WO2019149082A1

WO2019149082A1 - Backlight module, display assembly, and electronic device

Info

Publication number: WO2019149082A1
Application number: PCT/CN2019/072189
Authority: WO
Inventors: 陆忠恒
Original assignee: Oppo广东移动通信有限公司
Priority date: 2018-01-31
Filing date: 2019-01-17
Publication date: 2019-08-08
Also published as: CN108287437A

Abstract

A backlight module (10), a display assembly, and an electronic device (90). The backlight module (10) comprises: an optical element (12) configured to emit light and process the light; a back frame (11), comprising a bottom wall (111) and side walls (112), the bottom wall (111) being connected to the side walls (112) in bent fashion, the bottom wall (111) and the side walls (112) enclosing to form an accommodating cavity, and the optical element (12) being provided in the accommodating cavity; and a plastic frame (13), provided on at least one side of the back frame (11), and comprising a limiting part (131) and light shielding parts (132), wherein the limiting part (131) is configured to limit the optical element (12), and the light shielding parts (132) extend from the two ends of the limiting part (131) toward the opposite ends and are configured to shield the light, leaked from the two ends of the limiting part (131), of the optical element (12).

Description

Backlight module, display assembly and electronic device

[Technical Field]

The present application relates to the field of backlighting of electronic devices, and in particular to a backlight module, a display assembly, and an electronic device.

【Background technique】

At present, with the development of science and technology, electronic devices such as smart phones are increasingly becoming a necessity for people's lives.

The backlight module is an important component of the electronic device. At present, the backlight module of the portable electronic device such as a smart phone usually adopts a side-in type backlight module, that is, the light emitted by the light source is incident on the light guide plate from the side of the light guide plate, and is guided by the light guide plate. After that, the display panel of the electronic device is provided with a backlight. However, since the light source of the side-entry backlight module and some related structures need to be disposed on the side of the light guide plate, a large non-display area is occupied, which is disadvantageous for narrowing. The realization of the border and the full screen, how to shorten the width of the backlight module in the non-display area without affecting the normal display of the backlight module and the display panel has become a focus of attention.

[Summary of the Invention]

In one aspect, the embodiment of the present application provides a backlight module, the backlight module includes: an optical component for emitting light and processing light; the back frame and the back frame include a bottom wall and a sidewall, a bottom wall and a sidewall a bending connection, the bottom wall and the side wall enclose a receiving cavity, the optical component is disposed in the accommodating cavity; the plastic frame is disposed on at least one side of the back frame, and includes a limiting portion and a light shielding portion, wherein The limiting portion is configured to limit the optical component, and the light shielding portion extends from opposite ends of the limiting portion to the opposite end, and the shielding portion is configured to block light leakage of the optical element from both ends of the limiting portion.

On the other hand, the embodiment of the present application further provides a display component, where the display component includes a display module and a backlight module for providing backlight for the display module; the backlight module includes:

Optical element for illuminating and processing light;

a back frame, the back frame includes a bottom wall and a side wall, the bottom wall is bent and connected to the side wall, the bottom wall and the side wall enclose an accommodating cavity, and the optical element is disposed in the accommodating cavity;

a plastic frame disposed on at least one side of the back frame, including a limiting portion and a light blocking portion, wherein the limiting portion is configured to limit the optical component, and the light shielding portion is from the limiting portion The two ends extend toward the opposite end, and the light shielding portion is configured to block light leakage of the optical element from both ends of the limiting portion.

Further, the present application further provides an electronic device including a rear case, a middle frame, and a display assembly; the middle frame is fixedly connected to the rear case, and the display component is fixed to the middle frame; The display module includes a display module and a backlight module for providing backlighting for the display module; the backlight module includes:

Optical element for illuminating and processing light;

[Description of the Drawings]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a schematic front view of a backlight module according to an embodiment of the present application;

2 is a cross-sectional structural view of the backlight module shown in FIG. 1 taken along the A-A direction;

3 is a partial enlarged structural view of the backlight module shown in FIG. 1 at the M position;

4 is a schematic structural view of a plastic frame and a back frame of the backlight module shown in FIG. 1;

FIG. 5 is a schematic structural diagram of another backlight module according to an embodiment of the present application; FIG.

6 is an enlarged schematic structural view of the backlight module shown in FIG. 5 at a P position;

FIG. 7 is a schematic exploded view of an electronic device according to an embodiment of the present application.

