Backlight driving circuit, backlight compensation method, backlight module and display module

Abstract

The application relates to a backlight driving circuit, a backlight compensation method, a backlight module and a display module. In the backlight driving circuit, a brightness compensation module is electrically connected with a backlight control module. The brightness compensation module obtains a brightness compensation value according to a fluctuation signal of a display panel in a display module received, and transmits the brightness compensation value to the backlight control module. The backlight control module is electrically connected with a backlight driver, and is used for obtaining a backlight driving signal according to the brightness compensation value and transmitting the backlight driving signal to the backlight driver. The backlight driver is also electrically connected with a light emitting device of the display module, and the backlight driver drives the light emitting device to selectively emit light according to the backlight driving signal. In the backlight driving circuit of the application, the brightness compensation module is arranged, the brightness compensation value is obtained according to the fluctuation signal corresponding to a Mura area in the display panel collected in real time, dynamic compensation of backlight data is realized, the light emitting brightness of the light emitting device is adjusted, and the problem of Mura appearing in display of the display panel is eliminated.

Description

Technical Field

[0001] This application relates to the field of liquid crystal display technology, and in particular to a backlight driving circuit, a backlight module including the backlight driving circuit, a display device including the backlight driving circuit, and a backlight compensation method for the backlight driving circuit. Background Technology

[0002] Currently, Mini LEDs and Micro LEDs have advantages such as small size, low power consumption, wide color gamut, and long lifespan, and are therefore increasingly used in display panel products. When Mini LEDs and Micro LEDs are used for backlighting displays, the large display panel size makes display defects caused by factors such as raw materials, manufacturing processes, and design, such as uneven brightness (mura), more easily visible to the naked eye, thus affecting the display effect and user experience.

[0003] In the current market, independent external compensation devices are typically used to perform external calculations for compensation on display panels. However, this method of externally calculating compensation for display panels using independent external compensation devices can only perform compensation algorithms for the monochrome image of the R, G, and B pixels corresponding to each grayscale level. This increases the time cost of obtaining compensation data, and requires individual compensation for each display panel, resulting in a large and repetitive workload and low compensation efficiency. Furthermore, when the Mura range of the display panel is large, it will be impossible to ship it after external calculation compensation. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide a backlight driving circuit, a backlight compensation method, a backlight module, and a display module. The backlight driving circuit, by setting a brightness compensation module, can collect the current fluctuation signal of the pixel unit corresponding to the Mura area in the display panel in real time, and obtain a brightness compensation value based on the fluctuation signal. This allows for real-time adjustment of the backlight data, achieving dynamic compensation of the backlight data and eliminating the Mura problem in the display panel.

[0005] In a first aspect, this application provides a backlight driving circuit, which includes a brightness compensation module, a backlight control module, and a backlight driver. The brightness compensation module is electrically connected to the backlight control module. The brightness compensation module receives a fluctuation signal from the display panel in the display module, obtains a brightness compensation value based on the fluctuation signal, and transmits the brightness compensation value to the backlight control module. The backlight control module is electrically connected to the backlight driver. The backlight control module obtains a backlight driving signal based on the brightness compensation value and transmits the backlight driving signal to the backlight driver. The backlight driver is also electrically connected to a light-emitting device in the display module, and the backlight driver drives the light-emitting device to selectively emit light according to the backlight driving signal.

[0006] In summary, the backlight driving circuit, by setting a brightness compensation module, can collect the current fluctuation signal of the pixel unit corresponding to the Mura area in the display panel in real time, and adjust the backlight data in real time according to the fluctuation signal, thereby realizing dynamic compensation of the backlight data, controlling the light-emitting device to selectively emit light, and eliminating the problem of Mura in the display panel.

[0007] Optionally, the brightness compensation module includes a signal processing unit, a signal conversion unit, and a compensation value calculation unit. The signal conversion unit is electrically connected to both the signal processing unit and the compensation value calculation unit, and the compensation value calculation unit is electrically connected to the backlight control module. The signal processing unit receives the fluctuation signal, filters and amplifies the fluctuation signal to obtain a signal to be compensated, and transmits the signal to be compensated to the signal conversion unit. The signal conversion unit converts the signal to be compensated to obtain a compensation signal and transmits the compensation signal to the compensation value calculation unit. The compensation value calculation unit obtains the brightness compensation value based on the compensation signal and transmits the brightness compensation value to the backlight control module.

[0008] By setting up a signal processing unit, a signal conversion unit, and a compensation value calculation unit in the brightness compensation module, the collected fluctuation signal is filtered, amplified, converted, and calculated to obtain a brightness compensation value. The brightness compensation value is then applied to the backlight control module to adjust the backlight data, thereby eliminating the problem of mura in the display panel.

[0009] Optionally, the signal processing unit includes a filtering circuit and an amplification circuit electrically connected to the filtering circuit. The filtering circuit filters the wave signal to obtain a filtered wave signal and transmits the filtered wave signal to the amplification circuit. The amplification circuit amplifies the filtered wave signal by a preset factor to obtain the signal to be compensated and transmits the signal to be compensated to the signal conversion unit.

[0010] By incorporating amplification and filtering circuits in the signal processing unit, smaller fluctuation signals are amplified, while the filtering circuits remove interference signals from the fluctuation signals, thereby improving the accuracy of obtaining brightness compensation values ​​based on the fluctuation signals. This, in turn, enhances the accuracy of dynamic compensation.

[0011] Optionally, the filtering circuit includes an inductor and a first capacitor, wherein a first end of the inductor receives the fluctuation signal, a second end of the inductor is electrically connected to the amplification circuit, a first end of the first capacitor is electrically connected to the amplification circuit, and a second end of the first capacitor is electrically connected to a reference ground; the filtered fluctuation signal is transmitted to the amplification circuit through the second end of the inductor.

[0012] In this embodiment, the filter circuit includes an inductor and a first capacitor. The first capacitor passes high frequencies and blocks low frequencies, while the inductor passes low frequencies and blocks high frequencies, thus filtering out interference signals in the fluctuating signal and improving the accuracy of obtaining the brightness compensation value based on the fluctuating signal.

