Patent ID: 6678217
Filing Date: 2004-01-13
Classification: G02F,G04G

Abstract:
A chromatic contrast inversion display assembly including a first display device in front of which is arranged a second active liquid crystal display device including, starting from the exterior, a front polariser, a liquid crystals LC1 dot-matrix or digit display cell with two switching states, an intermediate polariser, a liquid crystals LC2 optical valve having at least two switching states and a rear polariser, wherein four switching states of said cell and said valve are determined by a control unit, characterised in that in the second display device, the front polariser is selective of a first colour â€œVâ€ , the intermediate polariser is selective of a second colour â€œRâ€  and the rear polariser is reflective when the first display device has a dark background and absorbent when the first display device has a light background and in that the control unit allows two switching states to be selected allowing the colour of the information displayed, or that of the background on which said information is displayed to be reversed.