JP2008090017A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve miniaturization while excellently correcting aberrations by making the pupil shape of a projection optical system asymmetrical in a desired direction, thereby reducing sensitivity with respect to manufacturing errors. <P>SOLUTION: A spatial optical modulation element is illuminated by a luminous flux from the spatial optical modulation element and a light source unit 20 including a plurality of LED light sources 12 arranged in a first direction and in a second direction perpendicular to the first direction plurality by plurality. The projection optical system includes a rotation-asymmetrical reflecting curve, to enlarge and project the image of the spatial optical modulation element on a surface to be projected. The width D1 in the first direction of the light emitting area of the LED light sources 12 and the width D2 in the second direction of the light emitting area of the LED light sources 12 are different from each other and the projection optical system includes a diaphragm having an aperture whose width is different in the first direction and in the second direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display device such as a front projector and a rear projector.

  In general, an image display device uses a liquid crystal display panel or a micromirror array device as a spatial light modulator, controls light transmission and blocking or polarization, and projects a selected light pattern by a projection optical system. Display an image on the projection surface.

  The illumination device used in this image display device is generally composed of a high-intensity discharge lamp such as an ultra-high pressure mercury lamp, a metal halide lamp, or a xenon lamp, and a parabolic reflector that collimates illumination light from these light sources. Is. However, the high-intensity discharge lamp has problems such as an increase in the size of the lighting device due to the installation of a cooling device for heat dissipation and a short lifetime of several thousand hours.

  Therefore, in recent years, light sources using semiconductors have attracted attention as a new light source. Above all, improvement of LEDs (light-emitting diodes) is remarkable, and high-brightness and high-efficiency products that can withstand illumination applications are being developed. For example, a reflection type LED package in which a concave reflector 2 is arranged behind an LED 1 as shown in FIG. 18 according to Patent Document 1 or a synthetic resin material 4 around the LED 3 as shown in FIG. A bullet-shaped LED package molded into a shape is known.

  Compared with the high-intensity discharge lamp described above, the LED is advantageous in terms of small size, light weight, low power consumption, long life, high-speed response of lighting, etc. It is difficult to obtain sufficient brightness on the screen. The reason is that the LED has not yet reached the ultra-high pressure mercury lamp in terms of efficiency, and the amount of light obtained from one LED is small even when a current at the rated limit is injected. For this reason, there is a method in which a plurality of LEDs are arranged on a plane in order to increase the amount of light.

  For example, in Patent Document 3, a plurality of solid-state light emitting elements are arranged in a matrix, and brightness is improved by integrated illumination in which light beams from each of the solid-state light emitting elements are superimposed on the spatial light modulator. Further, for example, in Patent Document 4, a plurality of solid state light emitting elements are two-dimensionally arranged, and the light emitting surface of each solid state light emitting element and the spatial light modulation element are arranged in a conjugate relationship, whereby an enlarged image of the light emitting surface is displayed. By superimposing on the top, uniform and high brightness illumination is realized.

  As a projection optical system used for an image display apparatus such as a projector or a rear projector, a wide-angle lens of a coaxial optical system in which the optical axis connecting the center of the object plane and the center of the image plane is not bent as shown in Patent Document 5 or the like. The ones used are well known.

  However, in recent years, a projection optical system called an off-axial optical system in which the optical axis is bent as shown in Patent Document 6 has been proposed. . This off-axial optical system has the advantage that it is possible to correct trapezoidal distortion during oblique projection and that it is easy to widen the angle compared to the coaxial system.

JP 2001-185760 A JP 2003-234513 A JP 2001-281760 A JP 2004-286858 A JP 2005-106948 A JP 2005-24695 A

  Off-axial optical systems using reflective surfaces as described above have many advantageous characteristics over conventional coaxial optical systems, but are often sensitive to manufacturing errors such as surface accuracy and decentration, and are mass-produced. It is mentioned as a problem. For example, when an asymmetric error occurs in the surface shape, a focus position shift in two orthogonal directions within the image plane, that is, an astigmatism difference, occurs across the entire image plane, which is removed by mechanical adjustment. It is difficult.

  Therefore, Patent Document 6 discloses a solution for this problem, in which the pupil of the off-axial optical system is configured to be asymmetric in the off-axial section and the section perpendicular to the section. As a result, the sensitivity to the manufacturing error of the off-axial optical system is reduced, and downsizing can be achieved while correcting aberrations well. That is, in order to use an off-axial optical system using a reflecting surface as a projection optical system of an image display device, an illumination optical system for achieving an asymmetric pupil shape without reducing the illumination efficiency of the entire image display device Is essential.

