WO2021258673A1 - 一种混合光源系统以及投影显示设备 - Google Patents

一种混合光源系统以及投影显示设备 Download PDF

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Publication number
WO2021258673A1
WO2021258673A1 PCT/CN2020/136291 CN2020136291W WO2021258673A1 WO 2021258673 A1 WO2021258673 A1 WO 2021258673A1 CN 2020136291 W CN2020136291 W CN 2020136291W WO 2021258673 A1 WO2021258673 A1 WO 2021258673A1
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Prior art keywords
light source
light
sub
group
source group
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PCT/CN2020/136291
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English (en)
French (fr)
Inventor
陈怡学
尹蕾
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成都极米科技股份有限公司
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Priority to JP2021558014A priority Critical patent/JP7229389B2/ja
Priority to EP20930651.3A priority patent/EP3958058A4/en
Priority to US17/603,941 priority patent/US20230116022A1/en
Publication of WO2021258673A1 publication Critical patent/WO2021258673A1/zh

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    • 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
    • G03B21/2013—Plural light sources
    • 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
    • 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
    • G03B21/208—Homogenising, shaping of the illumination light
    • 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
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/10—Simultaneous recording or projection
    • G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources

Definitions

  • the present invention relates to the technical field of hybrid light sources, in particular to a hybrid light source system and projection display equipment.
  • the projection display light source is a very important component, which is mainly used to mix different colors, different angle distributions, different brightness and different shapes of light and output them in parallel to form a uniform mixed color that illuminates the effective area of the display chip. Light spot.
  • dichroic mirrors, light combining elements, etc. can be used to transmit light within a certain wavelength range, while the reflection of other wavelengths achieves the combination of light of different colors, and finally obtains the light. Need to mix color beams.
  • the purpose of the present invention is to provide a hybrid light source system and a projection display device, which solves the problem of difficulty in mixing two light beams of the same color.
  • the present invention provides a hybrid light source system, including a first light source group, a second light source group and a band pass filter;
  • the light beams of the first light source group and the second light source group have the same color but different waveband ranges; the directions of the light beams emitted by the first light source group and the second light source group are perpendicular to each other;
  • the band-pass filter is arranged on the exit light path of the first light source group and the second light source group, and forms an angle of 45 degrees with the direction of the light beams emitted by the first light source group and the second light source group, and is used for The light beam of the first light source group is reflected, and the light beam of the second light source group is transmitted.
  • the first light source group includes at least a first sub-light source and a second sub-light source that emit light beams of different colors;
  • the second light source group includes sub-light sources with the same color as the second sub-light source; the wavelength range of the light beam emitted by the first sub-light source is within the wavelength range of the light beam emitted by the sub-light source.
  • a light combining element is further included, and the band-pass filter is arranged on the exit light path of the first sub-light source and the second light source group; the light combining element Arranged on the exit light path of the band pass filter and the second sub-light source;
  • the band pass filter is used to reflect the light beam of the first sub-light source and transmit the light beam of the sub-light source of the second light source group;
  • the light combining element is used to transmit the light beam of the first sub-light source and the light beam of the second light source group, and reflect the light beam of the second sub-light source.
  • the light combining element is any one of a dichroic mirror, a light combining sheet, or a band pass filter.
  • the first light source group further includes a third sub-light source, wherein the light beams of the first sub-light source, the second sub-light source, and the third sub-light source The colors are different, and the first sub-light source, the second sub-light source, and the third sub-light source are light sources of any one color among a red light source, a green light source, and a blue light source.
  • the second light source group includes multiple sub-light sources with more than two colors.
  • the first light source group and the second light source group are different types of light source groups; and the first light source group and the second light source group are lasers Either the light source group or the LED light source group.
  • the band pass filter is a grating band pass filter or a coated band pass filter.
  • it further includes a coupling lens group arranged on the exit light path of the band pass filter; and a shaping element arranged on the exit light path of the coupling lens group.
  • the application also provides a projection display device, including the hybrid light source system according to any one of the preceding claims.
  • a hybrid light source system provided by the present invention includes a first light source group, a second light source group, and a band-pass filter; the first light source group and the second light source group include the same emission color but different wavelength ranges; the first light source group The directions of the emitted light beams from the second light source group are perpendicular to each other; the band-pass filter is arranged on the exit light path of the first light source group and the second light source group, and the direction of the light emitted from the first light source group and the second light source group is 45 degrees The angle is used to reflect the light beam of the first light source group and transmit the light beam of the second light source group.
  • a band-pass filter with a narrower transition band bandwidth is used, so that two light beams with very close band ranges can also be combined to meet the same requirements.
