Homemade Projector Screen - The Principle & How to DIY

Projector screens are generally divided into two types base on their functionalities: reflection projector screen and transmission projector screen. It can be also divided into soft and hard screen base on the materials they are made from.

Home theater generally uses soft reflection screen. My brother-in-law originally wanted to buy a 1000 (~$150) so-called "import screen", but a friend of his who sells projector screens told him that it is hard nowadays (in China) to distinguish the genuineness of an import screen, it is hard even for himself. Some of them that are labeled with 'import' or 'joint capital' were actually manufactured somewhere in the south of China. He felt that he'd rather to buy a 300 domestically manufactured screen with good feelings than buy this kind of "import screen". What this friend said makes perfect sense. But after doing some research, my brother-in-law found that all screens on the local market are made from high gain Bolivian bead that is used for projecting newspaper clips, they are simply not suitable for video frequency.

Theoretically speaking, a white wall with one smooth side actually is the best "screen". Because its gain is 1, meaning that the light projected can be completely reflected out, which is an ideal state of being "no absorption, no gain". Unfortunately, for the purpose of absorbing and proliferating the sound wave, he already made the wall a background wall with sound-absorbing material and plywood installed. making it impossible to serve as a "projector screen', he had to find another solution.

You might be wondering at this point: why do people still bother purchasing expensive screens if we can all use white walls?

Well, there are always benefits and advantages of using a professional screen: convenient, artistically beautiful and dignified, good screen can also make up the insufficiency of a projector and improve visual effect. Among the expensive screens, one type is "gray screen" (cost about 15,000, roughly $2000). This kind of screen probably was originally designed for liquid crystal projectors. The biggest problem with liquid crystal projector is that the color appears dark and grey, insufficiently calm. This is its "congenital defect" that is caused by its liquid crystal board and path of rays.

Regarding gray screen, we all know that gray is merely a lighter black, and black absorbs all visible light. Gray can only partially absorb visible light, it is like brightness of the picture is reduced. If you have used any picture processing software's "brightness / contrast gradient" option, you should certainly have noticed such phenomenon that reducing brightness is equivalent to increasing contrast gradient? Same concept, since the brightness has been reduced, it in turn increased its contrast gradient. The black effect gets improved due to the bigger contrast. We can also experience the same effect when we look out through the sunshade glass of our car. In fact, there are many ways to just reduce the brightness, you don't have to use gray screen. There are magazines recommending putting the light gray filter of a photographic camera to the projection lens, the principle is the same. You can even use more simpler method, namely you need to adjust the projector's output brightness or increase the contrast gradient. No need to spend a cent, you may achieve the similar effect, but the premise is that showroom must be dark enough.

Back to the bottom line, if a gray projector screen cost you $2000, definitely it is not just because the screen color is changed from white to gray. Speaking from the optical principle, I'm afraid there's a lot more behind. I'm guessing probably certain chemical compositions have been added to the material of the screen that changed the reflection or absorption intensity of different wavelength of light, thus changed the luster and the contrast gradient of the entire image, that, makes up the 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 the meager knowledge of physics that I have.

It sounds more like it to throw in a 150,000 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 the 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 the money to pay for the labor which he personally doesn't feel comfortable.

The ideal screen for the DLP projector that my brother-in-law purchased should be like a white wall, just let the 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 PVC panel with dim grains, cut the 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 the '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 self-made projector screen photos from my brother-in-law as 'evidence':
www.news-blogs.com/_images/entertainment/diy_screen.jpg
www.news-blogs.com/_images/entertainment/diy_screen2.jpg

Note: You may freely republish this recipe as long as author bio and active hyperlinks are kept intact. Thank you.

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Have a Splash at Your Summer Pool Party!

Its summertime and you want to have a party with your friends. Even better, you have a pool! Following are some great tips for organizing a pool party.

The first thing to do is invite all of your friends and relatives. Use postcards or invitations purchased from a party supply store. They will have pool party themed everything for you to choose from.

A party planner from the party supply store will also assist you if you have questions or need guidance. They offer every paper product necessary, such as plates, cups, napkins and silverware. Buying paper products makes for a quick and easy clean up so you can enjoy the party yourself!

The party supply store will also have decorations to add ambience to your pool themed party. They will carry personalized banners if your pool party is for a birthday, a retirement or summer holiday. Balloons and streamers of every color can be found to match your theme too. If the party will last into the night, add outdoor lights around a deck or fence. Make them twinkle and it will seem like a million stars are out.

Games to play at a pool party include Marco Polo and water volleyball. If the pool has a deck or diving board, have a cannonball contest with judges. Whoever can throw out the most water wins! Games to play outside of the water can be horseshoes, volleyball, bocce ball, lawn darts and croquet. Prizes can be awarded if wanted, but most people just enjoy doing it.