  In a conventional image display device using a combination of a high-intensity discharge lamp and a reflector as a light source, since the reflector opening has a substantially circular shape, a projection optical system having a generally rotationally symmetric aperture shape is employed. Yes. Alternatively, it is also known that the aperture of the projection optical system has an asymmetric shape by arranging a cylindrical lens or the like in the illumination optical system and compressing the illumination light beam in a desired direction.

  However, since the product of the area of the light source and the divergent solid angle of the light beam is stored in the optical system (preservation of etendue), there is a limit to the control of the aperture shape of the projection optical system. In order to solve this limitation, it is desirable that the light source itself has a shape with a different aspect ratio. For this purpose, small solid-state light emitting elements are arranged in an array and are matched to the desired aperture shape of the projection optical system. It needs to be shaped.

  However, Patent Documents 3 and 4 array solid-state light-emitting elements mainly for the purpose of improving luminance and reducing luminance unevenness on the spatial light modulator. Therefore, the relationship between the light source and the pupil or stop of the projection optical system is not described, and is not for controlling the stop shape of the projection optical system, and is different from the present invention.

  The object of the present invention is to eliminate the above-mentioned problems and make the pupil shape of the projection optical system asymmetric in a desired direction, thereby reducing sensitivity to manufacturing errors and achieving downsizing while satisfactorily correcting aberrations. An image display device is provided.

  In order to achieve the above object, the technical feature of the image display device according to the present invention is that a spatial light modulator and a plurality of elements arranged in a first direction and in a second direction perpendicular to the first direction are arranged. An illumination optical system that illuminates the spatial light modulation element with a light beam from a light source unit including the solid-state light emitting element, and projection optics that includes a rotationally asymmetric reflection curved surface and enlarges and projects an image of the spatial light modulation element on a projection surface A width of the light emitting region of the solid-state light emitting element in the first direction is different from a width of the second direction, and the projection optical system includes the first direction and the first direction. The object is to provide a diaphragm having openings having different widths in two directions.

  According to the image display device of the present invention, the light source unit having a light emitting region having a different width in the first direction and the second direction perpendicular to the first direction, and an aperture stop having a different width in the first direction and the second direction. By having the illumination efficiency, the illumination efficiency can be increased. Thereby, a bright image can be displayed.

  The present invention will be described in detail based on the embodiment shown in FIGS.

  FIG. 1 is a front view of a light source unit according to a first embodiment. This light source unit is a light source unit used in FIGS. 2 and 3 to be described later, or an image display apparatus (projector) shown in FIG. It is a light source unit used for etc. In the light source unit 11, a plurality of LED light sources 12 that are solid-state light emitting elements are arranged in a rectangular shape with eight rows in the vertical direction (first direction) and two rows in the horizontal direction (second direction) perpendicular to the vertical direction. Has been. The LED light sources 12 are arranged so that the light-emitting area has a vertical to horizontal ratio of 4: 1 (8: 2).

  2 is a cross-sectional view taken along a plane including the optical axis and the longitudinal direction of the illumination optical system, and FIG. 3 is a cross-sectional view taken along a plane perpendicular to the cross section of FIG. 2 including the optical axis of the illumination optical system. In front of the light source unit 11, the spatial light modulation element 14, the illumination optical system 13 that illuminates the spatial light modulation element with the light flux from the light source unit 11, and the projection that projects the light flux from the spatial light modulation element 14 onto the projection surface S. An optical system 15 is arranged. The projection optical system 15 is an off-axial projection optical system having a plurality of rotationally asymmetric reflecting surfaces, and a diaphragm surface 16 having openings having different aspect ratios is arranged as a diaphragm member in the projection optical system 15.

  Note that the rotationally asymmetric reflecting surface (free curved surface) included in the off-axial projection optical system may be a plurality of surfaces or more, but it is preferable that the number of surfaces is four or more. The plurality of rotationally asymmetric reflecting surfaces are integrally supported by a single support structure (not shown), and it is desirable that the support structure be held by the housing of the image display device.

