Abstract
Conventional backlight dimming methods can hardly be used
in edge type backlight LCD. In order to perform a power efficient backlight
local dimming in LCD of mobile devices, a novel backlight module structure
called partitioned light guide (PLG) was proposed. The PLG backlight module
consists of independently controlled light sources, allowing the light luminance
distribution to be controlled locally and efficiently. A PLG LCD prototype
with white LEDs was built for evaluation. It was proved that local backlight
dimming can be performed effectively in the edge type LCD. In addition, to
compensate the backlight nonniformity which was caused by light leakage at
the boundaries of PLG, an image distortion driven local dimming algorithm
was proposed. Image distortion level of displayed image was selected by the
user to determine how much compromise was made between power saving ratio
and image quality. More simulations with RGB LED light sources showed the
method can significantly improve the power efficiency of edge type backlight
LCD, compared with global dimming method and SSC method.
© 2013 IEEE
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