LCD having particular dielectric constant relationship between orientation film and LC layer
First Claim
Patent Images
1. A liquid crystal display device comprising pixels and electrodes for driving the pixels, each pixel comprising a display element defined by picture electrodes, which display element comprises layers of orienting material and a layer of liquid crystal material between the picture electrodes, characterized in that, for the quotient Q of a dielectric constant ∈
-
LC of the liquid crystal material and the dielectric constant of the layers of orienting material ∈
ol it holds that Q=∈
LC/∈
ol>
0.7ρ
ol/ρ
LC, in which, for a liquid crystal material having a negative dielectric anisotropy (Δ
∈
<
0)∈
LC, the dielectric constant perpendicular to the directors of the liquid crystal material is (∈
⊥
), and for a liquid crystal material having a positive dielectric anisotropy (Δ
∈
>
0)∈
LC, the dielectric constant parallel to the directors of the liquid crystal material is (∈
∥
) and ρ
ol and ρ
LC are the resistivities of the liquid crystal material and the layers of orienting material, respectively, and wherein the display device is DC driven.
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Abstract
In a liquid crystal display device, the dielectric constants (∈) and resistivities (ρ) of the liquid crystal material and the layers of orienting material have such values that the liquid crystal display device can be driven by means of a DC voltage.
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Citations
11 Claims
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1. A liquid crystal display device comprising pixels and electrodes for driving the pixels, each pixel comprising a display element defined by picture electrodes, which display element comprises layers of orienting material and a layer of liquid crystal material between the picture electrodes, characterized in that, for the quotient Q of a dielectric constant ∈
-
LC of the liquid crystal material and the dielectric constant of the layers of orienting material ∈
ol it holds that Q=∈
LC/∈
ol>
0.7ρ
ol/ρ
LC, in which, for a liquid crystal material having a negative dielectric anisotropy (Δ
∈
<
0)∈
LC, the dielectric constant perpendicular to the directors of the liquid crystal material is (∈
⊥
), and for a liquid crystal material having a positive dielectric anisotropy (Δ
∈
>
0)∈
LC, the dielectric constant parallel to the directors of the liquid crystal material is (∈
∥
) and ρ
ol and ρ
LC are the resistivities of the liquid crystal material and the layers of orienting material, respectively, and wherein the display device is DC driven. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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LC of the liquid crystal material and the dielectric constant of the layers of orienting material ∈
Specification