CN109828733B - Method and computing device for respectively and independently displaying multiple display terminals - Google Patents
Method and computing device for respectively and independently displaying multiple display terminals Download PDFInfo
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
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Abstract
The invention discloses a method and computing equipment for respectively and independently displaying a plurality of display terminals, which are suitable for being executed in the computing equipment, wherein the method comprises the following steps: initializing a plurality of groups of attribute parameters, wherein each group of attribute parameters corresponds to one display port; setting the connection states of the display ports to be successful; and when the display terminal is detected to be accessed into the display port, updating the attribute parameters of the corresponding display port into the attribute parameters of the accessed display terminal.
Description
Technical Field
The invention relates to the technical field of computer software, in particular to a method and computing equipment for respectively and independently displaying a plurality of display terminals.
Background
At present, in the practical use process, the computer uses double screens or connects a plurality of screens to display scenes of different interfaces more and more. For example, in some large complex industrial control devices, multiple users are required to coordinate to control the operation of the devices, and thus, multiple display control terminals, i.e., a screen a, a screen B, and a screen c, are required, as shown in fig. 1, each operator has its own independent operation display and control interface, and can operate different functions of the devices simultaneously or independently. Under the condition that a plurality of operators operate simultaneously, the interactivity of the software interface application operation is ensured, and the display devices are not affected by each other.
In addition, in actual operation, there may be a need for switching modes between multiple screens. For example, two screens, i.e., screen a and screen B, are now in an extended mode, and it is now necessary to change screen B to a mirror image of screen a, and in the operation process of interface B, it is necessary that interface a cannot have any change or cannot sense the change of interface B, as shown in fig. 2, which requires that the video card driver supports a completely independent switching technical scheme.
However, the display control of the existing devices at present is performed in a cross manner or affected by each other, for example, after one of the display terminals is turned off, the system driver may detect that the display device is turned off to adjust the interface, and automatically compress the image on the turned-off or turned-off screen onto another normal screen, so as to affect the observation operation of the interface of the other terminal. The reason is that the general display card driver can automatically recognize the state of the external display terminal, and realize the automatic adjustment or adaptation of a plurality of screens.
In addition, in the existing video card driver, the size of the video memory space can be dynamically allocated according to the connection access state of the display screen, when the state of the external display terminal device changes, the driver can dynamically apply for the video memory space of the screen and switch to the default mode, and the driver needs to be reconfigured, including the processes of reinitialization and connection state change, so that the phenomenon of screen flicker can occur in the switching process. Through many times of experiments and tests, in the switching process, all screens flicker in a black screen mode within 2-3 seconds approximately, and then switching operation is successful, so that operation and observation of a plurality of screen interfaces can be influenced simultaneously, and each display terminal cannot run independently.
Disclosure of Invention
To this end, the present invention provides a method, a computing device, and a computer program product for independent display of a plurality of display terminals, respectively, in an attempt to solve or at least alleviate at least one of the problems identified above.
According to an aspect of the embodiments of the present invention, there is provided a method for displaying independently on a plurality of display terminals, adapted to be executed in a computing device, the method including:
initializing a plurality of groups of attribute parameters, wherein each group of attribute parameters corresponds to one display port;
setting the connection states of the display ports to be successful; and the number of the first and second groups,
and when the display terminal is detected to be accessed into the display port, updating the attribute parameters of the corresponding display port into the attribute parameters of the accessed display terminal.
Optionally, the method further comprises:
configuring at least one group of display parameters and allocating at least one video memory area;
determining target display parameters of the display terminal from at least one group of display parameters, and determining a target video memory area of the display terminal from at least one video memory area;
and displaying the image information on the display terminal according to the target display parameters and the target display memory area.
Optionally, the video memory area is a pre-divided designated video memory area.
Optionally, the size of the display memory area is determined according to a preset display resolution of the display terminal.
Optionally, the number of the display memory areas is determined according to a preset display mode of the display terminal.
