flotulopex,The statement: "If I want to make the display brighter, I slow down the loop with the "Scan" pause making the digit to be powered longer." makes no sense if the drive circuitry is designed correctly and the software is truly multiplexing the digit drivers at 100%/number of displays. The only thing that lowering the display frequency will do is at the lower end of about 50 to 40 hz the viewer will start to see the telltale multiplexing action. If at 60 hz. or more the display brightness should not change as far as your eye is concerned. If your display gets brighter as you increase the frequency then your circuitry is not shutting off the digits fast enough. If it gets dimmer as you increase the frequency then your circuitry is not turning on fast enough. This is assuming you have the dutycycle set at 100%/number of displays with no delays. I have designed an automotive gage set using a 16f88 that runs a 4 digit + decimal point multiplexed display that has a 16 step dimming function thru an A/D channel tied to the dashboard dimmer. I chose 63 hz as the lowest frequency to eliminate the STROBING effect during driving.

Dave Purola,
N8NTA