CN102236478B - Optical touch display device - Google Patents
Optical touch display device Download PDFInfo
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- CN102236478B CN102236478B CN 201010228767 CN201010228767A CN102236478B CN 102236478 B CN102236478 B CN 102236478B CN 201010228767 CN201010228767 CN 201010228767 CN 201010228767 A CN201010228767 A CN 201010228767A CN 102236478 B CN102236478 B CN 102236478B
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Abstract
An optical touch display device includes a display panel and at least one light emitting and receiving unit. The display panel comprises a light-transmitting substrate, wherein the light-transmitting substrate is provided with a touch control surface and a plurality of side surfaces connected with the touch control surface. At least one of the side surfaces is a light incident surface, and at least one of the side surfaces is a light emergent surface opposite to the light incident surface. Each light emitting and receiving unit comprises a linear light source and a light detecting element. The line light source is arranged beside the light incident surface of the light-transmitting substrate and is suitable for providing light signals to the light-transmitting substrate. The light detection element is arranged beside the light-emitting surface of the light-transmitting substrate, the linear light source and the light detection element are positioned at two opposite sides of the light-transmitting substrate, and the light detection element is suitable for receiving optical signals provided by the linear light source. The optical touch display device has the advantage of low cost.
Description
Technical field
The present invention is relevant for a kind of touch control display apparatus, and particularly relevant for a kind of optical touch display apparatus.
Background technology
Touch control display apparatus has advantages of processing ease, so touch control display apparatus has been widely used in multiple electronic product in recent years, as mobile phone, personal digital assistant (personal digital assistant, PDA), digital still camera, music player, computer, Satellite Navigation Set etc.
Touch control display apparatus comprises display panel and touch control unit.At present common touch control unit has electric resistance touch-control unit and capacitance touching control unit, yet it has the higher shortcoming of cost.
Summary of the invention
The invention provides a kind of optical touch display apparatus, it has advantages of the lower and thinner thickness of cost.
The present invention separately provides a kind of optical touch display apparatus, and it has lower-cost advantage.
For reaching above-mentioned advantage, the present invention proposes a kind of optical touch display apparatus, and it comprises a display panel and the emission of at least one light and receiving element.Display panel is in order to show an image information, and display panel comprises a transparent substrates, and transparent substrates can make the image information penetrate.Transparent substrates has a touch surface and a plurality of sides that are connected touch surface, these sides one of them is one first incidence surface at least, these sides one of them is one first exiting surface relative with the first incidence surface at least.Each light emission and receiving element comprise a line source and a photodetector.Line source is disposed at by the first incidence surface of transparent substrates, and line source is suitable for providing light signal to enter to transparent substrates by the first incidence surface.Photodetector is disposed at by the first exiting surface of transparent substrates, and line source and photodetector are positioned at the relative both sides of transparent substrates.Photodetector is suitable for receiving the light signal that line source provides.
In one embodiment of this invention, above-mentioned line source comprises a light guide plate, a light-emitting component and a cover body.Light guide plate has one second adjacent incidence surface and one second exiting surface.The second exiting surface is relative with the first incidence surface, and light-emitting component is disposed at by the second incidence surface.The accommodating light guide plate of cover body and light-emitting component, wherein light guide plate is suitable for making the light-emitting component part optical signals that provides and the part optical signals that reflects from cover body to be passed to the first incidence surface.
In one embodiment of this invention, above-mentioned light-emitting component comprises the infrared light light-emitting component.
In one embodiment of this invention, above-mentioned light-emitting component comprises light emitting diode.
In one embodiment of this invention, above-mentioned photodetector comprises CMOS (CMOS) image detecting element or charge coupled cell (CCD).
In one embodiment of this invention, above-mentioned each light emission and receiving element more comprise one first reflecting element, be disposed between photodetector and the first exiting surface, and the first reflecting element are suitable for light signal is reflexed to photodetector.
In one embodiment of this invention, each above-mentioned light emission and the first reflecting element of receiving element comprise one first prism.This first prism has one the 3rd incidence surface, a reflecting surface and one the 3rd exiting surface, and the 3rd incidence surface is relative with the first exiting surface, and the 3rd exiting surface is relative with photodetector, and reflecting surface is connected between the 3rd exiting surface and the 3rd incidence surface.
