Liquid crystal screen with shockproof function

Abstract

The present invention discloses a liquid crystal screen with a shockproof function, and the present invention relates to the technical field of liquid crystal screens. After the liquid crystal screen is fixed to the shell of a display, under the impact force of vibration, the connection position cannot be buffered due to the pressure under the vibration, causing the connection position to be worn or broken, causing the liquid crystal screen to loosen after the vibration. The liquid crystal screen with a shockproof function, through the adaptation of the rubber arc strip and the arc surface of the slide plate, during the vibration process, through the rubber deformation characteristics of the rubber arc strip, when the vibration impact occurs, the impact force is buffered by deformation, and at the same time, the sliding installation between the connecting slide frame and the slide plate is coordinated to provide a buffering and shockproof effect, while avoiding vibration offset, causing the connection position with the display shell to be broken after vibration, or the liquid crystal screen and the display shell to be misaligned.

Description

Technical Field

[0001] The invention relates to the technical field of liquid crystal screens, in particular to a liquid crystal screen with a shockproof function. Background Art

[0002] At present, the LCD screen is a liquid crystal display screen. It uses liquid crystal materials as basic components and uses the physical properties of liquid crystals to control the transmission and blocking of light to achieve image display. Liquid crystal is a type of substance with special properties. It maintains the unique crystal characteristic of being able to be arranged in three-dimensional space in a certain range in a liquid state. When voltage is applied to the LCD screen, the arrangement direction of the liquid crystal molecules will change. The light that was originally twisted 90 degrees by the liquid crystal molecules will no longer be twisted after the liquid crystal molecules are rearranged vertically, thereby changing the propagation path of the light. By controlling the voltage of different pixel points, the liquid crystal molecules can be rotated at different positions and times, achieving precise control of light, and finally displaying various images and texts on the screen;

[0003] After the LCD screen is fixed to the display housing, under the impact of vibration, the connection position cannot be buffered due to the pressure under the vibration, causing the connection position to wear or break, causing the LCD screen to loosen after the vibration. Summary of the invention

[0004] To achieve the above purpose, the present invention is implemented by the following technical scheme: a liquid crystal screen with shockproof function, comprising:

[0005] A backlight module, which is used to provide light source for image display on the liquid crystal screen;

[0006] A liquid crystal module, which is used to control the arrangement direction of liquid crystal molecules by rotating the light emitted by the backlight module through liquid crystal under voltage, thereby realizing the control of light transmission and blocking to display different images, and the liquid crystal module is fixedly installed with the backlight module;

[0007] An outer frame assembly, which is used to wrap the backlight module and the liquid crystal module, and is connected and fixed to the display housing through the outer frame assembly;

[0008] Wherein, the outer frame assembly comprises an outer support frame, and a slide plate is fixedly installed on the upper and lower sides of the outer support frame, and column grooves are symmetrically opened on both sides of the slide plate, and a side of the slide plate away from the outer support frame is an arc surface recessed inwardly from the center position, and sliders are slidably installed at the column grooves of the slide plate, and the slide plate is slidably installed to connect the slide frame through the slider, and a rubber arc strip is fixedly installed on the side of the connected slide frame close to the arc surface of the slide plate, and the side of the rubber arc strip close to the slide plate is an arc surface convex outwardly from the center position, and the arc surface of the rubber arc strip is adapted to the arc surface of the slide plate, and through the adaptation of the rubber arc strip and the arc surface of the slide plate, during the vibration process Through the rubber deformation characteristics of the rubber arc strip, the impact force is buffered by deformation during vibration impact, and at the same time, the sliding installation between the connecting slide frame and the slide slot plate is cooperated to provide a buffering and shockproof effect while avoiding vibration offset, which causes a break in the connection position with the display shell after vibration, or a misalignment between the LCD screen and the display shell. Both ends of the connecting slide frame away from the side of the external support frame are provided with a hole plate, and the LCD screen is fixedly connected to the shell of the display through the hole plate. The inner wall of the external support frame is fixedly installed with an inner buckle plate, and the inner buckle plate is symmetrically installed along the center position of the axis of the external support frame. The external support frame is clamped with the liquid crystal module and the backlight module through the inner buckle plate.

