US 12,130,984 B2
Display device having touch sensor and driving method of the same
Jong Hee Hwang, Paju-si (KR); Bo Gun Seo, Paju-si (KR); and Kyoung Hwan Kim, Paju-si (KR)
Assigned to LG DISPLAY CO., LTD., Seoul (KR)
Filed by LG DISPLAY CO., LTD., Seoul (KR)
Filed on Aug. 29, 2022, as Appl. No. 17/897,482.
Claims priority of application No. 10-2021-0173501 (KR), filed on Dec. 7, 2021.
Prior Publication US 2023/0176684 A1, Jun. 8, 2023
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/04166 (2019.05) [G06F 3/04164 (2019.05); G06F 3/0443 (2019.05); G06F 2203/04112 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A display device comprising:
a pixel unit including a sensing region where first pixels are disposed at a first PPI (pixels per inch) and a display region where second pixels are disposed at a second PPI higher than the first PPI;
a touch sensor unit disposed on the pixel unit and including a first touch sensor region where touch sensors are disposed at a first electrode density and a second touch sensor region where touch sensors are disposed at a second electrode density higher than the first electrode density;
a display panel driver configured to drive the pixel unit; and
a touch sensor driver configured to:
sense a touch signal from the first touch sensor region overlapping the sensing region of the first touch sensor region and the second touch sensor region, and
change at least one of a voltage level of a driving pulse applied to the first touch sensor region and an accumulated number of touch signals sensed from the first touch sensor region based on the touch signals sensed from the first touch sensor region when a touch on the first touch sensor region overlapping the sensing region occurs,
wherein the first touch sensor region overlaps the sensing region, and the second touch sensor region does not overlap the sensing region,
wherein at least one optical sensor is disposed in the sensing region, and
wherein the voltage level of a driving pulse applied to the first touch sensor region and the accumulated number of touch signals sensed from the first touch sensor region is not changed when the touch on the first touch sensor region does not occur.