US 12,223,763 B2
Detection device
Gen Koide, Tokyo (JP); Keiichi Saito, Tokyo (JP); and Takashi Nakamura, Tokyo (JP)
Assigned to Japan Display Inc., Tokyo (JP)
Filed by Japan Display Inc., Tokyo (JP)
Filed on Jul. 25, 2023, as Appl. No. 18/225,838.
Application 18/225,838 is a continuation of application No. PCT/JP2022/002906, filed on Jan. 26, 2022.
Claims priority of application No. 2021-010588 (JP), filed on Jan. 26, 2021.
Prior Publication US 2023/0368567 A1, Nov. 16, 2023
Int. Cl. G06V 40/13 (2022.01); G06V 10/147 (2022.01); G06V 40/10 (2022.01); G06V 40/145 (2022.01)
CPC G06V 40/1318 (2022.01) [G06V 10/147 (2022.01); G06V 40/145 (2022.01); G06V 40/15 (2022.01)] 23 Claims
OG exemplary drawing
 
1. A detection device comprising:
a plurality of optical sensors arranged in a matrix having a row-column configuration;
a first gate line drive circuit configured to supply a gate drive signal to the optical sensors arranged in a row direction;
a second gate line drive circuit configured to supply a refreshing signal to supply a forward bias potential to the optical sensors arranged in the row direction during a refreshing period in which a refreshing operation is performed;
a reset circuit configured to supply a reference potential to reverse-bias the optical sensors arranged in a column direction; and
a detection circuit configured to be supplied with a signal from each of the optical sensors arranged in the column direction,
wherein
each of the optical sensors is configured to be switchable alternately between a reverse-bias state and a forward-bias state, and
the detection device is configured to:
detect the signal that is output from each of the optical sensors by reverse-biasing the optical sensor,
perform the refreshing operation to restore characteristics of the optical sensor to an initial state by forward-biasing the optical sensor for each predetermined period, and
switch the optical sensor from the reverse-bias state to the forward-bias state at predetermined intervals to perform the refreshing operation.