CN112164335A

CN112164335A - Novel packaging structure of LED display screen

Info

Publication number: CN112164335A
Application number: CN202011172205.XA
Authority: CN
Inventors: 杨大海
Original assignee: Shenzhen Zhenping Technology Development Co ltd
Current assignee: Shenzhen Zhenping Technology Development Co ltd
Priority date: 2020-08-03
Filing date: 2020-10-28
Publication date: 2021-01-01

Abstract

A novel packaging structure of an LED display screen comprises a PCB and a plurality of LED lamp beads arranged on the PCB in an array arrangement mode, wherein first packaging fillers are arranged among the LED lamp beads and are combined with the LED lamp beads and the PCB; the first packaging filler is provided with a second packaging filler, the second packaging filler is combined with the first packaging filler and is separated from the LED lamp beads and the PCB to form an integral structure, and the second packaging filler is distributed among the LED lamp beads to respectively surround the LED lamp beads in the range of the second packaging filler. According to the LED lamp, the light-blocking second packaging filler is arranged between the LED lamp beads, and the LED lamp beads are respectively surrounded in the second packaging filler by the second packaging filler, so that the LED lamp beads at the edge position of the partition are outwards luminous to avoid the phenomenon of generating luminous lines, and the two adjacent LED lamp beads are partitioned to emit light towards each other to avoid the interference phenomenon. The novel packaging structure of the LED display screen has the characteristics of simple processing and uniform display.

Description

Novel packaging structure of LED display screen

[ technical field ] A method for producing a semiconductor device

The invention relates to a novel packaging structure of an LED display screen.

[ background of the invention ]

The packaging structure of the novel LED display screen generally comprises a PCB and LED lamp beads arranged on the PCB in an array manner. LED lamp pearl encapsulates on the PCB board after, seals with epoxy glue usually, wraps up LED lamp pearl inside in order to play the purpose of protection LED lamp pearl at epoxy glue. In the prior art, the packaging structure of the novel LED display screen is an integrated structure formed by bonding a PCB (printed circuit board), LED lamp beads and resin. When the LED lamp bead of the packaging structure of the novel LED display screen is lightened, the edge position of the LED lamp bead can emit light. When the packaging structures of a plurality of novel LED display screens are spliced together, a bright white luminous line can appear at the splicing position, and the display effect can be greatly influenced by the phenomenon.

[ summary of the invention ]

The invention aims to solve the problems and provides a novel packaging structure of an LED display screen, wherein the edge of the novel packaging structure does not emit light, and a light-emitting line cannot be generated at the splicing position during splicing.

In order to solve the problems, the invention provides a novel packaging structure of an LED display screen, which comprises a PCB and a plurality of LED lamp beads arranged on the PCB in an array arrangement mode, and is characterized in that first packaging fillers are arranged among the LED lamp beads, and the first packaging fillers are combined with the LED lamp beads and the PCB; and the second packaging filler is distributed among the LED lamp beads and respectively surrounds the LED lamp beads in the range of the second packaging filler.

Further, the second packing filler comprises a plurality of parallel and spaced transverse packing parts and a plurality of parallel and spaced longitudinal packing parts, and the transverse packing parts and the longitudinal packing parts are perpendicular and combined together.

Furthermore, the LED lamp beads are respectively distributed in a rectangular space formed by the enclosing of the transverse packaging part and the longitudinal packaging part.

Further, the first encapsulating filler is used for transmitting light, and the second encapsulating filler is used for blocking light.

Further, the first encapsulating filler is formed by curing a transparent resin UV glue; the second packaging filler is formed by curing black UV glue or black ink.

Furthermore, the intersection point of the light rays corresponding to the maximum light-emitting angle of two adjacent LED lamp beads is positioned in the second packaging filler.

Further, the distance between the bottom of the second packaging filler and the PCB is smaller than the distance between the top of the packaging body of the LED lamp bead and the PCB.

Further, a light diffusion material is arranged in the first packaging filler.

Further, the top of the second encapsulating filler is flush with the top of the first encapsulating filler.

Further, an anti-glare layer is arranged on the top of the first packaging filler and the second packaging filler.

