Grating compensation driving circuit, grating compensation method and display module

Abstract

The application discloses a grating compensation driving circuit, a grating compensation method and a display module. The circuit comprises a controller, a driving circuit connected with the controller, n output ends of the driving circuit connected with n electrode ports of a grating module respectively, the driving circuit being used for outputting corresponding driving signal voltages, n input ends of a multi-channel selection circuit connected with the corresponding n electrode ports respectively, the multi-channel selection circuit being used for sequentially outputting sampling signals of each electrode port, a signal acquisition module, an input end of the signal acquisition module connected with an output end of the multi-channel selection circuit, an output end of the signal acquisition module connected with the controller, and the controller being used for adjusting the driving signal voltages outputted by the driving circuit to each electrode port according to the acquired sampling signals of each electrode port. The embodiment of the application can adjust each driving signal voltage outputted by the driving circuit, so that each strip-shaped electrode receives the same size of voltage, the pure color picture display is realized, and the stripe phenomenon is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a grating compensation driving circuit, a grating compensation method and a display module. BACKGROUND

[0002] At present, in a liquid crystal display device, a plurality of strip gratings need to be connected with a driving circuit through signal lines to receive a driving signal voltage provided by the driving circuit. When displaying a picture of the same gray scale, the driving signal voltages provided by each output end of the driving circuit usually remain consistent.

[0003] Due to differences in the actual production process, there are differences in the signal lines in different grating modules. And due to the differences in the length and bending mode of the different internal signal lines connecting each strip grating, the signal lines corresponding to different strip electrodes in the same grating module will also be different.

[0004] Therefore, even if the driving circuit provides the same driving signal voltage, due to the influence of the signal lines, each strip grating is not the same, which will cause differences in the actual received voltages of each strip electrode, thereby causing a strip phenomenon when displaying a picture of the same gray scale. SUMMARY

[0005] The embodiments of the present application provide a grating compensation driving circuit, a grating compensation method and a display module, which can improve the strip phenomenon of a liquid crystal device when displaying a picture of the same gray scale in the related art.

[0006] In a first aspect, the embodiments of the present application provide a grating compensation driving circuit applied to a display module, comprising:

[0007] a controller;

[0008] a driving circuit, an input end of the driving circuit being connected with the controller, n output ends of the driving circuit being respectively connected with n electrode ports of a grating module; wherein the electrode ports are electrically connected with corresponding n strip electrodes; the driving circuit is used for outputting corresponding driving signal voltages according to instruction signals provided by the controller;

[0009] a multi-channel selection circuit, n input ends of the multi-channel selection circuit being respectively connected with corresponding n electrode ports; the multi-channel selection circuit is used for sequentially outputting sampling signals of each electrode port;

[0010] a signal acquisition module, an input end of the signal acquisition module being connected with an output end of the multi-channel selection circuit, and an output end of the signal acquisition module being connected with the controller;

[0011] the controller is used for adjusting the driving signal voltages outputted by the driving circuit to each electrode port according to the acquired sampling signals of each electrode port.

[0012] In a second aspect, the embodiments of the present application provide a grating compensation method, applied to the grating compensation driving circuit of the first aspect, the method comprising:

[0013] In the case that the driving circuit provides driving signal voltages to the n electrode ports, the controller controls the shooting module to shoot the display brightness of the plurality of sub-display regions; wherein the plurality of sub-display regions are display regions corresponding to the plurality of strip electrodes of the grating respectively;

[0014] Based on the display brightness of each sub-display region, the driving circuit adjusts the driving signal voltages of the n output ends, so that the display brightness of each sub-display region matches the target brightness corresponding to the first gray scale;

[0015] The signal acquisition module acquires n first sampling signals corresponding to the n electrode ports respectively;

[0016] According to the voltage size of the n first sampling signals, a first proportional relationship is generated; wherein the first proportional relationship contains the voltage ratio between each first sampling signal;

[0017] The controller controls the driving circuit to provide driving signal voltages corresponding to the second gray scale to the n electrode ports; wherein the second gray scale is at least one gray scale in the target gray scale interval;

[0018] The signal acquisition module acquires a reference sampling signal corresponding to one of the electrode ports;

[0019] Based on the first proportional relationship, the driving circuit adjusts the driving signal voltages of the remaining (n-1) output ends, so that the voltage ratio of the second sampling signals corresponding to the remaining (n-1) electrode ports and the reference sampling signal satisfies the first proportional relationship.

[0020] In a third aspect, the embodiments of the present application provide a display module, comprising the grating compensation driving circuit of the first aspect.

[0021] Compared with the prior art, the grating compensation driving circuit, the grating compensation method and the display module provided by the embodiments of the present application, the controller can acquire the sampling signals of each electrode port through the multi-channel selection circuit. When the sampling signals of each electrode port are inconsistent, the voltage size of the sampling signals of each electrode port can be kept consistent by adjusting the driving signal voltages of each output end of the driving circuit, and then the voltage size received by each strip electrode can be kept consistent, so that the pure color picture display under the same gray scale is realized. By adjusting the driving signal voltages output to each electrode port, the electrode difference of different strip electrodes in the grating module can be compensated, the pure color picture display is realized, and the stripe phenomenon is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0023] Figure 1 is a module structure schematic diagram of a grating compensation driving circuit provided by an embodiment of the present application;

[0024] Figure 2 is a film layer structure schematic diagram of a grating module provided by an embodiment of the present application;

[0025] Figure 3 is a module structure schematic diagram of a driving circuit provided by an embodiment of the present application;

[0026] Figure 4 is a circuit structure schematic diagram of a driving circuit provided by an embodiment of the present application;

[0027] Figure 5 is a circuit structure schematic diagram of a multi-channel selection circuit provided by an embodiment of the present application;

[0028] Figure 6 is a structure schematic diagram of a strip electrode and a connection wire provided by an embodiment of the present application;

[0029] Figure 7 is a flowchart of a grating compensation method provided by an embodiment of the present application;

[0030] Figure 8 is an equivalent resistance schematic diagram of a strip electrode and a connection wire provided by an embodiment of the present application;

[0031] Figure 9 is a structure schematic diagram of a display module provided by an embodiment of the present application;

[0032] Figure 10 is a structure schematic diagram of a display module provided by another embodiment of the present application.