[0013] Optionally, the amplification circuit includes an amplifier, which includes a non-inverting input terminal, an inverting input terminal, and a signal output terminal. The non-inverting input terminal is electrically connected to the second terminal of the inductor and the first terminal of the first capacitor, the inverting input terminal is electrically connected to the signal output terminal, and the signal output terminal is electrically connected to the signal conversion unit. The filtered fluctuation signal is input to the amplifier through the non-inverting input terminal. The amplifier amplifies the filtered fluctuation signal to obtain the signal to be compensated, and transmits the signal to be compensated to the signal conversion unit through the signal output terminal.

[0014] In this embodiment, the amplification circuit includes an amplifier that amplifies the smaller fluctuation signal by a preset factor, thereby improving the accuracy of obtaining the brightness compensation value based on the fluctuation signal.

[0015] Optionally, the signal conversion unit includes an analog-to-digital converter (ADC), a resistor, and a second capacitor. The ADC includes an input terminal, a threshold voltage terminal, a first power supply voltage terminal, a second power supply voltage terminal, and an output terminal. One end of the resistor is electrically connected to the signal output terminal of the amplifier, and the other end is electrically connected to the input terminal. One end of the second capacitor is electrically connected to the input terminal, and the other end is electrically connected to the reference ground. The output terminal is electrically connected to the compensation value calculation unit. The ADC receives the signal to be compensated from the signal output terminal of the amplifier, converts the signal to be compensated into a corresponding compensation signal, and transmits the compensation signal from the output terminal to the compensation value calculation unit. The ADC receives a power supply voltage through the first power supply voltage terminal, and the second power supply voltage terminal is electrically connected to the reference ground. The threshold voltage terminal receives a threshold voltage as a reference voltage for the ADC to convert the signal to be compensated into the compensation signal.

[0016] The signal conversion unit converts the signal to be compensated into a compensation signal, that is, it converts the analog signal into a digital signal, so that the compensation signal can be used to calculate the brightness compensation value.

[0017] Optionally, the compensation value calculation unit receives the compensation signal output from the output terminal of the analog-to-digital converter, compares the compensation signal with a pre-stored standard value to obtain the brightness compensation value that matches the compensation signal, and outputs the brightness compensation value to the backlight control module, wherein the pre-stored standard value is the standard voltage value corresponding to each gray level.

[0018] The compensation value calculation unit compares the compensation signal with the pre-stored standard value, adjusts the backlight data according to the difference, and then adjusts the luminous brightness of the light-emitting device, so that the luminous brightness of the display panel is dynamically adjusted.

[0019] Optionally, the brightness compensation module further includes a data acquisition chip and a circuit board. The data acquisition chip is electrically connected to the display panel and the circuit board, and the circuit board is electrically connected to the signal processing unit. The data acquisition chip acquires the fluctuation signal from the display panel and transmits the fluctuation signal to the signal processing unit through the circuit board.

[0020] The acquisition chip and circuit board acquire fluctuation signals and transmit them to the brightness compensation module, so that the fluctuation signals can be used for backlight data compensation.

[0021] Secondly, this application also provides a backlight compensation method, the backlight compensation method comprising:

[0022] Collect fluctuation signals from the display panel in the display module;

[0023] The brightness compensation value is obtained based on the fluctuation signal;

[0024] The backlight driving signal is obtained based on the brightness compensation value, and the light-emitting devices of the display module are driven to emit light selectively based on the backlight driving signal.

[0025] In summary, by utilizing the fluctuation signal of the current fluctuation of the pixel unit corresponding to the Mura area in the display panel in real time, the brightness compensation value is obtained, and then the backlight data is adjusted in real time to achieve dynamic compensation of the backlight data, control the brightness of the light-emitting device, and eliminate the problem of Mura in the display panel.

[0026] Optionally, obtaining the brightness compensation value based on the fluctuation signal includes:

[0027] The signal to be compensated is obtained after filtering and amplification of the fluctuation signal;

[0028] The signal to be compensated is converted and processed to obtain a compensated signal;

[0029] The brightness compensation value is obtained based on the compensation signal.

[0030] Thirdly, this application also provides a backlight module, which includes a plurality of light-emitting devices and the aforementioned backlight driving circuit. The plurality of light-emitting devices are electrically connected to the backlight driving circuit, and the backlight driving circuit is used to control the plurality of light-emitting devices to selectively emit light.

[0031] In summary, the backlight driving circuit of the backlight module is equipped with a brightness compensation module, which collects the current fluctuation signal of the pixel unit corresponding to the Mura area in the display panel in real time, and adjusts the backlight data in real time according to the fluctuation signal to realize dynamic compensation of the backlight data, control the brightness of the light-emitting device, and eliminate the problem of Mura in the display panel.

[0032] Fourthly, this application also provides a display module, the display module including a display panel and the aforementioned backlight module, the display panel being disposed on the light-emitting side of the backlight module, and the backlight module providing light for display to the display panel.

[0033] In summary, the backlight driving circuit in the backlight module is equipped with a brightness compensation module, which collects the current fluctuation signal of the pixel unit corresponding to the Mura area in the display panel in real time, and adjusts the backlight data in real time according to the fluctuation signal to achieve dynamic compensation of the backlight data, control the brightness of the light-emitting device, eliminate the Mura problem in the display panel, and improve the display effect of the display module. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a display device disclosed in an embodiment of this application;

[0035] Figure 2 for Figure 1 The diagram shows the structure of the display module in the display device.

[0036] Figure 3 for Figure 1 The circuit diagram of the display device shown is shown below;

[0037] Figure 4 for Figure 3 The circuit diagram of the backlight driving circuit of the display device shown is shown.

[0038] Figure 5 for Figure 4 The circuit diagram of the brightness compensation module shown is shown.

[0039] Figure 6 for Figure 5 The diagram shows the specific circuit structure of the brightness compensation module.

