WO2017128530A1 - 棱镜片、背光模组及显示设备 - Google Patents

棱镜片、背光模组及显示设备 Download PDF

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Publication number
WO2017128530A1
WO2017128530A1 PCT/CN2016/079644 CN2016079644W WO2017128530A1 WO 2017128530 A1 WO2017128530 A1 WO 2017128530A1 CN 2016079644 W CN2016079644 W CN 2016079644W WO 2017128530 A1 WO2017128530 A1 WO 2017128530A1
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WIPO (PCT)
Prior art keywords
prism sheet
light
microstructures
reference line
backlight module
Prior art date
Application number
PCT/CN2016/079644
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English (en)
French (fr)
Inventor
戴永辉
陈蔚轩
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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Publication of WO2017128530A1 publication Critical patent/WO2017128530A1/zh
Priority to US15/671,818 priority Critical patent/US10209410B2/en

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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
    • 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
    • F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
    • 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
    • G02B5/0205—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
    • G02B5/0231—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 microprismatic or micropyramidal shape
    • 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
    • G02B5/0263—Diffusing elements; Afocal elements characterised by the diffusing properties with positional variation of the diffusing properties, e.g. gradient or patterned diffuser
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • 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
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface 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
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the invention relates to an optical device, in particular to a prism sheet, a backlight module and a display device.
  • a known backlight module 1 includes a light source 11 , a light guide plate 12 for guiding light emitted by the light source 11 , and a first diffusion sheet 13 disposed in front of the light guide plate 12 .
  • the first prism sheet 14 is formed on the surface at equal intervals from each other and perpendicular to the incident direction of the light.
  • the backlight module 1 further includes a second prism sheet 16 disposed between the first prism sheet 14 and the second diffusion sheet 15 .
  • the second prism sheet 16 has a plurality of second microstructures 161 formed on the surface at equal intervals from each other and extending in a direction parallel to the incident direction of the light.
  • the viewing angle is increased in the direction perpendicular to and parallel to the incident direction of the light, the luminance is improved, but when the display is made, the viewing angle is also changed. Small problems, thus affecting the display of the display.
  • the prism sheet of the present invention comprises a body having a light-emitting surface, and a plurality of microstructures formed on the light-emitting surface of the body spaced apart from each other and extending in the same direction.
  • the light exiting surface has a plurality of flat regions formed between each two adjacent microstructures.
  • a reference line is defined parallel to the direction of extension of the microstructure, the width of the flat region being gradually widened in a direction away from the reference line.
  • the prism sheet of the present invention comprises a body having a light-emitting surface, and a plurality of microstructures formed on the light-emitting surface of the body spaced apart from each other and extending in the same direction.
  • a reference line is defined parallel to the direction of extension of the microstructure, the arrangement density of the microstructure being tapered toward a direction away from the reference line.
  • the arrangement density of the microstructure of the prism sheet of the present invention is gradually dispersed toward a direction away from the reference line, that is, the microstructure is densely distributed in a range close to the reference line, and can be effectively Converging light to increase central brightness.
  • the width of the flat region is gradually widened in a direction away from the reference line, and the viewing angle can be effectively increased in the range closer to the two sides, so that both the front view luminance and the left and right sides of the screen can be realized simultaneously.
  • the effect of the side angle of view is not limited to the side angle of view.
  • Another object of the present invention is to provide a backlight module and a display device capable of simultaneously taking into account both the front view luminance and the viewing angle of the screen.
  • the backlight module of the present invention comprises a light source, a light guide plate for guiding light emitted by the light source, and a prism sheet of the present invention as described above.
  • the display device of the present invention comprises a display panel, and the backlight module of the present invention as described above, wherein the display panel is located in front of the prism sheet.
  • the prism sheet of the present invention can achieve the effect of simultaneously taking into consideration the central elevation and the viewing angle of the screen, so that the backlight module of the present invention can provide a light source with both central brightness and viewing angle, and the invention made by the backlight module Therefore, it is possible to provide a display effect that takes into consideration both the front view luminance and the viewing angle of the screen.
