CN114442900A - Display device and learning effect acquisition method - Google Patents

Display device and learning effect acquisition method Download PDF

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Publication number
CN114442900A
CN114442900A CN202210105983.XA CN202210105983A CN114442900A CN 114442900 A CN114442900 A CN 114442900A CN 202210105983 A CN202210105983 A CN 202210105983A CN 114442900 A CN114442900 A CN 114442900A
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touch
processor
content
learning effect
display device
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石海宁
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Shanghai Chengzhang Information Technology Co ltd
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Shanghai Chengzhang Information Technology Co ltd
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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]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
    • G06F3/04883—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures for inputting data by handwriting, e.g. gesture or text
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/95—Retrieval from the web
    • G06F16/953—Querying, e.g. by the use of web search engines
    • G06F16/9535—Search customisation based on user profiles and personalisation
    • 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
    • G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
    • 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
    • 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
    • G09B5/02—Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip
    • 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
    • G09B7/00—Electrically-operated teaching apparatus or devices working with questions and answers

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Databases & Information Systems (AREA)
  • Human Computer Interaction (AREA)
  • Business, Economics & Management (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • Data Mining & Analysis (AREA)
  • Electrically Operated Instructional Devices (AREA)
  • User Interface Of Digital Computer (AREA)

Abstract

The invention discloses a display device and a learning effect acquisition method, wherein the display device comprises a shell, a touch display screen, a sensor module, a processor and a communication module, wherein the touch display screen is arranged on the front surface of the shell, and the sensor module is used for acquiring the use state of a user when the touch display screen displays reading content; the processor is used for acquiring learning effect data of the reading content through the use state; the communication module is used for uploading the learning effect data to a server. The display device and the learning effect acquisition method can acquire the reading effect and the learning effect of the user, so that parents and teachers can acquire the reading concentration degree of students, master the learning state of the students and provide help for the students to learn.

