CN112133212A - Outdoor LED advertisement screen of thunder and lightning is prevented in dust removal - Google Patents
Outdoor LED advertisement screen of thunder and lightning is prevented in dust removal Download PDFInfo
- Publication number
- CN112133212A CN112133212A CN202011117585.7A CN202011117585A CN112133212A CN 112133212 A CN112133212 A CN 112133212A CN 202011117585 A CN202011117585 A CN 202011117585A CN 112133212 A CN112133212 A CN 112133212A
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- Prior art keywords
- cavity
- lightning
- sound receiving
- outer frame
- plate
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels
- H05K7/20972—Forced ventilation, e.g. on heat dissipaters coupled to components
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/027—Arrangements or methods related to powering off a display
Abstract
The invention discloses a dust-removing and lightning-proof outdoor LED advertising screen which comprises an outer frame and a display screen arranged in the outer frame, wherein a plurality of sound receiving grooves are formed in the outer walls of the two sides of the outer frame, a vibrating membrane is fixedly connected in each sound receiving groove, a piece of piezoelectric ceramic is fixedly connected to the inner wall of each sound receiving groove, and a vibrating block is bonded at the central position of one side, close to the piezoelectric ceramic, of each vibrating membrane. Has the advantages that: the device converts the noise as energy, is used for dedusting and radiating the surface of the display screen, improves the display effect of the advertising screen while saving energy, judges lightning by using the propagation speed difference of lightning and thunder in thunderstorm weather, and timely cuts off the power supply of the LED advertising screen by the control device, thereby preventing the subsequent lightning from damaging electronic elements in the LED advertising screen and having better lightning protection effect.
Description
Technical Field
The invention relates to the technical field of outdoor display equipment, in particular to a dust-removing and lightning-proof outdoor LED advertisement screen.
Background
The LED advertisement is a new media advertisement form, and is a perfect combination of a new media technology and an outdoor advertisement publishing form. The LED advertisement is an advertisement word or picture spliced by using light emitting diodes, such as electronic large screen advertisement which is usually seen on the street or highlighted advertisement words and signs with colored light on the roadside, and the LED advertisement is an optimal carrier for outdoor commercial advertisement release by using a large-area display screen formed by dot matrix modules or pixel units formed by the light emitting diodes and combining a plurality of modern high and new technologies such as micro-electronics, optics, information processing and the like.
Present LED advertising screen is mostly set up at building outward appearance or street, outdoor public places such as square, the screen surface falls the ash easily, and the display screen is located the eminence and is not convenient for clear up, long-time dust accumulation not only influences the advertisement display effect, can reduce the radiating efficiency of display screen moreover, when in thunderstorm weather, there are more electronic equipment in the LED advertising screen, if not in time close the power, the thunder and lightning very easily leads to the fact the damage to inside electronic component, for this, we provide a dust removal lightning protection's outdoor LED advertising screen.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, dust is easy to fall from the surface of an LED advertising screen, the display screen is positioned at a high position and is inconvenient to clean, long-time dust accumulation not only affects the advertising display effect, but also can reduce the heat dissipation efficiency of the display screen, and when the power supply is not turned off in time in thunderstorm weather, thunder and lightning easily damage internal electronic elements.
In order to achieve the purpose, the invention adopts the following technical scheme: a dust-removing and lightning-proof outdoor LED advertising screen comprises an outer frame and a display screen arranged in the outer frame, wherein a plurality of sound receiving grooves are formed in the outer walls of the two sides of the outer frame, a vibrating membrane is fixedly connected in each sound receiving groove, a piece of piezoelectric ceramic is fixedly connected to the inner wall of each sound receiving groove, and a vibrating block is bonded at the center of one side, close to the piezoelectric ceramic, of each vibrating membrane;
a cavity is formed above each sound receiving groove, a gas outlet hole is formed in the cavity wall of one side, close to the display screen, of each cavity, a gas inlet is formed in one side, far away from the gas outlet hole, of each cavity, a partition plate is fixedly connected to the inner cavity wall of each cavity, a first electromagnet is embedded in one side, far away from the gas outlet hole, of each partition plate, the first electromagnet is electrically connected with piezoelectric ceramics in the sound receiving groove right below, and a magnetic plate is connected to the space, close to the gas inlet, of one side, close to the gas inlet, of each partition plate in a sealing and sliding mode;
a recess has been seted up at the top of frame, the frame is located one side of recess and inlays and establishes a photosensitive controller, the notch department of recess is provided with the electronic board by photosensitive controller control, recess internal seal sliding connection has a horizontally glass board, the lower terminal surface of glass board is connected with two springs, two the lower extreme of spring and the bottom fixed connection of recess, a stock solution box of bottom fixedly connected with of recess, the stock solution box intussuseption is filled with hypochlorous acid liquid, a through-hole has been seted up on the glass board.
