Picture display apparatus and method of generating a focusing vo

Details Picture display apparatus and method of generating a focusing vo Picture display apparatus and method of generating a focusing vo

1997-06-05

1999-07-13

Peng, John K.

Television

Video display

Cathode-ray tube

348805, 348745, 31536818, 315382, H04N 322, H04N 928

Patent

active

059233877

ABSTRACT:
A focusing waveform (Vf) is obtained by first generating (2) two intersecting triangular waveforms of opposite phase and half the deflection frequency. Subsequently, the difference between these two triangular waveforms is multiplied by itself for generating a second-order parabolic waveform at the deflection frequency, at which the parabolic waveform has a lower side which is located at zero and is not disturbed by DC offsets. In an advantageous embodiment of the invention, which is eminently suitable for multimedia applications, the focusing waveform has the correct form and amplitude, independent of the deflection frequency.

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patent: 4961030 (1990-10-01), Ogino et al.
patent: 5583581 (1996-12-01), Adachi et al.
patent: 5780978 (1998-07-01), Bang
patent: 5847777 (1998-12-01), George

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