Editing Backlight (section)

==Diffusers==
For a non-ELP backlight to produce even lighting, which is critical for displays, the light is first passed through a lightguide (Light guide plate, LGP) - a specially designed layer of [[plastic]] that [[Photon diffusion|diffuses]] the light through a series of unevenly spaced bumps. The density of bumps increases further away from the light source according to a [[diffusion equation]]. The diffused light then travels to either side of the diffuser; the front faces the actual LCD panel, the back has a [[mirror|reflector]] to guide otherwise wasted light back toward the LCD panel. The reflector is sometimes made of [[aluminum foil]] or a simple white-pigmented surface.