Panasonic is known for its plasma HDTVs. However, a lot of customers are starting to complain that the TVs are loosing their contrast over an extended period of time. CNET asked Panasonic about these problems and received this reply:

Panasonic Viera plasma HDTVs deliver exceptional picture performance throughout the lifetime of these products. Various elements and material characteristics of all electronic displays change with use over time. 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. After several years of typical use, the internal material characteristics will stabilize and no additional automatic voltage adjustments are required. The Black Level at this stabilized point will yield excellent picture performance.

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.

The company did state that newer plasma HDTVs will not have the problems that current models are having and instead have a more gradual low of contrast. However, ultimately the loss of contrast and picture quality is inevitable.

[via CNET]

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