Liquid crystal display device, scan signal drive device, liquid crystal display device drive method, scan signal drive method, and television receiver

An active-matrix liquid crystal display device, including scanning signal lines extending in a row direction, data signal lines extending in a column direction, and pixels provided so as to respectively correspond to intersections of the scanning signal lines and the data signal lines,

• the liquid crystal display device comprising:
• a scanning signal driving section for sequentially applying gate-on pulses on the scanning signal lines, each of the gate-on pulses causing a scanning signal line to be in a selected state;
• a data signal driving section for applying data signals on the data signal lines such that a polarity of a data signal is inverted with respect to plural number of horizontal periods in one frame period,
• the scanning signal driving section is configured to apply the gate-on pulses such that a second period is longer than a first period,
• the first period and the second period being defined in such a manner that among gate-on pulses applied before a moment of polarity inversion of a data signal, when a last end of a gate-on pulse nearest to the moment of the polarity inversion is earlier than an end time of a horizontal period during which the gate-on pulse is applied, the first period starts at the last end of the gate-on pulse and ends at the end time of the horizontal period, and
• the second period starts at the moment of the polarity inversion and ends at a moment of an application start of a gate-on pulse nearest to the moment of the polarity inversion among gate-on pulses applied after the polarity inversion,
• the scanning signal lines are divided into one or more blocks, and scanning signal lines included in each block are divided into plural groups,
• the scanning signal driving section is configured to sequentially scan blocks of scanning signal lines and sequentially scan groups of scanning signal lines in each block such that the scanning signal lines in each block are interlace-scanned, and
• the data signal driving section is configured to apply data signals on the data signal lines such that a polarity of a data signal is inverted at a moment of switching groups of scanning signal lines to be scanned;
• and
• a display control circuit for supplying, to the scanning signal driving section, a gate start pulse signal serving as a signal to be asserted only for a period with respect to each one frame period, a gate clock signal generated based on a horizontal sync signal, and a scanning signal output control signal for controlling application of a gate-on pulse,
• when receiving the gate start pulse signal, the scanning signal driving section sequentially applying gate-on pulses on the scanning signal lines in accordance with clocks of the gate clock signal during a period in which the scanning signal output control signal permits application of the gate-on pulses, and
• the display control circuit configured to supply the gate start pulse signal, the gate clock signal, and the scanning signal output control signal such that the gate start pulse signal, the gate clock signal, and the scanning signal output control signal correspond to individual groups of scanning signal lines, wherein
• at individual moments, the display control circuit setting a scanning signal output control signal corresponding to a group to be scanned to be a state that permits application of gate-on pulses, and setting a scanning signal output control signal corresponding to a group not to be scanned to be a state that does not permit application of gate-on pulses, so as to cause the scanning signal driving section to perform driving by the interlace scan, and
• at the moment of the polarity inversion of a data signal, the display control circuit keeps, at a value, a gate clock signal corresponding to a group not to be scanned after the moment of the polarity inversion.

An active-matrix liquid crystal display device, including scanning signal lines extending in a row direction, data signal lines extending in a column direction, and pixels provided so as to respectively correspond to intersections of the scanning signal lines and the data signal lines,

• the liquid crystal display device comprising:
• a scanning signal driving section for sequentially applying gate-on pulses on the scanning signal lines, each of the gate-on pulses causing a scanning signal line to be in a selected state;
• a data signal driving section for applying data signals on the data signal lines such that a polarity of a data signal is inverted with respect to plural number of horizontal periods in one frame period,
• the scanning signal driving section is configured to apply the gate-on pulses such that a second period is longer than a first period,
• the first period and the second period being defined in such a manner that among gate-on pulses applied before a moment of polarity inversion of a data signal, when a last end of a gate-on pulse nearest to the moment of the polarity inversion is earlier than an end time of a horizontal period during which the gate-on pulse is applied, the first period starts at the last end of the gate-on pulse and ends at the end time of the horizontal period, and
• the second period starts at the moment of the polarity inversion and ends at a moment of an application start of a gate-on pulse nearest to the moment of the polarity inversion among gate-on pulses applied after the polarity inversion,
• the scanning signal lines are divided into one or more blocks, and scanning signal lines included in each block are divided into plural groups,
• the scanning signal driving section is configured to sequentially scan blocks of scanning signal lines and sequentially scans groups of scanning signal lines in each block such that the scanning signal lines in each block are interlace-scanned, and
• the data signal driving section is configured to apply data signals on the data signal lines such that a polarity of a data signal is inverted at a moment of switching groups of scanning signal lines to be scanned;
• and
• a display control circuit for supplying, to the scanning signal driving section, a gate start pulse signal serving as a signal to be asserted only for a period with respect to each one frame period, a gate clock signal generated based on a horizontal sync signal, and a scanning signal output control signal for controlling application of a gate-on pulse,
• when receiving the gate start pulse signal, the scanning signal driving section sequentially applying gate-on pulses on the scanning signal lines in accordance with clocks of the gate clock signal during a period in which the scanning signal output control signal permits application of the gate-on pulses, and
• the display control circuit configured to supply the gate start pulse signal, the gate clock signal, and the scanning signal output control signal such that the gate start pulse signal, the gate clock signal, and the scanning signal output control signal correspond to individual groups of scanning signal lines, wherein
• the scanning signal driving section includes shift registers respectively corresponding to individual groups of scanning signal lines and AND logic operation sections respectively corresponding to scanning signal lines,
• each of the shift registers is configured to receive a gate start pulse signal and a gate clock signal that correspond to a group of scanning signal lines, and
• the AND logic operation section performs AND logic operation of an output of said each of the shift registers and logic inversion of the scanning signal output control signal, and supplies a result of the AND logic operation as a gate-on pulse to the scanning signal lines.

