WO2020042565A1 - 投影系统及其光源模组 - Google Patents

投影系统及其光源模组 Download PDF

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Publication number
WO2020042565A1
WO2020042565A1 PCT/CN2019/076629 CN2019076629W WO2020042565A1 WO 2020042565 A1 WO2020042565 A1 WO 2020042565A1 CN 2019076629 W CN2019076629 W CN 2019076629W WO 2020042565 A1 WO2020042565 A1 WO 2020042565A1
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Prior art keywords
light
laser
array
light source
homogenizer
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PCT/CN2019/076629
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English (en)
French (fr)
Inventor
徐应荣
侯海雄
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • 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]
    • 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]
    • H04N9/3141—Constructional details thereof
    • 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]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • 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]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using 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

Definitions

  • the invention relates to the technical field of projection display, in particular to a projection system and a light source module thereof.
  • the dynamic range of an image refers to the relative ratio between the lightest value and the darkest value of the image.
  • a high dynamic range is beneficial to enhance the contrast of the picture and make the image clearer. Therefore, improving the dynamic range of the image is a development requirement in the current projection display technology field.
  • the projection system uses a spatial light modulator to modulate the light from the light source according to the digital signal of the image, and finally outputs it to the display screen.
  • the spatial light modulator modulates the light beam output of the light source according to the received image digital signal, and modulates the light beam output to be completely shielded when a dark field signal is received.
  • the prior art adds a spatial light modulator before the spatial light modulator to perform two modulations, but this will cause the brightness value of the bright part to pass through the two spatial light modulators. To the loss, the brightest effect cannot be achieved, resulting in a smaller image dynamic range.
  • the present invention provides a projection system with a high dynamic range, including:
  • An image signal processor configured to convert an image digital signal input into the projection system into a light source modulation signal and an image modulation signal, wherein the light source modulation signal is a control signal for controlling the brightness of a light source generated according to an image gray level value ;
  • Light source module light source module, the light source module includes a laser array, a homogenizer array, a light condensing module, and a wavelength conversion device;
  • the laser array includes a plurality of lasers arranged in an array, the lasers are evenly divided into a plurality of laser groups arranged in an array, and each of the laser groups includes at least one of the lasers, and the lasers are used to emit laser light.
  • the light source modulation signal is used to control the laser brightness of each of the laser groups;
  • the light homogenizer array includes a plurality of light homogenizers arranged in an array, and each of the light homogenizers and one laser group
  • the laser light emitted from the laser group is homogenized;
  • the condensing module converges the homogenized laser light and enters the wavelength conversion device;
  • the wavelength conversion device can convert the laser light into fluorescence;
  • a spatial light modulator that modulates the laser light and the fluorescence emitted from the wavelength conversion device according to the image modulation signal to generate image light.
  • the light source module further includes a collimating lens array
  • the collimating lens array includes a plurality of collimating lenses arranged in an array, each of the collimating lenses corresponding to one of the lasers, Collimating the laser light emitted from the laser; the collimating lens array is located in an optical path between the laser array and the homogenizer array, or the homogenizer array is located in the laser In the optical path between the array and the collimating lens array.
  • the light-concentrating module includes a first light-condensing lens, a light-guiding device, and a collection lens group disposed along a light path, the laser light is focused on the light-guiding device through the first light-condensing lens, and Guided by the light guide device into the collection lens group, the laser light is collected through the collection lens group and incident on the wavelength conversion device.
  • the light source module further includes a second condenser lens, and the laser light and the fluorescence emitted from the wavelength conversion device are emitted by the collection lens group and the light guide device, and then emitted by the light collection device.
  • the second condenser lens is focused into the spatial light modulator.
  • the light homogenizer is a light homogenizing rod or a fly-eye lens.
