Backlight circuit, and method and terminal for controlling voltage of backlight circuit
A backlight circuit and voltage technology, applied in the field of terminal equipment, can solve the problems of low backlight efficiency, inability to guarantee backlight brightness, and voltage consumption.
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[0029] The brightness of the backlight of the terminal product is often adjustable, and several levels of brightness are set on the user interface for the user to set. On the hardware, the purpose of changing the brightness of the backlight is achieved by adjusting the current in the LED, and different brightness levels of the backlight correspond to different current levels. The greater the LED operating current, the higher the voltage across the LED; on the contrary, the smaller the LED operating current, the lower the voltage across the LED. The LED backlight circuit with DC / DC function in the prior art always provides a sufficiently high voltage, so that the voltage provided at low brightness levels will be much more plentiful, and these voltages will be consumed by the current control circuit, forming unnecessary heat loss.
[0030] The embodiment of the present invention is mainly aimed at a backlight circuit with a DC / DC function, and provides a backlight circuit witho...
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