It seems that an unusually high amount of Galaxy Tab 10.1vs are experiencing screen bleeding. Screen bleeding is light that seeps through the sides of the LCD screen. Don’t know if yours suffers from it? There is an easy way to test it.
First download this black image. Then go into a dark room and turn the brightness on your Tab all the way up. If your screen is not black (see the picture above), then you are suffering from screen bleeding.
There is no way to fix screen bleeding, so contact Samsung or Vodafone for a replacement as soon as possible.