The concept and development of LCD TVs can be traced back to the growth and success of LCD computer monitors. Thus, LCD TVs do have a lot in common with these monitors. Majority of LCD TVs have VGA (video graphics array) connections and therefore they can also be used as computer monitors.
Features of an LCD TV like built-in analog or HDTV tuner, analog AV and HDMI inputs, and those required for TV-like performance will not be needed if you intend to use the LCD mainly as a computer monitor. The extra cost of these features is something that you will have to consider during purchase.
Moreover, if you are a gamer or have integrated your PC with your home theater system, and want to use the largest monitor, the best deal would be a 30-inch LCD TV.
Thus, if you want to use your LCD TV as a television as well as a computer monitor, you need to ensure that the unit has VGA or other connection features that will enable PC use.