In foretell outdoor LED advertising screen of dust removal lightning protection, respectively inlay on the both sides cell wall of recess and be equipped with a conducting block, the conducting block is located the top position of glass board, a control chamber has been seted up to the bottom of frame, the top chamber wall fixedly connected with second electro-magnet in control chamber, the second electro-magnet passes through the wire and establishes ties with one of them piezoceramics and two conducting blocks, sliding connection has a magnetic electroplax that connects in the control chamber, respectively be provided with an elasticity on the both sides chamber wall in control chamber and connect the electricity piece, elasticity connects the electricity piece to establish ties with the display screen, connect the insulating release link of bottom fixedly connected with of electroplax, the lower extreme of release link runs through the bottom chamber wall in control chamber and extends to the outside of frame.
In the outdoor LED advertising screen with functions of dust removal and lightning protection, a conductive strip made of indium tin oxide material is laid on the glass plate.
In the outdoor LED advertising screen with the functions of dust removal and lightning protection, the pressure valve is arranged at the air outlet, and the one-way valve is respectively arranged on the partition board and the magnetic plate.
Compared with the prior art, the invention has the advantages that:
1. the vibration block is driven to swing back and forth by receiving the vibration generated by the noise of the vibration film in the sound receiving groove, when the noise is too large, the vibration block can collide with the piezoelectric ceramic to generate current to electrify the first electromagnet, and when the noise is reduced, the vibration block cannot swing enough, and the piezoelectric ceramic cannot generate current to electrify the first electromagnet, so that the reciprocating sliding of the magnetic plate is controlled;
2. after multiple noise changes, the reciprocating sliding of the magnetic plate is utilized to pump air to the space on one side of the cavity, which is positioned at the air outlet, and the air pressure is opened when exceeding the threshold value of the pressure valve, so that the internal high-pressure air is sprayed to the surface of the display screen in a high-speed airflow mode, the dust on the surface of the display screen can be effectively removed, and meanwhile, the LED advertising screen is subjected to auxiliary heat dissipation;
3. when the LED advertising screen is in thunderstorm weather, the lightning is judged by using the propagation speed difference of lightning and thunder, and the power supply of the LED advertising screen is cut off in time by the control device, so that the electronic elements in the LED advertising screen are prevented from being damaged by subsequent lightning, and a better lightning protection effect is achieved.
Drawings
FIG. 1 is a schematic structural diagram of an outdoor LED advertising screen with dust removal and lightning protection functions, which is provided by the invention;
FIG. 2 is an enlarged schematic view of the outdoor LED advertisement screen with dust removal and lightning protection at the position A;
FIG. 3 is an enlarged schematic view of the outdoor LED advertisement screen B for dust removal and lightning protection;
fig. 4 is an enlarged schematic view of the outdoor LED advertisement screen with dust removal and lightning protection functions at position C.
In the figure: the device comprises a display screen 1, an outer frame 2, a sound receiving groove 3, a vibrating membrane 4, piezoelectric ceramics 5, a vibrating block 6, a cavity 7, an air outlet hole 8, an air inlet 9, a partition plate 10, a magnetic plate 11, a first electromagnet 12, a groove 13, an electric plate 14, a photosensitive controller 15, a glass plate 16, a spring 17, a liquid storage box 18, a conductive block 19, a through hole 20, a control cavity 21, a second electromagnet 22, a power connection plate 23, an elastic power connection block 24 and a reset rod 25.
