CN108150896B

CN108150896B - Electronic device and backlight module thereof

Info

Publication number: CN108150896B
Application number: CN201810106191.8A
Authority: CN
Inventors: 陆忠恒
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-01-31
Filing date: 2018-01-31
Publication date: 2021-01-15
Anticipated expiration: 2038-01-31
Also published as: CN108150896A

Abstract

The application discloses backlight unit, this backlight unit includes: the light guide plate comprises a light inlet end part and a light guide plate main body part; the light source is arranged on one side of the light inlet end part, which is deviated from the main body part of the light guide plate; the light homogenizing assembly comprises a diffusion film, a first brightness enhancement film and a second brightness enhancement film which are sequentially stacked on the main body part of the light guide plate along the direction far away from the light guide plate; and the shading layer is arranged between the diffusion film and the first brightness enhancement film, and the covering area of the shading layer corresponds to the end area of one end, close to the light source, of the diffusion film or the first brightness enhancement film. The application also discloses an electronic device. In this way, the backlight module can be prevented from leaking light under the condition that the width occupied by the non-display area of the backlight module is reduced.

Description

Electronic device and backlight module thereof

Technical Field

The present invention relates to a backlight module of an electronic device, and more particularly, to a backlight module of an electronic device.

Background

At present, with the development of science and technology, electronic devices such as smart phones and the like are gradually becoming necessities of life of people.

Backlight unit is electron device's important part, portable electron device's such as smart mobile phone backlight unit of side income formula is adopted usually at present, the light that the light source sent penetrates into the light guide plate from the light guide plate side, thereby provide backlight for electron device's display panel through the light guide plate, however because this kind of side income formula backlight unit's light source and some relevant structures need set up the side at the light guide plate, consequently, occupy great non-display area, be unfavorable for the realization of narrow frame and comprehensive screen, how to shorten backlight unit in the width of non-display area and not influence backlight unit and display panel's normal demonstration, become the focus problem that people paid attention to.

Content of application

The embodiment of the application adopts a technical scheme that: provided is a backlight module including: the light guide plate comprises a light inlet end part and a light guide plate main body part; the light source is arranged on one side of the light inlet end part, which is deviated from the main body part of the light guide plate; the light homogenizing assembly comprises a diffusion film, a first brightness enhancement film and a second brightness enhancement film which are sequentially stacked on the main body part of the light guide plate along the direction far away from the light guide plate; and the shading layer is arranged between the diffusion film and the first brightness enhancement film, and the covering area of the shading layer corresponds to the end area of one end, close to the light source, of the diffusion film or the first brightness enhancement film.

Another technical scheme adopted by the embodiment of the application is as follows: an electronic device is provided, which includes the backlight module.

The beneficial effects of the embodiment of the application are that: the embodiment of this application includes through setting up backlight unit: the light guide plate comprises a light inlet end part and a light guide plate main body part; the light source is arranged on one side of the light inlet end part, which is deviated from the main body part of the light guide plate; the light homogenizing assembly comprises a diffusion film, a first brightness enhancement film and a second brightness enhancement film which are sequentially stacked on the main body part of the light guide plate along the direction far away from the light guide plate; the light shield layer, the setting is between diffusion barrier and first membrane that adds lustre to, and the coverage area of light shield layer is close to the tip region of the one end of light source corresponding to diffusion barrier or first membrane that adds lustre to make backlight unit need not set up in addition and occupy the light shielding structure of non-display area width alone, the light shield layer overlaps with first membrane that adds lustre to or diffusion barrier part, can be under the condition of the width that the non-display area that reduces backlight unit occupies, avoid backlight unit the light leak to appear.