[0040] Figure 7 This is a schematic diagram of the storage of registers in the compensation value calculation unit in this embodiment of the application;

[0041] Figure 8 This is another circuit diagram of the brightness compensation module disclosed in the embodiments of this application;

[0042] Figure 9 This is a schematic flowchart of a backlight compensation method disclosed in an embodiment of this application;

[0043] Figure 10 for Figure 9 The flowchart of step S20 in the backlight compensation method shown is illustrated.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1000 - Display device;

[0046] 100 - Display Module;

[0047] 200 - Motherboard components;

[0048] 300 - Supporting Frame;

[0049] 110 - Display panel;

[0050] 111-pixel unit;

[0051] 113 - Data drive circuit;

[0052] 120-Backlight Module;

[0053] 121 - Light-emitting devices;

[0054] 123 - Backlight driving circuit;

[0055] 201-Drive Module;

[0056] 202-Power supply module;

[0057] 10-Brightness compensation module;

[0058] 15 - Acquisition chip;

[0059] 17-Circuit board;

[0060] 20 - Backlight control module;

[0061] 30 - Backlight driver;

[0062] 50 - Signal processing unit;

[0063] 51-Filtering circuit;

[0064] 51a - Inductor;

[0065] 51b - First capacitor;

[0066] 52-Amplifier circuit;

[0067] 521-Amplifier;

[0068] 60 - Signal conversion unit;

[0069] 62-Analog-to-Digital Converter;

[0070] 63 - Resistor;

[0071] 65 - Second capacitor;

[0072] 70 - Compensation value calculation unit;

[0073] GND - Reference Ground;

[0074] Ui - Fluctuation Signal;

[0075] a-node;

[0076] IN - Input terminal;

[0077] VREF - Threshold voltage terminal;

[0078] VDD - First power supply voltage terminal;

[0079] VSS - Second power supply voltage terminal;

[0080] OUT - Output terminal;

[0081] Verf - Threshold voltage;

[0082] Vdd - Power supply voltage;

[0083] S10~S30 - Steps of the backlight compensation method;

[0084] S21~S23 - Step S20 in the backlight compensation method. Detailed Implementation

[0085] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0086] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0087] Currently, Mini LEDs and Micro LEDs offer advantages such as small size, low power consumption, wide color gamut, and long lifespan, leading to their increasing application in display panel products. However, when Mini LEDs and Micro LEDs are used for backlighting displays, the larger display panel size makes display defects caused by factors such as raw materials, manufacturing processes, and design—such as uneven brightness (Mura)—more easily visible to the naked eye, thus affecting the display effect and user experience. In the current market, independent external compensation devices are typically used for external calculation compensation of the display panel. However, this method only allows for compensation algorithms to be applied to the monochrome image of the R, G, and B pixels corresponding to each grayscale level, increasing the time cost of obtaining compensation data. Furthermore, the workload is large and repetitive, requiring individual compensation for each display panel, resulting in low compensation efficiency. In addition, when the Mura range of the display panel is large, it cannot be compensated externally and will be deemed a defective product.

[0088] Therefore, this application aims to provide a solution that can solve the above-mentioned technical problems, the details of which will be described in subsequent embodiments.

[0089] Please see Figure 1 , Figure 1This is a schematic diagram of the structure of a display device 1000 disclosed in an embodiment of this application. Figure 1 As shown in the illustration, the display device 1000 provided in this application embodiment may include at least a display module 100, a motherboard assembly 200, and a support frame 300. The display module 100 is fixed to the support frame 300, and the motherboard assembly 200 is disposed on the back of the display module 100, i.e., the non-display surface of the display module 100, i.e., the side of the display module 100 facing away from the user. The display module 100 is used to display images. The motherboard assembly 200 is electrically connected to the display module 100 and is used to control the power supply of the entire display device 1000 and control various functional operations. The support frame 300 provides support and protection for the display module 100 and the motherboard assembly 200.

[0090] It is understood that the display module 100 also has a display surface disposed opposite to the non-display surface, that is, the front of the display module 100, i.e., the side of the display module 100 facing the user. The display surface is used to face the user using the display device 1000 to display images.

[0091] Please refer to the following: Figure 2 , Figure 2 for Figure 1 The diagram shows the structure of the display module 100 in the display device 1000. In this embodiment, the display module 100 may include at least a display panel 110 and a backlight module (BM) 120, wherein the display panel 110 is disposed on the light-emitting side of the backlight module 120, and the backlight module 120 is used to provide light for display to the display panel 110, and the display panel 110 emits corresponding light according to the image data to be displayed to perform image display.

[0092] In this embodiment of the application, the display panel 110 may be a Micro LED display panel or a Mini LED display panel.

[0093] In some embodiments, the display module 100 may also include other elements or components, such as a signal processor module, a signal sensing module, etc.

[0094] Please refer to the following: Figure 3 , Figure 3 for Figure 1 The circuit diagram of the display device 1000 is shown. Figure 3As shown in this embodiment, the display panel 110 includes a display area and a non-display area, the non-display area being disposed around the periphery of the display area, and the display panel 110 is used to display images. The motherboard assembly 200 may include at least a drive module 201 and a power module 202, the drive module 201 being electrically connected to the power module 202, the drive module 201 being used to drive the display device 1000 to perform various operations, and the power module 202 being used to provide operating voltage for the display device 1000 to perform various operations.

[0095] like Figure 3 As shown, the display panel 110 includes pixel units 111 and a data driving circuit 113. The pixel units 111 are disposed in the display area and are electrically connected to the data driving circuit 113. Meanwhile, the data driving circuit 113 is also electrically connected to the driving module 201 of the motherboard assembly 200.

[0096] In some embodiments, the motherboard component 200 may be a motherboard, also known as a mainboard, system board, or motherboard, which is used to provide operating voltage, drive current, and corresponding functional signals. This application does not impose any specific limitations on this.

[0097] In an exemplary embodiment of this application, the pixel unit 111 includes a driving element and liquid crystal molecules electrically connected to the driving element. The data driving circuit 113 outputs an image signal to the pixel unit 111. Simultaneously, the data driving circuit 113 receives a driving signal from the driving module 201 of the motherboard assembly 200 and outputs a voltage corresponding to the data signal contained in the driving signal, which is applied to the driving element in the pixel unit 111. This causes the driving element of the pixel unit 111 to drive the liquid crystal molecules to perform image display, thereby causing the driving element of the pixel unit 111 to drive the liquid crystal molecules of the liquid crystal layer to deflect at an angle corresponding to the image signal to emit light of corresponding brightness.

[0098] In a specific embodiment of this application, the current or voltage of some of the pixel units 111 can be transmitted to the driving module 201. The specific technical solution will be described in detail later.

[0099] like Figure 3As shown, the backlight module 120 includes a plurality of light-emitting devices 121 and a backlight driving circuit 123. The plurality of light-emitting devices 121 and the backlight driving circuit 123 are electrically connected, and the backlight driving circuit 123 is also electrically connected to the driving module 201. The backlight driving circuit 123 receives a backlight driving signal from the driving module 201 and drives some of the light-emitting devices 121 to emit light to different degrees according to the backlight driving signal, thereby providing backlight for the display panel 110 to display images.

