JP5339746B2 - Image projection apparatus and image display system - Google Patents

Description

  The present invention relates to an image projection apparatus such as a liquid crystal projector that performs Koehler illumination of a spatial light modulation element with light from a plurality of laser light sources and projects light from the spatial light modulation element onto a projection surface.

  The image projection apparatus illuminates a spatial light modulation element (image forming element) such as a liquid crystal panel or a micromirror array device with light from a light source, and emits light modulated by the spatial light modulation element in accordance with an input image signal. The image is displayed by projecting it on the screen.

  A light source used in a conventional image projection apparatus includes a high-intensity discharge lamp such as an ultra-high pressure mercury lamp, a metal halide lamp, or a xenon lamp, and a reflector that collimates and emits light from these lamps. However, the high-intensity discharge lamp has a problem that power consumption is large and a mechanism for cooling the lamp within a predetermined temperature range is required, resulting in an increase in the size of the image projection apparatus. Further, there is a problem that the life of the high-intensity discharge lamp is generally as short as several thousand hours.

  Therefore, in recent image projection apparatuses, it has been studied to use a semiconductor light emitting element as a light source. The semiconductor light emitting device has advantageous features such as low power consumption, less performance degradation due to heat generation, and long life compared to a high-intensity discharge lamp.

  When such a semiconductor light emitting element is used as a light source of an image projection apparatus, a plurality of semiconductor light emitting elements are used as disclosed in Patent Documents 1 to 3 in order to obtain an amount of light equivalent to that of a high-intensity discharge lamp. Arrange them on a plane.

  In the light source disclosed in Patent Document 1, a plurality of red (R), green (G), and blue (B) light emitting elements are arranged on the same plane. By arranging G light emitting elements with high visibility in a point-symmetric manner, high luminance illumination, uneven illuminance, and miniaturization are achieved without requiring color synthesis before the integrator optical system.

  Further, in the light source disclosed in Patent Document 2, a plurality of light emitting element rows each including R, G, and B light emitting elements are arranged so as to be shifted between adjacent rows, thereby reducing size and reducing illuminance unevenness. I am trying.

  Furthermore, in the light source disclosed in Patent Document 3, a plurality of light emitting elements are arranged on a plurality of concentric circles, and the ratio of the amount of light incident on the light guide (optical fiber) from the light emitting elements on each concentric circle is The ratio is the same as the circumference ratio. Thereby, high brightness illumination, reduction of illuminance unevenness, and miniaturization are achieved.

  In addition, miniaturization of spatial light modulation elements used in image projection apparatuses is progressing, and liquid crystal panels having a pixel size of 6 μm or less have been developed. For such an image projection apparatus using a spatial light modulator with a small pixel size, a projection optical system (projection lens) having higher resolution is required.

  As an index indicating the capability of the projection optical system, it is general to use a response function called MTF of spatial frequency. FIG. 7 shows the relationship between the spatial frequency at the same F value, that is, the number of lines (lines / mm) per unit length, and the MTF value, that is, the image reproducibility in the conventional projection optical system. Show. A higher MTF value means better imaging performance. As shown in FIG. 7, as the spatial frequency increases, the MTF value decreases and finally becomes zero. The spatial frequency at which the MTF is 0 differs depending on the wavelength (wavelength region) indicated by the curves R, G, and B in FIG. 7, and in an optical system with a small geometric optical aberration, the magnitude relationship of the MTF depending on the wavelength is the total spatial frequency. The same is true across the region.

The spatial frequency at which MTF is 0 is called the diffraction limit, and the diffraction limit varies depending on the wavelength. The spatial frequency f, which is the diffraction limit, is determined by Rayleigh research.
f = 1 / (1.22 × λ × Fno) (1)
It is known that Here, λ is the wavelength, and Fno is the F value of the optical system. An MTF exceeding the diffraction limit cannot be obtained in principle. Further, in the conventional optical system having the same F value regardless of the wavelength, the resolution limit differs depending on the wavelength as shown in FIG.

