Marco Arment provides a tool that shows a checkerboard image for a few minutes, then switches to a solid gray.
If you still see the squares from the first image in the solid gray wallpaper, then that means there is an image retention issue.
You likely won't notice it in actual usage nor will it cause any real problems, but if you absolutely need to know whether your batch was screwed over by Sharp, in case you want to return or exchange your rMini for another batch, this is the way to do it.
Direct link to the checkerboard page
Explanation for the checkerboard page
If you still see the squares from the first image in the solid gray wallpaper, then that means there is an image retention issue.
You likely won't notice it in actual usage nor will it cause any real problems, but if you absolutely need to know whether your batch was screwed over by Sharp, in case you want to return or exchange your rMini for another batch, this is the way to do it.
Direct link to the checkerboard page
Explanation for the checkerboard page
