CN213545001U

CN213545001U - Backlight module, display module and display device

Info

Publication number: CN213545001U
Application number: CN202022281135.3U
Authority: CN
Inventors: 张小齐; 李伟; 郭娟; 韩蓉蓉
Original assignee: Shenzhen Longli Technology Co Ltd
Current assignee: Shenzhen Longli Technology Co Ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-06-25
Anticipated expiration: 2030-10-14

Abstract

One or more embodiments of the specification disclose a backlight module, a display module and a display device. The backlight module comprises a substrate, a light-emitting component and an optical membrane group which are sequentially overlapped, wherein the optical membrane group comprises a diffusion plate, a light conversion film and other optical membranes, the diffusion plate, the light conversion film and the other optical membranes are sequentially overlapped above the light-emitting component, the diffusion plate comprises a light emergent surface, a light incident surface and a side surface, the light emergent surface and the light incident surface are oppositely arranged, the side surface is arranged between the light emergent surface and the light incident surface, and a light processing piece is arranged on the side surface, so that the light mixing uniformity of the backlight module can be improved, and the phenomenon that the edge part of the backlight module is bluish is improved.

Description

Backlight module, display module and display device

Technical Field

This document relates to shows technical field, especially relates to a backlight unit, display module assembly and display device.

Background

The conventional display mainly uses a backlight module to provide a backlight source for the display panel. The backlight module can be divided into a direct type backlight module and a side type backlight module according to an incident mode, the direct type backlight module is directly arranged behind the display panel, the backlight module has the advantage of a narrow frame, and the backlight module is widely applied to the field of large-size display. With the trend of flat panel displays towards the development of light and thin, the light mixing distance of the direct type backlight module is shortened, the light mixing effect can be affected by shortening the light mixing distance, and the most intuitive expression is that after the display using the direct type backlight module with shorter light mixing distance is lightened, the brightness of the edge of the display is obviously higher, and the problem of edge bright frames is caused.

The direct type backlight module generally uses a blue LED + light conversion film technology, and blue light emitted by the blue LED excites the quantum dot thin film to generate white light. However, the number of times of light reflection or refraction at the edge of the backlight module is small, and light mixing imbalance occurs, so that light color difference different from that of other areas often occurs at the edge of the backlight module. The wider frame is usually adopted to hide the area of the edge of the backlight module where the optical chromatic aberration occurs. However, for small-sized products with narrow frames, the blue-emitting region at the edge of the backlight module cannot be completely hidden by adopting the blue LED + light conversion film technology, and the problem of uneven light mixing is faced. Therefore, it is an urgent technical problem to avoid uneven light mixing at the edge of the backlight module and to improve the blue phenomenon at the edge of the backlight module.

Disclosure of Invention

One or more embodiments of the present disclosure provide a backlight module, a display module and a display device, which can improve the uniformity of light mixing of the backlight module and improve the phenomenon of blue emission at the edge of the backlight module.

To solve the above technical problem, one or more embodiments of the present specification are implemented as follows:

in a first aspect, a backlight module is provided, which includes a substrate, a light emitting module, and an optical film group stacked in sequence, where the optical film group includes a diffusion plate, a light conversion film, and other optical films, and the diffusion plate, the light conversion film, and the other optical films are stacked above the light emitting module in sequence, where the diffusion plate includes a light emitting surface and a light incident surface that are arranged oppositely, and a side surface that is arranged between the light emitting surface and the light incident surface, and a light processing element is arranged on the side surface.

In a second aspect, a display module is provided, which comprises a display panel and the backlight module described above.

In a third aspect, a display device is provided, which includes the display module set described above.

It can be seen from the technical scheme that one or more embodiments provided by above this description provide, backlight unit that this application provided, including the base plate, light-emitting component and the optics diaphragm group of superpose in order, light-emitting component includes light guide plate and lamp plate, is provided with the LED lamp on the lamp plate, and the light guide plate setting is in the top of lamp plate, and top here is the direction towards the user when the user uses display terminal. The optical film group comprises a diffusion plate, a light conversion film and other optical films, the diffusion plate, the light conversion film and other optical films are sequentially stacked above the light-emitting assembly, the diffusion plate comprises a light-emitting surface and a light-entering surface which are oppositely arranged, and a side surface arranged between the light-emitting surface and the light-entering surface, the side surface is provided with a light processing piece, the light processing piece at least processes blue light emitted by the light-emitting assembly to the light processing piece, and the blue light is prevented from leaking, so that the light leakage of the blue light or the light brightness enhancement of the edge part of the backlight module can not be caused, the light chromatic aberration of other areas of the backlight module is reduced, the light mixing uniformity of the backlight module can be improved, and the phenomenon that the edge.

