Light source device and projection type image display device

Abstract

To provide a light source device that can reduce size of a device without being affected by size increase of a cooling mechanism of a solid light source, and a projection type video display device with the light source device.SOLUTION: A light source device according to the present invention includes: a first solid light source array for emitting first color light; a second solid light source array for emitting second color light; a third solid light source array for emitting third color light; and a light synthesis unit for synthesizing first to third color light from the first to third solid light source arrays and emitting light fluxes of the synthesized first to third color light in the same direction. On the basis of an optical axis of the light fluxes emitted from the light synthesis unit, the third solid light source array of the first to third solid light source arrays, which needs the lowest target cooling temperature, is arranged in one side while the first and second solid light source arrays are arranged on the other side.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a light source device including a solid-state light source and a light combining section that combines colored light emitted from the solid-state light source, and to a projection-type image display device including such a light source device. [Background technology]

[0002] Patent Document 1 discloses a projection-type image display device that uses a collimating lens to combine the light emitted from each light source in a solid-state light source projector system equipped with multiple laser light sources in order to achieve compact size and high light utilization efficiency. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-102901 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a light source device that can be made smaller without being affected by the increase in size of a cooling mechanism for a solid-state light source, and a projection-type image display device that includes such a light source device. [Means for solving the problem]

[0005] The light source device according to the present disclosure includes a first solid-state light source array that emits a first color light, a second solid-state light source array that emits a second color light, a third solid-state light source array that emits a third color light, and a light combining unit that combines the first to third color lights from the first to third solid-state light source arrays and emits a luminous flux of the combined first to third color lights in the same direction. The third solid-state light source array, which requires the lowest target cooling temperature among the first to third solid-state light source arrays, is arranged on one side of the optical axis of the luminous flux emitted from the light combining unit, and the first and second solid-state light source arrays are arranged on the other side. Effect of the Invention

[0006] The light source device according to the present disclosure is not restricted by a cooling mechanism and can be made smaller, which in turn allows a projection-type image display device including such a light source device to be made smaller. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 shows a projection-type image display device according to a first embodiment. [Diagram 2] FIG. 1 shows a light source device according to a first embodiment. [Diagram 3] FIG. 1 shows a solid-state light source array according to a first embodiment. [Figure 4] FIG. 1 is a diagram showing a light flux distribution after emission from the light source device according to the first embodiment. [Figure 5A] FIG. 1 is a diagram showing characteristics of a half mirror according to the first embodiment. [Figure 5B] 1 is a characteristic diagram of the dichroic mirror 140 according to the first embodiment. [Figure 5C] A characteristic diagram of the dichroic mirrors 141 and 142 according to the first embodiment. [Figure 5D] A characteristic diagram of the dichroic mirror 143 according to the first embodiment. [Figure 6] FIG. 1 shows a light source device using an integrated cooling mechanism according to the first embodiment. [Figure 7] FIG. 13 shows a light source device according to a second embodiment. [Figure 8] FIG. 13 shows a light source device according to a third embodiment. [Figure 9] FIG. 13 shows a light source device according to a fourth embodiment. [Figure 10] FIG. 13 shows a light source device according to a fifth embodiment. [Figure 11] FIG. 13 shows a projection type image display device according to a sixth embodiment. [Figure 12] FIG. 13 shows a light source device according to a sixth embodiment. [Figure 13] A characteristic diagram of the dichroic mirror 144 in the sixth embodiment. [Figure 14] A characteristic diagram of the polarizing beam splitter 145 in the sixth embodiment. [Figure 15] A characteristic diagram of the polarizing beam splitter 146 according to the sixth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, the embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

[0009] It should be noted that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0010] [Embodiment 1] (Projection type image display device) The configuration of the projection-type image display device according to the first embodiment will be described below with reference to Fig. 1. Fig. 1 is a diagram showing the optical configuration of a projection-type image display device 100 according to the first embodiment.

[0011] As shown in FIG. 1, first, a projection-type image display device 100 has a light source device 10 including a first solid-state light source array 10A, a second solid-state light source array 10B1, 10B2, and a third solid-state light source array 10C1, 10C2, a rod integrator 30, three DMDs (digital micromirror devices) 40R, 40G, 40B, and a projection unit 50.

[0012] The first solid-state light source array 10A, the second solid-state light source arrays 10B1 and 10B2, and the third solid-state light source arrays 10C1 and 10C2 are composed of solid-state light sources such as laser diodes (LD) and light-emitting diodes (LED). In this embodiment, laser diodes are used as the solid-state light sources, and in particular, the first solid-state light source array 10A uses a laser diode that emits blue light (first color light), the second solid-state light source arrays 10B1 and 10B2 uses a laser diode that emits green light (second color light), and the third solid-state light source arrays 10C1 and 10C2 uses a laser diode that emits red light (third color light). Here, the laser diode is an example of a laser light source. Details of the first solid-state light source array 10A, the second solid-state light source arrays 10B1 and 10B2, and the third solid-state light source arrays 10C1 and 10C2 will be described later (see FIG. 3).

[0013] Rod integrator 30 is a solid rod made of a transparent material such as glass. Rod integrator 30 homogenizes the light emitted from light source device 10. Note that rod integrator 30 may be a hollow rod whose inner wall is made of a mirror surface. Here, rod integrator 30 is an example of a light homogenizing element.

[0014] The DMDs 40B, 40G, and 40R modulate the light emitted from the first solid-state light source array 10A, the second solid-state light source arrays 10B1 and 10B2, and the third solid-state light source arrays 10C1 and 10C2, respectively, based on a video signal. In detail, the DMDs 40B, 40G, and 40R are composed of a plurality of micromirrors, which are movable. Each micromirror basically corresponds to one pixel. The DMDs 40B, 40G, and 40R switch whether or not to reflect light toward the projection unit 50 by changing the angle of each micromirror.

[0015] The DMD 40R modulates red component light R based on a red video signal. The DMD 40G modulates green component light G based on a green video signal. The DMD 40B modulates blue component light B based on a blue video signal. The DMDs 40R, 40G, and 40B are light modulation elements and are an example of an image light generation unit.

[0016] The projection unit 50 enlarges and projects the image light modulated by the DMDs 40R, 40G, and 40B onto a projection surface. The projection unit 50 is an example of a projection optical system.

[0017] Secondly, the projection-type image display device 100 has a necessary lens group and mirror group. The lens group includes lenses 121-125, and the mirror group includes a mirror 13, a half mirror 14, a mirror 131, and dichroic mirrors 140-143. The projection-type image display device 100 also has a necessary diffusion plate 20.

[0018] Lenses 121 and 122 are condenser lenses that collect the light emitted from first solid-state light source array 10A, second solid-state light source arrays 10B1 and 10B2, and third solid-state light source arrays 10C1 and 10C2, and guide them to rod integrator 30. Lenses 123, 124, and 125 are relay lenses that approximately image the light emitted from rod integrator 30 on each of DMDs 40R, 40G, and 40B.

[0019] The mirrors 13 and 131 are mirrors that bend the optical path. The half mirror 14 is a mirror that separates the light emitted from the first solid-state light source array 10A, reflects a part of the light beam, and transmits the remaining light beam. The dichroic mirror 140 is a dichroic mirror that transmits blue light and reflects green light. The dichroic mirror 141 is a dichroic mirror that transmits blue light and green light, and reflects red light. The dichroic mirror 142 is a dichroic mirror that transmits blue light and reflects red light. The dichroic mirror 143 is a dichroic mirror that transmits blue light and red light, and reflects green light. The half mirror 14, the mirror 13, and the dichroic mirrors 140 to 143 are examples of optical elements that configure the light combining unit. Details of the dichroic mirrors will be described later (see FIGS. 5A to 5D).

