Flat screen TVs are usually made from either LCD or plasma screens. Aside from the technological differences between LCDs plasma TVs, LCD TVs generally have smaller screen sizes than plasma TVs. For example, LCD TVs usually have screen sizes ranging from 7 inches to around 42 inches (although new technological advances are allowing for much larger LCD TVs). Plasma TVs screens usually start at around 42 inches can go up from there. When shopping for a mount, it is important to check the size weight of your flat screen TV. You want to make sure that the mount you purchase can support the size weight of your TV.