There are provided a method and an apparatus of forming an insulating layer including silicon oxynitride. The first reference member is arranged at an unused area of the first transparent plate, the unused area being an area which is within the original sheet placeable area on the first transparent plate and is not covered with original sheets of a plurality of predetermined different sizes placed on the first transparent plate with being positioned with respect to a predetermined positioning point. The invention also includes a roller conveying system that has a plurality of the spaced-apart cylindrical rollers, driven by a plurality of a circular drive belt, and a nip guard system having a plurality of nip guard means that guard the nips andor sides of the revolving drive belts. If the ambient temperature is changed, the number of boosting stages of the boosting unit is reset in the procedure so that the consumed current of the whole liquid crystal display device can be optimized. Additional methods are provided. A method of communication between a radio frequency identification tag, preferably secured to a business form, and a digitizing tablet.