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US 10,373,559 B2Granted
Organic light-emitting device and organic light-emitting display device using the same
AssigneeLG Display Co., Ltd.
InventorsSeok-Hyun Kim, Eun-Jung Park, Ho-Sung Kim
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Abstract
An organic light-emitting device and an organic light-emitting display device using the same are discussed. In a structure in which emission layers that emit light having the same color are provided in a plurality of stacks, the emission layers have different properties such that the light emission efficiencies of the stacks are made uniform, whereby the lifespan of the organic light-emitting device is increased through charge balance.
Claims13
An organic light-emitting device comprising:
- a first electrode and a second electrode provided opposite each other;
- a charge generation layer provided between the first electrode and the second electrode;
- a first stack provided between the first electrode and the charge generation layer, the first stack comprising a first hole transport layer, a first emission layer, and a first electron transport layer;
- and
- a second stack provided between the charge generation layer and the second electrode, the second stack comprising a second hole transport layer, a second emission layer, which emits a same color as the first emission layer, and a second electron transport layer,
- wherein a hole transport rate of the second emission layer is higher than a hole transport rate of the first emission layer so that an emission zone of the second emission layer is maintained without movement towards the charge generation layer over time.
3 more elements
An organic light-emitting display device comprising:
- a substrate having a plurality of sub-pixels;
- a thin film transistor provided at at least one of the sub-pixels on the substrate;
- and
- an organic light-emitting device connected to the thin film transistor,
- wherein the organic light-emitting device comprises:
- a first electrode and a second electrode opposite each other;
- a charge generation layer provided between the first electrode and the second electrode;
- a first stack provided between the first electrode and the charge generation layer, the first stack comprising a first hole transport layer, a first emission layer, and a first electron transport layer;
- and
- a second stack provided between the charge generation layer and the second electrode, the second stack comprising a second hole transport layer, a second emission layer, which emits a same color as the first emission layer, and a second electron transport layer, and
- wherein a hole transport rate of the second emission layer is higher than a hole transport rate of the first emission layer so that an emission zone of the second emission layer is maintained without movement towards the charge generation layer over time.
8 more elements
An organic light-emitting device comprising:
- a first electrode and a second electrode provided opposite each other;
- a charge generation layer provided between the first electrode and the second electrode;
- a first stack provided between the first electrode and the charge generation layer, the first stack comprising a first hole transport layer, a first emission layer, and a first electron transport layer;
- and
- a second stack provided between the charge generation layer and the second electrode, the second stack comprising a second hole transport layer, a second emission layer, which emits a same color as the first emission layer, and a second electron transport layer,
- wherein a hole transport rate of the second emission layer is higher than a hole transport rate of the first emission layer, and
- wherein an electron transport rate of the first emission layer is higher than an electron transport rate of the second emission layer.
4 more elements
Dependencies are inferred from the claim text.