| 摘要 |
PURPOSE: To continuously change a display color and to continuously change a display position by combining a light source for emitting light in a lot of colors with a material for selectively transmitting a wavelength. CONSTITUTION: A driving circuit 4 for a dichroic LED 1 and a red LED 2 for changing the color of emitted light into green and red has a transmission film 7 for transmitting the light of a driving circuit 5 for a green LED 3 and the dichroic color LED 1 and coatings 8 and 9 for transmitting only the light of a certain wavelength, and the transmission characteristics of the coatings 8 and 9 are gradually enlarged toward one end. Then, the red LED driving circuit 4 is turned off by gradually lowering light emission intensity and afterwards, the light emission intensity is gradually increased. Besides, concerning the green LED driving circuit 5, the light emission intensity is gradually increased from the OFF state and gradually lowered later. Thus, the display color can be changed from green to red and further, together with the change of the display color, the light emitting position can be moved as well.
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