Micro-led driving circuit, driving method and display device

Abstract

The application relates to a Micro-LED driving circuit, a driving method and a display device. The Micro-LED driving circuit comprises a timing control module, a voltage division module, a first power supply module and a second power supply module. The first end of the voltage division module is electrically connected with the feedback end of the first power supply module, the second end is grounded, the third end is electrically connected with the second output end of the second power supply module, and the fourth end is electrically connected with the driving end of the Micro-LED. The first power supply module comprises a first output end and a feedback end, the first output end is electrically connected with the driving end, and the voltage of the first output end is adjusted according to the voltage of the feedback end. The second power supply module comprises a signal receiving end and a second output end, the signal receiving end is electrically connected with the timing control module, the voltage of the second output end is adjusted according to the control instruction output by the timing control module, and the voltage of the driving end and the feedback end is correspondingly changed. The Micro-LED driving circuit provided by the application can output a large current through the first power supply module and realize voltage switching through the second power supply module.

Description

Technical Field

[0001] This application relates to the field of displays, and in particular to a Micro-LED driving circuit, driving method, and display device. Background Technology

[0002] With the development of Micro-LED display technology, higher requirements have been placed on display image quality. In some special scenes or images, higher brightness and contrast are required, so HDR (High Dynamic Range Imaging) function has also been added to Micro-LED displays.

[0003] In traditional technology, Micro-LED displays are driven by a combination of PAM (Pulse Amplitude Modulation) and PWM (Pulse Width Modulation). PAM determines the current magnitude, while PWM determines the emission time. The combination of the two controls the brightness of the displayed image.

[0004] However, given the current low luminous efficiency of Micro-LEDs, displaying HDR images requires a significant increase in luminous current, and there is currently a lack of driver power supplies that can simultaneously meet the requirements of output voltage switching and high current output capability. Summary of the Invention

[0005] Therefore, it is necessary to provide a Micro-LED driving circuit, driving method, and display device that can meet the requirements of output voltage switching and high current output capability.

[0006] In a first aspect, this application provides a Micro-LED driving circuit, the Micro-LED driving circuit comprising:

[0007] Timing control module;

[0008] The voltage divider module has a first terminal electrically connected to the feedback terminal of the first power module, a second terminal grounded, a third terminal electrically connected to the second output terminal of the second power module, and a fourth terminal electrically connected to the driving terminal of the Micro-LED.

[0009] A first power supply module includes a first output terminal and a feedback terminal. The first output terminal is electrically connected to the driving terminal and is used to adjust the voltage of the first output terminal according to the voltage of the feedback terminal.

[0010] The second power supply module includes a signal receiving end and a second output end. The signal receiving end is electrically connected to the timing control module and is used to adjust the voltage of the second output end according to the control command output by the timing control module, so that the voltages of the driving end and the feedback end change accordingly.

[0011] In one embodiment, the voltage divider module includes:

[0012] A first voltage divider unit, wherein a first terminal of the first voltage divider unit is electrically connected to the feedback terminal, and a second terminal of the first voltage divider unit is grounded;

[0013] The second voltage divider unit has its first terminal electrically connected to the first voltage divider unit.

[0014] The third voltage divider unit has a first end electrically connected to the second end of the second voltage divider unit, and the second end of the third voltage divider unit is electrically connected to the drive end.

[0015] The fourth voltage divider unit has its first end electrically connected to the second end of the second voltage divider unit, and its second end electrically connected to the second output terminal.

[0016] In one embodiment, the first voltage divider unit includes a first resistor; and / or, the second voltage divider unit includes a second resistor; and / or, the third voltage divider unit includes a third resistor; and / or, the fourth voltage divider unit includes a fourth resistor.

[0017] In one embodiment, the driver is an ELVDD port.

[0018] In one embodiment, the voltage output by the second output terminal includes a high voltage range and a low voltage range, and the timing control module is used to acquire the display signal and determine the display type of the display signal, wherein the display type includes normal display and HDR display;

[0019] When the display signal is in normal display mode, the control command makes the voltage output by the second output terminal in the high voltage range. When the display signal is in HDR display mode, the control command makes the voltage output by the second output terminal in the low voltage range.

[0020] In one embodiment, the first power module includes a comparator, a first input terminal of the comparator being a preset voltage value, a feedback terminal connected to a second input terminal of the comparator, and an output terminal of the comparator connected to a first output terminal, such that the output voltage of the first output terminal can be adjusted according to the voltage value of the feedback terminal.

