LED display module and electronic product

Abstract

The utility model provides an LED display module and an electronic product, and the LED display module comprises a circuit board which is provided with a first main surface; the LED light source is fixedly arranged on the first main surface; the shading frame is fixedly arranged on the first main face and provided with at least two light guide holes penetrating in the first direction, LED light sources are correspondingly arranged in the light guide holes, and the circuit board and the shading frame are distributed in the first direction; the circuit board is covered with a low-light-transmitting layer which prevents light of the LED light source from penetrating. The display area comprises a welding area and an insulating area, a metal electrode is arranged in the welding area, the LED light source is connected with the metal electrode, and the display area is an area, exposed in the light guide hole, in the first main surface; the low-transmittance layer comprises a shading layer obtained by covering the first main surface with a shading material, and the shading material at least completely covers the insulating area in the display area. The circuit board is covered with the low-light-transmitting layer, so that light of the LED light source is prevented from penetrating into the circuit board and leaking to different display areas.

Description

Technical Field

[0001] The utility model relates to the field of LED displays, and particularly to an LED display module and an electronic product. Background Art

[0002] Some existing electronic products have an LED display function. One way to implement the LED display function is to install an LED display module such as a digital tube on a main control board, and a user observes the display pattern of the LED display module through a display housing.

[0003] Another way to implement the LED display function is to directly fix LED lamp beads on the main control board in a patch manner, and use a light-shielding frame with light guide holes to guide the light emitted by the LED lamp beads to a set area of the display housing, so as to form a set display pattern on the display housing.

[0004] However, whether it is the first implementation method or the second implementation method, due to the fact that the base material of the circuit board has a certain light transmittance, during use, the light generated by the LED light source can penetrate into the inner base material through the gaps of the copper-plated lines on the surface of the circuit board near the LED light source, or the vias opened on the circuit board, or the through holes opened on the circuit board. The light diffuses inside the PCB base material, and the LED light diffuses from the bright area of the display area to the dark area of the display area, resulting in the dark area becoming brighter, and it is relatively easy to have stray light around the display pattern on the display housing, so the display effect is not good. Summary of the Utility Model

[0005] In a first aspect, in order to overcome the above-mentioned defects of the prior art, the utility model provides an LED display module that reduces the diffusion of light in the circuit board, thereby reducing the stray light around the display pattern on the display housing.

[0006] The LED display module for an electronic product provided by the utility model includes: a circuit board having a first main surface; at least two LED light sources, both fixedly arranged on the first main surface; a light-shielding frame fixedly arranged on the first main surface and having at least two light guide holes penetrating along a first direction, and each light guide hole is correspondingly provided with an LED light source, and the circuit board and the light-shielding frame are distributed along the first direction; the first main surface includes a display area, and the display area is the area of the first main surface exposed in the light guide holes; the circuit board is covered with a low light transmittance layer for preventing the light of the LED light source from penetrating; the display area includes a welding area and an insulating area, a metal electrode is arranged in the welding area, and the LED light source is connected to the metal electrode; the low light transmittance layer includes a light-shielding layer obtained by covering a light-shielding material on the first main surface, and the light-shielding material completely covers at least the insulating area in the display area.

[0007] As can be seen from the above, the LED display module of the present utility model includes a light-shielding frame fixedly arranged on the first main surface of the circuit board and having at least two light-guiding holes penetrating along the first direction. The circuit board and the light-shielding frame are distributed along the first direction, and LED light sources are correspondingly arranged in each light-guiding hole. The circuit board is covered with a low-transmittance layer, and the low-transmittance layer includes a light-shielding layer obtained by covering a light-shielding material on the first main surface. The light-shielding layer covers the first main surface, and the light-shielding material at least completely covers the insulating area in the display area, so that when the LED display module of the present utility model is applied to an electronic product, the light of the LED light source in the display area penetrating into the interior of the circuit board can be reduced by the light-shielding material covered on the first main surface. Under the guiding action of the light-guiding holes of the light-shielding frame, the light of the LED light source is gathered and propagated along the light-guiding holes, thereby reducing the diffusion of the light in the display area inside the circuit board and then leaking and straying into different display areas, and further reducing the stray light around the display pattern on the display housing.

[0008] A preferred solution is that the circuit board is provided with a hole channel extending from the first main surface in a direction opposite to the first direction; the hole channel is provided outside the range of the display area.

[0009] As can be seen from the above, on the basis that the light-shielding material completely covers the insulating area in the display area, the hole channels opened on the circuit board are further moved outside the range of the display area, avoiding the light of the LED light source diffusing into the interior of the circuit board through the hole channels, and further reducing the leakage and straying of light into different display areas.

[0010] A further solution is that the circuit board includes at least two circuit layer boards distributed along the first direction; the at least two circuit layer boards include a bottom layer board, a first layer board, and multiple circuit layer boards located between the first layer board and the bottom layer board. The first layer board is located on the side of the at least two circuit layer boards closest to the light-shielding frame; the bottom layer board is located on the side of the at least two circuit layer boards away from the light-shielding frame; the hole channel is a via hole extending from the first main surface in a direction opposite to the first direction to any layer of the circuit layer boards, and the via hole is used to connect the conductors of different circuit layer boards; or, the hole channel is a through hole penetrating the circuit board in a direction opposite to the first direction, and the devices on the circuit board pass through the through hole and are fixedly connected to the circuit board.

[0011] A preferred solution is that the circuit board includes at least two circuit layer boards, the at least two circuit layer boards include a second layer board and a third layer board, the third layer board and the second layer board are distributed along the first direction, and the second layer board is located on the side of the at least two circuit layer boards closest to the light-shielding frame; the low-transmittance layer further includes a ground wire layer obtained by covering the copper foil used as the ground wire on the side of the circuit board away from the light-shielding frame, and the copper foil at least completely covers the light-blocking area of the third layer board, and the light-blocking area corresponds to the area jointly formed by the display area on the first main surface and the area where the light-shielding frame is installed.

