WO2014146356A1 - 导光板、背光模组和液晶显示装置 - Google Patents

导光板、背光模组和液晶显示装置 Download PDF

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Publication number
WO2014146356A1
WO2014146356A1 PCT/CN2013/077014 CN2013077014W WO2014146356A1 WO 2014146356 A1 WO2014146356 A1 WO 2014146356A1 CN 2013077014 W CN2013077014 W CN 2013077014W WO 2014146356 A1 WO2014146356 A1 WO 2014146356A1
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WIPO (PCT)
Prior art keywords
light
guide plate
light guide
protrusions
protrusion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/077014
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English (en)
French (fr)
Inventor
马一鸿
肖立川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Publication of WO2014146356A1 publication Critical patent/WO2014146356A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • G02B6/0035—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

Definitions

  • Light guide plate, backlight module and liquid crystal display device are Light guide plate, backlight module and liquid crystal display device
  • Embodiments of the present invention relate to a light guide plate, a backlight module, and a liquid crystal display device. Background technique
  • Liquid crystal displays dominate the current flat panel display market due to their small size, low power consumption, and low radiation.
  • the liquid crystal display since the liquid crystal itself does not emit light, it only regulates the light, so in order to display an image on the screen of the liquid crystal display, it is necessary to configure a backlight module for the display panel (BLU) in the liquid crystal display (BLU, Back Light) Unit ).
  • BLU display panel
  • BLU Back Light
  • the light-emitting effect (brightness, uniformity, etc.) of the backlight module will directly affect the visual effect of the liquid crystal display.
  • the backlight module can be divided into a direct type backlight module and a side-in type backlight module according to different positions of the light source.
  • the side-in type backlight module has been widely concerned because of its lighter weight and lower energy consumption.
  • Side-lit backlight modules typically include a light source, a light guide, and an optical diaphragm.
  • a light guide plate in the prior art is designed to add a linear inverted V-shaped protrusion on the light-emitting surface of the light guide plate. As shown in Fig. 1, the light guide plate includes a light guide plate body 1, a light incident surface, a reflection surface, a light exit surface, and the like.
  • the light exit surface of the light guide plate is provided with linear inverted inverted V-shaped projections 2 arranged in parallel.
  • the linear inverted V-shaped protrusion 2 extends in a straight line along its length direction, and has a triangular cross section, that is, an inverted V-shape, and a micro-structural design of an inverted V-shaped projection can obtain concentrated light, Increase the effect of the brightness in the vertical direction of the light surface.
  • the brightness of the light guide plate having the structure is limited, and since the linear inverted V-shaped convex microstructures are arranged in one direction, the light-emitting surface is emitted in the lateral direction and the longitudinal direction.
  • the viewing angle is different, and it is also possible to generate interference fringes, which ultimately affect the display quality. Summary of the invention
  • Embodiments of the present invention provide a light guide plate capable of improving the light-emitting brightness of the light guide plate while ensuring that the light-emitting surface of the light guide plate has a viewing angle of view in the lateral direction and the longitudinal direction, and interference fringes can be avoided.
  • a light guide plate is provided.
  • the light guide plate may include: a light guide plate body and a light exit surface on the light guide plate body, wherein the light exit surface is provided with a plurality of columns of first protrusions parallel to each other, each The first projection of the column runs in a corrugated manner along its length.
  • the cross section of the first protrusion may be a triangle, and the apex angle of the triangle may be an arc angle.
  • the angle of the apex angle of the cross section of the first protrusion may be 90. ⁇ 120. .
  • the corrugated course of the first projection may be a sinusoidal waveform.
  • the light guide plate may further include: a plurality of second protrusions parallel to the first protrusions, disposed on a light-emitting surface between each adjacent two rows of first protrusions, and the height of the second protrusions may be Less than the height of the first protrusion, the cross section of the second protrusion may be a triangle, and the angle of the apex angle of the cross section of the second protrusion may be 90. ⁇ 120. .
  • the light guide plate may further include: diffusion particles uniformly distributed on the light-emitting surface between each adjacent two rows of the first protrusions, the diffusion particles having a height smaller than a height of the first protrusions.
  • the light guide plate may further include a reflective surface on the light guide plate body opposite to the light exit surface, and the reflective surface is provided with a plurality of optical mesh points, and the shape of the optical mesh dots may be circular or polygonal.
