`
`1.
`
`A liquid crystal display device comprising:
`
`a plurality of pixels comprising a first pixel group corresponding to odd-
`
`numbered lines extending along gate signal lines and a second pixel group
`
`corresponding to even-numbered lines extending along the gate signal lines;
`
`an alternation signal transmitter outputting an alternation signal;
`
`an alternating circuit alternating polarities of voltages applied to the plurality of
`
`pixels for every frame period with respectto the alternation signal:
`
`10
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`a first accumulator accumulating signal levels of pixel data of the first pixel
`
`group for every frame period, and outputting a first value;
`
`a second accumulator accumulating signal levels of pixel data of the second
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`pixel group for every frame period, and outputting a second value; and
`
`a subtracter receiving the first value and the second value, and outputting a
`
`15
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`result of subtraction between the first value and the second value;
`
`wherein the alternation signal transmitter outputs a first alternation signal to
`
`the alternating circuit when the result of the subtraction is less than a reference
`
`value, and the alternation signal transmitter outputs a second alternation signal to
`
`the alternating circuit when the result of the subtraction is not less than the reference
`
`29
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`value.
`
`2.
`
`A liquid crystal display device according to claim 1, wherein the reference
`
`value is changeable from outside of the liquid crystal display.
`
`25
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`3.
`
`A liquid crystal display device according to claim 1, wherein phasesofthefirst
`
`alternation signal and the secondalternation signal are shifted by 180°.
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`20
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`
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