Liquid crystal display device with particular angle between optical axis of optically anisotropic material and observation direction
DCFirst Claim
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1. A liquid crystal display device, comprising:
- a twisted nematic liquid crystal display cell including a pair of spaced apart opposed substrates with electrodes selectively disposed thereon and a twisted nematic liquid crystal material disposed in the space between the substrates;
a pair of polarizing plates disposed on opposite sides of the liquid crystal cell, one of which defines a display screen; and
at least one layer of an optically anisotropic substance disposed between the liquid crystal cell and one of the pair of polarizing plates;
the display screen having a rear edge as viewed from a user and an observation direction which is both in the plane of the display screen and substantially perpendicular to the rear edge thereof, the observation direction being the direction of the projection in the plane of the display screen of the direction from which a user of said display device most frequently views said display screen, the device being constructed and arranged to have a viewing angle with respect to the observation direction at which the display will have acceptable contrast to accurately convey information to a user, the angle between the direction of the optical axis of the optically anisotropic substance layer and the observation direction of the display device being set at a predetermined angle to produce substantially bilateral symmetry of the contrast distribution with respect to the observation direction as the user moves in the direction of the viewing angle β
between a projection of the direction of viewing by the user in the plane of the display screen and the observation direction or in the direction of the viewing angle α
between the direction of viewing of the user and an axis perpendicular to the observation direction and the plane of the display screen.
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Abstract
A super twisted nematic liquid crystal display device includes a liquid crystal cell, upper and lower polarizing plates, and at least one phase difference plate between the polarizing plates. The angle between the direction of the optical axis of the phase difference plate and the observation direction of the device is set between about 0°-30° or 60°-90°.
141 Citations
15 Claims
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1. A liquid crystal display device, comprising:
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a twisted nematic liquid crystal display cell including a pair of spaced apart opposed substrates with electrodes selectively disposed thereon and a twisted nematic liquid crystal material disposed in the space between the substrates; a pair of polarizing plates disposed on opposite sides of the liquid crystal cell, one of which defines a display screen; and at least one layer of an optically anisotropic substance disposed between the liquid crystal cell and one of the pair of polarizing plates; the display screen having a rear edge as viewed from a user and an observation direction which is both in the plane of the display screen and substantially perpendicular to the rear edge thereof, the observation direction being the direction of the projection in the plane of the display screen of the direction from which a user of said display device most frequently views said display screen, the device being constructed and arranged to have a viewing angle with respect to the observation direction at which the display will have acceptable contrast to accurately convey information to a user, the angle between the direction of the optical axis of the optically anisotropic substance layer and the observation direction of the display device being set at a predetermined angle to produce substantially bilateral symmetry of the contrast distribution with respect to the observation direction as the user moves in the direction of the viewing angle β
between a projection of the direction of viewing by the user in the plane of the display screen and the observation direction or in the direction of the viewing angle α
between the direction of viewing of the user and an axis perpendicular to the observation direction and the plane of the display screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A liquid crystal display device having a display screen with a rear edge as viewed from a user, comprising:
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a super twisted nematic liquid crystal cell including first and second opposed electrode substrates with a twisted nematic liquid crystal material therebetween with an angle of twist between about 180° and
260°
from the first substrate to the second, the cell having an observation direction, the observation direction being a direction of the projection in the plane of the display screen of the direction from which a user of said display device most frequently views said display screen, the observation direction being both in the plane of the display screen and substantially perpendicular to the rear edge thereof;a pair of polarizing plates disposed on opposite sides of the liquid crystal cell with Θ
1 being the angle between the observation direction and the axis of polarization of the first polarizer adjacent the first substrate of the liquid crystal cell and Θ
2 being the angle between the observation direction and the axis of polarization of the other polarizer; andat least one layer of an optically anisotropic material between the liquid crystal cell and one polarizer with Θ
3 being the angle between the optical axis of the at least one layer of optically anisotropic material and the observation direction,Θ
3 between one of about 0° and
30° and
about 60° and
90°
. - View Dependent Claims (13, 14, 15)
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Specification