WO2020042692A1

WO2020042692A1 - Backlight module and display apparatus

Info

Publication number: WO2020042692A1
Application number: PCT/CN2019/089140
Authority: WO
Inventors: 李波涛; 姜旭东; 张连贺
Original assignee: 青岛海信电器股份有限公司
Priority date: 2018-08-31
Filing date: 2019-05-29
Publication date: 2020-03-05
Also published as: CN109143680A

Abstract

Provided are a backlight module and a display apparatus. The backlight module comprises: a light guide plate (11), multiple light sources (12) which are located on a light incident side of the light guide plate (11) and arranged in a straight line, and a microstructure layer (13) which is located on a light emergent side of the light guide plate (11) or a side opposite the light emergent side of the light guide plate (11), wherein the microstructure layer (13) comprises multiple strip-shaped convex microstructures (131) extending in parallel, and the extension direction of each of the strip-shaped convex microstructures (131) is parallel to the extension direction of strip-shaped regions (R) of the light guide plate (11); the microstructure layer (13) is used for converging the emergent light of all the strip-shaped regions (R) of the light guide plate (11) toward a central line, such that the emergent light of two adjacent strip-shaped regions (R) does not overlap; and the central line is parallel to the central line of the extension direction of the strip-shaped regions (R). Since the microstructure layer (13) can converge the emergent light of all the strip-shaped regions (R) of the light guide plate (11) toward a central line, such that the emergent light of two adjacent strip-shaped regions (R) does not overlap, the light emission crosstalk between adjacent strip-shaped regions (R) is avoided, and the display effect of dimming in regions is further improved.

Description

Backlight module and display device

Cross-reference to related applications

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on August 31, 2018, with application number 201811015339.3, and with the application name "a backlight module and display device", the entire contents of which are incorporated herein by reference. in.

Technical field

The present disclosure relates to the field of display technology, and in particular, to a backlight module and a display device.

Background technique

With the development of display technology, liquid crystal display technology is widely used in the display field. The liquid crystal display panel itself cannot emit light, and the backlight module is required to provide the brightness required for its display. However, due to the limitation of the characteristics of the liquid crystal panel itself, light leakage exists to varying degrees, and there is a bottleneck in the improvement of contrast.

Summary of the Invention

The present disclosure provides a backlight module and a display device, which converge outgoing light in each area of the backlight module to avoid light crosstalk between adjacent areas.

Some embodiments of the present disclosure provide a backlight module including a light guide plate, a plurality of linearly arranged light sources located on a light entrance side of the light guide plate, and a light guide plate located on a light exit side of the light guide plate or on the light guide plate. The microstructure layer on the opposite side from the light exit side; wherein,

Each of the light sources corresponds to a strip-shaped area of the light guide plate; the strip-shaped area of the light guide plate is used to conduct the outgoing light of the corresponding light source;

The microstructure layer includes: a plurality of strip-shaped convex microstructures extending in parallel, an extension direction of each of the strip-shaped convex microstructures is parallel to an extension direction of a strip-shaped area of the light guide plate;

The microstructure layer is used for converging the light emitted from each stripe area of the light guide plate toward the center line, so that the light emitted from two adjacent stripe areas do not overlap each other; the centerline is parallel to the center line The centerline of the extending direction of the strip-shaped area.

In some embodiments, an extending direction of the strip-shaped region and an extending direction of a straight line formed by arranging the light sources are mutually perpendicular, and a width of the strip-shaped region along a direction perpendicular to the extending direction of the strip-shaped region corresponds to The coverage width of the light rays projected by the light source onto the light incident surface of the light guide plate is equal.

In some embodiments, the cross-section width of the strip-shaped convex microstructure gradually decreases along a set direction along a set direction, and the set direction is perpendicular to the light exit surface of the light guide plate and gradually moves away from the The direction of the light emitting surface.

In some embodiments, the cross-section of the strip-shaped raised microstructure along a direction perpendicular to the extension direction is triangular or trapezoidal.

In some embodiments, a cross-section height of the strip-shaped convex microstructures perpendicular to the extension direction is 10-100 μm, and a cross-section width is 50-600 μm.

In some embodiments, the material of the microstructure layer is a resin material.

