Mark Best

Vizio's 55-inch, LED-backlit VF551XVT gives great black levels for less.

(Credit:
Sarah Tew/CNET)

We’re willing to bet that when Vizio announced the VF551XVT back in January, plenty of savvy HDTV bargain hunters marked down “June” as the time they’d buy this 55-inch LED-based LCD. Then …

This TiVo-in-a-box comes with everything you need for PC DVR goodness.

(Credit:
Nero)

It’s been awhile since I’ve sung the praises of TV tuners, which let you watch and record shows on your PC, TiVo-style. Well, now you can get more than just the style: Nero’s LiquidTV TiVo PC brings the actual TiVo software to your system….

Originally posted at The Cheapskate

A firmware upgrade for early models of the Toshiba SV670U is now available.

(Credit:
Sarah Tew/CNET)

When I reviewed the Toshiba SV670U series nearly two months ago, the review was based on the second of two review samples. Let’s call them T1 and T2.

Why the need for a second sample? T1 suffered from a pretty glaring problem in my opinion. In certain scenes, parts of the local dimming LED backlight would flash intermittently and at random. Here’s how I put it in my original draft of the review:

The Toshiba had a propensity to interrupt dark areas with brief flashes of brightness that were confined to small zones on the screen. The instance we noticed first was during the demonstration sequence from “Digital Video Essentials: HD Basics” (around the 2:50 mark).

When the computer-generated plants fade in from black, flashes appeared in the lower left and upper left of the black background as the overall brightness of the scene increased. When watching “Austin Stevens, Snakemaster” on Discovery HD Theater, we saw brighter flashes, akin to blooming, in the darkness around Austin’s head as he leaned toward the light in a cave.

During “Watchmen” the flashes also appeared occasionally and for no reason we could discern. In the initial fight, for example, the lower-left corner flashed briefly just as the Comedian’s blood drips down onto the smiley-face pin. A zoom in to President Nixon created another flash in the lower right. Our guess is that LED elements were lighting when they’re not supposed to.

When we talked to Toshiba about what we saw, the company insisted on sending T2, which didn’t suffer from the flashing issue. We mentioned the problem with T1 in the review, telling readers we’d update the situation when we knew more.

Now we do. …

Though more computers have been landing in living rooms, digital TVs are adding new features to help them hang onto their role as the family’s entertainment center, says a report released Tuesday by In-Stat.

As DTVs replace old analog sets throughout the world, manufacturers are beefing them up with …

The Sharp LC-LE700UN series uses less power than any TV we've tested.

(Credit:
Sarah Tew/CNET)

LCD TV makers have always charged a premium for LED backlighting. In fact, the first LED-based LCD TV Sharp released, the inch-thick XS series, debuted last year at a cool $11,000 …

DisplayMate's testing lab during the LCD evaluation.

(Credit:
DisplayMate)

I’ve been testing LCD monitors consistently for the past two years. In that time, I’ve run various tests designed to evaluate a monitor’s response time. I’ve used games, movies, and the occasional scientific test to confirm if a manufacturer’s claimed response time is accurate.

To be perfectly honest, I have a very difficult time seeing motion blur in movies and games. In fact, I’m not sure I’ve seen it any repeatable evidence of it on a modern monitor during a game or movie.

So it should go without saying that DisplayMate‘s recent findings on LCD response times come as no big shock to me. The findings come via an article by DisplayMate founder Raymond Soneira.

Here are Soneira’s major conclusions based on tests conducted by DisplayMate on LCDs from major manufacturers.

1. A manufacturer’s claimed response time specifications are not a scientifically accurate or a meaningful indicator of picture blur.

The motion blur DisplayMate measured on the HDTVs tested was more than 40 milliseconds. According to the article, this is more than a factor of 10 greater
than the manufacturer’s published specifications.

2. LCD manufacturers have made a big deal about refresh rates in the last couple of years with the jump from 60Hz to 120Hz and now 240Hz. CNET’s own David Katzmaier suspected that benefits with the jump to 240Hz were dubious already, but here’s more evidence to back it up.

…

I’ve written articles in the past explaining various TV technologies, including the differences between 720p and 1080p and 120Hz and 240Hz LCD TVs. But with Samsung, LG, Sony, and other manufacturers pushing so-called LED TVs these days, it’s high time that I–with an assist from our resident video guru, David Katzmaier–sort through all the marketing mumbo jumbo and provide some insight into just what an LED TV is. Here goes.

1. An LED TV is not a new kind of TV.

I appreciate a good marketing ploy as much as the next guy, but an LED TV is just an LCD TV that’s backlit with light-emitting diodes (LEDs) instead of standard cold-cathode fluorescent lights (or CCFLs). And while they’ve become best-known this year with Samsung’s ultrathin models, LED-backlit LCDs have been on mainstream store shelves since 2007, when Samsung’s LN-T4681F debuted.

