CN110930939B - Display screen output port crosstalk prevention method and device - Google Patents
Display screen output port crosstalk prevention method and device Download PDFInfo
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- CN110930939B CN110930939B CN201911403701.9A CN201911403701A CN110930939B CN 110930939 B CN110930939 B CN 110930939B CN 201911403701 A CN201911403701 A CN 201911403701A CN 110930939 B CN110930939 B CN 110930939B
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention discloses a crosstalk prevention method for an output port of a display screen, which comprises the following steps: according to the sampling data, calculating the opening width of the output current of each port in one display sub-period; determining a port opening time point and a port closing time point of each port in a display sub-period according to the opening time set value and the opening width of the output current; then, according to the port opening time point and the port closing time point, opening and closing of the corresponding ports are controlled, so that different OUT ports start to output current at different positions in a display period, but the display time width is not influenced; and further, the condition that different ports are opened simultaneously can be avoided, so that signal crosstalk on the display screen is reduced, and EMI is improved.
Description
Technical Field
The invention relates to the technical field of display screens, in particular to a method and a device for preventing crosstalk of an output port of a display screen by starting output current at any position in a display period.
Background
As a rapidly developing new industry, the LED industry has been widely applied to the fields of advertising, stage background, traffic guidance, etc., as an important way of information dissemination. As the social demand for LED displays increases, LED display technologies are also continuously being innovated. When different OUT ports of the traditional display screen are simultaneously opened, the different OUT ports can be mutually interfered, and therefore the display effect is influenced. Therefore, a method is needed to solve the signal crosstalk between the OUT ports, thereby reducing the signal crosstalk on the display screen and improving EMI.
Disclosure of Invention
The invention mainly aims to provide a method and a device for preventing crosstalk of an output port of a display screen by starting output current at any position in a display period.
In order to achieve the above object, the present invention provides a method for preventing crosstalk at an output port of a display screen, the method comprising the following steps:
calculating the opening width value of the output current of each port in one display sub-period according to the sampling data;
determining a port opening time point and a port closing time point of each port in a display sub-period according to the opening time set value and the opening width value of the output current; and
and controlling the opening and closing of the corresponding port according to the port opening time point and the port closing time point.
In the method provided by the invention, the starting time setting value X is less than or equal to the effective number of the global clocks in the display sub-period.
In the method provided by the present invention, if the opening time setting value X is greater than or equal to the opening width value N, the port opening time point is the (N-X) th global clock, and the port closing time point is the xth global clock;
and if the opening time setting value X is smaller than the opening width value N, the opening time point of the port is the 0 th global clock, and the closing time point of the port is the Nth global clock.
According to another aspect of the present invention, there is also provided a display screen output port crosstalk prevention apparatus, including:
the opening width value calculation module is used for calculating the opening width value of the output current of each port in one display sub-period according to the sampling data;
the opening and closing time point calculating module is used for determining a port opening time point and a port closing time point of each port in a display sub-period according to the opening time setting value of the output current and the opening width value; and
and the port control module is used for controlling the opening and closing of the corresponding port according to the port opening time point and the port closing time point.
In the device provided by the invention, the starting time setting value X is less than or equal to the effective number of the global clocks in the display sub-period.
In the device provided by the present invention, the opening/closing time point calculation module includes a comparison unit and a processing unit, the comparison unit is configured to compare the opening time setting value X and the opening width value N, output a first comparison result to the processing unit when the opening time setting value X is greater than or equal to the opening width value N, and output a second comparison result to the processing unit when the opening time setting value X is less than the opening width value N;
the processing unit is configured to set the port opening time point to be an (N-X) th global clock according to the first comparison result, set the port closing time point to be an xth global clock, and further configured to set the port opening time point to be a 0 th global clock according to the second comparison result, and set the port closing time point to be an nth global clock.
According to another aspect of the present invention, there is also provided a display screen output port crosstalk prevention apparatus, including a processor and a memory, where the memory stores a computer program, and the computer program, when executed by the processor, implements the steps of the method as described above.
According to another aspect of the present invention, there is also provided a computer readable storage medium, storing a computer program which, when executed by a processor, implements the steps of the method as described above.
