WO2013010343A1 - 导光板及背光模块 - Google Patents

导光板及背光模块 Download PDF

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Publication number
WO2013010343A1
WO2013010343A1 PCT/CN2011/078680 CN2011078680W WO2013010343A1 WO 2013010343 A1 WO2013010343 A1 WO 2013010343A1 CN 2011078680 W CN2011078680 W CN 2011078680W WO 2013010343 A1 WO2013010343 A1 WO 2013010343A1
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WO
WIPO (PCT)
Prior art keywords
strip
section
guide plate
shaped microstructure
light guide
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/CN2011/078680
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English (en)
French (fr)
Inventor
张光耀
方扩军
胡哲彰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/375,338 priority Critical patent/US8821002B2/en
Publication of WO2013010343A1 publication Critical patent/WO2013010343A1/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
    • G02B6/0035—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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of 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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity

Definitions

  • the invention relates to a light guide plate and a backlight module, in particular to a light guide plate and a backlight module capable of improving light extraction efficiency.
  • LED side lighting is often used, and the light guide plate is an indispensable structure.
  • the light guide plate currently used generally has a dot-type light guide plate and a micro-structure light guide plate.
  • the microstructure guide light plate can reduce the process of the dot processing and the transportation cost of the bare plate of the light guide plate to the outlet processing factory. Therefore, manufacturing costs can be saved and the production speed of components can be increased.
  • the microstructured light guide plate also has the following drawbacks: in order to conform to human vision, the ideal light guide plate has high intermediate brightness and low edge brightness.
  • FIG. 1 is a schematic structural view of a prior art light guide plate.
  • the distribution of light in the y direction can be optimized by adjusting the distribution density of the microstructures 111 to adjust the brightness uniformity of the display surface.
  • the existing light guide plate is an entire shape of the microstructure 111 in the extending direction (x direction), which cannot optimize the light distribution in the x direction, thereby reducing the utilization of light energy. . As shown in FIG.
  • the two positions A and B are selected in the x direction, and the luminance measurement map in the y direction is performed.
  • the side line position B of the light guide plate is as shown in FIG.
  • the average brightness is 98%, and the average brightness of the side line position of the dot-type light guide plate is only 92%, which means that the light guide plate cannot effectively concentrate the light to the center in the x direction, resulting in partial effective light source dispersion.
  • the two sides of the light guide plate can not enhance the intermediate brightness, thereby causing the loss of light energy.
  • the light guide plate of the prior art cannot be realized.
  • the present invention is directed to the defects of the prior art light guide plate and the backlight module with low light extraction efficiency, and provides a brightness parameter distribution that can be adjusted by using a change of a curve parameter of a section of the strip microstructure to adjust an extension direction of the strip microstructure.
  • a light guide plate and a backlight module that improve light extraction efficiency are achieved.
  • a main object of the present invention is to provide a light guide plate, wherein the light guide plate comprises: a light incident surface; and a plurality of strip-shaped microstructures disposed on opposite sides of the light exit surface of the light guide plate, parallel to the inlet a smooth surface, wherein a curve parameter of a cross section of the strip-shaped microstructure is changed according to a change in position of an extension direction of the strip-shaped microstructure to adjust a brightness distribution of the strip-shaped microstructure in the extending direction;
  • the curve parameter of the section of the strip-shaped microstructure includes at least one of a radius of curvature, an arc length, a tangent angle of the section curve and the light guide plate, a bottom angle, a width, and a height; each of the strip-shaped microstructures
  • the curve parameters are symmetrically distributed at the center point of the direction in which they extend; the variation of the curve parameters of the strip-shaped microstructure is segmented or continuous.
  • Another object of the present invention is to provide a light guide plate, wherein the light guide plate comprises: a light incident surface; and a plurality of strip-shaped microstructures disposed on opposite sides of the light exit surface of the light guide plate, parallel to the a light surface, wherein a curve parameter of a section of the strip-shaped microstructure is changed according to a positional change of the strip-shaped microstructure to adjust a brightness distribution of the strip-shaped microstructure in the extending direction .
  • Another object of the present invention is to provide a backlight module, including: a light source; and a light guide plate, including: a light incident surface; and a plurality of strips disposed on opposite sides of the light emitting surface of the light guide plate a microstructure, parallel to the light incident surface, wherein a curve parameter of a cross section of the strip microstructure is changed according to a positional change of the strip microstructure, to adjust the strip microstructure
  • a backlight module including: a light source; and a light guide plate, including: a light incident surface; and a plurality of strips disposed on opposite sides of the light emitting surface of the light guide plate a microstructure, parallel to the light incident surface, wherein a curve parameter of a cross section of the strip microstructure is changed according to a positional change of the strip microstructure, to adjust the strip microstructure
  • the brightness distribution in the direction of extension including: a light source; and a light guide plate, including: a light incident surface; and a plurality of strips disposed on opposite sides
  • the curve parameter of the section of the strip-shaped microstructure includes at least one of a radius of curvature, an arc length, a section curve, and a tangent angle, a bottom angle, a width, and a height of the light guide plate.
  • the curve parameters of each strip microstructure are symmetrically distributed at a center point of the extending direction thereof.
  • the strip-shaped microstructure has a cross section with a triangular shape with rounded tops.
  • the center position of the strip-shaped microstructure is greater than the radius of curvature of the rounded corners of the sections at both sides of the strip-shaped microstructure.
  • the height of the cross section of the strip-shaped microstructure when the height of the cross section of the strip-shaped microstructure changes with the position of the extending direction of the strip-shaped microstructure, the height of the cross-section of the center position of the strip-shaped microstructure is smaller than The height of the cross section of the strip-shaped microstructure at both sides.
