WO2006001188A1 - 液晶プロジェクタ装置 - Google Patents
液晶プロジェクタ装置 Download PDFInfo
- Publication number
- WO2006001188A1 WO2006001188A1 PCT/JP2005/010796 JP2005010796W WO2006001188A1 WO 2006001188 A1 WO2006001188 A1 WO 2006001188A1 JP 2005010796 W JP2005010796 W JP 2005010796W WO 2006001188 A1 WO2006001188 A1 WO 2006001188A1
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- WO
- WIPO (PCT)
- Prior art keywords
- liquid crystal
- light
- polarizing plate
- crystal panel
- angle
- Prior art date
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3167—Modulator illumination systems for polarizing the light beam
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1393—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/01—Function characteristic transmissive
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/01—Number of plates being 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/10—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates with refractive index ellipsoid inclined, or tilted, relative to the LC-layer surface O plate
Definitions
- the present invention relates to a liquid crystal projector device using a liquid crystal element of vertical alignment type, and more particularly to a liquid crystal projector device which improves both the contrast and the response speed.
- the liquid crystal projector device disclosed in this publication includes a lamp 102 in which a light emitting portion 102b is disposed at a focal position of a reflector 102a. The light emitted from the lamp 102 is also emitted forward as the light substantially parallel to the optical axis of the reflector 102a.
- the lamp 102 has an external form which has a shape substantially similar to the aspect ratio of the irradiated area of the liquid crystal panel formed of the liquid crystal panel 110, 113, 119 described later.
- a multi-lens array 103 in which a plurality of lens cells are squarely arranged, and a plurality of lens cells are formed to face the lens cells of the multi-lens array 103. Is placed! The light condensed by these multi-lens arrays 103 and 104 is polarized by the polarization conversion block 105 into light of a predetermined polarization direction.
- non-polarized light emitted from the lamp 102 The light of P polarized light wave + S polarized light wave is converted into light of a predetermined polarization direction (for example, P polarized light wave) corresponding to the liquid crystal panel portions 110, 113, 119 by passing through the polarization conversion block 105.
- the description of the polarization conversion block 105 is omitted.
- the light converted into, for example, P-polarized light by the polarization conversion block 105 is incident on a plano-convex lens 106 disposed downstream of the polarization conversion block 105.
- the plano-convex lens 106 condenses the light from the polarization conversion block 105 so that the liquid crystal panel can be illuminated efficiently.
- the light emitted from the plano-convex lens 106 first enters the dichroic mirror 107 which transmits the red light R, where the red light R is transmitted and the green light G and the blue light B are reflected.
- the red light R transmitted through the dichroic mirror 107 is bent by, for example, 90 ° in the traveling direction by the mirror 108 and is guided to the liquid crystal panel unit 110 through the plano-convex lens 109.
- the green light G and the blue light B reflected by the dichroic mirror 107 are separated by the dichroic mirror 111 that transmits the blue light B. That is, the green light G is reflected and guided to the liquid crystal panel unit 113 through the plano-convex lens 112.
- the blue light B passes straight through the dik-ported index mirror 111 and is guided to the liquid crystal panel 119 through the relay lens 114, the mirror 115, the relay lens 116, the mirror 117 and the plano-convex lens 118.
- the cross prism 120 is formed, for example, by bonding a plurality of glass prisms to form an outer shape. Further, on the bonding surface of each glass prism, interference filters 121a and 121b having predetermined optical characteristics are formed.
- the interference filter 121a is configured to reflect red light R and transmit green light G
- the interference filter 121b is configured to reflect blue light B and transmit green light G.
- the red light R is transmitted through the interference filter 121a and the blue light B through the interference filter 121b to reach the projection lens 122, where each color light is combined into one optical axis.
- the liquid crystal projector device 100 configured as described above has a problem that the contrast is lowered according to the viewing angle.
- the twisting of twistotropic nematic liquid crystal molecules constituting the liquid crystal panel may be mentioned as a factor causing the strong viewing angle characteristics.
- it is considered as normally white which is disposed between the polarizing plates 130 and 133.
- the alignment of the liquid crystal molecules of the liquid crystal panel 132 is shown. In the alignment films 132a and 132b, arrows shown by solid lines are taken as the alignment processing direction.
- the alignment direction of the liquid crystal molecules has a predetermined angle with respect to the alignment treatment direction called a pretilt angle.
