| 光谱学与光谱分析 |
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| Study of Spectrum Drifting of Primary Colors and Its Impact on Color Rendering Properties |
| CUI Xiao-yan1, ZHANG Xiao-dong2* |
1. Automation School, Beijing University of Posts and Telecommunications, Beijing 100876, China
2. School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China |
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Abstract LEDs are currently used widely to display text, graphics and images in large screens. With red, green and blue LEDs as three primary colors, color rendition will be realized through color mixing. However, LEDs’ spectrum will produce drifts with the changes in the temperature environment. With the changes in the driving current simulating changes in the temperature, the three primary color LEDs’ spectral drifts were tested, and the drift characteristics of the three primary colors were obtained respectively. Based on the typical characteristics of the LEDs and the differences between LEDs with different colors in composition and molecular structure, the paper analyzed the reason for the spectrum drifts and the drift characteristics of different color LEDs, and proposed the equations of spectrum drifts. Putting the experimental data into the spectrum drift equations, the paper analyzed the impacts of primary colors on the mixed color, pointed out a way to reduce the chromatic aberration, and provided the theory for engineering application of color LEDs.
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Received: 2012-05-23
Accepted: 2012-07-10
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Corresponding Authors:
ZHANG Xiao-dong
E-mail: xdzhang@bjtu.edu.cn
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