  • the color beam needs to be supplemented with light to provide various mixed light sources required for illumination of the projection display device, and improve the display effect of the projection display device.
  • the application also provides a projection display device, which has the above-mentioned beneficial effects.
  • FIG. 1 is a schematic structural diagram of a hybrid light source system provided by an embodiment of the application
  • FIG. 2 is a schematic diagram of the transmittance of the band-pass filter provided by an embodiment of the application to the light beams of various wavelength bands;
  • FIG. 3 is a schematic diagram of the optical path structure of another hybrid light source provided by an embodiment of the application.
  • the core of this application is to provide a hybrid light source system, which can achieve beam combining with a relatively close range of wavelengths.
  • the more common light combining method is that two different light-emitting light sources are incident on two different surfaces of optical elements such as dichroic mirrors and light combining plates in a mutually perpendicular manner, and the light beam of one light source is transmitted, and the light beam of the other light source is transmitted.
  • the reflection of the light beam makes the light paths of the two light beams overlap, thereby realizing the combination of the two light beams.
  • this method of light combination is only applicable to two different color light beams. For light source components such as dichroic mirrors, It is difficult to achieve both transmission and reflection for the same color light beam.
  • this application provides a technical solution that can realize the combination of light beams of the same color.
  • Figure 1 is a schematic structural diagram of a hybrid light source system provided by an embodiment of this application
  • Figure 2 is a schematic diagram of the transmittance of a bandpass filter provided by an embodiment of this application to beams of various wavelength bands.
  • the light source system includes a first light source group 1, a second light source group 2 and a band pass filter 3;
  • the first light source group 1 and the second light source group 2 include light sources with the same color and different wavelength ranges; for example, the first light source group 1 and the second light source group 2 can both emit green light beams, but the first light source group 1 and the second light source group 2 can emit green light beams.
  • the wavelength bands of the green light beams emitted by the light source group 2 are different.
  • the directions of the first light source group 1 and the second light source group 2 emitting light beams are perpendicular to each other;
  • the band-pass filter 3 is arranged on the exit light path of the first light source group 1 and the second light source group 2, and forms a 45-degree angle with the direction of the first light source group 1 and the second light source group 2
  • the light beam of the light source group 1 is reflected, and the light beam of the second light source group 2 is transmitted.
  • various light sources that can generate light beams, there are many types of light sources, for example, laser light sources, LED light sources, and so on.
  • various light sources have their own advantages and disadvantages.
  • a laser light source it has the characteristics of high brightness, but there is also a problem of speckle when used as an illumination light source; while for an LED light source, there is a problem of insufficient brightness.
  • the output beam can eliminate speckle and ensure the brightness; of course, it does not send out the use of two LED light source beams to increase the brightness, or the mixed use of other types of light sources.
  • the hybrid light source system provided in this embodiment also realizes the combination of the light beams output by the two light sources.
  • the first light source group 1 and the second light source group 2 can be the same type of light source group, for example, the first light source group 1 and the second light source group 2 are both laser light source groups or LED light source groups;
  • the light source group 1 and the second light source group 2 are different types of light source groups.
  • the first light source group 1 and the second light source group 2 may be laser light source groups or LED light source groups, respectively, which is not specifically limited in this application.
  • the reason why the light beams of the two light source groups are combined is generally to make up for the shortcomings of the light beams emitted by a single light source, such as the defect of insufficient brightness and the defect of speckle.
  • the two The light beams emitted by the light source group need to be light beams of the same color.
  • the common method for combining two light beams is to use optical elements such as dichroic mirrors, filters, light combining plates, etc., so that the two light beams are perpendicular to each other and enter the two beams at an incident angle of 45 degrees.
  • the two different surfaces of optical elements such as a dichroic mirror make the dichroic mirror transmit light waves in the wavelength range of one of the beams, and reflect light waves in the wavelength range corresponding to the other beam, and finally make the two beams The beams merge and exit.
  • this method of combining light beams is often used to combine light beams of different colors. For light beams of the same color, optical elements such as dichroic mirrors cannot transmit and reflect light beams in the same wavelength range.
  • the transition bandwidth between transmissive and non-transmissive in different wavelength bands is very narrow, and it can transmit and reflect light from two different wavelength bands with similar wavelength ranges.
  • the band pass filter 3 can transmit the waveband range can be very narrow, which means that in the same color waveband range, the light corresponding to the two different wavebands can be reflected and transmitted separately.
  • the bandwidth of the transmittable and reflectable wavelength range is relatively larger than that of the bandpass filter 3, and the transition between reflectance and transmittance is relatively large.
  • the band bandwidth is also relatively large, which obviously cannot realize the functions that can be realized by the band-pass filter 3 in this application.
