CN217133941U

CN217133941U - Light emitting unit and LED display screen

Info

Publication number: CN217133941U
Application number: CN202220346002.6U
Authority: CN
Inventors: 胡頔迪; 邳东林; 刘爱宁
Original assignee: Beijing Universal Lanbo Technology Co ltd
Current assignee: Beijing Universal Lanbo Technology Co ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2022-08-05
Anticipated expiration: 2032-02-21

Abstract

The utility model discloses a light-emitting unit and LED display screen, wherein, the light-emitting unit includes scattering cover, light source and circuit board, the light source with the scattering cover is arranged on the circuit board, the scattering cover cooperates with the circuit board to surround the light source; a first cavity is formed at the top of the scattering cover, and the light source is positioned below the first cavity; wherein the first cavity is constructed in a shape of being thin at the periphery and thick at the middle. According to the light-emitting unit, the first containing cavity is arranged, so that a manufacturer can conveniently add high-refractive-index light-transmitting substances or other light-transmitting substances into the first containing cavity directly to adjust the light-emitting effect of the light-emitting unit.

Description

Light emitting unit and LED display screen

Technical Field

The present disclosure relates to optical structure technology, and in particular, to a light emitting unit and an LED display screen.

Background

In the prior art, the illumination direction of the LED light emitting unit is controlled mainly by adjusting the shape of the cover body, for example, the cover body is set to be thick in the middle and thin at the periphery to form a light condensing effect. However, the shape of the cover body is not easy to adjust, so that once the light emitting effect of the LED light emitting unit is not ideal or customers are not satisfactory, the shape of the cover body is difficult to adjust rapidly in factories, and the construction period is delayed.

SUMMERY OF THE UTILITY MODEL

The light emitting unit and the LED display screen can conveniently adjust the illumination effect.

In a first aspect, the present disclosure provides a light emitting unit, including a scattering cover, a light source, and a circuit board, where the light source and the scattering cover are disposed on the circuit board, and the scattering cover and the circuit board cooperate to surround the light source; a first cavity is formed at the top of the scattering cover, and the light source is positioned below the first cavity; wherein the first cavity is constructed in a shape of being thin at the periphery and thick at the middle.

Optionally, the first cavity is in a shape of being arched upwards from the periphery to the middle, and the top surface of the first cavity is a spherical surface.

Optionally, the first cavity is filled with a high-refractive-index light-transmitting substance, wherein the refractive index of the high-refractive-index light-transmitting substance is greater than 1.2.

Optionally, the high refractive index light-transmitting substance in the first cavity is thin at the periphery and thick at the middle, so that the high refractive index light-transmitting substance in the first cavity forms a convex lens structure.

Optionally, the first cavity is filled with the high refractive index light-transmitting substance.

Optionally, the first cavity is a cavity.

Optionally, the top of the diffuser cover is an arc-shaped shell which is arched upwards.

Optionally, the haze of the scattering cover is greater than or equal to 50%, or the first cavity is filled with a light-transmitting substance with the haze greater than or equal to 50%.

In a second aspect, the present disclosure provides an LED display screen, which includes a plurality of light emitting units in any one of the above embodiments, wherein the light source is an LED chip or an LED lamp.

Optionally, a ratio of a thickness d1 of the top of the scattering cover to a center-to-center distance d2 of each light emitting unit is less than 0.3.

Has the advantages that: according to the light-emitting unit, the first containing cavity is arranged, so that a manufacturer can conveniently add high-refractive-index light-transmitting substances or other light-transmitting substances into the first containing cavity directly to adjust the light-emitting effect of the light-emitting unit. The first accommodating cavity is arranged to be thin at the periphery and thick in the middle, so that a manufacturer can directly add high-refractive-index light-transmitting substances into the first accommodating cavity during production, light emitted by the light source can be converged by the high-refractive-index light-transmitting substances, and the light emitted by the light-emitting unit is more concentrated.

