Hybrid driver IC for real-time TFT non-uniformity compensation of ultra high-definition AMOLED display

Author

Jun-Suk Bang ; Hyun-Sik Kim ; Sang-Hui Park ; Ki-Duk Kim ; Sung-Won Choi ; Oh-Jo Kwon ; Choong-Sun Shin ; Joohyung Lee ; Gyu-Hyeong Cho

Author_Institution

Dept. of Electr. Eng., KAIST, Daejeon, South Korea

fYear

2015

fDate

17-19 June 2015

Abstract

An UHD AMOLED display driver IC, enabling real-time TFT non-uniformity compensation, is presented with a hybrid driving scheme. The proposed hybrid driving scheme drives a mobile UHD (3840×1920) AMOLED panel, whose scan time is 7.7μs at a scan frequency of 60Hz, through the load of 30kohm resistance and 30pF capacitance. A proposed accurate current sensor embedded in the column driver and a back-end compensation scheme reduce maximum current error between emulated TFTs within 0.94 LSB (37nA) of 8-bit gray scales. Since the TFT variation is externally compensated, a simple 3T1C pixel circuit is employed in each pixel.

Keywords

LED displays; compensation; driver circuits; integrated circuit design; organic light emitting diodes; 3T1C pixel circuit; TFT variation; UHD AMOLED display driver IC; back-end compensation scheme; capacitance 30 pF; column driver; current 37 nA; current sensor; hybrid driving scheme; mobile UHD AMOLED panel; real-time TFT nonuniformity compensation; resistance 30 kohm; time 7.7 mus; word length 8 bit; Active matrix organic light emitting diodes; Current measurement; Integrated circuits; Noise; Sensors; Thin film transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Circuits (VLSI Circuits), 2015 Symposium on

Conference_Location

Kyoto

Print_ISBN

978-4-86348-502-0

Type

conf

DOI

10.1109/VLSIC.2015.7231309

Filename

7231309