TWI356272B - Color management system - Google Patents

Description

1356272 100. Aug. 19, Amendment Replacement Page VI. Description of the Invention: [Technical Field of the Invention] [0001] The present invention relates to a color management system, and more particularly to a color management system for a projector. [Prior Art] [0002] A liquid crystal projector is widely used as a device for amplifying video and the like on a personal computer and a television. In the past, a projector using a transmissive spatial light modulator has been developed. In recent years, a reflective liquid crystal projector using a reflective spatial light modulator has been developed for the purpose of miniaturization and high definition. [0003] As shown in FIG. 1, it is a schematic diagram of an optical system of a prior reflective projector. The optical projector of the reflective projector includes a light source system 10, an image forming system 20, and an enlarged projection system 30. The light source system 10 includes a white light source 11, an ultraviolet (UV) / infrared (IR) color filter 12, and a collecting lens 13. The white light L from the white light source 11 filters out ultraviolet rays and infrared rays through the ultraviolet (UV)/infrared (IR) color filter 12, and then condenses the light by the collecting lens 13, and finally transfers it to the image forming system 20. The white light source 11 usually uses a high-intensity lamp such as a metal halide lamp or a high-pressure mercury lamp. The image forming system 20 includes first and second dichroic mirrors 21, 22, a total reflection mirror 23, and a polarization beam splitter (Polarization Beam)

Splitter, PBS) 24R, 24G, 24B, spatial light modulators 2 6R, 26G, 26B, half wave plate 25, and color synthesis prism 28. The first beam splitter 21 transmits only the red light R and the green light G, and reflects the blue light B. Therefore, the first beam splitter 21 splits the outgoing light from the polarizing beam splitter 14 into 096128602. Form No. A0101 Page 3 / Total 16 pages 1003304206-0

On the 19th, the remaining pages I had two kinds of light. The first type of light with red light R and green light G was transmitted through the first beam splitter 21 to the second dichroic mirror 22, while the blue light B was A spectroscope 21 is reflected onto the total reflection mirror 23, and is transmitted from the total reflection mirror 23 to the pseudo-vibration beam splitter 24B. The second beam splitter 22 reflects the green light G 仅 only through the red light r ′ and thus reaches the red light R and the green light G of the second beam splitter 22 through the first dichroic mirror 21 , and the green light G is separated by the second color The mirror 22 reflects 'and is transmitted to the polarization beam splitter 24G» and the red light R transmitted through the second dichroic mirror 22 is transmitted to the polarization beam splitter 24R. The light reaching the polarization beam splitters 24R, 24B, 24G is reflected to the respective spatial light modulators 26R, 26G, 26B, and processed by the spatial light modulators 26R, 26G^, 26B to form images of the respective colors, and The spatial light modulators 26R, 26G, 26B are reflected, again passed through the polarization beam splitters 24R, 24B, 24G, and the green light G is processed by the half-wave plate 25, and transmitted to the color synthesis 稜鏡 28 where color synthesis is performed. And then transferred to the enlarged projection system 30. The enlarged projection system 30 includes a projection lens 31 and a magnifying lens 32, where the image formed by the emitted light is enlarged, and the enlarged image is projected onto a g screen (not shown). [0007] The optomechanical design of the projection system described above, when the light is emitted from the conjugate, contains scattered light in the emitted light, and the presence of the disordered light is partly due to the optical characteristics inherent in all the real optical components. The resulting image noise, such as color synthesis, generally becomes a thermal load and physically distorts when subjected to high levels of luminous flux, causing stress birefringence, which causes depolarization and contrast reduction of light. There is also a reason that the red, green and blue light are respectively modulated in their respective spaces 096128602 Form No. 1010101 Page 4/16 pages 1003304206-0 1356272 Correction of the replacement pager on August 19, 100 In addition to the spatial information, it also receives the chaotic spatial information generated by the birefringence in the optical components such as the polarized beam splitter, such as the red, green, and blue light paths, and the messy light is not being projected. Effectively separate and remove noise from the display, these image noise and cluttered spatial information reduce the contrast of the projected light projected onto the screen. SUMMARY OF THE INVENTION [0008] In view of the above, it is necessary to provide a color management system capable of improving contrast.

