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it's an interesting idea. We do have design for having two controlers interface to DMDs, but our controller cannot talk to 2 DMDs at the same time. It's for bandswidth, mainly for cost issue.
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In reply to Frank Xu:
In reply to dus java:
The concept here is not new. Somebody has done it before. DLP Cinema has taken this approach before and indeed showed very impressive contrast. However, For mainstream applications, it is too expensive (2 dlp chipsets + optics) and too inefficient (~68% efficiency per dmd) to be practical.
The two DMD approach you mentioned is actually built into product by Zeiss planetarium http://www.zeiss.com/planetariums/en_de/products/products/velvet.html.
Any customer would like to have this design, we certainly will support it.
By all means, I want a consumer two-chip DLP to become a reality. As Dus Java pointed out it's a much more efficient upgrade to a DLP than basically everything else including a change of a light engine (LED, laser). Like was already pointed out it's a win-win situation for everybody. Frankly speaking, without this upgrade I can't see how DLP can compete with LCoS projectors in the middle price market (2500$-8000$) in the nearest future.
In reply to Elix Berd:
I first thought two DMD's in series would be too complex/expensive because of the off-axis light path, but might it be as simple as 45 deg bounces off of two DMD's that are 90 deg from each other, with the rest of the optical path the same as before?
I'd love to have a DMD projector for the simplicity and robustness, but the contrast just doen't cut it; I'm on my third JVC for
The new JVC's with dynamic iris give real-world contrast >100k:1 which really puts the nail in the coffin for DLP for me.
I'm surprised to hear DMD's have only 68% reflectivity; is that typical or does something about using two lower it?
In reply to Noah Katz:
Another thing: I wonder how close to squaring the CR (contrast ratio) two DMD's would actually give.
I've long wondered how much of the CR is determined by diffraction off of the mirrors' edges, i.e. what would the CR be if the rest of the light were perfect.
Frank, are you able to share that info?
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