TWI240830B - Projection display apparatus with two reflective light panels - Google Patents

Abstract

A projection display apparatus includes a light source configured to supply light; a polarizing beam splitter for splitting light from the light source into two different polarization state lights; two reflective light panels of which each has a color filter embedded therein and respectively modulates the two polarization state lights so as to simultaneously produce red, green and blue image lights; and a projection lens receiving these color image lights and then projecting them onto a viewing surface so as to form a full-color image.

Description

1240830 V. Description of the invention (1) [Technical field to which the invention belongs] A kind of reflective light plate fixture The present invention relates to a kind of projection display device 'more particularly to a projection display device having two reflective light plates, each of which has a color Filters and light plates are embedded in them. [Previous technology] In a projection display system, it is used to modulate a light. The modulated light is cast into two types of reflective panels in a projection display system. In the system, the light provided by a liquid crystal display source is shadowed on a display screen and the liquid crystal display panel is a main panel which is used as a tuning device so that a projection lens can form an image. It is used in both the transmissive panel and the conventional reflective panel. The single-crystal silicon liquid crystal (LCoS) panel has recently attracted much attention, due to the LCoS panel system. A reflective liquid crystal element is provided on a back panel of a stone slab, and has characteristics such as small size and high resolution. LCoS panels have many advantages over other bear-type reflective LCD panels. For example, crystalline silicon can be used to form an active array element of an LC panel. The Shi Xi backplane can also form thin-film transistor drivers (TFTs) and other functional circuits by conventional high-efficiency semiconductor process technology. Furthermore, a larger active area can be used to process the image information to be displayed. In a projection display system with LCOS, a single-panel and three-panel LCos projection multi-camera system has been used to achieve a full-color image. In order to achieve a full-color image with a white light source, a color management system is needed to temporally or spatially divide the spectrum into red, green, and basket colors. Temporal or timed color tubes

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In the Rakuten system, a single-LCoS panel generates a full color by using sequential colors (sequential CoOer). In spatial or multi-path color management systems, the two LC 0S panels are used to generate their corresponding primary colors. For a single-chip LC 0s system, although the whole is f Low, and the volume is small, but there is a problem. For a three-chip LCOS system, its optical structure can easily drive a higher lumen output to provide a large area projection display, But its structure is complicated. Therefore, a two-chip LC0s system was used to overcome the disadvantages of the above system. In addition, the two-chip Lcos system integrates the features of the f-chip and two-chip LCoS systems described above, which includes the advantages of high light output and the small size and low cost of the single-chip LC0S. Please refer to FIG. 1, which is a schematic diagram showing a conventional projection display device. The projection display device 00 includes a white light source 102 for supplying light 103; a first pure (c 1 ea η-up) polarizing plate 104; and a color switch. 106;-polarizating beam splitter (PBS) 108;-reflective panel 110 and a projection lens 112. The color switch 106 is an electronic switchable spectral filter for sequentially generating a red, a green, and a blue light 1 1 4. The polarized light splitting element 108 receives the monochromatic light 1 1 4 and then reflects it to the reflective panel 1 1 0. The reflective panel 1 1 0 modifies the monochromatic light 1 1 4 to change the polarity of the monochromatic light 1 1 4 and reflects the modulated monochromatic light 1 1 4 so that it passes through the monochromatic light 1 1 4. Polarized light splitting element 108. The projection lens 112 is received by the polarized light splitting element 108 after the modulation.

00780.ptd Page 7 1240830 V. Description of Invention (3) The monochromatic light 114 is projected. However, the above-mentioned projection display shows through, green, and blue images in order to open; the system must project red continuously, and the design is complicated, and the color ^: full fir image. Therefore, the circuit synchronization is difficult. In addition, the use of f: 乂 06 and the reflective panel 110 makes the projection display 〆 ¥ -shaped switch 106 and its related circuits. In view of this, the overall cost of the present invention and ㈣ ㈣ is relatively increased. It has a simple control circuit and a low-cost video display device. [Summary of the Invention] Cost of clothing. The purpose of the present invention is to provide a simple control circuit and a lower display device. Approved pieces (polarizing beam to provide light; the polarizing beam splitting / smoothing lens' where the light source is polarized light in different states; per-reverse: 5 pieces are used to divide the light into two, and are adjusted separately The system has a colored iris film that penetrates red, green, and blue image light: polarized light in the same state. "Synchronous generation and the projection lens system receive these shadows. The screen is viewed to form a full-color image.-One feature of the present invention is that the two reflective light plates used in the projection display device each have a single color and a two-color filter, and the light sheet is embedded therein for Red, green and blue image light are generated simultaneously to achieve a full-color image.

