JP5028330B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a structure of a liquid crystal display device that displays an image using a liquid crystal panel.

  In a liquid crystal display device that displays an image using a liquid crystal panel, a polarizing plate that selectively transmits light polarized in a specific direction before and after the liquid crystal panel that modulates the polarization state of light to generate an image Is installed. In this configuration, light polarized in one direction (for example, the horizontal direction) enters the liquid crystal panel, and the polarization direction changes according to the image signal intensity of each pixel in the liquid crystal panel. Therefore, if a polarized component in a specific direction in this light is taken out, output light whose intensity is modulated according to the image signal can be obtained. In the liquid crystal projector, the output light is further enlarged and projected through an optical system.

  At this time, an organic polarizing plate in which an organic polarizing film is formed on a transparent plate can be used as the polarizing plate. Since the polarizing plate having this structure can be constructed at low cost, there is a merit that it is inexpensive. However, the material of the organic polarizing film generally has low heat resistance. On the other hand, in the organic polarizing plate, the light of the polarization component that does not pass through it is absorbed and becomes heat. This heat deteriorates the organic material, adversely affects the light transmission characteristics, and causes unevenness in the image. Deterioration may occur. For this reason, particularly in the case of increasing the brightness of an image, the structure as described above has a poor heat dissipation property, and deterioration due to this heat occurs. In particular, in a liquid crystal projector, the light intensity of a mercury lamp serving as a light source is high, and since the size of the liquid crystal panel is small, the light irradiation energy density becomes high, and this influence becomes large.

  Therefore, the liquid crystal projector employs a configuration in which a plurality of organic polarizing plates are used before and after the liquid crystal panel to disperse this heat load and to introduce cooling air between them. FIG. 8 is a top view showing the configuration of an example of the optical unit in the liquid crystal projector. In the figure, liquid crystal panels 111 (Blue), 112 (Green), and 113 (Red) are used corresponding to each color of RGB. Illumination lights corresponding to Blue, Green, and Red are incident on the liquid crystal panel 111 from the right side, 112 from the lower side, and 113 from the left side, respectively. The light that has passed through each of these liquid crystal panels passes through three organic polarizing plates, namely, outgoing organic polarizing plates 114 to 116, 117 to 119, and 120 to 122, respectively. As a general example, each of Red and Blue incident polarizing plates selectively transmits light having a horizontal polarization component, and the corresponding output organic polarizing plates 120 to 122 and 114 to 116 have vertical polarization components. Selectively transmits light. In Green, on the contrary, the incident polarizing plate selectively transmits light having a polarization component in the vertical direction, and the output organic polarizing plates 117 to 119 selectively transmit light having a polarization component in the horizontal direction. In FIG. 8, the configuration on the incident side of each liquid crystal panel is omitted.

  The light of Blue, Green, and Red emitted from each of the output organic polarizing plates 116, 119, and 122 is intensity-modulated for each pixel of each liquid crystal panel, synthesized by the dichroic prism 123, and enlarged and projected by the projection lens unit 124. Is displayed. Here, in each outgoing organic polarizing plate, light that has not passed through it is absorbed in each organic polarizing plate (organic polarizing film) and becomes heat. By gradually absorbing light having a polarization component other than the transmission direction by the organic polarizing plate, the light polarized in the transmission direction for each color is selectively transmitted. The same applies to the incident side not shown in FIG.

  Here, the liquid crystal panels 111 to 113 are fixed to the LCD mounting plates 125 to 127, respectively, and the three outgoing organic polarizing plates are fixed to the polarizing plate fixing portions 128 to 130 provided with grooves for fitting them. The Here, a gap for introducing cooling air is provided between the three outgoing organic polarizing plates, and the same applies to each liquid crystal panel and the outgoing organic polarizing plate adjacent thereto.

  Also, a fan (not shown) for cooling (air cooling) them is provided, and the cooling air generated thereby passes between the outgoing organic polarizing plates as described above, and cools them. Furthermore, in order to suppress deterioration of the organic polarizing film in the output organic polarizing plate, it is preferable to use sapphire or crystal having high thermal conductivity as the substrate (transparent plate) used in the output organic polarizing plate.