  • the invention also provides a light source module with a high dynamic range, including a laser array, a homogenizer array, a light condensing module, and a wavelength conversion device;
  • the laser array includes a plurality of lasers arranged in an array, and the lasers are uniform Divided into a plurality of laser groups arranged in an array, each said laser group includes at least one said laser, said laser is used for emitting laser light;
  • said homogenizer array comprises a plurality of homogenizers arranged in an array Each of the light homogenizers corresponds to a laser group, and homogenizes the laser light emitted from the laser group;
  • the light condensing module condenses the homogenized laser light and enters the wavelength conversion device;
  • the wavelength conversion device is capable of converting the laser light into fluorescence.
  • the light source module further includes a collimating lens array
  • the collimating lens array includes a plurality of collimating lenses arranged in an array, each of the collimating lenses corresponding to one of the lasers, Collimating the laser light emitted from the laser; the collimating lens array is located in an optical path between the laser array and the homogenizer array, or the homogenizer array is located in the laser In the optical path between the array and the collimating lens array.
  • the light-concentrating module includes a first light-condensing lens, a light-guiding device, and a collection lens group disposed along a light path, the laser light is focused on the light-guiding device through the first light-condensing lens, and Guided by the light guide device into the collection lens group, the laser light is collected through the collection lens group and incident on the wavelength conversion device.
  • the number of the lasers in each of the laser groups is one, the light homogenizer and the lasers are distributed in a one-to-one correspondence, and the laser light emitted by each of the lasers is corresponding to one of the lasers.
  • the homogenizer performs homogenization.
  • the light homogenizer is a light homogenizing rod or a fly-eye lens.
  • the projection system provided by the present invention can convert an image digital signal into two signals: a light source modulation signal and an image modulation signal, and respectively control the light source module and the spatial light modulator, wherein the light source modulation signal controls the light source mode.
  • the brightness of the laser generated by the group and the image modulation signal control the spatial light modulator to modulate the laser and fluorescence emitted from the light source module. Therefore, the primary conversion of the grayscale of the picture that is reduced and brightened by the light source modulation signal to the light source module is compared to the simple use of a spatial light modulator for modulation, which does not cause energy loss, lower costs, and achieves The purpose is to improve the dynamic range of the image.
  • the laser spot, the homogenizer array, and the collimating lens array make the light spot formed on the wavelength conversion device to be an array light spot composed of multiple small light spots.
  • Each small light spot is independently controlled by a corresponding laser to achieve a small area in the light source. Light intensity controllable purpose.
  • FIG. 1 is a principle block diagram of a projection system provided by the present invention.
  • FIG. 2 is a schematic structural diagram of a projection system according to a preferred embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a projection system according to another preferred embodiment of the present invention.
  • Wavelength conversion device 125 Wavelength conversion device 125
  • FIG. 1 is a schematic block diagram of a projection system 100 provided by the present invention.
  • the projection system 100 includes an image signal processor 110, a light source module 120, a spatial light modulator 130, and a lens 140.
  • the image digital signal received by the projection system 100 is calculated by the image signal processor 110 and converted into a light source modulation signal I 1 input to the light source module 120 and an image modulation signal output to the spatial light modulator 130.
  • I 2 The light source module 120 is configured to emit laser light and control the brightness of the laser light according to the light source modulation signal I 1 , and perform wavelength conversion after the laser light is homogenized, collimated, focused, and collected. Fluorescent.
  • the spatial light modulator 130 modulates the laser light and the fluorescence emitted by the light source module 120 according to the image modulation signal I 2 to generate image light.
  • the lens 140 receives the image light and projects the image light to a predetermined position or a predetermined element (such as a projection screen, a wall, etc.) to display an image.
  • the working principle of the projection system 100 is that the light source modulation signal I 1 is a control signal for controlling the brightness of the laser light generated according to the grayscale value of the image.
  • the control signal may be a current signal, a voltage signal, etc. It is a current signal.
  • the light source module 120 controls the brightness of the laser light emitted by the light source according to the magnitude of the current, that is, controls the light emitting efficiency according to the magnitude of the current, and makes the brightness of the laser light follow the current.
  • the laser light intensity is increased, so that the laser light intensity is controllable.
