Liquid-crystal display method and information-processing apparatus applying this method
AssigneeThomson-CSF
InventorsMichel Hareng, Serge Le Berre
Life of this patent
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Abstract
The invention concerns liquid-crystal display methods and their application to radar screens. The invention provides a method which consists in thermally writing on a layer of liquid-crystal two successive patterns which are combined in accordance with a law designated A .times. B in Boolean algebra by the way of a reorienting biasing voltage applied during the writing in of the second of said pattern.
Claims7
A method for displaying a radiant energy pattern corresponding to a logical combination of two original patterns, each of said original patterns being produced in accordance with two distinct incoming electrical signals, said method comprising in the following order the steps of:
- thermally writing in one of said original patterns onto a layer of smectic liquid-crystal under the control of one of said electrical signals;
- thermally writing in the other of said original patterns onto said layer under the simultaneous control of the other of said electrical signals and of a reorienting biasing voltage applied across said layer;
- and supplying to said layer a read-out radiation for reading out said radiant energy pattern.
An apparatus for displaying a radiant energy pattern corresponding to a logical combination of two original patterns, each of said original patterns being produced in accordance with two distinct incoming electrical signals, said apparatus comprising:
- a layer of smectic liquid-crystal, writing means for thermally writing in successively each of said original patterns onto said layer, means for applying a reorienting biasing voltage across said layer during the writing in of the second of said original patterns, and means for supplying to said layer a read-out radiation for reading out said radiant energy pattern;
- said writing means having at least one input for said electrical signals.
Dependencies are inferred from the claim text.