Transparent electrode, touch sensor and image display device including the same
A transparent electrode includes a first metal oxide layer, a metal layer and a second metal oxide layer. The first metal oxide layer, the metal layer and the second metal oxide layer are sequentially stacked to form a mesh pattern. A reflectivity at a wavelength of 550 nm of the mesh pattern is in a range from 5% to 20%.
1. A film touch sensor, comprising:
a separation layer which is detachable from a carrier substrate; and
a touch sensor formed on the separation layer, the touch sensor including a transparent electrode comprising:
a first metal oxide layer;
a metal layer; and
a second metal oxide layer,
wherein the first metal oxide layer, the metal layer and the second metal oxide layer are sequentially stacked in a mesh pattern form;
the transparent electrode includes a plurality of isolated sensing patterns which are disposed on the same plane; and
a reflectivity at a wavelength of 550 nm of the mesh pattern is in a range from 5% to 20%.
2. The film touch sensor of claim 1 , wherein the reflectivity at a wavelength of 550 nm is in a range from about 5% to 13%.
3. The film touch sensor of claim 1 , wherein a refractive index of each the first metal oxide layer and the second metal oxide layer at a wavelength of 550 nm is in a range from 1.7 to 2.2; and
a refractive index of the metal layer at a wavelength of 550 nm is in a range from 0.1 to 1.0, and an extinction coefficient of the metal layer is in a range from 2.0 to 7.0.
4. The film touch sensor of claim 1 , wherein a thickness of each the first metal oxide layer and the second metal oxide layer is in a range from 5 nm to 140 nm, and a thickness of the metal layer is in a range from 5 nm to 30 nm.
5. The film touch sensor of claim 1 , wherein a thickness of each the first metal oxide layer and the second metal oxide layer is in a range from 30 nm to 50 nm, and a thickness of the metal layer is in a range from 8 nm to 15 nm.
6. The film touch sensor of claim 1 , wherein a line-width of the mesh pattern is in a range from 1 μm to 7 μm.
7. The film touch sensor of claim 1 , wherein each the first metal oxide layer and the second metal oxide layer includes at least one selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), aluminum zinc oxide (AZO), gallium zinc oxide (GZO), indium tin zinc oxide (ITZO), zinc tin oxide (ZTO), indium gallium oxide (IGO), tin oxide (SnO 2 ) and zinc oxide (ZnO).
8. The film touch sensor of claim 1 , wherein the metal layer includes at least one selected from the group consisting of silver, gold, copper, aluminum, platinum, palladium, chromium, titanium, tungsten, niobium, tantalum, vanadium, calcium, iron, manganese, cobalt, nickel, zinc, and an alloy thereof.
9. The film touch sensor of claim 1 , wherein a haze of the transparent electrode is in a range from −1% to +1%.
10. The film touch sensor of claim 1 , wherein a color difference (b*) of the transparent electrode is in a range from −4 to +4.
11. The film touch sensor of claim 1 , wherein a linear resistance is not changed when the transparent electrode is folded with a radius curvature of 1 mm or more along an 180° direction.
12. The film touch sensor of claim 1 , wherein the sensing patterns comprise:
a first sensing pattern formed along a first direction;
a second sensing pattern formed along a second direction; and
a bridge electrode connecting isolated unit patterns of the second sensing pattern.
13. The film touch sensor of claim 1 , wherein the touch sensor is a self-capacitance type.
14. The film touch sensor of claim 1 , further comprising a protective layer between the touch sensor and the separation layer.
15. An image display device comprising the film touch sensor of claim 1 .