The present invention advantageously contributes to effectively solving the above-mentioned problems. According to the LED lamp bulb, the light-blocking second packaging filler is arranged between the LED lamp bulbs, and the LED lamp bulbs are respectively surrounded inside the second packaging filler by the second packaging filler, so that the LED lamp bulbs at the edge positions of the partition are outwards luminous, and the two adjacent LED lamp bulbs are partitioned to emit light towards each other to generate an interference phenomenon. The packaging structure of the novel LED display screen can prevent light rays emitted by the lamp beads at the edge position from forming a bright white line at the edge of the display screen, can prevent light emitting lines from being generated during splicing, and can prevent light rays emitted by two adjacent LED lamp beads from forming a bright white line on the display screen, so that the integral display uniformity and contrast of the display screen can be improved. In addition, the packaging structure of the novel LED display screen can enlarge the light emitting surface of the LED lamp bead, realize the conversion from a point light source to a surface light source and solve the problem of moire of the LED display screen. The novel packaging structure of the LED display screen has the characteristics of simple processing, practical function and uniform display, has strong practicability and is suitable for being widely popularized.

[ description of the drawings ]

FIG. 1 is a schematic structural diagram of a PCB and LED lamp beads.

Fig. 2 is a schematic view of the overall structure of the present invention.

Fig. 3 is a cross-sectional view of fig. 2.

Fig. 4 is another cross-sectional view of the present invention.

Fig. 5 is a schematic view of the structure of the mold.

The attached drawings are as follows: the LED packaging structure comprises a PCB (printed circuit board) 10, LED lamp beads 20, a first packaging filler 30, a second packaging filler 40, a transverse packaging part 41, a longitudinal packaging part 42, an anti-glare layer 50, a mold 60, a peripheral frame 61 and a top mold part 62.

[ detailed description ] embodiments

The following examples are further illustrative and supplementary to the present invention and do not limit the present invention in any way.

As shown in fig. 1 to 4, the novel packaging structure of the LED display screen of the present invention includes a PCB board 10, LED beads 20, a first packaging filler 30 and a second packaging filler 40. The main key point of the invention is that the second packaging filler 40 is arranged between the LED lamp beads 20, the second packaging filler 40 can block light, and the second packaging filler can prevent light rays emitted by two adjacent LED lamp beads 20 from forming a bright white line on the display screen and prevent light rays emitted by lamp beads at the edge position from forming a bright white line at the edge of the display screen, so that the phenomenon of bright white lines at the splicing position when a plurality of novel LED display screen packaging structures are assembled can be avoided, and the integral display uniformity and contrast of the display screen can be improved.

As shown in fig. 1, the LED beads 20 are distributed in an array on the PCB 10, wherein the PCB 10 may be a known PCB 10, and the structure type is not limited; the LED lamp beads 20 can be known LED lamp beads 20, and the structural types are not limited. The LED lamp beads 20 may be attached to the PCB 10 by a known packaging process, such as SIP packaging, COB packaging, and the like.

As shown in fig. 1, the number of the LED lamp beads 20 is not limited, and the distance between the LED lamp beads 20 is not limited, which can be set as required; under the general condition, the packaging structure of novel LED display screen is the rectangle, consequently, LED lamp pearl 20 is in be rectangular array and arrange on the PCB board 10.

As shown in fig. 2, 3 and 4, in order to protect the lamp beads and achieve the waterproof and scratch-proof effects, a first packaging filler 30 is disposed between the LED lamp beads 20.

As shown in fig. 2, 3 and 4, the first encapsulating filler 30 does not affect the light transmission of the LED lamp bead 20, so that the first encapsulating filler 30 can be used for light transmission and is transparent. The first package filler 30 is made of a transparent material, and in this embodiment, is formed by curing a transparent resin adhesive UV glue. In other embodiments, the first encapsulating material 30 may be made of other transparent materials.

As shown in fig. 2, 3 and 4, the first packaging filler 30 is combined with the LED beads 20 and the PCB board 10, and fills between the LED beads 20 to cover the surface of the PCB board 10 and the LED beads 20, so that all the LED beads 20 are wrapped in the first packaging filler 30 to protect the LED beads 20.

In some embodiments, a light diffusion material may be disposed in the first packing 30 to increase the light guiding function of the first packing 30, so that the point light source of each LED bead 20 is converted into a surface light source. During specific implementation, the light diffusion material and the transparent resin adhesive are uniformly mixed and filled between the LED lamp beads 20, and after the transparent resin adhesive is cured, the first packaging filler 30 with the light guide function can be formed.

