利用脈衝重疊偵測之主動觸控面板的研究

Study on Active Touch Panel Using Pulse Overlapping Detection

林寬達(Kuan-Ta Lin)

指導教授 ： 戴亞翔

國立交通大學/電機學院/顯示科技研究所/碩士(2011年)

https://doi.org/10.6842/NCTU.2011.00231

摘要

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。

關鍵字

觸控面板 ； 主動式 ； 非晶矽薄膜電晶體 ； 氧化銦鎵鋅薄膜電晶體 ； 時間常數

並列摘要

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.

並列關鍵字

touch panel ； active matrix ； a-Si TFT ； IGZO TFT ； time constant

參考文獻

[1] Bong Hyun You1, Byoung Jun Lee1, Jae Hoon Lee,“LCD Embedded Hybrid Touch Screen Panel Based on a-Si:H TFT,” Society For Information Display, vol.40, no.32, pp. 439-442, 2009.

[2] Cheol-Se Kim, Byung Koo Kang, Ji Hyun Jung,“Active Matrix Touch Sensor Perceiving Liquid Crystal Capacitance with Amorphous Silicon Thin Film Transistors ,” Japanese Journal of Applied Physics, vol.49, pp. 03CC03-1 – 03CC03-4, 2010.

[3] Eiji Kanda, Tsukasa Eguchi, Yasunori Hiyoshi,“ Integrated Active Matrix Capacitive Sensors for Touch Panel LTPS-TFT LCDs,” Society For Information Display, vol.39, no.55, pp. 834-837, 2008.

[5] Hyun-Sang Park, Yong-Jin Kim, Min-Koo Han,“Touch-Sensitive Active-Matrix Display with Liquid-Crystal Capacitance Detector Arrays,” Japanese Journal of Applied Physics, vol.49, pp. 03CC01-1 – 03CC01-7, 2010.

integrated into 12.1-in. a-Si:H TFT-LCD,” Society For Information Display, vol.17, no.12, pp. 87-94, 2009.