WO2017206203A1 - 背光模块及显示设备 - Google Patents

背光模块及显示设备 Download PDF

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Publication number
WO2017206203A1
WO2017206203A1 PCT/CN2016/086056 CN2016086056W WO2017206203A1 WO 2017206203 A1 WO2017206203 A1 WO 2017206203A1 CN 2016086056 W CN2016086056 W CN 2016086056W WO 2017206203 A1 WO2017206203 A1 WO 2017206203A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
backlight module
light guide
microstructures
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PCT/CN2016/086056
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English (en)
French (fr)
Inventor
翁巾婷
李岳衡
张嘉尹
Original Assignee
瑞仪光电(苏州)有限公司
瑞仪光电股份有限公司
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Application filed by 瑞仪光电(苏州)有限公司, 瑞仪光电股份有限公司 filed Critical 瑞仪光电(苏州)有限公司
Priority to US15/602,126 priority Critical patent/US10215904B2/en
Publication of WO2017206203A1 publication Critical patent/WO2017206203A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/02—Refractors for light sources of prismatic shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
    • F21V2200/20—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of a generally planar shape

Definitions

  • the invention relates to a light source module, in particular to an application on a backlight module and on a display device.
  • a plurality of light-emitting diodes are generally used as the point light source. After the light generated by the light-emitting diodes enters the light from the side of the light guide plate, the light can be emitted from the light-emitting surface of the light guide plate to form a planar light source.
  • the backlight module is usually used with a prism sheet. Therefore, after the light is emitted from the light guide plate, the light can be first passed through the prism sheet and then enter the display panel to emit light, thereby achieving the purpose of improving the brightness of the positive viewing angle.
  • the prior art uses an improved prism sheet whose prism structure is rotated by an angle (3 to 15) with respect to one side of the backlight module.
  • the light guide plate in the backlight module may have a problem of uneven brightness and brightness of the light emitted corresponding to the position between the two adjacent light-emitting diodes. This problem is generally called light and dark. Hot Spot phenomenon.
  • the prism structure rotating at an angle to the side of the backlight module may cause deflection of the bright and dark lines, thereby seriously affecting the light-emitting effect of the display device.
  • such an improved prism sheet cannot be matched with the current light guide plate structure design for solving bright and dark lines.
  • an object of the present invention is to provide a backlight module and a display device having a good light-emitting effect.
  • the backlight module includes a light guide plate, a light source, and a first prism sheet.
  • the light guide plate includes a body and a plurality of oblique microstructures.
  • the body has a light incident surface and at least one major surface is coupled to the light surface.
  • the main surface has a first area and a second area, and the first area is adjacent to the light incident surface than the second area.
  • the oblique microstructures are disposed in the first region, wherein each of the oblique microstructures has a first slope.
  • the light source is adjacent to the light incident surface of the light guide plate.
  • the first prism sheet is disposed in front of the light guide plate, wherein the first prism sheet has a plurality of first prism microstructures, and each of the first prism microstructures has a second slope. Wherein one of the first slope and the second slope is a positive value, and the other of the first slope and the second slope is a negative value.
  • the body has an axis perpendicular to the light incident surface.
  • Each of the oblique microstructures extends along a first direction of extension, wherein the first direction of extension has a first angle with the axis.
  • Each of the first prism microstructures extends along a second direction of extension, wherein the second direction of extension has a second angle with the axis. The sum of the second angle and the first angle is about 90 degrees.
  • the first zone and the second zone are arranged along an axis.
  • the backlight module further includes a second prism sheet, and the second prism sheet is disposed between the first prism sheet and the light guide plate.
  • the second prism sheet has a plurality of second prism microstructures, and the extending direction of each of the second prism microstructures is not perpendicular to the light incident surface.
  • the light guide plate further includes a plurality of strip-shaped microstructures disposed on the second region of the main surface.
  • the main surface is a light-emitting surface.
  • the extending direction of each of the strip-shaped microstructures is perpendicular to the light-incident surface.
