WO2018133328A1 - 一种光转换元件、光源系统及显示装置 - Google Patents

一种光转换元件、光源系统及显示装置 Download PDF

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Publication number
WO2018133328A1
WO2018133328A1 PCT/CN2017/090315 CN2017090315W WO2018133328A1 WO 2018133328 A1 WO2018133328 A1 WO 2018133328A1 CN 2017090315 W CN2017090315 W CN 2017090315W WO 2018133328 A1 WO2018133328 A1 WO 2018133328A1
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WIPO (PCT)
Prior art keywords
light
region
conversion element
incident
emitting unit
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Ceased
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PCT/CN2017/090315
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English (en)
French (fr)
Inventor
胡飞
郭祖强
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Publication of WO2018133328A1 publication Critical patent/WO2018133328A1/zh
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a light conversion element, a light source system, and a display device.
  • the laser-excited phosphor wheel that excites the rotating color wheel or the activated phosphor sheet enhances the brightness compared to the existing LED solid-state light source or bulb, and the image display is lower than the pure laser source. better result.
  • the laser-excited phosphor technology has also encountered unprecedented problems.
  • the light source is used in a portable device such as a micro-projection, a large-volume problem cannot be overcome; on the other hand, the light source is The light efficiency is not high enough. If the light efficiency is further improved, new components need to be added, which will increase the volume and cost of the light source. Moreover, if the current or voltage is increased without adding new components, this will be The life of solid state light sources is a great test.
  • the technical problem to be solved by the present invention is to provide a light conversion element, a light source system and a display device, which can reduce the volume of the product, reduce the cost, and improve the utilization of light to achieve high brightness display.
  • the present invention adopts a technical solution to provide a light conversion element including an incident area, a light emitting unit, a reflective area, a light exiting area, and a light recovery area, the incident area, the light emitting The unit, the reflective area, and the light exiting area are enclosed to form a spatial structure, and the reflective area is disposed around the light emitting unit;
  • the incident area is used for incident excitation light
  • the light emitting unit is configured to receive incident excitation light to generate a laser light
  • a reflective area for reflecting at least a portion of the laser light to a light exiting region and reflecting excitation light that is not absorbed by the light emitting unit to the light emitting unit;
  • a light exiting area for emitting at least a portion of the received laser light
  • the light recovery region serves to reflect excitation light and/or laser light incident to the light recovery region.
  • the dichroic element is disposed on the incident region for selectively transmitting the excitation light and reflecting the received laser light.
  • the aspect ratio of the light exiting area matches the aspect ratio of the projection screen.
  • the light-emitting area has an aspect ratio of 4:3 or 16:9.
  • the light exiting area is square, the light exiting area and the light recovery area are located on the same plane, and the light recovery area is connected to the edge of the light exiting area.
  • the light exiting area is a spherical crown surface or a paraboloid surface, and the light recovery area is disposed along a circumferential direction of the light exiting area;
  • the light conversion element further comprises:
  • An exit lens is disposed on one side of the light exiting region for collecting light emitted from the light exiting region.
  • the light recovery region is a spherical crown surface or a paraboloid
  • the incident region, the light emitting unit and the light exiting region of the light conversion element are located at a spherical center position of the spherical crown surface or a focal position of the paraboloid surface;
  • a light transmitting region is disposed on the light recovery region.
  • the light-emitting unit uses a pure phase fluorescent ceramic or a composite ceramic material.
  • a light source system comprising:
  • a light conversion element for receiving the dimmed excitation light and generating a laser light, which comprises the light conversion element described above;
  • a collecting component for receiving the laser light emitted by the light converting component.
  • the light source system further includes:
  • a heat sink for dissipating heat from the light source.
  • another technical solution adopted by the present invention is to provide a display device including a light source system as described above.
  • the present invention provides a light conversion element, a light source system, and a display device including an incident area, a light emitting unit, a reflective area, a light exiting area, and a light recovery area.
  • the incident area, the light emitting unit, the reflective area, and the light exit area are enclosed to form a spatial structure, and the reflective area is disposed around the light emitting unit.
  • the incident region is for incident excitation light
  • the illumination unit is for receiving incident excitation light to generate a laser beam
  • the reflection region is for reflecting at least part of the laser light to the light exit region and reflecting the excitation light that is not absorbed by the light emitting unit to the light.
