Abstract
In this paper, a novel two-dimensional adaptive dimming and current
compensation 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
two-dimensional 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 compensation technique for the proposed LED
backlight system. Moreover, luminance difference among blocks caused by
different I–V characteristics of LED and the
luminance variation caused by temperature change are compensated by current
sensing system. The proposed dimming technique is verified by simulation and
experimental results based on a RGB-LED backlight of a 32-inch LCD
TV.
© 2011 IEEE
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