I think you friend is correct. An LCD/TV monitor is a normal monitor with additional television circuitry added (you need a TV licence to use it!). I recently bought a Sony Liquid Crystal Display (LCD) monitor, & am very pleased with it. I wouldn't dream of willingly going back to a conventional CRT monitor.
Besides giving very vivid colours & having flat screens, LCD's are much slimmer (depth), use a lot less electricity and thus a lot less heat.