  The light beams emitted from the plurality of LED light sources 12 pass through the projection optical system 15 and form an image on the diaphragm surface 16 of the projection optical system 15. Here, the formation position of the light source image is 1/3 or less, or 1/8 or less (more preferably 1) of the focal length of the projection optical system 15 from the aperture position (focal length at the wide angle end in the case of a variable magnification optical system). / 10 or less), there is no problem even if it is deviated. Further, the spatial light modulation element 14 is illuminated substantially uniformly by a condenser lens that is a component of the illumination optical system 13, and an image formed by the spatial light modulation element 14 is projected by the projection optical system 15 through the diaphragm surface 16. The image is enlarged and projected on the surface S.

  FIG. 4 shows the illuminance distribution on the spatial light modulator 14. As can be seen from FIG. 4, the luminous flux emitted from each LED light source 12 of the light source unit 11 is superimposed on the spatial light modulation element 14 by the illumination optical system 13. The light modulation element 14 can be illuminated uniformly.

FIG. 5 shows the aperture shape of the aperture surface 16, and the aperture aperture shape is similar to the outer shape of the light emitting region of the light source unit 11 in FIG. 1. Here, among the widths of the light emitting regions of the light source unit 11, the longest direction is the first direction, the direction perpendicular thereto is the second direction, the width of the light emitting region in the first direction is D1, and the second direction of the light emitting region is the second direction. The width in the direction is D2. The ratio between the widths D1 and D2 is the width in the first direction (corresponding to D1) and the width in the second direction (corresponding to D2) of the light source images of these light source units 11 formed in the projection optical system 15. ) To derive the ratio. Further, at the aperture position at that time, the width of the aperture opening in the direction corresponding to the first direction in the light emitting region is d1, and the width of the aperture opening in the direction perpendicular thereto is d2. At this time, it is desirable to satisfy the following conditional expression.
d1 / d2 × 0.8 <D1 / D2 <d1 / d2 × 1.2 (1)

More preferably, it is desirable to satisfy the following conditional expression.
d1 / d2 × 0.9 <D1 / D2 <d1 / d2 × 1.1 (1a)

  Note that the above-mentioned similarity relationship means that these conditions are satisfied. In the first embodiment, D1 / D2 = 4 and d1 / d2 = 4.

  FIG. 6 shows the illuminance distribution due to the light beam incident on the diaphragm surface 16. The illuminance distribution on the diaphragm surface 16 is also similar to the outer shape of the light source unit 11, and by arranging a diaphragm having a similar relationship, flare light, higher-order diffracted light, etc. This light can be blocked by a diaphragm. More specifically, it is preferable to consider the magnification of the light source image formed by the optical system between the LED light source 12 and the stop.

That is, it is desirable to satisfy the following conditional expression when the magnification of the light source image is M.
0.9 × M × D1 <d1 <1.3 × M × D1 (2)
0.9 × M × D2 <d2 <1.3 × M × D2 (3)

More preferably, it is desirable to satisfy the following conditional expression.
1.0 × M × D1 <d1 <1.2 × M × D1 (2a)
1.0 * M * D2 <d2 <1.2 * M * D2 (3a)

  Here, as shown by the conditional expressions (2) and (3), when this value is less than 1, a part of the light is cut and darkened. However, if it is desired to increase the contrast at the expense of some brightness, the values of the conditional expressions (2) and (3) may be made smaller than 1 in order to block light that causes a decrease in contrast. At this time, as indicated by the numerical ranges of the conditional expressions (1) and (1a), the aspect ratio of the light emitting region and the aspect ratio of the aperture of the aperture may be different from each other. Hereinafter, the difference between the aspect ratio of the light emitting region and the aspect ratio of the aperture of the stop will not be described. However, in the following examples, the ratio between the ratios is within the ranges shown in the conditional expressions (1) and (1a). Even if they are slightly different, there is no problem.

In the above-described off-axial optical system, it is desirable that the aspect ratio, which is the ratio between the width in the first direction and the width in the second direction, of the aperture of the stop is somewhat large. Of course, it is desirable that the aspect ratio, which is the ratio between the number of vertical arrangements of LED light sources 12 in the light emitting region and the number of horizontal arrangements, is also somewhat large. That is, it is desirable to satisfy the following conditions.
1.1 <D1 / D2 <10.0 (4)
1.1 <d1 / d2 <10.0 (5)

More preferably, the following conditional expression is satisfied.
1.2 <D1 / D2 <5.0 (4a)
1.2 <d1 / d2 <5.0 (5a)

It is still more preferable that the following is satisfied.
1.5 <D1 / D2 (4b)
1.5 <d1 / d2 (5b)

  In this embodiment, the LED light sources 12 are arranged in 2 × 8, but the number of light sources is not limited to this, and there is no problem even if the number of light sources is increased or decreased according to the required luminance. Of course, it is preferable to use a plurality of lenses for the illumination optical system 13 and the projection optical system 15, and there is no problem even if there is a lens constituting the projection optical system 15 on the projection surface side of the diaphragm surface 16.

