The Uniformity Tape keeps the edge of the display closest to the LEDs uniform in brightness when the spacing of light sources is increased.

ENGADGET: 3M Uniformity Tape improves lighting quality on LED edge-lit LCDs, lowers production costs

Just buy an iPhone case, or get a bit of duct tape and cover a gap on the strip of metal that runs along the outside edge of the phone, which also serves as an antenna, Gikas writes.

FORBES: Consumer Reports Won��t Recommend New iPhone

Uniformity Tape can also increase LED spacing by up to three times the current spacing, while maintaining edge uniformity for a given bezel size.

ENGADGET: 3M Uniformity Tape improves lighting quality on LED edge-lit LCDs, lowers production costs