CN108317436B - Backlight module and electronic device - Google Patents

Backlight module and electronic device Download PDF

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Publication number
CN108317436B
CN108317436B CN201810104765.8A CN201810104765A CN108317436B CN 108317436 B CN108317436 B CN 108317436B CN 201810104765 A CN201810104765 A CN 201810104765A CN 108317436 B CN108317436 B CN 108317436B
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CN
China
Prior art keywords
light
backlight module
fpc
brightness enhancement
film
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Active
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CN201810104765.8A
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Chinese (zh)
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CN108317436A (en
Inventor
陆忠恒
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Priority to CN201810104765.8A priority Critical patent/CN108317436B/en
Publication of CN108317436A publication Critical patent/CN108317436A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V1/00—Shades for light sources, i.e. lampshades for table, floor, wall or ceiling lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/08—Refractors for light sources producing an asymmetric light distribution
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • F21V2200/20—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of a generally planar shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Abstract

The application discloses backlight module and electronic device. The backlight module includes: the light guide plate comprises a light incident surface and a light emergent surface; the light sources are arranged on one side of the light incident surface and are arranged at intervals; and the brightness enhancement layer is arranged between two adjacent light sources and used for increasing the brightness between the two adjacent light sources so as to prevent dark areas between the light sources. Therefore, the backlight module is uniform in light transmission, and bright-dark parallax is prevented.

Description

Backlight module and electronic device
Technical Field
The present disclosure relates to backlight devices, and particularly to a backlight module and 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.
The backlight module is an important component of an electronic device, and currently, a side-in type backlight module is generally adopted in a backlight module of a portable electronic device such as a smart phone, and light emitted by a light source is emitted into a light guide plate from the side edge of the light guide plate, and is guided by the light guide plate to provide backlight for a display panel of the electronic device. The light emitted by the light source is in a scattering state, but the intensity of the light is smaller when the angle is larger, so that a dark area is easily generated at a position between the two light sources due to insufficient light, and the display of the display panel is influenced.
Disclosure of Invention
In one aspect, an embodiment of the present application provides a backlight module, which includes: the light guide plate comprises a light incident surface and a light emergent surface; the light sources are arranged on one side of the light incident surface and are arranged at intervals; and the brightness enhancement layer is arranged between two adjacent light sources and used for increasing the brightness between the two adjacent light sources so as to prevent dark areas between the light sources.
On the other hand, an embodiment of the present application further provides an electronic device, which includes the backlight module described above.
The embodiment of the application sets up the brightening layer between two adjacent light sources, and the brightening layer can increase the brightness between two adjacent light sources, thereby preventing the phenomenon of dark space between the light sources due to insufficient light, enabling the backlight module to be even in light transmission and preventing light and dark parallax.
Drawings
Fig. 1 is a schematic front view illustrating a backlight module according to a first embodiment of the present application;
3 FIG. 32 3 is 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 of 3 the 3 backlight 3 module 3 shown 3 in 3 FIG. 31 3 taken 3 along 3 the 3 direction 3 A 3- 3 A 3; 3
FIG. 3 is a schematic cross-sectional view of the backlight module shown in FIG. 1 taken along the direction B-B;
FIG. 4 is a schematic structural diagram of a light uniformizing element of the backlight module shown in FIG. 1;
FIG. 5 is a schematic view illustrating a light shielding layer of a backlight module according to a first embodiment of the present disclosure;
FIG. 6 is a schematic cross-sectional view of a backlight module according to a second embodiment of the present application, taken along the C-C direction of the diffuser film and the second brightness enhancement film shown in FIG. 8;
FIG. 7 is a schematic cross-sectional view of a backlight module according to a second embodiment of the present application, taken along the D-D direction of the diffuser film and the second brightness enhancement film shown in FIG. 8;
FIG. 8 is a schematic view of the diffusion film and second brightness enhancement film of a second embodiment of the present application;
FIG. 9 is a schematic cross-sectional view of a backlight module according to a third embodiment of the present application, taken along the direction E-E of the first brightness enhancement film shown in FIG. 10;
fig. 10 is a schematic structural view of a first brightness enhancement film according to a third embodiment of the present application;
fig. 11 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 to 3, fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application. 3 FIG. 32 3 is 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 of 3 the 3 backlight 3 module 3 shown 3 in 3 FIG. 31 3 taken 3 along 3 the 3 direction 3 A 3- 3 A 3; 3 Fig. 3 is a schematic cross-sectional view of the backlight module shown in fig. 1 taken along the direction B-B. In the present embodiment, the backlight module includes a back frame 11, a reflective sheet 12, a light guide plate 13, a light uniformizing element 14, a light source 15 and a brightness enhancing layer 20.
