Regulation and control gate flow determination method based on one-way cut-off current gate regulation and control light-emitting device

Abstract

The invention discloses a regulation and control gate current determination method based on a one-way cut-off current gate regulation and control light-emitting device, and the method comprises the steps: applying a first driving signal corresponding to a first gray-scale value between an anode and a cathode, and applying a first gate regulation and control current to a first regulation and control electrode of a one-way cut-off current gate structure; continuously changing the first grid regulation and control current, and collecting first luminous efficiency corresponding to different first grid regulation and control current in real time; in response to matching of the first luminous efficiency and the standard luminous efficiency, determining the corresponding first grid regulation and control current as the standard grid regulation and control current of the first gray-scale value; obtaining standard grid regulation and control current corresponding to a plurality of different gray-scale values; obtaining a first function relation according to the linear relation between different gray-scale values and the corresponding standard grid regulation and control current; and according to the first function relationship, obtaining standard grid regulation and control current corresponding to each gray-scale value of the light-emitting device. According to the invention, standard grid regulation and control signals corresponding to different gray-scale values can be rapidly determined.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic display, and in particular to a method for determining a regulating gate current based on a unidirectional current-cutoff current gate regulating a light-emitting device. 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 related technologies, the amount of electron or hole injection can be controlled by voltage 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. However, in order to achieve the ideal luminous efficiency of the light-emitting device at each grayscale value through gate regulation, it is necessary to determine the standard control signal that needs to be applied for each grayscale value. However, because gate regulation will cause carrier diversion or electric field shielding, its standard control signal and grayscale value will not have a regular linear relationship, and the standard control signals corresponding to all grayscale values ​​can only be determined one by one, which is a time-consuming and labor-intensive process. Summary of the invention

[0004] In view of some 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 determining the control gate current of a light-emitting device based on a unidirectional current cutoff current gate, aiming to provide a light-emitting device that can quickly determine the standard control signal and a determination method thereof, so as to simplify the standard control signal determination process of the prior art.

[0005] To achieve the above-mentioned purpose, the present invention discloses a method for determining a control gate current based on a unidirectional current-cutoff current gate-controlled light-emitting device, which is applied to a unidirectional current-cutoff current gate-controlled light-emitting device, wherein the unidirectional current-cutoff current gate-controlled light-emitting device sequentially comprises an anode, a first hole transport layer, a light-emitting composite layer, a first electron transport layer, and a cathode, and the unidirectional current-cutoff current gate-controlled light-emitting device further comprises a unidirectional current-cutoff current gate structure, wherein the unidirectional current-cutoff current gate structure is disposed between the cathode and the first electron transport layer or between the first hole transport layer and the anode, and the unidirectional current-cutoff current gate structure regulates the unidirectional flow momentum of carriers to change the amount of carrier recombination in the light-emitting composite layer, thereby regulating the luminous efficiency of the light-emitting device; the method comprises:

[0006] Step S1, applying a first driving signal corresponding to a first grayscale value between the anode and the cathode, and applying a first gate control current to the first control electrode of the unidirectional current intercepting gate structure, and collecting the first luminous efficiency of the light-emitting device in real time; wherein, when the unidirectional current intercepting gate structure is arranged between the cathode and the first electron transport layer, the unidirectional current intercepting gate structure includes a thin hole transport layer, a second electron transport layer and the first control electrode; when the unidirectional current intercepting gate structure is arranged between the first hole transport layer and the anode, the unidirectional current intercepting gate structure includes a thin electron transport layer, a second hole transport layer and the first control electrode;

[0007] Step S2, continuously changing the first gate control current, and collecting the first luminous efficiency corresponding to each different first gate control current in real time; in response to the first luminous efficiency matching the standard luminous efficiency, determining the corresponding first gate control current as the standard gate control current of the first grayscale value;

[0008] Step S3, repeating the step S1 and the step S2 to obtain the standard gate control current corresponding to a plurality of different grayscale values;

[0009] Step S4, establishing a first coordinate system of the grayscale value of the light-emitting device and the standard gate regulation current, substituting a plurality of different grayscale values ​​and the corresponding standard gate regulation current into the first coordinate system and performing fitting to obtain a first functional relationship;

[0010] Step S5: Obtain the standard gate regulation current corresponding to each grayscale value of the light-emitting device according to the first functional relationship.