[0100] In the exemplary embodiments of this application, it is understood that the display device also includes other structures, such as pixel circuits, which are disposed in the display area within the display panel for displaying images. This application only lists structures related to the inventive point.

[0101] Please refer to the following: Figure 4 , Figure 4 for Figure 3 The circuit diagram of the backlight driving circuit 123 of the display device shown is illustrated. Figure 4 As shown in this embodiment, the backlight driving circuit 123 may include at least a brightness compensation module 10, a backlight control module 20, and a backlight driver 30. The backlight control module 20 is electrically connected to both the brightness compensation module 10 and the backlight driver 30. The brightness compensation module 10 is also electrically connected to the driving module 201. The brightness compensation module 10 receives fluctuation signals from the driving module 201 of pixel units corresponding to the Mura region appearing in the display panel 110, and obtains a corresponding brightness compensation value based on the acquired fluctuation signals. The brightness compensation module 10 also transmits the brightness compensation value to the backlight control module 20. The backlight control module 20 receives and obtains the backlight driving signal based on the brightness compensation value, and then transmits the backlight driving signal to the backlight driver 30. The backlight driver 30 is also electrically connected to the light-emitting device 121 of the backlight module 120, and drives the light-emitting device 121 to emit light according to the backlight driving signal.

[0102] It is understood that the current of the pixel unit 111 corresponding to the area where Mura appears in the display panel 110 will fluctuate to a certain extent compared with the current of the pixel unit 111 corresponding to the non-Mura area. This fluctuating signal is denoted as the fluctuation signal.

[0103] In some embodiments, the backlight control module 20 and the brightness compensation module 10 can be integrated on a driver board, which is used to illuminate the display panel 110, parse image information, and display it on the display panel 110. The backlight control module 20 can be a backlight control chip, and this application does not impose specific limitations on it.

[0104] In one possible embodiment of this application, the backlight driver 30 may be a micro-driver, and this application does not impose any specific limitations on it.

[0105] In some embodiments, the backlight driver 30 can individually control multiple light-emitting devices 121 to emit light according to the backlight driving signal. In this case, when the backlight driver 30 controls the light-emitting device 121 corresponding to the pixel unit 111 in the Mura region to emit light according to the backlight driving signal transmitted by the backlight control module 20, it does not affect the backlight driver 30 driving other light-emitting devices 121 to emit light according to the original backlight driving signal.

[0106] In this embodiment, by setting the brightness compensation module 10, the current of the pixel unit 111 corresponding to the Mura area on the display panel will fluctuate to a certain extent compared with the current of the pixel unit 111 corresponding to the non-Mura area. During the display device 1000's display of the image, the fluctuation signal is collected in real time. It is understood that the fluctuation signal can be a current signal or a voltage signal, and this application does not impose any specific limitations on it.

[0107] Furthermore, the brightness compensation value is derived from the collected fluctuation signal and transmitted to the backlight control module 20. The backlight control module 20 and the backlight driver 30 then apply the brightness compensation value to the corresponding light-emitting device 121. This avoids the high time cost and workload associated with using a separate external compensation device for Mura compensation, enabling real-time data compensation of the backlight driving circuit, and thus achieving dynamic compensation for each grayscale level.

[0108] Please refer to the following: Figure 5 , Figure 5 for Figure 4 The circuit diagram of the brightness compensation module 10 shown is illustrated. Figure 5As shown in this embodiment, the brightness compensation module 10 may include at least a signal processing unit 50, a signal conversion unit 60, and a compensation value calculation unit 70. The signal conversion unit 60 is electrically connected to both the signal processing unit 50 and the compensation value calculation unit 70. The signal processing unit 50 is also electrically connected to the driving module 201, and is used to receive the collected fluctuation signal from the driving module 201, filter and amplify the collected fluctuation signal to obtain the signal to be compensated, and transmit the signal to be compensated to the signal conversion unit 60.

[0109] The signal conversion unit 60 is used to receive the signal to be compensated and convert the signal to obtain a compensation signal. The signal conversion unit 60 transmits the compensation signal to the compensation value calculation unit 70.

[0110] The compensation value calculation unit 70 is electrically connected to the backlight control module 20. The compensation value calculation unit 70 is used to receive the compensation signal and obtain the brightness compensation value according to the compensation signal, and transmit the brightness compensation value to the backlight control module 20.

[0111] Please refer to the following: Figure 6 , Figure 6 for Figure 5 The diagram shows the specific circuit structure of the brightness compensation module 10. Figure 6 As shown in this embodiment, the signal processing unit 50 includes a filtering circuit 51 and an amplification circuit 52, which are electrically connected. The filtering circuit 51 filters the wave signal to obtain a filtered wave signal and transmits the filtered wave signal to the amplification circuit 52. Specifically, it removes the mid-to-high frequency components from the wave signal Ui to obtain the filtered wave signal, and then transmits the filtered wave signal to the amplification circuit 52. The amplification circuit 52 receives the filtered wave signal and amplifies it by a preset factor to obtain the signal to be compensated, and then transmits the signal to be compensated to the signal conversion unit 60.

[0112] In some embodiments, the filtering circuit 51 may be a low-pass filter circuit, which includes an inductor 51a and a first capacitor 51b. Specifically, the first end of the inductor 51a receives the fluctuation signal. In some embodiments, the first end of the inductor 51a is electrically connected to the driving module 201, and receives the fluctuation signal Ui from the driving module 201; this application does not impose specific limitations on this. The second end of the inductor 51a is electrically connected to the amplification circuit 52, that is, the second end of the inductor 51a is electrically connected to node a, for transmitting the filtered fluctuation signal to the amplification circuit 52. It is understood that node a may be the signal output node of the filtering circuit 51, which can transmit the filtered fluctuation signal to the amplification circuit 52.

[0113] The first terminal of the first capacitor 51b is electrically connected to the amplifier circuit 52, that is, the first terminal of the first capacitor 51b is electrically connected to node a, and the second terminal of the first capacitor 51b is electrically connected to reference ground GND. Similarly, the first terminal of the inductor 51a is electrically connected to the drive module 201, the second terminal of the inductor 51a is electrically connected to the amplifier circuit 52 and the first terminal of the first capacitor 51b, and the second terminal of the first capacitor 51b is electrically connected to reference ground GND. The first capacitor 51b is used to conduct the AC component of the fluctuating signal Ui to reference ground GND and then release it, that is, to ground.

