CN113903297A - Display control method and system of LED display screen - Google Patents
Display control method and system of LED display screen Download PDFInfo
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- CN113903297A CN113903297A CN202111479109.4A CN202111479109A CN113903297A CN 113903297 A CN113903297 A CN 113903297A CN 202111479109 A CN202111479109 A CN 202111479109A CN 113903297 A CN113903297 A CN 113903297A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
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Abstract
The invention discloses a display control method and a system of an LED display screen, wherein the method comprises the following steps: receiving video signal data sent by an upper computer, and converting the video signal data into video stream data; acquiring a horizontal synchronizing signal and a field synchronizing signal of video stream data, and coding the video stream data based on the horizontal synchronizing signal and the field synchronizing signal to acquire coded video stream data; the built-in scanning playing control module decodes the coded video stream data and caches the decoded video stream data in a corresponding cache region; the scanning playing control module scans according to the sequence of the decoded video stream data cached in the decoding playing control module to form a screen display control signal; and outputting the screen display control signal to the LED display screen, and controlling the LED display screen to display and play based on the screen display control signal. In the embodiment of the invention, the display control of the LED display screen is realized, and the display content of the LED display screen can be more exquisite.
Description
Technical Field
The invention relates to the technical field of LED display control, in particular to a display control method and a display control system of an LED display screen.
Background
The LED display screen is an electronic display screen formed by LED lattices, the display content forms of the screen, such as characters, animations, pictures and videos, are changed in time by the red and green lamp beads which are turned on and off, and the display control of the components is carried out through a modular structure. Mainly comprises a display module, a control system and a power supply system. The display module is a screen consisting of LED lamp dot arrays and emits light; the control system realizes the conversion of the content displayed on the screen under the on-off condition in the regulation area; the power supply system converts the input voltage and current to meet the requirement of a display screen; however, in the existing display control of the LED display screen, the control of the fineness of the displayed color and the displayed content of the LED display screen is still deficient, and the content displayed by the corresponding LED display screen cannot be made finer and more fidelity under the control of low cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a display control method and a display control system of an LED display screen, which are used for realizing the display control of the LED display screen and enabling the display content of the LED display screen to be finer and smoother.
In order to solve the technical problem, an embodiment of the present invention provides a display control method for an LED display screen, including an upper computer, a display control system and an LED display screen, wherein an input end of the display control system is connected to the upper computer, and an output end of the display control system is connected to the LED display screen; the method comprises the following steps:
the display control system receives video signal data sent by the upper computer and converts the video signal data into video stream data;
acquiring a horizontal synchronizing signal and a field synchronizing signal of the video stream data, and encoding the video stream data based on the horizontal synchronizing signal and the field synchronizing signal to acquire encoded video stream data;
a scanning playing control module arranged in the display control system decodes the coded video stream data and caches the decoded video stream data in a corresponding cache region;
the scanning playing control module scans according to the sequence of the decoded video stream data cached in the decoding playing control module to form a screen display control signal;
and outputting the screen display control signal to the LED display screen, and controlling the LED display screen to display and play based on the screen display control signal.
Optionally, after converting the video signal data into video stream data, the method further includes:
scaling the video stream data according to the size of an LED display screen to obtain the scaled video stream data;
RGB gray data of each pixel in the video stream data after scaling is extracted, and gray adjustment processing of an LED display screen is carried out on the basis of the RGB gray data of each pixel to form a brightness adjustment signal.
Optionally, the scaling the video stream data according to the size of the LED display screen to obtain the scaled video stream data includes:
and carrying out scaling processing on the video stream data according to the size of the LED display screen by using a bicubic interpolation scaling algorithm to obtain the scaled video stream data.
Optionally, the scaling the video stream data according to the size of the LED display screen by using a bicubic interpolation scaling algorithm to obtain scaled video stream data includes:
obtaining a first resolution size of a video frame in the video stream data and a second resolution size of the LED display screen;
calculating a scaling ratio based on the first resolution size and the second resolution size;
carrying out scaling mapping processing on the corresponding video frames in the video stream data based on the scaling proportion, and scaling the mapping result;
selecting 16 pixels which are nearest to the target pixel in the scaling mapping result to calculate the weight of the target pixel, and obtaining the weight of the target pixel;
calculating influence factors between target pixel points in the scaling mapping result and the weights of the corresponding target pixel points based on a bicubic interpolation function to obtain the influence factors of the target pixel points;
and substituting the influence factors of the target pixel points into a pixel gray level calculation function to calculate the pixel values of the target pixel points, and obtaining the video stream data after scaling based on the pixel values of the target pixel points.
