WO2014201806A1 - 导光板及应用其的背光模组、显示装置 - Google Patents

导光板及应用其的背光模组、显示装置 Download PDF

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Publication number
WO2014201806A1
WO2014201806A1 PCT/CN2013/088003 CN2013088003W WO2014201806A1 WO 2014201806 A1 WO2014201806 A1 WO 2014201806A1 CN 2013088003 W CN2013088003 W CN 2013088003W WO 2014201806 A1 WO2014201806 A1 WO 2014201806A1
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WO
WIPO (PCT)
Prior art keywords
light
light guide
guide plate
led lamp
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/CN2013/088003
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English (en)
French (fr)
Inventor
张财政
李敬石
金亨奎
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.)
BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Beijing BOE 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 BOE Technology Group Co Ltd, Beijing BOE Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US14/386,957 priority Critical patent/US9678265B2/en
Publication of WO2014201806A1 publication Critical patent/WO2014201806A1/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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02B6/009—Positioning aspects of the light source in the package
    • 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
    • G02B6/0091—Positioning aspects of the light source relative to the light guide

Definitions

  • the invention relates to a light guide plate and a backlight module and a display device using the same. Background technique
  • the light guide plate is an important component in the side-lit backlight module for converting a line source into a uniform surface source.
  • the backlight module mainly includes a reflective film 11, a light guide plate 12, a diffusion film 13, a prism film 14, a light bar 15, and a back plate 16.
  • the LED strip 15 includes a printed circuit board (PCB) 151 and a plurality of LEDs (Light-Emitting Diodes) 152 soldered on the PCB 151.
  • the light incident surface 121 of the side of the light plate 12 is opposite to enable the light emitted from the LED lamp 152 to enter the light guide plate 12 from the light incident surface 121. After the light is refracted and/or reflected in the light guide plate 12, the light is emitted from the top of the light guide plate 12.
  • the light exit surface 122 is emitted.
  • the diffusion film 13 and the prism film 14 are used to condense light emitted from the light-emitting surface within a specified viewing angle range.
  • the LED light bar 15 needs to be bonded to the back plate 16 through the light bar fixing tape 17 , and then the light guide plate 12 is stuck on the back plate of the back plate 16 .
  • the light emitting surface of the LED lamp 152 is opposed to the light incident surface 121 on the side of the light guide plate 12. Since the installation of the LED light bar 15 and the installation of the light guide plate 12 are performed separately, it is ensured that the light emitting surface of the LED lamp 152 is completely opposite to the light incident surface of the light guide plate 12 (ie, as shown by the dotted line in FIG.
  • the LED light It is difficult for the light-emitting center line 153 of 152 to coincide with the light-receiving center line 123 of the light guide plate 12.
  • a hot spot phenomenon is likely to occur on the light-emitting surface 121 of the light guide plate 12, as shown in FIG. 2, wherein the solid line with an arrow indicates that the LED light 152 is emitted. The route of light.
  • the embodiment of the invention provides a light guide plate and a backlight module and a display device using the same, which solves the problem that in the existing backlight module, the light-emitting center line of the LED lamp and the light-receiving center line of the light guide plate are ensured. It is a difficult problem to overlap.
  • a light guide plate is provided for guiding light emitted by an LED lamp on an LED light bar, and a light receiving surface is disposed on a light incident surface of the light guide plate, so that the LED light card is provided.
  • the illumination center line of the LED lamp coincides with the light receiving center line of the light guide plate.
  • the shape of the groove is an inverted cone shape.
  • the shape of the groove is a shape that matches the shape of the LED lamp.
  • a plurality of grooves are formed on the light incident surface of the side of the light guide plate, and the plurality of grooves are identical in shape and equally spaced, and the centers of the bottoms of the plurality of grooves are on the same horizontal line. .
  • an embodiment of the present invention further provides a backlight module, including an LED light bar, the backlight module further includes the above-mentioned light guide plate, and the LED light on the LED light bar is stuck in the guide In the groove of the light incident surface on the side of the light plate.
  • the printed circuit board on the LED strip is fixedly connected to the light incident surface on the top of the recess.
  • the printed circuit board is fixedly attached to the light incident surface at the top of the recess by an adhesive.
  • a gap is formed between the light emitting surface of the LED lamp and the light incident surface of the bottom of the groove.
  • a display device including a display panel and the backlight module described above is further provided according to an embodiment of the invention.
