Single-path adjustable OLED constant-current driver and OLED constant-current driving method

Abstract

The invention relates to a single-path adjustable OLED constant-current driver and an OLED constant-current driving method. The method comprises the steps that an interaction assembly receives target OLED current and target irradiation time; the current acquisition assembly acquires the current OLED current of the to-be-driven OLED; the driving assembly is used for determining a target voltage according to the target OLED current and the target irradiation time, and driving the to-be-driven OLED according to the target voltage; and when the absolute value of the difference value between the current OLED current and the target OLED current is greater than a preset threshold value, the control component adjusts the target voltage according to the difference value, so that the absolute value of the difference value between the current OLED current and the target OLED current is smaller than or equal to the preset threshold value. Therefore, the problems of small output current, low current stability, high manufacturing cost and the like in the prior art are solved, the stability of the output current and the size of the output current are improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and in particular to a single-channel adjustable OLED constant current driver and an OLED constant current driving method. Background Art

[0002] Organic light-emitting diodes (OLEDs) have great application potential in the fields of lighting and display. As a new type of display technology, it has many advantages such as self-luminescence, high contrast, wide viewing angle, and fast response speed. It has been widely used in small-sized panels and has also shown great potential in the field of large-sized displays. The OLED driver plays a vital role in the OLED display system. It is responsible for controlling the light emission of the OLED panel and directly affects the quality and performance of the OLED display. OLED is a light-emitting diode composed of organic materials, and its structure usually includes an anode, an organic light-emitting layer, and a cathode. In a passive OLED device, the light emission of each pixel is driven by the current provided by an external circuit. The driving characteristic of the passive OLED device is current drive, that is, the brightness of the pixel is proportional to the driving current. Therefore, in order to achieve a uniform display effect, it is necessary to ensure that the driving current of each pixel is uniform.

[0003] In the related art, there are generally the following ways to drive OLED with constant current: (1) Simple constant current source: Use a stable current source to provide constant current for OLED. It is usually composed of a reference voltage source, a resistor and a transistor. The reference voltage source generates a stable voltage, which is converted into current through the resistor. The transistor then controls the on and off and size of the current, thereby realizing constant current drive for OLED. (2) Current mirror solution: Based on the current mirror principle of transistors, a reference current source and multiple current mirror transistors are used to provide the same constant current for multiple OLEDs. The reference current source generates a precise current, and the current mirror transistor copies the current to each OLED driving branch, thereby realizing constant current drive for multiple pixels. (3) Pulse width modulation (PWM) constant current driver solution: Control the average current of OLED by adjusting the width of the pulse signal. In a fixed period, when the pulse signal is high, the constant current source provides current to OLED, and when the pulse signal is low, the current is zero. By changing the ratio of pulse width to period, that is, duty cycle, the average current of OLED pixels can be changed, thereby achieving different brightness displays. (4) Polysilicon thin film transistor (TFT) constant current driver solution: Utilize the characteristics of polysilicon TFT to achieve constant current drive. Polysilicon TFT has high carrier mobility and good current control capability. By properly designing the size and layout of TFT, precise constant current drive of OLED can be achieved.

[0004] However, although solution (1) has a simple circuit structure, low cost and is easy to implement, the current accuracy is relatively low, it is greatly affected by the power supply voltage and process deviation, and the output current is small. Although solution (2) has high current accuracy, it requires a large chip area to implement multiple current mirror transistors, and has high requirements for transistor matching, otherwise it will cause current errors and small output current. Although solution (3) can achieve wide-range brightness adjustment without changing the current size of the constant current source, and has high efficiency and low power consumption, it requires a fast switching circuit to control the pulse signal, and has high requirements for the speed and stability of the circuit, which will cause OLED flickering. Although solution (4) can be integrated on the same substrate with the OLED display panel, reducing the number of external drive chips, reducing costs and power consumption, the process of polysilicon TFT is relatively complex, and there are problems such as threshold voltage drift. Special compensation technology is required to ensure the stability and consistency of the current. The production cost is high and needs to be solved urgently. Summary of the invention

[0005] The present invention provides a single-channel adjustable OLED constant current driver and an OLED constant current driving method to solve the problems of small output current, low current stability, high manufacturing cost, etc. in the related art, improve the stability and size of the output current, and reduce the manufacturing cost.

