Chinese Journal of Liquid Crystals and Displays, Volume. 38, Issue 7, 910(2023)

Optical design of super miniature Micro-LED projection

Yao LI1, Hao-nan JIANG1, Zi-ping ZHOU1, Jin-pei DONG1, En-guo CHEN1,2、*, Yun YE1,2, Sheng XU1,2, Jie SUN1,2, Qun YAN1,2, and Tai-liang GUO1,2
Author Affiliations
  • 1National & Local United Engineering Laboratory of Flat Panel Display Technology,College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China
  • 2Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China(Mindu Innovation Laboratory),Fuzhou 350108,China
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    Figures & Tables(13)
    (a)The world’s first compact full-color LED pico-projector prototype[11];(b)Monochrome pico-projection system based on self-emitting OLED chips[12];(c)The world’s smallest OLED micro-display projection device[13];(d)μLED full color pico-projection optical engine[14].
    Schematic of the μLED pico-projection optical system
    Structure of optical path for μLED pico-projection lens
    MTF curves of the μLED pico-projection lens
    System aberration diagram.(a)Point column diagram;(b)Field curve distortion curve.
    (a)Schematic diagram of the pixel luminescence of a μLED chip;(b)Relationship between luminous intensity/luminous flux of a μLED pixel and angular distribution.
    Light energy utilization relationship in μLED pico-projection system
    Coupling efficiency and system efficiency curves of lens with fixed aperture angles for different divergence half angles
    μLED pico-projection optical system device.(a)Pico-projection device structure;(b)Projection pattern of the device.
    • Table 1. Performance comparison of mainstream pico-projection systems and structure diagram

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      Table 1. Performance comparison of mainstream pico-projection systems and structure diagram

      System TypeDLPLCoSMicro-OLEDμLED
      MechanismIllumination moduleBacklight moduleSelf-luminousSelf-luminous
      BrightnessMediumLowMediumHigh
      Form factorLargeMediumSmallSmall
      Luminous efficacyMediumLowMediumHigh
      Structure diagram
    • Table 2. Parameters of μLED display panel

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      Table 2. Parameters of μLED display panel

      ParametersSpecifications
      Display size/mm3.302(0.13 in)
      Effective display area/mm2.64×2.02
      Resolution640×480
      Pixel pitch/μm4
      Luminance/(cd·m-2400 000
      Wavelength/nm625
    • Table 3. Parameters and design indicators of the lens

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      Table 3. Parameters and design indicators of the lens

      ParametersSpecifications
      Number of lenses≤4
      Image height/mm1.65
      OAL/mm≤1.5
      BFL/mm≤3.5
      MTF≈0.5@121 lp/mm
      FOV/(°)20°~30°
      Wavelength/nm625
    • Table 4. Each surface data of the μLED pico-projection lens

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      Table 4. Each surface data of the μLED pico-projection lens

      SurfaceTypeRadius/mmThickness/mmGlassSemi-aperture
      OBJStandard
      1Standard1.330.39HLAF3_CDGM0.58
      2Standard-49.000.12Air0.69
      3Standard-4.240.13HZF6_CDGM0.69
      4Standard1.340.10Air0.55
      STOStandard0.19Air0.46
      6Standard-142.290.13HQK3L_CDGM0.69
      7Standard4.890.24HZBAF21_CDGM0.69
      8Standard-2.613.10Air0.58
      IMAStandard0.00Air1.65
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    Yao LI, Hao-nan JIANG, Zi-ping ZHOU, Jin-pei DONG, En-guo CHEN, Yun YE, Sheng XU, Jie SUN, Qun YAN, Tai-liang GUO. Optical design of super miniature Micro-LED projection[J]. Chinese Journal of Liquid Crystals and Displays, 2023, 38(7): 910

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    Paper Information

    Category: Research Articles

    Received: Nov. 7, 2022

    Accepted: --

    Published Online: Jul. 31, 2023

    The Author Email: En-guo CHEN (ceg@fzu.edu.cn)

    DOI:10.37188/CJLCD.2022-0216

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