WO2012145945A1 - 导光板及其背光模组 - Google Patents

导光板及其背光模组 Download PDF

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Publication number
WO2012145945A1
WO2012145945A1 PCT/CN2011/074308 CN2011074308W WO2012145945A1 WO 2012145945 A1 WO2012145945 A1 WO 2012145945A1 CN 2011074308 W CN2011074308 W CN 2011074308W WO 2012145945 A1 WO2012145945 A1 WO 2012145945A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
light
microstructure
microstructures
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/CN2011/074308
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English (en)
French (fr)
Inventor
张光耀
胡哲彰
张静
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.)
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Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/143,438 priority Critical patent/US8506153B2/en
Publication of WO2012145945A1 publication Critical patent/WO2012145945A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • 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

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a light guide plate and a backlight module thereof.
  • light-emitting diodes are often used for small and thin LCD backlight modules.
  • Diode, LED side lighting
  • the light guide Light Guide Panel, LGP
  • the microstructure can scatter, reflect, and finally exit from the surface of the light guide plate to achieve uniform brightness of the entire surface of the light guide plate.
  • FIG. 1 is a schematic plan view of a conventional backlight module.
  • the backlight module includes a light guide plate 1 and an LED light bar 4.
  • the light guide plate 1 includes a light incident surface 2 corresponding to the LED light strip 4, a bottom surface 5, a light exit surface (not labeled) opposite to the bottom surface 5, and two side surfaces (not labeled) perpendicular to the light incident surface 2.
  • the x direction is a direction parallel to the light incident surface 2 of the light guide plate 1;
  • the y direction is a direction parallel to both side surfaces of the light guide plate 1.
  • the bottom surface 5 of the light guide plate 1 is provided with a plurality of microstructures 3 parallel to the x direction.
  • the light-emitting condition of the light guide plate 1 described above is to concentrate the light to the middle portion of the light guide plate 1 to conform to human vision. It is experimentally determined that the light-emitting condition of the light guide plate 1 in the y direction is high in the middle brightness, and the edge brightness is low, and the light in the x direction does not concentrate well to the center, thereby causing loss of light energy, thereby reducing light. Utilization rate.
  • a light guide plate includes a light incident surface, a bottom surface and a light emitting surface opposite to the bottom surface, and the bottom surface and/or the light emitting surface is provided with a plurality of microstructures, and the microstructure comprises a plurality of first micro a structure and a plurality of second microstructures; the bottom surface and/or the light exit surface of the light guide plate are divided into three parts of a left side, a middle side, and a right side in a direction parallel to the light incident surface, and the first microstructure is distributed on the left side a portion and an intermediate portion, the second microstructure is distributed in the middle portion and the right portion, and the distribution rule of the microstructure along the direction parallel to the light incident surface is: the middle microstructure of the light guide plate is closely arranged, and the microstructures on both sides are arranged Sparse.
  • the plurality of the first microstructures are arranged in parallel with each other; and the plurality of the second microstructures are arranged in parallel with each other.
  • the first microstructure and the second microstructure are both parallel to the light incident surface of the light guide plate.
  • the first microstructure and the second microstructure have an included angle at an intermediate portion.
  • the light guide plate further comprises two sides perpendicular to the light incident surface, and the farther the microstructure is from the light surface, the closer the distribution is in the direction parallel to the side surface of the light guide plate.
  • the microstructure is a groove formed on a bottom surface of the light guide plate, and has a cross section at least one of a semicircular shape, a diamond shape or a semi-elliptical shape.
  • the opening of the groove is rectangular.
  • each of the microstructures has the same length.
  • the invention also provides a light guide plate comprising a light incident surface, a bottom surface and a light exit surface opposite to the bottom surface, the bottom surface and/or the light exit surface being provided with a plurality of microstructures, the microstructures being parallel
  • the distribution rule in the direction of the entrance surface is: the middle microstructure of the light guide plate is closely arranged, and the microstructures on both sides are sparsely arranged.
  • the light guide plate further includes two sides perpendicular to the light incident surface, the bottom surface is divided into a plurality of columns in a direction parallel to the light incident surface, each column includes a plurality of microstructures, and is adjacent to the plurality of sides of the light guide plate.
  • the spacing of the microstructures is large, and the spacing of the plurality of microstructures near the middle of the bottom surface is small.
