WO2018006638A1 - 一种显示系统及方法 - Google Patents

一种显示系统及方法 Download PDF

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Publication number
WO2018006638A1
WO2018006638A1 PCT/CN2017/082409 CN2017082409W WO2018006638A1 WO 2018006638 A1 WO2018006638 A1 WO 2018006638A1 CN 2017082409 W CN2017082409 W CN 2017082409W WO 2018006638 A1 WO2018006638 A1 WO 2018006638A1
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WO
WIPO (PCT)
Prior art keywords
light
light source
display system
modulator
controllable units
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/CN2017/082409
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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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Filing date
Publication date
Application filed by Appotronics Corp Ltd filed Critical Appotronics Corp Ltd
Priority to US16/314,899 priority Critical patent/US11003064B2/en
Priority to EP17823450.6A priority patent/EP3480656B1/en
Publication of WO2018006638A1 publication Critical patent/WO2018006638A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • 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
    • G03B21/147—Optical correction of image distortions, e.g. keystone
    • 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
    • G03B21/2013—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
    • G03B21/2006—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
    • G03B21/2053—Intensity control of illuminating 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
    • 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
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
    • 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

Definitions

  • the present application relates to the field of projection and display, and in particular to a display system and method.
  • the existing display mainly comprises a light source, a first photoelectric modulator, an imaging system, a second photoelectric modulator, a projection screen and the like. According to a certain image signal, the two photoelectric modulators are required to control the light beam, and the structure is complicated. And it is easy to make mistakes.
  • the internal reflection prism is used to change the direction of light propagation. Because the cone angle of the light developed by the internal reflection prism is too large, the spherical aberration and astigmatism caused by the difference in the dispersion of the spot on the photoelectric modulator are different. Large, resulting in distortion and color deviation in the system imaging, poor color uniformity, the quality of the imaging display is not ideal.
  • a display system including a light source device, an optical processing assembly, a reflection device, and a light modulator; a light source device for emitting a plurality of beams; and an optical processing assembly for each beam from the light source device
  • the light is optically adjusted such that it illuminates the reflecting device at a predetermined cone angle;
  • the reflecting means is for reflecting the beam from the optical processing assembly to the light modulator;
  • the light modulator comprises a plurality of controllable units, the arrangement of the reflecting means being such that The reflected light is correspondingly irradiated to a group of controllable units, and the light modulator is used to modulate the light beam by each controllable unit to emit the desired display light.
  • a display method comprising:
  • the invention simultaneously controls the solid-state light source array end and the spatial light modulator end, so that the laser beam emitted by the solid-state light source array is further modulated in the spatial light modulator, thereby emitting the display light for generating a more approximate desired image, thereby avoiding
  • the easy-to-produce error through the design of the preset tilt angle, makes the difference in the dispersion of the spot on the spatial light modulator smaller, reduces the distortion and color deviation in the imaging of the display system, and improves the image quality and the display effect of the picture.
  • FIG. 1 is a schematic structural diagram of a display system according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural view of a rectangular homogenizing rod of a display system according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic view showing a light cone angle in a display system according to Embodiment 1 of the present invention.
  • FIG. 4 is a diagram showing a correspondence relationship between a light cone illumination range and a pixel unit of a spatial light modulator according to Embodiment 1 of the present invention
  • FIG. 5 is a schematic diagram of a light cone illumination spatial light modulator in a prior art display system
  • FIG. 6 is a schematic diagram showing a difference in the degree of dispersion of a spot on a spatial light modulator in a display system of the prior art
  • FIG. 7 is a schematic diagram of a light cone illumination spatial light modulator in a display system according to Embodiment 1 of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the display system of the present embodiment includes a light source device 10, an optical processing component, a reflection device 30, a spatial light modulator 40, a controller, and a screen; the controller is respectively associated with the light source device 10 and the spatial light modulator 40.
  • the optical processing assembly includes a first relay lens group 201, a light homogenizing rod unit 202, and a second relay lens group 203.
