Pwm monitoring device, system and method

Abstract

The application discloses a PWM monitoring device, system and method, and belongs to the technical field of display screen control.The application is characterized in that a back-reading module, a control module and a backlight module are arranged in the PWM monitoring device, the back-reading module is connected with the control module and the backlight module respectively, and the control module is further connected with the backlight module; the control module is used for outputting a set PWM signal to the backlight module for storage; the back-reading module is used for reading a PWM signal parameter in the backlight module and transmitting the PWM signal parameter to the control module; and the control module is further used for comparing the PWM signal parameter with a preset PWM signal parameter range, so as to monitor the PWM signal in the backlight module, the PWM signal is read back through the back-reading module, real-time monitoring of the PWM signal is realized, the display screen adjusting effect is improved, and the functional safety requirement is met.

Description

Technical Field

[0001] This invention relates to the field of display screen control technology, and in particular to a PWM monitoring device, system and method. Background Technology

[0002] In display control systems, backlight power supplies are mostly controlled by PWM (Pulse Width Modulation), which outputs different voltages to the screen to adjust the screen's brightness.

[0003] However, the influence of the PWM signal was not taken into account when adjusting the brightness of the display screen, which resulted in black screen or screen flickering during brightness adjustment. Frequent black screen or screen flickering cannot meet the functional safety requirements. Summary of the Invention

[0004] The main objective of this invention is to provide a PWM monitoring device, system, and method, which aims to solve the technical problem of poor performance when adjusting the brightness of a display screen in the prior art.

[0005] To achieve the above objectives, the present invention provides a PWM monitoring device, which includes: a readback module, a control module, and a backlight module. The readback module is connected to the control module and the backlight module, respectively, and the control module is also connected to the backlight module.

[0006] The control module is used to output the set PWM signal to the backlight module for storage;

[0007] The readback module is used to read the PWM signal parameters in the backlight module and transmit the PWM signal parameters to the control module;

[0008] The control module is also used to compare the PWM signal parameters with a preset PWM signal parameter range in order to monitor the PWM signal in the backlight module.

[0009] Optionally, the PWM monitoring device further includes: a data acquisition module, which is connected to the output terminal of the backlight module and the control module respectively;

[0010] The backlight module is also used to output a corresponding output voltage based on the received PWM signal;

[0011] The acquisition module is used to acquire the output voltage of the backlight module and transmit the acquired output voltage to the control module;

[0012] The control module is also used to compare the output voltage with a preset output voltage range in order to monitor the output voltage of the backlight module.

[0013] Optionally, the control module is further configured to establish a first mapping relationship between the PWM signal and the output voltage, and generate a first mapping table.

[0014] Optionally, the control module is further configured to query the first mapping table based on the received output voltage to obtain the corresponding PWM signal, so as to monitor the PWM signal through the output voltage.

[0015] Optionally, the control module is further configured to output a duty cycle adjustment signal to the backlight module when the output voltage exceeds the preset output voltage range;

[0016] The backlight module is also used to adjust the PWM signal according to the duty cycle adjustment signal to obtain the adjusted output voltage.

[0017] Optionally, the PWM monitoring device further includes: a display module, the input terminal of which is connected to the backlight module.

[0018] The backlight module is also used to output the adjustment output voltage to the display module to adjust the display brightness of the display module.

[0019] Optionally, the control module is further configured to establish a second mapping relationship between the display brightness of the display module and the output voltage, and generate a second mapping table;

[0020] The control module is also used to query the second mapping table based on the output voltage to obtain the target display brightness corresponding to the output voltage;

[0021] The control module is also used to generate a duty cycle adjustment signal to the backlight module based on the target display brightness.

[0022] Optionally, the PWM monitoring device further includes: a display module, the input terminal of which is connected to the backlight module.

[0023] The control module is also used to output a duty cycle adjustment signal to the backlight module when the PWM signal parameters exceed the preset PWM signal parameter range;

[0024] The backlight module is also used to adjust the PWM signal according to the duty cycle adjustment signal to obtain an adjusted output voltage, and output the adjusted output voltage to the display module to adjust the display brightness of the display module.

