OLED’s Cause a Shift in Display Driving to DC Dimming to Improve Low Luminance Images
May 13, 2019
The shift to AMOLED displays is causing DC dimming to gain popularity in the smartphone industry. Xiaomisaid it would implement DC dimming on the Mi 9 before May 1. The company has kept, and the Mi 9 has gotten an update that ushers DC dimming on the device. Zhang Guoquan, director of Xiaomi’s mobile phone system software department announced the new DC dimming on the Mi 9 Development version only but hinted that the stable version will become available on other MIUI versions after May 1. The DC dimming mode will be turned on under low brightness. He also disclosed that the new DC dimming feature would be included on all its OLED display-packing phones. Xiaomi’s OLED devices include the Mi 9, Mi Mix 3, Redmi. DC dimming control uses a DC voltage between 0 and 10 to control the light output of the OLED panel. As the voltage goes up or down, the corresponding 0-10V dimmable driver matches the light output of the fixture to increase or decrease up to a certain percentage. DC dimming popular in lighting controls used in offices, retail spaces, and homes but the feature is now gaining traction in smartphones. Apart from the Mi 9, OPPO’s latest Reno also comes with DC dimming. The Mi 9 and Reno use a software pattern to reduce the low-brightness strobe. Xiaomi is reportedly still developing a new pure hardware DC dimming.
Figure 1: Xiaomi Pro and Mi 8 Pro