Samsung makes Ipad parts but can't compete?

So I'm reading the nexus 7 review, and I like it. I just broke my ipad screen recently and if I repair it myself it could cost my $100. If I take it to apple it could cost $200 to replace( which just so happens to be the price of the nexus). This got me thinking about the how is it Apple is able to bid on the these samsung parts, and we have yet to see another competitor use the same device. Let me be clear Apple doesn't own the company that makes the retina display for phone, or for tablets. I can't see how another company cannot bid for the same product.

From what i understand in the OEM parts supply business it doesn't usually work this way. Let me give an example. In 2003 Delphi industries created a new shock systems for passenger automobiles called MangeRide. Delphi used to be owned by GM, and still has a close relationship with them, so the first cars to use the Tech was corvette. I don't want to go to far into the details of the system, but suffice to say the shocks abilities are just as above the competition at the time as the the retina display was in 2008. So it debuted on the corvette and was later adopted by Ferrari, BMW, Audi, and other manufactures. Why has this not happened with the Samsung retina displays?

The only thing I can conclude is that there is something going on with the bidding system in Korea. it just doesn't make any sense to me that any other manufacturer doesn't try to compete in this arena.