Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Patent
1995-12-05
1999-01-12
Brier, Jeffery
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
345115, 348497, G09G 500
Patent
active
058596348
ABSTRACT:
A first information (I) is displayed on a display screen of a display device (5). A vertical and horizontal position of a field of the first information (I) on the display screen is determined by a vertical start pulse (V) and by horizontal start pulses (H), both corresponding to or being extracted from the first information (I). The vertical position of a second information (Oi) on the display screen is determined by counting a certain number of the horizontal start pulses (H). To eliminate any remaining jitter, a time difference (Td) is determined between the active edge of the vertical start pulse (V) and that horizontal start pulse (H) which is nearest to the active edge of the vertical start pulse (V). If this time difference (Td) is smaller than a certain safe margin (Ni), the nearest horizontal start pulse (H) is so close to the active edge of the vertical start pulse (V), that an occurrence of vertical jitter is becoming likely. To avoid a dangerous vertical jitter situation, in a next field, the active edge of the vertical start pulse (V) is shifted in time over a shift period (Di), to obtain sufficient distance between the active edge of the vertical start pulse (V) and the nearest horizontal pulse (H).
REFERENCES:
patent: 4677484 (1987-06-01), Pitsch et al.
patent: 5608425 (1997-03-01), Movshovich
Chen Chi-Tien
Ou Hsien C.
Van Veldhuizen Evert D.
Brier Jeffery
Goodman Edward W.
U.S. Philips Corporation
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