LCD图像内容自适应动态背光调试算法的研究与实现

发布时间：2018-06-02 03:22

本文选题：LCD驱动芯片 + 背光省电　；参考：《华南理工大学》2014年硕士论文

【摘要】：目前，人们对便携式移动设备需求越来越大，LCD作为人机交互界面的重要器件，，已成为人与移动设备之间的桥梁。人对色彩和信息内容的需求，使得LCD显示屏必须具有足够的分辨率、充足的颜色以及相对较大的显示区域，LCD品质的提高也导致了显示器件功耗的增大。因此提高LCD的显示品质，降低显示器件的功耗已经成为一种趋势，而动态背光技术作为提高显示品质和降低功耗的重要手段已成为国内外学者的研究热点。论文通过研究比较现有的LCD动态背光技术，提出了一种改善图像质量、降低功耗的LCD图像内容自适应动态背光调试（CABC）算法。该算法采用行扫描的方式在存储图像输入数据的同时进行亮度阈值统计，根据统计的亮度阈值调整图像的输出数据，并得到控制背光亮度的PWM控制信号，这样可以保证当前帧的图像输出数据是由当前帧的图像输入数据与所统计的亮度阈值处理得到的，同时，通过生成的PWM信号控制LED驱动芯片来降低背光亮度，达到降低功耗的效果。论文还完成了CABC模块的电路设计，并将该模块嵌入LCD驱动芯片中。芯片的FPGA验证表明，LCD显示屏上的显示图像没有出现画面闪烁，没有明显的区域色饱和以及亮度饱和现象；动态图像的显示能够跟上原始图像内容的变化，没有延时现象；经过CABC处理的输出图像与未经CABC处理的图像相比颜色更加丰富，图像质量有明显提高。
[Abstract]:At present, the demand for portable mobile devices is increasing. As an important device of man-machine interface, LCD has become a bridge between human and mobile devices. Due to the demand for color and information content, the LCD display must have enough resolution, sufficient color and relatively large display area. The power consumption of the display device is also increased because of the improvement of the quality of the LCD. Therefore, it has become a trend to improve the display quality of LCD and reduce the power consumption of display devices. As an important means to improve the display quality and reduce the power consumption, dynamic backlight technology has become the research hotspot of domestic and foreign scholars. By studying and comparing the existing LCD dynamic backlight technology, this paper presents an adaptive dynamic backlight debugging algorithm for LCD image content, which can improve image quality and reduce power consumption. The algorithm uses row scanning to store image input data and perform brightness threshold statistics. According to the statistical luminance threshold, the output data of the image are adjusted, and the PWM control signal controlling the backlight brightness is obtained. This can ensure that the image output data of the current frame is processed by the image input data of the current frame and the statistical luminance threshold. At the same time, the backlight brightness is reduced by controlling the LED driver chip by the generated PWM signal. Achieve the effect of reducing power consumption. The circuit design of CABC module is also completed, and the module is embedded in LCD driver chip. The FPGA verification of the chip shows that there is no flicker, no region color saturation and luminance saturation in the display image, and the dynamic image display can keep up with the change of the original image content, and there is no delay phenomenon. The output images processed by CABC are more colorful than those without CABC processing, and the image quality is improved obviously.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN873

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