LCD drive circuit and driving method for scanning at least two adjacent scan lines simultaneously
View Patent ↗A liquid crystal display (LCD) drive circuit and a driving method thereof are disclosed. The driving method comprises: a. dividing scan lines into a plurality of groups each comprising a plurality of scan lines; b. during displaying of a current image frame, using a scan driver to scan each group of scan lines sequentially, c. during displaying of a next image frame, using the scan driver to scan each group of scan lines sequentially; and d. if each scan line in the group has been scanned once simultaneously with an adjacent scan line within a predetermined time interval, then the step b is executed; otherwise, the step c is executed. The LCD drive circuit and the driving method thereof according to the present disclosure can increase an average charging time of pixel units without compromising the accuracy of image frames.
1. A liquid crystal display (LCD) drive circuit for scanning at least two adjacent scan lines simultaneously, comprising:
a data driver, a scan driver, a divider, a controller, a plurality of data lines and a plurality of scan lines; wherein
the scan driver is connected to the plurality of scan lines;
the data driver is connected to the plurality of data lines;
the divider is configured to divide the scan lines into a plurality of groups each comprising a plurality of scan lines; and
the controller is configured to control the scan driver to scan the plurality of groups of scan lines sequentially, wherein the scan driver is controlled to scan at least two adjacent scan lines in each group simultaneously, and scan the remainder of the each group of scan lines sequentially including the last scan line of the at least two adjacent scan lines scanned simultaneously;
the controller is further configured to control the scan driver such that the at least two adjacent scan lines scanned simultaneously within a predetermined time interval are different for different image frames, and positions of the at least two adjacent scan lines scanned simultaneously of each group in a current image frame are different from positions of the at least two adjacent scan lines scanned simultaneously of each group in a next image frame following the current image frame, the positions of the at least two adjacent scan lines scanned simultaneously of each group in the next image frame are shifted downwards from those in the current image frame by a number of the at least two adjacent scan lines scanned simultaneously of each group, wherein the predetermined time interval is in units of image frame durations, and a magnitude of the predetermined time interval is equal to the number of scan lines in each group divided by the number of scan lines scanned simultaneously.
2. The LCD drive circuit of claim 1 , wherein:
the divider is configured to divide the scan lines into a plurality of groups each comprising eight scan lines, and the controller is configured to control the scan driver to, during scanning of each group of scan lines, scan two adjacent scan lines in the group simultaneously and also control the scan driver in such a way that every two adjacent scan lines scanned simultaneously in four consecutive image frames is different from each other.
3. The LCD drive circuit of claim 2 , wherein:
the controller is configured to control the scan driver in such a way that, within the four consecutive frames, positions of the two adjacent scan lines scanned simultaneously in each of the image frames are shifted downwards by two scan lines from those of a previous image frame.
4. The LCD drive circuit of claim 1 , wherein:
the at least two adjacent scan lines scanned simultaneously of a previous group is spaced from the at least two adjacent scan lines scanned simultaneously of a group located next to the previous group with a predetermined number of scan lines, and the predetermined number of scan lines is equal to the number of the remainder scan lines in the each group.
5. An LCD (liquid crystal display) driving method for scanning at least two adjacent scan lines simultaneously, comprising the following steps of:
a. dividing scan lines into a plurality of groups, each group comprising a plurality of scan lines;
b. during displaying of a current image frame, using a scan driver to scan the plurality of groups of scan lines sequentially, wherein for each group of scan lines, the scan driver is controlled by a controller to scan at least two adjacent scan lines in the each group simultaneously, and scan the remainder of the each group of scan lines sequentially including the last scan line of the at least two adjacent scan lines scanned simultaneously;
c. during displaying of a next image frame, using the scan driver to scan the plurality of groups of scan lines sequentially, wherein for each group of scan lines, the controller controls the scan driver such that positions of the at least two adjacent scan lines scanned simultaneously of each group in the current image frame are different from positions of the at least two adjacent scan lines scanned simultaneously of each group in the next image frame following the current image frame, the positions of the at least two adjacent scan lines scanned simultaneously in the next image frame are shifted downwards from those in the current image frame by a number of the at least two adjacent scan lines scanned simultaneously; and
d. executing the step b and the step c repeatedly until all available image frames are displayed, wherein the predetermined time interval is in units of image frame durations, and a magnitude of the predetermined time interval is equal to the number of scan lines in each group divided by the number of scan lines scanned simultaneously.
6. The LCD driving method of claim 5 , wherein:
in the step c and the step d, the controller controls the scan driver in such a way that positions of the scan lines scanned simultaneously are shifted downwards by at least two scan lines from those scanned simultaneously in the previous image frame, and if the last scan line of the scan lines scanned simultaneously is the last one in the group, then the step d is executed; otherwise, if the last scan line of the scan lines scanned simultaneously is not the last one in the group, then the step c is executed.
7. The LCD driving method of claim 6 , wherein:
in the step b, the controller controls the scan driver to scan a first scan line and a second scan line in the group simultaneously and scan other scan lines in the group sequentially; and
in the step c, the controller controls the scan driver in such a way that positions of the scan lines scanned simultaneously are shifted downwards by two scan lines from the previous image frame.
8. The LCD driving method of claim 5 , wherein:
in the step a, the scan lines are divided into a plurality of groups, each group comprising eight scan lines.
9. The LCD driving method of claim 5 , wherein:
in the step b, the at least two adjacent scan lines scanned simultaneously of a previous group is spaced from the at least two adjacent scan lines scanned simultaneously of a group located next to the previous group with a predetermined number of scan lines, and the predetermined number of scan lines is equal to the number of the remainder scan lines in the each group.