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LCD is winning the race to be the dominant display technology for HDTV. According to DisplaySearch, in 2007, the market for LCD (liquid crystal diode) TVs was estimated at .4 billion. LCD TV shipments rose a stronger than expected 52% year to year in the second quarter of 2008 to nearly 7.5 million units (79.8% of total HDTV sales).

The LCD screen on a LCD HDTV is a selective light filter. It does not in itself emit light, but selectively filters light passing through the display from the back. Most HDTVs include either a single sheet of luminescent plastic or sidelighting with fluorescent lamps to provide the backlight. Both techniques are difficult to control.

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Many consumers focus on screen resolution when selecting a High Def (HDTV) system. Is this HDTV 720p, 1020i, or 1020p? However, when an expert group, the SMPTE (Society of Motion Pictures and Television Engineers), recently ranked the importance of screen resolution, it ranked fourth. The SMPTE ranked contrast ratio, color saturation, color temperature and grayscale ahead of screen resolution in importance. The Imaging Science Foundation reached a similar conclusion. Backlighting is the key component to improvement in contrast ratio and grayscale.

It is important that an LCD system allows for adjustment of the level of backlighting, and preferably, performs this function automatically. This will improve the contrast of the picture. Also, a reduced backlight level will also reduce power consumption and extend lamp life, as the power used and lamp lifetime is directly related to the backlight level. A lamp with a 50,000 hour lifetime at 6 milliamps may only have a 30,000 hour lifetime if the current is 7 milliamps, just 1 milliamp higher (Example: Sharp Electronics LCD Display).

Another important factor in the choice of backlighting is the consideration of “blur”. Blur occurs when there is rapid motion in the programming, such as sports. When the picture changes quickly, the pixels can lag in response. Effective backlight engineering can reduce this significantly by strobing the backlighting, so that the individual pixels do not remain lit longer than needed. Examples of this technique include the Philips “Aptura” and the Samsung “LED Motion Plus”.

Sidelighting

With sidelighting, the backlight is located in the back of the LCD panel, and to each side to create panel illumination. To make the light more uniform, a light diffuser is located between the lamps and the rear of the optical filter module. Most LCD systems that use sidelighting use cold cathode fluorescents (CCF) lamps. This technology provides a very bright white light. The lifetime of the lamps is usually between 10,000 to 20,000 hours (6-12 years at a rate of 5 hours of use per day).

The most important disadvantage is that the intensity of light cannot be varied locally, and sidelighting can look non-uniform. Some CCF lamps contain mercury. This is an ecological disadvantage.

The major drawbacks:

• The intensity of light cannot be varied locally. This results in a lower contrast picture.
• The light can be non-uniform.
• Some CCF lamps contain mercury.

Conventional Backlighting

Most backlighting is performed with a single sheet of electroluminescent plastic. These panels can age (though improvements in this area have reduced this problem). Electroluminescent Panel backlighting uses colored phosphors to generate light. Displays using this technique can be thin and lightweight, and provide even light distribution.

The major drawbacks:

• Limited life of 3,000 to 5,000 hours to half brightness (2-3 years at a rate of 5 hours of use per day).
• The intensity of light cannot be varied locally.

LED Backlighting

LED backlighting uses a matrix of LEDs that can be controlled individually to offer very good control. In this configuration, a large number of LEDs are mounted uniformly behind the display. Brightness improvements in LEDs have made them more practical for backlighting. NEC pioneered this technique with their monitor, the 2180WG. Other companies, such as Samsung, have recently introduced versions of this technology. This should push prices down (the Samsung model cost less than 1/3 the price of a comparable NEC monitor).

This system offers local dimming technology and can achieve 1,000,000:1 dynamic contrast ratio. True actual black levels (the “Holy Grail” of LCD) are attainable by shutting off a pixel’s light source. This can eliminate the grayish black picture typical of many LCD HDTVs. Groups of LEDs can be locally controlled to produce more light, increasing the brightness when necessary.

The problem with conventional white LEDs is that their spectrum is not ideal for photographic reproduction because they are basically blue LEDs with a yellow phosphor on top. Their color spectrum has two peaks, one at blue and another at yellow. White LEDs that are based on a group of red, green and blue LEDs are ideal for the RGB color filters of an LCD and can result in the most saturated colors. Sony’s “Triluminos” LED backlight system is an example of this technique.

Sometimes, these HDTVs have a row of LEDs across the top and bottom of the display. This improves the brightness and color reproduction, and enables almost complete uniformity across the display.

LED backlights are much more efficient that alternative techniques. And since the LED backlight waste less energy, less heat is generated, that must be managed with air conditioning. LED backlights offer a long operating lifetime of more than 50,000 hours (more than 25 years of use at a rate of 5 hours a day).

