Method for regulating and controlling driving of light-emitting device based on one-way cut-off current gate

Abstract

The invention discloses a method for regulating and controlling driving of a light-emitting device based on a one-way cut-off current gate. The method comprises the following steps: acquiring each display gray-scale value in a first preset frame number to be displayed by the light-emitting device; obtaining a first gray scale fluctuation coefficient according to the display gray scale value; whether the first gray scale fluctuation coefficient is smaller than a standard gray scale fluctuation coefficient or not is judged, if yes, first standard grid regulation and control current is obtained, and the first standard grid regulation and control current is applied to the light-emitting device; if not, the first preset frame number is divided into a plurality of continuous sub-frame numbers, so that the second gray scale fluctuation coefficient corresponding to each continuous sub-frame number is smaller than the standard gray scale fluctuation coefficient, and the number of the continuous sub-frame numbers is minimum; and obtaining a second standard grid regulation and control current of each continuous subframe number, and applying the corresponding second standard grid regulation and control current to the light-emitting device. According to the invention, the gate flow regulation frequency in a high-frequency environment can be reduced, the abnormality of a one-way current interception gate structure is avoided, and meanwhile, the regulation effect of luminous efficiency is ensured.

Description

Technical Field

[0001] The invention relates to the field of optoelectronic display, and in particular to a method for driving a light-emitting device based on regulating a unidirectional current-cutoff current grid. Background Art

[0002] Due to process conditions and material properties, there are natural and difficult-to-eliminate differences in the mobility of electrons and holes, which often leads to serious imbalances in charge carriers in the light-emitting layer of QLED devices. This imbalance not only makes it difficult for charge carriers in the free state to achieve ideal efficiency when they recombine, which in turn has a serious negative impact on the luminescence performance of the entire device, but also becomes a key bottleneck restricting the further development and performance improvement of QLED technology. This problem is also common in organic light-emitting diode (OLED) devices, and has become a common problem that restricts the further improvement of the performance of these two types of display technologies.

[0003] In the related technology, the amount of electrons or holes injected can be regulated by gate regulation, which can effectively improve the recombination process of charge carriers and balance the mobility of electrons and holes, thereby significantly improving the luminous efficiency and performance of QLED and OLED devices. Gate regulation is divided into gate voltage regulation and gate current regulation. Gate current regulation can avoid the problem of carrier conduction or electric field shielding, which affects the effective injection of regulated carriers and causes the problem of inefficient regulation. However, gate current regulation requires a unidirectional current cutoff gate structure, and the performance of the unidirectional current cutoff gate structure may decrease under high-frequency signals (when the display frame rate is high), resulting in distortion or instability of the gate current signal, thereby affecting the regulation result, and frequent high-frequency adjustment of the gate current is likely to damage the unidirectional current cutoff gate structure. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a method for driving a light-emitting device based on unidirectional current cutoff gate regulation, aiming to reduce the number of gate current regulation times in a high-frequency environment to avoid abnormalities in the unidirectional current cutoff gate structure, while ensuring the regulation effect of the luminous efficiency.

[0005] To achieve the above-mentioned purpose, the present invention discloses a driving method of a light-emitting device based on a unidirectional current-cutoff gate, which is applied to a unidirectional current-cutoff gate-controlled light-emitting device. The unidirectional current-cutoff gate-controlled light-emitting device comprises an anode, a first hole transport layer, a light-emitting composite layer, a first electron transport layer, and a cathode in sequence. The unidirectional current-cutoff gate-controlled light-emitting device also comprises a unidirectional current-cutoff gate structure. The unidirectional current-cutoff gate structure is arranged between the cathode and the first electron transport layer or between the first hole transport layer and the anode. The unidirectional current-cutoff gate structure adjusts the unidirectional flow momentum of carriers to change the amount of carrier recombination in the light-emitting composite layer, thereby adjusting the luminous efficiency of the light-emitting device. The method comprises:

