LED display module, fault detection system and LED display screen

Abstract

The utility model provides a kind of LED display module, fault detection system and LED display screen, and LED display module is equipped with display control signal interface and correction control signal interface, and LED display module includes: display control signal acquisition module and the display driving chip connected with display control signal acquisition module;Display control signal acquisition module is connected scanning card by display control signal interface and correction control signal interface;The utility model is by the setting of correction control signal interface, in the case where not additional MCU, the fault detection of LED display module is realized, and the cost of LED display module is reduced.

Description

Technical Field

[0001] This utility model relates to the field of LED display technology, and in particular to an LED display module, a fault detection system and an LED display screen. Background Technology

[0002] LED displays typically consist of a scanning card and multiple display modules. The scanning card transmits display control timing signals to the display modules via control signal lines, thereby driving the display chips within the modules to illuminate the LEDs and display images.

[0003] A common fault detection method is an automatic testing system for LED modules, published in CN117746757B. This system uses an additional microprocessor (MCU) to sample the timing of control signals and analyzes the sampling results to determine whether the module has a fault.

[0004] However, this technical solution has the following shortcomings:

[0005] 1. Each module requires an additional MCU, increasing system cost;

[0006] 2. Low-cost MCUs have a limited number of pins, which cannot cover all control signals and result in detection blind spots;

[0007] 3. The MCU's sampling frequency is too low to detect display timing at the MHz level in real time;

[0008] 4. The detection operation requires interruption of normal display and is only applicable to power-on or manual operation scenarios; real-time online detection is not possible.

[0009] 5. This solution can only detect whether there are high or low level changes in the signal, and determines whether it is abnormal or normal by simply whether it is always 1 or 0. Utility Model Content

[0010] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide an LED display module, a fault detection system and an LED display screen, so as to solve the problem that the prior art requires additional configuration of MCU, thereby increasing the system cost.

[0011] To address the aforementioned technical problems, this utility model provides an LED display module connected to a scanning card. The LED display module includes a display control signal interface and a correction control signal interface. The LED display module comprises a display control signal acquisition module and a display driver chip. The display control signal acquisition module is connected to the scanning card via the display control signal interface and the correction control signal interface. The display control signal interface is also connected to the input terminal of the display driver chip. The display control signal acquisition module is also connected to the output terminal of the display driver chip. The display driver chip receives display control signals from the scanning card via the display control signal interface. The display control signal acquisition module receives display control signals from the scanning card via the display control signal interface and receives correction signals from the scanning card via the correction control signal interface. The display control signal acquisition module also sends actual display control signals to the scanning card via the correction control signal interface.

[0012] In one embodiment of this utility model, the display control signal acquisition module includes: an analog gating chip and a serial input parallel output chip; wherein, the input terminal of the analog gating chip is connected to the display control signal interface and the output terminal of the display driver chip respectively; the input terminal of the serial input parallel output chip is connected to the correction control signal interface; the selection control terminal of the analog gating chip is connected to the output terminal of the serial input parallel output chip; and the correction control signal interface is also connected to the enable terminal and the output terminal of the analog gating chip respectively.

[0013] In one embodiment of this utility model, the display control signal includes a DCLK signal, an LA signal, a GCK signal, and an SDI signal.

[0014] In one embodiment of the present invention, the input terminal of the display driver chip receives DCLK signal, LA signal, GCK signal and SDI signal from the scan card through the display control signal interface; the input terminal of the analog gating chip receives DCLK signal, LA signal and GCK signal from the scan card through the display control signal interface.

[0015] In one embodiment of the present invention, the correction control signal includes: a CS signal, a CLK signal, and a MOSI signal.

[0016] In one embodiment of the present invention, the input terminal of the serial input parallel output chip receives the CLK signal and the MOSI signal through the correction control signal interface; the enable terminal of the analog gating chip receives the CS signal through the correction control signal interface.

[0017] In one embodiment of this utility model, the number of input terminals of the display control signal acquisition module is related to the number of bits of the SDO signal.

[0018] This utility model also provides a fault detection system for LED display modules, including one or more LED display modules as described above and scanning cards connected to each LED display module respectively; wherein, the scanning card is provided with a processor; the processor is used to receive actual display control signals.

[0019] In one embodiment of this utility model, the processor is a MHz-level processor.

[0020] This utility model also provides an LED display screen, including the fault detection system for the LED display module as described above.

