CN212685063U

CN212685063U - Push-pull multimedia teaching blackboard

Info

Publication number: CN212685063U
Application number: CN202020314055.0U
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: 2021-03-12
Anticipated expiration: 2030-03-13

Abstract

The utility model discloses a plug-type multimedia teaching blackboard, including an at least clipboard and an at least mutual movable plate, mutual movable plate 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 apply on a surface of writing panel, backlight unit sets up in one side that liquid crystal display panel carried on the back in the touch-control membrane mutually, still be provided with a transparent dielectric medium plate between touch-control membrane and the liquid crystal display panel, backlight unit further includes base plate, LED lamp area, light guide plate, membrane and reflection paper that all shines, 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 plug-type multimedia teaching blackboard has both practiced thrift the cost, can attenuate the thickness of equipment again, optimize the user experience of product, still conveniently in maintenance and the change to liquid crystal display panel, reduces the cost of maintenance.

Description

Push-pull multimedia teaching blackboard

Technical Field

The utility model relates to a plug-type multimedia teaching blackboard 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. 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. For example, the inhalation of the air tube in the chalk dust generated during writing and wiping can cause discomfort of the nose, the pharynx and the throat, and lung cancer is more likely to be caused under the environment for a long time. Although "dust-free" chalk is also available on the market, in practical application, the pollution reduction effect on the chalk dust is not very obvious.

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 plug-type multimedia teaching blackboard, this plug-type multimedia teaching blackboard both practiced thrift the cost, can attenuate the thickness of equipment again, optimize the user experience of product, still convenient in maintenance and the change to liquid crystal display panel, reduce the cost of maintenance.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a push-pull multimedia teaching blackboard 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 lower end of the supporting strip is provided with a first flanging part which is bent back to one side opposite to the light guide plate, the lower surface of the first flanging part is in contact with the surface of the substrate, the first flanging part is fixedly connected with the substrate, and the supporting strip is an aluminum supporting strip;

the light guide plate is characterized in that the left side and the right side of the light guide plate are respectively provided with a pressing strip, one end of the pressing strip is arranged on the base plate, the other end of the pressing strip is in contact connection with the light equalizing film on the light guide plate, the pressing strip is perpendicular to the supporting strip, two ends of the pressing strip are in contact connection with two ends of the supporting strip respectively, a protruding part is arranged at the joint of the pressing strip and the supporting strip or the joint of the supporting strip and the pressing strip, a concave part matched with the protruding part is arranged at the joint of the supporting strip and the pressing strip or the joint of the pressing strip and the supporting strip, and the protruding part is embedded into the concave;

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 buffer strip is a foam buffer strip or a silica gel buffer strip.

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 upper end of the supporting bar is provided with a second flanging part which is bent towards one side of the light guide plate, and the lower surface of the second flanging part is in contact connection with the light-equalizing film above the light guide plate.

7. In the above scheme, the touch film is connected with the writing panel in an adhesive manner.

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 plug-type multimedia teaching blackboard, the lower extreme of its support bar has the first turn-ups portion of bending back to one side of light guide plate earlier on, the lower surface of this first turn-ups portion and the surface contact of base plate and this first turn-ups portion and base plate fixed connection, the support bar is the aluminium support bar, through the setting of aluminium support bar and its first turn-ups portion, can be with the heat of LED lamp area lasting, quick transfer to large tracts of land base plate, realized producing quick, the even heat dissipation of heat to LED lamp area, avoid using the equipment of backlight unit of this invention, like the touch-control blackboard influences other device performances because the heat dissipation is not smooth, can also reduce the use of other heat dissipation modules simultaneously, not only practiced thrift the cost, but also can thin the thickness of equipment, optimize the user experience of product; furthermore, the upper end of the supporting bar is provided with a second flanging part bent towards one side of the light guide plate, the lower surface of the second flanging part is in contact connection with the light equalizing film above the light guide plate, and the supporting bar is enabled to have the effect of limiting the light guide plate and the optical diaphragm at the same time through the arrangement of the second flanging part, so that the positioning of the light guide plate and the optical diaphragm is realized under the condition of not increasing any cost, and the production efficiency is improved.

