US20030067447A1 - Touch screen with selective touch sources - Google Patents
Touch screen with selective touch sources Download PDFInfo
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- US20030067447A1 US20030067447A1 US10/052,695 US5269502A US2003067447A1 US 20030067447 A1 US20030067447 A1 US 20030067447A1 US 5269502 A US5269502 A US 5269502A US 2003067447 A1 US2003067447 A1 US 2003067447A1
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- touch
- touch sensor
- contact point
- user
- switch
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K11/00—Methods or arrangements for graph-reading or for converting the pattern of mechanical parameters, e.g. force or presence, into electrical signal
- G06K11/06—Devices for converting the position of a manually-operated writing or tracing member into an electrical signal
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0444—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
Definitions
- Electrodes 220 are bonded to and electrically connected with conductive surface 213 . Electrodes 220 serve two purposes: first, they connect the conductive surface to amplifiers 222 through wires 224 ; and second, the electrodes are arranged around the edge of conductive surface 213 in a pattern that distributes the current flowing in the conductive surface in a linear, orthogonal flow.
- the construction of capacitive sensors in electrode patterns is known to those skilled in the art, as disclosed in U.S. Pat. Nos. 4,198,539 and 4,371,746, both to Pepper, Jr.
- Processor 216 may send position information to a CPU 242 for further processing.
- Typical magnitudes of electrical parameters for the touch systems described above, using features of touch system 400 as examples, are: for voltage 427 , about 1 to 30 V peak-to-peak at 10 kHz to 200 kHz; for voltage 454 , about 1 to 30 V peak-to-peak at 10 kHz to 200 kHz; for voltage 464 , 1 to 30 V peak to peak at 10 kHz to 200 kHz; for touch capacitance 430 , about 100 to 2000 pf; and for body-to-ground impedance 436 , about 50 to 2000 pf with a resistance typically less than about 100 ⁇ if a user makes direct electrical contact with ground 438 .
- Body impedance 434 is typically in the range of about 20 to 300 k ⁇ .
- signal modifiers 452 and 466 may adjust the phase relationship of voltages 454 and 464 relative to voltage 427 and current measuring devices 428 , 450 and 462 may make phase sensitive current measuring devices.
- An alternative to using different voltage phases as a way to distinguish between voltage signals is to use voltage signal frequencies (as mentioned throughout). If frequencies were used for this purpose, frequency adjusters would replace phase shifters and current measuring devices would make frequency sensitive current measurements rather than phase sensitive current measurements.
Abstract
A touch system for determining the position of a touch on a touch sensor includes a touch sensor and a user contact point separate from the touch sensor. Information from both the user contact point and a touch to the touch sensor is used to determine the position of the touch on a touch sensor. Multiple contact points or touch sensors may be incorporated into the touch system. The touch system may be configured to selectively activate the touch sensors and contact points and distinguish between information generated from the touch sensor and contact point.
Description
- This application claims the benefit of U.S. Provisional Application No. 60/304,007 filed Jul. 9, 2001, which is hereby incorporated in its entirety.
- This invention relates to a touch screen or touch digitizer with selective touch sources. The invention more particularly relates to a touch system that utilizes information from a touch sensor and a contact point in order to determine the position of a touch to the touch sensor.
- Touch screens are capable of measuring touch position for a single touched point. Current touch screens are unable to effectively determine the position of touches by multiple users, discriminate among touches by multiple users, or enable the touch of one user while disabling the touch of another, especially when simultaneous touch down occurs. A number of touch screen applications would benefit from the ability to determine the position of multiple touches to a touch screen, discriminate among touches by multiple users and to enable touches by one user and not another.
- Infrared and surface acoustic wave touch screen systems have the ability to locate two separate simultaneous touches in two of four possible locations, but they are unable to resolve the locations uniquely due to “shadow” effect. A capacitive touch system with the ability to discriminate between human touch and the simultaneous use of an inanimate object (a stylus) is disclosed in U.S. Pat. No. 5,365,461 by Stein et al. The system is an improvement of the definite capacitive disclosures in U.S. Pat. Nos. 4,371,746, 4,293,734, 4,198,539, and 4,071,691 to Pepper, Jr. These capacitive systems lack the ability to measure coordinates of two simultaneous human touches because the current flowing through the touch screen from each touch are combined, and the measured result indicates an average of two touch locations. A touch system addressing disadvantages of known touch systems and their components would be an important advance in the art.
- Generally, the present invention relates to a touch system that utilizes a touch screen or touch digitizer with selected touch sources. One embodiment of the invention is a touch system for determining the position of a touch on a touch sensor and a user contact point separate from the touch sensor. The system determines the position of a touch on the touch sensor by utilizing information from both the user contact point and the touch to the touch sensor.
- A method for determining a position of a touch on a touch sensor according to the present invention includes collecting information from a contact point that is separate from the touch sensor, collecting information from the touch sensor, and determining the position of the touch on the touch sensor using information from both the contact point and the touch sensor.
- The above summary of the present invention is not intended to describe each disclosed embodiment or every implementation of the present invention. The Figures and the detailed description that follow more particularly exemplify these embodiments.
- The invention may be more completely understood in consideration of the following detailed description of various embodiments of the invention in connection with the accompanying drawings, wherein like numerals represent like parts throughout several views, in which:
- FIG. 1 is a schematic diagram including the primary features of a touch system, according to the invention;
- FIG. 2 is a schematic diagram including the features of an alternative embodiment of a touch system, according to the invention;
- FIG. 3 is a schematic drawing of a touch system of the prior art;
- FIG. 4 is a schematic circuit representation of a touch system of the prior art;
- FIG. 5 is a schematic drawing of a touch system, according to the invention;
- FIG. 6 is a schematic circuit representation of the touch system of FIGS. 1 and 5, according to the invention;
- FIG. 7 is a detailed representation of the touch system embodiment of FIG. 2, according to the invention;
- FIG. 8 is a schematic circuit representation of the touch system of FIGS. 2 and 7, according to the invention;
- FIG. 9 is a perspective view of a touch system according to the invention where the touch sensor and contact point are mounted on the same substrate.
