A control signal conversion device and control method for splicing screen

Abstract

The present invention discloses a control signal conversion device and control method for a splicing screen, the device comprising: a first conversion module, a second conversion module, an input interface module and an output interface module; the first conversion module is used to receive a first signal from a display main chip, and transmit it to the second conversion module or the output interface module after level conversion, and is used to receive a signal from the input interface module and receive a return signal from the next display through the second input terminal; the second conversion module can convert the level of the control signal to a level that meets the requirements of the first conversion module, and transmit it to the first conversion module; the input interface module and the output interface module are respectively used to receive the signal of the previous display and transmit the signal to the next display. By adopting the embodiment of the present invention, the loop-in and loop-out of the splicing screen can be realized, which can not only realize the control of all displays of the splicing screen, but also receive the return signals of all displays.

Description

Technical Field

[0001] The present invention relates to the field of splicing screen display systems, and in particular to a control signal conversion device and a control method for a splicing screen. Background Art

[0002] In the field of splicing screens, in order to obtain a large-size display screen, multiple small-size borderless displays can be spliced ​​together to achieve this; on this basis, after the software processes the effects of each display screen, the splicing screen can display a complete picture. Among them, each display screen can be controlled by an infrared remote control or through RS232; all displays in the splicing screen can be controlled by using an infrared remote control; the first display in the splicing screen can be connected to the computer via an RS232 cable to enable the computer to control all displays in the splicing screen. The existing technology mainly connects the RX signals of RS232 in each display in series to realize the splicing screen, so as to control all displays in the splicing screen; but since the TX signals of other displays are suspended except the first display, only the return signal of the first display can be received, and the return signals of other displays cannot be received, and then the computer end cannot know whether all displays have received the control command. When some displays cannot successfully execute the command due to environmental interference problems, it is necessary to manually observe and judge whether the execution is successful. Summary of the invention

[0003] The present invention provides a control signal conversion device and a control method for a spliced ​​screen, so as to solve the technical problem that the prior art cannot realize signal feedback of all displays in the spliced ​​screen, and thus cannot realize stable control of the spliced ​​screen.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a control signal conversion device for a spliced ​​screen, comprising: a first conversion module, a second conversion module, an input interface module and an output interface module;

[0005] The first input end of the first conversion module is connected to the main chip of the display, the second input end of the first conversion module is connected to the main chip of the next display, and the first control end and the second control end of the first conversion module are respectively connected to the first output end and the second output end of the second conversion module; wherein the second input end of the first conversion module receives the return signal of the next display;

[0006] The input end of the second conversion module is connected to the control terminal; wherein the input end of the second conversion module receives an input signal of the control terminal;

[0007] The interface end of the input interface module is connected to the output interface of the previous display or the control terminal, and the signal end of the input interface module is respectively connected to the first receiving end and the first transmitting end of the first conversion module;

[0008] The interface end of the output interface module is connected to the input interface of the next display, and the signal end of the output interface module is respectively connected to the second receiving end and the second transmitting end of the first conversion module.

[0009] In the present invention, the first conversion chip is turned on through the power supply pin and the ground pin, and the second input end of the first conversion module is connected to the main control chip of the next display through the input pin to receive the feedback signal of the next display to realize the feedback of the signal; the third input pin and the third output pin of the first input module are connected to the signal end of the input interface module to realize the connection with the output end or the control terminal of the previous display; the fourth input pin and the fourth output pin of the first input module are connected to the signal end of the output interface module to realize the connection with the input end of the next display to realize the loop connection of the splicing screen; on this basis, the second input pin receives the signal of the control terminal through the second conversion module to realize the stable control of the splicing screen by the control terminal and receive the feedback signal of each display in the splicing screen.

[0010] Furthermore, the first conversion module includes: a first NMOS transistor, a second NMOS transistor, a first resistor, a second resistor and a first conversion chip;

[0011] The gate of the first NMOS tube is connected to the first input end of the first conversion module, the source of the first NMOS tube is connected to the circuit ground, and the drain of the first NMOS tube is connected to the gate of the second NMOS tube and the first end of the first resistor;

[0012] The source of the second NMOS tube is grounded, and the drain of the second NMOS tube is connected to the first end of the second resistor, the first input pin of the first conversion chip, the first output pin of the first conversion chip, and the second input end of the first conversion module;

[0013] The second end of the first resistor is connected to the second end of the second resistor and a first voltage source;

[0014] The second input pin, third input pin, fourth input pin, second output pin, third output pin, fourth output pin, power supply pin and ground pin of the first conversion chip are respectively connected to the first control end, first receiving end, second receiving end, second control end, first transmission end, second transmission end of the first conversion module, and the first voltage source and circuit ground.

[0015] In the present invention, when the first input end receives a high level, the first NMOS tube is turned on to pull down the gate voltage of the second NMOS tube, and the second NMOS tube is turned off, so that the first input pin and the first output pin are at a high level; when the first input pin and the second input pin are at a high level, the third output pin and the third input pin of the first conversion chip are at a high level; only the first NMOS tube, the second NMOS tube, the first resistor, and the second resistor are used in combination with the first conversion chip to realize the processing of the input signal of the main chip of the display, thereby reducing the design cost of realizing the splicing screen loop connection.

