Micro LED driving circuit

Abstract

The application provides a micro-LED driving circuit, comprising a signal generation module, a driving module and a micro-LED; the signal generation module comprises a first capacitor, and the signal generation module outputs a driving signal based on a light-emitting control signal and a first comparison reference signal; one end of the first capacitor is connected with an output end of the signal generation module, and the other end of the first capacitor receives a second comparison reference signal; the first comparison reference signal is a linearly rising ramp signal; the second comparison signal is an inverse signal of the first comparison reference signal; the driving module is connected with the signal generation module, one end of the driving module is connected to a power supply signal, and the other end of the driving module is connected to the micro-LED; the driving signal is used for controlling the on or off time length of the driving module, so as to control the output time length of the on current; the micro-LED is connected with the driving module, is used for receiving the on current and the light-emitting control signal, and emits light in response to the control of the light-emitting control signal and the on current; and the application reduces the power consumption of the micro-LED driving circuit.

Description

Technical Field

[0001] This application relates to the field of semiconductor technology, and in particular to a micro LED driving circuit. Background Technology

[0002] With the continuous development of LED technology, micro LEDs have been widely used in the display field due to their many advantages, such as seamless splicing, high refresh rate, ultra-high definition, low energy consumption, and long lifespan. For example, mini LEDs (submillimeter-sized light-emitting diodes) and micro LEDs (micro light-emitting diodes) are widely used in ultra-small pitch LED displays.

[0003] In practical applications, miniature LEDs operate under the drive of a driving circuit. For example, the driving circuit generates driving signals of different levels based on received control commands to drive the miniature LED to emit light or not. In the example technology, when the driving circuit outputs a high-level driving signal, the internal transistors of the driving circuit are turned on, resulting in internal current. In reality, the driving circuit contains currents other than the on-state current, which leads to increased power consumption of the driving current.

[0004] In the above scheme, the driving circuit has internal current when it is working, which results in a large power consumption of the micro LED driving circuit. Summary of the Invention

[0005] This application provides a micro LED driver circuit, which aims to solve the problem of high power consumption in micro LED driver circuits.

[0006] In a first aspect, this application provides a miniature LED driving circuit, comprising: a signal generation module, a driving module, and a miniature LED; the signal generation module includes a first capacitor, receives a light emission control signal and a first comparison reference signal, and outputs a driving signal based on the light emission control signal and the first comparison reference signal; one end of the first capacitor is connected to the output terminal of the signal generation module, and the other end of the first capacitor receives a second comparison reference signal; wherein, the first comparison reference signal is a linearly increasing ramp signal; the second comparison signal is the inverted signal of the first comparison reference signal; the driving module is connected to the signal generation module, one end of the driving module is connected to a power supply signal, and the other end of the driving module is connected to the miniature LED; wherein, the driving signal is used to control the on or off duration of the driving module to control the output duration of the on current; the miniature LED is connected to the driving module and is used to receive the on current and the light emission control signal, and emit light in response to the control of the light emission control signal and the on current.

[0007] Optionally, the signal generation module further includes: a first transistor and a comparison generation unit; the gate of the first transistor receives the first comparison reference signal, the source of the first transistor is connected to the input terminal of the comparison generation unit, and the drain of the first transistor is connected to the output terminal of the signal generation module and the first capacitor; the comparison generation unit receives a row scan signal, and is used to receive a PWMD signal through the input terminal of the comparison generation unit based on the row scan signal, so that the source voltage of the first transistor is the voltage corresponding to the PWMD signal, and connect the gate of the first transistor to the drain of the first transistor; and the comparison generation unit receives the light emission control signal, and is used to connect a first power supply voltage through the input terminal of the comparison generation unit based on the light emission control signal, so that the source voltage of the first transistor is the first power supply voltage, and compare the sum of the gate voltage of the first transistor and the source voltage of the first transistor and the threshold voltage of the first transistor, and output the driving signal through the output terminal of the comparison generation module based on the comparison result.

[0008] Optionally, the comparison generation unit includes: a second transistor, a third transistor, and a fourth transistor; the source of the second transistor is connected to the first power supply voltage, the gate of the second transistor receives the light emission control signal, and the drain of the second transistor is connected to the source of the third transistor and the source of the first transistor, for turning on or off in response to the light emission control signal; the gate of the third transistor receives the row scan signal, and the drain of the third transistor receives the PWMD signal, for turning on or off in response to the row scan signal; the gate of the fourth transistor receives the row scan signal, the source of the fourth transistor is connected to the gate of the first transistor, and the drain of the fourth transistor is connected to the drain of the first transistor, for turning on or off in response to the light emission control signal.

[0009] Optionally, the comparison generation unit further includes: a second capacitor; one end of the second capacitor receives the first comparison reference signal, and the other end of the second capacitor is connected to the gate of the first transistor.

[0010] Optionally, the signal generation module further includes an initialization unit; the initialization unit is connected to the first transistor and is used to receive a reset signal and initialize the micro LED circuit based on the reset signal.

[0011] Optionally, the initialization unit includes: a fifth transistor; the source of the fifth transistor is connected to a reference power supply voltage, the gate of the fifth transistor receives the reset signal, and the drain of the fifth transistor is connected to the gate of the first transistor, for turning on or off in response to the reset signal.

[0012] Optionally, the driving module includes: a driving transistor; the control terminal of the driving transistor is connected to the output terminal of the signal generation module, the source of the driving transistor is connected to the power supply signal, and the drain of the driving transistor is connected to the micro LED.

[0013] Optionally, the driving module further includes: a sixth transistor, a seventh transistor, and an eighth transistor; the source of the sixth transistor is connected to the first power supply voltage, the gate of the sixth transistor receives the light emission control signal, and the drain of the sixth transistor is connected to the source of the seventh transistor, for turning on or off in response to the light emission control signal; the gate of the seventh transistor is connected to the output terminal of the signal generation module, and the drain of the seventh transistor is connected to the source of the eighth transistor and the control terminal of the driving transistor, for turning on or off in response to the driving signal; the gate of the eighth transistor receives the row scan signal, and the source of the eighth transistor receives the PAMD signal, for turning on or off in response to the row scan signal.

[0014] Optionally, the driving module further includes: a ninth transistor; the gate of the ninth transistor receives the light emission control signal, the source of the ninth transistor is connected to the power supply signal, and the drain of the ninth transistor is connected to the source of the driving transistor, for responding to the light emission control signal and controlling the connection and disconnection of the driving transistor and the power supply signal.

[0015] Optionally, the driving module further includes a third capacitor; one end of the third capacitor is connected to the power supply signal, and the other end of the third capacitor is connected to the control terminal of the driving transistor.

[0016] Optionally, the transistor is turned on in response to a signal in a first level state and turned off in response to a signal in a second level state.

