CN111399791A - Electronic blackboard-writing multi-screen display system and method based on same PC - Google Patents
Electronic blackboard-writing multi-screen display system and method based on same PC Download PDFInfo
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Abstract
The invention relates to a multi-screen display technology of computer screen display signals, and discloses an electronic blackboard-writing multi-screen display system and method based on the same PC, which solve the problems of complex operation and easy influence of the resolution of a display screen after the working mode is switched in a multi-screen display scheme in the traditional technology, realize double-screen or multi-screen copy display and asynchronous display in a PC extended display mode, meet the requirement of differential display, and solve the problems of low teaching efficiency and high cost in a double-all-in-one machine scheme. The operating system based on the same PC works in a double-large-screen or large-screen expansion display mode, the content of the blackboard-writing software on the main screen is copied, or the content of the front page is expanded and displayed, or the content of the specified page is expanded and displayed on other expansion screens, and the scheme is suitable for application scenes of multi-screen teaching, office meetings, training speeches and the like.
Description
Technical Field
The invention relates to a multi-screen display technology for displaying signals on a computer screen, in particular to a multi-screen display system and a multi-screen display method for an electronic blackboard-writing based on the same PC, which are suitable for application scenes such as multi-screen teaching, office meetings, training speeches and the like.
Background
At present, in scenes such as teaching, office meetings, training lectures and the like, a single large-screen display scheme is mostly used, namely, only one host and one large-screen display screen are provided, or a touch screen integrated machine is adopted to realize content display; this single-screen display scheme has certain drawbacks: firstly, for an application scene with a large space, a person far away from a screen may not clearly view screen display contents due to a viewing angle in a single-screen display; secondly, the single-screen display cannot meet the display requirements of multiple pieces of content, such as: in a teaching scene, the problem solving derivation of a teacher on teaching contents is often solved by a large electronic blackboard book, the teacher needs to continuously write in a new layout after writing a screen, the originally written contents need to be left for students to take notes and review front and back logics and need to be displayed on the screen all the time, and the single-screen display cannot meet the requirement.
In the prior art, there are also some implementations of multi-screen display, and there are two general approaches:
the integrated touch screen display device is hung on a wall by adopting two integrated touch screen machines, one of the two integrated touch screen machines is used as an expanded display screen of the other integrated touch screen machine, and writing and control are carried out on the touch screen of the integrated touch screen machine.
This solution has the following drawbacks: when an instructor needs to operate and control the all-in-one machines during explanation, the instructor needs to walk back and forth between the two all-in-one machines, and the teaching efficiency is not high; in addition, the cost is higher by adopting two all-in-one machines.
Secondly, a multi-screen display output scheme based on the same computer:
a computer is connected with two or more than two display screens through an output interface, and the display screens have two working modes:
(1) copy display mode: the image display signals output to all the screens are the same, and the display contents are duplicated among the screens.
(2) An extended display mode: the display signals of each screen connected through the computer output interface are different, namely, the display signals are independently displayed; one of the screens is a main screen of the computer, and the other screens are extended screens; an object (picture, window, etc.) in the home screen can be moved by the mouse to any one of the screens in the extended mode, i.e., the window or object can be moved between the screens.
The realization of the scheme requires that a user switches in the display mode of the operating system of the computer to obtain the required display mode and content, and the phenomena of inconsistent proportion, fuzzy display and the like caused by the influence of the resolution of the display screen are easily generated after the switching. Since many users are not familiar with operating system settings, this function is often idle and not used at high frequencies.
