CN116592319A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
- Publication number
- CN116592319A CN116592319A CN202310484929.5A CN202310484929A CN116592319A CN 116592319 A CN116592319 A CN 116592319A CN 202310484929 A CN202310484929 A CN 202310484929A CN 116592319 A CN116592319 A CN 116592319A
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- Prior art keywords
- heat dissipation
- film
- sandwich composite
- backlight module
- composite film
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- 230000017525 heat dissipation Effects 0.000 claims abstract description 188
- 239000002131 composite material Substances 0.000 claims abstract description 148
- 239000002245 particle Substances 0.000 claims abstract description 88
- 239000010408 film Substances 0.000 claims description 261
- 239000011324 bead Substances 0.000 claims description 42
- 239000000758 substrate Substances 0.000 claims description 22
- FFBGYFUYJVKRNV-UHFFFAOYSA-N boranylidynephosphane Chemical compound P#B FFBGYFUYJVKRNV-UHFFFAOYSA-N 0.000 claims description 20
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 16
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 16
- 229910052582 BN Inorganic materials 0.000 claims description 13
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical group N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 13
- 239000002135 nanosheet Substances 0.000 claims description 12
- 239000012788 optical film Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 4
- 238000010292 electrical insulation Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 description 22
- 239000012528 membrane Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000011231 conductive filler Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002064 nanoplatelet Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/60—Composite insulating bodies
-
- 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
- F21V19/00—Fastening of light sources or lamp holders
-
- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
-
- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
-
- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
-
- 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
-
- 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
- G02F1/133345—Insulating layers
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
-
- 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
- F21Y2105/00—Planar light sources
-
- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/42—Arrangements for providing conduction through an insulating substrate
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Theoretical Computer Science (AREA)
- Planar Illumination Modules (AREA)
Abstract
The application provides a backlight module and a display device. The backlight module includes backplate and luminous subassembly, and luminous subassembly bears in the backplate, and luminous subassembly includes lamp plate and a plurality of lamp pearl, and a plurality of lamp pearl intervals set up on the lamp plate, and backlight module includes: the sandwich composite film is arranged between the back plate and the lamp panel, and comprises a first film layer, a second film layer and a third film layer which are sequentially laminated, wherein the first film layer comprises a plurality of first heat dissipation particles, the first heat dissipation particles are connected to form a first heat dissipation path, the second film layer is an insulating layer, the third film layer comprises a plurality of second heat dissipation particles, the second heat dissipation particles are connected to form a second heat dissipation path, a plurality of third heat dissipation paths are formed between the first heat dissipation particles and the second film layer, and a plurality of fourth heat dissipation paths are formed between the second heat dissipation particles and the second film layer. The backlight module provided by the application has good heat dissipation capacity and electrical insulation performance at the back plate.
Description
Technical Field
The application relates to the technical field of display equipment, in particular to a backlight module and a display device.
Background
During the development of electronic devices, heat dissipation problems have been present. In recent years, due to the miniaturization and integration of electronic devices, heat dissipation has become a critical issue. High temperatures can lead to reduced stability, lifetime, and reliability of the electronic device.
However, at present, when heat is dissipated from an electronic device (for example, a display device), electrical insulation performance cannot be considered.
Disclosure of Invention
In a first aspect, the present application provides a backlight module, including a back plate and a light emitting assembly, where the light emitting assembly is carried on the back plate, the light emitting assembly includes a lamp panel and a plurality of lamp beads, and the plurality of lamp beads are disposed on the lamp panel at intervals, and the backlight module includes:
the sandwich composite film is arranged between the back plate and the lamp panel, the sandwich composite film comprises a first film layer, a second film layer and a third film layer which are sequentially laminated, the first film layer comprises a plurality of first heat dissipation particles, the first heat dissipation particles are connected to form a first heat dissipation path, the second film layer is an insulating layer, the third film layer comprises a plurality of second heat dissipation particles, the second heat dissipation particles are connected to form a second heat dissipation path, a plurality of third heat dissipation paths are formed between the first heat dissipation particles and the second film layer, and a plurality of fourth heat dissipation paths are formed between the second heat dissipation particles and the second film layer.
The first film layer further comprises a first substrate, the first heat dissipation particles are distributed in the first substrate, the third film layer further comprises a second substrate, the second heat dissipation particles are distributed in the second substrate, the first heat dissipation particles and the second heat dissipation particles are boron phosphide particles, the first substrate and the second substrate are polyvinyl alcohol, and the second film layer is a boron nitride nano sheet;
the weight of the boron nitride nano-sheet accounts for 1.8-2.7 wt% of the weight of the sandwich composite film, and the sum of the weight of the boron phosphide particles and the weight of the boron nitride nano-sheet accounts for 30.8-32 wt% of the weight of the sandwich composite film.
The sandwich composite film is provided with a first area and a second area, and the first area is arranged corresponding to the lamp beads; the boron phosphide particles having a first distributed content in the first region and a second distributed content in the second region; the boron nitride nano-sheet has third distribution content in the first area and fourth distribution content in the second area;
the first distribution content is greater than the second distribution content, and the third distribution content is equal to the fourth distribution content;
alternatively, the first distribution content is equal to the second distribution content, and the third distribution content is greater than the fourth distribution content;
alternatively, the first distribution content is greater than the second distribution content and the third distribution content is greater than the fourth distribution content.
