Display screen

Abstract

The utility model discloses a display screen. The display screen comprises a printed circuit board, a light-emitting element and a packaging adhesive layer, the printed circuit board comprises a bottom plate and a top plate adhered to the bottom plate; the printed circuit board is provided with a plurality of accommodating holes and a plurality of pull-off holes; the accommodating hole penetrates through the top plate and exposes out of the bottom plate; the pull-off hole penetrates through at least part of the bottom plate in the direction from the bottom plate to the top plate, and the pull-off hole and the containing hole are not overlapped; the pull-off hole comprises a first branch and a second branch which are communicated with each other, the second branch is located on the side, close to the top plate, of the first branch, and the hole diameter of the first branch is larger than that of the second branch in the direction parallel to the plane where the bottom plate is located. The light-emitting element is positioned in the accommodating hole and is bonded on the bottom plate; the packaging adhesive layer is located in the accommodating hole and covers the light-emitting element. According to the technical scheme, the quality of the display screen can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to a display screen. Background Art

[0002] Printed circuit boards are widely used in display products. For example, by forming a driver circuit on a printed circuit board and bonding light-emitting components to the printed circuit board, a light board can be formed to achieve display functions.

[0003] In related technologies, multiple light panels are fixed to a large backplane to form a larger display. Currently, these fixing methods typically use screws or welding. Screw fixing affects the aesthetics, while welding carries the risk of falling off, so these fixing methods need to be optimized. Furthermore, the display's dust and water resistance needs improvement. Utility Model Content

[0004] The utility model provides a display screen to solve the above problems and improve the quality of the display screen.

[0005] The display screen provided by the utility model comprises: a printed circuit board, a light-emitting element and a packaging adhesive layer;

[0006] The printed circuit board includes a base plate and a top plate adhered to the base plate; the printed circuit board is provided with a plurality of receiving holes and a plurality of pull-out holes; the receiving holes penetrate the top plate and are exposed from the base plate; the pull-out holes penetrate at least a portion of the base plate in a direction from the base plate to the top plate, and the pull-out holes do not overlap with the receiving holes; the pull-out holes include a first subsection and a second subsection that are interconnected, the second subsection being located on a side of the first subsection close to the top plate, and the aperture of the first subsection is larger than the aperture of the second subsection in a direction parallel to the plane of the base plate;

[0007] The light emitting element is located in the receiving hole and is bonded to the base plate;

[0008] The packaging glue layer is located in the receiving hole and covers the light emitting element.

[0009] Optionally, the printed circuit board further includes an adhesive layer located between the bottom plate and the top plate; the bottom plate and the top plate are adhered to each other via the adhesive layer;

[0010] The receiving hole penetrates the adhesive layer.

[0011] Optionally, along the direction from the bottom plate to the top plate, the pull-out hole penetrates the bottom plate and the adhesive layer to expose the top plate.

[0012] Optionally, the printed circuit board further includes a solder resist layer; the solder resist layer wraps the top plate and the bottom plate; and the receiving hole and the pull-out hole both penetrate the solder resist layer.

[0013] Optionally, the first section at least penetrates the solder resist layer, and the second section penetrates at least a portion of the bottom plate.

[0014] Optionally, the inner wall of the pull-off hole is provided with a metal plating layer.

[0015] Optionally, the printed circuit board is further provided with a plurality of first through holes, the first through holes passing through the top plate, and the first through holes are filled with resin.

[0016] Optionally, along the direction from the bottom plate to the top plate, part of the first through holes and the pull-off holes are arranged to overlap.

[0017] Optionally, the printed circuit board further includes a plurality of through holes; the through holes penetrate the printed circuit board in a direction from the bottom plate to the top plate.

[0018] The display screen provided by the embodiment of the present invention provides a receiving hole in the printed circuit board that passes through the top plate and exposes the bottom plate, so that the light-emitting element is located in the receiving hole and bonded to the bottom plate, and the receiving hole is filled with a packaging adhesive layer to cover the light-emitting element, which is conducive to achieving a better waterproof and dustproof effect and improving the quality of the display screen; in addition, by providing a stepped pull-out hole in the printed circuit board, and making the pull-out hole pass through at least a portion of the bottom plate in the direction from the bottom plate to the top plate, and not overlapping with the receiving hole, the pull-out strength can be improved, the risk of the printed circuit board falling off from the back plate can be reduced, and the product quality can be improved while ensuring the aesthetics of the product.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of a top view of a display screen provided by an embodiment of the present utility model;

[0022] Figure 2 It is along Figure 1 A schematic diagram of the cross-sectional structure of the display screen taken along the middle section line AB;

[0023] Figure 3 This is a structural diagram of an existing printed circuit board used for a display screen;

[0024] Figure 4 It is along Figure 1A schematic cross-sectional view of another display screen taken along section line AB;