Therefore, if switching between the display expansion mode and the copy mode is desired, this scheme requires setup at the operating system level, which causes problems of cumbersome operation and susceptibility to display screen resolution after switching between the operating modes.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the multi-screen display system and the method for the electronic blackboard-writing based on the same PC are provided, the problems that a multi-screen display scheme in the prior art is complicated in operation and is easily influenced by the resolution of a display screen after the working mode is switched are solved, duplicate display and asynchronous display of double screens or multiple screens are achieved under a PC extended display mode, the requirement for differential display is met, and the problems of low teaching efficiency and high cost in a double-all-in-one machine scheme are solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the electronic blackboard-writing multi-screen display system based on the same PC comprises the PC and a plurality of display screens which are correspondingly connected through a plurality of display output interfaces;
the plurality of display screens comprise a touch display screen arranged on the platform as a first main screen and at least two display screens, wherein one display screen is used as a second main screen, the other display screens are used as auxiliary screens, and an operating system of the PC works in an extended display mode and is loaded with electronic blackboard-writing software;
the first main screen and the second main screen adopt the same signal source, the first main screen and the second main screen display the same PC desktop, and when the electronic writing software is operated on a PC, the contents of the electronic writing software interfaces displayed on the first main screen and the second main screen are consistent all the time;
the electronic blackboard-writing software at least comprises an electronic blackboard-writing window creating module, a mode switching module and an expansion display front page module;
the electronic blackboard-writing window creating module is used for creating electronic blackboard-writing windows with functions consistent with those of the blackboard-writing function windows on the main screen on each auxiliary screen when the blackboard-writing function windows of the electronic blackboard-writing software are opened and displayed on the first main screen and the second main screen;
the mode switching module is used for selecting and switching the working modes of the auxiliary screen, and the working modes of the auxiliary screen at least comprise an expansion display front page mode;
and the extended display front page module is used for displaying the content of the previous page of the current page in the electronic blackboard-writing window on the main screen in the electronic blackboard-writing windows of the auxiliary screens after the working mode of the currently selected auxiliary screen is the extended display front page mode, and always keeps linkage.
As a further optimization, the working modes of the secondary screen further comprise a synchronous display mode;
the working modes of the auxiliary screen also comprise a synchronous display mode; the electronic blackboard-writing software further comprises a synchronization module;
and the synchronization module is used for synchronously displaying the content in the electronic blackboard-writing window on the main screen in real time in the electronic blackboard-writing windows of the auxiliary screens after the currently selected working mode of the auxiliary screen is the synchronous display mode.
As further optimization, the working mode of the auxiliary screen further comprises a mode of expanding and displaying any page, and the electronic blackboard-writing software further comprises a module of expanding and displaying any page;
and the expansion display any page module is used for displaying a certain page of content in the electronic blackboard-writing window of each sub-screen by appointing after the current working mode of selecting the sub-screen is the expansion display any page mode.
As further optimization, the second main screen and one auxiliary screen are distributed on two sides of a wall behind the platform, and the rest auxiliary screens are distributed on the walls on the left and right sides of the platform.
As further optimization, the second main screen and the auxiliary screen are common display screens or display screens supporting touch control; and if the display screen supports touch control, writing on any screen is supported, and the writing content is stored into the file set of the corresponding file page.
In addition, the invention also provides a multi-screen display method of the electronic blackboard book based on the same PC, which is applied to the multi-screen display system and comprises the following steps:
when the writing function window of the electronic writing software is opened and displayed on the first main screen and the second main screen, electronic writing windows with functions consistent with those of the writing function window on the main screen are created on each auxiliary screen; and selecting the working mode of the auxiliary screen according to the requirement, and if the working mode of the currently selected auxiliary screen is an extended display front page mode, displaying the content of the front page of the current page of the electronic blackboard-writing window of the main screen in the electronic blackboard-writing windows of the auxiliary screens, and always keeping linkage.
As further optimization, the electronic blackboard writing window contains an InkCanvas drawing board assembly, supports drawing ink content, and is added with a drawing assembly, a character assembly and an audio/video assembly; when one page of content in a window is stored, the drawn ink content is stored as an isf file, the picture, the character and the audio and video content are stored by adopting a multimedia file, the picture component, the character component and the audio and video component are stored by adopting an xml file, each component adopts a node record in the xml file, and the nodes at least comprise a node ID, node information, a component width, a height attribute and a position attribute value in an electronic blackboard-writing window; the isf file, the xml file, and the multimedia file make up the set of files for the page in the window.
As a further optimization, the always on linkage comprises:
when the display page of the electronic blackboard writing window on the main screen is switched to the next page or the content of a certain page written in history, the electronic blackboard writing window of the auxiliary screen is correspondingly switched to the previous page of the display page switching target of the electronic blackboard writing window of the main screen for displaying.
As a further optimization, the method further comprises:
and if the currently selected working mode of the auxiliary screen is the synchronous display mode, synchronously displaying the content in the electronic blackboard-writing window of the main screen in the electronic blackboard-writing windows of the auxiliary screens in real time.
