An intelligent writing board system capable of automatically saving blackboard writing

Abstract

The present invention discloses an intelligent writing board system capable of automatically saving blackboard writing. The intelligent writing board capable of realizing blackboard writing display and pressure-resistance conversion is composed of a thick color-coated paint panel, a flexible pressure sensing array and a base support layer. The flexible pressure sensing array is based on piezoresistive resistors. The present invention gives full play to the teaching advantages of electronic courseware and traditional writing boards, and realizes automatic saving, transmission, printing, etc. of blackboard writing content. It saves students' time for taking notes in class, increases students' learning efficiency, and provides new ideas for the writing board teaching mode.

Description

Technical Field

[0001] The invention relates to a flexible sensing technology and a novel teaching aid, in particular to an intelligent writing board system capable of realizing automatic storage of blackboard writing. Background Art

[0002] With the development of the times, the traditional teaching mode has begun to change, and electronic courseware has gradually replaced traditional blackboard writing. However, compared with PPT lectures, in actual teaching, the teacher's blackboard writing is also very important. As an important part of classroom teaching, blackboard writing can not only attract students' attention, but also play a good demonstration role and increase students' memory. However, the biggest problem with the blackboard is that the teacher's blackboard writing cannot be automatically saved. Students need to take notes in real time during the lecture, which leads to the loss of classroom thinking time.

[0003] Therefore, it is extremely necessary to realize the automatic saving of blackboard writing, which can not only retain the advantages of blackboard teaching, but also combine the advantages of repeated saving of electronic courseware.

[0004] Thin film flexible sensing technology has the advantages of being ultra-thin, stretchable, and compliant to pressure. It can use micro-nano processing technologies such as screen printing / photolithography to achieve a high-density flexible pressure sensing array. Therefore, thin film flexible sensing technology provides a technical approach for the preparation of smart writing boards. Summary of the invention

[0005] Purpose of the invention: In order to solve the problem that the existing blackboard writing cannot be saved, the purpose of the present invention is to provide an intelligent writing board system that can realize automatic saving of blackboard writing. This writing board can timely identify and save the content of the writing on the writing board through a high-density flexible sensing array, and can be used as a classroom blackboard without taking up students' class time to record notes.

[0006] The present invention discloses an intelligent writing board system capable of automatically saving blackboard writing, comprising an intelligent writing board, a controller, a power supply and a storage module; the intelligent writing board and the storage module are respectively connected to the controller, and the power supply supplies power to the intelligent writing board, the controller and the storage module;

[0007] Among them, the smart writing board is used for writing display, and the writing pressure signal is converted into a voltage signal and sent to the controller. The controller determines the writing pressure position according to the pressure signal and converts it into a digital signal and saves it in the storage module; the storage template can realize functions such as handwriting storage, export, printing and transmission.

[0008] Furthermore, the smart writing board includes a writing board body, a flexible pressure sensing array and a base support layer arranged in sequence; the flexible pressure sensing array is used to sense the pressure of the writing position, thereby restoring the content; wherein the thin film flexible pressure sensing array includes an upper electrode layer, a row selector, a pressure-sensitive layer, a column selector and a lower electrode layer arranged in sequence. The pressure-sensitive layer is divided into M rows and N columns, the row selector is connected to the M rows of the pressure-sensitive layer, and the column selector is connected to the N columns of the pressure-sensitive layer.

[0009] The working principle of the pressure sensor array is that when pressure is applied to the pressure sensing unit, the vertical structure of the pressure-sensitive layer changes, the conductivity increases, the resistance decreases, and the voltage decreases. Two-dimensional voltage information can be obtained through the row selector and column selector, so that the pressure position of all voltage reductions can be determined.

[0010] Furthermore, the writing board body is a thick color-coated baking varnish panel in green or black. The surface of the thick color-coated baking varnish panel is used for writing.

[0011] Furthermore, the upper electrode layer and the lower electrode layer both include a polymer substrate and a conductive wire on the polymer substrate, and the silver conductive wire is prepared by micro-nano processing techniques such as screen printing or photolithography; the polymer substrate may be polyimide or the like; the conductive wire may be a nano-conductive material such as gold, silver, copper or graphene;

[0012] Furthermore, the pressure-sensitive layer is a pressure-sensitive polymer composite material, such as a zinc oxide pressure-sensitive composite material, and the upper electrode layer and the lower electrode layer are in electrical contact with the interface formed by the pressure-sensitive layer.

[0013] Furthermore, the base support layer is a galvanized sheet and / or a corrugated paperboard, which serves as a support structure of the smart writing board.