[0025] In addition, to achieve the above objectives, the present invention also proposes a PWM monitoring system, which includes the PWM monitoring device described above.

[0026] Furthermore, to achieve the above objectives, the present invention also proposes a PWM monitoring method, which is applied to the PWM monitoring device described above, and the method includes the following steps:

[0027] The control module outputs the set PWM signal to the backlight module for storage;

[0028] The readback module reads the PWM signal parameters from the backlight module and transmits the PWM signal parameters to the control module;

[0029] The control module compares the PWM signal parameters with a preset PWM signal parameter range to monitor the PWM signal in the backlight module.

[0030] This invention incorporates a readback module, a control module, and a backlight module within a PWM monitoring device. The readback module is connected to both the control module and the backlight module, and the control module is also connected to the backlight module. The control module outputs a preset PWM signal to the backlight module for storage. The readback module reads the PWM signal parameters from the backlight module and transmits these parameters to the control module. The control module further compares the PWM signal parameters with a preset PWM signal parameter range to monitor the PWM signal in the backlight module. By reading back the PWM signal through the readback module, real-time monitoring of the PWM signal is achieved, meeting functional safety requirements. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the first embodiment of the PWM monitoring device of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the second embodiment of the PWM monitoring device of the present invention;

[0033] Figure 3 This is a schematic diagram of the fourth embodiment of the PWM monitoring device of the present invention;

[0034] Figure 4 This is a flowchart illustrating the first embodiment of the PWM monitoring method of the present invention.

[0035] Explanation of icon numbers:

[0036] 10 Readback module 40 Data Acquisition Module 20 Control module 50 Display module 30 Backlight module

[0037] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0039] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the PWM monitoring device of the present invention.

[0040] In this embodiment, the PWM monitoring device includes: a readback module 10, a control module 20, and a backlight module 30. The readback module 10 is connected to the control module 20 and the backlight module 30, respectively, and the control module 20 is also connected to the backlight module 30.

[0041] It should be noted that the readback module 10 is connected to both the control module 20 and the backlight module 30. The readback module 10 can receive control commands or signals from the control module 20, and it can also send the acquired data to the control module 20. The readback module 10 can also read data from the backlight module.

[0042] In this embodiment, the control module 20 is used to output the set PWM signal to the backlight module 30 for storage.

[0043] It should be understood that the set PWM signal can be pre-set by the controller inside the control module 20, and the set PWM signal is sent to the backlight module 30 for storage.

[0044] It should be noted that when the backlight module 30 receives the set PWM signal, it can analyze the PWM signal, obtain the PWM signal parameters, and store the PWM signal parameters.

[0045] The backlight module 30 has an internal register that can store PWM signal parameters.

[0046] In this embodiment, the readback module 10 is used to read the PWM signal parameters in the backlight module 30 and transmit the PWM signal parameters to the control module 20.

[0047] It should be noted that, in order to monitor the PWM signal, a readback module 10 is set up. During monitoring, the readback module 10 reads back the PWM signal parameters stored in the internal register of the backlight module 30, thereby enabling the monitoring of the PWM signal.

[0048] In practice, when monitoring is required, the control module 20 can send a readback command to the readback module 10. The readback module 10 reads the PWM signal parameters in the backlight module 30 according to the received readback command and transmits the read PWM signal parameters to the control module 20.

[0049] The readback module 10 can be used to read the PWM signal parameters previously stored in the backlight module 30 and load them into the control module 20.

[0050] In this embodiment, the control module 20 is further configured to compare the PWM signal parameters with a preset PWM signal parameter range in order to monitor the PWM signal in the backlight module 30.

[0051] It should be understood that after receiving the PWM signal parameters sent by the readback module 10, the control module 20 compares the PWM signal parameters with the preset PWM signal parameter range to determine whether there is a problem with the currently acquired PWM signal parameters, so as to monitor the PWM signal in the backlight module 30.

