曲面元件於近眼光場顯示器之視場角分析

Analysis of the Field of View in Near-Eye Light Field Displays with Curved Optical Components

林庭萱(Ting-Hsuan Lin)

指導教授 ： 黃乙白 ； 田仲豪

國立交通大學/電機學院/光電工程系所/碩士(2020年)

摘要

隨著科技的發展，有愈來愈多虛擬實境(VR)與擴增實境(AR)相關的研究與產品問世，這兩種科技得以結合現實世界與虛擬物件。傳統的立體顯示器擁有不錯的立體效果，但因視覺輻輳調節衝突所造成的影響，若使用時間拉長，容易產生暈眩、噁心、噁吐感等不適症狀，幸運的是，運用微透鏡陣列的光場近眼顯示器可以解決此問題。典型的光場虛擬實境顯示器以每顆眼球對應一組透鏡陣列，每組透鏡陣列可產生一組光場影像，光場影像再於視網膜上重處成一個影像。目前已有許多平面顯示器搭載平面透鏡陣列的研究，然而此架構的視場角並不大，而且在大角度視野處的影像解析度不佳，相較於平面元件的架構，一般相信搭載曲面透鏡陣列的光場近眼顯示器可以有效擴增視場角並改善大視角下的解析度問題，故在本研究中，致力於探討搭載曲面元件的近眼光場顯示器的模擬結果分析。首先提出一套曲面成像演算法，利用此演算法運算影像後生成積分影像圖，再將其輸入使用LightTools所建的曲面光場顯示器模型，與平面元件的結果進行比較與分析。

關鍵字

近眼光場 ； 曲面元件 ； 視場角

並列摘要

As the development of the technology, there are more and more research and products for virtual reality (VR) and augmented reality (AR). These two kinds of technology can connect real world and virtual concepts. Traditional 3D displays have a great depth effect through stereoscopic images, but making the observer having visual fatigue due to the mismatch between accommodation and convergence, which is called vergence-accommodation conflict (V.A.C.). Fortunately, light field near-eye display (LFNED) using a micro‐lens array has been developed to achieve thin structure and solve the issue of V.A.C. Typical light field virtual reality display is comprised of a lens array and a display for each eye. Each lenslet on the lens array carry an elemental image showing on the display panel. Through the overlapping field of elemental images by each lenslet, the projected images on retina forms a light field virtual image. Although the light field near-eye display with the flat structure of optical elements has been developed, it still has some problem of the small field of view, ray aberration at large field angle. Contrary to the flat lens array and flat display used in current light field displays, it’s believed that the design of combining a curved lens array and curved display can enhance the image quality in large field of view. First, a ray tracing algorithm is developed in thesis to create an integral image based on the curve lens array. Second, the image is put into a simulated model created by LightTools with a curved lens and a curved display. The design of placing lens array on a spherical surface is investigated and the analysis of the image quality are shown.

並列關鍵字

Near-Eye Light Field Displays ； Curved Optical Components ； the Field of View

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