研究目的
To investigate how a display’s blue light affects the user’s circadian rhythm and to propose a four-color micro-LED display to achieve low circadian action for nighttime uses.
研究成果
The study demonstrates that the new RYGB-type micro-LED display helps to reduce the circadian effect at night. The introduction of additional yellow subpixels not only offers a better night-shift mode than simply rearranging the RGB ratios in traditional displays but also widens the color gamut of micro-LED displays.
研究不足
The study assumes the yellow micro-LED has the same line shape as the red one, which may not hold in real cases. The potential hazard of the high-energy photons from a display panel is not a real concern compared to the circadian effect.
1：Experimental Design and Method Selection:
The study evaluates RGBW-type and RYGB-type micro-LED displays in terms of circadian effect and color gamut coverage. It uses systematic optimization to study the parameter preference and correlations between each input parameter and each objective.
2：Sample Selection and Data Sources:
The study adopts measured spectra of RGB micro-LEDs from PlayNitride and assumes the yellow micro-LED has the same spectral power distribution as the red one.
3：List of Experimental Equipment and Materials:
The study uses MATLAB code for simulations and considers different full width at half maximum (FWHM) for yellow phosphor spectra.
4：Experimental Procedures and Operational Workflow:
The study involves simulating the circadian illuminance of real image contents for different displays and comparing the performance of an optimized RGB-type micro-LED display with an optimized RYGB-type micro-LED display.
5：Data Analysis Methods:
The study uses circadian action factor (CAF) as the indicator of the circadian effect and calculates the color gamut coverage (CGC) in Rec. 2020 standard.
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