一种基于色度学的RGBW信号映射算法评价方法

随着对高亮度、低功耗绿色显示技术的不断追求，RGBW显示技术成为了国内外的热门研究方向，已有多种RGBW显示器在市场上开始推广。由于将传统显示器rgb信号转换到RGBW显示器RGBW信号的映射算法不仅需要保留初始颜色，且需要兼容具有不同子像素布局方式的RGBW显示器，因此，信号映射算法成为RGBW显示的关键。在介绍现有的五种信号映射算法的基础上，分析了RGBW显示器中新增的白色子像素对显示颜色的作用方式以及现有四种RGBW子像素布局方式对映射算法显示效果的影响;提出了优秀映射算法应满足的三点要求，并据此推导出优秀映射算法的普适性等式及衡量映射算法亮度提升能力的亮度因子;针对五种映射算法的模拟实验表明：满足普适性等式的映射算法能更好地保留初始颜色的色调和饱和度，亮度因子可有效表征算法对亮度的提升能力。该模型不仅可用于评价现有映射算法，而且可为新型映射算法的研究提供理论指导，使之兼容于具有不同硬件参数和子像素布局的显示器，有助于RGBW显示技术的普及推广。

RGBW Signal Mapping Algorithm Assessment Based on Colorimetry

With the continuous pursuit of high brightness and low power consumption display technology,RGBW display tech-nology has been attracting increasing attention in the world.Various kinds of displays based on this technology have been pro-duced in the market.The key of this technology is signal mapping algorithm which converts RGB signal into RGBW signal with-out color distortion and compatible with different sub-pixel layouts.This paper,on the basis of five kinds of signal mapping algo-rithms,analyzes the mode of action of newly added white sub-pixel affects display color,and the display performance affected by four kinds of sub-pixel layouts;it proposes the corresponding condition of excellent signal mapping algorithm based on colorime-try and deduces the universal equation of excellent signal mapping algorithm and brightness factor which could measure the ability of enhancing brightness.The simulation experiment shows that the signal mapping algorithm which satisfies universal equation could be able to maintain the hue and saturation better.The signal mapping algorithm’s ability to enhance brightness is effective-ly characterized by brightness factor.In conclusion,the proposed universal equation can be used to evaluate existing signal map-ping algorithms,and it provides theoretical references for the research of new signal mapping algorithm which could be compati-ble with different hardware parameters and sub-pixel layouts,promote the popularization of RGBW display technology.