LED display system

Abstract

The invention discloses an LED display system, and the system comprises an opening and closing detection circuit which is disposed in a box body of an LED cinema screen, the box body achieves the opening and closing through a mechanical switch, and the opening and closing detection circuit is used for detecting the on-off state of the mechanical switch so as to detect the opening and closing state of the box body; the isolation circuit is connected with the opening and closing detection circuit and the server and is used for realizing electrical isolation between the LED cinema screen and the server; and the sending card is connected with the isolation circuit and used for transmitting the detection voltage to the isolation circuit, and the server starts or stops running based on the detection voltage and the opening and closing state of the box body. The opening and closing state of the box body can be detected by switching on and off the mechanical switch through the opening and closing detection circuit, the circuit structure is simple, meanwhile, electrical isolation between the server and the LED cinema screen is achieved through the isolation circuit, and safe use of the server is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly to an LED display system. Background Art

[0002] With the rapid development of the times, breakthroughs and innovations are emerging in the field of display technologies every year. Among them, watching movies has become one of the main ways for modern people to relax and entertain, and the basic equipment for watching movies is a movie screen that can display movies. Nowadays, due to its convenient assembly and self-luminous display characteristics, the LED cinema screen not only overcomes the disadvantage of the traditional LCD screen that it is impossible to produce large-size screens, but also far leads the traditional movie equipment in terms of picture characteristics such as brightness, color expressiveness, refresh rate, and gray-scale display. It is a major trend in the development of future cinemas.

[0003] However, for the LED cinema screen, no matter how the film data is encrypted, the film data will ultimately be decrypted into pixel data and displayed through the LED light board. Since the cinema screen needs to be placed in the cinema and comes into contact with the audience, and the LED products inherently support being detachable, which is incompatible with the data security of the film. This has become a major problem in cinema management. If the box of the cinema screen is opened by others during the screening of a film, and image data is intercepted and saved while the film is being played, then the hit film is very likely to be leaked to the external environment, which will cause immeasurable losses to the film producers and the cinema. Therefore, for the LED cinema screen, as long as the outer shell of the LED screen body is opened while the server is running normally, the server should automatically stop playing the film to protect the data security of the played film.

[0004] The current detection circuits for the opening and closing states of the outer shell of the LED screen body usually use various sensors, which have the disadvantages of high technical costs and complex circuits. Summary of the Invention

[0005] The present application provides an LED display system, which can solve the problems of high costs and complex circuits of the existing detection circuits.

[0006] The present application provides an LED display system, which includes:

[0007] An opening and closing detection circuit, which is arranged in the box of the LED cinema screen. The box is opened and closed through a mechanical switch, and the opening and closing detection circuit is used to detect the opening and closing of the mechanical switch to detect the opening and closing state of the box;

[0008] An isolation circuit, which is connected to the opening and closing detection circuit and the server, and is used to achieve electrical isolation between the LED cinema screen and the server;

[0009] The sending card is connected to the isolation circuit and is used to transmit the detection voltage to the isolation circuit. The server starts or stops running based on the detection voltage and the opening / closing state of the box body.

[0010] Further, the opening / closing detection circuit includes:

[0011] Three switch plates, and the three switch plates form a mechanical switch;

[0012] The detection board is serially arranged with the three switch plates, and the detection board and the three switch plates form a connected loop;

[0013] The receiving card is connected to the detection board through an interface;

[0014] Among them, when all three switch plates are in the pressed state, both sides of the switch plate are conducting, and the receiving card is conducting with the three switch plates through the detection board.

[0015] Further, the three switch plates include:

[0016] The first switch plate is arranged on the first side of the box body;

[0017] The second switch plate is arranged on the second side of the box body, where the first side and the second side are opposite sides of the box body along the length direction or the width direction;

[0018] The third switch plate is arranged on the third side of the box body, and the third side of the box body is adjacent to the first side and the second side of the box body respectively.

[0019] Further, each switch plate includes two touch switches, and the two touch switches are arranged in parallel.

[0020] Further, the receiving card includes:

[0021] The first receiving card is provided with a first interface, and the first interface is short-circuited through a wire;

[0022] The second receiving card is provided with a second interface, and the second receiving card is connected to the detection board through the second interface;

[0023] Among them, the first receiving card and the second receiving card are arranged in parallel.