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 back frame 11 may be made of metal, such as iron or aluminum, or plastic.
The reflective sheet 12 is disposed on the bottom wall 111 of the back frame 11 and located inside the accommodating cavity. The reflective sheet 12 may reflect incident light.
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 131 and a light guide plate main body 132, the light incident end 131 is provided with a light incident surface 133, and the light guide plate main body 132 is provided with a light emitting surface 134. The thickness of the light incident end 131 is greater than that of the light guide plate main body 132, and the thickness of the light incident end 131 gradually decreases from the light incident surface 133 to the direction away from the light incident surface 133, so that the thickness of the light guide plate main body 132 is uniform, that is, equal everywhere.
The light sources 15 are disposed on the light incident surface 131 side, and the light sources 15 are disposed at intervals. And a light source 15 is positioned on an area of the reflective sheet 12 not covered by the light guide plate 13. The light source 15 may be an LED lamp.
The light uniformizing element 14 is disposed on the light emitting surface 134 of the light guide plate 13, and one end of the light uniformizing element 14 close to the light incident surface 132 is located in the non-display region 140.
The light emitted from the light source 15 enters the light entrance end 131 of the light guide plate 13 through the light entrance surface 133 of the light guide plate 13, the light entrance end 131 guides the light into the light guide plate main body 132 by using the wedge structure, the light guide plate main body 132 guides the light to spread over the whole light guide plate main body 132 and then transmits the light to the light uniformizing element 14, and the incident light is diffused, condensed, brightened and the like by the light uniformizing element 14 and then is output as a backlight module. Part of the light leaking from the side of the light guide plate 13 away from the light exit surface 134 is reflected back into the light guide plate 13 by the reflective sheet 12.
It will be appreciated that the light output from the backlight will be displayed in the display area to form the desired image. In order to pursue a high screen ratio, i.e., a wide screen or even a full screen design, a very demanding limitation is imposed on the design width of the non-display region, and the width of the non-display region 140 limits the size of the components therein. For example, the light source 15, which is usually disposed to be extremely small, is disposed in the non-display region 140 and is located on the side of the light incident surface 133 of the light guide plate 13. The light emitted from the light source 15 to both sides thereof is very limited, which results in a dark area phenomenon in the display between two adjacent light sources 15 due to insufficient light, as shown in fig. 1.
In this regard, the brightness enhancing layer 20 is provided between two adjacent light sources 15 in this embodiment to avoid the problem of light and dark parallax.
In particular, as shown in FIGS. 1 and 2, a brightness enhancing layer 20 is disposed between two adjacent light sources 15 to enhance the brightness between the two adjacent light sources 15.
The brightness enhancing layer 20 may be a phosphor layer. The fluorescent powder emits light under the stimulation of light, so that the light between the two adjacent light sources 15 is supplemented, the backlight module is uniform in light transmission, and the problem of light and dark parallax is solved.
It will be appreciated that other materials may be used for the brightness enhancing layer 20.
The brightness enhancing layer 20 is disposed uniformly along the direction of arrangement of the light sources 15. That is, the thickness of the brightness enhancing layer 20 is equal everywhere along the direction of the arrangement of the light sources 15.
The brightness enhancing layer 20 may also be provided with a thickness that increases progressively in a direction away from the light source 15.
The brightness enhancing layer 20 may be formed by a silk screening process, a spray coating process, or a photo mask etching process. The manner in which the brightness enhancing layer 20 is formed is not limited in this application.
The problem of dark areas between the light sources 15 when designing a narrow bezel or full screen is solved by providing a brightness enhancing layer 20. However, due to the narrow bezel design, some elements that are not essential for light emission and transmission, such as some elements that only block light, are usually removed. This easily causes a light leakage phenomenon in the non-display region. In contrast, in the present embodiment, a light-shielding layer is disposed in the non-display region to avoid the problem of light leakage.