  • the effect of the present invention is that, by the microstructure and the distribution configuration of the flat regions, the light can be concentrated in the central region where the microstructures are arranged densely to increase the luminance, and the width of the flat region is wide.
  • the side area spreads the light and increases the viewing angle, achieving both the center of the picture Face up to the brightness and the effect of the angle of view.
  • FIG. 1 is an exploded perspective view showing a known backlight module
  • Figure 3 is a plan view showing an embodiment of the prism sheet of the present invention.
  • Figure 4 is a side elevational view of the plurality of microstructures of the embodiment.
  • Figure 5 is a schematic view showing the case where light rays pass through one of the microstructures and one flat region, respectively;
  • Figure 6 is a graph illustrating the density distribution curve of the microstructure on both sides and the center of the embodiment
  • Figure 7 is a graph illustrating the distribution of light fields after the light passes through the embodiment
  • FIG. 8 is an exploded perspective view showing an embodiment of a backlight module and a display device of the present invention.
  • Figure 9 is a schematic view showing the effect of the horizontal prism sheet and the prism sheet of the present invention on light rays;
  • Figure 10 is a schematic view of the light guide plate of the embodiment of the backlight module and the display device
  • Figure 11 is a graph illustrating a change in density of a light guiding structure of the light guide plate
  • Figure 12 is a graph illustrating the variation in pitch of the microstructure.
  • an embodiment of the prism sheet 2 of the present invention includes a body 21 having a light exiting surface 211, and a plurality of microstructures 22 formed on the light exiting surface 211 of the body 21 spaced apart from each other and extending in the same direction.
  • the embodiment has a first region 201, and two second regions 202 respectively located on opposite sides of the first region 201, wherein the arrangement density of the microstructures 22 located in the first region 201 is greater than that in the second region The arrangement density of the microstructures 22 in 202.
  • the microstructures 22 located in the first region 201 are connected to each other and located in the second region.
  • the microstructures 22 in 202 are spaced apart from one another.
  • the light exit surface 211 has a plurality of flat regions 212 formed between each two adjacent microstructures 22.
  • a reference line L parallel to the direction of extension of the microstructure 22 is defined, the reference line L passing through the midpoint of the body 21.
  • the width of the flat region 212 is gradually widened toward a direction away from the reference line L, and the arrangement density of the microstructures 22 is tapered toward a direction away from the reference line L, and each The length of a microstructure 22 extends along the reference line L which is equal to the length of the body 21 of the prism sheet 2 extending along the reference line L.
  • the Y-axis in FIG. 7 employs an arbitrary unit of light intensity (a.u.).
  • the curve C1 in the first region 201, the arrangement density of the microstructures 22 is large, and the light rays 22 can effectively travel toward the positive viewing angle through the microstructures 22, thereby improving the light intensity near the central position.
  • each of the second regions 202 when light passes through each of the flat regions 212, since the interface between the flat regions 212 and the air is substantially horizontal, the light is larger than the incident angle due to the angle of refraction.
  • the relationship is outwardly divergent, and the light is not caused to refract toward the front view direction as compared with the contact with the microstructures 22, so in the second region 202 in which the flat region 212 is gradually widened, Moving away from the central portions of the center, the light energy is not concentrated toward the positive viewing angle due to the reduced light passing through the microstructures 22, while maintaining a large angle of view.
  • the arrangement density of the microstructures 22 of this embodiment is tapered toward a direction away from the reference line L, that is, the closer the microstructures 22 are distributed in the range closer to the reference line L, even at The microstructures 22 in the first region 201 are connected to each other, which effectively converges the light to increase the luminance.
  • the width of the flat region 212 is gradually widened in the second region 202 in a direction away from the reference line L, in the second region 202 closer to both sides
  • the viewing angle can be effectively improved within the range.
  • FIG. 8 is an embodiment of a backlight module and a display device according to the present invention.
  • the embodiment of the backlight module includes a light source 3 , a light guide plate 4 for guiding light emitted by the light source 3 , and a light guide plate disposed on the light guide plate.
  • the prism sheet 2 of the present invention in front of 4, the horizontal prism sheet 5 disposed between the prism sheet 2 of the present invention and the light guide plate 4, and the prism sheet 2 and the horizontal prism sheet 5 respectively provided in the present invention
  • Two diffusion sheets 6 Two diffusion sheets 6.
