DETECTION DEVICE
According to an aspect, a detection device includes: a light source device; an object placement member; an electrochromic shutter having a plurality of divided regions arranged in a plane; and an optical sensor having a plurality of detection regions arranged in a plane. One of the detection regions includes one or more photodetection elements. The divided regions in the electrochromic shutter are capable of being switched between a light-transmitting state and a non-light-transmitting state for each of the divided regions, and the light-emitting elements are each capable of being switched between a lit state and an unlit state. The respective light-emitting elements, the respective divided regions of the electrochromic shutter, and the respective detection regions overlap when viewed in the first direction.
1 . A detection device comprising:
a light source device comprising a plurality of light-emitting elements arranged in a plane;
an object placement member with a light-transmitting property that is disposed overlapping the light source device on a first side in a first direction and on which an object to be detected is placed;
an electrochromic shutter that is disposed overlapping the object placement member on the first side in the first direction and has a plurality of divided regions arranged in a plane; and
an optical sensor that is disposed overlapping the electrochromic shutter on the first side in the first direction and has a plurality of detection regions arranged in a plane, wherein
one of the detection regions includes one or more photodetection elements,
the divided regions in the electrochromic shutter are capable of being switched between a light-transmitting state and a non-light-transmitting state for each of the divided regions, and the light-emitting elements are each capable of being switched between a lit state and an unlit state, and
the respective light-emitting elements, the respective divided regions of the electrochromic shutter, and the respective detection regions overlap when viewed in the first direction.
2 . The detection device according to claim 1 , wherein a divided region overlapping a light-emitting element in a lit state when viewed in the first direction out of the divided regions is brought into the light-transmitting state, and a divided region overlapping the light-emitting element in an unlit state when viewed in the first direction is brought into a non-light-transmitting state.
3 . The detection device according to claim 2 , wherein
the light-emitting elements, the divided regions, and the detection regions are arranged in a matrix having a row-column configuration along a second direction intersecting the first direction and a third direction intersecting the first direction and the second direction, and
when N is a natural number,
the light-emitting elements arranged in an N-th row are sequentially brought into the lit state from a first end in the second direction to a second end, and the divided regions arranged in the N-th row are sequentially brought into the light-transmitting state from the first end in the second direction to the second end, and
after the lit state and the light-transmitting state in the N-th row are ended, the light-emitting elements arranged in an N+1-th row are brought into the lit state, and the divided regions arranged in the N+1-th row are brought into the light-transmitting state.
4 . The detection device according to claim 3 , wherein
the light-emitting elements include a first light-emitting element and a second light-emitting element adjacent to the first light-emitting element on the second end side in the second direction with respect to the first light-emitting element,
the divided regions include a first divided region overlapping the first light-emitting element when viewed in the first direction and a second divided region overlapping the second light-emitting element when viewed in the first direction, and
the first light-emitting element is brought into the unlit state and the first divided region is brought into the non-light-transmitting state before the second light-emitting element is brought into the lit state and the second divided region is brought into the light-transmitting state.
5 . The detection device according to claim 4 , wherein the transmittance of the first divided region is controlled to start to increase before the first light-emitting element is turned on.
6 . The detection device according to claim 4 , wherein the first light-emitting element is controlled to be in the lit state when the transmittance of the first divided region is equal to or higher than a predetermined value with respect to a maximum transmittance.
7 . The detection device according to claim 4 , wherein the transmittance of the first divided region is controlled to start to decrease after the first light-emitting element is brought into the unlit state.
8 . The detection device according to claim 6 , wherein the predetermined value is 95%.