CN116343711A - Display device and picture burn-in preventing method thereof - Google Patents

Abstract

A display device includes: a display panel and a display controller. The display controller is used for receiving video signals from the host and playing the video signals on the display panel. A display controller calculates a picture average brightness of each image in the video signal. When the absolute difference between the average brightness of the first frame of the current image and the average brightness of the second frame of the previous image in the video signal is less than a predetermined value, the display controller starts a timer to obtain a timing value. When the timing value reaches the first period, the display controller reduces the brightness of each pixel of the current image by a first ratio. When the timing value reaches the second period, the display controller reduces the brightness of each pixel of the current image by a second ratio, wherein the second period is greater than the first period, and the second ratio is greater than the first ratio.

Description

Display device and its screen anti-burn-in method

technical field

The present invention relates to a display device, in particular to a display device and a screen anti-burning method thereof.

Background technique

Due to advances in technology, computer users spend more and more time using monitors every day. Because in some applications, the host will play a static image on the display panel with high brightness for a long time, it is easy to cause aging of the pixel elements of the display panel, thus causing image burn-in, especially for organic light emitting diode (OLED) panels.

Contents of the invention

In view of this, the present invention provides a display device and its image anti-burn-in method to solve the above problems.

The invention provides a display device, including: a display panel and a display controller. The display controller is used for receiving a video signal from a host and playing the video signal on the display panel. The display controller calculates the frame average brightness of each image in the video signal. When the absolute difference between the average brightness of the first frame of the current image and the average brightness of the second frame of the previous image in the video signal is less than a predetermined value, the display controller starts a timer to obtain a timing value. When the timing value reaches a first period, the display controller reduces the brightness of each pixel of the current image of the video signal played on the display panel by a first ratio. When the timing value reaches a second period, the display controller reduces the brightness of each pixel of the current image of the video signal played on the display panel by a second ratio, wherein the second period is greater than the first period, and The second ratio is greater than the first ratio.

In some embodiments, when the timing value is greater than or equal to a third period, the display controller reduces the brightness of each pixel of the video signal played on the display panel to 0, wherein the third period is greater than the second time period.

In some embodiments, the display controller calculates the average value of the red subpixel, green subpixel, and blue subpixel of each pixel in each image in the video image, and calculates the average value of all pixels in each image value sum, and then divide the average sum by the resolution of the display panel to obtain the picture average brightness of each image.

In some embodiments, when the absolute difference is less than the predetermined value, the display controller determines that the current image and the previous image are substantially the same. When the absolute difference is greater than or equal to the predetermined value, the display controller judges that the current image and the previous image are different images, and resets the timer value of the timer.

In some embodiments, the display controller dynamically adjusts the predetermined value according to the average brightness of the current image. When the screen average brightness of the current image is in the first brightness interval, the display controller sets the predetermined value as a first predetermined value. When the average brightness of the frame of the current image is in the second brightness interval, the display controller sets the predetermined value as a second predetermined value. When the frame average brightness of the current image is in the third brightness range, the display controller sets the predetermined value as a third predetermined value. The first brightness range is higher than the second brightness range, and the second brightness range is higher than the third brightness range. The first predetermined value is greater than the second predetermined value, and the second predetermined value is greater than the third predetermined value.

The present invention further provides an anti-burn-in method for a display device, wherein the display device includes a display panel and a display controller. The method includes: using the display controller to receive a video signal from a host, and playing the video signal on the display panel; using the display controller to calculate the average brightness of each image in the video signal; when the video When the absolute difference between the average brightness of the first frame of the current image and the average brightness of the second frame of the previous image in the signal is less than a predetermined value, the display controller is used to start a timer to obtain a timing value; when the timing value reaches During the first period, using the display controller to reduce the brightness of each pixel of the current image of the video signal played on the display panel by a first ratio; and when the timing value reaches the second period, using the display controller The brightness of each pixel of the current image of the video signal played on the display panel is reduced by a second ratio, wherein the second period is greater than the first period, and the second ratio is greater than the first ratio.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

FIG. 1 is a block diagram of a computer system according to an embodiment of the invention.

2A-2D are schematic diagrams of reducing screen brightness according to an embodiment of the present invention.

