CN111830857A - Display screen and control method thereof - Google Patents
Display screen and control method thereof Download PDFInfo
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- CN111830857A CN111830857A CN201910327751.7A CN201910327751A CN111830857A CN 111830857 A CN111830857 A CN 111830857A CN 201910327751 A CN201910327751 A CN 201910327751A CN 111830857 A CN111830857 A CN 111830857A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21119—Circuit for signal adaption, voltage level shift, filter noise
Abstract
The application provides a display screen, includes: n +1 spliced screens which are sequentially connected in series, wherein each spliced screen comprises a processor and a first level conversion module; the front N spliced screens also comprise second level conversion modules; the first level conversion module of the first spliced screen is used for receiving a control instruction; the first level conversion module of each spliced screen is used for performing level conversion on the received control instruction and outputting the control instruction to the processor and the second level conversion module of the screen; the processor of each spliced screen is used for processing the control instruction; and the second level conversion module of each spliced screen is used for performing level conversion on the received control command and outputting the control command to the first level conversion module of the next spliced screen. Because the instruction is transmitted to the processor through the first level conversion module of the spliced screen and is also transmitted to the next spliced screen through the second level conversion module, the transmission of the instruction between the spliced screens does not need to be forwarded by the processor, the whole transmission process is realized by circuit logic with small time delay, and the aim of synchronous control can be achieved.
Description
Technical Field
The application relates to the technical field of screen splicing, in particular to a display screen and a control method of the display screen.
Background
In the field of liquid crystal display, a plurality of tiled screens are commonly connected in series to form a display screen so as to display a signal image. Each spliced screen comprises two serial interfaces (one is an uplink serial port, the other is a downlink serial port) and a processor, the serial connection mode is that the downlink serial port of the previous spliced screen is connected with the uplink serial port of the next spliced screen, the uplink serial port of the first spliced screen is connected with the control end, and the downlink serial port of the last spliced screen is also connected with the control end.
In the related art, when the control end controls all the spliced screens, the control instruction can only be transmitted to the processor of the first spliced screen through the uplink serial port of the first spliced screen, the processor analyzes the control instruction, and simultaneously transmits the control instruction to the second spliced screen through the downlink serial port of the first spliced screen, and the process is repeated until the control instruction is transmitted to the last spliced screen, so that the control over all the spliced screens is realized. Because the control instruction sent by the control end needs to pass through the processor of each spliced screen, and the application program of the processor forwards the control instruction downwards, the control has time delay, and the purpose of controlling all the spliced screens at the same time cannot be realized.
Disclosure of Invention
In view of this, the present application provides a display screen and a control method for a display screen, so as to solve the problem that the related art cannot simultaneously control all tiled screens.
According to a first aspect of the embodiments of the present application, a display screen is provided, where the display screen is formed by sequentially connecting N +1 spliced screens in series, N is greater than or equal to 1, each spliced screen at least includes a processor, the (N + 1) th spliced screen in the display screen includes a first level shift module, the first N spliced screens in the display screen respectively include a first level shift module and a second level shift module, and the first level shift module of each spliced screen in the first N spliced screens is respectively connected to the processor and the second level shift module;
the first level conversion module of the first spliced screen in the first N spliced screens is connected with external control equipment and used for receiving a control instruction from the control equipment;
the first level conversion module of each of the first N spliced screens is used for performing level conversion on the received control instruction and outputting the control instruction to the processor and the second level conversion module of the screen;
the processor of each spliced screen in the first N spliced screens is used for processing the received control instruction;
the second level conversion module of each spliced screen in the first N spliced screens is connected with the first level conversion module of the next spliced screen;
and the second level conversion module of each spliced screen in the first N spliced screens is used for performing level conversion on the received control command and outputting the control command to the first level conversion module of the next spliced screen connected with the second level conversion module.
Optionally, the control instruction is used for indicating to modify the state of the spliced screen; the processor is specifically configured to analyze the received control instruction, acquire a state modification parameter carried by the control instruction, and modify the state of the spliced screen according to the acquired state modification parameter.
Optionally, the control instruction is used for indicating to acquire state information of the spliced screen; the processor is specifically configured to analyze the received control instruction and acquire an address code carried by the control instruction; judging whether the acquired address code is consistent with the address code of the spliced screen; if the information is consistent with the information, returning the state information of the spliced screen to the control equipment; and if the control instructions are not consistent, discarding the control instructions.
