WO2023184097A1 - 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
WO2023184097A1
WO2023184097A1 PCT/CN2022/083442 CN2022083442W WO2023184097A1 WO 2023184097 A1 WO2023184097 A1 WO 2023184097A1 CN 2022083442 W CN2022083442 W CN 2022083442W WO 2023184097 A1 WO2023184097 A1 WO 2023184097A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
backlight module
area
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PCT/CN2022/083442
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English (en)
French (fr)
Inventor
李海龙
刘玉东
王宁
Original Assignee
京东方科技集团股份有限公司
合肥鑫晟光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 合肥鑫晟光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to PCT/CN2022/083442 priority Critical patent/WO2023184097A1/zh
Priority to CN202280000565.2A priority patent/CN117321489A/zh
Publication of WO2023184097A1 publication Critical patent/WO2023184097A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices

Definitions

  • the present disclosure relates to the technical field of display, and in particular to a backlight module and a display device.
  • TFT-LCD Thin Film Transistor, Liquid Crystal Display, thin film transistor liquid crystal display
  • edge-type LED Light Emitting Diode, light-emitting diode
  • the narrow frame will limit the effective sticking area that the LED can use, causing the problem of weak LED sticking, which will affect the display effect of the entire TFT-LCD.
  • the present disclosure discloses a backlight module and a display device, which are used to ensure the display effect of a narrow-frame display device.
  • the present disclosure provides a backlight module, including:
  • the light guide plate has a light exit surface, a bottom surface opposite to the light exit surface, and a light entrance surface connecting the light exit surface and the bottom surface; the light exit surface is divided into a light exit area and a light exit area surrounding the light exit area. surrounding area;
  • the light strip has a light emitting direction facing the light incident surface
  • a circuit board is connected to the light bar and located on the bottom side of the light guide plate.
  • the overlapping portion of the circuit board and the light guide plate forms a connection area, and the front projection of the connection area on the light exit surface is completely Located in the peripheral area and at least partially located in the light emitting area.
  • the light guide plate provided by the present disclosure has a light exit surface, a bottom surface and a light entrance surface.
  • the light exit direction of the light bar is toward the light entrance surface.
  • the light emitted by the light bar enters from the light entrance surface of the light guide plate and then exits from the light exit surface.
  • the light is passed through the light guide plate.
  • the line light source of the strip is converted into a surface light source to make the light emitted from the light emitting surface more uniform.
  • the circuit board connected to the light strip is located on one side of the bottom surface of the light guide plate.
  • the overlapping portion of the circuit board and the light guide plate forms a connection area. Through the connection area, the The relative position of the light bar and the light guide plate is fixed.
  • connection area of the connection area between the light bar and the light guide plate is the peripheral area plus part of the light emitting area. area, thus making the connection area of the connection area larger, ensuring that the relative position of the light bar and the light guide plate is fixed, making the light emitted by the light bar into the light guide plate uniform, so that the light emitted from the light exit surface of the light guide plate is also uniform, improving the backlight
  • the working efficiency of the module, the overall structure of the backlight module does not add other pasting materials, and the overall structure of the backlight module is simple.
  • the orthographic projection of the connection area on the light-emitting surface completely coincides with the light-emitting area.
  • a reflective layer is formed on a surface of the circuit board facing the light guide plate.
  • connection structure is provided in the connection area, the connection structure is located between the reflective layer and the light guide plate, and the connection structure is multiplexed into a dot structure of the light guide plate.
  • the overlapping area of the connection structure and the light guide plate is larger than the display area of the light guide plate.
  • connection structure includes several dot-type microstructures, and the number of the dot-type microstructures per unit area gradually increases in a direction away from the light incident surface.
  • the projection shape of the dot-type microstructure on the light guide plate is circular.
  • the diameter of the dot-type microstructure gradually increases from a direction close to the light incident surface to a direction away from the light incident surface.
  • the material of the dot-type microstructure is fixing glue.
  • the refractive index of the dot-type microstructure is different from the refractive index of the light guide plate.
  • the backlight module further includes a back plate located on one side of the bottom surface of the light guide plate.
  • the front projection of the circuit board on the back plate is greater than or equal to the sum of the front projection of the light guide plate on the back plate and the front projection of the light bar on the back plate.
  • the backlight module further includes: a scattering plate and a prism structure arranged in sequence on one side of the light exit surface of the light guide plate.