[0020] The diffusion plate 20 is disposed near the focal point of the light beam by the lens 122, and diffuses the light beam. The diffusion plate 20 is configured, for example, with fine irregularities formed on the surface of a glass substrate. The fine irregularities may be formed on one side or both sides.

[0021] Thirdly, the projection display device 100 has a necessary prism group. As the prism group, prisms 210, 220, 230, 240, and 250 are provided.

[0022] Prism 210 is made of a light-transmitting member and has surfaces 211 and 212. An air gap is provided between prism 210 (surface 211) and prism 250 (surface 251), and the angle (incident angle) at which light incident on prism 210 is incident on surface 211 is larger than the total reflection angle, so the light incident on prism 210 is reflected by surface 211. On the other hand, an air gap is provided between prism 210 (surface 212) and prism 220 (surface 221), but the angle (incident angle) at which light reflected on surface 211 is incident on surface 212 is smaller than the total reflection angle, so the light reflected on surface 211 passes through surface 212.

[0023] The prism 220 is made of a light-transmitting member, and has a surface 221 and a surface 222. The surface 222 is a dichroic mirror surface that transmits red component light R and green component light G and reflects blue component light B. Therefore, of the light reflected by the surface 211, the red component light R and green component light G transmit through the surface 222, and the blue component light B is reflected by the surface 222. The blue component light B reflected by the surface 222 is reflected by the surface 221.

[0024] An air gap is provided between the prism 210 (surface 212) and the prism 220 (surface 221). Since the angle (incident angle) at which the blue component light B first reflected by the surface 222 and the blue component light B emitted from the DMD 40B are incident on the surface 221 is larger than the total reflection angle, the blue component light B first reflected by the surface 222 and the blue component light B emitted from the DMD 40B are reflected by the surface 221. The blue component light B reflected by the surface 222 is reflected by the surface 221 and incident on the DMD 40B, and the DMD 40B reflects this incident light and emits it as output light. On the other hand, since the angle (incident angle) at which the blue component light B reflected a second time by the surface 222 after being reflected by the surface 221 is incident on the surface 221 is smaller than the total reflection angle, the blue component light B reflected a second time by the surface 222 after being reflected by the surface 221 passes through the surface 221.

[0025] The prism 230 is made of a light-transmitting member, and has a surface 231 and a surface 232. The surface 232 is a dichroic mirror surface that transmits green component light G and reflects red component light R. Therefore, of the light that transmits through the surface 231, the green component light G transmits through the surface 232, and the red component light R is reflected by the surface 232. The red component light R reflected by the surface 232 is reflected by the surface 231. The green component light G emitted from the DMD 40G transmits through the surface 232.

[0026] An air gap is provided between prism 220 (surface 222) and prism 230 (surface 231), and the angle (incident angle) at which red component light R transmitted through surface 231 and reflected by surface 232 and red component light R emitted from DMD 40R are incident again on surface 231 is larger than the total reflection angle, so that red component light R transmitted through surface 231 and reflected by surface 232 and red component light R emitted from DMD 40R are reflected by surface 231. The red component light R reflected by surface 232 is reflected by surface 231 and enters DMD 40R, and DMD 40R reflects this incident light and emits it as outgoing light. On the other hand, since the angle (incident angle) at which the red component light R emitted from DMD 40R, reflected by surface 231, and then reflected by surface 232 is incident again on surface 231 is smaller than the total reflection angle, the red component light R emitted from DMD 40R, reflected by surface 231, and then reflected by surface 232 is transmitted through surface 231.

[0027] The prism 240 is made of a light-transmitting member and has a surface 241. The surface 241 is configured to transmit green component light G. Note that the green component light G incident on the DMD 40G and the green component light G emitted from the DMD 40G transmit through the surface 241.

[0028] The prism 250 is made of a light-transmitting material and has a surface 251 .

[0029] In other words, the blue component light B is (1) reflected by surface 211, (2) transmitted through surfaces 212 and 221, then reflected by surface 222, (3) reflected by surface 221, (4) reflected by DMD 40B, (5) reflected by surface 221, (6) reflected by surface 222, and (7) transmitted through surfaces 221, 212, 211, and 251. As a result, the blue component light B is modulated by DMD 40B and guided to the projection unit 50.

[0030] The red component light R is (1) reflected by the surface 211, (2) transmitted through the surfaces 212, 221, 222, and 231, and then reflected by the surface 232, (3) reflected by the surface 231, (4) reflected by the DMD 40R, (5) reflected by the surface 231, (6) reflected by the surface 232, and (7) transmitted through the surfaces 231, 222, 221, 212, 211, and 251. As a result, the red component light R is modulated by the DMD 40R and guided to the projection unit 50.

[0031] The green component light G is (1) reflected by the surface 211, (2) transmitted through the surfaces 212, 221, 222, 231, 232, and 241, and then reflected by the DMD 40G, and (3) transmitted through the surfaces 241, 232, 231, 222, 221, 212, 211, and 251. As a result, the green component light G is modulated by the DMD 40G and guided to the projection unit 50.

[0032] (Light source device) The light source device according to the first embodiment will be described below with reference to Fig. 2 to Fig. 5D. Fig. 2 is a diagram showing a light source device 10 according to the first embodiment.

[0033] In the first embodiment, the light source device 10 used in the projection-type image display device shown in FIG. 1 is mainly composed of a first solid-state light source array 10A, second solid-state light source arrays 10B1 and 10B2, third solid-state light source arrays 10C1 and 10C2, a half mirror 14, a mirror 13, and dichroic mirrors 140 to 143.

[0034] As will be described in detail later, the first solid-state light source array is a blue solid-state light source array including a blue laser diode that emits blue light, which is a first color light, the second solid-state light source array is a green solid-state light source array including a green laser diode that emits green light, which is a second color light, and the third solid-state light source array is a red solid-state light source array including a red laser diode that emits red light, which is a third color light. That is, the green solid-state light source array is composed of the second solid-state light source array 10B1 which is the first green solid-state light source array and the second solid-state light source array 10B2 which is the second green solid-state light source array, and the red solid-state light source array is composed of the third solid-state light source array 10C1 which is the first red solid-state light source array and the third solid-state light source array 10C2 which is the second red solid-state light source array.

[0035] As shown in FIG. 2, with respect to the optical axis A of the light beam L emitted from the light combining section consisting of the half mirror 14, the mirror 13, and the dichroic mirrors 140 to 143, the third solid-state light source array 10C1 and the third solid-state light source array 10C2 are arranged with a center distance d1 on one side, and the first solid-state light source array 10A and the second solid-state light source array 10B1, and the second solid-state light source array 10B1 and the second solid-state light source array 10B2 are each arranged with a center distance d1 on the other side.

[0036] Second solid-state light source array 10B1 and third solid-state light source array 10C1 are disposed so as to face each other directly, and second solid-state light source array 10B2 and third solid-state light source array 10C2 are disposed so as to face each other directly.