  • the wavelength band has a certain bandwidth. For example, for green light with a wavelength of 492nm to 577nm, then for light with a wavelength of 492nm to 530nm and light with a wavelength of 540nm to 577nm, All are green beams.
  • two different light source groups emit light beams of the same color and different wavelength bands from different directions, and the band-pass filter 3 is used to treat some of the light beams of the same color. It can be transmitted and reflected in other wavebands to achieve beam combining.
  • the wavelength range of the beam emitted from the first light source group 1 is 492 nm to 530 nm
  • the wavelength range of the beam emitted from the second light source group 3 is 540 nm to 577 nm.
  • the light beams emitted by the two light source groups are light beams of the same color, even if the wavelength bands of the light beams emitted by the two light source groups overlap with each other, it does not affect the realization of the technical solution of the present application.
  • the beam bandwidth of the laser light source group can generally be very narrow, while the beam bandwidth of the LED light source group is relatively wide.
  • the laser light source can output light beams with a wavelength range of 525nm to 530nm
  • the LED light source group can output light beams with a wavelength range of 492nm to 577nm
  • the bandpass filter 3 can reflect a wavelength range of 525nm to 530nm, and other wavelength ranges. All beams are transmitted. Although some wavelengths of light beams in the LED light source group are filtered, it does not affect the combination of light beams of the same color in the present application.
  • both the first light source group 1 and the second light source group 2 of this embodiment may have light sources of more than two colors.
  • a first sub-light source 11 and a second sub-light source 12 may be provided in the first light source group 1, and the colors of the light beams emitted by the first sub-light source 11 and the second sub-light source 12 are different.
  • the second light source group 2 it may only include light sources with the same color as the first sub-light source 11 but with a different wavelength range, or may include the same light beam as the first sub-light source 11 but with a different wavelength range, and the second light source group.
  • the sub-light source 12 has two light sources with the same beam color but different wavelength ranges; even, the second light source group 2 may also include two light sources with the same beam color as the first sub-light source 11 and the second sub-light source 12 but different wavelength ranges.
  • the light source it also includes a light source that is not used with the first sub-light source with the beam colors of 11 and the second sub-light source 12. As long as it can meet the requirements of the hybrid light source system in practical applications.
  • both the first light source group 1 and the second light source group 2 may only include light sources of one color, or may include light sources of multiple colors; and the first light source group 1 and the second light source group 2
  • the number of light sources of each color may be only one or more than one, which is not specifically limited in this application.
  • the bandpass filter used in this application can achieve relatively narrow transmission and reflection band bandwidth, and the transmission and reflection transition band bandwidth is also relatively narrow. This feature realizes two beams of colors.
  • the combination of the same light rays with different incident directions is beneficial to expand the effective application of the hybrid light source system, and the application of the hybrid light source in the projection display device is beneficial to improve the display effect of the projection display device.
  • FIG. 3 is a schematic diagram of the optical path structure of another hybrid light source provided by an embodiment of this application.
  • the hybrid light source system may include:
  • the first light source group 1 wherein the first light source group 1 may include a first sub-light source 11 and a second sub-light source 12 that emit light beams of different colors;
  • the second light source group 12 wherein the second light source group 12 may include a third sub-light source 21 and a fourth sub-light source 22 that emit light beams of different colors, and the light beam colors of the first sub-light source 11 and the second sub-light source 12 are the same, and The wavelength range is different, and the colors of the light beams emitted from the first sub-light source 11, the second sub-light source 12, and the fourth sub-light source 22 are all different.
  • the band-pass filter 3 can reflect light in the wavelength range corresponding to the light beam of the first sub-light source 11, and transmit light in other wavelength bands;
  • the light reflection in the wavelength range corresponding to the light beam of the two sub-light sources 12 transmits the light beams in other wavelength bands.
  • the light beams of the first sub-light source 11 and the light beams of the third sub-light source 21 and the fourth sub-light source 22 are perpendicular to each other and enter the band-pass filter 3, which is opposed to the first sub-light source 11
  • the light beam reflected by the third sub-light source 21 and the fourth sub-light source 23 is transmitted, so that the light beam direction of the first sub-light source 11 is deflected by 90 degrees and the light beams of the third sub-light source 21 and the fourth sub-light source 22
  • the direction is the same, and the light beams of the same color of the first sub-light source 11 and the third sub-light source 21 are combined; the light beams of the first sub-light source 11, the third sub-light source 21, and the fourth sub-light source 22 pass through the band-pass filter 3.
  • the beam directions of the second sub-light source 12 are perpendicular to each other, and both are incident on the light combining element 4, and then combined and output through the light combining element 4.
