CN112927648A - Display control method and device, module control card and LED display screen - Google Patents
Display control method and device, module control card and LED display screen Download PDFInfo
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- CN112927648A CN112927648A CN201911246493.6A CN201911246493A CN112927648A CN 112927648 A CN112927648 A CN 112927648A CN 201911246493 A CN201911246493 A CN 201911246493A CN 112927648 A CN112927648 A CN 112927648A
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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 embodiment of the invention relates to a display control method and device, a module control card and an LED display screen. The display control method includes, for example: receiving a video source; analyzing the video source to obtain a field synchronization signal and image data; identifying a frame frequency and a phase of the field sync signal; responding to the frame frequency within a preset frame frequency threshold range, and performing frequency multiplication on the field synchronizing signal according to the frame frequency and the phase to obtain an N frequency multiplication field synchronizing signal, wherein N is a positive integer greater than 1; and generating and outputting display data and a display control signal according to the N frequency multiplication field synchronizing signal and the image data so as to display a video image. The embodiment of the invention realizes the display control of the video image and can solve the problem of flicker when a low-frame-frequency video source is displayed, thereby greatly improving the display effect of the video image.
Description
Technical Field
The invention relates to the technical field of display control, in particular to a display control method, a display control device, a module control card and an LED display screen.
Background
In the display industry of LED (Light Emitting Diode) display screens, an LED driving chip is a constant current driving chip, and the display gray scale of the display screen is adjusted by a PWM (Pulse width modulation) duty ratio. When the LED display screen displays low gray, the duty ratio of PWM is small, the period is large, when the low-frame-frequency video source displays, the period is enlarged to cause the period to be larger, and therefore the problem of flicker of the low-frame-frequency video source when the LED display screen displays is caused.
Disclosure of Invention
Therefore, to overcome the defects and shortcomings in the prior art, embodiments of the present invention provide a display control method, a display control device, a module control card and an LED display screen, which solve the problem of flicker in low frame frequency video source display while achieving video image display control.
In one aspect, a display control method provided in an embodiment of the present invention includes: receiving a video source; analyzing the video source to obtain a field synchronization signal and image data; identifying a frame frequency and a phase of the field sync signal; responding to the frame frequency within a preset frame frequency threshold range, and performing frequency multiplication on the field synchronizing signal according to the frame frequency and the phase to obtain an N frequency multiplication field synchronizing signal, wherein N is a positive integer greater than 1; and generating and outputting display data and a display control signal according to the N frequency multiplication field synchronizing signal and the image data so as to display a video image.
According to the display control method, the field synchronizing signal and the image data are obtained by analyzing the video source, the frame frequency of the field synchronizing signal is identified, the field synchronizing signal is subjected to frequency multiplication processing when the frame frequency is within the range of the preset frame frequency threshold value to obtain the N frequency multiplication field synchronizing signal, the video source is controlled to display according to the N frequency multiplication field synchronizing signal, the problem of flicker when the low-frame-frequency video source is displayed is solved, and the display effect of the video source is improved.
In an embodiment of the present invention, the preset frame frequency threshold range is equal to or less than 60 Hz.
In an embodiment of the present invention, the performing, in response to that the frame frequency is within a preset frame frequency threshold range, a frequency doubling process on the field synchronization signal according to the frame frequency and the phase to obtain an N-frequency doubled field synchronization signal specifically includes: acquiring a frequency multiplication factor N; and generating the N frequency multiplication field synchronizing signal according to the frame frequency, the phase and the frequency multiplication factor N.
In an embodiment of the present invention, the generating and outputting display data and a display control signal according to the N-times frequency field synchronizing signal and the image data to perform video image display specifically includes: and generating the display data and the display control signal according to the image data of the same frame for N times continuously under the control of the N frequency multiplication field synchronous signal.
On the other hand, an embodiment of the present invention provides a display control apparatus, including: the receiving module is used for receiving a video source; the analysis module is used for analyzing the video source to acquire a field synchronization signal and image data; the identification module is used for identifying the frame frequency and the phase of the field synchronization signal; the frequency doubling module is used for responding to the situation that the frame frequency is within the preset frame frequency threshold range, and performing frequency doubling processing on the field synchronizing signal according to the frame frequency and the phase to obtain an N frequency doubling field synchronizing signal, wherein N is a positive integer greater than 1; and the output module is used for generating and outputting display data and display control signals according to the N frequency multiplication field synchronizing signals and the image data so as to display video images.
