WO2019056810A1 - 背光模组以及显示装置 - Google Patents

背光模组以及显示装置 Download PDF

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Publication number
WO2019056810A1
WO2019056810A1 PCT/CN2018/090926 CN2018090926W WO2019056810A1 WO 2019056810 A1 WO2019056810 A1 WO 2019056810A1 CN 2018090926 W CN2018090926 W CN 2018090926W WO 2019056810 A1 WO2019056810 A1 WO 2019056810A1
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WO
WIPO (PCT)
Prior art keywords
backlight module
heat sink
reflective sheet
plastic frame
present disclosure
Prior art date
Application number
PCT/CN2018/090926
Other languages
English (en)
French (fr)
Inventor
吕红亮
王博宁
刘宇飞
杜育锋
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Publication date
Application filed by 京东方科技集团股份有限公司, 北京京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US16/333,881 priority Critical patent/US11294229B2/en
Publication of WO2019056810A1 publication Critical patent/WO2019056810A1/zh

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    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • F21V29/85—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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0085—Means for removing heat created by the light source from the package
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • 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
    • G02F1/133628—Illuminating devices with cooling means

Definitions

  • the present disclosure relates to the field of display technology.
  • a backlight module includes: a heat sink; a plastic frame fixed to the heat sink and surrounding an area on the heat sink; and a reflective sheet, the reflective sheet Provided in the region surrounded by the plastic frame such that the reflective sheet can move relative to the heat sink.
  • the material of the heat sink is natural graphite, synthetic graphite, copper foil, aluminum foil or a thermally conductive silicone film.
  • the inner side wall of the plastic frame is provided with a snap portion, and the reflective sheet is snapped onto the snap portion.
  • the snap portion includes a plurality of card slots
  • the reflective sheet has a plurality of protrusions, each of which is snapped into a corresponding card slot.
  • an adhesive layer is disposed on a bottom surface of the plastic frame, and the heat sink is fixed to the plastic frame by the adhesive layer.
  • the width of the bonding layer is no greater than the width of the bottom surface of the bezel.
  • the bonding layer is a square-shaped double-sided tape.
  • the backlight module further includes: a light source disposed on a side of the reflective sheet away from the heat sink.
  • an orthographic projection of the light source on the heat sink is located within an orthographic projection of the reflective sheet on the heat sink.
  • the backlight module further includes: a light guide plate on a side of the reflective sheet away from the heat sink.
  • the backlight module further includes: an optical film layer, the optical film layer being located on a side of the light guide plate away from the reflective sheet.
  • the heat sink is directly bonded to the plastic frame.
  • a display device including the above-described backlight module according to the present disclosure is provided.
  • FIG. 1 is a schematic structural view of a backlight module according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural view of a related art backlight module
  • FIG. 3 is a schematic structural view of a backlight module according to an embodiment of the present disclosure.
  • Figure 4 shows a plan view of the area A in Figure 3;
  • FIG. 5 is a schematic structural view of a backlight module according to an embodiment of the present disclosure.
  • FIG. 6 shows a top view of a portion of a structure of a backlight module in accordance with an embodiment of the present disclosure.
  • the current backlight module generally has optical defects such as wrinkles and Newton rings caused by the warpage of the reflective sheet in the backlight module.
  • the inventors have conducted in-depth research and a large number of experiments and found that this is mainly due to the inconsistency in the flatness between the heat-dissipating film and the reflecting sheet, and the shrinkage of the heat-dissipating film and the reflecting sheet is inconsistent when the temperature changes, thereby causing the warpage of the reflecting sheet. .
  • the number of backlight LEDs is increasing.
  • the power consumption of the LCD driver chip and the driver circuit is also increasing.
  • the backlight LED of the liquid crystal display device and the LCD driver chip are generally designed on the same side, and the heat dissipated by the two will have a superposition effect.
