Display device
It is possible to reduce a size of a lower frame region to ensure a wiring corrosion margin equivalent to that of a conventional technique. In a display device, a video signal wiring arranged in the lower frame region includes, in a region between a terminal section (terminal) and a video signal line, a first wiring formed on a first wiring layer and having one end connected to the terminal section to which a video signal line driving circuit is connected, a second wiring formed on a second wiring layer different from the first wiring layer and having one end connected to the other end of the first wiring, and a third wiring formed on the first wiring layer and having one end connected to the other end of the second wiring. The other end of the third wiring is connected to the video signal line via a fourth wiring formed on the second wiring layer, and the first wiring layer is formed on the side closer to an array substrate than to the second wiring layer.
1. A display device comprising:
a first substrate and a second substrate arranged opposite the first substrate, and including, on a first substrate, a display region and a frame region formed around the display region in a plan view;
a plurality of pixels, a plurality of scanning signal lines, and a plurality of video signal lines arranged in the display region;
a plurality of video signal wirings electrically connected to the plurality of video signal lines, and a plurality of terminal sections for feeding a video signal to the plurality of video signal wirings, the video signal wirings and the terminal sections being arranged in the frame region; and
a selection circuit selecting the video signal lines for a video signal to be fed,
wherein in a region between each of the terminal sections and each of the video signal lines, each of the video signal wirings arranged in the frame region comprises:
a first wiring formed on a first wiring layer and including one end connected to a terminal to which a driving circuit is connected;
a second wiring formed on a second wiring layer different from the first wiring layer and including one end connected to a second end of the first wiring; and
a third wiring formed on the first wiring layer and including one end connected to a second end of the second wiring,
a second end of the third wiring is connected to the video signal lines via a fourth wiring formed on the second wiring layer,
the first wiring layer is formed on a side closer to the first substrate than to the second wiring layer,
the first substrate includes a first region overlapping the second substrate and a second region exposed from the second substrate,
the first wiring and the one end of the second wiring are in the second region, and
the third wiring and the second end of the second wiring are in the first region,
wherein opposite surfaces of the first wiring and the third wiring to the first substrate are covered with an inorganic insulating film,
connections between the first and second wirings, between the second and third wirings, and between the third and fourth wirings are respectively made to each other via contact sections of openings formed in the inorganic insulating film,
the first wring and the contact section of the second wiring are in the second region, and
the second wiring and the contact section of the third wiring are in the first region, and
wherein the selection circuit is arranged in the frame region and in a region between the driving circuit and the display region in a plan view, and is arranged between each of the video signal lines and the fourth wiring.
2. The display device according to claim 1 ,
wherein the first wiring layer is a layer on which the plurality of scanning signal lines are arranged, and
the second wiring layer is a layer on which the plurality of video signal lines are arranged.
3. The display device according to claim 2 ,
wherein opposite surfaces of the second wiring and the fourth wiring to the first substrate are covered with an organic insulating film.
4. The display device according to claim 3 ,
wherein a non-formation region of the organic insulating film is arranged between a formation region of the second wiring and a formation region of the fourth wiring, and the
third wiring overlaps the non-formation region of the organic insulating film.
5. The display device according to claim 1 ,
wherein each material for the first wiring and the third wiring formed on the first wiring layer, and each material for the second wiring and the fourth wiring formed on the second wiring layer differ from each other, and
a specific resistance of each material for the second wiring and the fourth wiring is lower than a specific resistance of each material for the first wiring and the third wiring.
6. The display device according to claim 5 ,
wherein each thickness of the second wiring and the fourth wiring is larger than each thickness of the first wiring and the third wiring.
7. The display device according to claim 3 ,
wherein an end surface of the organic insulating film overlapping the second wiring is covered with an insulating film in the second region not overlapping the second substrate.
8. The display device according to claim 4 , further comprising:
a seal provided between the first substrate and the second substrate and making the first substrate and the second substrate adhere to each other; and
a liquid crystal layer sealed between the first substrate and the second substrate.
9. The display device according to claim 8 ,
wherein the seal is arranged in the non-formation region.
10. A display device comprising:
a first substrate and a second substrate arranged opposite the first substrate, and including, on a first substrate, a display region and a frame region formed around the display region in a plan view;
a plurality of pixels, a plurality of scanning signal lines, and a plurality of video signal lines arranged in the display region; and
a plurality of video signal wirings electrically connected to the plurality of video signal lines, and a plurality of terminal sections for feeding a video signal to the plurality of video signal wirings, the video signal wirings and the terminal sections being arranged in the frame region,
wherein in a region between each of the terminal sections and each of the video signal lines, each of the video signal wirings arranged in the frame region comprises:
a first wiring formed on a first wiring layer and including one end connected to a terminal to which a driving circuit is connected;
a second wiring formed on a second wiring layer different from the first wiring layer and including one end connected to a second end of the first wiring; and
a third wiring formed on the first wiring layer and including one end connected to a second end of the second wiring,
a second end of the third wiring is connected to the video signal lines via a fourth wiring formed on the second wiring layer,
the first wiring layer is formed on a side closer to the first substrate than to the second wiring layer,
the first substrate includes a first region overlapping the second substrate and a second region exposed from the second substrate,
the first wiring and the one end of the second wiring are in the second region, and
the third wiring and the second end of the second wiring are in the first region,
wherein the display device comprises a selection circuit selecting the video signal lines for a video signal to be fed, the selection circuit being arranged in the frame region and in a region between the driving circuit and the display region in a plan view,
wherein the selection circuit is arranged between each of the video signal lines and the fourth wiring.
11. The display device according to claim 10 ,
wherein the first wiring layer is a layer on which the plurality of scanning signal lines are arranged, and
the second wiring layer is a layer on which the plurality of video signal lines are arranged.
12. The display device according to claim 11 ,
wherein opposite surfaces of the second wiring and the fourth wiring to the first substrate are covered with an organic insulating film.
13. The display device according to claim 12 ,
wherein a non-formation region of the organic insulating film is arranged between a formation region of the second wiring and a formation region of the fourth wiring, and
the third wiring overlaps the non-formation region of the organic insulating film.
14. The display device according to claim 10 ,
wherein each material for the first wiring and the third wiring formed on the first wiring layer, and each material for the second wiring and the fourth wiring formed on the second wiring layer, differ from each other, and
a specific resistance of each material for the second wiring and the fourth wiring is lower than a specific resistance of each material for the first wiring and the third wiring.
15. The display device according to claim 14 ,
wherein each thickness of the second wiring and the fourth wiring is larger than each thickness of the first wiring and the third wiring.
16. The display device according to claim 12 ,
wherein an end surface of the organic insulating film overlapping the second wiring is covered with an insulating film in the second region not overlapping the second substrate.
17. The display device according to claim 13 , further comprising:
a seal provided between the first substrate and the second substrate and making the first substrate and the second substrate adhere to each other; and
a liquid crystal layer sealed between the first substrate and the second substrate,
wherein the seal is arranged in the non-formation region.