  In a projection optical system capable of reducing the F-number while sufficiently correcting the geometric optical aberration using a plurality of optical elements, that is, increasing the diameter of the stop, the diffraction limit represented by the expression (1) is sufficiently high. Thus, the influence of the wavelength difference can be almost ignored.

  However, in general, an optical system having a small F value is larger in size than an optical system having a large F value. In a conventional image projection apparatus using a high-intensity discharge lamp as a light source, a projection optical system having a small F value (F value of about 1.8 to 3) is adopted in order to satisfy the conditions of illumination efficiency and high luminance. The This is because the high-intensity discharge lamp is a divergent light source having a finite size, that is, the Etendue (product of the light emitting area and the solid angle) is large. For this reason, in the conventional image projection apparatus using the high-intensity discharge lamp, it is not necessary to consider the influence of the diffraction limit. However, the projection optical system becomes large, and the apparatus becomes large.

Therefore, in future image projection apparatuses, it is important to have a light source that can realize downsizing of the projection optical system and thus downsizing of the apparatus without deteriorating the imaging performance of the projection optical system.
JP 2006-308714 A JP 2004-334081 A JP 2004-248834 A

  In the semiconductor laser element, the light emitting area is as small as several μm, and light with good directivity is emitted therefrom, so that the Etendue is very small. For this reason, when a semiconductor laser element is used as a light source, it is possible to freely select the F value of the projection optical system used in the image projection apparatus while maintaining good illumination efficiency.

  In order to improve the imaging performance of a projection optical system reduced in size by a limited number of optical elements, in general, by increasing the F value, the influence of geometric optical aberration can be suppressed and the resolution of an image can be improved. .

  However, when the spatial frequency to be used is increased, that is, the pixel size of the spatial light modulator is reduced, the resolution is limited by wave optics due to the diffraction limit given by the equation (1). On the other hand, if the F-number is reduced, the theoretical resolution limit increases, but there is a limit to improvement in resolution in a projection optical system that is miniaturized by a limited optical element due to geometric optical aberration.

  Therefore, there is an appropriate point for reconciling the F value and resolution of the miniaturized projection optical system. As can be seen from the equation (1), this differs depending on the wavelength, and it is difficult to realize a form close to ideal in a conventional image projection apparatus having the same F value regardless of the wavelength.

  Having different F values depending on the wavelengths is effective in using the potential of a projection optical system having a finite optical element in a region close to the diffraction limit.

  The light sources disclosed in Patent Documents 1 to 3 are designed to improve the illuminance uniformity and downsize around the light source by devising the arrangement of R, G, and B light emitting elements on the same plane. However, it is difficult to achieve downsizing of the projection optical system considering the diffraction limit of each wavelength.

  The present invention provides an image projection apparatus that can reduce the size of a projection optical system without degrading the imaging performance of the projection optical system even when a spatial light modulation element having a small pixel size is used.

Image projection apparatus according to one aspect of the present invention includes a light source array including multiple respective Relais chromatography The light source Hassu light of wavelength region that different from each other, the surface to be illuminated of Koehler illumination with light from the light source array An illumination optical system, a spatial light modulation element that is disposed on the illuminated surface and modulates light from the illumination optical system, and a projection optical system that projects the light from the spatial light modulation element onto the projection surface having. Their to the light source array, the average distance to the plurality of laser light sources emitting light of the same wavelength range from the center of the light source array, comprising a larger area as the wavelength region is on the long wavelength side And

  According to the present invention, even when a spatial light modulator having a small pixel size is used, the projection optical system can be reduced in size without deteriorating the imaging performance of the projection optical system, and the image projection apparatus can be reduced in size. Can be planned.

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

  FIG. 2 shows the configuration of the optical system of the image projection apparatus (liquid crystal projector) that is Embodiment 1 of the present invention.

