DE102004001226A1 - Capacitive touch keyboard and double-click sensor for laptop computer has X-Y position sensors connected to computing and identification circuits with output to host system - Google Patents

Abstract

The computer keyboard assembly (2) has a capacitive keyboard (21) which may be operated by the touch of a finger (10). Two adjacent sides of the keyboard are connected to X (22) and Y (23) working circuits. These circuits are connected to a computer circuit (24) sending X and Y signals to a change sensing or differentiation circuit (25). The difference circuit output signals (D x, D y) enter an identification circuit (26). This checks if the sum of the first and second touches and the time interval between them is less than a reference time. The output of the identification circuit is transmitted to a host system (3) via an interface (27).

Description

TECHNICAL TERRITORY

The Invention relates to a method for identifying the double click, which is particularly applied to a tactile device. The invention relates a controller for carrying out this method.

The graphical user interface (GUI) was developed by PARC, used in conjunction with a pointing device (such as a mouse) which allows the user to easily perform the desired action. Therefore, this graphical user interface has a wide application on electronic digital devices, like desktop computer, notebook, PDA etc.

The Pointing device can mouse, trackball, touch pad, touch panel, or the like. The mouse has a mouse pointer on the mouse Screen. The user can move the mouse pointer to the mouse desired Lead the place and click on the mouse button, making the appropriate action accomplished becomes. Since a compact form is the trend of electronic digital devices, is used as a pointing device more and more a touch device (such Touch pad).

The Tasting device can be an optical, ohmic, electromagnetic, be inductive, acoustic or ultrasonic scanning device. Through this feeler The pointer can be on the screen with a finger or an object be moved. After the pointer is guided to the desired position, As with the mouse, the user can double click with the mouse Finger or an object to perform the selected action.

The conventional However, a method for identifying the double-click has one low precision on.

TASK OF THE INVENTION

Of the Invention is based on the object, a method and a controller to identify the double click, the identification double-click a high precision having.

Of the Invention is based on a further object, a method and to create a controller to identify the double-click the noise signals can be filtered off.

Of the Invention is based on a further object, a method and to create a controller to identify the double-click with the hand movements between double-clicking and dragging can be distinguished from each other.

The inventive method for identifying the double-click contains the following steps:
detect the first touch with the touch device,
detect the second touch with the touch device, and
checks whether the sum of the duration of the first touch, the duration of the second touch and the time interval between the first and second touch is less than a reference time.

If yes, a double-click signal can be generated.

SHORT DESCRIPTION THE DRAWINGS

1 shows the clock pulse of the conventional solution,

2 shows a block circuit of the invention,

3 shows the clock pulse of the invention,

4 shows a flow chart of the invention.

WAYS TO PERFORM THE INVENTION

The inventive method to identify the double-click is on a keying device applied. Hereinafter, the application of the invention to a capacitive sensing device described.

How out 2 can be seen comprises the capacitive sensing device 2 at least one touch plate 21 , an X-processing unit 22 , a Y-processing unit 23 , a unit of account 24 , a shift unit 25 , an identification unit 26 and a transmission interface 27 , The touch plate 21 has in the X and Y direction each a plurality of tracks, eg 16 tracks in the X direction and 12 tracks in the Y direction. If the finger 10 or an object the touch panel 21 touched or the touch panel 21 comes closer, the capacitance value of the touch panel 21 changed. The X and Y processing unit 22 . 23 process the capacity values in the X and Y directions and send them to the billing unit 24 , The unit of account 24 thereby computes the X and Y coordinate values of the touch location and sends these coordinate values to the shift unit 25 , The shift Ness 25 calculates the relative displacement Dx, Dy and sends this key signal Dx, Dy to the identification unit 26 , The key signal Dx, Dy is transmitted via a transmission interface 27 on a host system 3 transfer. The host system 3 can be a personal computer, notebook, PDA or mobile phone. Since the above structure is a known technique, it will not be described in detail here. The unit of account 24 , the shift unit 25 , the identification unit 26 and the transmission interface 27 are integrated in the invention in a chip controller.

