CN109509375B - Recording and broadcasting integrated intelligent comprehensive screen blackboard system and control method thereof - Google Patents
Recording and broadcasting integrated intelligent comprehensive screen blackboard system and control method thereof Download PDFInfo
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- CN109509375B CN109509375B CN201811445493.4A CN201811445493A CN109509375B CN 109509375 B CN109509375 B CN 109509375B CN 201811445493 A CN201811445493 A CN 201811445493A CN 109509375 B CN109509375 B CN 109509375B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- 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
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0481—Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- 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
- G06F3/1454—Digital output to display device ; Cooperation and interconnection of the display device with other functional units involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/08—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations
- G09B5/14—Electrically-operated educational appliances providing for individual presentation of information to a plurality of student stations with provision for individual teacher-student communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/048—Indexing scheme relating to G06F3/048
- G06F2203/04803—Split screen, i.e. subdividing the display area or the window area into separate subareas
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Abstract
The recording and broadcasting integrated intelligent comprehensive screen blackboard system comprises an audio acquisition module, at least one video acquisition module, an all-in-one machine and at least one black screen; the black screen, the audio acquisition module and the video acquisition module are electrically connected with the all-in-one machine; the audio acquisition module is used for acquiring an audio signal of a user and outputting the signal to the all-in-one machine; the video acquisition module is used for acquiring image signals in the system installation environment and outputting the image signals to the all-in-one machine; a black screen for displaying the user's writing pad and displaying the updated writing pad in response to the user's operation; meanwhile, the writing board and the operation information of the user are output to the integrated machine in the same screen mode; the all-in-one machine is used for displaying the black screen writing board in the same screen mode or independently displaying the writing board of the all-in-one machine in the split screen mode, simultaneously displaying the image signal acquired by the video acquisition module, and storing the picture of the display of the all-in-one machine and the audio signal from the audio acquisition module in real time. The system thoroughly intelligentizes the blackboard.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of intelligent education appliances, in particular to an intelligent comprehensive screen blackboard system with recording and broadcasting functions.
[ background of the invention ]
In the most original classroom teaching mode, a teacher writes on a blackboard with chalk, and then erases unnecessary blackboard writing with a blackboard eraser. The residual chalk powder on the blackboard influences the next writing effect, and the chalk powder needs to be erased for multiple times and even needs to be scrubbed for multiple times by water; the flying and falling of the chalk powder not only dirties the indoor environment, but also is a pollution source for human bodies. And the teaching content can not be stored, the teaching scene can not be reproduced at that time, and other people can not evaluate the teaching effect according to the student reflection.
With the increase in the level of technology, improved blackboards have emerged. The platform is provided with an intelligent host, and the display screen is arranged on the multifunctional blackboard in the center of the blackboard through projection or the like. The teacher can still give lessons in the most original mode, and simultaneously can display edited files or audio and video files by using the function of the intelligent host. Such an improved blackboard still has the disadvantages of the original blackboard.
[ summary of the invention ]
In view of this, the invention provides an intelligent full-screen blackboard system integrating recording and broadcasting.
The invention adopts the following technical scheme that an intelligent recording and broadcasting integrated comprehensive screen blackboard system is constructed, and the intelligent recording and broadcasting integrated comprehensive screen blackboard system comprises an audio acquisition module, at least one video acquisition module, an all-in-one machine and at least one black screen; black screens are arranged on both sides of the display of the all-in-one machine; the display of the all-in-one machine can be split into a plurality of display areas with the number not less than that of the black screens, and an independent display area on the display of the all-in-one machine corresponds to each black screen; the black screen, the audio acquisition module and the video acquisition module are electrically connected with the all-in-one machine;
the audio acquisition module is used for acquiring an audio signal of a user and outputting the audio signal to the all-in-one machine;
the video acquisition module is used for acquiring image signals in the system installation environment and outputting the image signals to the all-in-one machine;
a black screen for displaying the user's writing pad and displaying the updated writing pad in response to the user's operation; meanwhile, the writing board and the operation information of the user are output to the integrated machine in the same screen mode;
the all-in-one machine is used for displaying the black screen writing board in the same screen mode or independently displaying the writing board of the all-in-one machine in the split screen mode, simultaneously displaying the image signal acquired by the video acquisition module, and storing the picture of the display of the all-in-one machine and the audio signal from the audio acquisition module in real time.