  Furthermore, although the spatial light modulator 14 shown in FIGS. 2 and 3 is described as a transmissive single-plate liquid crystal display element, this is not restrictive. For example, it is also possible to use a plurality of LED light sources that emit a plurality of colored lights having different colors and a plurality of spatial light modulation elements 14 corresponding to the respective LED light sources. For example, an image display device can be configured by using LED light sources that emit red light, green light, and blue light, respectively, and transmissive or reflective liquid crystal display elements corresponding to the respective color lights. When a white LED light source is used, a plurality of spatial light modulation elements 14 corresponding to colors can be used by providing the apparatus with a color separation function and a color synthesis function. A type liquid crystal element or DMD can also be used.

  In this way, in an image display device having a flat aperture stop shape, for example, having a different aspect ratio suitable for an off-axial projection optical system, illumination with high illumination efficiency can be achieved with a simple configuration.

  FIG. 7 is a front view of the light source unit 20 according to the second embodiment. The portions that are not particularly described are the same as those in the first embodiment, and the light source unit 20 can also be suitably applied to the optical systems in FIGS. 2 and 3 described above or the image display device in the third embodiment described later.

  In the light source unit 20 of the second embodiment, 28 LED light sources 12 are arranged so that the light emitting area is substantially elliptical. FIG. 8 shows the illuminance distribution on the spatial light modulator 14 when the light source unit 20 is used, and an elliptical uniform illuminance can be obtained.

  FIG. 9 shows the aperture shape of the aperture surface 16, and the aperture shape is similar to the outer shape of the light source unit 20 shown in FIG. Further, FIG. 10 shows an illuminance distribution by light incident on the diaphragm surface 16. From FIG. 10, it can be seen that the illuminance distribution on the diaphragm surface 16 is similar to the outer shape of the light source unit 20. In the second embodiment, D1 / D2 = 2 and d1 / d2 = 2.

  FIG. 11 is a front view of the light source unit of the first modification. Here, the LED light sources 12 which are a total of 25 solid-state light emitting elements are arranged vertically long, that is, so that the width in the first direction is longer than the width in the second direction. FIG. 12 illustrates an aperture shape of the diaphragm surface 16 in the projection optical system 15 in this case, and an image of the LED light source 12 with respect to the aperture shape. From FIG. 12, it can be seen that the image of the LED light source 12 is almost within the aperture of the diaphragm surface 16, and light can be used effectively. In this embodiment, D1 / D2 = d1 / d2≈1.59.

  FIG. 13 is a front view of the light source unit of the second modification. Here, a total of 43 LED light sources 12 are arranged vertically long, that is, so that the width in the first direction is longer than the width in the second direction. At this time, FIG. 14 shows the aperture shape of the diaphragm member in the projection optical system 15 and the image of the solid-state light emitting element corresponding to the aperture shape. As can be seen from FIG. 14, the image of the LED light source 12 is almost within the aperture of the diaphragm surface 16, and it can be seen that light can be used effectively. In this embodiment, D1 / D2 = d1 / d2≈1.13.

  FIG. 15 is a configuration diagram of a projector (image display device) according to the third embodiment, which is roughly divided into a projection optical system 22 including an illumination unit 21 and an off-axial optical system. In the illumination unit 21, a light source unit 23, an illumination optical system 24, a dichroic mirror 25, three polarization beam splitters (PBS) 26, 27, and 28, three reflective liquid crystal panels 29 of RGB3 plate type as a spatial light modulator, 30 and 31. As shown in FIG. 16, the light source unit 23 has the same configuration as the light source unit 20 of FIG. 7, but other light source units may be used.

  The projection optical system 22 includes a zoom lens 32 that receives light emitted from the illumination unit 21, a diaphragm surface 33, a folding mirror 34, a plurality of rotationally asymmetric reflecting surfaces 35 to 38 having a reflecting curved surface, a folding mirror 39, and a lens 40. As a component. Here, the folding mirror 34 functions as an aperture. That is, the diaphragm (diaphragm surface) does not have an aperture as described in the first and second embodiments, but the optical system other than the light incident on a certain region, that is, the rotationally asymmetric reflecting surface 35 in this case. It is a member for preventing it from being led to.