Wherein the sandwich composite membrane comprises:
the light bulb comprises a plurality of sub-sandwich composite films, wherein each sub-sandwich composite film corresponds to one light bulb, and different sub-sandwich composite films correspond to different light bulbs.
The orthographic projection of the lamp beads on the sandwich composite film falls into the sub-sandwich composite film, and the surface area of the sub-sandwich composite film facing the lamp beads is 100% -150% of the orthographic projection of the lamp beads on the sandwich composite film.
Wherein, backlight unit still includes:
the heat conduction film is arranged between the lamp panel and the backboard, and is arranged between the two adjacent sandwich composite films.
Wherein, backlight unit still includes:
and the heat-conducting glue is arranged between the sandwich composite film and the lamp panel and is used for bonding the sandwich composite film and the lamp panel.
Wherein the back plate comprises:
a sidewall for carrying the light emitting assembly; and
The bottom wall is connected with the side wall in a bending way;
the backlight module further comprises a reflecting sheet, a light guide plate and an optical film which are sequentially stacked, wherein the reflecting sheet is arranged close to the bottom wall compared with the light guide plate, and the light guide plate is arranged corresponding to the lamp beads;
the sandwich composite film is arranged between the side wall and the lamp panel, or between the side wall and the lamp panel, and between the bottom wall and the light guide plate.
Wherein the sandwich composite membrane comprises:
the main body film is arranged between the lamp panel and the backboard; and
The extension film is arranged at the end part of the backboard and is connected with the main body film in a bending way so as to wrap the backboard.
According to the backlight module, the sandwich composite film is arranged between the back plate and the lamp panel, the sandwich composite film comprises the first film layer, the second film layer and the third film layer which are sequentially stacked, the first heat dissipation paths formed by connecting the first heat dissipation particles in the first film layer and the second heat dissipation paths formed by connecting the second heat dissipation particles in the third film layer improve the in-plane heat conductivity of the sandwich composite film, the first heat dissipation particles in the first film layer and the second heat dissipation particles in the third film layer respectively form the third heat dissipation paths and the fourth heat dissipation paths with the second film layer, the heat conductivity of the sandwich composite film in the stacking direction is improved, so that the heat dissipation capacity of the backlight module is improved, and the second film layer serving as an insulating layer blocks electronic conversion, the electric insulation property of the sandwich composite film is improved, and the electric insulation property of the backlight module at the back plate is improved. Therefore, the backlight module provided by the application has good heat dissipation capacity and electrical insulation performance at the back plate.
In a second aspect, the present application also provides a display device including:
a housing;
a display panel carried by the housing; and
The backlight module of the first aspect, wherein the backlight module is carried on the housing, and the backlight module is configured to emit light to the display panel.
The display device provided by the application provides good heat dissipation capability and electrical insulation property for the display panel and the light-emitting component through the sandwich composite film, so that the heat dissipation capability of the display panel is improved, the display effect, the display performance and the display quality of the display panel are improved, the service life of the display panel is prolonged, the cost performance of the display device is improved, and the experience and satisfaction of users are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
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 structural diagram of a backlight module according to a second embodiment of the present application;
FIG. 3 is a schematic structural diagram of the sandwich composite membrane of FIGS. 1 and 2;
FIG. 4 is a schematic view of a partition of the sandwich composite membrane of FIG. 2;
fig. 5 is a schematic structural diagram of a backlight module according to a third embodiment of the present application;
fig. 6 is a schematic structural diagram of a backlight module according to a fourth embodiment of the present application;
FIG. 7 is a schematic top view of the backlight module of FIG. 2;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the application.
Reference numerals: a display device 1; a backlight module 10; a back plate 11; a sidewall 111; a bottom wall 112; a light emitting assembly 12; a lamp panel 121; a lamp bead 122; a sandwich composite membrane 13; a first film layer 131; first heat dissipation particles 1311; a third heat dissipation path 1312; a first substrate 1313; a first heat dissipation path 1314; a second film layer 132; a third film layer 133; second heat dissipation particles 1321; a fourth heat dissipation path 1322; a second substrate 1323; second heat dissipation path 1324; a first region 134; a second region 135; a sub-sandwich composite membrane 136; a body film 137; an extension film 138; a heat conductive film 14; a heat conductive adhesive 15; a reflection sheet 16; a light guide plate 17; an optical film 18; a housing 20; and a display panel 30.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" or "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the application. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The application provides a backlight module 10. Referring to fig. 1, fig. 2 and fig. 3, 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 structural diagram of a backlight module according to a second embodiment of the present application;
fig. 3 is a schematic structural diagram of the sandwich composite membrane of fig. 1 and 2. In this embodiment, the backlight module 10 includes a back plate 11 and a light emitting component 12. The light emitting component 12 is carried by the back plate 11. The light emitting assembly 12 includes a lamp panel 121 and a plurality of lamp beads 122. The plurality of lamp beads 122 are disposed on the lamp panel 121 at intervals. The backlight module 10 includes a sandwich composite film 13. The sandwich composite film 13 is disposed between the back plate 11 and the lamp panel 121. The sandwich composite membrane 13 includes a first membrane layer 131, a second membrane layer 132, and a third membrane layer 133 that are sequentially stacked. The first film layer 131 includes a plurality of first heat dissipation particles 1311. The second film 132 is an insulating layer. The third film 133 includes a plurality of second heat dissipating particles 1321. The first heat dissipation particles 1311 are connected to form a first heat dissipation path 1314, the second heat dissipation particles 1321 are connected to form a second heat dissipation path 1324, and a third heat dissipation path 1312 is formed between the first heat dissipation particles 1311 and the second film 132. A plurality of fourth heat dissipation paths 1322 are formed between the plurality of second heat dissipation particles 1321 and the second film 132.