In one embodiment of this invention, above-mentioned each light emission and receiving element more comprise a first refractive element, be disposed between the first reflecting element and the first exiting surface, and the first refractive element are suitable for light signal is refracted to the first reflecting element.
In one embodiment of this invention, above-mentioned each light emission and receiving element more comprise one second reflecting element, be disposed between line source and the first incidence surface, and the second reflecting element are suitable for light signal is reflexed to the first incidence surface.
In one embodiment of this invention, each above-mentioned light emission and the second reflecting element of receiving element comprise one second prism.This second prism has one the 4th incidence surface, a reflecting surface and one the 4th exiting surface, and the 4th incidence surface is relative with line source, and the 4th exiting surface is relative with the first incidence surface, and reflecting surface is connected between the 4th exiting surface and the 4th incidence surface.
In one embodiment of this invention, above-mentioned each light emission and receiving element more comprise one second refracting element, be disposed between the second reflecting element and the first incidence surface, and the second refracting element are suitable for light signal is refracted to the first incidence surface.
In one embodiment of this invention, above-mentioned touch surface and a surface relative with touch surface are respectively equipped with a reflection horizon, and the reflection horizon is suitable for reflective for visible light wavelengths scope light signal in addition.
In one embodiment of this invention, each above-mentioned reflection horizon is suitable for the reflective infrared light signal.
In one embodiment of this invention, above-mentioned display panel comprise a first substrate, a second substrate and be disposed at first substrate and second substrate between a display layer, and second substrate is transparent substrates.
In one embodiment of this invention, the light signal that provides of above-mentioned line source produces total reflection in transparent substrates.When touching control contact touch surface, touching control is destroyed the total reflection of part optical signals, so that photodetector detects the position of touching control.
For reaching above-mentioned advantage, the present invention separately proposes a kind of optical touch display apparatus, and it comprises a display panel, a transparent substrates and the emission of at least one light and receiving element.Display panel is in order to show an image information, and display panel comprise a first substrate, a second substrate and be disposed at first substrate and second substrate between a display layer, transparent substrates is disposed on the second substrate of display panel and the image information is penetrated.Transparent substrates has a touch surface and a plurality of sides that are connected touch surface, these sides one of them is an incidence surface at least, and these sides one of them is an exiting surface relative with incidence surface at least.Each light emission and receiving element comprise a line source and a photodetector.Line source is disposed at by the incidence surface of transparent substrates, and line source is suitable for providing light signal to enter to transparent substrates by incidence surface.Photodetector is disposed at by the exiting surface of transparent substrates, and line source and photodetector are positioned at the relative both sides of transparent substrates, and photodetector is suitable for receiving the light signal that line source provides.
The optical touch display apparatus of various embodiments of the present invention is because adopting lower-cost light emission and receiving element to reach touch controllable function, so have lower-cost advantage.In addition, the optical touch display apparatus of one embodiment of the invention does not need to use in addition other transparent substrates, so can reduce optical touch display apparatus thickness because of by the transparent substrates of the display panel Transfer Medium as light signal.
For above and other purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is the schematic top plan view of a kind of optical touch display apparatus of one embodiment of the invention.
Fig. 2 is the diagrammatic cross-section of the optical touch display apparatus of Fig. 1.
Fig. 3 is the schematic top plan view of a kind of optical touch display apparatus of another embodiment of the present invention.
Fig. 4 is the schematic top plan view of a kind of optical touch display apparatus of another embodiment of the present invention.
Fig. 5 is the schematic top plan view of a kind of optical touch display apparatus of another embodiment of the present invention.
Fig. 6 is the schematic top plan view of a kind of optical touch display apparatus of another embodiment of the present invention.
Fig. 7 is the schematic top plan view of a kind of optical touch display apparatus of another embodiment of the present invention.
Fig. 8 is the diagrammatic cross-section of the optical touch display apparatus of Fig. 7.