- While the invention is amenable to various modifications in alternative forms, the specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the invention of the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
- The present invention is generally applicable to touch screens or touch digitizers with selective touch sources. The invention is particularly related to a touch system having a touch sensor and a user contact point, where the system utilizes information from both the user contact point and a touch to the touch sensor to determine a location of a touch to the touch sensor. The invention may be particularly suited for use with a capacitive touch system where both the touch sensor and the user contact point are touched, which may additionally create enhanced performance of the touch system. The present invention may also be particularly suited for use in, for example, an electronic game system designed to be played by one or more players where, in the course of playing the game, players can apply touch input to generate a response in the game.
- In a touch system, the location of a touch applied by a user is generally determined by measuring separate signals generated by a touch input to the system, and comparing the signals, or ratios of the signals, to calculate the position of the touch. The touch data then may be, for example, correlated to a particular action or instruction. Assuming a properly calibrated touch system, the calculated position of a touch should be sufficiently close to the actual touch location to be used for a particular action or instruction as a reported touch location. What qualifies as “sufficiently close” is determined in part by the resolution of the touch system. As used herein, reporting a touch location refers to the calculated touch location being used by the touch system in an appropriate manner, for example, by the application software, to determine the user input instructions. Reporting might include communications from a touch system processor to a central processing unit (CPU), or in a more integrated system can simply entail touch position data being calculated and appropriately used as contemplated by the application.
- A “touch” to the touch sensor or to the contact point may include an actual physical touch, or may be defined as a proximity touch, wherein a touch signal is generated in the touch sensor or the contact point when a user or object is positioned sufficiently close to generate a signal.
- As used herein, “information” related to a contact point and a touch sensor that is used to determine a position of a touch to the touch sensor may include several distinguishing characteristics and includes any suitable measurable or detectable parameter, quantity or property. For example, “information” may include the magnitude, frequency, or phase of a touch signal from a “touch” to the touch sensor or to the contact point. The “information” may also relate to the timing of touch down and lift off from a touch sensor or contact point or whether or not a “touch” is in an active or inactive area of a touch screen or contact surface for a given function of the touch system. Fundamentally, the “information” may include whether or not any “touch” has been made to a particular touch sensor or contact point.
- Now referring to the schematic diagram of FIG. 1, one example of a touch system10 of the present invention includes a
touch sensor 12, acontact point 14, aprocessor 16 and apower source 18. The lines connecting these elements represent communication between the elements, for example through wires.Touch sensor 12 may be an infrared touch sensor, a force touch sensor (i.e., one that determines a touch position by measuring flex, strain, and/or displacement due to the force of a touch), a resistive touch sensor, a surface acoustic wave (SAW) touch sensor, a capacitive touch sensor or the like. The touch sensor may be transparent to allow interaction with an image, or it may be non-transparent as in the case of touch pads and digitizers. A capacitive touch system may include atouch sensor 12 that has a conductive surface, typically made by applying transparent Indium Tin Oxide (ITO) or Tin Antimony Oxide (TAO) onto a glass substrate. The conductive surface is then typically overcoated with a dielectric material.Touch sensor 12 may, in the alternative, be configured as a multiple electrode near field imaging (NFI) capacitive system or an X-Y array, such as is used in a through-glass discrete button, as an alternative to the current sensing capacitive system described with reference to FIGS. 3-9 below. -
Contact point 14 may be configured to be activated by a touch, typically from a user.Contact point 14 may be a touch sensor, proximity sensor, or other device or object that may receive input or other means for generating a touch signal in the touch system.Contact point 14 may take the form of an object whose function is apparent to the user, or may take a form that is less visible to the user and/or less apparent as to its functionality in the touch sensor system.Contact point 14 is typically electrically connected to the touch system and may be positioned in the touch system at a separate location from thetouch sensor 12. Whencontact point 14 andtouch sensor 12 are physically separated, it may be easy to distinguish between touch signals generated by each contact point and the touch sensor. Physical separation of these components may also be advantageous for certain applications of the present invention, such as a multi-user game. - An example of
positioning contact point 14 andtouch sensor 12 at separate locations from each other includes placing the contact point in one housing and placing the touch sensor in a separate housing. In this arrangement, the contact point and touch sensor may still be electrically connected to each other and to the touch system with, for example, a wire or cord. In a second example,contact point 14 andtouch sensor 12 are each positioned within the same housing, but are physically separated from each other in a way that they do not share the same substrate. In this second example, the contact point and touch sensor may also be electrically connected to each other and to the touch system. -
Contact point 14, in an alternative embodiment, may be positioned on the same surface, screen, conductive surface, or the like astouch sensor 12. According to this alternative embodiment,contact point 14 would be at a location ontouch sensor 12 that is permanently or temporarily inactive for the purposes of generating a response in the system due to a touch input at that location, but would create a touch signal that is unique to the contact point. As a result, a touch signal fromcontact point 14 can be distinguished from a touch signal fromtouch sensor 12 even though they are both positioned on the same surface or screen. Thus, information from the area of the contact point may be used to determine a position of a touch to an active area of the touch sensor and/or to determine a system instruction due to the reported touch. For example, touching the contact point area may provide “enhancement” of the touch signal generated by touching the touch sensor so that a threshold signal is attained for the system (for example, necessary for a given function of the system), or that a signal-to-noise ratio of the system is increased so that the system may more accurately determine the position of a touch to the touch sensor. One means of distinguishing between touches to touchsensor 12 andcontact point 14 in this alternative embodiment would be to require that either the touch down events or the lift off events from the touch sensor and contact point are timed separately. As a result, the system may be able to determine which touch signal was generated first, determine the general position of each of those touches (for example, within or outside an “active” area set aside for the touch sensor), and subtracting the touch signal from either the touch sensor or the contact point from the total touch signal generated in the system in order to accomplish an objective of the touch system. - Touch system10 may also include a
