Display device including light emitting element
Disclosed is a display device including a substrate at an exit side, first to third color subpixels provided on the substrate, each of the color subpixels having a thin film transistor, first to third color filters provided respectively at the first to third color subpixels, first to third anodes provided respectively on the first to third color filters so as to be connected to the thin film transistors, an emission unit commonly provided at the first to third color subpixels on the first to third anodes, the emission unit including at least two blue fluorescent stacks and two phosphorescent stacks, and a cathode provided on the emission unit, wherein the first to third color subpixels constitute a basic unit, and a third color subpixel of an n-th basic unit neighbors a first color subpixel of an (n+1)-th basic unit in the same row or column on the substrate.
1 . A display device comprising:
a substrate;
first, second and third color subpixels on the substrate, each of the first, second and third color subpixels having a thin film transistor;
first, second and third color filters provided respectively at the first, second and third color subpixels;
first, second and third anodes provided respectively on the first, second and third color filters to be connected to the thin film transistors;
an emission unit commonly provided at the first, second and third color subpixels on the first, second and third anodes, the emission unit comprising at least two blue fluorescent stacks, a red phosphorescent stack and a green phosphorescent stack; and
a cathode on the emission unit, wherein
the first, second and third color subpixels constitute a basic unit,
a plurality of basic units is repeated in a plan view, and
a third color subpixel of an n-th basic unit neighbors a first color subpixel of an (n+1)-th basic unit in an identical row or an identical column on the substrate,
wherein each of the at least two blue fluorescent stacks comprises a blue fluorescent emission layer, the red phosphorescent stack includes a red phosphorescent emission layer and the green phosphorescent stack includes a green phosphorescent emission layer, and
wherein the blue fluorescent emission layer of each of the at least two blue fluorescent stacks, the red phosphorescent emission layer, and the green phosphorescent emission layer overlap with each other over the first, second, and the third subpixels and are vertically spaced apart from each other.
2 . The display device according to claim 1 , wherein
In the emission unit, the red phosphorescent stack, a first charge generation layer, a first blue fluorescent stack, a second charge generation layer, the green phosphorescent stack, a third charge generation layer, and a second blue fluorescent stack are sequentially disposed from the first, second and third anodes in a direction toward the cathode,
each of the red phosphorescent stack, the first blue fluorescent stack, the green phosphorescent stack, and the second blue fluorescent stack further comprises a first common layer under at least one emission layer, and a second common layer on at least one emission layer over the first, second and third color subpixels.
3 . The display device according to claim 1 , wherein
in the emission unit, the red phosphorescent stack, a first charge generation layer, a first blue fluorescent stack, a second charge generation layer, the green phosphorescent stack, a third charge generation layer, and a second blue fluorescent stack are sequentially disposed from the first, second and third anodes in a direction toward the cathode, and
the red phosphorescent stack further comprises a first blue fluorescent emission layer in contact with the red phosphorescent emission layer.
4 . The display device according to claim 1 , wherein the thin film transistor comprises at least one metal layer and an oxide semiconductor layer.
5 . The display device according to claim 4 , wherein the metal layer comprises a stack of a molybdenum oxide (MoOx) film and a copper film.
6 . The display device according to claim 1 , wherein a rear of the substrate is exposed to air.
7 . The display device according to claim 1 , further comprising:
an overcoat layer between the first, second and third color filters and the first, second and third anodes, wherein
the overcoat layer is provided at a surface thereof abutting the first, second and third anodes with an irregular pattern.
8 . The display device according to claim 7 , wherein the first, second and third anodes, the emission unit, and the cathode are disposed along the irregular pattern of the overcoat layer.
9 . The display device according to claim 1 , wherein light from the emission unit is transmitted through the first, second and third anode, the first, second and third color filters, and the substrate, and luminance of passed light through the substrate is increased at a color temperature lowered from 10,000 K to 6,500 K.
10 . A display device, comprising:
a first color subpixel disposed on a substrate, the first color subpixel including a first color filter and a first anode;
a second color subpixel disposed on the substrate, the second color subpixel including a second color filter and a second anode;
a third color subpixel disposed on the substrate, the third color subpixel including a third color filter and a third anode; and
an emission unit including at least two blue fluorescent stacks, a red phosphorescent stack and a green phosphorescent stack, the emission structure disposed on the first anode, the second anode and the third anode; and
a cathode disposed on the emission structure,
wherein each of the at least two blue fluorescent stacks comprises a blue fluorescent emission layer, the red phosphorescent stack includes a red phosphorescent emission layer and the green phosphorescent stack includes a green phosphorescent emission layer, and
wherein the blue fluorescent emission layer of each of the at least two blue fluorescent stacks, the red phosphorescent emission layer and the green phosphorescent emission layer overlap with each other over the first, second, and the third subpixels and are vertically spaced apart from each other.
11 . The display device of claim 10 , wherein:
the red phosphorescent stack, a first charge generation layer, a first blue fluorescent stack, a second charge generation layer, the green phosphorescent stack, a third charge generation layer, and a second blue fluorescent stack are sequentially disposed from the first, second and third anodes in a direction toward the cathode.
12 . The display device of claim 10 , wherein:
the red phosphorescent stack further comprises a first blue fluorescent emission layer in contact with the red phosphorescent emission layer.
13 . The display device of claim 10 , further comprising:
a hole transport common layer under each of the blue fluorescent emission layer of each of the at least two blue fluorescent stacks, the red phosphorescent emission layer and the green phosphorescent emission layer; and
an electron transport common layer above each of the blue fluorescent emission layer of the at least two blue fluorescent stacks, the red phosphorescent emission layer and the green phosphorescent emission layer.
14 . The display device of claim 10 , wherein:
among emission layers in the emission unit, the red phosphorescent layer is closest to the first, second and the third anodes.
15 . The display device of claim 10 , wherein:
the first color subpixel, the second color subpixel and the third color subpixel includes an oxide thin film transistor comprising at least one oxide semiconductor layer and at least one metal layer, and
the at least one metal layer comprises a stack of a molybdenum oxide (MoOx) film and a copper film is connected to first, second and third anodes.
16 . The display device of claim 10 , further comprising at least one thin film transistor overlapping adjacent two color filters among the first, second and third color filters.
17 . The display device of claim 16 ,
wherein the at least one thin film transistor comprises an electrode connected to first, second and third anodes, and
wherein the electrode of the at least one thin film transistor comprises a stack of a molybdenum oxide (MoOx) film and a copper film.
18 . The display device of claim 16 , further comprising:
a passivation film between at least one thin film transistor and the first, second and third color filters, and
an overcoat layer between the first, second and third color filter and the first, second and third anodes.
19 . The display device according to claim 18 ,
wherein the overcoat layer is provided at a surface thereof abutting the first, second and third anodes with an irregular pattern,
wherein the first, second and third anodes, the emission unit, and the cathode are disposed along the irregular pattern of the overcoat layer.
20 . The display device according to claim 10 ,
wherein a light from the emission unit is transmitted through the first, second and third anodes, the first, second and third color filters, and the substrate, and
wherein a luminance of passed light through the substrate is increased at a color temperature lowered from 10,000 K to 6,500 K.