In some embodiments, a blue-light-resistant material may be further added to the first encapsulating filler 30 to increase the blue-light-resistant effect of the first encapsulating filler 30, so as to reduce the damage of the blue light emitted by the LED to human eyes. During specific implementation, the blue-light-resistant material and the transparent resin adhesive are uniformly mixed and filled between the LED lamp beads 20, and the first packaging filler 30 with the blue-light-resistant function can be formed after the transparent resin adhesive is cured.

As shown in fig. 2, 3 and 4, the second packing filler 40 is disposed on the first packing filler 30 and is spaced apart from the PCB board 10 and the LED lamp bead 20. The second packaging filler 40 is combined with the first packaging filler 30, so that the PCB board 10, the LED lamp bead 20, the first packaging filler 30 and the second packaging filler 40 form an integrated structure.

As shown in fig. 2, 3, and 4, the second encapsulant 40 is used to block light, so as to block light emitted by two adjacent LED beads 20 and block light emitted by LED beads 20 at edge positions outward. In this embodiment, the second encapsulant 40 is formed by curing black UV glue, and is black as a whole to block light, and also has a certain transparency, rather than complete opacity. In other embodiments, the second encapsulant 40 may be made of other materials with light blocking effect, such as black ink cured.

As shown in fig. 2, 3, and 4, the second encapsulating filler 40 is distributed between the LED beads 20 to surround the LED beads 20 within the second encapsulating filler 40. The second encapsulating charge 40 comprises a number of parallel spaced apart transverse encapsulating portions 41 and a number of parallel spaced apart longitudinal encapsulating portions 42. The transverse packing portion 41 and the longitudinal packing portion 42 are perpendicular to each other and combined together to form a rectangular space. The LED beads 20 are distributed in a rectangular space formed by the horizontal packaging part 41 and the vertical packaging part 42. If only separate the LED lamp pearl 20 that keeps off border position, and do not separate each LED lamp pearl 20 respectively, though can avoid the display screen marginal light leak and the bright white line that produces in concatenation department when avoiding the concatenation, however, during the packaging structure concatenation of the novel LED display screen of polylith, the display effect of concatenation department and non-concatenation department then probably is inconsistent, can't guarantee the homogeneity. Therefore, the second packing filler 40 separates and blocks each LED lamp bead 20 in the rectangular space enclosed by the second packing filler to eliminate bright white lines and ensure uniformity.

In this embodiment, as shown in fig. 2, 3, and 4, the distances between the transverse sealing portion 41 and the longitudinal sealing portion 42 are equal to the distance between the LED lamp bead 20, so that a space enclosed between the transverse sealing portion 41 and the longitudinal sealing portion 42 is a square space.

As shown in fig. 2, 3 and 4, the 2 transverse packing parts 41 and the 2 longitudinal packing parts 42 at the extreme edges are used for blocking the LED lamps at the edge positions from emitting light outwards to influence the generation of bright white stripes during splicing. The inner transverse packaging part 41 and the inner longitudinal packaging part 42 are used for blocking light rays emitted by two adjacent LED lamp beads 20 from generating bright white stripes at the intersection. In order to facilitate the assembly of the packaging structures of a plurality of novel LED display screens and ensure the assembled display effect, the thickness T of the 2 transverse packaging parts 41 and the 2 longitudinal packaging parts 42 at the edge positions is set to be half of the thickness of the internal transverse packaging part 41 and the internal longitudinal packaging part 42, so that when the packaging structures of two novel LED display screens are assembled, the thickness of the transverse packaging part 41 or the longitudinal packaging part 42 at the joint position can be kept consistent with the thickness of the internal transverse packaging part 41 or the longitudinal packaging part 42; the half thickness of the transverse packaging part 41 and the longitudinal packaging part 42 at the edge position can still play a role of light blocking so as to avoid light leakage at the edge of the display screen and form bright white stripes.

In order to achieve a good light blocking effect, the following conditions should be satisfied between the second packaging filler 40 and the LED lamp bead 20:

as shown in fig. 3 and 4, an intersection point 0 of light rays corresponding to the maximum light-emitting angle α of two adjacent LED beads 20 is located in the second encapsulant 40; the distance H1 between the bottom of the second packing material 40 and the PCB 10 is smaller than the distance H2 between the top of the packing body of the LED lamp bead 20 and the PCB 10.

