Touch panel and manufacturing method thereof

A touch panel having a touch region and a trace region at least disposed on a side of the touch region, comprising:

• a substrate;
• a touch device disposed on a top surface of the substrate in the touch region, and the touch device comprising a plurality of electrode pads;
• and
• a first shielding trace disposed on the top surface of the substrate in the trace region and insulated from the touch device, wherein the first shielding trace comprises a first trace layer and a second trace layer electrically connected to each other, in a direction perpendicular to the top surface of the substrate, the first trace layer at least partially overlaps the second trace layer, and the second trace layer and the electrode pads are formed of a transparent conductive pattern layer,
• wherein the first trace layer is disposed between the substrate and the second trace layer, a thickness of the first trace layer is less than a thickness of the second trace layer, the second trace layer comprises a top portion and a bottom portion, the bottom portion is disposed between the top portion and the first trace layer, a width of the top portion is greater than a width of the bottom portion, and the width of the top portion is greater than or equal to a width of the first trace layer, and
• wherein the width of the top portion complies with a formula:
• (W1−W3)/2≤G/2, where W1 is the width of the top portion, W3 is the width of the first trace layer, and G is a distance between the first trace layer and one of the conductive traces closest to the first trace layer.

A manufacturing method of a touch panel, comprising:

• providing a substrate;
• and
• forming a touch device on the substrate in a touch region and forming a shielding trace and a plurality of conductive traces on the substrate in a trace region, wherein the shielding trace is disposed between two of the conductive traces,
• wherein the touch device is insulated from the shielding trace and comprises a plurality of electrode pads, at least a part of the conductive traces is electrically connected to the touch device, and the shielding trace comprises a first trace layer and a second trace layer electrically connected to each other,
• wherein in a direction perpendicular to a top surface of the substrate, the first trace layer at least partially overlaps the second trace layer, and the shielding trace doesn't overlap the conductive traces,
• wherein the first trace layer is disposed between the substrate and the second trace layer, a thickness of the first trace layer is less than a thickness of the second trace layer, the second trace layer comprises a top portion and a bottom portion, the bottom portion is disposed between the top portion and the first trace layer, a width of the top portion is greater than a width of the bottom portion, and the width of the top portion is greater than or equal to a width of the first trace layer, and
• wherein the width of the top portion complies with a formula:
• (W1−W3)/2≤G/2, where W1 is the width of the top portion, W3 is the width of the first trace layer, and G is a distance between the first trace layer and one of the conductive traces closest to the first trace layer.