[0052] This embodiment incorporates a readback module 10, a control module 20, and a backlight module 30 within a PWM monitoring device. The readback module 10 is connected to both the control module 20 and the backlight module 30, and the control module 20 is also connected to the backlight module 30. The control module 20 outputs a preset PWM signal to the backlight module 30 for storage. The readback module 10 reads the PWM signal parameters from the backlight module 30 and transmits these parameters to the control module 20. The control module 20 also compares the PWM signal parameters with a preset PWM signal parameter range to monitor the PWM signal in the backlight module 30. By reading back the PWM signal through the readback module 10, real-time monitoring of the PWM signal is achieved, meeting functional safety requirements.

[0053] Reference Figure 2 , Figure 2 This is a schematic diagram of the structure of the second embodiment of the PWM monitoring device of the present invention.

[0054] Based on the first embodiment described above, the PWM monitoring device in this embodiment further includes: a data acquisition module 40, which is connected to the output terminal of the backlight module 30 and the control module 20 respectively.

[0055] It should be noted that the acquisition module 40 can be an external acquisition device, such as a voltage acquisition device or a current acquisition device, and this embodiment does not limit it.

[0056] The acquisition module 40 is connected to the output terminal of the backlight module 30 and the control module 20, respectively.

[0057] The acquisition module 40 can receive acquisition commands issued by the control module 20, such as acquisition commands for current or voltage.

[0058] In this embodiment, the backlight module 30 is also used to output a corresponding output voltage based on the received PWM signal.

[0059] In a specific implementation, the backlight module 30 is part of a display device, such as a monitor. The backlight module 30 is used to provide the backlight illumination required by the display screen. After receiving the PWM signal, the backlight module 30 will also output the corresponding voltage according to the PWM signal.

[0060] A PWM signal is a periodic digital signal consisting of a high level (usually referred to as the "ON" state) and a low level (usually referred to as the "OFF" state). By adjusting the duration (pulse width) of the high level relative to the entire cycle, the average voltage can be controlled, thereby controlling the brightness.

[0061] When the PWM signal is high, the backlight unit circuit may output a higher voltage or current, making the backlight brighter. When the PWM signal is low, the output voltage or current may decrease, making the backlight dimmer.

[0062] By using PWM signals, the backlight module 30 can adjust the output voltage or current according to different pulse widths, thereby achieving flexible brightness adjustment.

[0063] In this embodiment, the acquisition module 40 is used to acquire the output voltage of the backlight module 30 and transmit the acquired output voltage to the control module 20.

[0064] Since the acquisition module 40 is connected to the output terminal of the backlight module 30, it can acquire the output voltage Vo of the backlight module 30 and transmit the acquired output voltage to the control module 20.

[0065] In this embodiment, the control module 20 is further configured to compare the output voltage with a preset output voltage range in order to monitor the output voltage output by the backlight module 30.

[0066] It should be noted that the control module 20 can also compare the received output voltage with the preset output voltage range, thereby determining whether there is an abnormality in the output voltage based on the comparison result, and further determining whether there is a problem with the PWM signal. By monitoring the output voltage, the PWM signal in the backlight module 30 can be monitored.

[0067] In this embodiment, a data acquisition module 40 is also provided in the PWM monitoring device. The data acquisition module 40 is connected to the output terminal of the backlight module 30 and the control module 20 respectively. The backlight module 30 is also used to output a corresponding output voltage according to the received PWM signal. The data acquisition module 40 is used to acquire the output voltage of the backlight module 30 and transmit the acquired output voltage to the control module 20. The control module 20 is also used to compare the output voltage with a preset output voltage range to monitor the output voltage of the backlight module 30. By using PWM signal readback and output voltage acquisition, a dual closed-loop monitoring is adopted to monitor the PWM signal and improve the monitoring effect.

[0068] Based on the first and second embodiments described above, a third embodiment of the PWM monitoring device of the present invention is proposed.

