CN213458473U

CN213458473U - Push-pull electronic blackboard for multimedia teaching

Info

Publication number: CN213458473U
Application number: CN202020313100.0U
Authority: CN
Inventors: 刘泽江; 牛立军
Original assignee: Suzhou Youen Information Technology Co ltd
Current assignee: Suzhou Youen Information Technology Co ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2021-06-15
Anticipated expiration: 2030-03-13

Abstract

The utility model discloses a push-and-pull electronic blackboard for multimedia teaching, including an at least clipboard and an at least interactive board, interactive board is including writing panel, touch-control membrane, liquid crystal display panel and backlight unit, the touch-control membrane is located between writing panel and the liquid crystal display panel and pastes and applies on writing panel's a surface, backlight unit further includes base plate, LED lamp area, light guide plate, the membrane of lighting and reflection paper, reflection paper is located between base plate and the light guide plate, the left and right sides edge of light guide plate is opened respectively has the first installation through-hole of a plurality of, still includes an at least fly leaf, is provided with linear guide and at least one interval distribution's movable block between the up end of this fly leaf and the frame up end. The utility model discloses a push-and-pull electronic blackboard for multimedia teaching can prevent effectively that the relative skew takes place to influence the light effect of evening because of the transportation between light guide plate and all kinds of blooming, set up the condition such as collision, guarantees the display effect of blackboard.

Description

Push-pull electronic blackboard for multimedia teaching

Technical Field

The utility model relates to a push-and-pull electronic blackboard for multimedia teaching belongs to education and equips technical field.

Background

Teaching lessons in the form of chalk used in conjunction with a blackboard has long been a very important position in the field of education. The teaching aid has the advantage of low teaching cost, and the teacher can draw the lecture of the sound and drawing colors and the image graphic representation or explanation on the blackboard, so that the attention of students can be greatly improved, and the learning efficiency is improved.

However, with the development of science and technology and the deeper understanding of some diseases, the disadvantages of the traditional chalk teaching are also gradually paid more attention. In addition, in the campus nowadays, multimedia classrooms and electronic blackboards are common, wherein the general components of the multimedia classrooms include a multimedia computer, a liquid crystal projector, a projection screen, an audio device and the like. During actual teaching, a multimedia computer is used for displaying pre-prepared teaching materials through projection of a projector, and meanwhile, the cooperation of sound and man-machine interaction operation between a user and the computer are added according to needs to complete the teaching or training process. It can be seen that the multimedia teaching apparatus in the prior art also has some drawbacks, such as: the multimedia equipment is more, and a projector, a projection screen and the like need to be independently equipped; the projection screen is generally white and can not be used in an environment with bright light; the function is single, and the expansibility is avoided. The existing electronic blackboard is usually integrated with the display screen as a whole into the blackboard, which is not beneficial to the weight reduction, thinning and installation of the weight of the blackboard.

Disclosure of Invention

The utility model aims at providing a push-and-pull electronic blackboard for multimedia teaching, this a push-and-pull electronic blackboard for multimedia teaching can prevent effectively that the relative skew takes place to influence the light-equalizing effect because of the transportation between light guide plate and all kinds of blooming, set up the condition such as collision, guarantees the display effect of blackboard.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a push-pull electronic blackboard for multimedia teaching comprises at least one writing board and at least one interactive board, wherein the writing board and the interactive board are respectively installed and fixed through respective outer frame frames;

the interactive board comprises a writing panel, a touch control film, a liquid crystal panel and a backlight module, wherein the touch control film is positioned between the writing panel and the liquid crystal panel and is pasted on one surface of the writing panel;

the periphery outer sides of the medium plate and the liquid crystal panel are respectively provided with a plurality of fixed blocks, the fixed blocks are fixed at the periphery edges of the writing panel or the touch control film, the periphery outer sides of the medium plate and the liquid crystal panel are respectively provided with a cover plate connected with the fixed blocks, one side of the cover plate is connected with the fixed blocks, and the other side of the cover plate is connected with the periphery edges of the medium plate and the liquid crystal panel in a pressing way;

the surface of one side, close to the dielectric plate, of the fixed block is connected with a buffer strip used for being in contact with the side face of the dielectric plate, the middle parts of the cover plates positioned on the left side and the right side of the dielectric plate are provided with downward convex strip parts, the convex strip parts are positioned between the fixed block and the liquid crystal panel and close to one end of the liquid crystal panel, and buffer layers are arranged between the convex strip parts and the dielectric plate and between the convex strip parts and the liquid crystal panel;