  • the band-pass filter 3 is used to combine the light, and the same beam of light of the same color is synthesized. It is sufficient that the light combining element 4 combines light.
  • optical elements such as dichroic mirrors, light combining plates, filters, etc. may be used.
  • this embodiment does not exclude that the light combining element 1 also uses a band pass filter.
  • the number of light sources included in the first light source group 1 and the second light source group 2 is not necessarily the same.
  • the fourth sub-light source 22 may also be arranged in the first light source group 1, and accordingly, the light combining element 4 needs to reflect the light beam of the fourth sub-light source 22.
  • the second sub-light source 12, the third sub-light source 21, and the fourth sub-light source 22 can all be arranged on the second light source group 2.
  • only one band-pass filter 3 is required. It suffices to reflect the light beam of the first sub-light source 11 and transmit light beams of other wavelength bands.
  • the combined output of light beams of multiple colors is set.
  • this embodiment will be described by taking a light source of a specific color as an example.
  • the first light source group 1 includes a first red light source and a green light source
  • the second light source group 2 includes a second red light source and a blue light source
  • the wavelength band of the first red light source is different from that of the second red light source.
  • the band-pass filter 3 reflects the light beam from the first red light source and transmits the second red light source; when a light combining element is provided in the mixed light source system, the light combining element reflects the light beam from the green light source and reflects the light beam from the first red light source, Both the second red light source and the blue light source are transmitted, and the light beams of the three colors of red, blue and green can be combined.
  • the light combining element 4 may not be provided in the mixed light source system, so that the band-pass filter 3 can reflect the light beam of the first red light source and the light beam of the green light source, and the light beam of the second red light source and the light beam of the blue light source can also be transmitted. Able to combine three colors of light beams.
  • the first light source group 1 only includes the first red light source
  • the second light source group 2 includes the second red light source, the green light source and the blue light source
  • the first light source group 1 includes the first red light source and the green light source.
  • the light source and the blue light source, and the second light source group 2 includes the second red light source can realize the technical solution in this application, and there is no specific limitation in this application.
  • the band-pass filter 3 used may specifically be a coated band-pass filter or a time grating band-pass filter, which is not specifically limited in this application.
  • both the first light source group 1 and the second light source group 2 may include multiple light sources of different colors, respectively emitting light beams of multiple different colors.
  • the A coupling lens group 4 is provided on the exit light path of the pass filter 3, and a shaping element 5 is provided on the exit light path of the coupling lens group 4, so as to uniformly shape the emitted light.
  • the coupling lens group 4 can also be arranged between the band pass filter 3 and the first light source group 1, and between the band pass filter 3 and the second light source group 2, respectively. There are no specific restrictions.
  • the hybrid light source system provided by the foregoing embodiment can be applied to many different occasions.
  • the hybrid light source system can be installed in the projection display device and used in conjunction with the chip containing the projection image, so that the light beam output by the hybrid light source system is incident on the surface of the chip and reflected into the waveguide element through the waveguide The element is incident into the human eye, so that when the projection display device projects the projection light beam carrying the projection image information to the human eye, it can ensure the effect of the display screen incident on the human eye.
  • the hybrid light source system in this application is not limited to being used in projection display devices, but can also be used similarly to automotive lighting.
  • the hybrid light source system of this embodiment the three primary color light beams of red, blue and green are combined to form a white light beam. , Provide lighting for cars.