  • the light guide plate further includes a plurality of dot-shaped microstructures disposed on the second region of the main surface.
  • the main surface is a reflecting surface.
  • the main body includes a tapered portion and a flat portion.
  • the tapered portion has opposite first and second ends, wherein the thickness of the first end is greater than the thickness of the second end.
  • the flat portion is coupled to the second end of the tapered portion, wherein the thickness of the flat portion is equal to the thickness of the second end.
  • the main surface is located on the flat plate portion.
  • a display device is further proposed.
  • the display device includes the aforementioned backlight module and a display panel.
  • the display panel is located in front of the first prism sheet.
  • the present invention provides an oblique microstructure and a first prism structure which are matched to each other on the light guide plate and the first prism sheet.
  • the first prism microstructure on the first prism sheet can guide the light emitted from the oblique microstructure to ensure the light is vertically from the light.
  • the first prism sheet is emitted, thereby improving the light-emitting effect of the backlight module and the display device.
  • the first prism sheet of the present invention can also be combined with the light guide plate structure currently used to solve the bright and dark lines to achieve the same purpose.
  • FIG. 1 is a partial schematic view showing a backlight module according to a first embodiment of the present invention
  • FIG. 2A is a top view showing a light guide plate according to a first embodiment of the present invention.
  • FIG. 2B is a top view showing a first prism sheet according to a first embodiment of the present invention.
  • FIG. 3 is a top view showing a light guide plate according to a second embodiment of the present invention.
  • FIG. 4 is a partial perspective view showing a light guide plate according to a third embodiment of the present invention.
  • FIG. 5 is a partial schematic view showing a display device according to an embodiment of the present invention.
  • the backlight module 100 of the present embodiment mainly includes a light guide plate 200, a light source 300, a first prism sheet 400, and a second prism sheet 500.
  • the light source 300 is disposed adjacent to the light guide plate 200 and can generate light and enter the light guide plate 200.
  • the light source 300 includes a circuit board 320 and a plurality of light emitting diodes 340 disposed on the circuit board 320. The light emitting diodes 340 are electrically connected to the circuit board 320. As shown in FIG.
  • the light guide plate 200 includes a main body 220 and a plurality of oblique microstructures 240 disposed on the main body 220 .
  • the oblique microstructure 240 can effectively atomize the light between the two adjacent LEDs 340 and the light guide plate 200 near the light entering the light, and the light of the light guide plate 200 near the light entering the light can be mixed, thereby enabling the backlight.
  • Module 100 emits light more evenly.
  • FIG. 2A is a top view showing a light guide plate according to a first embodiment of the present invention.
  • the body 220 includes a light incident surface 221 and at least one major surface. In this embodiment, there are two main surfaces, one of which is the light exit surface 223 and the other main surface is the reflective surface 225.
  • the reflecting surface 225 and the light emitting surface 223 are respectively connected to opposite sides of the light incident surface 221 .
  • the oblique microstructures 240 are disposed on the light exit surface 223. As shown in FIG.
  • the main body 220 of the light guide plate 200 has an axis A1, and the extending direction of the axis A1 is perpendicular to the extending direction of the light incident surface 221 and the extending direction of the light source 300.
  • the light exit surface 223 includes a first area 223a and a second area 223b.
  • the first region 223a and the second region 223b are arranged along the axis A1.
  • the first area 223a is adjacent to the light incident surface 221, and the second area 223b is away from the light incident surface 221 than the first area 223a.
  • the first area 223a refers to a non-display area (Non Display Area) that the backlight module 100 is covered by the outer cover after being assembled with the outer cover.
  • the second area 223b means that the backlight module 100 is not covered by the outer cover after being assembled with the outer cover, and can be used by the user. View the active area (Active Area).
  • the oblique microstructures 240 are disposed in the first region 223a. Each of the oblique microstructures 240 is inclined with respect to the axis A1 and has a first slope.
