Wide color gamut, low non-visual effect, and their stabilities related to luminous properties in four-primary-color display

Abstract

The circadian effect and photobiological safety of the display should be concerned, as well as the color gamut. By adding another primary color to the traditional blue-green-red (RGB) direct emission display, a four-primary-color display was proposed. The display presents wide color gamut and high stability with variation of primary colors. The optimal color gamut coverage (CGC) in Rec. 2020 standard reaches 98.2 %, and it also maintains above 96.5 % with 20 nm variation of peak wavelengths and full widths at half maximum (FWHMs). At D65 white point, the melanopic efficacy of luminous radiation (MELR) of four-primary-color display decreases to 0.60, which is 29.4 % and 43.9 % less than liquid crystal display (LCD) and organic light-emitting diode (OLED) display, respectively. Presenting ten reference colors, the MELRs of four-primary-color display are also less than other displays in most cases. In addition, the blue light hazard efficiency of radiation (BLHER) of four-primary-color display is slightly less than other displays. At last, the further improvement for the four-primary-color display was discussed.