WO2020220701A1 - 光源系统及显示设备 - Google Patents

光源系统及显示设备 Download PDF

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Publication number
WO2020220701A1
WO2020220701A1 PCT/CN2019/127264 CN2019127264W WO2020220701A1 WO 2020220701 A1 WO2020220701 A1 WO 2020220701A1 CN 2019127264 W CN2019127264 W CN 2019127264W WO 2020220701 A1 WO2020220701 A1 WO 2020220701A1
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WO
WIPO (PCT)
Prior art keywords
light
light source
source system
luminous body
micro
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/127264
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English (en)
French (fr)
Inventor
吴超
余新
胡飞
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Publication date
Application filed by Appotronics Corp Ltd filed Critical Appotronics Corp Ltd
Publication of WO2020220701A1 publication Critical patent/WO2020220701A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • G03B21/206—Control of light source other than position or intensity
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]

Definitions

  • the present invention relates to the field of display technology, in particular to a light source system and a display device.
  • a light source array is usually used as the light source of the projection device.
  • Each light source is responsible for the illumination of an area.
  • the luminous intensity of the light source is dynamically controlled according to the peak brightness of each area of the screen to achieve high-contrast display.
  • the gray value of the image in the middle area is usually higher, and the gray value of the image in the surrounding area is lower, so that the brightness of the light source responsible for the middle area illumination is higher, and the brightness of the light source responsible for the surrounding area illumination is lower. Low, after a period of time, the brightness of the light source in the middle zone attenuates greatly.
  • the entire light source array When its brightness attenuates to 80% of the original, the entire light source array needs to be replaced, and the overall life of the light source array is not fully utilized. After one or several light sources have problems, dark areas will appear on the projection screen, and the entire projection system needs to stop projection for light source maintenance.
  • the center wavelengths of the lasers in different sections of the blue laser array differ by 3nm, the chromatic aberration of the blue field will be noticed by ordinary viewers. If the aging degree of the intermediate light source is inconsistent with the surrounding light source, it is easy to cause the color difference that the human eye can perceive.
  • the first aspect of the present invention provides a light source system, including:
  • the array light source includes X first luminous bodies with independently adjustable brightness and Y second luminous bodies with independently adjustable brightness. Each first luminous body is used to emit one or more first lights. When the maximum luminous power of a luminous body is less than or equal to the preset attenuation threshold, at least one of the second luminous bodies replaces the first luminous body whose maximum luminous power is less than the preset attenuation threshold to emit first light; and
  • the light path switching device is used to adjust the propagation direction of the first light, so that the first light becomes the second light after the light path is adjusted and is guided to the preset illumination area.
  • a second aspect of the present invention provides a display device including the above-mentioned light source system.
  • the light source system and the display device provided by the embodiments of the present invention add a second luminous body for redundant backup to ensure that after one or several of the first luminous bodies fail or deteriorate, the second luminous body can replace the failure Or the aging first luminous body emits the first light to maintain the normal operation of the entire array light source, which is beneficial to increase the life of the array light source and reduce the color difference caused by the inconsistent light emission after the aging of the first luminous body.
  • FIG. 1 is a schematic structural diagram of a display device provided by an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of the light path mapping relationship between the light entrance and the light exit of the light path switching device provided by the embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an optical path switching device provided by an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of the optical path switching device provided by the embodiment of the present invention in another modified embodiment.
  • Display screen 10 Light source system 100 Array light source 110 First luminous body 111 Second luminous body 112
  • Light path switching device 120 Light entrance 121a Light exit 121b First reflecting element 122 First micro mirror 122a Second reflective element 124 Second micro mirror 124a First rotating polyhedron 126 First mirror 126a Second rotating polyhedron 128 Second mirror 128a Wavelength conversion device 140 Control device 160 Light modulation device 600 Lens device 700
  • FIG. 1 is a schematic structural diagram of a display device 10 according to a preferred embodiment of the present invention.
  • the display device 10 may be one of a cinema projector, a laser TV, a business and education projector, and a micro projector.
  • a projection device is taken as an example for description. It can be understood that the display device 10 may also be the other devices mentioned above.
  • the display device 10 includes a light source system 100, a light modulation device 600, and a lens device 700.
  • the light source system 100 provided in the embodiment of the present invention is used to emit pre-modulated third light
  • the light modulation device 600 is used to perform secondary modulation on the third light emitted by the light source system 100 to obtain image light, and the image light comes from the lens device 700 Exit to form a display image.
  • the light source system 100 includes an array light source 110, an optical path switching device 120, a wavelength conversion device 140, and a control device 160.
  • the array light source 110, the optical path switching device 120 and the light modulation device 600 are electrically connected to the control device 160, respectively.
  • the array light source 110 includes X first luminous bodies 111 with independently adjustable brightness and Y second luminous bodies 112 with independently adjustable brightness. Both the first luminous body 111 and the second luminous body 112 are used to emit the first light. .
  • the light path switching device 120 is used to adjust the propagation direction of the first light emitted by the array light source 110, so that each first light becomes a second light after the light path is adjusted, and is respectively guided to a sub-area of the preset illumination area.
