Display apparatus having low specular reflection and improved contrast ratio
A display apparatus includes: a light-emitting device layer including a first light-emitting device; a light control layer arranged on the light-emitting device layer and including a first light control unit; and an optical functional layer arranged on the light control layer and configured to reduce near-infrared transmittance, wherein the first light-emitting device is configured to emit first-color light of a near-infrared region and the light control layer is configured to emit second-color light of a visible region.
1 . A display apparatus comprising:
a light-emitting device layer comprising a first light-emitting device within the light-emitting device layer;
a light control layer comprising a first light control unit on the light-emitting device layer; and
an optical functional layer on the light control layer and configured to reduce near-infrared transmittance,
wherein the first light-emitting device is configured to emit a first-color light in a near-infrared region, and
the light control layer is configured to emit a second-color light in a visible region.
2 . The display apparatus of claim 1 , wherein the optical functional layer has a transmittance of light at 780 nm of less than or equal to about 5%.
3 . The display apparatus of claim 1 , wherein the optical functional layer has a reflectance of light at 550 nm of less than or equal to about 5%.
4 . The display apparatus of claim 1 , wherein the light control layer comprises a multiphoton absorbent material, and the multiphoton absorbent material is configured to absorb and excite the first-color light to emit the second-color light.
5 . The display apparatus of claim 4 , wherein the multiphoton absorbent material comprises an organic material, an inorganic material, or one or more combinations thereof.
6 . The display apparatus of claim 4 , wherein the multiphoton absorbent material comprises a carbon-carbon double bond.
7 . The display apparatus of claim 4 , wherein the multiphoton absorbent material comprises a quantum dot and/or a nanoparticle.
8 . The display apparatus of claim 1 , wherein the first-color light has a maximum emission wavelength of greater than or equal to about 780 nm and less than or equal to about 1,000 nm.
9 . The display apparatus of claim 1 , wherein the second-color light has a maximum emission wavelength of greater than or equal to about 400 nm and less than or equal to about 700 nm.
10 . The display apparatus of claim 1 , wherein the second-color light has a maximum emission wavelength of greater than or equal to about 500 nm and less than or equal to about 600 nm.
11 . The display apparatus of claim 1 , wherein the first light-emitting device comprises:
a first electrode;
a second electrode facing the first electrode; and
an interlayer arranged between the first electrode and the second electrode and comprising a first emission layer, and
the first emission layer is configured to emit the first-color light.
12 . The display apparatus of claim 1 , wherein a reflectance (SCE) of the display apparatus is less than about 0.60%.
13 . The display apparatus of claim 1 , wherein the light control layer comprises a first light control unit corresponding to a first emission area, a second light control unit corresponding to a second emission area, and a third light control unit corresponding to a third emission area, and the first light control unit is configured to emit the second-color light.
14 . The display apparatus of claim 13 , wherein the first light control unit, the second light control unit, and the third light control unit are spaced apart from each other on the light control layer.
15 . The display apparatus of claim 13 , wherein
the first light control unit is configured to emit green light that has a maximum emission wavelength of greater than or equal to about 500 nm and less than or equal to about 600 nm,
the second light control unit is configured to emit blue light that has a maximum emission wavelength of greater than or equal to about 400 nm and less than or equal to about 500 nm, and
the third light control unit is configured to emit red light that has a maximum emission wavelength of greater than or equal to about 600 nm and less than or equal to about 700 nm.
16 . The display apparatus of claim 13 , wherein
the first light control unit comprises a first multiphoton absorbent material that is configured to absorb and excite the first-color light to emit green light having a maximum emission wavelength of greater than or equal to about 500 nm and less than or equal to about 600 nm,
the second light control unit comprises a second multiphoton absorbent material that is configured to absorb and excite the first-color light to emit blue light having a maximum emission wavelength of greater than or equal to about 400 nm and less than or equal to about 500 nm, and
the third light control unit comprises a third multiphoton absorbent material that is configured to absorb and excite the first-color light to emit red light having a maximum emission wavelength of greater than or equal to about 600 nm and less than or equal to about 700 nm.
17 . The display apparatus of claim 13 , wherein the light-emitting device layer further comprises a second light-emitting device corresponding to the second emission area and a third light-emitting device corresponding to the third emission area, and the first light-emitting device corresponds to the first emission area.
18 . The display apparatus of claim 17 , wherein the second light-emitting device is configured to emit third-color light in a visible region or a near-infrared region, and the third light-emitting device is configured to emit fourth-color light in a visible region or a near-infrared region.
19 . The display apparatus of claim 13 , wherein the second light control unit and the third light control unit each independently comprise a scatterer, a color conversion material, and/or a multiphoton absorbent material.
20 . The display apparatus of claim 19 , wherein the color conversion material comprises a quantum dot.