Transparent conductor and optical display apparatus comprising the same

1. A transparent conductor comprising:

a base layer; and

a transparent conductive film directly on one or both sides of the base layer, the transparent conductive film comprising a metal nanowire,

wherein the base layer comprises a retardation film, and

wherein the base layer has a retardation value of an in-plane direction, Ro, of about 140 nanometers (nm) to about 280 nm at a wavelength of 550 nm, an Ro value of about 120 nm to about 140 nm at a wavelength of 450 nm, and an Ro value of about 130 nm to about 155 nm at a wavelength of 650 nm,

wherein Ro is defined by Formula 1:

Ro =( nx−ny )× d   Formula 1

wherein, in Formula 1, nx and ny are refractive indices in the x-axis and y-axis directions of the transparent conductor, respectively, and d is a thickness of the base layer in nm.

2. The transparent conductor according to claim 1 , wherein the transparent conductor has a ratio B/A of about 0.9 to about 1.1, B/A being a ratio of an Ro value B in nanometers (nm) at a wavelength of 450 nm to the Ro value A in nm at a wavelength of 550 nm.

3. The transparent conductor according to claim 1 , wherein the transparent conductor has a ratio C/A of about 0.9 to about 1.1, C/A being a ratio of an Ro value C in nanometers (nm) at a wavelength of 650 nm to the Ro value A in nm at a wavelength of 550 nm.

4. The transparent conductor according to claim 1 , wherein the transparent conductor has a thickness of about 10 μm to about 250 μm.

5. The transparent conductor according to claim 1 , wherein the transparent conductor has a λ/4 retardation or a λ/2 retardation.

6. The transparent conductor according to claim 1 , wherein the base layer is a λ/2 retardation film or a λ/4 retardation film.

7. The transparent conductor according to claim 1 , wherein the base layer comprises a polycarbonate, cyclic olefin, polyester, non-cyclic olefin, polysulfone, polyimide, silicone, polystyrene, polyacryl, and/or polyvinyl chloride film.

8. The transparent conductor according to claim 1 , further comprising one or more of a hard coating layer, an anti-corrosive layer, an anti-glare coating layer, an adhesion promoter, or a coating layer for reducing elution of an oligomer from the base layer on one or both sides of the base layer.

9. The transparent conductor according to claim 1 , wherein the metal nanowire comprises a silver nanowire.

10. The transparent conductor according to claim 1 , wherein the metal nanowire has an aspect ratio L/d of about 10 to about 1,000, the aspect ratio L/d being a ratio of a length L of the metal nanowire to a diameter d of a cross-section of the metal nanowire.

11. The transparent conductor according to claim 1 , wherein the metal nanowire is present in the transparent conductive film in an amount of not less than 13 wt % , based on the total weight of the transparent conductive film.

12. The transparent conductor according to claim 1 , wherein the transparent conductive film comprises:

a metal nanowire layer comprising a cured product of the metal nanowire, a binder and an initiator; and

an overcoat layer comprising a cured product of the binder and the initiator on the metal nanowire layer.

13. The transparent conductor according to claim 12 , wherein the binder comprises one or more of a urethane (meth)acrylate oligomer, or a (meth)acrylate based monofunctional or multifunctional monomer.

14. The transparent conductor according to claim 1 , wherein the transparent conductive film comprises a cured product of the metal nanowire, a binder and an initiator.

15. The transparent conductor according to claim 14 , wherein the binder comprises one or more of a urethane (meth)acrylate oligomer, or a (meth)acrylate based monofunctional or multifunctional monomer.

16. The transparent conductor according to claim 14 , wherein the cured product of the metal nanowire, the binder and the initiator comprises a cured product of a composition comprising about 13 wt % to about 23 wt % of the metal nanowire, about 75 wt % to about 85 wt % of the binder, and about 1 wt % to about 3 wt % of the initiator based on the total weight of solids in the composition.

17. The transparent conductor according to claim 1 , wherein the base layer has a thickness of about 50 μm to about 150 μm, and the transparent conductive film has a thickness of about 10 nm to about 1 μm.

18. The transparent conductor according to claim 1 , wherein the transparent conductor has an Ro of 120 nanometers (nm) to 150 nm at a wavelength of 450 nm, and an Ro of 130 nm to 155 nm at a wavelength of 650 nm.

19. An optical display apparatus comprising the transparent conductor according to claim 1 .

20. The transparent conductor according to claim 1 , wherein the retardation value of the in-plane direction, Ro, of the base layer is 150 nm to 280 nm at a wavelength of 550 nm.