Preferably, the operation information of the user on the black screen comprises virtual key input information, when the information is collected by the black screen, the information is output to the all-in-one machine, the all-in-one machine analyzes the information to form a corresponding functional module, then the updated writing information is displayed on the display by the response functional module, meanwhile, a data packet corresponding to the functional module is sent to the black screen, and the updated writing information is displayed by the response functional module after the functional module is analyzed by the black screen.
Preferably, the black screen comprises a writing touch area, the writing touch area comprises a writing area and a virtual key area, and the virtual key area is arranged at the edge of the writing area.
Preferably, the black screen further comprises a physical key area, and the physical key area is arranged along the outer edge of the writing touch control area.
Preferably, the black screen and the all-in-one machine are arranged side by side and detachably connected.
Preferably, the black screen and the all-in-one machine are electrically connected in a USB mode.
The invention also provides a control method of the recording and broadcasting integrated intelligent comprehensive screen blackboard system, which comprises the following steps:
a10, the video acquisition module acquires image information in the system installation environment in real time;
a11, the audio acquisition module acquires the user audio information in real time;
the steps a10 and a11 are carried out simultaneously;
also comprises the following steps:
a12, acquiring input information of a user in real time by a black screen, and forming a data packet with a custom format;
or
a13, the all-in-one machine collects the input information of the user in real time and forms a data packet with a custom format;
the steps a12, a13 are carried out simultaneously with a10, a 11;
the control method also comprises the following steps:
c10, the all-in-one machine receives the data packets in the step a12 or a13, analyzes one data packet according to the balance and analyzes the data packet into the corresponding function module;
d10, the response function module of the all-in-one machine displays the latest writing information on the display and simultaneously displays the image information;
e10 the all-in-one machine stores the picture and audio signal of the display in real time to generate video files.
Preferably, the input information of the user in step a12 includes virtual key input information, and when the all-in-one machine parses the data packet in step a12, the control method further includes the following steps:
d11, the all-in-one machine sends the data packet corresponding to the functional module in the step c10 to a black screen;
e10, black screen parsing the data packet in the step d 11;
f10 the black screen response function displays the latest written information.
Preferably, the user input information in step a12 further includes written information and physical key input information, and the control method further includes the following steps:
b10, resolving the data packet in the step a12 by a black screen, and resolving the data packet into a corresponding function module;
c11 the black screen response function displays the latest written information.
Preferably, when the all-in-one machine parses the data packet in step a13, the control method further includes the following steps:
b11, resolving the data packet in the step a12 by a black screen, and resolving the data packet into a corresponding function module;
c12 the black screen response function displays the latest written information.
The beneficial technical effects of the invention are as follows:
1. when a user has a playing requirement, the video file with writing, image and audio stored on the all-in-one machine can be played, or the video file can be copied and shared. The video file that intelligent blackboard system recorded in this embodiment, can also be when reading during the all-in-one, use all-in-one physics peripheral hardware and virtual function module, carry out the secondary to writing information and edit the demand in order to realize that the user corrects or update, teaching image file under the current mode relatively, the teaching file availability ratio that this intelligent blackboard system generated is higher, teacher's work load has been alleviateed, this video file contains teacher's and student's image information and audio information simultaneously, also be convenient for assess teacher's teaching quality, can also be according to student's on-the-spot feedback, further improve teaching quality.
2. The recording and broadcasting integrated intelligent comprehensive screen blackboard system is convenient to disassemble and assemble and high in standardization degree; meanwhile, the current blackboard is completely intelligentized.
