P3D Re: Liquid Crystal Shutters

[Andrew Woods <andrew@xxxxxxxxxxxxxxxxxxxxx>]

Date: Thu, 04 Mar 1999 00:50:47 PST
Bart Kelsey wrote:
> I am currently attempting to source four Liquid 
> Crystal Shutters with dimensions of approximately 2 inches square (50 mm 
> x 50 mm) for use in a research project.The quality must be such to 
> achieve a high extinction factor when opaque and fast shuttering at up 
> to 70 Hz. 

StereoGraphics is the only company I know which routinely sells reasonably
large LC cells.  I was in the unfortunate position of breaking one of
the cells in my Crystaleyes glasses about two years ago - fortunately I
was able to buy a replacement cell from StereoGraphics to get the glasses
working again.  It seems they sell the replacement cells quite routinely.

The replacement cell I bought was about US$70 and had the following
dimensions:  
                    57mm
          +-------------------+
    29mm  |                   |
          |                   |
          |                   | 45mm
           \                  |
            \                 |
             \                |
              ----------------+
                    43mm

These measurements describe the active area.  The cutout is for the nose.
Apparently the newer style glasses use a cell which doesn't need the cutout.
Anyway, StereoGraphics may be your easiest option.

If you do find an alternative, I'd like to know.

> The LC control/drive aspects are likely to be addressed by 
> help sought from the physics department.

I have a circuit which could drive these or other LC cells.  Contact me
off-list if you'd like more info.

Cheers,
Andrew.

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