STN displays having high contrast, with purple polarizer and res

Details STN displays having high contrast, with purple polarizer and res STN displays having high contrast, with purple polarizer and res

1993-11-22

1996-08-27

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 70, 359 64, G02F 11335

Patent

active

055506607

ABSTRACT:
A display system (10) or display (12) has a supertwisted nematic liquid crystal cell (30) located between first and second polarizing filters (24, 54) that have respective first (26) and second (56) transmission axes that form respective polar angles (A, D) with a reference plane (28). The first polarizing filter passes a neutral polarized color along the first transmission axis and has another transmission axis (27) orthogonal to the first transmission axis and transmissive of a purple polarized color; the second polarizing filter is of a neutral density type. The cell has first and second electrode structures (32, 34) confining a liquid crystal composition, each having an inner surface with respective liquid crystal alignment directions (38, 40) of inner-surface-contacting directors of the liquid crystal composition forming respective polar angles (B, C) with the reference plane. The second polarizing filter may be associated with a translucent film (64) to reflect light toward the second polarizing filter. Preferred polar angles include: A=110.degree.; B=150.degree.; C=30.degree.; and D=-10.degree.. With those angles, the display has excellent contrast, viewability, and color hue contrast between display elements (52) in the nonselected state (which appear greenish-gold) and display elements in the selected state (which appear dark purplish-blue); display elements in the relaxed state appear gold at room temperature.

REFERENCES:
patent: 4859037 (1989-08-01), Iwashita et al.
patent: 5089906 (1992-02-01), Ohnishi et al.
patent: 5119216 (1992-06-01), Wada et al.
patent: 5126868 (1992-06-01), Kizaki et al.
patent: 5139340 (1992-08-01), Okumura
patent: 5361163 (1994-11-01), Matsuda et al.

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