感光式觸控面板設計

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姓名

許育民(Yu-min Hsu) 查詢紙本館藏

畢業系所

電機工程學系在職專班

論文名稱

感光式觸控面板設計
(Photo sensor touch panel design)

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摘要(中)

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

摘要(英)

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.

關鍵字(中)

★ 感光元件
★ 感光元件電壓控制
★ 動態邊界值
★ 觸控面板

關鍵字(英)

★ touch panel
★ photo sensor
★ dynamic threshold
★ voltage control

論文目次

中文摘要 I
英文摘要 II
誌謝 III
目錄 IV
圖目錄 VII
表目錄 XI
第一章緒論 1
1.1 研究背景 1
1.2 觸控面板的現狀 4
1.2.1 觸控面板的分類 4
1.3 研究目標 6
1.4 本論文架構與內容 7
第二章原理與方法 8
2.1 感光式觸控面板之架構說明 8
2.1.1 顯示面板基本原理 9
2.1.2 觸控面板構造 10
2.1.3 感光元件特性 11
2.1.4 多工器(Multiplexer)基本特性 14
2.1.5 差動接收放大器(Differential Receiver Amplifier) 14
2.2 觸控面板觸控之理論說明 15
2.3 觸控偵測能力的改善方式 19
2.4 多點觸控方式 22
第三章觸控點影像處理 25
3.1 感測位置演算法架構 25
3.1.1 影像位移演算法(一) 26
3.1.2 前後畫面相減演算法(二) 27
3.1.3 動態邊界值(Dynamic Threshold Value)演算法(三) 27
3.2 觸控影像處理流程 28
3.2.1 動態邊界值計算 29
3.2.2 擴張演算法(Dilation) 29
3.2.3 侵蝕演算法(Erosion) 30
3.2.4 陰影判斷演算法(Shadow) 31
3.2.5 邊界偵測(Edge Detection) 32
3.2.6 標記演算法(Labeling Algorithm) 32
3.2.7 重心演算法(Center of Gravity) 33
第四章實驗設備及結果 34
4.1 實驗設備 34
4.2 實驗設計 35
4.2.1 硬體線路設計 35
4.2.2 感光式觸控面板之信號驅動 36
4.2.3 實驗參數設定與規格 39
4.3 觸控位置實驗偵測 40
4.4 影像演算法驗證 44
4.5 觸控位置實驗偵測 44
4.6 觸控面積大小偵測 46
4.7 觸控多點測試 48
4.8 感光元件的電壓控制 49
4.9 均勻性測試之結果 50
4.10 動態邊界值的測試 51
第五章討論 52
第六章結論 55
參考文獻 56

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指導教授

徐國鎧(Kuo-Kai Shyu)

審核日期

2008-7-20

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