That's very odd. O.o I used to play on a 17" TV and I never had this problem.
Forgive me for asking, but; do you have multiple characters? and is it like this with all of them?
Yes, it is like this for all my characters, I have died to many times to count because I can't see my health bar. I don't know if you played MW2 but they have a setting where you can adjust the margins of the screen, I think it would help if they did something like that. And I don't have any settings on my tv that help, trust me i tried for hours to fix this.