Drawings

Fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application;

FIG. 2 is a schematic view illustrating a light shielding layer of a backlight module according to a first embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a backlight module in which a light-shielding layer is implemented by using a reflective layer according to another embodiment of the present disclosure;

FIG. 4 is a schematic view of the shading principle in the embodiment of FIG. 3;

FIG. 5 is a schematic view of another structure of a reflective layer according to an embodiment of the present application;

FIG. 6 is a schematic front view showing the diffusion film and the second brightness enhancement film of the backlight module according to the first embodiment of the present application;

FIG. 7 is a schematic front view of a diffusion film and a second brightness enhancement film of a backlight module according to a second embodiment of the present application;

FIG. 8 is a cross-sectional view of a backlight module according to a second embodiment of the present application, passing through a diffuser film connecting portion and a brightness enhancement film connecting portion;

fig. 9 is an exploded schematic view of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application. In the present embodiment, the backlight module includes a back frame 11, a reflective sheet 12, a light guide plate 13, a light homogenizing assembly 60, a light shielding layer 17, a flexible circuit board 18, a connection tape 19, a light shielding tape 20, a first plastic frame 21, a second plastic frame 22, and a light source 23.

The back frame 11 is a box-shaped structure with an opening on one side, the back frame 11 includes a bottom wall 111 and a side wall 112, the bottom wall 111 is connected with the side wall 112 in a bending manner, and the bottom wall 111 and the side wall 112 enclose an accommodating cavity. The material of the back frame 11 may be metal, such as iron, aluminum, etc.

The reflective sheet 12 is disposed on the bottom wall 111 of the back frame 11 and located inside the accommodating cavity.

The light guide plate 13 is disposed on the reflective sheet 12 and located inside the accommodating cavity.

The light guide plate 13 includes a light incident end portion 131 and a light guide plate main body portion 132, and the light incident end portion 131 of the light guide plate 13 near the light incident side thereof is thicker than the light guide plate main body portion 132.

Alternatively, the thickness of the light entrance end portion 131 gradually decreases from the light entrance side to a direction away from the light entrance side, and the thickness of the light guide plate main body portion 132 is uniform, i.e., equal everywhere.

The light source 23 is disposed on the area of the reflective sheet 12 not covered by the light guide plate 13, and the light source 23 is located at the side of the light guide plate 13. The light source 23 is located on the light incident side of the light guide plate 13. The light source 23 may be an LED lamp. The light source 23 is disposed on a side (e.g., the left side in fig. 1) of the light entrance end portion 131 facing away from the light guide plate main body portion 132.

The light uniformizing assembly 60 includes a diffusion film 14, a first brightness enhancement film 15, and a second brightness enhancement film 16.

The diffusion film 14, the first brightness enhancement film 15, and the second brightness enhancement film 16 are sequentially stacked on the light guide plate 13 in a direction away from the light guide plate 13. For example, as shown in fig. 1, the diffusion film 14, the first brightness enhancement film 15, and the second brightness enhancement film 16 are sequentially stacked on the light output surface of the light guide plate 13 from bottom to top.

The light emitting surface of the light guide plate 13 is a surface of the light guide plate 13 away from the reflective sheet 12. For example, as shown in fig. 1, the light exit surface of the light guide plate 13 is the upper surface of the light guide plate 13.

The first brightness enhancement film 15 may also be referred to as a lower brightness enhancement film, and the second brightness enhancement film 16 may also be referred to as an upper brightness enhancement film.

The first rubber frame 21 is disposed on the bottom wall 111 of the back frame 11 and is abutted against the side wall 112 of the back frame 11. The first plastic frame 21 is disposed on a side of the light source 23 away from the light guide plate 13, for example, the first plastic frame 21 is disposed on a left side of the light source 23, and a light mixing and heat dissipating space is left between the first plastic frame 21 and the light source 23.

The flexible circuit board 18 is partially disposed on an area of the light guide plate 13 not covered by the light unifying assembly 60, and a portion of the flexible circuit board 18 not disposed on the light guide plate 13 is disposed above the first glue frame 21 and the light source 23.

