Method of driving liquid crystal display device that reduces afterimages

A method of driving a liquid crystal display device which comprises a plurality of column lines, a plurality of row lines and a plurality of pixels, each of said pixels including a display element and a non-linear resistance element connected in series between each of said column lines and said row lines, said method of driving the liquid crystal display device comprising the steps of:

• applying a first voltage between each of said column lines and each of said row lines so that a display data is supplied to said display element of each of the pixels, in a data writing period of the pixels;
• applying a lower voltage than said first voltage between each of said column lines and each of said row lines, in a data non-writing period of the pixels after said data writing period;
• applying a second voltage higher than said lower voltage between each of said column lines and each of said row lines, in a compensatory period of the pixel before said data writing period and after said data non-writing period, wherein
• said second voltage in said compensatory period has a polarity opposite to that of said first voltage in said data writing period,
• a RMS of said second voltage in said compensatory period and a RMS of said first voltage in said data writing period are in a relation where:
• the RMS of said second voltage is large when the RMS of said first voltage is small, and the RMS of said second voltage is small when the RMS of said first voltage is large.

A method of driving a liquid crystal display device that comprises a plurality of column lines, a plurality of row lines and a plurality of pixels including a display element and a non-linear resistance element connected in series between each of said column lines and row lines, said method of driving the liquid crystal display device comprising the steps of:

• applying a scanning signal to each of said row lines, said scanning signal having a data writing voltage in a data writing period, a data holding voltage in a holding period after said data writing period and a compensatory voltage in a compensatory period before said data writing period;
• applying a data signal to each of said column lines, said data signal having a pulse-width modulation signal, wherein absolute values of said data writing voltage and said data compensatory voltage are greater than an absolute value of said data holding voltage with respect to a middle potential of said data signal, said data writing voltage has a polarity different from that of said compensatory voltage with respect to the middle potential of said data signal, a first difference signal between said writing voltage of the scanning signal and said pulse-width modulation signal is applied to the pixel in said data writing period and a second difference signal between said compensatory voltage of the scanning signal and said pulse-width modulation signal is applied to the pixel in said compensatory period and a ratio of pulse duty of said pulse-width modulation signal in said compensatory period is large when a ratio of pulse duty of said pulse-width modulation signal in said data writing period is large, but small when a ratio of pulse duty of said pulse-width modulation signal in said data writing period is small, thereby a ratio of the pulse duty of said second difference signal is small when a ratio of pulse duty of said first difference signal is large, but large when a ratio of pulse duty of said first difference signal is small.

A method of driving a liquid crystal display device which comprises a plurality of column lines, a plurality of row lines and a plurality of pixels including a display element and a non-linear resistance element connected in series between each of said column lines and row lines, said method of driving the liquid crystal display device comprising the steps of:

• applying a scanning signal to each of said row lines, said scanning signal having a data writing voltage in a data writing period, a data holding voltage in a holding period after said data writing period and a compensatory voltage in a compensatory period before said data writing period;
• applying a data signal to each of said column lines, said data signal being an analog signal having multiple potential levels, wherein absolute values of said data writing voltage and said compensatory voltage are greater than an absolute value of said data holding voltage width respect to a middle potential of said data signal, and said data writing voltage has a polarity different from that of said compensatory voltage with respect to the middle potential of said data signal, a first difference voltage between said writing voltage of the scanning signal and said data signal is applied to the pixel in said data writing period and a second difference voltage between said compensatory voltage of the scanning signal and said data signal is applied to the pixel in said compensatory period, an absolute value of said potential level of the data signal maintaining a same level in said compensatory period and said data writing period, thereby an absolute value of said second difference voltage is small when an absolute value of said first difference voltage is large, but large when an absolute value of said first difference voltage is small.

A method of driving a liquid crystal display device which comprises a plurality of column lines, a plurality of row lines and a plurality of pixels including a display element and a non-linear resistance element connected in series between each of said column lines and row lines, said method of driving the liquid crystal display device comprising the steps of:

• applying a scanning signal to each of said row lines, said scanning signal having a data writing voltage in a data writing period, a data holding voltage in a holding period after said data writing period and a compensatory voltage in a compensatory period before said data writing period;
• applying a data signal to each of said column lines, wherein said data writing voltage and said compensatory voltage are greater than said data holding voltage with respect to a middle potential of said data signal, and said data writing voltage has a polarity different from that of said compensatory voltage with respect to the middle potential of said data signal, said compensatory period being overlapped by a flyback period of a video signal which said data signal is generated based on, wherein the following formula is satisfied:
• TA/(TA+TB)≦¼,
• where TA is said compensatory period and TB is said data writing period.

A method of driving a liquid crystal display device that comprises a plurality of first electrodes and a plurality of second electrodes, said first and second electrodes defining a plurality of pixels, each pixel comprising a series connection of a liquid crystal layer and a two-terminal element having a non-linear voltage-current characteristic, said series connection being connected between a respective one of said first electrodes and a respective one of said second electrodes, said method comprising:

• applying a scanning signal to said first electrodes and a data signal to said second electrodes thereby applying a difference signal between said scanning signal and said data signal across each pixel, said difference signal including for each pixel:
• a write period TB for selecting the pixel and charging the liquid crystal layer corresponding to the pixel in accordance with a data charge voltage applied based on said difference signal, said data charge voltage changing in accordance with the grey scale levels to be displayed,
• a hold period following said write period TB for applying an absolute value of said difference signal smaller than that during said write period, and
• a compensatory period TA preceding said write period TB and following a previous hold period, for charging said liquid crystal layer in accordance with a compensatory charge voltage applied based on said difference signal,
• wherein the polarity of said compensatory charge voltage is opposite to that of said data charge voltage and said compensatory charge voltage is varied so as to increase when said data charge voltage decreases and to decrease when said data charge voltage increases.