[0017] Optionally, the operation of the micro LED unit circuit is divided into three stages: an initialization stage, a row scanning stage, and a comparison and light emission stage. During the initialization stage, the reset signal is at the first level, and the row scanning signal and the light emission control signal are at the second level. During the row scanning stage, the row scanning signal first changes from the second level to the first level, and then changes back from the first level to the second level; the reset signal and the light emission control signal are at the second level. During the comparison and light emission stage, the light emission control signal is at the first level, and the reset signal and the row scanning signal are at the second level.

[0018] In the micro LED driving circuit provided in this application, the signal generation module includes a first capacitor. The signal generation module receives a light emission control signal and a first comparison reference signal, and outputs a driving signal based on the light emission control signal and the first comparison reference signal. One end of the first capacitor is connected to the output terminal of the signal generation module, and the other end of the first capacitor receives a second comparison reference signal. The first comparison reference signal is a linearly increasing ramp signal, and the second comparison signal is the inverted signal of the first comparison reference signal. The driving module is connected to the signal generation module. One end of the driving module is connected to a power supply signal, and the other end of the driving module is connected to the micro LED. The driving signal is used to control the on or off duration of the driving module to control the output duration of the on current. The micro LED is connected to the driving module and is used to receive the on current and the light emission control signal, and emit light in response to the light emission control signal and the control of the on current. In this application, the second comparison reference signal and the first comparison reference signal are applied synchronously and are out of phase. During the comparison and illumination stage, when the first comparison reference signal is small, the signal generation module outputs a second-level driving signal, and the micro LED emits light. At this time, the internal transistor of the signal generation module conducts, transmitting the power supply voltage to the output terminal of the signal generation module. The output terminal of the signal generation module receives the second comparison reference signal through the first capacitor, ensuring that there is no direct conductive path within the signal generation module, resulting in a small internal current. Conversely, when the first comparison reference signal is large, the second comparison reference signal is small, and the signal generation module generates a first-level driving signal, preventing the micro LED from emitting light. In this case, the internal transistor of the signal generation module is not conducting, and there is no current. The output terminal of the signal generation module receives the second comparison reference signal through the first capacitor, which can adjust the voltage at the output terminal of the signal generation module to output the first-level driving signal. In practice, the current within the signal generation module is small when the micro LED is emitting light, and there is no current within the signal generation module when the micro LED is not emitting light, thus reducing the power consumption of the micro LED driving circuit. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] Figure 1 A schematic diagram of the structure of the micro LED driving circuit provided in this application;

[0021] Figure 2 This is a schematic diagram of the micro LED driving circuit provided in Embodiment 1 of this application;

[0022] Figure 3 This is a schematic diagram of another micro LED driving circuit provided in Embodiment 1 of this application;

[0023] Figure 4 This is a schematic diagram of another micro LED driving circuit provided in Embodiment 1 of this application;

[0024] Figure 5 This is a schematic diagram of another micro LED driving circuit provided in Embodiment 1 of this application;

[0025] Figure 6 This is a schematic diagram of a micro LED driving circuit provided in Embodiment 2 of this application;

[0026] Figure 7 This is a schematic diagram of another micro LED driving circuit provided in Embodiment 2 of this application;

[0027] Figure 8 This is a schematic diagram of another micro LED driving circuit provided in Embodiment 2 of this application;

[0028] Figure 9 This is a schematic diagram of a micro LED driving circuit provided in Embodiment 3 of this application;

[0029] Figure 10 This is a signal state diagram provided for Embodiment 3 of this application.

[0030] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0033] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities and do not necessarily imply a specific order or sequence, unless otherwise indicated. It should be understood that such terms can be used interchangeably where appropriate, for example, to implement the application in a sequence other than those given in the embodiments illustrated or described herein.

[0034] Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover but not exclude inclusion. For example, a product or device that includes a series of components is not necessarily limited to those explicitly listed, but may include other components not explicitly listed or inherent to such product or device. As used in this application, the term "module" means any known or subsequently developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code capable of performing the functions associated with that element.

[0035] Figure 1 A schematic diagram of the structure of the micro LED driving circuit provided in this application. (See attached diagram.) Figure 1 As shown, the micro LED driving circuit includes a signal generation module 01, a driving module 02, and a micro LED 03.

[0036] The signal generation module 01 receives the light emission control signal EM and the comparison reference signal SWEEP, and outputs a PWM signal based on the light emission control signal EM and the comparison reference signal SWEEP. The drive module 02 is connected to the signal generation module 01. One end of the drive module 02 is connected to the power supply signal VDD, and the other end of the drive module 02 is connected to the micro LED 03. The drive module 02 responds to drive signals of different level states to control the connection or disconnection of the micro LED 03 and the power supply signal VDD, so as to control whether to output conduction current to the micro LED 03, thereby controlling the conduction time of the micro LED 03.

[0037] For example, driver module 02 turns on in response to a high-level drive signal and turns off in response to a low-level drive signal. In practical applications, when the drive signal is low, driver module 02 controls the power supply signal VDD to disconnect from the micro LED 03, driver module 02 does not output current to the micro LED, and the micro LED does not emit light; when the drive signal is high, driver module 02 controls the power supply signal VDD to connect to the micro LED 03, driver module 02 outputs current to the micro LED, and the micro LED emits light.

[0038] In a practical scenario, one end of the signal generation module is connected to the power supply voltage VGH, and the other end is connected to the power supply voltage VGL. When the output of the signal generation module 01 is a low-level drive signal, the micro LED does not emit light, the transistor inside the signal generation module 01 does not need to conduct and is connected to the power supply voltage VGH, and there is no current inside the signal generation module 01. When the output of the signal generation module 01 is a high-level drive signal, the micro LED emits light, the transistor inside the signal generation module 01 conducts and is connected to the power supply voltage VGH, resulting in current inside the signal generation module 01. In practical applications, the presence of current other than the micro LED conduction current in the drive circuit will increase the power consumption of the drive circuit. In related technologies, the power consumption of the drive circuit is relatively high.

[0039] The technical solutions of this application will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. In the description of this application, unless otherwise expressly specified and limited, the terms should be broadly understood within the art. The embodiments of this application will now be described with reference to the accompanying drawings.

[0040] Example 1

[0041] Figure 2 This is a schematic diagram of the micro LED driving circuit provided in Embodiment 1 of this application, as shown below. Figure 2 As shown, this embodiment provides a miniature LED driving circuit, including: a signal generation module 10, a driving module 11, and a miniature LED 12; wherein, the signal generation module 10 includes a first capacitor C1.

[0042] The signal generation module 10 receives the light emission control signal EM and the first comparison reference signal SWEEEP1, and outputs a drive signal based on the light emission control signal EM and the first comparison reference signal SWEEEP1. One end of the first capacitor C1 is connected to the second comparison reference signal SWEEEP2, and the other end of the first capacitor C1 is connected to the output terminal of the signal generation module 10. The first comparison reference signal SWEEEP1 is a linearly increasing ramp signal; the second comparison signal SWEEEP2 is the inverted signal of the first comparison reference signal SWEEEP1.

