JP2007183396A - Projection-type display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection-type display apparatus with no deviation of registration with which color image light matching in focus can be obtained. <P>SOLUTION: A triangular prism-shaped supporting member (right-angled triangular prism) 31 for each color light is individually prepared, corresponding to RGB three primary color light. A wire grid polarizer 32 for each color light is attached to a 1st face 31c of the triangular prism-shaped support member 31, a reflection-type liquid crystal panel 33 for each color light is attached to a 2nd face 31d, in a state where positional adjustment to the 2nd face 31d is performed so as to be adjustable in the optical axis direction (K direction) of the reflection-type liquid crystal panel 33 for each color light and further a light transmissive polarizing plate 35 for each color light is attached to a 3rd face 31e. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention optically synthesizes modulated image light of each color displayed on three reflective spatial light modulation elements prepared for each color light corresponding to RGB three primary color lights, and the color image light is screened by a projection lens. The present invention relates to a projection display device that displays an enlarged image on the top.

  Recently, video information has become more diversified and higher image quality, and high-quality image data represented by the high definition broadcasting standard and the SVGA standard of computer graphics has increased. Projection display devices are actively used.

  Among the projection display devices of this type, the three-plate projection display device optically modulates the modulated image light of each color displayed on the three spatial light modulation elements prepared for each color light corresponding to the RGB three primary color lights. The color image light is enlarged and displayed on the screen by the projection lens.

  At this time, the projection type display device is applied with a transmissive spatial light modulator, applied with a reflective spatial light modulator, or DMD (Digital Mirror Device) depending on the type of spatial light modulator applied thereto. There is something that applied.

  The transmissive spatial light modulator and the DMD can be reduced in size easily because of the relatively simple optical configuration, but are difficult to achieve high resolution. On the other hand, the reflective spatial light modulator is advantageous for increasing the resolution, but it is difficult to reduce the size because the optical configuration is complicated.

  In particular, a projection display device to which a reflective spatial light modulator is applied separates incident light applied to the reflective spatial light modulator from reflected light that has been modulated and reflected by the reflective spatial light modulator. Therefore, a polarization beam splitter is required. In order to achieve high contrast, two or more polarization beam splitters usually act on one reflective spatial light modulator, which has complicated the optical configuration of the projection display device. A plurality of polarizing beam splitters are arranged at a close distance, and are bonded and fixed to a ceramic base or the like to constitute an optical system, thereby achieving miniaturization.

  In this projection display device, when optically synthesizing the modulated image light of each color displayed on the three reflective spatial light modulators corresponding to the RGB three primary color lights, the optical of the reflective spatial light modulator for each color light If the position with respect to the target image synthesizing means is shifted, the registration of the color image light displayed enlarged on the screen is shifted and the image quality is impaired.

  On the other hand, in recent years, reflection type spatial light modulators with a large number of display pixels have been used due to high definition, and the size of one pixel has come to be less than 10 μm. When the size of one pixel is as large as several tens of μm, the mounting error of several μm does not matter, but when the size of one pixel is 10 μm or less, the mounting error of several μm becomes a registration error and a color shift. Will occur.

Therefore, the present applicant can maintain the accuracy of registration adjustment even when the reflective spatial light modulator is detached, and can be firmly fixed to the ceramic base material in which the reflective spatial light modulator is vertically arranged. An optical device manufacturing method and a projection display device have been proposed previously (see, for example, Patent Document 1).
JP 2004-325917 A

  A conventional projection display device is disclosed in the above-mentioned Patent Document 1 (Japanese Patent Laid-Open No. 2004-325917), and although not shown here, three types of light prepared for each color light corresponding to the RGB three primary color lights are provided. A reflective spatial light modulator, a plurality of polarizing beam splitters, and a plurality of color polarizing filters are fixed to a ceramic base material from above and below, and a plurality of element fixing brackets are attached to the upper and lower ceramic base materials by a ceramic adhesive. The element package fixing the reflective spatial light modulation element is fixed to a plurality of element fixing brackets by soldering while further adjusting the registration. By doing so, the accuracy of registration adjustment can be maintained because there is no influence of peeling stress or heat on the ceramic base material and the element package even if the reflective spatial light modulation element is detached, and the reflective space The light modulation element can be firmly fixed to the ceramic base material arranged vertically.

  By the way, in the above-described conventional projection display device, as described above, the element package holding the reflective spatial light modulator is fixed to a plurality of element fixing brackets by soldering while performing registration adjustment. Therefore, when the heat of soldering is cooled, there is a risk that the reflection type spatial light modulation element is displaced, which causes a displacement.

