CN220474254U - Isotropic LED module - Google Patents

Abstract

The utility model discloses an isotropic LED module, which comprises a PCB, a light emitting chip and a lampshade assembly. The upper surface of the PCB is distributed with a plurality of LED luminous areas, and each LED luminous area is internally provided with a plurality of luminous chips. A layer of light-transmitting colloid is arranged above the PCB, and a plurality of downward concave refraction cambered surfaces are formed at the top of the light-transmitting colloid. The lamp shade assembly covers the top at the printing opacity colloid, and lamp shade assembly has a plurality of lamp shades, and every lamp shade corresponds a refraction cambered surface respectively. The lampshade is provided with a convex light-expanding part, the light-expanding part extends towards the direction away from the corresponding refraction cambered surface, the light-expanding part comprises a first cambered surface and a second cambered surface, and a refraction cavity is formed between the first cambered surface and the corresponding refraction cambered surface. The module forms a single lamp bead after being cut, and the lampshade changes the original point light source of the lamp bead into a surface light source, so that the light-emitting angle is effectively enlarged. Therefore, when the lamp beads are watched from all directions, the luminous color can keep the original tone, and the color temperature deviation can not be generated.

Description

Isotropic LED module

Technical Field

The utility model belongs to the technical field of LED display, and particularly relates to an isotropic LED module.

Background

The LED display system is widely used in the field of virtual photography. In a virtual studio, the requirements for shooting effect are high, and besides meeting conventional indexes, the requirements for higher specifications such as frame rate, color and the like are also required to be paid attention to. However, in the prior art, when a plurality of LED display screens are shot, the images are shot from different angles under the same image, and the image color display of the plurality of display screens has differences, so that the reality of the environment simulation is affected. The problem of color temperature shift at wide angles is closely related to the internal design of the display screen, i.e. to the design of the lamp beads. When the eyes look at the lamp beads, the correct color presented by the lamp beads can be observed; if the angle of the lamp beads observed by the eyes is gradually reduced and approaches to the horizontal, a vision blind area or dead angle exists, and the observed color is deviated. The color deviation is caused by the fact that the light emitted by one or two luminous lampwicks is blocked, and the human eyes do not completely observe the light of three colors. This is true for a single bead, as is the entire display screen. The lamp beads manufactured by the traditional technology are difficult to fundamentally solve the problem.

Disclosure of Invention

The utility model aims to solve the technical problems that: the isotropic LED module solves the problem that in the prior art, the color of the lamp beads in the screen is deviated when the lamp beads are watched from different directions in the direct display process.

In order to solve the technical problems, the technical scheme adopted by the utility model is to provide an isotropic LED module which comprises a PCB, a light-emitting chip and a lampshade assembly; a plurality of LED light-emitting areas are distributed on the upper surface of the PCB, a plurality of light-emitting chips are arranged in each LED light-emitting area, and the light-emitting chips are electrically connected with the PCB; a layer of light-transmitting colloid is arranged above the PCB, the light-transmitting colloid covers the light-emitting chip, a plurality of downward sunken refraction cambered surfaces are formed at the top of the light-transmitting colloid, and the refraction cambered surfaces are smooth cambered surfaces; the lampshade assembly is covered above the light-transmitting colloid, and is provided with a plurality of lampshades, each lampshade corresponds to one refraction cambered surface and covers the corresponding refraction cambered surface; the lampshade is provided with a convex light expansion part, the light expansion part extends towards the direction away from the corresponding refraction cambered surface, the light expansion part comprises a first cambered surface and a second cambered surface, and a refraction cavity is formed between the first cambered surface and the corresponding refraction cambered surface.

In some embodiments, a plurality of lampshades in the lampshades group are arranged in a matrix, and a plurality of refractive cambered surfaces at the top of the light-transmitting colloid are distributed in a matrix.

