JP2006039240A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device that can obtain a projection display image in which nonuniform illuminance is reduced, while making the size of the device small. <P>SOLUTION: The image display device includes: a light source 10; a filter 11 for shading a luminous flux other than visible light among light fluxes from the light source 10; an optical integrator 12 for forming multiple light sources composed of a plurality of light source images, on the basis of the luminous flux from the light source 10; lenses 14-1 to 14-6 and mirrors 16-1 to 16-4 for condensing luminous fluxes from the multiple light source formed by the optical integrator 12, thereby illuminating an illumination surface with light in a superposing manner; and a cross mirror 15 composed including a cross section 40 so as to branch a luminous flux from the lens 14-1. In addition, a light-reducing member 13 for reducing light entering the cross section 40 of the cross mirror 15 is disposed between the light source 10 and the cross mirror 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image display apparatus that projects and displays an image, and more particularly to an image display apparatus that obtains a color image by combining a plurality of color image lights formed using a plurality of light modulation panels.

Conventionally, three-plate liquid crystal projectors that form three color image light based on illumination light using a liquid crystal display panel for each color of RGB, generate a color image by combining these image lights, and project and display them are widely used. is doing. In this type of three-plate liquid crystal projector, it is necessary to branch the optical path of the illumination light beam depending on the wavelength. As a method therefor, for example, as disclosed in Patent Document 1, a plurality of wavelength-selective flat mirrors and prisms are arranged independently in the illumination optical path without crossing each other (first method). There is. This method is widely used because flat mirrors and prisms can be easily manufactured and the manufacturing cost is low.
JP-A-7-301778

  However, in the first method, it is necessary to separately arrange a plurality of flat mirrors and prisms in a straight optical path from the light source, so that not only a wide arrangement space is required, but there is no flexibility in arrangement. Further, since the optical system is enlarged, it is difficult to reduce the size of the projector.

  Therefore, a method (second method) using a cross mirror or a cross prism instead of the flat plate mirror or prism has been proposed. This cross mirror is configured such that two mirrors having different wavelength selectivity cross each other. The cross prism is configured by bonding a plurality of prisms to each other and forming optical thin films having different wavelength selectivity on each bonding surface.

  Since the functions of a plurality of flat mirrors and prisms can be realized by a single cross mirror or cross prism, this second method requires not only a small arrangement space but also an arrangement. There is also flexibility. Further, since the optical system is downsized, the projector can be easily downsized.

  However, since the cross mirror and cross prism used in the second method are usually configured by joining a plurality of mirrors and prisms to each other, a slight gap in the connecting portion (intersection) or a rough polishing degree is required. Due to the surface or the like, striped uneven illuminance occurs on the irradiated surface (here, a liquid crystal display panel). For this reason, unevenness in illuminance occurs in the finally obtained projected display image, and the image quality may be deteriorated. That is, when a cross mirror or a cross prism is employed, the apparatus can be reduced in size, but it is difficult to obtain a projected display image with little illuminance unevenness.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an image display device capable of obtaining a projected display image with less uneven illuminance while reducing the size of the device. .

  An image display apparatus according to the present invention includes a light source unit, a first dimming unit for dimming a light beam outside the visible light region out of a light beam from the light source unit, and a plurality of light source images based on the light beam from the light source unit. An optical integrator for forming a multi-light source, a condenser optical system for condensing a light beam from the multi-light source formed by the optical integrator to illuminate the irradiated surface, and a light beam of the condenser optical system An optical path branching unit configured to include an intersection so as to branch, an image display unit arranged on the irradiated surface, a projection optical system for projecting an image formed by the image display unit, an optical path branching unit, and a light source And a second dimming means for dimming light incident on the intersection of the optical path branching means.

  In the image display device of the present invention, the light incident on the intersecting portion of the optical path branching means is attenuated by the second dimming means. It is possible to suppress the occurrence of uneven illuminance on the irradiated surface, and uneven illuminance hardly occurs in the finally obtained projected display image. Here, it is preferable that the surface (secondary light source surface) including the multiple light sources formed by the optical integrator is disposed at a position conjugate to the entrance pupil of the projection optical system. It should be noted that “arranged at the position of the plane conjugate with the entrance pupil” does not necessarily mean that it is arranged strictly at the position of the plane conjugate with the entrance pupil. In addition, examples of the optical path branching means having an intersecting portion include a cross mirror or a cross prism. “Light reduction” includes “light shielding” that reduces light by 100%.

