CN111123567B - Curved surface coating process for display screen and display manufactured by applying process - Google Patents

Abstract

The invention relates to a surface coating process for a display screen and a display made by applying the process, and relates to the technical field of display screens. The invention includes the following steps: preparing a square PVC sheet, placing it on a dust-free workbench for positioning; Apply weak alkaline cleaning agent on the top surface to remove oil, moisture and other stains on the surface of the PVC board; pre-cool the top surface of the PVC board; apply the PVC raw material in a viscous flow state to the top surface of the PVC board with a thickness of no more than 1mm ;The edge of each application area is spaced apart from the edge of the previous application area; the edge of the PVC sheet is heated to soften it and reduce the edges and corners of the PVC layer; the edge of the PVC layer is ground and polished to form the edge of the multi-layer PVC layer Smooth convex surface. The present invention has the effect of eliminating the frame between the spliced display screens to improve the display effect of the device.

Description

A display screen surface coating process and a display made by applying the process

technical field

The present invention relates to the technical field of display screens, in particular to a surface coating process of a display screen and a display made by applying the process.

Background technique

At present, the liquid crystal display is a flat and ultra-thin display device. It consists of a certain number of color or black and white pixels, which are placed in front of the light source or the reflective surface. It is widely used in various electronic devices that use batteries due to its low power consumption. middle.

However, existing liquid crystal displays often inevitably have borders, which will affect the display of edge pixels to a certain extent. Especially in a splicing screen display device, the occlusion of the frame will make the overall image appear to have dark lines, which will affect the display effect of the overall display device.

The Chinese invention with the announcement number CN104035233B discloses a display frame eliminating device and a display device. The device includes a light source, a light pipe and a driving module, wherein: the light pipe includes an upper surface and a lower surface, and the light source is located in the In the light pipe or under the lower surface of the light pipe; the upper and lower surfaces of the light pipe are covered on the display screen frame and the non-display edge area of the display screen, and the light pipe is used to make all the The light emitted by the light source is scattered and emitted on the upper surface of the light pipe; the driving module is used for driving the light source to emit light according to the light emission condition of the edge pixels in the display screen. The invention uses the internal light source to emit light similar to the adjacent edge pixels in the display screen under the control of the driving module, and realizes the scattered emission of the light on the upper surface of the light pipe through the layered light pipe structure with upper and lower surfaces. It seems to the human eye that the display influence of the frame can be eliminated, and the display effect of the display device can be improved.

The above-mentioned prior art solutions have the following defects: the driving module needs to collect the luminous conditions of the pixels on the edge of the display screen to drive the corresponding changes of the light source, so there will be a delay between the light source and the display screen. When the color difference before and after the point is large, a dividing line will appear, resulting in a border phenomenon, which will affect the display effect of the device.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the first object of the present invention is to provide a display screen surface coating process and a display made by applying the process, which can eliminate the frame between the spliced display screens, thereby improving the display effect of the device.

The above-mentioned purpose of the present invention is achieved through the following technical solutions:

A display screen curved surface coating process and a display made by applying the process, comprising the following steps:

S100: Prepare a dust-free workbench, prepare a square PVC sheet, place the PVC sheet on the dust-free workbench and position the PVC sheet;

S200: Coat the top surface of the PVC sheet with a weak alkaline cleaning agent to remove oil, moisture and other stains on the surface of the PVC sheet, and remove the PVC sheet after cleaning;

S300: Pre-cooling the top surface of the PVC sheet;

S400: Apply the PVC raw material in a viscous flow state to the top surface of the PVC sheet, and then wait for the PVC layer to solidify. The thickness of the coating is kept uniform and the thickness is not more than 1mm, and the edge of the coating area and the edge of the PVC sheet are reserved.

S500: Repeat steps S300 and S400 multiple times, and reserve a space between the edge of each smeared area and the edge of the last smeared area;

S600: Heat the edge of the PVC sheet coated with the PVC layer to soften it and reduce the edges and corners of the PVC layer;

S700: Grind and polish the edge of the PVC sheet coated with the PVC layer, so that the edge of the multi-layer PVC layer forms a smooth convex arc surface, and the multi-layer PVC layer and the PVC sheet form the outer screen of the liquid crystal panel.

