Electronic device module

1. An electronic device module comprising:

a first substrate having a first wiring layer and a first alignment mark, the first alignment mark being transparent in a visible region of the electromagnetic spectrum; and

a second substrate facing a part of the first substrate and having a second wiring layer and a second alignment mark that is opaque in the visible region of the electromagnetic spectrum and faces the first alignment mark, the second substrate being placed on the first substrate disposed on an X-Y plane,

wherein the first alignment mark is configured to, from a second substrate side, be visible by illumination in a Z direction and be invisible by illumination in an inclined direction relative to the Z direction, and

wherein the second alignment mark is configured to, from the second substrate side, be visible by illumination in the inclined direction and be invisible by illumination in the Z direction.

2. The electronic device module according to claim 1 ,

wherein the first and second alignment marks are formed from a conductive film.

3. The electronic device module according to claim 2 ,

wherein the first wiring layer and the first alignment mark are formed from the same conductive film and the second wiring layer and the second alignment mark are formed from the same conductive film.

4. The electronic device module according to claim 1 ,

wherein the first and second alignment marks engage with each other.

5. The electronic device module according to claim 4 ,

wherein one of the first and second alignment marks has an annular portion;

wherein the other alignment mark has a circular portion fitting into a region surrounded by the annular portion.

6. The electronic device module according to claim 4 ,

wherein one of the first and second alignment marks has one or more groove portions;

wherein the other alignment mark has a linear portion extending along the one or more groove portions.

7. The electronic device module according to claim 6 ,

wherein two of each of the groove portions and the linear portions are provided;

wherein the two groove portions intersect each other in a plane parallel to a substrate surface.

8. The electronic device module according to claim 6 ,

wherein the first alignment mark has the groove portion and the second alignment mark has the linear portion;

wherein the groove portion extends on the first substrate and protrudes outward beyond an edge of the second substrate.

9. The electronic device module according to claim 1 ,

wherein the first substrate is a panel substrate forming at least a part of a touch panel or display panel;

wherein the second substrate is a printed board.

10. The electronic device module according to claim 9 ,

wherein the first substrate forms a part of the touch panel.

11. The electronic device module according to claim 9 ,

wherein the display panel has, on a pixel driving substrate in this order:

a liquid crystal display element; and

a counter substrate as the first substrate.

12. The electronic device module according to claim 9 ,

wherein the display panel has an organic electroluminescent element and a sealing substrate in this order on a pixel driving substrate;

wherein the first substrate is the pixel driving substrate or the sealing substrate on a light emitting side.

13. A method of producing an electronic device module, the electronic device module including a first substrate having a first wiring layer and a first alignment mark, the first alignment mark being transparent in a visible region of the electromagnetic spectrum, and a second substrate facing a part of the first substrate and having a second wiring layer and a second alignment mark that faces the first alignment mark and that is opaque in the visible region, the method comprising:

placing the second substrate on the first substrate disposed on an X-Y plane;

illuminating the first substrate and the second substrate by a first light source that directs light in a Z direction and by a second light source that directs light in an inclined direction inclined relative to the Z direction;

taking an image of the first alignment mark and the second alignment mark that are illuminated by the first light source and the second light source; and

aligning the first substrate and the second substrate based on the image including the first alignment mark and the second alignment mark.

14. The method of claim 13 , wherein:

the first alignment mark is configured to, from a second substrate side, be visible by illumination in a Z direction and be invisible by illumination in an inclined direction inclined relative to the Z direction, and

the second alignment mark is configured to, from a second substrate side, be visible by illumination in the inclined direction and be invisible by illumination in the Z direction.