[0043] The driving module 11 is connected to the signal generation module 10. One end of the driving module 11 is connected to the power supply signal VDD, and the other end of the driving module 11 is connected to the miniature LED 12. The driving signal is used to control the on or off duration of the driving module 11, so as to control the output duration of the on current.

[0044] Among them, the micro LED 12 is connected to the driving module 11 and is used to receive the conduction current and the light emission control signal EM, and emit light in response to the light emission control signal EM and the control of the conduction current.

[0045] In this embodiment, the driving process of the micro LED is divided into three stages: initialization stage, horizontal scanning stage, and comparative light emission stage. During the initialization stage, the input terminal of the signal generation module 10 is set to the reference power supply voltage REF. During the horizontal scanning stage, the signal generation module 10 receives the PWMD signal and sets its input and output terminals to approximately the PWMD voltage.

[0046] The light emission control signal EM is used to control the operating stage of the aforementioned micro-LED driver circuit, specifically whether it is in the comparison light emission stage. For example, when the light emission control signal EM is in a first-level state, the current operating stage of the aforementioned micro-LED driver circuit is the comparison light emission stage; when the light emission control signal EM is in a second-level state, the current operating stage of the aforementioned micro-LED driver circuit is not the comparison light emission stage. It can be understood that the signal generation module 10 receives the light emission control signal EM. When the light emission control signal EM is in a first-level state, the current operating stage of the aforementioned micro-LED driver circuit is the comparison light emission stage, and the signal generation module begins to output a drive signal to the driver module 11.

[0047] At the start of the comparison light emission stage, the input terminal of the signal generation module 10 receives the first comparison reference signal SWEEP1, which is a linearly increasing ramp signal; the output terminal of the signal generation module 10 is connected to the driving module 11, and the signal generation module 10 outputs a second-level driving signal to the driving module 11; the driving module 11 is turned on in response to the second-level driving signal, and the micro LED 12 starts to emit light.

[0048] After a period of time following the start of the comparison and illumination phase, since the level of the first comparison reference signal SWEEP1 is still relatively low, the signal generation module 10 continues to output a drive signal at the second level. Therefore, the drive module 11 remains on, and the micro LED 12 continues to emit light. As the first comparison reference signal SWEEP1 gradually increases until its level becomes high, the signal generation module 10 outputs a drive signal at the first level, the drive module 11 turns off, and the micro LED 12 stops emitting light.

[0049] In practical applications, during the comparison illumination stage, the signal generation module 10 outputs a drive signal based on the first comparison reference signal SWEEP1. For example, when the first comparison reference signal SWEEP1 is greater than a preset threshold, the signal generation module 10 outputs a drive signal at a first level; when the first comparison reference signal SWEEP2 is less than the preset threshold, the signal generation module 10 outputs a drive signal at a second level.

[0050] In this scheme, the second comparison reference signal SWEEP2 and the first comparison reference signal SWEEP1 are applied synchronously, and the second comparison reference signal SWEEP2 is out of phase with the first comparison reference signal SWEEP1. The first comparison reference signal SWEEP1 is a linearly increasing ramp signal, and the second comparison reference signal SWEEP2 is a linearly decreasing ramp signal. Accordingly, when the first comparison reference signal SWEEP1 is less than a preset threshold, the synchronous second comparison reference signal SWEEP2 remains relatively large, having a small impact on the voltage at the output terminal of the signal generation module 10, and will not cause a change in the voltage at the output terminal of the signal generation module 10. The signal generation module 10 outputs a drive signal at the second level, and the micro LED 12 continues to emit light. Until the first comparison reference signal SWEEP1 rises to the preset threshold, causing a change in the level of the drive signal, the second comparison reference signal SWEEP2 drops to a certain voltage, causing the voltage at the output terminal of the signal generation module 10 to decrease. The signal generation module 10 then outputs a drive signal at the first level, and the micro LED 12 stops emitting light.

[0051] During the comparison and illumination phase, when the micro LED emits light, the first comparison reference signal SWEEP1 maintains a low level. Therefore, the signal generation module 10 outputs a second-level driving signal. In practical applications, when the signal generation module 10 outputs a high-level driving signal, the driving module 11 is turned on, causing the micro LED 12 to emit light. Therefore, the internal transistor of the signal generation module 10 needs to be turned on to transmit the power supply voltage VGH to the output terminal of the signal generation module 10. At this time, the second comparison reference signal SWEEP2 is relatively large. Due to the effect of the first capacitor C1, the second comparison reference signal SWEEP2 will not affect the voltage at the output terminal of the signal generation module 10, and the output terminal of the signal generation module 10 remains stable. Since the first capacitor C1 is connected to the output terminal of the signal generation module 10, there is no direct path inside the signal generation module 10, reducing the conduction current.

[0052] Conversely, when the micro LED stops emitting light, the first comparison reference signal SWEEP1 maintains a high level, and the signal generation module 10 outputs a drive signal at the first level. In practical applications, when the signal generation module 10 outputs a low-level drive signal, the drive module 11 is turned off, causing the micro LED 12 to stop emitting light. Therefore, the internal transistor of the signal generation module 10 does not need to be turned on, transmitting the power supply voltage VGH to the output terminal of the signal generation module 10. At this time, as the second comparison reference signal SWEEP2 decreases, due to the coupling effect of the first capacitor C2, the voltage at the output terminal of the signal generation module 10 decreases, and the signal generation module 10 outputs a low-level drive signal. In practical applications, when the micro LED emits light, the output terminal of the signal generation module 10 is connected to the second comparison reference signal SWEEP2 through the first capacitor C1. Through the effect of the first capacitor C1, the internal transistor of the signal generation module 10 is not directly turned on, reducing the conduction current and reducing the power consumption of the micro LED drive circuit.

[0053] It is understood that one end of the driving module 11 is connected to the power supply signal VDD, and the other end is connected to the micro LED 12. When the driving module 11 is turned on, it provides a conduction current to the micro LED 12; when the driving module 11 is turned off, it stops providing a conduction current to the micro LED 12. In this embodiment, the micro LED 12 is connected to the driving module 11 to receive the aforementioned conduction current and the aforementioned light emission control signal EM, and to emit light in response to the control of the light emission control signal EM and the aforementioned conduction current. It is understood that the micro LED 12 will only emit light when the light emission control signal EM indicates that the current operating stage of the micro LED driving circuit is the comparison light emission stage, and when the driving module 11 outputs a conduction current to the micro LED 12.

[0054] Optionally, for the signal generation module 10, in one possible implementation, Figure 3This is a schematic diagram of another micro LED driving circuit provided in Embodiment 1 of this application, as shown below. Figure 3 As shown, the signal generation module 10 further includes: a first transistor T1 and a comparison generation unit 101;

[0055] The gate of the first transistor T1 receives the first comparison reference signal SWEEP1, the source of the first transistor T1 is connected to the input terminal of the comparison generation unit 101, and the drain of the first transistor T1 is connected to the output terminal of the signal generation module 10 and the first capacitor C1.