Optionally, the display mode of the display terminal includes:
extended mode and/or mirrored mode.
Optionally, the method further comprises the step of:
and re-determining the target display parameters of the display terminal from the at least one group of display parameters, and re-determining the target video memory area of the display terminal from the at least one video memory area.
Optionally, the attribute parameters include:
extended display identification data EDID and display output port information.
According to another aspect of the embodiments of the present invention, there is provided a readable storage medium adapted to store one or more programs configured to execute, by a computing device, a method for a plurality of display terminals to respectively independently display according to an embodiment of the present invention.
According to still another aspect of an embodiment of the present invention, there is provided a computing device including: one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors to perform the method for displaying independently by the plurality of display terminals according to the embodiment of the present invention, respectively.
According to the method for respectively and independently displaying the plurality of display terminals, disclosed by the embodiment of the invention, the plurality of groups of attribute parameters are initialized, and the connection states of the plurality of display ports are all set to be successfully connected, so that for upper-layer application, the plurality of display terminals are always in the successfully connected state, and therefore, when the actual connection state of the display terminals is changed, the output pictures of all the display screens are not correspondingly changed, and the independent display of all the display terminals is realized.
Drawings
To the accomplishment of the foregoing and related ends, certain illustrative aspects are described herein in connection with the following description and the annexed drawings, which are indicative of various ways in which the principles disclosed herein may be practiced, and all aspects and equivalents thereof are intended to be within the scope of the claimed subject matter. The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description read in conjunction with the accompanying drawings. Throughout this disclosure, like reference numerals generally refer to like parts or elements.
Fig. 1 exemplarily illustrates a working scenario in which a multi-display terminal displays different contents;
FIG. 2 schematically illustrates an operation scenario in which one display terminal does not affect another display terminal when switching modes;
FIG. 3 schematically illustrates a block diagram of computing device 100;
FIG. 4 illustrates a flow diagram of a method 200 for displaying independently of each other a plurality of display terminals according to an embodiment of the present invention;
fig. 5 exemplarily shows a configuration structure of a display terminal according to one embodiment of the present invention;
FIG. 6 exemplarily shows a display effect diagram according to one embodiment of the invention;
fig. 7 exemplarily shows a display effect diagram according to still another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
FIG. 3 is a block diagram of an example computing device 100 arranged to implement a method for separate display of multiple display terminals according to the present invention. In a basic configuration 102, computing device 100 typically includes system memory 106 and one or more processors 104. A memory bus 108 may be used for communication between the processor 104 and the system memory 106.
Depending on the desired configuration, the processor 104 may be any type of processing, including but not limited to: the processor 104 may include one or more levels of cache, such as a level one cache 110 and a level two cache 112, a processor core 114, and registers 116. the example processor core 114 may include an Arithmetic Logic Unit (ALU), a Floating Point Unit (FPU), a digital signal processing core (DSP core), or any combination thereof.
Depending on the desired configuration, system memory 106 may be any type of memory, including but not limited to: volatile memory (such as RAM), non-volatile memory (such as ROM, flash memory, etc.), or any combination thereof. System memory 106 may include an operating system 120, one or more programs 122, and program data 124. In some implementations, the program 122 can be configured to execute instructions on an operating system by one or more processors 104 using program data 124.
Computing device 100 may also include an interface bus 140 that facilitates communication from various interface devices (e.g., output devices 142, peripheral interfaces 144, and communication devices 146) to the basic configuration 102 via the bus/interface controller 130. The example output device 142 includes a graphics processing unit 148 and an audio processing unit 150. They may be configured to facilitate communication with various external devices, such as a display terminal or speakers, via one or more a/V ports 152. Example peripheral interfaces 144 may include a serial interface controller 154 and a parallel interface controller 156, which may be configured to facilitate communication with external devices such as input devices (e.g., keyboard, mouse, pen, voice input device, touch input device) or other peripherals (e.g., printer, scanner, etc.) via one or more I/O ports 158. An example communication device 146 may include a network controller 160, which may be arranged to facilitate communications with one or more other computing devices 162 over a network communication link via one or more communication ports 164.