  • the present disclosure provides a display device, including: the backlight module according to any one of the first aspects.
  • Figure 1 is a schematic structural diagram of an existing backlight module
  • Figure 2 is a schematic structural diagram of an existing backlight module after being interfered by the external environment
  • Figure 3 is a schematic diagram of the partitions of the light guide plate in a backlight module provided by an embodiment of the present disclosure
  • Figure 4 is a schematic structural diagram of a backlight module provided by an embodiment of the present disclosure.
  • Figure 5 is a schematic structural diagram of another backlight module provided by an embodiment of the present disclosure.
  • Figure 6 is a schematic structural diagram of yet another backlight module provided by an embodiment of the present disclosure.
  • Figure 7 is a schematic plan view of a connection structure provided by an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of a film layer of a backlight module provided by an embodiment of the present disclosure.
  • Icon D-Gap; 1-Light guide plate; 1'-Light guide plate; 11-Light exit surface; A-Light exit area; B-Peripheral area; 12-Bottom surface; 13-Light entrance surface; 2-Light bar; 2'- Light bar; 3-circuit board; 3'-circuit board; 31-reflective layer; 4-reflective plate; 5-connection structure; 51-dot microstructure; 6-back plate; 61-front frame; 7-scattering plate ;8-Prism structure;9-Connector;10-Printed circuit board.
  • edge-type LED Light Emitting Diode, light-emitting diode
  • the narrow frame will limit the effective sticking area that the LED can use, causing the problem of weak LED sticking, which will affect the display effect of the entire TFT-LCD.
  • Figure 1 is a schematic structural diagram of an existing backlight module.
  • the light bar 2' is electrically connected to the circuit board 3'.
  • the circuit board 3' supplies power to the light bar 2'.
  • the light bar 2' emits Light enters from the light entrance surface of the light guide plate 1' and then exits from the light exit surface.
  • the linear light source of the light bar 2' is converted into a surface light source through the light guide plate 1', making the light emitted from the light exit surface more uniform.
  • FIG. 2 is a schematic structural diagram of an existing backlight module after being interfered by the external environment.
  • a gap D appears between the light guide plate 1' and the light bar 2'. Due to the existence of the gap D, the display will become black and affect the entire TFT. -LCD display effect.
  • an embodiment of the present disclosure provides a backlight module, including:
  • the light guide plate 1 has a light exit surface 11, a bottom surface 12 opposite to the light exit surface 11, and a light entrance surface 13 connecting the light exit surface 11 and the bottom surface 12; the light exit surface 11 is divided into a light exit area A and a periphery surrounding the light exit area A. Area B;
  • Light strip 2 the light emitting direction is toward the light incident surface 13;
  • the circuit board 3 is connected to the light bar 2 and is located on the bottom surface 12 of the light guide plate 1.
  • the overlapping portion of the circuit board 3 and the light guide plate 1 forms a connection area.
  • the orthographic projection of the connection area on the light exit surface 11 is completely located in the peripheral area B and At least part of it is located in the light emission area A.
  • the light guide plate 1 provided by the present disclosure has a light exit surface 11, a bottom surface 12 and a light entrance surface 13.
  • the light exit direction of the light bar 2 is toward the light entrance surface 13.
  • the light emitted by the light bar 2 passes through the light entrance surface of the light guide plate 1.
  • Surface 13 enters and then emerges from the light exit surface 11.
  • the linear light source of the light bar 2 is converted into a surface light source through the light guide plate 1, making the light emitted from the light exit surface 11 more uniform.
  • the circuit board 3 connected to the light bar 2 is located on the light guide plate 1. On one side of the bottom surface 12, the overlapping portion of the circuit board 3 and the light guide plate 1 forms a connection area.
  • connection area Through the connection area, the relative positions of the light bar 2 and the light guide plate 1 are fixed.
  • the orthographic projection of the connection area on the light exit surface 11 is completely located in the peripheral area B.
  • the connection area of the connection area between the light bar 2 and the light guide plate 1 is the area of the peripheral area B plus part of the light-emitting area A, thus making the connection area of the connection area larger and ensuring that the light bar
  • the relative position of 2 and the light guide plate 1 is fixed, so that the light emitted from the light bar 2 into the light guide plate 1 is uniform, so that the light emitted from the light exit surface 11 of the light guide plate 1 is also uniform, which improves the working efficiency of the backlight module.
