Backlight module, display module and electronic device

Abstract

The present disclosure provides a backlight module, a display module and an electronic device. The backlight module comprises a backlight lamp plate, the backlight lamp plate comprises a substrate, a driving chip arranged on one side of the substrate, and a plurality of LED sub-zones. The driving chip comprises a signal processing module, an LED driving output module, and a plurality of current detection modules. The LED driving output module has a plurality of output ports. The signal processing module is connected with the LED driving output module. At least one output port is connected with one LED sub-zone and one current detection module. The current detection module is used for detecting the output current of the corresponding output port and feeding back the current detection result to the signal processing module. The signal processing module is used for receiving the current data sent by a driving control board, setting the output current of each output port of the LED driving output module according to the current data, and feeding back the current detection result to the driving control board.

Description

Technical Field

[0001] This disclosure relates to the field of display technology. More specifically, it relates to a backlight module, a display module, and an electronic device. Background Technology

[0002] With the continuous development of display technology, MiniLED backlight panels have been widely used in many fields such as televisions, monitors, and automotive displays due to their advantages of high brightness, high contrast, and low power consumption. MiniLED backlight panels achieve precise backlight control of the displayed image by independently controlling multiple LED chips according to different zones.

[0003] However, after the backlight board leaves the factory, the LED driving current of each zone cannot be accurately measured. Traditional testing methods usually rely on connecting an ammeter in series, which will damage the original circuit structure of the backlight board. Summary of the Invention

[0004] The purpose of this disclosure is to provide a backlight module, a display module, and an electronic device to solve the technical problem in the related art that the driving current of a single zone in a backlight board cannot be measured in real time and conveniently.

[0005] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0006] The first aspect of this disclosure provides a backlight module, including a backlight board. The backlight board includes a substrate, a driver chip disposed on one side of the substrate, and multiple LED zones. The driver chip includes a signal processing module, an LED driver output module, and multiple current detection modules. The LED driver output module has multiple output ports. The signal processing module is connected to the LED driver output module. At least one of the output ports is connected to one of the LED zones and one of the current detection modules. The current detection module is used to detect the output current of the corresponding output port and feed back the current detection result to the signal processing module. The signal processing module is used to receive current data sent by a driver control board, set the output current of each output port of the LED driver output module according to the current data, and feed back the current detection result to the driver control board.

[0007] Optionally, the backlight module further includes the driving control board, which includes a driving control module connected to the signal processing module. The driving control module is used to send the current data to the signal processing module, receive the current detection result fed back by the signal processing module, calculate the output error of each output port based on the current detection result, and adjust the output current of each output port based on the output error.

[0008] Optionally, the current data includes the set current of each output port. The step of the drive control module calculating the output error of each output port based on the current detection result and adjusting the output current of each output port based on the output error includes: calculating the difference between the output current of each output port and the set current based on the current detection result and the current data; for at least one output port, when the difference is greater than a preset value, outputting a control signal to the drive chip to reduce the output current of the output port in the drive chip; when the difference is less than the preset value, outputting a control signal to the drive chip to increase the output current of the output port in the drive chip; and when the difference is equal to the preset value, outputting a control signal to the drive chip to maintain the output current of the output port in the drive chip.

[0009] Optionally, the driver chip further includes a voltage detection module, which is connected to the LED driver output module and the signal processing module. The voltage detection module is used to detect the output voltage of the LED driver output module and feed back the voltage detection result to the signal processing module. The signal processing module is used to determine whether there is an overvoltage risk based on the voltage detection result.

[0010] Optionally, the driver chip further includes an open / short circuit module, which is connected to the LED driver output module and the signal processing module. The open / short circuit module is used to detect whether the output of the LED driver output module is short-circuited or open-circuited and to feed back the open / short circuit detection result to the signal processing module.

[0011] Optionally, the backlight panel includes at least one driver chip group, which includes multiple driver chips connected in sequence. The input terminal of the first driver chip is connected to the drive control module. The first driver chip is used to receive first current data sent by the drive control module, read the current data corresponding to itself from the first current data, add its own current detection result to the first current data, and then send it to the next driver chip. The last driver chip is used to receive the first current data sent by the previous driver chip, read the current data corresponding to itself from the first current data, add its own current detection result to the first current data, and then feed it back to the drive control module.

