Backlight module with variable lightness and brightness control method
A backlight module and brightness control technology, applied in the field of brightness devices, can solve the problems of excessive driving voltage, affecting the overall efficiency, and circuit out of control when the current is zero, so as to achieve product competition superiority, avoid circuit out of control, and reduce costs The effect of the budget
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[0051] Preferred embodiments of the variable brightness backlight module of the present invention will be described in detail below with reference to the accompanying drawings.
[0052] Please refer to Figure 4A , which shows a device block diagram of a variable brightness backlight module according to a preferred embodiment of the present invention. exist Figure 4A Among them, the constant voltage / constant current conversion driver 401 is connected in series with the switch 403, the light emitting diode string 405, and the sensing resistor 404 in sequence, wherein the constant voltage / constant current conversion driver 401 includes a constant current drive module (not shown), a constant A voltage driving module (not shown), and a switching module 406 . In addition, the sensing resistor 404 is electrically connected to the constant voltage / constant current conversion driver 401 , and the controller 402 is electrically connected to the switch 403 and the constant voltage / co...
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