Security element for the identification of a security document using liquid crystal display driven with piezoelectric energy source and method for producing it

A security element for the identification of a security document comprising:

• a flexible multilayered film body defining a plane comprising:
• at least one electrically controllable display element;
• and
• at least one piezoelectric energy source which controls the at least one display element and having at least one layer of piezoelectric material;
• the at least one electrically controllable display element containing a display layer having liquid crystals that orient in response to an applied electric field;
• the multilayered body having a thickness of at most 70 μm in a direction perpendicular to the plane of the film body;
• wherein the film body includes a first carrier film and a first electrode layer, the at least one layer composed of piezoelectric material being on the first electrode layer, said display layer being coplanar with the piezoelectric material on the first electrode layer, the body including a transparent adhesive layer, a transparent second electrode layer, and a transparent protective layer, at least one of the first and second electrode layers having a diffractive relief structure which generates an optically variable effect;
• the relief structure being arranged in a first region of the one first and second electrode layers, said first region overlapping the layer composed of piezoelectric material, and/or is arranged in a second region of the at least one first and second electrode layers, said second region overlapping the display layer;
• and
• a supporting layer for the display layer forming a frame around the display element as viewed perpendicular to the plane of the film body;
• the supporting layer forming at least one web, which web overlaps the display layer, and which supporting layer, when viewed perpendicular to the first carrier film, forms a linear, punctiform, or areal structure, the supporting layer being arranged to contribute to the mechanical stabilization of the display element.

A security element for the identification of a security document comprising:

• a flexible multilayered film body defining a plane comprising:
• at least one electrically controllable display element;
• and
• at least one piezoelectric energy source which controls the at least one display element and having at least one layer of piezoelectric material;
• the at least one electrically controllable display element containing a display layer having liquid crystals that orient in response to an applied electric field;
• the multilayered body having a thickness of at most 70 μm in a direction perpendicular to the plane of the film body;
• wherein the film body includes a first carrier film and a first electrode layer, the at least one layer composed of piezoelectric material being on the first electrode layer, said display layer being in the same plane as the piezoelectric material on the first electrode layer, the body including a transparent adhesive layer, a transparent second electrode layer, and a transparent protective layer, at least one of the first and second electrode layers having a diffractive relief structure which generates an optically variable effect, the diffractive relief structure being introduced into a surface of the first carrier film and which surface faces the first electrode layer;
• and
• a supporting layer for the display layer forming a frame around the display element as viewed perpendicular to the plane of the film body;
• the supporting layer forming at least one web, which web overlaps the display layer, and which supporting layer, when viewed perpendicular to the first carrier film, forms a linear, punctiform, or areal structure, the supporting layer being arranged to contribute to the mechanical stabilization of the display element.