[0021] In one embodiment, the signal receiving end of the second power module includes a data receiving end and a timing receiving end, wherein the data receiving end is used to receive data signals and the timing receiving end is used to receive timing signals.

[0022] Secondly, this application also provides a driving method applied to any of the Micro-LED driving circuits described in the claims, comprising the following steps:

[0023] Provide display signals;

[0024] The first power module supplies power to the driving terminal of the Micro-LED, so that the driving terminal is at a first voltage value;

[0025] The timing control module receives the display signal, performs timing processing on the display signal to obtain timing signal and data signal, and transmits the timing signal and data signal to the second power module.

[0026] The second power module receives the timing signal and the data signal, and determines the output voltage value based on the timing signal and the data signal. The output voltage value is changed to make the driving terminal be at a second voltage value.

[0027] The voltage value at the feedback terminal of the first power module changes, thereby adjusting the voltage value at the first output terminal of the first power module so that the driving terminal is at the target voltage value.

[0028] In one embodiment, the step of the second power module determining the output voltage value includes:

[0029] Provide a mapping table between the driving terminal voltage and the second output terminal voltage;

[0030] The target voltage value is determined based on the displayed signal, and the voltage value of the second output terminal is determined based on the mapping table and the target voltage value.

[0031] Thirdly, this application also provides a display device including any of the Micro-LED driving circuits described in the previous application.

[0032] The aforementioned Micro-LED driving circuit, driving method, and display device include a timing control module, a voltage divider module, a first power supply module, and a second power supply module, used for precise driving control of the Micro-LED. The timing control module is responsible for generating and outputting control signals. The first output terminal of the first power supply module is connected to the driving terminal of the Micro-LED, responsible for providing a large driving voltage and driving current to the Micro-LED, thereby powering the Micro-LED. The second power supply module can receive signals from the timing control module and change the voltage value output by the first power supply module. Therefore, the Micro-LED driving circuit provided in this application can output a large current through the first power supply module while simultaneously achieving voltage switching through the second power supply module. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a structural block diagram of a Micro-LED driving circuit in one embodiment;

[0035] Figure 2 This is a circuit diagram of a voltage divider module in one embodiment;

[0036] Figure 3 This is a flowchart of the driving method in one embodiment.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Timing control module; 20. Voltage divider module; 21. First voltage divider unit; 22. Second voltage divider unit; 23. Third voltage divider unit; 24. Fourth voltage divider unit; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor; 30. First power supply module; 40. Second power supply module; 50. Driver terminal. Detailed Implementation

[0039] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0041] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0042] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0043] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0044] like Figure 1 As shown, this application provides a Micro-LED driving circuit. The circuit includes a timing control module 10, a voltage divider module 20, a first power supply module 30, and a second power supply module 40, primarily used for precise driving control of the Micro-LED. The timing control module 10 is responsible for generating and outputting control signals, coordinating the operation of various modules within the system, enabling the Micro-LED to operate as expected. Specifically, the first output terminal of the first power supply module 30 is connected to the driving terminal 50 of the Micro-LED, responsible for providing the necessary voltage and current to the Micro-LED, thereby achieving power supply and driving of the Micro-LED. The timing control module 10 outputs control signals as needed to adjust the operating mode of the entire system to ensure that the brightness, color, and other characteristics of the LED meet the requirements.

[0045] The voltage divider module 20 is connected between the first power supply module 30 and the second power supply module 40. Its function is to adjust the output voltage of the second power supply module 40 according to the control signal output by the timing control module 10, so as to precisely control the driving voltage of the Micro-LED by adjusting the output voltage of the first power supply module 30. Through this voltage divider adjustment function, the second power supply module 40 can provide the required precise voltage to the driving end 50, thereby ensuring the normal operation of the Micro-LED and improving its display effect and efficiency.

[0046] For example, the driver terminal 50 of the Micro-LED can be an ELVDD port.

[0047] Specifically, the second power supply module 40 includes a signal receiving end and a second output end. The signal receiving end is electrically connected to the timing control module 10 and is used to adjust the voltage of the second output end according to the control command output by the timing control module 10, so that the voltages of the driving end 50 and the feedback end change accordingly.

[0048] The first power module 30 includes a first output terminal and a feedback terminal. The first output terminal is electrically connected to the drive terminal 50 and is used to adjust the voltage of the first output terminal according to the voltage of the feedback terminal. The voltage of the feedback terminal acts on the voltage of the first output terminal, causing the voltage of the first output terminal to change in accordance with the voltage of the second output terminal in the second power module 40.

