CN110767173A - Display driving method, display driver and display device - Google Patents

Abstract

The present invention provides a display driving method, a display driver and a display device. In the display driving method, a first driving signal is provided to a pixel unit connected to at least one gate line in at least one frame period of the pixel unit, and the frame period in which the first driving signal is located is divided into a first writing stage and a first light emitting stage and the extinguishing stage, the first driving signal includes: in the first writing stage, providing an effective voltage to the gate line and each data line, and providing an inactive voltage to the light-emitting control line corresponding to the gate line, so as to write the data voltage to the pixel unit; In the first light-emitting stage, an ineffective voltage is provided to the gate line, and an effective voltage is provided to the light-emitting control line corresponding to the gate line, so that the pixel unit emits light; Turn off the pixel cells. By applying the display driving method, the color shift of the light emitting diode display panel can be delayed and the service life can be improved.

Description

Display driving method, display driver, and display device

technical field

The present invention belongs to the field of display technology, and more particularly, relates to a display driving method, a display driver, and a display device.

Background technique

For light-emitting diode display panels such as organic light-emitting diode display panels or quantum dot light-emitting diode display panels, organic light-emitting substances that emit different colors or quantum dot light-emitting substances that emit different colors have different degrees of decay over time. . For example, the lifetime of blue organic light-emitting substances is shorter than that of red and green organic light-emitting substances. The organic light emitting diode display panel will turn yellow with the increase of usage time. Especially in the case of lower grayscale (darker display), the yellowing problem is more obvious. The problem of how to suppress the color shift of the light-emitting diode display panel over time is called a technical problem to be solved urgently.

SUMMARY OF THE INVENTION

The present invention provides a display driving method, a display driver, and a display device, which at least partially solve the technical problems existing in the prior art.

According to a first aspect of the present invention, there is provided a display driving method for driving a light emitting diode display panel, wherein the light emitting diode display panel includes a plurality of gate lines, a plurality of data lines, a plurality of light emission control lines and a plurality of pixel units, Each of the pixel units is connected to one of the gate lines, one of the light-emitting control lines, and one of the data lines. The pixel unit includes a driving transistor, a light-emitting diode, and a light-emitting control transistor. The first electrode of the driving transistor and the The second pole, the cathode and anode of the light-emitting diode, and the first and second poles of the light-emitting control transistor are all connected in series in the same current path, and the light-emitting control line is used to control the on-off of the corresponding light-emitting control transistor , providing a first drive signal to the pixel unit connected to at least one gate line in at least one frame period of the pixel unit, and the frame period in which the first drive signal is located is divided into a first writing phase, a first light emitting phase and In the extinguishing stage, the first driving signal includes: in the first writing stage, providing an effective voltage to the gate line and each of the data lines, and providing an inactive voltage to the light-emitting control line corresponding to the gate line, in order to write a data voltage to the pixel unit; in the first light-emitting stage, an inactive voltage is provided to the gate line, and an effective voltage is provided to the light-emitting control line corresponding to the gate line, so that the pixel unit emits light ; In the extinguishing stage, supply an inactive voltage to the light-emitting control line corresponding to the gate line, so as to extinguish the pixel unit.

Optionally, in the frame period in which the first driving signal is located, the extinguishing phase is located after the first lighting phase.

Optionally, in the frame period in which the first driving signal is located, the ratio of the duration of the extinguishing phase to the duration of the frame period is less than or equal to 0.2.

Optionally, the first driving signal is provided to each of the pixel units during the display process of the same frame.

Optionally, the display driving method further includes the step of judging whether to provide the first driving signal to each of the pixel units for the current frame image, wherein if the average brightness of the current frame image is less than the first threshold, send the signal to the pixel unit. Each of the pixel units provides a first drive signal; otherwise, a second drive signal is provided to each of the pixel units, and the frame period where the second drive signal is located is divided into a second writing stage and a second light-emitting stage, and sends a second drive signal to any gate. The second driving signal provided by the pixel unit connected to the line includes: in the second writing stage, supplying an effective voltage to the gate line and each of the data lines, and supplying an emission control line corresponding to the gate line with an effective voltage Inactive voltage is used to write data voltage to the pixel unit connected to the gate line; in the second light-emitting stage, an inactive voltage is provided to the gate line, and an effective voltage is provided to the light-emitting control line corresponding to the gate line, so as to make the pixel unit connected to the gate line emit light.

