Vertically aligned liquid crystal display having positive compensation film
AssigneeLG Chem, Ltd.
InventorsByoung-kun Jeon, Sergey Belyaev, Jeong-su Yu
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AssigneeLG Chem, Ltd.
InventorsByoung-kun Jeon, Sergey Belyaev, Jeong-su Yu
Estimating the term…
The present invention relates to a vertically aligned LCD (VA-LCD) comprising a positive compensation film including one or more of a first retardation film (+A-plate) satisfying the condition of nx>ny=nz and a second retardation film (−C-plate) satisfying the condition of nx=ny>nz, wherein the first retardation film is arranged such that its optical axis is perpendicular to an optical absorption axis of a neighboring polarizing plate, and a total thickness retardation (R−C+RVA) including the thickness retardation of the second retardation film and the thickness retardation of a VA-panel has a positive value in then range of 50-150 nm. The VA-LCD in accordance with the present invention improves contrast characteristics on a front surface and at a tilt angle and minimizes coloring in a black state according to the tilt angle.
A vertically aligned LCD (VA-LCD) in a multi-domain mode or using a chiral additive, provided with a positive compensation film, in which a vertically aligned panel (VA-panel) is obtained by injecting liquid crystal having a negative dielectric anisotropy (Δ∈<0) or a positive dielectric anisotropy (Δ∈>0) into a gap between upper and lower glass substrates, upper and lower polarizing plates are arranged above the upper and lower surfaces of the VA-panel so that optical absorption axes of the polarizing plates are perpendicular to each other, and a cell gap in the range of 3 μm to 8 μm is maintained, comprising:
The VA-LCD according to 5, wherein directors of liquid crystalline polymers of the VA-panel, under the condition that small voltage is applied to the VA-panel, have a pretilt angle in the range of 75° to 90° between the upper and lower glass substrates.
Dependencies are inferred from the claim text.