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About Lcd Television

Liquid crystal display television (LCD TV) is [television] that uses [Liquid crystal display] technology for its visual output. The technology used is generally [Thin-film transistor]. In the early 2000s, LCD [Flat panel display] captured a large part of the [Computer display] market from traditional [Cathode ray tube]s. Continuing advances in LCD TV technology enable it to compete against [Plasma display] [Flat panel display] and rear-projection televisions ([DLP], [LCD projector], and [Liquid crystal on silicon]) for large-screen [HDTV].

Early LCD television had drawbacks relative to traditional visual display technologies. It displayed fast-moving action with "ghosting" and could be viewed best only when looking directly at the screen or from a slight angle. Most of these problems were solved in recent years, and LCD televisions, along with plasma displays, have become more popular worldwide than cathode ray display televisions. The LCD design is also known for being more energy efficient than the CRT design.

For a long time it was widely believed that LCD technology was suited only to smaller sized [Flat panel display], and could not compete with plasma technology at sizes of 40" or larger. At the time, plasma held the edge in cost and performance. Presently, LCD TV's can offer the same performance with the announcements of seventh-generation panels by major manufacturers such as [Samsung], [Sony], [LG.Philips LCD], and [Sharp Corporation]:

In October 2004, 40" to 45" televisions were widely available, and Sharp had announced the successful manufacture of a 65" panel.
In March 2005, [Samsung] announced an 82" LCD panel.
In August 2006, [LG.Philips] Consumer Electronics announced a 100" LCD television
In January 2007, [Sharp Corporation] displayed a 108" LCD panel branded under the [AQUOS] brand name at [International Consumer Electronics Show] in Las Vegas.

Manufacturers have announced plans to invest billions of dollars in LCD production over the next few years, with televisions expected to be a key market. (The other main market for LCD displays is in [Computer display].)

Improvements in LCD technology have narrowed the technological gap with plasmas. The lower weight, falling prices, higher available resolution which is crucial for [HDTV], and lower electrical power consumption of LCDs make them competitive against plasma displays in the television set market. As of late 2006, analysts note that LCDs are overtaking plasmas, particularly in the important 40" and above segment where plasma had enjoyed strong dominance a couple of years before.

LCD Technology LCD technology is based on the properties of [polarization] light. Two thin, polarized panels sandwich a thin liquid-crystal gel that is divided into individual pixels. An X/Y grid of wires allows each pixel in the array to be activated individually. When an LCD pixel darkens, it polarizes at 90 [degree (angle)] to the polarizing screens.

This pixel has darkened. The pixel darkens in proportion to the voltage applied to it: for a bright detail, a low voltage is applied to the [pixel]; for a dark [shadow] area, a higher voltage is applied. LCDs are not completely opaque to light, however; some light will always go through even the blackest [LCD] pixels.

Developments in LCD televisions TVs based on [TFT LCD#PVA] and S-PVA LCD panels deliver a broad angle of view, up to 178 degrees. They also deliver an adequate [contrast ratio] for viewing bright scenes, as well as dark scenes in bright rooms. The [dynamic contrast#Dynamic contrast ratio] technique improves contrast when viewing dark scenes in a dark room. Alternatively, some manufacturers produce LCD TVs that throw light on the wall behind it to help make dark scenes look darker. PVA and S-PVA panels generally have difficulty with ghosting when going between different shades of dark colours, however in new televisions this is compensated to some degree using a technique called overdriving.

Moving pictures on a CRT TV do not exhibit any sort of "ghosting" because the CRT's phosphor, charged by the strike of electrons, emits most of the light in a very short time, under 1 ms, compared with the refresh period of e.g. 20 ms (for 50 fps video). In LCDs, each pixel emits light of set intensity for a full period of 20 ms (in this example), plus the time it takes for it to switch to the next state, typically 12 to 25 ms.

The second time (called the "response time") can be shortened by the panel design (for black-to-white transitions), and by using the technique called overdriving (for black-to-gray and gray-to-gray transitions); however this only can go down to as short as the refresh period.

