JP2018013764A - Light-source device and projection type display device - Google Patents

Light-source device and projection type display device Download PDF

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Publication number
JP2018013764A
JP2018013764A JP2017073479A JP2017073479A JP2018013764A JP 2018013764 A JP2018013764 A JP 2018013764A JP 2017073479 A JP2017073479 A JP 2017073479A JP 2017073479 A JP2017073479 A JP 2017073479A JP 2018013764 A JP2018013764 A JP 2018013764A
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Japan
Prior art keywords
light
plate
light source
retardation plate
dichroic mirror
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JP2017073479A
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Japanese (ja)
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田中 孝明
Takaaki Tanaka
孝明 田中
学 奥野
Manabu Okuno
学 奥野
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パナソニックIpマネジメント株式会社
Panasonic Ip Management Corp
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Priority to JP2016137293 priority
Application filed by パナソニックIpマネジメント株式会社, Panasonic Ip Management Corp filed Critical パナソニックIpマネジメント株式会社
Priority claimed from US15/615,444 external-priority patent/US10838289B2/en
Publication of JP2018013764A publication Critical patent/JP2018013764A/en
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Abstract

A light source device using a polarization plate of light emitted from a solid-state light source and using a phase plate having excellent durability and low cost, and a projection display device using the light source device are provided.
In a light source device, P-polarized blue light emitted from a semiconductor laser is transmitted through a condenser lens, a lens, a lens, and a first diffusion plate, and is incident on a dichroic mirror. The dichroic mirror 29 transmits a part of the P-polarized blue light and reflects the remaining light. The blue light that has passed through the dichroic mirror 29 is condensed by the condenser lens 36 to become condensed light, passes through the quarter-wave plate 38 and enters the reflecting plate 39. The blue light that becomes divergent light when reflected by the reflecting plate passes through the quarter-wave plate 38 and enters the condenser lens 36 to be converted into parallel light.
[Selection] Figure 1

Description

  The present disclosure relates to a projection display apparatus that irradiates an image formed on a small light valve with illumination light and enlarges and projects the image on a screen by a projection lens.

  Many light source devices using a solid-state light source of a semiconductor laser or a light emitting diode having a long life are disclosed as light sources of a projection display device using a mirror deflection type digital micromirror device (DMD) or a light valve of a liquid crystal panel. Yes. Among them, Patent Document 1 discloses a light source device that efficiently collects light from a solid light source in a small size by using polarization characteristics of light emitted from the solid light source.

  Further, Patent Document 2 discloses a small and high-frequency plate that uses a half-wave plate that converts the polarization direction of light from a fixed light source and controls the P-polarized component and the S-polarized component incident on the dichroic mirror at a constant ratio. An efficient light source device is disclosed.

JP 2012-137744 A JP 2014-209184 A

  The present disclosure provides a light source device that uses a polarization characteristic of light emitted from a solid-state light source and uses a low-cost retardation plate that is excellent in durability, and a projection display device that uses the light source device.

  A first light source device of the present disclosure includes a solid-state light source, a condensing element that collects light from the solid-state light source, a retardation plate that converts linearly polarized light into circularly-polarized light, and a reflective plate, The plate is disposed between the light collecting element and the reflecting plate at a position where the condensed light or the divergent light is incident.

  In addition, a second light source device of the present disclosure includes a solid-state light source, a retardation plate that converts the polarization direction of light from the solid-state light source, and controls light of P-polarized light and S-polarized light component at a certain ratio, A dichroic mirror that polarizes and separates light from the phase difference plate is provided, and the phase difference plate is disposed between the solid-state light source and the dichroic mirror at a position where condensed light or divergent light is incident.

  According to the present disclosure, a small and inexpensive light source device can be configured by arranging and configuring the phase difference plate at a position where light is collected, and thus a long-life, bright and low-cost projection display device can be realized.

Configuration diagram of light source device according to Embodiment 1 of the present disclosure The figure which shows the spectral characteristics of the dichroic mirror in Embodiment 1. The figure which shows the angle dependence characteristic of the polarization transmittance of a phase difference plate Configuration diagram of light source device according to Embodiment 2 of the present disclosure The figure which shows the spectral characteristics of the dichroic mirror in Embodiment 2. Configuration diagram of a projection display device according to Embodiment 3 of the present disclosure Configuration diagram of a projection display apparatus according to Embodiment 4 of the present disclosure

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

  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.

