A liquid crystal cell for a liquid crystal display screen having a pair of plates joined together by a frame to form a chamber for a liquid crystal layer which is hermetically sealed from the exterior of the cell and has a closable access passage characterized by the access passage receiving a ductile metal plug of a metal which is selected from a group consisting of indium, tin, lead and aluminum and a sealing coating covering the plug and a portion of the exterior of the cell surrounding the passage. In one embodiment, the passage is a groove extending inward from an edge of one of the plates and has a depth which decreases as the distance from the edge increases so that it merges with the interior surface of the plate inward of the frame which may be formed with the recess facing the groove. In another embodiment, the passages are apertures having axes which are perpendicular to the plate and are arranged in a region of the plate adjacent to the frame means preferably with an aperture at opposite or diametric corners of the cell. In both embodiments, the sealing coating may be a synthetic adhesive or a portion of the exterior of the cell surrounding the passage or the aperture is metalized with a bright metal film with the metal being selected from a group consisting of silver, gold and platinum and the sealing coating is a layer of solder applied onto the metalized film.