CN101762956B - LCOS projection display system - Google Patents
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- CN101762956B CN101762956B CN2009102516061A CN200910251606A CN101762956B CN 101762956 B CN101762956 B CN 101762956B CN 2009102516061 A CN2009102516061 A CN 2009102516061A CN 200910251606 A CN200910251606 A CN 200910251606A CN 101762956 B CN101762956 B CN 101762956B
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Abstract
The present invention discloses an LCOS projection display device which comprises a screen, a light engine, a projecting lens and image sensor. The optical engine comprises a polarized spectroscope and an LCOS device at one edge of the polarized spectroscope, wherein the polarized spectroscope reflects incident light to the LCOS device, and the LCOS device generates an optical image on the basis of pixel information of data images and incident light by means of modulation. The projection lens projects optical images produced by the light engine on the screen and allows infrared light from the screen to pass through. The image sensor senses the infrared light from the projection lens to form a sensing image. Thus, the image sensor can detect touch of any areas on the screen.
Description
[technical field]
The present invention relates to field of projection display, especially relate to the LCOS projection display equipment (Liquid Crystal On Silicon projection system is called for short the LCOS projection display equipment) that can carry out one or more contacts measuring ability.
[background technology]
Projection display system can receive the picture signal from external video equipment, and enlarged image is projected on the display screen, and it is suitable for being used for introducing some information to mass viewer audiences.In general, projection display system comprises light source, light engine (Light engine), controller and display screen.When external image signal input projection display system, said controller will obtain the Pixel Information (such as color and gray scale) of said image, and the operation of controlling the image component in the said light engine is to reproduce or the said image of reconstruct.Image component in the said light engine is through combination or modulate the three primary colors image to reconstruct full-colour image, afterwards said full-colour image is projected on the said display screen.
At present commonly used mainly contain three kinds of projection display systems, first kind can be called as liquid crystal projection display systems (liquid-crystal-display projection display system is called for short the LCD projection display system).Said LCD projection display system includes many pixels, and each pixel is filling liquid crystal and forming between two transparent panels all.Said liquid crystal can be used as light valve or optical gate, and the light quantity that sees through each pixel is to be determined by the polarizing voltage on the liquid crystal that puts on this pixel (Polarization Voltage).Through modulating this polarizing voltage, image parameter such as brightness that can the control chart picture or gray scale.For coloured image, be directed seeing through three LCD panels respectively from the isolated primaries of white light source.Based on the Pixel Information that said controller gets access to, each LCD panel shows a kind of in the three primary colors (red, green and blue) of said image.Subsequently, these three primary colors images in said light engine by reconstruct or be combined as full-colour image.Afterwards, said reconstructed image is calibrated and amplified through projection lens (Projection lens), and directly or indirectly project on the display screen.
Second kind can be called as digital light and handle projection display system (digital light processing projection display system is called for short the DLP projection display system).The core devices of said DLP projection display system is the DMD of being made up of micro mirror array (Digital Micromirror Device is called for short DMD), and each micro mirror in the said micro mirror array all can be represented or a pixel of correspondence image.Different with the transmission projection technology in the LCD projection display system, what the DLP projection display system adopted is the reflective projection technology.Thereby the eyeglass angle through adjusting each micro mirror can import light into or derive said projection lens, and then control arrives the light quantity of each pixel of said projection lens.Can obtain color of image through light source being passed rotation colour wheel (Color wheel); Specifically, said colour wheel has red, green and primary colors, when light passes through the red part of colour wheel; The image that projects is the gray level image of a width of cloth whole red, and blueness and yellow are in like manner.When the fast rotational of colour wheel, then can obtain a secondary three primary colors image, after the three primary colors image was by projection, because human eye has the characteristic of persistence of vision, we just can observe the full-color image by the stack of reddish yellow primary colors.