[0056] The comparison generation unit 101 receives a row scan signal SN and, based on the row scan signal SN, receives a PWMD signal through its input terminal to make the source voltage of the first transistor T1 equal to the voltage corresponding to the PWMD signal, and connects the gate and drain of the first transistor T1; and,

[0057] The comparison generation unit 101 receives the light emission control signal EM and connects the first power supply voltage VGH to the input terminal of the comparison generation unit 101 based on the light emission control signal EM, so that the source voltage of the first transistor T1 is the first power supply voltage VGH. It also compares the gate voltage of the first transistor T1 with the sum of the source voltage and the threshold voltage of the first transistor T1, and outputs the driving signal through the output terminal of the comparison generation module 10 based on the comparison result.

[0058] In practical applications, the horizontal scanning signal SN is used to characterize whether the current operating stage of the micro LED driver circuit is the horizontal scanning stage. For example, when the horizontal scanning signal SN is in a first-level state, it indicates that the current operating stage of the micro LED driver circuit is the horizontal scanning stage; when the horizontal scanning signal SN is in a second-level state, it indicates that the current operating stage of the micro LED driver circuit is not the horizontal scanning stage. Optionally, when the horizontal scanning signal SN is in a second-level state, it indicates that the current operating stage of the micro LED driver circuit is the horizontal scanning stage; when the horizontal scanning signal SN is in a first-level state, it indicates that the current operating stage of the micro LED driver circuit is not the horizontal scanning stage.

[0059] Here, PWMD is a voltage value that changes according to the luminous intensity of the micro LED 12. When the scan signal indicates that the current operating stage of the micro LED driving circuit is the row scan stage, the input terminal of the comparison generation unit 101 receives the PWMD signal, the source voltage of the first transistor T1 is PWMD, and the gate of the first transistor T1 is connected to the drain of the first transistor T1. The voltages of the gate and drain of the first transistor T1 are equal, both being PWMD+V. th1 , where Vth1 This refers to the threshold voltage of the first transistor T1. It can be understood that, based on the row scan signal SN, the comparison generation unit 101 compensates for the threshold voltage of the first transistor T1, thus preventing the threshold voltage of the first transistor T1 from affecting the comparison result in the subsequent comparison and light emission stage.

[0060] In practical applications, during the comparison light emission stage, the comparison generation unit 101 receives the light emission control signal EM. When the light emission control signal EM indicates that the current working stage of the micro LED driving circuit is the comparison light emission stage, the input terminal of the comparison generation unit 101 is connected to the first power supply voltage VGH, and the source voltage of the first transistor T1 is the aforementioned first power supply voltage VGH.

[0061] Based on the above example, after the row scan phase, the gate voltage of the first transistor T1 and the drain voltage of the first transistor T1 are equal, both being PWMD+V. th1 In this embodiment, during the comparison light emission stage, the gate of the first transistor T1 receives the aforementioned first comparison reference signal SWEEP1, which is a linearly increasing ramp signal. Specifically, as the first comparison reference signal SWEEP1 continuously increases, the gate voltage of the first transistor T1 increases, and the gate voltage of the first transistor T1 can be expressed as PWMD+V. th1 +ΔSWEEP1, where ΔSWEEP1 is the change in the first comparison reference signal SWEEP1. When PWMD+V th1 +ΔSWEEP1 is less than VGH+V th1 When the first transistor T1 is turned on, the output terminal of the signal generation module 10 outputs a drive signal in the second level state; when PWMD+V th1 +ΔSWEEP1 is greater than VGH+V th1 When the first transistor T1 is turned off, the output terminal of the signal generation module 10 outputs a drive signal in the first level state.

[0062] In practical applications, during the row scanning phase, the comparison generation unit 101 compensates for the threshold voltage of the first transistor T1 based on the row scanning signal SN; during the comparison light emission phase, based on the light emission control signal EM, the gate voltage of the first transistor T1 is compared with the sum of the source voltage and the threshold voltage of the first transistor T1, and the driving signal is output through the output terminal of the signal generation module 10 based on the comparison result.

[0063] In this embodiment, the comparison generation unit 101 compensates for the threshold voltage of the first transistor T1 based on the row scan signal SN, and compares the gate voltage of the first transistor T1 with the sum of the source voltage and the threshold voltage of the first transistor T1 based on the light emission control signal EM. Based on the comparison result, the driving signal is output through the output terminal of the signal generation module 10. The driving module 11 can control the output duration of the conduction current based on the driving signal to turn on or off.

[0064] Optionally, regarding the comparison generation unit 101, in one possible implementation, Figure 4 This is a schematic diagram of another micro LED driving circuit provided in Embodiment 1 of this application, as shown below. Figure 4 As shown, the comparison generation unit 101 includes: a second transistor T2, a third transistor T3, and a fourth transistor T4;

[0065] The source of the second transistor T2 is connected to the first power supply voltage VGH, the gate of the second transistor T2 receives the light emission control signal EM, and the drain of the second transistor T2 is connected to the source of the third transistor T3 and the source of the first transistor T1, for turning on or off in response to the light emission control signal EM.

[0066] The gate of the third transistor T3 receives the row scan signal SN, and the drain of the third transistor T3 receives the PWMD signal, which is used to turn on or off in response to the row scan signal SN.

[0067] The gate of the fourth transistor T4 receives the row scan signal SN, the source of the fourth transistor T4 is connected to the gate of the first transistor T1, and the drain of the fourth transistor T4 is connected to the first transistor T1, for use in response to the light emission control signal EM being turned on or off.

[0068] In practical applications, when the light emission control signal EM represents the current working stage of the micro LED driving circuit as the comparison light emission stage, the second transistor T2 is turned on. The input terminal of the comparison generation unit 101 is connected to the first power supply voltage VGH through the turned-on second transistor T2, and the source of the first transistor T1 is set to the first power supply voltage VGH.

[0069] In practical applications, when the above-mentioned row scanning signal SN represents the current working stage of the micro LED driving circuit as the scanning stage, the third transistor T3 is turned on. The input terminal of the comparison generation unit 101 receives the PWMD signal through the turned-on third transistor T3 and sets the source of the first transistor T1 to the voltage corresponding to the PWMD signal.

[0070] In practical applications, when the above-mentioned row scanning signal SN represents the current working stage of the micro LED driving circuit as the scanning stage, the fourth transistor T4 is turned on, and the gate and drain of the first transistor T1 are connected through the turned-on fourth transistor T4 to form a diode structure, so that the gate voltage of the first transistor T1 is equal to the drain voltage of the first transistor T1.

