Archive for the ‘LCD Flat Screens’ Category
A flat lcd tv is a great purchase because of the low profile and spacial efficiency, but not that alone. A flat lcd tv is also great because it offers the highest resolution of any tvs, and also because it has low glare, almost no glare at all. This is because the flat profile of a flat lcd tv means that, unlike a normal curved tv screen, which catches light from any direction and sends it to you in the form of glare, a flat lcd tv is only vulnerable to light ddisturbances from a particular direction, kind of like a mirror, and unless there is a powerful light source there right in that specific spot, the flat lcd tv will not reflect it back at you.
The reason it can have a flat screen is because a flat lcd tv does not have a cathode ray tube like a normal tv. A cathode ray tube, or crt, is basically a gun that shoots out electrons at high speed at the surface of a normal tv. These electrons strike a surface that flouresces, or glows, giving you a pixel on the screen. This means that a crt tv has to have a curved screen and enough depth to position an electron gun behind it to shoot the image out of the tv. A flat lcd tv, however, because it doesn’t have a crt tube, but instead a light source with polarizing filters and a thin layer of liquid crystals between, it can be very thin and efficient.
It also uses up less power by far than a normal tv so, although initially, a flat lcd tv will cost more than a normal tv, eventually, that flat lcd tv will actually save you money by cutting down on your electricity bill. But the best thing about a flat lcd tv is the clarity of the image. Because there is no distortion from the curved screen that normal tvs have, you will simply never see a clearer image than on a flat lcd tv. Additionally, flat lcd tvs have better resolution than most normal tvs and clearer defined boundaries. This will make some difference in watching normal tv programs, but is most noticeable when you look at dvd movies, which are at a higher resolution than normal tv programs. If you are a movie fan like I am, flat lcd televison is the way to go without a doubt!
Muna wa Wanjiru has been researching and reporting on TV for years. To Post Your Comments on Flat LCD TV, visit his Blog at Flat LCD TV
With all of the various TV display technologies on the market today (Plasma, DLP, LCD, etc.), it is important to understand the basic pro’s and con’s of the display technologies used in manufacturing High Definition TVs. First, here are the dominant types of displays available today:
- Direct view tube CRT
- Flat panel LCD
- Plasma
- Rear projection LCD
- Rear projection DLP
- Rear projection CRT
- Rear projection LCoS
What makes a plasma TV better than a direct tube CRT? Why would I choose a rear-projection TV over an LCD? Each type of display has inherent advantages and disadvantages associated with the technology used in manufacturing the display. The following guide provides a synopsis which should help you understand relevant points to consider when deciding which HDTV display type is right for you.
Direct-view CRT HDTV Displays
CRT stands for “cathode ray tube” and is the type of TV we are all most familiar with. Chances are, if you have a TV that is 5 or more years old, you have a CRT TV. Despite their age, CRT displays still offer a lot of bang for your buck.
The main advantages of CRT’s include:
- Flat screen – which provides wide viewing angles (most new CRT’s built today have flat screens, but you will still find a few that have are manufactured with curved screens)
- Outstanding picture quality
- Relatively inexpensive in all sizes
- No danger of burn-in
- Capable of producing true blacks
Sounds great, so why are CRT displays losing market share new display technology like plasmas and LCD’s?
- Bulky size and very heavy weight
- Maximum screen size is limited to approximately 36″
To give you an idea of what is meant by “bulky” and “very heavy”, a typical 27″ flat screen CRT will weigh around 100-120 lbs, a typical 30″ flat screen CRT will weigh about 150 lbs and a typical 36″ flat screen CRT will tip the scales at about 200-225 lbs. At over 200 lbs., that kind of weight is going to require at least 2 strong people to lift it up onto the TV stand.
CRT’s are also much larger in terms of depth. A typical 27″ CRT measures 20″ deep, a typical 34″ CRT measures 24″ deep, and a typical 36″ CRT measures 26″ deep.
Why should I choose a flat screen CRT over a curved screen CRT?
The answer is two-fold: 1) Having a flat-screen will allow for wider viewing angles, so that you can those people sitting on the left and right sides of the TV also have a good view of the images being displayed. 2) Having a flat screen will allow you to view the picture as it was meant to be seen, without any of the stretching in images that is associated with a curved tube. A curved tube has inherent flaws that cause the image to be “stretched” as it reaches the edges of the screen. While this may not be an important feature for you, I would encourage you to look at a flat screen and a curved screen side-by-side. The difference in image quality will be much more apparent.
Flat panel LCD HDTV Displays
LCD stands for Liquid Crystal Display and is the type of TV you will be familiar with if you have seen the flat-panel LCD monitors used with many newer computers. The same technology is also used in LCD TV’s.