- This is the angle of the initial molecular alignment given with respect to the alignment treatment direction in order to guide the drive direction of the liquid crystal molecules when the drive voltage is applied.
- the contrast is improved by disposing the retardation film 131 between the polarizing plate 130 and the liquid crystal panel 132.
- the first polarizing plate 130 disposed on the incident side has, for example, a polarization axis in the z-axis direction, and the light flux passing through the polarizing plate 130 is transmitted to the retardation film 131.
- the retardation film 131 one of the slow axis or the fast axis of the retardation film 131 is orthogonal to the polarization axis of the polarizing plate 130, and the retardation film 131 is formed to form a surface within a plane!
- the polarizing plate 130 is disposed so as to be inclined at a predetermined angle with the axis parallel to the polarization axis of the polarizing plate 130 as the rotation axis.
- the alignment processing direction of the alignment film 132a is the X axis direction
- the alignment processing direction of the alignment film 132b is the y axis direction.
- the liquid crystal molecules are aligned with a required pretilt angle. Therefore, the polarization axis of the polarizing plate 130 and the alignment direction of the liquid crystal molecules have an angular difference corresponding to the pretilt angle.
- the retardation film 131 corrects this angle difference so that the phase of the light beam transmitted through the polarizing plate 130 corresponds to the arrangement of liquid crystal molecules of the alignment film 130 a having a pretilt angle.
- the above-described conventional liquid crystal projector device is not suitable for twisted nematic as a liquid crystal element.
- Power Using Liquid Crystal In liquid crystal projector apparatuses provided recently, vertical alignment type liquid crystal elements are being used to achieve higher brightness, higher contrast, and higher definition. Although this vertical alignment type liquid crystal element can obtain a very high contrast ratio, when it is disposed in a liquid crystal projector device, a so-called transverse electric field in a direction parallel to the substrate surface which is particularly strongly generated. As a result, the alignment direction of the liquid crystal molecules may be disturbed, and the transmittance may be reduced.
- transmission liquid crystal elements are mainly used as liquid crystal elements for use in liquid crystal projector devices from the viewpoint of ease of manufacture, and attempts have been made to achieve high performance by vertically aligning these elements. .
- a method of applying an oblique electric field realized in a direct-viewing type liquid crystal element that suppresses the disorder of the alignment of liquid crystal molecules due to a lateral electric field, or providing an inclined portion in a pixel Although it is conceivable to apply an orientation control method such as the above, it is at the expense of the ratio (aperture ratio) of the aperture area to the display area, and it is possible to apply it to a liquid crystal element for a very high definition projector. Can not.
- the pretilt angle of the liquid crystal molecules of the vertical alignment type by controlling the pretilt angle of the liquid crystal molecules of the vertical alignment type, the disturbance of the alignment of the liquid crystal molecules due to the transverse electric field is suppressed, and the transmittance of the liquid crystal panel 132 is improved. Ways to improve are also proposed.
- the problem is that the high contrast ratio, which is an advantage of the vertical alignment type liquid crystal device, can not be realized, and it is difficult to realize a transmissive liquid crystal projector device equipped with the vertical alignment type liquid crystal device. become.
- the present invention has been proposed to solve the above-mentioned problems, and the object of the present invention is to provide a high contrast ratio in a transmission type liquid crystal projector mounted with a vertical alignment type liquid crystal element. Improve the transmittance of the liquid crystal panel while maintaining the Another object of the present invention is to provide a liquid crystal projector capable of improving the response speed.
- the liquid crystal projector device has a first polarizing plate and a second polarizing plate respectively disposed on the incident side and the output side of the liquid crystal element, and the first light polarizing plate and the second light polarizing plate respectively
- the first polarized light component is transmitted through the first polarizing plate to guide it to the liquid crystal element
- the second polarized light component in the light flux emitted from the liquid crystal element is transmitted through the second polarizing plate to the projection lens.
- a polarization control means for guiding, and a retardation means comprising an optical anisotropic element disposed between the first polarizing plate and the liquid crystal element or between the second polarizing plate and the liquid crystal element;
- a means is to tilt the optically anisotropic element in accordance with the alignment direction of liquid crystal molecules in the liquid crystal element.
- the light source, the illumination optical system for converging the emitted light flux on the required light path, and the light flux collected by the illumination optical system are vertically aligned.
