Importance

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Abstract

A backlight system comprises a light-emitting panel (1) having a front wall (2) and, opposite thereto, a rear wall (3), and opposite first and second light-transmitting edge surfaces (4; 5) associated with a plurality of first and second light sources (6; 7). Light originating from the light sources (6; 7) is diffused in the panel (1). Parts of the surface areas (8; 9) of the rear wall (3) are provided with extraction means (18, 18', . . . ; 19, 19', . . . ) for extracting light from the panel (1). First extraction means (18, 18', . . . ) extract light from, preferably, the first light source (6), and vice versa In operation, said parts of the surface areas (8; 9) project light on a (LCD) display device panel (34) with an associated color filter (35). In the vicinity of the second edge area (5), the concentration of the first extraction means (18, 18', . . . ) is higher than that of the second extraction means (19, 19', . . . ), and vice versa. Preferably, the extraction means (18, 18', . . . , 19, 19', . . . ) are wedge-shaped, a side surface of the first extraction means (18, 18', . . . ) directed towards the second light source (7) extending parallel to the second edge surface (5), and vice versa. Preferably, the light sources (6; 7) comprise a plurality of blue, green, (amber) and red LEDs, each preferably having a luminous flux of at least 5 lumen.

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First Claim