LCD TV problem?
I just bought a 42inch LCD HD tv and there is a faint line that appears on the bottom half of the TV the line can only be seen when the picture is white or black….anyone know what this could be?
That’s just the backlighting leaking out around the edge of the LCD panel…occurs on all LCD panels…
Of course the TV station may be showing the first line of the Blanking/Sync/digital data bar that is normally hidden….you’d have to take that up with the station(s)….I’ve seen them on my TV too….
Which television technology is better for eyes? Plasma, LCD, LED or CRT.?
If a child wants to play game sitting at around six feet distance from the screen for say one hour, which tv will harm his eyes the most and which will be least harmful.
What’s wrong with existing LCD TVs?
Up until now, LCDs used fluorescent tubes to light the screen. As a result, LCDs have trouble creating deep blacks. That’s because fluorescent tubes are always on, and some light leaks through to the front of the display even when a part of the image is supposed to be black. A lack of deep blacks reduces the perceived sharpness of the set’s image.
Also, fluorescents lack a wide range of colors; hence, color saturation is limited.
What’s an LED TV?
It’s an LCD TV that uses LEDs to illuminate the display. There are two ways to do this: either by placing LEDs across the entire back of the display, or by placing LEDs just around the perimeter, which is called an “edge lit” display. Both techniques use less power than plasma TVs and LCD TVs lit with fluorescent tubes.
Which technique is better?
They both have their pros and cons. LCD TVs using edge-lit LCDs can be ultra-thin, because the LED sources are on the side. Edge-lit LED-lit LCDs are also less expensive than LCD TVs using LED backlit technology.
On the other hand, LCD TVs that use LEDs across the rear of the display can create sharply deeper blacks, through a technique called “local dimming.” When a scene calls for a dark image, the LEDs in that area can be shut off completely, so no light leaks through what should look black.
So if I want an LED-lit LCD, I should buy one using back-lit technology?
It’s not so simple. An LED back-lit TV may contain only about 1,000 LEDs. And those LEDs can only be dimmed in large groups, because it is too expensive to control each LED individually. So when you shut off or dim a group of LEDs you may also be darkening part of an adjoining scene on the TV that really should be bright. If you cut back on the dimming, then the blacks will be less dark than blacks in another part of the image that are not surrounded by lighter images.
Theoretically, you could increase the number of LEDs so that each lit just one pixel on the 2 million pixel LCD screen. But then you could just throw away the LCD screen because you would have actually created an LED television — just like the Walgreens LED sign in Times Square.
. Plasma and LCD technology – what’s the difference?
Plasma and LCD panels may look similar, but the flat screen and thin profile is where the similarities end. Plasma screens, as its name suggests, uses a matrix of tiny gas plasma cells charged by precise electrical voltages to create a picture. LCD screens (liquid crystal display) are in layman’s terms sandwiches made up of liquid crystal pushed in the space between two glass plates. Images are created by varying the amount electrical charge applied to the crystals. Each technology has its strengths and weaknesses, as you’ll read below.
2. Is there a difference in picture quality between plasma and LCD screens and normal CRT TVs?
It’s not what’s happening behind the screen that’s important – it’s how the screen performs as a television that matters the most. In that regard, both plasma and LCD sets produce excellent pictures, although many home entertainment specialists and gamers still say CRTs produce the best overall images (although plasmas and LCD sets are quickly catching up in terms of quality).
Those same home entertainment specialists will tell you that for basic home theatre-like usage, plasma screens have a slight edge over LCDs. This is because plasma screens can display blacks more accurately than LCDs can, which means better contrast and detail in dark-coloured television or movie scenes. The nature of LCD technology, where a backlight shines through the LCD layer, means it’s hard for it to achieve true blacks because there’s always some light leakage from between pixels. This is steadily improving with every new generation of LCD, however.
3. What advantages does plasma have over LCD?
Apart from better contrast due to its ability to show deeper blacks, plasma screens typically have better viewing angles than LCD. Viewing angles are how far you can sit on either side of a screen before the picture’s quality is affected. You tend to see some brightness and colour shift when you’re on too far of an angle with LCDs, while a plasma’s picture remains fairly solid. This is steadily changing, however, with more and more LCDs entering the market with viewing angles equal to or greater than some plasmas. Plasmas can also produce a brighter colour, once again due to light leakage on an LCD affecting its colour saturation.
Plasma pundits will also tell you that some LCD screens have a tendency to blur images, particularly during fast moving scenes in movies or in sports. While that was true for older generation LCD screens, newer models have improved significantly – so much so that the differences in performance between LCDs and plasmas in this regard is almost negligible (here’s a tip — if you’re shopping for LCDs, check the refresh rate. The lower it is, the better the image quality
whats the difference between plasma and LCD and which do you recommend?
Getting a 42″ TV, LCD or plasma? whats the difference between the two?
It’s not all doom and gloom for LCD though, as it has the edge over plasma in several key areas. LCDs tend to have higher native resolution than plasmas of similar size, which means more pixels on a screen. If you’re a true high-def junkie who’s keen to see every pixel of a high-res 1080i/p image reproduced pixel-by-pixel (providing you have a source that high, of course), then LCDs are the way to go.
LCDs also tend to consume less power than plasma screens, with some estimates ranging that power saving at up to 30 per cent less than plasma. LCDs are also generally lighter than similar sized plasmas, making it easier to move around or wall mount.
LCD pundits also point to the fact that LCDs have a longer lifespan than plasma screens. This was true of earlier plasma models, which would lose half of their brightness after more than 20,000 hours of viewing. Later plasma generations have bumped that up to anything between 30,000 and 60,000 hours. LCDs, on the other hand, are guaranteed for 60,000 hours.
You might have also heard that plasmas suffer from screen burn in, an affliction not as commonly associated with LCDs. Screen burn in occurs when an image is left too long on a screen, resulting in a ghost of that image burned in permanently. Newer plasmas are less susceptible to this thanks to improved technology and other features such built-in screen savers, but we still hear anecdotal reports here of burn-in with new plasmas.
When TV manufactures talk about EDGE LED are they referring to the slimline edge around the TV?
What is HDMI?
How can I go about transferring my DVDs to a USB stick?
Edge led means the led are lined up across the edge of the screen full led mean they are spread across the entire tv led are a improved version of lcd so it will often say led-lcd led are brighter produce more color have high hz for motion last longer than lcd and use less power. HDMI stands for high definition multimedia interface it is the best cable for hd and support 1080p/i 720p/480p. Hdmi cables transfer high def picture and audio through one cable and are better than componet. And usb sticks cant hold many movies unless you have a lot of space maby a portable harddrive would be better.
What is the difference in picture quality between an edge-lit LED TV and an LCD TV?
Edge lit uses fiber optics to route the light to the screen and the televisions are thinner. But the difference in length of the fiber near the edge to the center can sometimes cause inconsistent brightness across the screen.
Back lit televisions are thicker but can have slightly better/more consistant brightness.
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