  • the projection system 100 can not only control the spatial light modulator 130 to modulate the laser light and the fluorescence emitted by the light source module 120 through the image modulation signal I 2 , but also according to the image digital signal
  • the light source modulation signal I 1 is converted to control the brightness of the laser light generated by the light source module 120. Therefore, the light source module 120 realizes the primary conversion of the gray scale of the picture with reduced lightening and brightening through the light source modulation signal I 1.
  • it will not cause Energy loss, lower costs, and at the same time achieve the purpose of increasing the dynamic range of the image.
  • the light source module 120 includes a laser array 121, a homogenizer array 122, a collimating lens array 123, a light condensing module 124, and a wavelength conversion device 125.
  • the laser array 121 emits the laser light, and the laser light enters the collimator lens array 123 for collimation processing after being homogenized by the light homogenizer array 122, and then the laser light passes through the condensing module.
  • 124 is collected and incident on the wavelength conversion device 125 and excited to generate the fluorescence.
  • the wavelength conversion device 125 is covered with phosphor powder, and the laser light incident on the phosphor powder area of the wavelength conversion device 125 excites the phosphor to generate the fluorescence, and the light incident on the wavelength conversion device 125 The laser light in the non-phosphor area may be directly reflected. Therefore, the light emitted from the wavelength conversion device 125 is a mixed light of the laser light and the fluorescence.
  • the laser array 121 includes a plurality of lasers 1211 arranged in an array.
  • the laser 1211 is specifically a laser diode, and can provide outgoing light with high energy density and small divergence angle.
  • the light homogenizer array 122 includes a plurality of light homogenizers 1221 arranged in an array.
  • the light homogenizer 1221 may be a light uniform rod.
  • the light entrance of the light uniform rod and The light outlets are all square, and the aspect ratio can be designed as required.
  • the light homogenizer 1221 may also be a fly-eye lens.
  • the collimating lens array 123 includes a plurality of collimating lenses 1231 arranged in an array.
  • the collimating lens 1231 is needed to improve the collimation of the light beam.
  • the plurality of lasers 1211 included in the laser array 121 are evenly divided into a plurality of laser groups arranged in an array, each laser group includes at least one of the lasers 1211, and the light source modulation signal I 1 is used to control each A laser brightness of the laser group.
  • the number of the light homogenizers 1221 is equal to the number of the laser groups, and each of the light homogenizers 1221 corresponds to one of the laser groups to homogenize the laser light emitted from the laser groups.
  • the laser array 121 includes 16 lasers 1211 arranged in a 4 ⁇ 4 array, and each 4 of the lasers 1211 arranged in a 2 ⁇ 2 array is divided into a laser group.
  • the lasers emitted by the four lasers 1211 correspond to the same light homogenizer 1221 to perform light homogenization.
  • the number of the lasers 1211 in each laser group is one, that is, the number of the light homogenizers 1221 is equal to the number of the lasers 1211 and is distributed in a one-to-one correspondence with the lasers 1211, so that each light is uniform
  • the processor 1221 only performs light homogenization processing on the laser light corresponding to one of the lasers 1211 to improve the light homogenization effect.
  • the number of the collimating lenses 1231 is equal to the number of the lasers 1211 and is distributed in one-to-one correspondence with the lasers 1211, so that the light emitted by each laser 1211 enters a corresponding collimating lens 1231 to improve the collimation of the light beam.
  • the light homogenizer array 122 is disposed in the optical path between the laser array 121 and the collimating lens array 123, and the laser light emitted by each laser 1211 passes through the corresponding light homogenizer 1221 first. Perform uniform light processing, and then perform collimation processing corresponding to a collimating lens 1231.
  • the light-concentrating module 124 includes a first light-condensing lens 1241, a light-guiding device 1242, and a collection lens group 1243, which are arranged according to an optical path. It can be understood that, because the area of the light beam emitted by the laser array 121 is large, the cross-sectional area of the light beam can be compressed by the light condensing module 124 to facilitate subsequent processing of the optical element.
  • the light guiding device 1242 is an area.