Drawings

Fig. 1 is a schematic structural diagram of a light emitting unit in the prior art.

Fig. 2 is a schematic structural diagram of a light emitting unit in one embodiment of the present disclosure.

Fig. 3 is a schematic structural view of the light emitting unit shown in fig. 2 without the LED lamp.

Fig. 4 is a schematic structural diagram of the light emitting unit shown in fig. 2 at another angle.

Fig. 5 is a top view of the diffuser cap shown in fig. 2.

Fig. 6 is a bottom portion of the diffusion cover shown in fig. 2.

Fig. 7 is a schematic structural diagram of the LED lamp shown in fig. 2.

Fig. 8 is a schematic structural view of a plurality of light emitting units when they are spliced.

Fig. 9 is a schematic structural view of two light-emitting units when they are spliced.

Fig. 10 is a schematic structural diagram of a light emitting unit according to another embodiment.

The labels in the figure are: 1. a circuit board; 2. an LED lamp; 3. a scattering cover; 31. a first cavity; 32. a second cavity; 33. a top portion; 34. a bottom; 10. a light emitting unit; d1, thickness of top of diffuser cap; d2, spacing between light sources.

Detailed Description

It should be understood that the exemplary embodiments described herein should be considered in descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each exemplary embodiment should generally be considered as available for similar features or aspects in other exemplary embodiments.

As shown in fig. 1, in the diffuser housing 3 of the conventional lighting unit 10, the diffuser housing 3 is provided with a first cavity 31 for accommodating an LED lamp. However, the size of the first accommodating cavity 31 is the same as that of the LED lamp 2 or the first accommodating cavity 31 is slightly larger than the LED lamp 2, so that a light-transmitting material is not easily added between the first accommodating cavity 31 and the LED lamp 2 to adjust the light-emitting effect of the light-emitting unit 10. Accordingly, the present applicant has proposed a novel light emitting unit 10 in order to solve the problems of the prior art. As shown in fig. 2 to 4, the LED lamp assembly comprises a scattering cover 3, an LED lamp 2 and a circuit board 1, wherein the LED lamp 2 and the scattering cover 3 are disposed on the circuit board 1, and the scattering cover 3 and the circuit board 1 cooperate to surround the LED lamp 2; a first cavity 31 is formed at the top 33 of the diffusion cover 3, and the LED lamp 2 is located below the first cavity 31, wherein the first cavity 31 is configured to be thin at the periphery and thick at the middle. More specifically, the diffuser shell 3 comprises a top portion 33 and a bottom portion 34. As shown in fig. 5, the top 33 of the diffusion cover 3 is configured to form a first cavity 31. As shown in fig. 6, the bottom 34 of the diffusion cover 3 is configured to form a second cavity 32, and the first cavity 31 is located above the second cavity 32 and is communicated with the second cavity 32. The LED lamp 2 is located in the second cavity 32, and the scattering cover 3 has a first cavity 31 above the LED lamp 2 for accommodating other substances.

It should be understood that although the volume of the second cavity 32 is larger than the volume of the LED lamp 2 as shown in fig. 2, in some embodiments, the volume of the second cavity 32 may be adjusted such that the second cavity 32 is the same size as the LED lamp 2, or slightly larger than the LED lamp 2.

Since the LED lamp 2 is not abutted to the top 33 of the diffusion cover 3, and there is a vacancy in the first cavity 31, the user may not set any light-transmitting substance in the first cavity 31 or add a light-transmitting substance inside. Specifically, when no light-transmitting substance is disposed in the first cavity 31, that is, the first cavity 31 is a cavity, the emission of the bright light emitted from the LED lamp 2 is not changed according to the original route. However, if the direction of the bright light emitted from the LED lamp 2 is changed, a light-transmitting substance of a different material may be added. If the first cavity 31 is filled with the high-refractive-index light-transmitting material, a convex lens effect can be formed, so that light emitted by the LED lamp 2 is converged into a smaller angular range in front, and higher front brightness is obtained. Even the shape of the shell and the distance from the shell to the LED lamp can be adjusted according to needs, and convex lenses with different parameters are formed after the transparent material is filled, so that different light condensation effects are obtained. Through setting up first appearance chamber 31 for the producer can fill the printing opacity material of different materials in first appearance chamber 31 so as to form different luminous effects according to the condition. More specifically, a manufacturer can directly manufacture a batch of LED lamps 2, PCB boards and diffusion covers 3 with the same specification, and then adjust the light-transmitting substance filled therein according to the situation during assembly, which is beneficial for the manufacturer to manufacture various types of light-emitting units 10.