Optionally, the performing gray scale adjustment processing on the LED display screen based on the RGB gray scale data of each pixel to form a brightness adjustment signal includes:
adjusting the forward current processing flowing through the LED display screen based on the RGB gray scale data of each pixel to form a brightness adjusting signal; or the like, or, alternatively,
and carrying out gray scale adjustment processing on the LED display screen by utilizing a pulse width adjustment mode based on the RGB gray scale data of each pixel to form a brightness adjustment signal.
Optionally, the processing of adjusting the gray scale of the LED display screen based on the RGB gray scale data of each pixel by using a pulse width adjustment method to form a brightness adjustment signal includes:
and carrying out gray scale adjustment processing on the LED display screen by utilizing the proportional relation between the pulse width and the adjustment period based on the RGB gray scale data of each pixel to form a brightness adjustment signal.
Optionally, the encoding processing on the video stream data based on the line synchronization signal and the field synchronization signal to obtain encoded video stream data includes:
and coding the video stream data based on the line synchronizing signal, the field synchronizing signal and the brightness adjusting signal to obtain coded video stream data.
Optionally, the buffering the decoded video stream data in the corresponding buffer area includes:
and setting a buffer area in the scanning playing control module, and buffering the decoded video stream data in the buffer area according to a first-in first-out data structure.
Optionally, the scanning and playing control module scans according to the sequence of the decoded video stream data cached in the decoding module to form a screen display control signal, and the scanning and playing control module includes:
and the scanning playing control module carries out scanning extraction processing on the screen display control signal according to the first-in first-out sequence of the cached decoded video stream data in the cache region to form the screen display control signal.
In addition, the embodiment of the invention also provides a display control system of the LED display screen, which comprises an upper computer, the display control system and the LED display screen, wherein the input end of the display control system is connected with the upper computer, and the output end of the display control system is connected with the LED display screen; wherein the system is configured to perform the display control method of any one of the above.
In the embodiment of the invention, the display control of the LED display screen is realized, and the display content of the LED display screen can be more exquisite; the advantages of the other respective portions are exhibited in the embodiments.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a display control method for an LED display screen according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display control system of an LED display screen in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, fig. 1 is a flowchart illustrating a display control method for an LED display screen according to an embodiment of the present invention.
As shown in fig. 1, a display control method of an LED display screen includes an upper computer, a display control system and an LED display screen, wherein an input end of the display control system is connected to the upper computer, and an output end of the display control system is connected to the LED display screen; the method comprises the following steps:
s11: the display control system receives video signal data sent by the upper computer and converts the video signal data into video stream data;
in a specific implementation process of the present invention, after converting the video signal data into video stream data, the method further includes: scaling the video stream data according to the size of an LED display screen to obtain the scaled video stream data; RGB gray data of each pixel in the video stream data after scaling is extracted, and gray adjustment processing of an LED display screen is carried out on the basis of the RGB gray data of each pixel to form a brightness adjustment signal.
Further, the scaling the video stream data according to the size of the LED display screen to obtain the scaled video stream data includes: and carrying out scaling processing on the video stream data according to the size of the LED display screen by using a bicubic interpolation scaling algorithm to obtain the scaled video stream data.
Further, the scaling the video stream data according to the size of the LED display screen by using a bicubic interpolation scaling algorithm to obtain scaled video stream data includes: obtaining a first resolution size of a video frame in the video stream data and a second resolution size of the LED display screen; calculating a scaling ratio based on the first resolution size and the second resolution size; carrying out scaling mapping processing on the corresponding video frames in the video stream data based on the scaling proportion, and scaling the mapping result; selecting 16 pixels which are nearest to the target pixel in the scaling mapping result to calculate the weight of the target pixel, and obtaining the weight of the target pixel; calculating influence factors between target pixel points in the scaling mapping result and the weights of the corresponding target pixel points based on a bicubic interpolation function to obtain the influence factors of the target pixel points; and substituting the influence factors of the target pixel points into a pixel gray level calculation function to calculate the pixel values of the target pixel points, and obtaining the video stream data after scaling based on the pixel values of the target pixel points.