[0071] It is understandable that during the comparison and emission phase, as the first comparison reference signal SWEEP1 continuously increases, the gate voltage of the first transistor T1 gradually increases. The gate voltage of the first transistor T1 can be expressed as PWMD+V th1 +ΔSWEEP1, where ΔSWEEP1 is the change in the first comparison reference signal SWEEP1. When PWMD+V th1 +ΔSWEEP is less than VGH+V th1 When the first transistor T1 is turned on, the output terminal of the signal generation module 10 is connected to the first power supply voltage VGH via the turned-on first transistor T1 and the turned-on second transistor T2. The output terminal of the signal generation module 10 is connected to the first capacitor C1. Through the action of the first capacitor C1, the voltage at the output terminal of the signal generation module 10 is stabilized, and the output terminal of the signal generation module 10 outputs a drive signal in the second level state. When PWMD+V th1 +ΔSWEEP1 is greater than VGH+V th1 When the third transistor T3 is turned off, the output terminal of the signal generation module 10 is connected to the first capacitor C1. The second comparison reference signal SWEEP2 is small. Through the coupling effect of the first capacitor C1, the voltage at the output terminal of the signal generation module 10 decreases, and the output terminal of the signal generation module 10 outputs a drive signal of the first level state.

[0072] In this embodiment, during the horizontal scanning phase, the third transistor T3 and the fourth transistor T4 compensate the threshold voltage of the first transistor T1 based on the horizontal scanning signal SN; during the comparison light emission phase, the second transistor T2 turns on in response to the light emission control signal EM, compares the gate voltage of the first transistor T1 with the sum of the source voltage and the threshold voltage of the first transistor T1, and outputs the aforementioned driving signal through the output terminal of the signal generation module 10 based on the comparison result.

[0073] Optionally, regarding the comparison generation unit 101, in one possible implementation, Figure 5 This is a schematic diagram of another micro LED driving circuit provided in Embodiment 1 of this application, as shown below. Figure 5 As shown, the signal generation module 10 also includes: a second capacitor C2;

[0074] One end of the second capacitor C2 receives the first comparison reference signal SWEEP1, and the other end of the second capacitor C2 is connected to the gate of the first transistor T1.

[0075] Referring to the above example, during the row scanning phase, the comparison generation unit 101 receives the PWMD signal through its input terminal based on the row scanning signal SN, so that the source voltage of the first transistor T1 is the voltage corresponding to the PWMD signal, and the gate and drain of the first transistor T1 are connected. For example, at the beginning of the row scanning phase, the gate voltage of the first transistor T1 is higher than PWMD+V. th1 The gate of the first transistor T1 discharges into the second capacitor C2 until the gate voltage of the third transistor T3 is PWMD+V. th1 This achieves compensation for the threshold voltage of the first transistor T1. Optionally, at the start of the row scan phase, the gate voltage of the first transistor T1 is lower than PWMD+V. th1 The second capacitor C2 discharges into the gate of the first transistor T1 until the gate voltage of the first transistor T1 is PWMD+V. th1 This achieves compensation for the threshold voltage of the first transistor T1.

[0076] In practical applications, during the comparison light emission stage, the first transistor T1 receives the first comparison reference signal SWEEP1 via the second capacitor C2. As the first comparison reference signal SWEEP1 increases, the gate voltage of the first transistor T1 increases. The comparison generation unit 101 compares the gate voltage of the first transistor T1 with the sum of the source voltage and the threshold voltage of the first transistor T1, and outputs the aforementioned driving signal through the output terminal of the signal generation module 10 based on the comparison result.

[0077] In this embodiment, the gate of the first transistor T1 receives the first comparison reference signal SWEEP1 via the second capacitor C2. During the row scanning phase, the threshold voltage of the first transistor T1 is compensated through the second capacitor C2. During the comparison light emission phase, as the first comparison reference signal SWEEP1 decreases, the gate voltage of the second capacitor C2 decreases due to the coupling effect. The driving signal is obtained by comparing the sum of the gate voltage of the first transistor T1, the source voltage of the first transistor T1, and the threshold voltage of the first transistor T1.

[0078] Optionally, regarding the signal generation module 10, in one possible implementation, the signal generation module 10 further includes: an initialization unit;

[0079] The initialization unit is connected to the first transistor T1 and is used to receive the reset signal RESET and initialize the micro LED circuit based on the reset signal RESET.

[0080] The reset signal RESET is used to indicate whether the current operating stage of the micro LED driver circuit is the reset stage. For example, when the reset signal RESET is in the first level state, the current operating stage of the micro LED driver circuit is the reset stage; when the reset signal RESET is in the second level state, the current operating stage of the micro LED driver circuit is not the reset stage.

[0081] Specifically, when the reset signal RESET indicates that the working stage of the micro LED driver circuit is the reset stage, the initialization unit initializes the micro LED driver circuit.

[0082] In this embodiment, the initialization unit responds to the reset signal RESET and can initialize the micro LED driver circuit during the reset phase.

[0083] Optionally, regarding the signal generation module 10, in one possible implementation, the initialization unit includes: a fifth transistor;

[0084] The source of the fifth transistor is connected to the reference power supply voltage REF, the gate of the fifth transistor receives the reset signal RESET, and the drain of the fifth transistor is connected to the gate of the first transistor T1, which is used to turn on or off in response to the reset signal RESET.

[0085] It can be understood that when the reset signal RESET indicates that the current working stage of the micro LED driving circuit is the reset stage, the fifth transistor is turned on, and the gate of the first transistor T1 is connected to the aforementioned reference power supply voltage REF through the turned-on fifth transistor, that is, the gate voltage of the fifth transistor is set to the reference power supply voltage REF.

[0086] In the micro LED driving circuit provided in this embodiment, the signal generation module includes a first capacitor. The signal generation module receives a light emission control signal and a first comparison reference signal, and outputs a driving signal based on the light emission control signal and the first comparison reference signal. One end of the first capacitor is connected to the output terminal of the signal generation module, and the other end of the first capacitor receives a second comparison reference signal. The first comparison reference signal is a linearly increasing ramp signal, and the second comparison signal is the inverted signal of the first comparison reference signal. The driving module is connected to the signal generation module. One end of the driving module is connected to the power supply signal, and the other end of the driving module is connected to the micro LED. The driving signal is used to control the on or off duration of the driving module to control the output duration of the on current. The micro LED is connected to the driving module to receive the on current and the light emission control signal, and emits light in response to the light emission control signal and the control of the on current. In this embodiment, the second comparison reference signal and the first comparison reference signal are applied synchronously and are out of phase. During the comparison and illumination stage, when the first comparison reference signal is small, the signal generation module outputs a second-level driving signal, and the micro LED emits light. At this time, the internal transistor of the signal generation module conducts, transmitting the power supply voltage to the output terminal of the signal generation module. The output terminal of the signal generation module receives the second comparison reference signal through the first capacitor, ensuring that there is no direct conductive path within the signal generation module, resulting in a small internal current. Conversely, when the first comparison reference signal is large, the second comparison reference signal is small, and the signal generation module generates a first-level driving signal, preventing the micro LED from emitting light. In this case, the internal transistor of the signal generation module is not conducting, and there is no current. The output terminal of the signal generation module receives the second comparison reference signal through the first capacitor, which can adjust the voltage at the output terminal of the signal generation module to output the first-level driving signal. In practice, the small current within the signal generation module when the micro LED is emitting light and the absence of current when the micro LED is not emitting light reduce the power consumption of the micro LED driving circuit.

