Patent ID: 9570022
Date: 2017-02-14
CPC Classifications: G02B,G09G

Claim:
1. A liquid crystal display device comprising: a liquid crystal panel of a normally black type which receives a plurality of scan signals and receives a common voltage having a voltage level, which periodically varies; and a backlight unit which provides backlight to the liquid crystal panel, wherein the plurality of scan signals sequentially has a scan-on voltage along a first direction, a first period when the plurality of scan signals sequentially has the scan-on voltage once in the first direction is defined as a scan period, the voltage level of the common voltage increases or decreases during a second period between first scan period and a second scan period after the first scan period and during a third period between the second scan period and a third scan period after the second scan period, the backlight has a luminance which is increased along the first direction during the third period, and the luminance of the backlight does not increase along the first direction during at least one of the first scan period, the second period and the second scan period.