What is the difference between LCD and bar graph display?

Answer 1

LCD stands for Liquid Crystal Display in which each segment that turns on actually turns black when electricty is applied to that segment. When the power is applied to it the liquid polarizes lining up the molecules and actually blocking the light going through it which is why you would need a light source behind it to see it operate. When the power is turned off to that segment the liquid unpolarizes and lets light through and has the illusion of disappearing. On the other hand the bar graph display operates on a different principle by using LEDS (Light Emitting Diodes) which may be arranged as a row of rectangles is actually a type of semiconductor similar to a transistor. When power is applied to a LED the phosphor in the substrate gives off light. An LCD display can also be shown as a bar graph but each segment will appear black as each segment is activated.