[0012] As can be seen from the above, the low light-transmission layer further includes a ground wire layer obtained by covering a copper foil on the side of the circuit board away from the light-shielding frame, and at least completely covers the light-blocking area of the third-layer board. Using this copper foil as the light-blocking layer, when the light of the LED light source enters the circuit board, the copper foil covered on the layer board for light-blocking can block and reflect the light, preventing the light from continuing to spread inside the circuit board, thereby suppressing the light in the display area from spreading inside the circuit board and reducing the occurrence of leakage and stray light to different display areas.

[0013] A preferred solution is that the light-shielding layer includes at least two light-shielding materials coated on the first main surface in sequence; among them, the light-shielding material coated first on the first main surface is black; after the light-shielding materials are coated, the light-shielding material closest to the light-shielding frame is used to reflect the light of the LED light source.

[0014] A preferred solution is that the LED light source is an LED lamp bead, and the LED lamp bead is connected to the metal electrode on the circuit board through a metal pin; or, the LED light source is an LED chip, and the LED chip is connected to the metal electrode on the circuit board through a metal wire.

[0015] A preferred solution is that the light-shielding frame is closely fitted with the first main surface.

[0016] A preferred solution is that the circuit board is the main control board of the electronic product.

[0017] A further solution is that the light-shielding material is ink, and the light-shielding layer includes black ink and white ink screen-printed on the first main surface in sequence, where the ink screen-printed first on the first main surface is black; the thickness of the light-shielding layer obtained by screen-printing black ink and white ink on the first main surface in sequence is greater than 5 microns and less than 20 microns; or, the thickness of the light-shielding layer is equal to 5 microns; or, the thickness of the light-shielding layer is equal to 20 microns.

[0018] In a second aspect, in order to overcome the above defects of the prior art, the present invention also provides another LED display module that reduces the diffusion of light in the circuit board, thereby reducing the stray light around the display pattern on the display surface shell.

[0019] The LED display module for electronic products provided by the present utility model includes: a circuit board having a first main surface; at least two LED light sources fixed on the first main surface; a light-shielding frame fixed on the first main surface and having at least two light-guiding holes penetrating along a first direction, with an LED light source correspondingly disposed in each light-guiding hole, the circuit board and the light-shielding frame being distributed along the first direction; the first main surface includes a display area, and the display area is the area of the first main surface exposed in the light-guiding holes; the circuit board is covered with a low-transparency layer for preventing the light of the LED light sources from penetrating; the circuit board includes at least two circuit laminates, and the at least two circuit laminates include a first laminate and a second laminate, the second laminate and the first laminate being distributed along the first direction, and the first laminate is located on the side of the at least two circuit laminates closest to the light-shielding frame; the low-transparency layer further includes a ground wire layer obtained by covering a copper foil on the side of the circuit board away from the light-shielding frame, and the copper foil at least completely covers the light-blocking area corresponding to the area jointly formed by the display area of the first main surface and the area where the light-shielding frame is installed.

[0020] As can be seen from the above, the low-transparency layer further includes a ground wire layer formed by covering a copper foil used as a ground wire on the side of the circuit board away from the light-shielding frame, and the copper foil at least completely covers the light-blocking area. Using this copper foil as a light-blocking layer, when the light of the LED light source enters the circuit board, the copper foil can block the light and prevent the light from continuing to spread inside the circuit board. Thus, by selecting the low-transparency layer as the ground wire layer formed by covering a copper foil on the side of the circuit board away from the light-shielding frame, at least the light-blocking area of the circuit laminate for light-blocking is completely covered by the copper foil, and the light-blocking effect is achieved by using this copper foil, suppressing the spread of the light in the display area inside the circuit board and reducing the occurrence of leakage and stray light to different display areas.

[0021] A preferred solution is that the circuit board is provided with a hole extending from the direction opposite to the first direction of the first main surface; the hole is provided outside the range of the light-blocking area of the circuit board.

[0022] A further solution is that the at least two circuit laminates further include a bottom laminate and multiple circuit laminates located between the first laminate and the bottom laminate; the bottom laminate is located on the side of the at least two circuit laminates away from the light-shielding frame; the hole is a via hole extending from the first main surface in the direction opposite to the first direction to any layer of the circuit laminates, and the via hole is used to connect the conductors of different circuit laminates; or, the hole is a through hole penetrating the circuit board in the direction opposite to the first direction, and after the device on the circuit board passes through the through hole, it is fixedly connected to the circuit board.

[0023] In a third aspect, in order to overcome the above-mentioned defects of the prior art, the present utility model provides an electronic product.

[0024] The electronic product provided by the present utility model includes a display front shell, and further includes an LED display module as in the first aspect, or includes an LED display module as in the second aspect. The LED display module is fixedly arranged inside the display front shell. Description of the Drawings

[0025] Figure 1 is a perspective view of an embodiment of the electronic product of the present utility model;

[0026] Figure 2 is an exploded view of an embodiment of the electronic product of the present utility model;

[0027] Figure 3 is a partial exploded view (hiding the shell) of an embodiment of the electronic product of the present utility model;

[0028] Figure 4 is a perspective cross-sectional view and a partial enlarged view of an embodiment of the LED display module of the present utility model;

[0029] Figure 5 is a schematic cross-sectional view of an LED display module in Embodiment 1 of the LED display module of the present utility model;

[0030] Figure 6 is another schematic cross-sectional view of an LED display module in Embodiment 1 of the LED display module of the present utility model;

[0031] Figure 7 is a schematic cross-sectional view of an LED display module in Embodiment 2 of the LED display module of the present utility model;

[0032] Figure 8 is a schematic cross-sectional view of an LED display module in Embodiment 3 of the LED display module of the present utility model;

[0033] Figure 9 is a schematic cross-sectional view of an LED display module in Embodiment 4 of the LED display module of the present utility model. Detailed Embodiments

[0034] In this embodiment, Figures 1 to 4 a unified spatial rectangular coordinate system (right-handed system) is adopted to represent the relative orientation relationship between the features. Among them, the Z-axis direction is the first direction.

