Liquid crystal display panel
AssigneeFujitsu Limited
InventorsShoichi Kato, Kaoru Arai, Ikuo Tomita
Life of this patent
Estimating the term…
Abstract
A double-layered super-twisted nematic liquid crystal display panel, comprising a drive cell having a first liquid crystal layer and control electrodes, and a compensator cell having a second liquid crystal layer. In the first aspect, the first and second liquid crystal layers have the same twist angle in reverse directions and the first liquid crystal layer has a product .DELTA.n.d of a birefringence .DELTA.n and a panel thickness d 1.02-1.20 times larger than that of the second liquid crystal layer. In the second aspect, the second liquid crystal layer has a twist angle larger than that of the second liquid crystal layer by 150.degree.-210.degree., preferably about 180.degree..
Claims11
A double-layered super-twisted nematic liquid crystal display panel, comprising:
- (A) a first liquid crystal cell including:
- (i) a first super-twisted nematic liquid crystal layer having a first layer thickness d.sub.1 and a first twist angle of not less than 180.degree. in a first direction and containing first liquid crystal molecules having a first birefringence .DELTA.n.sub.1, and
- (ii) transparent matrix-type electrodes sandwiching said first super-twisted nematic liquid crystal layer and selectively modulating a state of twist of said first liquid crystal molecules of said first super-twisted nematic liquid crystal layer by selectively applying a voltage thereto;
- (B) a second liquid crystal cell stacked with said first liquid crystal cell, said second liquid crystal cell including a second super-twisted nematic liquid crystal layer having a second layer thickness d.sub.2 and a second twist angle of not less than 180.degree. in a second direction and containing second liquid crystal molecules having a second birefringence .DELTA.n.sub.2, said second twist angle being almost the same as said first twist angle, said second twist direction being reverse to said first twist direction;
- and
- (C) polarizing means for visibly enhancing modulated and non-modulated states of said first liquid crystal molecules in said first liquid crystal cell;
- wherein a product .DELTA.n.sub.1 d.sub.1 of said first birefringence .DELTA.n.sub.1 and said first layer thickness d.sub.1 of said first liquid crystal layer is in a range of 0.51-1.68 .mu.m and is 1.02-1.20 times larger than a product .DELTA.n.sub.2 d.sub.2 of said second birefringence .DELTA.n.sub.2 and said second layer thickness d.sub.2 of the second liquid crystal layer.
A double-layered super-twisted nematic liquid crystal display panel, comprising:
- (A) a first liquid crystal cell including:
- (i) a first super-twisted nematic liquid crystal layer containing first liquid crystal molecules and having a first twist angle T.sub.1 of not less than 180.degree. in a first direction, and
- (ii) transparent matrix-type electrodes sandwiching said first liquid crystal layer and selectively modulating a state of twist of the liquid crystal molecules of said first super-twisted nematic liquid crystal layer by selectively applying a voltage thereto;
- (B) a second liquid crystal cell stacked with said first liquid crystal cell, said second liquid crystal cell including a second liquid crystal layer containing second liquid crystal molecules and having a second twist angle T.sub.2 of not less than 180.degree. in a second direction, said second twist direction being reverse to said first twist direction;
- and
- (C) polarizing means for visibly enhancing modulated and non-modulated states of said first liquid crystal molecules in said first liquid crystal cell;
- wherein said second twist angle T.sub.2 is in a range from T.sub.1 +150.degree. to T.sub.1 +210.degree..
Dependencies are inferred from the claim text.