Rrings.com posted a very interesting article, in which they detail the results of their ongoing TV longevity test, in which they test 102 TVs to see which one lasts the longest. The test has been going on for three years. In general - most TVs were fine for the first 10,000 of use, but 20 TVs died during the test and 24 suffered from some sort of damage.
The most interesting takeaway is that OLED TVs actually suffered from less failures than LCDs. Most people assume that the lower lifetime of the organic materials (compared to the in-organic LEDs and LCs used in LCDs) means that the TVs are less reliable. But OLED burn-in has been consistently shown to be mostly a non-issue for most consumers, and the LED backlighting has a much higher chance of failure.
Generally speaking, it makes sense that the simpler architecture of an OLED TVs is of more importance than the material lifetime. LCD TVs have many layers and components, and thus more chances of failure. The component that was most prune to failure was the light guide path in edge-lit LCDs. One could assume, though, that this is a component that can be replaced in an LCD TV (when OLED panels degrade, one would have to replace the entire panel).
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