Specifically, the light uniformizing element 14 includes a diffusion film 141, a first brightness enhancement film 142, and a second brightness enhancement film 143, which are sequentially disposed on the light output surface 134. The first brightness enhancement film 142, the second brightness enhancement film 143, and the diffusion film 141 are independent films. That is, the first brightness enhancement film 142, the second brightness enhancement film 143, and the diffusion film 141 are independently completed and mounted together. The diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 may have the same shape, and may have a square structure, as shown in fig. 4.
The first brightness enhancement film 142 can be referred to as a lower brightness enhancement film, and the second brightness enhancement film 143 can be referred to as an upper brightness enhancement film.
The backlight module further includes a light-shielding layer 16. The light-shielding layer 16 is disposed in the non-display region 140. The light shielding layer 16 is provided between the light guide plate 13 and the diffusion film 141. More specifically, the light shielding layer 16 is provided between the diffusion film 141 and the light guide plate main body portion 132. The light-shielding layer 16 is formed to have a uniform thickness.
Therefore, light emitted from the light source 15 can be prevented from leaking to the outside in the non-display area 140, and light leakage of the backlight module can be avoided under the condition that the width of the non-display area occupied by the backlight module is reduced.
The light-shielding layer 16 is a black ink layer formed by a screen printing process. May be formed on the surface of the diffusion film 141 near the light guide plate 13, or may be formed on the surface of the light guide plate 13 near the diffusion film 141. In other embodiments, the light shielding layer 16 may be formed by spraying. It should be understood that the light shielding layer 16 may also be formed by other processes, which is not limited in this embodiment.
A brightness enhancing layer 20 is disposed on the light blocking layer 16. Specifically, the brightness enhancing layer 20 may be disposed between the light blocking layer 16 and the diffuser film 141. It will be appreciated that in other embodiments, the brightness enhancing layer 20 may also be disposed between the light blocking layer 16 and the light guide plate 13.
The backlight module further includes an FPC (Flexible Printed Circuit) Circuit board 17 and an FPC fixing tape 18. The FPC board 17 is disposed on the light source 15 and electrically connected to the light source 15 to transmit a control signal provided from the outside to the light source 15. Further, the FPC board 17 is disposed at an interval from the light unifying element 14 with a gap a therebetween. The 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.
The FPC fixing tape 18 is disposed between the FPC circuit board 17 and the light guide plate 13 to fix the FPC circuit board 17 on the light guide plate 13. Specifically, the FPC fixing tape 18 is a tape having an adhesive on both surfaces, and one surface thereof is adhered and fixed to the FPC board 17, and the other surface thereof is adhered and fixed to the light guide plate 13. In this embodiment, the FPC fixing tape 18 may be disposed at an interval from the light uniformizing element 14 to form a part of the gap a.
Further, the backlight module further includes a light-shielding tape 19 disposed on the FPC board 17 and on the second brightness enhancement film 143 in the non-display area 140.
The light shielding tape 19 may include a first light shielding portion 191 and a second light shielding portion 192. The first shading part 191 covers the FPC board 17, and the second shading part 192 covers the second bright enhancement film 143. More specifically, on the second brightness enhancement film 143. The thickness of the first light shielding portion 191 may be greater than that of the second light shielding portion 192. The second light-shielding portion 192 shields the portion of the second brightness enhancement film 143 located in the non-display area 140, and applies a suitable force to the second brightness enhancement film 143, so that the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 can be fixed on the light-emitting surface 134 of the light guide plate 13.
Further, the light shielding tape 191 is provided with an adhesive on at least a side surface of the second light shielding portion 192 close to the second bright enhancement film 143, and further fixes the second bright enhancement film 143 by adhesion.
Further, the backlight module further includes a middle frame 21 and an outer frame 22. The outer frame 22 fixes the light-shielding tape 19 and the FPC board 17 on the side (left side in the figure) of the light-shielding tape 19 and the FPC board 17 away from the second brightness enhancement film 143. The middle frame 21 may be integrally formed with the outer frame 22.
The middle frame 21 is located in the accommodating cavity of the back frame 11, is disposed on a side of the light source 15 away from the light incident surface 133, and is used for supporting the FPC board 17 and the light-shielding tape 19. The outer frame 22 is located outside the accommodating cavity of the back frame 11. The middle frame 21 and the outer frame 22 may be made of metal, such as iron or aluminum, or plastic.
