標題: 改善色序法液晶顯示器畫質之互動技術
Interactive Techniques for Minimizing Color Breakup in Field Sequential Liquid Crystal Displays
作者: 吳志男
Chih-Nan Wu
鄭惟中
Wei-Chung Cheng
電機學院電子與光電學程
關鍵字: 色序法;跳視;追視;頭動;眼電圖;Color Breakup;saccade;smooth pursuit;head movement;Electro-Oculogram
公開日期: 2007
摘要: 色序法顯示器由於具有低製造成本,高光學效率、低功耗以及高解析度之優勢,已成為當今顯示技術研究的重點。然而,另一方面,因跳視(saccade)、追視(smooth pursuit)與頭動(head movement)所造成的色分離現象與色偏等問題,卻也成為色序法顯示器遲遲無法量產的技術瓶頸。本論文的重點在使用互動式技術,以抑制色序法顯示器中因眼動而產生的色分離現象。根據不同的眼動速度所造成的影像品質缺陷,由慢至快,可分為:1) 由頭動視角變化而產生之色偏現象,2) 由追視所造成之色分離現象,以及3) 由跳視所造成之色分離現象。 因應不同眼動,我們研究了以下的偵測技術: 1) 利用眼動儀偵測追視。以FPGA擷取眼動軌跡,並計算眼動速度,據以改變背光源驅動時序,以降低色分離現象。 2) 利用眼動波偵測跳視。設計並實作眼動波偵測電路,並過濾跳視行為,據以改變背光源驅動時序,以降低色分離現象。 3) 利用紅外線發射器傳送觀測者頭部位置,在顯示器端以影像感測器偵測紅外線訊號,以FPGA即時控制顯示器作即時影像處理,並動態調節背光源強度及控制液晶的穿透度,以改善因視角所產生之色偏現象,提升影像品質。 最終,本論文研究針對色序法顯示器量測並建立人眼視覺色分離模型,結合上述互動技術,達成抑制色分離現象,並保持色彩飽和度的目的。
In this thesis, three approaches are proposed for minimizing display artifacts which are induced by eye movement. From slow to fast, these artifacts are: viewing angle-dependent color shift caused by head movement, color breakup caused by smoothly pursued eye movement, and color breakup caused by saccadic eye movement. For viewing angle-dependent color shift, an infrared sensing mechanism is used to detect the head position. The LCD panel transmittance and backlights are modulated to compensate for the color shift accordingly. For pursued color breakup, an eye-tracker is used to detect the gaze velocity such that the image chroma can be reduced for suppressing color breakup at run-time. For saccadic color breakup, a custom-made electro-oculogram circuit is used to detect the events of saccadic eye movement. Finally, a platform for evaluating perceivable color breakup of human eye is proposed.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009367526
http://hdl.handle.net/11536/80081
Appears in Collections:Thesis


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