Display module and control method thereof, and display device

Abstract

A display module (100, 200) comprises a display panel (1), a power drive module (2), a voltage signal line (3), a sampling resistor (4) and a detection control module (5). The voltage signal line (3) is connected between the display panel (1) and the power drive module (2), and the sampling resistor (4) is connected in series to the voltage signal line (3). The detection control module (5) is connected to opposite ends of the sampling resistor (4), and the detection control module (5) is also connected to the power drive module (2). The detection control module (5) is configured to: detect the voltage on the sampling resistor (4) or the current flowing through the sampling resistor (4); if it is determined that the voltage is greater than or equal to a voltage threshold, control the driving voltage generated by the power drive module (2) to be reduced to a preset value lower than the voltage threshold; or, if it is determined that the current is greater than or equal to the current threshold, control the driving voltage generated by the power drive module (2) to be reduced to a preset value lower than the voltage threshold.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display module and a control method thereof, and a display device. Background Art

[0002] AMOLED (Active-matrix organic light emitting diode) display screen is a current-driven display screen, which has the advantages of low driving voltage, long service life of light-emitting elements, low power consumption, fast response speed, and low leakage. Therefore, AMOLED display screens are usually used in large-size OLED panel products. Summary of the invention

[0003] On the one hand, a display module is provided, the display module includes a display panel, a power drive module, a voltage signal line, a sampling resistor and a detection control module. The power drive module is configured to generate a driving voltage. The voltage signal line is connected between the display panel and the power drive module, and the voltage signal line is configured to transmit the driving voltage generated by the power drive module to the display panel, so that the display panel emits light. The sampling resistor is connected in series to the voltage signal line. The detection control module is connected to the opposite ends of the sampling resistor, and the detection control module is configured to detect the voltage on the sampling resistor or the current flowing through the sampling resistor. The detection control module is also connected to the power drive module, and the detection control module is also configured to: if it is judged that the voltage is greater than or equal to the voltage threshold, then control the driving voltage generated by the power drive module to be reduced to a preset value lower than the voltage threshold; or, if it is judged that the current is greater than or equal to the current threshold, then control the driving voltage generated by the power drive module to be reduced to a preset value lower than the voltage threshold.

[0004] In some embodiments, the display module further includes a chip-on-film circuit board. The chip-on-film circuit board includes a substrate and a first connection electrode and a second connection electrode located on the substrate. The first connection electrode is connected to the display panel. The voltage signal line includes a first conductive portion located on the substrate and connected between the first connection electrode and the second connection electrode; and a second conductive portion connected between the second connection electrode and the power drive module. The sampling resistor is located in the second conductive portion.

[0005] In some embodiments, the display module further includes a main control circuit board, the main control circuit board is connected to the second connection electrode, and the second conductive part, the sampling resistor, the power drive module and the detection control module are all located on the main control circuit board. Alternatively, the display module further includes a main control circuit board and a flexible circuit board, the flexible circuit board is connected between the main control circuit board and the second connection electrode, the second conductive part and the sampling resistor are located on the flexible circuit board, and the power drive module and the detection control module are located on the main control circuit board.

[0006] In some embodiments, the detection control module includes a subtractor module, a comparator module and a logic control module. The subtractor module is connected to the opposite ends of the sampling resistor, and the subtractor module is configured to: obtain the potential at both ends of the sampling resistor; according to the potential at both ends of the sampling resistor, calculate the difference between the potentials at both ends of the sampling resistor, and the difference is the voltage on the sampling resistor. The comparator module is connected to the subtractor, and the comparator module is configured to: obtain the voltage on the sampling resistor calculated by the subtractor module, compare the voltage on the sampling resistor with the voltage threshold, and obtain a comparison result. The logic control module is connected to the comparator module, and the logic control module is configured to: obtain the comparison result of the comparator module, and if the comparison result is that the voltage is greater than or equal to the voltage threshold, then control the driving voltage generated by the power drive module to be reduced to a preset value lower than the voltage threshold.

[0007] In some embodiments, the detection control module includes a subtractor module and a logic control module. The subtractor module is connected to the opposite ends of the sampling resistor, and the subtractor module is configured to: obtain the potentials at the two ends of the sampling resistor; calculate the difference between the potentials at the two ends of the sampling resistor according to the potentials at the two ends of the sampling resistor, and the difference is the voltage on the sampling resistor. The logic control module is connected to the subtractor module and the power drive module respectively, and the logic control module is configured to: obtain the voltage on the sampling resistor calculated by the subtractor module, compare the voltage on the sampling resistor with the voltage threshold, and obtain a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, then control the driving voltage generated by the power drive module to be reduced to a preset value lower than the voltage threshold. Alternatively, the logic control module is configured to: obtain the resistance value of the sampling resistor and the voltage on the sampling resistor calculated by the subtractor module, and calculate the current flowing through the sampling resistor according to the resistance value of the sampling resistor and the voltage on the sampling resistor; compare the current flowing through the sampling resistor with a current threshold to obtain a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, control the driving voltage generated by the power driving module to be reduced to a preset value lower than the voltage threshold.

[0008] In some embodiments, the detection control module includes a logic control module, the logic control module is connected to the opposite ends of the sampling resistor, and the logic control module is configured to: obtain the potential at both ends of the sampling resistor; calculate the difference between the potentials at both ends of the sampling resistor according to the potential at both ends of the sampling resistor, and the difference is the voltage on the sampling resistor. The logic control module is also configured to: compare the voltage on the sampling resistor with the voltage threshold to obtain a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, then control the driving voltage generated by the power drive module to be reduced to a preset value lower than the voltage threshold. Alternatively, the logic control module is configured to: obtain the resistance of the sampling resistor, calculate the current flowing through the sampling resistor according to the resistance of the sampling resistor and the voltage on the sampling resistor; compare the current flowing through the sampling resistor with the current threshold to obtain a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, then control the driving voltage generated by the power drive module to be reduced to a preset value lower than the voltage threshold.

[0009] In some embodiments, the display module also includes an analog-to-digital conversion module, which is connected between the logic control module and the sampling resistor. The analog-to-digital conversion module is configured to: obtain the potential across the sampling resistor, convert the potential across the sampling resistor from an analog potential signal to a digital potential signal, and output it to the logic control module respectively.

[0010] In some embodiments, the preset value is equal to 0V.

[0011] In some embodiments, the resistance of the sampling resistor ranges from 1 mΩ to 2 mΩ.