Referring to fig. 5, fig. 5 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. 5, the light ray S1 is originally a light ray directly emitted from the light source 15 through the gap a to cause light leakage in the non-display region 140, and the light shielding layer 16 can block the light ray and prevent the light ray from directly emitting out of the backlight module, thereby preventing the light ray from directly entering human eyes. The light shielding layer 16 does not occupy a separate width space in the width direction, and thus, the thickness of the non-display area of the backlight module can be reduced. Here, the non-display area is an area covered with the light-shielding tape 19, and the display area is an area not covered with the light-shielding tape 19.
Further, because this application is provided with the brightening layer 20 between two adjacent light sources 15, can carry out the brightening to the position between the light sources 15, can avoid the phenomenon of dark space from this, prevent the light and shade parallax error.
In this embodiment, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are independent films. In other embodiments, the first brightness enhancement film 142 and the second brightness enhancement film 143 can also be composite films, that is, the first brightness enhancement film 142 and the second brightness enhancement film 143 are integrated films, and one film and the diffusion film 141 are independent films, that is, a structure of two composite films. In other embodiments, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 can also be provided as other composite films, for example, the first brightness enhancement film 142 and the second brightness enhancement film 143 are an integrated film layer.
The light-shielding layer 16 may be provided at other positions, for example, at any one or more of the following positions: the diffusion film 141 and the first brightness enhancement film 142, the first brightness enhancement film 142 and the second brightness enhancement film 143, the second brightness enhancement film 143 and the light-shielding tape 19, and the side of the light uniformizing element 14 close to the FPC board 17.
3 referring 3 to 3 fig. 3 6 3- 3 8 3, 3 fig. 3 6 3 is 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 of 3 a 3 backlight 3 module 3 according 3 to 3 a 3 second 3 embodiment 3 of 3 the 3 present 3 application 3, 3 the 3 cross 3- 3 sectional 3 view 3 being 3 cut 3 along 3 a 3 C 3- 3 C 3 direction 3 of 3 the 3 diffusion 3 film 3 and 3 the 3 second 3 brightness 3 enhancement 3 film 3 shown 3 in 3 fig. 3 8 3, 3 wherein 3 the 3 C 3- 3 C 3 direction 3 corresponds 3 to 3 an 3 a 3- 3 a 3 direction 3 of 3 the 3 backlight 3 module 3 shown 3 in 3 fig. 31 3. 3 Fig. 7 is a schematic cross-sectional view of a backlight module according to a second embodiment of the present application, cut along the direction D-D of the diffuser film and the second brightness enhancement film shown in fig. 8. Wherein the direction D-D corresponds to the direction B-B of the backlight module shown in FIG. 1. Fig. 8 is a schematic structural view of a diffusion film and a second brightness enhancement film according to a second embodiment of the present application.
First, as shown in fig. 6, in the present embodiment, the backlight module still includes a back frame 41, a reflective sheet 42, a light guide plate 43, a light uniformizing element 44, a light source 45, a light shielding layer 46, an FPC circuit board 47, an FPC fixing tape 48, a light shielding tape 49, a brightness enhancement layer 50, a middle frame 51 and an outer frame 52. The structures of the back frame 41, the reflective sheet 42, the light guide plate 43, the light source 45, the light shielding layer 46, the FPC circuit board 47, the light shielding tape 49, the brightness enhancement layer 50, the middle frame 51, and the outer frame 52 are respectively the same as those of the back frame 11, the reflective sheet 12, the light guide plate 13, the light source 15, the light shielding layer 16, the FPC circuit board 17, the light shielding tape 19, the brightness enhancement layer 20, the middle frame 21, and the outer frame 22, which are described above, and thus are not described herein again.
The FPC fixing tape 48 of the present embodiment further extends from the direction of the FPC board 47 to the direction of the light unifying element 44. Thus, the present embodiment has only the gap b between the FPC board 47 and the light unifying element 44.
The FPC fixing tape 48 may further have a black light-shielding material or a black light-shielding material provided on the upper surface or the lower surface or both of the upper surface and the lower surface to shield light, in addition to providing an adhesive agent on the upper surface and the lower surface to fix the FPC board 47 to the light guide plate 43.
Specifically, the FPC fixing tape 48 may be a black tape. The FPC fixing tape 48 may be provided with a black ink layer on the upper surface or the lower surface thereof or on the upper surface and the lower surface thereof to shield light. The arrangement of the black ink layer may be the same as that described above, and will not be described herein again.