  In FIG. 2, reference numeral 11 denotes a light source unit (light source array) including a plurality of laser light sources that emit light in a plurality of different wavelength regions, and 13 performs Koehler illumination of the surface to be illuminated using the light from the light source unit 11. It is an illumination optical system. Reference numeral 14 denotes a spatial light modulation element (image forming element) disposed on the illuminated surface. In this embodiment, a liquid crystal panel is used.

  Reference numeral 15 denotes a projection optical system 15 that projects light from the spatial light modulation element 14 onto a projection surface (screen, wall surface, etc.) (not shown), and 16 denotes a pupil plane of the projection optical system 15, which has an aperture stop. This is the diaphragm surface.

  As the spatial light modulation element 14, a transmissive or reflective liquid crystal panel can be used. Further, a micro mirror array device in which a plurality of minute movable mirrors constituting a plurality of pixels are arrayed may be used as the spatial light modulation element 14.

  Although FIG. 2 shows that the illumination optical system 13 and the projection optical system 15 are each constituted by a single lens, each is actually constituted by a plurality of lenses. Further, a lens constituting the projection optical system 15 may be disposed closer to the projection surface side than the diaphragm surface 16 in the projection optical system 15.

  FIG. 1 shows the light source unit 11 as viewed from the illumination optical system side (spatial light modulation element side).

  In the light source unit 11, a plurality of semiconductor laser elements (hereinafter simply referred to as laser elements) 11R, 11G, and 11B as solid-state laser light emitting elements (laser light sources) that emit light in different wavelength regions are arranged. The red laser element 11R emits light R in the red wavelength region, and the green laser element 11G emits light G in the green wavelength region. The blue laser element 11B emits light B in the blue wavelength region.

  The semiconductor laser elements for each color are arranged in an array as shown in FIG. The blue laser element 11 </ b> B is disposed near the center O of the light source unit 11. The green laser element 11G is disposed so as to surround the outside of the blue laser element 11B. Further, the red laser element 11R is disposed so as to surround the outside of the green laser element 11G.

  A plurality of light beams from the laser elements 11R, 11G, and 11B are superimposed on each other on the modulation surface of the spatial light modulation element 14 by the condensing action of the condenser lens included in the illumination optical system 13. Thereby, Koehler illumination is performed on the modulation surface of the spatial light modulation element 14, and the modulation surface is uniformly illuminated so that luminance unevenness of each color light does not occur.

  A drive circuit 20 is connected to the spatial light modulation element 14, and an image supply device 30 such as a personal computer, a DVD player, or a TV tuner is connected to the drive circuit 20. The drive circuit 20 drives the spatial light modulator 14 based on the image information input from the image supply device 30 to form an original image corresponding to the image information. The spatial light modulation element 14 modulates (image modulation) the light from the illumination optical system 13 according to the original image. The image supply apparatus 30 and the image projection apparatus constitute an image display system.

  The light modulated by the spatial light modulation element 14 forms an image on the diaphragm surface 16 by the projection optical system 15 and then is enlarged and projected onto the projection surface.

  FIG. 3 shows the illuminance distribution on the diaphragm surface 16 of the projection optical system 15. The light source unit 11 and the diaphragm surface 16 are arranged at conjugate positions by the illumination optical system 13 and the projection optical system 15. For this reason, the illuminance distribution on the diaphragm surface 16 is a (similar) distribution corresponding to the arrangement of the laser elements on the light source unit 11. That is, the light beam diameters of the three color lights of R, G, and B are different from each other on the diaphragm surface 16.

When the F value (Fno) of the projection optical system 15 for each of R light, G light, and B light is FR, FG, FB,
FR <FG <FB
The relationship holds.

  By configuring as described above, the potential of the projection optical system 15 having a finite optical element can be used in a region near the diffraction limit.

  For example, when the pixel size of the spatial light modulator 14 is 8 μm and the center wavelengths of the three color lights of R, G, and B are 640, 532, and 450 nm, respectively, the diffraction limit is set for each of the three center wavelengths. The F value is 10.2, 12.3, 13.4 from the equation (1).