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Another feature of the present invention is that the projection display uses fewer electronic components and optical components to achieve: The overall cost can be reduced. In order to make the above and other objects, features, and advantages of the present invention more apparent, the following description will be described in detail with reference to the accompanying drawings. [Embodiment] Please refer to FIG. 2, which is a schematic diagram showing a projection display device 2000 having two reflective light plates according to an embodiment of the present invention. The projection display device 2 0 0 includes a polarizing beam splitting element (p0larizing beam, sp 1 i 11 e, 2 0 2), which is used to reflect s-polarized light to a horizontal direction, and allows P Polarized light passes directly through itself. The polarized light beam splitting element 200 has a light input surface 202a and a first light splitting surface 202b, which are vertically adjacent to the light input surface 202a and a second light splitting surface 202c. The light splitting surface 202b and a light output surface 202b are opposite to the first light splitting surface 202b. A light source 20 3 is used to provide a white light 203a, which is directed toward the polarizing beam splitter element 202. A P-state polarizing plate 204 is disposed in the vicinity of the light input surface 202a to allow p-polarized light to pass directly through it and absorb S-polarized light. A first green / magenta color separator (c0 0Γ selector) 2 0 6 is disposed between the p-state polarizer 20 04 and the light input surface 2 0 2 a to convert the magenta light passing through itself. State of polarization. A first reflective light plate 208 is disposed near the first light splitting surface 202b, and a second reflective light plate 210 is set near the second light splitting surface 202c. A second green / magenta color selector 212 is disposed near the light output surface 202d. One S-state polarizer 2 14 series

00780.ptd Page 9 1240830 V. Description of the invention (5) It is placed near the second green / magenta color separator 212 and 202 d relative to the light output surface, and the S-state polarizer 21 4 is used To prevent p-polarized light from passing through itself. A projection lens 2 1 6 is used to receive light passing through the S-state polarizing plate 214. When the first and second reflecting light plates 208 and 210 are in a display state, they will modulate and convert the polarization state of the light incident on them, and will reflect the modulated light to An opposite direction. In the following, the operation of the projection display device 2000 of the present invention will be described in more detail with the first and second reflecting light plates 2 08 and 2 10 in the display state. In addition, two quarter wave plates 2 1 8 and 2 2 0 are respectively disposed between the polarized light splitting element 2 0 2 and the first and second reflective light plates 2 0 8 and 2 1 0 for strengthening. The contrast quality of the image. According to the projection display device of the present invention, the first and second reflective light plates 2 08 and 2 10 are preferably LCoS panels, each of which has a color filter embedded therein. Fig. 3 is a sectional view showing one of the LCoS panels 50 according to the present invention. The LCoS panel 50 includes a glass substrate 52, a silicon back plate 54, and a liquid crystal layer 56 disposed therebetween. The silicon backplane 54 is provided with a plurality of trimming electrodes 58, and the glass substrate 52 is provided with a color filter 60 and a transparent electrode layer (ITO layer) 62. The color filter 60 is disposed on the glass substrate 52. Between the glass substrate 52 and the transparent electrode layer 62. The color filter 60 includes a plurality of color sub-pixels 60 a for filtering colored light passing through itself. In this embodiment, the color filter embedded on the first reflective light plate 2008 is a red / blue filter, which includes red and blue sub-pixels, and is embedded in the second reflection The color filter on the light plate 21 is a green filter, which includes only green sub-pixels.

