Patent ID: 8557626

Claim:
A method for forming an image sensor device, comprising: providing a photo sensor having a lens thereon; forming a first sacrificial element on the lens; forming an electromagnetic interference layer on the lens and the first sacrificial element; removing the first sacrificial element and the electromagnetic interference layer on the first sacrificial element to form an electromagnetic interference pattern having an opening exposing a selected portion of the lens; forming a second sacrificial element in the opening to cover a center region of the selected portion of the lens, while a peripheral region of the selected portion of the lens remains exposed; forming a light-shielding layer on the electromagnetic interference pattern, the second sacrificial element, and the peripheral region of the selected portion of the lens; and removing the second sacrificial element and the light-shielding layer on the second sacrificial element, to expose the center region of the selected portion of the lens to serve as a light transmitting region.