CN201583923U - Camera-type touch detection device - Google Patents
Camera-type touch detection device Download PDFInfo
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- CN201583923U CN201583923U CN2009201946212U CN200920194621U CN201583923U CN 201583923 U CN201583923 U CN 201583923U CN 2009201946212 U CN2009201946212 U CN 2009201946212U CN 200920194621 U CN200920194621 U CN 200920194621U CN 201583923 U CN201583923 U CN 201583923U
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Abstract
The utility model provides a camera-type touch detection device which comprises an image data acquisition module, an image screening module and an image data processing module, wherein the image data acquisition module is used for obtaining the original images taken on the screen from at least three preset positions out of the screen display area; the image screening module is used for selecting the image in the screen boundary from the original images; and the image data processing module is used for calculating the coordinate of the touching object according to the coordinates of the sheltered position of the screen boundary and the preset position when the screen boundary of the selected image is sheltered by the touching object. The camera-type touch detection device has low cost and easy realization, and can realize multi-point positioning.
Description
Technical field
The utility model relates to a kind of camera type touch detection device.
Background technology
Technology such as that the realization principle of common single-point touches detection technique is utilized is infrared, resistance, electric capacity and surface acoustic wave.Infrared and surface acoustic wave touch detection technical needs special signal to transmit and receive equipment, and resistance or capacitance touch detection technique then need to make special touch-screen, and its implementation is all complicated, and is convenient inadequately.Chinese patent application CN 200410077389.6 discloses a kind of technology of camera shooting type single-point touches screen.In the disclosed technical scheme of described patented claim, use the generation equipment of special-purpose light pen as the touch objects picture signal, camera obtains the touch objects image and then obtains the coordinate of touch objects.The implementation of the touch detection technical that described patented claim discloses is simpler, does not need special signal emission to be set, to receive equipment and touch-screen.But the touch detection technical that described patented claim discloses can only detect single touch objects, and can not be to the detection and location simultaneously of a plurality of touch objects.
The utility model content
Problem for the camera type touch detection device that solves prior art can only carry out detection and location to single touch objects provides a kind of camera type touch detection device that can position a plurality of touch objects simultaneously.
A kind of camera type touch detection device comprises: one is used to obtain at least three precalculated positions outside the on-screen display (osd) area to the image data acquisition module of the original image of described screen shot; An image screening module that is used for the image within the border of the selected described screen of described original image; And one be used for being touched thing when blocking when the border of described selected image screen, the image data processing module of the coordinate of the position that is blocked according to the border of described screen and the coordinate Calculation touch objects in described precalculated position.
Compared with prior art, in the camera type touch detection device of the present utility model, described image data processing module can position a plurality of touch objects simultaneously according to the coordinate of the coordinate Calculation touch objects in the position of the shielded image of the borderline touch objects of described screen and described precalculated position.Image within the border of described image screening module selected described screen from described original image, described image data processing module is only handled the image within the border of described screen, can get rid of the interference that the image change outside the bounds of described screen is brought, reduce the data volume of computing, accelerate locating speed.
Preferably, described screen comprises the boundary marker thing that is arranged on its edge, and described boundary marker thing is included in an extinction part and the non-extinction part perpendicular to mutual stacked setting on the direction of described screen; Described extinction part and non-extinction image partly are the image within the border of described screen to the image in described precalculated position.Because described boundary marker thing comprises described extinction part and described non-extinction part, therefore it is shown as one bright one dark striped when taking, be different from general environment for use and touch objects easily, the setting of described boundary marker thing makes the Boundary Recognition of screen more accurate, thereby the image within the selected border of selected described screen border is simplified the view data of subsequent treatment, accelerates the detection and location speed to touch objects.
Preferably, described camera type touch detection device further comprises three camera heads, be separately positioned on first limit of described screen and the intersection point place on two other limit, and the midpoint on described first limit, and its coverage all comprises whole described screen, described image data acquisition module is controlled described three camera heads, and described screen is taken, and obtains described original image.
Preferably, the shooting visual angle of camera head that is arranged on the intersection point place on first limit of described screen and two other limit all is 90 °, the angle on its camera lens optical axis and described first limit all is 45 °, the shooting visual angle of camera head that is arranged on the midpoint on described first limit is 170 ° to 180 °, and the angle on its camera lens optical axis and described first limit is 90 °.By the shooting angle setting of described three camera heads, make the image pickup scope of described three camera heads all comprise whole screen, guarantee the detection and location scope of touch objects is comprised whole described screen.