The identification unit 26 checks whether the Dx, Dy key signal is a double-click. If so, generates the identification unit 26 a double click signal. This double-click signal is transmitted via the transmission interface 27 on the host system 3 so that the host system performs the appropriate action. The feature of the invention resides in the method of identifying the double-click identified by the identification unit 26 is used. This method can be realized by software or hardware. In the present embodiment, the identification unit 26 although in the controller of the probe 2 integrated, but can also be used as software or hardware in the host system 3 be installed.

In the present embodiment, a capacitive sensing device 2 used. However, the invention is not limited thereto. The touch device 2 may also be an optical, ohmic, electromagnetic, inductive, acoustic or ultrasonic scanning device.

In 4 a flow diagram of the invention is shown. If the finger 10 (or an object) on the touch panel 21 double clicks, captures the tactile device 2 in step 41 first the first touch. At the same time the identification unit starts 26 the time measurement for the first touch.

In step 42 checks the identification unit 26 whether the first touch ends and whether the measured value of the time measurement reaches the reference time T ₁ . In the present embodiment, the double-click within the reference time T _{1 is to be} terminated. This reference time T ₁ is in the range of 100 ms to 1000 ms (100 ms <T ₁ <1000 ms) and can be set as needed.

If the measurement of the time measurement reaches the reference time T ₁ and the first touch does not end, the hand movement is not identified as a double click. Then in step 43 Check if the touch is another hand movement.

When the movement ends and the measurement value of the time measurement does not yet reach the reference time T ₁ , in step 44 checked whether the second touch occurs and whether the measured value of the time measurement reaches the reference time T ₁ .

If the measurement of the time measurement reaches the reference time T ₁ and the second touch does not occur, the hand movement is not identified as a double click and the system thus returns to step 43 back.

If the second touch occurs and the measurement value of the time measurement does not yet reach the reference time T ₁ , the system enters the step 45 one.

How out 3 it can be seen, the identification unit 26 determine the time duration T _{down1 of} the first touch and the first time interval T _up1 between the first and second touch.

Because the touch plate 21 accidentally touched or affected by noise, the signals generated thereby must be filtered to increase the precision of the identification. Therefore, the tests are in the steps 45 . 46 . 48 and 49 carried out.

In step 45 it is checked whether the first time interval T _up1 between the first and second touch is greater than a first reference time T ₂₁ . The first reference time T ₂₁ gives the shortest time between the up (up) and the down (down) of the finger 10 and is in the range of 1 ms to 10 ms (1 ms ≤ T ₂₁ ≤ 10 ms). The range of the first reference time can also be set as needed. If the first time interval T _up1 between the first and second touch is greater than the first reference time T ₂₁ (T _up1 > T ₂₁ ), the signal is considered to be a useful signal and the system enters the step 46 one. If the first time interval T _up1 between the first and second touches is not greater than the first reference time T ₂₁ (T _{up1 ≦} T ₂₁ ), the signal is regarded as a noise signal and the system returns to step 42 back.

In step 46 It is checked whether the time period T _{down1 of} the first touch is greater than a reference time T ₃₁ for the first touch. The reference time T ₃₁ gives the shortest time of the first touch by the finger 10 in front. If the time T _{down1 of} the first touch is greater than the reference time T ₃₁ (T _down1 > T ₃₁ ), the signal is considered to be a useful signal and the system enters the step 47 one. If the time T _{down1 of} the first touch is not greater than the reference time T ₃₁ (T _{down1 ≦} T ₃₁ ), the signal is regarded as a noise signal, causing the system to step 41 returns and waits for the next first touch.

After detecting the first touch sets the identification unit 26 the timing continues and simultaneously performs with the help of the displacement unit 25 a calculation of the displacement M _{down2 of} the second touch by. In step 47 It is checked whether the second touch ends, whether the shift M _down2 the second touch is smaller than the reference shift M ₁ and whether the measured value of the time measurement reaches the reference time T ₁ .

When the second touch ends, the measurement value of the time measurement does not reach the reference time T ₁ and the displacement M _{down2 of} the second touch is smaller than the reference displacement (M _down2 <M ₁ ), it means that a double click occurs within the reference time T ₁ . Subsequently, in step 48 and 49 confirms whether the second touch actually ends and whether the second touch is a useful signal.

In step 48 a check is made as to whether the second time interval T _{up2 is} greater than a second reference time T ₂₂ . If so (T _up2 > T ₂₂ ), the ending of the second touch is considered true and the system enters the step 49 one. If no (T _{up2 ≦} T ₂₂ ), the second touch is regarded as a noise signal and the system returns to step 47 back, waiting for the second touch to end. In the present embodiment, the second reference time T ₂₂ may be selected the same as the first reference time T ₂₁ .

