LCCS Video Monitor: A Black and White TV... But in Color!
Added 2019-09-29 04:54:52 +0000 UTCThis is SO COOL! And it's a fairly quick topic, for once!
I never knew that the CBS color wheel system was... kind of anyway actually put into production! Here's a look at JVC's LCCS video monitor.
Comments
my guess is they used an RGB or CMY stack of dichroic dye LCDs.
nobody
2019-10-02 23:41:53 +0000 UTCWhat I really wonder is what's the principle behind being able to making the color filter, this seems impossible!
Kilrah
2019-10-01 20:19:29 +0000 UTCYeah that is common, even some DLP projectors use RGB leds instead of a color wheel now becasue of obvious cost/reliability benefits
Kilrah
2019-10-01 20:15:42 +0000 UTCSo is the CRT in LCCS monitor interlaced or progressive scan? It must be 3X the field/frame rate, right? Which means using phosphors with faster decay?
Retro Game Club podcast retrogameclub.net
2019-10-01 15:42:36 +0000 UTCThis is incredible! Thanks for doing what you do Alec. Also, your video backdrop wall is amazing.
2019-10-01 15:27:12 +0000 UTCI never knew this existed and it's freakin amazing! Great job, Alec!
Dave Pursley
2019-10-01 04:29:58 +0000 UTCMe too. It definitely looks like some kind of chemistry with the crystals doing chaotic things in the absence of electricity, but I'm not sure what's really going on. The look actually reminds me of this chemical reaction https://www.youtube.com/watch?v=LL3kVtc-4vY
2019-09-30 23:37:18 +0000 UTCSomething's up with the audio. It doesn't sound nearly as clear as usual. I realize I'm too late to prevent it from showing on the main channel, but hopefully I can still prevent the mistake from persisting.
Tim Derks
2019-09-30 17:44:14 +0000 UTCI think I need to up my pledge. The level of engineering depth in these videos is wonderful.
Marlo Delfin Gonzales
2019-09-30 16:39:17 +0000 UTCThe basic premise of that was to sequence the Left / Right shuttering of 3D glasses with the colour sequence of the projector, to increase the apparent shutter rate, and massively reduce the flicker. It actually worked very well, but had to be set up for the different colour wheel segments for each model of projector, and obviously the speed the wheel spins at. One of the slight issues with it was that the more modern DLP projectors tend to spin the wheel at a faster multiple, so the 3D shutter rate actually became too fast for the poor LCD shutter glasses to keep up. lol
ElectronAsh
2019-09-30 16:11:04 +0000 UTCYes, it is possible to remove the colour wheel on most DLP projectors. The reason you have to have the motor hooked up on most of them is for the Index pulse. But, on some DLP projectors, you can simply spoof the pulses that the sensor (or motor driver) normally generates. One of my very first FPGA projects was for a "Colour Wheel Replacer", which sequenced high-power RGB LEDs in time with the original wheel segments. It hooked up to the serial pins of Allegro motor driver chip that was commonly used on many projectors of the time. I then just had a counter in the FPGA which counted from 0 to 359, to simulate each "degree" of the wheel. There are some other nice tricks you can do with sequential colour systems. ;) https://www.mtbs3d.com/phpBB/viewtopic.php?f=3&t=5458
ElectronAsh
2019-09-30 16:07:13 +0000 UTCThought I'd found the monitor Alec bought, but his has a different serial. lol Whoever bought it got a bargain, though. We rarely see anything like this as cheap on eBay UK... https://www.ebay.com/itm/JVC-LCCS-Video-Monitor-TM-L450TU-/254357753562?nma=true&si=y2yYN4b7qYb82aZaeIWoFbUHfsc%253D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557
ElectronAsh
2019-09-30 16:00:37 +0000 UTCMikeselectricstuff did a video where an energy monitor used a display tech that was nearly the reverse of this. The image was formed by an inexpensive monochrome LCD panel, and an LED backlight changed color behind it. (different mike, for the record) https://www.youtube.com/watch?v=q1LvleZcJm0
nobody
2019-09-30 15:30:43 +0000 UTCYou know that phenomenon in the early 2000s when CD drives were reaching 52x speeds and discs were shattering? Imagine the shrapnel coming out of a huge glass colour wheel! Might even take the picture tube out with it...
2019-09-30 15:03:26 +0000 UTCThose Tektronix colour oscilloscopes are pretty common, it's just they're super expensive on the used market because they are specialised equipment and they tend to hold their value very well.
2019-09-30 14:59:17 +0000 UTCIs the "circles" random, when the power is removed? That's so weird!
2019-09-29 23:38:04 +0000 UTCThe technology seems pretty logical for oscilloscopes, if they are multichannel, using alternate scanning, then change the color for each scan. I see the usefullness there for Tektronix. Would be cool to try to get one of these oscilloscopes ;-).
MrHammond
2019-09-29 18:24:42 +0000 UTCThat is amazing! I never knew!
2019-09-29 17:03:35 +0000 UTCI would be interested to know what causes the “spotting” artifacts after power is turned off to the monitor.
Sean Hearrell
2019-09-29 16:06:54 +0000 UTCthat color is super accurate too
TNSheep
2019-09-29 13:29:34 +0000 UTCVery nice, love the obscure video products, You’re doing an excellent job!
2019-09-29 13:18:28 +0000 UTCThe opposite of this is also true. Take a DLP projector, remove the color wheel (actually, that does not quite work, you need to break the glass off it and replace the wheel itself) and, pronto, the best, brightest B&W projector ever, for watching B&W movies without rainbow or dimming side effects. A surplus, older, not so bright DLP works perfectly fine for this purpose.
2019-09-29 07:11:44 +0000 UTCWhen I first heard about the CBS color wheel, I couldn't shake the thought that it would have to spin at some ridiculously high rpms in order to make a decent picture, especially with a larger screen. The idea of a disc about 3 or 4 feet in diameter spinning at 3,000 rpm in your living room just seems like it would be noisy and dangerous, especially with 1950's technology.
Mark Hesse
2019-09-29 05:55:40 +0000 UTCOmg the TMNT meme so good 😆
briandef
2019-09-29 05:18:23 +0000 UTC