FIG. 3 is a flow chart of a screen anti-burn-in method according to an embodiment of the invention.

Among them, reference signs:

10:Computer system

21-24: Image

100: Host

110: processing unit

111: system bus

120: Graphics processing unit

130: memory unit

140: storage device

141: Application

142: operating system

150: Transmission interface

160: peripheral device

200: display device

201: Time work column

210: display controller

211:Image resizer

212: Timing controller

220: display panel

230: storage unit

231, 232: firmware

233: The interface is displayed on the screen

240: image buffer

250: Transmission interface

260: input interface

261:Physical button

262: Five-way joystick

S310～S360: Steps

Detailed ways

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

FIG. 1 is a block diagram of a computer system according to an embodiment of the invention. The computer system 10 may be, for example, a personal computer or a server equipped with a display device. As shown in FIG. 1 , the computer system 10 includes a host 100 and a display device 200 , wherein the host 100 is signal-connected to the display device 200 . The host 100 includes, for example, a processing unit 110 , a graphics processing unit 120 , a memory unit 130 , a storage device 140 , one or more transmission interfaces 150 , and one or more peripheral devices 160 . The processing unit 110 , the graphics processing unit 120 , the memory unit 130 , the storage device 140 , the transmission interface 150 , and the peripheral device 160 are coupled to each other through the system bus 111 . The processing unit 110 can be, for example, a central processing unit (CPU), a general-purpose processor, etc., but the invention is not limited thereto. The graphics processing unit 120 can be, for example, a graphics processing unit on a display card or a graphics processing unit integrated into the processing unit 110 .

The memory unit 130 is a random access memory, such as dynamic random access memory (DRAM) or static random access memory (SRAM), but the invention is not limited thereto. The storage device 140 is a non-volatile memory (non-volatile memory), such as a hard disk drive (hard disk drive), a solid-state disk (solid-state disk), a flash memory (flash memory), or read-only memory (read-only memory), but the present invention is not limited thereto.

The transmission interface 150 may include a wired transmission interface and/or a wireless transmission interface, wherein the wired transmission interface may include: a high-resolution multimedia interface (High Definition Multimedia Interface, HDMI), a display port (DisplayPort, DP) interface, an embedded display port ( embedded DisplayPort (eDP) interface, Universal Serial Bus (USB) interface, USB Type-C interface, Thunderbolt (Thunderbolt) interface, digital video interface (DVI), video graphics array (VGA) interface, universal input Output (GPIO) interface, Universal Asynchronous Receiver Transmitter (UART) interface, Serial Peripheral Interface (SPI) interface, Integrated Circuit Bus (I2C) interface, or a combination thereof, and the wireless transmission interface may include: Bluetooth (Bluetooth), WiFi, Near Field Communication (NFC) interface, etc., but the present invention is not limited thereto. The peripheral device 160 includes, for example, input devices such as a keyboard, a mouse, and a touch pad, but the present invention is not limited thereto.

For example, the storage device 140 can store one or more application programs 141 and an operating system 142 (such as Windows, Linux, MacOS, etc.), and the processing unit 110 can store one or more application programs 141 and the operating system 142 Read to memory unit 130 and execute. The graphics processing unit 120 can, for example, perform drawing processing of the application program executed by the processing unit 110 to generate a video signal including one or more images, and transmit the video signal through the transmission interfaces 150 and 250 (such as an HDMI interface or a DisplayPort interface). to the display controller 210 of the display device 200 .

The display device 200 can be, for example, a flat panel display, a television, a projector, a computer screen, etc., but the present invention is not limited thereto. The display device 200 includes a display controller 210 , a display panel 220 , a storage unit 230 , an image buffer 240 , one or more transmission interfaces 250 , and an input interface 260 .

