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Journal of Display Technology

Journal of Display Technology


  • Vol. 9, Iss. 7 — Jul. 1, 2013
  • pp: 527–535

High-Performance Local Dimming Algorithm and Its Hardware Implementation for LCD Backlight

Shih-Chang Hsia, Ming-Hwa Sheu, Jia-Ren Chang Chien, and Shag-Kai Wang

Journal of Display Technology, Vol. 9, Issue 7, pp. 527-535 (2013)

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The local-dimming backlight has recently been presented for use in LCD TVs. However, the image resolution is low, particularly at weak edges. In this work, a local-dimming backlight is developed to improve the image contrast and reduce power dissipation. The algorithm enhances low-level edge information to improve the perceived image resolution. Based on the algorithm, a 42-in backlight module with white light-emitting diode (LED) devices was driven by a local dimming control core. The block-wise register approach substantially reduced the number of required line-buffers and shortened the latency time. The measurements made in the laboratory indicate that the backlight system reduces power dissipation by an average of 48% and exhibits no visible distortion compared relative to the fixed backlighting system. The system was successfully demonstrated in a 42-in LCD TV, and the contrast ratio was greatly improved by a factor of 100.

© 2013 IEEE

Shih-Chang Hsia, Ming-Hwa Sheu, Jia-Ren Chang Chien, and Shag-Kai Wang, "High-Performance Local Dimming Algorithm and Its Hardware Implementation for LCD Backlight," J. Display Technol. 9, 527-535 (2013)

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