CN112526395B

CN112526395B - Vehicle-mounted display screen signal transmission detection device, method and system

Info

Publication number: CN112526395B
Application number: CN202011383281.5A
Authority: CN
Inventors: 杨辉; 吴国栋
Original assignee: iFlytek Co Ltd
Current assignee: iFlytek Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2023-11-17
Anticipated expiration: 2040-11-30
Also published as: CN112526395A

Abstract

The invention provides a vehicle-mounted display screen signal transmission detection device, a method and a system, wherein the vehicle-mounted display screen signal transmission detection device comprises: the device comprises a processor, first to sixth judging units and a display screen driving module, wherein the processor sends PWM signals to the display screen driving module through a driving cable, and the driving cable is provided with first to fourth acquisition points; the first to fourth collection points and the feedback cable are respectively and electrically connected with the first to fourth judgment units, the first judgment unit and the second judgment unit are electrically connected with the fifth judgment unit, the third judgment unit and the fourth judgment unit are electrically connected with the sixth judgment unit, the first to fourth judgment units are OR gates, the fifth to sixth judgment units are OR gates, and the processor determines the state of the driving cable based on the output results of the first to sixth judgment units and the feedback cable. The vehicle-mounted display screen signal transmission detection device, method and system provided by the invention can greatly reduce the operation load of the processor and improve the detection efficiency.

Description

Vehicle-mounted display screen signal transmission detection device, method and system

Technical Field

The invention relates to the technical field of automobile electronic circuits, in particular to a device, a method and a system for detecting signal transmission of a vehicle-mounted display screen.

Background

Along with the gradual intellectualization of automobiles, the application of the vehicle-mounted display screen on the automobiles is more and more popular, the vehicle-mounted display screen is generally connected with a host computer of the automobiles through cables, and in use, the cables can have faults such as short circuit or open circuit and the like, so that the states of the cables need to be monitored.

At present, in the scheme of separating the vehicle-mounted display screen from the host machine of the automobile, no device or method for detecting the open circuit or short circuit fault of the cable is provided, and for detecting the driving signal, the polling operation or the capturing interrupt operation is often adopted in the host machine of the automobile, however, the resource cost of the host machine is increased by using the polling operation and the capturing interrupt operation, so that the load of the host machine is larger, and the detection efficiency of the signal transmission of the vehicle-mounted display screen is lower.

Disclosure of Invention

The invention provides a vehicle-mounted display screen signal transmission detection device, method and system, which are used for solving the defects that in the prior art, the resource cost of a host is increased, the load of the host is large, the detection efficiency of the vehicle-mounted display screen signal transmission is low, greatly reducing the operation load of a processor in the host and improving the detection efficiency of the vehicle-mounted display screen signal transmission.

The invention provides a signal transmission detection device of a vehicle-mounted display screen, which comprises: a processor; the display screen driving module is characterized in that the output end of the processor sends PWM signals to the display screen driving module through a driving cable, and a first acquisition point, a second acquisition point, a third acquisition point and a fourth acquisition point are arranged on the driving cable; the first collecting point and the feedback cable are electrically connected with the first judging unit; the second judging unit is electrically connected with the second collecting point and the feedback cable; the third judging unit is electrically connected with the third collecting point and the feedback cable; the fourth judging unit is electrically connected with the fourth collecting point and the feedback cable; the first judging unit and the second judging unit are electrically connected with the fifth judging unit; the third judging unit and the fourth judging unit are electrically connected with the sixth judging unit; wherein the first to fourth judgment units are or gates, the fifth to sixth judgment units are exclusive or gates, and the processor is configured to determine the state of the driving cable based on the output results of the first to sixth judgment units and the output result of the feedback cable.

According to the signal transmission detection device of the vehicle-mounted display screen provided by the invention, the signal transmission detection device of the vehicle-mounted display screen further comprises: the first end of the serializer is electrically connected with the output end of the processor, the first acquisition point is the output end of the processor, and the second acquisition point is the first end of the serializer; the first end of the deserializer is electrically connected with the second end of the serializer, the second end of the deserializer is electrically connected with the input end of the display screen driving module, the third acquisition point is the second end of the deserializer, and the fourth acquisition point is the input end of the display screen driving module.

According to the signal transmission detection device of the vehicle-mounted display screen provided by the invention, the feedback cable comprises: the first end of the serializer is electrically connected with the feedback end of the processor through the first feedback sub-cable; the first end of the deserializer is electrically connected with the second end of the serializer through the second feedback sub-cable; and the feedback end of the display screen driving module is electrically connected with the second end of the deserializer through the third feedback sub-cable.

According to the signal transmission detection device of the vehicle-mounted display screen, the output end of the processor and the first feedback sub-cable are electrically connected with the input end of the first judging unit; the first end of the serializer and the first feedback sub-cable are electrically connected with the input end of the second judging unit; the second end of the deserializer and the third feedback sub-cable are electrically connected with the input end of the third judging unit; the input end of the display screen driving module is electrically connected with the third feedback sub-cable and the input end of the fourth judging unit.

The invention also provides a method for detecting signal transmission of the vehicle-mounted display screen, which comprises the following steps: the method comprises the steps of obtaining output results of first to sixth judging units and feedback signals of a display screen driving module, wherein the output results of the first to sixth judging units and the feedback signals of the display screen driving module are generated based on driving signals sent to the display screen driving module; and outputting a detection result based on the output results of the first to sixth judging units and the feedback signal of the display screen driving module, wherein the detection result is used for representing the state of the driving cable.

According to the method for detecting signal transmission of a vehicle-mounted display screen provided by the invention, the outputting of the detection result based on the output result of the first to sixth judging units and the feedback signal of the display screen driving module comprises the following steps: if the output result of the first judging unit is 0, the output result of the second judging unit is 0, the output result of the third judging unit is 0, the output result of the fourth judging unit is 0, and the feedback signal is 0, determining that the driving cable is in a short circuit state between the first collecting point and the second collecting point; if the output result of the first judging unit is a square wave, the output result of the second judging unit is a square wave, the output result of the third judging unit is 0, the output result of the fourth judging unit is 0, the output result of the fifth judging unit is 1, the output result of the sixth judging unit is 1, and the feedback signal is 0, determining that the driving cable is in a short circuit state or an open circuit state between the second collecting point and the third collecting point, or in a short circuit state between the third collecting point and the fourth collecting point; if the output result of the first judging unit is a square wave, the output result of the second judging unit is 0, the output result of the third judging unit is 0, the output result of the fourth judging unit is 0, the output result of the fifth judging unit is X, the output result of the sixth judging unit is 1, and the feedback signal is 0, determining that the driving cable is in an open circuit state between the first collecting point and the second collecting point; if the output result of the first judging unit is a square wave, the output result of the second judging unit is a square wave, the output result of the third judging unit is a square wave, the output result of the fourth judging unit is 0, the output result of the fifth judging unit is 1, the output result of the sixth judging unit is X, and the feedback signal is 0, it is determined that the driving cable is in an open circuit state between the third collecting point and the fourth collecting point.

The invention also provides a vehicle-mounted display screen signal transmission detection system, which comprises: the display screen driving module is used for displaying the output result of the first judging unit, the output result of the second judging unit and the feedback signal of the display screen driving module, wherein the output result of the first judging unit, the output result of the sixth judging unit and the feedback signal of the display screen driving module are generated based on PWM signals sent to the display screen driving module; and the output module is used for outputting a detection result based on the output results of the first to sixth judging units and the feedback signal of the display screen driving module, and the detection result is used for representing the state of the driving cable.

