WO2014139241A1 - 导光板定位结构及背光模组 - Google Patents

导光板定位结构及背光模组 Download PDF

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Publication number
WO2014139241A1
WO2014139241A1 PCT/CN2013/078177 CN2013078177W WO2014139241A1 WO 2014139241 A1 WO2014139241 A1 WO 2014139241A1 CN 2013078177 W CN2013078177 W CN 2013078177W WO 2014139241 A1 WO2014139241 A1 WO 2014139241A1
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WO
WIPO (PCT)
Prior art keywords
light guide
guide plate
light
elastic member
backlight module
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2013/078177
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English (en)
French (fr)
Inventor
贺虎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
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.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/980,926 priority Critical patent/US9310550B2/en
Publication of WO2014139241A1 publication Critical patent/WO2014139241A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a light guide plate positioning structure and a backlight module.
  • the backlight module is one of the key components of the liquid crystal display. Since the liquid crystal panel itself does not have the ability to emit light, it is necessary to provide a backlight for the liquid crystal display device.
  • the function of the backlight module is to supply a sufficient brightness and a uniform distribution of backlights, so that the liquid crystal display can display images normally.
  • the backlight structure has a direct type and a side entry type.
  • the so-called direct-type backlight refers to a backlight such as a CCFL or an LED die arrayed on the back of the liquid crystal panel, and the emitted light forms a uniform surface backlight through an optical film such as a diffusion plate or a prism sheet; a so-called side-entry backlight It means that the backlight is placed on the side of the liquid crystal panel, the light is incident on the light guide plate, and the line backlight is turned into a uniform surface backlight through the light guide plate. For the fixing of the light guide plate, as shown in FIG.
  • a fixing hole 150 is generally disposed on the light guide plate 100, and then a fixing post 240 is disposed on the back plate 200, and the fixing hole 150 on the light guiding plate 100 is received on the fixing column. The 240 is then fixed to the light guide plate 100 above the back plate 200.
  • the backlight is provided by the LED die 400.
  • the light guide plate 100 may contact the backlight 400, so that the LED die 400 may be damaged, and the light guide plate 100 is fixed by the fixing post 240, and cannot extend in the length direction, resulting in Warping deformation of the vertical surface.
  • it is necessary to leave sufficient space for the light guide plate 100 even if the distance between the light guide plate 100 and the LED die 400 becomes large, the coupling light efficiency is lowered, and the backlight is greatly affected. grade. For example, a 32-inch single short-side light-emitting module is used.
  • the PMMA-based light guide plate is saturated with moisture, its longitudinal expansion amount is about 1.5 to 2 mm. If the light guide plate is fixed in a conventional manner, it needs to be The expansion reserve of the light guide plate is adjusted to 1.5 ⁇ 2mm. If sufficient space is reserved, the coupling distance will become larger, and the backlight efficiency will decrease by about 20%. Therefore, it is necessary to design a light guide plate positioning structure and a backlight module to overcome the above drawbacks. Summary of the invention
  • the object of the present invention is to provide a light guide plate positioning structure and a backlight module.
  • the original fixed column is replaced by the combined structure of the elastic member and the back plate.
  • Fixing the light guide plate solves the problem that the light guide plate is warped and deformed due to the expansion and contraction of the temperature and humidity.
  • the elastic member disposed in contact with the light guide plate in the light guide plate positioning structure can be elastically deformed, and the corresponding deformation occurs as the light guide plate expands and contracts.
  • the elastic member can provide a buffer space for the light guide plate to avoid the arching phenomenon on the vertical surface of the light guide plate; when the light guide plate contracts, apply corresponding thrust to the light guide plate, thereby ensuring the light guide plate and the backlight source.
  • the light coupling distance between the two increases the backlight taste, and at the same time, the structure ensures that the light guide plate positioning structure always maintains the fixing of the light guide plate.
  • the present invention provides a light guide plate positioning structure
  • the light guide plate includes a light incident surface, a light emitting surface connected to the light incident surface, and a side opposite to the light incident surface, wherein the light guide plate
  • the positioning structure is composed of a back plate and an elastic member disposed on the back plate.
  • the light guide plate is fixed on the back plate by the elastic member, and the elastic member is disposed adjacent to the side of the light guide plate, and includes: a connecting portion, fixedly connected to the The positioning portion, the two ends of the positioning portion are respectively a fixed end and a free end, and the fixed end is fixedly connected to the connecting portion, and the free end interacts with the side of the light guide plate to position the light guide plate.
