Abstract
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
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