  • a diaphragm including a reflection region and a transmission region the laser light emitted by each laser 1211 enters the first condenser lens 1241 in parallel after being homogenized and collimated, and from the first After exiting the condenser lens 1241, it focuses on the reflection area of the light guide device 1242, and then enters the collection lens group 1243 through the reflection of the light guide device 1242, and finally collects the light incident on the wavelength conversion device 125 to excite the light. Mentioned fluorescence.
  • the light spot formed on the wavelength conversion device 125 is an array light spot composed of a plurality of small light spots, and each small light spot is independently controlled by a corresponding laser 1211, so as to achieve the purpose of controlling the light intensity of a small area in the light source.
  • the light source module 120 further includes a second condenser lens 126, and the laser light and the fluorescence emitted from the wavelength conversion device 125 are transmitted through the collection lens group 1243 and the light guide device 1242. After the transmission in the area, the light enters the second condenser lens 126 in parallel, so that the laser light and the fluorescence are focused into the spatial light modulator 130 for modulation.
  • the spatial light modulator 130 may be a DMD (Digital Micromirror Device), an LCD (Liquid Crystal Display), or the like.
  • FIG. 3 is a schematic structural diagram of a projection system 100 according to another preferred embodiment of the present invention.
  • the projection system 100 shown in FIG. 3 is substantially the same as the projection system 100 shown in FIG. 2.
  • the collimating lens array 123 is disposed between the laser array 121 and the homogenizer array 122.
  • the laser light emitted by each laser 1211 is subjected to a collimation process corresponding to a collimating lens 1231 and then subjected to a homogenization process by a corresponding homogenizer 1221.