  • the overall structure of the backlight module No other pasting materials are added, and the overall structure of the backlight module is simple.
  • the circuit board 3 is selected as a flexible printed circuit board, and the flexible printed circuit board is directly bent to the back side of the back plate 6, that is, the The flexible printed circuit board is directly bent to the side of the back plate 6 away from the light guide plate 1 .
  • the backlight module includes a front frame 61.
  • the presence of the front frame 61 will partially block the light exit surface 11 of the light guide plate 1.
  • the portion of the light guide plate 1 blocked by the front frame 61 is the periphery.
  • area B the part of the light guide plate 1 that is not blocked by the front frame 61 is the light emitting area A.
  • the circuit board 3 is a flexible printed circuit board (FPC, Flexible Printed Circuit board).
  • FPC Flexible Printed Circuit board
  • the connection area By extending the flexible printed circuit board beyond the peripheral area B, the contact area between the flexible printed circuit board and the light guide plate 1 is the connection area. Since The flexible printed circuit board extends beyond the peripheral area B, thereby increasing the area of the connection area.
  • connection area between the light bar 2 and the light guide plate 1 is the area of the peripheral area B plus part of the light emitting area A, thus making the connection area
  • the connection area becomes larger, effectively solving the problem of separation between the light bar 2 and the light guide plate 1, ensuring that the relative positions of the light bar 2 and the light guide plate 1 are fixed, so that the light emitted from the light bar 2 into the light guide plate 1 is uniform, so that the light guide plate 1
  • the light emitted from the light-emitting surface 11 is also uniform, which improves the working efficiency of the backlight module. No other pasting materials are added to the overall structure of the backlight module, and the overall structure of the backlight module is simple.
  • a reflective layer 31 is formed on the side of the circuit board 3 facing the light guide plate 1, and a reflective plate 4 is provided at other positions in the light output area A of the light guide plate 1.
  • the circuit board 3 and the reflective plate 4 formed with the reflective layer 31 are at the same film layer height, and the reflective plate 4 and the circuit board 3 are in direct contact without gaps.
  • the specific working principle of the backlight module is explained as follows: the LED light bar 2 is placed on the side, and then the linear light source is converted into a surface light source through the light guide plate 1 to make the light more uniform.
  • the light passes through the scattering plate 7 and the heat sink plate.
  • the function is to enlarge the area of light diffusion and make the light more uniform and soft; after the light passes through the heat sink plate, the light also passes through the prism structure 8.
  • the function of the prism structure 8 is to concentrate the scattered light to a certain level.
  • Structure 8 allows part of the light that does not conform to the angle to be used again; the reason why prism structure 8 is added is because the light is dispersed in all directions, but whether you are using a mobile phone or a monitor, it is facing the screen, so as much as possible Dispersing the light in the direction facing the person can also increase the brightness of the screen.
  • the orthographic projection of the connection area on the light-emitting surface 11 completely coincides with the light-emitting area A. That is, the flexible printed circuit board is extended beyond the peripheral area B and completely coincides with the light-emitting area A.
  • the flexible printed circuit board The contact area between the printed circuit board and the light guide plate 1 is the connection area. Since the flexible printed circuit board extends beyond the peripheral area B and completely covers the light emitting area A, the area of the connection area is greatly increased, that is, the connection area realizes the light bar.
  • connection area between 2 and the light guide plate 1 is the area of the peripheral area B plus the light emitting area A, thus making the connection area of the connection area larger, effectively solving the problem of separation between the light bar 2 and the light guide plate 1, and ensuring that the light bar 2 and the light guide plate 1 are
  • the relative position of the light bar 2 is fixed, so that the light emitted from the light bar 2 into the light guide plate 1 is uniform, so that the light emitted from the light exit surface 11 of the light guide plate 1 is also uniform, which improves the working efficiency of the backlight module.
  • the overall structure of the backlight module does not add other adhesives. Materials and the overall structure of the backlight module are simple.
  • an entire reflective layer 31 is formed on the side of the circuit board 3 facing the light guide plate 1 .
  • the reflective layer 31 functions to reuse the light reflected back to the lower surface.
  • connection structure 5 is provided in the connection area.
  • the connection structure 5 is located between the reflective layer 31 and the light guide plate 1.
  • the connection structure 5 is reused as the dot structure of the light guide plate 1.
