CN119575716A

CN119575716A - Backlight module and display device

Info

Publication number: CN119575716A
Application number: CN202311140901.6A
Authority: CN
Inventors: 郭康; 陈宏�; 段正; 谷新
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Technology Development Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Technology Development Co Ltd
Priority date: 2023-09-05
Filing date: 2023-09-05
Publication date: 2025-03-07

Abstract

The present invention discloses a backlight module and a display device. In a specific embodiment, the backlight module includes a light-emitting layer and a light-adjusting layer arranged on the light-emitting side of the light-emitting layer, the light-emitting layer includes a plurality of light-emitting units; the light-adjusting layer includes an optical waveguide layer, a first light homogenizing structure, a first reflective structure, and a second reflective structure, the first light homogenizing structure is located on the side of the optical waveguide layer close to the light-emitting layer, the first reflective structure is located on the side of the optical waveguide layer close to or away from the light-emitting layer, the second reflective structure is located on the side of the first light homogenizing structure close to the light-emitting layer, the orthographic projection of the light-emitting unit on the optical waveguide layer covers the orthographic projection of the first reflective structure on the optical waveguide layer, the orthographic projection of the second reflective structure on the optical waveguide layer at least partially overlaps with the orthographic projection of the first light homogenizing structure on the optical waveguide layer, and the orthographic projection of the second reflective structure on the optical waveguide layer surrounds the orthographic projection of the light-emitting unit on the optical waveguide layer.

Description

Backlight module and display device

Technical Field

The present disclosure relates to the field of display technology. And more particularly, to a backlight module and a display device.

Background

The backlight module taking the LED (LIGHT EMITTING Diode) as the backlight source has the advantages of wide color gamut, excellent image quality, long service life, light weight, beautiful appearance, strong stability, green and environment protection, and the like, and is widely applied to liquid crystal display products. In particular, the direct type LED backlight has the advantages of high brightness, good uniformity, high energy utilization rate, high contrast ratio and the like, and is widely used in large-size liquid crystal panels and excellent in performance.

However, in practical applications, since the direct type LED backlight source is not provided with a light guide plate, in order to ensure the uniformity of the brightness of the backlight source, a larger light mixing height is required to freely mix the light emitted by the backlight source, or more diffusion plates are used to achieve the required brightness uniformity, which results in the problem of larger thickness of the backlight module.

Disclosure of Invention

An object of the present disclosure is to provide a backlight module and a display device, so as to solve at least one of the problems in the prior art.

In order to achieve the above purpose, the present disclosure adopts the following technical scheme:

the first aspect of the present disclosure provides a backlight module, including a light emitting layer and a light adjusting layer disposed on a light emitting side of the light emitting layer, where the light emitting layer includes a plurality of light emitting units;

The light regulating layer comprises an optical waveguide layer, a first light homogenizing structure, a first reflecting structure and a second reflecting structure, wherein the first light homogenizing structure is positioned on one side of the optical waveguide layer, which is close to the light emitting layer, the first reflecting structure is positioned on one side of the optical waveguide layer, which is close to or far away from the light emitting layer, the second reflecting structure is positioned on one side of the first light homogenizing structure, which is close to the light emitting layer, the front projection of the light emitting unit on the optical waveguide layer covers the front projection of the first reflecting structure on the optical waveguide layer, the front projection of the second reflecting structure on the optical waveguide layer at least partially overlaps the front projection of the first light homogenizing structure on the optical waveguide layer, and the front projection of the second reflecting structure on the optical waveguide layer surrounds the front projection of the light emitting unit on the optical waveguide layer.

The light adjusting layer is used for integrally arranging a first reflecting structure, a second reflecting structure and a light homogenizing structure on one side of the light guide layer close to the light emitting layer and one side of the light guide layer far away from the light emitting layer, so that the required light mixing height and the overall thickness of the backlight module are reduced, partial light entering the light guide layer is enabled to realize uniform emergent through repeated reflection and scattering, the first reflecting structure arranged on one side of the light guide layer close to or far away from the light emitting layer transmits more light into the light guide, the light efficiency is further improved, the problem that the brightness uniformity of the backlight module is poor due to the fact that most of light is integrated in a positive view angle can be avoided, the overall thickness of the backlight module is smaller than 1cm, the thickness of the backlight module is reduced, and meanwhile the brightness uniformity of the backlight module is improved.