As a further optimization, the real-time synchronous display of the display content in the electronic blackboard-writing window of the main screen in the electronic blackboard-writing windows of the auxiliary screens specifically includes:
when the display content in the electronic blackboard-writing window on the main screen changes, the display content is automatically updated to the corresponding file set, and the electronic blackboard-writing window on the auxiliary screen is informed, and after the electronic blackboard-writing window on the auxiliary screen acquires the informing message, the file set corresponding to the content of the electronic blackboard-writing window on the current main screen is reloaded: analyzing isf files in a file set, loading and displaying ink contents in an electronic blackboard-writing window of an auxiliary screen, analyzing xml files in the file set, judging the types of components according to node information so as to load components of corresponding types, and then loading corresponding contents to the components from multimedia files in the file set for displaying;
and when the content is edited in the electronic blackboard-writing window of the main screen, synchronously editing the content in the electronic blackboard-writing windows of the auxiliary screens.
As a further optimization, the synchronous editing specifically includes:
writing synchronization: when writing is carried out in the electronic writing window of the main screen through the writing equipment, the position point of the current writing equipment on the electronic whiteboard is obtained in real time in the moving event of the writing equipment, the position point is converted into an ink mark point according to the style of the current ink mark, and the ink mark point is transmitted to the electronic writing window of the auxiliary screen to be displayed;
erasing synchronization: when ink is erased in an electronic blackboard writing window of a main screen, current ink line data is obtained and copied in a real-time erasing event, and then the copied ink line data is synchronized into an electronic blackboard writing window of an auxiliary screen;
screen clearing synchronization: when the ink content in the electronic blackboard writing window of the main screen is cleaned, the ink content in the electronic blackboard writing window of the auxiliary screen is cleaned synchronously;
content element editing synchronization: when the content elements in the electronic blackboard-writing window of the main screen are edited, the same content elements in the electronic blackboard-writing window of the auxiliary screen are identified through the ID numbers of the content elements, and the same editing operation as the content elements on the main screen is carried out.
As a further optimization, the method further comprises:
and if the working mode of the currently selected auxiliary screen is an expansion display optional page mode, displaying a certain page of content in the electronic blackboard-writing window of each auxiliary screen by appointing.
As a further optimization, the displaying a certain page of content in the electronic blackboard-writing window of each sub-screen by specifying comprises:
acquiring a corresponding file set according to the appointed page number, analyzing the isf files in the file set, displaying ink contents in the electronic blackboard-writing windows of the auxiliary screens, analyzing the xml files in the file set, judging the type of the component according to the node information so as to load the component of the corresponding type, and then loading the corresponding contents to the component from the multimedia files in the file set for displaying.
The invention has the beneficial effects that:
(1) the method has the advantages that the switching of synchronous display and expansion display of the contents of the blackboard writing windows on the main screen and the auxiliary screen is realized in the electronic blackboard writing software, and repeated setting on the level of an operating system is not needed, so that inconvenience caused by unfamiliarity of a user to the operating system and repeated switching of a system display mode is made up, and various problems such as resolution problem caused by adjustment of the display mode can be avoided;
(2) the learner can freely select a screen with a proper viewing angle through the synchronous display function; by expanding the function of displaying the front page, the content of the current page of the main screen and the content of the front page of the current page of the main screen can be displayed on the main screen, and when the current page of the main screen is switched, the pages displayed on the auxiliary screen are also switched in a linkage manner, so that the review and display of the content which is continuous from top to bottom are facilitated, the front-back comparison, the note taking and the like are facilitated, and the repeated page turning and switching operation of a user among different pages is avoided;
(3) by expanding the function of displaying any page, the content of the current plate page can be displayed on the main screen and the content of any appointed page can be displayed on the auxiliary screen, so that the page of any history plate page can be displayed and reviewed under the condition that the content of the main screen is not switched, the operation is simple and convenient, and the personalized requirement is met.
(4) The instructor can directly write and control on the small touch screen (the first main screen) on the platform, the teaching process is not interrupted, so that more eyes and body languages are communicated, the teaching effect is good, the situation that the two all-in-one machines need to move back and forth to write and control in the double-integrated scheme is avoided, and the teaching efficiency is high;
(5) the large-screen display device (the second main screen and the auxiliary screen) can be a common projection screen, a common liquid crystal television, an L ED display screen and the like, can be adapted to any display device, and is good in adaptability and strong in flexibility.
