A method for determining driving current of a gate-controlled stacked structure light-emitting device

Abstract

The present invention discloses a method for determining the driving current of a gate-controlled stacked structure light-emitting device, comprising: controlling a first power supply to apply a gradually varying first current to the light-emitting device when the gate voltage is removed from the gate control electrode, and collecting the luminance of the light-emitting device in real time to obtain a first functional relationship graph; similarly obtaining a second functional relationship graph when different test gate voltages are applied to the gate control electrode; obtaining a threshold grayscale based on the first and second functional relationship graphs; determining whether the desired grayscale value of the light-emitting device to be determined is less than the threshold grayscale; if so, controlling the gate control electrode to apply a fixed first gate voltage to the first electrode and / or the second electrode, controlling the first power supply to apply a third current to the light-emitting device, and continuously adjusting the third current; and determining the current third current as the standard driving current for the desired grayscale value in response to the luminance of the light-emitting device meeting the desired grayscale value. The present invention improves the efficiency of determining the driving current.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic display, and in particular to a method for determining the driving current of a gate-regulated stacked structure light-emitting device. Background Art

[0002] Light-emitting devices (LEDs) in optoelectronic displays are a crucial component of display devices, presenting images or information through light. The principle of light emission in many devices is based on the fact that, upon application of power, electrons and holes combine in the light-emitting layer to form excitons. When these excitons recombine, they release energy and emit light. Examples include QLEDs (quantum dot light-emitting diodes) and OLEDs (organic light-emitting diodes). These devices offer advantages such as rich color reproduction, high contrast, fast response, wide viewing angles, and energy conservation and environmental protection. The luminous efficiency or brightness of these devices is significantly affected by the carrier recombination process. Optimal device efficiency is typically achieved by combining different functional layers and quantum dots, a process that requires significant time, materials, and labor. Therefore, gate control has emerged. This technology allows for the creation of a built-in electric field within these devices, enabling the regulation of carrier mobility and, consequently, luminous efficiency or brightness. This improves luminous efficiency and brightness, eliminating the need to rely solely on material combinations to achieve optimal device efficiency.

[0003] In gate control, different combinations of drive current and gate voltage are typically used to achieve a desired brightness while improving luminous efficiency. This combination of drive current and gate voltage requires repeated experimentation. This results in a large number of grayscale values ​​requiring extensive experimentation to determine the corresponding drive current, which in turn reduces the efficiency of light-emitting device fabrication. Summary of the Invention

[0004] In view of some of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a method for determining the driving current of a gate-regulated stacked structure light-emitting device, aiming to improve the efficiency of determining the driving current.

[0005] To achieve the above objectives, the present invention provides a method for determining the driving current of a gate-regulated stacked structure light-emitting device, the method comprising: applying to a gate-regulated stacked structure light-emitting device, the light-emitting device comprising a light-emitting unit, a gate insulating layer, and a gate regulation electrode; the light-emitting unit sequentially comprising a first electrode, a light-emitting functional layer, and a second electrode; applying a first power supply to the first electrode and the second electrode, the first power supply being used to power the light-emitting unit to emit light; applying a gate voltage relative to the first electrode and / or the second electrode, the gate voltage being used to construct an electric field to regulate the mobility of carriers within the light-emitting unit and thereby adjust the luminous efficiency and luminous brightness of the light-emitting unit; the method comprising:

[0006] Step S1: When the gate voltage is removed from the gate control electrode, controlling the first power supply to apply a gradually changing first current to the light-emitting device, and collecting the luminance of the light-emitting device in real time to obtain a first functional relationship graph; wherein the first functional relationship graph is a functional relationship in which the luminance of the light-emitting device changes with the first current;

[0007] Step S2: When different test gate voltages are applied to the gate control electrode, controlling the first power supply to apply a gradually changing second current to the light-emitting device, and collecting the luminance of the light-emitting device in real time to obtain a second functional relationship graph under each different test gate voltage; wherein the second functional relationship graph is a functional relationship in which the luminance of the light-emitting device changes as the second current changes;

