JP2019040177A - Light source device and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and wide color gamut light source device and a projection type display device while eliminating speckle noise from red, green and blue solid light sources. A light source device includes a red laser light source 33, a green laser light source 39, a blue laser light source 45, a red reflection dichroic mirror 48, a small blue reflection dichroic mirror 49, and a speckle of laser light of the laser light source. The projection type display device includes a rotation diffuser plate 57 that reduces noise and uneven brightness, and a plurality of diffuser plates 53 and 58 arranged in front of and behind the rotation diffuser plate, and the projection type display device includes such a light source device. [Selection diagram] Fig. 1

Description

  The present disclosure relates to a projection display apparatus that enlarges and projects an image formed by an image forming element irradiated with illumination light onto a screen using a projection lens.

  There are many light source devices that use solid-state light sources such as semiconductor lasers and light-emitting diodes that have a long life as light sources for projection display devices that use mirror-deflection type digital micromirror devices (DMDs) and liquid crystal panel light valves. It is disclosed. Among them, a light source device having a wide color gamut and using a blue, green, and red solid light source is disclosed.

  Speckle noise is generated when an image is formed on a screen using a highly coherent laser beam. Patent Document 1 discloses a technique for eliminating this speckle noise by a rotatable diffusion plate. Patent Document 2 discloses a configuration using a plurality of polymer dispersion panels that change a plurality of diffusion degrees as means for eliminating other speckle noise.

Japanese Patent Laid-Open No. 6-208089 International Publication No. 2007/116935

  The present disclosure provides a light source device and a projection display device that have a wide color gamut and are small and have high luminance while eliminating speckle noise and minute luminance unevenness.

  The light source device of the projection display device of the present disclosure is composed of a solid light source that emits blue, green, and red color light, a plurality of dichroic mirrors that combine color light from the solid light source, and a plurality of dichroic mirrors. A first diffusion plate on which the combined light is incident; and a dynamic diffusion plate disposed at a position where the combined light from the first diffusion plate is condensed and diverges.

  According to the present disclosure, a blue, green, and red solid light source, a small dichroic mirror that combines light collected from the solid light source, and the first diffusion disposed in front of the dynamic diffusion plate and the dynamic diffusion plate With the plate, it is possible to construct a light source device having a wide color gamut and a small size and high luminance while eliminating speckle noise and minute luminance unevenness. For this reason, it is possible to realize a projection display device having a wide color gamut, a small size, and high brightness.

Configuration diagram of light source device according to Embodiment 1 The figure which shows the spectral characteristic and light source spectral characteristic of the dichroic mirror in Embodiment 1 Configuration diagram of rotating diffusion plate in embodiment 1 Configuration diagram of a projection display apparatus according to Embodiment 2 Configuration diagram of a projection display apparatus according to Embodiment 3

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

(Embodiment 1)
FIG. 1 is a configuration diagram of a light source device 60 according to the first embodiment of the present disclosure.

  The red laser light source 33 includes a red semiconductor laser 30 that is a red solid light source, a collimating lens 31, and a heat radiating plate 32. The green laser light source 39 includes a green semiconductor laser 36 which is a green solid light source, a collimating lens 37 and a heat radiating plate 38. The blue laser light source 45 includes a blue semiconductor laser 42 which is a blue solid light source, a collimating lens 43 and a heat radiating plate 44.

  The light source device 60 includes a heat sink 34, 40, 46, a red reflecting dichroic mirror 48, a blue reflecting dichroic mirror 49, condenser lenses 50, 51, 52, 59, diffusion plates 53, 58, a circular diffusion plate 55, and a motor. Rotating diffusion plate 57 which is a dynamic diffusion plate composed of 56 and reflection mirror 54 are provided. FIG. 1 shows the appearance of each of the light beams 35, 41, and 47 emitted from the semiconductor laser light source, and the polarization direction of the light incident on and emitted from the red reflecting dichroic mirror 48 and the blue reflecting dichroic mirror 49. The diffusion plate 53 corresponds to a first diffusion plate, and the diffusion plate 58 corresponds to a second diffusion plate.