By adopting the above technical solutions, the PVC sheet can be used as the outer screen of the liquid crystal panel to protect the screen and prevent glare. Improve the display effect of the display; and the PVC sheet is used as a support to facilitate the coating of the PVC layer; the top surface of the PVC sheet is pre-cooled, so as to avoid the softening of the surface of the PVC sheet after the contact between the PVC material with high temperature and the PVC sheet. And make it deformed, so as to improve the processing accuracy and improve the stability of the PVC sheet; the coating of the PVC layer is used to make the edge of the outer screen of the liquid crystal panel curved, so that the display screen of the liquid crystal panel is refracted and scattered by the convex curved surface Then it becomes larger to cover the frame to achieve the effect of eliminating the frame, and the light transmission delay is low, so as to reduce the frame effect caused by the delay.

In a preferred example of the present invention, it may be further configured as follows: the step S300 further includes a step S310 : coating or spraying a coolant on the surface of the PVC sheet, and the coolant has strong volatility.

By adopting the above technical solution, the coolant has strong volatility. When the coolant is coated on the surface of the PVC sheet, it will volatilize and take away the heat on the surface of the PVC sheet, thereby achieving the effect of cooling and avoiding softening of the PVC sheet.

In a preferred example of the present invention, it can be further configured as follows: the step S300 further includes a step S320: placing the PVC sheet into a negative pressure box with an air pressure lower than the standard atmospheric pressure.

By adopting the above technical solution, the surface tension of the PVC stock solution applied on the PVC sheet is reduced through a negative pressure environment, and the generation of air bubbles is reduced, so as to improve the appearance of the outer screen of the liquid crystal panel, improve the light guide rate, and thus improve the display effect.

In a preferred example of the present invention, it can be further configured as follows: the step S500 further includes a step S510: the area of the PVC layer applied in the last layer should be equal to or smaller than the display area of the corresponding liquid crystal panel, and its diagonal The intersection is vertically opposite to the intersection of the diagonal lines of the border of the liquid crystal panel.

By adopting the above technical solution, the area of the PVC layer applied in the last layer should be equal to or smaller than the display area of the corresponding LCD panel, so as to avoid the occurrence of borders and affect the display effect; the intersection of the diagonal lines of the PVC layer applied in the last layer It is vertically opposite to the intersection of the diagonal lines of the frame of the LCD panel, so that the plane area of the PVC layer is centered and the distortion of the picture is reduced.

In a preferred example of the present invention, the step S500 may further include: step S520 : increasing the interval distance reserved between the edge of each application area and the edge of the previous application area from the PVC sheet upward.

By adopting the above technical solution, the interval distance reserved between the edge of each application area and the edge of the previous application area increases, so that the edge of the multi-layer PVC layer deviates to the arc shape, thereby reducing the workload of later grinding and polishing, and improving the processing. efficiency.

In a preferred example of the present invention, it can be further configured as: the step S600 further includes the following steps: S610: laying a protective plate on the plane area of the topmost PVC layer; S620: coating the edge of the multi-layer PVC layer from bottom to top Cover the PVC raw material in a viscous flow state and wait for curing; Step S630 : cut off the PVC wastes remaining on the edge and side walls of the PVC sheet.

By adopting the above technical solution, the main display area on the top surface of the PVC is protected by the protective plate, so as to avoid contamination of the PVC raw material or scratches and affect the light guide rate, thereby improving the display effect; The PVC raw material in viscous flow state is coated on the top to fill the stepped groove between each layer of PVC layers and make the edge area of the PVC layer smooth. The bottom-up coating method can make the PVC liquid flow into the stepped groove smoothly. Filling, reducing the influence of gravity, thereby reducing the generation of air bubbles; the PVC liquid will inevitably flow down and adhere to the edge of the PVC sheet during coating, and the edge of the PVC sheet is improved by cutting off the residual PVC waste on the sidewall of the edge of the PVC sheet. degree, so as to facilitate the seamless splicing of the display.

In a preferred example, the present invention may be further configured as: the step S700 further includes: step S710: polishing the edge sidewall of the PVC sheet; S720: laying or coating a layer of reflective layer on the edge sidewall of the PVC sheet, The reflective surface of the reflective layer faces the side wall of the PVC sheet.