  • the light guide plate may further include a side on the light guide plate body and the light exit surface and the reflective surface, wherein the W-shape is formed by a vertices of a plurality of first raised triangular cross-sections.
  • the embodiment of the present invention further provides a backlight module, comprising a light source and a light guide plate, wherein the light guide plate is disposed on the light-incident surface of the light guide plate, and the light source is disposed in a direction of the light guide plate.
  • the length of the entrance surface is the same.
  • the embodiment of the present invention further provides a liquid crystal display device, including a display panel and a backlight module.
  • the backlight module uses the backlight module, and the display panel is disposed on a light emitting surface side of the light guide plate in the backlight module.
  • the light guide plate and the backlight module and the liquid crystal display device provided by the embodiment of the present invention, by providing a plurality of rows of corrugated protrusions having a triangular (vertical angle of arc) cross section on the light-emitting surface of the light guide plate,
  • the illuminating surface can converge at a large angle in the horizontal direction and at the ''''''''' The height and the viewing angle are better, and the occurrence of interference phenomenon is avoided, thereby improving the display quality of the liquid crystal display device.
  • FIG. 1 is a three-dimensional schematic view of a light guide plate in the prior art, on which a linear inverted V-shaped projection is arranged on the upper surface of the light guide plate;
  • Figure 2 is a schematic cross-sectional view of the light guide plate of Figure 1;
  • FIG. 3 is a three-dimensional schematic view of a light guide plate according to Embodiment 1 of the present invention, a first protrusion is arranged on a light-emitting surface of the light guide plate;
  • Figure 4 is a schematic cross-sectional view of the first projection of Figure 3;
  • FIG. 5 is a three-dimensional schematic view of a light guide plate according to Embodiment 2 of the present invention, on which a first protrusion and a second protrusion are disposed on a light-emitting surface of the light guide plate;
  • Figure 6 is a partial enlarged view of Figure 5;
  • Figure 7 is a three-dimensional view of a light guide plate according to Embodiment 3 of the present invention, on which a first protrusion and a diffusion particle are disposed on a light-emitting surface of the light guide plate;
  • Figure 8 is a partial enlarged view of Figure 7. detailed description
  • the longitudinal direction of the light-emitting surface is the extending direction of the corrugated first protrusion on the light surface as shown in FIG. 3, FIG. 5 or FIG. 7, and the horizontal direction of the light-emitting surface is light-emitting. A direction perpendicular to the direction in which the corrugated first protrusions extend.
  • the present embodiment provides a light guide plate, which may include a light guide plate body 1 and a light incident surface, a reflective surface, and a light exit surface on the light guide plate body 1, wherein the light exit surface is as shown in FIG.
  • the upper surface of the light guide plate shown is a lower surface of the light guide plate as shown in the drawing, and the light incident surface is a side surface of the light guide plate adjacent to both the light exit surface and the reflection surface.
  • the light source (not shown) of the backlight module may be disposed along a length extending direction of the light incident surface side of the light guide plate.
  • the light incident surface of the light guide plate may be a side of one side or two opposite sides.
  • a plurality of rows of first protrusions 3 parallel to each other may be disposed on the light-emitting surface, and each of the first protrusions 3 may be corrugated along the length thereof, and the cross-section of each column of protrusions may be a triangle, the apex angle of the triangle It is a curved corner, and therefore, the raised microstructure can be referred to as a corrugated inverted V-shaped projection.
  • the light incident surface of the light guide plate may be a side surface of the light guide plate including the cross section of the first protrusion 3, wherein the side where the light incident surface and the light exit surface of the light guide plate intersect may be a triangular cross section of the plurality of first protrusions 3
  • the W-shape formed by the two sides of the apex angle is the same as the light-incident surface of the light guide plate provided with the linear inverted V-shaped projection shown in FIG.
  • the first protrusion 3 may be formed integrally with the light guide plate by stamping or injection molding, or may be a convex structure separately formed on the light guide plate.
  • the first protrusions 3 can be distributed in a corrugated manner on the light-emitting surface so that a large angle of light can be concentrated in both the lateral direction and the longitudinal direction of the light-emitting surface. It has a higher brightness than the light emitted from the light panel and is equivalent to the light-emitting angle in the lateral and longitudinal directions of the light-emitting surface. Further, according to the distribution pattern of the first protrusions 3, since it is not simply distributed in the lateral or longitudinal direction of the light-emitting surface, it is substantially not close to the grain size inside the array substrate of the liquid crystal display device, so that interference can be avoided. The phenomenon of stripes.