  A certain area described here corresponds to the opening (part) in the above-described embodiment. Alternatively, even if the folding mirror 34 has a shape that performs the same function as that in the case where a diaphragm having an opening having a vertical width d1 and a horizontal width d2 is arranged at the diaphragm position, included. As a matter of course, a stop having an opening may be disposed between the zoom lens 32 and the folding mirror 34 or between the folding mirror 34 and the rotationally asymmetric reflecting surface 35.

  In the projection optical system 22, the zoom lens 32 does not have to be scaled, and the lens 40 can be a refractive optical system including a plurality of lenses and diffractive optical elements. Further, the projection optical system 22 of the present embodiment may be composed of only a mirror, or conversely, it may be composed of only a lens and a diffractive optical element.

  Here, the reference axis light beam that passes through the center of the reflective liquid crystal panels 29, 30, 31, that is, emits perpendicularly from the center or is the principal ray of the light beam emitted from the center, is reflected on the paper surface along the reflective surfaces 35 to 38. The reference axis light beam is projected obliquely with respect to the projection surface. Accordingly, the exit pupil of the zoom lens 32, that is, the shape of the diaphragm surface 33, is a shape in which the Y direction, which is the direction of the diaphragm diameter on the paper surface, is crushed to be smaller than the X direction, which is the direction perpendicular to the paper surface. Has been.

  Therefore, the aperture shape of the diaphragm surface 33 is an elliptical shape crushed in the Y direction as shown in FIG. Correspondingly, the light source unit 23 also has a similar relationship with the aperture shape of the diaphragm surface 33 and is arranged so that the outer shape is an elliptical shape crushed in the Y direction, from the viewpoint of aberration correction and miniaturization. Is preferred.

  Thus, by arranging the light source unit 23 and the diaphragm surface 33 of the projection optical system 22 in a conjugate relationship, the illuminance distribution on the diaphragm surface 33, that is, the pupil plane, is controlled by the arrangement of the LED light sources 12 in the light source unit 23. can do. Therefore, a highly efficient asymmetric pupil shape can be realized with a simpler configuration of the illumination unit 21 than in the past.

  In the embodiment, the illuminance distribution on the diaphragm surface 33 of the projection optical system 22 is similar to the outer shape of the light source unit 23. However, the light beam is compressed in an arbitrary direction using a cylindrical lens or the like, It is also possible to adjust to a desired aperture shape.

  The image display apparatus is not limited to the front projector of this embodiment, but can also be used for a rear projector, and the components of the projection optical system can be increased or decreased as necessary.

  Note that the aperture shape of the diaphragm or the shape of a certain area on the folding mirror described in the present embodiment is a shape having a different vertical width and horizontal width, and 180 ° rotational symmetry (two-fold rotational symmetry). It is desirable. Along with this, the shape of the light emitting region of the light source unit is also preferably a 180 ° rotationally symmetric shape with different vertical and horizontal widths. In addition, the vertical width of the opening shape (the width in the first direction, that is, the longer width) optically corresponds to the vertical width of the light emitting region (the width corresponding to the first direction, that is, the longer width). It is desirable that The “width” here is preferably a width in a direction perpendicular to the optical axis of the illumination optical system or the projection optical system.

  In the present embodiment, the widths D1 and d1 and the widths D2 and d2 need only correspond to each other, and the widths D1 and d1 are not necessarily in the vertical direction, and the widths D2 and d2 are not necessarily in the horizontal direction. The vertical and horizontal directions may be reversed, and the first direction and the second direction may be set so that the widths D1 and d1 are larger than the widths D2 and d2. Of course, there is no problem even if the opening shape and the shape of the light emitting region are non-rotational symmetric (360 degree rotational symmetry, one time rotational symmetry).

  By applying the present embodiment as described above, only in the shape control of the two-dimensional light source in which a plurality of solid state light emitting elements are arranged in the vertical direction and the horizontal direction, even in the configuration of the illumination optical system simpler than before, Highly efficient illumination can be performed without lowering the overall illumination efficiency.

