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US 7,410,678 B2Granted
Liquid crystal display using ferroelectric liquid crystal, and fabrication method thereof
AssigneeLG Display Co., Ltd.
InventorSu Seok Choi
Life of this patent
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Abstract
A liquid crystal display utilizes ferroelectric liquid crystals in its construction. The liquid crystal display includes a first substrate, a first alignment layer over the first substrate, and a first ferroelectric liquid crystal layer over the first alignment layer, which has a polarity in a first direction. A second substrate faces the first substrate, a second alignment layer is over the second substrate, and a second ferroelectric liquid crystal layer is over the second alignment layer. Both ferroelectric layers have and a polarity in the same direction.
Claims16
A liquid crystal display comprising:
- a first substrate;
- a first alignment layer over the first substrate;
- a first ferroelectric liquid crystal layer over the first alignment layer, and having a polarity in a first direction;
- a second substrate facing the first substrate;
- a second alignment layer over the second substrate;
- a second ferroelectric liquid crystal layer over the second alignment layer, and having a polarity of the same first direction as the first ferroelectric liquid crystal layer;
- and
- a third liquid crystal layer formed between the first ferroelectric liquid crystal layer and the second ferroelectric liquid crystal layer,
- wherein the third liquid crystal layer has a phase transition from a nematic phase to an isotropic phase when the temperature is raised.
6 more elements
A method for fabricating a liquid crystal display, the method comprising:
- forming first and second alignment layers over first and second substrates, respectively;
- forming first and second ferroelectric liquid crystal layers over the first and second alignment layers, respectively;
- filling a third liquid crystal layer between the first and second substrates to form a liquid crystal panel;
- heating the liquid crystal panel to a temperature T1 to cause a phase transition of the first and second ferroelectric liquid crystal layers to nematic liquid crystal layers having a chiral nematic (N*) phase and to also cause a phase transition of the third liquid crystal layer to an isotropic liquid crystal layer;
- cooling the liquid crystal panel to a temperature of T2 and applying a direct current voltage to the liquid crystal panel, to cause a phase transition of the first and second ferroelectric liquid crystal layers from the chiral nematic (N*) phase to a chiral smectic C (SmC*) phase and maintain the third liquid crystal layer in an isotropic phase;
- and
- cooling the liquid crystal panel to a temperature T3, to maintain the first and second ferroelectric liquid crystal layers in the chiral smectic C (SmC*) phase and to cause a phase transition of the third liquid crystal layer from the isotropic phase to the chiral nematic (N*) phase.
4 more elements
A method for fabricating a liquid crystal display, the method comprising:
- forming first and second alignment layers over first and second substrates, respectively;
- forming first and second ferroelectric liquid crystal layers over the first and second alignment layers, respectively;
- filling a third liquid crystal layer between the first and second substrates to form a liquid crystal panel;
- heating the liquid crystal panel at a predetermined temperature of T1 to cause a phase transition of the first and second ferroelectric liquid crystal layers to smectic A (SmA) phase liquid crystal layers and cause a phase transition of the third liquid crystal layer to an isotropic liquid crystal layer;
- cooling the liquid crystal panel to a temperature T2 and applying a direct current voltage to the liquid crystal panel, to cause a phase transition of the first and second ferroelectric liquid crystal layers from the smectic A (SmA) phase to a chiral smectic C (SmC*) phase and maintaining the third liquid crystal layer in an isotropic phase;
- and
- cooling the liquid crystal panel to a temperature of T3, to maintain the first and second ferroelectric liquid crystal layers in the chiral smectic C (SmC*) phase and cause a phase transition of the third liquid crystal layer from the isotropic phase to a chiral nematic (N*) phase.
4 more elements
Dependencies are inferred from the claim text.