Image sensor array with reduced pixel crosstalk

US6720594B2 · kind B2 · utility

Assignee

• Xerox Corporation · US

Inventors

• Jeffrey T. Rahn · Mountain View, US
• Koenraad Van Schuylenbergh · Mountain View, US
• Jeng Ping Lu · San Jose, US

Key dates

• Filing date: Jan 7, 2002
• Grant date: Apr 13, 2004
• Expiry date: Jan 7, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10F30/2235

Abstract

Improved pixel circuits are disclosed for high fill-factor large area imager systems using continuous (e.g., amorphous silicon) sensor layers. A first approach prevents crosstalk by ensuring that each pixel is not able to go into saturation. A second approach employs a cascode transistor to maintain the bias of the sensor contact at a constant potential regardless of illumination condition. These two approaches may be combined. A resistive film connecting the pixel contacts may be used in conjunction with the second approach to prevent aliasing of signal and noise.