Patent ID: 8686928

Claim:
A light emitting device comprising: a pixel comprising: a light emitting element comprising an EL layer, a photoelectric conversion element for detecting a brightness of the light emitting element, the photoelectric conversion element comprising a photoelectric conversion layer, a first electrode, and a second electrode; a first transistor for controlling the light emitting element, and a second transistor electrically connected to the photoelectric conversion element; a memory circuit for storing the detected brightness; and a correction circuit for correcting an image signal based on the stored brightness, wherein the light emitting element emits light based on the corrected image signal, wherein the first transistor and the second transistor are provided over a substrate, wherein a first insulating layer is provided over the first transistor and the second transistor, wherein the first electrode is provided over the first insulating layer, wherein the photoelectric conversion layer is provided over the first electrode, wherein the second electrode is provided over the photoelectric conversion layer, wherein a second insulating layer is provided over the second electrode, wherein the light emitting element is provided over the second insulating layer, and wherein the EL layer is overlapped with the photoelectric conversion layer with the second insulating layer provided therebetween.