Description

Display device and learning effect acquisition method
Technical Field
The invention relates to a display device and a learning effect acquisition method.
Background
The electronic book reader is a novel digital reader which adopts LCD and electronic paper as a display screen and can read electronic books with most formats on the internet, such as PDF, CHM, TXT and the like. Display technology, electronic reading products providing a paper-like reading experience.
The online lesson is a new learning mode, and is a series learning course which is provided for learners and takes the internet as a platform, and the content comprises video, pictures, characters and the like.
The web lesson is an online learning course provided by the service organization. Different from off-line class professors, the online class has the advantages of various modes, flexibility, convenience and the like, and more student groups and parents of children are used.
The existing electronic reading material reader or the network course software can not obtain the reading state of the user.
Disclosure of Invention
The invention aims to overcome the defect that an electronic reading reader or online lesson software in the prior art cannot acquire the reading state of a user, and provides a display device and a learning effect acquisition method which can acquire the reading effect and the learning effect of the user, so that parents and teachers can acquire the reading concentration of students, master the learning state of the students and provide help for the students to learn.
The invention solves the technical problems through the following technical scheme:
a display device comprises a shell, a touch display screen, a sensor module, a processor and a communication module, wherein the touch display screen is arranged on the front surface of the shell,
the sensor module is used for acquiring the use state of a user when the touch display screen displays reading content;
the processor is used for acquiring learning effect data of the reading content through the use state;
the communication module is used for uploading the learning effect data to a server.
Preferably, the display device is a reader, the sensor module includes a camera, the camera is used for shooting a face image of a user when the touch display screen displays reading content, and the processor is used for acquiring learning effect data of the user on the reading content through the face image.
Preferably, the display device is a reader, the sensor module is configured to acquire a touch signal transmitted by the touch display screen when the touch display screen displays reading content and acquire an operation mode of the user on the reading content according to the touch signal, and the processor is configured to acquire learning effect data of the user according to the operation mode.
Preferably, the processor is configured to obtain a display content image of a current interface when the touch display screen displays reading content, and obtain display content in the display content image by using image recognition, where the display content includes a number of characters, a proportion of images, a number of formulas, and a proportion of tables, the processor is further configured to obtain a preset operation corresponding to the current interface according to the display content, and the processor is further configured to compare the preset operation with the operation mode to obtain learning effect data of a user.
Preferably, the learning effect data includes a concentration value of each reading interface, the processor is configured to determine whether the display content includes a target content, determine whether a target touch gesture is included in the touch signal if the display content includes the target content, and set the concentration value of the current interface to a high value if the display content includes the target content, where for a reading page, the larger the number of characters and the number of formulas, the lower the touch frequency in the preset operation is, the target touch gesture is an amplification gesture when the target content is an image, and the target touch gesture is a linear sliding gesture at a position of the characters or the table when the target content is the characters or the table.
Preferably, the reading content is a problem or a test paper problem,
the sensor module is used for acquiring a touch signal transmitted by the touch display screen when the touch display screen displays reading content and acquiring the position of a question currently operated by a user according to the touch signal;
the processor is used for displaying a calculation white board in a matching area, and the matching area is a half area of the title outside a half area where the current interface is located;
the sensor module is also used for acquiring a question position and a touch signal of the calculation whiteboard position when a touch display screen displays reading contents, and acquiring an operation mode of a user on the question according to the touch signal;
and the processor acquires the learning effect data of the user on the question according to the operation mode of the question.
Preferably, the learning effect data further comprises problem solving efficiency,
the processor is used for identifying and obtaining subjects of exercises or test paper questions through images and obtaining answer suggestion time of the subjects according to the subjects and the questions;
and the processor acquires the problem solving efficiency and the concentration degree value of the user on the question according to the operation mode of the question and the question answering and suggesting time, wherein the more the receiving times of the touch signals in the suggesting time, the higher the concentration degree value.
Preferably, the display device is a reader, the sensor module includes an acceleration sensor, the acceleration sensor is used for acquiring a motion state of the display device when the touch display screen displays the reading content, and the processor is used for acquiring learning effect data of the user on the reading content through the motion state.
Preferably, the display device is a reader, the sensor module includes a camera and an acceleration sensor, the learning effect data includes concentration value of each reading interface,
the sensor module is used for collecting a touch signal transmitted by the touch display screen when the touch display screen displays reading content;
the processor acquires the touch frequency of the current interface according to the touch signal and judges whether the touch frequency is in a preset range, if so, the processor acquires the learning effect data of the user according to the touch frequency, and if not, the processor acquires the motion state acquired by the acceleration sensor;
the processor is further used for judging whether the display device is in a static state or not according to the motion state, if not, judging that the concentration degree value of the current interface is a low value, and if so, calling the camera to shoot the image;
the processor is further used for judging whether a face image exists in the shot image, if so, the concentration degree value of the current interface is judged to be a high value, and if not, the acquisition of the learning effect data is suspended until a next touch signal is acquired.
