Active matrix liquid crystal display and method of driving the same

A method of driving an active matrix liquid crystal display, said active matrix display including a plurality of display cells that are arrayed in scan lines between a top row and a bottom row, in which:

• active elements provided for respective, matrix-forming display cells scan the display cells in response to a scan signal a scan line at a time for selection;
• a signal voltage is written to display electrodes in selected ones of the display cells;
• a drive voltage determined by the signal voltage and a common voltage is applied across liquid crystal by applying the common voltage to an opposite electrode positioned opposite to the display electrodes;
• and
• the signal voltage changes in polarity with respect to the common voltage in each frame,
• wherein:
• a non-scan period during which the signal voltage is retained and no new signal voltage is written is provided immediately following a scan period in which the signal voltage is written to some of the display cells corresponding to one screen, said scan period being measured from a leading edge of the scan signal output to the matrix-forming display cells arrayed in the top row sequentially to a trailing edge of the scan signal output to the matrix-forming display cells arrayed in the bottom row and said non-scan period being measured from the trailing edge of the scan signal output to the matrix-forming display cells arrayed in the bottom row to a leading edge of a subsequent scan signal output to the matrix-forming display cells arrayed in the top row, the non-scan period being equal to or longer than the scan period;
• and
• the signal voltage changes in polarity with respect to the common voltage in the non-scan period.

An active matrix liquid crystal display, said active matrix display includes a plurality of display cells that are arrayed in scan lines between a top row and a bottom row, in which:

• active elements provided for respective, matrix-forming display cells scan the display cells in response to a scan signal a scan line at a time for selection;
• a signal voltage is written to display electrodes in selected ones of the display cells;
• a drive voltage determined by the signal voltage and a common voltage is applied across liquid crystal by applying the common voltage to an opposite electrode positioned opposite to the display electrodes;
• and
• the common voltage changes in polarity with respect to the signal voltage in each frame,
• the active matrix liquid crystal display comprising:
• non-scanning means for providing a non-scan period during which the signal voltage is retained and no new signal voltage is written, immediately following a scan period in which the signal voltage is written to some of the display cells corresponding to one screen, said scan period being measured from a leading edge of the scan signal output to the matrix-forming display cells arrayed in the top row sequentially to a trailing edge of the scan signal output to the matrix-forming display cells arrayed in the bottom row and said non-scan period being measured from the trailing edge of the scan signal output to the matrix-forming display cells arrayed in the bottom row to a leading edge of a subsequent scan signal output to the matrix-forming display cells arrayed in the top row, the non-scan period being equal to or longer than the scan period;
• and
• inversion control means for changing the common voltage in polarity with respect to the signal voltage in the non-scan period.

An active matrix liquid crystal display, said active matrix display includes a plurality of display cells that are arrayed in scan lines between a top row and a bottom row, in which:

• active elements provided for respective, matrix-forming display cells scan the display cells in response to a scan signal a scan line at a time for selection;
• a signal voltage is written to display electrodes in selected ones of the display cells;
• a drive voltage determined by the signal voltage and a common voltage is applied across liquid crystal by applying the common voltage to an opposite electrode positioned opposite to the display electrodes;
• and
• the signal voltage changes in polarity with respect to the common voltage in each frame,
• the active matrix liquid crystal display comprising:
• non-scanning means for providing a non-scan period during which the signal voltage is retained and no new signal voltage is written, immediately following a scan period in which the signal voltage is written to some of the display cells corresponding to one screen, said scan period being measured from a leading edge of the scan signal output to the matrix-forming display cells arrayed in the top row sequentially to a trailing edge of the scan signal output to the matrix-forming display cells arrayed in the bottom row and said non-scan period being measured from the trailing edge of the scan signal output to the matrix-forming display cells arrayed in the bottom row to a leading edge of a subsequent scan signal output to the matrix-forming display cells arrayed in the top row, the non-scan period being equal to or longer than the scan period;
• and
• inversion control means for changing the signal voltage in polarity with respect to the common voltage in the non-scan period.