US 12,615,911 B2Granted

Electroluminescence display

AssigneeLG Display Co., Ltd.

InventorMyoungHo Lee

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Abstract

The present disclosure relates to an electroluminescence display having enhanced display quality by preventing external light from being reflected. An electroluminescence display according to the present disclosure comprises: a light shielding layer disposed on a substrate, and including a first metal layer and a second metal layer on the first metal layer; a first buffer layer covering the light shielding layer on the substrate; a gate line disposed on the first buffer layer and not overlapped with the light shielding layer, the gate line including a third metal layer and a fourth metal layer on the third metal layer; a passivation layer covering the gate line; a planarization layer on the passivation layer; and an emission element including a first electrode, an emission layer and a second electrode sequentially stacked on the planarization layer.

Claims20

Dependent claims

An electroluminescence display comprising:

a light shielding layer disposed on a substrate, the light shielding layer including a first metal layer and a second metal layer on the first metal layer;
a first buffer layer covering the light shielding layer on the substrate;
a gate line disposed on the first buffer layer and not overlapped with the light shielding layer, the gate line including a third metal layer and a fourth metal layer on the third metal layer;
a passivation layer covering the gate line;
a planarization layer on the passivation layer;
and
an emission element including a first electrode, an emission layer and a second electrode sequentially stacked on the planarization layer,
wherein the first metal layer and the third metal layer include a thickness in range of 100 Å to 500 Å,
wherein the second metal layer and the fourth metal layer include a thickness in range of 2,000 Å to 4,000 Å, and
wherein the second electrode includes:
a first cathode layer disposed on the emission layer, the first cathode layer having a first metal material with a thickness in range of 100 Å to 200 Å;
a second cathode layer disposed on the first cathode layer, the second cathode layer including a conductive resin material having a domain material and a dopant;
and
a third cathode layer disposed on the second cathode layer, the third cathode layer including a second metal material with a thickness in range of 2,000 Å to 4,000 Å.

11 more elements

An electroluminescent display, comprising:

a plurality of transistors disposed on a substrate;
a light emitting element electrically coupled to at least one of the transistors;
a light shielding layer including a first layer formed of a first material having a first refractive index and a first thickness, and a second layer formed of a second material having a second refractive index and a second thickness;
and
one or more signal lines electrically coupled to corresponding ones of the plurality of transistors, at least one of the signal lines including a third layer formed of a third material having a third refractive index and a third thickness and a fourth layer formed of a fourth material having a fourth refractive index and a fourth thickness,
wherein first light reflected from a first surface of the first layer and second light reflected from a first surface of the second layer contacting a second surface of the first layer being at least partially canceled out,
wherein third light reflected from a first surface of the third layer and fourth light reflected from a first surface of the fourth layer contacting a second surface of the third layer being at least partially canceled out,
wherein the light emitting element includes a first electrode, an emission layer and a second electrode sequentially stacked,
wherein the second electrode includes a first cathode layer disposed on the emission layer, a second cathode layer disposed on the first cathode layer, and a third cathode layer disposed on the second cathode layer, and
wherein fifth light reflected from a first surface of the first cathode layer and sixth light reflected from a first surface of the third cathode layer being at least partially canceled out.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/973,356Filed 25 Oct 2022
Priority: KR 10-2021-019285030 Dec 2021
Published: US 2023/0217700 A16 Jul 2023
Granted: 28 Apr 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H10K 50/865
Arrangements for improving contrast, e.g. preventing reflection of ambient light: comprising light absorbing layers, e.g. light-blocking layers
H10K 59/8791
Constructional details: arrangements for improving contrast, e.g. preventing reflection of ambient light
H10K 50/82
Electrodes: cathodes
H10K 50/858
Arrangements for extracting light from the devices: comprising refractive means, e.g. lenses