Spectral optimization of RGB micro-LED displays for wide color gamut and health benefits across different age groups

Abstract Using a genetic algorithm (GA), age-related circadian action factor (CAF(A)) and blue light hazard (BLH(A)) models were established to investigate health implications of RGB micro-LED displays. Red light peak wavelength correlates positively with color gamut coverage (CGC) in Rec. 2020 standard, green light exhibits the highest sensitivity, while blue light has a lesser effect. Increasing the green peak wavelength and blue Full Width at Half Maximum (FWHM) can reduce CAF(A) and BLH(A). Adding green light FWHM increases them. Red light peak wavelength growth boosts both, while FWHM has little effect. Changes in blue light peak wavelength differently affect CAF(A) and BLH(A) across age groups. Young individuals have initial CAF(A) increase followed by stabilization, while middle and old adults see continuous rise. BLH(A) declines in the young, briefly rises and falls in middle age, and increases in old age. This finding is reiterated in the comparison of CAF(A) and BLH(A) in youth (20 years), middle (50 years) and old age (80 years). In addition, in these three ages, as age increases, the blue and red light power ratio decrease, and the green light ratio increases. These findings suggest approaches for customizable healthy RGB micro-LED displays for different age groups.