By adopting the above technical solution, the side wall of the PVC sheet is polished before laying or coating a layer of reflective layer, and the reflective surface of the reflective layer faces the side wall of the PVC sheet, so as to reflect the scattered light generated by the backlight and improve the internal brightness of the LCD panel , to reduce the light transmitted from the edge of the PVC sheet, and avoid the occurrence of light spots on the supports such as walls that support the display, which will affect the use experience of the display.

The second object of the present invention is to provide a frameless display, which can eliminate the frame between the spliced display screens, thereby improving the display effect of the device.

The above object of the present invention is achieved through the following technical solutions: a frameless display, comprising a casing and an outer screen of a liquid crystal panel connected to the casing.

In a preferred example of the present invention, it can be further configured that: the outer screen of the liquid crystal panel is provided with a ring groove around it, and the casing is provided with a slot that is inserted and matched with the inner wall of the ring groove. When plugged in, the peripheral side wall of the casing is flush with the edge side wall of the outer screen of the liquid crystal panel.

By adopting the above technical solution, the installation and fixation of the outer screen of the liquid crystal panel is realized through the cooperation of the slot of the casing and the ring groove. The side walls are flush, which reduces the gaps of multiple frameless displays, thereby facilitating the splicing of multiple frameless displays, thereby improving the display effect.

In a preferred example of the present invention, it can be further configured that: the inner wall of the casing is provided with a plurality of bumps, the bumps are distributed around the shell at intervals, and one end of the bumps is sharp and faces On one side of the outer screen of the liquid crystal panel, when the outer screen of the liquid crystal panel is inserted into the housing, the bump is inserted into the outer screen of the liquid crystal panel, the side of the bump away from the outer screen of the liquid crystal panel is provided with a barb, and the protrusion is The outline of the block is in the shape of an obtuse triangle and the tips of the barbs are spaced apart from the inner wall of the casing. When the outer screen of the liquid crystal panel is inserted into the casing, the barbs abut against the outer screen of the liquid crystal panel.

By adopting the above technical solution, the outer screen of the liquid crystal panel is made of transparent PVC material. When the bump is inserted into the outer screen of the liquid crystal panel, the surface of the bump abuts against the outer screen of the liquid crystal panel, thereby increasing the contact area between the outer screen of the liquid crystal panel and the casing , to improve the connection strength of the two; and one end of the bump is sharp, so that the bump can be cut into the outer screen of the LCD panel; when the bump is inserted into the outer screen of the LCD panel, the barb on the bump is in contact with the outer screen of the LCD panel. The tips of the barbs are spaced apart from the inner wall of the casing, so as to prevent the outer screen of the liquid crystal panel from detaching from the casing, thereby improving the stability of the outer screen of the liquid crystal panel and prolonging the service life of the display.

To sum up, the present invention includes at least one of the following beneficial technical effects:

The PVC sheet is used as a support to facilitate the coating of the PVC layer; the top surface of the PVC sheet is pre-cooled to avoid softening the surface of the PVC sheet after contact with the PVC sheet with a higher temperature, thereby improving the performance of the PVC sheet. The processing accuracy improves the stability of the PVC sheet; the coating of the PVC layer is used to make the edge of the outer screen of the LCD panel arc, so that the display screen of the LCD panel becomes larger after being refracted and scattered by the convex arc surface, so as to cover Frame, to achieve the effect of eliminating the frame, and the light transmission delay is low, so as to reduce the frame effect caused by the delay;

When the coolant is coated on the surface of the PVC sheet, it will volatilize and take away the heat on the surface of the PVC sheet, so as to achieve the effect of cooling and avoid softening of the PVC sheet;

The reflective surface of the reflective layer reflects the scattered light generated by the backlight, improves the internal brightness of the LCD panel, reduces the light transmitted from the edge of the PVC sheet, and avoids light spots on the supports supporting the display such as walls and affects the use experience of the display.

Description of drawings

1 is a flowchart of an embodiment of the present invention;

Fig. 2 is the overall structure schematic diagram of the embodiment of the present invention;

FIG. 3 is a partial enlarged schematic view of part A in FIG. 2 .

Reference numerals: 1. Housing; 11. Bump; 12. Barb; 13. Slot; 2. Outer screen of liquid crystal panel; 21. Ring groove.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2, it is a display screen curved surface coating process disclosed by the present invention, which includes the following steps:

S100: Prepare a dust-free workbench. The dust-free workbench adopts a dust-free workbench of model K-1811, and then prepares a square PVC sheet. The width is the same, and then the PVC sheet is placed on a dust-free workbench and the PVC sheet is positioned with a simple clamp.

