US 12,079,427 B2
Input touch device that detects the amount of negative capacitance change due to coupling between an object and a predetermined driving electrode
Bonkee Kim, Seongnam-si (KR); Seyeob Kim, Seongnam-si (KR); Jongsik Kim, Seongnam-si (KR); and Sein Lee, Seongnam-si (KR)
Assigned to HiDeep Inc., (KR)
Appl. No. 17/600,465
Filed by HiDeep Inc., Seongnam-si (KR)
PCT Filed Feb. 11, 2020, PCT No. PCT/KR2020/001925
§ 371(c)(1), (2) Date Apr. 25, 2022,
PCT Pub. No. WO2020/204345, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 10-2019-0038292 (KR), filed on Apr. 2, 2019.
Prior Publication US 2022/0253173 A1, Aug. 11, 2022
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01); H10K 59/40 (2023.01)
CPC G06F 3/0418 (2013.01) [G06F 3/0446 (2019.05); G06F 3/0447 (2019.05); H10K 59/40 (2023.02); G06F 2203/04112 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A touch input device including a touch surface, comprising:
a display panel disposed under the touch surface;
a touch sensor which is disposed under the touch surface and includes a plurality of driving electrodes, a plurality of receiving electrodes, and a plurality of dummy receiving electrodes; and
a touch detection unit configured to detect a touch position of an object input to the touch surface based on a detection signal output from the plurality of receiving electrodes of the touch sensor,
wherein the touch detection unit detects the touch position of the object input to the touch surface by subtracting a second detection signal output from a dummy receiving electrode that does not form mutual capacitance with a predetermined driving electrode among the plurality of dummy receiving electrodes from a first detection signal output from a predetermined receiving electrode that forms mutual capacitance with the predetermined driving electrode among the plurality of receiving electrodes,
wherein the first detection signal includes information on an amount of mutual capacitance changed between the predetermined driving electrode and the predetermined receiving electrode and noise information,
the second detection signal includes the noise information, and
the noise information includes display noise information of the display panel, noise information by a conversion of an image displayed on the display panel, and information on an amount of negative (−) capacitance changed by an LGM signal generated by coupling between the object and the predetermined driving electrode,
wherein when a driving signal is applied to another driving electrode different from the predetermined driving electrode, the first detection signal is output from a second receiving electrode, and the second detection signal is output from a first receiving electrode of the plurality of receiving electrodes.