[0009] A color management system comprising a combined aperture, a specific wavelength polarization conversion element disposed in a direction in which the light combining prism exits, and an analyzer disposed in a direction in which the polarization conversion element of the specific wavelength emits light. The light combining prism is used to combine incident light incident on the light combining prism to form a projection beam. The specific wavelength polarization conversion element is for converting a polarization state of light of a particular wavelength. The analyzer is used to pass light of a specific polarization direction. [0010] The color management system uses a specific wavelength polarization conversion element and an analyzer on the exit surface of the light combining prism, and the polarization direction of the emitted light is targeted. Sexually processing, and under the action of an analyzer, allows light of a specific polarization direction to pass and separate and exclude image noise caused by optical characteristics inherent to the real optical element, and by the red, green, and The chaotic spatial information generated by the birefringence in the optical component material of the blue light path enhances the contrast of the projected outgoing light. [Embodiment] The present invention will be further described in detail below with reference to the accompanying drawings. 096128602 Form No. A0101 Page 5 of 16 1003304206-0 1356272 [0012]

[0017] [0017] [0017] [0017] 096128602 100 August, 2011, please refer to FIG. 2, which is a schematic diagram of a color management system according to an embodiment of the present invention. The color management system is used for a three-piece reflective projector comprising a light source 31, an integrator 32, a polarization converter 33, first and second beam splitters 34a, 34b, three in sequence along the optical path. a metal grid type polarizer (WGP polarizer) 35R, 35G, 35B, three spatial light modulators 36R, 36G, 36B respectively disposed corresponding to the three WGP polarizers, The combined apertures 37 in the direction of the exit of the three WGP polarizers, a total reflection mirror 38 disposed between the first beam splitter 34a and the spatial light modulator 36B, and the direction of the outgoing light of the combined aperture 37 The specific wavelength polarization conversion element 39 and an analyzer 40 are disposed on the polarization conversion element 41 of the combining aperture 37 opposite to the other side of the analyzer 40, and a projection lens 42. Of course, it can be understood that the color management system of the present invention can also be used for two reflective projectors or transmissive projectors, as long as they have optical components such as eight-light prisms, polarization splitting n, and the above three reflective types. The instrument is only an example to illustrate the principle of the color management system. / It is necessary to further explain that the above various optical components are disposed along the optical propagation path 'here no' to indicate the physical position where they are located. The light source 31 emits white light including red (r), (G), and blue (B) required to display a color image. The light source 31 may be a halogen lamp, a metallization lamp or a gas lamp or the like. In this embodiment, the light source 31 is an integral of the halogen halogen, and the ground is self-converted and the ground polarized light converter 33 is used to convert the white light into the same-polarized form number. Delete page 6 / a total of 16 pages 1003304206-0 1356272 On August 19, 100, Jun Zheng replaced the light of the page state. In the present embodiment, the polarization converter 33 converts incident white light into P-polarized light, and outputs the P-polarized white light as outgoing light. [0018] The first beam splitter 34a has a function of separating light into red light B and other mixed colors of red light R and green light G. The second dichroic mirror 33b has a function of separating the red light R and the green light G. [0019] The principle of operation of the WGP polarizers 35R, 35G, 35B can be qualitatively explained by the free electron motion in the metal lines. If the polarization direction of the incident light is parallel to the metal line, the free electrons in the metal line are orientated along the metal line by the action of the external electric field. Since the metal line is long compared to the wavelength of the incident light, it corresponds to the incident light acting on the surface of the metal film, which means that the polarized light in the direction of the metal line will be reflected. On the contrary, when the polarization direction of the incident light is perpendicular to the metal line and the width of the metal line is smaller than the wavelength, the motion of the excited electron is severely limited, and it cannot effectively interact with the incident light wave, so that the second reflected wave and the refracted wave are not generated. In other words, the polarized light in this direction is transmitted. [0020] The spatial light modulators 36R, 36G, 368 may be liquid crystal on-silicone (LC) displays, and the process structure combines liquid crystal technology and semiconductor integrated circuit technology. The LC〇s panel uses a semiconductor process to fabricate the driver panel, and then grinds it on the transistor using a grinding technique, and uses a mineral or a silver mirror to form a CMOS substrate, and then a CMOS substrate and a glass substrate containing a transparent electrode. After lamination, it is filled into the liquid crystal and packaged for testing to form an LCoS panel. The LC〇s panel modulates the human light by controlling the polarization state of the light and adds a spatial information to the human light to form a corrected outgoing light comprising the person's light and the spatial information. 1003304206-0 096128602 Form No. A0101 Page 7 / Total 16 Page 13562272 [0022] [0024] 096128602 The light-receiving prism 37 has a mixed predetermined polarization component as described on the positive replacement page on August 19, 100 The colored light is used to emit the function of the mixed colored light. The combined aperture 37 has three incident faces and an exit face. The light combining prism 37 is an optical element having two planes that are perpendicular to each other. The first plane 371 is a dichroic filter 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 372, which is perpendicular to the first plane 371, also has a dichroic filter that transmits green light G and reflects red light R. Of course, it can be understood that the combined aperture 37 also has the function of separating the light of different polarization directions from the general polarization beam splitter. The total reflection mirror 38 is for totally emitting light from the incident direction and reflecting the incident light. The specific wavelength polarization conversion element 39 is a laminate composed of a plurality of layers of retardation films, which can convert, without loss, polarized light of a specific frequency band, that is, polarized light orthogonal thereto, the specific wavelength polarization conversion element. 39 can convert the polarization direction of incident light of any color of 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 39 is configured to convert the polarization direction of the incident green light G into a polarized light emitting green light G orthogonal thereto. The analyzer 40 may be a polarizer (Polarizer). ), which allows light of a certain polarization direction to pass, while absorbing light of other polarization directions. The polarization conversion element (Retaeder) 41 can obtain an organic film having optical anisotropy by a method such as stretching. It can be divided into one-half. Form No. A0101 Page 8 of 16 1003304206-0

