Abstract
In this paper, a novel two-dimensional (2-D) adaptive dimming technique
with X-Y channels for light-emitting diode (LED) backlight system in LCD TVs
is proposed. The proposed LED backlight has matrix-structured LED modules
with row and column switches to control the brightness of individual division
block. It shows local dimming effects such as reduced power consumption and
high dynamic contrast ratio even with much less number of LED drivers than
that of the conventional 2-D local dimming method. Therefore, low cost and
compact design of LED drivers can be achieved. This paper also contains a
new adaptive dimming algorithm and image manipulation technique for the proposed
LED backlight system. The proposed dimming technique is verified by simulation
and experimental results based on a RGB-LED backlight of a 32-in LCD TV.
© 2009 IEEE
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