A network communication link may be one example of a communication medium. Communication media may typically be embodied by computer readable instructions, data structures, program modules, and may include any information delivery media, such as carrier waves or other transport mechanisms, in a modulated data signal. A "modulated data signal" may be a signal that has one or more of its data set or its changes made in such a manner as to encode information in the signal. By way of non-limiting example, communication media may include wired media such as a wired network or private-wired network, and various wireless media such as acoustic, Radio Frequency (RF), microwave, Infrared (IR), or other wireless media. The term computer readable media as used herein may include both storage media and communication media.
Computing device 100 may be implemented as part of a small-form factor portable (or mobile) electronic device such as a cellular telephone, a Personal Digital Assistant (PDA), a personal media player device, a wireless web-watch device, a personal headset device, an application specific device, or a hybrid device that include any of the above functions. Computing device 100 may also be implemented as a personal computer including both desktop and notebook computer configurations.
Wherein the one or more programs 122 of the computing device 100 include instructions for performing a method for independent display of a plurality of display terminals, respectively, in accordance with the present invention.
Fig. 4 illustrates a flow chart of a method 200 for multiple display terminals to independently display, respectively, according to one embodiment of the invention. As shown in fig. 4, a method 200 for displaying independently on a plurality of display terminals begins at step S201.
In step S201, a plurality of sets of attribute parameters are initialized, each set of attribute parameters corresponding to a display port. The display port is a port for connecting a display terminal and a computing device, and may be, for example, an HDMI, VGA, DVI port, or the like, but is not limited thereto. Those skilled in the art will appreciate that the display port may be fixedly disposed on the computing device, or the display port of the computing device may be dynamically expanded through an adapter, an expander, or other devices.
According to the embodiment of the present invention, the attribute parameter refers to an attribute parameter of the Display terminal, and includes Extended Display Identification Data (EDID) and Display output Port information of the Display terminal, where the Display output Port information includes DP interface Configuration Data (DPCD) or a High Definition Multimedia interface (HDMI Port) value. Since the connection state of the display terminal is still unknown during the initialization state, the default attribute parameters of the display terminal need to be loaded.
Subsequently, in step S202, the connection states of the plurality of displayports are each set to connection success. If the real connection state of the display terminal is reported to the system interface layer in real time, when the connection state of the display terminal changes (the display terminal which is successfully connected originally is disconnected, or the display terminal which is failed originally is restored to be connected originally), the system layer reallocates the video memory, configures the driving attribute of the video card, re-initializes and the like for the display terminal which is successfully connected currently, which affects the display pictures of the plurality of display terminals simultaneously, and causes that each display terminal cannot independently operate. Therefore, in the embodiment of the present invention, the connection states of the plurality of display ports are all set to be successfully connected, so that the upper layer system interface considers that the display terminal keeps normal connection, and actually, the upper port may have access to the display terminal or may not have access to the display terminal. The technology realizes independent operation of each display terminal, and the independent operation of each display terminal is not influenced by each other.
Subsequently, in step S203, when it is detected that the display terminal is accessed to the display port, the attribute parameter corresponding to the display port is updated to the attribute parameter of the accessed display terminal, so as to complete the correct configuration of the display terminal and implement the normal display function.
According to an embodiment of the present invention, the method further comprises the steps of: configuring at least one group of display parameters and allocating at least one video memory area; determining target display parameters of the display terminal from the at least one group of display parameters, and determining a target video memory area of the display terminal from the at least one video memory area; and displaying image information on the display terminal according to the target display parameters and the target display memory area. Wherein, the display parameter refers to crtc parameter, including line frequency, frame frequency, line retrace time, frame retrace time, etc.
In the embodiment of the present invention, the independent display function of each display terminal is realized by configuring crtc, attribute parameters, and a video memory area, for example, see fig. 5.
