and upon the negative u2212 driving is reduced alternatively the liquid crystal display device has a voltage level which is required for driving and which is different by kinds and by sizes accordingly the second gate high voltage vgh 2 is set to be a value which is optimized experimentally to be suitable for the subject fig6 illustrates a circuit configuration of the first and second level shifters ls 1 ls 2 and the first and second stages s 1 s 2 of the shift register 61 in the gate drive circuit 52 shown in fig5 fig7 illustrates waveforms of the drive signals fig8 a and 8b are diagrams that illustrate a drive signal waveform upon the line inversion the operation of the gate drive circuit 52 will be explained with reference to fig6 and 8b in one embodiment the second to n th stages s 2 to sn of the shift register 61 has the same circuit configuration as the first stage s 1 except that the shift output signal vs 1 to vs n 1 of the pre stage s 1 to s n 1 instead of the gate start pulse is supplied as the shift input signal and the second to n th level shifter ls 2 to lsn also have the same circuit configuration as the first level shifter ls 1 accordingly the operation description will be made on the basis of.