[0016] Further, the first conversion module further includes: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor;

[0017] A first end of the fourth resistor is connected to the input end of the first conversion module, and a second end of the fourth resistor is connected to the gate of the first NMOS transistor;

[0018] A first end of the fifth resistor is connected to the drain of the first NMOS transistor and a first end of the first resistor, and a second end of the fifth resistor is connected to the gate of the second NMOS transistor;

[0019] The first end of the sixth resistor is connected to the drain of the second NMOS tube, the first end of the second resistor and the first end of the seventh resistor, and the second end of the sixth resistor is connected to the first input pin of the first conversion chip;

[0020] The second end of the seventh resistor is connected to the first end of the eighth resistor and the first output pin of the first conversion chip;

[0021] The second end of the eighth resistor is connected to the second input end of the first conversion module;

[0022] A first end of the ninth resistor is connected to the first control end of the first conversion module, and a second end of the ninth resistor is connected to the second input pin of the first conversion chip;

[0023] A first end of the tenth resistor is connected to the second output pin of the first conversion chip, and a second end of the tenth resistor is connected to the second control end of the first conversion module.

[0024] The fourth resistor to the tenth resistor in the present invention are current limiting resistors of the first conversion module, which improve the working stability of the first conversion module, make the signal transmission of the looped display more stable, and further achieve stable control of the spliced ​​screen.

[0025] Furthermore, the first conversion module further includes: a magnetic bead and a first capacitor;

[0026] The first end of the magnetic bead is connected to the power supply pin of the first conversion chip and the first end of the first capacitor;

[0027] The second end of the magnetic bead is connected to the first voltage source;

[0028] The second end of the first capacitor is connected to the ground pin and the circuit ground.

[0029] The present invention arranges a magnetic bead at the power supply pin and connects a first capacitor between the power supply pin and the ground pin to suppress electromagnetic interference of the input voltage, filter the input voltage, and ensure stable operation of the first conversion module.

[0030] Furthermore, the second conversion module includes: a third NMOS transistor, a fourth NMOS transistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a second conversion chip;

[0031] The drain of the third NMOS tube is connected to the input end of the second conversion module;

[0032] The gate of the third NMOS tube is connected to the first end of the eleventh resistor, the first end of the twelfth resistor and the gate of the fourth NMOS tube;

[0033] The source of the third NMOS tube is connected to the first input pin of the second conversion chip and the second end of the eleventh resistor;

[0034] The source of the fourth NMOS tube is connected to the first control pin of the second conversion chip and the second end of the twelfth resistor;

[0035] The drain of the fourth NMOS tube is connected to the first output end of the second conversion module and the first end of the thirteenth resistor;

[0036] The second end of the thirteenth resistor is connected to the first voltage source;

[0037] The power supply pin of the second conversion chip is connected to the second voltage source, the output pin of the second conversion chip is connected to the second output end of the second conversion module, and the second control pin of the second conversion chip is electrically connected to the control signal.

[0038] The third NMOS tube and the fourth NMOS tube, the eleventh resistor, the twelfth resistor, and the thirteenth resistor in the present invention are connected to form a level conversion circuit; the second conversion chip selects one of the first input pin and the second input pin through the first control pin according to the control signal received by the second control pin, as the signal of the output pin; the signal of the control terminal is converted into a signal that meets the interface requirements of the first control chip in the first control module, thereby realizing the control of the splicing screen by the control terminal.

[0039] Further, the second conversion module further includes: a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a seventeenth resistor;

[0040] The first end of the fourteenth resistor is connected to the second output end of the second conversion module;

[0041] The second end of the fourteenth resistor is connected to the output pin of the second conversion chip;

[0042] The first end of the fifteenth resistor is connected to the second control pin of the second conversion chip and the first end of the sixteenth resistor;

[0043] The second end of the fifteenth resistor is electrically connected to the control signal;

[0044] The second end of the sixteenth resistor is connected to the circuit ground;

[0045] The first end of the seventeenth resistor is connected to the power supply pin of the second conversion chip, the gate of the third NMOS tube, the gate of the fourth NMOS tube, the first end of the eleventh resistor and the first end of the twelfth resistor;

[0046] The second end of the seventeenth resistor is connected to the second voltage source.

[0047] The fourteenth resistor to the seventeenth resistor in the present invention are current limiting resistors of the second conversion chip, which protect the pins of the second conversion chip, thereby making the second conversion chip work in a stable state.

[0048] Furthermore, the second conversion module further includes: a second capacitor and a third capacitor;

[0049] The first end of the second capacitor is connected to the first end of the third capacitor, the first end of the seventeenth resistor, the power supply pin of the second conversion chip, the gate of the third NMOS tube, the gate of the fourth NMOS tube, the first end of the eleventh resistor and the first end of the twelfth resistor;

[0050] The second end of the second capacitor is connected to the second end of the third capacitor and a circuit ground.

[0051] The second capacitor and the third capacitor in the present invention achieve filtering of the second input voltage. In addition, connecting two capacitors in parallel reduces the design cost generated by using large capacitors.

[0052] Further, the input interface module includes: a first electrostatic protection device and a second electrostatic protection device;

[0053] Wherein, the signal end of the input interface module includes: a receiving end and a transmitting end;

[0054] The receiving end of the input interface module is connected to the first receiving end of the first conversion module, and the transmitting end of the input interface module is connected to the first transmitting end of the first conversion module;

[0055] The first end of the first electrostatic protection device is connected to the receiving end of the input interface module and the interface end of the input interface module;

[0056] The first end of the second electrostatic protection device is connected to the transmission end of the input interface module and the interface end of the input interface module.

[0057] Further, the output interface module includes: a third electrostatic protection device and a fourth electrostatic protection device;

[0058] Wherein, the signal end of the output interface module includes: a receiving end and a transmitting end;

[0059] The receiving end of the output interface module is connected to the second receiving end of the first conversion module, and the transmitting end of the input interface module is connected to the second transmitting end of the first conversion module;

[0060] The first end of the third electrostatic protection device is connected to the receiving end of the output interface module and the interface end of the output interface module;

[0061] The first end of the fourth electrostatic protection device is connected to the transmission end of the output interface module and the interface end of the output interface module.