  • the overlapping area of the connection structure 5 and the light guide plate 1 is larger than the display area of the light guide plate 1 , that is, part of the connection structure 5 overlaps with the peripheral area B of the light guide plate 1 .
  • the circuit board 3 is connected to the printed circuit board 10 through the connector 9, and the light bar 2 is controlled through the printed circuit board 10.
  • the side of the circuit board 3 facing the light guide plate 1 can not only form the reflective layer 31, but also form the control layer of other components, such as touch control.
  • the connection structure 5 includes several dot-type microstructures 51 , and the number of the dot-type microstructures 51 per unit area gradually increases in the direction away from the light incident surface 13 .
  • the diameter of the dot-type microstructure 51 gradually increases from the direction close to the light incident surface 13 to the direction away from the light incident surface 13 . That is to say, the dot-type microstructures 51 on the side close to the light bar 2 have a small area and sparse density, while the dot-type microstructures 51 on the side away from the light bar 2 have a large area and a dense density.
  • the projection shape of the dot-type microstructure 51 on the light guide plate 1 is circular.
  • the specific shape of the dot-type microstructure 51 is not specifically limited, as long as it can form a uniform surface light source on the light guide plate 1 .
  • the dot-type microstructures 51 are arranged as irregularly as possible and set at intervals, because when the light is reflected and refracted by the regularly arranged dots to the light exit surface 11 of the light guide plate 1, it cannot form Uniform surface light sources can easily cause visible dots on the display panel.
  • the material of the above-mentioned dot-type microstructure 51 is fixing glue.
  • the use of fixing glue as the dot-type microstructure 51 not only has the effect of bonding the light guide plate 1 and the circuit board 3, but also can form a uniform surface on the light guide plate 1. light source.
  • the refractive index of the dot-type microstructure 51 is different from that of the light guide plate 1 .
  • the backlight module also includes a back plate 6 located on one side of the bottom surface 12 of the light guide plate 1.
  • the back plate 6 mainly plays a supporting role.
  • the orthographic projection of the circuit board 3 on the back panel 6 is greater than or equal to the sum of the orthographic projection of the light guide plate 1 on the back panel 6 and the orthographic projection of the light bar 2 on the back panel 6 .
  • the area of the connection area is increased, that is, the connection area between the light bar 2 and the light guide plate 1 is the entire peripheral area B plus all the light emitting areas.
  • connection area of the connection area larger, ensuring that the relative position of the light bar 2 and the light guide plate 1 is fixed, so that the light emitted by the light bar 2 into the light guide plate 1 is uniform, so that the light exit surface 11 of the light guide plate 1 emits
  • the light is also uniform, which improves the working efficiency of the backlight module, and the overall structure of the backlight module is simple.
  • the backlight module further includes: a scattering plate 7 and a prism structure 8 arranged in sequence on one side of the light exit surface 11 of the light guide plate 1 .
  • the function of the heat dissipation plate is to enlarge the area of light diffusion and at the same time make the light more uniform and softer;
  • the function of the prism structure 8 is to concentrate the scattered light to a certain angle. Only the light that meets a certain angle will pass through the prism structure 8 When emitted, the light that does not meet the angle will be reflected back to the reflective layer 31 or the reflective plate 4 below, and then emit from the reflective layer 31 or the reflective plate 4 to the prism structure 8, so that part of the light that does not meet the angle can be used again;
  • the reason why the prism structure 8 is added is because the light is dispersed in all directions, but whether you are using a mobile phone or a monitor, you are facing the screen, so try to disperse the light in the direction facing the person as much as possible, which can also improve The brightness of the screen.
  • embodiments of the present application also provide a display device, including the above-mentioned backlight module provided by embodiments of the present application.
  • the display device can be: a handset, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, or any other product or component with a display function.
  • Other essential components of the display device are understood by those of ordinary skill in the art, and will not be described in detail here, nor should they be used to limit the present application.

