I want to connect K pin (or LED-) of LCD to the NPN transitor, so i can control it. The question is how can i calculate resistor value? I found this schematic online, do you think it would work?
Backlight supply voltage is 3V, current is 16mA.
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And it depends on whether your LCM is single voltage supply or double. For double, you may need to adjust both voltages. A simple explanation is here.