The transmission interface 250 may include a wired transmission interface and/or a wireless transmission interface, wherein the wired transmission interface may include: a high-resolution multimedia interface (High Definition Multimedia Interface, HDMI), a display port (DisplayPort, DP) interface, an embedded display port ( embedded DisplayPort, eDP), Universal Serial Bus (Universal Serial Bus, USB) interface, USB Type-C interface, Thunderbolt (Thunderbolt) interface, digital video interface (DVI), video graphics array (VGA) interface, general-purpose input and output (GPIO) interface, Universal Asynchronous Receiver Transmitter (UART) interface, Serial Peripheral Interface (SPI) interface, Integrated Circuit Bus (I2C) interface, or a combination thereof, and the wireless transmission interface may include: Bluetooth (Bluetooth), WiFi , Near Field Communication (NFC) interface, etc., but the present invention is not limited thereto.

The display controller 210 can be, for example, an application-specific integrated circuit, a system-on-chip, a processor, or a microcontroller, but the present invention is not limited thereto .

The display panel 220 can be, for example, a liquid crystal (liquid crystal) panel (including a backlight module), a light-emitting diode (light-emitting diode) panel or an organic light-emitting diode (organic light-emitting diode) panel, but the present invention is not limited thereto .

The storage unit 230 can be, for example, a non-volatile memory, such as a read-only memory (ROM), an erasable programmable read-only memory (EPROM), and an electrically erasable programmable read-only memory (EEPROM). The storage unit 230 is used for storing firmware 231 and 232 related to the display device 200 and one or more on-screen-display (OSD) interfaces 233 . The storage unit 230 can be external to the display controller 210 , or can be integrated into the display controller 210 , for example.

The firmware 231 includes, for example, display settings, extended display capability identification data (Extended Display Identification Data, EDID) and display settings of the on-screen display interface of the display device 200 . The extended display capability identification data includes, for example, the manufacturer of the display device 200 , product name, resolution, display frames per second, and so on. The display settings include, for example, settings of brightness, contrast, sharpness, color temperature, etc. of the display device 200 . The firmware 232 includes, for example, related instructions or program codes of the anti-burn-in function of the display device 200 .

In one embodiment, the display controller 210 can read the program codes of the firmware 231-232 and the OSD interface 233 stored in the storage unit 230 through a bus (such as the I2C bus), and set related display parameters accordingly. , and enable the anti-burn-in function of the display device 200 . In addition, the display controller 210 can also transmit the identification data of the extended display capability of the display device 200 to the host 100 through one of the transmission interfaces 250 (for example, an image transmission channel or a data transmission channel) for the host 100. The processing unit 110 and the graphics processing unit 120 set the resolution of the video signal to be output and the related synchronization signal. The OSD interface 233 includes, for example, an on-screen display menu (OSD Menu) and options, an information display interface (information dashboard), a timer, a counter, a crosshair, a specific symbol, a specific color, a specific text, or a combination thereof, but the present invention It is not limited to this.

The image buffer 240 can be, for example, a volatile memory (such as a dynamic random access memory) or a non-volatile memory (such as a flash memory), which is used to store the output image to be played on the display panel 220, wherein the host 100 Or the display controller 210 can cover a specific area of the current image of the video signal stored in the image buffer 240 with one or more on-screen display interfaces 233 according to an on-screen display enable signal generated by the host 100 to generate an output image.

The input interface 260 is used for controlling the menu displayed on the screen of the display device 200 . The input interface 260 can be implemented, for example, by a five-way joystick 262 or by five physical buttons 261, so as to realize commands such as up, down, left, right, and confirmation.

In one embodiment, when the user operates one direction of the five-way joystick 262 (or presses one of the physical buttons 261), the display controller 210 can read the firmware 231 from the storage unit 230 and display on the screen. The program codes of the menu and related options are displayed on the screen in the interface 233, and the menu and related options are displayed on the display panel 220. In one embodiment, the user can operate on the input interface 260 to control the display device The menu is displayed on the screen of 200, and then adjust the brightness, contrast, sharpness, color temperature of the display panel 220, or open or close other interfaces in the display interface 233 on the screen. In another embodiment, the user can The peripheral device 160 operates to control the on-screen display menu of the display device 200, thereby adjusting the brightness, contrast, sharpness, color temperature of the display panel 220, or turning on or off other interfaces in the on-screen display interface 233, the details of which will be described in detail later.

For example, the firmware 231 can be regarded as the default firmware of the display device 200, and the user can control the option setting of the on-screen display interface 233 displayed on the display device 200 via the five-way joystick 262 (or the physical button 261). Certainly.

