WO2016155212A1 - 一种背光模组及显示装置 - Google Patents

一种背光模组及显示装置 Download PDF

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Publication number
WO2016155212A1
WO2016155212A1 PCT/CN2015/087827 CN2015087827W WO2016155212A1 WO 2016155212 A1 WO2016155212 A1 WO 2016155212A1 CN 2015087827 W CN2015087827 W CN 2015087827W WO 2016155212 A1 WO2016155212 A1 WO 2016155212A1
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WO
WIPO (PCT)
Prior art keywords
light guide
guide plate
backlight module
elastic member
flexible pad
Prior art date
Application number
PCT/CN2015/087827
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English (en)
French (fr)
Inventor
孟献雷
高建斌
李慧军
Original Assignee
京东方科技集团股份有限公司
北京京东方多媒体科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 京东方科技集团股份有限公司, 北京京东方多媒体科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/913,126 priority Critical patent/US20170038525A1/en
Priority to EP15832665.2A priority patent/EP3287690A4/en
Publication of WO2016155212A1 publication Critical patent/WO2016155212A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • 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
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • 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
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F21V17/16—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting
    • F21V17/164—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening by deformation of parts; Snap action mounting the parts being subjected to bending, e.g. snap joints
    • 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
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • 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
    • G02B6/0093—Means for protecting the light guide
    • 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

Definitions

  • Embodiments of the present invention relate to a backlight module and a display device.
  • the backlight module of the display device can be divided into a direct type and a side type according to the distribution position of the light source (light-emitting diode LED is generally used today).
  • the light source of the direct type backlight module is distributed at the bottom of the light guide plate, and the backlight module is mainly applied to a large-sized display device such as a display and a television.
  • the light source of the side-lit backlight module is distributed on the side of the light guide plate.
  • the backlight module is mainly applied to small-sized display devices such as notebooks, palmtop computers, and mobile phones.
  • the side-entry backlight module has also begun to be applied to a larger-sized display device, thereby providing a better visual experience for the user.
  • the assembly of the light guide plate and the back plate mainly has the following two structural forms:
  • the first structural form is as shown in FIG. 1a (ie, prior art 1), the four corners of the light guide plate 2 have a notch, and the back plate 1 has a riveted steel column 1a corresponding to the notch, and the riveted steel column 1a is engaged with the notch, thereby The light guide plate 2 is assembled with the back plate 1.
  • the second structure is as shown in FIG. 1b (ie, prior art 2), the side of the light guide plate 4 has a protrusion 4a, and the back plate 3 has a groove corresponding to the position of the protrusion 4a, and the protrusion 4a is matched with the groove. Thereby, the light guide plate 4 is assembled with the back plate 3.
  • the embodiment of the invention provides a backlight module and a display device to improve the backlight unevenness caused by thermal expansion of the light guide plate, thereby improving the display effect of the display device.
  • An embodiment of the present invention provides a backlight module including a backboard and a light guide plate, the backboard having a sidewall and a receiving recess at least partially defined by the sidewall; the light guide is located in the capacitor The recess is disposed; an elastic member is disposed between at least one side of the light guide plate and the opposite side wall of the back plate.
  • the elastic member located between the side surface of the light guide plate and the side wall of the back plate can be elastically compressed when the light guide plate is thermally expanded, thereby extending the light guide plate while extending the light guide plate.
  • the deformation provides cushioning, which effectively reduces the arching deformation of the light guide plate.
  • the technical solution of the embodiment of the present invention can effectively improve the backlight unevenness caused by the extrusion of the rigid riveted steel column or the rigid groove when the light guide plate is thermally expanded in the prior art, thereby improving the display.
  • the display effect of the device In addition, there is no need to process notches or bumps on the light guide plate, which greatly reduces material waste and reduces processing costs.
  • the elastic components can also provide good cushioning protection.
  • the elastic component comprises a flexible pad.
  • the flexible pad has a simple structure, a low cost, and can provide a good buffer protection effect.
  • the elastic member is fixed to a side wall of the backboard.
  • the solution of the embodiment facilitates assembly of the backlight module, and is advantageous for improving assembly efficiency.