  Therefore, it is possible to easily perform registration adjustment for the reflective spatial light modulator for each color light without soldering to the element fixing bracket, and high contrast performance can be obtained without using a polarizing beam splitter. What is desired is a projection display device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the invention according to claim 1 is a reflective spatial light modulation element for each color light that modulates each color light of R, G, B with a signal for each color light. When,
Each color light illuminating means for illuminating the R-light, G-light, and B-light on the reflective spatial light modulator for each color light,
The first polarized component light of each color light from each color light illuminating means is transmitted and incident on the reflection type spatial light modulation element for each color light, and is modulated by the reflection type spatial light modulation element for each color light. A wire grid polarizer for each color light that reflects the second polarized component light of each obtained color light;
A color synthesis optical system that emits color image light by color-synthesizing the second polarized component light of each color light reflected by the wire grid polarizer for each color light;
A first surface that is disposed in close proximity to each incident surface of the color synthesis optical system and to which the wire grid polarizer for each color light is attached, and a reflective spatial light modulation element for each color light is a position adjustment mechanism unit A support member for each color light having at least a second surface attached via
A projection lens that projects the color image light from the color synthesis optical system;
The position adjustment mechanism is
At least one positioning unit that is detachably attached to the second surface of each color light supporting member and that has a plurality of positioning pins fixed in the direction of the optical axis of the reflective spatial light modulator for each color light. A pin support plate;
The reflective spatial light modulator for each color light whose position is adjusted with respect to the second surface of the support member for each color light is fixed, and the reflective spatial light for each color light along the plurality of positioning pins. A projection display device comprising a reflective spatial light modulation element support plate that can be adjusted in the optical axis direction of the modulation element.

Furthermore, the invention according to claim 2 is the projection type display device according to claim 1,
The one or more positioning pin support plates and the reflective spatial light modulation element support plate may be a projection display device using the same material as the support member for each color light.

  According to the projection type display device of claim 1, in particular, each color light in a state in which the position of the reflective spatial light modulation element for each color light is adjusted with respect to the second surface on the second surface of each color light support member. The reflective spatial light modulator for each color light is attached so that it can be adjusted in the optical axis direction. Therefore, the reflective spatial light modulator for each color light is used for each color light after the registration adjustment and the focus adjustment are completed. When color-modulated image light of each color from the reflective spatial light modulator is color-combined by a three-color composite cross dichroic prism, color image light with no registration and in focus is obtained.

  Also, since no conventional soldering is used, there is no positional deviation of the reflective spatial light modulator for each color light, and the color-combined color image light has no registration deviation and the focus. Will be in good condition.

  Further, according to the second aspect of the invention, in particular, the one or more positioning pin support plates and the reflective spatial light modulation element support plate are made of the same material as the support member for each color light. Thermal expansion and thermal contraction generated in the pin support plate, the reflective spatial light modulation element support plate, and the support members for each color light can be suppressed to the same extent.

  Hereinafter, an embodiment of a projection display device according to the present invention will be described in detail with reference to FIGS.

FIG. 1 is a plan view for explaining a projection display device according to an embodiment of the present invention.
FIGS. 2A and 2B show a state in which the triangular prism support member for each color light and the three-color composite cross dichroic prism are fixed to the upper surface of the base table in the projection type display device of the embodiment according to the present invention. Perspective view, side view,
FIG. 3 is an enlarged perspective view of each reflective liquid crystal panel assembly for R, G, and B light in the projection display device according to the embodiment of the present invention.
4A to 4C are diagrams for explaining a wire grid polarizer in the reflective liquid crystal panel assembly in the projection display device according to the embodiment of the present invention.

  As shown in FIG. 1, the projection display device 10 of the embodiment according to the present invention uses a reflection 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. Configured.

  In the projection display device 10 of this embodiment, a light source 11 that emits unpolarized 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 modulation elements (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 modulated image light of each color light-modulated by the 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 unpolarized 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 parabolic. A first fly-eye lens array 13 that is substantially parallel light and is attached to the front surface of the parabolic mirror 12 by being reflected by the surface 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. In addition, 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 front 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 front 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 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, the polarized light in one predetermined direction obtained by the polarization conversion prism array 15 is described as P-polarized light that is first polarized component light. However, the present invention is not limited to this, and white light from the light source 11 is not limited thereto. Can be converted to S-polarized light by the polarization conversion prism array 15.

  Thereafter, the white light of the P-polarized light (first polarized component light) that has passed through the polarization conversion prism array 15 enters 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 and second dichroic mirrors 17 and 19 constitute a color separation optical system that separates white light from the light source 11 into R light, G light, and B light. Each constituent member up to the optical systems 17 and 19 has each color light illuminating means for illuminating the reflection liquid crystal panel (reflection spatial light modulator) 33 for each color light with R light, G light, and B light, respectively. It has become.

  In this embodiment, the white light from the light source 11 is described as being color-separated into R light, G light, and B light by the color separation optical systems 17 and 19, but the present invention is not limited to this. For example, if LED light sources for R light, G light, and B light that respectively emit R light, G light, and B light are used, it is not necessary to provide the color separation optical systems 17 and 19, so that each color light A reflection type liquid crystal panel for each color light corresponding to each color light is converted into a unidirectional polarization component (first polarization component) of each of R light, G light, and B light emitted from an LED light source for each color light serving as an illumination means. 33 may be directly illuminated.