[0006] A first aspect of the present invention provides a single-channel adjustable OLED constant current driver, comprising: an interactive component for receiving a target OLED current and a target irradiation time; a current acquisition component for acquiring a current OLED current of an OLED to be driven; a driving component for determining a target voltage according to the target OLED current and the target irradiation time, and driving the OLED to be driven according to the target voltage; and a control component for adjusting the target voltage according to the difference between the current OLED current and the target OLED current when the absolute value of the difference between the current OLED current and the target OLED current is greater than a preset threshold, so that the absolute value of the difference between the current OLED current and the target OLED current is less than or equal to the preset threshold.

[0007] Further, in some embodiments, the driving component includes: a digital-to-analog conversion unit, first to third resistors, a DC-DC power chip, an inductor and a capacitor, wherein one end of the digital-to-analog conversion unit is connected to the control component, and the other end of the digital-to-analog conversion unit is connected to one end of the third resistor; one end of the first resistor is connected to the ground node, the other end of the first resistor is respectively connected to one end of the second resistor, the other end of the third resistor and the feedback interface of the DC-DC power chip, and the other end of the second resistor is connected to the ground node through the capacitor; the voltage input end of the DC-DC power chip is connected to the power access node, the ground end of the DC-DC power chip is connected to the ground node, and the output end of the DC-DC power chip is connected to the inductor; the other end of the inductor is connected to the OLED to be driven through the current acquisition component;

[0008] Further, in some embodiments, the interactive component includes: an input unit for inputting the target OLED current and the target irradiation time; a display unit for displaying the target OLED current, and / or the target irradiation time, and / or the current OLED current.

[0009] Furthermore, in some embodiments, the display unit is a liquid crystal display screen.

[0010] Furthermore, in some embodiments, the single-channel adjustable OLED constant current driver further includes: a power supply component, wherein the power supply component is connected to the control component and is used to supply power to the control component.

[0011] Furthermore, in some embodiments, the single-channel adjustable OLED constant current driver further includes: a debugging interface provided on the control component, for debugging according to a debugging instruction.

[0012] According to the single-channel adjustable OLED constant current driver provided by the embodiment of the present invention, it is convenient to set the OLED light-emitting body current, change the luminous intensity and irradiation time, realize the constant current control and current program control setting of high-power OLED devices, and can realize any current setting of 5-600mA, and control the output current in 1mA steps, and achieve a larger constant current output by adjusting the circuit parameters. It solves the problems of small output current, low current stability, high production cost, etc. in the related art, improves the stability of the output current and the size of the output current, and reduces the production cost.

[0013] A second aspect of the present invention provides an OLED constant current driving method, comprising the following steps: receiving a target OLED current and a target irradiation time; determining a target voltage based on the target OLED current and the target irradiation time, and driving the OLED to be driven according to the target voltage.

[0014] Furthermore, in some embodiments, after driving the OLED to be driven according to the target voltage, it also includes: collecting the current OLED current of the OLED to be driven; when the absolute value of the difference between the current OLED current and the target OLED current is greater than a preset threshold, adjusting the target voltage according to the difference, so that the absolute value of the difference between the current OLED current and the target OLED current is less than or equal to the preset threshold.

[0015] Furthermore, in some embodiments, the OLED constant current driving method further includes: displaying the target OLED current, and / or the target irradiation time, and / or the current OLED current.

[0016] Furthermore, in some embodiments, the OLED constant current driving method further includes: determining whether a debugging request is received; if the debugging request is received, determining a debugging instruction based on the debugging request; and performing debugging according to the debugging instruction based on the debugging interface.