The main advantages of LCD’s include:
- Flat screen – but see below for note on the viewing angles
- Thin, lightweight and stylish looking
- High resolution and excellent picture quality
- No danger of burn-in
Flat panel LCD’s main disadvantages:
- Relatively narrow viewing angles
- Expensive in sizes over 30″
- Incapable of producing true blacks
To give you an idea of what “thin” and “lightweight” means, a typical 27″ to 30″ LCD will weigh about 40-50 lbs, a 32″ LCD will weigh about 50-55 lbs, a 37″ LCD will weigh about 60-65 lbs. These types of TV’s are thin and light enough to be hung on a wall.
Plasma HDTV Displays
While plasma displays used to be much too expensive for the average Sunday football fan, they have come down in price enough to become a very attractive choice for many HDTV shoppers. Having said that, you will more than likely still pay more for a big-screen plasma TV than a similarly sized rear-projection display. What makes plasma TV’s so attractive?
- Flat screen with very wide viewing angles
- Very thin and lightweight
- High resolution with deep, saturated colors
- Excellent picture quality (especially for home theater)
Plasma’s main disadvantages:
- Fairly expensive compared to other HDTV display types
- Slight potential for burn-in
- Limited lifespan
To clarify “thin” and “lightweight”, a typical 42″ plasma will weigh between 50-90 lbs, a 50″ plasma will weigh about 80-110 lbs. These types of TV’s are thin and light enough to be hung on a wall.
Rear projection HDTV Display
Rear projection TV’s are an economical choice for a large sized TV and they still offer excellent picture quality. They are, however, too large to be hung on a wall and work best when placed on a TV stand (or on the floor in the case of rear projection CRT’s). The most economical type of rear projection display is the rear projection CRT.
Rear projection CRT HDTV’s offer:
- Flat screen
- Relatively low cost
- Excellent picture quality (especially for home theater)
Rear projection CRT’s main disadvantages:
- Very heavy and very bulky
- Narrow viewing angles
- Image visibility suffers in brightly lit rooms
Very heavy and bulky is a nice way of saying that rear projection CRT’s are HUGE. A typical 48″ rear projection CRT weighs 150 lbs. and is a little less than 24″ deep, a typical 56″ rear projection CRT weighs almost 200 lbs. and is over 2 feet deep, a typical 65″ rear projection CRT weighs 300 lbs. and is over 2 feet deep, and a typical 73″ rear projection CRT weighs over 400 lbs. – now THAT is a huge TV!
Rear projection LCD, DLP and LCoS HDTV Display
These types of rear projection HDTV displays are also referred to as microdisplays. They work by using a lamp that bounces light off of or through a tiny pixel-filled microchip and onto the screen.
Rear projection LCD’s offer these advantages:
- Flat screen with good viewing angles
- Thin and lightweight compared to CRT
- Not susceptible to image burn-in
- No “rainbow effect” artifacts that are sometimes found in rear-projection DLP TV’s
- Excellent picture quality (especially for home theater)
Rear projection LCD’s main disadvantages:
- Fairly expensive
- Slight delay when powering up
- Lamp replacement required periodically
- Possibility for “screen door effect” artifacts
Rear projection DLP’s offer these advantages:
- Flat screen with good viewing angles
- Thin and lightweight compared to rear projection CRT
- Not susceptible to image burn-in
- No “screen door effect” artifacts that are sometimes found in rear-projection LCD TV’s
- Excellent picture quality (especially for home theater)
Rear projection DLP’s main disadvantages:
- Fairly expensive
- Slight delay when powering up
- Lamp replacement required periodically
- Possibility for “rainbow effect” artifacts
LCoS, D-ILA and SXRD These technologies are all variations on the same manufacturing process that utilizes liquid crystal on silicon (hence the acronym LCoS). However, implementation of this display technology differs significantly from one manufacturer to the next, so it is impossible to lay out common pro’s and con’s of the technology itself. Each TV with this type of technology will have different characteristics for image quality, viewing angle and cost. I recommend researching each manufacturer and their specific models featuring LCoS in order to compare their benefits and drawbacks to other display types.
Conclusion
There are lots and lots of choices online and in stores today for new TV’s. Enter into the television section of any Best Buy or Circuit City and you’ll get bombarded with a myriad of options for plasma, LCD, direct-view tube and rear-projection TV’s. What you choose for your new TV will either brings you hundreds of hours of enjoyment watching movies, sports and news or will bring you many hours of frustration by not choosing the best type of TV for your needs. My hope is that this information will give you the knowledge, and the confidence, to make the right decision for your next TV purchase.
