I thought Sony and JVC were using the same technology in their projectors, so why has JVC been able to get the native contrast significantly higher than Sony?

One more question. Why has JVC not used a DI yet? Are they planning on doing that?

Thanks.

Much technical stuff here (http://pro.jvc.com/prof/attributes/tech_desc.jsp?model_id=MDL101681&feature_id=02) - among other things new technologies minimizing light scatter/spillage help keep black levels down (in particular LCD molecular orientation and WireGrid optical engine)

Thanks for the link.

So the difference is due to incorporating those technologies, yet if we can read about them, is it a whole different story for Sony to do the same thing? Maybe patent issues, or manufacturing lead times?

Since we're reading about it, that almost always means it's been patented if patentable. Here's an example (http://www.freepatentsonline.com/EP1326123.html) from g**gling "patent wiregrid jvc"

I guess what I am really asking is what is likely to happen first: Sony figuring out how to get a native contrast as high as the rs-1, or JVC putting a DI on their units?