CN103760741A - Touch control projection system - Google Patents
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- CN103760741A CN103760741A CN201410008379.0A CN201410008379A CN103760741A CN 103760741 A CN103760741 A CN 103760741A CN 201410008379 A CN201410008379 A CN 201410008379A CN 103760741 A CN103760741 A CN 103760741A
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Abstract
The invention discloses a touch control projection system which comprises a screen, a light source device, an image acquisition device, a micro-mirror device and a total internal reflection prism arranged in front of the micro-mirror device. The total internal reflection prism has an optical path compensation structure or a hollowed-out channel, after image light rays from the screen penetrate through the total internal reflection prism and are reflected by the micro-mirror device, and the image light rays from the screen can penetrate through the optical path compensation structure or the hollowed-out channel to avoid optical path difference which may be caused by the fact that the image light rays penetrate through the total internal reflection prism. Therefore, the touch control projection system can solve the problem that distortion may occur to touch control images, wherein the touch control images are formed through the fact that the image acquisition device receives the image light rays reflected by the micro-mirror device.
Description
Technical field
The present invention is about a kind of optical projection system, espespecially a kind of touch projection system.
Background technology
Fast, also there is corresponding touch technology in projector in touch-control application development recently.Common touch technology is before screen, to form infrared ray curtain at present, separately in projector, install reception module additional, to receive the image light being formed by this infrared ray curtain, and then the image that analysis user is interdicted this infrared ray curtain is to judge user's touch control operation.In practical application, this reception module can be integrated projection lens design.Image light enters after projector via projection lens, via DMD Digital Micromirror Device (digital micromirror device, DMD), reflexes to image capture unit.In some optical projection system, this DMD Digital Micromirror Device front is still provided with total internal reflection (total internal reflection, TIR) prism, the projection ray that light supply apparatus produces is projected in external screen through this DMD Digital Micromirror Device reflection through this TIR prismatic reflection again, forms projection image.In this configuration, from the image light of screen, will first pass this TIR prism, and through this DMD Digital Micromirror Device, reflect, pass again this TIR prism, just by this image capture unit is received.Due to after this DMD Digital Micromirror Device reflection, the path of image light in TIR prism is different with different travel angle, this,, by making this image capture unit receive the touch-control image possibility distortion that image light forms, causes misjudgment or the inefficacy of touch control operation.
Summary of the invention
The object of the present invention is to provide a kind of touch projection system, the touch-control image that image light that image capture unit receives is formed is undistorted, and then makes touch projection system can correctly judge the touch control operation of user on screen.
In order to achieve the above object, the invention provides a kind of touch projection system, comprise:
Screen;
Light supply apparatus, for launching projection ray;
Image capture unit, in order to receive the image light from this screen;
Micro-mirror device, in order to reflect this projection ray and this image light; And
Total internal reflection prism, comprises:
Body, there is the first side surface, with respect to the second side surface of this first side surface and adjacent to the 3rd side surface and the 4th side surface of this second side surface, this second side surface is just to this micro-mirror device, this projection ray from this light supply apparatus enters this body and penetrates this body from this second side surface from the 3rd side surface, by this micro-mirror device, reflected again, to enter again this body through this second side surface and to penetrate this body to be projected on this screen from this first side surface; And
Optical path compensation structure, be fixedly installed on the 4th side surface, this image light from this screen enters this body and penetrates this body from this second side surface from this first side surface, by this micro-mirror device, reflected again, to enter again this body through this second side surface and to penetrate this body through this optical path compensation structure, to be received by this image capture unit, wherein this image light enters and through this optical path compensation structure, to penetrate the light path that this body passed through identical from this second side surface with diverse location.
Preferably, this optical path compensation structure is outstanding structure, and this optical path compensation structure protrudes from this body and is formed at the 4th side surface.
Preferably, this optical path compensation structure is cylindrical-shaped structure or cone-shaped structure, and the end face of this cylindrical-shaped structure or the bottom surface of this cone-shaped structure are towards this image capture unit, and this image light penetrates this optical path compensation structure from this end face or this bottom surface.
Preferably, this optical path compensation structure is recessed structure, and recessed this body of this optical path compensation structure is also formed at the 4th side surface, and this recessed structure inner side has inner surface, this inner surface is towards this image capture unit, and this image light penetrates this optical path compensation structure from this inner surface.
Preferably, the 3rd side surface is adjacent to the 4th side surface.