processor 16 that is electrically connected to touchsensor 12 andcontact point 14.Processor 16 may gather information fromtouch sensor 12 andcontact point 14.Processor 16 may be able to distinguish the identity of the signals, the magnitude of the signals, the timing of the signals being created, as well as other information related totouch sensor 12 andcontact point 14.Processor 16 may then process the information as gathered and generate an output, for example, instructions or a particular action for the touch system. - Touch system10 may also include a
power source 18 that provides power to the system.Power source 18 may typically be a voltage source, the output from which being at a level that correlates with the requirements of the touch system. - In another embodiment of the invention,
touch system 100 includes atouch sensor 112, afirst contact point 114, asecond contact point 115, aprocessor 116 and apower source 118, as shown in the schematic diagram of FIG. 2.Touch sensor 112 is configured to receive a touch that generates a touch signal.Touch sensor 112 may be one of a variety of touch sensor, such as a touch sensor for force, infrared, resistive, surface acoustic wave, or capacitive touch system technology. Contact points 114 and 115 may be activated by a touch that generates a touch signal in the touch system. Contact points 114 and 115 are typically electrically connected to touchsystem 100 and the system may be able to distinguish between touches to the contact points.Touch system 100 may also includeprocessor 116 that gathers information from thetouch sensor 112 andcontact points sensor 112 cannot be determined until at least one or both of contact points 114 and 115 are also activated.Processor 116 is able to identify, measure the magnitude of, and determine the sequential order of information fromtouch sensor 112 andcontact points point 114 and a touch by a user B to contactpoint 115 by uniquely driving each user through their respective contact point.Touch system 100 may be powered by apower source 118 that “drives”touch sensor 112 and/orcontact points - A
capacitive touch system 200 is illustrated in the schematic drawing of FIG. 3.Touch system 200 includestouch sensor 212,processor 216,power source 218,conductive surface 213 ontouch sensor 212,electrodes 220,amplifiers 222, andwires 224 that connect the amplifiers to thetouch sensor 212.Touch system 200 also includescurrent measuring devices 228 that measure currents 226 fromtouch sensor 212,voltage 227,capacitance 230 between the user and thetouch sensor 212,ground 232,body impendence 234 from a user, body-to-ground impedance 236,earth ground 238,system impedance 240, and central processing unit (CPU) 242. An approximate circuit representation including some components oftouch system 200 is included as FIG. 4. - Typically,
electrodes 220 are bonded to and electrically connected withconductive surface 213.Electrodes 220 serve two purposes: first, they connect the conductive surface toamplifiers 222 throughwires 224; and second, the electrodes are arranged around the edge ofconductive surface 213 in a pattern that distributes the current flowing in the conductive surface in a linear, orthogonal flow. The construction of capacitive sensors in electrode patterns is known to those skilled in the art, as disclosed in U.S. Pat. Nos. 4,198,539 and 4,371,746, both to Pepper, Jr. -
System 200 also includespower source 218 that produces a time varying signal v(t). This signal may be a sign wave, square wave, or any time varying voltage.Amplifiers 222 drive the signal to each of the corners ofconductive surface 213 throughwires 224. The voltage v(t) is driven from the output of each ofamplifiers 222, so the entire surface oftouch sensor 212 is at a uniform voltage.Current measuring devices 228 measure currents 226 that flow through the amplifier outputs. Whenconductive surface 213 is touched by, for example, a finger, capacitive contact is made and is represented bycapacitor 230. Current flows fromground 232, throughamplifiers 222,conductive surface 213,touch capacitor 230, and fromearth ground 238 throughsystem impedance 240 back tolocal ground 232. Currents measured bydevices 228 are converted into digital format andprocessor 216 calculates a position of a touch to touchsensor 212 using ratios of the current 226 generated from a touch to touchsensor 212.Processor 216 may send position information to aCPU 242 for further processing. - If the
touch system 200 is connected directly to a grounded wall outlet,impedance 240 may be close to zero. If thetouch system 200 is within a small device, such as a battery-powered device with an insulating plastic case,impedance 240 may be very high, which will limit the current flow. Limited current flow in this situation also limits performance and sensitivity oftouch system 200. - One embodiment of a capacitive touch system is the
touch system 300 shown in the schematic drawing of FIG. 5 and generally described with regard to FIG. 1.Capacitive touch system 300 includestouch sensor 312,contact point 314,processor 316,power source 318,conductive surface 313 oftouch sensor 312, andelectrodes 320 electrically coupled totouch sensor 312.Touch system 300 also includesamplifiers 322,wires 324 connectingamplifiers 322 to touchsensor 312,system currents 326,voltage 327 frompower source 318,current measuring devices 328,touch capacitance 330,local ground 332,body impedance 334, body-to-ground impedance 336,earth ground 338,system impedance 340 andCPU 342.Touch system 300 further includes several features different from the prior art, includingtouch sensor switch 344,contact point switch 346,amplifier 348 forcontact point 314,current detector 350,signal adjuster 352,contact point voltage 354, contact point current 356, andcontact point capacitance 358.Switches touch sensor 314 make it possible fortouch system 300 to function in several modes, whereastouch system 200 can function in only one mode. In a first mode,touch system 300 functions in the same way as prior artcapacitive touch system 200. However, in alternative user-selectable modes,touch system 300 is able to overcome many of the shortcomings found in prior art touch systems.Touch system 300 also includesamplifier 348 that drivestouch pad 314, and output current 356 fromcontact point 314 is measured bycurrent measuring device 350. - As discussed above, a “touch” to touch
