I am not an expert on this but if I may hazard a guess, the problem you are describing might be "lit pixel" phenomenon.
This is discussed
here.:
Quote:
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There are two phenomenon [sic] which define a defective LCD pixel: a "lit" pixel, which appears as a red, blue and/or green dot on an all-black background; or a "missing" or "dead" pixel, which appears as a black dot on all-white backgrounds... The "lit" pixel phenomenon, more common than "missing/dead" pixels, results when a transistor occasionally shorts on and results in a permanently "turned-on" (red, green or blue) sub-pixel. There are some possible corrective measures, such as "killing" a transistor using a laser during the manufacturing process, however, this just creates black dots, which would appear on a white background. Fixing the transistor itself is not possible after assembly. Turned on or "lit" sub-pixels are a fairly common occurrence in LCD manufacturing and do not, in and of themselves, mean that the finished panel will not deliver a high quality image.
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If its bothering you enough, I'd have the unit replaced.