WO2004086136A1 - 光学ユニット及びそれを用いた投写型映像表示装置 - Google Patents
光学ユニット及びそれを用いた投写型映像表示装置 Download PDFInfo
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- WO2004086136A1 WO2004086136A1 PCT/JP2004/004321 JP2004004321W WO2004086136A1 WO 2004086136 A1 WO2004086136 A1 WO 2004086136A1 JP 2004004321 W JP2004004321 W JP 2004004321W WO 2004086136 A1 WO2004086136 A1 WO 2004086136A1
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- Prior art keywords
- light
- optical
- reflective
- reflection
- polarizer
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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
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
Definitions
- the present invention relates to an optical unit that causes light from a light source to be incident on a reflection type image display element and enlarges and projects the light reflected by the reflection type image display element with a projection lens, and a projection type image display apparatus using the same. Things. Gastric technique
- a projection-type image equipped with an optical unit that forms an optical image by performing light intensity modulation that changes the shading of the light from a light source with an image signal using an image display element, and forms an enlarged image of the optical image with a projection lens Display devices are known.
- the image display element a transmission type liquid crystal panel, a reflection type liquid crystal panel, a micro mirror panel, and the like are known.
- Patent Document 1 Japanese Patent Publication No. 2001-142020.
- a polarizing beam splitter (hereinafter referred to as PBS) prism is used as a polarizer and analyzer.
- PBS polarizing beam splitter
- the light emitted from the light source is deflected in a certain direction by a polarization conversion element, and is incident on a PBS prism.
- Incident light is reflected by the PBS film surface and enters the reflective liquid crystal panel.
- the polarization state of light incident on the reflective liquid crystal panel is modulated for each pixel according to the video signal.
- the light reflected by the reflective liquid crystal panel enters the PBS prism again, and only the light whose polarization state is modulated passes through the PBS prism and is enlarged and projected by the projection lens.
- this technique reduces leakage light that occurs when oblique light that is not parallel to the plane formed by the optical axis and the normal to the PBS film surface (main incident surface) enters the PBS prism.
- a quarter-wave plate is indispensable for this purpose, but the effect is not perfect, so there is a problem that the contrast cannot be increased.
- Non-Patent Document 1 Optically Flat Polarizing Beamsplitters: Catalog No. PBF 02 A of Moxtek, USA (May 2002)”. Disclosure of the invention
- Non-Patent Document 1 a color wheel is used as a means for displaying a color image, but in this case, since the light amount aperture at the time of transmission through the color wheel is approximately 2/3, the light use efficiency is reduced. Brightness cannot be obtained unless low-power, high-power lamps are used. Also, since a reflective polarizer is used as the auxiliary analyzer, a ghost image may be generated. The contrast is still not enough, and further improvement is needed.
- optical unit for a projection-type image display device using a reflection-type image display device which is small and lightweight and has good image quality performance such as brightness, contrast, and resolution, has been considered.
- image quality performance such as brightness, contrast, and resolution
- FIG. 8 is a diagram showing the optical unit.
- 1 is a light source
- 2 is an optical axis of an optical unit
- 3 is a rod lens having an integrator function and having a polarization conversion function.
- Reference numerals 41, 42, and 43 denote imaging lenses for irradiating an image of the exit of the load lens 3 onto the reflective liquid crystal panels 111, 112, and 113.
- 5 is white reflection mirror
- 6 is B transmission
- RG reflection dichroic mirror is 1
- 7 is R transmission
- G reflection dichroic mirror is
- 8 is B reflection mirror
- 91, 92, 93 are absorption or reflection type.
- R auxiliary polarizer, G auxiliary polarizer, B auxiliary Auxiliary polarizer 101 ', 102', 103 5 are then it for R using a diffraction grating reflective polarizer, G-use reflection-type polarization plate, B-use reflection-type polarizing plate, hatched portion is a working surface .
- 1 1 1, 1 12 and 1 13 are reflective LCD panels for R, G reflective LCD panels, B reflective LCD panels, 121, 122, and 123 are absorption-type auxiliary analyzers for R A auxiliary analyzer for G, an auxiliary analyzer for B, 132 is a half-wave plate for G, 14 is a cross dichroic prism, and 15 is a projection lens.
- the auxiliary polarizers 91, 92, 93 and the auxiliary analyzers 121, 122, 123 are arranged or formed on a transparent parallel plate substrate.
- R indicates red
- G indicates green
- B indicates blue.
- the R light transmitted through the R transmission G reflection dichroic mirror 17 enters the auxiliary polarizer 91 for R.
- Light in the polarization direction orthogonal to the absorption axis or the reflection axis of the R auxiliary polarizer 91 (here, P-polarized light) passes through the R auxiliary polarizer 91 and is incident on the R reflective polarizer 101.
- the reflection type polarizing plate for R 10 I 3 using a diffraction grating is arranged such that the reflection axis parallel to the grating direction is substantially parallel to the absorption axis or the reflection axis of the R auxiliary polarizer 91.
- the light that has entered the reflective polarizer 10 1 ′ for R is transmitted and enters the reflective liquid crystal panel 11 1 for R.