S200: Coat the top surface of the PVC sheet with a weak alkaline cleaning agent. The weak alkaline cleaning agent adopts the K26754 type glass cleaning agent, which can remove the oil, moisture and other stains on the surface of the PVC sheet, thereby reducing the light conductivity of the PVC sheet. to improve the display effect of the monitor. Remove the PVC sheet when cleaning is complete.

S300: Pre-cooling the top surface of the PVC sheet.

S310: During pre-cooling, a coolant should be applied or sprayed on the surface of the PVC sheet. The coolant is ethanol, which has strong volatility. When ethanol evaporates on the surface of the PVC sheet, it will take away the heat on the surface of the PVC sheet, so as to achieve cooling. The effect is to avoid softening of the PVC sheet.

S320: After pre-cooling, put the PVC sheet into a negative pressure box. The negative pressure box adopts a sealed glass experimental box, and the negative pressure box is pumped to a lower pressure than the standard atmospheric pressure by a vacuum pump, so as to reduce the density of dust and improve processing. quality. Gloves are attached to the experimental box to facilitate the operator to process the PVC board.

S400: Apply the viscous PVC raw material to the top surface of the PVC sheet evenly with a paint roller or other coating equipment to form a square PVC layer, then wait for the PVC layer to cure, and the coating thickness is kept uniform, and the thickness of a single layer of PVC layer does not exceed 1mm, so as to facilitate the elimination of air bubbles and reduce the phenomenon of air bubbles. The edge of the smeared area and the edge of the PVC sheet reserve a space.

S500 : Repeat steps S300 and S400 multiple times, that is, apply a layer of PVC and wait for curing before applying, and reserve an interval between the edge of each application area and the edge of the previous application area.

S510: And the area of the PVC layer applied on the last layer should be equal to or smaller than the area of the display area of the corresponding liquid crystal panel, so as to avoid the occurrence of a frame and affect the display effect. The intersection of the diagonal lines is vertically opposite to the intersection of the diagonal lines of the LCD panel frame, so that the plane area of the PVC layer is centered and directly opposite to the display screen of the LCD panel, reducing the distortion of the screen.

S520: When applying upwards from the PVC sheet, the reserved distance between the edge of each application area and the edge of the previous application area increases, so that the edge of the multi-layer PVC layer deviates to the arc profile, thereby reducing the workload of later grinding and polishing , improve processing efficiency.

S600: Heat the edge of the PVC sheet coated with the PVC layer to soften it, reduce the edges and corners of the PVC layer, and make the edge area of the PVC layer smooth.

S610: Lay a protective plate on the flat area of the topmost PVC layer. The protective plate is made of light and high-hardness materials such as aluminum plate to protect the main display area of the top surface of the PVC, so as to avoid the top surface of the PVC from contaminating the PVC material or scratching it out. Scratches will affect the light guide rate, thereby improving the final display effect.

S620: Coat the edge of the multi-layer PVC layer with PVC raw material in a viscous flow state from bottom to top and wait for curing to fill the stepped groove between the PVC layers, smooth the edge area of the PVC layer, and compensate the PVC raw material , convenient for grinding and polishing. And the bottom-up coating method can make the PVC liquid flow into the stepped groove gently for filling, reducing the influence of gravity, thereby reducing the generation of air bubbles.

S630: Cut off the PVC waste remaining on the side walls of the edge of the PVC sheet. Since the PVC liquid will inevitably flow down and adhere to the edge of the PVC sheet during coating, it is necessary to increase the step of cutting the PVC waste remaining on the side wall of the PVC sheet to improve the flatness of the edge of the PVC sheet. Seamless stitching of displays.

S700: Remove the protective plate, and then grind and polish the edge of the PVC sheet coated with the PVC layer, so that the edge of the multi-layer PVC layer forms a smooth convex arc surface, and the multi-layer PVC layer and the PVC sheet form the LCD panel outer screen 2.

S710: After that, polish the edge and side walls of the PVC sheet to keep the side walls vertical and smooth.