  • the resilient member is attached to the sidewall of the backing plate by bonding or fasteners.
  • the resilient member is detachably coupled to a sidewall of the backing plate.
  • the detachable connection between the elastic member and the back plate facilitates assembly and disassembly, which helps to reduce maintenance costs.
  • the back side wall has a through hole corresponding to the position of the elastic member; the elastic member has a positioning post passing through the through hole, and the end of the positioning post has a card stuck on the outer side of the side wall of the back plate Increase the fixed part.
  • the structural design of the flexible pad is easy to assemble, disassemble, and is not easily damaged.
  • the elastic member has a boss that supports a side surface of the light guide plate. Designing the boss structure on the elastic member allows the elastic member to have a two-stage cushioning effect.
  • the boss is first pressed to compress it, and as the amount of extension of the light guide plate is further increased, the pressing force causes a large compression deformation of the main portion of the elastic member, thereby guiding Extended deformation of the light panel Provide buffering.
  • the elasticity of the boss can clamp the light guide plate, so that the light guide plate is not easily separated from the back plate, thereby improving the assembly precision of the light guide plate and the back plate.
  • the elastic member has at least two bosses, and the at least two bosses are spaced apart.
  • the design can increase the elastic compression range of the elastic member, make the elastic deformation of the elastic member easier to control, and can provide better elastic support and fixation to the light guide plate, and improve the assembly precision of the light guide plate during thermal expansion.
  • the flexible pad is a dark flexible pad.
  • the dark flexible pad has a low light transmittance and has little effect on the optical quality of the backlight module.
  • the embodiment of the invention further provides a display device, which comprises the backlight module of any of the foregoing technical solutions. Since the optical quality of the backlight module is less affected by the thermal expansion of the light guide plate, the display device also has a better display effect.
  • 1a is a partial top plan view showing a structure of a light guide plate and a back plate in the prior art 1;
  • 1b is a partial top plan view showing a structure of a light guide plate and a back plate in the prior art 2;
  • FIG. 2a is a top view showing an assembly structure of a light guide plate and a back plate in a backlight module according to an embodiment of the invention
  • Figure 2b is a partial enlarged view of the portion A in Figure 2a;
  • FIG 3 is a schematic view showing a connection structure of a flexible pad and a side wall of the backboard.
  • the embodiment of the invention provides a backlight module and a display device.
  • the elastic member located between at least one side of the light guide plate and the opposite side wall of the back plate can be elastically compressed when the light guide plate is thermally expanded, thereby extending the light guide plate while extending the light guide plate.
  • the deformation provides cushioning, which effectively reduces the arching deformation of the light guide plate.
  • the technical solution of the embodiment of the present invention can effectively improve the backlight unevenness caused by the extrusion of the rigid riveted steel column or the rigid groove when the light guide plate is thermally expanded in the prior art, thereby improving the display.
  • the display effect of the device can effectively improve the backlight unevenness caused by the extrusion of the rigid riveted steel column or the rigid groove when the light guide plate is thermally expanded in the prior art, thereby improving the display.
  • the display effect of the device can effectively improve the backlight unevenness caused by the extrusion of the rigid riveted steel column or the rigid groove when the light guide plate is thermally expanded in the prior art, thereby improving the display.
  • the display effect of the device can effectively improve the backlight unevenness caused by the extrusion of the rigid riveted steel column or the rigid groove when the light guide plate is thermally expanded in the prior art, thereby improving the display.
  • an embodiment of the present invention provides a backlight module.
  • the backplane 12 of the backlight module has a sidewall 121 and a receiving recess 123 defined at least partially by the sidewall 121.
  • the light guide plate 13 of the backlight module is disposed in the accommodating recess 123; and at least one side of the light guide plate 13 and the opposite side wall 121 of the back plate 12 are provided with an elastic member (the flexible pad 14 is specifically used in this embodiment).
  • the elastic member 14 preferably adopts the flexible pad 14 in the embodiment shown in FIG. 2a and FIG. 2b of the present invention.
  • the flexible pad 14 has a simple structure, a low cost, and can provide a good buffer protection effect.