Unlike plasma and OLED, which are emissive technologies where each pixel is its own discrete light source, LCD is a transmissive technology where each pixel has to be illuminated from behind, or backlit.

2.There are two types of LED backlighting.

Initially, LED-based displays like the Samung LN-T4681F were backlit by what’s referred to as a “full array” of LEDs behind the LCD across the back of the panel. But to create superthin TVs, engineers needed to eliminate that extra layer of LEDs and move it to the sides of the display. With this form of backlighting, the LEDs are affixed to all four sides of the TV and light is projected inward to the middle of the TV via “lightguides.” These types of TVs are commonly referred to as “edge-lit” LED-based LCDs.

Samsung is the main maker of such sets this year with three series of edge-lit sets, although Sony did release one model earlier this year, the KDL-40ZX1M, and has another flagship series, the KDL-XBR10 models, waiting in the wings. Samsung, Sony, Sharp Toshiba, LG, and Vizio all have non-edge-lit, or “full array” models, available today. See our comparison of edge-lit vs. local dimming for more info.

3. Of the two, local dimming can produce deeper black levels, but also creates “blooming.”

Local dimming LED backlights can dim or turn off individually as needed.

The type of backlighting can impact how deep a shade of black a TV can produce. All current LED-based LCDs with rear-placed, “full-array” LED backlighting–except the Sharp LC-LE700UN series–feature a technology called “local dimming.” With local dimming, specific areas of the backlight can be dimmed or brightened when different areas of the picture get darker or brighter.

With fluorescent backlighting and edge-lit LED backlighting, by contrast, the entire backlight dims or brightens at once, if at all.

Being able to dim specific quadrants helps reduce the amount of light that leaks through to darkened pixels, and the end result is blacks that appear darker and more realistic. Since black levels are crucial to contrast ratio, the deeper the blacks, the more the picture–and colors–appear to pop. Also, the image as a whole will seem crisper. A great example of local dimming done right is Samsung’s UNB8500 series, which is one of the best-performing TVs we’ve ever tested.

One downside to local dimming is an effect called “blooming,” where brighter areas bleed into darker ones and lighten adjacent black levels. …

Originally posted at Fully Equipped

Samsung's UNB8500 series costs a bundle.

(Credit:
Sarah Tew/CNET)

If you watch football or read CNET, chances are you’ve noticed ads for Samsung’s so-called LED TVs. The company has released three series of these super-thin LED-based LCDs so far this year, the 6000, 7000 and …

NICT's MSens technology: a practical use for 3D.

(Credit:
Scott Ard/CNET)

TOKYO–In the exhibition halls of a gadget trade show, the things that normally jump out are the wacky outfits the female booth attendants are forced to wear, the mammoth wall installations of TVs, and long lines for booth swag.

For better or worse, the enduring image of Ceatec 2009 has been the sight of suit-clad men waiting in twisting queues for the chance to don a pair of plastic 3D glasses for a five-minute TV demonstration. There are two reasons for that: because the major TV makers here couldn’t miss out on the chance to show their prototype models of this trendy technology, and because there wasn’t really much else going on this year.

There isn’t yet a final, official count, but this year’s show, which started Tuesday and runs through the weekend, so far seems far less crowded than in years past. Attendees could have been kept away by the sluggish economy, or the inclement weather, including a tropical storm that hit Tokyo midweek. Either way, the general vibe at the Makuhari Messe has been much more subdued.

In the past Ceatec has been known as the event where gadgets destined for store shelves showed up en masse, the last stop on the trade show circuit before they’re packaged and ready for consumers during the yearly holiday sales period. However, the 2009 edition was shorter on practical products and very low on new stuff.

As at IFA in Berlin last month and at the Consumer Electronics Show in Las Vegas in January, 3D was the dominant theme. Panasonic showed its very-close-to-being-ready 3D plasma TV here this week–this time, though, on a 50-inch set, a size that’s far more practical than the 103-inch behemoth used at expos earlier this year. The 50-inch model, plus some sizes larger than that, will be unveiled along with pricing and shipping information at CES in January 2010. Sony is also readying its first 3D TV for the home, which is set to ship sometime next year, though the company wasn’t specific about exactly when.

…

Originally posted at Circuit Breaker

(Credit:
Toshiba)

Ever heard of a super computer in an HDTV? Toshiba has released fresh juicy details on its Cell processor-powered LCD TV ahead of the Ceatec 2009 tech fair in Japan.

The Cell Regza 55X1 is an LED-backlit panel with local dimming that delivers class-leading 5 million:1 dynamic …