  • the predetermined illumination area is set on the wavelength conversion device 140, and the wavelength conversion device 140 is used for wavelength conversion of the second light emitted by the optical path switching device 120 to obtain the third light.
  • the control device 160 is used to control the light path switching device 120 to respectively guide the first light emitted by the array light source 110 to a sub-region in the preset illumination area that is different from the previous one or more image frames of the current image frame at a preset frame rate .
  • the array light source 110 is a laser light source, and in other embodiments, the array light source 110 may also be a laser phosphor light source, a bulb light source, a light emitting diode light source, and the like.
  • the array light source 110 is a blue light source and emits blue first light. It can be understood that the array light source 110 is not limited to a blue light source, and the array light source 110 may also be a purple light source, an orange light source, a yellow light source, a red light source, or a green light source.
  • the first luminous body 111 and the second luminous body 112 are both blue lasers, which are used to emit blue laser light as the first light.
  • Each first light-emitting body 111 and each second light-emitting body 112 may emit one or more first lights. Since the display screen is generally rectangular, the X first luminous bodies 111 are arranged in an m*n matrix. It is understood that the X first luminous bodies 111 may also be arranged in an array of other shapes.
  • the second luminous body 112 is used for when the maximum luminous power of at least one first luminous body 111 is less than or equal to the preset attenuation threshold, at least one of the second luminous bodies replaces the first luminous body whose maximum luminous power is less than the preset attenuation threshold to emit First light.
  • control device 160 may determine the first luminous body 111 whose maximum luminous power is less than the preset attenuation threshold and cut off the driving current of the corresponding first luminous body 111. It can be understood that the specific number of the first luminous body 111 and the second luminous body 112 in the array light source 110 can be selected according to actual needs.
  • the second luminous body 112 in the array light source 110 for redundant backup, it is ensured that after one or more of the first luminous bodies 111 fail or age, the second luminous body 112 can replace the fault. Or the aged first luminous body 111 can maintain the normal operation of the entire array light source 110, which is beneficial to improve the overall life of the array light source 110 and reduce the color difference caused by the inconsistent light emission after the first luminous body 111 is aged. In addition, after one or more of the first luminous bodies 111 fails, since the second luminous body 112 is used as a redundant backup, there will be no obvious dark areas in the projection screen, and there is no need to stop the entire projection system immediately for light source maintenance. .
  • the surface of the wavelength conversion device 140 includes a preset illumination area for receiving the second light emitted by the light path switching device 120.
  • the preset illumination area includes Z sub-areas, and the Z sub-areas are arranged in an array.
  • the first luminous body 111 The number X of the sub-areas is greater than or equal to the number Z of the sub-regions, so that during a plurality of consecutive image frames, different first luminous bodies 111 can be in turn responsible for the illumination of one sub-region and each first luminous body 111 can be in turn responsible for different sub-regions. Area lighting. In other embodiments, the number X of the first luminous bodies 111 may be less than the number Z of the sub-regions.
  • the surface of the wavelength conversion device 140 is also provided with a conversion area for wavelength conversion of the second light.
  • the preset illumination area is located in the conversion area on the second light path, and the conversion area is always located in the light of the second light.
  • the conversion area on the surface of the wavelength conversion device 140 is provided with a wavelength conversion material. Under the excitation of the second light, the wavelength conversion material performs wavelength conversion of the second light to obtain the third light.
  • the wavelength conversion device 140 is a fixed fluorescent sheet, and the position of the predetermined illumination area on the fluorescent sheet is fixed.
  • the surface of the fluorescent sheet is provided with yellow fluorescent powder or a combination of yellow fluorescent powder and blue fluorescent powder, or other wavelength conversion materials.
  • the wavelength conversion device 140 is a color wheel assembly. Since the relative position of the spot formed by the second light on the surface of the color wheel assembly with respect to a fixed point on the color wheel assembly is constantly changing, the predetermined It is assumed that the position of the illuminated area on the surface of the color wheel changes with the periodic movement of the color wheel assembly.
  • the surface of the color wheel assembly is provided with a wavelength conversion material, and the color wheel assembly periodically moves under the drive of its driving unit.
  • the color wheel assembly is provided with a filter unit, and the third light emitted by the wavelength conversion material is filtered by the filter unit. The light comes out.
  • the color wheel component can be a reflective color wheel or a transmissive color wheel.
  • the control device 160 is also used to calculate the peak brightness of each sub-region according to the image data of each frame of the image to be displayed to control the luminous power of the luminous body corresponding to each sub-region in the current image frame, which can improve the utilization rate of the light source.
  • the light path switching device 120 includes a plurality of light inlets 121a and a plurality of light outlets 121b, and the control device 160 controls the first light incident from one light inlet 121a at a preset frame rate.
  • the light is emitted from the light outlet 121b which is different from the previous one or more image frames of the current image frame as the second light, so that the first light incident from different light inlets during consecutive multiple image frames can be sequentially from different light outlets Shoot out.
  • the preset frame rate has a frequency unit, and the product of the preset frame rate and each image frame period is 1. In other embodiments, the product of the preset frame rate and multiple image frame periods may also be 1.