[0069] In this embodiment, the control module 20 is also used to establish a first mapping relationship between the PWM signal and the output voltage, and to generate a first mapping table.

[0070] It should be noted that the control module 20 may have a storage unit inside, and a first mapping relationship between the PWM signal and the output voltage may be established in advance, generating a first mapping table, and storing the first mapping table in the storage unit.

[0071] In a specific implementation, the control module 20 can acquire historical PWM signals and historical output voltages, and establish a first mapping relationship between the PWM signal and the output voltage based on the historical PWM signals and historical output voltages.

[0072] In a specific implementation, the control module 20 is also used to query the first mapping table based on the received output voltage to obtain the corresponding PWM signal, so as to monitor the PWM signal through the output voltage.

[0073] It should be noted that when the control module 20 receives the output voltage sent by the acquisition module 40, since a first mapping relationship is established between the output voltage and the PWM signal, the PWM signal corresponding to the output voltage can be obtained by querying the first mapping table through the output voltage, and thus monitoring can be performed based on the PWM signal.

[0074] Specifically, the control module 20 can compare the PWM signal obtained through the first mapping table with the preset PWM signal parameter range, thereby realizing the monitoring of the PWM signal.

[0075] As an example, the control module 20 is further configured to output a duty cycle adjustment signal to the backlight module 30 when the output voltage exceeds the preset output voltage range; the backlight module 30 is further configured to adjust the PWM signal according to the duty cycle adjustment signal to obtain an adjusted output voltage.

[0076] It should be understood that when the control module 20 compares the output voltage with the preset output voltage range, if the output voltage exceeds the preset output voltage range, it indicates that the current output voltage does not meet the set output voltage and needs to be adjusted.

[0077] It should be noted that since the output voltage of the backlight module 30 is related to the PWM signal, the output voltage can be adjusted by adjusting the PWM signal. The control module 20 generates a duty cycle adjustment signal to the backlight module 30. The duty cycle adjustment signal can be a signal that adjusts the PWM signal in the backlight module 30 to the target value. Thus, the backlight module 30 is controlled to adjust the PWM signal through the duty cycle adjustment signal, thereby adjusting the output voltage of the backlight module 30 and obtaining the adjusted output voltage.

[0078] The control module 20 described in this embodiment is also used to establish a first mapping relationship between the PWM signal and the output voltage, and generate a first mapping table. By establishing the first mapping relationship between the PWM signal and the output voltage, the PWM can be monitored based on the acquired output voltage, thereby improving the monitoring effect.

[0079] Reference Figure 3 , Figure 3 This is a structural schematic diagram of the fourth embodiment of the PWM monitoring device of the present invention.

[0080] Based on the first, second, and third embodiments described above, the PWM monitoring device in this embodiment further includes a display module 50, the input terminal of which is connected to the backlight module 30.

[0081] It should be noted that the display module 50 can be a display, such as an LCD display. The input terminal of the display module 50 is connected to the backlight module 30, so that it can receive the output voltage output by the backlight module 30.

[0082] In this embodiment, the backlight module 30 is also used to output the adjustment output voltage to the display module 50 to adjust the display brightness of the display module 50.

[0083] It should be noted that after the backlight module 30 adjusts the PWM signal according to the duty cycle adjustment signal, it outputs an adjustment output voltage. Since the backlight module 30 is connected to the display module 50, the adjustment output voltage can be output to the display module 50, thereby adjusting the brightness of the display module 50 by adjusting the output voltage.

[0084] As an example, the control module 20 is further configured to establish a second mapping relationship between the display brightness of the display module 50 and the output voltage, and generate a second mapping table; the control module 20 is further configured to query the second mapping table according to the output voltage to obtain the target display brightness corresponding to the output voltage; the control module 20 is further configured to generate a duty cycle adjustment signal to the backlight module 30 according to the target display brightness.

[0085] In specific implementation, the control module 20 can also establish a second mapping relationship between the display brightness and the output voltage of the display module 50 in advance and generate a second mapping table. By collecting historical display brightness and historical output voltage, a second mapping relationship between display brightness and output voltage can be established based on historical display brightness and historical output voltage, and a second mapping table can be generated.