2. The utility model relates to a push-pull type multimedia teaching blackboard, the left and right sides of a light guide plate of which are respectively provided with a pressing bar, one end of the pressing bar is arranged on a base plate, the other end of the pressing bar is in contact connection with a light equalizing film on the light guide plate, the pressing bar is vertically arranged with a supporting bar, and the two ends of the pressing bar are respectively in contact connection with the two ends of the supporting bar, the joint of the pressing bar and the supporting bar or the joint of the supporting bar and the pressing bar is provided with a convex part, the joint of the supporting bar and the pressing bar or the joint of the pressing bar and the supporting bar is provided with a concave part matched with the convex part, the convex part is embedded into the concave part, so that the pressing bar is matched and connected with the supporting bar, the arrangement of the pressing bar provides positioning for the light guide plate, the light equalizing film and the reflecting paper, prevents the deviation in the vertical direction from affecting the, the light of the LED element can be effectively prevented from being scattered from the joint of the pressing strip and the supporting strip, the luminous intensity and stability of the light source are ensured, and the display effect of equipment using the backlight module is further ensured.

3. The utility model discloses plug-type multimedia teaching blackboard, it peels off liquid crystal display panel from traditional LCD, and assembles it as independent module with writing panel, touch membrane through the apron, cooperates with the backlight unit, just can realize touch-control and display operation, has simplified the flow of production, is convenient for process, 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.

4. The utility model discloses plug-type multimedia teaching blackboard, one side surface that its 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 hard contact between dielectric plate and the fixed block, the protection dielectric plate, still for the expend with heat and contract with cold of dielectric plate under the influence of environmental factor provides the adaptability space, make the dielectric plate can not freely realize expend with heat and contract with cold by external force restriction, thereby guarantee the stability of dielectric plate materialization nature, prolong the life of dielectric plate.

5. The utility model discloses plug-type multimedia teaching blackboard, it is located the apron middle part of the medium plate left and right sides has decurrent bulge strip, and this bulge strip is located between fixed block and the liquid crystal display panel and is close to liquid crystal display panel's one end, 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 multimedia teaching blackboard of the present invention;

FIG. 2 is a schematic structural view of a backlight module in the push-pull multimedia teaching blackboard of the present invention;

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

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

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

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

figure 7 is a side view of the local structure of the push-pull multimedia teaching blackboard of the utility model II.

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; 6b1, a first flanging part; 6b2, second flanging part; 7b, a diffusion film; 8b, a brightness enhancement film; 10b, pressing strips; 13b, a boss; 14b, a recess.

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 multimedia teaching blackboard 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;

the lower end of the supporting strip 6b is provided with a first flanging part 6b1 bent towards one side opposite to the light guide plate 3b, the lower surface of the first flanging part 6b1 is in contact with the surface of the substrate 1b, the first flanging part 6b1 is fixedly connected with the substrate 1b, and the supporting strip 6b is an aluminum supporting strip;

the left side and the right side of the light guide plate 3b are respectively provided with a pressing strip 10b, one end of the pressing strip 10b is installed on the base plate 1b, the other end of the pressing strip 10b is in contact connection with the light homogenizing film 4b on the light guide plate 3b, the pressing strip 10b is perpendicular to the supporting strip 6b, two ends of the pressing strip 10b are respectively in contact connection with two ends of the supporting strip 6b, a protruding part 13b is arranged at the joint of the pressing strip 10b and the supporting strip 6b or the joint of the supporting strip 6b and the pressing strip 10b, a concave part 14b matched with the protruding part 13b is arranged at the joint of the supporting strip 6b and the pressing strip 10b or the joint of the pressing strip 10b and the supporting strip 6b, and the protruding part 13b is embedded into the concave part 14b, so that the pressing strip 10b is;

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 buffer strip 8a is a foam buffer strip; the cushion layer 9a is a foam cushion layer.