(Embodiment 1)
FIG. 1 is a configuration diagram of a light source device according to a first embodiment of the present disclosure. The light source device 40 of the first embodiment includes a semiconductor laser 21 that is a solid light source, a radiator plate 22, a condenser lens 23, a heat sink 24, a lens 26, a lens 27, a first diffuser plate 28, a dichroic mirror 29, and a first condenser. Capacitor lenses 30 and 31, which are elements, a fluorescent plate 35 composed of an aluminum substrate 33 on which a reflecting film and a phosphor layer 32 are formed, and a motor 34, a condenser lens 36 which is a second condensing element, a second diffusion plate 37, It comprises a quarter wave plate 38 that is a phase difference plate and a reflection plate 39. FIG. 1 shows the appearance of each light beam 25 emitted from the solid-state light source and the polarization direction of the light incident on and emitted from the dichroic mirror 29.

  The semiconductor laser 21 and the condenser lens 23 in which 24 (6 × 4) are squarely arranged are two-dimensionally arranged on the heat sink at a constant interval. The heat sink 24 is for cooling the semiconductor laser 21. The semiconductor laser 21 emits blue color light with a wavelength width of 447 nm to 462 nm, and emits linearly polarized light. Each semiconductor laser is arranged so that the polarized light emitted from the semiconductor laser 21 is P-polarized with respect to the incident surface of the dichroic mirror 29.

  The light emitted from the plurality of semiconductor lasers 21 is collected by the corresponding condenser lens 23 and converted into a parallel light beam 25. The luminous flux 25 group is further reduced in diameter by a convex lens 26 and a concave lens 27 and is incident on the first diffusion plate 28. The first diffusion plate 28 is made of glass and diffuses light with a fine uneven shape on the surface. 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 3 degrees, and maintains the polarization characteristics. The light emitted from the first diffusion plate 28 enters the dichroic mirror 29.

  FIG. 2 shows the spectral characteristics of the dichroic mirror. The spectral characteristics indicate the transmittance with respect to the wavelength. The spectral characteristics of the dichroic mirror are that the P-polarized light of the semiconductor laser light having a wavelength of 447 to 462 nm is transmitted at a certain ratio (average 18%) and reflected (average 82%), and the S-polarized light is reflected with a high reflectance of 95% or more. It is a characteristic to be made. Further, the P-polarized light and the S-polarized light of green and red color light each have a characteristic of transmitting with a high transmittance of 96% or more.

  When 82% of P-polarized blue light reflected by the dichroic mirror 29 is collected by the condenser lenses 30 and 31, and the diameter at which the light intensity is 13.5% of the peak intensity is defined as the spot diameter, the spot diameter is The light is superimposed on the spot light of 1.5 mm to 2.5 mm and enters the fluorescent screen 35. The first diffusion plate 28 diffuses the light so that the spot light has a desired diameter.

The fluorescent plate 35 is an aluminum substrate 33 on which a reflecting film and a phosphor layer 32 are formed, and a circular substrate that can be rotationally controlled and has a motor 34 at the center. The reflection film of the fluorescent plate 35 is a metal film or a dielectric film that reflects visible light, and is formed on an aluminum substrate. Further, a phosphor layer 32 is formed on the reflective film. In the phosphor layer 32, a Ce-activated YAG yellow phosphor that is excited by blue light and emits yellow light containing green and red components is formed. A typical chemical structure of the crystal matrix of this phosphor is Y 3 Al 5 O 12 . The phosphor layer 32 is formed in an annular shape. The phosphor layer 32 excited by the spot light emits yellow light including green and red component lights. The fluorescent plate 35 is an aluminum substrate, and by rotating, the temperature rise of the phosphor layer 32 due to excitation light can be suppressed and the fluorescence conversion efficiency can be stably maintained.

  The light incident on the phosphor layer 32 fluoresces the green and red component color lights and exits the fluorescent plate 35. Further, the light emitted to the reflection film side is reflected by the reflection film and emitted from the fluorescent plate 35. The green and red color lights emitted from the fluorescent plate 35 become natural light (non-polarized light), are again collected by the condenser lenses 30 and 31, converted into substantially parallel light, and then transmitted through the dichroic mirror 29.

  On the other hand, 18% of the P-polarized blue light transmitted through the dichroic mirror 29 is incident on the condenser lens 36, which is the second light condensing element, and is condensed to become condensed light. The focal length of the condenser lens 36 is set so that the condensing angle is 40 degrees or less, and a condensing spot is formed in the vicinity of the reflecting plate 39. The condensed light collected by the condenser lens 36 enters the second diffusion plate 37. The second diffusion plate 37 diffuses incident light to make the light intensity distribution uniform, and eliminates speckles in the laser light. The second diffusion plate 37 is formed by forming a diffusion surface in a fine uneven shape on a thin glass surface. The second diffusing plate 37 has a diffusion angle of about 4 degrees with a single transmitted light to the diffusing surface, and maintains the polarization characteristics. The light transmitted through the second diffusion plate 37 is incident on a quarter wave plate 38 that is a phase difference plate. The quarter wavelength plate 38 is a retardation plate whose phase difference becomes a quarter wavelength near the emission center wavelength of the semiconductor laser 21.

