US 12,437,694 B2
Display device having touch sensor and driving method of the same
Dong Gun Lee, Paju-si (KR); Bo Gun Seo, Paju-si (KR); Kyu Jin Kim, Paju-si (KR); Seung Taek Oh, Paju-si (KR); and Bo Yun Jung, Paju-si (KR)
Assigned to LG DISPLAY CO., LTD., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on Jun. 16, 2023, as Appl. No. 18/211,081.
Claims priority of application No. 10-2022-0188897 (KR), filed on Dec. 29, 2022.
Prior Publication US 2024/0221581 A1, Jul. 4, 2024
Int. Cl. G09G 3/20 (2006.01); G09G 3/3233 (2016.01)
CPC G09G 3/2074 (2013.01) [G09G 3/2096 (2013.01); G09G 3/3233 (2013.01); G09G 2300/0452 (2013.01); G09G 2300/0842 (2013.01); G09G 2330/021 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A display device comprising:
a display panel including a first pixel area and a second pixel area, wherein pixels of a first resolution that are connected to a first cathode electrode are arranged in the first pixel area, and pixels of a second resolution that are connected to a second cathode electrode are arranged in the second pixel area;
a power supply configured to apply a pixel driving voltage, a first low-potential supply voltage and a second low-potential supply voltage to the plurality of pixels; and
a timing controller configured to adjust the second low-potential supply voltage to the second cathode electrode when a maximum grayscale represented by pixel data to be applied to the plurality of pixels of the second resolution is equal to or less than a predetermined threshold,
wherein the first low-potential supply voltage is applied to the first cathode electrode in the first pixel area, and the second low-potential supply voltage is applied to the second cathode electrode in the second pixel area, and
wherein adjusting the second low-potential supply voltage by the timing controller includes:
calculating a voltage variation of the second low-potential supply voltage according to a difference between the maximum grayscale and the predetermined threshold,
calculating an amount of change in the second low-potential supply voltage based on the calculated voltage variation and a predetermined number of frame periods, and
adjusting the second low-potential supply voltage by the calculated amount of change in each of the predetermined number of frame periods, the predetermined number of frame periods being equal to or greater than two.