[0037] The blue light emitted from the first solid-state light source array 10A and reflected by the half mirror 14, the green light emitted from the second solid-state light source array 10B1, and the red light emitted from the third solid-state light source array 10C2 are combined by a dichroic mirror 140 (first dichroic mirror) that reflects the green light and transmits the blue light and a dichroic mirror 141 (second dichroic mirror) that reflects the red light and transmits the blue and green lights, and are emitted in the same direction as a white light beam LA and travel along the first optical path 17A.

[0038] The blue light emitted from the first solid-state light source array 10A, which passes through the half mirror 14 and is reflected by the mirror 13 (first mirror), the green light emitted from the second solid-state light source array 10B2, and the red light emitted from the third solid-state light source array 10C1 are combined by a dichroic mirror 142 (third dichroic mirror) that reflects the red light and transmits the blue light and a dichroic mirror 143 (fourth dichroic mirror) that reflects the green light and transmits the blue and red lights, and are emitted in the same direction as a white light beam LB and travel along the second optical path 17B.

[0039] At this time, the optical axis A of the light beam LA LA and the optical axis A of the light beam LB LB The positions of the half mirror 14, the mirror 13, and the dichroic mirrors 140 to 143 are adjusted and arranged so that d1>d2, where d1 is the center distance between the light beam LA traveling on the first optical path 17A and the light beam LB traveling on the second optical path 17B. As a result, the center distance d2 between the light beam LA traveling on the first optical path 17A and the light beam LB traveling on the second optical path 17B is narrower than the center distance d1 between the colored lights emitted from the adjacently arranged solid-state light source arrays (the second solid-state light source arrays 10B1 and 10B2, or the third solid-state light source arrays 10C1 and 10C2). Note that, although the center distance d1 of the solid-state light source arrays is a common value in this embodiment, it can be adjusted as appropriate.

[0040] The light source device 10 also includes a necessary cooling mechanism group. The cooling mechanism group is composed of a cooling mechanism 11A provided next to the first solid-state light source array 10A, a cooling mechanism 11B1 provided next to the second solid-state light source array 10B1, a cooling mechanism 11B2 provided next to the second solid-state light source array 10B2, a cooling mechanism 11C1 provided next to the third solid-state light source array 10C1, and a cooling mechanism 11C2 provided next to the third solid-state light source array 10C2.

[0041] Cooling mechanism 11A, cooling mechanism 11B1, and cooling mechanism 11B2 are cooling mechanisms for respectively cooling first solid-state light source array 10A, second solid-state light source array 10B1, and second solid-state light source array 10B2 that can be used under high temperature conditions where the laser case temperature is 50° C. to 70° C. Here, being usable under high temperature conditions where the laser case temperature is 50° C. to 70° C. means that the laser case temperature of each solid-state light source array is set to 50° C. to 70° C. as the target cooling temperature of first solid-state light source array 10A, second solid-state light source array 10B1, and 10B2.

[0042] On the other hand, the cooling mechanism 11C1 and the cooling mechanism 11C2 are cooling mechanisms for cooling the third solid-state light source array 10C1 and the third solid-state light source array 10C2, which need to be used under low-temperature conditions with a laser case temperature of 20°C to 40°C, respectively, and are provided in addition to the third solid-state light source array 10C1 and the third solid-state light source array 10C2, sandwiching the Peltier element 12C1 and the Peltier element 12C2 provided for further cooling. Here, the need to use under low-temperature conditions with a laser case temperature of 20°C to 40°C means that the laser case temperature of each solid-state light source array is set to 20°C to 40°C as the target cooling temperature of the third solid-state light source array 10C1 and 10C2. Therefore, in this embodiment, the third solid-state light source array 10C1 and 10C2 are the light source arrays that require the lowest target cooling temperature among the first to third solid-state light source arrays. The cooling mechanism group is bonded to the rear surface of the first solid-state light source array, the second solid-state light source array, or the third solid-state light source array arranged side by side, for example, via thermally conductive grease, etc. The cooling mechanism group is an example of a cooling device.

[0043] 3(a) is a view of the first solid-state light source array 10A viewed in the +x direction of FIG. 2, FIG. 3(b) is a view of the second solid-state light source arrays 10B1 and 10B2 viewed in the +x direction of FIG. 2, and FIG. 3(c) is a view of the third solid-state light source arrays 10C1 and 10C2 viewed in the -x direction of FIG. 2.

[0044] The first solid-state light source array 10A includes a plurality of laser diodes 16A that emit blue light (first color light) with a dominant wavelength of 465 nm, the second solid-state light source arrays 10B1 and 10B2 include a plurality of laser diodes 16B that emit green light (second color light) with a dominant wavelength of 525 nm, and the third solid-state light source arrays 10C1 and 10C2 include a plurality of laser diodes 16C that emit red light (third color light) with a dominant wavelength of 640 nm. Note that the blue light may have a wavelength in the range of 440 to 470 nm, the green light may have a wavelength in the range of 515 to 550 nm, and the red light may have a wavelength in the range of 630 to 660 nm, or multiple wavelengths within the above ranges may be used.

[0045] Blue and green laser diodes have relatively good temperature characteristics, and can maintain reliability even under high temperature conditions with a case temperature of 50 to 70°C, and the decrease in optical output is relatively small. On the other hand, red laser diodes have poor temperature characteristics, and it is difficult to maintain reliability under high temperature conditions, and the optical output decreases, so it is necessary to keep the case temperature at 20 to 40°C. The first solid-state light source array 10A, the second solid-state light source arrays 10B1 and 10B2, and the third solid-state light source arrays 10C1 and 10C2 are configured to have a total of 24 laser diodes 16A, 16B, and 16C arranged, four in the horizontal direction and six in the vertical direction. The laser diodes 16A, 16B, and 16C include emitters 18A, 18B, and 18C that emit light, respectively, and are integrated with collimating lenses that collimate the emitted light, and the laser diodes 16A, 16B, and 16C emit approximately parallel light.

[0046] The emitters 18A, 18B, and 18C are arranged so that the x-axis direction is the short side and the y-axis direction is the long side, with the x-axis direction being the fast axis and the y-axis direction being the slow axis. By making the long side direction of the image of the emitter on the entrance surface of the rod integrator 30 the same as the long side direction of the rod integrator 30, the light beam can be more efficiently incident into the rod integrator. The first solid-state light source array 10A that emits blue color light (first color light) and the second solid-state light source arrays 10B1 and 10B2 that emit green color light (second color light) have a slow axis direction, i.e., a y axis direction, as the polarization direction, and the third solid-state light source arrays 10C1 and 10C2 that emit red color light (third color light) have a fast axis direction, i.e., an x ​​axis direction, as the polarization direction. The number and arrangement of the laser diodes 16A, 16B, and 16C included in the solid-state light source array are not limited to this.

[0047] 4 is a diagram showing the arrangement of light beams L incident on lens 121, and light beams L include light beams LA traveling through first optical path 17A and light beams LB traveling through second optical path 17B. Light beams LA and LB include emitter images 19 of (a) to (c) in FIG. 3, and each emitter image 19 is a white image in which blue light (first color light), green light (second color light), and red light (third color light) are combined. Note that the number and arrangement of laser diodes 16A, 16B, and 16C included in the solid-state light source array are not limited to those shown in FIG. 3, and therefore the emitter images 19 shown in FIG. 4 may also be arranged such that the images of the emitters of blue light, green light, and red light do not overlap.