  The quarter-wave plate 38 is arranged with an optical axis of 45 degrees when the P polarization direction in FIG. The quarter-wave plate 38 is a thin film retardation plate (see Japanese Patent Application Laid-Open No. 2012-242449) using birefringence by oblique deposition of a dielectric material. The thin film retardation plate is made of an inorganic material, and is excellent in durability and reliability as in the case of an inorganic optical crystal such as quartz. Further, since the thin film wave plate is laminated and formed with a film thickness sufficiently thinner than the wavelength of light, the entire oblique vapor deposition layer becomes a phase difference plate having one optical axis. For this reason, the change of the phase difference with respect to the incident angle is much smaller than that of a retardation plate of an inorganic optical crystal such as quartz.

  FIG. 3 shows an example of the angle dependency of the polarization transmittance in the thin film phase difference plate (solid line) and the crystal phase difference plate (broken line). The linearly polarized light is incident on the retardation plate and the transmittance of one linearly polarized light component after being converted to circularly polarized light is defined as the polarized light transmittance, and the polarized light transmittance with respect to the incident angle is shown. The polarization transmittance when the incident angle is 0 degree is normalized as 1.0. The thin film retardation plate has a 6% decrease in polarization transmittance at an incident angle of ± 30 degrees, whereas the quartz retardation plate has a 12% decrease in polarization transmittance at an incident angle of ± 5 degrees. Since the thin film phase difference plate is a phase difference plate having a very small incident angle dependency, it is possible to convert the incident linearly polarized light into circularly polarized light with high efficiency even if the thin film phase difference plate is disposed at a position where the condensed light or the divergent light is incident. Further, since the quarter wavelength plate 38 is disposed at a position where the condensed light or the divergent light is incident, the size of the quarter wavelength plate 38 is ½ or less compared to the case where it is disposed at the position where the conventional parallel light is incident. The size can be reduced, and the quarter-wave plate can be greatly reduced in cost.

  The light that has been transmitted through the quarter-wave plate 38 and converted into circularly polarized light is inverted in phase by the reflective plate 39 on which a reflective film such as aluminum or a dielectric multilayer film is formed, and becomes divergent light by reversely circularly polarized light. , Transmitted through the quarter-wave plate 38 and converted to S-polarized light. Further, since a member that disturbs polarization is not disposed between the quarter-wave plate 38 and the reflection plate 39, P-polarized light can be converted to S-polarized light with high efficiency.

  The S-polarized light converted by the quarter-wave plate 38 is again diffused by the second diffusion plate 37, converted to parallel light by the condenser lens 36, and reflected by the dichroic mirror 29.

  In this way, the fluorescent light from the fluorescent plate 35 and the blue light that has been efficiently polarized and converted are combined by the dichroic mirror 29 and emitted as white light. Good white balance emission characteristics can be obtained by yellow light containing green and red components of fluorescent light emission and blue light of the semiconductor laser 21. Even if this emission spectrum characteristic is separated into three primary color lights of blue, green and red by the optical system of the projection display device, monochromatic light having a desired chromaticity coordinate can be obtained.

  Although the thin film phase difference plate has been described as the quarter wavelength plate, a fine structure phase difference plate using birefringence generated in a fine periodic structure equal to or less than the wavelength of light may be used. Since the microstructural retardation plate has a microstructure equal to or less than the wavelength of light, the incident angle dependence characteristic of the polarization transmittance is small and the position where the condensed light is incident is the same as the thin film retardation plate shown in FIG. Can be placed.

  As described above, the light source device according to the present disclosure separates light from a plurality of semiconductor lasers with a dichroic mirror, and the green and red color lights that are excited and emitted by the separated light and the position where the condensed light is incident. The white light, which is the other light that has been polarized and converted by the small phase plate, is efficiently condensed and synthesized to obtain white light, so that a compact, highly efficient and inexpensive light source device can be configured. .

(Embodiment 2)
FIG. 4 is a configuration diagram of the light source device according to the second embodiment of the present disclosure.

  The light source device 72 according to the second embodiment includes a semiconductor laser 51, a heat radiating plate 52, a condenser lens 53, a heat sink 54, condenser lenses 56 and 59, a mirror 57, a half-wave plate 58 serving as a first phase plate, 1 diffuser plate 60, dichroic mirror 61, condenser lenses 62 and 63 as first condenser elements, fluorescent plate 67, condenser lens 68 as second condenser element, second diffuser plate 69, and first retardation plate 1 / 4 wavelength plate 70 and reflector 71. In the figure, the appearance of each light beam 55 emitted from the solid-state light source and the polarization direction of the light incident on and emitted from the dichroic mirror 61 are shown. The fluorescent plate 67 includes an aluminum substrate 65 on which a reflective film and a phosphor layer 64 are formed, and a motor 66.