The main element symbol description:
100: touching control
200,200a, 200b, 200c, 200d, 300: optical touch display apparatus
210,310: display panel 211: first substrate
212: transparent substrates (second substrate) 213: display layer
212a, 331: touch surface 212b, 212e: the first incidence surface (side)
212c, 212d: the first exiting surface (side)
220,220a, 220b, 220c, 220d, 320: light emission and receiving element
222,322: line source 222a, 322a: light-emitting component
222b, 322b: light guide plate 222c, 322c: cover body
222d: the second incidence surface 222e: the second exiting surface
223,323: light signal 224,324: photodetector
226: the first reflecting element 226a: the 3rd incidence surface
226b: reflecting surface 226c: the 3rd exiting surface
227: 228: the second reflecting elements of first refractive element
228a: the 4th incidence surface 228b: reflecting surface
228c: the 4th exiting surface 229: the second refracting element
330: transparent substrates 332,335: incidence surface (side)
333,334: exiting surface (side)
Embodiment
Fig. 1 is the schematic top plan view of a kind of optical touch display apparatus of one embodiment of the invention, and Fig. 2 is the diagrammatic cross-section of the optical touch display apparatus of Fig. 1.Please refer to Fig. 1 and Fig. 2, the optical touch display apparatus 200 of the present embodiment comprises display panel 210 and at least one light emission and receiving element 220, and Fig. 1 is take two light emissions and receiving element 220 as example.
Above-mentioned each light emission and receiving element 220 comprise line source 222 and photodetector 224.These line sources 222 are disposed at respectively by the first incidence surface 212b, the 212e of transparent substrates 212, and line source 222 is suitable for providing light signal 223 to transparent substrates 212.These photodetectors 224 are disposed at respectively by the first exiting surface 212c, the 212d of transparent substrates 212.The line source 222 of the emission of each light and receiving element 220 and photodetector 224 are positioned at the relative both sides of transparent substrates 212, and photodetector 224 is suitable for receiving the light signal 223 that line source 222 provides.
Each above-mentioned line source 222 for example comprises light-emitting component 222a, light guide plate 222b and cover body 222c.Each light guide plate 222b has one second adjacent incidence surface 222d and one second exiting surface 222e.The second exiting surface 222e of these light guide plate 222b is relative with the first incidence surface 212b, 212e respectively.Light-emitting component 222a is disposed at by the second incidence surface 222d, and the accommodating light guide plate 222b of cover body 222c and light-emitting component 222a.Light-emitting component 222a is for example the infrared light light-emitting component.Particularly, light-emitting component 222a can be light emitting diode, but not as limit.In addition, these light guide plate 222b is suitable for making light-emitting component the 222a part optical signals 223 that provides and the part optical signals 223 that reflects from cover body 222c to be passed to the first incidence surface 212b, 212e.
In general environment for use, when contacting, the medium that touch surface 212a contacts is not for example air by touching control (as finger) as the touch surface 212a of transparent substrates 212.The light signal 223 that line source 222 provides can be in the interior generation total reflection of transparent substrates 212 after the first incidence surface 212b, 212e incident transparent substrates 212, and from the first exiting surface 212c, the 212d outgoing of transparent substrates 212, to be received by photodetector 224.Above-mentioned two line sources, 222 one of them light signal that provide 223 are for example to advance along the direction of paralleled by X axis, and the light signal 223 that another line source 222 provides is for example to advance along the direction of parallel Y-axis.In addition, when touching control 100(as the finger, the pen or other objects) when touching touch surface 212a, because the refractive index of touching control 100 is different from the refractive index of air, the light signal 223 that causes being passed to the part touch surface 212a that touching control 100 contacts can't produce total reflection, so that can't be received by photodetector 224.So, the position that does not receive the subregion of light signal 223 in can the detection zone according to photodetector 224 judges the position of touching control 100.In other words, when touching control 100 touches touch surface 212a, touching control 100 can be destroyed the total reflection of part optical signals 223, make the part detection zone of photodetector 224 can't receive light signal 223, so can judge by the zone that does not receive light signal 223 of detection zone the position of touching control 110.
In the present embodiment, photodetector 224 can be CMOS image detecting element (CMOS image sensor), charge coupled cell (charge coupled device, CCD) or other suitable photodetectors.In addition, be positioned at the other photodetector 224 of the first exiting surface 212c and can detect touching control 100 in the position of X-axis, can detect touching control 100 in the position of Y-axis and be positioned at the other photodetector 224 of the first exiting surface 212d.Therefore, touching control 100 can be detected in the tram of touch surface 212a by this two photodetector 224.