sensor 312 orcontact point 314, as referred throughout this application, may include an actual physical touch, such as by a user's finger or another object held by the user, or may be defined as a “proximity” touch that creates a touch signal within the circuit without actually physically touching the touch sensor or contact point.Contact point 314 may be designed as a button, a mouse, a joystick, a glove, a switch or other device that may be “activated” by user contact or proximity in order to create a “touch” signal that may be processed byprocessor 316. - Table 1 indicates some possible operating modes of the
touch system 300 of FIG. 5. Modes of operation 1-3 depend on the state ofswitches voltages current detectors processor 316 and byCPU 342. In an alternative embodiment, the modes of operation may depend on the frequency or the phase ofvoltage current detectors TABLE 1 Touch System with Touch Sensor and One Contact Point Circuit configuration (refer to FIG. 5) Switch Switch 344 346 Sensor Sensitivity Phase Phase and Responsiveness of 328 of 350 (refer to FIG. 5) What is Phase Phase Touch Sensor Contact Point Mode Powered of 327 of 354 312 314 1 Contact Open Closed Any Touch Must also Point 314 270° 90° touch Contact DC 0° Point 3122 Touch Closed Open Must also Any Touch Sensor 90° 270° touch Contact 312 0° DC Point 314 3 Touch Closed Closed Any touch; Any touch; Sensor 90° 270° (More (More 312 and 0° 180° sensitive if sensitive if Contact Contact Point Touch Sensor Point 314 is also 312 is also 314 touched) touched) - In a first mode of touch system300 (mode 1), any touch to touch
sensor 312 is detected and located, and a touch to contactpoint 314 is detected only iftouch sensor 312 is also being touched or a touch signal fromsensor 312 has been generated.Switch 344 has been closed so thattime varying voltage 327 frompower source 318 is connected toamplifiers 322, which may be unity gain amplifiers.Touch sensor 312 is driven with thetime varying voltage 327 such that a touch toconductive surface 313 will cause current 326 to flow throughtouch sensor 312,touch capacitance 330 to the body of theuser touching surface 313,body impedance 334, body-to-ground impedance 336,earth ground 338,system impedance 340,local ground 332, and back toamplifiers 322. Touch sensor current 326 and contact point current 356 are measured bycurrent measuring devices -
Processor 316 collects information fromcurrent measuring devices sensor 312 based on the ratio ofcurrents 326.Current measurements 326 and 356 are used to detect touches to contactpoint 314 andtouch sensor 312.Current measurements 326 and 356 may also be used by aprocessor 316 to determine the sequence of touches to touchsensor 312 andcontact point 314, the duration of those touches, the magnitude of those touches, and other information that might be useful for activating or providing instructions totouch system 300 for a user utilizingtouch system 300. The system may also be configured to continuously measure the position of signals fromtouch sensor 312 andcontact point 314 in order to determine the time of touch down or lift off. In this configuration, it is possible forcontact point 314 to be included on the same sensor astouch sensor 312, so long as the signal generated by thecontact point 314 is different or distinguishable from the signal oftouch sensor 312. -
Touch system 300 may also include a phase orfrequency shifter 352 that adjusts the relationship ofvoltage 354 relative tovoltage 327, while maintaining a constant waveform ofvoltage 327. Typically, the phase ofvoltage 354 is set to be distinguishable fromvoltage 327 by a certain amount in order to maximize the net voltage betweentouch sensor 312 andcontact point 314, for example, by 180°. Table 1 includes examples of various phase shifts in a typical phase setting according to the invention.Signal adjuster 352 may also change the magnitude ofvoltage 354 relative tovoltage 327.Amplifiers Current measuring devices currents 326 and 356. - The detection phases of
devices devices 328 are typically set to detect capacitively coupled current from the source (touch sensor 312) to ground (ground 332). Touch current is largely capacitively coupled, and is typically shifted fromvoltage 327 by 60° to 80°. The phase difference can be as little as 30° in cases whereimpedance device 350 is set to [voltage 327+270°].Device 350 detects capacitively coupled current flowing fromtouch sensor 312 to contactpoint 314. In alternative embodiments implementing a frequency sensitive circuit, various standard increments in the magnitude of the voltage frequency may be used to distinguish the signals generated bytouch sensor 312 andcontact surface 314. - In a second mode of touch system300 (mode 2), a touch to contact
point 314 is detected, and a touch to touchsensor 312 is then detected.Switch 346 is closed in this mode so thatvoltage 354 is conveyed throughamplifier 348 to contactpoint 314.Switch 344 is open so thatamplifiers 322 are not powered byvoltage 327, thus allowingtouch sensor 312 to have a zero time-varying signal. As a result, a touch to touchsensor 312 while not touchingcontact point 314 results in no measurable signal and no touch is detected bysystem 300.Signal adjuster 352 may modify the voltage phase or voltage frequency ofvoltage 354 so that the phase or voltage is distinct from the phase or voltage ofvoltage 327. Preferably, in a phase sensitive circuit, the phase ofcurrent measuring devices 322 is set at 90°. - When
contact point 314 is touched, current 356 flows fromlocal ground 332, throughamplifier 348,contact point 314,touch capacitance 358, and through the user'sbody impedance 334. Current 356 may follow two separate paths after passing throughbody impedance 334. If the user touches onlycontact point 314, then current 340 flows through the user's body-to-ground impedance 336, toearth ground 338,system impedance 340, and back tolocal ground 332. Current 356 resulting from the touch to contactpoint 314 is measured bycurrent measuring device 350. This measurement is conveyed toprocessor 316 that is configured to detect a touch to contactpoint 314 based on the change of current 356.Processor 316 may convey this change in current toCPU 342, andCPU 342 may use this information to trigger changes in a program, change the image on a display, or give other instructions that might be required for proper use and function oftouch system 300. For example, a touch to contactpoint 314 may indicate that one user oftouch system 300, for example in a video game scenario, is ready to play the video game. In response,CPU 342 may change an indicator on the display from red to green to indicate that the user is now able to participate. - If the user touches
contact point 314 andtouch sensor 312 simultaneously, or if there are overlapping touches, a portion of current 340 also flows from the user's body, throughtouch capacitance 330 to touchsensor 312. Current 340 is distributed toamplifiers 322 based on the touch location to touchsensor 312, and then flows back tolocal ground 332. As current 340 passes throughamplifiers 322, it will be measured bycurrent measuring devices 328, and the measurements will subsequently be conveyed toprocessor 316. Thus, a touch to touchsensor 312 can be detected and then the position of that touch measured, only if the user is simultaneously touchingcontact point 314 andtouch sensor 312. It is noted, however, that a path for return of the current provided by touchingcontact point 314 andtouch sensor 312 may increase the current being channeled throughtouch sensor 312. As such, the higher amount of current may increase the amount of signal being sent toprocessor 314 while the amount of “noise” in the system remains constant. As a result, the signal-to-noise ratio of the current measurements and the resulting position measurements may be increased. - In a third mode of the touch system (mode 3),
