How long do LED and/or LCD TVs last?
Keith
How old is your LED/LCD TV; and, does it still work as it did when you first bought it?
Keith
Meat Plow
The technology is only a couple years old.
--
Live Fast, Die Young and Leave a Pretty Corpse
Jeff Liebermann
Most LED backlit TV manufacturers are claiming 100,000 hr lifetime.
<http://www.mimaki-ls.com/Pdf/appnote/AN-103%20LED%20Light%20Lifetime.pdf>
If you watch 8 hrs of TV per day, that's 12,500 days, or 34.2 years.
However, that rating is the time to where the brightness deteriorates
to *HALF* the original brightness. Methinks you will probably find it
irritating well before that point. At a 30% drop, my guess(tm) is
about 20,000 hrs or 6.8 years maximum before the wife and kids start
to complain.
The various color LED's deteriorate at different rates. In order for
LED illumination to work, the TV needs to have the combined color
balance continuously (dynamically) set to white, and will therefore
automagically compensate for any color drift due to aging. You will
probably notice some inconsistency in the background white level as
individual LED's age at different rates (heavily dependent on
temperature distribution).
It's far too soon to tell if the crystal ball gazers and number
jugglers are accurate for LED TV's. For practical purposes, assume
that the TV will last 1 day longer than the warranty period, that
overall quality will deteriorate as prices drop, and that repair parts
will be unobtainable when it finally fails.
--
Jeff Liebermann je...@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Jim Yanik
news:ivigc61ckvo7972m1...@4ax.com:
> On Wed, 27 Oct 2010 13:04:00 +0000 (UTC), Keith
><keithd...@gmail.com> wrote:
>
>>All:
>> How old is your LED/LCD TV; and, does it still work as it did when
>> you first bought it?
>>Keith
>
> Most LED backlit TV manufacturers are claiming 100,000 hr lifetime.
><http://www.mimaki-ls.com/Pdf/appnote/AN-103%20LED%20Light%20Lifetime.pd
>f>
> If you watch 8 hrs of TV per day, that's 12,500 days, or 34.2 years.
> However, that rating is the time to where the brightness deteriorates
> to *HALF* the original brightness. Methinks you will probably find it
> irritating well before that point. At a 30% drop, my guess(tm) is
> about 20,000 hrs or 6.8 years maximum before the wife and kids start
> to complain.
>
> The various color LED's deteriorate at different rates. In order for
> LED illumination to work, the TV needs to have the combined color
> balance continuously (dynamically) set to white, and will therefore
> automagically compensate for any color drift due to aging. You will
> probably notice some inconsistency in the background white level as
> individual LED's age at different rates (heavily dependent on
> temperature distribution).
how does a TV "dynamically" set it's white balance?
>
> It's far too soon to tell if the crystal ball gazers and number
> jugglers are accurate for LED TV's. For practical purposes, assume
> that the TV will last 1 day longer than the warranty period, that
> overall quality will deteriorate as prices drop, and that repair parts
> will be unobtainable when it finally fails.
>
>
>
LCD TVs are the ones that won't last long;
the ones with fluorescent backlights using HV drivers.
--
Jim Yanik
jyanik
at
localnet
dot com
Jeff Liebermann
wrote:
More:
"How Long do LCD TVs Last?"
<http://lcdtvbuyingguide.com/lcdtv/lcdtv-lifetime.shtml>
"LED TV Technology Pros and Cons"
<http://www.lcdtvbuyingguide.com/led-tv/led-tv-pro-con.html>
>> The various color LED's deteriorate at different rates. In order for
>> LED illumination to work, the TV needs to have the combined color
>> balance continuously (dynamically) set to white, and will therefore
>> automagically compensate for any color drift due to aging. You will
>> probably notice some inconsistency in the background white level as
>> individual LED's age at different rates (heavily dependent on
>> temperature distribution).
>
>how does a TV "dynamically" set it's white balance?
I was told that with edge lit LED TV's, there are some photo
transistors scattered around the edge of the LCD along with the LED's.
Turn on each color in sequence, measure the light output, and adjust
the LED power to some desired reference. What I don't know is whether
the algorithm involves increasing the current to the low output LED,
which may cause a rather short lifetime, or whether it reduces the
current to all the other LED's, which will cause overall reduced white
output. I think the method is similar with back illuminated LED's
(local dimming), but I don't have any details. I presume that there
are patents on the topic, but I don't want to go digging right now.
OLED (organic LED) panels are the ones that worry me. They are known
to have a short lifetime (15,000 hrs to half brightness).
"LED TV Local Dimming Backlighting vs. LED TV Edge lit Backlighting;
Which is Better?"
<http://www.led-tvbuyingguide.com/ledtv/edge-light-vs-local-dimming.html>
>LCD TVs are the ones that won't last long;
>the ones with fluorescent backlights using HV drivers.
I see plenty of those panels in laptops using CCFL (cold cathode
fluorescent) tubes. Some brands die early, but most of what I've seen
lasts longer than the rest of the laptop. Unfortunately, perception
is everything, and the expected lifetime of a laptop is probably about
8 years. My guess(tm) is that the expected lifetime of the TV is much
longer. What I usually see in both laptops and TV's is a blown
backlighting HV inverter circuit or board. The CCFL tubes don't seem
to be a problem.
However, I wouldn't worry much about failure rate. LCD will be
obsolete once we get 3D projection TV as in Star Trek Holodeck.
Clyde
I thought the LED in LED tv was referring to the backlight method,
rather that the actual screen itself. Maybe I'm not clued up.