Abstract
In recent years, low-power technology has had a significant impact on
portable electronic devices; with mobile devices, the low-power circuit
design has become the primary issue. At present, thin-film transistor liquid
crystal display (TFT LCD) is widely used in handheld mobile devices. In
terms of the overall system power consumption, TFT LCD power consumes
20%–45% of total system power due to different applications. The
backlight of an LCD display dominates the power consumption of the whole
system; controlling the backlight current to reduce the brightness and the
contrast of LCDs can reduce the overall power consumption. However, this may
cause significant changes in visual perception. In order to reduce the power
consumption and eliminate the visual changes, the issue becomes: how to
reduce the current by adjusting brightness and contrast in accordance with
the current image. Based on content analysis, this paper proposes two new
algorithms: the new backlight-dimming algorithm (NBDA) and the new image
enhancement algorithm (NIEA). The proposed methods can, on average,
simultaneously reduce power consumption by 47% and improve the image
enhancement ratio by 6.8%. Moreover, the structural-similarity index metric
(SSIM) is used to evaluate image quality.
© 2011 IEEE
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