| 摘要 |
PROBLEM TO BE SOLVED: To increase an illumination effect and a dramatization effect by varying the color of light emitted from a luminescent element and simply adjust the brightness of the light. SOLUTION: Sixteen LEDs 74A to 74P are put into four groups, and driving pulses supplied to the LEDs 74A to 74P from luminously driving circuits are periodically or irregularly thinned, when luminously controlling a plurality of LEDs 74A to 74P by outputting driving pulses to them with the timing of lighting for every reference period by four grounding circuits cyclically grounding the four groups in every predetermined permissible period and the four luminously driving circuits sequentially luminously driving a plurality of LED 74A to 74P, respectively for a prescribed micro period within the predetermined permissible period. Therefore, the brightness of light and the depth of color can be simply adjusted in accordance with the degree of thinning driving pulses and light can be made darker or brighter.
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