  • the center position of the strip-shaped microstructure is greater than the arc length of the rounded corner of the cross section of the strip microstructure.
  • the height of the cross section of the strip-shaped microstructure and the radius of curvature of the rounded corner of the strip-shaped microstructure change with the position of the extending direction of the strip-shaped microstructure a radius of curvature of a radius of a cross section of a central portion of the strip-shaped microstructure greater than a radius of curvature of a cross section of a section of the strip-shaped microstructure, a cross-section of a center position of the strip-shaped microstructure The height is less than the height of the section at both sides of the strip-shaped microstructure.
  • the strip-shaped microstructure has a curved surface.
  • the curvature of the section of the strip-shaped microstructure when the radius of curvature of the section of the strip-shaped microstructure changes with the position of the extending direction of the strip-shaped microstructure, the curvature of the section of the center of the strip-shaped microstructure The radius of curvature of the section having a radius smaller than the two sides of the strip-shaped microstructure.
  • the arc length of the cross section of the strip-shaped microstructure when the arc length of the cross section of the strip-shaped microstructure changes with the position of the extending direction of the strip-shaped microstructure, the arc of the cross-section of the center position of the strip-shaped microstructure The arc length of the section longer than the two sides of the strip-shaped microstructure.
  • the height of the cross section of the strip-shaped microstructure when the height of the cross section of the strip-shaped microstructure changes with the position of the extending direction of the strip-shaped microstructure, the height of the cross-section of the center position of the strip-shaped microstructure is greater than The height of the cross section of the strip-shaped microstructure at both sides.
  • the strip-shaped microstructure has a triangular cross section.
  • the height of the cross section of the strip-shaped microstructure when the height of the cross section of the strip-shaped microstructure changes with the position of the extending direction of the strip-shaped microstructure, the height of the cross-section of the center position of the strip-shaped microstructure is greater than The height of the cross section of the strip-shaped microstructure at both sides.
  • the width of the cross section of the strip-shaped microstructure when the width of the cross section of the strip-shaped microstructure changes with the position of the extending direction of the strip-shaped microstructure, the width of the cross-section of the center position of the strip-shaped microstructure is greater than The width of the cross section of the strip-shaped microstructure at both sides.
  • the strip-shaped microstructure is disposed on the opposite side of the light-emitting surface and the light-emitting surface of the light guide plate or on the light-emitting surface of the light guide plate.
  • the variation of the curve parameters of the strip microstructure is segmented or continuous.
  • the curve of the cross section of the light guide plate and the backlight module of the present invention is adjustable, so that the brightness distribution in the extending direction of the strip microstructure can be performed.
  • the adjustment is such that the middle brightness of the light in the x-direction of the light-emitting surface is high, the edge brightness is low, the brightness of the middle area is low, the brightness of the edge is high, or the brightness of the specific area is bright and dark.
  • the curve of the cross section of the light guide plate and the backlight module of the present invention is adjustable, so that the brightness distribution in the extending direction of the strip microstructure can be performed.
  • the adjustment is such that the middle brightness of the light in the x-direction of the light-emitting surface is high, the edge brightness is low, the brightness of the middle area is low, the brightness of the edge is high, or the brightness of the specific area is bright and dark.
  • FIG. 1 is a schematic structural view of a prior art light guide plate
  • 2A is a schematic view showing curve parameters of a preferred embodiment of a strip-shaped microstructure of a light guide plate of the present invention
  • 2B is a schematic view showing curve parameters of another preferred embodiment of the strip microstructure of the light guide plate of the present invention.
  • Figure 3 is a plan view showing a first preferred embodiment of the light guide plate of the present invention.
  • Figure 4 is a schematic cross-sectional view of the a-a of Figure 3;
  • FIG. 5 is a schematic view showing a distribution of curvature radius of a strip-shaped microstructure of a first preferred embodiment of the light guide plate of the present invention
  • Figure 6 is a plan view showing a second preferred embodiment of the light guide plate of the present invention.
  • Figure 7 is a schematic cross-sectional view of the b-b of Figure 6;
  • FIG. 8 is a schematic view showing a width distribution of a strip-shaped microstructure of a second preferred embodiment of the light guide plate of the present invention.
  • Figure 9 is a plan view showing a third preferred embodiment of the light guide plate of the present invention.
  • Figure 10 is a schematic cross-sectional view of the c-c of Figure 9;
  • the backlight module 100 includes a backlight module 100.
  • the backlight module 100 can be a side-lit light-emitting backlight module that is disposed relative to a display panel 101 (eg, a liquid crystal display panel) to form a display device (eg, a liquid crystal display device).
  • the backlight module 100 includes a light guide plate 110 and a light source 120.
  • the light source 120 is, for example, a cold cathode fluorescent tube (Cold Cathode Fluorescent Lamp, CCFL), Light Emitting Diode (LED), Organic Light Emitting Diode (Organic) Light Emitting Diode, OLED), Electro-Luminescence (EL), Light Bar (Light) Bar) or any combination of the above.
  • the light guide plate 110 includes a light incident surface 112 and a bottom surface 113 (opposite side of the light exit surface), and the light incident surface 112 faces the light source 120 for allowing the light of the light source 120 to enter the light guide plate 110.
  • the bottom surface 113 is adjacent to the light incident surface 112.
  • the bottom surface 113 is provided with a plurality of strip-shaped microstructures 111 extending in a direction parallel to the light incident surface 112.
