The invention relates to an electromechanical brake with self-boosting by means of a wedge mechanism. in which R1 to R9 have the meanings shown in the claims. 0% by mass and one or more metals selected from Ta, Nb, Zr, Ni, Cr, Ge, Au, and Mo. Data in which the variation in threshold value is compensated with respect to the data of the data buffer is written to the memory cell. And a timing controller supplies the digital video data to the data driver, and controls the data driver and the gate driver, and wherein a polarity of data voltages, which are supplied to the liquid crystal display panel, is inverted for each liquid crystal cell and a polarity of a data voltage which is outputted from the data driver, is inverted for every two to four horizontal periods.