Patent ID: 7525559

Claim:
A liquid crystal display device which includes a liquid crystal panel and a drive circuit, wherein: the drive circuit stores as a Look-up Table an optimum level of a test signal consisting of either only an overshoot signal or both an overshoot signal and an undershoot signal in accordance with tone transition from an original tone to an attainment tone; and the optimum level is set to a level of the test signal that corresponds to an optimum one of display results, which is obtained by an evaluation method that has the steps of repeatedly supplying to the liquid crystal panel, (i) a signal corresponding to an original tone and then, in accordance with tone transition, (ii) the test signal, that is either only the overshoot signal or both the overshoot signal and the undershoot signal, and (iii) a signal corresponding to an attainment tone sequentially in this order while sweeping a level of the test signal, so as to analyze display results of the liquid crystal panel; and in accordance with analysis results, determining the optimum level of the test signal in association with the original tone and the attainment tone, wherein the optimum one of the display results is a display result of the display results where the attainment tone is substantially displayed faster than a remainder of the display results without exceeding the attainment tone.