  • the cross-sectional shape of the strip-shaped microstructures 111 may be a circular arc shape (as shown in FIG. 2A), a prismatic shape (as shown in FIG. 2B), or other regular shapes.
  • the light guide plate 110 includes a strip-shaped microstructure 111 disposed on the light guide plate parallel to the light incident surface of the light guide plate, and a curve parameter of the cross section of the strip-shaped microstructure 111
  • the position of the extension direction of the microstructures 111 is changed to change, thereby realizing the adjustment of the luminance distribution of the strip-shaped microstructures 111 in the extending direction.
  • the existing light guide plate is as shown in FIG. 1.
  • the distribution of the strip-shaped microstructures 111 in the y direction is different. Generally, the farther away from the light side, the denser the strip-shaped microstructures 111 are due to the light entering the light side.
  • the light guide plate 110 of the present invention changes the curve parameter of the cross section of each strip-shaped microstructure 111 in the x direction with the position of the extension direction (ie, the x direction) of the strip microstructure 111, so that The intensity of the reflected light of each strip-shaped microstructure 111 in its extending direction is different, so that the luminance distribution in the x direction is also adjusted.
  • Such an adjustment can achieve a uniform light output; it can also achieve high brightness in the middle region, low edge brightness, low brightness in the middle region, high edge brightness, or a bright and dark effect on a specific area.
  • the distribution between the strip-like microstructures of the present invention may be uniform or may be denser as it moves away from the light-incident surface.
  • the curve parameters of the cross section of the strip microstructure 111 may include a radius of curvature, an arc length, a section curve and a tangent angle, a bottom angle, a width, and a height of the light guide plate.
  • the strip microstructure 111 can be optimized by individually changing a certain curve parameter of the strip microstructure 111 such as a radius of curvature or a width, or a combination of a plurality of curve parameters such as a tangent angle and a curvature.
  • the strip microstructures 111 are optimized by a combination of radii and the like.
  • the curve parameters of the cross section are different, so that the shape of the cross section is different, and the light extraction rate is different, thereby achieving the purpose of adjusting the brightness distribution in the x direction.
  • a schematic diagram of the curve parameters of the specific strip microstructure 111 is shown in FIGS. 2A and 2B, where A is the arc length of the section, R is the radius of curvature of the section, and ⁇ is the tangent angle of the section curve and the microstructured light guide plate, ⁇ 1 And ⁇ 2 is the bottom angle of the cross-sectional shape, L is the width of the cross-section, and H is the height of the cross-section.
  • A is the arc length of the section
  • R is the radius of curvature of the section
  • ⁇ is the tangent angle of the section curve and the microstructured light guide plate
  • ⁇ 1 And ⁇ 2 is the bottom angle of the cross-sectional shape
  • L is the width of the cross-section
  • H is the height of the cross-section.
  • the rate of curvature change can also affect the shape of the cross-section.
  • the strip microstructure 111 can be adjusted by a single adjustment or combination of a plurality of curve parameters, and the user can select an appropriate adjustment method according to the actual use condition, but as long as the strip microstructure is changed by changing the sectional shape of the strip microstructure 111. Adjustment of the luminance distribution in the extending direction is within the scope of the present invention.
  • the curve parameters of each of the strip-shaped microstructures 111 are symmetrically distributed at the center point of the direction in which they extend. That is, the curve parameter is symmetrically distributed along the center origin to the edge in the x direction.
  • the curve parameter changes along the center origin to the edge in the x direction, it may be monotonically increasing, monotonically decreasing or non-monotonic, and the curve parameter is centrally symmetric.
  • the shape of the strip-shaped microstructures 111 can be more regular, so that the brightness distribution in the x direction can be better controlled, the optimal brightness distribution can be achieved, the utilization of light energy can be improved, and the strip-shaped microstructures symmetrically distributed 111 Processing is also more convenient.
  • the strip-shaped microstructures 111 may be disposed on opposite sides (bottom surfaces) of the light-emitting surface of the light guide plate and/or on the light-emitting surface of the light guide plate.
  • the strip-shaped microstructures 111 of the light guide plate of the present invention are arranged to adjust the brightness distribution in the x direction, and the strip-shaped microstructures 111 are disposed on the light-emitting surface of the light guide plate, on the opposite side of the light-emitting surface of the light guide plate, and at the same time
  • the light-emitting surface of the light guide plate and the opposite side of the light-emitting surface can reach the brightness distribution in the x-direction, and the user can select a suitable light-guide plate processing method according to the need to generate the corresponding strip-shaped microstructure 111.
  • FIG. 3 is a plan view of a first embodiment of a light guide plate of the present invention.
  • the strip-shaped microstructure 211 of the light guide plate 210 has a cross section with a rounded corner at the top.
  • the radius of curvature of the cross-section of the strip-shaped microstructure 211 varies with the position of the strip-shaped microstructure 211 in the direction of extension. As shown in FIG. 3, the radius of curvature of the cross-section of the strip-shaped microstructure 211 is symmetrically distributed.
  • the radius of curvature is small, so that the light in the middle of the strip-shaped microstructure 211 is easier to achieve the purpose of adjusting the brightness distribution in the x-direction.
  • 4 is a schematic cross-sectional view showing the strip-shaped microstructure 211 of the first preferred embodiment of the light guide plate of the present invention, and it can be seen from the figure that the radius of curvature of the cross section of the strip-shaped microstructure 211 changes.
