Plural layer liquid crystal display device for a high density display
First Claim
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1. A liquid crystal display device comprising:
- a first liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material which is interposed between a pair of substrates each having an aligning layer which are arranged substantially in parallel;
a voltage applying means to apply a voltage across transparent electrodes of said pair of substrates which interpose said first liquid crystal layer therebetween;
a second liquid crystal layer of a nematic liquid crystal including a chiral material which is interposed between a pair of substrates each having an aligning layer, said second liquid crystal layer being adjacent to said first liquid crystal layer; and
a pair of polarizing plates arranged outside said first and second liquid crystal layers, wherein;
said second liquid crystal layer contains dye for color compensation;
the product Δ
n1 ·
d1 of an anisotropy of refractive index Δ
n1 of liquid crystal in said first liquid crystal layer and a thickness of the first liquid crystal layer d1 is in a range of 0.7-2.0 μ
m;
an axial direction of liquid crystal molecules of said first liquid crystal layer in an area close to said second liquid crystal layer is crossed at substantially a right angle to an axial direction of liquid crystal molecules of said second liquid crystal layer in an area close to said first liquid crystal layer;
a twist angle of the liquid crystal molecules in said first liquid crystal layer is in a range of 200°
-300°
;
a twist angle of the liquid crystal molecules in said second liquid crystal layer is substantially the same as the first liquid crystal layer but a helical sense thereof is opposite; and
an angle of intersection of the polarization axes of said pair of polarizing plates arranged outside said two liquid crystal layers is in a range of 60°
-120°
.
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Abstract
A plural layer liquid crystal display device for a high density display has a second liquid crystal layer containing dye and a dirst layer constructed such that the product Δn1 ·d1 of the anisotropy of refractive index Δn1 of liquid molecules in the first liquid crystal layer and the thickness of the first liquid crystal layer d1 is in a range of 0.7-2.0 μm. The foregoing arrangement provides a display close to a monochrome display with excellent viewing angle characteristics and a high contrast ratio.
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Citations
14 Claims
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1. A liquid crystal display device comprising:
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a first liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material which is interposed between a pair of substrates each having an aligning layer which are arranged substantially in parallel; a voltage applying means to apply a voltage across transparent electrodes of said pair of substrates which interpose said first liquid crystal layer therebetween; a second liquid crystal layer of a nematic liquid crystal including a chiral material which is interposed between a pair of substrates each having an aligning layer, said second liquid crystal layer being adjacent to said first liquid crystal layer; and a pair of polarizing plates arranged outside said first and second liquid crystal layers, wherein; said second liquid crystal layer contains dye for color compensation; the product Δ
n1 ·
d1 of an anisotropy of refractive index Δ
n1 of liquid crystal in said first liquid crystal layer and a thickness of the first liquid crystal layer d1 is in a range of 0.7-2.0 μ
m;an axial direction of liquid crystal molecules of said first liquid crystal layer in an area close to said second liquid crystal layer is crossed at substantially a right angle to an axial direction of liquid crystal molecules of said second liquid crystal layer in an area close to said first liquid crystal layer; a twist angle of the liquid crystal molecules in said first liquid crystal layer is in a range of 200°
-300°
;a twist angle of the liquid crystal molecules in said second liquid crystal layer is substantially the same as the first liquid crystal layer but a helical sense thereof is opposite; and an angle of intersection of the polarization axes of said pair of polarizing plates arranged outside said two liquid crystal layers is in a range of 60°
-120°
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A liquid crystal display device comprising:
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a first liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material which is interposed between a pair of substrates each having an aligning layer which are arranged substantially in parallel; a voltage applying means to apply a voltage across transparent electrodes of said pair of substrates which interpose said first liquid crystal layer therebetween; a second liquid crystal layer of a nematic liquid crystal including a chiral material which is interposed between a pair of substrates each having an aligning layer, said second liquid crystal layer being adjacent to said first liquid crystal layer; and a pair of polarizing plates arranged outside said first and second liquid crystal layers, wherein; said second liquid crystal layer contains dye; the product Δ
n1 ·
d1 of an anisotropy of refractive index Δ
n1 of liquid crystal in said first liquid crystal layer and a thickness of the first liquid crystal layer d1 is in a range of 0.7-2.0 μ
m;an axial direction of liquid crystal molecules of said first liquid crystal layer in an area close to said second liquid crystal layer is crossed at substantially a right angle to an axial direction of liquid crystal molecules of said second liquid crystal layer in an area close to said first liquid crystal layer; a twist angle of the liquid crystal molecules in said first liquid crystal layer is in a range of 200°
-300°
;a twist angle of the liquid crystal molecules in said second liquid crystal layer is substantially the same as the first liquid crystal layer but a helical sense thereof is opposite; and an angle of intersection of the polarization axes of said pair of polarizing plates arranged outside said two liquid crystal layers is in a range of 60°
-120°
, wherein 0.1-5 wt% of a dye which absorbs yellow color is incorporated. - View Dependent Claims (14)
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Specification