  • the light source 3 faces a side edge 41 of the light guide plate 4, and the prism sheet 2 is a vertical prism sheet.
  • the microstructure 22 of the prism sheet 2 extends in a direction perpendicular to the extending direction of the side edge 41.
  • the horizontal prism sheet 5 has a plurality of horizontal microstructures 51 extending in the extending direction of the side edges 41 and connected to each other.
  • the representative is perpendicular to the light source 3 .
  • the light intensity distribution curve V in the direction of the side obviously exhibits a case where the light intensity toward the side of the light source 3 is strong, and the light intensity distribution curve H representing the direction parallel to the side edge exhibits an average dispersion.
  • the horizontal prism sheet 5 is added, the light rays perpendicular to the side edges can be deflected toward the positive viewing angle by the horizontal microstructures 51, thereby concentrating the presented light field distribution toward the positive viewing angle.
  • the light intensity distribution curve H representing the direction parallel to the side is known, and the light field exhibiting the average dispersion is also concentrated toward the positive viewing angle.
  • the effective improvement of the central luminance of the backlight module can simultaneously take into consideration the viewing angle.
  • the light guide plate 4 has a plurality of light guiding structures 400.
  • the X axis shown in FIG. 11 may be any distance unit, and the Y axis represents the plurality of light guides in percentage (%).
  • the density of the structure 400, the density of the plurality of light guiding structures 400 increases from a position adjacent to the light source 3 toward a position away from the light source 3 in a direction along the first axis Y.
  • each of the light guiding structures 400 When light passes through each of the light guiding structures 400, the light is relatively easily emitted toward the prism sheet 2 by the light guiding structure 400, so when the distribution density of the plurality of light guiding structures 400 is away from the light source 3 When increasing, the farther away from the position of the light source 3, the easier it is to emit light toward the prism sheet 2, and to prevent the light from being concentrated at a position closer to the light source 3, thereby ensuring uniform distribution of light.
  • the X-axis and the Y-axis shown in FIG. 12 may be any distance single. Bits to indicate the spacing of each of the two microstructures 22 as a function of distance.
  • the density of the plurality of microstructures 22 of the prism sheet 2 is decreased from the reference line L away from the reference line L along the second axis X, and the first axis Y and the first The two axes X intersect.
  • the distribution of the pitch of the microstructures 22 along the direction of the second axis X is as shown in FIG.
  • the pitch of the plurality of microstructures 22 of the prism sheet 2 is increased from the reference line L away from the reference line L along the second axis X.
  • the brightness of the center of the light-emitting surface is stronger and the angle of view of the two sides away from the center in the direction of the second axis X is higher. Wide light field.
  • an embodiment of the display device of the present invention includes a display panel 7 and a backlight module of the present invention.
  • the display panel 7 is located in front of the prism sheet 2 of the present invention to display an image by using the light generated by the backlight module of the present invention.
  • the horizontal prism sheet 5 of the embodiment of the backlight module of the present invention has a plurality of horizontal microstructures 51 extending in the extending direction of the side edges 41 and connected to each other.
  • the direction of the bottom side of the light source 3 is mostly taken, that is, the extending direction of the side 41 and the horizontal microstructure 51 is the left and right of the user. direction.
  • the horizontal microstructure 51 of the horizontal prism sheet 5 is used for the convergence to be diffused toward the upper and lower sides. The light, thereby increasing the brightness.
  • the display device of the present invention can be realized by the prism sheet 2 of the present invention by using the microstructures 22 extending in a direction perpendicular to the side edges 41 and the flat regions 212 in the left-right direction when viewed by the user. Increasing the central viewing brightness while expanding the viewing angle can indeed meet the requirements of general users for brightness and viewing angle.