[0006] Step S1, obtaining each display grayscale value within a first preset number of frames to be displayed by the light emitting device; obtaining the first grayscale mean value according to the display grayscale value corresponding to each frame within the first preset number of frames;

[0007] Step S2, obtaining a first grayscale fluctuation coefficient corresponding to the first preset frame number according to each of the displayed grayscale values ​​and the first grayscale mean value; wherein the first grayscale fluctuation coefficient includes one of a variance, a standard deviation and a coefficient of variation;

[0008] Step S3, determining whether the first grayscale fluctuation coefficient is less than the standard grayscale fluctuation coefficient, if so, obtaining a first standard gate regulation current corresponding to the first grayscale mean value, and applying the first standard gate regulation current during the process of the light-emitting device displaying the first preset number of frames; if not, proceeding to step S4;

[0009] Step S4, dividing the first preset frame number into a plurality of continuous sub-frame numbers, so that the second grayscale fluctuation coefficient corresponding to each of the continuous sub-frame numbers is smaller than the standard grayscale fluctuation coefficient and the number of the continuous sub-frame numbers is minimized; wherein the continuous sub-frame number includes at least one frame;

[0010] Step S5, obtaining a second standard gate regulation current corresponding to the second grayscale mean value of each of the continuous sub-frame numbers, and applying the second standard gate regulation current corresponding to the continuous sub-frame number when the light-emitting device displays a certain continuous sub-frame number.

[0011] Optionally, when the unidirectional current cutoff gate structure is arranged between the cathode and the first electron transport layer, the unidirectional current cutoff gate structure includes a thin hole transport layer, a second electron transport layer and the first regulation electrode; when the unidirectional current cutoff gate structure is arranged between the first hole transport layer and the anode, the unidirectional current cutoff gate structure includes a thin electron transport layer, a second hole transport layer and the first regulation electrode.

[0012] Optionally, step S2 includes:

[0013] According to each of the displayed grayscale values ​​and the first grayscale mean, a first variance corresponding to the first preset number of frames is obtained, and the first variance is used as the first grayscale fluctuation coefficient; wherein the standard grayscale fluctuation coefficient is the variance.

[0014] Optionally, step S2 includes:

[0015] According to each of the displayed grayscale values ​​and the first grayscale mean value, a first standard deviation corresponding to the first preset frame number is obtained, and the first standard deviation is used as the first grayscale fluctuation coefficient; wherein the standard grayscale fluctuation coefficient is the standard deviation.

[0016] Optionally, step S2 includes:

[0017] Obtaining a second variance and a second standard deviation corresponding to the first preset number of frames according to each of the displayed grayscale values ​​and the first grayscale mean value;

[0018] A first coefficient of variation is obtained according to a ratio of the second variance to the second standard deviation, and the first coefficient of variation is used as the first grayscale fluctuation coefficient; wherein the standard grayscale fluctuation coefficient is the coefficient of variation.

[0019] Optionally, obtaining a first standard gate regulation current corresponding to the first grayscale mean value in step S3 includes:

[0020] Determine whether the first grayscale mean value is an integer. If so, directly obtain the corresponding first standard gate regulation current; if not, round it off to obtain the first standard gate regulation current corresponding to the rounded first grayscale mean value.

[0021] Optionally, step S4 further includes:

[0022] Obtaining a second grayscale mean value corresponding to each of the continuous subframes; and obtaining the second grayscale fluctuation coefficient corresponding to each of the continuous subframes according to each of the display grayscale values ​​in each of the continuous subframes and the corresponding second grayscale mean value.

[0023] Optionally, the standard gate regulation current corresponding to each grayscale value enables the luminous efficiency of the light-emitting device at the grayscale value to meet the standard luminous efficiency.

[0024] Optionally, the light-emitting composite layer is LED, OLED or QLED.