  In this case, in order to maintain the resolution performance of the projection optical system 15, it is desirable to set the F values for the three color lights to 8, 10, 11 or less, respectively, in consideration of the influence of diffraction. That is, since the influence of the diffraction limit is more prominent as the light on the longer wavelength side, a smaller F value is required for the light on the longer wavelength side. For this reason, in the conventional image projection apparatus having the same F value regardless of the wavelength, the projection optical system is enlarged due to the degradation of the MTF due to the diffraction of light on the long wavelength side. Moreover, the MTF differs for each wavelength, and a projection optical system that is over-spec for light on the short wavelength side is required.

  On the other hand, in this embodiment, the semiconductor laser elements in the light source unit 11 are arranged in consideration of the diffraction limit. That is, a blue laser element (first laser light source) 11B that emits B light in the shortest wavelength region λ1 among R, G, and B is disposed on the inner periphery (near the center O) of the light source unit 11. In addition, a red laser element (second laser light source) 11 </ b> R that emits R light in the longest wavelength region λ <b> 2 among R, G, and B is disposed on the outer periphery of the light source unit 11.

  In other words, the plurality of blue laser elements 11B and the plurality of red laser elements 11R are arranged so as to satisfy the following condition 1.

(Condition 1) rλ1 <rλ2
However, rλ1 is an average distance from the center O of the light source unit 11 of the plurality of blue laser elements 11B, and rλ2 is an average distance from the center O of the light source unit 11 of the plurality of red laser elements 11R.
Furthermore, in this embodiment, the blue, green, and red laser elements 11B, 11G, and 11R have an average distance from the center O of the light source unit 11 to a plurality of laser elements that emit light in the same wavelength region. Is arranged so as to increase as the wavelength becomes longer (in the order of blue, green and red).

  The average distance is represented by D / m where m is the number of laser elements and D is the sum of the distances d from the center O of the light source unit 11 to the centers of these laser elements.

  Furthermore, in this embodiment, the blue laser element 11B and the red laser element 11R are arranged so as to satisfy the following condition 2.

(Condition 2) 1.2 <rλ2 / rλ1 <1.6
By arranging the blue laser element 11B and the red laser element 11R so as to satisfy Condition 1 (preferably Condition 1 and Condition 2), it is possible to appropriately match the F value and resolution performance of the projection optical system 15 It becomes. For this reason, when using the illumination optical system 13 that performs Koehler illumination as in the present embodiment, it is possible to achieve both reduction in size of the projection optical system 15 and resolution performance.

  In addition, it is not necessary to satisfy the condition 1 (preferably Condition 1 and Condition 2) in the entire light source unit 11, and it is sufficient that the condition is satisfied in most regions of the light source unit 11. For example, even when a very small number of blue and red laser elements are arranged at positions far away from the majority of other laser elements, the region containing the majority of laser elements It is sufficient that the condition is satisfied.

(Modification)
Each of the red laser element 11R, the green laser element 11G, and the blue laser element 11B may emit light of each wavelength region by the semiconductor itself, or light emitted from the semiconductor may be converted to each wavelength region by the wavelength conversion element. It may be emitted after being converted into light.

  In the present embodiment (FIG. 1), the light source unit 11 using six blue laser elements 11B, eight green laser elements 11G, and eight red laser elements 11R has been described. However, this is merely an example, and the number of each color laser element can be arbitrarily selected according to the luminance and color balance required for the image projection apparatus.

  Although not shown in the figure, a light beam collimating element that converts a light beam from a plurality of laser elements into a parallel light beam or a light beam diverging element that converts a light beam from a plurality of laser elements into a divergent light beam may be provided. Good. This makes it possible to correct the divergence characteristics of the individual laser elements and increase the degree of freedom in selecting the laser elements.