Preferably, in described selected image, the border of screen is touched thing when blocking, the position that described image data processing module is blocked according to the border of described screen and the coordinate in described precalculated position, calculate some straight lines, be judged as described touch article coordinate through the intersecting point coordinate of the straight line of three described precalculated position coordinates respectively three through the coordinate in each described precalculated position and the position that is blocked through the border of described screen respectively.Can simplify the touch point Coordinate Calculation respectively through the straight line of three described precalculated position coordinates and find the solution its intersection point and determine the touch point coordinate by defining three, improve detection and location speed.
Preferably, described camera type touch detection device comprises that further one is used for described screen is provided the sidelight source of illumination light, and described sidelight source is arranged on outside the described on-screen display (osd) area the same side with described at least three precalculated positions.By the illumination in described sidelight source, when environment is not enough excessively, also can photograph the image of pipeline abundance, strengthen the adaptability of described camera type touch detection device to environment for use.
Preferably, described camera type touch detection device comprises that further one is used for judging according to described original image the brightness value of surround lighting, and with the brightness value of described surround lighting and preset value relatively, the light source control module of opening or closing described sidelight source according to comparative result.By the control of described light source control module, when surround lighting is sufficient, close described sidelight source, save energy loss, when surround lighting is not enough, then open described sidelight source, can adjust the brightness in sidelight source automatically.
Preferably, described sidelight source is the wherein a kind of of fluorescent tube, LED or bulb.
Preferably, described sidelight source is a linear light source.
Preferably, described camera type touch detection device further comprises a coordinate according to the touch point, obtains the coordinate motion track of touch point, and carries out the Data Post module of predefined instruction according to the coordinate motion track of described touch point.By described Data Post module, the touch article coordinate that can further calculate according to detection and location carries out follow-up operation, as the location of mouse on the screen, move, and the dragging etc. of the screen display page.
Description of drawings
Fig. 1 is the structural representation of the utility model camera type touch detection device first embodiment;
Fig. 2 is the principle of work synoptic diagram of the utility model camera type touch detection device first embodiment;
Fig. 3 is the structural representation of a kind of preferred implementation of the utility model camera type touch detection device;
Fig. 4 is the principle of work synoptic diagram of the another kind of preferred implementation of the utility model camera type touch detection device;
Fig. 5 is the structural representation of the another kind of preferred implementation of the utility model camera type touch detection device.
Wherein, 101 boundary marker things;
110 screens;
121 first camera heads;
122 second camera heads;
123 the 3rd camera heads;
131 image data acquisition modules;
132 image data processing modules;
133 data memory modules;
134 light source control module;
135 images screening module;
140 Data Post modules;
151,152 sidelight sources.
Embodiment
See also Fig. 1 and Fig. 2, Fig. 1 is the structural representation of the utility model camera type touch detection device first embodiment, and Fig. 2 is the principle of work synoptic diagram of the utility model camera type touch detection device first embodiment.
Described camera type touch detection device comprises: the image data acquisition module 131 of the original image that at least three precalculated position that are used to obtain outside screen 110 viewing areas are taken described screen 110; An image screening module 135 that is used for the image within the border of the selected described screen 110 of described original image; One is used for being touched thing when blocking when the border of described selected image screen 110, the image data processing module 132 of the coordinate of the position that is blocked according to the border of described screen 110 and the coordinate Calculation touch objects in described precalculated position; And data memory module 133 that is used to store image data that described image data acquisition module 131 gathers and handles the coordinate data of the touch objects that the back obtains through described image data processing module 132.
Described at least three precalculated positions that described image data acquisition module 131 obtains original image are arranged on outside the viewing area of described screen 110, and its coordinate with respect to described screen 110 is known.
