Solid-state imaging device having plural hybrid pixels with dual storing function

摘要

A solid-state imaging device comprises a plurality of hybrid pixels. The hybrid pixel comprises a photodiode, which has a charge storage region and a photoelectric conversion region, and a transparent electrode. The transparent electrode applies a voltage to the charge storage region to modulate a potential with respect to a charge. Thereby the width of the charge storage region is reduced to form an effective charge storage region. Unless potentially modulated, the hybrid pixel functions as a normal pixel. Upon the potential modulation, the hybrid pixel functions as a phase detection pixel, which selectively stores the charge generated in a part of the photoelectric conversion region.

主权项

1. A solid-state imaging device comprising:
a plurality of hybrid pixels each comprising a photoelectric conversion region for photoelectrically converting incident light from a subject into a charge corresponding to an amount of the incident light, a charge storage region for storing the charge generated in the photoelectric conversion region, and a potential modulation electrode for applying a voltage to the charge storage region to modulate a potential with respect to the charge and thereby narrowing a width of the charge storage region to locally form the charge storage region, the hybrid pixel functioning as a normal pixel for evenly storing the charge generated in the photoelectric conversion region in a case where the width of the charge storage region is not narrowed, the hybrid pixel functioning as a phase detection pixel for selectively storing the charge generated in a part of the photoelectric conversion region in a case where the voltage is applied to the potential modulation electrode to narrow the width of the charge storage region, the hybrid pixel comprising two or more photodiodes, the each photodiode having the photoelectric conversion region and the charge storage region, an amount of a dopant being greater and the potential with respect to the charge being higher in an isolation region for interfering with charge transfer between the photodiodes than in an isolation region for interfering with charge transfer between the adjacent pixels.