BACKGROUND HIGHLIGHT DEVICE Russian patent published in 2008 - IPC G02F1/133 F21V7/04 

FIELD: highlighting of liquid crystal panels.

SUBSTANCE: background highlight device has high-divergence light source, optical-wave guide plate, light leading out aid and optical member intended for introduction of radiation in light wave-guiding plate. Optical member is disposed between light source and light-wave guide plate. The latter has upper and lower surfaces. Optical member produced of transparent optical material with symmetry has two side surfaces. Side surfaces adjoin exit surface. Entrance surface is made in form of two protrusions. Internal surfaces adjoin one another at angle. External face of any protrusion adjoins corresponding side surface at angle. Light source is placed between protrusions of entrance surface of optical member. Any internal surface f of entrance surface is made for guide of light from source inside member onto its external face and side surface, which both provide total internal reflection of light onto exit surface and side surface of optical member.

EFFECT: improved uniformity of brightness at exit; higher light efficiency.

11 cl, 4 dwg