[0012] Optionally, the signal processing module feeds back the current detection result to the drive control module via serial communication.

[0013] Optionally, the backlight module further includes at least one adapter circuit board, which is connected to at least one of the driving chipsets. The adapter circuit board is used to transmit the first current data sent by the driving control module to the first driving chip in the driving chipset and to transmit the first current data fed back by the end driving chip in the driving chipset to the driving control module.

[0014] Optionally, the drive control board is also provided with a power supply circuit, which is used to provide operating voltage to the driver chip and LED partitions on the backlight board.

[0015] Optionally, the signal processing module is further configured to convert the current detection result into a digital signal and feed the converted current detection result back to the drive control board.

[0016] A second aspect of this disclosure provides a display module, including the backlight module described above.

[0017] A third aspect of this disclosure provides an electronic device including the display module described above.

[0018] The beneficial effects of this disclosure are as follows:

[0019] The backlight module of this embodiment of the present disclosure provides a current detection module at the output port of the LED driver output module. The current detection module can detect the actual drive current output by the corresponding output port and feed the current detection result back to the external driver control board. This enables real-time detection of the actual current of each LED zone without damaging the original circuit structure of the backlight board, simplifying the testing process of the backlight board and making it simple and convenient. Attached Figure Description

[0020] The specific embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of the backlight module provided in the embodiments of this disclosure;

[0022] Figure 2 A schematic diagram of the circuit structure of the driver chip provided in the embodiments of this disclosure;

[0023] Figure 3 This is a control logic diagram of a backlight module provided in an embodiment of the present disclosure. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0025] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0026] After the backlight board leaves the factory, its output drive current needs to be tested. Traditional drive current testing methods usually rely on connecting an ammeter in series to directly measure the current. However, in the application scenario of Mini LED backlight boards, traditional methods have several problems, including but not limited to:

[0027] (1) The Mini LED backlight board has a complex design with numerous LED zones and a complete product circuit design. Conventional testing methods make it difficult to directly connect an ammeter in series to accurately measure the drive current of each single zone. This limitation makes it impossible to accurately determine whether the current of each zone meets the design requirements during the product testing phase, thereby increasing the potential quality risks of the product.

[0028] (2) When the backlight board exhibits abnormal brightness phenomena such as weak brightness in a single area, LED bursting, or LED going out during actual use, the existing troubleshooting methods often require disconnecting the driver chip (RX-IC) from the LED and then connecting an ammeter in series for testing. Although this method can locate the problem area, the process is cumbersome and will inevitably damage the original circuit structure of the backlight board, causing inconvenience to subsequent product analysis and repair work, and may even affect the overall performance and reliability of the product.

[0029] (3) During the manufacturing process, the output current of the driver chip has a certain error range, for example, around ±5%. This error increases significantly when the current is low, leading to uneven brightness distribution across different areas of the backlight panel, severely impacting the product's display effect and user experience. This error problem is particularly prominent in the multi-zone design of Mini LED backlight panels, as each zone has extremely high requirements for current accuracy; any minute current fluctuation can significantly affect the overall display effect. Current solutions aim to improve the output accuracy of the driver chip's drive current and minimize the drive output error. However, this reduces the driver chip's production yield and increases production costs.

[0030] To address at least one of the aforementioned technical problems, this disclosure provides a backlight module, a display module, and an electronic device. Please refer to... Figures 1 to 2 , Figure 1 This is a schematic diagram of the backlight module provided in an embodiment of the present disclosure. Figure 2 for Figure 1 The diagram shows the circuit structure of the driver chip in the backlight board.

[0031] like Figures 1 to 2 As shown, the backlight module includes a backlight board 10 and a drive control board 20.