  • the unit, the light exiting area is for emitting at least a portion of the laser light
  • the light recovery area is for reflecting excitation light and/or received laser light incident on the light recovery region. Therefore, the present invention can reduce the volume of the product, reduce the cost, and improve the utilization of light to achieve high brightness display.
  • FIG. 1 is a schematic structural diagram of a light source system according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a light source and a heat sink
  • FIG. 3 is a schematic structural diagram of a light conversion element according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another optical conversion element according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of still another optical conversion element according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of still another optical conversion element according to an embodiment of the present invention.
  • FIG. 7 is a light path diagram of a light conversion element according to an embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of a light source system according to an embodiment of the present invention.
  • the light source system 10 of the present embodiment includes a heat sink 1, a light source 2, a light homogenizing element 3, a light conversion element 4, and a collecting element 5.
  • the light source 2 is used to emit excitation light.
  • the light source 2 is preferably a solid state light source.
  • Light source 2 is a laser source and/or an LED source.
  • the laser source may be in the form of a single laser or in the form of a laser array.
  • the LED light source can be in the form of a single LED or in the form of an LED array.
  • the light source 2 can also be other light sources, which are not limited herein.
  • the heat sink 1 is used to dissipate heat from the light source 2.
  • the light source 2 of the present embodiment preferably has a square structure, and includes a light-emitting surface 21, two side surfaces 22 and 23 adjacent to the light-emitting surface 21, and a side surface 24 opposite to the light-emitting surface 21.
  • the area of the light-emitting surface 21 is smaller than the area of the side surfaces 22 and 23.
  • the side surface 23 is fixed on the heat dissipating member 1, so that the contact area of the light source 2 and the heat dissipating member 1 can be increased, thereby contributing to heat dissipation of the light source 2.
  • the heat sink 1 is preferably a heat conducting plate.
  • the heat dissipating fins 12 may be disposed on one side of the heat conducting plate 11. as shown in picture 2.
  • the heat generated by the light source 2 is transmitted to the heat dissipating fins 12 through the heat conducting plate 11, and the heat dissipating fins 12 transfer heat to the outside air.
  • a heat pipe may be disposed on the heat dissipating fin 12, and part of the heat is transmitted to the outside through the heat pipe.
  • the light homogenizing element 3 is used to homogenize the excitation light emitted from the light source 2.
  • the light homogenizing element 3 may be a light homogenizing rod, a fly-eye lens or a fly-eye lens pair.
  • the shape of the homogenizing rod may be tapered or square, and the exit surface of the homogenizing rod may be set to a specific shape, and each lens unit of the fly-eye lens may be square or circular.
  • the light conversion element 4 includes an incident area 41, a light emitting unit 44, a reflective area 45, a light exiting area 43, and a light recovery area 42.
  • the incident region 41, the light emitting unit 44, the reflective region 45, the light exiting region 43, and the light recovery region 42 are enclosed to form a spatial structure, and the reflective region 45 is disposed around the light emitting unit 44.
  • the incident region 41 is used to incident excitation light, that is, to receive light after being homogenized by the light homogenizing element 3.
  • the light emitting unit 44 is disposed inside the light conversion element 4 for receiving incident excitation light to generate a laser light.
  • the reflective region 45 serves to reflect at least a portion of the laser light to the light exit region 43 and to reflect the excitation light that is not absorbed by the light emitting unit 44 to the light emitting unit 44.
  • the reflection area 45 is disposed between the incident area 41 and the exit area 43, and is located on the side wall of the light conversion element 4.
  • the reflective region 45 may be coated with a material such as silver, aluminum oxide or the like on the light conversion element 4.
  • the light exiting area 43 is for emitting at least a portion of the laser light.
  • the light recovery region 42 is configured to reflect excitation light and/or received laser light incident on the light recovery region, so that the laser light is emitted from the light exit region after being reflected by the reflective region, and the excitation light passes through the
  • the laser light generated by the conversion of the light-emitting unit is emitted from the light-emitting region, that is, the excitation light incident to the light-recovering region and/or the laser light is received to recover the excitation light and/or the laser light.
  • the light reflected by the light recovery area 42 includes the following three types:
  • the first type the reflection is affected by the laser. That is, the laser light that has been converted by the light-emitting unit 44 is not entirely emitted from the light-emitting region 43, but is partially incident on the light-recovering region 42. At this time, the light recovery region 42 emits the incident portion by laser light for recycling.
  • the third type reflecting excitation light and receiving laser light.