[0025] Beneficial effects of the present invention: 1. The present invention determines the standard gate control current according to the fluctuation of the display grayscale value change of the first preset frame number. When the fluctuation of the display grayscale value change is less than the standard grayscale fluctuation coefficient, it means that the display grayscale value change within the first preset frame number is relatively stable, and a uniform standard gate control current can be used. This can avoid the need to change the gate control current for each frame. At the same time, because the display grayscale values ​​within the first preset frame number are not much different, even if the same gate control current is used, the corresponding luminous efficiency will not change too much. When the fluctuation of the display grayscale value change is less than the standard grayscale fluctuation coefficient, the present invention effectively reduces the number of gate control current changes while ensuring the luminous efficiency. 2. When the fluctuation of the display grayscale value change is greater than or equal to the standard grayscale fluctuation coefficient, the present invention divides the first preset frame number into a plurality of continuous sub-frame numbers so that the second grayscale fluctuation coefficient corresponding to each continuous sub-frame number is less than the standard grayscale fluctuation coefficient and the number of continuous sub-frame numbers is minimized. When the fluctuation of the displayed grayscale value is greater than or equal to the standard grayscale fluctuation coefficient, it means that the fluctuation of the displayed grayscale value of the first preset frame number is large. The present invention can divide the first preset frame number into multiple relatively stable (small fluctuation) continuous sub-frame numbers, and then use a uniform and unchanged standard gate regulation current in each continuous sub-frame number. In this way, the number of changes of the gate regulation current can be effectively reduced while ensuring the luminous efficiency.

[0026] In summary, the present invention can reduce the number of gate current regulation times in a high-frequency environment to avoid abnormal unidirectional current interception gate structure, while ensuring the regulation effect of luminous efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of a method for driving a light-emitting device based on a unidirectional current-cutoff current gate provided by a specific embodiment of the present invention;

[0028] Figure 2 It is a structural schematic diagram of a unidirectional current-cutoff current gate-regulated light-emitting device provided by a specific embodiment of the present invention;

[0029] Figure 3 It is a structural schematic diagram of a unidirectional current-cutoff current gate-regulated light-emitting device provided by another specific embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of a unidirectional current-cutoff current gate regulating the movement of carriers in a light-emitting device provided by a specific embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of dividing the number of consecutive subframes provided by a specific embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention discloses a method for driving a light-emitting device based on a unidirectional current-cutoff current gate. Those skilled in the art can refer to the content of this article and appropriately improve the technical details for implementation. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are all deemed to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0033] The applicant has found through research that: in the relevant technology, the amount of electron or hole injection can be regulated by gate regulation, which can effectively improve the recombination process of charge carriers, balance the mobility of electrons and holes, and thus significantly improve the luminous efficiency and performance of QLED and OLED devices. Gate regulation is divided into gate voltage regulation and gate current regulation. Gate current regulation can avoid the problem of carrier conduction or electric field shielding, which affects the effective injection of regulated carriers and causes the problem of failure to efficiently regulate. However, gate current regulation requires a unidirectional current cutoff gate structure, and the performance of the unidirectional current cutoff gate structure may decrease under high-frequency signals (when the display frame rate is high), resulting in distortion or instability of the gate current signal, thereby affecting the regulation result, and frequent high-frequency adjustment of the gate current is likely to damage the unidirectional current cutoff gate structure.

[0034] Therefore, an embodiment of the present invention provides a method for driving a light-emitting device based on a unidirectional current-cutoff gate control, which is applied to a unidirectional current-cutoff gate control light-emitting device. The unidirectional current-cutoff gate control light-emitting device includes an anode, a first hole transport layer, a light-emitting composite layer, a first electron transport layer, and a cathode in sequence. The unidirectional current-cutoff gate control light-emitting device also includes a unidirectional current-cutoff gate structure. The unidirectional current-cutoff gate structure is arranged between the cathode and the first electron transport layer or between the first hole transport layer and the anode. The unidirectional current-cutoff gate structure adjusts the unidirectional flow momentum of carriers to change the amount of carrier recombination in the light-emitting composite layer, thereby adjusting the luminous efficiency of the light-emitting device. Figure 1 As shown, the method includes:

[0035] Step S1, obtaining each display grayscale value within a first preset number of frames to be displayed by the light-emitting device; and obtaining a first grayscale average value according to the display grayscale value corresponding to each frame within the first preset number of frames.