[0012] In some embodiments, the display module further includes a polarizer disposed on a display side of the display panel.

[0013] On the other hand, another display module is provided, the display module includes a display panel, a power drive module, a voltage signal line, a sampling resistor and a detection output module. The power drive module is configured to generate a driving voltage. The voltage signal line is connected between the display panel and the power drive module, and the voltage signal line is configured to transmit the driving voltage generated by the power drive module to the display panel, so that the display panel emits light. The sampling resistor is connected in series to the voltage signal line. The detection output module is connected to the opposite ends of the sampling resistor, and the detection output module is configured to detect and output the voltage on the sampling resistor or the current flowing through the sampling resistor.

[0014] In some embodiments, the detection output module includes a subtractor module and an analog-to-digital conversion module. The subtractor module is connected to opposite ends of the sampling resistor, and the subtractor module is configured to obtain the potentials at both ends of the sampling resistor, and calculate the difference between the potentials at both ends of the sampling resistor according to the potentials at both ends of the sampling resistor, and the difference is the voltage on the sampling resistor. The analog-to-digital conversion module is connected to the subtractor module, and the analog-to-digital conversion module is configured to convert the calculated voltage on the sampling resistor from an analog voltage signal to a digital voltage signal, and output the digital voltage signal.

[0015] On the other hand, a display device is provided, comprising the display module as described in any of the above embodiments.

[0016] On the other hand, a driving method of a display module is provided, wherein the display module includes: a display panel, a power driving module, a voltage signal line, a sampling resistor and a detection control module. The voltage signal line is connected between the display panel and the power driving module, the sampling resistor is connected in series to the voltage signal line, the detection control module is connected to the opposite ends of the sampling resistor, and the detection control module is also connected to the power driving module. The driving method includes: the detection control module detects the voltage on the sampling resistor or the current flowing through the sampling resistor. If the detection control module determines that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold; or, if the detection control module determines that the current is greater than or equal to the current threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold.

[0017] In some embodiments, the detection control module includes: a subtractor module, a comparator module and a logic control module. The subtractor module is connected to the opposite ends of the sampling resistor, the comparator module is connected to the subtractor module, the logic control module is connected to the comparator module, and the logic control module is also connected to the power drive module. The driving method includes: the subtractor module obtains the potential at both ends of the sampling resistor; according to the potential at both ends of the sampling resistor, the difference between the potentials at both ends of the sampling resistor is calculated, and the difference is the voltage on the sampling resistor. The comparator module obtains the voltage on the sampling resistor calculated by the subtractor module, compares the voltage on the sampling resistor with the voltage threshold, and obtains a comparison result. The logic control module obtains the comparison result of the comparator module, and if the comparison result is that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the power drive module is controlled to be reduced to a preset value lower than the voltage threshold.

[0018] In some embodiments, the detection control module includes a subtractor module and a logic control module, the subtractor module is connected to opposite ends of the sampling resistor, the logic control module is connected to the subtractor module, and the logic control module is also connected to the power drive module. The driving method includes: the subtractor module obtains the potential at both ends of the sampling resistor; according to the potential at both ends of the sampling resistor, the difference between the potentials at both ends of the sampling resistor is calculated, and the difference is the voltage on the sampling resistor. The logic control module obtains the voltage on the sampling resistor calculated by the subtractor module, compares the voltage on the sampling resistor with a voltage threshold, and obtains a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold; or, the logic control module obtains the resistance value of the sampling resistor and the voltage on the sampling resistor calculated by the subtractor module, calculates the current flowing through the sampling resistor according to the resistance value of the sampling resistor and the voltage on the sampling resistor; compares the current flowing through the sampling resistor with a current threshold, and obtains a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold.

[0019] In some embodiments, the detection control module includes a logic control module, the logic control module is connected to the opposite ends of the sampling resistor, and the logic control module is also connected to the power drive module. The driving method includes: the logic control module obtains the potentials at both ends of the sampling resistor, calculates the difference between the potentials at both ends of the sampling resistor, and the difference is the voltage on the sampling resistor. The logic control module compares the voltage on the sampling resistor with the voltage threshold to obtain a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the power drive module is controlled to be reduced to a preset value lower than the voltage threshold; or, the logic control module obtains the resistance of the sampling resistor, calculates the current flowing through the sampling resistor according to the resistance of the sampling resistor and the voltage on the sampling resistor; compares the current flowing through the sampling resistor with the current threshold to obtain a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, the driving voltage generated by the power drive module is controlled to be reduced to a preset value lower than the voltage threshold.

[0020] In some embodiments, the display module further includes an analog-to-digital conversion module, and the analog-to-digital conversion module is connected between the logic control module and the sampling resistor. Before the logic control module obtains the potential at both ends of the sampling resistor, the driving method further includes: the analog-to-digital conversion module obtains the potential at both ends of the sampling resistor, converts the potential at both ends of the sampling resistor from an analog potential signal to a digital potential signal, and outputs the converted potential to the logic control module.

[0021] In another aspect, a method for driving a display module is provided, wherein the display module comprises: a display panel, a power driving module, a voltage signal line, a sampling resistor, and a detection output module. The voltage signal line is connected between the display panel and the power driving module, the sampling resistor is connected in series to the voltage signal line, and the detection control module is connected to opposite ends of the sampling resistor. The driving method comprises: the detection output module detects and outputs the voltage on the sampling resistor or the current flowing through the sampling resistor.

[0022] In some embodiments, the detection output module includes: a subtractor module and an analog-to-digital conversion module, the subtractor module is connected to the opposite ends of the sampling resistor, and the analog-to-digital conversion module is connected to the subtractor module. The driving method includes: the subtractor module obtains the potential at both ends of the sampling resistor; according to the potential at both ends of the sampling resistor, the difference between the potentials at both ends of the sampling resistor is calculated, and the difference is the voltage on the sampling resistor. The analog-to-digital conversion module converts the voltage on the sampling resistor calculated by the subtractor module from an analog voltage signal to a digital voltage signal, and outputs the digital voltage signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

[0024] Figure 1 is a structural diagram of a display module according to some embodiments;

[0025] Figure 2 is a structural diagram of a display panel according to some embodiments;

[0026] Figure 3 is a structural diagram of another display module according to some embodiments;

[0027] Figure 4 is a structural diagram of a chip-on-film circuit board according to some embodiments;

[0028] Figure 5 is a structural diagram of yet another display module according to some embodiments;

