Method, device, system and equipment for automatic regulation of operating current of projector light source

Abstract

The application relates to a method, device, system and equipment for automatically regulating the running current of a projector light source. The method automatically regulates the running current of the projector light source according to the curve change rate of a brightness change curve to determine whether the projector light source is working in a similar saturation state. The driving current of the projector light source working in the similar saturation state is adjusted, that is, the corresponding driving current is matched according to the actual brightness value of the projector, the driving current of the projector light source working in the similar saturation state is reduced, the projector light source is prevented from working in the similar saturation state, the electro-optical conversion efficiency of the projector light source is kept in a high state, the energy consumption of the projector is reduced, the heat generated by the projector light source is reduced, the service life of the projector is prolonged, and the problem that the projector with multiple light sources in parallel working in the similar saturation state after a fault occurs, the output current cannot be adjusted according to the working light source, and the service life of the projector is reduced is solved.

Description

Technical Field

[0001] This application relates to the field of video wall light source technology, and in particular to an automatic control method, device, system and equipment for the operating current of a projector light source. Background Technology

[0002] DLP video walls use projectors that emit light from a light source. Their working principle involves converting electrical signals into light signals to display an image. Because projectors require high brightness, their light sources utilize high-power devices. Currently, the mainstream light sources include LED and laser light sources. Since the power of a single light source is relatively low, multiple light sources are typically connected in parallel to increase their power. The advantage of parallel connection is that if one or more light sources fail, the remaining light sources will continue to emit light, unaffecting the displayed image; the disadvantage is that it's difficult to detect the faulty light source in a timely manner.

[0003] Because the drive output current of a projector is constant, when one light source fails and disconnects, the current applied to the remaining light sources increases. This not only increases the risk of these light sources burning out but also reduces their lifespan. In projectors, to improve brightness, the constant drive output current is typically set to the maximum allowable current for the light source. However, the brightness of a light source is not linearly related to its drive current. Once the current reaches a certain level, further increases result in minimal or no change in the projector's light source brightness—a state similar to saturation. When an LED light source operates in this saturation state, it experiences high power consumption, low efficiency, and high heat generation, leading to both low efficiency and a reduced lifespan. Summary of the Invention

[0004] This application provides an automatic control method, device, system, and equipment for the operating current of a projector light source, which solves the technical problem that existing projectors with multiple light sources connected in parallel operate in a saturated state after a failure, and cannot adjust the output current according to the working light source, thus reducing the service life of the projector.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] An automatic control method for the operating current of a projector light source includes the following steps:

[0007] Obtain the brightness change curve of the projector light source under the same unit increase in driving current;

[0008] The curve change rate is obtained based on the brightness change curve. If the curve change rate is less than the change threshold, the projector light source is working in a state similar to saturation. At the same time, the first brightness value of the projector light source working in a state similar to saturation is obtained.

[0009] The first driving current is obtained from a preset current-brightness lookup table based on the first brightness value, and the operation of the projector light source is controlled based on the first driving current to reduce the driving current of the projector light source.

[0010] Preferably, the automatic control method for the operating current of the projector light source includes: if the rate of change of the curve is not less than the change threshold, the projector light source is operating in a non-saturated state, and it is determined whether the projector light source has malfunctioned.

[0011] Preferably, determining whether the projector light source has malfunctioned includes:

[0012] At each time interval t, the second brightness value of the projector light source and the second driving current corresponding to the second brightness value are acquired in real time.

[0013] The corresponding preset brightness value is obtained from the current brightness lookup table according to the second driving current, and the brightness difference is determined by comparing the second brightness value with the preset brightness value.

[0014] If the brightness difference is greater than a preset threshold, at least three drive currents with different values ​​greater than the second drive current are used to control the operation of the projector light source, and the light source brightness value corresponding to the drive current is obtained.

[0015] By comparing each of the light source brightness values ​​with the second brightness value, a corresponding variable brightness value is obtained. If all the variable brightness values ​​are greater than the variable threshold, then at least one light source of the projector has malfunctioned.

[0016] Preferably, the automatic control method for the operating current of the projector light source is characterized by comprising: if any of the variable brightness values ​​is not greater than a variable threshold or if the brightness difference is not greater than a preset threshold, then monitoring the brightness of the projector light source in real time at intervals t.