【Detailed ways】

The technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the accompanying drawings in the embodiments. It is understood that the specific embodiments described herein are merely illustrative of the application and are not intended to be limiting. In addition, it should be noted that, for the convenience of description, only some but not all of the structures related to the present application are shown in the drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

The terms "first", "second", and the like in this application are used to distinguish different objects, and are not intended to describe a particular order. Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products or equipment.

References to "an embodiment" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The appearances of the phrases in various places in the specification are not necessarily referring to the same embodiments, and are not exclusive or alternative embodiments that are mutually exclusive. Those skilled in the art will understand and implicitly understand that the embodiments described herein can be combined with other embodiments.

An embodiment of the present application provides a backlight module, where the backlight module includes:

Optical element for illuminating and processing light;

The backlight module includes a display area and a non-display area, and the optical component is configured to emit light, and the light is processed and outputted from the display area;

The limiting portion and the light shielding portion are located in the non-display area, and the limiting portion is disposed on a side of the optical element away from the display area;

The light shielding portion is disposed at a side of the limiting portion away from the optical element, and a thickness of the light shielding portion is greater than a thickness of the limiting portion.

The limiting portion includes a limiting body and a limiting sidewall, and the limiting sidewall is disposed at two ends of the limiting body and extends from the limiting body toward the optical component;

The light shielding portion extends from the intersection of the limiting sidewall adjacent to the limiting body to the other limiting sidewall.

The light shielding portion is disposed in parallel with the limit body.

The light shielding portion includes a first sub-shielding portion and a second sub-shielding portion, the first sub-shield portion is away from the limit from the intersection of the limiting sidewall and the limiting body The direction of the bit body extends, and the second sub-shield portion extends from the end of the first sub-shielding portion away from the limiting body toward the limiting body.

Wherein the optical component comprises a light guide plate, a light source and a light homogenizing element, wherein:

a light guide plate comprising a light incident surface and a light exit surface;

a light source disposed on one side of the light incident surface;

a light homogenizing element disposed on a light emitting surface of the light guide plate;

The limiting body is configured to limit the light source, and the limiting sidewall is used to limit the light guiding plate and the light homogenizing element.

Wherein, the light source is a plurality of, the limiting body comprises a plurality of spaced apart limiting blocks, and the light source is disposed between two adjacent ones of the limiting blocks.

The thickness of the limiting sidewall is greater than the thickness of the limiting body.

Wherein, a light absorbing material is further disposed on the sidewall of the light shielding portion to absorb the leaked light.

Another aspect of the present application provides a display component, where the display component includes a display module and a backlight module for providing backlight for the display module. The backlight module includes:

Optical element for illuminating and processing light;

The light shielding portion is disposed in parallel with the limit body.

a light source disposed on one side of the light incident surface;

An embodiment of the present application further provides an electronic device including a rear case, a middle frame, and a display component; the middle frame is fixedly connected to the rear case, and the display component is fixed to the middle frame; The display module includes a display module and a backlight module for providing backlighting to the display module; the backlight module includes:

Optical element for illuminating and processing light;

The electronic device further includes a cover plate, and the cover plate is disposed on the display module.

It should be noted that when a portable electronic device such as a smart phone pursues a narrow frame or a full screen, the width of the frame is extremely demanded, and thus the problem of light leakage at the edge of the whole machine is extremely likely to occur. The embodiments of the present application provide a solution for the backlight module and the electronic device to solve the above problem. For details, refer to the following embodiments provided by the present application:

1 and FIG. 2, FIG. 1 is a schematic front view of a backlight module according to an embodiment of the present disclosure, and FIG. 2 is a cross-sectional structural view of the backlight module of FIG. 1 taken along the A-A direction. As shown in FIG. 1 and FIG. 2, the backlight module 10 of the present embodiment includes a back frame 11, an optical component 12, and a plastic frame 13.

The back frame 11 is a box-shaped structure with an open side. The back frame 11 includes a bottom wall 111 and a side wall 112. The bottom wall 111 is bent and connected to the side wall 112. The bottom wall 111 and the side wall 112 enclose a receiving cavity. The material of the back frame 11 may be metal, for example, iron, aluminum, or the like, or may be plastic.

