US 12,315,286 B2
Detection device
Shigesumi Araki, Tokyo (JP); Kazuki Matsunaga, Tokyo (JP); and Akio Takimoto, Tokyo (JP)
Assigned to Japan Display Inc., Tokyo (JP)
Filed by Japan Display Inc., Tokyo (JP)
Filed on May 9, 2024, as Appl. No. 18/659,213.
Application 18/659,213 is a continuation of application No. PCT/JP2022/042116, filed on Nov. 11, 2022.
Claims priority of application No. 2021-185214 (JP), filed on Nov. 12, 2021.
Prior Publication US 2024/0290134 A1, Aug. 29, 2024
Int. Cl. G06V 40/12 (2022.01); G06V 40/13 (2022.01); H10F 39/00 (2025.01); H10F 39/12 (2025.01)
CPC G06V 40/1318 (2022.01) [H10F 39/198 (2025.01); H10F 39/806 (2025.01)] 11 Claims
OG exemplary drawing
 
1. A detection device comprising:
a photosensor comprising a plurality of light-receiving elements configured to receive light;
a front light that is disposed on a side of an object to be detected with respect to the photosensor and comprises a light guide plate and a light source configured to emit light to a first side surface of the light guide plate; and
an optical filter layer that is provided between the light-receiving elements and the front light, wherein
the optical filter layer comprises light guide paths that at least partially overlap the light-receiving elements and a light-blocking portion that has higher absorptance of the light than the light guide paths,
when viewed from a detection surface of the light guide plate facing the object to be detected, a first opening of each of the light guide paths closest to the light-receiving elements is offset in a direction more away from the light source than a second opening of the light guide path farthest from the light-receiving elements,
the light guide plate comprises a scattering portion configured to scatter the light from the light source on the optical filter layer side, and
when viewed in a normal direction to the detection surface of the light guide plate, a first peak of an intensity of first light emitted from the detection surface of the light guide plate is observed to be tilted toward a side opposite to the first side surface.