JP2005106947A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a projection image display device for use in a liquid crystal projector or the like. <P>SOLUTION: The image display device has a plurality of image modulation elements having an approximately rectangular image display surfaces and a projection optical system which includes a color compositing system for compositing a plurality of color light beams emitted from the plurality of image modulation elements and projects the composited color light beams onto a projection surface. A direction in which the plurality of color light beams emitted from the plurality of image modulation elements are composited is practically parallel with the direction of a short side of the image display surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a projection type image display apparatus used for a liquid crystal projector or the like.

  Conventionally, in a liquid crystal projector, as shown in Patent Document 1, a cross dichroic prism in which two dichroic mirror layers that reflect light having different wavelength ranges are arranged in an X shape inside a prism has been used for color synthesis. . Since the cross dichroic prism has two dichroic mirror layers arranged in an X shape inside the prism, there is an advantage that the color combining prism can be made small. Further, since the space between the projection lens and the liquid crystal panel is filled with a prism, there is an advantage that the back focus converted to air can be shortened, which is advantageous for miniaturization of the projection lens.

Japanese Patent Application Laid-Open No. H10-228707 discloses color synthesis using a prism other than a cross dichroic prism.
JP 09-318907 A JP 2001-290010 A

  However, in an image display device that projects a horizontally long image (the length in the horizontal direction is longer than the length in the vertical direction) as in the prior art, the liquid crystal panel for red, the liquid crystal panel for blue, and the liquid crystal for green In order to color-combine each color light emitted from the panel in a horizontal plane, the image formed by each panel is a horizontally long image, so that there is a problem that the color synthesis prism is enlarged. It was.

  Furthermore, the cross dichroic prism is composed of four triangular prisms. If the angle accuracy and bonding accuracy of individual prisms are not increased in manufacturing, steps and angular deviations of the dichroic mirror layer are likely to occur, and lines on the screen. Image defects when projecting a pattern, and light and dark vertical lines are likely to occur near the center of the screen when an image with uniform brightness is projected on the screen.

  In order to solve the above-described problems, an image display device according to the present invention includes a plurality of image modulation elements having a substantially rectangular image display surface, and a color for color combining a plurality of color lights emitted from the plurality of image modulation elements. A projection optical system that includes a synthesis system and projects a plurality of color lights that have undergone color synthesis onto a projection surface, and performs color synthesis of the plurality of color lights emitted from the plurality of image modulation elements The color composition direction is substantially parallel to the short side direction of the image display surface.

  Here, the color composition system includes two dichroic layers, has a color composition prism that synthesizes a plurality of color lights emitted from the plurality of image modulation elements, and the two dichroic layers do not cross each other. Is preferred.

  In addition, the color synthesis system includes a plurality of incident surfaces on which a plurality of color lights emitted from the plurality of image modulation elements are incident, and includes a color synthesis prism that color-synthesizes the plurality of color lights. A straight line that passes through the center of the first image display surface of the image display surfaces and is perpendicular to the first image display surface has a plurality of incident surfaces on which light emitted from the first image display surface is incident. It is preferable to shift with respect to a straight line that passes through the center of the first incident surface and is perpendicular to the first incident surface.

  In addition, the color synthesis system includes a plurality of incident surfaces on which a plurality of color lights emitted from the plurality of image modulation elements are incident, and includes a color synthesis prism that color-synthesizes the plurality of color lights. Of the plurality of incident surfaces, the surface on which light emitted from the first image display surface of the plurality of image display surfaces is incident is the first incident surface. When the surface on which light enters from the second image display surface among the surfaces of the prism having the first incident surface and the prism adjacent thereto is defined as the second incident surface, the second image display surface passes through the center of the first image display surface. It is preferable that a straight line perpendicular to one image display surface is shifted to the opposite side to the second incident surface with respect to a straight line passing through the center of the first incident surface and perpendicular to the first incident surface.