  • the light source device 10 is a solid-state light source array for emitting a plurality of light beams; the spatial light modulator 40 includes a plurality of controllable units, that is, pixel units, and each of the solid-state light sources of the light source device 10 emits a light beam corresponding to the spatial light modulator 40. a set of pixel units.
  • the solid-state light source includes a laser and an LED, and the laser and the laser array will be described as an example unless otherwise specified.
  • the controller first receives the control signal, and the control signal may be information including each pixel in the image of one frame.
  • the controller controls each laser of the laser array 10 to emit light according to the control signal, and the light emitted by each laser has an independent state, for example, each The laser may be controlled to turn on or off according to a control signal or to control it to emit a laser beam having a different light intensity or brightness.
  • the light source device may also be designed as a single laser light source in combination with a light modulator. Each controllable unit of the light modulator separately modulates the laser light irradiated thereon according to the control signal, as long as it can be achieved.
  • the laser light emitted by the laser light source can be decomposed into light beams of different states.
  • the laser array 10 emits the respective beams to the first relay lens group 201.
  • the laser beam emitted by the laser array 10 has a certain divergence, and cannot be regarded as a pure
  • the light beam correspondingly, the laser beam emerging from the optical processing assembly is in a light cone state with a cone angle.
  • the first relay lens group 201 functions to converge the respective light beams to the light homogenizing rod unit 202.
  • the light-diffusing rod unit 202 of the present embodiment adopts a rectangular light-dancing rod array as shown in FIG. 2, thereby facilitating the uniformization processing of the respective light beams from the first relay lens group 201 and exiting to the second relay lens.
  • Fig. 2(a) is a front view of a rectangular homogenizing rod
  • Fig. 2(b) is a side view.
  • Any of the lasers of the laser array 10 corresponds to one of the homogenizing rod arrays 202, and the laser and the homogenizing rods correspond to a set of pixel units of the spatial light modulator 40.
  • the second relay lens group 203 can adopt the classic TRP (tilt&roll) Pixel, tilt flip pixel) illumination light path; the second relay lens group 203 is composed of different lenses, and the design is to achieve the purpose of adjusting the light beams from the light homogenizing rod unit 202 so that each light is preset The light cone angle is irradiated to the reflecting device 30, and the preset light cone angle is less than or equal to 34°.
  • the preset light cone angle ranges from 16° to 34°.
  • the light beam is After undergoing a series of transmission and refraction effects in the second relay lens group 203, the reflection device 30 is irradiated with a preset light cone angle of 34°, where the 34° angle is obtained according to the principle of optical design,
  • the flip angle of the controllable unit of the spatial light modulator 40 is related to the optical component.
  • the spatial light modulator 40 of the present embodiment preferably supports a 34° cone angle. If it is greater than 34°, the optical Efficiency and image quality are affected.
  • Those skilled in the art can design various optical processing components in combination with conventional techniques, as long as the angle of the light cone emitted to the reflecting device 30 can be 34 degrees, and is not limited to the structure provided in FIG.
  • the reflection device 30 can adopt a total internal reflection mirror, as shown in FIG. 3, so that the angle between the light cone of the light beam from the optical processing component and the light exit surface of the total internal reflection mirror is 17°-51° (an acute angle).
  • the angle between the light cone of the beam and the exit surface of the total internal mirror may be other ranges.
  • Spatial light modulator 40 of this embodiment can be used with variable transmittance displays, liquid crystal displays or digital micromirror components (DMD, Digital Mirror Device, Digital) Micromirror Device) and other technical implementations.
  • 4 is a schematic plan view of a spatial light modulator 40, including a plurality of independently addressable pixel units 401 (or DMD lenses), and an illumination area 001' of each light cone reflected by the reflection device 30 corresponds to a
  • the group of pixel units, the number of specific pixel units in a group of pixel units may be one or more.
  • the laser array 10 is formed in a one-to-one mapping relationship with hundreds of equally divided DMD working surfaces.