[0008] Step S3: obtaining a threshold grayscale according to the first function relationship diagram and the second function relationship diagram;

[0009] Step S4, judging whether the required grayscale value to be determined of the light emitting device is less than the threshold grayscale, if so, proceeding to step S5; if not, proceeding to step S6;

[0010] Step S5: controlling the gate control electrode to apply a fixed first gate voltage to the first electrode and / or the second electrode, controlling the first power supply to apply a third current to the light-emitting device, and continuously adjusting the third current; in response to the luminance of the light-emitting device meeting the required grayscale value, determining the current third current as a standard driving current for the required grayscale value;

[0011] Step S6, control the first power supply to apply a fourth current to the light-emitting device, control the gate control electrode to apply a second gate voltage to the first electrode and / or the second electrode, and continuously adjust the fourth current and the second gate voltage; in response to the luminous brightness of the light-emitting device meeting the required grayscale value and the luminous efficiency of the light-emitting device meeting the required efficiency, determine the current fourth current as the standard driving current of the required grayscale value.

[0012] Optionally, step S3 includes:

[0013] According to the first function relationship diagram and the second function relationship diagram, a matching interval in which the grayscale difference under the same current is lower than the preset difference is obtained; and a maximum grayscale value corresponding to the matching interval is determined as the threshold grayscale.

[0014] Optionally, step S5 includes:

[0015] According to the first functional relationship diagram, determining a current corresponding to the required grayscale value in the first functional relationship diagram as the third current;

[0016] Controlling the gate control electrode to apply a fixed first gate voltage to the first electrode and / or the second electrode; controlling the first power supply to apply a third current to the light-emitting device, and continuously adjusting the third current;

[0017] In response to the light emitting brightness of the light emitting device meeting the required grayscale value, the current third current is determined as a standard driving current of the required grayscale value.

[0018] Optionally, step S6 includes:

[0019] According to the first functional relationship diagram, determining a current corresponding to the required grayscale value in the first functional relationship diagram as the fourth current;

[0020] Control the first power supply to apply a fourth current to the light-emitting device, control the gate control electrode to apply a second gate voltage to the first electrode and / or the second electrode, and continuously adjust the fourth current and the second gate voltage; in response to the luminous brightness of the light-emitting device meeting the required grayscale value and the luminous efficiency of the light-emitting device meeting the required efficiency, determine the current fourth current as the standard driving current of the required grayscale value.

[0021] Optionally, in step S6, the method further includes:

[0022] In response to the luminance of the light emitting device meeting the required grayscale value and the luminous efficiency of the light emitting device meeting the required efficiency, the current second gate voltage is determined as a standard driving gate voltage of the required grayscale value.

[0023] Optionally, when the light-emitting device is in use, the method includes:

[0024] Obtaining a display grayscale value of the light-emitting device, and obtaining the corresponding standard driving current according to the display grayscale value; obtaining a corresponding standard driving gate voltage according to the standard driving current; wherein, when the display grayscale value is less than the threshold grayscale, the standard driving gate voltage is the same gate voltage;

[0025] The first power supply is controlled to apply the standard driving current to the light emitting device, and the gate control electrode is controlled to apply the standard driving gate voltage to the first electrode and / or the second electrode.

[0026] Optionally, the light-emitting device is a quantum dot light-emitting diode, and the light-emitting functional layer includes a hole transport layer, a quantum dot light-emitting layer and an electron transport layer.

[0027] Optionally, the light-emitting device is an organic light-emitting diode, and the light-emitting functional layer includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer and an electron injection layer.