  • FIG. 1 is a partial cross-sectional view of a conventional backlight module
  • FIG. 2 is a partial cross-sectional view of a light guide plate and an LED light bar in the backlight module shown in FIG. 1;
  • FIG. 6 is a partial cross-sectional view of the backlight module according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention provides a light guide plate 32, as shown in FIG. 3, for guiding the light emitted by the LED lamp 352 on the LED light bar 35, and the light incident surface 381 on the side of the light guide plate 32 is provided with a groove. 38.
  • the illumination center line 353 of the LED lamp 352 coincides with the light receiving center line 322 of the light guide plate 32.
  • the LED lamp acts as a lighting unit for providing the light required by the backlight. Due to factors such as the characteristics of the LED and the shape of the backplane, the illumination areas of different LED lamps are also different.
  • the illuminating center line of the LED lamp is defined here, and the illuminating center line is a line segment located at the center of the illuminating area of the LED lamp, and the illuminating center line is used to identify the illuminating area of the LED lamp, which can be further used for grasping the LED The lighting of the lamp.
  • the light incident surface of the light guide plate is for receiving incident light. Therefore, the line segment defining the center of the light incident surface of the light guide plate is the light receiving center line of the light guide plate, and the light receiving center line is used to identify the region of the light incident surface of the light guide plate.
  • the working principle of the light guide plate is to use the bottom mesh point to destroy the interference phenomenon of the light, and uniformly convert the point light source or the line light source into a surface light source, the function of which is to guide the scattering direction of the light, improve the brightness of the liquid crystal panel and ensure the brightness of the liquid crystal panel. Uniformity. It should be noted that the design of the dot distribution at the bottom of the light guide plate is performed under the premise that the light-emitting center line of the LED lamp can coincide with the light-receiving center line of the light guide plate, if the light-emitting center line of the LED light cannot be combined with the light-receiving center line of the light guide plate.
  • the light emitted by the LED light cannot be reflected or refracted in the light guide plate according to the preset optical path, which may result in uneven light distribution and increased total reflection inside the light guide plate, thereby causing uneven brightness of the liquid crystal panel. Hot spots are generated, which also reduces the overall brightness of the LCD panel.
  • the illumination center line 353 of the LED lamp 352 can receive light from the light guide plate 32.
  • the heart lines 322 coincide, thus reducing the difficulty of the coincidence of the two centerlines.
  • the above hot spots can be eliminated when the two center lines coincide.
  • the light guide plate 32 since the light can be propagated according to the preset optical path, unnecessary loss in the light propagation process is reduced, and thus, the illumination center line 353 of the LED lamp 352 cannot be avoided.
  • the light-receiving center line 322 of the light guide plate 32 overlaps, the brightness of the liquid crystal display panel is lowered.
  • the shape of the groove 38 may be an inverted cone shape.
  • the shape is set based on the shape of the LED lamp 352 commonly used in the conventional liquid crystal display. Since the opening portion of the inverted cone is larger than the bottom portion, when the LED lamp 352 is mounted in the recess 38, the LED lamp 352 easily enters the concave shape.
  • the slot 38 facilitates the mounting of the LED lamp 352.
  • the inverted tapered shape has a self-correcting function such that the light-emitting center line 353 of the LED lamp 352 coincides with the light-receiving center line 322 of the light guide plate 32.
  • the shape of the groove 38 may be a shape matching the shape of the LED lamp 352.
  • the arrangement can not only make the LED lamp 352 be stably stuck in the recess 38, but also increase the tightness between the light guide plate 32 and the LED lamp 352 to reduce the gap between the light guide plate 32 and the LED lamp 352.
  • the amount of light leakage produced may be cylindrical or semi-spherical or other common groove shape.
  • the shape of the groove 38 is not limited to the inverted cone and the shape matching the shape of the LED lamp 352. Any shape that enables the LED lamp 352 to be locked in the groove 38 can be used in the present invention. . It can be understood by those skilled in the art that the shape of the groove 38 described above is inversely tapered or the shape matching the shape of the LED lamp 352 is only a preferred embodiment of the light guide plate of the embodiment of the present invention rather than the only implementation. the way.
  • the LED lamp may include a plurality of LED light-emitting units, in order to make each LED light-emitting unit coincide with the light-receiving center line of the light guide plate, another embodiment of the light guide plate of the embodiment of the present invention is proposed.
  • a plurality of grooves are formed on the light incident surface of the side of the light guide plate, and the plurality of grooves are identical in shape and equally spaced, and the centers of the bottoms of the plurality of grooves are on the same horizontal line.
  • the light-emitting center line of the LED light can coincide with the light-receiving center line of the light guide plate, so that only the LED light is stuck In the groove of the light guide plate, the center line of the light of the LED lamp can coincide with the light receiving center line of the light guide plate, which reduces the difficulty of the coincidence of the two center lines.
  • the two centerlines coincide To eliminate hot spots.