[0024] Further, the LED display system includes a plurality of box bodies, and the plurality of box bodies are arranged in a matrix. The matrix is an N*M matrix, and each box body is provided with an opening / closing detection circuit. The plurality of opening / closing detection circuits are serially arranged; where N and M are integers greater than 0.

[0025] Further, the first receiving cards in the box bodies of the adjacent two rows of the box bodies in the m-th column are serially arranged; where m is an integer greater than 0 and less than or equal to M;

[0026] The second receiving cards in the boxes of two adjacent rows of the boxes in the m-th column are connected in series;

[0027] The first receiving card and the second receiving card in each box of the boxes in the first row are connected in series;

[0028] The first receiving card and the second receiving card in each box of the boxes in the n-th row are connected in parallel; where n is an integer greater than 1 and less than or equal to N.

[0029] Furthermore, the opening and closing detection circuit further includes a signal connection board, and the signal connection board is respectively connected to the first receiving card and the second receiving card in the boxes in the N-th row.

[0030] Furthermore, the number of signal connection boards is M, and the signal connection board includes:

[0031] A first signal terminal, which is connected to the first receiving card in the box at the m-th column of the N-th row through a first wire;

[0032] A second signal terminal, which is connected to the second receiving card in the box at the m-th column of the N-th row through a first wire;

[0033] A third signal terminal, which is connected to the first signal terminal through a second wire;

[0034] A fourth signal terminal, which is connected to the second signal terminal through a second wire; the third signal terminal and the fourth signal terminal are respectively connected to the signal connection boards on both sides of the signal connection board through a third wire;

[0035] Wherein, the third signal terminal or the fourth signal terminal of the signal connection board at the end side is short-circuited, so that the signal connection board connects all the first receiving cards and all the second receiving cards in series.

[0036] Furthermore, the isolation circuit includes an optocoupler, a first resistor, a second resistor and a capacitor;

[0037] Wherein, one end of the first resistor is connected to the sending card to receive the detection voltage, the other end of the first resistor is connected to one end of the capacitor and one end of the opening and closing detection circuit, the other end of the opening and closing detection circuit is connected to the first end of the optocoupler, the second end of the optocoupler is grounded, and the other end of the capacitor is further grounded;

[0038] One end of the second resistor receives the pull-up voltage, the other end of the second resistor is connected to the first end of the server and the third end of the optocoupler, the fourth end of the optocoupler is further grounded, and the second end of the server is further grounded.

[0039] Different from the prior art, the cabinet of the LED cinema screen in this application is opened and closed through a mechanical switch. The opening and closing detection circuit detects the on / off state of the mechanical switch, and then realizes the detection of the opening and closing state of the cabinet. Since a mechanical switch is used, its detection method is different from the circuit that requires the use of multiple sensors. The circuit structure of the opening and closing detection circuit in this application is simple and the cost is low. At the same time, this application further sets up an isolation circuit to connect the server and the opening and closing detection circuit, and uses the isolation circuit to achieve electrical isolation between the server and the LED cinema screen, ensuring the safe use of the server and further improving the security of the LED display system in this application.

[0040] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 is a schematic structural diagram of an embodiment of the LED display system in this application;

[0043] Figure 2 is a schematic structural diagram of a first embodiment of the opening and closing detection circuit in this application;

[0044] Figure 3 is a schematic structural diagram of a second embodiment of the opening and closing detection circuit in this application;

[0045] Figure 4 is a schematic structural diagram of an embodiment of the isolation circuit in this application;

[0046] Figure 5 is a schematic structural diagram of another embodiment of the LED display system in this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] To enable those skilled in the art to better understand the technical solutions of this application, the following will further describe in detail the LED display system provided in this application in conjunction with the drawings and specific embodiments. It can be understood that the described embodiments are only some embodiments of this application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0048] The terms "first," "second," and the like in this application are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0049] In response to the high cost and complex circuit problems of the existing LED screen box opening and closing detection circuit, this application provides an LED display system that not only ensures effective and safe detection of the opening and closing of the LED screen box, but also effectively reduces costs and simplifies the circuit. Figure 1 , Figure 1 It is a structural diagram of an embodiment of the LED display system of the present application.