The invention also provides a method for detecting the signal transmission of the vehicle-mounted display screen, which comprises the following steps: the method comprises the steps of obtaining output results of first to sixth judging units and feedback signals of a display screen driving module, wherein the output results of the first to sixth judging units and the feedback signals of the display screen driving module are generated based on PWM signals sent to the display screen driving module; if the feedback signal is 0, obtaining output results of the first to fourth judging units; if the first to fourth judging units are all 0, determining that the driving cable is in a short circuit state between the first acquisition point and the second acquisition point; if the first to fourth judging units are not 0, obtaining an output result of the fifth judging unit and an output result of the sixth judging unit; if the output result of the fifth judging unit is 1 and the output result of the sixth judging unit is X, determining that the driving cable is in an open circuit state between the third acquisition point and the fourth acquisition point; if the output result of the fifth judging unit is 1 and the output result of the sixth judging unit is 1, determining that the driving cable is in a short circuit state or an open circuit state between the second collecting point and the third collecting point or in a short circuit state between the third collecting point and the fourth collecting point; and if the output result of the fifth judging unit is X and the output result of the sixth judging unit is 1, determining that the driving cable is in an open circuit state between the first acquisition point and the second acquisition point.

The invention also provides a vehicle-mounted display screen signal transmission detection system, which comprises: the first acquisition unit is used for acquiring output results of the first judgment unit, the second judgment unit and feedback signals of the display screen driving module, wherein the output results of the first judgment unit, the second judgment unit and the feedback signals of the display screen driving module are generated based on PWM signals sent to the display screen driving module; the second acquisition unit is used for acquiring output results of the first to fourth judgment units if the feedback signal is 0; a first determining unit configured to determine that the driving cable is in a short-circuit state between the first acquisition point and the second acquisition point if the first to fourth judging units are all 0; a third obtaining unit, configured to obtain an output result of the fifth judging unit and an output result of the sixth judging unit if the first to fourth judging units are not all 0; the second determining unit is configured to determine that the driving cable is in an open-circuit state between the third acquisition point and the fourth acquisition point if the output result of the fifth determining unit is 1 and the output result of the sixth determining unit is X; a third determining unit, configured to determine that the driving cable is in a short-circuit state or an open-circuit state between the second acquisition point and the third acquisition point, or in a short-circuit state between the third acquisition point and the fourth acquisition point, if the output result of the fifth determining unit is 1 and the output result of the sixth determining unit is 1; and the fourth determining unit is used for determining that the driving cable is in an open circuit state between the first acquisition point and the second acquisition point if the output result of the first judging unit is X and the output result of the second judging unit is 1.

The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the steps of the method for detecting signal transmission of the vehicle-mounted display screen are realized when the processor executes the program.

The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of a method of signal transmission detection of an on-board display screen as described in any of the above.

According to the vehicle-mounted display screen signal transmission detection device, method and system, the feedback cable is arranged between the display screen driving module and the processor, the plurality of acquisition points are arranged on the driving cable, the acquisition points and the feedback cable are electrically connected with the judging module, and the driving cable is subjected to preliminary detection through the judging module, so that the operation load of the processor in the host can be greatly reduced, and the detection efficiency of vehicle-mounted display screen signal transmission is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a signal transmission detection device for a vehicle-mounted display screen;

fig. 2 is a schematic structural diagram of a first judging unit or a second judging unit of the signal transmission detecting device for a vehicle-mounted display screen provided by the invention;

fig. 3 is a schematic structural diagram of a third judging unit or a fourth judging unit of the signal transmission detecting device for a vehicle-mounted display screen provided by the invention;

fig. 4 is a schematic structural diagram of a fifth judging unit of the signal transmission detecting device for a vehicle-mounted display screen provided by the invention;

fig. 5 is a schematic structural diagram of a sixth judging unit of the signal transmission detecting device for a vehicle-mounted display screen provided by the invention;

FIG. 6 is a schematic flow chart of a method for detecting signal transmission of a vehicle-mounted display screen according to the present invention;

FIG. 7 is a schematic diagram of a signal transmission detection system of a vehicle-mounted display screen according to the present invention;

FIG. 8 is a second flow chart of a method for detecting signal transmission of a vehicle-mounted display screen according to the present invention;

FIG. 9 is a second schematic diagram of a signal transmission detection system for a vehicle-mounted display screen according to the present invention;

fig. 10 is a schematic structural diagram of an electronic device provided by the present invention.

Reference numerals:

1: a first acquisition point; 2: a second acquisition point; 3: a third acquisition point;

4: a fourth collection point; 5: a fifth collection point; 6: a sixth collection point;

7: a seventh acquisition point; 8: an eighth collection point; a1: a first judgment unit;

a2: a second judgment unit; a3: a third judgment unit; a4: a fourth judgment unit;

a5: a fifth judging unit; a6: a sixth judgment unit; c1: a processor;

c2: a serializer; and C3: a deserializer; and C4: and a display screen driving module.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The following describes a device, a method and a system for detecting signal transmission of a vehicle-mounted display screen according to an embodiment of the present invention with reference to fig. 1 to 10.

As shown in fig. 1, an embodiment of the present invention provides a signal transmission detection device for a vehicle-mounted display screen, where the signal transmission detection device for a vehicle-mounted display screen includes: processor C1, display screen drive module C4 and judgement module.

The vehicle-mounted display screen may be an LCD (Liquid Crystal Display ) display screen, an LED (Light Emitting Diode ) display screen or a CRT (Cathode Ray Tube) display screen, and when the vehicle-mounted display screen is an LCD display screen, the display screen driving module C4 is a backlight driving module, and the imaging principle of the LCD display screen is that the backlight source is used as a light source to emit light, and the light is transmitted or reflected in the liquid crystal molecular layer to implement imaging.

Processor C1 may be an MCU (Microcontroller Unit, micro control unit).

The input end of the display screen driving module C4 is electrically connected with the output end of the processor C1 through a driving cable, the output end of the processor C1 can be an IO interface of the processor C1, and at least three acquisition points are arranged on the driving cable.

It will be appreciated that the processor C1 sends a drive signal to the display screen driving module C4 via the drive cable, where the drive signal may include a PWM (Pulse Width Modulation ) signal, and the display screen driving module C4 may drive the display screen to operate according to the drive signal provided by the processor C1, for example, the display screen may display vehicle information such as a vehicle speed, a remaining oil amount, or a navigation map according to the drive signal provided by the processor C1.

At least three acquisition points are arranged on the driving cable, the acquisition points are arranged at intervals, and the processor C1 can judge the state of the driving cable through driving signals read by the acquisition points.

The display screen driving module C4 is further electrically connected to the processor C1 through a feedback cable, and after receiving the driving signal of the processor C1, the display screen driving module C4 may output a feedback signal to the processor C1 through the feedback cable, and similarly, for the processor C1, may determine the state of the driving cable by using the feedback signal as a reference.

The feedback cable and the acquisition point are electrically connected with a judging module, and the judging module is electrically connected with the processor C1.

