Comparison of perceived brightness and colorfulness for various display technologies

Modern displays are based on liquid crystals, organic emitters, quantum dots (QDs) or microLEDs and exhibit different color coordinates. Due to the Helmholtz–Kohlrausch (HK) effect, they appear different even when displaying the same color at the same luminance and color coordinates. We study the HK effect for three LCDs, including QD and OLED. All were calibrated to the 'common color gamut'. We conducted a user study involving 20 participants and calibrated test patterns. The subjects compared the displays, e. g. in terms of perceived brightness. The results confirmed the HK effect and quantified it. The OLED with a green luminance of 56 cd/m2 was perceived similar to the TN LCD with 65 cd/m2 when calibrated for perceived brightness. A 10% blue luminance reduction could be recognized in different tests by subjects for the OLED. Our results can be used to reduce power consumption and improve color perception.