Patent ID: 11943985
Assignee: LG DISPLAY CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 0:
1. A light-emitting display device comprising:
a substrate having a plurality of subpixels;
an anode at each of the plurality of subpixels;
a cathode over the plurality of subpixels;
a charge generation layer between the anode and the cathode;
a first stack between the anode and the charge generation layer; and
a second stack between the charge generation layer and the cathode, the second stack overlapping the first stack,
wherein at least one subpixel of the plurality of subpixels comprises a first emissive layer having a first host and a first fluorescent dopant in the first stack, and a second emissive layer having a second host and a second fluorescent dopant in the second stack,
the second emissive layer configured to emit a same color-based light as the first emissive laver,
wherein the second emissive layer overlaps the first emissive layer and further includes a non-fluorescent dopant than that of the first emissive layer,
wherein the non-fluorescent dopant in the second emissive layer has an emission peak of a longer wavelength by approximately 1 nm or more to approximately 30 nm or less than an emission peak of the first fluorescent dopant in the first emissive layer, and
wherein the second host has a photoluminescence (PL) spectrum that overlaps a PL spectrum of the second fluorescent dopant, and the second host has a higher triplet state than that of the non-fluorescent dopant.