• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.29-32
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• 2007

We analyzed the effect of cell resolution on the luminous efficacy through three-dimensional numerical simulation to understand the inherent discharge mechanism change in the plasma display panel. As the resolution increases from VGA to Full HD, the luminous efficacy decreases. With higher Xe content, VUV generation efficacy of Full HD becomes much lower than those of VGA or XGA cells, due to the increased plasma loss and lower electron heating. However a long electrode gap $140{\mu}m$ in Full HD cell with Ne-Xe [20%] results in the high luminous efficacy comparable to that of the XGA cell with $60{\mu}m$ gap. When comparing the effects of Xe content variation on the luminous efficacy of two different subpixel types, i. e., SDE (Segmented electrode in Delta color arrayed, Enclosed subpixel) [1] and conventional stripe barrier type in the XGA and Full HD cells, the luminous efficacy of SDE structure shows higher improvement in Full HD resolution compared with that of conventional type XGA cell, whose cause is identified as the reduced plasma loss.

• Proceedings of the IEEK Conference
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• 2000.11d
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• pp.243-246
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• 2000

Recently, PC monitor users have been replacing cathode ray tubes (CRT) with liquid crystal displays (LCD). But the chromaticity of the primaries are dependent on RGB input signals. And the colorimetry of LCD changes with gray scale and has a poor peformance in color reproduction. In this paper we propose the enhanced algorithm of color reproduction considering color leakage error and black subpixel error in LCD. In order to test peformance of this algorithm we use the colors of Macbeth colorcheck. As a result of experiments, it was confirmed that the color difference of the LCD using the proposed algorithm was considerably reduced.

• Proceedings of the Korea Multimedia Society Conference
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• 1998.04a
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• pp.205-209
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• 1998

시각암호는 n개로 분산된 비밀화상을 슬라이드와 같이 물리적으로 중첩 가능한 곳에 인쇄하여 그룹내 n명에게 슬라이드를 배포한 후, 임의의 k명 이상의 슬라이드를 겹치면 비밀 화상을 복원할 수 있지만, k-1명 이하의 슬라이드를 겹치는 경우에는 비밀화상을 복원할 수 없는 방식이다. 이 논문에서는 (k, n) 시각암호의 휘도(contrast)를 개선하기 위한 구성법에서 모든 경우에 동일 휘도를 유지하면서 부화소의 수를 줄이기 위한 새로운 구성법을 제안한다.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.867-872
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• 2005

High-pixel-density displays are now under development to meet the needs of next-generation mobile devices; methods to more efficiently build such displays are described. Displays based on subpixel rendering and RGBW technologies, known as PenTile $Matrix^{TM}$ RGBW, are shown to offer the best approach to meeting the demanding requirements of low manufacturing cost, high brightness, and low power.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.53-56
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• 2002

Samsung's newly developed high luminance efficiency 42" VGA plasma display panel is introduced. A new discharge cell structure, SDR (Segmented electrode in Delta color arrayed Rectangular subpixel) has been applied to a full size panel for the first time. In this paper, we describe how this new discharge cell structure for high efficiency is integrated to an energy saving plasma display with better picture quality.

• Journal of the Korean Society for Precision Engineering
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• v.15 no.6
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• pp.116-123
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• 1998

An interferometric microscope with an improved lateral resolution is presented. The nanometer resolution XY stage is integrated into standard temporal phase shifting interferometer. The nanometer resolution XY stage is used to position specimen in subpixel of CCD detector, therefore CCD detector's sampling is improved. Two scanning algorithms and those simulation results are also presented. The simulation results show that scanning algorithms improve CCD detector's sampling significantly, and interferometeric microscope's lateral resolution is improved also.

• Journal of Korea Society of Industrial Information Systems
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• v.1 no.1
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• pp.111-125
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• 1996

This paper presents a statistical process control(SPC) system in the electronic parts manufacturing process. In this system, an SPC method is integrated into the automated inspection technology on a real time base. It shows how the collected data can be analyzed with the SPC to provide process information. also presented are stuided of subpixel image processing technology to improve the accuracy of parts mearements , and the cumulative-sum(CUSUM) control chart for fraction defectives.An application of the developed system to connector manufacturing process as a part of computer integrated manufacturing (CIM) is presented.

• Proceedings of the KIEE Conference
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• 2000.07c
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• pp.2198-2200
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• 2000

This paper reports on the measurement of angle between micro mirror and substrate in. the Micro Optical Cross Connect(MOXC). MOXC consists of beam collimators and $N{\times}N$ micro mirrors that are fabricated by using MEMS technology. Using subpixel level image processing, it is possible to measure the angle with the resolution of 0.27$^{\circ}$.

• Journal of Korean Society for Geospatial Information Science
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• v.3 no.2 s.6
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• pp.159-172
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• 1995

This study aims to apply digital photogrammetric methods on the close range photogrammetry. To get a three dimensional position with digital photogrammetric method, scanning, image matching, and bundle adjustment are performed. Comparing the three dimensional position computed by digital photogrammetric methods with ground survey values, the errors can be detected. Analyzing the errors, it is possible to present a new digital photogrammetric method for the close range photogrammetry. Image matching method used in this study is area-based pixel unit and subpixel unit method. As a result of the study, three dimensional position error is 3.32mm and the error in the single coordinate axis direction is 0.76mm in pixel unit and in subpixel unit, respective error is 3.98mm and 0.73mm.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.1103-1107
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• 2004

Last year, we introduced a TFT-LCD with RGBW color system. The primary advantage of the RGBW system is that its optical efficiency is at least 50% higher than the RGB system. However, it is not a simple task to incorporate the new color system into the infrastructure of the RGB system: the driving circuitry, fabrication of color filter, and color conversion. In this report, the practical hurdles are discussed and the solutions are presented.