  A configuration similar to that of the light source device 40 according to the first embodiment of the present disclosure includes a semiconductor laser 51, a heat radiating plate 52, a condenser lens 53, a heat sink 54, a first diffusing plate 60, condenser lenses 62 and 63, a fluorescent plate 67, and a condenser lens. 68, a second diffusion plate 69, a quarter-wave plate 70, which is a second retardation plate, and a reflection plate 71.

  24 (6 × 4) squarely arranged semiconductor lasers 51 and condenser lenses 53 are two-dimensionally arranged on the radiator plate 52 at regular intervals. The heat sink 54 is for cooling the semiconductor laser 51. The semiconductor laser 51 emits blue color light with a wavelength width of 447 nm to 462 nm and emits linearly polarized light. In FIG. 4, the semiconductor lasers are arranged so that the polarized light emitted from the semiconductor laser 51 is P-polarized with respect to the incident surface of the dichroic mirror 61 without passing through the phase difference plate. Light emitted from the plurality of semiconductor lasers 51 is condensed by the corresponding condenser lens 53 and converted into a parallel light beam 55. The luminous flux 55 group is collected by a convex condenser lens 56 and reflected by a mirror 57. The condensed light that has been reflected becomes divergent light after being condensed, and enters the half-wave plate 58 that is the first retardation plate. The incident angle of light on the half-wave plate 58 is 40 degrees or less. The half-wave plate 58 is a retardation plate whose phase difference becomes a half wavelength near the emission center wavelength of the semiconductor laser 51. The half-wave plate 58 has an optical axis arranged at 32.5 degrees when the P polarization direction in FIG. 4 is 0 degree. The half-wave plate 58 is provided with an adjustment mechanism in the rotation direction so that the arrangement angle of the optical axis can be adjusted.

  The polarization of the P-polarized light from the semiconductor laser 51 is converted to 65 degrees by the half-wave plate 58 so that the light intensity of the P-polarized component is 18% and the light intensity of the S-polarized component is 82%.

  The half-wave plate 58 is a thin film retardation plate that utilizes birefringence by oblique deposition of a dielectric material. The thin film retardation plate is made of an inorganic material, and is excellent in durability and reliability as in the case of an inorganic optical crystal such as quartz. In addition, since the thin film wave plate is laminated and formed with a film thickness sufficiently thinner than the wavelength of light, the change of the phase difference with respect to the incident angle of light is much smaller than the phase difference plate of inorganic optical crystals such as quartz. . For this reason, even if it is a case where it arrange | positions in the position which the light which condenses or diverges injects, the azimuth | direction of P polarization from the semiconductor laser 51 can be rotationally converted with high efficiency. Further, since the half-wave plate 58 is disposed at a position where the condensed light is incident, the size of the half-wave plate 58 is 1/2 that of the case where the half-wave plate 58 is disposed at a position where the conventional parallel light is incident. The size can be reduced to the following, and the half-wave plate can be greatly reduced in cost.

  The light transmitted through the half-wave plate 58 is converted into substantially parallel light by the condenser lens 59, enters the first diffusion plate 60, is diffused, and enters the dichroic mirror 61.

  FIG. 5 shows the spectral transmittance characteristics of the dichroic mirror 61. The dichroic mirror 61 has the characteristics that the transmittance is 50% for S-polarized light and 442 nm for P-polarized light, and 442 nm for P-polarized light. The dichroic mirror 61 transmits and reflects blue light, and transmits color light including green and red components at 96% or more. It is a characteristic. The S-polarized component of the light incident on the dichroic mirror 61 is reflected and the P-polarized component is transmitted. Since the optical axis of the half-wave plate 58 is arranged at 32.5 degrees, the direction of polarization of incident light is 65 degrees, and the light intensities of the S-polarized component and the P-polarized component are 82% and 18%, respectively. .

The S-polarized light reflected by the dichroic mirror 61 is collected by the condenser lenses 62 and 63 and is superimposed on the spot light having a diameter of 1.5 mm to 2.5 mm where the light intensity is 13.5% of the peak intensity. , Enters the fluorescent screen 67. The first diffusion plate 60 diffuses the light so that the spot light has a desired diameter. The fluorescent plate 67 is an aluminum substrate 65 on which a reflection film and a phosphor layer 64 are formed, and a circular substrate having a motor 66 at the center and capable of rotation control. The reflective film of the fluorescent plate 67 is a metal film or a dielectric film that reflects visible light, and is formed on an aluminum substrate. Further, a phosphor layer 64 is formed on the reflective film. In the phosphor layer 64, a Ce-activated YAG yellow phosphor that is excited by blue light and emits yellow light containing green and red components is formed. A typical chemical structure of the crystal matrix of this phosphor is Y 3 Al 5 O 12 . The phosphor layer 64 is formed in an annular shape.

