DETECTION DEVICE
According to an aspect, a detection device includes: a sensor panel having a detection area in which optical sensors are two-dimensionally arranged; a light source configured to emit light; a member on which an object to be detected is to be placed such that the object to be detected is interposed between the detection area and the light source; and a control circuit configured to perform processing based on outputs of the optical sensors. The member has a light-transmitting area in which the object to be detected is to be placed and a light-blocking area provided around the light-transmitting area. The detection area is located so as to overlap both the light-transmitting area and the light-blocking area. The control circuit is configured to obtain a difference between the outputs of the optical sensors overlapping the light-transmitting area and the outputs of the optical sensors overlapping the light-blocking area.
1 . A detection device comprising:
a sensor panel that has a detection area in which a plurality of optical sensors are two-dimensionally arranged;
a light source configured to emit light;
a member on which an object to be detected is to be placed such that the object to be detected is interposed between the detection area and the light source; and
a control circuit configured to perform processing based on outputs of the optical sensors, wherein
the member has a light-transmitting area in which the object to be detected is to be placed and a light-blocking area provided around the light-transmitting area,
the detection area is located so as to overlap both the light-transmitting area and the light-blocking area, and
the control circuit is configured to obtain a difference between the outputs of the optical sensors overlapping the light-transmitting area and the outputs of the optical sensors overlapping the light-blocking area.
2 . The detection device according to claim 1 , wherein the optical sensors comprise photodiodes.
3 . The detection device according to claim 1 , wherein
the detection area comprises:
the optical sensors arranged in a matrix having a having a row-column configuration; and
a plurality of partial areas, and
the control circuit is configured to obtain, for each of the partial areas, the difference between the outputs of the optical sensors overlapping the light-transmitting area and the outputs of the optical sensors overlapping the light-blocking area.
4 . The detection device according to claim 1 , wherein
the detection area comprises the optical sensors arranged in a matrix having a row-column configuration, and
the control circuit is configured to obtain the difference between the outputs of the optical sensors overlapping the light-transmitting area and the outputs of the optical sensors overlapping the light-blocking area, for each row of the optical sensors.
5 . The detection device according to claim 1 , wherein the outputs of the optical sensors that overlap a boundary area between the light-transmitting area and the light-blocking area are not used to obtain the difference.