The third can be by liquid crystal on silicon projection display system (Liquid Crystal On Silicon projection system is called for short the LCOS projection display equipment).Different with the reflective projection of the transmission projection of LCD projection display system and DLP optical projection system, in the LCOS projection display equipment, liquid crystal layer is arranged between transparent film transistor (thin-film transistor is called for short TFT) layer and the silicon semiconductor layer.Said silicon semiconductor layer has reflecting surface; When light shines on the LCOS device; Said liquid crystal will be worked and will be light valve or optical gate, thereby control arrives the light quantity of the silicon semiconductor reflecting surface under it, and said silicon semiconductor reflecting surface then reflects the light that shines on it.Say that in a sense the LCOS projection-type is similar to the combination of LCD projection and DLP projection.
Similar in color principle in the LCOS projection display equipment and the LCD projection display system.White light source is seen through a series of wavelength selects dichronic mirror or light filter can be separated into primaries.These primaries are through one group of polarization spectroscope (polarized beam splitter; Be called for short PBS) be diverted on the LCOS device of being responsible for this primary colors; Be imported on the blue LCOS device such as blue light, red light is imported on the red LCOS device, and green light is imported on the green LCOS device.The polarizing voltage that said LCOS device is modulated the liquid crystal of each pixel according to the gray-scale value that defines in each pixel in the image, and reflection original color image.Afterwards, this three primary colors image is by reconstruct or be combined as full-colour image, and is last, said reconstruct full-colour image is calibrated and amplified through projection lens, and directly or indirectly project on the display screen.
The application of these optical projection systems receives much attention recently, especially in desktop computer (table computer) or surface computer (surface computer) field.Said surface computer uses special user interface to replace keyboard and mouse, its allow user directly to show with operation with touch screen interaction and touch-screen on target.When the target on user and the display screen was mutual, the part of a key was exactly the performance that multiconductor detects.
Fig. 5 shows a framework of the multiconductor detection system of surface computer 500.In this framework, the projection lens 520 of projection display system projects video images onto on the display surface 510.Said projection lens 520 is positioned at towards the center of the backboard of said display surface 510.Near-infrared LED light source 540 emission wavelengths are the back side of the light of 850 nanometers to said display surface 510.When an object touches said display surface 510, the touch occurrence positions of said display surface 510 will reflect said near infrared light.Four infrared cameras 530 detect from the said near infrared lights of display surface 510 reflections, and each covers about 1/4 zone of said display surface 510.Processor (not shown) will lump together from the image sets of each camera 530, and calculates the position that touches input.
Desktop computer directly projects image onto display surface such as Microsoft surface (Microsoft Surface), and it is positioned over the position corresponding with the center of display surface with said projection lens usually and is distorted to prevent projected image.The center of departing from said projection lens that any camera of installing senses touch to import all has to be set up.If only with an off-centered camera whole viewing area is touched detection, the infrared image of its collection will twist so.Through analyzing such warp image and calculating accurate touch location will be more complicated and difficulty.Therefore, the Microsoft's such projection display system in surface shown in the image pattern 7 has adopted a plurality of cameras, and each camera only covers the part of viewing area.Subsequently, will can cover the image of whole display surface from the synthetic pair of the unwrung image sets of each camera.For image is projected to the optical projection system on the said display surface indirectly, optical device such as the mirror and the camera lens that are used to change said projected image direction, can hinder equally and use a camera that is positioned at the center to be used to carry out multiple point touching input detection.
For accurate many touch inputs, a plurality of infrared cameras of present Technology Need and the resources that will make up of detecting in projection display system from the image of each independent camera.These need all will improve the cost of projection display system, and increase the complexity of projection display system.
Therefore, demand proposing a kind of multiconductor detection scheme that can be applicable in the projection display system urgently.
[summary of the invention]
The purpose of this part is to summarize some aspects of embodiments of the invention and briefly introduces some preferred embodiments.In this part and the application's specification digest and denomination of invention, may do a little simplification or omit avoiding the making purpose of this part, specification digest and denomination of invention fuzzy, and this simplification or omit and can not be used to limit scope of the present invention.
One of technical matters that the present invention will solve is to provide a kind of LCOS projection display equipment, and based on said LCOS projection display equipment multiconductor being detected becomes and maybe or be achieved.