In this embodiment, the backlight module 10 is applied to a display device having a backlight display, such as a mobile phone, a tablet computer, a notebook computer, a palm top computer, a personal computer (Personal Computer, PC), a personal digital assistant (Personal Digital Assistant, PDA), and the like.
In this embodiment, the sandwich composite film 13 includes a first film layer 131, a second film layer 132, and a third film layer 133 that are sequentially stacked. The first film layer 131 includes a plurality of first heat dissipation particles 1311, the plurality of first heat dissipation particles 1311 are connected to form a first heat dissipation path 1314, and the first heat dissipation paths 1314 are distributed along an extending direction of the first film layer 131, so that heat dissipation is achieved by conducting heat in a plane of the first film layer 131 through the first heat dissipation paths 1314. And a plurality of third heat dissipation paths 1312 are formed between the plurality of first heat dissipation particles 1311 and the second film 132 to dissipate heat through the plurality of third heat dissipation paths 1312. The third film 133 includes a plurality of second heat dissipation particles 1321, where the second heat dissipation particles 1321 are connected to form a second heat dissipation path 1324, and the second heat dissipation paths 1324 are distributed along the extending direction of the third film 133, so as to implement heat dissipation through in-plane heat conduction of the second heat dissipation path 1324 in the third film 133. And a plurality of fourth heat dissipation paths 1322 are formed between the second heat dissipation particles 1321 and the second film 132 to dissipate heat through the fourth heat dissipation paths 1322. The first heat dissipation path 1314, the second heat dissipation path 1324, the plurality of third heat dissipation paths 1312, and the plurality of fourth heat dissipation paths 1322 combine to increase the heat dissipation capacity of the sandwich composite film 13. Therefore, the sandwich composite film 13 is disposed between the back plate 11 and the lamp panel 121, on one hand, heat is conducted in the surface of the first film 131 through the first heat dissipation path 1314, and heat in the first film 131 is dissipated through the end surface of the first film 131 facing away from the light emitting component 12. On the other hand, heat is conducted from the first film layer 131 to the third film layer 133 and transferred to the back plate 11 through the plurality of third heat dissipation paths 1312 and the plurality of fourth heat dissipation paths 1322 in order, thereby dissipating heat toward the outside of the backlight module 10. In yet another aspect, heat is conducted through the second heat dissipation path 1324 in the plane of the third film 133, so as to dissipate heat conducted to the third film 133 through the end face of the third film 133 facing away from the light emitting assembly 12. Therefore, the sandwich composite film 13 has high in-plane heat conductivity and good heat dissipation effect. Meanwhile, the second film 132 is an insulating layer, and the second film 132 blocks the electronic conversion, so that the resistivity of the sandwich composite film 13 is improved, and the sandwich composite film 13 has better electrical insulation performance. Therefore, the sandwich composite film 13 has both good heat dissipation capability and good electrical insulation, thereby improving the heat dissipation capability of the backlight module 10. When the backlight module 10 is used in combination with the display panel 30, since the backlight module 10 has good heat dissipation capability, part of heat generated by the operation of the display panel 30 can be conducted to the outside through the sandwich composite heat conduction, and the heat generated by the operation of the light emitting component 12 is reduced to be transferred to the display panel 30, so that the display effect, the display performance and the display quality of the display panel 30 are improved, the service lives of the backlight module 10 and the display panel 30 are prolonged, the cost performance is improved, and the experience and the satisfaction of a user are further improved. The first film 131 is disposed closer to the lamp panel 121 than the second film 132, so the first film 131 is also called a top film. The third film 133 is disposed away from the lamp panel 121 as compared to the second film 132, and thus the third film 133 is also referred to as a base film. The second film 132 is disposed between the first film 131 and the third film 133, and thus the second film 132 is also referred to as an intermediate layer. The sandwich composite film 13 is a sandwich structure, also called a sandwich structure, in which the middle layer is electrically insulated, the top film and the bottom film dissipate heat, and a plurality of heat dissipation channels are formed by the top film and the bottom film respectively.