  • an embodiment of the present invention further provides a backlight module, as shown in FIG. 6, which includes a reflective film 31, a diffusion film 33, a prism film 34, an LED light bar 35, and a back plate 37.
  • the backlight module further includes the light guide plate 32 described in the above embodiment, and the LED lamp 352 on the LED light bar 35 is disposed in the groove 38 of the light incident surface on the side of the light guide plate 32.
  • the functions of the reflective film 31, the diffusion film 33, and the prism film 34 are the same as those of the corresponding components in the conventional backlight module, and will not be described herein.
  • the top 382 of the recess and the printed circuit board 351 on the LED strip 35 can be Fixedly attached to the light incident surface at the top of the groove.
  • the groove is disposed on the light incident surface of the side of the light guide plate and is recessed inside the light guide plate, so that the side portion of the light guide plate except the groove is referred to as a groove. top. Connecting the top 382 of the light guide plate recess to the printed circuit board 351 on the LED strip 35 facilitates the stability of the LED lamp 352 in the recess 38.
  • the LED lamp 352 can be more stabilized by fixing the top 382 of the recess 38 to the printed circuit board 351 on the LED strip 35. The ground is snapped into the recess 38.
  • the manner in which the LED lamp 352 is stuck on the recess 38 is not limited to the fixed connection of the top 382 of the recess shown in FIG. 4 to the printed circuit board 351 on the LED strip 35.
  • the surface of the recess 38 may be secured by the design of a suitable recess shape to allow the LED lamp 352 to enter the recess 38, or other means known to those skilled in the art.
  • the printed circuit board 351 can be closely attached to the top 382 of the recess as shown in Figs. 3 and 4, or there may be a gap as shown in FIG.
  • the backlight module provided by the embodiment of the present invention is as shown in FIG. 4, wherein the top of the groove in the light guide plate 32 can be fixedly coupled to the printed circuit board 351 through the adhesive 36.
  • the printed circuit board 351 is made of a polyimide or a polyester film
  • the light guide plate 32 is made of an optical grade acrylic sheet, in view of the materials of both, and for assembling the tube and lifting the joint.
  • the stability of the present invention, in the embodiment of the present invention may also use a double-sided tape or other bonding material to securely connect the printed circuit board to the light-incident surface of the top of the groove, which will not be described herein.
  • the light guide plate can be formed by stamping or injection molding; and the groove provided on the light incident surface of the light guide plate can be synchronously completed during the preparation process of the light guide plate, or can be etched, The steps of cutting and the like are completed in the subsequent steps of the light guide plate.
  • the backlight module provided by the embodiment of the present invention may have a gap between the light emitting surface 354 of the LED lamp 352 and the light incident surface 381 at the bottom of the groove.
  • the LED lamp 352 and the light guide plate 32 are not as close as possible, and the distance is too close, so that the light of the light guide plate 32 near the LED lamp 352 may be too strong, which is not conducive to uniformity of light output.
  • the distance between the light guide plate 32 and the LED lamp 352 can be determined according to factors such as the distribution of the dot at the bottom of the light guide plate 32 and the shape and size of the LED lamp 352.
  • the proper pitch can make the brightness and display uniformity of the liquid crystal panel and the like. Get promoted.
  • the light emitting surface of the LED lamp 352 is completely accommodated in the recess 38 of the light guide plate 32, the light emitting surface 354 of the LED lamp 352 is completely surrounded by the light guide plate 32, and the light emitting surface of the LED lamp 352 is illuminated.
  • the light emitted by the 354 is wrapped in the light guide plate 32.
  • the embodiment of the present invention can solve the problem and thereby reduce the problem.
  • Optical loss effectively improving the utilization of light.
  • the solid line with arrows in Figure 5 is the running path for the LED light 352 to emit light.
  • the brightness is uniform, the light energy utilization rate is high, the brightness is high, and the mechanical performance is stable.
  • the LED lamp 352 on the LED light bar 35 is firstly disposed in the groove 38 of the light guide plate 32, and the light guide plate can be ensured by the adhesive 36 in FIG. 32 and the LED strip 35 are firmly coupled together to ensure alignment of the LED lamp 352 with the light guide plate 32, and then the light guide plate 32 with the LED strip 35 is inserted into the back plate 37. Since the backing plate 37 and the LED light bar 35 do not need to be bonded by the light bar fixing tape, the problem of the production efficiency of the backlight module caused by the misalignment of the LED light bar and the back plate in the existing backlight template is avoided. At the same time, the assembly efficiency of the backlight module is also improved.
  • the embodiment of the invention further provides a display device comprising a display panel and the backlight module described above.