The crosstalk prevention method, the device and the computer readable storage medium for the output port of the display screen have the following beneficial effects: according to the crosstalk prevention method for the output port of the display screen, the port opening time point and the port closing time point of each port in one display sub-period are determined according to the opening time set value and the opening width value of the output current; then, according to the port opening time point and the port closing time point, opening and closing of the corresponding ports are controlled, so that different OUT ports start to output current at different positions in a display period, but the display time width is not influenced; and further, the condition that different ports are opened simultaneously can be avoided, so that signal crosstalk on the display screen is reduced, and EMI is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
fig. 1 is a schematic flowchart of a method for preventing crosstalk at an output port of a display screen according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing a complete frame at 16 times;
FIG. 3 is a diagram illustrating port opening time points and port closing time points when the opening width value is less than or equal to the opening time setting value;
fig. 4 is a schematic diagram illustrating a port opening time point and a port closing time point when the opening width value is greater than the opening time setting value.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
Example one
Fig. 1 is a flowchart of a crosstalk prevention method for an output port of a display screen according to an embodiment of the present invention. As shown in fig. 1, the crosstalk prevention method for the output port of the display screen provided by the present invention includes the following steps:
step S1, calculating the opening width value of the output current of each port in a display sub-period according to the sampling data;
specifically, in an embodiment of the present invention, the 16-bit gray-level value may represent any one of data in the range of 0 to 65536(2^16 ^ 65536); in display applications, a level is typically represented by the width of a clock signal global clock (gclk), and then between two "frame-change enables", 65535(2^16 ^ 65536) global clocks are needed to be able to display all the data completely. This is the case for 1 sweep. Assuming that the number of scan lines is N, then between two "frame change enables", there need to be [ 65535 × N ] global clocks to be able to display all the data completely. Therefore, according to different frequency multiplication numbers, the time for displaying a frame is divided into different display sub-periods, each of which includes a certain number of global clocks, and table 1 shows the number of global clocks in each display sub-period, the number of cycles of each scan, and the number of cycles required for displaying a frame of data (displaying data of all scan lines) at different frequency multiplication levels. FIG. 2 is a diagram of a full frame at 16 times, which shows a scan period of 64-scan of 16-bit gray data. The shaded portion in the figure represents a line scan small period, which includes 67 global clocks, and a line feed time is between two scan lines.
TABLE 1
Step S2, determining the port opening time point and the port closing time point of each port in a display sub-period according to the opening time setting value and the opening width value of the output current;
specifically, in an embodiment of the present invention, a user may set display positions of output currents for different output ports as needed, that is, determine a set value of an on-time of the output current for each port, so that the on-positions of the plurality of ports are staggered, thereby avoiding a situation that different ports are simultaneously on, and reducing signal crosstalk on the display screen and improving EMI.
Specifically, in an embodiment of the present invention, the on-time setting value X is less than or equal to the effective number of global clocks in the display sub-period, so that the current can be effectively output.
Further, according to the set opening time and opening width value, the opening time point and the closing time point in the current display sub-period are determined. Specifically, as shown in fig. 3, if the opening time setting value X is greater than or equal to the opening width value N, the port opening time point is the (N-X) th global clock, and the port closing time point is the xth global clock; as shown in fig. 4, if the opening time setting value X is smaller than the opening width value N, the port opening time point is the 0 th global clock, and the port closing time point is the nth global clock.
And step S3, controlling the opening and closing of the corresponding port according to the port opening time point and the port closing time point.
Specifically, in an embodiment of the present invention, a counter is provided inside the port, and is used for counting the number of global clocks of the clock signal, and when the current count value of the port is within the range of the port opening time point and the port closing time point, the port is opened; otherwise, the port is closed.
According to the crosstalk prevention method for the output port of the display screen, the port opening time point and the port closing time point of each port in one display sub-period are determined according to the opening time set value and the opening width value of the output current; then, according to the port opening time point and the port closing time point, opening and closing of the corresponding ports are controlled, so that different OUT ports start to output current at different positions in a display period, but the display time width is not influenced; and further, the condition that different ports are opened simultaneously can be avoided, so that signal crosstalk on the display screen is reduced, and EMI is improved.
Example two
Based on the same inventive concept, the embodiment discloses a crosstalk prevention device for an output port of a display screen, which comprises:
the opening width value calculation module is used for calculating the opening width value of the output current of each port in one display sub-period according to the sampling data;
the opening and closing time point calculating module is used for determining a port opening time point and a port closing time point of each port in a display sub-period according to the opening time setting value of the output current and the opening width value; and
and the port control module is used for controlling the opening and closing of the corresponding port according to the port opening time point and the port closing time point.
