CN115206255A - Aviation display control system and method - Google Patents
Aviation display control system and method Download PDFInfo
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- 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
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- G09G3/36—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 by control of light from an independent source using liquid crystals
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- G09G2300/00—Aspects of the constitution of display devices
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Abstract
The embodiment of the invention provides an aviation display control system and method, and belongs to the technical field of aviation display. The system comprises: the control unit comprises a soft core module and a logic module which are respectively used for generating graphs and driving display; wherein the soft core module and the logic module are integrated in the same controller; the display unit is in communication connection with the control unit and is used for displaying corresponding graphs under the drive of the logic module; and the power supply unit is used for supplying power to the control unit and the display unit. According to the scheme of the invention, the ZYNQ FPGA is used as the control unit, so that the problems of large structural thickness and large operation power consumption of the conventional aviation display are solved.
Description
Technical Field
The invention relates to the technical field of aviation display, in particular to an aviation display control system and an aviation display control method.
Background
The aviation display or instrument generally comprises 3 parts, a power panel, a graphic panel and a front-end liquid crystal display module. The power panel carries out filtering, anti-surge and power secondary conversion processing on the airborne power; drawing various graphic interfaces or instrument panels by the graphic board; the front-end liquid crystal display module mainly realizes driving liquid crystal screen display and backlight adjustment. With the development of technology, airborne avionics systems are increasingly demanding on the size and power consumption of displays, and it is desirable to reduce the size, thickness and power consumption of displays as much as possible. The traditional display control system comprises a graph generation controller and a liquid crystal module controller, two parts of the system are mutually independent and need two circuit boards, the thickness of display is difficult to reduce in structural design, and similarly, circuit board devices are increased, and the power consumption of the circuit system is difficult to reduce. Therefore, the significant improvement of the structural thickness of the display is difficult to realize on the existing basis only by the technical upgrade of electronic components, because the lower limit of the thickness of the dual-circuit board structure in the existing structure is already determined, and the technical barrier of the dual-circuit board structure cannot be broken through, so that the structural thickness control and the operation power consumption control of the current aviation display cannot be broken through all the time. Aiming at the problems of large structural thickness and large operation power consumption of the conventional aviation display, a new aviation display control system needs to be created.
Disclosure of Invention
The invention aims to provide a control system and a control method for an aviation display, which are used for at least solving the problems of large structural thickness and large operation power consumption of the conventional aviation display.
To achieve the above object, a first aspect of the present invention provides an aviation display control system, the system comprising: the control unit comprises a soft core module and a logic module which are respectively used for generating graphs and driving display; wherein the soft core module and the logic module are integrated in the same controller; the display unit is in communication connection with the control unit and is used for displaying corresponding graphs under the drive of the logic module; and the power supply unit is used for supplying power to the control unit and the display unit.
Optionally, the system further includes: the storage unit is in communication connection with the control unit and is used for: the soft core module is used for carrying out drawing caching; and the logic module reads the image information obtained by drawing.
Optionally, the memory unit is a DDR3 memory; the logic module performs reading of the image information obtained by the drawing based on the VDMA.
Optionally, the soft core module and the logic module perform information interaction based on an AXI4_ Lite bus protocol.
Optionally, the logic module sends the collected key light guide plate information to the soft core module based on an AXI4_ Lite bus, and the soft core module switches a corresponding display picture based on the key light guide plate information; the soft core module sends display state requirement information to the logic module based on an AXI4_ Lite bus, and the logic module performs corresponding display driving based on the display state requirement information; wherein the display state requirement information at least comprises display contrast and display brightness.
Optionally, the display driver includes: one or more of picture display driving, backlight brightness adjustment and low-temperature heating control.
Optionally, the logic module includes: the analysis module is used for analyzing the read VDMA graph picture into a format required by the display unit and carrying out picture display driving; the EEPROM module is used for adjusting the backlight brightness; and the AD acquisition module is used for acquiring the ambient temperature of the display unit and triggering low-temperature heating control when the ambient temperature of the display unit is smaller than a preset temperature threshold value.
The second aspect of the present invention provides an aviation display control method, which is applied to the aviation display control system described above, and the method is executed by a control unit of the aviation display control system, and the method includes: responding to a picture display trigger signal of a user, and acquiring corresponding required picture information; drawing an image based on the required picture information, and performing display driving based on the drawn image; and the display unit performs corresponding picture display based on the display driving result.