  • the elastic member is fixed to the side wall or the bottom plate of the backboard.
  • the elastic member is made of metal or polymer material.
  • the positioning portion and the connecting portion are integrally formed and fixedly connected.
  • the connecting portion is a horizontal block structure, and the positioning portion is an arcuate block structure.
  • the positioning portion is connected to the connecting portion at an initial angle.
  • the number of elastic members is two or more.
  • the light guide plate is provided with a plurality of fixing holes adjacent to the light incident surface, and the fixing plate is provided with a plurality of fixing columns integrally fixed with the back plate.
  • Another object of the present invention is to provide a backlight module including a heat dissipating member and a light guide plate.
  • the light guide plate has a light incident surface, a light emitting surface connected to the light incident surface, and a side opposite to the light incident surface.
  • the light-incident surface of the source adjacent to the light guide plate is fixed on the heat sink, and the backlight module further includes a light guide plate positioning structure, wherein the light guide plate positioning structure is composed of a back plate and an elastic member disposed on the back plate, and the light guide plate passes the elasticity
  • the member is fixed on the back plate, and the elastic member is disposed adjacent to the side of the light guide plate, and includes:
  • the connecting portion is fixedly connected to the back plate.
  • the positioning portion has two ends respectively being a fixed end and a free end.
  • the fixed end is fixedly connected to the connecting portion, and the free end interacts with the side of the light guide plate to position the light guide plate.
  • the heat sink is fixed to the backing plate by screws or rivets.
  • the elastic member is fixed to the side wall or the bottom plate of the backboard.
  • the elastic member is made of metal or polymer material.
  • the positioning portion and the connecting portion are integrally formed and fixedly connected.
  • the connecting portion is a horizontal block structure, and the positioning portion is an arcuate block structure.
  • the positioning portion is connected to the connecting portion at an initial angle.
  • the number of elastic members is two or more.
  • the light guide plate is provided with a plurality of fixing holes adjacent to the light incident surface, and the fixing plate is provided with a plurality of fixing columns integrally fixed with the back plate.
  • the light guide plate positioning structure and the backlight module of the present invention have the following advantages: the elastic member disposed in contact with the light guide plate in the light guide plate positioning structure can be compressed when the light guide plate expands, thereby being a light guide plate.
  • the expansion provides a buffer space to avoid warping of the vertical surface of the light guide plate; and the light guide plate easily collides with the backlight provided on the light incident surface of the adjacent light guide plate, thereby avoiding damage to the backlight of the light guide plate;
  • the elastic member recovers a certain deformation and applies a thrust to the side surface of the light guide plate, and the light-incident surface is fixed by a fixing column or a rubber block, thereby ensuring the light guide plate and the backlight.
  • the coupling distance between the two increases the coupling efficiency.
  • FIG. 1 is a schematic view showing the working principle of a light guide plate in a backlight module of the present invention.
  • 2 is a schematic view showing a fixing structure of a backlight in a backlight module of the present invention.
  • Fig. 3 is a cross-sectional view taken along line AA of Fig. 2; 4 is a schematic structural view of a conventional light guide plate fixed by a fixed column.
  • FIG. 5 is a schematic view showing deformation warpage of the light guide plate.
  • Figure 6 is a schematic view showing the structure of the elastic member of the present invention.
  • Figure 7 is a plan view showing the assembly of the light guide plate positioning structure in the initial state of Embodiment 1 of the present invention.
  • Fig. 8 is a schematic view showing the state of the elastic member of Fig. 7.
  • FIG. 9 is a top plan view showing the assembly of the light guide plate positioning structure in the expanded state according to the first embodiment of the present invention.
  • Fig. 10 is a schematic view showing the state of the elastic member of Fig. 9.
  • Figure 11 is a plan view showing the assembly of the light guide plate positioning structure in the contracted state according to the first embodiment of the present invention.
  • Figure 12 is a schematic view showing the state of the elastic member of Figure 11;
  • Figure 13 is a cross-sectional view showing the assembly of a light guide plate positioning structure according to Embodiment 2 of the present invention.
  • the working principle of the light guide plate 100 is to use an optical grade acrylic/PC sheet, and then use a material having a very high reflectivity and no light absorption, and a UV screen on the bottom surface of the optical grade acrylic sheet.
  • the printing technique prints a light guiding point 140.
