TWI359283B - Optical system for stereo projection - Google Patents

Description

1359283 loo year. November οι day nuclear replacement π, invention description: [Technical field of invention] [〇〇〇1] The present invention relates to a projection optical system, in particular to a stereoscopic projection optical system having a stereoscopic projection display function . [Prior Art] [0002] In recent years, image projectors, especially digital projectors, have become popular as tools for displaying a variety of messages to viewers. Typically, these projectors are used to project a computer generated image onto a screen. For the viewer, the image projected by the image projector usually looks like a flat two-dimensional image, and no image depth of field information can be displayed except the image itself. This display can be used to display a variety of messages. However, in some cases, the viewer desires to have a projector that can display the depth of field or structural features of the image to a greater extent than the two-dimensional display. One way to enable an image of a two-dimensional display to give an image depth of field is by displaying the image in a stereoscopic manner. Stereoscopic images, often referred to as "three-dimensional" or "3D" images, have a depth dimension to the viewer. These images include separate, superimposed left and right eye images that are arranged to mimic the slight difference in the surface of a three-dimensional object caused by the spacing of the human eye when viewed from the left and right eyes of the person. . The images of the left and right eyes are such that the viewer's right eye does not see the left eye image * the left eye does not see the right eye image. This type of display is generally by means of an optical filter worn by the viewer. [0004] A method of displaying a stereoscopic image generally uses two separate image projection systems to project a left eye image and a right eye image, respectively. While this system is successfully used to form stereo images, the cost and weight of the system is more than single 096136364 Form No. 1010101 Page 4 / Total 25 Page 1003403731-0 1,359283 Correction 1100 11j 01 Projection The instrument is much higher. Moreover, the two projectors require optical alignment to be relatively difficult and time consuming. Also, due to the weight and volume of the two systems, it is particularly difficult to move such a system between two positions, and there is also the problem of potential image alignment. SUMMARY OF THE INVENTION [0005] In view of the above, it is necessary to provide a single stereoscopic projection optical system capable of projecting a stereoscopic image. [0006] A stereoscopic projection optical system comprising: sequentially arranged along an optical path: [0007] an imaging engine for emitting red, green, and blue light respectively loaded with image information, the red and blue light being Linearly polarized light having a P-polarized state, the green light being linearly polarized light having an S-polarized state; [0008] a specific wavelength polarization conversion element that receives the red, green, and blue light and polarizes the green light according to a wavelength a state in which the state is converted to a p-polarized state to maintain a polarization state of the red and blue light; and a transmissive light modulation H for receiving the red, green, and blue light passing through the special long-wavelength polarization conversion element, the transmissive light The modulator has two (four) working states of opening and closing, "when the transparent shafting device is in an open state, the red, green and blue light maintain a 3-polarized state through the transmissive optical modulation, the transmissive When the light modulator is in the off state, the polarization state of the 'light 4 light and blue light is converted into the p-polarized state through the 3 hai 5 hai transmission light modulator. 096136364 Compared with the prior art, the stereoscopic projection described above Optical line (4) By means of the penetrating wire, the material light modulator has two alternating working states of opening and closing, so that the viewer's left, form number Α 0101, page 5 / total 25 pages 1003403731-0 [0010] 1359283 100 years. On November 1st, the image of the different polarization states is alternately replaced by the right eye of the mu. When the frequency of the input signal is fast enough, the left and right eyes of the viewer respectively wear two polarizing plates whose detection directions are perpendicular to each other. The stereoscopic image information can be observed. [Embodiment] [0012] The following preferred embodiments will be described in detail below with reference to the accompanying drawings. [0012] Please refer to FIG. A schematic diagram of the stereoscopic projection optical system 100 of the first embodiment. The stereoscopic projection optical system 100 includes a light source element 11, a first and a second beam splitter 12a, 12b, a plurality of mirrors 13, and three in sequence along the optical path. The transmissive spatial light modulators 14R, 14G, and 14B respectively disposed corresponding to the plurality of mirrors 13 and the combined light disposed in the direction of the outgoing light of the transmissive spatial light modulators 14R, 14G, and 14B a prism 16 , a polarization conversion element 15 disposed between the transmissive spatial light modulator 14G and the combining aperture 16 , a polarization conversion component 17 and a specific wavelength disposed in the direction of the outgoing light of the combining aperture 16 The transmissive light modulator 18, and a projection lens 19. [0013] In the present embodiment, the light source element 11, the first and second beam splitters 12a, 12b, the plurality of mirrors 13 Three transmissive spatial light modulators 14R, 14G, 15B, a polarization conversion element 14 and a light combining prism 16 together form an imaging engine that emits light loaded with image information. [0014] The light source assembly 11 includes an illumination source 111, an integrator 112, and a polarization converter 113 disposed in accordance with the optical path. The illumination source 111 emits white light including red (R), green (G), and blue (B) required to display a color image. The light source 11 can be a halogen lamp, a metal halide lamp or a xenon lamp 096136364 Form No. A0101 Page 6 of 25 1003403731-0 1,359283

