The most widely used information display device to date has been the cathode ray tube (CRT) TV. Recently, LCDs have been rapidly gaining popularity. LCDs are extremely versatile because they can be used not only in TVs, but also in cellular phones, mobile devices, notebook computers, game consoles, digital cameras, car navigation systems and other devices. CRTs and LCDs may resemble each other in appearance and how they work, but their structures and principles differ. Let's take a look at how they work.