CN201298220Y - Infrared reflection multipoint touching device based on LCD liquid crystal display screen - Google Patents
Infrared reflection multipoint touching device based on LCD liquid crystal display screen Download PDFInfo
- Publication number
- CN201298220Y CN201298220Y CNU2008202137831U CN200820213783U CN201298220Y CN 201298220 Y CN201298220 Y CN 201298220Y CN U2008202137831 U CNU2008202137831 U CN U2008202137831U CN 200820213783 U CN200820213783 U CN 200820213783U CN 201298220 Y CN201298220 Y CN 201298220Y
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Abstract
The utility model relates to an infrared reflection multipoint touching device based on LCD liquid crystal display screen, specifically to a multipoint touching device of liquid crystal screen, the display screen is an LCD display screen, a specified distance is arranged between the display screen and a backlight source, and a camera device is arranged between the display screen and the backlight source. The utility model uses the LCD as a display unit and can display the image clearly and vividly, and the service life thereof can be increased by 5 times. The screen display position cannot be adjusted. The LCD is in the size of 22-84 inches and can be spliced by multiple screens. A system can identify touch of objects without limitation in a reflective infrared imaging manner, and can identify the shape of the objects. The infrared lights are more uniform in an infrared backlight homogenisation manner, and the touch detection is more accurate and stable.
Description
Technical field
The utility model relates to a kind of touching device, be meant that more specifically a kind of display screen is a LCD display, be separated with specific distance between between display screen and the backlight, camera head is arranged on the LCDs multipoint touching device between display screen and the backlight again.
Background technology
Along with the progress of society and the maturation of infrared technique, infrared facility is simple in structure with it, control easily, plurality of advantages such as with low cost by wide model use in touch screen technology, particularly be used in the system of multiple point touching.
And its main type of existing Infrared touch screen systems has, echelette blocking type touch-screen, based on projection be subjected to press down in poly-total-reflection type multi-point touch system and based on the reflective multi-point touch system of projection.And wherein, the structure of echelette blocking type touch-screen is that a frame is installed around the display surface that is fit to, and by rule the infrared receiving/transmission diode pair is installed at frame, and corresponding frame transmitting-receiving diode is corresponding one by one; Infrared is to propagate on the surface of screen, and infrared-emitting diode emitted light beams is received by rectilinear direction or the infrared receiving diode that increases the opposite side frame of an oblique line directions.The course of work of echelette blocking type touch-screen is to adopt horizontal and vertical infrared scan radiation pattern to come the coordinate position of senses touch object, when finger or other object touch in screen surface, will be to the Infrared blocking-up of scanning emission, and cause infrared receiving diode not receive Infrared, and produce cut-off state; Judge the residing coordinate position of touch finger by horizontal and vertical intersection blocking state; By the blocking state of detection of straight lines direction and oblique line directions reception diode, and special algorithm, can detect the touch event of 1 to 2 finger simultaneously, realize so-called multi-touch function.But this multi-point touch panel belongs to pseudo-multiple point touching technology, is difficult to detect the object touch action more than 3, more can't realize the identification to body form, and screen splicing is realized difficulty in addition.
And based on Projection Display be subjected to press down in the structure of poly-total-reflection type multi-point touch system be that a special screen is arranged, a projection arrangement and an image collecting device are set in the back of screen; Screen is made up of the glass of high light-conductive rate, infrarede emitting diode, projection screen etc.; Infrarede emitting diode is placed on the side all around of leaded light glass regularly, infrared light is propagated at leaded light glass inner full-reflection, when there is finger touch on the surface of screen glass, the destroyed formation scattering of the light total reflection of touch place, bright spot will appear in the image that at this moment has the image production device collection of infrared fileter, and can determine the position coordinates of bright spot on screen.This method based on the infrared imaging production can detect any a plurality of finger touch on the screen.But the subject matter of the existence of this touch-screen is relatively difficulty of body form identification, owing to adopt projector equipment, the life-span of projection bulb is not long, needs regularly to change; Screen correction is cumbersome in addition, and the screen complex manufacturing technology is difficult for producing in batches.