  • the microstructure is a groove formed on a bottom surface of the light guide plate, the opening of the groove is rectangular, the length is the same, and the long side is parallel to the light incident surface of the light guide plate.
  • the light guide plate further comprises two sides perpendicular to the light incident surface, and the bottom surface of the light guide plate is divided into several rows in a direction parallel to the side surface, each row includes a plurality of microstructures, and the long sides of the microstructure are parallel to the light guide plate
  • the side surface, the regularity of the microstructure of each row in the direction of the light incident surface is: the spacing between the plurality of microstructures near the middle of the row is small, and the spacing between the plurality of microstructures near the two sides of the light guide plate Larger.
  • the further the microstructure is away from the light surface the closer the distribution is in the direction parallel to the side of the light guide plate.
  • the invention also provides a backlight module comprising a light source and a light guide plate, wherein the light guide plate is a light guide plate as described above.
  • the light guide plate and the backlight module thereof provided by the invention have a plurality of microstructures disposed on the light exit surface and/or the bottom surface of the light guide plate, and the distribution rule of the microstructure along the light incident surface parallel to the light guide plate is: the light guide plate
  • the intermediate microstructures are closely arranged, and the microstructures on both sides are sparsely arranged.
  • the above microstructures can make the light guide plate have a center-high and low-edge brightness distribution in the direction parallel to the light-incident surface, thereby improving the utilization of light energy.
  • FIG. 1 is a schematic plan view of a conventional backlight module.
  • FIG. 2 is a schematic plan view showing the first embodiment of the backlight module of the present invention.
  • FIG. 3 is an enlarged cross-sectional view of the light guide plate of the backlight module shown in FIG. 2 taken along the line A-A.
  • FIG. 4 is a schematic plan view showing a second embodiment of a backlight module of the present invention.
  • FIG. 5 is an enlarged cross-sectional view of the light guide plate of the backlight module shown in FIG. 4 taken along line B-B.
  • FIG. 5 is an enlarged cross-sectional view of the light guide plate of the backlight module shown in FIG. 4 taken along line B-B.
  • FIG. 6 is a schematic plan view showing a third embodiment of a backlight module of the present invention.
  • FIG. 7 is a schematic plan view showing a fourth embodiment of a backlight module of the present invention.
  • FIG. 8 is a schematic plan view showing a fifth embodiment of a backlight module of the present invention.
  • FIG. 9 is a schematic plan view showing a sixth embodiment of a backlight module of the present invention.
  • FIG. 2 is a schematic plan view showing the first embodiment of the backlight module of the present invention.
  • the backlight module includes a light source (not labeled) and a light guide plate 11.
  • the light source is an LED light bar, and includes a PCB board 13 and a plurality of LEDs 12 disposed on the PCB board 13.
  • the light guide plate 11 includes a light incident surface 111 corresponding to the LED light bar, a bottom surface 112, a light emitting surface (not shown) opposite to the bottom surface 112, and two side surfaces 113 and 114 perpendicular to the light incident surface 111.
  • the bottom surface 112 is divided into three rows 101, 102, and 103 which are substantially equal to each other in the x direction parallel to the light incident surface 11 in the left, middle, and right directions.
  • Each column includes a plurality of microstructures 10.
  • the microstructures 10 are aligned in the y-direction parallel to the sides 113, 114.
  • the microstructures 10 located in the left column 101 and the right column 103 have a large pitch, and the microstructures 10 located in the middle column 102 have a small pitch.
  • the bottom surface 112 of the light guide plate 11 includes three left, middle, and right columns 101, 102, 103 microstructures 10 that are substantially equal and aligned.
  • the microstructures 10 are on the bottom surface 112 of the light guide plate 11.
  • the distribution may also be three or more columns, such as four columns, five columns, etc., wherein the distribution rule of the microstructures 10 is still: the spacing of the plurality of microstructures 10 in the columns adjacent to the two sides 113, 114 of the light guide plate 10 is relatively large.
  • the pitch of the plurality of microstructures 10 near the column in the middle of the light guide plate 10 is small.
  • the lengths of the microstructures 10 of the columns may not be equal.
  • FIG. 3 is an enlarged cross-sectional view of the light guide plate of the backlight module shown in FIG. 2 taken along the line A-A.
  • the microstructure 10 is a groove formed on the bottom surface 112 of the light guide plate 11.