[0017] Preferably, the automatic control method for the operating current of the projector light source includes: triggering an alarm report if at least one light source of the projector fails.

[0018] This application also provides an automatic control device for the operating current of a projector light source, including a curve acquisition module, a data acquisition module, and a current control module;

[0019] The curve acquisition module is used to acquire the brightness change curve of the projector light source under the condition of increasing the same unit driving current;

[0020] The data acquisition module is used to obtain the curve change rate according to the brightness change curve. If the curve change rate is less than the change threshold, the projector light source is working in a similar saturation state. At the same time, the first brightness value of the projector light source working in a similar saturation state is obtained.

[0021] The current regulation module is used to obtain the corresponding first driving current from a preset current-brightness lookup table according to the first brightness value, and control the operation of the projector light source according to the first driving current to reduce the driving current of the projector light source.

[0022] Preferably, the automatic control device for the operating current of the projector light source includes a fault judgment module, which includes a data acquisition submodule, a search submodule, a first judgment submodule, and a second judgment submodule.

[0023] The data acquisition submodule is used to acquire the second brightness value of the projector light source and the second driving current corresponding to the second brightness value in real time at each time interval t.

[0024] The lookup submodule is used to obtain a corresponding preset brightness value from the current brightness lookup table according to the second driving current, and to determine the brightness difference by comparing the second brightness value with the preset brightness value.

[0025] The first judgment submodule is used to control the operation of the projector light source by using at least three drive currents that are different values ​​larger than the second drive current, based on the brightness difference being greater than a preset threshold, and to obtain the light source brightness value corresponding to the drive current.

[0026] The second judgment submodule is used to compare the brightness values ​​of all the light sources one by one with the second brightness value to obtain the corresponding variable brightness value. If all the variable brightness values ​​are greater than the variable threshold, then at least one light source of the projector has failed.

[0027] Preferably, the fault judgment module is further configured to monitor the brightness of the projector light source in real time at intervals t, based on the fact that any one of the variable brightness values ​​is not greater than the variable threshold or the brightness difference is not greater than a preset threshold.

[0028] This application also provides an automatic control system for the operating current of a projector light source, including a control module and a detection module, an alarm module and a drive module connected to the control module, wherein the drive module and the detection module are both connected to the projector light source;

[0029] The detection module is used to detect the brightness of the projector's light source using a brightness sensor;

[0030] The control module is used to control the operation of the drive module and the alarm module according to the brightness detected by the detection module and the automatic adjustment method of the projector light source operating current described above.

[0031] The driving module is used to output driving current to provide the projector light source;

[0032] The alarm module is used to issue an alarm via a horn or buzzer.

[0033] This application also provides a terminal device, including a processor and a memory;

[0034] The memory is used to store program code and transmit the program code to the processor;

[0035] The processor is used to execute the automatic control method for the operating current of the projector light source as described above, according to the instructions in the program code.

[0036] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: the automatic control method, device, system and equipment for the operating current of the projector light source, the method includes obtaining the brightness change curve of the projector light source under the condition of increasing the driving current by the same unit; obtaining the curve change rate according to the brightness change curve, if the curve change rate is less than the change threshold, the projector light source is working in a state similar to saturation, and at the same time obtaining the first brightness value of the projector light source working in a state similar to saturation; obtaining the corresponding first driving current from a preset current brightness lookup table according to the first brightness value, and controlling the operation of the projector light source according to the first driving current to reduce the driving current of the projector light source. This automatic current control method for the projector's light source determines whether the projector's light source is operating in a near-saturation state based on the rate of change of the brightness curve. It adjusts the drive current when the light source is operating in a near-saturation state, matching the actual brightness value of the projector to the corresponding drive current. This reduces the drive current when the light source is operating in a near-saturation state, preventing the light source from consistently operating in this state and maintaining a high electro-optical conversion efficiency. This not only reduces energy consumption but also decreases heat generated by the light source, gradually extending the projector's lifespan. It solves the technical problem of existing projectors with multiple parallel light sources operating in a near-saturation state after a malfunction, failing to adjust the output current according to the operating light source, thus reducing the projector's lifespan. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating the steps of the automatic control method for the operating current of the projector light source according to an embodiment of this application.