  • This case is combined with the first case and the second case described above, that is, the laser light that is not emitted from the light exiting region 43 and the excitation light that is not converted by the light emitting unit 44 are incident on the light recovery region 42.
  • the recovery region 42 reflects and recovers the excitation light and the laser light.
  • the collecting member 5 is for receiving the laser light emitted from the light converting element 4.
  • the collecting element 5 is preferably a collecting lens group.
  • the light source system of the embodiment of the present invention collects the incident excitation light and/or the laser light by providing the light recovery region 42 so that the incident excitation light and/or the received laser light can be reflected back to the inside of the light-emitting unit 44 for reuse.
  • the light recovery region 42 so that the incident excitation light and/or the received laser light can be reflected back to the inside of the light-emitting unit 44 for reuse.
  • the incident region 41 is provided with a dichroic element 411 for selectively transmitting excitation light and reflecting the received laser light. That is, the dichroic element 411 functions as a filter. In the present embodiment, the dichroic element 411 filters from both the color and the angle.
  • the color filter is such that the dichroic element 411 is arranged to allow only light of a specific color to pass, while reflecting light of other colors, for example, only blue light is allowed to pass, and light of other colors is reflected, whereby light emitted from the light source 2 can be emitted. Make a color choice.
  • the angle filtering is such that the dichroic element 411 is arranged to allow only a certain angle of light to pass, while reflecting other angles of light.
  • the angle of the laser light emitted may be approximately zero degrees, and the laser light formed by the light-emitting unit 44 is in a diverging state, and the angle is large.
  • the dichroic element 411 is provided with an angle selective reflection layer for transmitting light of a small angle and reflecting a large angle of light, so that the excitation light emitted by the light source 2 can be transmitted and reflected through the light emitting unit. 44 converted laser.
  • the angle selective reflective layer can be a filter or a filter. More specifically, when the angle selective reflection layer is a filter film, the dichroic element 411 may be a film that transmits laser light by transmitting excitation light, or may be a film that transmits excitation light to reflect other light.
  • the light emitted from the light source 2 can pass through the dichroic element 411, and the laser light that is reflected from the light recovery region 42 and passes through the light-emitting unit 44 again is further reflected by the dichroic element 411. Thereby, the loss of light can be reduced, and the utilization of light can be ensured.
  • the light-emitting unit 44 is any ceramic body that generates laser light under excitation of excitation light.
  • the light-emitting unit 44 uses a pure phase fluorescent ceramic or composite ceramic material, and is a solid-state element having a specific shape such as a rectangular parallelepiped, a cube or a sphere, or the like.
  • a pure phase fluorescent ceramic it may specifically be various oxide ceramics, nitride ceramics or oxynitride ceramics, and a luminescent center is formed by incorporating a trace amount of activator elements such as lanthanides in the preparation process of the ceramic. .
  • the light-emitting unit 44 is a composite ceramic material, it is made of a transparent or translucent ceramic as a matrix, and luminescent ceramic particles such as phosphor particles are distributed in the ceramic matrix.
  • the transparent or translucent ceramic substrate may be various oxide ceramics such as alumina ceramics and Y3Al5O12 ceramics, nitride ceramics such as aluminum nitride ceramics, and oxynitride ceramics.
  • the ceramic substrate may also be a pure phase fluorescent ceramic, that is, the ceramic substrate itself has an activator capable of emitting a laser under irradiation of excitation light.
  • the phosphor of the light-emitting unit 44 may be a mixture of a green phosphor and a red phosphor, or may be a yellow phosphor, or may be a phosphor disposed in a partition, wherein phosphors of different colors are disposed in different regions.
  • the shape of the light conversion element 4 is preferably a rectangular parallelepiped or a rectangular parallelepiped, so that the plating of the incident region 41 or the like is made simpler.
  • the aspect ratio of the light exiting region 43 matches the aspect ratio of the projection screen. More specifically, the aspect ratio of the light exiting region 43 is preferably 4:3 or 16:9. This makes it possible to match the length and width of the emitted laser light with the ratio of the length and width of the projection screen, so that the uniformity of light is better and the light efficiency is higher.
  • the light exiting area 43 is square, the light exiting area 43 and the light recovery area 42 are on the same plane, and the light recovery area 42 is connected to the edge of the light exiting area 43.
  • the incident region 41 and the light exiting region 43 may be located at any position of the light conversion element 4.
  • the light conversion element 4 is a square body of six sides, and the incident area 41 and the light exit area 43 are provided on the opposite side faces of the light conversion element 4.