Optionally, the control unit includes a soft core module and a logic module, which are respectively used for graphics generation and display driving; the soft core module and the logic module share one control circuit board; the driving for display based on the drawn image includes: the soft core module performs image drawing and caching based on the required picture information and transmits the drawn image information to the logic module; and the logic module analyzes the drawn image information and outputs an image format suitable for the display unit.
In another aspect, the present invention provides a computer-readable storage medium having instructions stored thereon, which when executed on a computer, cause the computer to perform the aviation display control method described above.
Through the technical scheme, the ZYNQ FPGA is used as the control unit, the control unit comprises a soft core module (PS) and a logic module (PL), the PS part can be used for generating graphs, and the PL part realizes the functions of liquid crystal driving and backlight regulation. The controller can be used for integrating a traditional display graphic board circuit and a driving circuit of a front-end liquid crystal display module, and functions of graphic drawing, liquid crystal screen driving, backlight adjustment and the like can be realized by using one controller. The problems of large structure thickness and large operation power consumption of the conventional aviation display are solved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
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The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a system block diagram of an aerial display control system provided in one embodiment of the present invention;
FIG. 2 is a diagram illustrating the communication relationship between PS and PL provided by one embodiment of the present invention;
FIG. 3 is a flowchart illustrating steps of a method for controlling an aerial display according to an embodiment of the present invention.
Description of the reference numerals
10-a control unit; 20-a display unit; 30-a power supply unit.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
The aviation display or instrument generally comprises 3 parts, a power panel, a graphic panel and a front-end liquid crystal display module. The power panel carries out filtering, anti-surge and power secondary conversion processing on the airborne power; drawing various graphic interfaces or instrument panels by the graphic board; the front-end liquid crystal display module mainly realizes driving liquid crystal screen display and backlight adjustment. With the development of technology, airborne avionics systems are increasingly demanding on the size and power consumption of displays, and it is desirable to reduce the size, thickness and power consumption of displays as much as possible. The traditional display control system comprises a graph generation controller and a liquid crystal module controller, two parts of the system are mutually independent and need two circuit boards, the thickness of display is difficult to reduce in structural design, and similarly, circuit board devices are increased, and the power consumption of the circuit system is difficult to reduce.
Therefore, the significant improvement of the structural thickness of the display is difficult to realize on the existing basis only by the technical upgrade of electronic components, because the lower limit of the thickness of the dual-circuit board structure in the existing structure is already determined, and the technical barrier of the dual-circuit board structure cannot be broken through, so that the structural thickness control and the operation power consumption control of the current aviation display cannot be broken through all the time. Based on the technical scheme, the invention provides a novel aviation display control system, and fundamentally solves the problems of large display structure thickness and large operation power consumption caused by double circuit boards. The graphic generation and the display drive which can be realized by two circuit boards are integrated into one control circuit board, and the structural thickness and the operation power consumption of the display are greatly reduced on the premise of reducing one whole circuit board.
The scheme of the invention utilizes a ZYNQ FPGA as a control unit 10, which comprises a soft core module (PS) and a logic module (PL), wherein the PS part can be used for generating graphs, and the PL part realizes the functions of liquid crystal driving and backlight regulation. The controller can be used for integrating a traditional display graphic board circuit and a driving circuit of a front-end liquid crystal display module, and functions of graphic drawing, liquid crystal screen driving, backlight adjustment and the like can be realized by using one controller. Based on the operation speed of ZYNQ, the display circuit control system provided by the invention is suitable for a display with small size (the resolution is lower than 1024 × 768 resolution) or large size, which has low requirement on the graphic refreshing speed.
Common DSP, ARM, powerPC, MIPS, FPGA and the like of a traditional embedded integrated circuit application level chip, and the FPGA has the advantages of good flexibility, rich resources and high (parallel) speed of repeated programming (programmability). In the past application, an ARM is often used as a main control in a scene, an FPGA is externally hung on a peripheral parallel RAM (random access memory) bus of the ARM, and the FPGA is used for carrying out high-speed data acquisition or operation, so that the ARM is widely applied to the industries of communication, medical electronics and the like. The ZYNQ series, the first extensible processing platform in the industry by saint corporation (Xilinx), is intended to provide the required processing and computational performance levels for high-end embedded applications such as video surveillance, driver assistance, and factory automation. The scheme of the invention just utilizes the 'extensible' characteristic, and in the system architecture, the extensibility means that the system design comprises a mechanism and an element (hook) which are extended/improved by a new function, and the system infrastructure does not need to be greatly modified. The good architecture reflects the design principle for realizing the purpose and also makes a development blueprint for possible construction work in the future. Based on the feature of "expandable", the solution of the present invention constructs two parts, namely a soft core module and a logic module, in the control unit 10, which are respectively used for graphics generation and display driving, so that the two parts share one control circuit board.
