If the light source is configured to be capable of applying the illumination light to the entire display area of the display panel. Current or voltage of each LED (Light Emitting Diode) are supplied to each LED from the drive / compensation circuitry. A part of light emitted from the LED is converted to an electrical signal resistance of each photodiode is reduced in proportion to the brightness. When the increase in the luminance of the light emitted from each LED, the lower the luminance of the light emitted from each LED is reduced and the resistance value of each photodiode. Back in the resistance value of the LED driving / correcting circuit for changing the driving current or the driving voltage corresponds to the luminance of the light emitted from each LED luminance setting voltage. The photodiode is mounted on a one-to-one relationship for each LED. ; A surface light source, the luminance correction circuit
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