The display control device of the embodiment is provided with a receiving module, an analyzing module, an identifying module, a frequency doubling module and an output module, so that a field synchronizing signal and image data can be obtained by receiving and analyzing a video source, the frame frequency of the field synchronizing signal can be identified, the field synchronizing signal is subjected to frequency doubling processing when the frame frequency is within a preset frame frequency threshold range to obtain an N frequency doubling field synchronizing signal, the video source display is controlled according to the N frequency doubling field synchronizing signal, the flicker problem during the display of a low-frame-frequency video source is solved, and the display effect of video images is improved.
In an embodiment of the present invention, the preset frame frequency threshold range is equal to or less than 60 Hz.
In one embodiment of the present invention, the frequency doubling module includes: an obtaining unit, configured to obtain a frequency multiplication factor N; and the generating unit is used for generating the N frequency multiplication field synchronizing signal according to the frame frequency, the phase and the frequency multiplication factor N.
In one embodiment of the present invention, the output module includes: and the generating unit is used for generating the display data and the display control signal according to the image data of the same frame for N times continuously under the control of the N frequency multiplication field synchronizing signal.
In another aspect, an embodiment of the present invention provides a module control card, including: a microprocessor; the programmable logic device is electrically connected with the microprocessor and is used for executing any one display control method; and the memory is electrically connected with the programmable logic device and used as the cache of the image data.
The module control card of the embodiment can obtain a field synchronizing signal and image data by receiving and analyzing a video source, identify the frame frequency of the field synchronizing signal, perform frequency doubling processing on the field synchronizing signal when the frame frequency is within a preset frame frequency threshold range to obtain an N-frequency doubling field synchronizing signal, and control video image display according to the N-frequency doubling field synchronizing signal, so that the problem of flicker when a low-frame-frequency video source is displayed is solved, and the display effect of video images is improved.
In another aspect, an LED display screen provided in an embodiment of the present invention includes the module control card, wherein the module control card further includes an ethernet interface circuit electrically connected to the programmable logic device; and the LED lamp panel is electrically connected with the Ethernet interface circuit.
The LED display screen can obtain the field synchronizing signal and the image data by receiving and analyzing the video source, identify the frame frequency of the field synchronizing signal, perform frequency doubling processing on the field synchronizing signal when the frame frequency is within the range of the preset frame frequency threshold value to obtain the N frequency doubling field synchronizing signal, and control the display of the video source according to the N frequency doubling field synchronizing signal, so that the problem of flicker when the low-frame-frequency video source is displayed is solved, and the display effect of the video image is improved.
As can be seen from the above, the above technical features of the present invention may have one or more of the following advantages: according to the display control method, the display control device, the module control card and the LED display screen, the field synchronizing signal and the image data can be obtained by receiving and analyzing the video source, the frame frequency of the field synchronizing signal is identified, the field synchronizing signal is subjected to frequency doubling processing when the frame frequency is within the range of the preset frame frequency threshold value to obtain the N frequency doubling field synchronizing signal, the video source display is controlled according to the N frequency doubling field synchronizing signal, the flicker problem when the low-frame-frequency video source is displayed can be solved, and the display effect of the video image is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a display control method according to a first embodiment of the invention.
Fig. 2 is a flowchart illustrating sub-steps of step S40 in fig. 1.
Fig. 3 is a flowchart illustrating sub-steps of step S50 in fig. 1.
Fig. 4 is a schematic structural diagram of an LED display screen according to a first embodiment of the present invention.
Fig. 5A and 5B are schematic structural diagrams of two embodiments of the ethernet interface circuit in fig. 4.
FIG. 6 is a schematic structural diagram of the module control card shown in FIG. 4.
Fig. 7 is a schematic diagram of a field sync signal and a processed N-times frequency field sync signal.
Fig. 8 is a block diagram of a display control apparatus according to a second embodiment of the present invention.
Fig. 9 is a schematic diagram of the unit composition of the frequency doubling module in fig. 8.
