CN112435627A - LED display control system - Google Patents
LED display control system Download PDFInfo
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- CN112435627A CN112435627A CN202011417554.3A CN202011417554A CN112435627A CN 112435627 A CN112435627 A CN 112435627A CN 202011417554 A CN202011417554 A CN 202011417554A CN 112435627 A CN112435627 A CN 112435627A
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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]
Abstract
The invention discloses an LED display control system, which comprises a driving power supply, belongs to the technical field of spherical screen display, and is characterized in that: the system also comprises a vision computer, a video image processor, an optical transceiver, a video transmitter, a video receiving card and a controller which are electrically connected; the view computer is used for synchronously outputting video images applied by a plurality of channels; the video image processor is used for realizing pixel-level geometric correction and image cropping of the applied video image; the video transmitter is used for carrying out interface conversion on the digital video signal; the video receiving card receives video data sent by the video sender; the controller controls the power-on time sequence of the LED display screen and detects the overvoltage, overcurrent and overtemperature of the power supply of the LED display screen. The display pixels are uniformly distributed, and secondary correction of brightness and color is not needed; image fusion at the edge and consistency correction of brightness and color are not needed, image processing steps are simpler and more convenient, and maintenance cost is low.
Description
Technical Field
The invention relates to the technical field of spherical screen display, in particular to an LED display control system.
Background
The immersion type spherical screen display adopts a projection display technology, and the spherical screen display function is realized by adopting an image splicing and fusion mode through a plurality of projectors, so that on one hand, the full-field display is difficult to realize, and especially in a real image display system, once an observer or an object is in the system, a part of display area can be shielded; on the other hand, the display mode needs image splicing and image fusion besides image geometric correction, and because the splicing and fusion area is large, the pixel utilization rate of each actual projector is very small.
At present, the applications in the LED spherical field mainly include LED outer spherical surface display, LED dome display and LED hemispherical surface display, and the applications mainly focus on commercial advertising and exhibition of science and technology museums. In addition, in the current LED spherical display technology, the synchronism of video signals is also an important index in the field of flight simulation training.
Chinese patent publication No. CN 107481207a, published as 2017, 12 and 15, discloses a method for geometric correction of video images, which is characterized by comprising:
the digital camera shoots an image projected by each projector independently; processing and matrix transformation calculation are carried out on the image, and a projection area of each projector after distortion on the projection screen is obtained;
calculating an outer enclosure box of the whole projection wall;
calculating the relative position of the projection area of each projector in the outer bounding box according to the outer bounding box, and obtaining the position coordinates of the relative position;
and mapping the video image to be displayed to the relative position according to the position coordinate, and correctly splicing the projected video image.
The geometric correction method for the video image disclosed in the patent document can perform geometric correction on the video image, and realize correct splicing of the projected video image automatically. However, there is an image overlap at the channel edges during projection stitching, resulting in the edge regions displaying images with different brightness and color from the other regions. Meanwhile, the common band exists at the edge of the channel, so that the pixel utilization rate of each channel is reduced, and in addition, the projector projects images from different azimuth angles, the problem of uneven distribution of display pixels also exists, image deformation and uneven brightness and chroma can also be caused, and extra control and secondary correction processing are needed; and in the later period, the common belt also needs to be corrected again in each maintenance process, so that the maintenance cost is high.
Disclosure of Invention
The invention provides an LED display control system for overcoming the defects of the prior art, the LED display is active display, and has higher display brightness and contrast than a passive display mode of a projector, a single LED lamp bead is an image pixel, the pixels are distributed at equal intervals along the longitude and latitude lines of a spherical surface, the display pixels are uniformly distributed, and secondary correction of brightness and color is not needed; the LED belongs to a semiconductor light-emitting device, has higher response speed and longer service life, displays have higher response speed, and displays have longer service life; the display frames of the LED spherical screen display screen are spliced into a whole through pixels, the problem of a public pixel band does not exist, so that the image processing only needs geometric correction from a plane to a spherical surface, image fusion at the edge and consistency correction of brightness and color are not needed, the image processing steps are simpler and more convenient, and the maintenance cost is low.
