STN LCD device displaying multiple colors in response to different voltages which includes a retardation plate
First Claim
1. A color liquid crystal display apparatus comprising:
- a pair of substrates having opposing surfaces, electrodes respectively formed on the opposing surfaces, and aligning films respectively formed to cover said electrodes, said aligning films having undergone aligning treatment in predetermined directions;
a liquid crystal layer formed between said pair of substrates and having liquid crystal molecules aligned to be twisted at a twist angle of 180°
to 270°
from one substrate to the other substrate;
a pair of polarizing plates disposed outside said pair of substrates to sandwich said substrates and respectively having transmission axes for linearly polarizing incident light;
a retardation plate having a maximum refraction index direction which is within a plane parallel to a surface of said retardation plate and having a value of retardation for coloring light transmitted through the liquid crystal display apparatus, in combination with the Δ
n·
d of the liquid crystal layer, said retardation plate being disposed between said pair of polarizing plates such that an angle defined by said maximum refractive index direction, and the transmission axis of an adjacent one of said polarizing plates is 35°
to 55°
; and
driving means, connected to said electrodes, for applying a voltage to said liquid crystal layer to change a polarized state of light transmitted through said liquid crystal layer so as to change a color of light transmitted through said polarizing plate on an exit side into plural colors including at least two chromatic colors.
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Accused Products
Abstract
A pair of polarizing plates are disposed on two sides of an STN type liquid crystal cell constituted by a liquid crystal twist-aligned at a twist angle of 180° to 270°. A retardation plate is disposed between one of the polarizing plates and the liquid crystal cell in such a manner that the optical axis of the retardation plate crosses the transmission axis of the adjacent polarizing plate at 35° to 55°. The pair of polarizing plates are arranged such that their transmission axes are parallel to each other. The liquid crystal cell is arranged such that the optical axis of the retardation plate crosses the aligning direction of the liquid crystal molecules on the substrate side adjacent to the retardation plate at a predetermined angle. A driving circuit is connected to the liquid crystal cell. This circuit serves to apply a voltage to the liquid crystal in accordance with display data having color information to change the polarized state of elliptically polarized light transmitted through the liquid crystal to change the color of emerging light.
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Citations
25 Claims
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1. A color liquid crystal display apparatus comprising:
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a pair of substrates having opposing surfaces, electrodes respectively formed on the opposing surfaces, and aligning films respectively formed to cover said electrodes, said aligning films having undergone aligning treatment in predetermined directions; a liquid crystal layer formed between said pair of substrates and having liquid crystal molecules aligned to be twisted at a twist angle of 180°
to 270°
from one substrate to the other substrate;a pair of polarizing plates disposed outside said pair of substrates to sandwich said substrates and respectively having transmission axes for linearly polarizing incident light; a retardation plate having a maximum refraction index direction which is within a plane parallel to a surface of said retardation plate and having a value of retardation for coloring light transmitted through the liquid crystal display apparatus, in combination with the Δ
n·
d of the liquid crystal layer, said retardation plate being disposed between said pair of polarizing plates such that an angle defined by said maximum refractive index direction, and the transmission axis of an adjacent one of said polarizing plates is 35°
to 55°
; anddriving means, connected to said electrodes, for applying a voltage to said liquid crystal layer to change a polarized state of light transmitted through said liquid crystal layer so as to change a color of light transmitted through said polarizing plate on an exit side into plural colors including at least two chromatic colors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A color liquid crystal display apparatus comprising:
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a pair of substrates having opposing surfaces, electrodes respectively formed on the opposing surfaces, and aligning films respectively formed to cover said electrodes, said aligning films having undergone aligning treatment in predetermined directions; a liquid crystal layer formed between said pair of substrates and having liquid crystal molecules aligned to be twisted at a twist angle of 180°
to 270°
from one substrate to the other substrate;a polarizing plate disposed outside one of said pair of substrates and having a transmission axis for linearly polarizing incident light; a reflection plate disposed on an opposite side to said polarizing plate with respect to said pair of substrates; a retardation plate having a maximum refractive index direction which is within a plane parallel to a surface of said retardation plate and having a value of retardation for coloring light transmitted through the liquid crystal display apparatus, in combination with the Δ
n·
d of the liquid crystal layer, said retardation plate being disposed between said polarizing plate and said reflection plate such that an angle defined by said maximum refractive index direction, and the transmission axis of said polarizing plate is 35°
to 55°
; anddriving means, connected to said electrodes, for applying a voltage to said liquid crystal layer to change a polarized state of light transmitted through said polarizing plate on an exit side into plural colors including at least two chromatic colors. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A color liquid crystal display apparatus for changing a display color in accordance with an applied voltage, comprising:
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a pair of substrates having opposing surfaces, electrodes respectively formed on the opposing surfaces, and aligning films respectively formed to cover said electrodes, said aligning films having undergone aligning treatment in predetermined directions; a liquid crystal layer formed between said pair of substrates and having liquid crystal molecules aligned to be twisted at a twist angle of 180°
to 270°
from one substrate to the other substrate;a pair of polarizing plates disposed outside said pair of substrates to sandwich said substrates and respectively having transmission axes for linearly polarizing incident light; a retardation plate having a maximum refractive index direction which is within a plane parallel to a surface of said retardation plate and having a value of retardation for coloring light transmitted through the liquid crystal display apparatus, in combination with the Δ
n·
d of the liquid crystal layer, said retardation plate being disposed to be adjacent to one of said pair of polarizing plates which is located on an incident side, for elliptically polarizing linearly polarized light transmitted through said one of said pair of polarizing plates; anddriving means, connected to said electrodes, for applying at least three different voltages to said liquid crystal layer to change a polarized state of light transmitted through said liquid crystal layer so as to change a display color to at least three colors including at least two chromatic colors.
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Specification