  • a display device comprising a display panel and the backlight module described above.

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

Abstract

一种导光板及应用其的背光模组、显示装置，该导光板（32）用于导引LED灯条（35）上的LED灯（352）发出的光线，导光板（32）侧部的入光面（381）上设有凹槽（38），LED灯（352）卡设在凹槽（38）中时，LED灯（352）的发光中心线（353）与导光板（31）的受光中心线（322）重合。该背光模组包括导光板（32），该显示装置包括上述背光模组。

Description

导光板及应用其的背光模组、 显示装置 技术领域
本发明涉及导光板及应用其的背光模组、 显示装置。 背景技术
导光板是侧入式背光模组中的一个重要组件， 用于将线光源转换成均匀 的面光源。
图 1为现有背光模组的局部剖视图， 该背光模组主要包括： 反射膜 11、 导光板 12、 扩散膜 13、 棱镜膜 14、 灯条 15、 背板 16。 其中， LED灯条 15 包括印刷电路板 ( Printed Circuit Board, 筒称 PCB ) 151和焊接在该 PCB151 上的多个 LED灯（ Light-Emitting Diode, 发光二极管） 152, LED灯 152的 发光面与导光板 12侧部的入光面 121相对， 以使 LED灯 152发出的光线能 从该入光面 121射入导光板 12, 光线在导光板 12内折射和 /或反射后会从导 光板 12顶部的出光面 122射出。扩散膜 13和棱镜膜 14用于将从出光面射出 的光线汇聚在指定的视角范围内。
在组装上述背光模组时， 如图 1所示， 需要先将 LED灯条 15通过灯条 固定胶带 17粘结在背板 16上， 再将导光板 12卡在背板 16的卡口上， 以使 LED灯 152的发光面与导光板 12侧部的入光面 121相对。由于 LED灯条 15 的安装与导光板 12的安装是分开进行的， 因此要保证 LED灯 152的发光面 与导光板 12的入光面完全正对（即如图 1中虚线所示， LED灯 152的发光 中心线 153与导光板 12的受光中心线 123重合）难度较大。 当 LED灯 152 的发光面与导光板 12的入光面不能完全正对时， 导光板 12的出光面 121上 容易发生热点现象，如图 2所示，其中带箭头实线表示 LED灯 152发出光线 的传播路线。 发明内容
本发明的实施例提供一种导光板及应用其的背光模组、 显示装置， 解决 了在现有的背光模组中，保证 LED灯的发光中心线与导光板的受光中心线准 确重合的难度较大的问题。
根据本发明实施例， 提供了一种导光板， 用于导引 LED灯条上的 LED 灯发出的光线，所述导光板侧部的入光面上设有凹槽，使得所述 LED灯卡设 在所述 槽中时， 所述 LED灯的发光中心线与所述导光板的受光中心线重 合。
优选， 所述 槽的形状为倒锥形。
或者， 优选地， 所述凹槽的形状为与所述 LED灯外形匹配的形状。 在一些实施例中， 所述导光板侧部的入光面上设有多个凹槽， 所述多个 凹槽形状相同且等间距分布， 所述多个凹槽底部的中心在同一水平线上。
另一方面， 根据本发明实施例还提供了一种背光模组， 包括 LED灯条， 所述背光模组还包括上述的导光板， 所述 LED灯条上的 LED灯卡设在所述 导光板侧部的入光面的 槽中。
进一步地， 所述 LED灯卡设在所述凹槽中时， 所述 LED灯条上的印刷 电路板固定连接在所述凹槽顶部的入光面上。
优选地， 所述印刷电路板通过粘结剂固定连接在所述凹槽顶部的入光面 上。
进一步地， 所述 LED灯的发光面与所述凹槽底部的入光面之间具有间 隙。
另一方面， 根据本发明实施例还提供了一种显示装置， 包括显示面板和 上述的背光模组。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作筒单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1为现有背光模组的局部剖视图；
图 2为图 1所示的背光模组中导光板与 LED灯条的局部剖视图； 图 3为本发明实施例提供的安装有 LED灯条的导光板的局部剖视图； 图 4为图 3所示导光板与 LED灯条的一种联接方式的示意图； 图 5为图 3所示导光板与 LED灯条另一种联接方式的示意图； 图 6为本发明实施例提供的背光模组的局部剖视图。 具体实施方式
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 清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而 不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有作 出创造性劳动的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。
本发明实施例提供了一种导光板 32, 如图 3所示， 用于导引 LED灯条 35上的 LED灯 352发出的光线，导光板 32侧部的入光面 381上设有凹槽 38, 使得 LED灯 352卡设在凹槽 38中时， LED灯 352的发光中心线 353与导光 板 32的受光中心线 322重合。