[ description of the drawings ]
Fig. 1 is a schematic composition diagram of an intelligent recording and broadcasting integrated comprehensive screen blackboard system in the first embodiment;
fig. 2 is a schematic view of a control structure of a black screen and an all-in-one machine in a recording and broadcasting integrated intelligent full-screen blackboard system in the first embodiment;
fig. 3 is a schematic diagram of a writing and displaying control flow of the recording and broadcasting integrated intelligent comprehensive screen blackboard system in the same screen mode in the first embodiment;
fig. 4 is a schematic view of a physical key input control flow in a same-screen mode of a recording and broadcasting integrated intelligent comprehensive screen blackboard system in the first embodiment;
fig. 5 is a schematic view of a control flow of virtual key input in the same screen mode of a recording and broadcasting integrated intelligent comprehensive screen blackboard system in the first embodiment;
fig. 6 is a schematic control flow diagram of a control method of a recording and broadcasting integrated intelligent comprehensive screen blackboard system in a split screen mode in the first embodiment;
[ detailed description ] embodiments
In order to make the technical solutions and technical effects of the present patent clearer, the following describes in detail specific embodiments of the present patent with reference to the accompanying drawings and examples.
The first embodiment is as follows:
the recording and broadcasting integrated intelligent comprehensive screen blackboard system in the embodiment comprises an audio acquisition module 1, at least one video acquisition module 2, an all-in-one machine 3 and at least one black screen 4; black screens 4 are arranged on both sides of the display of the all-in-one machine; the display of the all-in-one machine can be split into a plurality of display areas with the number not less than the number of the black screens, and an independent display area on the display of the all-in-one machine corresponds to each black screen; the black screen 4, the audio acquisition module 1 and the video acquisition module 2 are electrically connected with the integrated machine 3.
As shown in fig. 1, specifically, the audio acquisition module 1 is configured to acquire an audio signal of a user and output the audio signal to the all-in-one machine 3, and may be electrically connected or wirelessly connected to the all-in-one machine 3, where the audio acquisition module 1 in this embodiment is implemented by a microphone.
The two video acquisition modules 2 are arranged at the top ends of the left side and the right side of the intelligent blackboard and are electrically connected with the all-in-one machine, the video modules can rotate to record image signals of students and/or teachers, and the video acquisition modules electrically connected with the all-in-one machine 3 can be arranged behind a classroom to record teaching scenes from the rear end angle of the classroom. The video acquisition module 2 in this embodiment is implemented by a camera.
The black screen 4 includes a writing touch area 41 and a physical key area 42; the writing touch area 41 may be an infrared touch screen, an electromagnetic touch screen, a capacitive touch screen, or the like, and includes a writing area 411 and a virtual key area 412, wherein the shape of the writing area 411 matches the shape of the black screen 4 and covers the black screen maximally. The physical key area 42 is located below the writing touch area, and is provided with a series of physical keys, such as saving, sharing, two-dimensional code generation, local erasing, one-key screen clearing, black screen, resource query, red pen, black pen, blue pen, music, screenshot, mode switching, and the like, so that the functions of the blackboard are enriched, and teaching resources are enriched. The user can write and draw pictures and texts on the writing area by using hard objects such as chalk and pen shells. The virtual key area 412 is a series of touch marks similar to physical key functions and is arranged at the edge of the black screen writing touch area 41, in the embodiment, the virtual key area 412 of the left black screen is arranged at the left edge of the writing touch area 41, the virtual key area 412 of the right black screen is arranged at the right edge of the writing touch area 41, and the screen printing marks are quick key keys with different functions, so that the virtual quick key can quickly respond to user operation, the operation is convenient and quick, and the processing efficiency is improved.