It will be appreciated that the lead may be electrically connected to the input of the judgment module by a lead on the feedback cable, and the lead may be electrically connected to the input of the judgment module by a plurality of collection points, while the output of the judgment module is electrically connected to the input of the processor C1.

The judging module can calculate according to the feedback signals output by the feedback cables and the driving signals output by the acquisition points to obtain a preliminary detection result.

The processor C1 is configured to determine a state of the drive cable between the acquisition points based on the output result of the judgment module and the output result of the feedback cable.

It can be understood that the processor C1 may process according to the preliminary detection result output by the determining module and the feedback signal output by the feedback cable, so as to determine the state of the driving cable between the collection points, for example, whether the driving cable has a fault or not may be determined according to the feedback signal, if the processor C1 normally receives the feedback signal, it indicates that the driving cable has no fault, if the processor C1 does not receive the feedback signal, it indicates that the driving cable has a fault, at this time, the preliminary detection result output by the determining module is processed again, so as to determine the fault position and the fault condition of the driving cable.

The existing open-short circuit fault detection of the PWM signal usually uses a processor C1 to carry out polling operation and capturing interruption operation, and the polling operation method is to connect the PWM signal to the other detection port of the MCU after the MCU outputs the PWM, because the PWM is a square wave, the high-low level cycle changes, the MCU is required to always detect and compare whether the output PWM signal and the input PWM signal are the same, so that larger resources of the MCU are occupied to finish the detection of the PWM; the method for capturing the interrupt operation is to utilize the double-edge capturing function of a timer or an IO interface, generate an interrupt when capturing occurs, and identify the rising and falling edges at the interrupt position so as to calculate the frequency and the duty ratio of PWM. Similar to polling, this approach also takes up a large amount of MCU resources to detect if PWM is abnormal.

According to the vehicle-mounted display screen signal transmission detection device provided by the embodiment of the invention, the feedback cable is arranged between the display screen driving module C4 and the processor C1, the plurality of acquisition points are arranged on the driving cable, the acquisition points and the feedback cable are electrically connected with the judging module, and the driving cable is subjected to preliminary detection by the judging module, so that the operation load of the processor C1 in a host can be greatly reduced, and the detection efficiency of vehicle-mounted display screen signal transmission is improved.

As shown in fig. 1, in some embodiments, the determining module includes: a plurality of first type judging units and at least one second type judging unit.

The first type judging unit is electrically connected with the feedback cable and any acquisition point, and the second type judging unit is electrically connected with at least two first type judging units.

It can be understood that the feedback cable and any sampling point are electrically connected with the input end of the first type judging unit, the number of the first type judging units can be the same as that of the sampling points, so that all the sampling points can be covered, and the first type judging unit can operate the feedback signal and the driving signal of any sampling point.

The input end of any second type judging unit is electrically connected with the output end of the first type judging unit, each second type judging unit can be electrically connected with at least two first type judging units, and the second type judging unit can process the output results of the first type judging units.

The output end of the first type judging unit and the output end of the second type judging unit are electrically connected with the input end of the processor C1.

By designing the first type judging unit and the second type judging unit which are cascaded, classification and sequential processing can be realized, and the detection efficiency can be further improved.

As shown in fig. 1, in some embodiments, the drive cable is provided with first 1, second 2, third 3 and fourth 4 spaced apart acquisition points.

By the first, second, third and fourth spaced-apart acquisition points 1, 2, 3 and 4, three sections can be obtained on the drive cable, such as a section between the first and second acquisition points 1, 2, 3, and a section between the third and fourth acquisition points 3, 4.

As shown in fig. 1, the plurality of first-type judgment units include: the first judgment unit A1, the second judgment unit A2, the third judgment unit A3, and the fourth judgment unit A4.

The first collecting point 1 and the feedback cable are electrically connected with the input end of the first judging unit A1, the second collecting point 2 and the feedback cable are electrically connected with the input end of the second judging unit A2, the third collecting point 3 and the feedback cable are electrically connected with the input end of the third judging unit A3, and the fourth collecting point 4 and the feedback cable are electrically connected with the input end of the fourth judging unit A4.

It will be appreciated that the first determining unit A1 can process the driving signal output by the first collecting point 1 and the feedback signal output by the feedback cable, the second determining unit A2 can process the driving signal output by the second collecting point 2 and the feedback signal output by the feedback cable, the third determining unit A3 can process the driving signal output by the third collecting point 3 and the feedback signal output by the feedback cable, and the fourth determining unit A4 can process the driving signal output by the fourth collecting point 4 and the feedback signal output by the feedback cable.

As shown in fig. 1, the at least one second type of judging unit includes: a fifth judgment unit A5 and a sixth judgment unit A6.

The output end of the first judging unit A1 and the output end of the second judging unit A2 are electrically connected with the input end of the fifth judging unit A5, and the output end of the third judging unit A3 and the output end of the fourth judging unit A4 are electrically connected with the input end of the sixth judging unit A6.

It is to be understood that the fifth judging unit A5 can process the output result of the first judging unit A1 and the output result of the second judging unit A2, and the sixth judging unit A6 can process the output result of the third judging unit A3 and the output result of the fourth judging unit A4.

The output ends of the first to sixth judging units are electrically connected with the input end of the processor C1, and the processor C1 can judge the state of the driving cable according to the output results of the first to sixth judging units and the feedback signal.

As shown in fig. 2, 3, 4 and 5, in some embodiments, the first type of determining unit and the second type of determining unit are gates.

It is understood that a gate circuit is a unit circuit to implement basic logic operation and complex logic operation. The common gate circuits have several logic functions including and gate, or gate, not gate, nand gate, or gate, and or gate, exclusive or gate, etc. The first type judging unit and the second type judging unit are selected as the gate circuits, so that the operation process is simple and efficient, and the production and manufacturing cost is reduced.

As shown in fig. 2, 3, 4 and 5, in some embodiments, the first type of determining unit is an or gate, and the second type of determining unit is an exclusive or gate.

It is understood that an OR gate (OR gate), also known as an OR circuit, logic, and circuitry. If one of several conditions is met, an event occurs, which is called an or logical relationship. A circuit having an or logic relationship is called an or gate. The OR gate has a plurality of input terminals and an output terminal, and the output is high level (logic '1') whenever one of the input terminals is high level (logic '1'); the output is low (logic "0") only if all inputs are low (logic "0").

The OR gate is formulated as

Y＝A+B＝(A′B′)′

Wherein A 'is non-A, B' is non-B, and Y represents the output result.

An exclusive nor gate (in english: XNOR gate or equivalence gate) is also called an exclusive nor gate, and an nor gate is added to the output end of the exclusive nor gate to form an exclusive nor gate, which is a basic unit of a digital logic circuit, and has 2 input ends and 1 output end. When one and only one of the 2 inputs is low (logic 0), the output is low. I.e. when the input levels are the same, the output is high (logic 1).

The formula of the exclusive-OR gate is expressed as

Y＝A⊙B＝A·B+A′·B′

Wherein A 'is not A, B' is not B, the addition is an exclusive OR operator, and Y represents an output result.

By selecting the first type of judgment unit as an OR gate and selecting the second type of judgment unit as an exclusive OR gate, the logic operation can be further simplified, and the detection efficiency of the driving cable can be further improved.

As shown in fig. 1, in some embodiments, the on-vehicle display screen signal transmission detection apparatus further includes: serializer C2 and deserializer C3.