touch sensor 312 andcontact point 314 are both driven with voltage signals, preferably by closingswitches sensor 312 alone may be detected and measured, as will a touch toonly contact point 314.Signal adjuster 352 may adjust the phase or frequency ofvoltage 354 to be distinguishable fromvoltage 327. In the case of a phase sensitive touch system,voltage 354 is preferably out of phase withvoltage 327 by 180°. - A benefit of mode 3 is improved signal-to-noise ratio for touch signals on
touch sensor 312, if a user simultaneously touches or is in proximity withcontact point 314. Signal-to-noise ratios are affected in at least two ways. First, touching acontact point 314 while touchingtouch sensor 312 provides a local ground path for touch current, as illustrated in the schematic circuit drawing of FIG. 6. Second, in addition to touch current flowing fromtouch capacitance 330, through a user'sbody impedance 334 intoearth ground 338, and throughsystem impedance 340 tolocal ground 332, current may also flow fromsensor capacitance 330, through a user'sbody impedance 334, throughcontact point capacitance 358,amplifier 348 and intolocal ground 332. Accordingly, a higher signal is provided to touchsensor 312, and the sensitivity oftouch sensor 312 is enhanced. Sensitivity oftouch sensor 312 is enhanced in part whenearth ground 338 is bypassed when a user is touching bothcontact point 314 andtouch sensor 312, whenvoltage 354 is passed throughcontact point 314 and the user to touchsensor 312, or a combination of these effects onsystem 300. This is especially true wheresystem impedance 340 is high, as in the case with ungrounded battery operated equipment, causing a high percentage of current 340 to pass throughtouch sensor 312 rather than back tosystem ground 332. - An alternative embodiment of the touch system of the present invention illustrated in FIG. 2 is described in further detail according to the more detailed schematic drawing of
touch system 400 illustrated in FIG. 7.Touch system 400 is a capacitive touch system that operates with many of the same features and functions as the touch system of FIG. 5. Like features are described with the same reference numbers. In addition to the features of FIG. 5,touch system 400 further includes anadditional contact point 415,amplifier 460,current measuring device 462, contactpoint touch capacitance 464,signal modifier 466, contact points switch 468, contact point current 470 and contact point voltage 472. An approximate circuit representation including some components of the touch system of FIG. 7 is illustrated in FIG. 8. -
Touch system 400 may operate in any of several user-selectable modes that overcome the technology limitations found in prior art systems. Some of the details related to a capacitive touch system oftouch system 400 are presented in Table 2.TABLE 2 Operating Modes for Touch System with Touch Sensor and Two Contact Points Circuit configuration (refer to FIG. 7) Switch Switch Switch 444 446 468 Sensor Sensitivity and Phase of Phase of Phase of Responsiveness 428 450 462 (refer to FIG. 7) What is Phase of Phase of Phase of Sensor Mode Powered 427 454 464 11a Pad 52 Pad 53 1 Touch Closed Open Open Any Must Must Sensor 41290° 270° 270° touch touch touch 0° DC DC Touch Touch Sensor Sensor 412 412 2 Contact Open Closed Open Must Any Must Point 414 90° 270° 90° touch touch touch 0° 180° DC Contact Contact Point 414 Point 4143 Contact Open Open Closed Must Must Any touch Point 415 90° 90° 270° touch touch 0° DC 180° Contact Contact Point 415 Point 4154 Contact Open Closed Closed Must Any touch Any touch Points 414 270° & 270° 180° touch and 415 180° Contact 0° 180° 90° Point or 415 5 Touch Closed Closed Closed Any touch Any touch Any touch Sensor 412 90° 270° 270° and Contact 0° 180° 180° Points and 415 - In a first mode of touch system400 (mode 1),
touch system 400 operates in the same way as prior art capacitive touch screens, such astouch system 200. According to this mode,switch 444 is closed and switches 446 and 468 are left open. As a result,touch sensor 412 is activated by a touch andprocessor 416 is able to determine the location of a touch to touch sensor 412 (see mode 1 oftouch system 300 for further details). - In a second mode of touch system400 (mode 2), similar to mode 2 of
touch system 300,switch 446 is closed and switches 444 and 468 are open. A touch to contactpoint 415 ortouch sensor 412 can be detected and measured only if the user is simultaneously touching or creates an overlapping touch withcontact point 414.Switch 446 is closed so thatvoltage 454 is conveyed throughamplifier 448 to contactpoint 414.Switches amplifiers touch sensor 412 andcontact point 415 have zero time-varying signal. As a result, a touch to touchsensor 412 orcontact point 415 while not touchingcontact point 414, results in no measurable signal and no touch to touchsensor 412 is detected.Signal modifier 452 modifies the phase or frequency ofvoltage 454 so thatvoltage 454 is distinguishable fromvoltages current measuring devices - If the user of
touch system 400 simultaneously touches contact points 415 and 414 andtouch sensor 412, a portion of current 456 may flow from the user's body, throughtouch capacitance 430 to touchsensor 412, toamplifiers 422 and back tolocal ground 432, or current 456 may flow throughtouch capacitance 464 ofcontact point 415, throughamplifier 460 and back tolocal ground 432. As current 456 flows through either ofamplifiers current measuring device processor 416. Thus, as a touch ontouch sensor 412 orcontact point 415 may be detected and measured only if the user is simultaneously touchingcontact point 414. It is noted that a return path for the current provided by touchingcontact point 414 andtouch sensor 412 orcontact point 415 will generally increase the current being measured and thus increase the signal-to-noise ratio of the current measurements and the resulting signal collected by the processor. This is especially true whereimpedance 440 is high. - In a third mode of touch system400 (mode 3) that is similar to mode 2,
contact point 415 is activated or made available for activation by closingswitch 468. A touch oncontact point 414 or ontouch sensor 412 can be detected and measured only if the user is simultaneously touchingcontact point 415. A touch to contactpoint 415 can also be detected independent of touchingcontact point 414 ortouch sensor 412. In mode 3, switches 444 and 446 are open so thatamplifiers touch sensor 412 andcontact point 414, have DC signals. As a result, a touch toonly touch sensor 412 orcontact point 414 while not touchingcontact point 415 results in no measurable signal and no touch is detected. Whenswitch 468 is closed,voltage 464 is conveyed throughamplifier 460 to contactpoint 415, and current 470 is measured bycurrent measuring device 462. - In one embodiment of
