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>Matrix displays don't drive LEDs in parallel Many of them do, especially the outdoor single color ones, where 1 led per pixel isn't bright enough. >Holiday l
by tyingq 5y ago
>Matrix displays don't drive LEDs in parallel
Many of them do, especially the outdoor single color ones, where 1 led per pixel isn't bright enough.
>Holiday lights generally aren't in parallel
Granted, "holiday lights" is a broad category, but there are many that are obviously in parallel. Two 1.5 volt batteries couldn't power many LEDs in a serial string. And many of the AC strings are parallel strings of serial connected LEDS as well. Like: https://midimagic.sgc-hosting.com/chrsleds.htm https://midimagic.sgc-hosting.com/chrsleds.htm
- mindslight 5y agoI would assume matrix displays with multiple LEDs for brighter output would still mostly put them in series, because a single LED voltage drop doesn't make for a nice voltage to work with. With parallel strings of LEDs in series, statistics helps match I-V curves. But perhaps some uncommon design constraints make some signs work out the other way. There are always going to be exceptions (like your 2 cell battery example, or "LED throwies"), but we're talking about the common scenarios. In general I think talking about putting LEDs in parallel is just confusing for anyone that's reading an article to know what size resistor to use.
- tyingq 5y ago>But perhaps some uncommon design constraints make some signs work out the other way. Yes, they use a lot of ICs that are either 3.3v or 5v as the driver to the LEDs.