FIELD: physics.
SUBSTANCE: backlight has a solid transparent light guide (42) with a plurality of openings in the bottom surface of the light guide, each opening containing a side-emitting LED (10). Prisms or other optical elements (44, 48) are formed in the top wall of each opening to reflect light in the light guide towards a light output surface of the light guide so that the side-emitting LEDs do not appear as dark spots at the output of the backlight. To avoid any direct emission from the sides of the LED towards the output surface of the light guide appearing as bright areas, optical elements (80, 88, 94, 97) are formed at the edges of the openings or in the output surface of the light guide so that direct emission light is not output from the light guide. Substantially identical cells may be formed in the light guide using cellular walls (61, 72) around one or more LEDs.
EFFECT: high uniformity of brightness.
7 cl, 20 dwg
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