Sounds like you are one of those rare souls with a very short retinal persistence. I find no noticeable flicker, or "strobe", on any LED displays where all characters are scanned on less than 1/30th of a second. You are a prime example of doing "worst case" design, and going for a 1/40th or 1/50th of a second full scan. I have heard of people that get headaches watching commercial movies because the 1/24th of a second frame rate flickers dramatically to them. CIAO - Martin "long persistence" Green elimar@bigfoot.com ---------- From: Mike Smith[SMTP:mikesmith_oz.nosp*am@relaymail.net] Sent: Tuesday, September 16, 1997 4:09 AM To: PICLIST@mitvma.mit.edu Subject: Re: Multiplexing Seven Segment Displays On 15 Sep 97 at 23:05, Shane Nelson wrote: > That crossed my mind too. Another possible asset would be the > exact same amount of current going through each segment. I've > found that when you light an entire digit (for the number 8) it > isn't as bright as when you light only a few segments (like the > number 1). Has anyone done this? Any comments? > Another thought would be randomising (pseudo) the order you switch segment to segment to digit *completely* I find the normal digit strobe effect quite irritatting, but if it was randomised, one mightn't notice it. MikeS (remove the you know what before replying)