three colours or may simultaneously energize leds of all the colours and terminate power to the leds simultaneously the light guide 328 may have a tapered block construction and may have approximately a trapezoidal form to more evenly distribute the light into the lcd the light guide may also have uneven areas 332 that scatter the light so as to avoid shadowing effects in the lcd image although uneven area 332 is shown to project inward to the surface of the light guide 328 the uneven areas may be arranged differently so long as the arrangement effectively scatters the light from the leds 322 324 326 the uneven areas may be abraded molded corrugated chemically etched or the like preferably to maximize the utilization of light the leds 322 324 326 and the light guide 328 are partially enclosed by a reflector such that the only opening is fully bounded by the light transmissive area of the lcd fig4 illustrates an exemplary embodiment of a light guide and a compensation sheet the left image of fig4 shows hot spots as seen from the lcd side of the light guide the hot spot image may be captured directly from the light guide when the light guide is illuminated from its light source or may be captured through a filter a mask is formed from the captured image in a pattern that mirrors the pattern of light from an illuminated light guide the mask shown in the centre image of fig4 may be a sheet or film with apertures the hot spot filter may be a transparent sheeting with printing or coating in select areas corresponding to the hot spots.