In order to address the above problem, according to an aspect of the present invention, the invention provides a kind of LCOS projection display equipment, it comprises screen, light engine, projection lens and imageing sensor.Said light engine comprises polarization spectroscope and the LCOS device that is positioned at an edge of said polarization spectroscope; Said polarization spectroscope reflexes to said LCOS device with incident light, and said LCOS device generates optical imagery based on the Pixel Information and the incident light modulation of said data image.On optical image projection to the said screen of said projection lens with said light engine generation, and allow to see through from the infrared light of said screen.Said image sensor senses from the infrared light of said projection lens to form sensed image.
Further, it also includes image processing module, and said image processing module receives the sensed image from imageing sensor, and determines the coordinate or the position of infrared light based on said sensed image.
Further, said projection lens filtering or subdue visible light and ultraviolet light from screen.
Further, in a side of the projection lens of screen infrared transmitter is set, said infrared transmitter emission infrared light or near infrared light are to the back side of said screen, and when said screen was touched, each touches all can reflected infrared to said projection lens.
Further; Said screen includes an acryl layer at least; At the edge of acryl layer installing infrared transmitter; The infrared light of said infrared transmitter emission does not stop reflection in acryl layer, but when said screen was touched, IR can be directed to said projection lens from the touch place.
Further, when on screen, having a plurality of touch point, each touch point all can form an infrared light, and said infrared light is transmitted to said imageing sensor through said projection lens.
Further, when the finger touch screen, its body temperature will make outwards emission infrared light of this finger, and these infrared rays then can be used as the infrared light that touch screen produces.
The infrared light that sends when further, using infrared pen to produce touch screen.
Further, said imageing sensor is placed in another edge of said LCOS device, is reflexed on the said imageing sensor by said polarization spectroscope from the infrared light of said projection lens.
Compared with prior art; Said imageing sensor of the present invention will be multiplexed with its collection lens as the projection lens of image projection and gathers the image on screen or the screen orientation; Like this; The infrared signal that results from any viewing area of screen can both turn back to said projection lens according to projection path, arrives imageing sensor at last, that is to say that said imageing sensor just can detect the touch in any zone on the screen.
About other purposes of the present invention, characteristic and advantage will combine accompanying drawing in embodiment, to describe in detail below.
[description of drawings]
In conjunction with reference to accompanying drawing and ensuing detailed description, the present invention will be more readily understood, the structure member that wherein same Reference numeral is corresponding same, wherein:
Fig. 1 shows an embodiment of LCOS projection display equipment;
Fig. 2 shows an embodiment with the LCOS projection display equipment that touches measuring ability;
Fig. 3 shows an example of the image processing module among Fig. 2;
Fig. 4 shows and can unite an embodiment of the infrared pen of use with image inductor; With
Fig. 5 shows a framework of projection display system in the desktop computer.
[embodiment]
Detailed description of the present invention is mainly come the running of direct or indirect simulation technical scheme of the present invention through program, step, logical block, process or other symbolistic descriptions.Be the thorough the present invention that understands, in ensuing description, stated a lot of specific detail.And when not having these specific detail, the present invention then possibly still can realize.Affiliated those of skill in the art use these descriptions here and state that the others skilled in the art in affiliated field effectively introduce their work essence.In other words, be the object of the invention of avoiding confusion, owing to method, program, composition and the circuit known are readily appreciated that, so they are not described in detail.
Alleged here " embodiment " or " embodiment " are meant special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention.Different in this manual local " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or optionally mutually exclusive with other embodiment embodiment.In addition, represent that the sequence of modules and revocable in method, process flow diagram or the functional block diagram of one or more embodiment refers to any particular order, also be not construed as limiting the invention.
An embodiment who shows LCOS projection display equipment 100 of Fig. 1 signal.Said LCOS projection display equipment 100 includes light source 120, light engine 140, projection lens 160 and screen (or being referred to as display screen) 180.