[0062] The input interface module and the output interface module of the present invention are respectively used to connect to the previous display and the next display to realize the splicing screen ring connection; in addition, the electrostatic protection devices of the two modules can protect the pins of the first conversion chip, so that the first conversion chip works in a stable state.

[0063] On the other hand, an embodiment of the present invention further provides a control method for a spliced ​​screen, which is applied to the control signal conversion device for a spliced ​​screen described in an embodiment of the present invention, comprising: according to the control terminal, setting an ID for each display in the spliced ​​screen, and receiving a return signal of the display corresponding to the ID according to the ID, specifically:

[0064] Wherein, the spliced ​​screen includes N displays; the spliced ​​screen is a rectangular screen formed by splicing j×k displays through cables, wherein j is the number of displays in each row of the spliced ​​screen, and k is the number of rows of displays in the spliced ​​screen; and each display includes the control signal conversion device for the spliced ​​screen; N≥2, j×k=N;

[0065] Obtain the number j of displays in each row of the spliced ​​screen and the number k of rows of the spliced ​​screen;

[0066] Set the display at the endpoint of the mth row as the first display unit, and set the ID of the display to m-1; start from the display at the endpoint of the first row and set it to the other end in sequence until the ID of the display at the other endpoint of the mth row is set to mj; where 1≤m≤k;

[0067] According to the IDm-l of the display, the lth display in the mth row is designated to send a return signal; wherein, 1≤l≤j.

[0068] The present invention sorts each display in the spliced ​​screen by rows and columns according to preset rules, and sets a unique ID for each display. Through the ID corresponding to each display and the control signal conversion device for the spliced ​​screen, the return signal of any specified display can be called up, avoiding the problem of being unable to find a specific faulty display due to environmental interference, and realizing stable control of the spliced ​​screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 A schematic diagram of the connection relationship of an embodiment of a control signal conversion device for a spliced ​​screen provided by an embodiment of the present invention;

[0070] Figure 2 A schematic diagram of the connection relationship of an embodiment of the first conversion module provided in an embodiment of the present invention;

[0071] Figure 3 A schematic diagram of the connection relationship of an embodiment of the second conversion module provided in an embodiment of the present invention;

[0072] Figure 4 A schematic diagram of the connection relationship of an embodiment of the input interface module provided by an embodiment of the present invention;

[0073] Figure 5 A schematic diagram of the connection relationship of an embodiment of the output interface module provided by the embodiment of the present invention;

[0074] Figure 6 A schematic diagram of the connection relationship of an embodiment of a spliced ​​screen provided by an embodiment of the present invention;

[0075] Figure 7 A schematic diagram of the connection relationship of another embodiment of the spliced ​​screen provided by the embodiment of the present invention;

[0076] Figure 8 A schematic flow chart of an embodiment of a control method for a spliced ​​screen provided in an embodiment of the present invention.

[0077] Among them, the figure numbers of the drawings in the specification are as follows: 101: first conversion module, 102: second conversion module, 103: input interface module, 104: output interface module, 105: control terminal 105, 106: previous display, 107: next display, 1011: first input end, 1012: second input end, 1013: first control end, 1014: second control end, 1015: first receiving end, 1016: first transmission end, 1017: second receiving end, 1018: second transmission end, 1021: first output end, 1022: second output end, 1023: input end of the second conversion module, 1031: signal end of the input interface module, 1032: interface end of the input interface module, 1041: signal end of the output interface module, 1042: interface end of the output interface module. DETAILED DESCRIPTION

[0078] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0079] Embodiment 1

[0080] Please refer to Figure 1 , a schematic diagram of the connection relationship of an embodiment of a control signal conversion device for a spliced ​​screen provided by an embodiment of the present invention, comprising: a first conversion module 101, a second conversion module 102, an input interface module 103 and an output interface module 104;

[0081] Wherein, the first input terminal 1011 of the first conversion module 101 is connected to the main chip of the display, the second input terminal 1012 of the first conversion module 101 is connected to the main chip of the next display, and the first control terminal 1013 and the second control terminal 1014 of the first conversion module 101 are respectively connected to the first output terminal 1021 and the second output terminal 1022 of the second conversion module 102; wherein, the first conversion module 101 is used to receive the first signal of the main chip of the display, and after level conversion of the first signal of the main chip, transmit it to the second conversion module 102 or the output interface module 104; and is used to receive the second signal from the input interface module 103 and receive the return signal of the next display through the second input terminal 1012 of the first conversion module 101;

[0082] The input end 1023 of the second conversion module 102 is connected to the control terminal 105; wherein the input end 1023 of the second conversion module 102 receives the control signal of the control terminal 105; the second conversion module 102 is used to convert the level of the control signal into a level that meets the interface requirements of the first conversion module 101, and transmit it to the first conversion module 101;

[0083] The signal interface terminal 1032 of the input interface module 103 is connected to the output interface of the previous display 106, and the signal terminal 1031 of the input interface module 103 is respectively connected to the first receiving terminal 1015 and the first transmitting terminal 1016 of the first conversion module 101; wherein, the input interface module 103 is used to transmit the second signal of the previous display 106 to the first conversion module 101.

[0084] The interface end 1042 of the output interface module 104 is connected to the input interface of the next display, and the signal end 1041 of the output interface module 104 is respectively connected to the second receiving end 1017 and the second transmitting end 1018 of the first conversion module 101; wherein, the output interface module 104 is used to transmit the signal generated by the first conversion module 101 to the next display.