  Further, among the plurality of image modulation elements, a first prism having a first incident surface on which light emitted from the first image modulation element is incident, and among the plurality of image modulation elements, the second image A second prism having a second incident surface on which light emitted from the modulation element is incident; and a third prism having a third incident surface on which light emitted from the third image modulation element is incident among the plurality of image modulation elements. Three prisms, a first dichroic layer that transmits color light emitted from the first image modulation element and reflects light emitted from the first image modulation element, the first image modulation element, and the second And a second dichroic layer that transmits color light emitted from the image modulation element and reflects light emitted from the third image modulation element, and passes through the center of the image display surface and is perpendicular to the image display surface. Straight line Respect serial straight line perpendicular to the center of the street first entrance surface of the first entrance surface, it is preferable that the shift to the opposite side to the second incident surface.

  Further, among the plurality of image modulation elements, a first prism having a first incident surface on which light emitted from the first image modulation element is incident, and among the plurality of image modulation elements, the second image A second prism having a second incident surface on which light emitted from the modulation element is incident; and a third prism having a third incident surface on which light emitted from the third image modulation element is incident among the plurality of image modulation elements. Three prisms, a first dichroic layer that transmits color light emitted from the first image modulation element and reflects light emitted from the first image modulation element, the first image modulation element, and the second image modulation element. And a second dichroic layer that transmits color light emitted from the image modulation element and reflects light emitted from the third image modulation element, and passes through the center of the image display surface and is perpendicular to the image display surface. Straight line Respect serial straight line perpendicular to the center of the street first entrance surface of the first entrance surface, it is preferable that the shift in the same direction as the third incident surface.

  Here, the color synthesizing system has two dichroic mirror layers in the prism that have the surface that doubles as the total reflection surface and the transmission surface on the most exit side, and reflects light having different wavelength ranges. Each of the dichroic mirror layers preferably includes a color synthesis prism composed of at least three or more prisms that do not intersect inside the prism.

  With respect to at least one image modulation element among the plurality of image modulation elements, a straight line passing through the center of the incident surface on which light emitted from the at least one image modulation element is incident, and light incident on the incident surface It is preferable that a straight line that passes through the center of the image display surface of the image modulation element on which the light is incident and is perpendicular to the image display surface are shifted from each other in the color synthesis plane.

  Moreover, it is preferable that the F number of the illumination optical system in the short side direction of the image display surface of the image display device is larger than other directions.

  It is preferable to have a parabolic mirror that converts light from the light source into substantially parallel light, and a reflecting member that reflects at least part of the light emitted from the parabolic mirror toward the parabolic mirror.

  The image display device of the present invention illuminates the image modulation element with an image modulation element, a parabolic mirror for converting light emitted from the light source into substantially parallel light, and light emitted from the parabolic mirror. And a reflector that returns at least a part of the substantially parallel light emitted from the parabolic mirror to the vicinity of the light emitting point of the light source via the parabolic mirror. .

  An image display device of the present invention includes an image modulation element including a substantially rectangular image display surface, a parabolic mirror for converting light emitted from a light source into substantially parallel light, and a parabolic mirror from the parabolic mirror. An image display device comprising: an illumination optical system that illuminates the image modulation element with emitted light; and a reflector that returns at least part of the substantially parallel light emitted from the parabolic mirror to the parabolic mirror. The illumination optical system compresses the diameter of the light beam emitted from the parabolic mirror in the short side direction of the image display surface.

  An image display device of the present invention includes an image modulation element including a substantially rectangular image display surface, a parabolic mirror for converting light emitted from a light source into substantially parallel light, and a parabolic mirror from the parabolic mirror. An image display device comprising: an illumination optical system that illuminates the image modulation element with emitted light; and a reflector that returns at least part of the substantially parallel light emitted from the parabolic mirror to the parabolic mirror. The F number of the illumination optical system in the short side direction of the image display surface is darker than the other directions.

  Here, it is preferable that the illumination optical system compresses the diameter of the light beam emitted from the parabolic mirror in the short side direction of the image display surface. The reflector is preferably a corner cube reflector.