Optionally, the first heat dissipation paths 1314 formed by connecting the plurality of first heat dissipation particles 1311 may be one or more, and when the number of the first heat dissipation paths 1314 is plural, two adjacent first heat dissipation paths 1314 in the plurality of first heat dissipation paths 1314 are connected and at least partially overlap, so as to improve the in-plane heat conduction effect of the first film layer 131.
Optionally, one or more second heat dissipation paths 1324 formed by connecting the plurality of second heat dissipation particles 1321 may be provided, where when the number of the second heat dissipation paths 1324 is plural, two adjacent second heat dissipation paths 1324 in the plurality of second heat dissipation paths 1324 are connected and at least partially overlap, so as to improve the in-plane heat conduction effect of the third film layer 133.
In this embodiment, the first heat dissipation particles 1311 are particles having a heat dissipation function, and the first heat dissipation particles 1311 can form the plurality of third heat dissipation paths 1312 with the second film layer 132, and the third heat dissipation paths 1312 are also referred to as heat dissipation channels. The second heat dissipation particles 1321 are particles having a heat dissipation function, and the second heat dissipation particles 1321 can form a plurality of fourth heat dissipation paths 1322 with the second film 132, and the fourth heat dissipation paths 1322 are also called heat dissipation channels. The second film 132 is an insulating layer having electrical insulation properties.
Optionally, the first heat dissipation particles 1311 and the second heat dissipation particles 1321 are made of the same type of material, or different types of materials, so long as the heat dissipation function can be achieved, and a heat dissipation channel is formed with the second film 132.
Optionally, the thickness of the sandwich composite film 13 is 5 μm-20 μm, so that the sandwich composite film 13 has better heat dissipation capability and electrical insulation property. For example, the thickness of the sandwich composite membrane 13 may be, but is not limited to, other values of 5 μm, or 7 μm, or 10 μm, or 13 μm, or 16 μm, or 18 μm, or 20 μm, or 5 μm to 20 μm.
Alternatively, the backlight module 10 is a side-in backlight (see fig. 1) or a direct-down backlight (see fig. 2).
It should be noted that, in fig. 3, the number of the first heat dissipation particles 1311, the number of the second heat dissipation particles 1321, the connection form of the first heat dissipation paths 1314, the connection form of the second heat dissipation paths 1324, the number and the length of the plurality of third heat dissipation paths 1312, and the number and the length of the plurality of fourth heat dissipation paths 1322 are only schematically described, and it should be understood that fig. 3 does not limit the specific form of the heat dissipation paths in the sandwich composite film 13, as long as the heat conduction in the plane of the first film layer 131, the heat conduction in the plane of the third film layer 133, and the heat conduction in the lamination direction of the first film layer 131, the second film layer 132, and the third film layer 133 can be achieved.
In summary, in the backlight module 10 provided by the present application, the sandwich composite film 13 is disposed between the back plate 11 and the lamp plate 121, the sandwich composite film 13 includes the first film layer 131, the second film layer 132 and the third film layer 133 that are sequentially stacked, the first heat dissipation paths 1314 formed by connecting the plurality of first heat dissipation particles 1311 in the first film layer 131 and the second heat dissipation paths 1324 formed by connecting the plurality of second heat dissipation particles 1321 in the third film layer 133 increase the in-plane heat conductivity of the sandwich composite film 13, and the plurality of first heat dissipation particles 1311 in the first film layer 131 and the plurality of second heat dissipation particles 1321 in the third film layer 133 and the second film layer 132 form the plurality of third heat dissipation paths 1312 and the plurality of fourth heat dissipation paths 1322, respectively, so that the heat dissipation capability of the backlight module 10 is increased, and the electrical insulation property of the back plate 10 is increased by blocking the second film layer 132 for the insulating layer, so that the electrical insulation performance of the backlight module 10 is increased. Therefore, the backlight module 10 provided by the application has good heat dissipation capability and electrical insulation performance at the back plate 11.
Referring to fig. 3 again, in the present embodiment, the first film layer 131 further includes a first substrate 1313. The first heat dissipation particles 1311 are distributed in the first substrate 1313. The third film 133 further includes a second substrate 1323. The second heat dissipation particles 1321 are distributed in the second substrate 1323. The first heat sink particles 1311 and the second heat sink particles 1321 are Boron Phosphide (BP) particles. The first substrate 1313 and the second substrate 1323 are polyvinyl alcohol (Polyvinyl Alcohol, PVA). The second film 132 is a Boron Nitride Nano Sheet (BNNS). The weight of the boron nitride nano-sheets accounts for 1.8-2.7 wt% of the weight of the sandwich composite film 13, and the sum of the weight of the boron phosphide particles and the weight of the boron nitride nano-sheets accounts for 30.8-32 wt% of the weight of the sandwich composite film 13.