  • the corrugations of the first protrusions 3 of each column may preferably be sinusoidal waveforms, and the ripples are regularly distributed in the sinusoidal waveform so that the light can be in the longitudinal direction of the light exiting surface (ie, the direction in which the sinusoidal waveform extends) and in the lateral direction (ie, the sinusoidal waveform).
  • the amplitude direction is evenly distributed, which can improve the light-emitting brightness of the light guide plate, and make the horizontal and vertical light-emitting angles on the light-emitting surface equivalent.
  • the sinusoidal waveform distribution mode is not a simple lateral or vertical distribution, it is substantially not close to the internal wiring size of the array substrate of the liquid crystal display device, so that the occurrence of interference can be avoided.
  • the amplitude and wavelength of the sinusoidal waveform can be determined according to the size range of the light guide plate application and the cross-sectional size of the first protrusion 3. In the case where the application size range of the light guide plate is large and the cross-sectional size of the first protrusion 3 is large, the amplitude and wavelength of the sinusoidal waveform can be relatively large, and vice versa.
  • Figure 4 is a cross-sectional view of the first projection 3 in the present embodiment.
  • the cross-sectional apex angle of the first protrusion 3 may be an arc angle rather than a sharp triangular apex angle. Since the optical film is required to be placed on the light guide plate, the curved corner structure can avoid scratching the optical film.
  • the angle ⁇ of the apex angle of the cross section may preferably be 90. ⁇ 120. Between the two bottom angles ⁇ and ⁇ may be equal or unequal. If the angle ⁇ of the apex angle is at 90. ⁇ 120.
  • the large-angle light can be effectively concentrated, so that the brightness of the backlight module applying the light guide plate can be effectively increased in the direction of the vertical light-emitting surface; if the angle is greater than 120. Or less than 90. , will reduce the ability to concentrate on large angles of light.
  • the angle ⁇ of the cross-sectional apex angle of the first protrusion 3 may be 90.
  • both bottom angles ⁇ and ⁇ can be 45. To achieve a large angle of light convergence Maximize.
  • a plurality of optical dots are disposed on the lower surface of the light guide plate as shown in FIG. 3, and the optical dots may be convex, Sag or other structure. Alternatively, the optical dots may be circular or polygonal projections.
  • the point light source or the line light source can be converted into a relatively uniform surface light source to be emitted from the light exit surface of the light guide plate, thereby increasing uniformity of light output and improving display quality. .
  • the light incident surface of the light guide plate may be a side surface of the light guide plate adjacent to both the reflective surface and the light exit surface, and the side surface may include a cross section of the plurality of first protrusions at the end, that is, the light incident surface and the light exit surface Intersecting a protrusion extending to the edge of the apex angle of the triangular cross section of the light incident surface of the light guide plate ⁇ :
  • the light incident surface of the light guide plate may be one side of the light guide plate, and a set of light sources may be correspondingly arranged, or two opposite sides may be opposite to each other, and two sets of light sources are correspondingly arranged.
  • the direction in which the W-shaped shape extends may be consistent with the direction in which the light source is disposed, and the arrangement of the W-shaped groove structure at the intersection of the light incident surface and the light exit surface of the light guide plate can diffuse light entering the light guide plate to avoid guiding A firefly phenomenon occurs in the light entrance of the light plate, that is, uneven brightness, light and dark.
  • the light guide plate has a light incident surface, a reflective surface and a light exit surface, and is suitable for a side-entry backlight module.
  • the light guide plate may be a diffusion plate, and the light incident surface and the light emitting surface opposite to the light incident surface are disposed on the body of the diffusing plate.
  • the lower surface of the diffusing plate is a light incident surface
  • the upper surface of the diffusing plate For the light-emitting surface, the first convex surface is arranged on the light-emitting surface of the diffusing plate according to the structure described above, and the optical mesh is arranged on the light-incident surface according to the above-described structure, and the light-emitting surface of the diffusing plate can also be concentrated in the horizontal and vertical directions. Large-angle light, the brightness of the light is higher, and the light-emitting surface has a similar viewing angle in the horizontal and vertical directions, avoiding the effect of interference.
  • the light guide plate of the embodiment is further improved on the basis of the light guide plate of the first embodiment.
  • the light guide plate of this embodiment includes the first protrusion 3 as described in Embodiment 1, and the light-emitting surface between each adjacent two columns of the first protrusions 3.