In some embodiments, the backlight module further includes a first adhesive layer between the microstructure layer and the light guide plate, and the first adhesive layer is used to adhere the microstructure layer. With the light guide plate.

In some embodiments, the backlight module further includes a quantum dot layer on a light emitting surface of the light guide plate, and a protective layer on a surface of the quantum dot layer facing away from the light guide plate.

In some embodiments, the microstructure layer is located on a side of the light guide plate facing away from the quantum dot layer; or the microprism layer is located on a side of the protective layer facing away from the quantum dot layer.

In some embodiments, the microstructure layer is located on a side of the light guide plate facing away from the quantum dot layer, and the backlight module further includes: a second portion between the light guide plate and the microstructure layer. An adhesive layer, where the second adhesive layer is used for adhering the microstructure layer and the light guide plate;

Alternatively, the microstructure layer is located on a side of the protective layer facing away from the quantum dot layer, and the backlight module further includes: a third adhesive layer between the protective layer and the microstructure layer, The third adhesive layer is used for adhering the microstructure layer and the protective layer.

In some embodiments, the light source is a blue light emitting diode light source.

In some embodiments, the backlight module further includes a back plate located on a side opposite to the light exit side of the light guide plate, a reflection plate located on a side surface of the back plate facing the light guide plate, and the light guide plate. The light plate faces away from the optical film on the side of the back plate.

According to some embodiments of the present disclosure, a display device is provided, which includes any one of the backlight modules described above and a display panel located on a light emitting side of the backlight module.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is one of the schematic cross-sectional structures of a backlight module according to an embodiment of the present disclosure;

FIG. 2 is a second schematic cross-sectional structure view of a backlight module according to an embodiment of the present disclosure; FIG.

3 is a schematic perspective view of the structure of the backlight module shown in FIG. 1;

FIG. 4 is a schematic cross-sectional structure view along the II ′ direction in FIG. 3; FIG.

5 is a schematic cross-sectional structure diagram of a strip-shaped raised microstructure according to an embodiment of the present disclosure;

6 is a third schematic cross-sectional structure view of a backlight module according to an embodiment of the present disclosure;

FIG. 7 is a fourth schematic sectional structure diagram of a backlight module according to an embodiment of the present disclosure;

FIG. 8 is a fifth schematic cross-sectional structure view of a backlight module according to an embodiment of the present disclosure; FIG.

FIG. 9 is a sixth schematic cross-sectional structure view of a backlight module according to an embodiment of the present disclosure; FIG.

FIG. 10 is a seventh schematic cross-sectional structure of a backlight module according to an embodiment of the present disclosure; FIG.

FIG. 11 is a schematic sectional structure diagram 8 of a backlight module according to an embodiment of the present disclosure;

FIG. 12 is a ninth cross-sectional structure diagram of a backlight module according to an embodiment of the present disclosure; FIG.

FIG. 13 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present disclosure.

detailed description

Embodiments of the present disclosure provide a backlight module and a display device, which converge outgoing light in each area of the backlight module to avoid crosstalk of light between adjacent areas.

In order to make the objectives, technical solutions, and advantages of the present disclosure more clear, the present disclosure will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

Local dimming technology refers to dividing the backlight of a liquid crystal display device into a plurality of small areas. During operation, the brightness of the backlight is adjusted according to the gray scale of the corresponding small area corresponding to the content displayed by the liquid crystal display panel. To achieve the purpose of energy saving and enhanced picture quality. Therefore, a scheme technology of local dimming of the backlight module is proposed, which can control the backlight of different areas independently. Then, when the highlighted image in the display image corresponds to the maximum brightness of the backlight, in the image The backlight corresponding to the dark part can reduce the brightness, so that the displayed image can achieve better contrast.

However, the light emitted by current backlight modules has a large divergence angle. Even if a local dimming dimming scheme is used, the light in adjacent areas still has the problem of crosstalk. The light emitted from the area will enter its adjacent area. Reduce the area dimming effect of the backlight module.

As shown in FIG. 1, an embodiment of the present invention provides a backlight module, including: a light guide plate 11, a plurality of linearly arranged light sources 12 on a light entrance side of the light guide plate, and a light guide plate 11 on a light exit side or a light guide plate. The microstructure layer 13 on the opposite side of the light emitting side. As shown in FIG. 1, the microstructure layer 13 is located on the light exit side of the light guide plate 11. As shown in FIG. 2, the microstructure layer 13 is located on the opposite side of the light guide plate from the light exit side.

