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Effect of Strains and V-Shaped Pit Structures on the Performance of GaN-Based Light-Emitting Diodes
Open AccessFeature PaperArticle

Design and Simulation of Low Circadian Action Micro-LED Displays with Four Primary Colors

College of Optics and Photonics, University of Central Florida, Orlando, FL 32816, USA
AU Optronics Corp., Hsinchu Science Park, Hsinchu 300, Taiwan
Author to whom correspondence should be addressed.
Crystals 2020, 10(5), 383;
Received: 8 April 2020 / Revised: 1 May 2020 / Accepted: 5 May 2020 / Published: 8 May 2020
(This article belongs to the Special Issue GaN-Based Optoelectronic Materials and Light Emitting Devices)
Nowadays, displays are ubiquitous in our daily lives. Long-time exposure to a display’s unnatural light could influence the user’s circadian rhythm, especially at night. Here, we propose a four-color micro-light-emitting diode (LED) display to achieve low circadian action for nighttime uses. Specifically, we evaluate the RGBW-type (red, green, blue, and white) and RYGB-type (red, yellow, green, and blue) micro-LED displays in terms of circadian effect and color gamut coverage. With the addition of an extra white subpixel, it was found that the circadian effect at night can be reduced dramatically, but the color gamut remains unchanged. However, with an additional yellow subpixel, both the circadian effect and color gamut were found to improve. Finally, we simulated the circadian illuminance of real image contents for different displays. In comparison with existing liquid crystal displays, organic LED displays, and RGB (red, green, blue) micro-LED displays, the proposed four-primary-color micro-LED displays can significantly reduce the circadian effect at night. View Full-Text
Keywords: circadian action; micro-LEDs; four primary colors circadian action; micro-LEDs; four primary colors
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He, Z.; Tan, G.; Lan, Y.-F.; Wu, S.-T. Design and Simulation of Low Circadian Action Micro-LED Displays with Four Primary Colors. Crystals 2020, 10, 383.

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