touch system 400, two users can use the touch system simultaneously ifprocessor 416 is programmed to switch or toggle rapidly between modes 2 and 3. If a first user touchescontact point 414 continuously and a second user touchescontact point 415 continuously, the touch coordinates of each user touchingtouch sensor 412 can be measured because the signals generated by each user ontouch sensor 412 are distinguishable from each other. According to this embodiment,processor 416 first configures switches 444, 446 and 468 to mode 2, activatingcontact point 414 with a signal equal tovoltage 454. The presence of the first user is detected by current change throughcontact point 414, resulting fromcapacitive contact 458 with the first user. When the first user touchestouch sensor 412, a connection withvoltage 454 viaamplifier 448 to contactpoint 414 causes current 456 to flow through the first user's body and intotouch sensor 412. The position of the first user is measured from the distribution of current throughelectrodes 420,current measuring devices 428 andamplifiers 422. If the second user is touchingtouch sensor 412 during this time, the capacitive coupling of the second user's body will have a negligible effect on currents 456 flowing from the first user intotouch sensor 412, because the current from the first user's body generates negligible voltage on the surface oftouch sensor 412. After measuring the first user's position,processor 416 changes or toggles from mode 2 to mode 3, thus deactivatingcontact point 414 and activatingcontact point 415 withvoltage signal 464. The presence of the second user is detected by a current change throughcontact point 415 that results from capacitive contact with the second user. When the second user touchestouch sensor 412, a connection withvoltage 464 viaamplifier 460 to contactpoint 415, causes current 470 to flow through the second user's body and intotouch sensor 412. The touch by the second user to touchsensor 412 is measured from the distribution of current intouch sensor 412. Measuring both the first and second user's position by switching or toggling from mode 2 to mode 3 and from mode 3 to mode 2 can be repeated at a rapid rate of, for example, 5 milliseconds per mode. This will result in the perception of simultaneous detection, even in situations where touch down and lift off are rapid by human standards. While this embodiment shows a useful two-user device with twocontact points - In addition to the sequenced multi-user system as described above, current flowing from one contact point to another contact point can be used as an indication of a unique condition. If, for example, two users are touching their respect contact points in a given application, such as a two person competitive video game, and a first user touches a second user, current will flow from one contact point through the first user's body, the second user's body, and into the contact point of the second user. At any given point in the above example, one contact point has voltage applied to it so that it can provide a current when the user associated with that pad touches the touch screen, while the other contact point is inactive with no voltage and should have no current flow. If current for a given pad is detected in the inactive pad, it is an indication that the two users are touching one another. This can be used in a game or other application as an “interference” or “foul” indicator.
- Another example of an application of the present invention is with automobile navigation systems. Automobile navigation systems may have touch screens that use the principles of modes 2 and 3. Automotive manufacturers have begun using video displays with touch screens on navigation systems where the system interface may be too complex for buttons and dials alone. Navigation system may also be too complex to use while actively driving the vehicle. One solution is to disable the driver's touches from registering on the navigation system while the car is in motion, but allow a passenger to use the navigation system at any time. It may also be desirable to allow any passenger to use the navigation system, or only the passenger sitting in one of the front seats. Disabling a touch of one or more passengers from registering on the navigation system may be accomplished by implanting contact points or similar sensors in one or more of the vehicle seats. When a user creates a touch signal in the contact point by sitting in or being proximate to a seat, the touch system will react according to the system's program settings to allow or disallow touches from that user to register on the navigation system.
- In a fourth mode of touch system400 (mode 4), that is similar to modes 2 and 3, both contact points 414 and 415 are activated, preferably by closing
switches touch sensor 412 can be detected and measured only if the user is simultaneously touching or has activatedcontact point touch sensor 412. A touch to contactpoint touch sensor 412. In mode 4,switch 444 is open so thatamplifiers 422 andtouch sensor 412 have DC voltage signal at their outputs and no signal is generated by a touch to touchsensor 412.Switches contact point amplifiers point 414 will couplevoltage 454 oncontact point 414 to the user'sbody impedance 434 throughtouch capacitance 458, causing current 456 to flow through current measuring device 450,contact point 414,coupling capacitance 458, the user'sbody impedance 434, body-to-ground impedance 436,system impedance 440,local ground 432, andamplifiers 422 as the current flows back totouch sensor 412.Processor 416 measures the change in current 456 and determines if the change in current is above a defined threshold or meets specified signal requirements. If defined requirements are met, a touch to contactpoint 414 is registered and may be communicated fromprocessor 416 toCPU 442. - Mode 4 has an important difference from other modes of
touch system 400 in thatcurrent measurement circuits 428 may each use a phase sensitive or frequency sensitive demodulator that measures two separate phases or frequencies, for example, phases that are 90° apart. Also, signalmodifiers voltages sensitive demodulator 428 may detect currents resulting from a user touchingcontact point touch sensor 412. With these phase or frequency settings,current measuring devices 428 are able to yield simultaneous detection of touches to contactpoints sensor 412. - In fifth mode of touch system400 (mode 5),
touch sensor 412 andcontact points switches sensor 412 alone may be detected and measured, as will a touch toonly contact points Signal modifiers voltages voltage 427, for example, by 180° out of phase withvoltage 427 and 90° out of phase with each other. - A benefit of mode 5 is improved signal-to-noise ratio for touch signals generated on
touch sensor 412, if the user simultaneously touches contact points 414 or 415. Signal-to-noise ratios are affected in at least two ways: first, touching acontact point touch sensor 412 provides a local ground path for touch current (as illustrated in the schematic circuit of FIG. 8); and second, in addition to touch current flowing fromtouch capacitance 430, through a user'sbody impedance 434, intoearth ground 438,system impedance 440, body-to-ground impedance 436, andlocal ground 432, current may also flow fromtouch capacitance 430, through a user'sbody impedance 434, contactpoint touch capacitance amplifier local ground 432. - Another embodiment is where the contact point is adjacent to, and still separate from, the sensor. One example is a touch system500 that includes a
