What Are LCD And EL Display?

ANS: Liquid Crystal Display (LCD):

          The LCD uses a clear liquid chemical trapped in tiny pockets between two pieces of glass. Each pocket of liquid is covered both front and back by very thin wire. When a small amount of current is applied to both wires, a chemical reaction turns the chemicals a dark-colours—thereby blocking light. The point of blocked light is the pixel.
The principal advantages of LCD are:
1. Low power consumption.
2. Low cost.
3. Small size.
The biggest disadvantages are:
1. LCD do not emit light; as a result, the image has very little contrast.
2. The screen is very susceptible to glare, so the optimum viewing angle is very narrow.
3. The resolution is not as good as that of the CRT.