Display device with organic insulating film having a trench therein formed on substrate

1. A display device comprising a substrate in which a plurality of wirings and a plurality of switching elements are formed,

the substrate comprising:

an organic insulating film formed over the substrate;

a first stack wiring pattern and a second stack wiring pattern arranged in parallel on the organic insulating film;

a trench formed in the organic insulating film between the first stack wiring pattern and the second stack wiring pattern; and

a protection film formed to cover the first stack wiring pattern, the second stack wiring pattern, and the trench.

2. The display device according to claim 1 ,

wherein a depth of the trench is a size within a range of ⅓ or more of a thickness of the organic insulating film.

3. The display device according to claim 1 ,

wherein the first stack wiring pattern and the second stack wiring pattern differ from each other in potential.

4. The display device according to claim 3 ,

wherein the first stack wiring pattern supplies a voltage of a first potential to a first electrode, and

wherein the second stack wiring pattern supplies a voltage of a second potential to a second electrode.

5. The display device according to claim 4 ,

wherein each of the first electrode and the second electrode functions as an electrode of detecting proximity or contact of an object and as an electrode of displaying an image.

6. The display device according to claim 1 ,

wherein the first stack wiring pattern is formed of a plurality of first wirings and the second stack wiring pattern is formed of a plurality of second wirings,

wherein the plurality of the first wirings and the plurality of the second wirings are each arranged in parallel on the organic insulating film, and

wherein the trench is formed in the organic insulating film between the adjacent first stack wiring pattern and second stack wiring pattern.

7. The display device according to claim 1 ,

wherein each of the first stack wiring pattern and the second stack wiring pattern includes:

a first wiring layer formed on the organic insulating film;

a second wiring layer formed over the first wiring layer;

a third wiring layer formed over the second wiring layer; and

a fourth wiring layer formed over the third wiring layer.

8. The display device according to claim 7 ,

wherein, in each of the first stack wiring pattern and the second stack wiring pattern, a width of the first wiring layer is larger than each width of the second wiring layer, the third wiring layer, and the fourth wiring layer.

9. The display device according to claim 8 ,

wherein the first wiring layer is formed of ITO, and

wherein each of the second to fourth wiring layers is formed of a metal.