In one embodiment, the display controller 210 includes an image scaler (image scaler) 211 and a timing controller (timing controller) 212 . The display controller 210 receives image signals from the host 100 and/or image signals from other hosts through one of the transmission interfaces 250, and the image scaler 211 can perform image scaling processing on images in the received image signals and and/or image superposition processing to meet the resolution of the display panel 220 , and store the image after the image scaling process (for example, referred to as an output image) into the image buffer 240 . The timing controller 212 controls the display panel 220 to read the output image from the image buffer 240 and play it.

In another embodiment, the display controller 210 may include a timing controller 212, and the resolution of the video signal from the host 100 conforms to the resolution of the display panel 220, so after the display controller 210 receives the video signal from the host 100 The video signal can be stored in the image buffer 240 without image scaling processing. The timing controller 220 can read the output image from the image buffer 240 and control the display panel 220 to play the output image.

2A-2D are schematic diagrams of reducing screen brightness according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2A-FIG. 2D at the same time.

In one embodiment, the display controller 210 can calculate the number of pixels changed between the current image (such as time point N) and the previous image (such as time point N-1) of the video signal, for example, the current image (such as time point N-1) When the absolute value of the brightness difference of the specific pixel at the same position in N) and the previous image (such as time point N−1) is greater than 0 (or greater than a predetermined value), the display controller 210 determines that the specific pixel has changed. In some embodiments, the brightness difference of the specific pixel is the difference of the gray level of the specific pixel. In some other embodiments, the brightness difference of the specific pixel is the sum of the difference values of the red sub-pixel, the green sub-pixel and the blue sub-pixel in the specific pixel, but the present invention is not limited thereto.

For example, as shown in FIG. 2A, when the video signal transmitted from the host computer 100 to the display device 200 includes an image 21, such as a static image, and the image 21 includes a time column 201, and the current time is 3:15 p.m. . In addition, the host 100 regularly updates the time displayed in the time work column 201 , for example, once every minute. Therefore, at 3:16 pm, the video signal transmitted from the host 100 to the display device 200 includes the image 22 , as shown in FIG. 2B .

Assuming that the display panel 220 plays 60 frames per second, the image 21 will last for one minute (ie 60 frames), and the image 22 will also last for one minute (60 frames). The display controller 210 then calculates the picture average brightness Y of each image in the video signal, as shown in formula (1):

Wherein M is the resolution of the display panel 220; K represents a single pixel; Z represents the average brightness of the red sub-pixel, the green sub-pixel and the blue sub-pixel in the single pixel. For example, if the resolution of the display panel 220 is 1920x1080, then M=1920x1080=2073600 pixels. If the brightness of the red sub-pixel, the green sub-pixel and the blue sub-pixel in a single pixel are represented by BR, BG and BB respectively, then Z=(BR+BG+BB)/3.

The display controller 210 then calculates the average frame brightness YN and YN-1 of the current image (time point N) and the previous image (time point N-1), and calculates the absolute difference A between the frame average brightness YN and YN-1, where The absolute difference A can be expressed by formula (2):

A＝|Y _N -Y _N-1 | (2)

When the above-mentioned absolute difference A is between 0 and a predetermined value TH (for example, 1, not limited), it represents the average brightness YN and YN- of the current image (time point N) and the previous image (time point N-1) 1 is very close, so the display controller 210 will determine that the current image (time point N) and the previous image (time point N−1) are two images that are substantially the same. At this time, if the timer (not shown in FIG. 1 ) is not started, the display controller 210 starts the timer to count the duration of the static image. If the timer has been started, the display controller 210 will continue to accumulate the timing value of the timer.

It should be noted that if the above-mentioned absolute difference A is greater than or equal to the predetermined value TH, it means that the average brightness YN and YN-1 of the current image (time point N) and the previous image (time point N-1) have produced relatively low Therefore, the display controller 210 determines that the current image (time point N) and the previous image (time point N−1) are different images, and resets the timer value. In this embodiment, the display controller 210 uses a fixed predetermined value TH to determine whether the current image and the previous image are substantially the same image.