The number of the black screens 4 is two, the black screens are respectively arranged on the left side and the right side of the all-in-one machine 3, the all-in-one machine display comprises a left display area 31 and a right display area 32, the left display area 31 corresponds to the left black screen, and the right display area 32 corresponds to the right black screen. The two black screens 4 and the integrated machine 3 are arranged side by side to form an intelligent blackboard matched with the shape of a physical blackboard in the current classroom. The black screen 4 is used for displaying the writing board of a teacher or a student, and the all-in-one machine display is used for displaying the writing board of the black screen in the same screen mode or independently displaying the writing board of the all-in-one machine in the split screen mode and simultaneously displaying the image signal acquired by the video acquisition module 2; the black screen 4 is a black liquid crystal screen, and the integrated machine display is a white liquid crystal screen. The black screen gives consideration to the writing habit of a part of original blackboards of users, and is equivalent to a white computer liquid crystal screen, low in power consumption and environment-friendly. The corresponding relation between the display and the black screen of the all-in-one machine has other changes, for example, the display of the all-in-one machine is divided into three or more display areas, two of the display areas correspond to the left and right black screens one by one, and the other display areas can be used for displaying image signals acquired by the single writing or video acquisition module 3 in the same screen mode, or corresponding blind interpretation pictures and the like.
The black screen 4 is fixed with the all-in-one machine 3 through a buckle, so that the intelligent blackboard system can be conveniently disassembled and assembled. The electric connection of the black screen 4 and the all-in-one machine 3 is a USB connection, so that the standardization degree of the equipment is improved.
The display of the all-in-one machine is also provided with icons or shortcut keys with functions similar to the virtual keys of the black screen, so that a user can edit the blackboard-writing on one side of the all-in-one machine 3 conveniently.
The recording and broadcasting integrated intelligent comprehensive screen blackboard system in the embodiment further comprises physical peripheral equipment such as a wired/wireless keyboard, a mouse and the like connected with the all-in-one machine.
Referring to fig. 2, the black screen comprises a black screen acquisition unit, a black screen display unit, a black screen communication unit and a black screen control unit.
The black screen acquisition unit is used for acquiring writing track information, physical key information and virtual key information on a black screen in real time and forming a data packet;
the black screen display unit is used for displaying the writing information in real time according to the instruction of the black screen control unit;
the black screen communication unit is used for sending data from the black screen control unit to the all-in-one machine communication unit and receiving the data from the all-in-one machine communication unit;
the black screen control unit is used for analyzing the data packet of the black screen acquisition unit and sending the analyzed data to the black screen display unit;
the all-in-one machine comprises an all-in-one machine acquisition unit, an image acquisition unit, an audio acquisition unit, an all-in-one machine display unit, an all-in-one machine storage unit, an all-in-one machine communication unit and an all-in-one machine control unit.
The all-in-one machine acquisition unit is used for acquiring writing track information on the all-in-one machine display in real time, physical peripheral input information connected with the all-in-one machine and virtual key input information on the all-in-one machine display and forming a data packet;
the image acquisition unit is used for acquiring image signals in the classroom in real time and outputting the image signals to the integrated machine control unit, and comprises images of students and teachers;
the audio acquisition unit is used for acquiring audio signals of a user in real time and outputting the audio signals to the all-in-one machine control unit;
the all-in-one machine display unit is used for displaying writing information and image information in real time according to an instruction of the all-in-one machine control unit;
the all-in-one machine storage unit is used for storing the picture and the real-time audio signal of the all-in-one machine display in real time according to the instruction of the all-in-one machine control unit and generating a video file; video file formats such as avi, MP4, swf.
The all-in-one machine communication unit is used for sending data from the all-in-one machine control unit to the black screen communication unit and receiving the data from the black screen communication unit;
and the all-in-one machine control unit is used for analyzing the data packet from the all-in-one machine acquisition unit and/or the all-in-one machine communication unit, sending the analyzed data to the all-in-one machine display unit, processing the data from the image acquisition unit, sending the processed data to the all-in-one machine display unit, processing the data from the audio acquisition unit and sending the processed data to the all-in-one machine storage unit.
The recording and broadcasting integrated intelligent comprehensive screen blackboard system in the embodiment can work in two modes: the same screen mode and the split screen mode. In the same-screen mode, the writing information of the black screen is synchronously displayed by the display of the all-in-one machine; and in the split screen mode, the all-in-one machine display and the black screen independently display respective writing information and respond to respective physical key input and virtual key input.
Same screen mode
The control method of the recording and broadcasting integrated intelligent comprehensive screen blackboard system in the embodiment includes three conditions: writing display control, physical key input control and virtual key input control.