[0035] For the convenience of description, the electronic product in this embodiment is specifically described by taking an intelligent skipping rope as an example. Optionally, in other embodiments of the present utility model, the electronic product may also be a dehumidifier, a shaver, an electric toothbrush, etc. The electronic product applied herein is not limited herein.

[0036] Please refer to Figures 1 to 4, the handle of the intelligent skipping rope includes a housing 1, an inner housing 2, and the LED display module 3 of this embodiment. The housing 1 is a cylindrical structure with its center line along the X-axis direction. The main structure of the housing 1 is integrally injection-molded from PC plastic (polycarbonate), and a semi-transparent film (not shown in the figure) is attached to its surface. This semi-transparent film can be attached to the inner or outer surface of the main structure of the housing 1 by means such as spraying, electroplating, in-mold insert injection molding, etc., so that the whole housing 1 presents the color of the semi-transparent film. For example, this semi-transparent film is a white ink layer sprayed on the surface of the PC plastic. Optionally, in other embodiments of the present invention, the main structure of the housing 1 can also be integrally injection-molded from light-transmitting materials such as glass, acrylic, ABS plastic, PVC plastic, PET plastic, etc.

[0037] The setting of the semi-transparent film enables that except for the display pattern of the LED display module 3 being presented on the surface of the housing 1 in the on state, the user cannot observe the internal structure of the housing 1, which is beneficial to making the appearance structure of the handle simple. Optionally, in other embodiments of the present invention, the semi-transparent film can also be cancelled, and the light transmittance of the housing can also be specifically set as required.

[0038] The inner housing 2 and the LED display module 3 are both fixedly arranged in the cylindrical cavity of the housing 1. The inner housing 2 is a cylindrical structure mainly composed of a first half-shell 21 and a second half-shell 22. The center line of the inner housing 2 is along the X-axis direction. The outer contour shape and size of the inner housing 2 match the inner contour shape and size of the housing 1. The second half-shell 22 is fixed to the positive Z-axis side of the first half-shell 21 by screws (not shown in the figure). The first half-shell 21 and the second half-shell 22 enclose an installation cavity 23. The second half-shell 22 has a display window hole 221 communicating the inside and outside of the installation cavity 23 along the Z-axis direction. The LED display module 3 is fixedly arranged in the installation cavity 23 of the inner housing 2. The display module 3 is located in the display window hole 221 and exposed on the positive Z-axis side surface of the inner housing 2.

[0039] The LED display module 3 of this embodiment includes a circuit board 31, an LED light source, and a light-shielding frame 32. The normal line of the main surface of the circuit board 31 is along the Z-axis direction. The LED light source and the light-shielding frame 32 are both fixedly arranged on the positive Z-axis side main surface (an example of the first main surface) of the circuit board 31. The normal line of the end surface at the negative Z-axis end of the light-shielding frame 32 is along the Z-axis direction. The negative Z-axis end surface of the light-shielding frame 32 is closely attached to the positive Z-axis side main surface of the circuit board 31 and fixedly connected by gluing. Optionally, in other embodiments of the present invention, the light-shielding frame can also be fixedly connected to the circuit board by other means such as screws, and the light-shielding frame and the circuit board can also be closely fitted by means such as extrusion gaskets to prevent the light emitted by the LED light source from leaking through the gap between the circuit board and the light-shielding frame.

[0040] In the embodiment of the present utility model, the circuit board 31 is the main control board of the intelligent skipping rope. Optionally, in other embodiments of the present utility model, the circuit board can also be an independent board body electrically connected to the main control board of the electronic product, and this independent board body is dedicated to the LED display module. At this time, the LED display module is connected to the main control board of the intelligent skipping rope as an independent module.

[0041] In this embodiment, the first half shell 21 has four first mounting posts 211 extending along the positive Z-axis direction into the mounting cavity 23, and the circuit board 31 is fixed to the positive Z-axis ends of the first mounting posts 211 by screws (not shown in the figure). On the inner peripheral wall of the outer shell 1, there is a guiding groove (not shown in the figure) extending along the X-axis direction, and on the outer peripheral wall of the inner shell 2, there is a guiding convex portion (not shown in the figure) cooperating with the guiding groove. The combination of the inner shell 2 and the LED display module is inserted into the cylindrical cavity of the outer shell 1 along the positive X-axis direction. Of course, during the process of inserting the combination of the inner shell 2 and the LED display module into the inner cavity of the outer shell 1, it is necessary to align the guiding convex portion with the guiding groove along the X-axis direction so that the guiding protrusion can slide into the cylindrical cavity of the outer shell 1 along the guiding groove.

[0042] After the combination of the inner shell 2 and the LED display module is inserted into the inner cavity of the outer shell 1, the ends of the outer shell 1 and the inner shell 2 are fixedly connected by screws (not shown in the figure). The light emitted by the LED light source is emitted to the outer shell 1 through the light guiding holes and is finally displayed on the outer peripheral wall surface on the positive Z-axis side of the outer shell 1.

[0043] The light shielding frame 32 in this embodiment includes a first light shielding frame 321 and a second light shielding frame 322, and the connection between the first light shielding frame 321 and the second light shielding frame 322 is in plug-in fit; an elastic mechanism can be provided between the first light shielding frame 321 and the second light shielding frame 322. The elastic mechanism can be a spiral compression spring, a leaf spring, an elastic silica gel, etc. The positive Z-axis end of the elastic mechanism abuts against the second light shielding frame 322, and the negative Z-axis end of the elastic mechanism abuts against the first light shielding frame 321. The second light shielding frame 322 is exposed on the positive Z-axis side of the inner shell 2 through the display window hole 221 under the abutting action of the elastic mechanism and abuts against the inner peripheral wall surface of the outer shell 1. In this way, the light shielding frame adopts the plug-in fit structure of the first light shielding frame 321 and the second light shielding frame 322, and can more flexibly extend the light shielding / light guiding length, for example, extend to a degree of being closely fitted with the display surface shell, reducing the leakage and stray degree when the LED light source propagates to the display surface shell; further, the cooperation between the first light shielding frame 321 and the second light shielding frame 322 can ensure a good light shielding effect at the plug-in fit part without closely fitting the connection between the first light shielding frame 321 and the second light shielding frame 322. This also enables the light guiding holes and the outside to exchange air through the gap between the plug-in fit connection between the first light shielding frame 321 and the second light shielding frame 322, which is conducive to the heat dissipation of the LED light source and is conducive to improving the heat dissipation performance of this embodiment.

