Display apparatus capable of image display for video signals of

Details Display apparatus capable of image display for video signals of Display apparatus capable of image display for video signals of

1996-05-23

1999-07-20

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

G09G 500

Patent

active

059261749

ABSTRACT:
In an apparatus for displaying the image of an input video signal, utilizing a clock signal which is phase synchronized with the input video signal, change in the state of the input video signal is made easily detectable. For this purpose there is disclosed a display apparatus provided with a clock generating circuit including a PLL circuit and adapted to generate a clock signal which is phase synchronized with the input video signal, and a display circuit for displaying the image relating to the input video signal utilizing the clock signal generated by the clock generating circuit. A detection circuit detects the state of the input video signal according to whether the PLL circuit is in the locked state.

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patent: 4996596 (1991-02-01), Hirao et al.
patent: 5528307 (1996-06-01), Owada et al.
patent: 5589801 (1996-12-01), Yamamura et al.
patent: 5627596 (1997-05-01), Shiramizu

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