[0009] Preferably, the liquid crystal module includes a liquid crystal panel, which is composed of a liquid crystal molecule layer, a polarizer, a glass substrate and a filter. The liquid crystal molecules will change their arrangement under the action of an electric field, thereby controlling the transmission and blocking of light to achieve image display. A fixed frame is fixedly installed on the outer side of the liquid crystal module, and a rubber frame strip is fixedly installed on the outer side of the fixed frame. The rubber frame strip is filled between the fixed frame and the liquid crystal panel frame. After vibration occurs, the rubber deformation of the rubber frame strip cooperates with the rubber arc strip in the outer frame assembly to perform vibration buffering and provide a shockproof effect. The fixed frame is clamped with the liquid crystal panel frame through the rubber frame strip, and the corners of the outer side of the liquid crystal panel frame Screw holes are provided, and bolts are threadedly connected at the screw holes of the liquid crystal panel frame. The liquid crystal panel frame is fixedly connected to the backlight module by the bolts, and a positioning strip is fixedly installed on the side of the liquid crystal panel frame close to the backlight module. The positioning strip corresponds to the card strip of the card strip frame one by one, and the card strip frame and the card slot frame are clamped to avoid the card breakage caused by vibration due to the card material being a plastic product, and the inability to provide a fixed compression effect. At the same time, during installation, the card strip corresponds to the positioning strip one by one, and the card strip is preferentially clamped during installation to prevent the backlight module and the liquid crystal module from shifting during installation or vibration. The positioning strip is symmetrically installed along the center position of the axis of the liquid crystal panel frame.

[0010] Preferably, the backlight module comprises a card slot frame, a card slot is symmetrically provided on a side of the card slot frame close to the liquid crystal panel frame, and an LED light strip is fixedly installed at the bottom of the inner wall of the card slot frame, and a reflective film, a light guide plate, a light-enhancing film and a diffusion film are installed in sequence inside the card slot frame from the side away from the liquid crystal panel frame to the side close to the liquid crystal panel frame, and a card strip frame is clamped at the card slot of the card slot frame, and the reflective film, the light guide plate, the light-enhancing film and the diffusion film are tightly pressed together by clamping the card plate of the card strip frame with the card slot frame to prevent the existence of gaps therebetween, which may cause wrinkles during vibration and result in failure to conduct light normally. line, and at the same time, the card strip frame and the positioning strip are tightly fitted after installation to avoid the breakage of the card slot frame and the card strip frame at the clamping position during vibration, which affects the clamping effect. There are two card strip frames and they are symmetrically installed along the center position of the axis of the card slot frame. A card strip is arranged on the outer side of the card strip frame and corresponds to the card slot of the card slot frame one by one, and the side of the card strip close to the liquid crystal panel frame is lower than the side of the card strip frame close to the liquid crystal panel frame. The card strip frame clamps and fixes the reflective film, the light guide plate, the light enhancement film and the diffusion film through the clamping of the card strip and the card slot frame, and the card strip of the card strip frame corresponds to the positioning strip one by one.

[0011] The present invention provides a liquid crystal screen with a shockproof function, which has the following beneficial effects:

[0012] 1. The LCD screen with shockproof function, through the adaptation of the rubber arc strip and the arc surface of the slide groove plate, can buffer the impact force through deformation during vibration through the rubber deformation characteristics of the rubber arc strip when the vibration impacts. At the same time, the sliding installation between the sliding frame and the slide groove plate is cooperated to provide a buffering and shockproof effect while avoiding vibration deviation, resulting in a break at the connection position with the display housing after vibration, or misalignment between the LCD screen and the display housing.

[0013] Second, the LCD screen with shockproof function is filled between the fixed frame and the LCD panel frame by a rubber frame strip. When vibration occurs, the rubber deformation of the rubber frame strip cooperates with the rubber arc strip in the outer frame assembly to buffer the vibration and provide a shockproof effect.

