Patent ID: 7456913
Filing Date: 2008-11-25
Classification: G02F,H01L

Abstract:
1. An image display device provided with an active-matrix substrate comprising: an insulating substrate; and a plurality of circuit regions fabricated on said insulating substrate and including at least a pixel section and a pixel-driving circuit section, each of said pixel section and said pixel-driving circuit section having a polycrystalline silicon semiconductor film, wherein said plurality of circuit regions include thin film transistors having a lightly doped drain (LDD) structure; wherein at least one of said plurality of circuit regions has a first type of a thin film transistor and a second type of a thin film transistor, and an angular orientation of a direction of a current flowing through a channel of said first type of a thin film transistor is formed to be non-parallel with an angular orientation of a direction of a current flowing through a channel of said second type of a thin film transistor; wherein said plurality of circuit regions includes at least one pair of a first-type circuit region constituting a first circuit and a second-type circuit region constituting a second circuit, all thin film transistors in said first-type circuit region flow currents through channels thereof in one angular orientation, and angular orientations of currents flowing through channels of thin film transistors in said second-type circuit wherein, in said first-type circuit region, a peak-to-valley height difference of a surface of said channel, a source region and a drain region of said thin film transistors is equal to or smaller than 5 nm, and crystalline grains of said polycrystalline silicon semiconductor film are of a rectangular shape of 0.3 μm to 2 μm in width and 4 μm or more in length, and in said second-type circuit region, an average crystalline grain diameter is 1 μm or smaller and a peak-to-valley height difference of a surface is equal to or greater than 20 nm, in said channel, a source region and a drain region of said thin film transistors.