  The phosphor layer 64 excited by the spot light emits yellow light including green and red component lights. The fluorescent plate 67 is an aluminum substrate, and by rotating, the temperature rise of the phosphor layer 64 due to excitation light can be suppressed, and the fluorescence conversion efficiency can be stably maintained. The light incident on the phosphor layer 64 fluoresces the green and red component color light and exits the fluorescent plate 67. Further, the light emitted to the reflection film side is reflected by the reflection film and emitted from the fluorescent screen 67. The green and red color lights emitted from the fluorescent plate 67 become natural light, are again collected by the condenser lenses 62 and 63, converted into substantially parallel light, and then transmitted through the dichroic mirror 61.

  On the other hand, 18% of the P-polarized blue light transmitted through the dichroic mirror 61 is incident on the condenser lens 68, which is the second condensing element, and is condensed. The focal length of the condenser lens 68 is set to be 40 degrees or less, and a condensing spot is formed in the vicinity of the reflecting plate 71. The condensed light collected by the condenser lens 68 is incident on the second diffusion plate 69. The second diffusion plate 69 diffuses incident light to make the light intensity distribution uniform, and eliminates speckles in the laser light. The second diffusion plate 69 is formed by forming a diffusion surface with a fine uneven shape on a thin glass surface. The second diffusion plate 69 has a diffusion angle of about 4 degrees with a single transmitted light to the diffusion surface, and maintains the polarization characteristics.

  The light transmitted through the second diffusion plate 69 is incident on a quarter wavelength plate 70 that is a second retardation plate. The quarter-wave plate 70 is a retardation plate whose phase difference becomes a quarter wavelength near the emission center wavelength of the semiconductor laser 51. The quarter-wave plate 70 is arranged with an optical axis of 45 degrees when the P polarization direction in FIG. 4 is 0 degree. The quarter-wave plate 70 is a thin film retardation plate that utilizes birefringence by oblique deposition of a dielectric material. The thin film retardation plate is made of an inorganic material, and is excellent in durability and reliability as in the case of an inorganic optical crystal such as quartz.

  The light that has been transmitted through the quarter-wave plate 70 and converted into circularly polarized light is inverted in phase by the reflective plate 71 on which a reflective film such as aluminum or a dielectric multilayer film is formed, and becomes divergent light by reversely circularly polarized light. , Transmitted through the quarter-wave plate 70 and converted to S-polarized light. Further, since a member that disturbs the polarization is not disposed between the quarter-wave plate 70 and the reflection plate 71, the P-polarized light can be converted to the S-polarized light with high efficiency.

  The S-polarized light converted by the quarter-wave plate 70 is again diffused by the second diffusion plate 69, converted into parallel light by the condenser lens 68, and reflected by the dichroic mirror 61.

  In this way, the fluorescent light from the fluorescent plate 67 and the blue light that has been efficiently polarized and converted are combined by the dichroic mirror 61 and emitted as white light. Good white balance emission characteristics can be obtained by yellow light containing green and red components of fluorescent light emission and blue light of the semiconductor laser 51. Even if this emission spectrum characteristic is separated into three primary color lights of blue, green and red by the optical system of the projection display device, monochromatic light having a desired chromaticity coordinate can be obtained.

  In the first embodiment of the present disclosure, the blue light band transmittance of the dichroic mirror 29 determines the blue light separation ratio, and the separation ratio slightly varies. On the other hand, in the second embodiment of the present disclosure, the separation ratio of the blue light transmitted and reflected by the dichroic mirror 61 is controlled using the half-wave plate 58 that can adjust the arrangement angle of the optical axis. The variation is very small. For this reason, the variation of the white balance characteristic becomes very small.

  Although the half-wave plate 58 has been described using a thin film phase difference plate, a fine structure phase difference plate using birefringence generated in a fine periodic structure equal to or less than the wavelength of light may be used.

  In the second embodiment, the half-wave plate 58 is used as the first retardation plate. However, the half-wave plate 58 is arranged so that the polarized light emitted from the semiconductor laser 51 becomes S-polarized light, and ¼ as the first retardation plate. A wave plate may be used to adjust the arrangement angle of the optical axis so that the S-polarized component and the P-polarized component of the blue light after transmission have a predetermined ratio.

  In the second embodiment, as shown in FIG. 4, the configuration in which the half-wave plate 58 is disposed at the position where the diverging light is incident is described. However, the half-wave plate is disposed at the position where the condensed light is incident. 58 may be arranged. For example, the half-wave plate 58 may be disposed before the condensed light reflected by the mirror 57 is collected.

