Focus tunable integral imaging AR display using electrowetting liquid lens array전기습윤 액체 렌즈 어레이를 이용한 초점가변 집적영상 AR 디스플레이

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The three-dimensional display is implemented in a variety of ways, including polarizing, shutter glass, lenticular lens, HOE, and lens array, to provide stereoscopic images to viewers. Most three-dimensional displays bring problems such as headaches, visual fatigue and dizziness. A person uses two different types of depth information, which are vergence and accommodation. The brain feels unnatural when given vergence and accommodation data shows different depth information. This is called vergence-accommodation conflict(VAC) and this problem should be solved to provide more natural stereoscopic images. This VAC problem also occurs in Virtual Reality(VR) and Augmented Reality(AR) displays and is very serious due to the user’s high concentration. Solutions for this problem are being tried in many directions. Among them, the method of using integral imaging system into AR is currently tried, which allows the provision of natural and comfortable stereoscopic images due to the characteristics of integral imaging without VAC problems. However, the limitation of depth range, a disadvantage of integral imaging, is also maintained and should be solved. In this dissertation, the aim is to fabricate the electrowetting microlens array and apply them to integral imaging based augmented reality display devices. In order to increase the depth range of integral imaging display, the lens array with variable focal length is required. The electrowetting is a technique that varies the surface tension of fluids through and applied voltage and it can be used in a small-sized element. For proposed AR integral imaging display, a lens array with a small pith of about 1mm is required and this focus variable lens array is fabricated through electrowetting method. As a result, the lens pitch 1mm, the overall size 14 $\times$ 10mm, the wall thickness 100um, the fill factor 73%, the variable range -542~-89D, the response time 13.3ms, optical aberration less than 0.1, and operation voltage 0~60V is fabricated and applied to the proposed integral imaging AR system. Combining microdisplay panel, electrowetting microlens array, solid microlens array, and eyepiece lens, the focus tunable integral imaging system is conducted on the optical table and the characteristics of this system are tested. Finally, it has a total variable dioptric power of 49~241D and 100% fill factor, which extends the depth range to 20~100cm from original 50~70cm with conventional passive element system. The fabricated display system has 266 $\times$ 200 resolution in a 30cm central depth plane(CDP) and 133 $\times$ 100 resolution in a 90cm CDP and has a viewing angle of about $32.3^\circ$. With configured AR setup, the image test was carried out. Finally, in combination with PC and eye-tracking camera, a focus tunable integral imaging system which recognizes currently being viewed objects and automatically adjusts focus at the same position to provide a clear image at all times.
Advisors
Won, Yong Hyubresearcher원용협researcher
Description
한국과학기술원 :전기및전자공학부,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전기및전자공학부, 2020.2,[vi, 70 p. :]

Keywords

augmented reality (AR)▼aintegral imaging▼aelectrowetting▼aliquid lens▼amicrolens array; 증강현실 (AR)▼a집적영상▼a전기습윤▼a액체 렌즈▼a마이크로 렌즈

URI
http://hdl.handle.net/10203/284201
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=909435&flag=dissertation
Appears in Collection
EE-Theses_Ph.D.(박사논문)
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