The invention also provides a learning effect acquisition method, which acquires the learning effect data of the user through the display device.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
the display device and the learning effect acquisition method can acquire the reading effect and the learning effect of the user, so that parents and teachers can acquire the reading concentration of students, master the learning state of the students and provide help for the students to learn.
Drawings
Fig. 1 is a flowchart of a learning effect acquisition method according to embodiment 1 of the present invention.
Fig. 2 is another flowchart of the learning effect obtaining method according to embodiment 1 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment provides a display device, which can be a tablet computer, a desktop computer, a notebook computer and an e-reader.
In this embodiment, the display device is an electronic reader.
The display device comprises a shell, a touch display screen, a sensor module, a processor and a communication module, wherein the touch display screen is arranged on the front surface of the shell,
the sensor module is used for acquiring the use state of a user when the touch display screen displays reading content;
the processor is used for acquiring learning effect data of the reading content through the use state;
the communication module is used for uploading the learning effect data to a server.
After the learning effect data are uploaded to the server, the learning effect data can be checked by teachers and parents, learning states are obtained, and relevant electronic books are recommended according to learning effects.
The learning effect data in this embodiment includes high and low concentration degrees, a time length of the user before the display device, an interaction frequency with the display device, and the like, and according to the information, the learning state, the rating, and the like of the user can be obtained by processing the big data.
The display device is a reader, the sensor module comprises a camera, the camera is used for shooting a face image of a user when the touch display screen displays reading content, and the processor is used for acquiring learning effect data of the user on the reading content through the face image.
The camera can be used for capturing the face image of the user and the direction of the human eye annotation, and the learning effect data of the user can be obtained according to the time length of the face in front of the display device and the direction of the human eye annotation.
Further, the sensor module is used for collecting a touch signal transmitted by the touch display screen when the touch display screen displays reading content and acquiring an operation mode of the reading content by a user according to the touch signal, and the processor is used for acquiring learning effect data of the user according to the operation mode.
In this embodiment, the learning effect data is acquired by using the camera, and the learning effect data is acquired by using the touch display screen.
If the electronic reading materials are used, the time length of reading of the user can be collected by using the touch display screen, and the page turning frequency of the user can also be collected.
The camera can be used for collecting the reading time of the user and the attention direction of human eyes.
Specifically, the processor is used for acquiring a display content image under a current interface when the touch display screen displays reading content, and acquiring display content in the display content image by utilizing image recognition, wherein the display content comprises the number of characters, the proportion of images, the number of formulas and the proportion of tables, the processor is further used for acquiring preset operation corresponding to the current interface according to the display content, and the processor is further used for comparing the preset operation and the operation mode to acquire learning effect data of a user.
The content typesetting of the electronic reading can be obtained through character recognition, the time that a user needs to spend is deduced according to the proportion of the number of characters and the number of formulas, the time that the user needs to pay can be a time period, and the time period beyond which the user needs to pay is considered as poor learning effect.
The learning effect data comprises concentration numerical values of each reading interface, the processor is used for judging whether the display content comprises target content, if so, judging whether the touch signal comprises a target touch gesture, and if so, setting the concentration numerical value of the current interface as a high numerical value;
for a reading page, the larger the number of characters and the number of formulas, the lower the touch frequency in the preset operation, when the target content is an image, the target touch gesture is an amplification gesture, and when the target content is a character or a table, the target touch gesture is a linear sliding gesture of the position of the character or the table.
Further, the reading content is a problem or a test paper problem.
The sensor module is used for acquiring a touch signal transmitted by the touch display screen when the touch display screen displays reading content and acquiring the position of a question currently operated by a user according to the touch signal;
the processor is used for displaying a calculation white board in a matching area, and the matching area is a half area of the title outside a half area where the current interface is located;
the sensor module is also used for acquiring a question position and a touch signal of the calculation whiteboard position when a touch display screen displays reading content, and acquiring an operation mode of a user for the question according to the touch signal;
and the processor acquires the learning effect data of the user on the topic according to the operation mode of the topic.
The learning effect data further includes problem solving efficiency,
the processor is used for identifying and obtaining subjects of exercises or test paper questions through images and obtaining the answering suggestion time of the subjects according to the subjects and the questions;
and the processor acquires the problem solving efficiency and the concentration degree value of the user on the question according to the operation mode of the question and the question answering and suggesting time, wherein the more the receiving times of the touch signals in the suggesting time, the higher the concentration degree value.
Generally, each question of the exercise or the test paper has corresponding time, for example, how long the choice question should be taken, and how long the big question should be taken, the application can record the answering time, efficiency and accuracy of each question.
Furthermore, the sensor module comprises an acceleration sensor, the acceleration sensor is used for collecting the motion state of the display device when the touch display screen displays the reading content, and the processor is used for acquiring the learning effect data of the user on the reading content through the motion state.