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The first and second green / magenta color separators 206 and 2 1 2 can be ColorSelect's ColorSelect filter products, and can be obtained through commercial means. 'The ColorSelect filter products are used to convert a predetermined The polarization of colored light. In this preferred embodiment, the first green / magenta color filter is used to convert p-polarized magenta light passing through it into S-polarized magenta light and allow green light to pass through it. itself. The second green / magenta color separator 2 1 2 is used to convert p-polarized blue light and red light (magenta light) passing through itself into S-polarized light, and allow green light to pass through itself. When white light 230a is supplied to the P-state polarizing plate 204, only p-polarized white light passes through the P-state polarizing plate 204 and reaches the first green / magenta color separator 206. The first green / magenta color separator 2 06 separates the P-polarized white light into S-polarized magenta light 2 2 2 and P-polarized green light 2 2 4. When the polarized light splitting element 2 0 2 receives the S-polarized magenta light 2 2 2 and the P-polarized green light 2 2 4 by the first green / magenta color separator 2 06, the polarized light splits The element 20 2 reflects the S-polarized magenta light 222 to the first reflective light plate 208 and allows the P-polarized green light 224 to pass directly through itself. Thereafter, the S-polarized magenta light 222 and the P-polarized green light 2 24 reach the first reflective light plate 208 and the second reflective light plate 2 1 0, respectively. When the first and second reflective light plates 2 0 8 and 2 1 0 are in a display state, the S-polarized magenta light 2 2 2 is modulated through the first reflective light plate 2 0 8 and their polarization states The system will be changed to a P-polarized state. Then, the P-polarized magenta light 222 is reflected by the first reflective light plate 208 and passes through a red / blue filter embedded on the first reflective light plate 208 to generate a P pole. Turn red

00780.ptd Page 11 1240830 V. Description of the invention (7) Image light 22 6 and P-polarized blue image light 22 8. The P-polarized red image light 2 2 6 and the P-polarized blue image light 2 2 8 directly pass through the polarized light splitting element 2 0 2 and reach the second green / magenta color separator 2 1 2. The second green / magenta color separator 21 2 converts the polarization state of the P-polarized red image light 2 26 and the P-polarized blue image light 2 2 8 into an S-polarized state; thereafter, the S-pole The red image light 2 2 6 and the S-polarized blue image light 2 28 pass through the S-state polarizer 2 1 4 and reach the projection lens 2 1 6 to be projected on the projection lens 2 1 6 On a projection screen (not shown). On the other hand, the P-polarized green light 224 is modulated by the second reflecting light plate 210, and its polarization state is changed to an S-polarized state. Next, the S-polarized green light 2 24 is reflected by the second reflective light plate 210 and passes through a green filter embedded on the second reflective light plate 210 to generate S-polarized green image light 2 3 0. After that, the S-polarized green image light 230 is transmitted to the polarizing beam splitter element 202, and is reflected by the polarizing beam splitter element 202, so as to sequentially pass through the second green / magenta color separator. 2 1 2. The S-state polarizing plate 2 1 4 finally reaches the projection lens 2 1 6. After the green image light 230 is projected through the projection lens 216, it is combined with the red image light 22 6 and the blue image light 228 to form a full-color image on the projection screen (not shown). Reference is now made to Fig. 4, which is a schematic diagram showing a projection display device 400 having two reflective light plates according to another embodiment of the present invention. The projection display device 400 differs from the projection display device 200 (as shown in FIG. 2) in that it does not need to use the P-state polarizing plate 204 and the first green in the projection display device 200 / Magenta color separator 2 0 6 to achieve a full color

00780.ptd Page 12 1240830 V. Description of the invention (8) Purpose of image. The projection display device 400 includes a polarizing beam splitting element 402, a light source 403, a first reflective light plate 408, a first reflective light plate 410, and a green / magenta color separator 4 1 2. An S State polarizing plate 4 1 4, a projection lens 416, a first quarter wave plate 418 and a second quarter wave plate 420. Similarly, the first and second reflecting light plates 408, 410 Preferably, it is an LCoS panel, each of which has a color filter in it; wherein the color filter behind the first reflective light plate 408 is a red / blue filter and is embedded. The color filter on the second reflecting light plate 4 1 0 is a green filter. The light source 403 is used to provide unpolarized white light 40 3a, wherein the white light 40 3a includes at least S-polarized white light 422 and P-polarized white light 4 24. When the white light 403a is provided to the polarized light splitting element 402, the polarized light splitting element 402 will reflect the S-polarized white light 422 to the first reflective light plate 408, and allow the P-polarization The white light 424 passes directly through itself. Thereafter, the S-polarized white light 422 and the P-polarized white light 4 24 reach the first reflective light plate 408 and the second reflective light plate 4 1 0, respectively. When the first and second reflecting light plates 4 0 8 and 4 1 0 are in a display state, the S-polarized white light 4 22 is modulated by the first reflecting light plate 408, and its polarization state is changed. Into a P-polarized state. Next, the p-polarized white light 4 2 2 is reflected by the first reflective light plate 4 08 and passes through a red / blue filter embedded on the first reflective light plate 4 0 8 to generate The p-polarized red image light 426 and the p-polarized blue image light 428. The P-polarized red image light 4 26