100 years.11. On the 01st of the month, the shuttle is replacing the page. In this embodiment, the light source 11 is an i-lamp. The integrator 112 is used to homogenize and effectively use the light emitted by the light source 11. The polarization converter 113 is for converting incident white light into light of the same polarization state. In the present embodiment, the polarization converter 113 converts incident white light into S-polarized light, and outputs the S-polarized white light as outgoing light. [0015] The first beam splitter 12a is configured to separate the blue light B out of the light emitted from the polarization converter 113, and reflect the separated blue light B to transmit the mixed light mixed with the red light R and the green light G. . [0016] The second beam splitter 12b is configured to separate the mixed light of the red light R and the green light G, which is emitted by the first beam splitter 12a, into red light R and green light G, and reflect the separated green light G. And transmits red light R. [0017] The plurality of mirrors 13 are respectively disposed between the transmissive spatial light modulators 14R, 14G, 14B and the first and second beam splitters 12a, 12b for using the first and second beam splitters The red light R, the green light G, and the blue light B emitted from 12a, 12b are coupled into the corresponding through-space light modulators 14R, 14G, 14B. [0018] The working principles of the transmissive spatial light modulators 14R, 14G, and 14B are all the same. The working principle of the transmissive spatial light modulator 14R is exemplified below. [0019] The transmissive spatial light modulator 14R may be a liquid crystal display device (LCD). The transmissive spatial light modulator 14R modulates the incident light by controlling the polarization state of the input light and adds an image message to the incident light to form modulated modulated light including the image information. The image message may be 096136364 of the transmissive spatial light modulator 14R Form No. A0101 Page 7 of 25 1003403731-0 1359283 100. November 01 Shuttle is replacing w Loading control signal Voltage, the control signal voltage directly controls the switch-like cancer of the thin film transistor. The thin film transistor is used to control the deflection state of the liquid crystal dice, and the liquid crystal molecules have obvious optical anisotropy and can control the incident light. Light, which achieves the purpose of loading image signals into incident light. In this embodiment, the transmissive spatial light modulator 14R modulates incident S-polarized light and superimposes an image message on the S-polarized light to generate an outgoing light including an image message. That is, P-polarized light with image information is included.

