Abstract
Backlight dimming of Liquid Crystal Displays (LCD) is a technology which aims at saving
power and improving visual quality. The evolution of energy standards and the increasing public
expectations regarding power consumption have made it necessary for backlight systems to manage
their power. Such a control is challenging to implement, because for LCD displays quality and
power are closely interlinked, and one cannot be modified without affecting the other. To address
this issue, we present a framework for power controlled backlight dimming defining some key
concepts. Two methods to obtain backlights with a predefined power level for images are presented:
one method has low complexity and the other achieves high performance in terms of quality/power
trade-off. Those methods are evaluated on a modeled Light-Emitting Diode edge-lit backlight
display. The high-performance method performs significantly better than other algorithms from the
literature, when considering both calculated power and quality. This high-performance method is
then extended to video in three modes. The first mode favors high quality in a power-aware manner
and allow significant power variations, the second mode has strict power constraints and the third
one provides a trade-off between the other two.
© 2013 IEEE
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