A method for determining a control gate current of a light-emitting device based on a unidirectional current-cutoff gate

Abstract

The present invention discloses a method for determining a control gate current of a light-emitting device based on a unidirectional current-cutoff gate, comprising: applying a first drive signal corresponding to a first grayscale value between an anode and a cathode, and applying a first gate control current to a first control electrode of the unidirectional current-cutoff gate structure; 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 a 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 multiple different grayscale values; obtaining a first functional relationship based on a linear relationship between different grayscale values ​​and their corresponding standard gate control currents; and obtaining the standard gate control current corresponding to each grayscale value of the light-emitting device based on the first functional relationship. The present invention can quickly determine the standard gate control signal corresponding to different grayscale values.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic display, and in particular to a method for determining a control gate current of a light-emitting device based on a unidirectional current-cutoff current gate. 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, resulting in a serious imbalance of charge carriers in the light-emitting layer of QLED devices. This imbalance not only makes it difficult for free charge carriers to achieve ideal efficiency when recombinating, 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 prevalent in organic light-emitting diode (OLED) devices, becoming 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 may cause carrier diversion or electric field shielding, its standard control signal and grayscale value will not have a regular linear relationship. The standard control signal 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 objectives, 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 further 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 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 includes:

[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 for the first grayscale value;

[0008] Step S3, repeating step S1 and 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 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;

[0010] Step S5: Obtain the standard gate control 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] Establish a second coordinate system of the grayscale value of the light-emitting device and the standard gate control current, substitute the maximum grayscale value and the intermediate grayscale value and the corresponding standard gate control current into the second coordinate system, obtain a straight line between the two, and determine the straight line 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 control current, substitute the first grayscale value and its corresponding standard gate control current into the third coordinate system; obtain a straight line between this 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: Substitute 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 each of the coordinate points, and obtaining a first slope corresponding to each straight line to be determined;

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

[0024] 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.

[0025] Optionally, 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:

[0026] In response to an efficiency difference between the first luminous efficiency and the standard luminous efficiency being smaller 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 sequence to obtain the standard gate control 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 Invention: The present invention utilizes a unidirectional current-cutoff gate to regulate a light-emitting device. This unidirectional current-cutoff gate-regulated light-emitting device has a unidirectional current-cutoff gate structure. The unidirectional current-cutoff gate structure regulates the unidirectional flow of carriers to change the amount of carrier recombination within the light-emitting composite layer, thereby regulating the luminous efficiency of the light-emitting device. Compared to gate regulation in the prior art, the carrier movement corresponding to the regulation of the unidirectional current-cutoff gate-regulated light-emitting device does not result in carrier diversion or electric field shielding. Thanks to this structure, the gate-regulated current of the unidirectional current-cutoff 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 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; 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 the 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 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 ​​based on 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 1This is a flow chart of a method for determining a control gate current of a light-emitting device based on a unidirectional current-cutoff gate, provided by a specific embodiment of the present invention;

[0033] Figure 2 This is a structural diagram of a unidirectional current-cutoff current gate-controlled light-emitting device provided by a specific embodiment of the present invention;

[0034] Figure 3 This is a structural diagram of a unidirectional current-cutoff current gate-controlled 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 gate regulating the movement of carriers in a light-emitting device provided by a specific embodiment of the present invention;

[0036] Figure 5 This 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 noted in particular that all similar replacements and modifications are obvious to those skilled in the art and are considered 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 discovered that in related technologies, 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 ideal luminous efficiency for each grayscale value of the light-emitting device 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 may cause carrier diversion or electric field shielding, its standard control signal and grayscale value will not form a regular linear relationship. The standard control signal 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. The unidirectional current-cutoff current gate-controlled 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 current gate-controlled light-emitting device also includes a unidirectional current-cutoff current gate structure. The unidirectional current-cutoff current 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 current gate structure adjusts 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 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 control current to a first control 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-cutting gate structure is arranged between the cathode and the first electron transport layer, the unidirectional current-cutting gate structure includes a thin hole transport layer, a second electron transport layer and a first control electrode; when the unidirectional current-cutting gate structure is arranged between the first hole transport layer and the anode, the unidirectional current-cutting gate structure includes a thin electron transport layer, a second hole transport layer and a first control electrode.

[0043] In a specific embodiment, if Figure 2 As shown, the unidirectional current-cutoff current gate-controlled 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 control 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 control 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, and the cathode electrons are controlled by the control 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, while the holes on the anode 201 are also injected into the light-emitting composite layer 203; at this time, the first gate control current applied by the first control 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-controlled 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 control electrode 210.

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

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

[0048] In this 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 an efficiency difference between the first luminous efficiency and the standard luminous efficiency being smaller than a first preset efficiency difference, the corresponding first gate regulation current is determined as a standard gate regulation current of a 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 for the first grayscale value. However, in actual applications, it is often difficult to adjust the first luminous efficiency to be equal to the standard luminous efficiency. Therefore, a small difference is set to ensure that the error does not exceed the expected value.