[0085] In this embodiment, the control signal conversion device for the splicing screen is installed in each display of the splicing screen. The first conversion module 101 is connected to the main chip of the display to receive the first signal of the main chip, and then the first signal level is converted, and the level-converted signal is transmitted to the next display through the output interface module 104; the first conversion module 101 is connected to the second conversion module 102 through the first control terminal 1013 and the second control terminal 1014, and the signal interaction with the control terminal 105 is realized through the second conversion module 102. The second conversion module 102 is used to convert the level of the control signal of the control terminal 105 into a level that meets the interface requirements of the first conversion module 101. The input interface module 103 can receive the second signal sent by the previous display 106, and transmit the second signal to the first conversion module 101. In addition, the first conversion module 101 is also connected to the main chip of the next display through the second input interface to receive the return signal of the next display. Therefore, the input interface module 103, the output interface module 104 and the first conversion module 101 of the control signal conversion device are used to realize the loop-in and loop-out of each display in the splicing screen, and the control terminal 105 controls all the displays of the splicing screen in combination with the second control module; in addition, the input interface module 103 and the output interface module 104 can use the RS232 interface to realize the connection between displays, or between the display and the control terminal 105; wherein the control terminal 105 can be a computer; the signal interface terminal 1032 of the input interface module 103 can also be connected to the control terminal 105 to transmit the second signal of the control terminal 105 to the first conversion module 101.

[0086] Please refer to Figure 2 , is a schematic diagram of the connection relationship of an embodiment of the first conversion module 101 provided in an embodiment of the present invention. The first conversion module 101 includes: a first NMOS transistor QL2, a second NMOS transistor QL3, a first resistor RL28, a second resistor RL30 and a first conversion chip UL5;

[0087] The gate of the first NMOS transistor QL2 is connected to the first input terminal 1011 of the first conversion module 101, the source of the first NMOS transistor QL2 is connected to the circuit ground, and the drain of the first NMOS transistor QL2 is connected to the gate of the second NMOS transistor QL3 and the first end of the first resistor RL28;

[0088] The source of the second NMOS transistor QL3 is grounded, and the drain of the second NMOS transistor QL3 is connected to the first end of the second resistor RL30, the first input pin T2IN of the first conversion chip UL5, the first output pin R1OUT of the first conversion chip UL5, and the second input end 1012 of the first conversion module;

[0089] The second end of the first resistor RL28 is connected to the second end of the second resistor RL30 and the first voltage source +5V_Standby;

[0090] The second input pin T1IN, the third input pin R2IN, the fourth input pin R1IN, the second output pin R2OUT, the third output pin T2OUT, the fourth output pin T1OUT, the power supply pin Vcc and the ground pin GND of the first conversion chip UL5 are respectively connected to the first control terminal 1013, the first receiving terminal 1015, the second receiving terminal 1017, the second control terminal 1014, the first transmission terminal 1016, the second transmission terminal 1018 of the first conversion module 101, and the first voltage source +5V_Standby and the circuit ground.

[0091] In this embodiment, when the first input terminal 1011 receives a high level, the first NMOS transistor QL2 is turned on to pull down the gate voltage of the second NMOS transistor QL3, and the second NMOS transistor QL3 is turned off, so that the first input pin T2IN and the first output pin R1OUT are at a high level; when the first input pin T2IN and the second input pin T1IN are at a high level, the third output pin T2OUT and the fourth input pin R1IN of the first conversion chip UL5 are at a high level. When the first input terminal 1011 receives a low level, the first NMOS transistor QL2 is turned off, so that the gate of the second NMOS transistor QL3 is pulled up to a high level through the second resistor RL30, and then the second NMOS transistor QL3 is turned on, so that the first input pin T2IN and the second input pin T1IN are at a low level, and the third output pin T2OUT and the fourth input pin R1IN of the first conversion module 101 are at a low level. The present invention only uses the first NMOS tube QL2, the second NMOS tube QL3, the first resistor RL28, the second resistor RL30, and the first conversion chip UL5 to process the input signal of the main chip of the display. In addition, in order to realize the RX signal series connection and the TX signal return, the existing signal conversion device needs to use more gate hardware circuits, while the present invention only uses the first NMOS tube QL2, the second NMOS tube QL3, the first resistor RL28, the second resistor RL30 and the first conversion chip UL5 to realize the main chip signal transmission and the signal return of the next display, thereby reducing the design cost of realizing the splicing screen loop connection.

[0092] Further, the first conversion module 101 further includes: a fourth resistor RL32, a fifth resistor RL31, a sixth resistor RL34, a seventh resistor RL33, an eighth resistor RL139, a ninth resistor RL138 and a tenth resistor RL112;

[0093] A first end of the fourth resistor RL32 is connected to the input end of the first conversion module, and a second end of the fourth resistor RL32 is connected to the gate of the first NMOS transistor QL2;

[0094] A first end of the fifth resistor RL31 is connected to the drain of the first NMOS transistor QL2 and a first end of the first resistor RL28, and a second end of the fifth resistor RL31 is connected to the gate of the second NMOS transistor QL3;

[0095] A first end of the sixth resistor RL34 is connected to the drain of the second NMOS transistor QL3, a first end of the second resistor RL30 and a first end of the seventh resistor RL33, and a second end of the sixth resistor RL34 is connected to the first input pin T2IN of the first conversion chip UL5;

[0096] The second end of the seventh resistor RL33 is connected to the first end of the eighth resistor RL139 and the first output pin R1OUT of the first conversion chip UL5;

[0097] The second end of the eighth resistor RL139 is connected to the second input end 1012 of the first conversion module 101;

[0098] A first end of the ninth resistor RL138 is connected to the first control end 1013 of the first conversion module 101, and a second end of the ninth resistor RL138 is connected to the second input pin T1IN of the first conversion chip UL5;

[0099] A first end of the tenth resistor RL112 is connected to the second output pin R2OUT of the first conversion chip UL5 , and a second end of the tenth resistor RL112 is connected to the second control end 1014 of the first conversion module 101 .