This is usually enough for watching film-based material, where the refresh period is so long (1/24 s, or nearly 42 ms), and jitter is so strong on moving objects that film producers actually almost always try to keep object of interest immobile in the film's frame.

Video material, shot at 50 or 60 frames a second, actually tries to capture the motion. When the eye of a viewer tracks a moving object in video, it doesn't jump to its next predicted position on the screen with every refresh cycle, but it moves smoothly; thus the TV must display the moving object in "correct" places for as long as possible, and erase it from outdated places as quickly as possible.

Although ghosting was a problem when LCD TVs were newer, the manufacturers have been able to shorten response time to 2ms on many computer monitors and around an average of 8 ms for TVs.

There are two emerging techniques to solve this problem. First, the backlight of the LCD panel may be fired during a shorter period of time than the refresh period, preferably as short as possible, and preferably when the pixel has already settled to the intended brightness. This technique resurrects the flicker problem of the CRTs, because the eye is able to sense flicker at the typical 50 or 60 Hz refresh rates.

Another approach is to double the refresh rate of the LCD panel, and reconstruct the intermediate frames using various [motion compensation] techniques, extensively tested on high-end "100 Hz" CRT televisions in Europe.

The best approach may be a combination of two, possibly allowing the viewer to switch them on or off when viewing video- or film-based material.

Some manufacturers are also experimenting with extending colour reproduction of LCD televisions. Although current LCD panels are able to deliver all [sRGB] colours using an appropriate combination of backlight's spectrum and optical filters, manufacturers want to display even more colours. One of the approaches is to use a fourth, or even fifth and sixth colour in the optical colour filter array. Another approach is to use two sets of suitably narrowband [backlight]s (e.g. [LED]s), with slightly differing colours, in combination with broadband optical filters in the panel, and alternating backlights each consecutive frame.

Fully using the extended colour [gamut] will naturally require an appropriately captured material and some modifications to the distribution channel. Otherwise, the only use of the extra colours would be to let the viewer boost the colour saturation of the TV picture beyond what was intended by the producer, but avoiding the otherwise unavoidable loss of detail ("burnout") in saturated areas.

See also

[Ambilight]
[ATS euro plus]
[Comparison of display technology]
[DLP]
[Digital Terrestrial Television]
[picture in picture]
[Pixel Plus]
[Plasma display] Panel Television (PDP TV)
[Progressive scan]
[Teletext]
[Television]
[touch screen]
[Wake-up] and [sleep timer]
[Wide XGA], [SVGA] and [DVI] PC interfaces

External links

Plasma.com LCD TV vs PDP TV vs DLP TV

Information Reference: Wikipedia.org

Lcd television

Questions and Answers

LCD Television?

Q) What are the pro's and con's of LCD tellys?

A) The LCD is a great technology. It really depends what you are using your TV for, and also, how much money you are wanting to spend. First, if you or anyone else are planning on playing video games on this TV, you do not want to buy a Plasma, or a regular rear projection TV (I don't think you can really find those in stores anymore anyway). You will definitely want either LCD, LCD Projection, or DLP. The Plasma is currently the best in terms of overall picture quality, but it is the most expensive design there is. You will be paying a lot of money for one. Another drawback is that it uses little cells filled with gases that become excited by electrical pulses which makes up the picture on the TV. Eventually these gases will dye out, and the cell will dye causing the image on the TV to slowly fade out as the TV gets used more and more. The life of the TV depends on how much TV you are going to watch. When I worked at Circuit City a guy had bought an 8 thousand dollar Sony Plasma that he never turned off once he got it home. The TV was dead in just a shade under a year. So if you watch a lot of TV, or plan on keeping it on all the time, I wouldn't recomend one unless you have a lot of money and don't care. Plasmas are also prone to screen burn, which makes them bad for video games. If you leave an image frozen on the TV for a lengthy time, you will see the image burned onto the screen. DLP's and LCD Projections are cheaper than bigger LCD's, but the image is a little darker, and you can't see the image on the TV as good if you aren't sitting directly in front of the TV. There is also a lamp that will have to be changed out ever couple of years depending on how much TV you are watching. Those lamps cost around 300 dollars a piece. But, you can play video games on them because they do not burn images on the screen, and they are more available in some of the larger screen sizes than regular flat panel LCD's. If the lamps are replaced as needed, a LCD/DLP TV are said to last a lot longer than a CRT TV (the glass box TV's we've been using for the last half century or more). Finally LCD's have all the benefits of the DLP's and LCD Projection TV's. There is no screen burn so you can play all the video games you want, they last a lot longer than the regular CRT TV, and they are still cheaper than a Plasma. But unlike the LCD Projection/DLP they can be seen at all angles just like a regular TV, there is no lamp you will have to replace every couple of years, and the colors are much brighter. The only drawback you hear people talk about is that LCD's can have some problems keeping up with fast movement on the screen. It sometimes pixels a little or distorts for instance if you are watching a race and see cars buzzing by, the TV might have a little trouble keeping up with the images, but the technology has improved and this is becoming less of a problem now. Anyway, that's your current TV tech in a nutshell. Hope that helps.

