CN215376012U

CN215376012U - Backlight module

Info

Publication number: CN215376012U
Application number: CN202023352167.4U
Authority: CN
Inventors: 沈兴纲; 谢超英; 苏凤宜; 侯宇
Original assignee: Lianjing Intelligent Electronics Co ltd
Current assignee: Lianjing Intelligent Electronics Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-12-31
Anticipated expiration: 2030-12-31

Abstract

The utility model discloses a backlight module, which comprises a backlight lens, a light source, reflecting paper and a diffusion plate, wherein the light source is arranged on the backlight lens; the backlight lens comprises a lens main body, a mounting groove formed in the center of the lens main body and a reflective coating coated on the bottom surface of the lens; the lens main body is of a central symmetrical structure; the light source sets up in the mounting groove, reflection paper covers in the notch department of mounting groove, reflection paper and reflection coating constitute the diffuse reflection passageway, the top surface setting of diffuser plate laminating lens main part, the light that the light source sent carries out the refraction outdiffusion through lens main part and diffuser plate again after the diffuse reflection by the diffuse reflection passageway. And arranging the light source in the mounting groove to reduce the height of the OD. The OD height is further reduced by removing the support posts that match the diffuser plate. Especially, the light emitted by the light source is processed through the diffuse reflection channel formed by the reflection paper and the reflection coating, so that the light is more uniform after being refracted by the diffusion plate, the shadow defect is made up, and the picture quality is improved.

Description

Backlight module

Technical Field

The utility model belongs to the technical field of backlight display, and particularly relates to a backlight module.

Background

With the progress of technology, lcd tvs are also being developed to be thinner. In the conventional lcd tv, a direct type LED backlight strip is generally used as a backlight source of a liquid crystal panel, and the direct type backlight strip is formed by laminating a PCB (printed circuit board), LED light sources, lenses, and a diffuser plate from bottom to top. The thickness of a traditional lens is generally between 5 and 8mm, a diffusion plate is matched with a support column, the laminated structure limits the OD height (Optical Distance, Distance from a light source to the diffusion plate) to be between 10 and 35mm, and the existence of the support column can block part of light to generate dark shadow, thereby affecting the picture quality of the liquid crystal television.

Therefore, need to research and develop novel backlight lamp strip structure urgently, break through the bottleneck of restriction OD height, further reduce LCD TV's thickness and promote picture quality, promote product market competition.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a backlight module, which combines diffuse reflection and refraction effects to ensure that light rays emitted by the backlight module are uniform and have no shadow and increase the light-emitting angle. The OD height can be further reduced.

The utility model is realized by the following technical scheme:

a backlight module comprises a backlight lens, a light source, a reflecting paper and a diffusion plate; the backlight lens comprises a lens main body, a mounting groove formed in the center of the lens main body and a reflective coating coated on the bottom surface of the lens; the lens main body is of a central symmetrical structure, the inner cavity of the mounting groove is cylindrical, and the bottom surface of the lens main body is provided with a foot post; the light source sets up in the mounting groove, reflection paper covers in the notch department of mounting groove, reflection paper and reflection coating constitute the diffuse reflection passageway, the top surface setting of diffuser plate laminating lens main part, the light that the light source sent carries out the refraction outdiffusion through lens main part and diffuser plate again after the diffuse reflection by the diffuse reflection passageway.

Through the scheme, the utility model at least obtains the following technical effects:

according to the backlight module provided by the utility model, the light source is arranged in the mounting groove formed in the lens main body, and the diffusion plate is directly attached to the top surface of the lens main body, so that the thickness of independently arranging the light source is reduced, the thickness of matching the support column for the diffusion plate is eliminated, and the OD height is greatly reduced.

The mounting groove is covered with reflective paper at the notch of the top surface of the lens main body, and the reflective paper and the reflective coating on the bottom surface of the lens main body are opposite to form a diffuse reflection channel. The light source is used as a central point to diffuse and output parallel light rays outwards, and one part of the parallel light rays passes through the side wall of the mounting groove and the lens main body and is refracted and output by the diffusion plate; the other part of the light passes through the lens main body after being subjected to multiple diffuse reflection of the reflection paper or the reflection coating and is refracted and output through the diffusion plate, so that the defect that the light rays from the light source directly to the diffusion plate cannot be irradiated or are not uniform enough can be overcome, the shadow is eliminated, and the picture quality is improved.

