Organic light emitting diode display

1. An organic light emitting diode display, comprising:

a display panel comprising:

a substrate;

a plurality of organic light emitting elements which is on the substrate and generates light; and

an encapsulation substrate configured to seal the organic light emitting elements and through which the light is emitted from the display panel;

an optical unit on the display panel and facing a surface of the encapsulation substrate through which the light is emitted from the display panel, the optical unit comprising a metal material film and a dielectric material film each of which extends to overlap an entirety of the encapsulation substrate to define transmittance of the optical unit about 43% or higher and

a window on the optical unit,

wherein

the metal material film and the dielectric material film are provided in plural and are alternately stacked, and

the optical unit further comprises:

a first metal material film on the encapsulation substrate,

a first dielectric material film on the first metal material film,

a second metal material film on the first dielectric material film, and

a second dielectric material film on the second metal material film,

wherein among all the metal material films of the optical unit,

the first metal material film is closest to the display panel and the second metal material film is furthest from the display panel, and

a metal of the second metal material film furthest from the display panel has lower reflectance and a higher absorption rate than those of a metal of the first metal material film closest to the display panel.

2. The organic light emitting diode display of claim 1 , wherein the metal material film has an optical absorption rate of about 40% or higher and a refractive index ranging from about 0.5 to about 7.

3. The organic light emitting diode display of claim 2 , wherein the metal material film comprises one of Al, Ag, Mg, Cr, Ti, Ni, Au, Ta, Cu, Ca, Co, Fe, Mo, W, Pt, Yb, NiS, a combination thereof, or an alloy thereof, or comprises one of a metal oxide and a metal nitride, and a combination thereof.

4. The organic light emitting diode display of claim 1 , wherein the dielectric material film comprises one of SiO 2 , TiO 2 , LiF, CaF 2 , MgF 2 , SiNx, Ta 2 O 5 , Nb 2 O 5 , SiCN, SiO x , TiO x , ZrO 2 , MgO, CaO, Y 2 O 3 , ThF 4 , YF 3 , Al x O y , SiO x N y , ZrO x F y , SiO x F y , AlO x N y , an acryl, a polymer acryl, a polyimide, a polycarbonate, polymethlymethacrylate, polystyrene, polyester, polyethylene, polyethylene terephthalate and a combination thereof.

5. The organic light emitting diode display of claim 1 , further comprising:

a touch panel between the optical unit and the encapsulation substrate.

6. An organic light emitting diode display, comprising:

disposed in order,

a substrate;

a plurality of organic light emitting elements on the substrate;

an encapsulation substrate configured to seal the organic light emitting elements; and

an optical unit comprising a metal material film and a dielectric material film, each of the metal material film and the dielectric film provided in plural and extended to overlap an entirety of the encapsulation substrate to define transmittance of the optical unit about 43% or higher,

wherein

an overall thickness of the optical unit comprising each of the metal material film and the dielectric film provided in plural and extended to overlap the entirety of the encapsulation substrate, is equal to or smaller than about 3 micrometers, and

in the overall thickness equal to or smaller than about 3 micrometers of the optical unit, a total thickness of the plural dielectric material films is equal to or smaller than about 2.5 micrometers,

wherein

the plural metal material film and the plural dielectric material film are alternately stacked, and

the optical unit further comprises:

a first metal material film on the encapsulation substrate,

a first dielectric material film on the first metal material film,

a second metal material film on the first dielectric material film, and

a second dielectric material film on the second metal material film,

wherein among all the metal material films of the optical unit,

the first metal material film is closest to the display panel and the second metal material film is furthest from the display panel, and

a metal of the second metal material film furthest from the display panel has lower reflectance and higher absorption rate than those of a metal of the first metal material film closest to the display panel.

7. The organic light emitting diode display of claim 6 , wherein the metal material film has an optical absorption rate of about 40% or higher and a refractive index ranging from about 0.5 to about 7.

8. The organic light emitting diode display of claim 7 , wherein the metal material film comprises one of Al, Ag, Mg, Cr, Ti, Ni, Au, Ta, Cu, Ca, Co, Fe, Mo, W, Pt, Yb, NiS and a combination thereof, or an alloy thereof, or comprises one of a metal oxide and a metal nitride, and a combination thereof.

9. The organic light emitting diode display of claim 6 , wherein the dielectric material film comprises one of SiO 2 , TiO 2 , LiF, CaF 2 , MgF 2 , SiN x , Ta 2 O 5 , Nb 2 O 5 , SiCN, SiO x , TiO x , ZrO 2 , MgO, CaO, Y 2 O 3 , ThF 4 , YF 3 , Al x O y , SiO x N y , ZrO x F y , SiO x F y , AlO x N y , an acryl, a polymer acryl, a polyimide, a polycarbonate, polymethlymethacrylate, polystyrene, polyester, polyethylene, and polyethylene terephthalate, and a combination thereof.

10. An organic light emitting diode display comprising:

a display panel comprising:

a substrate;

a plurality of organic light emitting elements which is on the substrate and generates light; and

an encapsulation substrate configured to seal the organic light emitting elements and through which the light is emitted from the display panel;

a touch panel on the display panel;

a window on the display panel; and

an optical unit on the display panel and facing a surface of the encapsulation substrate through which the light is emitted from the display panel, the optical unit comprising a metal material film and a dielectric material film each of which extends to overlap an entirety of the encapsulation substrate,

wherein

the optical unit comprising the metal material film and the dielectric material film each of which extends to overlap the entirety of the encapsulation substrate is disposed between the encapsulation substrate and the touch panel,

transmittance of the optical unit disposed between the encapsulation substrate and the touch panel is about 43% or higher,

the metal material film and the dielectric material film are provided in plural and are alternately stacked, and

the optical unit further comprises:

a first metal material film on the encapsulation substrate,

a first dielectric material film on the first metal material film,

a second metal material film on the first dielectric material film, and

a second dielectric material film on the second metal material film,

wherein among all the metal material films of the optical unit,

the first metal material film is closest to the display panel and the second metal material film is furthest from the display panel, and

a metal of the second metal material film furthest from the display panel has lower reflectance and higher absorption rate than a metal of the first metal material film closest to the display panel.

11. The organic light emitting diode display of claim 1 , wherein the optical unit is contacted directly with the encapsulation substrate.