Display apparatus

Details Display apparatus Display apparatus

1995-10-11

1997-08-12

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

G09G 104, H01J 2958

Patent

active

056568959

ABSTRACT:
In a display apparatus, the focus shift and astigmatism of the electron beams in the CRT and its vicinity portion are reduced. Picture scenes of higher fidelity and higher acuteness and higher resolution are obtained. In an electron beam focusing controller circuit contained therein, signals corresponding to a high-pass component and a luminance component in the image signals from a horizontal direction electron beam focusing determination circuit, and signals corresponding to a low-pass component in the image signals from a vertical direction electron beam focusing determination circuit are combined. The combined signals are processed by a driving voltage generator and supplied to an auxiliary acceleration focusing electrode of a CRT.

REFERENCES:
patent: 4319163 (1982-03-01), Chen
patent: 4558253 (1985-12-01), Bechis et al.
patent: 4587464 (1986-05-01), Ho et al.
patent: 4916365 (1990-04-01), Arai

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