Television Projection Reviews / lcd projection tv

Projection screens are special screens used to project an image for the audience. Movie theatres use projection screens on a wide scale. These screens are used in conferences or home theatres as well. The screens serve different purposes in different places. Therefore they are installed in various ways.

The projection screens can be wall-mounted type, pull down type or mobile type. Wall mounted types are needed for exact reproduction of the picture. Movie halls and home theatres use this type of screen. The second type, that is pull down screens do not need a fixed place, they can be used as and when required. Mobile screens are pull down screens mounted on a free stand but the projection of pictures are not perfect in these projection screens.

Projection screens are always matte white or matte grey. This helps in the perfect colour projection of the slides, otherwise, the pictures or images might get discoloured. Matte grey screens or grey screens reflect less light from the projector, they also absorb less light from the room. Image brightness ratio is correctly maintained and many call these projection screens high contrast screens.

The screens may be flat or curved, but flat screens are the preferred ones. Projection screens are used for both back and front projection. The light that is projected on the screen is diffusely reflected by the front projection screens. Back projection screens work differently. The light that is projected on them is diffusely transmitted through the screens.

Like any other consumer items projection screens can be of high quality and bad quality. It depends on how much the prospective buyer is going to pay for a screen. Obviously high quality screens will have higher price tags. It is advisable to go through the details of the product before purchasing. Many manufacturers give a detailed list of what they are offering.

Projection screens are mainly required for commercial purposes like in cinema halls or conference rooms, but individuals might buy them for their home theatre.

The buyer has to decide on the screen size. Minimum and maximum viewing distance has to be taken in to account. Minimum viewing distance is the distance closest to the screen from where the viewer can see the whole picture. Maximum viewing distance is the distance furthest from the screen, from which the picture as a whole can be seen.

There is a formula for calculating this, but those not strong in mathematics can depend on reliable makers who manufacture screens taking everything in to consideration.

Autor: charisma

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If you are thinking about the purchase of an LCD projector there are some important factors that need to be considered. You will need to determine how, where and when you will use it. Will you use it in your home or for a business application? With the growth of Home Theater Systems many consumers are choosing to opt for an LCD projector. LCD projectors are becoming smaller and more portable every day and can be the integral part of any business meeting. LCD projectors and laptop computers, DVDs, Camcorders, and other video sources work well together in many formats.

The cost is one of the most important factors with today’s economy. The LCD projector is not a stand alone device. You will need to buy a dedicated screen for the image display. You will need to get the correct video or computer cables that will be necessary. The projector’s lamp and its brightness is a critical factor in the determination of the correct projector for you. If you will be traveling for business you may want to have back up cables and projector lamps available, just in case. LCD projectors may be getting smaller and more portable but they are still fragile. If you will be traveling for business you should invest in a good LCD projection case.
Many cases are light weight and come with wheels attached for easy mobility.

With all these considerations in mind let’s look inside the projector to see what makes it work and the difference in performance. Some of the technical terms to know a little about when shopping for LCD projectors are: resolution, aspect ratio, brightness, flexibility and contrast. All of these relate to the image quality. If you bring the projector home and find out that it does not meet the standards that you thought it would it may end up being a costly mistake.

The resolution of the projector is important. If you will be using it with your laptop it is best to match the resolution so that the signals will be compatible. A projector’s resolution is the amount of pixels it has to create an image. The pixel is the smallest point in an image. The higher the resolution the more pixels and the sharper more defined the image will appear. The resolution is displayed with two numbers such as – (854×480 low resolution) or (1920×1080 high resolution). The first number represents the number of pixels that are in the horizontal row of the image. The second number represents the number of pixels in a row going vertically. The higher the resolution the more the projector will cost.

The higher the resolution the more superior the image quality will be. If your intentions are to relax at home and watch DVDs you really don’t need a projector with an extremely high resolution. If you will be using it with a laptop for a presentation with a lot of text and graphics a higher resolution projector is recommended.

The brightness of the projected image is determined by the projectors output and lamp specifications and the reflective surface of the screen that the image appears on. Brightness is measured in lumens. The higher the lumens a projector can produce the brighter the image will appear. The light level in the room figures in
the brightness scenario. A room with low ambient light and a bright projector will help decrease the amount of contrast in the image. Room size and the distance from projector to screen will also come into play with the brightness of the projected image.

The contrast of an image is the amount or ratio of bright white to a deep black hue that makes up the image. A high contrast projector is best used for video or DVD formats. They deliver a rich, highly color saturated image with good shadow definition. A higher contrast will give the image depth and dimension. A projector with high contrast is best suited for Home Theater Systems where videos and DVDs can come to life. Using a high contrast projector is a waste if you will be using it for business showing simple text or graphs.

