US 12,264,963 B2
Detection device
Kazuki Matsunaga, Tokyo (JP); Akio Takimoto, Tokyo (JP); and Shigesumi Araki, Tokyo (JP)
Assigned to Japan Display Inc., Tokyo (JP)
Filed by Japan Display Inc., Tokyo (JP)
Filed on May 9, 2024, as Appl. No. 18/659,181.
Application 18/659,181 is a continuation of application No. PCT/JP2022/041609, filed on Nov. 8, 2022.
Claims priority of application No. 2021-185099 (JP), filed on Nov. 12, 2021.
Prior Publication US 2024/0288303 A1, Aug. 29, 2024
Int. Cl. G01J 1/04 (2006.01); G01J 1/42 (2006.01)
CPC G01J 1/0407 (2013.01) [G01J 1/42 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A detection device comprising:
a plurality of photodiodes arranged on a substrate;
a front light comprising a light guide plate disposed so as to overlap the photodiodes and a light source configured to emit light to a side surface of the light guide plate; and
an optical filter layer provided between the photodiodes and the light guide plate of the front light, wherein
the optical filter layer comprises:
a plurality of light guide paths arranged as an array of individual and separate light guide paths, and the light guide paths each respectively at least partially overlap the photodiodes, and
a light-blocking portion having higher absorptance of the light than the light guide paths, the light-blocking portion being disposed between the light guide paths, and the detection device comprises a reflective layer that is provided between the light guide plate and the optical filter layer and overlaps the light-blocking portion of the optical filter layer.