Display device and method of driving the same
In each horizontal period, by switching ON switches respectively provided for three data signal lines for R, G and B in a group at the same time only in a predetermined period, the data signal lines in the group are preliminary charged to a predetermined potential at the same time before a data signal supply period. In a subsequent data signal supply period, respective switches of data signal lines for R, G and B are switched ON sequentially, to sequentially supply respective data for R, G and B to pixels on a scanning signal line as selected are supplied via data signal lines. As a result, in a display device driven by time-division based on a group of sequentially provided data signal lines, it is possible to suppress up-throw potential fluctuations when display.
1. A display device comprising:
a plurality of data signal lines divided into a plurality of groups, each group being made up of sequentially provided data signal lines;
a plurality of scanning signal lines;
a data output circuit for outputting data signals to the plurality of data signal lines;
a plurality of pixels, provided respectively at intersections of said plurality of data signal lines and said plurality of scanning signal lines; and
a plurality of switches provided for each group of data signal lines, wherein respective data output sides of said plurality of switches are connected to respective ends on one side of said plurality of data signal lines, and respective data input sides of said plurality of switches are mutually connected to the data output circuit, and said plurality of switches output the data signals to each group of data signal lines by time-division in each horizontal scanning period and turn ON respective groups of data signal lines at the same time to simultaneously output the data signals, wherein
a polarity of each of the data signals is inverted for each frame, and
the data output circuit charges the data signal lines in each group to a predetermined potential only in a vertical blank period, and
the switches are conducted also in a period in which the data output circuit charges the data signal lines.
2. The display device as set forth in claim 1 , wherein:
each group of said plurality of groups is made up of three data signal lines respectively corresponding to three primary colors which constitute a display color.
3. The display device as set forth in claim 1 , wherein:
each group of said plurality of groups is made up of two adjacent data signal lines.
4. The display device as set forth in claim 1 , wherein:
said predetermined potential is an AC potential which can take at least two potential values.
5. The display device as set forth in claim 1 , wherein:
said predetermined potential is substantially an average value between a maximum potential value and a minimum potential value of a data signal to be supplied to the data signal line.
6. The display device as set forth in claim 1 , wherein:
a data signal to be supplied to the data signal line is subjected to a polarity inversion; and
said predetermined potential is substantially an average potential value between a maximum positive-polarity potential value and a minimum positive-polarity potential value of the data signal, and substantially an average potential value between a maximum negative-polarity potential value and a minimum negative-polarity potential value of the data signal.
7. The display device as set forth in claim 1 , wherein:
a voltage to be applied to an element provided in each pixel by a charged voltage of the data signal line is a potential difference between the predetermined potential and a reference potential, and the predetermined potential is set as a potential that maximizes the voltage to be applied to the element, and is apart from the reference potential in a predetermined range of potential to be applied to said data signal line in each data signal supply period.
8. A display device comprising:
a plurality of data signal lines divided into a plurality of groups, each group being made up of sequentially provided data signal lines;
a plurality of scanning signal lines;
a plurality of pixels, provided respectively at intersections of said plurality of data signal lines and said plurality of scanning signal lines;
a plurality of switches, provided for each group of data signal lines, whose respective data output sides are connected to respective ends on one side of said plurality of data signal lines, and whose respective data input sides are mutually connected, wherein said plurality of switches output data signals to each group of data signal lines by time-division in each horizontal scanning period and turn ON respective groups of data signal lines at the same time to simultaneously output data signals;
a potential line to which a predetermined potential is to be applied; and
an auxiliary switch for connecting each data signal line to said potential line only in a vertical blank period, wherein
a polarity of each of the data signals is inverted for each frame.
9. The display device as set forth in claim 8 , wherein:
said predetermined potential is an AC potential which can take at least two potential values.
10. The display device as set forth in claim 8 , wherein:
said predetermined potential is substantially an average value between a maximum potential value and a minimum potential value of a data signal to be supplied to the data signal line.
11. The display device as set forth in claim 8 , wherein:
a data signal to be supplied to the data signal line is subjected to a polarity inversion; and
said predetermined potential is substantially an average potential value between a maximum positive-polarity potential value and a minimum positive-polarity potential value of the data signal, and substantially an average potential value between a maximum negative-polarity potential value and a minimum negative-polarity potential value of the data signal.
12. The display device as set forth in claim 8 , wherein:
a voltage to be applied to an element provided in each pixel by a charged voltage of the data signal line is a potential difference between the predetermined potential and a reference potential, and the predetermined potential is to be set up a potential that maximizes the voltage to be applied to the element, which is a potential most apart from the reference potential in a predetermined range of potential to be applied to said data signal line in each data signal supply period.
13. A method of driving a display device, which comprises a plurality of data signal lines divided into a plurality of groups, each group being made up of sequentially provided data signal lines, a data output circuit for outputting data signals to the plurality of data signal lines; and a plurality of pixels, provided respectively at intersections of said plurality of data signal lines and a plurality of scanning signal lines, data signal lines in each group are driven by time-division via a common wiring provided on a data signal supply side, said method comprising:
a first step for outputting a data signal to data signal lines in each group in a data signal supply period of the group, and a plurality of switches output data signals to each group of data signal lines by time-division in each horizontal scanning period and turn ON respective groups of data signal lines at the same time to simultaneously output the data signals, wherein
a polarity of each of the data signals is inverted for each frame; and
a second step for charging data signal lines in the group to a predetermined potential only in a vertical blank period, and the switches are conducted also in a period in which the data output circuit charges the data signal lines.
14. The method of driving a display device as set forth in claim 13 , wherein:
each group of said plurality of groups is made up of three data signal lines respectively corresponding to three primary colors which constitute a display color.
15. The method of driving a display device as set forth in claim 13 , wherein:
each group of said plurality of groups is made up of two adjacent data signal lines.
16. The method of driving a display device as set forth in claim 13 , wherein:
said predetermined potential is an AC potential which can take at least two potential values.
17. The method of driving a display device as set forth in claim 13 , wherein:
said predetermined potential is substantially an average value between a maximum potential value and a minimum potential value of a data signal to be supplied to the data signal line.
18. The method of driving a display device as set forth in claim 13 , wherein:
a data signal to be supplied to the data signal line is subjected to a polarity inversion; and
said predetermined potential is substantially an average potential value between a maximum positive-polarity potential value and a minimum positive-polarity potential value of the data signal, and substantially an average potential value between a maximum negative-polarity potential value and a minimum negative-polarity potential value of the data signal.
19. The method of driving a display device as set forth in claim 13 , wherein:
a voltage to be applied to an element provided in each pixel by a charged voltage of the data signal line is a potential difference between the predetermined potential and a reference potential, and the predetermined potential is to be set up a potential that maximizes the voltage to be applied to the element, which is a potential most apart from the reference potential in a predetermined range of potential to be applied to said data signal line in each data signal supply period.