In some embodiments, the bottom surface of the light emitting chip is fixed on the upper surface of the PCB board through conductive adhesive, and a wire is connected between the light emitting chip and the upper surface of the PCB board.

In some embodiments, the light emitting chips in each light emitting area of the LEDs share an anode, the conductive colloid connects the light emitting chips and the anode of the PCB, and the wire connects the light emitting chips and the cathode of the PCB.

In some embodiments, the light emitting chips in each light emitting area of the LEDs share a cathode, the conductive colloid connects the light emitting chips and the cathode of the PCB, and the wire connects the light emitting chips and the anode of the PCB.

In some embodiments, the cross-sectional dimension of the light expansion portion gradually decreases in a direction away from the corresponding refractive camber.

In some embodiments, a horizontal plane where the first cambered surface and the corresponding refractive cambered surface are in contact is a reference plane.

In some embodiments, a perpendicular distance from a vertex of the first arc to the reference plane is equal to a perpendicular distance from a vertex of the arc of the refractive arc to the reference plane; or the vertical distance from the cambered surface top of the first cambered surface to the reference plane is smaller than the vertical distance from the cambered surface top of the refraction cambered surface to the reference plane; or, the vertical distance from the cambered surface top of the first cambered surface to the reference plane is greater than the vertical distance from the cambered surface top of the refraction cambered surface to the reference plane.

In some embodiments, the lampshade is made of transparent materials, and the lampshade is made of epoxy resin.

In some embodiments, three light emitting chips, that is, a red light chip, a green light chip and a blue light chip, are disposed in each light emitting area of the LED, and the red light chip, the green light chip and the blue light chip are linearly arranged.

The beneficial effects of the utility model are as follows: the utility model discloses an isotropic LED module, which comprises a PCB, a light emitting chip and a lampshade assembly. The upper surface of the PCB is provided with a plurality of LED luminous areas, a plurality of luminous chips are arranged in each LED luminous area, and the luminous chips are electrically connected with the PCB. A layer of light-transmitting colloid is arranged above the PCB and covers the light-emitting chip, and a plurality of downward sunken refraction cambered surfaces are formed at the top of the light-transmitting colloid and are smooth cambered surfaces. The lamp shade assembly covers the top at the printing opacity colloid, and lamp shade assembly has a plurality of lamp shades, and every lamp shade corresponds a refraction cambered surface respectively to the cover is established in the refraction cambered surface top that corresponds. The lampshade is provided with a convex light-expanding part, the light-expanding part extends towards the direction away from the corresponding refraction cambered surface, the light-expanding part comprises a first cambered surface and a second cambered surface, and a refraction cavity is formed between the first cambered surface and the corresponding refraction cambered surface. The module forms a single lamp bead after being cut, the lampshade changes the original point light source of the lamp bead into a surface light source, and the light-emitting angle is effectively enlarged under the conditions that the light-emitting brightness is not affected and the size of the light-emitting chip is not changed. So that the light color can maintain the original color tone and no color temperature deviation is generated when the lamp beads are watched from all directions.

Drawings

FIG. 1 is a schematic diagram of an isotropic LED module according to the present utility model;

FIG. 2 is a partial left side cross-sectional view of an isotropic LED module of the present utility model;

FIG. 3 is an enlarged block diagram of a left-hand cross-sectional view at A in FIG. 1;

FIG. 4 is an enlarged block diagram of the top view at A in FIG. 1;

figure 5 is a structural cross-sectional view of another embodiment of the globe of figure 3;

figure 6 is a cross-sectional view of another embodiment of the globe of figure 3;

FIG. 7 is a schematic view of a structure according to FIG. 3;

FIG. 8 is a perspective view of an LED display system according to the present utility model;

fig. 9 is a front view of a prior art cinema screen.

Detailed Description

In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

Fig. 1 is a schematic structural diagram of an isotropic LED module (not shown in the lampshade assembly 3), and in combination with fig. 2, the isotropic LED module includes a PCB board 1, a light emitting chip 2 and the lampshade assembly 3.