LED backlit systems may not show well in a typical retail environment. Typically, the screens are somewhat reflective in order to achieve the high contrast ratio, and subsequently, a brightly lit showroom may not flatter this technology. In a more typical less-lit environment, this problem should not be as noticeable.

Engineering Concerns

The electrical engineering is simpler with LED backlights. Cold cathode fluorescent lamps (CCF) require high AC voltages (1,500 VAC) at startup, and operating voltages of 700 VAC or more. When the lamp is new it may take much less voltage to start, but with age the voltage requirements usually increase, complicating a designer’s problem. An electroluminescent panel requires a voltage of about 100 VAC @ 400 Hertz.

A power inverter (to generate VAC) is needed for both CCF and electroluminescent panels to operate with a DC power supply. This is a significant expense, in cost, size, and weight of the system. The best inverter for this application permits the output voltage to automatically increase as the lamps age, extending the useful life of the lamps.

LCD systems with LED backlighting utilize low voltage DC, usually 12 or 24 VDC. This results in a smaller, simpler, and more reliable system. LED backlit systems must be well cooled or their performance can suffer. The LEDs generate less heat than CCF lamps, but the heat is very concentrated. Operating at high temperatures reduces the LED lifetime and shifts their light spectrum, while reducing output luminance.

OLED

A new technology that you will be hearing about in the future is Organic LED (OLED). This technology has a completely different backlight technology, it doesn’t need one. Because of this, they draw much less power. And because there is no backlight, an OLED system has a larger viewing angle than an LED system. An OLED display is much thinner than an LCD display. The response time for OLED is faster than normal LCD screens. An average of 8 to 12 milliseconds in response time is normal for a LCD compared to 0.01 milliseconds in response time for an OLED.

Sony introduced an 11″ HDTV at the Consumer Electronics Show in Vegas. The new 11″ Sony TV is called the “XEL-1″. It’s very thin (1/10″) and currently sells for 00. Samsung demonstrated a 31″ OLED HDTV with 1080P resolution at a tradeshow in Asia in November. LG, Toshiba, Matsushita (Panasonic), and others are investing hundreds of millions of dollars, developing this extremely promising technology. Toshiba has plans to sell a 30″ OLED display in 2009. Samsung has announced they will sell large screen OLED HDTVs in 2010.

OLED displays have already been used for some time in digital cameras, cell phones and other devices with relatively small panels, because they are very energy efficient, which is very important in portable devices.

In theory, OLED displays can be more inexpensively manufactured than LCD or plasma displays, meaning that they should not be as expensive. Remember that the first large LCD and Plasma displays were much more expensive when they were first introduced.

Summary

LCD HDTVs and monitors with LED array backlighting are now the approach of choice because they exhibit better image quality while saving power. The ability to locally control light output is key to achieving high contrast ratios.

LCD Backlighting For HDTV

Brian Bradshaw is a Certified Technical Specialist (InfoComm CTS). Areas of expertise include Video, Audio, Computation, HDTV, Satellite Systems, and Communications. He has a communications technology business in Plano, Texas (Dallas). More information can be found at his Website

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There’s a lot of talk these days about frame rates in the new HDTVs. The frame rate is simply the number of distinct images a TV screen can display in a second, and is also known as the display rate or “Hertz”. Hertz is the scientific unit for cycles per second, and is abbreviated “Hz”. The latest buzzword is “120Hz”, which means a display rate of 120 frames per second. This is twice as fast as most HDTVs are capable of (60Hz), so it ought to make the moving pictures look smoother. But, the human eye can only process about 20 to 25 distinct images per second, so why should it matter what the frame rate is, as long as it is faster than your eyes can see?

The answer comes when you realize that not all video is filmed at the same rate. Movies are usually filmed at a rate of 24 Hz, most TV is filmed at 30 Hz, and some sports events are now being filmed at 60 Hz.

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Some simple math will show the problem and reveal the solution. When a TV set wants to display 60 frames per second, and the cable TV company sends it 30 frames per second, that’s easy to deal with: the TV shows each frame twice in a row, creating an image made up of two consecutive frames. Each image will last exactly 1/30th of a second on the screen, and things will look perfectly smooth.

So what happens when your DVD player sends 24 frames per second to the TV, but the TV still wants to show 60 on the screen? This is a little slower than the cable TV frame rate, so if it simply shows each frame twice and then waits for the next one, there will be a black gap in between and the movie will look terrible. So, the TV needs to triple one frame, double the next, triple the following one, and so on, giving it a total of 60 frames to show each second. This is known as 3:2 Pulldown.