[0020] Similarly, the transmissive spatial light modulators 14G, 14B respectively emit green light G and blue light B in a P-polarized state in which image information is superimposed. [0021] The polarization conversion element 15 is disposed between the optical path of the transmissive spatial light modulator 14G and the combining aperture 16 for P-polarization state of the transmissive spatial light modulator 14G. The green light G is converted into the green light G of the S-polarized state to pass through the light combining prism 16. The polarization conversion element 15 may be an organic film having optical anisotropy obtained by a method such as stretching. It is divided into a half wave plate and a quarter wave plate. When the beam passes through the half-wave plate, the vibration direction of the beam is rotated by 90 degrees only once, and for the quarter-wave plate, the beam is repeated twice after the quarter-wave plate. The direction of vibration is rotated by 90 degrees. In the present embodiment, the polarization conversion element 15 used is a half-wave plate which can be formed by superposing two quarter-wave plates. [0022] The light combining aperture 16 has a function of mixing colored light of a predetermined polarization component to emit the mixed colored light. The light combining aperture 16 has three incident faces and an exit face. The light combining prism 16 is an optical component having two planes perpendicular to each other, i.e., a first plane 161 and a second plane 162. 096136364 Form No. A0101 Page 8 of 25 1003403731-0 1,359283 100. Year 11.11. 〇l·日惨正静页] The first plane 161 is a dichroic filter, the two directions The color filter is configured to transmit light having a first wavelength and to reflect light having a second wavelength, in the present embodiment, transmitting green light G, reflecting blue light B. Similarly, the second plane 162, which is perpendicular to the first plane 161, also has a dichroic sheeting that transmits green light G and reflects red light R. Of course, it can be understood that the combined aperture 16 also has the function of separating the light of different polarization directions from the general polarization beam splitter. [0023] The specific wavelength polarization conversion element 17 is a laminate composed of a plurality of retardation films, which can convert a polarized light of a specific frequency band, that is, a polarized light of a specific wavelength, into a frequency band orthogonal thereto without loss. The wavelength polarization conversion element 17 can convert the polarization directions of incident light of any color in a certain wavelength band, such as red light r, green light G, and blue light B, into polarized outgoing light orthogonal thereto. In this embodiment, the specific wavelength polarization conversion element 17 is used to convert the polarization direction of the incident green light G into the polarized light outgoing green light G orthogonal thereto, and the other colors such as the red light R and the blue light β are directly By passing, its polarization direction does not deflect. [0024] The transmissive optical modulator 18 is disposed on the outgoing optical path of the polarization conversion element 17 of the specific wavelength. The transmissive light modulator 18 can be a liquid crystal display (LCD). The turn-on and turn-off of the transmissive optical modulator 18 is controlled by inputting a pulse signal to the transmissive optical modulator 18. As shown in Fig. 3, the input signal of the input transmissive optical modulator 18 and the waveform of the polarization state of the output light with respect to the left and right eyes are shown. In this embodiment, the transmissive optical modulator 18 is turned on or off according to the input signal waveform diagram shown in FIG. 3, thereby alternately providing S-polarized light and P-polarized light with different polarization directions for the left and right eyes. Transmissive light modulator 096136364 Form No. A0101 Page 9 / Total 25 pages 1003403731-0 1359283 When the input of the signal is input by the Ol·Riso controller 18 in November 1100, the transmissive light modulator 18 can be alternately output. S-polarized or P-polarized light to provide light of different polarization directions of the left and right eyes of the viewer. It can be understood that the period of the input signal can be adjusted. The polarization direction of the input polarized light can be controlled by the opening and closing of the transmissive light modulator 18. In the present embodiment, the P-polarized light of the transmissive optical modulator 18 is input, and the p-polarized light is taken as an example. The principle of operation of the transmissive optical modulator 18 will be described. Of course, it is conceivable that the effect on the s-polarized light is the same as that of the P-polarized light. [0025] When the s-through transmissive light modulator 18 is turned on, as shown in FIG. 1, the p-polarized light directly passes through the s-through light modulator 18 without a sense of polarization of the p-polarized light. Make modulation. However, when the transmissive optical modulator 丨8 is turned off, as shown in FIG. 2, the p-polarized light that passes through is modulated, that is, the input p-polarized light is modulated into an S-polarized light output, thereby alternately Provides light of different polarization directions for the left and right eyes of the viewer.

[0026] It can be understood that, in order to further improve the contrast of the system, a polarizing plate 2 can be added to the above-mentioned stereoscopic projection optical system. As shown in FIG. 4, the polarizing plate 20 can pass light of a certain polarization direction. While absorbing light of other polarization directions, for example, passing p-polarized light, absorbing 5 polarized light or passing S-polarized light, and absorbing p-polarized light. The polarizer is disposed between the specific wavelength polarization conversion element 17 and the light modulator 18.

