JP2006195267A - Projection display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniformize internal pressure of respective triangular prisms for R light, G light and B light provided at respective reflection type liquid crystal panel assembly for R light, G light and B light. <P>SOLUTION: In a projection type display apparatus, when a wire grid polarizer 32 having excellent polarized light separation characteristic toward image light of each color emitted from a reflection type liquid crystal panel 33 for each color light corresponding to R light, G light and B light is used for each color light, the wire grid polarizer 32, the reflection type liquid crystal panel 33 and a transmission type polarizing plate 36 are attached to the triangular prism 31 for each color light, the inside of the triangular prism 31 for each color light, the internal pressure of the triangular prism 31 for each color light is tightly closed and then is uniformized by a duct means 45. Thereby pixel deviation occurring in forming the image of color composition image light does not occur and each deformation amount of the wire grid polarizer 32 for each color light can be suppressed as much as possible. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, a wire grid polarizer serving as a polarization separation unit and a reflective spatial light modulator (reflection) serving as an image forming unit are provided in each triangular prism for each color light prepared corresponding to R light, G light, and B light. Type liquid crystal panel) and a polarizing plate or transparent glass plate that serves as a means for separating unnecessary light, and a triangular prism for each color light is synthesized in three colors with the inside of the triangular prism for each color light sealed with uniform pressure. The present invention relates to a projection display device configured to face each incident surface of a dichroic prism.

  A projection display device for enlarging and projecting a color image has various structural forms depending on the arrangement relationship of optical components, but for a spatial light modulator using a liquid crystal panel (hereinafter referred to as a liquid crystal panel). There are a transmission type that transmits light and a reflection type that reflects light. In either case, white light emitted from a light source is converted into R light (red light), G light (green light), The three primary color lights are separated into B light (blue light), and the three primary color lights are guided to the corresponding liquid crystal panels for R, G, B light, respectively, and further, each liquid crystal for R, G, B light is used. It is obtained by the color synthesis optical system by color-synthesizing each image light of R light, G light, and B light modulated by the panel according to each image signal of R, G, B light by the color synthesis optical system. The color composite image light is enlarged and projected from the projection lens onto the screen.

At this time, in this type of projection display device, in the case of the transmission type, it is difficult to increase the resolution of the projected image. Therefore, when a reflective liquid crystal panel is used to achieve high resolution, a space including a portion from an optical element that causes light to enter each reflective liquid crystal panel for R, G, and B light to a projection lens. There has been proposed a projection type display device in which a cover is sealed with a transparent cover (for example, Patent Document 1).
JP2003-202538A.

  FIG. 17 is a block diagram showing a conventional projection display apparatus.

  The conventional projection display device 100 shown in FIG. 17 is disclosed in the above-described Patent Document 1 (Japanese Patent Laid-Open No. 2003-202538), and is briefly described here with reference to Patent Document 1. To do.

  As shown in FIG. 17, in the projection type display device 100 of the conventional example, the light emitted from the light source 102 provided in the housing 101 is reflected by the reflector 103 and converted into parallel light, and after passing through the condenser lens 104. The first dichroic mirror 105 reflects the B light (blue light) and transmits the R light (red light) and the G light (green light).

  Here, the B light reflected by the first dichroic mirror 105 changes its optical path by 90 °, passes through a cover glass 108 to be described later, and is input to the polarizing beam splitter 110B for B light. The light is reflected by the polarization separation surface 110B and is input to the reflective liquid crystal panel 111B for B light.

  The R light and G light transmitted through the first dichroic mirror 105 are reflected by the reflecting mirror 106, change the optical path by 90 °, and reflect the G light and enter the second dichroic mirror 107 that transmits the R light. To do. The G light is reflected by the second dichroic mirror 107, changes its optical path by 90 ° and passes through the cover glass 108, and then passes through the polarization separation surface of the G light polarization beam splitter 110G as it is. While being input to the reflective liquid crystal panel 111G, the R light passes through the second dichroic mirror 107 and the cover glass 108 in order, and then is reflected by the polarization separation surface of the R beam polarizing beam splitter 110R to reflect the R light. Input to the liquid crystal panel 111R.

  In each of the reflection type liquid crystal panels 111R, 111G, and 111B for R, G, and B light, R light that is light-modulated according to each image signal of R, G, and B light input through each wire 112, respectively. , G light, and B light are incident on a dichroic prism 113 for three-color synthesis via respective polarization beam splitters 110R, 110G, and 110B for R, G, and B light. After the color synthesis of the image light, the color synthesized image light is emitted to the projection lens 114 side.

  At this time, in the conventional projection display device 100, the polarization beam splitters 110R, 110G, and 110B for R, G, and B light, and the reflective liquid crystal panels 111R, 111G, and 111B for R, G, and B light, The dichroic prism 113 and a part of the projection lens 114 are positioned and mounted on the chassis 115 fixed to the housing 101, and the polarization beam splitters 110R and 110G for R, G, and B light. , 110B, the reflective liquid crystal panels 111R, 111G, 111B for R, G, B light, the dichroic prism 113, and a part of the projection lens 114 are sealed with a transparent cover glass 108. Since dust and dust are prevented from entering the space, a screen (not shown) is provided via the projection lens 114. Effect that can prevent degradation of image quality due to color shift of the color composite image beam Isa is disclosed.

  By the way, according to the above-described conventional projection display device 100, the polarization beam splitters 110R, 110G, and 110B for R, G, and B light and the reflective liquid crystal panels 111R for R, G, and B light, respectively. The space including 111G and 111B, the dichroic prism 113, and a part of the projection lens 114 is sealed with a transparent cover glass 108 so as to prevent dust and dust from entering. It is obvious that the projection-type display device 100 of the conventional example is increased in size with the increase in the inner space.

  Further, the R, G, and B light incident on the polarization beam splitters 110R, 110G, and 110B for R, G, and B light and the reflective liquid crystal panels 111R, 111G, and 111B for R, G, and B light, respectively. Since the polarization components are separated from each of the R-, G-, and B-light image light light-modulated by the cubic polarization beam splitters 110R, 110G, and 110B, the polarization separation means is also increased in size. So it is a problem.

  Therefore, a wire grid polarizer having good polarization separation characteristics for each color image light emitted from the reflective spatial light modulator for each color light corresponding to R light, G light, and B light is used for each color light. At the same time, a wire grid polarizer, a reflective spatial light modulator, and a polarizing plate or a transparent glass plate are attached to the triangular prism for each color light, and the inside of the triangular prism for each color light is sealed, and then for each color light. By equalizing the internal pressure of the triangular prism by the duct means, there is no pixel shift that occurs during the formation of the color composite image light, and each deformation amount of the wire grid polarizer for each color light is suppressed as much as possible. In addition, there is a demand for a projection display device that can be miniaturized.