[0025] Figure 5 This is a schematic diagram of a top view of another display screen provided by an embodiment of the present utility model;

[0026] Figure 6 It is along Figure 5 A schematic cross-sectional view of the display screen taken along section line CD;

[0027] Figure 7 It is along Figure 5 A schematic cross-sectional view of another display screen taken along section line CD;

[0028] Figure 8 This is a physical diagram of a printed circuit board applied to a display screen provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0029] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0030] It will be apparent to those skilled in the art that various modifications and variations can be made in this application without departing from the spirit or scope of this application. Therefore, this application is intended to cover modifications and variations of this application that fall within the scope of the corresponding claims (technical solutions claimed for protection) and their equivalents. It should be noted that the embodiments provided in the examples of this application can be combined with each other without contradiction.

[0031] First, it should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by a person of ordinary skill in the field to which this utility model belongs. The terms "first", "second", and similar terms used in this utility model do not indicate any order, quantity, or importance, but are only used to distinguish different components. "Include" and similar terms mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. "Connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", and "right" and similar terms are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In addition, the shapes and sizes of the components in the drawings do not reflect the actual proportions and are only intended to illustrate the contents of the utility model.

[0032] Figure 1 This is a schematic diagram of a top view of a display screen provided by an embodiment of the present utility model. Figure 2 It is along Figure 1 The cross-sectional structure diagram of the display screen taken along the section line AB is as follows: Figure 1 and Figure 2 As shown, the display screen 100 provided by the present invention includes a printed circuit board 10, a light-emitting element 20 and a packaging adhesive layer 30; the printed circuit board 10 includes a bottom plate 11 and a top plate 12 adhered to the bottom plate 11; the printed circuit board 10 is provided with a plurality of receiving holes 101 and a plurality of pull-out holes 102; the receiving holes 101 pass through the top plate 12 and are exposed from the bottom plate 11; the pull-out holes 102 pass through at least a portion of the bottom plate 11 along the direction from the bottom plate 11 to the top plate 12, and the pull-out holes 102 are aligned with the bottom plate 11. The accommodating holes 101 do not overlap; the pull-off hole 102 includes a first section 1021 and a second section 1022 that are interconnected, and the second section 1022 is located on the side of the first section 1021 close to the top plate 12. Along the direction parallel to the plane of the bottom plate 11, the aperture of the first section 1021 is larger than the aperture of the second section 1022; the light-emitting element 20 is located in the accommodating hole 101 and bonded to the bottom plate 11; the encapsulation glue layer 30 is located in the accommodating hole 101, covering the light-emitting element 20.

[0033] The top and bottom of the top plate and bottom plate are defined according to the light-emitting surface. The top plate is closer to the light-emitting surface, and the bottom plate is farther away from the light-emitting surface. Figure 2The light-emitting element 20 emits light upward. The bottom plate 11 is located below the light-emitting element 20, facing away from the light-emitting surface, while the top plate 12 is located closer to the light-emitting surface. The bottom plate 11 is provided with a driving circuit that drives the light-emitting element 20. By providing a receiving hole 101 in the printed circuit board to expose the bottom plate 11, the light-emitting element 20 is bonded to the bottom plate 11, thereby driving the light-emitting element to emit light. The top plate 12 provides space for the light-emitting element 20 and increases the rigidity of the printed circuit board, preventing warping and improving the quality of the display.

[0034] like Figure 2 As shown, optionally, the printed circuit board 10 further includes an adhesive layer 13 located between the bottom plate 11 and the top plate 12 , the bottom plate 11 and the top plate 12 are adhered to each other through the adhesive layer 13 , and the receiving hole 101 passes through the adhesive layer 13 to expose the bottom plate 11 .

[0035] In addition, if Figure 2 As shown, the printed circuit board 10 further includes a solder resist layer 14 , which wraps the top plate 12 and the bottom plate 11 to improve the quality of the printed circuit board.

[0036] Furthermore, if Figure 2 As shown, in this embodiment, the receiving hole 101 is filled with a packaging adhesive layer 30, and the packaging adhesive layer 30 covers the light-emitting element 20, so that a better waterproof and dustproof effect can be achieved, and the quality of the display screen can be improved.

[0037] Furthermore, the display screen may include one or more printed circuit boards. As mentioned above, multiple printed circuit boards may be welded to a large-sized backplane to realize a large-sized display screen. Figure 2 As shown, in this embodiment, the back (bottom) of the printed circuit board 10 is further provided with a pull-out hole 102, which is used to accommodate solder so that the printed circuit board can be soldered to a large-sized backplane by soldering to realize a large-sized display screen. It should be noted that, in order to facilitate the display of the structural design of the pull-out hole, Figure 2 The backplane and solder are not shown. The pull-out hole design provided in this embodiment can improve pull-out strength, reduce the risk of the printed circuit board falling off the backplane, and ensure the aesthetics of the product. The working principle is explained below.