The light source 23 is fixed to the lower surface of the portion of the flexible circuit board 18 not disposed on the light guide plate 13, and the light source 23 is electrically connected to the flexible circuit board 18. The wiring on the flexible circuit board 18 connects the light source 23 and the external power pins to enable the external power pins to power the light source 23.

The flexible circuit board 18 is bonded to the area of the light guide plate 13 not covered by the light unifying assembly 60 by the connection tape 19. The connecting tape 19 may be a double-sided tape. One surface of the double-sided tape is attached to the lower surface of the flexible circuit board 18 at a position corresponding thereto, and the other surface thereof is attached to the upper surface of the light guide plate 13 at a position corresponding thereto.

A reserved gap a is reserved between the end part of the flexible circuit board 18 close to the diffusion film 14 and the end part of the dodging assembly 60 close to the flexible circuit board 18. The reserved gap a is used for matching assembly errors on one hand, and on the other hand, the backlight module can still be normally used under the condition of certain cold and hot deformation.

In one embodiment, the connection tape 19 extends toward the diffusion film 14, the connection tape 19 extends beyond one end of the flexible circuit board 18 close to the diffusion film 14, that is, the right end of the connection tape 19 extends beyond the right end of the flexible circuit board 18, the connection tape 19 is further attached to the upper surface of the light guide plate 13 in the area where the reserved gap a is located, and the connection tape 19 may be made of a light shielding material.

The light shielding tape 20 is disposed on the flexible circuit board 18 and on a partial area of the second brightness enhancement film 16.

The light shielding layer 17 is completely covered by the light shielding tape 20 in a vertical projection on the light shielding tape 20.

Alternatively, the light shielding tape 20 may include a first sub light shielding tape portion 201 and a second sub light shielding tape portion 202, the first sub light shielding tape portion 201 covers the flexible circuit board 18, and the second sub light shielding tape portion 202 covers the second brightness enhancement film 16. The thickness of the first sub light shielding tape part 201 may be greater than that of the second sub light shielding tape part 202.

The second glue frame 22 fixes the light shielding tape 20 and the flexible circuit board 18 on the side (the left side in the drawing) of the light shielding tape 20 and the flexible circuit board 18 away from the second bright enhancement film 16.

The first rubber frame 21 is located in the accommodating cavity of the back frame 11, and the second rubber frame 22 is located outside the accommodating cavity of the back frame 11.

The light shielding layer 17 is provided between the diffusion film 14 and the first brightness enhancement film 15, and the coverage area of the light shielding layer 17 corresponds to the end area of one end of the diffusion film 14 or the first brightness enhancement film 15 near the light source 23.

Alternatively, in the present embodiment, the light shielding layer 17 is provided on the upper surface of the diffusion film 14, and the light shielding layer 17 covers an area corresponding to the end area of the left end of the first brightness enhancement film 15. In other embodiments, the light shielding layer 17 may be disposed on the lower surface of the first brightness enhancement film 15, and the coverage area of the light shielding layer 17 may correspond to the end area of the left end of the first brightness enhancement film 15.

Optionally, the width of the end region covered by the light-shielding layer 17 is smaller than the width of the second light-shielding tape part 202.

Alternatively, the width of the end region may be 0.1mm-1.2mm, in particular the width of the end region may be 0.1mm, 0.05mm or 1.2 mm. In other words, the width of the light shielding layer 17 may be 0.1mm to 1.2mm, and specifically, the width of the light shielding layer 17 may be 0.1mm, 0.05mm, or 1.2 mm.

The light-shielding layer 17 is made of a light-shielding material.

Alternatively, the light shielding layer 17 may be a black ink layer formed on the upper surface of the diffusion film 14 or the lower surface of the first brightness enhancement film 15 by a printing process. The printing process may be a screen printing process. In other embodiments, the light shielding layer 17 may be a black ink layer formed on the upper surface of the diffusion film 14 or the lower surface of the first brightness enhancement film 15 by spraying. It should be understood that the light shielding layer 17 may be formed on the upper surface of the diffusion film 14 or the lower surface of the first brightness enhancement film 15 by other processes, which are not limited in this embodiment.

