應用在薄膜電晶體液晶顯示器驅動積體電路之雙邊雙輸出切換電容式電壓轉換器

Abstract

近年來，薄膜電晶體液晶顯示面板已經成為移動或手持式電子，諸如行動電話、MP3播放器、數位像機、PDA以及筆記型電腦等，最重要的螢幕顯示元件。薄膜液晶顯示面板以高亮度、高彩度、反應速度快、低成本以及長壽命等優點擊敗了許多諸如超扭轉向列型以及有機發光二極體等顯示面板。因此薄膜液晶顯示驅動積體電路產業非常充滿活力。

切換電容式電壓轉換器又稱為充電幫浦，是最常應用在手持薄膜電晶體液晶顯示驅動積體電路的電源產生器。電壓轉換器是用來將系統輸入電壓轉換成高電壓，或甚至是負電壓，以供薄膜電晶體液晶顯示驅動積體電路的閘級驅動電路、源級驅動電路以及面板共電極參考電壓驅動電路等使用。

傳統的雙邊兩倍壓電壓轉換器利用兩個機動電容器來產生系統的兩倍電壓，傳統的雙邊電壓反向轉換器也是利用兩個機動電容器來產生系統的負一倍電壓。本論文提出了一個雙邊雙輸出電壓轉換器，並且成功的應用在以SilTerra 0.13um 1.8V/5V/32V CMOS 1P5M製程實現的QVGA解析度的薄膜電晶體液晶顯示驅動積體電路。這個新提出的電壓轉換器只需使用兩個機動電容器來同時產生兩倍以及負一倍的系統電壓。同時，此電壓轉換器比傳統的電壓轉換器節省了超過27%的積體電路佈局面積、四個積體電路輸出入阜以及兩個外部電容元件，降低了生產成本。

In recent years, as a display screen, the thin film transistor-liquid crystal display (TFT-LCD) panel becomes the most popular element for mobile or handheld devices such as cell phones, mp3 players, digital cameras, PDAs, laptops, …etc. With the advantages of high brightness, rich color depth, fast response time, low cost and long life time, the TFT-LCD panel had defeated many competitors such as the super twisted nematic (STN) and the organic light emitting diode (OLED) display panel. As a result, the industry of TFT-LCD Driver is full of vigor and vitality. The switching capacitor voltage converters which are also named the charge pumps are most commonly used in the hand-held TFT-LCD drivers for generating the power supply. The voltage converters are used to transform the system input voltage level into a higher voltage level or even a negative voltage for the use of some function blocks of the TFT-LCD drivers such as the gate drivers, the source drivers and the VCOM drivers. The conventional dual side voltage doubler uses two flying capacitors to generate two times the system input voltage and the conventional dual side voltage inverter also uses two flying capacitors to generate negative time the system input voltage. In this thesis, a dual side dual output voltage converter is proposed. This new voltage converter is successfully implemented in a QVGA resolution TFT-LCD and is fabricated with SilTerra 0.13um 1.8V/5V/32V CMOS 1P5M process. This new proposed voltage converter uses only two flying capacitors to generate two times and negative time the system input voltage, and in the meantime, the new voltage converter saves over 27% IC layout area, 4 IC pin outs and 2 external capacitors than the conventional converters and reduces the cost.