  Furthermore, in this embodiment, the case where a single spatial light modulation element 14 is used has been described. However, a spatial light modulation element 14 may be provided for each of R, G, and B colors. In this case, the R light, G light, and B light from the illumination optical system 13 are separated and guided to each spatial light modulation element 14, and the R light, G light, and B light from each spatial light modulation element 14 are combined. A color separation / synthesis system leading to the projection optical system 15 may be provided.

  In the first embodiment, the case where laser elements are radially arranged in eight directions has been described. However, other arrangements such as a concentric arrangement and a random arrangement may be adopted as long as the arrangement satisfies the above conditions. .

  About the above modification, it is the same also in the other Example mentioned later.

  FIG. 4 shows a light source unit used in an image projection apparatus that is Embodiment 2 of the present invention as viewed from the illumination optical system side. Note that the optical system of the image projection apparatus of the present embodiment basically has the same configuration as the optical system shown in the first embodiment (FIG. 2). For this reason, also in the present embodiment, the same reference numerals as those used in the first embodiment are assigned to the components of the optical system.

  In the light source unit 11 ′, a plurality of semiconductor laser elements (hereinafter simply referred to as laser elements) 11R, 11G, and 11B as solid laser light emitting elements (laser light sources) that emit light in different wavelength regions are arranged. Yes. The red laser element 11R emits light R in the red wavelength region, and the green laser element 11G emits light G in the green wavelength region. The blue laser element 11B emits light B in the blue wavelength region.

  The semiconductor laser elements of each color are arranged in an array as shown in FIG. The first group of the blue laser elements 11B is disposed near the center O of the light source unit 11 ′. The first group of the green laser elements 11G is arranged so as to surround the outside of the first group of the blue laser elements 11B. Furthermore, the first group of red laser elements 11R is arranged so as to surround the outside of the first group of green laser elements 11G.

The second group of the blue laser elements 11B is arranged so as to surround the outside of the first group of the red laser elements 11R. The second group of the green laser elements 11G is arranged so as to surround the outside of the second group of the blue laser elements 11B. Further, the second group of red laser elements 11R is arranged so as to surround the outside of the second group of green laser elements 11G.
In this way, the laser elements 11B, 11G, and 11R that emit light in different wavelength regions from the outer peripheral side to the center side of the light source unit 11, respectively, move from the laser element 11R in the longer wavelength side to the shorter wavelength side. The laser elements 11B in the wavelength region are repeatedly arranged in this order.

  A plurality of light beams from the laser elements 11R, 11G, and 11B are superimposed on each other on the modulation surface of the spatial light modulation element 14 by the condensing action of the condenser lens included in the illumination optical system 13. Thereby, Koehler illumination is performed on the modulation surface of the spatial light modulation element 14, and the modulation surface is uniformly illuminated so that luminance unevenness of each color light does not occur.

  FIG. 5 shows an illuminance distribution on the diaphragm surface 16 in the present embodiment. Similar to the first embodiment, the light source unit 11 ′ and the diaphragm surface 16 are arranged at conjugate positions by the illumination optical system 13 and the projection optical system 15. For this reason, the illuminance distribution on the diaphragm surface 16 is a distribution corresponding to (similar to) the arrangement of the laser elements on the light source unit 11 ′. That is, the light beam diameters of the three color lights of R, G, and B are different from each other on the diaphragm surface 16.

When the F value (Fno) of the projection optical system 15 for each of R light, G light, and B light is FR, FG, FB,
FR <FG <FB
The relationship holds.

  By configuring as described above, the potential of the projection optical system 15 having a finite optical element can be used in a region near the diffraction limit.

  In this embodiment, the blue laser element 11B and the red laser element 11R are arranged so as to satisfy the following condition 3.

