| 摘要 |
A surface illuminant device to be set as a backlight of a liquid crystal display panel has a light guide plate and LEDs. The LEDs each include LED chips for emitting rays of light having wavelengths of red, green, and blue, which are each driven by an LED drive control circuit. The LED drive control circuit supplies drive currents to the respective LED chips through an LED driver, according to the ratio of light emission intensities among rays of light to be emitted from the LED chips, which is calculated by a computing unit based on a ratio among transmissivities which stored memory, when passing through the liquid crystal display panel, of the rays of light having their own wavelengths, and a memory-stored ratio of intensities among rays of light having their own wavelengths required in order that a white display is obtained by each LED itself.
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