Optionally, in the case of judging that the first driving signal is provided to each of the pixel units, the display driving method further includes the step of setting the duration of the extinguishing phase, wherein according to the preset average gray level of the current frame image The mapping relationship between the level and the duration of the extinguishing phase determines the duration of the extinguishing phase when the current frame image is displayed, and the duration of the extinguishing phase gradually increases as the average gray scale decreases.

According to a second aspect of the present invention, there is provided a display driver for driving a light emitting diode display panel, wherein the light emitting diode display panel includes a plurality of gate lines, a plurality of data lines, a plurality of light emission control lines and a plurality of pixel units, each of which is Each of the pixel units is connected to one of the gate lines, one of the light-emitting control lines, and one of the data lines. The pixel units include a driving transistor, a light-emitting diode, and a light-emitting control transistor. The diode, the cathode and anode of the light-emitting diode, and the first and second electrodes of the light-emitting control transistor are all connected in series in the same current path, and the light-emitting control line is used to control the on-off of the corresponding light-emitting control transistor, The display driver includes a drive output module, the drive output module is connected to the gate line, the data line, and the light-emitting control line, and the drive output module is configured to send at least one gate line to the pixel unit connected to the pixel unit. A first driving signal is provided in at least one frame period of the pixel unit, and the frame period in which the first driving signal is located is divided into a first writing phase, a first light-emitting phase and an extinguishing phase, and the first driving signal includes: In the first writing stage, an effective voltage is provided to the gate line and each of the data lines, and an inactive voltage is provided to a light-emitting control line corresponding to the gate line, so as to write a data voltage to the pixel unit; In the first light-emitting stage, an inactive voltage is provided to the gate line, and an effective voltage is provided to the light-emitting control line corresponding to the gate line, so that the pixel unit emits light; in the extinguishing stage, the gate line is supplied with an effective voltage. The light-emitting control line corresponding to the line provides an inactive voltage to turn off the pixel unit.

Optionally, in the frame period in which the first driving signal is located, the extinguishing phase is located after the first lighting phase.

Optionally, in the frame period in which the first driving signal is located, the ratio of the duration of the extinguishing phase to the duration of the frame period is less than or equal to 0.2.

Optionally, the drive output module is configured to: provide the first drive signal to each of the pixel units during the display process of the same frame.

Optionally, the display driver further includes a configuration module configured to: for the current frame image, determine whether to provide the first drive signal to each of the pixel units, wherein if the average brightness of the current frame image is less than a first threshold , output the first command to the drive output module, so that the drive output module provides the first drive signal to each of the pixel units; otherwise, output the second command to the drive output module; the drive output module is configured to provide a second driving signal to each of the pixel units when the second instruction is received, and the frame period in which the second driving signal is located is divided into a second writing phase and a second light-emitting phase, The second driving signal provided by the pixel unit connected to any gate line includes: in the second writing stage, supplying an effective voltage to the gate line and each of the data lines, and emitting light to the corresponding gate line The control line provides an inactive voltage to write a data voltage to the pixel unit connected to the gate line; in the second light-emitting stage, an inactive voltage is provided to the gate line, and the light-emitting control line corresponding to the gate line is provided effective voltage, so that the pixel unit connected to the gate line emits light.

Optionally, the configuration module is further configured to: in the case that the average brightness of the current frame image is less than the first threshold, set the duration of the extinguishing phase, wherein the preset average gray level of the current frame image and The mapping relationship of the duration of the extinguishing phase determines the duration of the extinguishing phase when the current frame image is displayed, and the duration of the extinguishing phase gradually increases as the average gray level of all sub-pixels decreases.

And there is provided a display driver including a memory and a processor, the memory storing instructions, the processor executing the instructions to perform the display driving method according to the first aspect of the present invention.