首先， 对 LED灯的发光中心线以及导光板的受光中心线进行一下解释。 LED灯作为一种发光单元， 用于提供背光源所需的光线。 受限于 LED的特 性、 背板的形状等因素的影响， 不同 LED灯的发光区域也是各不相同。 为了 确定 LED灯的发光区域， 在此定义了 LED灯的发光中心线， 该发光中心线 为位于 LED灯发光区域中心的线段， 利用该发光中心线标识 LED灯的发光 区域， 进一步可用于掌握 LED灯的发光情况。 同样道理， 导光板的入光面用 于接收入射光线， 因此定义导光板入光面区域中心的线段为导光板的受光中 心线， 利用该受光中心线标识导光板入光面的区域范围。
导光板的工作原理是利用其底部网点来破坏光的干涉现象， 将点光源或 线光源均匀地转换成面光源， 其作用在于引导光线的散射方向， 提高液晶面 板的亮度并确保液晶面板亮度的均匀性。 需要注意的是， 导光板底部网点分 布的设计是在 LED灯的发光中心线能与导光板的受光中心线重合的前提下 进行的， 若 LED灯的发光中心线不能与导光板的受光中心线重合， 则 LED 灯发出的光不能按照预设的光路在导光板内反射或折射， 就有可能产生光线 分布不均以及在导光板内部全反射增多等情况， 进而造成液晶面板的亮度不 均， 产生热点现象， 还会降低液晶面板的整体亮度。
本发明实施例提供的导光板 32中，由于设置了凹槽 38,且在 LED灯 352 卡设在凹槽 38中时， LED灯 352的发光中心线 353能与导光板 32的受光中 心线 322重合， 因此降低了两条中心线重合的难度。 而且， 当两条中心线重 合时可以消除上述的热点现象。
另夕卜，在上述实施例提供的导光板 32中，由于光能够按照预设光路传播， 减少了光传播过程中不必要的损耗， 因而，避免了由于 LED灯 352的发光中 心线 353不能与导光板 32的受光中心线 322重合时产生的液晶显示面板亮度 下降的缺陷。
上述实施例提供的导光板 32中， 凹槽 38的形状可以为倒锥形。 该形状 是基于现有液晶显示器中常用的 LED灯 352的形状来设定的，由于倒锥形的 开口部比底部截面大， 在凹槽 38中安装 LED灯 352时， LED灯 352容易进 入凹槽 38, 以便于 LED灯 352的安装。 且倒锥形的形状具有自校正的功能， 使得 LED灯 352的发光中心线 353与导光板 32的受光中心线 322重合。
上述实施例提供的导光板 32中， 凹槽 38的形状可以为与 LED灯 352 外形匹配的形状。 这样设置不仅可以使 LED灯 352容易稳固地卡设在凹槽 38中， 也可以增加导光板 32与 LED灯 352之间的紧密性， 以减少由于导光 板 32与 LED灯 352之间存在缝隙而产生的漏光的量。 举例来说， 根据 LED 灯 352外形的不同，与之匹配的凹槽 38的形状可为圓柱形或者半圓球形或者 其它常见的凹槽形状。
需要说明的是:上述的凹槽 38的形状并不局限于倒锥形及与 LED灯 352 外形匹配的形状， 任何能使 LED灯 352卡设在凹槽 38中的形状都能用于本 发明。本领域技术人员可以理解的是，上述的凹槽 38的形状为倒锥形或者为 与 LED灯 352外形匹配的形状仅是本发明实施例导光板一种较为优选的实施 方式而不是唯一的实施方式。
另夕卜， 需要补充的一点是， 由于 LED灯中可能包括多个 LED发光单元， 为使每个 LED发光单元均与导光板的受光中心线重合，在此提出本发明实施 例导光板的另一种具体实施方式： 导光板侧部的入光面上设有多个凹槽， 多 个凹槽形状相同且等间距分布， 多个凹槽底部的中心在同一水平线上。
本发明实施例的导光板，由于设置了凹槽，使得 LED灯卡设在凹槽中时， LED灯的发光中心线能与导光板的受光中心线重合， 因此仅通过将 LED灯 卡设在导光板的凹槽中，就可以实现 LED灯的发光中心线能与导光板的受光 中心线重合， 降低了两条中心线重合的难度。 而且， 当两条中心线重合时可 以消除热点现象。
另一方面， 本发明实施例还提供了一种背光模组， 如图 6所示， 其中包 括反射膜 31、 扩散膜 33、 棱镜膜 34、 LED灯条 35及背板 37。 该背光模组 中还包括上述实施例描述的导光板 32, LED灯条 35上的 LED灯 352卡设在 导光板 32侧部的入光面的凹槽 38中。 其中， 反射膜 31、 扩散膜 33和棱镜 膜 34的作用与现有背光模组中相应组件的功能相同， 在此不再赘述。
如图 4所示， 在本发明实施例的背光模组的导光板 32中， LED灯 352 卡设在凹槽 38中时， 凹槽的顶部 382与 LED灯条 35上的印刷电路板 351 可以固定连接在凹槽顶部的入光面上。 需要说明的是， 观察图 4可以发现， 凹槽设置在导光板侧部的入光面上且是向导光板内部凹陷的， 因此将除凹槽 之外的导光板侧部区域称之为凹槽顶部。将导光板凹槽的顶部 382与 LED灯 条 35上的印刷电路板 351连接在一起， 有利于提高 LED灯 352在凹槽 38 中的稳固性。 如果 LED灯 352的外形尺寸较小， 而凹槽 38的外形尺寸较大 时，通过将凹槽 38的顶部 382与 LED灯条 35上的印刷电路板 351固定连接， 可以保证 LED灯 352更加稳固地卡设在凹槽 38中。
