Display unit, display module, and electronic device

A display unit comprising:

• a light-receiving device comprising:
• a first pixel electrode;
• an active layer over the first pixel electrode;
• and
• a common electrode over the active layer;
• a light-emitting device comprising:
• a second pixel electrode;
• a light-emitting layer over the second pixel electrode;
• an electron-transport layer over the light-emitting layer;
• and
• the common electrode over the electron-transport layer;
• a light-blocking layer over the common electrode;
• a resin layer over the light-blocking layer;
• and
• a substrate over the resin layer,
• wherein a first part of the light-blocking layer and a part of the resin layer overlap each other,
• wherein a second part of the light-blocking layer and the resin layer do not overlap each other,
• wherein a shortest distance between the common electrode and the first part of the light-blocking layer is smaller than a shortest distance between the common electrode and the second part of the light-blocking layer,
• wherein the electron-transport layer comprises a first region and a second region,
• wherein each of the first region and the second region comprises an electron-transport material and a first substance,
• wherein the first region has a different concentration of the first substance from the second region, and
• wherein the first substance is one of a metal, a metallic salt, a metal oxide and an organometallic complex.