[0032] The backlight board 10 includes a substrate 110, a driver chip 120 disposed on one side of the substrate 110, and multiple LED partitions 130. The driver chip 120 includes a signal processing module 1210, an LED driver output module 1220, and multiple current detection modules 1230. The LED driver output module 1220 has multiple output ports C. The signal processing module 1210 is connected to the LED driver output module 1220. At least one of the output ports C is connected to one of the LED partitions 130 and one of the current detection modules 1230. The current detection module 1230 is used to detect the output current of the corresponding output port and feed back the current detection result to the signal processing module 1210. The signal processing module 1210 is used to receive current data sent by the driver control board 20, set the output current of each output port of the LED driver output module 1220 according to the current data, and feed back the current detection result to the driver control board 20.

[0033] The backlight board 10 is equipped with a large number of LED beads. To achieve zoned control, the LED beads on the backlight board 10 are zoned, and each zone may include one or more LED beads. When multiple LED beads are included, they are typically connected in series, and each LED bead is die-bonded to the substrate 110. In this embodiment, each zone is referred to as LED zone 130. For ease of illustration, Figure 1 Each LED section 130 is illustrated using only one LED bead.

[0034] Because the backlight board 10 has a large number of LED zones 130, it typically has multiple driver chips 120. Each driver chip 120 includes multiple output ports C, at least one of which is connected to an LED zone 130. Each output port C provides driving current to the connected LED zone 130. In specific implementations, the driver chip 120 is die-bonded to the substrate 110. For example, as shown... Figure 1 As shown, each driver chip 120 includes 8 output ports C, so each driver chip 120 can provide driving current for up to 8 LED partitions 130.

[0035] The signal processing module 1210 inside the driver chip 120 is connected to the LED driver output module 1220 inside the driver chip 120 and the driver control board 20 outside the backlight board 10. It controls the output of the required drive current from each output port C of the LED driver output module 1220 based on the current data sent by the driver control board 20. For any driver chip 120, the received current data includes at least the set current corresponding to each output port C of that driver chip 120, thus enabling the signal processing module 1210 to control the output of the corresponding set current from each output port C of the LED driver output module 1220.

[0036] In this embodiment of the disclosure, the driver chip 120 can be understood as a constant current source, and its LED driver output module 1220 can generate the constant set current required by each output port and provide it to the corresponding LED partition.

[0037] Optionally, the driver chip 120 also includes a data transceiver module 1260, through which the signal processing module 1210 realizes data interaction with the driver control board 20.

[0038] In this embodiment of the present disclosure, in order to realize real-time detection of the driving current at each output port C, a current detection module 1230 is provided at the output port C of the LED driver output module 1220. The current detection module 1230 can detect the driving current output at the corresponding output port C and feed back the current detection result to the signal processing module 1210. After receiving the current detection result, the signal processing module 1210 can feed it back to the external driver control board 20. Thus, the driver control board 20 can obtain the driving current output at each driver port A in real time without damaging the original circuit structure of the backlight board 10, thereby improving the test reliability of the backlight board 10.

[0039] It should be noted that the main improvement of this embodiment lies in the inclusion of a current detection module at the output port. This module enables real-time detection of the drive current output from the output port and feeds it back to the drive control board, thereby achieving current detection for individual LED zones in the backlight board. The specific circuitry of the signal processing module and the LED drive output module in the driver chip can adopt the specific circuit structure of driver chips in related technologies. Furthermore, the current detection module can also be implemented using commonly used current detection circuits in related technologies, and this embodiment does not modify it.

[0040] Compared with related technologies, the backlight module provided in this disclosure embodiment, by setting a current detection module at the output port of the LED driver output module, can detect the actual output drive current of the corresponding output port and feed the current detection result back to the external driver control board, thereby realizing real-time detection of the actual current of each LED zone without damaging the original circuit structure of the backlight board, simplifying the testing process of the backlight board and making it simple and convenient.

[0041] Optional, such as Figure 1 As shown, the drive control board 20 includes a drive control module 210, which is connected to the signal processing module 1210. The drive control module 210 is used to send the current data to the signal processing module 1210, receive the current detection result fed back by the signal processing module 1210, calculate the output error of each output port C according to the current detection result, and adjust the output current of each output port C according to the output error.

[0042] The drive control module 210 is the core of the drive control board 20. It provides current data to each drive chip 120 on the backlight board 10, thereby driving each LED zone 130 to light up according to the corresponding set current. At the same time, the drive control module 210 can also determine the error between the actual current of each LED zone 130 and the set current based on the feedback current detection results of each drive chip 120 (that is, the actual current output by each output port), and adjust the output current of each output port C according to the error.

