Abstract
In this paper, we propose an advanced backlight dimming technique that preserves
the quality of color and details in images even when the backlight luminance of liquid
crystal display (LCD) devices is lowered. The proposed backlight dimming technique
consists of the following two steps: backlight luminance level selection and pixel
compensation. In the first step, to reduce power consumption, the proposed approach
selects an optimal level of backlight luminance for a given image based on image quality
evaluation that considers the peak signal-to-noise ratio (PSNR) and color distortion
level. In the second step, it adaptively adjusts the RGB ratio depending on image
details, thereby enhancing image color and details, which are degraded by the lowered
backlight luminance level calculated in the first step. The simulation results showed
that the proposed method successfully selected the optimal backlight luminance level and
prevented severe color distortion, while the benchmark method induced severe color
distortion in some images. In addition, for the same backlight luminance level, pixel
compensation in the proposed method reduced color difference for color distortion
evaluation and the loss rate of edge strength, which showed detail loss by up to 3.58%
and 40.55%, compared to benchmark methods, respectively.
© 2013 IEEE
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