US 11,656,724 B2
Display device, detection device and watch
Akihiko Fujisawa, Tokyo (JP); Kaoru Ito, Tokyo (JP); and Daichi Abe, Tokyo (JP)
Assigned to Japan Display Inc., Tokyo (JP)
Filed by Japan Display Inc., Tokyo (JP)
Filed on Aug. 19, 2021, as Appl. No. 17/406,397.
Claims priority of application No. JP2020-139300 (JP), filed on Aug. 20, 2020.
Prior Publication US 2022/0057872 A1, Feb. 24, 2022
Int. Cl. G06F 3/044 (2006.01); G06F 3/041 (2006.01); G04G 21/08 (2010.01); G02F 1/1333 (2006.01)
CPC G06F 3/044 (2013.01) [G02F 1/13338 (2013.01); G04G 21/08 (2013.01); G06F 3/0412 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A display device comprising:
a first substrate;
a second substrate opposing the first substrate;
a liquid crystal layer held between the first substrate and the second substrate;
at least one first detection electrode disposed in a display area which displays images;
a plurality of second detection electrodes disposed in a peripheral area surrounding the display area;
a drive circuit connected to the first detection electrode and supplying drive pulses to the first detection electrode;
a power management circuit including a power circuit and a first switch provided between the drive circuit and the power circuit; and
a second switch provided between the drive circuit and the first detection electrode,
during a display period in which images are displayed in the display area, a predetermined voltage for driving the liquid crystal layer being applied to the first detection electrode, and
in a period in which the liquid crystal layer is not driven, the first switch and the second switch are turned off and the first detection electrode is set to a state of being not electrically connected to anywhere or to a state of being connected to a predetermined potential with an impedance of 50 kΩ or higher.