Electronic device including optical sensing element

Patent metadata

Field	Value
Publication number	US-12019254-B2
Application number	US-202218147078-A
Country	US
Kind code	B2
Filing date	Dec 28, 2022
Priority date	Jan 26, 2022
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

An electronic device is provided. The electronic device includes a substrate, an optical sensing element, a light-shielding structure, and a microlens. The substrate has a normal direction. The optical sensing element is disposed on the substrate. The light-shielding structure is disposed on the optical sensing element and includes a plurality of light-shielding layers. Each light-shielding layer includes an opening, and centers of the openings are arranged along a first direction and separated from each other. The microlens is disposed on the light-shielding layers and overlaps the opening of the uppermost light-shielding layer. The microlens guides light into an optical channel formed by the openings, so that the optical sensing element has a maximum response value for light with an incident angle that is greater than or equal to 10 degrees and less than or equal to 30 degrees relative to the normal direction.

First claim

What is claimed is:

1. An electronic device, comprising:
a substrate having a normal direction;
an optical sensing element disposed on the substrate;
a light-shielding structure disposed on the optical sensing element, comprising:
a first light-shielding layer;
a second light-shielding layer disposed on the first light-shielding layer; and
a third light-shielding layer disposed on the second light-shielding layer,
wherein the first light-shielding layer comprises a first opening, the second light-shielding layer comprises a second opening, the third light-shielding layer comprises a third opening, and in a top-view diagram, centers of the first opening, the second opening and the third opening are separated from each other along a first direction, and the first direction is a line connecting a center of the first opening and a center of the third opening; and
a microlens disposed on the plurality of light-shielding layers and overlapping the opening of the uppermost light-shielding layer;
wherein the microlens guides light into an optical channel formed by the plurality of openings, so that the optical sensing element has a maximum response value for light with an incident angle that is greater than or equal to 10 degrees and less than or equal to 30 degrees relative to the normal direction.

2. The electronic device as claimed in claim 1 , wherein the light-shielding structure and the microlens are configured such that a field of view of the optical sensing element is greater than or equal to 10 degrees and less than or equal to 30 degrees.

3. The electronic device as claimed in claim 1 , wherein the center of the first opening and the center of the third opening are separated from each other by a distance, and the distance is greater than or equal to 4 micrometers and less than or equal to 8 micrometers.

4. The electronic device as claimed in claim 1 , wherein the center of the second opening and the center of the third opening are separated from each other by a distance, and the distance is greater than 0 micrometers and less than or equal to 6 micrometers.

5. The electronic device as claimed in claim 1 , wherein a width of the first opening is less than or equal to 6 micrometers.

6. The electronic device as claimed in claim 1 , wherein a width of the second opening is less than or equal to 10 micrometers.

7. The electronic device as claimed in claim 1 , wherein a width of the third opening is less than or equal to 18 micrometers.

8. The electronic device as claimed in claim 1 , wherein a size of the third opening is larger than a size of the second opening, and the size of the second opening is larger than a size of the first opening.

9. The electronic device as claimed in claim 1 , wherein the first opening does not overlap the second opening in the normal direction.

10. The electronic device as claimed in claim 1 , wherein the first opening does not overlap the third opening in the normal direction.

11. The electronic device as claimed in claim 1 , wherein in a top-view diagram of the electronic device, a geometric center of the microlens overlaps a center of the third opening.

12. The electronic device as claimed in claim 1 , further comprising a dielectric structure disposed on the optical sensing element.

13. The electronic device as claimed in claim 12 , wherein the dielectric structure further comprises a first dielectric layer and a second dielectric layer, wherein the first dielectric layer is disposed between the first light-shielding layer and the second light-shielding layer, and the second dielectric layer is disposed between the second light-shielding layer and the third light-shielding layer.

14. The electronic device as claimed in claim 13 , wherein the first dielectric layer and the second light-shielding layer have a thickness, and the thickness is greater than or equal to 5 micrometers and less than or equal to 15 micrometers.

15. The electronic device as claimed in claim 13 , wherein the second dielectric layer and the third light-shielding layer have a thickness, and the thickness is greater than or equal to 5 micrometers and less than or equal to 15 micrometers.

16. The electronic device as claimed in claim 1 , further comprising a display panel disposed on the microlens, wherein the display panel has a display area, and a second direction is defined as the direction from a lower side of the display area to an upper side of the display area, and wherein in a top-view diagram of the display panel, an included angle between the first direction and the second direction is greater than 0 degrees and less than 180 degrees.

17. The electronic device as claimed in claim 16 , wherein in the top-view diagram of the display panel, the first direction forms an acute angle with respect to the second direction.

18. The electronic device as claimed in claim 1 , wherein the first direction is a direction in which the optical sensing element absorbs light.

Assignees

• Innolux Corp

Inventors

• Lee Te-Yu
• Liu Yu-Tsung
• Liao Wei-Ju
• Lin Po-Hsin
• Lin Chao-Yin

Classifications

• H10F39/18

  Complementary metal-oxide-semiconductor [CMOS] image sensors; Photodiode array image sensors · CPC title

• H10F39/8063

  Microlenses · CPC title

• H10F39/8037

  the integrated elements comprising a transistor · CPC title

• H10F39/8057 Primary

  Optical shielding · CPC title

• G06V40/1318

  using electro-optical elements or layers, e.g. electroluminescent sensing · CPC title