[0044] In other embodiments of the present utility model, the light-shielding frame 32 can also be a light-shielding frame with a fixed length formed integrally; in this embodiment of the present utility model, the surface of the light-shielding frame 32 close to the display surface shell is set to be arc-shaped, so as to achieve better fitting between the light-shielding frame and the display surface shell. In other embodiments, the surface of the light-shielding frame close to the display surface shell can be set to be arc-shaped or straight-plane, and no limitation is made here.

[0045] It should be noted that when the LED display module of this embodiment is not installed on the electronic product, the socket fit between the first light-shielding frame 321 and the second light-shielding frame 322 can move relative to each other along the Z-axis direction; however, when the LED display module is installed on the electronic product, its various components tend to be fixed relative to the shell of the electronic product. Therefore, at this time, the socket fit between the first light-shielding frame 321 and the second light-shielding frame 322 often cannot move relative to each other along the Z-axis direction anymore.

[0046] The LED light source of this embodiment is specifically an LED chip 33. The LED chip 33 is connected to the metal electrode 34 on the circuit board 31 through a metal wire (not shown in the figure). The specific installation method of the LED chip 33 on the circuit board 31 can refer to the prior art and will not be elaborated here.

[0047] In the present utility model, the light-shielding frame 32 has at least two light-guiding holes 323 penetrating along the Z-axis direction; the light-guiding holes 323 include a first hole (not shown in the figure) penetrating along the Z-axis direction on the first light-shielding frame 321 and a second hole (not shown in the figure) penetrating along the Z-axis direction on the second light-shielding frame 322, and the first hole is docked with the corresponding second hole to form a light-guiding hole. The LED chip 33 is located in the light-guiding hole 323, and a potting material 35 is filled in a part of the hole section of the light-guiding hole 323 near the negative Z-axis end, and the potting material 35 completely covers the LED chip 33 and the part of the circuit board 31 exposed in the light-guiding hole 323; Optionally, in other embodiments of the present utility model, the LED light source can also be an LED lamp bead, and the LED lamp bead is mounted on the main surface of the positive Z-axis side of the circuit board in an existing manner such as by soldering, and at this time, the potting material can be cancelled. Of course, it is preferably to use the potting material 35 to completely cover the LED light source and the part of the circuit board 31 exposed in the light-guiding hole 323. The setting of the potting material 35 is beneficial to protecting the LED light source on the one hand, and on the other hand, enables the present utility model to uniformly disperse the light emitted by the LED light source to the surface of the potting material 35 by selecting a suitable potting material 35, so that the light emitted by the LED light source is uniformly dispersed and propagated in the light-guiding hole 323. In this way, when the LED display module 3 is applied to an electronic product, it is beneficial to make the display pattern on the display surface shell of the electronic product have uniform brightness and darkness; Of course, it is more preferably to use the LED chip 33 as the LED light source in this embodiment, and use the potting material 35 to completely cover the LED chip 33 and the part of the circuit board 31 exposed in the light-guiding hole 323. In this way, on the one hand, the potting material 35 can protect the LED chip 33 and the metal wires, and on the other hand, since the size of the LED chip 33 can be made smaller than that of the LED lamp bead, this embodiment can also set the size of the light-guiding hole 323 small enough (if the LED lamp bead is used as the LED light source, in order to accommodate the LED lamp bead therein, the size of the light-guiding hole 323 has to be set larger). This is not only beneficial to realizing the display of smaller patterns through light guiding by the light-guiding hole 323, but also beneficial to increasing the distance between adjacent light-guiding holes 323 and reducing the heat generation speed of the LED light source.

[0048] Optionally, in other embodiments of the present utility model, a light reflecting surface is formed on the hole wall at the negative Z-axis end of the light-guiding hole. The light reflecting surface surrounds the LED chip and is inclined towards the hole opening at the positive Z-axis end of the light-guiding hole. The potting material partially or completely covers the light reflecting surface. In this way, the light reflecting surface functions as a light cup, enabling the light irradiated thereon to be reflected towards the hole opening at the positive Z-axis end of the light-guiding hole, which is beneficial to making more light emitted by the LED chip propagate towards the hole opening at the positive Z-axis end of the light-guiding hole and is beneficial to improving the display brightness of the LED display module.

[0049] The first light-shielding frame 321 and the second light-shielding frame 322 of this embodiment are both made of black material. Optionally, in an embodiment where the first light-shielding frame has a light-reflecting surface, it is preferably to set the surface color of the first light-shielding frame to an easily reflective color such as white, and set the surface color of the second light-shielding frame to a dark color such as black.

[0050] In this embodiment, the number of light guide holes 323 is 21, and each light guide hole 323 is distributed along the stroke extension direction of the number "888". Each light guide hole 323 corresponds to an LED chip 33. Optionally, in other embodiments of the present invention, the cross-sectional shape and distribution law of the light guide holes can be adjusted according to the needs of the display pattern.