In the device provided by the invention, the starting time setting value X is less than or equal to the effective number of the global clocks in the display sub-period.
In the device provided by the present invention, the opening/closing time point calculation module includes a comparison unit and a processing unit, the comparison unit is configured to compare the opening time setting value X and the opening width value N, output a first comparison result to the processing unit when the opening time setting value X is greater than or equal to the opening width value N, and output a second comparison result to the processing unit when the opening time setting value X is less than the opening width value N;
the processing unit is configured to set the port opening time point to be an (N-X) th global clock according to the first comparison result, set the port closing time point to be an xth global clock, and further configured to set the port opening time point to be a 0 th global clock according to the second comparison result, and set the port closing time point to be an nth global clock.
The functions of the functional modules of the apparatus according to the embodiment of the present invention may be specifically implemented according to the method in the foregoing method embodiment, and the specific implementation process may refer to the description related to the foregoing method embodiment, which is not described herein again.
EXAMPLE III
Based on the same inventive concept, the embodiment discloses a crosstalk prevention device for an output port of a display screen, which comprises a processor and a memory, wherein the memory stores a computer program, and the computer program realizes the steps of the method according to the first embodiment when being executed by the processor.
Example four
Based on the same inventive concept, the present embodiment discloses a computer-readable storage medium, storing a computer program, which, when executed by a processor, performs the steps of the method according to the first embodiment.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components in accordance with embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (4)
1. An LED display screen output port crosstalk prevention method is characterized by comprising the following steps:
calculating the opening width value of the output current of each port in one display sub-period according to the sampling data;
determining a port opening time point and a port closing time point of each port in a display sub-period according to the opening time set value and the opening width value of the output current; and
controlling the opening and closing of the corresponding port according to the port opening time point and the port closing time point;
the starting time setting value X is less than or equal to the effective number of the global clocks in the display sub-period;
if the opening time setting value X is larger than or equal to the opening width value N, the port opening time point is the (N-X) th global clock, and the port closing time point is the Xth global clock;
and if the opening time setting value X is smaller than the opening width value N, the opening time point of the port is the 0 th global clock, and the closing time point of the port is the Nth global clock.
2. An LED display screen output port crosstalk prevention device, the device comprising:
the opening width value calculation module is used for calculating the opening width value of the output current of each port in one display sub-period according to the sampling data;
the opening and closing time point calculating module is used for determining a port opening time point and a port closing time point of each port in a display sub-period according to the opening time setting value of the output current and the opening width value; and
the port control module is used for controlling the opening and closing of the corresponding port according to the port opening time point and the port closing time point;
the starting time setting value X is less than or equal to the effective number of the global clocks in the display sub-period;
the opening and closing time point calculating module comprises a comparing unit and a processing unit, wherein the comparing unit is used for comparing the opening time setting value X with the opening width value N, outputting a first comparison result to the processing unit when the opening time setting value X is larger than or equal to the opening width value N, and outputting a second comparison result to the processing unit when the opening time setting value X is smaller than the opening width value N;
the processing unit is configured to set the port opening time point to be an (N-X) th global clock according to the first comparison result, set the port closing time point to be an xth global clock, and further configured to set the port opening time point to be a 0 th global clock according to the second comparison result, and set the port closing time point to be an nth global clock.
3. An LED display screen output port crosstalk prevention apparatus, comprising a processor and a memory, wherein the memory stores a computer program, and the computer program, when executed by the processor, implements the steps of the method of claim 1.
4. A computer-readable storage medium, characterized in that a computer program is stored which, when being executed by a processor, carries out the steps of the method as claimed in claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911403701.9A CN110930939B (en) | 2019-12-27 | 2019-12-27 | Display screen output port crosstalk prevention method and device |
| PCT/CN2020/135664 WO2021129412A1 (en) | 2019-12-27 | 2020-12-11 | Display screen output port anti-crosstalk method and apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911403701.9A CN110930939B (en) | 2019-12-27 | 2019-12-27 | Display screen output port crosstalk prevention method and device |
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| CN110930939B true CN110930939B (en) | 2021-04-02 |
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| CN110930939B (en) * | 2019-12-27 | 2021-04-02 | 深圳市明微电子股份有限公司 | Display screen output port crosstalk prevention method and device |
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| WO2021129412A1 (en) | 2021-07-01 |
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