Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Study on the Effect of the Operation Voltage according to the Reverse Twist for the fringe Field Switching (FFS) Mode

FFS 모드에서 Reverse Twist가 구동전압에 미치는 영향에 관한 연구

  • 김미숙 (BOE_TFT_LCD_SBU 선행기술그룹) ;
  • 정연학 (BOE_TFT_LCD_SBU 선행기술그룹) ;
  • 신승민 (BOE_TFT_LCD_SBU 선행기술그룹) ;
  • 김향율 (BOE_TFT_LCD_SBU 선행기술그룹) ;
  • 김서윤 (BOE_TFT_LCD_SBU 선행기술그룹) ;
  • 임영진 (BOE_TFT_LCD_SBU 선행기술그룹) ;
  • 이승희 (전북대학교 신소재공학부)
  • Published : 2005.11.01
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Abstract

We have studied on the effect of the operation voltage according to the reverse twist for the different fringe field switching (FFS) structure. The FFS structure with a vertically patterned edge of the pixel electrode (VPP) has lower operation voltage comparing to the one with a horizontally patterned edge of the pixel electrode (HPP). The reason is like that the number of the pattern of the pixel edge for the VPP structure is one third comparing with the HPP structure and thus, there is small reverse twist area for the VPP structure. Actually, the reverse twist disturbs the twist of LC near adjacent active area, result that LCs near there have the unstable dynamics. That is, the operation voltage increases as the reverse twist area increases. Therefore, it is very important to design pixel electrode with a small reverse twist region for the FFS mode.

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References

  1. M. Schadt and W. Helfrich, 'Voltagedependent optical activity of twisted nematic liquid crystal', Appl. Phys. Lett., Vol. 18, No. 4, p. 127, 1971
  2. H. Y. Kim, I. S. Song, and S. H. Lee, 'Rubbing angle effects on the electro-optic characteristics of in- plane switching liquid crystal display', Trans. EEM, Vol. 4, No.1, p. 24, 2003
  3. 김향율, 고재완, 노정동, 서대식, 이승희, '유전율 이방성의 음인 액정을 이용한 이중 도메인 FFS 모드의 전기광학 특성', 전기전자재료학회논문지, 15권, 8호, p. 720, 2002
  4. 김미숙, 김향율, 고재완, 이승희, '프린즈 전기장애 의해 구동되는 수평 배향 액정셀에서 black matrix의 전기적 특성이 셀의 전기 광학 특성에 미치는 영향에 관한 연구', 전기전자재료학회논문지, 16권, 11호, p. 1008, 2003
  5. M. S. Kim, Y. H. Jung, S. M. Seen, H. Y. Kim, S. Y. Kim, Y. J. Lim, and S. H. Lee, 'A novel fringe field switching (FFS) mode with 3 divided pixel slit', Jpn. J. Appl. Phys., Vol. 44, No. 5A. p. 3121, 2005
  6. M. S. Kim, S. M. Seen, Y. H. Jung, H. Y. Kim, S. Y. Kim, Y. J. Lim, and S. H. Lee, 'Effect of horizontal electrid field generated by data signal on disclination lines near pixel edge in fringe field switching mode', Jpn. J. Appl. Phys., Vol. 44, No. 9A, p. 6698, 2005
  7. A. Lien, 'Extended Jones matrix representation for twisted nematic liquid crystal display at oblique incidence', Appl. Phys. Lett., Vol. 57, No. 26, p. 2767, 1990