  • the height of the cross section of the strip-shaped microstructure 211 also changes as the position of the strip-shaped microstructure 211 extends, and the height of the cross-section of the strip-shaped microstructure 211 is lower, and both sides of the strip-shaped microstructure 211
  • the height of the cross section of the position is high; the arc length of the cross section of the strip microstructure 211 also changes with the position of the extending direction of the strip microstructure 211, and the rounded corner of the section of the strip microstructure 211 is represented.
  • the arc length is large, and the rounded arc length of the cross section at both sides of the strip microstructure 211 is small.
  • the radius of curvature of the section of the strip-shaped microstructure 211 and the direction of extension of the strip-shaped microstructure 211 can be seen.
  • the radius of curvature of the section at the intermediate position of the strip-shaped microstructure 211 is large, and the radius of curvature of the section at both sides of the strip-shaped microstructure 211 is small.
  • the radius of curvature of the strip-shaped microstructure of the light guide plate of the present embodiment may be: the radius of curvature of the section at the intermediate position of the strip-shaped microstructure 211 is large, and the section of the strip-shaped microstructure 211 is located at both sides according to the brightness requirements of the different regions. The radius of curvature is small.
  • the parameter variations of the strip microstructure 211 of the present invention may be segmented or continuous.
  • FIG. 6 is a top view of a second embodiment of a light guide plate of the present invention.
  • the strip-shaped microstructure 311 of the light guide plate 310 has a triangular cross section.
  • the width of the cross section of the strip-shaped microstructure 311 varies with the position of the extending direction of the strip-shaped microstructure 311. As shown in FIG. 6, the width of the cross-section of the strip-shaped microstructure 311 is symmetrically distributed, and the strip-shaped microstructure 311 is located at the intermediate position.
  • the width of the cross section is large, and the width of the cross section at the position of the strip microstructure 311 is small, so that the middle position of the strip microstructure 311 can destroy more total reflection of light to adjust the brightness distribution in the x direction (the middle brightness is high, The purpose of low edge brightness).
  • Figure 7 is a schematic cross-sectional view showing the strip-shaped microstructure 311 of the second preferred embodiment of the light guide plate of the present invention. It can be seen from the figure that the strip-shaped microstructure 311 has a stripe width which is changed. The height of the microstructure 311 also changes as the position of the strip-shaped microstructure 311 changes, indicating that the height of the section at the intermediate position of the strip-shaped microstructure 311 is higher, and the height of the section at both sides of the strip-shaped microstructure 311 is higher. low.
  • the strip microstructure of the light guide plate of the present embodiment may also have a tendency to change: the height of the cross section of the strip microstructure 311 is small, the width is small, and the strip microstructure 311 is positioned at both sides.
  • the cross section has a large height and a large width.
  • the parameter variations of the strip microstructure 311 of the present invention may be segmented or continuous.
  • FIG. 9 is a plan view of a third embodiment of the light guide plate of the present invention.
  • the strip-shaped microstructure 411 of the light guide plate 410 has a curved surface.
  • the radius of curvature of the section of the strip-shaped microstructure 411 varies with the position of the extending direction of the strip-shaped microstructure 411. As shown in FIG. 9, the radius of curvature of the section of the strip-shaped microstructure 411 is symmetrically distributed, and the strip-shaped microstructure 411 is intermediate The radius of curvature of the section of the position is small, and the radius of curvature of the section of the section of the strip-shaped microstructure 411 is large, so that the light in the middle of the strip-shaped microstructure 411 is easier to adjust the brightness distribution in the x direction. .
  • Figure 10 is a schematic cross-sectional view showing the strip-shaped microstructure 411 of the third preferred embodiment of the light guide plate of the present invention. It can be seen from the figure that since the radius of curvature of the section of the strip-shaped microstructure 411 changes, the strip The height of the cross section of the microstructure 411 also changes as the position of the strip microstructure 411 changes, indicating that the height of the cross section at the intermediate position of the strip microstructure 411 is high, and the cross section of the strip microstructure 411 is located at both sides.
  • the height of the rounded corner of the strip-shaped microstructure 411 also changes with the position of the extending direction of the strip-shaped microstructure 411, and the arc length of the cross-section of the section at the middle of the strip-shaped microstructure 411 is expressed. Larger, the cross-section of the cross-section of the strip-shaped microstructure 411 has a smaller arc length.
  • the variation trend of the strip-like microstructure of the light guide plate of the present embodiment may be that the radius of curvature of the section at the intermediate position of the microstructure 411 is small, and the section of the strip-shaped microstructure 411 is at a position of both sides of the strip-shaped microstructure 411. The radius of curvature of the fillet is large.
  • the parameter variations of the strip microstructures 411 of the present invention may be segmented or continuous.
  • the invention also relates to a backlight module, comprising a light guide plate, wherein the light guide plate comprises a strip-shaped microstructure disposed on the light guide plate and parallel to the light incident surface of the light guide plate, wherein the curve parameter of the section of the strip-shaped microstructure is strip-shaped
  • the position of the extension direction of the structure changes to adjust the brightness distribution of the strip-like microstructure in the extending direction.
  • the curve parameters of the section of the strip microstructure include at least one of a radius of curvature, an arc length, a section curve and a tangent angle, a base angle, a width, and a height of the light guide plate.
  • the curve parameters of each strip microstructure are symmetrically distributed at the center point of the direction in which they extend.
  • the curve parameters of the cross section of the strip-shaped microstructure of the light guide plate and the backlight module of the present invention are adjustable, so that the brightness distribution in the extending direction of the strip-shaped microstructure can be adjusted so that the intermediate brightness of the light-emitting surface x direction High, low edge brightness, to achieve the effect of improving light extraction efficiency.

