R
roxlu
- Jan 1, 1970
- 0
Hi!
I'm working on a LED display and I want to see how much LEDs I
can ultimately drive using a 5v, pic16f628. Now, I'm using 2 shift
registers and multiplexing to drive 64 LEDs. Now I want to extend
the amount of LEDs I'm using.
I'm "scanning" through the columns and only one column is on
at a certain moment. Per column I put on the rows for which I want
the LED to be on.
I heard that when I want to use more than 10 columns, I must push
more current through the LEDs. I can imagine that this must be done
because the time when the LED is on decreases when the number of
columns increases. And pushing more current trhough them will
let the shine brighter, so our eyes won't see a difference....
Is this why they need more current? And how many columns or rows
can I use?
Greetings
I'm working on a LED display and I want to see how much LEDs I
can ultimately drive using a 5v, pic16f628. Now, I'm using 2 shift
registers and multiplexing to drive 64 LEDs. Now I want to extend
the amount of LEDs I'm using.
I'm "scanning" through the columns and only one column is on
at a certain moment. Per column I put on the rows for which I want
the LED to be on.
I heard that when I want to use more than 10 columns, I must push
more current through the LEDs. I can imagine that this must be done
because the time when the LED is on decreases when the number of
columns increases. And pushing more current trhough them will
let the shine brighter, so our eyes won't see a difference....
Is this why they need more current? And how many columns or rows
can I use?
Greetings