The 3:2 Pulldown trick works OK, but there is a problem. One image lasts a 20th of a second, then the next lasts a 30th. A 20th of a second is long enough for most people to tell that it’s really a static image, and when the camera pans around in a scene, things will seem to move unevenly. But if your TV is able to display 120 frames per second, it can take the 24 Hz input and simply show each frame 5 times in a row for a total of 1/24 (or 5/120) second per frame, with no variation from frame to frame. And when 30Hz video comes in, it displays each frame 4 times in a row, for a total of 1/30 (or 4/120) second per frame. Problem solved.

Now that frame rates are fast enough to display any kind of input smoothly, HDTVs not only have high resolution in the x and y (height and width) dimensions, but also in the t (time) dimension. As in all kinds of digital media, higher resolution means smaller units of data, and that means a more lifelike reproduction of reality. The 120Hz frame rate won’t be very common until 2008, but a few HDTVs already have it, like the Sony Bravia XBR4 series and the Sharp Aquos 92U series.

HDTV has certainly entered the fourth dimension (time), but has skipped the third (depth) in the process. Until we see start seeing holographic movies on DVD, we’ll have to wait for true four-dimensional TV.

HDTV Enters the Fourth Dimension – 120Hz Frame Rates

About the Author

Tom Webster writes for FlatHDTV.net [http://flathdtv.net] an online guide to the HDTV revolution.

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The KDL52XBR9 LCD HDTV is a top of the line HDTV brought to you by Sony. This 52 inch HDTV is black with silver borders giving it a very sleek look.

What Are the Specs?

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OK, for all the techno-types who like the details here you go:

16:9 Full HD 1080p Resolution Panel (1920×1080) – It can accept any HDTV signal and gives you optimum resolution so make sure you take full advantage of your Blu-ray Discs.

Motionflow 240Hz Technology – This allows the motion details and clarity to be at their highest levels. The frame rate is quadrupled giving you realistic experience in your viewing.

BRAVIA Engine 3 Fully Digital Video Processor – Enhanced algorithms provide a reduction in noise, better image detail which are sharp and life-like.

Live Color Creation Technology with WCG-CCFL Backlight-By working with the Bravia’s cold cathode fluorescent lamp, the Live Color Creation technology is able to give colors that are true and life-like.

USB to View Photos, Music, and Video-You can connect your camera, MP3 player (must be USB enabled) or a USB storage device and watch home video or look at pictures.

For All The Non-Techno Types Who Don’t Care About The Boring Details

Don’t worry I got you covered. In easy to understand straight talk here is what you get: You get an HDTV that provides you with life-like picture and excellent colors. Plus, you can watch on demand video from Amazon, YouTube videos, hook up your video recorder and watch your child’s latest game on the big screen, view photos or plug in your MP3 player (needs USB cable) and listen to music. Oh yeah, you can also plug in the Playstation 3! Now try and get the kids to stop playing video games all the time!

Sony Bravia KDL52XBR9 LCD HDTV – Is Sony’s Newest HDTV Worth the Money?

Is It Worth The Money?

Let’s face it, the Sony Bravia KDL52XBR9 comes with a pretty high price tag. If you have to choose between this and something vital to your house, well the choice is obvious. But if you have the funds and would like an HDTV that will give you true-to-life pictures and all the gadgets and gizmos that make any techno lover’s heart go pitter-patter, go to http://52inchkdl52xbr9.blogspot.com/, this HDTV is definitely recommended.

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Are you looking for buying a new theater surround sound system for your home or office? Do you hate all the wires and cables that need to be connected to each speaker and make your house look bad? Let me show you the new piece of Audio Electronics that is available and can make you a big favour if you have this problems. Now you can buy a new set of audio theater for inexpensive prices as low as 100$ who have the – wireless speakers! Yes, you won’t need to connect anymore your speakers now you got all on wireless, check out our article about the best wireless surround sound systems and check out our blog for more reviews on them…

The future is coming and Chinese engineers have brought us the new future technology speakers. With their latest products of 5.1, 6.1, 7.1 speakers they have already made a new thing in Electronic Technology but now they have brought us Wireless Surround Sound System. No more cables because the speakers work wireless, no more wires all over your house, today you will have your own home theater system in use of wireless! Currently on the market you can buy different brands of the home theater surround sound system in addition with wireless 2.4GHz rear speakers only, prices are inexpensive since this speakers are quality and a new generation of surround speakers for your home.