- a liquid crystal projector comprising a liquid crystal element light-modulated by liquid crystal molecules and a projection lens projecting a light beam modulated by the liquid crystal element, the first polarized light being respectively disposed on the incident side and the output side of the liquid crystal element.
- a polarization control means between the first polarizing plate and the liquid crystal element, or the second polarizing plate and the liquid crystal Element And an optical anisotropic element disposed at an angle according to the orientation direction of liquid crystal molecules in the liquid crystal element by the phase difference means. is there.
- the liquid crystal projector device is configured by rotating the optically anisotropic element according to the pretilt angle OC of the liquid crystal molecules in the liquid crystal panel 5, the transmittance of the liquid crystal panel is maintained while maintaining a high contrast ratio. It is possible to improve response speed as well as improve
- FIG. 1 is a side view showing a conventional liquid crystal projector device.
- FIG. 2 is a perspective view showing the configuration of twist nematic liquid crystal molecules constituting the liquid crystal panel.
- FIG. 3 is a perspective view showing a configuration in which a retardation film is disposed between a polarizing plate and a liquid crystal panel.
- FIG. 4 is a side view showing a liquid crystal projector device according to the present invention.
- FIG. 5 is a perspective view showing a liquid crystal panel used in the liquid crystal projector device according to the present invention.
- FIG. 6 is a perspective view showing a configuration from the incident side polarizing plate to the output side polarizing plate in the liquid crystal projector device according to the present invention.
- FIGS. 7A and 7B are characteristic diagrams showing contrast characteristics in the liquid crystal projector device according to the present invention.
- FIG. 8 is a diagram showing a state in which an electric field is applied as in 1-line inversion driving between liquid crystal element substrates.
- FIG. 9 is a view showing a display state obtained by arranging an optical anisotropy element inclined in angle.
- FIGS. 10A and 10B are characteristic diagrams showing contrast characteristics when the pretilt angle ⁇ of liquid crystal molecules is small.
- FIGS. 11A and 11B show the relationship between the contrast characteristics, the transmittance, and the response speed of the liquid crystal element with respect to the pretilt angle ⁇ .
- FIGS. 12A and 12B are diagrams showing a configuration in which an optically anisotropic element is obliquely cut out and sandwiched between media.
- FIG. 13A is a front view showing a compensator tilting mechanism for changing the rotation angle ⁇ of the optical anisotropic element
- FIG. 13B is a side view thereof.
- the liquid crystal projector device 1 projects an image onto an external screen, and as shown in FIG. 4, the light source 11 for emitting light and the optical path order of the light emitted from the light source 11 are visible.
- a plurality of lens cells are, for example, arranged in a square, so as to polarize light from the first multi-lens array 14 and the second multi-lens array 15 and the second multi-lens array 15 in a predetermined polarization direction.
- the light source 11 is adapted to emit white light including red, green and blue lights, which are the three primary colors of light, which are required to project a full color image.
- a light source 11 includes a light emitting body 11 a that emits white light, and a reflector l ib that reflects light emitted from the light emitting body 11 a.
- a discharge lamp in which a gas containing a mercury component is enclosed, for example, a super high pressure mercury lamp or the like is used.
- the reflector l ib of the light source 11 is a concave mirror whose mirror surface has a shape with good circumferential efficiency.
- the reflector l ib is, for example, in the form of a rotationally symmetric surface such as a rotating square object surface or a rotating ellipsoidal surface.
- the cut filter 12 is a flat mirror that removes the light in the ultraviolet region contained in the white light emitted from the light source 11 by reflecting it.
- the cut filter 12 is, for example, a glass substrate coated with a coating that reflects light in the ultraviolet range, and transmits light other than the ultraviolet range.
- the first multi-lens array 14 is a second multi-lens array In order to illuminate the inside of the effective area of the liquid crystal panel 25 which will be described later with reference 15 uniformly, the light is made to be a luminous flux in the form of the effective area of the liquid crystal panel 25 to make the illuminance distribution uniform.
- the first multi-lens array 14 has a structure in which a plurality of small lens elements are provided in an array, and light reflected by the first folding mirror 13 is collected by each lens element to make a small point light source And combine the illumination light from each point light source by the other second multi-lens array 15.
- the condenser lens 17 is a convex lens, and adjusts the spot diameter so that the light controlled in the predetermined polarization direction by the PS synthetic resin 16 is efficiently irradiated to the effective aperture area of the liquid crystal panel 25.
