Patent ID: 11956980
Assignee: LG DISPLAY CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 20:
21. A display device comprising:
a substrate comprising a plurality of subpixels;
a thin film transistor provided in each of the plurality of subpixels; and
an organic light emitting device provided in each of the plurality of subpixels so as to be connected to the thin film transistor,
wherein the organic light emitting device comprises a first electrode and a second electrode arranged opposite each other, and a plurality of stacks provided between the first and second electrodes so as to be distinguished from each other by charge generation layers,
wherein the plurality of stacks comprise a plurality of light emitting layers, each of the plurality of light emitting layers having at least one host, a phosphorescent dopant and a fluorescent dopant for the same color emission at at least one of the plurality of subpixels and the plurality of light emitting layers are overlapped at the at least one of the plurality of subpixels,
wherein a light emission is concentrated upon the fluorescent dopant through energy transfers from the host and the phosphorescent dopant to the fluorescent dopant in the single layer,
wherein the phosphorescent dopant is configured to have a first triplet energy level; and
wherein the fluorescent dopant is configured to have a second triplet energy level lower than the first triplet energy level and to generate fluorescence and thermally activated delayed fluorescence (TADF).