Driving circuit for a display having a multi-electron source

摘要

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 of a plurality of data wiring layer electrodes and a plurality of scanning wiring layer electrodes, a constant current signal is output to each data wiring layer electrode. At this time, each non-selected data wiring layer electrode tends to be set at a high impedance 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 electrode. 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 electrode (Dy1 to Dyn,) and the mode of fixing a data wiring layer electrode to voltage GND. <IMAGE>