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Abstract

一种混合光源系统和投影显示设备，其中混合光源系统包括第一光源组(1)、第二光源组(2)和带通滤波器(3)；第一光源组(1)和第二光源组(2)发出颜色相同而波段范围不同的光束；第一光源组(1)和第二光源组(2)发射光束的方向相互垂直；带通滤波器(3)设置在第一光源组(1)和第二光源组(2)的出射光路上，且和第一光源组(1)和第二光源组(2)出射光束的方向呈45度角，用于对第一光源组(1)的光束反射，对第二光源组(2)的光束透射。采用过渡波段带宽更窄的带通滤波器(3)，使得两束波段范围非常接近的光束合并，满足同种颜色光束需要补光的需求，为投影显示设备提供照明所需的各种混合光源，提升投影显示设备的显示效果。

Description

一种混合光源系统以及投影显示设备 技术领域
本发明涉及混合光源技术领域，特别是涉及一种混合光源系统以及投影显示设备。
背景技术
在投影显示产品中，投影显示光源是非常重要的部件，主要用于将不同颜色、不同角度分布、不同亮度和不同形状的光线混合后平行输出，形成照射到显示芯片有效区域的混合颜色的均匀光斑。
目前，在混合光源的光路结构中，主要是利用二向色镜、合光元件等可对某一波段范围内的光线透射，而其他波段的光线反射实现不同颜色光线的合光，最终获得所需混合颜色的光束。
发明内容
本发明的目的是提供一种混合光源系统以及投影显示设备，解决了同种颜色的两束光束混合难度大的问题。
为解决上述技术问题，本发明提供一种混合光源系统，包括第一光源组、第二光源组和带通滤波器；
所述第一光源组的光束和所述第二光源组的光束颜色相同而波段范围不同；所述第一光源组和所述第二光源组发射光束的方向相互垂直；
所述带通滤波器设置在所述第一光源组和第二光源组的出射光路上，且和所述第一光源组和所述第二光源组出射光束的方向呈45度角，用于对所述第一光源组的光束反射，对所述第二光源组的光束透射。
在本申请的一种可选地实施例中，所述第一光源组中包含至少发出不同颜色光束的第一子光源和第二子光源；
其中，所述第二光源组中包括和所述第二子光源光束颜色相同的子光源；所述第一子光源发出的光束波段范围在所述子光源发出的光束波段范围内。
在本申请的一种可选地实施例中，还包括合光元件，所述带通滤波器设置在所述第一子光源和所述第二光源组的出射光路上；所述合光元件设置在所述带通滤波器和所述第二子光源的出射光路上；
所述带通滤波器用于对所述第一子光源的光束反射，对所述第二光源组的子光源的光束透射；
所述合光元件用于对所述第一子光源的光束和所述第二光源组的光束透射，对所述第二子光源的光束反射。
在本申请的一种可选地实施例中，所述合光元件为二向色镜、合光片或带通滤波器中的任意一种光学元件。
在本申请的一种可选地实施例中，所述第一光源组还包括第三子光源，其中，所述第一子光源、所述第二子光源以及所述第三子光源的光束颜色各不相同，且所述第一子光源、所述第二子光源以及所述第三子光源的为红色光源、绿色光源、蓝色光源中的任意一种颜色的光源。
在本申请的一种可选地实施例中，所述第二光源组中包括两种颜色以上的多个子光源。
在本申请的一种可选地实施例中，所述第一光源组和所述第二光源组中为不同类型的光源组；且所述第一光源组和所述第二光源组为激光光源组或LED光源组中的任意一种。
在本申请的一种可选地实施例中，所述带通滤波器为光栅带通滤波器或镀膜带通滤波器。
在本申请的一种可选地实施例中，还包括设置在所述带通滤波器的出射光路上的耦合透镜组；以及设置在所述耦合透镜组的出射光路上的整形元件。
本申请还提供了一种投影显示设备，包括如权上任一项所述的混合光源系统。
本发明所提供的一种混合光源系统，包括第一光源组、第二光源组和带通滤波器；第一光源组和第二光源组包含有发出颜色相同而波段范围不同；第一光源组和第二光源组发射光束的方向相互垂直；带 通滤波器设置在第一光源组和第二光源组的出射光路上，且和第一光源组和第二光源组出射光束的方向呈45度角，用于对第一光源组的光束反射，对第二光源组的光束透射。
本申请中在对两组不同的光源组中的光束进行合光时，采用的是过渡波段带宽更窄的带通滤波器，使得两束波段范围非常接近的光束也能够实现合并，满足同种颜色光束需要补光的需求，为投影显示设备提供照明所需的各种混合光源，提升投影显示设备的显示效果。
本申请还提供了一种投影显示设备，具有上述有益效果。
附图说明
为了更清楚的说明本发明实施例或现有技术的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单的介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的混和光源系统的结构示意图；