  • the elastic member may be disposed on at least one side of the light guide plate 13, for example, on one side, two sides, three sides, or four sides of the light guide plate 13.
  • the elastic member is disposed on the non-light-incident side of the light guide plate 13.
  • the resilient member is a flexible pad 14, although the invention is not limited thereto.
  • the resilient member may also comprise a spring or the like.
  • the backlight module usually includes components such as a frame, a light source, a reflection sheet, and a film group, and the back plate 12 is a key component for supporting other components.
  • the back plate 12 includes a rectangular bottom plate 125 and side walls 121 on four sides of the rectangular bottom plate, and the rectangular bottom plate and the side walls define the receiving grooves 123 of the back plate 12. As shown in FIG. 2b, when the light guide plate 13 is located in the accommodating recess 123, the side faces of the light guide plate 13 are opposed to the adjacent back plate sidewalls.
  • the flexible pad 14 may be disposed between the side of the light guide plate 13 and the opposite side wall of the back plate 12. The number of the flexible pads 14 can be specifically designed according to the size of the light guide plate 13 to equalize the sides of the light guide plate 13.
  • the light guide plate may undergo arching deformation when heated and expanded, thereby affecting the picture uniformity of the backlight module.
  • the elastic member located between the side surface of the light guide plate and the side wall of the back plate can be elastically compressed when the light guide plate is thermally expanded, thereby providing buffer for the extension deformation of the light guide plate, thereby effectively reducing the guide.
  • the arch of the light plate is deformed.
  • the solution of the embodiment can effectively improve the thermal expansion of the light guide plate.
  • the unevenness of the backlight caused by the expansion enhances the display effect of the display device.
  • the light guide plate 13 can be designed as a rectangle, and no need to process notches or protrusions thereon, which greatly reduces the waste of the light guide plate material, improves the processing efficiency, and reduces the processing cost.
  • the size control of the flexible pad 14 and the light guide plate 13 is looser than that of the prior art, which greatly reduces the processing difficulty of the light guide plate 13 and the back plate 12, and on the other hand, reduces the difficulty.
  • the processing cost of the backlight module When the backlight module vibrates or falls, the flexible pad 14 can also provide a good buffer protection, thereby reducing the possibility of damage to the backlight module.
  • the flexible pad 14 is secured to the side wall of the backing plate 12.
  • the flexible pad 14 has been securely positioned.
  • the solution of the embodiment facilitates assembly of the backlight module, and is advantageous for improving assembly efficiency.
  • the flexible pad can be attached to the side wall of the backing plate by any suitable fixed connection.
  • the flexible pad can be secured to the side wall of the backing plate by bonding; for example, the flexible pad can be attached to the side wall of the backing plate by fasteners.
  • the flexible pad may be detachably coupled to the sidewall of the backing plate.
  • the detachable connection facilitates assembly and removal of the flexible pad to the backing plate, which helps to reduce maintenance costs.
  • the back plate may be provided with a buckle or a card hole that is matched with the flexible pad. When the light guide plate is placed, the flexible pad may be snapped into the buckle or the card hole of the back plate. As shown in FIG.
  • the sidewall of the backing plate 12 has a through hole corresponding to the position of the flexible pad 14; the flexible pad 14 has a positioning post 16 passing through the through hole, and the end of the positioning post 16
  • the enlarged fixing portion which is stuck on the outer side of the side wall of the back plate 12 may be a flexible cap 17 in order to better fit the flexible pad and facilitate assembly.
  • the fixing portion of the present invention may have various forms such as a rigid snap or the like.
  • the through holes and corresponding positioning posts 16 can have any suitable number, and can be one, two or three, and the like.
  • the flexible cap 17 When the flexible pad 14 is assembled with the side wall of the back plate 12, after the positioning post 16 is passed through the through hole from the inner side of the side wall of the back plate 12, the flexible cap 17 is stretched in a natural state to be limited to the side wall of the back plate 12. Outside. When it is desired to separate the flexible pad 14 from the side wall of the backing plate 12, the flexible cap 17 is pushed from the outside of the side wall of the backing plate 12 using a needle bar to disengage the positioning post 16 from the through hole. In addition, it can also be directly from the side wall of the back panel 12. The flexible pad 14 is pulled away from the side. In this embodiment, the material and structural characteristics of the flexible pad 14 make it easy to assemble, disassemble, and not easily damaged.
