Fingerprint sensor and display device

A fingerprint sensor in a display device, the fingerprint sensor comprising:

• a plurality of photosensors arranged in a matrix,
• wherein each of the photosensors comprises:
• a semiconductor film configured to convert incident light into an electrical signal, and
• a light shielding film
• that is disposed on a lower layer side than the semiconductor film, and
• configured to block incidence of light to the semiconductor film from the lower layer side,
• wherein the light shielding film has four corner portions in outer contour shape in a top view, and
• wherein each of the four corner portions has a radius of curvature that exceeds a radius of curvature that occurs at corner portions of the light shielding film due to a forming process, the forming process including a photolithography process to shorten a circumferential length, which suppresses diffraction of light from the lower layer side.

A fingerprint sensor in a display device, the fingerprint sensor comprising:

• a plurality of photosensors arranged in a matrix,
• wherein each of the photosensors comprises:
• a semiconductor film configured to convert incident light into an electrical signal;
• and
• a light shielding film
• that is disposed on a lower layer side than the semiconductor film, and
• configured to block incidence of light from the lower layer side to the semiconductor film, and
• wherein an outer contour shape of the light-shielding film in a top view is entirely formed by curves to shorten a circumferential length, which suppresses diffraction of light from the lower layer side.