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Title:
CHARACTER DISPLAY CIRCUIT
Document Type and Number:
Japanese Patent JP3182299
Kind Code:
B2
Abstract:

PURPOSE: To display a character on a noise screen by inputting the noise component of an external video signal synchronously with the output timing of a background signal generated in a video signal generation means and overlapping it with a generated video signal to output them.
CONSTITUTION: The external video signal is inputted from an input terminal CVIN to an analog switch ASW 1 and an internally generated video signal is inputted to an analog switch ASW 2. Then, a video signal is outputted to an output terminal CVOUT by the ON/OFF-control of ASWS 1 and 2. The video signal is inputted from an external input terminal CVCR to an analog switch ASW 3, and an output control circuit 10 controls the ON/OFF of the analog switch ASW 3 by a control signal CTL 3, overlaps a noise signal with the video signal including a character signal generated in an OSD circuit and outputs them. Even if a picture signal does not exist in the external video signal, the character is not displayed in blue back but the character can be displayed on the noise screen.


Inventors:
Naito, Masayuki
Application Number:
JP1994000205447
Publication Date:
July 03, 2001
Filing Date:
August 30, 1994
Export Citation:
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Assignee:
SANYO ELECTRIC CO LTD
International Classes:
H04N5/21; H04N5/44; H04N7/025; H04N7/03; H04N7/035; (IPC1-7): H04N5/44
Attorney, Agent or Firm:
吉田 研二 (外2名)