Optionally, the first N spliced screens further include and gates respectively; the AND gate in each spliced screen is arranged in a spliced screen state information return channel between the processor of the screen and the external control equipment, two input ends of the AND gate are respectively connected with the processor of the screen and the second level conversion module, and an output end of the AND gate is connected with the first level conversion module of the screen; the processor is also used for transmitting the state information of the spliced screen to an AND gate of the spliced screen; and the AND gate is used for returning the received state information to the control equipment.
According to a second aspect of embodiments of the present application, there is provided a control method for a display screen, the method being applied to the display screen of the first aspect, the method including:
a first level conversion module of a first spliced screen in the display screens receives a control instruction from external control equipment;
the first level conversion module of each of the first N spliced screens in the display screen performs level conversion on the received control instruction and outputs the control instruction to the processor and the second level conversion module of the display screen;
the processor of each spliced screen in the first N spliced screens processes the received control instruction;
and the second level conversion module of each spliced screen in the first N spliced screens performs level conversion on the received control command and outputs the control command to the first level conversion module of the next spliced screen connected with the second level conversion module.
Optionally, the control instruction is used for indicating to modify the state of the spliced screen; the processor processes the received control instruction and can comprise: analyzing the received control instruction to obtain a state modification parameter carried by the control instruction; and modifying the state of the spliced screen according to the acquired state modification parameters.
Optionally, the control instruction is used for indicating to acquire state information of the spliced screen; the processor processes the received control instruction and can comprise: analyzing the received control instruction and acquiring an address code carried by the control instruction; judging whether the acquired address code is consistent with the address code of the spliced screen; if the information is consistent with the information, returning the state information of the spliced screen to the external control equipment; and if the control instructions are not consistent, discarding the control instructions.
Optionally, the returning, by the processor, the state information of the spliced screen to the external control device may include: the processor transmits the state information of the spliced screen to an AND gate of the spliced screen; and the AND gate returns the received state information to the external control equipment.
By applying the embodiment of the application, when the control instruction sent by the control device is transmitted to the processor through the first level conversion module of the spliced screen, the control instruction can also be transmitted to the next spliced screen through the second level conversion module, so that the transmission of the control instruction between the spliced screens is not required to be forwarded by an application program of the processor, the whole transmission process can be realized by hardware circuit logic, the time delay of the whole transmission process is very small, each spliced screen can be reached simultaneously, and the purpose of simultaneously controlling the spliced screens in the display screen can be realized.
Drawings
FIG. 1 is a diagram illustrating a prior art display screen architecture according to an exemplary embodiment;
FIG. 2 is a diagram of a display screen configuration shown in accordance with an exemplary embodiment of the present application;
FIG. 3A is another display screen structure diagram shown in accordance with an exemplary embodiment of the present application;
FIG. 3B is a block diagram of a tiled display according to the embodiment of FIG. 3A;
FIG. 4A is a flowchart illustrating an embodiment of a display screen control method according to an exemplary embodiment of the present application;
FIG. 4B is a flow chart illustrating the transmission of instructions according to the embodiment shown in FIG. 4A;
fig. 4C is a flow chart illustrating information return according to the embodiment shown in fig. 4A.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
Fig. 1 is a display screen structure diagram in the related art shown according to an exemplary embodiment of the present application, and is a display screen composed of 6 tiled screens, where a control end transmits a control instruction to a processor of the screen No. 1 through an uplink serial port of the screen No. 1, the processor analyzes the control instruction, and transmits the control instruction to a processor of the screen No. 2 through a downlink serial port of the screen No. 1, and so on until the control instruction is transmitted to the screen No. 6. Because the control instruction sent by the control end needs to pass through the processor of each spliced screen, and the application program of the processor forwards the control instruction downwards, the control has time delay, and the purpose of controlling all the spliced screens at the same time cannot be realized.
In order to solve the above problems, the present application provides a display screen, as shown in fig. 2, the display screen is formed by sequentially connecting N +1 tiled screens in series, where N is a positive integer greater than or equal to 1, and the (N + 1) th tiled screen in the display screen includes a first level conversion module and a processor; the first N spliced screens respectively comprise a first level conversion module, a second level conversion module and a processor, and the first level conversion module of each spliced screen in the first N spliced screens is respectively connected with the processor and the second level conversion module;
the sequential concatenation mode is: the first level conversion module of the first spliced screen in the first N spliced screens is connected with external control equipment, and the second level conversion module of each spliced screen is connected with the first level conversion module of the next spliced screen.
