CN207854222U - A kind of moisture protection system and damp-proof type LED screen - Google Patents
A kind of moisture protection system and damp-proof type LED screen Download PDFInfo
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- CN207854222U CN207854222U CN201721788372.0U CN201721788372U CN207854222U CN 207854222 U CN207854222 U CN 207854222U CN 201721788372 U CN201721788372 U CN 201721788372U CN 207854222 U CN207854222 U CN 207854222U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a kind of moisture protection system and damp-proof type LED screens, are related to light and show technical field.The moisture protection system includes humidity sensor, operation detection module, master controller and LED light.Humidity sensor and operation detection module are connect with master controller, humidity sensor is for detecting ambient humidity and generating humidity data, it runs detection module and is used for detection device power-off time and generated time data, master controller is connect with LED light, the electric current that master controller is used to pass through LED light according to humidity data and time data control.Compared with prior art; moisture protection system provided by the utility model is as a result of the humidity sensor and operation detection module being connect respectively with master controller; so can substantially judge the humidity in LED light according to the humidity of environment and the time of device powers down; to slowly improve the electric current by LED light; it protects LED light without damage, extends the service life of LED light, reduce maintenance cost; security performance is strong, highly practical.
Description
Technical field
The utility model is related to light to show technical field, in particular to a kind of moisture protection system and damp-proof type LED
Screen.
Background technology
Light emitting diode is referred to as LED, it is one kind of semiconductor diode, electric energy can be converted to luminous energy.It shines
Diode is made of, it may have unilateral conduction as the development pipe of common two pole LED chip a PN junction.Now, by
The LED screen that light emitting diode makes has come into huge numbers of families, is widely welcome.
Currently, the cost of small spacing LED screen 60%~70% is in LED light, it is desirable to it is good to use small spacing LED screen, prolong
Its long service life, the maintenance for the later stage of lamp bead is also most important, now results in the master of small spacing LED screen lamp bead failure
It wants the reason is that air humidity.Small spacing LED light belongs to non-airtight SMD devices due to the characteristic of itself, and the general quick grade of tide is
3 grades, when air humidity is larger, moisture can enter along pin holder inside LED light, encounter and be switched under high current, inside LED
Moisture understands rapid expanding (" popcorn effect "), loses adjusting with credit union between the different materials of device, various connections then can
Disadvantageous changes are generated, is layered or bursts so as to cause device glass, cause open failure, dead lamp situation.
In view of this, designing and manufacturing a kind of moisture protection system that can be moisture-proof and damp-proof type LED screen especially exists
It is particularly important in industrial production.
Utility model content
The purpose of this utility model is to provide a kind of moisture protection system, LED light caused by capable of preventing through moisture
Damage, extend the service life of LED light, reduce maintenance cost, security performance is strong, highly practical.
The another object of the utility model is to provide a kind of damp-proof type LED screen, LED caused by capable of preventing through moisture
The damage of lamp extends the service life of LED light, reduces maintenance cost, security performance is strong, highly practical, and user experience is good.
The utility model is realized using technical solution below.
A kind of moisture protection system, including humidity sensor, operation detection module, master controller and LED light, humidity sensor
Device and operation detection module are connect with master controller, and humidity sensor is used to detect ambient humidity and generates humidity data, and
Humidity data is sent to master controller, operation detection module is used for detection device power-off time and generated time data, and will
Time data is sent to master controller, and master controller is connect with LED light, and master controller is used for according to humidity data and time data
The electric current that control passes through LED light.
Further, master controller is used for when time data is less than the first preset value, and control is by the electric current of LED light
First predetermined current.
Further, master controller is used for when time data is between the first preset value and the second preset value, control
Increase to the first predetermined current from the second predetermined current in the first preset time period by the electric current of LED light.
Further, master controller is used to be between the second preset value and third preset value when time data, and humidity
When data are higher than default humidity value, control is increased in the second preset time period from the second predetermined current by the electric current of LED light
To the first predetermined current；Master controller is additionally operable to be between the second preset value and third preset value when time data, and humidity
When data are less than default humidity value, control is increased in third preset time period from the second predetermined current by the electric current of LED light
To the first predetermined current, the second preset time period is more than third preset time period.
Further, master controller is used to be higher than third preset value when time data, and humidity data is higher than default humidity
When value, control increases to the first predetermined current in the 4th preset time period by the electric current of LED light from the second predetermined current；It is main
Controller is additionally operable to when time data is higher than third preset value, and humidity data is less than default humidity value, and control passes through LED light
Electric current increase to the first predetermined current from the second predetermined current in the 5th preset time period, the 4th preset time period is more than the
Five preset time periods.