5 is a schematic structural diagram of a projection optical system 200 according to a second embodiment of the present invention. The stereoscopic projection optical system 2 includes a light source assembly 21 disposed in the optical path direction. The second beam splitter 22a 22b' a mirror 23, three polarization beam splitters 24r, 24G, 24B, three respectively corresponding to the polarization beam splitters 24R, 24G, 24B are set 096136364 Form No. A0101 Page 1 / A total of 25 pages of 1003403731-0 100 years. 11th of January 1st, the correction of the reflective spatial light modulators 25R, 25G, 25Β ' is set in the direction of the light emitted by the reflective inter-planar light modulators 25R, 25G, 25 The light combining edge cy cy ' is a polarization conversion element 27 disposed between the transmissive spatial light modulator 25G and the light combining prism 26, and a specific wavelength polarization conversion element 28 disposed in the direction of the outgoing light of the light combining prism 26. And a transmissive optical modulation state 29, and a projection lens 202. [0028] The 坌-Feihe tribute example differs from the first embodiment in that the composition of the imaging engine is different, and the optical components in the second embodiment are reflective spatial light φ modulators 25R, 25G, 25B, The reflective spatial light modulators 25R, G 25B may be Liquid Crystal on Sil- ic (n' LC 〇 S) display panels. The image information superimposed by the reflective spatial light modulators 25R, 25G, and 25B may be a control signal voltage loaded by the LC〇s. The control signal voltage directly controls the switching state of the thin film transistor. The crystal controls the deflection state of the liquid crystal molecules, and the liquid crystal molecules have obvious optical anisotropy, and can control the light from the incident light, thereby achieving the purpose of loading the image signal into the incident light. [0029] In addition, since the optical elements used for superimposing the image information of the projection beam are the reflective spatial light modulators 25R, 25G, and 25B, the optical path propagation of the reflective spatial light modulators 25R, 25G' 25B is matched, correspondingly Three polarization beam splitters 24R, 24G, 24B are provided. The polarizing beam splitters 24R, 24G, and 24B pass incident light of the corresponding reflective spatial light modulators 25R, 25G, and 25B, and are reflected by the reflective spatial light modulator 25R,

25G, 25B modulated light. In the present embodiment, the S-polarized light passes through the respective polarization beam splitters 24R, 24G, 24B to the reflective modulator 25R 096136364. Form No. A0101 Page 11 of 25 Page 1003403731-0 1359283 loo Year 11.11. After the correction of the ridges, 25G, 25B, 'after the modulation by the reflection modulators 25R, 25G, 25B', the S-polarized light becomes P-polarized light, and the polarization beam splitter reflects the p-polarized light, thereby making the superposition The red light r, the green light G, and the blue light b having the image information are incident on the combined light 稜鏡 26. The polarization beam splitter 24R, 24G, 24B may be one of a metal grid polarizer (WGP polarizer) and a polarization beam splitter. [0030] It can be understood that the red light R, The transmission optical paths of the green light G and the blue light B in other optical components such as the specific wavelength polarization conversion element 28 are the same as in the first embodiment. [0031] Similarly, in order to further improve the contrast of the system, the stereoscopic shape in the second embodiment can also be used. A polarizing plate 2 is added to the projection optical system 200, and its setting position is the same as that of the first embodiment. [0032] Please refer to FIG. 6, which is a schematic structural diagram of a projection optical system 300 according to a third embodiment of the present invention. . The imaging optical system of the projection optical system 300 includes a light source assembly 31 disposed along the optical path, a blue light polarization conversion element 32B for converting a polarization direction of the blue light b, and two red light polarizations for converting the polarization direction of the red light R. Conversion element 32R, four polarization beam splitters 33a ®

