One assignee leads the dataset with 1,445 records out of 4,591 in scope, far ahead of the fifth-ranked filer at 112 and tenth place at 46. The top five filers combined account for 52.5% of all records, and the top ten reach 59.2%. This concentration means most structural pixel claim space is already occupied by a small number of large semiconductor and image sensor manufacturers, so new filers typically need to differentiate on a specific technical mechanism rather than broad structural claims.

No, filing activity has declined from its peak. Annual filings rose to a peak of 311 in 2019, then fell to 168 by 2024, a 42% decrease across that three-year window using the most recent years unaffected by publication lag. Filings from 2025 onward are still incomplete in the record because publication typically trails filing by around 18 months, so those years should not yet be read as continuing decline or a rebound.

Deep trench isolation is a structural technique used to physically separate adjacent photodiodes, reducing crosstalk between pixels and improving quantum efficiency. It appears repeatedly in this dataset’s search terms and in representative filings, including geometric variants such as the four-quadrant square and Union Jack cross-section shapes described in a 2023 filing from Shanghai Huali Integrated Circuit Corporation. Isolation geometry is one of the more actively claimed sub-areas within the broader H01L semiconductor device classification.