Liquid crystal cell having an insulating layer of a silicon oxide base
First Claim
1. In a liquid crystal cell having a pair of spaced carrier plates with inner surfaces forming a cavity for receiving a layer of liquid crystal material, each of said inner surfaces being provided with conductive coatings, at least one of the carrier plates having its conductive coating provided with an insulating layer of a silicon oxide base with the improvement comprising wherein the insulating layer of silicon oxide contains an additive selected from a group consisting of boron oxide, tin oxide, titanium oxide and mixtures thereof so that the insulating layer causes homeotropic orientation of the molecules of the liquid crystal layer.
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Abstract
A liquid crystal cell having a pair of spaced carrier plates with inner surfaces forming a cavity for receiving a layer of liquid crystal material, each of said inner surfaces being provided with a conductive coating and at least one of the carrier plates having its conductive coating covered with an insulated layer of silicon oxide base characterized by the insulating layer containing an additive selected from a group consisting of boron oxide, tin oxide, titanium oxide and mixtures thereof so that the insulating layer causes homeotropic orientation of the molecules of the liquid crystal layer.
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Citations
16 Claims
- 1. In a liquid crystal cell having a pair of spaced carrier plates with inner surfaces forming a cavity for receiving a layer of liquid crystal material, each of said inner surfaces being provided with conductive coatings, at least one of the carrier plates having its conductive coating provided with an insulating layer of a silicon oxide base with the improvement comprising wherein the insulating layer of silicon oxide contains an additive selected from a group consisting of boron oxide, tin oxide, titanium oxide and mixtures thereof so that the insulating layer causes homeotropic orientation of the molecules of the liquid crystal layer.
- 6. A process for production of an insulating layer, which promotes homeotropic orientation of a liquid crystal cell comprising the steps of providing a solution containing silicon and an additive selected from a group consisting of boron, tin, titanium and mixtures thereof in a desired ratio to each other, applying the solution to the carrier plate of the liquid crystal cell, which plate is to be provided with the insulating layer, and finally, transforming the applied solution into the insulating layer by thermal decomposition to form the insulating layer composed of silicon oxide and oxides of the additive.
Specification