Specifically, the top 33 of the diffuser 3 is an arc-shaped shell which is arched upwards, so that the first cavity 31 is also arched upwards from the periphery to the middle, and the top surface of the first cavity 31 is a spherical surface, except that the first cavity 31 is thin at the periphery and thick at the middle. It should be understood that the top 33 of the scattering cover 3 may be in other shapes besides the arc-shaped shell which is arched upwards, and in particular, as shown in fig. 10, as long as the top 33 of the scattering cover 3 can make the first cavity 31 form a shape which is thick in the middle and thin at the periphery. Meanwhile, it should be understood that the first cavity 31 is arched upward from the periphery to the middle, and the top surface of the first cavity 31 is a spherical surface, which is only one alternative, and the first cavity 31 may also have other structures, which is beneficial to the high refractive index light-transmitting substance filled in the first cavity 31 to form a convex lens structure. A manufacturer can directly add a high-refractive-index light-transmitting substance into the first cavity 31 so that the high-refractive-index light-transmitting substance in the first cavity 31 is thin at the periphery and thick in the middle to form a convex lens structure, thereby enhancing the light-gathering effect. The specific production mode can be as follows: after a manufacturer adds a high-refractive-index light-transmitting substance into the top 33 of the scattering cover 3 and fills the first cavity 31, the high-refractive-index light-transmitting substance in the first cavity 31 can be in a shape with thin periphery and thick middle. The top 33 of the diffusion hood 3 is then spliced with the bottom 34 of the diffusion hood 3 to form the complete diffusion hood 3.

It is understood that a high index of refraction light transmissive substance means that the substance has an index of refraction greater than 1.2 and that light can pass through the substance.

Optionally, the top 33 of the diffuser 3 is an upwardly arched arc-shaped shell. Specifically, the case means that the thickness of the top 33 of the diffusion cover 3 is relatively thin. More specifically, the ratio of the thickness d1 of the top of the diffuser cap to the center-to-center distance d2 of each light emitting cell is less than 0.3, i.e., the ratio

It should be understood that the center-to-center distance d2 of each light emitting cell is the distance between the centers of each light emitting cell.

Further, the shape of the bottom 34 of the diffusion cover 3 may be various. The shape is not necessarily square as shown in fig. 2 and 6, but may be an arc-shaped housing, and is not limited to the shape shown in fig. 2.

It will be appreciated that one of the functions of the diffuser shell 3 is: when the LED lamp 2 emits light, the light is scattered after passing through the scattering cover 3 so that the top 33 of the whole scattering cover 3 emits light together, thereby forming a light emitting region of the light emitting unit 10. That is, the light emitting area of the light emitting unit 10 is enlarged and is not limited to the area corresponding to the LED lamp 2. Optionally, the haze of the scattering cover 3 is greater than or equal to 50%, which is more beneficial to scattering light to spread the whole scattering cover 3, and in some embodiments, the first cavity may be filled with a transparent substance with haze, and more specifically, the first cavity is filled with a transparent substance with high refractive index with haze greater than or equal to 50%. Also optionally, the material of the scattering cover 3 may be one or more of epoxy resin, silica gel, and polycarbonate.

