基于LcoS的激光背投电视的光机设计
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摘要
激光具有单色性好、方向性好、亮度高等特点。采用三基色激光光源的激光显示色域范围大、色纯度与饱和度高,所显示的图像颜色更丰富鲜艳、更接近于自然色彩。近年来,体积小、功率高、性能稳定的三基色激光光源的发展十分迅速,且价格在不断降低,大大推进了激光显示技术的研究和应用进程。激光显示技术应用领域广泛、市场巨大。
本文以基于LCoS的激光投影显示光学引擎的结构与实验研究为主要研究内容。具体包括以下内容：(1)结合色度学和光度学理论,分析了三基色激光光源波长对显示色域大小的影响,给出了激光投影显示中三基色激光光源波长的选择原则；根据所选用三基色激光光源的波长及显示画面大小,并考虑到光学系统的光能损失,计算了三基色激光光源的功率配比和所需要的具体功率。(2)对传统投影显示中已有的多种光学引擎结构进行了分析比较,结合激光光源的特点及所选用三基色激光光源的性能参数,从提高光能利用率及对比度等方面考虑,最终确定了采用三片式LCoS的光学引擎作结构；并对系统中所用偏振光学器件(偏振分束镜、四分之一波片等)的作用、使用方式及其对显示对比度的影响进行了分析。(3)以标量衍射理论为基础分析了适于激光匀光整形的相位型衍射光束整形器件的原理,介绍了相位型衍射光束整形器件的各种设计算法及评估函数,并给出了部分算法的计算机模拟结果；给出了相位型衍射光束整形器件的三种使用方法,并进行了实验验证。(4)对激光显示所特有的激光散斑和背景条纹进行了理论分析,在介绍现有降低激光散斑的各种方案的基础上,提出了三种新的降低激光散斑效应的方案,还提出了可同时实现光束整形和消散斑的一体化装置的两种方案。(5)对激光投影显示光学引擎的整体光学系统进行了初步的建模分析,对部分单元(如蓝光、绿光的扩束准直系统,光束整形系统,红光的聚光系统等)进行了计算机模拟与设计,确定了系统中各元器件的参数及系统结构参数；构建了采用三片LCoS的激光投影显示光学引擎的实验系统,并进行了实验研究,对显示图像的光度及色度参数指标进行了初步实验测量,实验结果验证了整体方案的可行性。
Tricolor laser display has a wider color gamut, higher color purity and saturation, and the images' color shown by it is more plentiful, more vibrant, and closer to the natural colors because the laser's better monochromeaticity, better directivity, and higher brightness. That tricolor laser with small size, high power, and stable performance is developing rapidly, and its prices is also becoming lower and lower advanced the research and application process of laser display technology. Laser display technology has widespread applications fields and huge market.
The main topic of this paper is the structure and experimental research about the optical engine of laser projection display based on LCoS. Specifically, include the following five sections:(1) The influence of tricolor laser wavelengths on the size of display color gamut is analyzed, the selecting principles of tricolor laser wavelengths is given with the help of color Principles and photometry theory, and the power ratio the specific power of tricolor laser is calculated according to the tricolor laser wavelength selected, display screen size, and the light loss of the optical system is also taken into account. (2) After analyzing and comparing different kinds of traditional projection display optical engine structures, three-chip LCoS optical engine structure is finally determined, combing many considerations such as the characteristics of laser source and the Tricolor laser's performance parameters, the light use efficiency and the contrast, and other considerations. The use methods, and impact of the polarized optics devices (for example polarizing beam splitter, a quarter wave plate, etc.) used in systems on contrast are also analyzed. (3) This paper analysis the principle of the phase-type diffraction beam shaping devices suitable for laser beam shaping according the scalar diffraction theory, introduces various design algorithms of it and its evaluation functions, gives computer simulation results of some algorithms, three using methods of it and its experimental validation are also given. (4) This paper gives the theoretical analysis about laser speckle and background stripes that comes out only in the laser display, proposes three new programs to reduce laser speckle and two programs of integrated device that can realize laser beam shaping and speckle removing simultaneously after describing existing different programs to reduce laser speckle. (5) This paper gives a preliminary modeling analysis of the whole optical system of the laser projection display engine. Some elements are designed and simulated by computer. The parameters of each component and the whole system are determined. The experimental system using three-chip LCoS for laser projection display is constructed, and many experimental researches have also been done. At last, this paper gives a preliminary experimental measurement about the brightness and color parameter index of the image shown, the experimental results verified the feasibility of the overall program.