  • the optical grade acrylic sheet is used to absorb the light emitted from the backlight, that is, the LED die 400, on the surface of the optical grade acrylic sheet, and the light is reflected when the light is incident from the light incident surface 110 to each of the light guiding points 140. It will diffuse at various angles, and then the reflection reflection condition is emitted from the light-emitting surface 130 of the light guide plate 100.
  • the light guide plate 100 can be uniformly illuminated by using various light-tight and different-sized light guiding points 140, and the side light-emitting is converted into "face" light-emitting, and the reflecting plate 600 reflects the received light back into the light-guide plate 100. , used to improve the efficiency of light use.
  • the edge-lit backlight design is to arrange the LED die 400 on the edge of the backplane 200, and then use the light guide plate 100 to transmit the light source to the central area of the screen, so that the entire panel has sufficient light source, and the light guide plate 100 is a backlight module.
  • One of the important components in 10 its installation and fixing directly affects the picture quality of the liquid crystal display.
  • Embodiment 1 As shown in FIG. 6 to FIG.
  • the improvement of the present invention mainly lies in the positioning manner of the light guide plate.
  • the light guide plate positioning structure includes the back plate 200 and is disposed on the back plate 200 to be deformed and restored.
  • the elastic member 300 is composed of a metal or a polymer material, and the light guide plate 100 is fixed to the back plate 200 by the elastic member 300.
  • the rectangular back plate 200 in this embodiment has a bottom plate 210 and two oppositely disposed long side walls connected to the bottom plate 210.
  • the light guide plate 100 is disposed on the bottom plate 210, and the two oppositely disposed short side walls 230 connected to the bottom plate 210.
  • the light guide plate 100 has a rectangular shape and is provided with a light incident surface 110.
  • the light guide plate 100 further includes a light emitting surface 130 connected to the light incident surface 110 and a side surface 120 opposite to the light incident surface 110.
  • the LED die 400 in the backlight module 10 is disposed adjacent to the light incident surface 110. wherein, as shown in FIG. 2 and FIG. 3, the LED die 400 is fixed on the heat sink 700, and the heat sink 700 is screwed 800 or A rivet (not shown) is attached to the bottom plate 210 adjacent either of the short side walls 230 to form a single short side incidence.
  • the light guide plate 100 on the light-incident surface 110 side is fixed above the bottom plate 210 by the rubber block 500
  • the elastic member 300 is disposed on the light guide plate 100 away from the LED die. 120 on the side of the 400.
  • the rubber block 500 is fixed to the two ends of the short side wall 230 of the back plate 200 and is tightly sandwiched between the light guide plate 100 and the heat dissipating member 700 to prevent the light guide plate 100 from colliding with the LED die 400.
  • the elastic member 300 includes a positioning portion 310 and a connecting portion 320 .
  • the two end faces of the positioning portion 310 are respectively a fixed end surface and a free end surface 311 .
  • the fixed end surface is integrally formed and fixedly connected to the connecting portion 320 .
  • the connecting portion 320 is a horizontal block structure
  • the positioning portion 310 is a curved block structure, but is not limited thereto.
  • the positioning portion 310 is connected to the connecting portion 320 at a predetermined initial angle ,.
  • the free end surface 311 of the positioning portion 310 and the free end surface 321 of the connecting portion 320 have an initial distance L Q , and the elastic member 300 is elastically deformable and cannot be restored.
  • the limit distance between the free end surface 311 of the positioning portion 310 and the free end surface 321 of the connecting portion 320 is L M . As shown in FIG. 6 to FIG.
  • the relative position of the elastic member 300 and the long side wall 220 is fixed, wherein the connecting portion 320 of the elastic member 300 can be fixed to the long side wall 220 by screws. It can also be fixed by providing a snap structure (not shown) adapted to the connecting portion 320 on the long side wall 220.
  • the side surface 120 of the light guide plate is then brought into contact with the free end surface 311 of the positioning portion 310 and clamped by the positioning portion 310.
  • a groove (not shown) corresponding to the structure of the light guide plate 100 at the corresponding portion is disposed on the positioning portion 310, and the light guide plate 100 is placed in the groove (not shown), but the light guide plate 100 is The structure is always developed in a thinner direction.
  • the first embodiment is used to fix the light guide plate 100.
  • the side surface 120 of the light guide plate 100 is fixed, since the long side distance a of the light guide plate 100 in the initial state is larger than when the light guide plate is not mounted, the free end surface 311 of the positioning portion is installed to the light incident surface 110 of the light guide plate.
