Invention Publication
EP0638834A3 Display device having a pi-cell configuration and retardation compensation 失效
具有pi单元结构和延迟补偿的显示设备

  • Patent Title: Display device having a pi-cell configuration and retardation compensation
  • Patent Title (中): 具有pi单元结构和延迟补偿的显示设备
  • Application No.: EP94401854.8
    Application Date: 1994-08-12
  • Publication No.: EP0638834A3
    Publication Date: 1995-06-21
  • Inventor: Welzen, Theo
  • Applicant: SAGEM S.A.
  • Applicant Address: 6, Avenue d'Iéna F-75016 Paris FR
  • Assignee: SAGEM S.A.
  • Current Assignee: SAGEM S.A.
  • Current Assignee Address: 6, Avenue d'Iéna F-75016 Paris FR
  • Agency: Fort, Jacques
  • Priority: NL9301408 19930813
  • Main IPC: G02F1/139
  • IPC: G02F1/139 G02F1/1335
Display device having a pi-cell configuration and retardation compensation
Abstract:
In a liquid-crystal display device having a pi-cell configuration between crossed polarizers and having a liquid-crystal retardation value such that it is possible to switch from a Bright state at low voltage to a Dark state at high voltage, the voltage for setting the Dark state can be lowered by making use of retardation films whose optical axes are parallel to the cell surfaces and perpendicular to the projection direction of the liquid-crystal director on the cell surfaces. Positioning of said films on both sides of the pi-cell in such a way that the total film retardation on the one side is equal to that on the other side results in angle-of-view-dependent transmission characteristics having better symmetry than in the case of the films being positioned on one side.
Information query
Patent Agency Ranking
0/0