  The red laser light source 33 is configured such that 24 (6 × 4) red semiconductor lasers 30 and a collimating lens 31 are two-dimensionally arranged on a heat radiating plate 32 at regular intervals. The red semiconductor laser 30 emits red color light with a wavelength width of 632 nm to 648 nm, and emits linearly polarized light. The light emitted from the red semiconductor laser 30 is condensed by the corresponding collimator lens 31 and converted into a parallel light beam 35. The group of light beams 35 is incident on and reflected by a dichroic mirror 48 that reflects red. The heat sink 34 is for cooling the red laser light source 33.

  The green laser light source 39 is obtained by arranging 24 (6 × 4) green semiconductor lasers 36 and a collimating lens 37 two-dimensionally on a heat radiating plate 38 at regular intervals. The green semiconductor laser 36 emits green color light with a wavelength width of 517 nm to 533 nm, and emits linearly polarized light. The light emitted from the green semiconductor laser 36 is condensed by the corresponding collimator lens 37 and converted into a parallel light beam 41. The light beam 41 group is incident on and transmitted through a red reflecting dichroic mirror 48. The semiconductor lasers of the respective colors are arranged so that the polarized light emitted from the green and red semiconductor lasers 30 and 36 is S-polarized with respect to the incident surface of the red reflecting dichroic mirror 48. The heat sink 40 is for cooling the green laser light source 39.

  The blue laser light source 45 is a two-dimensional arrangement of blue semiconductor lasers 42 and collimating lenses 43 arranged in a square shape (2 × 4) on a heat radiating plate 44 at regular intervals. The blue semiconductor laser 42 has a higher light output and emission efficiency of a single semiconductor laser than a red and green semiconductor laser, and a blue light output required for a desired white light chromaticity is small. / 3 or less of the number of semiconductor lasers.

  The semiconductor laser is arranged so that the polarized light emitted from the blue semiconductor laser 42 is S-polarized with respect to the incident surface of the blue reflecting dichroic mirror 49. The heat sink 46 is for cooling the blue laser light source 45.

  The blue semiconductor laser 42 emits blue color light with a wavelength width of 447 nm to 462 nm and emits linearly polarized light. The light emitted from the blue semiconductor laser 42 is condensed by the corresponding collimator lens 43 and converted into a parallel light beam 47. The 47 light beams enter the condenser lens 51.

  The red laser light and the green laser light synthesized by the red reflecting dichroic mirror 48 enter the condenser lens 50. The condenser lens 50 converts incident parallel light into light that is condensed at about ± 12 degrees. The light transmitted through the condenser lens 50 is incident on and transmitted through a blue reflecting dichroic mirror 49. On the other hand, after the blue laser light is converted into light condensed by the condenser lens 51, it is incident on the blue reflecting dichroic mirror 49 and reflected.

  FIG. 2 shows spectral transmittance characteristics of a red reflecting dichroic mirror and a blue reflecting dichroic mirror. FIG. 2 also shows the relative intensity spectra of blue, green, and red laser beams.

  The red reflecting dichroic mirror 48 has a characteristic of transmitting green laser light at 96% or more and reflecting red laser light at 98% or more in an arrangement with an incident angle of 45 degrees. The half-value wavelength at which the transmittance is 50% is 583 nm, which is an intermediate wavelength between the main wavelength of 525 nm of green laser light and the main wavelength of 640 nm of red laser light.

  The blue reflecting dichroic mirror 49 has an incident angle of 45 degrees, and transmits red laser light and green laser light at 96% or more and reflects blue laser light at 98% or more. The half-value wavelength at which the transmittance is 50% is 495 nm, which is an intermediate wavelength between the main wavelength of 465 nm of blue laser light and the main wavelength of 525 nm of green laser light.