  Here, an image modulation element including a substantially rectangular image display surface, a parabolic mirror for converting light emitted from the light source into substantially parallel light, and a lens array having a shape substantially similar to the image display surface A first lens array plate formed in a matrix, a first cylindrical lens having a positive refractive power in the short side direction of the image display surface, and a negative refractive power in the short side direction of the image display surface. It is preferable to include a second cylindrical lens having a second lens array plate in which a plurality of lens arrays having a shape substantially similar to the image display surface are formed in a matrix.

  Here, it is preferable that the first lens array plate, the first cylindrical lens, the second cylindrical lens, and the second lens array plate are disposed in order from the light source side.

  Preferably, the first lens array plate and the first cylindrical lens, and the second cylindrical lens and the second lens array plate are integrally provided.

  In addition, it is preferable that the diameter of the light beam emitted from the second lens array plate is made smaller so that the F number of the illumination optical system in the short side direction of the image display surface of the image display element is darker than the other directions.

  In addition, the image display device of the present invention includes a plurality of image modulation elements having a substantially rectangular image display surface and a color separation system that separates light from a light source into a plurality of color lights, and each of the plurality of color lights uses the plurality of color lights. An image display device having an illumination optical system for illuminating an image display element, wherein a color separation direction for separating light from the light source into a plurality of color lights and a short side direction of the image display surface are substantially parallel to each other. It is characterized by being.

  According to the present invention, a small image display device can be realized by arranging an image modulation element so as to perform color synthesis in a vector plane parallel to the short side direction of the image display surface of the image modulation element. .

  Hereinafter, embodiments will be described in detail with reference to the drawings.

  FIG. 1 shows a sectional view in a vertical section of a projection type image display apparatus according to a first embodiment of the present invention.

  The white light emitted from the light source 1 is converted into substantially parallel light by the parabolic mirror 2, and the first fly-eye lens 4 in which a plurality of rectangular lens pieces are formed in a matrix is used. A light source image corresponding to the matrix of the lenses 4 is formed on the second fly-eye lens 5, and the second fly-eye lens 5 is arranged to project an image of the lens piece of the first fly-eye lens 4 on the liquid crystal panel side. Yes.

  FIG. 3 shows a bottom view of the projection type image display device shown in FIG. 1 as viewed from the lower side of the drawing (view of the image display device as viewed from the vertical direction). By the polarization separation film 6A of the polarization conversion element 6, FIG. The P-polarized light is transmitted, the S-polarized light is reflected, and the transmitted S-polarized light is converted into P-polarized light by the half-wave plate 6B. Therefore, the light that has passed through the polarization conversion element 6 becomes S-polarized light in a direction perpendicular to the paper surface in FIG. The light shielding plate 6 </ b> C is for preventing unnecessary light that is not polarized and converted from being incident on the polarization conversion element 6.

  Returning to FIG. 1, the light emitted from the polarization conversion element 6 is collected by the convex lens 7, the blue light is transmitted by the first dichroic mirror 8, and the green light and the red light are reflected.

  The blue light transmitted through the first dichroic mirror 8 is reflected by the reflecting mirror 9, converted into substantially parallel light by the convex lens 10, and illuminated on the image display surface 12 A of the image modulation element 12 through the polarizing plate 11. . Here, the short side direction of the image display surface 12A of the image modulation element 12 is substantially parallel to a color separation plane (a plane including optical paths of incident light, transmitted light, and reflected light) by the first dichroic mirror 8. . Similarly, the second dichroic mirror and the dichroic mirror layers DM1 and DM2 of the color synthesis prism, which will be described later, can be defined as a color separation plane and a color synthesis plane.

  The green light and red light reflected by the first dichroic mirror 1 are reflected by the second dichroic mirror, and the red light is transmitted. The green light reflected by the second dichroic mirror is converted into substantially parallel light by the convex lens 15 and is illuminated on the image display surface 17A of the image modulation element 17 via the polarizing plate 16. Here, the short-side direction of the image display surface 17A is substantially parallel to the color separation plane of the second dichroic mirror 14.