The invention is realized by the following technical scheme:
an LED display control system comprises a driving power supply, and is characterized in that: the system also comprises a vision computer, a video image processor, an optical transceiver, a video transmitter, a video receiving card and a controller which are electrically connected; the vision computer adopts a graphic workstation and is used for synchronously outputting video images applied by a plurality of channels; the video image processor is used for realizing pixel-level geometric correction and image cropping of the application video image; the optical transceiver adopts a hardware conversion chip to convert electricity and light and is used for long-distance real-time transmission of high-definition video; the video transmitter is used for performing interface conversion on the digital video signal and transmitting the digital video signal to the spherical screen display terminal through the gigabit Ethernet; the video receiving cards are distributed discretely along with the LED lamp panels and are connected in series through gigabit Ethernet to receive video data sent by the video transmitter, and the video receiving cards are connected with the LED lamp panels and transmit the data in a parallel port mode; the controller is used for controlling the switching power supply to supply power to the LED display screen, and detecting overvoltage, overcurrent and overtemperature of the power supply of the LED display screen by controlling the power-on time sequence of the LED display screen.
The power supply management device, the switching power supply, the bus bar and the environment control module are also included; the power management equipment is used for providing power management for the vision computer, the video image processor, the optical transceiver and the video transmitter and realizing one-key power on and off, overvoltage, overload and short-circuit protection for video processing and transmission; the switching power supply is used for converting alternating-current high voltage into direct-current low voltage, transmitting the direct-current low voltage to the LED lamp panel and the video receiving card through the bus bar for power supply, and performing overload, overvoltage and overtemperature protection; the environment control module comprises a temperature acquisition sensor, a temperature controller and a heat dissipation fan, wherein the temperature acquisition sensor feeds back an acquired temperature value to the temperature controller, and the temperature controller adjusts the heat dissipation fan to dissipate heat according to the current spherical curtain environment temperature; when the ambient temperature exceeds the temperature threshold, the temperature controller sends a power-off command to the controller to carry out forced cooling, and when the temperature recovers the threshold range, the temperature controller sends a power-on starting command to the controller to recover the working state.
The video image processor is used for converting each channel image output by the view computer into a curved surface image and correcting dislocation and distortion of a connection part between the curved surface images.
The video image processor takes a field programmable logic gate array or an image processing chip as a core processor, the signals are decoded and controlled to input video signals to the field programmable logic gate array or the image processing chip in a parallel mode for processing, and a static random access memory chip is matched to enable hardware to correct geometric figures in real time.
The video image processor performs caching processing on the image by controlling the static random access memory chip, so that the video signal is not greater than 1 frame delay of the video stream; the video image processors are connected through coaxial cables, and the multichannel video images are synchronously output through controlling the horizontal field synchronous signals.
The video transmitter takes a field programmable gate array or a graphic processing chip as a core processor and is used for video signal interface conversion and LED screen control command transmission.
The video transmitter receives self-checking information from the video receiving card, is used for monitoring the state of the LED lamp panel, feeds the monitoring information back to the controller, and is used for monitoring and controlling the display state of the ball screen.
The optical transceiver comprises an optical transmitter and an optical receiver, wherein the optical transmitter is used for converting a video signal into an optical signal and transmitting the video signal from a cabinet end to a dome screen end through an optical fiber; the optical receiver is used for receiving the optical signal sent from the cabinet end to the spherical screen end and converting the optical signal into a digital video signal again.
The video receiving card is used for receiving video information, intercepting video signals in a display area to drive the LED lamp panel, and a control instruction of a video image is from the video transmitter and stored in the flash memory chip; the video receiving card takes a field programmable gate array or an image processing chip as a core processor and is matched with a dynamic random access memory chip to realize image caching and processing, and a video signal is not more than 2-frame delay of a video stream; the LED lamp panel state monitoring system is used for monitoring the LED lamp panel state information and reporting the information to the video transmitter.
The controller receives monitoring information from the video transmitter, is used for monitoring and controlling the working state of the LED display screen, positions abnormal points and is used for color space management, brightness adjustment and state monitoring of the LED display screen.
The beneficial effects of the invention are mainly shown in the following aspects:
the invention adopts an LED display technology to replace the original projector display technology, and consists of three modules of image processing, video transmission and LED display; the LED display is active display, and has higher display brightness and contrast than a passive display mode of a projector, and a single LED lamp bead is an image pixel, the pixels are distributed at equal intervals along the longitude and latitude of a spherical surface, the display pixels are uniformly distributed, and secondary correction of brightness and color is not needed; the LED belongs to a semiconductor light-emitting device, has higher response speed and longer service life, displays have higher response speed, and displays have longer service life; the display frames of the LED spherical screen display screen are spliced into a whole through pixels, and the problem of a public pixel band does not exist, so that the image processing only needs geometric correction from a plane to a spherical surface, image fusion at the edge and consistency correction of brightness and color are not needed, the image processing step is simpler and more convenient, and the maintenance cost is low; due to the fact that the common band problem does not exist, the pixel utilization rate of each channel can reach more than 90% through reasonable channel division.