[0033] In the drawings:

[0034] 10, controller; 20, driving circuit; 30, multi-channel selection circuit; 40, signal acquisition module; 21, first signal amplification circuit; 22, second signal amplification circuit; 31, multi-channel selection unit; 50, external communication interface. DETAILED DESCRIPTION

[0035] The features and exemplary embodiments of the various aspects of the present application will be described in detail below with reference to the drawings. For the purpose of clarity, not all features of the aspects of the present application are described in the description below. It should be appreciated that all the features of the present application described above and below can be replaced by alternative features serving the same, equivalent, or similar purposes, unless otherwise specified. The description of the embodiments is merely intended to provide a better understanding of the present application.

[0036] It should be noted that the relative terms, such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or other elements inherent in such a process, method, article or apparatus. Without more limitations, the elements defined by the statement "comprising" do not exclude the presence of additional identical elements in the process, method, article or apparatus including the elements.

[0037] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The embodiments will be described in detail below with reference to the accompanying drawings.

[0038] At present, in a liquid crystal display device, a plurality of strip-shaped gratings need to be connected with a driving circuit through signal lines to receive a driving signal voltage provided by the driving circuit. When displaying a picture of the same gray scale, the driving signal voltages provided by each output terminal of the driving circuit usually remain consistent.

[0039] Due to differences in the actual production process, there are differences in the signal lines in different grating modules. And due to the differences in length and bending mode of different internal signal lines connecting each strip-shaped grating, it will lead to differences in the signal lines corresponding to different strip-shaped electrodes in the same grating module.

[0040] Therefore, even if the driving circuit provides the same driving signal voltage, due to the influence of the signal lines, each strip-shaped grating is not the same, which will lead to differences in the actual received voltages of each strip-shaped electrode, thereby causing the appearance of strip-shaped phenomenon when displaying the same gray scale picture.

[0041] To solve the above technical problems, the application provides a grating compensation driving circuit, a grating compensation method and a display module. First, the display panel provided by the application is introduced.

[0042] Figure 1 A structural schematic diagram of a grating compensation driving circuit 20 provided by an embodiment of the application is shown. The grating compensation driving circuit 20 can be applied to a display panel. The grating compensation driving circuit 20 can include a controller 10, a driving circuit 20, a multi-channel selection circuit 30 and a signal acquisition module 40.

[0043] The display module includes a grating module, which includes n independent strip electrodes, a full-area electrode and an FPC (Flexible circuit board) electrically connected to the strip electrodes and the full-area electrode. The FPC is provided with an electrode port electrically connected to the strip electrodes and an electrode port electrically connected to the full-area electrode.

[0044] Figure 2 A film layer structure schematic diagram of a single liquid crystal pixel point in the grating module is shown, which includes an array substrate 41, a gate insulating layer 42, a passivation layer 43, a gate electrode 44, a metal layer 45, a first conductive thin film 46 and a second conductive thin film 47.

[0045] After different voltage signals are applied to the strip electrodes and the full-area electrode, for each liquid crystal pixel point, one of the conductive thin films near the liquid crystal pixel point can receive the voltage signal on the strip electrode through a TFT (Thin film Transistor), and the other conductive thin film can receive the voltage signal on the full-area electrode. The conductive thin films near the liquid crystal pixel point can form an electric field around the two conductive thin films when energized, and the liquid crystal in the electric field range can be deflected, so that the light emitted by the backlight light source can pass through the liquid crystal layer.

[0046] The input end of the driving circuit 20 can be connected to the controller 10, and the n output ends of the driving circuit 20 are respectively connected to the n electrode ports in the grating module, which are respectively electrically connected to the corresponding n strip electrodes. As shown in Figure 1 The n output ends of the driving circuit 20 can be respectively connected to the n electrode ports SEG1, SEG2,..., SEGn of the grating module, which can respectively communicate with the n strip electrodes, and the COM port of the grating module can communicate with the full-area electrode.

[0047] The driving circuit 20 can separately send corresponding voltage signals to the n strip electrodes through the n outputs. Under the instruction signal provided by the controller 10, the driving circuit 20 can output corresponding driving signal voltages to the corresponding strip electrodes through each output.

[0048] The multi-channel selection circuit 30 includes n inputs, which are also connected with the n electrode ports in the grating module respectively. When the driving circuit 20 outputs corresponding driving signal voltages to each electrode port, the multi-channel selection circuit 30 can sample and output the sampling signals of each electrode port. In addition, the multi-channel selection circuit 30 can realize the cyclic output of the sampling signals of the n electrode ports by sequentially switching the sampling signal output of each electrode port.

[0049] The input end of the signal acquisition module 40 can be connected with the output end of the multi-channel selection circuit 30, and the output end of the signal acquisition module 40 can be connected with the controller 10.

[0050] When the multi-channel selection circuit 30 switches to the sampling signal output of a certain electrode port, the controller 10 can obtain the sampling signal of the electrode port. When the multi-channel selection circuit 30 sequentially switches the sampling signal output of each electrode port, the controller 10 can sequentially obtain the sampling signal of each electrode port.

[0051] It should be noted that the above signal acquisition module 40 can convert the sampling signal output by the multi-channel selection circuit 30 into voltage, so that the output voltage after conversion is within the input voltage range of the sampling port of the controller 10. It can be understood that if the controller 10 itself has voltage conversion function, the sampling port of the controller 10 can be directly connected with the output end of the multi-channel selection circuit 30, and the signal acquisition module 40 can be omitted.

[0052] Since there are connection wires between the output end of the driving circuit 20 and the strip electrodes, when two output ends of the driving circuit 20 are connected with two strip electrodes respectively, if there is a difference in the design of the two connection wires, the length of the two connection wires will be different, which will result in a difference in the equivalent resistance of the two connection wires. If the driving circuit 20 outputs the same driving signal voltage through the two outputs, under the condition that the equivalent resistance of the two connection wires is inconsistent, the voltage division effect caused by resistance voltage division will also be different, resulting in that the voltages received by the two strip electrodes are not the same. In addition, in the process of production and manufacturing, not only the connection wires corresponding to the two strip electrodes in the same grating module are likely to have length difference, but also the connection wires corresponding to the same strip electrode in two different grating modules are likely to have length difference.

[0053] When the driving circuit 20 outputs the same driving voltage signal at multiple output ends, the controller 10 can collect the sampling signals of the electrode ports. Since the electrode ports are located between the output ends of the driving circuit 20 and the strip electrodes, the sampling signals of the electrode ports will be different due to the voltage division of the connecting wires. The controller 10 can adjust the driving signal voltage output by the driving circuit 20 to each electrode port according to the sampling signals collected by each electrode port. For example, after the controller 10 obtains the sampling signals of two electrode ports, if the sampling signal of the first electrode port is greater than that of the second electrode port, the controller 10 can control the driving circuit 20 to reduce the driving signal voltage output to the first electrode port, so that the voltages of the sampling signals of the two electrode ports are consistent.

