Display device

1. A display device, comprising:

a first substrate;

a light-emitting element over the first substrate;

a sealing film located over the light-emitting element and covering the light-emitting element;

a first insulating layer over the sealing film;

a second insulating layer over the sealing film; and

a light-shielding layer overlapping the second insulating layer in a plan view,

wherein the first insulating layer has an opening in a region thereof overlapping a light-emitting region of the light-emitting element in a plan view, the light-emitting region being exposed through the opening,

at least a part of the second insulating layer is located in the opening,

the second insulating layer has a depression in a first region thereof overlapping the light-emitting region in a plan view,

the light-shielding layer is located in a second region overlapping the light-emitting region of the light-emitting element in a plan view, and

a first refractive index of the first insulating layer is lower than a second refractive index of the second insulating layer.

2. The display device according to claim 1 , further comprising a second substrate facing the first substrate,

wherein the light-shielding layer is provided to the second substrate.

3. The display device according to claim 1 , wherein the depression has an inverted-conical shape or an inverted-pyramidal shape.

4. The display device according to claim 1 , wherein the depression has a first inclined surface,

the first insulating layer has a second inclined surface in the opening,

the first inclined surface totally reflects light emitted vertically upward from the light-emitting element with respect to the first substrate, and

the second inclined surface totally reflects light horizontally incident from the first inclined surface.

5. The display device according to claim 1 , wherein a density of the second insulating layer becomes lower from a side touching the first insulating layer toward a first inclined surface of the depression.

6. The display device according to claim 1 , wherein the second insulating layer includes a first layer and a second layer located on a side of the first layer that faces the light-shielding layer, and

a first density of the first layer is higher than a second density of the second layer.

7. The display device according to claim 1 , wherein the first insulating layer contains silicon oxide or organic resin, and

the second insulating layer contains silicon nitride.

8. A display device, comprising:

a first substrate;

a plurality of light-emitting elements over the first substrate;

a sealing film located over the light-emitting elements and covering the plurality of light-emitting elements;

a first insulating layer over the sealing film;

a second insulating layer over the sealing film;

a light-shielding layer overlapping the second insulating layer in a plan view; and

a second substrate over the light-shielding layer,

wherein the first insulating layer has a plurality of openings,

each of the plurality of openings overlaps a light-emitting region of a corresponding one of the plurality of light-emitting elements in a plan view and exposes the light-emitting region,

at least a part of the second insulating layer is located in the opening,

the second insulating layer has an inverted-conical or inverted-pyramidal depression in each region thereof overlapping a corresponding one of the light-emitting regions in a plan view,

the light-shielding layer has a first region located in a region overlapping the light-emitting region,

the light-shielding layer has a second region located in a region between adjacent ones of the plurality of light-emitting elements, and

a first refractive index of the first insulating layer is lower than a second refractive index of the second insulating layer.

9. The display device according to claim 8 , wherein the second insulating layer has a first inclined surface constituting a half angle of the inverted-conical or inverted-pyramidal depression,

the first insulating layer has a second inclined surface in the opening,

the first inclined surface totally reflects light emitted vertically upward from the light-emitting element, and

the second inclined surface totally reflects light horizontally incident from the first inclined surface.

10. The display device according to claim 8 , wherein a density of the second insulating layer becomes lower from a side touching the first insulating layer toward an inclined surface constituting a half angle of the inverted-conical or inverted-pyramidal depression of the second insulating layer.

11. The display device according to claim 8 , wherein the second insulating layer includes a first layer and a second layer located on a side of the first layer that faces the light-shielding layer, and

a first density of the first layer is higher than a second density of the second layer.

12. A display device, comprising:

a first substrate;

a light-emitting element over the first substrate;

a sealing film located over the light-emitting element and covering the light-emitting element;

a first insulating layer over the sealing film;

a second insulating layer over the sealing film;

a light-shielding layer overlapping the second insulating layer in a plan view; and

a second substrate over the light-shielding layer,

wherein the first insulating layer has an opening in a region thereof overlapping a light-emitting region of the light-emitting element in a plan view, the light-emitting region being exposed through the opening,

at least a part of the second insulating layer is located in the opening,

the second insulating layer has an inverted-conical or inverted-pyramidal depression in a region thereof overlapping the light-emitting region in a plan view,

the light-shielding layer is located in a region overlapping the light-emitting region of the light-emitting element in a plan view,

the second insulating layer has a first inclined surface constituting a half angle of the inverted-conical or inverted-pyramidal depression,

the first insulating layer has a second inclined surface in the opening,

the first inclined surface totally reflects light emitted vertically upward from the light-emitting element,

the second inclined surface has a first region that totally reflects light horizontally incident from the first inclined surface and a second region that transmits the light totally reflected by the first inclined surface, and

a first width of the first region as viewed in cross-section is larger than a second width of the second region as viewed in cross-section.

13. The display device according to claim 12 , wherein a first refractive index of the first insulating layer is lower than a second refractive index of the second insulating layer.

14. The display device according to claim 12 , wherein a density of the second insulating layer becomes lower from a side touching the first insulating layer toward an inclined surface constituting a half angle of the inverted-conical or inverted-pyramidal depression of the second insulating layer.

15. The display device according to claim 12 , wherein the second insulating layer includes a first layer and a second layer located on a side of the first layer that faces the light-shielding layer, and

a first density of the first layer is higher than a second density of the second layer.