The optical touch display apparatus 200 of the present embodiment is to utilize the optical detection mode to reach touch controllable function, because the cost of light emission and receiving element 220 is low than electric resistance touch-control unit and capacitance touching control unit, so the optical touch display apparatus 200 of the present embodiment has lower-cost advantage.In addition, the optical touch display apparatus 200 of the present embodiment does not need to use in addition other transparent substrates, so can reduce the thickness of optical touch display apparatus 200 because of by the transparent substrates 212 of display panel 210 Transfer Medium as light signal 223.
Should be noted, although the present embodiment is take the emission of two light and receiving element 220 as example, in another embodiment, also visual actual demand, and the quantity of light emission and receiving element 220 is adjusted to one or more.In addition, in order to promote the reflectivity of light signal 223, at touch surface 212a and a surperficial 212f relative with touch surface 212a, one reflection horizon (not shown) can be set respectively.The demonstration information that shows due to display panel 210 is visible light, so this reflection horizon is in order to the light signal beyond the reflective for visible light wavelengths scope.For instance, be in the embodiment of infrared light light-emitting component at light-emitting component 222a, each reflection horizon is suitable for the reflective infrared light signal.
Fig. 3 is the schematic top plan view of a kind of optical touch display apparatus of another embodiment of the present invention.Please refer to Fig. 3, the optical touch display apparatus 200a of the present embodiment is similar to above-mentioned optical touch control display device 200, and difference is in each light emission and the receiving element 220a of optical touch display apparatus 200a and more comprises one first reflecting element 226.Each first reflecting element 226 is arranged between corresponding photodetector 224 and corresponding the first exiting surface 212c/212d.In addition, each first reflecting element 226 is for example the first prism, and it is in order to reflex to photodetector 224 with light signal 223.This first prism has one the 3rd incidence surface 226a, a reflecting surface 226b and one the 3rd exiting surface 226c, the 3rd incidence surface 226a is relative with the first corresponding exiting surface 212c/212d, the 3rd exiting surface 226c is relative with corresponding photodetector 224, and reflecting surface 226b is connected between the 3rd exiting surface 226c and the 3rd incidence surface 226a.
Fig. 4 is the schematic top plan view of a kind of optical touch display apparatus of another embodiment of the present invention.Please refer to Fig. 4, optical touch display apparatus 200b is similar to above-mentioned optical touch control display device 200a, difference is in each light emission and the receiving element 220b of optical touch display apparatus 200b and more comprises a first refractive element 227, be disposed between the first reflecting element 226 and corresponding the first exiting surface 212c/212d, and first refractive element 227 is suitable for light signal 223 is refracted to the first reflecting element 226.In addition, although the first refractive element 227 of Fig. 4 does not contact with the first reflecting element 226, in another embodiment, first refractive element 227 also can contact the 3rd incidence surface 226a of the first reflecting element 226.
Fig. 5 is the schematic top plan view of a kind of optical touch display apparatus of another embodiment of the present invention.Please refer to Fig. 5, the optical touch display apparatus 200c of the present embodiment is similar to above-mentioned optical touch control display device 200, difference is in each light emission and the receiving element 220c of optical touch display apparatus 200c and more comprises one second reflecting element 228, be disposed between corresponding line source 222 and corresponding the first incidence surface 212b/212e, and the second reflecting element 228 is suitable for light signal 223 is reflexed to the first incidence surface 212b/212e of correspondence.Second reflecting element 228 of the present embodiment is for example one second prism.This second prism has one the 4th incidence surface 228a, a reflecting surface 228b and one the 4th exiting surface 228c.The 4th incidence surface 228a is relative with corresponding line source 222, and the 4th exiting surface 228c is relative with the first corresponding incidence surface 212b/212e, and reflecting surface 228b is connected between the 4th exiting surface 228c and the 4th incidence surface 228a.
