Display device
First Claim
1. A display device comprising a first substrate provided with row electrodes and a second substrate provided with column electrodes, in which overlapping parts of row and column electrodes with an interpositioned layer of electro-optical material define pixels of a light-modulating cell, said electro-optical layer being capable of assuming a plurality of states, at least two states of which are stable in the absence of an electric field, in said at least two states said electro-optical material having a pitch P, further comprising drive means for driving the row electrodes with selection signals and for driving the column electrodes with data signals in conformity with an image to be displayed, characterized in that:
- said first and second substrates are spaced such that said light-modulating cell has a thickness at least two times the pitch P, and, in the operating state, the drive means sequentially provide groups of p row electrodes (p>
1) with mutually orthogonal signals during a selection period.
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Accused Products
Abstract
A display device having a first substrate with row electrodes and a second substrate with column electrodes define pixels of a light-modulating cell. An electro-optical layer is capable of assuming a plurality of states with at least two states of which are stable in the absence of an electric field. The display device further has drive means for driving the row electrodes with selection signals and for driving the column electrodes with data signals in conformity with an image to be displayed. The first and second substrates are spaced such that the light-modulating cell has a thickness at least two times the pitch P of the electro-optical material. In the operating state, the drive means sequentially provide groups of p row electrodes (p>1) with mutually orthogonal signals during a selection period.
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Citations
15 Claims
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1. A display device comprising a first substrate provided with row electrodes and a second substrate provided with column electrodes, in which overlapping parts of row and column electrodes with an interpositioned layer of electro-optical material define pixels of a light-modulating cell, said electro-optical layer being capable of assuming a plurality of states, at least two states of which are stable in the absence of an electric field, in said at least two states said electro-optical material having a pitch P, further comprising drive means for driving the row electrodes with selection signals and for driving the column electrodes with data signals in conformity with an image to be displayed, characterized in that:
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said first and second substrates are spaced such that said light-modulating cell has a thickness at least two times the pitch P, and, in the operating state, the drive means sequentially provide groups of p row electrodes (p>
1) with mutually orthogonal signals during a selection period.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A display device comprising a first substrate provided with row electrodes and a second substrate provided with column electrodes, in which overlapping parts of row and column electrodes with an interpositioned layer of electro-optical material define pixels, said electro-optical layer being capable of assuming a plurality of states, at least two states of which are stable in the absence of an electric field,
further comprising drive means for driving the row electrodes with selection signals and for driving the column electrodes with data signals in conformity with an image to be displayed, characterized in that the electro-optical layer comprises chiral-nematic liquid crystal material, of which at least a focal-conic state and a planar state are stable in the absence of an electric field, and in the operating state, the drive means sequentially provide groups of p row electrodes (p> - 1) with mutually orthogonal signals during a selection period,
the drive means bring the liquid crystal material in groups of p rows of pixels to a homeotropic state, prior to a selection period, and the value p satisfies the inequality - View Dependent Claims (11, 12, 13, 14, 15)
- 1) with mutually orthogonal signals during a selection period,
Specification