DRIVING METHOD FOR DISPLAY PANEL, TIMING CONTROLLER AND LIQUID CRYSTAL DISPLAY

• US 20180268769A1
• Filed: 04/20/2017
• Published: 09/20/2018
• Est. Priority Date: 03/20/2017
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: WU, Yu, WANG, Lei
• Granted Patent: US 10,192,506 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/0613 The adjustment depending on the type of the information to be displayed
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/045 Protection against panel overheating
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

The present invention provides a driving method for a display panel, a timing controller and a liquid crystal display. The method includes: when detecting that an image frame to be displayed is an overloaded image, a timing controller switches an operation frequency from a first frequency to a second frequency; outputting a timing control signal to a source driver with the second frequency such that after the source driver receives the timing control signal, the source driver outputs the data driving signal having a lower frequency to drive the display panel to display the overloaded image; wherein the first frequency is higher than the second frequency. Through the above way, the output power consumption of the source driver when displaying an overloaded image is decreased, and avoid rising temperature to affect the display quality.

Claims

1. A liquid crystal display, comprising:

a timing controller for outputting a timing control signal;

a display driving circuit including a source driver and a gate driver for receiving the timing control signal, wherein the source driver generates a data driving signal according to the timing control signal, and the gate driver generates a scanning driving signal; and

a liquid crystal display panel including multiple data lines, multiple scanning lines and multiple pixel units, wherein the scanning line receives the scanning driving signal and the data line receives the data driving signal in order to control a corresponding pixel unit to display;

wherein, the timing controller comprises;

a control circuit for outputting a first frequency switching instruction when an image frame to be displayed is detected as an overloaded image;

a signal generation circuit connected with the control circuit for switching an operation frequency from a first frequency to a second frequency in a switching moment of adjacent frames according to the first frequency switching instruction, and using the second frequency to output the timing control signal to the source driver such that after the source driver receives the timing control signal, the source driver outputs the data driving signal having a lower frequency to drive the display panel to display the overloaded image;

the control circuit is further used for outputting a second frequency switching instruction when an image frame to be displayed is detected as a non-overloaded image;

the signal generation circuit is further used for switching the operation frequency from the second frequency to the first frequency according to the second frequency switching instruction, and using the first frequency to output the timing control signal to the source driver such that after the source driver receives the timing control signal, the source driver outputs corresponding data driving signal to drive the display panel to display the non-overloaded image;

wherein, the first frequency is higher than the second frequency; and

wherein the overloaded image is defined as when the timing controller adopts the first frequency as the operation frequency to control the source driver to display an image frame to be displayed, the power consumption of the source driver exceeds a preset power consumption value, and the image frame to be displayed is an overloaded image.

2. The liquid crystal display according to claim 1, wherein, the signal generation circuit is used for switching the operation frequency from the second frequency to the first frequency in a switching moment of adjacent frames.

3. The liquid crystal display according to claim 1, wherein, the second frequency is one half of the first frequency.

4. The liquid crystal display according to claim 1, wherein, the liquid crystal display panel includes an array substrate, a color filter substrate and liquid crystals clamped between the array substrate and the color filter substrate, and the multiple data lines, the multiple scanning lines and the multiple pixel units are disposed on the array substrate.

5. A driving method for display panel, comprising:

when detecting that an image frame to be displayed is an overloaded image, a timing controller switches an operation frequency from a first frequency to a second frequency; and

the timing controller outputs a timing control signal to a source driver with the second frequency such that after the source driver receives the timing control signal, the source driver outputs the data driving signal having a lower frequency to drive the display panel to display the overloaded image;

wherein, the first frequency is higher than the second frequency; and

wherein the overloaded image is defined as when the timing controller adopts the first frequency as the operation frequency to control the source driver to display an image frame to be displayed, the power consumption of the source driver exceeds a preset power consumption value, and the image frame to be displayed is an overloaded image.

6. The driving method according to claim 5, wherein, the step of a timing controller switching an operation frequency from a first frequency to a second frequency comprises:

the timing controller switches the operation frequency from the first frequency to the second frequency in a switching moment of adjacent frames.

7. The driving method according to claim 5, wherein, after the step of the timing controller outputting a timing control signal to a source driver with the second frequency, the method further comprises:

when detecting that an image frame to be displayed is a non-overloaded image, the timing controller switches the operation frequency from the second frequency to the first frequency; and

the timing controller uses the first frequency to output the timing control signal to the source driver such that after the source driver receives the timing control signal, the source driver outputs corresponding data driving signal to drive the display panel to display the non-overloaded image.

8. The driving method according to claim 7, wherein, the step of the timing controller switching the operation frequency from the second frequency to the first frequency comprises:

the timing controller switches the operation frequency from the second frequency to the first frequency in a switching moment of adjacent frames.

9. The driving method according to claim 5, wherein, the second frequency is one half of the first frequency.

10. A timing controller of a display panel, comprising:

a control circuit for outputting a first frequency switching instruction when an image frame to be displayed is detected as an overloaded image;

a signal generation circuit connected with the control circuit for switching an operation frequency from a first frequency to a second frequency according to the first frequency switching instruction, and using the second frequency to output the timing control signal to the source driver such that after the source driver receives the timing control signal, the source driver outputs the data driving signal having a lower frequency to drive the display panel to display the overloaded image;

wherein, the first frequency is higher than the second frequency; and

wherein the overloaded image is defined as when the timing controller adopts the first frequency as the operation frequency to control the source driver to display an image frame to be displayed, the power consumption of the source driver exceeds a preset power consumption value, and the image frame to be displayed is an overloaded image.

11. The timing controller according to claim 10, wherein, the signal generation circuit switches the operation frequency from the first frequency to the second frequency in a switching moment of adjacent frames.

12. The timing controller according to claim 10, wherein, the signal generation circuit is further used for switching the operation frequency from the second frequency to the first frequency according to the second frequency switching instruction, and using the first frequency to output the timing control signal to the source driver such that after the source driver receives the timing control signal, the source driver outputs corresponding data driving signal to drive the display panel to display the non-overloaded image.

13. The timing controller according to claim 12, wherein, the signal generation circuit is used for switching the operation frequency from the second frequency to the first frequency in a switching moment of adjacent frames.

14. The timing controller according to claim 10, wherein, the second frequency is one half of the first frequency.