The learning effect data includes a concentration value for each reading interface,
the sensor module is used for collecting a touch signal transmitted by the touch display screen when the touch display screen displays reading content;
the processor acquires the touch frequency of the current interface according to the touch signal and judges whether the touch frequency is in a preset range, if so, the processor acquires the learning effect data of the user according to the touch frequency, and if not, the processor acquires the motion state acquired by the acceleration sensor;
the processor is further used for judging whether the display device is in a static state or not according to the motion state, if not, judging that the concentration degree value of the current interface is a low value, and if so, calling the camera to shoot the image;
the processor is further used for judging whether a face image exists in the shot image, if so, the concentration degree value of the current interface is judged to be a high value, and if not, the acquisition of the learning effect data is suspended until a next touch signal is acquired.
Referring to fig. 1, with the display device, the embodiment further provides a learning effect obtaining method, including:
step 100, the sensor module collects the use state of a user when the touch display screen displays reading content;
step 101, the processor acquires learning effect data of the reading content through the use state;
and 102, uploading the learning effect data to a server by the communication module.
Specifically, in step 100, the camera shoots a face image of the user when the touch display screen displays the reading content, and the processor is configured to obtain the learning effect data of the user on the reading content through the face image.
Further, in step 100, the sensor module collects a touch signal transmitted by the touch display screen when the touch display screen displays the reading content and obtains an operation mode of the reading content by the user according to the touch signal, and the processor is configured to obtain learning effect data of the user according to the operation mode.
Specifically, step 101 includes:
step 1011, the processor acquires a display content image under the current interface when the touch display screen displays the reading content;
step 1012, acquiring display content in the display content image by using image recognition;
the display content comprises the number of characters, the proportion of images, the number of formulas and the proportion of tables.
Step 1013, the processor acquires a preset operation corresponding to the current interface according to the display content;
and 1014, comparing the preset operation with the operation mode by the processor to acquire the learning effect data of the user.
The learning effect data comprises a concentration degree value of each reading interface, and the learning effect obtaining method comprises the following steps:
the processor judges whether the display content comprises target content, if so, judges whether the touch signal comprises a target touch gesture, and if so, sets the concentration degree value of the current interface to be a high value.
For a reading page, the larger the number of characters and the number of formulas, the lower the touch frequency in the preset operation, when the target content is an image, the target touch gesture is an amplification gesture, and when the target content is a character or a table, the target touch gesture is a linear sliding gesture of the position of the character or the table.
Further, the reading content is a problem or a test paper problem, and the learning effect obtaining method includes:
the sensor module collects a touch signal transmitted by a touch display screen when the touch display screen displays reading content and acquires the position of a question currently operated by a user according to the touch signal;
the processor displays a calculation white board in a matching area, wherein the matching area is a half area of the title outside a half area where the current interface is located;
the sensor module collects a question position and a touch signal of the calculation whiteboard position when a touch display screen displays reading content, and acquires an operation mode of a user on the question according to the touch signal;
and the processor acquires the learning effect data of the user on the question according to the operation mode of the question.
The learning effect data further comprises problem solving efficiency, and the learning effect obtaining method comprises the following steps:
the processor acquires the subject of the exercise or the test paper through image identification, and acquires the question answering suggestion time of the subject according to the subject and the question;
and the processor acquires the problem solving efficiency and the concentration degree value of the user on the question according to the operation mode of the question and the question answering and suggesting time, wherein the more the receiving times of the touch signals in the suggesting time, the higher the concentration degree value.
Further, the display device is a reader, the sensor module includes an acceleration sensor, in step 100, the acceleration sensor collects a motion state of the display device when the touch display screen displays the reading content, and the processor acquires learning effect data of the user on the reading content through the motion state.
Referring to fig. 2, the display device is a reader, the sensor module includes a camera and an acceleration sensor, the learning effect data includes a concentration value of each reading interface, and the learning effect obtaining method includes:
200, the sensor module collects a touch signal transmitted by a touch display screen when the touch display screen displays reading content;
step 201, the processor acquires a touch frequency of a current interface according to the touch signal and judges whether the touch frequency is in a preset range, if so, step 202 is executed, and if not, step 203 is executed;
step 202, acquiring learning effect data of a user according to the touch frequency, and then executing step 210;
step 203, acquiring a motion state acquired by an acceleration sensor;
step 204, the processor determines whether the display device is in a static state according to the motion state, if not, step 205 is executed, and if so, step 206 is executed.
Step 205, judging that the concentration degree value of the current interface is a low value, recording the value in the learning effect data, and then executing step 210;
step 206, calling the camera to shoot images;
step 207, the processor determines whether a face image exists in the shot image, if so, step 208 is executed, otherwise, step 209 is executed;
step 208, judging that the concentration degree value of the current interface is a high value, recording the value in the learning effect data, and then executing step 210;
step 209, suspending the acquisition of the learning effect data until the next touch signal is acquired, and then executing step 200.
And step 210, the communication module uploads the learning effect data to a server.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (10)