Fig. 10 is a schematic diagram of a unit composition of the output module in fig. 8.
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.
[ first embodiment ] A method for manufacturing a semiconductor device
As shown in fig. 1, a display control method according to a first embodiment of the present invention includes:
s10, receiving a video source;
s20, analyzing the video source to obtain a field synchronization signal and image data;
s30, identifying a frame rate and a phase of the field sync signal;
s40, responding to the frame frequency being within a preset frame frequency threshold range, performing frequency doubling processing on the field synchronizing signal according to the frame frequency and the phase to obtain an N frequency doubling field synchronizing signal, wherein N is a positive integer greater than 1; and
and S50, generating and outputting display data and display control signals according to the N frequency multiplication field synchronizing signals and the image data so as to display video images.
As shown in fig. 2, in response to that the frame frequency is within a preset frame frequency threshold range, step S40 performs frequency doubling on the field synchronization signal according to the frame frequency and the phase to obtain an N-frequency doubled field synchronization signal, where N is a positive integer greater than 1, and specifically includes:
s41, obtaining a frequency multiplication factor N;
and S42, generating the N-times frequency field synchronizing signal according to the frame frequency, the phase and the frequency multiplication factor N.
By acquiring the frequency doubling factor N and generating the N frequency doubling field synchronizing signal according to the frame frequency, the phase and the frequency doubling factor N, the frequency doubling factor can be provided for a user to select, so that different requirements of different users on image quality can be met, and the user experience degree is improved.
As shown in fig. 3, the step S50 of generating and outputting display data and display control signals according to the N-times frequency field synchronizing signal and the image data to perform video image display specifically includes:
and S51, generating the display data and the display control signal according to the image data of the same frame for N times continuously under the control of the N frequency multiplication field synchronous signal.
The display data and the display control signal are generated according to the image data of the same frame for N times continuously under the control of the N frequency multiplication field synchronous signal, so that the image data of the same frame is displayed for N times continuously, the problem of flicker when a low-frame-frequency video source is displayed is solved, and the display effect of video images is improved.
In order to more clearly understand the present embodiment, the display control method of the present embodiment will be exemplified in detail below with reference to fig. 4, 5A, 5B, and 6.
Referring to fig. 4, an LED display screen 100 is shown, which includes a module control card 200 and an LED lamp panel 300 connected to the module control card 200. For illustrative purposes, only one module control card 200 and one LED light panel 300 are shown in fig. 4, and in other embodiments, the LED display screen 100 may include a plurality of module control cards 200 and a plurality of LED light panels 300, and each module control card 200 may be connected to one or more LED light panels 300, for example. The module control card 200 may be, for example, a receiving card or a scanning card.
Specifically, as shown in fig. 4, module control card 200 may include, for example, a microprocessor 210, a programmable logic device 220, and a memory 230, where programmable logic device 220 is electrically connected to microprocessor 210, and memory 230 is electrically connected to programmable logic device 220. Module control card 200 also includes an Ethernet interface circuit 240, Ethernet interface circuit 240 electrically connects programmable logic device 220. The module control card 200 is connected to the LED lamp panel 300 through the ethernet interface circuit 240.
Specifically, the microprocessor 210 may be, for example, an MCU (Microcontroller Unit); the Programmable logic device 220 may be, for example, a Field Programmable Gate Array (FPGA); the Memory 230 may be, for example, a Double Data Rate (DDR) Memory, a Random Access Memory (RAM), etc., but the embodiment of the invention is not limited thereto.
As mentioned above, the ethernet interface circuit 240 (see fig. 5A) may, for example, include an ethernet physical layer transceiver 241 and a network interface 243, the network interface 243 electrically connects the ethernet physical layer transceiver 241, and the ethernet physical layer transceiver 241 electrically connects the programmable logic device 220. Preferably, as shown in fig. 5B, the ethernet interface circuit 240 may include an ethernet physical layer transceiver 241, a network transformer 242 and a port 243, the network transformer 242 is electrically connected between the ethernet physical layer transceiver 241 and the port 243, and the ethernet physical layer transceiver 241 is electrically connected to the programmable logic device 220. The ethernet PHY transceiver 241 may be, for example, a gigabit ethernet PHY chip, and the type of the network port 243 may be, for example, RJ45, although the embodiment is not limited thereto. Furthermore, the ethernet physical layer transceiver 241, the network transformer 242 and the network interface 243 in this embodiment are not limited to include only one, and may include a plurality of ethernet physical layer transceivers 241, network transformers 242 and network interfaces 243 (only one ethernet physical layer transceiver 241, one network transformer 242 and one network interface 243 are shown in fig. 5B as an example), and this embodiment is not limited in detail herein.