[0050] like Figure 1 As shown, the LED display system 1 of this embodiment includes an opening and closing detection circuit 10, an isolation circuit 20, a sending card 30, an LED cinema screen (not shown), and a server 50. The LED cinema screen includes a housing 60 and a light panel disposed within the housing 60. The number of housings 60 can be selected based on actual needs. Optionally, in one embodiment, the isolation circuit 20, the sending card 30, and the server 50 can be integrated into a housing separate from the housing 60. This housing can be tightly mounted on the outside of the housing 60, facing away from the light panel to avoid affecting the display effect of the LED cinema screen. Specifically, this housing can be located at the back of the housing 60, located in the center and lower part of all the housings 60.

[0051] Specifically, the opening and closing detection circuit 10 of this embodiment is disposed within the housing 60 of the LED cinema screen. The housing 60 is opened and closed by a mechanical switch. The opening and closing detection circuit 10 is used to detect the switching of the mechanical switch to detect the opening and closing state of the housing 60. When the mechanical switch is detected to be in the closed state, the housing 60 of the LED cinema screen is determined to be in the closed state; when the mechanical switch is detected to be in the open state, the housing 60 of the LED cinema screen is determined to be in the open state.

[0052] The isolation circuit 20 connects the opening and closing detection circuit 10 and the server 50 to achieve electrical isolation between the LED cinema screen and the server 50. Since the opening and closing detection circuit 10 is disposed within the housing 60 of the LED cinema screen and is connected to a mechanical switch that detects the opening and closing state of the housing 60, that is, the opening and closing detection circuit 10 is electrically connected to the LED cinema screen, the isolation circuit 20 is disposed between the opening and closing detection circuit 10 and the server 50, and is electrically connected to each of the two circuits. This allows for conversion from "electrical signal to optical signal to electrical signal" when transmitting control signals, thereby achieving electrical isolation between the LED cinema screen and the server 50.

[0053] The sending card 30 is connected to the isolation circuit 20 and is used to transmit a detection voltage to the isolation circuit 20. The server 50 starts or stops operating based on the detection voltage and the open / close state of the cabinet 60. Specifically, when the opening / closing detection circuit 10 detects that the cabinet 60 of the LED cinema screen is in the closed state, the isolation circuit 20 receives a first signal and the detection voltage, and the server 50 operates normally based on the detection voltage and the first signal. When the opening / closing detection circuit 10 detects that the cabinet 60 of the LED cinema screen is in the open state, the isolation circuit 20 receives a second signal and the detection voltage, and the server 50 stops operating based on the detection voltage and the second signal.

[0054] Combine Figure 1 , see further Figure 2 and Figure 3 , Figure 2 This is a first structural diagram of an embodiment of the opening and closing detection circuit of the present application. Figure 3 This is a second structural diagram of an embodiment of the opening and closing detection circuit of the present application. Figure 2 and Figure 3 As shown, the opening and closing detection circuit 10 includes three switch boards 11 , a receiving card 13 and a detection board 12 .

[0055] The three switch plates 11 form a mechanical switch. By controlling the opening and closing states of the three switch plates 11, the opening and closing states of the box 60 can be controlled. Optionally, the switch plates 11 in this embodiment can be tactile switches, and pressing the tactile switches controls the opening and closing of the box 60. Specifically, when the tactile switches are pressed, the two sides of the switch plates 11 are conductive; when the tactile switches are not pressed, the two sides of the switch plates 11 are not conductive.

[0056] The detection board 12 is connected in series with the three switch boards 11, forming a communication loop. The receiving card 13 is connected to the detection board 12 via an interface. Because the detection board 12 and the three switch boards 11 form a communication loop, when all three switch boards 11 are pressed, the two sides of the switch boards 11 are conductive, and the receiving card 13 is conductively connected to the three switch boards 11 through the detection board 12.

[0057] Specifically, the three switch boards 11 of this embodiment include a first switch board 111, a second switch board 112, and a third switch board 113, and the first switch board 111, the second switch board 112, and the third switch board 113 are arranged at different positions of the box body 60, which can further detect the opening and closing state of the box body 60, and avoid the situation that any switch board 11 fails to pop open due to special operations, and the box body 60 of the LED cinema screen is opened but not accurately detected.

