• Title/Summary/Keyword: device characterization

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Influence of Silicon and Seed Particles on the Reconstruction Characteristics and Exaggerated Grain Growth of MgO Protective Layer by Over-Frequency Accelerated Discharge in ACPDPs

  • Kwon, Sang-Koo;Kim, Jeong-Ho;Moon, Seung-Kyu;Choi, Jong-Kwon;Park, Kyu-Ho;Han, Sung-Su
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.957-960
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    • 2008
  • The influences of silicon and MgO seed particle on the reconstruction characteristics of MgO protective layer were investigated to clarify the mechanism of reconstruction and exaggerated grain growth (EGG) in AC-PDP. The reconstruction and EGG are closely correlated with the driving force for nucleation and growth, interface energy and initial size distribution of MgO protective layer in plasma space during discharge in AC-PDP.

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A Study on the Color Management using sRGB Standard Color Space (sRGB 표준색공간을 이용한 컬러매니지먼트에 관한 연구)

  • Kim, Dong-Koun;Cho, Ga-Ram;Koo, Chul-Whoi
    • Journal of the Korean Graphic Arts Communication Society
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    • v.23 no.1
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    • pp.37-51
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    • 2005
  • The solution way of color difference in display device is using a device profile recorded with color dimension, color properties of each device and is using sRGB color space. The color matching is better sRGB than RGB color space. The sRGB is independent device color space and based on the monitor characteristice. An accurate characterization of the display device is essential for color matching. The calibration and characterization process in display device is needed to transform the device dependent color to the device independent color. The process of characterization performs a linerizaiton and transforms the linearized values into the CIE XYZ tristimulus values. The purposes of this paper is to estimate color reproduction using device profile and to explain the propriety of transformation method using variable.

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Reconstruction Characteristics of MgO (111) Textured Protective Layer by Over-Frequency Accelerated Discharge in AC Plasma Display Pannel

  • Kwon, Sang-Koo;Kim, Jeong-Ho;Moon, Seung-Kyu;Kim, Hyun-Ha;Park, Kyu-Ho;Kim, Sung-Tae
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08a
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    • pp.224-227
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    • 2007
  • The reconstruction characteristics of MgO (111) textured protective layer by over-frequency accelerated discharge in AC-PDP were investigated and correlated to the variations of electronic structures. The reconstruction process and exaggerated grain growth (EGG) were explained by defect-assisted 2-D nucleation and growth mechanism combined with charged cluster model.

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Characterization Method and Color Matching Technology for Mobile Display (모바일 디스플레이를 위한 특성화 방법과 색 정합 기술)

  • Park Kee-Hyun;Ha Yeong-Ho;Lee Cheol-Hee
    • Journal of Korea Multimedia Society
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    • v.9 no.4
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    • pp.434-442
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    • 2006
  • This paper proposes a color-matching 3D look-up table that simplifies the complex color-matching procedure between a monitor and a mobile display device, where the image colors are processed in a device-independent color space, such as CIEXYZ or CIELAB, and gamut mapping performed to compensate the gamut difference. The transform from a device-dependent RGB color space to a device-independent color space is implemented by performing display characterization. The mobile LCD characterization error using the S-curve model is larger than the tolerance error since the mobile LCD has the channel-chromaticity-inconstancy and channel-dependence characteristics. In this paper we reduced the characterization error using the electro-optical transfer functions of X, Y, and Z value for R, G, B, C, M, Y, K components. Experimental results demonstrated that 64 ($4{\times}4{\times}4$) was the smallest size of color-matching look-up table that could produce an image with an acceptable reproduction error, based on a comparison of color-matched images resulting from the proposed color-matching look-up table and complex step-by-step color-matching procedures.