This invention is made | formed in view of the said subject, The invention of Claim 1 is a light source,
A color separation optical system that separates the light emitted from the light source into R, G, and B color lights;
The R light, the G light, and the B light are respectively transmitted in one direction, and the transmitted R light, the G light, and the B light are reflected on each color light by a reflective spatial light modulator for each color light. A wire grid polarizer for each color light that reflects a polarized light component in the other direction different from the polarized light component in the one direction obtained by performing light modulation according to the image signal of each color as image light of each color;
Polarizing plate for each color light that is emitted by removing unnecessary polarization components from the image light of each color reflected from the reflective spatial light modulation element for each color light reflected by the wire grid polarizer for each color light When,
A color synthesizing optical system that synthesizes the image light of each color emitted from the polarizing plate for each color light and emits it as color synthesized image light; and
A projection display device including a projection lens for projecting the color composite image light,
A first surface formed at an angle of 45 ° with respect to the optical path of each color light from the color separation optical system in order to attach the wire grid polarizer for each color light; and the reflective spatial light modulation element for each color light And a second surface formed orthogonal to the optical path of each color light from the color separation optical system, and the optical path of each color light from the color separation optical system to attach the polarizing plate for each color light. A triangular surface for each color light having a third surface formed in parallel to each other, a lower surface and an upper surface, and the interior surrounded by a triangular prism shape on each surface is sealed,
A projection type display device comprising: duct means for equalizing the internal pressure of the triangular prisms for each color light.

  According to the projection type display device of claim 1, in the projection type display device to which three reflective spatial light modulation elements (reflective liquid crystal panels) are applied corresponding to R light, G light and B light, When a wire grid polarizer having good polarization separation characteristics for each color image light emitted from the reflective spatial light modulator for each color light corresponding to R light, G light, and B light is used for each color light A wire grid polarizer, a reflective spatial light modulator, and a transmissive polarizing plate are attached to the triangular prisms for each color light, and the inside of the triangular prism for each color light is sealed, and the internal pressure of the triangular prism for each color light is applied. Since the uniformization is performed by the duct means, the deformation amounts of the R, G, B light wire grid polarizers bonded to the R, G, B light triangular prisms are the same, so that the color composite image light is coupled. The pixel shift that occurs at the time of image is not caused. Each deformation amount of the wire grid polarizer for the respective color lights even with can be minimized, high brightness, the high contrast can be attained, which contributes to the quality and reliability of the projection type display device. At this time, since the triangular prisms for the respective color lights are formed in a small size, the projection display device can be miniaturized.

  Hereinafter, an embodiment of a projection type display apparatus according to the present invention will be described in detail in the order of Embodiment 1 to Embodiment 4 with reference to FIGS.

FIG. 1 is a plan view showing the overall configuration of a projection display apparatus according to Embodiment 1 of the present invention,
FIG. 2 is a perspective view of a reflection type liquid crystal panel assembly for R, G, and B light, a three-color composite cross dichroic prism, and a projection lens, as viewed from above, in the projection display device according to Embodiment 1 of the present invention;
FIGS. 3A to 3C are diagrams for explaining a wire grid polarizer in the reflective liquid crystal panel assembly in the projection display apparatus according to the first embodiment of the present invention.

  As shown in FIG. 1, the projection display device 10A according to the first embodiment of the present invention is a reflective type that reflects light as a spatial light modulation element corresponding to each of R light, G light, and B light, as will be described later. It is configured using.

  In the projection display device 10A of the first embodiment, a light source 11 that emits non-polarized white light, and white light from the light source 11 is converted into R light (red light), G light (green light), and B light (blue light). ), Color separation optical systems 17 to 19 for color separation, R, G, B light reflection type spatial light modulators (hereinafter referred to as reflection type liquid crystal panels) 33, and R, G, B light use. A three-color composite cross dichroic prism 40 that synthesizes the image light of each color light-modulated by each reflective liquid crystal panel 33, and a projection lens that projects the color composite image light obtained by the three-color composite cross dichroic prism 40 42 are arranged on the same plane.

  First, the light source 11 emits non-polarized white light including R light, G light, and B light using a metal halide lamp, a xenon lamp, a halogen lamp, etc., and the white light emitted from the light source 11 is a concave spherical surface. A first fly-eye lens array 13 which is substantially parallel light and is attached to the front surface of the concave spherical reflector 12 by being reflected by the reflecting mirror 12, and provided in front of the first fly-eye lens array 13. The light enters the second fly-eye lens array 14 in order. These first and second fly-eye lens arrays 13 and 14 form a pair to form an integrator for uniformizing the illuminance distribution in the white light beam. Note that a visible light removal filter (not shown) that cuts ultraviolet light and infrared light may be disposed in front of the light source 11.

  Thereafter, the non-polarized white light whose illuminance distribution is made uniform by the first and second fly-eye lens arrays 13 and 14 is incident on the polarization conversion prism array 15 serving as a polarization conversion optical element. The polarization conversion prism array 15 includes a polarization separation prism array and a λ / 2 phase difference plate, and is configured in a flat plate shape as a whole. That is, the light incident on the polarization conversion prism array 15 is first separated into a P-polarized component and an S-polarized component with respect to the polarization beam splitter film surface by the polarization beam splitter film surface of the polarization separation prism array. At this time, a plurality of polarization beam splitter film surfaces of the polarization conversion prism array 15 are provided in parallel stripes, and each has an inclination of 45 ° with respect to the main surface of the polarization conversion prism array 15. On the polarization beam splitter film surface, the P-polarized component is transmitted and emitted to the back side of the polarization conversion prism array 15, and the S-polarized component is reflected. The S-polarized component reflected by one polarization beam splitter film surface is bent by 90 ° in the optical path, is reflected again by another adjacent polarization beam splitter film surface, and is bent by 90 °, and the polarization conversion prism array 15 The light is emitted to the back side. A λ / 2 phase difference plate is provided in a region where such an S-polarized component is emitted. The S-polarized component transmitted through the λ / 2 retardation plate is rotated by 90 ° in the polarization direction, and the P-polarized component transmitted through the polarizing beam splitter film surface (or the S-polarized light reflected twice on the polarizing beam splitter film surface). The polarization direction is the same as that of the component. In this way, the non-polarized white light from the light source 11 passes through the polarization conversion prism array 15 and then becomes polarized light in a predetermined direction.

  In the form of the first embodiment, the light transmitted through the polarization conversion prism array 15 is converted into, for example, P-polarized light as polarized light in one predetermined direction, as indicated by reference numerals in FIG. However, the polarization conversion efficiency in the polarization conversion prism array 15 is not 100%, and the emitted light from the polarization conversion prism array 15 is mixed with several to several tens of s-polarized light components.

