Why does the contrast ratio drop to partly after going on for 30,000 viewing hours on a plasma tv?
Answers:
It's questionable, and newer sets last longer. Contrast ratio is the difference between the brightest and darkest content the eyeshade can display. When the maximum brightness decreases that variety gets smaller.
That is the life span span on the gas inside the television.
in good health its because you use up alot of the plasmas gas inside so as the gas decreases the ratoi gos down because it have les to work with I just love the misinformation that exist out in that about TVs. It cracks me up!
Plasma TVs do not seep nor use up their plasma gas. All light sources corrosion with age & this applies to the PHOSPHOR which is the visibile restrained source for a plasma TV. The flouresence tubes in an LCD TV also putrefaction with age. The "half-life" is the average time that it take for a light source to lose partly of its lumminance. For today's plasma or LCD TVs that is around 60,000 usable hours. There is no real difference today between the half-life of a plasma or LCD TV.
Note: The current 1080p plasma TVs from Panasonic are in actuality half-life rated at 100,000 hours. That's over 30 years of use for the average household.
There is a difference within the affects this decay have on the two type of TVs. Yes, a plasma TV will darken with age, but it will retain its color exactness. An LCD TV darkens next to age also, but because of the way an LCD TV derives its color, an LCD TV will also lose its color meticulousness. LCD TVs often times will require color recalibrations as they age; plasma does not.