[0021] As described above, the LED display module, fault detection system, and LED display screen of this utility model have the following beneficial effects:

[0022] This invention achieves fault detection of LED display modules without adding an additional MCU by correcting the settings of the control signal interface, thereby reducing the cost of LED display modules. Attached Figure Description

[0023] Figure 1 The diagram shown is a schematic block diagram of the LED display module of this utility model;

[0024] Figure 2 The diagram shown is a schematic representation of the specific structure of the LED display module of this utility model.

[0025] Figure 3 The diagram shown is a timing diagram of the SDI signal according to a specific embodiment of the present invention. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0027] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "holding" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, operation, element, component, item, kind, and / or group, but do not preclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition arise only when combinations of elements, functions, or operations are inherently mutually exclusive in some manner.

[0030] like Figure 1 As shown, this utility model provides an LED display module. The LED display module 1 is connected to a scanning card 2, and the LED display module 1 is provided with a display control signal interface 11 and a correction control signal interface 12. The LED display module 1 includes:

[0031] The display control signal acquisition module 13 and the display driver chip 14 are displayed; wherein, the display control signal acquisition module 13 is connected to the scanning card 2 through the display control signal interface 11 and the correction control signal interface 12; the display control signal interface 11 is also connected to the input terminal of the display driver chip 14; the display control signal acquisition module 13 is also connected to the output terminal of the display driver chip 14.

[0032] The display driver chip 14 receives the display control signal from the scanning card 2 through the display control signal interface 11; the display control signal acquisition module 13 receives the display control signal from the scanning card 2 through the display control signal interface 11, and receives the correction signal from the scanning card 2 through the correction control signal interface 12; the display control signal acquisition module 13 also sends the actual display control signal to the scanning card 2 through the correction control signal interface 12.

[0033] In one embodiment, such as Figure 2 As shown, the display control signal acquisition module includes: an analog gating chip and a serial input parallel output chip;

[0034] The analog gating chip's input terminals (X1-XN) are connected to the display control signal interface and the display driver chip's output terminal; the serial input parallel output chip's input terminal is connected to the correction control signal interface; the analog gating chip's selection control terminal (sel) is connected to the serial input parallel output chip's output terminal; and the correction control signal interface is also connected to the analog gating chip's enable terminal (en) and output terminal (out).

[0035] It should be understood that a Serial-In Parallel-Out (SIPO) chip is a sequential logic device whose core function is to convert a serial data stream (transmitted bit by bit) into a parallel data stream (transmitted multiple bits simultaneously). A suitable SIPO chip can be selected based on actual needs, and this invention does not impose any limitations on this selection.

[0036] In one specific embodiment, the analog gating chip is a 74HC4051 chip, and the serial input parallel output chip is a 74HC164 chip.

[0037] In one embodiment, the display control signals include a DCLK signal, an LA signal, a GCK signal, and an SDI signal. The DCLK signal is a clock signal. SDI is an abbreviation for Serial Digital Interface, an interface standard used to transmit digital component video signals. The LA signal typically refers to the Line Address Signal, used to control the line scanning of the LED display. The GCK signal is a shift clock signal, a key clock signal in LED displays used to control the line scanning order and timing.

[0038] Furthermore, such as Figure 2 As shown, the input terminal of the display driver chip receives the DCLK, LA, GCK, and SDI signals from the scan card via the display control signal interface; the input terminal of the analog gating chip receives the DCLK, LA, and GCK signals from the scan card via the display control signal interface. The input terminal of the analog gating chip also receives the SDO signal from the input terminal of the display driver chip.

[0039] Specifically, the display driver chip receives N-3 bits of SDI signals as input and outputs N-3 bits of SDO signals. The analog gating chip's input terminal X1 receives the DCLK signal, input terminal X2 connects to the LA signal, input terminal X3 connects to the GCK signal, input terminal X4 connects to SDO signal 1, input terminal X5 connects to SDO signal 2, input terminal X6 connects to SDO signal 3, ..., and input terminal N connects to SDO signal N-3. It can be seen that the number of input terminals of the analog gating chip depends on the number of bits in the SDO signal. The number of input terminals of the analog gating chip is equal to the number of bits in the SDO signal plus 3.

[0040] In one embodiment, the correction control signals include: a CS signal, a CLK signal, and a MOSI signal. The CS, CLK, and MOSI signals are all signals under the SPI protocol. It should be understood that the CS (Chip Select) signal is the chip select signal. The CLK (Serial Clock) signal is the serial clock signal. The MOSI (Master Out Slave In) signal is the master out / slave in signal. The MISO (Master In Slave Out) signal is the master in / slave out signal.