Serializer C2 may be located at the host end of the car and deserializer C3 may be located at the display end.

The first end of the serializer C2 is electrically connected with the output end of the processor C1, the first acquisition point 1 is the output end of the processor C1, the second acquisition point 2 is the first end of the serializer C2, the first end of the deserializer C3 is electrically connected with the second end of the serializer C2, the second end of the deserializer C3 is electrically connected with the input end of the display screen driving module C4, the third acquisition point 3 is the second end of the deserializer C3, and the fourth acquisition point 4 is the input end of the display screen driving module C4.

It can be understood that the processor C1 may generate a PWM signal, where the output end of the processor C1 sends the PWM signal to the first end of the serializer C2, and the serializer C2 packages the PWM signal and transmits the PWM signal to the first end of the deserializer C3 through the second end, and the deserializer C3 parses the PWM signal and outputs the PWM signal (pwm=pwm') to the input end of the display driving module C4.

After receiving the PWM 'signal, the display screen driving module C4 outputs a Feedback signal Feedback' to the host end to indicate normal reception, where the Feedback 'is packaged by the deserializer C3 and then transmitted to the serializer C2 via the Feedback cable, and the serializer C2 parses the Feedback signal and outputs the Feedback signal (during normal transmission, feedback=feedback') to the input end of the processor C1.

The third judging unit outputs PWM3', the fourth judging unit outputs PWM4', the deserializer C3 transmits PWM3 'and PWM4' to the serializer C2, and the serializer C2 parses the same and then correspondingly outputs PWM3 and PWM4 signals (PWM 3=pwm 3', PWM 4=pwm 4' in normal transmission).

Because the host end and the display screen end are often far away from each other, in a general use scene, the host end and the display screen end are often more than 1m away from each other, and a cable suitable for long-distance transmission is adopted between the serializer C2 and the deserializer C3.

Here, the serializer C2 is configured to convert the signal packets that need to be sent to the display screen end by the host end into a low-voltage differential signal that can be transmitted remotely and parse the low-voltage differential signal sent back by the display screen end, and similarly, the deserializer C3 is configured to parse the low-voltage differential signal sent from the host end into a signal that is consistent with the host end and convert the signal packets that need to be sent back to the host end by the display screen end into a low-voltage differential signal.

As shown in fig. 1, in some embodiments, the feedback cable includes: the first feedback sub-cable, the second feedback sub-cable and the third feedback sub-cable.

The first end of the serializer C2 is electrically connected with the feedback end of the processor C1 through a first feedback sub-cable; the output end of the processor C1 and the first feedback sub-cable are electrically connected with the input end of the first judging unit A1; the first end of the serializer C2 and the first feedback sub-cable are electrically connected to the input end of the second judging unit A2.

A seventh acquisition point 7 and an eighth acquisition point 8 may be provided on the first feedback sub-cable, the seventh acquisition point 7 being the first end of the serializer C2, the eighth acquisition point 8 being the input of the processor C1.

The first acquisition point 1 and the eighth acquisition point 8 are points close to a pin of the processor C1, the acquired signals are used as input of the first judgment unit A1, after being processed by logic operation, the first judgment unit A1 outputs PWM1 signals, and the output end of the first judgment unit A1 is electrically connected with the GPIO2 of the processor C1.

The second acquisition point 2 and the seventh acquisition point 7 are points close to the pin of the serializer C2, the acquired signals are used as the input of the second judgment unit A2, after being processed by logic operation, the second judgment unit A2 outputs PWM2 signals, and the output end of the second judgment unit A2 is electrically connected with the GPIO1 of the processor C1.

The first end of the deserializer C3 is electrically connected to the second end of the serializer C2 through a second feedback sub-cable.

The feedback end of the display screen driving module C4 is electrically connected with the second end of the deserializer C3 through a third feedback sub-cable.

The second end of the deserializer C3 and the third feedback sub-cable are electrically connected with the input end of the third judgment unit A3.

The third feedback sub-cables of the input end of the display screen driving module C4 are electrically connected with the input end of the fourth judging unit A4.

A fifth collection point 5 and a sixth collection point 6 may be set on the second feedback sub-cable, where the fifth collection point 5 is an output end of the display screen driving module C4, and the sixth collection point 6 is a second end of the deserializer C3.

The third acquisition point 3 and the sixth acquisition point 6 are points close to the pin of the deserializer C3, the acquired signals are used as the input of the third judgment unit A3, after being processed by logic operation, the third judgment unit A3 outputs PWM3' signals, and the output end of the third judgment unit A3 is electrically connected with the GPIO5 of the processor C1.

The fourth acquisition point 4 and the fifth acquisition point 5 are points close to a pin of the display screen driving module C4, the acquired signals are used as input of the fourth judgment unit A4, after being processed by logic operation, the fourth judgment unit A4 outputs PWM4' signals, and the output end of the fourth judgment unit A4 is electrically connected with the GPIO6 of the processor C1.

The output end of the first judging unit A1 and the output end of the second judging unit A2 are electrically connected with the fifth judging unit A5, and the output end of the third judging unit A3 and the output end of the fourth judging unit A4 are electrically connected with the sixth judging unit A6.

The output end of the fifth judging unit A5 is electrically connected with the GPIO3 of the processor C1, and the output end of the sixth judging unit A6 is electrically connected with the GPIO4 of the processor C1.

The output end of the third judging unit A3 is electrically connected with the input end of the fifth judging unit A5 through a deserializer C3 and a serializer C2; the output end of the fourth judging unit A4 is electrically connected with the input end of the sixth judging unit A6 through the deserializer C3 and the serializer C2.

With such an arrangement, the first judgment unit A1, the second judgment unit A2, the fifth judgment unit A5 and the sixth judgment unit A6 can be placed at the host side, the third judgment unit A3 and the fourth judgment unit A4 are placed at the display side, the output result of the third judgment unit A3 and the output result of the fourth judgment unit A4 are transmitted to the processor C1, the fifth judgment unit A5 and the sixth judgment unit A6 at the host side through the serializer C2 and the deserializer C3, the arrangement of circuits can be facilitated, and the transmission of the driving signal, the feedback signal and the output result of the third to fourth judgment units related to detection between the display side and the host side can be realized only through the long-distance transmission cable between the serializer C2 and the deserializer C3, so that the integrity of the signal transmission detection device for the vehicle-mounted display screen is improved.

As shown in fig. 1, in some embodiments, the second cable and the second feedback sub-cable form a shielded twisted pair or a coaxial shielded cable.

The transmission protocols between the serializer C2 and the deserializer C3 used in the vehicle-mounted scene are mainly the FPD-LINK protocol and the GMSL protocol. The serializer C2 and the deserializer C3 used in the serial LINKs of the FPD-LINK protocol and the GMSL protocol support Shielded Twisted Pair (STP) or coaxial Cable (COAX) transmission up to 15m, and meet the most severe electromagnetic compatibility (EMC) requirements of the automotive industry.

The basic principle of the normal operation of the display screen is as follows: PWM signals sent by a processor C1 in the host end are sent to a serializer C2, and are packaged by the serializer C2 and then sent to a deserializer C3 through a COAX/STP cable, and the deserializer C3 restores the PWM signals after analysis and then transmits the PWM signals to a display screen driving module C4, so that the liquid crystal display screen can normally display images.

