Liquid crystal display device and driving method compensating grayscale data voltages to offset voltages of common electrode (VCOM) shift

A display driving apparatus comprising:

• a compensation table acquirer, which is configured to acquire a grayscale data voltage compensation table, wherein the grayscale data voltage compensation table stores mapping relationship between voltages of common electrodes (VCOM) shift amplitudes and grayscale data voltage compensation values;
• a calculator, which is configured to calculate a VCOM shift amplitude corresponding to a row of sub-pixels on the display panel based on grayscale data voltages of a frame of image to be displayed;
• a compensation value acquirer, which is coupled to the compensation table acquirer and the calculator and configured to obtain a grayscale data voltage compensation value corresponding to the row of sub-pixels on the display panel based on the calculated VCOM shift amplitude and the grayscale data voltage compensation table;
• a compensator, which is coupled to the compensation value acquirer and configured to compensate the grayscale data voltages actually inputted to the row of sub-pixels based on the grayscale data voltage compensation value to obtain compensated grayscale data voltages;
• and
• a grayscale data voltage outputer, which is coupled to the compensator and configured to output the compensated grayscale data voltages to the row of sub-pixels during display time of the frame of image to be displayed;
• wherein the calculator comprises:
• a grayscale data voltage acquirer, which is configured to acquire a plurality of grayscale data voltages respectively corresponding to a plurality of sub-pixels of the row of sub-pixels among the grayscale data voltages of the frame of image to be displayed, each of the grayscale data voltages corresponding to a sub-pixel of the row of sub-pixels;
• a first calculator, which is coupled to the grayscale data voltage acquirer and configured to add the grayscale data voltages of a positive polarity among the plurality of grayscale data voltages to obtain a first shift value;
• a second calculator, which is coupled to the grayscale data voltage acquirer and configured to add absolute values of the grayscale data voltages of a negative polarity among the plurality of grayscale data voltages to obtain a second shift value;
• and
• a third calculator, which is coupled to the first calculator and the second calculator and configured to subtract the second shift value from the first shift value to obtain the VCOM shift amplitude.

A display driving apparatus comprising:

• a compensation table acquirer, which is configured to acquire a grayscale data voltage
• compensation table, wherein the grayscale data voltage compensation table stores mapping relationship between voltages of common electrodes (VCOM) VCOM shift amplitudes and grayscale data voltage compensation values;
• a calculator, which is configured to calculate a VCOM shift amplitude corresponding to a row of sub-pixels on the display panel based on grayscale data voltages of a frame of image to be displayed;
• a compensation value acquirer, which is coupled to the compensation table acquirer and the calculator and configured to obtain a grayscale data voltage compensation value corresponding to the row of sub-pixels on the display panel based on the calculated VCOM shift amplitude and the grayscale data voltage compensation table;
• a compensator, which is coupled to the compensation value acquirer and configured to compensate the grayscale data voltages actually inputted to the row of sub-pixels based on the grayscale data voltage compensation value to obtain compensated grayscale data voltages;
• and
• a grayscale data voltage outputer, which is coupled to the compensator and configured to output the compensated grayscale data voltages to the row of sub-pixels during display time of the frame of image to be displayed;
• wherein the display driving apparatus further comprises a compensation table checker, the compensation table checker comprises:
• an initial acquirer, configured to acquire an initial grayscale data voltage compensation table, wherein the initial grayscale data voltage compensation table stores mapping relationship between initial VCOM shift amplitudes and initial grayscale data voltage compensation values;
• an initial compensator, coupled to the initial acquirer and configured to provide initial grayscale data voltages to a row of sub-pixels on a display panel so that the VCOM shift amplitude corresponding to the row of the sub-pixels is an initial VCOM shift amplitude corresponding to the row of the sub-pixels, to compensate the grayscale data voltages actually inputted to the row of the sub-pixels based on the initial grayscale data voltage compensation value corresponding to the initial VCOM shift amplitude to obtain the initial compensated grayscale data voltages;
• and to output the initial compensated grayscale data voltages to the row of the sub-pixels;
• and
• a compensation table detector, respectively coupled to the initial acquirer and the compensation table acquirer, and configured to measure actual brightness values of the row of sub-pixels and to adjust the initial compensated grayscale data voltages based on a difference between the actual brightness values and preset brightness values of the row of sub-pixels to obtain the grayscale data voltage compensation value corresponding to the initial VCOM shift amplitude, thereby obtaining the grayscale data voltage compensation table;
• wherein the preset brightness values are theoretical values of brightness of the plurality of sub-pixels when the initial grayscale data voltages are provided to the row of the sub-pixels.