The present invention also provides a kind of touch projection system, comprises:
Screen;
Light supply apparatus, for launching projection ray;
Image capture unit, in order to receive the image light from this screen;
Micro-mirror device, in order to reflect this projection ray and this image light; And
Total internal reflection prism, comprises:
Body, there is the first side surface, with respect to the second side surface of this first side surface and adjacent to the 3rd side surface and the 4th side surface of this second side surface, this second side surface is just to this micro-mirror device, and this body comprises hollow out passage, runs through this second side surface and the 4th side surface;
Wherein, this projection ray from this light supply apparatus enters this body and penetrates this body from this second side surface from the 3rd side surface, by this micro-mirror device, reflected again, to enter again this body through this second side surface and to penetrate this body to be projected on this screen from this first side surface; And
This image light from this screen enters this body and penetrates this body from this first side surface, then is reflected by this micro-mirror device, passes this body, to be received by this image capture unit via this hollow out passage from this second side surface to the 4th side surface.
Preferably, this hollow out passage is recessed structure, is positioned at this second side surface and the 4th side surface adjoiner and this second side surface and recessed this body formation of the 4th side surface certainly.
Preferably, this recessed structure has inner surface, this inner surface is with respect to this first side surface and towards this image capture unit, make this this image light from this screen enter this body and penetrate this body from this inner surface from this first side surface, enter this recessed structure, by this micro-mirror device, reflected again, then from this second side surface to the 4th side surface, pass this body via this recessed structure, to be received by this image capture unit.
Preferably, this image light from this screen enters this body and penetrates this body from this second side surface from this first side surface, by this micro-mirror device, reflected again, via this hollow out passage, from this second side surface to the 4th side surface, pass this body, to be received by this image capture unit.
Preferably, the 3rd side surface is adjacent to the 4th side surface.
Compared to prior art, the total internal reflection prism of touch projection system of the present invention has optical path compensation structure or hollow out passage, the optical path difference that may cause when significantly improving or avoiding image light through this total internal reflection prism by this optical path compensation structure or hollow out passage, the touch-control image that image light that this image capture unit receives is formed is undistorted in fact, therefore can correctly judge the touch control operation of user on screen.
Can be by following detailed Description Of The Invention and appended graphic being further understood about the advantages and spirit of the present invention.
Accompanying drawing explanation
The schematic diagram of a kind of touch projection system that Fig. 1 provides for first embodiment of the invention;
Fig. 2 is the schematic diagram of a kind of TIR prism of the touch projection system described in Fig. 1;
Fig. 3 is the schematic diagram of the another kind of TIR prism in touch projection system in Fig. 1;
The schematic diagram of a kind of touch projection system that Fig. 4 provides for second embodiment of the invention;
Fig. 5 is the schematic diagram of a kind of TIR prism of the touch projection system described in Fig. 4;
Fig. 6 is the schematic diagram of the another kind of TIR prism of the touch projection system described in Fig. 4;
Fig. 7 is the schematic diagram of another TIR prism of the touch projection system described in Fig. 4.
Embodiment
Refer to Fig. 1, its schematic diagram that is a kind of touch projection system 1 of providing according to the first embodiment of the present invention.Touch projection system 1 comprises screen 12, light supply apparatus 14, image capture unit 16, micro-mirror device 18, total internal reflection prism 20 and light curtain generation device 22.Light supply apparatus 14 is for launching the PL of projection ray.Image capture unit 16 is in order to receive the image light IL from screen 12.Micro-mirror device 18 forms projection image to be projected to screen 12 in order to reflective projection light PL, and in order to reflected image light IL to be received by image capture unit 16.For example, micro-mirror device 18 can be DMD, but not as limit.TIR prism 20 is arranged at micro-mirror device 18 fronts, and the PL of projection ray that light supply apparatus 14 can be produced reflexes to micro-mirror device 18, and allows that the PL of projection ray that micro-mirror device 18 reflects passes.Light curtain generation device 22 produces light curtain 222 in screen 12 fronts, and image light IL is produced by light curtain 222.In practical application, although image light IL reality is from the light curtain 222 in screen 12 fronts, with regard to the yardstick of installing with regard to whole touch projection system 1, light curtain 222 quite approaches screen 12, this instructions is considered as this image light IL from screen 12, with simplified illustration in logic.
