Patent ID: 8681290

Claim:
A backlight module for implementation in a display assembly and for illuminating a display panel of the display assembly, said backlight module comprising: a light source, the light source being configured for emitting a plurality of light beams including a first light beam and a second light beam; a light guide, the light guide being configured for receiving the first light beam, the first light beam having an angle of incidence being generally perpendicular to an insertion edge of the light guide, the light guide being further configured for providing the first light beam to the display panel for illuminating the display assembly; an optical filter, the optical filter configured for changing a power spectral distribution of the plurality of light beams prior to insertion of the first light beam into the light guide, the optical filter in contact with the light source; and at least one optical element, the at least one optical element being located between the optical filter and an insertion edge of the light guide, the at least one optical element comprising a prism element, wherein said prism element is configured for allowing the first light beam to pass through the prism element to the light guide, said prism element being further configured for back reflecting the second light beam towards the light source such that the second light beam is mostly lost, the second light beam having an angle of incidence being generally non-perpendicular to the insertion edge of the light guide.