[0014] 3. The LCD screen with shockproof function has a one-to-one correspondence between the positioning strip and the card strip frame, and the card strip frame and the card slot frame are clamped to avoid the card breakage caused by vibration due to the card material being a plastic product, and the inability to provide a fixed compression effect. At the same time, during installation, the card strip and the positioning strip correspond one-to-one, and are preferentially clamped during installation to prevent the backlight module and the LCD module from shifting during installation or vibration.

[0015] Fourth, the LCD screen with shockproof function can press the reflective film, light guide plate, light enhancement film and diffusion film tightly together by connecting the card plate of the card strip frame with the card slot frame to prevent gaps between them, which may cause wrinkles during vibration and make it impossible to conduct light normally. At the same time, the card strip frame and the positioning strip are tightly fitted after installation to avoid the card slot frame and the card strip frame from breaking at the connection position during vibration, which affects the pressing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the external structure of a liquid crystal screen with a shockproof function according to the present invention;

[0017] Figure 2 A side view of a liquid crystal screen structure with a shockproof function according to the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the outer frame assembly of the present invention;

[0019] Figure 4 This is a structural anatomical diagram of the outer frame assembly of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of the liquid crystal module of the present invention;

[0021] Figure 6 It is a side view of the liquid crystal module structure of the present invention;

[0022] Figure 7 This is a schematic diagram of the structure of the backlight module of the present invention;

[0023] Figure 8 This is a structural dissection diagram of the backlight module of the present invention.

[0024] In the figure: 1. LCD module; 2. Outer frame assembly; 3. Backlight module; 11. LCD panel frame; 12. LCD panel assembly; 13. Rubber frame strip; 14. Fixed frame; 15. Positioning strip; 16. Bolt; 21. External support frame; 22. Inner buckle plate; 23. Connecting slide frame; 24. Slide plate; 25. Slider; 26. Rubber arc strip; 31. Slot frame; 32. Strip frame; 33. Diffusion film; 34. Brightness enhancement film; 35. Light guide plate; 36. LED light strip; 37. Reflective film. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0026] The first embodiment, as Figures 1 to 4 As shown, the present invention provides a technical solution: a liquid crystal screen with a shockproof function, comprising:

[0027] A backlight module 3, which is used to provide light source for the image display of the liquid crystal screen;

[0028] Liquid crystal module 1, which is used to control the arrangement direction of liquid crystal molecules by rotating the light emitted by the backlight module 3 through liquid crystal under voltage, thereby realizing the control of light transmission and blocking to display different images, and the liquid crystal module 1 is fixedly installed with the backlight module 3;

[0029] An outer frame assembly 2, which is used to wrap the backlight module 3 and the liquid crystal module 1, and is connected and fixed to the display housing through the outer frame assembly 2;

[0030] The outer frame assembly 2 includes an outer support frame 21, and a slide plate 24 is fixedly installed on the upper and lower sides of the outer support frame 21. The two sides of the slide plate 24 are symmetrically provided with column grooves, and the side of the slide plate 24 away from the outer support frame 21 is an arc surface that is concave inward at the center position. Slide blocks 25 are slidably installed at the column grooves of the slide plate 24. The slide plate 24 is slidably installed to connect the slide frame 23 through the slider 25. A rubber arc strip 26 is fixedly installed on one side of the inner side of the slide frame 23 close to the arc surface of the slide plate 24. The hole plate connecting the slide frame 23 is fixedly connected to the shell of the display by screws, and is clamped and fixed to the liquid crystal module 1 and the backlight module 3 through the inner buckle plate 22 on the inner wall of the outer support frame 21. When the display is subjected to external force and vibrates during use, since the connection slide frame 23 is fixed to the shell of the display, the outer support frame 21 is fixed to the liquid crystal module 1 through the inner buckle plate 22, and the rubber arc strip 26 is fixedly installed to the outer support frame 21. The side close to the slide plate 24 is an arc surface protruding outward from the center position, and the arc surface of the rubber arc strip 26 is adapted to the arc surface of the slide plate 24. Both ends of the connecting slide frame 23 away from the outer support frame 21 are provided with perforated plates. The LCD screen is fixedly connected to the shell of the display through the perforated plates. The inner wall of the outer support frame 21 is fixedly installed with an inner buckle plate 22. After the vibration occurs, the impact force causes the connecting slide frame 23 and the slide plate 24 to slide relative to each other under the vibration force through the sliding installation of the slider 25. Under the force, the relative sliding trend is transmitted to the rubber arc strip 26. The deformation of the rubber arc strip 26 under the sliding trend buffers the vibration impact force. The inner buckle plate 22 is symmetrically installed along the center position of the axis of the outer support frame 21. The outer support frame 21 is clamped with the liquid crystal module 1 and the backlight module 3 through the inner buckle plate 22.