  • the cross section (not shown) is semicircular. In other embodiments, the cross section of the microstructure 10 may also be a diamond. Or semi-elliptical and so on.
  • the opening 100 of the groove is rectangular, the length is the same, and the long side is parallel to the x direction.
  • the microstructures 10 of the left column 101 and the right column 103 of the bottom surface 112 of the light guide plate 11 of the present embodiment have a large pitch, and the microstructures 10 of the middle column 102 have a small pitch, so the microstructure 10 is incident on the light.
  • the parallel arrangement of the faces 11 in the x direction is such that the microstructures 10 located in the middle of the light guide plate 11 are closely arranged, and the microstructures 10 on both sides of the light guide plate 11 are arranged sparsely, so that the structure distribution can concentrate the light in the x direction to the light guide plate 11 In the middle region, the light output of the light guide plate 11 in the x direction reaches a center height and a low edge brightness distribution, thereby improving the utilization of light energy.
  • FIG. 4 is a schematic plan view showing a second embodiment of the backlight module of the present invention.
  • the bottom surface 212 of the light guide plate 21 is divided into substantially equal upper, middle, and lower rows 201, 202, and 203 along the y direction parallel to the side surfaces 213 and 214.
  • Each row includes a plurality of microstructures 20.
  • the microstructures 20 are aligned in the x direction parallel to the light incident surface 211.
  • the respective rules of the microstructures 21 of each row in the x direction are: the spacing between the plurality of microstructures 20 located in the middle of the row is small, and the plurality of microstructures 21 adjacent to the two sides 213, 214 of the light guide plate 21 are 21 The spacing between them is large.
  • the above structure is such that the distribution of the microstructures 20 in the x direction parallel to the light incident surface 211 is such that the microstructures 20 located in the middle of the light guide plate 21 are closely arranged, and the microstructures 20 located on both sides of the light guide plate 21 are sparsely arranged.
  • the bottom surface 212 of the light guide plate 21 includes substantially equal upper, middle and lower rows 201, 202, 203 microstructures 20 in the y direction parallel to the side surfaces 213, 214.
  • the light guide plate 21 is The bottom surface 212 may further include two or more rows of substantially equal or unequal rows of microstructures 20 in the y-direction parallel to the sides 213, 214, respectively, and the respective rules of the plurality of microstructures 20 in each row in the x-direction Therefore, the spacing between the plurality of microstructures 20 near the middle of the row is small, and the spacing between the plurality of microstructures 21 adjacent to the two sides 213, 214 of the light guide plate 21 is large.
  • FIG. 5 is an enlarged cross-sectional view of the light guide plate of the backlight module shown in FIG. 4 taken along the line A-A.
  • the microstructure 20 is a groove formed on the bottom surface 212 of the light guide plate 21, and its cross section (not shown) is semicircular.
  • the cross section of the microstructure 20 can also be diamond or semi-elliptical or the like.
  • the openings (not labeled) of the grooves are rectangular in shape, the length is the same, and the long sides are parallel to the y direction.
  • FIG. 6 is a schematic plan view showing a third embodiment of the backlight module of the present invention, which is similar to the first embodiment, except that the length of each microstructure 30 of the light guide plate 31 in this embodiment is different.
  • the bottom surface 312 is divided into left, middle, and right columns 301, 302, and 303 which are not aligned along the x direction parallel to the light incident surface 311.
  • Each column includes a plurality of microstructures 30, and each column of microstructures 30 is misaligned in the y-direction parallel to sides 313, 314.
  • the microstructures 30 located in the left column 301 and the right column 303 have a larger pitch, and the microstructures 30 located in the middle column 302 have a smaller pitch.
  • each microstructure 30 may also be different.
  • the bottom surface 312 of the light guide plate 31 is divided into left, middle, and right columns 301, 302, and 303 which are not aligned in the x direction parallel to the light incident surface 311.
  • the bottom surface 312 of the light guide plate 31 is 312.
  • the x direction parallel to the light incident surface 311 can also be divided into three or more columns that are not aligned, such as four columns, five columns, etc., each column includes a plurality of microstructures 30, and the long sides of each microstructure 30 are parallel to the x direction.
