Patent ID: 8576156
Filing Date: 2013-11-05
Classification: C09K,G09G

Abstract:
1. A liquid crystal display device comprising: a liquid crystal display panel including a display region, the display region including: (i) picture elements each of which is made up of a plurality of sub-picture elements; and (ii) active elements provided respectively to the sub-picture elements; a scanning line driving circuit that supplies scan signals to scanning lines provided in the display region; and a signal line driving circuit that supplies data signals to signal lines provided in the display region, the sub-picture elements having respective auxiliary capacitor elements, the auxiliary capacitor elements being connected respectively to different auxiliary capacitor lines, the auxiliary capacitor elements being driven in accordance with auxiliary capacitor driving signals supplied respectively to the auxiliary capacitor lines, so that the sub-picture elements provide displays of mutually different luminances, wherein an auxiliary capacitor line driving circuit, provided in a surrounding region located around the display region in the liquid crystal display panel, which generates the auxiliary capacitor driving signals is such that: a first voltage trunk line is connected to the auxiliary capacitor lines via first N-type semiconductor elements, a second voltage trunk line, which supplies a voltage that is different from a voltage supplied to the first voltage trunk line, is connected to the auxiliary capacitor lines via second N-type semiconductor elements, any one of at least two control signals being identical in switching period and being out of phase with each other so as not to rise simultaneously is supplied to the first N-type semiconductor elements, another control signal of the at least two control signals, that is not the control signal supplied to the first N-type semiconductor elements, is supplied to the second N-type semiconductor elements, a voltage at the rise of the at least two control signals is set to be higher than any voltages supplied to the first and second voltage trunk lines, a voltage at the fall of the at least two control signals is set to be lower than any voltages supplied to the first and second voltage trunk lines, when the control signal supplied to the first N-type semiconductor elements is rising, the first N-type semiconductor elements allow the first voltage trunk line and the auxiliary capacitor lines to be electrically conductive, when the control signal supplied to the second N-type semiconductor elements is rising, the second N-type semiconductor elements allow the second voltage trunk line and the auxiliary capacitor lines to be electrically conductive, in a case where the voltage supplied to the first voltage trunk line is set to be higher than the voltage supplied to the second voltage trunk line, a control signal line which carries the control signal to the first N-type semiconductor elements is connected via capacitors to the auxiliary capacitor lines connected to the first N-type semiconductor elements, and in a case where the voltage supplied to the second voltage trunk line is set to be higher than the voltage supplied to the first voltage trunk line, a control signal line which carries the control signal to the second N-type semiconductor elements is connected via capacitors to the auxiliary capacitor lines connected to the second N-type semiconductor elements.