  • the above superposition effect further exacerbates the degree of warpage between the heat dissipating film and the reflecting sheet.
  • the number of LEDs is increased in order to increase the display brightness of the display device, so the above problem is difficult to solve by reducing the number of LEDs.
  • a heat dissipating film material is disposed in the backlight module to improve the heat dissipating effect, and the heat dissipating film material is directly attached to the reflection sheet through the double-sided tape.
  • the setting method can achieve a better heat dissipation effect, the damage of the LED and the driving chip caused by the heat superposition is alleviated, but the optical defects such as wrinkles and Newton rings caused by the warpage of the reflecting sheet cannot be alleviated.
  • the inventors have found that in the above arrangement, the heat-dissipating film and the reflection sheet are closely adhered to each other. Therefore, when the reflection sheet and the heat-dissipating film are expanded and deformed, the warpage of the reflection sheet is intensified, resulting in wrinkles, Newton rings, and the like. Severe optical defects increase.
  • the present disclosure provides a backlight module.
  • the backlight module includes: a plastic frame 100 , a heat sink 200 , and a reflective sheet 300 .
  • the heat sink 200 may be fixed to the bezel 100 (eg, bonded to the bezel 100) and form a box-shaped structure with the bezel 100. That is, the heat sink 200 includes an area surrounded by the bezel 100.
  • the reflection sheet 300 is disposed in a box-shaped structure, for example, the reflection sheet 300 is disposed in the above-described region of the heat sink 200, and the reflection sheet 300 may be moved relative to the heat sink 200.
  • the backlight module has at least one of the following advantages: the heat sink is not bonded to the reflective sheet, the warp sheet is prevented from warping, and the optical defects such as wrinkles and Newton rings are prevented; and the reflective sheet is disposed in the box-shaped structure, that is, Only in the above region of the heat sink 200, a reflective sheet is disposed, and the reflective sheet no longer extends under the plastic frame, so that the thickness of the backlight module can be reduced, which is lighter and thinner; the box-shaped structure can be used as an integral supporting structure of the backlight module.
  • the plastic frame 100 may be a mouth-shaped structure, and the bottom of the plastic frame 100 is fixed (eg, bonded) to the heat sink, that is, the heat sink 200 may be formed as a bottom surface, and the plastic frame may be formed.
  • the frame of 100 is a box-shaped structure of a ring frame (side wall), the inner side wall of the plastic frame 100, and the heat sink 200 define a receiving space of the box-shaped structure. That is to say, an area on the heat sink 200 is defined by the plastic frame 100, and the reflection sheet 300 is placed in the accommodating space of the box-shaped structure, and stacked on the bottom surface of the box-shaped structure formed by the heat sink. That is, the reflection sheet 300 is disposed in the above-described region of the heat sink 200.
  • the backlight module according to the embodiments of the present disclosure has the advantages of alleviating warpage of the reflective sheet, preventing optical defects such as wrinkles and Newton rings, and reducing the thickness of the module.
  • the reflective sheet 300 and the heat sink 200 are stacked on the bottom of the plastic frame 100, and the backlight module and the heat sink are used to form a backlight module.
  • FIG. 2 referring to FIG.
  • the heat sink 200 is actually a member that realizes support of other structures of the backlight module. Therefore, it is only necessary to fix the heat sink 200 through the adhesive layer 400 to the bottom of the plastic frame 100. Therefore, it is possible to avoid providing an adhesive between the heat sink 200 and the reflection sheet 300.
  • the reflective sheet is not bonded to the heat sink by the adhesive, so that the reflective sheet can move relative to the heat sink, even if the heat sink 200 and the reflective sheet 300 are heated and expanded, and the thermal expansion coefficients of the two films are inconsistent, Since the stress between the film causes warpage of the reflective sheet, optical defects can be prevented, and the heat sink is not directly bonded to the reflective sheet, and the thickness of the backlight module is reduced and made thinner.