[0048] Fig. 6 is a diagram showing the configuration of a light source device 101 in which the cooling mechanisms 11A, 11B1, 11B2, 11C1, and 11C2 in the light source device 10 shown in Fig. 2 are replaced with large cooling mechanisms 11D and 11E. The cooling mechanism 11D is arranged so as to be adjacent to the first solid-state light source array 10A and the second solid-state light source arrays 10B1 and 10B2 arranged on one side of the optical axis A, and cools the three solid-state light source arrays at once. The cooling mechanism 11E is a cooling mechanism that cools the third solid-state light source arrays 10C1 and 10C2 arranged on the other side of the optical axis A at once, and is arranged adjacent to the third solid-state light source arrays 10C1 and 10C2 with a Peltier element 12E sandwiched therebetween. The cooling mechanism 11D is a cooling mechanism whose target cooling temperature is a laser case temperature of 50° C. to 70° C., which is the operating temperature of the first solid-state light source array 10A and the second solid-state light source arrays 10B1 and 10B2, and the cooling mechanism 11E is a cooling mechanism whose target cooling temperature is a laser case temperature of 30° C. to 40° C., which is the operating temperature of the third solid-state light source arrays 10C1 and 10C2. Note that the configuration of the cooling mechanism group using the cooling mechanisms 11D and 11E can also be used in the configurations of the second to sixth embodiments described below.

[0049] 5A to 5D are characteristic diagrams showing the transmission characteristics when light is incident on the half mirror and the dichroic mirror at an incident angle of 45°. Fig. 5A is a characteristic diagram of the half mirror 14, which has the characteristic of transmitting 50% of light with a wavelength in the range of 440 nm to 480 nm and reflecting 50% of the s-polarized incident light. In the light source device 10, the half mirror 14 transmits 50% and reflects 50% of the s-polarized blue light (first colored light) with a wavelength of 465 nm emitted from the first solid-state light source array 10A.

[0050] 5B is a characteristic diagram of dichroic mirror 140, which has the characteristic of transmitting light with a wavelength of 480 nm or less and reflecting light with a wavelength of 510 nm or more for both s-polarized and p-polarized incident light. In light source device 10, dichroic mirror 140 transmits s-polarized blue light (first colored light) with a dominant wavelength of 465 nm emitted from first solid-state light source array 10A and reflects s-polarized green light (second colored light) with a dominant wavelength of 525 nm emitted from second solid-state light source array 10B1.

[0051] 5C is a characteristic diagram of the dichroic mirrors 141 and 142, which have the characteristic that for s-polarized incident light, light with a wavelength of 550 nm or less is transmitted and light with a wavelength of 570 nm or more is reflected, and for p-polarized incident light, light with a wavelength of 574 nm or less is transmitted and light with a wavelength of 594 nm or more is reflected. In the light source device 10, the dichroic mirror 141 transmits s-polarized blue light (first color light) with a dominant wavelength of 465 nm emitted from the first solid-state light source array 10A and s-polarized green light (second color light) with a dominant wavelength of 525 nm emitted from the second solid-state light source arrays 10B1 and 10B2, and reflects p-polarized red light (third color light) with a dominant wavelength of 640 nm emitted from the third solid-state light source array 10C2. In light source device 10, dichroic mirror 142 transmits s-polarized blue light with a dominant wavelength of 465 nm emitted from first solid-state light source array 10A and reflects p-polarized red light with a dominant wavelength of 640 nm emitted from third solid-state light source array 10C1.

[0052] 5D is a characteristic diagram of the dichroic mirror 143, which has the characteristic of transmitting light with wavelengths of 480 nm or less and 630 nm or more for both s-polarized and p-polarized incident light, and reflecting light with wavelengths in the range of 510 nm to 540 nm. In the light source device 10, the dichroic mirror 143 transmits s-polarized blue light (first color light) with a dominant wavelength of 465 nm emitted from the first solid-state light source array 10A, reflects s-polarized green light (second color light) with a dominant wavelength of 525 nm emitted from the second solid-state light source array 10B2, and transmits p-polarized red light (third color light) with a wavelength of 640 nm emitted from the third solid-state light source arrays 10C1 and 10C2. For the dichroic mirror 140, a dichroic mirror having the characteristic of FIG. 5D may be used in order to share the specifications with the dichroic mirror 143.

[0053] Furthermore, when a dichroic mirror having the characteristics of Fig. 5D is used for dichroic mirror 140, white light beams LA and LB can be formed even if the pair of dichroic mirror 140 and dichroic mirror 142 and the pair of dichroic mirror 141 and dichroic mirror 143 are interchanged while maintaining the same angle as in Fig. 1. In this case, beam LA traveling along first optical path 17A is composed of a beam of blue light emitted from first solid-state light source array 10A and reflected by half mirror 14, green light emitted from second solid-state light source array 10B2, and red light emitted from third solid-state light source array 10C1. The light beam LB traveling along the second optical path 17B is composed of a light beam that is transmitted through the half mirror 14 from the blue light emitted from the first solid-state light source array 10A, the green light emitted from the second solid-state light source array 10B1, and the red light emitted from the third solid-state light source array 10C2.

[0054] However, when the dichroic mirrors 140 to 143 are arranged as shown in Fig. 1, it is possible to minimize the difference in optical path length of light of the same color traveling therethrough. That is, it is possible to minimize the optical path length difference between the green light (second colored light) emitted from the second solid-state light source array 10B1 and the green light (second colored light) emitted from the second solid-state light source array 10B2, and the optical path length difference between the red light (third colored light) emitted from the third solid-state light source array 10C1 and the red light (third colored light) emitted from the third solid-state light source array 10C2.

[0055] (Action and Effects) In the first embodiment, the third solid-state light source arrays 10C1 and 10C2 that need to be used under low-temperature conditions are arranged on one side of the optical axis A, and the first solid-state light source array 10A and the second solid-state light source arrays 10B1 and 10B2 that can be used under high-temperature conditions are arranged on the other side. As a result, a cooling mechanism capable of temperature control at low temperatures for cooling the two third solid-state light source arrays is arranged on one side of the optical axis A, and one first solid-state light source array and two second solid-state light source arrays are arranged on the other side, so that a place for installing a large cooling mechanism capable of temperature control at low temperatures can be effectively secured within the projection type image display device. As a result, it is possible to realize the miniaturization of the light source device and the projection type image display device without being restricted by the installation of a large cooling mechanism. In addition, by using a group of mirrors to combine the emitted light from each solid-state light source array, it is possible to make it incident on a small area. The distance between the light beam LA traveling through the first optical path 17A and the light beam LB traveling through the second optical path 17B is narrower than the distance between the colored lights emitted from the adjacent second solid-state light source array 10B1 and the adjacent second solid-state light source array 10B2, or the adjacent third solid-state light source array 10C1 and the adjacent third solid-state light source array 10C2, and the light is incident on a smaller area, thereby improving the light utilization efficiency.

[0056] When using a cooling mechanism integrated on one side, as in light source device 101 shown in FIG. 6, the solid-state light source arrays arranged on both sides of optical axis A are cooled integrally on each side according to the required temperature conditions. This allows the distance between each solid-state light source array to be narrower than in light source device 10 shown in FIG. 2, in which one cooling mechanism is provided for each solid-state light source array, thereby enabling the light source device to be made even more compact.

[0057] [Embodiment 2] The second embodiment will be described below with reference to Fig. 7. In the following, differences from the first embodiment will be mainly described, and since the rest is the same as the first embodiment, the same components are given the same reference numerals and duplicated description will be omitted.

