The present application is based on, and claims priority from, Taiwan Application Serial Number 95101639, filed Jan. 16, 2006, the disclosure of which is hereby incorporated by reference herein in its entirety.
1. Field of Invention The present invention relates to an active display apparatus. More particularly, the present invention relates to a method and system for driving a display apparatus.
2. Description of Related Art
Progress in the development of flat panel displays (FPD) has led to a shift from conventional cathode-ray tube (CRT) displays to liquid crystal displays (LCD) because they occupy less volume, are lighter, emit lower radiation and have lower power consumption. Nowadays, LCD panels are used commercially in consumer products, such as personal digital assistants (PDA), mobile phones, cameras, laptops and televisions.
The data driver circuit 104, the gate driver groups 106a-106d and the backlight driver groups 110a-110d are controlled by a driver control circuit 112. In the scan-backlight control mode, the driver control circuit 112 controls the gate driver groups 106a-106d and the data driver circuit 104 to respectively scan and drive the display blocks 102a-102d in a fixed sequence from the display block 102a to the display block 102d. At the same time, the driver control circuit 112 controls the backlight driver groups 110a-110d to turn on the backlight blocks 108a-108d in the sequence used to drive the display blocks 102a-102d for displaying a complete frame of image.
The response time of the liquid crystal in LCD displays is significant so that a charging period during which the voltage across the liquid crystal raises to a desired level can not be ignored. When the backlight block corresponding to the display block is turned on within the charging period, an undesired image is displayed. Therefore, the backlight block should be turned on only after the charging period of the display block is finished.
According to the foregoing principle,
Consequently, each of the backlight blocks 108a -108d is only turned on for half of one frame period so that the brightness resulting from the previously described backlight control mode is half of that resulting from a backlight system constantly turning on the backlight.
In general, the problem of brightness loss can be alleviated by increasing the brightness of the backlight module, but it will increase power consumption and degrade the life time of the backlight module.
It is therefore an objective of the present invention to provide a method and system for driving a display.
It is another objective of the present invention to provide a method and system for driving the display blocks in different sequences for different frames.
It is still another objective of the present invention to provide a method and system for enhancing the brightness of the image displayed on a display apparatus.
It is still another objective of the present invention to provide a method and system for enhancing the quality of a dynamic image displayed on a display apparatus.
According to one preferred embodiment, a method for driving a display apparatus having a plurality of display blocks is provided. The display blocks are driven in a first sequence during a first frame period, and the display blocks are driven in a second sequence during a second frame period immediately following the first frame period. The display block driven last in the first sequence is driven first in the second sequence, and an order of each of the other display blocks in the second sequence is higher than that in the first sequence by one.
According to another preferred embodiment, a method for controlling a backlight module having at least one backlight block is provided. The backlight block is turned on during a first turning-on period within a first frame period. The backlight block is turned on during a second turning-on period within a second frame period immediately following the first frame period. The first turning-on period within the first frame period is one other than a counterpart of the second turning-on period within the second frame period.
According to another preferred embodiment, a system for driving a display apparatus having a plurality of display blocks is provided. The system comprises a sequence generating module, a gate driving control module and a data driving control module. The sequence generating module determines a first and second sequence. The gate driving control module controls a plurality of gate driver groups of the display apparatus to scan the display blocks according to the first and second sequence. The data driving control module controls a data driver circuit of the display apparatus to drive the display blocks scanned by the gate driver groups. The display blocks are driven in the first sequence during a first frame period and driven in the second sequence during a second frame period immediately following the first frame period, the display block driven last in the first sequence is driven first in the second sequence, and an order of each of the other display blocks in the second sequence is higher than that in the first sequence by one.
According to another preferred embodiment, a display apparatus comprises a pixel array, a plurality of gate driver groups, a data driver circuit and a control circuit. The pixel array comprises a plurality of display blocks. The gate driver groups scan the display blocks. The data driver circuit drives the display blocks scanned by the gate driver groups.
The control circuit comprises a sequence generating module, a gate driving control module and a data driving control module. The sequence generating module outputs a first and second sequence. The gate driving control module controls a plurality of gate driver groups of the display apparatus to scan the display blocks according to the first and second sequence. The data driving control module used to control a data driver circuit to drive the display blocks scanned by the gate driver groups. The display blocks are driven in the first sequence during a first frame period and driven in the second sequence during a second frame period immediately following the first frame period, the display block driven last in the first sequence is driven first in the second sequence, and an order of each of the other display blocks in the second sequence is higher than that in the first sequence by one
According to another preferred embodiment, a method for driving a display apparatus having a plurality of display blocks is provided. the display blocks are driven in a first sequence during a first frame period. The display blocks are driven in a second sequence during a second frame period immediately following the first frame period, and the first sequence is different from the second sequence.
These and other features, aspects and advantages of the present invention will become better understood with regard to the following description, appended claims and accompanying drawings, where:
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
In this embodiment, the driving sequence of the display blocks changes between any two adjacent frames. The display block driven last during a first frame is driven first in the following second frame, and an order of each of the other display blocks in the driving sequence during the first frame is higher than that during the second frame by one. Accordingly, the turning-on period of each backlight block during the first frame period is not a counterpart of that during the second frame period. For example, during the frame period from the clock cycle to the clock cycle 8, the backlight block 108a is turned on in the clock cycles 5 and 8. However, during the next frame period from the clock cycle 9 to the clock cycle 12, the backlight block 108a is turned on in the clock cycles 9 and 10 which are not counterparts of the clock cycles 5 and 8.
Additionally, the brightness resulting from the previously described turning-on sequence could be higher than that resulting from the conventional backlight control mode. It is noted that, during the first and second frame period (the clock cycles 1 to 8), the backlight block 108a corresponding to the display block 102a is turned on from the beginning of the clock cycle 3 to the end of the clock cycle 5. The backlight block 108a is turned off at the beginning of the clock cycle 6 when the display block 102a is driven for the second frame. Thus, in comparison with the conventional turning-on sequence shown in
In the previously described embodiment, the number of the display blocks and the length of the frame period are only exemplary and not limited to 4 and 4 clock cycles.
The system 500 further includes a backlight driving control module 508 controlling backlight driver groups 110a-110d to turn on and off the backlight blocks 108a-108d in response to the charging periods of the display blocks 102a-102d. For example, during the frame period from the clock cycles 5-8, the backlight block 108a corresponding to the display block 102a, the charging period of which starts from the beginning of the clock cycle 6 and finishes at the end of the clock cycle 7, is turned on in the clock cycles 5 and 8, and turned off in the clock cycles 6 and 7. Similarly, the backlight blocks 108b, 108c and 108d are turned on and off in response to the charging periods of the display clocks 102b, 102c and 102d.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
Number | Date | Country | Kind |
---|---|---|---|
95101639 | Jan 2006 | TW | national |