本文以基于LCoS的激光投影显示光学引擎的结构与实验研究为主要研究内容。具体包括以下内容：(1)结合色度学和光度学理论,分析了三基色激光光源波长对显示色域大小的影响,给出了激光投影显示中三基色激光光源波长的选择原则；根据所选用三基色激光光源的波长及显示画面大小,并考虑到光学系统的光能损失,计算了三基色激光光源的功率配比和所需要的具体功率。(2)对传统投影显示中已有的多种光学引擎结构进行了分析比较,结合激光光源的特点及所选用三基色激光光源的性能参数,从提高光能利用率及对比度等方面考虑,最终确定了采用三片式LCoS的光学引擎作结构；并对系统中所用偏振光学器件(偏振分束镜、四分之一波片等)的作用、使用方式及其对显示对比度的影响进行了分析。(3)以标量衍射理论为基础分析了适于激光匀光整形的相位型衍射光束整形器件的原理,介绍了相位型衍射光束整形器件的各种设计算法及评估函数,并给出了部分算法的计算机模拟结果；给出了相位型衍射光束整形器件的三种使用方法,并进行了实验验证。(4)对激光显示所特有的激光散斑和背景条纹进行了理论分析,在介绍现有降低激光散斑的各种方案的基础上,提出了三种新的降低激光散斑效应的方案,还提出了可同时实现光束整形和消散斑的一体化装置的两种方案。(5)对激光投影显示光学引擎的整体光学系统进行了初步的建模分析,对部分单元(如蓝光、绿光的扩束准直系统,光束整形系统,红光的聚光系统等)进行了计算机模拟与设计,确定了系统中各元器件的参数及系统结构参数；构建了采用三片LCoS的激光投影显示光学引擎的实验系统,并进行了实验研究,对显示图像的光度及色度参数指标进行了初步实验测量,实验结果验证了整体方案的可行性。
Tricolor laser display has a wider color gamut, higher color purity and saturation, and the images' color shown by it is more plentiful, more vibrant, and closer to the natural colors because the laser's better monochromeaticity, better directivity, and higher brightness. That tricolor laser with small size, high power, and stable performance is developing rapidly, and its prices is also becoming lower and lower advanced the research and application process of laser display technology. Laser display technology has widespread applications fields and huge market.
The main topic of this paper is the structure and experimental research about the optical engine of laser projection display based on LCoS. Specifically, include the following five sections:(1) The influence of tricolor laser wavelengths on the size of display color gamut is analyzed, the selecting principles of tricolor laser wavelengths is given with the help of color Principles and photometry theory, and the power ratio the specific power of tricolor laser is calculated according to the tricolor laser wavelength selected, display screen size, and the light loss of the optical system is also taken into account. (2) After analyzing and comparing different kinds of traditional projection display optical engine structures, three-chip LCoS optical engine structure is finally determined, combing many considerations such as the characteristics of laser source and the Tricolor laser's performance parameters, the light use efficiency and the contrast, and other considerations. The use methods, and impact of the polarized optics devices (for example polarizing beam splitter, a quarter wave plate, etc.) used in systems on contrast are also analyzed. (3) This paper analysis the principle of the phase-type diffraction beam shaping devices suitable for laser beam shaping according the scalar diffraction theory, introduces various design algorithms of it and its evaluation functions, gives computer simulation results of some algorithms, three using methods of it and its experimental validation are also given. (4) This paper gives the theoretical analysis about laser speckle and background stripes that comes out only in the laser display, proposes three new programs to reduce laser speckle and two programs of integrated device that can realize laser beam shaping and speckle removing simultaneously after describing existing different programs to reduce laser speckle. (5) This paper gives a preliminary modeling analysis of the whole optical system of the laser projection display engine. Some elements are designed and simulated by computer. The parameters of each component and the whole system are determined. The experimental system using three-chip LCoS for laser projection display is constructed, and many experimental researches have also been done. At last, this paper gives a preliminary experimental measurement about the brightness and color parameter index of the image shown, the experimental results verified the feasibility of the overall program.
引文
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