  In this case, the cooling efficiency depends on the number and interval of the outgoing organic polarizing plates, and in order to obtain sufficient cooling efficiency, it is necessary to increase the number of outgoing organic polarizing plates and increase the interval. Therefore, in order to suppress the deterioration of the outgoing organic polarizing plate due to heat generation, the number of parts increases and it becomes difficult to reduce the size of the liquid crystal projector. Alternatively, in the case of downsizing, it is necessary to increase the cooling efficiency by increasing the number of rotations of the cooling fan, which increases power consumption and noise.

  On the other hand, in addition to organic polarizing plates, for example, there are inorganic polarizing plates (reflection-type inorganic polarizing plates) in which a wire grid structure is provided on white glass and inorganic polarizing plates (absorption-type inorganic polarizing plates) using the optical properties of glass. To do. Although these are expensive compared with the organic polarizing plate, their heat resistance is sufficiently high, and when this is used, the number of sheets used can be reduced. Here, in order to prevent an adverse effect due to the reflected light from the inorganic polarizing plate, an absorption-type inorganic polarizing plate is preferably used rather than the reflective inorganic polarizing plate particularly on the emission side. Although the absorption-type inorganic polarizing plate is not deteriorated due to high temperature, since it absorbs light, it still has the same high temperature as the organic polarizing plate. When the temperature of the inorganic polarizing plate rises, the temperature of the adjacent liquid crystal panel rises due to radiation from here. When the temperature of the liquid crystal panel rises, the liquid crystal is adversely affected by heat, and the image is also deteriorated.

  In a liquid crystal projector, besides a polarizing plate, an optical compensator that controls the phase of light is often used at the same time in order to improve contrast. In this case, it is necessary to optimize the above configuration including the optical compensation plate. In general, an optical compensation plate has a configuration in which an optical compensation layer is formed on a transparent glass plate.

  A technique that uses an optical compensator at the same time as a polarizing plate and solves the above-described heat problem is described in, for example, Patent Document 1. In this technique, a polarizing plate (a layer having a polarization function) and an optical compensation layer are laminated and integrated on a transparent substrate having high heat dissipation. By cooling this structure with air, the cooling efficiency of these structures can be increased, and the adverse effect of the heat on the liquid crystal panel can be eliminated.

In order to improve the contrast, it is also important to adjust the installation angle of the polarizing plate strictly and optimize the polarization direction of the light emitted therefrom. For this reason, Patent Document 2 describes a liquid crystal projector having a configuration in which a small adjustment mechanism is provided on a fixing member for fixing each polarizing plate.
JP 2005-107363 A JP 2007-47338 A

  However, in the technique described in Patent Document 1, since the optical compensation layer is generally composed of an organic material similar to the organic polarizing plate, its own heat resistance is not high. The optical compensation layer is bonded to a transparent substrate with a transparent adhesive layer, but the adhesive layer is also made of an organic material, so its heat resistance is not high. In particular, even when no deterioration occurs in the liquid crystal panel, the temperature increase of the inorganic polarizing plate may be close to 200 ° C. In this case, the optical compensation layer may deteriorate, and the image may also deteriorate. In the technique described in Patent Document 2, the above heat countermeasure is not performed at all, and the heat resistance problem of the fixing member itself and the influence of heat on the adjacent optical compensator and the liquid crystal panel are inevitable. .

  That is, it has been difficult to obtain a liquid crystal display device capable of reducing the influence of heat and stably obtaining a high-quality image.

  The present invention has been made in view of such problems, and an object thereof is to provide an invention that solves the above problems.