  • the laser light is subjected to a collimation process and then a light homogenization process is performed, which can reduce the processing difficulty of the laser array 121 and the light homogenizer array 122.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

本发明涉及一种投影系统及其光源模组。投影系统包括图像信号处理器、光源模组及空间光调制器，图像信号处理器将图像数字信号转化为光源调制信号与图像调制信号；光源模组包括激光器阵列、匀光器阵列、聚光模块及波长转换装置；激光器阵列包括呈阵列排布的多个激光器，激光器均匀划分为呈阵列排布的多个激光器组，光源调制信号用于控制每一激光器组的激光亮度；匀光器阵列包括呈阵列排布的多个匀光器，每个匀光器与一激光器组对应，将激光器组出射的激光进行匀光；聚光模块将均匀化后的激光汇聚并入射至波长转换装置；波长转换装置能够将激光转换为荧光；空间光调制器根据图像调制信号调制自波长转换装置出射的激光及荧光以产生图像光。

Description

投影系统及其光源模组 技术领域
本发明涉及投影显示技术领域，尤其涉及一种投影系统及其光源模组。
背景技术
图像的动态范围是指图像最亮值与最暗值的相对比值，高的动态范围有利于增强画面对比度，使图像更清晰，因此，提高图像动态范围是当前投影显示技术领域的发展需求。
目前，投影系统是通过空间光调制器根据图像数字信号调制来自光源的光，最后输出到显示屏上。实际应用过程中，空间光调制器根据接收的图像数字信号来调制光源的光束输出，并在接收到暗场信号时将光束输出调制为完全屏蔽。尽管实现了最暗值时无光束输出，但是由于照射到空间光调制器的光束处于盈余的状态，还是会有光束从缝隙中泄露出去，导致显示屏达不到最暗效果，不仅使得投影系统效率低，还造成了高能耗。
为了提高暗色阶时的表现力，现有技术在空间光调制器之前再加上一个空间光调制器进行两次调制，但这样会使得明亮部分在通过两个空间光调制器后的亮度值遭到损失，达不到最明亮的效果，导致图像动态范围较小。
发明内容
为解决现有投影系统显示的图像动态范围小的技术问题，本发明提供一种具备高动态范围的投影系统，包括：
图像信号处理器，用于将输入所述投影系统的图像数字信号转化为光源调制信号与图像调制信号，其中，所述光源调制信号是根据图像的灰阶值生成的控制光源光亮度的控制信号；
光源模组，光源模组，所述光源模组包括激光器阵列、匀光器阵列、聚光模块及波长转换装置；
所述激光器阵列包括呈阵列排布的多个激光器，所述激光器均匀划分为呈阵列排布的多个激光器组，每一所述激光器组包括至少一个所述激光器，所述激光器用于出射激光，所述光源调制信号用于控制每一所述激光器组的激光亮度；所述匀光器阵列包括呈阵列排布的多个匀光器，每个所述匀光器与一所述激光器组对应，将所述激光器组出射的激光进行匀光；所述聚光模块将均匀化后的激光汇聚并入射至所述波长转换装置；所述波长转换装置能够将所述激光转换为荧光；
空间光调制器，所述空间光调制器根据所述图像调制信号调制自所述波长转换装置出射的所述激光及所述荧光以产生图像光。
在一个实施方式中，所述光源模组还包括准直透镜阵列，所述准直透镜阵列包括呈阵列排布的多个准直透镜，每个所述准直透镜与一个所述激光器对应，将所述激光器出射的所述激光进行准直化处理；所述准直透镜阵列位于所述激光器阵列与所述匀光器阵列之间的光路中，或者所述匀光器阵列位于所述激光器阵列与所述准直透镜阵列之间的光路中。
在一个实施方式中，所述聚光模块包括依光路设置的第一聚光透镜、光引导装置及收集透镜组，所述激光通过所述第一聚光透镜聚焦于所述光引导装置，并由所述光引导装置引导进入所述收集透镜组，所述激光经过所述收集透镜组收集入射至所述波长转换装置。
在一个实施方式中，所述光源模组还包括第二聚光透镜，自所述波长转换装置出射的所述激光及所述荧光通过所述收集透镜组及所述光引导装置出射之后被所述第二聚光透镜聚焦进入所述空间光调制器中。
在一个实施方式中，所述匀光器为匀光棒或者复眼透镜。