Alternatively, the first brightness enhancement film 15 and the second brightness enhancement film 16 may be provided as an integral film layer, which is a separate film layer from the diffusion film 14. In other words, the first brightness enhancement film 15 and the second brightness enhancement film 16 may be a composite film structure. Of course, the diffusion film 14, the first brightness enhancement film 15, and the second brightness enhancement film 16 may be independent films, which is not limited in the embodiment of the present invention.

Referring to fig. 2, fig. 2 is a schematic view illustrating a light shielding principle of a light shielding layer of a backlight module according to a first embodiment of the present application.

As shown in fig. 2, the light ray S1 originally leaked from the light source 23 through the reserved gap a directly can be shielded by the light shielding layer 17 and will not directly exit the backlight module, so as to avoid directly entering human eyes. The light shielding layer 17 does not occupy a separate width space in the width direction, and thus, the width of the non-display area of the backlight module can be reduced. Here, the non-display area refers to an area covered by the light-shielding tape 20, and the display area refers to an area not covered by the light-shielding tape 20.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a backlight module in which a light-shielding layer is implemented by using a reflective layer according to another embodiment of the present disclosure. The difference from the above embodiment is that the light shielding layer is a reflective layer 70.

The reflective surface of the reflective layer 70 faces the light guide plate 13, and the reflective layer 70 is used to reflect light, which is directed to the reflective layer 70 by the light source 23, back to the light guide plate 13.

Alternatively, the reflective layer 70 may include a transparent film layer 71 adjacent to the diffusion film 14 and a silver plated layer 72 adjacent to the first brightness enhancement film 15. The transparent thin film layer 71 may be adhered to a surface of the diffusion film 14 away from the light guide plate 13 (e.g., an upper surface of the diffusion film 14 in fig. 1), and the silver plating layer 72 may be plated on a surface of the transparent thin film layer 71 away from the light guide plate 13 (e.g., an upper surface of the transparent thin film layer 71 in fig. 3).

In other embodiments, the reflective layer 70 may not include a transparent thin film layer, and the reflective layer may also be a silver-plated layer disposed on the surface of the first brightness enhancement film 15 near the diffusion film 14 (e.g., the lower surface of the first brightness enhancement film 15 in fig. 1).

In other embodiments, the reflective layer may also be a silver-plated layer disposed on a surface of the diffusion film 14 close to the first brightness enhancement film 15 (e.g., a lower surface of the diffusion film 14 in fig. 1).

Referring to fig. 4, fig. 4 is a schematic diagram illustrating a light shielding principle in the embodiment shown in fig. 3. As shown in fig. 2, the light ray S1 originally leaked from the light source 23 through the reserved gap a directly can be shielded by the reflective layer 70 and will not directly exit the backlight module, so as to avoid directly entering human eyes. The arrangement of the reflective layer 70 does not occupy a separate width space in the width direction, and thus, the width of the non-display area of the backlight assembly can be reduced. Here, the non-display area refers to an area covered by the light-shielding tape 20, and the display area refers to an area not covered by the light-shielding tape 20.

Further, since the reflective layer 70 is used to shield light, the light that is originally emitted directly is reflected back to the light guide plate 13, and the utilization rate of light is improved.

Referring to fig. 5, fig. 5 is a schematic view illustrating another structure of a reflective layer according to an embodiment of the present disclosure. In this embodiment, the reflective surface of the reflective layer is a diffuse reflective surface, so that light rays emitted from the light source directly to the reflective surface are diffusely reflected and uniformly reflected back to the light guide plate 13. In the present embodiment, the reflective layer 80 includes a transparent thin film layer 81 and a silver plated layer 82 plated on a first surface of the transparent thin film layer 81. The first surface is serrated, and the second surface of the transparent film layer 81 opposite to the first surface is a flat surface.

