Infrared and Laser Engineering, Volume. 54, Issue 7, 20250121(2025)

Dual-optical path AR-HUD system design for continuous depth adjustment

Jialiang CHAI1,2, Bo DONG1,2、*, and Changxi XUE1,2
Author Affiliations
  • 1School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, China
  • 2Key Laboratory of Advanced Optical Design and Manufacturing Technology of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China
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    Figures & Tables(17)
    Schematic diagram of holographic imaging system
    (a) The holographic display system; (b) GS algorithm iteration times and PSNR, SSIM change curve
    The reconstructed image diagram of computational holography with a virtual distance interval of 20 mm
    Field of view settings
    Schematic diagram of the dual-focal plane AR-HUD system
    Image quality evaluation results at 15 m. (a) Spot diagram; (b) MTF; (c) Grid distortion
    Results of spot diagram at different imaginary image distances. (a) At 15 m; (b) At 3 m
    MTF results when the virtual image distance is different. (a) At 15 m; (b) At 3 m
    Grid distortion results when the virtual image distance is different. (a) At 15 m; (b) At 3 m
    Principle diagram of continuous depth adjustment AR-HUD
    Variation of virtual image distance and image width of the projection unit
    Results of image quality evaluation at 7 m. (a) Spot diagram; (b) MTF curve; (c) Grid distortion
    • Table 1. LCOS-SLM device parameters

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      Table 1. LCOS-SLM device parameters

      ParameterValue
      Display typeReflective LCOS (Phase Only)
      Resolutionmax. 4160 pixel×2464 pixel
      Pixel pitch3.74 µm
      Fill factor90%
      Active area15.56 mm×9.22 mm (0.7″ Diagonal)
    • Table 2. Fitting data of automotive windshield

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      Table 2. Fitting data of automotive windshield

      ParametersData corresponding to the parameters
      Radius8370.069
      Conic215.645
      A1−2.066
      A2−0.012
      A30.039
      A4−1.197
      A50.457
      A6−1.344
      A70.013
      A8−4.632E-03
      A90.052
      A10−0.012
      A11−2.911E-03
      A12−1.802E-03
      A13−1.239E-03
      A14−4.160E-03
      A15−3.512E-03
    • Table 3. Dynamic distortion at different sampling points in the Eyebox

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      Table 3. Dynamic distortion at different sampling points in the Eyebox

      Eyebox(i,j)/mm25 mm0 mm−25 mm
      −601.3481.1471.34
      −32.50.6120.3720.628
      −50.4150.0850.446
      50.44100.416
      32.50.6860.2560.468
      601.1520.6441.037
    • Table 4. Dynamic distortion at different sampling points in the Eyebox at 7 m

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      Table 4. Dynamic distortion at different sampling points in the Eyebox at 7 m

      Eyebox(i,j)/mm25 mm0 mm25 mm
      −601.4520.9461.008
      −32.51.2650.7450.773
      −51.0370.2180.343
      51.02400.262
      32.51.2120.5280.556
      601.4290.7340.787
    • Table 5. Comparison with other HUD designs

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      Table 5. Comparison with other HUD designs

      Traditional HUD[5-6]Zoom HUD[9-10]Proposed
      Mechanical motion--YesYesNo
      Dynamic distortion----<2′
      MTF>0.3 at 6 lp/mm>0.4 at 7.1 lp/mm>0.4 at 60 lp/mm>0.4 at 6 lp/mm>0.5 at 6 lp/mm
      Mesh distortion<5%<3.05%-<3%<2.9%
      Far FOV10° × 5°10° × 3°13° × 4°14° × 5°12° × 4°
      Near FOV5° × 1°6° × 2°10° × 1°6° × 1°6° × 1°
      Near VID/m7.597.52.53
      Far VID/m2.52.52.5-7.510-207-15
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    Jialiang CHAI, Bo DONG, Changxi XUE. Dual-optical path AR-HUD system design for continuous depth adjustment[J]. Infrared and Laser Engineering, 2025, 54(7): 20250121

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    Paper Information

    Category: Optical design and fabrication

    Received: Feb. 24, 2025

    Accepted: --

    Published Online: Aug. 29, 2025

    The Author Email: Bo DONG (dongbo0404@sina.com)

    DOI:10.3788/IRLA20250121

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