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Design of a prism light‐guide plate for an LCD backlight module
Author(s) -
Li ChenJung,
Fang YiChin,
Chu WeiTang,
Cheng MingChia
Publication year - 2008
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.2905041
Subject(s) - backlight , light guide , prism , illuminance , liquid crystal display , optics , computer science , materials science , light source , physics
— This paper describes the development of a design method for a prism pattern for an LCD light‐guide plate to improve the uniformity of its exiting light. First, the prism surface of the light‐guide plate is divided into several equal regions. With the aid of ASAP simulation, this method uses the mean light flux of all regions as a reference value to adjust the distribution density of the prism pattern for each region. Curve fitting is then performed to provide a smoothly changing distribution density for further improvement of the exiting light uniformity. ASAP results demonstrate that the illuminance uniformity for a 2.5‐in. light‐guide plate is substantially improved from 45% to 90.9% by using this design method.