The optical element 12 is used to illuminate and process the light. The backlight module 10 includes a display area 100 and a non-display area 200. The optical element 12 is used for emitting light, and is processed from the display area 100 after processing the light.

The optical element 12 includes a light source 121, a reflective sheet 122, a light guide plate 123, and a light homogenizing element 124.

The reflective sheet 122 is disposed on the bottom wall 111 of the back frame 11 and is located inside the accommodating cavity. The reflection sheet 122 can reflect incident light.

The light guide plate 123 is disposed on the reflective sheet 122 and located inside the accommodating cavity. The light guide plate 123 includes a light incident end portion 1231 and a light guide plate main body portion 1232. The light incident end portion 1231 is provided with a light incident surface 1233, and the light guide plate main portion 1232 is provided with a light exit surface 1234. The thickness of the light incident end portion 1231 is greater than the thickness of the light guide plate main body 1232, and the thickness of the light incident end portion 1231 gradually decreases from the light incident surface 1233 to the direction away from the light incident surface 1233, and the thickness of the light guide plate main body portion 1232 is uniform, that is, the thickness everywhere. equal.

The light source 121 is disposed on the side of the light incident surface 1233 and is disposed on a region where the reflection sheet 122 is not covered by the light guide plate 123. Light source 121 can be an LED light.

The light homogenizing element 124 is disposed on the light emitting surface 1234 of the light guide plate 123.

The light emitted from the light source 121 is incident on the light incident end portion 1231 of the light guide plate 123 through the light incident surface 1233 of the light guide plate 123, and the light incident end portion 1231 guides the light into the light guide plate main body portion 1232 by the wedge structure, and the light guide plate main body portion The 1232 guide light is transmitted to the entire light guide plate main body portion 1232 and then transmitted to the light homogenizing element 124. The light homogenizing element 124 diffuses the incident light, condenses and brightens it, and the like as an output of the backlight module. The light leaking from the side of the light guide plate 123 away from the light exit surface 1234 will be reflected back into the light guide plate 123 by the reflective sheet 122.

It should be understood that the light output from the backlight module 10 will be displayed in the display area 100 to form a desired image. At present, in order to pursue a high screen ratio, that is, a wide screen or even a full screen design, an extremely demanding limitation is imposed on the design width of the non-display area 200, and the design of the narrow bezel easily causes the light leakage in the non-display area 200. For example, as shown in FIG. 1 , the backlight module 10 has a rectangular structure, and the backlight module 10 is divided into a Y direction corresponding to a long side thereof and an X direction corresponding to a short side thereof, wherein the X direction is an arrangement direction of the light source 121 . . The design of the narrow bezel will limit the borders in the X and Y directions, which will easily lead to light leakage in the X and Y directions. In the case where light is leaked in the X direction, the light leakage position as shown in FIG. 1 can be used. For the light leakage in the X direction, in the embodiment, a light shielding portion is provided on the plastic frame 13 to avoid the problem of light leakage.

Specifically, please refer to FIG. 3 and FIG. 4 together. FIG. 3 is a partial enlarged structural view of the backlight module shown in FIG. 1 at the M position, and FIG. 4 is a plastic frame and back of the backlight module shown in FIG. Schematic diagram of the frame fit. The plastic frame 13 is disposed on at least one side of the Y frame of the back frame 11. As shown in FIG. 1, the plastic frame 13 is disposed on a side of the back frame 11 where the light source 121 is disposed. It should be noted that the plastic frame 13 can be further disposed on a side of the back frame 11 away from the light source 121. The plastic frame 13 includes a limiting portion 131 and a light blocking portion 132 , and the limiting portion 131 and the light blocking portion 132 are located in the non-display region 200 .

The limiting portion 131 is for limiting the optical element 12. The limiting portion 131 is disposed on a side of the optical element 12 away from the display area 100. The limiting portion 131 includes a limiting body 1311 and a limiting sidewall 1312 . The limiting sidewall 1312 is disposed at two ends of the limiting body 1311 and extends from the limiting body 1311 toward the optical element 12 . As shown in FIG. 4 , the limiting sidewall 1312 extends obliquely from the limiting body 1311 toward the optical element 12 . The two limiting sidewalls 1312 extend in opposite directions, and the two limiting sidewalls 1312 are equal to the limiting body 1311 and form an obtuse angle with the limiting body 1311.