  The red light that has passed through the second dichroic mirror is converted into substantially parallel light through the convex lens 19, the reflective mirror 20, the convex lens 21, the reflective mirror 22, and the positive lens 23, and then through the polarizing plate 24 to the image modulation element 25. The image display surface 25A is illuminated. By the convex lenses 19, 20, and 21, a rectangular red light image formed near the convex lens 19 is formed on the image display element surface 25A at approximately the same magnification. Triangular prisms 27 and 28 having dichroic mirror layers DM1 and DM2 that reflect light in two different wavelength ranges for the blue light, green light, and red light modulated by the image modulation elements 12, 17, and 25, respectively. , 29, the three colors are combined and projected onto a screen (not shown) via the projection lens 30.

  More specifically, the blue light modulated by the image modulation element 12 is incident on the triangular prism 28, reflected by the dichroic mirror layer DM2 that reflects the blue light and transmits the green light, and enters the projection lens 30. The green light modulated by the image modulation element 17 enters the triangular prism 29, reflects blue light, passes through the dichroic mirror layer DM2 that transmits green light, reflects red light, and reflects blue light and green light. The light passes through the transmitting dichroic mirror layer DM1 and enters the projection lens 30. The red light modulated by the image modulation element 25 is incident on the triangular prism 27, is totally reflected by the surface 27A, reflects the red light, and is reflected by the dichroic mirror layer DM1 that transmits the blue light and the green light. 30 is incident.

  Here, the color synthesis planes of the dichroic mirror layers DM1 and DM2 are substantially the same plane, and the color synthesis plane includes the short side direction of the image modulation display surface 12A, the short side direction of the image display surface 17A, and the image display. The surface 25A is substantially parallel to the short side direction, and by configuring in this way, the light flux width in the color synthesis surface can be narrowed, and the size of the entire device in the color synthesis surface can be reduced. The whole device is downsized.

  FIG. 7 shows details of a cross-sectional view of the color synthesis projection optical system of FIG.

  With respect to the center line PCL (the line passing through the center of the incident surface of the triangular prism 29 and perpendicular to the incident surface of the triangular prism 29) in the plane of the plane of incidence of the triangular prism 29 (direction included in the sheet). The center line CL (the line passing through the center of the image display surface and perpendicular to the image display surface) of the image modulation element 17 is shifted to the upper side of the paper (the incident surface side of the triangular prism 27). As described above, the image modulation element 17 is arranged.

  A distance L1 from the upper end of the incident surface of the triangular prism 29 (the end of the incident surface of the triangular prism 29 closest to the incident surface of the triangular prism 27) to the center in the short side direction of the image display unit 17A of the image modulation element 17; When comparing the distance L2 from the lower end of the triangular prism prism 29 to the center of the image display unit 17A in the short side direction of the image modulation element 17, the image modulation element is arranged such that L2 is larger than L1. With such an arrangement, the color UL of the light beam UL emitted from the image display surface of the image modulation element 17 to the upper left side of the paper and the light beam DL emitted to the lower left side of the paper can be generated without causing vignetting. The composite prism can be downsized. The light beam UL emitted from the image display surface of the image modulation element 17 to the upper left side of the paper surface and the light beam DL emitted to the lower left side of the paper surface are such that the light beam DL intersects the light beam UL and the light beam DL at the prism end surface. Since the image modulation element 17 is far from the image display portion 17A, the center line CL in the paper surface direction of the image display portion 17A may be arranged above the center line in the paper surface direction of the incident surface 29A of the triangular prism 29. It is preferable for reducing the size of the color synthesis prism.

  Here, if the position of the image modulation element 12 or the orientation of the triangular prism 29 (posture, azimuth angle with respect to the central line PCL of the triangular prism 29) changes, the center line of the incident surface of the triangular prism 29 on the center line CL of the image display surface. The shift direction with respect to PCL changes. That is, the center line CL of the image display surface 17A has a surface in contact with one surface of the triangular prism 29 with respect to the center line PCL of the incident surface of the triangular prism 29 on which light emitted from the image display surface 17A is incident. It is preferable that the triangular prism 28 is disposed so as to shift to the opposite side to the direction in which the image modulation element 12 including the image display surface 12A on which the emitted light enters the triangular prism 28. Here, the center line CL of the image display surface 17 </ b> A is arranged on the opposite side to the arrangement position of the image modulation element 12 with respect to the center line PCL of the incident surface of the triangular prism 29.