[0028] Beneficial effects of the present invention: The present invention divides the required grayscale values ​​that need to determine the driving current into two parts through the threshold grayscale. Because the gate voltage has a subtle effect on the brightness of the required grayscale values ​​that are smaller than the threshold grayscale, more experiments are required to make the driving current and driving gate voltage corresponding to this part of the required grayscale values ​​meet the brightness and efficiency requirements at the same time. However, the brightness of this part of the required grayscale values ​​themselves is relatively low, and even if the optimal efficiency is achieved, the energy saved is relatively small. Therefore, when determining the driving current for the required grayscale values ​​that are smaller than the threshold grayscale, the present invention applies a fixed gate voltage and only changes the current to achieve the purpose of determining the driving current. Compared with the driving current determination method that guarantees the luminous efficiency of all required grayscale values, the present invention can greatly reduce the driving time of the driving current corresponding to some required grayscale values, and improve the overall driving current determination efficiency.

[0029] In summary, the present invention divides the required grayscale values ​​by threshold grayscale, and adopts different determination methods for the driving current of different grayscale values. While ensuring that the light-emitting device saves energy, the efficiency of determining the driving current is improved, thereby improving the preparation efficiency of the light-emitting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a flow chart of a method for determining the driving current of a gate-controlled stacked structure light-emitting device provided by a specific embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the control results of a gate-controlled stacked structure light-emitting device under different gate voltages provided by a specific embodiment of the present invention;

[0032] Figure 3 1 is a schematic structural diagram of a gate-controlled stacked structure light-emitting device provided in a first specific embodiment of the present invention;

[0033] Figure 4 1 is a schematic structural diagram of a gate-controlled stacked structure light-emitting device provided in a second specific embodiment of the present invention;

[0034] Figure 5 1 is a schematic structural diagram of a gate-controlled stacked structure light-emitting device provided in a third specific embodiment of the present invention;

[0035] Figure 6 It is a schematic structural diagram of a gate-regulated stacked structure light-emitting device provided in the fourth specific embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention discloses a method for determining the driving current of a gate-regulated stacked-structure light-emitting device. Those skilled in the art may refer to the contents of this document and appropriately improve the technical details for implementation. It is particularly important to note that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in the present invention. The methods and applications of the present invention have been described through preferred embodiments. It is obvious that relevant persons can 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.

[0037] The applicant has found through research that: in gate regulation, different combinations of driving currents and gate voltages are generally used to improve the luminous efficiency while achieving a preset luminous brightness. The combination of driving current and gate voltage needs to be obtained through repeated experiments. This results in that when there are many grayscale values, a large number of experiments are required to determine the driving current corresponding to each grayscale value, thereby reducing the preparation efficiency of the light-emitting device. The applicant has found through experiments that when the luminous brightness of the light-emitting device is lower than a certain value, the size of its gate voltage has a slight effect on the luminous brightness. Therefore, it takes more experiments to obtain the driving current and gate voltage combination for luminous brightness below this value, which is time-consuming and laborious; and these luminous brightnesses consume less energy overall, and even if the best luminous efficiency is achieved, the energy saved is relatively small, and thus there is little necessity to obtain the driving current and gate voltage combination.

[0038] Therefore, an embodiment of the present invention provides a method for determining the driving current of a gate-regulated stacked structure light-emitting device, which is applied to a gate-regulated stacked structure light-emitting device, wherein the light-emitting device includes a light-emitting unit, a gate insulating layer, and a gate regulation electrode; the light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode in sequence; a first power supply is applied to the first electrode and the second electrode, and the first power supply is used to power the light-emitting unit to emit light; the gate regulation electrode applies a gate voltage relative to the first electrode and / or the second electrode, and the gate voltage is used to construct an electric field to regulate the mobility of carriers in the light-emitting unit and adjust the luminous efficiency and luminous brightness of the light-emitting unit; Figure 1 As shown, the method includes:

[0039] Step S1: When the gate voltage is removed from the gate control electrode, the first power supply is controlled to apply a gradually changing first current to the light emitting device, and the luminance of the light emitting device is collected in real time to obtain a first functional relationship diagram.

[0040] The first functional relationship diagram is a functional relationship in which the luminance of the light-emitting device changes with the first current.

[0041] It should be noted that typical light-emitting devices require 256 grayscale values ​​for display, and there is a direct linear relationship between grayscale value and luminous brightness: higher grayscale values ​​correspond to higher brightness, while lower grayscale values ​​correspond to lower brightness. This relationship allows for precise control of image brightness by adjusting grayscale values, making it a key method for adjusting image contrast and brightness in image processing.

