Display devices and driving method therefor
View Patent ↗Driving schemes are described in which rows (1 to m) are selected one at a time and column data voltages are inverted to provide inversion schemes for display devices comprising pixels ( 12 ) arranged in rows (1 to m) and columns (1 to n). The order in which rows are selected is such that a first group of first polarity rows is selected in a first order, a first group of second polarity rows is selected in a second order, a second group of first polarity rows is selected in the second order, and a second group of second polarity rows is selected in the first order, the first order being one of ascending or descending row number order, and the second order being the other of ascending or descending row number order.
1. A method of driving an array of pixels ( 12 ) arranged in rows (1 to m) and columns (1 to n); the method comprising:
selecting the rows (1 to m) of pixels ( 12 ) one row at a time; and
applying respective data voltages to the columns (1 to n) of pixels ( 12 ) each time a row is selected, the polarity of the data voltage applied to a given column being inverted between a first polarity and a second polarity such that positionally successive rows are driven with a different polarity of data voltage;
selecting the rows (1 to m) of pixels ( 12 ) one row at a time comprising the following steps performed in the following order:
(i) successively selecting, in a first order, the rows of a first group of first polarity rows being positionally successive rows of those rows being driven with the first polarity;
(ii) successively selecting, in a second order, the rows of a first group of second polarity rows being positionally successive rows of those rows being driven with the second polarity, the rows of the first group of first polarity rows and the rows of the first group of second polarity rows being positionally interlaced such that together they are a plurality of positionally successive rows;
(iii) successively selecting, in the second order, the rows of a second group of first polarity rows being positionally successive rows of those rows being driven with the first polarity; and
(iv) successively selecting, in the first order, the rows of a second group of second polarity rows being positionally successive rows of those rows being driven with the second polarity, the rows of the second group of first polarity rows and the rows of the second group of second polarity rows being positionally interlaced such that together they are a plurality of positionally successive rows which positionally succeeds the plurality of positionally successive rows of, together, the first group of first polarity rows and the first group of second polarity rows;
wherein the first order is one of ascending or descending row number order, and the second order is the other of ascending or descending row number order.
2. A method according to claim 1 , wherein each group of first polarity rows or second polarity rows comprises three or more rows.
3. A method according to claim 1 , wherein the pixels ( 12 ) are pixels of an active matrix liquid crystal display.
4. Display driver apparatus for driving an array of pixels ( 12 ) arranged in rows (1 to m) and columns (1 to n), comprising:
means for selecting the rows (1 to m) of pixels ( 12 ) one row at a time; and
means for applying respective data voltages to the columns (1 to n) of pixels ( 12 ) each time a row is selected, the polarity of the data voltage applied to a given column being inverted between a first polarity and a second polarity such that positionally successive rows are driven with a different polarity of data voltage;
the means for selecting the rows (1 to m) of pixels ( 12 ) one row at a time being adapted to perform selection of the rows (1 to m) by implementing the following steps in the following order:
(i) successively selecting, in a first order, the rows of a first group of first polarity rows being positionally successive rows of those rows being driven with the first polarity;
(ii) successively selecting, in a second order, the rows of a first group of second polarity rows being positionally successive rows of those rows being driven with the second polarity, the rows of the first group of first polarity rows and the rows of the first group of second polarity rows being positionally interlaced such that together they are a plurality of positionally successive rows;
(iii) successively selecting, in the second order, the rows of a second group of first polarity rows being positionally successive rows of those rows being driven with the first polarity; and
(iv) successively selecting, in the first order, the rows of a second group of second polarity rows being positionally successive rows of those rows being driven with the second polarity, the rows of the second group of first polarity rows and the rows of the second group of second polarity rows being positionally interlaced such that together they are a plurality of positionally successive rows which positionally succeeds the plurality of positionally successive rows of, together, the first group of first polarity rows and the first group of second polarity rows;
wherein the first order is one of ascending or descending row number order, and the second order is the other of ascending or descending row number order.
5. Display driver apparatus according to claim 4 , wherein each group of first polarity rows or second polarity rows comprises three or more rows.
6. A display device comprising an array of pixels ( 12 ) arranged in rows (1 to m) and columns (1 to n), and display driver apparatus according to claim 4 .
7. A method of driving an array of pixels ( 12 ) arranged in rows (1 to m) and columns (1 to n); the method comprising:
selecting the rows (1 to m) of pixels ( 12 ) one row at a time; and
applying respective data voltages to the columns (1 to n) of pixels ( 12 ) each time a row is selected, the polarity of the data voltage applied to a given column being inverted between a first polarity and a second polarity such that positionally successive rows are driven with a different polarity of data voltage;
selecting the rows (1 to m) of pixels ( 12 ) one row at a time comprising the following steps performed in the following order:
(i) successively selecting, in a first order, the rows of a first group of three or more first polarity rows being positionally successive rows of those rows being driven with the first polarity; and
(ii) successively selecting, in a second order, the rows of a first group of three or more second polarity rows being positionally successive rows of those rows being driven with the second polarity, the rows of the first group of first polarity rows and the rows of the first group of second polarity rows being positionally interlaced such that together they are a plurality of positionally successive rows;
wherein the first order is one of ascending or descending row number order, and the second order is the other of ascending or descending row number order.
8. A method according to claim 7 , wherein the pixels ( 12 ) are pixels of an active matrix liquid crystal display.
9. Display driver apparatus for driving an array of pixels ( 12 ) arranged in rows (1 to m) and columns (1 to n), comprising:
means for selecting the rows (1 to m) of pixels ( 12 ) one row at a time; and
means for applying respective data voltages to the columns (1 to n) of pixels ( 12 ) each time a row is selected, the polarity of the data voltage applied to a given column being inverted between a first polarity and a second polarity such that positionally successive rows are driven with a different polarity of data voltage;
the means for selecting the rows (1 to m) of pixels ( 12 ) one row at a time being adapted to perform selection of the rows (1 to m) by implementing the following steps in the following order:
(i) successively selecting, in a first order, the rows of a first group of three or more first polarity rows being positionally successive rows of those rows being driven with the first polarity; and
(ii) successively selecting, in a second order, the rows of a first group of three or more second polarity rows being positionally successive rows of those rows being driven with the second polarity, the rows of the first group of first polarity rows and the rows of the first group of second polarity rows being positionally interlaced such that together they are a plurality of positionally successive rows;
wherein the first order is one of ascending or descending row number order, and the second order is the other of ascending or descending row number order.
10. A display device comprising an array of pixels ( 12 ) arranged in rows (1 to m) and columns (1 to n), and display driver apparatus according to claim 9 .