| 摘要 |
PROBLEM TO BE SOLVED: To easily obtain uniform surface light emission, without forming a gradation pattern or depending on artisanship for fine adjustment of the scattered quantity by mold adjustment. SOLUTION: With respect to a backlight of a liquid crystal display device comprised of an LED light source 1, a light transmission plate 5, and a reflection case 4, the light transmission plate 5 has a conical bottom shape, which has a prescribed solid angle with the position of the LED light source as the center. |