[0051] Please refer to Figure 5 and Figure 6 , in this embodiment, a method for reducing the light emitted by the LED light source from entering the interior of the circuit board will be introduced. By covering the circuit board with a low-transparency layer, the low-transparency layer is used to prevent the light of the LED light source from penetrating. The low-transparency layer can specifically be a light-absorbing light-shielding material, such as dark epoxy resin, silicone resin or silica gel, etc. The low-transparency layer can also be a light-reflecting light-shielding material, such as a metal layer, white epoxy resin, silicone resin or silica gel, etc. The low-transparency layer covers the first main surface and / or the side of the circuit board away from the light-shielding frame, thereby avoiding the diffusion of light inside the circuit board, minimizing the leakage and stray of the light emitted by the LED light source to different display areas, and further reducing the stray light around the display pattern on the display housing.

[0052] In this embodiment, the main surface on the positive Z-axis side of the circuit board 31 (an example of the first main surface) includes a display area (not shown in the figure), specifically the area on the first main surface that is exposed in the light guide holes. The display area includes a welding area (not shown in the figure) and an insulating area (not shown in the figure). Metal electrodes are provided in the welding area, and the LED light source is connected to the metal electrodes. This welding area is the area for welding and fixing the LED light source. After the LED is welded to the metal electrodes on the welding area, the electrical connection with the circuit on the circuit board is realized. Specifically, the metal electrodes in the welding area can be pads provided on the first main surface.

[0053] In this embodiment, the low light-transmitting layer includes a light-shielding layer M5 obtained by coating a light-shielding material on the first main surface. The light-shielding layer M5 covers the first main surface, and the light-shielding material fully covers at least the insulating region in the display area; wherein, the LED light source is fixedly arranged in the display area; the display area is the area on the first main surface that is exposed in the light guide hole 323; that is, the light-shielding material fully covers at least the area on the first main surface that is exposed in the light guide hole 323 and is not a pad. In this embodiment, the LED light source is an LED chip 33. The two electrodes on the LED chip 33 are respectively connected to two different metal electrodes of the circuit board through metal wires. The positive electrode is correspondingly connected to the positive metal electrode on the circuit board, and the negative electrode is correspondingly connected to the negative metal electrode on the circuit board; since the size of the LED chip 33 is small, the two welding areas for welding the LED chip 33 are relatively close, and the bottom of the LED chip 33 attached to the circuit board is light-tight. Optionally, in other embodiments of the present invention, the light-shielding material can also fully cover the area enclosed by the welding area and the light-shielding frame in the display area.

[0054] As can be seen from the above, in the LED display module of the present invention, since the light-shielding material is coated on the first main surface of the circuit board, and the light-shielding material fully covers at least the insulating region in the display area, when the LED display module of the present invention is applied to electronic products, the light of the LED light source in the display area can be reduced from penetrating into the interior of the circuit board by the light-shielding material coated on the first main surface. Under the guiding action of the light guide hole of the light-shielding frame, the light of the LED light source is concentrated and propagated along the light guide hole. Under the action of the low light-transmitting layer covering the circuit board, after the light in the display area diffuses inside the circuit board, the leakage and stray light to different display areas are reduced, and further the stray light around the display pattern on the display surface shell is reduced.

[0055] Preferably, in this embodiment, the light-shielding material can be a screen printing material. For example, the light-shielding material is black ink. Before the operator welds the LED light source of this embodiment and installs the light-shielding frame 32, the first main surface of the circuit board 31 is first screen-printed, so that the black ink is screen-printed on the designated area of the first main surface (specifically the area described above), and then the LED light source is welded and the light-shielding frame 32 is installed; Optionally, in other embodiments of the present invention, methods such as dispensing, stencil printing or spraying can be used; wherein, the light-shielding material can specifically be a dark light-shielding material, preferably a black material. Further, the light-shielding material can be at least one of epoxy resin, silicone resin or silica gel and adding light-impermeable materials such as TIO2; the filling of the light-shielding material can be in the display area or on the entire first main surface of the circuit board. At least setting the light-shielding material in the insulating region in the display area is beneficial to reducing the light from penetrating into the interior of the circuit board, and further reducing the leakage and stray light between different display areas.

[0056] Optionally, in this embodiment of the present utility model, the light-shielding layer can be obtained by coating a light-shielding material on the first main surface, that is, the light-shielding layer is a single-layer structure, such as black ink, black epoxy resin, dark silicone resin, etc. coated on the first main surface; in other embodiments of the present utility model, the light-shielding layer can also be obtained by sequentially coating multiple different light-shielding materials, that is, the light-shielding layer is a multi-layer structure. Optionally, in other embodiments of the present utility model, the light-shielding layer can also be obtained by pasting or heat-bonding a light-shielding material or multiple different prefabricated light-shielding materials onto the first main surface. It should be noted that different light-shielding materials can have the same material composition but different colors; or the same color but different material compositions; or different colors and different material compositions.

[0057] Specifically, when the light-shielding layer is a multi-layer structure, that is, the light-shielding layer includes at least two light-shielding materials sequentially coated on the first main surface; among them, the light-shielding material first coated on the first main surface is used to absorb light, such as black; the last coated light-shielding material is used to reflect light, that is, after the light-shielding materials are coated, the light-shielding material closest to the light-shielding frame is the light-shielding material capable of reflecting light, which is used to reflect the light of the LED light source; specifically, the light-shielding layer can be obtained by coating two different light-shielding materials. The light-shielding material on the side close to the light-shielding frame can be a material capable of reflecting light, such as white ink, silver ink, white epoxy resin, white silicone resin, etc.; the light-shielding material on the side close to the circuit board is a material capable of absorbing light, that is, the light-shielding material first coated on the first main surface is a material capable of absorbing light, such as dark materials like black ink, dark green ink, black epoxy resin, dark blue silicone resin, etc., and the light-shielding material last coated on the first main surface is a material capable of reflecting light, such as white ink, silver ink, white epoxy resin, white silicone resin, etc. In this way, on the basis of preventing the light of the LED light source from penetrating into the circuit board, part of the light of the LED light source can be further reflected, improving the brightness of the display area.

