Circuit for displaying screen control states of a monitor

Details Circuit for displaying screen control states of a monitor Circuit for displaying screen control states of a monitor

1994-07-29

1996-02-20

Groody, James J.

Television

Basic receiver with additional function

For display of additional information

348634, 348637, H04N 324, H04N 5445

Patent

active

054933404

ABSTRACT:
A circuit for displaying on the screen a mode frequency and screen control states of a monitor by using OSD letters is disclosed. The circuit delays the R, G, B signals of the OSD IC for a predetermined time until the output signals from the pre-amplifier are completely blanked according to a blanking signal of the OSD IC, to prevent the data received from the video card from being displayed on the screen during displaying the OSD letters on the screen, connects a mixer at a post-stage of the pre-amplifier, and further applies the horizontal flyback signal derived from the horizontal retrace pulse of the monitor to the pre-amplifier so as to allow the OSD signal level of the OSD IC to have the same level as the video signal level of the pre-amplifier, thereby preventing the degradation of the input characteristics and the undesirable change of the colors.

REFERENCES:
patent: 5343249 (1994-08-01), Moon

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