Drawings

In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, reference will now be made briefly to the attached drawings, which are needed in the description of one or more embodiments or prior art, and it should be apparent that the drawings in the description below are only some of the embodiments described in the specification, and that other drawings may be obtained by those skilled in the art without inventive exercise.

Fig. 1 is a schematic longitudinal sectional view of a backlight module provided in an embodiment of the present disclosure.

Fig. 2 is a partial enlarged view of the backlight module shown in fig. 1 at C.

Fig. 3 is a partial enlarged view of another backlight module provided in this embodiment.

Fig. 4 is a schematic longitudinal sectional view of another backlight module provided in the embodiments of the present disclosure.

Fig. 5 is a schematic longitudinal sectional view of another backlight module provided in the embodiments of the present disclosure.

10-a substrate; 100-bottom; 110-a side wall; 120-grooves; 130-a boss; 111-a base; 112-a connector; 1110 — a first step; 1120-bottom surface of second step; 1121 — a second step; 20-a lamp panel; 30-a light guide plate; 40-an optical film set; 400-a diffusion plate; 410-a light conversion film; 420-a light treatment member; 430-other optical films; 50-liquid crystal panel.

Detailed Description

In order to make the technical solutions in the present specification better understood, the technical solutions in one or more embodiments of the present specification will be clearly and completely described below with reference to the accompanying drawings in one or more embodiments of the present specification, and it is obvious that the one or more embodiments described are only a part of the embodiments of the present specification, and not all embodiments. All other embodiments that can be derived by a person skilled in the art from one or more of the embodiments described herein without making any inventive step shall fall within the scope of protection of this document.

In the backlight module provided in the embodiment of the present description, the light processing element is disposed on the side surface of the diffuser plate in the optical film set, so that blue light emitted from the light emitting element onto the light processing element can be processed, blue light leakage at the edge of the display area and light brightness enhancement at the edge of the backlight module are reduced, light mixing uniformity of the backlight module is improved, and a phenomenon that the edge of the backlight module is bluing is improved. The backlight module and various parts thereof provided by the embodiments of the present specification will be described in detail below.

Example one

Referring to fig. 1 and 2, a backlight module provided for an embodiment of the present disclosure includes a substrate 10, a light emitting element, and an optical film group 40, which are sequentially stacked, where the optical film group 40 includes a diffuser plate 400, a light conversion film 410, and other optical films, and the diffuser plate 400, the light conversion film 410, and the other optical films are sequentially stacked above the light emitting element, where the diffuser plate 400 includes a light emitting surface and a light entering surface which are oppositely disposed, and a side surface disposed between the light emitting surface and the light entering surface, and the side surface is provided with a light processing element 420, which can process blue light emitted from the light emitting element to the side surface of the diffuser plate, such as converting the blue light into white light, absorbing the blue light, or reflecting the blue light into the light conversion film 410, so as to improve light mixing uniformity of the backlight module, and improve blue light emission at an edge portion of the backlight module.

The direct-type backlight module generally uses blue light emitting diodes as light sources, and blue light emitted from the blue light emitting diodes excites the light conversion film 410, such as a quantum dot film, to generate white light. However, the number of times of converting the blue light into the white light due to reflection or refraction of the light is small, and the blue light emitted from the light emitting assembly to the edge of the backlight module is not converted into the white light or is reflected back and forth by the rubber frame after being converted into the white light, so that a light leakage phenomenon or brightness enhancement occurs at the edge of the display area, and thus, light mixing imbalance occurs at the edge of the backlight module, which causes a color difference between the edge of the backlight module and the surrounding central area to occur at a high frequency.