Alternatively, the first light homogenizing structure is a first light homogenizing structure disposed on a side surface of the optical waveguide layer close to the light emitting layer, or the first light homogenizing structure is formed by a side surface of the optical waveguide layer close to the light emitting layer.

Optionally, the first reflective structure is a reflective layer structure, and the reflective layer structure is located on a side of the optical waveguide layer away from the light emitting layer.

Optionally, the reflectivity of the reflective layer structure is greater than or equal to 20%.

Optionally, the first reflective structure is an optical coupling structure.

Optionally, the optical coupling structure is a tilted grating or a blazed grating.

Optionally, the light conditioning layer further comprises a second light homogenizing structure, the second light homogenizing structure being located on a side of the optical waveguide layer remote from the light emitting layer, an orthographic projection of the second light homogenizing structure on the optical waveguide layer surrounding an orthographic projection of the light emitting unit on the optical waveguide layer.

Optionally, the light conditioning layer further comprises a third light homogenizing structure disposed on a side of the light emitting unit close to the optical waveguide layer, and an orthographic projection of the light emitting unit on the optical waveguide layer covers an orthographic projection of the third light homogenizing structure on the optical waveguide layer.

Optionally, the backlight module further includes a protective layer located at a side of the light adjusting layer away from the light emitting layer.

A second aspect of the present disclosure provides a display device, including the backlight module provided in the first aspect of the present disclosure.

The beneficial effects of the present disclosure are as follows:

According to the technical scheme, the light adjusting layer is arranged on the light emitting side of the light emitting layer, the light emitted by the light emitting layer is emitted after being homogenized, the light adjusting layer comprises a light guide layer, a first light homogenizing structure arranged on one side of the light guide layer, which is close to the light emitting layer, a first reflecting structure arranged on one side of the light guide layer, which is close to or far from the light emitting layer, and a second reflecting structure arranged on one side of the first light homogenizing structure, which is close to the light emitting layer, wherein the light guide layer, the first light homogenizing structure arranged on one side of the light guide layer, which is close to the light emitting layer, and the second reflecting structure arranged on one side of the first light homogenizing structure, enable part of light entering the light guide layer to realize uniform emission through repeated reflection and scattering, the first reflecting structure arranged on one side of the light guide layer, which is close to or far from the light emitting layer, transmits more light into the light guide layer, further improves light efficiency, and can avoid that most of light is integrated on a positive view angle, so that the backlight uniformity is poor, and the thickness uniformity of the backlight module is improved, and the thickness uniformity of the backlight module is less than 1 cm.

Drawings

The following describes in further detail the specific embodiments of the present disclosure with reference to the drawings.

Fig. 1 is a schematic view showing a structure of a display device in the related art.

Fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the disclosure.

Fig. 3 is a schematic structural diagram of a backlight module according to another embodiment of the disclosure.

Fig. 4 is a schematic structural diagram of a backlight module according to another embodiment of the disclosure.

Fig. 5 is a schematic structural diagram of a backlight module according to another embodiment of the disclosure.

Fig. 6 is a schematic structural diagram of a backlight module according to another embodiment of the disclosure.

Fig. 7 is a schematic structural diagram of a backlight module according to another embodiment of the disclosure.

Fig. 8 is a schematic structural diagram of a backlight module according to another embodiment of the disclosure.

Fig. 9 is a schematic structural diagram of a backlight module according to another embodiment of the disclosure.

Fig. 10 shows a schematic structural diagram of a light emitting layer provided in an embodiment of the present disclosure.

Fig. 11 shows a schematic structural diagram of a light emitting layer according to another embodiment of the present disclosure.

Fig. 12 shows a flowchart of a preparation of a backlight module according to an embodiment of the disclosure.