[0039] Figure 2 This is a diagram showing the relationship between current and brightness in the automatic control method for the operating current of the projector light source described in the embodiments of this application.

[0040] Figure 3 This is a frame diagram of the automatic control device for the operating current of the projector light source described in the embodiments of this application;

[0041] Figure 4 This is a framework diagram of an automatic control system for the operating current of a projector light source according to an embodiment of this application. Detailed Implementation

[0042] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] This application provides an automatic control method, device, system, and equipment for the operating current of a projector light source, which solves the technical problem that existing projectors with multiple light sources connected in parallel operate in a saturated state after a failure, and cannot adjust the output current according to the working light source, thus reducing the service life of the projector.

[0044] Example 1:

[0045] Figure 1 This is a flowchart illustrating the steps of the automatic control method for the operating current of the projector light source according to an embodiment of this application. Figure 2 This is a diagram showing the relationship between current and brightness in the automatic control method for the operating current of the projector light source described in this application embodiment.

[0046] like Figure 1 As shown in the figure, this application embodiment provides an automatic control method for the operating current of a projector light source, including the following steps:

[0047] S1. Obtain the brightness change curve of the projector light source under the condition of increasing the same unit driving current.

[0048] It should be noted that in step S1, the brightness detected by the brightness sensor at different driving currents is obtained, and a brightness variation curve is plotted based on the brightness and current. In this embodiment, the brightness variation curve is constructed with current as the abscissa and brightness value as the ordinate. The brightness variation curve is constructed by a series of different current values ​​with equal arithmetic or equal summation and their corresponding brightness values. The projector light source can be an LED lamp.

[0049] S2. Obtain the curve change rate based on the brightness change curve. If the curve change rate is less than the change threshold, the projector light source is working in a state similar to saturation. At the same time, obtain the first brightness value of the projector light source working in a state similar to saturation.

[0050] It should be noted that in step S2, firstly, the curve change rate is obtained based on the brightness change curve; secondly, the working state of the projector light source is determined based on the curve change rate to determine whether it is in a near-saturation state, and the first brightness value of the projector light source in a near-saturation state is obtained. In this embodiment, the curve change rate can be the ratio of the change in two brightness values ​​to the corresponding change in current, or it can be the average of the ratios of the changes in all two adjacent brightness values ​​to the corresponding changes in current in the brightness change curve. The change threshold can be set according to requirements.

[0051] S3. Obtain the corresponding first driving current from the preset current brightness lookup table according to the first brightness value, and control the operation of the projector light source according to the first driving current to reduce the driving current of the projector light source.

[0052] It should be noted that in step S3, firstly, the first driving current corresponding to the first brightness value is obtained; secondly, the first driving current is used as the driving current for the projector light source to operate. This achieves matching the driving current according to the actual brightness value of the projector, reducing the driving current of the projector light source from operating in a near-saturation state. This avoids the projector light source operating in a consistently near-saturation state, keeping the electro-optical conversion efficiency of the projector light source at a high level. This not only helps reduce the energy consumption of the projector but also reduces the heat generated by the projector light source. Since heat is a key factor limiting the lifespan of the projector light source, and the lifespan of the projector light source is one of the main factors affecting the lifespan of the projector, this automatic adjustment method of the projector light source operating current helps extend the overall lifespan of the projector. In this embodiment, controlling the operation of the projector light source based on the first driving current ensures that the projector light source operates in a non-saturated state.

[0053] like Figure 2As shown in the embodiments of this application, the current-brightness lookup table is a table constructed by extracting data from different current values ​​and their corresponding brightness relationships.

[0054] This application provides an automatic control method for the operating current of a projector light source. The method includes acquiring a brightness change curve of the projector light source under the condition of increasing the driving current by the same unit; acquiring the curve change rate based on the brightness change curve; if the curve change rate is less than a change threshold, the projector light source is operating in a state similar to saturation, and acquiring a first brightness value of the projector light source operating in a state similar to saturation; acquiring the corresponding first driving current from a preset current-brightness lookup table based on the first brightness value; and controlling the operation of the projector light source based on the first driving current to reduce the driving current of the projector light source. This automatic current control method for the projector's light source determines whether the projector's light source is operating in a near-saturation state based on the rate of change of the brightness curve. It adjusts the drive current when the light source is operating in a near-saturation state, matching the actual brightness value of the projector to the corresponding drive current. This reduces the drive current when the light source is operating in a near-saturation state, preventing the light source from consistently operating in this state and maintaining a high electro-optical conversion efficiency. This not only reduces energy consumption but also decreases heat generated by the light source, gradually extending the projector's lifespan. It solves the technical problem of existing projectors with multiple parallel light sources operating in a near-saturation state after a malfunction, failing to adjust the output current according to the operating light source, thus reducing the projector's lifespan.

