Patent ID: 8702005

Claim:
A bank note, value-bearing document or identity card having a security element disposed on or within a carrier substrate, the security element comprising: a first electrode layer; a second electrode layer, said second electrode layer having an optically diffractive structure comprising a diffractive surface relief shaped in an interface surface thereof; and a polymer display layer formed from a light-emitting polymer disposed between said first and second electrode layers, wherein said second electrode layer forms an optically variable device, said optically variable device producing a visible first optical effect, said visible first optical effect only being produced due to said diffractive surface relief structure formed on said second electrode and varying depending on a change of at least one of a change in viewing direction and a change in illumination direction, and wherein said first electrode layer, said second electrode layer and said polymer display layer together form an electrically active optical display element, said optical display element being an organic light emitter diode (OLED) and producing a second optical effect upon electrical activation, and wherein said second electrode layer performs a dual function of providing electrical energy to said electrically active optical display element and producing said visible first optical effect, and wherein the first optical effect produced by the optically variable device changes in color or in image upon a change of at least one of a change in viewing direction and a change in illumination.