The invention adopts the video image processor to carry out hardware-level geometric correction on the video image, thereby saving the steps of image fusion, brightness and color consistency correction and the like in a projection spherical screen display system and enabling the display control to be simpler and more convenient; meanwhile, the video image is processed by adopting hardware based on a field programmable gate array or an image processing chip, so that the dependence on a scene computer and scene software is reduced, the system has higher flexibility and better compatibility, and the traditional projection spherical screen display terminal can be directly replaced under the condition of not changing the scene computer and the scene software.
According to the invention, the correction parameters of the video image processor are firstly adjusted and then solidified in the flash memory chip of the video transmitter or the video receiving card, secondary correction is not needed after the LED lamp panel is replaced at the later stage, and the correction parameters of the display area can be reused, so that the display control process is simplified, and the debugging and maintenance cost is reduced.
And fourthly, the optical transceiver is adopted to carry out long-distance video transmission, so that on one hand, zero-delay and stable transmission of high-definition video can be realized, on the other hand, system wiring is simplified, and the reliability of the system is improved.
And fifthly, the video transmitter is adopted for display control, so that the multichannel video signals transmitted from the front end can be synchronized, the video images can be subjected to drive distribution management, display picture brightness and color management and display pixel space coordinate mapping management, and the normal display of the visual LED dome screen is finally realized.
The video image processor, the video transmitter and the video receiving card are all processed in real time on the basis of field programmable logic gate array or graphic processing chip hardware, and the real-time performance is strong.
The invention adopts the power management equipment to realize one-key startup and shutdown, overvoltage, overload and short-circuit protection on the vision computer, the optical transceiver and the video transmitter, simplifies the operation steps by unified power management, and improves the stability and reliability of the system.
According to the invention, the controller is adopted to carry out unified management and automatic control on the switch power supply, and the power supply on-off of the LED lamp panel is controlled by monitoring the overvoltage, overcurrent and overtemperature of the switch power supply. Meanwhile, the environment control module monitors the temperature of the system and feeds data back to the controller, when the temperature exceeds a set threshold value, the LED lamp panel is turned off and cooled according to the region, when the temperature returns to a normal temperature range, the power supply can be restarted to drive the LED lamp panel in the region, and finally intelligent management of power supply of the LED lamp panel is achieved.
Drawings
The invention will be further described in detail with reference to the drawings and the detailed description, in which:
FIG. 1 is a block diagram of the system of the present invention.
Detailed Description
Example 1
Referring to fig. 1, an LED display control system includes a driving power supply, and further includes a vision computer, a video image processor, an optical transceiver, a video transmitter, a video receiving card, and a controller electrically connected; the vision computer adopts a graphic workstation and is used for synchronously outputting video images applied by a plurality of channels; the video image processor is used for realizing pixel-level geometric correction and image cropping of the application video image; the optical transceiver adopts a hardware conversion chip to convert electricity and light and is used for long-distance real-time transmission of high-definition video; the video transmitter is used for performing interface conversion on the digital video signal and transmitting the digital video signal to the spherical screen display terminal through the gigabit Ethernet; the video receiving cards are distributed discretely along with the LED lamp panels and are connected in series through gigabit Ethernet to receive video data sent by the video transmitter, and the video receiving cards are connected with the LED lamp panels and transmit the data in a parallel port mode; the controller is used for controlling the switching power supply to supply power to the LED display screen, and detecting overvoltage, overcurrent and overtemperature of the power supply of the LED display screen by controlling the power-on time sequence of the LED display screen.
The embodiment is the most basic implementation mode, adopts the LED display technology to replace the original projector display technology, and consists of three modules of image processing, video transmission and LED display; the LED display is active display, and has higher display brightness and contrast than a passive display mode of a projector, and a single LED lamp bead is an image pixel, the pixels are distributed at equal intervals along the longitude and latitude of a spherical surface, the display pixels are uniformly distributed, and secondary correction of brightness and color is not needed; the LED belongs to a semiconductor light-emitting device, has higher response speed and longer service life, displays have higher response speed, and displays have longer service life; the display frames of the LED spherical screen display screen are spliced into a whole through pixels, and the problem of a public pixel band does not exist, so that the image processing only needs geometric correction from a plane to a spherical surface, image fusion at the edge and consistency correction of brightness and color are not needed, the image processing step is simpler and more convenient, and the maintenance cost is low; due to the fact that the common band problem does not exist, the pixel utilization rate of each channel can reach more than 90% through reasonable channel division.