[0086] In a specific implementation, when the control module 20 receives the output voltage, it can look up the second mapping table according to the output voltage to obtain the target display brightness corresponding to the output voltage in the second mapping table. Thus, the PWM signal is monitored through the target display brightness. Specifically, a duty cycle adjustment signal can be generated according to the target display brightness and sent to the backlight module 30. The backlight module 30 can adjust the output voltage according to the duty cycle adjustment signal, thereby adjusting the display brightness of the backlight module 30 to the target display brightness through the adjusted output voltage.

[0087] The PWM monitoring device in this embodiment further includes: a display module 50, the input terminal of which is connected to the backlight module 30; and a control module 20, which is also used to output the adjustment output voltage to the display module 50 to adjust the display brightness of the display module 50. By adjusting the output voltage, the brightness of the display module 50 can be adjusted to avoid black screen or screen flickering and improve safety.

[0088] Based on the first and fourth embodiments described above, a fifth embodiment of the PWM monitoring device of the present invention is proposed.

[0089] In this embodiment, the control module 20 is further configured to output a duty cycle adjustment signal to the backlight module 30 when the PWM signal parameters exceed the preset PWM signal parameter range;

[0090] The backlight module 30 is also used to adjust the PWM signal according to the duty cycle adjustment signal to obtain an adjusted output voltage, and output the adjusted output voltage to the display module 50 to adjust the display brightness of the display module 50.

[0091] It should be noted that when the PWM signal parameters exceed the preset PWM signal parameter range, it means that the current PWM signal parameters do not meet the set PWM signal parameters and need to be adjusted.

[0092] In practice, when the PWM signal parameters need to be adjusted, the control module 20 generates a duty cycle adjustment signal to the backlight module 30, thereby controlling the backlight module 30 to adjust the current PWM signal and output an adjusted output voltage.

[0093] It should be noted that the backlight module 30 will adjust the output voltage to the display module 50, thereby adjusting the display brightness of the display module 50.

[0094] In this embodiment, the control module 20 is further configured to output a duty cycle adjustment signal to the backlight module 30 when the PWM signal parameters exceed the preset PWM signal parameter range; the backlight module 30 is further configured to adjust the PWM signal according to the duty cycle adjustment signal to obtain an adjusted output voltage, and output the adjusted output voltage to the display module 50 to adjust the display brightness of the display module 50. This can be achieved by real-time monitoring of the PWM signal and timely adjustment when the PWM signal does not conform to the set signal, thereby improving the efficiency of PWM monitoring.

[0095] This invention provides a PWM monitoring method, referring to... Figure 4 , Figure 4 This is a flowchart illustrating the first embodiment of the PWM monitoring method of the present invention. The PWM monitoring method is applied to the PWM monitoring device described above.

[0096] In this embodiment, the PWM monitoring method includes the following steps:

[0097] Step S10: The control module outputs the set PWM signal to the backlight module for storage.

[0098] It should be noted that the readback module is connected to both the control module and the backlight module. The readback module can receive control commands or signals from the control module, and it can also send the acquired data back to the control module. The readback module can also read data from the backlight module.

[0099] It should be understood that the set PWM signal can be preset by the controller inside the control module and then sent to the backlight module for storage.

[0100] It should be noted that after the backlight module receives the set PWM signal, it can analyze the PWM signal, obtain the PWM signal parameters, and store the PWM signal parameters.

[0101] The backlight module has an internal register that can store PWM signal parameters.

[0102] Step S20: The readback module reads the PWM signal parameters in the backlight module and transmits the PWM signal parameters to the control module.

[0103] It should be noted that, in order to monitor the PWM signal, a readback module is set up. During monitoring, the PWM signal parameters stored in the internal register of the backlight module are read back through the readback module, thereby enabling the monitoring of the PWM signal.