Preferably, the reflecting paper is circular, and the center of the reflecting paper is located on the central line of the lens main body.

Preferably, the diameter of the reflection paper is larger than that of the installation groove.

Preferably, the diffusion plate has a centrosymmetric structure, and the central line of the diffusion plate coincides with the central line of the lens body.

Preferably, the surface of the diffusion plate is provided with a plurality of layers of annular convex edges which are concentrically arranged, and the centers of the annular convex edges are all located on the central line of the lens main body.

Preferably, the cross section of any annular convex rib is a closed semicircle, wherein the surface of the cut line of the closed semicircle is attached to the top surface of the lens body.

The utility model has the beneficial effects that:

a mounting groove is formed in the backlight lens, and the light source is arranged in the mounting groove to reduce the OD height. And then, directly attaching the diffusion plate to the top surface of the backlight lens, removing the supporting columns matched with the diffusion plate, and further reducing the OD height. Especially, the light emitted by the light source is processed through the diffuse reflection channel formed by the reflection paper and the reflection coating, so that the light is more uniform after being refracted by the diffusion plate, the shadow defect is made up, and the picture quality is improved. And the light rays diffusely reflected by the reflecting paper or the reflecting coating have larger light-emitting angle, so that the irradiation range of the backlight module can be enlarged.

Drawings

Fig. 1 is a schematic cross-sectional view of a backlight lens according to an embodiment of the utility model.

Fig. 2 is a schematic cross-sectional view of a backlight module according to an embodiment of the utility model.

Fig. 3 is a schematic top view of the backlight module with the reflective paper removed according to an embodiment of the utility model.

Legend:

1 a lens body; 2, a light source; 3, reflecting paper; 4 a diffusion plate;

11, mounting a groove; 12 a reflective coating; 13 pillars;

41 annular rib.

Detailed Description

The utility model is further illustrated by the following figures and examples.

Example 1:

as shown in fig. 1 and 3, the present embodiment provides a backlight lens, which is composed of a lens body 1, a mounting groove 11, and a reflective coating 12. The lens body 1 is made of transparent material and has good light transmission performance. The assembly center is provided with a mounting groove 11, and the mounting groove 11 is provided with a notch on the top surface of the lens main body 1, so that the light source 2 can be conveniently taken and placed. The reflective coating 12 is coated on the bottom surface of the lens body 1, and the reflective surface of the reflective coating 12 faces the top surface of the lens body 1. By embedding the light source 2 into the backlight lens, a space required for separately setting the light source 2 is saved, and further, an effect of reducing the OD distance is achieved.

The lens main body 1 adopts a central symmetry structure, and the mounting groove 11 is arranged at the center of the central symmetry structure, so that the light source 2 can be ensured to be positioned at the collection center of the lens main body 1. Therefore, the light emitted from the light source 2 is uniform, and the defect of uneven brightness is avoided.

Because light also can produce the shadow when passing transparent edges and corners structure, avoids appearing the shadow defect, the mounting groove 11 of digging on lens main body 1 adopts cylindric structure for 11 inner walls of mounting groove are slick and sly, and the refraction angle that light irradiation produced on 11 inner walls of mounting groove 11 that light source 2 sent is the same or similar, eliminates the condition that the shadow produced, promotes picture quality.

Four legs 13 are arranged on the bottom surface of the lens for fixing the backlight lens with an external structure.

Example 2:

this embodiment provides a backlight module, which uses the backlight lens in embodiment 1, and further includes a light source 2, a reflective paper 3, and a diffusion plate 4.

As shown in fig. 2 and 3, the light source 2 is disposed in the mounting groove 11, the diffuser plate 4 is directly attached to the top surface of the transparent body, and the support columns are removed to reduce the OD height. Thereby reducing the overall thickness of the LCD TV.

The notch of the mounting groove 11 is covered with the reflective paper 3, the reflective surface of the reflective paper 3 faces the bottom surface of the lens body 1, and the reflective paper and the reflective coating 12 coated on the bottom surface of the lens body 1 cooperate with each other to form a diffuse reflection channel. The light emitted by the light source 2 is divided into two parts, wherein one part of the parallel light directly emitted by the light source 2 directly passes through the lens body 1 and is output after being refracted by the diffusion plate 4; the other part of the parallel light directly emitted by the light source 2 is processed by the diffuse reflection of the reflection paper 3 and the reflection coating 12, passes through the lens body 1 and is refracted by the diffusion plate 4 and then is output.