The intersection point 0 of the light rays corresponding to the maximum light-emitting angle α of two adjacent LED beads 20 is located in the second encapsulating filler 40, which means that the top F of the second encapsulating filler 40 should be higher than the intersection point 0 of the light rays corresponding to the maximum light-emitting angle α of two adjacent LED beads 20, so that the light rays emitted by two adjacent LED beads 20 can be prevented from interfering on the surface of the display screen to form bright white stripes.

The distance H1 between the bottom of the second packaging filler 40 and the PCB 10 is smaller than the distance H2 between the top of the packaging body of the LED lamp beads 20 and the PCB 10, and the distance H1 is used for ensuring that light rays emitted by two adjacent LED lamp beads 20 cannot intersect under the bottom of the second packaging filler 40, so that the light rays emitted by two adjacent LED lamp beads 20 are thoroughly isolated, and interference of the light rays is avoided to generate bright white stripes.

The height H of the second packing filler 40 meets the above conditions, and can be specifically set according to the size and the spacing distance of the LED lamp beads 20, which is not limited in this embodiment.

The second packing filler 40 is spaced from the PCB 10, which can reduce the material consumption of the second packing filler 40, thereby controlling the ratio of the second packing filler 40 in the whole display screen, and not causing the display screen to be too dark. By reasonably controlling the amount of the second encapsulating filler 40, not only the light blocking effect can be achieved, but also the display contrast can be properly improved.

As shown in fig. 2, 3 and 4, the cross-sectional shape of each of the transverse sealing portion 41 and the longitudinal sealing portion 42 in the second sealing filler 40 may be set as required, and may be, for example, rectangular, trapezoidal, or the like. In the present embodiment, as shown in fig. 3 and 4, it has an inverted trapezoid shape, i.e. the top dimension of the transverse packing part 41 and the longitudinal packing part 42 is larger than the bottom dimension thereof. The size parameters of the transverse packaging part 41 and the longitudinal packaging part 42 can be set according to requirements, in the embodiment, the top sizes of the transverse packaging part 41 and the longitudinal packaging part 42 are less than 0.5mm, and are preferably set to be 0.05 mm-0.2 mm; the bottom dimensions of the transverse and

longitudinal seals

41, 42 are less than 0.3mm, preferably set between 0.03mm and 0.15 mm.

As shown in fig. 2, 3 and 4, when the second encapsulating filler 40 is combined with the first encapsulating filler 30, the second encapsulating filler 40 is flush with the top of the first encapsulating filler 30. In other words, the second encapsulating filler 40 is embedded in the first encapsulating filler 30.

In some embodiments, as shown in fig. 4, an antiglare layer 50 may also be disposed on the surface of the first and

second encapsulant fillers

30, 40. The anti-glare layer 50 is used to eliminate a mirror effect to achieve an anti-glare effect. The material of the anti-glare layer 50 may be the same as the material of the second encapsulant filler 40, for example, in the implementation, when the second encapsulant filler 40 is filled on the first encapsulant filler 30, and the second encapsulant filler 40 is filled on the first encapsulant filler 30 by blade coating, a very thin layer of black glue is formed on the surface of the first encapsulant filler 30, and the black glue is subjected to fine sand grinding mold 60 imprinting treatment, so that the anti-glare layer 50 can be formed to play the anti-glare role.

Therefore, the novel LED display screen packaging structure is formed, and the second light blocking packaging filler 40 is arranged between the packaging structures of the novel LED display screens, so that light leakage at the edges of the packaging structures of the novel LED display screens is avoided, the phenomenon of light emission at the splicing part is avoided during splicing, meanwhile, each LED lamp bead 20 inside is separated and blocked by the second packaging filler 40, the effect equal to that of the edge LED lamp beads 20 can be ensured, the uniformity of the display screen can be ensured, and light rays emitted by two adjacent LED lamp beads 20 can be prevented from interfering with each other to form bright white stripes on the display screen.

