Definition – What does LCD mean?
Liquid Crystal Display (LCD) is a flat panel display technology that is commonly used in computer monitors and televisions. The technology is also used in mobile devices such as smartphones and tablets. Just like LED (Light-emitting diode) and gas-plasma technology, it also allows displays to be much thinner than cathode ray tube technology. The major difference is that LCD consumes less power than LED because it works in the principle of blocking light rather than emitting it.
Glossary Web explains LCD
The backlight in LCD provides an even light source behind the screen, and this light is polarized that means only half of the light shines through to the liquid crystal layer. The liquid crystals are made up of a part solid and the part liquid substance that can be twisted by applying an electrical voltage to them. It blocks the polarized light when it is turned off, but reflect red, green and blue light when ON.
All the LCD screen contains a matrix of pixels that display the image on the screen. Early LCDs had a passive matrix screen that controlled individual pixels by sending a charge to their column and row. A limited number of electric charge cloud be sent each second, and the passive-matrix screen was known for appearing blurry when the image moves rapidly on the screen. Latest LCDs use active-matrix technology that contains film transistors, and these transistors include capacitors that enable individual pixels to retain their charge actively.