The upper surface of the PCB 1 is provided with a plurality of LED luminous areas 11, a plurality of luminous chips 2 are arranged in each LED luminous area 11, and the luminous chips 2 are electrically connected with the PCB 1. A layer of light-transmitting colloid 4 is arranged above the PCB 1, and the light-transmitting colloid 4 covers the light-emitting chip 2, namely, the upper surface of the light-transmitting colloid 4 is higher than the upper surface of the light-emitting chip 2 in the height direction; the top of the light-transmitting colloid 4 is provided with a plurality of downward concave refraction cambered surfaces 41, and the refraction cambered surfaces 41 are smooth cambered surfaces.

The lampshade assembly 3 is covered above the light-transmitting colloid 4, the lampshade assembly 3 is provided with a plurality of lampshades 31, each lampshade 31 corresponds to one refraction cambered surface 41 respectively, and the lampshade is covered above the corresponding refraction cambered surface 41. The lamp housing 31 has a protruding light-spreading portion 311, the light-spreading portion 311 extends in a direction away from the corresponding refractive cambered surface 41, the light-spreading portion 311 includes a first cambered surface 3111 and a second cambered surface 3112, and a refractive cavity 5 is formed between the first cambered surface 3111 and the corresponding refractive cambered surface 41.

In this embodiment, as shown in fig. 3 and 4, three light emitting chips 2 are disposed in each LED light emitting area 11, and are respectively a red light chip, a green light chip and a blue light chip, which are linearly arranged. Of course, other arrangements of the three light emitting chips 2 are possible, for example in a delta-shaped arrangement, and the remaining arrangements are not shown in the figures.

After the isotropic LED module of the present utility model is manufactured, it may be divided and cut according to the single LED light emitting area 11 to form a single lamp bead as shown in fig. 3.

In this embodiment, in each lamp bead, the lampshade 31 is covered above the refractive cambered surface 41 corresponding to the light-transmitting colloid 4, and the two are combined to form an air cavity, namely the refractive cavity 5. In the refraction cavity 5, the light source of the light emitting chip 2 can be changed from a point light source to a surface light source due to refraction of light. Therefore, when the formed single lamp bead is displayed, due to the change of the light path, the light emitting angle is increased, the light emitting color of the lamp bead is kept in the original color tone when the lamp bead is watched from different directions, color temperature deviation can not be generated, and the problem of color temperature drift when different scenes are watched is effectively solved.

Further, as shown in fig. 1 and 2, a plurality of LED light emitting areas 11 are distributed on the upper surface of the PCB board 1, and the plurality of LED light emitting areas 11 are arranged in a matrix. Correspondingly, the light-transmitting colloid 4 above the PCB board 1 has a plurality of refractive cambered surfaces 41 at the top thereof distributed in a matrix. Accordingly, the plurality of lamp covers 31 corresponding to the plurality of refractive cambered surfaces 41 are also arranged in a matrix. The matrix arrangement mode is compact in structure, space of the PCB 1 is fully utilized, and attractiveness of layout is maintained.

In the present embodiment, the light emitting chip 2 is electrically connected with the PCB board 1. As shown in fig. 3, the bottom surface of the light emitting chip 2 is fixed on the upper surface of the PCB board 1 by the conductive adhesive 6, and meanwhile, a wire 7 is connected between the light emitting chip 2 and the upper surface of the PCB board 1. After the three light emitting chips 2 in each LED light emitting area 11 are electrically connected with the PCB board 1, corresponding pins (not shown) are formed on the back surface of the PCB board 1, i.e. corresponding pins are provided on the back of each lamp bead. When in use, the single lamp bead can be arranged at a required place through the pin.