  The incident angle of the red laser beam and the green laser beam on the dichroic mirror reflecting red is 45 degrees. On the other hand, the blue laser light becomes condensed light and enters the blue reflecting dichroic mirror, and the incident angle is 45 ° ± 12 °.

  For this reason, the spectral transmittance characteristic of the blue reflecting dichroic mirror 49 is shifted in wavelength by about −20 to +20 nm in accordance with the incident angle. However, since the difference between the main wavelengths of the blue laser light and the green laser light is 60 nm, there is no decrease in the transmittance and reflectance characteristics for each laser light.

  If the change in the incident angle to the blue-reflecting dichroic mirror is even larger, leading to a decrease in the transmittance and reflectance of the laser beam, the half-value wavelength is constant even if the incident angle changes. A dichroic mirror is used.

  Each laser beam transmitted and reflected by the blue reflecting dichroic mirror 49 enters the condenser lens 52. The condenser lens 52 is combined with the condenser lenses 50 and 51 to determine the lens shape so that each laser beam is condensed in the vicinity of the rotary diffusion plate 57. The laser light that has passed through the condenser lens 52 is diffused by the diffusion plate 53, then reflected by the reflection mirror 54, and enters the rotating diffusion plate 57. The diffusing plate 53 is formed by forming minute microlenses formed on a glass substrate in an array to form a diffusing surface, and diffuses incident light. By adopting a microlens shape, the diffusion loss can be reduced by reducing the maximum divergence angle as compared with a chemically treated diffusion plate that uses a solution such as hydrofluoric acid to process the glass surface into a fine uneven shape. The diffusion angle, which is the half-value angle width that is 50% of the maximum intensity of the diffused light, is as small as about 6 degrees, and maintains the polarization characteristics. If the diameter at which the light intensity is 13.5% with respect to the peak intensity is defined as the spot diameter, the spot diameter is superimposed on the spot light having a diameter of 3 mm to 5 mm and is incident on the rotating diffusion plate 57. The diffusion plate 53 diffuses the light so that the spot light has a desired spot diameter.

  FIG. 3 shows the configuration of the rotating diffusion plate, FIG. 3 (a) is a plan view, and FIG. 3 (b) is a side view. The circular diffusion plate 55 is provided with a smooth surface region 62 in order to provide a bonding surface with high adhesion to the motor 56.

  The rotation diffusion plate 57 includes a circular diffusion plate 55 provided with a diffusion region 61 in which fine irregularities are formed on the surface of a glass substrate and a motor 56 at the center, and the rotation control is performed. Is possible. The rotating diffusion plate 57 is a diffusion plate that can rotate at a high speed up to about 10,800 rpm.

  A diffusion plate of chemical treatment is used for the diffusion region, the diffusion angle is about 12 degrees, and the polarization characteristics are maintained. The chemically treated diffusion plate can be formed on both sides of a glass substrate, and the diffusion angle can be made larger than that of the diffusion plate of the microlens array, and a large-sized diffusion plate can be constructed at a relatively low cost. Although the maximum divergence angle of the chemically treated diffusion plate is increased, the condenser lens 59 can efficiently collect light. By rotating the diffusion surface, the random interference pattern on the screen caused by the laser light fluctuates at high speed in time and space, and speckle noise can be eliminated. In addition, the diffuser plate 53 and the rotating diffuser plate 57 can also reduce the minute luminance unevenness caused by the minute light emission size and the number of light emission of the laser light source.

