I'll see that with captures using the tuner card and playing them back with WMP 11in particular. The boundries are seen on the sides due to the aspect ratio the recording application uses for the NTSC standard. When burned to disk I won't see it there just when reviewing captures stored on the drive.
With an lcd tv being used for the monitor the aspect ratios and screen resolutions will be different from pc to comply with television standards. There you are crossing over from one set of standards to another.
Fortunately one site covers quite a bit on how to connect pc to tv for viewing movies and other videos there. AbroadTV, Inc. Connecting your PC to the TV
I use a 19" widescreen lcd pc monitor where some programs may see the option for changing the aspect ratio from the non widescreen format for viewing full screen without borders or gaps appearing.