Further, master controller includes processing module and control module, humidity sensor and operation detection module with
Processing module connects, and processing module is connect by control module with LED light, and processing module is used for according to humidity data and time number
Control instruction, the electric current that control module is used to pass through LED light according to control instruction control are sent out according to control module.
Further, processing module includes reading unit and arithmetic element, and reading unit passes through arithmetic element and control mould
Block connects, and reading unit sends it to arithmetic element for receiving humidity data and time data, arithmetic element for pair
Humidity data and time data carry out judgement handle judged as a result, and according to judgement result generate control instruction, and will control
System instruction is sent to control module.
Further, control module is constant-current driven chip.
Further, operation detection module is RTC charged pool circuits, and RTC charged pool circuits are used in the same of device powers down
When start timing, and stop timing when equipment is once again powered up, and generated time data.
A kind of damp-proof type LED screen, including shell and moisture protection system, moisture protection system is installed in shell, moisture-proof
Protection system includes humidity sensor, runs detection module, master controller and LED light, humidity sensor and operation detection module
It is connect with master controller, humidity data is sent to by humidity sensor for detecting ambient humidity and generating humidity data
Master controller, operation detection module is used for detection device power-off time and generated time data, and time data is sent to master
Controller, master controller are connect with LED light, and master controller is used to pass through LED light according to humidity data and time data control
Electric current.
Moisture protection system and damp-proof type LED screen provided by the utility model have the advantages that：
Moisture protection system provided by the utility model, humidity sensor and operation detection module connect with master controller
It connects, humidity sensor is sent to master controller, operation inspection for detecting ambient humidity and generating humidity data, and by humidity data
It surveys module and is used for detection device power-off time and generated time data, and time data is sent to master controller, master controller
It is connect with LED light, the electric current that master controller is used to pass through LED light according to humidity data and time data control.With the prior art
It compares, moisture protection system provided by the utility model is as a result of the humidity sensor and fortune being connect respectively with master controller
Row detection module, so can substantially judge the humidity in LED light according to the humidity of environment and the time of device powers down, to
The electric current by LED light is slowly improved, protection LED light is without damage, extends the service life of LED light, reduces maintenance cost, peace
Full performance is strong, highly practical.
Damp-proof type LED screen provided by the utility model, including moisture protection system according to the humidity of environment and can be set
The time of standby power-off substantially judges the humidity in LED light, to slowly improve the electric current by LED light, LED light is protected not to be damaged
It is bad, extend the service life of LED light, reduces maintenance cost, security performance is strong, highly practical, and user experience is good.
Description of the drawings
It, below will be to required use in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram for the damp-proof type LED screen that the utility model embodiment provides；
Fig. 2 is the structure composition block diagram for the moisture protection system that the utility model embodiment provides；
Fig. 3 is the curent change figure of LED light when time data is between the first preset value and the second preset value；
Fig. 4 is is between the second preset value and third preset value when time data, and humidity data is higher than default humidity
When value, or when time data is higher than third preset value, and humidity data is less than default humidity value, the curent change of LED light
Figure；
Fig. 5 is is between the second preset value and third preset value when time data, and humidity data is less than default humidity
When value, the curent change figure of LED light；
Fig. 6 is the electric current of LED light when time data is higher than third preset value, and humidity data is higher than default humidity value
Variation diagram；
Fig. 7 is the structure composition block diagram of master controller in Fig. 2.
Icon：10- damp-proof type LED screens；100- moisture protection systems；110- humidity sensors；130- runs detection module；
150- master controllers；151- processing modules；1511- reading units；1513- arithmetic elements；153- control modules；170-LED lamps；
200- shells.
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here described in attached drawing and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiments of the present invention to providing in the accompanying drawings is not intended to limit requirement below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained without creative efforts, all
Belong to the range of the utility model protection.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
In the description of the present invention, it should be noted that the fingers such as term "inner", "outside", "upper", "lower", "horizontal"
The orientation or positional relationship shown is to be based on the orientation or positional relationship shown in the drawings or when utility model product uses is used
The orientation or positional relationship often put, is merely for convenience of describing the present invention and simplifying the description, rather than indicates or imply
Signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as to this
The limitation of utility model.In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, and should not be understood as indicating
Or imply relative importance.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is set
Set ", " connected ", " installation ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection,
Or it is integrally connected；It can be mechanical connection, can also be electrical connection；It can be directly connected, intermediary can also be passed through
It is indirectly connected, can be the connection inside two elements.For the ordinary skill in the art, it can be managed with concrete condition
Solve the concrete meaning of above-mentioned term in the present invention.
