Stepwise data driving method and circuits for low-power TFT-LCDs

Author

Choi, Byong-Deok ; Kwon, Oh-Kyong

Author_Institution

Div. of Electr. & Comput. Eng., Hanyang Univ., Seoul, South Korea

Volume

46

Issue

4

fYear

2000

fDate

11/1/2000 12:00:00 AM

Firstpage

1155

Lastpage

1160

Abstract

The panel AC power, the largest portion of power consumption of data driver circuits in TFT-LCDs, comes from charging and discharging quite large capacitive loads, data lines. The proposed stepwise data driving method can reduce the panel AC power consumption into only a few percent of that of conventional ones if the number of step is large enough. In the proposed driving method, external capacitors supply charge to loads in stepwise manner, and the charge returns to the capacitors instead of being discharged to ground. This charge recycling is the basis of reduction of the panel AC power. The effect of the proposed driving scheme has been analyzed by HSPICE simulation, and more than 75% saving of power consumption has been confirmed by measurement of the fabricated test circuits with 5-stepwise driving in a 0.6 μm-standard CMOS technology

Keywords

CMOS integrated circuits; SPICE; circuit simulation; driver circuits; liquid crystal displays; thin film transistors; 0.6 mum; CMOS technology; HSPICE simulation; capacitive load charging; capacitive load discharging; data lines; low-power TFT-LCD; panel AC power; power consumption; stepwise data driving circuits; stepwise data driving method; test circuits measurement; CMOS technology; Capacitors; Circuit simulation; Circuit testing; Computer interfaces; Driver circuits; Energy consumption; Frequency; Image quality; Recycling;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.920473

Filename

920473