In the present embodiment, 131 three of the controls of described image data acquisition module are arranged on the camera head outside the viewing area of described screen 110, and described screen 110 is taken, and obtain described original image.The position of described three camera heads all is arranged on the top margin of described screen 110.Wherein, first camera head 121 and second camera head 122 are separately positioned on the top margin of described screen 110 and the intersection point place on other both sides, and the 3rd camera head 123 is arranged on the midpoint of described top margin.Wherein, the shooting visual angle of described first camera head 121 and described second camera head 122 all is 90 °, and the angle of the top margin of its camera lens optical axis and described screen is 45 °.The shooting visual angle of described the 3rd camera head 123 is 170 ° to 180 °, and the angle of the top margin of its camera lens optical axis and described screen is 90 °.The scope at the shooting visual angle of described three camera heads all comprises whole described screen 110.
Described the 3rd camera head 123 also can all be 90 ° camera head replacement with two shooting visual angles, at this moment, described two shooting visual angles are the midpoint that 90 ° camera head all is arranged on described top margin, and be used for separately half described screen 110 is taken, obtain described original image.So, then need not adopt expensive wide viewing angle camera head, also can reduce because the difficulty that the one-tenth distortion of image of camera head lens brings to Flame Image Process.
In practical operation, described at least three camera heads can select to install different optical filter or color filter according to the needs of environment for use.
As a kind of preferred implementation, described image data acquisition module 131 comprises that further one is used for the described original image that obtains is carried out the denoising point, increase the image processing module (figure does not show) that contrast is handled, to improve the quality of data of described image, make the detection and location of touch objects more accurate.
Described image data processing module 132 is used for the image within the bounds of the selected described screen 110 of described original image, in described selected image, the border of screen 110 is touched thing when blocking, the coordinate of the position that is blocked according to the border of described screen 110 and the coordinate Calculation touch objects in described precalculated position.
Owing to comprise the image within the bounds of described screen 110 in the described original image that obtains of described image data acquisition module 131, also comprise the image outside the bounds of described screen 110, yet, have only the image within the bounds of described screen 110 could reflect whether have touch objects to occur.When the image outside the bounds of described screen 110 changes, do not represent to have touch objects to touch described screen 110, if do not distinguished, then can be subjected to the influence of the image change outside the bounds of described screen 110 during the coordinate Calculation of touch objects, cause the location mistake easily, and invalid calculating increase can cause prolong the positioning time to touch objects.
Therefore, the image within the bounds of described image screening module 135 selected described screen 110 in described original image.Get rid of the interference that the image outside the bounds of described screen 110 changes the touch point detection and location are caused.Then, in the follow-up process that image is handled, the image within the border of a described screen 110 of need processing, and need not handle whole original image, shorten the time that image is handled.
In the present embodiment, described screen 110 comprises the boundary marker thing 101 that is arranged on its edge, and described boundary marker thing 101 can be provided with frame shape thing or the bar that plastics or aluminium alloy make in the outer rim of described screen 110 and realize.Described boundary marker thing 101 is included in perpendicular to an extinction part 104 of the stacked setting of direction of described screen 110 and a non-extinction part 102.Described extinction part 104 can adopt the mode at spraying of the surface of described frame shape thing or bar or stickup light absorbent to realize that described light absorbent can adopt black ink, flannelette, coating etc.Described extinction part 104 is used for absorption and shines its lip-deep light, and when therefore taking, the image of described extinction part 104 is shown as and is parallel to screen and darker long narrow striped.Described non-extinction part 102 can adopt in the spraying of the surface of described frame shape thing or bar or the mode of pasting non-light absorbent and realize that described non-light absorbent can adopt metal powder, sheet metal, aluminium foil, glass etc.Described non-extinction part 102 is used for reflected illumination to its lip-deep light, and when therefore taking, the image of described non-extinction part 102 is shown as and is parallel to screen and the higher long narrow striped of brightness.
In the present embodiment, described image screening module 135 is according to the image of boundary marker thing 101 described in the image of described shooting, promptly parallel with screen 110 an and stacked bright fringes and dark fringes mutually, selected described bright fringes and dark fringe are the image within the border of described screen 110 to the image in described precalculated position.
The extinction part 104 of described boundary marker thing 101 and the mutual alignment of non-extinction part 102 can freely be provided with, and promptly both described extinction part 104 can be arranged on the position away from screen 110, and described non-extinction part 102 is arranged on the position near screen 110; Also described non-extinction part 102 can be arranged on the position away from screen 110, described extinction part 104 is arranged on the position near screen 110.