需要说明的是： 本发明实施例中， 使 LED灯 352卡设在凹槽 38上的方 式不限于图 4所示的凹槽的顶部 382与 LED灯条 35上的印刷电路板 351固 定连接这种方式，也可以是通过设计合适的凹槽形状，使 LED灯 352进入到 凹槽 38内时， 被凹槽 38的表面卡固， 或者是本领域技术人员所知的其它方 式。 LED灯 352卡固在凹槽 38中时， 印刷电路板 351可以与凹槽的顶部 382 如图 3和图 4所示紧密贴合， 也可以如图 5所示存在一定间隙。
进一步的本发明实施例提供的背光模组， 如图 4所示， 其中导光板 32 中凹槽的顶部可以通过粘结剂 36与印刷电路板 351 固定联接。 印刷电路板 351是以聚酰亚胺或聚酯薄膜为基材制成的，导光板 32是利用光学级的压克 力板材制成的， 鉴于二者材质， 同时为了组装筒便和提升联接的稳固性， 本 然， 本发明实施例还可采用双面胶或者其它粘接材料将印刷电路板固定连接 在凹槽顶部的入光面上， 在此不做赘述。
需要补充的一点是： 导光板可以通过沖压或者注塑等方式成形； 而导光 板入光面上设置的凹槽可在导光板制备过程中同步制作完成，亦可通过刻蚀、 切割等步骤在导光板后续步骤中完成。
进一步的本发明实施例提供的背光模组， 如图 5 所示， 其中导光板 32 中 LED灯 352的发光面 354与凹槽底部的入光面 381之间可以具有间隙。在 实践中发现： LED灯 352与导光板 32之间并不是越紧密越好， 距离太近， 就有可能使导光板 32靠近 LED灯 352的一侧光线过强， 不利于出光的均一 性， 但是距离太远， 又有可能造成不必要的光能损失。 因此， 导光板 32 与 LED灯 352之间的距离可以根据导光板 32底部的网点分布及 LED灯 352的 形状大小等因素来确定的， 合适的间距会使液晶面板的亮度和显示均一性等 性能获得提升。
同时， 如图 3-5所示， 由于 LED灯 352的发光面完全容纳在导光板 32 的凹槽 38中， 使 LED灯 352的发光面 354完全被导光板 32包围， LED灯 352的发光面 354射出的光均被包裹在导光板 32中， 而现有的背光模组中， 由于 LED灯的发光面未被导光板包围，存在漏光的问题，本发明实施例能解 决该问题， 从而减少光损耗， 有效地提高了光的利用率。 图 5中的带箭头实 线为 LED灯 352发出光线的运行路线。
本发明实施例提供的背光模组中， 由于使用上述实施例描述的导光板 32, 因此具有亮度均匀， 光能利用率高、 亮度高， 机械性能稳固等优点。
另外， 在组装本发明实施例提供的背光模组时， 先将 LED灯条 35上的 LED灯 352卡设在导光板 32的凹槽 38中， 可以借助图 6中的黏胶 36保证 导光板 32和 LED灯条 35稳固地联接在一起， 保证了 LED灯 352与导光板 32的对位， 然后将卡设有 LED灯条 35的导光板 32插到背板 37中。 由于背 板 37和 LED灯条 35之间不需要用灯条固定胶带粘结，这样就避免现有背光 模板中 LED灯条与背板的错位粘结造成的背光模组生产良率降低的问题，同 时， 也提高了背光模组的组装效率。
本发明实施例还提供一种显示装置， 包括显示面板和上述的背光模组。 以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限 于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易 想到的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保 护范围应以所述权利要求的保护范围为准。

Claims

权利要求书
1、 一种导光板， 用于导引 LED灯发出的光线， 其中， 所述导光板侧部 的入光面上设有凹槽， 使得所述 LED灯卡设在所述凹槽中时， 所述 LED灯 的发光中心线与所述导光板的受光中心线重合。
2、 根据权利要求 1所述的导光板， 其中， 所述凹槽的形状为倒锥形。
3、根据权利要求 1所述的导光板，其中，所述凹槽的形状为与所述 LED 灯外形匹配的形状。
4、 根据权利要求 1-3任一项所述的导光板， 其中， 所述导光板侧部的入 光面上设有多个凹槽， 所述多个凹槽形状相同且等间距分布， 所述多个凹槽 底部的中心在同一水平线上。
5、 一种背光模组， 包括 LED灯条， 其中， 所述背光模组还包括权利要 求 1—4任一项所述的导光板， 所述 LED灯条上的 LED灯卡设在所述导光板 侧部的入光面的凹槽中。
6、 根据权利要求 5所述的背光模组， 其中， 所述 LED灯卡设在所述凹 槽中时， 所述 LED灯条上的印刷电路板固定连接在所述凹槽顶部的入光面 上。
7、根据权利要求 6所述的背光模组， 其中， 所述印刷电路板通过粘结剂 固定连接在所述凹槽顶部的入光面上。
8、 根据权利要求 6所述的背光模组， 其中， 所述 LED灯的发光面与所 述凹槽底部的入光面之间具有间隙。
9、一种显示装置，包括显示面板和权利要求 5-8任一项所述的背光模组。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115047556A (zh) * 2022-06-07 2022-09-13 安徽康佳电子有限公司 一种窄边侧入式液晶电视背光结构

