A novel local dimming algorithm for RGB-LED backlight

Wei Huang; Zhong-Liang Jin; Yu Liu; Hai Ming; Qin-Ying Chou; Feng Li

doi:10.1117/12.837576

24 November 2009 A novel local dimming algorithm for RGB-LED backlight

Wei Huang, Zhong-Liang Jin, Yu Liu, Hai Ming, Qin-Ying Chou, Feng Li

Proceedings Volume 7509, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Integration; 750903 (2009) https://doi.org/10.1117/12.837576
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

A large size RGB LED backlight unit and its local dimming algorithm are presented in this paper. The LED backlight unit and the LCD panel are controlled synchronously to enhance image contrast and improve power efficacy. Based on the image content, the backlight intensity is locally dimmed, and pixel values are compensated according to the backlight brightness distribution. In addition, a linear function algorithm typical for a backlight system is applied to remove the grid artifacts between LED blocks. Our newly developed 32" RGB LED backlight LCD-TV prototype shows that a static display contrast of over 20000:1 can be achieved. Compared with CCFL backlight LCD-TV, an average of about 30% of the power can be saved depending on the image content.

Citation Download Citation

Wei Huang, Zhong-Liang Jin, Yu Liu, Hai Ming, Qin-Ying Chou, and Feng Li "A novel local dimming algorithm for RGB-LED backlight", Proc. SPIE 7509, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Integration, 750903 (24 November 2009); https://doi.org/10.1117/12.837576

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