WO2017028456A1 - 导光膜、背光模块和显示设备 - Google Patents

导光膜、背光模块和显示设备 Download PDF

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Publication number
WO2017028456A1
WO2017028456A1 PCT/CN2015/099791 CN2015099791W WO2017028456A1 WO 2017028456 A1 WO2017028456 A1 WO 2017028456A1 CN 2015099791 W CN2015099791 W CN 2015099791W WO 2017028456 A1 WO2017028456 A1 WO 2017028456A1
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WIPO (PCT)
Prior art keywords
light
substrate
light guiding
guiding film
film according
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PCT/CN2015/099791
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English (en)
French (fr)
Inventor
钟元振
陈蔚轩
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瑞仪光电(苏州)有限公司
瑞仪光电股份有限公司
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Priority to US15/295,004 priority Critical patent/US10267971B2/en
Publication of WO2017028456A1 publication Critical patent/WO2017028456A1/zh
Priority to US16/280,540 priority patent/US10620358B2/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—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
    • G02B6/0065—Manufacturing aspects; Material aspects

Definitions

  • the present invention relates to optical devices, and more particularly to light directing films, backlight modules, and display devices.
  • a known light guiding film 1 is adapted to cooperate with a light source 2 disposed at one end thereof for guiding light emitted by the light source 2.
  • the light guiding film 1 includes a substrate 11.
  • the light emitted by the light source 2 enters from one end of the substrate 11, and is transferred in the substrate 11 by the principle of total reflection.
  • the thickness of the light guiding film 1 is uniform and the thickness is smaller than that of the light source 2 in the form of an LED, a part of the light emitted by the light source 2 is inevitably unable to enter the light from the light guiding film 1.
  • the surface enters the light guiding film 1 to cause light leakage. This not only affects the uniformity of light transmitted by the light guiding film 1, but also depletes part of the light energy emitted by the light source 2, thereby affecting the display effect of the display on which the light guiding film 1 is mounted.
  • the light guiding film of the present invention comprises a substrate and a rubber unit provided to match the substrate.
  • the substrate has an end surface, a light exit surface connecting the end surfaces, and a bottom surface opposite to the light exit surface.
  • the glue unit includes a primer layer applied to a bottom surface of the substrate and a light guide attached to an end surface of the substrate.
  • the refractive index of the substrate is smaller than the refractive index of the rubber material unit.
  • the refractive index of the light guiding body is large, the critical angle at which the total reflection can be generated is small for the interface between the light guiding body and the air, so the light is When transmitted in the light guide body, total reflection is more likely to occur, so that light energy is less likely to escape in the light guide body of the glue unit, and can be surely transferred into the substrate.
  • the light since the light is only once refracted at the interface between the light guide and the substrate before being transmitted to the substrate, it can be reduced. The light energy loss that occurs when there is less refraction, and therefore can actually transmit the light energy emitted by the light source.
  • Another object of the present invention is to provide a backlight module capable of reliably transmitting light energy emitted from a light source and a display device including the same.
  • the backlight module of the present invention comprises a light source and the light guiding film of the present invention.
  • the light guiding film guides the light emitted by the light source and emits light from the light emitting surface of the substrate. Since the light guiding film can pass through the light guiding body of the rubber material unit, the light energy emitted by the light source can be reliably transmitted to the substrate without being easily dissipated, so that the backlight module can achieve the effect of reliably transmitting light energy. .
  • the display device of the present invention comprises a display panel and a backlight module of the present invention, wherein the display panel is located in front of the light exiting surface of the substrate.
  • the display device can also achieve the effect of reliably transmitting light energy by the backlight module, and can optimize the quality of the display by properly utilizing the light energy emitted by the light source.
  • the effect of the invention is that since the refractive index of the light guide body of the rubber material unit is larger than the refractive index of the substrate, when the light is transmitted through the light guide body, the interface between the light guide body and the air is higher than the critical angle.
  • the small relationship is easier to generate total reflection and continue to transmit light energy, so that the light energy emitted by the light source can be prevented from being dissipated in the light guide body to surely transmit light energy.
  • Figure 1 is a schematic view illustrating a known light guiding film
  • Figure 2 is a schematic view showing a first embodiment of the light guiding film of the present invention
  • Figure 3 is a bar graph showing the refractive index of the substrate and the glue unit of the first embodiment
  • Figure 4 is a schematic view showing a second embodiment of the light guiding film of the present invention.
  • Figure 5 is a schematic view showing a third embodiment of the light guiding film of the present invention.
  • Figure 6 is a schematic view showing a fourth embodiment of the light guiding film of the present invention.
  • Figure 7 is a schematic diagram illustrating an embodiment of a display device of the present invention.
  • a first embodiment of a light directing film 3 of the present invention includes a substrate 31 and a glue unit 32 disposed to fit the substrate 31.
  • the substrate 31 is made of PC or PMMA material
  • the glue unit 32 is first coated with a UV-cured acrylate resin on the substrate 31, and then the transparent mold is placed thereon. It is formed by curing UV glue by ultraviolet light irradiation.
  • the base material 31 has an end surface 311, a light-emitting surface 312 that connects the end surface 311, and a bottom surface 313 that faces the light-emitting surface 312.
  • the rubber unit 32 includes a primer layer 321 applied to the bottom surface 313 of the substrate 31 and a light guide 322 connected to the end surface 311 of the substrate 31.
  • the primer layer 321 of the rubber material unit 32 is integrally formed with the light guide body 322, and a boundary between the light guide body 322 and the base material 31 is perpendicular to a bottom surface 313 of the base material 31.
  • the light guide body 322 has a top surface 323 extending obliquely toward the base material 31, a light incident surface 324 that is engaged with the top surface 323, and a light incident surface 324 that faces the light incident surface 324 and is joined to the end surface 311 of the base material 31. Joint surface 325.
  • the refractive index of the substrate 31 is smaller than the refractive index of the rubber unit 32.
  • the refractive index of the substrate 31 is defined as n1
  • the refractive index of the rubber unit 32 is defined as n2, where 1.5 ⁇ n2/n1>1.
  • the light When the light is emitted from the light source 4 and is incident from the light incident surface 324 of the light guide body 322, it is first transmitted in the light guide body 322.
  • the light When the light is transmitted to the interface between the light guide body 322 and the air, total reflection is generated according to the incident angle and continues to be transmitted, or refraction is generated to escape.
  • the refractive index of the light guide body 322 is larger than the refractive index of the substrate 31, a critical angle of total reflection phenomenon occurs at the interface between the light guide body 322 and the air compared with the interface between the substrate 31 and the air. Smaller.