  • FIG. 2B is a top view showing a first prism sheet according to the first embodiment of the present invention.
  • the first prism sheet 400 is adjacent to the light exit surface 223 of the light guide plate 200.
  • the first prism sheet 400 has a plurality of first prism microstructures 410.
  • Each of the first prism microstructures 410 is a strip-like structure, and each of the first prism microstructures 410 is inclined with respect to the axis A1 and has a second slope.
  • one of the second slope of the first prism microstructure 410 and the first slope of the oblique microstructure 240 is a positive value and the other is a negative value. That is, the oblique direction of the first prism microstructures 410 of the first prism sheet 400 is opposite to the oblique direction of the oblique microstructures 240 of the light guide plate 200.
  • the oblique microstructure 240 of the light guide plate 200 extends along the first extending direction D1 , and the first extending direction D1 and the axis A1 have the first clip. Angle ⁇ 1. Further, the first prism microstructure 410 of the first prism sheet 400 extends along the second extending direction D2, and the second extending direction D2 has a second angle ⁇ 2 with the axis A1. In the present embodiment, the total contract of the first angle ⁇ 1 and the second angle ⁇ 2 is equal to 90 degrees.
  • the diagonal microstructure 240 is represented by the axis A1.
  • the forward deflection is 30 degrees and the first prism microstructure 410 is reversed by 60 degrees with respect to the axis A1.
  • the second prism sheet 500 is disposed between the light guide plate 200 and the first prism sheet 400.
  • the second prism sheet 500 has a plurality of second prism microstructures 510, and the extending directions of the second prism microstructures 510 are skewed with respect to the axis A1. That is, the extending directions of the second prism microstructures 510 are not perpendicular to the extending direction of the light incident surface 221 of the main body 220.
  • the light generated by the light source 300 passes through the second prism sheet 500 and the first prism sheet 400 after entering the light guide plate 200 and passing through the oblique microstructure 240, thereby ensuring that the light is vertically from the first
  • the prism sheet 400 is emitted.
  • the oblique microstructure 240 disposed on the main body 220 of the light guide plate 200 can adjust the light emission direction of the light emitted from the oblique microstructure 240 in addition to the light between the two adjacent light-emitting diodes 340.
  • the first prism microstructure 410 can further correct the light emitted from the oblique structure 240, thereby causing the light to be vertically from the first prism sheet 400. Shoot out.
  • the light guide plate 200 further includes a plurality of strip-shaped microstructures 260 disposed in the second region 223 b of the light-emitting surface 223 .
  • the strip-shaped microstructures 260 extend perpendicularly to the light-incident surface 221, whereby the brightness of the entire light-guide plate 200 and the uniformity of light emission can be improved by the strip-shaped microstructures 260.
  • the light guide plate may have different structural designs.
  • FIG 3 there is shown a top view of a light guide plate in accordance with a second embodiment of the present invention.
  • the light guide plate 600 of the present embodiment also includes a main body 620 and a plurality of oblique microstructures 640 disposed on the main body 620.
  • the body 620 includes a light incident surface 621 and at least one major surface.
  • the reflecting surface 623 and the light emitting surface are respectively connected to opposite sides of the light incident surface 621.
  • the oblique microstructures 640 are disposed on the reflective surface 623.
  • the light guide plate 600 of the present embodiment can directly replace the light guide plate 200 as shown in FIG. 1 .
  • the oblique microstructure 640 of the light guide plate 600 is designed in the same manner as the oblique microstructure 240 of the light guide plate 200 to achieve the purpose of matching with the first prism microstructure 410 on the first prism sheet 400. This will not be repeated here.
  • the light guide plate 600 further includes a plurality of dot microstructures 660. These punctiform microstructures 660 are located in regions of the reflective surface 623 where the oblique microstructures 640 are not disposed. Thereby, the light-emitting luminance and the uniformity of light emission of the entire light guide plate 600 can be increased by the dot-shaped microstructures 660.