The limit body 1311 is used to limit the light source 121. Specifically, there are a plurality of light sources 121, as shown in FIG. The limiting body 1311 includes a plurality of spaced apart limiting blocks 1313, and the light source 121 is disposed between the adjacent two limiting blocks 1313. It should be understood that considering the assembly error of the light source 121 and the thermal deformation of the light source 121 to a certain extent, the width between two adjacent limiting blocks 1313 should be greater than the width of the light source 121.

The limiting sidewall 1312 is used to limit the light guide plate 123 and the light homogenizing element 124. Further, the reflection sheet 122 may be limited. As shown in FIG. 2, the light source 121 is disposed opposite to and in parallel with the light guide plate 123, and the light homogenizing element 124 is disposed on the light guide plate 123. Therefore, the light homogenizing element 14 is convex with respect to the light source 12. In order to better position the light guide plate 123 and the light homogenizing element 124, the thickness of the limiting sidewall 1312 is greater than the thickness of the limiting body 1311, so that the limiting sidewall 1312 is flush with the surface of the light homogenizing element 124. Or slightly convex than the surface of the light homogenizing element 124.

Similarly, considering the assembly error and a certain degree of thermal deformation during operation, a gap b can be reserved between the limiting sidewall 1312 and the light guide plate 123 and the light homogenizing element 124, as shown in FIG.

In the design of the narrow bezel, the light leaking from the side of the light guide plate 123 and the light homogenizing element 124 near the limiting side wall 1312 leaks along the gap b. Further, the light source 121 near the limiting sidewall 1312 can also generate light emitted to the limiting sidewall 1312, and the light reflected from the reflective sheet 122 back to the light guide plate 123, and the reflection direction thereof can also include the limiting sidewall 1312. direction. Thereby, light leakage in the X direction is generated.

The present application provides a light blocking portion 132 for the light leakage phenomenon described above.

The light blocking portion 132 is disposed on a side of the limiting portion 131 away from the optical element 12 , and the light blocking portion 132 is configured to block light leaking from the optical device 11 from both ends of the limiting portion 131 . Specifically, the light shielding portion 132 extends from both ends of the limiting portion 131 to the opposite end, as shown in FIG. 1 . Specifically, the light shielding portion 132 extends from the intersection of the limiting side wall 1312 and the limiting body 1311 which are adjacent to the other limiting side wall 1312. The extending direction is the same as the extending direction of the limiting body 1311, that is, the light shielding portion 132 is disposed in parallel with the limiting body 1311, that is, the light shielding portion 132 is disposed at an obtuse angle with the limiting sidewall 1312. Similarly, in consideration of assembly error and a certain degree of thermal deformation during operation, a gap c may be reserved between the light shielding plate 132 and the light source 121, the light guide plate 123, the light homogenizing element 124, and the like, as shown in FIG. The gap b and the gap c communicate, whereby light leaking into the gap b will be transmitted into the gap c along the gap b. Since the light shielding portion 132 is disposed on the side of the limiting portion 131 away from the optical element 12 and disposed in parallel with the limiting body 1311, it is disposed at an obtuse angle with the limiting sidewall 1312. Therefore, the light shielding portion 132 will change from the limiting sidewall 1312. The light path of the leaked light is changed to be parallel with the limit body 1311 to block it from leaking from the limit side wall 1312. Light parallel to the limit body 1311 will eventually be covered by the display panel on the backlight module. The thickness of the light shielding portion 132 may be greater than the thickness of the limiting portion 131, and more specifically may be greater than the thickness of the limiting sidewall 1312. Thereby, a boss structure can be formed with respect to the limiting portion 131. The thickness of the light shielding portion 132 may also be equal to the thickness of the limiting side wall 1312.

Further, a light absorbing material may be further disposed on the sidewall of the light shielding portion 132 to absorb the leaked light. The light absorbing material may be a black ink which may be formed by a spray coating process or a screen printing process.

The light leakage phenomenon of the backlight module in the X direction is prevented by providing the light shielding portion 132. The light leakage phenomenon of the backlight module 10 in the Y direction is prevented by providing a light shielding layer.

Referring to FIG. 2 again, the backlight module 10 further includes a flexible circuit board 17 and a connecting tape 18. The light source 121 is electrically connected to the flexible circuit board 17. The line on the flexible circuit board 17 is connected to the light source 121 and an external power supply pin to supply power to the light source 121.