Below in conjunction with the accompanying drawings, it elaborates to some embodiments of the utility model.In the absence of conflict, under
Feature in the embodiment stated can be combined with each other.
Embodiment
Fig. 1 is please referred to, the utility model embodiment provides a kind of damp-proof type LED screen 10, is used for luminescence imaging.It can
The damage of internal LED light 170, extends the service life of LED light 170 caused by preventing through moisture, reduces maintenance cost, safety
Performance is strong, highly practical, and user experience is good.The damp-proof type LED screen 10 includes shell 200 and moisture protection system 100.It is moisture-proof
Protection system 100 is installed in shell 200, and shell 200 protects moisture protection system 100, and moisture protection system 100 is used
In luminescence imaging.
Fig. 2 is please referred to, moisture protection system 100 includes humidity sensor 110, operation detection module 130, master controller
150 and LED light 170.Humidity sensor 110 and operation detection module 130 are connect with master controller 150, humidity sensor 110
For detecting ambient humidity and generating humidity data, and humidity data is sent to master controller 150, runs detection module 130
It is sent to master controller 150 for detection device power-off time and generated time data, and by time data, wherein equipment is
For entire damp-proof type LED screen 10.Master controller 150 is connect with LED light 170, master controller 150 for receive humidity data and when
Between data, and changed by the electric current of LED light 170 according to humidity data and time data control.
When time data is less than the first preset value, the electric current that the control of master controller 150 passes through LED light 170 is first pre-
If electric current.In the present embodiment, the first preset value is 8 hours, and the first predetermined current is 100% rated current of LED light 170, i.e.,
It when 10 power-off time of damp-proof type LED screen is interior when 8 is small, is directly opened with 100% rated current, extraneous moisture is also at this time
LED light 170 is not entered, the damage of LED light 170 can't be led to by fully opening LED light 170.
Fig. 3 is please referred to, when time data is between the first preset value and the second preset value, master controller 150 controls
Increase to the first predetermined current from the second predetermined current in the first preset time period by the electric current of LED light 170.The present embodiment
In, the second preset value is 24 hours, and the second predetermined current is zero, and the first preset time period is 6 minutes, i.e., when damp-proof type LED screen
When 10 power-off times are between 8 hours and 24 hours, in 6 minutes by by the electric current of LED light 170 from zero to 100%
Rated current is slowly increased, slowly to disperse the moisture in LED light 170.
It is worth noting that, the electric current being slowly increased in 6 minutes is not to linearly increase, but input at the beginning
10% rated current increased to 30% rated current at the 1st minute, and 60% rated current was increased at the 2nd minute,
80% rated current is increased at 4 minutes, 100% rated current was increased at the 5th minute, is stablized to electric current at the 6th minute,
Fully open LED light 170.
Fig. 4 is please referred to, when time data is between the second preset value and third preset value, and humidity data is higher than default
When humidity value, the control of master controller 150 is increased in the second preset time period from the second predetermined current by the electric current of LED light 170
It is added to the first predetermined current.In the present embodiment, third preset value is 7 days, and as 148 hours, it was 65%RH to preset humidity value, the
Two preset time periods are 60 minutes, i.e., between 10 power-off time of damp-proof type LED screen is when 24 is small and when 148 is small, and environment
When humidity is more than 65%RH, will slowly it be increased by from zero to 100% rated current of the electric current of LED light 170 in 60 minutes
Add, slowly to disperse the moisture in LED light 170.
It is worth noting that, the electric current being slowly increased in 60 minutes is not to linearly increase, but it is defeated at the beginning
Enter 10% rated current, 30% rated current increased at the 10th minute, 60% rated current was increased at the 20th minute,
80% rated current was increased at the 40th minute, 100% rated current was increased at the 50th minute, to electricity at the 60th minute
Stream is stablized, and LED light 170 is fully opened.
Fig. 5 is please referred to, when time data is between the second preset value and third preset value, and humidity data is less than default
When humidity value, the control of master controller 150 is increased in third preset time period from the second predetermined current by the electric current of LED light 170
It is added to the first predetermined current, the second preset time period is more than third preset time period.In the present embodiment, third preset time period is
30 minutes, the humidity of external environment generally on 10%RH, i.e., when 10 power-off time of damp-proof type LED screen when 24 is small with 148
Between hour, and when ambient humidity is between 10%RH and 65%RH, the electricity of LED light 170 will be passed through in 30 minutes
From zero to 100% rated current of stream is slowly increased, slowly to disperse the moisture in LED light 170.
