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Sounds like dithering, a method of drawing more colours than you can actually draw by combining groups of pixels of one colour with groups of another to create the appearance of a solid colour.
Most LCD and Plasma screens do this but PC monitors shouldn't, they should have full 8bit RGB colour at least (RGB 4:4:4 as in each pixel should be able to produce 256 unique shades of colour for each RBG subpixel).
It's possible that as it's a laptop they've skimped a bit on the panel to save costs, I can't find any technical specs for it except that it's listed as 1366x768 TN (Twisted Nematic) which would mean it should have a good to great pixel response time but pay for that with a narrower viewing angle and smaller colour gamut (typically between 70 and 80% of NTSC).
Try having a look at some of the test images here LCD monitor test images to see if you can spot the same effect and if so which colours are doing it and if you can mitigate it with contrast/brightness settings (which you often can as it's usually the darker end of the spectrum where dithering occurs). You could also try contacting Lenovo's tech support to see if they have a proper colour profile or even a monitor driver that should be installed or if there's a setting that's incorrect somewhere.