The light uniformizing element 44 of the present embodiment includes a diffusion film 441, a first brightness enhancement film 442, and a second brightness enhancement film 443, which are sequentially disposed on the light exiting surface of the light guide plate 43. The diffusion film 441 and the first and second brightness enhancement films 442 and 443 are independent films, and the specific structure is as described above and will not be described herein again.
The light shielding layer 46 is provided between the diffusion film 441 and the light guide plate 43.
Please refer to FIG. 8. The diffusion film 441 includes a diffusion main body 4411 and a diffusion extension portion 4412 extending from the diffusion main body 4411 in the direction of the FPC fixing tape 48. The diffusion body 4411 is attached to the FPC fixing tape 48 at its side as shown in fig. 7. The diffusion extension 4412 is provided on the FPC fixing tape 48 as shown in fig. 6.
The diffusion extension portions 4412 are two and are respectively located at both sides of the diffusion film 441. It should be understood that in other embodiments, the number of diffusion extensions 4412 may be other, such as one or three, etc.
The light shielding layer 46 is disposed between the diffusion body 4411 and the light guide plate 43, as shown in fig. 6 and 7. It should be understood that the light shielding layer 46 may be further disposed between the diffusion extension part 4412 and the FPC fixing tape 48 at both sides of the diffusion film 441, i.e., at the position of the diffusion extension part 4412, as shown in fig. 6.
A brightness enhancing layer 50 is positioned between the two light sources 45, in a configuration similar to that shown in FIG. 1. And a brightness enhancing layer 50 is disposed over the light blocking layer 46, as shown in fig. 6. More specifically, the light intensifying layer 50 may be disposed on the light shielding layer 46 between the diffusion body 4411 and the light guide plate 43.
The second bright enhancement film 443 includes a bright enhancement main body 4431 provided on the first bright enhancement film 442 and a bright enhancement extending portion 4432 extending from the bright enhancement main body 4431 in the direction of the FPC fixing tape 48, and the bright enhancement extending portion 4432 is provided on the diffusion extending portion 4412.
Similarly, the light-increasing extension portions 4432 may also include two light-increasing films 443 respectively disposed on two sides of the second light-increasing film. In the present embodiment, the position and shape size of the light intensifying extension 4432 may be the same as those of the diffusion extension 4412. It should be understood that in other embodiments, the number of light enhancement extensions 4432 may be other, such as one or three, etc. The light enhancement extension 4432 may have other shapes and sizes, and will not be described herein.
As described above, the FPC fixing tape 48 of the present embodiment can block the light emitted from the light source 45 from being directly incident on the gap b, thereby preventing the light from leaking out of the gap b. In addition, the light shielding tape 46 may prevent leakage of light at other positions of the non-display region 440.
Further, because this application is provided with the brightening layer 50 between two adjacent light sources 45, can carry out the brightening to the position between the light sources 45, can avoid the phenomenon of dark space from this, prevent the light and shade parallax error.
It should be understood that the diffusion film 441, the first brightness enhancement film 442, and the second brightness enhancement film 443 of the present embodiment can also be a composite film, specifically, the first brightness enhancement film 442 and the second brightness enhancement film 443 are an integrated film layer, the integrated film layer and the diffusion film 441 are independent film layers, or the diffusion film 441, the first brightness enhancement film 442, and the second brightness enhancement film 443 are an integrated film layer, which is specifically described above and will not be described herein again.
Similarly, the light-shielding layer 46 of the present embodiment can also be disposed at other positions, as described above, and will not be described herein again.
Referring to fig. 9 and 10, fig. 9 is a schematic cross-sectional structure view of a backlight module according to a third embodiment of the present application, cut along the direction E-E of the first brightness enhancement film shown in fig. 10. 3 wherein 3 the 3 E 3- 3 E 3 direction 3 corresponds 3 to 3 the 3 A 3- 3 A 3 direction 3 of 3 the 3 backlight 3 module 3 shown 3 in 3 FIG. 31 3. 3
As shown in fig. 9, in the present embodiment, the backlight module still includes a back frame 71, a reflective sheet 72, a light guide plate 73, a light equalizing element 74, a light source (not shown), a light shielding layer 76, an FPC circuit board 77, an FPC fixing tape 78, a light shielding tape 79, a brightness enhancing layer 80, a middle frame 81 and an outer frame 82. The structures of the back frame 71, the reflective sheet 72, the light guide plate 73, the light source, the light shielding layer 76, the FPC circuit board 77, the light shielding tape 79, the brightness enhancement layer 80, the middle frame 81, and the outer frame 82 are respectively the same as those of the back frame 11, the reflective sheet 12, the light guide plate 13, the light source 15, the light shielding layer 16, the FPC circuit board 17, the light shielding tape 19, the brightness enhancement layer 20, the middle frame 21, and the outer frame 22, which are described above, and thus are not described herein again.