According to a third aspect of the present invention, there is provided a display device comprising a light emitting diode display panel and a display driver for driving the light emitting diode display panel, wherein the display driver is the display driver of the second aspect of the present invention.

Description of drawings

FIG. 1 is a circuit diagram of a light emitting diode display panel according to an embodiment of the present invention;

2 is a flowchart of a display driving method according to an embodiment of the present invention;

3 is a timing diagram of a display driving method according to an embodiment of the present invention;

4 is a block diagram of a display driver of an embodiment of the present invention;

5 is a block diagram of another display driver according to an embodiment of the present invention;

Reference signs are: DL, data line; EML, light-emitting control line; GL, gate line; T0, driving crystal; T1, writing control transistor; T2, light-emitting control transistor; C1, first capacitor; D1, light-emitting diode; VDD, first power terminal; VSS, second power terminal; 100, configuration module; 200, drive output module; 300, memory; 400, processor.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Embodiments of the present invention provide a display driving method for driving a light-emitting diode D1 display panel. Specifically, the light emitting diode D1 display panel is, for example, an organic light emitting diode D1 display panel and a quantum dot light emitting diode D1 display panel.

As shown in FIG. 1 , the light emitting diode D1 display panel includes a plurality of gate lines GL, a plurality of data lines DL, a plurality of light emission control lines EML and a plurality of pixel units. The pixel units may be arranged in a matrix, the gate lines GL extend in the row direction, for example, the data lines DL extend in the column direction, for example, and the light emission control lines EML extend in the row direction, for example. Each pixel unit is connected to a gate line GL, an emission control line EML and a data line DL. For example, a row of pixel units is connected to the same gate line GL and the same light emission control line EML. The pixel units in the same column are connected to the same data line DL.

The pixel unit includes a driving transistor T0, a light-emitting diode D1 and a light-emitting control transistor T2. Of course, in order to realize writing of display data and storage of display data, the pixel unit further includes a writing control crystal T1 and a first capacitor C1. The first and second poles of the driving transistor T0, the cathode and anode of the light-emitting diode D1, and the first and second poles of the light-emitting control transistor T2 are all connected in series in the same current path, and the light-emitting control line EML is used to control the corresponding light-emitting Control the on-off of transistor T2.

Taking the organic light emitting diode D1 display panel as an example, for example, it includes red organic light emitting diodes, green organic light emitting diodes, and blue organic light emitting diodes. In particular, the embodiments of the present invention are also applicable to an organic light emitting diode display panel (also called a WOLED type display panel) with white organic light emitting diodes and three color filters of red, green and blue. This is because the organic functional layer of the white organic light-emitting diode is also composed of red organic light-emitting substances, green organic light-emitting substances and blue organic light-emitting substances.

In the display driving method of the embodiment of the present invention, a first driving signal is provided to a pixel unit connected to at least one gate line GL in at least one frame period of the pixel unit. Referring to FIG. 2 in combination with FIG. 1 and FIG. 3 , the frame period in which the first driving signal is located is divided into a first writing phase, a first light-emitting phase, and an extinguishing phase. As an example, all types of transistors in FIG. 1 are N-type thin film transistors, and the effective voltages of each signal in FIG. 3 are all high-level voltages. FIG. 3 shows the timing of supplying the first driving signal to the pixel unit connected to one gate line GL in one frame period. In FIG. 3, the signal supplied to the gate line GL is denoted by G, the signal supplied to the data line DL is denoted by D, and the signal supplied to the light emission control line EML is denoted by EM.

For the gate line GL currently under consideration, in the first writing stage P1, an effective voltage is provided to the gate line GL and each data line DL, and an inactive voltage is provided to the emission control line EML corresponding to the gate line GL, so as to write to the pixel unit input data voltage. At this time, the writing control crystal T1 is turned on, and the data voltage on the data line DL is stored to the gate of the driving transistor T0 and the first pole of the first capacitor C1 (the pole connected to the driving transistor T0). The light-emitting control transistor T2 is turned off, and the current path where the light-emitting diode D1 is located has no current. LED D1 does not emit light.