  • the backlight module further includes a light guide plate 600 and an optical film layer 700.
  • the light guide plate 600 is disposed in the box-shaped structure and located on a side of the reflection sheet 300 away from the heat sink 200. Thereby, the performance of the backlight module can be further improved.
  • the specific arrangement of the light guide plate 600 is not particularly limited, and those skilled in the art can select according to actual conditions.
  • the light guide plate 600 may be snapped onto the inner side wall of the plastic frame 100.
  • the optical film layer 700 may also be disposed in the box-shaped structure and located on a side of the light guide plate 600 away from the reflective sheet 300.
  • the specific type of the optical film layer 700 is not particularly limited, and those skilled in the art can select according to actual needs.
  • the optical film layer 700 may be a structure in which a plurality of film layers are stacked, or may be a composite film layer.
  • the optical film layer 700 may specifically include an antireflection film, a prism film, a diffusion film, and the like to further improve the performance of the backlight module.
  • the specific arrangement manner of the optical film layer 700 is not particularly limited, and those skilled in the art can select according to actual needs.
  • the liquid crystal module 800 needs to be disposed on the light emitting side of the backlight module (the side close to the optical film layer 700), the thickness of the light guide plate 600 and the optical film layer 700 can be passed.
  • the design is such that it can be stacked in a box-shaped structure, and the upper portion is fixed by the liquid crystal module 800. Therefore, the optical film layer 700 and the light guide plate 600 can be stacked in order, and no adhesive connection is required.
  • the fixing manner between the heat sink 200 and the plastic frame 100 is not particularly limited. As long as the box-shaped structure can be configured, the heat sink 200 and the plastic frame 100 can be used to form a space for supporting other structures and can be supported. .
  • an adhesive layer 400 may be disposed on the bottom surface of the plastic frame 100, and the heat sink 200 is bonded to the plastic frame 100 through the adhesive layer 400. Thereby, the heat sink 200 is closely bonded to the bottom surface of the bezel 100, and the gap can be reduced to prevent light leakage.
  • the heat sink 200 may be bonded to the bottom of the plastic frame 100 through the adhesive layer 400, and the formed structure is a box-shaped structure.
  • the width of the bonding layer 400 is not greater than the width of the bottom surface of the bezel 100.
  • the adhesive layer 400 can be prevented from entering the plastic frame 100.
  • the specific type of the material forming the adhesive layer 400 is not particularly limited, and it is only required to be able to bond the bottom surface of the plastic frame 100 to the adhesive layer 400.
  • the adhesive layer 400 may be a double-sided tape. Specifically, the lip-shaped double-sided tape can be directly used as the adhesive layer 400. Thereby, the cost can be further reduced.
  • the specific manner in which the reflection sheet 300 is fixed in the plastic frame 100 is not particularly limited as long as the fixation of the reflection sheet 300 can be achieved.
  • a latching portion 110 may be disposed on the inner side wall of the plastic frame 100, and the reflective sheet 300 is snapped onto the latching portion 110.
  • the reflection sheet can be easily snap-fitted in the frame structure without bonding by an adhesive.
  • the engaging portion 110 includes a plurality of card slots, and the reflective sheet 300 has a plurality of convex portions 31 that cooperate with the card slots, and each of the protruding portions 31 is engaged in a corresponding card slot.
  • the backlight module further includes a light source 500.
  • the light source 500 is disposed in the box-shaped structure and located on a side of the reflection sheet 300 away from the heat sink 200. Thereby, the performance of the backlight module can be further improved.
  • the orthographic projection of the light source 500 on the heat sink 200 is located within the orthographic projection of the reflective sheet 300 on the heat sink. Thereby, the light emitted by the light source 500 can be better reflected by the reflection sheet 300 to improve the backlight brightness of the backlight module.
  • the present disclosure proposes a display device.
  • the display device includes the backlight module described above. Therefore, the display device can have all the features and advantages of the backlight module described above, and details are not described herein again.
