Liquid crystal display screen

Details Liquid crystal display screen Liquid crystal display screen

1996-07-25

1998-09-22

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

349 95, 349117, 349 57, G02F 11335

Patent

active

058122257

ABSTRACT:
A display screen for improving the angle of view from which displayed images can be perceived accurately. An illumination device produces light which is collimated along a plane YOZ orthogonal to the plane XOZ in which the screen has its best characteristics in terms of contrast and/or levels of gray. The collimated illumination device is on the front face of a cell. A device for distributing the light (by diffraction or scattering) in the plane YOZ is placed at the output of the cell. One or more compensation films can be placed at the output of the cell to increase the angle of view in the plane XOZ. This device may be used in avionics and the display of video images.

REFERENCES:
patent: 4171874 (1979-10-01), Bigelow et al.
patent: 5150234 (1992-09-01), Takahashi et al.
patent: 5375006 (1994-12-01), Haas
patent: 5459592 (1995-10-01), Shibatani et al.
patent: 5467206 (1995-11-01), Loiseaux et al.
patent: 5557432 (1996-09-01), Yokota
patent: 5600456 (1997-02-01), Maruyama et al.
"Flat Collimator: A Backlighting Assembly Utilizing Microprisms For High Energy Efficiency," C-Y. Tai et al. SID International Symposium Digest of Applications Papers; vol. 25, Jun. 14, 1994. pp. 10-13.
"Normally White Negative Birefringence Film Compensated Twisted Nematic Liquid Crystal Displays With Improved Optical Performance," IBM Technical Disclosure Bulletin; vol. 36, No. 09B, Sep. 1993. p. 361.
"Multicolor Parallel-Oriented Nematic Liquid Crystal Displays Using Optical Compensation Films," IBM Technical Disclosure Bulletin; vol. 33, No. 12, May 1991. pp. 201-202.

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