(6) The scheme is supported by only one PC, and compared with a double-all-in-one machine scheme, the implementation cost is lower and the cost performance is higher.
Drawings
FIG. 1 is a schematic diagram of the software implementation logic of the electronic blackboard writing of the present invention;
FIG. 2 is a schematic diagram of the effect of the synchronous display of the two large screens;
FIG. 3 is a diagram illustrating the effect of the double-large-screen expansion display;
fig. 4 is a schematic diagram of the effect of how large screen the display is expanded.
Detailed Description
The invention aims to provide a multi-screen display system and a multi-screen display method for electronic blackboard writing based on the same PC, which solve the problems of complicated operation and easy influence of the resolution of a display screen after the working mode is switched in a multi-screen display scheme in the prior art, realize double-screen or multi-screen copy display and asynchronous display in a PC extended display mode, meet the requirement of differential display, and solve the problems of low teaching efficiency and high cost in a double-all-in-one machine scheme.
The core idea is as follows: based on the same PC, the operating system works in a double-large screen or large screen expansion display mode, the content of the blackboard writing software on the main screen is copied, or the content of the front page is expanded and displayed, or the content of the appointed page is expanded and displayed on other expansion screens; specifically, the method comprises the following steps:
according to the requirement of the user, if the writing content is very important, the user can execute a 'synchronous display' mode through the writing software, and the writing content, dynamic operation, video media and the like in the software window on the main display screen are displayed on the expansion screen in a copy mode on the same screen, and keep the picture and action consistent with the software window on the main screen in real time.
If the logical reasoning of the upper page and the lower page of the writing content is very tight and the preorder page needs to be displayed to the audience, the mode of 'expanding and displaying the front page' can be executed through software, the front page content written by the user in the electronic blackboard-writing window is displayed in the expanding screen, the current page writing content is displayed in the electronic blackboard-writing window on the main screen, and when the user switches and displays a certain page content written in history on the main screen, the expanding screen is linked to switch to the main screen to switch to the front page displayed after the main screen is switched, namely, the linkage is always kept.
In addition, the invention can also execute an 'expansion display any page mode' through the blackboard-writing software, and display the content of the current blackboard page on the main screen and the content of any appointed page on the expansion screen, thereby realizing the display and review of any history blackboard page under the condition that the main screen content is not switched, having simple and convenient operation and meeting the personalized requirement.
The following describes in detail the electronic tablet book multi-screen display system and method based on the same PC in the present invention, using the teaching scene as an embodiment:
in this embodiment, the system architecture for implementing multi-screen display of electronic blackboard writing includes a PC and a plurality of display screens correspondingly connected via a plurality of display output interfaces, where the plurality of display screens includes a small touch-writable screen disposed on a platform as a first main screen; the wall-mounted large screen is used as a second main screen, and the other wall-mounted large screens are used as auxiliary screens; the operating system of the PC works in an extended display mode and is loaded with electronic blackboard-writing software, wherein the electronic blackboard-writing software comprises an electronic blackboard-writing window creating module, a synchronization module, a mode selection module and an extended display front page module;
when the electronic blackboard writing software is operated on a PC, the contents of the electronic blackboard writing software interfaces displayed on the first main screen and the second main screen are consistent all the time;
the electronic blackboard-writing window creating module is used for creating electronic blackboard-writing windows with functions consistent with those of the blackboard-writing function windows on the main screen on each auxiliary screen when the blackboard-writing function windows of the electronic blackboard-writing software are opened and displayed on the first main screen and the second main screen;
the mode switching module is used for selecting and switching the working modes of the auxiliary screen, and the working modes of the auxiliary screen at least comprise an expansion display front page mode;
and the extended display front page module is used for displaying the content of the previous page of the current page of the electronic blackboard-writing window of the main screen in the electronic blackboard-writing window of each auxiliary screen after the working mode of the currently selected auxiliary screen is the extended display front page mode, and always keeps linkage.
The system scheme can meet the requirement of performing front page expansion display on the current page on the main screen on the auxiliary screen;
as a preferred scheme, in order to meet the requirement of synchronous display of the secondary screen and the primary screen, a synchronous display mode can be further set in the working mode of the secondary screen, and a synchronization module can be further added in the electronic blackboard-writing software, and is used for synchronously displaying the content in the electronic blackboard-writing window on the primary screen in real time in the electronic blackboard-writing windows of the secondary screens after the currently selected working mode of the secondary screen is the synchronous display mode.