The substrate referred to in this application is an iron frame or a plastic-iron integrated frame, the plastic-iron integrated frame is a plastic-iron integrated frame obtained by mounting a plastic frame on the iron frame, and the substrate 10 in fig. 1, 2, and 3 may be only an iron frame. In an actual product structure, after the optical film set including the diffusion plate is mounted on the substrate 10, the periphery of the optical film set is at a certain distance from the substrate to accommodate cold expansion and cold contraction of the optical film set in a cold-heat impact experiment, so that part of blue light emitted by the light emitting assembly is emitted from the edge of the diffusion plate, and this part of the blue light may include blue light which is not emitted through the quantum dot film, and also include a phenomenon that the edge of the quantum dot film fails due to the cut existing in the edge of the quantum dot film even though the blue light passes through the edge of the quantum dot film. The blue light is reflected back and forth in the rubber frame and finally emitted from the edge part of the display area. The light processing member disposed on the side surface of the diffusion plate in the backlight module provided in the embodiments of the present disclosure may process the blue light emitted onto the side surface of the diffusion plate, such as converting the blue light into white light, absorbing the blue light, or reflecting the blue light into the light conversion film 410. As shown in fig. 2, the light L that is not blocked by the light-blocking glue at the edge of the display panel 50 is irradiated on the liquid crystal panel 50, it can be seen that the display area of the display panel 50 is an area between the straight lines AA-BB, and the area from the straight line BB of the display panel 50 to the edge of the display panel does not receive the light emitted by the backlight module, which is a non-display area.

The light treatment member may be disposed on the side surface of the diffusion plate at a position where the light emitted from the light emitting element is irradiated to the side surface of the diffusion plate 400, or may be disposed on the side surface of the diffusion plate 400 so as to completely cover the light treatment member.

Referring to fig. 3 and 4, in some embodiments, in the backlight module provided in the embodiments of the present disclosure, the light processing member is configured in a film shape, the light processing member 420 covers the side surface, and the light processing member 420 is further disposed on the periphery of the light emitting surface of the diffusion plate 400.

In the backlight module provided in the embodiment of the present specification, the light processing member may be a film having a thickness of 0.05mm to 0.15mm, and the film-like light processing member may be covered on the side surface, or the diffusion plate 400 may be completely covered on the side surface. Thus, the diffusion plate 400 can be mounted in the backlight unit after the light treatment member in a film form is prepared on the diffusion plate 400, and the preparation process is simple, and the diffusion plate 400 can be directly mounted in the mounting process of the backlight unit.

In addition, the light processing member 420 is disposed at the periphery of the light emitting surface of the diffusion plate 400, and the length of the light processing member 420 extending from the light emitting surface of the diffusion plate 400 is 0.08mm to 1.2mm, so that blue light emitted from the light emitting device can be processed, for example, when light emitted from the light emitting device is emitted from the periphery of the light emitting surface of the diffusion plate 400, the light processing member 420 can convert the blue light into white light, thereby improving the conversion rate of converting blue light into white light and reducing the light leakage of the blue light.

In some embodiments, in the backlight module provided in the embodiments of the present disclosure, the light processing element 420 is further disposed at the periphery of the light incident surface of the diffusion plate 400.

In the backlight module provided in the embodiment of the present disclosure, the light processing element 420 is further disposed at the periphery of the light incident surface of the diffusion plate 400, so as to prevent blue light emitted by the light emitting element from being reflected or refracted and then being irradiated at the periphery of the light incident surface of the diffusion plate 400 and being directly refracted into the plastic frame, thereby reducing light leakage of the blue light.

In some embodiments, the light treatment member is a light conversion layer, and the light conversion layer converts at least blue light emitted from the light emitting element to the light conversion layer into white light. The light conversion layer can convert blue light into white light to be emitted out when the light conversion layer irradiates the light processing piece with the blue light emitted by the light emitting component at least, so that the light emitted by the light emitting component can be fully mixed at the edge part of the backlight module, and the light mixing uniformity is improved. The light conversion layer may be a film coated on the side surface of the diffusion plate 400, a film directly formed on the side surface of the diffusion plate 400, or a film coated on the side surface of the diffusion plate 400 during the subsequent assembly of the backlight module. The light conversion layer can be a film layer prepared from quantum dots or fluorescent particles, and can also be a film layer prepared from other kinds of materials as long as the function of converting blue light into white light is achieved. The light conversion layer may be a function of converting blue light into white light, and may also be a function of converting light of another color emitted by the light emitting assembly into another color, which is not limited herein as long as the conversion of the color of light is achieved. The light conversion member may be a laminated structure or other structural components, but is not limited thereto. The material of the light conversion layer is quantum dots or fluorescent particles, but other materials can perform only the function of light conversion.