At last, based on the infraluminescence parts of the infrared reflection multi-point touch system of Projection Display be not arranged on screen glass around, but infrared light supply is placed on the back side of screen.Screen has infrared characteristic, when screen surface has finger touch, reflection is just appearred in infrared light, and infrared eye will be produced the reflection bright spot, and the coordinate position of definite bright spot on screen.This mode also is based on the method for infrared image shooting, can detect the touch of a finger arbitrarily simultaneously, and can detect the body form that is placed on screen surface.But the mode of this employing projection exists the problem in projection bulb's life-span equally, and screen correction is cumbersome equally.
Summary of the invention
The utility model provides a kind of infrared external reflection multipoint touching device based on the LCD LCDs, and it adopts ripe LCD liquid crystal display is display device, simultaneously also as touch screen; Adopt infrared reflection to carry out the detection of touch event, to reach purposes such as multiple point touching, subject image identification, HD image demonstration and system's long-life.
To achieve these goals, the technical solution adopted in the utility model is: based on the infrared external reflection multipoint touching device of LCD LCDs, it comprises display screen, backlight and camera head, wherein, this display screen is a LCD display, this camera head is an infrared eye, further, be separated with specific distance between between this display screen and this backlight, and this camera head is arranged between this display screen and this backlight, again, this backlight comprises diffusion barrier from top to bottom successively, light guide plate, diffusion sheet and reflector plate, wherein, this diffusion sheet is arranged on this light guide plate bottom, and this diffusion sheet and this light guide plate are clamped between this diffusion barrier and this reflector plate, further, this backlight also comprises some infrared light supply bodies, this infrared light supply body is the LED infrared illuminator, again, some these infrared light supply bodies are arranged on around this light guide plate, again, some these infrared light supply bodies comprise some infrared LEDs and some visible light LED, and this infrared LED and this visible light LED are disposed on the aluminium base that PCB goes up and corresponding with this light guide plate.Again, this display screen is connected with drive plate, and this camera head is connected with image processor, and this drive plate and this image processor are connected with the PC main frame respectively.At last, this backlight is connected with constant-current supply, and this constant-current supply is supplied with for this backlight provides electric power.
Comprehensively above-mentioned, the utility model adopts rearmounted LED infrared light-emitting device as reflective infrared light supply, infrared LED and screen illumination imaging LED unification are made a backlight, the light homogenize that backlight sends LED, by diffusion barrier light is further atomized then, the illumination light that shines on the lcd screen and the degree of uniformity of infrared light are reached more than 85%.Backlight and lcd screen keep certain spacing, and an infrared eye is placed on the back side of screen, place 1,2 or 4 infrared eye according to the big I of used lcd screen size.Infrared camera has the infrared fileter of the same wavelength of infrared light that wavelength and infrared LED send, and shines and touches the reflection light that object produces to guarantee to shoot with video-corder the backlight infrared light.For the display brightness that guarantees LCD and the raising system resistivity to outside Infrared, the brightness of illumination of backlight and Infrared brightness will reach enough intensity.The LCD liquid crystal display connects a horizontal and vertical drive plate, drives strip video interface (VGA or DVI) interface, so that connect computer equipment.
Infrared eye is connected with the Flame Image Process parts by USB interface or video interface.
Event messages such as the touch coordinate that the Flame Image Process parts produce through Flame Image Process, shape sign are passed to the demonstration main control system.
Infrared image processing partly contains the software of Flame Image Process, and software module comprises: image acquisition, coordinates correction, ground unrest processing, image filtering, two-value threshold judgement, touch object reflected image search processing, touch coordinate calculating, body form judgement and coordinate and shape identification message data transfer etc.
The beneficial effects of the utility model are: the utility model is owing to adopted LCD to do display unit, can make the image of demonstration clear more bright-coloured, mission life prolongs more than 5 times, and screen display location need not to adjust, LCD can adopt 22～84 cun sizes, and can realize multi-screen splicing; Adopt reflective infrared imaging to make system's touch of recognition object without restriction, and the shape of recognizable object, adopt infrared backlight homogenize mode to make infrared light more even, it is more precise and stable to touch detection.