The FPC fixing tape 78 of the present embodiment further extends from the direction of the FPC board 77 toward the direction of the light uniformizing element 74, and is in contact with the side surface of the diffusion film 741. Thus, the present embodiment has only the gap c between the FPC board 77 and the dodging member 74.
The FPC fixing tape 78 may be provided with a black light shielding material on the upper surface or the lower surface or both surfaces to shield light, in addition to providing an adhesive on the upper surface and the lower surface to fix the FPC board 77 to the light guide plate 73.
Specifically, the FPC fixing tape 78 may be black tape. The FPC fixing tape 78 may also be provided with a black ink layer on the upper surface or the lower surface thereof or on the upper surface and the lower surface thereof to play a role of shading light. The arrangement of the black ink layer may be the same as that described above, and will not be described herein again.
The light uniformizing element 74 of the present embodiment includes a diffusion film 741, a first brightness enhancement film 742, and a second brightness enhancement film 743, which are sequentially disposed on the light exiting surface of the light guide plate 73. The diffusion film 741, the first brightness enhancement film 742 and the second brightness enhancement film 743 are independent films, and as mentioned above, they are not described herein again.
The light shielding layer 76 is provided between the diffusion film 741 and the light guide plate 73. A brightness enhancing layer 80 is located between the two light sources and is disposed on the light blocking layer 76, similar to the structure shown in FIG. 1.
Please refer to fig. 10. The first brightness enhancement film 742 includes a brightness enhancement main body 7421 provided on the diffusion film 741 and a brightness enhancement extension portion 7422 extending from the brightness enhancement main body 7421 in the direction of the FPC fixing tape 48, and the brightness enhancement extension portion 7422 is provided on the FPC fixing tape 48. The diffusion film 741 and the intensifying body 7422 may have the same shape and size.
It should be understood that fig. 9 is a schematic cross-sectional view of fig. 10 cut along the direction of the light-enhancing extension 7422 of the first light-enhancing film 742, i.e., along the direction E-E shown in fig. 10. If the first brightness enhancement film 742 is cut along the direction of the brightness enhancement body 7421 and corresponding to the light source, the cross-sectional structure is the same as that of fig. 7, and will not be described again.
Specifically, the light shielding layer 76 is provided between the diffusion film 741 and the light guide plate 73. It should be understood that the light shielding layer 76 can also be disposed between the light enhancement extension 7422 and the FPC fixing tape 78 at two sides of the first light enhancement film 742, i.e. at the position of the light enhancement extension 7422.
As described above, the FPC fixing tape 78 of the present embodiment can block the light emitted from the light source 75 from being directly incident into the gap c, thereby preventing the light from leaking out of the gap c. Further, the light shielding tape 76 can prevent leakage of light at other positions of the non-display area.
Further, because this application is provided with brightening layer 80 between two adjacent light sources, can carry out the brightening to the position between the light source, can avoid the phenomenon of dark space from this, prevent the light and shade parallax error.
It should be understood that the diffusion film 741, the first brightness enhancement film 742 and the second brightness enhancement film 743 of the present embodiment may also be a composite film, and specifically, the first brightness enhancement film 742 and the second brightness enhancement film 743 are an integrated film layer, the integrated film layer and the diffusion film 741 are independent films, or the diffusion film 741, the first brightness enhancement film 742 and the second brightness enhancement film 743 are an integrated film layer. As described above, the details are not repeated herein.
Similarly, the light-shielding layer 76 of the present embodiment may also be disposed at other positions, as described above, and will not be described herein again.
Referring to fig. 11, fig. 11 is an exploded schematic view of an electronic device according to an embodiment of the disclosure. In this embodiment, the electronic device 90 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 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 connected 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 fixed to the middle frame 92.
The backlight module 93 is used for providing backlight for the display module 94.
The display module 94 may be a liquid crystal display panel or other display panel.
