Driving method for pixel array and display device
The present invention provides a driving method for pixel array, comprising steps of: dividing a to-be-displayed image into multiple theoretical pixel units; calculating an actual brightness value of each actual sub-pixel; and enabling brightness of each actual sub-pixel to reach the actual brightness value. The step of calculating an actual brightness value of each actual sub-pixel comprises: finding a first theoretical sub-pixel; inserting multiple virtual sub-pixels having the same color as the first theoretical sub-pixel between the first theoretical sub-pixel and at least one adjacent theoretical sub-pixel; and adding a portion of the theoretical brightness value of the first theoretical sub-pixel and a portion of virtual brightness value(s) of virtual sub-pixel(s) whose position(s) corresponds to that of the to-be-calculated actual sub-pixel to obtain the actual brightness value of the to-be-calculated actual sub-pixel. The present invention further provides a display device to which the above driving method is applicable.
1. A driving method for a pixel array, wherein the pixel array comprises a plurality of actual pixel units, each of which comprises a plurality of actual sub-pixels having different colors, a horizontal-to-vertical ratio of each actual sub-pixel is in the range of 1:2 to 1:1, and the driving method comprises steps of:
dividing an image to be displayed into a plurality of theoretical pixel units, each of which comprises a plurality of theoretical sub-pixels having different colors, and calculating a theoretical brightness value of each theoretical sub-pixel;
calculating an actual brightness value of each actual sub-pixel; and
inputting a signal to each actual sub-pixel so that brightness of each actual sub-pixel reaches the calculated actual brightness value,
wherein, the step of calculating an actual brightness value of each actual sub-pixel comprises sub-steps of:
finding, in the image to be displayed, a first theoretical sub-pixel whose position in the image to be displayed corresponds to position of the actual sub-pixel to be calculated in the pixel array;
inserting at least one virtual sub-pixel having the same color as the first theoretical sub-pixel between the first theoretical sub-pixel and at least one adjacent theoretical sub-pixel, wherein the adjacent theoretical sub-pixel is a theoretical sub-pixel adjacent to the first theoretical sub-pixel among all theoretical sub-pixels having the same color and in the same row as the first theoretical sub-pixel; and
obtaining, as the actual brightness value of the actual sub-pixel to be calculated, a weighted sum of the theoretical brightness value of the first theoretical sub-pixel and an virtual brightness value of the virtual sub-pixel whose position corresponds to that of the actual sub-pixel to be calculated, wherein the virtual brightness value of the virtual sub-pixel is a weighted sum of the theoretical brightness value of the first theoretical sub-pixel and the theoretical brightness value of corresponding adjacent theoretical sub-pixel.
2. The driving method according to claim 1 , wherein, the virtual sub-pixel is inserted between the first theoretical sub-pixel and the adjacent theoretical sub-pixel arranged at a side of the first theoretical sub-pixel.
3. The driving method according to claim 2 , wherein, when the first theoretical sub-pixel has two adjacent theoretical sub-pixels, virtual sub-pixels are inserted between the first theoretical sub-pixel and the adjacent theoretical sub-pixels arranged at both sides of the first theoretical sub-pixel.
4. The driving method according to claim 3 , wherein, the virtual brightness value of the virtual sub-pixel is calculated according to the following formula:
V ni =a i T 1 +b i T 2 , wherein,
i=1, . . . , n;
n is the number of the virtual sub-pixel inserted between the first theoretical sub-pixel and one adjacent theoretical sub-pixel;
V ni is the virtual brightness value of the i-th virtual sub-pixel among the n virtual sub-pixels;
a i +b i =1, a i , b i >0, when i<n/2, a i >b i , when i>n/2, a i <b i , when i=n/2, a i =b i ;
T 1 is the theoretical brightness value of the theoretical sub-pixel on the left side of the virtual sub-pixel to be calculated; and
T 2 is the theoretical brightness value of the theoretical sub-pixel on the right side of the virtual sub-pixel to be calculated.
5. The driving method according to claim 4 , wherein,
when n=1, V 11 =½(T1+T2); and
when n>1, V n1 =½*(T 1 +V (n-1)1 ), V ni =½*(V (n-1)(i-1) +V (n-1)i ) (1<i<n), and V nn =½*(T2+V (n-1)(n-1) ).
6. The driving method according to claim 4 , wherein, n is any one of 1 to 5.
7. The driving method according to claim 2 , wherein, the virtual brightness value of the virtual sub-pixel is calculated according to the following formula:
V ni =a i T 1 +b i T 2 , wherein,
i=1, . . . , n;
n is the number of the virtual sub-pixel inserted between the first theoretical sub-pixel and one adjacent theoretical sub-pixel;
V ni is the virtual brightness value of the i-th virtual sub-pixel among the n virtual sub-pixels;
a i +b i =1, a i , b i >0, when i<n/2, a i >b i , when i>n/2, a i <b i , when i=n/2, a i =b i ;
T 1 is the theoretical brightness value of the theoretical sub-pixel on the left side of the virtual sub-pixel to be calculated; and
T 2 is the theoretical brightness value of the theoretical sub-pixel on the right side of the virtual sub-pixel to be calculated.
8. The driving method according to claim 7 , wherein,
when n=1, V 11 =½(T1+T2); and
when n>1, V n1 =½*(T 1 +V (n-1)1 ), V ni =½*(V (n-1)(i-1) +V (n-1)i ) (1<i<n), and V nn =½*(T2+V (n-1)(n-1) ).
9. The driving method according to claim 7 , wherein, n is any one of 1 to 5.
10. The driving method according to claim 1 , wherein, length of the theoretical sub-pixel in a longitudinal direction is equal to that of the actual sub-pixel in a longitudinal direction, and the horizontal-to-vertical ratio of each actual sub-pixel is 1:2 or 1:1.
11. The driving method according to claim 1 , wherein, each actual pixel unit comprises three actual sub-pixels having colors different from each other, and the horizontal-to-vertical ratio of each actual sub-pixel is 2:3.
12. The driving method according to claim 11 , wherein, the pixel array comprises a plurality of pixel unit sets, each of which comprises two adjacent actual pixel units in a same column, and left boundaries of the actual sub-pixels of the actual pixel unit in a lower row are aligned with midpoints of bottom boundaries of the actual sub-pixels of the actual pixel unit in an upper row.
13. The driving method according to claim 11 , wherein, the pixel array comprises a plurality of pixel unit sets, each of which comprises two adjacent actual pixel units in a same column, and left boundaries of the actual sub-pixels of the actual pixel unit in an upper row are aligned with midpoints of top boundaries of the actual sub-pixels of the actual pixel unit in a lower row.