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Old 03-31-2017, 06:39 PM #1
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Default More Green Diodes Incoming!

Looks like Sony's new top of the line video projector will be using green diodes, instead of DPSS green, like all previous laser projectors have been.

Now... What diodes do we think they're using, and what sort of impact might this have on our hobby?

I know we won't see anything like the Ca$i0 party we had - this projector will have a six figure price tag - but I'd like to think we might see some new sources (maybe even new diodes?) show up in the coming months.

Source: Sony 4K RGB Laser Projector at CinemaCon 2017 - AVSForum.com


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Old 03-31-2017, 07:37 PM #2
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Default Re: More Green Diodes Incoming!

Interesting, although it may not benefit us any due to the probably very high price tag. Not to mention it still seems to be in development stages, so it's likely a while out before we see a commercial product. Something to keep an eye on anyway. Thanks for sharing!
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Old 03-31-2017, 08:19 PM #3
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Default Re: More Green Diodes Incoming!

Thanks for sharing! New wavelengths are always welcomed here

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Old 03-31-2017, 08:52 PM #4
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Default Re: More Green Diodes Incoming!

Quote:
Originally Posted by Ezcal View Post
Looks like Sony's new top of the line video projector will be using green diodes, instead of DPSS green, like all previous laser projectors have been.

Now... What diodes do we think they're using, and what sort of impact might this have on our hobby?

I know we won't see anything like the Ca$i0 party we had - this projector will have a six figure price tag - but I'd like to think we might see some new sources (maybe even new diodes?) show up in the coming months.

Source: Sony 4K RGB Laser Projector at CinemaCon 2017 - AVSForum.com

Very interesting article. Thanks for sharing. I would like to watch a movie using that. And I think they have just 520 nm diode with more power and more advanced.


This seems to me interesting:
Quote:
Most of today’s RGB laser projectors use red and blue lasers, but the green component is generated by an infrared laser whose light passes through a special crystal that doubles the light’s frequency, generating narrow-band green light. Sony’s new RGB projector is among the first to use a direct green laser in addition to direct red and direct blue lasers.

...

Using direct red, green, and blue lasers will indubitably yield significantly superior color performance compared with other projectors, including 3P/6P RGB laser projectors in which the green primary is synthesized.

...
As I understand it, it says there is wider gammut with 520 nm, compared to 532 nm?

Check this:



I'm just interested, if we have subset of RGB using 520 nm green and a subset with 532 nm green (the same given blue and red wavelengths - I assume, of course they might use different, not stated in the article), it seems more colors can be made in blue-green area, but maybe slightly less in green-red region.

Considering technology, only certain colorspaces can be captured:



So, maybe the additional colors should have been added via computer graphics, what seems too complicated to me. Maybe the main reason is lowering complicated structure due to 523 nm laser, additional cooling and other stuff to reduce size and overall cost (at least in long term)? And which solution is wider in deed (not only on paper)?

Just asking, as it is interesting me.

I would be happy for any interesting reading recommendation on this topic of wavelengths, colorspaces etc. Especially (but not only) related to lasers.

Edit:
One more pic for context:
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Last edited by Radim; 03-31-2017 at 09:19 PM.
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Old 03-31-2017, 09:48 PM #5
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Default Re: More Green Diodes Incoming!

I seriously doubt that any new wavelengths laser diode has been created for the new Sony RGB laser diode projector.

The thing of note/breakthrough is that it is the first video projector to use a direct green laser diode.

At a least $100,000 and probably several hundred thousand dollars a small production extremely high end projector has no implications for laser pointer hobby people.

I would guess it uses a Nichia 1W 520 NDG7475 diode. It could be that a high power version of the Sony-Sumitomo 530nm 100mW green diode develped and shown in 2012 might be advanced to high power output and produced at some point in the future.
Right now with the Nichia diode available at low cost why spend the money to reinvent the wheel for a high priced low production volume unit.

Last edited by Encap; 03-31-2017 at 11:59 PM.
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Old 03-31-2017, 10:19 PM #6
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Default Re: More Green Diodes Incoming!

I found the polarization of the frames interesting for 3D as I had thought this had been accomplished some time ago. Years ago, when thinking of different ways to make 3D more viable I had thought of two ways that would improve it; mainly LCD lenses in glasses and vertical and horizontal polarization of the two images. I was certain that someone had already done this by now. At any rate, a nice presentation and thanks for bringing it here.
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Old 03-31-2017, 10:25 PM #7
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Default Re: More Green Diodes Incoming!

Quote:
Originally Posted by paul1598419 View Post
I found the polarization of the frames interesting for 3D as I had thought this had been accomplished some time ago. Years ago, when thinking of different ways to make 3D more viable I had thought of two ways that would improve it; mainly LCD lenses in glasses and vertical and horizontal polarization of the two images. I was certain that someone had already done this by now. At any rate, a nice presentation and thanks for bringing it here.
I was in deed. In lamp projectors (just try to tilt your head to experiment with polarization when you are next time in 3D cinema). However it was not used in laser projectors according to article, that's surprising.
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Old 04-02-2017, 01:26 AM #8
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Default Re: More Green Diodes Incoming!

Quote:
Originally Posted by diachi View Post
Interesting, although it may not benefit us any due to the probably very high price tag.
If it finds commerical application the price will probably come down significantly.

The 405 and 445 nm diodes were lab curiousities until bluray drives and projectors became consumer products too.

As for color rendering options: this is not really that important. I may look like a ver significant portion of the spectrum cannot be reproced, but these are not colours often found in real images.

What is currently 'missing' are really saturated cyan and green colours. These colours don't often occur in real life though, not even when looking at extremely green things like rice paddies and such.

What will help is to have a solid state green option that is less sensitive to operating temperature and things like that so it can be reliably used in a consumer product where you have little control over the operating conditions.
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Old 04-02-2017, 01:29 AM #9
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Default Re: More Green Diodes Incoming!

imagine we all go to the cinema and after the movie we walk up to the projector room and teardown the laser projector a part and extract the diodes and walk away
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