[0029] Figure 6 is a structural diagram of another display module according to some embodiments;

[0030] Figure 7 is a structural diagram of another display module according to some embodiments;

[0031] Figure 8 is a structural diagram of another display module according to some embodiments;

[0032] Fig. 9 is a structural diagram of another display module according to some embodiments;

[0033] Fig.10 is a structural diagram of another display module according to some embodiments;

[0034] Fig.11 is a structural diagram of another display module according to some embodiments;

[0035] Fig.12 is a structural diagram of another display module according to some embodiments;

[0036] Fig.13 is a structural diagram of a display device according to some embodiments;

[0037] Fig.14 is a flow chart of a method for driving a display module according to some embodiments;

[0038] Fig.15 is a flow chart of another method for driving a display module according to some embodiments;

[0039] Fig.16 is a flowchart of a driving method of a display module according to some embodiments;

[0040] Fig.17 is a flowchart of another method for driving a display module according to some embodiments;

[0041] Fig.18 is a flowchart of another method for driving a display module according to some embodiments;

[0042] Fig.19 is a flowchart of another method for driving a display module according to some embodiments;

[0043] Fig. 20 is a flowchart of another method for driving a display module according to some embodiments. DETAILED DESCRIPTION

[0044] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0045] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0046] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0047] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0048] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0049] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0050] As used herein, the term "if" is optionally interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that" or "if [a stated condition or event] is detected" are optionally interpreted to mean "upon determining that" or "in response to determining that" or "upon detecting [a stated condition or event]" or "in response to detecting [a stated condition or event]," depending on the context.

[0051] The use of "adapted to" or "configured to" herein is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0052] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0053] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0054] The display panel of the AMOLED display requires a large current during operation. The higher the brightness of the display panel, the greater the current it needs to pass. When the display panel is displaying some special images (such as game images with complex content, etc.), the current passing through is too large, which often causes the display panel to generate a lot of heat during operation, which can easily cause the display panel to be damaged and unable to display normally.

[0055] Based on this, some embodiments of the present disclosure provide a display module 100, see Figure 1 The display module 100 includes: a display panel 1, a power driving module 2, a voltage signal line 3, a sampling resistor 4 and a detection control module 5.

[0056] The display panel 1 may include a substrate and a plurality of sub-pixels arranged in an array on the substrate, each sub-pixel includes a light-emitting device and a driving circuit arranged on the substrate, and the driving circuit includes a plurality of thin film transistors. The light-emitting device includes an anode, a light-emitting functional layer, and a cathode, and the anode is electrically connected to a drain of a thin film transistor serving as a driving transistor among the plurality of thin film transistors.

[0057] On this basis, in some examples, the voltage signal line 3 is an ELVDD line, in which case the voltage signal line 3 can be electrically connected to the source of the thin film transistor used as the driving transistor among the plurality of thin film transistors. In other examples, the voltage signal line 3 is an ELVSS line, in which case the voltage signal line 3 can be electrically connected to the cathode of the light emitting device.

[0058] The power driving module 2 is configured to generate a driving voltage. The power driving module 2 is connected to the display panel 1 through the voltage signal line 3, and transmits the driving voltage to the display panel 1 through the voltage signal line 3, so that the display panel 1 emits light.

[0059] The sampling resistor 4 is connected in series to the voltage signal line 3 . The detection control module 5 is connected to two opposite ends of the sampling resistor 4 , and the detection control module 5 is configured to detect the voltage on the sampling resistor 4 or the current flowing through the sampling resistor 4 .

[0060] The detection control module 5 is also connected to the power drive module 2, and the detection control module 5 is also configured as follows: if it is judged that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the power drive module 2 is controlled to be reduced to a preset value lower than the voltage threshold; or, if it is judged that the current is greater than or equal to the current threshold, the driving voltage generated by the power drive module 2 is controlled to be reduced to a preset value lower than the voltage threshold.

[0061] With this arrangement, the current change on the voltage signal line 3 can be obtained in real time, and when the voltage on the sampling resistor 3 exceeds the voltage threshold or the current flowing through the sampling resistor 3 exceeds the current threshold, the driving voltage can be controlled in time to reduce the current on the voltage signal line 3, thereby preventing the display panel 1 from being damaged due to excessive current in the voltage signal line 3, and preventing the display panel 1 from being unable to display normally.

[0062] The preset value may be, for example, 0V, at which point the display panel 1 will output a black screen, thereby providing stable and effective protection for the display panel 1 .

[0063] In some embodiments, see Figure 2 The display module 100 further includes a polarizer 11, which is disposed on the display side of the display panel 1. The polarizer 11 can prevent interference from external light during the light emission process of the display panel 1, thereby ensuring normal display of the display panel 1.

[0064] It should be noted that when the polarizer 11 is provided, if the current input from the voltage signal line 3 to the display panel 1 is too large, the display panel 1 is seriously heated, and it is easy to exceed the tolerance limit of the polarizer 11. At this time, the polarizer 11 is easy to turn yellow, resulting in the display panel 1 not being able to display normally. The display module 100 provided in some of the above embodiments can obtain the current change on the voltage signal line 3 in real time, and when the voltage on the sampling resistor 3 exceeds the voltage threshold or the current flowing through the sampling resistor 3 exceeds the current threshold, the driving voltage is timely controlled to reduce the current on the voltage signal line 3, thereby effectively preventing the problem of the display panel 1 not being able to display normally due to the yellowing of the polarizer 11.

[0065] In some embodiments, Figure 3 and Figure 4 As shown, the display module 100 further includes a COF circuit board 6 , and the COF circuit board 6 includes a substrate 60 and a first connection electrode 61 and a second connection electrode 62 located on the substrate 60 .

[0066] The first connection electrode 61 is connected to the display panel 1. The voltage signal line 3 includes a first conductive portion 31 located on the substrate 21 and connected between the second connection electrode 61 and the second connection electrode 62; and a second conductive portion 32 connected between the second connection electrode 62 and the power driving module 5. The sampling resistor 4 is located in the second conductive portion 32.

[0067] It is worth pointing out that the greater the current on the voltage signal line 3, the more serious the heat generated by the first conductive part 31 on the substrate 60. The heat resistance of the chip-on-film circuit board 6 is poor. When the heat generated by the first conductive part 31 exceeds the tolerance limit of the chip-on-film circuit board 6, the chip-on-film circuit board 6 is easily burned. At the same time, since the chip-on-film circuit board 6 is bound to the display panel 1 through the first connecting electrode 61, the position of the above-mentioned polarizer 11 close to the chip-on-film circuit board 6 is prone to severe yellowing.

