glenn_cummings1 Posted July 22, 2008 Share Posted July 22, 2008 This may sound strange, however, has anyone ever noticed what appears to be a burn mark or something that looks similar in thier LCD Panel on top of the camera? My LCD panel (top of my 40D) has what appears to be a burn spot inside the panel off to the left. I'm sure it's nothing to worry about, but for a brand new camera it bothers me. Link to comment Share on other sites More sharing options...
bobatkins Posted July 22, 2008 Share Posted July 22, 2008 LCDs can change color depending on the angle of the light and if they are slightly stressed. I'm guessing that's what you are seeing. I've seen similar things on EOS top panel LCD screens. Link to comment Share on other sites More sharing options...
jason_hall5 Posted July 22, 2008 Share Posted July 22, 2008 If what you are see is what I think it is, It maybe the lens over the screen. I see something like that at certain angles. Can you take a picture of it? Jason Link to comment Share on other sites More sharing options...
mwtphoto Posted July 22, 2008 Share Posted July 22, 2008 when i am wearing my sunglasses the top lcd panel looks to have a dark spot in the corner. i think Bob and Jason are on the right track. Link to comment Share on other sites More sharing options...
sarah_fox Posted July 22, 2008 Share Posted July 22, 2008 LCD panels work via polarization of light. If you're wearing polarized sunglasses, you may see variations in the panel. Tilt your head to the side, and you'll likely see the screen go black. Any stresses in the panel materials can result in variations in polarization angle and can therefore result in variations in lightness/darkness of the panel. I fact the easiest method for detecting stresses in transparent materials is via cross polarized light. Link to comment Share on other sites More sharing options...
bobatkins Posted July 22, 2008 Share Posted July 22, 2008 I've seen the effect without polarizing sunglasses. I don't think it's due to stress birefringence, which is the phenomenon which gives rise to the polarization effect. If you take any LCD and apply pressure to it you'll probably see it darken. I know the screen on my HP calculator does. On cameras the LCD is behind a failrly thick screen, so applying pressure externally doesn't do much. Link to comment Share on other sites More sharing options...
wgpinc Posted July 22, 2008 Share Posted July 22, 2008 I see it occasionally on my 40D on the left side. I worried about it at first but I noticed that it went away so I am not that concerned about it. Just keep using it to take pictures. Good luck! Link to comment Share on other sites More sharing options...
sarah_fox Posted July 23, 2008 Share Posted July 23, 2008 Hi Bob, I'm no expert in birefringence effects, but I do know that any darkening of any area of an LCD would be due to polarity effects. My guess is that light enters through the polarization film, and the polarized light gets twisted, scrambled, and/or repolarized (insert correct term here) to some degree. Thus some of the light is no longer polarized in alignment with the front film. Then when it reflects off of the back and re-enters the film, it is blocked, hence the darkening. Link to comment Share on other sites More sharing options...
bill_haag Posted May 4, 2009 Share Posted May 4, 2009 <p>I see the same thing in the upper left corner of top mounted LCD info panel. Doesn't appear to be "growing" in size. Wonder if this is a quality issue ?</p> Link to comment Share on other sites More sharing options...
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