FIG. 1 is a system block diagram of an aerial display control system according to one embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides an aerial display control system, the system comprising: the control unit 10 comprises a soft core module and a logic module, which are respectively used for generating graphs and driving display; the soft core module and the logic module share one control circuit board; the display unit 20 is in communication connection with the control unit 10 and is used for displaying corresponding graphs under the driving of the logic module; a power supply unit 30 for supplying power to the control unit 10 and the display unit 20.
In the embodiment of the invention, the scheme of the invention provides a display control system integrating the graphic generation and the liquid crystal module driving, which takes a ZYNQ FPGA as a core controller and is matched with a peripheral driving circuit to realize the work of a display. The controller is used for realizing the graph generation and the liquid crystal display module driving control, the circuit design complexity is reduced, the product design thickness and volume are reduced, the product power consumption is reduced, and the product finished product is reduced.
In a possible implementation mode, the power supply unit filters the incoming line of the onboard 28V power supply, performs anti-surge treatment on the incoming line, generates a 5V stabilized power supply through the power supply module, and generates other secondary power supplies to supply power to the control system through the 5V stabilized power supply. The control system comprises a ZYNQ FPGA controller, a heating control circuit and a backlight dimming circuit, wherein a PS end of the FPGA controller is externally connected with two pieces of DDR3 memories, two pieces of QSPI FLASH, FPGA PL ends are externally connected with EEROMs, a PL end I/O port is externally connected with a key collection port, and a PL end and a PS end respectively externally expand 1 path of UART interfaces and are converted into RS232 serial ports through an RS232 level conversion circuit.
Preferably, the system further comprises: the storage unit is in communication connection with the control unit 10 and is used for: the soft core module is used for carrying out drawing caching; and the logic module reads the image information obtained by drawing.
In the embodiment of the invention, the PS terminal is programmed through C language, the DDR3 memory is used as canvas, the function operation of the drawing pixel point is realized by writing data into the memory, the change of the drawing pattern can be realized by controlling the address written into the memory, and the color of the pixel is controlled by controlling the size of the data value written into the memory. The DDR3 memory is distributed into a plurality of memory block spaces according to an AXI4 bus address, for example, the range of a BANK1 is mapped to be used as the size of a drawing space, a PL end reads the DDR3 memory through a VDMA IP check, a graphic data stream drawn in the BANK1 memory space by a PS end is read out to the PL end, and the PL end analyzes the data and then drives a display screen to display according to the time sequence of the display screen.
Preferably, the memory unit is a DDR3 memory; the logic module performs reading of the image information obtained by the drawing based on the VDMA.
In the embodiment of the invention, the VDMA is generated in the video path because the AXI _ stream protocol of the large data stream needs to be used, and the VDMA is equivalent to two-dimensional DMA. Compared with the DMA, the VDMA increases the functions of automatic circulation and automatic frame buffer switching, realizes that output data is not torn by ensuring that an image system has a plurality of frame buffers, and coordinates the input and output speed of images. The VDMA can support 32 frame buffers at most, and can automatically switch between the frame buffers and automatically avoid each other through configuration, thereby ensuring image stability. VDMA can well fit with ZYNQ internal architecture, and therefore development period can be shortened well. Since data access can be efficiently achieved by combining VDMA itself, VDMA is indispensable for a video processing system based on ZYNQ images.
In a possible implementation, two pieces of DDR3 memories are externally connected to the PS terminal to serve as a drawing cache, a drawn graph is written into the DDR3 memories and is input to the PL terminal through the VDMA IP, and the PL terminal analyzes a graph image output by the VDMA and converts the graph image into a format required by the liquid crystal display, which is generally in an RGB format or an LVDS format.
Preferably, the soft core module and the logic module perform information interaction based on an AXI4_ Lite bus protocol.