[0043] The drive control module 210 can be implemented using chips such as a central processing unit (CPU), a microcontroller unit (MCU), or a field-programmable gate array (FPGA). For example,... Figure 1 As shown, the drive control module 210 is a microcontroller unit.

[0044] Optionally, the current data includes the set current of each output port. The step of the drive control module calculating the output error of each output port based on the current detection result and adjusting the output current of each output port based on the output error includes: calculating the difference between the output current of each output port and the set current based on the current detection result and the current data; for at least one output port, when the difference is greater than a preset value, outputting a control signal to the drive chip to reduce the output current of the output port in the drive chip; when the difference is less than the preset value, outputting a control signal to the drive chip to increase the output current of the output port in the drive chip; and when the difference is equal to the preset value, outputting a control signal to the drive chip to maintain the output current of the output port in the drive chip.

[0045] Please refer to Figure 3 , Figure 3 The control logic for the backlight module provided in the embodiments of this disclosure, such as Figure 3 As shown, assuming the difference between the output current and the set current is represented by ΔI, and the preset value is 0, when ΔI is greater than 0, it means that the actual current is greater than the set current, and the drive current output by output port C needs to be reduced; when ΔI is equal to 0, it means that the actual current is equal to the set current, and the drive current output by output port C is maintained; when ΔI is less than 0, it means that the actual current is less than the set current, and the drive current output by output port C needs to be increased. The ultimate goal of this adjustment process is that the actual current of each output port C is the same as the set current.

[0046] In specific implementation, the drive control module 210 outputs a control signal (i.e., a current adjustment signal) to the signal processing module 1210 in the drive chip 120. The control signal includes the current adjustment amount corresponding to each output port C. The signal processing module 1210 adjusts the drive current output by each output port C in the LED drive output module 1210 according to the current adjustment amount so that the actual current of each output port C is the same as the set current.

[0047] The backlight module of this embodiment can adjust the output current of each output port in real time to keep it at a set current. That is, the current of the LED zone corresponding to the output port can be kept at a set current. This can reduce the brightness unevenness caused by the driving output error of the driver chip, improve the production yield of the driver chip, and reduce the production cost.

[0048] In one possible implementation, such as Figure 2 As shown, the driver chip 120 also includes a voltage detection module 1240, which is connected to the LED driver output module 1220 and the signal processing module 1210. The voltage detection module 1240 is used to detect the output voltage of the LED driver output module 1220 and feed back the voltage detection result to the signal processing module 1210. The signal processing module 1210 is used to determine whether there is an overvoltage risk based on the voltage detection result.

[0049] In practical implementation, the signal processing module 1210 can determine whether the detected voltage exceeds a set voltage threshold based on the voltage detection result. If it does, it immediately takes protective measures, such as shutting off the current output at the output port of the LED driver control module 1220 to prevent overvoltage from damaging the driver chip and the LED. It is understandable that the logic for determining the risk of overvoltage can also be implemented by the driver control module 210. In this case, the signal processing module 1210 needs to feed back the voltage detection result to the driver control module 210, which then makes a judgment and feeds back the judgment result to the signal processing module 1210. The signal processing module 1210 then takes protective measures for the LED driver control module 1220.

[0050] It is understood that the voltage detection module 1240 in this embodiment can be implemented using mature circuit structures in related technologies. This embodiment does not limit the specific circuit structure of the voltage detection module 1240, but only adds voltage detection function to the driver chip 120.

[0051] In one possible implementation, such as Figure 2As shown, the driver chip 120 also includes an open / short circuit module 1250, which is connected to the LED driver output module 1220 and the signal processing module 1210. The open / short circuit module 1250 is used to detect whether the output of the LED driver output module 1220 is short-circuited or open-circuited and to feed back the open / short circuit detection result to the signal processing module 1210.