LCD television?

Q) Hello I've just bought my first lcd telly its 32 inch.When you sit near the screen ( two-three feet) the picture looks slightly blurred.When you sit further away the picture seems ok.Is this normal ? Thanks for any advice.

A) mick, you are looking at the screen to close, the best viewing distance is measure the width of the screen, and times that by 31/2 - 4 that will then give you the optium viewing distance, therefore the best picture wg

Will any LCD television display a 60hz picture from a video game?

Q) I want to know if any LCD television will display a 60hz picture in full quality. If not, please direct me to a UK site which sells 60hz compatible TVs Thanks

A) It should do, as 60Hz is practically standard for TVs these days. I know for a fact that my games work in 60Hz on my Sony Bravia 20" LCD. This is also the only frequency that it will display my PC input, with full quality

What's the best budget LCD HD 32inch television to buy in the UK?

Q) I'm looking into buying a HD LCD television and would like it to be 32 inches. Preferably near the £400 mark and a brand that is reliable. Built in Freeview would be a bonus and wouldn't mind paying a bit more so that it has it. I realise that's a tough task but just in case anyone knows of any great deals around... I have seen these guys. They show lots of good customer feedback but then they probably wouldn't have bad ones on there? It's Evesham which I have heard of before I think to do with computers- anyone know if they'er ok? here's a link: http://www.lowestonweb.com/products/info.asp?e=1C3411D9-63BD-42B9-94D7-5476AC67A19E

A) You're unlikely to find a good LCD under £500. If you're willing to take a risk on a generic brand, try Tesco. The best budget brand-name LCDs are made by Sharp. The GD8E range are very popular, and rate really well, despite being around £100 cheaper than their competitors. http://www.cramptonandmoore.co.uk/lc32gd8e-i1157.html

Do we buy a Plasma or an LCD television?

Q) We've decided to go for a 40 or 42 inch screen and both plasma and LCD models are available. We are going to install Sky HD as well as we watch a lot of sport. I've heard that LCD is here to stay and that plasma will eventually disappear, a bit like the old Betamax videos did. I've also been told that Sony Corp. ONLY do LCD televisions now. Any info or advice would be greatly appreciated.

A) up to 42" lcd are far better. above this some people say plasma have a slight edge. if you intend gaming on it avoid plasma. the best on the market at present is the sony bravia range.

HD/LCD television?

Q) Is it worth getting a HD LCD/ OR JUST LCD TV ?

A) jon, with today every thing gonna be HD ready,

LCD Television picture quality, can anyone help?

Q) I have just bought a 40" Sony LCD TV (which was not cheap!) and the picture quality is not as good as you would expect. The edges of people seem quite fuzzy. It has built in Freeview so is digital, any ideas!?

A) Sounds like your bitching about the Low Definition Picture being crappy..... Well......it's LOW DEFINITION!! Even on Digital it's going to stay Low Definition.... It'll be low definition the day you die...You can't change it... If they could, "I Love Lucy" would be Hi Def and in Color!!

pc/lcd television?

