Acta Optica Sinica, Volume. 45, Issue 5, 0511002(2025)

Design of Head-Up Display System Using Dual Optical Path Oblique Projection

Shanshan Cheng1... Zhili Chen1,*, Xiaowei Chen2, Bo Wang2 and Tingkang Huang2 |Show fewer author(s)
Author Affiliations
  • 1School of Optoelectronic Engineering, Xi’an Technological University, Xi’an 710021, Shaanxi , China
  • 2Huizhou Foryou Multimedia Electronics Co., Ltd., Huizhou 516006, Guangdong , China
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    Figures & Tables(19)
    Geometric diagram of side view projection of far optical path
    Schematic diagram of dual path oblique projection vehicle-mounted head-up display system
    System implementation schematic diagram
    Solid model diagram of windshield
    Surface sag diagram of windshield
    Diagram of position of human eye in eyebox
    3D diagram of dual PGU dual image plane projection optical path
    3D diagram of dual-path oblique projection automotive head-up display system
    Spot diagrams for location of center eye points of near and far optical paths. (a) Far optical path; (b) near optical path
    MTF curves of central eye point positions of near and far optical paths. (a) Far optical path; (b) near optical path
    Grid distortion diagrams of center eye point positions of near and far optical paths. (a) Far optical path; (b) near optical path
    UI diagrams before and after near optical path simulation. (a) Before simulation; (b) after simulation
    UI diagrams before and after far optical path simulations. (a) Before simulation; (b) after simulation
    • Table 1. Design indexes of optical system

      View table

      Table 1. Design indexes of optical system

      Parameter of HUDValue
      VID /mFar: 6.5‒8.5; near: 5
      FOV /[(°)×(°)]Far: 10×2; near: 10×1
      LDA /(°)2.55
      Eyebox size /(mm×mm)130×50
      PGU size /(mm×mm)

      92.16×46.08

      (1280 pixel×640 pixel)

      Grid distortion /%<5
      MTF at 7 lp /mm>0.5
    • Table 2. Maximum RMS radii of 9 eye points in near and far optical paths

      View table

      Table 2. Maximum RMS radii of 9 eye points in near and far optical paths

      Position of eye pointFar optical pathNear optical path
      Center18.16317.066
      Left21.63622.346
      Right18.25723.818
      Above17.50217.550
      Below21.22220.474
      Upper left14.53023.786
      Upper right15.31326.210
      Lower left14.61821.600
      Lower right14.12823.489
    • Table 3. Minimum MTFs of 9 eye points in near and far optical paths

      View table

      Table 3. Minimum MTFs of 9 eye points in near and far optical paths

      Position of eye pointFar optical pathNear optical path
      Center0.5910.592
      Left0.6190.557
      Right0.6200.542
      Above0.5970.594
      Below0.5860.575
      Upper left0.6420.549
      Upper right0.6370.524
      Lower left0.6100.548
      Lower right0.6110.541
    • Table 4. Maximum grid distortion values of 9 eye point positions in near and far optical paths

      View table

      Table 4. Maximum grid distortion values of 9 eye point positions in near and far optical paths

      Position of eye pointFar optical pathNear optical path
      Center3.38-0.86
      Left3.291.28
      Right3.451.14
      Above2.77-1.23
      Below4.09-2.27
      Upper left2.721.22
      Upper right2.76-1.31
      Lower left4.00-2.41
      Lower right4.17-2.09
    • Table 5. System tolerance distribution table

      View table

      Table 5. System tolerance distribution table

      Tolerance typeWindshieldFreeform secondary mirrorOptical wedgeFreeform primary mirror
      Radius /mm±1±1±1±1
      Thickness /mm±0.2±0.2±0.2±0.2
      Decenter in x direction /mm±0.20±0.20±0.01±0.20
      Decenter in y direction /mm±0.20±0.20±0.01±0.20
      Tilt in x direction /(°)±0.10±0.10±0.02±0.20
      Tilt in y direction /(°)±0.10±0.10±0.02±0.20
      Index±0.001
      Abbe number /%±0.1
    • Table 6. Monte Carlo analysis results

      View table

      Table 6. Monte Carlo analysis results

      Percentage

      of sample

      MTF value at far optical pathMTF value at near optical path
      90%0.645985100.46397618
      80%0.651257790.51108173
      50%0.658505110.58200421
      20%0.663528960.62220167
      10%0.664819700.63095607
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    Shanshan Cheng, Zhili Chen, Xiaowei Chen, Bo Wang, Tingkang Huang. Design of Head-Up Display System Using Dual Optical Path Oblique Projection[J]. Acta Optica Sinica, 2025, 45(5): 0511002

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    Paper Information

    Category: Imaging Systems

    Received: Nov. 26, 2024

    Accepted: Jan. 6, 2025

    Published Online: Mar. 21, 2025

    The Author Email: Chen Zhili (medichen@163.com)

    DOI:10.3788/AOS241797

    CSTR:32393.14.AOS241797

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