[0055] In one embodiment of this application, the automatic control method for the operating current of the projector light source includes: S4. If the rate of change of the curve is not less than the change threshold, the projector light source is operating in a non-saturated state, and it is determined whether the projector light source has malfunctioned.

[0056] It should be noted that the automatic adjustment method for the projector's light source operating current also determines whether there is a light source malfunction in the projector if the light source is operating in a non-saturated state.

[0057] Furthermore, determining whether the projector light source is malfunctioning includes:

[0058] At each time interval t, the second brightness value of the projector light source and the second driving current corresponding to the second brightness value are acquired in real time.

[0059] The corresponding preset brightness value is obtained from the current brightness lookup table based on the second driving current, and the brightness difference is determined by comparing the second brightness value with the preset brightness value.

[0060] If the brightness difference is greater than the preset threshold, at least three drive currents with different values ​​greater than the second drive current are used to control the operation of the projector light source and obtain the light source brightness value of the corresponding drive current.

[0061] By comparing the brightness values ​​of all light sources one by one with the second brightness value, the corresponding variable brightness value is obtained. If all variable brightness values ​​are greater than the variable threshold, then at least one light source of the projector has failed.

[0062] If any variable brightness value is not greater than the variable threshold or if the brightness difference is not greater than the preset threshold, then the brightness of the projector light source is monitored in real time at intervals t.

[0063] It should be noted that in determining whether a projector light source has malfunctioned, the process involves: firstly, acquiring a second brightness value and its corresponding second driving current, and comparing it with the second brightness value corresponding to the second driving current value in a current-brightness lookup table; then, determining whether the difference between the second brightness value and a preset brightness value is less than a preset threshold. If the brightness difference is not greater than the preset threshold, the brightness of the projector light source is monitored in real time at intervals t. If the brightness difference is greater than the preset threshold, the brightness values ​​of light sources with larger second driving current values ​​are compared with their corresponding second brightness values ​​to obtain the corresponding variable brightness values. The result of comparing the variable brightness values ​​with the variable threshold is then used to determine whether a light source malfunction has occurred in the projector, thus eliminating interference and improving the accuracy of the judgment. In this embodiment, if the brightness of the projector light source changes significantly under multiple different driving current conditions (i.e., the variable brightness value is greater than the variable threshold), it is determined that the projector light source is damaged. An alarm can then be triggered via a buzzer, allowing staff to identify the abnormal operation of the projector light source. In this embodiment, the preset threshold and variable threshold can be set according to requirements and are not specifically limited here.

[0064] In one embodiment of this application, the automatic control method for the operating current of the projector light source includes: triggering an alarm report if at least one light source of the projector fails, thereby indicating that an abnormality has occurred in the projector.

[0065] Example 2:

[0066] Figure 3 This is a frame diagram of an automatic control device for the operating current of a projector light source according to an embodiment of this application.

[0067] like Figure 3 As shown, this application embodiment also provides an automatic control device for the operating current of a projector light source, including a curve acquisition module 10, a data acquisition module 20, and a current control module 30;

[0068] The curve acquisition module 10 is used to acquire the brightness change curve of the projector light source under the condition of increasing the same unit driving current;

[0069] The data acquisition module 20 is used to obtain the curve change rate according to the brightness change curve. If the curve change rate is less than the change threshold, the projector light source is working in a similar saturation state. At the same time, the first brightness value of the projector light source working in a similar saturation state is obtained.

[0070] The current regulation module 30 is used to obtain the corresponding first driving current from a preset current brightness lookup table according to the first brightness value, and control the operation of the projector light source according to the first driving current to reduce the driving current of the projector light source.