In this embodiment, the sandwich composite film 13 is referred to as a polyvinyl alcohol (PVA)/Boron Phosphide (BP) -boron nitride nano-sheet (BNNS) composite material, also referred to as a PVA/BP-BNNS composite film. In the first film layer 131, the plurality of first heat dissipation particles 1311 are connected to each other to form the first heat dissipation path 1314, and in the third film layer 133, the plurality of second heat dissipation particles 1321 are connected to each other to form the second heat dissipation path 1324, which improves the in-plane thermal conductivity of the PVA/BP-BNNS composite film. Further, after the PVA/BP and BNNS constitute the sandwich structure, the plurality of heat dissipation paths formed between the interconnected BP particles and BNNS to connect the first film layer 131, the second film layer 132, and the third film layer 133 increase the heat conductivity, so that in the direction in which the light emitting component 12 points to the back plate 11, the heat conductivity in the lamination direction of the PVA/BP-BNNS composite film is increased, thereby increasing the heat conductivity of the sandwich composite film 13, and further increasing the heat dissipation capability of the sandwich composite film 13. While the insulating BNNS blocks the electron conversion, thereby increasing the resistivity of the sandwich composite film 13.
Optionally, a fifth heat dissipation path is formed by connecting a plurality of Boron Nitride (BN) molecules in the BNNS, so as to realize in-plane heat conduction in the second film layer 132 through the fifth heat dissipation path, thereby further improving the heat dissipation capability of the sandwich composite film 13.
Further, when BNNS accounts for 1.8wt% -2.7wt% of the PVA/BP-BNNS composite film, and the sum of the weight of BP particles and BNNS (i.e. the total filling amount) accounts for 30.8wt% -32wt% of the PVA/BP-BNNS composite film, the thermal conductivity and the electrical resistivity of the sandwich composite film 13 can be better. Wherein, as the weight percentage of the BNNS in the PVA/BP-BNNS composite film increases, the higher the blocking effect of the second film layer 132 on the electron conduction, the lower the dielectric constant of the sandwich composite film 13, i.e. the better the electrical insulation performance of the sandwich composite film 13. For example, the weight percent of BNS to PVA/BP-BNS composite film may be, but is not limited to, 1.8wt%, or 2.0wt%, or 2.2wt%, or 2.4wt%, or 2.6wt%, or 2.7wt%, or other values between 1.8wt% and 2.7 wt%. The weight sum of BP particles and BNNS can be, but is not limited to, 30.8wt%, or 31.0wt%, or 31.2wt%, or 31.4wt%, or 31.6wt%, or 31.8wt%, or 32wt%, or other values between 30.8wt% and 32wt% of the PVA/BP-BNNS composite film.
Optionally, the first heat sink particles 1311 and the second heat sink particles 1321 are modified BP particles.
Optionally, the first heat dissipation particles 1311 are uniformly distributed within the first substrate 1313, and the second heat dissipation particles 1321 are uniformly distributed within the second substrate 1323.
Referring to fig. 3 and 4, fig. 4 is a schematic diagram of the sandwich composite membrane of fig. 2. The sandwich composite membrane 13 has a first region 134 and a second region 135. The first region 134 is disposed corresponding to the lamp bead 122. The boron phosphide particles have a first distributed content in the first region 134 and a second distributed content in the second region 135. The boron nitride nanoplatelets have a third distribution of content in the first region 134 and a fourth distribution of content in the second region 135. The first distribution content is greater than the second distribution content, and the third distribution content is equal to the fourth distribution content. Alternatively, the first distribution content is equal to the second distribution content and the third distribution content is greater than the fourth distribution content. Alternatively, the first distribution content is greater than the second distribution content and the third distribution content is greater than the fourth distribution content. It should be noted that, in fig. 4, the sandwich composite film 13 in the embodiment of fig. 2 is exemplified as a partition schematic, and it is to be understood that the sandwich composite film 13 in the embodiment of fig. 1 may be partitioned in the same partition manner, and fig. 4 is merely illustrative and not limiting.
In this embodiment, the heat emitted at the bead 122 is higher than that of other areas when the light emitting component 12 is in operation, that is, the heat emitted at the first area 134 is higher than that of the second area 135 when the light emitting component 12 is in operation, and the sandwich composite film 13 provides more third heat dissipation paths 1312 and fourth heat dissipation paths 1322 in the first area 134 than in the second area 135, so that the heat dissipation effect of the sandwich composite film 13 in the first area 134 is better, and the heat dissipation pertinence of the sandwich composite film 13 is better, and the backlight module 10 presents a more uniform temperature in the back plate 11.