[0058] Specifically, the light-shielding layer includes black ink and white ink sequentially screen-printed on the first main surface. Among them, the ink first screen-printed on the first main surface is black, and then the white ink is screen-printed on the black ink. Among them, the thickness of the light-shielding layer obtained by sequentially screen-printing black ink and white ink on the first main surface is greater than 5 microns and less than 20 microns; or, the thickness of the light-shielding layer is equal to 5 microns; or, the thickness of the light-shielding layer is equal to 20 microns. By screen-printing the ink on the first main surface to form the light-shielding layer, it is possible to achieve a light-shielding effect while realizing a relatively thin coating effect. Moreover, the light-shielding layer obtained by screen-printing the ink on the first main surface further improves the coating accuracy, flatness, and production efficiency of the light-shielding material.

[0059] Furthermore, in this embodiment, the holes formed in the circuit board are moved outside the display area, thus preventing the light of the LED light source from passing through the holes into the interior of the circuit board and diffusing inside the circuit board, further reducing the light leakage and stray light of the LED light source to different display areas.

[0060] Specifically, the circuit board 31 is provided with holes 311, and the holes 311 extend from the first main surface in a direction opposite to the first direction Z; the holes 311 are formed outside the display area; wherein, the circuit board includes at least two circuit layer boards distributed along the first direction Z; the at least two circuit layer boards include a bottom layer board M4, a first layer board M1, and multiple circuit layer boards located between the bottom layer board M4 and the first layer board M1, and the first layer board M1 is located on the side of the circuit board closest to the light-shielding frame 32; the holes 311 are vias extending from the first main surface in a direction opposite to the first direction Z to any layer of the circuit layer board, and the vias are used to connect the conductors of different circuit layer boards; or, the holes 311 are through holes penetrating the circuit board 31 in a direction opposite to the first direction Z, and the devices 36 on the circuit board 31 pass through the through holes and are fixedly connected to the circuit board; specifically, the holes 311 can be formed in the area of the circuit board 31 corresponding to the light-shielding frame 32, and among them, the holes 311 formed in this area can only be used to connect the conductors of different circuit layer boards; the holes 311 can also be formed in the device fixing area of the circuit board, and the circuit board includes a device fixing area, a display area, and an area corresponding to the light-shielding frame 32.

[0061] It should be noted that the device fixing area can be used to fix other electronic components, can also be used for screws to pass through for fixing, and can also be used for wires to pass through for fixing, which is not limited here.

[0062] Furthermore, referring to the attached Figure 7 As shown, on the basis of including the light-shielding material provided on the first main surface, the low-transmittance layer in this embodiment further includes a ground wire layer obtained by covering the copper foil used as the ground wire on the side of the circuit board away from the light-shielding frame, and on the layer board for blocking light, the copper foil at least completely covers the light-blocking area. When the light of the LED light source enters the interior of the circuit board, the copper foil can block and reflect the light, preventing the light from continuing to diffuse inside the circuit board.

[0063] In this embodiment, the circuit board is a multi-layer circuit board. The circuit board 31a includes at least two circuit layer boards. The at least two circuit layer boards include a second layer board M1a and a third layer board M2a. The third layer board M2a and the second layer board M1a are distributed along the first direction, and the second layer board M1a is located on the side of the at least two circuit layer boards closest to the light-shielding frame; the low-transmittance layer further includes a ground wire layer obtained by covering the copper foil used as the ground wire on the side of the circuit board away from the light-shielding frame, and the copper foil at least completely covers the light-blocking area of the third layer board M2a, and the light-blocking area corresponds to the area jointly formed by the display area on the first main surface and the area where the light-shielding frame is installed.Figure 7 The Za-axis directions therein respectively correspond to the Z-axis directions in the previous embodiment.

[0064] Optionally, in other embodiments of the present application, the copper foil can completely cover the third layer board M2a.

[0065] Optionally, in other embodiments of the present application, the third layer board can also be M3a, and the third layer board can also be any layer board between the layer board closest to the light shielding frame and the layer board farthest from the light shielding frame along the Za-axis direction in the multi-layer circuit board; wherein, the closer the layer board that blocks light by covering the copper foil is to the LED light source along the Za-axis direction, the less the light of the LED light source is reflected by the copper foil of the layer board to other display areas, and the better the light blocking effect. Preferably, the layer board closest to the second layer board M1a along the Za-axis direction, that is, M2a, is adopted.

[0066] As can be seen from the above, the low light transmission layer further includes a copper foil for serving as a ground wire, and the copper foil completely covers at least the light blocking area of the third layer board, and the light is blocked and reflected by the copper foil covered on the third layer board when the light of the LED light source enters the circuit board, so as to avoid the light continuing to spread inside the circuit board, thereby suppressing the light in the display area from spreading inside the circuit board and reducing the occurrence of leakage and stray to different display areas.

[0067] Further, as shown in the appendix Figure 8 The low light transmission layer of this embodiment includes a light shielding layer obtained by covering a light shielding material on the first main surface. The low light transmission layer can further include a ground wire layer obtained by covering a copper foil on the side of the circuit board away from the light shielding frame, and on the layer board for blocking light, the copper foil completely covers at least the light blocking area. At the same time, the holes opened on the circuit board are moved outside the range of the display area, so as to avoid the light of the LED light source from penetrating into the circuit board through the holes, and when the light of the LED light source is too strong and partially penetrates into the circuit board through the light shielding material, the copper foil on the layer board for blocking light can block the light; further reducing the leakage and stray of the light of the LED light source to different display areas.

