MacBook 2010 occasionally got color-grain-pattern display

since I update to Lion in July, I occasionally experiencing color-grain-pattern (usually yellow), it happen when MacBook is on dual-display mode with my 1920x1080 external display (BenQ VW2420H). it could happen on every application (but I mostly seen on Google Chrome)
the phenomenon will disappear after I scroll the page or got something overlay that area (like move cursor on it).
but the most weird is I can capture it with cmd+shift+3 (cmd+shift+4 will overlay it and make it disappear) so is that mean it shouldn't be a hardware problem??
has anyone got an idea? or experienced this?
I got full screenshot posted in my blog. http://blog.mng.name/?p=767 (text is written in Thai)

Hello!
May I ask what was the issue in this case?
I'm experiencing the same troubles with my Mac now...
And it's already out of provided guarantee period, so I would be thankfull for any additional infos.
Best Regards!

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