[0100] The fourth resistor RL32 to the tenth resistor RL112 in the present invention are current limiting resistors of the first conversion module 101, which improve the working stability of the first conversion module 101, make the signal transmission of the looped display more stable, and further achieve stable control of the spliced ​​screen.

[0101] Furthermore, the first conversion module 101 further includes: a magnetic bead FBL1 and a first capacitor CL48;

[0102] The first end of the magnetic bead FBL1 is connected to the power supply pin Vcc of the first conversion chip UL5 and the first end of the first capacitor CL48;

[0103] The second end of the magnetic bead FBL1 is connected to the first voltage source +5V_Standby;

[0104] A second end of the first capacitor CL48 is connected to the ground pin GND and the circuit ground.

[0105] In this embodiment, the first voltage source +5V_Standby can be 5V; in addition, a magnetic bead FBL1 is set at the power supply pin Vcc, and a first capacitor CL48 is connected between the power supply pin Vcc and the ground pin GND to suppress electromagnetic interference of the input voltage and filter the input voltage to ensure stable operation of the first conversion module 101.

[0106] In this embodiment, the first conversion module 101 further includes: a first charge pump capacitor CL45, a second charge pump capacitor CL46, a third charge pump capacitor CL2 and a fourth charge pump capacitor CL49;

[0107] Wherein, a first end of the first charge pump capacitor CL45 is connected to a pin C1+ of the first conversion chip, and a second end of the first charge pump capacitor CL45 is connected to a pin C1- of the first conversion chip;

[0108] A first end of the second charge pump capacitor CL46 is connected to a pin C2+ of the first conversion chip, and a second end of the second charge pump capacitor CL46 is connected to a pin C2- of the first conversion chip;

[0109] A first end of the third charge pump capacitor CL2 is connected to the pin V+ of the first conversion chip, and a second end of the third charge pump capacitor CL2 is connected to the circuit ground;

[0110] A first end of the third charge pump capacitor CL49 is connected to the pin V- of the first conversion chip, and a second end of the third charge pump capacitor CL49 is connected to the circuit ground.

[0111] In this embodiment, the first charge pump capacitor CL45, the second charge pump capacitor CL46, the third charge pump capacitor CL2, the fourth charge pump capacitor CL49 and pin C1+, pin C1-, pin C2+, pin C2-, pin V+, pin V- together constitute a charge pump circuit to provide a serial port level for the input interface module 103 or the output interface module 104.

[0112] Please refer to Figure 3 , is a schematic diagram of the connection relationship of an embodiment of the second conversion module 102 provided in an embodiment of the present invention. The second conversion module 102 includes: a third NMOS transistor QL7, a fourth NMOS transistor QL17, an eleventh resistor RL60, a twelfth resistor RL146, a thirteenth resistor RL145 and a second conversion chip UL7;

[0113] The drain of the third NMOS transistor QL7 is connected to the input terminal 1023 of the second conversion module 102;

[0114] The gate of the third NMOS transistor QL7 is connected to the first end of the eleventh resistor RL60, the first end of the twelfth resistor RL146 and the gate of the fourth NMOS transistor QL17;

[0115] The source of the third NMOS transistor QL7 is connected to the first input pin B1 of the second conversion chip UL7 and the second end of the eleventh resistor RL60;

[0116] The source of the fourth NMOS transistor QL17 is connected to the first control pin A of the second conversion chip UL7 and the second end of the twelfth resistor RL146;

[0117] The drain of the fourth NMOS tube is connected to the first output terminal 1021 of the second conversion module 102 and the first end of the thirteenth resistor RL145;

[0118] A second end of the thirteenth resistor RL145 is connected to the first voltage source +5V_Standby;

[0119] The power supply pin VCC of the second conversion chip UL7 is connected to the second voltage source +3.3V_Standby, the output pin of the second conversion chip UL7 is connected to the second output end 1022 of the second conversion module 102, and the second control pin of the second conversion chip UL7 is electrically connected to the control signal.

[0120] In this embodiment, the third NMOS tube QL7 and the fourth NMOS tube QL17, the eleventh resistor RL60, the twelfth resistor RL146, and the thirteenth resistor RL145 are connected to form a level conversion circuit; the second conversion chip UL7 selects one of the first input pin B1 and the second input pin B2 through the first control pin A as the signal of the output pin according to the control signal received by the second control pin; the signal of the control terminal is converted into a signal that meets the interface requirements of the first conversion chip UL5 in the first conversion module 101, thereby realizing the control of the splicing screen by the control terminal; in addition, the voltage of the second voltage source +3.3V_Standby can be a 3.3V standard voltage.

[0121] Further, the second conversion module 102 further includes: a fourteenth resistor RL58, a fifteenth resistor RL57, a sixteenth resistor RL65 and a seventeenth resistor RL56;

[0122] A first end of the fourteenth resistor RL58 is connected to the second output end 1022 of the second conversion module 102;

[0123] The second end of the fourteenth resistor RL58 is connected to the output pin of the second conversion chip UL7;

[0124] A first end of the fifteenth resistor RL57 is connected to the second control pin of the second conversion chip UL7 and a first end of the sixteenth resistor RL65;

[0125] The second end of the fifteenth resistor RL57 is electrically connected to the control signal;

[0126] The second end of the sixteenth resistor RL65 is connected to the circuit ground;

[0127] The first end of the seventeenth resistor RL56 is connected to the power supply pin VCC of the second conversion chip UL7, the gate of the third NMOS transistor QL7, the gate of the fourth NMOS transistor QL17, the first end of the eleventh resistor RL60 and the first end of the twelfth resistor RL146;

[0128] The second end of the seventeenth resistor RL56 is connected to the second voltage source +3.3V_Standby.