Said light source 120 includes red, green and blue LED, and said light source 120 is according to the quick repeat its transmission ruddiness of order, green glow and blue light, and said 120 each moment of light source are only launched a kind of light of color.The light of said light source 3120 emissions gets into light engine 140.The light transmission of said light source 120 emissions has the device 141 of S polarization optical filter and collimation lens, gets into polarization spectroscope (polarized beam splitter is called for short PBS) 142 afterwards.Said S polarized light is reflected by said polarization spectroscope 142, sees through quarter wave plate 143 to LCOS devices 144 afterwards, and said LCOS device 144 is positioned at an edge of said polarization spectroscope 142.Based on the Pixel Information of input picture (be the image of data sense this moment, is called for short data image) and the light of incident, said LCOS device 344 generates the monochrome image that only comprises a kind of color component (such as red component).Because the S polarized light can reflect in LCOS device 144, the polarity of the said light that is reflected also can change thereupon, is the P polarization by the S polarization conversion promptly.Said P polarized light or image get into and see through said polarization spectroscope 142 once more.The said projection end 160 will project to from the said monochrome image of said polarization spectroscope 142 on the said screen 180.Because light source can repeat to launch fast said three primary colors (RGB) light according to order, their corresponding monochrome images will be projected to same speed order on the said screen 180.Therefore, because the persistence of vision effect of human eye just can form the color modulation image.
Fig. 2 shows an embodiment with the LCOS projection display equipment 200 that touches measuring ability.Said LCOS projection display equipment 200 shown in Fig. 2 is similar with the structure major part of the LCOS projection display equipment 100 shown in Fig. 1; Both differences are: the former is except the unit that the latter comprises; Also include image inductor 210 and image processor 230, wherein the working method of the former unit identical of comprising and principle identical with the latter all with the latter.Said imageing sensor 210 can be charge-coupled device (CCD) CCD or cmos sensor, and it can be responded to from the infrared light of projection lens 260 forming sensed image, and can export said image to image processing module 230.Said imageing sensor 210, light engine 240, projection lens 260 and image processing module 230 common cooperations can be accomplished on the screen measuring ability of the one or more contacts on 280.
Fig. 2 shows the example that a concrete touch detects; When an object 202 (such as finger, felt pen or other object) touch screen 280; Can generate infrared light 204 in this position; Said infrared light 204 will penetrate said projection lens 260 along projection path and get into light engine 240; S polarization part in the said infrared light 204 of polarization spectroscope 242 reflection in the said light engine 240 is to said imageing sensor 210, and is same when an object 203 (such as finger, felt pen or other object) touch screen 280, can generate infrared light 205 in this position; Said infrared light 205 will penetrate said projection lens 260 along projection path and get into light engine 240, and the S polarization part in the said infrared light 204 of polarization spectroscope 242 reflections in the said light engine 240 is to said imageing sensor 210.Each pixel in the said imageing sensor 210 is corresponding with each position on the screen 280, therefore just can obtain the coordinate of the screen 280 that said object 202 and 203 touched through the sensitivity speck of analyzing said imageing sensor 210 output images.Equally, the concrete course of work and the implementation of said image processing module 230 will be explained in greater detail below.
In one embodiment; Said projection lens 260 can filtering get into visible light and ultraviolet light in it from screen orientation; And only allow infrared light to get in it from screen orientation, so equally also can get rid of or reduce the interference of bringing for the induction of the infrared light of imageing sensor 210 by visible light or ultraviolet light.
Important feature, advantage or a characteristic of the present invention are: said imageing sensor will be multiplexed with its collection lens as the projection lens of image projection and gathers the infrared image on screen or the screen orientation, through the existing optical device in the light engine (such as such as the spectroscope 242 that polarizes) infrared image of projection lens collection is guided to imageing sensor afterwards.Like this, on the one hand, because projection lens can be positioned at the center of said screen, so the image on the screen orientation of its collection generally can not be distorted, and subsequent processes is more convenient and easy; On the other hand; Because projection lens itself is used for projection; And view field's (being the viewing area of screen) just imageing sensor hope region covered, so this projection lens can cover whole view field or viewing area fully, and then can satisfy the needs that the contact is detected fully; In other words; The infrared signal that results from any viewing area of screen can both turn back to said projection lens according to projection path, arrives imageing sensor at last, and said like this imageing sensor just can detect the touch in any zone on the screen; Again on the one hand, because light generally has very strong anti-interference, multiplexing projection lens can not have any impact to image through its projection and the image through its collection; On the one hand, do not need that external camera is installed specially again and be used for infrared detection in addition, need not do any change simultaneously yet existing light engine; Just can realize utilizing lens to gather its corresponding infrared light; And and then realize having more a monitoring, promptly save the space, also save cost.
