觸控螢幕目前越來越流行，其應用領域逐漸從提款機、資訊查詢系等傳統固定裝置進入到個人用的小型行動裝置，例如：行動電話、數位相機、PDA及掌上型遊戲機等。自從iPhone 出現，觸控變成必備工具及未來的主流，觸控方式讓人們直覺得控制視窗上的元件，除此之外透過多點的手勢來達到特殊的控制，使整體操作上更直覺方便。iPhone 是使用真實多點的觸控螢幕，目前真實多點的觸控分為分割式電阻、投射式電容及光學三種，其中iPhone是使用投射式電容；電容式的優點是透光度高及反應快速，它的缺點是耗電及只能手指觸碰，電阻式優點是重量輕、厚度薄、消耗電力少、可筆輸入及價格低，但是缺點是透光度比電容式差及需要壓力才能感應，不過這兩項缺點已慢慢的被面板廠改進。多點輸入最好的應用是透過兩點的手勢快速達到特殊的功能，但是為了這個原因而用多點輸入的硬體其實是很浪費的。
四線式電阻面板是電阻式最便宜且最為普及的面板，但是它的物理限制，只能使用單點輸入；本論文將介紹如何改善四線式電阻的限制，讓它也能接受兩點的手勢，我們定義三種手勢：縮放、旋轉及平移三種手勢，這裡會說明整個系統架構，包含硬體電路、韌體及驅動程式，並且收集兩點手勢的連續訊號，利用數理統計的方法來識別訊號及分析出手勢。於實驗的過程裡，我們收集了4個人的手勢資料，每種手勢重複3次，共 72 筆資料用來驗證辨識的演算法，當中48筆旋轉及平移的辨識率達到100%，而12筆放大手勢有2筆識別成縮小，且12筆縮小手勢有1筆識別成放大，經過分析後找出錯誤原因，再請測試者重新操作之後辨識便正確無誤。截至目前為止，實驗結果令人滿意，我們將它應用在實際的產品裡，譬如圖型瀏覽和Google Map，都有驚歎的表現。

Touch screen is more popular nowadays; moreover, used in ATM, Information inquiry system into personal mobile device. The popularity of smart phone, digital camera, personal digital assistant (PDA), portable video game consoles and many types of information appliances is driving the demand and acceptance of common touchscreens. From iPhone appears, touch has become the tool of future stream. Touch panel can be used touch directly and in the other way make people feel more convenient through gesture. Gestures are considered as one or two fingers touch inputs that translate into some kind of predefined action (gesture) that the user performs. There are four parts of touch panels: resistive, capacitive, surface acoustic wave and optical, they are used in Pad resistive and capacitive. Resistive type touchscreen is light and thin-film and power consumption less and can accept stylus or gloved input. The shortcoming is transmittance not good and need the press to detect. Capacitive is the opposite of resistive, its shortcoming is weight high, power consumption high and only accept finger touch. The advantage is good transmission, reliability and response. Lightweight and low power consumption of mobile phone and PDA are very important so resistive touchscreen is better.
True multi-touch touchscreen is included panel and controller, the price of resistive and capacitive are higher than typical 4-wire resistive. We analyze the most convenient function of true multi-touch is through gesture to control, users can direct touch panel to interact with computer through the gesture of two fingers.

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