FIG. 3 is a schematic diagram of the three-dimensional structure of the backlight module shown in FIG. 1. The light incident surface of the light guide plate 11 provided by the embodiment of the present disclosure is a side surface of the light guide plate, and the light exit plate of the light guide plate is an upper surface. The light guide plate 11 includes a plurality of strip-shaped regions R extending in parallel, and each light source 12 corresponds to a strip-shaped region R of the light-guide plate; the extending direction of the strip-shaped regions R and the extending direction of the straight lines formed by aligning the light sources 12 are mutually perpendicular. Because the light emitted from the light guide plate has a certain divergence angle, the light between adjacent strip areas overlaps, which will cause the phenomenon of crosstalk, which is not conducive to the effect of area dimming. Therefore, in the embodiment of the present disclosure, as shown in FIG. 1 and FIG. 2, a microstructure layer 13 is added on the light exit side of the light guide plate 11 or on the side opposite to the light exit side of the light guide plate. The light emitted from the stripe region R converges toward the center line, so that the light emitted from two adjacent stripe regions does not overlap with each other; the light-emitting crosstalk between the adjacent stripe regions is avoided. In the embodiment of the present disclosure, the center line of the strip-shaped region is a center line parallel to the extending direction of the strip-shaped region.

Wherein, as shown in FIG. 3, the width of the strip-shaped region R along the direction perpendicular to the extending direction of the strip-shaped region is equal to the width of the light coverage of the corresponding light source 12 projected on the light-incident surface of the light guide plate; The light emitted from the corresponding light source 12 is conducted. The light emitted from the light source 12 is incident at a set angle into the strip-shaped area of the corresponding light guide plate, and total reflection occurs in the strip-shaped area, and the light is finally emitted from the light exit hole of the light exit surface of the light guide plate. In the area of area dimming, each light source and the corresponding bar-shaped area of the light guide plate constitute a dimming block. Each dimming block can be adjusted separately by adjusting the brightness of the light source to achieve the area. The purpose of dimming.

The three-dimensional structure of the microstructure layer 13 is shown in FIG. 3. The microstructure layer 13 includes a plurality of strip-shaped convex microstructures 131 extending in parallel, and each strip-shaped convex microstructure 131 extends in a direction parallel to the strip shape of the light guide plate. The direction in which the region R extends. The strip-shaped convex microstructures 131 can converge the light emitted from the light-emitting surface of the light guide plate and then emit the light, thereby avoiding crosstalk between the light emitted from two adjacent strip-shaped regions.

As shown in FIG. 4, the cross-sectional structure of the microstructure layer 13 along the II ′ direction in FIG. 3. The cross-sectional width of the strip-shaped convex microstructure 131 along the direction perpendicular to the extension direction gradually decreases along the setting direction indicated by the arrow in FIG. 4. The setting direction is a direction perpendicular to the light guide plate 11 and gradually away from the light emitting surface of the light guide plate. The cross-section of the bar-shaped convex microstructure 131 is set to follow a tapered pattern away from the light guide plate, so that the bar-shaped convex microstructure 131 has an inclined surface at an inclined angle with the light exit surface of the light guide plate, which makes light incident on the bar-shaped convex From the boundary between the microstructure 131 and the air, the incident angle no longer meets the total reflection condition and can be emitted outward. At this time, the exit angle of the light is compared with the exit angle of the light directly emitted from the light guide plate. The light has a converging effect. Then, the outgoing light rays in the strip-shaped areas of the light guide plate converge toward the center line, which can avoid the problem of light crosstalk between adjacent dimming areas, which is beneficial to further improve the area dimming effect. In practical applications, the cross-sectional pattern of the strip-shaped raised microstructure 131 may be a triangle as shown in FIG. 4 or a trapezoid as shown in FIG. 5. In addition, other tapered patterns may be used. Here, No restrictions.

