On-Glass Driving Circuits Design for LCD in LTPS Technology

• Main Authors: Ju-Lin Huang, 黃如琳
• Other Authors: Ming-Dou Ker
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/35aahk

碩士 === 國立交通大學 === 電子工程系所 === 92 === In this thesis, on-glass driving circuits for LCD are designed and implemented in low temperature poly silicon (LTPS) technology. The driving circuits for LCD are divided into two parts, gate driver and source driver. Gate driver includes shift registers, level shifters, and output buffers. Source driver is composed of shift registers, latches, level shifters, a digital to analog converter, and output buffers. The implement of the on-glass source driver is the focus in this thesis. First, two circuits, which are slew rate enhancement output buffer and low power class-B output buffer, are designed to drive the heavy loading of LCD. Second, a threshold voltage compensation circuit is proposed to solve the drift of the threshold voltage in LTPS process. Third, due to the nonlinear relationship between transparency and voltage across liquid crystal, a digital to analog converter with gamma correction is adopted to compensate this effect. Finally, level shifters using body-bias technique are also proposed. According to TSMC 0.35-μm CMOS HV process, the operational speed and power consumption of level shifters in different body-bias voltages are simulated and analyzed. All of above circuits have been implemented in TOPPOLY 6-μm or 3-�慆 LTPS process. Moreover, in order to satisfy the high resolution LCD, source driver usually employs the specification for reduced swing differential signaling (RSDS) as the transition interface in the data receiver. Besides, the application of the specification for RSDS will increase the data transition speed and reduce the electric magnetic interference (EMI) effect. So, a fundamental RSDS receiver in TOPPOLY 6-μm LTPS process is also included in this thesis.