The mode of the screen generation infrared light of object touch projection display system has a variety of, introduces several kinds of practical modes below.
In one embodiment; Just as that kind shown in Fig. 5; Can infrared transmitter be set (such as IR LED in a side of the projection lens of screen; Infrarede emitting diode), said infrared transmitter emission infrared light or near infrared light arrive the back side of said screen (such as 280 among Fig. 2), and cover whole screen.In a preferred embodiment, can use a plurality of IR LED to guarantee to cover fully the viewing area of said screen.Usually the infrared light of launching is can be to back reflective (not promptly not can this side of reflected back projection lens), and when having object to touch said screen, said infrared light will reflect in the touch point.In addition, if when having a plurality of zones to be touched simultaneously, each touch area all can reflected infrared, such as the infrared light among Fig. 2 204 and 205.In this embodiment, the object of touch screen can be that finger, felt pen or other materials such as silica gel etc. have certain toughness and reflexive material.
In another embodiment; Can use FTIR (Frustrated Total Internal Reflection, frustrated total internal reflection) technology to realize the generation of infrared light, said screen includes an acrylic board (Acrylic) layer at least; Install infrared transmitter (such as IR LED at the edge of acryl layer; Can be a plurality of), the infrared light of said infrared transmitter emission can not stop reflection in acryl layer, and can not run out; This is referred to as total internal reflection (Total Internal Reflection); But when your finger (perhaps other materials such as silica gel etc. have certain toughness and reflexive material) was run into the acrylic surface, total internal reflection was destroyed, and IR is pointed reflection and come out.Same, when having a plurality of zones to be touched, each touch area all can produce infrared ray.
In another embodiment, can be with human body as the infrared light emissive source with body temperature, when the finger touch screen, its body temperature will make outwards emission infrared light of this finger, and these infrared rays then can be used as the infrared light that touch screen produces.In another embodiment; The infrared light that can use infrared pen (IR stylus) to send when producing touch screen; Even need really not touch screen this moment; Only need to use infrared pen emission infrared light to screen, get final product, these infrared lights can penetrate screen (situation of rear-projection) or by screen reflect (situation of preceding throwing) thus the visual field of entering projection lens.Hereinafter enumerated a kind of concrete realization example of said infrared pen, particular content will be described in more detail below.
Fig. 3 is for showing the functional-block diagram that is used for going up at projection screen (screen in other words) embodiment of the image processing module 300 of confirming one or more contact positions, and it can be as the image processing module 230 among Fig. 2.Said infrared image sensor 210 detected picture signals can be transfused to said image processing module 300.As shown in Figure 3, said image processing module 300 comprises AD conversion unit 320, storage unit 322, micro-control unit 324, Flame Image Process and enhancement unit 326 and contact coordinate computing unit 328.When concrete the realization, the program code that is stored in the said storage unit 322 makes said micro-control unit 324 synchronous all other unit catch the one or more contacts on the image with calculating.When operation, said AD conversion unit 320 is a digital picture with the image transitions that receives, and said digital picture can be cached in the said storage unit 322.The view data that said micro-control unit 324 extracts from said storage unit 322, and instigate said Flame Image Process and enhancement unit 326 to be handled according to pre-defined algorithm and strengthen said view data.Said contact coordinate computing unit 328 receives the image after enhancing and the processing, and calculates the coordinate of infrared input or touch.Said result 330 inputs to external device (ED) carrying out subsequent operation, such as the motion of confirming the contact etc.
Fig. 4 shows an example of uniting the infrared pen 400 of use with infrared image sensor.Said infrared pen 400 has handwriting 410.One end of said handwriting 410 has transparent window 420, and the other end has knock-downly uncaps 480.Offer battery space 450 in the said infrared pen; Take said uncapping apart and can the batteries in the battery space 450 taken out or operate the batteries in the battery space 450 after 480, said battery electrically connects with at least one infrared LED 430 through power control circuit 440 and switch 460 on the handwriting 410.Said infrarede emitting diode (IR LED) 430 is positioned at the back of said transparent window 420, and when said infrared LED 430 was launched infrared rays, said infrared ray can outwards be launched through said transparent window 420.Said switch 460 can be controlled the opening and closing of said infrared LED 430.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement etc., all should be included within protection scope of the present invention.