  • the number of the light entrances 121a is greater than or equal to the number of the light exits 121b. In other embodiments, the number of the light entrance 121a may be less than the number of the light exit 121b.
  • each image frame period includes Z preset time periods.
  • the control device 160 controls each first luminous body 111 (or each replacement) through the light path switching device 120 in each preset time period.
  • the first light emitted by the first luminous body 111 emits the first light and the second luminous body 112) emits the first light to a sub-area different from the previous one or more image frames of the current image frame.
  • the second light-emitting body 112 emits a beam of first light as an example for description, and each beam of first light is incident on a light entrance 121a of the light path switching device 120 respectively.
  • the array light source 110 includes Z first luminous bodies 111 (or including second luminous bodies 112 that partially replace the first luminous body 111 to emit the first light) numbered from 0 to (Z-1).
  • the illumination area includes Z sub-areas numbered from 0 to (Z-1), and each beam of first light is responsible for the illumination of one sub-area.
  • the control device 160 controls the light path switching device 120 to guide the first light emitted by the i-th first luminous body 111 or the second luminous body 112 to the i-th sub-region, where 0 ⁇ i ⁇ (Z-1);
  • the control device 160 controls the light path switching device 120 to emit the ith first luminous body 111 or the second luminous body 112 A light is guided to the (i+k) mod N sub-regions, where 0 ⁇ k ⁇ Z.
  • the sub-region corresponding to each first luminous body 111 or second luminous body 112 is +k is related to the remainder of N.
  • each frame of the image to be displayed includes a plurality of pixel units, one of the first luminous body or the second luminous body in the array light source is responsible for the illumination of one or more pixel units, and the image to be displayed is in Each pixel unit in the middle area is illuminated by a different first luminous body or second luminous body in each frame of image.
  • each pixel unit in the middle area of the image to be displayed is illuminated by a different first luminous body or a second luminous body in each frame of the image. This is beneficial to avoid the phenomenon that the first luminous body 111 responsible for the high-brightness sub-region is in a high-brightness state for a long time, and the brightness attenuation is large.
  • Each first luminous body 111 or second luminous body 112 is responsible for the illumination of each sub-zone in turn, which is beneficial to the brightness decay speed (aging) of each first luminous body 111 or second luminous body 112 in the entire array light source 110 Maintaining the relative consistency reduces the probability of display dead pixels due to damage to one or more of the first luminous bodies 111.
  • the middle area of the image in the embodiment of the present invention refers to an area where the image to be displayed is scaled to 40%-80% of the area with the center of the display area as the origin.
  • the light path switching device 120 includes a first reflective element 122 and a second reflective element 124 arranged in parallel to each other, wherein the first reflective element 122 forms an angle of 45 degrees with the incident first light.
  • the first reflective element 122 and the second reflective element 124 respectively include a plurality of first micro-mirrors 122a and a plurality of second micro-mirrors 124a arranged in an array.
  • the first of the first reflective elements 122 The number of micro mirrors 122 a is greater than or equal to the number of second micro mirrors 124 a in the second reflective element 124.
  • the number of the first micro-mirrors 122a may be less than the number of the second micro-mirrors 124a.
  • the control device 160 controls the deflection of the first micro-mirror 122a and the second micro-mirror 124a to change the angle of incidence of the first light with the first micro-mirror 122a and the second micro-mirror 124a, respectively, so that each first The first light emitted by the luminous body 111 or the second luminous body 112 is respectively guided to a sub-area different from the previous one or more image frames of the current image frame in the preset illumination area.
  • each first light emitted by each of the first luminous body 111 or the second luminous body 112 is sequentially reflected by at least one first micro-mirror 122a and at least one second micro-mirror 124a, and then exits as The second light.
  • each first light-emitting body 111 and each second light-emitting body 112 are blue lasers. Since the first light emitted by each laser is parallel light with a narrow beam diameter, the first light passes through the first light.
  • the beam diameter and the beam divergence angle remain unchanged, thereby ensuring that each second light emitted by the optical path switching device 120 irradiates a sub-area of the preset illumination area.
  • the first micro-mirror 122a and the second micro-mirror 124a are both biaxial controllable mirrors, that is, the first micro-mirror 122a and the second micro-mirror 124a can move in the first direction and the second direction. Lifting, rotating or moving in two directions, where the first direction and the second direction are perpendicular to each other, so that the optical path switching device 120 can adjust the optical path of each incident first light so that each emitted second light can irradiate In different sub-regions.
  • the first micro mirror 122a and the second micro mirror 124a are both three-axis controllable mirrors, that is, the first micro mirror 122a and the second micro mirror 124a can move up and down in a three-dimensional space. , Rotate or move.
  • the control device 160 controls the deflection direction of each first micro-mirror 122a and each second micro-mirror 124a according to the image data of the image to be displayed.
  • the jth The light emitted by a micro-mirror 122a illuminates the j-th second micro-mirror 124a; during the current image frame, the light emitted by the j-th first micro-mirror 122a illuminates the j+1-th second micro-mirror 124a...and so on.