  • the display device has at least one of the following advantages: the heat sink is not bonded to the reflective sheet, the warp sheet is prevented from warping, and the optical defects such as wrinkles and Newton rings are prevented; and the reflective sheet is disposed in the box-shaped structure.
  • the thickness of the display device can be reduced, and it is lighter and thinner; the box-shaped structure can be used as an integral support structure of the display device.
  • the description of the terms “one embodiment”, “another embodiment” or the like means that the specific features, structures, materials or characteristics described in connection with the embodiments are included in at least one embodiment of the present disclosure. .
  • the schematic representation of the above terms is not necessarily directed to the same embodiment or example.
  • the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.
  • various embodiments or examples described in the specification and features of various embodiments or examples may be combined and combined without departing from the scope of the invention.
  • the terms “first” and “second” are used for descriptive purposes only, and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

一种背光模组以及显示装置。背光模组包括：散热片（200）；胶框（100），固定到散热片（200）上并且包围散热片（200）上的区域；以及反射片（300），设置在由胶框（100）包围的区域中，使得反射片（300）可以相对于散热片（200）移动。

Description

背光模组以及显示装置
相关申请的交叉引用
本公开要求2017年9月20日递交的中国专利申请No.201721215198.0的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及显示技术领域。
背景技术
随着电子产品智能化程度的提高以及应用场合的增多，用户对电子产品中的显示屏尺寸以及亮度，特别是移动终端的显示屏，提出了更高的要求。
发明内容
在本公开的一个方面，提供了一种背光模组，包括：散热片；胶框，所述胶框固定到所述散热片上并且包围所述散热片上的区域；以及反射片，所述反射片设置在由所述胶框包围的所述区域中，使得所述反射片可以相对于所述散热片移动。
在根据本公开的一些实施例中，所述散热片以及所述反射片之间不具有粘结剂。
在根据本公开的一些实施例中，所述散热片的材料为天然石墨、人工合成石墨、铜箔、铝箔或者导热硅胶膜。
在根据本公开的一些实施例中，所述胶框的内侧壁设置有卡接部，所述反射片卡接在所述卡接部上。