[0087] Example 2

[0088] Figure 6 This is a schematic diagram of a micro LED driving circuit provided in Embodiment 2 of this application, as shown below. Figure 6 As shown, the driving module 11 includes a driving transistor T0.

[0089] The control terminal of the driving transistor T0 is connected to the output terminal of the signal generation module 10, the source of the driving transistor T0 is connected to the power supply signal VDD, and the drain of the driving transistor T0 is connected to the micro LED 12.

[0090] In practical applications, the control terminal of the driving transistor T0 is connected to the output terminal of the signal generation module 10 to receive the driving signal. The driving transistor T0 turns on or off in response to the driving signal. In one example, the driving transistor T0 turns on in response to a driving signal at a second level and turns off in response to a driving signal at a first level. Specifically, when the driving signal output by the signal generation module 10 is at the second level, the driving transistor T0 turns on, and the micro LED 12 emits light; when the driving signal output by the signal generation module 10 is at the first level, the driving transistor T0 turns off, and the micro LED 12 turns off.

[0091] In this embodiment, the driving module includes a driving transistor. The control terminal of the driving transistor is connected to the output terminal of the signal generation module. The source of the driving transistor is connected to the power supply signal, and the drain of the driving transistor is connected to the micro LED. Based on the driving signal, the driving module controls the turning on and off of the driving transistor, thereby controlling the conduction time of the micro LED.

[0092] Optionally, in one possible implementation, Figure 7 This is a schematic diagram of another micro LED driving circuit provided in Embodiment 2 of this application, as shown below. Figure 7 As shown, the drive module 11 also includes: a sixth transistor T6, a seventh transistor T7, and an eighth transistor T8;

[0093] The source of the sixth transistor T6 is connected to the first power supply voltage VGH, the gate of the sixth transistor T6 receives the light emission control signal EM, and the drain of the sixth transistor T6 is connected to the source of the seventh transistor T7, for turning on or off in response to the light emission control signal EM.

[0094] The gate of the seventh transistor T7 is connected to the output terminal of the signal generation module 10, and the drain of the seventh transistor T7 is connected to the source of the eighth transistor T8 and the control terminal of the driving transistor T0, in order to turn on or off in response to the aforementioned driving signal.

[0095] The gate of the eighth transistor T8 receives the row scan signal SN, and the source of the eighth transistor T8 receives the PAMD signal, which is used to turn on or off in response to the row scan signal SN.

[0096] Referring to the above example, the light emission control signal EM is used to control whether the operating stage of the micro LED driver circuit is the comparison light emission stage. When the light emission control signal EM indicates that the current operating stage of the micro LED driver circuit is the comparison light emission stage, the sixth transistor T6 is turned on and transmits the first power supply voltage VGH to the source of the seventh transistor T7; when the light emission control signal EM indicates that the current operating stage of the micro LED driver circuit is not the comparison light emission stage, the sixth transistor T6 is turned off.

[0097] In practical applications, the output of the signal generation module 10 is used to output the aforementioned drive signal to the seventh transistor T7. Referring to the above example, the conduction and cutoff of the seventh transistor T7 can be controlled based on the level state of the drive signal. When the PWM signal is at the second level, the seventh transistor T7 is turned off; when the PWM signal is at the first level, the seventh transistor T7 is turned on.

[0098] It can be understood that during the horizontal scanning phase, when the eighth transistor T8 is turned on, the voltage at the control terminal of the driving transistor T0 is set to the voltage value corresponding to the PAMD signal. During the comparison-based light-emitting phase, when the seventh transistor T7 is turned off, the voltage at the control terminal of the driving transistor T0 is the voltage value corresponding to the PAMD signal, the driving transistor T0 is turned on, the driving module 11 outputs the conduction current, and the miniature LED 12 emits light. Correspondingly, during the comparison-based light-emitting phase, when the sixth transistor T6 is turned on and the driving signal level is at the first level, when the seventh transistor T7 is turned on, the aforementioned first power supply voltage VGH is transmitted to the drain of the seventh transistor T7, i.e., the control terminal of the driving transistor T0, through the turned-on sixth transistor T6 and the turned-on seventh transistor T7. When the driving transistor T0 is turned off, the driving module 11 stops outputting the conduction current, and the miniature LED 12 stops emitting light.

[0099] In this embodiment, the seventh transistor T7 responds to the above-mentioned drive signal to turn on or off, and controls the drive transistor T0 to turn on or off, thereby realizing the control of the output duration of the conduction current.

[0100] Optionally, in one possible implementation, Figure 8 This is a schematic diagram of another micro LED driving circuit provided in Embodiment 2 of this application, as shown below. Figure 8 As shown, the drive module 11 also includes: a ninth transistor T9;

[0101] In this configuration, the gate of the ninth transistor T9 receives the aforementioned light-emitting control signal EM, the source of the ninth transistor T9 is connected to the aforementioned power supply signal VDD, and the drain of the ninth transistor T9 is connected to the source of the aforementioned driving transistor T0. This configuration is used to respond to the aforementioned light-emitting control signal EM and control the connection and disconnection of the aforementioned driving transistor T0 and the aforementioned power supply signal VDD.

[0102] Based on the above example, the on / off state of the driving transistor T0 is related to the output of the conduction current. When the driving transistor T0 is turned on during the non-comparison emission stage, it affects the accuracy of the micro-LED 12's emission. It can be understood that by placing a ninth transistor T9 between the source of the driving transistor T0 and the aforementioned power supply signal VDD, if the current operating stage of the micro-LED driving circuit is the comparison emission stage, the ninth transistor T9 is turned on, and the source of the driving transistor T0 and the aforementioned power supply signal VDD are connected via the ninth transistor T9. If the current operating stage of the micro-LED driving circuit is not the comparison emission stage, the ninth transistor T9 is turned off, and the source of the driving transistor T0 cannot be connected to the aforementioned power supply signal VDD, thus preventing the micro-LED 12 from emitting light due to the conduction of the driving transistor T0 during the non-comparison emission stage. This embodiment improves the accuracy of the micro-LED 12's emission.

[0103] Optionally, in one possible implementation, the drive module 11 further includes: a third capacitor;

[0104] One end of the third capacitor is connected to the aforementioned power supply signal VDD, and the other end of the third capacitor is connected to the control terminal of the aforementioned driving transistor T0.

[0105] In conjunction with the above example, the driving module 11 is connected to the signal generation module 10 and receives the driving signal; when the driving signal is in the second level state, the driving transistor T0 is turned on, and when the driving signal is in the first level state, the driving transistor T0 is turned off.

