TFT-LCD与OLED图像显示降低功耗方法的研究与实现

发布时间：2019-03-22 13:57

【摘要】：当今,智能移动终端设备与平板屏幕等显示器件技术正在高速发展,智能移动终端设备的续航能力越来越受到人们的关注。移动电源等续航设备已然成为了智能移动终端设备的重要配件。在这些智能设备中,其屏幕显示系统消耗了大部分的能量。因此,降低平板屏幕等显示图像时的功耗是很有必要的。本文旨在研究目前主流的TFT-LCD和OLED图像显示时降低功耗的方案和实现。本文首先分析了TFT-LCD的显示原理和功耗模型。TFT-LCD的功耗模型表明,其功耗的降低主要依靠于背光源强度的下降。但背光源强度的降低会导致图像变暗,因此需要对图像进行增强处理补偿亮度的降低。本文提出了一种降低TFT-LCD显示功耗的算法,该算法首先采用局部对比度增强方法进行图像处理,其对比度因子和亮度因子是根据图像内容动态选择的。然后根据亮度因子来确定背光调节的比例系数,从而保证图像质量的同时能有效地降低背光、节省功耗。通过实验分析,本文提出的TFT-LCD低功耗算法在保证图像显示质量的同时能大约降低50.58%的功耗。作为下一代能取代TFT-LCD的显示器件,OLED技术日益成熟,随着大屏幕显示需求日益增多,OLED的功耗也是智能移动设备续航的一大问题。因此,OLED图像显示低功耗方案的研究是很有必要的。由于TFT-LCD与OLED显示原理具有本质上的区别,TFT-LCD的低功耗方法并不能用于OLED之中。因此,本文也提出了适用于OLED显示图像降低功耗的方法。通过分析OLED的显示原理和功耗模型得出,图像像素值的降低是节省OLED显示功耗的有效方式。但是像素值的过度降低必然会导致图像显示质量明显变差。因此,OLED显示低功耗的实现必须以保证图像的显示质量。本文提出的OLED显示低功耗方法的核心是基于图像显著性和韦伯-费希纳定律的亮度调整策略。该算法定义图像的显著性均值为显著阈值,对于显著像素点,其亮度调整满足韦伯定律。对于非显著性点,设计了一种显著值与像素亮度值的线性映射关系来得到新的像素亮度值。通过实验分析,本文提出的OLED显示低功耗算法能在保证图像显示质量的同时能大约降低10.16%的功耗。总的来说,本文针对TFT-LCD与OLED所提出降低功耗的方法均能一定程度上降低它们显示图像时功耗,同时还保证了图像的显示效果和质量。
[Abstract]:Nowadays, the technology of intelligent mobile terminal device and flat screen display device is developing rapidly, and people pay more and more attention to the life-span ability of intelligent mobile terminal device. Mobile power supply and other life-cycle devices have become an important part of intelligent mobile terminal devices. In these smart devices, the screen display system consumes most of the energy. Therefore, it is necessary to reduce the power consumption of display images such as flat screen. The purpose of this paper is to study the current mainstream TFT-LCD and OLED image display to reduce the power consumption scheme and implementation. In this paper, the display principle and power model of TFT-LCD are analyzed firstly. The power consumption model of TFT-LCD shows that the decrease of power consumption is mainly due to the decrease of backlight intensity. However, the reduction of backlight intensity will cause the image to become dark, so it is necessary to enhance the image and compensate for the decrease of brightness. In this paper, an algorithm to reduce the power consumption of TFT-LCD display is proposed. Firstly, the local contrast enhancement method is used for image processing. The contrast factor and luminance factor are selected dynamically according to the content of the image. Then the proportional coefficient of backlight adjustment is determined according to the luminance factor, so that the image quality can be guaranteed and the backlight can be effectively reduced and the power consumption can be saved. Through experimental analysis, the proposed low-power TFT-LCD algorithm can reduce the power consumption by about 50.58% while ensuring the quality of image display. As the next generation of display devices that can replace TFT-LCD, OLED technology is becoming more and more mature. With the increasing demand for large-screen display, the power consumption of OLED is also a major problem in the life of intelligent mobile devices. Therefore, it is necessary to study the low power scheme of OLED image display. Because of the essential difference between TFT-LCD and OLED, the low-power method of TFT-LCD can not be used in OLED. Therefore, this paper also proposes a method to reduce the power consumption of OLED display image. By analyzing the display principle and power consumption model of OLED, it is found that the reduction of image pixel value is an effective way to save the power consumption of OLED display. However, the excessive reduction of pixel value will inevitably lead to a significant deterioration in the quality of image display. Therefore, the realization of low power consumption of OLED display must guarantee the display quality of the image. The core of this paper is the brightness adjustment strategy based on image saliency and Weber-Fischer's law. The algorithm defines the significant mean value of the image as a significant threshold, and the brightness adjustment of the salient pixel satisfies Weber's law. For non-salient points, a linear mapping relationship between salient value and pixel luminance value is designed to obtain a new pixel luminance value. Through experimental analysis, the proposed low-power OLED display algorithm can reduce the power consumption by about 10.16% while ensuring the quality of the image display. In general, the power consumption reduction methods proposed in this paper for both TFT-LCD and OLED can reduce the power consumption when they display the image to a certain extent, and also guarantee the display effect and quality of the image.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN873

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