  • the flexible pad 14 has a boss 18 that supports the side of the light guide plate 13.
  • the boss structure on the flexible pad 14 allows the flexible pad 14 to have a two-stage cushioning effect.
  • the boss 18 is first pressed to be compressed, and as the amount of deformation of the light guide plate 13 is further increased, the pressing force causes a large compression deformation of the main portion of the flexible pad 14, thereby The buffer for the extension deformation of the light guide plate 13 is provided, and the arching deformation of the light guide plate 13 is effectively reduced.
  • the elasticity of the boss 18 can clamp the light guide plate 13 so that the light guide plate 13 is not easily separated from the back plate 12, thereby improving the assembly precision of the light guide plate 13 and the back plate 12.
  • the number and specific shape of the bosses 18 are not limited. As shown in FIG. 3, in this embodiment, the flexible pad 14 has two bosses 18, and the bosses 18 are cylindrical.
  • the flexible pad has at least two bosses, at least two of which are spaced apart.
  • the bosses can have any suitable shape, such as circular, square, elongated, and the like.
  • the design can increase the elastic compression range of the flexible pad, make the elastic deformation of the flexible pad easier to control, and can provide better elastic support for the light guide plate and improve the assembly precision of the light guide plate during thermal expansion.
  • the flexible pad 14 can be of any suitable material, for example, a silicone flexible pad or a rubber flexible pad can be used.
  • the flexible mat has a Shore hardness of 60 to 70.
  • the flexible pad in the hardness range can provide better cushioning and fixing and positioning for the light guide plate, and the assembly is also convenient.
  • the flexible pad 14 preferably employs a dark flexible pad, such as a black flexible pad.