  In this way, color synthesis (and color separation) is performed in the short side direction of the display surface of the image modulation element, and the center of the image display unit of the image modulation element is located above the center of the incident surface in the transmission light path of the color synthesis prism. Is shifted to the entrance surface side of the prism on the most exit side, so that the light beam diameter in the color composition plane of the light beam toward the color composition prism is made smaller than when color composition (color separation) is performed in the long side direction of the display surface. Therefore, the size of the color synthesis prism can be reduced.

  In FIG. 1, the light emitted from the light source 1 to the periphery of the parabolic reflector 2 is returned to the light source 1 by the corner cube-shaped reflector 3, reflected again by the parabolic reflector 2, 1 enters the fly eye 4. By adopting such a configuration, the light beam diameter in the paper direction in FIG. 1 (light beam diameter in the color separation plane or light beam diameter in the color composition plane) is reduced (compressed) without substantially impairing the illumination efficiency. It becomes possible.

  The reflecting plate 3 has a corner cube shape. In the case of a flat reflecting plate, when light that is not parallel to the optical axis of the illumination optical system is incident on the reflecting plate, the light can be accurately returned to the light source position. There is a problem that lighting efficiency is not so high. However, if a corner cube-shaped reflector is used, light can be returned to the parabolic reflector 2 at the angle incident on the reflector, so that the light reflected by the reflector can be accurately used as a light source. This is because the lighting efficiency can be improved.

  With this configuration, the F-number of the illumination optical system in the direction of the paper in FIG. 1 can be made darker than the direction of the paper in FIG. 3 (direction in the color synthesis plane, direction in the color separation plane). Since the spread of the light beam emitted from the light source is further reduced, the color synthesis prism can be further reduced in size.

  In the plane of FIG. 1 (color separation plane or color synthesis plane), color separation and color synthesis are performed in the same plane direction as the short side direction, which is parallel to the short side direction of the image display unit of the image modulation element. As a result, the dichroic mirror and the color combining prism for color separation can be reduced in size by the length of the display portion of the image display element being shorter than the long side direction. If the color combining prism can be miniaturized, the back focus of the projection lens can be shortened, which is advantageous for miniaturization of the projection lens, and as a whole, a small projection type image device can be realized.

  FIG. 2 shows a front view of FIG. As shown in FIG. 2, the image display section of the image modulation element is a horizontally long rectangle when viewed from the front. The reflector 3 is arranged in the vertical direction of the paper, and compresses the diameter of the light beam emitted from the vertical reflecting mirror.

  FIG. 4 is a sectional view of a projection type image display apparatus according to the second embodiment of the present invention. The parts that are not described are the same as those in the first embodiment.

  White light emitted from the light source 1 is converted into substantially parallel light by the parabolic mirror 2, and a light source image corresponding to the matrix of the first fly-eye lens 31 is converted by the first fly-eye lens 31 into the second fly-eye lens 31. The second fly-eye lens 32 formed on the eye lens 32 is disposed so as to project an image of the lens piece of the first fly-eye lens 31 on the liquid crystal panel side.

  Here, a cylindrical lens shape having a positive refractive power only in the direction parallel to the paper surface of FIG. 4 is formed on the lens surface of the first fly-eye lens 31 on the image modulation element side. The lens surface on the light source side is formed with a cylindrical lens shape having a negative refractive power only in the direction parallel to the paper surface of FIG. 4, and the light emitted from the reflecting mirror 2 is compressed in the direction parallel to the paper surface of FIG. It is configured to be.

  With such a configuration, the F number in the direction parallel to the paper surface of FIG. 4 is made darker than the direction perpendicular to the paper surface (the paper surface direction of FIG. 5), thereby suppressing the spread of the light flux in the direction parallel to the paper surface of FIG. The downsizing of the illumination optical system and the color synthesis prism in the direction parallel to the paper surface of FIG. 4 is realized.