[0011] Optionally, step S3 includes:

[0012] Repeat step S1 and step S2 to obtain the standard gate regulation current corresponding to the maximum grayscale value and the intermediate grayscale value of the light-emitting device.

[0013] Optionally, the method further includes:

[0014] A second coordinate system of the grayscale value of the light-emitting device and the standard gate control current is established, and the maximum grayscale value and the intermediate grayscale value and the corresponding standard gate control current are substituted into the second coordinate system to obtain a straight line therebetween, and the straight line is determined as the first functional relationship.

[0015] Optionally, after step S2, the method further includes:

[0016] Establish a third coordinate system of the grayscale value of the light-emitting device and the standard gate regulation current, substitute the first grayscale value and its corresponding standard gate regulation current into the third coordinate system; obtain a straight line between the point and the origin of the third coordinate system, and determine the straight line as the first functional relationship.

[0017] Optionally, in step S4, a plurality of different grayscale values ​​and their corresponding standard gate control currents are substituted into the first coordinate system and fitted to obtain a first functional relationship, including:

[0018] Substituting a plurality of different grayscale values ​​and the corresponding standard gate control currents into the first coordinate system to obtain corresponding coordinate points in the first coordinate system;

[0019] A first straight line is generated so that the comprehensive distance from the first straight line to each coordinate point is the shortest; and a functional relationship corresponding to the first straight line is determined as the first functional relationship.

[0020] Optionally, in step S4, a plurality of different grayscale values ​​and their corresponding standard gate control currents are substituted into the first coordinate system and fitted to obtain a first functional relationship, including:

[0021] Step S401, substituting a plurality of different grayscale values ​​and the corresponding standard gate control currents into the first coordinate system to obtain corresponding coordinate points in the first coordinate system;

[0022] Step S402, generating corresponding straight lines to be determined between the coordinate points in pairs, and obtaining first slopes corresponding to the straight lines to be determined;

[0023] Step S403, summing and averaging the first slopes to obtain a first comprehensive slope; generating a first comprehensive straight line through the first comprehensive slope and the origin; deleting coordinate points that are greater than a first preset distance from the first comprehensive straight line;

[0024] Step S404, repeating the steps S402 and S403 until the first integrated straight line corresponding to no coordinate points greater than the first preset distance appears; and determining the functional relationship corresponding to the first integrated straight line as the first functional relationship.

[0025] Optionally, in step S2, in response to the first luminous efficiency matching the standard luminous efficiency, determining the corresponding first gate regulation current as the standard gate regulation current of the first grayscale value includes:

[0026] In response to the efficiency difference between the first luminous efficiency and the standard luminous efficiency being less than a first preset efficiency difference, the corresponding first gate regulation current is determined as a standard gate regulation current of the first grayscale value.

[0027] Optionally, step S5 includes:

[0028] Substitute each grayscale value of the light-emitting device into the first functional relationship in turn to obtain the standard gate regulation current corresponding to each grayscale value of the light-emitting device.

[0029] Optionally, the light-emitting composite layer is LED, OLED or QLED.

[0030] Optionally, when the first driving signal is applied between the anode and the cathode and the luminous efficiency of the light-emitting device is the standard luminous efficiency, the luminous brightness of the light-emitting device corresponds to the first grayscale value.