[0052] In this system, after receiving the open / short circuit detection result from the open / short circuit module 1250, the signal processing module 1210 analyzes and judges the result according to a preset algorithm to determine whether a short circuit or other fault exists, and then controls the execution of protection measures. For example, if a short circuit is detected, the signal processing module 1210 can control the output port of the LED driver output module 1220 to stop outputting drive current; if an open circuit is detected, it may trigger an alarm signal. It is understood that the logic for determining whether an open / short circuit exists can also be implemented by the drive control module 210. In this case, the signal processing module 1210 needs to feed back the open / short circuit detection result to the drive control module 210, which then judges the result and feeds it back to the signal processing module 1210, which then takes protection measures for the LED driver control module 1220.

[0053] In this embodiment, the open / short circuit module 1250 can be implemented using a mature circuit structure in related technologies. This embodiment does not limit the specific circuit structure of the open / short circuit module 1250, but only adds open / short circuit functionality to the driver chip 120.

[0054] In one possible implementation, the backlight panel 10 includes at least one driver chip group, which includes multiple driver chips 120 connected sequentially. The input terminal of the first driver chip 120 is connected to the drive control module 210. The first driver chip 120 is used to receive first current data sent by the drive control module 210, read current data corresponding to itself from the first current data, add its own current detection result to the first current data, and then send it to the next driver chip 120. The last driver chip 120 is used to receive the first current data sent by the previous driver chip 120, read current data corresponding to itself from the first current data, add its own current detection result to the first current data, and then feed it back to the drive control module 210.

[0055] In this embodiment, when multiple driver chips 120 are provided on the backlight board 10, the multiple driver chips 120 can be grouped to obtain multiple driver chip groups, and each driver chip group can include multiple driver chips 120. For any driver chip group, the driver chips within it are cascaded. The first current data sent by the drive control module 210 is first transmitted to the first driver chip (i.e., the first driver chip). After the signal processing module 1210 of the first driver chip reads the current data corresponding to itself from the first current data, it controls its own LED drive output module 1220 to set the drive current of each output port C to the set current. At the same time, the signal processing module 1210 also obtains the current detection result of the output port C fed back by the current detection module 1230 of each output port C, and adds the current detection result to the first current data. Then, the first current data with the added current detection result is sent to the second driver chip. After receiving the first current data from the first driver chip, the second driver chip performs the same processing until the first current data with the added current detection result is sent to the last driver chip (i.e., the end driver chip). After receiving the first current data from the previous driver chip, the end driver chip, in addition to performing the above processing, will also feed back the final first current data with the current detection result to the drive control module 210. In this way, the drive control module 210 can obtain the actual current of each output port of each driver chip in the drive chip group.

[0056] Specifically, the first current data sent by the drive control module 210 to the drive chipset includes at least the set current of each output port of each drive chip within the drive chipset. In a specific implementation, each set current in the first current data needs to have a position identifier, which can represent the output port corresponding to that set current. For example, this position identifier can be composed of a drive chip identifier ID1 and an output port identifier ID2, where ID1 can be represented by A... i This indicates that ID2 can be generated by C. j For example, a driver chipset may contain 6 driver chips, with corresponding driver chip identifiers ID1 being A1, A2, A3, A4, A5, and A6. Each driver chip includes 8 output ports, with each output port identifier ID2 being C1, C2, C3, C4, C5, C6, C7, and C8. Then, for any given set current, its position identifier can be represented as A... i C j A i C j Indicates the i-th driver chip A i The j-th output port C jThe set current. For example, if the position identifier of a certain set current is A1C2, it means that the set current is the set current of the output port C2 in the driver chip A1. It can be understood that the first current data fed back to the drive control module 210 by the end driver chip also includes the position identifier as shown above, which is used to indicate the output port corresponding to the current detection result.

[0057] For example, please refer to Figure 1 , Figure 1 Each driver chip 130 in the backlight board 10 includes 8 output ports. Each driver chip 130 is used to provide driving current to the 8 LED sections 130 above and below it. The driver chips 120 corresponding to every two columns of LED sections 130 in the backlight board 10 constitute a driver chip group. The drive control module 210 includes an output port for outputting first current data Data to the first driver chip in the driver chip group. At the same time, the drive control module 210 also includes an input port for receiving the first current data with current detection results fed back by the end driver chip.

[0058] In one possible implementation, the signal processing module 1210 feeds back the current detection result to the drive control module 210 via serial communication.