'33b, 33c, 33d, three reflective spatial light modulators 34R, 34B, 34G. In the first and second embodiments, the projection optical system 3A also includes a specific wavelength polarization conversion element 35, a polarizing plate 37 disposed on the optical path of the specific wavelength polarization conversion element 35, and a transmissive light. Modulator 36 and a projection lens 38 » [0033] The blue polarization conversion element 32B and the red polarization conversion element 32R and the specific wavelength polarization conversion element 第一7 of the first embodiment structure and operation principle 096136364 Form No. A0101 No. 12 Page / Total 25 pages 1003403731-0 1.359283 _ a _ 100 years. November 01 correction for the gj-page like 'the only difference is that the blue polarization conversion element 32B and the red polarization conversion element 32R respectively will be incident blue light B and red light R are converted into light perpendicular to their polarization state and emitted. [0034] The structure and working principle of other optical components have been stated in the first and second embodiments, and the optical path traveled by the light beam in FIG. 6 and the listed optical components are not described herein. The role played is explained. [0035] When the S-polarized light emitted by the light source 31 passes through the blue polarization conversion element 32B, the polarization direction of the blue light B corresponding to the light source is converted, that is, converted into p-polarized light. The P-polarized blue light B passes through the two polarization beam splitters 333 and 33b to the reflective spatial light modulator 34B, is modulated by the reflective spatial light modulator 34B, and emits s-polarized light loaded with a picture image. . The blue light B of 5 polarization is reflected by the polarization beam splitters 33b and 33c and then exits. Here, it is to be noted that the 'polarizing beam splitter 33c is disposed on the optical path of the outgoing light of the polarization beam splitters 33b, 33d. The red light r or the green light g which is not polarized by the blue polarization conversion element 32B is still in the S polarization state and reaches the polarization beam splitter 33a, and is reflected by the polarization beam splitter _ 33a. The polarization beam splitter 33d is disposed on the optical path of the reflected light of the polarization beam splitter 33a and is provided with a red light polarization conversion element 3 2R between the polarization beam splitters 338 and 33 (1 to be s-polarized red The light R is converted into a P-polarized red light R, thereby passing through the polarization beam splitter 33d to the reflective spatial light modulator 34R. ^ The red light R is modulated by the reflective spatial light modulator 34R and reflected and loaded with image information. The red light r, that is, the red light of 5 polarization. The polarization beam splitter 33c is disposed on the optical path of the polarizing beam splitter 33 (wherein the light beam is emitted, and red is disposed between the polarization beam splitters 33c and 33d). The light polarization conversion element 32R converts the red light R in the S polarization to the red polarization 096136364. Form No. A0101 Page 13 of 25 Innq 1359283 100.11-Month 01 Shuttle Positive® ΐίπ Light R, Thereby, it is emitted through the polarization beam splitter 33c. [0037] The polarization conversion green light G is not reflected by the polarization beam splitter 33d by the red polarization conversion element 32R to the reflective spatial light modulator 34G. The reflective spatial light modulator 34G modulates green light G and reflects the green light G ' loaded with image information P-polarized green light (j. The p-polarized green light g is transmitted through the polarization beam splitters 33c, 33d and the specific wavelength polarization conversion element 32R. [0038] It can be understood that here the blue light B and red The positions of the blue polarization conversion element 32B and the red polarization conversion element 32R for which the light R is polarization-converted may be interchanged, and may also be polarization conversion of the green light G. Of course, when the blue light B and the red light R are polarization-converted blue light After the positions of the polarization conversion element 32B and the red polarization conversion element 32R are interchanged, the positions of the corresponding reflective spatial light modulators 34B, 34R also need to be interchanged. [0039] The specific wavelength polarization conversion element 35, the polarizer 37 and the penetration The effect of the mode light modulator 36 on the P-polarized red light R, the green light G, and the S-polarized blue light B emitted from the polarization beam splitter 33c and the transmission optical path are the same as in the first and second embodiments. The stereoscopic projection optical system described above can be used to input signals to the transmissive optical modulator such that the transmissive optical modulator has two alternating working states of turning on and off 'making the viewer's left and right.艮Alternatively obtaining images of different polarization states. When the frequency of the input signal is fast enough, the left and right eyes of the viewer wear two polarizing plates perpendicular to each other to detect the stereoscopic image information. [0041 In summary, the invention conforms to the patent requirements of the invention, and the patent is filed according to law 1003403731-0 096136364 Form No. A0101 Page 14/Total 25 Page 1.359283 10 0.11.月01日梭正_Page application. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention should be covered. It is within the scope of the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS [0042] FIG. 1 is a schematic view showing the structure of a stereoscopic projection optical system according to a first embodiment of the present invention when the transmissive optical modulator is turned on.

2 is a schematic structural view of the stereoscopic projection optical system of FIG. 1 when the transmissive optical modulator is turned off. 3 is a waveform diagram of input signals of the transmissive optical modulator of FIG. 1 and polarization states of light outputted with respect to the left and right eyes. 4 is a schematic view showing the structure of one polarizing plate provided in the stereoscopic projection optical system of FIG. 1. 5 is a schematic structural view of a stereoscopic projection optical system according to a second embodiment of the present invention. 6 is a schematic structural view of a stereoscopic projection optical system according to a third embodiment of the present invention. [Main component symbol description] [0048] Stereoscopic projection optical system: 100, 200, 300 [0049] Light source component: 11, 21, 31 [0050] Illumination light source: 111 [0051] Color wheel: 112 096136364 Form No. A0101 15 pages / total 25 pages 1003403731-0

