Many set - top boxes — like NVIDIA SHIELD, Amazon Fire TV, and Apple TV for example — also have their own overscan settings. (howtogeek.com)
If you can't get it to fit perfectly, you may also need to disable overscan on your Blu - ray player or set - top box. (howtogeek.com)
A widescreen television might be used to approximate the presumable theatrical ratio by zooming in on the picture with the television to matte the picture and zooming out with the DVD player to compensate for overscan. (dvdizzy.com)