[0068] In some of the above embodiments, by setting the sampling resistor 4 on the second conductive part 32, the current change on the voltage signal line 3 can be detected in time. For example, when the voltage on the sampling resistor 3 exceeds the voltage threshold or the current flowing through the sampling resistor 3 exceeds the current threshold, the driving voltage is controlled in time to reduce the current on the voltage signal line 3, thereby effectively preventing the display panel 1 from failing to display normally due to reasons such as the burning of the chip-on-film circuit board 6 and the yellowing of the polarizer 11.

[0069] The substrate 60 may be made of a flexible PI (polyimide) film material.

[0070] For example, see Figure 3 and Figure 4 A chip 63 (such as a display driver chip and / or a touch control chip) can also be installed on the COF 6, and the chip 63 can be packaged on the substrate 60 through a grain soft film. At this time, by bending the COF 6, the chip 63 can be moved to the back side of the display panel 1. Therefore, after the display module 100 is applied to the display device, it is more conducive to realizing a narrow frame design.

[0071] In some embodiments, see Figure 5 The display module 100 further includes a main control circuit board 7, which is connected to the second connection electrode 62. For example, a plug connector may be provided on the main control circuit board 7, and the second connection electrode 23 of the chip-on-film circuit board 6 may be plugged into the plug connector of the main control circuit board 7.

[0072] On this basis, the second conductive part 32, the sampling resistor 4, the power drive module 2 and the detection control module 5 are all located on the main control circuit board 7. With this design, the second conductive part 32, the sampling resistor 4, the power drive module 2 and the detection control module 5 can be integrated into the main control circuit board 7, thereby improving the integration of the display module 100. When the display module 100 shakes, the second conductive part 32, the sampling resistor 4, the power drive module 2 and the detection control module 5 are not likely to shake, and thus are not likely to fail.

[0073] In other embodiments, see Figure 6 The display module 100 further includes a main control circuit board 7 and a flexible circuit board 8. The flexible circuit board 8 is connected between the main control circuit board 7 and the second connection electrode 62 of the chip-on-film circuit board 6. The second conductive portion 32 and the sampling resistor 4 are located on the flexible circuit board 8. The power drive module 2 and the detection control module 5 are located on the main control circuit board 7. The arrangement of the flexible circuit board 8 can facilitate the line layout of the voltage signal line 3 in the display module 100 and reduce the burden of the main control circuit board 7.

[0074] In some embodiments, see Figure 7 The detection control module 5 includes: a subtractor module 51, a comparator module 52 and a logic control module 53. The subtractor module 51 is connected to the opposite ends of the sampling resistor 4, the comparator module 52 is connected to the subtractor module 51, the logic control module 53 is connected to the comparator module 52, and the logic control module 53 is also connected to the power drive module 2.

[0075] The subtractor module 51 is configured to: obtain the potentials at both ends of the sampling resistor 4 ; and calculate the difference between the potentials at both ends of the sampling resistor 4 according to the potentials at both ends of the sampling resistor 4 , where the difference is the voltage on the sampling resistor 4 .

[0076] The comparator module 52 is configured to obtain the voltage on the sampling resistor 4 calculated by the subtractor module 51 , and compare the voltage on the sampling resistor 4 with a voltage threshold to obtain a comparison result.

[0077] The logic control module 53 is configured to: if the comparison result is that the voltage is greater than or equal to the voltage threshold, then control the driving voltage generated by the power driving module 2 to decrease to a preset value lower than the voltage threshold.

[0078] When the preset value is 0V, the display panel 1 outputs a black screen; when the preset value is in a safe operating range between 0V and the voltage threshold, the display panel 1 outputs a lower brightness screen, thereby preventing the display panel 1 from being damaged and unable to display normally.

[0079] In this way, the voltage detection function, the voltage comparison function with the voltage threshold, and the function of responding and controlling the power drive module 2 after the comparison are respectively implemented by different hardware, that is, the above functions are implemented by the cooperation between the subtractor module 51, the comparator module 52 and the logic control module 53. In this way, when the voltage of the sampling resistor 4 exceeds the threshold voltage, it can respond quickly, for example, control the driving voltage generated by the power drive module 2 to decrease to a preset value, so as to protect the display panel 1 in a timely and effective manner.

[0080] In some embodiments, see Figure 8 The detection control module 5 includes a subtractor module 51 and a logic control module 53 . The subtractor module 51 is connected to two opposite ends of the sampling resistor 4 , and the subtractor module 51 is also connected to the logic control module 53 .

[0081] The subtractor module 51 is configured to obtain the potentials at both ends of the sampling resistor 4 and calculate the difference between the potentials at both ends of the sampling resistor 4 , where the difference is the voltage on the sampling resistor 4 .

[0082] The logic control module 53 is configured to: compare the voltage on the sampling resistor 4 with the voltage threshold to obtain a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, then control the driving voltage generated by the power driving module 2 to be reduced to a preset value lower than the voltage threshold;

[0083] Alternatively, the logic control module 53 is configured to: obtain the resistance value of the sampling resistor 4, calculate the current flowing through the sampling resistor 4 according to the resistance value of the sampling resistor 4 and the voltage on the sampling resistor 4; compare the current flowing through the sampling resistor 4 with the current threshold to obtain a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, then control the driving voltage generated by the power supply driving module 2 to be reduced to a preset value lower than the voltage threshold. The current flowing through the sampling resistor 4 is the ratio between the voltage on the sampling resistor 4 obtained by the subtractor module 51 and the resistance value of the sampling resistor 4.

[0084] With this arrangement, the comparison function between voltage and voltage threshold, or the conversion of voltage into current, and the comparison function between current and current threshold can be integrated into the logic control module 53 without the need to separately set up the comparator module 52, which is conducive to simplifying the overall structure of the display module 100.

[0085] In some embodiments, see Fig. 9 The detection control module 5 includes a logic control module 53 , and the logic control module 53 is connected to two opposite ends of the sampling resistor 4 .

[0086] The logic control module 53 is configured to: obtain the potentials at both ends of the sampling resistor 4 , and calculate the difference between the potentials at both ends of the sampling resistor 4 , where the difference is the voltage on the sampling resistor 4 .