[0058] Fig. 7 is a diagram showing the configuration of the main part of the projection type image display device in the second embodiment, that is, the configuration of the light source device 102, and the configuration after the lens 121 is the same as the configuration in Fig. 1. In the first embodiment, there are three types of dichroic mirrors with different characteristics, dichroic mirrors 140, dichroic mirrors 141, 142, and dichroic mirror 143, but in the second embodiment, there are two dichroic mirrors with two types of characteristics, two dichroic mirrors 140A, 140B, and two dichroic mirrors 141A, 141B. The dichroic mirrors 140A and 140B have the characteristics shown in Fig. 5B, and the dichroic mirrors 141A and 141B have the characteristics shown in Fig. 5C.

[0059] The blue light emitted from the first solid-state light source array 10A and reflected by the half mirror 14, the green light emitted from the second solid-state light source array 10B2, and the red light emitted from the third solid-state light source array 10C2 are combined by a dichroic mirror 140A that reflects the green light and transmits the blue light, and a dichroic mirror 141A that reflects the red light and transmits the blue and green lights, to form a white light beam LA, which travels along the first optical path 17A.

[0060] The blue light emitted from the first solid-state light source array 10A, which passes through the half mirror 14 and is reflected by the mirror 13, the green light emitted from the second solid-state light source array 10B1, and the red light emitted from the third solid-state light source array 10C1 are combined by the dichroic mirror 140B, which reflects the green light and transmits the blue light, and the dichroic mirror 141B, which reflects the red light and transmits the blue and green lights, to form a white light beam LB, which travels along the second optical path 17B.

[0061] In this embodiment, the half mirror 14, the mirror 13, and the dichroic mirrors 140A (first dichroic mirror), 140B (third dichroic mirror), 141A (second dichroic mirror), and 141B (fourth dichroic mirror) configure a light combining unit. Also in this embodiment, as shown in Fig. 7, the third solid-state light source arrays 10C1 and 10C2 are arranged on one side of the optical axis A of the light beam L emitted from the light combining unit, and the first solid-state light source array 10A and the second solid-state light source arrays 10B1 and 10B2 are arranged on the other side.

[0062] In addition, the positions of the third solid-state light source arrays 10C1 and 10C2 are changed according to the change in the arrangement of the dichroic mirror. In the first embodiment, the second solid-state light source array 10B1 and the third solid-state light source array 10C1, and the second solid-state light source array 10B2 and the third solid-state light source array 10C2 are arranged to face each other across the optical axis A, whereas in the second embodiment, the second solid-state light source array 10B2 and the third solid-state light source array 10C1 are arranged to face each other across the optical axis A. Note that in the second embodiment, the second solid-state light source array 10B2 and the third solid-state light source array 10C1 do not necessarily need to face each other across the optical axis A.

[0063] (Action and Effects) In the second embodiment, similarly to the first embodiment, the light utilization efficiency is improved by the compact synthesis of each color light by the mirror group. Also, by separating the installation side of the solid-state light source array according to the required temperature condition, the installation of the cooling mechanism is improved and the light synthesis unit is made compact. In addition, the dichroic mirror that synthesizes the color light emitted from each solid-state light source array is composed of two types of dichroic mirrors: dichroic mirrors 140A and 140B that transmit blue color light (first color light) and reflect green color light (second color light), and dichroic mirrors 141A and 141B that transmit blue color light and green color light and reflect red color light (third color light). This makes it unnecessary to use the dichroic mirror 143 having the characteristics (see FIG. 5D) of a band cut type (blue transmission, green reflection, red transmission) as used in the first embodiment, and has the effect of facilitating the manufacture of the dichroic mirror.

[0064] [Embodiment 3] The third embodiment will be described below with reference to Fig. 8. In the following, differences from the first embodiment will be mainly described, and since the rest is the same as the first embodiment, the same components are given the same reference numerals and duplicated description will be omitted.

[0065] FIG. 8 is a diagram showing the configuration of the main part of the projection type image display device in the third embodiment, that is, the configuration of the light source device 103, and the configuration after the lens 121 is the same as the configuration in FIG. 1. The third embodiment has a dichroic mirror configuration similar to that of the second embodiment, and the third solid-state light source arrays 10C1 and 10C2 are arranged so as to face the second solid-state light source arrays 10B1 and 10B2, respectively. Accordingly, in addition to the half mirror 14 and mirror 13 similar to those of the second embodiment, mirrors 13A and 13B are provided. Note that in the third embodiment, the third solid-state light source arrays 10C1 and 10C2 do not have to be arranged so as to face the second solid-state light source arrays 10B1 and 10B2, respectively.

[0066] The blue light emitted from the first solid-state light source array 10A and reflected by the half mirror 14, the green light emitted from the second solid-state light source array 10B2, and the red light emitted from the third solid-state light source array 10C1 and reflected by the mirrors 13A and 13B are combined by the dichroic mirror 140A, which reflects the green light and transmits the blue light, and the dichroic mirror 141A, which reflects the red light and transmits the blue and green lights, to form a white light beam LA, which travels along the first optical path 17A.

[0067] The blue light emitted from the first solid-state light source array 10A, which passes through the half mirror 14 and is reflected by the mirror 13, the green light emitted from the second solid-state light source array 10B1, and the red light emitted from the third solid-state light source array 10C2 are combined by a dichroic mirror 140B that reflects the green light and transmits the blue light, and a dichroic mirror 141B that reflects the red light and transmits the blue and green lights, to form a white light beam LB, which travels along the second optical path 17B.

[0068] In this embodiment, the half mirror 14, the mirrors 13 (first mirror), 13A (second mirror), 13B (third mirror), and the dichroic mirrors 140A (first dichroic mirror), 140B (third dichroic mirror), 141A (second dichroic mirror), and 141B (fourth dichroic mirror) constitute a light combining unit. Also in this embodiment, as shown in FIG. 8, the third solid-state light source arrays 10C1 and 10C2 are arranged on one side of the optical axis A of the light beam L emitted from the light combining unit, and the first solid-state light source array 10A and the second solid-state light source arrays 10B1 and 10B2 are arranged on the other side.

[0069] (Action and Effects) In the third embodiment, similarly to the first embodiment, the light utilization efficiency is improved by compactly combining the respective color lights by the mirror group. By dividing the installation side of the solid-state light source array according to the required temperature condition and arranging the solid-state light source array so as to face each other on both sides of the optical axis A, the distance between the solid-state light source array and the lens 121 is widened, making it easier to install a cooling mechanism. Also, similarly to the second embodiment, the dichroic mirror 143 having band-cut type (blue transmission, green reflection, red transmission) characteristics (see FIG. 5D) is not required, which has the effect of facilitating the manufacture of the dichroic mirror.

[0070] [Embodiment 4] The fourth embodiment will be described below with reference to Fig. 9. In the following, differences from the first embodiment will be mainly described, and since the rest is the same as the first embodiment, the same components are given the same reference numerals and duplicated description will be omitted.

[0071] FIG. 9 is a diagram showing the configuration of the main part of the projection type image display device in the fourth embodiment, that is, the configuration of the light source device 104, and the configuration after the lens 121 is the same as the configuration in FIG. 1. In the fourth embodiment, the third solid-state light source array 10C1 is located so as to face the midpoint between the first solid-state light source array 10A and the second solid-state light source array 10B1, and the third solid-state light source array 10C2 is located so as to face the midpoint between the second solid-state light source array 10B1 and the second solid-state light source array 10B2. The fourth embodiment has two dichroic mirrors with two types of characteristics, two dichroic mirrors 142A and 142B and two dichroic mirrors 143A and 143B. The dichroic mirrors 142A and 142B have the characteristics shown in FIG. 5C, and the dichroic mirrors 143A and 143B have the characteristics shown in FIG. 5D.

