High contrast, quality screen can bring out details and imperfections more than a cheap matte white material. With that said, you should troubleshoot to see why you have these columns. For me using LCD VPL-CX1 (Sony XGA 4:3) it was wrong refresh rate on my HTPC. You should try differing sources and see if the artifacts are still there. Cabling may also be a culprit. www.thebigdvdpicture.com has Sony forum which may be helpful.
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Huey ;-]
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Huey ;-]