[0025] 1356272 ^~~-- 100 years. On August 19th, the replacement page is replaced by a wave plate and a quarter wave plate. When the beam passes through the half-wave plate, the vibration direction of the beam can be rotated by 90 degrees only once, and for the quarter-wave plate, it 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 41 used is a half-wave plate, and it is formed by superposing two quarter-wave plates. The projection lens 42 is for enlarging an image corresponding to the emitted light, and projecting the enlarged image onto a screen (not shown). φ [〇027] The following is an explanation of the optical path traveled by the light beam in Fig. 2 and the action of the listed optical elements on the light beam. [0028] When the white light emitted from the light source 31 passes through the integrator 32, is converted into P-polarized light by the polarization converter 33, and then outputted, and the blue light B after being split by the first beam splitter 34& is split by the first beam splitter 34a. The reflection, and the green light g and the red light r pass through the first beam splitter 34a. Of course, it can be understood that the design of the beam splitter 34a can make any one of the red light R, the green light G and the blue light B. Light reflects 'and passes light from the other two components. The reflected blue light B passes through the WGP polarizer 35B under the action of the full® mirror 38 and reaches the spatial light modulator 36B 'the spatial light modulator 365 modulates the blue light B by controlling the polarization state of the light The blue light is modulated into s-polarized light and image signals are applied. Finally, the modulated blue light b of the S-polarized state is reflected to the WGP polarizing plate 35B'. The WGP polarizing plate 35B reflects the blue light B of the S-polarized state, thereby causing the blue light B to enter the combined grating 37. The blue light B of the S polarization state is reflected by the combining aperture 37 into the projection lens 42. [0029] The green light G and the red light R passing through the second dichroic mirror 34a are divided by the second dichroic mirror 341) 096128602 Form No. A0101 Page 9/16 pages 1003304206-0 1356272 [0030] [0031] 100 years and August On the 19th, the replacement page light 'green light G' is reflected by the second beam splitter 34b, and the red light R passes through the second beam splitter 34b. The green light G reflected by the second beam splitter 34b passes through the WGP polarizer 35G and reaches the spatial light modulator 36G. The spatial light modulator 36G modulates the green light G by controlling the polarization state of the light, that is, the green The light G is modulated into s-polarized light, and an image signal is applied. Finally, the modulated green light 6 of the s-polarized state is reflected to the WGP polarizing plate 35G, and the WGP polarizing plate 35G reflects the green light G of the S-polarized state to reach the polarization. The conversion element 41 converts the S-polarized light into p-polarized light and enters the combined aperture 37. The p-polarized green light G can pass directly through the combining aperture 37 to reach the projection lens 42. The red light R passing through the second dichroic mirror 34b passes through the WGp polarizing plate 35R and reaches the inter-work light modulator 36R' which is B-like with the blue light. The spatial light modulator 35R modulates the red light p into s-polarized light. The light beam 37 is reflected and enters the projection lens 42. [0032] The polarization states of the red light R, the green light G, and the blue light b emitted from the exit surface of the light-emitting aperture 37 are S polarization, P polarization, and S polarization, respectively. The red light R, the green light G, and the blue light B emitted from the light combining edge (4) pass through a specific wavelength polarization conversion element (10), convert the P-polarized green light G into the s-polarized green light G, thereby passing the analyzer. At 4Q, all the edited (4), paste, and blue B can pass the analyzer 40 » [0033] η-machi,·? When the κ micro-twist 40 is used, it receives 9 light-modulating surfaces, 36G'36B, and the outgoing light of the light-combining prism 37 - and corrects the exiting-step to generate polarized light oriented to a single plane (ie, linear Polarized light), and the resulting image noise light 096128602 Form No. A0101 Page 1 / 16 pages 1003304206-0 1356272 100 years. August 19th, according to the replacement page, to eliminate purpose. [0034] Light emitted from the analyzer 40 reaches the projection lens 42, through which the lens is enlarged and projected onto a camp (not shown).