00780.ptd Page 13 1240830 V. Description of the invention (9) and the P-polarized blue image light 4 2 8 directly pass through the polarized light splitting element 4 0 2 and reach the second green / magenta color separator 4 1 2. The second green / magenta color separator 41 2 converts the polarization state of the P-polarized red image light 426 and the P-polarized blue image light 4 28 into an S-polarized state; thereafter, the s-polarized red The image light 42 6 and the S-polarized blue image light 428 pass through the S-state polarizing plate 4 1 4 and reach the projection lens 4 1 6 to project a projection screen through the projection lens 4 1 6 ( (Not shown). On the other hand, the p-polarized white light 424 is modulated by the second reflecting light plate 41 0, and its polarization state is changed to an S-polarized state. Next, the s-polarized white light 4 2 4 is reflected by the second reflective light plate 41 0 and passes through a green filter embedded on the second reflective light plate 41 0 to generate an s-polarized green image. Light 430. After that, the S-polarized green image light 430 is transmitted to the polarizing beam splitting element 4 0 2 ′ and is reflected through the polarizing beam splitting element 4 02 to sequentially pass through the second green / magenta color separation. 412, the s-state polarizing plate 4 1 4, and finally reaches the projection lens 4 6. After the green image light 430 is projected through the projection lens 416, it is combined with the red image light 426 and the blue image light 428 to form a full-color image on the projection screen (not shown). According to the projection display device 400 according to the present invention, the white light 403a provided to the polarized light splitting = 402 may be unpolarized, so that the optical element system for polar white light 4.03a is used. It can be omitted, thus reducing the overall cost of the investment in the display device 400. In addition, when the red / blue filter is 蚪:,: the working color sub-pixels, and the size of each monitor color sub-pixel is set at a fixed ratio. Hai light source 4 0 3 series can be provided according to the proportion design-mixed with blue 1240830

5. Description of the invention (10) White light with red light or red light. For example, if the light source 403 provides a white light mixed with κ color light, the size design of each blue sub-pixel can be smaller than the size of a red sub-pixel to produce a balanced blue image light and red With like light. It should be understood that 'the red / yellow color filter and the green are lost in the reflecting light plates 4 0 and 4 10 respectively; the light filter can also be composed of a blue / green filter and a red filter, The light sheet is replaced by a green / red filter, a light filter, and a blue filter, so that red, blue, and green image light can be synchronously generated by the reflective light plates 408, 410, and by the The projection lens 416 projects to produce a full-color image. Although the foregoing description and drawings have disclosed preferred embodiments of the present invention, it must be understood that various additions, many modifications and substitutions may be used in the preferred embodiments of the present invention without departing from the scope defined by the appended patents. The spirit and scope of the principles of the present invention. Those skilled in the art will appreciate that the present invention may be used in many forms, structures, arrangements, proportions, components and assemblies. Therefore, the embodiments disclosed herein should, in all respects, be considered to illustrate the present invention, rather than to limit the present invention. The scope of the invention should be defined by the appended patent application 'and encompass its legal equivalents, and is not limited to the foregoing description.

1240830 Schematic description [Schematic description] Figure 1 is a schematic view of a conventional projection display device with two LCoS panels. FIG. 2 is a schematic diagram of a projection display device having two reflective light plates according to an embodiment of the present invention. Fig. 3 is a sectional view of an LCoS panel with a color filter embedded therein according to the present invention. FIG. 4 is a schematic diagram of a projection display device having two reflective light plates according to another embodiment of the present invention. Description of drawing number: 50 LCoS panel 52 glass substrate 54 silicon back plate 56 liquid crystal layer 58 electrode 60 color filter, light sheet 6 0a color sub-pixel 62 transparent electrode layer 100 projection display device 102 white light source 103 light 104 polarizing plate 106 color switch 108 Polarizing beam splitting element 110 Reflective panel 112 Projection lens 200 Projection display device 202 Polarizing beam splitting element 2 0 2a Light fm entrance surface 202 b First beam splitting surface 2 0 2c Second beam splitting surface 2 0 2 d Light output surface 203 Light source 2 0 3 a white light

