Stereoscopic surface display device and operation method of the same

A stereoscopic surface display device comprising a stereoscopic display unit having a plurality of cell areas,

• wherein the stereoscopic display unit comprises;
• a first flexible layer;
• a plurality of lower optical output units in the first flexible layer, the plurality of lower optical output units being disposed in the plurality of cell areas, respectively;
• a first photothermal response layer on the first flexible layer, wherein the first photothermal response layer is configured to receive lower light emitted from the plurality of lower optical output units and emit first thermal energy;
• a shape deformation layer on the first photothermal response layer;
• a second photothermal response layer on the shape deformation layer;
• a second flexible layer on the second photothermal response layer;
• and
• a plurality of upper optical output units in the second flexible layer,
• wherein the second photothermal response layer is configured to receive upper light emitted from the plurality of upper optical output units and emit second thermal energy.

An operating method of a stereoscopic surface display device including a stereoscopic display unit having a cell area,

• wherein the stereoscopic display unit comprises:
• a flexible layer;
• an optical waveguide and an optical output unit that are in the flexible layer, the optical output unit being disposed in the cell area;
• a light source disposed on a side of the stereoscopic display unit, the optical waveguide connecting the light source and the optical output unit;
• a photothermal response layer on the flexible layer;
• and
• a shape deformation layer on the photothermal response layer,
• wherein the operating method comprises:
• irradiating incident light from the light source to the optical waveguide, the optical waveguide guiding the incident light to the optical output unit;
• emitting output light from the optical output unit to the photothermal response layer, the photothermal response layer receiving the output light and generating thermal energy;
• heating the shape deformation layer using the thermal energy, the shape deformation layer being heated so that a modulus of elasticity in the shape deformation layer decreases and a coefficient of thermal expansion in the shape deformation layer increases;
• and
• generating bending deformation in the shape deformation layer through a difference between the increased coefficient of thermal expansion of the shape deformation layer and a coefficient of thermal expansion of the photothermal response layer.