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Why do backlight LEDs burn out and go blue?
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PlainName:

--- Quote from: james_s on November 13, 2021, 04:03:03 am ---
--- Quote from: dunkemhigh on November 12, 2021, 11:37:30 pm ---That's got me puzzled. What is the 'traditional sense' for a TV? Are they used instead of, for instance, a radio (I note Freeview over here has a lot of 'FM' channels).

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Loads of people just have the TV on for many hours of the day tuned to whatever happens to be on, whether it is being actively watched or not. My dad was like that, he'd have his TV on from the time he got home from work to the time he went to bed, and on the weekends it was on from the time he got up, he liked having it as background I guess.

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OK! Kind of wallpaper.

Got to admit I have a small 7" monitor hooked up to STB output which is on whenever my PC is. Reason is that when I was developing a CCTV DVR I needed a video source other than the DVD players being already used, and 24-hour news channel hit the spot. I just got used to it being there as a kind of ticker tape, keeping up with the world.
Cerebus:

--- Quote from: amyk on November 13, 2021, 04:08:59 am ---Driving the worn ones harder to get the same light output just means they'll wear out even faster, so it's a very temporary solution and once the degradation starts it will quickly accelerate.

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Are you making assumptions from what you know about the wear characteristics of 'conventional' LEDs and applying them to organic LEDs? Straight question, because if you are then there's every possibility that those assumptions are wrong (they could also be right). One type are made out of elements, one out of compounds, they may wear/age in very different ways. I just don't know because I haven't looked into OLEDs in any more systematic a fashion than reading the odd article in the trade press as they started to emerge. So I'm not saying you're right or wrong, just asking "Is this an assumption or actual knowledge"?


--- Quote from: amyk on November 13, 2021, 04:08:59 am ---...and 30 years? They claimed the same 50-100k hours for LED lamps when they first came out... but look at what the actual lifespan in practice is ::)

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I have an unpleasant suspicion that the shorted life is down to value engineering and "Design it so they need to come back and buy more."
james_s:

--- Quote from: Cerebus on November 13, 2021, 02:34:58 pm ---I have an unpleasant suspicion that the shorted life is down to value engineering and "Design it so they need to come back and buy more."

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Unfortunately a lot of TV manufactures have miscalculated and gone too far. The number of late model LED lit LCD TVs I have been given with bad backlights makes me very hesitant to ever recommend buying one of those brands. I come from an era when a TV was expected to last around 20 years and I still expect that. Anything less than 10 years is absolutely unacceptable.
Cerebus:

--- Quote from: james_s on November 13, 2021, 06:53:03 pm ---
--- Quote from: Cerebus on November 13, 2021, 02:34:58 pm ---I have an unpleasant suspicion that the shorted life is down to value engineering and "Design it so they need to come back and buy more."

--- End quote ---

Unfortunately a lot of TV manufactures have miscalculated and gone too far. The number of late model LED lit LCD TVs I have been given with bad backlights makes me very hesitant to ever recommend buying one of those brands. I come from an era when a TV was expected to last around 20 years and I still expect that. Anything less than 10 years is absolutely unacceptable.

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We were talking of LED lamps, and that's where I suspect perhaps a little less good faith from their manufacturers towards the public than is properly warranted. One would hope that TV/panel manufacturers cared a bit more for their reputation. After all, you will remember whose TV brand you bought, the brand of that £4 LED lamp that lasted a disappointing time? Probably not.
james_s:

--- Quote from: Cerebus on November 13, 2021, 08:12:02 pm ---We were talking of LED lamps, and that's where I suspect perhaps a little less good faith from their manufacturers towards the public than is properly warranted. One would hope that TV/panel manufacturers cared a bit more for their reputation. After all, you will remember whose TV brand you bought, the brand of that £4 LED lamp that lasted a disappointing time? Probably not.

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The oldest LED bulbs I have are ones that cost me around $40 each back when I bought them. At the prices they were charging back then I think most of the bulbs were over-engineered because they knew a lot of early failures would risk killing the entire market, a lot of people already didn't trust them after experiences with CFLs not lasting as long as claimed. Then there was the predictable race to the bottom, although you can still get reasonably good ones. I've had good luck with Cree and Philips bulbs. 
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