[0114] In some embodiments, the specific inductive reactance value of the inductor 51a can be selected according to the signal frequency in the pixel circuit, and this application does not impose specific limitations on it.

[0115] In some implementations, the capacitance and voltage rating of the first capacitor 51b can be selected based on the signal frequency and voltage in the pixel circuit, and this application does not impose specific limitations on this.

[0116] In this embodiment, the amplification circuit 52 receives the filtered fluctuation signal and amplifies it by a certain factor to obtain the corresponding signal to be compensated. The amplification circuit 52 transmits the signal to be compensated to the signal conversion unit 60. Specifically, the amplification circuit 52 may include an amplifier 521. In some embodiments, the amplification circuit 52 may be an operational amplifier circuit, and the amplifier 521 may be an operational amplifier.

[0117] In some embodiments, the amplifier 521 includes a non-inverting input terminal, an inverting input terminal, and a signal output terminal. The non-inverting input terminal is electrically connected to node a, and the inverting input terminal is electrically connected to the signal output terminal. That is, the non-inverting input terminal is electrically connected to the other end of the inductor 51a and one end of the first capacitor 51b, and the inverting input terminal is electrically connected to the signal output terminal. The non-inverting input terminal receives the filtered fluctuation signal from node a, and with the combined operation of the inverting input terminal, amplifies the filtered fluctuation signal to obtain the corresponding signal to be compensated. The signal to be compensated is transmitted from the signal output terminal of the amplifier 521 to the signal conversion unit 60. The current of the pixel unit 111 corresponding to the Mura area appearing on the display panel will fluctuate to a certain extent compared to the current of the pixel unit 111 corresponding to the non-Mura area.

[0118] In some embodiments, the fluctuations in the current of the pixel units 111 corresponding to the Mura region appearing on the display panel 110 are relatively small. Furthermore, the acquired fluctuation signal Ui is relatively small. The amplifier 521 can be selected as an amplifier with a small input bias current and a large amplification factor. It is understood that the specific input bias current and amplification factor of the amplifier 521 can be determined according to actual production needs, and this application does not impose specific limitations on them.

[0119] In some embodiments, if the fluctuation signal Ui of the pixel unit 111 corresponding to the Mura area appearing on the display panel is at the picoampere level (pA order of magnitude), the amplification preset factor of the amplifier 521 can be 3*10^6 times, and this application does not impose specific limitations on this.

[0120] like Figure 6 As shown in this embodiment, the signal conversion unit 60 receives the signal to be compensated from the signal output terminal of the amplifier 521, converts the signal to be compensated from an analog signal to a digital signal to obtain a corresponding compensation signal, and transmits the compensation signal to the compensation value calculation unit 70. The value of the compensation signal is the value of the data signal of the pixel unit 111 corresponding to the Mura area of ​​the display panel.

[0121] In some implementations, the signal to be compensated can be an analog signal, and the compensation signal can be a digital signal.

[0122] In this embodiment, the signal conversion unit 60 may include an analog-to-digital converter 62, a resistor 63, and a second capacitor 65. Specifically, the analog-to-digital converter 62 includes an input terminal IN, a threshold voltage terminal VREF, a first power supply voltage terminal VDD, a second power supply voltage terminal VSS, and an output terminal OUT. One end of the resistor 63 is electrically connected to the signal output terminal of the amplifier 521, and the other end of the resistor 63 is electrically connected to the input terminal IN of the analog-to-digital converter 62. One end of the second capacitor 65 is electrically connected to the input terminal IN, and the other end of the second capacitor 65 is electrically connected to the reference ground GND. The second capacitor 65 is used to suppress interference and improve the accuracy of the digital-to-analog conversion. The resistor 63 is used to create a voltage drop between the signal processing unit 50 and the analog-to-digital converter 62 to prevent damage to components in the circuit.

[0123] The analog-to-digital converter 62 receives the power supply voltage Vdd through the first power supply voltage terminal VDD, and the second power supply voltage terminal VSS is electrically connected to the reference ground GND. With the assistance of the first power supply voltage terminal VDD and the second power supply voltage terminal VSS, the analog-to-digital converter 62 completes the conversion of the fluctuating signal Ui.

[0124] The threshold voltage terminal VREF receives a threshold voltage Verf, which serves as the reference voltage for the analog-to-digital converter 62 to convert the signal to be compensated into a compensation signal. The output terminal OUT of the analog-to-digital converter 62 is electrically connected to the compensation value calculation unit 70. The compensation signal obtained by the analog-to-digital converter 62 is transmitted from the output terminal OUT to the compensation value calculation unit 70.

[0125] In some implementations, the threshold voltage Verf is the voltage value corresponding to the normal display of the Mura area on the display panel. It is understood that this threshold voltage is determined because the brightness compensation value calculation requires comparing the compensation signal with the voltage value corresponding to the normal display of the Mura area on the display panel; therefore, the reference voltage of the analog-to-digital converter 62 is determined to be the voltage value corresponding to the normal display of the Mura area on the display panel.

[0126] In some embodiments, the display module 100 may further include a driver IC, which is electrically connected to the threshold voltage terminal VREF and outputs a corresponding threshold voltage to the threshold voltage terminal VREF.

[0127] In some embodiments, if the grayscale of the display device 1000 is 8-bit color depth, i.e., has 0 to 255 grayscale levels, the analog-to-digital converter 62 can be an 8-bit analog-to-digital converter. It is understood that the number of bits in the analog-to-digital converter can be determined based on the number of bits in the grayscale color depth of the display device 1000, and this application does not impose specific limitations on this.

[0128] Please refer to the following: Figure 7 , Figure 7 This is a schematic diagram of the register storage in the compensation value calculation unit 70 in this embodiment of the application. In this embodiment, the compensation value calculation unit 70 can be a microcontroller unit. The microcontroller is electrically connected to both the analog-to-digital converter 62 and the backlight control module 20. The microcontroller (i.e., the compensation value calculation unit 70) is used to receive the compensation signal output from the analog-to-digital converter 62, compare the compensation signal with a pre-stored standard value, calculate the brightness compensation value that matches the compensation signal, and output the brightness compensation value to the backlight control module 20.