  The light diffused by the rotating diffusion plate 57 becomes light in which speckle noise due to the properties of the laser light is substantially eliminated, and enters the diffusion plate 58. The diffusing plate 58 is a diffusing plate in which a microlens array is formed on a glass substrate. The diffusing angle is approximately 6 degrees and maintains the polarization characteristics. Since the light is further diffused by the diffusing plate 58, luminance unevenness caused by the minute light emission size and the number of light emission points of the laser light source can be eliminated. The diffusing plate 53, the rotating diffusing plate 57, and the diffusing plate 58 are all arranged at positions where the light becomes condensed light or divergent light. By disposing at the position of the condensed light or diverging light, even the spread light can be efficiently condensed by the condenser lens 59, and the diffusion plate 53, the rotation diffusion plate 57, and the diffusion plate 58 can be arranged in a small size. Therefore, an inexpensive and small light source device can be configured. The light transmitted through the diffusion plate 58 is collected by the condenser lens 59 and converted into substantially parallel light.

  The shape of the condenser lens 59 is determined so that the spot light in the vicinity of the rotating diffusion plate 57 becomes parallel light. Since the optical elements from the red, green, and blue laser light sources to the condenser lens 59 maintain the polarization characteristics, the light emitted from the condenser lens 59 emits S-polarized light.

  The arrangement of the green laser light source and the red laser light source may be changed by using the red reflecting dichroic mirror 48 as a green reflecting dichroic mirror.

  Although the configuration in which parallel light is incident on the red reflecting dichroic mirror 48 is shown, the light emitted from the red laser light source and the green laser light source is condensed by the condenser lens, and the condensed light is applied to the red reflecting dichroic mirror. The dichroic mirror may be downsized by being arranged so as to be incident.

  Although the diffusion plates 53 and 58 have been described using the diffusion plate of the microlens array, the light collection efficiency is slightly lowered, but an inexpensive chemical treatment diffusion plate may be used.

  The circular diffusion plate 55 of the rotary diffusion plate 57 has been described using a chemically processed diffusion plate. However, although it is expensive, diffusion of a microlens array may be used. The rotating diffuser plate 57 may be a dynamic diffuser plate that swings and vibrates instead of rotating.

  The rotating diffuser plate 57 may be rotated at a low speed, and the diffuser plate and the reflection mirror may be provided with a mechanism that swings or vibrates to reduce speckle noise. In order to increase the number of light beams of the laser light, the reflection mirror 54 may use a multiple reflection mirror having a surface reflectance of 30% and a back surface reflectance of 100% to reduce luminance unevenness caused by the laser light.

  The red laser light source, the green laser light source, and the blue laser light source have a configuration in which 24, 24, and 8 semiconductor laser elements are arranged, respectively, but in order to increase the brightness, a larger number of semiconductor laser elements are used. It may be configured.

  As described above, the light source device of the present disclosure is a compact light source including a dichroic mirror on which condensed light from red, green, and blue laser light sources is incident and a plurality of diffusion plates on which condensed light or divergent light is incident. The device can be configured. Further, the speckle noise and luminance unevenness inherent to the laser light can be eliminated by the rotation diffusion plate and the first diffusion plate arranged in front of the rotation diffusion plate. For this reason, the light source device of the present disclosure can obtain white light having a small size and a wide color gamut.

(Embodiment 2)
FIG. 4 is a diagram illustrating a first projection display apparatus according to the second embodiment of the present disclosure.

  The first projection display apparatus 200 uses an active matrix transmissive liquid crystal panel in which a thin film transistor is formed in a pixel region, which is a TN mode or a VA mode, as an image forming element.

  The light source device 60 of the first projection display device 200 includes a red laser light source 33, a green laser light source 39, a blue laser light source 45, heat sinks 34, 40, 46, a red reflecting dichroic mirror 48, a blue reflecting dichroic mirror 49, Condenser lenses 50, 51, 52, a diffuser plate 53, a reflection mirror 54, a circular diffuser plate 55 and a rotary diffuser plate 57 composed of a motor 56, a diffuser plate 58, and a condenser lens 59. The above is the light source device described in the first embodiment of the present disclosure.

