TW556040B - Reflective type liquid crystal projection system - Google Patents

Abstract

The present invention provides a reflective type liquid crystal projection system which comprises a polarized light source; an image modulation device; a light-splitting/combining device; and a projection lens, wherein the polarized light source is S-polarized light or P-polarized light fully, and the polarized light is inputted into the light-splitting/combining device for splitting the light, so as to separate the three primaries (red, green, blue) which are then converted into the one with the other polarity by the image modulation processing provided by the reflective type liquid crystal panel of the image modulation device for being inputted into the light-splitting/combining device for combining the light, thereby assembling them into an output beam. Finally, the output beam is projected onto the screen by the projection lens to achieve the purpose of image formation. Thus, the reflective type liquid crystal projection system has the advantages of simple structure, small volume and low cost.

Description

556040

[Field of the Invention] The present invention relates to a reflective liquid crystal projection system, and more particularly to a reflective liquid crystal projection system that can simultaneously perform beam splitting and light combining processing to simplify the overall design. [Background of the Invention] The first figure is shown in Figure 1. It is a schematic diagram of a conventional liquid crystal projection system, including a light source 1a, a polarizing element 2a, a beam splitter 3a, and an image modulation. Device 4a, a combining device 5a, and a projection lens 6a ', wherein the light source 1 is projected on a polarizing element 2a, and is used to polarize the light source 1a into a single polarized light source (which Can be P-polarized light or S-polarized light); the spectroscopic device 3 a is used to divide the polarized light source into three primary color (red, blue, green) beams; the image modulation device 4 a is used to image the three primary color beams Modulated and converted to another polarity; the light combining device 5 a is used to combine the image modulated light output by the image modulating device 4 a; the projection lens 6 a is used to project the light combining device 5 a The combined output beam. In the spectroscopic device 3a, a first dichroic mirror 3 1 a, a first dichroic mirror 32 a, a first reflecting mirror 33 a, a second reflecting mirror 3 4 a, and a third reflecting mirror 3 5 a As a result, the first dichroic mirror 3 1 a splits a single polarized light source output by the polarizing element 2 a so that the blue light B therein penetrates, and the red and green light are reflected! The first reflection The mirror 3 3 a is used to receive the blue light B output by the first dichroic mirror 3 1 a and reflect the blue light β; the second dichroic mirror 3 2 a is used to receive the first

556040 V. Description of the invention (2) The red and green light output by the dichroic mirror 3 1 a! ^, And the red light r is reflected, and the green light G is transmitted; the second mirror 3 4 a is used to receive The green light G output from the second dichroic mirror 3 2 a reflects the green light g; the third mirror 3 5 a is used to receive the green light G output from the second mirror 3 4 a, The green light G is reflected. In the image modulation device 4 a, a first liquid crystal panel 4 1 a, a second liquid crystal panel 4 2 a, and a third liquid crystal panel 4 3 a are used. The first liquid crystal panel 4 1 a is used for To receive the blue light B ′ output from the first reflector 3 3 a and modulate the blue light B into a modulated light B * with an image signal; the second liquid crystal panel 4 2 a is used to receive the second The red light R output by the dichroic mirror 3 2 a is modulated into a modulated light R * with an image signal; the third liquid crystal panel 4 3 a is used to receive the third mirror 3 5 The green light G output a is tuned to the green light g to a modulated light G * with an image signal. In the part 5a of the light combining device, it is a cross dichroic mirror 5 1a, which is composed of a third dichroic mirror 511a, a fourth dichroic mirror 512a, a fifth dichroic mirror 5 1 3a, and A sixth dichroic mirror 5 1 4 a, wherein the third dichroic mirror 5 1 1 a and the fifth dichroic mirror 5 1 3 a are arranged diagonally, and the fourth dichroic mirror 5 1 2 a It is arranged in another diagonal line with the sixth dichroic mirror 5 1 4 a. The third dichroic mirror 5 1 1 a transmits blue and red light B * R * and reflects green light G *. The fourth dichroic mirror 5 1 2 a reflects blue light and red light R * penetrates; the fifth dichroic mirror 5 1 3 a penetrates red light R * and reflects green light G *; and The sixth dichroic mirror 5 1 4 a reflects the blue light, and the red and green light pass through.