[0038] For example, Figure 3 This is a schematic diagram of the structure of a printed circuit board currently used for display screens, such as Figure 3As shown, conventional PCB 01 has only openings 012 in the green oil layer (solder mask) 011 to accommodate solder and enable soldering between the PCB and the backplane. In this design, openings 012 are flat, and solder enters through openings 012 to form flat pads. The pull-off strength is only the bonding force between the pad and the backplane. Insufficient pull-off strength can easily cause the PCB to fall off the backplane, affecting product quality.

[0039] Reference Figure 2 ,contrast Figure 3 In this embodiment, the pull-off hole 102 designed on the printed circuit board not only penetrates the solder resist layer 14, but also penetrates at least a portion of the bottom plate 11. Moreover, the aperture of the lower first section 1021 of the pull-off hole 102 is larger than the aperture of the upper second section 1022, thereby forming a stepped pull-off hole. With this design, the pull-off strength includes not only the bonding force between the pad and the back plate, but also the bonding force of the pad being pressed by the bottom plate, thereby improving the pull-off strength and reducing the risk of the printed circuit board falling off the back plate.

[0040] like Figure 2 As shown, optionally, along the direction from the bottom plate 11 to the top plate 12, the pull-out hole 102 does not overlap with the receiving hole 101. Specifically, the pull-out hole 102 is set at the bottom of the printed circuit board and is located in an area outside the positive projection range of the receiving hole 101. Such a setting is conducive to ensuring the rigidity of the printed circuit board and the quality of the display screen. For example, refer to Figure 1 and Figure 2 , a plurality of pull-out holes 102 ( Figure 2 Only one pull-off hole is shown).

[0041] In addition, it should be noted that Figure 2 The example in which the pull-out hole 102 does not completely penetrate the bottom plate 11 , that is, the pull-out hole 102 penetrates a portion of the bottom plate 11 , is used for illustration only. This configuration is not limiting. In other embodiments, the pull-out hole may completely penetrate the bottom plate.

[0042] In summary, the display screen provided by the embodiment of the present invention provides a receiving hole in the printed circuit board that passes through the top plate and exposes the bottom plate, so that the light-emitting element is located in the receiving hole and bonded to the bottom plate, and a packaging adhesive layer is filled in the receiving hole to cover the light-emitting element, which is conducive to achieving better waterproof and dustproof effects and improving the quality of the display screen; in addition, by providing a stepped pull-off hole in the printed circuit board, and making the pull-off hole pass through at least a portion of the bottom plate in the direction from the bottom plate to the top plate, and not overlapping with the receiving hole, the pull-off strength can be improved, the risk of the printed circuit board falling off from the back plate can be reduced, and the product quality can be improved while ensuring the aesthetics of the product.

[0043] Based on the above embodiments, Figure 2 Optionally, the first sub-portion 1021 at least penetrates the solder resist layer 14, and the second sub-portion 1022 penetrates at least a portion of the bottom plate 11. Specifically, the first sub-portion 1021 may only penetrate the solder resist layer 14, or may penetrate a portion of the bottom plate 11 while penetrating the solder resist layer 14. Further, when the first sub-portion 1021 only penetrates the solder resist layer 14, the second sub-portion 1022 may penetrate a portion of the bottom plate 11, or may penetrate the entire bottom plate 11. When the first sub-portion 1021 penetrates not only the solder resist layer 14 but also a portion of the bottom plate 11, the second sub-portion 1022 may penetrate a portion of the bottom plate 11.

[0044] For example, Figure 2 An example is given in which the first section 1021 penetrates the solder resist layer 14 and the second section 1022 penetrates a portion of the bottom plate 11 . Figure 4 It is along Figure 1 A schematic diagram of the cross-sectional structure of another display screen taken along the middle section line AB is shown in FIG. Figure 4 As shown, in this embodiment, the first section 1021 not only penetrates the solder resist layer 14 but also penetrates a portion of the bottom plate 11 , the second section 1022 penetrates another portion of the bottom plate 11 , and the entire pull-out hole 102 completely penetrates the bottom plate 11 .

[0045] Figure 5 This is a schematic diagram of a top view of another display screen provided by an embodiment of the present utility model. Figure 6 It is along Figure 5 The cross-sectional structure diagram of the display screen taken along the middle section line CD is as follows: Figure 5 and Figure 6 As shown, the printed circuit board 10 optionally further includes a plurality of through holes 103, which extend through the printed circuit board 10 in a direction from the bottom plate 11 to the top plate 12. With this arrangement, the environment can be observed through the display screen through the through holes 103, thereby realizing a transparent display screen design.