(Condition 3) Lλ1 <Lλ2
However, Lλ1 is a distance from the center O of the light source unit 11 ′ to the blue laser element 11B arranged farthest among the plurality of blue laser elements 11B. Lλ2 is the distance from the center O of the light source unit 11 ′ to the red laser element 11R disposed farthest from the plurality of red laser elements 11R.
Furthermore, in this embodiment, the blue, green, and red laser elements 11B, 11G, and 11R are arranged farthest from the center O of the light source unit 11 ′ among the plurality of laser elements that emit light in the same wavelength region. The distance to the laser light source is arranged such that the longer the wavelength region is on the longer wavelength side (in order of blue, green and red).

  Furthermore, in this embodiment, the blue laser element 11B and the red laser element 11R are arranged so as to satisfy the following condition 4.

(Condition 4) 1.2 <Lλ2 / Lλ1 <1.6
By arranging the blue laser element 11B and the red laser element 11R so as to satisfy the condition 3 (preferably the condition 3 and the condition 4), it is possible to appropriately match the F value of the projection optical system 15 and the resolution performance. It becomes. For this reason, when using the illumination optical system 13 that performs Koehler illumination as in the present embodiment, it is possible to achieve both reduction in size of the projection optical system 15 and resolution performance.

  Further, the uneven color of the projected image can be reduced by improving the color balance on the light source unit 11 ′. Furthermore, since the wavelength distribution at the pupil position of the projection optical system 15 becomes more uniform than in the first embodiment, the resolution performance of the projection optical system 15 can be further improved.

  Note that it is not necessary to satisfy the condition 3 (preferably the conditions 3 and 4) in the entire light source unit 11 ′, and it is sufficient to satisfy the condition in the most area of the light source unit 11 ′. For example, even when a very small number of blue and red laser elements are arranged at positions far away from the majority of other laser elements, the region containing the majority of laser elements It is sufficient that the condition is satisfied.

  In the present embodiment, a case has been described in which the laser elements 11B, 11G, and 11R of each color are divided into the first group and the second group, and the arrangement of the laser elements in the order of B, G, and R is repeated twice. Many more repeated arrangements may be made.

  FIG. 6 shows a light source unit used in an image projection apparatus that is Embodiment 3 of the present invention as viewed from the illumination optical system side. Note that the optical system of the image projection apparatus of the present embodiment basically has the same configuration as the optical system shown in the first embodiment (FIG. 2). For this reason, also in the present embodiment, the same reference numerals as those used in the first embodiment are assigned to the components of the optical system.

  In the light source unit 11 ″, a plurality of semiconductor laser elements (hereinafter simply referred to as laser elements) 11R, 11G, 11B, and 11C as solid laser light emitting elements (laser light sources) that emit light in different wavelength regions are arranged. The red laser element 11R emits light R in the red wavelength region, the green laser element 11G emits light G in the green wavelength region, and the blue laser element 11B emits light B in the blue wavelength region, and is cyan. The laser element 11C emits light C in the cyan wavelength region.

  The semiconductor laser elements of each color are arranged in an array as shown in FIG. The blue laser element 11B is disposed near the center O of the light source unit 11 ″. The cyan laser element 11C is disposed so as to surround the blue laser element 11B. The green laser element 11G is cyan. The red laser element 11R is disposed so as to surround the outer side of the green laser element 11G.

  A plurality of light beams from the laser elements 11R, 11G, 11B, and 11C are superimposed on each other on the modulation surface of the spatial light modulation element 14 by the condensing action of the condenser lens included in the illumination optical system 13. Thereby, Koehler illumination is performed on the modulation surface of the spatial light modulation element 14, and the modulation surface is uniformly illuminated so that luminance unevenness of each color light does not occur.

  The illuminance distribution on the diaphragm surface 16 is a distribution corresponding to (similar to) the arrangement of the laser elements on the light source unit 11 ″ as in FIG. 3. That is, on the diaphragm surface 16, R, G, B, The light diameters of the four color lights of C are different from each other.

  Also in this embodiment, the blue laser element 11B that emits B light in the shortest wavelength region λ1 among R, G, B, and C is arranged on the inner periphery (near the center O) of the light source unit 11 ″, and the longest wavelength is obtained. A red laser element 11 </ b> R that emits R light in the region λ <b> 2 is disposed on the outer periphery of the light source unit 11.

