Display device including photosensor units

A display device, comprising:

• a substrate comprising a display region comprising a plurality of pixels and a sensing region provided in at least one region of the display region;
• a circuit element layer disposed on a first surface of the substrate, the circuit element layer comprising a plurality of conductive layers;
• a light emitting element layer provided on the circuit element layer, the light emitting element layer comprising a plurality of light emitting elements;
• a plurality of pin holes disposed in the circuit element layer and/or a light blocking layer disposed between the circuit element layer and the substrate;
• and
• a sensor layer disposed on a second surface of the substrate opposite to the first surface, wherein the sensor layer comprises a plurality of photo sensor units,
• wherein each of the photo sensor units comprises a plurality of sensor pixels,
• wherein at least one among the photo sensor units, the sensor pixels, and the pin holes are arranged in the sensing region,
• wherein the photo sensor units at least partially overlap the pixels in a thickness direction and are configured to use at least some of the plurality of pixels disposed in the sensing region as a light source,
• wherein the plurality of sensor pixels included in each of the photo sensor units are spaced apart from each other by a same pitch,
• wherein the plurality of photo sensor units are disposed in a two-dimensional array comprising a plurality of rows and a plurality of columns, and
• wherein, at least one of the photo sensor units of the plurality of photo sensor units is not aligned in a column direction with any other photo sensor unit of the plurality of photo sensor units disposed m a most adjacent row.