It is worth noting that, the electric current being slowly increased in 30 minutes is not to linearly increase, but it is defeated at the beginning
Enter 10% rated current, 30% rated current increased at the 5th minute, 60% rated current was increased at the 10th minute,
80% rated current was increased at the 20th minute, 100% rated current was increased at the 25th minute, to electricity at the 30th minute
Stream is stablized, and LED light 170 is fully opened.
Fig. 6 is please referred to, when time data is higher than third preset value, and humidity data is higher than default humidity value, main control
The control of device 150 increases to the first default electricity in the 4th preset time period by the electric current of LED light 170 from the second predetermined current
Stream.In the present embodiment, the 4th preset time period is 6 hours, i.e., when 10 power-off time of damp-proof type LED screen was at 7 days or more, and ring
When border humidity is more than 65%RH, will slowly it be increased by from zero to 100% rated current of the electric current of LED light 170 in 6 hours
Add, slowly to disperse the moisture in LED light 170.
It is worth noting that, the electric current being slowly increased in 6 hours is not to linearly increase, but input at the beginning
10% rated current increased to 30% rated current at the 1st hour, and 60% rated current was increased at the 2nd hour,
80% rated current is increased at 4 hours, 100% rated current was increased at the 5th hour, is stablized to electric current at the 6th hour,
Fully open LED light 170.
It is main when time data is higher than third preset value, and humidity data is less than default humidity value please continue to refer to Fig. 4
The control of controller 150 increases to first from the second predetermined current in the 5th preset time period by the electric current of LED light 170 and presets
Electric current, the 4th preset time period are more than the 5th preset time period.In the present embodiment, the 5th preset time period is 60 minutes, extraneous
The humidity of environment is generally on 10%RH, i.e., when 10 power-off time of damp-proof type LED screen was at 7 days or more, and ambient humidity exists
When between 10%RH and 65%RH, it will be delayed by from zero to 100% rated current of the electric current of LED light 170 in 60 minutes
It is slow to increase, slowly to disperse the moisture in LED light 170.
It is worth noting that, the electric current being slowly increased in 60 minutes is not to linearly increase, but it is defeated at the beginning
Enter 10% rated current, 30% rated current increased at the 10th minute, 60% rated current was increased at the 20th minute,
80% rated current was increased at the 40th minute, 100% rated current was increased at the 50th minute, to electricity at the 60th minute
Stream is stablized, and LED light 170 is fully opened.
Fig. 7 is please referred to, master controller 150 includes processing module 151 and control module 153.Humidity sensor 110 and operation
Detection module 130 is connect with processing module 151, and processing module 151 is connect by control module 153 with LED light 170.Processing
Module 151 is used to send out control instruction to control module 153 according to humidity data and time data, and control module 153 is used for root
The electric current for passing through LED light 170 according to control instruction control.
In the present embodiment, control module 153 is constant-current driven chip, passes through the electric current of LED light 170 with stability contorting.
Processing module 151 includes reading unit 1511 and arithmetic element 1513.Reading unit 1511 passes through arithmetic element
1513 connect with control module 153, and reading unit 1511 sends it to operation for receiving humidity data and time data
Unit 1513.Arithmetic element 1513 is used to carry out judgement to humidity data and time data to handle to be judged as a result, and foundation
Judge that result generates control instruction, and control instruction is sent to control module 153.
In the present embodiment, operation detection module 130 is RTC charged pool circuits, and RTC charged pool circuits are used in damp-proof type
LED screen 10 starts timing while power-off, and stops timing when damp-proof type LED screen 10 is once again powered up, and generated time data,
Order of accuarcy is high.
The moisture protection system 100 that the utility model embodiment provides, humidity sensor 110 and operation detection module 130
It is connect with master controller 150, humidity sensor 110 is for detecting ambient humidity and generating humidity data, and by humidity data
It is sent to master controller 150, operation detection module 130 is used for detection device power-off time and generated time data, and by the time
Data are sent to master controller 150, and master controller 150 is connect with LED light 170, master controller 150 be used for according to humidity data and
The electric current that time data control passes through LED light 170.Compared with prior art, moisture protection system 100 provided by the utility model
As a result of the humidity sensor 110 and operation detection module 130 being connect respectively with master controller 150, so being capable of basis
The humidity of environment and the time of device powers down substantially judge the humidity in LED light 170, pass through LED light 170 to slowly improve
Electric current, protection LED light 170 is without damage, extends the service life of LED light 170, reduces maintenance cost, and security performance is strong, real
It is strong with property so that damp-proof type LED screen 10 is stablized durable, and service life is long, and user experience is good.