[0031] Beneficial effects of the present invention: The present invention adopts a unidirectional current cutoff current gate to regulate the light-emitting device, and the unidirectional current cutoff current gate regulated light-emitting device has a unidirectional current cutoff current gate structure, and the unidirectional current cutoff current gate structure regulates the unidirectional flow momentum of carriers to change the amount of carrier recombination in the light-emitting composite layer, thereby regulating the luminous efficiency of the light-emitting device. Compared with the gate regulation of the prior art, the carrier movement corresponding to the regulation of the unidirectional current cutoff current gate regulated light-emitting device will not cause carrier conduction or electric field shielding. Thanks to this structure, the gate regulation current of the unidirectional current cutoff current gate regulated light-emitting device of the present invention has a regular linear relationship with the grayscale value presented. Therefore, the present invention adopts a corresponding control gate current determination method as follows: applying a first driving signal corresponding to a first grayscale value between the anode and the cathode, and applying a first gate control current to a first control electrode of a unidirectional current intercepting current gate structure, and collecting a first luminous efficiency of the light-emitting device in real time; continuously changing the first gate control current, and collecting first luminous efficiencies corresponding to different first gate control currents in real time; in response to the first luminous efficiency matching the standard luminous efficiency, determining the corresponding first gate control current as a standard gate control current of a first grayscale value; obtaining standard gate control currents corresponding to a plurality of different grayscale values; establishing a first coordinate system of grayscale values ​​and standard gate control currents of the light-emitting device, substituting a plurality of different grayscale values ​​and their corresponding standard gate control currents into the first coordinate system and fitting them to obtain a first functional relationship; obtaining standard gate control currents corresponding to each grayscale value of the light-emitting device according to the first functional relationship. The present invention first collects and determines several pairs of grayscale values ​​and their corresponding standard gate control currents to solve the functional relationship between the grayscale value and the standard gate control current, and then solves the standard gate control currents corresponding to other grayscale values ​​according to the functional relationship. Compared with determining the standard control signals corresponding to all grayscale values ​​one by one through experiments, the present invention undoubtedly greatly speeds up the determination of the standard control signals and simplifies the standard control signal determination process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1It is a flow chart of a method for determining a control gate current of a light-emitting device based on a unidirectional current-cutoff current gate provided by a specific embodiment of the present invention;

[0033] 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;

[0034] 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;

[0035] Figure 4 This 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;

[0036] Figure 5 is a schematic diagram of a first functional relationship provided by a specific embodiment of the present invention

[0037] Figure 6 It is a schematic diagram of a flow chart for obtaining a first functional relationship provided by a specific embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention discloses a method for determining a control gate current of 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.

[0039] The applicant has found through research that in the relevant technology, the amount of electron or hole injection can be controlled 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. However, in order to achieve the ideal luminous efficiency of the light-emitting device at each grayscale value through gate regulation, it is necessary to determine the standard control signal that needs to be applied for each grayscale value. However, because gate regulation will cause carrier diversion or electric field shielding, its standard control signal and grayscale value will not have a regular linear relationship, and the standard control signals corresponding to all grayscale values ​​can only be determined one by one, which is a time-consuming and labor-intensive process.

[0040] Therefore, an embodiment of the present invention provides a method for determining a control gate current based on a unidirectional current-cutoff current gate-controlled light-emitting device, which is applied to a unidirectional current-cutoff current gate-controlled light-emitting device, wherein the unidirectional current-cutoff current gate-controlled light-emitting device sequentially includes an anode, a first hole transport layer, a light-emitting composite layer, a first electron transport layer, and a cathode, and the unidirectional current-cutoff current gate-controlled light-emitting device also includes a unidirectional current-cutoff current gate structure, which is arranged between the cathode and the first electron transport layer or between the first hole transport layer and the anode, and the unidirectional current-cutoff current 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 includes:

[0041] Step S1, applying a first driving signal corresponding to a first grayscale value between the anode and the cathode, applying a first gate regulating current to a first regulating electrode of a unidirectional current intercepting gate structure, and collecting a first luminous efficiency of the light-emitting device in real time.

[0042] Among them, 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.

[0043] In a specific embodiment, if 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.

[0044] In this specific embodiment, the gate control principle of the unidirectional current-cutoff gate control 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.

[0045] In another specific embodiment, Figure 3As 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.

[0046] The control principle of this embodiment is the same as that of the previous embodiment and will not be described in detail.

[0047] In this specific embodiment, when the first driving signal is applied between the anode and the cathode and the luminous efficiency of the light-emitting device is the standard luminous efficiency, the luminous brightness of the light-emitting device corresponds to the first grayscale value.

[0048] In this specific embodiment, the light emitting composite layer is an LED, an OLED or a QLED.

[0049] Step S2, continuously changing the first gate control current, and collecting the first luminous efficiency corresponding to each different first gate control current in real time; in response to the first luminous efficiency matching the standard luminous efficiency, determining the corresponding first gate control current as the standard gate control current of the first grayscale value.