  • a plurality of second protrusions 4 arranged in parallel with the first protrusions 3 are provided.
  • the cross section of the second protrusion 4 may also be a triangle, the height of which may be smaller than the height of the first protrusion 3, and the angle of the apex angle of the cross section may also be set at 90. ⁇ 120. Between, C is chosen to be 90. .
  • the second protrusion 4 can Considering the reduced version of the first protrusion 3, the difference is that since the light guide plate supports the optical film through the first protrusion 3, the second protrusion 4 does not contact the optical film, so the cross section of the second protrusion 4 The apex angle does not need to be set to a curved corner.
  • the action of the first protrusions 3 can be further enhanced, and the light guide plates can also be concentrated at a large angle of light in both the lateral direction and the longitudinal direction of the light-emitting surface, and the light-emitting brightness is higher, and the light-emitting surface is horizontal and vertical.
  • the upper viewing angle is equivalent, and the occurrence of interference phenomenon is avoided, thereby improving the display quality of the liquid crystal display device.
  • the light guide plate of the embodiment is further improved on the basis of the light guide plate of the first embodiment.
  • the light guide plate of this embodiment may include the first protrusion 3 as described in Embodiment 1, and the light-emitting surface between each adjacent two columns of the first protrusions 3.
  • the convex diffusion particles 5 are uniformly distributed.
  • the height of the diffusion particles 5 may be smaller than the height of the first protrusions 3.
  • the diffusing particles 5 can have a function of scattering light to make the light more uniform.
  • the diffusion particles 5 may be arranged in a hemispherical shape to more uniformly diffuse light.
  • the diffusing particles can also be set to other shapes, such as polyhedrons, irregular strips, etc., or can be set as some microstructures.
  • the diffusion particles in this embodiment can also be used in combination with the first protrusion 3 described in the first embodiment and the second protrusion 4 described in the second embodiment, such as the first protrusion 3 and the second protrusion. Diffusion particles are provided between the four to maximize the light-emitting effect of the light guide plate.
  • an embodiment of the present invention further provides a backlight module including a light source and a light guide plate, and the light guide plate can be used with the light guide plate according to the above embodiment.
  • the backlight module can be preferably configured as a side-in type light source structure, and the light source can be disposed on the light-incident surface of the light guide plate, preferably using an LED light bar, wherein the arrangement direction of the LED light can be the length of the light-incident surface of the light guide plate. The direction is the same.
  • the backlight module of the embodiment can be configured as a direct-light source structure.
  • the upper surface of the light-guiding light guide plate is disposed on the light-incident surface side of the light guide plate, that is, under the light guide plate, and the light can be directly input. The light is emitted toward the light exit surface.
  • the light-emitting surface of the light guide plate is provided with a corrugated inverted V-shaped convex structure, the brightness of the light emitted from the back module can be improved, and the light-emitting surface can be horizontally and vertically. The upward viewing angle is comparable and the phenomenon of interference is avoided.
  • the embodiment of the present invention further provides a liquid crystal display device, including a display panel and a backlight module, wherein the backlight module uses the backlight module, and the brightness of the liquid crystal display device including the backlight module is improved, and the display quality is improved. It has also been improved.
  • the liquid crystal display device may be any product or component having a display function and requiring a backlight module, such as a liquid crystal television, a notebook computer, a tablet computer, a mobile phone, a digital photo frame, and an electronic paper.
  • the embodiment of the present invention provides a plurality of rows of corrugated protrusions having a triangular cross section (arc angle) on the light-emitting surface of the light guide plate, so that the light-emitting surface is horizontally and vertically. It can converge a large angle of light, and the brightness of the light is higher, and the light-emitting surface has a similar viewing angle in the horizontal and vertical directions; since the corrugated protrusion is not simply distributed laterally or longitudinally on the light-emitting surface, it is substantially not associated with the liquid crystal display device.