S720: Lay or coat a layer of reflective layer on the edge and sidewall of the PVC sheet. The reflective layer is made of aluminum foil, which is glued and fixed with the edge of the PVC sheet, and the reflective surface of the reflective layer faces the sidewall of the PVC sheet to reflect the backlight. The scattered light generated can improve the internal brightness of the liquid crystal panel, reduce the light transmitted from the edge of the PVC sheet, and avoid the occurrence of light spots on the supports such as walls that support the display, which will affect the use experience of the display.

Referring to FIG. 2 , it is a frameless display disclosed by the present invention, comprising a casing 1 and an outer screen 2 of a liquid crystal panel. A ring groove 21 is formed around the outer screen 2 of the liquid crystal panel, and the concave side of the ring groove 21 faces the side of the casing 1 . , the casing 1 is provided with a slot 13 that is inserted and matched with the inner wall of the ring groove 21, the slot 13 is square, and the cooperation between the slot 13 of the casing 1 and the ring groove 21 is used to realize the installation and operation of the outer screen 2 of the liquid crystal panel. fixed. When the outer screen 2 of the liquid crystal panel is inserted into the casing 1, the peripheral side wall of the casing 1 is flush with the side wall of the edge of the outer screen 2 of the liquid crystal panel, which reduces the gaps of multiple frameless displays, thereby facilitating the connection of multiple frameless displays. splicing, so as to improve the display effect.

Referring to FIGS. 2 and 3 , a plurality of bumps 11 are arranged on the inner wall of the housing 1, that is, the inner wall of the slot 13, and the plurality of bumps 11 are distributed around the housing 1 at intervals. It has a sharp shape and is integrally formed with the inner wall of the housing 1 , and its sharp end faces the side of the outer screen 2 of the liquid crystal panel. When the outer screen 2 of the liquid crystal panel is inserted into the housing 1, the edge of the outer screen 2 of the liquid crystal panel is heated to soften it, so that the sharp end of the bump 11 cuts the side wall of the outer screen 2 of the liquid crystal panel and is inserted into the outer screen of the liquid crystal panel. Inside the screen 2 , when the liquid crystal panel outer screen 2 is cured, the bumps 11 are embedded in the liquid crystal panel outer screen 2 . The arrangement of the plurality of bumps 11 can increase the contact area between the outer screen 2 of the liquid crystal panel and the housing 1, thereby improving the connection strength of the two, and one end of the bumps 11 is sharp, which is convenient for the bumps 11 to cut into the liquid crystal. Inside the screen 2 outside the panel.

The side of the bump 11 away from the LCD panel outer screen 2 is provided with a barb 12. The barb 12 and the bump 11 are integrally formed. Insert in the opposite direction. When the liquid crystal panel outer screen 2 is plugged into the casing 1, the barbs 12 abut against the liquid crystal panel outer screen 2, so as to improve the connection strength between the liquid crystal panel outer screen 2 and the casing 1, and prevent the liquid crystal panel outer screen 2 from detaching from the casing 1. In this way, the stability of the external screen 2 of the liquid crystal panel is improved, and the service life of the display is prolonged.

The implementation principle of this embodiment is as follows: the PVC sheet is used as a support to facilitate the coating of the PVC layer, and at the same time, the two materials are the same, so as to reduce chromatic aberration and thus reduce picture distortion. The top surface of the PVC sheet is pre-cooled, so as to avoid the contact of the higher temperature PVC raw material with the PVC sheet to soften the surface of the PVC sheet and deform it, thereby improving the processing accuracy and improving the stability of the PVC sheet. In addition, the negative pressure environment in the negative pressure box can reduce the surface tension of the PVC stock solution applied on the PVC sheet and reduce the generation of air bubbles, thereby improving the appearance of the LCD panel outer screen 2, improving the light guide rate, and thus improving the display effect.

The PVC sheet and the multi-layer PVC layers form the outer screen 2 of the liquid crystal panel, which can protect the screen and prevent glare. The coating of the PVC layer is used to make the edge of the outer screen 2 of the liquid crystal panel arc, so that the display screen of the liquid crystal panel becomes larger after being refracted and scattered by the convex arc surface, so as to cover the frame and realize the effect of eliminating the frame; and The optical transmission delay is low, thereby reducing the frame effect caused by the delay.

The embodiments of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention should be covered in within the protection scope of the present invention.