The display control method of the present embodiment can be applied to the LED display screen 100 described above, specifically, the display control method of the present embodiment is executed by the programmable logic device 220 in the module control card 200, specifically, for example, executed by the video source receiving module 221, the image processing module 222, the field synchronization signal processing module 223 and the display control module 224 included in the programmable logic device 220 described in fig. 6. The display control method of the present embodiment will be described in detail below, taking the display control of a video source having a frame frequency of 24Hz as an example.
Specifically, in order to realize the display of the video source with the frame frequency of 24Hz on the LED display screen 100, first, the video source is transmitted to the module control card 200 through a display controller such as a transmitting card, and then, the video source receiving module 221 of the programmable logic device 220 of the module control card 200 receives the video source and analyzes the video source to obtain the field synchronization signal and the image data, see fig. 7, the field synchronization signal is, for example, an a signal, the frame frequency is 24Hz, and the field synchronization signal is transmitted to the field synchronization signal processing module 223 and the field synchronization signal and the image data are transmitted to the image processing module 222.
The field sync signal processing module 223 receives the field sync signal, identifies the frame frequency and the phase of the field sync signal, and determines whether the frame frequency is within a preset frame frequency range. Specifically, the field sync signal processing module 223 may specifically identify the frame rate, for example, first identify a period of the field sync signal, and then obtain the frame rate according to the period; the preset frame frequency range may be, for example, less than or equal to 60Hz, and of course, the preset frame frequency range may also be other empirical value ranges, which is not limited in this embodiment. In the embodiment, the preset frame frequency range is a flicker frame frequency range, and when the frame frequency of the video source is in the flicker frame frequency range, the video source can be considered to have a flicker problem when being displayed on the LED display screen.
As mentioned above, since the frame frequency of the input video source is 24Hz, and the field synchronization signal processing module 223 determines that the frame frequency is smaller than 60Hz, that is, the frame frequency is within the preset frame frequency range, the field synchronization signal processing module 223 performs frequency doubling on the field synchronization signal according to the frame frequency and the phase to obtain an N-frequency doubled field synchronization signal, referring to fig. 7, the N-frequency doubled field synchronization signal after frequency doubling is a B signal, the frame frequency is 48Hz, and the N-frequency doubled field synchronization signal is sent to the display control module 224. In this embodiment, the default frequency doubling is a double frequency doubling, i.e. N is equal to 2, i.e. the frame frequency of the obtained new field sync signal is 48 Hz. In the above scheme, the field synchronization signal is frequency-multiplied to increase the frame frequency of the video source, so that the flicker problem when the low-frame-frequency video source is displayed can be solved.
The image data processing module 222 receives the image data and the field sync signal, processes the image data, generates display data according to the field sync signal and the processed image data, and stores the display data in the memory 230.
Then, the display control module 224 receives the N-times frequency field synchronizing signal, that is, the 48Hz field synchronizing signal, generates a control signal according to the 48Hz field synchronizing signal, continuously extracts the same frame of display data twice in the memory 230, and sends the frame of display data to the LED lamp panel 300 through the ethernet interface circuit 240, so as to control the video source to be displayed on the LED lamp panel 300. The control signals include, for example, a shift clock signal (DCLK), a latch signal (LAT), a display enable signal (OE), and a row decoding signal, and the display data is controlled by the control signals to be displayed on the LED lamp panel 300, so as to implement display of the video source.