Detailed Description

The terms "on," "forming on," and "disposed on" in this disclosure may mean that one layer is formed directly or disposed on another layer, or that one layer is formed or disposed on another layer, i.e., that other layers are also present between the two layers.

It should be noted that although the terms "first," "second," etc. may be used herein to describe various elements, components, elements, regions, layers and/or sections, these elements, components, elements, regions, layers and/or sections should not be limited by these terms. Rather, these terms are used to distinguish one component, member, element, region, layer and/or section from another.

Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.

In order to ensure the uniformity of light emission of the LED backlight display module, the LED backlight display device of the related art needs to be provided with at least two layers of diffusion films, and has a larger light mixing height, as shown in fig. 1, and is a schematic structural diagram of the conventional LED backlight display device, and the LED backlight display device comprises a substrate 10, an LED light source 20, a color conversion film 30, a first diffusion film 40, a second diffusion film 50 and a liquid crystal panel 60, which are sequentially stacked. With this structure, the light is emitted from the LED light source 20 to the color conversion film 30 to be emitted as white light, and the white light is sequentially diffused through the first and second diffusion films 40 and 50 to reach the liquid crystal panel 60 to improve the uniformity of the light. Because the light mixing height is large, the thickness of the existing backlight module is large due to more diffusion film layers, the range is 3-5cm, and the structure of the backlight module needs to be improved.

In view of this, an embodiment of the present disclosure provides a backlight module, as shown in fig. 2, including a light emitting layer 101 and a light adjusting layer disposed on a light emitting side of the light emitting layer 101;

Wherein the light emitting layer 101 includes a plurality of light emitting units 102;

The light conditioning layer comprises an optical waveguide layer 103, a first light homogenizing structure 104, a first reflecting structure 106 and a second reflecting structure 105,

The first light homogenizing structure 104 is located on the side of the optical waveguide layer 103 close to the light emitting layer 101;

the first reflecting structure 106 is located on a side of the optical waveguide layer 103 close to or far from the light emitting layer 101;

the second reflecting structure 105 is located on the side of the first light homogenizing structure 104 close to the light emitting layer 101;

The front projection of the light emitting unit 102 onto the optical waveguide layer 103 covers the front projection of the first reflective structure 106 onto the optical waveguide layer 103, the front projection of the second reflective structure 105 onto the optical waveguide layer 103 at least partly overlaps the front projection of the first light homogenizing structure 104 onto the optical waveguide layer 103, the front projection of the second reflective structure 105 onto the optical waveguide layer 103 surrounding the front projection of the light emitting unit 102 onto the optical waveguide layer 103;

The light emitted from the light emitting layer 101 enters the optical waveguide layer 103, part of the light is directly emitted, the other part of the light is totally reflected in the optical waveguide structure, after the part of the light reaches the first light homogenizing structure 104, the light is scattered and is emitted into the second reflecting structure 105 covering the first light homogenizing structure 104 to be reflected into the first light homogenizing structure 104, the light is further scattered, the direction of the light is changed to be emitted into the first light homogenizing structure 104, the light is emitted from the surface of the optical waveguide layer 103 far away from the light emitting layer 101, the homogenized light is obtained, the first reflecting structure 106 can enable the light to be more uniform, the problem that most of the light is concentrated in a positive viewing angle, and poor brightness uniformity is caused is avoided, the light emitted into the first reflecting structure 106 is reflected back into the optical waveguide layer 103, and the light is further scattered, so that more light is emitted in an optical waveguide mode.

