Pressure sensor, manufacturing method thereof, and display device having the same

A method of manufacturing a pressure sensor, the method comprising:

• preparing a base substrate including an embossed pattern;
• forming a first conductive layer on the base substrate, wherein the first conductive layer has a curved surface corresponding to the embossed pattern;
• fixing the base substrate including the first conductive layer to an omnidirectional stretching device and then planarizing the curved surface of the first conductive layer by applying a tensile force to the base substrate in all directions;
• forming a pressure sensitive material layer on the first conductive layer having the planarized surface, wherein the pressure sensitive material includes a dielectric and nanoparticles dispersed in the dielectric;
• and
• forming a second conductive layer on the pressure sensitive material layer,
• where the dielectric and the nanoparticle include materials having pyroelectricities of polarities opposite to each other.

A display device comprising:

• a display panel configured to display an image;
• and
• a pressure sensor disposed on one surface of the display panel, the pressure sensor sensing the pressure of a touch applied to the display panel,
• wherein the pressure sensor includes:
• a base substrate including an embossed pattern;
• a first conductive layer disposed on the base substrate;
• a pressure sensitive material layer disposed on the first conductive layer such that its electrical characteristic is varied corresponding to a strain applied thereto, the pressure sensitive material layer including a dielectric and nanoparticles dispersed in the dielectric;
• and
• a second conductive layer disposed on the pressure sensitive material layer,
• wherein the dielectric and the nanoparticle include materials having pyroelectricities of polarities opposite to each other.