As a preferred scheme, in order to meet the requirement of extended display of any page on the sub-screen, an extended display module for displaying any page may be added to the electronic blackboard-writing software, and is configured to display a certain page in the electronic blackboard-writing window of each sub-screen by designation after the currently selected working mode of the sub-screen is the extended display mode of any page.
In order to achieve better visual effect and teaching application value, the two wall-mounted large screens can be arranged on the walls at the two sides of the blackboard, so that a learner can freely select a screen with a proper viewing angle; for the classroom layout with the requirement of group discussion, on the basis of the two wall-mounted large screens, a proper number of wall-mounted large screens can be added on the surrounding walls, so that learners of the group discussion can find the screens suitable for watching the learners. According to actual requirements, the wall-mounted large screen can be a large screen for common display to reduce cost as much as possible, and can also be a large screen with a touch writing function, so that a user (teacher) can write on any screen, flexibility is achieved, and teaching efficiency can be improved.
Based on the system architecture, the software logic for realizing the multi-screen display of the electronic blackboard writing is shown in fig. 1, a first main screen (small screen) and a second main screen (large screen) adopt the same signal source, the two screens always display the same PC desktop, the electronic blackboard writing software is operated on the PC, the contents of the interfaces of the electronic blackboard writing software displayed on the first main screen (small screen) and the second main screen (large screen) are consistent, a blackboard writing function window of the electronic blackboard writing software is opened, the contents displayed by the window are stored into a file set comprising an ink mark isf file, a whiteboard xml file and a multimedia file, the blackboard writing function window with the consistent functions is created on an auxiliary screen, and the window on the auxiliary screen is loaded and analyzed through the file set of the main blackboard writing function window, so that the display of the corresponding contents is realized. The stored file sets are page units, namely each page corresponds to one file set, the auxiliary blackboard-writing function window loads and displays the file sets by acquiring the page number of the currently displayed page of the main blackboard-writing function window, and the synchronous display function can be realized by keeping real-time editing synchronization; the auxiliary screen writing function window loads and displays a previous page file set of the page number of the current display page of the main screen writing function window by acquiring, and keeps linkage with the display page of the main screen, so that the function of expanding and displaying the previous page can be realized; the auxiliary screen book function window is loaded and displayed by acquiring the file set of any specified page number, so that the function of expanding and displaying any page can be realized.
When the electronic writing software is applied specifically, the synchronous display function, the function of expanding and displaying the front page and the function of expanding and displaying any page can be switched freely through the corresponding buttons, so that the operation is simplified, and the problem of resolution caused by frequently switching the display mode on the operating system level is solved.
After the electronic writing software is started, the writing software creates the same electronic writing Windows on the main screen and the auxiliary screen, the Windows are paved on the whole screen, and the electronic writing Windows contain an Inkcanvas drawing board component of a Windows operating system. Ink content can be drawn on the drawing board component, and components such as pictures, characters, audio and video can be added.
The content of the drawing board can be stored, when the content is stored, the drawn ink content is stored as an isf file, the picture, the character and the audio-video content are stored by adopting a multimedia file, the drawing component, the character component and the audio-video component are stored by adopting an xml file, and each component is recorded by adopting a node in the xml file; the nodes at least comprise node ID, node information, component width, height attribute and position attribute value in the electronic writing board window, so that the content of one page of the writing board can be stored as a file set of an isf file, an xml file and a multimedia file.
On this basis, the implementation of three functions of synchronous display, expanded display of the front page and expanded display of any page is described as follows:
(1) and (3) synchronous display:
according to the actual requirements of users, if the written content is very important or needs to be observed by audiences facing a large screen, a synchronous display scheme can be adopted. The user selects a synchronous display mode through a software button to keep the display contents of the main screen and the auxiliary screen consistent, namely the display contents of the first main screen (small screen), the second main screen (large screen) and the auxiliary screen (large screen) are kept consistent. And the content written by the electronic board book window, the displayed characters, pictures, audio and video and the like on the first main screen (small screen) are synchronously displayed on all screens by the user, and meanwhile, if the large screen supports touch control, the content written on any screen can be synchronously displayed on other screens. The effect of using the double large screen synchronous display is schematically shown in fig. 2.