  FIG. 6 is a bottom view of FIG. 1 as viewed from the lower side of the drawing. The polarization separation film 6A of the polarization conversion element 6 transmits P-polarized light and reflects S-polarized light. It is converted into P-polarized light by 6B. Therefore, the light that has passed through the polarization conversion element 6 becomes S-polarized light in the direction perpendicular to the paper surface in FIG. The light shielding plate 6 </ b> C is for preventing unnecessary light that is not polarized and converted from being incident on the polarization conversion element 6.

  Returning to FIG. 4, the light emitted from the polarization conversion element 6 is collected by the convex lens 7, the blue light is transmitted by the first dichroic mirror 8, and the green light and the red light are reflected. The blue light transmitted through the first dichroic mirror 8 is reflected by the reflecting mirror 9, converted into substantially parallel light by the convex lens 10, and illuminated on the image display surface 12 A of the image modulation element 12 through the polarizing plate 11. .

  The green light and red light reflected by the first dichroic mirror 1 are reflected by the second dichroic mirror, and the red light is transmitted. The green light reflected by the second dichroic mirror is converted into substantially parallel light by the convex lens 15 and is illuminated on the image display surface 17A of the image modulation element 17 via the polarizing plate 16.

  The red light that has passed through the second dichroic mirror is converted into substantially parallel light through the convex lens 19, the reflective mirror 20, the convex lens 21, the reflective mirror 22, and the positive lens 23, and then through the polarizing plate 24 to the image modulation element 25. The image display surface 25A is illuminated. By the convex lenses 19, 20, and 21, a rectangular red light image formed near the convex lens 19 is formed on the image display element surface 25A at approximately the same magnification. The blue light, the green light, and the red light modulated by the image modulation elements 12, 17, and 25 have dichroic mirror layers DM1 and DM2 that reflect light in two different wavelength ranges, and four triangular prisms 33, Three colors are synthesized by a color synthesizing prism constituted by 34, 35, and 36, and projected onto a screen (not shown) via the projection lens 30. The reason why the prism is composed of four prisms with respect to the color synthesizing prism in FIG. 1 is to further reduce the size of the color synthesizing prism. By dividing the prism disposed between the dichroic mirror layers DM1 and DM2 into two, it is possible to reduce the size without generating vignetting by the prisms of the light rays UL and DL emitted from the image display unit 17A of the image modulation element 17. Has been realized.

  By dividing the prism disposed between the dichroic mirror layers DM1 and DM2, the light beam UL emitted from the image display unit 17A of the image modulation element 17 to the upper left side of the paper surface and the light beam emitted to the lower left side of the paper surface. Since the position where DL and the end face of the prism are in contact with each other can be made equal from the upper and lower sides from the image display unit 17A of the image modulation element 17, the size of the incident surface of the prism of the triangular prism 35 can be made smaller than the incident surface of the triangular prism 29 of FIG. It was.

  The paper surface direction in FIG. 4 is parallel to the short side direction of the image display unit of the image modulation element, and the length of the display unit of the image display element is long by performing color separation and color synthesis in the short side direction. The dichroic mirror and color composition prism for color separation can be reduced in size by being shorter than the direction. If the color combining prism can be miniaturized, the back focus of the projection lens can be shortened, which is advantageous for miniaturization of the projection lens, and as a whole, a small projection type image device can be realized.

  FIG. 5 shows a front view of FIG. As shown in FIG. 5, the image display section of the image modulation element is a horizontally long rectangle when viewed from the front.

  Further, the color combining prism used in the present embodiment is composed of three triangular prisms, but may be a quadrangular prism, a pentagonal prism, or the like, or a triangular prism that is chamfered. Absent. Further, a cross dichroic prism may be used.

