Method of making liquid crystal display device having extended service life

Claim 1

A process of preparation of a field-effect liquid crystal display device, comprising the steps of depositing a film of a synthetic resin on one surface of each of two glass plates each glass plate having at least one transparent electrode on said one surface, said film being thick enough to be grooved and thin enough to interfere only negligibly with the transmission of visible light therethrough, orienting said films by forming minute unidirectional grooves thereon, bringing said plates together with a spacer therebetween positioned adjacent the edges of said plates to form a cell, at least one of said plates being apertured, said plates being so positioned that said films are on adjacent surfaces and the orientations of said films are at right angles to each other, heating said plates and spacer to a temperature at which said spacer softens but at which said synthetic resin film is undamaged, said spacer being selected to have a softening point below the flow or degradation temperature of said synthetic film, pressing said plates together to cause said spacer to flow and conform to the surface of said plates, and maintaining said plates and spacer at said temperature until essentially all volatiles including moisture are driven off from the interior of said cell.