[0054] Similarly, for n electrode ports, the controller 10 can adjust the driving signal voltage output to each electrode port by controlling the driving circuit 20, so that the voltages of the sampling signals of the n electrode ports remain consistent. At this time, it can be considered that the voltages actually received by the n strip electrodes remain consistent. When the display module needs to display a pure color screen of the same gray scale, the voltages received by each strip electrode remain consistent, which can make the brightness of each liquid crystal pixel point consistent, thereby realizing the display of the pure color screen.

[0055] It should be noted that when displaying a pure color screen of the same gray scale, the controller 10 can keep the brightness of each liquid crystal pixel point consistent after adjusting the driving signal voltage of each electrode port. At this time, the driving signal voltage corresponding to each electrode port can be stored as the driving signal voltage corresponding to each liquid crystal pixel point at this gray scale. When the display of the pure color screen at this gray scale is needed, the driving signal voltage of each liquid crystal pixel point can be read and output to the corresponding strip electrode through the multiple output ends of the driving circuit 20, so as to realize the display of the pure color screen at this gray scale.

[0056] In the embodiment, the controller 10 can collect the sampling signals of the electrode ports through the multi-channel selection circuit 30. When the sampling signals of the electrode ports are inconsistent, the controller 10 can adjust the driving signal voltage of each output end of the driving circuit 20 to make the sampling signals of the electrode ports consistent, and then make the voltages received by each strip electrode consistent, thereby realizing the display of the pure color screen at the same gray scale. By adjusting the driving signal voltage output to each electrode port, the electrode difference of different strip electrodes in the grating module can be compensated, the display of the pure color screen can be realized, and the stripe phenomenon can be improved.

[0057] It should be noted that the above embodiment only illustrates the process of adjusting and compensating the driving signal voltage at a single gray scale to realize the display of a pure color picture. In the gray scale interval that needs to be adjusted and compensated, each gray scale can be adjusted and compensated respectively, or part of the binding point gray scales can be selected in the gray scale interval, and the compensation results of the remaining non-binding point gray scales can be obtained through linear fitting or non-linear fitting after adjusting and compensating the binding point gray scales. For example, taking the gray scale interval of 0-16 gray scales as an example, the driving signal voltage corresponding to each liquid crystal pixel point at each gray scale can be obtained by adjusting and compensating each gray scale in the gray scale interval of 0-16 gray scales. Alternatively, 2, 4, 8 and 16 gray scales can be selected as binding point gray scales from the gray scale interval of 0-16 gray scales to obtain the driving signal voltage corresponding to each liquid crystal pixel point at each binding point gray scale. Taking a single liquid crystal pixel point as an example, after obtaining the driving signal voltage corresponding to the binding point gray scale 8 and the binding point gray scale 16, if the display gray scale 12 is needed, the driving signal voltage corresponding to the gray scale 12 can be obtained by linear fitting or non-linear fitting based on the driving signal voltage corresponding to the binding point gray scale 8 and the driving signal voltage corresponding to the binding point gray scale 16, and the fitting function is used to determine the driving signal voltage corresponding to the gray scale 12. In addition to the above, the driving signal voltage corresponding to the gray scale 12 can also be obtained by mean value calculation, weighted mean value calculation, etc., which is not limited here.

[0058] Please refer to Figure 3 In some embodiments, the driving circuit 20 can include a first signal amplification circuit 21 and n second signal amplification circuits 22.

[0059] The input end of the first signal amplification circuit 21 is connected with the first voltage signal end DAC of the controller 10, and the controller 10 can output a first voltage signal through the first voltage signal end DAC.

[0060] The input ends of the n second signal amplification circuits 22 are all connected with the output end of the first signal amplification circuit 21, and the output ends of the n second signal amplification circuits 22 are respectively connected with the corresponding n electrode ports.

[0061] The first voltage signal end DAC of the controller 10 can provide a first voltage signal to the first signal amplification circuit 21, and adjust the signal amplification multiple of the first signal amplification circuit 21 and the signal amplification multiple of the n second signal amplification circuits 22 respectively.

[0062] The driving signal voltage outputted by each output terminal of the driving circuit 20 is the voltage of the first voltage signal after being amplified by the first signal amplification circuit 21 and the corresponding second signal amplification circuit 22. After determining the signal amplification multiple of the first signal amplification circuit 21, the signal amplification multiple of each second signal amplification circuit 22 is adjusted, so that each output terminal of the driving circuit 20 can independently output different driving signal voltages.

[0063] Please refer to Figure 4 In some embodiments, the first signal amplification circuit 21 can include a first total resistance Rtotal1, a second total resistance Rtotal2, a first operational amplifier U1, and a first variable resistor VRtotal1.

[0064] The inverting input terminal of the first operational amplifier U1 is grounded through the first total resistance Rtotal1, and the non-inverting input terminal of the first operational amplifier U1 is connected to the controller 10 through the second total resistance Rtotal2. The controller 10 can provide the first voltage signal to the non-inverting input terminal of the first operational amplifier U1. The first variable resistor VRtotal1 is connected between the inverting input terminal and the output terminal of the first operational amplifier U1. The controller 10 can adjust the resistance value of the first variable resistor VRtotal1.

[0065] As an optional implementation, please continue to refer to Figure 4 The inverting input terminal and the output terminal of the first operational amplifier U1 can also be provided with a feedback capacitor Ctotal.

[0066] The first total resistance Rtotal1, the second total resistance Rtotal2, the first operational amplifier U1, and the first variable resistor VRtotal1 can constitute a non-inverting amplifier. The signal amplification multiple of the non-inverting amplifier is associated with the resistance values of the two resistances connected to the inverting input terminal. For example, the calculation formula of the first amplification multiple A1 of the first signal amplification circuit 21 can be:

[0067] A1 = 1 + VRtotal / Rtotal1;

[0068] Wherein, VRtotal is the resistance value of the first variable resistor, and Rtotal1 is the resistance value of the first total resistance.

[0069] That is, the controller 10 can adjust the first amplification multiple of the first signal amplification circuit 21 by adjusting the resistance value of the first variable resistor VRtotal1.

[0070] In some embodiments, the second signal amplification circuit 22 includes a voltage follower.

[0071] Please continue to refer to Figure 4The voltage follower includes a second operational amplifier U2, the non-inverting input of which is connected to the output of the first operational amplifier U1, and the inverting input of which is connected to the output of the second operational amplifier U2. After the first operational amplifier U1 amplifies the first voltage signal by a first amplification factor, the voltage follower can isolate and output the amplified signal, thereby achieving signal isolation between the first operational amplifier U1 and the back-end components, and mutual isolation between the second signal amplification circuits 22.