- the G light reflected by the R transmission G reflection dichroic mirror 7 enters the G auxiliary polarizer 92. As with R light, it is orthogonal to the absorption axis or reflection axis of the G auxiliary polarizer 92
- the light in the polarization direction passes through the auxiliary polarizer for G 92 and enters the reflective polarizer for G 102 ′.
- the reflection polarizer for G 102 ′ using a diffraction grating is arranged so that the reflection axis parallel to the grating direction is substantially parallel to the absorption axis or the reflection axis of the auxiliary polarizer 92 for G.
- the light that has entered the reflective polarizing plate 102 ′ is transmitted and enters the G reflective liquid crystal panel 112.
- the B light transmitted through the RG reflection dichroic mirror 6 transmits through the imaging lens 43.
- the direction of the light beam is bent by 90 ° by the B reflection mirror 18 and is incident on the B auxiliary polarizer 93.
- the optical path length of the B light is different from the RG light and the optical path length. Therefore, by arranging the relay lenses 44 and 45 in the B optical path, an image is formed on the reflective liquid crystal panel 113 for B.
- the light incident on the auxiliary polarizer for B 93 is polarized in a direction perpendicular to the absorption axis or the reflection axis of the auxiliary polarizer for B 93 (here, P-polarized light). Incident on the reflection type polarizing plate 103 ′.
- the reflection type polarizing plate 103 for B using a diffraction grating is arranged such that the reflection axis parallel to the grating direction is substantially parallel to the absorption axis or the reflection axis of the auxiliary polarizer 93 for B.
- the light incident on the reflective liquid crystal panel 111 for R, the reflective liquid crystal panel 112 for G, and the reflective liquid crystal panel 113 for B are respectively reflected on the reflective liquid crystal panel 111 for R, the reflective liquid crystal panel 112 for G, and the reflection for B.
- the polarized light is rotated by 90 ° to become S-polarized light, and the R-use reflective polarizer 101 ⁇ G-use reflective polarizer 102 'and B-use reflective type The light enters the polarizing plate 103 '.
- the incident light is S-polarized light and is parallel to the reflection axis, it is reflected by the R reflective polarizer 10, the G reflective polarizer 102 ′, and the ⁇ reflective polarizer 103 ′, and the direction of the light beam is reflected.
- the light is bent by 90 ° and enters the auxiliary analyzer 121 for R, the auxiliary analyzer 122 for G, and the auxiliary analyzer 123 for ⁇ .
- Reflective polarizer 101 5, 102 ', 103 5 light reflected by the transmitted through the auxiliary analyzer 121, 1 22, 123, RB remains S-polarized light
- G is over through a G for 1/2-wavelength plate 132
- the light becomes P-polarized light
- all of the R, G, and B lights enter the cross dichroic prism 14.
- the R, G, and B lights are combined into a white color by the cross dichroic prism 14, and are enlarged and projected on a screen (not shown) by the projection lens 15.
- a polarizing beam splitter prism (hereinafter referred to as a PBS prism) is used as a polarizer and an analyzer.
- PBS prisms have a dielectric multilayer film surface, and transmit P-polarized light and reflect S-polarized light through the film surface (hereinafter referred to as PBS film).
- PBS film the film surface
- a quarter-wave plate is indispensable. Even if a quarter-wave plate is used, the effect is not perfect.
- the quarter-wave plate has wavelength characteristics and angular characteristics, and its function decreases as the incident light wavelength moves further away from the design center wavelength and as the incident angle increases. . Therefore, in an optical unit having a certain wavelength range and a certain angle range for light incident on a reflective liquid crystal panel, the effect of reducing leakage light for all incident light is not perfect.
- the above-mentioned reflective polarizing plates 101, 102 ', 103 act as polarizing plates by having a grid effect only in a specific direction, reflect polarized light parallel to the grating direction, and are orthogonal to the grating direction. Transmits polarized light.
- the reflective polarizers 101, 102 ', and 103 exhibit the best polarization separation performance when their reflection axes are arranged parallel to the optical axis and the normal to the plane including the normal of the reflective polarizer.
- the reflection axis when the reflection axis is arranged parallel to the S-polarization direction with respect to the optical axis ray, the S-polarized light of the optical axis ray is reflected and the degree of polarization of the transmitted light and the reflected light is highest when used to transmit the P-polarized light. Become. Therefore, they are arranged as such in this configuration.
- the reflective polarizer reflects polarized light parallel to the grating direction and changes polarized light orthogonal to the grating direction. Although transmitted, a small amount of polarized light that is parallel to the grating direction is actually transmitted, and a small amount of polarized light that is orthogonal to the grating direction is reflected and the contrast is reduced. Therefore, auxiliary polarizers 91, 92, and 93 are provided on the input side, and auxiliary analyzers 121, 122, and 123 are provided on the output side to reduce leakage light during black display and provide an optical unit with good contrast performance. And
- auxiliary analyzers 121, 122, and 123 are of an absorption type, generation of a ghost image can be suppressed.
- the reflective polarizers 101, 102, 103 since air is present between the optical paths from the reflective liquid crystal panels 111, 112, 113 to the cross dichroic prism 14, the reflective polarizers 101, 102, 103 'were used.
- the optical length from the lens on the cross dichroic prism side of the projection lens 15 to each of the reflective liquid crystal panels 111, 112, and 113 (this is called back focus) becomes long. For this reason, there is a problem that the projection lens becomes large, which is disadvantageous for reducing the size and weight of the optical unit.
