Liquid crystal display device
View Patent ↗A liquid crystal display device includes liquid crystal pixels, signal line groups each including a predetermined number of signal lines, and a drive circuit which selects the pixels on a row-by-row basis and drives the pixels of the selected row via the signal lines. The drive circuit includes a signal line driver which outputs a predetermined number of pixel voltages for each group driving period while the pixels of each row are being selected, a multiplexer which distributes to each signal line group the pixel voltages output from the signal line driver, and a controller which controls the multiplexer to electrically connect all of the signal line groups to the signal line driver and electrically disconnect the signal line groups one by one from the signal line driver for each group driving period, in a selection period of the pixels of an initial row that requires polarity inversion.
1. A liquid crystal display device comprising:
a plurality of liquid crystal pixels which are arrayed substantially in a matrix;
a plurality of signal line groups each including a predetermined number of signal lines which are arranged along the columns of liquid crystal pixels; and
a drive circuit which selects the liquid crystal pixels on a row-by-row basis and drives the liquid crystal pixels of the selected row via the signal lines;
wherein the drive circuit includes:
a signal line driver which outputs a predetermined number of pixel voltages, which are assigned to the predetermined number of signal lines included in each of the signal line groups, in a parallel fashion for each group driving period while the liquid crystal pixels of each row are being selected;
a multiplexer which distributes to each of the signal line groups the predetermined number of pixel voltages output from the signal line driver in the cycle of group driving period; and
a controller which controls, in a case where output voltage polarities of the signal line driver are to be inverted in units of a predetermined number of pixel rows, the multiplexer to electrically connect all of the signal line groups to the signal line driver and electrically disconnect the signal line groups one by one from the signal line driver in a sequential fashion for each group driving period in a selection period of the liquid crystal pixels of an initial row that requires polarity inversion.
2. The liquid crystal display device according to claim 1 , wherein the signal line driver includes a predetermined number of output terminals, which is equal to a fraction of an integer of 2 or more with respect to a total number of the signal lines, and the multiplexer includes a plurality of analog switches which supply, when all the signal line groups are to be connected to the signal line driver, the predetermined number of pixel voltages simultaneously output from the predetermined number of output terminals, to at least two of the signal lines, which correspond to the columns of the liquid crystal pixels which are to be driven with an identical polarity.
3. The liquid crystal display device according to claim 2 , wherein the predetermined number of output terminals are output buffers having output voltage polarities each of which is opposite to that of a neighboring one of the output terminals.
4. The liquid crystal display device according to claim 3 , wherein the output voltage polarities of the predetermined number of output buffers are inverted in units of any one of two pixel rows, three pixel rows, four pixel rows and five pixel rows.
5. The liquid crystal display device according to claim 1 , wherein the signal line driver includes a predetermined number of output terminals, which is equal to a fraction of an integer of 2 or more with respect to a total number of the signal lines, and the multiplexer includes a plurality of analog switches which apply, when all the signal line groups are to be connected to the signal line driver, the predetermined number of pixel voltages output from the predetermined number of output terminals, to at least two of the signal lines for the columns of liquid crystal pixels of a same color to be driven in a same polarity.
6. The liquid crystal display device according to claim 5 , wherein the predetermined number of output terminals are output buffers having output voltage polarities each of which is opposite to that of a neighboring one of the output terminals.
7. The liquid crystal display device according to claim 6 , wherein the output voltage polarities of the predetermined number of output buffers are inverted in units of any one of two pixel rows, three pixel rows, four pixel rows and five pixel rows.