In the first light-emitting stage P2, an inactive voltage is provided to the gate line GL, and an effective voltage is provided to the light-emitting control line EML corresponding to the gate line GL, so that the pixel unit emits light. At this time, the writing control transistor T1 is turned off, and the gate voltage of the driving transistor T0 will not be affected whether or not there is a signal on the data line DL. From the first power supply terminal VDD, the source and drain of the light-emitting control transistor T2 (ie its first and second poles), the source and drain of the driving transistor T0 (and its first and second poles), and the light-emitting diode D1 The current paths of the anode and cathode to the second power supply terminal VSS are turned on, so that the light emitting diode D1 emits light. The pixel unit displays light of the desired brightness.

In the extinguishing phase P3, an inactive voltage is supplied to the light emitting control line EML corresponding to the gate line GL, so as to extinguish the pixel unit. At this time, the light-emitting control transistors T2 are all turned off, and the pixel unit does not emit light. Of course, for the purpose of minor changes to the existing driving timing and corresponding hardware, in the extinguishing phase P3, an inactive voltage is provided to the gate line GL (same as in the light-emitting phase P2), and an inactive voltage is provided to each data line DL ( The same as in the light-emitting phase P2).

In one frame period, the light-emitting time of the pixel unit connected to the gate line GL under consideration is shortened compared to the prior art. This also delays the aging speed of the inner luminescent layer, thereby delaying the color shift problem caused by the rapid aging of the luminescent layers of different colors.

Optionally, in the frame period in which the first driving signal is located, the extinguishing phase P3 is located after the first light-emitting phase P2. That is to say, for the pixel unit of the row currently under consideration, the light is first displayed and then turned off in the same frame period. Of course, the extinguishing stage P3 can also be located before the first light-emitting stage P2. That is, for the pixel unit of the row currently under investigation, in the same frame period, after the writing of the data voltage is completed, it does not emit light for a while, and then emits light after a period of time.

Optionally, in the frame period where the first driving signal is located, the ratio of the duration of the extinguishing phase P3 to the duration of the adjustment frame period is less than or equal to 0.2. If the duration of the extinguishing stage P3 is too long, it will cause obvious flickering, so it is necessary to set the extinguishing stage P3 to be relatively short.

Optionally, in the process of displaying the same frame of picture, the first driving signal is provided to each pixel unit. That is, if it is necessary to adjust the driving timings of the pixel units on the gate lines GL, the same adjustment is made to the driving timings of the pixel units on all the gate lines GL. This can simplify the complexity of the LED D1 display panel and the display driver.

Optionally, the display driving method further includes the step of judging whether to provide the first driving signal to each pixel unit for the current frame image, wherein if the average brightness of the current frame image is less than the first threshold, then providing the first driving signal to each pixel unit. drive signal; otherwise, a second drive signal is provided to each pixel unit, and the frame period where the second drive signal is located is divided into a second writing stage and a second light-emitting stage, and the second driving signal provided by any pixel unit connected to the gate line GL The signal includes: in the second writing stage P1a, supplying an effective voltage to the gate line GL and each data line DL, and supplying an inactive voltage to the light-emitting control line EML corresponding to the gate line L, so as to write to the pixel unit connected to the gate line GL In the second light-emitting stage P2a, an inactive voltage is provided to the gate line GL, and an effective voltage is provided to the light-emitting control line EML corresponding to the gate line GL, so that the pixel units connected to the gate line GL emit light.

For a brighter display image, if the pixel unit connected to each grid line has a long non-light-emitting time in one frame period, the overall flickering feeling will be more serious. For a darker display image, the overall flicker will be relatively weak. For example, the above-mentioned extinguishing stage P3 is set for a darker display screen, and the above-mentioned extinguishing stage P3 is not set for a darker display screen. That is, for part of the frame images, the above-mentioned optimized driving method is used for display driving, and for another part of the frame images, the conventional driving method is used for display driving. The judgment is based on the average gray level of all sub-pixels (in other words, the overall brightness). If the overall brightness of a frame of image to be displayed is high, the flicker felt by the user will be more obvious, and a conventional driving sequence is adopted. If the overall brightness of a frame of image to be displayed is low, the flicker felt by the user will not be obvious, and the above-mentioned optimized driving timing is adopted.