The flexible circuit board 17 is connected by a connection tape 18 to a region where the light guide plate 123 is not covered by the light homogenizing element 124. The attachment tape 18 can be a double sided tape. One surface of the double-sided tape is bonded to the lower surface of the corresponding position of the flexible circuit board 17, and the other surface is bonded to the upper surface of the corresponding position of the light guide plate 123.

The flexible circuit board 17 has a reserved gap a between the connecting tape 18 and the light homogenizing element 124. The reserved gap a is used to match the assembly error on the one hand, and the backlight module can still be used normally under a certain degree of thermal deformation.

In the present application, a light shielding layer 14 is disposed on an end surface of the light homogenizing element 124 adjacent to the flexible circuit board 17 and the connection tape 18 for blocking light leaking from the gap a.

Please refer to FIG. 5 and FIG. 6. FIG. 5 is a schematic structural diagram of another backlight module according to an embodiment of the present disclosure. FIG. 6 is an enlarged schematic structural view of the backlight module shown in FIG. The backlight module 50 of the present embodiment is different from the backlight module 10 of the previous embodiment in that the light blocking portion 532 of the backlight module 50 of the present embodiment is not disposed in parallel with the limiting portion 531.

Specifically, the limiting portion 531 is used to limit the optical element 52. The limiting portion 531 is disposed on a side of the optical element 52 away from the display area 100. The limiting portion 531 includes a limiting body 5311 and a limiting sidewall 5312. The limiting sidewall 5312 is disposed at both ends of the limiting body 5311 and extends from the limiting body 5311 toward the optical element 12. As shown in FIG. 6 , the limiting sidewall 5312 extends obliquely from the limiting body 5311 toward the optical element 52 . The two limiting side walls 5312 extend in opposite directions, and the two limiting side walls 5312 are equal to the limiting body 5311, and both form an obtuse angle with the limiting body 5311.

The limit body 5311 is used to limit the light source 521. The structure of the specific limit is as described above, and will not be described here.

The limiting sidewalls 5312 are used to limit the light guide plate and the light homogenizing element. Further, the reflective sheet can also be limited. As described above, the light source is disposed opposite to and parallel to the light guide plate, and the light homogenizing element is disposed on the light guide plate. Therefore, the light homogenizing element is protruded with respect to the light source. In order to better position the light guide plate and the light homogenizing component, the thickness of the limiting sidewall 5312 is greater than the thickness of the limiting body 5311, so that the limiting sidewall 5312 is flush with the surface of the light homogenizing component, or evenly The surface of the light element is slightly convex.

Similarly, considering the assembly error and a certain degree of thermal deformation during operation, a gap d can be reserved between the limiting sidewall 5312 and the light guide plate and the light homogenizing element, as shown in FIG.

In the design of the narrow bezel, light leaking from the side of the light guide plate and the light homogenizing element near the limiting side wall 5312 leaks along the gap d. Further, the light source near the limiting sidewall 5312 can also generate light emitted to the limiting sidewall 5312, and the light reflected from the reflective sheet back to the light guide plate, and the direction of reflection can also include the direction toward the limiting sidewall 5312. Thereby, light leakage in the X direction as shown in FIG. 1 is generated.

The present application provides a light blocking portion 532 for the light leakage phenomenon described above.

The light blocking portion 532 is disposed on a side of the limiting portion 531 away from the optical element 52, and the light blocking portion 532 is configured to block light leaking from the optical device 52 from both ends of the limiting portion 531. Specifically, the light shielding portion 532 extends from both ends of the limiting portion 531 to the opposite end, as shown in FIG. 5 . Specifically, the light shielding portion 532 extends from the intersection of the limiting side wall 5312 and the limiting body 5311 which are adjacent to the other limiting side wall 5312. And the extending direction is different from the extending direction of the limiting body 5311. As shown in FIG. 6, the light shielding portion 532 includes a first sub-shielding portion 5321 and a second sub-shielding portion 5322. The first sub-shielding portion 5321 extends away from the limiting body 5311 from the intersection of the limiting side wall 5312 and the limiting body 5311, and the second sub-shielding portion 5322 is away from the limiting body from the first sub-shielding portion 5321. One end of the 5311 extends in the direction of the limiting body 5311. Thereby forming a structure similar to a V-shape. A gap e is formed between the V-shaped structure and the limiting body 5311. The gap d is in communication with the gap e, whereby light leaking into the gap d will be transmitted into the gap e along the gap d. Since the light shielding portion 532 is disposed on a side of the limiting portion 531 away from the optical element 52, and a V-shaped structure is formed, the first sub-shielding portion 5321 can be parallel to the limiting side wall 5312, and the second sub-shielding portion 5322 and The first sub-shielding portion 5321 is disposed at an obtuse angle or an acute angle. Therefore, the light shielding portion 532 changes the optical path of the light leaking from the limit side wall 5312, and changes it to the direction of the limit body 5311 to block it from leaking from the limit side wall 5312. The light in the direction of the limit body 5311 will eventually be covered by the display panel on the backlight module. The thickness of the light shielding portion 532 may be greater than the thickness of the limiting portion 531, and more specifically may be greater than the thickness of the limiting sidewall 5312. Thereby, a boss structure can be formed with respect to the limiting portion 531. The thickness of the light shielding portion 132 may also be equal to the thickness of the limiting side wall 1312.