[0087] The logic control module 53 is further configured to: compare the voltage on the sampling resistor 4 with the voltage threshold to obtain a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, then control the driving voltage generated by the power driving module 2 to be reduced to a preset value lower than the voltage threshold;

[0088] Alternatively, the resistance value of the sampling resistor 4 is obtained, and the current flowing through the sampling resistor 4 is calculated based on the resistance value of the sampling resistor 4 and the voltage on the sampling resistor 4; the current flowing through the sampling resistor 4 is compared with the current threshold to obtain a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, the driving voltage generated by the control power drive module 2 is reduced to a preset value lower than the voltage threshold.

[0089] With such a configuration, the voltage (or current) detection function, the voltage and voltage threshold comparison function (or the current and current threshold comparison function), and the function of responding and controlling the power drive module 2 after comparison can be integrated into the logic control module 53. For example, there is no need to set up the subtractor module 51 and the comparator module 52, which is conducive to further simplifying the overall structure of the display module 100.

[0090] In some embodiments, see Fig.10 The display module further includes an analog-to-digital conversion module 54, which is connected between the logic control module 53 and the sampling resistor 4. The analog-to-digital conversion module 54 is configured to convert the potential at both ends of the sampling resistor 4 from an analog potential signal to a digital potential signal, and then output it to the logic control module 53.

[0091] In this solution, the analog-to-digital conversion module 54 can be used to directly convert the analog potential signal across the sampling resistor 4 measured in real time into a digital potential signal. This helps the subsequent logic control module 53 to calculate the voltage on the sampling resistor 4 or the current flowing through the sampling resistor 4 more quickly, thereby helping to speed up the feedback control of the power drive module 2 and improve safety.

[0092] Some embodiments of the present disclosure also provide another display module 200, see Fig.11 The display module 200 includes a display panel 1, a power driving module 2, a voltage signal line 3, a sampling resistor 4 and a detection output module 9. The voltage signal line 3 is connected between the display panel 1 and the power driving module 2, the sampling resistor 4 is connected in series to the voltage signal line 3, and the detection output module 9 is connected to opposite ends of the sampling resistor 4.

[0093] The detection output module 9 is configured to detect and output the voltage on the sampling resistor 3 or the current flowing through the sampling resistor 3 .

[0094] With this arrangement, the current change in the voltage signal line 3 can be monitored. When the current in the voltage signal line 3 is too large and causes damage to the display panel 1, the voltage on the sampling resistor 3 or the current flowing through the sampling resistor 3 can be output at this time, and the voltage on the sampling resistor 3 or the current flowing through the sampling resistor 3 at this time can be used as an important reference for setting the above-mentioned voltage threshold and current threshold. For example, the output value can be directly used as the voltage threshold or current threshold. For another example, a value slightly lower than the output value can be used as the voltage threshold or current threshold.

[0095] In some embodiments, see Fig.12 The detection output module 9 includes a subtractor module 51 and an analog-to-digital conversion module 54. The subtractor module 51 is connected to two opposite ends of the sampling resistor 3, and the analog-to-digital conversion module 54 is connected to the subtractor module 51.

[0096] The subtractor module 51 is configured to obtain the potentials at both ends of the sampling resistor 4 , and calculate the difference between the potentials at both ends of the sampling resistor 4 according to the potentials at both ends of the sampling resistor 4 , where the difference is the voltage on the sampling resistor 4 .

[0097] The analog-to-digital conversion module 54 is connected to the subtractor module 51 , and the analog-to-digital conversion module 54 is configured to: convert the calculated voltage on the sampling resistor 4 from an analog voltage signal into a digital voltage signal, and output the digital voltage signal.

[0098] In this way, the digital voltage signal can facilitate the tester to read the real-time voltage across the sampling resistor 4, and is also conducive to setting the specific values ​​of the voltage threshold and the current threshold. In the setting process, for example, the following setting method can be used:

[0099] By using the above-mentioned display module 200, the driving voltage is gradually increased to increase the current in the voltage signal line 3. When the tester observes that the polarizer 11 on the display panel 1 shows signs of yellowing or the display panel 1 displays abnormally (partial black screen or full black screen), the maximum value of the voltage data output by the analog-to-digital conversion module 54 is selected, and the maximum value can be set as the voltage threshold; and the current threshold is the ratio between the voltage threshold and the resistance value of the sampling resistor 4.

[0100] It should be noted that the voltage threshold can also be set to a value slightly smaller than the above-mentioned maximum value (for example, a value not less than 0.8 times the maximum value). This can more safely protect the display panel 1 and prevent the voltage signal line 3 from having a current close to or equal to the current threshold during the operation of the display panel 1, which directly causes the display panel 1 to fail to display normally.

[0101] The present disclosure does not limit the specific resistance value of the sampling resistor 4, which can be connected in series to the voltage signal line 3 as long as it does not affect the normal display of the display panel 1. It should be noted that the resistance of the sampling resistor 4 should be as small as possible to reduce its influence on the current change in the voltage signal line 3.

[0102] Exemplarily, the resistance value of the sampling resistor ranges from 1 mΩ to 2 mΩ, and the resistance value of the sampling resistor may be, for example, 1 mΩ, 1.1 mΩ, 1.5 mΩ, 1.8 mΩ, 2 mΩ, etc.

[0103] Some embodiments of the present disclosure provide a display device 300, such as Fig.13 As shown, the display device 300 includes the display module 100 of any of the above embodiments or the display module 200 of any of the above embodiments.

[0104] Since the display device 300 includes the display module 100 of some of the above embodiments or the display module 200 of any of the above embodiments, the display device 300 has all the same beneficial effects as the display module 100 or the display module 200, which will not be described again.

[0105] The display device 300 may be, for example, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, or any other product or component with a display function.

[0106] The present disclosure also provides a method for driving a display module. Figure 1 The display module 100 includes a display panel 1, a power drive module 2, a voltage signal line 3, a sampling resistor 4 and a detection control module 5. On this basis, see Fig.14 , the driving method includes S101 and S102.

[0107] S101 : the detection control module 5 detects and obtains the voltage on the sampling resistor 4 or the current flowing through the sampling resistor 4 .

[0108] S102: If the detection control module 5 determines that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the control power driving module 2 is reduced to a preset value lower than the voltage threshold; or, if the detection control module 5 determines that the current is greater than or equal to the current threshold, the driving voltage generated by the control power driving module 2 is reduced to a preset value lower than the voltage threshold.