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The big and best brands already are selling them for really inexpensive prices so you can get them from brands like: Bose, Panasonic, Samsung, Creative Labs, Sony and others… The Wireless Surround Sound System is ideal for listening music, watching movies, gaming and more. No wires all over your house today you can have your own speaker theater wireless for amazing prices and here are the top products on the market which you can buy for the lowest prices only: Here are the top Wireless Surround Sound Systems:

1. Creative Labs GigaWorks 550W 5.1 System- Wireless Rear Speakers – Ideal for gaming, home theatre, PC use and MP3 listening – Powerful 36 Watts RMS, highly-efficient 3″ full-range satellite driver for greater sonic accuracy – Highly efficient 8″ front-firing long-throw driver and a 130Watts RMS subwoofer – Wireless transmitter/remote control
2. Panasonic SC-PT760 5.1 Speakers 1000 Watts – 5-disc DVD home theater system – Comes with 2 tallboy front speakers, 1 center speaker, 2 surround speakers and a Kelton subwoofer – Wireless Kit For Rear Speakers – Dolby Digital, Dolby Pro Logic and DTS decoders – Integrated Universal Dock for iPod – VIERA Link display
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5. Bose Lifestyle Wireless Surround Link – Included SL2 wireless surround link eliminates the need for running wires to the back of the room – Two 5.25″ woofers provide powerful bass from the Acoustimass Module – Bose link enables up to 14 additional rooms of sound, each with its own independent volume and mute control

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If you are interested in buying and getting more info, reviews and the cheapest prices go check out our blog about Wireless Surround Sound System and choose the system that suits you the most. We will help you choose the best Wireless Surround Sound Speakers right now!

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Over the last several years it has been the case that more and more Americas are looking to take advantage of Black Friday and Cyber Monday sales and deals. By doing research many customers are finding that they can get a HDTV at a very low price by simply being patient and waiting for these very popular TVs to go on sale. WalMart is the largest retailer in the world and they often offer great discounts when it comes to TVs on Black Friday and Cyber Monday. Before making any assumptions on what TVs will be in the ad paper it would be a good idea to look at past sales and see which companies were included.

WalMart has relationships with many television companies but the deals and sales that are offered on Cyber Monday tend to be quite consistent. When WalMart is buys these TVs in bulk it is usually done months beforehand and the lower prices are set even before the summer. With this being the case many customers will be able to gauge what types of TV sets will be on sale by simple seeing which parts of the shelves at WalMart of the most full.

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Many WalMart locations make sure to keep the overstock TVs in the back but you will likely see many stacks of merchandise start to come out at most major retailers. By simply looking towards the ceiling of WalMart, Best Buy or Target over the next few weeks you will find many of the Christmas items that are sure to be on sale during the big sale events of the year which often take place on Black Friday or Cyber Monday. Cyber Monday makes things a little bit easier as customers will not have to deal with the crowds like they will on the Friday after Thanksgiving.

As Christmas gift ideas are very popular during the next few months it will be the case that many people start to think about buying a TV for the man in their life. Saving some extra money on this TV purchase could help quite a bit when it comes to paying the bills during the holiday season. With WalMart often offering great discounts it might be the cheapest place to find a HDTV from Vizio, Samsung or Philips during the 2010 holiday shopping season. It would also be a smart decision to check out the sales and deals from Target, Best Buy and HH Gregg.

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Saving money by doing research on WalMart Cyber Monday TV deals [http://www.cybermondaydealsandsales.com/2010/10/24/walmart-cyber-monday-deals-on-a-tv-sales-on-2010-samsung-vizio-sony-and-philips-hdtvs-for-christmas/] Americans could save quite a bit of money on Christmas gifts. Remember that almost all retailers have good Cyber Monday TV deals online so make sure to check out all the major electronics stores.

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Sony Bravia EX700 Series 46-Inch LED HDTV, Black Review

Price : $1,699.99

Sony Bravia EX700 Series 46-Inch LED HDTV, Black Feature

• 46-inch LED HDTV with full HD 1080p resolution lets you take full advantage of HD sources like a Blu-ray Disc Player or PlayStation3 gaming console
• Ambient Sensor and LightSensor technologies automatically adjust the color and backlight based on a room’s lighting
• BRAVIA Internet Video for instant video and music streaming; Wi-Fi adapter ready; Motionflow 120Hz technology for smooth motion; USB port for photos, music and video playback; BRAVIA Sync controls compatible devices with one remote
• Inputs: 4 HDMI, 2 component, 2 composite, 1 PC, 1 USB, 1 Ethernet, 1 optical digital audio output
• Includes removable stand; measures 44.125 x 28.75 x 11.125 inches with stand

Sony Bravia EX700 Series 46-Inch LED HDTV, Black Overview

Enjoy Full HD 1080p, incredible contrast and smooth motion performance with the slim Edge LED backlit Sony BRAVIA EX700-Series LCD HDTV. Connect to the internet and instantly stream a wide variety of movies, TV shows, videos and music using apps from Netflix, Amazon Instant Video, YouTube, Slacker and more

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Customer Reviews

*** Product Information and Prices Stored: Dec 27, 2011 01:02:29

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