  • the side surface 120 of the light guide plate 100 is in contact with the free end surface 311 of the positioning portion 310 disposed on the opposite long side walls 210, the positioning portion 310 is compressed and deformed, so that the light guide plate 100 is deformed.
  • the positioning portion 310 is deformed by the pressing to apply the thrust F to the light guide plate 100.
  • the action of 1 causes the light guide plate 100 to approach the side of the light incident surface 110.
  • the displacement of the light guide surface 110 on the back plate 200 does not change, that is, the coupled light distance D is kept constant. As shown in FIG. 9 and FIG.
  • the elastic member 300 due to the pressing force is applied to the light guide plate 100 so as F 2, under the action of the force F 2, still holding the respective light coupling distance D, where 1 ⁇ 2 recoverable elasticity of the elastic member 300 Within the range of deformation, ie L 2 ⁇ L M .
  • the total length of the light guide plate 100 is decreased by ⁇ 1, at which time part of the stress of the elastic member 300 is released, and the free end face of the positioning portion 310 is released.
  • Embodiment 2 The light guide plate positioning structure of Embodiment 2 is similar to the light guide plate positioning structure in Embodiment 1, as shown in FIG. 13, which is different in that: the relative position of the elastic member 300 and the bottom plate 210 is fixed, that is, elasticity.
  • the connecting portion 320 of the member 300 is fixedly coupled to the bottom plate 210.
  • a plurality of elastic members 300 may be disposed on the bottom plate 210 along the side surface 120 of the light guide plate 100 instead of two, and the fixing strength thereof is better.
  • the light guide plate 100 is fixed to the light incident surface 110 side by a fixing post 240 provided on the bottom plate 210.
  • a plurality of fixing holes 150 are symmetrically disposed on the light-emitting surface 130 and adjacent to the side of the light-incident surface 110.
  • the number of the fixing holes 150 is two, and is located near the two ends of the side.