After the cross-sectional pattern of the bar-shaped convex microstructure 131 is fixed, by adjusting the ratio of the height and width of the bar-shaped convex microstructure 131, the inclination angle of the inclined surface of the bar-shaped convex microstructure 131 can be adjusted, so that the Exit angle. Therefore, in practical applications, the cross-sectional height and width of the strip-shaped protruding microstructures 131 can be adjusted accordingly to meet actual needs. In the embodiment of the present disclosure, through multiple simulations and experimental verifications, the cross-sectional height h of the strip-shaped convex microstructures 131 along the perpendicular direction is set within the range of 10-100 μm, and the cross-section of the strip-shaped convex microstructures 131 is When the width w is set in the range of 50-600 μm, the brightness of the light emitted from the light guide plate is higher, and the light convergence effect is better.

In specific implementation, in the above-mentioned backlight module provided in the embodiment of the present disclosure, the material of the light guide plate 11 may be silicon dioxide; the material of the microstructure layer 13 may be a resin material, and the resin material may be highly transparent. The resin film is formed into strip-shaped convex microstructures of a microstructure layer by die imprinting. For example, the resin material used may be polyethylene terephthalate (PET) or polymethyl methacrylate (PMMA). Compared with glass materials, the production process using resin materials is less uncomfortable, the production cost is lower, and the yield can be improved during the production process.

In an implementation manner, as shown in FIG. 1, the microstructure layer 13 may be located on one side of the light emitting surface of the light guide plate 11; or, as shown in FIG. 2, the microstructure layer 13 may also be located on the light emitting plate 11 The opposite side of the face. In practical applications, as shown in FIGS. 1 and 2, the microstructure layer 13 may be directly formed on the surface of the light guide plate 11. In the actual manufacturing process, a resin layer can be formed on the surface of the light guide plate, and then a microstructured mold is used to laminate the resin into a microstructure at a certain temperature. Since the above-mentioned microstructure layer 13 provided in the embodiment of the present disclosure is made of a resin material, the production cost is low, and the microstructure is easy to be compacted. When the microstructure has defects and defects, the resin layer only needs to be wiped off and recoated. Just close. Regardless of which side of the light guide plate the microstructure layer 13 is disposed on, the light emitted from the light guide plate can converge. The microstructure layer 13 is disposed on the light-emitting surface side of the light guide plate 11, because the inclined surface of the strip-shaped convex microstructure 131 can destroy the total reflection of the light, and at the same time, the angle of the light's exit is deflected toward the centerline, and the light is concentrated Role. The microstructure layer 13 is disposed on the opposite side of the light guide surface of the light guide plate. Due to the function of the strip-shaped convex microstructure 131, about 50% of the light can be reflected on its inclined surface, and the direction of the reflected light is almost perpendicular to The light exit surface of the light guide plate can be emitted from the light exit surface of the light guide plate at a small divergence angle.

In another implementation manner, as shown in FIG. 6 and FIG. 7, the backlight module further includes: a first adhesive layer 14 located between the microstructure layer 13 and the light guide plate 11, the first adhesive layer 14 is used for bonding the microstructure layer 13 and the light guide plate 11. In the actual manufacturing process, the flat surface of the prepared microstructure layer can be adhered to the first adhesive layer 14, and then the adhesive microstructure layer can be adhered to the surface of the light guide plate 11. It is produced by the above bonding method. When the microstructure of the microstructure layer is found to be defective, the microstructure layer can be peeled directly on the surface of the light guide plate without damaging the structure of the light guide plate, so that the light guide plate can be reused continuously. .

In practical applications, the backlight module of any of the above structures can be used for area dimming, so that the display device presents a brighter and darker display image. The light source 12 in any of the above-mentioned backlight modules may be a white light emitting diode light source. In addition, the light source 12 used in the backlight module may also adopt a blue light emitting diode. At this time, if the final emitted light of the backlight module is to be white light, as shown in FIGS. 8 and 9, the backlight module further includes a quantum dot layer 15 located on the light emitting surface of the light guide plate 11, and a quantum dot layer 15 facing away from A protective layer 16 on one surface of the light guide plate 11. The quantum dot layer 15 may include a mixture of a red quantum dot material and a green quantum dot material, and red light and green light may be generated under the excitation of blue light, so that the generated red light, green light, and blue light emitted by the light emitting diode are mixed into White light finally achieves the effect of emitting white light.