[0072] The second signal amplifying circuit 22 may further include a first resistor, a second resistor, a third operational amplifier U3, a third resistor, and a second variable resistor. Figure 4 As shown, among the n second signal amplifying circuits, the i-th second signal amplifying circuit includes a first resistor R(3i-2), a second resistor R(3i-1), a third resistor R3i, and a second variable resistor VRi.

[0073] The inverting input of the third operational amplifier U3 is grounded via a first resistor, and the non-inverting input of the third operational amplifier U3 is connected to the output of the second operational amplifier U2 via a second resistor. The third resistor is connected between the non-inverting input of the third operational amplifier U3 and ground. The second variable resistor is connected between the inverting input and the output of the third operational amplifier U3.

[0074] As an optional implementation, a feedback capacitor may also be provided between the inverting input terminal and the output terminal of the third operational amplifier U3 , that is, the i-th second signal amplifying circuit further includes a feedback capacitor Ci.

[0075] The first resistor, second resistor, third operational amplifier U3, third resistor, and second variable resistor described above can form a non-inverting amplifier. The second and third resistors can act as a voltage divider, dividing the primary amplified signal output by the first operational amplifier U1 before inputting it into the non-inverting input of the third operational amplifier U3. The signal amplification factor of the third operational amplifier U3 is correlated with the first resistor and the second variable resistor. The controller 10 can adjust the second amplification factor of the second signal amplification circuit 22 by adjusting the resistance value of the second variable resistor.

[0076] It should be noted that after the second resistor and the third resistor divide the voltage, the signal input to the third operational amplifier U3 is the divided signal. At this time, the third operational amplifier U3 can amplify the divided voltage signal with a second amplification factor.

[0077] For each output terminal of the driving circuit 20 , after being amplified twice by the first signal amplifying circuit 21 and the corresponding second signal amplifying circuit 22 , a corresponding driving signal voltage can be output.

[0078] In some embodiments, the first variable resistor VRtotal1 and the second variable resistors can be adjustable resistors or digital potentiometers. The controller 10 can adjust the resistance of the first variable resistor VRtotal1 and the n second variable resistors respectively through corresponding control signals.

[0079] It can be understood that the first variable resistor VRtotal1 and the second variable resistors can be the same type of resistor or different types of resistors. Similarly, any two second variable resistors can be the same type of resistor or different types of resistors.

[0080] Please refer to Figure 5 In some embodiments, the multi-channel selection circuit 30 includes n voltage followers and a multiplexing unit 31.

[0081] Each of the n voltage followers can include a second operational amplifier U2, and the input end of the second operational amplifier U2 is electrically connected with the corresponding electrode port. The n input ends of the multiplexing unit 31 are respectively connected with the output ends of the n second operational amplifiers U2. The output end of the multiplexing unit 31 is connected with the signal acquisition module 40, and the control end of the multiplexing unit 31 is connected with the controller 10.

[0082] The controller 10 can provide an encoding signal and an enable signal to the multiplexing unit 31. When the multiplexing unit receives the enable signal, it can decode the received encoding signal to obtain a corresponding strobe signal. Based on the received strobe signal, the multiplexing unit 31 can connect one of the voltage followers with the signal acquisition module 40, so as to output the sampling signal of the corresponding electrode port to the signal acquisition module 40. For example, when the multiplexing unit 31 connects the port S2 with the port S0, it is equivalent to outputting the electrode port SEG2 to the signal acquisition module 40 through the output end VG.

[0083] When the strobe signal provided by the controller 10 is a traversal cycle signal of the multiple input ends, the multiplexing unit 31 can output the sampling signals of the respective electrode ports to the signal acquisition module 40 in turn.

[0084] After the controller 10 obtains the sampling signals of the respective electrode ports through the signal acquisition module 40, it can adjust the driving signal voltage output by the output end corresponding to each electrode port in the driving circuit 20 according to the sampling signal of the electrode port, so as to finally make the sampling signals of the respective electrode ports consistent. At this time, it can be approximately considered that the actual received voltages of the respective strip electrodes are the same, so as to enable the display module to realize the display of a pure color picture.

[0085] It should be noted that the connection wires between the output end of the driving circuit 20 and the strip-shaped electrodes include the first connection wires Line1 between the output end of the driving circuit 20 and the electrode ports and the second connection wires Line2 between the electrode ports and the strip-shaped electrodes. Since the electrode ports are connection ports integrated on the FPC, the n electrode ports also need to be connected to the strip-shaped electrodes through different second connection wires respectively. In the wiring design of each second connection wire, the length of each second connection wire is not completely consistent. For example Figure 6 As shown in the figure, taking the strip-shaped electrodes corresponding to the two electrode ports SEG1 and SEG2 as an example, the wiring lengths of the two first connection wires Line1 may be different, and the wiring lengths of the two second connection wires Line2 may also be different, thereby causing the equivalent resistances of each first connection wire Line1 to be different and the equivalent resistances of each second connection wire Line2 to be different. Therefore, even if the driving signal voltage output by the driving circuit 20 is adjusted so that the sampling signals of each electrode port remain consistent, it only means that the voltage shared by each strip-shaped electrode and the second connection wire Line2 is consistent. When the lengths of each second connection wire Line2 are different, the equivalent resistances of each second connection wire Line2 are also different, thereby causing the voltage shared by each second connection wire Line2 to be different. Therefore, in the above embodiment, since the lengths of the second connection wires Line2 connected by each strip-shaped electrode are different, the voltage actually received by each strip-shaped electrode after the driving circuit 20 adjusts the driving signal voltage will still be different.

[0086] In order to further solve the technical problem that after adjusting the driving signal voltage output by the driving circuit to each electrode port, the voltage received by each strip-shaped electrode is still inconsistent in the above embodiment, the present application also provides a grating compensation method.

[0087] Figure 7 A flowchart of a grating compensation method provided by an embodiment of the present application is shown. The method can include the following steps:

[0088] S110, in the case where the driving circuit provides driving signal voltages to the n electrode ports, controlling the shooting module to obtain the display brightness of the plurality of sub-display regions; wherein the plurality of sub-display regions are display regions corresponding to the plurality of strip-shaped electrodes of the grating respectively;

[0089] S120, adjusting the driving signal voltages of the n output ends of the driving circuit based on the display brightness of each sub-display region, so that the display brightness of each sub-display region matches the target brightness corresponding to the first gray scale;

[0090] S130, acquire n first sampling signals corresponding to n electrode ports respectively by the signal acquisition module;

[0091] S140, generate a first proportional relationship according to the voltage of the n first sampling signals; wherein the first proportional relationship contains the voltage ratio between each first sampling signal;

[0092] S150, control the driving circuit to provide a driving signal voltage corresponding to a second gray scale to the n electrode ports; wherein the second gray scale is at least one gray scale in the target gray scale interval;

[0093] S160, acquire a reference sampling signal corresponding to one of the electrode ports by the signal acquisition module;

[0094] S170, based on the first proportional relationship, adjust the driving signal voltage of the remaining (n-1) output terminals of the driving circuit, so that the voltage ratio of the second sampling signal corresponding to the remaining (n-1) electrode ports and the reference sampling signal satisfies the first proportional relationship.