  In the following description, polarized light in one predetermined direction obtained by the polarization conversion prism array 15 is described as P-polarized light. However, the present invention is not limited to this, and white light from the light source 11 is converted by the light conversion prism array 15. A method of converting the polarization into S-polarized light is also possible.

  Thereafter, the white light of the P-polarized light transmitted through the polarization conversion prism array 15 is incident on the first dichroic mirror 17 via the field lens 16. The first dichroic mirror 17 reflects the two color components of R light and G light from white light including R light, G light, and B light, changes the direction by 90 °, and transmits the remaining B light. And go straight ahead. Then, the R light and G light reflected by the first dichroic mirror 17 are incident on the first metal film reflecting mirror 18 and reflected by the first metal film reflecting mirror 18 to change the direction by 90 °. Later, the light enters the second dichroic mirror 19. The second dichroic mirror 19 transmits the R light and travels straight as it is to make the R light incident on the R-light reflective liquid crystal panel assembly 30R, while reflecting the G light and changing the direction by 90 °. , G light is incident on the reflective liquid crystal panel assembly 30G for G light.

  Further, the B light transmitted through the first dichroic mirror 17 is sequentially reflected by the second and third metal film reflecting mirrors 20 and 21 and is incident on the B-light reflective liquid crystal panel assembly 30B.

  From the above, the first dichroic mirror 17, the first metal film reflecting mirror 18, and the second dichroic mirror 19 constitute a color separation optical system that separates white light from the light source 11 into R light, G light, and B light. is doing.

  Here, the reflective liquid crystal panel assembly 30R for R light, the reflective liquid crystal panel assembly 30G for G light, and the reflective liquid crystal panel assembly 30B for B light are all configured in the same manner, and the reflective material for R light is used. The liquid crystal panel assembly 30R, the G-light reflective liquid crystal panel assembly 30G, and the B-light reflective liquid crystal panel assembly 30B are components of the three-color composite cross dichroic prism 40 serving as a color composite optical system formed in a rectangular parallelepiped shape. It faces each of the incident surfaces 40a to 40c with a gap.

  At this time, the reflective liquid crystal panel assembly 30R for R light, the reflective liquid crystal panel assembly 30G for G light, the reflective liquid crystal panel assembly 30B for B light, and the three-color composite cross dichroic prism 40 are shown in FIG. As described above, it is fixed to the base table 25 using an aluminum material by an adhesive.

  Further, as shown in FIG. 2, each of the reflective liquid crystal panel assembly 30R for R light, the reflective liquid crystal panel assembly 30G for G light, and the reflective liquid crystal panel assembly 30B for B light has a hollow interior. The formed triangular prism 31 is prepared for each color light, and is polarized on the first surface 31c formed in the triangular prism 31 for each color light so as to be inclined by 45 ° with respect to the optical path of each color light from the color separation optical systems 17-19. A plate-shaped wire grid polarizer 32 serving as a separating unit is attached by being bonded with an adhesive, and is formed on a second surface 31d formed orthogonal to the optical path of each color light from the color separation optical systems 17-19. A reflective liquid crystal panel 33 is attached via an aperture mask plate 34, and unnecessary polarized light removing means is provided on a third surface 31e formed in parallel to the optical path of each color light from the color separation optical systems 17-19. Become transparent The polarizing plate 34 is attached with an adhesive and is attached, and further, the interior surrounded by the triangular prism shape by the lower surface 31a and the upper surface 31b of the triangular prism 31 and the first surface 31c to the third surface 31e is sealed against dust and the like. In this state, the transmissive polarizing plate 34 side for each color light is opposed to each incident surface 40a to 40c of the three-color composite cross dichroic prism 40 with a gap therebetween.

  At this time, by filling the triangular prism 31 for each color light with an inert gas such as nitrogen or argon, the wire grid polarizer 32, the reflective liquid crystal panel 33, and the transmissive polarizing plate 36 can be prevented from being altered.

  Further, the wire grid polarizer 32, the reflective liquid crystal panel 33, and the transmissive polarizing plate 36 attached to the triangular prisms 31 for light of each color are suspended from the base base 25.

  The reflective liquid crystal panel 33 is attached to the triangular prism 31 integrally with an adhesive in an aperture mask plate 34 that regulates the opening, and a heat sink for heat dissipation is provided on the back side of the reflective liquid crystal panel 33. 35 is attached. The reflective liquid crystal panel 33 may be directly bonded to the second surface 31d of the triangular prism 31 with an adhesive without using the aperture mask plate 34.

  For example, when R light of the P polarization component is incident on the reflective liquid crystal panel assembly 30R for R light, the R light of the P polarization component is transmitted through the wire grid polarizer 32 attached to the triangular prism 31, and R The light is incident on the reflective liquid crystal panel 33 for light.

  The above-described wire grid polarizer 32 is a kind of reflective polarizing plate. As shown in FIG. 3A, metal wires 32b such as aluminum are regularly striped on an optical glass plate 32a at a pitch of 140 nm, for example. Are arranged side by side and transmit a polarized light component perpendicular to the metal line 32b (for example, P-polarized light) as it is and reflect a polarized light component parallel to the metal line 32b (for example, S-polarized light). It has a function.

  As shown in FIG. 3B, the wavelength dependency of the transmittance of the P-polarized component is shown in FIG. 3C when the incident angle α of the incident light by the P-polarized light to the wire grid polarizer 32 is used as a parameter. ). In FIG. 3C, a is an incident angle α of incident light by P-polarized light to the wire grid polarizer 32 is 0 °, b is an incident angle α of −15 °, and c is an incident angle α of + 15 °. Shows the case. The incident angle α is an angle formed by the light incident on the wire grid polarizer 32 with respect to the optical axis, and the incident surface of the wire grid polarizer 32 is inclined by 45 ° with respect to the optical axis. In this wire grid polarizer 32, even if the incident angle α reaches ± 15 °, the wavelength dependency of the transmittance of the P-polarized light is extremely small and stable in the visible wavelength region.

  For this reason, when the wire grid polarizer 32 is used, a bright display image with good color reproducibility can be obtained. Further, the wire grid polarizer 32 is a single plate-shaped polarization separation plate, and thus is lightweight. Moreover, since the wire grid polarizer 32 is difficult to absorb the light emitted from the light source 11 (FIG. 1), it is possible to suppress deterioration in the quality of the display image due to birefringence.

  Returning to FIGS. 1 and 2 again, when the R light by the P-polarized light transmitted through the wire grid polarizer 32 for R light enters the reflective liquid crystal panel 33 for R light, the reflective liquid crystal panel 33 for R light is used. The light beam reflected after being modulated in accordance with the image signal of R light returns to the wire grid polarizer 32 for R light again. Here, the wire grid polarizer 32 for R light reflects only the light beam of S-polarized light that is light-modulated and reflected by the reflective liquid crystal panel 33 for R light.