Specifically, in an embodiment, the first distribution content is greater than the second distribution content, and the third distribution content is equal to the fourth distribution content, so that the content of BP particles in the first region 134 is greater than the content of BP particles in the second region 135, so that the sum of the numbers of the third heat dissipation paths 1312 and the fourth heat dissipation paths 1322 in the first region 134 is greater than the sum of the numbers of the third heat dissipation paths 1312 and the fourth heat dissipation paths 1322 in the second region 135, and thus the heat dissipation effect of the sandwich composite film 13 in the first region 134 is better than that of the second region 135. In another embodiment, the first distribution content is equal to the second distribution content and the third distribution content is greater than the fourth distribution content, such that the content of BNNS in the first region 134 is greater than the content of BNNS in the second region 135, such that the first region 134 is able to form more BNNS with BP particles in the third heat dissipation path 1312 and the fourth heat dissipation path 1322, such that the sum of the number of third heat dissipation paths 1312 and the fourth heat dissipation paths 1322 in the first region 134 is greater than the sum of the number of third heat dissipation paths 1312 and the fourth heat dissipation paths 1322 in the second region 135, thereby achieving a better heat dissipation effect of the sandwich composite film 13 in the first region 134 than in the second region 135, and further, such that the sandwich composite film 13 has better electrical insulation against the lamp 122 than the second region 135, due to the greater content of BNNS in the first region 134 than in the second region 135. In yet another embodiment, the first distribution content is greater than the second distribution content and the third distribution content is greater than the fourth distribution content, such that the content of BP particles in the first region 134 is greater than the content of BP particles in the second region 135 and the content of BNNS in the first region 134 is greater than the content of BNNS in the second region 135, such that the sum of the number of the third heat dissipation path 1312 and the fourth heat dissipation path 1322 in the first region 134 is greater than the sum of the number of the third heat dissipation path 1312 and the fourth heat dissipation path 1322 in the second region 135, thereby achieving a better heat dissipation effect of the sandwich composite film 13 in the first region 134 than the second region 135, and further, such that the sandwich composite film 13 has better electrical insulation properties to the backsheet 11 than the second region 135.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a backlight module according to a third embodiment of the application. In this embodiment, the sandwich composite membrane 13 includes a plurality of sub-sandwich composite membranes 136. Each of the sub-sandwich composite films 136 is disposed corresponding to one of the beads 122, and different ones of the sub-sandwich composite films 136 are disposed corresponding to different ones of the beads 122. It should be noted that, in fig. 5, a direct type backlight is illustrated in the embodiment of fig. 2, and it should be understood that the side-entry type backlight in the embodiment of fig. 1 may employ the same arrangement of the sub-sandwich composite film 136, and fig. 5 is merely illustrative and not limiting.
In this embodiment, the heat emitted by the bead 122 is significantly higher than that of other areas when the light emitting component 12 works, the sandwich composite film 13 is only disposed between the bead 122 and the back plate 11, that is, each of the sub-sandwich composite films 136 is disposed corresponding to one of the beads 122, so that the heat is dissipated and electrically insulated in a region of the light emitting component 12 that is most prone to heat, and the heat dissipation efficiency is high and the material cost of the sandwich composite film 13 is saved.
Further, the orthographic projection of the lamp beads 122 on the sandwich composite film 13 falls into the sub-sandwich composite film 136, and the surface area of the sub-sandwich composite film 136 facing the lamp beads 122 is 100% -150% of the orthographic projection area of the lamp beads 122 on the sandwich composite film 13, so that each sub-sandwich composite film 136 can correspondingly cover one lamp bead 122 in the direction of the back plate 11 pointing to the light emitting component 12, and heat dissipation of each sub-sandwich composite film 136 to the corresponding lamp bead 122 is improved. For example, the surface area of the sub-sandwich composite film 136 facing the lamp beads 122 is 100%, or 110%, or 120%, or 130%, or 140%, or 150%, or other value between 100% and 150% of the area of the orthographic projection of the lamp beads 122 onto the sandwich composite film 13. If the surface area of the sub-sandwich composite film 136 facing the lamp beads 122 is smaller than 100% of the area of the orthographic projection of the lamp beads 122 on the sandwich composite film 13, each sub-sandwich composite film 136 cannot cover the corresponding lamp beads 122 in the direction of the back plate 11 pointing to the light emitting assembly 12, so that the heat generated by the lamp beads 122 cannot be better covered, and the heat generated by the lamp beads 122 escapes, resulting in poor heat dissipation effect. If the ratio of each of the sub-sandwich composite films 136 is greater than 150% in the direction in which the back plate 11 points to the light emitting component 12, the coverage area of the sub-sandwich composite film 136 is too wide, and the heat dissipation effect of the further improvement of the portion of the sub-sandwich composite film 136 with the ratio exceeding 150% is not obvious or is not further improved, which is not cost-effective for increasing the material cost of the sandwich composite film 13. Therefore, the surface area of the sub-sandwich composite film 136 facing the lamp beads 122 is 100% -150% of the orthographic projection area of the lamp beads 122 on the sandwich composite film 13, so that the heat dissipation effect of each sub-sandwich composite film 136 on the corresponding lamp beads 122 is improved, and the material cost of the sandwich composite film 13 is saved.
In addition, the backlight module 10 further includes a heat conductive film 14. The heat conducting film 14 is disposed between the lamp panel 121 and the back plate 11, and disposed between two adjacent sub-sandwich composite films 136, so as to dissipate heat between the lamp panel 121 and the back plate 11 in a region not covered by the sandwich composite film 13, thereby increasing the heat dissipation effect.
Alternatively, the heat conductive film 14 may be, but is not limited to, a phase change heat conductive insulating material, or a heat conductive tape, or a heat conductive insulating elastic rubber, or a flexible heat conductive pad, or a heat conductive filler, etc.
Referring to fig. 1 and 2 again, in the present embodiment, the backlight module 10 further includes a heat-conducting adhesive 15. The heat-conducting glue 15 is disposed between the sandwich composite film 13 and the lamp panel 121, and is used for bonding the sandwich composite film 13 and the lamp panel 121.
