- cross-posted to:
- britishproblems@feddit.uk
- cross-posted to:
- britishproblems@feddit.uk
This has been shining in my eyes for the last 10 minutes whilst the bus driver takes a break.
This has been shining in my eyes for the last 10 minutes whilst the bus driver takes a break.
They do need to be that bright at daytime, and most indeed use automatic brightness by default. If only there was a technology that could use daylight instead of fighting it…
I mean, I don’t think an advert needs to be illuminated at all, frankly
They also don’t need to be visible, or exist at all for that matter. I despise ads.
This is in general for LED text signs. The “inventors” (more like engineers because they just combined multiplexing with superbright LEDs) OP mentioned probably didn’t specify a purpose, they just wanted a more reliable alternative to mechanical or manual signage but yes, most are for ads.
cons: significantly more expensive, don’t work in total darkness, don’t catch attention
They have an LED each in the top-right corner of the corresponding dot. The LEDs use different driving signals (much higher frequency and not just when the display changes) but are kept in sync with the slow-updating display to allow both technologies to complement each other: they do work in total darkness and faulty dots have LEDs as a fallback; the LEDs are half-brightness at night, full brightness at dusk and off in daylight.
Also, they were significantly LESS expensive than a sufficiently luminous LED display in the 90s before superbright LEDs existed.
As I said in another comment, they weren’t designed for ads but info signage, so they don’t actively catch attention, which is what you want to get a visually cleaner environment.