Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1996-09-25
1998-04-28
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349 57, G02F 11335
Patent
active
057451990
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid crystal display device, and specifically to a transmission type liquid crystal display device substantially independent of view angle and having a wide visiblity angle and high image quality.
BACKGROUND ART OF THE INVENTION
In liquid crystal display devices, a displayed image is observed by utilizing an electro-optical effect of liquid crystal molecules, that is, by using a body arranged with liquid crystal optical shutters which change ray transmittance or reflectance by utilizing optical anisotropy (anisotropy in refractive index), orientation, flowability and dielectric anisotropy of liquid crystal molecules, and changing the orientation condition of the liquid crystals by applying an electric field or sending an electric current to appropriate display elements. Such liquid crystal display devices are broadly used for personal computers, word processors, television receivers, portable electronic instruments, game machines, information display devices mounted on cars, and other information display devices.
As a display principle in liquid crystal display devices, a twisted nematic liquid crystal, in which a voltage applied to a nematic liquid crystal layer twisted at an angle of about 90 degrees is controlled and the change of polarization of the resulting liquid crystal layer is displayed combining with a polarizer, is broadly used because of its high display performance.
However, in liquid crystal display devices, there is a property dependent on view angle that the image quality varies depending upon the observation direction (a property wherein a display quality or a displayed image varies depending on the direction of an observer relative to the display scope. When the view angle is beyond a certain range, the displayed image cannot be recognized. Hereinafter, the range of angle acceptable to an observer is also referred to merely as "visible angle".). Particularly, in case of a twisted nematic liquid crystal, there is a problem that color tone varies, and that the visible angle is narrow.
With this problem, technology for forming one pixel with a plurality of liquid crystal orientation regions such as orientation dividing method is proposed.
Further, proposed is a technology for disposing an optical compensator having an anisotropy in birefringence at a position between a polarizer and a liquid crystal cell.
Furthermore, it is described in JP-A-HEI-5-249459 that the dependency of display quality on observation direction can be decreased and a liquid crystal display device having a wider visible angle can be obtained as compared with a broadly used conventional liquid crystal display device, i.e., a usual liquid crystal display device which does not use a microlens array sheet, by a transmission type liquid crystal display device which has a liquid crystal cell including display elements arranged lengthwise and crosswise, a microlens array sheet attached to the observation surface of the liquid crystal cell and including minute unit lenses arranged in plane and a backlight source.
Still further, it is described in JP-A-HEI-6-27454 that a liquid crystal display device capable of enlarging the visible angle while preventing deterioration of the image quality can be obtained by forming a microlens array sheet by providing a first substance layer and a second substance layer having a refractive index less than the refractive index of the first substance layer between two planes extending parallel to each other and arranging minute unit lenses in plane which function as lenses by providing concavities and/or convexities to an interface defined between the first and second substance layers, and by attaching the microlens array sheet such that the second substance layer side of the microlens array sheet is directed to the liquid crystal cell side and the first substance layer side thereof is directed to the observation side.
Furthermore, a technology is known as disclosed in JP-A-HEI-6-95099 that a liquid crystal display device
REFERENCES:
patent: 5384882 (1995-01-01), Shimamune et al.
patent: 5555476 (1996-09-01), Suzuki et al.
Mikami Yuko
Suzuki Motoyuki
Uchida Tetsuo
Miller Austin R.
Nguyen Tiep H.
Sikes William L.
Toray Industries Inc.
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