Patent ID: 11921946
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A display device comprising:
a piezoelectric sensor layer including a piezoelectric sensor comprising a piezoelectric element;
a display panel disposed on the piezoelectric sensor layer; and
an alternating current (AC) voltage generator, wherein the piezoelectric element is included in the AC voltage generator,
wherein the piezoelectric sensor includes a sensing circuit, and wherein the sensing circuit is configured to measure a change in impedance of the piezoelectric element when an AC voltage having a resonance frequency of the piezoelectric element is input to the piezoelectric element,
wherein the piezoelectric sensor includes an oscillation circuit comprising the piezoelectric element, and wherein the sensing circuit is connected to the oscillation circuit, and
wherein the sensing circuit comprises a frequency counter, which is configured to indicate whether the resonance frequency is shifted or not.