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GHI Character Display: Bad contrast


#1

I have bought 2 GHI 16x2 character Displays modules (the whole Display, not controller only) but I can barely read anything.
I have to look at it at an angle of about 45° from below to read anything.
I have tried this with both Displays.
My G120 HDR is supplied by the USB DP module with an 6V power supply.
I also tried to dim the backlight by reducing the voltage on the backlight pin, but this does not help eather.
As Test program I used an empty gadeteer Project with Cobra II and chracter Display module connected to Socket R (from RGB)

Any ideas how to improove the contrast of this Display?
If it is like this I can not use it.


#2

both show same contrast? How are you powering the board?


#3

6v is possibly part of your problem. Because the DP is regulating the power, you will get a decrease in voltage. The specs page say 7v - https://www.ghielectronics.com/catalog/product/280 " The power supply is fully functional from 7V to 30V"


#4

Thanks Brett. Yes you are right. 6V is not okay for the DP module.


#5

Ok, my fault.
More power did the trick.
Thank you.