LTPS-TFT Pixel Circuit to Compensate for OLED Luminance Degradation in Three-Dimensional AMOLED Display

Author

Lin, Chih-Lung ; Chang, Wen-Yen ; Hung, Chia-Che ; Tu, Chun-Da

Author_Institution

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

Volume

33

Issue

5

fYear

2012

fDate

5/1/2012 12:00:00 AM

Firstpage

700

Lastpage

702

Abstract

A new low-temperature polysilicon thin-film-transistor pixel circuit for 3-D active-matrix organic light-emitting diode (OLED) display and its driving scheme that is based on simultaneous emission at a frame rate of 240 Hz are proposed. The proposed circuit can compensate for the threshold voltage deviation of TFTs and power-line IR-drops. Moreover, the degradation of OLED luminance is reduced using a feedback structure. The measurement results of the relationship between the luminance degradation and the threshold voltage shift of the OLED confirmed the stability of the luminance of the proposed circuit.

Keywords

brightness; elemental semiconductors; low-power electronics; organic light emitting diodes; silicon; thin film transistors; 3D active-matrix organic light-emitting diode display; LTPS-TFT pixel circuit; OLED luminance degradation; Si; feedback structure; frequency 240 Hz; low-temperature polysilicon thin-film-transistor pixel circuit; power-line IR-drop; three-dimensional AMOLED display; threshold voltage deviation; threshold voltage shift; Active matrix organic light emitting diodes; Degradation; Error analysis; Thin film transistors; Three dimensional displays; Threshold voltage; Active-matrix organic light-emitting diode (OLED) (AMOLED); low-temperature polysilicon thin-film transistor (LTPS-TFT); three-dimensional (3-D);

fLanguage

English

Journal_Title

Electron Device Letters, IEEE

Publisher

ieee

ISSN

0741-3106

Type

jour

DOI

10.1109/LED.2012.2188270

Filename

6174437