US 2011/0297977 A1Published application

Display device

AssigneeCanon Kabushiki Kaisha

InventorNorifumi Kajimoto

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Abstract

A display device includes a first organic electroluminescent element and a second organic electroluminescent element. The first and second organic electroluminescent elements have different luminescent colors. The first and second organic electroluminescent elements each include, in series, a first electrode, a first charge transport layer, a second charge transport layer, a light-emitting layer, and a second electrode. The first charge transport layer is common to the first and second organic electroluminescent elements. The second charge transport layer of the first organic electroluminescent element is different in thickness from the second charge transport layer of the second organic electroluminescent element. The concentration of a dopant material contained in the first charge transport layer is less than that of the second charge transport layer.

Claims12

Dependent claims

A display device comprising:

a first organic electroluminescent element;
and
a second organic electroluminescent element emitting a color different from a color emitted by the first organic electroluminescent element,
wherein the first and second organic electroluminescent elements each include, in series, a first electrode, a first charge transport layer containing a charge-transporting material and a dopant material, a second charge transport layer containing a charge-transporting material and a dopant material, a light-emitting layer, and a second electrode;
the first charge transport layer is common to the first and second organic electroluminescent elements and has a uniform thickness;
the second charge transport layer of the first organic electroluminescent element is different in thickness from the second charge transport layer of the second organic electroluminescent element;
and
the concentration of the dopant material in the first charge transport layer is less than the concentration of the dopant material in the second charge transport layer.

5 more elements

A display device comprising:

a first organic electroluminescent element;
and
a second organic electroluminescent element emitting a color different from a color emitted by the first organic electroluminescent element,
wherein the first and second organic electroluminescent elements each include, in series, a first electrode, a first charge transport layer containing a charge-transporting material and no dopant material, a second charge transport layer containing a charge-transporting material and a dopant material, a light-emitting layer, and a second electrode;
the first charge transport layer is common to the first and second organic electroluminescent elements and has a uniform thickness;
and the second charge transport layer of the first organic electroluminescent element is different in thickness from the second charge transport layer of the second organic electroluminescent element.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/149,571Filed 31 May 2011
Priority: JP 2010-1278673 Jun 2010
Published: 8 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H10K 59/30
Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00: devices…
H10K 50/155
Hole transporting layers: comprising dopants
H10K 50/165
Electron transporting layers: comprising dopants
H10K 85/324
Metal complexes comprising a group IIIA element, e.g. Tris gallium [Gaq3]: comprising aluminium, e.g. Alq3