556040 V. Description of the invention (3) Therefore, the light combining device 5 a can combine the modulated light output by the first, second, and third liquid crystal panels 4 1 a, 4 2 a, and 4 3 a into an output beam. R * G * B *. Finally, the projection lens 6 a projects the output beam onto a glory screen (not shown). However, in the conventional liquid crystal projection system described above, the processing of splitting and combining light is 'respectively performed by different devices, which will increase the number of optical components' and will increase the size and cost of the entire system architecture. Moreover, when the above-mentioned green light G is spectrally processed, the required optical paths are longer than those of the red and monitor color light RB, which makes the optical paths of the three different in length, and also causes the final input in the When the third liquid crystal panel 4 3 a has insufficient brightness and uniformity, the second dichroic mirror 3 2 $, the first reflecting mirror 3 4 a, the second reflecting mirror 3 4 a, and the third reflecting mirror may be insufficient. A condenser lens (figure omitted) is added between 3 and 5 a to make up for the lack of brightness and uniformity of the green light g, but this method will cause the overall cost to increase and the design complexity. Therefore, it can be seen from the above that the above-mentioned conventional liquid crystal projection system obviously has inconveniences and defects in practical use, and needs to be improved. ^ The reason is that the present inventor felt that the above-mentioned deficiency could be improved. He devoted himself to the research and cooperated with the application of theories to finally propose a present invention with a reasonable design and effective above-mentioned deficiency. " [Objective of the invention] The main object of the present invention is to provide a reflective liquid crystal projection system, which mainly uses the same device to split and combine light to simplify the whole process.

Page 6 556040 V. Description of the invention (4) System design 'Effectively reduce the number of optical components, reduce the overall volume and reduce costs. [Features of the Invention] ^ In order to achieve the above object, the present invention provides a reflective liquid crystal projection system including a polarized light source, an image modulation device, a splitting device, and a projection lens, wherein the image modulation device is composed of A first liquid crystal panel is composed of a second liquid crystal panel and a third liquid crystal panel, which are respectively used to modulate the image of the light ==, the light is converted to another polarity and reflected and output; the first: Ling set is used for The polarized light source is separated into a first primary color light, a single color light, and a third primary color light, and the first, second, and third primary colors f are output to the image modulation device for image modulation processing. It becomes a first by dimming light, a second primary color dimming, and a third primary color dimming, and then the combining device combines the first, second, and third primary color dimming. An output beam; and a projection lens for projecting the wheel-out beam [Detailed Description of the Invention] Significant techniques, but limited to intraoperative techniques: Li Gui review members can further understand the present invention ^ Please refer to the following detailed description of the present invention and the drawings. The drawings are provided for reference and explanation only, and are not intended to be used for the present invention.

Illustration. = Refer to the second figure, which is the first embodiment of the present invention. The present invention is a reflective liquid crystal projection system, including a

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Conversion unit 2 is used to apply unpolarized aurora to provide the input light as a reflection and guide the input light to provide a split and combined light for image modulation of the input light, different colors of light in the line, a Projection mirror among them: 5. Description of the invention (5) for emitting a white light source, a polarized polarization treatment, a reflecting mirror 3, a guide, a coupling device 4 for processing, an image modulation device 5, A beam splitter 6 is used to separate the optical head 7 to project the output beam; / The white light source 'only emitted by light source 1' is subjected to the polarization element 2 :: chemical treatment, and in this embodiment, the polarization element The light output by 2 is a polarized light source Ws that is earlier than one S-polarized light; the reflector 3 is used to reflect and input the polarized light source Ws output by the polarizing element 2 into the coupling device 4, where the polar The light output by the chemistry element 2 can also be changed to a single p-polarized polarized light source as required. • The decoupling device 4 is a cross dichroic prism 41 ′, which is composed of four triangular prisms 4i 1, 412, 4 1 3, and 414, respectively in the triangle 稜鏡4 workers 2 j 4 1 3, 4 1 4 The adjacent interface between each other is plated with a designed mineral film surface for light splitting and light combining processing, which includes a second color mirror 41 5 that intersects each other. And a second dichroic mirror 416, please refer to the third figure and the third figure, which are shown as a graph of the transmittance and wavelength of the first dichroic mirror and the second dichroic mirror, respectively. The first dichroic mirror 4 丄 5 is used to transmit S-polarized blue and green BsGs light and red light. Reflection, and blue and green light BpGp reflection of p-polarized light, red light is transmitted; and the second dichroic mirror 4 1 6 is used to reflect blue and green light BsGs of s-polarized light, and red light Rs is transmitted. , And blue and green BpGp light penetration of p-polarized light, red

