Display device

1. A display device, comprising:

a first substrate configured to be disposed on a rear surface side; and

a second substrate configured to be disposed on a display screen side, wherein

the first substrate and the second substrate are arranged opposite to each other,

the first substrate includes a plurality of first signal lines which are arranged in an image display area and a plurality of driving circuits which drive the plurality of first signal lines,

the driving circuit comprises a first bump and a second bump,

the first bump is electrically connected to a first metal line which is formed in the first substrate,

the first metal line is electrically connected via a contact hole to a first lead-out line which is electrically connected to one of the plurality of first signal lines,

the second bump is electrically connected via a contact hole to a second lead-out line which is electrically connected to another of the plurality of first signal lines,

the first lead-out line is formed in a layer different from that of the first metal line in the first substrate while the second lead-out line is formed in a same layer as that of the first metal line in the first substrate,

the first metal line and the second lead-out line are formed in the same layer as the plurality of first signal lines,

the first lead-out line is formed in the same layer as a plurality of second signal lines, and

the plurality of first signal lines are data lines, and the plurality of second signal lines are gate lines.

2. The display device according to claim 1 , wherein

the first metal line is electrically connected to the first lead-out line via a first contact hole which is formed in an area of the first substrate overlapping the driving circuit in planar view, and

the first bump is electrically connected to the first metal line via a second contact hole which is formed in the area.

3. The display device according to claim 1 , wherein

the first lead-out line is formed on a glass substrate of the first substrate,

a first insulating layer is formed so as to cover the first lead-out line,

the first metal line is formed on the first insulating layer,

a second insulating layer is formed so as to cover the first metal line,

the first contact hole is formed in the first insulating layer and the second insulating layer,

the second contact hole is formed in the second insulating layer,

the first metal line and the first lead-out line are electrically connected via a first transparent electrode which is formed in the first contact hole, and

the first metal line and the first bump are electrically connected via a second transparent electrode which is formed in the second contact hole.

4. The display device according to claim 3 , wherein

the first transparent electrode and the second transparent electrode are covered with a resin adhesive to connect the driving circuit to the first substrate in the area.

5. The display device according to claim 1 , wherein

a plurality of the first and second lead out lines are present, and the first lead-out lines and the second lead-out lines are formed alternately in two layers which are different from each other, and

an insulating layer is formed between the layer of first lead-out lines and the layer of the second lead-out lines.

6. The display device according to claim 2 , wherein

the second contact hole is formed at a position near the image display area from the first contact hole.

7. The display device according to claim 4 ,

wherein the resin adhesive has conductive particles, and

wherein at least a part of the conductive particle is present within the contact hole.