  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. The light incident surfaces 40a to 40c are arranged in close proximity to each other.

  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 mounted on the upper surface 25a of the base base 25 formed using a plastic material such as fine ceramics, bulk molding compound (BMC), a nickel alloy material, or the like.

  Specifically, the lower surface 40 g of the three-color composite cross dichroic prism 40 is fixed to the upper surface 25 a of the base table 25 using an adhesive, and a plurality of screws 26 are drilled into the base table 25 from the back surface 25 b of the base table 25. By inserting the plurality of screws 26 into the respective screw holes (not shown) formed in the lower surface 31a of the triangular prism-shaped support member 31 for each color light by inserting into the plurality of mounting holes 25c provided. The lower surface 31 a of the triangular prism support member 31 is fixed to the upper surface 25 a of the base base 25. Note that the lower surface 31a of the triangular prism support member 31 for each color light may be fixed to the upper surface 25a of the base base 25 using an adhesive.

  Further, as shown in an enlarged view in FIG. 3, each of 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 assembly 30B is made of an aluminum plate. A first surface 31c that is inclined by 45 ° with respect to the optical axis of each color light by each color light illuminating means between the lower surface 31a and the upper surface 31b of a right triangle using a stainless steel plate or the like, and the first surface 31c A triangular prism-shaped support member (right triangular prism) in which a second surface 31d and a third surface 31e that are orthogonal to each other are formed in a frame shape, and the interior surrounded by the surfaces 31a to 31e is formed into a hollow cavity. 31 is prepared for each color light.

  The first surfaces 31c arranged at 45 ° with respect to the optical axis of each color light by the respective color light illumination means in the triangular prism support member 31 for each color light are included in each color light from each color light illumination means. A wire grid polarizer 32 for each color light that reflects each color light of the second polarization component that is incident on the reflection type liquid crystal panel 33 for each color light after being transmitted through each color light of one polarization component and reflected and modulated. Reflective liquid crystal for each color light on a second surface 31d that is attached using an adhesive or the like and arranged orthogonal to the optical axis of each transmitted light that has passed through the wire grid polarizer 32 for each color light. The panel 33 is attached via a reflective liquid crystal panel position adjusting mechanism 50 (or 50A to 50C) described later.

  Further, each color light is reflected on the third surface 31e arranged orthogonal to the optical axis of each reflected light obtained by reflecting the reflected light from the reflective liquid crystal panel 33 for each color light by the wire grid polarizer 32 for each color light. A transmissive polarizing plate 35 for each color light that is emitted by removing each unnecessary color light of the first polarization component from each color light of the second polarization component reflected by the wire grid polarizer 32 is attached using an adhesive. It has been.

  In addition, instead of the transmissive polarizing plate 35 for each color light, a light transmissive optical glass plate (not shown) may be attached to the third surface of the triangular prism support member 31 for each color light. A transmissive polarizing plate (not shown) for removing each polarized light component that removes unnecessary polarization components may be fixed to each of the incident surfaces 40a to 40c of the three-color composite cross dichroic prism 40 using an adhesive. Therefore, a light transmissive optical plate such as a transmissive polarizing plate 35 or a light transmissive optical glass plate (not shown) may be attached to the third surface of the triangular prism support member 31 for each color light.

  Further, an inert gas such as nitrogen or argon is introduced into the internal space surrounded by a right triangular prism shape by the lower surface 31a and the upper surface 31b of the triangular columnar support member 31 and the first surface 31c to the third surface 31e. In the state sealed with dust and the like, the transmissive polarizing plate 35 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. ing.

  The triangular prism-shaped support member 31 is not limited to a right triangular prism, that is, the first surface 31c to which the wire grid polarizer 32 for each color light is bonded and the reflective liquid crystal panel 33 for each color light. Although the angle formed by the bonded second surface 31d needs to be 45 °, each color light of the second polarization component reflected by the wire grid polarizer 32 for each color light bonded to the first surface 31c is used. The angle formed by the second surface 31d and the third surface 31e is not limited to 90 °, as long as it can be transmitted from the third surface 31e.

  Still further, in the case where the dust countermeasures are sufficiently taken in the projection display device 10 (FIG. 1), the projection display device 10 is not limited to the triangular prism support member 31 of the embodiment, but of the three-color composite cross dichroic prism 40. A first surface that is disposed in close proximity to each of the incident surfaces 40a to 40c and has a 45 ° inclination angle with respect to the optical axis of each incident color light, and to which the wire grid polarizer 32 for each color light is attached, and each color The reflective liquid crystal panel 33 for each color light, which will be described later, is arranged perpendicular to the optical axis of the first polarized component light of each color light transmitted through the light wire grid polarizer 32. It may be a support member for each color light having at least the second surface attached via the mechanism unit 50 (or 50A to 50C).