[0104] In practice, when monitoring is required, the control module can send a readback command to the readback module. The readback module reads the PWM signal parameters in the backlight module according to the received readback command and transmits the read PWM signal parameters to the control module.

[0105] The readback module can be used to read the PWM signal parameters previously stored in the backlight module and load them into the control module.

[0106] Step S30: The control module compares the PWM signal parameters with a preset PWM signal parameter range to monitor the PWM signal in the backlight module.

[0107] It should be understood that after receiving the PWM signal parameters sent by the readback module, the control module compares the PWM signal parameters with the preset PWM signal parameter range to determine whether there is a problem with the currently acquired PWM signal parameters, so as to monitor the PWM signal in the backlight module.

[0108] In this embodiment, the control module outputs a set PWM signal to the backlight module for storage; the readback module reads the PWM signal parameters from the backlight module and transmits the PWM signal parameters to the control module; the control module compares the PWM signal parameters with a preset PWM signal parameter range to monitor the PWM signal in the backlight module. By reading back the PWM signal through the readback module, real-time monitoring of the PWM signal is achieved, improving the display adjustment effect and meeting functional safety requirements.

[0109] In one embodiment, the PWM monitoring device further includes: a data acquisition module, wherein after the readback module reads the PWM signal parameters in the backlight module and transmits the PWM signal parameters to the control module, the device further includes: the backlight module outputting a corresponding output voltage based on the received PWM signal; the data acquisition module acquiring the output voltage output by the backlight module and transmitting the acquired output voltage to the control module; and the control module comparing the output voltage with a preset output voltage range to monitor the output voltage output by the backlight module.

[0110] In one embodiment, before the control module compares the PWM signal parameters with a preset PWM signal parameter range to monitor the PWM signal in the backlight module, the method further includes: the control module establishing a first mapping relationship between the PWM signal and the output voltage, and generating a first mapping table.

[0111] In one embodiment, after the control module compares the PWM signal parameters with a preset PWM signal parameter range to monitor the PWM signal in the backlight module, the method further includes: the control module queries the first mapping table based on the received output voltage to obtain the corresponding PWM signal, so as to monitor the PWM signal through the output voltage.

[0112] In one embodiment, after the control module compares the PWM signal parameters with a preset PWM signal parameter range to monitor the PWM signal in the backlight module, the method further includes: when the output voltage exceeds the preset output voltage range, the control module outputs a duty cycle adjustment signal to the backlight module; the backlight module adjusts the PWM signal according to the duty cycle adjustment signal to obtain an adjusted output voltage.

[0113] In one embodiment, the PWM monitoring device further includes: a display module: after the backlight module adjusts the PWM signal according to the duty cycle adjustment signal to obtain the adjusted output voltage, the backlight module further includes: the backlight module outputs the adjusted output voltage to the display module to adjust the display brightness of the display module.

[0114] In one embodiment, the control module compares the output voltage with a preset output voltage range to monitor the output voltage of the backlight module. This includes: the control module establishing a second mapping relationship between the display brightness of the display module and the output voltage, and generating a second mapping table; the control module querying the second mapping table based on the output voltage to obtain the target display brightness corresponding to the output voltage; and the control module generating a duty cycle adjustment signal to the backlight module based on the target display brightness to monitor the output voltage of the backlight module.

[0115] After the backlight module adjusts the PWM signal according to the duty cycle adjustment signal to obtain the adjusted output voltage, the system further includes: when the PWM signal parameters exceed the preset PWM signal parameter range, the control module outputs a duty cycle adjustment signal to the backlight module; the backlight module adjusts the PWM signal according to the duty cycle adjustment signal to obtain the adjusted output voltage, and outputs the adjusted output voltage to the display module to adjust the display brightness of the display module.

[0116] Furthermore, this embodiment of the invention also proposes a PWM monitoring system, which includes the PWM monitoring device described above.

[0117] Since this PWM monitoring system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0118] It should be understood that the above are merely illustrative examples and do not constitute any limitation on the technical solutions of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any restrictions on this.