As shown in fig. 6, the embodiment of the present invention further provides a method for detecting signal transmission of a vehicle-mounted display screen, where the method for detecting signal transmission of a vehicle-mounted display screen includes the following steps 110 to 120.

Wherein, step 110: the output results of the first to sixth judging units and the feedback signal of the display screen driving module C4 are obtained, and the output results of the first to sixth judging units and the feedback signal of the display screen driving module C4 are generated based on the driving signals sent to the display screen driving module C4.

It can be understood that, the processor C1 of the vehicle-mounted display screen signal transmission detection device is utilized to send a driving signal to the display screen driving module C4, so as to obtain a feedback signal of the display screen driving module C4, an output result of the first judging unit A1, an output result of the second judging unit A2, an output result of the third judging unit A3, an output result of the fourth judging unit A4, an output result of the fifth judging unit A5 and an output result of the sixth judging unit A6.

Step 120: based on the output results of the first to sixth judging units and the feedback signal of the display screen driving module C4, a detection result is output, and the detection result is used for representing the state of the driving cable.

It can be understood that the states of the driving cables among the first, second, third, and fourth collection points 1, 2, 3, and 4 are determined according to the output result of the first, second, third, and fourth determination units A1, A2, A3, A4, A1, A2, and the feedback signal.

According to the method for detecting the signal transmission of the vehicle-mounted display screen, provided by the embodiment of the invention, the drive cable is initially detected by the judging module, so that the operation load of the processor C1 in the host can be greatly reduced, and the detection efficiency of the signal transmission of the vehicle-mounted display screen is improved.

In some embodiments, outputting the detection result based on the output result of the first to sixth judging units and the feedback signal of the display screen driving module C4 includes:

if the output result of the first judging unit A1 is 0, the output result of the second judging unit A2 is 0, the output result of the third judging unit A3 is 0, the output result of the fourth judging unit A4 is 0, and the feedback signal is 0, it is determined that the driving cable is in a short circuit state between the first collecting point 1 and the second collecting point 2.

It can be understood that when the connection line between the first sampling point 1 and the second sampling point 2 is shorted to the ground, the PWM signal output by the MCU is shorted to the ground, the voltages of the first sampling point 1 and the second sampling point 2 are 0, and the voltages of the third sampling point 3 and the fourth sampling point 4 are also 0.Feed back '=0, because feed back' will output 1 after the display panel driving module C4 outputs normally, otherwise, it is 0, so pwm=0, feed back=0, PWM '=0, feed back' =0. Therefore, the signals at the two input ends of the first determining unit A1 are both 0, and at this time, the first determining unit A1 performs an or logic operation on the signals, and the output result is 0, that is, pwm1=0. Similarly, pwm2=0, pwm3=0, pwm4=0.

If the output result of the first judging unit A1 is a square wave, the output result of the second judging unit A2 is a square wave, the output result of the third judging unit A3 is 0, the output result of the fourth judging unit A4 is 0, the output result of the fifth judging unit A5 is 1, the output result of the sixth judging unit A6 is 1, and the feedback signal is 0, it is determined that the driving cable is in a short-circuit state or an open-circuit state between the second collecting point 2 and the third collecting point 3, or in a short-circuit state between the third collecting point 3 and the fourth collecting point 4.

It can be understood that when the connection between the second sampling point 2 and the third sampling point 3 is shorted to the ground, the PWM signal output by the MCU is transmitted normally on the connection before the second sampling point 2, and the signal is at a low level 0 after the second sampling point 2, then pwm=square wave, feed back=0, PWM '=0, feed back' =0. Therefore, the first judgment unit A1 and the second judgment unit A2 output square waves consistent with PWM, and the third judgment unit A3 and the fourth judgment unit A4 output square waves are both 0, that is, PWM 1=square wave, PWM 2=square wave, PWM 3=0, pwm4=0. Further, PWM1 and PWM2 are input to the fifth judgment unit A5 to perform an exclusive nor operation, and the output is 1, and similarly, PWM3 and PWM4 are input to the sixth judgment unit A6 to perform an exclusive nor operation, and the output is also 1, which may be expressed as (GPIO 3, GPIO 4) = (1, 1).

When the connection line between the second sampling point 2 and the third sampling point 3 is open, the PWM signal output by the MCU is normal before the second sampling point 2, and the third sampling point 3 is low level 0, then pwm=square wave, feedback=0, PWM '=0, feedback' =0. Therefore, the first judgment unit A1 and the second judgment unit A2 output square waves consistent with PWM, and the third judgment unit A3 and the fourth judgment unit A4 output square waves are both 0, that is, PWM 1=square wave, PWM 2=square wave, PWM 3=0, pwm4=0. Further, PWM1 and PWM2 are input to the fifth judgment unit A5 to be subjected to exclusive nor operation, and output is 1. Similarly, PWM3 and PWM4 are input to the sixth judgment unit A6 to perform an exclusive nor operation, and the output is 1, which may be expressed as (GPIO 3, GPIO 4) = (1, 1).

When the connection line between the third sampling point 3 and the fourth sampling point 4 is short-circuited to the ground, the connection line transmission of the PWM signal output by the MCU before the third sampling point 3 is normal, and the signal is at a low level 0 after the third sampling point 3, then pwm=square wave, feedback=0, PWM '=0, and Feedback' =0. Therefore, the first judgment circuit and the second judgment circuit output square waves consistent with PWM, and the third judgment circuit and the fourth judgment circuit output 0, namely PWM1 = square wave, PWM2 = square wave, PWM3 = 0, and pwm4 = 0. Further, PWM1 and PWM2 are input to the fifth determination circuit to perform an exclusive nor operation, and the output is 1, and similarly, PWM3 and PWM4 are input to the sixth determination circuit to perform an exclusive nor operation, and the output is also 1, which may be expressed as (GPIO 3, GPIO 4) = (1, 1).

If the output result of the first judging unit A1 is a square wave, the output result of the second judging unit A2 is 0, the output result of the third judging unit A3 is 0, the output result of the fourth judging unit A4 is 0, the output result of the fifth judging unit A5 is X, the output result of the sixth judging unit A6 is 1, and the feedback signal is 0, it is determined that the driving cable is in an open state between the first collecting point 1 and the second collecting point 2.

X represents an asynchronous square wave, i.e. there is a phase difference with the square wave, the state being unstable.

It can be understood that when the connection between the first sampling point 1 and the second sampling point 2 is open, the PWM signal output by the MCU is normal before the first sampling point 1, and the second sampling point 2 is low level 0 later, then pwm=square wave, feedback=0, PWM '=0, and Feedback' =0. Therefore, the first judgment unit A1 outputs a square wave consistent with PWM, and the second judgment unit A2, the third judgment unit A3, and the fourth judgment unit A4 all output 0, that is, PWM 1=square wave, PWM 2=0, pwm3=0, pwm4=0. Further, PWM1 and PWM2 are input to the fifth judgment unit A5 to perform an exclusive nor logical operation, and the output is a square wave, and the state is unstable for the MCU and is represented by an unknown number X. Similarly, PWM3 and PWM4 are input to the sixth judgment unit A6 to perform an exclusive nor operation, and the output is 1, which may be expressed as (GPIO 3, GPIO 4) = (X, 1).