  Further, the wire grid polarizer 32, the reflective liquid crystal panel 33, and the transmissive polarizing plate 35 attached to the triangular prism support members 31 for each color light are suspended from the base table 25 (FIG. 2).

  In addition, the reflective liquid crystal panel 33 has a heat sink 34 for cooling the reflective liquid crystal panel 33 attached to the back surface, and a fin portion 34 a is projected from the back surface of the heat sink 34. A wave plate (not shown) may be attached to the front surface of the reflective liquid crystal panel 33 as necessary.

  For example, when the R light of the P-polarized component (first polarization component) is incident on the reflective liquid crystal panel assembly 30R for R light, the wire grid in which the R light of the P-polarized component is attached to the triangular columnar support member 31. The light is transmitted through the polarizer 32 and is incident on the reflective liquid crystal panel 33 for R light.

  Although the above-described wire grid polarizer 32 has the same polarization separation function as the polarization beam splitter as described in the prior art, the polarization beam splitter does not generate shading due to thermal stress, so that lead is contained in transparent glass. In contrast, lead that is harmful in terms of global environmental problems is used in the wire grid polarizer 32, so that no pollution problem occurs.

  In addition, as shown in FIG. 4A, the above-described wire grid polarizer 23 is formed by arranging a large number of metal wires 32b such as aluminum regularly in a stripe pattern at a pitch of 140 nm on an optical glass plate 32a. The polarization component perpendicular to the metal line 32b (for example, P-polarized light) is transmitted as it is, and the polarization component parallel to the metal line 32b (for example, S-polarized light) has a function of reflecting.

  As shown in FIG. 4B, when the incident angle θ of the incident light by the P-polarized light to the wire grid polarizer 32 is used as a parameter, the wavelength dependence of the transmittance of the P-polarized component is shown in FIG. ). In FIG. 4C, a is an incident angle θ of incident light by P-polarized light to the wire grid polarizer 32, 0 is an incident angle θ of −15 °, and c is an incident angle θ of + 15 °. Shows the case. The incident angle θ is an angle formed by 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 45 ° with respect to the optical axis. In the wire grid polarizer 32, even if the incident angle θ reaches ± 15 °, the wavelength dependence 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 FIG. 1 again, when R light by P-polarized light that has passed through the wire grid polarizer 32 for R light is incident on the reflective liquid crystal panel 33 for R light, R is reflected in the reflective liquid crystal panel 33 for R light. The light beam reflected after being modulated in accordance with the image signal of light returns to the wire grid polarizer 32 for R light again. Here, in the wire grid polarizer 32 for R light, unlike the P-polarized light that is R light of the first polarization component that illuminates the reflective liquid crystal panel 33 for R light, Only the luminous flux of S-polarized light (second polarized component light), which is R light of the second polarized component modulated and reflected, is reflected.

  At this time, the reflective liquid crystal panel 33 is provided with switching elements on a silicon substrate in a matrix, and a plurality of pixel electrodes made of metal such as aluminum are provided on the silicon substrate via an insulating layer above the switching elements. 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 modulated image light in which the incident light is reflected 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 (second polarized component light) reflected by the wire grid polarizer 32 for R light is transmitted from the three-color composite cross dichroic prism 40 within the triangular prism-shaped support member 31 for R light. P-polarized light which is incident on a transmission-type polarizing plate 35 serving as a means for removing unnecessary polarized light for R light and is disposed opposite to the incident surface 40a, and is R light of the first polarization component which is not required by the transmission-type polarizing plate 35. The R light of the S-polarized component (second polarized component) that has passed through the transmissive polarizing plate 35 is made incident from the incident surface 40 a of the three-color composite cross dichroic prism 40 while removing the light.

  At this time, the transmissive polarizing plate 35 serving as the unnecessary polarized light removing means described above is displayed as it is when the P-polarized light which is unnecessary polarized light is mixed in the reflected light reflected by the wire grid polarizer 32. This is a factor for reducing the contrast ratio of the image, and is provided for removing unnecessary P-polarized light.

  And as the transmissive polarizing plate 35, a dichroic material such as iodine or an organic dye is dyed and adsorbed on a base film (polyvinyl alcohol; PVA), and is highly stretched and oriented, thereby absorbing dichroism. 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 35 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 35 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 in 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 35. These polarization characteristics and antireflection film characteristics are preferably optimized for each of R, G, and B colors.

  Further, although the transmissive polarizing plate 35 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 modulated image lights of R light, G light, and B light incident from the respective 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 second 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 is incident on the projection lens 42 via the quarter wavelength plate 41. The projection lens 42 projects an enlarged image onto a screen (not shown) to form a real image, and displays 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 it 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 reflection type liquid crystal panel 33 side through the polarizing plate 35 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, the reflection type liquid crystal panel position adjustment mechanism that constitutes a part of the main part of the embodiment will be described with reference to FIGS.