- the first dichroic mirror 20 is a wavelength selective mirror in which dielectric films are formed in multiple layers on a main surface such as a glass substrate, and so-called dichroic coating is applied.
- the first dichroic aperture mirror 20 separates the red light to be reflected and the other color light to be transmitted, ie green light and blue light.
- the first dichroic mirror 20 transmits blue light and green light of the light incident from the condenser lens 17, reflects red light in a substantially vertical direction, and changes the 90 ° direction, It is disposed at an angle of 45 ° in the vertical direction with respect to the optical path of light incident from the condenser lens 17.
- the liquid crystal projector device 1 includes a second folding mirror 22 that totally reflects the light and a first field lens 23R that condenses the light in the order of the optical path of the red light separated by the first dichroic mirror 20.
- a first emission side polarizing plate 26R for transmitting light in only a component of a predetermined polarization direction.
- the second reflection mirror 22 is a total reflection mirror that reflects the light reflected by the first dichroic mirror 20 in the vertical direction to change its direction by 90 °, and is perpendicular to the optical path of the reflected red light. It is arranged at an angle of 45 ° in the direction. Thereby, the second folding mirror 22 reflects the red light toward the first field lens 23R.
- the first field lens 23R is a condensing lens that forms an illumination optical system together with the condenser lens 17, and outputs the red light reflected by the second folding mirror 22 to the first incident side polarization plate 24R side. Focus on the first liquid crystal panel 25R.
- the first incident side polarizing plate 24R is a polarizing plate configured to transmit only the component of the predetermined polarization direction to the red light output from the first field lens 23R.
- the first incident-side polarization plate 24R is disposed such that the transmission axis and the alignment direction of the liquid crystal molecules on the substrate surface on the incident side of the first liquid crystal panel 25R form a 45 ° angle.
- the first liquid crystal panel 25R is a transmissive panel using vertically aligned liquid crystal molecules. Vertically aligned liquid crystal molecules are enclosed between two transparent substrates (not shown). Such a first liquid crystal panel 25R changes the state of liquid crystal molecules according to the video signal input corresponding to red video information, and is incident through the first incident side polarization plate 24R. Modulate and transmit red light spatially.
- the first liquid crystal panel 25R has a substantially rectangular shape in which the image to be projected is longer in the horizontal direction than in the vertical direction, so the incident surface is made substantially rectangular corresponding to this! / Scold.
- the first exit side polarization plate 26R transmits the red light modulated by the first liquid crystal panel 25R only to the component in the polarization direction orthogonal to the first incidence side polarization plate 24R.
- the first emission side polarization plate 26R is disposed such that the transmission axis and the alignment direction of the liquid crystal molecules on the surface of the substrate on the emission side of the first liquid crystal panel 25R form a 45 ° angle. That is, the first exit side polarizing plate 26R is disposed in a so-called orthogonal Nicole relationship in which the light transmission axes are orthogonal to each other with respect to the first incident side polarizing plate 24R.
- the liquid crystal projector device 1 separates the incident light according to the wavelength band along the optical path of the other color light separated by the first dichroic mirror 20, that is, the blue light and the green light.
- a dichroic mirror 31 is provided.
- the second dichroic mirror 31 separates the incident light into blue light and other color light, that is, green light.
- the second dichroic mirror 31 transmits blue light of the light incident from the first dichroic mirror 20, reflects green light in the substantially horizontal direction of the image projection unit 2, and changes the 90 ° direction. As described above, they are disposed at an angle of 45 ° in the vertical direction with respect to the optical path of the light incident from the first dichroic mirror 20.
- the liquid crystal projector device 1 includes a second field lens 23G for condensing light and a second element for transmitting light only in a predetermined polarization direction, in the order of the light path of the green light separated by the second dichroic mirror 31. And a second liquid crystal panel 25G that spatially modulates light, and a second emission side polarizing plate 26G that transmits light only in a predetermined polarization direction.
- the second field lens 23G is a condenser lens that forms an illumination optical system together with the condenser lens 17, and the second incident light of the green light reflected by the second dichroic mirror 31 The light is output to the side polarizing plate 24G side and condensed on the second liquid crystal panel 25G.