  • light can be concentrated in the central region to increase the luminance, and the light is diffused in the two regions to increase the viewing angle, thereby achieving the center of the screen. While the luminance is increased, the effect of the viewing angle is enlarged to provide a good display effect, and thus the object of the present invention can be achieved.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

一种棱镜片（2）、背光模组以及显示设备，其中棱镜片（2）包含具有出光面（211）的本体（21），和彼此间隔地形成于该本体（21）的出光面（211）上并且沿相同方向延伸的多个微结构（22）。其中，该出光面（211）具有形成于每两个相邻微结构（22）之间的多个平坦区（212）。定义平行于所述微结构（22）的延伸方向的参考线（L），所述平坦区（212）的宽度以朝着远离该参考线（L）的方向而渐宽；换言之，所述微结构（22）的排列密度以朝着远离该参考线（L）的方向而渐疏。通过所述微结构（22）对光线的引导的效果，能同时兼顾中央辉度和视角，并且能通过该棱镜片（2）制成背光模组和显示设备。

Description

棱镜片、背光模组及显示设备 技术领域
本发明涉及一种光学设备，特别是指一种棱镜片、背光模组及显示设备。
背景技术
参照图1，为公知的背光模组1，包含光源11、用于引导该光源11所发出的光线的导光板12，以及设置于该导光板12前方的第一扩散片13、设置于该第一扩散片13前方的第一棱镜片14，以及设置于该第一棱镜片14前方的第二扩散片15。其中，由于单纯以该导光板12和该第一扩散片13引导光线会使得辉度不佳，因此，该第一棱镜片14具有彼此等距间隔形成在表面上并且以垂直于光线的入射方向延伸的多个第一微结构141，以使光线产生折射，通过改变光线出射的角度而产生聚光效果，并通过该第二扩散片15增加出射光的方向性以提供均匀且中央辉度佳的光场。
参照图2，为了考虑到垂直于光线入射方向的中央辉度，该背光模组1还包含设置于该第一棱镜片14与该第二扩散片15之间的第二棱镜片16。而该第二棱镜片16具有彼此等距间隔形成在表面上并且以平行于光线的入射方向延伸的多个第二微结构161。光线经过所述第二微结构161时，会产生折射而在垂直于光线的入射方向产生聚光效果，会牺牲视角而提高正视辉度。然而，对于设置该第二棱镜片16的该背光模组1，虽然在垂直和平行于光线的入射方向上均缩小视角而提高了辉度，但是在制成显示器时，却也造成了视角变小的问题，因而影响显示器的显示效果。
发明内容
因此，本发明的目的是提供一种能同时兼顾画面中央正视辉度以及视角的棱镜片。
于是，本发明的棱镜片包含具有出光面的本体，和彼此间隔地形成于该本体的出光面上并且沿相同方向延伸的多个微结构。其中，该出光面具有形成于每两个相邻微结构之间的多个平坦区。定义平行于所述微结构的延伸方向的参考线，所述平坦区的宽度以朝远离该参考线的方向而渐宽。
于是，本发明的棱镜片包含具有出光面的本体，和彼此间隔地形成于该本体的出光面上并且沿相同方向延伸的多个微结构。定义平行于所述微结构的延伸方向的参考线，所述微结构的排列密度以朝着远离该参考线的方向而渐疏。
当光线通过每一个微结构时，会产生使光线汇聚的效果，因此在设置有所述微结构的位置处能有效地汇聚光线而提高辉度。另外，当光线通过每一个平坦区时，会产生使光线扩散的效果，因此在所述平坦区的位置处，光线会朝向两侧出射而使可视角度变广。本发明的棱镜片的所述微结构的排列密度是以朝着远离该参考线的方向而渐疏，也就是说，所述微结构在靠近该参考线的范围内分布较密，能有效地汇聚光线而提高中央辉度。而所述平坦区的宽度以朝着远离该参考线的方向而渐宽，在越靠近两侧的范围内越能有效地提高可视角度，因此能实现同时兼顾画面中央正视辉度和左右两侧视角的效果。
