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Topics - dnmeid

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TFTs / NHD-4.3-480800EF-CTXP backlight
« on: July 22, 2014, 11:53:33 AM »
Hello,
we want to use the mentioned display but I'm not exactly sure how to design the supply for the backlight.
The datasheet shows eight LEDs in parallel between pins 2 and 3 and a PWM input on pin 39.
How should this be understood?
I guess I have to connect a constant current source with 120mA to LED-A and LED-K and am able to switch the backlight with a 3.3V logic level signal on the PWM input.
So the PWM signal is fed into the display and not delivered by the display.
Is this right or did I got it wrong?
What is the recommended way of connecting the backlight?

Dorian

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