Description of drawings
Fig. 1 is a schematic diagram of the function of the present utility model;
Fig. 2 is the principle schematic of the utility model backlight;
Fig. 3 is the vertical view of the utility model backlight;
Fig. 4 is the utility model multi-point touch panel splicing synoptic diagram;
Fig. 5 is system works flow process figure of the present utility model.
Embodiment
Shown in Fig. 1 to 5, infrared external reflection multipoint touching device based on the LCD LCDs, it comprises display screen 10, backlight 20 and camera head 30, wherein, this display screen 10 is a LCD display, and this camera head 30 is an infrared eye, further, be separated with specific distance A between between this display screen 10 and this backlight 20, and this camera head 30 is arranged between this display screen 10 and this backlight 20.
Again, this backlight 20 comprises diffusion barrier 21, light guide plate 22, diffusion sheet 23 and reflector plate 24 from top to bottom successively as shown in Figures 1 to 3, wherein, this diffusion sheet 23 is arranged on these light guide plate 22 bottoms, and this diffusion sheet 23 and this light guide plate 22 are clamped between this diffusion barrier 21 and this reflector plate 24.
Further, this backlight 20 also comprises some infrared light supply bodies 25, and this infrared light supply body 25 is the LED infrared illuminator, and again, some these infrared light supply bodies 25 are arranged on around this light guide plate 22.
Again, some these infrared light supply bodies 25 comprise some infrared LEDs 251 and some visible light LED252, and this infrared LED 251 and this visible light LED252 are disposed on the aluminium base that PCB goes up and corresponding with this light guide plate 22.
Again, this display screen 10 is connected with drive plate 40, and this camera head 30 is connected with image processor 50, and this drive plate 40 and this image processor 50 are connected with the PC main frame respectively.
At last, this backlight 20 is connected with constant-current supply 60, and this constant-current supply 60 is supplied with for this backlight 20 provides electric power.
As shown in Figure 1, this LCD liquid crystal display and this backlight 20 and this camera head 30 separately certain distance are placed, and can produce the infrared external reflection image to guarantee this camera head 30, and this backlight 20 can not block this camera head 30 and below being placed on.The drive plate 40 of this LCD is placed on the side, links to each other with this PC main frame by video interface (VGA, DVI or other video interface) interface, is shown by the host computer control lcd screen.Visible light and infrared light LED that this backlight 20 adopts high brightness guarantee the display brightness after backlight leaves LCD; Display lighting LED is powered by the constant-current supply of special use, and the constant current size that provides can be provided control light intensity; Infraluminescence LED also has special-purpose constant-current supply power supply.The constant current source electric current is 350mA, and a plurality of LED are connected in series.The Flame Image Process parts adopt Embedded System Design, realization is searched for functions such as processing, touch coordinate calculating, body form judgement to the collection, touch coordinate correction, ground unrest processing, image filtering, two-value threshold judgement, the touch object reflected image that touch infrared image, and gives the demonstration main frame with touch coordinate and shape identification message data transfer.
As shown in Figure 2, schematic diagram for this backlight 20, LED provides light source, and light enters this light guide plate 22 and changes radiation direction and distribution, injects this diffusion sheet 23, this diffusion sheet 23 has a lot of little grids, the feature of its structure is: wanting littler near the grid of LED lamp, wanting big from LED lamp distant place grid, grid plays the effect of diffusion optically focused, big its diffusion optically focused of grid is obvious more, and little its diffusion optically focused of grid is weak more.This reflector plate 24 has high reflectance, will reflect back by the light of grid.Like this pointolite is diffused into area source, further light is spread through this diffusion barrier 21, its net result is that equalizing light rays is distributed.
As shown in Figure 3, be that the distribution of light guide plate LED luminotron is provided with figure.This infrared light LED251 and visible light LED252 alternately place, and are placed on the both sides of this light guide plate 22 equably.When the stronger light intensity of needs, place LED by same rule around can this light guide plate 22.LED adopts 1W/350mA high brightness luminescent pipe, is welded on the aluminium base PCB with good heat dispersion, and more large-area heat dissipation metal body is installed at the aluminium base back side, to guarantee that LED works under lower temperature, in order to avoid damage LED, prolongs the LED mission life.P.e.c. on the PCB is connected visible light respectively with infrared light LED, and power supply respectively, makes the electric current that flows through visible light LED adjustable, so that make the LCD display brightness reach suitable degree.
