Color monitor

Improved color monitor, comprising:

• a cathode-ray tube for generating a single electron beam with different energy levels depending on the primary color to be displayed, said cathode-ray tube including a cathode, a cylindrical portion, a bulb which frontally defines a screen, a conducting layer inside the bulb defining an anode and a graphite layer outside said bulb, said anode and said graphite layer defining therebetween a capacitor charged to voltages which differ in value according to the color to be displayed;
• at least one layer of electroluminescent material at said screen;
• a control circuit for controlling the sequential display of said primary colors;
• means adapted to vary the voltage applied to the cathode and/or the grid of said cathode-ray tube so as to generate an overcurrent in said capacitor and to cause its rapid discharge at the end of the display of the color signal with higher energy;
• and
• means adapted to increase the deflection of the electron beam before and/or after flyback to the beginning of a new half-period in such a way as to cause said electron beam to strike the anode in a position which is not visible on said screen of said cathode-ray tube.

Improved color monitor, comprising:

• a cathode-ray tube for generating a single electron beam with different energy levels depending on the primary color to be displayed, said cathode-ray tube including a cathode, a cylindrical portion, a bulb which frontally defines a screen, a conducting layer inside the bulb defining an anode and a graphite layer outside said bulb, said anode and said graphite layer defining therebetween a capacitor charged to voltages which differ in value according to the color to be displayed;
• at least one layer of electroluminescent material at said screen;
• a control circuit for controlling the sequential display of said primary colors, said control circuit including:
• a phase delay section having an input, said phase delay section receiving at said input vertical synchronization pulses and being adapted to generate a delayed phase signal which has a delay substantially corresponding to the length of the useful signal, a circuit for controlling the duration of the flyback of the electron beam connected to said delayed phase signal and adapted to actuate the rapid flyback of the electron beam at the end of a complete scan of the screen, a color signal generator adapted to generate a signal which encodes the color signal to be displayed, and a high anode voltage generator connected to said color signal generator;
• and
• means adapted to vary the voltage applied to the cathode and/or the grid of said cathode-ray tube so as to generate an overcurrent in said capacitor and to cause its rapid discharge at the end of the display of the color signal with higher energy, wherein said means includes a saturation control circuit adapted to control the generation of the overcurrent in the capacitor at the end of the flyback of the electron beam.