Patent ID: 7397181

Claim:
Image display panel formed from a matrix of electroluminescent cells having a memory effect, which are capable of emitting light towards the front of the said panel, comprising: an electroluminescent organic layer; to the front of this layer, a transparent front layer of electrodes; to the rear of this layer, a photoconducting layer for obtaining the said memory effect, the said photoconducting layer itself being inserted between an opaque rear layer of electrodes and an intermediate transparent or semi-transparent layer of intermediate electrodes in contact with the electroluminescent layer, wherein each cell is provided with and intermediate electrode and in that the intermediate electrodes of the various cells are electrically isolated from one another; and an opaque layer lying between the said electroluminescent layer and the said photoconducting layer which itself includes, within each cell of the panel, a group of at least one optical coupling aperture passing through the said opaque layer, wherein said panel comprises at least two groups of electroluminescent cells E 1 , E 2 ′ which are capable of emitting light of a different color and wherein the density of apertures and/or the sum of the areas of the apertures of a group of apertures differ/differs depending on the said groups of cells E 1 , E 2 ′ of different color.