  According to the image display device of the present invention, an optical integrator that divides a light beam from a light source unit into a plurality of light beams to form a multi-light source, and condenses the light beams from the multi-light source to illuminate an irradiated surface in a superimposed manner. A condenser optical system, and an optical path branching unit configured to include a crossing portion so that the light beam emitted from the condenser optical system can be branched into a plurality of optical paths, and light incident on the crossing part of the optical path branching unit Since the second dimming means for dimming is provided between the optical path branching means and the light source means, it is possible to suppress the occurrence of striped illuminance unevenness due to the intersecting portion on the irradiated surface, As a result, a projected display image with little illuminance unevenness can be obtained. Moreover, as a means for branching the optical path of the emitted light beam from the condenser optical system into a plurality of optical paths, a single optical path branching means including an intersection is used, so that the apparatus can be downsized and the optical system can be freely arranged. It is also possible to improve the degree.

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

  1 to 2 show a schematic configuration of an image display apparatus according to an embodiment of the present invention. Specifically, FIG. 1 shows a planar configuration of the entire image display apparatus, and FIG. 2 shows a main part planar structure of the image display apparatus. In this embodiment, a three-plate liquid crystal projector is described as an example of the image display device.

  The optical system of the three-plate liquid crystal projector (hereinafter simply referred to as a projector) includes an illumination optical system 1, liquid crystal display elements (LCD (Liquid Crystal Display)) 2R, 2G, and 2B as image display means, and a projection optical system. 3 is provided. The illumination optical system 1 includes a light source 10 as a light source means, a filter 11 as a first dimming means, an optical integrator 12, a dimming member 13 as a second dimming means, lenses 14-1 to 14-6, The cross mirror 15 which is an optical path branching unit and mirrors 16-1 to 16-4 are included. The projection optical system 2 includes a cross prism 30 and a projection lens 31. The lenses 14-1 to 14-6 constitute a part of the condenser optical system together with the mirrors 16-1 to 16-4.

  Each element which comprises the illumination optical system 1 is arrange | positioned as follows. The light source 10, the filter 11, the optical integrator 12, the dimming member 13, the lens 14-1, the cross mirror 15, and the lens 14-5 are arranged along the optical axis AX so that their optical axes coincide with the optical axis AX. They are arranged sequentially. The mirrors 16-1 and 16-3 are arranged side by side with the cross mirror 15 at positions separated from each other in the opposite directions around the optical axis AX. The reflecting surfaces of the mirrors 16-1 and 16-3 are inclined by ± 45 degrees with respect to the optical axis AX, and light beams reflected by the cross mirror 15 and traveling in a direction perpendicular to the optical axis AX are respectively reflected by light. It reflects in the direction parallel to the axis. The lenses 14-2 and 14-3 are disposed on the optical paths of the light beams reflected by the mirrors 16-1 and 16-3, respectively. The mirrors 16-2 and 16-4 are respectively arranged behind the lenses 14-2 and 14-3 (in the traveling direction of the light beam) so that the reflecting surface is inclined by ± 45 degrees with respect to the optical axis AX. Each light beam transmitted through −2, 14-3 is arranged on the optical path of each light beam reflected in the direction of the optical axis AX.

  The cross prism 30 and the projection lens 31 constituting the projection optical system 3 are sequentially arranged behind the lens 14-5 along the optical axis AX so that these optical axes coincide with the optical axis AX. Further, the cross prism 30 is disposed so as to be sandwiched between the lens 14-4 and the lens 14-6.

  Of the three LCDs, the LCD 2R for R is disposed between the lens 14-4 and the cross prism 30, and the LCD 2G for G is disposed between the lens 14-5 and the cross prism 30, and B LCD 2 </ b> B is disposed between the lens 14-6 and the cross prism 30.

  The light source 10 includes, for example, a white light source lamp and a reflecting mirror, and supplies a light beam for irradiating the LCDs 2R, 2G, and 2B that are irradiated surfaces.

  The filter 11 is formed of, for example, an interference filter having a multilayer film structure, and attenuates light beams other than visible light among the light beams from the light source 10.