  As described above, the light source device according to the present disclosure is configured so that light from a plurality of semiconductor lasers is arranged at a constant ratio by a small ½ wavelength plate arranged at a position where condensed light or divergent light is incident and a dichroic mirror. Polarized light is separated and polarized light, and green light and yellow light, including red light, and other blue light are efficiently collected and combined to obtain white light. A compact, highly efficient and inexpensive light source device can be configured.

(Embodiment 3)
FIG. 6 is a diagram illustrating a configuration of the first projection display apparatus according to the third embodiment of the present disclosure. As an image forming element, an active matrix transmissive liquid crystal panel which is a TN mode or a VA mode and has a thin film transistor formed in a pixel region is used.

  The light source device 40 includes a blue semiconductor laser 21, a heat radiating plate 22, a condenser lens 23, a heat sink 24, lenses 26 and 27, a first diffuser plate 28, a dichroic mirror 29, condenser lenses 30 and 31, a reflective film and a fluorescent film. A fluorescent plate 35 composed of an aluminum substrate 33 on which a body layer 32 is formed and a motor 34, a condenser lens 36, a second diffuser plate 37, a quarter-wave plate 38, and a reflector plate 39. Since the above is the light source device 40 according to the first embodiment of the present disclosure, the redundant description thereof is omitted.

  The projection display device 80 according to the third embodiment further includes a first lens array plate 200, a second lens array plate 201, a polarization conversion element 202, a superimposing lens 203, a blue reflecting dichroic mirror 204, and a green reflecting lens. Dichroic mirror 205, reflection mirrors 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 plate 220, 221 and 222, a color combining prism 223 including a red reflecting dichroic mirror and a blue reflecting dichroic mirror, and a projection lens 224.

  White light from the light source device 40 enters the first lens array plate 200 composed of a plurality of lens elements. The light beam incident on the first lens array plate 200 is divided into a number of light beams. A large number of the divided light beams converge on the second lens array plate 201 composed of a plurality of lenses. The lens elements of the first lens array plate 200 have an opening shape similar to the liquid crystal panels 217, 218, and 219. The focal length of the lens elements of the second lens array plate 201 is determined so that the first lens array plate 200 and the liquid crystal panels 217, 218, and 219 have a substantially conjugate relationship.

  The light emitted from the second lens array plate 201 enters the polarization conversion element 202. The polarization conversion element 202 includes a polarization separation prism and a half-wave plate, and converts natural light from the light source into light of one polarization direction. Since fluorescent light is natural light, it is polarized in one polarization direction, but blue light is incident as S-polarized light, and is emitted as S-polarized light without being subjected to polarization conversion.

  The light from the polarization conversion element 202 enters the superimposing lens 203. The superimposing lens 203 is a lens for superimposing and illuminating light emitted from the lens elements of the second lens array plate 201 on the liquid crystal panels 217, 218, and 219. The first lens array plate 200, the second lens array plate 201, the polarization conversion element 202, and the superimposing lens 203 are used as an illumination optical system.

  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 elements. 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.

  The three liquid crystal panels 217, 218, and 219 change the polarization state of the incident light by controlling the voltage applied to the pixels according to the video signal, and the transmission axes on both sides of the liquid crystal panels 217, 218, and 219 are mutually different. Light is modulated by a combination of incident-side polarizing plates 214, 215, and 216 and outgoing-side polarizing plates 220, 221, and 222 that are arranged so as to be orthogonal to each other, thereby forming 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).

  Since the light source device is composed of a plurality of solid-state light sources and emits white light with high efficiency and good white balance, a long-life and high-brightness projection display device can be realized. In addition, since the image forming element uses three liquid crystal panels that use polarized light instead of the time-division method, color reproduction is excellent, 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 separates the P-polarized light from the semiconductor laser light at a constant intensity ratio by using the solid-state light source that is a semiconductor laser and the dichroic mirror. The white light is obtained by synthesizing the yellow light containing green and red components excited by the light of the blue light and the blue light obtained by efficiently converting the separated light with a small quarter-wave plate. A light source device that can be used is used. Therefore, a small and inexpensive projection display device can be configured. Although the light source device 40 shown in FIG. 1 is used as the light source device, the light source device 72 shown in FIG. 4 may be used. In this case, the light source device has a very small variation in white balance of the emitted white light, and an inexpensive light source device and projection display device can be configured.

  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 4)
FIG. 7 is a second projection display apparatus according to the fourth embodiment of the present disclosure. The second projection display device 90 uses three DMDs as image forming elements.

  The light source device 40 includes a blue semiconductor laser 21, a heat radiating plate 22, a condenser lens 23, a heat sink 24, lenses 26 and 27, a first diffuser plate 28, a dichroic mirror 29, condenser lenses 30 and 31, a reflective film and a fluorescent film. A fluorescent plate 35 composed of an aluminum substrate 33 on which a body layer 32 is formed and a motor 34, a condenser lens 36, a second diffuser plate 37, a quarter-wave plate 38, and a reflector plate 39. The above is the light source device 40 according to the first embodiment of the present disclosure.