[0058] Optionally, each switch board 11 of this embodiment includes two touch switches, and the two touch switches are arranged in parallel, which can prevent the two sides of the touch switch from not being conducted when one of the touch switches is damaged.

[0059] Among them, as Figure 3 shown, the first switch board 111 is arranged on the first side of the box body 60, the second switch board 112 is arranged on the second side of the box body 60, and the third switch board 113 is arranged on the third side of the box body 60. Among them, the first side and the second side are opposite sides of the box body 60 along the length direction or the width direction, and the third side of the box body 60 is adjacent to the first side and the second side of the box body 60 respectively.

[0060] In this embodiment, by arranging the first switch board 111, the second switch board 112, and the third switch board 113 on three sides of the box body 60, all positions of the box body 60 are basically covered. No matter which direction the box body 60 is pressed, at least one of the first switch board 111, the second switch board 112, and the third switch board 113 can open and close the box body 60 based on the pressing operation. That is, by detecting the opening and closing states of the first switch board 111, the second switch board 112, and the third switch board 113, the opening and closing state of the box body 60 of the LED cinema screen can be accurately detected, the reliability of detection can be improved, and the use safety of the LED cinema screen can be improved.

[0061] As Figure 2 and Figure 3 shown, the receiving card 13 of this embodiment includes a first receiving card 131 and a second receiving card 132, and the first receiving card 131 and the second receiving card 132 are arranged in parallel.

[0062] Specifically, the first receiving card 131 is provided with a first interface 1311, and the first interface 1311 is short-circuited by a wire; the second receiving card 132 is provided with a second interface 1321, and the second receiving card 132 is connected to the detection board 12 through the second interface.

[0063] Among them, in this embodiment, the first receiving card 131 is located on the left side of the box body 60 of the LED cinema screen, and the second receiving card 132 is located on the right side of the box body 60 of the LED cinema screen. Optionally, in other embodiments, the first receiving card 131 may be located on the right side of the box body 60 of the LED cinema screen, and the second receiving card 132 may be located on the left side of the box body 60 of the LED cinema screen.

[0064] Optionally, as Figure 2 shown, the first receiving card 131 is provided with a first end a and a second end b, the second receiving card 132 is provided with a third end c and a fourth end d, the first end a of the first receiving card 131 is connected to the next receiving card 13 for leading out data, and can be connected to the next first receiving card 131 or the second receiving card 132, for example, connected to Figure 2 the third end c of the second receiving card 132 shown; the second end b of the first receiving card 131 is connected to the previous first receiving card 131 to receive the data led out by it; the fourth end d of the second receiving card 132 is connected to the next second receiving card 132 for leading out data.

[0065] Combined with Figures 1 - 3 and further referring to Figure 5 , Figure 5 is a schematic structural diagram of another embodiment of the LED display system of the present application. As Figure 5 shown, the LED display system 1 of this embodiment can be composed of multiple LED cinema screens, and each LED cinema screen is correspondingly provided with a box body 60, that is, the LED display system 1 of this embodiment includes several box bodies 60, and the several box bodies 60 are arranged in a matrix, and the matrix is an N*M matrix, where N and M are integers greater than 0.

[0066] Among them, each box body 60 is provided with an opening and closing detection circuit 10, and several opening and closing detection circuits 10 are connected in series, so that several box bodies 60 are connected in series. That is, when it is detected that any one of the several box bodies 60 is in an open state, the control server 50 can be stopped to realize the overall detection of the several box bodies 60, and the reliability and accuracy of the detection are improved.

[0067] Furthermore, the first receiving cards 131 in the box bodies 60 in the adjacent two rows of the box bodies 60 in the mth column are connected in series through FFC lines (Flexible Flat Cable); where m is an integer greater than 0 and less than or equal to M; the second receiving cards 132 in the box bodies 60 in the adjacent two rows of the box bodies 60 in the mth column are connected in series through FFC lines; the first receiving cards 131 and the second receiving cards 132 in each box body 60 in the first row of box bodies 60 are connected in series through FFC lines.