If the output result of the first judging unit A1 is a square wave, the output result of the second judging unit A2 is a square wave, the output result of the third judging unit A3 is a square wave, the output result of the fourth judging unit A4 is 0, the output result of the fifth judging unit A5 is 1, the output result of the sixth judging unit A6 is X, and the feedback signal is 0, it is determined that the driving cable is in an open state between the third collecting point 3 and the fourth collecting point 4.

It can be understood that when the connection between the third sampling point 3 and the fourth sampling point 4 is open, the PWM signal output by the MCU is normal before the third sampling point 3, and the fourth sampling point 4 is at a low level 0, pwm=square wave, feedback=0, PWM ' (third sampling point 3) =square wave, PWM ' (fourth sampling point 4) =0, feedback ' =0. Therefore, the first, second and third judgment units A1, A2 and A3 output square waves consistent with PWM, and the fourth judgment unit A4 outputs 0, that is, pwm1=square wave, pwm2=square wave, pwm3=square wave, pwm4=0. Further, PWM1 and PWM2 are input to the fifth judgment unit A5 to be subjected to exclusive nor operation, and output is 1. Similarly, PWM3 and PWM4 are input to the sixth determining unit A6 to perform an exclusive nor operation, and the output is still a square wave, and this state is unstable for the MCU and is represented by the unknown number X. Therefore, it can be expressed as (GPIO 3, GPIO 4) = (1, x).

If the output result of the first judging unit A1 is 1, the output result of the second judging unit A2 is 1, the output result of the third judging unit A3 is 1, the output result of the fourth judging unit A4 is 1, and the feedback signal is 1, determining that the driving cable is in a normal state between the first collecting point 1 and the fourth collecting point 4.

It will be appreciated that when the PWM signal full path transmission is normal, pwm=square wave, feed back=1, PWM '=square wave, feed back' =1. The outputs of the first judging unit A1, the second judging unit A2, the third judging unit A3 and the fourth judging unit A4 are all 1. At this time, it is only necessary to detect that the value of feed back is 1, which indicates that it is normal.

The feedback signals outputted by the feedback cables and the output results of the first to sixth judging units are shown in table 1.

TABLE 1

The signal transmission detection system of the vehicle-mounted display screen provided by the embodiment of the invention is described below, and the signal transmission detection system of the vehicle-mounted display screen described below and the signal transmission detection method of the vehicle-mounted display screen described above can be correspondingly referred to each other.

As shown in fig. 7, the embodiment of the present invention further provides a signal transmission detection system for a vehicle-mounted display screen, where the signal transmission detection system for a vehicle-mounted display screen includes: an acquisition module 11 and an output module 12.

The obtaining module 11 is configured to obtain the output results of the first to sixth determining units and the feedback signal of the display driving module C4, where the output results of the first to sixth determining units and the feedback signal of the display driving module C4 are both generated based on the PWM signal sent to the display driving module C4.

The output module 12 is configured to output a detection result based on the output results of the first to sixth judging units and the feedback signal of the display screen driving module C4, where the detection result is used to characterize the state of the driving cable.

The specific implementation manner of the method and the implementation manner of the method are consistent, and are not repeated here.

As shown in fig. 8, the implementation of the present invention further provides a method for detecting signal transmission of a vehicle-mounted display screen, where the method for detecting signal transmission of a vehicle-mounted display screen uses the device for detecting signal transmission of a vehicle-mounted display screen in the above embodiment.

The signal transmission detection method of the vehicle-mounted display screen comprises the following steps: steps 210-280 are as follows.

Wherein, step 210: the output results of the first to sixth judging units and the feedback signal of the display screen driving module C4 are obtained, and the output results of the first to sixth judging units and the feedback signal of the display screen driving module C4 are generated based on PWM signals sent to the display screen driving module C4.

It can be understood that the states of the driving cables among the first, second, third, and fourth collection points 1, 2, 3, and 4 are determined according to the output result of the first, second, third, and fourth determination units A1, A2, A3, A4, A5, A6, and the feedback signals.

Step 220: and if the feedback signal is 0, obtaining output results of the first to fourth judging units.

It can be understood that if the feedback signal is 1, the driving cable is in a normal state between the first collecting point 1 and the fourth collecting point 4, and if the feedback signal is 0, the output result of the first judging unit A1, the output result of the second judging unit A2, the output result of the third judging unit A3 and the output result of the fourth judging unit A4 are obtained;

step 230: if the first to fourth judging units are all 0, it is determined that the driving cable is in a short circuit state between the first collecting point 1 and the second collecting point 2.

Step 240: if the first to fourth judging units are not all 0, the output result of the fifth judging unit A5 and the output result of the sixth judging unit A6 are obtained.

Step 250: if the output result of the fifth judging unit A5 is 1 and the output result of the sixth judging unit A6 is X, it is determined that the driving cable is in an open state between the third collecting point 3 and the fourth collecting point 4.

Step 260: if the output result of the fifth judging unit A5 is 1 and the output result of the sixth judging unit A6 is 1, it is determined that the driving cable is in a short-circuit state or an open-circuit state between the second collecting point 2 and the third collecting point 3, or in a short-circuit state between the third collecting point 3 and the fourth collecting point 4.

Step 270: if the output result of the fifth judging unit A5 is X and the output result of the sixth judging unit A6 is 1, it is determined that the driving cable is in an open state between the first collecting point 1 and the second collecting point 2.

According to the embodiment of the invention, the feedback signal of the feedback cable is firstly acquired, whether the output results of the first judgment unit to the fourth judgment unit are acquired is determined according to the feedback signal, whether the output results of the fifth judgment unit to the sixth judgment unit are acquired is determined according to the output results of the first acquisition module to the fourth acquisition module, complex operation can be put in front, and the operation of the processor C1 is mainly put on the fifth judgment unit A5 and the sixth judgment unit A6, so that the operation load of the processor C1 can be further reduced, and the detection efficiency is improved.

As shown in fig. 9, the embodiment of the present invention further provides a signal transmission detection system for a vehicle-mounted display screen, where the signal transmission detection system for a vehicle-mounted display screen includes: the first acquisition unit 21, the second acquisition unit 22, the first determination unit 23, the third acquisition unit 24, the second determination unit 25, the third determination unit 26, and the fourth determination unit 27.

The first obtaining unit 21 is configured to obtain the output results of the first to sixth determining units and the feedback signal of the display driving module C4, where the output results of the first to sixth determining units and the feedback signal of the display driving module C4 are both generated based on the PWM signal sent to the display driving module C4.

The second obtaining unit 22 is configured to obtain the output results of the first to fourth judging units if the feedback signal is 0.

The first determining unit 23 is configured to determine that the driving cable is in a short-circuit state between the first acquisition point 1 and the second acquisition point 2 if the first to fourth judging units are all 0.

The third obtaining unit 24 is configured to obtain the output result of the fifth judging unit A5 and the output result of the sixth judging unit A6 if the first to fourth judging units are not all 0;

the second determining unit 25 is configured to determine that the driving cable is in an open state between the third collection point 3 and the fourth collection point 4 if the output result of the fifth determining unit A5 is 1 and the output result of the sixth determining unit A6 is X.

The third determining unit 26 is configured to determine that the driving cable is in a short-circuit state or an open-circuit state between the second collection point 2 and the third collection point 3, or in an open-circuit state between the third collection point 3 and the fourth collection point 4, if the output result of the fifth determining unit A5 is 1 and the output result of the sixth determining unit A6 is 1.

