An LCD consists of many components

A typical LCD uses a cold-cathode fluorescent tube or multiple lcd modules. Two types of custom lcd display are used: (1) that which emits short wavelength emission, which is converted to longer wavelengths by means of a fluorescent material (downconversion) and (2) that which emits the three color primaries . Thus the light source for an LCD is either linear or point, so the light must be converted to the area form to be used as a backlight unit. The light reflected by the reflector passes through the light guide and is diffused. A light guide is made of high refractive index material, such as an acrylic polymer, which delivers the light by total internal reflection due to the refractive index difference between it and the surrounding air. The light guide structure is designed such that uniform luminance distribution across the area of the display can be achieved.