Sectional drawing of the projection type image display apparatus of 1st Example of this invention (the short side direction of an image modulation element) The front view of the projection type image display apparatus of 1st Example of this invention The bottom view of the projection type image display apparatus of 1st Example of this invention Sectional drawing of the projection type image display apparatus of 2nd Example of this invention (short side direction of an image modulation element) The front view of the projection type image display apparatus of 2nd Example of this invention The bottom view of the projection type image display apparatus of 2nd Example of this invention Sectional drawing of the projection system part of the projection type image display apparatus of 1st Example of this invention (short side direction of an image modulation element)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 2 Parabolic mirror 3 Reflector 4, 31 1st fly eye 5, 32 2nd fly eye 6 Polarization conversion element 7, 10, 15, 19, 21, 23 Convex lens 8 1st dichroic mirror 9 Reflection mirror 11, 13, 16, 18, 24, 26 Polarizing plate 12, 17, 25 Image modulation element 14 Second dichroic mirror 27, 28, 29, 33, 34, 35, 36 Triangular prism 30 Projection lens

Claims (19)

A plurality of image modulation elements having a substantially rectangular image display surface; and a color composition system for color-combining a plurality of color lights emitted from the plurality of image modulation elements. An image display device having a projection optical system for projecting onto
An image display device, wherein a color composition direction when color-combining a plurality of color lights emitted from the plurality of image modulation elements is substantially parallel to a short side direction of the image display surface. The color synthesis system includes two dichroic layers, and has a color synthesis prism that synthesizes a plurality of color lights emitted from the plurality of image modulation elements,
The image display apparatus according to claim 1, wherein the two dichroic layers do not intersect each other. The color composition system has a plurality of incident surfaces on which a plurality of color lights emitted from the plurality of image modulation elements are incident, and has a color composition prism that color-synthesizes the plurality of color lights.
The plurality of incident light beams that pass through the center of the first image display surface of the plurality of image display surfaces and that are perpendicular to the first image display surface are incident on the light emitted from the first image display surface. The image display device according to claim 1, wherein the image display device is shifted with respect to a straight line that passes through the center of the first incident surface of the surfaces and is perpendicular to the first incident surface. The color composition system has a plurality of incident surfaces on which a plurality of color lights emitted from the plurality of image modulation elements are incident, and has a color composition prism that color-synthesizes the plurality of color lights.
The plurality of incident surfaces are arranged on different prisms, respectively.
Of the plurality of incident surfaces, a surface on which light emitted from the first image display surface of the plurality of image display surfaces is incident is a first incident surface,
When the surface on which light enters from the second image display surface among the surfaces of the prism adjacent to the prism having the first incident surface is the second incident surface,
A straight line passing through the center of the first image display surface and perpendicular to the first image display surface is a straight line passing through the center of the first incident surface and perpendicular to the first incident surface. 4. The image display device according to claim 1, wherein the image display device is shifted to the opposite side. A first prism having a first incident surface on which light emitted from the first image modulation element is incident among the plurality of image modulation elements;
A second prism having a second incident surface on which light emitted from the second image modulation element is incident among the plurality of image modulation elements;
A third prism having a third incident surface on which light emitted from the third image modulation element is incident among the plurality of image modulation elements;
A first dichroic layer that transmits the color light emitted from the first image modulation element and reflects the light emitted from the first image modulation element;
A second dichroic layer that transmits the color light emitted from the first image modulation element and the second image modulation element and reflects the light emitted from the third image modulation element;
A straight line passing through the center of the image display surface and perpendicular to the image display surface is shifted to the opposite side of the second entrance surface with respect to a straight line passing through the center of the first entrance surface and perpendicular to the first entrance surface. The image display device according to claim 1, wherein the image display device is an image display device. A first prism having a first incident surface on which light emitted from the first image modulation element is incident among the plurality of image modulation elements;
A second prism having a second incident surface on which light emitted from the second image modulation element is incident among the plurality of image modulation elements;
A third prism having a third incident surface on which light emitted from the third image modulation element is incident among the plurality of image modulation elements;
A first dichroic layer that transmits the color light emitted from the first image modulation element and reflects the light emitted from the first image modulation element;
A second dichroic layer that transmits the color light emitted from the first image modulation element and the second image modulation element and reflects the light emitted from the third image modulation element;