After the 'synchronous display mode' is selected, the current display content in the electronic blackboard-writing window of the main screen is stored through an ink mark isf file, a whiteboard xml file and a multimedia file, the display content in the electronic blackboard-writing window of the main screen is updated to a corresponding file set in real time each time the display content in the electronic blackboard-writing window of the main screen changes, meanwhile, the electronic blackboard-writing window of the auxiliary screen is informed through message communication in the same program, the file set corresponding to the content of the current electronic blackboard-writing window of the main screen is reloaded after the electronic blackboard-writing window of the auxiliary screen obtains a message, in the loading process, an InkCanvas component automatically analyzes the isf file to load handwriting ink marks, analyzes an XM L file to create the content of the multimedia component, and therefore the content same as that of the electronic blackboard-writing.
In order to ensure that ink content changes synchronously (writing, erasing, screen cleaning) and components change synchronously (components move, zoom out, rotate, text content style changes, audio and video synchronous playing stops, and the like), when content editing is carried out on the main screen electronic whiteboard, the same content on the auxiliary screen electronic whiteboard is also edited synchronously:
① writing synchronization, when the mouse or digit pen of main screen electronic whiteboard is pressed to start ink mark drawing, the position point of current mouse or digit pen on whiteboard is obtained in real time in mouse or digit pen moving event, the position point is converted into ink mark point according to current ink mark style (thickness, color), the ink mark point is transmitted to sub screen whiteboard to be displayed, when the mouse or digit pen is released, one ink mark line is drawn.
If the touch-supporting device is used for drawing, the system can automatically perform pressure induction processing on the lines during the drawing process of the lines drawn on the main screen, after one line is drawn, ink contents of the main screen white board are stored in the isf file of the current page, and then the isf file is loaded and displayed by the auxiliary screen white board, so that the ink contents in the auxiliary screen and the main screen electronic board book window are consistent, and the effect of similar synchronization is achieved.
② erase synchronization, when erasing ink in the main screen electronic whiteboard, in the real-time erase event, acquiring the ink line data of the current main screen, copying the data, and then synchronizing the copied ink data to the auxiliary screen electronic board book window.
③ clear screen synchronization, when the main screen is cleared of the electronic blackboard-writing content, the same clear screen operation is performed on the sub-screen electronic whiteboard.
④ synchronization of editing content elements when editing content elements (characters, pictures, audios and videos, etc.) on the main screen electronic whiteboard, the same content elements in the electronic blackboard-writing window of the auxiliary screen are identified by the ID numbers of the content elements, and the same editing operation as the content elements on the main screen is performed.
(2) And expanding and displaying the front page:
according to the actual requirements of users, if the written content is more and the logical reasoning and consistency of the front page and the back page are stronger, the front page needs to be displayed to learners completely, and the scheme of expanding and displaying the front page can be adopted. The user selects the 'expansion display front page mode' through the software button, so that the content of the current page of the electronic blackboard book can be displayed on the first main screen (small screen) and the second main screen (large screen), and the content of the previous page of the electronic blackboard book can be displayed on the auxiliary screen (large screen). The effect of displaying the previous page by adopting the double-large-screen expansion is schematically shown in fig. 3, and the previous page content of the main screen is displayed on the auxiliary screen; the effect of how large the screen expansion is used to display the previous page is schematically shown in fig. 4, where all the sub-screens display the previous page of the main screen.
After the 'expansion display front page mode' is selected, the auxiliary screen obtains the page number of the previous page through the page number of the current page in the electronic blackboard-writing window of the main screen, and the ink mark isf file, the white board xml file and the multimedia file in the file set of the previous page are loaded, so that the electronic blackboard-writing content of the previous page is expanded and displayed.
When the page is adjusted in the main screen electronic blackboard-writing window, the auxiliary screen can automatically turn pages in linkage, for example: and if the Nth page is currently displayed on the main screen, the Nth-1 st page is currently displayed on the auxiliary screen. Therefore, the method is beneficial to the review and display of the up-and-down consistency content, is convenient for front-and-back comparison, note taking and the like, and avoids the repeated page turning and switching operation of the user among different pages. It should be noted that, when the main screen is currently displayed as the first page, the sub-screen is currently also displaying the first page.