In a specific implementation manner of this embodiment, for example, a selectable frequency multiplication factor N may be provided for a user, the user may select a required frequency multiplication factor N according to an actual situation, and after obtaining the frequency multiplication factor N, the module control card 200 performs frequency multiplication processing on the field synchronization signal according to the frame frequency, the phase, and the frequency multiplication factor N to obtain an N-frequency-multiplied field frequency signal. Specifically, for example, when the frame frequency is 24Hz, the field sync signal processing module 223 recognizes that the frequency multiplication factor N provided for the user to select is (2, 3), for example, when the frequency multiplication factor N selected by the user is 2, the frame frequency of the new field sync signal after frequency multiplication processing is 48 Hz. After the video source is displayed on the LED display screen according to the 48Hz field sync signal, the frequency doubling times may be reselected when the user is unsatisfied with the current display effect, and the module control card 200 executes the above steps again, which is not described herein again. The frequency doubling times are provided for users to select, so that different requirements of different users on image quality can be met, and the user experience is improved.
In a specific embodiment of this embodiment, for example, a video source frame frequency and target frame frequency comparison table is pre-stored in the module control card 200, when recognizing that the frame frequency of the field synchronization signal of the video source is 24Hz, the field synchronization signal processing module 223 in the module control card 200 obtains a target frame frequency corresponding to 24Hz, for example, 48Hz, by querying the video source frame frequency and target frame frequency comparison table, and the field synchronization signal processing module 223 performs frequency doubling on the field synchronization signal according to the target frame frequency 48Hz and the phase to generate a new field synchronization signal with a frame frequency of 48 Hz. For example, the video source frame rate to target frame rate comparison table may represent, for example: when the video source frame frequency is 24Hz, the corresponding target frame frequency is 48Hz or 96 Hz; when the frame frequency of the video source is 25Hz, the corresponding target frame frequency is 50Hz or 100 Hz; when the frame frequency of the video source is 30Hz, the corresponding target frame frequency is 60Hz or 120 Hz; when the frame frequency of the video source is 48Hz, the corresponding target frame frequency is 96 Hz; when the frame frequency of the video source is 50Hz, the corresponding target frame frequency is 100 Hz; when the frame frequency of the video source is 60Hz, the corresponding target frame frequency is 120 Hz; when the frame frequency of the video source is 72Hz, the corresponding target frame frequency is 72 Hz; when the frame frequency of the video source is 75Hz, the corresponding target frame frequency is 75Hz, which is not limited in the embodiments of the present invention. It should be noted that when the field sync signal processing module 223 identifies the frame frequency of the field sync signal of the video source, it may directly query the comparison table of the frame frequency of the video source and the target frame frequency to generate a new field sync signal, that is, it may not be determined whether the frame frequency is within the preset frame frequency range. In addition, the video source frame rate and the target frame rate comparison table of the present embodiment may be stored in the memory 230 of the module control card 200 in the form of a comparison table, or may be used in other manners only applying the contents thereof, which is not limited herein.
In summary, the display control method of the embodiment can obtain the field synchronization signal and the image data by receiving and analyzing the video source and identify the frame frequency of the field synchronization signal, perform frequency doubling processing on the field synchronization signal when the frame frequency is within the preset frame frequency threshold range to obtain the N-frequency doubled field synchronization signal, and control the video source to display according to the N-frequency doubled field synchronization signal, thereby solving the problem of flicker when displaying the low-frame-frequency video source and improving the display effect of the video image.
[ second embodiment ]
As shown in fig. 8, a display control apparatus 400 according to a second embodiment of the present invention includes: a receiving module 410, a parsing module 420, an identifying module 430, a frequency doubling module 440, and an output module 450.
A receiving module 410 for receiving a video source; an analyzing module 420, configured to analyze the video source to obtain a field sync signal and image data; an identifying module 430 for identifying a frame frequency and a phase of the field sync signal; a frequency doubling module 440, configured to perform frequency doubling on the field synchronization signal according to the frame frequency and the phase to obtain an N-frequency doubled field synchronization signal in response to that the frame frequency is within the preset frame frequency threshold range, where N is a positive integer greater than 1; and an output module 450, configured to generate and output display data and a display control signal according to the N-times frequency field synchronization signal and the image data, so as to perform video image display.
As shown in fig. 9, the frequency doubling module 440 includes an obtaining unit 441 and a generating unit 442. An obtaining unit 441, configured to obtain a frequency multiplication factor N; a generating unit 442, configured to generate the N-times field synchronization signal according to the frame frequency, the phase, and the frequency multiplication factor N.
