| 摘要 |
PROBLEM TO BE SOLVED: To adjust the brightness of a direction display means appropriately for every hall without degrading image quality of the direction display means. SOLUTION: In adjusting the brightness of a liquid crystal part 101 as the direction display means, light shielding films 810 to 813 of a brightness adjustment mechanism 800 as a brightness adjusting means are freely drawn from a position which does not cover the liquid crystal part 101 to a position which covers the liquid crystal part so as to adjust brightness of the liquid crystal part 101. Thus, it is unnecessary to adjust a drive voltage or drive current on the side of the liquid crystal part 101 and so a change of display, such as hue, due to unbalanced gradation display or the like can be prevented. COPYRIGHT: (C)2009,JPO&INPIT
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