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OK, so some people around here work with LCDs...
We've got a laptop at work with a cracked screen. Around where the crack
is, the pixels are all black. Which isn't surprising. Slightly more
interesting is the red vertical lines that seem to extend vertically
outwards from the cracks. Why red? Why every other pixel? Why vertical?
I have no idea.
What's weirder still is that close to the cracks, the dead pixels
exhibit a curiously fractal pattern. It looks like some kind of weird
pixellated plant growth or something. Does anybody have any idea why?
(I've got photographs, but I'd have to find something that has Bluetooth
in order to get them off my phone...)
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On 8/7/2015 6:05 PM, Orchid Win7 v1 wrote:
> I've got photographs
Unless we see them. It is not true. ;-)
--
Regards
Stephen
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Orchid Win7 v1 <voi### [at] dev null> wrote:
> What's weirder still is that close to the cracks, the dead pixels
> exhibit a curiously fractal pattern. It looks like some kind of weird
> pixellated plant growth or something. Does anybody have any idea why?
No idea. But it reminds me of what I saw last year on somebody's water damaged
plasma TV. The unit worked fine, except for a localized black dendritic growth
that looked a lot like a cellular automaton. The guy said it changed and moved
across the screen over time... very strange (but cool).
> (I've got photographs, but I'd have to find something that has Bluetooth
> in order to get them off my phone...)
Can you at least upload them to this site? http://postimage.org/
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Am 07.08.2015 um 19:05 schrieb Orchid Win7 v1:
> What's weirder still is that close to the cracks, the dead pixels
> exhibit a curiously fractal pattern. It looks like some kind of weird
> pixellated plant growth or something. Does anybody have any idea why?
Because the display is now a hardware implementation of a cellular
automaton?
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Orchid Win7 v1 <voi### [at] devnull> wrote:
> OK, so some people around here work with LCDs...
>
> We've got a laptop at work with a cracked screen. Around where the crack
> is, the pixels are all black. Which isn't surprising. Slightly more
> interesting is the red vertical lines that seem to extend vertically
> outwards from the cracks. Why red? Why every other pixel? Why vertical?
> I have no idea.
>
> What's weirder still is that close to the cracks, the dead pixels
> exhibit a curiously fractal pattern. It looks like some kind of weird
> pixellated plant growth or something. Does anybody have any idea why?
>
> (I've got photographs, but I'd have to find something that has Bluetooth
> in order to get them off my phone...)
At first, I was thinking it could be a moire effect, but...
"LCD stands for "liquid crystal display" and the liquid crystal inside a screen
is subject to different levels of current to change the amount of the backlight
that passes through. When a screen is cracked, this process breaks down and
incredible patterns emerge, as some sections of the goo is electrified and some
isn't." -- Wired UK
Fractal forums had something about it possibly being a form of Diffusion-Limited
Aggregation. Something like a Lichtenberg Figure, maybe?
Diffusion-Limited Aggregation is a process whereby, particles undergoing a
random walk via Brownian motion, tend to cluster together.
It would make sense that the crack in the screen disrupts the even distribution
of electrons through the liquid crystal, and the result is that the distribution
becomes chaotic and the electrons go where other electrons have been.
I have no technical expertise with electronics, so this is the best idea I can
come up with. I have nothing on the red lines.
Regards,
A.D.B.
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"Anthony D. Baye" <Sha### [at] spamnomorehotmailcom> wrote:
> Fractal forums had something about it possibly being a form of Diffusion-Limited
> Aggregation.
http://www.fractalforums.com/fractals-in-nature/broken-lcd-screen/
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On Fri, 07 Aug 2015 19:05:08 +0200, Orchid Win7 v1 <voi### [at] devnull> wrote:
> OK, so some people around here work with LCDs...
>
> We've got a laptop at work with a cracked screen. Around where the crack
> is, the pixels are all black. Which isn't surprising. Slightly more
> interesting is the red vertical lines that seem to extend vertically
> outwards from the cracks. Why red? Why every other pixel? Why vertical?
> I have no idea.
>
> What's weirder still is that close to the cracks, the dead pixels
> exhibit a curiously fractal pattern. It looks like some kind of weird
> pixellated plant growth or something. Does anybody have any idea why?
>
> (I've got photographs, but I'd have to find something that has Bluetooth
> in order to get them off my phone...)
Our laptop had vertical multicoloured lines and not much fractal beauty.
--
-Nekar Xenos-
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On Sat, 08 Aug 2015 05:09:58 +0200, Samuel Benge <stb### [at] hotmailcom>
wrote:
> fractalforums
After scrolling down, the next two images show these wonderful leaf-like
fractals.
Does anyone know the algorithm for these? I would really like to be able
to use it off-off-topic :)
--
-Nekar Xenos-
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"Nekar Xenos" <nek### [at] gmailcom> wrote:
> On Sat, 08 Aug 2015 05:09:58 +0200, Samuel Benge <stb### [at] hotmailcom>
> wrote:
>
> > fractalforums
>
> After scrolling down, the next two images show these wonderful leaf-like
> fractals.
> Does anyone know the algorithm for these? I would really like to be able
> to use it off-off-topic :)
I know of at least two ways.
The first method has a seed layer (2D or 3D array), and a 1D array of particle
positions. Each particle moves around randomly (usually via Brownian motion)
until it detects a positive value on the seed layer. At this point it dies and a
value is added to the seed layer. Another particle is then introduced from some
convenient location, such as a screen edge. Since a particle rarely slips
between pixels before making contact, branching growth occurs.
The second method uses an additional 2D or 3D layer representing a solution
(instead of an array of particles). Every cell is evaluated at every frame. The
solution layer is 'saturated' at initialization. If the solution layer has
material to expend and a neighboring cell of the other layer has a positive
value, then material is added to that other layer and material is subtracted
from the solution. The solution is blurred each frame, which simulates diffusion
(albeit with some loss).
I hope that made sense :/ Maybe I'll get something going and upload it to
glslsandbox.
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"Samuel Benge" <stb### [at] hotmailcom> wrote:
> Maybe I'll get something going and upload it to glslsandbox.
OK, here's something if anyone's interested: http://glslsandbox.com/e#27058.0
You'll have to place the mouse in the lower left corner to properly initialize
the layers (goofy mistake). Seeds are automatically placed under the mouse
cursor.
The effect tends to be large-scale compared with other diffusion-limited
aggregation setups, but it can be tweaked by changing the settings.
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