Laser & Optoelectronics Progress, Volume. 62, Issue 8, 0811002(2025)

Dynamic Laser Illumination for Silicon-Based Liquid-Crystal Projection System

Hongxin Li1,2、*, Xianpeng Zhang2, and Yatao Yang1
Author Affiliations
  • 1College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, Guangdong , China
  • 2Appotronics Corporation Limited, Shenzhen 518052, Guangdong , China
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    Figures & Tables(14)
    LCoS projection system architecture based on dynamic laser illumination
    Angular distribution of light intensity after laser passes through diffuser
    Scanning trajectory of laser beam
    Y-axis light intensity uniformity at different scan line spacing
    Y-axis light intensity distribution at different scan line spacings. (a) 2.0°; (b) 1.5°
    Area division for dynamic laser illumination
    Distribution of laser intensity for a single sub-area or full illumination on. (a) Single sub-area; (b) full illumination
    Calculation process diagram of dynamic laser illumination algorithm
    Backlight intensity distribution, image correction grayscale, and final display quality in different scenes. (a)‒(c) Original images; (d)‒(f) backlight distribution; (g)‒(i) image grayscale correction; (j)‒(l) display images
    Number of grayscale errors in different scenarios. (a) Text display; (b) picture display
    Backlight intensity distribution and final display quality under different backlight ranges. (a)‒(c) Backlight distribution; (d)‒(f) display images
    Performance comparison of different technologies
    • Table 1. Lighting power ratio under different backlight ranges and display images

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      Table 1. Lighting power ratio under different backlight ranges and display images

      Backlight range /(°)Lighting power ratio η/%
      Image 1Image 2Image 3
      1.06.716.030.5
      1.57.821.535.8
      2.011.124.840.0
    • Table 2. Comparison of other technologies and proposed technology

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      Table 2. Comparison of other technologies and proposed technology

      ParameterMicro LEDDLPLCoSLBSProposed
      Resolution/pixel480~720>720<720>720
      Power consumption/W0.1‒0.30.5‒1.00.5‒1.00.1‒0.30.1‒0.5
      Volume/cm3<1>21‒2<11‒2
      Color performanceG onlyRGB (good)RGB (good)RGB (poor)RGB (better)
      Technology maturityPre-productionIn productionIn productionPre-productionPre-production
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    Hongxin Li, Xianpeng Zhang, Yatao Yang. Dynamic Laser Illumination for Silicon-Based Liquid-Crystal Projection System[J]. Laser & Optoelectronics Progress, 2025, 62(8): 0811002

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    Paper Information

    Category: Imaging Systems

    Received: Jul. 2, 2024

    Accepted: Sep. 24, 2024

    Published Online: Apr. 3, 2025

    The Author Email:

    DOI:10.3788/LOP241620

    CSTR:32186.14.LOP241620

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