Charge Pump Design for TFT-LCD Driver IC Using Stack-MIM Capacitor

Gyu-Ho LIM; Sung-Young SONG; Jeong-Hun PARK; Long-Zhen LI; Cheon-Hyo LEE; Tae-Yeong LEE; Gyu-Sam CHO; Mu-Hun PARK; Pan-Bong HA; Young-Hee KIM

doi:10.1093/ietele/e91-c.6.928

Special Section on Analog Circuits and Related SoC Integration Technologies

Charge Pump Design for TFT-LCD Driver IC Using Stack-MIM Capacitor

Gyu-Ho LIM, Sung-Young SONG, Jeong-Hun PARK, Long-Zhen LI, Cheon-Hyo LEE, Tae-Yeong LEE, Gyu-Sam CHO, Mu-Hun PARK, Pan-Bong HA, Young-Hee KIM

Author information

Gyu-Ho LIM
SoC Design Lab., Department of Electronic Engineering, Changwon National University
Sung-Young SONG
SoC Design Lab., Department of Electronic Engineering, Changwon National University
Jeong-Hun PARK
SoC Design Lab., Department of Electronic Engineering, Changwon National University
Long-Zhen LI
SoC Design Lab., Department of Electronic Engineering, Changwon National University
Cheon-Hyo LEE
SoC Design Lab., Department of Electronic Engineering, Changwon National University
Tae-Yeong LEE
SoC Design Lab., Department of Electronic Engineering, Changwon National University
Gyu-Sam CHO
SoC Design Lab., Department of Electronic Engineering, Changwon National University
Mu-Hun PARK
SoC Design Lab., Department of Electronic Engineering, Changwon National University
Pan-Bong HA
SoC Design Lab., Department of Electronic Engineering, Changwon National University
Young-Hee KIM
SoC Design Lab., Department of Electronic Engineering, Changwon National University
The Institute of Electronics, Information and Communication Engineers

Keywords: charge pump, pumping capacitor, stack-MIM, clock driver, TFT LCD

JOURNAL RESTRICTED ACCESS

2008 Volume E91.C Issue 6 Pages 928-935

DOI https://doi.org/10.1093/ietele/e91-c.6.928

Details

Abstract

A cross-coupled charge pump with internal pumping capacitor, which is advantageous from a point of minimizing TFT-LCD driver IC module, is newly proposed in this paper. By using NMOS and PMOS diodes connected to boosting nodes from VIN nodes, the pumping node is precharged to the same value at the pumping node in starting pumping. Since the first-stage charge pump is designed differently from the other stage pumps, a back current of pumped charge from charge pumping node to input stage is prevented. As a pumping clock driver is located in front of pumping capacitor, the driving capacity is improved by reducing a voltage drop of the pumping clock line from parasitic resistor. Finally, a layout area is decreased more compared with the conventional cross-coupled charge pump by using a stack-MIM capacitor. A proposed charge pump for TFT-LCD driver IC is designed with 0.13μm triple-well DDI process, fabricated, and tested.

Corresponding author

Register with J-STAGE for free!