Since the outer contour of the scattering cover 3 is equivalent to the light-emitting area of the light-emitting unit 10, and in order to avoid a relatively obvious gap existing in the light-emitting area of the LED display screen formed by assembling a plurality of light-emitting units 10, the outer contour of the scattering cover 3 is matched with the outer contour of the circuit board 1, and the light-emitting areas of the LED display screen are further distributed more closely. Of course, in some other embodiments, the outer contour of the circuit board 1 may be larger than the outer contour of the scattering cover 3.

In some embodiments, the LED display screen includes a plurality of the above-described light emitting units 10 as shown in fig. 8. It is to be understood that instead of using an LED lamp 2 as shown in fig. 7, another light source, such as an LED chip, may be used. It should be understood that the LED lamp 2 and/or the LED chip should be soldered to the circuit board 1. Also, it should be understood that each light-emitting unit may include a plurality of light sources, such as a plurality of LED chips, the present disclosure is not limited to the number of light sources, and the height (or size) of the second cavity 32 may be adaptively adjusted according to the size of the light sources in the light-emitting unit.

It will be understood that each light-emitting unit 10 is a pixel of the LED screen it forms; the LED screen is formed by arranging a plurality of such light emitting units on a PCB board.

Although as shown in fig. 2, one diffusion case 3 corresponds to one circuit board 1 and one LED lamp 2. However, in some embodiments, one diffuser cover 3 may include a plurality of top portions 33 of the arc-shaped housing which are arched upwards to form a plurality of first cavities 31 which correspond to the top portions 33 one by one, and the diffuser cover 3 includes a plurality of second cavities 32 which correspond to the first cavities 31 one by one, and each of the second cavities 32 may accommodate one or more LED lamps 2 as the case may be.

Since in some embodiments the scattering cover 3 is made of a material with a certain haze. The light emitted from the diffusion cover 3 is diffused in various directions, so that the light emitted from the top of the diffusion cover 3 is diffused, and the light source seen by naked eyes is the diffusion cover 3 with the whole light emitted, so that the point light source of the LED lamp 2 is expanded to the whole diffusion cover 3 (specifically, the top surface of the top of the diffusion cover 3) to form a surface light source. When the LED display screen cover is seen from the outside, the whole LED display screen cover is bright, the shape of the LED lamp 2 cannot be seen, the dazzling feeling of the LED screen can be reduced, and the displayed image is softer.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A light-emitting unit is characterized by comprising a scattering cover, a light source and a circuit board, wherein the light source and the scattering cover are arranged on the circuit board, and the scattering cover and the circuit board are matched to surround the light source; a first cavity is formed at the top of the scattering cover, and the light source is positioned below the first cavity; wherein, the first cavity is constructed into a shape with thin periphery and thick middle.

2. The lighting unit of claim 1, wherein the first cavity is upwardly arched from the periphery to the center, and the top surface of the first cavity is spherical.

3. The lighting unit according to claim 1, wherein the first cavity is filled with a high refractive index light transmissive substance, wherein the refractive index of the high refractive index light transmissive substance is greater than 1.2.

4. The lighting unit of claim 3, wherein the high refractive index light transmissive substance in the first cavity is thin at the periphery and thick at the middle, such that the high refractive index light transmissive substance in the first cavity forms a convex lens structure.

5. The lighting unit of claim 4, wherein the first cavity is filled with the high refractive index light transmissive substance.

6. The lighting unit according to claim 1, wherein the first cavity is a cavity.

7. The lighting unit of claim 1, wherein the top of the diffuser cap is an upwardly arched arc-shaped housing.

8. The lighting unit according to claim 1, wherein the haze of the scattering cover is 50% or more, or the first cavity is filled with a light-transmitting substance with a haze of 50% or more.

9. An LED display screen, comprising a plurality of light emitting units according to any one of claims 1 to 8, wherein the light source is an LED chip or an LED lamp.

10. The LED display screen of claim 9, wherein the ratio of the thickness d1 of the top of the diffuser cap to the center-to-center distance d2 of each light emitting unit is less than 0.3.