Further, refer to Fig. 2.Fig. 2 is the schematic diagram of TIR prism 20.TIR prism 20 comprises body 202 and optical path compensation structure 204 (its setting is shown in Fig. 1 with dotted line frame table).Body 202 has the first side surface 202a, with respect to the second side surface 202b of the first side surface 202a and adjacent to the 3rd side surface 202c and the 4th side surface 202d of the second side surface 202b, the first side surface 202a is parallel with the second side surface 202b, and the second side surface 202b is just to micro-mirror device 18.Supplementary notes, in Fig. 1, only conceptive the illustrating of travel path of TIR prism 20 and the PL of projection ray and image light IL.In the present embodiment, about the structure explanation of TIR prism 20, take that shown in Figure 2 as Main Basis; Wherein, in Fig. 2, micro-mirror device 18 illustrates with dotted outline, so that understand being oppositely arranged of TIR prism 20 and micro-mirror device 18.The PL of projection ray from light supply apparatus 14 enters body 202 and penetrates body 202 from the second side surface 202b from the 3rd side surface 202c, by micro-mirror device 18, reflected again, to enter again body 202 through the second side surface 202b and to penetrate body 202 to be projected on screen 12 from the first side surface 202a.Optical path compensation structure 204 is fixedly installed on the 4th side surface 202d, image light IL from screen 12 enters body 202 and penetrates body 202 from the second side surface 202b from the first side surface 202a, by micro-mirror device 18, reflected again, to enter again body 202 and to penetrate body 202 through optical path compensation structure 204 through the second side surface 202b, to be received by image capture unit 16; Wherein image light IL is shown in Fig. 2 with band arrow solid line, and the part of being covered by body 202 is represented by dotted lines.Image light IL enters and through optical path compensation structure 204, to penetrate the light path essence that body 202 passed through identical from the second side surface 202b with diverse location.Wherein, aforementioned essence is identical not take identical as necessary, only need in principle the optical path difference of image light IL after optical path compensation structure 204 can control to certain limit, make the unlikely impact of distortion level of the touch-control image of image light IL formation judge the correctness of touch control operation, therefore aforementioned optical path difference is reduced to certain limit, such as can be prior art person, based on product specification (touch-control sensing precision, sensing frequency etc.) and draw via simple experiment, separately not repeating.In the present embodiment, optical path compensation structure 204 is outstanding structures, protrudes from body 202 and is formed at the 4th side surface 202d of body 202.And optical path compensation structure 204 is roughly cylindrical-shaped structure or cone-shaped structure, the bottom surface 204a of the end face of this cylindrical-shaped structure or this cone-shaped structure is towards image capture unit 16.Wherein, this end face or bottom surface 204a and this second side surface 202b are non-parallel face, but the present invention is not as limit.Image light IL is from this end face or bottom surface 204a exit optical path collocation structure 204.By this, the touch-control image that the image light that image capture unit 16 receives forms is undistorted in fact, therefore can correctly judge that user is implemented on the touch control operation on screen 12 based on this touch-control image.
In previous embodiment, optical path compensation structure 204 is to give prominence to structure as example, but the present invention is not as limit.Referring to Fig. 1 and Fig. 3.The schematic diagram of another TIR prism 21 that Fig. 3 provides for the embodiment of the present invention.TIR prism 21 is identical with the setting position of TIR prism 20 in touch projection system 1, thus about TIR prism 21 configuration relation with other members, the configuration that can directly consult TIR prism 20 in Fig. 1, does not separately repeat.In the present embodiment, TIR prism 21 is also roughly the same with TIR prism 20 structures, therefore TIR prism 21 is still continued to use the component symbol of TIR prism 20.TIR prism 21 is that with TIR prism 20 main difference parts the optical path compensation structure 214 of TIR prism 21 is recessed structures, and recessed body 202 is also formed at the 4th side surface 202d of body.This recessed structure inner side has inner surface 214a, but the present invention is not as limit.Wherein, in the present embodiment, this recessed structure comprises the sidewall bodies (for example comprising the part between inner surface 214a to the second side surface 202b) that forms recessed space.Image light IL is from inner surface 214a exit optical path collocation structure 214.Similarly, the touch-control image that the image light that image capture unit 16 receives forms is undistorted in fact, therefore can correctly judge that user is implemented on the touch control operation on screen 12 based on this touch-control image.Supplementary notes, in the present embodiment, roughly rectangular groove structure of this recessed structure, but the present invention is as limit, for example based on image light IL in the distribution of optical path compensation structure 214 travel paths, it is example that this recessed structure is also able to wedge-shaped impression structure.In addition, about other explanations of TIR prism 21, refer to the related description of TIR prism 20, separately do not repeat.