  In other words, the blue laser element 11B and the red laser element 11R are arranged so as to satisfy the condition 1 described in the first embodiment (preferably also the condition 2).

  By configuring the light source unit 11 ″ as described above, it is possible to obtain the same effect as in the embodiment 1. Further, by using the four-color laser elements, the color reproducibility and luminance of the projected image are improved. be able to.

  In this embodiment, four color laser elements are used. However, five or more color laser elements may be used.

  Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.

1 is a front view of a light source unit used in an image projection apparatus that is Embodiment 1 of the present invention. FIG. 3 is a diagram illustrating a configuration of an optical system of the image projection apparatus according to the first embodiment. FIG. 3 is an explanatory diagram of illuminance distribution on a diaphragm surface in the image projection apparatus according to the first embodiment. The front view of the light source unit used for the image projector which is Example 2 of this invention. Explanatory drawing of the illumination distribution in the aperture plane in the image projector of Example 2. FIG. The front view of the light source unit used for the image projector which is Example 3 of this invention. The figure which shows MTF of R, G, B in the same F value.

Explanation of symbols

11, 11 ′, 11 ″ Light source unit 11R, 11G, 11B, 11C Semiconductor laser element 13 Illumination optical system 14 Spatial light modulation element 15 Projection optical system 16 Aperture surface

Claims (8)

A light source array including multiple respective Relais chromatography The light source Hassu light of wavelength region that different from each other,
An illumination optical system that performs Koehler illumination of the illuminated surface using light from the light source array;
A spatial light modulator disposed on the illuminated surface for modulating light from the illumination optical system;
A projection optical system that projects light from the spatial light modulation element onto a projection surface;
The light source array includes an area in which an average distance from the center of the light source array to the plurality of laser light sources that emit light in the same wavelength region increases as the wavelength region becomes longer. Projection device. The plurality of laser light sources that emit light in the shortest wavelength region among the different wavelength regions are a plurality of first laser light sources, and the plurality of laser light sources that emit light in the longest wavelength region are a plurality of second laser light sources. and when,
The light source array has a value obtained by dividing the average distance from the center of the light source array to the plurality of second laser light sources by the average distance from the center of the light source array to the plurality of first laser light sources. The image projection apparatus according to claim 1, further comprising an area that is larger and smaller than 1.6 . In the light source array, the distance from the center of the light source array to the laser light source disposed farthest from the plurality of laser light sources that emit light in the same wavelength region becomes larger as the wavelength region is longer wavelength side. The image projection apparatus according to claim 1 , further comprising an area. The light source array emits light in different wavelength regions from the outer peripheral side to the center side of the light source array, and the laser light source emits light in a wavelength region on the short wavelength side from a laser light source in the wavelength region on the long wavelength side. The image projection apparatus according to claim 3, further comprising an area that is repeatedly arranged in the order of the laser light source . When the plurality of laser light sources in the shortest wavelength region among the different wavelength regions are a plurality of first laser light sources, and the plurality of laser light sources in the longest wavelength region are a plurality of second laser light sources,
The light source array has a distance from a center of the light source array among the plurality of second laser light sources to a second laser light source disposed farthest from a center of the light source array. 5. The image projection apparatus according to claim 3, wherein the image projection apparatus includes a region in which a value obtained by dividing by a distance to the first laser light source disposed far is larger than 1.2 and smaller than 1.6 . 6. The image projection according to claim 1, wherein the laser light sources having different wavelength regions include laser light sources that respectively emit light in a red wavelength region, a green wavelength region, and a blue wavelength region. apparatus. The image projection apparatus according to claim 6, further comprising a laser light source that emits light in a cyan wavelength region as the laser light sources in different wavelength regions . An image projection device according to any one of claims 1 to 7,
An image display system comprising: an image supply device that supplies image information to the image projection device.