  • the light guide plate of the present invention is not limited to a flat plate design. In other embodiments, the light guide plate may also be a wedge-shaped light guide plate.
  • FIG. 4 there is shown a partial perspective view of a light guide plate in accordance with a third embodiment of the present invention.
  • the light guide plate 700 includes a body 720 and a plurality of oblique microstructures 740.
  • the main body 720 includes a flat plate portion 720a and a tapered portion 720b that connects the flat plate portion 720a.
  • the main body 720 has a light incident surface 721 and a main surface 723, wherein the light incident surface 721 is located on the side of the tapered portion 720b, and the main surface 723 is located on the flat plate portion 720a.
  • the major surface 723 can be a light exiting surface and the oblique microstructures 740 can be disposed on the major surface 723.
  • the oblique microstructure 740 can also be disposed at the same location of the tapered portion 720b and the flat portion 720a as needed. More specifically, the light guide plate 700 of the present embodiment can directly replace the light guide plate 200 as shown in FIG. 1 .
  • the oblique microstructure 740 of the light guide plate 700 is designed in the same manner as the oblique microstructure 240 of the light guide plate 200 to achieve the purpose of matching with the first prism microstructure 410 on the first prism sheet 400. This will not be repeated here.
  • the display device 800 of the present embodiment includes a backlight module 100 and a display panel 810 as shown in FIG.
  • the display panel 810 is disposed on the light-emitting side of the light guide plate 200 of the backlight module 100 , and the light emitted through the light guide plate 200 can be incident on the display panel 810 , and the same purpose as described above can be achieved. No longer.
  • the embodiment of the present invention is applied to the display device 800 with the backlight module 100 having the light guide plate 200 shown in FIG. 1 for illustrative purposes only, and is not intended to limit the present invention.
