Title:
LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
Japanese Patent JPH04115224
Kind Code:
A
Abstract:
PURPOSE:To make a black display and to obtain improved visual dependency by laminating a optically positive liquid crystal layer which is oriented in parallel and an optical negative optical compensating layer which has an optical axis in an in-surface direction parallel to the parallel orientation direction on a substrate. CONSTITUTION:The optical axes of a homogeneous cell 101 wherein optically positive liquid crystal molecules are oriented in parallel and the optically negative optical compensating layer 102 are set parallel. When incident linear polarized light 103 which is polarized at 45 deg. to the optical axis is made incident, (x)-axial linear polarized light 104 (shown in figure) is delayed behind (y)-axial linear polarized light 105 in the homogeneous cell 101. The optical compensating layer 102, however, is optically negative, so the (x)-axial linear polarized light leads the (y)-axial linear polarized light. The phase speed in the optical axis direction is faster than the phase speed in a direction crossing it at right angles in an optically negative medium, so birefringence quantities of the both become zero and light wavelength dispersion is eliminated, so that the black display can be made.
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Inventors:
SUMIYOSHI KEN
Application Number:
JP23481490A
Publication Date:
April 16, 1992
Filing Date:
September 05, 1990
Export Citation:
Assignee:
NEC CORP
International Classes:
G02F1/1347; G02F1/1335; G02F1/137; G02F1/139; G09F9/30; G09F9/35; (IPC1-7): G02F1/1335; G02F1/1347; G02F1/137; G09F9/30; G09F9/35
Domestic Patent References:
| JPH0267518A | 1990-03-07 | |||
| JPH0247629A | 1990-02-16 | |||
| JPH02253233A | 1990-10-12 |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)