[0109] With such arrangement, the current change on the voltage signal line 3 is acquired in real time by detecting the control module 5, and when the voltage on the sampling resistor 3 exceeds the voltage threshold or the current flowing through the sampling resistor 3 exceeds the current threshold, the driving voltage is promptly controlled to reduce the current on the voltage signal line 3, thereby preventing the display panel 1 from being damaged due to excessive current in the voltage signal line 3, and preventing the display panel 1 from being unable to display normally.

[0110] For example, see Figure 7 , the detection control module 5 includes a subtractor module 51, a comparator module 52 and a logic control module 53. On this basis, see Fig.15 , the driving method includes S201~S203.

[0111] S201 : the subtractor module 51 obtains the potentials at both ends of the sampling resistor 4 ; and calculates the difference between the potentials at both ends of the sampling resistor 4 according to the potentials at both ends of the sampling resistor 4 , where the difference is the voltage on the sampling resistor 4 .

[0112] S202: the comparator module 52 obtains the voltage on the sampling resistor 4 calculated by the subtractor module 51, and compares the voltage on the sampling resistor 4 with the voltage threshold to obtain a comparison result.

[0113] S203: the logic control module 53 obtains the comparison result of the comparator module 52. If the comparison result is that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the control power driving module 2 is reduced to a preset value lower than the voltage threshold.

[0114] In this way, the voltage detection function, the voltage comparison function with the voltage threshold, and the function of responding and controlling the power drive module 2 after the comparison are respectively implemented by different hardware, that is, the above functions are implemented by the cooperation between the subtractor module 51, the comparator module 52 and the logic control module 53. In this way, when the voltage of the sampling resistor 4 exceeds the threshold voltage, it can respond quickly, for example, control the driving voltage generated by the power drive module 2 to decrease to a preset value, so as to protect the display panel 1 in a timely and effective manner.

[0115] For example, see Figure 8 , the detection control module 5 includes a subtractor module 51 and a logic control module 53. On this basis, see Fig.16 , the driving method includes S301 and S302.

[0116] S301 : the subtractor module 51 obtains the potentials at both ends of the sampling resistor 4 ; and calculates the difference between the potentials at both ends of the sampling resistor 4 according to the potentials at both ends of the sampling resistor 4 , where the difference is the voltage on the sampling resistor 4 .

[0117] S302: The logic control module 53 obtains the voltage on the sampling resistor 4 calculated by the subtractor module 51, compares the voltage on the sampling resistor 4 with the voltage threshold, and obtains a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the control power drive module 2 is reduced to a preset value lower than the voltage threshold. Alternatively, the logic control module 53 obtains the resistance value of the sampling resistor 4 and the voltage on the sampling resistor 4 calculated by the subtractor module 51, and calculates the current flowing through the sampling resistor 4 according to the resistance value of the sampling resistor 4 and the voltage on the sampling resistor 4; compares the current flowing through the sampling resistor 4 with the current threshold, and obtains a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, the driving voltage generated by the control power drive module 2 is reduced to a preset value lower than the voltage threshold.

[0118] With this arrangement, the comparison function between voltage and voltage threshold, or the conversion of voltage into current, and the comparison function between current and current threshold can be integrated into the logic control module 53 without the need to separately set up the comparator module 52, which is conducive to simplifying the overall structure of the display module 100.

[0119] For example, see Fig. 9 , the detection control module 5 includes a logic control module 53. On this basis, see Fig.17 , the driving method includes S401 and S402.

[0120] S401 : the logic control module 53 obtains the potentials at both ends of the sampling resistor 4 ; and calculates the difference between the potentials at both ends of the sampling resistor 4 according to the potentials at both ends of the sampling resistor 4 , where the difference is the voltage on the sampling resistor 4 .

[0121] S402: The logic control module 53 compares the voltage on the sampling resistor 4 with the voltage threshold to obtain a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the control power drive module 2 is reduced to a preset value lower than the voltage threshold. Alternatively, the logic control module 53 obtains the resistance value of the sampling resistor 4, and calculates the current flowing through the sampling resistor 4 according to the resistance value of the sampling resistor 4 and the voltage on the sampling resistor 4; the current flowing through the sampling resistor 4 is compared with the current threshold to obtain a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, the driving voltage generated by the control power drive module 2 is reduced to a preset value lower than the voltage threshold.

[0122] With such a configuration, the voltage (or current) detection function, the voltage and voltage threshold comparison function (or the current and current threshold comparison function), and the function of responding and controlling the power drive module 2 after comparison can be integrated into the logic control module 53. For example, the subtractor module 51 and the comparator module 52 can be omitted, which is conducive to further simplifying the overall structure of the display module 100.

[0123] In some embodiments, see Fig.10 The display module 100 also includes an analog-to-digital conversion module 54 .

[0124] See also Fig.18 , before S401 , the driving method further includes S400 .

[0125] S400 : the analog-to-digital conversion module 54 obtains the potentials at both ends of the sampling resistor 4 , converts the potentials at both ends of the sampling resistor 4 from analog potential signals to digital potential signals, and outputs them to the logic control module 53 .

[0126] Such a configuration helps the subsequent logic control module 53 to more quickly calculate the voltage on the sampling resistor 4 or the current flowing through the sampling resistor 4 , thereby helping to speed up the feedback control of the power drive module 2 and improve safety.

[0127] Some embodiments of the present disclosure provide another method for driving a display module, wherein: Fig.11 The display module 200 includes: a display panel 1, a power driving module 2, a voltage signal line 3, a sampling resistor 4 and a detection output module 9.

[0128] See also Fig.19 , the driving method includes S501.

[0129] S501 : the detection output module 9 detects and outputs the voltage on the sampling resistor 4 or the current flowing through the sampling resistor 4 .

[0130] With this arrangement, the current change in the voltage signal line 3 can be monitored. When the current in the voltage signal line 3 is too large and causes damage to the display panel 1, the voltage on the sampling resistor 3 or the current flowing through the sampling resistor 3 can be output at this time, and the voltage on the sampling resistor 3 or the current flowing through the sampling resistor 3 at this time can be used as an important reference for setting the above-mentioned voltage threshold and current threshold. For example, the output value can be directly used as the voltage threshold or current threshold. For another example, a value slightly lower than the output value can be used as the voltage threshold or current threshold.

[0131] For example, see Fig.12 The detection output module 9 includes a subtractor module 51 and an analog-to-digital conversion module 54 .