If your pool party is for a birthday, make it a square shape with blue frosting to look like a pool. Stick a diving board over it with a plastic person, or for laughs, add a shark. Make it a fun day!

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Bar Mitzvah Planning 101

Planning your sons Bar Mitzvah can become pretty overwhelming. After all, the transition to becoming an adult is an important stage in your childs development and you want everything to be just right. No doubt, this Bar Mitzvah will be the biggest birthday party youve ever planned. Where to get started? Here at Bar Mitzvah Planning 101 of course!

Consider Using a Pro

Theres no point in freaking out about a Bar Mitzvah! Consider bringing in a professional event planner to help you see things through, on time and with some class. A party planner can do all of the worrying for you! Just give them your to-do list and it gets done. An event planner can assist you with the enjoyable aspect of Bar Mitzvah planning, like finding the resources to bring to life your creative ideas. Whether it's having your sons name in lights or the finding perfect dance floor giveaway favors. The best part about hiring an event planner for Bar Mitzvah planning is that they will take care of all the boring stuff too (like hiring your vendors).

Get the Theme Right

You want you son to have the greatest party ever and, he wants to have the greatest party ever. Unfortunately, your idea of what is "great" isn't exactly the same as his. Yes, the Bar Mitzvah may be all about him, but unless his paying for it, he will have to learn the true meaning of the word compromise. This is another area where having an event planner can come in handy. It is good to have a neutral person who will listen to everybodys ideas and then provide guidance to help sort them out.

Conquer the Guest List

Youll want to invite all of your friends, hell want to invite all of his friends, and then theres the family to still invite too! First, figure out a wish list of everyone you could possibly want if you had all of the resources to do it. Then youll want to start trimming the Bar Mitzvah guest list down to a size that fits your budget and the amount of space in your venue. Running out of food, chairs, and space wouldnt be a good time for anybody! If you feel the need to add a few more guests to the list, don't stress out about it too much. Take a good look at the entire situation. If inviting nine or ten more people won't break the bank, then why not do what makes you happy.

Decide On Your Vendors

Booking your vendors can be another daunting task. After all, you want everything to be perfect. Its a good idea to start looking at least a year in advance for your decorator, DJ or band and photographer. Many vendors will have a gig every weekend during the busy Bar Mitzvah season, so if you can secure the date ahead of time it will save you the disappointment from finding out your preferred vendor isnt available on the date of your event. It's important to meet as many vendors as possible so you can compare styles and personalities. You can also ask the venue you've chosen for recommendations. Once you've got a list of candidates, check out their websites to preview their work. See something you like? Make a time when you and your son can meet with them in person. Remember the more comfortable you are with who you choose, the more relaxed you will be the day of the event.

Start Celebrating

Youve chosen all of the right vendors, the guests are arriving and the big event is here. If youve followed these bits of advice for Bar Mitzvah Planning 101 then you shouldnt have anything to worry about. Remember to relax and enjoy the night. Your son will have enough to be nervous about on his own when it becomes time for him to read from the Torah.

Mazel Tov!

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Mike Holmgren owes Bill Cowher and NFL Fans an Apology

Since when is it OK to totally snub the winner of an NFL game, let alone the biggest game of the year, the Super Bowl? Well that's exactly what Mike Holmgren, the head coach of the Seattle Seahawks, did on Super Bowl Sunday after his team lost the game. Not only did he not meet Coach Cowher, the longest tenured coach in the NFL, on the 25 yard line for a congratulatory handshake as scheduled, it was actually Cowher who had to go out of his way to find Holmgren. The moment finally took place in the Seahawks locker room, so I can speculate on who pursued who. At a time when he should be enjoying his much deserved win, Coach Cowher was chasing down a sore loser, because Cowher knows how it works. The deal isn't done until the handshake. It's tradition, a tradition rooted in good sportsman ship. A tradition that Holmgren dismissed because he was angry. What a great example, what a wonderful role model he was to all of the kids watching.

In 1995, Cowher and the Steelers lost the Super Bowl to the Dallas Cowboy's under similar circumstances. Bad officiating, lot's of "if'y" calls, touch downs that really weren't. But when the clock expired and the game was over, Bill Cowher marched right into the center of the field and shook the victor's hand and offered a few kind words. He didn't slither out of the back door, he also didn't return to his teams host city and bad mouth the officiating. He did give a losing coaches interview in the locker room and was seen embracing his tear-soaked family, obviously broken hearted by the loss. Coach Cowher has given his respect, he has given his props, he has played by the rules, and yet, even though he is the longest tenured coach in the NFL, everyone in the media, on sportscenter, even the NFL itself refuses to admit that Holmgren snubbed Cowher because he was angry. I wonder if this story would have been bigger had it been Bill Belichick that got shafted?