在根据本公开的一些实施例中，所述卡接部包括多个卡槽，所述反射片具有多个凸起部，每个凸起部卡接在对应的卡槽中。
在根据本公开的一些实施例中，所述胶框的底面上设置有粘结层，所述散热片通过所述粘结层固定到所述胶框。
在根据本公开的一些实施例中，所述粘结层的宽度不大于所述胶框的所述底面的宽度。
在根据本公开的一些实施例中，所述粘结层为口字形双面胶。
在根据本公开的一些实施例中，背光模组进一步包括：光源，所述光源设置在所述反射片远离所述散热片的一侧。
在根据本公开的一些实施例中，所述光源在所述散热片上的正投影位于所述反射片在所述散热片上的正投影内。
在根据本公开的一些实施例中，所述光源与所述反射片之间具有间隙。
在根据本公开的一些实施例中，背光模组进一步包括：导光板，位于所述反射片远离所述散热片的一侧。
在根据本公开的一些实施例中，背光模组进一步包括：光学膜层，所述光学膜层位于所述导光板远离所述反射片的一侧。
在根据本公开的一些实施例中，所述散热片直接粘结在所述胶框上。
根据本公开的另一个方面，提供了一种显示装置，包括上述根据本公开的背光模组。
附图说明
本公开的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1显示了根据本公开一个实施例的背光模组的结构示意图；
图2显示了相关技术背光模组的结构示意图；
图3显示了根据本公开一个实施例的背光模组的结构示意图；
图4显示了图3中A区域的俯视图；
图5显示了根据本公开一个实施例的背光模组的结构示意图；以及
图6显示了根据本公开一个实施例的背光模组部分结构的俯视图。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本公开，而不能理解为对本公开的限制。
本公开是基于发明人对于以下事实和问题的发现和认识作出的：
发明人发现，目前的背光模组普遍存在着背光模组中的反射片翘曲所引起的褶皱、牛顿环等光学不良。发明人经过深入研究以及大量实验发现，这主要是由于散热膜材与反射片之间的平整度不一致而产生应力，且温度变化时散热膜材与反射片收缩量不一致从而造成反射片的翘曲。如前所述，为了满足用户对显示屏的尺寸以及亮度的需求，背光LED数量在不断增多，同时，随着显示装置分辨率的不断提高，LCD驱动芯片、驱动电路的功耗也在不断增加。液晶显示装置的背光LED与LCD驱动芯片一般设计在同一侧，两者所散发的热量会产生叠加效应。上述叠加效应进一步加剧了散热膜材以及反射片之间的翘曲程度。如前所述，增加LED的数量是为了提高显示装置的显示亮度，因此上述问题难以通过减少LED的数目解决。目前在现有的液晶装置中，会在背光模组中设置散热膜材以便提高散热 效果，将散热膜材通过双面胶直接贴附在反射片上。该设置方式虽然可以起到较好的散热效果，缓解热量叠加对LED以及驱动芯片的损伤，但无法缓解反射片翘曲所引起的褶皱、牛顿环等光学不良。发明人发现，上述设置方式中，散热膜材与反射片之间紧密贴合，因此当反射片以及散热膜材发生膨胀变形时，反而会加剧反射片的翘曲，导致产生褶皱、牛顿环等严重光学不良增加。
在本公开的一个方面，本公开提出了一种背光模组。根据本公开的实施例，参考图1，该背光模组包括：胶框100、散热片200以及反射片300。根据本公开的实施例，散热片200可以固定到胶框100(例如粘结在胶框100上)并与胶框100构成盒形结构。也就是说，散热片200包括由胶框100包围的一个区域。根据本公开的实施例，反射片300设置在盒形结构中，例如反射片300设置在散热片200的上述区域中，并且反射片300可以相对于散热片200移动。由此，该背光模组具有以下优点的至少之一：散热片未与反射片粘结，避免反射片发生翘曲，防止褶皱、牛顿环等光学不良；反射片设置在盒形结构中，即仅在散热片200的上述区域中设置反射片，反射片不再延伸到胶框下，从而可以减小背光模组的厚度，更加轻薄；盒形结构可作为背光模组的整体支撑结构。
为了便于理解，下面对上述盒型结构以及散热片、反射片的设置方式进行详细说明：
根据本公开的实施例，参考图6，上述胶框100可以为口字型结构，胶框100的底部与散热片固定(例如粘接)起来，即可以形成以散热片200为底面，胶框100的框体为环形边框(侧壁)的盒形结构，胶框100的内侧壁，以及散热片200限定出盒形结构的容纳空间。也即是说，由胶框100限定了散热片200上的一个区域，将反射片300放置在盒形结构的容纳空间中，堆叠在散热片形成的盒形结构的底面上。即，反射片300设置在散热片200的上述区域中。