[0072] The blue light emitted from the first solid-state light source array 10A and reflected by the half mirror 14, the green light emitted from the second solid-state light source array 10B2, and the red light emitted from the third solid-state light source array 10C2 are combined by a dichroic mirror 142A that reflects the red light and transmits the blue light, and a dichroic mirror 143A that reflects the green light and transmits the blue and red lights, to form a white light beam LA, which travels along the first optical path 17A.

[0073] The blue light emitted from the first solid-state light source array 10A, which passes through the half mirror 14 and is reflected by the mirror 13, the green light emitted from the second solid-state light source array 10B1, and the red light emitted from the third solid-state light source array 10C1 are combined by a dichroic mirror 142B that reflects the red light and transmits the blue light, and a dichroic mirror 143B that reflects the green light and transmits the blue and red lights, to form a white light beam LB, which travels along the second optical path 17B.

[0074] In this embodiment, the half mirror 14, the mirror 13, and the dichroic mirrors 142A (first dichroic mirror), 142B (third dichroic mirror), 143A (second dichroic mirror), and 143B (fourth dichroic mirror) configure a light combining unit. Also in this embodiment, as shown in Fig. 9, the third solid-state light source arrays 10C1 and 10C2 are arranged on one side of the optical axis A of the light beam L emitted from the light combining unit, and the first solid-state light source array 10A and the second solid-state light source arrays 10B1 and 10B2 are arranged on the other side.

[0075] (Action and Effects) In the fourth embodiment, similarly to the first embodiment, the light utilization efficiency is improved by compactly combining the respective color lights by the mirror group. Also, by arranging the solid-state light source arrays facing each other around the optical axis A in a staggered manner, it is possible to reduce the size of the light combining section of the light source. Compared to the first embodiment, the distance between the third solid-state light source array 10C1 and the third solid-state light source array 10C2, which need to be used under low-temperature conditions, is widened, which makes it easier to install a cooling mechanism.

[0076] [Embodiment 5] The fifth embodiment will be described below with reference to Fig. 10. In the following, differences from the first embodiment will be mainly described, and since the rest is the same as the first embodiment, the same components are given the same reference numerals and repeated description will be omitted.

[0077] FIG. 10 is a diagram showing the configuration of the main part of the projection type image display device in the fifth embodiment, that is, the configuration of the light source device 105, and the configuration after the lens 121 is the same as the configuration in FIG. 1. The fifth embodiment has two large dichroic mirrors 143C and 141C, and these dichroic mirrors 143C and 141C are cross-arranged to form a cross dichroic mirror. As shown in FIG. 5D, the dichroic mirror 143C has a characteristic of transmitting blue and red light and reflecting green light. As shown in FIG. 5C, the dichroic mirror 141C has a characteristic of transmitting blue and green light and reflecting red light.

[0078] The blue light emitted from the first solid-state light source array 10A and reflected by the half mirror 14, the green light emitted from the second solid-state light source array 10B1 and reflected by the dichroic mirror 143C, and the red light emitted from the third solid-state light source array 10C2, transmitted through the dichroic mirror 143C and reflected by the dichroic mirror 141C are combined to form a white light beam LA, which travels along the first optical path 17A.

[0079] The blue light emitted from the first solid-state light source array 10A, which passes through the half mirror 14 and is reflected by the mirror 13, the green light emitted from the second solid-state light source array 10B2, which passes through the dichroic mirror 141C and is reflected by the dichroic mirror 143C, and the red light emitted from the third solid-state light source array 10C1 and is reflected by the dichroic mirror 141C are combined to form a white light beam LB, which travels along the second optical path 17B.

[0080] In this embodiment, the half mirror 14, the mirror 13, and the dichroic mirrors 143C (first dichroic mirror) and 141C (second dichroic mirror) configure a light combining unit. Also in this embodiment, as shown in Fig. 10, the third solid-state light source arrays 10C1 and 10C2 are arranged on one side of the optical axis A of the light beam L emitted from the light combining unit, and the first solid-state light source array 10A and the second solid-state light source arrays 10B1 and 10B2 are arranged on the other side.

[0081] (Action and Effects) In the fifth embodiment, the number of dichroic mirrors in the light combining section can be reduced. Also, as in the first embodiment, the installation side of the solid-state light source array is divided according to the required temperature conditions, which improves the ease of installation of the cooling mechanism.

[0082] [Embodiment 6] The sixth embodiment will be described with reference to Figures 11 to 15. In the following, differences from the first embodiment will be mainly described, and since the rest is the same as the first embodiment, the same components are given the same reference numerals and duplicated description will be omitted.

[0083] Fig. 11 shows the configuration of a projection type image display device 100A in the sixth embodiment, and Fig. 12 shows the detailed configuration of a light source device 106 of the projection type image display device 100A. The configuration from the lens 121 to the projection unit 50 is the same as that of the projection type image display device 100 shown in Fig. 1. As shown in Fig. 12, the light source device 106 has a first solid-state light source array 10A, second solid-state light source arrays 10B1 and 10B3, third solid-state light source arrays 10C1 and 10C3, two mirrors 13C and 13D, two dichroic mirrors 140C and 144, and two polarizing beam splitters 145 and 146.

[0084] The laser diodes 16A, 16B, and 16C are arranged so that the first solid-state light source array 10A emits s-polarized blue light, the second solid-state light source array 10B1 emits s-polarized green light, the second solid-state light source array 10B3 emits p-polarized green light, the third solid-state light source array 10C1 emits p-polarized red light, and the third solid-state light source array 10C3 emits s-polarized red light.

[0085] The two mirrors 13C and 13D are both total reflection mirrors. Dichroic mirror 140C has the characteristics shown in FIG. 5B, transmitting blue light and reflecting green light. Dichroic mirror 144 has the characteristics shown in FIG. 13, reflecting blue and green light and transmitting red light. Polarizing beam splitter 145 has the characteristics shown in FIG. 14, reflecting s-polarized light and transmitting p-polarized green light. Polarizing beam splitter 146 has the characteristics shown in FIG. 15, reflecting s-polarized light and transmitting p-polarized red light.

[0086] The blue light (s-polarized light) emitted from first solid-state light source array 10A is reflected by mirror 13C, passes through dichroic mirror 140C, is reflected by polarizing beam splitter 145 and dichroic mirror 144, and travels along optical path 17C.

[0087] The green light (s-polarized) emitted from second solid-state light source array 10B1 is reflected by dichroic mirror 140C, polarizing beam splitter 145, and dichroic mirror 144, and travels along optical path 17C. The green light (p-polarized) emitted from second solid-state light source array 10B3 passes through polarizing beam splitter 145, is reflected by dichroic mirror 144, and travels along optical path 17C.

[0088] The red light (p-polarized light) emitted from the third solid-state light source array 10C1 is reflected by the mirror 13D, passes through the polarizing beam splitter 146 and the dichroic mirror 144, and travels along the optical path 17C. The red light (s-polarized light) emitted from the third solid-state light source array 10C3 is reflected by the polarizing beam splitter 146, passes through the dichroic mirror 144, and travels along the optical path 17C.