[0049] The voltage value provided by the first output terminal is greater than the voltage value of the second output terminal. This is because the first power module 30 is mainly used to provide a large voltage to achieve a large current, while the second power module 40 is mainly used to adjust the voltage of the drive terminal 50 according to the input display signal.

[0050] See Figure 1 The voltage divider module 20 has its first terminal electrically connected to the feedback terminal of the first power module 30, its second terminal grounded, its third terminal electrically connected to the second output terminal of the second power module 40, and its fourth terminal electrically connected to the driving terminal 50 of the Micro-LED. The function of the voltage divider module 20 is to adjust the voltage of the driving terminal 50 based on the voltage value of the second output terminal of the second power module 40. Therefore, it is necessary to feed the voltage of the driving terminal 50 back to the feedback terminal of the first power module 30. Grounding the voltage divider module 20 facilitates calculation and improves calculation accuracy.

[0051] The aforementioned Micro-LED driving circuit includes a timing control module 10, a voltage divider module 20, a first power supply module 30, and a second power supply module 40, used for precise driving control of the Micro-LED. The timing control module 10 generates and outputs control signals. The first output terminal of the first power supply module 30 is connected to the driving terminal 50 of the Micro-LED, providing a large driving voltage and driving current to the Micro-LED, thereby powering it. The second power supply module 40 receives signals from the timing control module 10 and changes the voltage value output by the first power supply module 30. Therefore, the Micro-LED driving circuit provided in this application can simultaneously output a large current through the first power supply module 30 and achieve voltage switching through the second power supply module 40.

[0052] See Figure 2 , Figure 2A schematic diagram of a voltage divider module 20 in one embodiment is shown. In some embodiments, the voltage divider module 20 includes: a first voltage divider unit 21, a first end of which is electrically connected to a feedback terminal, and a second end of which is grounded; a second voltage divider unit 22, a first end of which is electrically connected to the first voltage divider unit 21; a third voltage divider unit 23, a first end of which is electrically connected to the second end of the second voltage divider unit 22, and a second end of which is electrically connected to a drive terminal 50; and a fourth voltage divider unit 24, a first end of which is electrically connected to the second end of the second voltage divider unit 22, and a second end of which is electrically connected to a second output terminal.

[0053] Furthermore, the first voltage divider unit 21 includes a first resistor R1; and / or, the second voltage divider unit 22 includes a second resistor R2; and / or, the third voltage divider unit 23 includes a third resistor R3; and / or, the fourth voltage divider unit 24 includes a fourth resistor R4. Thus, the first end of the first resistor R1 is grounded, the second end of the first resistor R1 is electrically connected to the feedback terminal of the first power module 30 and the first end of the second resistor R2, the second end of the second resistor R2 is connected to the first ends of the third resistor R3 and the fourth resistor R4, the second end of the third resistor R3 is electrically connected to the first output terminal of the first power module 30, and the second end of the fourth resistor R4 is electrically connected to the second output terminal of the second power module 40.

[0054] The voltage output from the second output terminal includes a high voltage range and a low voltage range. The high voltage range is used for HDR display, and the low voltage range is used for normal display. The timing control module 10 is used to acquire the display signal and determine the display type of the display signal, which includes normal display and HDR display.

[0055] HDR display mode delivers richer colors and contrast, resulting in more vivid and detailed images. Therefore, it requires higher voltage to support its increased brightness and color accuracy. Conversely, normal display mode has lower voltage requirements and is typically suitable for standard display effects.

[0056] When the display signal is normal, the voltage output by the second output terminal is set to a high voltage range by the control command. When the display signal is HDR display, the voltage output by the second output terminal is set to a low voltage range by the control command.

[0057] This is because, taking the first output terminal Vout1 of the first power module 30 as the power source, the voltage of the second output terminal Vout2 of the second power module 40 changes, the voltage between the second resistor R2 and the third resistor R3 changes, causing the voltage of the feedback terminal FB (Feedback) to change, and thus changing the voltage value of ELVDD.

[0058] Specifically, the timing control module 10 is responsible for acquiring display signals from external devices or signal sources and determining the current display type based on the signal content. Specifically, the display type includes two modes: normal display and HDR display. The timing control module 10 identifies the current display requirements in real time through signal analysis. When the display signal is determined to be normal display, the timing control module 10 issues a control command, instructing the second output terminal to operate in a low voltage range to meet the voltage requirements of the standard display mode. When the display signal is determined to be HDR display, the timing control module 10 issues a different control command, switching the second output terminal to a high voltage range to support the higher brightness and wider color gamut required by the HDR display mode.