In some embodiments, in the backlight module provided in the embodiments of the present disclosure, the light processing element 420 is a reflective layer, and the reflective layer reflects blue light emitted from the light emitting element to the reflective layer.

In some embodiments, in the backlight module provided in the embodiments of the present disclosure, the light processing member 420 may be a light reflecting layer, and the light emitting layer may be a thin film disposed on the side surface of the diffusion plate 400, for example, a light reflecting ink such as white oil formed integrally with the diffusion plate, and obtained by applying a light reflecting ink process, or a light reflecting layer disposed on a reflective strip wrapped on the side surface of the diffusion plate 400 to reflect light back to the diffusion plate 400, so that light is not emitted from the side surface of the diffusion plate 400.

In some embodiments, in the backlight module provided in the embodiments of the present disclosure, the light reflecting layer is provided with light conversion particles, and the light conversion particles are used for converting blue light emitted from the light emitting element to the light conversion particles into white light.

In the backlight unit that this specification embodiment provided, be provided with light conversion particle such as quantum dot or fluorescent particle in the reflector layer, for example the reflector layer can be reflection of light printing ink, and quantum dot or fluorescent particle can be in reflection of light printing ink, therefore quantum dot or fluorescent particle are in reflecting the diffuser plate with white light reflection again after converting blue light into white light, and the rethread light conversion membrane reflects away, and the effect is better.

The light conversion particles may be formed into a film-shaped light conversion layer provided on the side surface of the diffuser plate, and then the light reflection layer is provided on the light conversion layer, so that a layered structure of two films may be formed on the side surface of the diffuser plate 400.

In some embodiments, in the backlight module provided in the embodiments of the present disclosure, the light processing member 420 is a light absorbing layer for absorbing blue light emitted from the light emitting element to the light absorbing layer.

In the backlight module provided in the embodiment of the present disclosure, the light processing member 420 is a light absorbing layer, the light absorbing layer may be formed on the side surface, and the light absorbing layer may be a light shielding glue, black ink, or the like, and may absorb light emitted to the side surface of the diffusion plate 400, thereby reducing light emitted from the side surface of the diffusion plate. The light absorption layer can be prepared by adopting a preparation process such as coating and the like.

As shown in fig. 4, in some embodiments, the backlight module provided in this specification includes a substrate 10 including a bottom 100 and a sidewall 110 extending from a periphery of the bottom 100 in a direction perpendicular to the bottom 100, an inner groove 120 and a boss 130 are disposed on an inner surface of the sidewall 110, a light emitting device is disposed on the bottom 100, an optical film group 40 is disposed on the inner groove 120, and the boss 130 is used for mounting a display panel.

The substrate 10 in fig. 4 may be an iron frame. In the backlight module provided in the embodiment of the present description, a projection of the boss 130 on the bottom 100 is substantially the same as a projection of the inner groove 120 on the bottom 100, so that the boss 130 can function as a light shielding glue, and can also reduce an area of a non-display region of the display panel 50 at an edge (as shown in fig. 2 and 3), and increase a display area of the display panel 50, specifically as shown in fig. 5. The difference between the backlight module shown in fig. 5 and the backlight module shown in fig. 4 is that the substrate of the backlight module shown in fig. 4 is integrated, and the substrate of the backlight module shown in fig. 5 is assembled separately.

Referring to fig. 5, in some embodiments, the backlight module provided in this specification includes a side wall 110 including a base 111 and a connector 112, the base 111 is integrally formed with a bottom 100, the base 111 is provided with a first step portion 1110, the connector 112 is provided with a second step portion 1121, after the connector 112 is mounted on the base 111, a bottom surface 1120 of the second step portion 1121 forms an inner groove 120 with the first step portion 1110, the second step portion 1121 forms a boss 130, and a projection of the first step portion 1110 on the bottom 100 is substantially equal to a projection of the second step portion 1121 on the bottom 100.