The cover plate 95 covers the display module 94. The cover 95 may be a transparent glass cover, and in the non-display area, the cover 95 may be opaque. For example, the cover plate 95 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 91 and the middle frame 92, 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 90 may have other structures, and the description of the structure of the electronic device 90 is not intended to limit the scope of the present application.
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 (9)

1. A backlight module is characterized in that the backlight module comprises:
the light guide plate comprises a light incident surface and a light emergent surface;
the light sources are arranged on one side of the light incident surface and are arranged at intervals;
the light homogenizing element comprises a diffusion film, a first brightness enhancement film and a second brightness enhancement film which are sequentially arranged on the light emitting surface, and one end, close to the light incident surface, of the light homogenizing element is located in the non-display area;
the FPC circuit board is arranged on the area, which is not covered by the light uniformizing element, of the light guide plate and is arranged on the light source, and the FPC circuit board is electrically connected with the light source; the FPC circuit board and the dodging element are arranged at intervals, and a gap is formed between the FPC circuit board and the dodging element;
the FPC fixing adhesive tape is arranged between the FPC circuit board and the light guide plate so as to fix the FPC circuit board on the light guide plate, and the FPC fixing adhesive tape is a black adhesive tape or is provided with a black ink layer on the surface of the FPC fixing adhesive tape to play a role of shading light;
a light shielding layer disposed between the light guide plate and the diffusion film, the light shielding layer being disposed in the non-display region;
the brightness enhancement layer is arranged between the light shielding layer and the diffusion film and between two adjacent light sources and used for increasing the brightness between the two adjacent light sources so as to prevent dark areas between the light sources;
the FPC fixing adhesive tape further extends from the direction of the FPC circuit board to the direction of the dodging element in the area where the gap is located;
the diffusion film comprises a diffusion main body and a diffusion extension part extending from the diffusion main body to the FPC fixing adhesive tape, the side surface of the diffusion main body is connected with the FPC fixing adhesive tape, and the diffusion extension part is arranged on the FPC fixing adhesive tape; the light shielding layer may be further disposed between the diffusion extension portion and the FPC fixing tape.
2. The backlight module of claim 1, wherein the brightness enhancing layer is a phosphor layer.
3. A backlight module according to claim 1, wherein the brightness enhancing layer is disposed uniformly along the direction of the arrangement of the light sources.
4. A backlight module according to claim 1, wherein the brightness enhancing layer is disposed along the direction of the arrangement of the light sources, and the thickness of the brightness enhancing layer increases in a direction away from the light sources.
5. The backlight module as claimed in claim 1, wherein the light-shielding layer has a uniform thickness.
6. The backlight module as claimed in claim 1, wherein the diffuser film, the first brightness enhancement film and the second brightness enhancement film are independent films.
7. The backlight module as claimed in claim 1, wherein the first and second brightness enhancement films are integrated films, and the integrated films and the diffusion film are independent films.
8. The backlight module according to any one of claims 2 to 7, further comprising a light-shielding tape disposed on the FPC board and on the second brightness enhancement film at a position in the non-display region for fixing the second brightness enhancement film.
9. An electronic device, characterized in that the electronic device comprises the backlight module of any one of claims 1-8.
CN201810104765.8A 2018-01-31 2018-01-31 Backlight module and electronic device Active CN108317436B (en)

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CN110095835A (en) * 2018-01-31 2019-08-06 广东欧珀移动通信有限公司 A kind of backlight module and electronic device
CN110632797A (en) * 2019-10-29 2019-12-31 维沃移动通信有限公司 Backlight and electronic equipment
CN111367009A (en) * 2020-04-10 2020-07-03 博讯光电科技(合肥)有限公司 Light guide plate with novel structure
CN112558355A (en) * 2020-12-17 2021-03-26 业成科技（成都）有限公司 Backlight module and display panel
US11448812B1 (en) * 2021-09-03 2022-09-20 Innolux Corporation Backlight module including adhesive structure and electronic device including the same

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JP5532104B2 (en) * 2012-10-18 2014-06-25 オムロン株式会社 Surface light source device, liquid crystal display device, and mobile device
TW201525577A (en) * 2013-12-16 2015-07-01 Qisda Corp Display device and backlight module thereof
CN105987327A (en) * 2015-07-21 2016-10-05 乐视致新电子科技（天津）有限公司 Side-into type backlight module and display device

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