  • the control signal is also used to control the illumination area 003'.
  • the control signal is also used to control the illumination area 003'.
  • nine pixel units 401 nine pixel units 401 respectively corresponding to independent signal values, for example, controlling nine pixel units 401 to have independent deflection angles or inversion durations so that the light passing through each pixel unit 401 has different brightness
  • the irradiation area 003' in the figure is formed by the laser light 003 passing through the reflection device 30, such as the amount of light passing through or the value of the transmittance.
  • One pixel unit 401 may further include independently addressable sub-pixel units 4011, which may be associated with, for example, a particular color such as red, green, and blue.
  • Those skilled in the art can also use other conventional techniques to simultaneously control the laser array 10 end and the spatial light modulator 40 end, so that the laser beam emitted by the laser array 10 is further modulated in the spatial light modulator 40, using only the laser array. 10 can obtain the original image, and further modulation by the spatial light modulator 40 can be emitted to generate display light that is more approximate to the desired image, and can ensure that other dark areas outside the area of maximum brightness in the picture reach a sufficient dark picture, allowing dark The picture level at the time of the picture is more delicate and rich, and the display light is projected onto the screen and imaged to give the viewer a better visual experience.
  • the laser array 10 emits a light beam, wherein each laser corresponds to one of the homogenizing rods in the array of the homogenizing rods 202 and corresponds to a group of DMD lenses, and this embodiment can control each one by
  • the laser modulates the intensity of the emitted light of the emitted light beam, and controls the flip angle/time length of some or all of the DMD lenses of the set of DMD lenses corresponding to the laser to control the intensity of the emitted light of the light incident on the set of DMD lenses,
  • the beam is reflected to the lens, ie the laser and the DMD lens group are controlled in series, and a beam of light is controlled at both the laser end and the DMD lens end.
  • the direction of the central axis between the light source device 10 and the first relay lens group 201 is the first direction
  • the direction of the central axis between the lenses in the second relay lens group 203 is the second direction, as shown in FIG.
  • the first direction and the second direction are generally designed to be horizontal
  • the surface of the spatial light modulator 40 that receives the illumination is also horizontal
  • the two beams emitted by the second relay lens group 203 are Taking the first light cone 001 and the second light cone 002 as an example, the optical axis directions of the first light cone 001 and the second light cone 002 are also horizontal.
  • the apex of the light cone (which can be considered to have a diameter d') is not exactly on the horizontal line, and the second light cone 002 is ideal as shown in FIG.
  • the illumination area 002 of the second light cone 002 on the spatial light modulator 40 ‘just overlaps with a group of pixel units, and its diameter is d
  • the illumination area 001' of the first light cone 001 on the spatial light modulator 40 is too large, and its diameter d1 exceeds the area of a group of pixel units. Therefore, this phenomenon of the existing display system causes a large difference in the degree of dispersion of many spots (i.e., the irradiation area), affects the control of the light by the spatial light modulator 40, and reduces the image quality.
  • the laser array 10 is tilted upward in the horizontal direction according to a preset tilt angle, for example, tilted upward by 2°-3°, that is, the first direction is a horizontal line upward by 2°-3°, and the second direction is horizontal.
  • the optical axis directions of the first light cone 001 and the second light cone 002 that are irradiated to the reflecting device 30 are also horizontally upward by 2°-3°.
  • the second light cone 002 is taken as an ideal case, and the illumination area of the second light cone 002 on the spatial light modulator 40 is just right.
  • the corresponding area of the first light cone 001 on the spatial light modulator 40 has a diameter d2, and it can be clearly seen that d2 is smaller than d1, that is, the display of the embodiment is compared with the prior art.
  • the difference in the degree of dispersion of the spot on the spatial light modulator 40 is smaller or even negligible, and the image quality is improved.
