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Old 02-06-2012, 07:46 AM #1
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Default How do laser/led projectors make green light

I know the blue comes from laser diodes,
and red comes from a powerfull led

Where does the green come from

(Sorry if this is the wrong place, best i could come up with...)


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Old 02-06-2012, 07:50 AM #2
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Default Re: How do casio's make green

Please edit the title of the thread to an indirect spelling of the brand - we don't want c0ldshadow to get in trouble.
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Old 02-06-2012, 08:09 AM #3
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Default Re: How do casio's make green

Quote:
Originally Posted by Sigurthr View Post
Please edit the title of the thread to an indirect spelling of the brand - we don't want c0ldshadow to get in trouble.
Got a link? Sorry for my ignorance
I wasn't aware I couldnt say the C word?
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Old 02-06-2012, 08:13 AM #4
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Default Re: How do casio's make green

No link on hand, it has been discussed here on the forums though.

Companies like K@$10 have search algorithms which report where they were mentioned and often they're aware of it within hours. Let me tell you they are NOT happy we're ripping apart their products for diodes.
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Old 02-06-2012, 08:18 AM #5
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Default Re: How do casio's make green

Quote:
Originally Posted by Sigurthr View Post
No link on hand, it has been discussed here on the forums though.

Companies like K@$10 have search algorithms which report where they were mentioned and often they're aware of it within hours. Let me tell you they are NOT happy we're ripping apart their products for diodes.
Thats kind off strange...
well im just wondering how they make green light, but what ever, ill change it.
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Old 02-06-2012, 08:20 AM #6
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Default Re: How do laser video projectors make green

They do it by beaming some of the laser light off a phosporescent disc. The disc reacts and glows bright green. To prevent the lasers burning through it, it spins around so only part of the disc is in the beampath at any one time.

edit: Thanks for changing title.
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Old 02-06-2012, 08:26 AM #7
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Default Re: How do laser/led projectors make green light

Cool, so the blue lasers diodes make green and blue,

Is it 50%, 50%, or does more go to making one of the colors?
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Old 02-06-2012, 08:28 AM #8
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Default Re: How do laser/led projectors make green light

I dont know - I havent studied it, I just recall reading a little on how they worked.
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Old 02-06-2012, 11:10 AM #9
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Default Re: How do laser/led projectors make green light

The color wheel has about 5/6 of it the reflective phosphorescent color, and the rest just directly passes the blue. Still, that's just color wheel ratio, and the lasers themselves can be modulated for whatever brightness or color mix is actually needed.
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Old 02-06-2012, 02:55 PM #10
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Default Re: How do laser/led projectors make green light

What is the benift VS using a green Led? Production cost, or efficiency?
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Old 02-08-2012, 06:57 PM #11
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Default Re: How do laser/led projectors make green light

There simply is no such diode at the moment ..
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Old 02-08-2012, 07:08 PM #12
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Default Re: How do laser/led projectors make green light

The only other thing they could have done was use the a green led, but that would require just as much heatsinking and space as the red led took up, the "phosporescent disc" alternative uses a lot less space and is easier on power.
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Old 02-08-2012, 07:45 PM #13
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Default Re: How do laser/led projectors make green light

Quote:
Originally Posted by DrSid View Post
There simply is no such diode at the moment ..
There is a green version of the red LED's they use...


in latest xj-h series projectors
Dont they use a blue LED instead of blue lasers for blue,
and still use blue lasers for green.

why would they do that???

If lasers are more efficient, wouldn't the smart move to be, getting rid of the red led, and replacing it with somthing like the 500mW midsubishi red laser diodes?
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Old 02-08-2012, 07:46 PM #14
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Default Re: How do laser/led projectors make green light

I see .. interesting ..
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Old 02-09-2012, 12:19 AM #15
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Default Re: How do laser/led projectors make green light

You know that after you edited the thread title the next four posts still have KasEO in their title. They have to individually go back and edit their own post titles to take it out.

I imagine using the blue lasers just to make the green either has to do with efficiency or the shade of green produced by green led's.
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Old 02-09-2012, 12:35 AM #16
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Default Re: How do laser/led projectors make green light

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I imagine using the blue lasers just to make the green either has to do with efficiency or the shade of green produced by green led's.
I was thinking it had to do with quality of the green light,
Considering it takes 5X as much blue laser to make the green vs blue
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