Q) i have a vga connection on my computer but i dont have one on my lcd tv...it only has HDMI and dvi connection is there a cable i can buy so that i can use my tv as a monitor for my pc. please help.......thanks

A) Read all the answers here, then read mine here: http://answers.yahoo.com/question/index?qid=20070414075556AAsP1zk&r=w&pa=FZptHWf.BGRX3OFMhjJTWE2JlbmOv0UpnQy2VxReqjGdTNCL2A--&paid=answered#NbUvWjC1WDI4B9CezxQo

SAMSUNG lcd television R32 problem?

Q) Has anybody else had a problem with a R7 32 samsung television, mine had a faulty on/off switch which deleloped after just 3 months. Comet dragged their heels at first but then replaced the set. However I am worried the problem may develop again.

A) Don't worry you have a great tv. I leave mine on 24/7 so the on/off switch has only been used once.....great

how do i hang a lcd television above my fireplace without any wires showing and have my cable and dvd connecte

Q) i dont want any wires showing but want to hang a lcd telly above my fireplace and still have my dvdplayer and cable connection what would i need and how would i do this plus would the heat from the fire effect the life of the tv

A) youd need to cut the plaster out insert some conduit replaster and paint and run the cables through the conduit id use 4 inch flat with curved corners above the fire place is ok if you allow the rear of the lcd to have air to keep it cool

What LCD television should I get in the 40-42 inch range?

Q) I am shopping for an LCD television, in the 40 to 42 inch range. Are there any brands or factors I should consider? I will be building a home theater, used for movies and video games.

A) Sony V Series are 1366x768. Only the X and W series are 1920x1080 (1080i). Don't have complaints about Samsung, in fact what most people don't know is that the major brands share the same quality standards so saying that one major brand set is more likely to have problems is just a matter of bad luck with that kind of brand.

removing smudges off a lcd television?

Q) recently bought a lcd television, two days later there appeared to be something what looked like liquid spilt on the screen. no one has owned up to spilling anything , tried to lightly rub it off but it has made smudge marks , any ideas please.

A) Use plain water and a soft lint free cloth. I use a plain white t-shirt. This works fine on my lcd with my kid running around getting smudges on it!

Could I buy a HDTV LCD Television without having a hd terminal, (if i only have a regular cable tv terminal).?

Q) I want to buy a flat screen tv (32" HDTV LCD Television) i dont plan on getting an hd terminal any time soon, because this will be a tv for my room and so i dont need any hd there. So i have a reguar cable that connects to the tv (the one that you have to screw in) and it give me like 60 channels, but not any hd programming. I want to know if its a good idea to get a HDTV if i dont plan on using the HD of it?

A) Your tv will connect up fine, as it seems like you know this already. I want you to know that there is no such thing as an HD "terminal" and that the HD channels that your cable company offers come through the same cable, they are just digital signals instead of analog. If you have digital cable already, I suggest getting an HD cable box. This will make your viewing experience a lot better. If you are not willing to do that, then you do not need to worry about spending the money on an HDTV right now. I would also like to mention that there are 32" LCD tvs that have a sticker on them that say "DCR", which means digital cable ready and this will allow you to get digital cable channels on the TV. I know what you mean about not needing HD in your bedroom. Many people are getting HDTVs and HD cable boxes for their family or living rooms and waiting until later to get it around the house, which reminds me of how TVs themselves went from just in the living room into multiple rooms in the house in the 1970s and 1980s. Standard shows will not look right on an HDTV as the picture is in a more square format. Hence, the name widescreen for HDTVs. This will be the standard of the future, but for right now, you will either have black bars on the left and right of your screen when displaying standard definition shows or you will stretch the image to fit the wide screen and everyone will look fat on the TV or you will zoom in and cut off the top and bottom of the broadcast. Basically, HDTVs are made for HD and SDTVs are made for SD. I love my HD set, but I wouldn't rush into anything now.

how do I hang an lcd television on an older brick wall?

Q) I basically want to hang an lcd television on the wall of an older ny apartment with brick walls. Any recommendations?