  • the optical path switching device 120 includes a first rotating polyhedron 126 and a second rotating polyhedron 128, wherein a plurality of arrays are arranged on one or more sides of the first rotating polyhedron 126 A plurality of second mirrors 128a are arrayed on one or more sides of the first reflecting mirror 126a and the second rotating polyhedron 128.
  • the first rotating polyhedron 126 and the second rotating polyhedron 128 each have six sides. Each side of the first rotating polyhedron 126 has a plurality of first reflecting mirrors 126a distributed in an array.
  • a plurality of second mirrors 128a are arranged in an array on each side surface, and the first rotating polyhedron 126 and the second rotating polyhedron 128 rotate in opposite directions around the geometric center axis perpendicular to the two bottom surfaces except the side surfaces (first The rotating polyhedron 126 rotates in a clockwise direction, the second rotating polyhedron 128 rotates in a counterclockwise direction, or the first rotating polyhedron 126 rotates in a counterclockwise direction and the second rotating polyhedron 128 rotates in a clockwise direction).
  • the control device 160 controls the rotation of the first rotating polyhedron 126 and the second rotating polyhedron 128 to change the incident angle of the first light to the first rotating polyhedron 126 and the second rotating polyhedron 128.
  • the current image frame includes Z preset periods.
  • the first rotating polyhedron 126 and the second rotating polyhedron 128 are rotated 60 degrees in opposite directions at the same speed around the central axis, and the first rotation
  • the rotation of the polyhedron 126 and the second rotating polyhedron 128 sequentially changes the angle between each beam of first light incident at each preset period and the side of the incident first rotating polyhedron 126 and the second rotating polyhedron 128 to adjust each beam
  • the optical path of the first light causes the emitted second light to be respectively guided to the sub-areas in the preset illumination area which is different from the previous one or more image frames of the current image frame.
  • the optical path switching device 120 emits the first light emitted by each first luminous body 111 or each second luminous body 112 in the array light source 110 into second light after the optical path is adjusted, and the second light is imaged to the wavelength after passing through the relay device
  • Each sub-area of the preset illumination area on the surface of the conversion device 140 excites third light to form a third light field with a specific brightness distribution.
  • the light modulation device 600 is configured to perform secondary modulation on the third light emitted by the light source system 100 to obtain image light.