[0129] like Figure 7 As shown, in some embodiments, each gray level corresponds to a standard voltage value, i.e., a pre-stored standard value. For example, the gamma voltage at gray level 0 is 0 volts (V), and the gamma voltage at gray level 173 is 4.2 volts (V). The gamma voltage value is stored as a digital signal; for example, the gamma voltage of 4.2 volts (V) corresponds to decimal 256 in the analog-to-digital converter 62.

[0130] In this embodiment, the correspondence between different gray levels and their corresponding pre-stored standard values ​​is programmed and stored in the microcontroller. Specifically, the correspondence between different gray levels and their corresponding pre-stored standard values ​​can be stored in a register (Look-Up Table, LUT) in the microcontroller.

[0131] In this embodiment, after receiving the compensation signal, the microcontroller compares the compensation signal with the pre-stored standard value of the grayscale corresponding to the Mura area appearing on the display panel, calculates the brightness compensation value that matches the compensation signal according to the formula, and transmits the brightness compensation value to the backlight control module 20.

[0132] Combination Figures 3 to 7 The working process of the brightness compensation module 10 will be explained next using the grayscale of the display device 1000 as an example, which has an 8-bit color depth.

[0133] Currently, the display panel 110 normally displays a pure 173 grayscale image, but some areas of the display panel 110 show mura. If the data voltage value of the normal 173 grayscale image is 4.2V, the collected fluctuation signal Ui, after being filtered and amplified by the signal processing unit 50, yields a compensation signal of 4.1 volts. The 4.1-volt compensation signal is input to the analog-to-digital converter 62. The data voltage value of the normal 173 grayscale image, which is 4.2 volts, serves as the reference voltage for the analog-to-digital converter 62 to perform digital-to-analog conversion. At this time, the digital signal corresponding to 4.2 volts is 256, and the 4.1-volt compensation signal is converted into a compensation signal of 250 (decimal). The microcontroller (i.e., the compensation value calculation unit 70) calculates the brightness compensation value using a formula based on the pre-stored standard value of 256 corresponding to the 173 grayscale and the digital signal 250 of the compensation signal, and transmits the brightness compensation value to the backlight control module 20.

[0134] In this embodiment, the brightness compensation module 10 receives the fluctuation signal Ui of the pixel unit 111 corresponding to the Mura area appearing on the display panel. After filtering and amplification by the signal processing unit 50, the fluctuation signal Ui is converted from an analog signal to a digital signal by the signal conversion unit 60. The compensation value calculation unit 70 calculates the brightness compensation value based on the digital signal Ui and a pre-stored standard value, and applies it to the backlight module 120 to adjust the brightness of the light-emitting device 121 in the backlight module 120, thereby changing the brightness value corresponding to the grayscale displayed on the display panel 110. This achieves real-time dynamic compensation of the light-emitting data of the backlight module 120 controlling the light-emitting device 121 during the display device 1000's display process. It avoids the problems of high time cost and large workload caused by using a separate set of external compensation equipment for Mura compensation, and realizes real-time data compensation of the backlight driving circuit, thereby achieving dynamic compensation for each grayscale image.

[0135] Please refer to the following: Figure 8 , Figure 8 This is another circuit diagram of the brightness compensation module disclosed in an embodiment of this application. In this embodiment, compared to Figure 5The brightness compensation module 10 described in this embodiment further includes a data acquisition chip 15 and a circuit board 17. The data acquisition chip 15 is electrically connected to the display panel 110 and the circuit board 17 via a chip-on-flex (COF) process. The circuit board 17 is also electrically connected to the driving module 201. The data acquisition chip 15 acquires the fluctuation signal Ui from the display panel 110 and transmits it to the signal processing unit 50 via the circuit board 17. In some embodiments, the fluctuation signal Ui of the pixel circuits in different areas of the display panel 110 is transmitted to the driving module 201 via the data acquisition chip 15 and the circuit board 17. That is, the data acquisition chip 15 acquires the fluctuation signal Ui of the pixel unit 111 corresponding to the Mura region from the display panel 110, and the fluctuation signal Ui is transmitted to the signal processing unit 50 via the data acquisition chip 15 and the circuit board 17. It is understood that the drive module 201 can be electrically connected to both the circuit board 17 and the signal processing unit 50. The fluctuation signal Ui is transmitted to the drive module 201 via the circuit board 17, and then the drive module 201 transmits the fluctuation signal Ui to the signal processing unit 50.

[0136] In some embodiments, the circuit board 17 can be electrically connected to the driving module 201 via a connector, and this application does not impose specific limitations on this. In this case, the acquisition chip 15 acquires the fluctuation signal Ui of the pixel unit 111 corresponding to the Mura area from the display panel 110. The fluctuation signal Ui is transmitted to the driving module 201 via the acquisition chip 15, the circuit board 17 and the connector, and the driving module 201 transmits the fluctuation signal Ui to the signal processing unit 50.

[0137] In one possible embodiment, when the fluctuation signal Ui is a current signal, the signal processing unit 50 further includes a voltage conversion circuit (not shown). The voltage conversion circuit receives the current signal from the drive module 201, converts the current signal into a voltage signal, and transmits it to the filter circuit 51. When the fluctuation signal Ui is a voltage signal, there is no need for the voltage conversion circuit to convert the current signal into a voltage signal; the drive module 201 directly transmits the fluctuation signal Ui to the filter circuit 51.

[0138] In some embodiments, the circuit board 17 may be a flexible printed circuit (FPC), and this application does not impose any specific limitations on it.

[0139] In some implementations, the fluctuation signal Ui is led from the acquisition chip 15 to the connector via a passline. In this case, the flip-chip film used in the COF process, the circuit board 17, and the connector all require an additional trace.

[0140] Based on the same inventive concept, this application also provides a backlight module 120, which includes the aforementioned backlight driving circuit 123 and a plurality of light-emitting devices 121. The plurality of light-emitting devices 121 are electrically connected to the backlight driving circuit 123, and the backlight driving circuit 123 controls the plurality of light-emitting devices 121 to selectively emit light according to the backlight driving signal.

[0141] Based on the same inventive concept, this application also provides a display module 100, which includes a display panel 110 and the aforementioned backlight module 120. The display panel 110 is disposed on the light-emitting side of the backlight module 120, and the backlight module 120 provides display light to the display panel 110. The display panel 110 emits corresponding light according to the image data to be displayed to perform image display.