  • the size of the inside of the array substrate is close to each other, and the occurrence of interference phenomenon can be avoided, thereby improving the display quality of the liquid crystal display device.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

一种导光板、背光模组和液晶显示装置，导光板包括：导光板本体（1）和位于导光板本体上的出光面，出光面上设置有多列相互平行的第一凸起（3），每列第一凸起（3）沿其长度方向呈波纹状走向。通过在导光板出光面上设置多列波纹状的三角形（顶角为弧形）截面凸起，使得出光面的横向和纵向均能汇聚大角度光线，出光亮度更高、出光面横向和纵向出光视角相当；波纹状的三角形（顶角为弧形）截面凸起，很难与液晶显示装置的阵列基板内部纹路尺寸相接近，可避免干涉现象的出现，提高液晶显示装置的显示质量。

Description

导光板、 背光模组和液晶显示装置 技术领域
本发明的实施例涉及一种导光板、 背光模组和液晶显示装置。 背景技术
液晶显示器由于其具有体积小、 功耗低、 辐射低等特点而在当前的平板 显示器市场中占据了主导地位。 在液晶显示器中， 由于液晶本身并不发光， 其只对光线进行调控， 所以为了使液晶显示器的屏幕上显示图像， 需要为液 晶显示器中的显示面板（Panel )配置背光模组（BLU, Back Light Unit ) 。 背光模组的出光效果（亮度、 均匀性等）将会直接影响液晶显示器的视觉效 果。
背光模组可以根据光源设置位置的不同而分为直下式背光模组和侧入式 背光模组， 其中侧入式背光模组由于其更轻薄、 能耗更低而得到广泛关注。 侧入式背光模组通常包括光源、 导光板和光学膜片。 为提高背光模组的出光 亮度， 现有技术中的一种导光板的设计是在导光板的出光面上增加直线型的 倒 V字凸起。 如图 1所示， 导光板包括导光板本体 1、 入光面、 反射面和出 光面等， 导光板的出光面上设置有平行排列的直线型的倒 V字凸起 2。 如图 2所示， 直线型的倒 V字凸起 2沿其长度方向为直线延伸， 其横截面为三角 形， 即倒 V字， 通过倒 V字凸起的微结构设计， 能获得会聚光线、 增大出光 面垂直方向上的亮度的效果。 但是， 在实际应用过程中， 具有该结构的导光 板的亮度提高有限，并且由于直线型的倒 V字凸起微结构均沿着一个方向排 歹 ij , 使得出光面在横向和纵向上的出光视角不同， 而且还有可能产生干涉条 纹， 最终影响显示质量。 发明内容
本发明的实施例提供一种导光板， 能够提高导光板的出光亮度， 同时保 证导光板的出光面在横向和纵向上的出光视角相当， 并且能够避免产生干涉 条紋。 根据本发明实施例的一个方面， 提供一种导光板， 该导光板可以包括： 导光板本体和位于导光板本体上的出光面， 出光面上设置有多列相互平行的 第一凸起， 每列第一凸起沿其长度方向呈波纹状走向。
在实施例中， 第一凸起的横截面可以为三角形， 并且该三角形的顶角可 以为弧形角。
在实施例中， 第一凸起的横截面顶角的夹角可以为 90。〜120。。
在实施例中， 第一凸起的波纹状走向可以为正弦波形走向。
在实施例中， 导光板还可以包括： 多列与第一凸起平行的第二凸起， 设 置在每相邻两列第一凸起之间的出光面上， 第二凸起的高度可以小于第一凸 起的高度， 第二凸起的横截面可以为三角形， 第二凸起的横截面顶角的夹角 可以为 90。〜120。。
在实施例中， 导光板还可以包括： 扩散颗粒， 均匀地分布在每相邻两列 第一凸起之间的出光面上， 该扩散颗粒的高度小于第一凸起的高度。
在实施例中， 导光板还可以包括位于导光板本体上且与出光面相对的反 射面， 反射面上设置有多个光学网点， 光学网点的形状可以为圓形或多边形。
在实施例中， 导光板还可以包括位于导光板本体上与出光面和反射面均 该 W字型由多个第一凸起的三角形横截面的顶角的边形成。