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  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
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Abstract

一种背光模组及显示装置，该背光模组包括导光板(1)，出光面(11)划分为出光区(A)和包围出光区(A)的周边区(B)；灯条(2)，出光方向朝向入光面(13)；电路板(3)，与灯条(2)连接且位于导光板(1)的底面(12)一侧，电路板(3)与导光板(1)的交叠部分形成连接区，连接区在出光面(11)的正投影完全位于周边区(B)且至少部分位于出光区(A)内。通过导光板(1)将灯条(2)的线光源转换成为面光源，与灯条(2)连接电路板(3)位于导光板(1)的底面(12)的一侧，电路板(3)与导光板(1)交叠部分形成连接区，通过连接区实现灯条(2)与导光板(1)相对位置的固定，连接区在出光面(11)的正投影完全位于周边区(B)并且还有部分位于出光区(A)，连接区的连接面积变大，提高了背光模组的工作效率。

Description

一种背光模组及显示装置 技术领域
本公开涉及显示的技术领域，特别涉及一种背光模组及显示装置。
背景技术
TFT-LCD(Thin Film Transistor，Liquid Crystal Display，薄膜晶体管液晶显示器)具有体积小、功耗低、无辐射等特点，在当前的平板显示器市场占据了主导地位。随着TFT-LCD轻薄型化和窄边框发展的要求，侧入式LED(Light Emitting Diode，发光二极管)背光源技术得到了迅速发展；在边框变窄、尺寸变大的发展趋势中，在传统的背光中由于窄边框会导致LED可以利用的有效粘贴面积受限，使得LED粘贴不牢的问题出现，进而影响整个TFT-LCD的显示效果。
发明内容
本公开公开了一种背光模组及显示装置，用于保证窄边框显示装置的显示效果。
为达到上述目的，本公开提供以下技术方案：
第一方面，本公开提供的一种背光模组，包括：
导光板，所述导光板具有出光面、与所述出光面相对设置的底面以及连接所述出光面和所述底面的入光面；所述出光面划分为出光区和包围所述出光区的周边区；
灯条，出光方向朝向所述入光面；
电路板，与所述灯条连接且位于所述导光板的底面一侧，所述电路板与所述导光板的交叠部分形成连接区，所述连接区在所述出光面的正投影完全位于所述周边区且至少部分位于所述出光区内。
本公开提供的导光板具有出光面、底面和入光面，灯条的出光方向朝向 入光面，灯条发出的光从导光板的入光面进入然后从出光面射出，通过导光板将灯条的线光源转换成为面光源，让从出光面出射的光更均匀，与灯条连接电路板位于导光板的底面的一侧，电路板与导光板交叠部分形成连接区，通过连接区实现灯条与导光板相对位置的固定，连接区在出光面的正投影完全位于周边区并且还有部分位于出光区，也就是连接区实现灯条与导光板连接面积为周边区加上部分出光区的面积，从而使得连接区的连接面积变大，保证了灯条与导光板的相对位置固定，使得灯条射入导光板的光线均匀，从而导光板的出光面出射光线也均匀，提高了背光模组的工作效率，背光模组整体结构并不增加其他粘贴材料，背光模组整体结构简单。
可选地，所述连接区在所述出光面的正投影与所述出光区完全重合。
可选地，所述电路板朝向所述导光板一侧的表面形成有反射层。
可选地，在所述连接区设置有连接结构，所述连接结构位于所述反射层和所述导光板之间，所述连接结构复用为所述导光板的网点结构。
可选地，所述连接结构与所述导光板的交叠面积大于所述导光板的显示区。
可选地，所述连接结构包括若干个网点型微结构，所述网点型微结构在远离所述入光面的方向上单位面积内的数量逐渐增多。
可选地，所述网点型微结构在所述导光板上的投影形状为圆形。
可选地，自靠近所述入光面至远离所述入光面的方向所述网点型微结构的直径逐渐变大。
可选地，所述网点型微结构的材料为固定胶。
可选地，所述网点型微结构的折射率与所述导光板的折射率不同。
可选地，所述背光模组还包括位于所述导光板底面一侧的背板。
可选地，所述电路板在所述背板上的正投影大于等于所述导光板在所述背板上的正投影和所述灯条在所述背板上的正投影之和。