In the embodiment of the invention, the PS end is externally connected with a QSPI _0 storage curing program, the external QSPI _1 storage graphic character library, the general aviation instrument needs more character information, the FLASH storage space on the PS end chip is limited, and the FLASH storage character library information needs to be externally expanded. The PS end communicates with the PL through an AXI4_ Lite bus to open a memory space for data exchange, the PL end sends the collected key light guide plate information to the PS end, and the PS end switches corresponding display pictures. Similarly, the AXI4_ Lite bus PS terminal sends contrast and brightness control information to the PL terminal, and the PL terminal receives data to adjust the backlight brightness of the display and the contrast of the display screen.
In one possible implementation, as shown in fig. 2, the ps side performs data interaction with the PL through an AXI4_ Lite bus, which performs data interaction by reading and writing to the memory. The DDR3 memory is distributed into a plurality of memory block spaces according to the AXI4 bus address, wherein the memory block spaces comprise a BANK1, a BANK2 and a BANK3. The BANK2 is a data interaction mapping space allocated by an AXI4 bus, the PS end writes data into a BNAK2 memory, the PL end reads the data through an AXI4_ Lite bus, the PL end can write the data into the BANK2 memory in the same way, and the PS end directly reads the data corresponding to the address from the memory according to the address. Thus, the interaction between the PS end and the PL end is realized.
Preferably, the logic module sends the collected key light guide plate information to the soft core module based on an AXI4_ Lite bus, and the soft core module switches the corresponding display picture based on the key light guide plate information; the soft core module sends display state requirement information to the logic module based on an AXI4_ Lite bus, and the logic module performs corresponding display driving based on the display state requirement information; wherein the display state requirement information at least comprises display contrast and display brightness.
Preferably, the display driver includes: one or more of picture display driving, backlight brightness adjustment and low-temperature heating control.
Preferably, the logic module includes: an analyzing module, configured to analyze the read VDMA graph picture into a format required by the display unit 20, and perform picture display driving; the EEPROM module is used for adjusting the backlight brightness; and the AD acquisition module is used for acquiring the ambient temperature of the display unit 20 and triggering low-temperature heating control when the ambient temperature of the display unit 20 is less than a preset temperature threshold value.
In the embodiment of the invention, the PL end realizes the display drive of the liquid crystal screen, the backlight brightness adjustment, the low-temperature heating control and the like, the PL end is externally connected with an EEPROM as backlight brightness parameters, and a backlight drive circuit is controlled to lighten the backlight component by outputting PWM in a frequency modulation mode; the external AD acquisition circuit of PL end gathers LCD screen ambient temperature, makes heating glass temperature rise through output PWM control heating control circuit under the low temperature to it is normal to make the LCD screen show under the low temperature. The PL end receives a video stream input by the VDMA, and can directly output RGB signals according to the Vesa protocol standard through the I/O port to drive the interface to be a liquid crystal display screen of the RGB interface for displaying; if the screen interface is an LVDS interface, the PL terminal can perform parallel-serial conversion on the RGB signals analyzed by the VDMA by means of the characteristic of high running speed of the FPGA, and converts the RGB data into LVDS signals to drive the liquid crystal screen to display through the conversion of the data bits 7:1.
FIG. 3 is a flowchart of a method for controlling an aerial display according to an embodiment of the invention. As shown in fig. 3, an embodiment of the present invention provides an aviation display control method, including:
step S10: and responding to the picture display trigger signal of the user, and acquiring corresponding required picture information.
Step S20: and drawing an image based on the required picture information, and performing display driving based on the drawn image.
Specifically, the soft core module performs image rendering and caching based on the required picture information, and transmits rendered image information to the logic module; the logic module analyzes the drawn image information and outputs an image format adapted to the display unit 20.
In a possible implementation mode, a PS end is externally connected with a QSPI _0 storage curing program, an externally connected QSPI _1 storage graphic word stock, a general aviation instrument needs more character information, the FLASH storage space on a PS end chip is limited, and the FLASH storage word stock information needs to be externally expanded. The PS end communicates with the PL through an AXI4_ Lite bus to open a memory space for data exchange, the PL end sends the collected key light guide plate information to the PS end, and the PS end switches corresponding display pictures. Similarly, the PS end of the AXI4_ Lite bus sends contrast and brightness control information to the PL end, and the PL end receives data to adjust the backlight brightness of the display and the contrast of the display screen.
Step S30: the display unit 20 performs corresponding screen display based on the display driving result.