- misalignment the permissible value of the misalignment of each of the reflective liquid crystal panels 111, 112, and 113 (hereinafter, referred to as misalignment) is also about half.
- the output of the lamp is increased, and the illumination optical system is also made more efficient, so that the light energy applied to the panel is increased and the temperature rise is also increased.
- the holding members that hold the reflective liquid crystal panels 111, 112, and 113 thermally expand, and the positions of the reflective liquid crystal panels 111, 112, and 113 shift, and the misalignment occurs. There is a problem that it becomes easier.
- the temperature of the reflective liquid crystal panel, reflective polarizer, auxiliary polarizer, and auxiliary analyzer has increased more than before. It is cooled by a fan in order to reduce to some extent.
- outside air is taken into the device by a fan, and is cooled by exposing each optical member to the outside air.
- the inlet is filled with dust, it cannot completely prevent dust (dust, dust, etc.), and there is also a problem that dust adheres to the surface of optical components.
- increasing the number of fans or increasing the size of the fans to increase the air flow in order to suppress the temperature rise has the disadvantage of increasing the noise.
- the present invention has been made in view of the above problems, and has as its object to provide an optical unit that has been reduced in size and weight, and a projection display apparatus using the optical unit.
- light from a light source is separated into a plurality of color lights by a color separation unit, and the plurality of color lights are incident on corresponding reflective image display elements.
- An optical unit that forms an optical image corresponding to a video signal using the polarization characteristics of the video display element, combines the optical images for each of the color lights with color combining means, and magnifies and projects with a projection lens.
- a reflection type polarization plate acting as a polarization plate by diffraction is provided as a polarizer and an analyzer for the reflection type image display device, It holds a reflective polarizer and the reflective image display element, has a light-transmitting window on the incident light side of the reflective polarizer, and has an output light side of the reflective polarizer on an incident surface of the color combining means.
- An optical chassis sealed with A closed space is formed by the chassis, the reflective image display element, and the incident surface of the color synthesizing means, and the closed space is filled with a translucent fluid having a refractive index of 1.2 to 1.9. I do.
- an auxiliary polarizer is provided on the incident side of the reflective polarizing plate and an auxiliary analyzer is provided on the exit side. It may be provided.
- the auxiliary polarizer is provided in place of the light transmission window of the optical chassis, and the auxiliary analyzer is mounted on the incident surface of the color separation means.
- the closed space is filled with the translucent fluid having a small difference in the refractive index from the optical component, the light reaches the front color separation unit from the reflection type image display device via the front reflection type polarizing plate.
- the optical length of the optical path can be made smaller than that of an air medium, and the projection lens can be downsized.
- reflection at the interface of the front optical component can be reduced, it is not necessary to provide antireflection to the front optical component, and the cost can be reduced.
- the pre-translucent fluid also functions as a cooling medium, the temperature rise of the front optical components can be reduced, the deviation of the converter can be reduced, and the fan for cooling is eliminated or the number of rotations is reduced. It is possible to reduce the noise generated by the fan.
- the size and weight of the projection display apparatus can be reduced.
- FIG. 1 is a plan view of an optical unit according to the first embodiment of the present invention.
- FIG. 2 is a side view of the optical chassis of the optical unit according to the first embodiment of the present invention.
- FIG. 3 is a diagram showing an embodiment of a holding mechanism for the R reflection type polarizing plate.
- FIG. 4 is a plan view of the optical unit according to the second embodiment of the present invention.
- FIG. 5 is a plan view of an optical unit according to the third embodiment of the present invention.
- FIG. 6 is a schematic diagram of a projection device equipped with an optical unit according to an embodiment of the present invention.
- FIG. 7 shows an embodiment in which a projection device equipped with an optical unit according to the present invention is applied to a rear projection type video display device.
- FIG. 8 is a plan view of a conventional optical unit. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram showing a first embodiment of the optical unit according to the present invention
- FIG. 2 is a side view of the optical chassis unit of FIG.
- FIG. 1A is a plan view of the optical unit
- FIG. 1B is an enlarged configuration diagram of the reflective polarizer.
- components having the same functions as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted.
- FIGS. 1 components having the same functions as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted.
- 16 1, 16 2, and 16 3 are an optical chassis for R, an optical chassis for G, and an optical chassis for B, respectively, and 101, 102, and 103 are These are the reflective polarizer for R, the reflective polarizer for G, and the reflective polarizer for B, each using a diffraction grating, and 1 7 1 7 1 7 2 and 1 7 3 are translucent for R, respectively.
- Reference numeral 18 denotes a radiation fin.
- Figure 1 (b) the diffraction grating as shown in the form of action surface (hatched portion) 1 0 1 a structure in which sandwiched by the transparent member 1 0 1 2, the inner portion Filled with optical adhesive (not shown) to prevent air from intervening.
- a configuration may be employed in which a diffraction grating as an operation surface is formed on a transparent member, and a transparent coating is applied on the operation surface to protect the operation surface (not shown).
- the G-type reflective polarizer 102 and the B-type reflective polarizer 103 have the same configuration.
- an auxiliary polarizer 91 for R, a liquid crystal panel surface of a reflective liquid crystal panel 111 for R, and a cross dich-open prism 14 equipped with an auxiliary analyzer 121 for R are mounted.
