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2x16 LCD Screen Character Background Problem

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flashabu

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[SOLVED]2x16 LCD Screen Character Background Problem

Hi guys,

I have a strange problem with displaying text/characters on my blue backlit 2x16 LCD screen. The code is working correctly and if I look the screen with an angle, I can read it. However it cannot be read by looking the screen from above. Here I am attaching the photos of my problem:

20140224_145447.jpg20140224_145459.jpg

I don't put those boxes there and I have no idea where they come from:) Can there be a wrong connection or smth? Any idea?
Thanks a lot

- - - Updated - - -

It was the most quick problem solving of mine :D It was because of over voltage. I connect a 4.7K resistor through V0, problem is gone:) If somebody faced such thing, try this.
 
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paulfjujo

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hello,

try to reduce the back light...by adding serial resitor.
and play with contrast adjustment.
 

MUKESH.K.S

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Re: [SOLVED]2x16 LCD Screen Character Background Problem

Use 10k pot to adjust the contrast lab2schem.png
 

ADGAN

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You haven't adjust the contrast
 

pjmelect

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I agree, the contrast control is set to high, you should set the contrast for a compromise between readability and speed of response, the adjustment between the two is very fine. You should fit a pot and not a fixed resistor otherwise the speed of response is not optimally set.
 

bianchi77

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put 10K trimpot to the GND on LCD VEE pin, adjust it until you can see the best contrast, mostly I put 1K resistor to ground to make it fix....so far it works for me...
 

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