Patent ID: 6028574
Filing Date: 2000-02-22
Classification: G09G

Abstract:
A flat display screen comprising:a cathode (1);an anode (5) including at least two groups of alternate conductive strips (9), said alternate conductive strips supporting phosphors (7); and,a control circuit adapted to sequentially address each of said groups, and including means for applying, at least temporarily, to each group of conductive strips (9) a quiescent voltage (V.sub.Al) lower than the minimum cathode voltage, said means for applying being adapted for switching between a positive anode voltage (V.sub.Ah) and said quiescent voltage (V.sub.Al) and comprising:first and second MOS transistors (MP, MN) having respective gates adapted to receive suitable control signals;a drain of said first transistor (MP) forming an output terminal (20) connected through a first resistor (R.sub.1) to a group of phosphor supporting strips;a source of said first transistor (MP) being connected to said positive anode voltage (V.sub.Ah); and,said gate of said first transistor (MP) being connected, through a first Zener diode (D.sub.Z1) connected in parallel with a second resistor (R.sub.2) to said positive addressing voltage (V.sub.Ah ) and, through a third resistor (R.sub.3) connected in series with a first capacitor (C.sub.1), to a first control terminal (21) adapted to receive a two-state signal (C.sub.P).