In order to solve the above problems, the present invention has the following configurations.
The liquid crystal display device of the present invention is a liquid crystal display device in which an inorganic polarizing plate and an optical compensation plate are installed on the liquid crystal panel and the light incident side and / or the light emitting side. A fixed plate made of metal, having an opening in the surface, fixing the inorganic polarizing plate on one surface, and fixing the optical compensator in a point contact state on the other surface side with a spacing from the inorganic polarizing plate It is characterized by comprising.
In the liquid crystal display device of the present invention, the optical compensation plate is fixed to the fixed plate at four apexes of the rectangular optical compensation plate.
In the liquid crystal display device of the present invention, light of a plurality of colors is used, and a plurality of the inorganic polarizing plates, the optical compensation plate, and the fixed plate are used corresponding to the light of the plurality of colors. .
The liquid crystal display device of the present invention includes a dichroic prism that combines the plurality of lights, and the plurality of fixing plates are fixed to the dichroic prism.
In the liquid crystal display device of the present invention, the fixing plate is configured to be rotatable around the optical axis of the light of each color.
In the liquid crystal display device of the present invention, an absorption inorganic polarizing plate is used as the inorganic polarizing plate.
In the liquid crystal display device of the present invention, the liquid crystal display device includes a cooling fan that generates cooling air that passes between the inorganic polarizing plate and the optical compensator and between the optical compensator and the liquid crystal panel. To do.
The liquid crystal display device of the present invention is a liquid crystal projector.

  Since the present invention is configured as described above, it is possible to obtain a liquid crystal display device capable of reducing the influence of heat and obtaining a high quality image.

  Hereinafter, a liquid crystal display device which is the best mode for carrying out the present invention will be described. This liquid crystal display device is a liquid crystal projector, and projects output light generated using a liquid crystal panel in an enlarged manner. An external view of the structure of the liquid crystal projector 1 is shown in FIG.

  In the liquid crystal projector 1, an optical unit 10 that generates output light for forming an image is used, and a lamp unit 60 using a mercury lamp or the like is used as the light source. Since this lamp unit 60 is a compact and high-intensity light source, its calorific value is large. In addition, since the light used for the image signal has high luminance, the amount of heat generated by the optical element in the optical unit 10 absorbing the light is large. Therefore, an LCD cooling unit 70 and a lamp / PBS cooling fan 80 are provided to cool them. These cool the particularly large portions of the lamp and the optical unit 10 with the cooling air generated by the fan. The output light is enlarged and projected through the projection lens unit 90 to generate an image.

  FIG. 2 is a configuration diagram in the vicinity of the optical unit 10. In this optical unit 10, white light emitted from the lamp unit 60 enters a polarization beam splitter (PBS) 14 via a lamp condenser lens 11 and fly-eye lenses 12 and 13. Thereafter, the light passes through the condenser lens 15 and is separated into light of three primary colors of red, green, and blue by the dichroic mirrors 16 to 20, and the condenser lenses 21 to 25 are used for the liquid crystal panel (Blue) 26 and the liquid crystal panel (Green) 27, respectively. The light is condensed on the liquid crystal panel (Red) 28. As a result, light is modulated and output for each of these three colors.

  The incident inorganic polarizing plates 29 to 31 are installed on the incident side of each liquid crystal panel, and the outgoing inorganic polarizing plates 32 to 34 are installed on the outgoing side. A wavelength plate and a cover glass are arranged on the incident side of the blue and red incident inorganic polarizing plates 29 and 31 on the inorganic polarizing portion, and light of the polarization component rotated in the horizontal direction by the wave plate is selectively transmitted by the polarizing plate. Make it transparent. Corresponding to this, the outgoing inorganic polarizing plates 32 and 34 selectively transmit the light of the polarization component in the vertical direction. Green's incident inorganic polarizing plate 30 selectively transmits light having a polarization component in the vertical direction, and the output inorganic polarizing plate 33 selectively transmits light having a polarization component in the horizontal direction correspondingly. With this configuration, light according to the polarization of each color enters each liquid crystal panel, and the polarization direction of these lights is modulated for each pixel of each liquid crystal panel according to the image signal for each color. After these lights exit the respective outgoing inorganic polarizing plates, the light intensity is modulated according to the polarization direction, and an optical signal for each color is output. This output light is synthesized by the dichroic prism 35, is enlarged and projected through the projection lens unit 90, and forms a color image. In addition, the incident inorganic polarizing plates 29 to 31 and the outgoing inorganic polarizing plates 32 to 34 in the liquid crystal projector 1 are inorganic polarizing plates, between each incident inorganic polarizing plate and the liquid crystal panel, and each liquid crystal panel and outgoing. Incident optical compensators 41, 43, and 45 and outgoing optical compensators 42, 44, and 46 are provided at intervals between the inorganic polarizing plates. These optical compensators are provided on the incident side and the emission side, and improve the contrast of the image by adjusting the phase of light and the like. As the outgoing inorganic polarizing plate, an absorption type inorganic polarizing plate is particularly preferably used among the inorganic polarizing plates in order to eliminate the influence of the light reflected thereby returning to the liquid crystal panel side.

