Display panel driving and scanning method and system
A display panel driving and scanning system includes a timing controller to divide one frame period into first to third time periods. In the first time period, an image processing device calculates an overdriving signal for a current frame based on the current frame and a previous frame. In the second time period, the image processing device outputs the current frame, and a source driver charges the capacitors of the pixels in the liquid crystal display panel based on the current frame. In the third time period, the timing controller drives a backlight driving circuit to turn on a backlight source of the liquid crystal display panel for displaying the current frame.
1. A display panel driving and scanning system, which is used in a liquid crystal display (LCD) panel to drive pixels of the LCD panel for displaying an image, the LCD panel having a plurality of scan lines arranged in rows, a plurality of source lines arranged in columns across the scan lines, and a plurality of pixels each arranged at an intersection of the scan lines and the source lines, the display panel and scanning system comprising:
a scan driver, connected to the LCD panel through the scan lines, for providing a scan driving signal to the LCD panel;
a source driver, connected to the LCD panel through the source lines, for providing an image display signal to the LCD panel;
an image processing device, connected to the source driver, for storing a previous frame and receiving a current frame, so as to calculate an overdriving signal for the current frame based on the previous frame and the current frame, and
a timing controller, for controlling the scan driver, the source driver, and the image processing device to display the current frame on the LCD panel,
wherein the image processing device outputs the overdriving signal and the current frame respectively for charging the plurality of pixels in one frame period, and the frame period is divided into a first time period, a second time period, and a third time period, such that the image processing device outputs the overdriving signal in the first time period for charging the plurality of pixels, stops outputting the overdriving signal and outputs the current frame in the second time period for charging the plurality of pixels based on the current frame, and stops outputting the current frame in the third time period;
wherein the image processing device comprises:
a first storage device for temporarily storing the current frame;
a second storage device, connected to the first storage device, for receiving the current frame in a previous frame period and temporarily storing it as the previous frame;
an overdriving signal calculator, connected to the first storage device and the second storage device, for calculating the overdriving signal for the current frame based on the current frame stored in the first device and the previous frame stored in the second storage device; and
a multiplexer, connected to the first storage device, the second storage device, and the timing controller, for outputting the overdriving signal and the current frame according to an input signal from the timing controller.
2. The display panel driving and scanning system as claimed in claim 1 , wherein the third time period has a length determined by subtracting the first time period and the second time period from the frame period.
3. The display panel driving and scanning system as claimed in claim 2 , further comprising a backlight driving circuit, connected to the timing controller and the LCD panel, for driving a backlight source of the LCD panel by the timing controller.
4. The display panel driving and scanning system as claimed in claim 3 , wherein the timing controller in the third time period controls the backlight driving circuit to drive the backlight source of the LCD panel for displaying the current frame.
5. The display panel driving and scanning system as claimed in claim 1 , wherein in the first time period, the first storage device outputs a pixel of the current frame and the second storage device outputs pixel of the previous frame at a corresponding position to the pixel of the current frame, such that the overdriving signal calculator calculates the overdriving signal at the corresponding position according to the pixel of the current frame and the pixel of the previous frame.
6. The display panel driving and scanning system as claimed in claim 5 , wherein the timing controller configures the multiplexer to output the overdriving signal in the first time period.