Research And Design In Large-screen Tft-lcd Source Driver

With the explosive development and popularization of TFT-LCD, it is of great significance to research its key block - the driver IC circuits. This thesis analyzes and designs the Source Driver IC circuits for large panel TFT-LCD. The circuits are designed with high voltage mixed signal technology with digital power supply of 3.3V and analog power supply of 13.5V The designed Source Driver is for 8-bit full color display of 16,777,216 colors. By importing 18 reference voltages from outside, the internal D/A circuits generate the Gamma Correction curve for TFT-LCD. With the Rail-to-Rail input/output buffer amplifier, the dynamic input/output range is from VSS2 + 0.1 V to VDD2 - 0.1 V. The RSDS interface is used and the maximum data input rate is 85MHz which satisfies the UXGA (1600*1200) display standard. The research work of this thesis includes:1. The principle of TFT-LCD is analyzed. Based on the large panel LCD display and the target technology, the system design of Source Driver and the functionality partition are described. According to the non-linear D/A conversion of display, the Gamma Correction D/A architecture is designed. Moreover, the architecture of output channel circuits supporting polarity inversion is designed in accordance with the dot-inversion display mode.2. For the digital part of Source Driver, the tool based synthesis is used to generate the TCON circuit while other blocks, including 160-bit bidirectional shirt register, serial to parallel module, input register and data latch, are designed by hand using basic digital cells.3. Since the Source Driver is a mixed singal IC where analog is more complex in nature, the analog part is more emphasized than digital part in this thesis. The key analog circuits including bias circuit (HV/LV), RSDS interface circuit, level shifter circuit, D/A converter, Rail-to-Rail input/output buffer amplifier and offset cancellation circuit are described in detail with HSPICE simulation results.4. With the concept of low power and high dynamic range in mind, a Class-AB Rail-to-Rail input/output buffer amplifier is designed. It features in its simplicity and high drive capability which is not only suitable for Source Driver, but also for other VLSI application.