Help buying a LCD TV (2)
ByKey Features
Format
Until such time as high-definition widescreen TVs became common, many programs continue to be broadcast in 4:3. Most LCD TVs are designed to operate in 16:9 (for the 4:3 is still common) and are able to adapt to the new 4:3 picture format, usually stretching the image or to zoom. The idea is always to preserve the pictures, but in some cases these may be slightly distorted. The same goes for the traditional CRT TV 16:9.
Screensize
LCD TVs smaller until recently were the norm, it also means adding pixels to add transistors (three per pixel) and color in this way might appear slightly less sharp in the model size. For this reason, the most popular LCD sizes until they reached 19. “However, thanks to technological innovations today’s models 32″ and 42 “are increasingly common.
Depth
The feature that LCDs beat the traditional CRT is the depth. Many LCDs are only a few cm thick and can be hung on the walls or ceiling, making it essential for all those who have small rooms available, or otherwise wish to have more space without the latter is filled by the traditional CRT.
Matrix
Passive
LCDs are often less expensive products with the passive matrix system. It works through a grid of wires in which the pixels are placed at each intersection of the grid itself, which is then applied a current through two conductors, so as to control the light for each pixel. This system allows you to save but can cause a slow response in the exchange of images, which may be blurry or with little contrast, and the appearance of shadows.
Active
Active-matrix models, also known as “thin film transistor (TFT), focusing on particular pixel electricity using a transistor at each intersection of pixels. In this way the electricity can be applied more or less frequently, and improves the quality of the vision, greatly reducing the problems of sharpness and contrast passive matrix models.
Frequency
There are many more choices than 50Hz or 100Hz CRT models. A higher frequency reduces the likelihood that the pixels create the shadow effect.
Multifunction Display
LCD TVs are well suited to be used as a computer monitor. Text and images appear exceptionally bright and sharp thanks to their high resolution. LCD TVs generally have taken composite, S-video, component video and one or more SCART.
Light source
The source of light that passes through the liquid crystal is one of the most important characteristics for every LCD and if this is damaged your TV will be thrown out. Always check that the lamps can be replaced or however you choose brands with reliable or durable products. In some models the life of the TV is expressed in hours of lamp life.
Installation
Installation of LCD wall or ceiling is becoming increasingly common, thanks to the reduced thickness of these models. In any case, to avoid causing damage, it is better to turn to professional installers, who can connect the LCD to a home cinema system with surround sound as a complement.
The ‘dead pixel’
One of the disadvantages of LCD TV is that increasing the size increases, so does the number of pixels and transistors needed. Was problematic for manufacturers to ensure that all these elements reach the same high quality standards. Occasionally some pixels stop working (so-called “dead pixels”) and can interfere with vision.
Integrated Tuners
Despite the small thickness, the majority of LCDs is produced with built-in tuner, so you do not have to fill the room with additional decoder.
Power consumption
It ‘a factor to be considered, particularly with the larger models, which consume most of the smaller models. In any case, the LCD consumes considerably less than Plasma TVs up to 30% less in some cases.
Resolution
You may think that the higher the resolution, the better the image quality, but not necessarily so. The VGA resolution is the most common, but you can also find models with XGA resolution (1024×768 pixels) or, in models widescreen W-XGA (1280×768 pixels). Do not be fooled by acronyms or numbers, control the quality of the image. Good indicators of the latter are tied to realism in the skin tones and contrast, especially in dark scenes.
Viewing distance
The viewing distance is closely dependent on the size of the TV. Here you can find some general guidelines.
Dimensions (in inches) for optimal viewing distance (in meters)
20 “- 27″ 0.7 to 1.5
32 “- 37″ 1.8 to 2.4
42 “- 46″ 3 to 4.2
50 “and over 3.6 to 4.8
Accessories
Wall Brackets
E ‘the ideal accessory to take advantage of the reduced depth of an LCD, since it adds to this only a few cm and allows the installation to wall or ceiling.
Tabletop
It ‘better to know that the pedestal table is specific to each model of LCD TV. If the stand is not included in the set you buy, check carefully that is compatible with your model of TV.
Related Products
Plasma TVs
The Plasma TV may be better for the screen size, the vision of fast-moving images and the contrast of black. The fact is that developments in this area are very fast and those who until recently were the problems that often afflict this type of TV, as the appearance of spots, the high power consumption and reduced reliability, are slowly disappearing. Will be easier for you to choose between LCD or plasma focus your attention on the type of use you intend to do with it.
CRT TV
Technology in use for some time but with plenty of room for improvement still, it offers good image quality and cost considerably less than that of an LCD TV or plasma, it is nevertheless still quite bulky equipment, which in a small house could easily be seen as ‘too bulky’ and then allow the passage of the latest LCD or plasma
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