  • the control device 160 controls the light modulation device 600 to modulate the third light according to the image data of the image to be displayed and the illuminance distribution of the pre-modulated third light received on the surface of the light modulation device 600.
  • some examples of the light modulation device 600 are Digital Micro-mirror Device (DMD), Liquid Crystal on Silicon (LCOS), Liquid Crystal Display (LCD), etc.
  • the third light field is an array of partially overlapping light spots.
  • the third light can be collimated by a collimating device and formed on the light modulation device 600 The third light field with light and dark distribution and smooth transition.
  • the third light is secondarily modulated by the light modulation device 600 and then projected onto the screen through the lens device 700 to obtain a display image.
  • the display device 10 in the embodiment of the present invention further includes guiding elements known in the art, such as relay devices, collimating devices, etc., which will not be illustrated here.
  • a second luminous body 112 is added to the array light source 110 for redundant backup to ensure that one or more of the first luminous bodies 111 fail or After aging, the second luminous body 112 replaces the failed or aging first luminous body 111 to emit first light to maintain the normal operation of the entire array light source 110, which is beneficial to improve the life of the array light source 110; the first luminous body 111 (or replaces the first luminous body 111) One luminous body 111 emits the first light and the second luminous body 112) takes turns responsible for the illumination of each sub-area during different image frames, avoiding one or more first luminous bodies 111 (or replacing the first luminous body 111 to emit the first light).
  • the one-light second luminous body 112 is responsible for the illumination of high-brightness sub-regions for a long time, and the brightness decays faster, so that each first luminous body 111 (or the second luminous body 112 that emits the first light instead of the first luminous body 111)
  • the load remains relatively uniform, which is beneficial to reduce the probability of display dead pixels due to damage of individual first luminous bodies 111.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

一种光源系统（100）包括：阵列光源（110），包括X个可独立调节亮度的第一发光体（111）和Y个可独立调节亮度的第二发光体（112），每个第一发光体（111）用于发出一束或多束第一光，当至少一个第一发光体（111）的最大发光功率小于等于预设衰减阈值时，第二发光体（112）中的至少一个取代最大发光功率小于预设衰减阈值的第一发光体（111）发出第一光；以及光路切换装置（120），用于调节所述第一光的传播方向，使第一光经光路调整后成为第二光并被引导至预设照明区域中。第二发光体（112）由此可取代故障或老化的第一发光体（111）发出第一光以维持整个阵列光源（110）的正常工作。还提供一种显示设备。

Description

光源系统及显示设备 技术领域
本发明涉及显示技术领域，尤其涉及一种光源系统及显示设备。
背景技术
本部分旨在为权利要求书中陈述的本发明的具体实施方式提供背景或上下文。此处的描述不因为包括在本部分中就承认是现有技术。
在显示技术领域，通常采用光源阵列作为投影设备光源，每个光源负责一个区域的照明，在投影显示时，根据画面各个区域的峰值亮度来动态控制光源的发光强度，以实现高对比度显示，但是在一幅画面中，通常会中间区域图像的灰度值较高，周围区域图像的灰度值较低，从而使负责中间分区照明的光源的亮度较高，负责周围分区照明的光源的亮度较低，在一段时间后，中间分区的光源的亮度衰减较大，当其亮度衰减到最初的80％时，整个光源阵列即需要进行更换，没有充分利用光源阵列的整体寿命。在某个或某几个光源出现问题后，投影画面会出现暗区，整个投影系统需要停止放映进行光源维护。当蓝激光器阵列不同分区的激光器中心波长相差3nm时，其蓝场的色差就会被普通观众觉察。如果中间光源与周围光源的老化程度不一致，容易引起人眼能觉察的色差。