The transparent thin film layer 81 is disposed on the upper surface of the diffusion film 14, and a second surface of the transparent thin film layer 81 is close to the diffusion film 14 and is far from the diffusion film 14.

Referring to fig. 6, fig. 6 is a schematic front view of a diffusion film and a second brightness enhancement film of a backlight module according to a first embodiment of the present application.

The diffusion film 14 and the second brightness enhancement film 16 of the backlight module of the first embodiment of the present application are both rectangular. Fig. 1-4 are cross-sectional views of the backlight module taken along the a-a position of the diffuser film and the second brightness enhancement film in fig. 6, where the a-a position passes through the light source 23. It is understood that in the first embodiment, the cross-sectional views of the diffusion film 14 and the second brightness enhancement film 16 are uniform wherever they pass through the light source 23.

In other embodiments, the diffuser film may further include a diffuser film connecting portion, and the brightness enhancement film may further include a brightness enhancement film connecting portion, in which case, the cross-sectional views at the middle position and the left and right positions are distinguished, as described below.

Referring to fig. 7, fig. 7 is a schematic front view illustrating a diffusion film and a second brightness enhancement film of a backlight module according to a second embodiment of the present application.

In the present embodiment, the diffusion film 34 may include a diffusion film main body portion 341 and a diffusion film connecting portion 342. The number of the diffusion film connecting portions 342 is two. The two diffusion film connecting portions 342 are located at two corners of the light source in the width direction of the diffusion film 34, respectively. In other embodiments, the number of the diffusion film connections 342 may be one, and the diffusion film connections 342 are located at one corner of the diffusion film 34.

The second bright enhancement film 36 may include a bright enhancement film main body 361 and bright enhancement film connecting portions 362, and the number of the bright enhancement film connecting portions 362 may be two and may be located at two corners in the width direction of the second bright enhancement film 36. In other embodiments, the number of the brightness enhancement film connecting portions 362 may be one.

In this embodiment, a cross-sectional view of the backlight module along the middle portion in fig. 7 (i.e., a cross-sectional view of the backlight module along the direction B-B in fig. 7) is the same as the structure of the first embodiment, and is not repeated herein.

In this embodiment, a cross-sectional view of the backlight module (e.g., a cross-sectional view of the backlight module along the direction C-C in fig. 7) along the left and right positions in fig. 7 through the diffuser film connecting portion and the brightness enhancement film connecting portion is different from the cross-sectional view of the backlight module of the first embodiment. This will be described in detail with reference to fig. 8.

Referring to fig. 8, fig. 8 is a cross-sectional view of a backlight module according to a second embodiment of the present application through a diffuser film connecting portion and a brightness enhancement film connecting portion.

In the present embodiment, the back frame 31, the reflective sheet 32, the light guide plate 33, the light homogenizing assembly (not labeled), the light shielding layer 37, the flexible circuit board 38, the connection tape 39, the light shielding tape 40, the first plastic frame 41, the second plastic frame 42, and the light source 43.

The back frame 31 is a box-shaped structure with an opening on one side, the back frame 31 comprises a bottom wall 311 and a side wall 312, the bottom wall 311 is connected with the side wall 312 in a bending mode, and the bottom wall 311 and the side wall 312 enclose an accommodating cavity. The material of the back frame 31 may be metal, such as iron, aluminum, etc.

The reflective sheet 32 is disposed on the bottom wall 311 of the back frame 31 and located inside the accommodating cavity.

The light guide plate 33 is disposed on the reflective sheet 32 and located inside the accommodating cavity.

The light guide plate 33 includes a light incident end portion 331 and a light guide plate main body portion 332, and the light incident end portion 331 of the light guide plate 33 near the light incident side thereof is thicker than the light guide plate main body portion 332.

Optionally, the thickness of the light incident end portion 331 gradually decreases from the light incident side to a direction away from the light incident side, and the thickness of the light guide plate body 332 is uniform, i.e., equal everywhere.