[0068] That is to say, the first receiving cards 131 in each cabinet 60 located in the nth row of cabinets 60 are serially arranged with the first receiving cards 131 in the cabinets 60 of the previous row and / or the first receiving cards 131 in the cabinets 60 of the next row through FFC cables. The second receiving cards 132 in each cabinet 60 located in the nth row of cabinets 60 are serially arranged with the second receiving cards 132 in the cabinets 60 of the previous row and / or the second receiving cards 132 in the cabinets 60 of the next row through FFC cables. Moreover, the first receiving cards 131 and the second receiving cards 132 in the first row of cabinets 60 in each column are serially arranged through FFC cables, so as to realize the parallel arrangement of the first receiving cards 131 and the second receiving cards 132 in each cabinet 60 located in the nth row of cabinets 60, where n is an integer greater than 1 and less than or equal to N.

[0069] As Figure 5 shown, the opening and closing detection circuit 10 further includes a signal connection board 40, and the signal connection board 40 is respectively connected to the first receiving card 131 and the second receiving card 132 in the cabinets 60 located in the Nth row. Optionally, the number of signal connection boards 40 in this embodiment is M, that is, the number of signal connection boards 40 is equal to the number of columns of the matrix, and one signal connection board 40 is provided at the lowest side of each column of cabinets 60.

[0070] Specifically, the signal connection board 40 includes a first signal terminal 41, a second signal terminal 42, a third signal terminal 43, and a fourth signal terminal 44. Among them, the first signal terminal 41 is connected to the first receiving card 131 in the cabinet 60 located in the mth column of the Nth row through a first wire 411; the second signal terminal 42 is connected to the second receiving card 132 in the cabinet 60 located in the mth column of the Nth row through a first wire 411; the third signal terminal 43 is connected to the first signal terminal 41 through a second wire 412; the fourth signal terminal 44 is connected to the second signal terminal 42 through a second wire 412; the third signal terminal 43 and the fourth signal terminal 44 are respectively connected to the signal connection boards 40 on both sides of the signal connection board 40 through a third wire 413; among them, the third signal terminal 43 or the fourth signal terminal 44 of the signal connection board 40 located at the end side is short-circuited, so that the signal connection board 40 serially connects all the first receiving cards 131 and all the second receiving cards 132.

[0071] Among them, when several cabinets 60 are all in the closed state, the loop formed by the signal connection board 40 serially connecting all the first receiving cards 131 and all the second receiving cards 132 is complete, and both ends of the loop, that is Figure 5 the A end and the B end shown, are conducting; when any one of several cabinets 60 is in the open state, the loop formed by the signal connection board 40 serially connecting all the first receiving cards 131 and all the second receiving cards 132 is incomplete, and both ends of the loop, that is Figure 5 the A end and the B end shown, are not conducting.

[0072] Optionally, the first wire 411 in this embodiment may specifically be an FFC wire (Flexible Flat Cable). Since the sending card 30 itself is connected to the receiving card 13 through an FFC wire to achieve data transmission, the first wire 411 may specifically be an idle PIN pair (pin pair) of the FFC wire. In this embodiment, by using the idle PIN pair of the FFC wire to connect the signal connection board 40 and the receiving card 13, no additional wire needs to be added, which can reduce production costs and simplify circuit connections.

[0073] Optionally, the second wire 412 and the third wire 413 in this embodiment may be conventional wires, as long as they are consistent with the terminal model of the signal connection board 40.

[0074] Specifically, as Figure 5 shown, the LED display system 1 in this embodiment includes 12 boxes 60, and the 12 boxes 60 are arranged in a 4*3 matrix. Among them, the first receiving card 131 in each box 60 is arranged on the left side, and the second receiving card 132 is arranged on the right side.

[0075] The first receiving card 131 and the second receiving card 132 in each box 60 in the first row are connected in series, and the first receiving card 131 and the second receiving card 132 in each box 60 in the remaining rows are connected in parallel. The third signal terminal 43 of the signal connection board 40 on the leftmost side is short-circuited, and the fourth signal terminal 44 of the signal connection board 40 on the rightmost side is short-circuited, so that the A end is connected to the B end through a plurality of signal connection boards 40, a plurality of first receiving cards 131, and a plurality of second receiving cards 132.

[0076] Optionally, the LED display system 1 in this embodiment may also be designed with other sizes. For example, a plurality of boxes 60 arranged in a 6*6 matrix, or a plurality of boxes 60 arranged in a 10*10 matrix, etc., can meet the specification requirements of different cinemas for LED cinema screens.

