• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1010-1013
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• 2006

To understand the exact charge carrier photogeneration properties of photoactive thin films consisting of a ${\pi}-conjugated$ polymer matrix and a triplet dopant, we prepared two types of polymer, poly(9-vinylcarbazole) (PVK) and poly[9,9-bis(2- ethylhexyl)fluorene-2,7-diyl] (PF2/6) doped with triplet emitters for organic light-emitting diodes (OLED), either iridium(III)fac-tris(2-phenylpyridine) $(Ir(ppy)_3)$ or iridium(III)bis[(4,6-fluorophenyl)- $pyridinato-N,C^2'$]picolinate (FIrpic), as thin film devices by using the conventional method. Those doped film devices, as well as pristine film devices, on ITO substrates were characterized by means of steady state photocurrent measurement for a wide spectral range.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.133-138
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• 2008

Since the invention of 'the Stereoscope' in 1838, many kinds of 3D display systems have been developed and used for various applications. In fact they have been at least proposed for virtually every application that uses 2D displays. In this paper, we introduce the various 3D display techniques and its products.

• Current Optics and Photonics
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• 제7권6호
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• pp.597-607
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• 2023

Volumetric 3D displays generate voxels to enable users to watch three-dimensional virtual objects from various angles, and they have a significant advantage over other types of 3D displays in terms of realism and the absence of vergence-accommodation conflict (VAC). By virtue of these advantages, various volumetric 3D display technologies incorporating novel approaches have been introduced competitively. As a result, the conventional classification criteria for volumetric 3D technology often fall short in categorizing these innovative methods. In this study, we present an improved classification framework capable of accommodating these new technologies. We expect that a new classification may offer some intuition to identify areas of technical deficiency and contribute to improving the technology.

• 전자통신동향분석
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• 제35권4호
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• pp.65-80
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• 2020

In this article, we review the study trends of three-dimensional (3D) displays that can display stereoscopic images from the perspective of a display device. 3D display technology can be divided into light field, holographic, and volume displays. Light field display is a display that can reproduce the intensity and direction of light or 'ray' in each pixel. It can display stereoscopic images with less information than a holographic display and does not require coherence of the light source. Therefore, it is expected that it will be commercialized before the holographic display. Meanwhile, the holographic display creates a stereoscopic image by completely reproducing the wavefront of an image using diffraction in terms of wave characteristics of light. This technology is considered to be able to obtain the most complete stereoscopic image, and the digital holographic display using a spatial light modulator (SLM) is expected to be the ultimate stereoscopic display. However, the digital holographic display still experiences the problem of a narrow viewing angle due to the finite pixel pitch of the SLM. Therefore, various attempts have been made at solving this problem. Volumetric display is a technology that directly creates a stereoscopic image by forming a spatial pixel, which is known as a volumetric pixel, in a physical space, and has a significant advantage in that it can easily solve the problem of the viewing angle. This technology has already been tested for commercial purposes by several leading companies. In this paper, we will examine recent research trends regarding these 3D displays and near-eye display that is emerging as a significant application field of these technologies.

• 동굴
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• 제75호
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• pp.21-33
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• 2006

Yangdan Cave displays as a Vadose Cave rathre than a Phreatic Cave due to its fluvial activated ramnants of the cave beds and walls. Geochemistry experiments of the speleothem (stalactite and stalagmite)were generated in order to find out the cave material characteristics using XRD. The results present that the composition of the cave materials consists of Calcite, Dolomite, Quartz, K, K-Feldspar. Plagioclasc, Illite, and Kaolinite. These materials commonly exhibited less mineral composition than other caves. In terms of calcite compostion of the cave the upper cave materials (d=3.049) contain less than lower cave materials (d=3.055). Finally the calcite compostion of the cave materials between stalactite (d=3.055) and stalagmite (d=3.054) displays simillar values.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.763-764
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• 2008

3D displays requires multiplexing of left and right pictures on the same screen so that they can be viewed independently by the view using various schemes, including LCD shutters, polarizers, narrow band filters, and lenticular lenses on the screen. All these methods reduce the effective screen brightness by as much as 10X. The eye responses to the lower brightness are analyzed and found to compensate partially giving a lower perceived brightness. This paper presents such eye response analysis and a low cost approach to increasing brightness in a RPTV using the long life DPR system, increasing the screen brightness by over 2.5 times, while maintaining acceptable lamp lifetime.

• Journal of Information Display
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• 제3권4호
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• pp.19-22
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• 2002

In this paper, we introduce an efficient three-dimensional magnetic field mapping system for a Deflection Yoke (DY) in Cathode-Ray Tube (CRT). A three-axis Hall probe mounted in a small cylindrical bar and three-stepping motors placed in a non-magnetic frame were utilized for the mapping. Prior to the mapping starts, the inner contour of DY was measured by a laser sensor to make a look-up table for inner shape of DY. Three-axis magnetic fields are then digitized by a three-dimensional Hall probe. The results of the mapping can be transformed into various output formats such as multi pole harmonics of magnetic fields. Field shape in one, two and three- dimensional spaces can also be displayed. In this paper, we present the features of this mapping device and some analysis results.

• 방송공학회논문지
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• 제18권3호
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• pp.425-434
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• 2013

3D 디스플레이를 통해 입체감을 느낄 때에는 현실세계에서 입체감을 느낄 때와는 다르게 피로를 느끼게 된다. 이러한 피로에 대해 안경식 3D 디스플레이를 사용한 연구는 많았지만 무안경식 3D에 대한 연구는 아직까지 미비한 실정이다. i3D시스템이란 interactive 3D 시스템의 약자로 사용자가 간단한 손동작 등으로 콘텐츠와 협응이 가능하도록 제작한 무안경식 3D 디스플레이 시스템을 말한다. 본 연구에서는 현재 시연용으로 구현되어 있는 i3D시스템을 이용하여 이 시스템을 사용하는 다양한 시청 환경에서의 시각 피로를 측정하였다. 그 결과 시청거리가 멀어질수록 낮은 피로를 보였으며 시차가 작을수록 낮은 피로를 보였다. 시청각도의 경우 3D 입체상이 안정적으로 지각되지 않는 시청각도에서 높은 피로를 느끼는 것으로 나타났다. 또한 시청거리와 시청각도간의 상호작용 효과를 볼 수 있었는데, 3D가 안정적으로 지각되었을 때의 시청각도에서는 시청거리에 따라서 피로도가 감소하는 것을 보였으나 안정적인 3D지각이 되지 않았을 때의 시청각도에서는 거리에 따른 피로도의 차이가 없었다. 이러한 결과는 무안경식 3D 디스플레이와 i3D 시스템 개발에 있어 최적의 사용자 경험을 위한 중요한 자료이다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1996년도 Proceedings International Workshop on New Video Media Technology
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• pp.35-40
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• 1996

In this paper, a method for 3-D surface reconstruction with two real cameras is presented. The method, which combines the extraction of binocular disparity and its interpolation can be applied to the synthesis of images from virtual viewpoints. The synthesized virtual images are as natural as the real images even when we observe the images as stereoscopic images. The method opens up many applications, such as synthesizing input images for multi-viewpoint 3-D displays, enhancing the depth impression in 2-D images and so on. We also have developed a video-rate stereo machine able to obtain binocular disparity in 1/30 sec with two cameras. We show the performance of the machine.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.780-783
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• 2008

Low-loss optical films can be used in LCD backlights to improve the display efficiency. Improvements can be used to enhance display performance, increase functionality and reduce energy costs.