the backlight module further comprises a substrate, an LED lamp strip, a light guide plate, a light homogenizing film and reflecting paper, wherein the reflecting paper is positioned between the substrate and the light guide plate, the light homogenizing film is positioned on the surface of one side of the light guide plate opposite to the substrate, the LED lamp strip is respectively arranged on the upper side and the lower side of the light guide plate and is respectively arranged on the substrate through a supporting strip;

the LED lamp strip comprises a plurality of LED elements and a circuit board, the LED elements are arranged on the surface of one side of the circuit board at equal intervals, the surface of the other side of the circuit board is connected with the supporting strips in an adhesive mode, and one side of the circuit board provided with the LED elements is arranged face to face with the side surface of the light guide plate;

the LED lamp strip is characterized by also comprising at least two adjusting plates, wherein the adjusting plates are arranged between the substrate and the reflecting paper, so that the LED elements of the LED lamp strip are aligned with the light guide plate in the vertical direction;

the light guide plate is provided with a plurality of first mounting through holes at the edges of the left side and the right side respectively, a substrate positioned right below the light guide plate is provided with a second mounting through hole corresponding to the first mounting through hole, and the light homogenizing film and the reflecting paper are provided with through holes corresponding to the first mounting through hole and the second mounting through hole respectively;

the movable frame is characterized by further comprising at least one movable plate, a linear guide rail and at least one movable block which is distributed at intervals are arranged between the upper end face of the movable plate and the upper end face of the outer frame, and the linear guide rail is embedded into the movable block or the movable block is embedded into the linear guide rail.

The further improved scheme in the technical scheme is as follows:

1. in the scheme, the diffusion film and the brightness enhancement film are stacked above the light-homogenizing film.

2. In the above solution, an elastic cushion layer is arranged between the lower surface of the cover plate and the upper surface of the liquid crystal panel.

3. In the above scheme, the four cover plates are respectively connected with the fixing block through a screw.

4. In the above scheme, the fixed block is fixedly bonded with the touch control film through the double faced adhesive tape.

5. In the above scheme, the buffer layer is a foam buffer layer or a silica gel buffer layer.

6. In the above scheme, the number of regulating plates is 3, and the regulating plates are respectively positioned at the upper edge and the lower edge of the substrate and at the middle part of the substrate.

7. In the above scheme, the regulating plate is an acrylic regulating plate.

8. In the above scheme, the first mounting through hole is slightly larger than the second mounting through hole.

9. In the above scheme, a stud is embedded in the second mounting through hole, and the stud sequentially passes through the through hole in the reflective paper, the first mounting through hole and the through hole in the light-equalizing film.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:

1. the utility model discloses a push-and-pull electronic blackboard for multimedia teaching, it is provided with two at least regulating plates, this regulating plate sets up between base plate and reflection paper, make LED component and the light guide plate in LED lamp area align the setting in the vertical direction, through the setting of regulating plate, can guarantee that the light that the LED component sent jets into the light guide plate all the time from the light guide plate side center, thereby guarantee the light uniformity nature of light guide plate and light-equalizing membrane to the side income light source, make the dispersion of light source more even and stable, further guarantee to use the backlight module of the invention to have good display effect; in addition, the edges of the left side and the right side of the light guide plate are respectively provided with a plurality of first mounting through holes, the substrate positioned right below the light guide plate is provided with second mounting through holes corresponding to the first mounting through holes, the light homogenizing film and the reflecting paper are respectively provided with through holes corresponding to the first mounting through holes and the second mounting through holes, the light guide plate, the light homogenizing film and the reflecting paper can be further fixed with the substrate in a pairing way through the arrangement of the through holes, the light homogenizing effect is prevented from being influenced by the relative offset between the light guide plate and various optical films in the horizontal direction, and the display effect of the backlight module device is further ensured; furthermore, the mounting and fixing strength and stability of the light guide plate, the light equalizing film and the reflecting paper which are locked with the substrate are enhanced through the adjusting plate, the light equalizing effect is further prevented from being influenced by relative offset between the light guide plate and various optical films due to the conditions of transportation, setting collision and the like, and the display effect of the backlight module device is ensured.

