| 摘要 |
PURPOSE:To provide a backlight unit such as a liquid crystal display panel improved in luminance uniformity by lessening luminance dispersion right over both ends of a U-shaped fluorescent lamp. CONSTITUTION:Electrodes at the outside ends 6a, 7a of two U-shaped fluorescent lamps 6, 7, respectively, arranged in parallel right under a rectangular diffusing plate 3 are wired to the output terminal 12H on the high voltage side of an invertor circuit 11, while electrodes at the inside ends 6b, 7b are wired to the output terminal 12L on the low voltage side of the invertor circuit 11. The thickness of fluorescent coats 8 at the outside ends 6a, 7a of the fluorescent lamp 6, 7 is greater than that at the inside ends 6b, 7b. When the fluorescent lamps 6, 7 are lit via the invertor circuit, the luminance of the outside ends 6a, 7a having more thickness and high voltage surely increases, the luminance of the center and periphery areas on the diffusing plate 3 are well-balanced and luminance uniformity is improved to 85% or more in total. |