The light source 33 is disposed on the area of the reflective sheet 32 not covered by the light guide plate 33, and the light source 33 is located at the side of the light guide plate 33. The light source 33 is located on the light incident side of the light guide plate 33. Light source 33 may be an LED lamp. The light source 33 is disposed on a side (e.g., the left side in fig. 8) of the light entrance end 331 facing away from the light guide plate main body portion 332.

The light homogenizing assembly comprises a diffusion film 34, a first brightness enhancement film 35 and a second brightness enhancement film 36.

The diffusion film 34, the first brightness enhancement film 35, and the second brightness enhancement film 36 are sequentially stacked on the light guide plate 33 in a direction away from the light guide plate 33. For example, as shown in fig. 8, the diffusion film 34, the first brightness enhancement film 35, and the second brightness enhancement film 36 are sequentially stacked on the light output surface of the light guide plate 33 from bottom to top.

The light-emitting surface of the light guide plate 33 is a surface of the light guide plate 33 away from the reflective sheet 32. For example, as shown in fig. 8, the light exit surface of the light guide plate 33 is the upper surface of the light guide plate 33.

The first brightness enhancement film 35 can also be referred to as a lower brightness enhancement film, and the second brightness enhancement film 36 can also be referred to as an upper brightness enhancement film.

The first rubber frame 31 is disposed on the bottom wall 311 of the back frame 31 and is abutted against the side wall 312 of the back frame 31. The first plastic frame 41 is disposed on a side of the light source 33 away from the light guide plate 33, for example, the first plastic frame 41 is disposed on a left side of the light source 43, and a light mixing and heat dissipating space is left between the first plastic frame 41 and the light source 43.

The flexible circuit board 38 is disposed on an area of the light guide plate 33 not covered by the light unifying assembly.

The light source 43 is fixed to the lower surface of the flexible circuit board 38, and the light source 43 is electrically connected to the flexible circuit board 38. The wiring on the flexible circuit board 38 connects the light source 43 and the external power supply pin so that the external power supply pin can supply power to the light source 43.

The flexible circuit board 38 is connected to the area of the light guide plate 33 not covered by the light unifying assembly by the connection tape 39. The connecting tape 39 may be a double-sided tape. One surface of the double-sided tape is attached to the lower surface of the flexible circuit board 38 at a position corresponding thereto, and the other surface is attached to the upper surface of the light guide plate 33 at a position corresponding thereto.

A reserved gap b is reserved between the end of the flexible circuit board 38 close to the diffusion film 34 and the end of the dodging assembly close to the flexible circuit board 38. The reserved gap b is used for matching assembly errors on one hand, and on the other hand, the backlight module can still be normally used under the condition of certain cold and hot deformation.

In this embodiment, the connection tape 39 may extend toward the diffusion film 34, the connection tape 39 extends beyond one end of the flexible circuit board 38 close to the diffusion film 34, that is, the right end of the connection tape 39 extends beyond the right end of the flexible circuit board 38, the connection tape 39 is further attached to the upper surface of the light guide plate 33 in the area where the reserved gap b is located, and the connection tape 39 may be made of a light shielding material.

The diffusion film 34 may include a diffusion film main body portion 341 and a diffusion film connecting portion 342. The number of the diffusion film connecting portions 342 is two. The two diffusion film connecting portions 342 are located at two corners of the light source in the width direction of the diffusion film 34, respectively. Only one diffusion film junction 342 is shown because fig. 8 is a cross-sectional view at one diffusion film junction.

The diffusion film joining portion 342 extends from the diffusion film body portion 341 toward the connection tape 39 and is overlapped with the connection tape 39. For example, when the connection tape 39 is a double-sided tape, the lower surface of the portion of the connection tape 39 that exceeds the right end of the flexible circuit board 38 is connected to the light guide plate 33, and the upper surface of the portion of the connection tape 39 that exceeds the right end of the flexible circuit board 38 is connected to the lower surface of the diffusion film connecting portion 342.