An active-matrix liquid crystal display device, including scanning signal lines extending in a row direction, data signal lines extending in a column direction, and pixels provided so as to respectively correspond to intersections of the scanning signal lines and the data signal lines,

• the liquid crystal display device comprising:
• a scanning signal driving section for sequentially applying gate-on pulses on the scanning signal lines, each of the gate-on pulses causing a scanning signal line to be in a selected state;
• a data signal driving section for applying data signals on the data signal lines such that a polarity of a data signal is inverted with respect to plural number of horizontal periods in one frame period,
• the scanning signal driving section is configured to apply the gate-on pulses such that a second period is longer than a first period,
• the first period and the second period being defined in such a manner that among gate-on pulses applied before a moment of polarity inversion of a data signal, when a last end of a gate-on pulse nearest to the moment of the polarity inversion is earlier than an end time of a horizontal period during which the gate-on pulse is applied, the first period starts at the last end of the gate-on pulse and ends at the end time of the horizontal period, and
• the second period starts at the moment of the polarity inversion and ends at a moment of an application start of a gate-on pulse nearest to the moment of the polarity inversion among gate-on pulses applied after the polarity inversion;
• and
• a display control circuit for supplying, to the data signal driving section, a data signal and a data signal application control signal for controlling timing with which the data signal driving section applies the data signal on a data signal line,
• a plurality of video data that respectively correspond to data signal lines being sequentially supplied from an external signal source to the display control circuit with an interval between the plurality of video data, and
• the display control circuit is configured to regard a number of video data as a set in accordance with polarity inversion, inserts dummy data at a position of the set, assigns a dummy insertion period to an output of a signal potential corresponding to the dummy data, and assigns a horizontal period shorter than the interval to an output of a signal potential corresponding to each video data, wherein a product of the number of video data in a set and the interval is equal to a sum of a whole dummy insertion period assigned to dummy data in the set and a whole horizontal period assigned to the video data in the set.

The An active-matrix liquid crystal display device, including scanning signal lines extending in a row direction, data signal lines extending in a column direction, and pixels provided so as to respectively correspond to intersections of the scanning signal lines and the data signal lines,

• the liquid crystal display device comprising:
• a scanning signal driving section for sequentially applying gate-on pulses on the scanning signal lines, each of the gate-on pulses causing a scanning signal line to be in a selected state;
• a data signal driving section for applying data signals on the data signal lines such that a polarity of a data signal is inverted with respect to plural number of horizontal periods in one frame period,
• the scanning signal driving section is configured to apply the gate-on pulses such that a second period is longer than a first period,
• the first period and the second period being defined in such a manner that among gate-on pulses applied before a moment of polarity inversion of a data signal, when a last end of a gate-on pulse nearest to the moment of the polarity inversion is earlier than an end time of a horizontal period during which the gate-on pulse is applied, the first period starts at the last end of the gate-on pulse and ends at the end time of the horizontal period, and
• the second period starts at the moment of the polarity inversion and ends at a moment of an application start of a gate-on pulse nearest to the moment of the polarity inversion among gate-on pulses applied after the polarity inversion;
• and
• a display control circuit for supplying, to the data signal driving section, a data signal and a data signal application control signal for controlling timing with which the data signal driving section applies the data signal on a data signal line,
• a plurality of video data that respectively correspond to data signal lines being sequentially supplied from an external signal source to the display control circuit with an interval between the plurality of video data, and
• the display control circuit is configured to regards a number of video data as a set in accordance with polarity inversion, assigns one or more dummy insertion periods as well as one horizontal period to an output of a signal potential corresponding to first video data in each set, and assigns a horizontal period shorter than the interval to outputs of signal potentials respectively corresponding to individual video data other than the first video data in each set.