[0095] In this embodiment, when the driving circuit provides a voltage signal to the n electrode ports, the display brightness of each sub-display area corresponding to each strip electrode can be captured by the shooting module, and the output driving signal voltage is adjusted based on the display brightness, so that the display brightness of each sub-display area matches the target brightness of the first gray scale. At this time, n first sampling signals can be acquired by sampling n electrode ports respectively, and the voltage ratio between each first sampling signal can be determined to generate a first proportional relationship. After the driving circuit provides a driving signal voltage corresponding to a second gray scale to the n electrode ports, the driving signal voltage of the remaining (n-1) output terminals can be adjusted according to the reference sampling signal corresponding to one of the electrode ports, so that the voltage ratio of the second sampling signal of each electrode port and the reference sampling signal satisfies the first proportional relationship. When the voltage ratio of any two sampling signals satisfies the first proportional relationship, it can be determined that the two strip electrodes can receive the same voltage, so that the actual received voltage of each strip electrode remains consistent, realizing the display of pure color picture and improving the vertical stripe phenomenon under the pure color picture. Moreover, when the display brightness of multiple gray scales needs to be compensated, the shooting module is only needed to be used for shooting in the compensation process of one gray scale, and the shooting process can be omitted in the compensation process of other gray scales, so as to greatly reduce the time length of each display module occupying the shooting module in the compensation process, and improve the use efficiency of the shooting module and the overall compensation efficiency.

[0096] The following will take the compensation process of the display module displaying a pure color picture of the first gray scale as an example to introduce the specific implementation mode of each step.

[0097] In S110, the display module stores a preset driving signal voltage corresponding to the first gray scale, and the controller can control the driving circuit to provide the same preset driving signal voltage to the n electrode ports. At this time, due to the voltage division effect of the equivalent resistance of the connection wire, the actual voltage received by the n strip electrodes will be different, resulting in the generation of vertical stripes in the display module, and the display of a pure color picture cannot be realized.

[0098] At this time, the display area of the display module can be photographed by the shooting module to obtain the display brightness of the plurality of sub-display areas. The plurality of sub-display areas are respectively the display areas corresponding to the plurality of strip electrodes of the grating.

[0099] It can be understood that each strip electrode can correspond to a column of liquid crystal pixel points. When the same driving signal voltage is provided to the strip electrodes, due to the unchanged voltage division effect of the connection wire, the strip electrodes will sequentially provide the same voltage signal to the same column of liquid crystal pixel points, so that the same column of liquid crystal pixel points maintains the same brightness. Different strip electrodes will cause a brightness difference between the columns of liquid crystal pixel points due to the difference in the received voltage signal, that is, the vertical stripe phenomenon is generated.

[0100] In S120, after determining the display brightness of each sub-display area corresponding to each strip electrode, the driving signal voltage of the n output ends of the driving circuit can be adjusted according to the display brightness of each sub-display area, so as to adjust the display brightness of each sub-display area, and finally make the display brightness of each sub-display area match the target brightness corresponding to the first gray scale.

[0101] In some embodiments, the above S120 can include:

[0102] Based on the display brightness of each sub-display area, a resistance value adjustment instruction is sent to each second variable resistor of the driving circuit to adjust the second amplification multiple of each second signal amplification circuit.

[0103] In this embodiment, taking the display brightness adjustment process of a single sub-display area as an example, after the display brightness of the sub-display area is photographed by the shooting module, the strip electrode corresponding to the sub-display area can be determined, and the second signal amplification circuit connected to the electrode port corresponding to the strip electrode can be determined. The controller can adjust the resistance value of the second variable resistor in the second signal amplification circuit by sending a resistance value adjustment instruction, so as to adjust the second amplification multiple of the second signal amplification circuit. When the second amplification multiple changes, the driving signal voltage output by the output end corresponding to the electrode port in the driving circuit will also change based on the change of the second amplification multiple, so that the voltage actually received by the strip electrode increases or decreases, and then the display brightness of the sub-display area is changed.

[0104] For each sub-display region, the above-mentioned mode can be adopted, the resistance value of the second variable resistor in the second signal amplification circuit corresponding to each strip-shaped electrode is adjusted by the resistance value adjustment instruction, the second amplification multiple of each second signal amplification circuit is independently adjusted, and the display brightness of each sub-display region is independently adjusted.

[0105] In S130, after the display brightness of each sub-display region is adjusted so that the display brightness of each sub-display region matches the target brightness corresponding to the first gray scale, n first sampling signals respectively corresponding to n electrode ports at this time can be obtained by the signal acquisition module.

[0106] Since the display brightness of each sub-display region remains consistent, it can be considered that the actual voltage received by each strip-shaped electrode at this time remains consistent. However, since there is a second connection wire between the strip-shaped electrode and the electrode port, and the second connection wires corresponding to each strip-shaped electrode are different, the voltage distributed on each second connection wire will not be completely consistent. At this time, the first sampling signal of each electrode port collected by the signal acquisition module is actually the sum of the voltage on the strip-shaped electrode and the voltage on the second connection wire.

[0107] In some embodiments, the above-mentioned S130 can include:

[0108] The strobe signal is sent to the multi-channel selection circuit to make the multi-channel selection unit sequentially connect the n electrode ports with the signal acquisition module, and sequentially obtain the n first sampling signals.

[0109] In this embodiment, since the multi-channel selection unit can only connect one electrode port with the signal acquisition module at any time. In order to obtain the sampling signal of each electrode port, the controller can send a strobe signal to the multi-channel selection unit of the multi-channel selection circuit. The strobe signal can drive the multi-channel selection unit to sequentially connect the n electrode ports with the signal acquisition module.

[0110] When the multi-channel selection unit connects each electrode port with the signal acquisition module, the controller can obtain the first sampling signal of the electrode port from the signal acquisition module. After the multi-channel selection unit sequentially connects all electrode ports with the signal acquisition module, the controller can obtain n first sampling signals respectively corresponding to n electrode ports.