  • a fixing post 240 integrally formed with the bottom plate 210 is disposed on the bottom plate 210 at a position corresponding to the fixing hole 150.
  • the present invention provides a light guide plate positioning structure and a backlight module thereof, and the light guide plate positioning structure includes a back plate and can be disposed on the back plate.
  • the elastic member Forming and restoring the deformed elastic member, the elastic member is in contact with the light guide plate and fixes the light guide plate above the back plate, and the light guide plate expands due to heat or other reasons due to a certain elastic ratio of the elastic member
  • the elastic member can provide a buffer space for the light guide plate, and deform along with the light guide plate.
  • the elastic member also returns to the original state following the light guide plate, so that the structure can ensure the light guide plate.
  • the positioning structure always maintains the fixing of the light guide plate.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种导光板定位结构及背光模组，所述导光板定位结构包括背板（200）及设置在背板（200）上可以发生形变且恢复形变的弹性件（300），弹性件（300）邻近导光板（100）的侧面设置，包括固定连接于背板（200）上的连接部（320）及定位部（310），定位部（310）的两端分别是固定端和自由端（311），固定端固定连接于连接部（320），自由端（311）与导光板（100）的侧面相互作用以定位导光板（100）。其中，由于弹性件（300）有一定弹性比，当所述导光板（100）因受热或者是其他一些原因而发生膨胀变形时，弹性件（300）可以给导光板（100）—缓冲空间，避免导光板（100）竖直面出现拱起现象；当导光板（100）收缩时，对导光板（100）施加相应的推力，从而保证导光板（100）与背光源（400）之间的耦光距离，提高背光品味，同时如此结构可保证导光板定位结构对导光板的固定。

Description

导光板定位结构及背光模组
技术领域 本发明属于液晶显示技术领域， 尤其涉及一种导光板定位结构及背光模组。
背光模组为液晶显示器的关键零组件之一， 由于液晶面板本身不具发光的 能力， 因此， 需要给液晶显示装置提供背光源。 背光模组的功能即在于供应充 足的亮度及分布均匀的背光源， 使液晶显示器能正常显示影像。 现有技术中， 背光源结构有直下式以及侧入式。 所谓的直下式背光源是指 背光源如 CCFL或 LED晶粒在液晶面板背部列阵， 发出的光线通过扩散板、 棱镜 片等光学膜片形成均一的面背光源； 所谓的侧入式背光源是指背光源置于液晶 面板侧边， 光入射到导光板， 通过导光板把线背光源转为均匀面背光源。 对于 导光板的固定， 如图 4所示， 以往技术一般在导光板 100上设置固定孔 150， 然后 在背板 200上设置固定柱 240， 将导光板 100上的固定孔 150容置于固定柱 240上从 而使导光板 100固定于背板 200上方。 如图 4和图 5所示， 背光源由 LED晶粒 400提供， 当背光模组 10的工作环境发 生变化时，尤其是导光板 100在靠近 LED晶粒 400的位置会由于受到来自 LED晶粒 400所散发的热量或者是吸湿而产生膨胀时， 导光板 100会存在接触背光源 400的 可能使得 LED晶粒 400受到损坏， 且导光板 100采用固定柱 240来固定， 无法在长 度方向延伸， 导致竖直面的翘曲变形。 为了避免发生导光板 100发生翘曲现象， 需要给导光板 100留有足够的活动空间， 即使导光板 100与 LED晶粒 400之间的距 离变大， 这样耦光效率会降低， 大大影响背光的品位。 以 32英寸的单短边入光的模组为例， 如果 PMMA材质的导光板吸湿饱和后， 其长边方向的膨胀量大约为 1.5〜2mm，如果以传统的方式来固定导光板， 需要将 导光板的膨胀预留空间调整至 1.5〜2mm，如果预留足够的空间，耦光距离将变大， 背光效率大约下降有 20%。 因此， 有必要设计一种导光板定位结构及背光模组， 以克服上述缺陷。 发明内容