[0059] In this embodiment of the disclosure, the signal processing module 1210 can also be understood as the signal processing module 1210 of the end driver chip. Serial communication has many advantages in communication between the signal processing module 1210 and the drive control module 210, such as simplicity, stability, low cost, compatibility, and strong real-time performance.

[0060] In one possible implementation, the signal processing module is further configured to convert the current detection result into a digital signal and feed the converted current detection result back to the drive control board.

[0061] In this embodiment, after the signal processing module 1210 obtains the current detection result fed back by the current detection module 1220, it converts the current detection result into a digital signal, which is then fed back to the drive control module 210 on the drive control board 20. The principle of converting the current detection result into a digital signal is shown in Table 1. For example, if the current detection result of a certain output port is 0.001mA, the resulting hexadecimal digital signal after conversion is represented as 0001.

[0062] Table 1 Mapping Table of Current Detection Results and Digital Signal

[0063] Output current Iout (mA) Current range Convert to corresponding hexadecimal data 0 0≤I≤0.001 0000 0.001 0.001＜I≤0.002 0001 0.002 0.002＜I≤0.003 0002 0.003 0.003＜I≤0.004 0003 … … …

[0064] In one possible implementation, the backlight module further includes at least one adapter circuit board 30, which is connected to at least one of the driving chipsets. The adapter circuit board 30 is used to transmit the first current data sent by the driving control module 210 to the first driving chip 120 in the driving chipset and to transmit the first current data fed back by the end driving chip 120 in the driving chipset to the driving control module 210.

[0065] Optionally, the adapter circuit board 30 is made of flexible printed circuit (FPC) or chip on film (COF), and the driver circuit board 20 and the backlight board 10 can be connected together through the adapter circuit board 30.

[0066] The number of adapter circuit boards 30 is related to the number of driver chipsets on the backlight board 10. The more driver chipsets there are, the more adapter circuit boards 30 are usually required. In general, one adapter circuit board 30 can provide current data for multiple driver chipsets. At this time, the adapter circuit board 30 can include multiple sets of interfaces, and each set of interfaces can realize data interaction between the drive control module 210 and one driver chipset.

[0067] Optionally, the drive control board 20 is further provided with a power supply circuit 220, which is used to provide operating voltage to the drive chip 120 and LED partition 130 on the backlight board 10.

[0068] For example, such as Figure 1 As shown, the power supply circuit 220 includes a power connector, a Buck circuit, and a DC-DC circuit. The power connector is connected to the external ground signal GND, the first power signal VLED, and the second power signal VCC. The second power signal VCC is input to the Buck circuit to generate the voltage signal VCC required for the driver chip to operate. RX-IC The voltage signal VCC RX-IC This is used to ensure the driver chip functions normally; simultaneously, the second power signal VCC, after being input into the DC-DC circuit, generates the voltage signal required for the drive control module 210 to operate. The first power signal VLED and the voltage signal VCC... RX-IC The ground signal GND is supplied to the backlight board 10 after passing through the adapter circuit board 30. The first power signal VLED is connected to the first pole of each LED section 130, and the voltage signal VCC... RX-IC It is connected to the voltage input pin of each driver chip, and the ground signal GND is connected to the ground pin of each driver chip.

[0069] In addition, the drive control board 20 can also be equipped with an SPI connector and a programming connector. The SPI connector is used to realize SPI communication between the drive control module 210 and external devices, and the programming connector is used to realize the connection between the drive control module 210 and external programming devices, so that external devices can program or data into the drive control module 210.

[0070] Based on the same inventive concept, a second aspect of this disclosure provides a display module, including the backlight module as described above.

[0071] Since the aforementioned backlight module can detect the actual current of each LED zone in the backlight board in real time, it can solve the problems of cumbersome testing and damage to the original circuitry of the backlight board during testing. Furthermore, through the real-time current adjustment function, it can solve the problem of uneven brightness caused by excessive output current error of the driver chip, thereby improving the production yield of the driver chip. The display module of this disclosure embodiment includes the aforementioned backlight module, and therefore the display module of this disclosure embodiment also has the above advantages.