Detailed Description
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are only for illustrative purposes and are not intended to limit the scope of the present invention.
Examples
Referring to fig. 1-4, a dust-removing and lightning-proof outdoor LED advertising screen comprises an outer frame 2 and a display screen 1 arranged in the outer frame 2, wherein a plurality of sound receiving grooves 3 are formed in outer walls of two sides of the outer frame 2, a vibration film 4 is fixedly connected in each sound receiving groove 3, the vibration film 4 can generate vibration with a fixed amplitude according to the volume, a piece of piezoelectric ceramic 5 is fixedly connected to the inner wall of each sound receiving groove 3, the piezoelectric ceramic 5 is an information functional ceramic material capable of converting mechanical energy into electric energy, and a vibration block 6 is bonded at the center of one side, close to the piezoelectric ceramic 5, of the vibration film 4;
a cavity 7 is arranged above each radio slot 3, a cavity wall of one side of each cavity 7 close to the display screen 1 is provided with an air outlet 8 which is just opposite to the outer surface of the display screen 1, one side of each cavity 7 far away from the air outlet 8 is provided with an air inlet 9 which is communicated with the outside, the inner cavity wall of each cavity 7 is fixedly connected with a partition plate 10, one side of the partition plate 10 far away from the air outlet 8 is embedded with a first electromagnet 12, the first electromagnet 12 is electrically connected with the piezoelectric ceramic 5 in the radio slot 3 right below, one side of the partition plate 10 close to the air inlet 9 of each cavity 7 is hermetically and slidably connected with a magnetic plate 11, the first electromagnet 12 is magnetically repelled with the magnetic plate 11 after being electrified, a pressure valve is arranged at the air outlet 8, one-way valves are respectively arranged on the partition plate 10 and the magnetic plate 11, the one-way valve at the partition plate 10 allows air to flow from one side of the partition plate 10 close to the air inlet, the one-way valve at the magnetic plate 11 allows air to flow only from one side of the tank partition 10 at one side of the air inlet 9.
The top of the outer frame 2 is provided with a groove 13, one side of the outer frame 2, which is positioned at the groove 13, is embedded with a photosensitive controller 15 and is in a circuit with the display screen 1, the notch of the groove 13 is provided with an electric plate 14 controlled by the photosensitive controller 15, the electric plate 14 is controlled to be opened when light is dark, and the electric plate 14 has a control delay effect, the groove 13 is internally connected with a horizontal glass plate 16 in a sealing and sliding manner, the glass plate 16 is paved with a conductive strip made of indium tin oxide material, the conductive strip made of indium tin oxide material has the characteristics of transparency and conductivity (not shown in the figure), the light transmittance of the glass plate 16 is not affected, the lower end surface of the glass plate 16 is connected with two springs 17, the lower ends of the two springs 17 are fixedly connected with the bottom of the groove 13, the bottom of the groove 13 is fixedly connected with a liquid storage box 18, and the, make and to decompose fast receiving the bright light to shine, a through-hole 20 has been seted up on the glass board 16, respectively inlay on the both sides cell wall of recess 13 and be equipped with a conducting block 19, conducting block 19 is located the top position of glass board 16, a control chamber 21 has been seted up to the bottom of frame 2, the top chamber wall fixedly connected with second electro-magnet 22 of control chamber 21, second electro-magnet 22 establishes ties through the wire with one of them piezoceramics 5 and two conducting blocks 19, sliding connection has a magnetic electricity receiving plate 23 in the control chamber 21, respectively be provided with an elasticity electricity receiving block 24 on the both sides chamber wall of control chamber 21, elasticity electricity receiving block 24 establishes ties with display screen 1, connect insulating release link 25 of bottom fixedly connected with of electricity receiving plate 23, the lower extreme of release link 25 runs through the bottom chamber wall of control chamber 21 and extends to the outside of frame 2.
