利用脈衝重疊偵測之主動觸控面板的研究

Abstract

在本篇論文中，我們提出了一個新的主動式觸控電路，我們只須用到二或三個TFT和兩個連續的閘極脈衝。利用觸摸面板時RC時間常數的改變，造成脈衝重疊，而讓TFT在面板被觸摸時瞬間開啟，並利用偵測TFT開啟時的電流去判斷觸摸與否。並且此電路比較不會因為TFT之臨限電壓變異而有影響，改善了先前主動式觸控面板的缺點。我們也提出觸控面板設計的流程，並成功的設計出42吋的觸控面板。

In this thesis, we propose a novel active touch panel circuit, and we only use two or three TFTs and two consecutive gate pulses. We use the RC time constant changes when panel is touched to induce pulse overlapping, and TFTs turn on temporarily. We detect the on current of TFTs to judge whether panel is touched or not. The proposed circuit improves the disadvantage of other active touch panels. Especially, it is hardly influenced by threshold voltage variation of TFTs. We also propose a design procedure of proposed circuit, and we design a 42-inch touch panel successfully.