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Old 01-23-2015, 04:04 AM #17
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Default Re: Yellow Cyan ShowWX+ display?

This has nothing to do with the yellow subpixels Tv's that came out a few years back.
(Which BTW i agree with you both of you about.)
This is very different.

And let me explain RHD why the choice of wavelengths so there will be no confusion.
I own 5 showwx+ models.
Some have different wavelengths because some were made by Intel and some by Microvision.
My 442nm blue can not do royal blue or true blue and instead does a purplish blue.
My 450nm does true royal blue.

And although the red and blue laser wavelength variations have little impact on gamut color they do with overall precived brightness.

In the wavelength region of red for instance, luminous efficiency rapidly increases as the wavelength shortens.

Current red laser diodes used in the older showwx+ display engine lase at 642nm. By moving towards the shorter wavewavelegth, even by a mere 4nm the human eye perceives this red light as being much brighter. In this case, at fixed brightness, red light at 638nm appears about 33% brighter than the same light output at 642nm.

Similarly, the blue laser diode being used in the previous version of the wx + emitted light at 442nm. By increasing the wavelength to 450nm, precived brightness would also increase. That is why I have included 6 of those specific wavelengths in my monitor setup.
Then you have the overall brightness increase by using 7 lasers instead of 3.
(Side note: I would love a 405nm 3.8mm laser to add in the mix but cant as I don't think they make one that can modulate as fast as the ones made by Osram that go in the showwx+ .

The 7 color laser display I am building will still look better at color reproduction than any other display when you take these things into account.
(Read post number 5 in this thread)

By the way RHD, did you ever get the green laser working outside the projector at full power? I was curious to know if you messed with it anymore since you posted about its while back. (I was wanting to use these lasers as a cheap method for making color holograms since they don't mode hop and have long coherence.)

I hope this cleared some things up.



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Old 01-23-2015, 04:31 AM #18
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Default Re: Yellow Cyan ShowWX+ display?

I agree that 442nm isn't gaining much gamut; there's not much separating them on a YUV chart. 450nm to 442nm provides a tiny sliver of additional gamut that adult eyes probably can't even distinguish anyway because of the yellowing of the eye lenses. 450nm and 405nm will cover more area, but the eyes' sensitivity to 405nm is so low that you really can't produce good colors anyway unless the other channels are quite dim. It's only bright when it fluoresces on surfaces which could throw off the color.

Those wavelengths at the edges of the human color response curve are all squashed together, and concentrating on wavelengths that really spread out the color-space (like 488nm) do a better job. Separate yellow channels are absolutely pointless if you have a 532nm source, and only less so if you have a 515nm. Yellow is almost perfectly covered by red and green blending, whereas adding cyan at least fills a gap.
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Old 01-23-2015, 06:08 AM #19
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Default Re: Yellow Cyan ShowWX+ display?

Quote:
Originally Posted by Bionic-Badger View Post
Those wavelengths at the edges of the human color response curve are all squashed together, and concentrating on wavelengths that really spread out the color-space (like 488nm) do a better job. Separate yellow channels are absolutely pointless if you have a 532nm source, and only less so if you have a 515nm. Yellow is almost perfectly covered by red and green blending, whereas adding cyan at least fills a gap.
Yes! Thank you Bionic Badger! Someone understands.

Really I have had to repeat myself alot in this thread. If those of you that respond would just take the time to read the entire thread before you post a comment it would save all of us alot of time. (lol)
Read post number 5 again. It covers the advantages already and the fact that i do have cameras that utilizes a red green blue cyan Bayer filter pattern on a cmos that WOULD benefit from this display tech.
Not to mention being able to display ProPhoto RGB: most of the visible color gamut, 13% of the colors are imaginary or impossible.
L*a*b* colorspace: 100% of visible colors, with lots of impossible colors.
And others.
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