[0042] Step S2: When different test gate voltages are applied to the gate control electrode, the first power supply is controlled to apply a gradually changing second current to the light emitting device, and the luminance of the light emitting device is collected in real time to obtain a second functional relationship diagram under different test gate voltages.

[0043] The second functional relationship diagram is a functional relationship in which the luminance of the light-emitting device changes with the second current.

[0044] It should be noted that the second functional relationship diagram may have multiple corresponding test gate voltages.

[0045] In this specific embodiment, the first function relationship diagram and a second function relationship diagram can be as follows: Figure 2 As shown, the first functional relationship and the second functional relationship are located in the same coordinates and can also be as shown in Figure 2 shown.

[0046] Step S3: Obtaining a threshold grayscale according to the first function relationship diagram and the second function relationship diagram.

[0047] In this specific embodiment, step S3 includes:

[0048] According to the first function relationship diagram and the second function relationship diagram, a matching interval in which the grayscale difference is lower than the preset difference under the same current is obtained; and a maximum grayscale value corresponding to the matching interval is determined as a threshold grayscale.

[0049] It should be noted that the threshold grayscale is based on the first function relationship diagram, that is, at a certain same current, the grayscale difference between the first function and the second function just reaches a critical value, and the grayscale value of the first function at this time is obtained as the threshold grayscale.

[0050] The minimum grayscale value in the matching range should be zero. In general, the smaller the current, the smaller the grayscale difference. The threshold grayscale can be as follows: Figure 2 shown.

[0051] Step S4: determine whether the required grayscale value to be determined of the light-emitting device is less than the threshold grayscale. If so, proceed to step S5; if not, proceed to step S6.

[0052] It should be noted that when the required grayscale value is less than the threshold grayscale, it means that the gate voltage corresponding to the required grayscale value has a subtle effect on its luminous brightness, which leads to the need for a more detailed division of current and gate voltage groups to achieve the best luminous efficiency. Therefore, when matching its optimal gate voltage to achieve the best luminous efficiency, more sets of current and gate voltage combinations are required, which makes it time-consuming to determine the driving current for the required grayscale value less than the threshold grayscale. However, since this part of the required grayscale value corresponds to low brightness and low energy consumption, even at the best luminous efficiency, the energy saved is relatively small. Using a more common gate voltage to ensure that all required grayscale values ​​less than the threshold grayscale can have a good luminous efficiency can greatly improve efficiency by not conducting combination experiments on current and gate voltage.

[0053] Step S5, control the gate regulation to apply a fixed first gate voltage to the first electrode and / or the second electrode, control the first power supply to apply a third current to the light-emitting device, and continuously adjust the third current; in response to the luminance of the light-emitting device meeting the required grayscale value, determine the current third current as the standard driving current of the required grayscale value.

[0054] It should be noted that the first gate voltage is a common driving gate voltage obtained through experiments to ensure that all required grayscale values ​​of the light-emitting device below the threshold grayscale have good luminous efficiency. In this embodiment, only the current needs to be changed to determine the driving current, which greatly improves the efficiency of determining the driving current and thus improves the overall manufacturing efficiency of the light-emitting device.

[0055] In this specific embodiment, step S5 includes:

[0056] According to the first functional relationship diagram, the current corresponding to the required grayscale value in the first functional relationship diagram is determined as the third current;

[0057] Controlling the gate to apply a fixed first gate voltage to the first electrode and / or the second electrode; controlling the first power supply to apply a third current to the light-emitting device, and continuously adjusting the third current;

[0058] In response to the light emitting brightness of the light emitting device meeting the required grayscale value, the current third current is determined as the standard driving current of the required grayscale value.

[0059] It should be noted that, in order to reduce blindness in the process of determining the driving current, the embodiment of the present invention determines a starting third current as a basis.

