Journal
JOURNAL OF DISPLAY TECHNOLOGY
Volume 9, Issue 7, Pages 527-535Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JDT.2013.2237755
Keywords
Backlight; contrast ratio; LED; liquid crystals; local-dimming; TV
Funding
- National Science Council, Taiwan, Republic of China [NSC 101-2220-E-224-001, NSC 101-2220-E-224-003]
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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.
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