Display driving circuit, display device and display driving method

摘要

An embodiment of the present invention switches, in a display driving circuit of a liquid crystal display device which carries out CC driving, between a two-line reversal driving mode in which a polarity of a data signal supplied to a source line is reversed every two horizontal scanning periods and a one-line reversal driving mode in which a polarity of a data signal supplied to a source line is reversed every one horizontal scanning period. In at least one example embodiment, a polarity signal reverses its polarity every two horizontal scanning periods in the two-line reversal driving mode, and reverses its polarity every one horizontal scanning period in the one-line reversal driving mode.

主权项

1. A display driving circuit for use in a display device in which by supplying a retention capacitor wire signal to a retention capacitor wire forming a capacitor with a pixel electrode included in a pixel, a signal potential written into the pixel electrode from a data signal line is changed according to a change in potential of the retention capacitor wire signal, the signal potential written into the pixel electrode is one of decreased if the polarity of the signal potential is negative and increased if the polarity of the signal potential is positive,
said display driving circuit switching between a first mode in which a polarity of a signal potential supplied to the data signal line is reversed every n horizontal scanning period(s) (n is an integer) and a second mode in which a polarity of a signal potential supplied to the data signal line is reversed every m horizontal scanning period(s) (m is an integer other than n), in the first mode, a direction of change of the signal potential written into the pixel electrode from the data signal line is caused to vary every n adjacent row(s), the varying every n adjacent row(s) including switching between increasing and decreasing the signal potential according to change in potential of the retention capacitor wire signal, and in the second mode, a direction of change of the signal potential written into the pixel electrode from the data signal line is caused to vary every m adjacent row(s), the varying every m adjacent row(s) including switching between increasing and decreasing the signal potential according to a change in potential of the retention capacitor wire signal, the display driving circuit comprising: a shift register including a plurality of stages provided in such a way as to correspond to a plurality of scanning signal lines, respectively; retaining circuits being provided in such a way as to correspond one-by-one to the stages of the shift register, respectively, a retention target signal being inputted to each of the retaining circuits, an output signal from a current stage and an output signal from a subsequent stage that is later than the current stage are inputted to a logic circuit corresponding to the current stage, the output of the logic circuit being inputted to the retaining circuit corresponding to the current stage, when an output from the logic circuit becomes active, a retaining circuit corresponding to the current stage loading and retaining the retention target signal, the output signal from the current stage being supplied to a scanning signal line connected to a pixel corresponding to the current stage, and an output from the retaining circuit corresponding to the current stage being supplied as the retention capacitor wire signal to a retention capacitor wire that forms a capacitor with a pixel electrode of the pixel corresponding to the current stage, and a phase of the retention target signal inputted to said each of the retaining circuits being set according to the first mode or the second mode.