In this embodiment, the conductive paste 6 is silver paste. The silver colloid mainly plays roles of adhesion and conductivity. The wire 7 may be a gold wire, a silver wire, a copper wire, or an alloy wire. In this embodiment, gold wires are preferable, and the gold wires have stable performance and can prevent oxidation, so that the contact stability between the PCB board 1 and the light emitting chip 2 can be ensured.

In some embodiments, the light emitting chips 2 in each LED light emitting region 11 share an anode, the conductive gel 6 connects the anodes of the three light emitting chips 2 and the anode of the PCB board 1, and the conductive wires 7 connect the cathodes of the three light emitting chips 2 and the cathode of the PCB board 1, respectively.

In some embodiments, the light emitting chips 2 in each LED light emitting region 11 share a cathode, the conductive gel 6 connects the three light emitting chips 2 and the cathode of the PCB board 1, and the conductive wires 7 connect the three light emitting chips 2 and the anode of the PCB board 1, respectively.

Further, the transparent colloid 4 is made of epoxy resin. The main function of the epoxy resin is to protect the internal structure of the module and shape the module, and at the same time, the epoxy resin can slightly change the light-emitting color, the light-emitting brightness and the light-emitting angle of the light-emitting chip 2. The transparent colloid 4 is arranged above the PCB 1 and covers all the light emitting chips 2, and the edge contour of the transparent colloid 4 is flush with the edge of the PCB 1. The transparent colloid 4 is in a fluid state before solidification, the transparent colloid 4 is molded through a specific die, a plurality of required refraction cambered surfaces 41 can be obtained after solidification, and the degree of downward sinking of the refraction cambered surfaces 41 can be adjusted according to different dies.

In this embodiment, the lampshade 31 is made of transparent material, and the lampshade 31 is made of epoxy resin. The transparent globe 31 does not affect the light emission color of the light emitting chip 2. The epoxy resin functions as an optical lens, and the light-emitting angle of the light-emitting chip 2 can be controlled by forming the epoxy resin into the lamp housing 31. The epoxy resin can also improve the light extraction efficiency and reduce the total reflection of light. The material of the lamp housing 31 is epoxy resin, and thus is in a fluid state before curing. The canopy assembly 3 is set in a fluid state using a specific mold, and a plurality of desired canopy 31 can be formed after curing.

Further, as shown in fig. 2 to 3, the lamp housing 31 has a protruding light-spreading portion 311, the light-spreading portion 311 extends in a direction away from the corresponding refractive cambered surface 41, the light-spreading portion 311 includes a first cambered surface 3111 and a second cambered surface 3112, and a cavity is formed between the refractive cambered surface 41 formed by a specific mold and the first cambered surface 3111 of the light-spreading portion 311, and is the refractive cavity 5.

Due to the refraction of the light, the three light emitting chips 2 are emitted to the refraction cavity 5 after light mixing. In the refraction cavity 5, the light path is changed by air re-refraction, the light emitting angle is increased, and the light source is changed from a point light source to a surface light source, so that the light emitting color does not deviate when the light emitting device is viewed from all directions.

In the present embodiment, the cross-sectional dimension of the light expanding portion 311 gradually decreases in a direction away from the corresponding refractive cambered surface 41. The portion of the light-expanding portion 311 farthest from the corresponding refractive cambered surface 41 has the smallest cross-sectional area.

Further, the horizontal plane at which the first arc surface 3111 and the corresponding refractive arc surface 41 are in contact is the reference plane 51.

In the present embodiment, as shown in fig. 3, the vertical distance L1 of the arc surface vertex of the first arc surface 3111 to the reference plane 51 is equal to the vertical distance L2 of the arc surface vertex of the refractive arc surface 41 to the reference plane 51, that is, l1=l2. In this case, the light emitted from the light emitting chip 2 may form a light emitting angle.

As shown in fig. 5, in some embodiments, the perpendicular distance L1 of the arc apex of the first arc 3111 to the reference plane 51 is smaller than the perpendicular distance L2 of the arc apex of the refractive arc 41 to the reference plane 51, i.e., L1< L2. In this case, the light emitted from the light emitting chip 2 may form another light emitting angle.