The preferred embodiment that these are only the utility model, is not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of moisture protection system, which is characterized in that including humidity sensor, operation detection module, master controller and LED
Lamp, the humidity sensor and the operation detection module are connect with the master controller, and the humidity sensor is for examining
It surveys ambient humidity and generates humidity data, and the humidity data is sent to the master controller, the operation detection module
It is sent to the master controller, the master for detection device power-off time and generated time data, and by the time data
Controller is connect with the LED light, and the master controller is used to be passed through according to the humidity data and time data control
The electric current of the LED light.
2. moisture protection system according to claim 1, which is characterized in that the master controller is used to work as the time number
When according to less than the first preset value, the electric current that control passes through the LED light is the first predetermined current.
3. moisture protection system according to claim 2, which is characterized in that the master controller is used to work as the time number
When according between first preset value and the second preset value, control is by the electric current of the LED light in the first preset time
Increase to first predetermined current from the second predetermined current in section.
4. moisture protection system according to claim 3, which is characterized in that the master controller is used to work as the time number
According between second preset value and third preset value, and when the humidity data is higher than default humidity value, control passes through
The electric current of the LED light increases to first predetermined current in the second preset time period from second predetermined current；Institute
It states master controller to be additionally operable to be between second preset value and third preset value when the time data, and the humidity number
When according to less than default humidity value, control is by the electric current of the LED light from the described second default electricity in third preset time period
Stream increases to first predetermined current, and second preset time period is more than the third preset time period.
5. moisture protection system according to claim 4, which is characterized in that the master controller is used to work as the time number
According to higher than the third preset value, and when the humidity data is higher than the default humidity value, control passes through the electricity of the LED light
Stream increases to first predetermined current in the 4th preset time period from second predetermined current；The master controller is also used
In when the time data is higher than the third preset value, and the humidity data is less than default humidity value, control passes through institute
State the electric current of LED light increases to first predetermined current in the 5th preset time period from second predetermined current, described
4th preset time period is more than the 5th preset time period.
6. moisture protection system according to claim 1, which is characterized in that the master controller includes processing module and control
Molding block, the humidity sensor and the operation detection module are connect with the processing module, and the processing module passes through
The control module is connect with the LED light, the processing module be used for according to the humidity data and the time data to
The control module sends out control instruction, and the control module is used to pass through the LED light according to control instruction control
Electric current.
7. moisture protection system according to claim 6, which is characterized in that the processing module includes reading unit and fortune
Unit is calculated, the reading unit is connect by the arithmetic element with the control module, and the reading unit is for receiving institute
Humidity data and the time data are stated, and sends it to the arithmetic element, the arithmetic element is used for the humidity
Data and the time data carry out judgement handle judged as a result, and according to the judgement result generate it is described control refer to
It enables, and the control instruction is sent to the control module.
8. moisture protection system according to claim 6, which is characterized in that the control module is constant-current driven chip.
9. moisture protection system according to claim 1, which is characterized in that the operation detection module is RTC charged pools
Circuit, the RTC charged pools circuit are used to start timing while the device powers down, and when the equipment is once again powered up
Stop timing, and generates the time data.
10. a kind of damp-proof type LED screen, which is characterized in that including shell and moisture protection system, the moisture protection system installation
In in the shell, the moisture protection system includes humidity sensor, runs detection module, master controller and LED light, described
Humidity sensor and the operation detection module are connect with the master controller, and the humidity sensor is for detecting environmental wet
Degree and generation humidity data, and the humidity data is sent to the master controller, the operation detection module is for detecting
Device powers down time and generated time data, and the time data is sent to the master controller, the master controller with
The LED light connection, the master controller are used to pass through the LED light according to the humidity data and time data control
Electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721788372.0U CN207854222U (en) | 2017-12-19 | 2017-12-19 | A kind of moisture protection system and damp-proof type LED screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721788372.0U CN207854222U (en) | 2017-12-19 | 2017-12-19 | A kind of moisture protection system and damp-proof type LED screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207854222U true CN207854222U (en) | 2018-09-11 |
Family
ID=63421430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721788372.0U Active CN207854222U (en) | 2017-12-19 | 2017-12-19 | A kind of moisture protection system and damp-proof type LED screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207854222U (en) |
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2017
- 2017-12-19 CN CN201721788372.0U patent/CN207854222U/en active Active
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