Further, the performing a gray scale adjustment process of the LED display screen based on the RGB gray scale data of each pixel to form a brightness adjustment signal includes: adjusting the forward current processing flowing through the LED display screen based on the RGB gray scale data of each pixel to form a brightness adjusting signal; or, based on RGB gray data of each pixel, the gray adjustment processing of the LED display screen is carried out by a pulse width adjustment mode, and a brightness adjustment signal is formed.
Further, the gray scale adjustment processing on the LED display screen by using a pulse width modulation method based on the RGB gray scale data of each pixel to form a brightness adjustment signal includes: and carrying out gray scale adjustment processing on the LED display screen by utilizing the proportional relation between the pulse width and the adjustment period based on the RGB gray scale data of each pixel to form a brightness adjustment signal.
Specifically, the upper computer may be a PC computer, a tablet computer, a handheld intelligent terminal, or other device, and after being connected to the display control system through the digital video interface, the upper computer sends video signal data to the display control system, and then after receiving the sent video signal data, the display control system performs conversion processing on the video signal data, so as to form video stream data for subsequent playing on the LED display screen.
After obtaining video stream data, firstly, scaling the video stream data according to the size of an LED display screen, and obtaining the scaled video stream data after scaling; then, RGB gray data of each pixel in the scaled video stream data needs to be extracted, and gray adjustment processing of the LED display screen is performed according to the RGB gray data of each pixel to form a brightness adjustment signal.
When the video stream data is subjected to scaling processing, the video stream data is subjected to scaling processing by utilizing a bicubic interpolation scaling algorithm according to the size of an LED display screen to obtain the scaled video stream data; in the application, the scaling processing is performed by using a bicubic interpolation scaling algorithm, and compared with a nearest neighbor interpolation algorithm and a bilinear interpolation algorithm, the details of image data in video stream data can be reserved under the maximum condition, so that an image in the scaled video stream data is smoother.
When scaling processing is carried out, firstly, a first resolution of a video frame in video stream data and a second resolution of an LED display screen are required to be obtained; then, the scaling ratio can be obtained by calculation according to the first resolution and the second resolution; carrying out scaling mapping processing on the corresponding video frames in the video stream data according to the scaling proportion, and scaling the mapping result; selecting 16 pixels which are nearest to the target pixel in the scaling mapping result to calculate the weight of the target pixel, and obtaining the weight of the target pixel; then calculating influence factors between the target pixel points in the scaling mapping result and the weights of the corresponding target pixel points according to the bicubic interpolation function to obtain the influence factors of the target pixel points; and substituting the influence factors of the target pixel points into a pixel gray level calculation function to calculate the pixel values of the target pixel points, and obtaining the video stream data after scaling according to the pixel values of the target pixel points.
Assuming that the resolution of the corresponding video frame in the video stream data is M × N, the video stream data can be regarded as an M × N source image, and the second resolution size M × N of the LED display screen can be regarded as an M × N scaled image; calculating each pixel point in the zoomed image according to the zoom ratio to obtain a corresponding point in the source image of M × N, for example, the position P of the pixel point P (X, Y) in the source image of the zoomed image is P (X × M), Y × N); after the corresponding positions of the pixel points of the zoomed image in the corresponding source image are obtained, selecting 16 nearest pixel points of the pixel points to calculate the weight of the pixel points of the zoomed image, wherein the weight value of each pixel point of the zoomed image can be calculated one by one as the value of each pixel point in the source image is known; the bicubic interpolation scaling algorithm is to calculate the influence factors between the corresponding pixel point p in the source image and the 16 pixel points nearest to the pixel point according to a bicubic interpolation function, so that the value of the corresponding pixel point in the scaled image is calculated by substituting the influence factors into a pixel gray scale calculation function, and the purpose of image scaling is achieved.
In the application, the gray scale adjustment processing of the LED display screen comprises a current control mode and a pulse width modulation mode, namely, the forward current processing flowing through the LED display screen is adjusted according to the RGB gray scale data of each pixel to form a brightness adjustment signal; or, the gray scale of the LED display screen is adjusted by a pulse width adjustment mode according to the RGB gray scale data of each pixel to form a brightness adjustment signal.
In the current control mode, the LED is realized by utilizing the photoelectric characteristic curve of the LED, after the LED is conducted in the forward direction, the brightness of the LED is in direct proportion to the magnitude of the forward current, the forward current is increased, the brightness of the LED is also required to be increased, the photoelectric curves of the red, green and blue three primary colors of the LED are slightly different, the brightness change rate of a blue tube core is greater than that of the rest red, green and blue colors, the current is more equal and subdivided in a certain current range, and the multi-gray-scale adjustment control of the LED display screen can be realized.
