120hz

Samsung LED-free LCD a solid value

TV makers are pushing LED-based LCD TVs hard, in part because the newfangled backlight scheme allows thinner, more aggressive designs and slightly better energy efficiency. However, a larger part, we suspect, has to do with profit margins: TVs with LED backlights generally cost more than those with standard fluorescent, or CCFL, backlights. Samsung sells numerous so-called LED TVs, but the LNC630 series isn't one of them.

This midrange LCD uses the standard backlight, doesn't cost a fortune, yet manages in some ways--chiefly screen uniformity--to produce a better image than the company's edge-lit LED models. It also competes … Read more

Thin Samsung TV fat with features, Hulu Plus

Samsung's ultra-thin edge-lit LED-based LCD TVs created quite a stir last year, and in 2010 numerous other makers have followed the Korean giant's lead with inch-or-so-thick panels of their own. Samsung's are generally still the thinnest, however, and on models like the UNC6500 series the company manages to pack more features and extras--the latest being Hulu Plus--into its TVs than just about anyone else. In terms of picture quality, as expected, the UNC6500 doesn't offer a significant improvement over standard LCDs, but it is mighty efficient as well as oh-so-sleek, which might be enough to justify … Read more

LG's edge-lit local dimming LED goes astray

In the last few years, the most-compelling LCD challengers to the picture quality reign of plasma were equipped with multizone LED backlights that could dim or brighten in different areas of the screen independently. Broadly known as local-dimming technology, in the best cases it delivered superb black-level performance and manageable tradeoffs in the form of stray illumination or "blooming." In the worse cases, such as the LG LE5500 series, that stray illumination is not managed well.

Unfortunately, we suspect that many buyers lured by the LG's claims of dimming won't understand the differences--among them the fact … Read more

Debunked: 'Infinite' contrast ratio, 240Hz, and Sharp's yellow pixel

The cutthroat competition among HDTV-makers inspires constant efforts to one-up the other guy, and the end result are confusing, misleading claims that do little to tell shoppers about true performance and picture quality. At CNET I try to cut through a lot of that "specmanship" in my reviews, and many other critical voices are fighting the good fight too.

"Display Myths Shattered: How Monitor & HDTV Companies Cook Their Specs" collects numerous misleading HDTV and PC monitor specs and debunks them one by one. The author, Raymond Soneira, takes aim at unnecessary--and often harmful to picture … Read more

Sony Eco TV turns off when you leave the room

In case you haven't noticed, "green" is big business. One way for HDTV makers to cash in on the public's craving for efficiency is to label a TV "eco-friendly." Sony's KDL-VE5 series does just that, but unlike a lot of so-called green electronics, this TV can actually save power in a new, potentially very effective way. That's because it incorporates a "presence sensor" that can automatically turn the picture off when it detects nobody's watching.

Amazingly, the feature worked pretty well in our tests, and we hope to see … Read more

Test pattern exposes more issues with dejudder processing, but does it matter?

We've often complained about the video-like look of dejudder processing circuits like Samsung's Auto Motion Plus (AMP), Sony's MotionFlow, and LG's TruMotion found on those and other companies' 120Hz and 240Hz equipped LCDs. Using a process called Motion Estimation/Motion Compensation (ME/MC), they remove some or all of the judder from 24-frame, film-based sources, producing a look some viewers prefer. For the record, we strongly prefer to leave these modes turned off.

But in addition to that videolike smoothing effect, the processing also causes further image degradation. We've documented numerous such instances, which often appear as halos, trails and other unnatural effects clearly visible in program material, especially during medium to fast movement, such as an actor turning his head quickly during a closeup.

Now a post at HDguru.com by reviewer and industry observer Gary Merson exposes additional artifacts caused by the processing. The artifacts are visible in a video of five LCD TV makers' dejudder-equipped LCD TVs (a sixth plasma TV's wedge lacks the flashing and much of the moire). They appear as unnatural flashes and tears in addition to extensive moire that looks like confused, curving lines. The test pattern in the video originated from a Blu-ray test disc by Spears and Munsil, a copy of which is included with the Oppo BD-P83.

Using a few of the 120Hz and 240Hz HDTVs I have in my lab at the moment, namely the the Samsung UN46B7000 and LN52B750, the Sony KDL-46VE5 and KDL-52XBR9, and LG 47LH50 and 47LH90, I was able to confirm the Guru's results using the Spears and Munsil disc played via a PS3 at 1080p/24. The flashing artifacts were indeed visible with the dejudder circuits turned on, and disappeared when they were turned off (the flashes and extra moire can appear subtle in the video, but in person the difference is much more obvious).… Read more

Refresh rate, motion blur a nonissue on modern LCDs?

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. … Read more

Sony's cheapest streaming-video TV reviewed

This year most major TV makers are using interactive features to distinguish themselves from the others, and unlike differences in black level performance and off-angle viewing, it's easy for shoppers to tell the various interactive add-ons apart. Whether they actually want said add-ons is another question.

Sony's KDL-W5100 series represents the company's most affordable attempt at interactive TV, although it still costs a few hundred more than the entry-level Internet-ready sets from its competitors. Sony does offer a lot of extras, however, including select Yahoo widgets, scads of streaming Web video (much of it pretty niche), Amazon … Read more

LG LCD TV delivers box-free Netflix, YouTube, Yahoo widgets

If the Internet is the future of television, then LG's LH50 series hails from the day after tomorrow. This flat-panel LCD is the first to offer Netflix streaming, which allows instant, free-to-subscribers access to an all-you-can watch menu of thousands of movies and TV shows without having to connect another box. Sure, Sony has already announced the service for its own compatible TVs later this fall, and we expect Netflix to make its way to Yahoo widget-equipped TVs from Samsung (and perhaps others) sometime later this year, but for now the LH50 holds exclusive claim to Netflix. Speaking of … Read more