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Index > Heap > Micron FLCOS (new type of display media, LCD?)

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Madis731



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Madis731

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Post 21 May 2009, 07:36
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Mac2004



Joined: 15 Dec 2003
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Mac2004
Looks interesting Smile

regards,
Mac2004
Post 21 May 2009, 11:56
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sleepsleep



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sleepsleep
cool,
when we can get?
Post 21 May 2009, 16:49
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revolution
When all else fails, read the source


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revolution
It appears to be LCD but the website description is not clear about how the three colours are generated.

From what is said there it seems that each colour is generated in succession as a time based on-to-off-ratio. But what generates the colour? Does it have three main backlight LED's that are switched sequentially? Or does each pixel have an individual set of three LED's (or what?) behind the LCD panel? A normal LCD just uses a colour filter but they say that this technology does not use filters so where do they create the colours?
Post 21 May 2009, 19:45
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Borsuc



Joined: 29 Dec 2005
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Borsuc
Did you even read the entire article?

Quote:
Running at these speeds enables our Displaytech microdisplays to use field sequential color
The 3 LED per pixel stuff is out of the question since it's even a picture comparing "spatial" color to sequential color.

Your first assumption (backlight changing fast) is more valid although they haven't given full information about it.



Will this shit be used in virtual helmets or something like that? It's about time we get energy-efficiency and privacy on vision like we do with audio (headphones vs speakers!) and cheap too.

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Post 21 May 2009, 23:26
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revolution
When all else fails, read the source


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revolution
Borsuc wrote:
Did you even read the entire article?
Umm, yes
Borsuc wrote:
Your first assumption (backlight changing fast) is more valid although they haven't given full information about it.
Okay, so you don't know either then.
Post 22 May 2009, 00:11
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LocoDelAssembly
Your code has a bug


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LocoDelAssembly
Looks like if this is ever used on computers a new signaling scheme will be required (or the monitor will have to buffer a frame and be always one frame behind the actual frame).
Post 22 May 2009, 01:41
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Madis731



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Madis731
Actually you can deal without a new signaling scheme. If you send grey (#CCCCCC) to your new LCD for 1/60th of a second, then this might be rendered in the following manner:
1) There are 5 delay-registers.
2) Each delay-register is shifted by 1/360th of a second (compared to previous one).
3) RED is fired immediately, but GREEN will wait for 1/360s and so will BLUE after it. Then there's another wave of R-G-B and we have 1/60th of a second "wasted".

I think its not that complicated.
Post 25 May 2009, 06:26
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pete



Joined: 20 Apr 2009
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pete
They have a Flash Video file on the site where they explain the method; your browser or proxy probably filters that out, revolution. Here's the adress for a direct download of the video file (FLV format, can be opened with VLC media player): http://www.youtube.com/get_video?video_id=it5zQfMAwxI&t=vjVQa1PpcFMUDEaoBr4OIYldQ556bGyRlHeJYx8OJNM=&eurl=http%3A%2F%2Fwww%2Emicron%2Ecom%2Finnovations%2Fflcos%2Findex&el=embedded&ps=default&fmt=34
Post 25 May 2009, 07:53
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revolution
When all else fails, read the source


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revolution
Thanks pete, but the link just gives me a blank page. So what do they say in the video, that they use three separate back light generators, or something else?

[edit]
Oops Embarassed how did I mix those up?! Sorry pete.


Last edited by revolution on 25 May 2009, 10:36; edited 1 time in total
Post 25 May 2009, 09:38
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MazeGen



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MazeGen
revolution wrote:
Thanks bitRAKE, but the link just gives me a blank page. So what do they say in the video, that they use three separate back light generators, or something else?

pete is bitRAKE's secret alter nick? Smile
Post 25 May 2009, 10:34
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pete



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pete
Quote:

pete is bitRAKE's secret alter nick?

I don't believe so… perhaps a mistake from revolution.

They show that the three color channels red, green & blue get displayed in a row and very fast (60 frames per second and channel), that the eyes gets outfoxed and sees the color that would emerge if all channels would lay above each other at the same time.
Post 25 May 2009, 10:41
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revolution
When all else fails, read the source


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revolution
Yes, my mistake, distracted with some other things.

Anyhow, do they show what generates the original colour? I am guessing that the backlight is changed for each frame.
Post 25 May 2009, 10:44
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El Tangas



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El Tangas
They have some techncal docs here (mostly scientific papers): http://www.displaytech.com/library.html

Also, this patent US 2,493,200 (from 1946...) explain the basis of the process.

From what I understand, you have 3 liquid crystal color filters stacked toghether, one lets red pass (depending on voltage) or is transparent, the same for green and blue. The backlight is always white, the filters generate the actual colors. So the color frames are generated by sequentially activating each filter.
In normal lcds, these filters are side by side and all work at the same time, I think this is the main difference.
Post 25 May 2009, 11:19
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pete



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pete
What exactly do you mean by "what generates the original colour"?
They explain that animation is created with multiple still images and that color can be generated exactly like that, by flipping through the three color channels very fast.
For each image the color-subframes get generated; each color-subframe gets generated with 256 exposure-levels to create deep.
(3 * 256 * 60; three channels * 256 subframes * 60 frames per second)
Post 25 May 2009, 11:20
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revolution
When all else fails, read the source


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revolution
Okay, but if the back-light is white, for example, then this would not work since they state there are no (colour) filters.
Post 25 May 2009, 11:23
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El Tangas



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El Tangas
I'm not sure they state there are no filters. In US 2,493,200 they have "dichroic subtractive filters" whatever that is.
Post 25 May 2009, 11:38
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revolution
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revolution
To create the image for each subframe, the brightness of any pixel is varied by exposing light through it for different lengths of time (not filtering light, like spatial color LCOS)
Post 25 May 2009, 11:41
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revolution
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revolution
El Tangas wrote:
In US 2,493,200 they have "dichroic subtractive filters" whatever that is.
That is just a fancy way of saying reg, green and blue filters. Since each colour has has two colour components (di-chromic) filtered out. Cyan, Magenta and Yellow are the base subtractive filters that are applied, any two of those together will give the familiar Red, Green and Blue.
Post 25 May 2009, 11:43
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El Tangas



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El Tangas
OK, in this case, we would have to look up their patents to see exactly how it works. The details in the site are to superficial.
Post 25 May 2009, 11:52
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