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ou probably are already aware that there are two types of computer monitors available today: the big and clunky cathode-ray (CRT) tube monitors and the newer flat screen monitors. These flat panel monitors have a number of advantages over the older type of computer monitors. They are far sleeker, more space-saving and weigh much less. Flat screen monitors are also designed to be more energy-efficient and reduces eye strain. Flat screen monitors use the technology called Liquid Crystal Display or LCD. There are also flat screen CRT monitors available. Both LCD flat panel monitors and CRT flat-screen monitors are fast gaining popularity as a much sleeker and more modern alternative to traditional, bulky monitors of yesterday.
An LCD or liquid crystal display is characterized by a thin and flat display device that is composed of either color or monochrome pixels that are arranged in front of a light source or a reflector. There are two types of LCDs: transmissive and reflective displays. These types differ according to the source of light. A reflective LCD is illuminated by exterior light. A common example of a reflective LCD is the display of a digital watch. Meanwhile, a transmissive display draws its light source from the back through a backlight. This category of LCDs usually requires high luminance levels. Televisions, computer displays, PDAs and mobile phones use transmissive LCDs.
Flat screen monitors have significant advantages over the traditional CRT monitors. Because these monitors are perfectly flat visually and physically, they offer a clearer, more vivid and undistorted pictures from any angle. The images on a flat panel monitor is much more crisp and high quality. This is the reason why flat screen monitors significantly reduce eye strain among its users, another important advantage. There is no curvature on the screen’s surface that will distort any on-screen images. And since the pictures are sharper with more brilliant colors, staring at a flat screen monitor becomes more of a pleasure than a strain.
Flat screen monitors are also much more ergonomic. This means that these types of monitors follow ergonomic requirements and thus add comfort and convenience for the worker. The flat screen monitor is viewable from any angle and is typically fitted on a swivel base with adjustable headlight. This allows for more freedom of movement for the user since the flat screen monitor can be easily adjusted to meet the specific viewing needs. Flat screen monitors are also very space-efficient taking up less desk real estate than older computer monitors. Most LCD flat screen monitors are only about an inch thick and weighs nearly five kilograms.
If you are planning to buy a new flat screen monitor, there are some aspects you should consider. First, choose the resolution that is most appropriate to your needs. Next, assess the price. Generally, flat screen monitors will cost you about $200-$250 for a CRT screen while LCD flat panel monitors cost $500 to $700. Both LCD and CRT flat screen monitors have an average lifespan of about 5 to 7 years, and also come with warranty ranging from 1 to 3 years. Before you purchase, make sure that you do your research on the many different brands of flat screen monitors available in the market today. A flat screen monitor will definitely enhance your computing experience, whether for work or for play.
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LG.Philips LCD Wednesday took the wraps off a 100-inch thin film transistor liquid crystal display (TFT-LCD) panel, which the company claims is the largest in the world. The model developed by the world’s runner-up LCD producer is about 1.5 times bigger than the previously largest 82-inch product of Samsung Electronics, the global top player.
“Our development of the 100-inch LCD panel reaffirms LG.Philips LCD is the global leader in large-area LCD technology,” the firm’s vice president Yeo Sang-deog said. “Technological advances for large-area LCD TVs, such as the 100-inch LCD, will act as a catalyst that accelerates demands for high-quality and large screens,” he added.
Developed at the company’s seventh-generation production lines at Paju, Kyonggi Province, the high-feature panel is a wide screen (16:9) with its width and height amounting to 2.2 meters and 1.2 meters, respectively.
The high-definition model, which offers 6.22 million pixels and can produce 1.07 billion colors, boasts a response speed faster than 5 milliseconds.
This means the amount of time it takes for the LCD TV’s liquid crystal cell to go from black to white is 5 milliseconds, lower than previous norm of double-digit milliseconds. Lower numbers represent faster transitions and therefore less visible image artifacts. Monitors will not create a smear or blur pattern around moving objects.
The LCD panel of LG.Philips LCD, the joint venture between LG Electronics and Royal Philips Electronics of the Netherlands, also has a maximum 3,000:1 contrast ratio and almost an 180-degree viewing angle.
The contrast ratio means that the brightest color on the screen is 3,000 times brighter than the darkest color that the panel is capable of displaying simultaneously. The higher the ratio is, the better the display is.
In addition, the wide viewing angle shows that the images on the monitor will be vivid to watchers at any angle. More info on Philips LCD Televisions can be found at their LCD Television product group website.
The 100-inch model is expected to maintain the summit place for the time being because Samsung Electronics, the cross-town rival of LG.Philips LCD, has no scheme to challenge the product.
