A system for electrostatically measuring the shape or pattern of objects comprising an array of sensor devices having the capability of responding, due to variable electrostatic coupling, to produce differentiated output signals when a sensor element forming part of each device is present and when it is not. A transmitter frequency hopping sequence is provided that is derived from a set of available frequencies. The molten thermoplastic material is blended with the fibers to form a molten composite material having a concentration of fiber by weight. The pixel electrode is disposed so that all edges thereof overlap the gate bus line and source bus line. Through the use of the method and system in accordance with the present invention, the RTM function in a personal computer is updated in a manner that ensures that the update is authentic.