[0041] Furthermore, such as Figure 2 As shown, the input terminal of the serial input parallel output chip receives the CLK signal and the MOSI signal; the enable terminal of the analog gating chip receives the CS signal. The output terminal of the analog gating chip sends the actual display control signal to the scan card in the form of a SPIMISO signal through the correction control signal interface.

[0042] The following section will explain the specific principles by which the display control signal acquisition module acquires the actual display control signals from the display driver chip:

[0043] When the CS signal is high, it enables the analog gating chip to start working. The CLK and MOSI signals, through a serial input / parallel output chip, select the channels of the analog gating chip, causing the chip to output signals for the selected channels respectively. The analog gating chip's input is the SDO signal, and its output is the MOSI signal.

[0044] To better illustrate the principle of the display control signal acquisition module acquiring the actual display control signal of the display driver chip, a specific embodiment is provided.

[0045] Example 1: A method for acquiring actual display control signals.

[0046] The analog gating chip has input X1 receiving the DCLK signal, input X2 connected to the LA signal, input X3 connected to the GCK signal, input X4 connected to SDO signal 1, input X5 connected to SDO signal 2, and input X6 connected to SDO signal 3.

[0047] When the selection control terminal sel[3:0] of the analog gating chip is set to "0000", the output terminal OUT of the analog gating chip is connected to the input terminal X1; when sel[3:0] is set to "0001", the output terminal OUT of the analog gating chip is connected to the input terminal X2; when sel[3:0] is set to "0010", the output terminal OUT of the analog gating chip is connected to the input terminal X3; when sel[3:0] is set to "0011", the output terminal OUT of the analog gating chip is connected to the input terminal X4; when sel[3:0] is set to "0011", the output terminal OUT of the analog gating chip is connected to the input terminal X4; when sel[3:0] is set to "0100", the output terminal OUT of the analog gating chip is connected to the input terminal X5; when sel[3:0] is set to "0101", the output terminal OUT of the analog gating chip is connected to the input terminal X6. Therefore, when sel[3:0] is "0011", the signal output by the output terminal of the analog gating chip is the SDO signal 1. When sel[3:0] is selected as “0011”, the output signal of the analog gating chip is SDO signal 2; when sel[3:0] is selected as “0100”, the output signal of the analog gating chip is SDO signal 3.

[0048] Similar to the above embodiments, this utility model also provides a fault detection system for LED display modules, including one or more LED display modules as described above and scanning cards connected to each LED display module respectively; wherein, the scanning card is provided with a processor; the processor is used to receive actual display control signals.

[0049] It should be noted that the specific structure of the LED display module has been described in the above embodiments and will not be repeated here.

[0050] The following section describes the specific process of using a scanning card to detect faults in an LED display module:

[0051] When the scanning card performs a test, the CS signal is set high, enabling the analog gating chip. The CLK and MOSI signals output serial timing signals, writing the corresponding serial data to the serial input / parallel output chip, which then outputs the corresponding parallel data. The output of the serial input / parallel output chip is connected to the selection control terminal of the analog gating chip. The selection control terminal of the analog gating chip selects the corresponding analog gating signal input Xi based on the received parallel data; where i is any integer from 4 to N. X4 to XN are the SDO signals. The output of the analog gating chip sends the corresponding SDO signal to the scanning card through the correction control signal interface. The scanning card performs an XOR operation on the received SDO signal and the corresponding output SDI signal. When the resulting discrimination signal is 1, it indicates that a fault exists at that moment.

[0052] It should be understood that the SDI signal output by the scan card is a data signal, which, together with the dclk signal, writes data into the driver chip. If the SDI signal level is incorrect, it will cause display abnormalities. Poor contact in the module connector or a short circuit with other signals can cause the SDI1 signal to have an incorrect level for a certain period. The scan card can receive all returned control signals from the display module. By comparing the returned control signals with the control signals output by the scan card, it can determine whether the control signals on the display module are normal, thus achieving the detection and location of all control signals, including defective pixel detection.

