为降低LED背光源的功耗,提高LCD的图像显示质量,提出了一种LED背光源动态调光二次修正算法.采用平均值法得到分区的初始背光灰度值;为了解决灰度截断问题,根据分区灰度最大值与平均值的差值进行第一次修正;为了抑制调光带来的光晕效应,采用空间滤波法进行第二次修正.采用侧入式LED背光源的116.8 cm(46 in)LCD实验结果表明,采用该算法后,LED背光源平均功耗降低至73.02％,灰度截断率为0.49％,平均PSNR值为67.21 dB;典型图像对比度最大达到28 600∶1,显示图像的光晕效应有了明显的改善.二次修正算法能够有效降低背光功耗,增强图像显示质量.
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