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

[0054] Establish a third coordinate system of the grayscale value of the light-emitting device and the standard gate control current, substitute the first grayscale value and its corresponding standard gate control 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.

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

[0056] Step S3: repeat step S1 and step S2 to obtain standard gate control currents corresponding to multiple 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 further comprises:

[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, the intermediate grayscale value and the corresponding standard gate control current are substituted into the second coordinate system to obtain a straight line between the two, and the straight line 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 extremes 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 a 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 such a fitting method can improve the accuracy of the first functional relationship, 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 the first coordinate system and fitted to obtain a first functional relationship, including:

[0069] Step S401: Substitute 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: Generate corresponding lines to be determined between any two coordinate points, and obtain the first slope corresponding to each line to be determined;

[0071] Step S403: summing and averaging the first slopes to obtain a first integrated slope; generating a first integrated straight line using the first integrated slopes and the origin; and deleting coordinate points that are greater than a first preset distance from the first integrated 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 certain interference, not every pair of grayscale values ​​and corresponding standard gate control currents collected is accurate. Therefore, some inaccurate coordinate points are removed to generate a more accurate first functional relationship. Therefore, this embodiment can remove some inaccurate coordinate points through the above method. Compared with direct fitting, the actual first functional relationship generated by this embodiment is closer to the ideal first functional relationship.

[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 sequence to obtain a standard gate control current corresponding to each grayscale value of the light-emitting device.

[0077] Embodiments of the present invention utilize a unidirectional current-cutoff gate-controlled light-emitting device. This unidirectional current-cutoff gate-controlled light-emitting device has a unidirectional current-cutoff gate structure. This unidirectional current-cutoff gate structure regulates the unidirectional flow of carriers to change the amount of carrier recombination within the light-emitting composite layer, thereby regulating the luminous efficiency of the light-emitting device. Compared to gate-controlled light-emitting devices in the prior art, the carrier movement corresponding to the control of the unidirectional current-cutoff gate-controlled light-emitting device does not cause carrier diversion or electric field shielding. Thanks to this structure, the gate-controlled current of the unidirectional current-cutoff gate-controlled light-emitting device in the embodiment of the present invention has a regular linear relationship between the gate-controlled current and the displayed grayscale value. Therefore, the corresponding gate control current determination method adopted in the embodiment of the present invention is as follows: applying a first driving signal corresponding to a first grayscale value between the anode and the cathode, 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; 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 the 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; obtaining the standard gate control current corresponding to each grayscale value of the light-emitting device according to the first functional relationship. 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 ​​based on 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 document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0079] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A method for determining a control gate current of a light-emitting device controlled by 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 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. The unidirectional current-cutoff current gate-controlled light-emitting device further comprises 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. The unidirectional current-cutoff current gate structure regulates the unidirectional flow 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: 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 for the first grayscale value; Step S3, repeating step S1 and 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 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; Step S5: obtaining the standard gate control current corresponding to each grayscale value of the light-emitting device according to the first functional relationship; The step S3 comprises: Repeating 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; The method further comprises: Establishing a second coordinate system of the grayscale value of the light-emitting device and the standard gate control current, substituting the maximum grayscale value and the intermediate grayscale value and the corresponding standard gate control current into the second coordinate system to obtain a straight line therebetween, and determining the straight line as the first functional relationship; After step S2, the method further includes: Establish a third coordinate system for the grayscale value of the light-emitting device and the standard gate control current, and substitute the first grayscale value and the corresponding standard gate control current into the third coordinate system; obtain a straight line between the coordinate points corresponding to the first grayscale value and the standard gate control current and the origin of the third coordinate system, and determine the straight line as the first functional relationship.

2. The method for determining the 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.

3. The method for determining the 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: Substitute 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 each of the coordinate points, and obtaining a first slope corresponding to each straight line to be determined; Step S403: summing and averaging the first slopes to obtain a first integrated slope; generating a first integrated straight line using the first integrated slopes and the origin; and deleting coordinate points that are greater than a first preset distance from the first integrated straight line. 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.

4. The method for determining the gate current of a light-emitting device based on a unidirectional current-cutoff gate according to claim 1, characterized in that: 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: In response to an efficiency difference between the first luminous efficiency and the standard luminous efficiency being smaller 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.

5. The method for determining the gate current of a light-emitting device controlled by 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 sequence to obtain the standard gate control current corresponding to each grayscale value of the light-emitting device.

6. The method for determining the 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.

7. The method for determining the 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 luminous efficiency of the light-emitting device is the standard luminous efficiency, the luminance of the light-emitting device corresponds to the first grayscale value.

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