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Line, faults & possible causes to LCD screen are given with illustrations.
These won't be available from anyone but HP. Call them at 1-800-HP-INVENT and ask if you can have it repaired or exchanged. Your only option may be their trade-in trade-up program where basically you get a really good deal on a refurbished printer in exchange for yours. The refurbished printers are in factory condition with full warranty, and often have a greatly reduced extended warranty plan option (always a good investment with these guys).
That is a burnt LCD panel caused by excessive heat from the lamp, maybe due to blocked/restricted airways. It is not likely to get any better and a new LCD unit will be required to repair it along with new filters and maybe a fan.
My parents have the same issue with their Sony KDL-46V4100 TV and were told by the tech that the LCD screen was physically broken and would have to be replaced. The replacement of the screen would cost more than a brand new TV and the TV is not longer under warranty. After the TV is on for awhile the Black cloud goes away but it always comes back when they turn the TV off/on. It stays for 20 - 30 minutes sometimes. The Tech took both top corners of the TV and pushed one back and pulled one forward to show them he could recreate the problem after the black blob cleared up. By twisting the corners he made the blob reapper which he claimed was becuase of the damaged screen. I have no idea how the screen was damaged? I helped them take it out fo the box and set it up. We never dropped it bumped it once? It's never falled off the stand so go figure? It would be nice to find more people with this issue and get a recall going. Something that expensive should last longer than to two years.
It's not the lamp. It maybe dirt or dust or even a bug. The picture that is projected starts out 1/2 inch by 1 inch in size. Somewhere along the path to the screen a piece of dust gets in and after it's projected it looks like a blob on the screen. The closer it is to the DLP chip itself the bigger it looks. If this is the case you should have a professional service it. The Light engine needs to be removed and cleaned. If you lightly push on the screen does the blob move slightly ? If it does it's not on the screen it's in the optics or the mirror. You may also have a bug or smug on the main mirror that causes the same thing. This will appear about 2 times the normal size of the object. If your up to removing the screen Take a look closely at the mirror on the back of the set. You can clean this with windex it's glass. If you do take the screen off hold it up to the light. Sometimes spiders make webs and leave marks. Good Luck