[0017] According to the OLED constant current driving method provided by the embodiment of the present invention, it is convenient to set the OLED light-emitting body current, change the luminous intensity and irradiation time, realize the constant current control and current program control setting of the high-power OLED device, and can realize any current setting of 5 to 600mA, and control the output current in 1mA steps, and achieve a larger constant current output by adjusting the circuit parameters. It solves the problems of small output current, low current stability, high production cost, etc. existing in the related art, improves the stability of the output current and the size of the output current, and reduces the production cost.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A block diagram of a single-channel adjustable OLED constant current driver provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of a single-channel adjustable OLED constant current driver system according to a specific embodiment of the present invention;

[0022] Figure 3 A circuit diagram of a single-channel adjustable OLED constant current driver according to a specific embodiment of the present invention;

[0023] Figure 4 A flow chart of an OLED constant current driving method according to a specific embodiment of the present invention;

[0024] Figure 5 This is a flow chart of an OLED constant current driving method according to another embodiment of the present invention;

[0025] Figure 6 The figure is a flow chart of an OLED constant current driving method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] The following describes the single-channel adjustable OLED constant current driver and OLED constant current driving method of the embodiment of the present invention with reference to the accompanying drawings. In view of the relatively low current accuracy mentioned in the above background technology, which is greatly affected by the power supply voltage and process deviation, and the problem of small output current, the present invention provides a single-channel adjustable OLED constant current driver. By setting the OLED light-emitting body current, changing the luminous intensity and irradiation time, constant current control and current process control settings of high-power OLED devices can be achieved. At the same time, any current setting of 5 to 600mA can be achieved, and the output current can be controlled in 1mA steps. A larger constant current output can be achieved by adjusting the circuit parameters. Thus, the problems of small output current, low current stability, and high production cost are solved.

[0028] Specifically, Figure 1 A block diagram of a single-channel adjustable OLED constant current driver provided by an embodiment of the present invention.

[0029] like Figure 1 As shown, the single-channel adjustable OLED constant current driver 10 includes: an interaction component 100 , a current acquisition component 200 , a driving component 300 and a control component 400 .

[0030] Among them, the interaction component 100 is used to receive the target OLED current and the target irradiation time; the current acquisition component 200 is used to collect the current OLED current of the OLED to be driven; the driving component 300 is used to determine the target voltage according to the target OLED current and the target irradiation time, and drive the OLED to be driven according to the target voltage; the control component 400 is used to adjust the target voltage according to the difference when the absolute value of the difference between the current OLED current and the target OLED current is greater than a preset threshold, so that the absolute value of the difference between the current OLED current and the target OLED current is less than or equal to the preset threshold.

[0031] In some embodiments, the interactive component 100 includes: an input unit and a display unit. The input unit is used to input the target OLED current and the target irradiation time; the display unit is used to display the target OLED current, and / or the target irradiation time, and / or the current OLED current.

[0032] Optionally, in some embodiments, the display unit is a liquid crystal display screen.

[0033] It should be noted that in order to study the stress response of cells, the effects of photosynthesis, the mechanism of light damage and other aspects, the test experiment will control variables such as light intensity, wavelength, and irradiation time, and use a series of detection methods to observe the physiological changes of cells. It is very necessary to control the light intensity and irradiation time.

[0034] Furthermore, in some embodiments, Figure 3 As shown, the driving component 300 includes: a digital-to-analog conversion unit DAC, first to third resistors, a DC-DC power chip, an inductor and a capacitor, wherein one end of the digital-to-analog conversion unit DAC is connected to the control component 400, and the other end of the digital-to-analog conversion unit DAC is connected to one end of the third resistor R3; one end of the first resistor R1 is connected to the ground node, the other end of the first resistor R1 is respectively connected to one end of the second resistor R2, the other end of the third resistor R2 and the feedback interface of the DC-DC power chip, and the other end of the second resistor R2 is connected to the ground node through the capacitor; the voltage input end of the DC-DC power chip is connected to the power access node, the ground end of the DC-DC power chip is connected to the ground node, and the output end of the DC-DC power chip is connected to the inductor; the other end of the inductor is connected to the OLED to be driven through the current collection component 200;