  Since an optimal pupil shape can be realized for an asymmetric flat diaphragm shape, the sensitivity to the manufacturing error of the off-axial projection optical system can be reduced, and downsizing can be achieved while satisfactorily correcting aberrations. Specifically, the aperture diameter in the direction on the paper surface in FIG. 11 is made smaller than the aperture diameter in the direction perpendicular to the paper surface, thereby reducing sensitivity to manufacturing errors, correcting aberrations and reducing the size of the projection optical system. Can be achieved. Further, by reducing the aperture diameter in the direction parallel to the paper surface, it is possible to reduce the incident angle distribution with respect to the separation / combination surface of a separation / combination element such as a dichroic mirror or a polarization beam splitter.

  When the incident angle on the separation / combination surface of such a separation / combination element deviates from the rated value, the contrast deterioration of the image display device due to the incident angle characteristic of the light separation / combination can be improved. The term “paper surface” as used herein refers to a plane parallel to the normal lines of a plurality of image forming elements (liquid crystal panels), or the normal line of the polarization splitting surface of the polarization beam splitter and the normal lines of the image forming elements. The plane is parallel to both normals.

  A solid-state light-emitting element image is formed twice or more between the light source unit and the projection surface, so that an intermediate image is formed in the projection optical system, and a wide-angle projection is performed while suppressing an increase in the size of the optical surface. An optical system is obtained.

FIG. 3 is a front view of the light source unit according to the first embodiment. It is sectional drawing by the plane containing the optical axis and longitudinal direction of an illumination optical system. FIG. 3 is a cross-sectional view taken along a plane that includes the optical axis of the illumination optical system and is perpendicular to the cross section of FIG. 2. It is an illumination distribution map on a spatial light modulation element. It is a front view of an aperture shape. It is an illuminance distribution figure on a diaphragm surface. 6 is a front view of a light source unit according to Embodiment 2. FIG. It is an illumination distribution map on a spatial light modulation element. It is a front view of an aperture shape. It is an illuminance distribution figure on a diaphragm surface. It is a front view of the light source unit of the modification 1. It is explanatory drawing of the aperture shape of the modification 1, and the image of a light source unit. It is a front view of the light source unit of the modification 2. It is explanatory drawing of the aperture shape of the modification 2, and the image of a light source unit. FIG. 6 is a configuration diagram of an optical system of Example 3. It is a front view of a light source unit. It is a front view of an aperture shape. It is a block diagram of the reflection type LED package of a prior art example. It is a block diagram of a conventional bullet-type LED package.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11, 20, 23 Light source unit 12 LED light source 13 Illumination optical system 14 Spatial light modulation element 15, 22 Projection optical system 16, 33 Diaphragm surface 21 Illumination part 29, 30, 31 Reflective liquid crystal panel 32 Zoom lens 34, 39 Folding mirror 35-38 rotationally asymmetric reflecting surface 40 lens

Claims (8)

  The spatial light modulation element is illuminated with a light beam from a light source unit including a spatial light modulation element and a plurality of solid state light emitting elements arranged in a first direction and a second direction perpendicular to the first direction. An image display apparatus comprising: an illumination optical system; and a projection optical system that includes a rotationally asymmetric reflection curved surface and enlarges and projects an image of the spatial light modulation element on a projection surface, wherein the light emitting region of the solid light emitting element An image display characterized in that a width in the first direction and a width in the second direction are different from each other, and the projection optical system includes an aperture having openings having different widths in the first direction and the second direction. apparatus.   The image display apparatus according to claim 1, wherein an image of the solid-state light emitting element is formed at the position of the diaphragm.   3. The image display device according to claim 1, wherein the number of the solid-state light emitting elements arranged in the first direction is different from the number of the solid-state light emitting elements arranged in the second direction.   The image display device according to claim 1, wherein the light emitting region and the aperture shape of the stop are in a similar relationship.   5. The image display device according to claim 1, wherein the image of the solid-state light emitting element is formed twice or more between the light source unit and the projection surface. When the width in the first direction of the light emitting region is D1, the width in the second direction is D2, the width in the first direction of the aperture of the diaphragm is d1, and the width in the second direction is d2.
d1 / d2 × 0.8 <D1 / D2 <d1 / d2 × 1.2
The image display device according to any one of claims 1 to 5, wherein: When the width in the first direction of the light emitting region is D1, and the width in the second direction is D2,
1.1 <D1 / D2 <10.0
The image display device according to any one of claims 1 to 6, wherein: When the width in the first direction of the opening is d1, and the width in the second direction is d2,
1.1 <d1 / d2 <10.0
The image display device according to claim 1, wherein the image display device satisfies the following.

Images