1. A display device comprises a shell, a touch display screen, a sensor module, a processor and a communication module, wherein the touch display screen is arranged on the front surface of the shell,
the sensor module is used for acquiring the use state of a user when the touch display screen displays reading content;
the processor is used for acquiring learning effect data of the reading content through the use state;
the communication module is used for uploading the learning effect data to a server.
2. The display device according to claim 1, wherein the display device is a reader, the sensor module includes a camera, the camera is configured to capture a face image of a user when the reading content is displayed on the touch display screen, and the processor is configured to obtain learning effect data of the user on the reading content through the face image.
3. The display device according to claim 1, wherein the display device is a reader, the sensor module is configured to acquire a touch signal transmitted by the touch display screen when the touch display screen displays reading content and acquire an operation mode of the reading content by a user according to the touch signal, and the processor is configured to acquire learning effect data of the user according to the operation mode.
4. The display device according to claim 3, wherein the processor is configured to obtain a display content image of a current interface when the touch display screen displays reading content, and obtain the display content in the display content image by using image recognition, where the display content includes a number of characters, a proportion of images, a number of formulas, and a proportion of tables, and the processor is further configured to obtain a preset operation corresponding to the current interface according to the display content, and the processor is further configured to compare the preset operation with the operation manner to obtain learning effect data of a user.
5. The display device as claimed in claim 4, wherein the learning effect data includes a concentration value of each reading interface, the processor is configured to determine whether the display content includes a target content, determine whether a target touch gesture is included in the touch signal if the display content includes the target content, and set the concentration value of the current interface to a high value if the display content includes the target content, and for a reading page, the higher the number of characters and the number of formulas is, the lower the touch frequency in the preset operation is, the target touch gesture is an enlargement gesture when the target content is an image, and the target touch gesture is a linear sliding gesture at a position of a character or a table when the target content is a character or a table.
6. The display device according to claim 3, wherein the reading contents are exercises or test paper questions,
the sensor module is used for acquiring a touch signal transmitted by the touch display screen when the touch display screen displays reading content and acquiring the position of a question currently operated by a user according to the touch signal;
the processor is used for displaying a calculation white board in a matching area, and the matching area is a half area of the title outside a half area where the current interface is located;
the sensor module is also used for acquiring a question position and a touch signal of the calculation whiteboard position when a touch display screen displays reading content, and acquiring an operation mode of a user for the question according to the touch signal;
and the processor acquires the learning effect data of the user on the question according to the operation mode of the question.
7. The display device according to claim 6, wherein the learning effect data further includes problem solving efficiency,
the processor is used for identifying and obtaining subjects of exercises or test paper questions through images and obtaining the answering suggestion time of the subjects according to the subjects and the questions;
and the processor acquires the problem solving efficiency and the concentration degree value of the user on the question according to the operation mode of the question and the question answering and suggesting time, wherein the more the receiving times of the touch signals in the suggesting time, the higher the concentration degree value.
8. The display device according to claim 1, wherein the display device is a reader, the sensor module includes an acceleration sensor, the acceleration sensor is configured to acquire a motion state of the display device when the touch display screen displays the reading content, and the processor is configured to acquire the learning effect data of the user on the reading content through the motion state.
9. The display device of claim 1, wherein the display device is a reader, the sensor module comprises a camera and an acceleration sensor, the learning effect data comprises a concentration value of each reading interface,
the sensor module is used for collecting a touch signal transmitted by the touch display screen when the touch display screen displays reading content;
the processor acquires the touch frequency of the current interface according to the touch signal and judges whether the touch frequency is in a preset range, if so, the processor acquires the learning effect data of the user according to the touch frequency, and if not, the processor acquires the motion state acquired by the acceleration sensor;
the processor is further used for judging whether the display device is in a static state or not according to the motion state, if not, judging that the concentration degree value of the current interface is a low value, and if so, calling the camera to shoot the image;
the processor is further used for judging whether a face image exists in the shot image, if so, the concentration degree value of the current interface is judged to be a high value, and if not, the acquisition of the learning effect data is suspended until a next touch signal is acquired.
10. A learning effect acquisition method characterized by acquiring learning effect data of a user through the display device according to any one of claims 1 to 9.
CN202210105983.XA 2022-01-28 2022-01-28 Display device and learning effect acquisition method Pending CN114442900A (en)

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