[0106] In this embodiment, the signal at the control terminal of the driving transistor T0 can be filtered by the third capacitor to ensure the voltage at the control terminal of the driving transistor T0 is stable, thereby achieving accurate control of the driving transistor T0.

[0107] In this embodiment, the driving module includes a driving transistor. The control terminal of the driving transistor is connected to the output terminal of the signal generation module. The source of the driving transistor is connected to the power supply signal, and the drain of the driving transistor is connected to the micro LED. Based on the driving signal, the driving module controls the turning on and off of the driving transistor, thereby controlling the conduction time of the micro LED.

[0108] Example 3

[0109] Figure 9 This is a schematic diagram of a micro LED driving circuit provided in Embodiment 3 of this application, as shown below. Figure 9 As shown, this embodiment provides a micro LED driving circuit, including: a signal generation module 10, a driving module 11, and a micro LED 12.

[0110] In this embodiment, the signal generation module 10 includes: a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a first capacitor C1, and a second capacitor C2; the driving module 11 includes: a driving transistor T0, a sixth transistor T6, a seventh transistor T7, an eighth transistor T8, a ninth transistor T9, and a third capacitor C3. The reset signal is RESET, the row scan order signal is SN, the comparison reference signal is SWEEP, the light emission control signal is EM, the power supply signal is VDD, the first power supply voltage is VGH, and the reference power supply voltage is REF.

[0111] Optionally, in one example, the transistor is turned on in response to a signal in a first level state and turned off in response to a signal in a second level state.

[0112] For example, the transistors described above are all P-type thin-film transistors, with a first level state being low and a second level state being high. Correspondingly, the anode of the micro LED 12 is connected to the drain of the driving transistor T0, and the anode of the micro LED 12 receives the light-emitting control signal EM.

[0113] Optionally, all of the above transistors are N-type thin-film transistors, with a first level state being high and a second level state being low.

[0114] Optionally, in one example, the operation of the above-mentioned micro LED driving circuit is divided into three stages: initialization stage, row scanning stage, and comparison light emission stage.

[0115] In this example, during the initialization phase, the reset signal RESET is at a first level, and the row scan signal SN and the light emission control signal EM are at a second level. During the row scan phase, the row scan signal SN first changes from the second level to the first level, and then changes from the first level to the second level; the reset signal RESET and the light emission control signal EM are at the second level. During the comparison and light emission phase, the light emission control signal EM is at the first level, and the reset signal RESET and the row scan signal SN are at the second level.

[0116] To facilitate understanding of the operation of the micro LED driving circuit, the embodiments of this application are described below with reference to examples. For example, the transistors described above are all P-type thin-film transistors, which turn on in response to a low-level signal and turn off in response to a high-level signal. The states of each signal are as follows: Figure 10 As shown, Figure 10 This is a signal state diagram provided for Embodiment 3 of this application.

[0117] Combination Figure 9 and Figure 10During the initialization phase, the reset signal RESET is at a low level, while the row scan signal SN and the light emission control signal EM are at a high level. The fifth transistor T5 turns on in response to the reset signal, while the other transistors turn off. The turn-on of the fifth transistor T5 sets the gate voltage of the first transistor T1 to the reference power supply voltage REF.

[0118] Combination Figure 9 and Figure 10 During the row scanning phase, the row scanning signal SN first changes from a high level to a low level, and then from a low level to a high level; the reset signal RESET and the light control signal EM are both at a high level; the third transistor T3, the fourth transistor T4, and the eighth transistor T8 turn on and then turn off in response to the row scanning signal SN, while the first transistor T1 turns on and the other transistors turn off. When the third transistor T3 turns on, it sets the source voltage of the first transistor T1 to PWMD; when the fourth transistor T4 turns on, the gate and drain of the first transistor T1 are connected, forming a diode structure between points A and B; the second capacitor C2 sets the gate voltage and drain voltage of the first transistor T1 to PwMD+V. th1 The eighth transistor T8 is turned on, setting the voltage at the control terminal of the driving transistor T0 to PAMD.

[0119] Combination Figure 9 and Figure 10 During the aforementioned light-emitting phase, the light-emitting control signal EM is at a low level, while the reset signal and the line scan signal SN are at a high level. The second transistor T2, the sixth transistor T6, and the ninth transistor T9 are turned on in response to the light-emitting control signal EM, while the third transistor T3, the fourth transistor T4, and the eighth transistor T8 are turned off in response to the line scan signal SN.

[0120] Specifically, as the first comparison reference signal SWEEP1 increases, the gate voltage of the first transistor T1 increases, and when PWMD+V th1 +ΔSWEEP1 is less than VGH+V th1 When the first transistor T1 is turned on, the output terminal of the signal generation module 10 is connected to the first power supply voltage VGH via the turned-on first transistor T1 and second transistor T2. The second comparison reference signal SWEEP2 decreases, and VGH charges the first capacitor C1 via the turned-on first transistor T1 and second transistor T2. The voltage at the output terminal of the signal generation module 10 remains stable, and the signal generation module 10 outputs a high-level drive signal. The seventh transistor T7 is turned off, the voltage of the drive transistor T0 is PAMD, the drive transistor T0 is turned on, and the micro LED 12 emits light.

[0121] Correspondingly, when PWMD+V th1 +ΔSWEEP1 is greater than VGH+V th1 When the first transistor T1 is turned off, the output terminal of the signal generation module 10 is connected to the first capacitor C1. At this time, the second comparison reference signal SWEEP2 is small. Through the coupling effect of the first capacitor C1, the voltage at the output terminal of the signal generation module 10 is reduced. The signal generation module 10 outputs a low-level drive signal, the seventh transistor T7 is turned on, and the control terminal of the drive transistor T0 is connected to the first power supply voltage VGH through the turned-on seventh transistor T7 and the turned-on sixth transistor T6. The drive transistor T0 is turned off, and the miniature LED 12 stops emitting light.

[0122] In the micro LED driving circuit provided in this embodiment, the signal generation module receives a light emission control signal, a first comparison reference signal, and a second comparison reference signal, and outputs a driving signal based on the light emission control signal, the first comparison reference signal, and the second comparison reference signal; wherein, the first comparison reference signal is a linearly increasing ramp signal; the second comparison signal is the inverted signal of the first comparison reference signal; the driving module is connected to the signal generation module, one end of the driving module is connected to the power supply signal, and the other end of the driving module is connected to the micro LED; wherein, the driving signal is used to control the on or off duration of the driving module, so as to control the output duration of the on current; the micro LED is connected to the driving module, and is used to receive the on current and the light emission control signal, and emit light in response to the light emission control signal and the control of the on current. In this embodiment, the second comparison reference signal and the first comparison reference signal are applied synchronously and are out of phase. During the comparison and illumination stage, when the first comparison reference signal is small, the signal generation module outputs a second-level driving signal, and the micro LED emits light. At this time, the internal transistor of the signal generation module conducts, transmitting the power supply voltage to the output terminal of the signal generation module. The output terminal of the signal generation module receives the second comparison reference signal through the first capacitor, ensuring that there is no direct conductive path within the signal generation module, resulting in a small internal current. Conversely, when the first comparison reference signal is large, the second comparison reference signal is small, and the signal generation module generates a first-level driving signal, preventing the micro LED from emitting light. In this case, the internal transistor of the signal generation module is not conducting, and there is no current. The output terminal of the signal generation module receives the second comparison reference signal through the first capacitor, which can adjust the voltage at the output terminal of the signal generation module to output the first-level driving signal. In practice, the small current within the signal generation module when the micro LED is emitting light and the absence of current when the micro LED is not emitting light reduce the power consumption of the micro LED driving circuit.

