[Wear-Hard] Heavy MyVu Crystal Modifications

[Olli Markkanen]

Hi,

I'm a lurker on this list and I am building my own wearable. Currently I'm
ordering the parts, BeagleBoard, Myvu Crystal and things for the
Spiffchorder.

I also, just this friday, was digging the datasheet which I got from Kopin
webpage, the display is from Kopin and I hope the Driver board is their too
and not some Myvu original thing.
So I noticed it takes either that S-video/Composite signal, or bare digital
signal if rewired. It should not be too hard to hack. BeagleBoard gives
dvi-d signal, so that's what I hope to be able to feed the Crystal. If we
just could confirm this and get a how-to on the web, it would be nice.

Man, this list thingy is weird. Is there/why is there not something like
irc-channel for wearables? There is a newish wiki on wearcomp.wikia.com, but
it still does not have too much content.

Olli Markkanen


2009/6/13 Brian Kuriyama <yosh.five7 at gmail.com>

> Crap, Accidentally hit the send button, my last email wasn't finished,
> here's the complete one:
> -------------------------------------------
> So, I was wondering how ballzy people here are. If they rip apart several
> hundred (if not potentially thousands) of dollars worth of displays to build
> their equipment, whats another $300 right?
>
> So, my UX's retarded Intel GMA950 chipset will not output to "TV out" and
> VGA output at the same time, if I wanted to add my HMD as a 4th screen to
> the setup without disabling my 22inch, I would need to use a USB to VGA
> adapter of sorts. Problem is, my display controller only takes composite
> video *natively*! And that's where a little digging began. I remember
> working with Kopin's display drivers before and I know they don't skimp on
> functionality. Especially for a display as useful as a full color VGA one!
>
> While looking up the driver chip found in my MyVy Crystal headset, I came
> across the datasheet for it!!!
> http://www.kopin.com/data/SSD1502.pdf
>
> What's awesome is that it notes under 'Features":
>
> Digital input formats:
> -  NTSC and PAL video (support rectangle and square pixel variants)
> -  BT656, with sync information in SAV/EAV blocks (8-bit words @ 27MHz)
> -  4:2:2 YCbCr (8-bit words @ 27MHz or 16-bit words @ 13.5MHz)
> -  16-bit RGB (5,6,5) @ 13.5 MHz
> - VESA VGA video
> -  480p RGB/YCbCr with separate sync signals which Hsync, Vsync and Pixel
> clock (Pclk) (24-
> bit words @ 25-36MHz).
> -  Serial wire interface for YCbCr video input source
>
> While I haven't gone too much into the specifics for it yet, it appears
> that it shouldn't be too difficult to rewire the controller, or make a
> separate board for the chip to take a VGA signal. Even if the driver doesn't
> take VGA natively, I'm sure one of the Philips video decoders do!
>
> The problem with this approach is that not only is reballing and remounting
> BGA packages like the one found in the MyVu controller extremely difficult,
> but there is no application circuit to copy and figure out how exactly this
> chip will respond to our/my intended setup. This looks like an extremely
> useful driver for a display, and despite the somewhat difficult
> documentation, If we were able to source these, we could possbily have very
> interesing display controllers produced, specifically tailored to wearable
> applications!
>
>
> Just an idea~
> -Brian
>
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>
>
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