Some companies (Samsung, LG.Philips) manufacture panels, but also sell the finished product (i.e. TV or monitor, which is not only the panel but includes the electronics in the back, the cover, etc.) under their own name brand. Other companies (i.e. AU Optronics) are exclusively OEM manufacturers who make panels to sell to other companies, but do not sell the end product themselves. Hence AU Optronics is the 3rd largest panel manufacturer in the world but no one's seen an AUO monitor yet (although they are affiliated with BenQ).
You can think of this in terms of business units. There's a Samsung panel-making unit, and a Samsung TV/monitor selling unit. The TV/monitor selling unit will *usually* buy from the same company's panel-making unit (for obvious reasons), but there are also reasons to buy from other manufacturers to use in your own brand-name TV/monitors, such as:
* Inadequate supply: company has a large portion of the brand-name market, but not enough factories to support their market share; thus buy panels from other manufacturers to fill the demand.
* Quality gradient: While most companies have top-of-the-line products, a large portion of the money is made on standard or entry-level models, since most people don't really need that 2 ms 10-bit color 180 degree viewing angle monitor that costs $xxxx. Thus while companies hype their top-of-the-line products, the money's made on the brand name that they put on the standard models which are from other panel manufacturers -- although quality may be somewhat less, people see the brand name and think "well they got good products so this should be good as well".
* Different technologies. Somewhat similar to the above, but having a range of different technologies will satisfy more users than concentrating on one type of technology.
Large brand-name companies like Samsung and LG.Philips will actually buy from several panel manufacturers. This actually becomes a very interesting business strategy for both parties because the buyer is supporting his competitor by buying his panels; yet the seller knows that once the buyer has adequate panel-making supply of his own, he may stop buying, and the seller will have to find his own means of selling the panels (i.e. have enough brand name or other buyers). In essence, the buyer is helping his competitor make enough money off of the panels (and thus become a bigger company), but the seller is helping his competitor gain market share, so it becomes an interesting game between the different manufacturers.
Regarding the DVI thing, Europe considers DVI to be TV-capable so they charge an extra TV import tax on anything with DVI; I don't know if HDMI or whatever other technologies count, but this is why many manufacturers will have a non-DVI version for Europe and a DVI-capable version for everywhere else. So much for free trade huh.
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