Because described extinction part 104 and the stacked setting on the direction perpendicular to described screen 110 of described non-extinction part 102, the optical characteristics of described extinction part 104 and described non-extinction part 102 make described boundary marker thing 101 be difficult for obscuring with general environment for use or touch objects in described original image.
In the present embodiment, because on the top margin of described screen 110 described camera head is set, therefore, described top margin is not provided with described boundary marker thing 101, on other three limits of described screen 110, described boundary marker thing 101 is set all, indicates the border of described screen 110.
When bright fringes or dark fringe were not blocked described in the image within the bounds of described screen 110, representing did not have touch objects that it is made the action of touch on the described screen 110.Then described image screening module 135 continues the described original image that described image data acquisition module 131 obtains is selected, and judges in the described selected image touch objects whether occurs.
When bright fringes or dark fringe were blocked described in the image within the bounds of selected described screen 110, representing had touch objects that it is made the action of touch on the described screen 110.
Because described boundary marker thing 101 comprises described extinction part 104 and described non-extinction part 102, if touch objects can reflect ambient light, then speck appears in this dark fringe in the selected image of described image screening module 135; If it is less that the character of touch objects is reflect ambient light, then blackening can appear in bright fringes.Therefore, no matter whether touch objects can reflect ambient light, all more easily identifies, and makes described camera type touch detection device sensitiveer to the detection and location of touch objects.
In described selected image, the border of screen is touched thing when blocking, the coordinate of the position that described image data processing module 132 is blocked according to the border of described screen 110 and the coordinate Calculation touch objects in described precalculated position.
The coordinate data that described data memory module 133 is used to store the image data of described image data acquisition module 131 collections and handles the touch objects of back acquisition through described image data processing module 132.
In the present embodiment, described image data processing module 132 can adopt DSP or FPGA to realize, the described data memory module 133 preferred Flash of employing storeies are realized.
Specify described camera type touch detection device work principle below.
Before the work of described camera type touch detection device, described image data acquisition module 131 is at first calibrated the parameter of each camera head, mainly comprises the camera lens mechanical location adjustment of camera head, and surveyed area is demarcated, photographic images and actual angle error correction etc.
When described camera type touch detection device is worked, at first carry out the initialization of device, comprise that the parameter of each camera head and data collection and analysis module 130 is provided with initialization.The described a plurality of camera heads of described then image data acquisition module 131 controls are taken screen, obtain original image, described original image is carried out the denoising point, increase processing such as contrast, and described original image is sent to described data memory module 133 and described image screening module 135, described image screening module 135 is according to the image within the bounds of the selected described screen 110 in described original image of the boundary marker thing 101 in the original images that photograph.Show that in selected image described boundary marker thing 101 is blocked, when promptly described bright fringes or dark fringe were blocked, expression had touch objects to carry out touch action on described screen 110.
The position that described image data processing module 132 is blocked by described touch objects according to the border of described screen 110 and the coordinate in described precalculated position, calculate respectively through the coordinate in three described precalculated positions and pass through some straight lines of the image of described touch objects respectively, with two preliminary coordinate that are judged as touch objects respectively through the intersecting point coordinate of the straight line of described two precalculated position coordinates, shown in 4 of the A among Fig. 2, B, C, D.Then, described image data processing module 132 combines the preliminary coordinate of described touch objects with straight line through the 3rd precalculated position, if the principle of corresponding points on straight line determines that then the preliminary coordinate of described touch objects is the coordinate of actual touch thing, at 2 shown in the A among Fig. 2, B; Otherwise, with the preliminary coordinate of described touch objects for being judged as incorrect coordinate, shown in 2 of the C among Fig. 3, D.
See also Fig. 3, Fig. 3 is the structural representation of a kind of preferred implementation of the utility model camera type touch detection device.As a kind of preferred implementation, described camera type touch detection device can further comprise a Data Post module 140, described Data Post module 140 links to each other with described image data processing module 132, described Data Post module 140 is obtained the coordinate of the touch objects of continual renovation from described image data processing module 132, obtain the coordinate motion track of touch objects, carry out predefined instruction according to the coordinate motion track of described touch objects again, mouse moving for example, the dragging or the like of display page.The calculating of described touch article coordinate also can be carried out by described Data Post module 140.