2. The utility model discloses a push-and-pull electronic blackboard for multimedia teaching, it peels off liquid crystal display panel from traditional LCD to assemble into independent module through the apron with writing panel, touch-control membrane, cooperates backlight unit, just can realize touch-control and display operation, has simplified the flow of production, the processing of being convenient for, very big improvement production efficiency, saving manufacturing cost; meanwhile, the deformation of the dielectric plate and the liquid crystal panel under the influence of environmental factors can be reduced, so that the display definition and the touch precision are improved, and the user experience is good; furthermore, the liquid crystal panel is convenient to maintain and replace, the replacement of the liquid crystal panel cannot generate adverse effects on other components such as the touch control film, and the cost of maintenance is reduced.

3. The utility model discloses a push-and-pull electronic blackboard for multimedia teaching, it states that one side surface that the fixed block is close to the dielectric plate is connected with one and is used for the buffering strip with the side contact of dielectric plate, the setting of buffering strip, both can prevent the hard contact between dielectric plate and the fixed block, the protection dielectric plate, still provide adaptability space for the expend with heat and contract with cold of dielectric plate under the influence of environmental factor, make the dielectric plate can not receive the external force restriction freedom to realize expend with heat and contract with cold, thereby guarantee the stability of dielectric plate materialization nature, the life of extension dielectric plate.

4. The utility model discloses a push-and-pull blackboard for multimedia teaching, it is located the apron middle part of the medium plate left and right sides has a decurrent bulge strip, and this bulge strip is located between fixed block and the liquid crystal display panel and is close to the one end of liquid crystal display panel, and the setting of apron bulge strip both can strengthen the physical properties and the mechanical strength of apron under the condition that does not increase apron thickness, improves the stability to liquid crystal display panel, medium plate installation, can play good limiting displacement to liquid crystal display panel again, can not restrict the free expend with heat and contract with cold of medium plate simultaneously.

Drawings

FIG. 1 is a schematic structural view of a push-pull electronic blackboard for multimedia teaching according to the present invention;

FIG. 2 is a schematic view of the structure of a backlight module in a push-pull electronic blackboard according to the present invention;

FIG. 3 is a side view of the local structure of the push-pull electronic blackboard for multimedia teaching of the present invention;

FIG. 4 is a side view of the backlight module in the push-pull electronic blackboard of the present invention;

FIG. 5 is a side view of the backlight module in the push-pull electronic blackboard of the present invention;

FIG. 6 is a top view of a partial structure of a backlight module of the push-pull electronic blackboard according to the present invention;

figure 7 is a side view of the local structure of the push-pull electronic blackboard for multimedia teaching of the present invention.

In the above drawings: 1. a writing board; 2. an interactive plate; 3. an outer frame; 4. a movable plate; 5. a linear guide rail; 6. a movable block; 1a, a writing panel; 2a, a touch control film; 3a, a dielectric plate; 4a, a liquid crystal panel; 5a, fixing blocks; 6a, a cover plate; 6a1, raised strip; 7a, a screw; 8a, a buffer strip; 9a, a buffer layer; 10a, a backlight module; 1b, a substrate; 2b, an LED lamp strip; 2b1, LED element; 2b2, circuit board; 3b, a light guide plate; 4b, a light homogenizing film; 5b, reflective paper; 6b, supporting strips; 7b, a diffusion film; 8b, a brightness enhancement film; 9b, an adjusting plate; 11b, a first mounting through hole; 12b, second mounting through holes.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1: a push-pull electronic blackboard for multimedia teaching comprises at least one writing board 1 and at least one interactive board 2, wherein the writing board 1 and the interactive board 2 are respectively installed and fixed through respective outer frame frames 3;

the interactive plate 2 comprises a writing panel 1a, a touch film 2a, a liquid crystal panel 4a and a backlight module 10a, wherein the touch film 2a is positioned between the writing panel 1a and the liquid crystal panel 4a and is pasted on one surface of the writing panel 1a, the backlight module 10a is arranged on one side, opposite to the touch film 2a, of the liquid crystal panel 4a, and a transparent dielectric plate 3a is also arranged between the touch film 2a and the liquid crystal panel 4 a;