A light shielding tape 40 is disposed on the flexible circuit board 38, and the light shielding tape 40 is disposed on a partial area of the second brightness enhancement film 36.

The light-shielding layer 37 is completely covered by the light-shielding tape 40 in a perpendicular projection on the light-shielding tape 40.

Alternatively, the light shielding tape 40 may include a first sub light shielding tape portion 401 and a second sub light shielding tape portion 402, the first sub light shielding tape portion 401 covers the flexible circuit board 38, and the second sub light shielding tape portion 402 covers the second brightness enhancement film 36. The thickness of the first sub light shielding tape part 401 may be greater than that of the second sub light shielding tape part 402.

The second bright enhancement film 36 may include a bright enhancement film main body 361 and bright enhancement film connecting portions 362, and the number of the bright enhancement film connecting portions 362 may be two and may be located at two corners in the width direction of the second bright enhancement film 36. The light-adding film connecting portion 362 can be connected to the light-shielding tape 40. For example, the upper surface of the bright enhancement film connecting portion 361 is bonded to the lower surface of the second sub light shielding tape portion 402.

The second glue frame 42 fixes the light shielding tape 40 and the flexible circuit board 38 on a side (e.g., the left side in the drawing) of the light shielding tape 40 and the flexible circuit board 38 away from the second bright enhancement film 36.

The first rubber frame 41 is located in the accommodating cavity of the back frame 31, and the second rubber frame 42 is located outside the accommodating cavity of the back frame 31.

The light shielding layer 37 is disposed between the diffusion film 34 and the first brightness enhancement film 35, and the coverage area of the light shielding layer 37 corresponds to the end area of one end of the diffusion film 34 or the first brightness enhancement film 36 near the light source 43.

Alternatively, in the present embodiment, in the two-side positions shown in fig. 4, the light shielding layer 37 is provided on the upper surface of the diffusion film 34, and the light shielding layer 37 covers an area corresponding to the end area of the left end of the first brightness enhancement film 35.

Optionally, the width of the end region covered by the light-shielding layer 37 is smaller than the width of the second light-shielding tape part 202.

Alternatively, the width of the end region may be 0.1mm-1.2mm, in particular the width of the end region may be 0.1mm, 0.05mm or 1.2 mm. In other words, the width of the light shielding layer 37 may be 0.1mm to 1.2 mm. Specifically, the width of the light-shielding layer 37 may be 0.1mm, 0.05mm, or 1.2 mm.

The light-shielding layer 37 is made of a light-shielding material.

Alternatively, the light shielding layer 37 may be a black ink layer formed on the upper surface of the diffusion film 34 or the lower surface of the first brightness enhancement film 35 by a printing process. The printing process may be a screen printing process. In other embodiments, the light shielding layer 37 may be a black ink layer formed on the upper surface of the diffusion film 34 or the lower surface of the first brightness enhancement film 35 by spraying. It should be understood that the light shielding layer 37 may be formed on the upper surface of the diffusion film 34 or the lower surface of the first brightness enhancement film 35 by other processes, which are not limited in this embodiment.

Referring to fig. 9, fig. 9 is an exploded schematic view of an electronic device according to an embodiment of the disclosure. In this embodiment, the electronic device 50 may be a smart phone, and in other embodiments, the electronic device may also be a tablet computer, a palm computer, a smart watch, and the like.

In the present embodiment, the electronic device 20 includes a rear housing 51, a middle frame 52, a backlight module 53, a display module 54, and a cover plate 55.

The middle frame 52 is fixedly connected with the rear case 51.

The display module 51 is stacked on the backlight module 53, and both the display module 51 and the backlight module 53 are fixed on the middle frame 52.

The backlight module 53 is used for providing backlight for the display module 51.

The display module 51 may be a liquid crystal display panel or other display panel.

