Active matrix type liquid crystal display device and drive method thereof

摘要

An active matrix type liquid crystal display device may include a black signal insertion device to apply a voltage corresponding to a black display as a voltage for data signal lines only during a black signal insertion period that is a part of one frame period, a black insertion ratio change device to change the insertion period, and an unchanged-storage-capacitor-phase-keeping device to control the insertion period after the change. The control makes a time difference the same, before and after the change, between (i) a timing, among timings at which signal voltages of the first or second storage capacitor line rise, at which a storage capacitor voltage rises that is both prior to a start timing of the insertion period and a closest timing to the start timing of the insertion period, and (ii) the start timing of the insertion period.

主权项

1. An active matrix type liquid crystal display device including: scanning signal lines; data signal lines; a pixel at each intersection of the scanning signal lines and the data signal lines, the pixel including a plurality of sub-pixels; a first storage capacitor line forming a first capacitor between the first storage capacitor line and a first sub-pixel electrode in at least one of the plurality of sub-pixels; and a second storage capacitor line forming a second capacitor between the second storage capacitor line and a second sub-pixel electrode in at least another one of the plurality of sub-pixels, to which first storage capacitor line and second storage capacitor line signal voltages of phases opposite to each other are periodically applied, respectively, the active matrix type liquid crystal display device comprising:
a black signal insertion device to apply a voltage corresponding to a black display as a voltage for each of the data signal lines as a black insertion pulse at a start timing of a black signal insertion period that is a part of one frame period; a black insertion ratio change device to change a total length of the black signal insertion period by changing a timing of the black insertion pulse; and an unchanged-storage-capacitor-phase-keeping device to control the black signal insertion period, so that a time difference, before the change of the black signal insertion period, between:
(i) a timing, among timings at which signal voltages of the first or second storage capacitor line rise, at which a storage capacitor voltage rises that is both prior to the start timing of the black signal insertion period and a closest timing to the start timing of the black signal insertion period, and(ii) the start timing of the black signal insertion period; becomes the same as the time difference, after the change of the black signal insertion period, between:
(iii) the timing, among the timings at which the signal voltages of the first or second storage capacitor line rise, at which the storage capacitor voltage rises that is both prior to the start timing of the black signal insertion period and the closest timing to the start timing of the black signal insertion period, and(iv) the start timing of the black signal insertion period; wherein the unchanged-storage-capacitor-phase-keeping device controls the black signal insertion period after the change of the black signal insertion period so that a time difference between (a) the timing at which the storage capacitor voltage rises and (b) a timing at which the black insertion pulse rises, the black insertion pulse being applied first to each of the scanning signal lines during the black signal insertion period, becomes the same before and after the change of the black signal insertion period.