[0035] Specifically, combined Figures 1 to 3 ,in, Figure 2 It is a structural schematic diagram of a single-channel adjustable OLED constant current driver system according to a specific embodiment of the present invention. Figure 3The circuit diagram of a single-channel adjustable OLED constant current driver provided according to a specific embodiment of the present invention, wherein the embodiment of the present invention can dynamically adjust the DC / DC output current by adding a high-precision DAC chip to the resistance feedback network of the DC / DC switching voltage regulator circuit, and controlling the DAC output voltage through the MCU (i.e., the control component 400). The current flowing through the OLED is read through the current statistics chip, and the OLED resistance change is fed back to the MCU according to Ohm's law to dynamically adjust the output current of the OLED driver. Through the program-controlled algorithm, the DAC output is set to control the DC / DC output voltage to achieve a constant current flowing through the OLED. The MCU continuously adjusts the DAC voltage through algorithm analysis and comparison to keep the current passing through the OLED constant. Through this closed-loop control method, the OLED luminous intensity can be conveniently set, and the OLED is allowed to control the OLED luminescence according to the set current parameters. Due to the existence of the feedback mechanism, the current flowing through the OLED is guaranteed to be constant, the luminous intensity is stable and controllable, and the service life of the device is extended.

[0036] Among them, through the programmable interactive interface design, any current of 5 to 500mA can be set in 1mA steps. And the appropriate digital control algorithm is used to achieve precise control of the constant current source, and a larger constant current output can be achieved by changing the circuit parameters.

[0037] It should be noted that DAC is one of the cores of constant current driver, and its resolution and accuracy directly affect the accuracy of current control. High-precision DAC has higher resolution and can provide more precise current regulation. 14-bit DAC can provide 2 14 =16384 levels, which can more accurately control the voltage adjustable amplitude accuracy.

[0038] Furthermore, in the embodiment of the present invention, the DC / DC power supply chip outputs V OUT The DAC output voltage V DAC Control, the DC / DC power chip pin FB is the chip voltage feedback pin, the voltage V FB It is a fixed reference voltage. Different DC / DC chips have different reference voltages. According to the circuit principle, I 1 ,I 2 and I 3 The expression is:

[0039] I 1 =V FB / R1 (1)

[0040] I 2 =V OUT -V FB / R2 (2)

[0041] I3 =V DAC -V FB / R3 (3)

[0042] From this we can deduce that V OUT The expression is:

[0043] V OUT =(1+R2 / R1+R2 / R3)×V FB -(R2 / R3)×V DAC (4)

[0044] Among them, V FB The voltage of the feedback pin of the DC / DC power supply chip, V OUT is the output voltage of the DC / DC power chip, V DAC is the output voltage of the digital-to-analog converter DAC.

[0045] Specifically, from formula (4), we can see that V OUT and V DAC Inversely proportional, when V DAC When the voltage is 0, the maximum output voltage is V OUT =(1+R2 / R1+R2 / R3)×V FB , where the last term is (R2 / R3)×V DAC Indicates the adjustable range of voltage. In this way, the OLED voltage can be accurately changed. When the OLED heats up and the internal resistance changes, the output voltage of the DC / DC power chip is dynamically adjusted to achieve precise control of the OLED.

[0046] Furthermore, in some embodiments, the single-channel adjustable OLED constant current driver 10 further includes: a power supply component, which is connected to the control component 400 and is used to supply power to the control component 400 .

[0047] Among them, the power supply unit can use a constant current power supply, which is convenient for using digital signals to control the output current of the constant current source.

[0048] Furthermore, in some embodiments, the single-channel adjustable OLED constant current driver 10 further includes: a debugging interface provided in the control component, for debugging according to a debugging instruction.

[0049] Among them, debugging instructions can be issued by users according to actual needs to implement relevant debugging.

