一種應用於觸控液晶顯示器的新型嵌入式開關; A New Embedded Switch for Touch Liquid Crystal Display

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题名:	一種應用於觸控液晶顯示器的新型嵌入式開關;A New Embedded Switch for Touch Liquid Crystal Display
作者:	林恆昌;Heng-chang Lin
贡献者:	電機工程研究所碩士在職專班
关键词:	液晶顯示器;觸控;嵌入式;embedded;touch;liquid crystal display
日期:	2011-07-27
上传时间:	2012-01-05 14:58:11 (UTC+8)
摘要:	近年來，液晶顯示器的觸控人機界面越來越受歡迎。讓資料輸入和系統操作上更直覺、簡易及方便。目前最普遍常見的解決方案為外掛式。其作法多是在顯示器的前方直接疊加一觸控模組。依其原理不同又可分為電容式、電阻式、光學式、電磁式、紅外線偵測等多種技術。這些是成熟的技術，就系統面而言設計簡單且容易實現。然而，外加的觸摸面板模組必需在顯示器前方加上至少一層的玻璃或薄膜。這將使畫面顯示的品質變差、對比下降，並增加整體厚度及成本。有鑑於外掛式面板的問題，新的嵌入壓感開關式觸控技術被提出。它改變了在液晶顯示器內部原有的畫素結構，並在液晶顯示器源驅動電路中加入觸控偵測電路。但以往的提案有一些已知的問題。Samsung 的提案會嚴重影響畫素開口率，並且無法實現真實多點觸控。Philips 的提案則有零觸控電流導致的觸控失效問題。在這篇論文中，我們加入第二顆薄膜電晶體到液晶顯示器的畫素結構內。其作為觸控電流掃描開關。並且改變觸控電流的路徑。藉由這樣的設計，我們可以實現真正的多點觸控輸入。並可避免可能的觸控輸入失效及顯示輸出異常的發生。 Recently years, the Human-Machine-Interface touch panel of the LCD(Liquid Crystal Display） becomes more popular. It makes data input and device operation more convenience, intuitive and simple. The most common solutions of the touch panel were plug-in types. There were added a touch panel module in front of screen directly. According to different principles and technologies, plug-in types can be classified into capacitive, resistive, optical and electromagnetic. These were mature technology, easy to design and implement. However, external touch panel modules must add at least one layer of glass or film in front of the display screen. It will make worse display quality, contrast and increase thickness and cost. In view the problems of the plug-in type panel, new embedded switch touch technology has been proposed. It change the original pixel structure inside the LCD, and add touch detection circuit into the LCD source driving circuit. But previous proposals have some known problems. Proposal of Samsung will serious impact pixel aperture ratio, and it can not achieve true multi-point touch. Proposal of Philips have possible touch failure issue because of zero touch current. In this thesis, we add second thin film transistor into the pixel structure of the LCD. It is used as a touch current scan switch, and also change touch current path. Through this design, we can realize the true multi-touch input. Also can avoid possible touch input failure, and display output failure occurred.
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