Title :
Design and Evaluation of Light Spread Function for Area-Adaptive LCD System
Author :
Cheng, Yu-Kuo ; Lu, Yen-Hsing ; Tien, Chung-Hao ; Shieh, Han-Ping
Author_Institution :
Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu
Abstract :
A methodology, based on two-dimensional super-Gaussian light spread functions (LSFs), was studied for the light-emitting-diode (LED) backlighting system in the high dynamic range (HDR) liquid crystal displays (LCDs). We proposed a novel LED-based optomechanical configuration to implement the desirable luminous pattern. A dual-liquid-crystal-panel system was constructed as a pseudo-HDR LCD to evaluate the super-Gaussian illumination. The proposed HDR scheme was verified via the current platform: overall luminance uniformity, contrast ratio and processing speed could be improved by factors of 1.55, 1.95-4.15, and 4.82, respectively. The design flexibility made the methodology applicable to any panel dimension and backlight division of the HDR LCDs, and to the conventional full-on backlighting LCDs as well.
Keywords :
Gaussian processes; LED displays; lighting; liquid crystal displays; optical design techniques; optical transfer function; LED backlighting system; LSF; area-adaptive LCD system design; dual-liquid-crystal-panel system; high dynamic range LCD; light-emitting-diode; liquid crystal displays; luminous pattern; optomechanical configuration; pseudoHDR LCD construction; two-dimensional super-Gaussian light spread function; Councils; Dynamic range; Gaussian processes; Light emitting diodes; Lighting; Liquid crystal displays; Photonics; Signal processing; System performance; Testing; Light spread function (LSF); high dynamic range liquid crystal display (HDR LCD); local-dimming backlight;
Journal_Title :
Display Technology, Journal of
DOI :
10.1109/JDT.2008.2004279