[0046] like Figure 6 As shown, optionally, a pull-out hole 102 is formed along the direction from the bottom plate 11 to the top plate 12, penetrating the bottom plate 11 and the adhesive layer 13 to expose the top plate 12. This arrangement can increase the bonding force between the pads and the adhesive layer and the pulling force between the top plate and the pads, further improving the pull-out strength and reducing the risk of the printed circuit board falling off. It can also prevent the top plate from being pulled off the bottom plate, thereby improving product quality.

[0047] For example, Figure 6As shown, the bottom plate 11 can be composed of a substrate (rigid) and a copper layer (copper), and the copper layer is used to form the driving circuit; the top plate 12 can also be composed of a substrate (rigid) and a copper layer (copper), and the copper layer provided in the top plate can prevent warping. Exemplarily, the material of the substrate can be FR4.

[0048] like Figure 6 As shown, the inner wall of the pull-out hole 102 is optionally provided with a metal coating 110. Solder and metal have a high bond strength. By providing a metal coating on the inner wall of the pull-out hole, the pull-out strength can be further improved, reducing the risk of the printed circuit board falling off. For example, the metal coating can be copper coating to reduce the difficulty of preparation and improve preparation efficiency.

[0049] like Figure 6 As shown, the printed circuit board 10 is optionally provided with a plurality of first through holes 104, which penetrate the top plate 12 and are filled with resin. This arrangement can further increase the pull-off force between the top plate 12 and the adhesive layer 13, thereby improving product quality.

[0050] Figure 7 It is along Figure 5 A schematic diagram of the cross-sectional structure of another display screen taken along the middle section line CD is shown in FIG. Figure 7 As shown, in some embodiments, optionally, along the direction from the bottom plate 11 to the top plate 12 , part of the first through holes 104 and the pull-off holes 102 are overlapped to further increase the pull-off strength and improve product quality.

[0051] For example, Figure 7 Three first through holes 104 are shown, wherein the two first through holes ( 104 - 1 and 104 - 3 ) on the left and right sides do not overlap with the pull-out hole 102 , and the middle first through hole ( 104 - 2 ) overlaps with the pull-out hole 102 .

[0052] For example, Figure 8 This is a physical diagram of a printed circuit board applied to a display screen provided by an embodiment of the present utility model, showing the top view structure of the bottom surface of the printed circuit board, combined with Figure 7 and Figure 8 , Figure 8 The small hole seen in the middle pull-out hole 102 area is the first through hole 104, which specifically corresponds to Figure 7 The first through hole (such as 104-2) overlapping with the pull-off hole 102, Figure 7 The first through holes (such as 104 - 1 and 104 - 2 ) blocked by the bottom plate 11 or the solder resist layer 14 cannot be seen by human eyes in the real object.

[0053] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A display screen, characterized in that: include: Printed circuit boards, light-emitting components, and encapsulation layers; The printed circuit board includes a bottom plate and a top plate adhered to the bottom plate; the printed circuit board is provided with a plurality of receiving holes and a plurality of pull-out holes; the receiving holes penetrate the top plate and are exposed from the bottom plate; the pull-out holes penetrate at least a portion of the bottom plate along the direction from the bottom plate to the top plate, and the pull-out holes do not overlap with the receiving holes; the pull-out holes include a first subsection and a second subsection that are interconnected, the second subsection being located on a side of the first subsection close to the top plate, and the aperture of the first subsection is larger than the aperture of the second subsection along a direction parallel to the plane of the bottom plate; The light emitting element is located in the receiving hole and bonded to the base plate; The packaging glue layer is located in the receiving hole and covers the light emitting element.

2. The display screen according to claim 1, wherein: The printed circuit board further includes an adhesive layer located between the bottom plate and the top plate; the bottom plate and the top plate are adhered to each other via the adhesive layer; The receiving hole passes through the adhesive layer.

3. The display screen according to claim 2, wherein: Along the direction from the bottom plate to the top plate, the pull-out hole penetrates the bottom plate and the adhesive layer to expose the top plate.

4. The display screen according to claim 1, wherein: The printed circuit board further includes a solder resist layer; the solder resist layer wraps the top plate and the bottom plate; the accommodating hole and the pull-off hole both penetrate the solder resist layer.

5. The display screen according to claim 4, characterized in that The first section at least penetrates the solder resist layer, and the second section penetrates at least a portion of the bottom plate.

6. The display screen according to claim 1, wherein: The inner wall of the pull-off hole is provided with a metal plating layer.

7. The display screen according to claim 1, wherein: The printed circuit board is further provided with a plurality of first through holes, which pass through the top plate and are filled with resin.

8. The display screen according to claim 7, characterized in that Along the direction from the bottom plate to the top plate, part of the first through holes and the pull-out holes are overlapped.

9. The display screen according to claim 1, wherein: The printed circuit board further includes a plurality of through holes; the through holes penetrate the printed circuit board in a direction from the bottom plate to the top plate.

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