Patent ID: 11917882
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Organic fine chemistry (Chemistry)
Classification: CPC H  C  Y | IPC C  H

Claim 2:
3. A light-emitting device with a bottom emission structure, comprising:
a plurality of pixels, one of the plurality of pixels comprising;
a transistor over a substrate, the transistor comprising:
an oxide semiconductor layer over a first insulating layer;
a gate electrode over the oxide semiconductor layer;
a source electrode and a drain electrode electrically connected to the oxide semiconductor layer; and
a second insulating layer over the oxide semiconductor layer, the source electrode, and the drain electrode;

an anode over the transistor;
a first EL layer configured to emit one of blue light and yellow light;
a second EL layer configured to emit the other one of blue light and yellow light; and
a charge-generation layer between the first EL layer and the second EL layer,

wherein:
a first light-emitting element comprising the first EL layer, the charge-generation layer, and the second EL layer is configured to emit light through a first coloring layer so that blue light is extracted to an outside of the light-emitting device,
a second light-emitting element comprising the first EL layer, the charge-generation layer, and the second EL layer is configured to emit light through a second coloring layer so that green light is extracted to an outside of the light-emitting device,
a third light-emitting element comprising the first EL layer, the charge-generation layer, and the second EL layer is configured to emit light through a third coloring layer so that red light is extracted to an outside of the light-emitting device,
a fourth light-emitting element comprising the first EL layer, the charge-generation layer, and the second EL layer is configured to emit light to the outside of the light-emitting device,
the light emitted to the outside of the light-emitting device by the fourth light-emitting element is obtained by combining the one of blue light and yellow light emitted from the first EL layer and the other one of blue light and yellow light emitted from the second EL layer,
one of the source electrode and the drain electrode is electrically connected to the anode, and
the anode is configured to function as a first electrode of one of the first to fourth light-emitting elements.