Liquid crystal display device

A liquid crystal display device comprising a liquid crystal display panel and having a pixel, the liquid crystal display panel including a first substrate and a second substrate opposed to each other and a liquid crystal layer interposed between the first substrate and the second substrate, wherein,

• the first substrate includes an upper electrode provided for the pixel, and a lower electrode disposed under the upper electrode via an insulating layer, the lower electrode generating a lateral field across the liquid crystal layer with the upper electrode;
• the second substrate includes a counter electrode opposed to the upper electrode and the lower electrode, the counter electrode generating a vertical field across the liquid crystal layer with the upper electrode and the lower electrode;
• the pixel is capable of switchably presenting
• a black displaying state of performing black displaying with a vertical field generated across the liquid crystal layer,
• a white displaying state of performing white displaying with a lateral field generated across the liquid crystal layer, or
• a transparent displaying state in which a rear face side of the liquid crystal display panel is visible in a see-through manner with no voltage being applied to the liquid crystal layer;
• the upper electrode includes a plurality of branch portions extending along a predetermined direction, and at least one slit interposed between two mutually adjacent branch portions among the plurality of branch portions;
• each of the plurality of branch portions has a width L which is equal to or greater than a width S of each of the at least one slit;
• one vertical scanning period includes at least one write period in which a displaying voltage is written to the pixel;
• a vertical scanning period is designated a first vertical scanning period, and a vertical scanning period that immediately follows the first vertical scanning period is designated a second vertical scanning period, and
• (A) when the first vertical scanning period and the second vertical scanning period are to display a same gray scale level and the pixel is to perform white displaying in the second vertical scanning period, the second vertical scanning period includes a write period in which a first potential difference V1 which is 60% or less of a potential difference V0 between the lower electrode and the counter electrode in the black displaying state is to be given to the upper electrode and the lower electrode,
• (B) when the first vertical scanning period and the second vertical scanning period are to display different gray scale levels and the pixel is to perform white displaying in the second vertical scanning period, the second vertical scanning period includes a write period in which a second potential difference V2 being greater than the first potential difference V1 is to be given to the upper electrode and the lower electrode;
• in a write period in which the first potential difference V1 is to be given to the upper electrode and the lower electrode, substantially a same potential as that of the counter electrode is given to the upper electrode, and a different potential from that of the counter electrode is given to the lower electrode;
• and
• in a write period in which the second potential difference V2 is to be given to the upper electrode and the lower electrode, substantially a same potential as that of the counter electrode is given to the lower electrode, and a different potential from that of the counter electrode is given to the upper electrode.