CN106324420A - Display fault detection method - Google Patents

Abstract

The invention discloses a display fault detection method, comprising: pre-store the same detection data sequence on the main board end and the display screen end, the detection data sequence includes detection data for several times of detection; the main board end follows the detection order Sending the detection data to the display screen end for the display screen end to receive data through wiring, and comparing the data with the detection data pre-stored on the display screen end to obtain a comparison result; the main board The terminal receives the response message returned by the display screen terminal, and records the reply time of receiving the response message; the response message contains the comparison result; whether the main board terminal receives the response message according to the several detections , the recovery time and the comparison result, the diagnosis shows the type of the fault. The technical scheme of the invention can automatically detect after power-on, reduce labor costs and improve test efficiency.

Description

A display fault detection method

technical field

The invention relates to the technical field of on-vehicle electronic testing, in particular to a display fault detection method.

Background technique

Cables, also known as flexible circuit boards, use different rules in different industries to define line sequence, line color, line number, etc., for data transmission between modules. A typical application scenario of the cable is to be connected between the main board and the display screen of the vehicle electronic system for protocol communication and display data transmission between the main board and the display screen. Other application scenarios also include connection between mobile terminals such as mobile phone motherboards and display screens, and computer motherboards and hard disks.

In the vehicle-mounted electronic system or mobile terminal in the traditional technology, the crimping work of the cable terminal may be done manually, and there is a chance of cable breakage, cable connection error (such as misalignment), and cable terminal poor contact during the production process. In addition, there are some problems due to the aging of the display itself, which will lead to display failures, such as blue screen, black screen, no display, and display errors.

In the process of product production, it is necessary to test the display failure and check the possible causes of the failure. In the traditional technology, the test is still done manually. As mentioned above, the cause of the display failure is more complicated. It may be a problem on the display screen, a problem on the motherboard, or a problem with the cable. Here we only check the problem of the cable. For example, tools (mainly oscilloscopes) are generally used to determine whether there is a problem with the cable connection by checking whether the data sent and received by the main board and the display are consistent, which requires a lot of manpower and the test efficiency is not high.

Contents of the invention

Based on this, it is necessary to provide a display fault detection method, which can automatically detect after power-on, reduce labor costs and improve test efficiency.

A display fault detection method, the method comprising:

Pre-store the same detection data sequence on the main board side and the display screen side, the detection data sequence includes detection data for several times of detection;

The main board side sends the detection data to the display screen according to the detection order, so that the display screen can receive data through wiring, and compare the data with the detection data pre-stored on the display screen Get the comparison result;

The main board side receives the reply message returned by the display screen side, and records the reply time of receiving the reply message; the reply message includes the comparison result;

The motherboard side diagnoses and displays the type of fault according to whether a response message is received, the reply time, and the comparison result in the several times of detection; the type of the displayed fault includes: cable disconnection, abnormal display, Wrong connection, poor contact of cable terminal, normal connection of cable.

Further, the motherboard side diagnoses and displays the type of fault according to whether a response message is received, the reply time, and the comparison result in the several detections, including:

In the several times of detection, if the main board does not receive a response message within the preset time interval (0, 5T), the diagnosis shows that the type of the fault is an open circuit of the cable.

Further, the motherboard side diagnoses and displays the type of fault according to whether a response message is received, the reply time, and the comparison result in the several detections, including:

In the several detections, if the recovery time is all within the preset time interval (T, 5T), the diagnosis shows that the type of the fault is an abnormality of the display screen.

Further, the motherboard side diagnoses and displays the type of fault according to whether a response message is received, the reply time, and the comparison result in the several detections, including:

In the several times of detection, if the recovery times are all within the preset time interval (0, T), and the comparison results are inconsistent, the diagnosis shows that the type of the fault is a cable connection error.

Further, the motherboard side diagnoses and displays the type of fault according to whether a response message is received, the reply time, and the comparison result in the several detections, including:

In the several times of detection, if the recovery time is within the preset time interval (0, T), and the comparison results of several times include both the comparison consistency and the comparison inconsistency, then the diagnosis shows that the type of the fault is wiring Terminal contact is bad.

Further, the motherboard side diagnoses and displays the type of fault according to whether a response message is received, the reply time, and the comparison result in the several detections, including:

In the several detections, if the recovery time is within the preset time interval (0, T), and the comparison results of several times are consistent, it is confirmed that the connection of the cable is normal.

Further, the motherboard side diagnoses and displays the type of fault according to whether a response message is received, the reply time, and the comparison result in the several detections, including:

In the several times of detection, if the detection result of whether the main board receives the response message is inconsistent, or the response time is not between the preset time intervals (0, T) or (T, 5T), then First determine the temporary display fault type corresponding to each detection, and then establish the highest priority temporary display fault type as the final detected display fault type.

Further, the priority order of the temporarily displayed fault types is:

Poor contact of cable terminal > wrong connection of cable > abnormal display > broken circuit of cable > normal connection of cable.

Further, T=100ms.