Diffuse reflection is a phenomenon in which light incident on a rough surface is reflected in various directions. In the embodiment, the reflective paper 3 is disposed opposite to the reflective surface of the reflective coating 12, and after the light beams irradiated from the light source 2 to the reflective paper and the reflective coating are repeatedly reflected for a plurality of times, the incident angles of the light beams irradiated to the diffuser 4 are different, and the refraction angles of the light beams output after being refracted by the diffuser 4 are also different, so that the defects such as shadows and unevenness generated by the angle at which the parallel light cannot be irradiated can be compensated.

The area of the reflective paper 3 determines the area of the reflective paper that can reflect the direct parallel light of the light source 2, and if there is a corner at the edge of the reflective paper 3, the light will interfere with the corner to form a dark image, which affects the picture quality. Therefore, the reflection paper 3 is round and has the edges and corners removed, and the diameter of the reflection paper is larger than that of the installation groove 11, so that the reflection paper is convenient to install and fix. The circle center of the circular reflecting paper 3 is located on the central line of the lens main body 1, so that the projection center of the light source 2 on the reflecting paper 3 is coincided with the circle center of the reflecting paper 3, the light shielding areas of the reflecting paper 3 for the light source 2 to emit light in all directions are the same, and the quality problems that one side is high in brightness and the other side is dim due to eccentric arrangement are avoided.

In order to ensure the light uniformity when the light is finally output to the outside through the diffusion plate 4, the diffusion plate 4 also adopts a centrosymmetric structure, and the central line of the diffusion plate is overlapped with the central line of the lens main body 1. Ensuring that the light source 2 is located on its centre line. Diffuser plate 4 adopts the cyclic annular bead 41 structure outdiffusion that the multilayer concentric circles set up, the section of each layer of cyclic annular bead 41 structure is closed semicircle, close semicircular secant part place plane and laminate in lens main body 1 top surface, semicircular part place cambered surface is used for refracting light, the homogeneity of concentric ring structure guarantee refracting light, and the cross-section can provide multiple refraction angle for semicircular cambered surface, increase refraction angle and reflection angle's degree, enlarge irradiation range. The whole diffusion plate 4 is made of transparent materials, so that the diffusion plate has light transmission performance, and the effect of light diffusion output is achieved by matching with the lens.

Various technical features in the above embodiments may be arbitrarily combined as long as there is no conflict or contradiction in the combination between the features, but is limited to the space and is not described one by one.

The present invention is not limited to the above-described embodiments, and various changes and modifications of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.

Claims

1. A backlight module is characterized by comprising a backlight lens, a light source, reflecting paper and a diffusion plate; the backlight lens comprises a lens main body, a mounting groove formed in the center of the lens main body and a reflective coating coated on the bottom surface of the lens; the lens main body is of a central symmetrical structure, the inner cavity of the mounting groove is cylindrical, and the bottom surface of the lens main body is provided with a foot post; the light source sets up in the mounting groove, reflection paper covers in the notch department of mounting groove, reflection paper and reflection coating constitute the diffuse reflection passageway, the top surface setting of diffuser plate laminating lens main part, the light that the light source sent carries out the refraction outdiffusion through lens main part and diffuser plate again after the diffuse reflection by the diffuse reflection passageway.

2. The backlight module as claimed in claim 1, wherein the reflective paper is circular and has a center located on a center line of the lens body.

3. The backlight module as claimed in claim 2, wherein the diameter of the reflective paper is larger than that of the mounting groove.

4. The backlight module as claimed in claim 1, wherein the diffuser plate has a central symmetrical structure, and the central line of the diffuser plate coincides with the central line of the lens body.

5. The backlight module as claimed in claim 4, wherein the diffuser plate has a plurality of layers of annular ribs formed on a surface thereof, the annular ribs being concentrically arranged, and the centers of the annular ribs being located on a center line of the lens body.

6. The backlight module of claim 5, wherein the cross-section of each of the annular ribs is a closed semicircle, and the surface of the closed semicircle where the cut line is located is attached to the top surface of the lens body.