发明内容
本发明第一方面提供一种光源系统，包括：
阵列光源，包括X个可独立调节亮度的第一发光体和Y个可独立调节亮度的第二发光体，每个第一发光体用于发出一束或多束第一光，当至少一个第一发光体的最大发光功率小于等于预设衰减阈值时，所述第二发光体中的至少一个取代最大发光功率小于预设衰减阈值的第一发光体发出第一光；以及
光路切换装置，用于调节所述第一光的传播方向，使所述第一光经光路调整后成为第二光并被引导至预设照明区域中。
本发明第二方面提供一种显示设备，所述显示设备包括上述光源系统。
本发明实施例提供的光源系统及显示设备通过增加第二发光体用于冗余备份，保证在第一发光体中的某个或某几个出现故障或老化后，第二发光体可取代故障或老化的第一发光体发出第一光以维持整个阵列光源的正常工作，有利于提升阵列光源的寿命，降低第一发光体老化后发光不一致导致的色差。
附图说明
为了更清楚地说明本发明实施例/方式技术方案，下面将对实施例/方式描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例/方式，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为本发明实施例提供的显示设备的结构示意图。
图2为本发明实施例提供的光路切换装置的入光口与出光口的光路映射关系示意图。
图3为本发明实施例提供的光路切换装置的结构示意图。
图4为本发明实施例提供的光路切换装置在另一变更实施例中的结构示意图。
主要元件符号说明
显示设备 10
光源系统 100
阵列光源 110
第一发光体 111
第二发光体 112
光路切换装置 120
入光口 121a
出光口 121b
第一反射元件 122
第一微反射镜 122a
第二反射元件 124
第二微反射镜 124a
第一旋转多面体 126
第一反射镜 126a
第二旋转多面体 128
第二反射镜 128a
波长转换装置 140
控制装置 160
光调制装置 600
镜头装置 700
如下具体实施方式将结合上述附图进一步说明本发明。
具体实施方式
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施例对本发明进行详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本发明，所描述的实施例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。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。
请参阅图1，为本发明优选实施例提供的显示设备10的结构示意图。显示设备10可以为影院投影机、激光电视、商教投影机及微型投影仪中的一种。本发明实施例中以投影设备为例进行说明，可以理解的是，显示设备10还可以是上述提到的其他设备。
显示设备10包括光源系统100、光调制装置600及镜头装置700。本发明实施例中提供的光源系统100用于发出预调制后的第三光，光调制装置600用于对光源系统100出射的第三光进行二次调制得到图像光，图像光自镜头装置700出射形成显示图像。
光源系统100包括阵列光源110、光路切换装置120、波长转换装置140及控制装置160，阵列光源110、光路切换装置120及光调制装置600分别与控制装置160电连接。
其中，阵列光源110包括X个可独立调节亮度的第一发光体111和Y个可独立调节亮度的第二发光体112，第一发光体111和第二发光体112皆用于发出第一光。光路切换装置120用于调节阵列光源110发出的第一光的传播方向，使每束第一光经光路调整后成为第二光并分别被引导至预设照明区域中的一个子区域。所述预设照明区域设置于波长转换装置140上，波长转换装置140用于将光路切换装置120出射的第二光进行波长转换并得到第三光。控制装置160用于控制光路切换装置120以预设帧率将所述阵列光源110发出的第一光分别引导至预设照明区域中与当前图像帧的上一个或多个图像帧不同的子区域。
具体地，阵列光源110为激光光源，在其他实施例中阵列光源110还可为激光荧光粉光源、灯泡光源、发光二极管光源等。本实施例中阵列光源110为蓝色光源，发出蓝色第一光。可以理解的是，阵列光源110不限于蓝色光源，阵列光源110也可以是紫色光源、橙色光源、黄色光源、红色光源或绿色光源等。本实施例中，第一发光体111和第二发光体112均为蓝色激光器，用于发出蓝色激光作为第一光。每个第一发光体111和每个第二发光体112可发出一束或多束第一光。由于一般地显示画面呈长方形，故X个第一发光体111呈m*n矩阵排布，可以理解的是，X个第一发光体111还可以呈其他形状的阵列排 布。第二发光体112用于当至少一个第一发光体111的最大发光功率小于等于预设衰减阈值时，第二发光体中的至少一个取代最大发光功率小于预设衰减阈值的第一发光体发出第一光。在一种实施例中，控制装置160可确定最大发光功率小于预设衰减阈值的第一发光体111并切断相应的第一发光体111的驱动电流。可以理解的是，阵列光源110中具体第一发光体111和第二发光体112的数量可以依据实际需要进行选择。
本实施例通过在阵列光源110中增加第二发光体112用于冗余备份，保证在第一发光体111中的某个或某几个出现故障或老化后，第二发光体112能够取代故障或老化的第一发光体111以维持整个阵列光源110的正常工作，此有利于提升阵列光源110的整体寿命，降低第一发光体111老化后发光不一致导致的色差。此外，在一个或多个第一发光体111出现故障后，由于有第二发光体112作为冗余备份，因此投影画面不会出现明显暗区，不需要将整个投影系统即时停止放映进行光源维修。
波长转换装置140表面包括用于接收光路切换装置120出射的第二光的预设照明区域，预设照明区域包括Z个子区域，Z个子区域呈阵列排布，本实施例中第一发光体111的数量X大于等于所述子区域的数量Z，使得在连续的多个图像帧期间不同的第一发光体111可依次负责一个子区域的照明且每个第一发光体111可依次负责不同子区域的照明。在其它实施例中第一发光体111的数量X可小于所述子区域的数量Z。波长转换装置140表面还设置有用于将第二光进行波长转换的转换区域，所述预设照明区域位于第二光光路上的所述转换区域内，所述转换区域时刻位于第二光的光路上。波长转换装置140表面的所述转换区域设置有波长转换材料。在第二光的激发下，所述波长转换材料将第二光进行波长转换得到第三光。
