US 11,921,946 B2
Display device including a piezoelectric sensor layer
Do Ik Kim, Suwon-si (KR); Gwang Bum Ko, Suwon-si (KR); and Sung Hwan Kim, Yongin-si (KR)
Assigned to SAMSUNG DISPLAY CO., LTD., Yongin-si (KR)
Filed by SAMSUNG DISPLAY CO., LTD., Yongin-si (KR)
Filed on Aug. 22, 2022, as Appl. No. 17/821,455.
Application 17/821,455 is a division of application No. 16/196,168, filed on Nov. 20, 2018, abandoned.
Claims priority of application No. 10-2017-0168375 (KR), filed on Dec. 8, 2017.
Prior Publication US 2022/0397974 A1, Dec. 15, 2022
Int. Cl. G06F 3/041 (2006.01); G06F 3/043 (2006.01); H10K 50/84 (2023.01); H10K 59/40 (2023.01); H10N 30/30 (2023.01); G06F 3/044 (2006.01); G06F 3/046 (2006.01); H10K 59/12 (2023.01)
CPC G06F 3/0414 (2013.01) [G06F 3/04144 (2019.05); G06F 3/0416 (2013.01); G06F 3/043 (2013.01); H10K 50/841 (2023.02); H10K 59/40 (2023.02); H10N 30/302 (2023.02); G06F 3/0412 (2013.01); G06F 3/044 (2013.01); G06F 3/046 (2013.01); G06F 2203/04101 (2013.01); G06F 2203/04105 (2013.01); H10K 59/12 (2023.02)] 13 Claims
OG exemplary drawing
 
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.