[0111] In S140, after obtaining the n first sampling signals, a first proportional relationship can be generated according to the voltage size of the n first sampling signals. The first proportional relationship contains the voltage ratio between each first sampling signal.

[0112] In some embodiments, the above-mentioned S140 can include:

[0113] S210, determining a reference sampling signal from the n first sampling signals;

[0114] S220, calculating voltage ratios of each of the remaining first sampling signals to the reference sampling signal to generate a first proportional relationship.

[0115] In S210, after obtaining the n first sampling signals, a reference sampling signal can be determined from the n first sampling signals.

[0116] In some embodiments, S210 described above can include:

[0117] Selecting the first sampling signal with the maximum voltage or the minimum voltage from the n first sampling signals as the reference sampling signal.

[0118] In the present embodiment, the first sampling signal with the maximum voltage can be selected as the reference sampling signal from the n first sampling signals, or the first sampling signal with the minimum voltage can be selected as the reference sampling signal.

[0119] As another alternative implementation, the reference sampling signal can also be an average, a median, a mode, or a weighted average of the n first sampling signals, without limitation.

[0120] In S220, after determining the reference sampling signal, the voltage ratios of each of the remaining first sampling signals to the reference sampling signal can be calculated to generate a first proportional relationship.

[0121] It should be noted that taking the n first sampling signals as an example, if a certain first sampling signal is selected from the n first sampling signals as the reference sampling signal, then the voltage ratios of the remaining n-1 first sampling signals to the reference sampling signal need to be calculated respectively. If the average, the median, the mode, or the weighted average of the n first sampling signals is taken as the reference sampling signal, then the voltage ratios of the n first sampling signals to the reference sampling signal need to be calculated respectively.

[0122] In S150, the controller can control the driving circuit to provide a voltage signal corresponding to a second gray scale to the n electrode ports. The second gray scale can be at least one gray scale in the target gray scale interval.

[0123] The voltage signal corresponding to the second gray scale is the preset driving signal voltage of the second gray scale. The controller can control the driving circuit to output the same preset driving signal voltage through the n outputs. Apparently, at this time, although the preset driving signal voltages output by the n outputs are the same, the voltages actually received by each strip electrode are different, and the display module will produce vertical stripe phenomenon when displaying a solid color picture of the second gray scale.

[0124] In S160, the controller can acquire the reference sampling signal corresponding to one of the electrode ports through the signal acquisition module.

[0125] In some embodiments, the electrode port corresponding to the reference sampling signal is a reference electrode port; and S160 can include:

[0126] The reference selection signal is sent to the multiplexing unit of the multi-channel selection circuit, so that the multiplexing unit connects the reference electrode port with the signal acquisition module to obtain the reference sampling signal.

[0127] In this embodiment, the controller can send the reference selection signal to the multiplexing unit of the multi-channel selection circuit, so that the multiplexing unit determines the reference electrode port from the plurality of electrode ports and connects the input end corresponding to the reference electrode port with the output end, so that the reference electrode port is connected with the signal acquisition module, and the controller can acquire the reference sampling signal through the signal acquisition module.

[0128] In S170, after determining the reference sampling signal corresponding to one of the electrode ports, the driving signal voltage of the remaining (n-1) output ends in the driving circuit can be adjusted based on the first proportional relationship acquired in advance, so that the voltage ratio of the second sampling signal corresponding to the remaining (n-1) electrode ports and the reference sampling signal satisfies the first proportional relationship.

[0129] In some embodiments, S170 can include:

[0130] S310, the selection signal is sent to the multiplexing unit of the multi-channel selection circuit, so that the multiplexing unit sequentially connects the remaining (n-1) electrode ports with the signal acquisition module;

[0131] S320, in the case where each electrode port is connected with the signal acquisition module, the driving signal voltage of the output end corresponding to the electrode port in the driving circuit is adjusted, so that the second voltage ratio of the second sampling signal corresponding to the electrode port and the reference sampling signal is consistent with the first voltage ratio corresponding to the electrode port; wherein the first voltage ratio corresponding to the electrode port is the voltage ratio of the first sampling signal corresponding to the electrode port and the reference sampling signal.

[0132] In S310, the controller can send the selection signal to the multiplexing unit of the multi-channel selection circuit, and the multiplexing unit can sequentially connect the remaining (n-1) electrode ports with the signal acquisition module according to the received selection signal.

[0133] In S320, when each electrode port is connected with the signal acquisition module, the controller can acquire the sampling signal of the electrode port. The controller can adjust the sampling signal of the electrode port by adjusting the driving signal voltage of the output end corresponding to the electrode port in the driving circuit. For example, when the controller increases the driving signal voltage of the output end, the sampling signal of the electrode port also increases; otherwise, the sampling signal of the electrode port decreases.

[0134] When the controller adjusts the driving signal voltage of the output end corresponding to each electrode port in the driving circuit, the controller can perform feedback adjustment according to the real-time acquired sampling signal of the electrode port, until the second voltage ratio of the sampling signal of the electrode port to the reference sampling signal is consistent with the first voltage ratio. The first voltage ratio is the voltage ratio of the first sampling signal corresponding to the electrode port to the reference sampling signal in the correction process of the shooting module.

[0135] When the second voltage ratio of the second sampling signal corresponding to each electrode port to the reference sampling signal is adjusted to be consistent with the first voltage ratio, it can be considered that each strip electrode can receive the same voltage, so as to realize the display of the pure color picture.

[0136] As an optional embodiment, the following takes 1 reference electrode port and 1 ordinary electrode port as an example for description.

[0137] The driving circuit can output the driving signal voltage corresponding to the first gray scale to the output end corresponding to each of the two electrode ports.

[0138] Please refer to Figure 8 For the reference electrode port, the equivalent resistance of the corresponding strip electrode is A1, the equivalent resistance of the second connection wire between the strip electrode and the reference electrode port is B1, and the signal voltage of the acquired first sampling signal is V1; for the ordinary electrode port, the equivalent resistance of the corresponding strip electrode is A2, the equivalent resistance of the second connection wire between the strip electrode and the reference electrode port is B2, and the signal voltage of the acquired first sampling signal is V2.

[0139] After the display brightness of the two electrode ports is adjusted by the display brightness acquired by the shooting module, the display brightness of the display areas corresponding to the two strip electrodes can be consistent. At this time, the voltages shared by the two strip electrodes can be considered equal, so that:

[0140] V1*A1 / (A1+B1)=V2*A2 / (A2+B2);

[0141] Wherein, V1 is the total voltage of the strip-shaped electrode and the second connecting trace, A1 / (A1+B1) is the ratio of the equivalent resistance of the strip-shaped electrode to the total resistance, and the product of V1 and A1 / (A1+B1) is the voltage shared by the strip-shaped electrode of the reference electrode port; similarly, the product of V2 and A2 / (A2+B2) is the voltage shared by the strip-shaped electrode of the common electrode port.