As shown in fig. 10, the output module 450 includes a generating unit 451, and the generating unit 451 is configured to generate the display data and the display control signal according to the image data of the same frame N times in succession under the control of the N-times frequency field synchronizing signal.
In a specific implementation manner of this embodiment, the preset frame frequency threshold range is less than or equal to 60 Hz.
The specific operation and technical effects between the modules in the display control apparatus 400 in this embodiment are described in the foregoing first embodiment.
In addition, it should be understood that the foregoing embodiments are merely exemplary illustrations of the present invention, and the technical solutions of the embodiments can be arbitrarily combined and collocated without conflict between technical features and structural contradictions, which do not violate the purpose of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a division of a unit is merely a division of one logic function, and an actual implementation may have another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may also be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, each functional unit/module in the embodiments of the present invention may be integrated into one processing unit/module, or each unit/module may exist alone physically, or two or more units/modules may be integrated into one unit/module. The integrated units/modules may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units/modules.
The integrated units/modules, which are implemented in the form of software functional units/modules, may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing one or more processors of a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A display control method, comprising:
receiving a video source;
analyzing the video source to obtain a field synchronization signal and image data;
identifying a frame frequency and a phase of the field sync signal;
responding to the frame frequency within a preset frame frequency threshold range, and performing frequency multiplication on the field synchronizing signal according to the frame frequency and the phase to obtain an N frequency multiplication field synchronizing signal, wherein N is a positive integer greater than 1; and
and generating and outputting display data and a display control signal according to the N frequency multiplication field synchronizing signal and the image data so as to display a video image.
2. The display control method according to claim 1, wherein the preset frame frequency threshold range is equal to or less than 60 Hz.
3. The method according to claim 1, wherein the performing a frequency multiplication process on the field sync signal according to the frame frequency and the phase to obtain an N-frequency multiplied field sync signal in response to the frame frequency being within a preset frame frequency threshold range includes:
acquiring a frequency multiplication factor N;
and generating the N frequency multiplication field synchronizing signal according to the frame frequency, the phase and the frequency multiplication factor N.
4. The display control method according to claim 1, wherein the generating and outputting display data and display control signals according to the N-times frequency field synchronization signal and the image data for video image display comprises:
and generating the display data and the display control signal according to the image data of the same frame for N times continuously under the control of the N frequency multiplication field synchronous signal.
5. A display control apparatus, characterized by comprising:
the receiving module is used for receiving a video source;
the analysis module is used for analyzing the video source to acquire a field synchronization signal and image data;
the identification module is used for identifying the frame frequency and the phase of the field synchronization signal;
the frequency doubling module is used for responding to the situation that the frame frequency is within the preset frame frequency threshold range, and performing frequency doubling processing on the field synchronizing signal according to the frame frequency and the phase to obtain an N frequency doubling field synchronizing signal, wherein N is a positive integer greater than 1;
and the output module is used for generating and outputting display data and display control signals according to the N frequency multiplication field synchronizing signals and the image data so as to display video images.
6. The display control apparatus according to claim 5, wherein the preset frame frequency threshold range is 60Hz or less.
7. The display control apparatus of claim 5, wherein the frequency doubling module comprises:
an obtaining unit, configured to obtain a frequency multiplication factor N;
and the generating unit is used for generating the N frequency multiplication field synchronizing signal according to the frame frequency, the phase and the frequency multiplication factor N.
8. The display control apparatus of claim 5, wherein the output module comprises:
and the generating unit is used for generating the display data and the display control signal according to the image data of the same frame for N times continuously under the control of the N frequency multiplication field synchronizing signal.
9. A module control card, comprising:
a microprocessor;
a programmable logic device electrically connected to the microprocessor and configured to perform the display control method according to any one of claims 1 to 4; and
and the memory is electrically connected with the programmable logic device and used as the buffer memory of the image data.
10. An LED display screen, comprising:
the module control card of claim 9, wherein said module control card further comprises an ethernet interface circuit electrically connected to said programmable logic device; and
and the LED lamp panel is electrically connected with the Ethernet interface circuit.
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