Please refer to FIG. 7. FIG. 7 is a schematic exploded view of an electronic device according to an embodiment of the present application. In this embodiment, the electronic device 90 may be a smart phone. In other embodiments, the electronic device may also be a tablet computer, a palmtop computer, a smart watch, or the like.

In the embodiment, the electronic device 90 includes a rear case 91, a middle frame 92, a backlight module 93, a display module 94, and a cover plate 95.

The middle frame 92 is fixedly coupled to the rear case 91.

The display module 94 is stacked on the backlight module 93, and the display module 94 and the backlight module 93 are both fixed to the middle frame 92.

The backlight module 93 is used to provide backlighting for the display module 94. The display module 94 and the backlight module 93 constitute a display assembly.

The display module 94 can be a liquid crystal display panel or other display panel.

The cover plate 95 is mounted on the display module 94. The cover plate 95 can be a clear glass cover, and the cover plate 95 can be opaque in the non-display area. For example, the cover plate 95 is coated with a light-shielding ink in the non-display area.

It should be understood that other structures of the electronic device, such as a circuit board or the like, may be disposed between the rear case 91 and the middle frame 92. Since the present application does not relate to improvements to these components, it will not be specifically described herein.

In other embodiments, the electronic device 90 can also adopt other structures. The description of the structure of the electronic device 90 does not limit the scope of the present application.

The above description is only the embodiment of the present application, and thus does not limit the scope of the patent application, and the equivalent structure or equivalent process transformation of the specification and the drawings of the present application, or directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of this application.

Claims

A backlight module, wherein the backlight module comprises:

Optical element for illuminating and processing light;

a back frame, the back frame includes a bottom wall and a side wall, the bottom wall is bent and connected to the side wall, the bottom wall and the side wall enclose an accommodating cavity, and the optical element is disposed in the accommodating cavity;

a plastic frame disposed on at least one side of the back frame, including a limiting portion and a light blocking portion, wherein the limiting portion is configured to limit the optical component, and the light shielding portion is from the limiting portion The two ends extend toward the opposite end, and the light shielding portion is configured to block light leakage of the optical element from both ends of the limiting portion.
The backlight module according to claim 1, wherein

The backlight module includes a display area and a non-display area, the optical component is configured to emit light, and the light is processed and outputted from the display area;

The limiting portion and the light shielding portion are located in the non-display area, and the limiting portion is disposed on a side of the optical element away from the display area;

The light shielding portion is disposed at a side of the limiting portion away from the optical element, and a thickness of the light shielding portion is greater than a thickness of the limiting portion.
The backlight module of claim 2, wherein the limiting portion comprises a limiting body and a limiting sidewall, and the limiting sidewall is disposed at two ends of the limiting body The limiting body extends toward the optical element;

The light shielding portion extends from the intersection of the limiting sidewall adjacent to the limiting body to the other limiting sidewall.
The backlight module according to claim 3, wherein the light shielding portion is disposed in parallel with the limit body.
The backlight module of claim 3, wherein the light shielding portion comprises a first sub-shielding portion and a second sub-shielding portion, the first sub-shielding portion is adjacent to the limiting sidewall The intersection of the limiting body extends away from the limiting body, and the second sub-shielding portion is away from the end of the first sub-shielding portion away from the limiting body toward the limiting body. extend.
The backlight module of claim 3, wherein the optical component comprises a light guide plate, a light source, and a light homogenizing element, wherein:

a light guide plate comprising a light incident surface and a light exit surface;

a light source disposed on one side of the light incident surface;

a light homogenizing element disposed on a light emitting surface of the light guide plate;

