Affiliation:
1. Sharp Display Technology Corporation Mie Japan
Abstract
In recent years, OLED displays have been widely used in
smartphones, in‐vehicle displays, and so on. Such applications
require a dimming function that responds to external ambient
light. It is also necessary to achieve precise gradation and color
reproducibility in low luminance levels in dark environments. In
this paper, we address two problems of gradation collapse in low
luminance levels during low luminance dimming using PWM‐
driven duty ratio control, and color shift due to current leakage
between sub‐pixels. In addition, we propose a correction method
for improving gradation reproducibility and color reproducibility,
using luminance correction.