[0050] In this specific embodiment, in step S2, in response to the first luminous efficiency matching the standard luminous efficiency, determining the corresponding first gate control current as the standard gate control current of the first grayscale value includes:

[0051] In response to the efficiency difference between the first light-emitting efficiency and the standard light-emitting efficiency being less than the first preset efficiency difference, the corresponding first gate regulation current is determined as the standard gate regulation current of the first grayscale value.

[0052] It should be noted that the ideal efficiency difference should be zero, that is, when the first luminous efficiency is equal to the standard luminous efficiency, the corresponding first gate control current is the standard gate control current of the first grayscale value. However, in actual application, it is often difficult to adjust the first luminous efficiency to be equal to the standard luminous efficiency. Therefore, a smaller difference is set so that the error does not exceed expectations.

[0053] In this specific embodiment, after step S2, the method further includes:

[0054] A third coordinate system of the grayscale value of the light-emitting device and the standard gate control current is established, and the first grayscale value and its corresponding standard gate control current are substituted into the third coordinate system; a straight line between the point and the origin of the third coordinate system is obtained, and the straight line is determined as the first functional relationship.

[0055] It should be noted that, because the grayscale value is proportional to the standard gate regulation current, and when the standard gate regulation current is not conducting, the grayscale value is also zero; therefore, the first functional relationship can be quickly determined from only one grayscale value and the corresponding standard gate regulation current.

[0056] Step S3, repeating step S1 and step S2 to obtain standard gate control currents corresponding to a plurality of different grayscale values.

[0057] In this specific embodiment, step S3 includes:

[0058] Repeat step S1 and step S2 to obtain the standard gate control current corresponding to the maximum grayscale value and the intermediate grayscale value of the light-emitting device.

[0059] Furthermore, the method also includes:

[0060] A second coordinate system of the grayscale value of the light-emitting device and the standard gate control current is established, and the maximum grayscale value and the intermediate grayscale value and their corresponding standard gate control current are substituted into the second coordinate system to obtain a straight line therebetween, which is determined as the first functional relationship.

[0061] It should be noted that this is a commonly used method of determining a straight line through two points. The first functional relationship can be determined by two grayscale values ​​and their corresponding standard gate control currents, and the first functional relationship is more accurate because the values ​​are located at the poles and midpoints.

[0062] Step S4, establishing a first coordinate system of the grayscale value of the light-emitting device and the standard gate control current, substituting a plurality of different grayscale values ​​and their corresponding standard gate control currents into the first coordinate system and performing fitting to obtain a first functional relationship.

[0063] In this specific embodiment, in step S4, a plurality of different grayscale values ​​and their corresponding standard gate control currents are substituted into a first coordinate system and fitted to obtain a first functional relationship, including:

[0064] Substituting a plurality of different grayscale values ​​and their corresponding standard gate control currents into the first coordinate system to obtain corresponding coordinate points in the first coordinate system;

[0065] A first straight line is generated so that the comprehensive distance from the first straight line to each coordinate point is the shortest; and a functional relationship corresponding to the first straight line is determined as a first functional relationship.

[0066] It should be noted that the accuracy of the first functional relationship can be improved by such a fitting method, so as to ensure the accuracy of the standard gate control current subsequently determined by the first functional relationship.

[0067] The first functional relationship can be expressed as Figure 5 As shown, Figure 5A coordinate point in represents a pair of collected grayscale values ​​and their corresponding standard gate control current.

[0068] In another specific embodiment, Figure 6 As shown, in step S4, a plurality of different grayscale values ​​and their corresponding standard gate control currents are substituted into a first coordinate system and fitted to obtain a first functional relationship, including:

[0069] Step S401, substituting a plurality of different grayscale values ​​and their corresponding standard gate control currents into a first coordinate system to obtain corresponding coordinate points in the first coordinate system;

[0070] Step S402, generating corresponding straight lines to be determined between any two coordinate points, and obtaining first slopes corresponding to the straight lines to be determined;

[0071] Step S403, summing and averaging the first slopes to obtain a first comprehensive slope; generating a first comprehensive straight line through the first comprehensive slope and the origin; deleting coordinate points that are greater than a first preset distance from the first comprehensive straight line;

[0072] Step S404, repeating step S402 and step S403 until no first integrated straight line corresponding to coordinate points greater than the first preset distance appears; determining the functional relationship corresponding to the first integrated straight line as the first functional relationship.