  • the central axis direction between the lenses in the second relay lens group 203 that is, the second direction is inclined upward in the horizontal direction by a predetermined angle, the first direction is horizontal; or
  • the direction of the central axis between the lenses in the optical processing assembly is inclined upward in a horizontal direction by a predetermined angle, the first direction is horizontal; or the first direction and the second direction are both inclined upward by a predetermined angle, and the first angle can also be achieved.
  • the optical cone direction of the light cone 001 and the second light cone 002 is an effect of setting a horizontal angle upward by a predetermined angle.
  • the preset tilt angle may be inclined upward in the horizontal direction, and may be horizontally downward depending on the actual setting of the display system.
  • the first light cone 001 and the second light cone 002 may be along the optical axis direction by shifting the first direction or the second direction from the vertical tilt direction by a predetermined tilt angle.
  • the effect of the vertical direction deviating from the preset tilt angle is such that the difference in the degree of dispersion of the spot light finally irradiated onto the spatial light modulator 40 is smaller than in the prior art, improving the image quality and the display effect of the screen.
  • the display system and the display method of the invention can be used in the field of HDR (High-Dynamic Range) high dynamic contrast digital imaging and projection display technology, for example, can be used as DLP (Digital) for applying TRP illumination.
  • Light Procession in the projector.
  • the laser light source can be switched and modulated at a high speed so that each laser light source can realize the function of the first photoelectric modulator, so that the laser light emitted by the laser array 10
  • the beam is further modulated by the spatial light modulator 40 by individually controlling each laser and the DMD local area mapped thereto to effect an HDR function, thereby exiting the display light for producing a more approximate desired image, after the display light is projected onto the screen.