As shown in Figure 4, be multi-point touch panel splicing synoptic diagram of the present utility model.The Flame Image Process parts of touch system are directly passed to a demonstration main control system with the coordinate and the shape identification information of touch event when having only single touch system to work, perhaps camera is directly linked to each other with the PC main frame, touch image processing function and realize by host software.When a plurality of touch apparatus splice, the output of the Flame Image Process parts of each unit all is connected to an internal network devices, by internal network information such as the touch-control coordinate of each touch unit, shape sign, element number, timestamp is passed to display control program in real time and shows control.Concatenation unit quantity can be 2xN or 1xN, and the screen size of the size of each unit can be 22～84 cun, adopts 16:9 DID LCD screen.The border width of DID is depended in the slit of splicing.
As shown in Figure 5, be system works flow process figure of the present utility model.Lcd screen is shone in host computer control LCD display frame, infrared light all the time, when finger or other object touch screen, infrared external reflection takes place; Infrared image acquisition is to view data; At first each frame image data that collects is carried out the background image noise processed, cut ground unrest; Carry out image filtering then, remove the picture noise point by the level and smooth algorithm of average, intermediate value or gaussian filtering; Carry out two-value judgement again, get between 0～255 numeral one rationally numeral be the judgement threshold values, getting this brightness value when pixel brightness value during greater than this threshold values is 255, when pixel brightness value during less than this threshold values, getting this brightness value is 0; Carry out the search of reflected image then, full frame bianry image " bright spot group " or " bright spot figure " are searched for, when searching target, calculate the centre coordinate of " bright spot group " or the shape and the centre coordinate of figure; Data such as coordinate figure, pattern identification, coordinate motion direction, timestamp are formed into columns into message pass to display control section; Display control section carries out the demonstration control of corresponding next picture according to touch-control message.
Claims (4)
1. based on the infrared external reflection multipoint touching device of LCD LCDs, it comprises display screen, backlight and camera head, it is characterized in that: this display screen is a LCD display, this camera head is an infrared eye, further, be separated with specific distance between between this display screen and this backlight, and this camera head is arranged between this display screen and this backlight, again, this display screen is connected with drive plate, and this camera head is connected with image processor, this drive plate and this image processor are connected with the PC main frame respectively, at last, this backlight is connected with constant-current supply, and this constant-current supply is supplied with for this backlight provides electric power.
2. the infrared external reflection multipoint touching device based on the LCD LCDs as claimed in claim 1, it is characterized in that: this backlight comprises diffusion barrier, light guide plate, diffusion sheet and reflector plate from top to bottom successively, wherein, this diffusion sheet is arranged on this light guide plate bottom, and this diffusion sheet and this light guide plate are clamped between this diffusion barrier and this reflector plate.
3. the infrared external reflection multipoint touching device based on the LCD LCDs as claimed in claim 2, it is characterized in that: this backlight also comprises some infrared light supply bodies, this infrared light supply body is the LED infrared illuminator, and again, some these infrared light supply bodies are arranged on around this light guide plate.
4. the infrared external reflection multipoint touching device based on the LCD LCDs as claimed in claim 3, it is characterized in that: some these infrared light supply bodies comprise some infrared LEDs and some visible light LED, and this infrared LED and this visible light LED are disposed on the aluminium base that PCB goes up and corresponding with this light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202137831U CN201298220Y (en) | 2008-11-26 | 2008-11-26 | Infrared reflection multipoint touching device based on LCD liquid crystal display screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008202137831U CN201298220Y (en) | 2008-11-26 | 2008-11-26 | Infrared reflection multipoint touching device based on LCD liquid crystal display screen |
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| CN201298220Y true CN201298220Y (en) | 2009-08-26 |
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| CNU2008202137831U Expired - Lifetime CN201298220Y (en) | 2008-11-26 | 2008-11-26 | Infrared reflection multipoint touching device based on LCD liquid crystal display screen |
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