- the second incident side polarizing plate 24G is a polarizing plate configured to transmit only the component of the predetermined polarization direction of the green light output from the second field lens 23G.
- the second incident-side polarization plate 24G is disposed such that the transmission axis and the alignment direction of the liquid crystal molecules on the substrate surface on the incident side of the second liquid crystal panel 25G form a 45 ° angle.
- the second liquid crystal panel 25G is a transmission type panel using liquid crystal molecules of vertical alignment type, and such liquid crystal molecules of vertical alignment type are enclosed between two transparent substrates (not shown).
- the second liquid crystal panel 25G changes the state of the liquid crystal molecules according to the video signal input corresponding to the green video information, and the light is incident through the second incident side polarizing plate 24G. Spatially modulate and transmit the green light.
- the second liquid crystal panel 25 G has a substantially rectangular shape on the image to be projected, and the incident surface is thus substantially rectangular in shape.
- the second exit-side polarization plate 26G transmits only the component in the polarization direction orthogonal to the second incident-side polarization plate 24G, of the green light modulated by the second liquid crystal panel 25G.
- the second output side polarization plate 26G is disposed such that the transmission axis and the alignment direction of the liquid crystal molecules on the surface of the substrate on the output side of the second liquid crystal panel 25G form a 45.degree. 26G is disposed so as to have a so-called orthogonal-correlated relationship in which light transmission axes are orthogonal to each other with respect to the second incident side polarizing plate 24G.
- the liquid crystal projector device 1 includes a first relay lens 33 for adjusting the optical path length in order of the optical path of the blue light separated by the second dichroic mirror 31 and a third relay lens for totally reflecting the incident light.
- a folding mirror 34, a second relay lens 35 for correcting the optical path length, a fourth folding mirror 36 for totally reflecting incident light, a third field lens 23B for condensing light, and a predetermined number of incident light The third incident side polarizing plate 24B which transmits only the component in the polarization direction, the third liquid crystal panel 25B which spatially modulates the incident light, and the third emission side which transmits only the component in the predetermined polarization direction And a polarizing plate 26B.
- the first relay lens 33 is a lens for adjusting the optical path length together with the second relay lens 35, and the blue light separated by the second dichroic mirror 31 is converted to a third return mirror 34. Lead to.
- the third folding mirror 34 reflects the light from the first relay lens 33 horizontally. It is a total reflection mirror that changes the direction of 0 °, and is disposed at an angle of 45 ° in the vertical direction with respect to the optical path of the blue light from the first relay lens 33. Thus, the third folding mirror 34 reflects blue light from the first relay lens 33 toward the second relay lens 35.
- the second relay lens 35 together with the first relay lens 33 It is a lens for adjusting the optical path length, and guides the blue light reflected by the third folding mirror 34 to the fourth folding mirror 36.
- the first relay lens 33 and the second relay lens 35 have optical path powers to the third liquid crystal panel 25B of blue light, an optical path to the first liquid crystal panel 25R of red light, and a second light path of green light. Since the liquid crystal panel 25G is longer than the light path, it is corrected so that the blue light is properly guided to focus on the third liquid crystal panel 25B.
- the fourth reflection mirror 36 is a total reflection mirror that reflects the light from the second relay lens 35 in the vertical direction and changes the direction to 90 °, and in the optical path of the blue light from the second relay lens 35 It is arranged at an angle of 45 ° in the vertical direction. Thereby, the fourth folding mirror 36 reflects blue light from the second relay lens 35 toward the third field lens 23B.
- the third field lens 23B is a condensing lens that forms an illumination optical system together with the condenser lens 17, and outputs the blue light reflected by the fourth folding mirror 36 to the third incident side polarizing plate 24B side. Focus on the third liquid crystal panel 25B.
- the third incident side polarizing plate 24B is a polarizing plate configured to transmit the blue light output from the third field lens 23B only for the component of the predetermined polarization direction.
- the third incident-side polarization plate 24B is disposed such that the transmission axis and the alignment direction of the liquid crystal molecules on the substrate surface on the incident side of the third liquid crystal panel 25B form a 45 ° angle.
- the third liquid crystal panel 25 B is a transmission type panel using liquid crystal molecules of vertical alignment type, and liquid crystal molecules of vertical alignment type are sealed between two transparent substrates (not shown). Such a third liquid crystal panel 25B changes the state of the liquid crystal molecules according to the video signal input corresponding to the blue video information, and is incident through the third incident side polarizing plate 24B. Spatially modulate and transmit blue light.