In the embodiment of the invention, the PS end of the control system is used for realizing the drawing function of the graphic board of the traditional display, and the PL end of the control system is used for realizing the driving function of the front-end liquid crystal display module of the traditional display. After the communication architecture between the PS end and the PL end is realized, the PS end and the PL end can be developed independently, so that a technician skilled in logic development can develop the logic of the PL end, and a technician skilled in SOC development can develop corresponding software functions at the PS end. Meanwhile, the technical scheme can realize the cooperative development of a liquid crystal module manufacturer and a display complete machine supplier, most display complete machine suppliers expect that software development functions such as graphic drawing and the like are developed by the liquid crystal module supplier, so that the liquid crystal module supplier can realize the driving technology of the liquid crystal module supplier at the front end of the liquid crystal module at the PL end through logic and then provide a comprehensive bit flow program to the PS end, the protection of independent intellectual property rights is realized, and the competitive advantage of products is ensured.
Furthermore, the scheme of the invention realizes the mutual cooperation development of the complete machine manufacturer of the display and the supplier of the liquid crystal display module, simultaneously can realize the protection of the intellectual property rights of respective core technologies due to the higher independence of PS and PL ends, and the control system based on the framework can improve the product competitiveness of the manufacturer of the liquid crystal display module and can occupy the market of the supplier of the graphic card. In the scheme of the invention, the graph is drawn at the PS terminal based on the SOC, compared with the graph drawing by using a pure FPGA or an FPGA + DSP framework, the method is simpler and more convenient, the programming is easier, and the product development time is reduced; meanwhile, compared with the mode that a CPU with an operating system uses QT or OPGL for drawing graphics, the mode has the advantages of simpler circuit, lower product power consumption and higher advantage.
The embodiment of the invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores instructions which when run on a computer, make the computer execute the aviation display control method.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. An aerial display control system, the system comprising:
the control unit comprises a soft core module and a logic module which are respectively used for generating graphs and driving display; wherein,
the soft core module and the logic module are integrated in the same controller;
the display unit is in communication connection with the control unit and is used for displaying corresponding graphs under the drive of the logic module;
and the power supply unit is used for supplying power to the control unit and the display unit.
2. The system of claim 1, further comprising:
the storage unit is in communication connection with the control unit and is used for:
the soft core module is used for carrying out drawing caching; and
and the logic module reads the image information obtained by drawing.
3. The system of claim 2, wherein the memory unit is a DDR3 memory;
the logic module performs reading of the image information obtained by the drawing based on the VDMA.
4. The system of claim 3, wherein the soft core module and the logic module interact information based on an AXI4_ Lite bus protocol.
5. The system according to claim 4, wherein the logic module sends the collected key light guide plate information to the soft core module based on an AXI4_ Lite bus, and the soft core module switches the corresponding display screen based on the key light guide plate information;
the soft core module sends display state requirement information to the logic module based on an AXI4_ Lite bus, and the logic module performs corresponding display driving based on the display state requirement information; wherein,
the display state requirement information at least comprises display contrast and display brightness.
6. The system of claim 5, wherein the display driver comprises:
one or more of picture display driving, backlight brightness adjustment and low-temperature heating control.
7. The system of claim 6, wherein the logic module comprises:
the analysis module is used for analyzing the read VDMA graph picture into a format required by the display unit and carrying out picture display driving;
the EEPROM module is used for adjusting the backlight brightness;
and the AD acquisition module is used for acquiring the ambient temperature of the display unit and triggering low-temperature heating control when the ambient temperature of the display unit is smaller than a preset temperature threshold value.
8. An aerial display control method applied to an aerial display control system as claimed in any one of claims 1 to 7, the method being performed by a control unit of the aerial display control system, the method comprising:
responding to a picture display trigger signal of a user, and acquiring corresponding required picture information;
drawing an image based on the required picture information, and performing display driving based on the drawn image;
and the display unit performs corresponding picture display based on the display driving result.
9. The method of claim 8, wherein the control unit comprises a soft core module and a logic module for graphics generation and display driving, respectively; wherein,
the soft core module and the logic module are integrated in the same controller;
the display driving based on the drawn image includes:
the soft core module performs image drawing and caching based on the required picture information and transmits the drawn image information to the logic module;
and the logic module analyzes the drawn image information and outputs an image format suitable for the display unit.
10. A computer readable storage medium having stored thereon instructions which, when executed on a computer, cause the computer to perform the aerial display control method of any one of claims 8 and 9.
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