  • the distribution rule of the three or more microstructures 30 on the bottom surface 312 of the light guide plate 31 is still: the plurality of microstructures 30 adjacent to the columns of the two side surfaces 313, 314 of the light guide plate 31 are spaced apart from each other, and are close to the middle of the light guide plate 31.
  • the microstructures of the columns have a small pitch of 30.
  • FIG. 7 is a schematic plan view showing a fourth embodiment of the backlight module of the present invention.
  • the microstructure 40 of the bottom surface 412 of the light guide plate 41 in the embodiment includes a plurality of first microstructures 401 parallel to each other and a plurality of second microstructures 402 parallel to each other, that is, the plurality of first microstructures 401 are arranged in parallel with each other;
  • the strip second microstructures 402 are arranged in parallel with one another.
  • the bottom surface 412 of the light guide plate 41 is divided into three portions of a substantially equal left side 4121, a middle 4122, and a right side 4123 in the x direction.
  • the first microstructure 401 is distributed on the left side portion 4121 and the middle portion 4122, and the second microstructure is 402 is distributed between the intermediate portion 4122 and the right portion 4123.
  • the first microstructure 401 and the second microstructure 402 intersect at an intermediate portion 4122 of the bottom surface 412 of the light guide plate 41 at an angle, so that the arrangement of the microstructures 40 in the middle of the light guide plate 41 is closer than the arrangement of the two side microstructures 40.
  • FIG. 8 is a schematic plan view showing the fifth embodiment of the backlight module of the present invention.
  • the microstructures 50 of the light guide plate 51 are disorderly arranged in a staggered manner, but the distribution of the microstructures 50 in the x direction is such that the intermediate microstructures 50 of the light guide plate 51 are closely arranged, and the sides of the light guide plate 51 are slightly
  • the structure 50 is sparsely arranged.
  • FIG. 9 is a plan view showing a planar structure of a sixth embodiment of the backlight module of the present invention, which is similar to the first embodiment except that it is parallel to the side (not labeled) of the light guide plate 61.