In the case of judging that the first driving signal is provided to each pixel unit, the display driving method further includes the step of setting the duration of the extinguishing phase, wherein the display is determined according to the preset mapping relationship between the average gray level of the current frame image and the duration of the extinguishing phase The duration of the extinguishing phase in the current frame image, and the duration of the extinguishing phase gradually increases as the average gray scale decreases.

That is, the lower the overall brightness of the picture to be displayed, the longer the duration of the extinguishing phase P3 in the frame period of each row of pixel units. This is also on the premise that the flicker felt by the user is not obvious, and the light-emitting time of the light-emitting layer is shortened as much as possible, thereby delaying its aging as much as possible.

Referring to FIG. 4 in conjunction with FIG. 1 and FIG. 3 , an embodiment of the present invention further provides a display driver for driving a light-emitting diode D1 display panel. The light-emitting diode D1 display panel includes a plurality of gate lines GL, a plurality of data lines DL, A plurality of light-emitting control lines EML and a plurality of pixel units, each pixel unit is connected to a gate line GL, a light-emitting control line EML and a data line DL, the pixel unit includes a driving transistor T0, a light-emitting diode D1 and a light-emitting control transistor T2. The first and second poles of the transistor T0, the cathode and anode of the light-emitting diode D1, and the first and second poles of the light-emitting control transistor T2 are all connected in series in the same current path, and the light-emitting control line EML is used to control the corresponding light-emitting control On-off of transistor T2. The display driver is used to implement the aforementioned display driving method, and the specific principles and details of the operation of each structure can be referred to the introduction in the aforementioned part.

The display driver includes a drive output module 200, the drive output module 200 is connected to the gate line GLGL, the data line DLDL, and the light emission control line EMLEML, and is configured to provide at least one pixel unit connected to the gate line GL during at least one frame period of the pixel unit. The first driving signal, the frame period in which the first driving signal is located is divided into a first writing stage, a first light-emitting stage and a extinguishing stage, and the first driving signal includes: in the first writing stage, to the gate line GL and each data line DL provides an effective voltage, and provides an inactive voltage to the light-emitting control line EML corresponding to the gate line GL, so as to write a data voltage to the pixel unit; in the first light-emitting stage, an inactive voltage is provided to the gate line GL, and an inactive voltage is provided to the gate line GL corresponding to the gate line GL. The light-emitting control line EML provides an effective voltage to make the pixel unit emit light; in the extinguishing stage, an inactive voltage is provided to the light-emitting control line EML corresponding to the gate line GL to extinguish the pixel unit.

Optionally, in the frame period in which the first driving signal is located, the extinguishing stage is located after the first light-emitting stage.

Optionally, in the frame period where the first driving signal is located, the ratio of the duration of the extinguishing phase to the duration of the frame period is less than or equal to 0.2.

Optionally, the drive output module 200 is configured to: provide the first drive signal to each pixel unit during the display process of the same frame.

Optionally, the display driver further includes a configuration module 100, which is configured to: for the current frame image, determine whether to provide the first drive signal to each pixel unit, wherein, if the average brightness of the current frame image is less than the first threshold, send the signal to the current frame image. The drive output module 200 outputs the first instruction, so that the drive output module 200 provides the first drive signal to each pixel unit; otherwise, outputs the second instruction to the drive output module 200; the drive output module 200 is configured to receive the second instruction Under the circumstance, the second driving signal is provided to each pixel unit, and the frame period where the second driving signal is located is divided into the second writing phase and the second light emitting phase, and the second driving signal provided by the pixel unit connected to any gate line GL The signal includes: in the second writing stage, providing an effective voltage to the gate line GL and each data line DL, and providing an inactive voltage to the light-emitting control line EML corresponding to the gate line GL, so as to write data to the pixel unit connected to the gate line GL voltage; in the second light-emitting stage, an inactive voltage is provided to the gate line GL, and an effective voltage is provided to the light-emitting control line EML corresponding to the gate line GL, so that the pixel units connected to the gate line GL emit light.