  • the dark flexible pad has a low light transmittance, which can reduce light leakage and has less influence on the optical quality of the backlight module.
  • the embodiment of the invention further provides a display device, comprising the backlight module of any of the foregoing embodiments. Since the optical quality of the backlight module is less affected by the thermal expansion of the light guide plate, the display device also has a better display effect.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种背光模组和一种包含该背光模组的显示装置。所述背光模组包括背板（12）和导光板（13），所述背板（12）具有侧壁（121）和至少部分地由所述侧壁（121）限定的容置凹槽（123）；所述导光板（13）位于所述容置凹槽（123）内；所述导光板（13）的至少一侧面与所述背板（12）的相对侧壁之间设置有弹性部件（14）。弹性部件（14）可在导光板（13）热膨胀时弹性压缩，从而为导光板（13）的延展变形提供缓冲，有效减少导光板（13）的拱起变形。

Description

一种背光模组及显示装置 技术领域
本发明的实施例涉及一种背光模组及显示装置。
背景技术
目前，显示装置的背光模组按照光源(如今普遍采用发光二极管LED)的分布位置，可分为直下式和侧入式两种。直下式背光模组的光源分布于导光板的底部，该类背光模组主要应用于显示器、电视等大尺寸显示装置。侧入式背光模组的光源分布于导光板的侧边，该类背光模组主要应用于笔记本、掌上电脑以及手机等小尺寸显示装置。随着LED相关技术的不断进步，侧入式背光模组同样也开始应用于较大尺寸的显示装置，为用户带来更好的视觉感受。
在现有的背光模组中，导光板与背板的装配主要有以下两种结构形式：
第一种结构形式如图1a所示(即现有技术1)，导光板2的四角具有缺口，背板1对应缺口的位置具有铆合钢柱1a，铆合钢柱1a与缺口配合，从而使导光板2与背板1装配。
第二种结构形式如图1b所示(即现有技术2)，导光板4的侧边具有凸起4a，背板3对应凸起4a的位置具有凹槽，凸起4a与凹槽配合，从而使导光板4与背板3装配。
上述两种现有技术存在的缺陷在于，导光板在受热膨胀时，受刚性铆合钢柱或刚性凹槽的挤压，会出现拱起变形，从而影响到背光模组的画面均一性，进而影响到显示装置的显示效果。此外，在导光板上加工缺口或者凸起，不但不利于节约原材料，而且加工成本较高。
发明内容
本发明实施例提供了一种背光模组及显示装置，以改善因导光板热膨胀引起的背光不均匀现象，从而提升显示装置的显示效果。
本发明实施例提供了一种背光模组，包括背板和导光板，所述背板具有侧壁和至少部分地由所述侧壁限定的容置凹槽；所述导光板位于所述容置凹槽内；所述导光板的至少一侧面与所述背板的相对侧壁之间设置有弹性部件。
在本发明实施例的技术方案中，位于导光板的侧面与背板的侧壁之间的弹性部件可在导光板热膨胀时弹性压缩，从而在固定了导光板的同时，还为导光板的延展变形提供缓冲，有效减少导光板的拱起变形。相比于现有技术，本发明实施例的技术方案可以有效改善现有技术中因导光板热膨胀时，受刚性铆合钢柱或刚性凹槽的挤压引起的背光不均匀现象，从而提升显示装置的显示效果。此外，导光板上无需加工缺口或凸起，这大大减少了材料浪费，降低了加工成本。当背光模组振动或者跌落时，弹性部件也能起到很好的缓冲保护作用。
例如，所述弹性部件包括柔性垫。柔性垫的结构简单，成本较低，且能够起到较好的缓冲保护效果。
例如，所述弹性部件固定于所述背板的侧壁。该实施例方案便于背光模组的组装，有利于提高组装效率。
例如，所述弹性部件通过粘接或紧固件而连接至所述背板的侧壁。
例如，所述弹性部件可拆卸地连接至所述背板的侧壁。弹性部件与背板的可拆卸连接便于组装拆卸，有利于降低维修成本。
例如，所述背板侧壁对应所述弹性部件的位置具有通孔；所述弹性部件具有穿过所述通孔的定位柱，所述定位柱的端部具有卡于背板侧壁外侧的加大固定部。该实施例中，柔性垫的结构设计便于组装、拆卸，且不易损坏。
