Patent ID: 6713748
Filing Date: 2004-03-30
Classification: H01L

Abstract:
An image detection device comprising:a signal line and scanning line which run perpendicularly to each other on a substrate; a pixel portion arranged at an intersection of said signal line and scanning line and including a photoelectric conversion film for converting incident light into a signal charge to accumulate the signal charge and a pixel electrode; a signal detective circuit including thin film transistors controlled in operation by said scanning line to read out a potential of the pixel electrode; and a scanning line driving circuit for driving said scanning line, wherein a thin film transistor having a source or drain connected to the pixel electrode out of the thin film transistors included in said signal detective circuit has an LDD structure on a high-potential side solely, wherein pluralities of signal lines and scanning lines run on the substrate, pixel portions are arranged in a matrix at intersections of said signal lines and scanning lines, said signal detective circuit includes thin film transistors controlled in operation by the respective scanning lines to read out potentials of corresponding pixel electrodes, and at least one thin film transistor having a source or drain connected to said pixel electrode out of the thin film transistors included in said signal detective circuit has an LDD structure on a high-potential side, wherein said signal detective circuit comprises: a signal read transistor which has a drain or source connected to the pixel electrode, a source or drain connected to said signal line, and a gate connected to said scanning line, and is controlled in operation by said scanning line to output the potential of the pixel electrode to said signal line; and a protective transistor which has a drain or source and a gate connected to the pixel electrode, and a source or drain connected to a predetermined potential line, and connects the pixel electrode to the predetermined potential line when the potential of the pixel electrode reaches not less than a predetermined potential, said signal read transistor having an LDD structure on a high-potential side, and said protective transistor having an LDD structure on at least a high-potential side.