As shown in fig. 3, the control of the intelligent blackboard system control method during writing display includes the following steps:
a10, acquiring writing track information in real time by a black screen, and forming a data packet with a custom format;
b10, resolving the data packet in the step a10 in a black screen mode;
c10, displaying a writing track according to the analyzed data by a black screen;
the black screen performs the following steps while performing step b10:
b11, the blank screen sends the data packet in the step a10 to the all-in-one machine;
the intelligent blackboard system control method further comprises the following steps during writing display:
a11, acquiring image information in real time by a camera;
a12, acquiring audio information by a microphone in real time;
c11, the all-in-one machine analyzes the received data packet from the black screen into the information of the point corresponding to the display position of the all-in-one machine;
d10, drawing the corresponding writing track on the display according to the analysis information by the integrated machine, and displaying the image information at the same time; in order to avoid the occlusion of the writing track by the image information, the image information may be displayed in a small window form on the upper left and upper right, or the lower left and lower right, or other positions of the display of the all-in-one machine.
e10 the all-in-one machine stores the picture and audio signal of the display in real time to generate video files.
As shown in fig. 4, the control method of the recording and broadcasting integrated intelligent comprehensive screen blackboard system includes steps similar to those of writing and displaying when physical keys are input, except that signals acquired in real time by the black screen are changed into physical key information, and the subsequent black screen and the all-in-one machine analyze the physical key information into corresponding functional modules and perform corresponding functional processing on the written information before the physical keys are input.
As shown in fig. 5, the control method of the recording and broadcasting integrated intelligent comprehensive screen blackboard system during virtual key input includes the following steps:
a20, collecting virtual key information in real time by a black screen, and forming a data packet with a custom format;
a21, acquiring image information in real time by a camera;
a22, acquiring audio information by a microphone in real time;
b20, the blank screen sends the data packet in the step a20 to the all-in-one machine;
c20, the all-in-one machine analyzes the received data packet from the black screen into a corresponding functional module;
d20, the all-in-one machine response function module displays the updated writing information on the display and simultaneously displays the image information;
e20 the all-in-one machine stores the picture and audio signal of the display in real time to generate video files.
The following steps are also included after step c20:
d21, the all-in-one machine sends the data packet corresponding to the functional module in the step c20 to a black screen;
e21, black screen parsing the data packet in the step d 21;
f21 displaying the updated writing information by the black screen response function module.
After the virtual keys of the black screen are input, the data packet sending all-in-one machine is analyzed and processed by the black screen, writing information is updated by the black screen according to instructions of the all-in-one machine, the accuracy of data storage of the all-in-one machine is guaranteed when the black screen and a display of the all-in-one machine display the same screen, and data loss caused by quick response of the virtual keys is avoided.
Split screen mode
Fig. 6 is a flowchart of a control method of the black screen and the all-in-one machine in the split screen mode, which is similar to the control method of the same screen mode, except that the black screen and the all-in-one machine acquire respective input information and process and display the input information, no data interaction exists between the black screen and the all-in-one machine, and specific steps are not repeated here.
The control method is convenient to understand, and the acquisition and analysis of the writing information of the user of the black screen and the all-in-one machine can also be regarded as a writing functional module. Virtual keys may also be understood as virtual menus or the like.
When a user has a playing requirement, the video file with writing, image and audio stored on the all-in-one machine can be played, or the video file can be copied and shared. In the video file recorded by the intelligent blackboard system in the embodiment, the all-in-one machine can be read, and the writing information is secondarily edited by using the all-in-one machine physical peripheral and the virtual function module so as to meet the requirement of correcting or updating the user; therefore, compared with the teaching image files in the existing mode, the teaching files generated by the intelligent blackboard system are higher in utilization rate, the workload of teachers is reduced, meanwhile, the video files contain image information and audio information of teachers and students, the teaching quality of teachers is convenient to evaluate, and the teaching quality can be further improved according to on-site feedback of students.
The above description is only a preferred embodiment of the present patent and is not intended to limit the present patent, and various modifications and changes may be made to the present patent by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present patent shall be included in the protection scope of the present patent.