The transmission flow of the control instruction sent by the control equipment is as follows:
the first level conversion module of the first spliced screen in the first N spliced screens is used for receiving a control instruction from the control equipment;
the first level conversion module of each of the first N spliced screens is used for performing level conversion on the received control instruction and outputting the control instruction to the processor and the second level conversion module of the screen;
the processor of each spliced screen in the first N spliced screens is used for processing the received control instruction;
and the second level conversion module of each spliced screen in the first N spliced screens is used for performing level conversion on the received control command and outputting the control command to the first level conversion module of the next spliced screen connected with the second level conversion module.
The level conversion function of the first level conversion module and the second level conversion module is used for converting an externally input signal into a TTL level signal which can be processed by a processor in the spliced screen. The first level shift module and the second level shift module may be implemented by a level shift chip and a peripheral circuit, which include two sets of transceiving channels (i.e., one set is RX1 and TX1, and the other set is RX2 and TX2), one set is used to implement the first level shift module, and the other set is used to implement the second level shift module, such as a MAX232 level shift chip.
Based on the description of the embodiment, it can be known that the control instruction sent by the control device is transmitted to the processor through the first level conversion module of the spliced screen and also transmitted to the next spliced screen through the second level conversion module, so that the transmission of the control instruction between the spliced screens is not required to be forwarded by the application program of the processor, the whole transmission process can be realized by hardware circuit logic, therefore, the time delay of the whole transmission process is very small, and each spliced screen can be reached at the same time, thereby the purpose of controlling the spliced screens in the display screen at the same time can be realized.
In one embodiment, the control instruction received by the processor in the tiled screen may include the following two forms:
the first form is that the control instruction is used for indicating the state of the modified splicing screen (carrying the modification parameter, not carrying the address code):
the process of the processor for processing the control instruction is as follows: and analyzing the control command to obtain a modification parameter carried by the control command, and updating the state of the spliced screen according to the modification parameter.
It should be noted that, since the control instruction does not carry an address code, each of the tiled screens needs to modify the state, so that the control device can simultaneously control all the tiled screens.
The second form is that the control instruction is used for indicating to acquire the status information (carrying address codes) of the spliced screen:
the process of the processor for processing the control instruction is as follows: analyzing the control instruction to obtain an address code carried by the control instruction, judging whether the obtained address code is consistent with the address code of the spliced screen, and if so, returning the state information of the spliced screen to the control equipment; if not, the control instruction is discarded.
It is worth noting that since the control instruction carries the address code of the spliced screen, only the spliced screen of the address code needs to return the state information, and other spliced screens do not respond, so that the control device acquires the state information of one spliced screen each time.
Based on the above description, besides the need to control the states of all the tiled screens, each tiled screen is also required to feed back its own state information, and since each tiled screen is serially connected and only one tiled screen can feed back the state information at the same time, each tiled screen needs to realize the feedback of the state information by a time-division multiplexing return channel, so that the control instruction needs to carry the address code of one tiled screen at each time.
In an embodiment, for the status information feedback process of the tiled screens, referring to fig. 3A, the first N tiled screens may further include and gates, the and gate in each tiled screen is disposed in the tiled screen status information return channel between the processor of the screen and the external control device, two input ends of the and gate are connected to the processor of the screen and the second level conversion module, and an output end of the and gate is connected to the first level conversion module of the screen;
the processor is used for transmitting the state information of the spliced screen to an AND gate of the spliced screen;
and the AND gate is used for returning the received state information to the control equipment.
It should be noted that, the state information received by the and gate is from one of the two input ends, that is, the state information sent by the second level shift module or the state information sent by the processor of the local screen, and since the control instruction sent by the control device each time is only used for obtaining the state information of one spliced screen, when the state information received by the and gate is from the processor of the local screen, no signal is input into the and gate by the second level shift module (the idle state is high level), and thus the state information obtained after the and gate performs and operation on the signals of the two input ends is still the state information, so that the state information from the processor of the local screen can be transmitted to the previous spliced screen or the control device by the first level shift module; when the state information received by the AND gate is from the second level conversion module of the screen, no signal is input into the AND gate by the processor (the idle state is high level), so that the AND gate still obtains the state information after performing AND operation on the signals of the two input ends, and the state information from the second level conversion module of the screen can be transmitted to the upper splicing screen or the control equipment by the first level conversion module.
