Capacitive transparent conductive film and preparation method thereof
A capacitive transparent conductive film comprises: a transparent substrate, comprises a first surface and a second surface which is opposite to the first surface; a light-shield layer, formed at the edge of the first surface of the transparent substrate, the light-shield layer forms a non-visible region on the first surface of the transparent substrate; and a polymer layer, formed on the first surface of the transparent substrate, and covering the light-shield layer, the surface of the polymer layer is patterned to form a meshed trench, the trench is filled with conductive material to form a sensing region on the surface of the polymer layer. The capacitive transparent conductive film can effectively protect the conductive material and has low cost and good conductivity. A preparation method of the capacitive transparent conductive film is also provided.
1. A capacitive transparent conductive film, comprising:
a transparent substrate comprising a first surface and a second surface opposite to the first surface;
a light-shield layer formed at an edge of the first surface of the transparent substrate, the light-shield layer forming a non-visible region on the first surface of the transparent substrate; and
a polymer layer formed on the first surface of the transparent substrate and covering the light-shield layer, a surface of the polymer layer being patterned to form a meshed trench, the trench being filled with a conductive material to form a sensing region on a surface of the polymer layer.
2. The capacitive transparent conductive film according to claim 1 , wherein the non-visible region of the capacitive transparent conductive film has traces, conductive materials of the traces are electrically connected to the conductive material in the trench, and the traces are attached to the surface of the polymer layer.
3. The capacitive transparent conductive film according to claim 2 , wherein conductive materials of the traces are directly connected to the conductive material in the trench.
4. The capacitive transparent conductive film according to claim 2 , wherein the sensing region is provided with a line segment at an edge thereof electrically connected to the conductive material in the trench, the conductive materials of the traces are electrically connected to the conductive material in the trench by the line segment.
5. The capacitive transparent conductive film according to claim 2 , wherein the traces are grid lines, the traces are electrically connected to the conductive material in the trench by a node.
6. The capacitive transparent conductive film according to claim 2 , wherein the traces are formed on the non-visible region by screen printing or inkjet printing.
7. The capacitive transparent conductive film according to claim 2 , wherein the traces are composed of patterned grids or line segments.
8. The capacitive transparent conductive film according to claim 7 , wherein a line width of the patterned grid ranges from 2 μm to 50 μm, a height of the patterned grid ranges from 5 μm to 10 μm, length of the patterned grid is less than 100 μm.
9. The capacitive transparent conductive film according to claim 7 , wherein a width of the line segment ranges from 50 μm to 200 μm, a height of the line segment ranges from 5 μm to 10 μm.
10. The capacitive transparent conductive film according to claim 1 , wherein a width of the light-shield layer ranges from 1 mm to 5 mm.
11. The capacitive transparent conductive film according to claim 1 , wherein a width of the trench ranges from 1 μm to 5 μm, a depth of the trench ranges from 2 μm to 6 μm, and a depth to width ratio of the trench is greater than 1.
12. The capacitive transparent conductive film according to claim 1 , wherein the sensing region is a visible region, a light transmittance of the visible region is greater than 89%.
13. The capacitive transparent conductive film according to claim 1 , wherein a cell of the grid is a regular polygon, a ratio of the area of each cell covered by a conductive material to a total area of each cell is less than 5%.
14. The capacitive transparent conductive film according to claim 2 , further comprising a transparent protective layer, wherein the transparent protective layer covers the surface of the polymer layer except for output ends of the trace region.
15. The capacitive transparent conductive film according to claim 1 , wherein the polymer layer is made of a material selected from a group consisting of UV curable adhesive, polyethylene terephthalate, polycarbonate, and polymethyl methacrylate.
16. The capacitive transparent conductive film according to claim 1 , wherein the transparent substrate is a transparent glass plate.
17. The capacitive transparent conductive film according to claim 1 , wherein the conductive material is selected from a group consisting of metal, indium tin oxide, transparent polymer materials, graphene, and carbon nanotubes.
18. A method of preparating a capacitive transparent conductive film, comprising the following steps:
forming the light-shield layer at an edge of the first surface of the transparent substrate to form the non-visible region;
coating the first surface of the transparent substrate to form the polymer layer, patterning the polymer layer to form the trench, then filling the trench with a conductive material to form the sensing region; and
printing the traces at an edge of the sensing region of the surface of the polymer layer, and electrically connecting the traces to the conductive material in the trench.