• Title, Summary, Keyword: advanced angle

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Viewing angle switching of Fringe-Field Switching (FFS) Liquid Crystal Display by Optimizing Pixel Structure

  • Jeong, Eun;Chin, Mi-Hyung;Kim, Youn-Sik;Lim, Young-Jin;Lee, Myong-Hoon;Lee, Seung-Hee
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.545-548
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    • 2007
  • This Viewing angle control of fringe-field switching (FFS)-LCD using only one panel has been investigated. Viewing angle switching cell is composed of main- and sub-pixel, in which the former has a role of image expression and the latter has a role of viewing angle switching.

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The viewing angle switching of TN-LCD using two tilted LC layer

  • Lim, Y.J.;Choi, M.O.;Jung, E.;Lee, M.H.;Lee, S.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.699-702
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    • 2006
  • We have developed twist nematic liquid crystal displays (TN-LCDs), of which the viewing angle can be controlled. The TN-LCDs have the function of switching between the wide viewing mode and narrow viewing angle mode using two tilted LC layers. Tilt angles of the two LC layers, $14^{\circ}$ and $60^{\circ}$ were required in both wide viewing angle and narrow viewing angle modes, respectively. In this way, the viewing angle range in terms of contrast ratio 5:1 can be switched from $120^{\circ}$ to $60^{\circ}$.

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EO Characteristic in the Advanced Vertical Alignment (VA)- π Cell a Homeotropic Blended Polymer (수직 복합폴리머 표면을 이용한 Advanced VA-π cell의 전기 광학 특성)

  • 황정연;이경준;조용민;서대식
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.9
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    • pp.826-832
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    • 2003
  • Blending effects for generating a pretilt angle in nematic liquid crystal (NLC) with negative dielectric anisotropy on the blended polyimide (PI) of homeotropic and homogeneous alignment surface were studied. Also, we investigated the EO performances for the advanced VA- $\pi$ cell using this homeotropic blended PI surface. A many decrease of tilt angle on the polymer surface to blend homeotropic PI and homogeneous PI with side chain type was measured, and the tilt angle decreased as blended ratio and rubbing strength increase. However, a small decrease of tilt angle on the polymer surface to blend homeotropic PI and homogeneous PI with main chain type was measured. The blended effects for generating a pretilt angle were clearly observed, and the many decrease of tilt angle can be achieved by using the blended PI surface. The electro-optical (EO) characteristics using the advanced VA- $\pi$ cell using the homeotropic blended PI surface than that of conventional VA cell can be improved. We suggest that the developed advanced VA-$\pi$ cell on a homeotropic blended PI surface is a promising technique for the achievement of a fast response time, and a high contrast ratio.

EO Characteristics in the Advanced Vertical Alignment VA-$\pi$ Cell on a Homeotropic Blended Polymer (수직 복합 폴리머 표면을 이용한 Advanced VA-$\pi$ cell의 전기광학 특성)

  • Lee, Kyung-Jun;Hwang, Jeoung-Yeon;Hahn, Eun-Joo;Paek, Seung-Kwon;Seo, Dae-Shik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.530-533
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    • 2002
  • Blending effects for generating a pretilt angle in nematic liquid crystal (NLC) with negative dielectric anisotropy on the blended polyimide (PI) of homeotropic and homogeneous alignment surface were studied. Also, we investigated the EO performances for the advanced VA-$\pi$ cell using this homeotropic blended PI surface. A many decrease of tilt angle on the polymer surface to blend homeotropic PI and homogeneous PI with side chain type was measured, and the tilt angle decreased as blended ratio and rubbing strength increase. The blended effects for generating a pretilt angle were clearly observed, and the many decrease of tilt angle can be achieved by using the blended PI surface. The electro-optical (EO) characteristics using the advanced VA-$\pi$ cell using the homeotropic blended PI surface than that of conventional VA cell can be improved. We suggest that the developed advanced VA-$\pi$ cell on a homeotropic blended PI surface is a promising technique for the achievement of a fast response time, and a high contrast ratio.

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Feasibility study on the contact angle measurement by laser beam projection

  • Ahn, Seon-Hoon;Kim, Seong-Hun;Shin, Kyung-In;IM, Seung-Soon
    • Proceedings of the Korean Fiber Society Conference
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    • pp.103-103
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    • 2003
  • A newly developed contact angle measurement instrument by laser beam projection allows for rapid and direct determination of contact angles. From the result of comparative experiment and questionnaire, the laser contact angle.