In step 49 it is checked whether the time duration T _{down2 of} the second touch is greater than a reference time T ₃₂ for the second touch. If the time duration T _{down2 of} the second touch is greater than the reference time T ₃₂ (T _down1 > T ₃₁ ), the second touch is considered to be a useful signal. That is, the sum of the time duration T _{down1 of} the first touch, the first time interval T _up1, and the time duration T _{down2 of} the second touch is less than the reference time T ₁ (T _down1 + T _down2 + T _up1 <T ₁ ) and the displacement M _down2 of the second touch second contact is less than the reference _displacement M ₁ (M _down2 <M ₁ ). Then the system enters the step 50 , If the time T _{down2 of} the second touch is not greater than the reference time T ₃₂ (T _{down1 ≦} T ₃₁ ), the second touch is regarded as a noise _signal , causing the system to step 44 returns and waits for the next second touch. In the present exemplary embodiment, the second reference time T ₃₂ can be selected the same as the first reference time T ₃₁ .

In step 50 generates the identification unit 26 a double-click signal via the transmission interface 27 on the host system 3 is transmitted. How out 3 it can be seen, the two signals 51 . 52 sent out together after identification.

When in step 47 the displacement M _{down2 of} the second touch is not smaller than the reference displacement M ₁ (M _down2 ≥ M ₁ ), it means that the hand movement may be a drag, causing the system to step 43 returns. In this way, it can be avoided to identify a drag as a double-click. In the present embodiment, the reference shift M _{1 is} in the range of 1 to 10 pixels (1 pixel ≦ M ₁ ≦ 10 pixels), e.g. 3 pixels, and can be adjusted as needed.

When in step 47 the measurement value of the time measurement reaches the reference time T ₁ before the second touch ends, it means that the sum of the time T _{down1 of} the first touch, the first time interval T _up1 and the time T _{down2 of} the second touch is not smaller than the reference time T ₁ (T _down1 + T _down2 + T _up1 ≥ T ₁ ). Therefore, the hand movement is not identified as a double click and thus the system returns to step 43 back.

In summary, it should be noted that the double-click must meet the following conditions: T down1 > T 31 Condition 1 T down2 > T 32 Condition 2 T up1 > T 21 Condition 3 T up2 > T 22 Condition 4 T down1 + T down2 + T up1 <T 1 Condition 5 M down2 <M 1 Condition 6

It should be noted that in the steps 42 . 44 . 47 several conditions are checked simultaneously. These conditions can also be checked one after the other.

In the invention, the sum of T _down1 , T _down2 and T _{up1 is compared} with the reference time T ₁ (condition 5). In addition, the reference values T ₃₁ (Condition 1), T ₃₂ (Operation 2), T ₂₁ (Condition 3) and T ₂₂ (Condition 4) are used to compare with the corresponding time courses, whereby the noise signals can be filtered out. Further, by comparing the displacement M _{down2 of} the second touch and the reference displacement M ₁ (condition 6), the hand movements between the double-clicking and dragging can be discriminated from each other.

The above description represents only a preferred embodiment of the invention and is not intended as a definition of the limits and the Be rich serve the invention. All equivalent changes and modifications are within the scope of this invention.

10

finger

2

sensing device

21

Touch plate

22

X-processing unit

23

Y processing unit

24

unit of account

25

shifter

26

identification unit

27

Transmission interface

3

host system

41-48

step

51 52

pulse

T _down1

time the first touch

T _down2

time the second touch

T _up1

time interval between the first and second Berüh

tion

M _down2

shift the second touch

up

Aufbewegung

down

down movement

Claims (21)