[0132] See also Fig. 20 , S501 includes S5011 and S5012, and the driving method specifically includes:

[0133] S5011 : the subtractor module 51 obtains the potentials at both ends of the sampling resistor 4 ; and calculates the difference between the potentials at both ends of the sampling resistor 4 according to the potentials at both ends of the sampling resistor 4 , where the difference is the voltage on the sampling resistor 4 .

[0134] S5012: The analog-to-digital conversion module 54 converts the voltage on the sampling resistor 4 calculated by the subtractor module 51 from an analog voltage signal into a digital voltage signal, and outputs the digital voltage signal.

[0135] In this way, the digital voltage signal can facilitate the tester to read the real-time voltage across the sampling resistor 4, thereby facilitating the setting of the voltage threshold.

[0136] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be thought of by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A display module, comprising: Display panel; A power driver module is configured to generate a driving voltage; a voltage signal line connected between the display panel and the power driving module, wherein the voltage signal line is configured to transmit the driving voltage generated by the power driving module to the display panel to make the display panel emit light; A sampling resistor, connected in series to the voltage signal line; A detection control module is connected to two opposite ends of the sampling resistor, and the detection control module is configured to: detect and obtain a voltage on the sampling resistor or a current flowing through the sampling resistor; The detection control module is also connected to the power drive module, and the detection control module is further configured to: if it is determined that the voltage is greater than or equal to the voltage threshold, control the driving voltage generated by the power drive module to be reduced to a preset value lower than the voltage threshold; or, if it is determined that the current is greater than or equal to the current threshold, control the driving voltage generated by the power drive module to be reduced to a preset value lower than the voltage threshold; Chip-on-film circuit board, including: substrate; a first connecting electrode and a second connecting electrode located on the substrate, wherein the first connecting electrode is connected to the display panel; The voltage signal line comprises: a first conductive portion located on the substrate and connected between the first connection electrode and the second connection electrode; a second conductive portion connected between the second connection electrode and the power driving module; Wherein, the sampling resistor is located in the second conductive part.

2. The display module according to claim 1, further comprising: A main control circuit board connected to the second connection electrode, wherein the second conductive portion, the sampling resistor, the power drive module and the detection control module are all located on the main control circuit board; or, A main control circuit board and a flexible circuit board, wherein the flexible circuit board is connected between the main control circuit board and the second connecting electrode, the second conductive portion and the sampling resistor are located on the flexible circuit board, and the power drive module and the detection control module are located on the main control circuit board.

3. The display module according to claim 1 or 2, wherein: The detection control module comprises: A subtractor module is connected to opposite ends of the sampling resistor, and is configured to: obtain the potentials at both ends of the sampling resistor; and calculate the difference between the potentials at both ends of the sampling resistor according to the potentials at both ends of the sampling resistor, wherein the difference is the voltage on the sampling resistor; A comparator module is connected to the subtractor, and the comparator module is configured to: obtain the voltage on the sampling resistor calculated by the subtractor module, compare the voltage on the sampling resistor with a voltage threshold, and obtain a comparison result; A logic control module is connected to the comparator module and the power drive module, and the logic control module is configured to: obtain a comparison result of the comparator module; if the comparison result is that the voltage is greater than or equal to a voltage threshold, control the drive voltage generated by the power drive module to be reduced to a preset value lower than the voltage threshold.

4. The display module according to claim 1 or 2, wherein: The detection control module comprises: A subtractor module is connected to opposite ends of the sampling resistor, and is configured to: obtain the potentials at both ends of the sampling resistor; and calculate the difference between the potentials at both ends of the sampling resistor according to the potentials at both ends of the sampling resistor, wherein the difference is the voltage on the sampling resistor; A logic control module is connected to the subtractor module and the power drive module, and the logic control module is configured to: obtain the voltage on the sampling resistor calculated by the subtractor module, compare the voltage on the sampling resistor with the voltage threshold, and obtain a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, control the driving voltage generated by the power drive module to be reduced to a preset value lower than the voltage threshold; or, The resistance value of the sampling resistor and the voltage on the sampling resistor calculated by the subtractor module are obtained, and the current flowing through the sampling resistor is calculated according to the resistance value of the sampling resistor and the voltage on the sampling resistor; the current flowing through the sampling resistor is compared with a current threshold to obtain a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold.

5. The display module according to claim 1 or 2, wherein: The detection control module comprises: A logic control module is connected to two opposite ends of the sampling resistor, and the logic control module is configured to: obtain the potentials at the two ends of the sampling resistor; and calculate the difference between the potentials at the two ends of the sampling resistor according to the potentials at the two ends of the sampling resistor, wherein the difference is the voltage on the sampling resistor; The logic control module is further configured to: compare the voltage on the sampling resistor with a voltage threshold to obtain a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, control the driving voltage generated by the power driving module to be reduced to a preset value lower than the voltage threshold; or, The resistance value of the sampling resistor is obtained, and the current flowing through the sampling resistor is calculated according to the resistance value of the sampling resistor and the voltage on the sampling resistor; the current flowing through the sampling resistor is compared with the current threshold to obtain a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold.

6. The display module according to claim 5, further comprising: The analog-to-digital conversion module is connected between the logic control module and the sampling resistor. The analog-to-digital conversion module is configured to obtain the potential at both ends of the sampling resistor, convert the potential at both ends of the sampling resistor from an analog potential signal to a digital potential signal, and output it to the logic control module respectively.

7. The display module according to claim 1 or 2, wherein: The preset value is equal to 0V.

8. The display module according to claim 1 or 2, wherein: The resistance of the sampling resistor ranges from 1 mΩ to 2 mΩ.

9. The display module according to claim 1 or 2, further comprising: The polarizer is arranged on the display side of the display panel.

10. A display module, comprising: Display panel; A power driver module is configured to generate a driving voltage; a voltage signal line connected between the display panel and the power driving module, wherein the voltage signal line is configured to transmit the driving voltage generated by the power driving module to the display panel to make the display panel emit light; A sampling resistor, connected in series to the voltage signal line; A detection output module is connected to two opposite ends of the sampling resistor, and the detection output module is configured to: detect and output the voltage on the sampling resistor or the current flowing through the sampling resistor; Chip-on-film circuit board, including: substrate; a first connecting electrode and a second connecting electrode located on the substrate, wherein the first connecting electrode is connected to the display panel; The voltage signal line comprises: a first conductive portion located on the substrate and connected between the first connection electrode and the second connection electrode; a second conductive portion connected between the second connection electrode and the power driving module; Wherein, the sampling resistor is located in the second conductive part.

