Drive circuit and method of backlight unit
A technology of backlight unit and drive circuit, which is applied in the direction of lamp circuit layout, light source, electric light source, etc., can solve the problems of power consumption of voltage conversion circuit, etc., and achieve reduced power consumption, stable equivalent load, and more flexible dimming function Effect
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[0041] Figure 5A It is an LED driving circuit diagram according to an embodiment of the present invention. The driving circuit 500 is used to drive the backlight unit 540 , which includes a voltage conversion circuit 510 , a driving unit 520 and a digital dimming unit 530 . The backlight unit 540 includes a plurality of LED strings (not shown), and each LED string includes at least one LED. The voltage conversion unit 510 is coupled to the backlight unit 540 and is mainly used to convert the level of the DC voltage, such as a DC-DC converter such as a boost circuit or a buck circuit. , the input voltage V INThe driving voltage required for the backlight unit 540 is converted. The driving unit 520 is coupled between the other end of the backlight unit 540 and the digital dimming unit 530 . Generally speaking, the driving unit 520 is mainly used to adjust the conduction current of the LED and perform dimming functions, such as dimming, which can be replaced by the driving c...
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