Color compensated double layered liquid crystal display device

Details Color compensated double layered liquid crystal display device Color compensated double layered liquid crystal display device

1989-12-22

1992-06-30

Hille, Rolf

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 53, 359 63, 359 73, G02F 113

Patent

active

051268680

ABSTRACT:
A display cell is mounted on a color-compensating cell. The display cell has a pair of substrates each having an alignment-treated surface, a first liquid-crystal layer and electrodes. Multiplex drive signals are supplied to the electrodes. The color-compensating cell has a second liquid-crystal layer. The molecules of the first liquid-crystal layer are twisted by a twist angle ranging from 160.degree. to 270.degree.. The molecules of the second liquid-crystal layer are twisted by the same angle in the opposite direction. The substrates are alignment-treated in two directions, respectively, which are substantially at right angles to each other. One of the polarizing plates has an optical axis crossing at 35.degree. to 50.degree. with an aligning direction of the liquid crystal molecules on that substrate adjacent to the polarizing plate, and crossing with the optical axis of the other polarizing plate at right angles. The second liquid-crystal cell compensates for the coloring of the light passing through the display cell. The second liquid-crystal layer has retardation .DELTA.n.sub.2 .multidot.d.sub.2, which is less than the retardation .DELTA.n.sub.1 .multidot.d.sub.1 of said first liquid-crystal layer, for compensating for a decrease in the retardation .DELTA.n.sub.1 .multidot.d.sub.1, which has resulted from the excitation of the liquid-crystal molecules by application of a bias voltage to unselected pixels of the display cell.

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S.I.D. International Symposium, Digest of Technical Papers, May 1988, vol. XIX, pp. 49-52, 487, SID; N. Kimura et al., "Multicolor Display by Double-Layered Supertwisted-Nematic LCD", Sections 105, 8; FIGS. 1,3.
Japanese Journal of Applied Physics/Part 2, Letters, vol. 26, No. 11, Nov. 1987, pp. L1784-L1786, Tokyo, JP; Katoh et al., "Application of Retardation Compensation; A New Highly Multi-Plexiable Black-White Liquid Crystal Display with Two Super-Twisted Nematic Layers".

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