TV out chipsets
Many of the graphic cards sold today are equipped with a TV-out connector to display content on an ordinary television set.

 there are three major manufacturers: Chrontel, Philips and Conexant.

The circuitry involved in the TV out is usually encapsulated in a shielded metal box.  The chip set has to convert the graphics information that the video card receives into standard TV signals.  These are usually composite video or S-Video, which are significantly different video encoding from computer monitors such as EGA, VGA, or XVGA.

References

External links
tv-chip comparison (English)
grote TV-out FAQ (Dutch)

Chipsets
Graphics hardware