[0142] Taking the first sampling signal of the reference electrode port as the reference sampling signal, the first voltage ratio of the common electrode port to the reference electrode port is V2 / V1, and the following can be obtained:

[0143] V2 / V1=(A1 / (A1+B1)) / (A2 / (A2+B2));

[0144] After obtaining the first voltage ratio of the two first sampling signals, the controller can control each output end of the driving circuit to output a voltage signal corresponding to a second gray scale. At this time, the reference sampling signal of the reference electrode port can be obtained as Va, and the voltage received by the strip-shaped electrode of the reference electrode port is:

[0145] Va*A1 / (A1+B1);

[0146] After adjusting the driving signal voltage output to the common electrode port based on the reference sampling signal Va, the voltage ratio of the second sampling signal Vb collected by the common electrode port to the reference sampling signal Va can satisfy V2 / V1, that is:

[0147] Vb / Va=V2 / V1;

[0148] At this time, Vb=Va*(V2 / V1);

[0149] Since the equivalent resistance A2 of the strip-shaped electrode corresponding to the common electrode port and the equivalent resistance B2 of the second connecting trace between the strip-shaped electrode and the electrode port do not change, the actual voltage received by the strip-shaped electrode of the common electrode port at this time is:

[0150] Vb*(A2 / A2+B2);

[0151] Substituting the above Vb=Va*(V2 / V1) and V2 / V1=(A1 / (A1+B1)) / (A2 / (A2+B2)) into the following can be obtained:

[0152] Vb*(A2 / A2+B2)

[0153] =Va*(V2 / V1)*(A2 / (A2+B2)

[0154] =Va*(A1 / (A1+B1)) / (A2 / (A2+B2))*(A2 / (A2+B2)

[0155] = Va * (A1 / (A1+B1));

[0156] At this time, the voltage actually received by the strip electrode of the reference electrode port is consistent with the voltage actually received by the strip electrode of the common electrode port. It can be approximated that the display brightness of the display sub-regions corresponding to the two strip electrodes respectively remains consistent.

[0157] Similarly, when a plurality of strip electrodes are included in the display module, the voltage actually received by the strip electrode of each electrode port can be adjusted to be consistent with the voltage actually received by the strip electrode of the reference electrode port by the above-mentioned manner, so that the brightness of each display sub-region under the second gray scale can remain consistent, and the vertical stripe phenomenon under the pure color picture is improved. Moreover, in the above-mentioned embodiment, when the display brightness of multiple gray scales needs to be compensated, only the shooting by the shooting module is needed in the compensation process of one gray scale, and the shooting process can be omitted in the compensation process of other gray scales, so that the time length of the shooting module occupied by each display module in the compensation process is greatly reduced, and the use efficiency and overall compensation efficiency of the shooting module are improved.

[0158] The application also provides a display module, please refer to Figure 9 The display module can include the grating compensation driving circuit provided by the above-mentioned embodiments of the application.

[0159] Please refer to Figure 10 In some embodiments, the above-mentioned display module can include at least two grating compensation driving circuits 100. The grating compensation driving circuit 100 can also include an external communication interface 50.

[0160] The external communication interface 50 can be connected with the controller 10, and when there are multiple grating compensation driving circuits 100, the external communication interface 50 can be connected in cascade with the external communication interface 50 of other grating compensation driving circuits 100.

[0161] The host computer can be connected with one of the multiple grating compensation driving circuits 100, and the remaining grating compensation driving circuits 100 can be connected with the host computer through the cascaded grating compensation driving circuits 100. Under the control of the host computer, the controller 10 of each grating compensation driving circuit 100 can adjust the driving signal voltage output by the driving circuit 20 to each electrode port, so that the brightness of the corresponding grating module under the same gray scale remains consistent. When the multiple grating compensation driving circuits 100 are connected in cascade, the brightness of the multiple grating modules under the same gray scale can remain consistent, and the pure color picture display of the multiple grating modules can be realized.

[0162] The electronic device can be a PC, a television, a display, a mobile terminal, a tablet computer, a wearable device, etc., and can include the display module provided in the embodiments of the present application.

[0163] The functional blocks shown in the structural block diagram described above can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a functional card, etc. When implemented in software, the elements of the present application are program or code segments used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted through a data signal carried in a carrier wave over a transmission medium or communication link. The "machine-readable medium" can include any medium capable of storing or transmitting information. Examples of the machine-readable medium include an electronic circuit, a semiconductor memory device, a ROM, a flash memory, an erasable ROM (EROM), a floppy disk, a CD-ROM, an optical disk, a hard disk, an optical fiber medium, a radio frequency (RF) link, etc. The code segments can be downloaded via a computer network such as the Internet, an intranet, etc.

[0164] It should be noted that, in this document, the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or device that includes a list of elements not only includes those elements, but also includes other elements not explicitly listed, or inherent to such a process, method, article, or device.

[0165] The principles and implementation modes of the present application are described by using specific examples in this document, and the above example descriptions are only used to help understand the method of the present application and its core idea. The above is only the preferred implementation mode of the present application. It should be noted that, due to the limited nature of the language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, refinements or changes can be made without departing from the principles of the present application, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or the direct application of the concepts and technical solutions of the present application to other fields without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A grating compensation drive circuit, characterized by, The application is applied to a display module, comprising: a controller; a driving circuit, an input end of the driving circuit is connected with the controller, n output ends of the driving circuit are respectively connected with n electrode ports of a grating module; wherein the electrode ports are electrically connected with corresponding n strip electrodes; the driving circuit is used for outputting corresponding driving signal voltages according to instruction signals provided by the controller; a multi-channel selection circuit, n input ends of the multi-channel selection circuit are respectively connected with corresponding n electrode ports; the multi-channel selection circuit is used for sequentially outputting sampling signals of each electrode port; a signal acquisition module, an input end of the signal acquisition module is connected with an output end of the multi-channel selection circuit, and an output end of the signal acquisition module is connected with the controller; the controller is used for adjusting the driving signal voltages output to each electrode port by the driving circuit according to the acquired sampling signals of each electrode port; the driving circuit comprises: a first signal amplification circuit, an input end of the first signal amplification circuit is connected with the controller; n second signal amplification circuits, input ends of the second signal amplification circuits are connected with an output end of the first signal amplification circuit, and output ends of the second signal amplification circuits are connected with corresponding electrode ports; the controller is used for providing a first voltage signal to the first signal amplification circuit, and adjusting signal amplification multiples of the first signal amplification circuit and n second signal amplification circuits respectively.