touch sensor 512 and conductive contact points 414 and 415 constructed onto asingle substrate 590 that is coated on its top surface with conductive material, as illustrated in FIG. 9. Alinearization pattern 592 of conductive material, such as silver frit or conductive ink, is printed around the border oftouch sensor 512.Wires 524 andelectrodes 520 may connect topattern 592 at the four corners oftouch sensor 512. Drive amplifiers, such asamplifiers 422 illustrated in FIG. 7, may be used to powerconductive surface 513 oftouch sensor 512. Contact points 514 and 515 may connect to drive amplifiers, such asamplifiers wires conductive electrodes touch sensor 512 are electrically isolated from each other byisolation lines Isolation lines substrate 590 or by other methods such as laser ablation. - In another embodiment of a capacitive touch system, such as
touch system 400, a second touch sensor may replace one or both of contact points 414 and 415. In this embodiment, the system may be operated in the same or similar modes assystem 300. However, a second or more additional touch sensors would each require multiple amplifiers and electrodes such asamplifiers 422 andelectrodes 420 with associatedcurrent measuring devices 428 in order to measure and determine a touch to each of those additional touch sensors. An additional touch sensor in a touch system may be used for many purposes, for example, to replace a “mouse” used to operate the system where the location of a touch on the additional touch sensor conveys a right or left mouse button activation or a sliding touch on the additional touch sensor may perform the same or similar function of a mouse scroll. Such a touch system may be configured so that the primary touch sensor, the additional touch sensor, or both or neither touch sensors are functional only when these touch sensors are activated or when an additional contact point is also simultaneously activated. - Contact points may have conductive surfaces or may comprise conductive or resistive materials that are insulated from direct touch by a dielectric material, as is common practice with capacitive touch sensors. To “touch” a contact point, it is only necessary that capacitive contact be made between a user or an object and the conductive material of the contact point, either by physical touching or by proximity touching. It would be possible, for example in a capacitive touch system, to implement contact points into a table by installing conductive foil pads under a surface laminate such as Formica. If the user rests an arm on or close to the table over the foil pad, there would typically be sufficient signal coupled capacitively to the user for detection of the user and for injection of measurable current into a touch sensor or contact point. Alternatively, contact points may be made with a foil sheet or conductive mesh screen that may be placed into or under the fabric of a seat such as an automobile seat (as described above with regard to automobile navigation systems). In another exemplary application, contact points may be made with a foil sheet or conductive plate embedded in the housing of a hand-held personal digital assistant (PDA). A hand-held device such as a PDA is not grounded except for a battery ground, creating a capacitive touch circuit with high impedance. Therefore, powering the touch surface of the PDA through a separate touch pad (the embedded conductive material) may reduce the system impedance, particularly if the contact point is separately powered. An advantage of this embodiment of the invention is that when a touch sensor is powered by simultaneously touching of a contact point or an additional touch sensor, the additional current source provided by the simultaneous touching improves the sensitivity of the system, even if there is only one user involved.
- In addition to sensing the presence of a user, a touch on a touch sensor may be selectively enabled. Also, in applications such as the automobile seat or the table where contact points are insulated from the user by a dielectric material, it is advantageous to drive a contact point with the highest feasible voltage so that the touch current is maximized. Contact points may be driven with high voltage while touch sensor drivers use low voltage, or vice versa.
- Typical magnitudes of electrical parameters for the touch systems described above, using features of
touch system 400 as examples, are: forvoltage 427, about 1 to 30 V peak-to-peak at 10 kHz to 200 kHz; forvoltage 454, about 1 to 30 V peak-to-peak at 10 kHz to 200 kHz; forvoltage 464, 1 to 30 V peak to peak at 10 kHz to 200 kHz; fortouch capacitance 430, about 100 to 2000 pf; and for body-to-ground impedance 436, about 50 to 2000 pf with a resistance typically less than about 100 Ω if a user makes direct electrical contact withground 438.Body impedance 434 is typically in the range of about 20 to 300 kΩ.Touch sensor 412 has a surface resistance of about 300 to 3000 Ω/□ (ohms per square) having a surface resistance between any two corners of the touch sensor of about 50 to 500 Ω. Output impedance ofamplifiers System impedance 440 may be about 1 to 10,000 pf for an isolated touch system.System impedance 440 may have resistance less than 0.001 Ω if the touch system is electrically connected to ground. - Many embodiments of the present invention have several practical uses within the field of computer-related games. For example, touch pads may be integrated into a game user's seat, arm rest, joystick, mouse, or the like or be activated by pressing a -button or series of buttons that are mounted separately or integrated into the game console or other furniture associated with the game. A computer game may utilize an analog touch digitizer and at least one touch pad where activation of the pad indicates that the user is ready to play or wants to take a time out. A computer game with “foul” detection, as described above, may include indicating when players are touching each other or performing actions that violate game rules, such as users taking turns at touching the touch sensor in a particular order.
- As applied to games, the invention may require that the user or users play a game with only one hand because a second hand must maintain contact with a contact point. This feature would help reduce the number of hands that are touching a touch sensor during the course of a game, thus reducing obstructions to view of the touch sensor such as when a touch sensor is integrated into a viewable screen. The invention may also be used to measure the amount of time a user is touching the touch sensor in comparison to the amount of time the touch sensor is available for touching due to activation of a contact point. This feature could be a performance indicator or a method of determining the payment amount in a pay-for-use computer game. The invention may also allow for the computer game to display the amount of time the user is “in play” or otherwise available to register a touch to the touch sensor because of simultaneously touching a contact point. For example, a border or background of a computer game screen may change from red to green when a user is “in play” and may be able to indicate when each of several players is “in play.”