In the embodiment shown in fig. 5, at the driver layer, display parameters (crtc0/1/2) and a display memory area A, B, C corresponding to three independent displayports (Displayport outputs) are initialized, and each Displayport corresponds to one display terminal (screen-0/1/2). Since the connection state of the display terminal is still unknown during the initialization state, a default display terminal attribute parameter, such as an edid, dppd, or hdmi port value of the display terminal, needs to be preset. And preferentially using the read display terminal attribute, and using a default attribute if the reading is unsuccessful. However, when reporting the terminal connection state to the upper system, it is necessary to set all the states to the state in which the connection is successful.
According to one embodiment of the invention, the video memory area is a designated video memory area which is divided in advance, wherein the size of the video memory area is determined according to a preset display resolution of the display terminal, and the number of the video memory areas is determined according to a preset display mode of the display terminal. According to the preset requirement, the display memory space of a plurality of independent display areas is pre-distributed in the kernel drive by integrating the consideration of the screen access number and the resolution. For example, if 3 independent interfaces are required and the resolution is 1280x1024@32bit, it is calculated that the video memory space occupied by each screen is 5MB, and 3 independent video memory areas (A, B, C) need to be allocated in advance, as shown in fig. 5.
In a specific implementation process, the number of the video memory areas is not necessarily equal to the number of the display terminals, for example, if a part of the display terminals are set to fixedly use the same mirror mode, the part of the display terminals do not need to additionally divide the video memory areas. Optionally, according to a display mode of the display terminal: and expanding the mode and/or the mirror image mode, and determining the number of the video memory areas.
In addition, the video memory area is divided in advance and configured to the display terminal, so that the problem of black screen caused by configuration processes such as temporary application of the video memory area, re-initialization and the like in the initialization process can be solved.
According to an embodiment of the present invention, when the display terminal needs to be replaced during the operation of the display system, the target display parameter of the display terminal is determined again from the at least one group of display parameters, and the target video memory area of the display terminal is determined again from the at least one video memory area. After the display terminal is disconnected and before a new display terminal is accessed, the drive always feeds back the connection state of the display terminal to the system layer as successful connection; after the new display terminal is accessed, the driver writes in the attribute parameters of the new display terminal and allocates the video memory area, so that the initialization work for the new display terminal is not needed, the video memory area is not required to be reapplied, and the phenomenon of black screen can be avoided.
According to one embodiment of the invention, when the display mode of the display terminal needs to be modified in the operation process of the display system, the configured video memory area can be directly modified. In other words, in the configuration information, the port connected with the display terminal is mapped to the corresponding display memory area, so that the change of the display mode is realized. The operation process does not have any influence on other display terminals, so that independent operation of each display terminal is realized.
To further illustrate the present invention, an example of an engineering implementation is given below in conjunction with fig. 5:
the configuration is performed by the parameters in the crtc structure attribute, and the final parameters are written into the control register of the display driver. In the driver of xserver, it can be configured as follows:
crtc0->vmem_start＝0M/5M/10M；
output->crtc＝crtc0；
wherein, three groups of video memory area A/B/C, CRTC [0/1/2] and screen [0/1/2] can be freely combined with each other.
Assuming that the video memory regions, CRTC and screen are matched one by one in the order from left to right, the display effect is as shown in fig. 6; then, when the following configuration combination is adjusted, the display effect is as shown in fig. 7:
the display terminal screen0 uses the configuration of CRTC-1, and the video memory area is C;
the display terminal screen1 uses the configuration of CRTC-0, and the video memory area is B;
and the display terminal screen2 uses the configuration of CRTC-2, and the video memory area is C.
In the experiment, after the configuration is completed, even if a certain screen is turned off or removed, the display mode states of the three screens remain unchanged. Viewed using the xrandr command, the states of the three screens displayed remain unchanged, and the connection states of the three display terminals are connected. After shutdown and restart, or three screens are closed and opened, the screen interface always keeps normal operation, and the application interface can also be started normally.