[0071] In this embodiment of the application, the automatic control device for the operating current of the projector light source includes a fault judgment module, which includes a data acquisition submodule, a search submodule, a first judgment submodule, and a second judgment submodule.

[0072] The data acquisition submodule is used to acquire the second brightness value of the projector light source and the second driving current corresponding to the second brightness value in real time at each time interval t.

[0073] The lookup submodule is used to obtain the corresponding preset brightness value from the current brightness lookup table based on the second driving current, and to determine the brightness difference by comparing the second brightness value with the preset brightness value.

[0074] The first judgment submodule is used to control the operation of the projector light source by using at least three drive currents that are different values ​​larger than the second drive current, based on the brightness difference being greater than a preset threshold, and to obtain the light source brightness value of the corresponding drive current.

[0075] The second judgment submodule is used to compare the brightness values ​​of all light sources one by one with the second brightness value to obtain the corresponding variable brightness value. If all variable brightness values ​​are greater than the variable threshold, then at least one light source of the projector has failed.

[0076] In this embodiment of the application, the fault judgment module is further configured to monitor the brightness of the projector light source in real time at intervals t, based on the fact that any variable brightness value is not greater than the variable threshold or the brightness difference is not greater than the preset threshold.

[0077] It should be noted that the modules in the device of Embodiment 2 correspond to the steps in the method of Embodiment 1. The content of the automatic control method of the projector light source operating current has been described in detail in Embodiment 1, and the content of the modules in the device will not be described in detail in this Embodiment 2.

[0078] Example 3:

[0079] Figure 4 This is a framework diagram of an automatic control system for the operating current of a projector light source according to an embodiment of this application.

[0080] like Figure 4As shown, this application embodiment provides an automatic control system for the operating current of a projector light source, including a control module 100 and a detection module 200, an alarm module 300 and a drive module 400 connected to the control module 100. The drive module 400 and the detection module 200 are both connected to the projector light source 500.

[0081] The detection module 200 is used to detect the brightness of the projector's light source through a brightness sensor;

[0082] The control module 100 is used to control the drive module 400 and the alarm module 300 to operate according to the brightness detected by the detection module 200 and the automatic adjustment method of the projector light source operating current described above.

[0083] The driver module 400 is used to output drive current to the projector light source 500;

[0084] Alarm module 300 is used to issue an alarm via a horn or buzzer.

[0085] It should be noted that the automatic control method of the projector light source operating current in the system of Embodiment 2 has been described in detail in Embodiment 1, and the automatic control method of the projector light source operating current will not be described in detail in this Embodiment 2.

[0086] Example 4:

[0087] This application provides a terminal device, including a processor and a memory;

[0088] Memory is used to store program code and transfer the program code to the processor;

[0089] The processor is used to execute the above-mentioned automatic control method for the operating current of the projector light source according to the instructions in the program code.

[0090] It should be noted that the processor is used to execute the steps in the above-described embodiment of an automatic control method for the operating current of a projector light source according to the instructions in the program code. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the above-described system / device embodiments.

[0091] For example, a computer program can be divided into one or more modules / units, one or more of which are stored in memory and executed by a processor to complete this application. One or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in a terminal device.

[0092] Terminal devices can be computing devices such as desktop computers, laptops, handheld computers, and cloud servers. Terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will understand that this does not constitute a limitation on the terminal device, which may include more or fewer components than illustrated, or combinations of certain components, or different components. For example, a terminal device may also include input / output devices, network access devices, buses, etc.

[0093] The processor referred to can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0094] Memory can be an internal storage unit of a terminal device, such as a hard drive or RAM. Memory can also be an external storage device, such as a plug-in hard drive, SmartMedia Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, memory can include both internal and external storage units. Memory is used to store computer programs and other programs and data required by the terminal device. Memory can also be used to temporarily store data that has been output or will be output.

[0095] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0096] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0097] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0098] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0099] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0100] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An automatic control method for the operating current of a projector light source, characterized in that, Includes the following steps: Obtain the brightness change curve of the projector light source under the same unit increase in driving current; The curve change rate is obtained based on the brightness change curve. If the curve change rate is less than the change threshold, the projector light source is working in a state similar to saturation. At the same time, the first brightness value of the projector light source working in a state similar to saturation is obtained. The first driving current is obtained from a preset current-brightness lookup table based on the first brightness value, and the operation of the projector light source is controlled based on the first driving current to reduce the driving current of the projector light source.