- a closed space is formed by the entrance surface of the optical system and the optical chassis for R 16 1.
- the optical path area of the R light from the auxiliary polarizer for R 91 to the entrance surface of the cross dichroic prism 14 is referred to as an R light block.
- Optical chassis for R 1 6 1 (: R translucent window) 16 1, is provided, and the R opening 16 1, is covered with the R auxiliary polarizer 91 and the R reflective liquid crystal panel 111.
- An elastic body such as an O-ring (not shown) is provided between the R auxiliary polarizer 91, the reflective LCD panel 111 for R, and the entrance surface of the cross dichroic prism 14 and the optical chassis 16 1 for R. ), And the elastic body is pressed and sealed.
- the R transmission port 16 covered with the R auxiliary polarizer 91 is provided on the incident light side of the R reflection type polarizing plate 101.
- the R passage port 16 1 ′ that covers the reflective liquid crystal panel 11 1 is provided on the incoming / outgoing light side of the R reflective polarizing plate 101.
- the R reflective LCD panel 1 1 1 is held on the R optical chassis 16 1 by the R holding member 1 1 1 ′, and the R auxiliary polarizer 91 is also held by a holding member (not shown). Have been.
- FIG. 4 is a cross-sectional view taken along the line B-B 'of FIG.
- R-use reflection-type polarizing plate 1 0 1 grooves 1 6 1 5 a is provided top member 1 6 1 a and the bottom member 1 6 1 alligator R optical chassis 1 6 1 1 6 1 , B.
- a sealed space is formed on the G light block and B light block sides. That is, on the G light block side, the auxiliary polarizer 92 for G, the liquid crystal panel surface of the reflective liquid crystal panel 112 for G, the auxiliary analyzer 122 for G and the half-wave plate 1 for G
- a closed space is formed by the entrance surface of the cross dichroic prism 14 equipped with 32 and the optical chassis for G 16 2.
- the light entrance and exit of the optical chassis for G 16 2 as in the optical chassis for R 16 1, above, allow the G to pass through (light transmissive window for G) 16 2 ′ so that light can pass through.
- the G passage 16 2 ′ is covered with the G auxiliary polarizer 92 and the G reflective LCD panel 112, and the G auxiliary polarizer 92 and the G reflection are provided.
- An elastic body (not shown) such as an O-ring is interposed between the two, and the elastic body is pressed and sealed.
- the G reflective LCD panel 1 1 2 is held on the G optical chassis 16 2 by the G holding member 1 1 2 ′, and the G auxiliary polarizer 9 2 is also held by the holding member (not shown). Have been. Further, the G-use reflective polarizing plate 102 in the above-mentioned closed space is also held by the G-use optical chassis 162 in the same manner as the R light block side, and the description thereof is omitted.
- the auxiliary polarizer 93 for B, the liquid crystal panel surface of the reflective liquid crystal panel 113 for B, and the cross dichroic prism 14 fitted with the auxiliary analyzer 123 for B are mounted on the B light block side.
- a closed space is formed by the incident surface of the optical system and the optical chassis for B 16 3.
- the light passes through the B passage (B Window) 16 3, is provided, and the passage opening 16 3, B for B is covered with the auxiliary polarizer 9 B for B and the reflective liquid crystal panel 13 13 for B.
- the reflective LCD panel 113 for B is held on the optical chassis 163 for B by holding members 113 for B, and the auxiliary polarizer 93 for B is also held by a holding member (not shown). Have been.
- the B-type reflective polarizing plate 103 in the above-mentioned closed space is also held by the B-type optical chassis 163 in the same manner as the R-light block side and the G-light block side, and a description thereof will be omitted.
- each incident surface of the cross dichroic prism 14 constitutes one wall surface of each optical chassis.
- auxiliary polarizers 91, 92, 93, the reflective polarizers 101, 102, 103, the reflective liquid crystal panels 111, 112, 113, and the auxiliary analyzers 121, 122, 123 (hereinafter referred to for convenience) Since these are collectively referred to as optical components), dust does not enter from the outside and dust can be prevented from adhering to the optical components.
- a transparent fluid 171 for R having a refractive index of 1.2 or more and 1.9 or less is provided in each of the sealed spaces in the sealed optical chassis 161 for R, the optical chassis 162 for G, and the optical chassis 163 for B.
- a translucent fluid 172 for G and a translucent fluid 173 for B are filled.
- the optical path from the reflective liquid crystal panel 111 for R to the auxiliary analyzer 121 for R via the reflective polarizer 101 for R is in the translucent fluid 171 for R, and the reflective liquid crystal panel 112 for G
- the optical path from the reflective liquid crystal panel 102 for G to the auxiliary analyzer 122 for G is in the translucent fluid 172 for G, and from the reflective liquid crystal panel 113 for B to the auxiliary liquid crystal panel 103 for B via the reflective liquid crystal panel 103 for B.
- the translucent fluid 171 for R, the translucent fluid G for G, and the translucent fluid B for B having a refractive index of 1.2 or more and 1.9 or less, a fluorinated inert liquid (refractive index 1.25 to 1.5), ethylene glycol (refractive index: 1.43), glycerin (refractive index: 1.47), glycerin-ethylene glycol mixture (refractive index: 1.45), etc.