An active-matrix liquid crystal display device, including scanning signal lines extending in a row direction, data signal lines extending in a column direction, and pixels provided so as to respectively correspond to intersections of the scanning signal lines and the data signal lines,

• the liquid crystal display device comprising:
• a scanning signal driving section for sequentially applying gate-on pulses on the scanning signal lines, each of the gate-on pulses causing a scanning signal line to be in a selected state;
• a data signal driving section for applying data signals on the data signal lines such that a polarity of a data signal is inverted with respect to plural number of horizontal periods in one frame period,
• the scanning signal driving section is configured to apply the gate-on pulses such that a second period is longer than a first period,
• the first period and the second period being defined in such a manner that among gate-on pulses applied before a moment of polarity inversion of a data signal, when a last end of a gate-on pulse nearest to the moment of the polarity inversion is earlier than an end time of a horizontal period during which the gate-on pulse is applied, the first period starts at the last end of the gate-on pulse and ends at the end time of the horizontal period, and
• the second period starts at the moment of the polarity inversion and ends at a moment of an application start of a gate-on pulse nearest to the moment of the polarity inversion among gate-on pulses applied after the polarity inversion;
• and
• a display control circuit for supplying, to the data signal driving section, a data signal and a data signal application control signal for controlling timing with which the data signal driving section applies the data signal on a data signal line,
• a plurality of video data that respectively correspond to data signal lines being sequentially supplied from an external signal source to the display control circuit with an interval between the plurality of video data, and
• the display control circuit is configured to regard certain number of video data as a set in accordance with polarity inversion, inserts dummy data at a position of the set, assigns a dummy insertion period to an output of a signal potential corresponding to the dummy data, and assigns a horizontal period shorter than the interval to an output of a signal potential corresponding to each video data, wherein the dummy insertion period is equal to one horizontal period.

An active-matrix liquid crystal display device, including scanning signal lines extending in a row direction, data signal lines extending in a column direction, and pixels provided so as to respectively correspond to intersections of the scanning signal lines and the data signal lines,

• the liquid crystal display device comprising:
• a scanning signal driving section for sequentially applying gate-on pulses on the scanning signal lines, each of the gate-on pulses causing a scanning signal line to be in a selected state;
• a data signal driving section for applying data signals on the data signal lines such that a polarity of a data signal is inverted with respect to plural number of horizontal periods in one frame period,
• the scanning signal driving section is configured to apply the gate-on pulses such that a second period is longer than a first period,
• the first period and the second period being defined in such a manner that among gate-on pulses applied before a moment of polarity inversion of a data signal, when a last end of a gate-on pulse nearest to the moment of the polarity inversion is earlier than an end time of a horizontal period during which the gate-on pulse is applied, the first period starts at the last end of the gate-on pulse and ends at the end time of the horizontal period, and
• the second period starts at the moment of the polarity inversion and ends at a moment of an application start of a gate-on pulse nearest to the moment of the polarity inversion among gate-on pulses applied after the polarity inversion;
• and
• a display control circuit for supplying, to the data signal driving section, a data signal and a data signal application control signal for controlling timing with which the data signal driving section applies the data signal on a data signal line,
• a plurality of video data that respectively correspond to data signal lines being sequentially supplied from an external signal source to the display control circuit with an interval between the plurality of video data, and
• the display control circuit is configured to regard certain number of video data as a set in accordance with polarity inversion, inserts dummy data at a position of the set, assigns a dummy insertion period to an output of a signal potential corresponding to the dummy data, and assigns a horizontal period shorter than the interval to an output of a signal potential corresponding to each video data, wherein the dummy insertion period is shorter than one horizontal period.

An active-matrix liquid crystal display device, including scanning signal lines extending in a row direction, data signal lines extending in a column direction, and pixels provided so as to respectively correspond to intersections of the scanning signal lines and the data signal lines,

