Fluorescent digital display tube drive circuit

The fluorescent display driving circuit is as shown in the figure. The display driving signal is input from the A, B, C and D terminals of IClpPB249D. ICI outputs the anode drive signal
of the character segment . When the cathode is working, it is heated by the filament to activate electrons . There is a grid between the cathode and the anode. When an anode and the grid are at a positive voltage relative to the cathode, the cathode Electrons will fly from the cathode to the anode. The eight anode segments are coated with phosphor , and the anode (segment) bombarded by electrons will emit light. This kind of display is characterized by high brightness,