  • the farther the microstructure 60 is from the light surface 611 the closer the distribution is.
  • the farther away from the light surface 611 the less light is transmitted, and the uniform distribution of light distribution is achieved by increasing the density of the microstructures 60.
  • the distribution density of the microstructure of the light guide plate in the y direction parallel to the side surface of the light guide plate may be set such that the farther the microstructure 60 is from the light surface 611 The closer the distribution, the better the utilization of light energy.
  • the first microstructure 401 and the second microstructure 402 of the light guide plate 41 of the fourth embodiment described above may also be parallel to the x direction, and the two do not intersect.
  • the microstructure may be disposed only on the light-emitting surface of the light guide plate or at the same time as the light-emitting surface and the bottom surface of the light guide plate to provide a better light-emitting effect and improve light utilization efficiency.

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

Description

导光板及其背光模组
技术领域
本发明涉及液晶显示器技术领域，尤其涉及一种导光板及其背光模组。
背景技术
目前，对于小型、较薄的液晶显示器背光模组多采用发光二极管（Light Emitting Diode，LED）侧光式照明，其中，导光板（Light Guide Panel，LGP）是必不可少的元件。现有的导光板的结构设计中，通常在其底面作合理的微结构分布，利用微结构获取LED入射至导光板中的光。微结构可以将光线散射、反射，最后从导光板上表面出射，达到整个导光板板面的亮度均匀。
请参阅图1，图1是一种现有的背光模组的平面结构示意图。上述背光模组包括一导光板1和一LED灯条4。上述导光板1包括一对应LED灯条4的入光面2、一底面5、一与该底面5相对的出光面（未标号）以及垂直于入光面2的两个侧面（未标号）。图中x方向为平行于导光板1的入光面2的方向；y方向为平行于导光板1的两侧面的方向。上述导光板1的底面5上设有多条平行于x方向的微结构3。
通常，上述导光板1较为理想的出光情况是将光线集中到导光板1的中间区域，符合人眼视觉。通过实验测得，上述导光板1在y方向的出光情况为中间亮度高，边缘亮度低，而在x方向上并不能很好的将光集中到中心，从而造成光能损失，从而降低了光能的利用率。
发明内容
为了解决现有技术的导光板光能的利用率较低的技术问题，有必要提供一种光能利用率较高的导光板及其背光模组。
一种导光板，包括一入光面、一底面和一与所述底面相对的出光面，所述底面和/或出光面上设有多个微结构，所述微结构包括多条第一微结构和多条第二微结构；所述导光板的底面和/或出光面沿与入光面平行的方向划分为左侧、中间、右侧三部分，所述第一微结构分布于左侧部分和中间部分，所述第二微结构分布于中间部分和右侧部分，所述微结构沿平行于入光面方向的分布规则为：导光板的中间微结构排列紧密，两侧微结构排列稀疏。
优选地，多条所述第一微结构相互平行排列；多条所述第二微结构相互平行排列。
优选地，所述第一微结构与第二微结构都平行于导光板的入光面。
优选地，所述第一微结构与第二微结构在中间部分交叉具有一夹角。
优选地，所述导光板进一步包括与入光面垂直的两侧面，在与导光板侧面平行的方向上，所述微结构离入光面越远，分布越紧密。
优选地，所述微结构是形成于导光板的底面的凹槽，其横截面至少为半圆形、菱形或半椭圆形中的一种。
优选地，所述凹槽的开口为长方形。
优选地，各所述微结构的长度相同。
本发明还提出一种导光板，包括一入光面、一底面和一与所述底面相对的出光面，所述底面和/或出光面上设有多个微结构，所述微结构沿平行于入光面方向的分布规则为：导光板的中间微结构排列紧密，两侧微结构排列稀疏。
优选地，所述导光板进一步包括与入光面垂直的两侧面，上述底面沿与入光面平行的方向划分为若干列，每一列包括多个微结构，靠近导光板的两侧面的多个微结构的间距较大，靠近底面中间的多个微结构的间距较小。