Supplementary notes again, TIR prism 20,21, the three side surface 202c in aforementioned each embodiment are all adjacent to the 4th side surface 202d, but the present invention is not as limit.In practical application, the 3rd side surface 202c and the relativeness of the 4th side surface 202d on body 202 can be determined according to the action of micro-mirror device 18, for example, according to its available reflection direction, design.In this, separately do not repeat.
Aforementioned each embodiment is all to change or the image light IL again travel path in TIR prism 20,21 in of compensation after micro-mirror device 18 reflections, and to solve the problem of known possible optical path difference, but the present invention is not as limit.Refer to Fig. 4, its schematic diagram that is a kind of touch projection system 3 of providing according to a second embodiment of the present invention.Touch projection system 3 comprises screen 32, light supply apparatus 34, image capture unit 36, micro-mirror device 38, total internal reflection prism 40 and light curtain generation device 42.Light supply apparatus 34 is for launching the PL of projection ray.Image capture unit 36 is in order to receive the image light IL from screen 32.Micro-mirror device 38 forms projection image to be projected to screen 32 in order to reflective projection light PL, and in order to reflected image light IL to be received by image capture unit 36.For example, micro-mirror device 18 can be DMD, but not as limit.TIR prism 40 is arranged at micro-mirror device 38 fronts, and the PL of projection ray that light supply apparatus 34 can be produced reflexes to micro-mirror device 38, and allows that the PL of projection ray that micro-mirror device 38 reflects passes.Light curtain generation device 42 produces light curtain 422 in screen 32 fronts, and image light IL is produced by light curtain 422.In practical application, although image light IL reality is from the light curtain 422 in screen 32 fronts, with regard to the yardstick of installing with regard to whole touch projection system 3, light curtain 422 quite approaches screen 32, this instructions is considered as this image light IL from screen 32, with simplified illustration in logic.
Further, refer to Fig. 5.Fig. 5 is the schematic diagram of a kind of TIR prism 40 of the touch projection system shown in Fig. 4.TIR prism 40 comprises body 402.Body 402 has the first side surface 402a, with respect to the second side surface 402b of the first side surface 402a and adjacent to the 3rd side surface 402c and the 4th side surface 402d of the second side surface 402b, the second side surface 402b is just to micro-mirror device 38.Body 402 also comprises hollow out passage 404 (its setting is shown in Fig. 4 with dotted line frame table), runs through the second side surface 402b and the 4th side surface 402d.Supplementary notes, in Fig. 4, only conceptive the illustrating of travel path of TIR prism 40 and the PL of projection ray and image light IL.In the present embodiment, about the structure explanation of TIR prism 40, take that shown in Figure 5 as Main Basis; Wherein, in Fig. 5, micro-mirror device 38 illustrates with dotted outline, so that understand being oppositely arranged of TIR prism 40 and micro-mirror device 38.The PL of projection ray from light supply apparatus 34 enters body 402 and penetrates body 402 from the second side surface 402b from the 3rd side surface 402c, by micro-mirror device 38, reflected again, to enter again body 402 through the second side surface 402b and to penetrate body 402 to be projected on screen 32 from the first side surface 402a.Image light IL from screen 32 enters body 402 and penetrates body 402 from the second side surface 402b from the first side surface 402a, by micro-mirror device 38, reflected again, to pass body 402 via hollow out passage 404 from the second side surface 402b to the four side surface 404d, to be received by image capture unit 36; Wherein image light IL is shown in Fig. 2 with band arrow solid line, and the part of being covered by body 402 is represented by dotted lines.Because the image light IL after micro-mirror device 38 reflection is no longer through the entity of body 402, therefore do not have the problem of known optical path difference, that is the touch-control image that the image light that receives of image capture unit 36 forms is undistorted in fact, therefore can correctly judge that user is implemented on the touch control operation on screen 32 based on this touch-control image.
