Variation of LED Display Color Affected by Chromaticity and Luminance of LED Display Primary Colors

Xinyue Mao,Xifeng Zheng,Yu Chen,Ruiguang Wang,Hongbin Cheng,Krzysztof Puszynski

doi:10.1155/2020/1612931

Abstract

In recent years, the effect of LED display is increasingly important in the LED display field. Primary colors’ chromaticity and luminance of LED display as crucial elements influence the LED display color. Therefore, there is a need for color mapping algorithms that indicate the relationship between primary colors and display color’s chromaticity and luminance. In this paper, two mathematical models have been developed. One has shown the display color’s chromaticity and luminance affected by luminance of primary colors change. The other one has shown a complicated relationship that primary color is mixed by other primary colors to change chromaticity first and then the mixed primary is used as “new LED primary color.” In both mathematical models, CIE x∗y∗Y color space was used as the mutual color space; thus, there was a specific variation tendency of colors with luminance or chromaticity of primary colors change in this color space. The newly designed mathematical models can consistently guide us how to acquire the desired display color by changing luminance or chromaticity of primary colors. Therefore, it has important engineering application value.

Highlights

Light emitting diode (LED) display is the mainstream display device used in various fields because of the advantages of high color saturation, high brightness, high contrast, and large display [1, 2]
Two mathematical models have been developed to indicate the variation of LED display color affected by chromaticity and luminance of LED display primary colors. e derivation of two models accounts for the fact that LED primary colors are variable in different application environments
Other papers have indicated characterization models to establish the transformation between RGB and XYZ, an important case that one primary color mixed by the other one or two primary colors to reduce the saturation as well as mixing primary colors as “new LED primary colors” has been ignored. erefore, the mathematical models are beneficial to investigate the relationship between variation of primary colors and variation of LED display colors

Summary

Introduction

Light emitting diode (LED) display is the mainstream display device used in various fields because of the advantages of high color saturation, high brightness, high contrast, and large display [1, 2]. All of the above models describe the transformation of digital input values (RGB) to the XYZ, providing a more accurate mathematical method to predict and control the color performance of mobile displays These models fail represent in detail the track of the display color in the three-dimensional space CIE x∗y∗Y (CIE1931) with the little digital input values change. A mathematical model of PCCM&MPCLM coefficients related to variation of display color’s luminance and chromaticity is developed. Both mathematical models are researched in the threedimensional space CIE x∗y∗Y to represent the relationship between variation of LED display color and the primary colors luminance and chromaticity change

Color Space Transformation and Gamut of LED Display

Variation of the Display Color by the Primary Colors Coefficients of PCLM

Conclusions