Voltage stabilization circuit and display panel

Abstract

This application discloses a voltage stabilization circuit and a display panel, which belong to the technical field of display. The voltage stabilization circuit provided by this application includes a light emitting module (10), a driving module (20), a comparison module (30), a selection module (40), a first switching module (50), and a second switching module (60). The driving module (20) supplies a driving voltage (Vdd) to the light emitting module (10). The comparison module (30) compares the magnitude of the driving voltage (Vdd) with a reference voltage (Vref) to generate an output signal. The selection module (40) outputs a forward high voltage (VGH) or a reverse low voltage (VGL).

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application filed on August 29, 2022, bearing application number 202211050613.7, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of displays, and in particular to voltage stabilizing circuits and display panels. [Background technology]

[0003] The material discussed herein is merely intended to provide background information related to the present application and does not necessarily constitute prior art.

[0004] In the prior art, because the distances from the data lines to the near and far ends of the display panel are different, the speed at which the driving voltage Vdd of the micro-led (light-emitting diode) rises between the near and far ends of the display panel may differ, and the performance of the micro-leds at the near and far ends of the display panel may not be uniform. For example, when the power is turned on, the screen may flicker due to an unstable rise in Vdd inside the panel. Also, when the power is turned off, the screen may flicker due to an unstable drop in Vdd inside the panel. Summary of the Invention [Problem to be solved by the invention]

[0005] The main objective of this application is to provide a voltage stabilization circuit and a display panel, which aims to solve the technical problem of how to make the performance of micro LEDs at the near and far ends of the display panel uniform and avoid screen flicker on the display panel. [Means for solving the problem]

[0006] In order to achieve the above object, the present application provides a voltage stabilization circuit, the voltage stabilization circuit comprising: A light emitting module; a driving module, which receives a scanning signal and a driving voltage and is used for providing the driving voltage to the light emitting module under the control of the scanning signal; a comparison module connected to the driving module, receiving the driving voltage and a reference voltage, and used for comparing the magnitude of the driving voltage and the reference voltage to generate an output signal; a selection module connected to the comparison module, receiving a high forward voltage and a low reverse voltage, and used to output the high forward voltage or the low reverse voltage under the control of the output signal; a first switching module connected to the light emitting module, the driving module and the selection module, and used to turn on a circuit connection between the driving module and the light emitting module by controlling the forward high voltage, or turn off a circuit connection between the driving module and the light emitting module by controlling the reverse low voltage; and a second switching module connected to the driving module, the first switching module, and the selection module, receiving a data voltage and used to output the data voltage to the driving module by controlling the forward high voltage, or to prevent the data voltage from entering the driving module by controlling the reverse low voltage.

[0007] In order to achieve the above object, the present application further provides a display panel including the above voltage stabilization circuit. Beneficial effects

[0008] This application proposes a voltage stabilization circuit and a display panel. According to this application, the driving circuit of the micro LED is optimized to obtain a voltage stabilization circuit including a light emitting module, a driving module, a comparison module, a selection module, a first switching module, and a second switching module. Since the delay time of the blinking between each micro LED in the display panel is difficult to sense with the naked eye, according to this application, by combining the above modules and setting a reference voltage as the judgment threshold of the driving voltage, the on-off timing of the micro LED in the entire display panel is changed, and more time is given to the rise or fall of the driving voltage at the far end, and only when the driving voltage meets the conditions, the micro LED is turned on and emits light. This avoids the situation where the micro LED gradually becomes brighter from a weak light emission while the amplitude of the driving voltage is insufficient, and effectively avoids the problem of the screen flickering when the power is turned on and off.

[0009] In addition, based on this voltage stabilization circuit, by simply fine-tuning some input parameters, the function of overvoltage protection can also be realized, and when the voltage of one light-emitting diode is abnormal, the light-emitting diode can be turned off, and then turned on again after the voltage recovers to normal, thereby realizing precise control over a single light-emitting diode and functioning as flexible protection during the operation of the display panel, and avoiding the technical defect of having to shut down the entire display panel for traditional overvoltage protection.