a plurality of fixing blocks 5a are respectively arranged on the outer sides of the peripheries of the dielectric plate 3a and the liquid crystal panel 4a, the fixing blocks 5a are fixed at the edges of the peripheries of the writing panel 1a or the touch control film 2a, cover plates 6a connected with the fixing blocks 5a are respectively arranged on the outer sides of the peripheries of the dielectric plate 3a and the liquid crystal panel 4a, one side of each cover plate 6a is connected with the corresponding fixing block 5a, and the other side of each cover plate 6a is connected with the edges of the peripheries of the dielectric plate 3a and the liquid crystal panel 4a in a pressing;

a buffer strip 8a used for contacting with the side surface of the dielectric plate 3a is connected on the surface of one side of the fixed block 5a close to the dielectric plate 3a, a downward convex strip part 6a1 is arranged in the middle of the cover plate 6a positioned on the left side and the right side of the dielectric plate 3a, the convex strip part 6a1 is positioned between the fixed block 5a and the liquid crystal panel 4a and close to one end of the liquid crystal panel 4a, and buffer layers 9a are arranged between the convex strip part 6a1 and the dielectric plate 3a and between the convex strip part and the liquid crystal panel 4 a;

the backlight module 10a further comprises a substrate 1b, an LED strip 2b, a light guide plate 3b, a light-equalizing film 4b and a piece of reflective paper 5b, wherein the reflective paper 5b is located between the substrate 1b and the light guide plate 3b, the light-equalizing film 4b is located on a side surface of the light guide plate 3b opposite to the substrate 1b, and the LED strip 2b is respectively arranged on the upper side and the lower side of the light guide plate 3b and is respectively mounted on the substrate 1b through a supporting strip 6 b;

the LED lamp strip 2b comprises a plurality of LED elements 2b1 and a circuit board 2b2, the LED elements 2b1 are mounted on one side surface of the circuit board 2b2 at equal intervals, the other side surface of the circuit board 2b2 is connected with a supporting strip 6b in an adhering mode, and one side of the circuit board 2b2 on which the LED elements 2b1 are mounted is arranged in a face-to-face mode with the side surface of the light guide plate 3 b;

at least two adjusting plates 9b are further arranged, and the adjusting plates 9b are arranged between the substrate 1b and the reflecting paper 5b, so that the LED elements 2b1 of the LED strip 2b and the light guide plate 3b are aligned in the vertical direction, that is, the central lines of the LED elements and the light guide plate are on the same plane;

the edges of the left side and the right side of the light guide plate 3b are respectively provided with a plurality of first mounting through holes 11b, the substrate 1b positioned right below the light guide plate 3b is provided with second mounting through holes 12b corresponding to the first mounting through holes 11b, and the light homogenizing film 4b and the reflecting paper 5b are respectively provided with through holes corresponding to the first mounting through holes 11b and the second mounting through holes 12 b;

the movable frame is characterized by further comprising at least one movable plate 4, a linear guide rail 5 and at least one movable block 6 which is distributed at intervals are arranged between the upper end face of the movable plate 4 and the upper end face of the outer frame 3, and the linear guide rail 5 is embedded into the movable block 6 or the movable block 6 is embedded into the linear guide rail 5.

A diffusion film 7b and a brightness enhancement film 8b are stacked above the light uniformizing film 4 b; an elastic cushion layer is arranged between the lower surface of the cover plate 6a and the upper surface of the liquid crystal panel 4 a; the four cover plates 6a are respectively connected with the fixed block 5a through screws 7 a; the fixed block 5a is fixedly bonded with the touch control film 2a through a double-sided adhesive tape; the cushion layer 9a is a foam cushion layer.

Example 2: a push-pull electronic blackboard for multimedia teaching comprises at least one writing board 1 and at least one interactive board 2, wherein the writing board 1 and the interactive board 2 are respectively installed and fixed through respective outer frame frames 3;

The buffer layer 9a is. A silica gel buffer layer; the number of the adjusting plates 9b is 3, and the adjusting plates are respectively positioned at the upper edge and the lower edge of the base plate 1b and in the middle of the base plate 1 b; the adjusting plate 9b is an acrylic adjusting plate; the first mounting through hole 11b is slightly larger than the second mounting through hole 12 b; a stud is embedded in the second mounting through hole 12b and sequentially penetrates through the through hole in the reflecting paper 5b, the first mounting through hole 11b and the through hole in the light-equalizing film 4 b.

