Optical characteristic of the light guide plate with microstructures engraved by laser

Tun Chien Teng, Ming Feng Kuo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

In this paper, we investigated the optical characteristic of the light guide plate (LGP) with microstructures engraved by a CO2 laser. The LGP is for edge-lit backlighting of liquid crystal display. Traditionally, the microstructures on largescaled LGP are formed by screen-printing, which are hardly formed by inject molding. However, the screen-printed LGP highly scatters light and has lower optical efficiency. Therefore, a method was proposed to use the laser to directly engrave the flat surface of a bare LGP with microstructures. The engraved LGP has better optical performance due to the polished surface of the engraved-microstructures, and can be used for large-scaled application such LCD TV backlighting. We used different processing parameters to engrave the microstructures of 11 different shapes on a bare LGP and measured the cross-sectional dimensions of the microstructure. Among them, five kinds of shapes were chosen to be engraved on the bare LGPs respectively as samples. The five LGP samples were measured for spatial and angular luminance by the BM7 and Conoscope. With difference in the profiles of the microstructures, the angular distributions of light emitting from the LGP also differ. All the experimental data of the samples were compared with one another and the on-axis luminance of the best LGP sample could potentially increase 50% more than the reference sample if a proper optical film was chosen to accompany it.

Original languageEnglish
Title of host publicationNonimaging Optics
Subtitle of host publicationEfficient Design for Illumination and Solar Concentration IX
DOIs
Publication statusPublished - 2012 Dec 1
EventNonimaging Optics: Efficient Design for Illumination and Solar Concentration IX - San Diego, CA, United States
Duration: 2012 Aug 122012 Aug 14

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8485
ISSN (Print)0277-786X

Other

OtherNonimaging Optics: Efficient Design for Illumination and Solar Concentration IX
CountryUnited States
CitySan Diego, CA
Period12/8/1212/8/14

Keywords

  • Backlighting
  • Flat panel display
  • Laser engrave
  • Light guide plate
  • Luminance
  • Microstructure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Teng, T. C., & Kuo, M. F. (2012). Optical characteristic of the light guide plate with microstructures engraved by laser. In Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX [84850Y] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8485). https://doi.org/10.1117/12.931653