  The optical integrator 12 is configured using a lens array. Specifically, the first lens array 12A including a plurality of lenses arranged in a predetermined arrangement state (here, a 3 × 3 matrix) and each lens of the first lens array 12A correspond to each other. And a second lens array 12B including a plurality of lenses arranged in this manner. The light beams divided and formed by the first and second lens arrays 12A and 12B are focused on the vicinity of the image-side lens surface of the second lens array 12B, and a secondary light source surface C is formed here. ing. This secondary light source surface C is located at a position conjugate to the entrance pupil of the projection optical system 3. However, the secondary light source surface C does not necessarily have to be strictly located at a position conjugate to the entrance pupil of the projection optical system 3, and may be located within a design allowable range.

  The optical integrator 12 having such a configuration has a function of uniforming the illuminance distribution on the irradiated surface (LCD 2R, 2G, 2B). In general, the emitted light beam from the light source 10 has a non-uniform intensity distribution in a plane perpendicular to the traveling direction thereof. If the emitted light beam is directly guided to the irradiated surface, the illuminance distribution on the irradiated surface becomes non-uniform. However, if the light beam emitted from the light source 10 is divided into a plurality of light beams by the optical integrator 12 as described above and each of the light beams is superimposed on the irradiated surface, the illuminance distribution on the irradiated surface becomes uniform. be able to.

  The light reducing member 13 is configured by using a plate-like member such as a glass plate, for example. A central region 13A through which the optical axis AX passes is opaque or translucent, and the other regions are transparent. This central area 13A is a band-shaped area whose longitudinal direction is the direction orthogonal to the paper surface in FIG. 1 (the Y direction in FIG. 2). However, it is also possible to use a non-translucent or semi-transparent belt-like plate material. The light reducing film is a concept including a light shielding film that blocks 100% of visible light transmission. In the following description, the central area 13A is referred to as a dimming area 13A.

  The dimming member 13 having such a configuration is disposed at the position of the secondary light source surface C, and dimmes a light beam incident on an intersecting portion 40 (described later) of the cross mirror 15. However, the dimming member 13 does not necessarily have to be strictly disposed at the position of the secondary light source surface C, and may be disposed within a design allowable range. Note that not only the light beam incident on the intersecting portion 40 of the cross mirror 15 but also the light beam passing through the vicinity of the intersecting portion 40 may be attenuated by the dimming region 13 </ b> A of the dimming member 13. However, if more light flux than necessary is dimmed, the illuminance on the surface to be irradiated is reduced. Therefore, it is preferable that only the light flux incident on the intersecting portion 40 of the cross mirror 15 is dimmed.

  The cross mirror 15 is configured by connecting two mirrors 15G and 15B having different wavelength selectivity so as to cross each other. The cross mirror 15 is arranged such that the extending direction of the portion where the mirrors 15G and 15B intersect with each other (hereinafter simply referred to as the intersecting portion 40) is the direction Y perpendicular to the paper surface. Here, the mirrors 15G and 15B are configured, for example, by depositing a multilayer interference film on a glass plate. The two mirrors 15G and 15B in the present embodiment correspond to a specific example of “a plurality of optical components” of the present invention. The cross mirror 15 having such a configuration branches the optical path of the light beam transmitted through the dimming member 13 into three optical paths according to the R, G, and B wavelength components.

  The mirrors 16-1 to 16-4 reflect the light beams branched by the cross mirror 15 for each wavelength.

  The lenses 14-1 to 14-6 constitute the main part of the condenser optical system as described above. The lenses 14-1, 14-2, and 14-4 are configured to superimpose and illuminate the LCD 2 </ b> R that is an irradiated surface by guiding R light among the light beams emitted from the multiple light sources formed by the optical integrator 12. . Similarly, the lenses 14-1, 14-3, and 14-6 guide the B light to guide the LCD 2B, and the lenses 14-1 and 14-5 guide the G light to superimpose the LCD 2G.

  The LCDs 2R, 2G, and 2B are transmissive LCDs that are modulated with color image signals corresponding to the R, G, and B wavelength components, respectively. The LCD 2 </ b> R modulates incident R wavelength component illumination light based on the R image signal to generate R image light, and the R image light is incident on the cross prism 30. The LCD 2G modulates incident G wavelength component illumination light based on the G image signal to generate G image light, and the G image light is incident on the cross prism 30. The LCD 2 </ b> B modulates incident B wavelength component illumination light based on the B image signal to generate B image light, and the B image light is incident on the cross prism 30.