  The first projection display device 200 also includes a first lens array plate 201, a second lens array plate 202, a superimposing lens 203, a blue reflecting dichroic mirror 204, a green reflecting dichroic mirror 205, and a reflecting mirror 206. , 207, 208, relay lenses 209, 210, field lenses 211, 212, 213, incident side polarizing plates 214, 215, 216, liquid crystal panels 217, 218, 219, outgoing side polarizing plates 220, 221, 222, red reflection A color combining prism 223 including a dichroic mirror and a blue reflecting dichroic mirror, and a projection lens 224 are provided.

  White light from the light source device 60 is incident on the first lens array plate 201 composed of a plurality of lens elements. The light beam incident on the first lens array plate 201 is divided into a number of light beams. The many divided light beams converge on the second lens array plate 202 composed of a plurality of lenses. The lens elements of the first lens array plate 201 have an opening shape similar to the liquid crystal panels 217, 218, and 219. The focal lengths of the lens elements of the second lens array plate 202 are determined so that the first lens array plate 201 and the liquid crystal panels 217, 218, and 219 have a substantially conjugate relationship. The light emitted from the second lens array plate 202 enters the superimposing lens 203. The superimposing lens 203 is a lens for superimposing and illuminating the light emitted from each lens element of the second lens array plate 202 on the liquid crystal panels 217, 218, and 219. The first and second lens array plates 201 and 202 and the superimposing lens 203 constitute an illumination optical system.

  The light from the superimposing lens 203 is separated into blue, green and red color light by a blue reflecting dichroic mirror 204 and a green reflecting dichroic mirror 205 which are color separation means. The green color light passes through the field lens 211 and the incident side polarizing plate 214 and enters the liquid crystal panel 217. The blue color light is reflected by the reflection mirror 206, then passes through the field lens 212 and the incident side polarizing plate 215 and enters the liquid crystal panel 218. The red color light is transmitted and refracted and reflected by the relay lenses 209 and 210 and the reflection mirrors 207 and 208, passes through the field lens 213 and the incident side polarizing plate 216, and enters the liquid crystal panel 219. Thus, the light from the light source device 60 is condensed by the illumination optical system and illuminates the liquid crystal panel which is the illuminated area.

  The three liquid crystal panels 217, 218, and 219 change the polarization state of incident light by controlling the voltage applied to the pixels according to the video signal, and the transmission axes are orthogonal to both sides of each liquid crystal panel 217, 218, and 219. The light is modulated by combining the incident-side polarizing plates 214, 215, and 216 and the outgoing-side polarizing plates 220, 221, and 222 arranged so as to form green, blue, and red images.

  Each color light transmitted through the output side polarizing plates 220, 221, and 222 is reflected by the color combining prism 223, and each red and blue color light is reflected by a red reflecting dichroic mirror and a blue reflecting dichroic mirror to be combined with green color light. , Enters the projection lens 224. The light incident on the projection lens 224 is enlarged and projected on a screen (not shown).

  Conventionally, when light from a light source device using a solid light source is non-polarized light, a projection display device has been configured using a polarization conversion element. In the present disclosure, since the light emitted from the light source device is S-polarized light, a polarization conversion element is not necessary. For this reason, the light collection efficiency of the projection display device can be improved and the cost can be reduced.

  The light source device is configured in a small size by using red, green, and blue laser light sources, and emits white light having high color purity of the three primary colors. Therefore, a projection display device having a small size and a wide color gamut can be realized. In addition, since the image forming means uses three liquid crystal panels that use polarized light instead of the time-division method, there is no color breaking, color reproduction is good, and a bright and high-definition projected image can be obtained. In addition, the total reflection prism is not required and the color combining prism is a small 45-degree incident prism compared to the case where three DMD elements are used, and thus the projection display apparatus can be made compact.