Optionally, the configuration module 100 is further configured to: when the average brightness of the current frame image is less than the first threshold, set the duration of the extinguishing phase, wherein the preset average grayscale of the current frame image and the duration of the extinguishing phase are set. The mapping relationship of , determines the duration of the extinguishing phase when the current frame image is displayed, and the duration of the extinguishing phase gradually increases as the average gray level of all sub-pixels decreases.

Of course, the configuration module 100 and the driver output module 200 in the display driver can be integrated in the same driver chip, or distributed in multiple driver chips (for example, distributed in a source driver chip, a gate driver chip, a timing control chip, etc.)

Referring to FIG. 5 in combination with FIG. 1 and FIG. 3 , an embodiment of the present invention further provides a display driver, including a memory 300 and a processor 400 , the memory 300 stores instructions, and the processor 400 executes the instructions to execute the aforementioned display driving method.

Specifically, the memory 300 is, for example, a read-only memory 300 (ROM), a random access memory 300 (RAM), or any other device with a storage function. The processor 400 is, for example, a microprocessor 400 (MCU), a central processing unit 400 (CPU), or the like. Of course, the memory 300 and the processor 400 may also be integrated in the same device.

Embodiments of the present invention further provide a display device, including a light-emitting diode D1 display panel and a display driver for driving the light-emitting diode D1 display panel, where the display driver is the aforementioned display driver.

The display device is, for example, an organic light-emitting diode D1 display module, a quantum dot light-emitting diode D1 display module, a mobile phone, a display, or any other product or component with a display function.

It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, without departing from the spirit and essence of the present invention, various modifications and improvements can be made, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (14)

1. A display driving method is used for driving a light-emitting diode display panel, the light-emitting diode display panel comprises a plurality of grid lines, a plurality of data lines, a plurality of light-emitting control lines and a plurality of pixel units, each pixel unit is connected with one grid line, one light-emitting control line and one data line, each pixel unit comprises a driving transistor, a light-emitting diode and a light-emitting control transistor, a first pole and a second pole of the driving transistor, a cathode and an anode of the light-emitting diode and a first pole and a second pole of the light-emitting control transistor are connected in series in the same current path, and the light-emitting control lines are used for controlling the on-off of the corresponding light-emitting control transistors A first lighting phase and a blanking phase, the first driving signal comprising:

in the first writing stage, providing effective voltage to the grid lines and the data lines, and providing invalid voltage to the light-emitting control lines corresponding to the grid lines so as to write data voltage into the pixel units;

in the first light-emitting stage, providing an invalid voltage to the grid line, and providing an effective voltage to a light-emitting control line corresponding to the grid line so as to enable the pixel unit to emit light;

and in the extinguishing stage, providing an invalid voltage to the light-emitting control line corresponding to the grid line so as to extinguish the pixel unit.

2. The display driving method according to claim 1, wherein the first driving signal is in a frame period, and the blanking period is after the first light-emitting period.

3. The display driving method according to claim 1, wherein a ratio of a duration of the blanking period to a duration of the frame period in a frame period in which the first driving signal is present is less than or equal to 0.2.

4. The display driving method according to claim 1, wherein the first driving signal is supplied to each of the pixel units during display of a same frame.

5. The display driving method according to claim 4, further comprising the step of determining whether to provide the first driving signal to each of the pixel units for a current frame image, wherein if an average luminance of the current frame image is smaller than a first threshold, the first driving signal is provided to each of the pixel units; otherwise, providing a second driving signal to each pixel unit, wherein a frame period of the second driving signal is divided into a second writing stage and a second light-emitting stage, and the second driving signal provided to the pixel unit connected to any gate line comprises:

in the second writing stage, providing effective voltage to the grid lines and the data lines, and providing ineffective voltage to the light-emitting control lines corresponding to the grid lines so as to write data voltage to the pixel units connected with the grid lines;

and in the second light-emitting stage, providing an invalid voltage for the grid line and providing an effective voltage for the light-emitting control line corresponding to the grid line so as to enable the pixel unit connected with the grid line to emit light.