(3) And expanding and displaying any page:
according to the actual requirements of users, if a page of historical written contents needs to be reviewed in the process of explaining the blackboard writing, and meanwhile, the current contents of the main screen electronic whiteboard are kept unchanged, a scheme of expanding and displaying any page can be adopted. The user selects an 'expansion display arbitrary page mode' through a software button, so that the content of the current page of the electronic blackboard can be displayed on a first main screen (small screen) and a second main screen (large screen), and the content of the electronic blackboard-writing of a specified page can be displayed on a secondary screen (large screen).
After the 'expansion display any page mode' is selected, the auxiliary screen acquires a corresponding file set through the page number of the appointed page, and loads an ink mark isf file, a white board xml file and a multimedia file in the file set, so that the electronic blackboard-writing content of the appointed page is expanded and displayed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, it should be noted that any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (13)
1. The multi-screen display system for electronic blackboard writing based on the same PC comprises a PC and a plurality of display screens correspondingly connected through a plurality of display output interfaces, and is characterized in that,
the plurality of display screens comprise a touch display screen arranged on the platform as a first main screen and at least two display screens, wherein one display screen is used as a second main screen, the other display screens are used as auxiliary screens, and an operating system of the PC works in an extended display mode and is loaded with electronic blackboard-writing software;
the first main screen and the second main screen adopt the same signal source, the first main screen and the second main screen display the same PC desktop, and when the electronic writing software is operated on a PC, the contents of the electronic writing software interfaces displayed on the first main screen and the second main screen are consistent all the time;
the electronic blackboard-writing software at least comprises an electronic blackboard-writing window creating module, a mode switching module and an expansion display front page module;
the electronic blackboard-writing window creating module is used for creating electronic blackboard-writing windows with functions consistent with those of the blackboard-writing function windows on the main screen on each auxiliary screen when the blackboard-writing function windows of the electronic blackboard-writing software are opened and displayed on the first main screen and the second main screen;
the mode switching module is used for selecting and switching the working modes of the auxiliary screen, and the working modes of the auxiliary screen at least comprise an expansion display front page mode;
and the extended display front page module is used for displaying the content of the previous page of the current page in the electronic blackboard-writing window on the main screen in the electronic blackboard-writing windows of the auxiliary screens after the working mode of the currently selected auxiliary screen is the extended display front page mode, and always keeps linkage.
2. A multi-screen display system for electronic blackboard writing based on the same PC as in claim 1,
the working modes of the auxiliary screen also comprise a synchronous display mode; the electronic blackboard-writing software further comprises a synchronization module;
and the synchronization module is used for synchronously displaying the content in the electronic blackboard-writing window on the main screen in real time in the electronic blackboard-writing windows of the auxiliary screens after the currently selected working mode of the auxiliary screen is the synchronous display mode.
3. A multi-screen display system for electronic blackboard writing based on the same PC as in claim 1,
the working mode of the auxiliary screen also comprises a mode of expanding and displaying any page, and the electronic blackboard-writing software also comprises a module of expanding and displaying any page;
and the expansion display any page module is used for displaying a certain page of content in the electronic blackboard-writing window of each sub-screen by appointing after the current working mode of selecting the sub-screen is the expansion display any page mode.
4. A multi-screen display system for electronic blackboard writing based on the same PC as in claim 1,
the second main screen and one auxiliary screen are distributed on two sides of a wall behind the platform, and the rest auxiliary screens are distributed on the wall on the left side and the right side of the platform.
5. A multi-display system for electronic book based on the same PC as any one of claims 1-4,
the second main screen and the auxiliary screen are common display screens or display screens supporting touch control; and if the display screen supports touch control, writing on any screen is supported, and the writing content is stored into the file set of the corresponding file page.
6. The multi-screen display method of the electronic blackboard book based on the same PC is applied to the multi-screen display system according to any one of claims 1 to 5, and is characterized by comprising the following steps:
when the writing function window of the electronic writing software is opened and displayed on the first main screen and the second main screen, electronic writing windows with functions consistent with those of the writing function window on the main screen are created on each auxiliary screen; and selecting the working mode of the auxiliary screen according to the requirement, and if the working mode of the currently selected auxiliary screen is an extended display front page mode, displaying the content of the front page of the current page of the electronic blackboard-writing window of the main screen in the electronic blackboard-writing windows of the auxiliary screens, and always keeping linkage.