  • the backlight module of the other embodiments described above, for example, a backlight module having the light guide plate 600 or 700 can also be applied to a display device to produce the same effect.
  • the present invention provides an oblique microstructure and a first prism structure that can be matched to each other on the light guide plate and the first prism sheet.
  • the first prism microstructure on the first prism sheet can guide the light emitted from the oblique microstructure to Ensure that the light is emitted perpendicularly from the first prism sheet, thereby improving the light output of the backlight module and the display device.
  • the first prism sheet of the present invention can also be combined with the light guide plate structure currently used to solve the bright and dark lines to achieve the same purpose.

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

Abstract

一种背光模块（100）及显示设备（800）。背光模块（100）包括导光板（200）、光源（300）以及第一棱镜片（400）。导光板（200）包括主体（220）以及复数个斜向微结构（240）。主体（220）具有入光面（221）以及连接入光面（221）的至少一个主表面。主表面具有第一区（223a）以及第二区（223b），且第一区（223a）较第二区（223b）邻近入光面（221）。斜向微结构（240）设置在第一区（223a），其中，每一个斜向微结构（240）具有第一斜率。光源（300）邻设于导光板（200）的入光面（221）。第一棱镜片（400）设置在导光板（200）的前方。第一棱镜片（400）具有复数个第一棱镜微结构（410），且每一个第一棱镜微结构（410）具有第二斜率。第一斜率与第二斜率的其中一者为正值，第一斜率与第二斜率的另一者为负值。

Description

背光模块及显示设备 技术领域
本发明涉及一种光源模块，具体地涉及一种在背光模块上及其在显示设备上的应用。
背景技术
背光模块中通常会使用数个发光二极管作为点状光源，这些发光二极管所产生的光线从导光板的侧边入光后，可从导光板的出光面射出而形成面状光源。当背光模块运用在显示设备时，通常会搭配棱镜片使用。因此，光线从导光板出光后可先通过棱镜片再进入显示面板而出光，进而达到提高正视角亮度的目的。然而，由于棱镜片的棱镜结构尺寸与显示面板的像素单元的尺寸较为接近，加上棱镜结构的排列方向与背光模块的一个侧边平行，故容易产生干涉现象(moire)而影响显示设备的显示效果。因此，为了防止干涉现象发生，现有技术是使用一种改良的棱镜片，其棱镜结构相对背光模块的一个侧边旋转一角度(3°～15°)。
然而，由于每一个发光二极管的光场角度有限，故会导致背光模块中的导光板对应两相邻发光二极管之间的位置出现暗带与出光亮度不均匀的问题，此问题一般称为亮暗纹(Hot Spot)现象。当背光模块使用此种改良的棱镜片时，相对背光模块侧边旋转一角度的棱镜结构会导致亮暗纹现象产生偏斜，进而严重影响显示设备的出光效果。而且，此种具有改良的棱镜片也无法搭配目前用于解决亮暗纹的导光板结构设计。
发明内容
因此，本发明目的是提供一种具有良好的出光效果的背光模块及显示设备。
根据本发明上述目的，提出一种背光模块。此背光模块包括导光板、光源以及第一棱镜片。导光板包括主体以及复数个斜向微结构。主体具有入光面以及至少一个主表面连接入光面。其中，主表面具有第一区以及第二区，且第一区较第二区邻近入光面。斜向微结构设置在第一区，其中每一个斜向微结构具有第一斜率。光源邻设于导光板的入光面。第一棱镜片设置在导光板的前方，其中第一棱镜片具有复数个第一棱镜微结构，且每一个第一棱镜微结构具有第二斜率。其中，第一斜率与第二斜率的其中一者为正值，第一斜率与第二斜率的另一者为负值。
