Patent ID: 6753937
Filing Date: 2004-06-22
Classification: G02F

Abstract:
A reflective liquid crystal display device including a first substrate arranged on a front side, i.e. arranged on the side receiving an incident light, and a second substrate arranged on a back side, so that this second substrate extends facing the front substrate parallel thereto, the first and second substrates being connected via a sealing frame in order to delimit between them a cavity for containing liquid crystal and including on their opposite faces a first and a second group of electrodes respectively, the display device being connected to a control circuit supplying suitable control voltages to selected electrodes in order to modify the optical conditions of the liquid crystal into a reflective state or into a transparent state, said display device further including an absorbent black layer made of an electrically non-conductive material, wherein the absorbent black layer is arranged either at the surface of the second substrate or on the second group of electrodes that is formed on the second substrate,wherein the second group of electrodes is made of a black-coloured electrically conductive material, and is associated with the absorbent layer which is also black and made of a electrically non-conductive material whose reflection coefficient is close or equal to that of the material used to elaborate the electrodes, this layer covering at least the parts not covered by the electrodes, so that, in the zones where the liquid crystal is switched into a transparent or reflective state, the light can be absorbed either by the absorbent black layer or by the second group of electrodes and provides a high-contrast display of homogenous colour over the entire surface of said display device.