Motoring Discussion > Bouncing LEDs. Miscellaneous
Thread Author: Old Navy Replies: 6
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New Thu 21 Nov 13 10:38 
 Bouncing LEDs. - Old Navy
Some time ago there was a discussion about the bouncing LED effect. This morning I saw a really marked effect in my mirror on the variable speed signs over the motorway on the opposite carriageway. They appeared to be bouncing independently of each other. Can anyone explain why this is only apparent in a mirror?
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New Thu 21 Nov 13 10:45 
 Bouncing LEDs. - Zero
The LEDS have a scan rate, the mirror has a vibration rate, and if they are harmonically sympathetic you get the strobe effect you see.
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New Thu 21 Nov 13 11:04 
 Bouncing LEDs. - Cliff Pope
The same explanation, I think, for the reversing tractor wheel effect I have sometimes observed in a mirror.
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New Thu 21 Nov 13 11:17 
 Bouncing LEDs. - Old Navy
Sounds reasonable, throw in the eye refresh rate as well and its a wonder they ever remain still :-)
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New Thu 21 Nov 13 11:23 
 Bouncing LEDs. - Focusless
>> Some time ago there was a discussion about the bouncing LED effect.

www.car4play.com/forum/post/index.htm?t=2779&v=f

EDIT: >3 years - yikes :)
Last edited by: Focusless on Thu 21 Nov 13 at 11:24
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New Thu 21 Nov 13 11:58 
 Bouncing LEDs. - Old Navy
>> EDIT: >3 years - yikes :)
>>

Time may speed up with age but at least my long term memory isn't failing yet. :-)
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New Thu 21 Nov 13 15:51 
 Bouncing LEDs. - martint123
Sometimes very weird artefacts when viewed on TV.
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