Example 2
Referring to fig. 1, an LED display control system includes a driving power supply, and further includes a vision computer, a video image processor, an optical transceiver, a video transmitter, a video receiving card, and a controller electrically connected; the vision computer adopts a graphic workstation and is used for synchronously outputting video images applied by a plurality of channels; the video image processor is used for realizing pixel-level geometric correction and image cropping of the application video image; the optical transceiver adopts a hardware conversion chip to convert electricity and light and is used for long-distance real-time transmission of high-definition video; the video transmitter is used for performing interface conversion on the digital video signal and transmitting the digital video signal to the spherical screen display terminal through the gigabit Ethernet; the video receiving cards are distributed discretely along with the LED lamp panels and are connected in series through gigabit Ethernet to receive video data sent by the video transmitter, and the video receiving cards are connected with the LED lamp panels and transmit the data in a parallel port mode; the controller is used for controlling the switching power supply to supply power to the LED display screen, and detecting overvoltage, overcurrent and overtemperature of the power supply of the LED display screen by controlling the power-on time sequence of the LED display screen.
The power supply management device, the switching power supply, the bus bar and the environment control module are also included; the power management equipment is used for providing power management for the vision computer, the video image processor, the optical transceiver and the video transmitter and realizing one-key power on and off, overvoltage, overload and short-circuit protection for video processing and transmission; the switching power supply is used for converting alternating-current high voltage into direct-current low voltage, transmitting the direct-current low voltage to the LED lamp panel and the video receiving card through the bus bar for power supply, and performing overload, overvoltage and overtemperature protection; the environment control module comprises a temperature acquisition sensor, a temperature controller and a heat dissipation fan, wherein the temperature acquisition sensor feeds back an acquired temperature value to the temperature controller, and the temperature controller adjusts the heat dissipation fan to dissipate heat according to the current spherical curtain environment temperature; when the ambient temperature exceeds the temperature threshold, the temperature controller sends a power-off command to the controller to carry out forced cooling, and when the temperature recovers the threshold range, the temperature controller sends a power-on starting command to the controller to recover the working state.
The embodiment is a better implementation mode, a video image processor is adopted to carry out hardware-level geometric correction on a video image, so that the steps of image fusion, brightness and color consistency correction and the like in a projection spherical screen display system are omitted, and the display control is simpler and more convenient; meanwhile, the video image is processed by adopting hardware based on a field programmable gate array or an image processing chip, so that the dependence on a scene computer and scene software is reduced, the system has higher flexibility and better compatibility, and the traditional projection spherical screen display terminal can be directly replaced under the condition of not changing the scene computer and the scene software.
Example 3
Referring to fig. 1, an LED display control system includes a driving power supply, and further includes a vision computer, a video image processor, an optical transceiver, a video transmitter, a video receiving card, and a controller electrically connected; the vision computer adopts a graphic workstation and is used for synchronously outputting video images applied by a plurality of channels; the video image processor is used for realizing pixel-level geometric correction and image cropping of the application video image; the optical transceiver adopts a hardware conversion chip to convert electricity and light and is used for long-distance real-time transmission of high-definition video; the video transmitter is used for performing interface conversion on the digital video signal and transmitting the digital video signal to the spherical screen display terminal through the gigabit Ethernet; the video receiving cards are distributed discretely along with the LED lamp panels and are connected in series through gigabit Ethernet to receive video data sent by the video transmitter, and the video receiving cards are connected with the LED lamp panels and transmit the data in a parallel port mode; the controller is used for controlling the switching power supply to supply power to the LED display screen, and detecting overvoltage, overcurrent and overtemperature of the power supply of the LED display screen by controlling the power-on time sequence of the LED display screen.
