| 摘要 |
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. |