[0068] Specifically, the circuit board 31b is provided with a hole 311b, and the hole 311b extends from the first main surface in a direction opposite to the first direction Z; the hole 311b is provided outside the range of the display area; wherein, the circuit board includes at least two circuit layer boards distributed along the first direction Zb; the at least two circuit layer boards include a bottom layer board M4b, a first layer board M1b, and multiple circuit layer boards located between the bottom layer board M4b and the first layer board M1b, and the first layer board M1b is located on the side of the circuit board closest to the light-shielding frame 32b; the hole 311b is a via hole extending from the first main surface in a direction opposite to the first direction Z to any layer of the circuit layer board, and the via hole is used to connect the conductors of different circuit layer boards; or, the hole 311b is a through hole penetrating the circuit board 31b in a direction opposite to the first direction Zb, and the device 36b on the circuit board 31b passes through the through hole and is fixedly connected to the circuit board; specifically, the hole 311b can be provided in the area of the circuit board 31b corresponding to the light-shielding frame 32b, wherein the hole 311b provided in this area can only be used to connect the conductors of different circuit layer boards; the hole 311b can also be provided in the device fixing area of the circuit board, and the circuit board includes a device fixing area, a display area, and an area corresponding to the light-shielding frame 32b.

[0069] In this embodiment, the multiple circuit layer boards located between the bottom layer board M4b and the first layer board M1b include a second layer board M2b and a third layer board M3b; meanwhile, the second layer board M2b is covered with a copper foil serving as a ground wire, and the copper foil covers at least the light-blocking area of the second layer board M2b, and the light-blocking area corresponds to the area jointly formed by the display area of the first main surface and the area where the light-shielding frame is installed. Figure 8 The Zb-axis directions in [description] respectively correspond to the Z-axis directions in the previous embodiment.

[0070] Optionally, in other embodiments of the present application, a copper foil serving as a ground wire can also be covered on the third layer board M3b.

[0071] Please refer to Figure 9 , in another embodiment of the present invention, a method for blocking the diffusion of the light emitted by the LED light source inside the circuit board is introduced. The low-light-transmission layer is a ground wire layer obtained by covering a copper foil used as a ground wire on the side of the circuit board away from the light-shielding frame. When the light of the LED light source enters the inside of the circuit board, the copper foil covered on the layer board for light blocking can block the light, avoid the continuous diffusion of the light inside the circuit board, and minimize the leakage and stray of the light emitted by the LED light source to different display areas, thereby reducing the stray light around the display pattern on the display surface shell.

[0072] In the LED display module 3c for electronic products provided in this embodiment of the present utility model, it includes: a circuit board having a first main surface; at least two LED light sources, both fixedly arranged on the first main surface; a light-shielding frame 32c, fixedly arranged on the first main surface and having at least two light-guiding holes 323c penetrating along a first direction, and each light-guiding hole 323c is correspondingly provided with an LED light source, the circuit board 31c and the light-shielding frame 32c are distributed along the first direction; the first main surface includes a display area, and the display area is the area on the first main surface exposed in the light-guiding holes 323c; the circuit board 31c includes at least two circuit layer boards, and the at least two circuit layer boards include a first layer board M1c and a second layer board M2c, the first layer board M1c and the second layer board M2c are distributed along a first direction Z, and the first layer board M1c is located on the side of the circuit board 31c closer to the light-shielding frame 32c; the low-light-transmission layer further includes a ground wire layer obtained by covering the copper foil used as the ground wire on the side of the circuit board away from the light-shielding frame, and the copper foil (the black part shown in the figure) at least completely covers the light-blocking area of the second layer board M2c, and the light-blocking area corresponds to the area jointly formed by the display area of the first main surface and the area where the light-shielding frame is installed; the LED light sources are fixedly arranged in the display area. Figure 9 The Zc-axis direction in it corresponds to the Z-axis direction in the previous embodiment respectively.

[0073] Optionally, in other embodiments of the present application, the copper foil can also completely cover the second layer board M2c.

[0074] Optionally, in other embodiments of the present application, the second layer board can also be M3c, and the second layer board can also be any layer board between the layer board closest to the light-shielding frame in the multi-layer circuit board and the layer board farthest from the light-shielding frame along the Zc-axis direction in the multi-layer circuit board; the closer the circuit layer board for light blocking covered by the copper foil is to the LED light source along the Zc-axis direction, the less the light of the LED light source is reflected by the copper foil to other display areas, and the better the effect of using the copper foil for light blocking, and it is preferably the layer board closest to the first layer board M1c along the Zc-axis direction, that is, M2c.

[0075] In this embodiment, the circuit board 31c includes four layers, specifically the first layer board M1c, the second layer board M2c, the third layer board M3c and the fourth layer board M4c, and the fourth layer board M4c is the bottom layer board. In other embodiments of the present utility model, the circuit board can include multiple circuit layer boards between the first layer board and the bottom layer board.

[0076] As described above, the low light transmission layer is a ground wire layer obtained by covering a copper foil on the side of the circuit board away from the light shielding frame, and the copper foil fully covers at least the light shielding area in the circuit layer board for light shielding. The copper foil is used to block light. When the light of the LED light source enters the circuit board, the copper foil can block the light and prevent the light from spreading further inside the circuit board. In this way, the light in the display area is inhibited from spreading inside the circuit board, reducing leakage and stray light to different display areas.

[0077] In this embodiment, the circuit board 31c is provided with a hole 311c that extends from the first main surface in a direction opposite to the first direction Zc; the hole 311c is provided outside the range of the light shielding area in the circuit board 31c; wherein, at least two circuit layer boards include the first layer board M1c, the bottom layer board M4c, and multiple circuit layer boards located between the first layer board M1c and the bottom layer board M4c; the hole 311c is a via hole that extends from the first main surface in a direction opposite to the first direction Zc to any layer in the circuit layer board, and the via hole is used to connect the conductors of different circuit layer boards; or, the hole 311c is a through hole that penetrates the circuit board in a direction opposite to the first direction Zc. After the device 36c on the circuit board passes through the through hole, it is fixedly connected to the circuit board.

[0078] It should be noted that the specific descriptions of the hole and the circuit board are as in the previous embodiment, and will not be elaborated here.

[0079] In this embodiment, the LED light source is an LED chip 33c. For the light shielding frame and the LED light source, refer to the description of the previous embodiment, and will not be elaborated here.

