Quote:
Harpmaker wrote:
 Thanks for the reply Bill. I want to be clear that I'm not being argumentative either, really, I'm just trying to understand this correctly. 
Great treatise on iridescence! 
Perhaps Texas Instruments is simplifying the matter too much, but their explanation of how a single-chip DLP projector works ( http://www.dlp.com/tech/what.aspx ) says, in both text and graphic, that the DLP chip is struck by only red, green and blue light (the light that passes through the color filters on the color wheel), thus only red green and blue light hits our screens using such a PJ, and only one color at a time. It is the "persistence of vision" of our eyes that makes us see the full visible light spectrum. As I'm sure you know, it is the same phenomenon that lets us watch a CRT television without seeing the even and odd scan fields, but rather one image that doesn't flicker.
If what T.I. says is true, I don't understand how iridescence can come into play with such a PJ. 
You have MUCH more experience with this stuff than I do, and if you say iridescence is a problem I believe you.
The next time I have my PJ in my "lab" I'll do some testing and see if I can work this out so I finally "get it".  |
What they say is true but you have to keep in mind we see a complex image that is produced by the projector. In order to see the image and colors, mirrors are turned on and off to control the pixels, and the color wheel sends the light. To get a color other than red, blue, or green it rapidly passes light through different color segments. Our eyes combine it into the 'color'.
The reason I talked about iridescence was you asked about the prism effect of mica. I see what you were getting at now though.
I really don't think the type of screen you are talking about is feasable, and definitely not by any DIY means that I know of. I suppose a person could play with Red, Green, and Blue transparant films laid over top of each other, but I'm not sure how well that would work. Translating transparant sheets to a translucent paint would bext to impossible to control the outcome on our level.
Also it seems like this type of screen if it worked would be exclusive to DLP projectors would it not?
Might make an interesting thread if you want to start one up and check into it.