- the third LCD panel 25B has almost no projected image Since it is rectangular, the incident surface is substantially rectangular corresponding to this.
- the third exit-side polarizing plate 26B transmits the blue light modulated by the third liquid crystal panel 25B only to the component in the polarization direction orthogonal to the third incident-side polarizer 24B.
- the third emission side polarization plate 26B is disposed such that the transmission axis and the alignment direction of the liquid crystal molecules on the surface of the substrate on the emission side of the third liquid crystal panel 25B form a 45 ° angle. That is, the third exit-side polarization plate 26B is disposed in a so-called orthogonal Nicole relationship in which light transmission axes are orthogonal to each other with respect to the third incident-side polarization plate 24B.
- the liquid crystal projector device 1 is spatially modulated by the first liquid crystal panel 25R, the second liquid crystal panel 25G and the third liquid crystal panel 25B and transmitted through the output side polarization plates 26R, 26G, 26B.
- a synthesis prism 38 for synthesizing these red light, green light and blue light and the synthesis light synthesized by the synthesis prism 38 are projected toward the screen And a projection lens 41 for.
- the composite prism 38 receives the red light emitted from the first liquid crystal panel 25R and transmitted through the first emission side polarizing plate 26R, and is emitted from the second liquid crystal panel 25G and transmits the second emission side polarization plate 26G.
- the synthetic prism 38 synthesizes the incident red light, green light and blue light and emits the synthesized light from the emission surface 38T.
- the projection lens 41 magnifies and projects the combined light emitted from the exit surface 38T of the combining prism 38 onto a screen.
- FIG. 5 is a perspective view of the liquid crystal panel 25.
- the liquid crystal panel 25 is configured by superposing the incident side liquid crystal element substrate 41 a from which the incident light is incident from the incident side polarizing plate 24 and the emission side liquid crystal element substrate 41 b.
- the liquid crystal molecules of vertical alignment type are enclosed in.
- a voltage application section 42 for applying a voltage to the liquid crystal element is connected to the emission side liquid crystal element substrate 41b.
- FIG. 6 shows a detailed configuration from the incident side polarizing plate 24 to the output side polarizing plate 26 in the liquid crystal projector device 1 to which the present invention is applied.
- Vertically aligned liquid crystal molecules 25a sandwiched between the incident side liquid crystal element substrate 41a and the emission side liquid crystal element substrate 41b are The homeo mouth pick is oriented at an angle ⁇ from the plate normal.
- this angle ⁇ is referred to as a pretilt angle.
- the pretilt angle ⁇ of the liquid crystal molecules is 12 ° and giving a strong alignment regulating force, the liquid crystal molecules are assumed to be disordered in any transverse electric field.
- this pretilt angle oc is within the range of 1 ° to 20 ° because 20 ° is sufficient for obtaining an alignment control force to oppose the transverse electric field during one-line reverse drive.
- the optically anisotropic element 45 is placed between the incident side polarizing plate 24 and the liquid crystal panel 25. Angle of
- the optically anisotropic element 45 is a negative uniaxial phase plate, and for example, a polystyrene polymer, an acrylic acid ester type polymer, a methacrylic acid ester type polymer, an acrylonitrile type polymer, a methacrylonitrile type polymer It is made of materials such as This optically anisotropic element 45 is suitable for use as a projector, for example, Ti.sub.2O.sub.3.
- the optical anisotropic element 45 may be coated with an anti-reflection film that minimizes light loss due to reflection, since the optical anisotropic element 45 is disposed at an angle to the incident light beam.
- the reflectance of the optically anisotropic element 45 after coating with the antireflective film is preferably 1% or less, more preferably 0.5% or less.
- optical anisotropic element 45 having such a configuration, for example, as shown in FIG. 6, in other words, optical anisotropy so as to be in a direction orthogonal to the alignment direction of liquid crystal molecules.
- the surface force parallel to the liquid crystal element substrate 41 is also rotated about the optical axis P of the element 45 by an angle ⁇ .
- the rotational direction at this time is substantially the same as the pretilt direction of the liquid crystal molecules.