The packaging structure of the novel LED display screen can be processed by the following method:

1. arranging an array of LED lamp beads 20 on a PCB 10 by a known process;

2. a mold 60 (shown in fig. 5) is placed, and a material used for the first encapsulating filler 30, such as a transparent resin curing glue, is poured into the mold 60, so as to form the first encapsulating filler 30 between the LED beads 20. The mold 60 is shaped as shown in fig. 5, and has a square peripheral frame 61, which can be placed outside the PCB 10 to enclose the PCB 10 in the cavity therein, so that the mold 60 can be filled with glue to wrap the PCB 10 and the LED beads 20; in addition, the top of the mold 60 is provided with a top mold part 62 with a shape and size corresponding to the second packaging filler 40. The top mold part 62 is joined to the peripheral frame 61 to form the entire mold 60. During operation, glue solution is poured into the mold 60, so that the glue solution covers the PCB 10 and the LED lamp beads 20, and is filled to the top of the mold 60, and the glue solution is flush with the surface of the top mold part 52; subsequently, the first encapsulating filler 30 may be formed by curing the glue by a known process, such as curing by uv exposure, and the like, and then removing the mold 60. The first packaging filler 30, the LED lamp beads 20 and the PCB 10 are combined into a whole, and a groove with the shape consistent with that of the second packaging filler 40 is formed at the top of the first packaging filler 30.

3. Pouring a material used for the second encapsulating filler 40, such as black UV glue, into the surface groove of the first encapsulating filler 30; in this step, the perfusion may be performed by rolling or knife coating. After the filling is finished, scraping off the redundant glue solution on the surface of the first packaging filler 30; the glue is then cured by known processes to form the second encapsulating filler 40.

In some embodiments, further, the above steps may be followed by a surface sanding process to form the antiglare layer 50. In step 3, when the excess glue solution on the surface of the first packaging filler 30 is scraped off, a thin layer of black glue is formed on the surface of the first packaging filler 30, and the black glue is frosted, so that the mirror effect can be eliminated, and the anti-glare effect is realized.

After the above steps are completed, the cutting can be performed according to the size requirement, and the edge portion is cut off, so as to ensure that the thickness of the horizontal sealing portion 41 and the vertical sealing portion 42 at the edge is half of the thickness of the horizontal sealing portion 41 and the vertical sealing portion 42 inside.

While the invention has been described with reference to the above embodiments, the scope of the invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the spirit of the invention.

Claims

1. A novel packaging structure of an LED display screen comprises a PCB (10) and a plurality of LED lamp beads (20) arranged on the PCB (10) in an array arrangement manner, and is characterized in that,

a first packaging filler (30) is arranged between the LED lamp beads (20), and the first packaging filler (30), the LED lamp beads (20) and the PCB (10) are combined together;

the LED packaging structure is characterized in that second packaging fillers (40) are arranged on the first packaging fillers (30), the second packaging fillers (40) are combined with the first packaging fillers (30) and are separated from the LED lamp beads (20) and the PCB (10) to form an integral structure, and the second packaging fillers (40) are distributed among the LED lamp beads (20) to surround the LED lamp beads (20) in the range of the second packaging fillers (40).

2. The novel packaging structure of the LED display screen as claimed in claim 1, wherein the second packaging filler (40) comprises a plurality of parallel spaced transverse packaging parts (41) and a plurality of parallel spaced longitudinal packaging parts (42), and the transverse packaging parts (41) and the longitudinal packaging parts (42) are perpendicular and combined together.

3. The packaging structure of the novel LED display screen according to claim 2, wherein the LED beads (20) are respectively distributed in a rectangular space formed by the transverse packaging part (41) and the longitudinal packaging part (42) in a surrounding manner.

4. The novel LED display screen packaging structure of claim 1,

the first encapsulating filler (30) is used for transmitting light, and the second encapsulating filler (40) is used for blocking light.

5. The novel LED display screen packaging structure of claim 4,

the first packing filler (30) is formed by curing transparent resin glue;

the second packing filler (40) is formed by curing black UV glue or black ink.

6. The novel packaging structure of the LED display screen according to claim 1, wherein the intersection point of the light rays corresponding to the maximum light emitting angle of two adjacent LED beads (20) is located in the second packaging filler (40).

7. The novel packaging structure of the LED display screen according to claim 1, wherein the distance between the bottom of the second packaging filler (40) and the PCB (10) is smaller than the distance between the top of the package body of the LED lamp bead (20) and the PCB (10).

8. The novel packaging structure of the LED display screen as claimed in claim 1, wherein a light diffusion material is arranged in the first packaging filler (30).

9. The novel packaging structure of the LED display screen as claimed in claim 1, wherein the top of the second packaging filler (40) is flush with the top of the first packaging filler (30).

10. The packaging structure of the novel LED display screen according to claim 9, wherein an anti-glare layer (50) is arranged on top of the first packaging filler (30) and the second packaging filler (40).