General > General Technical Chat
Why do backlight LEDs burn out and go blue?
james_s:
--- Quote from: station240 on November 10, 2021, 11:14:39 pm ---Still you'd think engineers would know white LEDs are just blue ones with a phosphor layer added.
--- End quote ---
I'd assume most of them do. I had never in my life until this thread ever heard of the phosphor coming off of an LED. I've had cheap white LEDs phoshor fail such that it got really dim and gray but I've never seen it fall off. That seems like a serious design flaw, maybe class action lawsuit if it's a common problem. LED backlights should last *at least* 10 years of normal use in a TV.
IanB:
--- Quote from: james_s on November 11, 2021, 02:26:19 am ---I'd assume most of them do. I had never in my life until this thread ever heard of the phosphor coming off of an LED. I've had cheap white LEDs phoshor fail such that it got really dim and gray but I've never seen it fall off. That seems like a serious design flaw, maybe class action lawsuit if it's a common problem. LED backlights should last *at least* 10 years of normal use in a TV.
--- End quote ---
Right. Best Buy is full of stunning looking LG OLED TVs costing ~$1000. I'd be seriously pissed if the phosphor fell off the backlight LEDs.
james_s:
If they're OLED they don't have a backlight, perhaps you meant QLED? Those are just LCD, with a deliberately deceptive name clearly meant to confuse them with superior OLED displays.
IanB:
--- Quote from: james_s on November 11, 2021, 04:24:03 am ---If they're OLED they don't have a backlight, perhaps you meant QLED? Those are just LCD, with a deliberately deceptive name clearly meant to confuse them with superior OLED displays.
--- End quote ---
I didn't know that about OLED displays. If they don't have a backlight, that's good in a way, there is less to go wrong. But I suspect there is a downside. I'll have to research it.
bdunham7:
--- Quote from: IanB on November 11, 2021, 05:07:36 am --- But I suspect there is a downside.
--- End quote ---
Oh yes. Every OLED display in history (so far) has been a short-lived POS. TV screens are a newer application, but since LG did so well with their backlights, I can't wait to see the screen burn on the OLED models in a few years.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version