根据本发明实施例，上述主体具有垂直于入光面的轴线。每一个斜向微结构沿着第一延伸方向延伸，其中第一延伸方向与轴线之间具有第一夹角。每一个第一棱镜微结构沿着第二延伸方向延伸，其中，第二延伸方向与轴线之间具有第二夹角。第二夹角与第一夹角的总和约为90度。
根据本发明另一实施例，上述第一区与第二区沿着轴线排列。
根据本发明又一实施例，上述背光模块还包括第二棱镜片，且第二棱镜片设置于第一棱镜片与导光板之间。其中，第二棱镜片具有复数个第二棱镜微结构，且每一个第二棱镜微结构的延伸方向不垂直于入光面。
根据本发明再一实施例，上述导光板还包括复数个条状微结构，设置在主表面的第二区。其中，主表面为出光面。
根据本发明再一实施例，上述每一个条状微结构的延伸方向垂直于入光面。
根据本发明再一实施例，上述导光板还包括复数个点状微结构，设置在主表面的第二区。其中，主表面为反射面。
根据本发明再一实施例，上述主体包括渐缩部与平板部。渐缩部具有相对的第一端与第二端，其中第一端的厚度大于第二端的厚度。平板部连接于渐缩部的第二端，其中平板部的厚度等于第二端的厚度。
根据本发明再一实施例，上述主表面位于平板部上。
根据本发明上述目的，另提出一种显示设备。该显示设备包括前述背光模块以及显示面板。显示面板位于第一棱镜片的前方。
由上述可知，本发明在导光板与第一棱镜片上设置可互相搭配的斜向微结构与第一棱镜结构。藉此，从导光板的斜向微结构出光的光线而进入第一棱镜片后，第一棱镜片上的第一棱镜微结构可导正从斜向微结构射出的光线，以确保光线垂直地从第一棱镜片射出，进而提升背光模块及显示设备的出光效果。另一方面，本发明的第一棱镜片亦可搭配目前用于解决亮暗纹的导光板结构设计，以达到相同的目的。
附图说明
为了更完整了解实施例及其优点，现参照结合附图所做的下列描述，其中：
图1是示出根据本发明第一实施方式的一种背光模块的局部示意图；
图2A是示出根据本发明第一实施方式的一种导光板的上视图；
图2B是示出根据本发明第一实施方式的一种第一棱镜片的上视图；
图3是示出根据本发明第二实施方式的一种导光板的上视图；
图4是示出根据本发明第三实施方式的一种导光板的局部立体示意图；以及
图5是示出根据本发明实施方式的一种显示设备的局部示意图。
具体实施方式
参照图1，其是示出根据本发明第一实施方式的一种背光模块的局部示意图。本实施方式的背光模块100主要包括导光板200、光源300、第一棱镜片400以及第二棱镜片500。光源300邻设于导光板200，并可产生光线而射入导光板200中。光源300包括电路板320以及复数个发光二极管340设置在电路板320上，其中这些发光二极管340与电路板320电性连接。如图1所示，导光板200包括主体220以及设置在主体220上的复数个斜向微结构240。藉此，通过斜向微结构240可有效雾化两相邻的发光二极管340之间以及导光板200靠近入光处的光线，而可混合导光板200靠近入光处的光线，进而可使背光模块100出光更均匀。
一并参照图1和图2A，其中图2A是示出根据本发明第一实施方式的一种导光板的上视图。主体220包括入光面221及至少一个主表面。在本实施例中，主表面有两个，其中的一个主表面为出光面223，另一个主表面则为反射面225。反射面225与出光面223分别连接于入光面221的相对两侧。在本实施例中，斜向微结构240设置在出光面223上。如图2A所示，导光板200的主体220具有轴线A1，且此轴线A1的延伸方向垂直于入光面221的延伸方向与光源300的延伸方向。其中，出光面223包括有第一区223a及第二区223b。在本实施例中，第一区223a与第二区223b沿着轴线A1排列。第一区223a靠近入光面221，第二区223b较第一区223a远离入光面221。在本实施例中，第一区223a是指背光模块100在与外盖组装后，会被外盖所遮蔽的无效区(Non Display Area)。第二区223b则是指背光模块100与外盖组装后，不会被外盖所遮蔽，且可被使用者 观看到的有效区(Active Area)。在本实施例中，斜向微结构240设置在第一区223a中。每一个斜向微结构240相对轴线A1倾斜，且具有第一斜率。
一并参照图1和图2B，其中图2B是示出根据本发明第一实施方式的一种第一棱镜片的上视图。在本实施例中，第一棱镜片400邻设于导光板200的出光面223。第一棱镜片400具有复数个第一棱镜微结构410。每一个第一棱镜微结构410为条状结构，且每一个第一棱镜微结构410相对轴线A1倾斜，且具有第二斜率。在本实施例中，第一棱镜微结构410的第二斜率与斜向微结构240的第一斜率的其中一者为正值，另一者则为负值。也就是说，第一棱镜片400的第一棱镜微结构410的倾斜方向与导光板200的斜向微结构240的倾斜方向相反。
