Display panel and preparing method thereof

1. A display panel having a display area and a non-display area around the display area, comprising:

a first metal layer having at least one first wire, wherein the first wire extends from the display area to the non-display area;

a first insulating layer disposed in the display area and the non-display area and covering the first metal layer, wherein the first insulating layer has at least one first through hole passing through the first insulating layer and extending to a surface of one of the at least one first wire;

a second metal layer having at least one second wire, wherein each of the at least one second wire is disposed on the first insulating layer in the non-display area and correspondingly connects one of the at least one first wire through one of the at least one first through hole;

a second insulating layer disposed in the display area and the non-display area and covering the first insulating layer and the first metal layer, wherein the second insulating layer has at least one second through hole passing through the second insulating layer and extending to a surface of one of the at least one second wire;

a third metal layer having at least one third wire, wherein each of the at least one third wire is disposed on the second insulating layer in the non-display area; and

a bridging layer having at least one bridging wire, wherein each of the at least one bridging wire extends from one of the at least one second wire in one of the at least one second through hole to one of the at least one the third wire corresponding to the one of the at least one the second wire,

wherein the first insulating layer further has at least one fifth through hole passing through the first insulating layer and extending to a surface of one of the at least one first wire; and

the second metal layer further has at least one fourth wire, each of the at least one fourth wire is disposed on the first insulating layer in the display area, each of the at least one fourth wire correspondingly passes through one of the at least one fifth through hole and connects one of the at least one first wire corresponding to the one of the at least one fifth through hole.

2. The display panel according to claim 1 , further comprising:

a passivation layer disposed between the second insulating layer and the bridging layer and covering the third metal layer.

3. The display panel according to claim 2 , wherein the passivation layer includes:

at least one third through hole passing through the passivation layer and corresponding to one of the at least one second through hole; and

at least one fourth through hole passing through the passivation layer and extending to a surface of one of the at least one third wire;

wherein the bridging wire passes through the third through hole from the second wire in the second through hole and extends to the third wire in the fourth through hole.

4. The display panel according to claim 3 , wherein the third through hole and the fourth through hole are located at one end of the non-display area near the display area, and the third through hole and the fourth through hole are spaced and arranged in a line.

5. The display panel according to claim 1 , wherein a material of the bridging wire includes indium tin oxides.

6. A preparing method of a display panel, comprising steps of:

providing a substrate having a display area and a non-display area around the display area;

forming a first metal layer on the substrate, and forming at least one first wire in the first metal layer, wherein the first wire extends from the display area to the non- di splay area;

forming a first insulating layer on the substrate and the first metal layer, and forming at least one first through hole in the first insulating layer, wherein each of the at least one first through hole corresponds to one of the at least one first wire;

forming a second metal layer on the first insulating layer, and forming at least one second wire in the second metal layer in the non-display area, wherein the second wire connects one of the at least one first wire through one of the at least one first through hole;

forming a second insulating layer on the first insulating layer and the second metal layer, and forming at least one second through hole in the second insulating layer, wherein each of the first through hole corresponds to one of the at least one second wire;

forming a third metal layer on second insulating layer on the non-display area, and forming at least one third wire in the third metal layer; and

forming a bridging layer on the second insulating layer, and forming at least one bridging wire in the bridging layer, wherein the bridging wire extends from the second wire in the second through hole to the third wire corresponding to the second wirer wherein the step of forming a first insulating layer on the substrate and the first metal layer further comprises a step of:

forming at least one fifth through hole in the first insulating layer, wherein the fifth through hole corresponds to the first wire; and

the step of forming a second metal layer on the first insulating layer further comprises a step of:

forming at least one fourth wire on the first insulating layer in the display area while forming the second wire, wherein the fourth wire passes through the fifth through hole and connects the first wire corresponding to the fifth through hole.

7. The preparing method of a display panel according to claim 6 , further comprising a step of:

forming a passivation layer on the second insulating layer and the third metal layer.

8. The preparing method of a display panel according to claim 7 , further comprising a step of:

forming at least one third through hole and at least one fourth through hole in the passivation layer, wherein each of the at least one third through hole corresponds one of the at least one first through hole, and each of the at least one fourth through hole corresponds to one of the at least one third wire.