图2为本申请实施例提供的带通滤波器对各个波段光束的透射率的示意图；
图3为本申请实施例提供的另一混合光源的光路结构示意图。
具体实施方式
本申请的核心是提供一种混合光源系统，能够实现波段范围较为接近的光束合并。
为了使本技术领域的人员更好地理解本发明方案，下面结合附图和具体实施方式对本发明作进一步的详细说明。显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
目前比较常见的合光方式是两个不同的发光光源以相互垂直的方式入射至二向色镜、合光片等光学元件两个不同的表面，对其中一个光源的光束透射，对另一光源的光束反射，使得两束光线的光路重 合，进而实现两束光束的合光，但是这种合光的方式仅仅只适用于两种不同颜色的光束，对于二向色镜等光源元件而言，难以实现对同一颜色的光束既透射有反射。
为此，本申请中提供了一种能够实现同种颜色的光束合光的技术方案。
如图1和图2所示，图1为本申请实施例提供的混和光源系统的结构示意图，图2为本申请实施例提供的带通滤波器对各个波段光束的透射率的示意图，该混合光源系统，包括第一光源组1、第二光源组2和带通滤波器3；
第一光源组1和第二光源组2包含有发出颜色相同而波段范围不同的光源；例如第一光源组1和第二光源组2均可以发出绿色光束，但第一光源组1和第二光源组2发出的绿色光束的波段不同。
并且，第一光源组1和第二光源组2发射光束的方向相互垂直；
带通滤波器3设置在第一光源组1和第二光源组2的出射光路上，且和第一光源组1和第二光源组2出射光束的方向呈45度角，用于对第一光源组1的光束反射，对第二光源组2的光束透射。
在目前可产生光束的各类光源中，光源的种类繁多，例如，激光光源，LED光源等等。但是各种不同光源各有其优缺点。例如，对于激光光源而言，具有亮度高的特点，但是也存在作为照明光源使用时，易出现散斑的问题；而对于LED光源而言，存在亮度不足的问题。
因此，在实际应用过程中，为了弥补各种不同光源的各自的缺点，在实际应用过程中，就需要用到多个光源混合使用，例如将激光光源发出的光束和LED光源发出的光束进行混合，使得输出的光束既能够消除散斑，有能够保证亮度；当然，也并不派出采用两个LED光源光束混合提高亮度，或者是其他种类的光源混合使用。
本实施例中所提供的混合光源系统也即是实现两个光源输出的光束的合并。基于上述论述显然，对于第一光源组1和第二光源组2可以是同一种类型的光源组，例如第一光源组1和第二光源组2均是激光光源组或者LED光源组；第一光源组1和第二光源组2分别为不 同类型的光源组，第一光源组1和第二光源组2可以分别是激光光源组或者LED光源组，对此本申请中不做具体限制。
进一步地，如前所述，之所以将两个光源组的光束进行合并，一般是为了弥补单一光源发出的光束的缺点，例如，亮度不足的缺陷、散斑的缺陷，这种情况下两个光源组发出的光束就需要是同种颜色的光束。
而现有技术中，对两束光束进行合光，常用的方式是利用二向色镜、滤光片、合光片等光学元件，使得两束光束相互垂直并分别以45度入射角入射二向色镜等光学元件的两个不同的表面，使得二向色镜对其中一种光束的波段范围内的光波进行透射，而对另一光束对应的波段范围的光波进行反射，最终使得两束光束合并出射。但是这一合并光束的方式常用于不同颜色的光束的合并，对于同样颜色的光束，二向色镜等光学元件无法实现对同一波段范围内的光束既透射又反射。
如图2所示，对于带通滤波器3而言，其对不同波段的可透射和不可透射之间的过渡带宽非常窄，能够实现对波段范围相近的两个不同波段光线分别进行透射和反射；并且带通滤波器3可以透射的波段范围可以非常窄，这也就为在同一颜色的波段范围内，实现对两种不同波段对应的光线分别进行反射合透射。
普通的二向色镜及其类似的光学元件而言，其可透射和可反射的波段范围的带宽相对于带通滤波器3而言相对较大，且其可反射和可透射之间的过渡波段带宽也相对较大，显然无法实现本申请中带同滤波器3可实现的功能。
进一步地，对于同一种颜色的光束而言，其波段是具有一定的带宽的，例如，对于绿光波长为492nm～577nm，那么对波长为492nm至530nm的光线和波长为540nm至577nm的光线就均为绿色光束。
由此，本申请中为了实现两种相同颜色的光束，通过两个不同的光源组分出从不同方向发出同种颜色的不同波段的光束，并利用带通滤波器3对其中部分波段的光束可以透射而其他波段反射，实现光束 合并。
例如，第一光源组1中出射的光束波段为492nm至530nm，第二光源组3中出射的光束波段为540nm至577nm。
当然，因为两种光源组发出的光束是同种颜色的光束，即便两个光源组出射的光束波段存在相互重合，也并不影响本申请的技术方案的实现。