  The cross prism 30 is configured by joining four prisms. Two selective reflection surfaces SR and SB having different wavelength selectivity are formed on the joint surfaces of these prisms by a multilayer interference film or the like. The selective reflection surface SR reflects the R image light emitted from the LCD 2R in the direction parallel to the optical axis AX and guides it in the direction of the projection lens 31, and the selective reflection surface SB transmits the B image light emitted from the LCD 2B to the optical axis AX. Is reflected in a direction parallel to the projection lens 31 and guided to the direction of the projection lens 31. The G image light emitted from the LCD 2G passes through the selective reflection surfaces SR and SB and proceeds in the direction of the projection lens 31. Eventually, the cross prism 30 functions to generate color image light by combining the G, B, and R image lights generated by the LCDs 2G, 2B, and 2R and to enter the projection lens 31, respectively.

  The projection lens 31 includes a plurality of lenses and the like, and projects the color image light emitted from the cross prism 30 onto a screen (not shown) to display an image.

  Next, with reference to FIGS. 1-2, the effect | action of the image display apparatus of the above structures is demonstrated.

  First, the overall operation will be described with reference to FIG. The white light emitted from the light source 10 passes through the filter 11 and is limited to a visible light beam, and then is divided into a plurality of light beams by the optical integrator 12. The divided light beam passes through the light reducing member 13, and is then split by the cross mirror 15 into a light beam composed of R, G, and B wavelength components and branched into three optical paths.

  Of the RGB light fluxes branched in the optical path, the G light passes through the lens 14-1, the cross mirror 15, and the lens 14-5 to illuminate the LCD 2G. The R light passes through the lens 14-1, is reflected by the cross mirror 15, is reflected by the mirror 16-1, is reflected by the lens 14-2, is reflected by the mirror 16-2, and is superimposed on the LCD 2R through the lens 14-4. Illuminate. The B light passes through the lens 14-1, is reflected by the cross mirror 15, is reflected by the mirror 16-3, is reflected by the lens 14-3, is reflected by the mirror 16-4, and is superimposed on the LCD 2B through the lens 14-6. Illuminate. The light beams incident on the LCD 2R, LCD 2G, and LCD 2B in this way are respectively modulated when transmitted through the LCDs 2R, 2G, and 2B, and converted into R, G, and B image lights. These image lights are combined by the cross prism 30. The synthesized color image light is projected onto a screen (not shown) by the projection lens 31, thereby displaying an image.

  Next, with reference to FIG. 3, the characteristic action regarding the light reducing member 13 will be described in detail. Here, in order to simplify the description, it is assumed that the dimming region 13A of the dimming member 13 is configured to shield the incident light flux by 100%.

  FIG. 3 shows the lenses of the second lens array 12B that are numbered 1-9. In addition, the code | symbol of each lens shall be shown like 12B1, ... 12B9 in the following text.

  Description will be made by paying attention to G light. Light beams that have passed through the lenses 12B1 to 12B and 12B7 to 9 in the lens array 12B pass through a transmission region other than the light reduction region 13A of the light reduction member 13, and are superimposed on the LCD 2G by the lenses 14-1 and 14-5. Illuminate. At this time, the focal lengths of the lens arrays 12A and 12B and the position of the cross mirror 15 are appropriately designed so that the light beams that have passed through the lenses 12B1 to 12B and 12B7 to 9 do not pass through the intersecting portion 40 of the cross mirror 15. Shall. The light beam that has passed through the lenses 12B4 to 6B in the lens array 12B reaches the dimming region 13A and is therefore completely shielded from light and does not contribute to the subsequent optical system.

  Incidentally, the dimming region 13A of the dimming member 13 needs to have a size (width in the X direction) that can block all the light beams that have passed through the lenses 12B4 to 6B. If the light beam that has passed through the lenses 12B4 to 12B is too small in the light-reducing area 13A of the light-reducing member 13 and leaks through the light-reducing member 13 without being locally blocked, the light beam that has passed through the LCD 2R This is because the illuminance distribution becomes uneven on the other hand. On the other hand, when the dimming region 13A of the dimming member 13 is too large to block a part of the light beam passing through the lenses 12B1 to 12 and the lenses 12B7 to 9, the light velocity that is locally blocked is the surface of the LCD 2R. This is because the illuminance distribution becomes uneven on the contrary.