Because the image 21 in FIG. 2A and the image 22 in FIG. 2B are all static images, and the difference between the image 21 and the image 22 is only the time displayed by the time work bar 201, so the display controller 210 judges the current image and the previous image The mechanism of whether the images are substantially the same already includes a tolerance value to allow small changes in the screen, such as time jumps on the time work bar 201, or blinking positioning cursors on a text editor.

In detail, when the counting value of the timer reaches the first period, it means that the video signal played on the display device 200 has maintained a static image for a period of time, so the display controller 210 activates the anti-burn-in mechanism of the display device 200, and The brightness of each pixel of the current image of the video signal played on the display panel 220 is reduced by a first ratio, wherein the first time is, for example, 5 minutes and the first ratio is, for example, 50%, but the present invention is not limited thereto. For example, image 22 in FIG. 2B is maintained as a static image starting at 3:16 pm. When it is 3:21 in the afternoon, the display controller 210 will judge that the timing value of the timer has reached the first period (for example, 5 minutes), so the display controller 210 will display each image of the current image of the video signal played on the display panel 220 The brightness of the pixel is reduced by 50%, as shown in Figure 2C.

Next, because the video signal from the host computer 100 still maintains a static image, when the countdown value of the timer reaches the second period (for example, 10 minutes), it means that the video signal played on the display device 200 has continued to maintain a static image. For a long time, the display controller 210 will reduce the brightness of each pixel of the current image of the video signal played on the display panel 220 by a second ratio, wherein the second period is, for example, 10 minutes and the second ratio is, for example, 70%. But the present invention is not limited thereto. For example, image 22 in FIG. 2B is maintained as a static image starting at 3:16 pm. When it is 3:26 in the afternoon, the display controller 210 will judge that the timing value of the timer has reached the second period (for example, 10 minutes), so the display controller 210 will display each image of the current image of the video signal played on the display panel 220 The brightness of the pixel is reduced by 70%, as shown in Figure 2D.

Because the video signal from the host computer 100 still maintains a static image, when the countdown value of the timer reaches the third period (for example, 15 minutes), it means that the video signal played on the display device 200 has continued to maintain a static image for a long time. time, the display controller 210 reduces the brightness of each pixel of the current image of the video signal played on the display panel 220 to 0 (for example, a black screen is displayed), wherein the third period of time is, for example, 15 minutes, but the present invention does not limited to this. In addition, the display controller 210 can read the OSD interface 233 corresponding to the prompt message from the firmware 231 at this time, and play the prompt message on the display panel 220 to remind the user that the display device 200 has entered the screen anti-burn-in mode.

In another embodiment, the display controller 210 dynamically adjusts the predetermined value TH according to the average brightness of the current frame of the video signal, and then determines whether the current image and the previous image are substantially the same image. For example, when the average brightness of the current image of the video signal is between 100% and 70% (for example, the first brightness range) of the highest brightness of each pixel (for example, 255), the display controller 210 sets the above predetermined value to TH is set to a predetermined value TH1, wherein the predetermined value TH1 is, for example, 0.5/10,000 (that is, 0.00005), which means that when the average brightness of the current image is at a relatively high brightness, the display controller 210 can set a lower predetermined value TH1 (tolerance ratio) to determine whether the current image and the previous image are substantially the same image.

When the screen average brightness of the current image of the video signal is between 70% and 30% (for example, the second brightness interval) of the highest brightness of each pixel (for example, 255), the display controller 210 sets the above-mentioned predetermined value TH to The predetermined value TH2, wherein the predetermined value TH2 is, for example, 1/10,000 (ie 0.0001), which means that when the average brightness of the current image is at a medium brightness, the display controller 210 can set a moderate predetermined value TH2 (tolerance ratio) to judge Whether the current image and the previous image are substantially the same image.

When the average brightness of the current image of the video signal is between 30% and 10% (for example, the third brightness range) of the highest brightness of each pixel (for example, 255), the display controller 210 sets the above-mentioned predetermined value TH to Predetermined value TH3, wherein the predetermined value TH3 is, for example, 2/10,000 (ie 0.0002), which means that when the average brightness of the current image is low, the display controller 210 can set a higher predetermined value TH3 (tolerance ratio) to judge It is judged whether the current image and the previous image are substantially the same image.

