Image sensor with optical guard rings and method for forming...

Details Image sensor with optical guard rings and method for forming... Image sensor with optical guard rings and method for forming...

2007-02-20

2007-02-20

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S208100, C257S432000

Reexamination Certificate

active

10983549

ABSTRACT:
An image sensor with optical guard rings is provided. The optical guard rings are embedded in a stacked inter-metal dielectric layer between the sensor areas, that is, around each pixel. The refraction index (RI) of the optical guard rings is smaller than that of the stacked inter-metal dielectric layer. Therefore, the incident light with a large angle of incidence is blocked by the optical guard rings and cannot arrive at the adjacent pixels.

REFERENCES:
patent: 5859450 (1999-01-01), Clark et al.
patent: 7012240 (2006-03-01), Yaung
patent: 2002/0149078 (2002-10-01), Hynecek
patent: 2005/0280007 (2005-12-01), Hsu et al.

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