Back to bottom line, if a gray projector screen cost you $2000, definitely it is not just because screen color is changed from white to gray. Speaking from optical principle, I'm afraid there's a lot more behind. I'm guessing probably certain chemical compositions have been added to material of screen that changed reflection or absorption intensity of different wavelength of light, thus changed luster and contrast gradient of entire image, that, makes up inborn flaw of liquid crystal board after all. In addition to this, what other tricks do you think they can play? It doesn't seem to be possible with meager knowledge of physics that I have.

It sounds more like it to throw in a ¥15,000 screen if your projector cost you ¥15,000. But adding a ¥15,000 screen to a ¥15,000 projector doesn't make much sense at all. If I have to buy a ¥15,000 screen, then it would simply work better if I put money together and buy a ¥30,000 higher level projector to achieve better effect without any extra effort. A ¥15,000 screen is a crazy price to my brother-in-law (imagine his monthly income is merely ¥3000). Also if he buys a name brand Japanese gray screen, then he actually spend most of money to pay for labor.

The ideal screen for DLP projector that my brother-in-law purchased should be like a white wall, just let project light reflected completely without any "reservation". He figured that he really didn't need such costly screen. So he finally decided to make one on his own.

Exactly how did he do it? You may not believe how simple and inexpensive it really was! He spent a bit over ¥10 (about $1.50) in a home decorating store on a self-adhesive pure white matted formica panel PVC with dim grain, cut right size, pasted to his original background wall, that is it, flat and smooth! With such PVC screen, he doesn't need to worry about 'curl-up' phenomenon that may occur to a regular projector screen after around 12 years of use, he also doesn't need to worry that it would turn yellow one day due to natural oxidation. But remember it requires some pasting techniques to make it work perfectly for you. The result? Great! Here are couple of photos from him as 'evidence'.

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