Enhancement of the Luminance Uniformity in Large-Size Organic Light-Emitting Devices Based on In–Ga–Zn–O Thin-Film Transistors by Using a New Compensation Method

Abstract

The variations in the threshold voltage and the mobility of In-Ga-Zn-O thin-film transistors (TFTs) were significantly compensated by the proposed compensation method. The luminance difference at each pixel in the large-size organic light-emitting devices (OLEDs) was dramatically decreased less than 10% due to the stich mural and the applied data voltage difference at low gray scale level. Luminance uniformities of up to 99% were achieved for all gray levels of the OLEDs by using the external circuit and optical compensation with angle calibration.

Keywords

• OLED
• In-Ga-Zn-O TFT
• compensation pixel method
• luminance uniformity