The power supply management device, the switching power supply, the bus bar and the environment control module are also included; the power management equipment is used for providing power management for the vision computer, the video image processor, the optical transceiver and the video transmitter and realizing one-key power on and off, overvoltage, overload and short-circuit protection for video processing and transmission; the switching power supply is used for converting alternating-current high voltage into direct-current low voltage, transmitting the direct-current low voltage to the LED lamp panel and the video receiving card through the bus bar for power supply, and performing overload, overvoltage and overtemperature protection; the environment control module comprises a temperature acquisition sensor, a temperature controller and a heat dissipation fan, wherein the temperature acquisition sensor feeds back an acquired temperature value to the temperature controller, and the temperature controller adjusts the heat dissipation fan to dissipate heat according to the current spherical curtain environment temperature; when the ambient temperature exceeds the temperature threshold, the temperature controller sends a power-off command to the controller to carry out forced cooling, and when the temperature recovers the threshold range, the temperature controller sends a power-on starting command to the controller to recover the working state.
The video image processor is used for converting each channel image output by the view computer into a curved surface image and correcting dislocation and distortion of a connection part between the curved surface images.
The video image processor takes a field programmable logic gate array or an image processing chip as a core processor, the signals are decoded and controlled to input video signals to the field programmable logic gate array or the image processing chip in a parallel mode for processing, and a static random access memory chip is matched to enable hardware to correct geometric figures in real time.
In another preferred embodiment, the correction parameters of the video image processor are first adjusted and then fixed in the flash memory chip of the video transmitter or the video receiving card, and the LED lamp panel does not need to be corrected for the second time after being replaced in the later period.
Example 4
Referring to fig. 1, an LED display control system includes a driving power supply, and further includes a vision computer, a video image processor, an optical transceiver, a video transmitter, a video receiving card, and a controller electrically connected; the vision computer adopts a graphic workstation and is used for synchronously outputting video images applied by a plurality of channels; the video image processor is used for realizing pixel-level geometric correction and image cropping of the application video image; the optical transceiver adopts a hardware conversion chip to convert electricity and light and is used for long-distance real-time transmission of high-definition video; the video transmitter is used for performing interface conversion on the digital video signal and transmitting the digital video signal to the spherical screen display terminal through the gigabit Ethernet; the video receiving cards are distributed discretely along with the LED lamp panels and are connected in series through gigabit Ethernet to receive video data sent by the video transmitter, and the video receiving cards are connected with the LED lamp panels and transmit the data in a parallel port mode; the controller is used for controlling the switching power supply to supply power to the LED display screen, and detecting overvoltage, overcurrent and overtemperature of the power supply of the LED display screen by controlling the power-on time sequence of the LED display screen.
The power supply management device, the switching power supply, the bus bar and the environment control module are also included; the power management equipment is used for providing power management for the vision computer, the video image processor, the optical transceiver and the video transmitter and realizing one-key power on and off, overvoltage, overload and short-circuit protection for video processing and transmission; the switching power supply is used for converting alternating-current high voltage into direct-current low voltage, transmitting the direct-current low voltage to the LED lamp panel and the video receiving card through the bus bar for power supply, and performing overload, overvoltage and overtemperature protection; the environment control module comprises a temperature acquisition sensor, a temperature controller and a heat dissipation fan, wherein the temperature acquisition sensor feeds back an acquired temperature value to the temperature controller, and the temperature controller adjusts the heat dissipation fan to dissipate heat according to the current spherical curtain environment temperature; when the ambient temperature exceeds the temperature threshold, the temperature controller sends a power-off command to the controller to carry out forced cooling, and when the temperature recovers the threshold range, the temperature controller sends a power-on starting command to the controller to recover the working state.
The video image processor is used for converting each channel image output by the view computer into a curved surface image and correcting dislocation and distortion of a connection part between the curved surface images.
The video image processor takes a field programmable logic gate array or an image processing chip as a core processor, the signals are decoded and controlled to input video signals to the field programmable logic gate array or the image processing chip in a parallel mode for processing, and a static random access memory chip is matched to enable hardware to correct geometric figures in real time.
The video image processor performs caching processing on the image by controlling the static random access memory chip, so that the video signal is not greater than 1 frame delay of the video stream; the video image processors are connected through coaxial cables, and the multichannel video images are synchronously output through controlling the horizontal field synchronous signals.
The video transmitter takes a field programmable gate array or a graphic processing chip as a core processor and is used for video signal interface conversion and LED screen control command transmission.
In this embodiment, an optical transceiver is used for long-distance video transmission, which can realize zero-delay and stable transmission of high-definition video, simplify system wiring, and improve system reliability.
