[Wear-Hard] Heavy MyVu Crystal Modifications

[Brian Kuriyama]

Sorry to break it to you, but the Myvu board definitely seems like their own
original creation. They're using the specific chip who's datasheet I linked
too, but the driver board is extremely packed and looks incredibly hard to
modify for dvi input. You would have to remount the package onto your own
custom board if you decided to go that route im afraid. Also, I don't
believe the driver chip is capabale of taking a raw S-Video signal. It would
need to be re-combined back into composite sadly.

-Brian

On Sat, Jun 13, 2009 at 9:46 PM, Olli Markkanen <olli.markkanen at gmail.com>wrote:

> 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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