556040 V. Description of the invention (6) Rp reflection of colored light. The image modulation device 5 is composed of a first liquid crystal panel 5 1, a second liquid crystal panel 5 2, and a third liquid crystal panel 53. The reflected output is obtained. In addition, the beam splitter 6 is disposed between the splitting device 4, the second liquid crystal panel 52, and the third liquid crystal panel 53. Accordingly, when the polarized light source Ws of the S-polarized light is input to the splitting and combining device 4 in this embodiment, it is divided into two stages: component light and combining light. In the splitting phase, the input polarized light source is processed. Ws separates the first primary color light (red light) Rs, the second primary color light (blue light) Bs, and the third primary color light (green light) Gs. In the portion processed by the first primary color light rs, the first dichroic mirror 4 1 The 5 series reflects the primary color light Rs and outputs it, and the second dichroic mirror 4 1 6 makes the first primary color light Rs penetrate itself, that is, the splitting device 4 causes the first primary color light Rs to reach the first The liquid crystal panel 5 1; In addition, in the portion processed by the second primary color light Bs and the third primary color light Gs, the second dichroic mirror 4 1 6 reflects and outputs the second primary color light Bs and the third primary color light Gs, and the first color separation The mirror 4 1 5 will allow the second primary color light Bs and the third primary color light Gs to penetrate itself, that is, the splitting device 4 will cause the second primary color light Bs and the third primary color light Gs to be output to the beam splitter 6, and the beam splitter 6 6, the second primary color light Bs is reflected and the third primary color light Gs is transmitted, that is, the second primary color light Bs is output to the second liquid crystal panel 5 2 and The third primary color light Gs is output to the third liquid crystal panel 5 3. When the first, second, and third liquid crystal panels 5 1, 5 2, and 53 receive the first, second, and third primary color lights Rs, Bs, and Gs, respectively, the first, second, and third liquid crystal panels 5 will be the first First, the first and second primary color light Rs, Bs and Gs

Page 9 556040 V. Description of the invention (the image is converted into P-polarized light, and the first, second and third liquid crystal panels 5 1, 5 2 and 5 3 respectively reflect and output the first modulated primary color light ( Red light) Rp, second modulated primary color light (blue light) BP, and third modulated primary color light (green light) Gp. In the light combining phase, the first, second, and third liquid crystal panels 5 1, 5 The first modulated primary color light, the second modulated primary color light, and the third modulated primary color light rp, Bp, and Gp reflected by 2 and 5 3 are combined, and in the portion processed by the first modulated primary color light Rp, the second The dichroic mirror 4 1 6 reflects and outputs the first modulated primary color light Rp, and the first dichroic mirror 4 1 5 makes the first modulated primary color light Rp penetrate itself, that is, the splitting device 4 causes First modulation primary color light

Rp is output to the projection lens 7; in the second and third modulated primary color light and Gp processed parts, the beam splitter 6 will reflect the second modulated primary color light Bp and penetrate the third modulated primary color light Gp, that is, the first The second and third modulation primary color light "and leaves will be input to the switching device 4, and the first dichroic mirror 4 1 5 reflects the second and third modulation, rhombic primary light Bp and Gp, and the second The color mirror 4 1 6 will allow the second and third modulated primary colors Bp and Gp to penetrate through itself, that is, the switching device 4 will cause the second and third modulated primary colors Bp and Gp to be output to the projection lens ^ ; The light beam projected by the projection lens 7 is the output beam RpGpBp, and the projected beam RpGpBp is projected to a screen (not shown) to achieve the purpose of image formation. Furthermore, the general polarizing element 2 The output light cannot all be a single s or p-polarized light, that is, in this embodiment, the polarized light source Ws with a single s-polarized light output by the polarizing element 2 will be directly output with a little ρ polarization, Causes light unevenness or light leakage