11. The display module according to claim 10, wherein: The detection output module comprises: A subtractor module is connected to two opposite ends of the sampling resistor, and is configured to obtain the potentials at the two ends of the sampling resistor, and calculate the difference between the potentials at the two ends of the sampling resistor according to the potentials at the two ends of the sampling resistor, wherein the difference is the voltage on the sampling resistor; The analog-to-digital conversion module is connected to the subtractor module, and is configured to convert the calculated voltage on the sampling resistor from an analog voltage signal to a digital voltage signal, and output the digital voltage signal.

12. A display device, comprising: The display module according to any one of claims 1 to 9; or, The display module as claimed in claim 10 or 11.

13. A method for driving a display module, wherein: The display module includes: a display panel, a power drive module, a voltage signal line, a sampling resistor, a chip-on-film circuit board and a detection control module, the voltage signal line is connected between the display panel and the power drive module, the sampling resistor is connected in series to the voltage signal line, the detection control module is connected to the opposite ends of the sampling resistor, and the detection control module is also connected to the power drive module, the chip-on-film circuit board includes a substrate, a first connection electrode and a second connection electrode located on the substrate, the first connection electrode is connected to the display panel, the voltage signal line includes: a first conductive portion located on the substrate and connected between the first connection electrode and the second connection electrode; a second conductive portion connected between the second connection electrode and the power drive module; wherein the sampling resistor is located at the second conductive portion; The driving method comprises: The detection control module detects and obtains the voltage on the sampling resistor or the current flowing through the sampling resistor; If the detection control module determines that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold; or, if the detection control module determines that the current is greater than or equal to the current threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold.

14. The method for driving a display module according to claim 13, wherein: The detection control module includes: a subtractor module, a comparator module and a logic control module, the subtractor module is connected to the opposite ends of the sampling resistor, the comparator module is connected to the subtractor module, the logic control module is connected to the comparator module, and the logic control module is also connected to the power drive module; The driving method comprises: The subtractor module obtains the potential at both ends of the sampling resistor; and calculates the difference between the potentials at both ends of the sampling resistor according to the potentials at both ends of the sampling resistor, wherein the difference is the voltage on the sampling resistor; The comparator module obtains the voltage on the sampling resistor calculated by the subtractor module, and compares the voltage on the sampling resistor with a voltage threshold to obtain a comparison result; The logic control module obtains the comparison result of the comparator module, and if the comparison result is that the voltage is greater than or equal to the voltage threshold, controls the driving voltage generated by the power driving module to be reduced to a preset value lower than the voltage threshold.

15. The method for driving a display module according to claim 13, wherein: The detection control module includes a subtractor module and a logic control module, the subtractor module is connected to opposite ends of the sampling resistor, the logic control module is connected to the subtractor module, and the logic control module is also connected to the power drive module; The driving method comprises: The subtractor module obtains the potential at both ends of the sampling resistor; and calculates the difference between the potentials at both ends of the sampling resistor according to the potentials at both ends of the sampling resistor, wherein the difference is the voltage on the sampling resistor; The logic control module obtains the voltage on the sampling resistor calculated by the subtractor module, compares the voltage on the sampling resistor with the voltage threshold, and obtains a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold; or, The logic control module obtains the resistance value of the sampling resistor and the voltage on the sampling resistor calculated by the subtractor module, and calculates the current flowing through the sampling resistor according to the resistance value of the sampling resistor and the voltage on the sampling resistor; compares the current flowing through the sampling resistor with the current threshold to obtain a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold.

16. The method for driving a display module according to claim 13, wherein: The detection control module includes a logic control module, the logic control module is connected to the opposite ends of the sampling resistor, and the logic control module is also connected to the power drive module; The driving method comprises: The logic control module obtains the potential at both ends of the sampling resistor; and calculates the difference between the potentials at both ends of the sampling resistor according to the potentials at both ends of the sampling resistor, where the difference is the voltage on the sampling resistor; The logic control module compares the voltage on the sampling resistor with the voltage threshold to obtain a comparison result; if the comparison result is that the voltage is greater than or equal to the voltage threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold; or, The logic control module obtains the resistance value of the sampling resistor, and calculates the current flowing through the sampling resistor according to the resistance value of the sampling resistor and the voltage on the sampling resistor; compares the current flowing through the sampling resistor with the current threshold to obtain a comparison result; if the comparison result is that the current is greater than or equal to the current threshold, the driving voltage generated by the power driving module is controlled to be reduced to a preset value lower than the voltage threshold.

17. The method for driving a display module according to claim 16, wherein: The display module further includes an analog-to-digital conversion module, which is connected between the logic control module and the sampling resistor; Before the logic control module acquires the potentials at both ends of the sampling resistor, the driving method further includes: The analog-to-digital conversion module obtains the potential at both ends of the sampling resistor, converts the potential at both ends of the sampling resistor from analog potential signals to digital potential signals, and outputs the digital potential signals to the logic control module respectively.

18. A method for driving a display module, wherein: The display module comprises: a display panel, a power driving module, a voltage signal line, a sampling resistor, a COF circuit board and a detection output module, wherein the voltage signal line is connected between the display panel and the power driving module, the sampling resistor is connected in series to the voltage signal line, and the detection output module is connected to opposite ends of the sampling resistor. The COF circuit board comprises a substrate, a first connection electrode and a second connection electrode located on the substrate, the first connection electrode is connected to the display panel, and the voltage signal line comprises: a first conductive portion located on the substrate and connected between the first connection electrode and the second connection electrode; a second conductive portion connected between the second connection electrode and the power driving module; wherein the sampling resistor is located at the second conductive portion; The driving method comprises: The detection output module detects and outputs the voltage on the sampling resistor or the current flowing through the sampling resistor.

19. The method for driving a display module according to claim 18, wherein: The detection output module includes: a subtractor module and an analog-to-digital conversion module, the subtractor module is connected to opposite ends of the sampling resistor, and the analog-to-digital conversion module is connected to the subtractor module; The driving method comprises: The subtractor module obtains the potential at both ends of the sampling resistor; and calculates the difference between the potentials at both ends of the sampling resistor according to the potentials at both ends of the sampling resistor, wherein the difference is the voltage on the sampling resistor; The analog-to-digital conversion module converts the voltage on the sampling resistor calculated by the subtractor module from an analog voltage signal to a digital voltage signal, and outputs the digital voltage signal.

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