同时参照图1、图2A及2B，在本实施例中，导光板200的斜向微结构240沿着第一延伸方向D1延伸，且此第一延伸方向D1与轴线A1之间具有第一夹角θ1。此外，第一棱镜片400的第一棱镜微结构410沿着第二延伸方向D2延伸，且此第二延伸方向D2与轴线A1之间具有第二夹角θ2。在本实施例中，第一夹角θ1与第二夹角θ2的总合约等于90度。在示范例子中，当第一斜率为正值、第一夹角θ1为30度，且第二斜率为负值、第二夹角θ2则为60度时，代表斜向微结构240相对轴线A1正向偏斜30度，且第一棱镜微结构410相对轴线A1反向偏斜60度。
继续参照图1，第二棱镜片500设置在导光板200以及第一棱镜片400之间。第二棱镜片500具有复数个第二棱镜微结构510，且这些第二棱镜微结构510的延伸方向相对轴线A1偏斜。也就是说，这些第二棱镜微结构510的延伸方向不与主体220的入光面221的延伸方向垂直。藉此，光源300所产生的光线在进入导光板200并通过斜向微结构240而出光后，会依序经过第二棱镜片500及第一棱镜片400，而可确保光线垂直地从第一棱镜片400射出。更具体而言，若导光板没有设置斜向微结 构240的话，从导光板射出的光线在通过具有第一棱镜微结构410的棱镜片400后，将使得导光板的入光侧所产生的亮暗纹现象产生歪斜而超出有效区。因此，设置在导光板200的主体220上的斜向微结构240除了可混合两相邻的发光二极管340之间的光线外，亦可调整从斜向微结构240出光的光线射出方向。藉此，光线从斜向微结构240出光而进入第一棱镜微结构410后，第一棱镜微结构410可进一步校正从斜向结构240射出的光线，进而使光线从第一棱镜片400垂直地射出。
继续参照图1及图2A，在本实施例中，导光板200还包括复数个条状微结构260设置在出光面223的第二区223b中。较佳地，这些条状微结构260的延伸方向垂直于入光面221，藉此，通过条状微结构260可提升整体导光板200的亮度以及出光均齐度。
本发明中，导光板亦可有不同的结构设计。参照图3，其是示出根据本发明第二实施方式的一种导光板的上视图。本实施方式的导光板600同样包括主体620以及设置在主体620上的复数个斜向微结构640。主体620包括入光面621及至少一个主表面。在本实施例中，主表面有两个，其中的一个主表面为反射面623，另一个主表面则为出光面。反射面623与出光面分别连接于入光面621的相对两侧。在本实施例中，斜向微结构640设置在反射面623上。更具体而言，本实施方式的导光板600可直接取代如图1所示的导光板200。此外，导光板600的斜向微结构640的设计方式与前述导光板200的斜向微结构240相同，以达到与第一棱镜片400上的第一棱镜微结构410互相搭配的目的，故于此不再赘述。
继续参照图3，在本实施例中，导光板600还包括复数个点状微结构660。这些点状微结构660位于反射面623未设置斜向微结构640的区域。藉此，通过点状微结构660可增加整体导光板600的出光辉度以及出光均匀度。
更具体而言，本发明的导光板并不限于平板式设计。在其他实施例中，导光板亦可为楔形导光板。参照图4，其是示出根据本发明的第三实施方式的一种导光板的局部立体示意图。如图4所示，导光板700包括主体720以及复数个斜向微结构740。在本实施例中，主体720包括平板部720a以及连接平板部720a的渐缩部720b。主体720具有入光面721以及主表面723，其中入光面721位于渐缩部720b的侧面，主表面723是位于平板部720a上。在本实施例中，主表面723可为出光面，且斜向微结构740设置在主表面723上。在其他实施例中，斜向微结构740亦可根据需求而同时设置在渐缩部720b与平板部720a的位置。更具体而言，本实施方式的导光板700可直接取代如图1所示的导光板200。此外，导光板700的斜向微结构740的设计方式与前述导光板200的斜向微结构240相同，以达到与第一棱镜片400上的第一棱镜微结构410互相搭配的目的，故于此不再赘述。
另参照图5，其是示出根据本发明实施方式的一种显示设备的局部示意图。本实施方式的显示设备800包括如图1所示的背光模块100以及显示面板810。如图5所示，显示面板810设置在背光模块100的导光板200的出光侧，且经由导光板200出光的光线可射入显示面板810中，并可达到与前述相同的目的，故在此不再赘述。更具体而言，本案实施例以图1所示的具有导光板200的背光模块100应用于显示设备800中仅用来作为示范说明用，并非用以限制本发明。前述其他实施例的背光模块，例如具有导光板600或700的背光模块亦可应用于显示设备中，以产生同样的效果。
由上述本发明实施方式可知，本发明在导光板与第一棱镜片上设置可互相搭配的斜向微结构与第一棱镜结构。藉此，从导光板的斜向微结构出光的光线而进入第一棱镜片后，第一棱镜片上的第一棱镜微结构可导正从斜向微结构射出的光线，以 确保光线垂直地从第一棱镜片射出，进而提升背光模块及显示设备的出光效果。另一方面，本发明的第一棱镜片亦可搭配目前用于解决亮暗纹的导光板结构设计，以达到相同的目的。