FIG. 3 is a flow chart of a screen anti-burn-in method according to an embodiment of the invention. Please refer to Figure 1 and Figure 3 at the same time.

In step S310 , the display controller 210 receives a video signal from the host 100 and plays the video signal on the display panel 220 .

In step S320, the display controller 210 calculates the screen average brightness of each image in the video signal. For example, the display controller 210 can calculate the average value Z of the red sub-pixel, green sub-pixel and blue sub-pixel of each pixel in each image in the video signal, and calculate the average value Z of all pixels in each image value sum, and then divide the average sum by the resolution of the display panel 220 (that is, the total number of pixels) to obtain the average screen brightness Y of each image, as shown in formula (1).

In step S330, when the absolute difference between the average brightness of the first frame of the current image and the average brightness of the second frame of the previous image in the video signal is less than a predetermined value, the display controller 210 starts a timer to obtain a timing value. For example, the average brightness of the current image (time point N) and the previous image (time point N-1) are YN and YN-1 respectively, and the total pair difference A is shown in formula (2). When the above-mentioned absolute difference A is between 0 and a predetermined value TH (for example, 1, not limited), it represents the average brightness YN and YN- of the current image (time point N) and the previous image (time point N-1) 1 is very close, so the display controller 210 will determine that the current image (time point N) and the previous image (time point N−1) are two images that are substantially the same.

In step S340 , when the timer value reaches the first period, the display controller 210 reduces the brightness of each pixel of the current image of the video signal played on the display panel 220 by a first ratio.

In step S350, when the timer value reaches the second time period, the display controller 210 reduces the brightness of each pixel of the current image of the video signal played on the display panel 220 by a second ratio, wherein the second time period is greater than the first time period, and the second time period is greater than the first time period. The second ratio is greater than the first ratio.

In step S360, when the timer value reaches a third period, the display controller 210 reduces the brightness of each pixel of the current image of the video signal played on the display panel 220 to 0, wherein the third period is greater than the second period. For example, when the above-mentioned absolute difference A is between 0 and a predetermined value TH (for example, 1, not limited), it represents the average brightness of the current image (time point N) and the previous image (time point N-1) YN and YN-1 are very close, so the display controller 210 determines that the current image (time point N) and the previous image (time point N-1) are two images that are substantially the same. At this time, if the timer (not shown in FIG. 1 ) is not started, the display controller 210 starts the timer to count the duration of the static image. If the timer has been started, the display controller 210 will continue to accumulate the timing value of the timer. If the above-mentioned absolute difference A is greater than or equal to the predetermined value TH, it means that the average brightness YN and YN-1 of the current image (time point N) and the previous image (time point N-1) have changed greatly, so the display The controller 210 determines that the current image (time point N) and the previous image (time point N−1) are different images, and resets the timer value.

To sum up, the present invention provides a display device and its screen anti-burn-in method, which can determine whether the current image and the previous image in the video image from the host are substantially the same and determine the duration of the same image. When judging that the video image is a static picture, the display device can accumulate the timing value, and further reduce the brightness of each pixel of the current image of the video signal according to the size of the timing value, thereby reducing the overall brightness of the display panel when playing the static picture, so It can reduce the chance of image burn-in on the display panel.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should all belong to the protection scope of the appended claims of the present invention.

Claims (14)