See also Fig. 4, Fig. 5, Fig. 4 is the principle of work synoptic diagram of the another kind of preferred implementation of the utility model camera type touch detection device, and Fig. 5 is the structural representation of the another kind of preferred implementation of the utility model camera type touch detection device.As the another kind of preferred implementation of camera type touch detection device of the present utility model, described camera type touch detection device further comprises two sidelight sources 151,152.Described sidelight source 151,152 is used for providing photographic images required illumination light to described screen, it is arranged on outside the viewing area of screen 110, and be arranged on the same side with described three camera heads, maintain a certain distance with described a plurality of camera heads, the light of avoiding sending shines directly into the camera lens of described three camera heads.Described sidelight source 151,152 can be light-emitting components such as fluorescent tube, LED or bulb, and its shape can be a linear light source, also can be point source of light independently.
Described camera type touch detection device comprises that further is used for the brightness value that the original image that obtains according to described image data acquisition module 131 is judged surround lighting, and with the brightness value of described surround lighting and preset value relatively, the light source control module 134 of opening or closing described sidelight source 151,152 according to comparative result.If the brightness value of described surround lighting is lower than described predetermined value, then open described sidelight source 151,152, described screen 110 is thrown light on, make described image data acquisition module 131 get access to more distinct image; If the brightness value of image display environment light is higher than described predetermined value, then close described sidelight source 151,152, to utilize surround lighting fully, reduce energy loss.Described light source control module 134 further can also be provided with a plurality of brightness predetermined values, according to the brightness value of described surround lighting, controls described sidelight source 151,152 and sends the light of different brightness.For example, when the brightness of surround lighting is higher than one of them predetermined value, controls described sidelight source 151,152 and send predefined and light this predetermined value corresponding brightness.
Compared with prior art, in the camera type touch detection device of the present utility model, described image data processing module can position a plurality of touch objects simultaneously according to the coordinate to the coordinate Calculation touch objects in the image of described screen shot and described precalculated position.Image within the border of described image data processing module selected described screen from described original image, only handle the image within the border of described screen, can get rid of the interference that the image change outside the bounds of described screen is brought, reduce the data volume of computing, accelerate locating speed.Simultaneously, because described boundary marker thing comprises extinction part and non-extinction part, make it in described original image, be shown as stacked bright fringes and dark fringe, be different from general environment for use and touch objects apparent in viewly, and touch objects reflect ambient light whether no matter, the capital is blocked described bright fringes or dark fringe, so described camera type touch detection device is sensitiveer to the detection and location of touch objects.Described light source control module compares the brightness and the predetermined value of surround lighting, open or close described sidelight source according to comparative result, when surround lighting is enough, utilize surround lighting to take, when surround lighting is not enough, utilize described sidelight source to provide illumination, make the original image of shooting more clear described screen, more accurate to the location of touch objects.
Camera type touch detection device of the present utility model can be applied in the outside surface of any display device, is not subjected to the restriction of display device; Do not need environment for use is proposed higher requirement, and touch the precision height, extendability is strong, is easier to realize that the multiple point touching of large scale screen detects, and it is convenient that camera type touch detection device of the present utility model also has Installation and Debugging, the advantage that cost is low.
Use same principle, camera type touch detection device of the present utility model can carry out the multipoint positioning more than 3.In addition, by understanding the technical solution of the utility model, those skilled in the art will recognize, by increasing the number of different shooting angle or increase camera head, can make described camera type touch detection device of the present utility model more accurate, also can realize the multipoint positioning more than 3 more easily the location of touch objects.
Above-described the utility model embodiment does not constitute the qualification to the utility model protection domain.Any modification of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present utility model.
Claims (10)
1. camera type touch detection device is characterized in that comprising:
One is used to obtain at least three precalculated positions outside the on-screen display (osd) area to the image data acquisition module of the original image of described screen shot;
An image screening module that is used for the image within the border of the selected described screen of described original image; And
One is used for being touched thing when blocking when the border of described selected image screen, the image data processing module of the coordinate of the position that is blocked according to the border of described screen and the coordinate Calculation touch objects in described precalculated position.