[0142] Please refer to the following: Figure 9 , Figure 9 This is a schematic flowchart of a backlight compensation method disclosed in an embodiment of this application. Based on the same concept, this application also provides a backlight compensation method for performing brightness compensation on the display module 100. This avoids the problems of high time cost, large workload, and repetitive work caused by using a separate set of external compensation equipment to perform Mura compensation on each display device 1000, thus simplifying the complexity of display compensation. It should be noted that the backlight compensation method of this application is not limited to... Figure 9 The flowchart shown illustrates the steps and their order. Depending on different needs, the steps in the flowchart can be added, removed, or their order changed. (Combined with...) Figures 3 to 8 As shown in the embodiments of this application, the backlight compensation method may include at least the following steps.

[0143] Step S10: Collect the fluctuation signal of the display panel in the display module.

[0144] In this embodiment, a fluctuation signal in the display panel 110 is acquired and transmitted to the brightness compensation module 10. Specifically, the fluctuation signal Ui in the display panel 110 is acquired by the acquisition chip 15 and transmitted to the brightness compensation module 10. In some embodiments, the fluctuation signal Ui can be acquired by the acquisition chip and then transmitted to the brightness compensation module 10 via the circuit board 17, the connector, and the drive module 201.

[0145] In some embodiments, when the fluctuation signal Ui is a current signal, the signal processing unit 50 of the brightness compensation module 10 further includes a voltage conversion circuit (not shown). The voltage conversion circuit receives the current signal from the driving module 201, converts the current signal into a voltage signal, and transmits it to the filtering circuit 51. When the fluctuation signal Ui is a voltage signal, there is no need for a voltage conversion circuit to convert the current signal into a voltage signal; the driving module 201 directly transmits the fluctuation signal Ui to the filtering circuit 51.

[0146] Step S20: Obtain the brightness compensation value based on the fluctuation signal.

[0147] In this embodiment, the brightness compensation module 10 obtains the brightness compensation value based on the fluctuation signal and transmits the brightness compensation value to the backlight control module 20.

[0148] Please refer to the following: Figure 10 , Figure 10 for Figure 9 The diagram illustrates step S20 of the backlight compensation method shown. In this embodiment, step S20 may include at least the following steps.

[0149] Step S21: After filtering and amplifying the fluctuation signal, the signal to be compensated is obtained.

[0150] In this embodiment, the signal processing unit 50 of the brightness compensation module 10 filters and amplifies the fluctuation signal to obtain the signal to be compensated, and then transmits the signal to be compensated to the signal conversion unit 60 of the brightness compensation module 10.

[0151] In this embodiment, the signal processing unit 50 includes a filtering circuit 51 and an amplifying circuit 52. The filtering circuit 51 filters and amplifies the fluctuation signal Ui before transmitting it to the amplifying circuit 52. The amplifying circuit 52 receives the filtered and amplified fluctuation signal Ui, amplifies it to obtain a corresponding signal to be compensated, and transmits the signal to be compensated to the signal conversion unit 60.

[0152] In some embodiments, filtering the fluctuation signal Ui mainly refers to filtering out mid-to-high frequency interference signals in the fluctuation signal Ui, and this application does not impose specific limitations on this.

[0153] Step S22: The signal to be compensated is converted and processed to obtain the compensated signal.

[0154] In this embodiment of the application, the signal conversion unit 60 converts and processes the signal to be compensated to obtain the compensation signal, and transmits the compensation signal to the compensation value calculation unit 70 of the brightness compensation module 10.

[0155] In this embodiment, the signal conversion unit 60 may include an analog-to-digital converter 62, a resistor 63, and a second capacitor 65. The signal conversion unit 60 receives the signal to be compensated from the amplifier 521, converts the signal to be compensated from an analog signal to a digital signal (i.e., obtains a compensation signal), and transmits the compensation signal to the compensation value calculation unit 70. The value of the compensation signal is the data signal value of the pixel unit corresponding to the Mura area of ​​the display panel.

[0156] In some implementations, the signal to be compensated can be an analog signal, and the compensation signal can be a digital signal.

[0157] Step S23: Obtain the brightness compensation value based on the compensation signal.

[0158] In this embodiment, the compensation value calculation unit 70 obtains the brightness compensation value based on the compensation signal and transmits the brightness compensation value to the backlight control module 20.

[0159] In this embodiment, the compensation value calculation unit 70 can be a microcontroller. The microcontroller receives the compensation signal output from the signal conversion unit 60, compares the compensation signal with a pre-stored standard value, calculates a brightness compensation value that matches the compensation signal, and transmits the brightness compensation value to the backlight control module 20.

[0160] Step S30: Obtain a backlight driving signal based on the brightness compensation value, and drive the light-emitting device of the display module to selectively emit light based on the backlight driving signal.

[0161] In this embodiment of the application, the backlight control module 20 obtains a backlight driving signal based on the brightness compensation value, and drives the light-emitting device 121 to selectively emit light based on the backlight driving signal.

[0162] In this embodiment, the backlight control module 20 drives the light-emitting device 121 to emit light according to the backlight driving signal. Alternatively, the backlight control module 20 can transmit the backlight driving signal to the backlight driver 30, and the backlight driver 30 can drive the light-emitting device 121 to emit light according to the backlight driving signal.

[0163] In some embodiments, the backlight driver 30 driving the light-emitting device 121 to emit light according to the backlight driving signal may refer to adjusting the luminance of the light-emitting device 121 using brightness dimming technology.

[0164] In summary, in the backlight driving circuit, backlight compensation method, backlight module 120, and display device 1000 of this application, a brightness compensation module 10 is set in the backlight driving circuit to collect the fluctuation signal Ui of the current fluctuation of the pixel unit corresponding to the Mura area in the display panel 110 in real time. After processing such as filtering, amplification, conversion, and calculation of the fluctuation signal Ui, a brightness compensation value is obtained. The brightness compensation value is used to adjust the backlight data of the backlight module 120 in real time, that is, to realize dynamic compensation of the backlight data. This greatly reduces the workload and avoids the problems of high time cost, large workload, and repetitive work caused by using a separate set of external compensation equipment to perform Mura compensation on each display device 1000, thus simplifying the complexity of display compensation. Furthermore, it greatly improves the compensation efficiency of the backlight module 120, eliminates the problem of Mura in the display panel 110, and improves the display effect of the display device 1000.