[0050] Specifically, the embodiments of the present invention can utilize some debugging devices to be connected to the control component via a debugging interface, thereby facilitating the user to perform relevant debugging actions, and the specific debugging content can be determined according to actual conditions.

[0051] In order to enable those skilled in the art to better understand the single-channel adjustable OLED constant current driver according to the embodiment of the present invention, it will be explained below in conjunction with specific embodiments.

[0052] Figure 4 This is a flow chart of an OLED constant current driving method provided according to a specific embodiment of the present invention, comprising the following steps:

[0053] In step S401 , the user sets the current and illumination time of the OLED.

[0054] The current of the OLED is set through the liquid crystal display interface of the interactive component 100, and the OLED driving circuit controls the output current through the voltage of the DAC, thereby determining the luminous intensity and luminous time of the OLED.

[0055] In step S402, a DAC chip is used to control the DC / DC output voltage.

[0056] In step S403, the DC / DC power chip drives the OLED.

[0057] In step S404, a current statistics chip is used to collect OLED current in real time.

[0058] In step S405, the DAC output is adjusted in a timely manner according to the collected current.

[0059] Furthermore, the embodiment of the present invention can also realize OLED constant current driving control by the user controlling the switch of the OLED according to the user's use needs.

[0060] Figure 5 The figure is a flow chart of an OLED constant current driving method according to another embodiment of the present invention.

[0061] The embodiment includes the following steps:

[0062] In step S501, the user interface is initialized.

[0063] In step S502, the user sets the current and illumination time of the OLED.

[0064] In step S503, it is determined whether the user turns on the OLED, if the OLED is turned on, step S504 is executed, otherwise, step S506 is executed to turn it off.

[0065] In step S504, the DAC is set to control the DC / DC output voltage.

[0066] In step S505, the current statistics chip collects the OLED current.

[0067] In step S506 , the OLED is turned off.

[0068] Therefore, a prototype is developed by the embodiment of the present invention, which can achieve high-precision control of the current flowing through the OLED. Test data show that the current error is less than ±3%. At the same time, the current is conveniently set on the programmable interactive interface, and a timer can be set to accurately control the OLED switching time.

[0069] According to the single-channel adjustable OLED constant current driver provided by the embodiment of the present invention, it is convenient to set the OLED light-emitting body current, change the luminous intensity and irradiation time, realize the constant current control and current program control setting of high-power OLED devices, and can realize any current setting of 5-600mA, and control the output current in 1mA steps, and achieve a larger constant current output by adjusting the circuit parameters. It solves the problems of small output current, low current stability, high production cost, etc. in the related art, improves the stability of the output current and the size of the output current, and reduces the production cost.

[0070] Next, the OLED constant current driving method according to the embodiment of the present invention is described with reference to the accompanying drawings.

[0071] Figure 6 The figure is a flow chart of an OLED constant current driving method according to an embodiment of the present invention.

[0072] like Figure 6 As shown, the OLED constant current driving method includes the following steps:

[0073] In step S601 , a target OLED current and a target illumination time are received.

[0074] In step S601 , a target voltage is determined based on a target OLED current and a target irradiation time, and the OLED to be driven is driven according to the target voltage.

[0075] Furthermore, in some embodiments, after driving the OLED to be driven according to the target voltage, it also includes: collecting the current OLED current of the OLED to be driven; when the absolute value of the difference between the current OLED current and the target OLED current is greater than a preset threshold, adjusting the target voltage according to the difference, so that the absolute value of the difference between the current OLED current and the target OLED current is less than or equal to the preset threshold.

[0076] Furthermore, in some embodiments, the OLED constant current driving method further includes: displaying a target OLED current, and / or a target irradiation time, and / or a current OLED current.

[0077] Furthermore, in some embodiments, the OLED constant current driving method further includes: determining whether a debugging request is received; if a debugging request is received, determining a debugging instruction based on the debugging request; and performing debugging according to the debugging instruction based on a debugging interface.