本发明的实施例还提供了一种背光模组， 包括光源和导光板， 该导光板 釆用上述导光板， 光源设置在导光板的入光面一侧， 并且光源的布置方向与 导光板的入光面的长度方向一致。
本发明的实施例还提供一种液晶显示装置， 包括显示面板和背光模组， 该背光模组釆用上述背光模组， 显示面板设置于背光模组中的导光板的出光 面一侧。
根据本发明实施例提供的导光板以及具有该导光板的背光模组和液晶显 示装置， 通过在导光板出光面上设置多列具有三角形 （顶角为弧形）截面的 波纹状凸起， 使得出光面在横向和 '、向上均能会聚大角度光线， 出光亮度更 高、 视角更好， 同时避免干涉现象的出现， 从而提高液晶显示装置的显示质 量。
附图说明
图 1是现有技术中的导光板的三维示意图， 在该导光板的上表面上布置 有直线型倒 V字凸起；
图 2是图 1中的导光板的横截面示意图；
图 3是根据本发明实施例 1的导光板的三维示意图， 在该导光板的出光 面上布置第一凸起；
图 4是图 3中的第一凸起的横截面示意图；
图 5是根据本发明实施例 2的导光板的三维示意图， 在该导光板的出光 面上布置有第一凸起和第二凸起；
图 6是图 5的局部放大图；
图 7是根据本发明实施例 3的导光板的三维示意图， 在该导光板的出光 面上布置有第一凸起和扩散颗粒； 以及
图 8是图 7的局部放大图。 具体实施方式
下面结合附图和实施例， 对本发明的具体实施方式作进一步详细描述。 以下实施例用于说明本发明， 但不用来限制本发明的范围。
需要说明的是，本发明实施例中所述出光面的纵向为如图 3、 图 5或图 7 所示出光面上的波纹状第一凸起的延伸方向， 所述出光面的横向为出光面上 的与波纹状第一凸起的延伸方向垂直的方向。
实施例 1
如图 3所示， 本实施例提供了一种导光板， 该导光板可以包括导光板本 体 1以及位于导光板本体 1上的入光面、 反射面和出光面， 其中， 出光面为 如图所示的导光板的上表面， 反射面为如图所示的导光板的下表面， 入光面 是导光板的与出光面和反射面均相邻的侧面。背光模组的光源（图中未示出） 可以在导光板的入光面一侧沿其长度延伸方向设置。 导光板的入光面可以为 一侧的侧面， 也可以为相对的两个侧面。 在出光面上可以设置多列相互平行的第一凸起 3 , 每列第一凸起 3可以 沿其长度方向呈波纹状走向， 每列凸起的横截面可以为三角形， 该三角形的 顶角为弧形角， 因此， 可以将该凸起微结构称为波纹状倒 V字凸起。 导光板 的入光面可以是导光板的包括第一凸起 3的横截面的侧面， 其中导光板的入 光面和出光面相交的边可以为多个第一凸起 3的三角形横截面的顶角的两条 边形成的 W字型， 其与图 2所示的设置直线型倒 V字凸起的导光板的入光 面相同。第一凸起 3可以通过冲压或者注塑等方式而与导光板形成一体结构， 也可以为在导光板上单独形成的凸起结构。 第一凸起 3可以在出光面上呈波 纹状分布， 使得在出光面的横向和纵向上均可以会聚大角度光线。 与仅能在 光板的出光亮度更高并且在出光面的横向和纵向上出光视角相当。 此外， 根 据第一凸起 3的分布方式， 由于其不是单纯地在出光面的横向或纵向分布， 所以基本上不会与液晶显示装置的阵列基板内部的纹路尺寸相接近， 因此能 够避免产生干涉条纹的现象。
本实施例中， 每列第一凸起 3的波纹状可以优选为正弦波形， 正弦波形 中波纹分布规则， 使得光线能够在出光面的纵向 （即正弦波形延伸方向）和 横向 （即正弦波形的振幅方向）分布均匀， 可以提高导光板的出光亮度， 并 使出光面上横向和纵向的出光视角相当。 同时， 由于正弦波形分布方式不是 单纯的横向或者纵向的分布， 所以基本上不会与液晶显示装置的阵列基板内 部纹路尺寸相接近， 从而可以避免干涉现象的出现。 具体地， 该正弦波形的 振幅和波长可以根据导光板应用尺寸范围及第一凸起 3 的横截面尺寸来确 定。在导光板的应用尺寸范围较大、第一凸起 3的横截面尺寸较大的情况下， 正弦波形的振幅和波长可以相对较大， 反之则亦然。