FIG. 5 is an exploded perspective view illustrating the reflective liquid crystal panel position adjustment mechanism unit in an exploded manner in the projection display device according to the embodiment of the present invention.
FIG. 6 is an exploded perspective view showing an exploded view for explaining a first modification of the reflective liquid crystal panel position adjusting mechanism portion in the projection type display apparatus of the embodiment according to the present invention,
FIG. 7 is an exploded perspective view showing an exploded view for explaining a second modification of the reflective liquid crystal panel position adjusting mechanism in the projection display device of the embodiment according to the present invention,
FIG. 8 is an exploded perspective view showing an exploded view for explaining a third modification of the reflective liquid crystal panel position adjusting mechanism in the projection type display apparatus according to the embodiment of the present invention.

  First, in the reflective liquid crystal panel position adjusting mechanism 50 of the embodiment shown in FIG. 5, the wire grid polarizer 32 is attached to the first surface 31c of the triangular prism support member 31, and the transmissive polarization is applied to the third surface 31e. With the plate 35 attached, the reflective liquid crystal panel 33 attached to the second surface 31d side is attached to the second surface 31d and the position of the reflective liquid crystal panel 33 is adjusted (registration adjustment). K can be adjusted.

  More specifically, a rectangular hole 31d1 corresponding to the size of the image frame of the reflective liquid crystal panel 33 is formed in the second surface 31d of the triangular prism-shaped support member 31 so as to penetrate therethrough. A total of four screw holes 31d2 are formed on the top, bottom, left, and right in the vicinity of the hole 31d1.

  Further, on the front side of the second surface 31 d of the triangular columnar support member 31, two positioning pins 51 each having a tip tapered with a stainless steel bar are provided in the optical axis direction K of the reflective liquid crystal panel 33. A pair of positioning pin support plates 52 and 52, which are fixed to each other by press-fitting to the left and right, and are formed by penetrating two mounting round holes 52a between the two left and right positioning pins 51, have the same shape. Two are prepared separately on the top and bottom. The pair of positioning pin support plates 52, 52 are formed in a plate shape with a narrow width so as not to block the rectangular hole 31d1 formed in the second surface 31d of the triangular columnar support member 31.

  And a pair of positioning pin support plates 52 and 52 inserts a total of four screws 53 into each mounting round hole 52a, and each screw hole formed above and below the second surface 31d of the triangular columnar support member 31. It is detachably attached to 31d2.

  In addition, a reflective liquid crystal panel 33 and a reflective liquid crystal panel support plate 54 are prepared on the near side of the figure with respect to the pair of positioning pin support plates 52 and 52.

  The reflective liquid crystal panel support plate 54 described above is formed in a rectangular flat plate having substantially the same dimensions as the second surface 31 d of the triangular prism support member 31, and inside the back surface of the reflective liquid crystal panel 33. A rectangular hole 54a through which the fin portion 34a of the heat sink 34 attached to the surface of the heat sink 34 is formed is penetrated, and a total of four positioning holes 54b vertically and horizontally in the vicinity of the rectangular hole 54a support the pair of positioning pins described above. Aligned and formed through a total of four positioning pins 51 fixed to the plates 52 and 52 respectively, and further, the above-described total of four screws 53 between the left and right positioning holes 54b on the upper and lower sides. A total of four escape holes 54c for inserting and removing are inserted.

  At this time, the pair of positioning pin support plates 52 and 52 and the reflective liquid crystal panel support plate 54 are formed using the same material as the triangular prism support member 31 formed using an aluminum plate or a stainless plate. As a result, the thermal expansion and contraction generated in the triangular columnar support member 31, the pair of positioning pin support plates 52, and the reflective liquid crystal panel support plate 54 can be suppressed to the same extent.

  When the reflective liquid crystal panel 33 is attached to the second surface 31d side of the triangular prism support member 31, the heat sink 34 is attached to the back surface of the reflective liquid crystal panel 33 and the two positioning pins 51 are fixed. A pair of positioning pin support plates 52, 52 are attached in advance above and below the second surface 31 d of the triangular columnar support member 31. Further, a total of four positioning pins 51 fixed to the pair of positioning pin support plates 52, 52 are fitted into a total of four positioning holes 54b formed on the top, bottom, left, and right of the reflective liquid crystal panel support plate 54, thereby reflecting the reflective type. The liquid crystal panel support plate 54 is temporarily supported on each positioning pin 51.

  Thereafter, the reflective liquid crystal panel 33 with the heat sink 34 held on the robot arm (not shown) attached is inserted between the pair of positioning pin support plates 52, 52 and the reflective liquid crystal panel support plate 54. The reflective liquid crystal panel 33 to which the heat sink 34 is attached is moved two-dimensionally in the X direction and / or Y direction with respect to the second surface 31d of the triangular columnar support member 31 via the robot arm to adjust the attachment position (registration). After the adjustment is performed, the heat sink 34 attached to the back surface of the reflective liquid crystal panel 33 while maintaining the attachment position adjustment state is applied to the reflective liquid crystal panel support plate 54 with UV light (ultraviolet light) using a UV curable adhesive. ).

