Patent ID: 8547368
Filing Date: 2013-10-01
Classification: G09G,G11C

Abstract:
1. A display driving circuit for driving a display panel which includes scan signal lines, data signal lines, pixel electrodes, switching elements, and capacity coupling lines, wherein the scan signal lines turn on and off the switching elements corresponding thereto, and each of the switching elements has (i) one terminal connected with one of the respective pixel electrodes and (ii) another terminal connected with one of the respective data signal lines, and the capacity coupling lines are capacity-coupled with corresponding ones of the pixel electrodes, wherein each of the scan signal lines forms a row together with switching elements connected thereto, pixel electrodes respectively connected to these switching elements, and one of the capacity coupling lines capacity-coupled with these pixel electrodes, the display driving circuit driving the display panel to carry out a gradation display in accordance with electric potentials of the pixel electrodes, the display driving circuit comprising: a scan signal line driving circuit for driving the scan signal lines; a data signal line driving circuit for outputting a data signal which is based on a video signal; and a capacity coupling line driving circuit for outputting a potential shift signal whose electric potential is switched over in accordance with a polarity of the data signal, for each row, the capacity coupling line driving circuit outputting a potential shift signal to a row in accordance with an output signal outputted to the row from the scan signal line driving circuit, wherein: the capacity coupling line driving circuit outputs the potential shift signal after at least a single horizontal scan period has passed from when the output signal is outputted from the scan signal line driving circuit, the capacity coupling line driving circuit includes a transfer circuit for securing at least a single horizontal period between when the output signal is outputted from the scan signal line driving circuit and when the potential shift signal is outputted, the capacity coupling line driving circuit includes: the memory circuit includes a first transistor having (i) a first electrode which receives a first input signal and (ii) a control electrode which receives the output signal outputted from the scan signal line driving circuit, a first capacitor element provided between a second electrode of the first transistor and a reference power supply line through which a reference voltage is supplied, a second transistor having (i) a first electrode which receives a second input signal and (ii) a control electrode connected to the control electrode of the first transistor, and a second capacitor element provided between a second electrode of the second transistor and the reference power supply line through which the reference voltage is supplied; the transfer circuit includes a third transistor having (i) a first electrode connected to the second electrode of the first transistor and (ii) a control electrode which receives a clock signal, and a fourth transistor having (i) a first electrode connected to the second electrode of the second transistor and (ii) a control electrode which receives the clock signal; and the switch circuit includes a fifth transistor having (i) a control electrode connected to a second electrode of the third transistor, (ii) a first electrode connected to an output terminal, and (iii) a second electrode which receives a first power supply voltage, and a sixth transistor having (i) a control electrode connected to a second electrode of the fourth transistor, (ii) a first electrode connected to the output terminal, and (iii) a second electrode which receives a second power supply voltage.