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Erik Malund
02/15/12 10:19
Read: 377 times
Mt Airy, Nc

#185988 - 'matrix' is the killer
Responding to: Josť A. Ruiz's previous message
I'm doing some maintenance work on a LED matrix panel that shows scrolling text. The scroll rate in this particular case is hardcoded to the same value as the refresh rate (1 pixel scrolled per display refresh period).

My question is, is this scroll rate common? or if it isn't, which is the usual way to decouple refresh rate from scroll rate?

are the LEDs driven individually or do you illuminate by colomn and row scan?
if you do not have a separate (such as the 2221) driver for each individual LED you are locked to (multiples of) the scan rate. If you are, increase the scan rate and you will be able to scroll at the desired speed as a multiple.

I abhor displays driven by X and Y, the possibilities are soooo limited.


List of 9 messages in thread
Arbitrary-rate scroll in LED matrix display      Josť A. Ruiz      02/15/12 07:47      
   'matrix' is the killer      Erik Malund      02/15/12 10:19      
      Display is dynamic driven      Josť A. Ruiz      02/15/12 19:02      
         Artifact confirmed to be software bug      Josť A. Ruiz      02/16/12 01:06      
   anyhow,      Erik Malund      02/15/12 10:35      
   Impossible if dynamic      Erik Malund      02/15/12 14:16      
      Minimum refresh rate      Josť A. Ruiz      02/16/12 00:13      
         120 Hz      Michael Karas      02/16/12 06:44      
            Direction of view      Per Westermark      02/16/12 07:07      

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