  • the present invention uses only one spatial light modulator, which not only simplifies the optical path structure, but also avoids the cause. Controlling the error that is easily generated by the two spatial light modulators is more in line with the interests of the user, and at the same time, it can ensure that the dark areas outside the area with the maximum brightness in the picture reach a sufficient dark picture, so that the picture level in the dark picture is more delicate and rich. Give viewers a better visual experience.
  • the present invention solves the problem that the difference in the dispersion degree of the spot light on the spatial light modulator in the conventional display system is large, reduces the distortion and color deviation in the imaging of the display system, and the brightness and the color are more uniform, and the image is more similar. Improve the quality of the image and the display of the picture.
  • the solution of these problems allows the technician to design a more detailed mapping relationship in the DMD work surface and provide better hardware support for the implementation of the HDR function.
  • the improvement of the invention does not require the addition of more optical components or optical modulation devices, and significant improvements can be achieved by using the cost and conditions comparable to the prior art, which is of great significance to developers, manufacturers and users of display systems. .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Projection Apparatus (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

一种显示系统及方法，包括光源装置（10）、光学处理组件、反射装置（30）、光调制器（40）和控制器。光源装置（10）用于发射多束光；光学处理组件用于对来自光源装置（10）的每一束光进行光路调节从而使其以预设光锥角照射到反射装置（30）；反射装置（30）用于将来自光学处理组件的光束反射到光调制器（40）；控制器分别与光源装置（10）和光调制器（40）相连接，并对光源装置（10）的发光状态进行控制；光调制器（40）用于通过各个可控单元对光束进行调制从而出射符合要求的显示光。

Description

一种显示系统及方法 技术领域
本申请涉及投影、显示领域，具体涉及一种显示系统及方法。
 背景技术
现有的显示器主要包括光源、第一光电调制器、成像系统、第二光电调制器、投影屏幕等组成单元，根据某一图像信号，需要利用两个光电调制器对光束进行控制，结构复杂，且容易产生差错。
技术问题