Fig. 6 is the schematic top plan view of a kind of optical touch display apparatus of another embodiment of the present invention.Please refer to Fig. 6, optical touch display apparatus 200d is similar to above-mentioned optical touch control display device 200c, difference is in the emission of each light and the receiving element 220d of optical touch display apparatus 200d and more comprises one second refracting element 229, is disposed between the second corresponding reflecting element 228 and corresponding the first incidence surface 212b/212e.The second refracting element 229 is suitable for light signal 223 is refracted to the first corresponding incidence surface 212b/212e.In addition, although the second refracting element 229 of Fig. 6 does not contact the second reflecting element 228, in another embodiment, the second refracting element 229 also can contact the 4th incidence surface 228a of the second reflecting element 228.
Above-mentioned optical touch display apparatus 200a, 200b, the advantage of 200c, 200d are similar to the advantage of optical touch control display device 200, will no longer repeat at this.
Fig. 7 is the schematic top plan view of a kind of optical touch display apparatus of another embodiment of the present invention, and Fig. 8 is the diagrammatic cross-section of the optical touch display apparatus of Fig. 7.Please refer to Fig. 7 and Fig. 8, the optical touch display apparatus 300 of the present embodiment comprises the emission of display panel 310, at least one light and receiving element 320 and transparent substrates 330, and Fig. 7 is take two light emissions and receiving element 320 as example.Display panel 310 is in order to show an image information, and display panel 310 comprise a first substrate 311, a second substrate 312 and be disposed at first substrate 311 and second substrate 312 between a display layer 313, and transparent substrates 330 is to be disposed on the second substrate 312 of display panel 310.Transparent substrates 330 has touch surface 331 and a plurality of sides that are connected touch surface 331 (as side 332,333,334,335).These sides 332,333,334,335 one of them is incidence surface at least, and these sides 332,333,334,335 one of them is the exiting surface relative with incidence surface at least.In more detail, the quantity of incidence surface light emission corresponding to the quantity of exiting surface and receiving element 320.Because the present embodiment is as example, so the quantity of incidence surface and exiting surface is respectively two take the emission of two light and receiving element 320.In the present embodiment, side 332,335 is incidence surface, and side 333,334 is exiting surface, hereinafter will claim side 332,335 to be incidence surface 332,335, and claim that side 333,334 is exiting surface 333,334.
Above-mentioned each light emission and receiving element 320 comprise line source 322 and photodetector 324.Line source 322 is disposed at incidence surface 332,335 sides of transparent substrates 330, and line source 322 is suitable for providing light signal 323 to transparent substrates 330.Photodetector 324 is disposed at exiting surface 333,334 sides of transparent substrates 330.The line source 322 of the emission of each light and receiving element 320 and photodetector 324 are positioned at the relative both sides of transparent substrates 330, and photodetector 324 is suitable for receiving the light signal 323 that line source 322 provides.
Each above-mentioned line source 322 for example comprises light-emitting component 322a, light guide plate 322b and cover body 322c, and this line source 322 is similar to above-mentioned line source 222, will no longer describe in detail at this.
In general environment for use, during by touching control (as finger) contact, the medium that touch surface 212a contacts is not for example air when the touch surface 331 of transparent substrates 330.The light signal 323 that line source 322 provides can be in the interior generation total reflection of transparent substrates 330 after incidence surface 332,335 incident transparent substrates 330, and from exiting surface 333,334 outgoing of transparent substrates 330, to be received by corresponding photodetector 324.Above-mentioned two line sources 322 light signal that provides 323 wherein is for example to advance along the direction of paralleled by X axis, and the light signal 323 that another line source 322 provides is for example to advance along the direction of parallel Y-axis.In addition, when touching control 100(as the finger, the pen or other objects) when touching touch surface 331, because the refractive index of touching control 100 is different from the refractive index of air, the light signal 323 that causes being passed to the part touch surface 331 that touching control 100 contacts can't produce total reflection, so that can't be received by photodetector 324.So, the position that does not receive the subregion of light signal 323 in can the detection zone according to photodetector 324 judges the position of touching control 100.In other words, touching control 100(is as finger) when touching touch surface 331, touching control 100 can be destroyed the total reflection of part optical signals 323, so that the part detection zone can't receive light signal 323, so can judge by the zone that does not receive light signal 323 of detection zone the position of touching control 110.