本发明的另一个目的是提供一种能同时兼顾画面中央正视辉度和视角的背光模组以及显示设备。
本发明的背光模组包含光源、用于以引导该光源所发出的光线的导光板，以及如前文所述的本发明的棱镜片。而本发明的显示设备包含显示面板，以及如前文所述的本发明的背光模组，其中，该显示面板位于该棱镜片的前方。通过本发明的棱镜片能实现同时兼顾画面中央正视辉度和视角的效果，使得本发明的背光模组能提供兼顾中央辉度以及视角的光源，而以该背光模组所制成的本发明的显示设备，则因此能提供兼顾画面中央正视辉度以及视角的显示效果。
本发明的效果在于：通过所述微结构以及所述平坦区的分布配置，能在所述微结构排列较密的中央区域汇聚光线而提高辉度，并在所述平坦区宽度较宽的两侧区域使光线扩散而增加可视角度，实现同时兼顾画面中央 正视辉度以及视角的效果。
附图说明
本发明其他的特征及效果，将在参照附图的实施方式中清楚地呈现，其中：
图1是立体分解图，说明公知的背光模组；
图2是立体分解图，辅助说明该公知的背光模组；
图3是俯视图，说明本发明棱镜片的实施例；
图4是侧视图，辅助说明该实施例的多个微结构；
图5是示意图，说明光线分别通过其中一个微结构和一个平坦区的情况；
图6是曲线图，说明所述微结构在该实施例两侧与中央的密度变化分布曲线；
图7是曲线图，说明光线通过该实施例后的光场的分布情况；
图8是立体分解图，说明本发明背光模组和显示设备的实施例；
图9是示意图，说明水平棱镜片和本发明棱镜片对光线所产生的影响；
图10是示意图，辅助说明该背光模组和该显示设备的实施例的导光板；
图11是曲线图，说明该导光板的导光结构的密度变化；以及
图12是曲线图，说明所述微结构的间距变化。
具体实施方式
参照图3与图4，本发明棱镜片2的实施例包含具有出光面211的本体21，以及彼此间隔形成于该本体21的出光面211上并且沿相同方向延伸的多个微结构22。该实施例具有第一区域201，以及分别位于该第一区域201两侧的两个第二区域202，其中，位于该第一区域201中的微结构22的排列密度大于位于所述第二区域202中的微结构22的排列密度。优选地，位于该第一区域201中的微结构22互相连接，位于所述第二区域 202中的微结构22互相间隔。
该出光面211具有形成于每两个相邻微结构22之间的多个平坦区212。定义平行于所述微结构22的延伸方向的参考线L，该参考线L通过该本体21的中点。所述平坦区212的宽度是以朝着远离该参考线L的方向而渐宽的，而所述微结构22的排列密度是以朝着远离该参考线L的方向而渐疏的，并且每一微结构22的长度是沿着该参考线L延伸，该长度与该棱镜片2的本体21沿着该参考线L所延伸的长度相等。
结合图4参照图5，当光线通过每一个微结构22时，每一个微结构22与空气之间的界面所呈的角度会使得光线产生朝向中央折射的现象。如图6所示，就所述微结构22的密度而言，靠近中央的密度较大而相对两侧的位置处的密度则较小，因此在靠近中央的位置的光线更容易受到所述微结构22的影响，而相对两侧的位置的光线受到所述微结构22的影响程度则相对较低。
结合图4与图6参照图7，图7中的Y轴采用光强度的任意单位(arbitrary unit,a.u.)。如曲线C1所示，在该第一区域201中，所述微结构22的排列密度较大，能有效地通过所述微结构22使光线朝向正视角行进，提高靠近中央位置的光强度，由此改变光场分布而提高辉度，特别在所述微结构22彼此相互连接的情况下，更能有效提高中央辉度。另外，如曲线C2所示，在每一个第二区域202中，当光线通过每一个平坦区212时，由于该平坦区212与空气的界面实质呈水平状，光线会因折射角大于入射角的关系而向外发散，相较于接触所述微结构22而言，则不会使光线产生朝向正视方向折射的现象，因此在所述平坦区212逐渐变宽的所述第二区域202中，远离中央的两侧部分，会由于通过所述微结构22的光线变少，光线能量则不会朝向正视角集中，而保有大角度可视角。