本发明还提供一种具备高动态范围的光源模组，包括激光器阵列、匀光器阵列、聚光模块及波长转换装置；所述激光器阵列包括呈阵列排布的多个激光器，所述激光器均匀划分为呈阵列排布的多个激光器组，每一所述激光器组包括至少一个所述激光器，所述激光器用于出射激光；所述匀光器阵列包括呈阵列排布的多个匀光器，每个所述匀光器与一所述激光器组对应，将所述激光器组出射的激光进行匀光；所述聚光模块将均匀化后的激光汇聚并入射至所述波长转换装置；所述波长转换装置能够将所述激光转换为荧光。
在一个实施方式中，所述光源模组还包括准直透镜阵列，所述准直透镜阵列包括呈阵列排布的多个准直透镜，每个所述准直透镜与一个所述激光器对应，将所述激光器出射的所述激光进行准直化处理；所述准直透镜阵列位于所述激光器阵列与所述匀光器阵列之间的光路中，或者所述匀光器阵列位于所述激光器阵列与所述准直透镜阵列之间的光路中。
在一个实施方式中，所述聚光模块包括依光路设置的第一聚光透镜、光引导装置及收集透镜组，所述激光通过所述第一聚光透镜聚焦于所述光引导装置，并由所述光引导装置引导进入所述收集透镜组，所述激光经过所述收集透镜组收集入射至所述波长转换装置。
在一个实施方式中，每一所述激光器组中所述激光器的数量为一个，所述匀光器与所述激光器一一对应分布，每个所述激光器发 出的所述激光被对应一个所述匀光器进行匀光处理。
在一个实施方式中，所述匀光器为匀光棒或者复眼透镜。
与现有技术相比较，本发明提供的投影系统能够将图像数字信号转化为两路信号：光源调制信号与图像调制信号，分别控制光源模块和空间光调制器，其中，光源调制信号控制光源模组产生的激光的亮度，图像调制信号控制空间光调制器对光源模组出射的激光和荧光进行调制。因此，通过光源调制信号对光源模组实现减暗增亮的画面灰阶的初级转换，相比于简单的使用空间光调制器来进行调制，不会造成能量损失、使成本更低，同时实现了提升图像动态范围的目的。另外，通过激光器阵列、匀光器阵列及准直透镜阵列使得波长转换装置上形成的光斑是多个小光斑组成的阵列光斑，每个小光斑由对应一个激光器独立控制，以此达到光源中小区域光强可控的目的。
附图说明
图1是本发明提供的投影系统的原理框图。
图2是本发明一较佳实施方式的投影系统的结构示意图。
图3是本发明另一较佳实施方式的投影系统的结构示意图。
主要元件符号说明
投影系统          100
图像信号处理器    110
光源模组          120
空间光调制器      130
镜头              140
激光器阵列        121
匀光器阵列        122
准直透镜阵列      123
聚光模块          124
波长转换装置      125
激光器            1211
匀光器            1221
准直透镜          1231
第一聚光透镜      1241
光引导装置        1242
收集透镜组        1243
第二聚光透镜      126
光源调制信号      I 1
图像调制信号      I 2
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
请参阅图1，图1是本发明提供的投影系统100的原理框图。所述投影系统100包括图像信号处理器110、光源模组120、空间光调制器130、及镜头140。所述投影系统100接收的图像数字信号经所述图像信号处理器110计算，转化为输向所述光源模组120的光源调制信号I 1及输向所述空间光调制器130的图像调制信号I 2。所述光源模组120用于发出激光并依据所述光源调制信号I 1控制所述激光的光亮度，并在对所述激光进行匀光、准直化、聚焦及 收集处理后进行波长转换产生荧光。所述空间光调制器130根据所述图像调制信号I 2调制所述光源模组120出射的所述激光与所述荧光以产生图像光。所述镜头140接收所述图像光并将所述图像光投影至预定位置或预定元件(如投影屏幕、墙壁等)来显示图像。
所述投影系统100的工作原理在于：所述光源调制信号I 1是根据图像的灰阶值生成的控制所述激光光亮度的控制信号，所述控制信号可以为电流信号、电压信号等，优选为电流信号，所述光源模组120根据电流的大小控制其发出的所述激光的光亮度，即根据所述电流的大小控制其发光效率，并且使所述激光的光亮度随着所述电流的增大而增大，从而实现所述激光的光强度可控。