2. camera type touch detection device as claimed in claim 1, it is characterized in that, described screen comprises the boundary marker thing that is arranged on its edge, and described boundary marker thing is included in an extinction part and the non-extinction part perpendicular to mutual stacked setting on the direction of described screen; Described extinction part and non-extinction image partly are the image within the border of described screen to the image in described precalculated position.
3. camera type touch detection device as claimed in claim 1, it is characterized in that: described camera type touch detection device further comprises three camera heads, be separately positioned on first limit of described screen and the intersection point place on two other limit, and the midpoint on described first limit, and its coverage all comprises whole described screen, described image data acquisition module is controlled described three camera heads, and described screen is taken, and obtains described original image.
4. camera type touch detection device as claimed in claim 3, it is characterized in that: the shooting visual angle of camera head that is arranged on the intersection point place on first limit of described screen and two other limit all is 90 °, the angle on its camera lens optical axis and described first limit all is 45 °, the shooting visual angle of camera head that is arranged on the midpoint on described first limit is 170 ° to 180 °, and the angle on its camera lens optical axis and described first limit is 90 °.
5. camera type touch detection device as claimed in claim 1, it is characterized in that: in described selected image, the border of screen is touched thing when blocking, the position that described image data processing module is blocked according to the border of described screen and the coordinate in described precalculated position, calculate some straight lines, be judged as described touch article coordinate through the intersecting point coordinate of the straight line of three described precalculated position coordinates respectively three through the coordinate in each described precalculated position and the position that is blocked through the border of described screen respectively.
6. as the described camera type touch detection device of arbitrary claim in the claim 1 to 5, it is characterized in that: described camera type touch detection device further comprises a sidelight source that is used for described screen is provided illumination light, and described sidelight source is arranged on outside the described on-screen display (osd) area the same side with described at least three precalculated positions.
7. camera type touch detection device as claimed in claim 6, it is characterized in that: described camera type touch detection device further comprises a brightness value that is used for judging according to described original image surround lighting, and with the brightness value of described surround lighting and preset value relatively, the light source control module of opening or closing described sidelight source according to comparative result.
8. camera type touch detection device as claimed in claim 6 is characterized in that: this sidelight source is the wherein a kind of of fluorescent tube, LED or bulb.
9. camera type touch detection device as claimed in claim 6 is characterized in that: this sidelight source is a linear light source.
10. as the described camera type touch detection device of arbitrary claim in the claim 1 to 5, it is characterized in that: described camera type touch detection device further comprises a coordinate according to the touch point, obtain the coordinate motion track of touch point, and carry out the Data Post module of predefined instruction according to the coordinate motion track of described touch point.
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| CN2009201946212U CN201583923U (en) | 2009-09-11 | 2009-09-11 | Camera-type touch detection device |
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| CN2009201946212U CN201583923U (en) | 2009-09-11 | 2009-09-11 | Camera-type touch detection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102364419A (en) * | 2011-10-08 | 2012-02-29 | 广东威创视讯科技股份有限公司 | Camera type touch control method and system thereof |
| CN102830852A (en) * | 2011-06-13 | 2012-12-19 | 联胜（中国）科技有限公司 | Touch device |
| CN103105978A (en) * | 2012-09-28 | 2013-05-15 | 友达光电股份有限公司 | Optical touch control panel and brightness control method thereof |
| TWI456461B (en) * | 2011-06-07 | 2014-10-11 | Wintek Corp | Touch-sensitive device |
-
2009
- 2009-09-11 CN CN2009201946212U patent/CN201583923U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI456461B (en) * | 2011-06-07 | 2014-10-11 | Wintek Corp | Touch-sensitive device |
| CN102830852A (en) * | 2011-06-13 | 2012-12-19 | 联胜（中国）科技有限公司 | Touch device |
| CN102364419A (en) * | 2011-10-08 | 2012-02-29 | 广东威创视讯科技股份有限公司 | Camera type touch control method and system thereof |
| CN102364419B (en) * | 2011-10-08 | 2014-07-23 | 广东威创视讯科技股份有限公司 | Camera type touch control method and system thereof |
| CN103105978A (en) * | 2012-09-28 | 2013-05-15 | 友达光电股份有限公司 | Optical touch control panel and brightness control method thereof |
| CN103105978B (en) * | 2012-09-28 | 2016-08-10 | 友达光电股份有限公司 | Optical touch control panel and brightness control method thereof |
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