[0119] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this invention. In practical applications, those skilled in the art can select some or all of the workflow to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.

[0120] In addition, for technical details not described in detail in this embodiment, please refer to the PWM monitoring method provided in any embodiment of the present invention, which will not be repeated here.

[0121] Furthermore, it should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0122] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0123] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory (ROM) / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0124] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A PWM monitoring device, characterized in that, The PWM monitoring device includes: a readback module, a control module, and a backlight module. The readback module is connected to the control module and the backlight module respectively. The control module is also connected to the backlight module. The PWM monitoring device further includes: a data acquisition module, which is connected to the output terminal of the backlight module and the control module respectively. The backlight module has an internal register; The control module is used to output a set PWM signal to the backlight module and store the PWM signal parameters in the register; The readback module is used to read the PWM signal parameters in the register and transmit the PWM signal parameters to the control module; The control module is also used to compare the PWM signal parameters with a preset PWM signal parameter range in order to monitor the PWM signal in the backlight module; The backlight module is also used to output a corresponding output voltage based on the received PWM signal; The acquisition module is used to acquire the output voltage of the backlight module and transmit the acquired output voltage to the control module; The control module is also used to compare the output voltage with a preset output voltage range in order to monitor the output voltage of the backlight module. The control module is further configured to establish a first mapping relationship between the PWM signal and the output voltage, and generate a first mapping table. The control module is further configured to query the first mapping table according to the received output voltage to obtain the corresponding PWM signal, so as to monitor the PWM signal through the output voltage.

2. The PWM monitoring device as described in claim 1, characterized in that, The control module is also used to output a duty cycle adjustment signal to the backlight module when the output voltage exceeds the preset output voltage range; The backlight module is also used to adjust the PWM signal according to the duty cycle adjustment signal to obtain the adjusted output voltage.

3. The PWM monitoring device as described in claim 2, characterized in that, The PWM monitoring device further includes a display module, the input terminal of which is connected to the backlight module. The backlight module is also used to output the adjustment output voltage to the display module to adjust the display brightness of the display module.

4. The PWM monitoring device as described in claim 3, characterized in that, The control module is also used to establish a second mapping relationship between the display brightness of the display module and the output voltage, and to generate a second mapping table; The control module is also used to query the second mapping table based on the output voltage to obtain the target display brightness corresponding to the output voltage; The control module is also used to generate a duty cycle adjustment signal to the backlight module based on the target display brightness.

5. The PWM monitoring device as described in claim 1, characterized in that, The PWM monitoring device further includes a display module, the input terminal of which is connected to the backlight module. The control module is also used to output a duty cycle adjustment signal to the backlight module when the PWM signal parameters exceed the preset PWM signal parameter range; The backlight module is also used to adjust the PWM signal according to the duty cycle adjustment signal to obtain an adjusted output voltage, and output the adjusted output voltage to the display module to adjust the display brightness of the display module.

6. A PWM monitoring system, characterized in that, The PWM monitoring system includes the PWM monitoring device according to any one of claims 1 to 5.

7. A PWM monitoring method, characterized in that, The PWM monitoring method is applied to the PWM monitoring device according to any one of claims 1 to 5, and the PWM monitoring method includes: The control module outputs the set PWM signal to the register inside the backlight module for storage; The readback module reads the PWM signal parameters from the register inside the backlight module and transmits the PWM signal parameters to the control module; The control module compares the PWM signal parameters with a preset PWM signal parameter range to monitor the PWM signal in the backlight module. The backlight module outputs a corresponding output voltage based on the received PWM signal; The acquisition module acquires the output voltage of the backlight module and transmits the acquired output voltage to the control module. The control module compares the output voltage with a preset output voltage range to monitor the output voltage of the backlight module. The control module establishes a first mapping relationship between the PWM signal and the output voltage, and generates a first mapping table; The control module queries the first mapping table based on the received output voltage to obtain the corresponding PWM signal, so as to monitor the PWM signal through the output voltage.

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