[0073] It should be noted that due to some interference, not every pair of grayscale values ​​and corresponding standard gate control current collected is accurate, so some inaccurate coordinate points are removed to generate a more accurate first functional relationship. Therefore, this embodiment can remove some inaccurate coordinate points in the above manner, and the actual first functional relationship generated by this embodiment is closer to the ideal first functional relationship than direct fitting.

[0074] Step S5: Obtaining a standard gate control current corresponding to each grayscale value of the light-emitting device according to the first functional relationship.

[0075] In this specific embodiment, step S5 includes:

[0076] Substitute each grayscale value of the light-emitting device into the first functional relationship in turn to obtain a standard gate control current corresponding to each grayscale value of the light-emitting device.

[0077] The embodiment of the present invention adopts a unidirectional current cutoff gate to regulate the light-emitting device. The unidirectional current cutoff gate to regulate the light-emitting device has a unidirectional current cutoff gate structure. The unidirectional current cutoff gate structure regulates the unidirectional flow momentum of carriers to change the amount of carrier recombination in the light-emitting composite layer, thereby regulating the luminous efficiency of the light-emitting device. Compared with the gate regulation of the prior art, the carrier movement corresponding to the regulation of the unidirectional current cutoff gate to regulate the light-emitting device will not cause carrier conduction or electric field shielding. Thanks to this structure, the gate regulation current of the unidirectional current cutoff gate to regulate the light-emitting device of the embodiment of the present invention has a regular linear relationship with the grayscale value. Therefore, the corresponding control gate current determination method adopted in the embodiment of the present invention is: applying a first driving signal corresponding to the first grayscale value between the anode and the cathode, and applying a first gate control current to the first control electrode of the unidirectional current intercepting current gate structure, and collecting the first luminous efficiency of the light-emitting device in real time; continuously changing the first gate control current, and collecting the first luminous efficiency corresponding to each different first gate control current in real time; in response to the first luminous efficiency matching the standard luminous efficiency, determining the corresponding first gate control current as the standard gate control current of the first grayscale value; obtaining the standard gate control current corresponding to multiple different grayscale values; establishing a first coordinate system of the grayscale value and the standard gate control current of the light-emitting device, substituting multiple different grayscale values ​​and their corresponding standard gate control currents into the first coordinate system and fitting them to obtain a first functional relationship; according to the first functional relationship, obtaining the standard gate control current corresponding to each grayscale value of the light-emitting device. The embodiment of the present invention first collects and determines several pairs of grayscale values ​​and their corresponding standard gate control currents to solve the functional relationship between the grayscale value and the standard gate control current, and then solves the standard gate control current corresponding to other grayscale values ​​according to the functional relationship. Compared with determining the standard control signals corresponding to all grayscale values ​​one by one through experiments, the embodiment of the present invention undoubtedly greatly speeds up the determination of the standard control signal and simplifies the standard control signal determination process.

[0078] 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.

[0079] 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.

[0080] 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 determining a control gate current of a light-emitting device based on a unidirectional current-cutoff current gate, applied to a unidirectional current-cutoff current gate controlled light-emitting device, 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, applying a first driving signal corresponding to a first grayscale value between the anode and the cathode, and applying a first gate control current to the first control electrode of the unidirectional current intercepting gate structure, and collecting the first luminous efficiency of the light-emitting device in real time; wherein, when the unidirectional current intercepting gate structure is arranged between the cathode and the first electron transport layer, the unidirectional current intercepting gate structure includes a thin hole transport layer, a second electron transport layer and the first control electrode; when the unidirectional current intercepting gate structure is arranged between the first hole transport layer and the anode, the unidirectional current intercepting gate structure includes a thin electron transport layer, a second hole transport layer and the first control electrode; Step S2, continuously changing the first gate control current, and collecting the first luminous efficiency corresponding to each different first gate control current in real time; in response to the first luminous efficiency matching the standard luminous efficiency, determining the corresponding first gate control current as the standard gate control current of the first grayscale value; Step S3, repeating the step S1 and the step S2 to obtain the standard gate control current corresponding to a plurality of different grayscale values; Step S4, establishing a first coordinate system of the grayscale value of the light-emitting device and the standard gate regulation current, substituting a plurality of different grayscale values ​​and the corresponding standard gate regulation current into the first coordinate system and performing fitting to obtain a first functional relationship; Step S5: Obtain the standard gate regulation current corresponding to each grayscale value of the light-emitting device according to the first functional relationship.