对于某些显示器中的设计，使用内反射棱镜对光的传播方向进行改变，由于内反射棱镜展开的光锥角过大，形成的球差和像散导致光电调制器上的光斑弥散程度差异较大，导致系统成像中产生畸变与颜色偏差，颜色均匀性差，成像显示的质量不够理想。
 技术解决方案
根据本发明的一方面，提供一种显示系统，包括光源装置、光学处理组件、反射装置、光调制器；光源装置用于发射多束光；光学处理组件用于对来自光源装置的每一束光进行光路调节从而使其以预设光锥角照射到反射装置；反射装置用于将来自光学处理组件的光束反射到光调制器；光调制器包括多个可控单元，反射装置的设置使得其反射的一束光对应照射到一组可控单元，光调制器用于通过各个可控单元对光束进行调制从而出射符合要求的显示光。
根据本发明的第二方面，提供一种显示方法，包括：
控制固态光源阵列发光并控制每一个固态光源来调制该固态光源发出光束的出光强度；
控制该固态光源对应的一组可控单元中的一个或多个可控单元的翻转角度/时长，从而控制通过该组可控单元的光束的出射光强度。
 有益效果
本发明通过在固态光源阵列端和空间光调制器端同时进行控制，使得固态光源阵列发射的激光光束在空间光调制器得到进一步调制，从而出射用以产生更近似期望图像的显示光，避免了容易产生的差错，通过预设倾角的设计，使得空间光调制器上的光斑弥散程度差异更小，减小了显示系统成像中的畸变与颜色偏差，提高了成像质量和画面的显示效果。
 附图说明
图1为本发明实施例一的显示系统结构示意图；
图2为本发明实施例一的显示系统的矩形匀光棒结构示意图；
图3为本发明实施例一的显示系统中光锥角度示意图；
图4为本发明实施例一的空间光调制器上光锥照射范围与像素单元对应关系图；
图5为现有技术的显示系统中光锥照射空间光调制器示意图；
图6为现有技术的显示系统中空间光调制器上光斑弥散程度差异示意图；
图7为本发明实施例一的显示系统中光锥照射空间光调制器示意图。
 本发明的最佳实施方式
下面通过具体实施方式结合附图对本申请作进一步详细说明。
实施例一：
如图1所示，本实施例的显示系统包括光源装置10、光学处理组件、反射装置30、空间光调制器40、控制器、屏幕；控制器分别与光源装置10和空间光调制器40相连接；光学处理组件包括第一中继透镜组201、匀光棒单元202、第二中继透镜组203。
光源装置10为固态光源阵列，用于发射多束光束；空间光调制器40包括多个可控单元即像素单元，光源装置10的每一个固态光源发射的一束光束都对应空间光调制器40的一组像素单元。需要说明的是，固态光源包括激光器和LED，以下除非有特别说明之外，将以激光器和激光器阵列为例进行说明。
本实施例的显示系统产生显示光的原理简述如下：
控制器首先接收到控制信号，控制信号可以是包含一帧图像中各像素的信息，控制器根据控制信号控制激光器阵列10的每一个激光器发光，各激光器所发出的光具有独立的状态，例如各激光器可以是根据控制信号控制其开或关状态或者控制其发出具有不同光强或亮度的激光光束。在本发明的其它实施方式中，光源装置也可以设计成单个激光光源搭配光调制器的方式，光调制器的各个可控单元根据控制信号将照射到其上的激光分别进行调制，只要能达到将激光光源发射的激光分解成不同状态的光束即可。
激光器阵列10将各光束发射到第一中继透镜组201，在实际应用中，从显示系统的光学元件的尺度来考量，激光器阵列10发射的激光光束具有一定的发散，而不能视为一纯粹的光线，相应地，从光学处理组件出射的激光光束则为光锥形态，具有光锥角。第一中继透镜组201的作用在于将各光束汇聚到匀光棒单元202。本实施例的匀光棒单元202采用如图2所示的矩形匀光棒阵列，从而更有利于对来自第一中继透镜组201的各光束进行匀光处理并出射到第二中继透镜组203，图2(a)为矩形匀光棒正视图，图2(b)为侧视图。激光器阵列10的任一激光器对应匀光棒阵列202中的一个匀光棒，且该激光器与该匀光棒对应空间光调制器40的一组像素单元。第二中继透镜组203可采用经典的TRP（tilt&roll pixel，倾斜翻转像素）照明光路；第二中继透镜组203由不同透镜搭配而成，其设计所要达到的目的在于调节来自匀光棒单元202的各光束从而使每一束光都以预设光锥角照射到反射装置30，预设光锥角的取值小于等于34°，优选地，预设光锥角的取值范围为16°-34°，例如，本实施例中，光束在第二中继透镜组203中经历一系列的透射与折射作用后，以34°的预设光锥角照射到反射装置30，此处，34°角是根据光学设计的原理而得到的，跟空间光调制器40的可控单元的翻转角度有关，可以根据实际需要与光学元件做适应性调整，本实施例的空间光调制器40优选地支持34°光锥角，如果大于34°，光学效率以及成像质量会受影响。本领域技术人员结合常规技术手段，可以设计出各种方案的光学处理组件，只要能达到使出射到反射装置30的光锥角度为34°即可，不限于图1所提供的结构。
本实施例中反射装置30可采用全内反射镜，如图3所示，其设置使得来自光学处理组件的光束的光锥与全内反射镜的出光面夹角为17°-51°（锐角），在本发明的其它实施方式中，根据光束光锥角的不同，以及考虑到显示系统的整体设计，光束的光锥与全内反射镜的出光面夹角还可以是其它的范围。
