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  #1  
Old 10-26-2014, 09:58 AM
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etype2 etype2 is offline
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Found a modern day field sequential color tv

Thought the members may be interested. Found a television that uses a 4.5 inch monochrome CRT as the image source. It produces a full color image with RGB liquid crystal filters that turn on and off sequentially. It uses field memory kinda like the old spinning color wheel concept but done electronically.

When viewing, it has high resolution. It has no phosphor pixels, dots or stripes. All you see is the barely visible scanning lines from the black and white CRT. Produces a very smooth unbroken color image.
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Old 10-26-2014, 10:06 AM
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Heh heh.
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Old 10-26-2014, 10:19 AM
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Sorry. See the bottom of this link, year 2000.

http://www.visions4.net/journal/time...a/page-four-a/
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Old 10-26-2014, 08:51 PM
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Fascinating set! That was not sold in the USA market, I am guessing.
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Old 10-26-2014, 10:17 PM
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It appears to be a consumer application of the Tektronix Liquid Crystal Color Shutter (LCCS), introduced in the early 90s:

http://www.electronicproducts.com/Te...bandwagon.aspx

1986 patent: http://www.google.com/patents/US4582396

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Last edited by jr_tech; 10-26-2014 at 10:24 PM. Reason: add patent link
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Old 10-27-2014, 06:37 AM
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Quote:
Originally Posted by ChrisW6ATV View Post
Fascinating set! That was not sold in the USA market, I am guessing.
It was sold to the professional market. My set has a built in NTSC tuner for VHF/UHF and it will decode PAL for the Euro market. If you Google the model number, you can find the complete owners manual. There were rack mount and field accessories.
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Old 10-27-2014, 06:44 AM
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Originally Posted by jr_tech View Post
It appears to be a consumer application of the Tektronix Liquid Crystal Color Shutter (LCCS), introduced in the early 90s:

http://www.electronicproducts.com/Te...bandwagon.aspx

1986 patent: http://www.google.com/patents/US4582396

jr
Interesting, thanks for the info.

I called JVC and they sent me the complete service manual with schematics, exploded views, circuit boards and parts list. The set has 7 circuit boards, 43 IC's. I see a video processor, micro controller, video decoder and ASIC scan field converter 1X to 3 X. There must be tremendous switching going on and a built in fan activates when I switch on the power.

This set retailed for far less then the Textronic. I got it for a song. Don't think the seller new what he had or thought it was an antiquated.
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Old 10-27-2014, 12:55 PM
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This set retailed for far less then the Textronic. I got it for a song. Don't think the seller new what he had or thought it was an antiquated.
But remember, the Tektronix application was very high performance digital oscilloscopes (BIG$$$) not television monitors.... Here is one on the 'bay:
http://www.ebay.com/itm/Tektronix-4-...item33925d996b

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Old 10-27-2014, 06:05 PM
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But remember, the Tektronix application was very high performance digital oscilloscopes (BIG$$$) not television monitors.... Here is one on the 'bay:
http://www.ebay.com/itm/Tektronix-4-...item33925d996b

Not affiliated,
jr

Agreed. Here is the JVC press release: http://pro.jvc.com/pro/pr/nab/tml450tu.htm
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Old 10-27-2014, 08:21 PM
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Very cool indeed.
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Old 10-27-2014, 10:23 PM
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Thanks for posting. I feel like I should remember this, but I don't. I wonder how many they sold.
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Old 10-30-2014, 02:31 PM
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I posted a video today showing the JVC LCCS in operation.

http://m.youtube.com/watch?v=S5RChk3...ature=youtu.be

Excuse the commercial or skip over it.
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Old 10-30-2014, 02:50 PM
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If I am understanding this correctly, the LCD doesn't reproduce any video - it is acting as a replacement for the spinning color wheel. Would this be the correct assumption?
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Old 10-30-2014, 03:34 PM
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Originally Posted by crtfool View Post
If I am understanding this correctly, the LCD doesn't reproduce any video - it is acting as a replacement for the spinning color wheel. Would this be the correct assumption?
Yes. The three filters, RGB are being switched on and off sequentially according to video signal stored in field memory. They are located in front of the monochrome CRT. The switching is so fast that the eye sees a single color image.
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Last edited by etype2; 10-30-2014 at 03:38 PM.
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Old 10-30-2014, 06:12 PM
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The switching is so fast that the eye sees a single color image.
Yes, I understand this part - Persistence of Vision. But this is true of all television and motion picture images.

Since the Screen is relatively small, and the CRT is hidden behind the LCD Panel - I would think that it would almost look as clear as watching projected film.
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