[0059] In this way, not only is the display effect optimized, but the voltage output can also be dynamically adjusted according to different display modes, thereby optimizing the system's performance and energy efficiency. When the display signal type changes, the timing control module 10 can respond quickly and adjust the voltage range according to actual needs to ensure that the display content can achieve the expected effect in different modes.

[0060] In some embodiments, the first power module 30 includes a comparator, a first input terminal of the comparator being a preset voltage value, a feedback terminal connected to a second input terminal of the comparator, and an output terminal of the comparator connected to a first output terminal, so that the output voltage of the first output terminal can be adjusted according to the voltage value of the feedback terminal.

[0061] The comparator compares the voltages at its non-inverting input (Vin(+)) and inverting input (Vin(-)). In a specific example, the voltage at the inverting input (Vin(-)) is a preset voltage value, serving as a reference voltage. When the voltage at the non-inverting input (Vin(+)) is greater than the voltage at the inverting input (Vin(-)), the output is high. When the voltage at the inverting input (Vin(-)) is greater than the voltage at the non-inverting input (Vin(+)), the output is low. This allows the voltage at the feedback terminal to be compared with the preset voltage value, thereby adjusting the voltage at the first output terminal.

[0062] See also Figure 2 In some embodiments, the signal receiving end of the second power module 40 includes a data receiving end I2C_SDA and a timing receiving end I2C_SCL. The data receiving end I2C_SDA is used to receive data signals, and the timing receiving end I2C_SCL is used to receive timing signals. The two signal ends work together to realize effective communication between the second power module 40 and the timing control module 10.

[0063] The data receiver I2C_SDA (Serial Data Line) is the data transmission channel in the I2C bus protocol, responsible for receiving and transmitting data signals. The timing receiver I2C_SCL (Serial Clock Line) is the clock signal line in the I2C bus protocol, providing timing synchronization signals to ensure correct data transmission on the I2C bus. After receiving the clock signal, the I2C_SCL port synchronizes the data reception and transmission process according to the clock frequency, thus ensuring that information transmission between modules in the system is not chaotic.

[0064] The synergistic effect of the two signal terminals enables the second power module 40 to perform precise voltage regulation after receiving appropriate data and timing signals, thereby supporting the voltage requirements under different display modes (such as normal display and HDR display).

[0065] See Figure 3 Secondly, this application also provides a driving method for any Micro-LED driving circuit, including the following steps S31-S35.

[0066] S31 provides the display signal.

[0067] S32, the first power module 30 supplies power to the driver terminal 50 of the Micro-LED, so that the driver terminal 50 is at the first voltage value.

[0068] For example, the first voltage value is the voltage value before adjustment, which can be the voltage value corresponding to HDR display or the voltage value corresponding to normal display.

[0069] S33 receives the display signal through the timing control module 10, performs timing processing on the display signal to obtain timing signal and data signal, and transmits the timing signal and data signal to the second power module 40.

[0070] S34, the second power supply module 40 receives timing signals and data signals, and determines the output voltage value according to the timing signals and data signals. The output voltage value is changed so that the drive terminal 50 is at the second voltage value.

[0071] S35, the voltage value at the feedback terminal of the first power module 30 changes, thereby adjusting the voltage value at the first output terminal of the first power module 30 so that the drive terminal 50 is at the target voltage value.

[0072] In the driving method of the Micro-LED driving circuit described above, the first power supply module 30 provides a large driving voltage and driving current to power the Micro-LED. After receiving the display signal, the timing control module 10 processes the display signal and inputs it to the second power supply module 40. The second power supply module 40 changes the voltage value of the second output terminal, thereby changing the voltage value of the Micro-LED driving terminal 50, which in turn changes the voltage value of the feedback terminal of the first power supply module 30, and finally changes the output voltage value of the first power supply module 30 to be equal to the target voltage value, so that the voltage value of the driving terminal 50 is also equal to the target voltage value.

[0073] In some embodiments, the step of the second power module 40 determining the output voltage value includes: providing a mapping table of the voltage at the drive terminal 50 and the voltage at the second output terminal; determining a target voltage value based on a display signal; and determining the voltage value at the second output terminal based on the target voltage value using the mapping table.