  Here, a comparative example with respect to the present embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 shows a main part of an image display device as a comparative example that does not include the light reducing member 13, and FIG. 5 schematically shows an illuminance distribution on the irradiated surface in the image display device shown in FIG. In FIG. 4, elements corresponding to the elements illustrated in FIG. 3 are denoted by reference numerals obtained by adding “100” to the reference numerals used in FIG. 3, and description thereof will be omitted as appropriate.

  In the comparative example shown in FIG. 4, since the light reducing member 13 is not provided in the optical path, the light beam that has passed through the lenses 12B4 to 6 passes through the intersection 140 of the cross mirror 115 through the central portion of the light beam. As a result, the amount of light that has passed through the lenses 12B4 to 12B decreases due to the polishing accuracy of the intersecting portions and the gap between the combinations, and the illuminance of the central strip portion on the LCD decreases. generate.

  On the other hand, in the image display device according to the present embodiment, as described above, in the configuration in which the optical paths of a plurality of light beams are branched in an appropriate wavelength region using the cross mirror 15, Since the incident light beam is shielded in advance (before entering the cross mirror 15), it is possible to avoid the occurrence of striped illuminance unevenness on the irradiated surface of the LCD 2G due to the intersecting portion 40 of the cross mirror 15 It is possible to obtain a projected display image with little illuminance unevenness. In addition, since a single cross mirror 15 is used instead of a configuration in which a plurality of independent mirrors are arranged as the optical path branching means, it is possible to reduce the size of the apparatus and secure the degree of freedom of optical system arrangement. it can.

  By the way, as described above, when the light reducing member 13 blocks the light amount by 100%, the illuminance on the screen naturally decreases. Therefore, when the light shielding rate of the light reducing member 13 is lowered while checking the screen, and the light is appropriately reduced by setting the light shielding rate so that the illuminance unevenness is inconspicuous, bright projection display without reducing much light quantity. An image can be obtained. Therefore, as described above, it is not always necessary to set the light shielding rate to 100%.

  Further, in the present embodiment, since the light reducing member 13 is arranged on the secondary light source surface C, the light beam emitted from the optical integrator 12 can be reduced at a position where the minimum diameter is obtained. The size (width in the X direction) of the dimming region 13A of the optical member 13 can be minimized.

  In the present embodiment, light attenuation (including light shielding) is performed by the light reducing member 13 for all wavelengths of R, G, and B. However, the present invention is not limited to this, and R, G, Only one or two of B may be shielded (including dimming). This can be realized by providing the light reduction region 13A of the light reduction member 13 with a band cut filter function. Specifically, light having a wavelength that has a large contribution to illuminance unevenness on the LCD is specified, and a band cut filter that cuts only light having this wavelength may be applied to the dimming region 13A. For example, it is conceivable to reduce only light of a specific wavelength (here, G light) that is transmitted through the cross mirror 15.

  In the present embodiment, each of the first and second lens arrays 12A and 12B constituting the optical integrator 12 is composed of 3 × 3 lenses, and the incident light flux is divided into nine light fluxes. Although illustrated, it may be divided into other numbers of light beams. By increasing the number of lenses in the first and second lens arrays 12A and 12B to increase the number of luminous flux divisions, the illuminance distribution on the irradiated surface can be made more uniform.

  Moreover, although the case where the light reducing member 13 is disposed on the secondary light source surface C has been described in the present embodiment, the present invention is not limited to this, and can be disposed at other positions. For example, as in the modification shown in FIG. 6, the dimming member 113 may be disposed between the optical integrator 12 and the light source 10. In this modification, a part of the light beam emitted from the light source 10 is dimmed before entering the optical integrator 12, but the dimming member 113 emits light incident on the intersection of the cross mirror 15. Properly arranged so that it can be dimmed without leakage. Therefore, also in this modification, the illuminance unevenness on the LCD can be suppressed as in the case of the present embodiment.

  Further, instead of disposing the light reducing member 13 separately from the optical integrator 12, a part of the lenses in the second lens array 12B may be used as the light reducing region 213 as in the modification shown in FIG. The dimming region 213 is appropriately arranged so that the light beam incident on the intersecting portion 40 of the cross mirror 15 can be dimmed without leakage. Therefore, also in this modification, the illuminance unevenness on the LCD can be suppressed as in the case of the present embodiment. In this case, since the dimming member 13 is not required separately, the number of parts can be reduced.