图 4为本实施例中的第一凸起 3的截面图。 第一凸起 3的横截面顶角可 以为弧形角， 而并非尖锐的三角形顶角， 因为导光板上需要放置光学膜片， 弧形角的结构能够避免划伤光学膜片。 横截面顶角的夹角 α可以优选在 90。〜120。之间， 两底角 β和 γ可以相等， 也可以不等。 如果顶角的夹角 α在 90。〜120。的范围内， 则能够有效会聚大角度光线， 使应用该导光板的背光模 组在垂直出光面的方向上亮度能有效提高；如果该角度大于 120。或小于 90。， 则都会降低对大角度光线的会聚能力。 备选地， 第一凸起 3的横截面顶角的 夹角 α可以为 90。， 两底角 β、 γ可 ^都为 45。， 以实现大角度光线会聚程度 的最大化。
在本实施例的导光板中， 与出光面相对的反射面即如图 3所示的导光板 的下表面上设置有多个光学网点（图中未示出）， 光学网点可以为凸起、 凹陷 或者其他 结构。 备选地， 光学网点可以为圓形或多边形的凸起。 本实施例 通过光学网点与设置于导光板的底面的反射片相结合， 可以将点光源或线光 源转换为较均匀的面光源从导光板出光面出射， 从而增加出光的均匀性， 提 高显示质量。
导光板的入光面可以为导光板的与反射面和出光面均相邻的侧面， 并且 该侧面可以包括所述多列第一凸起在端部的横截面， 即入光面与出光面相交 一凸起延伸到导光板的入光面的三角形横截面的顶角的边^:
Figure imgf000007_0001
凹槽。 导光板的入光面可以为导光板的一个侧面， 对应设置一组光源， 也可 以为彼此相对的两个侧面，对应设置两组光源。所述 W字型延伸的方向可以 与光源布置方向一致，并且在导光板的入光面和出光面相交处的 W状凹槽结 构的设置， 能够对进入导光板的光线进行扩散， 避免在导光板的入光处产生 萤火虫现象， 即亮度不均、 明暗相间的现象。
上述导光板具有入光面、 反射面和出光面， 适用于侧入式背光模组。 对 于直下式背光模组， 导光板可以为扩散板， 在扩散板的本体上设置入光面以 及与入光面相对的出光面， 通常扩散板的下表面为入光面， 扩散板的上表面 为出光面， 扩散板的出光面上按照上述描述的结构设置第一凸起， 入光面上 按照上述的描述结构设置光学网点， 同样能达到扩散板的出光面在横向和纵 向上均能会聚大角度光线， 出光亮度更高、 出光面在横向和纵向上的出光视 角相当， 避免干涉现象的效果。
实施例 2
为了提高导光板对光线的会聚作用， 本实施例的导光板在实施例 1中的 导光板的基础上做了进一步改进。 具体地， 如图 5和图 6所示， 本实施例的 导光板包括如实施例 1所述的第一凸起 3、 以及在每相邻两列第一凸起 3之 间的出光面上设置的多列与第一凸起 3平行的第二凸起 4。 第二凸起 4的横 截面也可以为三角形， 其高度可以小于第一凸起 3的高度， 其横截面顶角的 夹角也可以设置在 90。〜120。之间， C选为 90。。 整体来看， 第二凸起 4可以 看作第一凸起 3的缩小版， 区别在于， 因为导光板通过第一凸起 3来支撑光 学膜片， 第二凸起 4与光学膜片不接触， 所以第二凸起 4的横截面顶角无需 设置为弧形角。 通过设置第二凸起 4, 能够进一步增强第一凸起 3的作用， 并同样能够使得导光板在出光面的横向和纵向上均会聚大角度光线， 出光亮 度更高、 出光面在横向和纵向上的出光视角相当， 避免干涉现象的出现， 从 而提高液晶显示装置的显示质量。
本实施例中其他结构和效果可以与实施例 1相同， 此处不再赞述。 实施例 3
为了提高导光板出光的均匀性， 本实施例的导光板在实施例 1中导光板 的基础上做了进一步改进。 具体地， 如图 7和图 8所示， 本实施例的导光板 可以包括如实施例 1所述的第一凸起 3、 以及在每相邻两列第一凸起 3之间 的出光面上均匀分布的凸起状的扩散颗粒 5。 扩散颗粒 5的高度可以小于第 一凸起 3的高度。 扩散颗粒 5可以具有散射光线的作用， 能够使出光更加均 匀。 备选地， 扩散颗粒 5可以设置为半球状， 对光线的扩散作用更加均匀。 扩散颗粒也可以设置为其他形状， 如多面体、 不规则条状等， 也可以设置为 一些微结构。 通过将第一凸起 3与扩散颗粒 5相结合， 可以在提高导光板的 亮度的同时兼顾出光均匀性。 当然本实施例中扩散颗粒还可以与实施例一中 所述的第一凸起 3和实施例二中所述的第二凸起 4同时配合使用， 如在第一 凸起 3和第二凸起 4之间设置扩散颗粒， 从而最大限度地改善导光板的出光 效果。
