Projector screens are generally divided into two types according to their functionalities: reflection projector screen and transfer the projector screen. It can also screen for soft and hard, on the basis of the materials are made, broken.

Home theater generally uses soft reflection screen. My brother-in-law had originally decided to buy a ¥ 1000 (~ $ 150), the so-called "single-screen, but a friend of his who sells projector screens told that it is hard nowadays (in China) to distinguishthe authenticity of an import screen, it is difficult, even for themselves. Some of them, the import of 'A' or 'mixed' actually manufactured somewhere in southern China. He felt that he would buy more domestic production of a ¥ 300 screen with a good feeling to buy that sort of "import screen". What this friend has a meaning. But after some research found out that my brother-in-law that all monitors for the local market are made with high gain Bolivian bead thatis used for the screening of newspaper clippings, are simply not suitable for video frequency.

Theoretically, a white wall with a smooth side is truly the best "image." Because its gain is reflected 1, which means that light can be projected in full what the ideal state of being is no absorption, no gain. "Unfortunately, for registration and the spread of the waves of sound, already has a wall with sound-absorbing material and plywood wallinstalled. the inability of an 'image-projector, "should find another way to serve.

One might ask at this point: Why do people still bother purchasing expensive screens if we can use all the white walls?

Well, there are always benefits and advantages of using a professional screen: convenient, artistically beautiful and dignified, good screen can also be an adequate provision of a projector, and to improve the visual effect. Among the expensive screens, is a kind of"gray screen" (cost about 15,000 yen, about $ 2000). This kind of screen probably was originally developed for liquid crystal projectors. The biggest problem with liquid crystal projector is that the color appears dark and gray, not quite quiet. This is the default "birth", which by its board LCD and the path of the rays occurs.

Know what gray screen, we all know that only a lighter gray black and black absorbs all visible light. Gray only partially absorb visibleLight, is like the image brightness is reduced. If you noticed some image processing software uses gradient Brightness / Contrast "option, you must in any event, a phenomenon that reducing brightness is equivalent to increasing contrast gradient? The same concept, because the brightness was reduced, he in turn will increase the gradient of contrast. The effect is enhanced by the contrast more black. We can also experience the same effect as when we made theSunshade glass of our car. In fact, there are many ways to reduce only the brightness is not necessary to use gray screen. There are magazines recommending filter gray light of a camera placed the projection lens, the principle is the same. You can even simpler method, namely that you need to increase the power of the projector to adjust the brightness or contrast gradient. No need to spend a penny, you can achieve the same effect, but the premise must Showroomrather dark.

Back to the bottom line, if a gray projector screen costs $ 2000, and in any case, not only because the color on the screen changes from white to gray. Speaking from the optical principle, I fear, there's more. I suspect, probably some chemical compositions have been the material of the screen and the intensity of the reflection or absorption of various wavelengths of light, thus changing the brightness and contrast of pitch has changed the whole image ,which is the inborn errors of liquid crystal display landed. Also, what other tricks you can play them? It does not seem possible, with the knowledge of physics, thin, I have.

Sounds more like a throw ¥ 150,000 screens when the projector will cost ¥ 15,000. But the addition of a ¥ 15,000 screen to ¥ 15,000 projector does not make much sense. If I buy a ¥ 15,000 screen, then it is better if I want the money and would¥ 30,000 higher purchase a projector to get a better effect, without additional effort. A ¥ 15,000 screen is a crazy price to my brother-in-law (imagine his monthly income is only ¥ 3000). Even if he buys a brand Japanese gray screen, then actually spend most of the money for the work they do not pay a person to feel good.

The screen is ideal for the DLP projector that my brother-in-law to be purchased, like a white wall, letting the reflected light of the projectwithout a "reserve". He thought he really did not need such costly screen. So finally decided to do one for her.

Just as he did? You can not believe how easy and inexpensive it really was! He spent some 'decorative ¥ 10 (about $ 1.50) in a shop house on a pure white matt self adhesive PVC Formica panel with dim grains, cut the right size, pasted to the wall of his original background, which is flat and smooth! With such PVC screen, he seesmust have the curl-up "phenomenon that occurs on the screen of a normal projector after about 12 years of use, concern has also been afraid that one day they would again yellow of natural oxidation. But remember, does not require ' inclusion of certain techniques for the perfect job for you. The result: Great!

Here are a few self-made projection screen shots of my brother-in-law, as"Evidence"

http://www.news-blogs.com/_images/entertainment/diy_screen.jpg

http://www.news-blogs.com/_images/entertainment/diy_screen2.jpg

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