虽然本发明已以实施例揭露如上，然其并非用以限定本发明，任何所属技术领域中技术人员在不脱离本发明的精神和范围内，当可作些许的更动与润饰，故本发明的保护范围当以权利要求所界定者为准。
符号说明
100              背光模块
200              导光板
220              主体
221              入光面
223              出光面
223a             第一区
223b             第二区
225              反射面
240              斜向微结构
260              条状微结构
300              光源
320              电路板
340              发光二极管
400              第一棱镜片
410              第一棱镜微结构
500              第二棱镜片
510              第二棱镜微结构
600              导光板
620              主体
621              入光面
623              反射面
640              斜向微结构
660              点状微结构
700              导光板
720              主体
720a             平板部
720b             渐缩部
721              入光面
723              主表面
740              斜向微结构
800              显示设备
810              显示面板
A1               轴线
D1               第一延伸方向
D2               第二延伸方向
θ1              第一夹角
θ2              第二夹角

Claims (10)

  1. 一种背光模块，所述背光模块包括：
    导光板，包括︰
    主体，具有入光面以及连接所述入光面的至少一个主表面，其中，所述至少一个主表面具有第一区以及第二区，且所述第一区较所述第二区邻近所述入光面；以及
    复数个斜向微结构，设置在所述第一区，其中，每一所述斜向微结构具有第一斜率；
    光源，邻设于所述导光板的所述入光面；以及
    第一棱镜片，设置在所述导光板的前方，其中，所述第一棱镜片具有复数个第一棱镜微结构，其中，每一个所述第一棱镜微结构具有第二斜率；
    其中，所述第一斜率与所述第二斜率的其中一者为正值，另一者为负值。
  2. 根据权利要求1所述的背光模块，其中
    所述主体具有垂直于所述入光面的轴线；
    每一个所述斜向微结构沿着第一延伸方向延伸，其中，所述第一延伸方向与所述轴线之间具有第一夹角；以及
    每一个所述第一棱镜微结构沿着第二延伸方向延伸，其中，所述第二延伸方向与所述轴线之间具有第二夹角；
    其中，所述第二夹角与所述第一夹角的总和约为90度。
  3. 根据权利要求1或2所述的背光模块，其中，所述第一区与所述第二区沿着所述轴线排列。
  4. 根据权利要求1至3中任一项所述的背光模块，还包括第二棱镜片，其设置在所述第一棱镜片与所述导光板之间，其中，所述第二棱镜片具有复数个第二棱镜微结构，且每一个所述第二棱镜微结构的延伸方向不垂直于所述入光面。
  5. 根据权利要求1至4中任一项所述的背光模块，其中
    所述导光板还包括复数个条状微结构，其设置在所述至少一个主表面的所述第二区；以及
    所述至少一个主表面为出光面。
  6. 根据权利要求5所述的背光模块，其中，每一个所述条状微结构的延伸方向垂直于所述入光面。
  7. 根据权利要求1至4中任一项所述的背光模块，其中
    所述导光板还包括复数个点状微结构，其设置在所述至少一个主表面的所述第二区；以及
    所述至少一个主表面为反射面。
  8. 根据权利要求1至7中任一项所述的背光模块，其中，所述主体包括：
    渐缩部，具有相对的第一端和第二端，其中，所述第一端的厚度大于所述第二端的厚度；以及
    平板部，连接于所述渐缩部的所述第二端，其中，所述平板部的厚度等于所述第二端的厚度。
  9. 根据权利要求8所述的背光模块，其中，所述至少一个主表面位于所述平板部上。
  10. 一种显示设备，包括：
    根据权利要求1至9中任一项所述的背光模块；以及
    显示面板，其位于所述第一棱镜片的前方。
PCT/CN2016/086056 2016-05-31 2016-06-16 背光模块及显示设备 WO2017206203A1 (zh)

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