  In the liquid crystal projector 1, as shown in FIG. 3, the projection lens unit 90 and the optical unit 10 can be removed integrally. 3 shows an exploded view of the optical unit 10 in particular. Here, description of components on the incident side in the vicinity of each liquid crystal panel is omitted.

  In the optical unit 10, as described above, the positional relationship with the liquid crystal panel, the outgoing inorganic polarizing plate, and the outgoing optical compensation plate is important. Here, as shown in FIG. 3, each liquid crystal panel is fixed to the LCD mounting plates 47 to 49 using four screws. At the upper and lower portions of the dichroic prism 35, a plate-like prism plate (not shown) is fixedly fixed to the dichroic prism 35 with an adhesive, and the LCD fixing angle 50 is fixed to each prism plate with screws. . Further, for each color, the outgoing inorganic polarizing plates 32 to 34 and the outgoing optical compensation plates 42, 44, and 46 are fixed to the polarizing plate fixing plates 51 to 53, respectively, and each polarizing plate fixing plate is an LCD fixing angle 50 at the upper part of the prism. Screwed in. The holes of the LCD mounting plates 47 to 49 are inserted into the protrusions extending from the upper and lower LCD fixing angles 50, and each LCD mounting plate is positioned by the adjuster, and then the holes are filled in advance. The placed ultraviolet curable adhesive is cured and fixed by an ultraviolet irradiation machine.

  FIG. 4 is a top view of this structure after assembly as viewed from above in FIG. For each color, the liquid crystal panels 26 to 28, the outgoing optical compensation plates 42, 44, and 46, and the outgoing inorganic polarizing plates 32 to 34 are arranged at intervals. Therefore, cooling air generated by a cooling fan (not shown) can be allowed to pass between them to be cooled.

  Here, an outgoing inorganic polarizing plate (inorganic polarizing plate) and an outgoing optical compensation plate (optical compensation plate) are fixed to a polarizing plate fixing plate (fixed plate) for each color. Details of this configuration will be described below. Here, the configuration near the liquid crystal panel 26 will be described, but the same applies to other colors. Here, an opening 511 through which light passes is provided at the center of the polarizing plate fixing plate 51, and the outgoing inorganic polarizing plate 32 is fixed to one surface of the polarizing plate fixing plate 51. On the other hand, the outgoing optical compensation plate 42 is fixed to the polarizing plate fixing plate 51 in a point contact state with a gap from the outgoing inorganic polarizing plate 32 on the other surface side.

  FIG. 5A is a diagram showing a form when the outgoing inorganic polarizing plate (inorganic polarizing plate) 32 is fixed to the polarizing plate fixing plate (fixing plate) 51. The polarizing plate fixing plate 51 is formed into a form shown in FIG. 5A by subjecting a metal plate to sheet metal processing. Two polarizing plate fixing claws 512 and 513 are provided above the opening 511, and polarizing plate fixing springs 514 and 515 are provided below the opening 511. If the outgoing inorganic polarizing plate 32 is pressed against the A surface (one surface) 516 while being locked to the polarizing plate fixing claws 512 and 513, the lower side of the outgoing inorganic polarizing plate 32 in the figure is the polarizing plate fixing spring. It is fixed between 514 and 515 and the A surface 516, and the upper side is always pressed against the polarizing plate fixing claws 512 and 513. Therefore, the outgoing inorganic polarizing plate 32 is fixed in close contact with the periphery of the opening 511 on the A plane 516 side of the polarizing plate fixing plate 51, and the configuration shown in FIG.

