Liquid crystal display device

Details Liquid crystal display device Liquid crystal display device

1992-04-30

1993-08-17

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 63, G02F 1133

Patent

active

052374386

ABSTRACT:
In an STN type liquid crystal display device, two retardation plates are located one on each side of an STN liquid crystal cell. A twist angle .phi..sub.0 of the liquid crystal cell is set to fall within the range of 200.degree. to
.DELTA.n.multidot.d value of the liquid crystal is set to 240.degree., and the .DELTA.n.multidot.d value of the liquid crystal is set to fall within the range of 700 nm to 900 nm (measurement wavelength: 589 nm). With respect to the direction of aligning treatment of an incident-side substrate, the light-transmitting axis of a polarizer is inclined at an angle falling within the range of 140.degree. to 180.degree., the light-transmitting axis of an analyzer is inclined at an angle falling within the range of (270.degree.-.vertline..phi..sub.0 .vertline./2).+-.10.degree., the phase delay axis of the first retardation plate is inclined at an angle falling within the range of (180.degree.-.vertline..phi..sub.0 .vertline./2) to (180.degree.-.vertline..phi..sub.0 .vertline./2)+30.degree., and the phase delay axis of the second retardation plate is inclined at an angle falling within the range of (180.degree.-.vertline..phi..sub.0 .vertline./2) to (180.degree.-.vertline..phi..sub.0 .vertline./2)-30.degree.. The .DELTA.n.multidot.d value of each of the first and second retardation plates is preferably set to be 1/2 (i.e., 2 in 1/2 represents the number of retardation plates) a value obtained by multiplying the .DELTA.n.multidot.d value of the liquid crystal with 0.80 to 0.95.

REFERENCES:
patent: 5124824 (1992-06-01), Kozaki et al.
patent: 5126866 (1992-06-01), Yoshimizu et al.
patent: 5166817 (1992-11-01), Ota et al.

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