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研究生: 劉書呈
論文名稱: 電泳式顯示器之視訊影像驅動設計
Signal Processing for Playing Videos on Electrophoretic Displays
指導教授: 高文忠
Kao, Wen-Chung
學位類別: 碩士
Master
系所名稱: 電機工程學系
Department of Electrical Engineering
論文出版年: 2013
畢業學年度: 101
語文別: 中文
論文頁數: 83
中文關鍵詞: 電泳式顯示器電子紙視訊影像
英文關鍵詞: Electrophoretic display (EPD), E-paper, Video
論文種類: 學術論文
相關次數: 點閱:171下載:27
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  •   電泳式顯示器(EPD)擁有雙穩態、寬視角等特性,容易在任何光源下閱讀,因此非常適合應用於電子閱讀器(E-Readers)的顯示螢幕。目前電泳式顯示器顯示靜止圖像的方法已經有很好的研究結果,但是如何在電泳式顯示器播放視訊影像還是一個很大的挑戰,這是因為電泳式顯示器的反應速度比液晶顯示器低很多,至今,還沒有任何電子閱讀器可以流暢播放視訊影像。

      本論文設計一套影像處理軟體,用於最佳化EPD播放視訊影像,分析在連續frames之每個像素的變化,根據連續frames之間的每個像素之停滯時間的時間參數進行補償,最後再將影像驅動的資訊及記錄著驅動正負電壓的持續時間的資訊送入EPD系統內,該軟體可自動最佳化指定播放速率下的播放效果。此外我們設計了擾動波形,改善驅動視訊影像時所產生的擴散問題,並使用影像處理技術,使電泳式顯示器可播放較複雜的灰階影像。

    The electrophoretic display (EPD) has been popularly applied on electronic readers (E-Readers), but its response time is still a bottleneck such that none of commercial E-Readers can play videos on the EPD smoothly. In this paper, the detailed issues regarding the response time of the EPD are well addressed. An image processing tool based on the measured response speed under different image retention time has been proposed. Although the response time of the EPD is still lower than liquid crystal displays, the tool can automatically optimize the video quality under the specified data frame rate. In addition, we also design alternative approach which solves the problem of pixel diffusion by giving a pre-shaking the all unchanged pixel.

    中文摘要 i 英文摘要 ii 誌  謝 iii 目  錄 iv 圖 目 錄 vii 第一章 緒論 1 1.1  研究動機與背景 1 1.2  相關研究概述 4 1.3  本篇提出對電泳式顯示器之視訊影像驅動方法 5 1.4  本文架構 6 第二章 相關研究探討 7 2.1  電泳式顯示器相關技術 7 2.1.1 傳統型(垂直式)電泳式顯示器 8 2.1.2 水平式(橫向式)電泳式顯示器 10 2.1.3 Electrokinetic電泳式顯示器 11 2.1.4 液粉式電泳式顯示器 12 2.2  電泳式顯示器之反應特性 13 2.3  電泳式顯示器之驅動波形與系統相關之研究 17 2.4  影像處理相關研究 22 2.4.1 色彩空間 22 2.4.2 半色調技術 26 第三章 電泳式顯示器之光學反應相關特性研究 29 3.1  粒子停留與驅動關係之實驗 30 3.1.1 由白驅動至黑狀態(Toff)之停留時間對顯示的影響 30 3.1.2 由黑驅動至白狀態(Ton)之停留時間對顯示的影響 32 3.1.3 實驗結果 34 3.2  電泳式顯示器粒子與TFT電場驅動問題 35 第四章 驅動波形設計 39 4.1  參考停留時間之二階視訊影像驅動波形 39 4.2  半色調視訊影像驅動波形 43 4.2.1 實驗結果 46 4.3  系統波形設計 47 第五章 影像處理軟體設計 52 5.1  黑白二階視訊影像 52 5.2  半色調視訊影像 53 5.3  演算法輸出結果 58 第六章 研究成果 61 6.1  實際系統架構 61 6.2  實際播放視訊影像的結果 62 6.2.1 黑白二階視訊影像 62 6.2.2 半色調視訊影像 67 第七章 結論 74 參 考 文 獻 76 自  傳 79 學 術 成 就 83

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