- the refractive indices of the R translucent fluid 171, G translucent fluid 172, and B translucent fluid 173 are R reflective liquid crystal panel 111, G reflective liquid crystal panel 112, B reflective Liquid crystal panel 113, reflective polarizer for R 101, reflective polarizer for G 102, reflective for B Index of optical components that are in contact with the R translucent fluid 17 1, G translucent fluid 17 2, B translucent fluid 17 3, etc.
- the refractive index of the optical glass or the optical plastic used for the optical component is about 1.4 to 1.5. Therefore, since the refractive index of the glycerin.ethylene glycol mixed liquid is 1.45, it is suitable as the translucent fluid for R 17 the translucent fluid for IG 17 2 and the translucent fluid for B 17 3 It is. It goes without saying that any material not listed here can be used as long as it satisfies the above conditions.
- the refractive indices of the R translucent fluid 17 1, the G translucent fluid 17 2, and the B translucent fluid 1 73 are selected to be substantially equal to the refractive indices of the optical components.
- the reflective polarizer for R 101, the reflective polarizer for G 102, and the reflective polarizer for B 103 are each a translucent fluid for R 17 1 and a translucent fluid for G 1 7 2 ⁇ Reflective polarizing plate for R 10 0 I 3 , reflective type for G 10 2 ′ shown in Fig. 8
- the translucent fluid for R 171, the translucent fluid for G 172, and the translucent fluid for B Corrosion may occur due to 173. Therefore, the working surface as described in FIG.
- the reflection liquid crystal panel for R, the reflection liquid crystal panel for G, and the reflection liquid crystal panel for B, among the light reflected from the reflection liquid crystal panel for R, are: 1, Reflective liquid crystal panel for G 1 1 2, Reflective liquid crystal panel for B 1 13
- the plate 102 and the reflective polarizer 103 for B are reflected, and are incident on the auxiliary analyzer for R 121, the auxiliary analyzer for G 122, and the auxiliary analyzer for B 123.
- the light passes through the glass parts of the reflective polarizer for R 101, the reflective polarizer for G 102, and the reflective polarizer for B 103 at the time of incidence and reflection.
- the reflective polarizers for R 101, G Reflective polarizing plate 102 for B and reflective polarizing plate 103 for B are translucent fluids for R 17 1, translucent fluid for G 17 2, and translucent fluid for B 17 3 Since they are arranged at a low refractive index, the difference in refractive index is small and astigmatism hardly occurs.
- the R translucent fluid 17 1, the G translucent fluid 17 2, and the B translucent fluid 17 3 also function as cooling media.
- the heat generated by the incident light is partially It is transmitted to the R holding member 1 1 1 ′, the G holding member 1 1, 2, and the B holding member 1 1 3 ′ and is discharged to the outside.
- Most other heat is translucent for R Fluid 171, translucent fluid for G 1 72, and translucent fluid for B 1 73 are absorbed.
- Auxiliary polarizer for R 9 1, Auxiliary polarizer for G 92, Auxiliary polarizer for B 93, Auxiliary analyzer for R 1 2 1, Auxiliary analyzer for G 1 2 2, Auxiliary analyzer for B 1 2 3
- the heat generated on the polarization plane Most of the light can be absorbed by the translucent fluid for R 171, the translucent fluid for G172, and the translucent fluid for B173.
- the reflective polarizer 101 for R, the reflective polarizer 102 for G, and the reflective polarizer 103 for B also transmit most of the heat generated in the same manner as the above optical components. It can be absorbed by optical fluids 17 1, 17 2 17 3.
- Translucent fluid for R 1 7 1, translucent fluid for G 1 7 2, translucent fluid for B 1 7 3 The heat absorbed by translucent fluid for R 1 7 1 and translucent for G Fluid 1 72, optical translucent fluid for B 1 73 3
- optical chassis for R 16 1, optical chassis for G 16 2, optical chassis 16 for B move in optical chassis 16 3, and R Optical chassis 16 1, G optical chassis 16 2, and B optical chassis 16 3. Therefore, the optical chassis for R 16 1, the optical chassis for G 16 2, and the optical chassis for B 16 3 are made of metal such as Fe, Cu, Al, Mg, etc. They are made of a material with excellent thermal conductivity including them to promote heat radiation to the outside.
- the heat radiation efficiency can be increased.
- the outer walls of the optical chassis for R, the optical chassis for G, the optical chassis for B, and the optical chassis for B are forcibly cooled by a direct cooling fan (not shown) without using the radiation fins. This also increases the efficiency of heat dissipation. In this case, since a cooling fan smaller than the conventional one is sufficient, noise can be reduced.
- optical chassis for R 16 1, optical chassis for G 16 2, optical chassis for B 1 By providing the radiation fin 18 on the outer wall of 63 and forcibly cooling it with a cooling fan, the heat radiation effect can be further enhanced.
- R holding member 1 1 1 ', G holding member 1 1 2', B holding member 1 which is absorbed by optical fluid 17 2 and B translucent fluid 17 13 ' is made of metal such as Fe, Cu, Al, and Mg and its alloys, and materials containing them and having excellent thermal conductivity to suppress the rise in liquid crystal surface temperature more than before.