The aspect ratio describes the horizontal vs. vertical rectangular shape of the image on the screen. There are two standard aspect ratio formats. They are 4:3 used for standard TV and 16:9 used for HDTV. This calculated 4 units of width for every 3 units of height. However, you will find that many DVDs and videos come with many different aspect ratio formats and will not always fill in the whole rectangular image. There is no one solution or fix to this problem. First you must decide on what formats you will view the most and go with the knowledge that the downside of the image is marginal.

Other not so technical features that you may want to incorporate into you LCD projector. A zoom lens will be useful when setting up the projector for multiple functions in a variety of room sizes and settings. The lens shift is also useful. For the optimal image the projector should be at a height that is as close to the center of the screen that you are projecting onto. The lens shift will move the projector lens left, right, up and down without having to move the projector. If centering the projector to the screen is not an option. If your projector has it you should use keystone correction.

The projector using keystone correction internally corrects the difference of the angle between the height of the screen and the height of the projector. Moving the projector in some meeting rooms is impossible or must be dealt with prior to the presentation.

There also may come a time when you might want to hook up a second computer or DVD if so you must check out the availability of multiple external ports. Check to see if the projector has a built in speaker or look for ports that will give you the capacity to plug into an external system if need be.

One more factor is weight. LCD projector comes in all shapes and sizes. If your business takes you on the road you will need a projector that is portable and easy to set up and breakdown. There are now projectors that weigh less than 5 pounds. The lamp and the lamp housing are the main hold ups in shrinking the projector much further.

The lamp and its lamp life should be considered before the purchase of any projector. An LCD projector lamp is the most important portion of the projector that you will have to replace at one point or another in the lifespan of the projector. You can find lamps that have a long lifespan of 2000hrs. If you use your projection daily that time will disappear quickly.

Some projectors come with multiple lamp modes. In the standby mode the projector may still be turned on while the lamp is off. This mode is useful if your meeting is in one room and your lunch is in another room. The lifespan of the lamp can be extended using this mode. All you have to do when returning from a break is to switch the lamp into active mode. There are also projectors that have a secondary mode. In the secondary mode the lamp is not projected at % power. This mode can be used in a smaller room or setting where distance and brightness is not the top concern. The third mode should always be used when you are finished using the projector. This is the fan mode. You may laugh but this is an important mode. If you turn the projector off without giving the fan time to cool off the lamp may cool too quickly, resulting with a cracked lamp. Turning the projector on and off to quickly is not good for the lamp or the projector itself. Both of these action are not recommended if you want to have your new projector around for awhile.

If you take some time to do some research before you invest in an LCD projector you will end up with a better product to use and enjoy. I hope that the above material helps you get started on the road to your new projector.

By: peterc35

By: peterc35

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Televisions previous to the Plasma TV explosion used the (CRT) cathode ray tube to give users the ability to watch television. CRT televisions works by shooting out a beam of negative charged particles called electrons into a large glass tube. These negative electrons

For the past 75 years, the vast majority of televisions have been built around the same technology, the cathode ray tube (CRT). In a CRT television, a gun fires a beam of electrons (negatively-charged particles) inside a large glass tube. The electrons illuminate phosphor atoms inside the tube (screen), this allows the TV picture to be produced by illuminating different areas of the phosphor coating, this is what gives you the CRT television.

Now welcome to the new face of television, Plasma TV. Plasma has taken the home theater market by storm because of their amazing picture quality and very thin design. The idea of plasma display panels began in 1964 at the University of Illinois. The first displays were very primitive using only points of light created in the laboratory. As time went on digital processing, and other technology, made vivid plasma displays a reality.

Plasma televisions use a much different type of technology thatn CRT models, they use something called pixels. Using a video signal the pixels on the flat screen light up with a high-energy beam of electrons that are separated into the 3 primary colors, red, green and blue. From the illuminated fluorescent lights pixels you get the full color spectrum that produces a full range of colors that give you the image on the screen. Each pixel on the screen has three fluorescent lights in it, a green, red and a blue fluorescent light. Each fluorescent light in the pixel can produce 16 million colors, giving you amazing colors and overall picture quality that you can’t finder in regular CRT televisions.

Another feature that you can’t find in CRT TVs is the widescreen design found on Plasma televisions. The (16:9) aspect ratio is the same dimensions used in movie theaters. This feature gives Plasma flat screen high definition television models a cinematic feel, that is great for watching feature films, concerts, Monday Night Football or anything else you can imagine.

And unlike conventional television models, there are no scan lines on plasma televisions, so the picture is much sharper. The viewing angle is far superior than CRT, there is 170 degree viewing angle so you can basically watch the TV from any area in the room. As I mentioned before Plasma Tvs are very thin, only 3.3 inches in width. This makes them perfect for hanging on your wall, freeing up space in your home. Just like a picture frame, you can now hang your television on your wall!