  At this time, the registration adjustment of the reflective liquid crystal panel 33 is performed by adjusting 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 for B light shown in FIG. 30B is assembled, and among the three reflective liquid crystal panel assemblies 30R, 30G, and 30B, for example, the reflective liquid crystal panel assembly 30G for G light is set as a reference unit at the time of registration adjustment.

  The reason for this will be explained. When color image light is projected onto a screen (not shown), the G light has the most influence on the resolution among the three primary colors of R, G, and B. In addition, the R light affects the resolution next, and the B light has a relatively small ratio of affecting the resolution. Accordingly, since the registration adjustment of the reflective liquid crystal panel 33 is relative displacement adjustment, the reflective liquid crystal panel 33 in the G light reflective liquid crystal panel assembly 30G that most affects the resolution is first positioned. In the reflective liquid crystal panel assembly 30R for R light and the reflective liquid crystal panel assembly 30B for B light so as to match the modulated image light from the reflective liquid crystal panel 33 in the reflective liquid crystal panel assembly 30G for G light. If the mounting position adjustment (registration adjustment) is performed for each of the reflective liquid crystal panels 33, the color image of the modulated image light from the reflective liquid crystal panel 33 for each color light is color-combined by the three-color composite cross dichroic prism 41. Sometimes color image light without registration is obtained.

  Returning to FIG. 5, the reflection type liquid crystal panel support plate 54 to which the heat sink 34 attached to the back surface of the reflection type liquid crystal panel 33 whose attachment position has been adjusted is adhered is reflected along the four positioning pins 51 and the reflection type liquid crystal panel. 33 is moved in the optical axis direction K to perform attachment position adjustment (focus adjustment), and a total of four positioning pins 51 are placed in a total of four positioning holes 54b while maintaining the focus adjustment state. Are bonded by irradiation with UV light (ultraviolet rays).

  As a result, the reflective liquid crystal panel 33 is attached to the second surface 31d side of the triangular prism support member 31 in a state where the registration adjustment and the focus adjustment are completed, and thus the reflective liquid crystal panel 33 for each color light. When the color-modulated image light of each color is color-combined by the three-color composition cross dichroic prism 41, color image light having no registration and in focus is obtained.

  When the reflective liquid crystal panel 33 is replaced for some reason, a screwdriver (not shown) is inserted into the relief holes 54c formed on the upper and lower sides and the right and left sides of the reflective liquid crystal panel support plate 54, and a pair of positioning pins. It is possible to remove the support plates 52 and 52 together.

  Next, the reflection type liquid crystal panel position adjustment mechanism 50A of the first modification shown in FIG. 6 is separated into upper and lower parts in the reflection type liquid crystal panel position adjustment mechanism 50 of the embodiment described above with reference to FIG. Instead of the pair of positioning pin support plates 52, 52 provided in place of the above, only one positioning pin support plate 55 in which these are integrated is replaced, so that the reflective liquid crystal panel position adjusting mechanism unit 50 of the embodiment is used. The same members are indicated by the same reference numerals, and only different points from the embodiment will be described here.

  That is, in the reflective liquid crystal panel position adjusting mechanism 50A according to the first modification, the single positioning pin support plate 55 attached to the front side of the second surface 31d of the triangular columnar support member 31 is an aluminum plate or a stainless plate. The triangular prism-shaped support member 31 is formed on a rectangular flat plate with the same dimensions as the second surface 31d of the triangular prism-shaped support member 31 using the same material as the triangular prism-shaped support member 31. The thermal expansion and contraction generated in the member 31, the reflective liquid crystal panel support plate 54, and the positioning pin support plate 55 can be suppressed to the same extent.

  In addition, a rectangular hole 55a corresponding to the size of the image frame of the reflective liquid crystal panel 33 is formed through the positioning pin support plate 55, and is vertically and horizontally near the rectangular hole 55a. A total of four positioning pins 51 each having a tapered tip are fixed by press-fitting or the like toward the optical axis direction K of the reflective liquid crystal panel 33, and between the left and right positioning pins 51 on the upper and lower sides. A total of four mounting round holes 55b are formed therethrough.

  The positioning pin support plate 55 is detachably attached to each screw hole 31d2 formed above and below the second surface 31d of the triangular columnar support member 31 by inserting a total of four screws 53 into the respective mounting round holes 55b. The number of parts of the positioning pin support plate is reduced with respect to the embodiment described above.

  Therefore, also in the first modification, the reflective liquid crystal panel 33 attached with the heat sink 34 via the robot arm is two-dimensionally attached to the second surface 31d of the triangular columnar support member 31 and the position is adjusted. The heat sink 34 attached to the back surface of the reflective liquid crystal panel 33 is adhered to the reflective liquid crystal panel support plate 54 by irradiation with UV light (ultraviolet light) using a UV curable adhesive, and then the mounting position is adjusted. The reflective liquid crystal panel support plate 54 to which the reflective liquid crystal panel 33 is bonded is moved along the optical axis direction K of the reflective liquid crystal panel 33 along a total of four positioning pins 51 to adjust the mounting position (focus adjustment). The reflective liquid crystal panel support plate 54 is bonded to a total of four positioning pins 51.