Samsung, which developed the previously biggest 82-inch LCD panel last year, has been touted as arguably the only candidate posing a threat to LG.Philips for biggest LCD. “We are not researching any LCD panel larger than 82 inches diagonally and have no plan to develop at the moment,” Samsung spokesman Shin Young-jun said. The remark sharply contrasts to that of Samsung’s executive vice president, Kim Sang-soo, who expressed confidence in producing mega-sized LCD at an unveiling event of the 82-inch item in March 2005.
“Making a 97-inch model is just a matter of time. There is virtually no technical limitation for producing LCD larger than 82 inches,” Kim said at the time.
LCD is the first offspring of the flat-screen family, which eroded the long-time dominance of the bulky cube-based monitor that causes eye strain and consumes a lot of power.
As the technology opened the door to flat-panel displays with outstanding advantages, anothor high-end screen PDP was also brought into the game.
Unlike the fat cube-based TVs, both LCD and PDP are of sleek appearance as they show images via liquid crystal or plasma, which are sandwiched between two thin glass plates.
Technologically, PDP is suitable for large-sized screens since it is difficult to trap plasma between two small plates. By contrast, LCD does not go well with large monitors due to the properties of liquid crystal.
As a result, experts have expected LCD would be the mainstream product for the small screen while PDP would be predominant in the market for screens larger than 40-inches.
However, the uphill battle between Korea’s dynamic duo -LG.Philips and Samsung- has worked in the favor of LCD by trimming its price and adding seamless technological advances.
The 100-inch LCD is merely three inches shy of the biggest 103-inch PDP monitor, unveiled by Japan’s Panasonic earlier this year.
LCD prices halved last year to the level of LCD thanks to technological progresses and rivalry in the 40-plus inch LCD panels market, the major battlefield between the two flat-panel products. If you would like to know more other about Philips Flat Panel televisions, you can visit the Philips Flat Panel TV website.
Market observers predict LCD will maintain its competitiveness in even 50-inch display markets, which they initially thought would be flatly dominated by PDP.
The author of this article is an entertainment and technology nerd. Things like 100″ LCD TVs make him go mad. Therefore, one of his favourite website is Philips’ television website.
Laptop LCD repairs usually entail a replacement of the LCD. One option is to look for a broken laptop to serve as a donor for the LCD. Or you can buy a new one from your laptop’s manufacturer.
If you are bold enough, you can take the whole matter of laptop LCD repairs into your own hands. You can ask the manufacturer of the LCD to give you a manual that has instructions on LCD replacements. With this helpful tool, you should be ready to do your own laptop LCD repairs. Read on for some helpful instructions.
The first step replacing an LCD is to remove the power cable and the battery. Next in line are the rubber grommets around the bezel. Make sure that you are using the right size of bit when working on the removals.
After you’re done removing the grommets, work on the bezel itself. Be extra cautious though. These bezels easily break as they are made of thin plastics. Also, bezels have a property that allows for an easy snap. This basically means a difficult job on unsnapping.
After a successful bezel removal, turn your attention to the metal frame at the laptop’s top lid. You will have to remove 14 screws before you can release the metal frame. After this step, you now work on the LCD. You have to lower the LCD panel into a resting position after which you remove 4 screws. This should release the LCD from the frame. Finally, unplug the wire connections ands remove the LCD panel.
It’s time to install your new LCD panel. Again, be very careful especially when handling your LCD panel. You didn’t buy a new one only to damage it. For a better protection, make it a point to lay down the panel on a soft surface. You can use a towel as buffer. Attaching the replacement LCD is actually doing the whole process of laptop LCD repairs I just mentioned above.
If I may reiterate, in laptop LCD repairs first thing to do is to reattach the four screws you removed from the old LCD panel after which you reattach the metal frame. You then lift the lid over the frame, just where you unattached it. You then reattach the 14 screws. Finally, you snap the delicate bezel back. This should be easier than the painstaking unsnapping process. Don’t forget to replace the rubber grommets and of course the bezel screws.
Now test try your laptop and celebrate all the benefits of doing laptop LCD repairs yourself. You get to save a lot of money and frustrations from dealing with sometimes impertinent technicians. And of course there is the prized benefit in the form of a sense of accomplishment.
Be careful not to turn the whole thing into a false economy. Be very careful in handling the delicate parts and be very meticulous with the instructions. You don’t want to turn a simple problem of LCD defect into a laptop overhaul. Remember that you intend to save money, not waste some.
Francisco Segura owns and operates http://www.howtoreplacelaptop.com How To Replace Laptop