Title :
Multi-Phase Charge Pump Generating Positive and Negative High Voltages for TFT-LCD Gate Driving
Author :
Chi-Hao Wu ; Chern-Lin Chen
Author_Institution :
Nat. Taiwan Univ., Taipei
Abstract :
A regulated charge pump circuit generating voltages of 6timesVDD and -6timesVDD is proposed for TFT-LCD gate drivers in portable equipments. The charge pump exploits multi-phase clocks and multiplex schemes to produce positive and negative voltages at the same pumping stage. One external flying capacitor and one pumping stage can be reduced. The proposed circuit has been implemented in a 5 V/32 V 0.5-mum CMOS technology. It delivers regulated 17.5 V and -14.5 V from a supply voltage of 2.8 V to 3.3 V
Keywords :
CMOS integrated circuits; driver circuits; liquid crystal displays; thin film transistors; CMOS technology; TFT-LCD gate driving; flying capacitor; multiphase charge pump generating voltages; Capacitors; Charge pumps; Circuit testing; Clocks; Driver circuits; Electronic equipment testing; Power supplies; Power systems; Thin film transistors; Voltage; TFT-LCD gate driver; regulated charge pump;
Conference_Titel :
Electronic Design, Test and Applications, 2008. DELTA 2008. 4th IEEE International Symposium on
Conference_Location :
Hong Kong
Print_ISBN :
978-0-7695-3110-6
DOI :
10.1109/DELTA.2008.80