Page 10 556040 Description of the invention (8) A polarizer (PolariZer) 3 1 is installed between the reflector 3 and the ^-sister-please refer to the fifth figure, which is the second embodiment of the present invention.踹 You 丨, intention. With the polarizing plate 31, excess p-polarized light can be filtered. In the example where all the light entering the coupling device 4 is three-polarized light; the same applies to the second and third liquid crystal panels 51 and 52 in this implementation. And 53 reflection two: force, in addition to mainly ρ polarized light will also entrain a little 5 polarized light, shadow lens ^ "^ ^ ^ between the split device" j 7 ", the polarizer 3 2 can be fine The excess 3 polarizations are filtered out so that all the light entering the projection lens 7 is S-polarized light. 4 Refer to the sixth figure, which is a frame diagram of the third embodiment of the present invention. The reflector 3 in the first embodiment is changed to a polarized light separation center, (Polarzlng beam spliUer; pBS) 3 3. The beam splitter 6 is changed to a beam splitter 6 1, and in the first liquid crystal panel A transparent block 3 4 is added between the 5 丄 and the splitting device 4. The polarized light separation 稜鏡 3 3 uses the light output by the polarizing element 2 as a polarization beam splitting, so that excess p-polarized light can directly pass through. The dielectric layer 3 3 1, and the s-polarized light we want is reflected by the dielectric layer 3 3 1 and input to the coupling device 4 to achieve the effect of purifying the light. In addition, the beam splitter 6 1 and the transparent block 3 The part 4 can enable the splitting and combining device 4 to effectively shorten the optical path in the processing of splitting and combining light. Therefore, the reflection type liquid crystal projection system of the present invention has the following characteristics. The splitting and combining of the light through the splitting device can simplify the overall design, reduce the volume, and reduce the required cost. Is the output of the polarizing element all s-polarized or? Polarized light 556040, description of the invention (9) The patent law mentioned in the above description is to protect the doubt of the invention. "Please do not hesitate to take a detailed description and limit the scope of this hairpin. For any example, the artist covers this hairpin in the following This, to the extreme, this application, the rights and interests of the applicant, the above instructions, the drawings, but it is clear that this document and this document should contain the patented treatment of the case of the field, and please check thoroughly and ask for details. If Jun 0 is only the application of the invention of the present invention is exclusively within the present invention, the scope can be light. More pure. It meets the requirements of a patent application, so it ’s a good idea to convert to a patent right away. It ’s a good idea that the bureau ’s review committee has any of the best features of the specific embodiment. It is not limited to this. In the spirit of Fan Li's scope of patent application and the scope of similar changes, any changes or modifications familiar with the technology can be included. 556040 The diagram is a simple illustration. The first diagram is a schematic diagram of the structure of a conventional liquid crystal projection system. The second figure is a schematic diagram of the architecture of the first embodiment of the present invention. The third figure is a graph of the transmittance and wavelength of the first dichroic mirror in the first embodiment of the present invention. The fourth graph is a graph of transmittance and wavelength of the second dichroic mirror in the first embodiment of the present invention. The fifth diagram is a schematic diagram of the architecture of the second embodiment of the present invention. The sixth diagram is a schematic diagram of the architecture of the third embodiment of the present invention. [Illustration of drawing number]: [Knowledge]: 1 a light source 2 a polarizing element 3 a beam splitter 3 1 a first dichroic mirror 3 2 a second dichroic mirror 3 3 a first reflection mirror 34 a second reflection Mirror 3 5 a Third reflector 4 a Image modulation device 4 1 a First liquid crystal panel 4 2 a Second liquid crystal panel 4 3 a Third liquid crystal panel 5 a Light combining device

Page 13 556040 Brief description of the diagram 5 1 a cross dichroic 稜鏡 5 1 1 a third dichroic mirror 512a fourth dichroic mirror 513a fifth dichroic mirror 514a sixth dichroic mirror 6 a projection lens Element mirror source photon polar reflection [12 3 plate light polarization 1 2 3 3 3 3 polarized light separation 稜鏡 3 3 1 dielectric value layer 3 4 transparent block 4 splitting device 41 cross dichroic prism 411 , 412, 413, 414 triangles 4 1 5 first dichroic mirror 4 1 6 second dichroic mirror 5 image modulation device 5 1 first liquid crystal panel 5 2 second liquid crystal panel