  • the light recovery region 42 and the light exit region 43 are located on the same side surface, the light exit region 43 is disposed at the center of the side surface, and the light recovery region 42 is disposed around the light exit region 43.
  • the light emitting unit 44 is disposed inside the light conversion element 4.
  • the reflective area 45 is preferably disposed between the light recovery area 42 and the light exit area 43 and disposed around the light emitting unit 44.
  • the incident region 41 and the light exit region 43 may also be disposed on adjacent two sides, as shown in FIG. Thereby, the number of times of light reflection at the light-emitting unit 44 can be increased, so that the emitted light is more uniform, and the effective light is more, and the brightness is improved.
  • the incident area 41 and the light exit area 43 may also be disposed on the same side.
  • the incident area 41 and the light exiting area 43 are disposed on the same side and there is an overlapping area, the overlapping area transmits visible light.
  • the light recovery region 42 and the light exit region 43 are disposed on the same plane. More specifically, in the same plane, the light recovery region 42 is a reflective layer disposed at a position other than the light exiting region 43, and the reflective layer is made of a material such as silver or alumina.
  • the present invention recovers the unexposed laser light by the light recovery region 42 for reuse, thereby improving the light utilization efficiency, thereby improving the brightness of the light source system 10.
  • FIG. 5 is a schematic structural diagram of another optical conversion component according to an embodiment of the present invention.
  • the light conversion element 50 of the present embodiment still includes an incident region 51, a light exit region 53, a light emitting unit 54, and a light recovery unit 52.
  • the light conversion element 50 of the present embodiment is different from the light conversion element 4 described above in that the light exiting region 53 of the light conversion element 50 of the present embodiment is a spherical or parabolic surface, and the light recovery region 52 is disposed at The position of the spherical or parabolic surface of the spherical portion 53 is not provided.
  • the embodiment may omit the reflective area 45 as shown in Figures 3 and 4.
  • the light conversion element 50 of the present embodiment further includes a light exit lens 56. It is disposed on one side of the light exiting region 53 for condensing the laser light emitted from the light exiting region 53.
  • the relatively divergent laser light emitted from the light exiting region 53 forms concentrated parallel light, thereby improving the light utilization efficiency.
  • FIG. 6 is a schematic structural diagram of still another optical conversion component according to an embodiment of the present invention.
  • the light conversion element 60 of the present embodiment still includes an incident region 61, an emission region 63, a light emitting unit 64, a light recovery unit 62, and a reflection region 65.
  • the light conversion element 60 of the present embodiment is different from the light conversion element 4 described above in that the light exiting region 63 and the light recovery region 62 of the light conversion element 60 of the present embodiment are disposed on two different faces.
  • the light recovery area 62 is a spherical crown surface or a paraboloid surface.
  • the incident region 61, the light-emitting unit 64, the light-emitting region 63, and the reflective region 65 are located at a spherical center position of the spherical coronal plane or a focal position of the paraboloid.
  • the light recovery region 62 is provided with a light transmitting region 66 which is disposed at a center position of the spherical crown surface or the paraboloid surface, and the light recovery region 62 is disposed at a position where the spherical surface or the paraboloid is not provided with the light transmitting region 66.
  • the light transmissive region 66 can be a through hole or made of a light transmissive material.
  • the light exiting region 63 is located on one side of the concave surface of the spherical or parabolic surface, and the light of the light exiting region 63 is reflected by the light returning light emitting region 62, and light of a small angle is emitted from the light transmitting region 66.
  • the specific optical path diagram is shown in Figure 7.
  • Embodiments of the present invention also provide a display device including the foregoing light source system.
  • the display device is a micro-injection, a laser TV, an educational machine, and the like.
