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.

:worthless

Heh heh. :)

Sorry. See the bottom of this link, year 2000.

http://www.visions4.net/journal/time...a/page-four-a/

Fascinating set! That was not sold in the USA market, I am guessing.

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

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.

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.

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

Very cool indeed.

Thanks for posting. I feel like I should remember this, but I don't. I wonder how many they sold.

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.

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.

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.