[0010] In order to more clearly describe the technical solutions of the embodiments of the present application and the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. It is obvious that the accompanying drawings in the following description are only some of the embodiments of the present application, and those skilled in the art can obtain other accompanying drawings according to the structures shown in these accompanying drawings without creative work. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a functional module of a voltage stabilizing circuit according to an embodiment of the present invention; [Diagram 2]1 is a schematic diagram showing a circuit configuration of a voltage stabilizing circuit according to an embodiment of the present invention; [Diagram 3] FIG. 2 is a schematic diagram of a circuit configuration of a voltage stabilizing circuit according to another embodiment of the present invention. [Figure 4] 1 is a structural schematic diagram of a display panel according to an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The realization of the object, the function features and advantages of the present invention will be further explained in combination with the embodiments with reference to the attached drawings.

[0013] It should be understood that the specific embodiments described herein are used only to interpret the present application, and are not used to limit the present application.

[0014] An embodiment of the present application provides a voltage stabilizing circuit, and reference is made to FIG. 1, which is a functional module schematic diagram of an embodiment of the voltage stabilizing circuit of the present application.

[0015] In this embodiment, the voltage stabilizing circuit includes: A light emitting module 10; a driving module 20, which receives a scanning signal Scan and a driving voltage Vdd and is used to supply the driving voltage Vdd to the light emitting module 10 under control of the scanning signal Scan; a comparison module 30 connected to the driving module 20, receiving the driving voltage Vdd and a reference voltage Vref, and used for comparing the magnitude of the driving voltage Vdd and the reference voltage Vref to generate an output signal; a selection module 40 connected to the comparison module 30, receiving a forward high voltage VGH and a reverse low voltage VGL, and used to output the forward high voltage VGH or the reverse low voltage VGL under the control of the output signal; a first switching module 50 connected to the light emitting module 10, the driving module 20 and the selection module 40, for turning on the circuit connection between the driving module 20 and the light emitting module 10 by controlling the forward high voltage VGH, or turning off the circuit connection between the driving module 20 and the light emitting module 10 by controlling the reverse low voltage VGL; a second switching module 60 connected to the driving module 20, the first switching module 50 and the selection module 40, receiving a data voltage Vdata, and used to output the data voltage Vdata to the driving module 20 under control of the forward high voltage VGH, or to prevent the data voltage Vdata from entering the driving module 20 under control of the reverse low voltage VGL.

[0016] It should be noted that the voltage stabilizing circuit provided in this embodiment is set according to the number of micro leds in the display panel. That is, each micro led has its corresponding voltage stabilizing circuit. Here, the voltage stabilizing circuit does not need to be set in the near-end micro leds, but must be set in the far-end micro leds. The data voltage Vdata may be supplied from the data line, the reference voltage Vref from the register of the control chip, and the scan signal Scan, the forward high voltage VGH and the reverse low voltage VGL from the scan line.

[0017] Further, reference is made to FIG. 2, which is a schematic diagram of a circuit configuration of an embodiment of a voltage stabilizing circuit of the present invention.

[0018] As shown in FIG. 2, in some possible embodiments, the light emitting module 10 includes: The light emitting device includes a light emitting element MICRO LED having an anode terminal connected to the first switching module 50 and a cathode terminal electrically connected to a common ground terminal Vss, and the light emitting element MICRO LED may be a micro light emitting diode.

[0019] Further, in some possible embodiments, the drive module 20 may include: a first transistor T1, the gate of which receives the scan signal Scan and the source of which is connected to the second switching module 60; a second transistor T2, the gate of which is connected to the drain of the first transistor T1, the source of which is connected to the first switching module 50, and the drain of which receives the driving voltage Vdd; a capacitor C1 having one end connected to the drain of the first transistor T1 and the gate of the second transistor T2, and the other end connected to the source of the second transistor T2 and the switching module;

[0020] Further, in some possible embodiments, the comparison module 30 may: The driving voltage Vdd is input to a non-inverting input terminal, the reference voltage Vref is input to an inverting input terminal, and a voltage comparator U 1 has an output terminal connected to the selection module 40 .

[0021] Further, in some possible embodiments, the selection module 40 may further include: a third transistor T3, the gate of which is connected to the output terminal of the voltage comparator U1, the source of which is connected to the reverse low voltage VGL, and the drain of which is connected to the first switching module 50 and the second switching module 60; a fourth transistor T4 having a gate connected to the output terminal of the voltage comparator U1, a source to which the forward high voltage VGH is input, and a drain connected to the first switching module 50 and the second switching module 60.

[0022] In addition, the gate of the third transistor T3 and the gate of the fourth transistor T4 together constitute the input terminal of the selection module 40, and the drain of the third transistor T3 and the drain of the fourth transistor T4 together constitute the output terminal of the selection module 40.