- the reflective LCD panel for R 1 1 1, the reflective LCD panel for G 1 1 2, the reflective LCD panel for B 1 1 3, R holding member 1 1 1 5 , G holding member 1 1 2 5, B for holding member 1 1 3 'it is possible to suppress generation of convergence deviation due to thermal expansion. It is more effective to forcibly cool the R holding member 1 1 1 ⁇ G holding member 1 1 2 ⁇ B holding member 1 13 with a cooling fan.
- the lifetime of the reflective LCD panel for R, the reflective LCD panel for G, and the reflective LCD panel for B is inversely proportional to the temperature of the LCD during operation. With this configuration, the temperature of the liquid crystal surface during operation can be lower than before, and the reflective LCD panel for R, the reflective LCD panel for G, the reflective LCD panel for B, Life can be extended.
- FIG. 4 is a view showing a second embodiment of the optical unit according to the present invention.
- Fig. 4 In the figure, 16 is an optical chassis, and 17 is a translucent fluid.
- components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the arrangement of the optical components is the same as that of the first embodiment shown in FIG. 1, the optical performance is also the same, and the description is omitted, and only the new effects will be described.
- the arrangement of the optical components is the same as that of the first embodiment of FIG. 1, but in the first embodiment of FIG.
- the optical chassis 161, the optical chassis 16 for G, the optical chassis 16 for B, the optical chassis 16 for B, and the optical chassis that are separate components for each of the R, G, and B blocks have been changed to an optical chassis 16 that is integrated. It has a special feature. Therefore, the optical chassis 16, the reflective liquid crystal panels 1 1 1, 1 1 2, 1 13, the auxiliary polarizers 9 1, 9 2, 9 3, and the auxiliary analyzers 1 2 1, 1 2 2, 1 An enclosed space consisting of a cross dichroic prism 14 fitted with a 1/2 wavelength plate 13 2 for 23 or G is also integrated, and the translucent fluid 17 filled inside is also R, G A, B can move each block.
- the cooling efficiency can be increased. It goes without saying that the cooling efficiency can be further increased by providing a heat radiation fin 18 on the outer wall of the optical chassis 16 or forcibly cooling by a cooling fan (not shown).
- the optical chassis of the Rs G ⁇ B block is integrally formed to form only one closed space.
- the present invention is not limited to this.
- the optical chassis of the adjacent R and G blocks may be formed.
- the chassis may be integrated into one, and the R and G blocks may be used as one closed space. Needless to say, the volumes of the R, G, and B blocks forming one closed space may be different.
- FIG. 5 is a view showing a third embodiment of the optical unit according to the present invention.
- Fig. 5 In the figure, 2 16 is an optical chassis. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.
- the reflective liquid crystal panel for R, the reflective liquid crystal panel for G, and the reflective liquid crystal panel for B in the second embodiment are different from each other.
- the arrangement of 3 is such that the light reflected by each liquid crystal panel is parallel to the incident surface of the cross dichroic prism 14 where the light enters. Therefore, unlike the first and second embodiments, the reflective polarizers 101, 102, and 103 reflect incident light (P-polarized light) polarized in a predetermined direction, and the reflective type for R
- the reflection axis is set so as to face the liquid crystal panel 111, the reflective liquid crystal panel 112 for G, and the reflective liquid crystal panel 113 for B.
- the auxiliary analyzers for R, 121, G, and B auxiliary analyzers have their absorption axes reflected by the reflective polarizing plates 101, 102, and 103. It is set to be approximately parallel to the axis.
- the passage port 1 6 1 5 (the passage port of the reflective liquid crystal panel 1 11 for R and the auxiliary Are not orthogonal to each other but are orthogonal to each other.
- the passages 16 2 ′ and 16 3 are also orthogonal.
- the optical paths of R, G, and B are the same as those of the first and second embodiments up to the auxiliary polarizer 91 for R, the auxiliary polarizer 92 for G, and the auxiliary polarizer 93 for B. It is the same as the optical unit.
- the R light incident on the R auxiliary polarizer 91 is light in a polarization direction perpendicular to the absorption axis or the reflection axis of the R auxiliary polarizer 91 (here, P-polarized light).
- the light passes through 1 and is incident on the reflection type polarizing plate 101 for R.
- the reflection axis parallel to the grating direction is almost orthogonal to the absorption axis or the reflection axis of the auxiliary polarizer 91 for R (first and second embodiments).
- the light incident on the reflective polarizer 101 for R is reflected and the direction of the light beam is bent 90 °, so that the reflective liquid crystal panel for R 1 1 1 Incident on.
- the G light incident on the G auxiliary polarizer 92 has light in the polarization direction perpendicular to the absorption axis or the reflection axis of the G auxiliary polarizer 92 (here, P-polarized light), and the G auxiliary light.
- the light passes through the polarizer 92 and is incident on the G-use reflective polarizing plate 102.
- the reflection polarizer for G 102 using a diffraction grating is arranged so that the reflection axis parallel to the grating direction is substantially perpendicular to the absorption axis or the reflection axis of the auxiliary polarizer 92 for G.
- the light incident on the G-use reflective polarizing plate 102 is reflected, the direction of the light beam is bent by 90 °, and enters the G-use reflective liquid crystal panel 112.
