I have a 4-digit display that I am multiplexing (using a MAX7219, which has a scan rate of 800Hz). These are large digits (2.3"), and when I drive a stand-alone single digit with a 12V supply, I can use a 510 ohm current-limiting resistor per segment and it's just as bright as I want it (and near the maximum allowable current). When I multiplex using the same value of current-limiting resistor, of course it's dimmer, so here is my question:
Can I just reduce the value of the current-limiting resistor to make my multiplexed digits brighter?
If I use a lower-value resistor, I'm concerned that during the "on" time, the current will exceed the rating of the LED segments. If this is a valid concern, is there a standard solution to increasing the brightness when multiplexing? Or are dim digits the price one pays for multiplexing?
Thanks in advance.
Can I just reduce the value of the current-limiting resistor to make my multiplexed digits brighter?
If I use a lower-value resistor, I'm concerned that during the "on" time, the current will exceed the rating of the LED segments. If this is a valid concern, is there a standard solution to increasing the brightness when multiplexing? Or are dim digits the price one pays for multiplexing?
Thanks in advance.