The cover plate 55 covers the display module 54. The cover 55 may be a transparent glass cover, and in the non-display area, the cover 55 may be opaque. For example, the cover plate 55 is coated with a light shielding ink in the non-display area.

It is to be understood that other structures of the electronic device, such as a circuit board, etc., may be provided between the rear case 51 and the middle frame 52, and will not be specifically described herein since the present application is not directed to improvements of these components.

In other embodiments, the electronic device 50 may have other structures, and the description of the structure of the electronic device 50 is not intended to limit the scope of the present application.

The embodiment of this application includes through setting up backlight unit: a light guide plate; a light source disposed at a side of the light guide plate; the diffusion film, the first brightness enhancement film and the second brightness enhancement film are sequentially arranged on the light guide plate; the light shield layer, the setting is between first membrane and the second membrane that adds lustre to, and the coverage area of light shield layer is close to the tip region of the one end of light source corresponding to diffusion barrier or first membrane that adds lustre to make backlight unit need not set up in addition and occupy the light-shielding structure of non-display area width alone, the light shield layer overlaps with first membrane or diffusion barrier part that adds lustre to, can be under the condition of the width that the non-display area that reduces backlight unit occupies, avoid backlight unit to appear the light leak.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A backlight module is characterized in that the backlight module comprises:

the light guide plate comprises a light inlet end part and a light guide plate main body part;

the light source is arranged on one side, away from the light guide plate main body part, of the light inlet end part;

the light homogenizing assembly comprises a diffusion film, a first brightness enhancement film and a second brightness enhancement film which are sequentially stacked on the main body part of the light guide plate along the direction far away from the light guide plate;

the flexible circuit board is partially arranged on the area of the light guide plate which is not covered by the light uniformizing assembly, and the light source is electrically connected with the flexible circuit board;

the connecting adhesive tape is arranged between the flexible circuit board and the area of the light guide plate, which is not covered by the light uniformizing assembly, are bonded through the connecting adhesive tape, and the connecting adhesive tape is made of a light shading material;

a reserved gap is formed between one end, close to the dodging assembly, of the flexible circuit board and one end, close to the flexible circuit board, of the dodging assembly, the connecting adhesive tape extends towards the diffusion film, exceeds one end, close to the diffusion film, of the flexible circuit board, and then is attached to the upper surface of the light guide plate in the area where the reserved gap is located;

the shading adhesive tape is arranged on one surface of the flexible circuit board, which is far away from the light source, and is connected with the second bright enhancement film;

and the shading layer is arranged between the diffusion film and the first brightness enhancement film, and the covering area of the shading layer corresponds to the end area of one end, close to the light source, of the diffusion film or the first brightness enhancement film.

2. The backlight module as claimed in claim 1, wherein the light shielding layer is a black ink layer formed on the surface of the diffusion film close to the first brightness enhancement film or the surface of the first brightness enhancement film close to the diffusion film by a printing process.

3. The backlight module as claimed in claim 1, wherein the first and second brightness enhancement films are provided as an integral film layer, and the integral film layer and the diffusion film are independent films.

4. The backlight module as claimed in claim 1, wherein the second brightness enhancement film comprises a main body and a connecting portion, the connecting portion extends from a side of the main body close to the light-shielding tape, and the connecting portion is connected to the light-shielding tape.

5. The backlight module as claimed in claim 1, wherein a vertical projection of the light shielding layer on the light shielding tape is completely covered by the light shielding tape.

6. The backlight module as claimed in claim 1, wherein the light shielding layer is a reflective layer, a reflective surface of the reflective layer faces the light guide plate, and the reflective layer is configured to reflect light directly emitted from the light source to the reflective layer back to the light guide plate.

7. The backlight module of claim 6, wherein the reflective layer comprises a transparent film layer adjacent to the diffuser film and a silver plated layer adjacent to the first brightness enhancement film.

8. An electronic device, characterized in that the electronic device comprises a backlight module according to any one of claims 1-7.