Patent ID: 7719590
Filing Date: 2010-05-18
Classification: H01L,H04N

Abstract:
1. A pixel sensor cell comprising: a photosensitive element for receiving incident light for a pixel; a capacitor device for storing charge, sad capacitor having first and second terminals; a capacitor coupling transistor device including a first terminal connected to said first terminal of said capacitor device and a second terminal connected to said photosensitive element, said capacitor coupling transistor device is biased so as to enable additional charge carriers to leak to said capacitor device via said capacitor coupling transistor device when a sufficient number of charge carriers have accumulated at said photosensitive element thereby extending a dynamic range of operation of said sensor cell; said cell further comprising: a transfer transistor device including a first terminal connected to said photosensitive element and enabled for transferring accumulated charge carriers from said photosensitive element and said capacitor device to a formed diffusion region for output thereof.