Abstract
In order to cut down the power consumption of LCD backlight and maintain the image quality,a modulation algorithm based on hierarchical tone mapping for LED backlight is proposed.The image is layered by the low pass filter,then sent to the brightness logarithmic mapping function to map the low-frequency part to a lower dynamic range,and finally combined with the gained high-frequency part for outputting.Using the numerical value to which the maximum gray-scale of the image can increase as the value of number of the LED backlight factor that can be lowered,dynamic backlight scaling techniques are adopted to reduce the backlight intensity,improve the transmittance of LCD and compensate its brightness.Simulation results show that power consumption is reduced by 15.0% and 34.0% when the distortion rate is at 4.8% and 15.6% respectively.
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