In my subbing days I always wrote the plurals without apostrophes: "the 1960s", "CDs", "LCDs". The thing is that it is rarely necessary. If, however, something is entirely in lower-case letters, as with "p's" and "q's", the apostrophe makes it easier to read.
By the way one could argue that an apostrophe is needed after the "s" in your sentence, viz:
"That LCD's display is not quite as sharp as those other LCDs'." since it means "not as sharp as those of the other LCDs"
Last edited by DMB; 09-20-2011 at 05:27 AM.
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