The sidewall 110 includes a base 111 and a connector 112, the base 111 and the bottom 100 are integrally formed, and may be an iron frame, and a first step portion 1110 is disposed on the base 111 for mounting the optical film group 40. The connecting member 112 is a rubber frame, a second step portion 1121 is disposed on the connecting member 112, and after the connecting member 112 is mounted on the base 111, the display panel 50 is mounted on the second step portion 1121. The connector 112 and the base 111 are fixed by an adhesive.

As shown in fig. 5, the blue light emitted from the light emitting assembly 20 is converted into white light by the light processing member 420 at the edge of the diffusion plate 400 and then reflected to the display region of the display panel by the bezel, and the region between the straight line BB and the bezel of the display panel 50 in fig. 5 is a non-display region, and compared with the length reduction of the non-display region between the straight line BB and the edge of the display panel 50 in fig. 2, the display area of the display region of the display panel is significantly increased under the condition that the lengths of the display panels are the same.

Through above-mentioned technical scheme, the backlight unit that this application provided, including base plate, light-emitting component and the optical film group of superpose in order, light-emitting component includes light guide plate and lamp plate, is provided with the LED lamp on the lamp plate, and the light guide plate setting is in the top of lamp plate, and top in this is the direction towards the user when the user uses display terminal. The optical film group comprises a diffusion plate, a light conversion film and other optical films, the diffusion plate, the light conversion film and other optical films are sequentially stacked above the light-emitting assembly, the diffusion plate comprises a light-emitting surface and a light-entering surface which are oppositely arranged, and a side surface arranged between the light-emitting surface and the light-entering surface, the side surface is provided with a light processing piece, the light processing piece at least processes blue light emitted by the light-emitting assembly to the light processing piece, and the blue light is prevented from leaking, so that the light leakage of the blue light or the light brightness enhancement of the edge part of the backlight module can not be caused, the light chromatic aberration of other areas of the backlight module is reduced, the light mixing uniformity of the backlight module can be improved, and the phenomenon that the edge.

Example two

The embodiment of the present specification further provides a display module, which includes a display panel and the backlight module according to the foregoing. As shown in fig. 1 and fig. 2, the backlight module provided in the present specification includes a substrate 10, a light emitting element, and an optical film group 40 stacked in sequence, where the optical film group 40 includes a diffuser plate 400, a light conversion film 410, and other optical films, and the diffuser plate 400, the light conversion film 410, and other optical films are stacked above the light emitting element in sequence, where the diffuser plate 400 includes a light emitting surface and a light entering surface disposed opposite to each other, and a side surface disposed between the light emitting surface and the light entering surface, and a light processing element 420 is disposed on the side surface, and can process blue light emitted from the light emitting element to the side surface of the diffuser plate, such as converting the blue light into white light, absorbing the blue light, or reflecting the blue light into the light conversion film 410, so as to improve light mixing uniformity of the backlight module, and improve blue light emission at an edge portion of the backlight.

The substrate is a rubber-iron integrated frame, and the rubber-iron integrated frame is obtained by mounting a rubber frame on an iron frame. In an actual product structure, after the optical film set including the diffusion plate is mounted on the substrate 10, the periphery of the optical film set is at a certain distance from the substrate to accommodate cold expansion and cold contraction of the optical film set in a cold-heat impact experiment, so that part of blue light emitted by the light emitting assembly is emitted from the edge of the diffusion plate, and this part of the blue light may include blue light which is not emitted through the quantum dot film, and also include a phenomenon that the edge of the quantum dot film fails due to the cut existing in the edge of the quantum dot film even though the blue light passes through the edge of the quantum dot film. The blue light is reflected back and forth in the rubber frame and finally emitted from the edge part of the display area. The light processing member disposed on the side surface of the diffusion plate in the backlight module provided in the embodiments of the present disclosure may process the blue light emitted onto the side surface of the diffusion plate, such as converting the blue light into white light, absorbing the blue light, or reflecting the blue light into the light conversion film 410.