[0077] The LED display system 1 in this embodiment is composed of a plurality of LED cinema screens spliced together. Therefore, it is only necessary to detect whether the connection wires between the boxes 60 are normal, that is, to detect whether the wires are connected. When a function abnormality occurs, the operation and maintenance personnel only need to use a voltmeter to measure the continuity, and do not need professional operations such as connecting a computer to read data and analyze data, making the LED display system 1 have the characteristics of easy maintenance.

[0078] Combined with Figures 1 - 3 and Figure 5 , further refer to Figure 4 , Figure 4 is a schematic structural diagram of an embodiment of the isolation circuit of the present application. As Figure 4As shown in the figure, the isolation circuit 20 of this embodiment includes an optocoupler U, a first resistor R1, a second resistor R2, and a capacitor C.

[0079] Specifically, one end of the first resistor R1 is connected to the sending card 30 to receive the detection voltage V1. Optionally, the detection voltage V1 can be the voltage led out by the sending card 30, or the pull-up voltage of the sending card 30, which can be set to 3.3V. The other end of the first resistor R1 is connected to one end of the capacitor C and one end of the opening / closing detection circuit 10. The other end of the opening / closing detection circuit 10 is connected to the first end of the optocoupler U. The second end of the optocoupler U is grounded, and the other end of the capacitor C is further grounded. Optionally, the capacitor C of this embodiment can prevent the optocoupler U from being mis-conducted due to voltage fluctuations of the detection voltage.

[0080] One end of the second resistor R2 receives the pull-up voltage V2. Specifically, the pull-up voltage V2 can be the pull-up voltage of the server 50, which can be set to 3.3V. The other end of the second resistor R2 is connected to the first end of the server 50 and the third end of the optocoupler U. Among them, the third end of the optocoupler U is the voltage detection pin. The fourth end of the optocoupler U is further grounded, and the second end of the server 50 is further grounded.

[0081] Among them, the opening / closing detection circuit 10 can be equivalent to a switch. The two ends of the opening / closing detection circuit 10 can be the A end and the B end described in the above embodiment. When all the boxes 60 are in the closed state, the A end and the B end are connected, that is, the switch is closed and conducted. At this time, the left side of the optocoupler U is conducted, and then the right side of the optocoupler U is controlled to be conducted. The voltage at the third end of the optocoupler U is pulled down, that is, the voltage detection pin of the optocoupler U is pulled down. The comparator inside the server 50 detects that the voltage is lower than the set value, then it is judged that the safety door is closed normally and the server 50 runs normally.

[0082] When any one of the boxes 60 is opened, the A end and the B end are not connected, that is, the switch is disconnected. The left end of the optocoupler U is not conducted, and then the right end of the optocoupler U is controlled not to be conducted. The voltage at the third end of the optocoupler U is pulled up by the second resistor R2, that is, the voltage detection pin of the optocoupler U is pulled up. The comparator inside the server 50 detects that the voltage is higher than the set value, and it is judged that the safety door is opened and the server 50 stops running.

[0083] In this embodiment, by setting the isolation circuit 20 connecting the opening / closing detection circuit 10 and the server 50, it can not only achieve electrical isolation between the server 50 and the LED cinema screen, prevent strong electrical signals such as lightning strikes and surges from being coupled to the screen detection line and damaging the detection IO pins of the movie server 50, ensuring the safe use of the server 50; at the same time, it ensures that the detection principle of the comparator of the server 50 is not affected by the abnormal impedance of the connection line caused by different installation environments of the LED cinema screen, resulting in abnormal safety door detection problems, and can effectively improve the reliability and safety of the LED display system 1 of this application.

[0084] The cabinet 60 of the LED cinema screen of the present application is opened and closed through a mechanical switch. The opening and closing detection circuit 10 detects the opening and closing of the mechanical switch, and thus realizes the detection of the opening and closing state of the cabinet 60. Since a mechanical switch is used, its detection method is different from that of a circuit that requires the use of multiple sensors. Moreover, the circuit structure of the opening and closing detection circuit 10 of the present application is simple and the cost is low. At the same time, the present application further sets an isolation circuit 20 to connect the server 50 and the opening and closing detection circuit 10, and uses the isolation circuit 20 to achieve electrical isolation between the server 50 and the LED cinema screen, ensuring the safe use of the server 50 and further improving the security of the LED display system 1 of the present application.