  Next, the reflection type liquid crystal panel position adjustment mechanism 50B of the modification 2 shown in FIG. 7 is the reflection type liquid crystal panel in the reflection type liquid crystal panel position adjustment mechanism 50 of the embodiment described above with reference to FIG. The surface on the reflective liquid crystal panel support plate 54 side of the heat sink 34 attached to the rear surface of 33 is fixed in advance to the spacer plate 56 with a total of four screws 57, and accordingly, the reflective liquid crystal panel support plate 54 is attached. The only difference is that a total of four escape holes 54d for escaping a total of four screws 57 are drilled through, so that the same as the reflective liquid crystal panel position adjusting mechanism 50 of the embodiment. The members are shown with the same reference numerals, and only the differences from the embodiment will be described here.

  That is, in the reflective liquid crystal panel position adjusting mechanism 50B of the second modification, the spacer plate 56 attached to the surface of the heat sink 34 attached to the back surface of the reflective liquid crystal panel 33 on the reflective liquid crystal panel support plate 54 side is made of aluminum. It is formed on a rectangular flat plate with the same dimensions as the external dimensions of the reflective liquid crystal panel 33 using the same material as the triangular prism support member 31 formed using a plate material or a stainless plate material.

  In the second modification, when the reflective liquid crystal panel 33 is attached to the second surface 31d side of the triangular columnar support member 31, the heat sink 34 is attached to the back surface of the reflective liquid crystal panel 33, and then two positioning pins are provided. A pair of positioning pin support plates 52, 52 to which 51 is fixed is attached in advance above and below the second surface 31 d of the triangular columnar support member 31, and the reflective type of the heat sink 34 attached to the back surface of the reflective liquid crystal panel 33. A spacer plate 56 is attached in advance to the surface on the liquid crystal panel support plate 54 side. Further, a total of four positioning pins 51 fixed to the pair of positioning pin support plates 52, 52 are fitted into a total of four positioning holes 54b formed on the top, bottom, left, and right of the reflective liquid crystal panel support plate 54, thereby reflecting the reflective type. The liquid crystal panel support plate 54 is temporarily supported on each positioning pin 51.

  Thereafter, the reflective liquid crystal panel 33 attached to the spacer plate 56 via the heat sink 34 is interposed between the pair of positioning pin support plates 52 and 52 and the reflective liquid crystal panel support plate 54 via a robot arm (not shown). The reflection type liquid crystal panel 33 is moved two-dimensionally in the X direction and / or Y direction with respect to the second surface 31d of the triangular prism-shaped support member 31 via the robot arm to adjust the mounting position (resist The spacer plate 56 to which the reflective liquid crystal panel 33 is attached via the heat sink 34 while the attachment position adjustment state is maintained is applied to the reflective liquid crystal panel support plate 54 using a UV curable adhesive. Bonding is performed by irradiation with UV light (ultraviolet light).

  Further, the reflective liquid crystal panel 33 is moved in the optical axis direction K integrally with the spacer plate 56 adhered to the reflective liquid crystal panel support plate 54 along the total of four positioning pins 51 to adjust the mounting position (focus adjustment). ), And a total of four positioning pins 51 are adhered to the total of four positioning holes 54b by irradiation with UV light (ultraviolet rays) using a UV curable adhesive while maintaining the focus adjustment state. When the color-modulated image light from the reflective liquid crystal panel 33 for light of each color is color-combined by the three-color composite cross dichroic prism 41, color image light in focus is obtained.

  Therefore, in the second modification, unlike the first and the first modification, the heat sink 34 attached to the back surface of the reflective liquid crystal panel 33 is not directly bonded to the reflective liquid crystal panel support plate 54, but is interposed via the spacer plate 56. Therefore, when replacing the reflective liquid crystal panel 33 attached with the heat sink 34, the heat sink 34 may be removed from the spacer plate 56, so that the expensive reflective liquid crystal panel 33 attached with the heat sink 34 is not damaged. It becomes exchangeable.

  Next, the reflective liquid crystal panel position adjusting mechanism 50C according to the modified example 3 shown in FIG. 8 is separated vertically within the reflective liquid crystal panel position adjusting mechanism 50B according to the modified example 2 described above with reference to FIG. Instead of the pair of positioning pin support plates 52 and 52 provided as described above, only the positioning pin support plate 55 in which these are integrated is replaced in the same manner as in the first modification, and detailed description thereof is omitted. .

  Also in the third modified example, unlike the first and the first modified examples, the heat sink 34 attached to the back surface of the reflective liquid crystal panel 33 is not directly bonded to the reflective liquid crystal panel support plate 54, but via the spacer plate 56. When the reflective liquid crystal panel 33 is replaced, the heat sink 34 attached to the back surface of the reflective liquid crystal panel 33 may be removed from the spacer plate 56. Therefore, the expensive reflective liquid crystal panel with the heat sink 34 attached thereto. Exchange is possible without damaging 33.