In this embodiment, the heat-conducting glue 15 not only can bond the sandwich composite film 13 to the lamp panel 121, so that the bonding degree of the sandwich composite film 13 and the lamp panel 121 is better, and the heat conducted by the sandwich composite film 13 to the lamp panel 121 is better, but also can be conducted to the sandwich composite film 13, so that the heat at the position of the sandwich composite film 13 dissipates heat.
Referring to fig. 1 and fig. 6, fig. 6 is a schematic structural diagram of a backlight module according to a fourth embodiment of the present application. In this embodiment, the back plate 11 includes a side wall 111 and a bottom wall 112. The side wall 111 is used for carrying the light emitting assembly 12. The bottom wall 112 is connected to the side wall 111 by bending. The backlight module 10 further includes a reflective sheet 16, a light guide plate 17, and an optical film 18, which are sequentially stacked. The reflecting sheet 16 is disposed closer to the bottom wall 112 than the light guide plate 17. The light guide plate 17 is disposed corresponding to the lamp beads 122. The sandwich composite film 13 is disposed between the side wall 111 and the lamp panel 121. Or, the sandwich composite film 13 is disposed between the side wall 111 and the lamp panel 121, and between the bottom wall 112 and the light guide plate 17.
In this embodiment, the backlight module 10 is a side-in backlight. The light emitting component 12 is disposed on the side wall 111, and the light panel 121 is also referred to herein as a light bar because the light panel 121 is narrower due to the smaller space of the side wall 111. The sandwich composite film 13 is disposed between the side wall 111 and the lamp panel 121 to dissipate heat of the light emitting component 12. Or, the sandwich composite film 13 is disposed between the side wall 111 and the lamp panel 121 and between the bottom wall 112 and the light guide plate 17, so as to radiate heat in the area of the backlight module 10 at the bottom wall 112, thereby improving the heat radiation area of the sandwich composite film 13 at the backlight module 10 and further improving the heat radiation effect of the backlight module 10.
In this embodiment, the lamp beads 122 are opposite to the light guide plate 17 to emit light, and the light is reflected and diffused in the light guide plate 17, where the reflecting sheet 16 is disposed on a surface of the light guide plate 17 facing away from the optical film 18, so as to improve the effect of reflecting the light by the light guide plate 17, and the light guide plate 17 is configured to guide the light to the optical film 18, diffuse and uniformly emit the light via the optical film 18, and improve the texture of the light.
Optionally, the sandwich composite film 13 wraps the end of the side wall 111 and the end of the bottom wall 112, so that the sandwich composite film 13 better fits the back plate 11, thereby improving the heat conduction effect between the sandwich composite film 13 and the back plate 11, and facilitating the heat dissipation of the backlight module 10.
Optionally, the optical film 18 is at least one of a diffusion sheet and a prism sheet, so as to diffuse the light emitted from the light guide plate 17 after the light beads 122 are transmitted to the light guide plate 17, thereby improving the light emitting effect of the backlight module 10.
Optionally, the optical film 18 includes two diffusion sheets and one prism sheet, and the prism sheet is disposed between the two diffusion sheets, so as to further improve the light-emitting effect of the backlight module 10.
Referring to fig. 2 and 7, fig. 7 is a schematic top view of the backlight module in fig. 2. In this embodiment, the sandwich composite membrane 13 includes a main membrane 137 and an extension membrane 138. The main body film 137 is disposed between the lamp panel 121 and the back plate 11. The extension film 138 is disposed at an end of the back plate 11 and is bent and connected with the main film 137 to wrap the back plate 11.
In this embodiment, the backlight module 10 is a direct type backlight. The main film 137 is used for dissipating heat at the lamp panel 121, and the extension film 138 wraps the end of the back plate 11, so that the sandwich composite film 13 is better attached to the back plate 11, thereby improving the heat conduction effect of the sandwich composite film 13 and the back plate 11, being beneficial to dissipating heat of the backlight module 10, and enabling the heat dissipating surface of the sandwich composite film 13 in the backlight module 10 to be larger, improving the heat dissipating area, and further improving the heat dissipating effect.
In addition, the extension film 138 can directly dissipate heat from the end surface of the extension film 138 facing away from the light emitting component 12 through in-plane heat conduction, so that the heat dissipation effect of the sandwich composite film 13 is further improved without transferring the heat to the outside of the backlight module 10 through the back plate 11.
Optionally, the backlight module 10 further includes a reflective film, where the reflective film is disposed on a surface of the lamp panel 121 bearing the lamp beads 122, and the reflective film is disposed avoiding the lamp beads 122, so as to improve the effect of emitting light from the light emitting assembly 12.
The application also provides a display device 1. Referring to fig. 1 and 8, fig. 8 is a schematic structural diagram of a display device according to an embodiment of the application. In this embodiment, the display device 1 includes a housing 20, a display panel 30, and the backlight module 10 provided in any of the foregoing embodiments. The display panel 30 is carried by the housing 20. The backlight module 10 is carried on the housing 20, and the backlight module 10 is configured to emit light to the display panel 30.
