Opportunistic multichannel driving scheme for low power mobile TFT-LCD driver IC

Author

Lee, J.G. ; Kong, B.-S. ; Lee, Chang-Gun ; Woo, J.H. ; Jun, Y.-H.

Author_Institution

Sungkyunkwan Univ., Kyunggi-Do, South Korea

Volume

41

Issue

13

fYear

2005

fDate

6/23/2005 12:00:00 AM

Firstpage

736

Lastpage

737

Abstract

A novel source driving scheme called opportunistic multichannel driving (OMCD) is proposed for use in mobile TFT-LCD driver ICs (T-LDIs). In the OMCD scheme, the operation of the source drivers of a T-LDI is controlled by the equivalence of RGB colour data for adjacent pixels. That is, one source driver drives the neighbouring source lines as well as the corresponding one when the colour data of adjacent pixcels are identical to each other. With this scheme, all the source drivers associated with the neighbouring source lines can be completely turned off, allowing the reduction of static and dynamic current of these drivers. A test chip was fabricated in a 5 V/0.8 μm 2.5 V/0.25 μm triple-metal CMOS process, and the experimental result shows that the power reduction of 12-21% was obtained with die size overhead less than 0.5%.

Keywords

CMOS integrated circuits; colour displays; driver circuits; liquid crystal displays; low-power electronics; mobile handsets; thin film transistors; 0.25 micron; 0.8 micron; 2.5 V; 5 V; RGB colour data; T-LDI; low power electronics; mobile TFT-LCD driver IC; opportunistic multichannel driving; source driving scheme; triple-metal CMOS process;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20051138

Filename

1459872