[0060] Step S6, control the first power supply to apply a fourth current to the light-emitting device, control the gate regulation to apply a second gate voltage to the first electrode and / or the second electrode, and continuously adjust the fourth current and the second gate voltage; in response to the luminous brightness of the light-emitting device meeting the required grayscale value and the luminous efficiency of the light-emitting device meeting the required efficiency, determine the current fourth current as the standard driving current of the required grayscale value.

[0061] It should be noted that when the required grayscale value is greater than or equal to the threshold grayscale, it means that the gate voltage corresponding to the required grayscale value has a greater impact on its luminous brightness, and the brightness of this part of the required grayscale value is also greater. Therefore, it is necessary to conduct a combination experiment of current and gate voltage to obtain the best driving current and driving gate voltage to ensure that the luminous efficiency reaches the ideal state.

[0062] Step S6 includes:

[0063] According to the first functional relationship diagram, determining the current corresponding to the required grayscale value in the first functional relationship diagram as the fourth current;

[0064] Control the first power supply to apply a fourth current to the light-emitting device, control the gate regulation to apply a second gate voltage to the first electrode and / or the second electrode, and continuously adjust the fourth current and the second gate voltage; in response to the luminous brightness of the light-emitting device meeting the required grayscale value and the luminous efficiency of the light-emitting device meeting the required efficiency, determine the current fourth current as the standard driving current of the required grayscale value.

[0065] Similarly, in order to reduce blindness in the process of determining the driving current, the embodiment of the present invention determines a starting fourth current as a basis.

[0066] In this specific embodiment, in step S6, the method further includes:

[0067] In response to the light emitting brightness of the light emitting device meeting the required grayscale value and the light emitting efficiency of the light emitting device meeting the required efficiency, the current second gate voltage is determined as the standard driving gate voltage of the required grayscale value.

[0068] In this specific embodiment, the method includes:

[0069] Obtaining a display grayscale value of the light-emitting device, and obtaining a corresponding standard driving current according to the display grayscale value; obtaining a corresponding standard driving gate voltage according to the standard driving current; wherein, when the display grayscale value is less than a threshold grayscale, the standard driving gate voltage is the same gate voltage;

[0070] The first power supply is controlled to apply a standard driving current to the light emitting device, and the gate regulating electrode is controlled to apply a standard driving gate voltage to the first electrode and / or the second electrode.

[0071] It should be noted that, during the driving process, the corresponding driving current and driving gate voltage can also be quickly found through the threshold grayscale.

[0072] In this specific embodiment, the light-emitting device is a quantum dot light-emitting diode, and the light-emitting functional layer includes a hole transport layer, a quantum dot light-emitting layer, and an electron transport layer.

[0073] QLED (Quantum Dot Light Emitting Diode) has certain advantages over general light-emitting devices in terms of brightness, color gamut and service life.

[0074] In another specific embodiment, the light-emitting device is an organic light-emitting diode, and the light-emitting functional layer includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer.

[0075] OLED (Organic Light Emitting Diode) has certain advantages over general light-emitting devices in terms of contrast and viewing angle.

[0076] In the first specific embodiment, as Figure 3 As shown, when the gate control electrode is located on the side of the second electrode, the second electrode is connected to the negative electrode of the first power supply, and the majority carriers of the light-emitting device are electrons, it is necessary to increase the luminous efficiency by making the gate control electrode apply a positive first light-emitting gate voltage to the second electrode.

[0077] It should be noted that when the OLED / QLED light-emitting functional layer of this embodiment is a QLED, the light-emitting functional layer includes a hole transport layer, a quantum dot light-emitting layer, and an electron transport layer. When the OLED / QLED light-emitting functional layer of this embodiment is an OLED, the light-emitting functional layer includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer.

[0078] In the second specific embodiment, Figure 4 As shown, when the gate control electrode is located on one side of the first electrode, the first electrode is connected to the positive electrode of the first power supply, and the majority carriers of the light-emitting device are holes, it is necessary to increase the luminous efficiency by applying a negative first light-emitting gate voltage to the first electrode.