In the backlight module of this structure, as shown in FIG. 8, the microstructure layer 13 may be located on a side of the light guide plate 11 facing away from the quantum dot layer 15; or, as shown in FIG. 9, the microstructure layer 13 may also be located on a protection layer. The layer 16 faces away from the side of the quantum dot layer 15. Similarly, the microstructure layer 13 may be directly formed on the back surface of the light guide plate 11 by embossing, or formed on the surface of the protective layer 18. When the microstructure layer has defects and defects, the resin layer only needs to be wiped and recoated, and the light guide plate can be reused, reducing the production cost. The converging principle of the outgoing light by the microstructure layer 13 is the same as the above principle, and will not be repeated here.

In another implementation manner, the microstructure layer 13 may also be adhered to the surface of the light guide plate 11 or the protective layer 16 in a laminating manner. As shown in FIG. 10, when the microstructure layer 13 is located on a side of the light guide plate 11 facing away from the quantum dot layer 15, the backlight module further includes a second adhesive layer 14 ′ located between the light guide plate 11 and the microstructure layer 13. The second adhesive layer 14 ′ is used to bond the microstructure layer 13 and the light guide plate 11; as shown in FIG. 11, when the microstructure layer 13 is located on a side of the protective layer 16 facing away from the quantum dot layer 15, the backlight module It also includes a third adhesive layer 14 ″ located between the protective layer 16 and the microstructure layer 13. The third adhesive layer 14 ″ is used to bond the microstructure layer 13 and the protective layer 16. In the actual manufacturing process, the microstructure layer 13 may be bonded to the second adhesive layer 14 ′ or the third adhesive layer 14 ″ described above, and then the adhesive microstructure layer 13 may be bonded to the light guide plate 11. Or the surface of the protective layer 16. When the microstructure layer is found to be defective, the microstructure layer 13 can be peeled directly on the surface of the light guide plate or the surface of the protective layer without damaging the inherent structure of the light guide plate, so that the light guide plate can continue reuse.

In the above-mentioned backlight module provided by the embodiment of the present disclosure, the protective layer 16 may be made of a material that blocks water and oxygen, so as to ensure that external water and oxygen do not invade into the quantum dot layer and damage the quantum dot material. The first adhesive layer 14, the second adhesive layer 14 ′, and the third adhesive layer 14 ″ may be made of materials such as acrylate pressure-sensitive adhesive, which is not limited herein.

Further, in the above-mentioned backlight module provided in the embodiment of the present disclosure, as shown in FIG. 12, the backlight module further includes a back plate 17 located on the opposite side of the light guide side of the light guide plate 11, and a light guide plate 11 located on the side of the back plate 17 The reflective plate 18 on one side surface, and the optical film 19 on the light guide plate 11 side facing away from the back plate 17. In specific implementation, the optical film 19 may include: a diffusion sheet 191 and a light enhancement sheet 192; wherein the diffusion sheet 191 is located between the light enhancement sheet 192 and the light guide plate 11. The reflecting plate 18 can reflect the light incident into the back plate direction back to the light guide plate 11 to increase the utilization rate of light; and the diffusion sheet 191 can homogenize the light emitted from the light guide plate to improve the brightness; the light increasing plate 192 can add a light guide plate The brightness of the light emitted from the front improves the efficiency of light use.

Based on the same disclosed concept, an embodiment of the present disclosure further provides a display device. As shown in FIG. 13, the display device includes any one of the above-mentioned backlight module 100 and a display panel 200 on a light-emitting side of the backlight module 100. The display panel 200 may be a liquid crystal display panel, and the display device may be a liquid crystal display, a liquid crystal television, or a mobile device such as a mobile phone, a tablet computer, or a smart album. Since the principle of the display device to solve the problem is similar to the above-mentioned backlight module, the implementation of the display device can refer to the implementation of the above-mentioned backlight module, and the duplicated details will not be repeated.

The backlight module and the display device provided in the embodiments of the present disclosure include: a light guide plate, a plurality of linearly arranged light sources located on the light entrance side of the light guide plate, and a light guide plate on the light exit side of the light guide plate or a side opposite to the light exit side of the light guide plate A microstructure layer; wherein each light source corresponds to a strip-shaped area of the light guide plate; the strip-shaped area of the light guide plate is used to conduct the light emitted by the corresponding light source; the microstructure layer includes: a plurality of strip-shaped protrusions extending in parallel Structure, the extending direction of each strip convex microstructure is parallel to the extending direction of the strip area of the light guide plate; the microstructure layer is used to converge the light emitted from each strip area of the light guide plate to the center line, so that two adjacent The light emitted from the strip areas does not overlap each other; the center line is a center line parallel to the extending direction of the strip area. Because the microstructure layer can converge the light emitted from each stripe area of the light guide plate toward the center line, so that the light exited from two adjacent stripe areas no longer overlap, and the luminous crosstalk between adjacent stripe areas is avoided. , Thereby improving the display effect of area dimming.

