IMAGE SENSORS WITH HIGH DYNAMIC RANGE AND AUTOFOCUSING HEXAGONAL PIXELS

• US 20180301484A1
• Filed: 04/17/2017
• Published: 10/18/2018
• Est. Priority Date: 04/17/2017
• Status: Abandoned Application

• Current Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Original Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Inventors: VAARTSTRA, Brian Anthony, CHAPMAN, Nathan Wayne
• Application Number:
  US15/488,646
• Publication Number:
  US 20180301484A1
• Time in Patent Office: Days
• CPC Class Codes: H01L 27/14607 Geometry of the photosensitive area
• CPC Class Codes: H01L 27/14621 Colour filter arrangements
• CPC Class Codes: H01L 27/14627 Microlenses
• CPC Class Codes: H01L 27/1463 Pixel isolation structures
• CPC Class Codes: H01L 27/14645 Colour imagers

Abstract

An image sensor may include phase detecting and autofocusing (PDAF) pixels. Each PDAF pixel may be hexagonal may be divided into two or more photodiode regions. A semi-spherical microlens may be formed over each PDAF pixel. Each PDAF pixel may be further divided into an inner sub-pixel portion and an outer sub-pixel portion to provide high dynamic range (HDR) functionality. The outer sub-pixel portion may be further divided into two or more photodiode regions to provide depth sensing capability. A semi-toroidal microlens may be formed over each PDAF HDR pixel. Each PDAF HDR pixel may also have a snowflake-like shape or some irregular shape. Smaller interstitial pixels may be dispersed among the larger snowflake-like pixels.

Claims

1. An image sensor comprising:

a non-rectangular pixel that comprises a first photosensitive region and a second photosensitive region;

a deep trench isolation structure interposed between the first photosensitive region and the second photosensitive region; and

a microlens that covers the first photosensitive region and the second photosensitive region.

2. The image sensor of claim 1, wherein the non-rectangular pixel is hexagonal.

3. The image sensor of claim 1, wherein the first photosensitive region and the second photosensitive region have the same size.

4. The image sensor of claim 1, wherein the non-rectangular pixel further comprises a third photosensitive region that is covered by the microlens.

5. The image sensor of claim 4, wherein the non-rectangular pixel further comprises a fourth photosensitive region that is covered by the microlens.

6. The image sensor of claim 5, wherein the non-rectangular pixel further comprises fifth and sixth photosensitive regions that are covered by the microlens.

7. The image sensor of claim 6, further comprising:

a deep trench isolation structure separating the six photosensitive regions.

9. The image sensor of claim 1, further comprising:

a color filter element formed over the non-rectangular pixel; and

a color filter housing structure that surrounds the color filter element.

8. (canceled)

10. An image sensor comprising:

a non-rectangular pixel that comprises;

an inner sub-pixel; and

an outer sub-pixel that surrounds the inner sub-pixel.

11. The image sensor of claim 10, wherein the non-rectangular pixel is hexagonal.

12. The image sensor of claim 10, wherein the inner sub-pixel is hexagonal.

13. The image sensor of claim 10, wherein the inner sub-pixel is circular.

14. The image sensor of claim 10, wherein the outer sub-pixel completely surrounds the inner sub-pixel.

15. The image sensor of claim 10, further comprising:

a semi-toroidal microlens covering the non-rectangular pixel.

16. The image sensor of claim 10, wherein the outer sub-pixel is divided into multiple photodiode regions.

17. The image sensor of claim 16, wherein the inner sub-pixel is divided into multiple photodiode regions.

18. The image sensor of claim 10, wherein the inner sub-pixel is divided into multiple photodiode regions.

19. An electronic device comprising:

a camera module having an image sensor, the image sensor comprising;

an array of non-rectangular image sensor pixels, each of which is configured to support phase detection and high dynamic range operations.

20. The electronic device of claim 19, wherein each of the non-rectangular image sensor pixels in the array is hexagonal.

21. The electronic device of claim 19, wherein each of the non-rectangular image sensor pixels in the array is divided into a plurality of photodiode regions.

22. The electronic device of claim 19, wherein each of the non-rectangular image sensor pixels in the array comprises an inner sub-pixel portion and an outer sub-pixel portion that surrounds the inner sub-pixel portion.

23. The electronic device of claim 22, wherein the outer sub-pixel portion in each of the non-rectangular image sensor pixels is divided into a plurality of photosensitive regions.

24. The electronic device of claim 19, wherein each of the non-rectangular image sensor pixels in the array comprises a first sub-pixel of a first size and a second sub-pixel of a second size that is greater than the first size.