The video transmitter is adopted for display control, multi-channel video signals transmitted from the front end can be synchronized, driving distribution management, display picture brightness and color management and display pixel space coordinate mapping management can be carried out on video images, and normal display of the visual LED spherical screen is finally achieved.
Example 5
Referring to fig. 1, an LED display control system includes a driving power supply, and further includes a vision computer, a video image processor, an optical transceiver, a video transmitter, a video receiving card, and a controller electrically connected; the vision computer adopts a graphic workstation and is used for synchronously outputting video images applied by a plurality of channels; the video image processor is used for realizing pixel-level geometric correction and image cropping of the application video image; the optical transceiver adopts a hardware conversion chip to convert electricity and light and is used for long-distance real-time transmission of high-definition video; the video transmitter is used for performing interface conversion on the digital video signal and transmitting the digital video signal to the spherical screen display terminal through the gigabit Ethernet; the video receiving cards are distributed discretely along with the LED lamp panels and are connected in series through gigabit Ethernet to receive video data sent by the video transmitter, and the video receiving cards are connected with the LED lamp panels and transmit the data in a parallel port mode; the controller is used for controlling the switching power supply to supply power to the LED display screen, and detecting overvoltage, overcurrent and overtemperature of the power supply of the LED display screen by controlling the power-on time sequence of the LED display screen.
The power supply management device, the switching power supply, the bus bar and the environment control module are also included; the power management equipment is used for providing power management for the vision computer, the video image processor, the optical transceiver and the video transmitter and realizing one-key power on and off, overvoltage, overload and short-circuit protection for video processing and transmission; the switching power supply is used for converting alternating-current high voltage into direct-current low voltage, transmitting the direct-current low voltage to the LED lamp panel and the video receiving card through the bus bar for power supply, and performing overload, overvoltage and overtemperature protection; the environment control module comprises a temperature acquisition sensor, a temperature controller and a heat dissipation fan, wherein the temperature acquisition sensor feeds back an acquired temperature value to the temperature controller, and the temperature controller adjusts the heat dissipation fan to dissipate heat according to the current spherical curtain environment temperature; when the ambient temperature exceeds the temperature threshold, the temperature controller sends a power-off command to the controller to carry out forced cooling, and when the temperature recovers the threshold range, the temperature controller sends a power-on starting command to the controller to recover the working state.
The video image processor is used for converting each channel image output by the view computer into a curved surface image and correcting dislocation and distortion of a connection part between the curved surface images.
The video image processor takes a field programmable logic gate array or an image processing chip as a core processor, the signals are decoded and controlled to input video signals to the field programmable logic gate array or the image processing chip in a parallel mode for processing, and a static random access memory chip is matched to enable hardware to correct geometric figures in real time.
The video image processor performs caching processing on the image by controlling the static random access memory chip, so that the video signal is not greater than 1 frame delay of the video stream; the video image processors are connected through coaxial cables, and the multichannel video images are synchronously output through controlling the horizontal field synchronous signals.
The video transmitter takes a field programmable gate array or a graphic processing chip as a core processor and is used for video signal interface conversion and LED screen control command transmission.
The video transmitter receives self-checking information from the video receiving card, is used for monitoring the state of the LED lamp panel, feeds the monitoring information back to the controller, and is used for monitoring and controlling the display state of the ball screen.
The optical transceiver comprises an optical transmitter and an optical receiver, wherein the optical transmitter is used for converting a video signal into an optical signal and transmitting the video signal from a cabinet end to a dome screen end through an optical fiber; the optical receiver is used for receiving the optical signal sent from the cabinet end to the spherical screen end and converting the optical signal into a digital video signal again.
In this embodiment, the video image processor, the video transmitter and the video receiving card are all based on the hardware real-time processing of the fpga or the gpu, and have high real-time performance.
Example 6
Referring to fig. 1, an LED display control system includes a driving power supply, and further includes a vision computer, a video image processor, an optical transceiver, a video transmitter, a video receiving card, and a controller electrically connected; the vision computer adopts a graphic workstation and is used for synchronously outputting video images applied by a plurality of channels; the video image processor is used for realizing pixel-level geometric correction and image cropping of the application video image; the optical transceiver adopts a hardware conversion chip to convert electricity and light and is used for long-distance real-time transmission of high-definition video; the video transmitter is used for performing interface conversion on the digital video signal and transmitting the digital video signal to the spherical screen display terminal through the gigabit Ethernet; the video receiving cards are distributed discretely along with the LED lamp panels and are connected in series through gigabit Ethernet to receive video data sent by the video transmitter, and the video receiving cards are connected with the LED lamp panels and transmit the data in a parallel port mode; the controller is used for controlling the switching power supply to supply power to the LED display screen, and detecting overvoltage, overcurrent and overtemperature of the power supply of the LED display screen by controlling the power-on time sequence of the LED display screen.