[0079] It should be noted that when the OLED / QLED light-emitting functional layer of this embodiment is a QLED, the light-emitting functional layer includes a hole transport layer, a quantum dot light-emitting layer, and an electron transport layer. When the OLED / QLED light-emitting functional layer of this embodiment is an OLED, the light-emitting functional layer includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer.

[0080] In the third specific embodiment, Figure 5 As shown, when the gate control electrode is located on the side of the second electrode, the second electrode is connected to the negative electrode of the first power supply, and the majority carriers of the light-emitting device are holes, it is necessary to increase the luminous efficiency by causing the gate control electrode to apply a negative first light-emitting gate voltage to the second electrode.

[0081] It should be noted that when the OLED / QLED light-emitting functional layer of this embodiment is a QLED, the light-emitting functional layer includes a hole transport layer, a quantum dot light-emitting layer, and an electron transport layer. When the OLED / QLED light-emitting functional layer of this embodiment is an OLED, the light-emitting functional layer includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer.

[0082] In the fourth specific embodiment, Figure 6 As shown, when the gate control electrode is located on one side of the first electrode, the first electrode is connected to the positive electrode of the first power supply, and the majority carriers of the light-emitting device are electrons, it is necessary to increase the luminous efficiency by causing the gate control electrode to apply a positive first light-emitting gate voltage to the first electrode.

[0083] It should be noted that when the OLED / QLED light-emitting functional layer of this embodiment is a QLED, the light-emitting functional layer includes a hole transport layer, a quantum dot light-emitting layer, and an electron transport layer. When the OLED / QLED light-emitting functional layer of this embodiment is an OLED, the light-emitting functional layer includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer.

[0084] The embodiment of the present invention divides the required grayscale values ​​that need to determine the driving current into two parts through the threshold grayscale. Because the gate voltage has a subtle effect on the brightness of the required grayscale values ​​that are smaller than the threshold grayscale, more experiments are required to make the driving current and driving gate voltage corresponding to this part of the required grayscale values ​​meet the brightness and efficiency requirements at the same time. However, the brightness of this part of the required grayscale values ​​themselves is relatively low, and even if the optimal efficiency is achieved, the energy saved is relatively small. Therefore, when determining the driving current for the required grayscale values ​​that are smaller than the threshold grayscale, the embodiment of the present invention applies a fixed gate voltage and only changes the current to achieve the purpose of determining the driving current. Compared with the driving current determination method that guarantees the luminous efficiency of all required grayscale values, the embodiment of the present invention can greatly reduce the driving time of the driving current corresponding to some required grayscale values, thereby improving the overall driving current determination efficiency.

[0085] In summary, the embodiments of the present invention divide the required grayscale values ​​by threshold grayscale, and adopt different determination methods for the driving current of different grayscale values. While ensuring that the light-emitting device saves energy, the efficiency of determining the driving current is improved, thereby improving the preparation efficiency of the light-emitting device.

[0086] 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.

[0087] 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.

