Title :
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
fDate :
5/1/2005 12:00:00 AM
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;
Journal_Title :
Consumer Electronics, IEEE Transactions on
DOI :
10.1109/TCE.2005.1468007