[0031] The second embodiment is based on the first embodiment. Figures 5 and 6As shown, the liquid crystal module 1 includes a liquid crystal panel 12, which is composed of a liquid crystal molecule layer, a polarizer, a glass substrate and a filter. The liquid crystal molecules will change their arrangement under the action of an electric field, thereby controlling the transmission and blocking of light to achieve image display. The light transmitted by the backlight module 3 passes through the liquid crystal panel 12, and the arrangement and angle of the liquid crystal molecules controlled by the liquid crystal panel 12 after power is turned on, so that the light is converted into an image for display and transmitted. At the same time, during the installation process, the liquid crystal panel frame 11 is fixedly connected to the card slot frame 31 by bolts 16. A fixed frame 14 is fixedly installed on the outside of the liquid crystal module 1, and a rubber frame strip 13 is fixedly installed on the outside of the fixed frame 14. The fixed frame 14 is clamped with the liquid crystal panel frame 11 through the rubber frame strip 13. The liquid crystal panel frame 1 1, screw holes are provided at the corners of the outer side of the liquid crystal panel frame 11, and bolts 16 are threadedly connected at the screw holes of the liquid crystal panel frame 11. The liquid crystal panel frame 11 is fixedly connected to the backlight module 3 through the bolts 16. After being fixed, the positioning pressure strips 15 correspond to the card strips of the card strip frame 32 one by one, and the card strip frame 32 and the card slot frame 31 are clamped to improve the pressing effect. At the same time, during installation, the backlight module 3 and the liquid crystal module are made to correspond through preferential clamping correspondence. At the same time, during the vibration process, the rubber frame strip 13 is used to fill between the fixed frame 14 and the liquid crystal panel frame, and the rubber deformation is used for buffering. A positioning pressure strip 15 is fixedly installed on one side of the liquid crystal panel frame 11 close to the backlight module 3, and the positioning pressure strip 15 is symmetrically installed along the center position of the axis of the liquid crystal panel frame 11.

[0032] The third embodiment is based on the first and second embodiments. Figures 7 and 8 As shown, the backlight module 3 includes a card slot frame 31, and the card slot frame 31 has a card slot symmetrically opened on one side close to the liquid crystal panel frame 11, and an LED light bar 36 is fixedly installed at the bottom of the inner wall of the card slot frame 31. When the backlight module 3 is powered on to transmit light to the liquid crystal module 1, the electric energy is converted into light energy through the LED light bar 36, and the light passes through the side of the light guide plate 35 and the cooperation of the reflective film 37. At the same time, the card slot frames 31 on all sides seal the surroundings, so that the light is transmitted to the liquid crystal module 1. At the same time, during the transmission process, the light passes through the brightness enhancement film 34 and the diffusion film 33 in sequence, so that the light is evenly transmitted to the liquid crystal module 1. The interior of the card slot frame 31 is sequentially installed with a reflective film 37, a light guide plate 35, a brightness enhancement film 34 and a diffusion film 33 from the side away from the liquid crystal panel frame 11 to the side close to the liquid crystal panel frame 11.

[0033] A card strip frame 32 is clamped at the card slot of the card slot frame 31. There are two card strip frames 32 and they are symmetrically installed along the center position of the axis of the card slot frame 31. A card strip is arranged on the outer side of the card strip frame 32 and corresponds to the card slot of the card slot frame 31 one by one, and the side of the card strip close to the liquid crystal panel frame 11 is lower than the side of the card strip frame 32 close to the liquid crystal panel frame 11. During operation, when vibration occurs, the card strip on the outer side of the card strip frame 32 is clamped with the card slot frame 31. Through the clamping of the card strip frame 32, the reflective film 37, the light guide plate 35, the light enhancement film 34 and the diffusion film 33 are pressed to prevent the reflective film 37, the light guide plate 35, the light enhancement film 34 and the diffusion film 33 from being misaligned during the vibration. The card strip frame 32 clamps and fixes the reflective film 37, the light guide plate 35, the light enhancement film 34 and the diffusion film 33 through the clamping of the card strip with the card slot frame 31, and the card strip of the card strip frame 32 corresponds to the positioning pressure strip 15 one by one.