When the push-pull electronic blackboard for multimedia teaching is adopted, the light rays emitted by the LED elements can be ensured to be always emitted into the light guide plate from the center of the side surface of the light guide plate through the arrangement of the adjusting plate, so that the light uniformity of the light source entering the light guide plate and the light-equalizing film is ensured, the light source is more uniformly dispersed and stable, and the backlight module provided by the invention is further ensured to have a good display effect; in addition, through the arrangement of each through hole, the light guide plate, the light equalizing film, the reflecting paper and the substrate can be further fixed in a paired mode, the light equalizing effect is prevented from being influenced by relative offset between the light guide plate and various optical films in the horizontal direction, and the display effect of the backlight module equipment is further ensured; furthermore, the mounting and fixing strength and stability of the light guide plate, the light equalizing film and the reflecting paper which are locked with the substrate are enhanced through the adjusting plate, the light equalizing effect is further prevented from being influenced by relative offset generated by transportation, arrangement collision and other conditions between the light guide plate and various optical films, and the display effect of the backlight module equipment is ensured;

in addition, the liquid crystal panel is stripped from the traditional liquid crystal display, and is assembled into an independent module together with the writing panel and the touch film through the cover plate, and the touch and display operation can be realized by matching with the backlight module, so that the production flow is simplified, the processing is convenient, the production efficiency is greatly improved, and the production cost is saved; meanwhile, the deformation of the dielectric plate and the liquid crystal panel under the influence of environmental factors can be reduced, so that the display definition and the touch precision are improved, and the user experience is good; furthermore, the liquid crystal panel is convenient to maintain and replace, the replacement of the liquid crystal panel cannot generate adverse effects on other components such as a touch control film and the like, and the maintenance cost is reduced;

in addition, the arrangement of the buffer strips can prevent the medium plate from being in hard contact with the fixed block, protect the medium plate and provide an adaptive space for expansion with heat and contraction with cold of the medium plate under the influence of environmental factors, so that the medium plate can freely realize expansion with heat and contraction with cold without being limited by external force, thereby ensuring the stability of the physical and chemical properties of the medium plate and prolonging the service life of the medium plate;

in addition, the arrangement of the convex strip part of the cover plate can enhance the physical property and the mechanical strength of the cover plate under the condition of not increasing the thickness of the cover plate, improve the installation stability of the liquid crystal panel and the dielectric plate, play a good limiting role in the liquid crystal panel and simultaneously can not limit the free expansion and contraction of the dielectric plate.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A push-and-pull electronic blackboard for multimedia teaching is characterized in that: the writing board comprises at least one writing board (1) and at least one interactive board (2), wherein the writing board (1) and the interactive board (2) are respectively installed and fixed through respective outer frame frames (3);

the interactive plate (2) comprises a writing panel (1 a), a touch film (2 a), a liquid crystal panel (4 a) and a backlight module (10 a), wherein the touch film (2 a) is positioned between the writing panel (1 a) and the liquid crystal panel (4 a) and is pasted on one surface of the writing panel (1 a), the backlight module (10 a) is arranged on one side, opposite to the touch film (2 a), of the liquid crystal panel (4 a), and a transparent dielectric plate (3 a) is further arranged between the touch film (2 a) and the liquid crystal panel (4 a);

the periphery outer sides of the dielectric plate (3 a) and the liquid crystal panel (4 a) are respectively provided with a plurality of fixing blocks (5 a), the fixing blocks (5 a) are fixed at the periphery edges of the writing panel (1 a) or the touch control film (2 a), the periphery outer sides of the dielectric plate (3 a) and the liquid crystal panel (4 a) are respectively provided with a cover plate (6 a) connected with the fixing blocks (5 a), one side of the cover plate (6 a) is connected with the fixing blocks (5 a), and the other side of the cover plate is connected with the periphery edges of the dielectric plate (3 a) and the liquid crystal panel (4 a) in a pressing mode;

one side surface of the fixed block (5 a), which is close to the dielectric plate (3 a), is connected with a buffer strip (8 a) which is used for contacting with the side surface of the dielectric plate (3 a), the middle parts of the cover plates (6 a) positioned at the left side and the right side of the dielectric plate (3 a) are provided with a downward convex strip part (6 a 1), the convex strip part (6 a 1) is positioned between the fixed block (5 a) and the liquid crystal panel (4 a) and is close to one end of the liquid crystal panel (4 a), and buffer layers (9 a) are respectively arranged between the convex strip part (6 a 1) and the dielectric plate (3 a) and between the convex strip part and the liquid crystal panel (4 a);

