Fingerprint sensor and display device including the same

A fingerprint sensor comprising:

• a base substrate including a first sensing region and a second sensing region;
• a plurality of first photo sensors disposed on the first sensing region;
• a plurality of second photo sensors disposed on the second sensing region,
• wherein the first sensing region has an area larger than that of the second sensing region,
• wherein the plurality of second photo sensors have an arrangement density higher than that of the plurality of first photo sensors,
• wherein each of the plurality of first photo sensors has a first size, and each of the plurality of second photo sensors has a second size smaller than the first size,
• wherein the second photo sensors are used for registering a user's fingerprint, and
• wherein the first photo sensors and the second photo sensors are configured to detect the user's fingerprint using light reflected from the user's finger;
• and
• a horizontal fingerprint detector disposed in the second sensing region adjacent to a short side of the base substrate,
• wherein the first sensing region has a first height measured along a long side of the base substrate and a first width measured along a short side of the base substrate, and
• wherein the second sensing region has a second height measured along the long side of the base substrate and a second width measured along the short side of the base substrate, the second width smaller than the first width.