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Claims (1)

556040 6. Scope of patent application 1. A reflective liquid crystal projection system, including: a polarized light source; a polarized and one image modulation device, which is composed of a first liquid crystal panel and a third liquid crystal panel and uses light as an image Modulating and turning a switching device into another system for the primary color light panel and a second liquid for the input reflection wheel; primary color light, first, second, and third primary color light are converted and converted into A first original and a second second and one cast 2. If an application is made to the conversion center 3, if an application is made to the three primary color third primary color shadow lens, the patent range is obtained by polarized light. The scope of the patent is polarized light, and the polarized light source is separated and separated-the first and third primary color lights, and the first output to the image modulation device is used to change the color tone of the image, and then the separation A combined output is used to project variable light. Modified light is used to project the reflective source described in item 1 of the output as a white light source and a second primary-tone light-changing device for the first and outgoing beams. The liquid crystal projection system passes a reflective liquid crystal projection system described in item 1 of a polarizing element, and the source is a single S-pole light source or a single P-pole light source 4. The reflective liquid crystal projection system described in item 1 of the scope of patent application Wherein, the polarized light source is input to the switching device by reflection from a mirror. 5. The reflective liquid crystal projection system as described in item 4 of the scope of patent application, wherein a polarizing plate may be added between the reflecting mirror and the splitting device. 6. The reflective liquid crystal projection system described in item 1 of the scope of patent application, Page 16 556040 6. Scope of Patent Application Among which, the polarized light source is first subjected to polarized light separation for polarized light splitting, so that the polarized light source input to the coupling device is a single S light source or a single P polar light source. 2. The reflective liquid crystal projection system according to item 1 of the scope of the patent application, wherein the first liquid crystal panel is used for modulating the first primary color light into the first primary color dimming; the second liquid crystal panel is The third primary color light is used to convert the second primary color light into the second primary color light. The third liquid crystal panel is used to change the third primary color light into the third primary color light. 2. The reflective liquid crystal projection system as described in item 1 of the scope of patent application, wherein the first primary color light and the first primary color change light are red light respectively. 0 The reflective liquid crystal as described in item 1 of the scope of patent application. The projection system, wherein the second primary color light and the second primary color changing system are blue light, respectively. 'The reflective liquid crystal projection system as described in item 1 of the scope of patent application', wherein the third primary color light and the third primary color changing light system are green light, respectively. 1 1. The reflective liquid crystal projection system described in item 1 of the scope of patent application, wherein the splitting and combining device is a cross dichroic device, which includes a first dichroic mirror and a Second dichroic mirror. 1 2. The reflective liquid crystal projection system according to item 11 of the scope of the patent application, wherein the first dichroic mirror is used to reflect the first primary color light to the first liquid crystal panel and make the first primary color Variable light penetrates the first dichroic mirror to the second dichroic mirror, and makes the second and third primary color light penetrate the Page 17 556040 6. Scope of patent application The first dichroic mirror to the second dichroic mirror, and the second and third primary colors are output to the projection lens. 1 3. The reflective liquid crystal projection system according to item 11 of the scope of patent application, wherein the second dichroic mirror is used to sequentially reflect the second and third primary color lights to the second liquid crystal panel and the first Three liquid crystal panels, which change the light of the second and third primary colors to penetrate the second dichroic mirror to the first dichroic mirror, and make the first primary color light to penetrate the second dichroic mirror to the first dichroic mirror Mirror, and outputting the first primary color to the projection lens. 14. The reflective liquid crystal projection system as described in item 13 of the scope of patent application, wherein the second and third primary color light reflected and output by the second dichroic mirror first pass through a dichroic mirror 'and is passed through the dichroic mirror. The second primary color light is reflected to the second liquid crystal panel, and the third primary color light is transmitted to the third liquid crystal panel. 15. The reflective liquid crystal projection system according to item 14 of the scope of patent application, wherein the beam splitter can also be a beam splitter. 16. The reflective liquid crystal projection system according to item 1 of the scope of patent application, wherein a transparent block can be added between the first liquid crystal panel and the switching device. 17. The reflective liquid crystal projection system according to item 1 of the scope of patent application, wherein a polarizing plate can be added between the splitting device and the projection lens. Page 18