  • the present invention is capable of achieving high brightness display at a lower cost.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

一种光转换元件、光源系统及显示装置。光转换元件（4）包括入射区域（41）、发光单元（44）、反射区域（45）、出光区域（43）和光回收区域（42），入射区域（41）、发光单元（44）、反射区域（45）以及出光区域（43）围合形成一空间结构，且反射区域（45）围绕发光单元（44）设置。其中：入射区域（41）用于入射激发光；发光单元（44）用于接收入射的激发光以产生受激光；反射区域（45）用于将至少部分受激光反射至出光区域（43）以及将未被发光单元（44）吸收的激发光反射至发光单元（44）；出光区域（43）用于出射至少部分受激光；光回收区域（42）用于反射入射至光回收区域（42）的激发光和/或受激光，从而能够在缩小产品的体积、降低成本的同时提高光的利用率以实现高亮度显示。

Description

一种光转换元件、光源系统及显示装置 技术领域
本发明涉及显示技术领域，特别是涉及一种光转换元件、光源系统及显示装置。
 背景技术
现有的投影光源中，除了采用灯泡和纯激光作为光源，还有一种较为流行也是广受欢迎的光源技术：采用激发光激发旋转的荧光粉色轮或者激发固定的荧光粉片，以产生时序光或者白光出射。
 技术问题
上述技术中，激光激发旋转的色轮或激发固定的荧光粉片的激光激发荧光粉技术相较于现有的LED固态光源或者灯泡提高了亮度，相较于纯激光光源成本更低，图像显示效果更好。随着显示的要求的提高，该激光激发荧光粉技术也遇到了前所未有的问题，一方面，该光源用在微投等便携设备时，体积大的问题将无法克服；另一方面，该光源的光效不够高，如果进一步提高光效，需要增加新的元部件，这样势必增加光源的体积和成本；再者，如果在不增加新的元件的情况下，通过增加电流或电压，这将对固态光源的寿命是一个极大的考验。
 技术解决方案
本发明主要解决的技术问题是提供一种光转换元件、光源系统及显示装置，能缩小产品的体积、降低成本的同时提高光的利用率以实现高亮度显示。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种光转换元件，该光转换元件包括入射区域、发光单元、反射区域、出光区域和光回收区域，所述入射区域、所述发光单元、所述反射区域以及所述出光区域围合形成一空间结构，且所述反射区域围绕所述发光单元设置；其中：
入射区域用于入射激发光；
发光单元用于接收入射的激发光以产生受激光；
反射区域用于将至少部分所述受激光反射至出光区域以及将未被所述发光单元吸收的激发光反射至所述发光单元；
出光区域用于出射至少部分所述受激光；
光回收区域用于反射入射至所述光回收区域的激发光和/或受激光。
其中，入射区域上设置二向色元件，用于选择性地透射所述激发光，并反射所述受激光。
其中，出光区域的长宽比与投影屏幕的长宽比相匹配。
其中，出光区域的长宽比为4：3或16：9。
其中，出光区域呈方形，所述出光区域和所述光回收区域位于同一平面且光回收区域与出光区域的边缘相连接。
其中，出光区域为球冠状面或抛物面，所述光回收区域沿着所述出光区域的周向设置；
其中，所述光转换元件还包括：
出光透镜，设置在所述出光区域的一侧，用于对从所述出光区域出射的出射光进行聚光。
其中，光回收区域为球冠状面或抛物面，所述光转换元件的入射区域、发光单元及所述出光区域位于所述球冠状面的球心位置或所述抛物面的焦点位置；
所述光回收区域上设置有透光区域。
其中，发光单元采用纯相的荧光陶瓷或复合陶瓷材料。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种光源系统，该光源系统包括：
光源，用于发出激发光；
匀光元件，用于对所述激发光进行匀光；
光转换元件，用于接收匀光后的激发光并产生受激光，其包括前文所述的光转换元件；
收集元件，用于接收所述光转换元件出射的受激光。
其中，光源系统还包括：
散热件，用于对所述光源进行散热。
为解决上述技术问题，本发明采用的又一个技术方案是：提供一种显示装置，该显示装置包括如前文所述的光源系统。
 有益效果