  As described above, the first projection display device of the present disclosure includes a red, blue, and green laser light source, a small dichroic mirror that combines color light from each laser light source, a rotating diffusion plate, and a rotating diffusion plate. A light source device including a first diffusion plate disposed in front is used. For this reason, it is possible to construct a projection display device that is small and has a wide color gamut while eliminating speckle noise and luminance unevenness.

  Although a transmissive liquid crystal panel is used as the image forming element, a reflective liquid crystal panel may be used. By using a reflective liquid crystal panel, a more compact and high-definition projection display device can be configured.

(Embodiment 3)
FIG. 5 is a diagram illustrating a second projection display apparatus according to the third embodiment of the present disclosure. Three mirror deflection type DMDs are used as image forming elements.

  The light source device 63 of the second projection display device 300 includes a red laser light source 33, a green laser light source 39, a blue laser light source 45, heat sinks 34, 40 and 46, a red reflecting dichroic mirror 48, a blue reflecting dichroic mirror 49, The condenser lens 50, 51, 52, the diffusion plate 53, the reflection mirror 54, the circular diffusion plate 55, and the rotation diffusion plate 57 including the motor 56 and the diffusion plate 58 are included. The difference from the light source device according to the first embodiment of the present disclosure is that the condenser lens 59 is not disposed.

  White light emitted from the light source device 63 is condensed on the rod 301. Light incident on the rod 301 is reflected a plurality of times inside the rod, and the light intensity distribution is made uniform and emitted. Light emitted from the rod 301 is collected by the relay lens 302, reflected by the reflection mirror 303, then transmitted through the field lens 304, and enters the total reflection prism 305.

  The total reflection prism 305 includes two prisms, and a thin air layer 306 is formed on the adjacent surfaces of the prisms. The air layer 306 totally reflects light incident at an angle greater than the critical angle. Light from the field lens 304 is reflected by the total reflection surface of the total reflection prism 305 and enters the color prism 307.

  The color prism 307 includes three prisms, and a blue reflecting dichroic mirror 308 and a red reflecting dichroic mirror 309 are formed on the adjacent surfaces of the prisms. The light is separated into blue, red, and green color lights by the blue reflecting dichroic mirror 308 and the red reflecting dichroic mirror 309 of the color prism 307 and is incident on the DMDs 310, 311, and 312, respectively. Thus, the light from the light source device 63 illuminates the illuminated area, which is the area where the DMD micromirror is provided, by the illumination optical system including the rod 301.

  DMDs 310, 311, and 312 deflect the micromirror according to the video signal to form light that becomes an image, and reflect the light that is incident on the projection lens 313 and the light that travels outside the effective range of the projection lens 313. The light reflected by the DMDs 310, 311, and 312 passes through the color prism 307 again. In the process of passing through the color prism 307, the separated blue, red, and green color lights are combined and enter the total reflection prism 305. Since the light incident on the total reflection prism 305 enters the air layer 306 at a critical angle or less, it passes through and enters the projection lens 313. In this manner, the image light formed by the DMDs 310, 311, and 312 is enlarged and projected on a screen (not shown).

  The diffusing plate 58 is disposed between the rotating diffusing plate 57 and the rod 301. However, the diffusing plate 58 may be disposed between the rod 301 and the relay lens 302 on which diverging light enters the diffusing plate.

  Since DMD is used, the light emitted from the light source device may not be linearly polarized light. In this case, the light from the red laser light source, the green laser light source, and the blue laser light source may be either S-polarized light or P-polarized light. Further, the optical elements from the laser light source to the diffusion plate 58 do not have to maintain the polarization characteristics.

  The light source device is configured in a small size by using red, green, and blue laser light sources, and emits white light having high color purity of the three primary colors. Therefore, a projection display device having a small size and a wide color gamut can be realized. Since DMD is used as the image forming element, a projection display device having higher light resistance and heat resistance than an image forming element using liquid crystal can be configured. Furthermore, since three DMDs are used, color reproduction is good and a bright and high-definition projected image can be obtained.

