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US 12,108,618 B2Granted
White light emitting device with light emitting layers in a single contour region and display device using the same
AssigneeLG Display Co., Ltd.
InventorsMi Young Han, Min Hyeong Hwang, Jung Keun Kim
Life of this patent
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Abstract
A white light emitting device and a display device using the same which can prevent a change in luminance due to change in viewing angle, improve color deviation, and lower a driving voltage at the same time, through a change in an internal stack structure and a thickness an emission-side electrode with regard to a vertical distance from a lower surface of the first electrode to a lower surface of the second electrode.
Claims18
A white light emitting device comprising:
- a first stack disposed on a first electrode through which light is emitted and including a red light emitting layer and a green light emitting layer;
- a charge generation layer disposed on the first stack;
- a second stack disposed on the charge generation layer and including a blue light emitting layer;
- and
- a second electrode disposed on the second stack,
- wherein a thickness of the first electrode is 0.1 times or more and 0.26 times or less of a distance from a lower surface of the first electrode to a lower surface of the second electrode, and
- wherein the distance from the lower surface of the first electrode to the lower surface of the second electrode is 150 nm to 200 nm.
4 more elements
A display device comprising:
- a substrate including a plurality of sub-pixels;
- a thin-film transistor disposed at each of the sub-pixels;
- a first electrode connected to the thin-film transistor at each sub-pixel;
- a white organic stack disposed on the first electrode through which light is emitted from the white organic stack and comprising a first stack including a red light emitting layer and a green light emitting layer, a second stack including a blue light emitting layer and a charge generation layer disposed between the first stack and the second stack;
- and
- a second electrode disposed on the white organic stack,
- wherein a thickness of the first electrode is 0.1 times or more and 0.26 times or less of a total thickness of the first electrode and the white organic stack, and
- wherein the distance from the lower surface of the first electrode to the lower surface of the second electrode is 150 nm to 200 nm.
5 more elements
Dependencies are inferred from the claim text.