As shown in fig. 6, in some embodiments, the perpendicular distance L1 of the arc apex of the first arc 3111 to the reference plane 51 is greater than the perpendicular distance L2 of the arc apex of the refractive arc 41 to the reference plane 51, i.e., L1> L2. In this case, the light emitted from the light emitting chip 2 may form a third light emitting angle again.

The change of the arc of the lamp shade 31 corresponds to the change of the light emitting angle of the light emitting chip 2. The three cases described above also represent three different light emission angles. It should be noted that the above three variations are merely examples of the present utility model, and other variations of the lamp housing 31 may be calculated according to the following formulas according to the use requirements.

As shown in fig. 7, according to the geometrical optics theory, the structural parameters of the lamp shade 31: the following relation is satisfied among the contact angle theta, the focal length f, the outer diameter D, the curvature radius R and the crown height H:

in n ₀ Refractive index of air, n ₁ The outer diameter D is here equal to the side length of the individual LED light-emitting region 11, which is the refractive index of the lamp shade 31.

And the bottom edge dimension of the refraction cavity 5 is d, h is the height of the refraction cavity 5, and the three parts are as follows:

simultaneous availability:

the structure of lamp shade 31 can be determined by the above parameter calculation.

As shown in fig. 1 to 3, after the isotropic LED module of the present utility model is manufactured, it is divided and cut according to the single LED light emitting area 11 to form a single lamp bead as shown in fig. 3. When the formed single lamp bead is displayed, the luminous color can keep the original tone without color temperature deviation when being watched from different directions.

As shown in fig. 8, an LED display system 9 includes a plurality of LED display screens, on which the above-mentioned lamp beads formed by cutting the isotropic LED modules are mounted.

The number of LED display screens is three in the figure, including a left screen 91, a right screen 92 and a ground screen 93. The three display screens are spliced together to form the LED display system 9, thereby making a simple studio. When shooting in a film studio, the requirements on shooting effect are high, and besides meeting the conventional index, the requirements on higher specifications such as frame rate, color and the like are also required to be paid attention to. The lamp beads formed after the isotropic LED module is cut can meet the requirements. When the lamp bead provided by the utility model is used for shooting a plurality of LED display screens, the LED display screens are shot from different directions under the same picture, and the picture colors of the plurality of display screens are consistent, so that the sense of reality of environmental simulation can be improved.

As shown in fig. 9, a cinema screen 10 is known in the art. In the field of movie display, there is a fixed requirement for resolution, so when an LED display screen is placed in a movie screen, the number of LED light beads is also fixed. With the change of the size of the screen, the distance between the lamp beads also changes, and due to the limited light emitting area of the lamp beads, when the distance between the lamp beads is too large, a dark area 101 as shown in the figure is generated, and when the screen is watched by eyes, the screen appears as black lines, namely mole patterns. This results in poor viewing effect. The lamp bead formed by cutting the isotropic LED module can just solve the problem. It is mounted in an LED display screen which is built into the movie screen 10. At this time, the light beads in the movie screen 10 are improved, and the light emitting area is effectively enlarged, so that the dark area 101 is reduced, that is, the moire is eliminated, thereby effectively improving the viewing effect.