The invention provides a method for respectively and independently displaying a plurality of display terminals, which ensures that a plurality of screens can be independently operated without influencing each other, and does not influence other display terminals in the process of switching display modes of a single display terminal. And, in case that the display terminal is not connected, the driver ensures normal operation of the system application program by feeding back a state of successful connection of the display terminal to the application.
It should be understood that the various techniques described herein may be implemented in connection with hardware or software or, alternatively, with a combination of both. Thus, the methods and apparatus of the present invention, or certain aspects or portions thereof, may take the form of program code (i.e., instructions) embodied in tangible media, such as floppy diskettes, CD-ROMs, hard drives, or any other machine-readable storage medium, wherein, when the program is loaded into and executed by a machine, such as a computer, the machine becomes an apparatus for practicing the invention.
In the case of program code execution on programmable computers, the computing device will generally include a processor, a storage medium readable by the processor (including volatile and non-volatile memory and/or storage elements), at least one input device, and at least one output device. Wherein the memory is configured to store program code; the processor is configured to perform the various methods of the present invention according to instructions in the program code stored in the memory.
By way of example, and not limitation, computer readable media may comprise computer storage media and communication media. Computer-readable media includes both computer storage media and communication media. Computer storage media store information such as computer readable instructions, data structures, program modules or other data. Communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. Combinations of any of the above are also included within the scope of computer readable media.
It should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into multiple sub-modules.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
Furthermore, some of the described embodiments are described herein as a method or combination of method elements that can be performed by a processor of a computer system or by other means of performing the described functions. A processor having the necessary instructions for carrying out the method or method elements thus forms a means for carrying out the method or method elements. Further, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is used to implement the functions performed by the elements for the purpose of carrying out the invention.
As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.
Claims (8)
1. A method for independent display of a plurality of display terminals, respectively, adapted to be executed in a computing device, the method comprising:
initializing a plurality of groups of attribute parameters, wherein each group of attribute parameters corresponds to one display port;
setting the connection states of the display ports to be successful;
when the display terminal is detected to be accessed into the display port, updating the attribute parameters of the corresponding display port into the attribute parameters of the accessed display terminal;
configuring at least one group of display parameters and allocating at least one video memory area;
determining target display parameters of the display terminal from the at least one group of display parameters, and determining a target video memory area of the display terminal from the at least one video memory area;
displaying image information on the display terminal according to the target display parameters and the target display memory area;
the video memory area is a pre-divided designated video memory area.
2. The method as claimed in claim 1, wherein the size of the video memory area is determined according to a preset display resolution of the display terminal.
3. The method of claim 1, wherein the number of the video memory areas is determined according to a preset display mode of the display terminal.
4. The method of claim 3, wherein the displaying mode of the display terminal comprises:
extended mode and/or mirrored mode.
5. The method of claim 1, further comprising the steps of:
and re-determining the target display parameters of the display terminal from the at least one group of display parameters, and re-determining the target video memory area of the display terminal from the at least one video memory area.
6. The method of claim 1, wherein the attribute parameters comprise:
extended display identification data EDID and display output port information.
7. A readable storage medium adapted to store one or more programs configured to execute, by a computing device, the method of the respective independent display of the plurality of display terminals according to any one of claims 1 to 6.
8. A computing device, comprising:
one or more processors;
a memory; and
one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors to perform the method of independent display by each of the plurality of display terminals according to any one of claims 1-6.
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| CN202210023437.1A CN114546312B (en) | 2019-01-07 | 2019-01-07 | Method and computing device for respectively and independently displaying multiple display terminals |
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| CN113347382A (en) * | 2021-05-26 | 2021-09-03 | 随锐科技集团股份有限公司 | Display method, embedded terminal and computer readable storage medium |
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| CN114546312A (en) | 2022-05-27 |
| CN114546312B (en) | 2023-09-12 |
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