[0074] For example, since the circuit structure of the voltage divider module 20 is fixed, the voltage value of the second output terminal corresponds one-to-one with the voltage value of the Micro-LED driver terminal 50. Based on this, a mapping table can be constructed. After the timing control module 10 determines the target voltage value, the second power supply module 40 can determine the voltage value of the second output terminal based on the target voltage value.

[0075] This application also provides a display device, including the Micro-LED driving circuit of any of the above embodiments, and a Micro-LED chip, wherein the Micro-LED driving circuit is used to drive the Micro-LED chip.

[0076] In the description of this specification, the references to terms such as "some embodiments," "other embodiments," "ideal embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0077] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A Micro-LED driving circuit, characterized in that, The Micro-LED driving circuit includes: Timing control module; The voltage divider module has a first terminal electrically connected to the feedback terminal of the first power module, a second terminal grounded, a third terminal electrically connected to the second output terminal of the second power module, and a fourth terminal electrically connected to the driving terminal of the Micro-LED. A first power supply module includes a first output terminal and a feedback terminal. The first output terminal is electrically connected to the driving terminal and is used to adjust the voltage of the first output terminal according to the voltage of the feedback terminal. The second power supply module includes a signal receiving end and a second output end. The signal receiving end is electrically connected to the timing control module and is used to adjust the voltage of the second output end according to the control command output by the timing control module, so that the voltages of the driving end and the feedback end change accordingly.

2. The Micro-LED driving circuit according to claim 1, characterized in that, The voltage divider module includes: A first voltage divider unit, wherein a first terminal of the first voltage divider unit is electrically connected to the feedback terminal, and a second terminal of the first voltage divider unit is grounded; The second voltage divider unit has its first terminal electrically connected to the first voltage divider unit. The third voltage divider unit has a first end electrically connected to the second end of the second voltage divider unit, and the second end of the third voltage divider unit is electrically connected to the drive end. The fourth voltage divider unit has its first end electrically connected to the second end of the second voltage divider unit, and its second end electrically connected to the second output terminal.

3. The Micro-LED driving circuit according to claim 2, characterized in that, The first voltage divider unit includes a first resistor; and / or, the second voltage divider unit includes a second resistor; and / or, the third voltage divider unit includes a third resistor; and / or, the fourth voltage divider unit includes a fourth resistor.

4. The Micro-LED driving circuit according to claim 1, characterized in that, The driver is an ELVDD port.

5. The Micro-LED driving circuit according to claim 1, characterized in that, The voltage output by the second output terminal includes a high voltage range and a low voltage range. The timing control module is used to acquire the display signal and determine the display type of the display signal. The display type includes normal display and HDR display. When the display signal is in normal display mode, the control command makes the voltage output by the second output terminal in the high voltage range. When the display signal is in HDR display mode, the control command makes the voltage output by the second output terminal in the low voltage range.

6. The Micro-LED driving circuit according to claim 1, characterized in that, The first power module includes a comparator, the first input terminal of the comparator is a preset voltage value, the feedback terminal is connected to the second input terminal of the comparator, and the output terminal of the comparator is connected to the first output terminal, so that the output voltage of the first output terminal can be adjusted according to the voltage value of the feedback terminal.

7. The Micro-LED driving circuit according to claim 1, characterized in that, The signal receiving end of the second power module includes a data receiving end and a timing receiving end. The data receiving end is used to receive data signals, and the timing receiving end is used to receive timing signals.

8. A driving method applied to the Micro-LED driving circuit according to any one of claims 1-7, characterized in that, Includes the following steps: Provide display signals; The first power module supplies power to the driving terminal of the Micro-LED, so that the driving terminal is at a first voltage value; The timing control module receives the display signal, performs timing processing on the display signal to obtain timing signal and data signal, and transmits the timing signal and data signal to the second power module. The second power module receives the timing signal and the data signal, and determines the output voltage value based on the timing signal and the data signal. The output voltage value is changed to make the driving terminal be at a second voltage value. The voltage value at the feedback terminal of the first power module changes, thereby adjusting the voltage value at the first output terminal of the first power module so that the driving terminal is at the target voltage value.

9. The driving method according to claim 8, characterized in that, The steps for the second power module to determine the output voltage value include: Provide a mapping table between the driving terminal voltage and the second output terminal voltage; The target voltage value is determined based on the displayed signal, and the voltage value of the second output terminal is determined based on the mapping table and the target voltage value.

10. A display device, characterized in that, Includes the Micro-LED driving circuit according to any one of claims 1-7.

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