[0035] The color management system uses a specific wavelength polarization conversion element and an analyzer on the exit surface of the light combining prism, and performs polarization processing on the polarization direction of the emitted light, and under the action of the analyzer, Allowing light of a particular polarization direction to pass through and excluding image noise caused by optical features inherent in the real optical component and birefringence in the optical component material in the red, green, and blue light paths Produces a messy spatial message that enhances the contrast of the projected exit light. [0036] In summary, the present invention complies with the requirements of the invention patent, and submits a patent application according to law. However, the above description 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 those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS [0037] FIG. 1 is a schematic diagram of an optical system of a conventional reflective projector. 2 is a schematic diagram of a color management system provided by the present invention. [Main component symbol description] [0039] Light source system: 1 0 [0040] Light source: 11, 3 1 [0041] Condenser lens: 13 [0042] UV/IR filter: 12 096128602 Form number A0101 Page 11 of 16 Page 1003304206-0 1356272 Correction replacement page on August 19, 100 [0043] Integrator: 32 [0044] Image forming system: 20 [0045] Polarizing light converter: 33 [0046] Half-wave plate: 25 [0047] Projection system: 30, [0048] Magnifier: 32 [0049] First and second beamsplitters: 21, 22, 34a, 34b

[0050] Polarized beam splitter: 24R, 24G, 24B

[0051] Metal Grid Type Polarizer: 35R, 35B, 35G

[0052] Specific wavelength polarization conversion element: 39

[0053] Spatial Light Modulator: 26R, 26G, 26B 36R, 36B, 36G

[0054] Light-emitting 稜鏡: 28, 37 [0055] First and second planes: 371, 372 [0056] Total reflection mirror: 23 ' 38 [0057] Analyzer: 40 [0058] Polarization conversion element: 41 [0059] Projection lens: 31, 42

096128602 Form No. A0101 Page 12 of 16 1003304206-0

Claims (1)

1356272 Correction and replacement page on August 19, 100. Patent application scope: 1. A color management system comprising a light source, two first beam splitters disposed on an exiting light path of the light source, a second beam splitter, and three a metal grid type polarizer 'three spatial light modulators respectively corresponding to the three metal grid type polarizers' - a polarization conversion element, a combined aperture, a specific wavelength polarization conversion element and a detection bias The light source is configured to generate white light, and the first beam splitter and the first beam splitter divide the white light emitted by the light source into red light, green light, and blue light, and the red light and the blue light respectively pass through a corresponding metal grid type. The polarizing plate and the corresponding spatial light modulator enter the combined light beam, and another metal grid type polarizing plate is disposed on the outgoing light path of the green light, and is located in the corresponding spatial light modulator and the polarization conversion element. The corresponding spatial modulator and the polarization conversion element are disposed along a direction of propagation of the green light; the polarization conversion element is located at a position before the green light enters the light combination, and The fixed wavelength polarization conversion elements are respectively disposed on opposite sides of the combined light beam; the green light passes through the corresponding metal grid type polarizing plate, is then modulated by a corresponding spatial light modulator, and then projected to the corresponding metal grid a grid-type polarizer of the corresponding metal grid-type polarizer that reflects the modulated green light to the polarization conversion element and directly enters and passes through the light-converting layer after being converted by the polarization conversion element; The light prism is configured to combine the incident light incident on the combined aperture to form a projection beam; the specific wavelength polarization conversion element is disposed in the exit direction of the combined aperture for converting the polarization state of the green light; The polarizer is disposed at a direction in which the polarization conversion element emits light of the specific wavelength, and is configured to pass red light, green light, and blue light in a specific polarization direction. 096128602 Form No. A0101 Page 13 of 16 1003304206-0 1356272 The color management system of claim 1, wherein the color management system further includes a projection. a lens disposed in a direction of an outgoing light of the analyzer for amplifying an image formed by the emitted light of the analyzer. The color management system of claim 1, wherein the polarization conversion element is a one-half wave plate. The color management system of claim 3, wherein the one-half wave plate is superposed by two quarter-wave plates. The color management system of claim 1, wherein the analyzer is a polarizer. The color management system of claim 1, wherein the spatial light modulator is a germanium-based liquid crystal panel. The color management system of claim 1, wherein the spatial light modulator is configured to correct corresponding incident light and superimpose an image signal on the corresponding incident light to form the corresponding The incident light and the corrected outgoing light of the image signal. The color management system of claim 1, wherein the light source is a halogen lamp. 9. The color management system of claim 1, wherein the light source is a metal halide lamp. 096128602 Form No. A0101 Page 14 of 16 1003304206-0