In this embodiment, a light adjusting layer is disposed on the light emitting side of the light emitting layer 101, and the light adjusting layer is configured to emit the light after the light emitting layer 101 emits the light, where the light adjusting layer includes an optical waveguide layer 103, a first light homogenizing structure 104 disposed on the side of the optical waveguide layer 103 close to the light emitting layer 101, a first reflecting structure 106 disposed on the side of the optical waveguide layer 103 close to or far from the light emitting layer 101, and a second reflecting structure 105 disposed on the side of the first light homogenizing structure 104 close to the light emitting layer 101, where the light is further transmitted into the optical waveguide, and the thickness uniformity of the backlight module is reduced by the optical waveguide layer 103, the first light homogenizing structure 104 disposed on the side of the optical waveguide layer 103 close to the light emitting layer 101, and the second reflecting structure 105 disposed on the side of the first light homogenizing structure 104 close to the light emitting layer 101, so that part of the light entering the optical waveguide layer 103 is uniformly reflected and scattered multiple times, and the first reflecting structure 106 disposed on the side of the optical waveguide layer 103 close to or far from the light emitting layer 101, so that more light is transmitted into the optical waveguide, and the light efficiency is further improved, and the thickness uniformity of the backlight module is reduced, and the backlight module is also the thickness uniformity is reduced, and the thickness uniformity is 1.

In a specific example, the optical waveguide layer is, for example, an optical waveguide glass, where the optical waveguide glass has a high refractive index, and is composed of a high refractive index core layer and a low refractive index cladding layer, so that light with a specific angle can be totally reflected, and light with a specific angle is limited to propagate inside the waveguide, for example, light with an incident angle greater than thirty degrees is totally reflected in the optical waveguide glass, light with an incident angle less than thirty degrees directly exits, and part of light totally reflected in the optical waveguide glass is reflected into the light homogenizing structure, and the direction of the light is changed by the light homogenizing structure and a reflective metal covering the light homogenizing structure, so that the exit light of the backlight module is further diffused.

It should be noted that the above definition of total reflection for incidence angles greater than thirty degrees is merely an example.

In a specific example, the light emitting layer includes a plurality of light emitting units, and in order to improve light mixing uniformity, the light emitting unit density of the edge area of the backlight module is greater than that of other areas.

In a specific example, the first light homogenizing structure 104 is a first light homogenizing structure 104 disposed on a surface of the optical waveguide layer 103 near a side of the light emitting layer 101, and the first light homogenizing structure 104 is rugged on a side near the light emitting layer 101, so that light incident on the first light homogenizing structure 104 can be more uniformly diffused.

Specifically, the surface of the first light homogenizing structure 104 near the light emitting layer 101 has a plurality of protrusions, and the protrusions may be hemispherical, conical or prismatic, and of course, the shape of the protrusions is not limited to hemispherical, conical or prismatic, and other shapes may be adopted.

In a specific example, as shown in fig. 3, the optical waveguide glass is provided with a first light homogenizing structure on the whole surface near the light emitting layer, so as to reduce the manufacturing cost and further increase the light diffusion degree.

In a specific example, the first light homogenizing structure 104 may be made of transparent polymer and reflective particles, and the light homogenizing structure is an ordered or disordered micron-sized structure, and may be manufactured by thermal reflow, nano-imprinting, or the like.

In this embodiment, the material of the first light homogenizing structure includes reflective particles, so that light rays are emitted in all directions through scattering, and uniformity of the light rays is increased.

In another specific example, as shown in fig. 4, the first light homogenizing structure 104 is formed by a surface of the optical waveguide layer 103 on a side close to the light emitting layer 101.

Specifically, the surface of the optical waveguide layer 103 near the light emitting layer 101 is etched to form an uneven surface by pattern transfer, so that the light entering the first light homogenizing structure 104 can be more uniformly diffused.

In a specific example, the first reflective structure 106 is a reflective layer structure, which is located on a side of the optical waveguide layer 103 remote from the light emitting layer 101.

Specifically, the reflective layer structure is made of metal with high reflectivity, such as metal aluminum, metal silver, and the like.

In a specific example, the reflectivity of the reflective layer structure is greater than 20%, and the orthographic projection area of the reflective structure on the optical waveguide layer 103 is greater than or equal to 20 square micrometers and less than or equal to 200 square micrometers.

It should be noted that, in order to further reduce the thickness of the display module, a first opening is provided on the surface of the optical waveguide layer 103 on the side away from the light emitting layer 101, and the reflective layer structure is fitted into the first opening.

In one specific example, the first reflective structure 106 is an optical coupling structure.