本发明的目的在于提供一种导光板定位结构及背光模组， 在超窄边框液晶 显示器的单侧入光设计的背光模组中， 以弹性件和背板的组合结构代替原来的 用固定柱固定导光板， 解决了导光板受温度和湿度变化产生伸縮量引起导光板 翘曲变形的问题。 藉由导光板定位结构中与导光板接触设置的弹性件可发生弹 性形变， 随着导光板的伸縮产生相应的形变。 当导光板膨胀变形时， 弹性件可 以给导光板一缓冲空间， 避免导光板竖直面出现拱起现象； 当导光板收縮时， 对导光板施加相应的推力， 从而保证导光板与背光源之间的耦光距离， 提高背 光品味， 同时如此结构可保证导光板定位结构始终保持对导光板的固定。 为了实现上述目的， 本发明提供一种导光板定位结构， 导光板包括一入光 面、 一与入光面相连的出光面及一与入光面相对的侧面， 其特征在于， 所述导 光板定位结构由背板及设置在背板上的弹性件构成， 导光板通过所述弹性件固 定于背板上方， 所述弹性件相邻导光板的侧面设置， 包括： 连接部， 固定连接于所述背板上； 定位部， 定位部的两端分别是固定端和自由端， 固定端固定连接于连接部， 自由端与导光板的侧面相互作用以定位导光板。 优选地， 弹性件固定在所述背板的侧壁或底板上。 优选地， 弹性件材质为金属或者高分子材料。 优选地， 定位部与连接部是一体成型固定连接。 优选地， 连接部为水平块结构， 所述定位部为弧形块结构。 优选地， 定位部与连接部呈一个初始角度连接。 优选地， 弹性件的数量为两个以上。 优选地， 导光板上临近于入光面处设有若干个固定孔， 背板上对应所述固 定孔设有若干个与背板固连一体的固定柱。 本发明的另一目的还在于提供一种背光模组， 包括散热件、 导光板， 导光 板具有一入光面、 一与入光面相连的出光面及一与入光面相对的侧面， 背光源 邻近导光板的入光面固定在散热件上， 背光模组还包括导光板定位结构， 所述 导光板定位结构由背板及设置在背板上的弹性件组成， 导光板通过所述弹性件 固定于背板上， 所述弹性件邻近导光板的侧面设置， 包括： 连接部， 固定连接于所述背板上； 定位部， 定位部的两端分别是固定端和自由端， 固定端固定连接于连接部， 自由端与导光板的侧面相互作用以定位导光板。 优选地， 散热件通过螺丝或铆钉固定在背板上。 优选地， 弹性件固定在所述背板的侧壁或底板上。 优选地， 弹性件材质为金属或者高分子材料。 优选地， 定位部与连接部是一体成型固定连接。 优选地， 连接部为水平块结构， 所述定位部为弧形块结构。 优选地， 定位部与连接部呈一个初始角度连接。 优选地， 弹性件的数量为两个以上。 优选地， 导光板上临近于入光面处设有若干个固定孔， 背板上对应所述固 定孔设有若干个与背板固连一体的固定柱。 相较于现有技术， 本发明的导光板定位结构及背光模组具有以下优点： 导 光板定位结构中与导光板接触设置的弹性件可以在导光板发生膨胀时被压縮， 从而为导光板膨胀提供一缓冲空间， 避免导光板竖直面产生翘曲； 且导光板膨 胀时极易碰撞邻近导光板的入光面设置的背光源， 从而避免了导光板对背光源 的损坏； 弹性件设置于远离入光面的侧面处， 导光板收縮时， 弹性件恢复一定 的形变并对导光板的侧面施加推力， 而入光面处通过固定柱或橡胶块固定， 保 证了导光板与背光源之间的耦光距离， 提高耦光效率。 附图说明 图 1为本发明的背光模组中导光板的工作原理示意图。 图 2为本发明的背光模组中背光源的固定结构示意图。 图 3为图 2的 A-A向剖视图。 图 4为现有技术导光板用固定柱方式固定的结构示意图。 图 5为导光板变形翘曲示意图。 图 6为本发明弹性件的结构示意图。 图 7为本发明实施例 1初始状态下导光板定位结构的装配俯视图。 图 8为图 7的弹性件的状态示意图。 图 9为本发明实施例 1膨胀状态下导光板定位结构的装配俯视图。 图 10为图 9的弹性件的状态示意图。 图 11为本发明实施例 1收縮状态下导光板定位结构的装配俯视图。 图 12为图 11的弹性件的状态示意图。 图 13为本发明实施例 2导光板定位结构的装配剖视图。 具体实施例 为了更好地阐述本发明的技术特点和结构， 以下结合本发明的实施例及其 附图进行详细描述， 其中， 相同的标号始终表示相同的部件。 如图 1所示， 导光板 100的工作原理是利用光学级的压克力 /PC板材， 然后用 具有极高反射率且不吸光的材料， 在光学级的压克力板材底面用 UV网版印刷技 术印上导光点 140。 利用光学级压克力板材吸取从背光源， 即 LED晶粒 400发出 来的光在光学级压克力板材表面的停留， 当光线从入光面 110射到各个导光点 140时， 反射光会往各个角度扩散， 然后破坏反射条件由导光板 100出光面 130射 出。 利用各种疏密、 大小不一的导光点 140， 可使导光板 100均匀发光， 将侧发 光转换成 "面"发光， 再加上反射板 600将接收到的光反射回导光板 100中， 用 来提高光的使用效率。 