How to fix the touch screen in my iPhone?

I'm not sure what the "touch screen part" is called, but whenever I touch the whole right side of my iPhone (4s, 16g, white) my phone does not respond. Is there any way to fix this? I would really like to buy an inexpensive do-it-yourself kit off of amazon, but I'm not sure what to look for… I've seen lots or search results come up with "LCD", is this what I need?

Are you sure with DIY? Unless you know what you're doing, better leave it to professionals at the nearest Apple Authorized Service Provider.