The power supply management device, the switching power supply, the bus bar and the environment control module are also included; the power management equipment is used for providing power management for the vision computer, the video image processor, the optical transceiver and the video transmitter and realizing one-key power on and off, overvoltage, overload and short-circuit protection for video processing and transmission; the switching power supply is used for converting alternating-current high voltage into direct-current low voltage, transmitting the direct-current low voltage to the LED lamp panel and the video receiving card through the bus bar for power supply, and performing overload, overvoltage and overtemperature protection; the environment control module comprises a temperature acquisition sensor, a temperature controller and a heat dissipation fan, wherein the temperature acquisition sensor feeds back an acquired temperature value to the temperature controller, and the temperature controller adjusts the heat dissipation fan to dissipate heat according to the current spherical curtain environment temperature; when the ambient temperature exceeds the temperature threshold, the temperature controller sends a power-off command to the controller to carry out forced cooling, and when the temperature recovers the threshold range, the temperature controller sends a power-on starting command to the controller to recover the working state.
The video image processor is used for converting each channel image output by the view computer into a curved surface image and correcting dislocation and distortion of a connection part between the curved surface images.
The video image processor takes a field programmable logic gate array or an image processing chip as a core processor, the signals are decoded and controlled to input video signals to the field programmable logic gate array or the image processing chip in a parallel mode for processing, and a static random access memory chip is matched to enable hardware to correct geometric figures in real time.
The video image processor performs caching processing on the image by controlling the static random access memory chip, so that the video signal is not greater than 1 frame delay of the video stream; the video image processors are connected through coaxial cables, and the multichannel video images are synchronously output through controlling the horizontal field synchronous signals.
The video transmitter takes a field programmable gate array or a graphic processing chip as a core processor and is used for video signal interface conversion and LED screen control command transmission.
The video transmitter receives self-checking information from the video receiving card, is used for monitoring the state of the LED lamp panel, feeds the monitoring information back to the controller, and is used for monitoring and controlling the display state of the ball screen.
The optical transceiver comprises an optical transmitter and an optical receiver, wherein the optical transmitter is used for converting a video signal into an optical signal and transmitting the video signal from a cabinet end to a dome screen end through an optical fiber; the optical receiver is used for receiving the optical signal sent from the cabinet end to the spherical screen end and converting the optical signal into a digital video signal again.
The video receiving card is used for receiving video information, intercepting video signals in a display area to drive the LED lamp panel, and a control instruction of a video image is from the video transmitter and stored in the flash memory chip; the video receiving card takes a field programmable gate array or an image processing chip as a core processor and is matched with a dynamic random access memory chip to realize image caching and processing, and a video signal is not more than 2-frame delay of a video stream; the LED lamp panel state monitoring system is used for monitoring the LED lamp panel state information and reporting the information to the video transmitter.
The controller receives monitoring information from the video transmitter, is used for monitoring and controlling the working state of the LED display screen, positions abnormal points and is used for color space management, brightness adjustment and state monitoring of the LED display screen.
The embodiment is the best implementation mode, the power management equipment is adopted to realize one-key startup and shutdown, overvoltage, overload and short-circuit protection on a vision computer, an optical transceiver and a video transmitter, the unified power management simplifies the operation steps and improves the stability and the reliability of the system.
The controller is adopted to carry out unified management and automatic control on the switch power supply, and the power supply on-off of the LED lamp panel is controlled by monitoring the overvoltage, overcurrent and overtemperature of the switch power supply. Meanwhile, the environment control module monitors the temperature of the system and feeds data back to the controller, when the temperature exceeds a set threshold value, the LED lamp panel is turned off and cooled according to the region, when the temperature returns to a normal temperature range, the power supply can be restarted to drive the LED lamp panel in the region, and finally intelligent management of power supply of the LED lamp panel is achieved.
