具伽瑪校正的六位元數位類比轉換器與低功率緩衝器的行驅動電路

Abstract

隨著行動多媒體裝置的普及，顯示器技術也隨之革命與發展。輕、薄、低功率消耗、低成本等技術都是研究者們所追求的目標。在薄膜電晶體液晶顯示器的驅動系統中，高解析度與低功率消耗的驅動電路是最重要的研究課題。 在液晶顯示器的驅動電路中，行驅動電路消耗最多的功率且決定速度與解析度。許多液晶顯示器的行驅動電路架構被提出。然而在高效能的應用中，為不同顏色的獨立伽瑪校正與更多顯示灰階的設計是必要的。 在這篇論文中，我們提出了一個應用於薄膜電晶體液晶顯示器的行驅動電路，其結合了伽瑪校正的數位類比轉換器與低功率消耗的輸出緩衝器。電路實作上使用標準0.35微米互補金氧半導體製程，其供應電壓為5伏特，此電路的晶片面積為1.32 × 1.48 毫米平方。所設計的行驅動電路在點反轉的操作模式下，能輸出具伽瑪校正的對稱波形，且對輸出通道進行充放電。而伽瑪校正的功能也可根據不同顏色來設計。

For the popularity of mobile multimedia, display techniques also revolute and develop continuously. Light, thin, low power consumption, and cost down are demanded without end for the researchers. The high-resolution and low-power of TFT-LCD drivers are the most important issues in the implementation of display driving system. Among circuits consisting in the LCD driving system, the column driver consumes the most power and determines the speed and resolution. Several LCD column driver architectures are proposed. However, both independent gamma correction and higher gray-scale capability are necessary in high-performance applications. In this thesis, an integrated gamma-corrected digital-to-analog converter with a low-power buffer for TFT-LCD column drivers is proposed. The whole chip occupies an area of 1.32 × 1.48 mm2 fabricated in TSMC 0.35-µm 5V technology. The column driver can output symmetric gamma-corrected waveforms to charge or discharge channels under the operation of dot inversion, and can be designed for different gamma curve according to individual RGB color.