[0053] For example, such as Figure 3As shown, the CLK and MOSI signals output serial timing, writing the corresponding serial data "0011" to the serial input parallel output chip. The 4-bit output of the serial input parallel output chip is connected to the selection control terminal sel[3:0] of the analog gating chip. Therefore, sel[3:0] is "0011". At this time, the output terminal OUT of the analog gating chip outputs the SDO signal 1 of the input terminal X4 of the analog gating chip. The scan card receives the SDO signal 1 through the correction control signal interface. The SDO signal 1 is the SDI signal 1. The scan card performs XOR processing on the received SDI signal 1 and the SDI signal 1 output by the scan card. When the resulting discrimination signal is 1, it indicates that there is a fault at this moment.

[0054] In one embodiment, the processor on the scan card is a MHz-level processor. It should be understood that a MHz-level processor refers to a type of processor with a clock speed around several hundred MHz, typically not exceeding 1 GHz. MHz-level processors support high-frequency sampling, enabling accurate fault diagnosis.

[0055] It should be noted that the fault detection system for LED display modules of this invention, based on the existing structure of LED display modules, achieves fault detection of LED display modules by improving the signal lines and circuit structure without changing the interface definitions. This invention eliminates the need for an additional MCU, reducing the cost of the LED module. Furthermore, this invention can perform fault detection on the LED display module while it is operating, even without requiring normal terminal display. It offers high real-time performance, allowing for immediate fault detection and feedback, thus improving maintenance efficiency.

[0056] Similar to the embodiments described above, this utility model also provides an LED display screen, including a fault detection system for the LED display module as described above. It should be noted that the fault detection system has already been described in the above embodiments and will not be repeated here.

[0057] In summary, this invention provides an LED display module, a fault detection system, and an LED display screen. The LED display module is equipped with a display control signal interface and a correction control signal interface. The LED display module includes a display control signal acquisition module and a display driver chip connected to the display control signal acquisition module. The display control signal acquisition module is connected to a scanning card through the display control signal interface and the correction control signal interface. This invention, through the setting of the correction control signal interface, achieves fault detection of the LED display module without adding an additional MCU, thus reducing the cost of the LED display module. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0058] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An LED display module, wherein the LED display module is connected to a scanning card, characterized in that, The LED display module is provided with a display control signal interface and a correction control signal interface. The LED display module includes: The system includes a display control signal acquisition module and a display driver chip; wherein the display control signal acquisition module is connected to the scanning card through the display control signal interface and the correction control signal interface; the display control signal interface is also connected to the input terminal of the display driver chip; and the display control signal acquisition module is also connected to the output terminal of the display driver chip. The display driver chip receives display control signals from the scanning card through the display control signal interface; the display control signal acquisition module receives display control signals from the scanning card through the display control signal interface, and receives correction signals from the scanning card through the correction control signal interface; the display control signal acquisition module also sends actual display control signals to the scanning card through the correction control signal interface.

2. The LED display module according to claim 1, characterized in that, The display control signal acquisition module includes: an analog gating chip and a serial input parallel output chip; The analog gating chip's input terminal is connected to both the display control signal interface and the display driver chip's output terminal; the serial input parallel output chip's input terminal is connected to the correction control signal interface; the analog gating chip's selection control terminal is connected to the serial input parallel output chip's output terminal; and the correction control signal interface is also connected to both the analog gating chip's enable terminal and output terminal.

3. The LED display module according to claim 2, characterized in that, The display control signals include DCLK signal, LA signal, GCK signal and SDI signal.

4. The LED display module according to claim 3, characterized in that, The input terminal of the display driver chip receives the DCLK signal, LA signal, GCK signal and SDI signal from the scan card through the display control signal interface; the input terminal of the analog gating chip receives the DCLK signal, LA signal and GCK signal from the scan card through the display control signal interface.

5. The LED display module according to claim 2, characterized in that, The correction control signals include: CS signal, CLK signal and MOSI signal.

6. The LED display module according to claim 5, characterized in that, The input terminal of the serial input parallel output chip receives the CLK signal and the MOSI signal through the correction control signal interface; the enable terminal of the analog gating chip receives the CS signal through the correction control signal interface.

7. The LED display module according to claim 4, characterized in that, The number of input terminals of the display control signal acquisition module is related to the number of bits of the SDO signal.

8. A fault detection system for an LED display module, characterized in that, It includes one or more LED display modules as described in any one of claims 1 to 7 and scanning cards respectively connected to each LED display module; wherein, the scanning card is provided with a processor; the processor is used to receive actual display control signals.

9. The fault detection system for an LED display module according to claim 8, characterized in that, The processor is a MHz-level processor.

10. An LED display screen, characterized in that, Including the fault detection system for LED display modules as described in claim 8 or 9.

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