Through above-mentioned technical scheme, the backlight unit that this application provided, including base plate, light-emitting component and the optical film group of superpose in order, light-emitting component includes light guide plate and lamp plate, is provided with the LED lamp on the lamp plate, and the light guide plate setting is in the top of lamp plate, and top in this is the direction towards the user when the user uses display terminal. The optical film group comprises a diffusion plate, a light conversion film and other optical films, the diffusion plate, the light conversion film and other optical films are sequentially stacked above the light-emitting assembly, the diffusion plate comprises a light-emitting surface and a light-entering surface which are oppositely arranged, and a side surface arranged between the light-emitting surface and the light-entering surface, the side surface is provided with a light processing piece, the light processing piece at least processes blue light emitted by the light-emitting assembly to the light processing piece, the blue light is prevented from leaking, the light leakage of the blue light or the light brightness enhancement of the edge part of the backlight module is avoided, the light chromatic aberration of other areas of the backlight module is reduced, the light mixing uniformity of the backlight module can be improved, and the phenomenon that the edge part of the backlight.

EXAMPLE III

An embodiment of the present specification further provides a display device, including the display module according to the above. The display module provided by the embodiment of the specification comprises a display panel and the backlight module. Referring to fig. 1 and 2, a backlight module provided in an embodiment of the present disclosure includes a backlight module including a substrate 10, a light emitting device, and an optical film group 40, wherein the optical film group 40 includes a diffuser plate 400, a light conversion film 410, and other optical films, the diffuser plate 400, the light conversion film 410, and the other optical films are sequentially stacked above the light emitting device, wherein the diffusion plate 400 includes a light emitting surface and a light incident surface which are opposite to each other, and a side surface disposed between the light emitting surface and the light incident surface, on which a light processing member 420 is disposed, blue light emitted by the light emitting elements onto the side of the diffuser plate may be processed, such as to convert the blue light to white light, absorb the blue light, or reflect the blue light into the light conversion film 410, therefore, the light mixing uniformity of the backlight module is improved, and the phenomenon that the edge part of the backlight module emits blue light or the brightness of light is enhanced is improved.

In short, the above description is only a preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present specification shall be included in the protection scope of the present specification.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.

Claims

1. A backlight module is characterized by comprising a substrate, a light emitting assembly and an optical film group which are sequentially overlapped, wherein the optical film group comprises a diffusion plate, a light conversion film and other optical films, the diffusion plate, the light conversion film and the other optical films are sequentially overlapped above the light emitting assembly, the diffusion plate comprises a light emergent surface and a light incident surface which are oppositely arranged, and a side surface arranged between the light emergent surface and the light incident surface, and a light processing piece is arranged on the side surface.

2. The backlight module as claimed in claim 1, wherein the light treatment member is configured as a film, and the light treatment member is coated on the side surface.

3. The backlight module as claimed in claim 2, wherein the light processing member is further disposed at a periphery of the light emitting surface of the diffuser plate and/or a periphery of the light incident surface of the diffuser plate.

4. The backlight module as claimed in claim 2, wherein the light processing member is a light conversion layer for converting at least blue light emitted from the light emitting device to the light conversion layer into white light, or a light absorbing layer for absorbing the blue light emitted from the light emitting device to the light absorbing layer.

5. The backlight module of claim 2, wherein the light treatment member is a reflective layer, and the reflective layer reflects blue light emitted from the light emitting element to the reflective layer.

6. The backlight module as claimed in claim 5, wherein the light reflecting layer is provided with light conversion particles for converting blue light emitted from the light emitting elements to the light conversion particles into white light.

7. The backlight module according to any one of claims 1 to 6, wherein the substrate comprises a bottom and a sidewall extending from a periphery of the bottom in a direction perpendicular to the bottom, an inner groove and a boss are provided on an inner surface of the sidewall, the light emitting element is disposed on the bottom, the optical film group is disposed on the inner groove, and the boss is used for mounting a display panel.

8. The backlight module according to claim 7, wherein the side wall comprises a base and a connector, the base is integrally formed with the bottom, the base is provided with a first step portion, the connector is provided with a second step portion, a bottom surface of the second step portion and the first step portion form the inner groove, the second step portion is formed as the boss, and a projection of the first step portion on the bottom is substantially equal to a projection of the second step portion on the bottom.

9. A display module comprising a display panel and a backlight module according to any one of claims 1-8.

10. A display device, comprising the display module according to claim 9.