應用非晶矽薄膜電晶體於低功耗畫素記憶電路之研究

Abstract

本篇論文的電路最主要應用在於電子標籤等需要長時間開啟的產品，當產品畫面處在待機畫面(如手機或電腦)而無畫面變換時,交流電壓仍然要維持一定的頻率做輸入,意味著持續的消耗功率。因此,如何能夠在不輸入交流電壓的情況下又能夠維持著一定電壓來減少輸入交流電壓所產生的功率消耗是目前在正被廣泛研究的課題。畫素記憶電路(memory-in-pixel, MIP)，也稱為畫素儲存電路，是一種應用畫素元件中的薄膜電晶體所設計的電路，基本是用於對靜態影像的維持以及畫素補償效果，而畫素記憶電路最主要是要減少在待機畫面時，維持畫面而不斷提供資料的資料驅動電路的功率消耗，也就是主要功能為減少AC power的多餘消耗。在本篇論文中，提出了兩種使用非晶矽薄膜電晶體(Amorphous Thin-Film Transistor, A-Si TFTs)的畫素記憶電路來解決上述的問題，利用這兩種畫素記憶電路分別操作在10Hz以及1Hz的操作頻率下，於待機畫面時提供畫素穩定的電壓，並將畫素面積控制在198.5um*202.5um內，不但可以減低面板在靜態影像的更新頻率，更是成功展現在靜態影像維持畫面的效果，對於實現低功耗的畫素補償技術之目標前進了一大步。

In this essay, the main application of designed circuits is used in the electronic tag which is always at standby mode. However, when the screen is in standby mode (exists in some technologies such as mobile phones or computers) and no image changing, the AC voltage is needed to input with a certain frequency, which means continuous increasing power consumption. Therefore, how to reducing the power consumption by maintaining the inversion voltage with certain frequency when no AC voltage inputting is the main subject which is being extensively studied. The circuit, which we designed, is called memory in pixel (MIP). Memory in pixel circuit use the pixel TFT in order to maintain static image and compensate the pixel voltage. The main point of MIP: to reduce the AC power consumption of data driver while TFT-LCD is at standby operation. In this essay, two pixel memory circuits are proposed to solve the above problem and hold voltage in a frame time with 10Hz and 1Hz operation by use amorphous thin film transistor. The restriction of pixel size is 198.5um*202.5um. Using the pixel memory can provide stable voltage and would reduce the refresh rate in static mode. It is the great advancement for achieving the goal for the pixel compensative technique with the function of low power consumption.