In a specific example, as shown in fig. 5, the optical coupling structure is a blazed grating, which is located on the side of the optical waveguide layer 103 close to the light emitting layer 101, so as to transmit more light into the optical waveguide glass, thereby improving the light efficiency, wherein,

The blazed grating is of a symmetrical structure, the period of the blazed grating is 200-600 nm, the height of the grating is 50-400 nm, the duty ratio of the grating is 0.2-0.8, the inclination angle of the grating is 30-80 degrees, the refractive index of the grating material is 1.7-2.0, and the grating material is a transparent material and has no metal deposition.

It should be noted that the intensity of the spectrum is maximized when the probe is made from the design direction, and this phenomenon is called blaze (blaze), and this grating is called blazed grating. The blaze greatly improves the diffraction efficiency of the grating, and is used as a coupling device of the optical waveguide layer to improve the incidence efficiency of light. And is designed to improve the +1-order diffraction efficiency, the blaze angle of the blazed grating is not particularly limited as long as the grating energy can be concentrated at +1-order.

In a specific example, as shown in fig. 6, the optical coupling structure is an inclined grating, the inclined grating is disposed on a surface of the optical waveguide layer near one side of the light emitting layer 101, so as to transmit more light into the optical waveguide glass, thereby improving the light efficiency, and the inclined grating is a symmetrical structure, so that substantially equal amounts of +1-level and-1-level light enter the optical waveguide structure.

The grating diffraction has 0 order, ±1 order, etc., and the angles and energies of the different orders are different. By setting the parameters of the grating, most of light energy can be concentrated in the orders of a certain angle, and the control of the light direction is realized.

In a specific example, as shown in fig. 7, the optical coupling structure is a slanted grating, which is disposed on a side of the optical waveguide layer away from the light emitting layer 101, wherein,

The inclined grating is of a symmetrical structure.

Specifically, a metal material is deposited between the inclined grating disposed on the side of the optical waveguide layer away from the light emitting layer and the optical waveguide glass, so as to further increase the light reflected into the optical waveguide layer.

In a specific example, the material of the optical coupling structure is an optical resin.

In a specific example, the oblique grating and blazed grating should satisfy at least one of the following conditions to further ensure brightness uniformity of the outgoing light:

The period of the grating is more than or equal to 200nm and less than or equal to 600nm, the grating height is more than or equal to 50nm and less than or equal to 400nm, the grating duty ratio is more than or equal to 0.2 and less than or equal to 0.8, the grating inclination angle is more than or equal to 30 DEG and less than or equal to 80 DEG, and the refractive index of the grating material is more than or equal to 1.7 and less than or equal to 2.

In a specific example, as shown in fig. 8, the light conditioning layer further comprises a second light homogenizing structure 109, the second light homogenizing structure 109 being located on a side of the optical waveguide layer 103 remote from the light emitting layer 101, an orthographic projection of the second light homogenizing structure 109 onto the optical waveguide layer 103 surrounding an orthographic projection of the light emitting unit 102 onto the optical waveguide layer 103. Light emitted from the surface of the part of the optical waveguide structure overlapping with the second light homogenizing structure 109 enters the light homogenizing structure, and the light is further diffused and emitted from the protective layer covering the second light homogenizing structure 109.

The light adjusting layer in this embodiment further includes a second light homogenizing structure 109 located on a side of the optical waveguide layer 103 away from the light emitting layer 101, which receives part of the outgoing light of the optical waveguide layer 103 and further breaks up the light, so as to further increase the brightness uniformity of the backlight module.

In a specific example, as shown in fig. 9, the light conditioning layer further includes a third light homogenizing structure 10A disposed on a side of the light emitting unit 102 close to the optical waveguide layer 103, and an orthographic projection of the light emitting unit 102 on the optical waveguide layer 103 covers an orthographic projection of the third light homogenizing structure 10A on the optical waveguide layer 103.

In a specific example, as shown in fig. 10, the light emitting layer 101 further includes a color conversion layer covering the light emitting unit 102, the color conversion layer including a first color conversion layer 1081 and a second color conversion layer 1082 that are stacked.

