傳統外貼電阻式(Resistive)或電容式(Capacitance)觸控面板在工業上和娛樂上已經成為一種很普遍的應用。本論文提出一套將感光元件整合到一般顯示器當中的做法，其觸控媒介是靠有觸碰和沒有觸碰所造成亮度改變，透過感光元件的感測、類比/數位轉換(A/D Converter)就可以得到不同的數位信號變化，在經過影像處理演算法計算得到觸摸點X/Y座標。 因觸控的媒介是靠亮度的改變達到感測的作用，所以影子將會使感光式觸控面板產生誤動作，和在暗態的環境當中，造成觸控面板無動作的問題。 我們提出動態邊界值(Dynamic Threshold)的控制和感光元件的電壓(VGS)控制的方法和影像演算法，解決上述所遇到的問題，利用感測元件所偵測到的值，經過計算之後適當調整邊界值和感測元件的VGS電壓，將有效解決因陰影產生誤判，和環境亮度改變造成觸控面板誤動作的情形。 關鍵詞︰觸控面板、感光元件、動態邊界值、感光元件電壓控制 The Resistor or Capacitor touch screen have become popular in displays for industrial and amusing applications. We provide new method to integrate photo sensor in display panel. The touch function work or not base on touch or un-touch that will change brightness value, through the sensing by photo sensor and A/D converter, we can obtain different digital signal variation, and processing by image algorithm calculating, we can obtain the result for X/Y coordinates. Because the sensing function base on brightness change, so the shadow will cause function error for photo sensor touch panel and no function in very dark of environment. We will provide the new dynamic threshold and VGS voltage control method and algorithm processing that can solve these issues. Use the sensing value by photo sensor and adjust the threshold value suitably and photo sensor VGS voltage that effectives solve function error cause by shadow and the touch no function cause brightness change issues. Keywords : touch panel, photo sensor, dynamic threshold, photo sensor voltage control.
