周元昉臺灣大學:機械工程學研究所江冠樺Chiang, Kuan-HuaKuan-HuaChiang2010-06-302018-06-282010-06-302018-06-282008U0001-2108200810482200http://ntur.lib.ntu.edu.tw//handle/246246/187387觸控面板因為人性化介面及使用上的便利性，應用的範圍及層面有增加的趨勢，常用的觸控面板有電阻式、電容式、光學式、表面聲波式觸控面板，目前中小型的觸控面板發展已經非常成熟，並在手持式裝備上有非常好的應用，而大型的觸控面板的技術並沒有中小型觸控面板如此成熟，具有很大的發展潛力。文的目的在於研發新的超大型觸控銀幕架構，觸控銀幕架構使用四顆超音波接收轉能器及一個超音波發射轉能器，四顆超音波接收轉能器分別置於銀幕的四角，利用安裝在觸控筆上的超音波發射轉能器發射超音波，四角的超音波接收器接收訊號來得到觸碰點與四角的距離，再經由微控制器處理計算出觸碰點的座標，之後將座標數據回傳到電腦就可以使電腦的游標與觸控筆連動，由於超音波測距有誤差存在，因此本文利用類神經網路來計算觸碰點的座標，即使測距有微小誤差，藉由類神經網路計算座標也能有一定的準確度。而本文實作結果已成功證實使用此架構配合類神經網路計算觸碰點的座標的可行性。Contributing to the user-friendly convenience, touch panel has been inclined to increase in the range and layer of application. The touch panels in common use include resistive, capacitive, infrared and SAW forms. Currently the development in medium and small touch panel has already been significantly mature, moreover, applied so well in portable equipments. However, the technology of large sized touch panel is not as mature as the medium and small sized touch panel, which consists of immense potential.his discourse aims at innovating new ultra-large sized touch screen structure. The touch screen structure utilizes four ultrasonic receiving transducers and an ultrasonic transmitting transducer. The four ultrasonic receiving transducers are located on the four corners of the screen respectively. By transmitting the ultrasound from the ultrasonic transmitting transducer attached to the touch pen, the ultrasonic receiving transducer on the four corners can receive the signals in consequence of acquiring the distance between the touch point and the four corners. Simultaneously, computed through microcontroller to access the coordinate, the data will be delivered backward to the computer so that the cursor can connect to the touch pen. Owing to the errors existing in ultrasonic measurement, neural network is substituted to calculate the coordinate of touch point in this text. Although some minute errors are inevitable, the calculation through neural network still demonstrates certain accuracy. As a result, the practical experiment had been successfully proved that the cooperation of the structure and neural network is available for computing the coordinate of the touch point.中文摘要 ibstract ii錄 iv目錄 vi目錄 vii號表 ix一章 緒論 1.1 前言 1.2 觸控面板的種類與原理 1.2.1 電阻式 1.2.2 電容式 2.2.3 光學式 2.2.4 表面聲波式 2.3 本文目的與內容 3二章 類神經網路 4.1 類神經網路簡介 4.2 倒傳遞類神經網路 6.3 Levenberg-marquardt演算法 12三章 觸控銀幕系統 18.1 倒傳遞類神經網路於本系統的應用 18.2 觸控銀幕架構與運作方式 19.2.1 觸碰點到接收端之距離為網路輸入 19.2.2 觸碰點到接收端之距離差為網路輸入 20.3 超音波測距電路 20.3.1 超音波轉能器 20.3.2 發射電路 21.3.3 接收電路 21.4 微控制器 22.4.1 處理流程 22.4.2 三位元組浮點數格式 24.4.3 活化函數轉換 25四章 網路訓練與實作結果 26.1 建構類神經網路 26.1.1 比較基本型倒傳遞演算法與LM倒傳遞演算法的效能 26.1.2 選擇活化函數 27.1.3 決定網路大小 27.2 觸控銀幕系統實作 28.2.1 取點與網路訓練 28.2.2 使用距離差為網路輸入 29.2.3 結果討論 30五章 結論與建議 31考文獻 32表 33圖 37錄 602192791 bytesapplication/pdfen-US觸控面板觸控銀幕類神經網路超音波touchscreenultrasonicneuralnetworkthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/187387/1/ntu-97-R95522823-1.pdf