Flat display device

Details Flat display device Flat display device

1989-02-06

1990-05-22

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315371, H01J 2970, H01J 2956

Patent

active

049280414

ABSTRACT:
The invention relates to a flat display device with a faceplate (1) having either an outward curvature or bulging inwards under the action of atmospheric pressure, the device also comprising a planar deflection device (8) to deflect the electron beams (13, 14) in each line. With a view to obtaining a pure-color image, the deflection voltages are corrected according to the particular distance between the deflection device (8) and the faceplate (1), thereby ensuring that the electron beams (13, 14) will impinge only on the appropriate equidistant phosphor dots or strips (4). The formula for calculating the correction factor (K) is stated.

REFERENCES:
patent: 3435278 (1969-03-01), Carlock et al.
Koelsch, CRT Pin Cushioning Correction Circuit, IBM Technical Disclosure Bulletin, vol. 5, No. 10, Mar. 1963, pp. 44-47.

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