H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 7/00 (2006.01) G09G 3/22 (2006.01) H01J 29/98 (2006.01)
Patent
CA 2183824
In order to prevent voltage drops across the wiring resistances in a multi-electron source having a plurality of electron emitters wired in the form of a matrix through a plurality of data wiring layers and a plurality of scanning wiring layers, a constant current signal is output to each data wiring layer. At this time, each non-selected data wiring layer tends to be set at a high impedance selected and vary in potential, resulting in an abnormal turn-on operation or an electron orbit shift. A driving circuit for solving this problem is provided. A switch for switching a constant current output unit for outputting a constant current regardless of the impedance of a signal output destination, and a constant voltage output unit for outputting a constant voltage regardless of the impedance of a signal output destination is connected to each data wiring layer. For example, a constant-current circuit (17) as a current output unit always outputs the same current (I1 to In) to a switch (30). A pulse width signal (PW1 to PWn) from a pulse-width modulation circuit (7) serves to switch the mode of outputting a current (I1 to In) to a data wiring layer (Dy1 to Dyn) and the mode of fixing a data wiring layer to voltage GND.
Oguchi Takahiro
Sakai Kunihiro
Sakuragi Takamasa
Suzuki Hidetoshi
Todokoro Yasuyuki
Canon Kabushiki Kaisha
Ridout & Maybee Llp
LandOfFree
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