Luminance and gamma optimization for mobile display in low ambient conditions

Abstract

This study presents effective method to provide user's visual comfort and reduce power consumption through the optimization of display luminance and gamma curve for using mobile display in low ambient conditions. Visual assessment was carried out to obtain appropriate display luminance for visual comfort, and gamma curve was optimized to obtain power saving effect without reducing image quality in lower luminance than in appropriate luminance. This suggested method was verified through perceptual experiment and power consumption measurement.

Discomfort luminance level of head‐mounted displays depending on the adapting luminance

“…Thus, to ensure proper luminance levels (ie, maximum acceptable luminance levels that do not cause discomfort because of high brightness) of a display based on surrounding conditions without any discomfort or subjective visual fatigue, an automatic luminance control system is used to provide visual comfort and reduce power consumption. 5 There have been several patents on automatic luminance control systems, and these systems have been applied in smartphone technologies. [6][7][8] Apart from smartphones, it is also important to control the luminance of head-mounted displays (HMDs).…”

“…According to their study, excessive light intensities of displays can result in glare or visual fatigue, even though high luminance levels are generally preferred. Thus, to ensure proper luminance levels (ie, maximum acceptable luminance levels that do not cause discomfort because of high brightness) of a display based on surrounding conditions without any discomfort or subjective visual fatigue, an automatic luminance control system is used to provide visual comfort and reduce power consumption 5 . There have been several patents on automatic luminance control systems, and these systems have been applied in smartphone technologies 6‐8…”