例如，所述弹性部件具有支撑导光板的侧面的凸台。在弹性部件上设计凸台结构可以使弹性部件具有两级缓冲的效果。当导光板因热膨胀延展变形时，首先会挤压凸台使其压缩，随着导光板延展变形量的进一步增加，挤压力使弹性部件的主体部分也发生较大的压缩变形，从而为导光板的延展变形 提供缓冲。此外，凸台的弹性能够把导光板卡紧，使导光板不易与背板分离，从而提高了导光板与背板的装配精度。
例如，所述弹性部件具有至少两个凸台，所述至少两个凸台间隔设置。该设计可增大弹性部件的弹性压缩范围，使弹性部件的弹性变形更容易管控，并且能够对导光板提供更好的弹性支撑与固定，提高导光板热膨胀时的装配精度。
例如，所述柔性垫为深色柔性垫。深色柔性垫的光透过率较低，对背光模组的光学品质影响较小。
本发明实施例还提供了一种显示装置，包括前述任一技术方案所述的背光模组。由于背光模组的光学品质受导光板热膨胀的影响较小，使得该显示装置也具有较佳的显示效果。
附图说明
图1a为现有技术1中导光板与背板装配结构的局部俯视示意图；
图1b为现有技术2中导光板与背板装配结构的局部俯视示意图；
图2a为本发明一实施例的背光模组中导光板与背板装配结构俯视图；
图2b为图2a中A处局部放大示意图；
图3为柔性垫与背板侧壁的一种连接结构示意图。
具体实施方式
为了改善因导光板热膨胀引起的背光不均匀现象，进而提升显示装置的显示效果，本发明实施例提供了一种背光模组及显示装置。在本发明技术方案中，位于导光板的至少一侧面与背板的相对侧壁之间的弹性部件可在导光板热膨胀时弹性压缩，从而在固定了导光板的同时，还为导光板的延展变形提供缓冲，有效减少导光板的拱起变形。相比于现有技术，本发明实施例的技术方案可以有效改善现有技术中因导光板热膨胀时，受刚性铆合钢柱或刚性凹槽的挤压引起的背光不均匀现象，从而提升显示装置的显示效果。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行描述。显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于所描述的本发明中的实施例，本领域普通技术人员在没有做出无需创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
如图2a和图2b所示，本发明实施例提供了一种背光模组，背光模组的背板12具有侧壁121和至少部分地由所述侧壁121限定的容置凹槽123；背光模组的导光板13位于容置凹槽123内；导光板13的至少一侧面与背板12的相对侧壁121之间设置有弹性部件(该实施例中具体采用了柔性垫14)。
弹性部件优选采用本发明图2a和图2b所示实施例中的柔性垫14，柔性垫14的结构简单，成本较低，且能够起到较好的缓冲保护效果。取决于导光板13的热膨胀延展方向，弹性部件可设置在导光板13的至少一侧面，例如在导光板13的一个侧面、两个侧面、三个侧面或四个侧面上。优选将弹性部件设置在导光板13的非入光侧面。在图2a和图2b所示的实施例中，弹性部件是柔性垫14，然而本发明不限于此。在本发明的其它实施例中，弹性部件也可以包含弹簧等部件。
背光模组除包含背板12和导光板13外，通常还包括框架、光源、反射片、膜材组等零部件，而背板12是支撑其它零部件的关键部件。背板12包括矩形底板125和位于矩形底板四边的侧壁121，矩形底板和侧壁限定了背板12的容置凹槽123。如图2b所示，当导光板13位于所述容置凹槽123中时，导光板13的各侧面与相邻的背板侧壁相对。柔性垫14可设置在导光板13的侧面与背板12的相对侧壁之间。柔性垫14的数量可以根据导光板13的尺寸进行具体设计，以使导光板13的侧面受力均衡。
在现有技术中，导光板与背板的侧壁之间是刚性接触，导光板在受热膨胀时会产生拱起变形，从而影响到背光模组的画面均一性。而在本发明该实施例的技术方案中，位于导光板的侧面与背板的侧壁之间的弹性部件可在导光板热膨胀时弹性压缩，从而为导光板的延展变形提供缓冲，有效减少导光板的拱起变形。本实施例方案与现有技术相比，可以有效改善因导光板热膨 胀引起的背光不均匀现象，从而提升显示装置的显示效果。
如图2a所示，导光板13可以设计为矩形，其上无需加工缺口或凸起，这大大减少了导光板材料的浪费，并且提高了加工效率，降低了加工成本。此外，由于柔性垫14的可压缩性，柔性垫14与导光板13的尺寸管控相比现有技术较为宽松，这大大降低了导光板13和背板12的加工难度，从另一方面降低了背光模组的加工成本。当背光模组振动或者跌落时，柔性垫14还能够起到很好的缓冲保护作用，从而减少了背光模组损坏的可能性。