本实施例的空间光调制器40（SLM， Spatial Light Modulators）的像素单元可以通过透射率可变型显示器、液晶显示器或数字微镜元件（DMD，Digital Mirror Device，Digital Micromirror Device）等技术实现。图4为空间光调制器40的平面示意图，包括多个可独立编址的像素单元401（或称DMD镜片），由反射装置30反射到其上的每一光锥的照射区域001’对应一组像素单元，一组像素单元中具体的像素单元个数可以是一个或多个。激光阵列10与被数百等分的DMD工作面形成一一映射关系，控制器利用某一控制信号控制激光器阵列10的某一激光器发射激光003时，还同时利用该控制信号控制照射区域003’对应的九个像素单元401，九个像素单元401分别对应独立的信号值，例如控制九个像素单元401发生各自独立的偏转角或翻转时长从而使通过每个像素单元401的光具有不同亮度、通光量或透过率值等，图中的照射区域003’即由激光003通过反射装置30后形成。一个像素单元401可以进一步包括可独立编址的次像素单元4011，次像素单元4011例如可以与红绿蓝等特定颜色相关联。本领域技术人员还可以采用其它常规技术手段，在激光器阵列10端和空间光调制器40端同时进行控制，使得激光器阵列10发射的激光光束在空间光调制器40得到进一步调制，仅利用激光器阵列10可以获得原始图像，而通过空间光调制器40的进一步调制可以出射用以产生更近似期望图像的显示光，能够保证画面中最大亮度的区域外的其它暗区域达到足够的暗画面，让暗画面时的画面层次更加细腻丰富，显示光投影到屏幕并成像后将带给观看者更好的视觉感受。
简单总结本实施例的光路控制原理即：激光器阵列10发出光束，其中，每一个激光器都对应匀光棒阵列202中的一个匀光棒且对应一组DMD镜片，本实施例可以通过控制每一个激光器来调制其发出光束的出光强度，并控制该激光器对应的该组DMD镜片中的一部分或全部DMD镜片的翻转角度/时长以控制入射于该组DMD镜片上的该束光的出射光强度，从而该束光被反射至镜头，即对激光器和DMD镜片组进行串联控制，一束光在激光器端和DMD镜片端都得到控制。
令光源装置10与第一中继透镜组201之间的中轴线方向为第一方向，令第二中继透镜组203中各透镜之间的中轴线方向为第二方向，如图5所示，现有技术的显示系统通常将第一方向和第二方向都设计为水平方向，空间光调制器40接收光照的面也为水平方向，以第二中继透镜组203出射的两束光即第一光锥001和第二光锥002为例，则第一光锥001和第二光锥002光轴方向也为水平方向。第一光锥001和第二光锥002被反射装置30反射后，光锥顶点（可认为具有直径d’）并不都刚好处于水平线上，如图6所示以第二光锥002作为理想情况考虑，第二光锥002在空间光调制器40上的照射区域002 ’刚好与一组像素单元对应重叠，其直径为d ’；而第一光锥001在空间光调制器40上的照射区域001’则偏大，其直径d1超出了一组像素单元的区域。因此，现有显示系统的这一现象导致许多光斑（即照射区域）弥散程度差异较大，影响了空间光调制器40对光的控制，降低了成像质量。
如图7所示，本实施例中将激光器阵列10按照预设倾角沿水平方向向上倾斜，例如向上倾斜2°-3°，即第一方向为水平线向上2°-3°，第二方向水平，则照射到反射装置30的第一光锥001和第二光锥002光轴方向也为水平线向上2°-3°。则第一光锥001和第二光锥002被反射到空间光调制器40上后，以第二光锥002作为理想情况考虑，第二光锥002在空间光调制器40上的照射区域刚好与一组像素单元对应重叠，第一光锥001在空间光调制器40上的照射区域其直径为d2，且明显可以看出d2小于d1，即与现有技术相比，本实施例的显示系统在空间光调制器40上的光斑弥散程度差异更小甚至可忽略，成像质量得以提高。在本发明的其它实施方式中，还可以是将第二中继透镜组203中各透镜之间的中轴线方向即第二方向沿水平方向向上倾斜预设的角度，第一方向水平；或者是将光学处理组件中各透镜之间的中轴线方向沿水平方向向上倾斜预设的角度，第一方向水平；或者是第一方向和第二方向都向上倾斜预设的角度，也能达到第一光锥001和第二光锥002光轴方向为水平线向上预设角度的效果。另外，预设倾角既可以是沿水平方向向上倾斜，根据显示系统的实际设置，还可以是水平向下倾斜。当显示系统整体并非水平而是竖直设置时，则可以通过将第一方向或第二方向沿竖直方向偏离预设倾角从而达到第一光锥001和第二光锥002光轴方向也沿竖直方向偏离预设倾角的效果，使得最终照射到空间光调制器40上的光斑弥散程度差异比现有技术小，提高成像质量和画面的显示效果。