Supplementary notes, in practical application, the impact on the normal projection of the PL of projection ray need be considered in the position that this hollow out passage 404 forms in body 402, avoids interfering the travel path of the PL of projection ray in TIR prism 40.This factor is considered as prior art person is based on this instructions, through simple designs, test and can meet easily, in this, does not separately repeat.In addition, though the image light IL after micro-mirror device 38 reflection not entity through body 402, really still through the occupied single solid space of body 402 (or call the space that its outermost profile surrounds, or the required space that arranges).Therefore, in the broadest sense, hollow out passage 404 is similar to aforementioned optical path compensation structure 204 technical logics, all adopts the technological thought that overcomes the optical path difference problem that image light IL may cause through body 202,402 with structure.
In addition, in the present embodiment, hollow out passage 404 is example with the conial channel (opening in the second side surface 402b is less, larger in the opening of the 4th side surface 402d) that connects the second side surface 402b and the 4th side surface 402d, but the present invention is not to be limited.Referring to Fig. 4 and Fig. 6.Fig. 6 is the schematic diagram of the another kind of TIR prism 41a of touch projection system as shown in Figure 4.TIR prism 41a is identical with the setting position of TIR prism 40 in touch projection system 3, therefore about the configuration relation of TIR prism 41a and other members, the configuration that can directly consult TIR prism 40 in Fig. 4, does not separately repeat.In the present embodiment, TIR prism 41a and TIR prism 40 structures are also roughly the same, therefore TIR prism 41a still continues to use the component symbol of TIR prism 40.TIR prism 41a and TIR prism 40 main difference parts are that the hollow out passage 414a of TIR prism 41a is recessed structure (or meaning fluting), are positioned at the second side surface 402b and the 4th side surface 402d adjoiner and form from the second side surface 402b and the recessed body 402 of the 4th side surface 402d.This hollow out passage 414a is suitable with hollow out passage 404 structures, but hollow out passage 414a is shaped conveniently compared with hollow out passage 404.Similarly, image light IL after micro-mirror device 38 reflections passes body 402 via hollow out passage 414a, the touch-control image that the image light that image capture unit 36 receives forms is undistorted in fact, therefore can correctly judge that user is implemented on the touch control operation on screen 32 based on this touch-control image.What remark additionally is, in practical application, based on image light IL, in the distribution of hollow out passage 414a travel path, it is example that this recessed structure (being hollow out passage 414a) is able to wedge-shaped impression structure, is not limited in the present embodiment take rectangular groove structure roughly as example.
In addition, in the present embodiment, image light IL enters after body 402 from the first side surface 402a, still from the second side surface 402b, penetrates body 402 and is reflected by micro-mirror device 38, then passing body 402 via hollow out passage 414a.But the present invention is not as limit.Referring to Fig. 4 and Fig. 7.Fig. 7 is the schematic diagram of another TIR prism 41b of touch projection system as shown in Figure 4.TIR prism 41b is identical with the setting position of TIR prism 40 in touch projection system 3, therefore about the configuration relation of TIR prism 41b and other members, the configuration that can directly consult TIR prism 40 in Fig. 4, does not separately repeat.In the present embodiment, TIR prism 41b and TIR prism 41a structure are also roughly the same, therefore TIR prism 41b still continues to use the component symbol of TIR prism 41a.TIR prism 41b and TIR prism 41a main difference part are that the recessed structure (being hollow out passage 414b) of TIR prism 41b has the darker degree of depth, this recessed structure has inner surface 414c, this inner surface 414c is with respect to the first side surface 402a and towards image capture unit 36, make to enter body 402 and penetrate body 402 from inner surface 414c from the first side surface 402a from the image light IL of screen 32, enter this recessed structure (being hollow out passage 414b), by micro-mirror device 38, reflected again, via this recessed structure, from the second side surface 402b to the four side surface 402d, pass body 402 again, to be received by image capture unit 36.Similarly, the touch-control image that the image light that image capture unit 36 receives forms is undistorted in fact, therefore can correctly judge that user is implemented on the touch control operation on screen 32 based on this touch-control image.Supplementary notes, in practical application, inner surface 414c is parallel with the first side surface 402a.In addition, TIR prism 40,41a, 41b in aforementioned each embodiment, the 3rd side surface 402c is all adjacent to the 4th side surface 402d, but the present invention is not as limit.In practical application, the 3rd side surface 402c and the relativeness of the 4th side surface 402d on body 402 can be determined according to the action of micro-mirror device 38, for example, according to its available reflection direction, design.In this, separately do not repeat.