[0023] In addition, a circuit obtained by swapping the input voltages of the non-inverting input terminal and the inverting input terminal of the voltage comparator U1 and swapping the input voltages of the sources of T3 and T4 is equivalent to the circuit provided by this embodiment and similarly falls within the scope of protection of this embodiment.

[0024] Furthermore, in some possible embodiments, the first switching module 50 may include: a fifth transistor T5 having a gate connected to the drain of the third transistor T3 and the drain of the fourth transistor T4, a source connected to the source of the second transistor T2 and the other end of the capacitor C1, and a drain connected to the anode terminal of the light-emitting element MICRO LED;

[0025] Furthermore, in some possible embodiments, the second switching module 60 may include: The sixth transistor T6 has a gate connected to the drain of the third transistor T3, the drain of the fourth transistor T4, and the gate of the fifth transistor T5, a source to which the data voltage Vdata is input, and a drain connected to the source of the first transistor T1.

[0026] In addition, the transistors employed in all the embodiments of this specification may be TFTs (Thin Film Transistors), field effect transistors, or other elements having the same characteristics, and the transistors used in this specification have symmetrical sources and drains, so the sources and drains may be interchanged. In the embodiments of this specification, in order to distinguish between the two poles of the transistors other than the gates, one pole is called the source and the other pole is called the drain. In this embodiment, the second transistor T2 operates in the amplification region, and all the other transistors operate in the cutoff region or saturation region. In FIG. 2, the port characteristics of the second transistor T2 can be specified from the symbols G, D, and S in the figure, where G is the gate of T2, S is the source of T2, and D is the drain of T2. The remaining transistors may be specified such that the intermediate terminal of each transistor is the gate, the signal input terminal is the source, and the signal output terminal is the drain, according to the form in FIG. 2.

[0027] In addition, the transistors employed in the embodiments of the present application may include two types of transistors: P-type transistors that are turned on when the gate is at a low level and turned off when the gate is at a high level, and N-type transistors that are turned on when the gate is at a high level and turned off when the gate is at a low level.

[0028] In addition, in some possible embodiments, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5 and the sixth transistor T6 may be low-temperature polysilicon thin film transistors, oxide semiconductor thin film transistors, or amorphous silicon thin film transistors. By making the transistors in the driving circuit provided in the embodiments of the present application transistors of the same material, it is possible to avoid the difference between transistors of different materials from affecting the driving circuit.

[0029] Further, in some possible embodiments, when the scanning signal Scan is at a high level, the first transistor T1 is turned on, and when the driving voltage Vdd is smaller than the reference voltage Vref, the voltage comparator U1 outputs a low level, the third transistor T3 is turned on, the fourth transistor T4 is turned off, the selection module 40 outputs a reverse low voltage VGL, the fifth transistor T5 is turned off, the sixth transistor T6 is turned off, the second transistor T2 is turned off, and the light emitting element MICRO LED is turned off and does not emit light.

[0030] Further, in some possible embodiments, when the scanning signal Scan is at a high level, the first transistor T1 is turned on, and when the driving voltage Vdd is greater than the reference voltage Vref, the voltage comparator U1 outputs a high level, the third transistor T3 is turned off, the fourth transistor T4 is turned on, the selection module 40 outputs a forward high voltage VGH, the fifth transistor T5 is turned on, the sixth transistor T6 is turned on, the second transistor T2 is turned on, and the light emitting element MICRO LED is turned on to emit light.

[0031] In this embodiment, Vref is smaller than Vdd and close to Vdd, and when Vdd reaches Vref, the voltage is basically stable. When power is turned on, U1 voltage comparator outputs high level only when Vdd is larger than Vref. When power is turned on, when Vdd is smaller than Vref, U1 outputs low level, and at this time, T3 turns on, T4 turns off, and the selection module 40 outputs VGL to control T5 to turn off and T6 to turn off. At this stage, the current generated by Vdd cannot reach the micro led, and at the same time, the driving voltage Vdata also does not reach T2. Only when Vdd is larger than Vref, the Vdd current may reach the micro led to turn it off or emit light, thus avoiding the problem of screen flickering that occurs when power is turned on. During shutdown, when Vdd is less than Vref, U1 outputs low level, turns on T3, turns off T4, and the selection module 40 outputs VGL, turns off T5, and turns off T6, so that the light-emitting diode micro led is completely isolated from Vdd. At this time, no matter how the waveform of Vdd changes, it will not affect the light-emitting state of the micro led, so the screen flicker problem that occurs during the shutdown phase is avoided.