[0088] 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 the driving current of a gate-regulated stacked structure light-emitting device, applied to a gate-regulated stacked structure light-emitting device, characterized in that: The light-emitting device includes a light-emitting unit, a gate insulating layer, and a gate control electrode; the light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode in sequence; a first power supply is applied to the first electrode and the second electrode, the first power supply is used to power the light-emitting unit to emit light, and the gate control electrode applies a gate voltage relative to the first electrode and / or the second electrode, the gate voltage is used to construct an electric field to control the mobility of carriers in the light-emitting unit to adjust the luminous efficiency and luminous brightness of the light-emitting unit; the method includes: Step S1: When the gate voltage is removed from the gate control electrode, controlling the first power supply to apply a gradually changing first current to the light-emitting device, and collecting the luminance of the light-emitting device in real time to obtain a first functional relationship graph; wherein the first functional relationship graph is a functional relationship in which the luminance of the light-emitting device changes with the first current; Step S2: When different test gate voltages are applied to the gate control electrode, controlling the first power supply to apply a gradually changing second current to the light-emitting device, and collecting the luminance of the light-emitting device in real time to obtain a second functional relationship graph under each different test gate voltage; wherein the second functional relationship graph is a functional relationship in which the luminance of the light-emitting device changes as the second current changes; Step S3: obtaining a threshold grayscale according to the first function relationship diagram and the second function relationship diagram; Step S4, judging whether the required grayscale value to be determined of the light emitting device is less than the threshold grayscale, if so, proceeding to step S5; if not, proceeding to step S6; Step S5: controlling the gate control electrode to apply a fixed first gate voltage to the first electrode and / or the second electrode, controlling the first power supply to apply a third current to the light-emitting device, and continuously adjusting the third current; in response to the luminance of the light-emitting device meeting the required grayscale value, determining the current third current as a standard driving current for the required grayscale value; Step S6: controlling the first power supply to apply a fourth current to the light-emitting device, controlling the gate control electrode to apply a second gate voltage to the first electrode and / or the second electrode, and continuously adjusting the fourth current and the second gate voltage; in response to the luminance of the light-emitting device meeting the required grayscale value and the luminous efficiency of the light-emitting device meeting the required efficiency, determining the current fourth current as the standard driving current for the required grayscale value; Wherein, the step S3 includes: According to the first function relationship diagram and the second function relationship diagram, a matching interval in which the grayscale difference under the same current is lower than the preset difference is obtained; and a maximum grayscale value corresponding to the matching interval is determined as the threshold grayscale.

2. The method for determining the driving current of a gate-controlled stacked structure light-emitting device according to claim 1, wherein: The step S5 comprises: According to the first functional relationship diagram, determining a current corresponding to the required grayscale value in the first functional relationship diagram as the third current; Controlling the gate control electrode to apply a fixed first gate voltage to the first electrode and / or the second electrode; controlling the first power supply to apply a third current to the light-emitting device, and continuously adjusting the third current; In response to the light emitting brightness of the light emitting device meeting the required grayscale value, the current third current is determined as a standard driving current of the required grayscale value.

3. The method for determining the driving current of a gate-controlled stacked structure light-emitting device according to claim 1, wherein: The step S6 comprises: According to the first functional relationship diagram, determining a current corresponding to the required grayscale value in the first functional relationship diagram as the fourth current; Control the first power supply to apply a fourth current to the light-emitting device, control the gate control electrode to apply a second gate voltage to the first electrode and / or the second electrode, and continuously adjust the fourth current and the second gate voltage; in response to the luminous brightness of the light-emitting device meeting the required grayscale value and the luminous efficiency of the light-emitting device meeting the required efficiency, determine the current fourth current as the standard driving current of the required grayscale value.

4. The method for determining the driving current of a gate-controlled stacked structure light-emitting device according to claim 1, wherein: In step S6, the method further includes: In response to the luminance of the light emitting device meeting the required grayscale value and the luminous efficiency of the light emitting device meeting the required efficiency, the current second gate voltage is determined as a standard driving gate voltage of the required grayscale value.

5. The method for determining the driving current of a gate-controlled stacked structure light-emitting device according to claim 1, wherein: During use of the light emitting device, the method includes: Obtaining a display grayscale value of the light-emitting device, and obtaining the corresponding standard driving current according to the display grayscale value; obtaining a corresponding standard driving gate voltage according to the standard driving current; wherein, when the display grayscale value is less than the threshold grayscale, the standard driving gate voltage is the same gate voltage; The first power supply is controlled to apply the standard driving current to the light emitting device, and the gate control electrode is controlled to apply the standard driving gate voltage to the first electrode and / or the second electrode.

6. The method for determining the driving current of a gate-controlled stacked structure light-emitting device according to claim 1, wherein: The light-emitting device is a quantum dot light-emitting diode, and the light-emitting functional layer includes a hole transport layer, a quantum dot light-emitting layer and an electron transport layer.

7. The method for determining the driving current of a gate-controlled stacked structure light-emitting device according to claim 1, wherein: The light-emitting device is an organic light-emitting diode, and the light-emitting functional layer includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer and an electron injection layer.

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