Claims (9)
1. LCOS projection display equipment is characterized in that it comprises:
Screen;
Light engine; It comprises polarization spectroscope and the LCOS device that is positioned at an edge of said polarization spectroscope; Said polarization spectroscope reflexes to said LCOS device with incident light, and said LCOS device generates optical imagery based on the Pixel Information and the incident light modulation of said data image;
Projection lens on optical image projection to the said screen with said light engine generation, and allows to see through from the infrared light of said screen;
Imageing sensor, induction from the infrared light of said projection lens to form sensed image; With
Image processing module, it receives the sensed image from imageing sensor, and determines the coordinate or the position of infrared light based on said sensed image.
2. LCOS projection display equipment as claimed in claim 1 is characterized in that: said projection lens filtering or subdue visible light and the ultraviolet light from screen.
3. LCOS projection display equipment as claimed in claim 1 is characterized in that: said imageing sensor is charge-coupled device (CCD) or cmos sensor.
4. LCOS projection display equipment as claimed in claim 1; It is characterized in that: the side at the projection lens of screen is provided with infrared transmitter; Said infrared transmitter emission infrared light or near infrared light are to the back side of said screen; When said screen was touched, each touches all can reflected infrared to said projection lens.
5. LCOS projection display equipment as claimed in claim 1; It is characterized in that: said screen includes an acryl layer at least; At the edge of acryl layer installing infrared transmitter; The infrared light of said infrared transmitter emission does not stop reflection in acryl layer, but when said screen was touched, IR can be directed to said projection lens from the touch place.
6. LCOS projection display equipment as claimed in claim 1 is characterized in that: when on screen, having a plurality of touch point, each touch point all can form an infrared light, and said infrared light is transmitted to said imageing sensor through said projection lens.
7. LCOS projection display equipment as claimed in claim 1 is characterized in that: when the finger touch screen, its body temperature will make outwards emission infrared light of this finger, and these infrared rays then can be used as the infrared light that touch screen produces.
8. LCOS projection display equipment as claimed in claim 1 is characterized in that: the infrared light that sends when using infrared pen to produce touch screen.
9. the LCOS projection display equipment described in claim 1-8; It is characterized in that: said imageing sensor is placed in another edge of said LCOS device, is reflexed on the said imageing sensor by said polarization spectroscope from the infrared light of said projection lens.
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| CN2009102516061A CN101762956B (en) | 2009-12-28 | 2009-12-28 | LCOS projection display system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102794022A (en) * | 2012-09-07 | 2012-11-28 | 深圳市长江力伟股份有限公司 | Interaction toy based on LCOS (Liquid Crystal On Silicon) micro display technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102411249A (en) * | 2010-09-21 | 2012-04-11 | 上海优熠电子科技有限公司 | One-piece projector with touch function |
| CN102768403A (en) * | 2011-05-03 | 2012-11-07 | 上海美沃精密仪器有限公司 | Micro-display slit system and micro-display slit method |
| CN103369279A (en) * | 2013-02-05 | 2013-10-23 | 深圳市长江力伟股份有限公司 | Spherical equipment with LCOS (liquid crystal on silicon) micro projection function |
| JP6128008B2 (en) * | 2013-08-26 | 2017-05-17 | ソニー株式会社 | Projection display |
| CN106445255A (en) * | 2016-10-21 | 2017-02-22 | 北京仁光科技有限公司 | Light supplementing interaction device and system for rear projection |
| CN108566506B (en) * | 2018-06-04 | 2023-10-13 | Oppo广东移动通信有限公司 | Image processing module, control method, electronic device and readable storage medium |
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|---|---|---|---|---|
| CN101464745A (en) * | 2007-12-17 | 2009-06-24 | 北京汇冠新技术有限公司 | Back projection light source type touch recognition device and method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794022A (en) * | 2012-09-07 | 2012-11-28 | 深圳市长江力伟股份有限公司 | Interaction toy based on LCOS (Liquid Crystal On Silicon) micro display technology |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101762956A (en) | 2010-06-30 |
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