Reducing OLED Degradation Using Self-Compensated Circuit for AMOLED Displays

Autor:	Kuan-Wen Chou, Yu-Cheng Chang, Kuo-Chao Liao, Chih-Lung Lin, Chia-Che Hung
Rok vydání:	2011
Předmět:	Materials science business.industry Transistor Electronic Optical and Magnetic Materials law.invention Threshold voltage Capacitor AMOLED law Thin-film transistor OLED Optoelectronics Electrical and Electronic Engineering business Diode Voltage
Zdroj:	IEEE Electron Device Letters. 32:1403-1405
ISSN:	1558-0563 0741-3106
DOI:	10.1109/led.2011.2162391
Popis:	In this letter, the electric characteristics of the fabricated organic light-emitting diode (OLED) devices are analyzed after a bias stress. Experimental results demonstrate that when a constant voltage is applied to the OLED device, the OLED threshold voltage gradually increases, resulting in the driving current to decay. Therefore, a novel voltage driving scheme for active-matrix OLEDs using low-temperature polysilicon thin-film transistors (poly-Si TFTs) is proposed. This circuit uses three TFTs to increase the aperture ratio of panels and the driving current of the OLED device to ameliorate the luminance drop that is caused by OLED degradation. Simulation results indicate that the proposed pixel circuit has high immunity to VTH variations of the poly-Si TFTs and provides an extra compensation current against OLED degradation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0dfd70b33c689aac9d29884e0e64b31b https://doi.org/10.1109/led.2011.2162391 Zobrazit plný text záznamu