The first color conversion layer is, for example, a red color conversion layer, and the second color conversion layer is, for example, a green color conversion layer.

It should be noted that the lamination order of the first color conversion layer and the second color conversion layer is not particularly limited in this embodiment.

In a specific example, the substrate is a glass substrate, and the display device further includes white oil 10C disposed on a side of the glass substrate away from the light homogenizer, the white oil covering the glass substrate.

Specifically, the white oil may include resins (e.g., epoxy resin, polytetrafluoroethylene resin), titanium dioxide (formula TiO 2), and organic solvents (e.g., dipropylene glycol methyl ether), etc. The white oil can be printed by adopting a screen printing process, and the reflectivity of the formed film layer is more than or equal to 80 percent.

Specifically, the LED light emitting chip is directly embedded in the glass substrate, after the light reflected by the first reflecting structure 106 is diffused by the color conversion layer covering the light emitting unit 102, part of the light is incident to the white oil covering the glass substrate through the glass substrate, the reflectivity of the white oil is higher, the light is reflected to the optical waveguide glass, the light emitted by the waveguide is further increased, and the light utilization rate and the light emitting uniformity of the backlight module are improved.

In a specific example, as shown in fig. 11, the light emitting layer 101 further includes a color conversion layer 108 covering the light emitting unit 102, and the color conversion layer 108 includes a first color conversion material and a second color conversion material.

Specifically, the first color conversion material is, for example, red quantum dots, and the second color conversion material is, for example, green quantum dots.

It should be noted that the light emitting unit of the light emitting layer emits blue light, and the color becomes white light after passing through the color conversion layer.

The following describes the preparation process of the backlight module in detail by taking the backlight module shown in fig. 2 as an example, and the preparation process is shown in fig. 12:

Firstly, manufacturing a first reflecting structure on a first surface of an optical waveguide layer, and patterning;

The first reflecting structure is a reflecting metal, and the reflectivity of the reflecting metal is more than or equal to 20%;

Then, a protective layer is deposited on the first surface, and the protective layer covers the first reflective metal layer and plays a role in preventing the reflective metal from being scratched;

specifically, the protective layer is a transparent inorganic film layer or transparent adhesive material, and can be prepared from inorganic materials such as silicon oxide, silicon nitride and the like, and can also be prepared from polymer materials.

Then, manufacturing a light homogenizing structure on the second surface of the optical waveguide glass, forming an uneven microstructure on the surface of the optical waveguide glass by adopting modes such as thermal reflux and nanoimprint to obtain a light homogenizing layer, and patterning the light homogenizing layer to obtain a first light homogenizing structure 104;

Depositing and patterning a reflective metal on the first light homogenizing structure 104 to form a second reflective structure 105 covering the light homogenizing structure;

The second reflective structure 105 is a reflective metal.

The first light homogenizing structure 104 has an arc structure, which can increase the light diffusion area and the reflection area of the second reflecting structure 105, thereby increasing the light utilization rate.

Next, the metal wire 10B is fabricated and patterned, and then the substrate embedded with the LED light source is bonded to the metal wire 10B, and the white oil 10C covering the substrate is formed on the backlight side of the substrate.

It should be noted that the orthographic projection of the light emitting area of the substrate embedded with the LED light source onto the optical waveguide layer 103 covers the orthographic projection of the first reflective metal layer onto the optical waveguide glass, and the orthographic projection of the second reflective structure 105, i.e. the second reflective metal layer, onto the optical waveguide glass at least partially overlaps the orthographic projection of the first light homogenizing structure 104 onto the optical waveguide glass, and the orthographic projection of the second reflective structure 105 onto the optical waveguide glass surrounds the orthographic projection of the light emitting area onto the optical waveguide glass.

