US 8,618,559 B2Granted

Organic electroluminescent display

AssigneeCanon Kabushiki Kaisha

InventorsAtsushi Hamaguchi, Nobutaka Mizuno

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Abstract

An organic electroluminescent (EL) display includes a plurality of organic EL devices for red, green, and blue subpixels, each including a first electrode on a light output side, a second electrode opposite the first electrode, and an organic compound layer including a light-emitting layer therebetween. The organic EL devices have a resonator structure between a first reflective surface closer to the first electrode than the organic compound layer and a second reflective surface closer to the second electrode than the organic compound layer. A predetermined white color is displayed by mixing the three colors such that an optical distance of the organic EL devices of each color between an emission position in the light-emitting layer and the second reflective surface is set within ±10% from an optical distance corresponding to an nth-order minimum of a curve of required current density against at least the optical distance.

Claims7

Dependent claims

An organic electroluminescent display comprising:

an organic EL element emitting light of red color, an organic EL element emitting light of green color and an organic EL element emitting light of blue color,
wherein each of the organic EL elements includes a first electrode on a light output side, a second electrode opposite the first electrode, and an organic compound layer including a light-emitting layer between the first electrode and the second electrode,
wherein each of the organic EL elements has a resonator structure configured to resonate light emitted from the light-emitting layer between a first reflective surface closer to the first electrode than the organic compound layer and a second reflective surface closer to the second electrode than the organic compound layer, and
wherein an optical distance of the organic EL elements of each color between an emission position in the light-emitting layer and the second reflective surface is set within ±10% from an optical distance corresponding to an nth-order minimum of a curve of required current density, which is necessary when a predetermined white color is displayed by the organic EL element emitting light of red color, the organic EL element emitting light of green color and the organic EL element emitting light of blue color, against the optical distance.

1 more element

An organic electroluminescent display comprising:

an organic EL element emitting light of red color, an organic EL element emitting light of green color and an organic EL element emitting light of blue color,
wherein each of the organic EL elements includes a first electrode on a light output side, a second electrode opposite the first electrode, and an organic compound layer including a light-emitting layer between the first electrode and the second electrode,
wherein each of the organic EL elements has a resonator structure configured to resonate light emitted from the light-emitting layer between a first reflective surface closer to the first electrode than the organic compound layer and a second reflective surface closer to the second electrode than the organic compound layer, and
wherein an optical distance of at least one of the organic EL elements between an emission position in the light-emitting layer and the second reflective surface is set within ±10% from an optical distance corresponding to an nth-order minimum of a curve of required current density, which is necessary when a predetermined white color is displayed by the organic EL element emitting light of red color, the organic EL element emitting light of green color and the organic EL element emitting light of blue color, against the optical distance.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 13/185,717Filed 19 Jul 2011
Priority: JP 2010-16379021 Jul 2010
Published: US 2012/0018712 A126 Jan 2012
Granted: 31 Dec 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H10K 59/876
Arrangements for extracting light from the devices: comprising a resonant cavity structure, e.g. Bragg reflector pair
H10K 59/353
Comprising red-green-blue [RGB] subpixels: characterised by the geometrical arrangement of the RGB subpixels
H10K 59/80518
Anodes: reflective anodes, e.g. ITO combined with thick metallic layers
H10K 50/14
OLEDs or polymer light-emitting diodes [PLED]: carrier transporting layers