  On the other hand, FIG. 6A shows a form when the output optical compensation plate (optical compensation plate) 42 is fixed to the polarizing plate fixing plate (fixing plate) 51. The four vertex portions of the rectangular output optical compensation plate 42 are fixed to the B surface (the other surface) 517 side of the polarizing plate fixing plate 51 opposite to the A surface 516. On the B surface 517 side, optical compensator fixing projections 518 and 519 provided with grooves for engaging the two top portions of the output optical compensator 42 are provided below the opening 511. . Optical compensation plate fixing springs 520 and 521 each provided with a groove for engaging the bottom two top portions of the output optical compensation plate 42 are provided above the opening 511. When the four top portions of the output optical compensation plate 42 are engaged with these grooves, the output optical compensation plate 42 is fixed to the B surface 517 side of the polarizing plate fixing plate 51. Therefore, the outgoing inorganic polarizing plate 32 and the outgoing optical compensation plate 42 can be fixed to both surfaces of the polarizing plate fixing plate 51, respectively. However, in this embodiment, the contact area between the output optical compensation plate 42 and the polarizing plate fixing plate 51 is only four grooves in contact with the four tops of the output optical compensation plate 42. It is small enough to be ignored with respect to the area of the plate 42 and can be regarded as a point contact state.

  At this time, the outgoing inorganic polarizing plate 32 and the outgoing optical compensation plate 42 are not in direct contact with each other, and the distance between them is determined by the groove configuration in the optical compensation plate fixing protrusions 518 and 519 and the optical compensation plate fixing springs 520 and 521. Determined. That is, the distance between the outgoing inorganic polarizing plate 32 and the outgoing optical compensation plate 42 is determined by the design of this groove (polarizing plate fixing plate 51).

  Further, in this configuration, in particular, there are four contact points between the output optical compensation plate 42 and the polarizing plate fixing plate 51 at the top (C) of the output optical compensation plate 42 in FIG. At any location, the contact area is small and is in a point contact state. When an absorption-type inorganic polarizing plate is used as the outgoing inorganic polarizing plate 32, light other than the polarized component in the direction of transmitting the light is absorbed, and heat generation due to this light absorption increases. The polarizing plate fixing plate 51 is made of metal, and the heat conductivity of the metal is high. Therefore, the heat of the outgoing inorganic polarizing plate 32 is conducted to the outgoing optical compensation plate 42. This thermal conduction reduces the contact area. It is suppressed by doing. For example, when a lamp unit 60 having a luminous flux of about 4000 lm is used and the size of the liquid crystal panel 26 is 0.8 inch, the temperature of the outgoing inorganic polarizing plate 32 may increase by nearly 200 ° C. Even in this case, if the heat conduction is suppressed with respect to the outgoing optical compensation plate 42 having low heat resistance, and cooling air flows between them, the temperature rise of the outgoing inorganic polarizing plate 32 can be suppressed. it can.

  According to this configuration, the polarizing plate fixing plate 51 can be made of a metal that has high heat resistance and can be processed inexpensively.

  Further, since the polarizing plate fixing plate 51 and the LCD mounting plate 47 to which the liquid crystal panel 26 is fixed are separate bodies, this heat conduction to the liquid crystal panel 26 is also suppressed. Furthermore, since the heat radiation from the outgoing inorganic polarizing plate 32 that has reached a high temperature is absorbed by the outgoing optical compensation plate 42, the influence of heat generated by the outgoing inorganic polarizing plate 32 on the liquid crystal panel 26 is suppressed. That is, it is possible to reduce the influence of heat and obtain a stable and high-quality image.