[0129] The fourteenth resistor RL58 to the seventeenth resistor RL56 in the present invention are current limiting resistors of the second conversion chip UL7, which protect the pins of the second conversion chip UL7, thereby making the second conversion chip UL7 work in a stable state.

[0130] Furthermore, the second conversion module 102 further includes: a second capacitor CL17 and a third capacitor CL18;

[0131] The first end of the second capacitor CL17 is connected to the first end of the third capacitor CL18, the first end of the seventeenth resistor RL56, the power supply pin VCC of the second conversion chip UL7, the gate of the third NMOS transistor QL7, the gate of the fourth NMOS transistor QL17, the first end of the eleventh resistor RL60 and the first end of the twelfth resistor RL146;

[0132] A second end of the second capacitor CL17 is connected to a second end of the third capacitor CL18 and a circuit ground.

[0133] The second capacitor CL17 and the third capacitor CL18 in the present invention achieve filtering of the second input voltage. In addition, connecting two capacitors in parallel reduces the design cost generated by using large capacitors.

[0134] Please refer to Figure 4, is a schematic diagram of the connection relationship of an embodiment of the input interface module 103 provided in an embodiment of the present invention. The input interface module 103 includes: a first electrostatic protection device DL1, a second electrostatic protection device DL2;

[0135] The signal end 1031 of the input interface module 103 includes: a receiving end and a transmitting end;

[0136] The receiving end of the input interface module 103 is connected to the first receiving end 1015 of the first conversion module 101, and the transmitting end of the input interface module 103 is connected to the first transmitting end 1016 of the first conversion module 101;

[0137] The first end of the first electrostatic protection device DL1 is connected to the receiving end of the input interface module 103 and the signal interface end 1032 of the input interface module 103;

[0138] A first end of the second electrostatic protection device DL2 is connected to a transmission end of the input interface module 103 and a signal interface end 1032 of the input interface module 103 .

[0139] In this embodiment, the input interface module 103 further includes: an eighteenth resistor R105 and a nineteenth resistor RL100;

[0140] Wherein, the first end of the eighteenth resistor R105 is connected to the signal interface terminal 1032 of the input interface module 103 and the first end of the first electrostatic protection device DL1;

[0141] The second end of the eighteenth resistor R105 is connected to the receiving end of the input interface module 103;

[0142] The first end of the nineteenth resistor RL100 is connected to the signal interface terminal 1032 of the input interface module 103 and the first end of the second electrostatic protection device DL2;

[0143] The second end of the nineteenth resistor RL100 is connected to the transmission end of the input interface module 103 .

[0144] Figure 5 , is a schematic diagram of the connection relationship of an embodiment of the output interface module 104 provided in an embodiment of the present invention. The output interface module 104 includes: a third electrostatic protection device DL33, a fourth electrostatic protection device DL34;

[0145] The signal end 1041 of the output interface module 104 includes: a receiving end and a transmitting end;

[0146] The receiving end of the output interface module 104 is connected to the second receiving end 1017 of the first conversion module 101, and the transmitting end of the input interface module 103 is connected to the second transmitting end 1018 of the first conversion module 101;

[0147] The first end of the third electrostatic protection device DL33 is connected to the receiving end of the output interface module 104 and the interface end 1042 of the output interface module 104;

[0148] A first end of the fourth electrostatic protection device DL34 is connected to the transmission end of the output interface module 104 and the interface end 1042 of the output interface module 104 .

[0149] In this embodiment, the output interface module 104 further includes: a twentieth resistor RL137 and a twenty-first resistor RL136;

[0150] Wherein, a first end of the twentieth resistor RL137 is connected to the interface end 1042 of the output interface module 104 and a first end of the third electrostatic protection device DL33;

[0151] The second end of the twentieth resistor RL137 is connected to the receiving end of the output interface module 104;

[0152] A first end of the twenty-first resistor RL136 is connected to the interface end 1042 of the output interface module 104 and a first end of the fourth electrostatic protection device DL34;

[0153] A second end of the twenty-first resistor RL136 is connected to the transmission end of the output interface module 104 .

[0154] In this embodiment, the eighteenth resistor R105, the nineteenth resistor RL100, the twentieth resistor RL137 and the twenty-first resistor RL136 are current limiting resistors, which can protect the pins of the first conversion chip UL5.

[0155] The input interface module 103 and the output interface module 104 of the present invention are respectively used to connect to the previous display and the next display to realize the splicing screen loop connection; in addition, the electrostatic protection devices of the two modules can protect the pins of the first conversion chip UL5, so that the first conversion chip UL5 works in a stable state.

[0156] Please refer to Figure 8 , which is a flow chart of an embodiment of a control method for a spliced ​​screen provided by an embodiment of the present invention, mainly includes steps 801 to 803, which are as follows:

[0157] In this embodiment, according to the control terminal, an ID is set for each display in the spliced ​​screen, and a return signal of the display corresponding to the ID is received according to the ID, which specifically includes: step 801-step 803.

[0158] Please refer to Figure 6 , which is a connection relationship diagram of an embodiment of the splicing screen provided by an embodiment of the present invention. Among them, the computer uses an RS232 cable to connect the first display in the splicing screen, and the other displays are connected in series through the cable to connect the RS232 RX signals, so that one computer can control all the displays in the splicing screen; but since the TX signals of the other displays are suspended except for the first display, the return signals of the other displays cannot be transmitted to the computer.

