US 12,086,356 B2
Display device with touch panel and touch panel
Takuya Henmi, Kameyama (JP); Satoshi Sekido, Kameyama (JP); Keisuke Kanda, Kameyama (JP); and Yuhji Satoh, Kameyama (JP)
Assigned to Sharp Display Technology Corporation, Kameyama (JP)
Filed by Sharp Display Technology Corporation, Kameyama (JP)
Filed on Jan. 3, 2023, as Appl. No. 18/092,710.
Claims priority of application No. 2022-007471 (JP), filed on Jan. 20, 2022.
Prior Publication US 2023/0229257 A1, Jul. 20, 2023
Int. Cl. G06F 3/044 (2006.01); G06F 3/041 (2006.01)
CPC G06F 3/04166 (2019.05) [G06F 3/0443 (2019.05)] 9 Claims
OG exemplary drawing
 
1. A display device with a touch panel comprising:
a touch electrode configured to output a touch detection signal, a value of the touch detection signal changing depending on a presence or absence of a touch by a pointer;
a display disposed at a position overlapping the touch electrode in a plan view;
a reference touch electrode formed from the same material as a material of the touch electrode;
a reference electrode disposed facing the reference touch electrode, a predetermined constant potential being applied to the reference electrode;
a control circuit configured to determine the presence or absence of the touch by the pointer by comparing the value of the touch detection signal with a detection threshold value; and
a black matrix configured to block light from the display,
wherein the reference touch electrode outputs a reference signal based on a capacitance formed between the reference touch electrode and the reference electrode,
the control circuit is further configured to determine the detection threshold value to be a value equal to or less than a value of the reference signal,
the reference electrode is disposed at a position overlapping the black matrix in the plan view and overlapping the reference touch electrode in the plan view, and
the reference electrode is sandwiched between the black matrix and the reference touch electrode such that the reference electrode is positioned below the black matrix and above the reference touch electrode in the plan view.