优选地，所述微结构为形成于所述导光板的底面的凹槽，所述凹槽的开口为长方形，长度相同，且长边平行于导光板的入光面。
优选地，所述导光板进一步包括与入光面垂直的两侧面，导光板的底面沿与侧面平行的方向划分为若干行，每一行包括多个微结构，微结构的长边平行于导光板的侧面，每一行的微结构在入光面方向上的分别规则为：靠近该行中间的多个微结构之间的间距较小，靠近导光板的两侧面的多个微结构之间的间距较大。
优选地，在与导光板侧面平行的方向上，微结构离入光面越远，分布越紧密。
本发明还提出一种背光模组，包括一光源和一导光板，所述导光板为如上所述的导光板。
本发明提出的一种导光板及其背光模组，通过在导光板的出光面和/或底面设置多个微结构，微结构沿平行于导光板的入光面方向的分布规则为：导光板的中间微结构排列紧密，两侧微结构排列稀疏，上述微结构可使导光板在平行于入光面方向的出光达到中心高、边缘低的亮度分布，提高光能利用率。
附图说明
图1是一种现有的背光模组的平面结构示意图。
图2是本发明背光模组第一实施例的平面结构示意图。
图3是图2所示的背光模组的导光板沿A-A方向的剖视放大图。
图4是本发明背光模组第二实施例的平面结构示意图。
图5是图4所示的背光模组的导光板沿B-B方向的剖视放大图。
图6是本发明背光模组第三实施例的平面结构示意图。
图7是本发明背光模组第四实施例的平面结构示意图。
图8是本发明背光模组第五实施例的平面结构示意图。
图9是本发明背光模组第六实施例的平面结构示意图。
为了使本发明的技术方案更加清楚、明了，下面将结合附图作进一步详述。
具体实施方式
请参阅图2，图2是本发明背光模组第一实施例的平面结构示意图。上述背光模组包括一光源（未标号）和一导光板11，上述光源为一LED灯条，其包括一PCB板13和多个设置在PCB板13上的LED12。上述导光板11包括一对应LED灯条的入光面111、一底面112、一与底面112相对的出光面（图未示）以及与入光面111垂直的两侧面113、114。上述底面112沿与入光面11平行的x方向划分为大致相等的左、中、右三列101、102、103。每一列包括多个微结构10。上述微结构10在与侧面113、114平行的y方向上对齐排列。其中，位于左列101及右列103的微结构10间距较大，位于中列102的微结构10间距较小。
本实施例中，导光板11的底面112包括大致相等且对齐的左、中、右三列101、102、103微结构10，在其他实施例中，微结构10在导光板11的底面112的分布还可以为三列以上，比如四列、五列等，其中微结构10的分布规则仍然是：靠近导光板10的两侧面113、114的列中的多个微结构10的间距较大，靠近导光板10中间的列的多个微结构10的间距较小。而且，多列微结构10中，各列的微结构10的长度也可以不相等。
如图3所示，图3是图2所示的背光模组的导光板沿A-A方向的剖视放大图。本实施例中，微结构10是形成于导光板11的底面112的凹槽，其横截面（图未示）是半圆形，在其它实施例中，微结构10的横截面也可以为菱形或者半椭圆形等。凹槽的开口100是长方形，长度相同，且长边平行于x方向。
相较于现有技术，本实施例导光板11底面112的左列101及右列103的微结构10间距较大，中列102的微结构10间距较小，因此微结构10沿与入光面11平行的x方向的分布规则为：位于导光板11中间的微结构10排列紧密，位于导光板11两侧的微结构10排列稀疏，如此结构分布可以将x方向上光线集中到导光板11的中间区域，使导光板11在x方向的出光达到中心高、边缘低的亮度分布，提高了光能的利用率。
请参阅图4，图4是本发明背光模组第二实施例的平面结构示意图。本实施例中导光板21的底面212沿与侧面213、214平行的y方向划分为大致相等的上、中、下三行201、202、203。每一行包括多个微结构20。上述微结构20在与入光面211平行的x方向上对齐排列。其中，每一行的微结构21在x方向上的分别规则为：位于该行中间的多个微结构20之间的间距较小，靠近导光板21的两侧面213、214的多个微结构21之间的间距较大。上述结构使得微结构20沿与入光面211平行的x方向的分布规则为：位于导光板21中间的微结构20排列紧密，位于导光板21两侧的微结构20排列稀疏。
本实施例中导光板21的底面212沿与侧面213、214平行的y方向包括大致相等的上、中、下三行201、202、203微结构20，在其他实施例中，导光板21的底面212沿与侧面213、214平行的y方向上还可以包括两行或三行以上大致相等或不相等的多行微结构20，每一行中的多个微结构20在x方向上的分别规则为：靠近该行中间的多个微结构20之间的间距较小，靠近导光板21的两侧面213、214的多个微结构21之间的间距较大。
如图5所示，图5是图4所示的背光模组的导光板沿A-A方向的剖视放大图。与上述实施例相似，本实施例中，微结构20是形成于导光板21的底面212的凹槽，其横截面（图未示）是半圆形。在其它实施例中，微结构20的横截面也可以为菱形或者半椭圆形等。凹槽的开口(未标号)是长方形，长度相同，且长边平行于y方向。
请参阅图6，图6是本发明背光模组第三实施例的平面结构示意图，其与上述第一实施例相似，不同之处在于，本实施例中导光板31的每个微结构30长度相同，底面312沿与入光面311平行的x方向划分为不对齐的左、中、右三列301、302、303。每一列包括多个微结构30，且每一列微结构30在与侧面313、314平行的y方向上为不对齐排列。其中，位于左列301及右列303的微结构30间距较大，位于中列302的微结构30间距较小。