[0085] The above are only embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. An LED display system, characterized in that, The LED display system includes: An opening / closing detection circuit, which is disposed inside the box body of the LED cinema screen. The box body is opened and closed through a mechanical switch, and the opening / closing detection circuit is used to detect the switch of the mechanical switch to detect the opening / closing state of the box body; An isolation circuit, connected to the opening / closing detection circuit and the server, for realizing electrical isolation between the LED cinema screen and the server; A sending card, connected to the isolation circuit, for transmitting a detection voltage to the isolation circuit. The server starts or stops running based on the detection voltage and the opening / closing state of the box body.

2. The LED display system according to claim 1, wherein The opening / closing detection circuit includes: Three switch plates, and the three switch plates form the mechanical switch; A detection plate, which is serially arranged with the three switch plates, and the detection plate and the three switch plates form a connected loop; A receiving card, connected to the detection plate through an interface; Wherein, when the three switch plates are all in the pressed state, both sides of the switch plate are conducting, and the receiving card is conducting with the three switch plates through the detection plate.

3. The LED display system according to claim 2, wherein The three switch plates include: A first switch plate, disposed on the first side of the box body; A second switch plate, disposed on the second side of the box body, wherein the first side and the second side are opposite sides of the box body along the length direction or the width direction; A third switch plate, disposed on the third side of the box body, and the third side of the box body is adjacent to the first side and the second side of the box body respectively.

4. The LED display system according to claim 2, wherein Each switch plate includes two tactile switches, and the two tactile switches are arranged in parallel.

5. The LED display system according to claim 2, wherein, The receiving card includes: A first receiving card, provided with a first interface, and the first interface is short-circuited through a wire; A second receiving card, provided with a second interface, and the second receiving card is connected to the detection plate through the second interface; Wherein, the first receiving card and the second receiving card are arranged in parallel.

6. The LED display system according to claim 5, wherein The LED display system includes a plurality of the box bodies, and the plurality of box bodies are arranged in a matrix. The matrix is an N*M matrix, and each box body is provided with the opening / closing detection circuit, and a plurality of the opening / closing detection circuits are arranged in series; where N and M are integers greater than 0.

7. The LED display system according to claim 6, wherein The first receiving cards in the adjacent two rows of the box bodies located in the m-th column are arranged in series; where m is an integer greater than 0 and less than or equal to M; The second receiving cards in the adjacent two rows of the box bodies located in the m-th column are arranged in series; The first receiving card and the second receiving card in each box body located in the first row are arranged in series; The first receiving card and the second receiving card in each box body located in the n-th row are arranged in parallel; where n is an integer greater than 1 and less than or equal to N.

8. The LED display system according to claim 6, wherein The opening / closing detection circuit further includes a signal connection board, and the signal connection board is respectively connected to the first receiving card and the second receiving card in the box body located in the N-th row.

9. The LED display system according to claim 8, wherein The number of the signal connection boards is M, and the signal connection board includes: A first signal terminal, connected to the first receiving card in the box body located in the N-th row and the m-th column through a first wire; The second signal terminal is connected to the second receiving card in the box at the Nth row and the mth column through the first wire; The third signal terminal is connected to the first signal terminal through a second wire; The fourth signal terminal is connected to the second signal terminal through the second wire; the third signal terminal and the fourth signal terminal are respectively connected to the signal connection plates on both sides of the signal connection plate through a third wire; Wherein, the third signal terminal or the fourth signal terminal of the signal connection plate at the end side is short-circuited so that the signal connection plate connects all the first receiving cards and all the second receiving cards in series.

10. The LED display system according to claim 1, characterized in that, The isolation circuit includes an optocoupler, a first resistor, a second resistor, and a capacitor; Wherein, one end of the first resistor is connected to the sending card to receive the detection voltage, the other end of the first resistor is connected to one end of the capacitor and one end of the opening and closing detection circuit, the other end of the opening and closing detection circuit is connected to the first end of the optocoupler, the second end of the optocoupler is grounded, and the other end of the capacitor is further grounded; One end of the second resistor receives a pull-up voltage, the other end of the second resistor is connected to the first end of the server and the third end of the optocoupler, the fourth end of the optocoupler is further grounded, and the second end of the server is further grounded.

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