LCD pixel defect - off topic

It's off-topic based on size and intended use, but not technology. Thought it might have some correlation to larger desktop LCDs. A new LCD TV acquired last night, has two irregular vertical glowing lines in it, purple or green depending on background color. Even visible with dark screen with power on. A web search turned up nothing, it's being returned for exchange, but am curious if this is pixel damage of some type? Never heard of this with LCDs used with computers or on notebooks.