Graphics card in a TV?

I've got a 42" plasma screen by LG it has all the usual gubbins 2 HDMI ports 4 scart etc but it has a part/flap were I can install a graphics card into the TV at the rear. What are they used for are they any good and are they cheap to buy?
It will be a pay-per-view type card slot, because strictly speaking, it does not need a card as it already displays!
Unless it is a 'special' telly purchased with magic beans.

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