以全數位資料驅動操作之液晶顯示器畫素電路

Abstract

對於液晶顯示器內部所有的零組件來說，資料驅動器的耗能僅次於背光源，而且其大部分是消耗在訊號轉換上。我們在本篇論文裡提出一種新式的畫素電路，能夠以全數位訊號來驅動。如此一來，資料驅動器中的訊號轉換元件將可以被移除，同時大幅度降低元件的功耗。在提出的畫素電路中包含兩個薄膜電晶體以及一個電阻，以串接的方式形成畫素電壓的放電路徑。另外有第三顆薄膜電晶體負責將畫素電容預先充電至指定電壓，當特定畫素電路被掃描訊號開啟後，即可藉由控制資料訊號的脈寬來完成灰階的設定。我們利用模擬的方式將新式畫素電路操作在小尺寸與大尺寸面板中，以驗證其運作能力。此外，還將新式畫素電路與傳統1T1C畫素電路互相做比較，項目包含動態功率消耗、誤差容忍度以及開口率。由結果證實我們提出的畫素電路在新式驅動方式下，可以有效地降低資料驅動器的能量消耗。

For all the electronic modules in a liquid crystal display, the power consumption of data driver is only less than the backlight, and most part of the power is used for signal converting. In this thesis, we proposed a new kind of pixel circuit with full digital signal driving. As a result, the signal converting part in the data driver can be omitted and the power consumption can be greatly reduced. The proposed pixel circuit contains two thin film transistors and a resistor in series, forming a discharging path for pixel voltage. There is also another transistor used to pre-charge the pixel circuit. The gray level is controlled by the pulse width of the data source when the pixel is enabled by the scan voltage. The operation of the novel design is verified by simulation in the cases of small and large size panels. We compare the novel design with conventional 1T1C pixel circuit in the aspects such as dynamic power consumption, design tolerance, and aperture ratio. After all, the proposed pixel circuit with the newly driving method is an innovation approach to reduce data driver power consumption.