lcd display problem

hi i have a problem with my lcd monitor.i have not good contrast.i have tried many resistors (10K,5K,3K,100ohmand 50ohm) but the contrast isn't very good.The best contrast who i have seen is : Any help?

Your problem is that you have not provided power to the backlight. That is what pins 15 and 16 are for. You will need to consult the datasheet for your LCD module to determine the power requirements.

Don

The contrast seems to be OK, nut I don't see the backlight connected. The last two pins. Don't forget that you need a resistor. It's around 100ohms. Pin 15 should be anode (+) and 16 kathode (-)

thanks you very much

Don't forget that you need a resistor.

Probably.

It's around 100ohms. Pin 15 should be anode (+) and 16 kathode (-)

Maybe.

Don