When the pulse width modulation mode is used for gray level adjustment, the human eye persistence phenomenon is utilized, and the equivalent luminous brightness of the LED light-emitting diode is changed along with the change of the duty ratio by controlling the on-off time ratio and the duty ratio of the LED light-emitting diode within a certain time, so that the gray level adjustment processing is realized; that is, in a unit period, the luminance at 100% duty ratio is assumed to be YmaxThen, the relationship between the brightness Y and the pulse width T under any duty ratio condition and the regulation period T is: y = Ymax(T/T); the PWM gray scale adjustment mode adopting the constant current mode ensures that the forward conduction current of the LED is constant, so that the maximum luminous brightness has stability, the frequency period of the PWM also has stability, and the stable equivalent luminous brightness can be obtained by adjusting the duty ratio.
S12: acquiring a horizontal synchronizing signal and a field synchronizing signal of the video stream data, and encoding the video stream data based on the horizontal synchronizing signal and the field synchronizing signal to acquire encoded video stream data;
in a specific implementation process of the present invention, the encoding processing on the video stream data based on the line synchronization signal and the field synchronization signal to obtain encoded video stream data includes: and coding the video stream data based on the line synchronizing signal, the field synchronizing signal and the brightness adjusting signal to obtain coded video stream data.
Specifically, firstly, a horizontal synchronizing signal and a field synchronizing signal of video stream data are obtained, and then the video stream data are coded according to the horizontal synchronizing signal, the field synchronizing signal and a brightness adjusting signal to obtain coded video stream data.
S13: a scanning playing control module arranged in the display control system decodes the coded video stream data and caches the decoded video stream data in a corresponding cache region;
in a specific implementation process of the present invention, the caching the decoded video stream data in a corresponding cache region includes: and setting a buffer area in the scanning playing control module, and buffering the decoded video stream data in the buffer area according to a first-in first-out data structure.
Specifically, a scanning playing control module is also arranged in the display control system, and the scanning playing control module is mainly used for decoding, caching and scanning coded video stream data to form a screen display control signal; a scanning playing control module arranged in the display control system decodes the coded video stream data and caches the decoded video stream data in a corresponding cache region; the buffer area is arranged in the scanning playing control module, and when the decoding video stream data is buffered, the buffering is carried out in the buffer area according to a first-in first-out data structure.
S14: the scanning playing control module scans according to the sequence of the decoded video stream data cached in the decoding playing control module to form a screen display control signal;
in a specific implementation process of the present invention, the scanning and playing control module scans according to the sequence of the decoded video stream data cached in the decoding module to form a screen display control signal, and the scanning and playing control module includes: and the scanning playing control module carries out scanning extraction processing on the screen display control signal according to the first-in first-out sequence of the cached decoded video stream data in the cache region to form the screen display control signal.
Specifically, the scanning playing control module performs scanning extraction processing on the screen display control signal according to the first-in first-out sequence of the data structure of the decoded video stream data cache cached in the cache region to form the screen display control signal.
S15: and outputting the screen display control signal to the LED display screen, and controlling the LED display screen to display and play based on the screen display control signal.
In the specific implementation process of the invention, after the screen display control signal is output to the LED display screen, the LED display screen is controlled to display and play according to the screen display control signal.
In the embodiment of the invention, the display control of the LED display screen is realized, and the display content of the LED display screen can be more exquisite.
Example two
Referring to fig. 2, fig. 2 is a schematic structural composition diagram of a display control system of an LED display screen according to an embodiment of the present invention.
As shown in fig. 2, a display control system of an LED display screen includes an upper computer 31, a display control system 32 and an LED display screen 33, wherein an input end of the display control system 32 is connected to the upper computer 31, and an output end thereof is connected to the LED display screen 33; wherein the system is configured to perform the display control method of any one of the above.