So who manufacturers these thin TV displays? You can choose from numerous brand names which I’m sure you are familiar with such as, Sony, Sharp, Hitachi and Samsung to name a few. Plasma isn’t the only technology available if you are a HDTV buff, you should also check out LCD televisions and rear projection TVs.

And if you want to find a cheap plasma TV, check out the discount deals available through internet, particularly Amazon.com and Ebay.com. Those 2 online merchants are trusted and can offer not only new, but used and refurbished models for even bigger savings.

Author: Richard Gazzo

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You found the perfect television. It’s a great high-def TV, with every bell and whistle you were looking for, and it’s exactly the right size to fit into the open spot in your living room. You can even afford it, with cash left over for the surround sound system you need as well. Only one problem: your wife hates it. Too big, too intrusive, and too attractive to all your college friends.

Don’t despair: there are plenty of solutions for installing the perfect high-def TV in your home, and some of them will eliminate any appearance of a television in your home - or make your television so attractive that your wife will insist on having one.

The Invisible TV: DLP TVs

A DLP TV is a projection-style set, which are much nicer today than they were twenty years ago when they were the mainstay of any bar setting. The best news is that not all projection televisions are locked into a case; today, you can get sets that look basically like an old slide projector. The scalable image they project will look good on a blank white wall, or on a portable or wall-mounted screen (mountings can be hidden beneath things like decorative shelves if necessary). This is a great solution for a small space, where one room performs several different functions.

The Camouflaged TV

You don’t have to go invisible, though. There are plenty of furnishing options for all but the largest television sets: armoirs, closets, and shelf sets can make your TV part of the living room, yet discreet. With the right shelf setup and a screensaver, you can even transform your plasma television into a fireplace; the flickering flame gives your room a romantic and homey atmosphere, and only close inspection reveals the truth!

Wall mounted televisions don’t work well with this solution, but there is a unique solution: a mirror cover. A transparent guard covers the screen, transforming the appearance of your high-def TV into a nice wall-mounted mirror. Turning on the set, however, allows the picture to show right through the cover. Certain sets allow for other solutions, though: screen saver-type technology can transform your set into a fishtank, or show the gradual setting of the sun over a tropical island.

The Ultimate Solution: A TV Room

One of the most popular new home improvement choices is a media room dedicated strictly to the television. This allows you to mount your surround-sound system in a perfectly-engineered room, with seating and other amenities that will have your friends over for the Superbowl, her friends over to see the latest chick flick, and for both of you alone to watch the movie of your choice, ending the evening with that romantic flickering fireplace.

Any high-def TV can transform the décor of your room, whether it’s your formal living room or the den, a dedicated TV room or your loft apartment space. Just a little creativity and shopping around for what’s out there will net you great rewards.

Author: SnS Designs Inc

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What is rear projection television? The term comes from the fact that the rear projection TV sends the image onto the viewing screen from behind the screen. When you are in a movie theater, the image in projected onto the front of the screen. That is why the projector is behind the audience in a movie theater.

If you are really into television, that the bigger the screen the better, right? If you feel that way about your television viewing, then no doubt you are considering moving up to the big, big televisions that are now available in the market.

While most of the recent interest is on flat screens and LCD screens, improvements in rear projection TV makes this a wise purchase to consider. Advances in the quality of the picture using rear projection TV make this a reasonable and less expensive alternative to the big flat screen televisions.

Advances in the technology of rear projection TV provide a variety of models that have never been available before. Your normal television set probably uses a CRT or cathode ray tube to project the image. Many rear projection TV use the same technology.

These units are quite large though when you increase the screen size very much. There are offsetting picture quality benefits. You may get better blacks and colors, but if the image is not properly aligned, this type and rear projection TV can produce improper color blending.

Another type of rear projection TV is based on a Liquid Crystal Display. However, this is not the same as the LCD used in a flat panel screen. This type of rear projection TV offers many advantages including that the size of the unit is quite small in comparison to the CRT models.

There is high contrast and brightness in the LCD based rear projection TV picture. Some disadvantages also exist. I will not go into the ‘technical’ but sometimes the image looks a little fuzzy, described as trying to watch TV while looking through a screen door.

Perhaps the newest rear projection TV technology is called Digital Light Processing. As the name implies, your television image is digitized and computerized and whatever else high technology does, but you get a great picture quality without some of the disadvantages of the other types. Problems with this type of rear projection TV is that include what is called the ‘rainbow’ effect if you move you eyes quickly from the TV to the surrounding room.

Find a reputable dealer, explain your viewing needs, and look at the different types of rear projection TV yourself. There is no reason not to have the best and biggest viewing experience with all this new technology in the rear projection TV.

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Author: Scott Michaels

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