As above stated specification, the total internal reflection prism of touch projection system of the present invention has optical path compensation structure or hollow out passage, the optical path difference that may cause when significantly improving or avoiding image light through this total internal reflection prism by this optical path compensation structure or hollow out passage, the touch-control image that image light that this image capture unit receives is formed is undistorted in fact, therefore can correctly judge the touch control operation of user on screen.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the claims in the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. a touch projection system, is characterized in that, comprises:
Screen;
Light supply apparatus, for launching projection ray;
Image capture unit, in order to receive the image light from this screen;
Micro-mirror device, in order to reflect this projection ray and this image light; And
Total internal reflection prism, comprises:
Body, there is the first side surface, with respect to the second side surface of this first side surface and adjacent to the 3rd side surface and the 4th side surface of this second side surface, this second side surface is just to this micro-mirror device, this projection ray from this light supply apparatus enters this body and penetrates this body from this second side surface from the 3rd side surface, by this micro-mirror device, reflected again, to enter again this body through this second side surface and to penetrate this body to be projected on this screen from this first side surface; And
Optical path compensation structure, be fixedly installed on the 4th side surface, this image light from this screen enters this body and penetrates this body from this second side surface from this first side surface, by this micro-mirror device, reflected again, to enter again this body through this second side surface and to penetrate this body through this optical path compensation structure, to be received by this image capture unit, wherein this image light enters and through this optical path compensation structure, to penetrate the light path that this body passed through identical from this second side surface with diverse location.
2. touch projection system as claimed in claim 1, is characterized in that, this optical path compensation structure is outstanding structure, and this optical path compensation structure protrudes from this body and is formed at the 4th side surface.
3. touch projection system as claimed in claim 2, it is characterized in that, this optical path compensation structure is cylindrical-shaped structure or cone-shaped structure, the end face of this cylindrical-shaped structure or the bottom surface of this cone-shaped structure are towards this image capture unit, and this image light penetrates this optical path compensation structure from this end face or this bottom surface.
4. touch projection system as claimed in claim 1, it is characterized in that, this optical path compensation structure is recessed structure, recessed this body of this optical path compensation structure is also formed at the 4th side surface, this recessed structure inner side has inner surface, this inner surface is towards this image capture unit, and this image light penetrates this optical path compensation structure from this inner surface.
5. touch projection system as claimed in claim 1, is characterized in that, the 3rd side surface is adjacent to the 4th side surface.
6. a touch projection system, is characterized in that, comprises:
Screen;
Light supply apparatus, for launching projection ray;
Image capture unit, in order to receive the image light from this screen;
Micro-mirror device, in order to reflect this projection ray and this image light; And
Total internal reflection prism, comprises:
Body, there is the first side surface, with respect to the second side surface of this first side surface and adjacent to the 3rd side surface and the 4th side surface of this second side surface, this second side surface is just to this micro-mirror device, and this body comprises hollow out passage, runs through this second side surface and the 4th side surface;
Wherein, this projection ray from this light supply apparatus enters this body and penetrates this body from this second side surface from the 3rd side surface, by this micro-mirror device, reflected again, to enter again this body through this second side surface and to penetrate this body to be projected on this screen from this first side surface; And
This image light from this screen enters this body and penetrates this body from this first side surface, then is reflected by this micro-mirror device, passes this body, to be received by this image capture unit via this hollow out passage from this second side surface to the 4th side surface.
7. touch projection system as claimed in claim 6, is characterized in that, this hollow out passage is recessed structure, is positioned at this second side surface and the 4th side surface adjoiner and this second side surface and recessed this body formation of the 4th side surface certainly.
8. touch projection system as claimed in claim 7, it is characterized in that, this recessed structure has inner surface, this inner surface is with respect to this first side surface and towards this image capture unit, make this this image light from this screen enter this body and penetrate this body from this inner surface from this first side surface, enter this recessed structure, by this micro-mirror device, reflected again, via this recessed structure, from this second side surface to the 4th side surface, pass this body again, to be received by this image capture unit.
9. touch projection system as claimed in claim 6, it is characterized in that, this image light from this screen enters this body and penetrates this body from this second side surface from this first side surface, by this micro-mirror device, reflected again, via this hollow out passage, from this second side surface to the 4th side surface, pass this body, to be received by this image capture unit.
10. touch projection system as claimed in claim 6, is characterized in that, the 3rd side surface is adjacent to the 4th side surface.
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