[0036] It should be noted that the light emitting device is displayed in frames in the corresponding display. In a high frame rate display, the frame rate is 60, which generally means refreshing 60 times per second, which means that the light emitting device needs to display 60 grayscale values ​​within one second. The first preset frame number of the embodiment of the present invention is a series of frames displayed by the light emitting device next, and each frame corresponds to a grayscale value. The first grayscale mean value is the average value of all displayed grayscale values ​​within the first preset frame number.

[0037] In this specific embodiment, when the unidirectional current cutoff gate structure is arranged between the cathode and the first electron transport layer, the unidirectional current cutoff gate structure includes a thin hole transport layer, a second electron transport layer and a first regulation electrode; when the unidirectional current cutoff gate structure is arranged between the first hole transport layer and the anode, the unidirectional current cutoff gate structure includes a thin electron transport layer, a second hole transport layer and a first regulation electrode.

[0038] Respectively Figure 2 As shown, the unidirectional current cutoff current gate regulated light-emitting device includes an anode 201, a first hole transport layer 202, a light-emitting composite layer 203, a first electron transport layer 204, and a cathode 205 in sequence, and when the unidirectional current cutoff current gate structure 207 is arranged between the cathode 205 and the first electron transport layer 204, the unidirectional current cutoff current gate structure 207 includes a thin hole transport layer 208, a second electron transport layer 209 and a first regulating electrode 210.

[0039] as well as Figure 3 As shown, the unidirectional current cutoff current gate regulated light-emitting device includes an anode 201, a first hole transport layer 202, a light-emitting composite layer 203, a first electron transport layer 204, and a cathode 205 in sequence, and when the unidirectional current cutoff current gate structure 207 is arranged between the first hole transport layer 202 and the anode 201, the unidirectional current cutoff current gate structure includes a thin electron transport layer 213, a second hole transport layer 214 and a first regulating electrode 210.

[0040] in, Figure 2 The corresponding gate control principle of the unidirectional current-cutoff gate-controlled light-emitting device is as follows: Figure 4 As shown, the first regulating electrode 210 applies a positive potential relative to the cathode 205, the thin hole transport layer 208 and the second electron transport layer 209 are connected, the cathode electrons are controlled by the regulating electrode and injected into the thin hole transport layer 208 and further injected into the light-emitting composite layer 203 through the first electron transport layer 204 to participate in the recombination, and the holes on the anode 201 are also injected into the light-emitting composite layer 203; at this time, the first gate regulating current applied by the first regulating electrode 210 relative to the cathode 205 can be set according to the amount of anode hole injection, thereby changing the luminous efficiency. Figure 3 The regulation principle and Figure 2 The same, no further elaboration.

[0041] In this specific embodiment, the light emitting composite layer is an LED, an OLED or a QLED.

[0042] Step S2, obtaining a first grayscale fluctuation coefficient corresponding to a first preset number of frames according to each displayed grayscale value and the first grayscale mean value; wherein the first grayscale fluctuation coefficient includes one of a variance, a standard deviation and a coefficient of variation.

[0043] In the first specific embodiment, step S2 includes:

[0044] According to each display grayscale value and the first grayscale mean, a first variance corresponding to the first preset number of frames is obtained, and the first variance is used as a first grayscale fluctuation coefficient; wherein the standard grayscale fluctuation coefficient is the variance.

[0045] In the second specific embodiment, step S2 includes:

[0046] According to each display grayscale value and the first grayscale mean, a first standard deviation corresponding to the first preset frame number is obtained, and the first standard deviation is used as a first grayscale fluctuation coefficient; wherein the standard grayscale fluctuation coefficient is the standard deviation.