[0159] In this embodiment, the spliced ​​screen includes N displays; the spliced ​​screen is a rectangular screen formed by j×k displays spliced ​​together by cables, wherein j is the number of displays in each row of the spliced ​​screen, and k is the number of rows of displays in the spliced ​​screen; and each display includes the control signal conversion device for the spliced ​​screen; N≥2, j×k=N.

[0160] Please refer to Figure 7 , which is a connection relationship diagram of another embodiment of the splicing screen provided by the embodiment of the present invention. Among them, the return signal or TX signal is transmitted by connecting the first conversion module 101 of a certain display and the main chip of the next display with a cable; a certain display transmits the first signal of the main control chip in the display to the next display through an RS232 cable; in addition, the display and the computer end convert the signal transmitted serially by the USB interface of the computer end into an RS232 signal through an RS232 converter, and then transmit it to the display; in this embodiment, the RS232 converter can be the second conversion module 102.

[0161] In this embodiment, the signal interface end 1032 of the input interface module 103 of the first display is connected to the computer end through a cable, the interface end 1042 of the output interface module 104 of the first display is connected to the signal interface end 1032 of the input interface module 103 of the second display through a cable, and the second input end 1012 of the first conversion module 101 of the first display is connected to the main chip of the second display through a cable;

[0162] The signal interface terminal 1032 of the input interface module 103 of the i-th display is connected to the interface terminal 1042 of the output interface module 104 of the i-1th display via a cable, the interface terminal 1042 of the output interface module 104 of the i-th display is connected to the signal interface terminal 1032 of the input interface module 103 of the i+1th display via a cable, and the second input terminal 1012 of the first conversion module 101 of the i-th display is connected to the main chip of the i+1th display via a cable; wherein 1<i<N;

[0163] The signal interface terminal 1032 of the input interface module 103 of the Nth display is connected to the interface terminal 1042 of the output interface module 104 of the N-1th display via a cable; wherein the second input terminal 1012 of the first conversion module 101 is used to receive the return signal of the main chip of the next display.

[0164] Step 801: Obtain the number j of displays in each row of the spliced ​​screen and the number k of rows of the spliced ​​screen.

[0165] Step 802: Set the display at the endpoint of the mth row as the first display unit, and set the ID of the display to m-1; start from the display at the endpoint of the 1st row and set it in sequence toward the other end until the ID of the display at the other endpoint of the mth row is set to mj; wherein 1≤m≤k.

[0166] Step 803: According to the IDm-1 of the display, specify the lth display in the mth row to send a return signal; wherein 1≤l≤j.

[0167] In this embodiment, each display in the splicing screen is sorted by rows and columns through preset rules, and a unique ID is set for each display. Through the ID corresponding to each display and the control signal conversion device for the splicing screen, the return signal of any specified display can be called, avoiding the problem of being unable to find the specific faulty display due to environmental interference, and realizing stable control of the splicing screen.

[0168] In this embodiment, in addition to using the computer to set the ID, the ID of each computer can also be set through a traditional remote control or a USB flash drive; wherein a special file is placed in the USB flash drive and then connected to the USB port of each machine, and the machine will automatically update the ID parameters by reading the file in the USB flash drive. In addition, the cable can be a 2.5mm male-to-male cable for easy assembly and construction.

[0169] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control signal conversion device for a splicing screen, characterized in that: include: A first conversion module, a second conversion module, an input interface module, and an output interface module; Wherein, the first input end of the first conversion module is connected to the main chip of the display, the second input end of the first conversion module is connected to the main chip of the next display, and the first control end and the second control end of the first conversion module are respectively connected to the first output end and the second output end of the second conversion module; wherein, the first conversion module is used to receive the first signal of the main chip of the display, and after level conversion of the first signal of the main chip, transmit it to the second conversion module or the output interface module; and is used to receive the second signal from the input interface module and receive the return signal of the next display through the second input end of the first conversion module; The input end of the second conversion module is connected to the control terminal; wherein the input end of the second conversion module receives the control signal of the control terminal; the second conversion module is used to convert the level of the control signal into a level that meets the interface requirements of the first conversion module, and transmit it to the first conversion module; The interface end of the input interface module is connected to the output interface of the previous display or the control terminal, and the signal end of the input interface module is respectively connected to the first receiving end and the first transmitting end of the first conversion module; wherein the input interface module is used to transmit the second signal of the previous display or the second signal of the control terminal to the first conversion module; The interface end of the output interface module is connected to the input interface of the next display, and the signal end of the output interface module is respectively connected to the second receiving end and the second transmitting end of the first conversion module; wherein the output interface module is used to transmit the signal generated by the first conversion module to the next display; According to the control terminal, an ID is set for each display in the spliced ​​screen, and a return signal of the display corresponding to the ID is received according to the ID, specifically: Wherein, the spliced ​​screen includes A display; the spliced ​​screen is A rectangular screen is formed by connecting multiple displays via cables. is the number of displays in each row of the spliced ​​screen, is the number of rows of displays in the spliced ​​screen; and each display includes the control signal conversion device for the spliced ​​screen; , ; Get the number of displays in each row of the spliced ​​screen and the number of rows of the spliced ​​screen ; The first The display at the end point of the row is set as the first display unit, and the ID of the display is set to ; Start from the display at the end of the first row and set it to the other end in sequence until the The ID of the display at the other end of the row is set to ;in, ; According to the display ID , specify the Line The display sends a return signal; among them, .

