HDTV/3DHDTV: How to choose an LCD TV without mistakes!
ByTo choose the best LCD TV you need to follow some advice. Then: size of screen size is one of the key elements in choosing an LCD television. This is expressed in inches (1 inch = 2.54cm) and represents the length of the screen diagonally. The size can be from 13, 15, 17, 20, 22, 30, 32 and 40 inches (respectively 33, 38, 43, 50, 55, 76, 81 and 101 centimeters).
Contrary to a TV picture tube, on an LCD screen size has no effect on weight while the price increases greater becomes the screen. If you are planning to buy a TV with sizes between 25 and 28 inches, you should have a viewing distance of about 2 feet for a screen 32pollici distance is about 3 meters high, but for a screen 36 “this should correspond to 3.5 meters. For the installation of screen sizes between 50 and 60, the optimal viewing distance should be between 4 to 5 meters.
Tuner standard that element which allows you to record TV channels in the automatic version mentrelo standard concerns the type of video system. In Europe, the type of video standard is PAL and Italy, but most LCDs are compatible with the three PAL-SECAM-NTSC. The sound The sound of a standard LCD and STEREO.
Connections The connection of a standard LCD television and taking expert who is behind the TV in most models. If you’re forced to attack a number of models to the LCD, we recommend a scart socket. In addition, the expert made the LCD proposes a RGB input that allows you to connect a video camera and see the films. LCD, having been created by computer technology, allows you to connect to the PC (XGA, VGA ,…).
The headphone jack is available on most LCD.Use”standard” the presence of connection for the composite (RCA), one for s-video, and for at least 2 SCART (with at least one compatible RGB). For HDTV applications, however you must check for a link HD Component (Y Cb Cr for component interlaced, y pb pr for Progressive Component), DVI-HDCP or HDMI connections for HDTV set-top boxes and HD recorders / players (Blu-ray/HD-DVD).
Importance of HDMI HDMI stands for High Definition Multimedia Interface, and is essentially a link between source and display all-digital, capable of carrying both audio and video (digital) through a single cable. The portable video is that “community” is also conveyed by the connection to DVI, while the most significant differences we find around the transmission of the audio track, unlike the DVI – which stipulates only the video – with the HDMI connection will it can convey even more compressed multichannel audio formats used today (first of Dolby Digital and DTS) and uncompressed audio formats such as PCM.La presence HDMI input could be a particular not to be overlooked, because as of now is required by the new high definition decoder Sky, for example, benefit from the offer in high definition you must be a subscriber to SKY to SKY, call on the option and have an HD TV with HD Ready logo (with HDMI or DVI input with HDCP) . The format 4 / 3 ou 16/9mo? Most television programs are in format 4 / 3. Despite all the vision 16/9mi any channel, so if your LCD is to use a microwave, we recommend taking the 4 / 3. In any case, it is good to know that through 16/9i, you may see a black stripe at the top and bottom of the image (theater effect). On the contrary, this situation does not occur on an LCD TV 16/9i.
Indeed, as the name implies, the format fits the image. Therefore determine the presence of these features can be purchased tranquillamente.Risoluzione The resolution of a screen measures the number of pixels (tiny light elements that make up the LCD panel) that make up the image. The greater the number of pixels the better will be the definition and image quality. The unit of brightness is in candelas (LUMEX) per cm squared. It is calculated by taking the most luminous and least luminous (typically 4 / 6) and is made an average. Maximum contrast ratio between the brightest point and the least bright. The contrast is higher than the screen image is bright. Eg. 400:1 (good brightness) 500:1 (high luminosity). As for contrast and brightness, these are objective values that are expressed in numbers: the contrast, usually reaches values 300-500:1 and the brightness (expressed in candelas per square meter) from 200 to 500cd/m2. I’ve always preferred monitors who have values very close to the maximum until 5000 CONTRASTO.Angolo viewing angle of vision on an LCD TV is a topic often forgotten, but well known by those who have already bought some laptop in the past.
If the angle of view is too narrow, and the viewer is not on line matchmaker of the TV set in living room or bedroom will never see ‘the images flow with the same quality enjoyed by the viewer from the central position, but will perceive’ faded images with little contrast and colors that can appear distorted. This case was especially with the first generation of LCD TVs in some cases still on sale. The LCD models offer better viewing angles ranging between 150 and 170 degrees horizontally and at least 130 degrees verticalePixel ! make sure that all pixels are working, because ‘the presence of defective pixels, ie points on the screen in time to keep the same color, it can affect not just the best use of device.
Many manufacturers but also provide a guarantee that pixel zero namely the replacement of the monitor if you experience during the first six months of life, the presence of one or more dead pixels. Pixels are a feature which underpins the operation of the LCD: (briefly) English Abbreviation Liquid Crystal Display (LCD). LCD technology has been used in the early 70s for pocket calculators. Through further development, is now used in flat panel displays, in the rear projection TV and front projectors. It ‘a system which consists of thin glass plates alternating with a layer of liquid crystals. All points of this layer can be controlled individually with the help of electrical conductors. The precision of control significantly determines the quality of projected image. How does LCD technology? Thin Film Transistors (TFT technology, ie, thin film transistor) provide power to the cells green, blue and red filled with liquid crystals.
Through an electrical charge that strikes the crystals, they filter the light coming from a lamp placed on the back of the screen in a flat screen TV. If you wonder why buy here’s the answer: Why choose an LCD TV? Because it is very flat so comfortable, and has a very good aesthetic and innovative. Because in addition to being a real color TV (thanks to the internal tuner) and the ability to connect DVD players, satellite receivers and any other video signal. Can also be used as PC monitors. Because the liquid crystal panel is very durable, “the lamp” has an average life of 60,000 hours (about 20 years). Because the minimum depth and the lightness of the LCD TV allows you to choose any location, even hanging on the wall like paintings.
Why LCD TVs consume much less than a traditional CRT TV. Because the images are so stable and perfectly defined eyes that do not tire even after many hours watching TV. Why is harmless: not an electronic panel, does not emit electromagnetic waves.
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