Although the preferred embodiments of the present disclosure have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic inventive concepts. Therefore, the following claims are intended to be construed to include the preferred embodiments and all changes and modifications that fall within the scope of the disclosure.

Obviously, those skilled in the art can make various modifications and variations to the present disclosure without departing from the spirit and scope of the present disclosure. In this way, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalent technologies, the present disclosure also intends to include these modifications and variations.

Claims

A backlight module includes a light guide plate, a plurality of linearly arranged light sources located on a light entrance side of the light guide plate, and a micro light source located on a light exit side of the light guide plate or on a side opposite to the light exit side of the light guide plate. Structural layer;

Each of the light sources corresponds to a strip-shaped area of the light guide plate; the strip-shaped area of the light guide plate is used to conduct the outgoing light of the corresponding light source;

The microstructure layer includes: a plurality of strip-shaped convex microstructures extending in parallel, an extension direction of each of the strip-shaped convex microstructures is parallel to an extension direction of a strip-shaped area of the light guide plate;

The microstructure layer is used for converging the light emitted from each stripe area of the light guide plate toward the center line, so that the light emitted from two adjacent stripe areas do not overlap each other; the centerline is parallel to the center line The centerline of the extending direction of the strip-shaped area.
The backlight module according to claim 1, wherein an extending direction of the stripe region is perpendicular to an extending direction of a straight line formed by arranging the light sources, and the stripe region is perpendicular to the extending direction of the stripe region. The width is equal to the corresponding light coverage width of the light source projecting onto the light incident surface of the light guide plate.
The backlight module according to claim 1, wherein a cross-sectional width of the strip-shaped convex microstructure along a perpendicular direction gradually decreases along a set direction, and the set direction is perpendicular to a light exit surface of the light guide plate. And gradually away from the direction of the light emitting surface.
The backlight module according to claim 1, wherein a cross section of the strip-shaped convex microstructure along a direction perpendicular to the extending direction is triangular or trapezoidal.
The backlight module according to claim 1, wherein a cross-sectional height of the strip-shaped convex microstructure perpendicular to the extending direction is 10-100 μm, and a cross-sectional width is 50-600 μm.
The backlight module according to claim 1, wherein a material of the microstructure layer is a resin material.
The backlight module according to claim 1, further comprising: a first adhesive layer between the microstructure layer and the light guide plate, the first adhesive layer being used for adhesion The microstructure layer and the light guide plate.
The backlight module according to any one of claims 1 to 6, further comprising: a quantum dot layer located on a light emitting surface of the light guide plate, and a side of the quantum dot layer facing away from the light guide plate Surface protective layer.
The backlight module according to claim 8, wherein the microstructure layer is located on a side of the light guide plate facing away from the quantum dot layer; or, the microstructure layer is located on a side of the protective layer facing away from the quantum dot layer. One side.
The backlight module according to claim 9, wherein the microstructure layer is located on a side of the light guide plate facing away from the quantum dot layer, and the backlight module further comprises: located on the light guide plate and the microstructure layer A second adhesive layer therebetween, the second adhesive layer is used to adhere the microstructure layer and the light guide plate;

Alternatively, the microstructure layer is located on a side of the protective layer facing away from the quantum dot layer, and the backlight module further includes: a third adhesive layer between the protective layer and the microstructure layer, The third adhesive layer is used for adhering the microstructure layer and the protective layer.
The backlight module according to claim 8, wherein the light source is a blue light emitting diode light source.
The backlight module according to any one of claims 1 to 7, further comprising: a back plate located on a side opposite to a light exit side of the light guide plate, and a side of the back plate facing the light guide plate A reflective plate on the surface, and an optical film on a side of the light guide plate facing away from the back plate.
A display device includes the backlight module according to any one of claims 1-12 and a display panel located on a light emitting side of the backlight module.