Further, the method further includes: the main board terminal prompts the user with an audible or optical signal according to the type of the displayed fault.

The above-mentioned display fault detection method stores the same detection data sequence on the main board side and the display screen side in advance, and performs several detections through the main board side and the display screen side, and transmits the detection data between them and compares them with the pre-stored data. Whether a response message is received for the first inspection, the reply time, and the comparison results, and the diagnosis shows the type of fault. Compared with the traditional technology that relies on manual detection, it reduces labor costs and improves detection efficiency.

Description of drawings

Fig. 1 is a schematic flow chart of a display fault detection method in an embodiment;

FIG. 2 is a block diagram showing an application scenario of a fault detection method in an embodiment;

Fig. 3 is a schematic diagram of a detection process of a display fault detection method in an embodiment.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to Fig. 1, a method for displaying fault detection is provided in one embodiment, the method includes:

Step 101, pre-store the same detection data sequence on the main board side and the display screen side, and the detection data sequence includes detection data for several times of detection.

Step 102 , the main board sends detection data to the display screen according to the detection sequence, so that the display screen can receive the data through wiring, and compares the data with the pre-stored detection data on the display screen to obtain a comparison result.

Step 103, the main board side receives the reply message returned by the display screen side, and records the reply time of receiving the reply message; the reply message includes the comparison result.

Step 104 , the motherboard side diagnoses and displays the type of the fault according to whether a reply message is received, the reply time, and the comparison result for several times of detection. The types of displayed faults include: open circuit of the cable, abnormal display screen, wrong connection of the cable, poor contact of the terminal of the cable, and normal connection of the cable.

More specifically, the detection situation may be as follows:

In several tests, if the main board does not receive a response message within the preset time interval (0, 5T), the diagnosis shows that the type of fault is a cable break;

In several tests, if the recovery time is within the preset time interval (T, 5T), then the diagnosis shows that the fault type is abnormal display screen;

In several tests, if the recovery time is within the preset time interval (0, T), and the comparison results are inconsistent, the diagnosis shows that the type of fault is a cable connection error;

In several tests, if the recovery time is within the preset time interval (0, T), and the comparison results of several times include both the comparison consistency and the comparison inconsistency, the diagnosis shows that the type of fault is poor contact of the cable terminal;

In the several times of detection, if the recovery time is all within the preset time interval (0, T), and the comparison results of several times are consistent, it is confirmed that the cable connection is normal;

In several detections, if the detection result of whether the main board receives the response message is inconsistent, or the response time is different and is between the preset time interval (0, T) or (T, 5T), first determine the corresponding The type of temporary display faults, and then establish the type of temporary display faults with the highest priority as the type of display faults finally detected. The order of priority of temporary display fault types is: Poor connection of cable terminals > Wrong connection of cable > Abnormal display screen > Open circuit of cable > Normal connection of cable.

In this embodiment, T=100ms.

Optionally, after the main board end of the method diagnoses the type of the displayed fault, the method further includes: the main board end prompts the user with an audible or optical signal according to the type of the displayed fault.

The above-mentioned display fault detection method stores the same detection data sequence on the main board side and the display screen side in advance, and performs several detections through the main board side and the display screen side, and transmits the detection data between them and compares them with the pre-stored data. Whether a response message is received for the first inspection, the reply time, and the comparison results, and the diagnosis shows the type of fault. Compared with the traditional technology that relies on manual detection, it reduces labor costs and improves detection efficiency.

Referring to Fig. 2 and Fig. 3, it is an application scenario of the embodiment of the present invention. Specifically, in the system shown in FIG. 2 , the hardware device on the motherboard side includes a main controller and a prompt module. The display screen end is specifically the display module in Fig. 2, which includes a communication module. The prompt module is connected with the main controller through channel 3 (I2S), and its main function is to reflect the connection status between the main controller and the display module. The main controller is connected with the display module through a cable. The display module contains a communication module, the main function of which is to communicate with the main controller to transmit response messages and comparison results. The cable mainly includes: communication protocol transmission channel (I2C, SPI, UART and other common communication protocols), that is, the main controller sends data, the display module receives data channel 1, the main controller receives data, the display module sends data channel 2, Data transmission Channel 4, Power supply channel 5.

Fig. 3 is a detection logic diagram corresponding to the system in Fig. 2, and the detection mechanism is realized through the communication between the main controller and the communication module.