[0047] In the third specific embodiment, step S2 includes:

[0048] Obtaining a second variance and a second standard deviation corresponding to a first preset number of frames according to each display grayscale value and the first grayscale mean;

[0049] A first coefficient of variation is obtained according to a ratio of the second variance to the second standard deviation, and the first coefficient of variation is used as a first grayscale fluctuation coefficient; wherein the standard grayscale fluctuation coefficient is the coefficient of variation.

[0050] It should be noted that the coefficients corresponding to the three embodiments can all measure the variation fluctuation of the grayscale value within the first preset frame number, and the larger the coefficient, the greater the variation fluctuation.

[0051] Step S3, determine whether the first grayscale fluctuation coefficient is less than the standard grayscale fluctuation coefficient. If so, obtain the first standard gate regulation current corresponding to the first grayscale mean value, and apply the first standard gate regulation current when the light-emitting device displays the first preset frame number; if not, proceed to step S4.

[0052] It should be noted that when the first grayscale fluctuation coefficient is less than the standard grayscale fluctuation coefficient, it means that the fluctuation amplitude of the grayscale value within the first preset frame number is small, that is, the grayscale values ​​displayed within the first preset frame number are similar (the grayscale values ​​displayed are similar, and the corresponding standard gate control currents are also similar). At this time, the same unchanged gate control current is used to ensure that the luminous efficiency does not deviate too much from the ideal, and at the same time, the number of gate control current controls can be reduced to avoid abnormalities in the unidirectional current interception gate structure. When the first grayscale fluctuation coefficient is greater than or equal to the standard grayscale fluctuation coefficient, it means that the fluctuation amplitude of the grayscale value within the first preset frame number is large, that is, the grayscale values ​​displayed within the first preset frame number are quite different. At this time, the same unchanged gate control current is no longer used to avoid affecting the control effect of the luminous efficiency.

[0053] It is worth mentioning that the first standard gate regulation current corresponding to the first grayscale average is used to ensure that it will not differ too much from the standard gate regulation current corresponding to each display grayscale value within the first preset frame number, thereby ensuring the regulation effect of luminous efficiency.

[0054] In this specific embodiment, the standard gate control current corresponding to each grayscale value enables the luminous efficiency of the light-emitting device at the grayscale value to meet the standard luminous efficiency.

[0055] In this specific embodiment, obtaining a first standard gate control current corresponding to a first grayscale mean value in step S3 includes:

[0056] It is determined whether the first grayscale mean value is an integer. If so, the corresponding first standard gate regulation current is directly obtained; if not, rounding is performed to obtain the first standard gate regulation current corresponding to the rounded first grayscale mean value.

[0057] It should be noted that, because the first grayscale mean is an average, it may contain decimals, and the grayscale value is generally an integer of 0-255, so the decimals need to be carried forward.

[0058] Step S4, dividing the first preset frame number into a plurality of continuous sub-frame numbers, so that the second grayscale fluctuation coefficient corresponding to each continuous sub-frame number is smaller than the standard grayscale fluctuation coefficient and the number of continuous sub-frame numbers is minimized.

[0059] The continuous sub-frame number includes at least one frame. It is worth mentioning that if the grayscale value of one frame of the first preset frame number is too different from the grayscale values ​​of the previous and next frames, a single frame can be used as a continuous sub-frame number. This can effectively ensure the luminous efficiency.

[0060] It should be noted that when the first grayscale fluctuation coefficient is greater than or equal to the standard grayscale fluctuation coefficient, it means that the grayscale value has a large fluctuation amplitude within the first preset frame number, that is, the grayscale values ​​displayed within the first preset frame number are greatly different. At this time, the same unchanged gate control current is no longer used to avoid affecting the control effect of the luminous efficiency. However, the embodiment of the present invention can divide the first preset frame number into a plurality of continuous sub-frames with a small fluctuation amplitude, while ensuring that the number of continuous sub-frames is minimized. In this way, the same processing method as the first preset frame number can be used to make the display grayscale value within the same continuous sub-frame number use the same gate control current, because the display grayscale value within the same continuous sub-frame number is similar, and the use of the same gate control current can also ensure that the luminous efficiency will not deviate too much from the ideal, and once the number of frames within the continuous sub-frame number is greater than one, the number of gate current controls can be reduced compared to the prior art. On the other hand, the present invention minimizes the number of continuous sub-frames, that is, the number of gate current controls is minimized, the number of controls is reduced, and the abnormality of the unidirectional current intercepting gate structure is avoided.

