Why Light seems to Reflect from Phone's Corner in Samsung Galaxy Note8?

The Light can Spread or Reflect along around the Galaxy Note 8’s window glass when using device in a dark place. This is not the light leaking out from the device inside. A similar phenomenon can also be seen on the previous devices due to its similar concept where it uses a window glass. 

However, it never affects to device performance or features and all Samsung smartphones is always being controlled under high level of quality standards internally.