New Voltage-Programmed AMOLED Pixel Circuit to Compensate for Nonuniform Electrical Characteristics of LTPS TFTs and Voltage Drop in Power Line

Author

Chih-Lung Lin ; Chia-Che Hung ; Po-Syun Chen ; Po-Chun Lai ; Mao-Hsun Cheng

Author_Institution

Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan

Volume

61

Issue

7

fYear

2014

fDate

Jul-14

Firstpage

2454

Lastpage

2458

Abstract

This paper presents a simple pixel structure that uses the voltage-programmed method to compensate for the electrical characteristic variations in low-temperature polycrystalline-silicon thin-film transistors and the current-resistance (I-R) voltage drop in the power line for active-matrix organic light-emitting diode displays. Based on the experimental results, the functionality of the pixel circuit can be operated correctly during each operation phase. Moreover, the pixel current exhibits high uniformity against the threshold voltage and mobility variations in the driving TFT.

Keywords

LED displays; organic light emitting diodes; power cables; thin film transistors; LTPS; TFT; active-matrix organic light-emitting diode displays; current-resistance voltage drop; low-temperature polycrystalline-silicon thin-film transistors; power line; voltage-programmed AMOLED pixel circuit; voltage-programmed method; Active matrix organic light emitting diodes; Educational institutions; Electrical engineering; Thin film transistors; Threshold voltage; Active-matrix organic light-emitting diode (AMOLED); low-temperature polycrystalline-silicon thin-film transistors (LTPS TFTs); low-temperature polycrystalline-silicon thin-film transistors (LTPS TFTs).;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2014.2325612

Filename

6824793