  At this time, the reflective liquid crystal panel 33 is provided with a switching element on a silicon substrate in a matrix, and a plurality of pixel electrodes made of metal such as aluminum are provided above the switching element via an insulating layer. Liquid crystal is sealed between the common electrode provided on the transparent substrate and a voltage is applied between the plurality of pixel electrodes and the common electrode, and the image signal of each color light is incident on the incident light incident from the transparent substrate side. The reflection type is configured to emit image light obtained by modulating the light in accordance with the light and reflecting the incident light by a plurality of pixel electrodes. Such a reflective liquid crystal panel 33 is suitable for high-resolution images because of its high degree of pixel integration, and a circuit structure can be stacked below a plurality of pixel electrodes, so that the aperture ratio can be increased to about 90%. It has the advantage of being able to display bright, smooth and detailed images.

  Thereafter, the R light by the S-polarized light reflected by the wire grid polarizer 32 for the R light is disposed in the triangular prism 31 for the R light so as to face the three-color composite cross dichroic prism 40. A three-color composite cross dichroic prism that is incident on a transmissive polarizing plate 36 serving as an unnecessary polarized light removing means and removes P-polarized light (unnecessary polarized light), which is an unnecessary polarization component, by the transmissive polarizing plate 36. It is made incident from 40 incident surfaces 40a.

  At this time, the transmissive polarizing plate 36 serving as the above-described unnecessary polarized light removing means displays the P polarization light, which is unnecessary polarized light, in the reflected light reflected by the wire grid polarizer 32 as it is. This is a factor for reducing the contrast ratio of the image, and is provided for removing unnecessary P-polarized light. And as a transmissive polarizing plate 36, absorption dichroism is obtained by dyeing and adsorbing a dichroic material such as iodine or an organic dye on a base film (polyvinyl alcohol; PVA), and highly stretching and orienting it. Is expressed. A polarizing film in which this PVA polarizing layer is sandwiched between TAC (triacetyl cellulose) layers is affixed on a glass substrate with an adhesive or an adhesive. The transmissive polarizing plate 36 based on such absorption dichroism absorbs the polarization component in the same direction as the arrangement of the dichroic dyes out of the orthogonal polarization components of the incident light beam, and the other polarization component. Transparent.

  Since the transmissive polarizing plate 36 is a light absorption type, it is desirable to use a substrate having excellent thermal conductivity such as crystal or sapphire in consideration of heat resistance and heat dissipation. In order to improve the light utilization rate and to prevent deterioration of the quality of the display image due to unnecessary reflected light at the interface, it is necessary to apply a anti-reflection coating to the air interface of the transmissive polarizing plate 36. These polarization characteristics and antireflection film characteristics are preferably optimized for each of R, G, and B colors.

  Further, although the transmission type polarizing plate 36 may be composed of a single-sided film, it is difficult to flatten the surface of the film with a wavelength order. Therefore, the non-planarity of the film surface becomes wavefront aberration, and the resolution is reduced. Deteriorating factor. Therefore, in order to achieve higher resolution, the polarizing film is sandwiched between flat optically polished substrates (white plate glass, optical glass, crystal, quartz, sapphire, etc.), and adhesive or adhesive material is used. Degradation of resolution can be prevented by filling the unevenness of the film.

  Hereinafter, when the G light and the B light are incident on the reflective liquid crystal panel assembly 30G for the G light and the reflective liquid crystal panel assembly 30B for the B light, similarly to the R light described above, the G light and the B light are used. S-polarized G light and B light that have been light-modulated and reflected by the reflective liquid crystal panels 33, 33 are incident from the incident surface 40 b and the incident surface 40 c of the three-color composite cross dichroic prism 40.

  Thereafter, the R light, G light, and B light image light incident from the incident surfaces 40 a to 40 c of the three-color composite cross dichroic prism 40 are first and first formed in the three-color composite cross dichroic prism 40. Color synthesis is performed by the two dichroic films 40e and 40f, and the color composite image light obtained by the color synthesis cross dichroic prism 40 is emitted from the emission surface 40d and incident on the projection lens 42 via the quarter wavelength plate 41, The projection lens 42 enlarges and projects onto a screen (not shown) to form a real image, and displays the color composite image light.

  The above-described three-color composite cross dichroic prism 40 is formed in a rectangular parallelepiped (including a cube) using optical glass, and the first and second dichroic films 40e and 40f cross in an X shape when viewed from above. ing.

  At this time, the first dichroic film 40e in the three-color composite cross dichroic prism 40 reflects the R light incident from the incident surface 40a, changes the direction by 90 ° and emits the light from the output surface 40d, and from the incident surface 40b. The incident G light is transmitted as it is to be emitted from the exit surface 40d, and the B light incident from the entrance surface 40c is also transmitted. The second dichroic film 40f in the three-color composite cross dichroic prism 40 reflects the B light incident from the incident surface 40c, changes the direction by 90 ° and emits the light from the output surface 40d, and enters from the incident surface 40b. The G light is transmitted as it is and emitted from the exit surface 40d, and the R light incident from the entrance surface 40a is also transmitted. Accordingly, the first and second dichroic films 40e and 40f formed in the three-color composition cross dichroic prism 40 can be used for three-color composition.

  The quarter-wave plate 41 disposed between the three-color composite cross dichroic prism 40 and the projection lens 42 allows a small amount of reflected light from the lens surface of the projection lens 42 to transmit the three-color composite cross dichroic prism 40 and the transmission type. This is for returning to the reflective liquid crystal panel 33 side through the polarizing plate 36 and the wire grid polarizer 32, being reflected again and reaching the screen, and preventing unnecessary light from appearing in a ghost shape. The plate 41 may be installed as necessary.

  Here, in the above-described reflective liquid crystal panel assembly 30R for R light, reflective liquid crystal panel assembly 30G for G light, and reflective liquid crystal panel assembly 30B for B light, R and G which are the main parts of the first embodiment. The equalization of the internal pressure of each triangular prism 31 for B light will be described with reference to FIGS.

FIG. 4 shows a projection type display apparatus according to Embodiment 1 of the present invention. When the reflection type liquid crystal panel assembly for R, G, B light, the three-color composite cross dichroic prism, and the projection lens are viewed from below, The perspective view which showed the state which piped the duct in order to equalize the internal pressure of each triangular prism for G, B light,
FIG. 5 shows a projection type display apparatus according to the first embodiment of the present invention in which the internal pressures of the R, G, B light triangular prisms provided in the R, G, B light reflective liquid crystal panel assemblies are uniform. It is the perspective view which showed the state which piped the duct in order to make it.