[0014] Furthermore, the controller determines the writing pressure position according to the pressure signal and converts it into a digital signal and stores it in the storage module. The specific process is as follows:

[0015] Step 1: The controller reads the voltage of each row and column in the pressure-sensitive layer in turn through the row selector and the column selector. The voltage data of the mth row and the nth column in the pressure-sensitive layer is V gmn Indicates, where m = 1, 2, 3 ... M, n = 1, 2, 3 ... N;

[0016] For the m-row n-column position, that is, the position of the m-th row and n-th column in the pressure-sensitive layer, the m-th row selector, the n-th column selector and the region position R of the m-th row and n-th column in the pressure-sensitive layer are gmn , and a fixed resistor R0, form a resistor circuit, powered by a power supply, so the voltage formula for the m row and n column position is:

[0017]

[0018] Step 2: Set the voltage value V at the position of row m and column n in the pressure-sensitive layer gmn Compared with the voltage threshold, when there is writing pressure, the voltage value of the row and column bits in the pressure-sensitive layer corresponding to the writing bit becomes smaller. When the voltage value of the row and column bits in the pressure-sensitive layer corresponding to the pressure bit is less than the voltage threshold, the pressure bit is recorded as 1, otherwise it is recorded as 0; forming a two-dimensional pressure information frame at the current time T;

[0019] Step 3, repeat steps 1-2, obtain each two-dimensional pressure information frame in the time period of T to T+t and superimpose them, the superposition algorithm is as follows;

[0020]

[0021] Step 4: Save the written content in image format according to the digital color mapping relationship.

[0022] In the digital color mapping relationship, 1 represents black and 0 represents white.

[0023] Beneficial effects: The intelligent writing board system provided by the present invention can realize automatic storage of blackboard writing, automatic storage, transmission, printing, etc. of blackboard writing content, which can save students' time of taking notes in class and increase learning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the system of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the intelligent writing board of the present invention;

[0026] Figure 3 It is a schematic diagram of a voltage detection circuit for the m-row and n-column positions of the pressure-sensitive layer;

[0027] Figure 4 Schematic diagram of the present invention or superposition algorithm

[0028] Figure 5 A schematic diagram of the algorithm for deriving the blackboard writing content of the present invention;

[0029] Among them, 1. panel; 2. flexible pressure sensing array; 3. substrate support layer; 201. row selector; 202. upper electrode layer; 203. pressure-sensitive layer; 204. column selector; 205. lower electrode layer. DETAILED DESCRIPTION

[0030] The present invention will be further explained below in conjunction with the accompanying drawings.

[0031] like Figure 1 As shown, an intelligent writing board system capable of automatically saving blackboard writing includes an intelligent writing board controller, a power supply and a storage module.

[0032] The smart writing board is used for writing display, and converts the writing pressure signal into a voltage signal and sends it to the controller. The controller determines the writing pressure position according to the pressure signal and converts it into a digital signal and saves it in the storage module. The power supply is the function of the entire smart writing board system, and the storage template can realize the functions of handwriting storage, export, printing and transmission.

[0033] Smart writing board structure Figure 2 As shown, it is composed of a thick color-coated paint panel 1, a flexible pressure sensing array 2 and a base support layer 3.

[0034] The thin film flexible pressure sensing array 2 includes an upper electrode layer 202 , a row selector 201 , a pressure-sensitive layer 203 , a column selector 204 and a lower electrode layer 205 in sequence.

[0035] The thick color-coated baking varnish panel is a common writing board material, and its color is green;

[0036] The upper and lower electrode layers 205 are made of silver conductive wires prepared by screen printing on a polyimide substrate;

[0037] The pressure-sensitive layer 203 is a pressure-sensitive zinc oxide pressure-sensitive composite material;

[0038] When pressure is applied to an area of ​​the panel 1, the vertical structure of the pressure-sensitive layer 203 corresponding to the area changes, the conductivity increases, and the resistance decreases. Therefore, the controller controls the row and column selectors 204 to measure the pressure, and the resistance of the area corresponding to the pressure will decrease.

[0039] The base support layer 3 is a galvanized sheet;

[0040] Among them, in the smart writing board, the thick color-coated paint panel 1 provides normal writing and drawing. The thin film flexible pressure sensing array 2 is used to record the handwriting, so as to restore the content. The base support layer 3 is used as the support structure of the smart writing board.