A method of identifying the double click, comprising the steps of: first contacting the touch device ( 2 ), the second touch with the touch device ( 2 ) and checks whether the sum of the time duration (T _down1 ) of the first touch, the time duration (Tdown ₁ ) of the second touch and the time interval (T _up1 ) between the first and second touch is less than a reference time (T ₁ ) ; if so, a double-click signal is generated. A method according to claim 1, characterized in that the double click signal can be generated when the displacement (M _down2 ) of the second touch is smaller than a reference displacement (M ₁ ). A method according to claim 1, characterized in that the double click signal can be generated when the time duration (T _down1 ) of the first touch is greater than a reference time (T ₃₁ ) for the first touch. A method according to claim 1, characterized in that the double click signal can be generated when the time duration (T _down2 ) of the second touch is greater than a reference time (T ₃₂ ) for the second touch. A method according to claim 1, characterized in that the double click signal can be generated when the first time interval (T _up1 ) between the first and second touch is greater than a first reference time (T ₂₁ ). The method of claim 1, 2, 3, 4 or 5, characterized in that the double click signal can be generated when the second time interval (T _up2 ) between the second touch and the following contact is greater than a second reference time (T ₂₂ ). Method according to Claim 1, characterized in that the double-click signal is sent to a host system ( 3 ) is transmitted. A controller for identifying the double-click, comprising: an accounting unit ( 24 ), which generates a tactile signal for each detected touch, and an identification unit ( 26 ) with the unit of account ( 24 ) and based on the key signal from the accounting unit ( 24 ) can identify the hand movement, wherein if the identification unit ( 26 ) a first and second key signal from the accounting unit ( 24 ) for a first and second touch, the sum of the time duration (T _down1 ) of the first touch, the duration (T _down1 ) of the second touch, and the time interval (T _up1 ) between the first and second touch is calculated and compared with the reference time (T ₁ ), wherein if the sum is smaller than the reference time (T ₁ ), the identification unit ( 26 ) generates a double click signal. Controller according to claim 8, characterized in that the key signals from the accounting unit ( 24 ) contains the displacement of the touch. Controller according to claim 9, characterized in that the identification unit ( 26 ) can generate a double-click _signal when the shift (M _down2 ) of the second touch is smaller than the reference shift (M ₁ ). Controller according to claim 8, characterized in that the identification unit ( 26 ) may generate a double-click _signal if the time duration (T _down1 ) of the first touch is greater than the reference time (T ₃₁ ) for the first touch. Controller according to claim 8, characterized in that the identification unit ( 26 ) may generate a double click _signal if the time duration (T _down2 ) of the second touch is greater than the reference time (T ₃₂ ) for the second touch. Controller according to claim 8, characterized in that the identification unit ( 26 ) one Double click _signal can generate when the first time interval (T _up1 ) between the first and second touch is greater than the first reference time (T ₂₁ ). Controller according to claim 8, 10, 11, 12 or 13, characterized in that the identification unit ( 26 ) can generate a double-click _signal if the second time interval (T _up2 ) between the second touch and the following touch is greater than the second reference time (T ₂₂ ). Controller according to claim 8, characterized in that the controller has a transmission interface ( 27 ) associated with the identification unit ( 26 ) and via which the double-click signal to the host system ( 3 ) can be transmitted. Identification unit for identifying the double-click, wherein if the identification unit ( 26 ) a first and second key signal from the accounting unit ( 24 ) for a first and second touch, the sum of the time duration (T _down1 ) of the first touch, the duration (T _down1 ) of the second touch, and the time interval (T _up1 ) between the first and second touch is calculated and compared with the reference time (T ₁ ), wherein if the sum is smaller than the reference time (T ₁ ), the identification unit ( 26 ) generates a double-click signal. Identification unit according to claim 16, characterized in that the identification unit ( 26 ) can generate a double-click _signal when the shift (M _down2 ) of the second touch is smaller than the reference shift (M ₁ ). Identification unit according to claim 16, characterized in that the identification unit ( 26 ) may generate a double-click _signal if the time duration (T _down1 ) of the first touch is greater than the reference time (T ₃₁ ) for the first touch. Identification unit according to claim 16, characterized in that the identification unit ( 26 ) may generate a double-click _signal if the time duration (T _down2 ) of the second touch is greater than the reference time (T ₃₁ ) for the second touch. Identification unit according to claim 16, characterized in that the identification unit ( 26 ) may generate a double-click _signal if the first time interval (T _up1 ) between the first and second touches is greater than the first reference time (T ₂₁ ). Identification unit according to claim 16, 17, 18, 19 or 20, characterized in that the identification unit ( 26 ) can generate a double-click _signal if the second time interval (T _up2 ) between the second touch and the following touch is greater than the second reference time (T ₂₂ ).