the backlight module (10 a) further comprises a substrate (1 b), an LED lamp strip (2 b), a light guide plate (3 b), a light homogenizing film (4 b) and reflecting paper (5 b), wherein the reflecting paper (5 b) is positioned between the substrate (1 b) and the light guide plate (3 b), the light homogenizing film (4 b) is positioned on the surface of one side, back to the substrate (1 b), of the light guide plate (3 b), the LED lamp strip (2 b) is respectively arranged on the upper side and the lower side of the light guide plate (3 b) and is respectively installed on the substrate (1 b) through a supporting strip (6 b);

the LED lamp strip (2 b) comprises a plurality of LED elements (2 b 1) and a circuit board (2 b 2), the LED elements (2 b 1) are mounted on one side surface of the circuit board (2 b 2) at equal intervals, the other side surface of the circuit board (2 b 2) is connected with the supporting bar (6 b) in an adhering mode, and one side of the circuit board (2 b 2) provided with the LED elements (2 b 1) is arranged in a face-to-face mode with the side surface of the light guide plate (3 b);

at least two adjusting plates (9 b) are further arranged, and the adjusting plates (9 b) are arranged between the base plate (1 b) and the reflecting paper (5 b) so that the LED elements (2 b 1) of the LED lamp strip (2 b) and the light guide plate (3 b) are aligned in the vertical direction;

the edge of the left side and the edge of the right side of the light guide plate (3 b) are respectively provided with a plurality of first mounting through holes (11 b), a substrate (1 b) positioned right below the light guide plate (3 b) is provided with second mounting through holes (12 b) corresponding to the first mounting through holes (11 b), and the light homogenizing film (4 b) and the reflecting paper (5 b) are respectively provided with through holes corresponding to the first mounting through holes (11 b) and the second mounting through holes (12 b);

the movable frame is characterized by further comprising at least one movable plate (4), a linear guide rail (5) and at least one movable block (6) distributed at intervals are arranged between the upper end face of the movable plate (4) and the upper end face of the outer frame (3), and the linear guide rail (5) is embedded into the movable block (6) or the movable block (6) is embedded into the linear guide rail (5).

2. A push-pull electronic blackboard for multimedia teaching as claimed in claim 1, wherein: and a diffusion film (7 b) and a brightness enhancement film (8 b) are stacked above the light uniformizing film (4 b).

3. A push-pull electronic blackboard for multimedia teaching as claimed in claim 1, wherein: an elastic cushion layer is arranged between the lower surface of the cover plate (6 a) and the upper surface of the liquid crystal panel (4 a).

4. A push-pull electronic blackboard for multimedia teaching as claimed in claim 1, wherein: the four cover plates (6 a) are respectively connected with the fixed block (5 a) through screws (7 a).

5. A push-pull electronic blackboard for multimedia teaching as claimed in claim 1, wherein: the fixed block (5 a) is fixedly bonded with the touch control film (2 a) through a double-sided adhesive tape.

6. A push-pull electronic blackboard for multimedia teaching as claimed in claim 1, wherein: the buffer layer (9 a) is a foam buffer layer or a silica gel buffer layer.

7. A push-pull electronic blackboard for multimedia teaching as claimed in claim 1, wherein: the number of the adjusting plates (9 b) is 3, and the adjusting plates are respectively positioned at the upper edge and the lower edge of the base plate (1 b) and in the middle of the base plate (1 b).

8. A push-pull electronic blackboard for multimedia teaching as claimed in claim 1, wherein: the adjusting plate (9 b) is an acrylic adjusting plate.

9. A push-pull electronic blackboard for multimedia teaching as claimed in claim 1, wherein: the first mounting through hole (11 b) is slightly larger than the second mounting through hole (12 b).

10. A push-pull electronic blackboard for multimedia teaching as claimed in claim 1, wherein: a stud is embedded in the second mounting through hole (12 b), and the stud sequentially penetrates through the through hole in the reflecting paper (5 b), the first mounting through hole (11 b) and the through hole in the light homogenizing film (4 b).