本发明的有益效果是：区别于现有技术的情况，本发明提供一种光转换元件、光源系统及显示装置，该光转换元件包括入射区域、发光单元、反射区域、出光区域以及光回收区域，入射区域、发光单元、反射区域以及出光区域围合形成一空间结构，且反射区域围绕发光单元设置。其中，入射区域用于入射激发光，发光单元用于接收入射的激发光以产生受激光，反射区域用于将至少部分受激光反射至出光区域以及将未被发光单元吸收的激发光反射至发光单元，出光区域用于出射至少部分受激光，光回收区域用于反射入射至光回收区域的激发光和/或受激光。因此，本发明能缩小产品的体积、降低成本的同时提高光的利用率以实现高亮度显示。
 附图说明
图1是本发明实施例提供的一种光源系统的结构示意图；
图2是光源与散热件的结构示意图；
图3是本发明实施例提供的一种光转换元件的结构示意图；
图4是本发明实施例提供的另一种光转换元件的结构示意图；
图5是本发明实施例提供的又一种光转换元件的结构示意图；
图6是本发明实施例提供的又一种光转换元件的结构示意图；
图7是本发明实施例提供的光转换元件的光路图。
 本发明的最佳实施方式
请参阅图1，图1是本发明实施例提供的一种光源系统的结构示意图。如图1所示，本实施例的光源系统10包括散热件1、光源2、匀光元件3、光转换元件4以及收集元件5。
其中，光源2用于发出激发光。本实施例中，光源2优选为固态光源。光源2为激光器光源和/或LED光源。其中，激光光源可以为单颗激光器的形式，也可以为激光器阵列的形式。同理，LED光源可以为单个LED的形式，也可以为LED阵列的形式。光源2还可以为其他光源，在此不作限制。
散热件1用于对光源2进行散热。具体而言，本实施例的光源2优选为方形结构，包括出光面21、与出光面21相邻的两侧面22和23以及与出光面21相对的侧面24。其中，出光面21的面积小于侧面22和23的面积。本实施例中，优选的，侧面23固定在散热件1上，这样可以增加光源2与散热件1的接触面积，从而有助于光源2的散热。
本实施例中，散热件1优选为导热板。更进一步的，还可以在导热板11的一侧设置散热齿片12。如图2所示。光源2产生的热量通过导热板11传递到散热齿片12上，散热齿片12将热量传递到外界空气中。另外，散热齿片12上还可以设置热导管，部分热量通过热导管传递到外界。
匀光元件3用于对光源2发出的激发光进行匀光。本实施例中，匀光元件3可以是匀光棒、复眼透镜或复眼透镜对。其中，匀光棒的形状可以为锥形或者方形，匀光棒的出口面可以设定为特定形状，复眼透镜的每个透镜单元可以是方形也可以是圆形。
匀光之后的光进入光转换元件4。请一起参阅图3所示，光转换元件4包括入射区域41、发光单元44、反射区域45、出光区域43以及光回收区域42。
入射区域41、发光单元44、反射区域45、出光区域43和光回收区域42围合形成一空间结构，且反射区域45围绕发光单元44设置。
其中，入射区域41用于入射激发光，也就是接收经过匀光元件3匀光之后的光。发光单元44设置在光转换元件4的内部，用于接收入射的激发光以产生受激光。反射区域45用于将至少部分受激光反射至出光区域43以及将未被发光单元44吸收的激发光反射至发光单元44。反射区域45设置在入射区域41和出射区域43之间，并位于光转换元件4的侧壁上。反射区域45可以是银、氧化铝等材料涂覆在光转换元件4上。
出光区域43用于出射至少部分受激光。光回收区域42用于反射入射至所述光回收区域的激发光和/或受激光，以使所述受激光经过所述反射区域的反射后从所述出光区域出射，所述激发光经过所述发光单元转换产生的受激光从所述出光区域出射，即反射入射至光回收区域的激发光和/或受激光以回收激发光和/或受激光。具体而言，光回收区域42反射的光包括以下三种：
第一种：反射受激光。也就是说，经过发光单元44转换后的受激光未全部从出光区域43出射，而是有部分入射到光回收区域42中。此时，光回收区域42将入射的该部分受激光发射，以回收重新利用。
第二种：反射激发光。也就是说，从入射区域41入射的激发光未全部被发光单元44转换为受激光，例如一部分激发光从发光单元44和反射区域45之间传输，该部分的激发光入射到光回收区域42中，此时光回收区域42将该部分的激发光进行反射，以回收重新利用。
第三种：反射激发光和受激光。该种情况是结合了前文所述的第一种情况和第二种情况，即存在未从出光区域43出射的受激光和未被发光单元44转换的激发光入射到光回收区域42中，光回收区域42将该些激发光和受激光一并反射回收。
收集元件5用于接收光转换元件4出射的受激光。收集元件5优选为收集透镜组。
