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1.康佳集团股份有限公司, 广东 深圳 518057
2.深圳康佳电子科技有限公司, 广东 深圳 518107
Received:05 September 2023,
Revised:10 October 2023,
Published:05 December 2023
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YANG Mei-hui, ZHONG Wen-kui, LIN Wei-han, et al. Relationship between duty cycle and color difference based on different color conversion methods[J]. Chinese journal of liquid crystals and displays, 2023, 38(12): 1672-1680.
YANG Mei-hui, ZHONG Wen-kui, LIN Wei-han, et al. Relationship between duty cycle and color difference based on different color conversion methods[J]. Chinese journal of liquid crystals and displays, 2023, 38(12): 1672-1680. DOI: 10.37188/CJLCD.2023-0292.
LCD背光的色彩转换包括蓝光激发YAG黄粉、蓝光激发β-SiAlON+KSF红粉、蓝光激发红绿量子点材料等3种方式。在数字调光模式下,3种色彩转换方案在不同电流占空比条件下的亮度变化趋势基本呈线性关系,但色坐标变化趋势差异明显。随着电流的变化,蓝光激发β-SiAlON+KSF红粉转换方案样品在3种样品中色坐标变化差异值最大,且红色变化比绿色明显。蓝光激发红绿量子点转换方案的色坐标变化介于其他两种方案之间,且绿色变化比红色明显。经分析,色坐标变化差异与红绿粉的量子激发效率差异有关。通过缩短KSF粉余辉时间及驱动电流调光周期可以消除“红爆”现象。
The color conversion of LCD backlight includes blue light excitation YAG yellow powder, blue light excitation β-SiAlON+KSF red powder, and blue light excitation red green quantum dot fluorescence film, etc. In the digital dimming mode, the brightness change trend of the three color conversion schemes under different current duty cycle conditions is basically linear, but the color coordinate change trend is significantly different. Blue light excitation β-SiAlON+KSF red powder conversion scheme has the largest difference in color coordinate changes among the three models with current variation, and the change in red is more significant than that in green. The color coordinate change of the blue light excited red green quantum dot conversion scheme is between the other two schemes, and the green change is more significant than the red one. After analysis, the difference in color coordinate changes is related to the difference in quantum excitation efficiency of red and green powders. By shortening the afterglow time of KSF powder and the dimming cycle time of the driving current, the“red explosion”phenomenon can be eliminated.
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