  • top surface 323 of the light guide body 322 extends obliquely in the direction toward the substrate 31, when light is transmitted to the position of the top surface 323, total reflection is more likely to occur and the transmission is continued, and the light is also reduced. The probability of direct refraction and escape at the same location. And a part of the light transmitted to the substrate 31 is totally reflected at the interface between the substrate 31 and the air (that is, at the light-emitting surface 312), and continues to be transmitted in the substrate 31, and another portion of the light passes through the portion.
  • the interface between the substrate 31 and the primer layer 321 is refracted, and is returned to the substrate 31 after the angle is changed due to the destruction of total reflection by the interface between the primer layer 321 and the air, wherein less than the total reflection angle
  • the light does not cause total reflection on the light-emitting surface 312 and emits light from the light-emitting surface 312.
  • the opportunity of energy allows the light emitted by the light source 4 to be reliably transmitted through the light guiding film 3.
  • the experiment was carried out with the refractive index of the substrate 31 being 1.59, and the light energy data (that is, the control group A) having the same refractive index of the rubber material unit 32 as the refractive index of the substrate 31 was used as a reference.
  • the refractive index (1.49) of the rubber material unit 32 is smaller than the refractive index of the substrate 31, and the refractive index (1.69, 1.80, 2.00, 2.20, 2.40) of the rubber material unit 32 is larger than the substrate.
  • the experimental groups C, D, E, F, and G of the refractive index of 31 units were measured. According to the data shown in FIG. 3, the ratio of the dissipated light energy data shown in the experimental group B is significantly higher than that of the control group A, that is, the light energy dissipation amount of the experimental group B is larger than the control group. The amount of light energy dissipated by A. Therefore, when the refractive index of the rubber unit 32 is smaller than the refractive index of the substrate 31, the effect of reducing the light energy dissipation at the position of the light guide body 322 cannot be achieved.
  • the ratio of the dissipated light energy data shown in the experimental group C is less than half of the control group A, indicating that when the refractive index of the rubber unit 32 is greater than the refractive index of the substrate 31,
  • the position of the light guide body 322 reduces the effect of light energy escaping and transmitting light energy.
  • the larger the refractive index of the rubber material unit 32 the smaller the proportion of the light energy data that escapes, and when the rubber material is When the refractive index of the unit 32 is greater than 2, the ratio of the dissipated light energy data is even less than 3%.
  • the refractive index of the rubber material unit 32 of the experimental group C is 1.69, which is 1.06 times the refractive index of the substrate 31 (1.59); the refractive index of the rubber material unit 32 of the experimental group G is 2.4, which is the refractive index of the substrate. At a rate of 1.50 times, it was also confirmed that when the ratio of the refractive index of the rubber unit 32 to the refractive index of the substrate 31 is 1.5 ⁇ n2 / n1 > 1, the effect of transmitting light energy can be achieved.
  • a second embodiment of the light guiding film 3 of the present invention is different from the first embodiment in that the primer layer 321 has a plurality of microstructures 326 on the bottom surface 313 thereof.
  • One of the microstructures 326 is in the shape of a dot, and the arrangement density of the plurality of microstructures 326 near the light guide body 322 is small, and the arrangement density away from the light guide body 322 is large.
  • the second embodiment can achieve all the effects of the first embodiment, since the light is from After the light guide body 322 is transferred to the substrate 31, it passes through the interface between the primer layer 321 and the air multiple times during the process of continuing the transfer, so that a plurality of the light guide body 322 are formed on the bottom surface 313 of the primer layer 321 .
  • the microstructure 326 increases the probability of damaging light at the interface of the primer layer 321 and the air.
  • the plurality of microstructures 326 are densely arranged, the total reflection phenomenon caused by the passing light is more likely to be broken, so that the substrate 31 can be uniformly emitted from the light-emitting surface 312, the plurality of micro- The arrangement density of the structure 326 at a position away from the light guide body 322 is large to increase the probability of destroying the total reflection, and the position away from the light guide body 322 can also reach the same brightness as the position close to the light guide body 322. Therefore, the light-emitting surface 312 of the substrate 31 can surely transmit light energy and uniformly emit light.
  • a third embodiment of the light guiding film 3 of the present invention is different from the first embodiment in that the top surface 323 of the light guiding body 322 does not exhibit oblique extension, but It extends horizontally at the same position as the light-emitting surface 312 of the substrate 31 to meet the actual demand of the light-guide film 3 of the same thickness.
  • a fourth embodiment of the light guiding film 3 of the present invention is different from the first embodiment in that the primer layer 321 and the light guiding body 322 are not integrally formed, but The molding may be separately formed, and even the primer layer 321 and the light guiding body 322 are not connected to each other, but are spaced apart from each other to satisfy various requirements of the light guiding film 3 or a divisional molding method in production.
  • the first to fourth embodiments of the backlight module of the present invention respectively comprise a light source 4 and a light guiding film of the present invention.
  • the light guiding film 3 guides the light emitted by the light source 4, and emits light from the light emitting surface 312 of the substrate 31, and the height of the light guiding body 322 is higher than or equal to the height of the light source 4, so that The light emitted by the light source 4 can be incident from the light guide body 322, and the height of the substrate 31 is smaller than the height of the light source 4 to match the tilt angle of the top surface 323 of the light guide body 322, thereby reliably transmitting the light source 4 The light energy emitted by the light source 4.
  • an embodiment of a display device of the present invention includes a display panel 6 and a backlight module of the present invention.
  • the display panel 6 is located in front of the light-emitting surface 312 of the substrate 31 to receive the light energy transmitted from the light-emitting surface 312.
  • Light provided by the backlight module is irradiated on the display panel 6 to enable the display device of the present invention to generate a function of displaying information, and can
  • the backlight module of the present invention and the light guiding film 3 of the present invention surely achieve the effect of transmitting light energy, and the display effect of the display device of the present invention is optimized.
  • the refractive index of the light guide body 322 of the rubber material unit 32 is greater than the refractive index of the substrate 31.
  • the critical angle is small. It is easier to generate total reflection and then continue to transmit light energy, and before the light is transmitted to the substrate 31, only one-time refraction of the interface between the light guide body 322 and the substrate 31 is required to prevent the light energy from being lost due to multiple refractions. It is possible to surely transfer light energy to the substrate 31, so that the object of the present invention can be achieved.