作为本发明的一个优选实施例，柔性垫14固定于背板12的侧壁。在将导光板13与背板12组装时，柔性垫14已被牢靠定位。该实施例方案便于背光模组的组装，有利于提高组装效率。
柔性垫可通过任何合适的固定连接方式而连接到背板侧壁。例如，柔性垫可以通过粘接固定至背板的侧壁；又例如，柔性垫可以通过紧固件连接至背板的侧壁。
在本发明的实施例中，柔性垫可以可拆卸地连接至背板的侧壁。可拆卸连接便于柔性垫组装至背板和从背板拆卸，有利于降低维修成本。例如，背板上可以设置有与柔性垫配合的卡扣或者卡孔，在组装时，可以在放置好导光板之后，再将柔性垫卡入背板上的卡扣或者卡孔。如图3所示，在本发明的优选实施例中，背板12的侧壁对应柔性垫14的位置具有通孔；柔性垫14具有穿过通孔的定位柱16，定位柱16的端部具有卡于背板12侧壁外侧的加大固定部，为了与柔性垫更好的配合以及便于组装，本实施例中的固定部可以是柔性帽17。然而本发明不限于此，在可选实施例中，本发明的固定部可以具有多种形式，例如可以是硬质的卡扣等。在本发明的实施例中，通孔及对应定位柱16可以具有任何合适的数量，可以为一组、两组或者三组等等。在将柔性垫14与背板12的侧壁组装时，将定位柱16从背板12的侧壁内侧穿出通孔后，柔性帽17在自然状态下伸展从而限位于背板12的侧壁外侧。当需要将柔性垫14与背板12的侧壁分离时，使用针杆从背板12的侧壁外侧推动柔性帽17，使定位柱16脱离通孔。此外，也可直接从背板12的侧壁内 侧将柔性垫14拔离。该实施例中，柔性垫14的材质及结构特性使其便于组装、拆卸，且不易损坏。
如图2b所示，柔性垫14具有支撑导光板13的侧面的凸台18。在柔性垫14上的凸台结构可以使柔性垫14具有两级缓冲的效果。当导光板13热膨胀变形时，首先会挤压凸台18使其压缩，随着导光板13延展变形量的进一步增加，挤压力使柔性垫14的主体部分也发生较大的压缩变形，从而为导光板13的延展变形提供缓冲，有效减少导光板13的拱起变形。此外，凸台18的弹性能够把导光板13卡紧，使导光板13不易与背板12分离，从而提高了导光板13与背板12的装配精度。凸台18的数量和具体形状不限，如图3所示，该实施例中，柔性垫14具有2个凸台18，凸台18为圆柱形。
在本发明的一个实施例中，柔性垫具有至少两个凸台，至少两个凸台间隔设置。凸台可具有任何合适的形状，例如可以为圆形，方形，长条形等等。该设计可增大柔性垫的弹性压缩范围，使柔性垫的弹性变形更容易管控，并且能够对导光板提供更好的弹性支撑，提高导光板热膨胀时的装配精度。
柔性垫14可以采用任何合适的材料，例如，可以采用硅胶柔性垫或橡胶柔性垫。优选地，柔性垫的邵氏硬度为60～70。该硬度范围内的柔性垫能够为导光板提供较佳的缓冲和固定及定位，组装也较为便利。柔性垫14优选采用深色柔性垫，例如黑色柔性垫。深色柔性垫的光透过率较低，可减少漏光现象，对背光模组的光学品质影响较小。
本发明实施例还提供了一种显示装置，包括前述任一实施例的背光模组。由于背光模组的光学品质受导光板热膨胀的影响较小，使得该显示装置也具有较佳的显示效果。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (11)

  1. 一种背光模组，包括背板和导光板，其中所述背板具有侧壁和至少部分地由所述侧壁限定的容置凹槽；所述导光板位于所述容置凹槽内；所述导光板的至少一侧面与所述背板的相对侧壁之间设置有弹性部件。
  2. 如权利要求1所述的背光模组，其中所述弹性部件被配置成在所述导光板热膨胀时被所述导光板压缩。
  3. 如权利要求1所述的背光模组，其中，所述弹性部件包括柔性垫。
  4. 如权利要求1所述的背光模组，其中，所述弹性部件固定于所述背板的侧壁。
  5. 如权利要求4所述的背光模组，其中，所述弹性部件通过粘接或紧固件而连接至所述背板的侧壁。
  6. 如权利要求1所述的背光模组，其中，所述弹性部件可拆卸地连接至所述背板的侧壁。
  7. 如权利要求6所述的背光模组，其中，所述背板侧壁对应所述弹性部件的位置具有通孔；所述弹性部件具有穿过所述通孔的定位柱，所述定位柱的端部具有卡于背板侧壁外侧的加大固定部。
  8. 如权利要求3所述的背光模组，其中，所述弹性部件具有支撑导光板的侧面的凸台。
  9. 如权利要求8所述的背光模组，其中，所述弹性部件具有至少两个凸台，所述至少两个凸台间隔设置。
  10. 如权利要求3所述的背光模组，其中，所述柔性垫为深色柔性垫。
  11. 一种显示装置，包括如权利要求1～10任一项所述的背光模组。
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