Method and apparatus for driving ferroelectric liquid crystal, optical modulation device to achieve gradation
First Claim
1. A driving method for an optical modulation device comprising first electrodes and second electrodes disposed opposite to and intersecting with the first electrodes, and an optical modulation material providing a first and a second orientation state depending on an electric field applied thereto disposed between the first electrodes and the second electrodes, a pixel being formed at each intersection of the first electrodes and the second electrodes so as to form a matrix of pixels as a whole;
- said driving method comprising;
applying an alternating address voltage signal comprising a fore pulse and a rear pulse to an addressed electrode among the first electrodes; and
applying, to the second electrodes, a first voltage signal for orienting the pixels on the addressed electrode to the first orientation state in phase with the fore pulse, and a second voltage signal for providing a pixel among the pixels on the addressed electrode with a prescribed areal ratio between the first and second orientation states in the pixel depending on given gradation data;
the first and second voltage signals being set to have substantially the same absolute value.
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Accused Products
Abstract
An optical modulation device comprises first electrodes and second electrodes disposed opposite to and intersecting with the signal electrodes, and an optical modulation material providing a first and a second orientation state depending on an electric field applied thereto disposed between the first electrodes and the second electrodes, a pixel being formed at each intersection of the first electrodes and the second electrodes so as to form a matrix of pixels as a whole. The optical modulation device is driven by applying an alternating address voltage signal comprising a fore pulse and a rear pulse to an addressed electrode among the first electrodes; and applying, to the second electrodes, a first voltage signal for orienting the pixels on the addressed electrode to the first orientation state in phase with the fore pulse, and a second voltage signal for providing a pixel among the pixels on the addressed electrode with a prescribed areal ratio between the first and second orientation states in the pixel depending on given gradation data; the first and second voltage signals being set to have substantially the same absolute value.
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Citations
12 Claims
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1. A driving method for an optical modulation device comprising first electrodes and second electrodes disposed opposite to and intersecting with the first electrodes, and an optical modulation material providing a first and a second orientation state depending on an electric field applied thereto disposed between the first electrodes and the second electrodes, a pixel being formed at each intersection of the first electrodes and the second electrodes so as to form a matrix of pixels as a whole;
- said driving method comprising;
applying an alternating address voltage signal comprising a fore pulse and a rear pulse to an addressed electrode among the first electrodes; and applying, to the second electrodes, a first voltage signal for orienting the pixels on the addressed electrode to the first orientation state in phase with the fore pulse, and a second voltage signal for providing a pixel among the pixels on the addressed electrode with a prescribed areal ratio between the first and second orientation states in the pixel depending on given gradation data;
the first and second voltage signals being set to have substantially the same absolute value. - View Dependent Claims (2, 3, 4, 5, 6)
- said driving method comprising;
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7. An optical modulation apparatus, comprising:
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an optical modulation device comprising first electrodes and second electrodes disposed opposite to and intersecting with first electrodes, and an optical modulation material providing a first and a second orientation state depending on an electric field applied thereto disposed between the first electrodes and the second electrodes, a pixel being formed at each intersection of the first electrodes and the second electrodes so as to form a matrix of pixels as a whole; means for applying an alternating address voltage signal comprising a fore pulse and a rear pulse to an addressed electrode among the first electrodes; and means for applying, to the second electrodes, a first voltage signal for orienting the pixels on the addressed electrode to the first orientation state in phase with the fore pulse, and a second voltage signal for providing a pixel among the pixels on the addressed electrode with a prescribed areal ratio between the first and second orientation states in the pixel depending on given gradation data;
the first and second voltage signals being set to have substantially the same absolute value. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification