Flat cathode ray tube display apparatus

Details Flat cathode ray tube display apparatus Flat cathode ray tube display apparatus

1988-10-25

1989-10-10

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313422, H01J 2970, H01J 2972

Patent

active

048734721

ABSTRACT:
In a flat cathode ray tube display apparatus a line scanning, low energy, electron beam (18) is directed substantially parallel to a faceplate (12) carrying a phosphor screen (14) in a space between a deflection electrode array (22) and an input side of an electron multiplier (16) adjacent the screen where it is deflected by the electrode array (22) in field scan manner towards the screen. The deflector electrodes (23) in the array correspond in number to the conventional raster lines to be displayed and are switched successively between two voltage levels to step the line scanning beam. The electrodes' voltage switching drive circuit (52) may be carried on a substrate adjacent the electrodes thereby reducing the number of leadthroughs in the tube's envelope (15). For color display the screen comprises a pattern of different color phosphor elements and a color selection electrode arrangement (38) is situated at the output side of the multiplier (16). Three differently colored, and accurately superimposed, lines are drawn on the screen in a normal line scan period between stepping of the beam.

REFERENCES:
patent: 4542322 (1985-09-01), Irie et al.
patent: 4667134 (1987-05-01), Terry
patent: 4703231 (1987-10-01), Tomii et al.

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