2. The control signal conversion device for a spliced ​​screen according to claim 1, characterized in that: The first conversion module includes: a first NMOS tube, a second NMOS tube, a first resistor, a second resistor and a first conversion chip; The gate of the first NMOS tube is connected to the first input end of the first conversion module, the source of the first NMOS tube is connected to the circuit ground, and the drain of the first NMOS tube is connected to the gate of the second NMOS tube and the first end of the first resistor; The source of the second NMOS tube is grounded, and the drain of the second NMOS tube is connected to the first end of the second resistor, the first input pin of the first conversion chip, the first output pin of the first conversion chip, and the second input end of the first conversion module; The second end of the first resistor is connected to the second end of the second resistor and a first voltage source; The second input pin, third input pin, fourth input pin, second output pin, third output pin, fourth output pin, power supply pin and ground pin of the first conversion chip are respectively connected to the first control end, first receiving end, second receiving end, second control end, first transmission end, second transmission end of the first conversion module, and the first voltage source and circuit ground.

3. The control signal conversion device for the splicing screen according to claim 2, characterized in that: The first conversion module further includes: a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor; A first end of the fourth resistor is connected to the input end of the first conversion module, and a second end of the fourth resistor is connected to the gate of the first NMOS transistor; A first end of the fifth resistor is connected to the drain of the first NMOS transistor and a first end of the first resistor, and a second end of the fifth resistor is connected to the gate of the second NMOS transistor; The first end of the sixth resistor is connected to the drain of the second NMOS tube, the first end of the second resistor and the first end of the seventh resistor, and the second end of the sixth resistor is connected to the first input pin of the first conversion chip; The second end of the seventh resistor is connected to the first end of the eighth resistor and the first output pin of the first conversion chip; The second end of the eighth resistor is connected to the second input end of the first conversion module; A first end of the ninth resistor is connected to the first control end of the first conversion module, and a second end of the ninth resistor is connected to the second input pin of the first conversion chip; A first end of the tenth resistor is connected to the second output pin of the first conversion chip, and a second end of the tenth resistor is connected to the second control end of the first conversion module.

4. The control signal conversion device for a spliced ​​screen according to claim 2, characterized in that: The first conversion module further includes: a magnetic bead and a first capacitor; The first end of the magnetic bead is connected to the power supply pin of the first conversion chip and the first end of the first capacitor; The second end of the magnetic bead is connected to the first voltage source; The second end of the first capacitor is connected to the ground pin and the circuit ground.

5. The control signal conversion device for a spliced ​​screen according to claim 1, characterized in that: The second conversion module includes: a third NMOS tube, a fourth NMOS tube, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a second conversion chip; The drain of the third NMOS tube is connected to the input end of the second conversion module; The gate of the third NMOS tube is connected to the first end of the eleventh resistor, the first end of the twelfth resistor and the gate of the fourth NMOS tube; The source of the third NMOS tube is connected to the first input pin of the second conversion chip and the second end of the eleventh resistor; The source of the fourth NMOS tube is connected to the first control pin of the second conversion chip and the second end of the twelfth resistor; The drain of the fourth NMOS tube is connected to the first output end of the second conversion module and the first end of the thirteenth resistor; The second end of the thirteenth resistor is connected to the first voltage source; The power supply pin of the second conversion chip is connected to the second voltage source, the output pin of the second conversion chip is connected to the second output end of the second conversion module, and the second control pin of the second conversion chip is electrically connected to the control signal.

6. The control signal conversion device for the splicing screen according to claim 5, characterized in that: The second conversion module further includes: a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a seventeenth resistor; The first end of the fourteenth resistor is connected to the second output end of the second conversion module; The second end of the fourteenth resistor is connected to the output pin of the second conversion chip; The first end of the fifteenth resistor is connected to the second control pin of the second conversion chip and the first end of the sixteenth resistor; The second end of the fifteenth resistor is electrically connected to the control signal; The second end of the sixteenth resistor is connected to the circuit ground; The first end of the seventeenth resistor is connected to the power supply pin of the second conversion chip, the gate of the third NMOS tube, the gate of the fourth NMOS tube, the first end of the eleventh resistor and the first end of the twelfth resistor; The second end of the seventeenth resistor is connected to the second voltage source.

7. The control signal conversion device for a spliced ​​screen according to claim 6, characterized in that: The second conversion module further includes: a second capacitor and a third capacitor; The first end of the second capacitor is connected to the first end of the third capacitor, the first end of the seventeenth resistor, the power supply pin of the second conversion chip, the gate of the third NMOS tube, the gate of the fourth NMOS tube, the first end of the eleventh resistor and the first end of the twelfth resistor; The second end of the second capacitor is connected to the second end of the third capacitor and a circuit ground.

8. The control signal conversion device for a spliced ​​screen according to claim 1, characterized in that: The input interface module includes: a first electrostatic protection device and a second electrostatic protection device; Wherein, the signal end of the input interface module includes: a receiving end and a transmitting end; The receiving end of the input interface module is connected to the first receiving end of the first conversion module, and the transmitting end of the input interface module is connected to the first transmitting end of the first conversion module; The first end of the first electrostatic protection device is connected to the receiving end of the input interface module and the interface end of the input interface module; The first end of the second electrostatic protection device is connected to the transmission end of the input interface module and the interface end of the input interface module.

9. The control signal conversion device for a spliced ​​screen according to claim 1, characterized in that: The output interface module includes: a third electrostatic protection device and a fourth electrostatic protection device; Wherein, the signal end of the output interface module includes: a receiving end and a transmitting end; The receiving end of the output interface module is connected to the second receiving end of the first conversion module, and the transmitting end of the input interface module is connected to the second transmitting end of the first conversion module; The first end of the third electrostatic protection device is connected to the receiving end of the output interface module and the interface end of the output interface module; The first end of the fourth electrostatic protection device is connected to the transmission end of the output interface module and the interface end of the output interface module.

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