该实施例的所述微结构22的排列密度是以朝着远离该参考线L的方向而渐疏，即，所述微结构22在越靠近该参考线L的范围内分布越密，甚至在该第一区域201中的所述微结构22是彼此相互连接的，这能有效汇聚光线而提高辉度。而所述平坦区212的宽度在所述第二区域202中以朝着远离该参考线L的方向而渐宽，在越靠近两侧的所述第二区域202的 范围内能有效提高可视角度。配合所述微结构22以及所述平坦区212的位置分布，就能达成同时兼顾辉度以及视角的效果。
参照图8，图8是本发明背光模组及显示设备的实施例，该背光模组的实施例包含光源3、用于引导该光源3所发出的光线的导光板4、设置于该导光板4的前方的本发明的棱镜片2、设置于本发明的棱镜片2与该导光板4之间的水平棱镜片5，以及分别设置于本发明的棱镜片2和该水平棱镜片5上下的两个扩散片6。其中，该光源3朝向该导光板4的一个侧边41，而该棱镜片2是垂直棱镜片，该棱镜片2的所述微结构22的延伸方向垂直于该侧边41的延伸方向。该水平棱镜片5具有沿该侧边41的延伸方向延伸并且彼此相互连接的多个水平微结构51。
结合图8参照图9，该光源3所发出的光线通过该导光板4，并通过扩散片6时，由于该光源3自该导光板4的该侧边41入射，因此，在代表垂直于该侧边的方向的光强度分布曲线V明显会呈现朝向该光源3的一侧的光强度较强的情况，而代表平行于该侧边的方向的光强度分布曲线H则呈现平均分散的情况。但是，在增加了该水平棱镜片5之后，通过这些水平微结构51能使垂直于该侧边的方向的光线朝向正视角偏折，由此将呈现的光场分布朝向正视角集中。而经过该水平棱镜片5的光线又通过本发明的棱镜片2时，由代表平行于该侧边的方向的光强度分布曲线H可知，呈现平均分散的光场也会朝向正视角集中，因此，有效提高该背光模组的中央辉度，同时又能兼顾视角。
参照图10与图11，该导光板4具有多个导光结构400，如图11所示的X轴可为任意的距离单位，而Y轴则是以百分比(％)表示该多个导光结构400的密度，该多个导光结构400的密度从邻近该光源3的位置朝向远离该光源3的位置以沿着第一轴线Y的方向而增加。当光线通过每一个导光结构400时，光线会因通过所述导光结构400而较容易朝向该棱镜片2出光，因此当该多个导光结构400的分布密度以远离该光源3的方向而增加时，越远离该光源3的位置才越容易使光线朝向该棱镜片2出光，避免光线集中于较靠近该光源3的位置出光，能确保光线的均匀分布。
结合图12参照图10，图12所示的X轴与Y轴可为任意的距离单 位，以表示每两个微结构22的间距随着距离的变化。在本实施例中，该棱镜片2的该多个微结构22的密度是从该参考线L朝向远离该参考线L以沿着第二轴线X而减少，且该第一轴线Y与该第二轴线X相交。其中，所述微结构22的间距沿该第二轴线X的方向的分布情况如图12所示。详细地说，该棱镜片2的该多个微结构22的间距是从该参考线L朝向远离该参考线L以沿着该第二轴线X而增加的。通过设计该棱镜片2的多个微结构22的分布而使光线通过该棱镜片2时，能呈现发光面中央的辉度较强且在该第二轴线X方向上远离中央的两侧视角较广的光场。
重新参照图8，本发明的显示设备的实施例包含显示面板7及本发明的背光模组。其中，该显示面板7位于本发明的棱镜片2的前方，以利用本发明的背光模组所产生的光线来显示影像。
值得说明的是，本发明的背光模组的实施例的该水平棱镜片5具有沿该侧边41的延伸方向延伸并且彼此相互连接的多个水平微结构51。当使用者观看本发明的显示设备时，大多是采取以所述光源3为底侧的设置方向，也就是说，该侧边41及所述水平微结构51的延伸方向即为使用者的左右方向。就一般使用者观看本发明的显示设备的要求而言，针对上下方向的可视角度的需求较少，因此该水平棱镜片5的所述水平微结构51用于汇聚原本将朝上下两侧扩散的光线，由此提高辉度。然而，就一般用户对于左右方向的可视角度的要求而言，例如电视或是大尺寸显示设备，则必须尽可能增加左右方向的可视角度，使本发明的显示设备在供位于各种不同角度的观看者观看时都能提供良好的显示效果。因此，本发明的显示设备通过本发明的棱镜片2，能利用沿垂直于该侧边41的方向延伸的所述微结构22以及所述平坦区212，就使用者观看时的左右方向，达到提高中央正视辉度的同时扩大视角的效果，确实能符合一般使用者对于辉度以及可视角度的要求。