- As further applied to games, one embodiment of the invention may be configured to allow for playing a team game, for example, each player may have a contact point but only one player is activated at a time to register a touch to the touch sensor. Activation of a different player may be done after an activate player completes a portion of the game, possibly on a fixed time basis or at random times without prior notice. In an alternative team game, each team may include only one contact point and the contact point must be momentarily untouched as players on the same team alternate being “in play.”The game may be configured so that all the members of a team may be touching the same or different contact points before any player is “in play.”
- Throughout the above detailed description of the present invention, emphasis has been placed on utilizing various voltage phases and phase changes to fulfill the objectives of the invention. For example, signal
modifiers voltages voltage 427 andcurrent measuring devices - Where frequency is used to distinguish between signals, it is possible that passing multiple frequencies across a touch sensor may result in a buildup of current in some form on the touch sensor. Such a current buildup can be reduced by filtering off excess current from the touch sensor with a filter, as may be common in the art.
- Although the specific features of the invention are shown in some drawings and not in others, this is for convenience only as features may be combined with any or all of the other features in accordance with the invention. The words “including,” “comprising,” “having,” and “with” as used herein are to be interpreted broadly and comprehensively and are not limited to any physical interconnection. Moreover, any embodiments disclosed in the subject application are not to be taken as the only possible embodiments.
- Other embodiments will occur to those skilled in the art and are within the following claims.
Claims (18)
1. A system for determining the position of a touch on a touch sensor comprising a first user contact point separate from the touch sensor, wherein information from both the first user contact point and the touch on the touch sensor is used to determine the position of the touch on the touch sensor.
2. The system of claim 1 wherein a user touches both the touch sensor and the first user contact point.
3. The system of claim 1 further comprising a touch sensor switch electrically connected to the touch sensor, a user contact point switch electrically connected to the first user contact point, and a power source, wherein the touch sensor switch and the user contact point switch are further electrically connected to the power source.
4. The system of claim 3 , wherein the touch sensor switch or the user contact point switch must be closed in order for the system to determine a position of a touch to the touch sensor.
5. The system of claim 1 further comprising a second user contact point separate from the touch sensor.
6. The system of claim 5 wherein the first and second contact points are uniquely driven so that touches from different users associated with each contact point can be distinguished.
7. The system of claim 1 wherein the first user contact point and the touch sensor are mounted in a single touch system housing.
8. The system of claim 1 wherein the first user contact point is driven with a guard signal that reduces noise in the system.
9. The system of claim 1 wherein the first user contact point must be touched in order for the touch system to determine the position of a touch to the touch sensor.
10. The touch system of claim 5 wherein the system further includes a second user contact point switch electrically coupled to the second user contact point, wherein the combination of the first and second user contact point switches and the touch sensor switch being open and closed defines system modes.
11. A method for determining a position of a touch on a touch sensor, comprising:
collecting information from a first contact point, the first contact point being separate from the touch sensor;
collecting information from the touch on the touch sensor; and
determining the position of the touch on the touch sensor using information from both the first contact point and the touch sensor.
12. The method of claim 11 wherein a touch sensor switch is associated with the touch sensor and first contact switch is associated with the first contact point.
13. The method of claim 11 further comprising a second contact point.
14. The method of claim 13 wherein a second contact switch is associated with the second contact point, wherein in a first mode the touch sensor switch is closed and the first and second contact switches are open, wherein in a second mode the first contact switch is closed and the touch sensor switch and the second contact switch are open, wherein in a third mode the second contact switch is closed and the touch sensor switch and first contact switch are open, wherein in a fourth mode the first and second contact switches are closed and the touch sensor switch is open, and wherein in a fifth mode the touch sensor switch and the first and second contact switches are closed.
15. The method of claim 13 further comprising the step of discriminating among touch inputs to the touch sensor based on whether or not one of the contact points has been touched.
16. The method of claim 15 wherein completing the circuit includes bypassing a ground.
17. The method of claim 13 wherein determining the position of the touch includes measuring and reporting the location of the touch to the touch sensor to a processor.
18. The method of claim 11 wherein the touch sensor is a capacitive touch sensor and a sensitivity of the touch sensor is enhanced by completing a circuit that comprises a user and the touch sensor and does not include a ground.
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KR1020047000236A KR100908942B1 (en) | 2001-07-09 | 2002-06-24 | Touch screen with optional touch source |
DE60237083T DE60237083D1 (en) | 2001-07-09 | 2002-06-24 | TOUCH-SENSITIVE SCREEN WITH SELECTIVE TOUCH SOURCES |
AT02744578T ATE475146T1 (en) | 2001-07-09 | 2002-06-24 | TOUCH SENSITIVE SCREEN WITH SELECTIVE TOUCH SOURCES |
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JP2003512915A JP4167174B2 (en) | 2001-07-09 | 2002-06-24 | Touch screen with selective touch source |
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JP2005328325A JP4413183B2 (en) | 2001-07-09 | 2005-11-14 | Vehicle touch screen device and control method thereof |
US12/254,339 US8159472B2 (en) | 2001-07-09 | 2008-10-20 | Touch screen with selective touch sources |
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WO2003007227A3 (en) | 2003-10-30 |
DE60237083D1 (en) | 2010-09-02 |
ATE475146T1 (en) | 2010-08-15 |
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US8159472B2 (en) | 2012-04-17 |
WO2003007227A2 (en) | 2003-01-23 |
KR100908942B1 (en) | 2009-07-22 |
EP1405253A2 (en) | 2004-04-07 |
CN1290050C (en) | 2006-12-13 |
EP1405253B1 (en) | 2010-07-21 |
US20060022959A1 (en) | 2006-02-02 |
CN1529869A (en) | 2004-09-15 |
KR20040015335A (en) | 2004-02-18 |
US7453444B2 (en) | 2008-11-18 |
JP2006117242A (en) | 2006-05-11 |
TWI223201B (en) | 2004-11-01 |
JP2004535026A (en) | 2004-11-18 |
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CA2452339A1 (en) | 2003-01-23 |
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