In the present embodiment, photodetector 324 can be CMOS image detecting element (CMOS image sensor), charge coupled cell (charge coupled device, CCD) or other suitable photodetectors.In addition, be positioned at exiting surface 333 other photodetectors 324 and can detect touching control 100 in the position of X-axis, can detect touching control 100 in the position of Y-axis and be positioned at exiting surface 334 other photodetectors 324.Therefore, touching control 100 can be detected in the tram of touch surface 331 by this two photodetector 324.
The optical touch display apparatus 300 of the present embodiment is to utilize the optical detection mode to reach touch controllable function, because the cost of light emission and receiving element 320 is low than electric resistance touch-control unit and capacitance touching control unit, so the optical touch display apparatus 300 of the present embodiment has lower-cost advantage.
Should be noted, although the present embodiment is take the emission of two light and receiving element 320 as example, in another embodiment, also visual actual demand, and the quantity of light emission and receiving element 320 is adjusted to one or more.In addition, the light of the present embodiment emission and receiving element 320 also can comprise the first above-mentioned reflecting element, first refractive element, two reflecting elements and the second refracting element at least one of them.
Although the present invention discloses as above with preferred embodiment; so it is not to limit the present invention; the persond having ordinary knowledge in the technical field of the present invention; without departing from the spirit and scope of the present invention; when can do a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (13)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010228767 CN102236478B (en) | 2010-05-04 | 2010-07-16 | Optical touch display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010161679 | 2010-05-04 | ||
| CN201010161679.4 | 2010-05-04 | ||
| CN 201010228767 CN102236478B (en) | 2010-05-04 | 2010-07-16 | Optical touch display device |
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| Publication Number | Publication Date |
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| CN102236478A CN102236478A (en) | 2011-11-09 |
| CN102236478B true CN102236478B (en) | 2013-06-05 |
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| CN 201010228767 Expired - Fee Related CN102236478B (en) | 2010-05-04 | 2010-07-16 | Optical touch display device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104978076B (en) * | 2014-04-03 | 2019-04-26 | 联想(北京)有限公司 | Infrared optics touch screen system and electronic equipment |
| TWI509487B (en) * | 2014-04-25 | 2015-11-21 | Coretronic Corp | Interactive touch system and light source device |
| WO2016029376A1 (en) * | 2014-08-27 | 2016-03-03 | Hewlett-Packard Development Company, L.P. | Screen contact detection using total internal reflection |
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|---|---|---|---|---|
| US4868912A (en) * | 1986-11-26 | 1989-09-19 | Digital Electronics | Infrared touch panel |
| CN1853160A (en) * | 2003-09-22 | 2006-10-25 | 皇家飞利浦电子股份有限公司 | Touch input screen using a light guide |
| CN1991968A (en) * | 2005-12-28 | 2007-07-04 | 明基电通股份有限公司 | Display device |
| CN101424993A (en) * | 2007-11-02 | 2009-05-06 | 群康科技(深圳)有限公司 | Infrared touch control system |
| TWM363032U (en) * | 2009-02-25 | 2009-08-11 | Pixart Imaging Inc | Optical touch control module |
| TW201009671A (en) * | 2008-08-21 | 2010-03-01 | Tpk Touch Solutions Inc | Optical semiconductor laser touch-control device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8031186B2 (en) * | 2006-07-06 | 2011-10-04 | Flatfrog Laboratories Ab | Optical touchpad system and waveguide for use therein |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4868912A (en) * | 1986-11-26 | 1989-09-19 | Digital Electronics | Infrared touch panel |
| CN1853160A (en) * | 2003-09-22 | 2006-10-25 | 皇家飞利浦电子股份有限公司 | Touch input screen using a light guide |
| CN1991968A (en) * | 2005-12-28 | 2007-07-04 | 明基电通股份有限公司 | Display device |
| CN101424993A (en) * | 2007-11-02 | 2009-05-06 | 群康科技(深圳)有限公司 | Infrared touch control system |
| TW201009671A (en) * | 2008-08-21 | 2010-03-01 | Tpk Touch Solutions Inc | Optical semiconductor laser touch-control device |
| TWM363032U (en) * | 2009-02-25 | 2009-08-11 | Pixart Imaging Inc | Optical touch control module |
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