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$CIEL^{*}a^{*}b^{*}$-CMY nonlinear color transformation based on equi-visual perception color sampling (등시지각 색 샘플링에 기반한 $CIEL^{*}a^{*}b^{*}$-CMY로의 비선형 색변환)

  • 류승민;오현수;이철희;유미옥;최환언;안석출
    • Journal of the Korean Graphic Arts Communication Society
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    • v.18 no.1
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    • pp.103-112
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    • 2000
  • The color space transformation to link device-dependent color spaces and device-independent color spaces is essential for device characterization and cross-media color reproduction. There are various color conversion methods such as regression, 3D interpolation with LUT(look-up table), and neural network. In the color transformation with these methods, the conversion accuracy is essentially based on the sample data to be exploited for device characterization. In conventional method, color samples are uniformly selected in device-dependent space such as CMY and RGB. However, distribution of these color samples is very non-uniform in device-independent color space such as CIEL*a*b*. Accordingly, the conversion error in device-independent color space is irregular according to the distribution of the samples. In this paper, a color sampling method based on equi-visual perception is proposed to obtain approximate uniform color samples in CIEL*a*b* space. In order to evaluate transformation accuracy of proposed method, color space transformations are simulated using regression, 3D interpolation with LUT and neural network techniques, respectively.

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A Study on the Color Reproduction Characteristic of Original Copy in Display Device (디스플레이 장치에서 인쇄원고의 컬러 재현특성에 관한 연구)

  • Cho, Ga-Ram;Koo, Chul-Whoi
    • Journal of the Korean Graphic Arts Communication Society
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    • v.23 no.1
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    • pp.65-75
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    • 2005
  • An accurate characterization of the display device is essential for better color matching. The calibration and characterization process in display device is needed to transform the device dependent color to the device independent color. The process of characterization performs a linearization and transforms the linearized values into the CIE XYZ tristimulus values. The purposes of this paper is to propose optimal color transformation method for accurate reproduction of original copy in display device and to explain the propriety of transformation method using specific variable for the power of gradation expression.

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Issues with the electrical characterization of graphene devices

  • Lee, Byoung-Hun;Lee, Young-Gon;Jung, Uk-Jin;Kim, Yong-Hun;Hwang, Hyeon-Jun;Kim, Jin-Ju;Kang, Chang-Goo
    • Carbon letters
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    • v.13 no.1
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    • pp.23-28
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    • 2012
  • Graphene is an attractive material for device applications, but device characteristics are very unstable because the graphene is very sensitive to environmental factors such as charges nearby the graphene, metal contacts, defects, contaminants and other adsorbates. Since the interactions between graphene and environmental factors affect the electrical characteristics of graphene devices, the interpretation of electrical characteristics as simple as current-voltage curves is non-trivial, despite the common practice of using well known electrical characterization methods that have been used in silicon MOSFET. This paper addresses major obstacles in the electrical characterization of graphene devices and offers countermeasures to improve the accuracy of electrical characterization methods.

Color matching between monitor and mobile display device using improved S-curve model and RGB color LUT (개선된 S-curve 모델과 RGB 칼라 LUT를 이용한 모니터와 모바일 디스플레이 장치간 색 정합)

  • 박기현;이명영;이철희;하영호
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.41 no.6
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    • pp.33-41
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    • 2004
  • This paper proposes a color matching 3D look-up table simplifying the complex color matching procedure between a monitor and a mobile display device. In other to perform color matching, it is necessary to process color of image in the device independent color space like CIEXYZ or CIELAB. To obtain the data of the device independent color space from that of the device dependent RGB color space, we must perform display characterizations. LCD characterization error using S-curve model is larger than tolerance error since LCD is more nonlinear than CRT. This paper improves the S-curve model to have smaller characterization error than tolerance error using the electro-optical transfer functions of X, Y, and Z value. We obtained images having higher color fidelity on mobile display devices through color matching experiments between monitor and mobile display devices. As a result of this experiments, we concluded that the color matching look-up table with 64(4${\times}$4${\times}$4) is the smallest size allowing characterization error to be acceptable.

Color matching between monitor and mobile display device using improved S-curve model and RGB color LUT (개선된 S-curve 모델과 RGB 칼라 참조표를 이용한 모니터와 모바일 디스플레이 장치간 색 정합)

  • 박기현;이명영;이철희;하영호
    • Proceedings of the IEEK Conference
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    • 2003.11a
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    • pp.15-18
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    • 2003
  • This paper proposes a color matching 3D look-up table simplifying the complex color matching procedure between a monitor and a mobile display device. In order to perform color matching, it is necessary to process color of image in the device independent color space like CIEXYZ or CIELAB. We improved the S-curve model to have smaller characterization error than tolerance error. Also, as a result of the experiments, we concluded that the color matching look-up table with 64(4$\times$4$\times$4) is the smallest size allowing characterization error to be acceptable.

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