本发明的显示系统及显示方法可用于HDR(High-Dynamic Range)高动态对比度数码成像及投影显示技术领域，例如可以作为应用TRP照明的DLP（Digital Light Procession）投影机中。通过在激光器阵列10端和空间光调制器40端同时进行控制，激光光源可高速开关和调制的特点使得每个激光光源都可以实现第一个光电调制器的功能，使得激光器阵列10发射的激光光束在空间光调制器40得到进一步调制，即单独控制每个激光器和与之映射的DMD局部区域从而实现HDR功能，从而出射用以产生更近似期望图像的显示光，显示光投影到屏幕后将带给观看者更好的视觉感受；同时，与现有技术采用两个空间光调制器的设计方案相比，本发明只用到一个空间光调制器，不仅简化了光路结构，也避免了因控制两个空间光调制器容易产生的差错，更加符合用户的利益，同时能够保证画面中最大亮度的区域外的其它暗区域达到足够的暗画面，让暗画面时的画面层次更加细腻丰富，带给观看者更好的视觉感受。并且，本发明解决了传统的显示系统中空间光调制器上的光斑弥散程度差异较大的问题，减小了显示系统成像中的畸变与颜色偏差，亮度和色彩都更加均匀，物象更加近似，提高了成像质量和画面的显示效果，这些问题的解决可以让技术人员实现在DMD工作面内设计更加精细的影射关系，为HDR功能的实现提供更为优质硬件支持。本发明的改进无需增设更多的光学元件或光调制器件，利用与现有技术相当的成本和条件却能达到显著的改进，对于显示系统的研发者、制造者以及用户都具有十分重要的意义。
以上内容是结合具体的实施方式对所作的进一步详细说明，不能认定具体实施只局限于这些说明。对于所属技术领域的普通技术人员来说，在不脱离构思的前提下，还可以做出若干简单推演或替换。

Claims (12)

1.一种显示系统，其特征在于，包括光源装置、光学处理组件、反射装置、光调制器；
所述光源装置用于发射多束光；
所述光学处理组件用于对来自所述光源装置的每一束光进行光路调节从而使其以预设光锥角照射到所述反射装置；
所述反射装置用于将来自所述光学处理组件的光束反射到所述光调制器；
所述光调制器包括多组可控单元，所述反射装置反射的一束光对应于一组可控单元，所述光调制器通过控制该组可控单元中的一个或多个可控单元对该组可控单元所对应的一束光进行调制从而出射符合要求的显示光。
2.如权利要求1所述的显示系统，其特征在于，
所述光源装置包括固态光源阵列，用于发射多束激光，所述固态光源阵列的任一固态光源发射的一束光束对应所述光调制器的一组可控单元。
3.如权利要求2所述的显示系统，其特征在于，
还包括控制器，所述控制器分别与所述光源装置和所述光调制器相连接；
所述控制器用于接收控制信号，根据控制信号控制所述固态光源阵列的某一个固态光源的发光状态，并控制该固态光源对应的该组可控单元中的一个或多个可控单元的调制状态，从而使得所述光调制器对该固态光源发射的光束进行调制并出射符合控制信号期望的显示光。
4.如权利要求1-3任一项所述的显示系统，其特征在于，
所述光学处理组件包括第一中继透镜组、匀光棒单元、第二中继透镜组；
所述第一中继透镜组用于将来自所述光源装置的各光束汇聚到所述匀光棒单元；
所述匀光棒单元用于对来自所述第一中继透镜组的各光束进行匀光处理并出射到所述第二中继透镜组；
所述第二中继透镜组用于调节来自所述匀光棒单元的各光束从而使每一光束以预设光锥角照射到所述反射装置。
5.如权利要求4所述的显示系统，其特征在于，
所述匀光棒单元为矩形匀光棒阵列，所述固态光源阵列的任一光源光源与所述匀光棒阵列中的任一匀光棒一一对应，且该固态光源与该匀光棒对应所述光调制器的一组可控单元。
6.如权利要求4所述的显示系统，其特征在于，
所述预设光锥角的取值范围为16°-34°。
7.如权利要求1-3任一项所述的显示系统，其特征在于，
所述反射装置的设置使得来自所述光学处理组件的光锥形态的光束与所述反射装置的出光面夹角为17°-51°。
8.如权利要求1-3任一项所述的显示系统，其特征在于，
还包括投影屏幕，用于接收来自所述光调制器的显示光从而显示图像。
9.如权利要求4所述的显示系统，其特征在于，
所述光源装置与所述第一中继透镜组之间的中轴线方向为第一方向；
所述第二中继透镜组中各透镜之间的中轴线方向为第二方向；
所述第一方向与所述第二方向具有预设倾角的偏差。
10.如权利要求9所述的显示系统，其特征在于，
所述第一方向与所述第二方向具有2°-3°的偏差。
11.如权利要求9所述的显示系统，其特征在于，
所述第一方向为水平/竖直方向，所述第二方向与水平/竖直方向具有预设倾角的偏差；
或者，所述第二方向为水平/竖直方向，所述第一方向与水平/竖直方向具有预设倾角的偏差。
12. 一种显示方法，其采用如权利要求1-11任一项所述的显示系统，其特征在于，包括：
控制所述固态光源阵列发光并控制每一个固态光源来调制该固态光源发出光束的出光强度；
控制该固态光源对应的一组可控单元中的一个或多个可控单元的翻转角度/时长，从而控制通过该组可控单元的光束的出射光强度。
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US11003064B2 (en) 2021-05-11
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