Don't get me wrong, I didn't have any axe to grind with Mike Holmgren, not until he pulled this nonsense. I've always thought he was a stand up guy, I even pulled for him and his Super Bowl Champion Green Bay Packers in 97'. You see Mike has been around the block a few times. He's not some 35 year old hot-head who's never seen the inside of the Super Bowl. The man has been there twice not including this last appearance, walking away with one trophy and one heartache. For him to be such a veteran coach with so much big game experience makes this insult and lack of respect from him even harder to swallow.

The NFL is talking about fining him for the remarks he made to the home town crowd in Seattle, in which he insinuated that the referee's were responsible for their loss to the World Champion Pittsburgh Steelers. I sincerely hope they levy the largest fine possible on his plump "wallet". Because the statement is not true. The Seattle Seahawks had just as much chance to win that game as did the Pittsburgh Steelers, but it was a battle of coaching and Holmgren was definitely out coached by Cowher. In the waning minutes of both halves of the game, Holmgren was managing the clock like it was a pre-season contest, not the Super Bowl. Constant mistakes which ground away the clock and his teams chance to win. His kicker missed field goals, field goals that super bowl champ's MUST make, just ask the New England Patriots. His best receiver dropped nearly every pass thrown his way. His MVP of the league running back never saw the inside of the end zone. Holmgren started the game passing, yet when crunch time rolled around and the clock was going away, he thought it was a good time to start running the ball for 3 and 4 yard gains. Yet Holmgren takes the low road and calls the ref's out and points his finger of blame in their faces.

On the other side of the field Coach Cowher was planning his work and working his plan, devising plays that totally caught the Seahawks off guard, including the Rothlisberger TD that was subjected to review, even though the ball obviously grazed the goal line, the Willie Parker run that caught Seattle in the all-out blitz that gave Parker clear sailing once he cleared the line, the end-a-round from Randle El to Ward for the kill shot. All Bill Cowher calls, all at the perfect time, and all very very effective against an absolutey bewildered Seahawks defense.

I hope this piece winds up, somehow, in front of Mike Holmgren because I have something to say to him: "Mike, Mr. Holmgren, Coach, you lost the game not because of bad officiating, you lost the game because you are not as good of a Coach as Bill Cowher. He took you to school, so try to learn a few things from him instead of throwing a tantrum and disrespecting one of the greatest coaches in league history. I can only hope that one day someone shows you total disrespect at a time when you should be congratulated for a job well done. You lost. Live with it."

My congratulations go out to the World Champion Pittsburgh Steelers, but more than that, I want to extend my respect and admiration for a true class act, Coach Bill Cowher, a native of Pittsburgh, which has gotta make this all the more sweeter. Although I don't play football, or any sport for that matter, you will always be my head coach.

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Meditation and Memory

Meditation is a wonderful method of helping the entire body to relax. Through a system of breathing exercises the body naturally feels the stress being released and for many people it allows them to be much more open and receptive.

Meditation can also aid in helping with memory. When a person feels relaxed the memory seems to function much better. Through the use of breathing and concentration the memory feels alive and vibrant once again.

Remember the last time you forgot someone's name or their birthday? It was probably during a period where you had a great deal on your mind or you were feeling stress.

Upon realizing your forgetfulness this generally stirs up even more anxiety which again leads to more memory problems. It's a cycle that some people find themselves constantly in.

By employing some of the techniques of meditation that people have been using for years, you can help open up your mind and memory thus allowing it to function better.

It's wonderful to imagine having the ability to recall names, numbers and important dates without having to look for pieces of paper or check a calendar. Instead it would all be there within your memory.

Meditation does not need to be a complicated process. There are simple exercises that anyone can do for a few moments each day that will help boost the memory.

The key to using meditation as a memory booster is that it will help build concentration which works hand in hand with developing memory.

Finding a quiet spot is very helpful when you want to meditate. Some people also feel that having essential oils or candles burning adds to the necessary ambiance.

If that does help you relax than it's going to beneficial to the entire process including helping you to reenergize your mind. There are also certain scents of oils and candles that are said to be beneficial for memory function.

Meditation can be taught in a class and there are usually classes offered at natural health care facilities and often even at regular gyms.

Some of the classes are geared towards helping the memory to function. For a person who feels as though their mind isn't as sharp as it once was, taking one of these classes will benefit them for years to come.

Building up a regular routine of meditation to aid in boosting the memory will also build self-esteem. Feeling as though you are on top of your game mentally is a wonderful self-image booster.

For someone who feels less comfortable within a class of people learning meditation, there are many books and manuals that offer substantial information on mediation as a method of empowering the memory.

Some offer illustrations of body position and along with descriptions for the breathing exercises. Following the methods outlined daily will open the person up to the benefits of meditation.

By using the techniques described they will not only be relaxing their bodies but fueling their memory as well. Having a relaxed and clear mind is one of the most important aspects to having a strong memory.

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