Many displays that do HD these days will have a mini-DSub 15-pin VGA input which will allow you to connect most computers to it.
Depending on your video capability on your laptop, you will be able to either mirror or extend your desktop.
If your laptop has a DVI connector, you can get a DVI-HDMI adapter system to keep the signals pure digital but if your laptop has a D-Sub 15 RGB out, you're probably better off using the VGA connector on your TV rather than buying another device to do a A/D conversion.
All RGB signals are progressive except in rare situations or if you select an interlaced resolution from some video boards.
Connecting your computer to your TV should through the 15-pin VGA connector should also tell your computer the exact model and resolutions available via VESA signaling supported by most modern screens.
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