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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Wed Apr 20, 2016 9:58 pm Post subject: |
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Light pipes from the lamp to the imaging device? That's been done before. AmPro Eidophor AE-12 light valve projector. 12,000 lumens, the lower chassis was just the power suply and lamphouse for the 5 KW Ushio arc lamp.
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xmob135lc
Joined: 15 Sep 2012
Posts: 80
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| Posted: Fri Apr 22, 2016 12:10 pm Post subject: |
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I just thought housing HVPS elsewhere, or , if you really want a completely new CRT (and like, per pixel dimming) perhaps get rid of the HVPS altogether using a different electron source.
Rear screens for plasma replacement can be >5 gain , because of less tinted surface.
I think the last and widest ( 92" ) Mitsubishi DLP telly was a 4-5 perhaps even 6 gain screen, it's grey in daylight.
https://www.youtube.com/watch?v=YKId_MxoQaY
https://www.youtube.com/watch?v=5VeASk9gPLQ
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donaldk
Joined: 17 Jun 2008
Posts: 308
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| Posted: Fri Apr 22, 2016 4:19 pm Post subject: |
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Xmob I saw that Prysm is more or less out of the LASER-Phosphor Display business, moving mostly to the cheaper LG 98" 4K LCD panels. Pitch not fine enough for small surface of small CRTs.
Guys you know Scott posted the last 12 unit run back in 2012.
I haven't seen him post on AVS (haven't been here in a while:-( ) in a few years, so did VDC quietly retire him, together with the Marquees?
Just push for a affordable 6P RGB LASER projector. Seems Sim2 re-directed attention away from it, as it still isn't here, well the small 3P unit. Chinese LASER engine partner offers units for sale, but only 10K lumens (need contrast mods) not the promised 20K lumens.
At NAB Christie showed 1000000:1 Rec. 2020. Well beyond CRT capabilities, even in FANtasy.
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xmob135lc
Joined: 15 Sep 2012
Posts: 80
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| Posted: Fri Apr 22, 2016 5:15 pm Post subject: |
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| donaldk wrote: | | Xmob I saw that Prysm is more or less out of the LASER-Phosphor Display business, moving mostly to the cheaper LG 98" 4K LCD panels. |
That wasn't even a true laser display but a galvo scanner and RGB phosphors, and it has nothing to do with CRT projectors (no need for vacuum with UV laser), such installation stuff needs to have good viewing angles, high gain rear projection is not suitable for that. Besides it's hardly the first time we see a supposedly bleeding-edge proprietary solution provider settling on run-of-the-mill stuff.
| donaldk wrote: | | Pitch not fine enough for small surface of small CRTs. |
Not true, see : http://lcd.creol.ucf.edu/paper/SID02_1084.pdf
Well, for example the (true laser) LaserVue DLP-s had very dark tinted screens, that can boil away a lot of laser output. Still, that was pseudo-FullHD and no per-pixel-dimming, but per-subframe at most (makes you think if they even had per-subframe-dimming all that much when they had to do the spatial wobulation too).
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Fri Apr 22, 2016 7:10 pm Post subject: |
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| donaldk wrote: |
Guys you know Scott posted the last 12 unit run back in 2012.
I haven't seen him post on AVS (haven't been here in a while:-( ) in a few years, so did VDC quietly retire him, together with the Marquees?
At NAB Christie showed 1000000:1 Rec. 2020. Well beyond CRT capabilities, even in FANtasy. |
I haven't spoken to Scott in years. He is in his mid to late 50s, so anything is possible. I do remember him saying that he hadn't worked on a CRT since like '09. He moved over to working on digital along with the rest of VDC. I recall him being especially proud of the BFI work on their LED DLP to enhance motion resolution. I wouldn't mind grabbing one of those if it comes up in surplus.
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donaldk
Joined: 17 Jun 2008
Posts: 308
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| Posted: Fri Apr 22, 2016 9:59 pm Post subject: |
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Xmob laservue did not exite phosphors on 15cm wide surface area.
How is this: "a different electron source", the Chinese came up with a traditional but better performing electron gun.
I thought he would be older as he started in CRT projector development well over 30 years ago. But that was only based on him working at Ampro and predecessors.
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xmob135lc
Joined: 15 Sep 2012
Posts: 80
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| Posted: Sat Apr 23, 2016 3:57 am Post subject: |
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| donaldk wrote: | Xmob laservue did not exite phosphors on 15cm wide surface area.
How is this: "a different electron source", the Chinese came up with a traditional but better performing electron gun.
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Prysm wasn't ever a CRT I bet they'd hate the comparison because they seemed to idolize efficiency, and the epitaph for CRT by the sanctimonious type of persons was un-efficiency (that's nice attention seeking act btw , takes a true narcissist  ). Anyway, it's even more of a fixed pattern than monitors (hundreds of stripes). I described continuous phosphor area for every color and DLP chip with 90% fill factor , that's hardly non-continuous like a monitor or the galvo scanner addressed phosphor stuff (besides it seems like they hit the ceiling when they had to modulate a single laser for all three colors and it had to be high powered too, no wonder they had to use so many "tiles" ). Compared to OLEDs , plasma is much more continuous , and DLP is again , then there are CRT projectors that are a bit too continuous , since the pixels tend to overlap.
Besides the 1 million contrast DLP , even though that's again, installation stuff (where it's paramount to have good viewing angles) hardly changes the fact that they use laser light source as an efficient continuous/stray light generator, for that to hit such number a you have to literally dump a lot of the continuous/stray light and forget about motion resolution , all this because there are no commercial high gain screens, and even in that case, you can't use them for installation stuff. So you need some 4x-6x light output just to compensate for lack of high gain screen...
There are lot of different electron source designs now, though most can be traced to before 21th century, a very few are truly new.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Sat Apr 23, 2016 7:31 pm Post subject: |
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If you want to talk about ultimate display technologies, a 4K or higher OLED panel is probably about it. Sized as big as you want it and it can fit in your home theater. Printed on a flexible substrate but rigid enough that it needs no unusual means of support.
And that's an existing product...except for the size factor. They're available in a variety of sizes but I don't think they make them in a 20 foot wide version yet, for the larger home theaters.
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xmob135lc
Joined: 15 Sep 2012
Posts: 80
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| Posted: Sat Apr 23, 2016 8:24 pm Post subject: |
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Active matrix oled needs multiple transistors per subpixel besides the usual stuff that can go wrong, eg. emitter burn-in. Besides the funny unlimited contrast claim comes with the worst fill-factor, not sure that's all that cool.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Sat Apr 23, 2016 8:38 pm Post subject: |
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They can make LED matrices with a fill factor approaching 100 percent if they want to. The future will favor an OLED type solution.
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xmob135lc
Joined: 15 Sep 2012
Posts: 80
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| Posted: Sat Apr 23, 2016 9:29 pm Post subject: |
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| cmjohnson wrote: | | (...) The future will favor an OLED type solution. |
...sounds like one hell of a quixotic world!.. 
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Sat Apr 23, 2016 11:53 pm Post subject: |
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| donaldk wrote: |
I thought he would be older as he started in CRT projector development well over 30 years ago. But that was only based on him working at Ampro and predecessors. |
I don't recall his history exactly, but I believe he started working on CRTs in the early to mid 80s.
I don't think he has posted much, but I do believe some have corresponded with him through email and PM in the recent past.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Sun Apr 24, 2016 2:10 am Post subject: |
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Yes, Scott is still working for VDC.
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