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Abstract

一种导光板（110、210、310、410）及背光模块（100）。所述背光模块（100）包括导光板（110、210、310、410），所述导光板（110、210、310、410）包括设置在所述导光板（110、210、310、410）上、与所述导光板（110、210、310、410）的入光面（112）平行的条状微结构（111、211、311、411），所述条状微结构（111、211、311、411）的截面的曲线参数随所述条状微结构（111、211、311、411）的延伸方向位置变化而改变。所述导光板（110、210、310、410）可利用条状微结构（111、211、311、411）的截面的曲线参数的改变来调节所述条状微结构（111、211、311、411）的延伸方向的亮度分布，以达到提高出光效率的效果。

Description

导光板及背光模块 技术领域
本发明涉及一种导光板及背光模块，特别是涉及一种可提高出光效率的导光板及背光模块。
 背景技术
目前，对于小型、较薄的背光模块，多采用LED侧光式照明，其中导光板是必不可少的结构。
现在采用的导光板一般有网点式导光板和微结构导光板，相比网点式导光板，微结构导光板可减少网点加工的制程工序及导光板的裸板运至网点加工厂的运输费用，因而可节省制造成本，且能增加部件的生产速度。
但是微结构导光板也具有以下缺陷：为了符合人眼视觉，理想导光板的中间亮度高，而边缘亮度低。请参照图1，其为现有技术的导光板的结构示意图。对于y方向的光，可通过调节微结构111的分布疏密对y方向的光的分布进行优化，调整显示面亮度均匀性。在对于x方向的光，现有的导光板由于在延伸方向（x方向）上是整条形状的微结构111，其无法对x方向上的光分布进行优化，从而降低了光能的利用率。如图1所示，在x方向上选定两个位置A和B，做y方向的亮度量测图，若中心线位置A的平均亮度为100%的话，则导光板的侧边线位置B的平均亮度为98%，而网点式导光板的侧边线位置的平均亮度仅为92%，这说明，导光板在x方向上并不能有效的将光集中到中心，导致部分有效光源分散到导光板的两侧，不能起到加强中间亮度的作用，从而造成光能的损失；同时当用户需要将导光板的出光使用其他的方式进行分布时，原有技术的导光板也无法实现。
故，有必要提供一种导光板及背光模块，以解决现有技术所存在的问题。
 技术问题
本发明针对现有技术的导光板以及背光模块出光效率低的缺陷，提供一种可利用条状微结构的截面的曲线参数的改变来调节所述条状微结构的延伸方向的亮度分布，以达到提高出光效率的导光板以及背光模块。
 技术解决方案
本发明的主要目的在于提供一种导光板，其中所述导光板包括：入光面；以及多个设置在所述导光板的出光面的对侧上的条状微结构，平行于所述入光面，其中所述条状微结构的截面的曲线参数是随所述条状微结构的延伸方向位置变化而改变，以调节所述条状微结构在所述延伸方向上的亮度分布；所述条状微结构的截面的曲线参数包括为曲率半径、弧长、截面曲线与所述导光板的相切角、底角、宽度以及高度中的至少一个；所述每个条状微结构的曲线参数以其延伸方向的中心点对称分布；所述条状微结构的曲线参数的变化为分段或连续的。
本发明的另一目的还在于提供一种导光板，其中所述导光板包括：入光面；以及多个设置在所述导光板的出光面的对侧上的条状微结构，平行于所述入光面，其中所述条状微结构的截面的曲线参数是随所述条状微结构的延伸方向位置变化而改变，以调节所述条状微结构在所述延伸方向上的亮度分布。
本发明的另一目的还在于提供一种背光模块，所述背光模块包括：光源；以及导光板，包括：入光面；以及多个设置在所述导光板的出光面的对侧上的条状微结构，平行于所述入光面，其中所述条状微结构的截面的曲线参数是随所述条状微结构的延伸方向位置变化而改变，以调节所述条状微结构在所述延伸方向上的亮度分布。
在本发明的一实施例中，所述条状微结构的截面的曲线参数包括为曲率半径、弧长、截面曲线与所述导光板的相切角、底角、宽度以及高度中的至少一个。
在本发明的一实施例中，所述每个条状微结构的曲线参数以其延伸方向的中心点对称分布。
在本发明的一实施例中，所述条状微结构的截面为顶部具有圆角的三角形。
在本发明的一实施例中，当所述条状微结构的截面的圆角的曲率半径随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的圆角的曲率半径大于所述条状微结构的两侧位置的截面的圆角的曲率半径。
在本发明的一实施例中，当所述条状微结构的截面的高度随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的高度小于所述条状微结构的两侧位置的截面的高度。
在本发明的一实施例中，当所述条状微结构的截面的圆角的弧长随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的圆角的弧长大于所述条状微结构的两侧位置的截面的圆角的弧长。
在本发明的一实施例中，当所述条状微结构的截面的高度和所述条状微结构的截面的圆角的曲率半径随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的圆角的曲率半径大于所述条状微结构的两侧位置的截面的圆角的曲率半径，所述条状微结构的中心位置的截面的高度小于所述条状微结构的两侧位置的截面的高度。
在本发明的一实施例中，所述条状微结构的截面为曲面型。
在本发明的一实施例中，当所述条状微结构的截面的曲率半径随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的曲率半径小于所述条状微结构的两侧位置的截面的曲率半径。
在本发明的一实施例中，当所述条状微结构的截面的弧长随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的弧长大于所述条状微结构的两侧位置的截面的弧长。
