| 摘要 |
By arranging a sensor printed circuit board (3) equipped with a light sensor (10) at the side of a reflector sheet (16) of a liquid crystal module (1) formed of a liquid crystal panel (11), a diffusion sheet (12), a light collective sheet (13), a fluorescent tube (14), a light directing plate (15), and the reflector sheet (16) via a doughnut-shaped cushion (4), light leaking from the reflector sheet (16) is detected. The detected output and a luminance value set by a setting device (25) are compared. A MPU (22) controls an inverter (24) to drive the fluorescent tube (14) so that the luminance value set is achieved. <IMAGE> |