例如，激光光源组的光束带宽一般可以做到非常窄，而LED光源组的光束带宽则相对较宽。为此，激光光源可以输出波段范围为525nm至530nm的光束，而LED光源组可输出波段范围为492nm至577nm的光束，而带通滤波器3可反射的波段范围为525nm至530nm，其他波段范围的光束则全部透射。尽管LED光源组中存在部分波段的光束被过滤，但是也并不影响本申请同种颜色的光束的合并。
当然，在实际应用过程中混合光源系统的光束的颜色种类并不是单一的。为此，在本实施例的第一光源组1和第二光源组2中均可以存在两种颜色以上的光源。
例如，可以在第一光源组1中设置第一子光源11和第二子光源12，并且第一子光源11和第二子光源12发出的光束的颜色不同。而对于第二光源组2，可以仅仅只包含和第一子光源11的光束颜色相同而波段范围不同的光源，也可以包含和第一子光源11的光束颜色相同而波段范围不同以及和第二子光源12的光束颜色相同而波段范围不同的两种光源；甚至，第二光源组2还可以在包含和第一子光源11以及第二子光源12的光束颜色相同而波段范围不同的两种光源的基础上，还包括和第一子光源以11及第二子光源12的光束颜色不用的光源。只要能够满足混合光源系统在实际应用中的需求即可。
需要说明的是，对于第一光源组1和第二光源组2中的均可以只包含一种颜色的光源、也可以包括多种颜色的光源；并且第一光源组1和第二光源组2中每种颜色的光源的数量可以仅仅只有一个也可以包含多个，对此本申请中不做具体限制。
综上所示，本申请中利用带通滤波器可透射和可反射的波段带宽 可做到相对较窄，且透射和反射过渡的波段带宽也相对较窄的这一特性，实现了两束颜色相同，而入射方向不同的光线的合并，有利于扩展混合光源系统的有效应用，且将该混合光源应用于投影显示设备中，有利于提高投影显示设备的显示效果。
基于上述实施例，在本申请的一种可选地实施例中，参考图3，图3为本申请实施例提供的另一混合光源的光路结构示意图，该混合光源系统可以包括：
第一光源组1，其中，第一光源组1可以包括发出不同颜色光束的第一子光源11和第二子光源12；
第二光源组12，其中，第二光源组12可以包括发出不同颜色光束的第三子光源21和第四子光源22，并且第一子光源11和第二子光源12的光束颜色相同，而波段范围不同，第一子光源11、第二子光源12、第四子光源22中发出的光束的颜色均不相同。
还包括带通滤波器3和合光元件4，其中，带通滤波器3可以对第一子光源11的光束对应的波段范围的光线反射，而对其他波段的光束透射；合光元件4对第二子光源12的光束对应的波段范围内的光线反射对其他波段的光束透射。
如图3所示，第一子光源11的光束与第三子光源21以及第四子光源22的光束相互垂直的入射至带通滤波器3，该带通滤波器3对第一子光源11的光束反射，而对第三子光源21、第四子光源23的光束透射，使得第一子光源11的光束方向进行90度的偏转而和第三子光源21以及第四子光源22光束的方向相同，进而实现第一子光源11和第三子光源21的同种颜色的光束的合并；第一子光源11、第三子光源21、第四子光源22的光束经过带通滤波器3合并后，和第二子光源12的光束方向相互垂直并均入射至合光元件4，经过合光元件4合并输出。
对于第一子光源11和第二子光源12发出的同种颜色不同波段的光束，采用带通滤波器3进行合光，合成同一束同种颜色的光线后， 在对不同颜色的光束采用普通的合光元件4合光即可，例如可以采用二向色镜、合光片、滤光片等等光学元件。当然，本实施例中也并不排除该合光元件1同时也采用带通滤波器。
另外，对于第一光源组1和第二光源组2中包含的光源数量并不一定相同。例如，在本实施例中，第四子光源22也可以设置在第一光源组1中，相应地，合光元件4就需要对第四子光源22的光束进行反射。
同理，在实际应用过程中，也可以将第二子光源12、第三子光源21以及第四子光源22均设置在第二光源组2上，此时仅仅需要设置一个带通滤波器3对第一子光源11的光束反射，而对其他波段的光束进行透射即可。
本实施例是基于混合光源系统在实际应用中，对光束颜色的多样化需求，而设定多种颜色的光束合并输出。下面以具体颜色的光源对本实施例进行举例说明。
本实施例中第一光源组1包括第一红色光源、绿色光源；第二光源组2包括第二红色光源和蓝色光源；该第一红色光源的波段和第二红色光源的波段不同。
带通滤波器3对第一红色光源的光束反射、对第二红色光源透射；当混合光源系统中设置有合光元件，则该合光元件对绿色光源的光束反射，对第一红色光源、第二红色光源以及蓝色光源均透射，即可实现红蓝绿三种颜色的光束合并。
当然混合光源系统中也可以不设置合光元件4，使得带通滤波器3可对第一红色光源的光束和绿色光源的光束反射，而第二红色光源的光束以及蓝色光源的光束透射也能够实现三种颜色的光束合并。
显然，当第一光源组1中仅仅只包括第一红色光源，而第二光源组2包括第二红色光源，绿色光源和蓝色光源；或者第一光源组1中包括第一红色光源、绿色光源以及蓝色光源，第二光源组2中包括第二红色光源，均可以实现本申请中的技术方案，对此，本申请中不做具体限制。
