The Impact of Luminous Properties of Red, Green, and Blue Mini-LEDs on the Color Gamut

Weijie Guo; Nan Chen; Hao Lu; Changwen Su; Yue Lin; Guolong Chen; Yijun Lu; Li Li Zheng; Zhangbao Peng; Hao-Chung Kuo; Chih Hao Lin; Tingzhu Wu; Zhong Chen

doi:10.1109/TED.2019.2906321

The Impact of Luminous Properties of Red, Green, and Blue Mini-LEDs on the Color Gamut

Weijie Guo, Nan Chen, Hao Lu, Changwen Su, Yue Lin, Guolong Chen, Yijun Lu, Li Li Zheng, Zhangbao Peng, Hao-Chung Kuo, Chih Hao Lin, Tingzhu Wu^*, Zhong Chen

^*Corresponding author for this work

Department of Photonics

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Color gamut is of the paramount importance in the display. Light-current-voltage (L-I-V) characteristics of red, green, and blue flip-chip mini-light-emitting diodes (LEDs) (100 μm × 200 μm) are investigated at temperatures similar to the operational temperatures. Both the ideality factor and the temperature dependence of external quantum efficiency (EQE) suggest that the nonradiative loss in red mini-LED is higher. We also illustrate the intensive lateral luminous intensity fluctuation for red mini-LED under the over-driving current by capturing the spatial emission mapping. The influence of temperature and driving current on the chromaticity coordinates of mini-LEDs is determined. Furthermore, we propose a drive-current algorithm to maximize the color gamut of the trichromatic mixed light at different temperatures. The results indicate that, for the application of self-emitting mini-LED displays, the maximum color gamut is more sensitive to green emission, whereas enhancing the radiative recombination in red mini-LED could contribute a lot to the improvement on net performance.

Original language	English
Article number	8681719
Pages (from-to)	2263-2268
Number of pages	6
Journal	IEEE Transactions on Electron Devices
Volume	66
Issue number	5
DOIs	https://doi.org/10.1109/TED.2019.2906321
State	Published - 1 May 2019

Keywords

Displays
color gamut
mini-light-emitting diode (LEDs)

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10.1109/TED.2019.2906321

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title = "The Impact of Luminous Properties of Red, Green, and Blue Mini-LEDs on the Color Gamut",

abstract = "Color gamut is of the paramount importance in the display. Light-current-voltage (L-I-V) characteristics of red, green, and blue flip-chip mini-light-emitting diodes (LEDs) (100 μm × 200 μm) are investigated at temperatures similar to the operational temperatures. Both the ideality factor and the temperature dependence of external quantum efficiency (EQE) suggest that the nonradiative loss in red mini-LED is higher. We also illustrate the intensive lateral luminous intensity fluctuation for red mini-LED under the over-driving current by capturing the spatial emission mapping. The influence of temperature and driving current on the chromaticity coordinates of mini-LEDs is determined. Furthermore, we propose a drive-current algorithm to maximize the color gamut of the trichromatic mixed light at different temperatures. The results indicate that, for the application of self-emitting mini-LED displays, the maximum color gamut is more sensitive to green emission, whereas enhancing the radiative recombination in red mini-LED could contribute a lot to the improvement on net performance.",

keywords = "Displays, color gamut, mini-light-emitting diode (LEDs)",

author = "Weijie Guo and Nan Chen and Hao Lu and Changwen Su and Yue Lin and Guolong Chen and Yijun Lu and Zheng, {Li Li} and Zhangbao Peng and Hao-Chung Kuo and Lin, {Chih Hao} and Tingzhu Wu and Zhong Chen",

year = "2019",

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The Impact of Luminous Properties of Red, Green, and Blue Mini-LEDs on the Color Gamut. / Guo, Weijie; Chen, Nan; Lu, Hao; Su, Changwen; Lin, Yue; Chen, Guolong; Lu, Yijun; Zheng, Li Li; Peng, Zhangbao; Kuo, Hao-Chung; Lin, Chih Hao; Wu, Tingzhu; Chen, Zhong.

In: IEEE Transactions on Electron Devices, Vol. 66, No. 5, 8681719, 01.05.2019, p. 2263-2268.

Research output: Contribution to journal › Article › peer-review

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AU - Chen, Nan

AU - Lu, Hao

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AU - Lin, Yue

AU - Chen, Guolong

AU - Lu, Yijun

AU - Zheng, Li Li

AU - Peng, Zhangbao

AU - Kuo, Hao-Chung

AU - Lin, Chih Hao

AU - Wu, Tingzhu

AU - Chen, Zhong

PY - 2019/5/1

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N2 - Color gamut is of the paramount importance in the display. Light-current-voltage (L-I-V) characteristics of red, green, and blue flip-chip mini-light-emitting diodes (LEDs) (100 μm × 200 μm) are investigated at temperatures similar to the operational temperatures. Both the ideality factor and the temperature dependence of external quantum efficiency (EQE) suggest that the nonradiative loss in red mini-LED is higher. We also illustrate the intensive lateral luminous intensity fluctuation for red mini-LED under the over-driving current by capturing the spatial emission mapping. The influence of temperature and driving current on the chromaticity coordinates of mini-LEDs is determined. Furthermore, we propose a drive-current algorithm to maximize the color gamut of the trichromatic mixed light at different temperatures. The results indicate that, for the application of self-emitting mini-LED displays, the maximum color gamut is more sensitive to green emission, whereas enhancing the radiative recombination in red mini-LED could contribute a lot to the improvement on net performance.

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The Impact of Luminous Properties of Red, Green, and Blue Mini-LEDs on the Color Gamut

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