US 11,726,361 B2
In-cell touch panel
Kosuke Nagata, Kameyama (JP); Kazutoshi Kida, Kameyama (JP); and Daiji Kitagawa, Kameyama (JP)
Assigned to SHARP DISPLAY TECHNOLOGY CORPORATION, Kameyama (JP)
Filed by Sharp Display Technology Corporation, Kameyama (JP)
Filed on Aug. 12, 2022, as Appl. No. 17/886,521.
Claims priority of application No. 2021-133885 (JP), filed on Aug. 19, 2021; and application No. 2022-070434 (JP), filed on Apr. 21, 2022.
Prior Publication US 2023/0060098 A1, Feb. 23, 2023
Int. Cl. G02F 1/1333 (2006.01); G06F 3/044 (2006.01); G06F 3/041 (2006.01)
CPC G02F 1/13338 (2013.01) [G06F 3/0444 (2019.05); G06F 3/0446 (2019.05); G06F 3/04164 (2019.05)] 8 Claims
OG exemplary drawing
 
1. An in-cell touch panel comprising:
a touch sensor substrate;
a pixel electrode formed on the touch sensor substrate;
a touch sensor electrode formed on the touch sensor substrate;
a counter substrate arranged to be opposed to the touch sensor substrate;
a counter substrate electrode formed on the counter substrate, the counter substrate electrode being not used in touch detection;
a liquid crystal layer arranged between the touch sensor substrate and the counter substrate;
a driving control circuit that supplies a driving signal to the touch sensor electrode;
a display control circuit that supplies a display signal to the pixel electrode;
a mode switching control circuit that switches, in a time-division manner, an operation mode of the in-cell touch panel between a display mode in which the display signal is supplied by the display control circuit to the pixel electrode, and a touch detection mode in which the driving signal is supplied by the driving control circuit to the touch sensor electrode; and
a counter substrate electrode control circuit that supplies the counter substrate electrode with a signal that is in synchronization with the driving signal and that has the same polarity as that of the driving signal in a period while the in-cell touch panel is in the touch detection mode, or causes the potential of the counter substrate electrode to be in a floating state in a period while the in-cell touch panel is in the touch detection mode.