根据本公开实施例的背光模组，与相关技术中常用的背光模组相比，具有可缓解反射片发生翘曲，防止褶皱、牛顿环等光学不良、降低模组厚度等优点。具体的，参考图2，如前所述，相关技术中的背光模组，多将反射片300以及散热片200层叠设置在胶框100的底部，利用反射片以及散热片构成背光模组盒形结构的底面。因此，反射片300以及散热片200之间多采用胶层40紧密粘结。根据本公开的实施例，参考图3，由于将反射片300设置在盒形结构内部，因此散热片200实际为实现背光模组其他结构的支撑的部件。因此，仅需要将散热片200通过粘结层400，固定在胶框100底部即可。因此，可以避免在散热片200以及反射片300之间设置粘结剂。由此，反射片未与散热片通过粘结剂粘结，从而反射片可以相对于散热片移动，即便散热片200以及反射片300受热发生膨胀且两种膜材的热膨胀系数不一致，也不会因为膜材之间产生应力导致反射片的翘曲，从而可以防止光学不良，且散热片不直接粘结在反射片上，背光模组的厚度减小，更加轻薄。
根据本公开的实施例，该背光模组进一步包括导光板600以及光学膜层700。根据本公开的实施例，导光板600设置在盒形结构中，且位于反射片300远离散热片200的一侧。由此，可以进一步提高该背光模组的性能。关于导光板600的具体设置方式不受特别限制，本领域技术人员可以根据实际情况进行选择。例如，根据本公开的实施例，导光板600可以卡接在胶框100的内侧壁上。根据本公开的实施例，光学膜层700也可以设置在盒形结构中，且位于导光板600远离反射片300的一侧。由此，可以进一步提高该背光模组的性能。根据本公开的实施例，光学膜层700的具体类型不受特别限制，本领域技术人员可以根据实际需求进行选择。例如，光学膜层700可以为多层膜层堆叠的结构，也可以为一个复合的膜层。光学膜层700具体可以包括增透膜、棱镜膜、扩散膜等结构，以便进一步提高该背光模组的性能。根据本公开的实施例，光学膜层700的具体设置方式不受特别限制，本领域技术人员可以根据实际需求进行选择。例如，本领域技术人员能够理解的是，由于背光模组的出光侧(靠近光学膜层700的一侧)需要设置液晶模组800，因此，可通过对导光板600以及光学膜层700的厚度进行设计，令其可堆叠在盒形结构中，上部依靠液晶模组800进行固定。由此，光学膜层700与导光板600之间只要按顺序堆叠即可，不需要粘贴连接。
根据本公开的实施例，形成散热片200的材料的具体类型不受特别限制，只需满足能够使背光模组具有良好的散热功能即可。例如，根据本公开的实施例，形成散热片200的材料可以为天然石墨、人工合成石墨、铜箔、铝箔或者导热硅胶膜。由此，可以提高散热片200的散热性能，进一步提高背光模组的性能。
根据本公开的实施例，散热片200与胶框100之间的固定方式不受特别限制，只要能够构成盒形结构，利用散热片200以及胶框100构成容纳其他结构的空间并进行支撑即可。例如，根据本公开的具体实施例，参考图3以及图6，可以在胶框100的底面上设置有粘结层400，散热片200通过粘结层400粘结在胶框100上。由此，散热片200与胶框100的底面紧密粘结，可以减小间隙，防止漏光。根据本公开的实施例，散热片200可以通过粘结层400粘结在胶框100的底部上，所形成的结构为盒形结构。根据本公开的实施例，粘结层400的宽度不大于胶框100的底面的宽度。由此，可以防止粘结层400进入胶框100内。根据本公开的实施例，形成粘接层400的材料的具体类型不受特别限制，只需满足能够使胶框100底面与粘接层400粘接即可。例如，根据本公开的实施例，粘结层400可以为双面胶。具体的，可以采用口字形双面胶直接做为粘结层400。由此，可以进一步降低成本。
根据本公开的实施例，反射片300固定在胶框100中的具体方式不受特别限制，只要能够实现反射片300的固定即可。例如，参考图4，可以在胶框100的内侧壁设置有卡接 部110，反射片300卡接在卡接部110上。由此，反射片可以简便地卡接在胶框结构中，无需通过粘结剂粘结。根据本公开的实施例，卡接部110包括多个卡槽，反射片300具有多个与卡槽相配合的凸起部31，每个凸起部31卡接在对应的卡槽中。由此，反射片300与胶框100的卡接更加匹配。由此，反射片300仅通过卡接，堆叠在散热片200上而非紧密粘结，当温度变化时，散热片200与反射片300不会因为收缩量不一致，造成反射片300的翘曲，避免了翘曲所引起的褶皱、牛顿环等光学不良。另一方面，具有上述结构的背光模组的总厚度为盒形结构的厚度与散热片200厚度之和，与目前在背光模组中增加散热片200相比，减少了胶层以及反射片的厚度。