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104298003A (zh) * 2014-10-21 2015-01-21 京东方科技集团股份有限公司 一种背光源及显示装置
CN104698529A (zh) * 2015-03-27 2015-06-10 深圳市华星光电技术有限公司 导光板及具有该导光板的背光模块和液晶显示器
CN104834050A (zh) * 2015-05-19 2015-08-12 武汉华星光电技术有限公司 导光板、背光模组以及液晶显示装置
CN105425333A (zh) * 2016-01-05 2016-03-23 京东方科技集团股份有限公司 一种导光基板、背光模组及显示装置
CN105759340A (zh) * 2016-03-04 2016-07-13 京东方科技集团股份有限公司 一种导光板、背光模组及显示装置
CN105551389A (zh) * 2016-03-07 2016-05-04 京东方科技集团股份有限公司 显示面板及显示装置
CN105589126A (zh) * 2016-03-21 2016-05-18 安比斯特殊玻璃（苏州）有限公司 一种复合型导光板及其液晶显示模组
CN106383417A (zh) * 2016-08-29 2017-02-08 合肥惠科金扬科技有限公司 一种液晶显示屏背光结构生产方法
CN108627906A (zh) * 2017-03-17 2018-10-09 致伸科技股份有限公司 背光结构
US10113708B1 (en) 2017-04-28 2018-10-30 Rev-A-Shelf Company, Llc Edge lighted panel
CN107748408A (zh) * 2017-11-03 2018-03-02 惠科股份有限公司 发光定位装置及其制造方法
WO2019085162A1 (zh) * 2017-11-03 2019-05-09 惠科股份有限公司 发光定位装置
CN107765479A (zh) * 2017-11-03 2018-03-06 惠科股份有限公司 发光定位装置及其制造方法
CN107728378A (zh) * 2017-11-03 2018-02-23 惠科股份有限公司 发光定位装置及其制造方法
CN111221180B (zh) * 2020-01-20 2022-05-13 京东方科技集团股份有限公司 一种背光源及显示装置
CN112965296A (zh) * 2021-03-17 2021-06-15 深圳创维－Rgb电子有限公司 背光模组和显示装置
CN115218139A (zh) * 2021-04-19 2022-10-21 江苏极能照明科技有限公司 一种提高导光效果的导光板及加工方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102141647A (zh) * 2011-05-04 2011-08-03 中国科学院深圳先进技术研究院 导光板及含有该导光板的led灯具
US20120294033A1 (en) * 2011-05-18 2012-11-22 Kocam International Co., Ltd. Backlight Module with Three-Dimensional Circuit Structure and Extrusion Housing
EP2527889A1 (en) * 2011-05-25 2012-11-28 Kocam International Co.Ltd. Backlight module with three-dimensional circuit structure and extrusion Housing
CN202580939U (zh) * 2012-04-09 2012-12-05 苏州世鼎电子有限公司 具有v型切槽结构的led背光模组
CN202583503U (zh) * 2012-04-18 2012-12-05 昆山康佳电子有限公司 导光板及背光模组
CN102818187A (zh) * 2012-07-31 2012-12-12 京东方科技集团股份有限公司 背光模组、显示装置及亮斑现象消减方法

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5613751A (en) * 1995-06-27 1997-03-25 Lumitex, Inc. Light emitting panel assemblies
TW594072B (en) * 1999-12-28 2004-06-21 Fujitsu Kasei Kk Lighting apparatus
TW556028B (en) * 2003-01-30 2003-10-01 Benq Corp Modular LED backlight assembly
US7168842B2 (en) * 2004-12-01 2007-01-30 Au Optronics Corporation Light emitting diode backlight package
TW200622403A (en) * 2004-12-31 2006-07-01 Innolux Display Corp Backlight module