Example 2: a push-pull multimedia teaching blackboard 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 strip 8a is a silica gel buffer strip; the buffer layer 9a is a silica gel buffer layer; the upper end of the supporting strip 6b is provided with a second flanging part 6b2 bent towards one side of the light guide plate 3b, and the lower surface of the second flanging part 6b2 is in contact connection with the light-equalizing film 4b above the light guide plate 3 b; the touch film 2a is bonded to the writing panel 1 a.

When the push-pull multimedia teaching blackboard is adopted, the aluminum support bars and the first flanging parts of the aluminum support bars can continuously and quickly transfer the heat of the LED lamp strip to a large-area substrate, so that the heat generated by the LED lamp strip can be quickly and uniformly radiated, the influence on the performance of other devices caused by the unsmooth radiation of equipment using the backlight module, such as a touch blackboard, can be avoided, meanwhile, the use of other radiating modules can be reduced, the cost is saved, the thickness of the equipment can be reduced, and the user experience of products can be optimized; furthermore, the second flanging parts are arranged, so that the supporting strips have the function of limiting the light guide plate and the optical diaphragm at the same time, the positioning of the light guide plate and the optical diaphragm is realized under the condition of not increasing any cost, and the production efficiency is improved;

in addition, the arrangement of the pressing strip provides positioning for the light guide plate, the light homogenizing film and the reflecting paper, so that the light homogenizing effect is prevented from being influenced by the deviation in the vertical direction, and the protruding parts or the recessed parts on the pressing strip and the recessed parts or the protruding parts on the supporting strip are arranged in a matched manner, so that the light of the LED element can be effectively prevented from being emitted from the connecting part of the pressing strip and the supporting strip, the luminous intensity and the stability of a light source are ensured, and the display effect of equipment using the backlight module is further 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-pull multimedia teaching blackboard 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);

the lower end of the supporting strip (6 b) is provided with a first flanging part (6 b 1) which is bent towards one side opposite to the light guide plate (3 b), the lower surface of the first flanging part (6 b 1) is in contact with the surface of the substrate (1 b), the first flanging part (6 b 1) is fixedly connected with the substrate (1 b), and the supporting strip (6 b) is an aluminum supporting strip;

the left and right sides of light guide plate (3 b) is provided with a layering (10 b) respectively, and the one end of this layering (10 b) is installed on base plate (1 b), the other end of layering (10 b) is connected with the contact of light homogenizing membrane (4 b) on light guide plate (3 b), layering (10 b) and support bar (6 b) set up perpendicularly, and the both ends of layering (10 b) are connected with the both ends contact of support bar (6 b) respectively, the junction of layering (10 b) and support bar (6 b) perhaps the junction of support bar (6 b) and layering (10 b) is provided with a bellying (13 b), the junction of support bar (6 b) and layering (10 b) perhaps the junction of layering (10 b) and support bar (6 b) has a depressed part (14 b) that matches with bellying (13 b), bellying (13 b) imbeds in depressed part (14 b), the pressing strips (10 b) are matched and connected with the supporting strips (6 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 multimedia teaching blackboard according to 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 multimedia teaching blackboard according to 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 multimedia teaching blackboard according to 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 multimedia teaching blackboard according to claim 1, wherein: the buffer strip (8 a) is a foam buffer strip or a silica gel buffer strip.

6. A push-pull multimedia teaching blackboard according to claim 1, wherein: the buffer layer (9 a) is a foam buffer layer or a silica gel buffer layer.

7. A push-pull multimedia teaching blackboard according to claim 1, wherein: the upper end of the supporting strip (6 b) is provided with a second flanging part (6 b 2) which is bent towards one side of the light guide plate (3 b), and the lower surface of the second flanging part (6 b 2) is in contact connection with the light homogenizing film (4 b) above the light guide plate (3 b).

8. A push-pull multimedia teaching blackboard according to claim 1, wherein: the touch control film (2 a) is connected with the writing panel (1 a) in an adhesive mode.