It is a top view for demonstrating the projection type display apparatus of the Example which concerns on this invention. (A), (b) is a perspective view showing a state in which a triangular prism support member for each color light and a three-color composite cross dichroic prism are fixed to the upper surface of the base table in the projection display device according to the embodiment of the present invention. It is a figure and a side view. FIG. 4 is an enlarged perspective view of each reflective liquid crystal panel assembly for R, G, and B light in the projection display device according to the embodiment of the present invention. (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 the Example which concerns on this invention. FIG. 5 is an exploded perspective view illustrating the reflective liquid crystal panel position adjustment mechanism unit in an exploded manner in order to explain an embodiment of the reflective liquid crystal panel position adjustment mechanism unit in the projection display device according to the embodiment of the present invention. FIG. 7 is an exploded perspective view illustrating the reflective liquid crystal panel position adjusting mechanism unit in the projection display apparatus according to the embodiment of the present invention in order to explain a first modification of the reflective liquid crystal panel position adjustment mechanism unit. FIG. 10 is an exploded perspective view illustrating the reflective liquid crystal panel position adjusting mechanism unit in the projection display apparatus according to the embodiment of the present invention in order to explain a second modification of the position adjustment mechanism unit. In the projection type display apparatus of the Example which concerns on this invention, it is the disassembled perspective view shown disassembled in order to demonstrate the modification 3 of a reflection type liquid crystal panel position adjustment mechanism part.

Explanation of symbols

10 Projection type display device,
11 ... light source, 12 ... parabolic mirror,
13 ... 1st fly eye lens array, 14 ... 2nd fly eye lens array,
15: Polarization conversion optical element (polarization conversion prism array),
17 ... 1st dichroic mirror, 19 ... 2nd dichroic mirror,
25 ... Base stand, 25a ... Upper surface, 25b ... Back surface, 26 ... Screw,
27 ... Top plate, 27a ... Back surface, 27b ... Top surface, 28 ... Screw,
30R ... Reflective liquid crystal panel assembly for R light,
30G ... Reflective liquid crystal panel assembly for G light,
30B ... Reflective liquid crystal panel assembly for B light,
31 ... Triangular prism support member,
31a ... lower surface, 31b ... upper surface, 31c-31e ... 1st surface-3rd surface,
32 ... Wire grid polarizer,
33 ... reflective spatial light modulator (reflective liquid crystal panel),
35. Transmission type polarizing plate,
40 ... 3 color composite cross dichroic prism,
40a to 40c: entrance surface, 40d: exit surface,
40e, 40f: first and second dichroic films, 40g: lower surface, 40h: upper surface,
42 ... projection lens,
50: Reflective liquid crystal panel position adjusting mechanism of the embodiment,
50A: Reflective type liquid crystal panel position adjusting mechanism of Modification 1
50B: Reflective type liquid crystal panel position adjusting mechanism of Modification 2
50C: Reflective type liquid crystal panel position adjusting mechanism of Modification 3
51 ... Positioning pins, 52, 52 ... A pair of positioning pin support plates, 53 ... Screws,
54 ... reflective liquid crystal panel support plate, 55 ... positioning pin support plate,
56: spacer plate, 57: screw.

Claims (2)

A reflective spatial light modulator for each color light that modulates each color light of R, G, B with a signal for each color light;
Each color light illuminating means for illuminating the R-light, G-light, and B-light on the reflective spatial light modulator for each color light,
The first polarized component light of each color light from each color light illuminating means is transmitted and incident on the reflection type spatial light modulation element for each color light, and is modulated by the reflection type spatial light modulation element for each color light. A wire grid polarizer for each color light that reflects the second polarized component light of each obtained color light;
A color synthesis optical system that emits color image light by color-synthesizing the second polarized component light of each color light reflected by the wire grid polarizer for each color light;
A first surface that is disposed in close proximity to each incident surface of the color synthesis optical system and to which the wire grid polarizer for each color light is attached, and a reflective spatial light modulation element for each color light is a position adjustment mechanism unit A support member for each color light having at least a second surface attached via
A projection lens that projects the color image light from the color synthesis optical system;
The position adjustment mechanism is
At least one positioning unit that is detachably attached to the second surface of each color light supporting member and that has a plurality of positioning pins fixed in the direction of the optical axis of the reflective spatial light modulator for each color light. A pin support plate;
The reflective spatial light modulator for each color light whose position is adjusted with respect to the second surface of the support member for each color light is fixed, and the reflective spatial light for each color light along the plurality of positioning pins. A projection type display device comprising: a reflective spatial light modulation element support plate that can be adjusted in the optical axis direction of the modulation element.   2. The projection display device according to claim 1, wherein the one or more positioning pin support plates and the reflective spatial light modulation element support plate are made of the same material as the support members for the respective color lights.

Images