- FIG. 7 when the optically anisotropic element 45 having a retardation (And) of ⁇ 427 nm is disposed so that
- the liquid crystal molecules are inclined by the pretilt angle ⁇ , if the liquid crystal molecules are not removed by inclining the optical anisotropic device 45, the front contrast is significantly deteriorated and the viewing angle characteristics are simultaneously deteriorated. I understand.
- the And of the liquid crystal molecules at the time of finding the tendency in Fig. 7 by calculation was set to 427 nm. It is desirable that the A nd of the optically anisotropic element 45 and the A nd of the liquid crystal molecules have the same absolute value and the same sign but the correction is possible even if there is an error of about ⁇ 50 nm. . This A nd is 300 ⁇ ! When a transmissive and vertical alignment liquid crystal element is used. Although designed in the range of -500 nm, it is also possible to optimize A nd with red light, green light and blue light.
- the liquid crystal projector device 1 to which the present invention is applied is applied as a transmission type three-plate type liquid crystal projector device, it is general to set the pretilt angle ⁇ of the liquid crystal molecules to 12 °.
- the arrangement of the optically anisotropic element 45 inclined as described above provides a good display as shown in FIG. The state is obtained.
- the optically anisotropic element 45 is disposed between the incident side polarizing plate 24 and the liquid crystal panel 25, and the optically anisotropic element 45 is substantially the same as the pretilt angle a of the liquid crystal molecules in the liquid crystal panel 25. Rotate by j8. This can further improve the contrast.
- FIG. 11A and FIG. 11B show the relationship between the contrast characteristic, the transmittance, and the response speed of the liquid crystal element with respect to the pretilt angle ⁇ .
- the contrast can be further increased by setting the pretilt angle ⁇ small before optical compensation by the optical anisotropic device 45. If the pretilt angle ⁇ is set small in one-line reverse drive, the domain will be generated and the transmittance will be extremely reduced, and the response speed will be slow as shown in FIG. 11B.
- the contrast (after optical compensation) can be 2000: 1 or more as shown in FIG. It is possible to do good.
- the present invention is useful in that the response speed and the transmittance of the liquid crystal element can be further improved and the contrast can be further improved. In other words, it is possible to realize a high quality liquid crystal projector device with improved moving image characteristics.
- a vapor deposition film which also has an inorganic property can be used as the alignment film of the liquid crystal, and no special axis inclination processing is required for the optically anisotropic element 45. Since it can be composed of a multilayer film of an acid oxide, it can be composed of an inorganic material in the portion excluding the liquid crystal in any device, and it is possible to further improve the light resistance.
- the divergence angle of incident light can be expanded, and a more brighter / projector can be realized. It becomes possible.
- the rotational angle 13 of 45 may be anything as long as it corresponds to the pretilt angle a.
- the optically anisotropic element 45 may be inclined at an angle such that the direction perpendicular to the alignment direction of the liquid crystal molecules in the liquid crystal panel 25 is the rotation axis.
- this rotation angle ⁇ may correspond to the refractive index ⁇ of the liquid crystal panel 25 and the refractive index ⁇ of the medium from the liquid crystal panel 25 to the optically anisotropic element 45.
- the angular rotation angle ⁇ can be expressed by the following equation (1) based on Snell's law.
- FIG. 12A shows a configuration in which the optically anisotropic element 45 is sandwiched between the media 51 cut obliquely.
- the rotation angle ⁇ is the refractive index of the medium 51 up to the optical anisotropic element 45. It can be obtained from equation (1) according to ⁇ .
- the cutout angle of the medium 51 is expressed by the equation (1).
- FIG. 12B shows an example in which the optically anisotropic element 45 whose axis is inclined in advance is disposed directly on the liquid crystal panel 25.
- the axis of the optical anisotropic element 45 shown in FIG. 12B is controlled to the rotation angle j8 according to the refractive index. For this reason, it is possible to improve the contrast characteristics etc. in the same way even in a configuration that is under pressure.
- the liquid crystal projector device 1 to which the present invention is applied is not limited to the embodiment described above.
- the rotation angle j8 of the optical anisotropic element 45 may be freely changed.
- FIGS. 13A and 13B show a compensator tilt mechanism 7 for changing the rotation angle
- the compensation plate tilting mechanism 7 includes an optical compensation plate fixing portion 71 for fixing the optical anisotropic element 45 and a tilting axis 72 for rotating the optical compensation plate fixing portion 71 in the direction of arrow P in FIG. 13B. And a rotary ring 73 for rotating the optical compensator fixing portion 71 in the direction of the arrow Q in FIG. 13A, and a pedestal 74 disposed around the rotary ring 73.