可选地，所述背光模组还包括：依次设置在所述导光板出光面一侧的散射板和棱镜结构。
第二方面，本公开提供的一种显示装置，包括：第一方面任一项所述的背光模组。
附图说明
图1为现有的背光模组的结构示意图；
图2为现有的背光模组受到外界环境干扰后的结构示意图；
图3为本公开实施例提供的一种背光模组中导光板的分区示意图；
图4为本公开实施例提供的一种背光模组结构示意图；
图5为本公开实施例提供的另一种背光模组结构示意图；
图6为本公开实施例提供的再一种背光模组结构示意图；
图7为本公开实施例提供的连接结构的平面示意图；
图8为本公开实施例提供的一种背光模组的膜层示意图。
图标：D-间隙；1-导光板；1’-导光板；11-出光面；A-出光区；B-周边区；12-底面；13-入光面；2-灯条；2’-灯条；3-电路板；3’-电路板；31-反射层；4-反射板；5-连接结构；51-网点型微结构；6-背板；61-前框；7-散射板；8-棱镜结构；9-连接器；10-印刷电路板。
具体实施方式
下面将结合本公开实施例中的附图，对本公开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公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
随着TFT-LCD轻薄型化和窄边框发展的要求，侧入式LED(Light Emitting Diode，发光二极管)背光源技术得到了迅速发展；在边框变窄、尺寸变大的发展趋势中，在传统的背光中由于窄边框会导致LED可以利用的有效粘贴面积受限，使得LED粘贴不牢的问题出现，进而影响整个TFT-LCD的显示效果。
图1为现有的背光模组的结构示意图，在图1中，灯条2’与电路板3’电连接，通过电路板3’实现对灯条2’的供电，灯条2’发出的光从导光板1’的入光面进入然后从出光面射出，通过导光板1’将灯条2’的线光源转换成为面光源，让从出光面出射的光更均匀,为了保证灯条2’进入导光板1’的光线量，因此需要保证灯条2’与导光板1’之间的距离，也就是需要将与灯条2’电连接的电路板3’和导光板1’进行固定，但是当灯条2’持续工作时，将会导致局部温度过高，使得导光板1’与电路板3’之间的连接不稳固，从而造成两者之间部分地方无法连接，从而出现图2为现有的背光模组受到外界环境干扰后的结构示意图，在图2中导光板1’和灯条2’之间出现间隙D，由于间隙D的存在将会显示发黑，影响整个TFT-LCD的显示效果。
如图3所示，本公开实施例提供了一种背光模组，包括：
导光板1，导光板1具有出光面11、与出光面11相对设置的底面12以及连接出光面11和底面12的入光面13；出光面11划分为出光区A和包围出光区A的周边区B；
灯条2，出光方向朝向入光面13；
电路板3，与灯条2连接且位于导光板1的底面12一侧，电路板3与导光板1的交叠部分形成连接区，连接区在出光面11的正投影完全位于周边区B且至少部分位于出光区A内。
需要说明的是，本公开提供的导光板1具有出光面11、底面12和入光面13，灯条2的出光方向朝向入光面13，灯条2发出的光从导光板1的入光面13进入然后从出光面11射出，通过导光板1将灯条2的线光源转换成为面光源，让从出光面11出射的光更均匀，与灯条2连接电路板3位于导光板1的底面12的一侧，电路板3与导光板1交叠部分形成连接区，通过连接区实现灯条2与导光板1相对位置的固定，连接区在出光面11的正投影完全位于周边区B并且还有部分位于出光区A，也就是连接区实现灯条2与导光板1连接面积为周边区B加上部分出光区A的面积，从而使得连接区的连接面积变大，保证了灯条2与导光板1的相对位置固定，使得灯条2射入导光板1的 光线均匀，从而导光板1的出光面11出射光线也均匀，提高了背光模组的工作效率，背光模组整体结构并不增加其他粘贴材料，背光模组整体结构简单。
当然在边框变窄、尺寸变大的发展趋势中，为了将边框变窄，将电路板3选择为柔性印刷电路板，将柔性印刷电路板直接弯折至背板6的后侧，也就是将柔性印刷电路板直接弯折至背板6远离导光板1的一侧。
继续参考图3，在图3中背光模组包括前框61，由于前框61的存在将会对导光板1的出光面11造成部分遮挡，导光板1中被前框61遮挡的部分是周边区B，导光板1中未被前框61遮挡的部分是出光区A。