2. The method for determining the control gate current of a light-emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: The step S3 comprises: Repeat the step S1 and the step S2 to obtain the standard gate regulation current corresponding to the maximum grayscale value and the intermediate grayscale value of the light-emitting device.

3. The method for determining the control gate current of a light-emitting device based on a unidirectional current cutoff current gate according to claim 2, characterized in that: The method further comprises: A second coordinate system of the grayscale value of the light-emitting device and the standard gate control current is established, and the maximum grayscale value and the intermediate grayscale value and the corresponding standard gate control current are substituted into the second coordinate system to obtain a straight line therebetween, and the straight line is determined as the first functional relationship.

4. The method for determining the control gate current of a light-emitting device based on a unidirectional current cutoff current gate according to claim 1, characterized in that: After step S2, the method further comprises: Establish a third coordinate system of the grayscale value of the light-emitting device and the standard gate regulation current, substitute the first grayscale value and its corresponding standard gate regulation current into the third coordinate system; obtain a straight line between the point and the origin of the third coordinate system, and determine the straight line as the first functional relationship.

5. The method for determining the control gate current of a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: In step S4, a plurality of different grayscale values ​​and their corresponding standard gate control currents are substituted into the first coordinate system and fitted to obtain a first functional relationship, including: Substituting a plurality of different grayscale values ​​and the corresponding standard gate control currents into the first coordinate system to obtain corresponding coordinate points in the first coordinate system; A first straight line is generated so that the comprehensive distance from the first straight line to each coordinate point is the shortest; and a functional relationship corresponding to the first straight line is determined as the first functional relationship.

6. The method for determining the control gate current of a light-emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: In step S4, a plurality of different grayscale values ​​and their corresponding standard gate control currents are substituted into the first coordinate system and fitted to obtain a first functional relationship, including: Step S401, substituting a plurality of different grayscale values ​​and the corresponding standard gate control currents into the first coordinate system to obtain corresponding coordinate points in the first coordinate system; Step S402, generating corresponding straight lines to be determined between the coordinate points in pairs, and obtaining first slopes corresponding to the straight lines to be determined; Step S403, summing and averaging the first slopes to obtain a first comprehensive slope; generating a first comprehensive straight line through the first comprehensive slope and the origin; deleting coordinate points that are greater than a first preset distance from the first comprehensive straight line; Step S404, repeating the steps S402 and S403 until the first integrated straight line corresponding to no coordinate points greater than the first preset distance appears; and determining the functional relationship corresponding to the first integrated straight line as the first functional relationship.

7. The method for determining the control gate current of a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: In the step S2, in response to the first luminous efficiency matching the standard luminous efficiency, determining the corresponding first gate regulation current as the standard gate regulation current of the first grayscale value includes: In response to the efficiency difference between the first luminous efficiency and the standard luminous efficiency being less than a first preset efficiency difference, the corresponding first gate regulation current is determined as a standard gate regulation current of the first grayscale value.

8. The method for determining the control gate current of a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: The step S5 comprises: Substitute each grayscale value of the light-emitting device into the first functional relationship in turn to obtain the standard gate regulation current corresponding to each grayscale value of the light-emitting device.

9. The method for determining the control gate current of 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.

10. The method for determining the control gate current of a light emitting device based on a unidirectional current cutoff gate according to claim 1, characterized in that: When the first driving signal is applied between the anode and the cathode and the light emitting efficiency of the light emitting device is the standard light emitting efficiency, the light emitting brightness of the light emitting device corresponds to the first grayscale value.

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