[0080] In this embodiment, by arranging the holes on the circuit board outside the range of the light shielding area in the circuit board, the light of the LED light source is prevented from passing through the holes and spreading inside the circuit board, minimizing the leakage and stray light of the light of the LED light source.

[0081] Finally, it should be emphasized that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An LED display module for electronic products, comprising: A circuit board having a first main surface; At least two LED light sources fixed on the first main surface; It is characterized in that: A light-shielding frame fixed on the first main surface and having at least two light-guiding holes penetrating along a first direction, and an LED light source is correspondingly arranged in each of the light-guiding holes, and the circuit board and the light-shielding frame are distributed along the first direction; The first main surface includes a display area, and the display area is the area of the first main surface exposed in the light-guiding holes; The circuit board is covered with a low-transparency layer for preventing the light of the LED light source from penetrating; The display area includes a welding area and an insulating area, a metal electrode is provided in the welding area, and the LED light source is connected to the metal electrode; The low-transparency layer includes a light-shielding layer obtained by covering a light-shielding material on the first main surface, and the light-shielding material fully covers at least the insulating area in the display area.

2. The LED display module according to claim 1, characterized in that: The circuit board is provided with a hole extending from the first main surface in a direction opposite to the first direction; The hole is opened outside the range of the display area.

3. The LED display module according to claim 2, characterized in that: The circuit board includes at least two circuit layer boards distributed along the first direction; at least two circuit layer boards include a bottom layer board, a first layer board, and multiple circuit layer boards located between the bottom layer board and the first layer board, and the first layer board is located on the side of the at least two circuit layer boards closest to the light-shielding frame; the bottom layer board is located on the side of the at least two circuit layer boards away from the light-shielding frame; The hole is a via hole extending from the first main surface in a direction opposite to the first direction to any one of the circuit layer boards, and the via hole is used to connect the conductors of different circuit layer boards; Or, The hole is a through hole penetrating the circuit board in a direction opposite to the first direction, and the devices on the circuit board pass through the through hole and are fixedly connected to the circuit board.

4. The LED display module according to claim 1, characterized in that: The circuit board includes at least two circuit layer boards, at least two circuit layer boards include a second layer board and a third layer board, the third layer board and the second layer board are distributed along the first direction, and the second layer board is located on the side of the at least two circuit layer boards closest to the light-shielding frame; The low-transparency layer further includes a ground wire layer obtained by covering a copper foil on the side of the circuit board away from the light-shielding frame, and the copper foil fully covers at least the light-blocking area of the third layer board, and the light-blocking area corresponds to the area jointly formed by the display area of the first main surface and the area where the light-shielding frame is installed.

5. The LED display module according to any one of claims 1 to 4, characterized in that: The light-shielding layer has a multi-layer structure and includes at least two light-shielding materials coated on the first main surface in sequence; among them, the light-shielding material coated on the first main surface first is black; after the light-shielding materials are coated, the light-shielding material closest to the light-shielding frame is used to reflect the light of the LED light source; The LED light source is an LED lamp bead, and the LED lamp bead is connected to the metal electrode on the circuit board through a metal pin; alternatively, the LED light source is an LED chip, and the LED chip is connected to the metal electrode on the circuit board through a metal wire; The light-shielding frame is in close fit with the first main surface; The circuit board is the main control board of the electronic product.

6. The LED display module according to claim 5, wherein: The light-shielding material is ink, and the light-shielding layer includes black ink and white ink screen-printed on the first main surface in sequence, wherein the ink screen-printed on the first main surface first is black; Based on the black ink and the white ink screen-printed on the first main surface in sequence, the thickness of the light-shielding layer is greater than 5 microns and less than 20 microns; or, the thickness of the light-shielding layer is equal to 5 microns; or, the thickness of the light-shielding layer is equal to 20 microns.

7. An LED display module for an electronic product, comprising: A circuit board having a first main surface; At least two LED light sources fixed on the first main surface; Characterized in that: A light-shielding frame fixed on the first main surface and having at least two light-guiding holes penetrating along a first direction, and an LED light source is correspondingly provided in each of the light-guiding holes, and the circuit board and the light-shielding frame are distributed along the first direction; The first main surface includes a display area, and the display area is the area of the first main surface exposed in the light-guiding holes; The circuit board is covered with a low-light-transmission layer, and the low-light-transmission layer is used to prevent the light of the LED light source from penetrating; The circuit board includes at least two circuit layer boards, and at least two circuit layer boards include a first layer board and a second layer board, the second layer board and the first layer board are distributed along the first direction, and the first layer board is located on the side closest to the light-shielding frame among at least two circuit layer boards; The low-light-transmission layer further includes a ground wire layer obtained by covering a copper foil on the side of the circuit board away from the light-shielding frame, and the copper foil completely covers at least the light-blocking area of the second layer board, and the light-blocking area corresponds to the area jointly formed by the display area of the first main surface and the area where the light-shielding frame is installed.

8. The LED display module according to claim 7, wherein: The circuit board is provided with a hole, and the hole extends from the first main surface in a direction opposite to the first direction; The hole is provided outside the range of the light-blocking area of the circuit board.

9. The LED display module according to claim 8, wherein: At least two circuit layer boards further include a bottom layer board and multiple circuit layer boards located between the first layer board and the bottom layer board; the bottom layer board is located on the side of at least two circuit layer boards away from the light-shielding frame; The via is a via hole that extends from the first main surface in a direction opposite to the first direction to any layer in the circuit board laminate, and the via hole is used to connect conductors of different circuit board laminates; Or, The via is a through hole that penetrates the circuit board in a direction opposite to the first direction. After a device on the circuit board passes through the through hole, it is fixedly connected to the circuit board.

10. An electronic product, including a display housing, characterized in that: It further includes the LED display module according to any one of claims 1-6, or includes the LED display module according to any one of claims 7-9, and the LED display module is fixedly arranged inside the display housing.

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