  Further, the polarizing plate fixing plate 51 is fixed to the LCD fixing angle 50 by screws at a fixing portion 522 provided above. FIG. 7A shows the configuration at this time from the incident side (B surface 517, emission optical compensation plate 42 side). Fixing holes 523 and 524 are provided in the fixing portion 522. The fixing holes 523 and 524 have a shape elongated in the circumferential direction around the optical axis 525, and the screws 526 and 527 pass through the fixing holes 523 and 524. The screws 526 and 527 are fixed to screw holes provided in the LCD fixing angle 50 fixed to the upper part of the dichroic prism 35.

  In this configuration, since the fixing holes 523 and 524 have the above-described shape, the fixing holes 523 and 524 can be rotated around the optical axis 525 as shown in FIG. Therefore, even if there is variation in the polarization direction selected particularly in the outgoing inorganic polarizing plate 32, it is possible to easily finely adjust this and adjust the contrast and the like. In particular, as described above, this configuration can be provided for each color (Blue, Green, Red). In this case, each polarizing plate fixing plate is fixed to the dichroic prism 35 via the LCD fixing angle 50. The screws 526, 527 and the like can be easily attached and detached, and this adjustment can be easily made for each color. Thereby, for example, a good black screen can be easily obtained.

  Further, even if dust or the like adheres to the outgoing inorganic polarizing plate 32 and the outgoing optical compensation plate 42 and the output is adversely affected, the screws 526 and 527 can be removed to remove the polarizing plate fixing plate 51 together. It can be easily performed, and these can be easily removed and cleaned and replaced.

  In addition, a special coating having a polarizing action may be applied on the light incident side of the outgoing inorganic polarizing plate 32, and this coating layer is mechanically weak, and therefore easily damaged. However, with the above-described configuration, the surface on which the antireflective coating is applied on the polarizing plate fixing plate 51 faces the outgoing optical compensation plate 42 side. , Scratches are less likely to be attached.

  In this configuration, since one emission inorganic polarizing plate and one emission optical compensation plate can be provided for each color, the optical unit 10 provided with these can be miniaturized. Specifically, the width W ′ in FIG. 4 can be made smaller than the width W in FIG. 8 in which a plurality of outgoing organic polarizing plates are used.

  Further, in the configuration of FIG. 8 in which two or more outgoing organic polarizing plates are used, as described above, the countermeasure against heat generation is important. For this reason, when sapphire or the like having high thermal conductivity is used as the substrate of the outgoing organic polarizing plate, it is difficult to obtain good flatness. Further, in the configuration of FIG. 8, since a plurality of these are used in combination, aberrations of the optical system (particularly, differences in image sizes of the respective colors) may occur. On the other hand, in the configuration of the above-described embodiment, it is not necessary to use sapphire for the substrate of the outgoing inorganic polarizing plate, and since this can be made one by one, such aberration does not occur. Therefore, a high-quality image can be obtained from a viewpoint other than the influence of the heat generation of the polarizing plate.

  In the above example, the configuration on the exit side of the liquid crystal panel is shown, but this configuration can also be provided on the entrance side if there is an influence of the heat generation of the polarizing plate on the entrance side. That is, the incident inorganic polarizing plate and the incident optical compensation plate can be fixed using a polarizing plate fixing plate having a similar structure.

  Conversely, if the heat generation on the incident side is sufficiently small, a single inexpensive organic polarizing plate may be used as the polarizing plate on the incident side. If the influence of the reflected light can be removed, a reflective inorganic polarizing plate can be used as the outgoing inorganic polarizing plate instead of the absorbing inorganic polarizing plate. In the case of reducing the influence of this heat on the compensation plate, the configuration according to the above-described embodiment can be similarly applied.

  In addition, this invention is not restricted to said form, For example, the direction of the polarization selected in a polarizing plate, the structure of a polarizing plate, the direction of a cooling wind, etc. are arbitrary within the range of said effect | action. The polarizing plate fixing plate is fixed to the dichroic prism in the above embodiment, but is not limited thereto.

  In the above embodiment, the cooling fan is used. However, in the environment where the liquid crystal display device is installed, sufficient cooling efficiency can be obtained without forcibly introducing the cooling air by the cooling fan. A cooling fan is unnecessary. In this case, it is possible to reduce the noise and power consumption of the liquid crystal display device.