在本发明的一实施例中，当所述条状微结构的截面的高度随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的高度大于所述条状微结构的两侧位置的截面的高度。
在本发明的一实施例中，所述条状微结构的截面为三角形。
在本发明的一实施例中，当所述条状微结构的截面的高度随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的高度大于所述条状微结构的两侧位置的截面的高度。
在本发明的一实施例中，当所述条状微结构的截面的宽度随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的宽度大于所述条状微结构的两侧位置的截面的宽度。
在本发明的一实施例中，所述条状微结构同时设置在所述导光板的出光面和出光面的对侧上或设置在所述导光板的出光面上。
在本发明的一实施例中，所述条状微结构的曲线参数的变化为分段或连续的。
相较于现有的导光板具有出光效率低的问题，本发明的导光板和背光模块的条状微结构的截面的曲线参数可调，因此可以对条状微结构的延伸方向的亮度分布进行调整，使得出光面x方向的光中间亮度高，边缘亮度低；中间区域亮度低，边缘亮度高；或者特定区域的亮暗的效果。
 有益效果
相较于现有的导光板具有出光效率低的问题，本发明的导光板和背光模块的条状微结构的截面的曲线参数可调，因此可以对条状微结构的延伸方向的亮度分布进行调整，使得出光面x方向的光中间亮度高，边缘亮度低；中间区域亮度低，边缘亮度高；或者特定区域的亮暗的效果。
附图说明
图1为现有技术导光板的结构示意图；
图2A为本发明导光板的条状微结构的优选实施例的曲线参数的示意图；
图2B为本发明导光板的条状微结构的另一优选实施例的曲线参数的示意图；
图3为本发明导光板的第一优选实施例的俯视图；
图4为图3的a-a截面结构示意图；
图5为本发明导光板的第一优选实施例的条状微结构的曲率半径分布示意图；
图6为本发明导光板的第二优选实施例的俯视图；
图7为图6的b-b截面结构示意图；
图8为本发明导光板的第二优选实施例的条状微结构的宽度分布示意图；
图9为本发明导光板的第三优选实施例的俯视图；
图10为图9的c-c截面结构示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
在图中，结构相似的单元是以相同标号表示。
请参照图2A及图2B，其为本发明导光板的条状微结构的优选实施例的曲线参数的示意图。图中包括背光模块100，背光模块100可为侧向式入光的背光模块，其相对于一显示面板101（例如液晶显示面板）来设置，而形成一显示装置（例如液晶显示装置）。背光模块100包括导光板110及光源120。光源120例如为冷阴极荧光灯管（Cold Cathode Fluorescent Lamp，CCFL）、发光二极管(Light Emitting Diode，LED)、有机发光二极管(Organic Light Emitting Diode，OLED)、电激发光组件(Electro-Luminescence，EL)、发光灯条(Light Bar)或上述的任意组合。导光板110包括入光面112及底面113（出光面的对侧），入光面112是面对于光源120，用以允许光源120的光线进入导光板110。该底面113邻近该入光面112，该底面113上设置有多个条状微结构111，该条状微结构111沿着是平行于入光面112的方向延伸。其中，条状微结构111的截面形状可为圆弧形（如图2A所示）、棱形（如图2B所示）或其他有规则的形状。
在本发明的导光板的优选实施例中，导光板110包括设置在导光板上的，与导光板的入光面平行的条状微结构111，条状微结构111的截面的曲线参数随条状微结构111的延伸方向位置变化而改变，从而实现了调节条状微结构111在延伸方向上的亮度分布。现有的导光板如图1所示，条状微结构111在y方向上分布疏密是有区别的，一般离入光侧越远，条状微结构111越密，原因是离入光侧越远，传播到的光线越少，因而需要设置更多的条状微结构111产生更多的全反射破坏以增加亮度，达到调整y方向亮度分布的需求，但是在x方向不能进行亮度调节。本发明的导光板110相比现有的导光板，在x方向的每个条状微结构111的截面的曲线参数随条状微结构111的延伸方向（即x方向）位置变化而改变，使得每个条状微结构111在其延伸方向的反射光的强度是不同的，从而对x方向的亮度分布也进行了调整。这样的调整可以实现出光均匀的效果；也可以实现中间区域亮度高，边缘亮度低；中间区域亮度低，边缘亮度高；或者特定区域的亮暗的效果。本发明的条状微结构的之间的分布可以是均匀的，也可以是越远离入光面越密集。
在本发明的导光板的优选实施例中，条状微结构111的截面的曲线参数可包括曲率半径、弧长、截面曲线与导光板的相切角、底角、宽度以及高度。在本发明中，可以通过单独改变条状微结构111的某个曲线参数如曲率半径或宽度等，对条状微结构111进行优化，也可以通过多个曲线参数的组合如相切角与曲率半径的组合等，对条状微结构111进行优化。截面的曲线参数不同，从而截面的形状就不同，对光线取出率也就不同，从而达到调整x方向亮度分布的目的。具体条状微结构111的曲线参数的示意图如图2A及图2B所示，其中A为截面的弧长，R为截面的曲率半径，θ为截面曲线与微结构导光板的相切角，θ1及θ2为截面形状的底角，L为截面的宽度，H为截面的高度。当然也可采用其他可改变截面形状的曲线参数，如截面采用变曲率曲线时，曲率变化率也可影响截面的形状等。条状微结构111可通过多种曲线参数的单一调整或组合调整，用户可以根据实际的使用情况选择合适的调整方式，但是只要是通过改变条状微结构111的截面形状对条状微结构111在延伸方向上的亮度分布进行调整就属于本发明的保护范围。
