Liquid crystal display device, and method for driving the same

A liquid crystal display device, comprising:

• a plurality of first electrodes;
• a plurality of second electrodes crossing the first electrodes;
• a plurality of switching elements each provided in a vicinity of an intersection of a first electrode and a second electrode;
• a plurality of pixel electrodes respectively provided in a plurality of regions which are arranged in a matrix and partitioned from one another by the first electrodes and the second electrodes;
• a plurality of the first electrodes to each of which a gate voltage is applied for turning ON/OFF each of the switching elements;
• a plurality of the second electrodes to each of which a source voltage is applied;
• and
• a plurality of third electrodes to each of which a common voltage is applied, the third electrodes being arranged so that a liquid crystal layer is interposed between the third electrodes and the pixel electrodes, wherein:
• the liquid crystal display device further comprises a plurality of assist electrodes to each of which an assist voltage is applied, the assist electrodes having an assist capacitor being provided between each of the pixel electrodes and each of the assist electrodes;
• an image signal application period is defined as a period during which a voltage corresponding to an image signal is applied between the pixel electrode and the third electrode;
• an assist signal application period is defined as a period during which a voltage corresponding to an assist signal is applied between the pixel electrode and the third electrode;
• and
• the common voltage has different values between the image signal application period and the assist signal application period or the assist voltage has different values during the assist signal application period.

A liquid crystal display device, comprising:

• a plurality of first electrodes;
• a plurality of second electrodes crossing the first electrodes;
• a plurality of switching elements each provided in a vicinity of an intersection of a first electrode and a second electrode;
• a plurality of pixel electrodes respectively provided in a plurality of regions which are arranged in a matrix and partitioned from one another by the first electrodes and the second electrodes;
• a plurality of the first electrodes to each of which a gate voltage is applied for turning ON/OFF each of the switching elements;
• a plurality of the second electrodes to each of which a source voltage is applied;
• and
• a plurality of third electrodes to each of which a common voltage is applied, the third electrodes being arranged so that a liquid crystal layer is interposed between the third electrodes and the pixel electrodes, wherein:
• the liquid crystal display device further comprises a plurality of assist electrodes to each of which an assist voltage is applied, the assist electrodes having an assist capacitor being provided between each of the pixel electrodes and each of the first electrodes;
• an image signal application period is defined as a period during which a voltage corresponding to an image signal is applied between the pixel electrode and the third electrode;
• an assist signal application period is defined as a period during which a voltage corresponding to an assist signal is applied between the pixel electrode and the third electrode;
• and
• the common voltage has different values between the image signal application period and the assist signal application period or the assist voltage has different values during the assist signal application period.

A method for driving a liquid crystal display device, the liquid crystal display device comprising:

• a plurality of first electrodes;
• a plurality of second electrodes crossing the first electrodes;
• a plurality of switching elements each provided in a vicinity of an intersection of a first electrode and a second electrode;
• a plurality of pixel electrodes respectively provided in a plurality of regions which are arranged in a matrix and partitioned from one another by the first electrodes and the second electrodes;
• a plurality of the first electrodes to each of which a gate voltage is applied for turning ON/OFF each of the switching elements;
• a plurality of the second electrodes to each of which a source voltage is applied;
• and
• a plurality of third electrodes to each of which a common voltage is applied, the third electrodes being arranged so that a liquid crystal layer is interposed between the third electrodes and the pixel electrodes, wherein:
• the source voltage comprises a voltage corresponding to an image signal and another voltage corresponding to an assist signal, the method comprising the steps of:
• applying the common voltage during an image signal writing scanning period which is defined as a period during which the voltage corresponding to the image signal voltage is applied;
• and
• applying the common voltage during at least one assist signal writing scanning period which is defined as a period during which the voltage corresponding to the assist signal voltage is applied, wherein:
• the common voltage has different values between the image signal writing scanning period and the at least one assist signal writing scanning period.

A method for driving a liquid crystal display device, the liquid crystal display device comprising:

• a plurality of first electrodes;
• a plurality of second electrodes crossing the first electrodes;
• a plurality of switching elements each provided in a vicinity of an intersection of a first electrode and a second electrode;
• a plurality of pixel electrodes respectively provided in a plurality of regions which are arranged in a matrix and partitioned from one another by the first electrodes and the second electrodes;
• a plurality of the first electrodes to each of which a gate voltage is applied for turning ON/OFF each of the switching elements;
• a plurality of the second electrodes to each of which a source voltage is applied;
• and
• a plurality of third electrodes to each of which a common voltage is applied, the third electrodes being arranged so that a liquid crystal layer is interposed between the third electrodes and the pixel electrodes, wherein:
• the liquid crystal display device further comprises a plurality of assist electrodes to each of which an assist voltage is applied, the assist electrodes having an assist capacitor being provided between each of the pixel electrodes and each of the assist electrodes, the method comprising the steps of:
• applying a voltage corresponding to the image signal voltage between the pixel electrode and the third electrode during an image signal application period;
• and
• applying a voltage corresponding to the assist signal voltage is applied between the pixel electrode and the third electrode during an assist signal application period, wherein:
• the common voltage has different values between the image signal application period and the assist signal application period or the assist voltage has different values during the assist voltage application period.

A method for driving a liquid crystal display device, the liquid crystal display device comprising:

• a plurality of first electrodes;
• a plurality of second electrodes crossing the first electrodes;
• a plurality of switching elements each provided in a vicinity of an intersection of a first electrode and a second electrode;
• a plurality of pixel electrodes respectively provided in a plurality of regions which are arranged in a matrix and partitioned from one another by the first electrodes and the second electrodes;
• a plurality of the first electrodes to each of which a gate voltage is applied for turning ON/OFF each of the switching elements;
• a plurality of the second electrodes to each of which a source voltage is applied;
• and
• a plurality of third electrodes to each of which a common voltage is applied, the third electrodes being arranged so that a liquid crystal layer is interposed between the third electrodes and the pixel electrodes, wherein:
• the liquid crystal display device further comprises a plurality of assist electrodes to each of which an assist voltage is applied, the assist electrodes having an assist capacitor being provided between each of the pixel electrodes and each of the first electrodes, the method comprising the steps of:
• applying a voltage corresponding to an image signal between the pixel electrode and the third electrode during an image signal application period;
• and
• applying a voltage corresponding to an assist signal is applied between the pixel electrode and the third electrode during an assist signal application period, wherein:
• the common voltage has different values between the image signal application period and the assist signal application period or the assist voltage has different values during the assist signal application period.