A straight line passing through the center of the image display surface and perpendicular to the image display surface is shifted in the same direction as the third entrance surface with respect to a straight line passing through the center of the first entrance surface and perpendicular to the first entrance surface. The image display device according to claim 1, wherein the image display device is an image display device.   The color synthesizing system has two dichroic mirror layers in the prism, the two dichroic mirror layers having the surface which serves as the total reflection surface and the transmission surface on the most exit side and reflecting light having different wavelength ranges from each other. The image display device according to claim 1, wherein the layer includes a color synthesis prism including at least three prisms that do not intersect inside the prism. Regarding at least one of the plurality of image modulation elements,
A straight line that passes through the center of the incident surface on which light emitted from the at least one image modulation element is incident and is perpendicular to the incident surface, and the center in the short side direction of the image display surface of the image modulation element that causes light to enter the incident surface The image display device according to claim 1, wherein a straight line that passes through the image display surface and is perpendicular to the image display surface is shifted in the color synthesis plane.   9. The image display device according to claim 1, wherein an F number of an illumination optical system in a short side direction of the image display surface of the image display device is larger than other directions.   A parabolic mirror that converts light from the light source into substantially parallel light; and a reflecting member that reflects at least a part of the light emitted from the parabolic mirror toward the parabolic mirror. The image display device according to claim 1.   An image modulation element, a parabolic mirror for converting light emitted from the light source into substantially parallel light, an illumination optical system that illuminates the image modulation element with light emitted from the parabolic mirror, and the paraboloid An image display device comprising: a reflecting plate that returns at least a part of the substantially parallel light emitted from a mirror to the vicinity of a light emitting point of the light source through the parabolic mirror. An image modulation element including a substantially rectangular image display surface, a parabolic mirror for converting light emitted from a light source into substantially parallel light, and illuminating the image modulation element with light emitted from the parabolic mirror An image display device comprising: an illumination optical system; and a reflector that returns at least a part of the substantially parallel light emitted from the parabolic mirror to the parabolic mirror,
The image display device, wherein the illumination optical system compresses a diameter of a light beam emitted from the parabolic mirror in a short side direction of the image display surface. An image modulation element including a substantially rectangular image display surface, a parabolic mirror for converting light emitted from a light source into substantially parallel light, and illuminating the image modulation element with light emitted from the parabolic mirror An image display device comprising: an illumination optical system; and a reflector that returns at least a part of the substantially parallel light emitted from the parabolic mirror to the parabolic mirror,
An image display device characterized in that the F-number of the illumination optical system in the short side direction of the image display surface is darker than other directions.   The image display apparatus according to claim 13, wherein the illumination optical system compresses a diameter of a light beam emitted from the parabolic mirror in a short side direction of the image display surface.   15. The image display device according to claim 10, wherein the reflecting plate is a corner cube-shaped reflecting plate.   An image modulation element including a substantially rectangular image display surface, a parabolic mirror for converting light emitted from a light source into substantially parallel light, and a plurality of lens arrays having a shape substantially similar to the image display surface A first lens array plate formed in a matrix, a first cylindrical lens having a positive refractive power in the short side direction of the image display surface, and a second having a negative refractive power in the short side direction of the image display surface. 16. The image according to claim 1, further comprising: a cylindrical lens; and a second lens array plate in which a plurality of lens arrays having a shape substantially similar to the image display surface are formed in a matrix. Display device.   The image display apparatus according to claim 16, wherein the first lens array plate, the first cylindrical lens, the second cylindrical lens, and the second lens array plate are disposed in order from the light source side.   18. The image display device according to claim 16, wherein the first lens array plate and the first cylindrical lens, and the second cylindrical lens and the second lens array plate are integrally provided. A plurality of image modulation elements having a substantially rectangular image display surface; and an illumination optical system that illuminates the plurality of image display elements with each color light, including a color separation system that separates light from a light source into a plurality of color lights. An image display device comprising:
An image display device, wherein a color separation direction for separating light from the light source into a plurality of color lights and a short side direction of the image display surface are substantially parallel.

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