Patent ID: 7884897

Claim:
A liquid crystal display device including a display face orientated towards the top of the device, on the side of an observer, said device including: a liquid crystal cell including at least one top substrate and one bottom substrate, at least two electrodes and at least one counter-electrode which are structured on the opposite faces of the two substrates, each electrode representing a figurative pattern or a portion of a figurative pattern; a control unit which controls the liquid crystal cell by applying a control voltage of a determined value between a selected electrode and the counter-electrode so as to alter the orientation of the liquid crystals and cause the display of the corresponding figurative patterns, and a backlighting module arranged underneath the liquid crystal cell, on the side opposite the display face, including at least a first and a second light source of different colours which emit light rays inside at least one light guide, wherein the light guide includes a plurality of prisms which deflect the light rays towards the display face, a first series of prisms being orientated towards the first light source to deflect the light rays emitted by the first source and a second series of prisms being orientated towards the second light source to deflect the light rays emitted by the second source, and wherein the prisms are distributed in zones of the light guide which are located underneath the electrodes, so that the light rays coming from the top face of the light guide are concentrated on the electrodes.