By utilizing the structure obtained by the preparation, light rays are emitted to the optical waveguide layer by the LED light source, wherein part of the light rays are emitted directly after meeting the emission condition, part of the light rays are reflected to the first light homogenizing structure by reflection in the optical waveguide layer, the second reflecting structure is diffused by the first light homogenizing structure, part of the light rays are emitted from the optical waveguide layer after being reflected to the first light homogenizing structure by reflection to perform secondary diffusion, the back and forth propagation of the light rays improves the utilization rate of the light rays, meanwhile, the light mixing uniformity is improved, the light mixing height of the backlight module is reduced, and the first light homogenizing structure and the second reflecting structure are integrally arranged on the second surface of the optical waveguide layer, so that the thickness of the backlight module is further reduced.

It should be noted that the LED light source can be replaced with a CCFL light source.

An embodiment of the application provides a display device, which comprises the backlight module.

The display device can be any product or component with a display function, such as a television, a display, a digital photo frame, a mobile phone, a tablet personal computer and the like, wherein the display device also comprises a flexible circuit board, a printed circuit board and a backboard.

In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. All directional indications (such as up, down, left, right, front, rear, top, bottom) in embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular pose (as shown in the drawings), and if the particular pose changes, the directional indication changes accordingly. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

It should be apparent that the foregoing examples of the present disclosure are merely illustrative of the present disclosure and not limiting of the embodiments of the present disclosure, and that various other changes and modifications may be made by one of ordinary skill in the art based on the foregoing description, and it is not intended to be exhaustive of all embodiments, and all obvious changes and modifications that come within the scope of the present disclosure are intended to be embraced by the technical solution of the present disclosure.

Claims

1. A backlight module, characterized in that it comprises a light-emitting layer and a light-adjusting layer arranged on the light-emitting side of the light-emitting layer, wherein the light-emitting layer comprises a plurality of light-emitting units;

The light adjustment layer includes an optical waveguide layer, a first light homogenizing structure, a first reflective structure, and a second reflective structure. The first light homogenizing structure is located on a side of the optical waveguide layer close to the light-emitting layer, the first reflective structure is located on a side of the optical waveguide layer close to or away from the light-emitting layer, the second reflective structure is located on a side of the first light homogenizing structure close to the light-emitting layer, the orthographic projection of the light-emitting unit on the optical waveguide layer covers the orthographic projection of the first reflective structure on the optical waveguide layer, the orthographic projection of the second reflective structure on the optical waveguide layer at least partially overlaps with the orthographic projection of the first light homogenizing structure on the optical waveguide layer, and the orthographic projection of the second reflective structure on the optical waveguide layer surrounds the orthographic projection of the light-emitting unit on the optical waveguide layer.

2. The backlight module according to claim 1, characterized in that:

The first light homogenizing structure is a first light homogenizing structure disposed on a surface of the light waveguide layer close to the light emitting layer, or the first light homogenizing structure is formed by a surface of the light waveguide layer close to the light emitting layer.

3. The backlight module according to claim 1, characterized in that:

The first reflective structure is a reflective layer structure, and the reflective layer structure is located on a side of the optical waveguide layer away from the light-emitting layer.

4. The backlight module according to claim 3, characterized in that:

The reflectivity of the reflective layer structure is greater than or equal to 20%.

5 . The backlight module according to claim 1 , wherein the first reflective structure is a light coupling structure.

6 . The backlight module according to claim 5 , wherein the light coupling structure is a tilted grating or a blazed grating.

7. The backlight module according to claim 1 is characterized in that the light adjustment layer also includes a second light homogenizing structure, the second light homogenizing structure is located on the side of the optical waveguide layer away from the light-emitting layer, and the orthographic projection of the second light homogenizing structure on the optical waveguide layer surrounds the orthographic projection of the light-emitting unit on the optical waveguide layer.

8. The backlight module according to claim 1, characterized in that:

The light adjustment layer further includes a third light homogenizing structure disposed on a side of the light emitting unit close to the light waveguide layer, and the orthographic projection of the light emitting unit on the light waveguide layer covers the orthographic projection of the third light homogenizing structure on the light waveguide layer.

9 . The backlight module according to claim 1 , further comprising a protection layer located on a side of the light regulating layer away from the light emitting layer.

10. A display device, comprising a display panel and a backlight module according to any one of claims 1 to 9.