• the liquid crystal display device comprising:
• a scanning signal driving section for sequentially applying gate-on pulses on the scanning signal lines, each of the gate-on pulses causing a scanning signal line to be in a selected state
• a data signal driving section for applying data signals on the data signal lines such that a polarity of a data signal is inverted with respect to plural number of horizontal periods in one frame period,
• the scanning signal driving section is configured to apply the gate-on pulses such that a second period is longer than a first period,
• the first period and the second period being defined in such a manner that among gate-on pulses applied before a moment of polarity inversion of a data signal, when a last end of a gate-on pulse nearest to the moment of the polarity inversion is earlier than an end time of a horizontal period during which the gate-on pulse is applied, the first period starts at the last end of the gate-on pulse and ends at the end time of the horizontal period,
• the second period starts at the moment of the polarity inversion and ends at a moment of an application start of a gate-on pulse nearest to the moment of the polarity inversion among gate-on pulses applied after the polarity inversion, and
• the scanning signal driving section is configured to provide (1) a main charging period in which the scanning signal driving section causes one of the scanning signal lines to be in a selected state such that the data signal lines apply voltages on individual pixels;
• and (2) a pre-charging period in which the scanning signal driving section causes said one of the scanning signal lines to be in a selected state before the main charging period;
• and
• a display control circuit for supplying, to the scanning signal driving section, a gate start pulse signal serving as a signal to be asserted only for a period with respect to each one frame period, a gate clock signal generated based on a horizontal sync signal, and a scanning signal output control signal for controlling application of a gate-on pulse,
• when receiving the gate start pulse signal, the scanning signal driving section sequentially applies gate-on pulses on the scanning signal lines in accordance with clocks of the gate clock signal during the pre-charging period that is a period in which the scanning signal output control signal permits application of the gate-on pulses, and the scanning signal driving section sequentially applies gate-on pulses on the scanning signal lines in accordance with clocks of the gate clock signal during the main charging period, wherein
• the display control circuit is further configured to supply to the scanning signal driving section a selection signal for selecting one of two states,
• when the scanning signal driving section receives the gate start pulse signal,
• if one of the two states is selected in response to the selection signal, the scanning signal driving section sequentially applies gate-on pulses on the scanning signal lines in accordance with clocks of the gate clock signal during the pre-charging period that is a period in which the scanning signal output control signal permits application of the gate-on pulses, and
• if the other of the two states is selected in response to the selection signal, the scanning signal driving section sequentially applies gate-on pulses on the scanning signal lines in accordance with clocks of the gate clock signal during the main charging period.

An active-matrix liquid crystal display device, including scanning signal lines extending in a row direction, data signal lines extending in a column direction, and pixels provided so as to respectively correspond to intersections of the scanning signal lines and the data signal lines,

• the liquid crystal display device comprising:
• a scanning signal driving section for sequentially applying gate-on pulses on the scanning signal lines, each of the gate-on pulses causing a scanning signal line to be in a selected state
• a data signal driving section for applying data signals on the data signal lines such that a polarity of a data signal is inverted with respect to plural number of horizontal periods in one frame period,
• the scanning signal driving section is configured to apply the gate-on pulses such that a second period is longer than a first period,
• the first period and the second period being defined in such a manner that among gate-on pulses applied before a moment of polarity inversion of a data signal, when a last end of a gate-on pulse nearest to the moment of the polarity inversion is earlier than an end time of a horizontal period during which the gate-on pulse is applied, the first period starts at the last end of the gate-on pulse and ends at the end time of the horizontal period,
• the second period starts at the moment of the polarity inversion and ends at a moment of an application start of a gate-on pulse nearest to the moment of the polarity inversion among gate-on pulses applied after the polarity inversion, and
• the scanning signal driving section is configured to provide (1) a main charging period in which the scanning signal driving section causes one of the scanning signal lines to be in a selected state such that the data signal lines apply voltages on individual pixels;
• and (2) a pre-charging period in which the scanning signal driving section causes said one of the scanning signal lines to be in a selected state before the main charging period;
• and
• a display control circuit for supplying, to the scanning signal driving section, a gate start pulse signal serving as a signal to be asserted only for a period with respect to each one frame period, a gate clock signal generated based on a horizontal sync signal, and a scanning signal output control signal for controlling application of a gate-on pulse,
• when receiving the gate start pulse signal, the scanning signal driving section sequentially applies gate-on pulses on the scanning signal lines in accordance with clocks of the gate clock signal during the pre-charging period that is a period in which the scanning signal output control signal permits application of the gate-on pulses, and the scanning signal driving section sequentially applies gate-on pulses on the scanning signal lines in accordance with clocks of the gate clock signal during the main charging period, wherein
• the scanning signal driving section includes a first flip-flop, a second flip-flop, a first output mask, a second output mask, and an OR logic operation section,
• the first flip-flop is configured to receive the gate start pulse signal and outputs a first output signal based on the gate clock signal,
• the second flip-flop is configured to receive the first output signal and outputs a second output signal based on the gate clock signal,
• the first output mask is configured to output a signal obtained by masking the first output signal with use of the scanning signal output control signal,
• the second output mask is configured to output the second output signal only during a period in which the gate clock signal is in L level, and
• the OR logic operation section is configured to output, as a gate-on pulse, a result of OR logic operation of the signal from the first output mask and the signal from the second output mask to individual scanning signal lines.