侧光式背光设计则是把 LED晶粒 400， 配放在背板 200的 边缘， 再用导光板 100把光源传输到屏幕中央区域， 使得整个面板拥有足够的光 源， 导光板 100是背光模组 10中重要的部件之一， 其安装固定的好坏直接影响液 晶显示器的画面质量。 实施例 1 如图 6至图 12所示， 本发明的改进点主要在于导光板的定位方式， 所述导 光板定位结构包括背板 200及设置在所述背板 200上可以发生形变且恢复形变 的弹性件 300构成， 其中所述弹性件 300由金属或者高分子材料制成， 导光板 100通过所述弹性件 300固定于背板 200上。导光板定位结构应用于现有超窄边 框液晶显示器中的侧入式背光模组中时，本实施例中矩形背板 200具有底板 210、 连接至底板 210的两个相对设置的长边侧壁 220和连接至底板 210的两个相对 设置的短边侧壁 230， 导光板 100配置于底板 210上。 导光板 100呈矩形， 设有 一入光面 110，导光板 100还包括与入光面 110相连的出光面 130及与入光面 110 相对的侧面 120。 使用时， 背光模组 10中的 LED晶粒 400邻近于入光面 110设置， 其中， 如 图 2和图 3所示， LED晶粒 400固定于散热件 700上， 散热件 700以螺丝 800 或铆钉 （未示出） 的方式固定在靠近任一短边侧壁 230的底板 210上， 形成单 短边入射方式。 如图 7、 图 9及图 11所示， 本实施例中， 入光面 110侧的导光 板 100通过橡胶块 500固定于底板 210上方，而将弹性件 300设置在导光板 100 远离 LED晶粒 400的侧面 120处。 其中， 所述橡胶块 500固定于背板 200的短 边侧壁 230两端， 且紧夹于导光板 100与散热件 700间， 避免导光板 100碰撞 LED晶粒 400。 如图 6所示， 弹性件 300包括定位部 310和连接部 320， 其中定位部 310的两端 面分别是固定端面和自由端面 311， 固定端面一体成型固定连接于连接部 320。 其中， 本实施例中连接部 320为水平块结构， 定位部 310为弧形块结构， 但并不 以此为限。 所述定位部 310与连接部 320呈一预设的初始角度 Θ连接， 定位部 310 的自由端面 311与连接部 320的自由端面 321存在一个初始距离 LQ， 且弹性件 300 弹性形变不可恢复时定位部 310的自由端面 311与连接部 320的自由端面 321间的 极限距离为 LM。 如图 6至图 12所示，本实施例中，弹性件 300与长边侧壁 220的相对位置固定， 其中， 可通过螺丝将弹性件 300的连接部 320固定在长边侧壁 220上， 也可通过在 长边侧壁 220上设置与所述连接部 320相适配的卡扣结构 （未示出） 将其固定。 然后将导光板侧面 120与定位部 310的自由端面 311接触并由所述定位部 310将其 卡紧。或者是在所述定位部 310上设置与相应处导光板 100结构相适配的凹槽（未 示出）， 将该导光板 100置于凹槽 （未示出） 内， 但由于导光板 100结构一直向更 薄方向发展， 所述弹性件 300若批量生产容易造成浪费， 故本实施例采用上述第 一种结构将导光板 100固定。 如图 7和图 8所示， 固定导光板 100的侧面 120时， 由于初始状态下导光板 100 的长边距离 a大于未安装导光板时定位部自由端面 311到导光板入光面 110安装所 在处的距离， 将导光板 100的侧面 120分别与设置在两相对设置的长边侧壁 210上 的定位部 310的自由端面 311相互接触时， 定位部 310被压縮发生形变， 使导光板 100在初始状态下定位部 310的自由端面 311与连接部 320的自由端面 321距离增 加到 。此时， 定位部 310由于受挤压发生形变从而对导光板 100施加推力 F 在 力？1的作用下促使导光板 100向入光面 110侧靠近。但由于导光板 100的入光面 110 侧采用橡胶块 500固定， 导光板入光面 110在背板 200上的位移没有发生变化， 即 保持耦光距离 D不变。 如图 9和图 10所示， 当背光模组 10工作在高温高湿环境下， 导光板 100发生 膨胀时， 导光板 100的总长度增加 弹性件 300同时进一歩被压縮， 其定位部 310的自由端面 311与连接部 320的自由端面 321的距离增加到 L2， 其中