7. A multi-screen display method for electronic blackboard book based on the same PC as in claim 6,
the electronic board writing window contains an Inkcanvas drawing board assembly, supports drawing ink content, and is added with a drawing board assembly, a character assembly and an audio and video assembly; when one page of content in a window is stored, the drawn ink content is stored as an isf file, the picture, the character and the audio and video content are stored by adopting a multimedia file, the picture component, the character component and the audio and video component are stored by adopting an xml file, each component adopts a node record in the xml file, and the nodes at least comprise a node ID, node information, a component width, a height attribute and a position attribute value in an electronic blackboard-writing window; the isf file, the xml file, and the multimedia file make up the set of files for the page in the window.
8. A multi-screen display method for electronic blackboard book based on the same PC as in claim 6,
the always-on linkage includes: when the display page of the electronic blackboard writing window on the main screen is switched to the next page or the content of a certain page written in history, the electronic blackboard writing window of the auxiliary screen is correspondingly switched to the previous page of the display page switching target of the electronic blackboard writing window of the main screen for displaying.
9. A multi-screen display method for electronic blackboard book based on the same PC as in claim 6,
the method further comprises the following steps:
and if the currently selected working mode of the auxiliary screen is the synchronous display mode, synchronously displaying the contents in the electronic blackboard-writing window on the main screen in the electronic blackboard-writing windows of the auxiliary screens in real time.
10. A multi-screen display method for electronic blackboard book based on the same PC as that in claim 9,
the real-time synchronous display of the display contents in the electronic blackboard-writing window on the main screen in the electronic blackboard-writing windows of the auxiliary screens specifically comprises:
when the display content in the electronic blackboard-writing window on the main screen changes, the display content is automatically updated to the corresponding file set, and the electronic blackboard-writing window on the auxiliary screen is informed, and after the electronic blackboard-writing window on the auxiliary screen acquires the informing message, the file set corresponding to the content of the electronic blackboard-writing window on the current main screen is reloaded: analyzing isf files in a file set, loading and displaying ink contents in an electronic blackboard-writing window of an auxiliary screen, analyzing xml files in the file set, judging the types of components according to node information so as to load components of corresponding types, and then loading corresponding contents to the components from multimedia files in the file set for displaying;
and when the content is edited in the electronic blackboard-writing window of the main screen, synchronously editing the content in the electronic blackboard-writing windows of the auxiliary screens.
11. A multi-screen display method for electronic blackboard book based on the same PC as that in claim 10,
the synchronous editing specifically comprises:
writing synchronization: when writing is carried out in the electronic writing window of the main screen through the writing equipment, the position point of the current writing equipment on the electronic whiteboard is obtained in real time in the moving event of the writing equipment, the position point is converted into an ink mark point according to the style of the current ink mark, and the ink mark point is transmitted to the electronic writing window of the auxiliary screen to be displayed;
erasing synchronization: when ink is erased in an electronic blackboard writing window of a main screen, current ink line data is obtained and copied in a real-time erasing event, and then the copied ink line data is synchronized into an electronic blackboard writing window of an auxiliary screen;
screen clearing synchronization: when the ink content in the electronic blackboard writing window of the main screen is cleaned, the ink content in the electronic blackboard writing window of the auxiliary screen is cleaned synchronously;
content element editing synchronization: when the content elements in the electronic blackboard-writing window of the main screen are edited, the same content elements in the electronic blackboard-writing window of the auxiliary screen are identified through the ID numbers of the content elements, and the same editing operation as the content elements on the main screen is carried out.
12. A multi-screen display method for electronic blackboard book based on the same PC as in claim 6,
the method further comprises the following steps:
and if the working mode of the currently selected auxiliary screen is an expansion display optional page mode, displaying a certain page of content in the electronic blackboard-writing window of each auxiliary screen by appointing.
13. A multi-screen display method for electronic blackboard book based on the same PC as that in claim 12,
the method for displaying a certain page of content in the electronic blackboard-book window of each auxiliary screen through designation specifically comprises the following steps:
acquiring a corresponding file set according to the appointed page number, analyzing the isf files in the file set, displaying ink contents in the electronic blackboard-writing windows of the auxiliary screens, analyzing the xml files in the file set, judging the type of the component according to the node information so as to load the component of the corresponding type, and then loading the corresponding contents to the component from the multimedia files in the file set for displaying.
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