具体的，电路板3为柔性印刷电路板(FPC，Flexible Printed Circuit board)通过将柔性印刷电路板延伸至超出周边区B，柔性印刷电路板与导光板1之间接触的区域为连接区，由于柔性印刷电路板延伸至超出周边区B，从而使得连接区的面积增加，也就是连接区实现灯条2与导光板1连接面积为周边区B加上部分出光区A的面积，从而使得连接区的连接面积变大，有效解决灯条2与导光板1分离问题，保证了灯条2与导光板1的相对位置固定，使得灯条2射入导光板1的光线均匀，从而导光板1的出光面11出射光线也均匀，提高了背光模组的工作效率，背光模组整体结构并不增加其他粘贴材料，背光模组整体结构简单。
在图4中，为了提高灯条2的光线的利用率，在电路板3朝向导光板1的一侧形成有反射层31，而在导光板1出光区A的其他位置设置有反射板4，为了保证导光板1的出光面11平行于背板6，因此形成有反射层31的电路板3和反射板4为同一膜层高度，并且反射板4与电路板3之间无间隙直接接触。
为方便理解对背光模组的具体工作原理进行如下说明：LED灯条2放置在侧面，然后通过导光板1将线光源转换成为面光源，让光更均匀，光穿过散射板7，散热板的作用是让光扩散的面积变大，同时也让光更均匀柔和；光穿过散热板之后，光还要穿过棱镜结构8，棱镜结构8的作用就是可以把分散的光线给集中到一定角度，只有符合一定角度的光线才会从棱镜结构8射出，不符合角度的光线就会被反射回下面的反射层31或是反射板4，再从反射层 31或是反射板4射向棱镜结构8，让一部分不符合角度的光线再次被利用；之所以要增加棱镜结构8，是因为光线是朝各个方向分散的，但不管使用手机还是显示器，都是正对着屏幕的，所以尽可能的让光线向正对人的方向分散，这样也可以提高屏幕的亮度。
为了简化制备工艺，如图5所示，连接区在出光面11的正投影与出光区A完全重合，也就是，将柔性印刷电路板延伸至超出周边区B并与出光区A完全重合，柔性印刷电路板与导光板1之间接触的区域为连接区，由于柔性印刷电路板延伸至超出周边区B并完全覆盖出光区A，从而使得连接区的面积大大增加，也就是连接区实现灯条2与导光板1连接面积为周边区B加上出光区A的面积，从而使得连接区的连接面积变大，有效解决灯条2与导光板1分离问题，保证了灯条2与导光板1的相对位置固定，使得灯条2射入导光板1的光线均匀，从而导光板1的出光面11出射光线也均匀，提高了背光模组的工作效率，背光模组整体结构并不增加其他粘贴材料，背光模组整体结构简单。
在图5中，为了提高灯条2的光线的利用率，在电路板3朝向导光板1的一侧形成有整层反射层31，反射层31起到将被反射回下面光线再次被利用。
如图6所示，为了增加电路板3与导光板1的连接性能，在连接区设置有连接结构5，连接结构5位于反射层31和导光板1之间，但是如果引入新的连接结构5，将会对光线的光学性能造成一定影响，可能会影响整个TFT-LCD的显示效果，因此连接结构5复用为导光板1的网点结构。
具体的，连接结构5与导光板1的交叠面积大于导光板1的显示区，也就是连接结构5还有部分与导光板1的周边区B存在交叠。
继续参考图4-图6，电路板3通过连接器9与印刷电路板10连接，通过印刷电路板10实现对灯条2的控制。当然电路板3朝向导光板1的一侧不但可以形成反射层31，还可以形成其他元器件的控制层，例如触控等。
如图7所示，连接结构5包括若干个网点型微结构51，网点型微结构51在远离入光面13的方向上单位面积内的数量逐渐增多。自靠近所述入光面13 至远离所述入光面13的方向所述网点型微结构51的直径逐渐变大。也就是在靠近灯条2的一侧网点型微结构51面积小且密度稀疏，而远离灯条2的一侧网点型微结构51面积大且密度密集。
例如，网点型微结构51在所述导光板1上的投影形状为圆形。当然关于网点型微结构51的具体形状并不做具体限定，只要是能够在导光板1上形成均匀的面光源即可。
为了在导光板1形成均匀的面光源，网点型微结构51排布尽可能的不规律，并且间隔设置，因为光线经过规则排列的网点反射、折射至导光板1的出光面11时，不能形成均匀的面光源，容易在显示面板上出现网点可视现象。
上述网点型微结构51的材料为固定胶，采用固定胶作为网点型微结构51，既起到了将导光板1与电路板3粘接的效果，同时还能够在导光板1上形成均匀的面光源。
为了保证灯条2的出射光线的反射和扩散后从导光板1的出光面11射出，网点型微结构51的折射率与导光板1的折射率不同。
