Liquid crystal display with high contrast - which is achieved using dye to make excited crystal white against normal dark background

摘要

The liquid crystal display consists of a liquid crystal (1) between two glass plates (2). The insides of the glass plates have transparent electrodes (e.g. evaporated tin oxide). A light guide (3) is located in the outside of one glass plate between it and the rear light source (4). The light guide consists of black laminae (5). These laminae are visible from the front when no voltage is applied to the liquid crystal. When a voltage is applied light from the rear source is scattered inside the crystal to give a light display against a dark background. The same applies if the light is incident from the front instead of from the rear. The liquid crystal contains a dye that forms white with the crystal's own colouring when the crystal is excited. Alternatively a coloured light source of coloured front glass may be used to attain the same result.