Enhancement of Brightness Uniformity by a New Voltage-Modulated Pixel Design for AMOLED Displays

Author

Lu, Hau-Yan ; Liu, Po-Tsun ; Chang, Ting-Chang ; Chi, Sien

Author_Institution

Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu

Volume

27

Issue

9

fYear

2006

Firstpage

743

Lastpage

745

Abstract

This letter presents a new pixel design and driving method for active-matrix organic light-emitting diode (AMOLED) displays using low-temperature polycrystalline silicon thin-film transistors (TFTs). The proposed pixel circuit consists of five TFTs and one capacitor to eliminate the variation in the threshold voltage of the TFTs, and the drop in the supply voltage in a single frame operation by the source-follower-type connection and the bootstrap. The proposed pixel circuit has been verified to realize uniform output current by the simulation work using the HSPICE software. The novel pixel design has great potential for use in large-size and high-resolution AMOLED displays

Keywords

bootstrapping; brightness; organic light emitting diodes; silicon; thin film transistors; AMOLED displays; Si; active-matrix organic light-emitting diode displays; brightness uniformity; low-temperature thin-film transistors; poly-Si TFT; polycrystalline silicon thin-film transistors; single frame operation; source-follower-type connection; voltage-modulated pixel design; Active matrix organic light emitting diodes; Active matrix technology; Brightness; Circuits; Design methodology; Flat panel displays; Organic light emitting diodes; Silicon; Thin film transistors; Threshold voltage; Active-matrix organic light-emitting diode (AMOLED); current–resistance (; pixel design; polycrystalline silicon thin-film transistors (poly-Si TFTs); uniformity;

fLanguage

English

Journal_Title

Electron Device Letters, IEEE

Publisher

ieee

ISSN

0741-3106

Type

jour

DOI

10.1109/LED.2006.880648

Filename

1683865