Reducing OLED Degradation Using Self-Compensated Circuit for AMOLED Displays

被引：6

作者：

Lin, Chih-Lung ^{[1
,2
]}

Chou, Kuan-Wen ^{[2
]}

Hung, Chia-Che ^{[2
]}

Chen, Yu-Cheng ^{[2
]}

Liao, Kuo-Chao ^{[2
]}

机构：

[1] Natl Cheng Kung Univ, Adv Optoelect Technol Ctr, Tainan 70101, Taiwan

[2] Natl Cheng Kung Univ, Dept Elect Engn, Tainan 70101, Taiwan

来源：

IEEE ELECTRON DEVICE LETTERS | 2011年 / 32卷 / 10期

关键词：

Lifetime; organic light-emitting diode (OLED) degradation; pixel circuit; threshold voltage; THRESHOLD-VOLTAGE SHIFT; LIGHT-EMITTING DEVICES; PIXEL CIRCUIT; TFT;

D O I：

10.1109/LED.2011.2162391

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 V(TH) variations of the poly-Si TFTs and provides an extra compensation current against OLED degradation.

引用

页码：1403 / 1405

页数：3

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