A low-ripple poly-Si TFT charge pump for driver-integrated LCD panel

Author

Yoo, Changsik ; Lee, Kyun-Lyeol

Author_Institution

Dept. of Electron. & Comput. Eng., Hanyang Univ., Seoul, South Korea

Volume

51

Issue

2

fYear

2005

fDate

5/1/2005 12:00:00 AM

Firstpage

606

Lastpage

610

Abstract

A low-ripple charge pump for voltage up-conversion is described which was implemented in a poly-Si thin-film-transistor (TFT) technology for driver-integrated liquid-crystal-display (LCD) panels. The ripple voltage of the charge pump is reduced by employing a multi-phase clocking method. The charge pump was implemented in a poly-Si TFT technology. For output current of 100μA, filtering capacitor of 100 pF and pumping clock frequency of 1 MHz, the measured ripple voltage of the proposed charge pump is 135 mV while that of conventional Dickson charge pump is 590 mV. The measured pumping efficiencies of the Dickson and proposed 4-phase clocking charge pump are 59% and 65%, respectively.

Keywords

capacitors; driver circuits; elemental semiconductors; liquid crystal displays; silicon; thin film circuits; thin film transistors; 1 MHz; 135 mV; 590 mV; Si; driver-integrated LCD panel; filtering capacitor; liquid-crystal-display panels; low-ripple poly-Si TFT charge pump; multiphase clocking method; thin-film-transistor; Capacitors; Charge measurement; Charge pumps; Clocks; Current measurement; Driver circuits; Filtering; Frequency; Thin film transistors; Voltage;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/TCE.2005.1468007

Filename

1468007