[0061] In this specific embodiment, Figure 5 As shown, Figure 5 In the embodiment, the first preset frame number is divided into three consecutive sub-frame numbers (a first consecutive sub-frame number, a second consecutive sub-frame number, and a third consecutive sub-frame number) to ensure that the displayed grayscale value within the consecutive sub-frame numbers changes smoothly.

[0062] In this specific embodiment, step S4 also includes:

[0063] The second grayscale mean value corresponding to each continuous subframe number is obtained; and the second grayscale fluctuation coefficient corresponding to each continuous subframe number is obtained according to each display grayscale value in each continuous subframe number and its corresponding second grayscale mean value.

[0064] Similar to step S2, the processing of the number of consecutive subframes is the same as the first preset number of frames.

[0065] Step S5, obtaining a second standard gate control current corresponding to the second grayscale mean value of each continuous sub-frame number, and applying the second standard gate control current corresponding to a certain continuous sub-frame number when the light-emitting device displays a certain continuous sub-frame number.

[0066] It should be noted that applying the gate control current means applying the control gate current to the first control electrode of the light emitting device. The control gate current is applied when the light emitting device starts to emit light.

[0067] The embodiment of the present invention determines the standard gate control current according to the fluctuation of the display grayscale value change of the first preset frame number. When the fluctuation of the display grayscale value change is less than the standard grayscale fluctuation coefficient, it means that the display grayscale value change within the first preset frame number is relatively stable, and a uniform standard gate control current can be used. This can avoid the need to change the gate control current for each frame. At the same time, because the display grayscale values ​​within the first preset frame number are not much different, even if the same gate control current is used, the corresponding luminous efficiency will not change too much. When the fluctuation of the display grayscale value change is less than the standard grayscale fluctuation coefficient, the embodiment of the present invention effectively reduces the number of gate control current changes while ensuring the luminous efficiency.

[0068] When the fluctuation of the grayscale value change is greater than or equal to the standard grayscale fluctuation coefficient, the embodiment of the present invention divides the first preset frame number into a plurality of continuous sub-frame numbers, so that the second grayscale fluctuation coefficient corresponding to each continuous sub-frame number is less than the standard grayscale fluctuation coefficient and the number of continuous sub-frame numbers is minimized. When the fluctuation of the grayscale value change is greater than or equal to the standard grayscale fluctuation coefficient, it means that the fluctuation of the grayscale value change of the first preset frame number is large. The embodiment of the present invention can divide the first preset frame number into a plurality of relatively stable (small fluctuation) continuous sub-frame numbers, and then use a uniform and unchanged standard gate control current in each continuous sub-frame number. In this way, the number of changes of the gate control current can be effectively reduced while ensuring the luminous efficiency.

[0069] In summary, the embodiments of the present invention can reduce the number of gate current regulation times in a high-frequency environment to avoid abnormal unidirectional current interception gate structure, while ensuring the regulation effect of luminous efficiency.

