Static text and Rear-Projection TV

Sierra Nomad Photography wrote on 2/19/2010, 10:44 AM

Hi:

I'm (finally) wrapping my DVD up, and have some text I've included as "menus" that are actually intended to be read. However, the DVDA manual says "If you have a display device that is susceptible to burn-in (such as a rear-projection television), do not use static text or bright static graphics in any scene that will be displayed on screen for an extended period of time."

Hmm. What is an "extended period of time"? For example, would I be safe if I had the "menu" automatically go back to the previous, genuine menu after a minute? Viewers may not be done reading and decide to navigate back to it.

Comments

alk3997 wrote on 2/19/2010, 1:53 PM

Any device that uses Phosphors could have burn in. Those that do not use Phosphors won't have any issues.

As you pointed out CRTs have a problem with burn-in (visit a bowling alley with old displays and you'll get to see it). Newer plasmas are supposed to be relatively burn-in free, but I have not tested to see. Once an image is burned-in, it is there forever.

LCDs are burn-in free. They do, however, have an issue with "persistence". If the same image is left on an LCD for a long time (large number or hours or days), the image can stay on the LCD even after it turned off. However, by exercising the LCD (on/off combos for all of the pixels), the persistence goes away. It has to do with returning the crystals to their relaxed state. So, this isn't burn-in since it can be easily remedied in most cases (where-as burn-in is permanent).

LCOS (Sony and JVC) as well as DLP technologies don't have any issues with burn-in either. As far as I know OLED doesn't have a problem either.

If someone is worried about their titles causing burn-in, the easiest thing to do is to move them around the screen (or at least reduce the intensity of the titles).

Andy

Sierra Nomad Photography wrote on 2/19/2010, 4:57 PM

Thanks to both of you.

Yes, I'm going to create video out of them and pan/zoom a little. Then just have it replay.

Thanks again,

Jon

musicvid10 wrote on 2/19/2010, 6:04 PM

Drop your white levels a little, say 225.

musicvid10 wrote on 2/19/2010, 6:07 PM

Any device that uses Phosphors could have burn in. Those that do not use Phosphors won't have any issues.

That is simply not true. LCD monitor displays have some of the worst burn-in imagineable. Especially the Samsung OEMs.
The idiots who said screensavers are no longer needed are a bunch of well . . . idiots.

Sierra Nomad Photography wrote on 2/20/2010, 8:14 AM

Thanks musicvid, will do.

Wm wrote on 2/20/2010, 8:58 PM

LCOS *can* have burn in, although it is usually not permanent., but JVC in particular warns about static images.

Using lower levels (grey) for text helps avoid this problem.

William