本实施例不限定波长转换装置140的具体形式。在一种实施例中，波长转换装置140为固定式荧光片，所述预设照明区域在荧光片上的位置是固定的。荧光片表面设置有黄色荧光粉或黄色荧光粉与蓝色荧光粉的组合，或者其他波长转换材料。在另一种实施例中，波长转换 装置140为色轮组件，由于第二光在色轮组件表面形成的光斑相对于色轮组件上一固定点的相对位置是时刻变化的，从而所述预设照明区域在色轮表面的位置随着色轮组件的周期性运动而时刻变化。色轮组件表面设置有波长转换材料，色轮组件在其驱动单元的驱动下周期性运动，优选地，色轮组件设置有滤光单元，波长转换材料出射的第三光经过滤光单元的滤光后出射。色轮组件可为反射式色轮或透射式色轮。
控制装置160还用于根据每帧待显示图像的图像数据计算每个子区域的峰值亮度以控制与每个子区域在当前图像帧所对应的发光体的发光功率，如此可提高光源的利用率。
如图2所示，在一种实施例中，光路切换装置120包括多个入光口121a和多个出光口121b，控制装置160以预设帧率控制自一个入光口121a入射的第一光自与当前图像帧的上一个或多个图像帧不同的出光口121b出射为第二光，使得在连续的多个图像帧期间不同的入光口入射的第一光可依次从不同出光口出射。预设帧率具有频率单位，预设帧率与每个图像帧周期的乘积为1，在其它实施例中，预设帧率还可与多个图像帧周期的乘积为1。本实施例中，所述入光口121a的数量大于等于所述出光口121b的数量。在其它实施例中，所述入光口121a的数量可小于所述出光口121b的数量。
本实施例中，每个图像帧期间包括Z个预设时段，在每个图像帧期间控制装置160通过光路切换装置120在每个预设时段控制每个第一发光体111(或每个取代第一发光体111发出第一光的第二发光体112)发出的第一光照射至与当前图像帧的上一个或多个图像帧不同的子区域，以每个第一发光体111或每个第二发光体112发出一束第一光为例进行说明，每束第一光分别入射至光路切换装置120的一个入光口121a。阵列光源110包括编号为0～(Z-1)的Z个发出第一光的第一发光体111(或包括部分取代第一发光体111发出第一光的第二发光体112)，预设照明区域包括编号为0～(Z-1)的Z个子区域，每束第一光负责一个子区域的照明。在每个图像帧的第1个预设时段中，控制装置160控制光路切换装置120将第i个第一发光体111或第二 发光体112发出的第一光引导至第i个子区域，其中0≤i＜(Z-1)；在每个图像帧的第k个预设时段中，控制装置160控制光路切换装置120将第i个第一发光体111或第二发光体112发出的第一光引导至第(i+k)mod N个子区域中，其中0≤k＜Z，在每个预设时段中，每个第一发光体111或第二发光体112对应的子区域与i+k对N的余数有关。在一种实施例中，每帧待显示图像包括多个像素单元，所述阵列光源中一个第一发光体或第二发光体负责一个或多个像素单元的照明，所述待显示图像中处于中间区域的每个像素单元在每帧图像中由不同的第一发光体或第二发光体负责照明。在一种实施例中，所述待显示图像中处于中间区域的每个像素单元在每帧图像中由不同的第一发光体或第二发光体负责照明。如此有利于避免负责高亮子区域的第一发光体111长时间处于高亮度状态出现的的亮度衰减较大的现象。每个第一发光体111或第二发光体112轮循着负责各个子分区的照明，有利于整个阵列光源110中每个第一发光体111或第二发光体112的亮度衰减速度(老化)保持相对一致，降低了由于一个或多个第一发光体111损坏而导致出现显示坏点的几率。
本发明实施例中的图像中间区域指的是，将待显示图像以显示区域的中心为原点等比例缩放至40％-80％面积的区域。
请参阅图3，本实施例中，光路切换装置120包括相互平行设置的第一反射元件122与第二反射元件124，其中第一反射元件122与入射的第一光呈45度角。第一反射元件122与第二反射元件124分别包括阵列排布的多个第一微反射镜122a及多个第二微反射镜124a，在本实施例中，第一反射元件122中的第一微反射镜122a的数量大于等于第二反射元件124中的第二微反射镜124a的数量。在其他实施例中，第一微反射镜122a的数量可小于第二微反射镜124a的数量。控制装置160通过控制第一微反射镜122a和第二微反射镜124a的偏转以改变第一光分别与第一微反射镜122a和第二微反射镜124a的入射角度，从而将每个第一发光体111或第二发光体112发出的第一光分别引导至预设照明区域中与当前图像帧的上一个或多个图像帧不同的子区域。在控制装置160的控制下，每个第一发光体111或第二发光 体112发出的第一光依次经过至少一个第一微反射镜122a及至少一个第二微反射镜124a的反射后出射为第二光。在本实施例中，每个第一发光体111和每个第二发光体112为蓝色激光器，由于每个激光器发出的第一光为光束直径较窄的平行光，第一光经过第一微反射镜122a及第二微反射镜124a的反射后，光束直径及光束发散角不变，从而可以保证光路切换装置120出射的每束第二光照射至预设照明区域的一子区域中。
在一种实施例中，第一微反射镜122a及第二微反射镜124a均为双轴可控反射镜，即第一微反射镜122a与第二微反射镜124a能够在第一方向及第二方向上升降、旋转或移动，其中，第一方向与第二方向相互垂直，使得光路切换装置120能够对入射的每束第一光进行光路调整以使每束出射的第二光能够照射至不同的子区域中。在另一种实施例中，第一微反射镜122a及第二微反射镜124a均为三轴可控反射镜，即第一微反射镜122a与第二微反射镜124a能够在三维空间中升降、旋转或移动。每个图像帧期间控制装置160根据待显示图像的图像数据控制每个第一微反射镜122a和每个第二微反射镜124a的偏转方向，比如，在上一图像帧中，第j个第一微反射镜122a出射的光线照射至第j个第二微反射镜124a；在当前图像帧期间，第j个第一微反射镜122a出射的光线照射至第j+1个第二微反射镜124a……以此类推。
请参阅图4，在另一种变更的实施例中，光路切换装置120包括第一旋转多面体126和第二旋转多面体128，其中第一旋转多面体126的一个或多个侧面上阵列分布有多个第一反射镜126a，第二旋转多面体128的一个或多个侧面上阵列分布有多个第二反射镜128a。本实施例中，第一旋转多面体126和第二旋转多面体128均具有六个侧面，第一旋转多面体126的每个侧面上均阵列分布有多个第一反射镜126a，第二旋转多面体128的每个侧面上均阵列分布有多个第二反射镜128a，第一旋转多面体126和第二旋转多面体128围绕垂直于除所述侧面外的两个底面的几何中心轴沿相反方向旋转(第一旋转多面体126沿顺时针方向旋转、第二旋转多面体128沿逆时针方向旋转或第 一旋转多面体126沿逆时针方向旋转、第二旋转多面体128沿顺时针方向旋转)。控制装置160通过控制第一旋转多面体126和第二旋转多面体128的旋转以改变第一光与第一旋转多面体126和第二旋转多面体128的入射角度。具体地，例如，当前图像帧包括Z个预设时段，每个预设时段期间第一旋转多面体126和第二旋转多面体128正好围绕中心轴以相同速度沿相反方向旋转60度，通过第一旋转多面体126和第二旋转多面体128的旋转时序地改变每个预设时段入射的每束第一光与所入射的第一旋转多面体126和第二旋转多面体128的侧面的夹角，以调整每束第一光的光路从而使出射的第二光分别引导至所述预设照明区域中与当前图像帧的上一个或多个图像帧不同的子区域。