In the embodiments of the present invention, the implementation process of the system item can refer to the embodiments of the method part, and is not described herein again.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
In addition, the display control method and system for the LED display screen according to the embodiments of the present invention are described in detail, and a specific example is used herein to explain the principle and the implementation manner of the present invention, and the description of the embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The display control method of the LED display screen is characterized by comprising an upper computer, a display control system and the LED display screen, wherein the input end of the display control system is connected with the upper computer, and the output end of the display control system is connected with the LED display screen; the method comprises the following steps:
the display control system receives video signal data sent by the upper computer and converts the video signal data into video stream data;
acquiring a horizontal synchronizing signal and a field synchronizing signal of the video stream data, and encoding the video stream data based on the horizontal synchronizing signal and the field synchronizing signal to acquire encoded video stream data;
a scanning playing control module arranged in the display control system decodes the coded video stream data and caches the decoded video stream data in a corresponding cache region;
the scanning playing control module scans according to the sequence of the decoded video stream data cached in the decoding playing control module to form a screen display control signal;
and outputting the screen display control signal to the LED display screen, and controlling the LED display screen to display and play based on the screen display control signal.
2. The display control method according to claim 1, wherein after converting the video signal data into video stream data, further comprising:
scaling the video stream data according to the size of an LED display screen to obtain the scaled video stream data;
RGB gray data of each pixel in the video stream data after scaling is extracted, and gray adjustment processing of an LED display screen is carried out on the basis of the RGB gray data of each pixel to form a brightness adjustment signal.
3. The method according to claim 2, wherein the scaling the video stream data according to the size of the LED display screen to obtain the scaled video stream data comprises:
and carrying out scaling processing on the video stream data according to the size of the LED display screen by using a bicubic interpolation scaling algorithm to obtain the scaled video stream data.
4. The method according to claim 3, wherein the scaling the video stream data according to the size of the LED display screen by using a bicubic interpolation scaling algorithm to obtain scaled video stream data comprises:
obtaining a first resolution size of a video frame in the video stream data and a second resolution size of the LED display screen;
calculating a scaling ratio based on the first resolution size and the second resolution size;
carrying out scaling mapping processing on the corresponding video frames in the video stream data based on the scaling proportion, and scaling the mapping result;
selecting 16 pixels which are nearest to the target pixel in the scaling mapping result to calculate the weight of the target pixel, and obtaining the weight of the target pixel;
calculating influence factors between target pixel points in the scaling mapping result and the weights of the corresponding target pixel points based on a bicubic interpolation function to obtain the influence factors of the target pixel points;
and substituting the influence factors of the target pixel points into a pixel gray level calculation function to calculate the pixel values of the target pixel points, and obtaining the video stream data after scaling based on the pixel values of the target pixel points.
5. The display control method according to claim 2, wherein the performing of the gradation adjustment process of the LED display screen based on the RGB gradation data of each pixel to form the luminance adjustment signal comprises:
adjusting the forward current processing flowing through the LED display screen based on the RGB gray scale data of each pixel to form a brightness adjusting signal; or the like, or, alternatively,
and carrying out gray scale adjustment processing on the LED display screen by utilizing a pulse width adjustment mode based on the RGB gray scale data of each pixel to form a brightness adjustment signal.
6. The display control method according to claim 5, wherein the forming a luminance adjustment signal by the gray scale adjustment process of the LED display screen based on the RGB gray scale data of each pixel by the pulse width modulation method includes:
and carrying out gray scale adjustment processing on the LED display screen by utilizing the proportional relation between the pulse width and the adjustment period based on the RGB gray scale data of each pixel to form a brightness adjustment signal.
7. The method according to claim 1, wherein said encoding the video stream data based on the line sync signal and the field sync signal to obtain encoded video stream data comprises:
and coding the video stream data based on the line synchronizing signal, the field synchronizing signal and the brightness adjusting signal to obtain coded video stream data.
8. The method according to claim 1, wherein buffering the decoded video stream data in a corresponding buffer area comprises:
and setting a buffer area in the scanning playing control module, and buffering the decoded video stream data in the buffer area according to a first-in first-out data structure.
9. The display control method according to claim 1, wherein the scanning and playing control module scans according to the sequence of the decoded video stream data buffered in the buffer to form an on-screen display control signal, and comprises:
and the scanning playing control module carries out scanning extraction processing on the screen display control signal according to the first-in first-out sequence of the cached decoded video stream data in the cache region to form the screen display control signal.
10. A display control system of an LED display screen is characterized by comprising an upper computer, a display control system and the LED display screen, wherein the input end of the display control system is connected with the upper computer, and the output end of the display control system is connected with the LED display screen; wherein the system is configured to perform the display control method of any of the preceding claims 1-9.
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