  The white light emitted from the light source device 40 enters the condenser lens 100 and is condensed on the rod 101. Light incident on the rod 101 is reflected a plurality of times inside the rod, so that the light intensity distribution is uniformed and emitted. Light emitted from the rod 101 is collected by the relay lens 102, reflected by the reflection mirror 103, then transmitted through the field lens 104, and enters the total reflection prism 105. Here, the condensing lens 100, the rod 101, the relay lens 102, the reflecting mirror 103, and the field lens 104 are an example of an illumination optical system.

  The total reflection prism 105 is composed of two prisms, and a thin air layer 106 is formed on the adjacent surfaces of the prisms. The air layer 106 totally reflects light incident at an angle greater than the critical angle. The light from the field lens 104 is reflected by the total reflection surface of the total reflection prism 105 and enters the color prism 107.

  The color prism 107 is composed of three prisms, and a blue reflecting dichroic mirror 108 and a red reflecting dichroic mirror 109 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 108 and the red reflecting dichroic mirror 109 of the color prism 107, and is incident on DMDs 110, 111, and 112, respectively. The DMDs 110, 111, and 112 deflect the micromirror according to the video signal and reflect the light into the light incident on the projection lens 113 and the light traveling outside the effective range of the projection lens 113. The light reflected by the DMDs 110, 111, and 112 passes through the color prism 107 again. In the process of passing through the color prism 107, the separated blue, red, and green color lights are combined and enter the total reflection prism 105.

  Since the light incident on the total reflection prism 105 is incident on the air layer 106 at a critical angle or less, it is transmitted and incident on the projection lens 113. In this manner, the image light formed by the DMDs 110, 111, and 112 is enlarged and projected on a screen (not shown).

  Since the light source device is composed of a plurality of solid light sources and emits white light with high efficiency and good white balance, a long-life and high-brightness projection display device can be realized. In addition, since DMD is used for the image forming element, a projection display device having higher light resistance and heat resistance than the 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 apparatus according to the present disclosure separates the P-polarized light from the semiconductor laser light at a constant intensity ratio by using the solid-state light source that is a semiconductor laser and the dichroic mirror. The white light is obtained by synthesizing the yellow light containing green and red components excited by the light of the blue light and the blue light obtained by efficiently converting the separated light with a small quarter-wave plate. A light source device that can be used is used. Therefore, a small and inexpensive projection display device can be configured. Although the light source device 40 shown in FIG. 1 is used as the light source device, the light source device 72 shown in FIG. 4 may be used. In this case, the light source device has a very small variation in white balance of the emitted white light, and an inexpensive light source device and projection display device can be configured.

  As described above, Embodiments 1 to 4 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments that have been changed, replaced, added, omitted, and the like.

  The present disclosure can be applied to a light source device of a projection display device using an image forming element.

21, 51 Semiconductor laser 22, 52 Heat sink 23, 53 Condensing lens 24, 54 Heat sink 25, 55 Light flux 26, 27 Lens 28, 60 First diffuser 29, 61 Dichroic mirror 30, 31, 36, 56, 59, 62, 63, 68 Condenser lens 32, 64 Phosphor layer 33, 65 Aluminum substrate 34, 66 Motor 35, 67 Fluorescent plate 37, 69 Second diffuser plate 38 1/4 wavelength plate 39, 71 Reflector plate 40, 72 Light source device 57 Mirror 58 1/2 wavelength plate 70 1/4 wavelength plate 80, 90 Projection display device 100 Condensing lens 101 Rod 102, 209, 210 Relay lens 103, 206, 207, 208 Reflection mirror 104, 211, 212, 213 Field Lens 105 Total reflection prism 106 Air layer 107 Color Prisms 108,204 dichroic mirror 109 red reflection blue reflecting dichroic mirror 110, 111, 112 DMD
113, 224 Projection lens 200 First lens array plate 201 Second lens array plate 202 Polarization conversion element 203 Superposition lens 205 Green reflecting dichroic mirror 214, 215, 216 Incident side polarizing plate 217, 218, 219 Liquid crystal panel 220 , 221,222 Output side polarizing plate 223 Color composition prism

Claims (16)