Claims (5)
1. The utility model provides an integrative intelligent comprehensive screen blackboard system of recorded broadcast which characterized in that: the system comprises an audio acquisition module, at least one video acquisition module, an all-in-one machine and at least one black screen; black screens are arranged on both sides of the display of the all-in-one machine; the display of the all-in-one machine can be split into a plurality of display areas with the number not less than that of the black screens, and an independent display area on the display of the all-in-one machine corresponds to each black screen; the black screen, the audio acquisition module and the video acquisition module are electrically connected with the all-in-one machine;
the audio acquisition module is used for acquiring an audio signal of a user and outputting the audio signal to the all-in-one machine;
the video acquisition module is used for acquiring image signals in the system installation environment and outputting the image signals to the all-in-one machine;
a black screen for displaying the user's writing pad and displaying the updated writing pad in response to the user's operation; meanwhile, the writing board and the operation information of the user are output to the integrated machine in the same screen mode;
the all-in-one machine is used for displaying the black screen writing board in the same screen mode or independently displaying the writing board of the all-in-one machine in the split screen mode, simultaneously displaying the image signal acquired by the video acquisition module, and storing the picture of the display of the all-in-one machine and the audio signal from the audio acquisition module in real time;
the black screen and the all-in-one machine are electrically connected in a USB mode.
2. The recording and broadcasting integrated intelligent comprehensive screen blackboard system as claimed in claim 1, wherein: the operation information of the user on the black screen comprises virtual key input information, when the information is collected by the black screen, the information is output to the all-in-one machine, the all-in-one machine analyzes the information to form a corresponding functional module, then the updated writing information is displayed on the display by the response functional module, meanwhile, a data packet corresponding to the functional module is sent to the black screen, and the updated writing information is displayed by the response functional module after the functional module is analyzed by the black screen.
3. The recording and broadcasting integrated intelligent comprehensive screen blackboard system as claimed in claim 1, wherein: the black screen comprises a writing touch area, the writing touch area comprises a writing area and a virtual key area, and the virtual key area is arranged on the edge of the writing area.
4. The recording and broadcasting integrated intelligent comprehensive screen blackboard system as claimed in claim 3, wherein: the black screen further comprises a physical key area, and the physical key area is arranged along the outer edge of the writing touch control area.
5. The recording and broadcasting integrated intelligent comprehensive screen blackboard system as claimed in any one of claims 1, 3 and 4, wherein: the black screen and the all-in-one machine are arranged side by side and detachably connected.
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| CN202110767647.7A CN113504852A (en) | 2018-10-26 | 2018-11-29 | Control method of recording and broadcasting integrated intelligent comprehensive screen blackboard system |
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| CN202110767647.7A Division CN113504852A (en) | 2018-10-26 | 2018-11-29 | Control method of recording and broadcasting integrated intelligent comprehensive screen blackboard system |
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| CN109509375A CN109509375A (en) | 2019-03-22 |
| CN109509375B true CN109509375B (en) | 2021-07-23 |
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| CN201910567550.4A Pending CN110362228A (en) | 2018-10-26 | 2019-06-27 | A kind of unlimited writing on the blackboard method and its system based on liquid crystal blackboard |
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| CN110362228A (en) | 2019-10-22 |
| WO2020083042A1 (en) | 2020-04-30 |
| CN110471640B (en) | 2023-03-31 |
| CN109542008B (en) | 2022-08-09 |
| CN210348836U (en) | 2020-04-17 |
| CN109377789A (en) | 2019-02-22 |
| WO2020083041A1 (en) | 2020-04-30 |
| CN109509375A (en) | 2019-03-22 |
| CN110473433B (en) | 2022-04-19 |
| CN109597598A (en) | 2019-04-09 |
| CN209879763U (en) | 2019-12-31 |
| CN110471640A (en) | 2019-11-19 |
| CN110473433A (en) | 2019-11-19 |
| CN113504852A (en) | 2021-10-15 |
| CN109542008A (en) | 2019-03-29 |
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