[0078] It should be noted that the above explanation of the embodiment of the single-channel adjustable OLED constant current driver is also applicable to the OLED constant current driving method of this embodiment, and will not be repeated here.

[0079] According to the OLED constant current driving method provided by the embodiment of the present invention, it is convenient to set the OLED light-emitting body current, change the luminous intensity and irradiation time, realize the constant current control and current program control setting of the high-power OLED device, and can realize any current setting of 5 to 600mA, and control the output current in 1mA steps, and achieve a larger constant current output by adjusting the circuit parameters. It solves the problems of small output current, low current stability, high production cost, etc. existing in the related art, improves the stability of the output current and the size of the output current, and reduces the production cost.

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "N" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0082] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0083] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0084] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. A single-channel adjustable OLED constant current driver, characterized in that: include: An interaction component for receiving a target OLED current and a target irradiation time; A current acquisition component, used for acquiring the current OLED current of the OLED to be driven; A driving component, configured to determine a target voltage according to the target OLED current and the target irradiation time, and drive the OLED to be driven according to the target voltage; A control component is used to adjust the target voltage according to the difference between the current OLED current and the target OLED current when the absolute value of the difference between the current OLED current and the target OLED current is greater than a preset threshold, so that the absolute value of the difference between the current OLED current and the target OLED current is less than or equal to the preset threshold.

2. The single-channel adjustable OLED constant current driver according to claim 1, characterized in that: The driving component includes: a digital-to-analog conversion unit, first to third resistors, a DC-DC power supply chip, an inductor and a capacitor, wherein: One end of the digital-to-analog conversion unit is connected to the control component, and the other end of the digital-to-analog conversion unit is connected to one end of the third resistor; One end of the first resistor is connected to the ground node, the other end of the first resistor is respectively connected to one end of the second resistor, the other end of the third resistor and the feedback interface of the DC-DC power supply chip, and the other end of the second resistor is connected to the ground node through the capacitor; The voltage input terminal of the DC-DC power chip is connected to the power access node, the ground terminal of the DC-DC power chip is connected to the ground node, and the output terminal of the DC-DC power chip is connected to the inductor; The other end of the inductor is connected to the OLED to be driven through the current collection component.

3. The single-channel adjustable OLED constant current driver according to claim 1, characterized in that: The interactive component includes: An input unit, used for inputting the target OLED current and the target irradiation time; A display unit is used to display the target OLED current, and / or the target irradiation time, and / or the current OLED current.

4. The single-channel adjustable OLED constant current driver according to claim 3, characterized in that: The display unit is a liquid crystal display screen.

5. The single-channel adjustable OLED constant current driver according to claim 1, characterized in that: Also includes: A power supply component is connected to the control component and is used to supply power to the control component.

6. The single-channel adjustable OLED constant current driver according to claim 1, characterized in that: Also includes: The debugging interface provided in the control component is used for debugging according to the debugging instruction.

7. An OLED constant current driving method, characterized in that: The single-channel adjustable OLED constant current driver according to any one of claims 1 to 6 is used, wherein the method comprises the following steps: receiving a target OLED current and a target irradiation time; A target voltage is determined based on the target OLED current and the target irradiation time, and the OLED to be driven is driven according to the target voltage.

8. The method according to claim 7, characterized in that After driving the to-be-driven OLED according to the target voltage, the method further includes: Collecting the current OLED current of the OLED to be driven; When the absolute value of the difference between the current OLED current and the target OLED current is greater than a preset threshold, the target voltage is adjusted according to the difference so that the absolute value of the difference between the current OLED current and the target OLED current is less than or equal to the preset threshold.

9. The method according to claim 8, characterized in that Also includes: The target OLED current, and / or the target irradiation time, and / or the current OLED current are displayed.

10. The method according to claim 7, characterized in that Also includes: Determine whether a debugging request is received; If the debugging request is received, determining a debugging instruction based on the debugging request; Based on the debugging interface, debugging is performed according to the debugging instruction.

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