[0070] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0071] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for driving a light-emitting device based on a unidirectional current-cutoff current gate, applied to a light-emitting device controlled by a unidirectional current-cutoff current gate, characterized in that: The unidirectional current-cutoff gate-regulated light-emitting device comprises an anode, a first hole transport layer, a light-emitting composite layer, a first electron transport layer, and a cathode in sequence. The unidirectional current-cutoff gate-regulated light-emitting device further comprises a unidirectional current-cutoff gate structure. The unidirectional current-cutoff gate structure is arranged between the cathode and the first electron transport layer or between the first hole transport layer and the anode. The unidirectional current-cutoff gate structure adjusts the unidirectional flow momentum of carriers to change the amount of carrier recombination in the light-emitting composite layer, thereby adjusting the luminous efficiency of the light-emitting device. The method comprises: Step S1, obtaining each display grayscale value within a first preset number of frames to be displayed by the light emitting device; obtaining the first grayscale mean value according to the display grayscale value corresponding to each frame within the first preset number of frames; Step S2, obtaining a first grayscale fluctuation coefficient corresponding to the first preset frame number according to each of the displayed grayscale values ​​and the first grayscale mean value; wherein the first grayscale fluctuation coefficient includes one of a variance, a standard deviation and a coefficient of variation; Step S3, determining whether the first grayscale fluctuation coefficient is less than the standard grayscale fluctuation coefficient, if so, obtaining a first standard gate regulation current corresponding to the first grayscale mean value, and applying the first standard gate regulation current during the process of the light-emitting device displaying the first preset number of frames; if not, proceeding to step S4; Step S4, dividing the first preset frame number into a plurality of continuous sub-frame numbers, so that the second grayscale fluctuation coefficient corresponding to each of the continuous sub-frame numbers is smaller than the standard grayscale fluctuation coefficient and the number of the continuous sub-frame numbers is minimized; wherein the continuous sub-frame number includes at least one frame; Step S5, obtaining a second standard gate regulation current corresponding to the second grayscale mean value of each of the continuous sub-frame numbers, and applying the second standard gate regulation current corresponding to the continuous sub-frame number when the light-emitting device displays a certain continuous sub-frame number.

2. The method for driving a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: When the unidirectional current cutoff gate structure is arranged between the cathode and the first electron transport layer, the unidirectional current cutoff gate structure includes a thin hole transport layer, a second electron transport layer and the first regulation electrode; when the unidirectional current cutoff gate structure is arranged between the first hole transport layer and the anode, the unidirectional current cutoff gate structure includes a thin electron transport layer, a second hole transport layer and the first regulation electrode.

3. The method for driving a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: The step S2 comprises: According to each of the displayed grayscale values ​​and the first grayscale mean, a first variance corresponding to the first preset number of frames is obtained, and the first variance is used as the first grayscale fluctuation coefficient; wherein the standard grayscale fluctuation coefficient is the variance.

4. The method for driving a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: The step S2 comprises: According to each of the displayed grayscale values ​​and the first grayscale mean value, a first standard deviation corresponding to the first preset frame number is obtained, and the first standard deviation is used as the first grayscale fluctuation coefficient; wherein the standard grayscale fluctuation coefficient is the standard deviation.

5. The method for driving a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: The step S2 comprises: Obtaining a second variance and a second standard deviation corresponding to the first preset number of frames according to each of the displayed grayscale values ​​and the first grayscale mean value; A first coefficient of variation is obtained according to a ratio of the second variance to the second standard deviation, and the first coefficient of variation is used as the first grayscale fluctuation coefficient; wherein the standard grayscale fluctuation coefficient is the coefficient of variation.

6. The method for driving a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: The step S3 of obtaining the first standard gate control current corresponding to the first grayscale mean value includes: Determine whether the first grayscale mean value is an integer. If so, directly obtain the corresponding first standard gate regulation current; if not, round it off to obtain the first standard gate regulation current corresponding to the rounded first grayscale mean value.

7. The method for driving a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: The step S4 further comprises: Obtaining a second grayscale mean value corresponding to each of the continuous subframes; and obtaining the second grayscale fluctuation coefficient corresponding to each of the continuous subframes according to each of the display grayscale values ​​in each of the continuous subframes and the corresponding second grayscale mean value.

8. The method for driving a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: The standard gate regulation current corresponding to each grayscale value enables the luminous efficiency of the light-emitting device at the grayscale value to meet the standard luminous efficiency.

9. The method for driving a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: The light-emitting composite layer is LED, OLED or QLED.

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