Refreshing...
Posted: Tue Mar 30, 2010 10:08 pm
Hi brad,
Just Curious, with the matrix LED sign you have all the LED anodes in a given ROW feeding to one transistor, and all the cathodes in a column feeding to another transistor.
I am guessing that the screen is thus refreshed by "scanning" through the entire panel form top left to bottom right sequentially ... and activating the Row and Column transistor for any given LED's if required.
Is that right???
If so, what is the ON time for a single led?
guessing ( (1/refreshrate) / number of LEDs)
Cheers,
Fin.
Just Curious, with the matrix LED sign you have all the LED anodes in a given ROW feeding to one transistor, and all the cathodes in a column feeding to another transistor.
I am guessing that the screen is thus refreshed by "scanning" through the entire panel form top left to bottom right sequentially ... and activating the Row and Column transistor for any given LED's if required.
Is that right???
If so, what is the ON time for a single led?
guessing ( (1/refreshrate) / number of LEDs)
Cheers,
Fin.