[0089] In this manner, the blue light emitted from the first solid-state light source array 10A, the green light emitted from the second solid-state light source arrays 10B1 and 10B3, and the red light emitted from the third solid-state light source arrays 10C1 and 10C3 are combined to form a white light beam LC, which travels along the optical path 17C in the +z direction along the optical axis A.

[0090] In this embodiment, two mirrors 13C (first mirror) and 13D (second mirror), two dichroic mirrors 140C (first dichroic mirror) and 144 (second dichroic mirror), and two polarizing beam splitters 145 (first polarizing beam splitter) and 146 (second polarizing beam splitter) constitute the light combining unit. Also in this embodiment, as shown in Fig. 11, the third solid-state light source arrays 10C1 and 10C3 are arranged on one side of the optical axis A of the light beam LC emitted from the light combining unit, and the first solid-state light source array 10A and the second solid-state light source arrays 10B1 and 10B3 are arranged on the other side.

[0091] 12, in the light source device 106 of the present embodiment, a large-sized cooling mechanism 11D is provided in the first solid-state light source array 10A and the second solid-state light source arrays 10B1 and 10B3, and a large-sized cooling mechanism 11E is provided in the third solid-state light source arrays 10C1 and 10C3 via a Peltier element 12E, similar to the light source device 10 (see FIG. 6) described in the first embodiment. Note that instead of the cooling mechanisms 11D and 11E, and the Peltier element 12E, cooling mechanisms 11A, 11B1, 11B2, 11C1, and 11C2, and Peltier elements 12C1 and 12C2 can be used in the same way as in the light source device 10 (see FIG. 2) described in the first embodiment.

[0092] Alternatively, the second solid-state light source array 10B3 may emit s-polarized green light, and a half-wave plate may be disposed on the optical path of the green light between the second solid-state light source array 10B3 and the polarizing beam splitter 145, so that the s-polarized green light emitted from the second solid-state light source array 10B3 is converted to p-polarized light and enters the polarizing beam splitter 145. Similarly, the third solid-state light source array 10C3 may emit p-polarized red light, and a half-wave plate may be disposed on the optical path of the red light between the third solid-state light source array 10C3 and the polarizing beam splitter 146, so that the p-polarized red light emitted from the third solid-state light source array 10C3 is converted to s-polarized light and enters the polarizing beam splitter 146.

[0093] In addition, in this embodiment, the first solid-state light source array 10A may be configured to emit p-polarized blue light, the second solid-state light source array 10B1 may be configured to emit p-polarized green light, the second solid-state light source array 10B3 may be configured to emit s-polarized green light, and the polarizing beam splitter 145 may be configured to reflect the p-polarized light and transmit the s-polarized green light. Similarly, the third solid-state light source array 10C1 may be configured to emit s-polarized red light, the third solid-state light source array 10C3 may be configured to emit p-polarized red light, and the polarizing beam splitter 146 may be configured to transmit the s-polarized light and reflect the p-polarized red light. In this way, in the sixth embodiment, the polarization direction of the laser light emitted from the solid-state light source array and the characteristics of the polarizing beam splitter for the polarized light can be appropriately set.

[0094] (Action and Effects) In the sixth embodiment, the size of the light beam can be halved compared to the light source devices described in the first to fifth embodiments, and the optical system subsequent to the light beam from the light source device can be made smaller. Furthermore, since the size of the light beam can be reduced to about half, the distribution of brightness on the exit pupil of the projection lens of the projection unit is made uniform, which has the effect of reducing speckles. Also, as in the first embodiment, the installation side of the solid-state light source array can be divided according to the required temperature conditions, thereby improving the ease of installation of the cooling mechanism.

[0095] It should be noted that the above-described embodiments are intended to illustrate the technology of the present disclosure, and various modifications, substitutions, additions, omissions, and the like can be made within the scope of the claims or their equivalents. [Industrial Applicability]

[0096] The present disclosure is applicable to projection-type image display devices such as projectors. [Explanation of symbols]

[0097] 10, 101, 102, 103, 104, 105, 106 Light source device 10A 1st solid-state light source array 10B1, 10B2, 10B3 Second solid-state light source array 10C1, 10C2, 10C3 Third solid-state light source array 11A, 11B1, 11B2, 11C1, 11C2, 11D, 11E Cooling mechanism 12C1, 12C2, 12E Peltier elements 13, 13A, 13B, 13C, 13D Mirror 14 Half Mirror 16A, 16B, 16C Laser Diodes 17A 1st optical path 17B 2nd optical path 17C optical path 18A, 18B, 18C Emitters 19 Emitter Statue 20 Diffuser 30 Rod Integrator 40R, 40G, 40B DMD 50 Projection Unit 100, 100A Projection type image display device 121, 122, 123, 124, 125 Lenses 131 Mirror 140, 140A, 140B, 140C, 141, 141A, 141B, 141C, 142, 142A, 142B, 143, 143A, 143B, 143C, 144 Dichroic mirror 145, 146 Polarizing beam splitter 210, 220, 230, 240, 250 Prism 211, 212, 221, 222, 231, 232, 241, 251 sides A optical axis A LA、 A LB optical axis d1, d2 center distance L, LA, LB, LC luminous flux

Claims

1. a first solid-state light source array emitting light of a first color; a second solid-state light source array emitting light of a second color; a third solid-state light source array emitting a third color light; a light combining unit that combines the first to third color lights from the first to third solid-state light source arrays and emits the combined luminous fluxes of the first to third color lights in the same direction; a lens into which the light beams emitted in the same direction by the light combining unit are incident, the first solid-state light source array is a blue solid-state light source array including a blue laser diode that emits blue light, which is a first color light; the second solid-state light source array is a green solid-state light source array including a green laser diode that emits green light, which is a second color light, and is made up of first and second green solid-state light source arrays; the third solid-state light source array is a red solid-state light source array including a red laser diode that emits red light, which is a third color light, and is composed of a first red solid-state light source array and a second red solid-state light source array; With the optical axis of the lens as the boundary, The third solid-state light source array is disposed on one side; the first solid-state light source array and the second solid-state light source array are disposed on the other side; the first green solid-state light source array and the first red solid-state light source array are disposed opposite each other; The second green solid-state light source array and the second red solid-state light source array are disposed opposite each other.

2. 2. The light source device according to claim 1, wherein each of the first to third solid-state light source arrays is provided with a cooling mechanism, and the third solid-state light source array is further provided with a Peltier element for cooling.

3. The photosynthetic unit comprises: a half mirror onto which the blue light from the blue solid-state light source array is incident; a mirror that reflects blue light transmitted through the half mirror; a first dichroic mirror that reflects the green light from the first green solid-state light source array and transmits the blue light reflected by the half mirror; a second dichroic mirror that reflects the red light from the second red solid-state light source array and transmits the blue light and the green light from the first dichroic mirror; a third dichroic mirror that reflects the red light from the first red solid-state light source array and transmits the blue light reflected by the third dichroic mirror; a fourth dichroic mirror that reflects the green light from the second green solid-state light source array and transmits the blue light and the red light from the third dichroic mirror; The light source device according to claim 1 .

