Hey Group,

I am building an 8x8 LED matrix device. I am planning on NOT using resistors to limit current to the LED's. In one example I looked at it appears the on time is ~1.5 mS.

Therefore, I was wondering... How does one determine the amount of time that you can safely turn on the LED's without damaging them? I do not have the 8x8 LED modules yet, so I do not know whether they are common anode or cathode. I plan on using one PIC pin to control a ROW and one pin to control a Column.

I realize there are several factors at play here. Such as... supply voltage, number of LED pixels on at any given time (up to 8), etc.

In my case I plan on using 3 volt supply.
I have not determined whether to scan the display rows or columns. One would have only 1 LED lit at a time and the other would have from 1 to 8 LED's on at one time. (I would also be interested in suggestions on the correct way to scan the display?)

Thanks