US20060158901A1 (en) * 2005-01-19 2006-07-20 Chih-Yuan Wang Backlight module with combinative light source and device of changing color of illumination
KR100826401B1 (ko) * 2005-12-02 2008-05-02 삼성전기주식회사 Ｌｅｄ 백라이트 장치
CN2888479Y (zh) * 2005-12-15 2007-04-11 群康科技(深圳)有限公司 背光模组和液晶显示装置
KR100989219B1 (ko) * 2006-06-30 2010-10-20 엘지디스플레이 주식회사 백라이트 어셈블리 및 이를 구비한 액정표시장치.
JP4765837B2 (ja) * 2006-08-23 2011-09-07 ソニー株式会社 バックライト装置及び液晶表示装置
KR101283129B1 (ko) * 2007-04-03 2013-07-05 엘지이노텍 주식회사 도광판, 면 광원 장치 및 이를 갖는 표시 장치
CN100595649C (zh) * 2007-07-24 2010-03-24 北京京东方光电科技有限公司 Lcd背光源
CN201242066Y (zh) * 2008-07-30 2009-05-20 比亚迪股份有限公司 背光模组以及背光模组中的胶框
US8517588B2 (en) * 2008-09-30 2013-08-27 Rainier Horst Integrally illuminated panel apparatus and methods
DE202010001155U1 (de) * 2010-01-20 2010-04-22 Zumtobel Lighting Gmbh Lichtleiterplatte mit phosphorhaltigen Strukturelementen
CN101936486B (zh) * 2010-08-20 2014-06-18 友达光电股份有限公司 背光模块
TW201209480A (en) * 2010-08-25 2012-03-01 Young Lighting Technology Corp Light guide plate and light source module
CN201866625U (zh) * 2010-10-14 2011-06-15 北京京东方光电科技有限公司 光源模组、背光源及液晶显示器
TWM417571U (en) * 2011-06-29 2011-12-01 Coretronic Corp Backlight module
CN202165938U (zh) * 2011-07-14 2012-03-14 深圳市华星光电技术有限公司 一种背光模组及使用该背光模组的液晶显示装置
KR101291141B1 (ko) * 2011-08-25 2013-08-01 삼성전자주식회사 Ｃｏｂ 타입의 발광소자 모듈을 포함하는 백라이트 유닛
CN202521499U (zh) 2012-04-06 2012-11-07 北京京东方光电科技有限公司 导光板、背光源及液晶显示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102141647A (zh) * 2011-05-04 2011-08-03 中国科学院深圳先进技术研究院 导光板及含有该导光板的led灯具
US20120294033A1 (en) * 2011-05-18 2012-11-22 Kocam International Co., Ltd. Backlight Module with Three-Dimensional Circuit Structure and Extrusion Housing
EP2527889A1 (en) * 2011-05-25 2012-11-28 Kocam International Co.Ltd. Backlight module with three-dimensional circuit structure and extrusion Housing
CN202580939U (zh) * 2012-04-09 2012-12-05 苏州世鼎电子有限公司 具有v型切槽结构的led背光模组
CN202583503U (zh) * 2012-04-18 2012-12-05 昆山康佳电子有限公司 导光板及背光模组
CN102818187A (zh) * 2012-07-31 2012-12-12 京东方科技集团股份有限公司 背光模组、显示装置及亮斑现象消减方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115047556A (zh) * 2022-06-07 2022-09-13 安徽康佳电子有限公司 一种窄边侧入式液晶电视背光结构
CN115047556B (zh) * 2022-06-07 2024-04-09 安徽康佳电子有限公司 一种窄边侧入式液晶电视背光结构

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