Touch screen
A touch screen, includes a substrate, a first embossing adhesive layer, a first metal conductive layer, a first electrode lead, a transparent insulating film, a second embossing adhesive layer, a second metal conductive layer and a second electrode lead, and has low material cost since the conductive layers are made of metal materials; a first slot is provided in the transparent insulating film, a second slot is provided in the second embossing adhesive layer, the first slot and the second slot directly face a free end of the first electrode lead, and a free end of the second electrode lead is positioned around the second slot, thus the free ends of the first and second electrode leads are exposed to the same side of the substrate and electrically connected with a circuit board, thus simplifying adhering process and structural design of the circuit board, and reducing manufacturing cost.
1. A touch screen, comprising a substrate, wherein the touch screen further comprises:
a first embossing adhesive layer, formed on a side of the substrate, wherein a first metal conductive layer is embedded in the first embossing adhesive layer, the first metal conductive layer comprises a plurality of first conductive strips mutually insulated from each other, wherein the substrate is soda lime glass or aluminosilicate glass, and siloxy of a surface of the substrate adjacent to the first embossing adhesive layer is bonded with the first embossing adhesive layer;
a first electrode lead, formed on the first embossing adhesive layer and electrically connected with the first conductive strip;
a transparent insulating film, comprising a first surface and a second surface opposite to the first surface, wherein the first surface faces the first embossing adhesive layer;
a second embossing adhesive layer, formed on the second surface of the transparent insulating film, wherein a second metal conductive layer is embedded in the second embossing adhesive layer, the second metal conductive layer comprises a plurality of second conductive strips mutually insulated from each other;
a second electrode lead, formed on the second embossing adhesive layer and electrically connected with the second conductive strip; and a first slot provided in the transparent insulating film, and a second slot provided in the second embossing adhesive layer, wherein the first slot and the second slot both directly face a free end of the first electrode lead, and a free end of the second electrode lead is positioned around the second slot;
wherein the first electrode lead and the second electrode lead are both a grid structure formed by cross-connecting of conductive wires in a grid;
wherein the first conductive strip and the second conductive strip each comprises a conductive grid composed of a plurality of metal wires, wherein projection of the conductive grid of the first conductive strip on the second metal conductive layer overlaps the conductive grid of the second conductive strip;
wherein a strip-shaped first connecting portion formed by cross-connecting conductive wires in a grid is provided at an end of the first electrode lead, and the first connecting portion is wider than other parts of the first electrode lead; and a strip-shaped second connecting portion formed by cross-connecting conductive wires in a grid is provided at an end of the second electrode lead and the second connecting portion is wider than other parts of the second electrode lead;
wherein a first electrode tieline is connected to the strip-shaped first connecting portion and a second electrode tieline is connected to the strip-shaped second connecting portion, and the first electrode tieline and the second electrode tieline are rectangular and continuous conductive wires, and wherein the first electrode tieline is electrically connected with at least two metal wires of the first conductive strip, the second electrode tieline is electrically connected with at least two metal wires of the second conductive strip;
wherein the second embossing adhesive layer is formed directly on the second surface of the transparent insulating film.
2. The touch screen according to claim 1 , wherein the touch screen further comprises an optical transparent adhesive layer, the optical transparent adhesive layer is provided between the first embossing adhesive layer and the first surface of the transparent insulating film, wherein a third slot is provided in the optical transparent adhesive layer and directly faces the free end of the first electrode lead.
3. The touch screen according to claim 1 , wherein a first patterned groove is provided on a side of the first embossing adhesive layer away from the substrate, wherein metal wires of the first metal conductive layer are accommodated in the first groove; and a second patterned groove is provided on a side of the second embossing adhesive layer away from the second surface of the transparent insulating film, wherein metal wires of the second metal conductive layer are accommodated in the second groove.
4. The touch screen according to claim 3 , wherein a depth to width ratio of the first groove is not less than 1, and a depth to width ratio of the second groove is not less than 1.
5. The touch screen according to claim 3 , wherein roughness of the surface of the substrate adjacent to the first embossing adhesive layer is 5˜10 nm.
6. The touch screen according to claim 1 , wherein metal wires of the first conductive strip are attached to the substrate, and the first conductive strip is located between the substrate and the first embossing adhesive layer.
7. The touch screen according to claim 1 , wherein a grid cycle of the first electrode lead and the second electrode lead are both less than a grid cycle of the first metal conductive layer and the second metal conductive layer.
8. The touch screen according to claim 1 , wherein the strip-shaped first connecting portion and the first electrode tieline have the same width, and the strip-shaped second connecting portion and the second electrode tieline have the same width.