Liquid crystal device and driving method therefor
First Claim
1. A liquid crystal device comprising a plurality of picture elements arranged in a plurality of rows;
- each picture element comprising a pair of oppositely spaced electrodes and a ferroelectric liquid crystal disposed between the electrodes and showing a first stable state and a second stable state depending on an electric field applied;
said liquid crystal device being driven by sequentially orienting the ferroelectric liquid crystal at selected picture elements on a selected row to the first or second stable state to write in the picture elements row by row;
said ferroelectric liquid crystal having a volume resistivity of 1×
109 Ω
.cm or larger.
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Accused Products
Abstract
A liquid crystal device for time-division driving comprising a plurality of picture elements arranged in a plurality of rows. Each picture element is composed of opposite electrodes, a layer of a ferroelectric liquid crystal having a volume resistivity of 1×109 Ω.cm or larger, disposed between the opposite electrodes and placed under bistability condition, and an insulating layer disposed on at least one of the opposite electrodes. The liquid crystal device is adapted to driving according to a time-division driving scheme wherein a writing signal is applied row by row and cyclically to the picture elements, and a particular row of picture elements to which the writing signal has been applied in a writing cycle retain their written states until a writing signal is applied to the particular row in a subsequent writing cycle.
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Citations
31 Claims
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1. A liquid crystal device comprising a plurality of picture elements arranged in a plurality of rows;
- each picture element comprising a pair of oppositely spaced electrodes and a ferroelectric liquid crystal disposed between the electrodes and showing a first stable state and a second stable state depending on an electric field applied;
said liquid crystal device being driven by sequentially orienting the ferroelectric liquid crystal at selected picture elements on a selected row to the first or second stable state to write in the picture elements row by row; said ferroelectric liquid crystal having a volume resistivity of 1×
109 Ω
.cm or larger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- each picture element comprising a pair of oppositely spaced electrodes and a ferroelectric liquid crystal disposed between the electrodes and showing a first stable state and a second stable state depending on an electric field applied;
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18. A driving method for a liquid crystal device comprising a plurality of picture elements arranged in a plurality of rows;
- each picture element comprising a ferroelectric liquid crystal showing a first stable state and a second stable state depending on an electric field applied thereto and having a volume resistivity of 1×
109 Ω
.cm or largersaid driving method comprising;
orientating the ferroelectric liquid crystal at a picture element on a selected row to the first or second stable state to write in the picture elements row by row; andapplying a voltage signal of an alternating waveform to the ferroelectric liquid crystal at the picture element on a nonselected row. - View Dependent Claims (19, 20, 21, 22, 23, 31)
- each picture element comprising a ferroelectric liquid crystal showing a first stable state and a second stable state depending on an electric field applied thereto and having a volume resistivity of 1×
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24. A driving method for a liquid crystal device comprising a plurality of picture elements arranged two-dimensionally;
- each picture element comprising opposite electrodes, a layer of a ferroelectric liquid crystal having a volume resistivity of 1×
109 Ω
.cm or larger and disposed between the opposite electrodes and having a first display state and a second display state;said driving method comprising; applying a first writing signal of a polarity for producing a first display state and a holding signal of a reverse polarity for holding the first display state respectively to a selected first group of picture elements among said plurality of picture elements, and applying a second writing signal for producing a second display state respectively to a remaining second group of picture elements. - View Dependent Claims (25, 26, 27, 28, 29, 30)
- each picture element comprising opposite electrodes, a layer of a ferroelectric liquid crystal having a volume resistivity of 1×
Specification