与现有技术相比较，所述投影系统100不仅能够通过所述图像调制信号I 2控制所述空间光调制器130对所述光源模组120出射的激光与荧光进行调制，还根据图像数字信号转化出所述光源调制信号I 1以控制所述光源模组120产生的所述激光的光亮度。因此，通过所述光源调制信号I 1对所述光源模组120实现减暗增亮的画面灰阶的初级转换，相比于简单的使用所述空间光调制器130来进行调制，不会造成能量损失、使成本更低，同时达到提升图像动态范围的目的。
请参阅图2，图2是本发明一较佳实施方式的投影系统100的结构示意图。所述光源模组120包括激光器阵列121、匀光器阵列122、准直透镜阵列123、聚光模块124、及波长转换装置125。所述激光器阵列121发出所述激光，所述激光受到所述匀光器阵列122的匀光处理后进入所述准直透镜阵列123进行准直化处理，接着所述激光经所述聚光模块124收集后入射至所述波长转换装置125并激发产生所述荧光。
可以理解，所述波长转换装置125的部分区域覆盖有荧光粉， 入射至所述波长转换装置125的荧光粉区域的所述激光激发荧光粉产生所述荧光，入射至所述波长转换装置125的非荧光粉区域的所述激光可被直接反射。因此，所述波长转换装置125的出射光为所述激光与所述荧光的混合光。
所述激光器阵列121包括呈阵列排布的多个激光器1211，本实施方式中，所述激光器1211具体为激光二极管，能够提供能量密度高、发散角度小的出射光。所述匀光器阵列122包括呈阵列排布的多个匀光器1221，具体地，所述匀光器1221可以是匀光棒，本实施例中，所述匀光棒的入光口和出光口均为方形，其长宽比可以根据需要进行设计。进一步地，所述匀光器1221还可以是复眼透镜。所述准直透镜阵列123包括呈阵列排布的多个准直透镜1231，需要说明的是，虽然所述激光器1211的出射光发散角度小，但是在传播过程中会扩大光束截面积而降低亮度，因此需要所述准直透镜1231来提高光束的准直性。
具体地，所述激光器阵列121包括的多个激光器1211均匀划分为呈阵列排布的多个激光器组，每个激光器组包括至少一个所述激光器1211，所述光源调制信号I 1用于控制每一所述激光器组的激光亮度。所述匀光器1221的数量相等于所述激光器组的数量，每个所述匀光器1221与一所述激光器组对应将所述激光器组出射的激光进行匀光。例如，所述激光器阵列121包括16个按照4×4阵列排布的所述激光器1211，将每4个按照2×2阵列排布的所述激光器1211划分为一个激光器组，每个激光器组中的4个所述激光器1211发出的所述激光对应于同一个所述匀光器1221进行匀光处理。优选地，每个激光器组中所述激光器1211的数量为一个，即所述匀光器1221的数量相等于所述激光器1211的数量并与所述激光器1211一一对应分布，使每个匀光器1221仅为对应一个所述 激光器1211产生的所述激光进行匀光处理，以提高匀光效果。
所述准直透镜1231的数量相等于所述激光器1211的数量并与所述激光器1211一一对应分布，使每个激光器1211的出射光进入对应一个准直透镜1231以提高光束的准直性。本实施方式中，所述匀光器阵列122设置于所述激光器阵列121与所述准直透镜阵列123之间的光路中，每个激光器1211发出的所述激光先经过对应的匀光器1221进行匀光处理，之后经过对应一个准直透镜1231进行准直化处理。
所述聚光模块124包括依光路设置的第一聚光透镜1241、光引导装置1242、及收集透镜组1243。可以理解，由于所述激光器阵列121的出射光光束面积很大，采用所述聚光模块124能够压缩光束截面积以便于后续光学元件的处理，本实施方式中，所述光引导装置1242为区域膜片，所述区域膜片包括反射区及透射区，每个激光器1211发出的所述激光经过匀光及准直化处理后平行进入所述第一聚光透镜1241，并自所述第一聚光透镜1241出射后聚焦到所述光引导装置1242的反射区，然后经过所述光引导装置1242的反射进入所述收集透镜组1243，最后收集入射至所述波长转换装置125以激发产生所述荧光。值得注意的是，所述波长转换装置125上形成的光斑是多个小光斑组成的阵列光斑，每个小光斑由对应一个激光器1211独立控制，以此达到光源中小区域光强可控的目的。
进一步地，所述光源模组120还包括第二聚光透镜126，自所述波长转换装置125出射的所述激光与所述荧光经过所述收集透镜组1243及所述光引导装置1242的透射区的透射后平行进入所述第二聚光透镜126，使得所述激光与所述荧光聚焦后进入所述空间光调制器130进行调制。需要说明的是，所述空间光调制器130可 以是DMD(Digital Micromirror Device)、LCD(Liquid Crystal Display)等。