  R light, G light, and B light were respectively incident on the above-described reflective liquid crystal panel assembly 30R for R light, reflective liquid crystal panel assembly 30G for G light, and reflective liquid crystal panel assembly 30B for B light. Occasionally, by forming the inside of the triangular prism 31 for each color light in a sealed structure, the wire grid polarizer 32 attached to the triangular prism 31 for each color light is protected from the surrounding environment such as humidity and dust.

  However, when each color light passes through the wire grid polarizer 32, the reflective liquid crystal panel 33, and the transmissive polarizing plate 36 in the triangular prism 31 for each color light, each color light color-separated into R light, G light, and B light. Each has a difference in transmittance with respect to the optical component, and generally the transmittance of B light is about 2% lower than that of R light and G light. At this time, it is known that each color light absorbed by the optical component without being transmitted is converted into heat, and the lower the transmittance, the greater the amount of heat generated. For this reason, the temperature in the triangular prism 31 for B light on which B light is incident is higher than the temperature in each triangular prism 31 for R and G light on which R light and G light are incident.

  In addition, the internal space of each triangular prism 31 for R, G, B light causes a rise in pressure along with the temperature rise, and the difference in heat generation temperature in each triangular prism 31 for R, G, B light is as follows: Since a difference occurs in the pressure increase in the internal space of each of the triangular prisms 31 for R, G, and B light, the pressure in the internal space of the triangular prism 31 for B light is changed to the inside of each triangular prism 31 for R, G light. Higher than the pressure in the space.

  Therefore, among the wire grid polarizers 32 for light of each color adhered to the triangular prisms 31 for R, G, and B light, the wire grid polarizer 32 for B light is most affected by the internal pressure. Thus, the wire grid polarizer 32 for B light is more easily deformed than the wire grid polarizers 32 for R and G light due to the internal pressure at this time. In particular, since the difference in deformation amount of each wire grid polarizer 32 for R, G, and B light has a risk of causing pixel shift at the time of image formation of color composite image light, the wire grid polarizer for each color light. The respective deformation amounts of 32 must be made the same for each color, and it is necessary to improve the optical characteristics by suppressing the deformation amounts of the wire grid polarizer 32 for each color light as small as possible.

  Therefore, as shown in FIGS. 4 and 5, in the first embodiment, each of the R, G, B lights provided in the reflection type liquid crystal panel assemblies 30R, 30G, 30B for the R, G, B lights is used. Between each bottom face 31a of the triangular prism 31 and the base base 25 (FIG. 2), a duct 45 that is branched into three as duct means is piped toward each triangular prism 31. The branch paths 45r, 45g, and 45b branched from the duct 45 communicate with each round hole 31a that is formed by penetrating through a substantially central portion of each bottom surface 31a of each triangular prism 31.

  At this time, if a space for piping cannot be secured between each bottom surface 31a of each triangular prism 31 for R, G, B light and the base table 25 (FIG. 2), the duct 45 is connected to the lower surface side of the base table 25. A relief groove (not shown) may be formed in the base table 25 along the duct 45. Further, it is possible to pipe the duct 45 not on the bottom surface 31a side of each triangular prism 31 for R, G, B light but on each upper surface side opposite to the bottom surface 31a.

  Even if the pressure in the internal space of the triangular prism 31 for B light is higher than the pressure in the internal space of each triangular prism 31 for R and G light, the three-branched duct 45 is connected to each of the R, G and B light. By connecting the triangular prism 31 from the bottom surface 31 to the internal space, the pressure in the triangular prism 31 for the B light is distributed in each triangular prism 31 for the R and G lights. The pressure inside is averaged.

  Accordingly, since the deformation amounts of the R, G, B light wire grid polarizers 32 adhered to the R, G, B light triangular prisms 31 are the same, the pixels generated when the color composite image light is imaged. Since no deviation occurs, each deformation amount of the wire grid polarizer 32 for each color light can be suppressed as small as possible, and high brightness and high contrast can be achieved. The triangular prism 31 for each color light can be reduced in size, and the projection display device 10A can be downsized.

  Next, modifications 1 and 2 in which the projection display device 10A according to the first embodiment is partially modified will be briefly described with reference to FIGS. 6 and 7 with a focus on differences from the first embodiment.

FIG. 6 shows an R, G, B light provided in each reflective liquid crystal panel assembly for R, G, B light in Modification 1 in which the projection display device of Embodiment 1 according to the present invention is partially modified. The perspective view which showed the state which piped the duct in order to equalize the internal pressure of each triangular prism for
FIG. 7 shows a second modification in which the projection display device according to the first embodiment of the present invention is partially modified, and the R, G, B light provided in each reflection type liquid crystal panel assembly for R, G, B light. It is the perspective view which showed the state which piped the duct via the gas communication box in order to equalize the internal pressure of each triangular prism for use.

  First, as shown in FIG. 6, in the first modification obtained by partially modifying the first embodiment, the R, G, and B provided in each of the reflective liquid crystal panel assemblies 30R, 30G, and 30B for R, G, and B light are used. A branch path 45r, 45g, 45b branched from the duct 45 is connected to each bottom face 31a of each triangular prism 31 for B light, and a pressure adjusting device 46 is attached in the vicinity of the junction of the branch paths 45r, 45g, 45b. Thus, the internal pressure of the triangular prism 31 for each color light can be kept constant. At this time, the pressure adjusting device 46 may be of any material or structure as long as the pressure can be adjusted by easily expanding and contracting in the space.

  Next, as shown in FIG. 7, in the second modification obtained by partially deforming the first embodiment, the R, G, and B components provided in the reflective liquid crystal panel assemblies 30R, 30G, and 30B for R, G, and B light are used. A gas communication box 47 is installed as a duct means on the bottom surface 31a side of each triangular prism 31 for B light, and ducts 48r, 48g, 48b are directed from each side surface of the gas communication box 47 to each bottom surface 31a of each triangular prism 31. As a result, the internal pressure of the triangular prism 31 for each color light can be made uniform.

FIG. 8 is a plan view showing a configuration of a projection display apparatus according to Embodiment 2 of the present invention,
FIG. 9 is a perspective view of a reflection type liquid crystal panel assembly for R, G, and B light, a three-color composite cross dichroic prism, and a projection lens as viewed from above, in the projection display device according to Embodiment 2 of the present invention;
FIG. 10 shows a projection display apparatus according to Embodiment 2 of the present invention, in which the internal pressures of the R, G, B light triangular prisms provided in the R, G, B light reflective liquid crystal panel assemblies are uniform. It is the perspective view which showed the state which connected the duct in order to make it.