L。 同样地， 弹性件 300由于受挤压从而对导光板 100施加推力 F2， 在力 F2的作用 下， 依然可以保持相应的耦光距离 D， 其中 1^2在弹性件 300的可恢复弹性形变范 围内， 即 L2<LM。 如图 11和图 12所示， 当温度和湿度降低， 导光板 100冷却收縮时， 导光板 100 的总长度减少 Δ 1， 此时弹性件 300的部分应力被释放， 其定位部 310的自由端面 311与连接部 320的自由端面 321的距离变为到 L3， 其中 Ι^= - Δ 1。 值得注意的 是， L3在该弹性件 300的形变范围内， 即 L3>LQ。 导光板 100仍受到弹性件 300施 加的推力 F3， 同样可以保持相应的耦光距离0。 可以理解的是， 弹性件 300的形状可以是多种形式的。 实施例 2 实施例 2的导光板定位结构相似于实施例 1中的导光板定位结构， 如图 13所 示， 其不同之处在于： 所述弹性件 300与底板 210的相对位置固定， 即弹性件 300 的连接部 320固定连接于底板 210上。 其中， 可沿导光板 100的侧面 120在底板 210 上设置若干个弹性件 300而非两个， 其固定强度更佳。 另外， 与实施例 1不同的 是， 本实施例中导光板 100其入光面 110侧通过设置在底板 210上的固定柱 240来 固定。 如图 4所示， 位于出光面 130上且临近于入光面 110的侧边附近对称设有若 干个固定孔 150， 此处固定孔 150的数量为两个， 位于所述侧边两端附近。 底板 210上对应所述固定孔 150的位置设有与底板 210—体成型的固定柱 240， 通过将 固定柱 240容纳于固定孔 150内， 从而将导光板 100的入光面 110—端固定于背板 200上， 同样导光板入光面 110到 LED晶粒 400距离为耦光距离0。 综上所述， 为避免传统的导光板固定方式的不良效果， 本发明提供了一种 导光板定位结构及其背光模组， 导光板定位结构包括背板及设置在所述背板上 可以发生形变且恢复形变的弹性件构成， 弹性件与导光板相接触并将该导光板 固定在背板上方， 由于弹性件有一定弹性比， 当所述导光板因受热或者是其他 一些原因而发生膨胀变形时， 弹性件可以给导光板一缓冲空间， 跟随该导光板 一起发生形变， 当所述导光板形变恢复时， 弹性件也跟随所述导光板恢复到原 来的状态， 如此结构可保证导光板定位结构始终保持对所述导光板的固定。 虽然本发明是参照其示例性的实施例被具体描述和显示的， 但是本领域的 普通技术人员应该理解， 在不脱离由权利要求限定的本发明的精神和范围的情 况下， 可以对其进行形式和细节的各种改变。

Claims

权 利 要 求 书
1、 一种导光板定位结构， 导光板包括一入光面、 一与入光面相连的出光面 及一与入光面相对的侧面， 其中， 所述导光板定位结构由背板及设置在所述背 板上的弹性件组成， 导光板通过所述弹性件固定于背板上， 所述弹性件邻近导 光板的侧面设置， 包括： 连接部， 固定连接于所述背板上； 定位部， 定位部的两端分别是固定端和自由端， 固定端固定连接于连接部， 自由端与导光板的侧面相互作用以定位导光板。
2、 根据权利要求 1所述的导光板定位结构， 其中， 所述弹性件固定在所述 背板的侧壁上。
3、 根据权利要求 1所述的导光板定位结构， 其中， 所述弹性件固定在所述 背板的底板上。
4、 根据权利要求 1所述的导光板定位结构， 其中， 所述弹性件材质为金属 材料。
5、 根据权利要求 1所述的导光板定位结构， 其中， 所述弹性件材质为高分 子材料。
6、 根据权利要求 1所述的导光板定位结构， 其中， 所述定位部与连接部是 一体成型固定连接。
7、 根据权利要求 1所述的导光板定位结构， 其中， 所述连接部为水平块结 构， 所述定位部为弧形块结构。
8、 根据权利要求 1所述的导光板定位结构， 其中， 所述定位部与连接部呈 一个初始角度连接。
9、 根据权利要求 1所述的导光板定位结构， 其中， 所述弹性件的数量为两 个以上。
10、 根据权利要求 1 所述的导光板定位结构， 其中， 所述导光板上临近于 入光面处设有若干个固定孔， 背板上对应所述固定孔设有若干个与背板固连一 体的固定柱。
11、 一种背光模组， 包括散热件、 导光板， 导光板具有一入光面、 一与入 光面相连的出光面及一与入光面相对的侧面， 背光源邻近导光板的入光面固定 在散热件上， 其中， 背光模组还包括导光板定位结构， 所述导光板定位结构由 背板及设置在背板上的弹性件组成， 导光板通过所述弹性件固定于背板上， 所 述弹性件邻近导光板的侧面设置， 包括： 连接部， 固定连接于所述背板上； 定位部， 定位部的两端分别是固定端和自由端， 固定端固定连接于连接部， 自由端与导光板的侧面相互作用以定位导光板。
12、 根据权利要求 11所述的背光模组， 其中， 所述弹性件固定在所述背板 的侧壁上。
13、 根据权利要求 11所述的背光模组， 其中， 所述弹性件固定在所述背板 的底板上。
14、根据权利要求 11所述的背光模组， 其中， 所述弹性件材质为金属材料。
15、 根据权利要求 11所述的背光模组， 其中， 所述弹性件材质为高分子材 料。
16、 根据权利要求 11所述的背光模组， 其中， 所述定位部与连接部是一体 成型固定连接。
17、 根据权利要求 11所述的背光模组， 其中， 所述连接部为水平块结构， 所述定位部为弧形块结构。
18、 根据权利要求 11所述的背光模组， 其中， 所述定位部与连接部呈一个 初始角度连接。
19、 根据权利要求 11所述的背光模组， 其中， 所述弹性件的数量为两个以 上。
20、 根据权利要求 11所述的背光模组， 其中， 所述导光板上临近于入光面 处设有若干个固定孔， 背板上对应所述固定孔设有若干个与背板固连一体的固 定柱。
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