Patent ID: 7781719
Filing Date: 2010-08-24
Classification: H01L,H04N

Abstract:
1. A pixel structure, comprising: a photogate; and a photodiode, wherein an integration capacitance characteristic of the pixel structure is controlled by applying a constant bias voltage (V an integration capacitance of the pixel structure switches between a low value and a high value, thereby changing a sensitivity and a dynamic range of the pixel structure, the constant bias voltage V the photodiode is isolated from a defective field oxide border to reduce a dark current, the integration capacitance of the pixel structure in a first state is equal to an integration capacitance of the photodiode, the integration capacitance of the pixel structure in a second state is equal to a sum of the integration capacitance of the photodiode and an integration capacitance of the photogate, during the integration period, photo-generated majority carriers are collected at an integration node, decreasing a voltage (V when V