Are you sure?
My impression was that active matrix LCDs worked a lot like DRAM. They had a transistor and a capacitor for each pixel (the transistor was added in the move from passive to active matrix), but the voltage on that capacitor decayed and needed to be periodically refreshed. I was unaware of LCD displays having any on-board memory from which to do the refresh, but that could have been added while I wasn't following the market, although I'd be surprised, since it seems like it'd be an unnecessary cost item.
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