- the B light incident on the B auxiliary polarizer 93 has a polarization direction (here, P-polarized light) orthogonal to the absorption axis or reflection axis of the B auxiliary polarizer 93.
- a polarization direction here, P-polarized light
- the reflective polarizer 103 for B enters the reflective polarizer 103 for B. Since the reflection type polarizing plate 103 for B using a diffraction grating is arranged such that the reflection axis parallel to the grating direction is substantially orthogonal to the absorption axis or the reflection axis of the auxiliary polarizer 93 for B.
- the light incident on the reflective polarizer 103 for reflection is reflected, the direction of the light beam is bent by 90 °, and is incident on the reflective liquid crystal panel 113 for B.
- the light enters the reflective polarizing plate for G 102 and the reflective polarizing plate 103 for B.
- the incident light is S-polarized light and is orthogonal to the reflection axis, it passes through the reflective polarizer for R 101, the reflective polarizer for G 102, and the reflective polarizer for B 103.
- Auxiliary analyzer for G 1 2 2 and auxiliary analyzer for B 1 2 3 The absorption axes of the auxiliary analyzer for R 1 2 1, the auxiliary analyzer for G 1 2 2, and the auxiliary analyzer for B 1 2 3 are the reflective polarizer for R 101, the reflective polarizer for G 102, The reflective polarizers for R and G are arranged so as to be substantially parallel to the reflection axis of the reflective polarizer for B 103 and the reflective polarizer for G 101 and G, respectively.
- the light that has passed through the reflective polarizer 103 for B is reflected by the auxiliary analyzer for R 121, and the auxiliary detector for G. Photons 1 and 2 pass through auxiliary analyzer 1 and 2 for B, R and B lights remain S-polarized light, and G light passes through 1/2 wavelength plate 13 and 2 for G and become P-polarized light, and R and G And B light enter the cross dichroic prism 14.
- the R, G, and B lights are combined into white by the cross dichroic prism 14, and are enlarged and projected on a screen (not shown) by the projection lens 15.
- the reflective LCD panel for R the reflective LCD panel for G
- the reflective LCD panel for B the reflective LCD panel for R
- the light corresponding to the pixel whose polarization has been changed by the reflective liquid crystal panel 1 1 2 and the reflective liquid crystal panel 1 13 for B is reflected by the R reflective polarizer 101 and the G reflective polarizer 10 0. 2.
- the light passes through the reflective polarizer 103 for B and enters the auxiliary analyzer for R 121, the auxiliary analyzer for G 122, and the auxiliary analyzer for B 123.
- the light passes through the glass portions of the reflective polarizer 101 for R, the reflective polarizer 102 for G, and the reflective polarizer 103 for B at the time of incidence and emission.
- the reflective polarizer for R 101, the reflective polarizer for G 102, and the reflective polarizer for B 103 are formed of a translucent fluid 17. Since they are arranged in a space, the difference in refractive index is small and astigmatism hardly occurs.
- the reflective liquid crystal panel for R 111 and the reflective liquid crystal panel for B 113 can be arranged at a position away from the projection lens 15, so that the holding member 1 1 1 ⁇ This has the effect of increasing the degree of freedom in the structure of (1) and (3) and the configuration of the adjustment mechanism (not shown).
- the first and second Compared with the case where the image light as in the embodiment is reflected by the reflective polarizers 101, 102, and 103 and enters the auxiliary analyzers 121, 122, and 123, It is possible to reduce the misalignment caused by heat due to the deformation of the reflective polarizers 101, 102, and 103 caused by the heat.
- the optical chassis is formed of the optical chassis 2 16, but may be configured differently from the optical chassis for R, the optical chassis for G, and the optical chassis for B as in the first embodiment shown in FIG. .
- the optical chassis for R similarly to the R and B lights, the light reflected by the G reflection type liquid crystal panel 112 is reflected by the G reflection type polarizing plate 102.
- the configuration is such that only the G light is transmitted, the light reflected on the reflective liquid crystal panel for G 112 as in the first and second embodiments reflects on the reflective polarizer for G 102. Such a configuration may be adopted.
- FIG. 5 the third embodiment shown in FIG.
- the reflective axes of the reflective polarizers 101, 102, and 103 are configured so as to reflect P-polarized light and transmit S-polarized light.
- the configuration may be such that the light is reflected in the S-polarized light and transmitted in the P-polarized light.
- the output polarized light from the load lens is S-polarized with respect to the reflective polarizers 101, 102, and 103, and the auxiliary polarizers 91, 92, and 93 absorb the S-polarized light.
- Auxiliary analyzers 12 1, 12 2, 12 3 are directed in the direction of the absorption axis that transmits P-polarized light, and R is placed between the auxiliary analyzer for R and the cross dichroic prism 14. Insert the half-wave plate for B, insert the half-wave plate for B between the auxiliary polarizer for B and the cross dichroic prism 14, and delete the half-wave plate for G.
- the auxiliary polarizer is arranged on the incident side of the reflective polarizer and the auxiliary analyzer is arranged on the output side.However, when the reflective polarizer has sufficient transmission / reflection characteristics and the contrast can be ensured. Needless to say, the auxiliary polarizer and the auxiliary analyzer may be omitted. In this case, the place where the auxiliary polarizer is provided on the optical chassis may be replaced with a light transmitting window. Since the auxiliary analyzer was attached to the cross dichroic prism, it was simply deleted.