  As shown in FIGS. 8 and 9, in the projection display device 10B according to the second embodiment of the present invention, the R light reflective liquid crystal panel assembly 30R ′ and the G light reflective liquid crystal panel assembly 30G ′ and B are used. Each color light that reflects unnecessary polarized light as an unnecessary polarized light removing means for each color light is replaced with the transmissive polarizing plate 36 for each color light used in Example 1 in the light reflective liquid crystal panel assembly 30B ′. Since only the point that the reflective polarizing plate 37 is used is different from the first embodiment, the difference from the first embodiment will be briefly described below.

  That is, as shown in FIG. 9, in the projection type display device 10B of the second embodiment, the R-light reflective liquid crystal panel assembly 30R ′, the G-light reflective liquid crystal panel assembly 30G ′, and the B-light reflective liquid crystal panel. Each of the panel assemblies 30B ′ prepares a triangular prism 31 having a hollow interior for each color light, and with respect to the optical path of each color light from the color separation optical systems 17 to 19 in the triangular prism 31 for each color light. A plate-like wire grid polarizer 32 serving as a polarization separating unit is attached to the first surface 31c formed with an inclination of 45 ° by an adhesive, and each color light from the color separation optical systems 17 to 19 is attached. Although the point that the reflective liquid crystal panel 33 is attached to the second surface 31d formed orthogonal to the optical path via the aperture mask plate 34 is the same as that of the first embodiment, the color separation optical systems 17 to Each color from 19 A reflective polarizing plate 37 serving as a means for removing unnecessary polarized light is attached to the third surface 31e formed in parallel with the optical path of the first embodiment by being bonded with an adhesive instead of the transmissive polarizing plate 36 of the first embodiment. The first embodiment differs from the first embodiment in that the reflective polarizing plate 37 side is opposed to each of the incident surfaces 40a to 40c of the three-color composite cross dichroic prism 40 with a gap.

  At this time, for example, a wire grid polarizer is used as the reflective polarizing plate 37 serving as a means for removing unnecessary polarized light, and the wire grid polarizer is a light absorbing transmissive polarizing plate 36 used in the first embodiment. Compared to the above, heat resistance and light resistance are superior, so that sufficient reliability can be obtained for light from the high-power light source 11.

  Therefore, in the second embodiment, the S-polarized light is reflected by the reflective polarizing plate 37 for each color light with respect to the image light of each color from the reflective liquid crystal panel 33 for each color light reflected by the wire grid polarizer 32 for each color light. Unnecessary polarized light (P-polarized light) other than light is removed and S-polarized light is emitted. Thereafter, the image light of each color transmitted through the reflective polarizing plate 37 for each color light is output by the three-color composite cross dichroic prism 40. Color composition.

  As shown in FIG. 10, in this second embodiment as well, each of the R, G, B lights provided in each of the reflection type liquid crystal panel assemblies 30R ′, 30G ′, 30B ′ for R, G, B lights is used. By piping the branch paths 45r, 45g, and 45b branched from the duct 45 serving as the duct means on each bottom face 31a of the triangular prism 31, the internal pressure of the triangular prism 31 for each color light can be kept constant.

  As a result, the deformation amounts of the wire grid polarizer 32 and the reflection type polarizing plate 37 for the R, G, and B light adhered to the respective triangular prisms 31 for the R, G, and B light become the same, so that the color composite image The pixel shift that occurs during the image formation of light is not caused, and the deformation amounts of the wire grid polarizer 32 and the reflection type polarizing plate 37 for each color light can be suppressed as much as possible, and the luminance is increased and the contrast is increased. Therefore, it is possible to contribute to improving the quality and reliability of the projection display device 10B according to the second embodiment, and the triangular prism 31 for each color light is formed in a small size, so that the projection display device 10B can be made compact. Can be achieved.

  Still further, each of the modifications of the second embodiment is adopted for the projection display device 10B of the second embodiment according to the present invention by adopting substantially the same configuration as that of the first and second modifications of the first embodiment. It is clear that it can be configured.

FIG. 11 is a plan view showing the configuration of a projection display apparatus according to Embodiment 3 of the present invention.
FIG. 12 is a perspective view of a reflection type liquid crystal panel assembly for R, G, and B light, a three-color composite cross dichroic prism, and a projection lens as viewed from above in the projection type display apparatus according to Embodiment 3 of the present invention;
FIG. 13 shows a projection display device according to a third embodiment of the present invention, in which the internal pressures of the R, G, B light triangular prisms provided in the R, G, B light reflection liquid crystal panel assemblies are uniform. It is the perspective view which showed the state which connected the duct in order to make it.

  As shown in FIGS. 11 and 12, in the projection type display device 10C according to the third embodiment of the present invention, the R-light reflective liquid crystal panel assembly 30R ″ and the G-light reflective liquid crystal panel assembly 30G ″. In addition, a light-absorbing transmission type liquid crystal panel assembly 30B ″ for B light and a light-absorbing transmission type fixed to the respective incident surfaces 40a to 40c of the three-color composite cross dichroic prism 40 as unnecessary polarized light removing means for each color light. Since only the polarizing plate 39 is different from the first embodiment, the differences from the first embodiment will be briefly described below.

  That is, as shown in FIG. 12, in the projection type display device 10C according to the third embodiment, the R-light reflective liquid crystal panel assembly 30R ″, the G-light reflective liquid crystal panel assembly 30G ″, and the B-light reflective Each of the liquid crystal panel assemblies 30B ″ prepares a triangular prism 31 having a hollow interior for each color light, and each color light from the color separation optical systems 17 to 19 in the triangular prism 31 for each color light. A plate-like wire grid polarizer 32 serving as a polarization separating means is attached to and attached to the first surface 31c formed at an angle of 45 ° with respect to the optical path by an adhesive, and from the color separation optical systems 17-19. Although the reflective liquid crystal panel 33 is attached to the second surface 31d formed orthogonal to the optical path of each color light via the aperture mask plate 34, the color separation optics is the same as in the first embodiment. Series 17-19 A transparent glass plate 38 is attached to a third surface 31e formed parallel to the optical path of each color light by being bonded with an adhesive instead of the transmissive polarizing plate 36 of Example 1, and the transparent glass plate for each color light The second embodiment is different from the first embodiment in that the 38 side faces the incident surfaces 40a to 40c of the three-color composite cross dichroic prism 40 with a gap.

  Along with the above, a light absorption transmissive polarizing plate 39 is fixed to each of the incident surfaces 40a to 40c of the three-color composite cross dichroic prism 40 as unnecessary polarized light removing means for each color light.