[0041] Taking the letter "T" writing recognition as an example, the specific process of the proposed intelligent writing board system to save the blackboard content is described:

[0042] Step 1: The controller reads the voltage of each row and column in the pressure-sensitive layer 203 in sequence through the row selector 201 and the column selector 204. The voltage data of the mth row and the nth column in the pressure-sensitive layer 203 is V gmn The controller controls the row selector 201 and the column selector 204 to convert the resistance information of the smart writing board into digital voltage information, wherein the voltage detection circuit of the mth row and the nth column in the pressure-sensitive layer 203 is as shown in FIG. Figure 3 As shown, the specific voltage calculation formula for the m-row and n-column bit area of ​​the pressure-sensitive layer is:

[0043]

[0044] Step 2: The voltage value V gmn Compared with the voltage threshold, when there is writing pressure, the voltage value of the row and column bit in the pressure-sensitive layer 203 corresponding to the writing bit becomes smaller. When the voltage value of the row and column bit in the pressure-sensitive layer 203 corresponding to the pressure bit is less than the voltage threshold, the pressure bit is recorded as 1, otherwise it is recorded as 0; forming a two-dimensional pressure information frame at the current time T;

[0045] Step 3, repeat steps 1-2, obtain each two-dimensional pressure information frame in the time period of T to T+t and superimpose them, the superposition algorithm is as follows;

[0046]

[0047] Taking the letter "T" as an example, writing can be divided into two parts. Multiple two-dimensional pressure information frames are obtained within a period of time. For each two-dimensional pressure information frame, the two-dimensional change of pressure information can be realized according to the set voltage pressure threshold. Among them, if the pressure is less than the threshold, it is considered that there is handwriting on the blackboard; if the pressure is greater than the pressure threshold, it is 0, and it is considered that there is no handwriting on the blackboard.

[0048] Through multiple two-dimensional pressure information frames or superposition algorithms, the "horizontal" stroke of the letter "T" can be recognized. Similarly, the "vertical" stroke of the letter "T" can be recognized. Therefore, two two-dimensional pressure information frames can be obtained, corresponding to the "horizontal" and "vertical" strokes of the letter "T" respectively. Then, through the superposition algorithm again, the content on the information frame can be superimposed to obtain the letter "T". The implementation process is as follows: Figure 4 The discrimination algorithm is as follows:

[0049]

[0050] Step 4: According to the digital color mapping relationship, save the blackboard content as a picture format, so as to realize the graphical preservation of the letter "T". This provides functions such as printing and transmission. The implementation process is as follows Figure 5 The discrimination algorithm is as follows:

[0051]

Claims

1. An intelligent writing board system capable of automatically saving blackboard writing, characterized in that: It includes an intelligent writing board, a controller, a power supply and a storage module; The intelligent writing board and the storage module are connected to the controller respectively, and the power supply supplies power to the intelligent writing board, the controller and the storage module; Among them, the smart writing board is used for writing display, and the writing pressure signal is converted into a voltage signal and sent to the controller. The controller determines the writing pressure position according to the pressure signal and converts it into a digital signal and saves it in the storage module; The intelligent writing board includes a writing board body, a flexible pressure sensing array and a base support layer which are arranged in sequence; The thin film flexible pressure sensing array includes an upper electrode layer, a row selector, a pressure-sensitive layer, a column selector and a lower electrode layer which are arranged in sequence; the pressure-sensitive layer is divided into M rows and N columns, the row selector is connected to the M rows of the pressure-sensitive layer, and the column selector is connected to the N columns of the pressure-sensitive layer; The controller determines the writing pressure position according to the pressure signal and converts it into a digital signal and stores it in the storage module. The specific process is as follows: Step 1: The controller reads the voltage of each row and column in the pressure-sensitive layer in turn through the row selector and the column selector. The voltage data of the mth row and the nth column in the pressure-sensitive layer is V gmn Indicates, where m = 1, 2, 3 ... M, n = 1, 2, 3 ... N; Step 2: Set the voltage value V at the position of row m and column n in the pressure-sensitive layer gmn Compared with the voltage threshold, when there is writing pressure, the voltage value of the row and column bits in the pressure-sensitive layer corresponding to the writing bit becomes smaller. When the voltage value of the row and column bits in the pressure-sensitive layer corresponding to the pressure bit is less than the voltage threshold, the pressure bit is recorded as 1, otherwise it is recorded as 0; forming a two-dimensional pressure information frame at the current time T; Step 3, repeat steps 1-2, obtain each two-dimensional pressure information frame in the time period of T to T+t and superimpose them, the superposition algorithm is as follows; Step 4: Save the written content in image format according to the digital color mapping relationship.

2. According to claim 1, a smart writing board system capable of automatically saving blackboard writing is characterized in that: The writing board body is a thick color-coated baking varnish panel.

3. According to claim 1, a smart writing board system capable of automatically saving blackboard writing is characterized in that: The upper electrode layer and the lower electrode layer both include a high molecular polymer substrate and a conductive line on the high molecular polymer substrate.

4. According to claim 1, a smart writing board system capable of automatically saving blackboard writing is characterized in that: The pressure-sensitive layer is a polymer composite material that is sensitive to pressure.

5. According to claim 1, a smart writing board system capable of automatically saving blackboard writing is characterized in that: In the digital color mapping relationship, 1 represents black and 0 represents white.

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