[0034] When in use, the LCD screen is installed inside the display housing through the outer frame assembly 2. When working, the backlight module 3 and the LCD module 1 are energized, so that the backlight module 3 converts electrical energy into light energy and transmits it to the LCD module 1. The LCD module 1 controls the arrangement and angle of the internal liquid crystal molecules when energized, and converts the light emitted by the backlight module 3 into image display.

[0035] When the outer frame assembly 2 is fixedly connected to the shell of the display, the perforated plate of the connecting slide frame 23 is fixedly connected to the shell of the display by screws, and the inner buckle plate 22 on the inner wall of the outer support frame 21 is clamped and fixed to the liquid crystal module 1 and the backlight module 3. When the display is subjected to external force and vibrates during use, since the connecting slide frame 23 is fixed to the shell of the display, the outer support frame 21 is fixed to the liquid crystal module 1 through the inner buckle plate 22. After the vibration occurs, the impact force causes the connecting slide frame 23 and the slide plate 24 to slide relative to each other under the action of the vibration through the sliding installation of the slider 25. Under the action of the force, the relative sliding tendency is transmitted to the rubber arc strip 26, and the vibration impact force is buffered by the deformation of the rubber arc strip 26 under the sliding tendency.

[0036] When the backlight module 3 is powered on to transmit light to the liquid crystal module 1, the electrical energy is converted into light energy through the LED light strip 36, and the light passes through the side of the light guide plate 35 and the cooperation with the reflective film 37. At the same time, the surrounding card slot frames 31 seal the surroundings to transmit the light to the liquid crystal module 1. At the same time, during the transmission process, the light passes through the brightness enhancement film 34 and the diffusion film 33 in turn, so that the light is evenly transmitted to the liquid crystal module 1. At the same time, during the operation, when vibration occurs, the card strip on the outside of the card strip frame 32 is connected with the card slot frame 31, and the card strip frame 32 is connected to compress the reflective film 37, the light guide plate 35, the brightness enhancement film 34 and the diffusion film 33 to prevent the reflective film 37, the light guide plate 35, the brightness enhancement film 34 and the diffusion film 33 from being misaligned during the vibration.

[0037] In the liquid crystal module 1, the light transmitted by the backlight module 3 passes through the liquid crystal panel 12, and the arrangement and angle of liquid crystal molecules controlled by the liquid crystal panel 12 after power is turned on, so that the light is converted into an image for display and transmitted. At the same time, during the installation process, the liquid crystal panel frame 11 is fixedly connected to the card slot frame 31 by bolts 16. After fixation, the positioning pressure strip 15 corresponds to the card strip of the card strip frame 32 one by one, and the card strip frame 32 is connected with the card slot frame 31 to improve the clamping effect. At the same time, during installation, the backlight module 3 corresponds to the liquid crystal module through priority card connection. At the same time, during the vibration process, the rubber frame strip 13 is used to fill the space between the fixed frame 14 and the liquid crystal panel frame, and the rubber deformation is used for buffering.