The limiting body is configured to limit the light source, and the limiting sidewall is used to limit the light guiding plate and the light homogenizing element.
The backlight module according to claim 6, wherein the light source is a plurality of, the limiting body comprises a plurality of spaced apart limiting blocks, and the light source is disposed in two adjacent limiting blocks. between.
The backlight module of claim 3, wherein the thickness of the limiting sidewall is greater than the thickness of the limiting body.
The backlight module according to claim 1, wherein a light absorbing material is further disposed on a sidewall of the light shielding portion to absorb the leaked light.
A display module, comprising: a display module and a backlight module for providing backlighting for the display module; the backlight module comprises:

Optical element for illuminating and processing light;

a back frame, the back frame includes a bottom wall and a side wall, the bottom wall is bent and connected to the side wall, the bottom wall and the side wall enclose an accommodating cavity, and the optical element is disposed in the accommodating cavity;

a plastic frame disposed on at least one side of the back frame, including a limiting portion and a light blocking portion, wherein the limiting portion is configured to limit the optical component, and the light shielding portion is from the limiting portion The two ends extend toward the opposite end, and the light shielding portion is configured to block light leakage of the optical element from both ends of the limiting portion.
The display assembly of claim 10 wherein:

The backlight module includes a display area and a non-display area, the optical component is configured to emit light, and the light is processed and outputted from the display area;

The limiting portion and the light shielding portion are located in the non-display area, and the limiting portion is disposed on a side of the optical element away from the display area;

The light shielding portion is disposed at a side of the limiting portion away from the optical element, and a thickness of the light shielding portion is greater than a thickness of the limiting portion.
The display assembly of claim 11 , wherein the limiting portion comprises a limiting body and a limiting sidewall, the limiting sidewall being disposed at both ends of the limiting body, and The limiting body extends toward the optical element;

The light shielding portion extends from the intersection of the limiting sidewall adjacent to the limiting body to the other limiting sidewall.
The display module according to claim 12, wherein the light shielding portion is disposed in parallel with the limit body.
The display assembly according to claim 12, wherein the light shielding portion comprises a first sub-shielding portion and a second sub-shielding portion, the limiting side wall and the first sub-shielding portion from the proximity thereof The intersection of the limiting body extends away from the limiting body, and the second sub-shielding portion extends from the end of the first sub-shielding portion away from the limiting body toward the limiting body. .
The display assembly of claim 12 wherein said optical component comprises a light guide, a light source, and a light homogenizing element, wherein:

a light guide plate comprising a light incident surface and a light exit surface;

a light source disposed on one side of the light incident surface;

a light homogenizing element disposed on a light emitting surface of the light guide plate;

The limiting body is configured to limit the light source, and the limiting sidewall is used to limit the light guiding plate and the light homogenizing element.
The display assembly according to claim 15, wherein the light source is a plurality of, the limiting body comprises a plurality of spaced apart limiting blocks, and the light source is disposed in two adjacent ones of the limiting blocks. between.
The display assembly of claim 12, wherein the thickness of the limiting sidewall is greater than the thickness of the limiting body.
The display module according to claim 10, wherein a light absorbing material is further disposed on a sidewall of the light shielding portion to absorb the leaked light.
An electronic device, comprising: a rear case, a middle frame, and a display assembly; the middle frame is fixedly connected to the rear case, the display component is fixed to the middle frame; and the display component A display module and a backlight module for providing backlighting to the display module; the backlight module includes:

Optical element for illuminating and processing light;

a back frame, the back frame includes a bottom wall and a side wall, the bottom wall is bent and connected to the side wall, the bottom wall and the side wall enclose an accommodating cavity, and the optical element is disposed in the accommodating cavity;

a plastic frame disposed on at least one side of the back frame, including a limiting portion and a light blocking portion, wherein the limiting portion is configured to limit the optical component, and the light shielding portion is from the limiting portion The two ends extend toward the opposite end, and the light shielding portion is configured to block light leakage of the optical element from both ends of the limiting portion.
The electronic device according to claim 19, wherein the electronic device further comprises a cover, and the cover is disposed on the display module.