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Development of Narrow Viewing Angle Mode TFT LCD and Application of Advanced Gray Compensation(GC) Algorithm

  • Kim, S.H.;Lee, K.J.;Jung, Y.C.;Lee, D.G.;Baek, J.S.;Ahn, B.C.;Choi, H.C.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1383-1385
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    • 2008
  • In the viewing-angle image control (VIC) technology, one pixel is made up of a quad pixel structure which is consisting of R, G, B, and electrically control briefringence (ECB) sub-pixels. Two types of test stimuli were used; text & complex image respectively. The limitations of those methods were found from the experiment. From the results the advanced GC technology was proposed.

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EO Characteristics in the Vertical Alignment (VA)-$\pi$ mode LCD Using the Tilt Angle Decrease Effect on the Blended Polymer (혼합된 polymer에서의 틸트 감소 효과를 이용한 VA-$\pi$ mode LCD의 전기광학 특성)

  • Lee, Kyung-Jun;Hwang, Jeoung-Yeon;Seo, Dae-Shik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.53-56
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    • 2003
  • Blending effects for generating a pretilt angle in nematic liquid crystal (NLC) with negative dielectric anisotropy on the blended polyimide (PI) of homeotropic and homogeneous alignment surface were studied. Also, we investigated the EO performances for the advanced VA-$\pi$ cell using this homeotropic blended PI surface. A many decrease of tilt angle on the polymer surface to blend homeotropic PI and homogeneous PI with side chain type was measured, and the tilt angle decreased as blended ratio and rubbing strength increase. The blended effects for generating a pretilt angle were clearly observed, and the many decrease of tilt angle can be achieved by using the blended PI surface. The electro-optical (EO) characteristics using the advanced VA-$\pi$ cell using the homeotropic blended PI surface than that of conventional VA cell can be improved. We suggest that the developed advanced VA-$\pi$ cell on a homeotropic blended PI surface is a promising technique for the achievement of a fast response time, and a high contrast ratio.

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Effect of Inclination Angle and Size of Heated Surface on Pool Boiling CHF

  • Yang, Soo-Hyung;Baek, Won-Pil;Chang, Soon-Heung
    • Proceedings of the Korean Nuclear Society Conference
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    • pp.155-155
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    • 1999
  • Pool boiling critical heat flux (CHF) have been investigated using plate type test sections with different widths (3 cm & 4 cm) and lengths (10 cm, IS cm & 20 cm) under various incli- nation angles. As the inclination angle increases from $0^{\circ}$ (horizontally facing downward plate) to $30^{\circ}$, CHF sharply increases. After that angle, CHF gradually increases with the increase of the inclination angle. There must be a transition angle between $0^{\circ}$ and $30^{\circ}$, at which the CHF increase rate remarkably changes. According to the comparison of present and previous ex- periments, the transition angle may be affected by heater size and increase with the increase of heater size. The size effect of heated surface on CHF is noticeable in the L15 & L20 series and W4 series; however, it seems to be difficult to find the size effect in L10 series and W3 series.

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Study on Color Characteristics of a Dark State in the In-Plane Switching (IPS)Liquid Crystal Cell

  • Jung, B.S.;Baik, I.S.;Song, I.S.;Lee, S.H.;Kim, D.S.;Kim, K.J.;Ahn, B.C.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.453-456
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    • 2005
  • Color characteristics of a dark state in the IPS-mode depending on viewing direction have been studied. IPS-mode is having a little variation of $d{\Delta}n$ with viewing angle since the LC rotates in plane. However, this mode shows asymmetric light leakage and color characteristics with viewing angle in a dark state. This drawback can be overcome by optimized retardation value of TAC film, pre-tilt angle & $d{\Delta}n$ of LC.

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Study on In-Plane Switching mode with discotic compensation film (Discotic 필름 보상형 In-Plane Switching 모드에 관한 연구)

  • Song, I.S.;Baik, I.S.;Jung, B.S.;Jeon, Y.M.;Lee, S.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.518-521
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    • 2004
  • We have investigated about compensation film to reduce the light leakage at an oblique angle in-plane switching mode. It is well known that uncompensated in-plane switching (US) and fringe field switching (FFS) liquid crystal displays (LCDs) have much better viewing angle than other modes owing to the in-plane rotation of the LC director. However, to accomplish optimal viewing angle characteristics in these devices, they must be compensated by one or more films. So, in this paper, we have studied how to reduce the light leakage with viewing angle using discotic film in dark state.

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