In an exemplary scenario, assuming that the first level shift module and the second level shift module are implemented by a MAX232 level shift chip, as shown in fig. 3B, pins R1in, R1out, T1out, and T1in in the MAX232 implement the function of the first level shift module, pins R2in, R2out, T2out, and T2in implement the function of the first level shift module, and a control instruction sent by the control device is transmitted to the processor through the pins T1out and T1in in each of the tiles, and at the same time, the control instruction is also transmitted to the next tile through the pins T2in and T2 out; and the state information sent by the processor in the spliced screen or the state information transmitted by the next spliced screen through the R2in and R2out pins is transmitted to the control equipment through the R1in and R1out pins after passing through the AND gate.
Based on the description of the embodiment, the and gate is added in the return channel to realize time-sharing multiplexing of the return channel of each spliced screen, that is, at the same time, the and gate only transmits the state information of one spliced screen, so that the state information feedback of each spliced screen can be realized through the and gate, and the whole feedback process is realized by hardware circuit logic, and the feedback delay is very small.
Fig. 4A is a flowchart illustrating an embodiment of a display screen control method according to an exemplary embodiment of the present application, where the display screen control method may be applied to the display screens illustrated in fig. 2 and fig. 3A, as shown in fig. 4A, and the display screen control method includes the following steps:
step 401: and a first level conversion module of a first spliced screen in the display screens receives a control instruction from external control equipment.
Step 402: and the first level conversion module of each of the first N spliced screens in the display screen performs level conversion on the received control instruction and outputs the control instruction to the processor and the second level conversion module of the display screen.
Step 403: and the processor of each spliced screen in the first N spliced screens processes the received control instruction.
Step 404: and the second level conversion module of each spliced screen in the first N spliced screens performs level conversion on the received control command and outputs the control command to the first level conversion module of the connected next spliced screen.
For example, the display screen includes two spliced screens, as shown in fig. 4B, when the first level conversion module of No. 1 screen receives a control instruction sent by an external control device, the control instruction is transmitted to the processor of the screen after being subjected to level conversion and is simultaneously transmitted to the second level conversion module of the screen, the second level conversion module is transmitted to the first level conversion module of No. 2 screen after being subjected to level conversion, and the first level conversion module of No. 2 screen is transmitted to the processor of the screen after being subjected to level conversion, so that synchronous transmission of the control instruction is realized.
In an embodiment, the control instruction sent by the control device may be used to instruct to modify the state of the tiled screen, and the received control instruction is analyzed in a process of processing the received control instruction by the processor, so as to obtain a state modification parameter carried by the control instruction, and modify the state of the tiled screen according to the obtained state modification parameter.
In another embodiment, the control instruction sent by the control device may also be used to instruct to acquire state information of the tiled screen, analyze the received control instruction in terms of the process of processing the received control instruction by the processor, acquire an address code carried by the control instruction, determine whether the acquired address code is consistent with the address code of the tiled screen, and if so, return the state information of the tiled screen to the external control device; and if the control instructions are not consistent, discarding the control instructions.
In an embodiment, for the process that the processor returns the state information of the spliced screen to the external control device, the processor may transmit the state information of the spliced screen to an and gate of the spliced screen, and the and gate returns the received state information to the external control device.
Taking the display screen including two spliced screens as an example, as shown in fig. 4C, it is assumed that the control instruction sent by the control device is used to obtain the state information of screen 2, therefore, when the control instruction is transmitted to screen 2, screen 2 sends the state information to the first level conversion module of the screen, the first level conversion module of the screen carries out level conversion and then transmits to the second level conversion module of screen 1, the second level conversion module of screen 1 carries out level conversion and then transmits to the and gate of the screen, because no information is returned to the and gate of the screen at this time by screen 1, the state information of screen 2 can be transmitted to the first level conversion module of screen 1 through the and gate, the first level conversion module of screen 1 carries out level conversion and then transmits to the control device, thereby realizing the return of the state information of the spliced screen.
