Liquid crystal cells – elements and systems – Particular structure – Detector of liquid crystal temperature
Patent
1998-09-28
2000-09-05
Dudek, James A.
Liquid crystal cells, elements and systems
Particular structure
Detector of liquid crystal temperature
349100, 349161, G02F 1133
Patent
active
061150916
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a liquid crystal display. More particularly, the first aspect of the present invention is concerned with an antiferroelectric liquid crystal panel having an antiferroelectric liquid crystal as a liquid crystal layer, and a backlight for illuminating the panel. The second aspect of the present invention is concerned with adjustment of an angle of rotation by which sheet polarizers included in a liquid crystal panel, which has an antiferroelectric liquid crystal or ferroelectric liquid crystal as a liquid crystal layer, are turned. The third aspect of the present invention is concerned with arrangement of sheet polarizers, and with a ferroelectric liquid crystal panel having a ferroelectric liquid crystal as a liquid crystal layer and a backlight for illuminating the panel.
1. Background Art
In general, a liquid crystal is broadly divided into a dielectrically anisotropic type and ferroelectric type in terms of an electro-optic effect (phenomenon where when one aligned state of liquid crystalline molecules is changed into another with application of an electric field, an optical property of a liquid crystal panel is varied to electrically cause light modulation). A typical liquid crystal of the former type is a super-twisted nematic (STN) liquid crystal, and a liquid crystal of the latter type is subdivided into a memory type and non-memory type.
The present invention relates to a liquid crystal display belonging to the latter type. A liquid crystal unit is composed of a liquid crystal panel having an antiferroelectric liquid crystal or ferroelectric liquid crystal as a liquid crystal layer, and a backlight for illuminating the liquid crystal panel. For improving image quality offered by the liquid crystal unit, an amount of light output from the backlight is adjusted according to a change in conical angle, a change in temperature of use or temperature at which the liquid crystal panel is usable, a change in polarization reverse current, or a change in transmitted light. Furthermore, an angle at which two sheet polarizers are arranged is adjusted according to the change.
2. Disclosure of the Invention
The first object of the present invention is to provide an antiferroelectric liquid crystal unit. In the antiferroelectric liquid crystal unit, a change in conical angle, a change in temperature of use or temperature at which a liquid crystal panel is usable, a change in polarization reverse current, or a change in transmitted light may occur in a liquid crystal panel having an antiferroelectric liquid crystal. In this case, an amount of light output from a backlight is adjusted in order to minimize a change in contrast ratio for display, and to prevent a power consumption of the backlight from increasing.
The second object of the present invention is to provide a liquid crystal unit. In the liquid crystal unit, a change in conical angle, a change in temperature of use or temperature at which a liquid crystal is usable, a change in polarization reverse current, or a change in transmission light may occur in a liquid crystal panel having an antiferroelectric liquid crystal or ferroelectric liquid crystal. In this case, an angle at which sheet polarizers are arranged is adjusted in order to attain a maximum contrast ratio.
The third object of the present invention is to provide a ferroelectric liquid crystal unit. In the ferroelectric liquid crystal unit, a change in conical angle, a change in temperature of use or temperature at which a liquid crystal panel is usable, a change in polarization reverse current, or a change in transmission light may occur in a liquid crystal panel having a ferroelectric liquid crystal. In this case, an amount of light output from a backlight is adjusted in order to minimize a change in contrast ratio for display and to prevent the power consumption of the backlight from increasing.
For accomplishing the first object of the present invention, the first aspect of the present invention is realized in the forms described below.
In the f
REFERENCES:
patent: 4941736 (1990-07-01), Taniguchi et al.
patent: 5109291 (1992-04-01), Inaba
patent: 5293534 (1994-03-01), Mihara
patent: 5623351 (1997-04-01), Kondoh
patent: 5638143 (1997-06-01), Hughes et al.
Fukushima Toshiaki
Kondoh Shinya
Ohara Mie
Citizen Watch Co. Ltd.
Dudek James A.
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