Conductive film, touch panel including the conductive film and display apparatus including the conductive film
A conductive film for use in a touch panel, and including a sensor electrode formed on a base member in a sensor area and a non-active area, the sensor electrode including nano-material conductors defining a network structure; an over-coating layer configured to cover the sensor electrode in the sensor area and the non-active area; and a wiring electrode formed on the over-coating layer in the non-active area. Further, the over-coating layer includes a first portion located between the sensor electrode and the wiring electrode and includes a recess, the recess including at least one of a perforation formed through the over-coating layer and a thin film portion providing the first portion with a smaller thickness than a remaining portion of the over-coating layer.
1. A conductive film for use in a touch panel, the conductive film comprising:
a base member having a sensor area and a non-active area defined therein;
a sensor electrode formed on the base member in the sensor area and the non-active area, the sensor electrode including nano-material conductors defining a network structure;
an over-coating layer configured to cover the sensor electrode in the sensor area and the non-active area; and
a wiring electrode formed on the over-coating layer in the non-active area, the wiring electrode including a pad portion electrically connected to the sensor electrode and a wiring portion connected to the pad portion,
wherein the over-coating layer includes a first portion located between the sensor electrode and the wiring electrode and includes a recess,
wherein the recess includes a flat portion in the first portion, and a thin film portion having a smaller thickness than the flat portion, the thin film portion being disposed in the first portion,
wherein the recess has a greater area at a region distant from the base member than an area of a region close to the base member,
wherein the recess is disposed in a region overlapping the sensor electrode and the wiring electrode, and
wherein the recess includes a lateral surface having a greater surface roughness than a surface roughness of a surface of the over-coating layer.
2. The conductive film according to claim 1 , wherein the recess of the first portion includes a plurality of recesses at one first portion.
3. The conductive film according to claim 2 , wherein the plurality of recesses of the first portion are 4 to 64 in number at one first portion.
4. The conductive film according to claim 2 , wherein the plurality of recesses of the first portion are arranged in a matrix.
5. The conductive film according to claim 1 , wherein the recess is gradually increased in size with increasing distance from the base member.
6. The conductive film according to claim 1 , wherein the recess has a notch shape.
7. The conductive film according to claim 1 , wherein:
the surface roughness of the lateral surface of the recess is 10 nm or more; and
the surface roughness of the surface of the over-coating layer is below 10 nm.
8. The conductive film according to claim 1 , wherein:
the sensor electrode includes a plurality of sensor portions, connection portions configured to connect the sensor portions to one another, and a wiring connection portion extending from each of the sensor portions or the connection portions to the non-active area;
the wiring electrode includes the pad portion configured to fill the recess and connected to the wiring connection portion, and the wiring portion connected to the pad portion; and
the recess is located in a zone having an area within a range of 20% to 80% of an area of the wiring connection portion or the pad portion.
9. The conductive film according to claim 1 , wherein:
the sensor electrode includes a plurality of sensor portions, connection portions configured to connect the sensor portions to one another, and a wiring connection portion extending from each of the sensor portions or the connection portions to the non-active area;
the wiring electrode includes the pad portion configured to fill the recess and connected to the wiring connection portion and the wiring portion connected to the pad portion;
the recess of the first portion located between the sensor electrode and the wiring electrode includes a plurality of recesses at one first portion; and
the plurality of recesses at the one first portion have a total area within a range of 30% to 50% of an area of a zone provided with the recesses.
10. The conductive film according to claim 1 , wherein the recess has a width or diameter within a range of 10 μm to 100 μm.
11. The conductive film according to claim 1 , wherein:
the recess of the first portion located between the sensor electrode and the wiring electrode includes a plurality of recesses at one first portion; and
the plurality of recesses at the one first portion are spaced apart from one another by a distance within a range of 0.1 mm to 0.9 mm.
12. A touch panel comprising:
a base member having a sensor area and a non-active area defined therein;
a sensor electrode formed on the base member in the sensor area and the non-active area, the sensor electrode including nano-material conductors defining a network structure;
an over-coating layer configured to cover the sensor electrode in the sensor area and the non-active area;
a wiring electrode formed on the over-coating layer in the non-active area, the wiring electrode including a pad portion electrically connected to the sensor electrode and a wiring portion connected to the pad portion; and
another sensor electrode spaced apart from the sensor electrode and configured extending in a direction crossing the sensor electrode of the conductive film,
wherein the over-coating layer includes a first portion located between the sensor electrode and the wiring electrode and includes a recess,
wherein the recess includes a flat portion in the first portion, and a thin film portion having a smaller thickness than the flat portion, the thin film portion being disposed in the first portion,
wherein the recess has a greater area at a region distant from the base member than an area of a region close to the base member,
wherein the recess is disposed in a region overlapping the sensor electrode and the wiring electrode, and
wherein the recess includes a lateral surface having a greater surface roughness than a surface roughness of a surface of the over-coating layer.
13. A display apparatus comprising:
a touch panel including:
a base member having a sensor area and a non-active area defined therein;
a sensor electrode formed on the base member in the sensor area and the non-active area, the sensor electrode including nano-material conductors defining a network structure;
an over-coating layer configured to cover the sensor electrode in the sensor area and the non-active area;
a wiring electrode formed on the over-coating layer in the non-active area, the wiring electrode including a pad portion electrically connected to the sensor electrode and a wiring portion connected to the pad portion; and
another sensor electrode spaced apart from the sensor electrode and configured extending in a direction crossing the sensor electrode of the conductive film; and
a display panel located at a rear side of the touch panel to display an image,
wherein the over-coating layer includes a first portion located between the sensor electrode and the wiring electrode and includes a recess,
wherein the recess includes a flat portion in the first portion, and a thin film portion having a smaller thickness than the flat portion, the thin film portion being disposed in the first portion,
wherein the recess has a greater area at a region distant from the base member than an area of a region close to the base member,
wherein the recess is disposed in a region overlapping the sensor electrode and the wiring electrode, and
wherein the recess includes a lateral surface having a greater surface roughness than a surface roughness of a surface of the over-coating layer.