在一些具体的实施方式中，背光模组还包括位于导光板1底面12一侧的背板6，背板6主要起到支撑的作用。
可选地，电路板3在背板6上的正投影大于等于导光板1在背板6上的正投影和灯条2在背板6上的正投影之和。通过增加电路板3与导光板1和灯条2的接触面积，也就是增加了连接区的面积，也就是连接区实现灯条2与导光板1连接面积为全部周边区B加上全部出光区A的面积，从而使得连接区的连接面积变大，保证了灯条2与导光板1的相对位置固定，使得灯条2射入导光板1的光线均匀，从而导光板1的出光面11出射光线也均匀，提高了背光模组的工作效率，背光模组整体结构简单。
如图8所示，在一些具体的实施方式中，背光模组还包括：依次设置在所述导光板1出光面11一侧的散射板7和棱镜结构8。
散热板的作用是让光扩散的面积变大，同时也让光更均匀柔和；棱镜结构8的作用就是可以把分散的光线给集中到一定角度，只有符合一定角度的 光线才会从棱镜结构8射出，不符合角度的光线就会被反射回下面的反射层31或是反射板4，再从反射层31或是反射板4射向棱镜结构8，让一部分不符合角度的光线再次被利用；之所以要增加棱镜结构8，是因为光线是朝各个方向分散的，但不管使用手机还是显示器，都是正对着屏幕的，所以尽可能的让光线向正对人的方向分散，这样也可以提高屏幕的亮度。
基于同一公开构思，本申请实施例还提供了一种显示装置，包括本申请实施例提供的上述背光模组。该显示装置可以为：子机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。对于该显示装置的其它必不可少的组成部分均为本领域的普通技术人员应该理解具有的，在此不做赘述，也不应作为对本申请的限制。该显示装置的实施可以参见上述背光模组的实施例，重复之处不再赘述。
显然，本领域的技术人员可以对本公开实施例进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (14)

  1. 一种背光模组，其中，包括：
    导光板，所述导光板具有出光面、与所述出光面相对设置的底面以及连接所述出光面和所述底面的入光面；所述出光面划分为出光区和包围所述出光区的周边区；
    灯条，出光方向朝向所述入光面；
    电路板，与所述灯条连接且位于所述导光板的底面一侧，所述电路板与所述导光板的交叠部分形成连接区，所述连接区在所述出光面的正投影完全位于所述周边区且至少部分位于所述出光区内。
  2. 根据权利要求1所述的背光模组，其中，所述连接区在所述出光面的正投影与所述出光区完全重合。
  3. 根据权利要求2所述的背光模组，其中，所述电路板朝向所述导光板一侧的表面形成有反射层。
  4. 根据权利要求3所述的背光模组，其中，在所述连接区设置有连接结构，所述连接结构位于所述反射层和所述导光板之间，所述连接结构复用为所述导光板的网点结构。
  5. 根据权利要求4所述的背光模组，其中，所述连接结构与所述导光板的交叠面积大于所述导光板的显示区。
  6. 根据权利要求4所述的背光模组，其中，所述连接结构包括若干个网点型微结构，所述网点型微结构在远离所述入光面的方向上单位面积内的数量逐渐增多。
  7. 根据权利要求6所述的背光模组，其中，所述网点型微结构在所述导光板上的投影形状为圆形。
  8. 根据权利要求7所述的背光模组，其中，自靠近所述入光面至远离所述入光面的方向所述网点型微结构的直径逐渐变大。
  9. 根据权利要求6所述的背光模组，其中，所述网点型微结构的材料为 固定胶。
  10. 根据权利要求9所述的背光模组，其中，所述网点型微结构的折射率与所述导光板的折射率不同。
  11. 根据权利要求1-10任一项所述的背光模组，其中，所述背光模组还包括位于所述导光板底面一侧的背板。
  12. 根据权利要求11所述的背光模组，其中，所述电路板在所述背板上的正投影大于等于所述导光板在所述背板上的正投影和所述灯条在所述背板上的正投影之和。
  13. 根据权利要求1-10任一项所述的背光模组，其中，所述背光模组还包括：依次设置在所述导光板出光面一侧的散射板和棱镜结构。
  14. 一种显示装置，其中，包括：权利要求1-13任一项所述的背光模组。
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