[0038] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A liquid crystal display with shockproof function, characterized in that: include: A backlight module (3), the backlight module (3) being used to provide a light source for image display on a liquid crystal screen; A liquid crystal module (1), the liquid crystal module (1) being used to control the arrangement direction of liquid crystal molecules by rotating the light emitted by the backlight module (3) through liquid crystal under voltage, thereby achieving control over the transmission and blocking of light to display different images, and the liquid crystal module (1) is fixedly mounted to the backlight module (3); An outer frame component (2), the outer frame component (2) being used to wrap the backlight module (3) and the liquid crystal module (1), and being connected and fixed to a display housing via the outer frame component (2); The outer frame assembly (2) comprises an outer support frame (21), and a slide plate (24) is fixedly mounted on both upper and lower sides of the outer support frame (21), and column grooves are symmetrically provided on both sides of the slide plate (24), and a side of the slide plate (24) away from the outer support frame (21) is an arc surface that is concave inwardly at a central position, and sliders (25) are slidably mounted at the column grooves of the slide plate (24), and the slide plate (24) is slidably mounted to connect the slide frame (23) through the sliders (25), and a rubber arc strip (26) is fixedly mounted on one side of the connecting slide frame (23) close to the arc surface of the slide plate (24), and a side of the rubber arc strip (26) close to the slide plate (24) is an arc surface that is convex outwardly at a central position, and the arc surface of the rubber arc strip (26) is adapted to the arc surface of the slide plate (24).

2. The liquid crystal display with shockproof function according to claim 1, characterized in that: Both ends of the connecting sliding frame (23) away from the outer support frame (21) are provided with perforated plates, and the liquid crystal screen is fixedly connected to the housing of the display via the perforated plates. An inner buckle plate (22) is fixedly installed on the inner wall of the outer support frame (21), and the inner buckle plate (22) is symmetrically installed along the center position of the axis of the outer support frame (21). The outer support frame (21) is clamped with the liquid crystal module (1) and the backlight module (3) via the inner buckle plate (22).

3. The liquid crystal display with shockproof function according to claim 2, characterized in that: The liquid crystal module (1) comprises a liquid crystal panel (12), wherein the liquid crystal panel (12) is composed of a liquid crystal molecule layer, a polarizing film, a glass substrate and a filter. The liquid crystal molecules change their arrangement under the action of an electric field, thereby controlling the transmission and blocking of light and realizing image display.

4. The liquid crystal display with shockproof function according to claim 3, characterized in that: A fixing frame (14) is fixedly mounted on the outer side of the liquid crystal module (1), a rubber frame strip (13) is fixedly mounted on the outer side of the fixing frame (14), and the fixing frame (14) is clamped to the liquid crystal panel frame (11) via the rubber frame strip (13).

5. The liquid crystal display with shockproof function according to claim 4, characterized in that: Screw holes are provided at the corners of the outer side of the liquid crystal panel frame (11), and bolts (16) are threadedly connected at the screw holes of the liquid crystal panel frame (11).

6. The liquid crystal display with shockproof function according to claim 5, characterized in that: The liquid crystal panel frame (11) is fixedly connected to the backlight module (3) via bolts (16), and a positioning strip (15) is fixedly mounted on one side of the liquid crystal panel frame (11) close to the backlight module (3), wherein the positioning strip (15) is symmetrically mounted along the central position of the axis of the liquid crystal panel frame (11).

7. The liquid crystal display with shockproof function according to claim 6, characterized in that: The backlight module (3) comprises a slot frame (31), a slot is symmetrically provided on one side of the slot frame (31) close to the liquid crystal panel frame (11), and an LED light bar (36) is fixedly mounted on the bottom of the inner wall of the slot frame (31).

8. The liquid crystal display with shockproof function according to claim 7, characterized in that: A reflective film (37), a light guide plate (35), a brightness enhancement film (34) and a diffusion film (33) are installed in sequence inside the card slot frame (31) from a side away from the liquid crystal panel frame (11) to a side close to the liquid crystal panel frame (11).

9. The liquid crystal display with shockproof function according to claim 8, characterized in that: A card strip frame (32) is clamped at the card slot of the card slot frame (31); the card strip frames (32) are two in number and are symmetrically installed along the center position of the axis of the card slot frame (31); card strips are arranged on the outer side of the card strip frame (32) and correspond one to one with the card slots of the card slot frame (31); and a side of the card strip close to the liquid crystal panel frame (11) is lower than a side of the card strip frame (32) close to the liquid crystal panel frame (11).

10. The liquid crystal display with shockproof function according to claim 9, characterized in that: The card strip frame (32) clamps and fixes the reflective film (37), the light guide plate (35), the light enhancement film (34) and the diffusion film (33) by means of the card strip and the card slot frame (31), and the card strips of the card strip frame (32) correspond one to one with the positioning pressure strips (15).

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