In this embodiment, the display device 1 is a display apparatus, for example, a mobile phone, a tablet computer, a notebook computer, a palm computer, a PC, a PDA, or the like.
In this embodiment, the sandwich composite film 13 has good heat dissipation capability and electrical insulation property, so that good heat conductivity and electrical insulation property can be provided for the display panel 30 and the light emitting component 12, thereby improving the heat dissipation capability of the display panel 30, being beneficial to improving the display effect, display performance and display quality of the display panel 30, further prolonging the service life of the display panel 30, improving the cost performance of the display device 1, and further improving the experience and satisfaction of users.
While embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and alternatives to the above embodiments may be made by those skilled in the art within the scope of the application, which is also to be regarded as being within the scope of the application.
Claims (10)
1. The utility model provides a backlight unit, includes backplate and light-emitting component, light-emitting component bear in the backplate, light-emitting component includes lamp plate and a plurality of lamp pearl, a plurality of lamp pearl intervals set up in on the lamp plate, its characterized in that, backlight unit includes:
the sandwich composite film is arranged between the back plate and the lamp panel, the sandwich composite film comprises a first film layer, a second film layer and a third film layer which are sequentially laminated, the first film layer comprises a plurality of first heat dissipation particles, the first heat dissipation particles are connected to form a first heat dissipation path, the second film layer is an insulating layer, the third film layer comprises a plurality of second heat dissipation particles, the second heat dissipation particles are connected to form a second heat dissipation path, a plurality of third heat dissipation paths are formed between the first heat dissipation particles and the second film layer, and a plurality of fourth heat dissipation paths are formed between the second heat dissipation particles and the second film layer.
2. The backlight module of claim 1, wherein the first film layer further comprises a first substrate, the first heat dissipation particles are distributed in the first substrate, the third film layer further comprises a second substrate, the second heat dissipation particles are distributed in the second substrate, the first heat dissipation particles and the second heat dissipation particles are boron phosphide particles, the first substrate and the second substrate are polyvinyl alcohol, and the second film layer is boron nitride nanosheets;
the weight of the boron nitride nano-sheet accounts for 1.8-2.7 wt% of the weight of the sandwich composite film, and the sum of the weight of the boron phosphide particles and the weight of the boron nitride nano-sheet accounts for 30.8-32 wt% of the weight of the sandwich composite film.
3. The backlight module of claim 2, wherein the sandwich composite film has a first region and a second region, the first region being disposed corresponding to the beads; the boron phosphide particles having a first distributed content in the first region and a second distributed content in the second region; the boron nitride nano-sheet has third distribution content in the first area and fourth distribution content in the second area;
the first distribution content is greater than the second distribution content, and the third distribution content is equal to the fourth distribution content;
alternatively, the first distribution content is equal to the second distribution content, and the third distribution content is greater than the fourth distribution content;
alternatively, the first distribution content is greater than the second distribution content and the third distribution content is greater than the fourth distribution content.
4. The backlight module of claim 1, wherein the sandwich composite film comprises:
the light bulb comprises a plurality of sub-sandwich composite films, wherein each sub-sandwich composite film corresponds to one light bulb, and different sub-sandwich composite films correspond to different light bulbs.
5. The backlight module of claim 4, wherein the orthographic projection of the lamp beads on the sandwich composite film falls within the sub-sandwich composite film, and the surface area of the sub-sandwich composite film facing the lamp beads is 100% -150% of the orthographic projection of the lamp beads on the sandwich composite film.
6. The backlight module according to claim 4, further comprising:
the heat conduction film is arranged between the lamp panel and the backboard, and is arranged between the two adjacent sandwich composite films.
7. The backlight module according to claim 1, wherein the backlight module further comprises:
and the heat-conducting glue is arranged between the sandwich composite film and the lamp panel and is used for bonding the sandwich composite film and the lamp panel.
8. The backlight module according to any one of claims 1 to 7, wherein the back plate comprises:
a sidewall for carrying the light emitting assembly; and
The bottom wall is connected with the side wall in a bending way;
the backlight module further comprises a reflecting sheet, a light guide plate and an optical film which are sequentially stacked, wherein the reflecting sheet is arranged close to the bottom wall compared with the light guide plate, and the light guide plate is arranged corresponding to the lamp beads;
the sandwich composite film is arranged between the side wall and the lamp panel, or between the side wall and the lamp panel, and between the bottom wall and the light guide plate.
9. The backlight module according to any one of claims 1 to 7, wherein the sandwich composite film comprises:
the main body film is arranged between the lamp panel and the backboard; and
The extension film is arranged at the end part of the backboard and is connected with the main body film in a bending way so as to wrap the backboard.
10. A display device, characterized in that the display device comprises:
a housing;
a display panel carried by the housing; and
The backlight module according to any one of claims 1-9, wherein the backlight module is carried by the housing and is configured to emit light to the display panel.
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| CN202310484929.5A CN116592319A (en) | 2023-04-28 | 2023-04-28 | Backlight module and display device |
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| CN202310484929.5A CN116592319A (en) | 2023-04-28 | 2023-04-28 | Backlight module and display device |
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