Optimum perceived-brightness level considering the practical use environment for the mobile organic light-emitting diode display

The white-luminance display is generally considered the representative value for screen brightness, but it is not always proportional to the users' perceived brightness. The demand for the brightness of the display also changes depending on the actual use conditions, such as the ambient condition, contents, viewing object, and display device characteristics. It is important to differentiate the perceived brightness of the display by considering the device characteristics and the use conditions. A display device with a lower black level and a high saturated primary color can make the users satisfied by emitting even a relatively low luminance level. This is the result of the simultaneous contrast and Helmholtz-Kohlrausch effect. A visual experiment considering various illuminant conditions and actual use contents proved that the perceived brightness for OLED is different from the white-luminance value. It is expected that the new luminance criteria developed herein will be used for reproducing high-quality videos like those made with HDR, one of the newly rising image-quality technologies.