[0032] This embodiment proposes a voltage stabilization circuit. According to this embodiment, the driving circuit of the micro LED is optimized to obtain a voltage stabilization circuit including a light emitting module, a driving module, a comparison module, a selection module, a first switching module, and a second switching module. Since the delay time of the blinking between each micro LED in the display panel is difficult to sense with the naked eye, according to this embodiment, by combining the above modules and setting a reference voltage as the judgment threshold of the driving voltage, the on-off timing of the micro LED in the entire display panel is changed, and more time is given to the rise or fall of the driving voltage at the far end, and only when the driving voltage meets the conditions, the micro LED is turned on and emits light. This avoids the situation where the micro LED gradually becomes brighter from a weak light emission without sufficient amplitude of the driving voltage, and effectively avoids the problem of the screen flickering when the power is turned on and off.

[0033] Also, please refer to FIG. 3, which is a schematic diagram of a circuit configuration of another embodiment of the voltage stabilizing circuit of the present application.

[0034] The difference between FIG. 3 and FIG. 2 is that the input positions of VGH and VGL are swapped. In this embodiment, a reference voltage Vref larger than the driving voltage Vdd is set, and when an overvoltage occurs in the driving voltage Vdd, T3 turns off and T4 turns on. At this time, the selection module 40 outputs VGL and controls T5 and T6 to turn off, thereby ensuring that no current flows through the light-emitting diodes. On the other hand, if one such circuit is installed for each light-emitting diode, when an overvoltage occurs in one light-emitting diode, only one light-emitting diode turns off. Visually, if the number of light-emitting diodes that turn off is small, it cannot be noticed by the naked eye, and when the voltage returns to normal, the light-emitting diodes can be restored to normal operation. According to this overvoltage protection method, the entire display panel does not go out, and functions to be flexibly protected.

[0035] This embodiment provides a voltage stabilization circuit, which provides overvoltage protection function for micro led, and can turn off one light emitting diode when the voltage of the light emitting diode is abnormal, and turn it on again after the voltage of the light emitting diode recovers to normal, thus realizing precise control over a single light emitting diode and functioning as flexible protection during the operation of the display panel, and avoiding the technical defect that the entire display panel needs to be shut down for traditional overvoltage protection.

[0036] In addition, the embodiment of the present application further proposes a display panel including the above voltage stabilizing circuit. Figure 4 is a structural schematic diagram of a display panel according to the embodiment of the present application.

[0037] As shown in FIG. 4, the display panel may include a processor 1001, for example a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is for realizing the connection and communication between these components. The user interface 1003 may include a display and an input means (for example, a keyboard), and preferably, the user interface 1003 may further include a standard wired interface and a wireless interface. Alternatively, the network interface 1004 may include a standard wired interface and a wireless interface (for example, a Wireless-Fidelity (Wi-FI) interface). The memory 1005 may be a high-speed random access memory (RAM), or a stable non-volatile memory (NVM), for example, a magnetic disk memory. The memory 1005 may be a storage device independent of the processor 1001.

[0038] Those skilled in the art will appreciate that the structure shown in FIG. 4 does not constitute a limitation on the display panel, and that the display panel may include more or fewer components than shown, or may combine some components or have different component arrangements.

[0039] As shown in FIG. 4, the memory 1005 as a kind of storage medium may include an operating system, a data storage module, a network communication module, a user interface module, and computer programs.

[0040] In the display panel shown in FIG. 4, the network interface 1004 mainly performs data communication with other devices, and the user interface 1003 mainly performs data exchange with the user. The processor 1001 and memory 1005 in this embodiment may be installed in the display panel, and the display panel controls the above-mentioned voltage stabilization circuit by calling up a computer program stored in the memory 1005 by the processor 1001.

[0041] Each embodiment of the display panel can refer to each embodiment of the voltage stabilizing circuit of the present application, and the description thereof will be omitted here.

[0042] As used herein, the terms "comprise," "include," or any other variation thereof, imply a non-exclusive inclusion such that a process, method, article, or system of a set of elements includes not only those elements but also other elements not expressly listed or including elements inherent in such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, article, or system that includes the element.

[0043] The numbers of the above embodiments of the present invention are for illustrative purposes only and do not indicate superiority or inferiority of the embodiments.