根据本公开的实施例，参考图5，该背光模组进一步包括光源500。根据本公开的实施例，光源500设置在盒形结构中，且位于反射片300远离散热片200的一侧。由此，可以进一步提高该背光模组的性能。根据本公开的实施例，光源500在散热片200上的正投影位于反射片300在散热片上的正投影内。由此，可利用反射片300对光源500发出的光进行更好的反射，以提高该背光模组的背光亮度。根据本公开的实施例，光源500与反射片300之间具有间隙。由此，可以防止光源500处过热。
在本公开的另一方面，本公开提出了一种显示装置。根据本公开的实施例，该显示装置包括前面所述的背光模组。由此，该显示装置可以具有前面描述的背光模组所具有的全部特征以及优点，在此不再赘述。总的来说，该显示装置具有以下优点的至少之一：散热片未与反射片粘结，避免反射片发生翘曲，防止褶皱、牛顿环等光学不良；反射片设置在盒形结构中，可以减小显示装置的厚度，更加轻薄；盒形结构可作为显示装置的整体支撑结构。
在本公开的描述中，术语“上”、“下”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开而不是要求本公开必须以特定的方位构造和操作，因此不能理解为对本公开的限制。
在本说明书的描述中，参考术语“一个实施例”、“另一个实施例”等的描述意指结合该实施例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。另外，需要说明的是，本说明书中，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。
尽管上面已经示出和描述了本公开的实施例，可以理解的是，上述实施例是示例性的， 不能理解为对本公开的限制，本领域的普通技术人员在本公开的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (15)

  1. 一种背光模组，包括：
    散热片；
    胶框，所述胶框固定到所述散热片上并且包围所述散热片上的区域；以及
    反射片，所述反射片设置在由所述胶框包围的所述区域中，使得所述反射片可以相对于所述散热片移动。
  2. 根据权利要求1所述的背光模组，其中所述散热片以及所述反射片之间不具有粘结剂。
  3. 根据权利要求1所述的背光模组，其中所述散热片的材料为天然石墨、人工合成石墨、铜箔、铝箔或者导热硅胶膜。
  4. 根据权利要求1所述的背光模组，其中所述胶框的内侧壁设置有卡接部，所述反射片卡接在所述卡接部上。
  5. 根据权利要求4所述的背光模组，其中所述卡接部包括多个卡槽，所述反射片具有多个凸起部，每个凸起部卡接在对应的卡槽中。
  6. 根据权利要求1所述的背光模组，其中所述胶框的底面上设置有粘结层，所述散热片通过所述粘结层固定到所述胶框。
  7. 根据权利要求6所述的背光模组，其中所述粘结层的宽度不大于所述胶框的所述底面的宽度。
  8. 根据权利要求6所述的背光模组，其中所述粘结层为口字形双面胶。
  9. 根据权利要求1所述的背光模组，进一步包括：
    光源，所述光源设置在所述反射片远离所述散热片的一侧。
  10. 根据权利要求9所述的背光模组，其中所述光源在所述散热片上的正投影位于所述反射片在所述散热片上的正投影内。
  11. 根据权利要求9所述的背光模组，其中所述光源与所述反射片之间具有间隙。
  12. 根据权利要求9所述的背光模组，进一步包括：
    导光板，位于所述反射片远离所述散热片的一侧。
  13. 根据权利要求12所述的背光模组，进一步包括：
    光学膜层，所述光学膜层位于所述导光板远离所述反射片的一侧。
  14. 根据权利要求1所述的背光模组，其中所述散热片直接粘结在所述胶框上。
  15. 一种显示装置，包括权利要求1-14中任一项所述的背光模组。
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