A) I would use a brand of fastener known as a TapCon. Basically, you drill a hole in the mortar (the stuff between the bricks). Then you put the mounting bracket on the wall using the TapCon screws. You can buy an entire kit for the installation at your local Home Depot. Just ask the hardware guy for a tapcon kit. He'll show you what you need. BTW, you'll also need a drill/driver for the holes. If it were me, I'd take the bracket to Home Depot to show them what you are mounting.

Is this LCD HDTV (Samsung LN-R238W Television)good for XBOX360?

Q) Ive heard theres ghosting effect with fast moving images and even when u sit very close to the tv with LCD televisions. Is this TV like that too?

A) Right now, if you have the cash. The Sony Bravia LCD line up is the way to go. If you don't have that much money to drop, then the Sharp Aquos LCD line up is the second best. If they are still too much, the Westinghouse LCD line up is a great entry level budget way to go. Samsung did a good marketing thing, getting Microsoft to use their TVs. This got a lot of people interested in and/or thinking that Samsung is the best TV out there.

Can I use an LCD television effectively as a computer monitor?

Q) I am looking for a large second monitor for the office, and was wondering if the smaller LCD HDTV televisions out there could do a comparable job to a 22 or 24 inch digital flat panel display?

A) Yes you can! there is a wire which connects the TV to the CPU. Good for you, cuz you have an LCD.

can i play ps2 on a coby lcd hd television or would it cause any damage?

Q) would playing video games on a coby lcd tv cause any damage? is it just intended for watching television and not for playing?

A) If you have the correct inputs on your Coby TV (you don't give the model number), you can play your PS2 on it with out a problem.

CRT vs LCD television which is better I think a Crt would win would you agree?

Q) Here are facts to prove this 1) better colors in a CRT tv while this is lacking in a lcd 2) Refresh Rates absent in Lcd while crt has the best refresh rates 3) Crts can be viewed from all angles where as head on viewing compulsary for better pictures in Lcd 4) Price

A) I disagree! CRTs are analog. This makes control over colors harder than with the digital interface of a LCD (I'm referring to the electronic signal to the screen, and not the video input). Contrast on the other hand is not as good in LCDs, this is caused by the back light in the display. It is always on which makes the blacks not so black. However, that is soon changing. The back lights are evolving from florescent tubes to LEDs. With the LEDs, there is now the ability to turn off the light behind black areas, fixing the problem. Granted feeding video into the back light to do this, has only been around for a few months, and hasn't hit the shelves yet, but it soon will. Refresh rates in LCDs are limited to response times which are already down to 8mS allowing a refresh rate of 125Hz. You eye couldn't even see something that fast. 30 Hz is the minimum, 60 Hz is ideal. Any faster is unnecessary. Besides, most video standards are no wheres near the speed of an LCD. As far as viewing angles go, I can see a clear picture on my LCD up to 180 degrees. You cant get any better. True some older displays were not that good, but that has changed. I think the only thing CRTs have over LCDs is the price. But for the weight, I still rather have an LCD. And don't worry, the prices have been rapidly falling as well.

LCD television question?!?!?

Q) i dont know if my LCD is HD or not because it was a gift and i cant ask that person who gave it to me @ the time...I want to know is there a way to identify if it is HD compatable..... NOTE: I SAW AN HDMI INPUT

A) LCD TV usually already in HD, for sure you can read the manual or browse the net. If it's HD ready it can support HD signal like 1080i, 720p.

New LCD Television vs. two young children - help?

Q) We just bought a 32" LCD tv. I have a 3-yr old and a 1-yr old. We need a TV stand or entertainment system or something for the tv and components (VCR, DVD player, 2 cable boxes, and some other box.) I'm worried about getting the typical stand where the TV is on top and everything else is housed underneath because I'm afraid the children will either knock into the tv and ruin the screen (don't know if that's even possible) or worse, be able to knock the tv right off the table or stand or whatever. We don't have a lot of money for a huge entertainment system. Just maybe one we can put together ourselves, but it's hard to find one large enough for the tv (need about 40" across just for the tv). Anyway, does anyone have any ideas on how to set up the tv as to not pose a danger to the kids or have the tv ruined in a day??

A) we have a 3 yr old,and was worrying about the same thing so we bought a wall mount and made shelves to hang on the wall for the other devices.