2. The grating compensation driving circuit according to claim 1, wherein the first signal amplification circuit comprises: a first total resistance; a second total resistance; a first operational amplifier, an inverting input end of the first operational amplifier is connected with ground through the first total resistance, and a non-inverting input end of the first operational amplifier is connected with the controller through the second total resistance; a first variable resistor, the first variable resistor is connected between the inverting input end and the output end of the first operational amplifier; the controller is used for adjusting a resistance value of the first variable resistor, so as to adjust a first amplification multiple of the first signal amplification circuit.

3. The grating compensation driving circuit according to claim 2, wherein the second signal amplification circuit comprises: a voltage follower, comprising a second operational amplifier, a non-inverting input end of the second operational amplifier is connected with an output end of the first operational amplifier, and an inverting input end of the second operational amplifier is connected with an output end of the second operational amplifier; a first resistance; a second resistance; a third operational amplifier, an inverting input end of the third operational amplifier is connected with ground through the first resistance, and a non-inverting input end of the third operational amplifier is connected with the output end of the second operational amplifier through the second resistance; a third resistance, the third resistance is connected between the non-inverting input end and a ground end of the third operational amplifier; a second variable resistor, the second variable resistor is connected between the inverting input end and the output end of the third operational amplifier; the controller is used for adjusting a resistance value of the second variable resistor, so as to adjust a second amplification multiple of the second signal amplification circuit.

4. The grating compensation driving circuit according to claim 3, wherein the first variable resistor and the second variable resistor are adjustable resistors or digital potentiometers.

5. The grating compensation driving circuit according to claim 1, wherein the multi-channel selection circuit comprises: n voltage followers, inputs of the voltage followers are electrically connected with corresponding electrode ports; a multiplexing unit, n inputs of the multiplexing unit are connected with outputs of the n voltage followers respectively, an output of the multiplexing unit is connected with the signal acquisition module, and a control end of the multiplexing unit is connected with the controller; the controller is further configured to provide a selection signal to the multiplexing unit.

6. A method of grating compensation, the method comprising: The method is applied to the grating compensation driving circuit in any one of claims 1-5, and the method comprises: In a case where the driving circuit provides driving signal voltages to the n electrode ports, the display brightness of the plurality of sub-display regions is captured by the photographing module; wherein the plurality of sub-display regions are display regions corresponding to the plurality of strip electrodes of the grating respectively; The driving signal voltages of the n outputs of the driving circuit are adjusted based on the display brightness of each sub-display region, so that the display brightness of each sub-display region matches the target brightness corresponding to the first gray scale; n first sampling signals corresponding to the n electrode ports are acquired by the signal acquisition module; A first proportional relationship is generated according to the voltage sizes of the n first sampling signals; wherein the first proportional relationship contains the voltage ratios between the first sampling signals; The driving circuit is controlled to provide driving signal voltages corresponding to a second gray scale to the n electrode ports; wherein the second gray scale is at least one gray scale in the target gray scale interval; A reference sampling signal corresponding to one of the electrode ports is acquired by the signal acquisition module; Based on the first proportional relationship, the driving signal voltages of the remaining (n-1) outputs of the driving circuit are adjusted, so that the voltage ratio between the second sampling signals corresponding to the remaining (n-1) electrode ports and the reference sampling signal satisfies the first proportional relationship.

7. The method of claim 6, wherein, The driving signal voltages of the n outputs of the driving circuit are adjusted based on the display brightness of each sub-display region, so that the display brightness of each sub-display region matches the target brightness corresponding to the first gray scale; Based on the display brightness of each sub-display region, resistance adjustment instructions are sent to each second variable resistor of the driving circuit to adjust the second amplification multiple of each second signal amplification circuit.

8. The method of claim 6, wherein, The n first sampling signals corresponding to the n electrode ports are acquired by the signal acquisition module, comprising: A selection signal is sent to the multiplexing unit of the multi-channel selection circuit, so that the multiplexing unit sequentially connects the n electrode ports with the signal acquisition module, and sequentially acquires the n first sampling signals.

9. The method of claim 6, wherein, The first proportional relationship is generated according to the voltage sizes of the n first sampling signals, comprising: A reference sampling signal is determined from the n first sampling signals; The voltage ratios between the remaining first sampling signals and the reference sampling signal are calculated to generate the first proportional relationship.

10. The method of claim 9, wherein, The reference sampling signal is determined from the n first sampling signals, comprising: The first sampling signal with the maximum voltage or the minimum voltage is selected as the reference sampling signal from the n first sampling signals.

11. The method of claim 9, wherein, The electrode port corresponding to the reference sampling signal is a reference electrode port; The reference sampling signal corresponding to one of the electrode ports is acquired by the signal acquisition module, comprising: The reference selection signal is sent to a multiplexing unit of the multi-channel selection circuit, so that the multiplexing unit connects the reference electrode port with the signal acquisition module to obtain a reference sampling signal.

12. The method of claim 11, wherein, The adjusting the driving signal voltage of the remaining (n-1) output terminals of the driving circuit based on the first proportional relationship comprises: The selection signal is sent to a multiplexing unit of the multi-channel selection circuit, so that the multiplexing unit sequentially connects the remaining (n-1) electrode ports with the signal acquisition module; In the case that each electrode port is connected with the signal acquisition module, the driving signal voltage of the output terminal corresponding to the electrode port in the driving circuit is adjusted, so that the second voltage ratio of the second sampling signal corresponding to the electrode port and the reference sampling signal is consistent with the first voltage ratio corresponding to the electrode port; wherein the first voltage ratio corresponding to the electrode port is the voltage ratio of the first sampling signal corresponding to the electrode port and the reference sampling signal.

13. A display module, characterized by The grating compensation driving circuit comprises the grating compensation driving circuit according to any one of claims 1-5.

14. The display module of claim 13, wherein, The display module comprises at least two grating compensation driving circuits; the grating compensation driving circuit further comprises: An external communication interface connected with the controller, the external communication interface is used for cascaded connection with the external communication interface of other grating compensation driving circuits; wherein, in the case that the grating compensation driving circuit is connected with the upper computer or connected with the upper computer through the cascaded grating compensation driving circuit, the controller is used for adjusting the driving signal voltage output to each electrode port by the driving circuit, so that the brightness of each grating module at the same gray level remains consistent.

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