在本发明的导光板的优选实施例中，每个条状微结构111的曲线参数是以其延伸方向的中心点对称分布。即曲线参数在x方向沿中心原点向边缘的变化呈中心对称分布，曲线参数在x方向沿中心原点向边缘变化时可以是单调递增、单调递减或非单调变化，由于曲线参数的变化呈中心对称分布后，条状微结构111的形状可更加具有规律性，因而可更好控制的x方向的亮度分布，达到最优的亮度分布，提高光能利用率，同时对称分布的条状微结构111加工也更加方便。
在本发明的优选实施例中，条状微结构111可设置在导光板的出光面的对侧（底面）和/或设置在导光板的出光面上。本发明的导光板的条状微结构111设置的目的在于调整x方向的亮度分布，而条状微结构111设置在导光板的出光面、设置在导光板的出光面的对侧以及同时设置在导光板的出光面和出光面的对侧均可达到调整x方向的亮度分布，用户可以根据需要选择合适的导光板的加工方法以产生相应的条状微结构111。
请参照图3，其为本发明导光板的第一实施例的俯视图。
在本实施例中，导光板210的条状微结构211的截面为顶部具有圆角的三角形。条状微结构211的截面的圆角的曲率半径随条状微结构211的延伸方向位置变化而改变，如图3所示，条状微结构211的截面的圆角的曲率半径呈对称分布，条状微结构211中间位置的截面的圆角的曲率半径较大（这里指的是曲率半径，不是曲率，曲率=1/曲率半径），条状微结构211两侧位置的截面的圆角的曲率半径较小，这样使得条状微结构211中间位置出光更加容易以达到调整x方向的亮度分布的目的。图4所示的是本发明的导光板的第一优选实施例的条状微结构211的截面结构示意图，从图中可以看出由于条状微结构211的截面的圆角的曲率半径发生变化，因此条状微结构211的截面的高度也随着条状微结构211的延伸方向位置变化而改变，表现为条状微结构211中间位置的截面的高度较低，条状微结构211两侧位置的截面的高度较高；条状微结构211的截面的圆角的弧长也随条状微结构211的延伸方向位置变化而改变，表现为条状微结构211中间位置的截面的圆角的弧长较大，条状微结构211两侧位置的截面的圆角的弧长较小。在图5所示的本发明导光板的第一优选实施例的条状微结构211的曲率半径分布示意图中可以看到条状微结构211的截面的曲率半径和条状微结构211的延伸方向位置的关系，图中也可看出条状微结构211中间位置的截面的曲率半径大，条状微结构211两侧位置的截面的曲率半径小。根据不同的区域亮度要求，本实施例的导光板的条状微结构的曲率半径也可以是：条状微结构211中间位置的截面的曲率半径较大，条状微结构211两侧位置的截面的曲率半径较小。本发明的条状微结构211的参数变化可以是分段的，也可以是连续的。
请参照图6，其为本发明导光板的第二实施例的俯视图。
本实施例中，导光板310的条状微结构311的截面为三角形。条状微结构311的截面的宽度随条状微结构311的延伸方向位置变化而改变，如图6所示，条状微结构311的截面的宽度呈对称分布，条状微结构311中间位置的截面的宽度较大，条状微结构311两侧位置的截面的宽度较小，这样使得条状微结构311中间位置可以破坏更多光的全反射达到调整x方向的亮度分布（中间亮度高，边缘亮度低）的目的。图7所示的是本发明的导光板的第二优选实施例的条状微结构311的截面结构示意图，从图中可以看出由于条状微结构311的截面的宽度发生变化，因此条状微结构311的高度也随着条状微结构311的延伸方向位置变化而改变，表现为条状微结构311中间位置的截面的高度较高，条状微结构311两侧位置的截面的高度较低。在图8所示的本发明导光板的第二优选实施例的条状微结构311的宽度分布示意图中可以看到条状微结构311的截面的宽度和条状微结构311的延伸方向位置的关系，图中也可看出条状微结构311中间位置的截面的宽度较大，条状微结构311两侧位置的截面的宽度较小。根据不同的区域亮度要求，本实施例的导光板的条状微结构的变化趋势也可以是：条状微结构311中间位置的截面的高度较小、宽度小，条状微结构311两侧位置的截面的高度大、宽度大。本发明的条状微结构311的参数变化可以是分段的，也可以是连续的。
请参照图9，其为本发明导光板的第三实施例的俯视图。
本实施例中，导光板410的条状微结构411的截面为曲面型。条状微结构411的截面的曲率半径随条状微结构411的延伸方向位置变化而改变，如图9所示，条状微结构411的截面的曲率半径呈对称分布，条状微结构411中间位置的截面的曲率半径较小，条状微结构411两侧位置的截面的圆角的曲率半径较大，这样使得条状微结构411中间位置出光更加容易以达到调整x方向的亮度分布的目的。图10所示的是本发明的导光板的第三优选实施例的条状微结构411的截面结构示意图，从图中可以看出由于条状微结构411的截面的曲率半径发生变化，因此条状微结构411的截面的高度也随着条状微结构411的延伸方向位置变化而改变，表现为条状微结构411中间位置的截面的高度较高，条状微结构411两侧位置的截面的高度较低；条状微结构411的截面的圆角的弧长也随条状微结构411的延伸方向位置变化而改变，表现为条状微结构411中间位置的截面的圆角的弧长较大，条状微结构411两侧位置的截面的圆角的弧长较小。根据不同的区域亮度要求，本实施例的导光板的条状微结构的变化趋势也可以是：状微结构411中间位置的截面的曲率半径较小，条状微结构411两侧位置的截面的圆角的曲率半径较大。本发明的条状微结构411的参数变化可以是分段的，也可以是连续的。
本发明还涉及一种背光模块，包括导光板，导光板包括设置在导光板上、与导光板的入光面平行的条状微结构，其中条状微结构的截面的曲线参数随条状微结构的延伸方向位置变化而改变以调节条状微结构的在延伸方向上的亮度分布。条状微结构的截面的曲线参数包括：曲率半径、弧长、截面曲线与导光板的相切角、底角、宽度以及高度中的至少一个。每个条状微结构的曲线参数是以其延伸方向的中心点对称分布。本发明的背光模块的具体实现方式和有益效果请参见上述的导光板的具体实施例。