1. A display device, characterized in that, comprising: a display panel; and A display controller, used for receiving a video signal from a host, and playing the video signal on the display panel; Wherein, the display controller calculates the screen average brightness of each image in the video signal, Wherein, when the absolute difference between the average brightness of the first frame of the current image and the average brightness of the second frame of the previous image in the video signal is less than a predetermined value, the display controller starts a timer to obtain a timing value, Wherein, when the timing value reaches the first period, the display controller reduces the brightness of each pixel of the current image of the video signal played on the display panel by a first ratio, Wherein, when the timing value reaches a second period, the display controller reduces the brightness of each pixel of the current image of the video signal played on the display panel by a second ratio, wherein the second period is greater than the first period , and the second ratio is greater than the first ratio. 2. The display device according to claim 1, wherein, when the timing value is greater than or equal to the third period, the display controller reduces the brightness of each pixel of the video signal played on the display panel to 0 , wherein the third period is greater than the second period. 3. The display device according to claim 1, wherein the display controller calculates the average value of the red sub-pixel, the green sub-pixel and the blue sub-pixel of each pixel of each image in the video image, and calculates The average sum of all pixels in each image is divided by the resolution of the display panel to obtain the average brightness of each image. 4. The display device of claim 1, wherein when the absolute difference is smaller than the predetermined value, the display controller determines that the current image and the previous image are substantially the same. 5. The display device according to claim 1, wherein when the absolute difference is greater than or equal to the predetermined value, the display controller judges that the current image and the previous image are different images, and resets the timer The timing value of . 6. The display device according to claim 1, wherein the display controller dynamically adjusts the predetermined value according to the average brightness of the current image. 7. The display device according to claim 6, wherein when the average brightness of the current image is in the first brightness range, the display controller sets the predetermined value as the first predetermined value, Wherein, when the average brightness of the picture of the current image is in the second brightness range, the display controller sets the predetermined value as the second predetermined value, Wherein, when the average brightness of the picture of the current image is in the third brightness range, the display controller sets the predetermined value as the third predetermined value, Wherein, the first brightness range is higher than the second brightness range, and the second brightness range is higher than the third brightness range, Wherein, the first predetermined value is greater than the second predetermined value, and the second predetermined value is greater than the third predetermined value. 8. A screen anti-burn-in method for a display device, wherein the display device includes a display panel and a display controller, characterized in that the method comprises: receiving a video signal from a host by using the display controller, and playing the video signal on the display panel; calculating the average brightness of each image in the video signal by using the display controller; When the absolute difference between the average brightness of the first frame of the current image and the average brightness of the second frame of the previous image in the video signal is less than a predetermined value, using the display controller to start a timer to obtain a timing value; When the timing value reaches a first period of time, using the display controller to reduce the brightness of each pixel of the current image of the video signal played on the display panel by a first ratio; and When the timing value reaches a second period, using the display controller to reduce the brightness of each pixel of the current image of the video signal played on the display panel by a second ratio, wherein the second period is greater than the first period, And the second ratio is greater than the first ratio. 9. The screen anti-burn-in method according to claim 8, further comprising: When the timing value is greater than or equal to a third period, the display controller reduces the brightness of each pixel of the video signal played on the display panel to 0, wherein the third period is greater than the second period. 10. The picture anti-burn-in method according to claim 8, wherein the step of using the display controller to calculate the picture average brightness of each image in the video signal comprises: Utilize this display controller to calculate the average value of the red sub-pixel, green sub-pixel and blue sub-pixel of each pixel in each image in the video image, and calculate the average sum of all pixels in each image, and then The average sum is divided by the resolution of the display panel to obtain the frame average brightness of each image. 11. The image anti-burn-in method according to claim 8, further comprising: when the absolute difference is less than the predetermined value, using the display controller to determine that the current image and the previous image are substantially the same. 12. The image anti-burn-in method according to claim 8, further comprising: when the absolute difference is greater than or equal to the predetermined value, using the display controller to determine that the current image and the previous image are different images, and Resets the timing value of the timer. 13. The image anti-burn-in method according to claim 8, further comprising: using the display controller to dynamically adjust the predetermined value according to the average brightness of the image of the current image. 14. The image anti-burn-in method according to claim 13, wherein the step of using the display controller to dynamically adjust the predetermined value according to the average brightness of the image of the current image comprises: When the screen average brightness of the current image is in the first brightness interval, the display controller sets the predetermined value as the first predetermined value; When the screen average brightness of the current image is in the second brightness range, the display controller sets the predetermined value as a second predetermined value; and When the screen average brightness of the current image is in the third brightness range, the display controller sets the predetermined value as a third predetermined value; Wherein, the first brightness range is higher than the second brightness range, and the second brightness range is higher than the third brightness range, Wherein, the first predetermined value is greater than the second predetermined value, and the second predetermined value is greater than the third predetermined value.

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