Abstract
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.
Highlights
Displays have become ubiquitous in our daily lives; their applications include large-size TVs, desktop monitors, notebook computers, pads, smartphones, and near-eye displays such as virtual reality and augmented reality
To fulfill low circadian action, here, we propose a four-color micro-light-emitting diode (LED) display
As the bandwidth of phosphors got narrower, circadian action factor Under (CAF) could achieve a lower value while coverage coverage (CGC) could be larger
Summary
Displays have become ubiquitous in our daily lives; their applications include large-size TVs, desktop monitors, notebook computers, pads, smartphones, and near-eye displays such as virtual reality and augmented reality. To produce three primary colors, two types of light source have been commonly employed: 1) red, green, and blue emitters (i.e., RGB sub-pixels) and. The natural sunlight from blackbody radiation exhibits a continuous, broadband spectrum, while the displayed colors are RGB concentrated, with a narrow and strong peak at the blue wavelength. It is worth investigating whether watching such an unnatural light source for a long time would cause any health problem. We propose a new design of four-color micro-LED displays. Our design performs much better than the existing LCDs and OLED displays
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