对于上述实施例中任意一种混合光源系统中，所采用的带通滤波器3具体可以是镀膜带通滤波器或者时光栅带通滤波器，对此本申请中不做具体限制。
可选地，如上所述，第一光源组1和第二光源组2中均可能包含多种不同颜色的光源，分别发出多种不同颜色的光束，为了减小光束的发散性，可以在带通滤波器3的出射光路上设置耦合透镜组4，并在耦合透镜组4的出射光路上设置整形元件5，以便对出射的光线进行匀光整形。
可选地，该耦合透镜组4也可以分别设置在带通滤波器3和第一光源组1之间，以及设置在带通滤波器3和第二光源组2之间，对此本申请中不做具体限制。
对于上述实施例提供的混合光源系统，可以应用于多种不同的场合。以投影显示设备为例，该混合光源系统可以设置在投影显示设备中，和包含有投影图像的芯片配合使用，使得该混合光源系统输出的光束入射至芯片表面并反射至波导元件中，通过波导元件入射至人眼中，满足投影显示设备向人眼投射携带有投影图像信息的投影光束时，能够保证入射人眼的显示画面的效果。
当然，本申请中的混合光源系统也并不仅限于用于投影显示设备，还可用于类似于汽车照明车灯，本实施例的混合光源系统中将红蓝绿三种基色光束进行合并形成白色光束，为汽车提供照明。该混合光源系统还存在其他应用，对此本申请中不再一一列举。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定 的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。另外，本申请实施例提供的上述技术方案中与现有技术中对应技术方案实现原理一致的部分并未详细说明，以免过多赘述。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其它实施例的不同之处，各个实施例之间相同或相似部分互相参见即可。本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以对本发明进行若干改进和修饰，这些改进和修饰也落入本发明权利要求的保护范围内。

Claims (10)

  1. 一种混合光源系统，其特征在于，包括第一光源组、第二光源组和带通滤波器；
    所述第一光源组的光束和所述第二光源组的光束颜色相同而波段范围不同；所述第一光源组和所述第二光源组发射光束的方向相互垂直；
    所述带通滤波器设置在所述第一光源组和第二光源组的出射光路上，且和所述第一光源组和所述第二光源组出射光束的方向呈45度角，用于对所述第一光源组的光束反射，对所述第二光源组的光束透射。
  2. 如权利要求1所述的混合光源系统，其特征在于，所述第一光源组中包含至少发出不同颜色光束的第一子光源和第二子光源；
    其中，所述第二光源组中包括和所述第二子光源光束颜色相同的子光源；所述第一子光源发出的光束波段范围在所述子光源发出的光束波段范围内，且所述第一子光源发出的光束波段范围小于所述第二光源组中所述子光源的波段范围。
  3. 如权利要求2所述的混合光源系统，其特征在于，还包括合光元件，所述带通滤波器设置在所述第一子光源和所述第二光源组的出射光路上；所述合光元件设置在所述带通滤波器和所述第二子光源的出射光路上；
    所述带通滤波器用于对所述第一子光源的光束反射，对所述第二光源组的子光源的光束透射；
    所述合光元件用于对所述第一子光源的光束和所述第二光源组的光束透射，对所述第二子光源的光束反射。
  4. 如权利要求3所述的混合光源系统，其特征在于，所述合光元件为二向色镜、合光片或带通滤波器中的任意一种光学元件。
  5. 如权利要求2所述的混合光源系统，其特征在于，所述第一光源组还包括第三子光源，其中，所述第一子光源、所述第二子光源以及所述第三子光源的光束颜色各不相同，且所述第一子光源、所述第二子光源以及所述第三子光源的为红色光源、绿色光源、蓝色光源中 的任意一种颜色的光源。
  6. 如权利要求2所述的混合光源系统，其特征在于，所述第二光源组中包括两种颜色以上的多个子光源。
  7. 如权利要求1所述的混合光源系统，其特征在于，所述第一光源组和所述第二光源组为不同类型的光源组；且所述第一光源组和所述第二光源组为激光光源组或LED光源组中的任意一种。
  8. 如权利要求1至7任一项所述的混合光源系统，其特征在于，所述带通滤波器为光栅带通滤波器或镀膜带通滤波器。
  9. 如权利要求7所述的混合光源系统，其特征在于，还包括设置在所述带通滤波器的出射光路上的耦合透镜组；以及设置在所述耦合透镜组的出射光路上的整形元件。
  10. 一种投影显示设备，其特征在于，包括如权利要求1至9任一项所述的混合光源系统。
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