[0165] Meanwhile, this avoids the problem that external optical compensation of the display panel 110 using independent equipment can only perform compensation algorithms for the R, G, and B pixels corresponding to each grayscale level, increasing the time cost of obtaining compensation data. It enables real-time dynamic compensation when the display device 1000 displays any image at any grayscale level from 0 to 255.

[0166] All possible combinations of the various technical features in the above embodiments are described; however, as long as there is no contradiction in the combination of these technical features, they should all be considered to be within the scope of this specification.

[0167] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A backlight driving circuit, characterized in that, The backlight driving circuit includes a brightness compensation module, a backlight control module, and a backlight driver. The brightness compensation module is electrically connected to the backlight control module. The brightness compensation module is used to receive the fluctuation signal of the display panel in the display module, obtain a brightness compensation value according to the fluctuation signal, and transmit the brightness compensation value to the backlight control module. The backlight control module is electrically connected to the backlight driver. The backlight control module is used to obtain a backlight driving signal according to the brightness compensation value and transmit the backlight driving signal to the backlight driver. The backlight driver is also electrically connected to the light-emitting device of the display module, and the backlight driver drives the light-emitting device to selectively emit light according to the backlight driving signal; The brightness compensation module includes a signal processing unit, a signal conversion unit, and a compensation value calculation unit. The signal conversion unit is electrically connected to both the signal processing unit and the compensation value calculation unit. The compensation value calculation unit is electrically connected to the backlight control module. The signal processing unit is used to receive the wave signal, filter and amplify the wave signal to obtain the signal to be compensated, and transmit the signal to be compensated to the signal conversion unit. The signal conversion unit is used to convert the signal to be compensated to obtain a compensation signal, and then transmit the compensation signal to the compensation value calculation unit. The compensation value calculation unit is used to obtain the brightness compensation value according to the compensation signal, and transmit the brightness compensation value to the backlight control module; The compensation value calculation unit receives the compensation signal, compares the compensation signal with the pre-stored standard value of the gray level corresponding to the Mura area appearing on the display panel to obtain a brightness compensation value that matches the compensation signal, and outputs the brightness compensation value to the backlight control module, wherein the pre-stored standard value is the standard voltage value corresponding to each gray level.

2. The backlight driving circuit as described in claim 1, characterized in that, The signal processing unit includes a filtering circuit and an amplification circuit electrically connected to the filtering circuit, wherein... The filtering circuit filters the wave signal to obtain a filtered wave signal, and then transmits the filtered wave signal to the amplification circuit. The amplifier circuit amplifies the filtered fluctuation signal by a preset factor to obtain the signal to be compensated, and then transmits the signal to be compensated to the signal conversion unit.

3. The backlight driving circuit as described in claim 2, characterized in that, The filtering circuit includes an inductor and a first capacitor, wherein a first end of the inductor receives the oscillation signal, a second end of the inductor is electrically connected to the amplification circuit, a first end of the first capacitor is electrically connected to the amplification circuit, and a second end of the first capacitor is electrically connected to a reference ground. The filtered fluctuation signal is transmitted to the amplifier circuit through the second end of the inductor.

4. The backlight driving circuit as described in claim 3, characterized in that, The amplification circuit includes an amplifier, which includes a non-inverting input terminal, an inverting input terminal, and a signal output terminal. The non-inverting input terminal is electrically connected to the second terminal of the inductor and the first terminal of the first capacitor. The inverting input terminal is electrically connected to the signal output terminal, and the signal output terminal is electrically connected to the signal conversion unit. The filtered fluctuation signal is input to the amplifier through the non-inverting input terminal. The amplifier amplifies the filtered fluctuation signal to obtain the signal to be compensated, and transmits the signal to be compensated to the signal conversion unit through the signal output terminal.

5. The backlight driving circuit as described in claim 4, characterized in that, The signal conversion unit includes an analog-to-digital converter, a resistor, and a second capacitor. The analog-to-digital converter includes an input terminal, a threshold voltage terminal, a first power supply voltage terminal, a second power supply voltage terminal, and an output terminal. One end of the resistor is electrically connected to the signal output terminal of the amplifier, and the other end of the resistor is electrically connected to the input terminal. One end of the second capacitor is electrically connected to the input terminal, and the other end of the second capacitor is electrically connected to the reference ground. The output terminal is electrically connected to the compensation value calculation unit. The input terminal of the analog-to-digital converter receives the signal to be compensated from the signal output terminal of the amplifier, converts the signal to be compensated into a corresponding compensation signal, and transmits the compensation signal to the compensation value calculation unit through the output terminal; The analog-to-digital converter receives power voltage through the first power supply voltage terminal, and the second power supply voltage terminal is electrically connected to the reference ground. The threshold voltage terminal receives a threshold voltage, which serves as the reference voltage for the analog-to-digital converter to convert the signal to be compensated into the compensated signal.

6. The backlight driving circuit as described in any one of claims 2-5, characterized in that, The brightness compensation module further includes a data acquisition chip and a circuit board. The data acquisition chip is electrically connected to the display panel and the circuit board. The circuit board is electrically connected to the signal processing unit. The data acquisition chip acquires the fluctuation signal from the display panel and transmits the fluctuation signal to the signal processing unit through the circuit board.

7. A backlight compensation method, employing the backlight driving circuit as described in any one of claims 1 to 6, characterized in that, The backlight compensation method includes: Collect fluctuation signals from the display panel in the display module; The brightness compensation value is obtained based on the fluctuation signal; The backlight driving signal is obtained based on the brightness compensation value, and the light-emitting devices of the display module are driven to emit light selectively based on the backlight driving signal.

8. The backlight compensation method as described in claim 7, characterized in that, The step of obtaining the brightness compensation value based on the fluctuation signal includes: The signal to be compensated is obtained after filtering and amplification of the fluctuation signal; The signal to be compensated is converted and processed to obtain a compensated signal; The brightness compensation value is obtained based on the compensation signal.

9. A backlight module, characterized in that, The backlight module includes a plurality of light-emitting devices and a backlight driving circuit as described in any one of claims 1-6, wherein the plurality of light-emitting devices are electrically connected to the backlight driving circuit, and the backlight driving circuit is used to control the plurality of light-emitting devices to selectively emit light.

10. A display module, characterized in that, The display module includes a display panel and a backlight module as described in claim 9, wherein the display panel is disposed on the light-emitting side of the backlight module, and the backlight module provides light for display to the display panel.

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