- the rotational angle j8 can be more finely adjusted.
- the optically anisotropic element 45 is disposed in the compensator tilt mechanism 7. It becomes possible to implement
- the pretilt angle a of the liquid crystal molecules in the liquid crystal panel 25 is a liquid crystal projector device.
- 8 of the optically anisotropic element 45 is also slightly different. Therefore, by disposing the optical anisotropic element 45 in the compensator tilt mechanism 7 having the above-described configuration, the rotational angle ⁇ positioned in the manufacturing stage is slightly finely adjusted afterward by a slight adjustment. It becomes possible to optimize.
- liquid crystal projector device 1 to which the present invention is applied is applied to a field-controlled birefringence system (ECB: Electrically Controlled Birefringence) which is not limited to the case of using a vertical alignment type liquid crystal element. It is a matter of course that you can do it.
- EB Electrically Controlled Birefringence
- the liquid crystal projector device 1 to which the present invention is applied is not limited to the case where the optical anisotropic element 45 is disposed between the incident side polarization plate 24 and the liquid crystal panel 25, and the outgoing side polarization plate 26 and the liquid crystal Of course, it may be disposed between the panel 25.
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/571,368 US7659946B2 (en) | 2004-06-29 | 2005-06-13 | Liquid crystal projector |
EP05748834A EP1762883A4 (en) | 2004-06-29 | 2005-06-13 | LIQUID CRYSTAL PROJECTOR |
KR1020067027543A KR101244062B1 (ko) | 2004-06-29 | 2005-06-13 | 액정 프로젝터 장치 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-191938 | 2004-06-29 | ||
JP2004191938A JP2006011298A (ja) | 2004-06-29 | 2004-06-29 | 液晶プロジェクタ装置 |
Publications (1)
Publication Number | Publication Date |
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WO2006001188A1 true WO2006001188A1 (ja) | 2006-01-05 |
Family
ID=35778603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/010796 WO2006001188A1 (ja) | 2004-06-29 | 2005-06-13 | 液晶プロジェクタ装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US7659946B2 (ja) |
EP (1) | EP1762883A4 (ja) |
JP (1) | JP2006011298A (ja) |
KR (1) | KR101244062B1 (ja) |
CN (1) | CN100510904C (ja) |
TW (1) | TWI281075B (ja) |
WO (1) | WO2006001188A1 (ja) |
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US7570328B2 (en) | 2004-09-08 | 2009-08-04 | Seiko Epson Corporation | Liquid crystal device and projection display device |
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JP6939798B2 (ja) | 2016-08-30 | 2021-09-22 | ソニーグループ株式会社 | 光学補償素子、液晶表示装置および投射型表示装置 |
JP6868380B2 (ja) | 2016-12-09 | 2021-05-12 | デクセリアルズ株式会社 | 位相差補償素子、液晶表示装置及び投射型画像表示装置 |
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US11054702B2 (en) | 2018-02-20 | 2021-07-06 | Sony Corporation | Optical compensation device, liquid crystal display unit, and projection display apparatus |
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CN112859227A (zh) | 2019-11-28 | 2021-05-28 | 迪睿合株式会社 | 相位差补偿元件、液晶显示装置及投射型图像显示装置 |
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US8049823B2 (en) * | 2006-10-27 | 2011-11-01 | Seiko Epson Corporation | Projector, optical compensation method therefor, and liquid crystal device |
CN101169577B (zh) * | 2006-10-27 | 2011-12-28 | 精工爱普生株式会社 | 投影机、其光学补偿方法以及液晶装置 |
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Also Published As
Publication number | Publication date |
---|---|
EP1762883A4 (en) | 2008-03-12 |
KR20070035520A (ko) | 2007-03-30 |
CN100510904C (zh) | 2009-07-08 |
US20080043158A1 (en) | 2008-02-21 |
TWI281075B (en) | 2007-05-11 |
JP2006011298A (ja) | 2006-01-12 |
KR101244062B1 (ko) | 2013-03-18 |
US7659946B2 (en) | 2010-02-09 |
EP1762883A1 (en) | 2007-03-14 |
TW200619785A (en) | 2006-06-16 |
CN1977213A (zh) | 2007-06-06 |
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