[nahtanoj]

I own a samsung 40" 768p TV (I forgot the model #) and there is a hard to miss light retention event that happens every time the content switches from 4:3 to 16:9. It's not burn in or image retention since I think that defies the physics of LCDs. I think it's a delay of the backlight reacting, but I don't really know.


Is this normal? I can just ignore it if it's a factor of all LCDs, but I'd like to know, before I buy a second set for another room.


Thanks!

 

[Nmlobo]

I own an LCD and I've never noticed any "light retention" when my set switches modes.

 

[DBLASS]

There "can" be a photo retention within an LCD but it is only "sorta" related to the backlight. If the thin-film transistor within the LCD are hit with too much light (from the backlight), there is a phenomena called Photo-conductivity. This is when the light (photons) can charge the transistors whether or not there is an active signal applied to them. This charge can "stick" the image for a while (usually 1-3 seconds), while the transistor changes its charge.


Photo-conductivity usually only happens when excessive light is shoved into the cell (20K+). Because the displays have low transmissivity (3.8 %- yes only 3.8% of the backlight makes it out the front) if the display is 500 nits, 500 nits is 3.8% of what number? It gets very close to the point where the display can photo conduct.


Is this what your seeing??? Can't say. But the above is a very real phenomena.


DB

 

[Boke01]

I thought my LCD had this problem. Turns out it was just the noise reduction feature.

Have you tried turning yours off?