Projector screens are typically divided into two sorts base on their functionalities: reflection projector display screen and transmission projector display screen. It may be additionally divided into mushy and exhausting display screen base on the supplies they’re created from.
Dwelling theater typically makes use of mushy reflection display screen. My brother-in-law initially wished to purchase a ¥1000 (~$150) so-called “import display screen”, however a buddy of his who sells projector screens informed him that it’s exhausting these days (in China) to differentiate the genuineness of an import display screen, it’s exhausting even for himself. A few of them which might be labeled with ‘import’ or ‘joint capital’ had been truly manufactured someplace within the south of China. He felt that he’d relatively to purchase a ¥300 domestically manufactured display screen with good emotions than purchase this type of “import display screen”. What this buddy stated makes excellent sense. However after doing a little analysis, my brother-in-law discovered that each one screens on the native market are created from excessive achieve Bolivian bead that’s used for projecting newspaper clips, they’re merely not appropriate for video frequency.
Theoretically talking, a white wall with one clean facet truly is the most effective “display screen”. As a result of its achieve is 1, that means that the sunshine projected might be fully mirrored out, which is a perfect state of being “no absorption, no achieve”. Sadly, for the aim of absorbing and proliferating the sound wave, he already made the wall a background wall with sound-absorbing materials and plywood put in. making it inconceivable to function a “projector display screen’, he needed to discover one other answer.
You is likely to be questioning at this level: why do folks nonetheless hassle buying costly screens if we are able to all use white partitions?
Properly, there are at all times advantages and benefits of utilizing knowledgeable display screen: handy, artistically stunning and dignified, good display screen can even make up the insufficiency of a projector and enhance visible impact. Among the many costly screens, one kind is “grey display screen” (price about ¥15,000, roughly $2000). This sort of display screen in all probability was initially designed for liquid crystal projectors. The largest downside with liquid crystal projector is that the colour seems darkish and gray, insufficiently calm. That is its “congenital defect” that’s brought on by its liquid crystal board and path of rays.
Relating to grey display screen, everyone knows that grey is merely a lighter black, and black absorbs all seen gentle. Grey can solely partially take up seen gentle, it’s like brightness of the image is decreased. You probably have used any image processing software program’s “brightness / distinction gradient” possibility, it’s best to actually have observed such phenomenon that decreasing brightness is equal to growing distinction gradient? Identical idea, for the reason that brightness has been decreased, it in flip elevated its distinction gradient. The black impact will get improved as a result of greater distinction. We will additionally expertise the identical impact after we look out by way of the sunshade glass of our automobile. The truth is, there are a lot of methods to simply scale back the brightness, you do not have to make use of grey display screen. There are magazines recommending placing the sunshine grey filter of a photographic digital camera to the projection lens, the precept is identical. You’ll be able to even use extra less complicated technique, specifically you should regulate the projector’s output brightness or improve the distinction gradient. No must spend a cent, you could obtain the same impact, however the premise is that showroom should be darkish sufficient.
Again to the underside line, if a grey projector display screen price you $2000, positively it’s not simply because the display screen colour is modified from white to grey. Talking from the optical precept, I am afraid there’s much more behind. I am guessing in all probability sure chemical compositions have been added to the fabric of the display screen that modified the reflection or absorption depth of various wavelength of sunshine, thus modified the luster and the distinction gradient of the complete picture, that, makes up the inborn flaw of liquid crystal board in any case. Along with this, what different tips do you suppose they’ll play? It would not appear to be attainable with the meager data of physics that I’ve.
It sounds extra prefer it to throw in a ¥150,000 display screen in case your projector price you ¥15,000. However including a ¥15,000 display screen to a ¥15,000 projector would not make a lot sense in any respect. If I’ve to purchase a ¥15,000 display screen, then it might merely work higher if I put the cash collectively and purchase a ¥30,000 increased stage projector to attain higher impact with none additional effort. A ¥15,000 display screen is a loopy value to my brother-in-law (think about his month-to-month earnings is merely ¥3000). Additionally if he buys a reputation model Japanese grey display screen, then he truly spend many of the cash to pay for the labor which he personally would not really feel snug.
The perfect display screen for the DLP projector that my brother-in-law bought ought to be like a white wall, simply let the mission gentle mirrored fully with none “reservation”. He figured that he actually did not want such expensive display screen. So he lastly determined to make one on his personal.
Precisely how did he do it? You could not consider how easy and cheap it actually was! He spent a bit over ¥10 (about $1.50) in a house adorning retailer on a self-adhesive pure white matted formica PVC panel with dim grains, lower the proper measurement, pasted to his unique background wall, that’s it, flat and clean! With such PVC display screen, he would not want to fret concerning the ‘curl-up’ phenomenon which will happen to an everyday projector display screen after round 12 years of use, he additionally would not want to fret that it might flip yellow in the future attributable to pure oxidation. However bear in mind it requires some pasting methods to make it work completely for you. The consequence? Nice!
Listed here are couple of self-made projector display screen photographs from my brother-in-law as ‘proof’:
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