Patent ID: 6545421
Filing Date: 2003-04-08
Classification: G09G,H01L

Abstract:
A current controlling element comprising:an actuator having a fixed portion, a vibrating portion supported on said fixed portion so as to undergo vibrations, and an actuating portion including a first and a second electrodes formed on at least one side of a deformable layer, said actuator generating a displacement motion by holding an offset electric potential of said first electrode at a desired value and variable-controlling an electric potential of said second electrode; a cathode formed on said actuator for emitting electrons; a plate for receiving said electrons emitted from said cathode; and at least one grid arranged between said cathode and said plate, wherein said current controlling element changes a position of said cathode with respect to said plate by said displacement motion of said actuator obtained by changing an electric potential difference of said second electrode to said offset electric potential, and adjusting the offset position of said cathode according to said offset electric potential, to adjust a control range of a current value taken out of said plate.