HDTV is really worth waiting for!
If you’re planning an HDTV purchase this fall (or looking ahead to one this winter), keep an eye out for two emerging technologies. 1080p is now everywhere, LCD HDTVs are taking over, and 40-inch displays are evolving into the new sweet spot. But new sets slated for this fall and winter are will be among the first mainstream displays to incorporate several new technologies that can significantly improve picture quality.
Samsung, for example, recently showed off its latest lines of LCD HDTVs due out in August. One line sports a 120-Hz refresh rate–double the 60 Hz of standard LCD TVs–which makes for sharper fast-moving images. Another line uses LED backlights, which dramatically boost contrast and allow for a wider range of colors.
Both technologies should be available from a wide variety of vendors this fall, including LG Electronics, Philips, and Sharp. And as these enhancements make their way into more and more TVs, the price difference between standard LCD TVs and these newer models should shrink rapidly. Here’s a look at Samsung’s plans for 120-Hz HDTVs and LED backlighting, and why you might want to wait for a television that makes use of either technology.
120-Hz Displays
Momentum behind 120 Hz has been building since early this year. JVC was among the first vendors to ship a 120-Hz display, and Sharp’s Aquos D82U and D92U series televisions began shipping back in February. This summer, Philips, LG, and Samsung all announced their respective 120-Hz technologies, with products coming by this fall.
At 120 Hz, the television’s refresh rate is double the previous standard rate for displaying video content. By doing so, it can smooth out any residual motion blur that results from fast-moving action found in such content as sports and a scrolling news ticker on the bottom of the screen. Video content is filmed at 30 frames per second, which means such content is best shown at 60 Hz or 120 Hz.
Samsung showed a split-screen demonstration of its 120-Hz technology at an event here in San Francisco, with one side showing the 120-Hz technology, and the other side showing 60 Hz. The difference between the two was noticeable: At 120 Hz, the ticker moved more smoothly and fast-moving video appeared sharper.
The 71 series displays that Samsung is launching in August use a technology called McFi–short for Motion Compensated Frame Interpolation–to create new interpolated video frames and insert them between each frame of video to smooth out fast motion. Samsung’s technology looks for any movement, then it creates an average of those movements to insert a frame in between them. Other HDTV makers insert a black frame in between frames, an approach Samsung claims fixes the motion-blur issue, but degrade the panel’s brightness.
LED Backlighting
If you’re less concerned about fast-moving images, a display with an LED backlight may be more to your liking. The big advantage to LED-backlit TVs is improved contrast ratio. Samsung says its 81 series of displays can automatically adjust the backlight for specific parts of the picture, depending upon the source content. This allows the display to achieve deeper blacks and crisper whites than can be achieved with the Cold Cathode Fluorescent Lamp technology (CCFL) traditionally used by LCD HDTVs.
In CCFL, the tubes light up the back of the display; those tubes can be all on, or all off, and they allow some degree of light leakage. But LED backlighting allows a greater degree of control, which enables Samsung to claim a dynamic contrast ratio of 100,000:1, a four times improvement over its CCFL displays.
Price Premiums
While 120-Hz displays won’t be that much more expensive than standard 1080p displays are today, you will pay a premium for an LED backlit display. The 40-inch model in Samsung’s 120-Hz 71 series line should retail for $2699 when it ships in August, for example, while Samsung’s 40-inch LED backlit model from the 81 series will go for $2999.
At least with TVs in that price range, other key HDTV technologies have become standard. A year ago, 1080p resolutions were still a rarity–and available in to higher-end models only. As we head into the fall, 1080p is de rigueur on HDTVs at sizes of 40 inches and up. Samsung, for example, will have only three non-1080p models going forward in that size range. HDMI 1.3 is also getting more pervasive across a wide spectrum of LCD (and for that matter, plasma) displays.
P.S.
High-definition television (HDTV) is a digital television broadcasting system with a significantly higher resolution than traditional formats (NTSC, SECAM, PAL). While some early analog HDTV formats were broadcast in Europe and Japan, HDTV is usually broadcast digitally, because digital television (DTV) broadcasting requires much less bandwidth. HDTV technology was first introduced in the US during the 1990s by a group of electronics companies called the Digital HDTV Grand Alliance.
Advantages of HDTV in nonengineering terms
High-definition television (HDTV) potentially offers a much better picture quality than standard television. HD’s greater clarity means the picture on screen can be less blurred and less fuzzy. HD also brings other benefits such as smoother motion, richer and more natural colors, surround sound, and the ability to allow a variety of input devices to work together. However, there are a variety of reasons why the best HD quality is not usually achieved. The main problem is a lack of HD input. Many cable and satellite channels and even some “high definition” channels are not broadcast in true HD. Also, image quality may be lost if the television is not properly connected to the input device or not properly configured for the input’s optimal performance.
Almost all commercially available HD is digital, so the system cannot produce a snowy or washed out image from a weak signal, effects from signal interference, such as herringbone patterns, or vertical rolling. HD digital signals will either deliver an excellent picture, a picture with noticeable pixelation, a series of still pictures, or no picture at all. Any interference will render the signal unwatchable. As opposed to a lower-quality signal one gets from interference in an analogue television broadcast, interference in a digital television broadcast will freeze, skip, or display “garbage” information.
With HDTV the lack of imperfections in the television screen often seen on traditional television is another reason why many prefer high definition to analog. As mentioned, problems such as snow caused from a weak signal, double images from ghosting or multi-path and picture sparkles from impulse noise are a thing of the past. These problems often seen on a conventional television broadcast just do not occur on HDTV.
HD programming and films will be presented in 16:9 widescreen format (although films created in even wider ratios will still display “letterbox” bars on the top and bottom of even 16:9 sets.) Older films and programming that retain their 4:3 ratio display will be presented in a version of letterbox commonly called “pillar box,” displaying bars on the right and left of 16:9 sets (rendering the term “fullscreen” a misnomer). While this is an advantage when it comes to playing 16:9 movies, it creates the same disadvantage when playing 4:3 television shows that standard televisions have playing 16:9 movies. A way to address this is to zoom the 4:3 image to fill the screen or reframe its material to 14:9 aspect ratio, either during preproduction or manually in the TV set.
The colors will generally look more realistic, due to their greater bandwidth. The visual information is about 2-5 times more detailed overall. The gaps between scanning lines are smaller or invisible. Legacy TV content that was shot and preserved on 35 mm film can now be viewed at nearly the same resolution as that at which it was originally photographed. A good analogy for television quality is looking through a window. HDTV offers a degree of clarity that is much closer to this.
The “i” in these numbers stands for “interlaced” while the “p” stands for “progressive”. With interlaced scan, the 1,080 lines are split into two, the first 540 being “painted” on a frame, followed by the second 540 painted on another frame. This method reduces the bandwidth and raises the frame rate to 50-60 per second. A progressive scan displays all 1,080 lines at the same time at 60 frames per second, using more bandwidth. (See: An explanation of HDTV numbers and laymens glossary)
Dolby Digital 5.1 surround sound is broadcast along with standard HDTV video signals, allowing full surround sound capabilities. (Standard broadcast television signals usually only include monophonic or stereophonic audio. Stereo broadcasts can be encoded with Dolby Surround, an early home video surround format.) Both designs make more efficient use of electricity than SDTV designs of equivalent size, which can mean lower operating costs. LCD is a leader in energy conservation.
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