LCD and method for driving same

A liquid crystal display (LCD, hereinafter), comprising:

• a LCD panel which is composed of gate bus lines, data bus lines intersecting said gate bus lines, switching elements respectively situated close by intersections of said gate and data bus lines and connected therewith, pixel electrodes respectively connected with said switching elements, common electrodes respectively situated opposite to said pixel electrodes, and liquid crystals respectively driven by said pixel and common electrodes,
• a ramp voltage-generating circuit for generating a reference voltage which is defined as a difference in a potential between an output terminal of said ramp voltage-generating circuit and said common electrodes,
• wherein an absolute value of said reference voltage varies periodically synchronizing with a signal for changing said gate bus line to be selected and decreases slowly in a predetermined period, and a sign of said reference voltage alternates between positive and negative whenever said gate bus line to be selected is changed,
• a data-driver circuit which is supplied with said reference voltage and video signals corresponding to respective pixels and generates brightness signals to be supplied to said respective data bus lines, and
• a gate-driver circuit which is connected with said respective gate bus lines and on/off controls said respective switching elements,
• wherein said absolute value of said reference voltage takes a maximum value after said sign thereof alternates, decreases slowly thereafter, and takes a minimum values in a final stage.