In the invention, because the LED advertising screen is mostly arranged in outdoor public places such as streets and squares with noisy people flow, more noise is generated, the noise can cause the vibration film 4 in the sound receiving groove 3 to vibrate and drive the vibration block 6 to swing back and forth, when the noise is large, the amplitude of the vibration film 4 is increased, so that the swinging distance of the vibration block 6 is increased, the piezoelectric ceramic 5 on the inner wall of the sound receiving groove 3 is impacted, the piezoelectric ceramic 5 generates current to energize the first electromagnet 12, the repulsion force of the first electromagnet 12 to the magnetic plate 1 after energization pushes the magnetic plate 11 to slide towards the air inlet 9, under the action of the one-way valve, negative pressure is generated between the magnetic plate 11 and the partition plate 10 to suck external air, when the noise is reduced, and the piezoelectric ceramic 5 does not generate current, the first electromagnet 12 becomes ferromagnetic to enable the magnetic plate 11 to slide towards the partition plate 10, therefore, the air is compressed into the other side of the partition plate 10, the magnetic plate 11 performs reciprocating circular sliding after experiencing a plurality of times of large noise, namely, the air is pumped to one side of the cavity 7, which is positioned at the air outlet 8, when the air pressure exceeds the value of the pressure valve at the air outlet 8, the pressure valve is opened, the internal air is sprayed to the surface of the display screen 1 in a high-speed airflow mode, on one hand, dust on the surface of the display screen is removed, and on the other hand, auxiliary heat dissipation is performed on the LED advertising screen.
When thunderstorm weather occurs, the sky is gathered in dark clouds, the light rays are darker and reach the sensing range of the photosensitive controller 15, the electric board 14 is in an open state, when first lightning occurs, instant light is emitted into the groove 13, the instant light photosensitive controller 15 cannot respond, the bright light is emitted into the liquid storage box 18 through the glass board, hypochlorous liquid in the liquid storage box is decomposed and reacts to generate a large amount of oxygen, the generation speed of the oxygen is higher than the exhaust speed of the through hole 10, the pressure intensity of the space below the glass board 16 is increased, the glass board 16 is pushed to slide upwards to enable the conductive strips to be in contact connection with the two conductive blocks 19, meanwhile, the exhaust of the through hole 20 has a delay effect on the downward sliding of the glass board 16, generally, the lightning is later than a few seconds, when the lightning arrives, the two conductive blocks 19 are in a conducting state, and the vibration of the vibration film 3 caused by the lightning enables the piezoelectric ceramics 5 to generate current and pass through the second electromagnet 22, the magnetic connection electric plate 23 has a downward repulsive force to the electric plate, the electric plate 23 is pushed to slide downwards through the elastic connection electric blocks 24, the connection with the two elastic connection electric blocks 24 is disconnected, namely, the power supply of the display screen 1 is cut off, the electronic elements at the bottom in the LED advertising screen are prevented from being damaged by subsequent lightning, and after the weather of the lightning passes, the reset rod 25 can be pushed upwards, so that the electric plate 23 is connected with the two elastic connection electric blocks 24 again, and the display screen 1 works normally.