[0044] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be realized by adding a required general-purpose hardware platform to software (of course, hardware is also possible, but in many cases the former is a better implementation method). Based on this understanding, the technical solution of the present application, in its essence or in part contributing to the prior art, can be embodied in the form of a software product. The computer software product can be stored in the above-mentioned storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes several instructions that cause a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0045] The above are only some examples of the present application, which do not limit the scope of protection of the present application. Any equivalent structure or equivalent flow conversion made by utilizing the contents of the specification and drawings of the present application, or directly or indirectly applied to other related technical fields, shall be included in the scope of protection of the patent of the present application for the same reason.

Claims

1. A voltage stabilization circuit, comprising: A light emitting module (10); a driving module (20) to which a scanning signal (Scan) and a driving voltage (Vdd) are input, and which is used to supply the driving voltage (Vdd) to the light emitting module (10) under control of the scanning signal (Scan); a comparison module (30) connected to the driving module (20), receiving the driving voltage (Vdd) and a reference voltage (Vref), and used to compare the magnitude of the driving voltage (Vdd) and the reference voltage (Vref) to generate an output signal; a selection module (40) connected to the comparison module (30), receiving a forward high voltage (VGH) and a reverse low voltage (VGL), and used to output the forward high voltage (VGH) or the reverse low voltage (VGL) under the control of the output signal; a first switching module (50) connected to the light emitting module (10), the driving module (20) and the selection module (40), for turning on a circuit connection between the driving module (20) and the light emitting module (10) by controlling the forward high voltage (VGH) or turning off a circuit connection between the driving module (20) and the light emitting module (10) by controlling the reverse low voltage (VGL); a second switching module (60) connected to the driving module (20), the first switching module (50) and the selection module (40), receiving a data voltage (Vdata) and used to output the data voltage (Vdata) to the driving module (20) by controlling the forward high voltage (VGH) or to prevent the data voltage (Vdata) from entering the driving module (20) by controlling the reverse low voltage (VGL); When the scanning signal (Scan) is at a high level and the driving voltage (Vdd) is smaller than the reference voltage (Vref), the comparison module (30) outputs a low level, the selection module (40) outputs the reverse low voltage (VGL), the first switching module (50) is turned off, the second switching module (60) is turned off, and the light emitting module (10) is turned off and does not emit light; When the scanning signal (Scan) is at a high level and the driving voltage (Vdd) is greater than the reference voltage (Vref), the comparison module (30) outputs a high level, the selection module (40) outputs the forward high voltage (VGH), the first switching module (50) is turned on, the second switching module (60) is turned on, and the light emitting module (10) is turned on to emit light. Voltage stabilization circuit.

2. The light emitting module (10) comprises: A light emitting element (MICRO LED) whose anode terminal is connected to the first switching module (50) and whose cathode terminal is electrically connected to a common ground terminal (Vss).

2. The voltage regulation circuit of claim 1, comprising:

3. The drive module (20) a first transistor (T1) having a gate to which the scanning signal (Scan) is input and a source connected to the second switching module (60); a second transistor (T2) whose gate (G) is connected to the drain of the first transistor (T1), whose source (S) is connected to the first switching module (50), and whose drain (D) receives the driving voltage (Vdd); a capacitor (C1) having one end connected to the drain of the first transistor (T1) and the gate (G) of the second transistor (T2), and another end connected to the source (S) of the second transistor (T2) and the switching module; 3. The voltage regulation circuit of claim 2, comprising:

4. The comparison module (30) a voltage comparator (U1) having a non-inverting input terminal receiving the drive voltage (Vdd), an inverting input terminal receiving the reference voltage (Vref), and an output terminal connected to the selection module (40); 4. The voltage regulation circuit of claim 3, comprising:

5. The comparison module (30) a voltage comparator (U1) having an inverting input terminal receiving the drive voltage (Vdd), a non-inverting input terminal receiving the reference voltage (Vref), and an output terminal connected to the selection module (40); 4. The voltage regulation circuit of claim 3, comprising:

6. The selection module (40) a third transistor (T3) having a gate connected to the output terminal of the voltage comparator (U1), a source to which the reverse low voltage (VGL) is input, and a drain connected to the first switching module (50) and the second switching module (60); a fourth transistor (T4) having a gate connected to the output terminal of the voltage comparator (U1), a source to which the forward high voltage (VGH) is input, and a drain connected to the first switching module (50) and the second switching module (60); 5. The voltage regulation circuit of claim 4, comprising:

7. The gate of the third transistor (T3) and the gate of the fourth transistor (T4) together constitute an input terminal of the selection module (40), and the drain of the third transistor (T3) and the drain of the fourth transistor (T4) together constitute an output terminal of the selection module (40).

