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Also LCD TVs can burn in

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Old 08-24-2007, 12:16 AM   #1  
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Default Also LCD TVs can burn in

Despite the myth that only Plasma panels suffer from screen burn in, LCD panels also can burn in.

Also LCD TVs can burn in

Pictured is a 22 Japanese model Sharp LCD HDTV used for a computer software ad. The retained images appear at the top-right as Japanese text and on the bottom-right as the price in yen (the 0 is clearly burned-in)
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Old 08-24-2007, 12:30 AM   #2  
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nmm
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Old 08-24-2007, 12:39 AM   #3  
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Not really burn-in then, but a similar phenomenon, and a reversible one apparently.
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Old 08-24-2007, 05:55 AM   #4  
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Burn-in is permanent (hence the use of the word BURN). I have an old pc CRT that is burned, and there's absolutely no way to fix it.

In LCDs, there are sometimes stuck pixels, but
these pixels can be "unstuck" with continued usage.
It's not a permanent burn... just a temporary problem.

Last edited by electrictroy; 08-24-2007 at 06:05 AM..
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Old 08-24-2007, 06:03 AM   #5  
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i have seen similar stuff at CC, with burn in of DVD menu on one of LCD set by Magnavox, most LCD sets do suggest not to use 4:3 on Tv for long period of time,
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Old 08-24-2007, 09:38 AM   #6  
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On LCD's, it's nor burn-in, rather image retention.

Each pixel of an LCD is a capacitor (one of the reasons LCD's have a slower response time than other technologies). If the same image is left on the screen for a long enough period of time, charge builds up on the individual capacitors (pixels) which doesn't get completely discharged, causing image retention.

If the display is left unpowered long enough for the charge to dissipate, the image retention will go away. How long that takes depends on how much charge is built up and the capacitive properties of the given panel, which varies from manufacturer to manufacturer.
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Old 08-24-2007, 09:59 AM   #7  
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Remember the Demon Dialer? It had no battery, but relied on a capacitor to keep it's memory alive when power was disconnected. It was so well engineered that the up to 700 names and numbers could be retained for over a week with no power applied. AND there was an occasion when by mistake I disconnected power to it, realizing it about 8 days later. Plugged it in and didn't lose one stored number!

BTW, that was something like 20+ years ago.
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Old 08-24-2007, 11:01 AM   #8  
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Quote:
Originally Posted by BobY View Post
If the same image is left on the screen for a long enough period of time, charge builds up on the individual capacitors (pixels) which doesn't get completely discharged, causing image retention.

If the display is left unpowered long enough for the charge to dissipate, the image retention will go away.
EXCELLENT post! Thanks. I just learned something new today.
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Old 08-25-2007, 02:01 AM   #9  
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Quote:
Originally Posted by paulc View Post
Remember the Demon Dialer? It had no battery, but relied on a capacitor to keep it's memory alive when power was disconnected. It was so well engineered that the up to 700 names and numbers could be retained for over a week with no power applied. AND there was an occasion when by mistake I disconnected power to it, realizing it about 8 days later. Plugged it in and didn't lose one stored number!

BTW, that was something like 20+ years ago.
heh heh,,not much different than a capacitor from a automobile distributor. Grab one by the wrong end and boom - instant viagra!! But kids these days don't know that. It helps to keep the grandchilds at bay.
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