After being powered on and starting to work, the main controller will send data A, B, and C with a specific sequence agreed by both parties to the communication module in the display module through channel 1 (at least two detections are required, and three detections are taken as an example in this embodiment) ), within 5T (T=100ms), if the communication module in the display module does not reply to the main controller through channel 2, then the main controller will think that the cable is not connected and will send the above-mentioned specific sequence of data again, If no reply from the communication module is received for three consecutive times, the main controller will send an instruction to the prompt module through channel 3 to make it sound an alarm: the cable is broken;

If the main controller receives the reply from the communication module within 5T, it will continue to judge whether the received time is within T. If it is not within T, the main controller will think that the screen is abnormal (the screen is damaged) and will send the above-mentioned specific sequence of data again. If the reply time of the communication module is received three times in a row is greater than T, the main controller will pass the channel 3 Send an instruction to the prompt module to make it sound an alarm: the display screen is abnormal;

If the main controller receives the reply from the communication module within T time, it will continue to judge whether the received specific sequence data is correct. If it is correct, then the main controller will think that the connection of the cable is normal and will send a specific sequence of data again. If the data received from the communication module for three consecutive replies are all correct, the main controller will send instructions to the prompt module through channel 3. It does not make a sound; if it is not correct, the main controller will think that the cable connection is wrong and will send a specific sequence of data again. If the data received from the communication module for three consecutive replies are all wrong, the main controller will pass the channel 3. Send an instruction to the prompt module to make it make a warning sound: the connection of the cable is wrong; if the reply data received from the communication module for three consecutive times is either correct or incorrect, the main controller will think that the connection of the cable is not in good contact and pass through the channel 3. The prompt module sends an instruction to make it emit a warning sound: the cable terminal is in poor contact;

If the results of the three judgments are not the same, the main controller will determine the fault according to the priority. The priority is: poor connection of the cable connection > wrong connection of the cable > abnormal screen > unconnected cable > normal connection of the cable; priority The height is determined according to the detection logic in Figure 3. In the three data detections, the prompt module will alarm the farthest according to the logic. If the connection of the cable is normal, the prompt module will not issue a warning if it is normal for three times. Therefore, It has the lowest priority. For example: when the data received by the main controller has three situations: cable connection error, abnormal screen, and normal cable connection, the main controller prompts the module to send instructions to the prompt module through channel 3 to make it issue a warning according to the priority level Sound: cable connection error;

In order to prevent misjudgment, this function will periodically send data A, B, and C with a specific sequence predetermined by both parties to the communication module of the display module, and continuously detect the status of the display module, thereby realizing self-testing of the screen connection.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. A display fault detection method, characterized in that the method comprises: Pre-store the same detection data sequence on the main board side and the display screen side, the detection data sequence includes detection data for several times of detection; The main board side sends the detection data to the display screen according to the detection order, so that the display screen can receive data through wiring, and compare the data with the detection data pre-stored on the display screen Get the comparison result; The main board side receives the reply message returned by the display screen side, and records the reply time of receiving the reply message; the reply message includes the comparison result; The motherboard side diagnoses and displays the type of fault according to whether a response message is received, the reply time, and the comparison result in the several times of detection; the type of the displayed fault includes: cable disconnection, abnormal display, Wrong connection, poor contact of cable terminal, normal connection of cable. 2. The method according to claim 1, wherein the main board side diagnoses and displays the type of fault according to whether a response message, the reply time, and the comparison result are received in the several detections, including: In the several times of detection, if the main board does not receive a response message within the preset time interval (0, 5T), the diagnosis shows that the type of the fault is an open circuit of the cable. 3. The method according to claim 1, wherein the main board side diagnoses and displays the type of fault according to whether a response message, the reply time, and the comparison result are received in the several detections, including: In the several detections, if the recovery time is all within the preset time interval (T, 5T), the diagnosis shows that the type of the fault is an abnormality of the display screen. 4. The method according to claim 1, wherein the main board side diagnoses and displays the type of fault according to whether a response message, the reply time, and the comparison result are received in the several detections, including: In the several times of detection, if the recovery times are all within the preset time interval (0, T), and the comparison results are inconsistent, the diagnosis shows that the type of the fault is a cable connection error. 5. The method according to claim 1, wherein the main board side diagnoses and displays the type of fault according to whether a response message, the reply time, and the comparison result are received in the several detections, including: In the several times of detection, if the recovery time is within the preset time interval (0, T), and the comparison results of several times include both the comparison consistency and the comparison inconsistency, then the diagnosis shows that the type of the fault is wiring Terminal contact is bad. 6. The method according to claim 1, wherein the main board side diagnoses and displays the type of fault according to whether a response message, the reply time, and the comparison result are received in the several detections, including: In the several detections, if the recovery time is within the preset time interval (0, T), and the comparison results of several times are consistent, it is confirmed that the connection of the cable is normal. 7. The method according to claim 1, wherein the main board side diagnoses and displays the type of fault according to whether a response message, the reply time, and the comparison result are received in the several detections, including: In the several times of detection, if the detection result of whether the main board receives the response message is inconsistent, or the response time is not between the preset time intervals (0, T) or (T, 5T), then First determine the temporary display fault type corresponding to each detection, and then establish the highest priority temporary display fault type as the final detected display fault type. 8. The method according to claim 7, wherein the priority order of the temporary display fault types is: Poor contact of cable terminal > wrong connection of cable > abnormal display > broken circuit of cable > normal connection of cable. 9. The method according to any one of claims 2 to 7, characterized in that T=100ms. 10. The method according to claim 1, characterized in that the method further comprises: the main board side prompts the user with sound or light signals according to the type of the displayed fault.