综上所述，通过所述微结构22以及所述平坦区212的分布配置，能在中央区域汇聚光线而提高辉度，并在两侧区域使光线扩散而增加可视角度，达到兼顾画面中央正视辉度的同时扩大视角的效果，以提供良好的显示效果，因此确实能达到本发明的目的。
所有上述内容仅为本发明之实施例而已，不应当以此限定本发明的实施范围，所有根据本发明的权利要求范围和专利说明书内容作出的简单的等效变化与修改，都仍然属于本发明专利包括的范围内。
【符号说明】
2    棱镜片                 5   水平棱镜片
201  第一区域               51  水平微结构
202  第二区域               6   扩散片
21   本体                   7   显示面板
211  出光面                 C1  曲线
212  平坦区                 C2  曲线
22   微结构                 H   光强度分布曲线
3    光源                   V   光强度分布曲线
4    导光板                 L   参考线
400  导光结构               Y   第一轴线
41   侧边                   X   第二轴线

Claims (13)

  1. 一种棱镜片，其包含具有出光面的本体，和彼此间隔地形成于所述本体的所述出光面上并且沿相同方向延伸的多个微结构，所述出光面具有形成于每两个相邻所述微结构之间的多个平坦区，定义平行于所述微结构的延伸方向的参考线，所述平坦区的宽度以朝着远离所述参考线的方向而渐宽。
  2. 根据权利要求1所述的棱镜片，其中，所述参考线通过所述本体的中点。
  3. 根据权利要求1所述的棱镜片，其中，每一个所述微结构的长度沿着所述参考线延伸，并且等于所述棱镜片的所述本体沿着所述参考线延伸的长度。
  4. 一种棱镜片，其包含具有出光面的本体，和彼此间隔地形成于所述本体的出光面上并且沿相同方向延伸的多个微结构，定义平行于所述微结构的延伸方向的参考线，所述微结构的密度排列以朝着远离所述参考线的方向而渐疏。
  5. 根据权利要求4所述的棱镜片，其中，所述参考线通过所述本体的中点。
  6. 根据权利要求4所述的棱镜片，其中，每一个所述微结构的长度沿着所述参考线延伸，并且等于所述棱镜片的所述本体沿着所述参考线延伸的长度。
  7. 根据权利要求4所述的棱镜片，其中，所述棱镜片具有第一区域，和分别位于所述第一区域的两侧的两个第二区域，其中，位于所述第一区域中的微结构的排列密度大于位于所述第二区域中的微结构的排列密度。
  8. 根据权利要求7所述的棱镜片，其中，位于所述第一区域中的微结构互相连接，位于所述第二区域中的微结构互相间隔。
  9. 一种背光模组，包含光源、用于引导所述光源所发出的光线的导光板，和根据权利要求1至8中任一项所述的棱镜片。
  10. 根据权利要求9所述的背光模组，其中，所述棱镜片设置于所述 导光板的前方。
  11. 根据权利要求9所述的背光模组，其中，所述光源朝向所述导光板的一个侧边，所述棱镜片的所述微结构的延伸方向垂直于所述侧边的延伸方向。
  12. 根据权利要求9所述的背光模组，其中，所述导光板具有多个导光结构，所述多个导光结构的密度从邻近所述光源的位置朝着远离所述光源的位置沿着第一轴线而增加，所述棱镜片的所述多个微结构的密度从所述参考线朝向远离所述参考线沿着第二轴线而减小，并且所述第一轴线与所述第二轴线相交。
  13. 一种显示设备，其包含显示面板以及如权利要求9所述的背光模组，其中，所述显示面板位于所述棱镜片的前方。
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