  While the present invention has been described with reference to the embodiment and its modifications, the present invention is not limited to these, and various modifications can be made. For example, in the above-described embodiment and the like, the cross mirror 15 is used as the optical path branching unit. However, the present invention is not limited to this, and the cross prism 17 can be used instead. The cross prism 17 is configured by combining a plurality of wavelength selection prisms with each other, like the wavelength combining cross prism 30 (FIG. 1).

  In the above-described embodiment and the like, the case where the G wavelength component is transmitted through the cross mirror 15 has been described. However, the present invention is not limited to this, and any one of the R and B wavelength components is used. One may pass through the cross mirror 15.

It is a top view showing the whole optical system of the image display apparatus in one embodiment of the present invention. It is a top view showing the principal part structure of an image display apparatus. It is a perspective view showing the principal part structure of an image display apparatus. It is a top view showing the principal part structure of the image display apparatus concerning a comparative example. It is a figure showing the illuminance distribution state on the to-be-irradiated surface of the image display apparatus concerning a comparative example. It is a top view showing the principal part structure of the image display apparatus concerning the modification of one embodiment of this invention. It is a top view showing the principal part structure of the image display apparatus concerning the other modification of one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Illumination optical system, 2B ... LCD for B, 2G ... LCD for G, 2R ... LCD for R, 3 ... Projection optical system, 10 ... Light source, 11 ... Filter, 12 ... Optical integrator, 12A ... 1st lens array , 12B ... second lens array, 12B1 to 12B9 ... lens, 13, 113 ... dimming member, 13A, 213 ... dimming region, 14-1, 2, 3, 4, 5, 6 ... lens, 15 ... cross Mirror, 16-1, 2, 3, 4 ... mirror, 17, 30 ... cross prism, 31 ... projection lens, 40 ... intersection, 213 ... dimming area, AX ... optical axis, C ... secondary light source surface.

Claims (10)

Light source means;
First dimming means for dimming a luminous flux outside the visible light region of the luminous flux from the light source means;
An optical integrator for forming a multi-light source composed of a plurality of light source images based on a light flux from the light source means;
A condenser optical system that condenses light beams from multiple light sources formed by the optical integrator and illuminates the irradiated surface in a superimposed manner;
An optical path branching unit configured to include an intersection so as to branch the light beam of the condenser optical system;
Image display means arranged on the irradiated surface;
A projection optical system for projecting an image formed by the image display means;
An image display device comprising: a second dimming unit that is provided between the optical path branching unit and the light source unit and attenuates light incident on the intersecting portion of the optical path branching unit. 2. The image according to claim 1, wherein the second dimming unit diminishes a light beam incident on the intersecting portion of the optical path branching unit among a plurality of light beams divided by the optical integrator. Display device. 2. The image according to claim 1, wherein the optical path branching unit is configured by combining a plurality of optical components, and a combination of the plurality of optical components forms the intersecting portion. Display device. The image display apparatus according to claim 1, wherein the second dimming unit is disposed at a position on a plane conjugate with an entrance pupil of the projection optical system. The image display apparatus according to claim 1, wherein the second dimming unit is disposed closer to the light source unit than the optical integrator. The optical path branching means branches the optical path of the emitted light beam into a plurality of optical paths according to the wavelength,
The image display apparatus according to claim 1, wherein the second dimming unit selectively dimmes only light having a specific wavelength. The image display device according to claim 6, wherein the light having the specific wavelength is light corresponding to an optical path in a direction of transmitting the optical path branching unit among the plurality of optical paths. The optical integrator is
A first lens array including a plurality of first lenses arranged in a predetermined arrangement state;
A second lens array including a plurality of second lenses arranged corresponding to each of the plurality of first lenses;
The image display apparatus according to claim 1, wherein a part of the first lens array or a part of the second lens array functions as the second dimming unit. The image display device according to claim 1, wherein the optical path branching unit is a cross mirror configured by crossing a plurality of wavelength selection mirrors. The image display device according to claim 1, wherein the optical path branching unit is a cross prism configured by combining a plurality of wavelength selection prisms.

Images