Claims (8)
1. An LED display control system comprises a driving power supply, and is characterized in that: the system also comprises a vision computer, a video image processor, an optical transceiver, a video transmitter, a video receiving card and a controller which are electrically connected; the vision computer adopts a graphic workstation and is used for synchronously outputting video images applied by a plurality of channels; the video image processor is used for realizing pixel-level geometric correction and image cropping of the application video image; the optical transceiver adopts a hardware conversion chip to convert electricity and light and is used for long-distance real-time transmission of high-definition video; the video transmitter is used for performing interface conversion on the digital video signal and transmitting the digital video signal to the spherical screen display terminal through the gigabit Ethernet; the video receiving cards are distributed discretely along with the LED lamp panels and are connected in series through gigabit Ethernet to receive video data sent by the video transmitter, and the video receiving cards are connected with the LED lamp panels and transmit the data in a parallel port mode; the controller is used for controlling the switching power supply to supply power to the LED display screen, and detecting overvoltage, overcurrent and overtemperature of the power supply of the LED display screen by controlling the power-on time sequence of the LED display screen; the video receiving card is used for receiving video information, intercepting video signals in a display area to drive the LED lamp panel, and a control instruction of a video image is from the video transmitter and stored in the flash memory chip; the video receiving card takes a field programmable gate array or an image processing chip as a core processor and is matched with a dynamic random access memory chip to realize image caching and processing, and a video signal is not more than 2-frame delay of a video stream; the LED lamp panel state monitoring system is used for monitoring the state information of the LED lamp panel and reporting the state information to the video transmitter; the controller receives monitoring information from the video transmitter, is used for monitoring and controlling the working state of the LED display screen, positions abnormal points and is used for color space management, brightness adjustment and state monitoring of the LED display screen.
2. The LED display control system of claim 1, wherein: the power supply management device, the switching power supply, the bus bar and the environment control module are also included; the power management equipment is used for providing power management for the vision computer, the video image processor, the optical transceiver and the video transmitter and realizing one-key power on and off, overvoltage, overload and short-circuit protection for video processing and transmission; the switching power supply is used for converting alternating-current high voltage into direct-current low voltage, transmitting the direct-current low voltage to the LED lamp panel and the video receiving card through the bus bar for power supply, and performing overload, overvoltage and overtemperature protection; the environment control module comprises a temperature acquisition sensor, a temperature controller and a heat dissipation fan, wherein the temperature acquisition sensor feeds back an acquired temperature value to the temperature controller, and the temperature controller adjusts the heat dissipation fan to dissipate heat according to the current spherical curtain environment temperature; when the ambient temperature exceeds the temperature threshold, the temperature controller sends a power-off command to the controller to carry out forced cooling, and when the temperature recovers the threshold range, the temperature controller sends a power-on starting command to the controller to recover the working state.
3. The LED display control system of claim 1, wherein: the video image processor is used for converting each channel image output by the view computer into a curved surface image and correcting dislocation and distortion of a connection part between the curved surface images.
4. The LED display control system of claim 1, wherein: the video image processor takes a field programmable logic gate array or an image processing chip as a core processor, the signals are decoded and controlled to input video signals to the field programmable logic gate array or the image processing chip in a parallel mode for processing, and a static random access memory chip is matched to enable hardware to correct geometric figures in real time.
5. The LED display control system of claim 1, wherein: the video image processor performs caching processing on the image by controlling the static random access memory chip, so that the video signal is not greater than 1 frame delay of the video stream; the video image processors are connected through coaxial cables, and the multichannel video images are synchronously output through controlling the horizontal field synchronous signals.
6. The LED display control system of claim 1, wherein: the video transmitter takes a field programmable gate array or a graphic processing chip as a core processor and is used for video signal interface conversion and LED screen control command transmission.
7. The LED display control system of claim 1, wherein: the video transmitter receives self-checking information from the video receiving card, is used for monitoring the state of the LED lamp panel, feeds the monitoring information back to the controller, and is used for monitoring and controlling the display state of the ball screen.
8. The LED display control system of claim 1, wherein: the optical transceiver comprises an optical transmitter and an optical receiver, wherein the optical transmitter is used for converting a video signal into an optical signal and transmitting the video signal from a cabinet end to a dome screen end through an optical fiber; the optical receiver is used for receiving the optical signal sent from the cabinet end to the spherical screen end and converting the optical signal into a digital video signal again.
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| CN202011417554.3A CN112435627A (en) | 2020-12-07 | 2020-12-07 | LED display control system |
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| CN117557446A (en) * | 2023-11-24 | 2024-02-13 | 北京同步风云科技有限公司 | Ball curtain LED real-time image processing and software control method |
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