Liquid crystal display device, compensator layer and method of manufacturing a retardation foil
AssigneeKoninklijke Philips Electronics N.V.
InventorsPeter Van De Witte, Johannes A. M. M. Van Haaren, Rifat A. M. Hikmet, Dirk J. Broer
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Abstract
The invention relates to a liquid-crystal display device comprising a display cell and a plurality of retardation foils of polymerized or vitrified liquid-crystal material, whose liquid-crystal molecules have a tilt angle with respect to a plane parallel to the substrates, which retardation foils have substantially complementary indicatrices so that each one of the retardation foils brings about the compensation of approximately half the display cell in the driven state.
Claims20
A liquid-crystal display device having a display cell comprising;
- a layer of a nematic, liquid-crystal material disposed between two substantially parallel substrates, the nematic, liquid-crystal material having a twist angle which lies in a range of 60-120 degrees;
- first and second polarizers disposed with the substrates, the first and second polarizers having first and second polarizing directions;
- and
- first and second retardation foils disposed in a predetermined relationship with the first and second polarizers, wherein the first and second retardation foils respectively comprise polymerized or vitrified liquid-crystalline material comprising liquid-crystal molecules which respectively:
- a) have average orientations which respectively extend in first and second directions which directions are respectively parallel to first and second planes that are normal to the substrates, the first and second planes being oriented with respect to one another at an angle in a range of 60 to 120 degrees;
- and
- b) exhibit first and second average tilt angles relative to the substrates.
A compensator layer comprising:
- first and second retardation foils which conprise polymerized or vitrified liquid-crystalline material comprising liquid-crystal molecules, the liquid-crystal molecules in the polymerizing or vitrified liquid-crystalline material of the first and second retardation foils respectively exhibiting first and second tilt angles which are respectively parallel to first and second planes that are normal to major surfaces of the foils and that are angled with respect to one another by an angle of 60-120 degrees.
A compensator layer as claimed in claimed 15, wherein the polymerized or vitrified material comprises liquid-crystalline molecules which are provided, at one end, with a non-polar group and, at the other end, with a polar group.
Dependencies are inferred from the claim text.