The fourth determining unit 27 is configured to determine that the driving cable is in an open state between the first collection point 1 and the second collection point 2 if the output result of the first determining unit A1 is X and the output result of the second determining unit A2 is 1.

Fig. 10 illustrates a physical schematic diagram of an electronic device, as shown in fig. 8, which may include: processor (processor) 101, communication interface (Communications Interface) 102, memory (memory) 103 and communication bus 104, wherein processor 101, communication interface 102, memory 103 accomplish the communication between each other through communication bus 104. The processor 101 may invoke logic instructions in the memory 103 to perform a method of in-vehicle display screen signaling detection comprising: the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are obtained, and the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are generated based on the driving signals sent to the display screen driving module C4; based on the output results of the first to sixth judging units and the feedback signal of the display screen driving module C4, a detection result is output, and the detection result is used for representing the state of the driving cable.

The processor 101 may invoke logic instructions in the memory 103 and may also perform a method for detecting signal transmission of a vehicle-mounted display screen, where the method for detecting signal transmission of a vehicle-mounted display screen includes: the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are obtained, and the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are generated based on PWM signals sent to the display screen driving module C4; if the feedback signal is 0, obtaining output results of the first to fourth judging units; if the first to fourth judging units are all 0, determining that the driving cable is in a short circuit state between the first acquisition point 1 and the second acquisition point 2; if the first to fourth judging units are not 0, obtaining an output result of the fifth judging unit A5 and an output result of the sixth judging unit A6; if the output result of the fifth judging unit A5 is 1 and the output result of the sixth judging unit A6 is X, determining that the driving cable is in an open circuit state between the third collecting point 3 and the fourth collecting point 4; if the output result of the fifth judging unit A5 is 1 and the output result of the sixth judging unit A6 is 1, determining that the driving cable is in a short circuit state or an open circuit state between the second collecting point 2 and the third collecting point 3 or in a short circuit state between the third collecting point 3 and the fourth collecting point 4; if the output result of the fifth judging unit A5 is X and the output result of the sixth judging unit A6 is 1, it is determined that the driving cable is in an open state between the first collecting point 1 and the second collecting point 2.

Further, the logic instructions in the memory 103 may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In another aspect, an embodiment of the present invention further provides a computer program product, where the computer program product includes a computer program stored on a non-transitory computer readable storage medium, where the computer program includes program instructions, when the program instructions are executed by a computer, for executing the method for detecting signal transmission of an on-vehicle display screen provided by the above embodiments of the method, where the method for detecting signal transmission of an on-vehicle display screen includes: the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are obtained, and the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are generated based on the driving signals sent to the display screen driving module C4; based on the output results of the first to sixth judging units and the feedback signal of the display screen driving module C4, a detection result is output, and the detection result is used for representing the state of the driving cable.

An embodiment of the present invention further provides a computer program product, including a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, which when executed by a computer, can perform the method for detecting signal transmission of a vehicle display screen provided by the above method embodiments, where the method for detecting signal transmission of a vehicle display screen includes: the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are obtained, and the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are generated based on PWM signals sent to the display screen driving module C4; if the feedback signal is 0, obtaining output results of the first to fourth judging units; if the first to fourth judging units are all 0, determining that the driving cable is in a short circuit state between the first acquisition point 1 and the second acquisition point 2; if the first to fourth judging units are not 0, obtaining an output result of the fifth judging unit A5 and an output result of the sixth judging unit A6; if the output result of the fifth judging unit A5 is 1 and the output result of the sixth judging unit A6 is X, determining that the driving cable is in an open circuit state between the third collecting point 3 and the fourth collecting point 4; if the output result of the fifth judging unit A5 is 1 and the output result of the sixth judging unit A6 is 1, determining that the driving cable is in a short circuit state or an open circuit state between the second collecting point 2 and the third collecting point 3 or in a short circuit state between the third collecting point 3 and the fourth collecting point 4; if the output result of the fifth judging unit A5 is X and the output result of the sixth judging unit A6 is 1, it is determined that the driving cable is in an open state between the first collecting point 1 and the second collecting point 2.

In still another aspect, an embodiment of the present invention further provides a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, is implemented to perform the method for detecting signal transmission of a vehicle display screen provided in the foregoing embodiments, where the method for detecting signal transmission of a vehicle display screen includes: the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are obtained, and the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are generated based on the driving signals sent to the display screen driving module C4; based on the output results of the first to sixth judging units and the feedback signal of the display screen driving module C4, a detection result is output, and the detection result is used for representing the state of the driving cable.

The embodiment of the invention also provides a non-transitory computer readable storage medium, on which a computer program is stored, the computer program being implemented when being executed by a processor to perform the method for detecting signal transmission of a vehicle-mounted display screen provided in the above embodiments, where the method for detecting signal transmission of a vehicle-mounted display screen includes: the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are obtained, and the output results of the first judgment unit, the second judgment unit and the feedback signal of the display screen driving module C4 are generated based on PWM signals sent to the display screen driving module C4; if the feedback signal is 0, obtaining output results of the first to fourth judging units; if the first to fourth judging units are all 0, determining that the driving cable is in a short circuit state between the first acquisition point 1 and the second acquisition point 2; if the first to fourth judging units are not 0, obtaining an output result of the fifth judging unit A5 and an output result of the sixth judging unit A6; if the output result of the fifth judging unit A5 is 1 and the output result of the sixth judging unit A6 is X, determining that the driving cable is in an open circuit state between the third collecting point 3 and the fourth collecting point 4; if the output result of the fifth judging unit A5 is 1 and the output result of the sixth judging unit A6 is 1, determining that the driving cable is in a short circuit state or an open circuit state between the second collecting point 2 and the third collecting point 3 or in a short circuit state between the third collecting point 3 and the fourth collecting point 4; if the output result of the fifth judging unit A5 is X and the output result of the sixth judging unit A6 is 1, it is determined that the driving cable is in an open state between the first collecting point 1 and the second collecting point 2.

The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a vehicle-mounted display screen signal transmission detection device which characterized in that includes:

a processor;

the display screen driving module is characterized in that the output end of the processor sends PWM signals to the display screen driving module through a driving cable, and a first acquisition point, a second acquisition point, a third acquisition point and a fourth acquisition point are arranged on the driving cable;

the first collecting point and the feedback cable are electrically connected with the first judging unit;

the second judging unit is electrically connected with the second collecting point and the feedback cable;

the third judging unit is electrically connected with the third collecting point and the feedback cable;

The fourth judging unit is electrically connected with the fourth collecting point and the feedback cable;

the first judging unit and the second judging unit are electrically connected with the fifth judging unit;

the third judging unit and the fourth judging unit are electrically connected with the sixth judging unit;

wherein the first to fourth judgment units are or gates, the fifth to sixth judgment units are exclusive or gates, and the processor is configured to determine the state of the driving cable based on the output results of the first to sixth judgment units and the output result of the feedback cable;

the first judging unit is used for processing the driving signal output by the first collecting point and the feedback signal output by the feedback cable, the second judging unit is used for processing the driving signal output by the second collecting point and the feedback signal output by the feedback cable, the third judging unit is used for processing the driving signal output by the third collecting point and the feedback signal output by the feedback cable, the fourth judging unit is used for processing the driving signal output by the fourth collecting point and the feedback signal output by the feedback cable, the fifth judging unit is used for processing the output result of the first judging unit and the output result of the second judging unit, and the sixth judging unit is used for processing the output result of the third judging unit and the output result of the fourth judging unit.