  Therefore, in Example 3, the image light of each color from the reflective liquid crystal panel 33 for each color light reflected by the wire grid polarizer 32 for each color light is emitted as it is from the transparent glass plate 38 for each color light. Thereafter, the S-polarized light is transmitted by the transmissive polarizing plate 39 for each color light fixed to the respective incident surfaces 40a to 40c of the three-color composite cross dichroic prism 40 with respect to each color image light transmitted through the transparent glass plate 38 for each color light. Unnecessary polarized light (P-polarized light) other than light is removed, and the image light of each color transmitted through the transmissive polarizing plate 39 for each color light is color-combined by the three-color composition cross dichroic prism 40.

  As shown in FIG. 13, in this third embodiment as well, the R, G, B light provided in the reflective liquid crystal panel assemblies 30R ′ ′, 30G ′ ′, 30B ″ for R, G, B light is used. It is possible to keep the internal pressure of the triangular prism 31 for each color light constant by piping the branch paths 45r, 45g, 45b branched from the duct 45 serving as the duct means to the bottom surface 31a of each triangular prism 31 for use. Become.

  As a result, the deformation amounts of the wire grid polarizers 32 for the R, G, and B light adhered to the triangular prisms 31 for the R, G, and B light become the same, and thus occur when the color composite image light is imaged. And the amount of deformation of the wire grid polarizer 32 for each color light can be suppressed as much as possible, and high brightness and high contrast can be achieved. While contributing to the improvement in quality and reliability of the display device 10C, the triangular prism 31 for each color light is also formed in a small size, so that the projection display device 10C can be downsized.

  Furthermore, by adopting a configuration substantially the same as that of the first and second modifications of the first embodiment for the projection display device 10C of the third embodiment according to the present invention, each modification of the third embodiment. It is clear that it can be configured.

FIG. 14 is a plan view showing a configuration of a projection type display apparatus according to Embodiment 4 of the present invention,
FIG. 15 is a perspective view of a reflection type liquid crystal panel assembly for R, G, and B light, a three-color composite cross dichroic prism, and a projection lens as viewed from above, in the projection display apparatus according to Embodiment 4 of the present invention;
FIG. 16 shows a projection display apparatus according to Embodiment 4 of the present invention, in which the internal pressures of the R, G, B light triangular prisms provided in the R, G, B light reflective liquid crystal panel assemblies are uniform. It is the perspective view which showed the state which connected the duct in order to make it.

  As shown in FIGS. 14 and 15, in the projection type display device 10D of the fourth embodiment, the present invention is implemented for the reflective liquid crystal panel assembly 30R ″ for R light and the reflective liquid crystal panel assembly 30G ″ for G light. Applying the technical idea of Example 3, a light-absorbing transmissive polarizing plate 39 is fixed to each incident surface 40a, 40b of the three-color composite cross dichroic prism 40 as means for removing unnecessary polarized light with respect to R light and G light. On the other hand, the technical idea of the second embodiment is applied to the reflective liquid crystal panel assembly 30B ′ for B light, and unnecessary polarized light is removed from the B light in the reflective liquid crystal panel assembly 30B ′ for B light. A feature is that a reflective polarizing plate 37 having relatively heat resistance and light resistance is used as a means.

  That is, as shown in FIG. 15, in the projection display device 10D of the fourth embodiment, each of the reflection liquid crystal panel assembly 30R ″ for R light and the reflection liquid crystal panel assembly 30G ″ for G light has an internal structure. Is polarized on the first surface 31c formed at an angle of 45 ° with respect to the optical paths of the R light and G light from the color separation optical systems 17 to 19 in the triangular prism 31 for R light and G light formed in a hollow shape. A plate-shaped wire grid polarizer 32 serving as a separating unit is attached by being bonded with an adhesive, and is formed to be orthogonal to the optical paths of the R light and G light from the color separation optical systems 17 to 19. Although the point that the reflective liquid crystal panel 33 is attached to the surface 31d via the aperture mask plate 34 is the same as that of the first embodiment, it is in the optical path of the R light and G light from the color separation optical systems 17-19. On the third surface 31e formed parallel to the The bright glass plate 38 is attached with an adhesive instead of the transmissive polarizing plate 36 of the first embodiment, and the transparent glass plate 38 side for R light and G light is incident on each side of the three-color composite cross dichroic prism 40. The difference from the first embodiment is that it is opposed to the transmission type polarizing plate 39, which is a means for removing unnecessary polarized light for R light and G light, fixed to the surfaces 40a, 40b with a gap. Although it is, it is the same form as Example 3.

  On the other hand, the reflective liquid crystal panel assembly 30B ′ for B light is inclined by 45 ° with respect to the optical path of B light from the color separation optical systems 17 to 19 in the triangular prism 31 for B light having a hollow interior. A plate-shaped wire grid polarizer 32 serving as a polarization separating means is attached to the first surface 31c formed by bonding with an adhesive, and is orthogonal to the optical path of the B light from the color separation optical systems 17-19. Although the point that the reflective liquid crystal panel 33 is attached to the second surface 31d formed through the aperture mask plate 34 is the same as that of the first embodiment, the B light from the color separation optical systems 17 to 19 is used. A reflective polarizing plate 37 serving as a means for removing unnecessary polarized light is attached to the third surface 31e formed in parallel with the optical path of the first embodiment by being bonded with an adhesive instead of the transmissive polarizing plate 36 of the first embodiment. Three colors on the reflective polarizing plate 37 side Although point that are opposed to each other across a gap to the incident surface 40c of the formed cross dichroic prism 40 are different with respect to Example 1, the same form as in Example 2.

  In the fourth embodiment, a wire grid polarizer is used as the reflective polarizing plate 37 only for G light, but this wire grid polarizer is generally a light-absorbing transmissive polarization type with a cost per sheet. It is more expensive than the plate 39.

  Therefore, in consideration of the balance between cost and reliability, a reflective polarizing plate that uses a light-absorbing transmissive polarizing plate 39 for R light and G light and has relatively heat resistance and light resistance for B light. A plate 37 is used. At this time, the reason why the reflection type polarizing plate 37 is used for the B light is that the light absorption type transmissive polarizing plate 39 has a high light absorptance on the short wavelength side and a large amount of heat generation, and for the short wavelength B light. This is because the light resistance is weak and the polarization characteristics of the B light are likely to deteriorate, and it is more effective to improve the B light than the R light and the G light.

  As shown in FIG. 16, in the fourth embodiment as well, for the R, G, B light provided in each of the reflection type liquid crystal panel assemblies 30R ′ ′, 30G ′ ′, 30B ′ for R, G, B light. By connecting the branch paths 45r, 45g, and 45b branched from the duct 45 serving as the duct means to the bottom surface 31a of each triangular prism 31, the internal pressure of the triangular prism 31 for each color light can be kept constant. .