For the detailed process from step 401 to step 404, reference may be made to the related description of the embodiments shown in fig. 2 and fig. 3A, and details are not repeated here.
In the embodiment of the application, a control instruction sent by the control device can be transmitted to the next spliced screen through the second level conversion module while being transmitted to the processor through the first level conversion module of the spliced screen, so that the transmission of the control instruction between the spliced screens is not required to be forwarded through an application program of the processor, the whole transmission process can be realized through hardware circuit logic, the time delay of the whole transmission process is very small, each spliced screen can be reached simultaneously, and the purpose of simultaneously controlling the spliced screens in the display screen can be realized.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (8)
1. A display screen is formed by sequentially connecting N +1 spliced screens in series, wherein N is a positive integer larger than or equal to 1, each spliced screen at least comprises a processor, and the (N + 1) th spliced screen in the display screen comprises a first level conversion module;
the first level conversion module of the first spliced screen in the first N spliced screens is connected with external control equipment and used for receiving a control instruction from the control equipment;
the first level conversion module of each of the first N spliced screens is used for performing level conversion on the received control instruction and outputting the control instruction to the processor and the second level conversion module of the screen;
the processor of each spliced screen in the first N spliced screens is used for processing the received control instruction;
the second level conversion module of each spliced screen in the first N spliced screens is connected with the first level conversion module of the next spliced screen;
and the second level conversion module of each spliced screen in the first N spliced screens is used for performing level conversion on the received control command and outputting the control command to the first level conversion module of the next spliced screen connected with the second level conversion module.
2. The display screen of claim 1, wherein the control instructions are configured to instruct to modify a state of the tiled screen;
the processor is specifically configured to analyze the received control instruction, acquire a state modification parameter carried by the control instruction, and modify the state of the spliced screen according to the acquired state modification parameter.
3. The display screen of claim 1, wherein the control instruction is used for instructing to acquire status information of the spliced screen;
the processor is specifically configured to analyze the received control instruction and acquire an address code carried by the control instruction; judging whether the acquired address code is consistent with the address code of the spliced screen; if the information is consistent with the information, returning the state information of the spliced screen to the control equipment; and if the control instructions are not consistent, discarding the control instructions.
4. The display screen of claim 3, wherein the first N tiled screens further comprise an AND gate, respectively; the AND gate in each spliced screen is arranged in a spliced screen state information return channel between the processor of the screen and the external control equipment, two input ends of the AND gate are respectively connected with the processor of the screen and the second level conversion module, and an output end of the AND gate is connected with the first level conversion module of the screen;
the processor is also used for transmitting the state information of the spliced screen to an AND gate of the spliced screen;
and the AND gate is used for returning the received state information to the control equipment.
5. A method for controlling a display screen, the method being applied to the display screen of any one of claims 1 to 4, the method comprising:
a first level conversion module of a first spliced screen in the display screens receives a control instruction from external control equipment;
the first level conversion module of each of the first N spliced screens in the display screen performs level conversion on the received control instruction and outputs the control instruction to the processor and the second level conversion module of the display screen;
the processor of each spliced screen in the first N spliced screens processes the received control instruction;
and the second level conversion module of each spliced screen in the first N spliced screens performs level conversion on the received control command and outputs the control command to the first level conversion module of the next spliced screen connected with the second level conversion module.
6. The method of claim 5, wherein the control instruction is used to instruct to modify the state of the tiled screen;
the processor processes the received control instructions, including:
analyzing the received control instruction to obtain a state modification parameter carried by the control instruction;
and modifying the state of the spliced screen according to the acquired state modification parameters.
7. The method of claim 5, wherein the control instruction is used for instructing to acquire status information of the spliced screen;
the processor processes the received control instructions, including:
analyzing the received control instruction and acquiring an address code carried by the control instruction;
judging whether the acquired address code is consistent with the address code of the spliced screen;
if the information is consistent with the information, returning the state information of the spliced screen to the external control equipment;
and if the control instructions are not consistent, discarding the control instructions.
8. The method of claim 7, wherein the processor returns status information of the tiled screen to the external control device, comprising:
the processor transmits the state information of the spliced screen to an AND gate of the spliced screen;
and the AND gate returns the received state information to the external control equipment.
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