因此，本发明实施例的光源系统通过设置光回收区域42来收集入射的激发光和/或受激光，使得入射的激发光和/或受激光可以反射回发光单元44内部进行再次利用。不需要增加其他元件，从而能缩小产品的体积、降低成本的同时提高光的利用率以实现高亮度显示。
本实施例中，入射区域41上设置二向色元件411，用于选择性地透射激发光，并反射受激光。即二向色元件411起到一个滤光的作用。本实施例中，二向色元件411从颜色和角度两个方面进行滤光。
首先，颜色滤光为二向色元件411设置为只允许特定颜色的光通过，而反射其他颜色的光，例如只允许蓝色光通过，其他颜色的光反射，由此可以对光源2发出的光进行颜色的选择。
其次，角度滤光为二向色元件411设置为只允许特定角度的光通过，而反射其他角度的光。这利用了光源2发出的光的角度和经过发光单元44后形成的受激光的角度不同的特点。例如，光源2为激光光源时，其发出的激光的角度可以近似为零度，而经过发光单元44后形成的受激光为发散状态的，角度较大。因此，本实施例在二向色元件411上设置有角度选择反射层，用于透射小角度的光，并反射大角度的光，这样就可以透射光源2发出的激发光，而反射经过发光单元44转换后的受激光。角度选择反射层可为滤光片或者滤光膜。更具体的，当角度选择反射层为滤光膜，二向色元件411可以为透射激发光反射受激光的膜，也可以是透射激发光反射其他光的膜。由此，光源2发出的光可以通过二向色元件411，而从光回收区域42反射回来再次经过发光单元44的受激光会进一步被二向色元件411反射。从而可以减小光的损失，保证光的利用率。
本实施例中，发光单元44为任意在激发光的激发下产生受激光的陶瓷体。优选的，发光单元44采用纯相的荧光陶瓷或复合陶瓷材料，并且是具有特定形状的固态元件，例如长方体、正方体或球体等。当其为纯相的荧光陶瓷时，具体可以是各种氧化物陶瓷、氮化物陶瓷或氮氧化物陶瓷，通过在陶瓷制备过程中掺入微量的激活剂元素，如镧系元素，形成发光中心。
当发光单元44为复合陶瓷材料时，其以透明或半透明的陶瓷作为基质，在陶瓷基质内分布着发光陶瓷颗粒，如荧光粉颗粒。透明或半透明陶瓷基质可以是各种氧化物陶瓷，如氧化铝陶瓷和Y3Al5O12陶瓷，也可以是氮化物陶瓷，如氮化铝陶瓷，还可以是氮氧化物陶瓷。
此外，陶瓷基质还可以是纯相的荧光陶瓷，即陶瓷基质本身具有激活剂，能够在激发光的照射下发出受激光。
其中，发光单元44的荧光粉可以为绿色荧光粉和红色荧光粉混合，也可以为黄色荧光粉，还可以是分区设置的荧光粉体，其中不同区设置不同颜色的荧光粉。
本实施例中，光转换元件4的形状优选为长方体或正方体，使得入射区域41等的镀膜更简单。
本实施例中，出光区域43的长宽比和投影屏幕的长宽比相匹配。更具体的，出光区域43的长宽比优选为4：3或16：9。这样可以使得出射的受激光的长和宽与投影屏幕的长和宽的比例相匹配，从而使得光的均匀性更好、光效更高。
其中，出光区域43呈方形，出光区域43和光回收区域42位于同一平面且光回收区域42与出光区域43的边缘相连接。
本实施例中，入射区域41和出光区域43可以位于光转换元件4的任意位置。如图3所示，光转换元件4为六面的方体，入射区域41和出光区域43设置在光转换元件4的两个对侧面上。并且光回收区域42与出光区域43位于同一个侧面上，出光区域43设置在该侧面的中心位置，光回收区域42设置在出光区域43的周围。发光单元44设置在光转换元件4的内部。反射区域45优选设置在光回收区域42与出光区域43之间，并围绕发光单元44设置。
在其他实施例中，入射区域41和出光区域43还可设置在相邻的两个侧面上，如图4所示。从而可以提高光在发光单元44的反射的次数，使得出射的光更均匀，并且有效光更多，提高亮度。
在其他实施例中，入射区域41和出光区域43还可设置同一个侧面上。当入射区域41和出光区域43设置在同一侧面上，并且有重叠区域时，重叠区域透射可见光。
由前文所述，光回收区域42和出光区域43是位于同一平面设置。更具体的，在同一个平面中，光回收区域42是设置在出光区域43以外的位置的反射层，反射层采用银、氧化铝等材料。
承前所述，本发明通过光回收区域42将未出射的受激光回收以再次利用，提高了光的利用率，从而提高了光源系统10的亮度。