2. The automatic control method for the operating current of the projector light source according to claim 1, characterized in that, include: If the rate of change of the curve is not less than the change threshold, the projector light source is operating in a non-saturated state, and it is determined whether the projector light source has malfunctioned.

3. The automatic control method for the operating current of the projector light source according to claim 2, characterized in that, Determining whether a projector's light source is malfunctioning includes: At each time interval t, the second brightness value of the projector light source and the second driving current corresponding to the second brightness value are acquired in real time. The corresponding preset brightness value is obtained from the current brightness lookup table according to the second driving current, and the brightness difference is determined by comparing the second brightness value with the preset brightness value. If the brightness difference is greater than a preset threshold, at least three drive currents with different values ​​greater than the second drive current are used to control the operation of the projector light source, and the light source brightness value corresponding to the drive current is obtained. By comparing each of the light source brightness values ​​with the second brightness value, a corresponding variable brightness value is obtained. If all the variable brightness values ​​are greater than the variable threshold, then at least one light source of the projector has malfunctioned.

4. The automatic control method for the operating current of the projector light source according to claim 3, characterized in that, include: If any of the variable brightness values ​​is not greater than the variable threshold or if the brightness difference is not greater than the preset threshold, then the brightness of the projector light source is monitored in real time at intervals t.

5. The automatic control method for the operating current of the projector light source according to claim 3, characterized in that, include: An alarm is triggered if at least one light source of the projector malfunctions.

6. An automatic control device for the operating current of a projector light source, characterized in that, It includes a curve acquisition module, a data acquisition module, and a current regulation module; The curve acquisition module is used to acquire the brightness change curve of the projector light source under the condition of increasing the same unit driving current; The data acquisition module is used to obtain the curve change rate according to the brightness change curve. If the curve change rate is less than the change threshold, the projector light source is working in a similar saturation state. At the same time, the first brightness value of the projector light source working in a similar saturation state is obtained. The current regulation module is used to obtain the corresponding first driving current from a preset current-brightness lookup table according to the first brightness value, and control the operation of the projector light source according to the first driving current to reduce the driving current of the projector light source.

7. The automatic control device for the operating current of the projector light source according to claim 6, characterized in that, The system includes a fault diagnosis module, which comprises a data acquisition submodule, a search submodule, a first judgment submodule, and a second judgment submodule. The data acquisition submodule is used to acquire the second brightness value of the projector light source and the second driving current corresponding to the second brightness value in real time at each time interval t. The lookup submodule is used to obtain a corresponding preset brightness value from the current brightness lookup table according to the second driving current, and to determine the brightness difference by comparing the second brightness value with the preset brightness value. The first judgment submodule is used to control the operation of the projector light source by using at least three driving currents that are different values ​​larger than the second driving current, based on the brightness difference being greater than a preset threshold, and to obtain the light source brightness value corresponding to the driving current. The second judgment submodule is used to compare the brightness values ​​of all the light sources one by one with the second brightness value to obtain the corresponding variable brightness value. If all the variable brightness values ​​are greater than the variable threshold, then at least one light source of the projector has failed.

8. The automatic control device for the operating current of the projector light source according to claim 7, characterized in that, The fault judgment module is also used to monitor the brightness of the projector light source in real time at intervals t, based on the fact that any one of the variable brightness values ​​is not greater than the variable threshold or the brightness difference is not greater than the preset threshold.

9. An automatic control system for the operating current of a projector light source, characterized in that, It includes a control module and a detection module, an alarm module and a drive module connected to the control module, wherein the drive module and the detection module are both connected to the projector light source; The detection module is used to detect the brightness of the projector's light source using a brightness sensor; The control module is used to control the operation of the drive module and the alarm module according to the brightness detected by the detection module and the automatic adjustment method of the projector light source operating current as described in any one of claims 1-5. The driving module is used to output driving current to provide the projector light source; The alarm module is used to issue an alarm via a horn or buzzer.

10. A terminal device, characterized in that, Including the processor and memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the automatic control method for the operating current of the projector light source as described in any one of claims 1-5, according to the instructions in the program code.

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