7. A voltage stabilization circuit according to claim 6.

8. The first switching module (50) comprises: a fifth transistor (T5) having a gate connected to the drain of the third transistor (T3) and the drain of the fourth transistor (T4), a source connected to the source (S) of the second transistor (T2) and the other end of the capacitor (C1), and a drain connected to an anode terminal of the light-emitting element (MICRO LED); 7. The voltage regulation circuit of claim 6, comprising:

9. The second switching module (60) comprises: A sixth transistor (T6) having a gate connected to the drain of the third transistor (T3), the drain of the fourth transistor (T4), and the gate of the fifth transistor (T5), a source to which the data voltage (Vdata) is input, and a drain connected to the source of the first transistor (T1); 9. The voltage regulation circuit of claim 8, comprising:

10. When the scanning signal (Scan) is at a high level, the first transistor (T1) is turned on, and when the driving voltage (Vdd) is smaller than the reference voltage (Vref), the voltage comparator (U1) outputs a low level, the third transistor (T3) is turned on, the fourth transistor (T4) is turned off, the selection module (40) outputs a reverse low voltage (VGL), the fifth transistor (T5) is turned off, the sixth transistor (T6) is turned off, the second transistor (T2) is turned off, and the light emitting element (MICRO LED) is turned off and does not emit light.

10. The voltage stabilization circuit according to claim 9.

11. When the scanning signal (Scan) is at a high level, the first transistor (T1) is turned on, and when the driving voltage (Vdd) is greater than the reference voltage (Vref), the voltage comparator (U1) outputs a high level, the third transistor (T3) is turned off, the fourth transistor (T4) is turned on, the selection module (40) outputs a forward high voltage (VGH), the fifth transistor (T5) is turned on, the sixth transistor (T6) is turned on, the second transistor (T2) is turned on, and the light emitting element (MICRO LED) is turned on to emit light. The voltage stabilization circuit according to claim 10.

12. A display panel including a voltage stabilizing circuit, The voltage stabilizing circuit includes: A light emitting module (10); a driving module (20) to which a scanning signal (Scan) and a driving voltage (Vdd) are input, and which is used to supply the driving voltage (Vdd) to the light emitting module (10) under control of the scanning signal (Scan); a comparison module (30) connected to the driving module (20), receiving the driving voltage (Vdd) and a reference voltage (Vref), and used to compare the magnitude of the driving voltage (Vdd) and the reference voltage (Vref) to generate an output signal; a selection module (40) connected to the comparison module (30), receiving a forward high voltage (VGH) and a reverse low voltage (VGL), and used to output the forward high voltage (VGH) or the reverse low voltage (VGL) under the control of the output signal; a first switching module (50) connected to the light emitting module (10), the driving module (20) and the selection module (40), for turning on a circuit connection between the driving module (20) and the light emitting module (10) by controlling the forward high voltage (VGH) or turning off a circuit connection between the driving module (20) and the light emitting module (10) by controlling the reverse low voltage (VGL); a second switching module (60) connected to the driving module (20), the first switching module (50) and the selection module (40), receiving a data voltage (Vdata) and used to output the data voltage (Vdata) to the driving module (20) by controlling the forward high voltage (VGH) or to prevent the data voltage (Vdata) from entering the driving module (20) by controlling the reverse low voltage (VGL); When the scanning signal (Scan) is at a high level and the driving voltage (Vdd) is smaller than the reference voltage (Vref), the comparison module (30) outputs a low level, the selection module (40) outputs the reverse low voltage (VGL), the first switching module (50) is turned off, the second switching module (60) is turned off, and the light emitting module (10) is turned off and does not emit light; When the scanning signal (Scan) is at a high level and the driving voltage (Vdd) is greater than the reference voltage (Vref), the comparison module (30) outputs a high level, the selection module (40) outputs the forward high voltage (VGH), the first switching module (50) is turned on, the second switching module (60) is turned on, and the light emitting module (10) is turned on to emit light. Display panel.

13. A processor, a communication bus, a user interface, a network interface, and a memory. The display panel of claim 12 further comprising:

Images