请参阅图5，图5是本发明实施例提供的另一种光转换元件的结构示意图。如图5所示，本实施例的光转换元件50依然包括入射区域51、出光区域53、发光单元54以及光回收单元52。其中，本实施例的光转换元件50与前文所述的光转换元件4的不同之处在于：本实施例的光转换元件50的出光区域53为球冠状面或抛物面，光回收区域52设置在球冠状面或抛物面的未设置出光区域53的位置。由于出光区域53沿着出光区域53的周向设置，因此光回收区域52反射的光会向球冠状面的球心或抛物面的焦点位置聚集，即会集中反射回到发光单元54中，因此本实施例可以省去如图3和图4所示反射区域45。
进一步的，本实施例的光转换元件50还包括出光透镜56。其设置在出光区域53的一侧，用于对从出光区域53出射的受激光进行聚光。使得从出光区域53出射的较为发散的受激光形成聚集的平行光，从而提高光的利用率。
请参阅图6，图6是本发明实施例提供的又一种光转换元件的结构示意图。如图6所示，本实施例的光转换元件60依然包括入射区域61、出射区域63、发光单元64、光回收单元62以及反射区域65。其中，本实施例的光转换元件60与前文所述的光转换元件4的不同之处在于：本实施例的光转换元件60的出光区域63和光回收区域62设置在两个不同的面上。
并且光回收区域62为球冠状面或抛物面。入射区域61、发光单元64、出光区域63以及反射区域65位于球冠状面的球心位置或抛物面的焦点位置。
光回收区域62上设置有透光区域66，透光区域66设置在球冠状面或抛物面的中心位置，光回收区域62设置在球冠状面或抛物面的未设置透光区域66的位置。透光区域66可以为通孔或采用透光材料制成。
出光区域63位于球冠面或抛物面的凹面的一侧，出光区域63大角度的光被光回出光区域62反射，小角度的光从透光区域66出射。具体的光路图如图7所示。
本发明实施例还提供了一种显示装置，显示装置包括前文所的光源系统。其中，显示装置为微投、激光电视以及教育机等。
综上所述，本发明能够利用较低的成本达到高亮度的显示。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (11)

1. 一种光转换元件，其特征在于，所述光转换元件包括入射区域、发光单元、反射区域、出光区域和光回收区域，所述入射区域、所述发光单元、所述反射区域以及所述出光区域围合形成一空间结构，且所述反射区域围绕所述发光单元设置；其中：
所述入射区域用于入射激发光；
所述发光单元用于接收入射的激发光以产生受激光；
所述反射区域用于将至少部分所述受激光反射至所述出光区域以及将未被所述发光单元吸收的激发光反射至所述发光单元；
所述出光区域用于出射至少部分所述受激光；
所述光回收区域用于反射入射至所述光回收区域的激发光和/或受激光。
2. 根据权利要求1所述的光转换元件，其特征在于，所述入射区域上设置二向色元件，用于选择性地透射所述激发光，并反射所述受激光。
3. 根据权利要求1所述的光转换元件，其特征在于，所述出光区域的长宽比与投影屏幕的长宽比相匹配。
4.根据权利要求3所述的光转换元件，其特征在于，所述出光区域的长宽比为4：3或16：9。
5. 根据权利要求3所述的光转换元件，其特征在于，所述出光区域呈方形，所述出光区域和所述光回收区域位于同一平面且所述光回收区域与所述出光区域的边缘相连接。
6. 根据权利要求3所述的光转换元件，其特征在于，所述出光区域为球冠状面或抛物面，所述光回收区域沿着所述出光区域的周向设置；
其中，所述光转换元件还包括：
出光透镜，设置在所述出光区域的一侧，用于对从所述出光区域出射的受激光进行聚光。
7. 根据权利要求3所述的光转换元件，其特征在于，所述光回收区域为球冠状面或抛物面，所述光转换元件的入射区域、发光单元、反射区域及所述出光区域位于所述球冠状面的球心位置或所述抛物面的焦点位置；
所述光回收区域上设置有透光区域。
8. 根据权利要求1所述的光转换元件，其特征在于，所述发光单元采用纯相的荧光陶瓷或复合陶瓷材料。
9.一种光源系统，其特征在于，所述光源系统包括：
光源，用于发出激发光；
匀光元件，用于对所述激发光进行匀光；
光转换元件，用于接收匀光后的激发光并产生受激光，所述光转换元件为权利要求1-8任一项所述的光转换元件；
收集元件，用于接收所述光转换元件出射的受激光。
10. 根据权利要求9所述的光源系统，其特征在于，所述光源系统还包括：
散热件，用于对所述光源进行散热。
11. 一种显示装置，其特征在于，所述显示装置包括如权利要求9-10所述的光源系统。
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