Although the terms of the display screen 1, the outer frame 2, the sound receiving groove 3, the vibrating membrane 4, the piezoelectric ceramic 5, the vibrating mass 6, the cavity 7, the air outlet hole 8, the air inlet 9, the partition plate 10, the magnetic plate 11, the first electromagnet 12, the groove 13, the electric plate 14, the photosensitive controller 15, the glass plate 16, the spring 17, the liquid storage box 18, the conductive block 19, the through hole 20, the control cavity 21, the second electromagnet 22, the electric plate 23, the elastic electric block 24, the reset rod 25, etc. are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (4)
1. The outdoor LED advertising screen comprises an outer frame (2) and a display screen (1) arranged in the outer frame (2), and is characterized in that a plurality of sound receiving grooves (3) are formed in outer walls of two sides of the outer frame (2), a vibrating membrane (4) is fixedly connected to the inside of each sound receiving groove (3) in each sound receiving groove (3), a piece of piezoelectric ceramic (5) is fixedly connected to the inner wall of each sound receiving groove (3), and a vibrating block (6) is bonded to the center of one side, close to the piezoelectric ceramic (5), of each vibrating membrane (4);
a cavity (7) is formed in the upper position of each sound receiving groove (3), a gas outlet hole (8) is formed in the cavity wall of one side, close to the display screen (1), of each cavity (7), a gas inlet (9) is formed in one side, far away from the gas outlet hole (8), of each cavity (7) and communicated with the outside, a partition plate (10) is fixedly connected to the inner cavity wall of each cavity (7), a first electromagnet (12) is embedded in one side, far away from the gas outlet hole (8), of each partition plate (10), the first electromagnet (12) is electrically connected with the piezoelectric ceramic (5) in the sound receiving groove (3) right below, and a magnetic plate (11) is connected to the space, close to the gas inlet (9), of one side, located on the partition plate (10), of each cavity (7) in a sealing and sliding mode;
a recess (13) has been seted up at the top of frame (2), frame (2) are located one side of recess (13) and inlay and establish a photosensitive controller (15), the notch department of recess (13) is provided with electronic board (14) by photosensitive controller (15) control, recess (13) inner seal sliding connection has a horizontally glass board (16), the lower terminal surface of glass board (16) is connected with two springs (17), two the lower extreme of spring (17) and the bottom fixed connection of recess (13), bottom fixed connection of recess (13) has a stock solution box (18), stock solution box (18) intussuseption is filled with hypochlorous acid liquid, a through-hole (20) has been seted up on glass board (16).
2. The outdoor LED advertising screen of claim 1, wherein a conductive block (19) is embedded on each of the two side walls of the groove (13), the conductive block (19) is located above the glass plate (16), a control cavity (21) is formed in the bottom of the outer frame (2), a second electromagnet (22) is fixedly connected to the top cavity wall of the control cavity (21), the second electromagnet (22) is connected in series with one of the piezoelectric ceramics (5) and the two conductive blocks (19) through a wire, a magnetic power connection plate (23) is slidably connected in the control cavity (21), an elastic power connection block (24) is arranged on each of the two side cavity walls of the control cavity (21), the elastic power connection block (24) is connected in series with the display screen (1), and an insulating reset rod (25) is fixedly connected to the bottom of the power connection plate (23), the lower end of the reset rod (25) penetrates through the bottom cavity wall of the control cavity (21) and extends to the outer side of the outer frame (2).
3. The outdoor LED advertising screen of claim 1, wherein the glass plate (16) is coated with a conductive strip made of indium tin oxide.
4. The outdoor LED advertising screen with dust and lightning removal and protection functions as claimed in claim 1, wherein a pressure valve is arranged at the air outlet (8), and a one-way valve is respectively arranged on the partition plate (10) and the magnetic plate (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011117585.7A CN112133212B (en) | 2020-10-19 | 2020-10-19 | Outdoor LED advertisement screen of thunder and lightning is prevented in dust removal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011117585.7A CN112133212B (en) | 2020-10-19 | 2020-10-19 | Outdoor LED advertisement screen of thunder and lightning is prevented in dust removal |
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| Publication Number | Publication Date |
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| CN112133212A true CN112133212A (en) | 2020-12-25 |
| CN112133212B CN112133212B (en) | 2021-05-14 |
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| CN202011117585.7A Active CN112133212B (en) | 2020-10-19 | 2020-10-19 | Outdoor LED advertisement screen of thunder and lightning is prevented in dust removal |
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| CN (1) | CN112133212B (en) |
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| CN113053259A (en) * | 2021-04-02 | 2021-06-29 | 四川凝彩电子器件制造有限公司 | Information service LED large display screen integrated device |
| CN113433046A (en) * | 2021-06-23 | 2021-09-24 | 江苏铁军软件科技有限公司 | Raise dust detecting system for job site |
| CN113759211A (en) * | 2021-08-12 | 2021-12-07 | 任福海 | Intelligent cable fault tester |
| CN115430667A (en) * | 2022-06-24 | 2022-12-06 | 南通海益尔智能家居有限责任公司 | Intelligence house equipment detects display device |
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| CN115430667A (en) * | 2022-06-24 | 2022-12-06 | 南通海益尔智能家居有限责任公司 | Intelligence house equipment detects display device |
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