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| Banding on display http://forum.lcdinfo.com/viewtopic.php?f=6&t=2162 |
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| Author: | new299 [ Fri Mar 09, 2007 8:17 ] |
| Post subject: | Banding on display |
Hi All, I'm setting up a display from a Psion Series 5 PDA. All is going well except I'm getting lots of banding, where there is a white it spreads vertically across the whole screen. Pictures are online at: www.psionresurrection.org is this a common problem? Any idea what the cause might be or which parameters I should alter? Thanks for reading! |
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| Author: | Henri [ Fri Mar 09, 2007 13:29 ] |
| Post subject: | |
Did you get this banding problem after you got your new DC/DC converter ? Maybe it doesn't give you clean enough voltage. You could try adding more filtering. What kind refresh rate are you running this display with ? Often passive panels use something like 60-70 Hz but some displays might like other refresh rates better. Does your panel have a separate AC bias input pin (could be called M) ? Some panels require this to be supplied externally and some generate this AC bias signal internally from the other input pins. If you are supplying this externally you could try changing the frequency of this. |
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| Author: | new299 [ Fri Mar 09, 2007 15:05 ] |
| Post subject: | |
Quote: Did you get this banding problem after you got your new DC/DC converter ? Maybe it doesn't give you clean enough voltage. You could try adding more filtering. I had it before, but not as bad. How do I go about filtering? Quote: Does your panel have a separate AC bias input pin (could be called M) ? Some panels require this to be supplied externally and some generate this AC bias signal internally from the other input pins. If you are supplying this externally you could try changing the frequency of this.
It does, changing the frequency seems to make the display overall darker but the banding still occurs. |
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| Author: | Henri [ Sun Mar 11, 2007 12:50 ] |
| Post subject: | |
new299 wrote: I had it before, but not as bad. How do I go about filtering? You could try adding some capacitors to the DC/DC converter output. Quote: Quote: Does your panel have a separate AC bias input pin (could be called M) ? Some panels require this to be supplied externally and some generate this AC bias signal internally from the other input pins. If you are supplying this externally you could try changing the frequency of this. It does, changing the frequency seems to make the display overall darker but the banding still occurs. You didn't mention the refresh rate you're running the display at. And have you tried changing that ? |
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