Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1997-01-07
1998-07-07
Luu, Matthew
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 89, 345 96, G09G 336
Patent
active
057775931
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. TECHNICAL FIELD
The present invention relates to a driving method and system for an antiferroelectric liquid-crystal display device using an antiferroelectric liquid crystal as a liquid-crystal layer and having pixels in the form of a matrix. In particular, this invention is concerned with a gray-scale display method and system for an antiferroelectric liquid-crystal display device. The present invention can be adopted widely for a liquid-crystal display panel, liquid-crystal light shutter array, and the like.
2. BACKGROUND ART
As is already known, a liquid crystal in which dipoles have spontaneous polarizations whose orientations are spontaneously aligned with one another due to dipole interaction, and the orientations of the spontaneous polarizations are reversed with application of an external electric field is referred to as a ferroelectric liquid crystal. In contrast, a liquid crystal in which dipoles of adjoining molecules in a liquid-crystal layer are arranged in anti-parallel so that the spontaneous polarizations of the dipoles are canceled out, and thus exhibit an antiferroelectric state is referred to as an antiferroelectric liquid crystal.
In recent years, many studies and practical application have been made on the former ferroelectric liquid crystal, and the ferroelectric liquid crystal has been applied to various products. However, as is well known, there is a demand for further improvements in terms of the luminance, responsiveness, angle of visibility, and the like of a display screen.
In contrast, as for the latter antiferroelectric liquid crystal, for example, Japanese Unexamined Patent Publication No. 2-173724 has suggested that the angle of visibility is larger than that permitted by a known nematic liquid crystal, the response speed is higher, and the multiplexing ability is better. The antiferroelectric liquid crystal is under earnest study in various aspects.
The present invention attempts to improve a gray-scale display method for an antiferroelectric liquid-crystal display screen as part of a driving method for a display device adopting the latter antiferroelectric liquid crystal. According to the present invention, there is provided a gray-scale display method and system making it possible to reduce the cost of an antiferroelectric liquid-crystal display device and minimize the power consumption.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a driving method for a display device adopting an antiferroelectric liquid crystal, or in particular, a gray-scale display method and system making it possible to reduce the cost of an antiferroelectric liquid-crystal display device and minimize the power consumption by improving a gray-scale display method for a liquid-crystal display screen.
According to the present invention, there is provided a driving method for an antiferroelectric liquid-crystal display device including pixels in the form of a matrix and having an antiferroelectric liquid crystal interposed between a pair of substrates. The antiferroelectric liquid crystal assumes a first ferroelectric state, a second ferroelectric state to be set with application of a voltage that is opposite in polarity to a voltage to be applied to set the first ferroelectric state, and an antiferroelectric state.
Writing of pixels is carried out during at least two consecutive scanning periods. Each scanning period is composed of a plurality of frames. Furthermore, an average value of amounts of light transmitted during the plurality of frames is set as an amount of light transmitted by pixels. Moreover, both frames during which the antiferroelectric liquid crystal exhibits the first ferroelectric state and frames during which the antiferroelectric liquid crystal exhibits the second ferroelectric state are not included in the same scanning period.
According to the present invention, one scanning period includes frames during which the first ferroelectric state is set and frames during which the antiferroelectric state is set or to includes frames dur
REFERENCES:
patent: 5459481 (1995-10-01), Tanaka et al.
Citizen Watch Co. Ltd.
Luu Matthew
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