A method of forming a gate dielectric includes the steps of forming a gate oxide layer on a substrate, forming a buffer layer over the gate oxide layer and incorporating nitrogen into the gate oxide layer through the buffer layer. A conductor layer includes a video signal line, a drain electrode, a source electrode, and a connecting line. The anchor portion has a minimum length defined by 2. Normally, the control unit changes the mode of operation of the reader from a first mode, wherein the reader does not operate to decode or recognize image data to a second mode, wherein the reader operates to decode andor recognize image data.