[0123] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0124] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A micro-LED driving circuit, characterized in that, The micro-LED driving circuit comprises a signal generation module, a driving module and a micro-LED. The signal generation module comprises a first capacitor, receives a light-emitting control signal and a first comparison reference signal, and outputs a driving signal based on the light-emitting control signal and the first comparison reference signal. One end of the first capacitor is connected to an output end of the signal generation module, and the other end of the first capacitor receives a second comparison reference signal; the first comparison reference signal is a linearly rising ramp signal; the second comparison reference signal and the first comparison reference signal are synchronously applied, and the second comparison reference signal is an inverse signal of the first comparison reference signal; The driving module is connected to the signal generation module, one end of the driving module is connected to a power supply signal, and the other end of the driving module is connected to the micro-LED; wherein the driving signal is used to control the on or off time length of the driving module to control the output time length of the on current; The micro-LED is connected to the driving module, used to receive the on current and the light-emitting control signal, and respond to the light-emitting control signal and the control of the on current to emit light. The signal generation module further comprises a first transistor and a comparison generation unit; the gate of the first transistor receives the first comparison reference signal, the source of the first transistor is connected to the input end of the comparison generation unit, and the drain of the first transistor is connected to the output end of the signal generation module and the first capacitor.

2. The micro-LED driving circuit according to claim 1, wherein The comparison generation unit receives a row scanning signal, and is used to receive a PWMD signal through the input end of the comparison generation unit based on the row scanning signal, so that the source voltage of the first transistor is the voltage corresponding to the PWMD signal, and the gate of the first transistor is connected to the drain of the first transistor; and The comparison generation unit receives the light-emitting control signal, and is used to connect a first power voltage through the input end of the comparison generation unit based on the light-emitting control signal, so that the source voltage of the first transistor is the first power voltage, and the gate voltage of the first transistor is compared with the sum of the threshold voltage of the first transistor and the source voltage of the first transistor, and the driving signal is output through the output end of the comparison generation module based on the comparison result. The comparison generation unit comprises a second transistor, a third transistor and a fourth transistor; 3. The micro-LED driving circuit of claim 2, wherein, The source of the second transistor is connected to the first power voltage, the gate of the second transistor receives the light-emitting control signal, and the drain of the second transistor is connected to the source of the third transistor and the source of the first transistor, and is used to be turned on or turned off in response to the light-emitting control signal; The gate of the third transistor receives the row scanning signal, and the drain of the third transistor receives the PWMD signal, and is used to be turned on or turned off in response to the row scanning signal. ​ A gate of the fourth transistor receives the row scanning signal, a source of the fourth transistor is connected with the gate of the first transistor, and a drain of the fourth transistor is connected with the drain of the first transistor, for turning on or turning off in response to the light emitting control signal.

4. The micro-LED driving circuit of claim 2, wherein, The signal generation module further comprises a second capacitor. One end of the second capacitor receives the first comparison reference signal, and the other end of the second capacitor is connected with the gate of the first transistor.

5. The micro-LED driving circuit of claim 1, wherein, The signal generation module further comprises an initialization unit. The initialization unit is connected with the first transistor, for receiving a reset signal and initializing the micro-LED circuit based on the reset signal.

6. The micro-LED driving circuit of claim 5, wherein, The initialization unit comprises a fifth transistor. A source of the fifth transistor is connected with a reference power supply voltage, a gate of the fifth transistor receives the reset signal, and a drain of the fifth transistor is connected with the gate of the first transistor, for turning on or turning off in response to the reset signal.

7. The micro-LED driving circuit of claim 1, wherein, The driving module comprises a driving transistor. A control end of the driving transistor is connected with an output end of the signal generation module, a source of the driving transistor is connected with the power supply signal, and a drain of the driving transistor is connected with the micro-LED.

8. The micro-LED driving circuit of claim 7, wherein, The driving module further comprises a sixth transistor, a seventh transistor and an eighth transistor. A source of the sixth transistor is connected with a first power supply voltage, a gate of the sixth transistor receives the light emitting control signal, and a drain of the sixth transistor is connected with a source of the seventh transistor, for turning on or turning off in response to the light emitting control signal. A gate of the seventh transistor is connected with the output end of the signal generation module, a drain of the seventh transistor is connected with a source of the eighth transistor and the control end of the driving transistor, for turning on or turning off in response to the driving signal. A gate of the eighth transistor receives a row scanning signal, and a source of the eighth transistor receives a PAMD signal, for turning on or turning off in response to the row scanning signal.

9. The micro-LED driving circuit of claim 7, wherein, The driving module further comprises a ninth transistor. A gate of the ninth transistor receives the light emitting control signal, a source of the ninth transistor is connected with the power supply signal, and a drain of the ninth transistor is connected with the source of the driving transistor, for controlling the connection and disconnection of the driving transistor and the power supply signal in response to the light emitting control signal.

10. The micro-LED driving circuit of claim 7, wherein, The driving module further comprises a third capacitor. One end of the third capacitor is connected with the power supply signal, and the other end of the third capacitor is connected with the control end of the driving transistor.

11. The micro-LED driving circuit according to any one of claims 1-10, wherein, The first transistor to the ninth transistor are turned on in response to a signal of a first level state and are turned off in response to a signal of a second level state.

12. The micro-LED driving circuit according to any one of claims 1-10, wherein, The signal generation module further comprises an initialization unit connected with the first transistor for receiving a reset signal; the comparison generation unit receives a row scanning signal, for receiving a PWMD signal based on the row scanning signal, and a working phase of the micro-LED unit circuit is divided into an initialization phase, a row scanning phase and a comparison light emitting phase. In the initialization stage, the reset signal is in a first level state, the row scanning signal and the light emitting control signal are in a second level state; the first level state control signal is turned on; the second level state control signal is turned off; In the row scanning stage, the row scanning signal is changed from the second level state to the first level state, and then is changed from the first level state to the second level state; the reset signal and the light emitting control signal are in the second level state; In the comparison light emitting stage, the light emitting control signal is in the first level state, and the reset signal and the row scanning signal are in the second level state.

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