4. The photosynthetic unit comprises: a half mirror onto which the blue light from the blue solid-state light source array is incident; a first mirror that reflects blue light transmitted through the half mirror; a second mirror that reflects the red light from the first array of red solid-state light sources; a third mirror that reflects the red light from the second mirror; and a first dichroic mirror that reflects the green light from the second green solid-state light source array and transmits the blue light reflected by the half mirror; a second dichroic mirror that reflects the red light from the third mirror and transmits the blue light and the green light from the first dichroic mirror; a third dichroic mirror that reflects the green light from the first green solid-state light source array and transmits the blue light reflected by the first mirror; a fourth dichroic mirror that reflects the red light from the second red solid-state light source array and transmits the blue light and the green light from the third dichroic mirror; The light source device according to claim 1 .

5. The photosynthetic unit includes: a half mirror onto which the blue light from the blue solid-state light source array is incident; a mirror that reflects blue light transmitted through the half mirror; a first dichroic mirror that reflects the green light from the first and second green solid-state light source arrays, transmits the blue light from the half mirror and the blue light from the mirror, and transmits the red light from the first and second red solid-state light source arrays; a second dichroic mirror that reflects the red light from the first and second red solid-state light source arrays, transmits the blue light from the half mirror and the blue light from the mirror, and transmits the green light from the first and second green solid-state light source arrays, the first dichroic mirror and the second dichroic mirror are cross-arranged to configure a cross dichroic mirror; The light source device according to claim 1 .

6. A first solid-state light source array that emits a first color light; a second solid-state light source array emitting light of a second color; a third solid-state light source array emitting a third color light; a light combining unit that combines the first to third color lights from the first to third solid-state light source arrays and emits the combined luminous fluxes of the first to third color lights in the same direction; a lens into which the light beams emitted in the same direction by the light combining unit are incident, the first solid-state light source array is a blue solid-state light source array including a blue laser diode that emits blue light, which is a first color light; the second solid-state light source array is a green solid-state light source array including a green laser diode that emits green light, which is a second color light, and is made up of first and second green solid-state light source arrays; the third solid-state light source array is a red solid-state light source array including a red laser diode that emits red light, which is a third color light, and is composed of a first red solid-state light source array and a second red solid-state light source array; With the optical axis of the lens as the boundary, The third solid-state light source array is disposed on one side; the first solid-state light source array and the second solid-state light source array are disposed on the other side; The second green solid-state light source array and the first red solid-state light source array are disposed opposite each other.

7. A light source device as described in claim 6, wherein each of the first to third solid-state light source arrays is provided with a cooling mechanism, and the third solid-state light source array is further provided with a Peltier element for cooling.

8. The photosynthetic unit includes: a half mirror onto which the blue light from the blue solid-state light source array is incident; a mirror that reflects blue light transmitted through the half mirror; a first dichroic mirror that reflects the green light from the second green solid-state light source array and transmits the blue light reflected by the half mirror; a second dichroic mirror that reflects the red light from the second red solid-state light source array and transmits the blue light and the green light from the first dichroic mirror; a third dichroic mirror that reflects the green light from the first green solid-state light source array and transmits the blue light reflected by the third dichroic mirror; a fourth dichroic mirror that reflects the red light from the first red solid-state light source array and transmits the blue light and the green light from the third dichroic mirror; The light source device according to claim 6 .

9. A first solid-state light source array that emits a first color light; a second solid-state light source array emitting light of a second color; a third solid-state light source array emitting a third color light; a light combining unit that combines the first to third color lights from the first to third solid-state light source arrays and emits the combined luminous fluxes of the first to third color lights in the same direction; a lens into which the light beams emitted in the same direction by the light combining unit are incident, the first solid-state light source array is a blue solid-state light source array including a blue laser diode that emits blue light, which is a first color light; the second solid-state light source array is a green solid-state light source array including a green laser diode that emits green light, which is a second color light, and is made up of first and second green solid-state light source arrays; the third solid-state light source array is a red solid-state light source array including a red laser diode that emits red light, which is a third color light, and is composed of a first red solid-state light source array and a second red solid-state light source array; With the optical axis of the lens as the boundary, The third solid-state light source array is disposed on one side; the first solid-state light source array and the second solid-state light source array are disposed on the other side; the first red solid-state light source array is disposed at a position directly opposite a midpoint between the blue solid-state light source array and the first green solid-state light source array; the second red solid-state light source array is disposed between and facing the first green solid-state light source array and the second green solid-state light source array. Light source device.

10. A light source device as described in claim 9, wherein each of the first to third solid-state light source arrays is provided with a cooling mechanism, and the third solid-state light source array is further provided with a Peltier element for cooling.

11. The photosynthetic unit includes: a half mirror onto which the blue light from the blue solid-state light source array is incident; a mirror that reflects blue light transmitted through the half mirror; a first dichroic mirror that reflects the red light from the second red solid-state light source array and transmits the blue light from the half mirror; a second dichroic mirror that reflects the green light from the second green solid-state light source array and transmits the blue light and the red light from the first dichroic mirror; a third dichroic mirror that reflects the red light from the first array of red solid-state light sources and transmits the blue light from the third dichroic mirror; a fourth dichroic mirror that reflects the green light from the first green solid-state light source array and transmits the blue light and the red light from the third dichroic mirror; The light source device according to claim 9 .

12. The photosynthetic unit includes: a first mirror that reflects the blue light from the array of blue solid-state light sources; a second mirror that reflects the red light from the first array of red solid-state light sources; a first dichroic mirror that reflects the green light from the first green solid-state light source array and transmits the blue light reflected by the first mirror; a first polarizing beam splitter that transmits the green light from the second green solid-state light source array and reflects the blue light and the green light from the first dichroic mirror; a second polarizing beam splitter that reflects the red light from the second red solid-state light source array and transmits the red light reflected by the second mirror; a second dichroic mirror that reflects the blue light and the green light from the first polarizing beam splitter and transmits the red light from the second polarizing beam splitter; The light source device according to claim 1 .

13. a first solid-state light source array emitting light of a first color; a second solid-state light source array emitting light of a second color; a third solid-state light source array emitting a third color light; a light combining unit that combines the first to third color lights from the first to third solid-state light source arrays and emits the combined luminous fluxes of the first to third color lights in the same direction; a lens into which the light beams emitted in the same direction by the light combining unit are incident, the first solid-state light source array is a blue solid-state light source array including a blue laser diode that emits blue light, which is a first color light; the second solid-state light source array is a green solid-state light source array including a green laser diode that emits green light, which is a second color light, and is made up of first and second green solid-state light source arrays; the third solid-state light source array is a red solid-state light source array including a red laser diode that emits red light, which is a third color light, and is composed of a first red solid-state light source array and a second red solid-state light source array; With the optical axis of the lens as the boundary, The third solid-state light source array is disposed on one side; the first solid-state light source array and the second solid-state light source array are disposed on the other side; The photosynthetic unit includes: a first mirror that reflects the blue light from the array of blue solid-state light sources; a second mirror that reflects the red light from the first array of red solid-state light sources; a first dichroic mirror that reflects the green light from the first green solid-state light source array and transmits the blue light reflected by the first mirror; a first polarizing beam splitter that transmits the green light from the second green solid-state light source array and reflects the blue light and the green light from the first dichroic mirror; a second polarizing beam splitter that reflects the red light from the second red solid-state light source array and transmits the red light reflected by the second mirror; a second dichroic mirror that reflects the blue light and the green light from the first polarizing beam splitter and transmits the red light from the second polarizing beam splitter.

14. A light source device according to any one of claims 1 to 13, an image light generating unit that modulates the light obtained from the light source device based on an image signal to generate image light; a projection optical system that enlarges and projects the image light generated by the image light generation unit; A projection type image display device comprising:

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