Driving method for optical modulation device
First Claim
1. A driving method for an optical modulation device comprising scanning electrodes, signal electrodes disposed intersecting the scanning electrodes so as to form a pixel at each intersection of the scanning electrodes and signal electrodes, and an optical modulation material disposed between the scanning electrodes and the signal electrodes and assuming different orientation states when supplied with voltage so different polarities exceeding threshold voltages;
- said driving method comprising a first phase, a second phase and a third phase, wherein said driving method comprises the steps of;
sequentially applying voltages to all or prescribed pixels on a selected scanning electrode to write in said all or prescribed pixels in a writing period for the selected scanning electrode, the third phase in the writing period for the selected scanning electrode preceding the first phase in the writing period for a subsequently selected scanning electrode;
applying to said all or prescribed pixels voltages of one polarity sufficient for causing the optical modulation material to assume a first orientation state in the first and second phases, said voltages of one polarity having different amplitudes in the first and second phases; and
applying to a selected pixel a voltage of the other polarity sufficient causing the optical modulation material to assume a second orientation state in the third phase, and applying a voltage of the other polarity, not causing the optical modulation material to assume the second orientation state, to the other pixels, respectively of said all or prescribed pixels on the selected scanning electrode in the third phase.
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Abstract
An optical modulation device includes scanning electrodes and signal electrodes disposed opposite to an intersecting with the signal electrodes, and an optical modulation material disposed between the electrodes, a pixel being formed at each intersection of the electrodes and showing a contrast depending on the polarity of a voltage applied thereto. The device is driven by a method including in a writing period for writing in all or prescribed pixels among the pixels on a selected scanning electrode, a first phase for applying a voltage of one polarity having an amplitude exceeding a first threshold voltage of the optical modulation material to the all or prescribed pixels, and a second phase for applying a voltage of the other polarity having an amplitude exceeding a second threshold voltage of the optical modulation material to a selected pixel and applying a voltage not exceeding the threshold voltages of the optical modulation material to the other pixels, respectively among the all or prescribed pixels. The maximum duration of a continually applied voltage of the same polarity applied to a pixel on a scanning electrode is 2.5 times the duration fo the first phase in the writing period.
53 Citations
23 Claims
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1. A driving method for an optical modulation device comprising scanning electrodes, signal electrodes disposed intersecting the scanning electrodes so as to form a pixel at each intersection of the scanning electrodes and signal electrodes, and an optical modulation material disposed between the scanning electrodes and the signal electrodes and assuming different orientation states when supplied with voltage so different polarities exceeding threshold voltages;
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said driving method comprising a first phase, a second phase and a third phase, wherein said driving method comprises the steps of; sequentially applying voltages to all or prescribed pixels on a selected scanning electrode to write in said all or prescribed pixels in a writing period for the selected scanning electrode, the third phase in the writing period for the selected scanning electrode preceding the first phase in the writing period for a subsequently selected scanning electrode; applying to said all or prescribed pixels voltages of one polarity sufficient for causing the optical modulation material to assume a first orientation state in the first and second phases, said voltages of one polarity having different amplitudes in the first and second phases; and applying to a selected pixel a voltage of the other polarity sufficient causing the optical modulation material to assume a second orientation state in the third phase, and applying a voltage of the other polarity, not causing the optical modulation material to assume the second orientation state, to the other pixels, respectively of said all or prescribed pixels on the selected scanning electrode in the third phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An optical modulation apparatus comprising:
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an optical modulation device comprising scanning electrodes, signal electrodes disposed intersecting the scanning electrodes so as to form a pixel at each intersection of the scanning electrodes and signal electrodes, and an optical modulation material disposed between the scanning electrodes and signal electrodes and assuming different orientation states when supplied with voltages of different polarities exceeding threshold voltages; and a driving unit for driving the optical modulation device according to a method which comprises the steps of; sequentially applying voltages to all or prescribed pixels on a selected scanning electrode to write in said all or prescribe pixels of the selected scanning electrode in a writing period comprising first, second, and third phases, wherein the third phase in the writing period for the selected scanning electrode precedes the first phase in the writing period for a subsequently selected scanning electrode; applying voltages of one polarity to said all or prescribed pixels in the first and second phases which are sufficient for causing the optical modulation material to assume a first orientation state, said voltages of one polarity having different amplitudes in the first and second phases; applying a voltage of the other polarity in the third phase to a selected pixel which is sufficient for causing the optical modulation material to assume a second orientation state; and applying, in the third phase, a voltage of the other polarity, not causing the optical modulation material to assume the second orientation state, to the other pixels, respectively of said all or prescribed pixels on the selected scanning electrode. - View Dependent Claims (20, 21, 22, 23)
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Specification