Latest in Automatic contrast control

Image credit:

Panasonic cops to rising black levels in its plasma HDTVs, but questions still remain

Richard Lawler, @Rjcc
February 4, 2010
Share
Tweet
Share

Sponsored Links

Over the last several months complaints that Panasonic's plasma HDTVs experience sudden adverse changes in their black levels after a certain number of viewing hours have been piling up in an AVSForum thread, and now that behavior has been confirmed, though not very well explained, in a response the company sent to CNET today:
In order to achieve the optimal picture performance throughout the life of the set, Panasonic Viera plasma HDTVs incorporate an automatic control which adjusts an internal driving voltage at predetermined intervals of operational hours. As a result of this automatic voltage adjustment, background brightness will increase from its initial value ... The newest Viera plasma HDTVs incorporate an improved automatic control which applies the voltage adjustments in smaller increments. This results in a more gradual change in the Black Level over time.
Especially considering many buyers purchased their televisions specifically for those deep black levels, you can see why a TV suddenly going Sammy Sosa overnight would be upsetting. One of the reigning theories in the thread indicated by poster & calibrator D-Nice has been that this is by design, but a flaw in the settings caused the large jumps (around double the brightness, as measured by several owners light meters) instead of a much more subtle change. So what now for owners or potential buyers? Without more details about what is going on and whether or not anything can be done about it, like CNET's David Katzmeier, it's hard to see how we can continue to recommend these HDTVs for purchase without knowing what they will do months or years down the line. The ball is in Panasonic's court now, a speedy response could do a lot to assuage the concerns of current and potential owners.

[Thanks to everyone who sent this in]




All products recommended by Engadget are selected by our editorial team, independent of our parent company. Some of our stories include affiliate links. If you buy something through one of these links, we may earn an affiliate commission.
Share
Tweet
Share

Popular on Engadget

PlayStation is the latest to join the Facebook ad boycott

PlayStation is the latest to join the Facebook ad boycott

View
100 million people watch YouTube on TVs each month

100 million people watch YouTube on TVs each month

View
'NBA 2K21' comes with a next-gen upgrade... if you spend $100

'NBA 2K21' comes with a next-gen upgrade... if you spend $100

View
Samsung is selling a wireless charger that also sterilizes your phone

Samsung is selling a wireless charger that also sterilizes your phone

View
Will gallium nitride electronics change the world?

Will gallium nitride electronics change the world?

View

From around the web

Page 1Page 1ear iconeye iconFill 23text filevr