US 12,147,628 B2
Display device and touch sensing system including the same
Sang Hyun Lim, Yongin-si (KR)
Assigned to SAMSUNG DISPLAY CO., LTD., Yongin-si (KR)
Filed by SAMSUNG DISPLAY CO., LTD., Yongin-si (KR)
Filed on Jan. 11, 2023, as Appl. No. 18/153,069.
Claims priority of application No. 10-2022-0077049 (KR), filed on Jun. 23, 2022.
Prior Publication US 2023/0418409 A1, Dec. 28, 2023
Int. Cl. G06F 3/041 (2006.01); G06F 3/0354 (2013.01); G06F 3/044 (2006.01); G06F 3/046 (2006.01)
CPC G06F 3/04166 (2019.05) [G06F 3/03545 (2013.01); G06F 3/0446 (2019.05); G06F 3/046 (2013.01); G06F 2203/04106 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A display device, comprising:
a display panel comprising a plurality of pixels arranged in an image display area;
a touch sensing unit disposed on a front surface of the display panel that senses a touch of a user's body part and a touch of an electronic pen;
a display driving circuit that drives the pixels of the image display area; and
a touch sensing circuit that generates touch coordinate data by detecting touch positions of the user's body part and the electronic pen,
wherein the touch sensing circuit senses the touch of the user's body part and allows the electronic pen to be charged during a touch electrode driving period by supplying touch driving signals generated by mixing driving signals of different frequency bands to touch electrodes during the touch electrode driving period,
wherein the touch electrodes comprise a plurality of driving electrodes and a plurality of sensing electrodes,
wherein the different frequency bands include a first frequency band used to sense the touch of the user's body part and a second frequency band used to sense the touch of the electronic pen,
wherein the touch sensing circuit comprises a plurality of signal analysis circuit units and a plurality of driving signal supply circuit units,
wherein the plurality of signal analysis circuit units detect touch sensing signals of the second frequency band during a sensing signal detection period after the touch electrode driving period and detect a touch of the electronic pen according to a change in an amplitude of each of the detected touch sensing signals,
wherein the plurality of driving signal supply circuit units supply touch driving signals in which first and second driving signals of the first and second frequency bands different from each other among the touch driving signals are mixed to odd-numbered driving electrodes or odd-numbered groups of driving electrodes among the driving electrodes during the touch electrode driving period of the touch sensing unit.