光路切换装置120将阵列光源110中每个第一发光体111或每个第二发光体112发出的第一光经光路调整后出射为第二光，第二光经过中继器件后成像至波长转换装置140表面的预设照明区域的每个子区域，激发出第三光形成具有特定亮度分布的第三光光场。
光调制装置600用于对光源系统100出射的第三光进行二次调制得到图像光。控制装置160根据待显示图像的图像数据以及光调制装置600表面接收到的预调制后的第三光的光照度分布，控制光调制装置600对第三光进行调制。具体地，光调制装置600的一些示例是数字微反射镜(Digital Micro-mirror Device，DMD)、硅基液晶(Liquid Crystal on Silicon，LCOS)、液晶面板(Liquid Crystal Display，LCD)等。
由于波长转换装置140中的荧光的扩散特性，第三光光场为有部分交叠的光斑阵列，可选地，可利用准直器件对第三光进行准直后在光调制装置600上形成具有亮暗分布且平滑过渡的第三光光场。第三光经过光调制装置600的二次调制后通过镜头装置700投射到屏幕上得到显示图像。
另外，本发明实施例中显示设备10还包括本领域公知的引导元件，如中继器件、准直器件等，在此不一一举例。
本发明实施例提供的光源系统100及显示设备10，通过在阵列光源110中增加第二发光体112用于冗余备份，保证在第一发光体111 中的某个或某几个出现故障或老化后，第二发光体112取代故障或老化的第一发光体111发出第一光以维持整个阵列光源110的正常工作，有利于提升阵列光源110的寿命；第一发光体111(或取代第一发光体111发出第一光的第二发光体112)在不同图像帧期间轮流负责每个子区域的照明，避免了某个或多个第一发光体111(或取代第一发光体111发出第一光的第二发光体112)长期负责高亮度子区域的照明更快出现亮度衰减，使得各个第一发光体111(或取代第一发光体111发出第一光的第二发光体112)的负荷保持相对一致，有利于降低由于个别第一发光体111损坏而导致出现显示坏点的几率。
对于本领域技术人员而言，显然本发明不限于上述示范性实施例的细节，而且在不背离本发明的精神或基本特征的情况下，能够以其他的具体形式实现本发明。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本发明的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化涵括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。此外，显然“包括”一词不排除其他单元或步骤，单数不排除复数。装置权利要求中陈述的多个装置也可以由同一个装置或系统通过软件或者硬件来实现。第一，第二等词语用来表示名称，而并不表示任何特定的顺序。
最后应说明的是，以上实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或等同替换，而不脱离本发明技术方案的精神和范围。

Claims (12)

  1. 一种光源系统，其特征在于，包括：
    阵列光源，包括X个可独立调节亮度的第一发光体和Y个可独立调节亮度的第二发光体，每个第一发光体用于发出一束或多束第一光，当至少一个第一发光体的最大发光功率小于等于预设衰减阈值时，所述第二发光体中的至少一个取代最大发光功率小于预设衰减阈值的第一发光体发出第一光；以及
    光路切换装置，用于调节所述第一光的传播方向，使所述第一光经光路调整后成为第二光并被引导至预设照明区域中。
  2. 如权利要求1所述的光源系统，其特征在于，所述光源系统还包括控制装置，用于控制所述光路切换装置以预设帧率将所述阵列光源发出的第一光分别引导至预设照明区域中的多个子区域中。
  3. 如权利要求1或2所述的光源系统，其特征在于，每帧待显示图像包括多个像素单元，所述阵列光源中一个第一发光体或第二发光体负责一个或多个像素单元的照明，所述待显示图像中处于中间区域的每个像素单元在每帧图像中由不同的第一发光体或第二发光体负责照明。
  4. 如权利要求1或2所述的光源系统，其特征在于，所述光路切换装置包括多个入光口和多个出光口，所述控制装置控制每个入光口入射的所述第一光从与当前图像帧的上一个或多个图像帧不同的出光口出射为第二光。
  5. 如权利要求4所述的光源系统，其特征在于，所述光路切换装置包括第一反射元件和第二反射元件，所述第一反射元件和所述第二反射元件分别包括阵列排布的多个第一微反射镜和多个第二微反射镜，所述控制装置通过控制所述第一微反射镜和所述第二微反射镜的偏转以改变所述第一光与所述第一微反射镜和所述第二微反射镜的入射角度，从而将所述第一光分别引导至所述预设照明区域中与当前图像帧的上一个或多个图像帧不同的子区域。
  6. 如权利要求5所述的光源系统，其特征在于，所述第一微反射 镜和所述第二微反射镜为双轴可控反射镜或三轴可控反射镜。
  7. 如权利要求4所述的光源系统，其特征在于，所述光路切换装置包括第一旋转多面体和第二旋转多面体，所述第一旋转多面体和所述第二旋转多面体的一个或多个侧面上分别包括阵列分布的多个第一反射镜和多个第二反射镜，所述控制装置通过控制所述第一旋转多面体和第二旋转多面体的旋转以改变所述第一光与所述第一旋转多面体和所述第二旋转多面体的入射角度，从而将所述第一光分别引导至所述预设照明区域中与当前图像帧的上一个或多个图像帧不同的子区域。
  8. 如权利要求2所述的光源系统，其特征在于，所述控制装置还用于根据每帧待显示图像的图像数据计算每个所述子区域的峰值亮度以控制负责每个所述子区域的照明的所述第一发光体或所述第二发光体的发光功率。
  9. 如权利要求1或2所述的光源系统，其特征在于，所述第一发光体和所述第二发光体均为激光器。
  10. 如权利要求1或2所述的光源系统，其特征在于，所述光源系统还包括用于将所述光路切换装置出射的第二光进行波长转换得到第三光的波长转换装置，所述预设照明区域设置于所述波长转换装置的表面上且位于所述第二光的光路上。
  11. 一种显示设备，其特征在于，所述显示设备包括如权利要求1-10任意一项所述的光源系统。
  12. 如权利要求11所述的显示设备，其特征在于，所述显示设备还包括光调制装置，用于根据待显示图像的图像数据对波长转换装置出射的第三光进行二次调制。
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