2. The in-vehicle display screen signal transmission detection apparatus according to claim 1, further comprising:

the first end of the serializer is electrically connected with the output end of the processor, the first acquisition point is the output end of the processor, and the second acquisition point is the first end of the serializer;

the first end of the deserializer is electrically connected with the second end of the serializer, the second end of the deserializer is electrically connected with the input end of the display screen driving module, the third acquisition point is the second end of the deserializer, and the fourth acquisition point is the input end of the display screen driving module.

3. The on-vehicle display screen signal transmission detection apparatus according to claim 2, wherein the feedback cable includes:

the first end of the serializer is electrically connected with the feedback end of the processor through the first feedback sub-cable;

the first end of the deserializer is electrically connected with the second end of the serializer through the second feedback sub-cable;

and the feedback end of the display screen driving module is electrically connected with the second end of the deserializer through the third feedback sub-cable.

4. The signal transmission detecting apparatus for an in-vehicle display screen according to claim 3, wherein,

the output end of the processor and the first feedback sub-cable are electrically connected with the input end of the first judging unit;

the first end of the serializer and the first feedback sub-cable are electrically connected with the input end of the second judging unit;

the second end of the deserializer and the third feedback sub-cable are electrically connected with the input end of the third judging unit;

the input end of the display screen driving module is electrically connected with the third feedback sub-cable and the input end of the fourth judging unit.

5. A method for performing signal transmission detection of an in-vehicle display screen using the signal transmission detection apparatus for an in-vehicle display screen according to any one of claims 1 to 4, comprising:

the method comprises the steps of obtaining output results of first to sixth judging units and feedback signals of a display screen driving module, wherein the output results of the first to sixth judging units and the feedback signals of the display screen driving module are generated based on driving signals sent to the display screen driving module;

and outputting a detection result based on the output results of the first to sixth judging units and the feedback signal of the display screen driving module, wherein the detection result is used for representing the state of the driving cable.

6. The method for detecting signal transmission of an in-vehicle display screen according to claim 5, wherein the outputting of the detection result based on the output results of the first to sixth judging units and the feedback signal of the display screen driving module includes:

if the output result of the first judging unit is 0, the output result of the second judging unit is 0, the output result of the third judging unit is 0, the output result of the fourth judging unit is 0, and the feedback signal is 0, determining that the driving cable is in a short circuit state between the first collecting point and the second collecting point;

if the output result of the first judging unit is a square wave, the output result of the second judging unit is a square wave, the output result of the third judging unit is 0, the output result of the fourth judging unit is 0, the output result of the fifth judging unit is 1, the output result of the sixth judging unit is 1, and the feedback signal is 0, determining that the driving cable is in a short circuit state or an open circuit state between the second collecting point and the third collecting point, or in a short circuit state between the third collecting point and the fourth collecting point;

If the output result of the first judging unit is a square wave, the output result of the second judging unit is 0, the output result of the third judging unit is 0, the output result of the fourth judging unit is 0, the output result of the fifth judging unit is X, the output result of the sixth judging unit is 1, and the feedback signal is 0, determining that the driving cable is in an open circuit state between the first collecting point and the second collecting point;

if the output result of the first judging unit is a square wave, the output result of the second judging unit is a square wave, the output result of the third judging unit is a square wave, the output result of the fourth judging unit is 0, the output result of the fifth judging unit is 1, the output result of the sixth judging unit is X, and the feedback signal is 0, it is determined that the driving cable is in an open circuit state between the third collecting point and the fourth collecting point.

7. A system for in-vehicle display screen signal transmission detection using the in-vehicle display screen signal transmission detection apparatus according to claims 1 to 4, comprising:

the display screen driving module is used for displaying the output result of the first judging unit, the output result of the second judging unit and the feedback signal of the display screen driving module, wherein the output result of the first judging unit, the output result of the sixth judging unit and the feedback signal of the display screen driving module are generated based on PWM signals sent to the display screen driving module;

And the output module is used for outputting a detection result based on the output results of the first to sixth judging units and the feedback signal of the display screen driving module, and the detection result is used for representing the state of the driving cable.

8. A method for performing signal transmission detection of an in-vehicle display screen using the signal transmission detection apparatus for an in-vehicle display screen according to any one of claims 1 to 4, comprising:

the method comprises the steps of obtaining output results of first to sixth judging units and feedback signals of a display screen driving module, wherein the output results of the first to sixth judging units and the feedback signals of the display screen driving module are generated based on PWM signals sent to the display screen driving module;

if the feedback signal is 0, obtaining output results of the first to fourth judging units;

if the first to fourth judging units are all 0, determining that the driving cable is in a short circuit state between the first acquisition point and the second acquisition point;

if the first to fourth judging units are not 0, obtaining an output result of the fifth judging unit and an output result of the sixth judging unit;

if the output result of the fifth judging unit is 1 and the output result of the sixth judging unit is X, determining that the driving cable is in an open circuit state between the third acquisition point and the fourth acquisition point;

If the output result of the fifth judging unit is 1 and the output result of the sixth judging unit is 1, determining that the driving cable is in a short circuit state or an open circuit state between the second collecting point and the third collecting point or in a short circuit state between the third collecting point and the fourth collecting point;

and if the output result of the fifth judging unit is X and the output result of the sixth judging unit is 1, determining that the driving cable is in an open circuit state between the first acquisition point and the second acquisition point.

9. A system for in-vehicle display screen signal transmission detection using the in-vehicle display screen signal transmission detection apparatus according to any one of claims 1 to 4, comprising:

the first acquisition unit is used for acquiring output results of the first judgment unit, the second judgment unit and feedback signals of the display screen driving module, wherein the output results of the first judgment unit, the second judgment unit and the feedback signals of the display screen driving module are generated based on PWM signals sent to the display screen driving module;

the second acquisition unit is used for acquiring output results of the first to fourth judgment units if the feedback signal is 0;

A first determining unit configured to determine that the driving cable is in a short-circuit state between the first acquisition point and the second acquisition point if the first to fourth judging units are all 0;

a third obtaining unit, configured to obtain an output result of the fifth judging unit and an output result of the sixth judging unit if the first to fourth judging units are not all 0;

the second determining unit is configured to determine that the driving cable is in an open-circuit state between the third acquisition point and the fourth acquisition point if the output result of the fifth determining unit is 1 and the output result of the sixth determining unit is X;

a third determining unit, configured to determine that the driving cable is in a short-circuit state or an open-circuit state between the second acquisition point and the third acquisition point, or in a short-circuit state between the third acquisition point and the fourth acquisition point, if the output result of the fifth determining unit is 1 and the output result of the sixth determining unit is 1;

and the fourth determining unit is used for determining that the driving cable is in an open circuit state between the first acquisition point and the second acquisition point if the output result of the first judging unit is X and the output result of the second judging unit is 1.

10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor performs the steps of the method for in-vehicle display screen signal transmission detection as claimed in any one of claims 5, 6 and 8 when the program is executed.

11. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, performs the steps of the method of on-board display signal transmission detection according to any one of claims 5, 6 and 8.