1359283 100 years. 11.1 month 1 nuclear replacement replacement [0052] integrator: 113 [0053] Mirror: 13, 23 [0054] Polarization conversion element: 15, 27 [0055] Light combining prism: 16, 26 [ 0056] Projection lens: 19, 202, 38 [0057] Polarizer: 20, 2 (Π, 37 [0058] First and second beamsplitters: 12a, 12b, 22a ' 22b Λ [0059] Transmissive spatial light Modulator: 14R, 14B, 14G [0060] Polarization beam splitter: 24R, 24B, 24G, 33a, 33b, 33c, 33d [0061] Reflective spatial light modulator: 25R, 25B, 25G '34R, 34B, 34G First and second planes: 161, 162 [0063] Specific wavelength polarization conversion elements: 17, 35 [0064] Transmissive light modulators: 18, 29, 36 1 [0065] Blue light polarization conversion elements: 32B [0066] Red Light Polarization Conversion Element: 32R 096136364 Form No. A0101 Page 16 of 25 1003403731-0

Claims (1)

• 100 years.11.月01日赃Page application patent scope: A stereoscopic projection optical system, comprising: an imaging engine for emitting red, green and blue light respectively loaded with image information, the red light And blue light is linearly polarized light having a p-polarized state, the green light is linearly polarized light having an S-polarized state; - a specific wavelength polarization conversion element for receiving the red, green, and blue light and illuminating the green light according to a wavelength a polarization state is converted to a P-polarization state to maintain a polarization state of the red and blue light; and a transmissive optical modulator is configured to receive the red, green, and blue light passing through the polarization conversion component of the specific wavelength, the wearing The transmissive light modulator has two alternating working states of turning on and off. When the penetrating optical modulator is in an on state, the red, green and blue light maintain a 3-polarized state through the transmissive light modulator. When the transmissive light modulator is in an off state, the polarization states of the red, green and blue light are converted into a p-polarized state through the transmissive light modulator. The stereoscopic projection optical system of claim 1, wherein the imaging engine comprises: a light source assembly for emitting an outgoing light having an s-polarized state, and is disposed on an outgoing light path of the light source assembly for emitting light The first and second beamsplitters separated into red, green and blue light, and three transmissive spatial light modulators disposed on the first-second dichotom exiting light path, respectively, and transmissive spatial light The reflector corresponding to the modulator is a combined aperture disposed in the direction of the light emitted by the transmissive spatial light modulator, and a polarization conversion element disposed between the transmissive spatial light modulator and the light combining prism. The stereoscopic projection optical system as described in claim 2, wherein 1003403731-0 form number is deleted i * 17 I/# 25 f 1359283 1 November 1100 revised replacement food transmissive spatial light modulation The device is a liquid crystal display device. 4. The stereoscopic projection optical system according to claim 1, wherein the imaging engine includes a light source assembly for emitting an outgoing light having an S-polarized state, and is disposed on the light path of the light source assembly for emitting light. The first and second beam splitters are separated into red, green and blue light, three polarization beam splitters respectively arranged on the first and second beamsplitter exit light paths, and three polarization beam splitters respectively Correspondingly disposed reflective spatial light modulator, a light combining prism disposed in the direction of the outgoing light of the reflective spatial light modulator, and a polarization conversion element disposed between the transmissive spatial light modulator and the light combining prism 5. The stereoscopic projection optical system of claim 4, wherein the polarization beam splitter is a polarization splitter. 6. The stereoscopic projection optical system according to claim 4, wherein the polarizing beam splitter is a metal grid type polarizing plate. 7. The stereoscopic projection optical system according to claim 1, Wherein, the imaging engine comprises a light source element arranged in sequence along the optical path, a blue light polarization conversion element for converting a polarization direction of the blue light, and two red light polarization conversion elements for converting the polarization direction of the red light, and the four are sequentially disposed on The blue light polarization conversion element, the polarization beam splitter of the red light polarization conversion element, and three reflective spatial light modulators respectively disposed corresponding to the blue light polarization conversion element and the red light polarization conversion element. 8. The stereoscopic projection optical system according to claim 7, wherein the polarization beam splitter is a polarization beam splitting prism. 9. The stereoscopic projection optical system according to claim 7, wherein the polarizing beam splitter is a metal grid type polarizing plate. 10 . The stereoscopic projection optical according to claim 4 or 7. System, wherein 096136364 Form No. 101 0101 Page 18 / Total 25 Page 1003403731-0 1359283 10 0. 11. On January 01, the reflective spatial light modulator is a 矽-based liquid crystal panel. The stereoscopic projection optical system of claim 1, wherein the stereoscopic projection optical system further comprises a projection lens disposed in an outgoing light direction of the transmissive optical modulator for outputting The image formed by the light is magnified. 096136364 Form No. A0101 Page 19 of 25 1003403731-0