- FIG. 6 is a schematic view of a projection device equipped with the optical unit according to the embodiment of the present invention. 6, elements having the same functions as those in FIGS. 1, 4, and 5 are denoted by the same reference numerals.
- a projection device 310 is a light source according to the above-described embodiment of the present invention.
- the display unit 300 includes a learning unit 300 and a display driving circuit 301 for performing display driving so as to form an optical image on a liquid crystal panel.
- the function of the projection device 310 will be described.
- the light from the light source 1 is adjusted to a predetermined polarization by a polarization conversion element (for example, a rod lens 3 in FIG. 1) not shown, and is separated by a color separation means (for example, dichroic mirrors 6, 7 in FIG. 1).
- a polarization conversion element for example, a rod lens 3 in FIG. 1
- a color separation means for example, dichroic mirrors 6, 7 in FIG. 1).
- G, and B light are separated and applied to the reflective liquid crystal panel 1 1 1 (1 1 2, 1 13).
- the reflective liquid crystal panel 1 1 1 (1 1 2, 1 1 3) the polarization direction of the predetermined polarization is changed for each color light according to the video signal from the display drive circuit 301, and the light is changed to the density of each color light.
- the light intensity modulation is performed to form an optical image.
- FIG. 7 shows an embodiment in which the above-mentioned projection device is applied to a rear projection type video display device which is one form of a projection type video display device, and is a schematic cross-sectional view as viewed from the side.
- the projected image light from the projection device 310 is turned back in the direction of the screen 3112 by the rear mirror 3111, and is projected from the rear side of the screen 3112.
- Reference numeral 313 denotes a housing of the rear projection type video display device.
- the panel side of the reflective liquid crystal panel, the reflective polarizer, the auxiliary analyzer, the auxiliary polarizer, and the cross dichroic prism are provided in a sealed optical chassis.
- a configuration is employed in which the sealed interior is filled with a translucent fluid 17 having a refractive index of 1.2 or more and 1.9 or less.
- the translucent fluid also functions as a cooling medium, a rise in the temperature of the reflective liquid crystal panel can be suppressed, and thus a deviation in comparability due to thermal expansion of the holding member can be suppressed.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/525,514 US7241015B2 (en) | 2003-03-27 | 2004-03-26 | Optical unit and projection type image display unit using it |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-86909 | 2003-03-27 | ||
JP2003086909A JP2004294758A (ja) | 2003-03-27 | 2003-03-27 | 光学ユニット及びそれを用いた投写型映像表示装置 |
Publications (1)
Publication Number | Publication Date |
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WO2004086136A1 true WO2004086136A1 (ja) | 2004-10-07 |
Family
ID=33095081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/004321 WO2004086136A1 (ja) | 2003-03-27 | 2004-03-26 | 光学ユニット及びそれを用いた投写型映像表示装置 |
Country Status (4)
Country | Link |
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US (1) | US7241015B2 (ja) |
JP (1) | JP2004294758A (ja) |
CN (1) | CN100458555C (ja) |
WO (1) | WO2004086136A1 (ja) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7347561B2 (en) * | 2001-08-06 | 2008-03-25 | Jds Uniphase Corporation | Image display device |
JP4622695B2 (ja) * | 2004-08-27 | 2011-02-02 | 日本ビクター株式会社 | 投射型表示装置 |
KR100672357B1 (ko) * | 2004-10-04 | 2007-01-24 | 엘지전자 주식회사 | Led 면광원 및 이를 이용한 투사표시장치 |
JP2006285044A (ja) * | 2005-04-01 | 2006-10-19 | Konica Minolta Opto Inc | 投射型画像表示装置 |
JP4652112B2 (ja) * | 2005-04-26 | 2011-03-16 | 富士フイルム株式会社 | 投射型表示装置 |
JP4910317B2 (ja) * | 2005-07-04 | 2012-04-04 | 株式会社ニコン | 投射型表示装置 |
JP5167642B2 (ja) * | 2007-01-24 | 2013-03-21 | 株式会社Jvcケンウッド | 投射型表示装置 |
JP2011227404A (ja) * | 2010-04-22 | 2011-11-10 | Sony Corp | 光学装置及び投影装置 |
JP5867037B2 (ja) * | 2011-12-07 | 2016-02-24 | セイコーエプソン株式会社 | プロジェクター |
ES1123905Y (es) * | 2014-08-19 | 2015-01-23 | Teylor Intelligent Processes Sl Empresa | Sistema magnético para bomba de camara estanca |
CN109507843B (zh) * | 2017-09-14 | 2022-01-21 | 扬明光学股份有限公司 | 合光模组 |
JP6996287B2 (ja) * | 2017-12-26 | 2022-01-17 | トヨタ自動車株式会社 | 車室内照明装置 |
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- 2004-03-26 US US10/525,514 patent/US7241015B2/en not_active Expired - Fee Related
- 2004-03-26 WO PCT/JP2004/004321 patent/WO2004086136A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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JP2004294758A (ja) | 2004-10-21 |
US20060126020A1 (en) | 2006-06-15 |
CN100458555C (zh) | 2009-02-04 |
US7241015B2 (en) | 2007-07-10 |
CN1701268A (zh) | 2005-11-23 |
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