  As described above, the second projection display device of the present disclosure includes a red, blue, and green laser light source, a small dichroic mirror that synthesizes color light from each laser light source, a rotating diffusion plate, and a rotating diffusion plate. A light source device including a first diffusion plate disposed in front is used. For this reason, it is possible to construct a projection display device that is small and has a wide color gamut while eliminating speckle noise and luminance unevenness.

  Although three DMDs are used as image forming elements, a single DMD may be used. By using one DMD, a smaller and cheaper projection display device can be configured.

  The present disclosure relates to a projection display apparatus using an image forming element.

30 Red semiconductor laser 31, 37, 43 Collimator lens 32, 38, 44 Heat sink 33 Red laser light source 34, 40, 46 Heat sink 35, 41, 47 Light flux 36 Green semiconductor laser 39 Green laser light source 42 Blue semiconductor laser 45 Blue laser light source 48, 309 Red reflecting dichroic mirror 49, 204, 308 Blue reflecting dichroic mirror 50, 51, 52, 59 Condenser lens 53, 58 Diffuser plate 54 Reflecting mirror 55 Circular diffuser plate 56 Motor 57 Rotating diffuser plate 60, 63 Light source device 61 Diffusion area 62 Smooth surface area 200, 300 Projection display device 201, 202 Lens array plate 203 Superimposing lens 205 Green reflecting dichroic mirror 206, 207, 208, 303 Reflecting mirror 209, 210, 302 Relay Lens 211, 212, 213, 304 Field lens 214, 215, 216 Incident side polarizing plate 217, 218, 219 Liquid crystal panel 220, 221, 222 Outgoing side polarizing plate 223 Color synthesis prism 224, 313 Projection lens 301 Rod 305 Total reflection prism 306 Air layer 307 Color prism 310, 311, 312 DMD

Claims (14)

A solid-state light source that emits blue, green, and red light,
A plurality of dichroic mirrors for combining colored light from the solid-state light source;
A first diffuser plate on which the combined light combined by the plurality of dichroic mirrors is incident;
A dynamic diffusion plate disposed at a position where the combined light from the first diffusion plate is condensed and diverged;
A light source device.   The light source device according to claim 1, further comprising a second diffusion plate on which diverging light from the dynamic diffusion plate is incident.   2. The light source device according to claim 1, wherein the plurality of dichroic mirrors include a red-reflection or green-reflection dichroic mirror that receives parallel light and a blue-reflection dichroic mirror that receives condensed light.   4. The light source device according to claim 3, wherein the blue reflecting dichroic mirror is a film thickness distribution type dichroic mirror.   The said dynamic diffusion plate is a rotation diffusion plate provided with the circular diffusion plate which formed the fine uneven | corrugated shape in the shape of the circumference on the surface of the glass substrate, and the motor which rotates the said circular diffusion plate. Light source device.   The light source device according to claim 1, wherein the first diffusion plate is a diffusion plate in which a microlens array is formed on a glass substrate.   The light source device according to claim 1, wherein the solid-state light source that emits the blue color light is a blue semiconductor laser.   The light source device according to claim 1, wherein the solid-state light source that emits the green color light is a green semiconductor laser.   The light source device according to claim 1, wherein the solid-state light source that emits the red color light is a red semiconductor laser.   The light source device according to claim 1, wherein the color light emitted from the solid-state light source is linearly polarized light.   The light source device according to claim 1, wherein the light emitted from the dynamic diffusion plate is linearly polarized light. A light source device according to claim 1;
An illumination optical system for condensing light from the light source device;
An image forming element that is illuminated with light from the illumination optical system and forms an image according to a video signal;
A projection lens for enlarging and projecting an image formed by the image forming element;
A projection display device comprising:   The projection display device according to claim 12, wherein the image forming element is a liquid crystal panel.   The projection display device according to claim 12, wherein the image forming element is a mirror deflection type digital micromirror device (DMD).

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