Claims (10)

1. a display screen curved surface coating technology, is characterized in that, comprises the following steps: S100: Prepare a dust-free workbench, prepare a square PVC sheet, place the PVC sheet on the dust-free workbench and position the PVC sheet; S200: Coat the top surface of the PVC sheet with a weak alkaline cleaning agent to remove oil, moisture and other stains on the surface of the PVC sheet, and remove the PVC sheet after cleaning; S300: Pre-cooling the top surface of the PVC sheet; S400: Apply the PVC raw material in a viscous flow state to the top surface of the PVC sheet, and then wait for the PVC layer to solidify. The thickness of the coating is kept uniform and the thickness is not more than 1mm, and the edge of the coating area and the edge of the PVC sheet are reserved. S500: Repeat steps S300 and S400 multiple times, and reserve a space between the edge of each smeared area and the edge of the last smeared area; S600: Heat the edge of the PVC sheet coated with the PVC layer to soften it and reduce the edges and corners of the PVC layer; S700: Grinding and polishing the edge of the PVC sheet coated with the PVC layer, so that the edge of the multi-layer PVC layer forms a smooth convex arc surface, and the multi-layer PVC layer and the PVC sheet form the outer screen of the liquid crystal panel (2). 2 . The curved surface coating process of a display screen according to claim 1 , wherein the step S300 further comprises a step S310 : coating or spraying a coolant on the surface of the PVC sheet, and the coolant has strong volatility. 3 . 3 . The process for coating a curved surface of a display screen according to claim 2 , wherein the step S300 further comprises a step S320 : placing the PVC sheet into a negative pressure box with an air pressure lower than standard atmospheric pressure. 4 . 4. The curved surface coating process of a display screen according to claim 1, wherein the step S500 further comprises a step S510: the area of the PVC layer applied in the last layer should be equal to or smaller than the display area of the corresponding liquid crystal panel area, and the intersection of its diagonal lines is vertically opposite to the intersection of the diagonal lines of the border of the LCD panel. 5 . The curved surface coating process of a display screen according to claim 4 , wherein the step S500 further comprises: step S520 : the interval reserved between the edge of each application area and the edge of the previous application area from the PVC sheet upwards. 6 . distance increases. 6 . The curved surface coating process for a display screen according to claim 1 , wherein the step S600 further comprises the following steps: S610 : laying a protective plate on the flat area of the topmost PVC layer; S620 : laying a protective plate on the multi-layer PVC layer. 7 . The edge of the layer is coated with PVC raw material in a viscous flow state from bottom to top and waits for curing; step S630 : cut off the PVC waste remaining on the side wall of the edge of the PVC board. 7 . The curved surface coating process of a display screen according to claim 1 , wherein the step S700 further comprises: step S710 : polishing the edge sidewall of the PVC sheet; S720 : laying on the edge sidewall of the PVC sheet Or coat a layer of reflective layer, the reflective surface of the reflective layer faces the side wall of the PVC sheet. 8. A borderless display, using the curved surface coating process for a display screen according to any one of claims 1-7, characterized in that it comprises a casing (1) and an outer screen of a liquid crystal panel connected to the casing (1). (2). 9 . The borderless display according to claim 8 , wherein a ring groove ( 21 ) is formed around the outer screen ( 2 ) of the liquid crystal panel, and a ring groove ( 21 ) is formed on the casing ( 1 ). 21) The inner wall is inserted into the slot (13), when the outer screen (2) of the liquid crystal panel is inserted into the casing (1), the peripheral side wall of the casing (1) and the edge side wall of the outer screen (2) of the liquid crystal panel flush. 10. The borderless display according to claim 9, characterized in that a plurality of bumps (11) are provided on the inner wall of the casing (1), and the plurality of bumps (11) surround the casing The body (1) is spaced apart, and one end of the bump (11) is sharp and faces the side of the liquid crystal panel outer screen (2), when the liquid crystal panel outer screen (2) is plugged into the housing (1) When the bump (11) is inserted into the outer screen (2) of the liquid crystal panel, a barb (12) is provided on the side of the bump (11) away from the outer screen (2) of the liquid crystal panel, and the protrusion (11) is provided with a barb (12). The outline is in the shape of an obtuse triangle and the tips of the barbs (12) are spaced apart from the inner wall of the housing (1). The outer screen (2) abuts.

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