  As a result, the deformation amounts of the wire grid polarizers 32 for the R, G, and B light adhered to the triangular prisms 31 for the R, G, and B light become the same, and thus occur when the color composite image light is imaged. And the deformation amount of the wire grid polarizer 32 for each color light can be suppressed as much as possible, and high brightness and high contrast can be achieved. In addition to contributing to improving the quality and reliability of the display device 10D, the triangular prism 31 for each color light is also formed in a small size, so that the projection display device 10D can be downsized.

  Furthermore, by adopting a configuration substantially the same as that of the first and second modifications of the first embodiment for the projection display device 10D of the fourth embodiment according to the present invention, each modification of the fourth embodiment. It is clear that it can be configured.

It is the top view which showed the whole structure of the projection type display apparatus of Example 1 which concerns on this invention. In the projection display apparatus of Example 1 which concerns on this invention, it is the perspective view which looked at each reflection type liquid crystal panel assembly for R, G, B light, 3 color synthetic | combination cross dichroic prism, and a projection lens from the upper direction. (A)-(c) is a figure for demonstrating the wire grid polarizer in a reflection type liquid crystal panel assembly in the projection type display apparatus of Example 1 which concerns on this invention. In the projection display device according to the first embodiment of the present invention, when the reflective liquid crystal panel assembly for R, G, B light, the three-color composite cross dichroic prism, and the projection lens are viewed from below, R, G, It is the perspective view which showed the state which piped the duct in order to equalize the internal pressure of each triangular prism for B light. In the projection display apparatus according to the first embodiment of the present invention, in order to equalize the internal pressure of each triangular prism for R, G, B light provided in each reflective liquid crystal panel assembly for R, G, B light. It is the perspective view which showed the state which piped the duct. In the first modification obtained by partially modifying the projection display device according to the first embodiment of the present invention, each of the R, G, and B light beams provided in each of the reflection type liquid crystal panel assemblies for the R, G, and B lights is used. It is the perspective view which showed the state which piped the duct in order to equalize the internal pressure of a triangular prism. In Modification 2 in which the projection display device of Embodiment 1 according to the present invention is partially modified, each of the R, G, B light provided in each of the reflective liquid crystal panel assemblies for R, G, B light is used. It is the perspective view which showed the state which piped the duct through the gas communication box in order to equalize the internal pressure of a triangular prism. It is the top view which showed the structure of the projection type display apparatus of Example 2 which concerns on this invention. FIG. 9 is a perspective view of a reflection type liquid crystal panel assembly for R, G, and B light, a three-color composite cross dichroic prism, and a projection lens, as viewed from above, in the projection display apparatus according to Embodiment 2 of the present invention. is there. In the projection display apparatus according to the second embodiment of the present invention, in order to equalize the internal pressure of each triangular prism for R, G, B light provided in each reflective liquid crystal panel assembly for R, G, B light. It is the perspective view which showed the state which connected the duct to. It is the top view which showed the structure of the projection type display apparatus of Example 3 which concerns on this invention. In the projection display apparatus of Example 3 which concerns on this invention, it is the perspective view which looked at each reflection type liquid crystal panel assembly for R, G, B light, 3 color synthetic | combination cross dichroic prism, and a projection lens from the upper direction. In the projection display apparatus according to Embodiment 3 of the present invention, in order to equalize the internal pressure of each triangular prism for R, G, B light provided in each reflective liquid crystal panel assembly for R, G, B light. It is the perspective view which showed the state which connected the duct to. It is the top view which showed the structure of the projection type display apparatus of Example 4 which concerns on this invention. In the projection type display apparatus of Example 4 which concerns on this invention, it is the perspective view which looked at each reflection type liquid crystal panel assembly for R, G, B light, 3 color synthetic | combination cross dichroic prism, and a projection lens from the upper direction. In the projection display apparatus according to Embodiment 4 of the present invention, in order to equalize the internal pressure of each triangular prism for R, G, B light provided in each reflection type liquid crystal panel assembly for R, G, B light. It is the perspective view which showed the state which connected the duct to. It is the block diagram which showed the projection type display apparatus of the prior art example.

Explanation of symbols

10A: Projection type display device of Example 1,
10B ... Projection type display device of Example 2,
10C: Projection type display device of Example 3,
10D ... Projection type display device of Example 4,
11 ... Light source, 15 ... Polarization conversion optical element (polarization conversion prism array),
17 ... 1st dichroic mirror, 19 ... 2nd dichroic mirror,
25 ... Base stand,
30R, 30R ′, 30R ″... Reflective liquid crystal panel assembly for R light,
30G, 30G ′, 30G ″... G light reflection type liquid crystal panel assembly,
30B, 30B ′, 30B ″... B light reflection type liquid crystal panel assembly,
31 ... Triangular prism, 31a ... Upper surface, 31b ... Lower surface, 31c-31e ... 1st surface-3rd surface,
32 ... Wire grid polarizer,
33 ... reflective spatial light modulator (reflective liquid crystal panel),
34 ... Aperture mask plate, 35 ... Heat sink,
36 ... Transmission type polarizing plate, 37 ... Reflection type polarizing plate,
38 ... Transparent glass plate, 39 ... Transmission type polarizing plate,
40 ... 3 color composite cross dichroic prism,
40a to 40c: entrance surface, 40d: exit surface,
42 ... projection lens,
45 ... Duct, 45r, 45g, 45b ... Branch,
46 ... Pressure adjustment, 47 ... Gas communication box, 48a-48c ... Duct.

Claims (1)

A light source;
A color separation optical system that separates the light emitted from the light source into R, G, and B color lights;
The R light, the G light, and the B light are respectively transmitted in one direction, and the transmitted R light, the G light, and the B light are reflected on each color light by a reflective spatial light modulator for each color light. A wire grid polarizer for each color light that reflects a polarized light component in the other direction different from the polarized light component in the one direction obtained by performing light modulation according to the image signal of each color as image light of each color;
Polarizing plate for each color light that is emitted by removing unnecessary polarization components from the image light of each color reflected from the reflective spatial light modulation element for each color light reflected by the wire grid polarizer for each color light When,
A color synthesizing optical system that synthesizes the image light of each color emitted from the polarizing plate for each color light and emits it as color synthesized image light; and
A projection display device including a projection lens for projecting the color composite image light,
A first surface formed at an angle of 45 ° with respect to the optical path of each color light from the color separation optical system in order to attach the wire grid polarizer for each color light; and the reflective spatial light modulation element for each color light And a second surface formed orthogonal to the optical path of each color light from the color separation optical system, and the optical path of each color light from the color separation optical system to attach the polarizing plate for each color light. A triangular surface for each color light having a third surface formed in parallel to each other, a lower surface and an upper surface, and the interior surrounded by a triangular prism shape on each surface is sealed,
A projection type display device comprising: duct means for equalizing the internal pressure of the triangular prisms for each color light.

Images