00780.ptd Page 16 1240830 Schematic description 204 P-state polarizer 2 0 6 First green / magenta color separator 20 8 First reflective light plate 210 Second reflective light plate 212 Second green / magenta color separator

214 S-state polarizer 216 Projection lens 218 Quarter wave plate 220 Quarter wave plate 222 Magenta light 224 Green light 226 Red image light 228 Blue image light 230 Green image light 400 Projection display device 402 Polarized light splitting Element 403 Light source 40 3 a White light 408 First reflective light plate 410 Second reflective light plate 412 Green / magenta color separator 414 S-state polarizer 416 Projection lens 418 First quarter wavelength plate 420 Second quarter wavelength Plate 422 S polarized white light 424 P polarized white light 426 Red image light 428 Blue image light 430 Green image light

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Claims (1)

1240830 VI. Application for Patent Scope 1. A projection display device comprising: a light source for providing a first polarized light and a second polarized light; a polarized light splitting element for polarizing the first polarization The light and the second polarized light are separated in two directions; a first reflective light plate having a first color filter and a light sheet buried therein; the first reflective light plate receives the first polarized light by the polarized light splitting element And reflects a first image light; a second reflective light plate that receives the second polarized light by the polarized light splitting element and reflects a second image light; a first color separator for An image light is converted into the same polarity as the second image light; and a projection lens is used by the first color separator to receive and project the combined first and second image light. 2. The projection display device according to item 1 of the application, wherein the directions of the first and second polarized light are orthogonal. 3. The projection display device according to item 1 of the patent application scope further includes a first polarizing plate which is disposed between the first color separator and the projection lens. 4. The projection display device according to item 1 of the scope of patent application, further comprising: a first quarter-wavelength plate disposed between the polarizing beam splitting element and the first reflective light plate; and a second quarter-wavelength plate A wavelength plate is disposed between the polarizing beam splitting element and 00780.ptd Page 18 1240830 Sixth, the scope of patent application The second reflecting light panel. 5. The projection display device according to item 1 of the scope of the patent application, wherein the first and second reflecting light plates are L CO panel. 6. The projection display device according to item 1 of the scope of patent application, wherein the first color filter is a monochrome filter. 7. The projection display device according to item 1 of the scope of patent application, wherein the first color filter is a two-color filter. 8. The projection display device according to item 6 of the scope of patent application, wherein the monochrome filter is selected from the group consisting of red, green and blue. 9. The projection display device according to item 7 of the scope of patent application, wherein the two-color filter is selected from the group consisting of red, green and blue. 10. The projection display device according to item 1 of the scope of patent application, wherein the second reflecting light plate has a second color filter embedded therein. 11. A projection display device comprising: a light source for providing a first polarized light and a second polarized light; a polarized light splitting element for connecting the first polarized light and the second polarized light Chemiluminescence is separated in two directions; 00780.ptd Page 19 1240830 Sixth, the scope of patent application-a first reflective light plate with a first color filter embedded therein, the first reflective light plate receives the first polarized light by the polarized light splitting element, and Reflect a first image light; a second reflective light plate, which receives the second polarized light by the polarized light splitting element, and reflects a second image light; a first quarter wave plate, which is disposed on the A polarizing beam splitting element and the first reflecting light plate; a second quarter-wave plate disposed between the polarizing beam splitting element and the second reflecting light plate, and a projection lens for receiving and projecting the combined light First and second image light. 1 2. The projection display device according to item 11 of the patent application, wherein the directions of the first and second polarized light are orthogonal. 13 3. The projection display device according to item 11 of the scope of patent application, further comprising a first polarizing plate, which is disposed between the polarized light splitting element and the projection lens. 14. The projection display device according to item 11 of the scope of patent application, wherein the first and second reflecting light plates are LCoS panels. 15. The projection display device according to item 11 of the scope of patent application, wherein the first color filter is a monochrome filter. 00780.ptd Page 20 1240830 VI. Scope of patent application 16. The projection display device according to item 11 of the scope of patent application, wherein the first color; the light filter is a two-color filter. 17. The projection display device according to item 15 of the scope of patent application, wherein the monochrome filter is selected from the group consisting of red, green and blue. 18. The projection display device according to item 16 of the scope of patent application, wherein the two-color filter is selected from the group consisting of red, green and blue. 19. The projection display device according to item 11 of the scope of patent application, wherein the second reflecting light plate has a second color filter embedded therein. 00780.ptd Page 21