本实施例中其他结构和效果可以与实施例 1相同， 此处不再赞述。 实施例 4
结合上述实施例， 本发明实施例还提供了一种背光模组， 包括光源和导 光板， 导光板可以釆用根据上述实施例的导光板。 该背光模组可以优选设置 为侧入式光源结构， 光源可以设置在上述的导光板入光面一侧， 优选地使用 LED灯条， 其中 LED灯的布置方向可以与导光板入光面的长度方向一致。
当然， 也可以将本实施例背光模组设置为直下式光源结构， 此时， 导光 导光板的上表面， 光源设置在导光板的入光面一侧， 即导光板下方， 光线可 以直接由入光面向出光面出射。 同样地， 由于导光板出光面上设置有波纹状 倒 V字凸起结构， 所以能够提高背 ^模组出光的亮度、 使出光面在横向和纵 向上的出光视角相当以及避免干涉现象的出现。
本发明的实施例还提供了一种液晶显示装置，包括显示面板和背光模组， 该背光模组釆用上述的背光模组， 包括该背光模组的液晶显示装置出光亮度 得以提高， 显示质量也得以提高。
根据本发明实施例所述的液晶显示装置可以为液晶电视、 笔记本电脑、 平板电脑、 手机、 数码相框、 电子纸等任何具有显示功能并需要背光模组的 产品或部件。
由以上实施例可以看出， 本发明的实施例通过在导光板的出光面上设置 多列波纹状的截面为三角形 （顶角为弧形） 的凸起， 使得出光面在横向和纵 向上均能会聚大角度光线， 出光亮度更高、 出光面在横向和纵向上的出光视 角相当； 由于所述波纹状凸起不是单纯在出光面上横向或者纵向分布， 所以 基本上不会与液晶显示装置的阵列基板内部的纹路尺寸相接近， 可以避免干 涉现象的出现， 从而提高液晶显示装置的显示质量。
以上所述仅是本发明的优选实施方式， 应当指出， 对于本技术领域的普 通技术人员来说， 在不脱离本发明技术原理的前提下， 还可以做出若干改进 和替换， 这些改进和替换也应视为落在本发明的保护范围内。

Claims

权利要求书
1、 一种导光板， 包括： 导光板本体和位于所述导光板本体上的出光面， 所述出光面上设置有多列相互平行的第一凸起， 每列所述第一凸起沿其长度 方向呈波纹状走向。
2、 如权利要求 1所述的导光板， 其中所述第一凸起的横截面为三角形， 且所述三角形的顶角为弧形角。
3、如权利要求 2所述的导光板，其中所述第一凸起的横截面顶角的夹角 为 90。〜120。。
4、如权利要求 1-3中任一项所述的导光板， 其中所述第一凸起的波纹状 走向为正弦波形走向。
5、如权利要求 1-4中任一项所述的导光板，还包括多列与所述第一凸起 平行的第二凸起，所述第二凸起设置在每相邻两列第一凸起之间的出光面上， 所述第二凸起的高度小于所述第一凸起的高度， 所述第二凸起的横截面为三 角形， 所述第二凸起的横截面顶角的夹角为 90°〜120°。
6、 如权利要求 1-4中任一项所述的导光板， 还包括凸起状的扩散颗粒， 所述扩散颗粒在每相邻两列第一凸起之间的出光面上均匀地分布， 所述扩散 颗粒的高度小于所述第一凸起的高度。
7、如权利要求 1-6中任一项所述的导光板，还包括位于所述导光板本体 上且与所述出光面相对的反射面， 所述反射面上设置有多个光学网点， 所述 光学网点的形状为圓形或多边形。
8、如权利要求 1-7中任一项所述的导光板，还包括位于所述导光板本体 上与所述出光面和所述反射面均相邻的入光面， 所述入光面与所述出光面相 交的边为沿其长度方向延伸的 W字型， 所述 W字型由所述多个第一凸起延 伸到所述导光板的入光面的三角形横截面顶角的边形成。
9、 一种背光模组， 包括光源和导光板， 所述导光板釆用如权利要求 1-8 中任一项所述的导光板， 所述光源设置在所述导光板的入光面一侧， 并且所 述光源的布置方向与所述导光板的入光面的长度方向一致。
10、 一种液晶显示装置， 包括显示面板以及如权利要求 9所述的背光模 组， 所述显示面板设置于所述背光模组中的所述导光板的出光面一侧。
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