Device forming a pressure sensor, method for producing such a sensor and application in the production of a touch screen

A method for producing a device forming a pressure sensor comprising:

• a) producing a substrate that comprises an electric insulation material, said substrate comprising a first reservoir and a portion of a second reservoir in communication with the first reservoir,
• b) metallizing a base of the second reservoir to create a first electrode and a portion of an electrical connection line connected to the first electrode,
• c) producing a flexible membrane comprising an electric insulation material, said flexible membrane comprising a protuberance,
• d) metallizing a face of the membrane or a layer comprising an electric insulation material secured to the membrane on a side of the protuberance so as to create a second electrode and a portion of a second electrical connection line connected to the second electrode,
• e) filling a portion of the first reservoir with a liquid,
• f) securing the flexible membrane to the substrate so as to have the protuberance opposite the first reservoir and enable movement thereof between a position in which it is at a distance from the liquid and at least one second position in which it exerts a pressure on the liquid, thus discharging it at least partially from the first reservoir toward the second reservoir defined by the two electrodes, with mechanical contact with them, said mechanical contact of the liquid with the two electrodes establishing a variation in resistance or capacitance between the two electrodes.