Acta Optica Sinica, Volume. 38, Issue 6, 0622001(2018)

Design of Laser Projection Display Illumination System Based on Freeform Surface Array

Wei Zhao1,2, Xu Liu1,2, and Haifeng Li1,2、*
Author Affiliations
  • 1 State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou,Zhejiang 310027, China
  • 2 College of Optical Science and Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China
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    Figures & Tables(15)
    Schematic of using freeform surface array to achieve uniform illumination
    (a) Illuminance distribution of the collimated laser; (b) illuminance distribution of the collimated laser through the freeform surface array
    Structure of laser illumination system
    Schematic diagram of unit vector of outgoing ray calculation at any point of freeform surface
    Topological relation of coordinate system between the freeform surface and the target surface
    Schematic of freeform surface constructed by geometric method
    Illuminance distribution at X=0 and Y=0 on the focal plane of convergent lens
    Illuminance maps of target surface corresponding to different lengths of round bar. (a) 60 mm; (b) 70 mm; (c) 80 mm
    (a) Illuminance distribution of the emergent light from combiner system; (b) latitude and (c) longitude distribution of the energy density of the emergent light from combiner system
    (a) Schematic of freeform surface unit uniform light; (b) normal vector error of the freeform surface model; (c) illuminance distribution of target surface; (d) illuminance curves at X=0 and Y=0 on the target surface
    Results of laser illumination light path and ray tracing
    (a) Relationship between target surface uniformity and array number of freeform surface units with different aspect ratios; (b) illuminance distribution and (c) energy distribution of the 4.5455 mm×4.5455 mm freeform surface lens; (d) illuminance distribution and (e) energy distribution of the 6.25 mm×3.515625 mm freeform surface lens
    • Table 1. Parameters of convergent lens

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      Table 1. Parameters of convergent lens

      Lens typeSemi-diameter /mmRadius /mmThickness /mm2nd order term4th order term6th order term
      Even asphere20.000029.177515.00000.0107074.8057×10-6-2.9552×10-9
    • Table 2. Parameters of collimating lens

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      Table 2. Parameters of collimating lens

      Lens typeSemi-diameter /mmRadius /mmThickness /mm2nd order term4th order term6th order term
      Even asphere30.0000-53.722820.0000-6.0683×10-38.1257×10-7-1.3415×10-10
    • Table 3. Size and array number of freeform surface units

      View table

      Table 3. Size and array number of freeform surface units

      Aspect ratioSize /(mm×mm)Number of array
      1∶14.5455×4.545511×11
      5.5556×5.55569×9
      6.2500×6.25008×8
      16∶96.2500×3.51568×15
      7.4074×4.16677×12
      8.3334×4.68756×11
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    Wei Zhao, Xu Liu, Haifeng Li. Design of Laser Projection Display Illumination System Based on Freeform Surface Array[J]. Acta Optica Sinica, 2018, 38(6): 0622001

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    Paper Information

    Category: Optical Design and Fabrication

    Received: Sep. 8, 2017

    Accepted: --

    Published Online: Jul. 9, 2018

    The Author Email: Haifeng Li (lihaifeng@zju.edu.cn)

    DOI:10.3788/AOS201838.0622001

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