Color display system

Details Color display system Color display system

1988-12-20

1989-09-26

Griffin, Robert L.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313105CM, 313534, H01J 4300

Patent

active

048703281

ABSTRACT:
A color display system including a cathode ray display tube (10) of the kind which has an electron multiplier (16) arranged adjacent a luminescent screen (14) comprising a repeating pattern of three different color phosphor elements and pairs of color selection electrodes (38, 40) associated with each channel of the multiplier operable to control the direction of the electron beam from the channels for color selection purposes uses a switching bridge circuit comprising semiconductor switching device (52, 54, 56, 58), e.g. MOSFETs, connected between voltage supplies for switching the voltage applied to each one of the pair of electrodes between three respective levels in synchronism to achieve a predetermined color selection sequence. The semiconductor devices are controlled by synchronized waveforms from a pulse generating circuit (86) via optocouplers (88) enabling the switching bridge circuit to be floated at a high potential. The switching voltages applied to one of the selection electrodes may be offset with respect to those applied to the other electrode.

REFERENCES:
patent: 2821637 (1958-01-01), Roberts et al.
patent: 4467224 (1984-08-01), Maddox
patent: 4560898 (1985-12-01), Knapp et al.
patent: 4667134 (1987-05-01), Terry

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