  1. A solid light source;
    A condensing element that condenses light from the solid-state light source;
    A phase difference plate that converts linearly polarized light into circularly polarized light;
    A reflector,
    The said phase difference plate is a light source device arrange | positioned in the position into which condensing light and diverging light inject between the said condensing element and the said reflecting plate.
  2.   The light source device according to claim 1, wherein the retardation plate is a ¼ wavelength plate.
  3. A solid light source;
    A phase difference plate that converts the direction of polarization of light from the solid-state light source and controls the light of the P-polarized light and the S-polarized light component at a certain ratio;
    A dichroic mirror that polarization-separates light from the retardation plate,
    The said phase difference plate is a light source device arrange | positioned in the position into which condensing light or diverging light injects between the said solid light source and the said dichroic mirror.
  4.   The light source device according to claim 3, wherein the retardation plate is a half-wave plate or a quarter-wave plate.
  5.   The light source device according to claim 1, wherein the phase difference plate is disposed at a position where an incident light angle is 40 degrees or less.
  6.   4. The light source device according to claim 1, wherein the retardation plate is a thin film retardation plate using birefringence by oblique vapor deposition, or a fine structure retardation plate using birefringence by a fine structure.
  7. A solid light source;
    A first retardation plate that converts the direction of polarization of light from the solid-state light source and controls the light of the P-polarized light and the S-polarized light component at a constant ratio;
    A dichroic mirror for polarizing and separating light from the first retardation plate;
    A condensing element that condenses the light from the dichroic mirror;
    A second retardation plate that converts linearly polarized light into circularly polarized light;
    A reflector,
    The first retardation plate is disposed between the solid-state light source and the dichroic mirror at a position where condensed light or divergent light is incident,
    The second phase difference plate is a light source device arranged between the light collecting element and the reflecting plate at a position where condensed light and divergent light are incident.
  8.   The light source device according to claim 7, wherein the first retardation plate is a half-wave plate or a quarter-wave plate.
  9.   The light source device according to claim 7, wherein the second retardation plate is a ¼ wavelength plate.
  10.   The light source device according to claim 7, wherein at least one of the first retardation plate and the second retardation plate is disposed at a position where an incident light angle is 40 degrees or less.
  11.   At least one of the first retardation plate and the second retardation plate is a thin film retardation plate using birefringence by oblique deposition, or a microstructured retardation plate using birefringence by a microstructure. The light source device according to claim 7.
  12.   The light source device according to claim 1, 3 or 7, wherein the solid-state light source is a blue semiconductor laser.
  13.   The light source device according to claim 1, wherein the light emitted from the solid light source is linearly polarized light.
  14. A light source;
    An illumination optical system for condensing light from the light source and illuminating the illuminated area;
    An image forming element that 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, wherein the light source is the light source device according to claim 1, 3 or 7.
  15.   The projection display device according to claim 14, wherein the image forming element is a liquid crystal panel.
  16.   The projection display apparatus according to claim 14, wherein the image forming element is a mirror deflection type digital micromirror device (DMD).
JP2017073479A 2016-07-12 2017-04-03 Light-source device and projection type display device Pending JP2018013764A (en)

Priority Applications (2)

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PH12017000156A PH12017000156A1 (en) 2016-07-12 2017-05-25 Light source device and projection display apparatus
US15/615,444 US10838289B2 (en) 2016-07-12 2017-06-06 Light source device and projection display apparatus including plural light sources, and a lens condensing light from the plural light sources into one spot
CN201710519311.2A CN107608166A (en) 2016-07-12 2017-06-29 Light supply apparatus and projection type image display apparatus

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WO2019225052A1 (en) * 2018-05-22 2019-11-28 株式会社Jvcケンウッド Projector and multi-projection system
WO2020012751A1 (en) * 2018-07-11 2020-01-16 パナソニックIpマネジメント株式会社 Light source device and projection display device

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JP2019174516A (en) * 2018-03-27 2019-10-10 セイコーエプソン株式会社 Optical unit and display
WO2020186843A1 (en) * 2019-03-20 2020-09-24 青岛海信激光显示股份有限公司 Laser light source and laser projection apparatus

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JP5874058B2 (en) * 2010-12-06 2016-03-01 パナソニックIpマネジメント株式会社 Light source device and projection display device
DE102012212436A1 (en) * 2012-07-16 2014-01-16 Osram Gmbh Light module for a projection device and method for generating the blue component in a light module for a projection device
CN103913936B (en) * 2012-12-28 2016-12-07 深圳市绎立锐光科技开发有限公司 Light-emitting device and optical projection system
US20170082912A1 (en) * 2014-03-31 2017-03-23 Nec Display Solutions, Ltd. Light source device and projector
US9759991B2 (en) * 2014-09-16 2017-09-12 Texas Instruments Incorporated Laser illumination on phosphor for projection display

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019225052A1 (en) * 2018-05-22 2019-11-28 株式会社Jvcケンウッド Projector and multi-projection system
WO2020012751A1 (en) * 2018-07-11 2020-01-16 パナソニックIpマネジメント株式会社 Light source device and projection display device

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