请参阅图3，图3是本发明另一较佳实施方式的投影系统100的结构示意图。图3所示的投影系统100与图2所示的投影系统100大致相同，其不同之处在于：所述准直透镜阵列123设置于所述激光器阵列121与所述匀光器阵列122之间的光路中，每个激光器1211发出的所述激光经过对应一个准直透镜1231的准直化处理之后再经过对应的匀光器1221的匀光处理。实际加工过程中，对所述激光进行准直化处理之后再进行匀光处理，能够降低所述激光器阵列121与所述匀光器阵列122的加工难度。
以上仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其它相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

  1. 一种投影系统，其特征在于，包括：
    图像信号处理器，用于将输入所述投影系统的图像数字信号转化为光源调制信号与图像调制信号，其中，所述光源调制信号是根据图像的灰阶值生成的控制光源光亮度的控制信号；
    光源模组，所述光源模组包括激光器阵列、匀光器阵列、聚光模块及波长转换装置；
    所述激光器阵列包括呈阵列排布的多个激光器，所述激光器均匀划分为呈阵列排布的多个激光器组，每一所述激光器组包括至少一个所述激光器，所述激光器用于出射激光，所述光源调制信号用于控制每一所述激光器组的激光亮度；所述匀光器阵列包括呈阵列排布的多个匀光器，每个所述匀光器与一所述激光器组对应，将所述激光器组出射的激光进行匀光；所述聚光模块将均匀化后的激光汇聚并入射至所述波长转换装置；所述波长转换装置能够将所述激光转换为荧光；
    空间光调制器，所述空间光调制器根据所述图像调制信号调制自所述波长转换装置出射的所述激光及所述荧光以产生图像光。
  2. 如权利要求1所述的投影系统，其特征在于，所述光源模组还包括准直透镜阵列，所述准直透镜阵列包括呈阵列排布的多个准直透镜，每个所述准直透镜与一个所述激光器对应，将所述激光器出射的所述激光进行准直化处理；所述准直透镜阵列位于所述激光器阵列与所述匀光器阵列之间的光路中，或者所述匀光器阵列位于所述激光器阵列与所述准直透镜阵列之间的光路中。
  3. 如权利要求1所述的投影系统，其特征在于，所述聚光模块包括依光路设置的第一聚光透镜、光引导装置及收集透镜组，所述激光通过所述第一聚光透镜聚焦于所述光引导装置，并由所述光引 导装置引导进入所述收集透镜组，所述激光经过所述收集透镜组收集入射至所述波长转换装置。
  4. 如权利要求3所述的投影系统，其特征在于，所述光源模组还包括第二聚光透镜，自所述波长转换装置出射的所述激光及所述荧光通过所述收集透镜组及所述光引导装置出射之后被所述第二聚光透镜聚焦进入所述空间光调制器中。
  5. 如权利要求1-4任一项所述的投影系统，其特征在于，所述匀光器为匀光棒或者复眼透镜。
  6. 一种光源模组，其特征在于，包括激光器阵列、匀光器阵列、聚光模块及波长转换装置；所述激光器阵列包括呈阵列排布的多个激光器，所述激光器均匀划分为呈阵列排布的多个激光器组，每一所述激光器组包括至少一个所述激光器，所述激光器用于出射激光；所述匀光器阵列包括呈阵列排布的多个匀光器，每个所述匀光器与一所述激光器组对应，将所述激光器组出射的激光进行匀光；所述聚光模块将均匀化后的激光汇聚并入射至所述波长转换装置；所述波长转换装置能够将所述激光转换为荧光。
  7. 如权利要求6所述的光源模组，其特征在于，所述光源模组还包括准直透镜阵列，所述准直透镜阵列包括呈阵列排布的多个准直透镜，每个所述准直透镜与一个所述激光器对应，将所述激光器出射的所述激光进行准直化处理；所述准直透镜阵列位于所述激光器阵列与所述匀光器阵列之间的光路中，或者所述匀光器阵列位于所述激光器阵列与所述准直透镜阵列之间的光路中。
  8. 如权利要求6所述的光源模组，其特征在于，所述聚光模块包括依光路设置的第一聚光透镜、光引导装置及收集透镜组，所述激光通过所述第一聚光透镜聚焦于所述光引导装置，并由所述光引导装置引导进入所述收集透镜组，所述激光经过所述收集透镜组收 集入射至所述波长转换装置。
  9. 如权利要求6所述的光源模组，其特征在于，每一所述激光器组中所述激光器的数量为一个，所述匀光器与所述激光器一一对应分布，每个所述激光器发出的所述激光被对应一个所述匀光器进行匀光处理。
  10. 如权利要求6-9任一项所述的光源模组，其特征在于，所述匀光器为匀光棒或者复眼透镜。
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