Abstract
Locally dimmable backlight modules can effectively improve the dynamic
range of liquid-crystal displays (LCDs) to human vision range. The resolution
of addressable segments and the optical profile of these segments primarily
determine the perceived image quality such as the contrast enhancement and
boundary visibility. Contrast sensitivity function, the gradient of backlight
image of $\pi/100$ of background
luminance (units: nits/degree), was found as the threshold for the visibility
of boundaries. Additionally, a study on a recommended profile with an economical
number of segments was studied. Our results confirm that image qualities with
this backlight modulation are improved in contrast enhancement and boundary
perception using 2D-dimming backlight.
© 2008 IEEE
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