在本实施例的变形实施方式中，每个微结构30的长度也可以不相同。
本实施例中导光板31的底面312沿与入光面311平行的x方向划分为不对齐的左、中、右三列301、302、303，在其他实施例中，导光板31的底面312沿与入光面311平行的x方向还可以划分为不对齐的三列以上，比如四列、五列等，每一列包括多个微结构30，各微结构30的长边平行于x方向，该三列以上的微结构30在导光板31的底面312上的分布规则仍然是：靠近导光板31的两侧面313、314的列的多个微结构30间距较大，靠近导光板31的中间的列的微结构30间距较小。
请参阅图7，图7是本发明背光模组第四实施例的平面结构示意图。本实施例中导光板41的底面412的微结构40包括多条相互平行的第一微结构401和多条相互平行的第二微结构402，即多条第一微结构401相互平行排列；多条第二微结构402相互平行排列。上述导光板41的底面412沿x方向划分为大致相等的左侧4121、中间4122以及右侧4123三部分，上述第一微结构401分布于左侧部分4121和中间部分4122，上述第二微结构402分布于中间部分4122和右侧部分4123。第一微结构401与第二微结构402在导光板41的底面412的中间部分4122交叉具有一夹角，因此导光板41的中间的微结构40排列比两侧微结构40的排列紧密。
请参阅图8所示，图8是本发明背光模组第五实施例的平面结构示意图。本实施例中导光板51的各微结构50是无序的相互交错排列，但微结构50沿x方向的分布规则为：导光板51的中间微结构50排列紧密，导光板51的两侧微结构50排列稀疏。
请参阅图9所示，图9是本发明背光模组第六实施例的平面结构示意图，其与上述第一实施例相似，不同之处在于，在与导光板61的侧面（未标号）平行的y方向上，微结构60离入光面611越远，分布越紧密。因为离入光面611越远，传播到的光线越少，通过增加微结构60的密度而达到出光分布均匀的需求。
在上述第二、第三、第四及第五实施例中，导光板的微结构在与导光板侧面平行的y方向上的分布密度都可设置为：微结构60离入光面611越远，分布越紧密，以达到更好的光能利用率。
上述第四实施方式的导光板41的第一微结构401和第二微结构402也可都平行于x方向，两者不交叉。
在其他实施例中，微结构还可以仅仅设置在导光板的出光面上，或者在导光板的出光面与底面同时设置，以起到更好的出光效果，提高光的利用率。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (14)

  1. 一种导光板，包括一入光面、一底面和一与所述底面相对的出光面，其特征在于，所述底面和/或出光面上设有多个微结构，所述微结构包括多条第一微结构和多条第二微结构；所述导光板的底面和/或出光面沿与入光面平行的方向划分为左侧、中间、右侧三部分，所述第一微结构分布于左侧部分和中间部分，所述第二微结构分布于中间部分和右侧部分，所述微结构沿平行于入光面方向的分布规则为：导光板的中间微结构排列紧密，两侧微结构排列稀疏。
  2. 根据权利要求1所述的导光板，其特征在于，多条所述第一微结构相互平行排列；多条所述第二微结构相互平行排列。
  3. 根据权利要求2所述的导光板，其特征在于，所述第一微结构与第二微结构都平行于导光板的入光面。
  4. 根据权利要求2所述的导光板，其特征在于，所述第一微结构与第二微结构在中间部分交叉具有一夹角。
  5. 根据权利要求3或4所述的导光板，其特征在于，所述导光板进一步包括与入光面垂直的两侧面，在与导光板侧面平行的方向上，所述微结构离入光面越远，分布越紧密。
  6. 根据权利要求5所述的导光板，其特征在于，所述微结构是形成于导光板的底面的凹槽，其横截面至少为半圆形、菱形或半椭圆形中的一种。
  7. 根据权利要求6所述的导光板，其特征在于，所述凹槽的开口为长方形。
  8. 根据权利要求7所述的导光板，其特征在于，各所述微结构的长度相同。
  9. 一种导光板，包括一入光面、一底面和一与所述底面相对的出光面，其特征在于，所述底面和/或出光面上设有多个微结构，所述微结构沿平行于入光面方向的分布规则为：导光板的中间微结构排列紧密，两侧微结构排列稀疏。
  10. 根据权利要求9所述的导光板，其特征在于，所述导光板进一步包括与入光面垂直的两侧面，上述底面沿与入光面平行的方向划分为若干列，每一列包括多个微结构，靠近导光板的两侧面的多个微结构的间距较大，靠近底面中间的多个微结构的间距较小。
  11. 根据权利要求10所述的导光板，其特征在于，所述微结构为形成于所述导光板的底面的凹槽，所述凹槽的开口为长方形，长度相同，且长边平行于导光板的入光面。
  12. 根据权利要求11所述的导光板，其特征在于，所述导光板进一步包括与入光面垂直的两侧面，导光板的底面沿与侧面平行的方向划分为若干行，每一行包括多个微结构，微结构的长边平行于导光板的侧面，每一行的微结构在入光面方向上的分别规则为：靠近该行中间的多个微结构之间的间距较小，靠近导光板的两侧面的多个微结构之间的间距较大。
  13. 根据权利要求11或12所述的导光板，其特征在于，在与导光板侧面平行的方向上，微结构离入光面越远，分布越紧密。
  14. 一种背光模组，包括一光源和一导光板，所述导光板为权利要求1-13中任一项所述的导光板。
PCT/CN2011/074308 2011-04-26 2011-05-19 导光板及其背光模组 Ceased WO2012145945A1 (zh)

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