由上述可知，本发明的导光板及背光模块的条状微结构的截面的曲线参数可调，因此可以对条状微结构的延伸方向的亮度分布进行调整，使得出光面x方向的光中间亮度高，边缘亮度低，达到提高出光效率的效果。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
工业实用性
序列表自由内容

Claims (20)

  1. 一种导光板，其特征在于：所述导光板包括：
    入光面；以及
    多个设置在所述导光板的出光面的对侧上的条状微结构，平行于所述入光面，其中所述条状微结构的截面的曲线参数是随所述条状微结构的延伸方向位置变化而改变，以调节所述条状微结构在所述延伸方向上的亮度分布；
    所述条状微结构的截面的曲线参数包括为曲率半径、弧长、截面曲线与所述导光板的相切角、底角、宽度以及高度中的至少一个；
    所述每个条状微结构的曲线参数以其延伸方向的中心点对称分布；
    所述条状微结构的曲线参数的变化为分段或连续的。
  2. 一种导光板，其特征在于：所述导光板包括：
    入光面；以及
    多个设置在所述导光板的出光面的对侧上的条状微结构，平行于所述入光面，其中所述条状微结构的截面的曲线参数是随所述条状微结构的延伸方向位置变化而改变，以调节所述条状微结构在所述延伸方向上的亮度分布。
  3. 根据权利要求2所述的导光板，其特征在于，所述条状微结构的截面的曲线参数包括为曲率半径、弧长、截面曲线与所述导光板的相切角、底角、宽度以及高度中的至少一个。
  4. 根据权利要求3所述的导光板，其特征在于，所述每个条状微结构的曲线参数以其延伸方向的中心点对称分布。
  5. 根据权利要求3所述的导光板，其特征在于，所述条状微结构的截面为顶部具有圆角的三角形。
  6. 根据权利要求5中任一的所述的导光板，其特征在于，当所述条状微结构的截面的圆角的曲率半径随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的圆角的曲率半径大于所述条状微结构的两侧位置的截面的圆角的曲率半径。
  7. 根据权利要求5所述的导光板，其特征在于，当所述条状微结构的截面的高度随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的高度小于所述条状微结构的两侧位置的截面的高度。
  8. 根据权利要求5所述的导光板，其特征在于，当所述条状微结构的截面的圆角的弧长随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的圆角的弧长大于所述条状微结构的两侧位置的截面的圆角的弧长。
  9. 根据权利要求5所述的导光板，其特征在于，当所述条状微结构的截面的高度和所述条状微结构的截面的圆角的曲率半径随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的圆角的曲率半径大于所述条状微结构的两侧位置的截面的圆角的曲率半径，所述条状微结构的中心位置的截面的高度小于所述条状微结构的两侧位置的截面的高度。
  10. 根据权利要求3所述的导光板，其特征在于，所述条状微结构的截面为三角形。
  11. 根据权利要求10所述的导光板，其特征在于，当所述条状微结构的截面的高度随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的高度大于所述条状微结构的两侧位置的截面的高度。
  12. 根据权利要求10所述的导光板，其特征在于，当所述条状微结构的截面的宽度随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的宽度大于所述条状微结构的两侧位置的截面的宽度。
  13. 根据权利要求3所述的导光板，其特征在于，所述条状微结构的截面为曲面型。
  14. 根据权利要求13中任一的所述的导光板，其特征在于，当所述条状微结构的截面的曲率半径随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的曲率半径小于所述条状微结构的两侧位置的截面的曲率半径。
  15. 根据权利要求13所述的导光板，其特征在于，当所述条状微结构的截面的弧长随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的弧长大于所述条状微结构的两侧位置的截面的弧长。
  16. 根据权利要求13所述的导光板，其特征在于，当所述条状微结构的截面的高度随所述条状微结构的延伸方向位置变化而改变时，所述条状微结构的中心位置的截面的高度大于所述条状微结构的两侧位置的截面的高度。
  17. 根据权利要求2所述的导光板，其特征在于，所述条状微结构同时设置在所述导光板的出光面和出光面的对侧上或设置在所述导光板的出光面上。
  18. 根据权利要求1所述的导光板，其特征在于，所述条状微结构的曲线参数的变化为分段或连续的。
  19. 一种背光模块，其特征在于，所述背光模块包括：
    光源；以及
    导光板，包括：
    入光面；以及
    多个设置在所述导光板的出光面的对侧上的条状微结构，平行于所述入光面，其中所述条状微结构的截面的曲线参数是随所述条状微结构的延伸方向位置变化而改变，以调节所述条状微结构在所述延伸方向上的亮度分布。
  20. 根据权利要求19所述的背光模块，其特征在于，所述条状微结构的截面的曲线参数为曲率半径、弧长、截面曲线与所述导光板的相切角、底角、宽度以及高度中的至少一个。
PCT/CN2011/078680 2011-07-20 2011-08-22 导光板及背光模块 Ceased WO2013010343A1 (zh)

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