[0072] Based on the same inventive concept, a third aspect of this disclosure provides an electronic device including the display module described above. Exemplarily, this electronic device can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator; this embodiment does not limit this to any particular type.

[0073] Obviously, the above embodiments of this disclosure are merely examples for clearly illustrating this disclosure, and are not intended to limit the implementation of this disclosure. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all implementation methods here. Any obvious variations or modifications derived from the technical solutions of this disclosure are still within the protection scope of this disclosure.

Claims

1. A backlight module, characterized in that, The system includes a backlight board, which comprises a substrate, a driver chip disposed on one side of the substrate, and multiple LED zones. The driver chip includes a signal processing module, an LED driver output module, and multiple current detection modules. The LED driver output module has multiple output ports. The signal processing module is connected to the LED driver output module. At least one of the output ports is connected to one of the LED zones and one of the current detection modules. The current detection module is used to detect the output current of the corresponding output port and feed back the current detection result to the signal processing module. The signal processing module is used to receive current data sent by the driver control board, set the output current of each output port of the LED driver output module according to the current data, and feed back the current detection result to the driver control board.

2. The backlight module according to claim 1, characterized in that, The backlight module further includes the driving control board, which includes a driving control module connected to the signal processing module. The driving control module is used to send the current data to the signal processing module, receive the current detection result fed back by the signal processing module, calculate the output error of each output port based on the current detection result, and adjust the output current of each output port based on the output error.

3. The backlight module according to claim 2, characterized in that, The current data includes the set current of each output port. The step of the drive control module calculating the output error of each output port based on the current detection result and adjusting the output current of each output port based on the output error includes: calculating the difference between the output current of each output port and the set current based on the current detection result and the current data; for at least one output port, when the difference is greater than a preset value, outputting a control signal to the drive chip to reduce the output current of the output port in the drive chip; when the difference is less than the preset value, outputting a control signal to the drive chip to increase the output current of the output port in the drive chip; and when the difference is equal to the preset value, outputting a control signal to the drive chip to maintain the output current of the output port in the drive chip.

4. The backlight module according to claim 1, characterized in that, The driver chip also includes a voltage detection module, which is connected to the LED driver output module and the signal processing module. The voltage detection module is used to detect the output voltage of the LED driver output module and feed back the voltage detection result to the signal processing module. The signal processing module is used to determine whether there is an overvoltage risk based on the voltage detection result.

5. The backlight module according to claim 1, characterized in that, The driver chip also includes an open / short circuit module, which is connected to the LED driver output module and the signal processing module. The open / short circuit module is used to detect whether the output of the LED driver output module is short-circuited or open-circuited and to feed back the open / short circuit detection result to the signal processing module.

6. The backlight module according to claim 2, characterized in that, The backlight panel includes at least one driver chip group, which includes multiple driver chips connected in sequence. The input terminal of the first driver chip is connected to the drive control module. The first driver chip is used to receive first current data sent by the drive control module, read the current data corresponding to itself from the first current data, add its own current detection result to the first current data, and then send it to the next driver chip. The last driver chip is used to receive the first current data sent by the previous driver chip, read the current data corresponding to itself from the first current data, add its own current detection result to the first current data, and then feed it back to the drive control module.

7. The backlight module according to claim 6, characterized in that, The signal processing module feeds back the current detection result to the drive control module via serial communication.

8. The backlight module according to claim 6, characterized in that, The backlight module further includes at least one adapter circuit board, which is connected to at least one of the driver chipsets. The adapter circuit board is used to transmit the first current data sent by the driver control module to the first driver chip in the driver chipset and to transmit the first current data fed back by the end driver chip in the driver chipset to the driver control module.

9. The backlight module according to claim 2, characterized in that, The drive control board is also equipped with a power supply circuit, which is used to provide operating voltage to the driver chip and LED partitions on the backlight board.

10. The backlight module according to claim 1, characterized in that, The signal processing module is also used to convert the current detection result into a digital signal and feed the converted current detection result back to the drive control board.

11. A display module, characterized in that, Includes the backlight module as described in any one of claims 1 to 10.

12. An electronic device, characterized in that, Includes the display module as described in claim 11.

Images