Therefore, the utility model discloses an isotropic LED module which comprises a PCB, a light emitting chip and a lampshade assembly. The upper surface of the PCB is provided with a plurality of LED luminous areas, a plurality of luminous chips are arranged in each LED luminous area, and the luminous chips are electrically connected with the PCB. A layer of light-transmitting colloid is arranged above the PCB and covers the light-emitting chip, and a plurality of downward sunken refraction cambered surfaces are formed at the top of the light-transmitting colloid and are smooth cambered surfaces. The lamp shade assembly covers the top at the printing opacity colloid, and lamp shade assembly has a plurality of lamp shades, and every lamp shade corresponds a refraction cambered surface respectively to the cover is established in the refraction cambered surface top that corresponds. The lampshade is provided with a convex light-expanding part, the light-expanding part extends towards the direction away from the corresponding refraction cambered surface, the light-expanding part comprises a first cambered surface and a second cambered surface, and a refraction cavity is formed between the first cambered surface and the corresponding refraction cambered surface. The module forms a single lamp bead after being cut, the lampshade changes the original point light source of the lamp bead into a surface light source, and the light-emitting angle is effectively enlarged under the conditions that the light-emitting brightness is not affected and the size of the light-emitting chip is not changed. So that the light color can maintain the original color tone and no color temperature deviation is generated when the lamp beads are watched from all directions.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the present utility model and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.

Claims (10)

1. The isotropic LED module is characterized by comprising a PCB, a light-emitting chip and a lampshade assembly;

a plurality of LED light-emitting areas are distributed on the upper surface of the PCB, a plurality of light-emitting chips are arranged in each LED light-emitting area, and the light-emitting chips are electrically connected with the PCB;

a layer of light-transmitting colloid is arranged above the PCB, the light-transmitting colloid covers the light-emitting chip, a plurality of downward sunken refraction cambered surfaces are formed at the top of the light-transmitting colloid, and the refraction cambered surfaces are smooth cambered surfaces;

the lampshade assembly is covered above the light-transmitting colloid, and is provided with a plurality of lampshades, each lampshade corresponds to one refraction cambered surface and covers the corresponding refraction cambered surface;

the lampshade is provided with a convex light expansion part, the light expansion part extends towards the direction away from the corresponding refraction cambered surface, the light expansion part comprises a first cambered surface and a second cambered surface, and a refraction cavity is formed between the first cambered surface and the corresponding refraction cambered surface.

2. The isotropic LED module of claim 1, wherein a plurality of lamp shades in the lamp shade group are arranged in a matrix, and a plurality of refractive cambered surfaces at the top of the light-transmitting colloid are distributed in a matrix.

3. The isotropic LED module according to claim 2, wherein the bottom surface of the light emitting chip is fixed on the upper surface of the PCB by conductive adhesive, and a wire is connected between the light emitting chip and the upper surface of the PCB.

4. An isotropic LED module according to claim 3 wherein the light emitting chips in each LED light emitting area share an anode, the conductive gel connects the light emitting chips to the anode of the PCB, and the conductive wire connects the light emitting chips to the cathode of the PCB.

5. An isotropic LED module according to claim 3 wherein the light emitting chips in each LED light emitting area share a cathode, the conductive gel connects the light emitting chips to the cathode of the PCB, and the conductive wire connects the light emitting chips to the anode of the PCB.

6. An isotropic LED module according to claim 4 or 5, wherein the cross-sectional dimension of the light spreading portion gradually decreases in a direction away from the corresponding refractive camber.

7. The isotropic LED module according to claim 6, wherein a horizontal plane where the first cambered surface and the corresponding refractive cambered surface are in contact is a reference plane.

8. The isotropic LED module of claim 7, wherein the vertical distance from the arc apex of the first arc to the reference plane is equal to the vertical distance from the arc apex of the refractive arc to the reference plane; or the vertical distance from the cambered surface top of the first cambered surface to the reference plane is smaller than the vertical distance from the cambered surface top of the refraction cambered surface to the reference plane; or, the vertical distance from the cambered surface top of the first cambered surface to the reference plane is greater than the vertical distance from the cambered surface top of the refraction cambered surface to the reference plane.

9. The isotropic LED module of claim 8, wherein the lamp housing is made of transparent material and the material of the lamp housing is epoxy.

10. The isotropic LED module of claim 9, wherein three light emitting chips, red light chips, green light chips and blue light chips, are disposed in each light emitting region of the LED, and the red light chips, the green light chips and the blue light chips are arranged linearly.