6. The display driving method according to claim 5, wherein in a case where it is determined that the first driving signal is provided to each of the pixel units, the display driving method further comprises a step of setting the blanking period duration, wherein the blanking period duration when the current frame image is displayed is determined according to a preset mapping relationship between an average gray scale of the current frame image and the blanking period duration, and the blanking period duration gradually increases as the average gray scale decreases.

7. A display driver is used for driving a light emitting diode display panel, the light emitting diode display panel comprises a plurality of grid lines, a plurality of data lines, a plurality of light emitting control lines and a plurality of pixel units, each pixel unit is connected with one grid line, one light emitting control line and one data line, the pixel unit comprises a driving transistor, a light emitting diode and a light emitting control transistor, a first pole and a second pole of the driving transistor, a cathode and an anode of the light emitting diode and a first pole and a second pole of the light emitting control transistor are all connected in series in the same current path, the light emitting control lines are used for controlling the on-off of the corresponding light emitting control transistors,

the display driver comprises a driving output module, the driving output module is connected with the grid lines, the data lines and the light-emitting control lines, the driving output module is configured to provide a first driving signal to a pixel unit connected with at least one grid line in at least one frame period of the pixel unit, the frame period of the first driving signal is divided into a first writing stage, a first light-emitting stage and a light-off stage, and the first driving signal comprises:

in the first writing stage, providing effective voltage to the grid lines and the data lines, and providing invalid voltage to the light-emitting control lines corresponding to the grid lines so as to write data voltage into the pixel units;

in the first light-emitting stage, providing an invalid voltage to the grid line, and providing an effective voltage to a light-emitting control line corresponding to the grid line so as to enable the pixel unit to emit light;

and in the extinguishing stage, providing an invalid voltage to the light-emitting control line corresponding to the grid line so as to extinguish the pixel unit.

8. The display driver of claim 7, wherein the first driving signal is in a frame period, and the blanking period is after the first light-emitting period.

9. The display driver of claim 7, wherein a ratio of a duration of the blanking period to a duration of the frame period in a frame period of the first driving signal is less than or equal to 0.2.

10. The display driver of claim 7, wherein the drive output module is configured to: and in the display process of the same frame of picture, providing the first driving signal to each pixel unit.

11. The display driver of claim 10, further comprising a configuration module configured to: judging whether the current frame image is provided with the first driving signals to each pixel unit, wherein if the average brightness of the current frame image is smaller than a first threshold value, a first instruction is output to the driving output module so that the driving output module provides the first driving signals to each pixel unit; otherwise, outputting a second switching instruction to the drive output module;

the driving output module is configured to provide a second driving signal to each pixel unit under the condition of receiving the second instruction, the frame period of the second driving signal is divided into a second writing phase and a second light-emitting phase, and the second driving signal provided to the pixel unit connected to any gate line includes:

in the second writing stage, providing effective voltage to the grid lines and the data lines, and providing ineffective voltage to the light-emitting control lines corresponding to the grid lines so as to write data voltage to the pixel units connected with the grid lines;

and in the second light-emitting stage, providing an invalid voltage for the grid line and providing an effective voltage for the light-emitting control line corresponding to the grid line so as to enable the pixel unit connected with the grid line to emit light.

12. The display driver of claim 1, wherein the configuration module is further configured to: and setting the extinguishing stage time length under the condition that the average brightness of the current frame image is smaller than a first threshold, wherein the extinguishing stage time length is determined when the current frame image is displayed according to the mapping relation between the preset average gray scale of the current frame image and the extinguishing stage time length, and the extinguishing stage time length is gradually increased along with the reduction of the average gray scale of all the sub-pixels.

13. A display driver comprising a memory storing instructions and a processor executing the instructions to perform a display driving method according to any one of claims 1 to 6.

14. A display device comprising a light emitting diode display panel and a display driver for driving the light emitting diode display panel, the display driver being according to any one of claims 7 to 13.

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