  In the above example, the above-described configuration is provided for each color of RGB. However, it can be provided only for an optical system for a specific color that generates particularly large heat. In addition, a liquid crystal display device using a liquid crystal panel, an inorganic polarizing plate, and an optical compensation plate can be applied to other than a liquid crystal projector.

1 is an external view of a liquid crystal projector according to an embodiment of the present invention. It is a block diagram of the vicinity of an optical unit of a liquid crystal projector according to an embodiment of the present invention. FIG. 2 is a configuration and exploded view of the vicinity of an optical unit in a liquid crystal projector according to an embodiment of the present invention. FIG. 2 is a top view of a configuration near an optical unit in a liquid crystal projector according to an embodiment of the present invention. It is a figure which shows the form at the time of attaching an output inorganic polarizing plate to the polarizing plate fixing plate in the liquid crystal projector used as embodiment of this invention. It is a figure which shows the form at the time of attaching an output optical compensator to the polarizing plate fixing plate in the liquid crystal projector which becomes embodiment of this invention. It is a figure which shows the form which looked at the form at the time of the polarizing plate fixing plate in the liquid crystal projector used as embodiment of this invention being attached from the incident side. It is a top view of the structure near the optical unit in an example of a conventional liquid crystal projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal projector 10 Optical unit 11 Condenser lenses 12 and 13 for lamps Fly eye lens 14 Polarization beam splitter (PBS)
15, 21-25 Condenser lens 16-20 Dichroic mirror 26, 111 Liquid crystal panel (Blue)
27, 112 Liquid crystal panel (Green)
28, 113 LCD panel (Red)
29-31 Incident inorganic polarizing plate 32-34 Outgoing inorganic polarizing plate 35, 123 Dichroic prisms 41, 43, 45 Incident optical compensation plates 42, 44, 46 Outgoing optical compensation plates 47-49, 125-127 LCD mounting plate 50 LCD fixing Angles 51-53 Polarizing plate fixing plate 60 Lamp unit 70 LCD cooling unit 80 Lamp / PBS cooling fan 90, 124 Projection lens unit 114-122 Output organic polarizing plate 128-130 Polarizing plate fixing portion 511 Opening portion 512, 513 Polarizing plate fixing Claws 514, 515 Polarizing plate fixing spring 516 A surface 517 B surface 518, 519 Optical compensation plate fixing projection 520, 521 Optical compensation plate fixing spring 522 Fixing portion 523, 524 Fixing hole 525 Optical axis 526, 527 Screw

Claims (8)

A liquid crystal panel, and a liquid crystal display device in which an inorganic polarizing plate and an optical compensator are installed on a light incident side and / or a light emitting side of the liquid crystal panel,
Metal fixing that has an opening in the center, fixes the inorganic polarizing plate on one surface, and provides a space between the inorganic polarizing plate and fixes the optical compensator in a point contact state on the other surface side A liquid crystal display device comprising a plate.   The liquid crystal display device according to claim 1, wherein the optical compensation plate is fixed to the fixing plate at four tops of the rectangular optical compensation plate.   2. The liquid crystal display device according to claim 1, wherein a plurality of colors of light are used, and a plurality of the inorganic polarizing plates, the optical compensation plate, and the fixed plate are used corresponding to the plurality of colors of light. 3. A liquid crystal display device according to 1 or 2.   The liquid crystal display device according to claim 3, further comprising a dichroic prism that synthesizes the plurality of lights, wherein the plurality of fixing plates are fixed to the dichroic prism.   The liquid crystal display device according to claim 4, wherein the fixing plate is configured to be rotatable around an optical axis of the light of each color.   The liquid crystal display device according to any one of claims 1 to 5, wherein an absorption-type inorganic polarizing plate is used as the inorganic polarizing plate.   7. A cooling fan that generates cooling air that passes between the inorganic polarizing plate and the optical compensator and between the optical compensator and the liquid crystal panel is provided. The liquid crystal display device according to any one of the above.   The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal projector.

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