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

一种导光膜（3），其包括基材（31）和配合该基材（31）设置的胶材单元（32）。该基材（31）具有端面（311）、连接该端面（311）的出光面（312）和与该出光面（312）相对的底面（313）。该胶材单元（32）包括涂布于该基材（31）的底面（313）上的底胶层（321）和连接于该基材（31）的端面（311）的导光体（322）。光线先行入射该导光体（322）而传递，由于该基材（31）的折射率小于该胶材单元（32）的折射率，所以光线在该导光体（322）传递时容易在与空气的界面产生全反射，所以能避免光能在该导光体（322）传递时发生散失，由此确实达到传递光能的效果。在显示设备上安装使用了该导光膜（3）的背光模块，更能充分利用该光源所发出的光线，以优化该显示设备的显示质量。

Description

导光膜、背光模块和显示设备 技术领域
本发明涉及光学设备，特别涉及导光膜、背光模块和显示设备。
背景技术
参阅图1，为公知的导光膜1，适用于配合设置于其一端的光源2，并用以引导该光源2所发出的光线。该导光膜1包括基材11。该光源2所发出的光线由该基材11的一端进入，在该基材11中以全反射原理而传递。
然而，由于该导光膜1的厚度是均一的而且与LED形态的该光源2相比厚度较小，所以该光源2所发出的光线中必然会有一部分无法从该导光膜1的入光面进入到该导光膜1，从而产生漏光现象。这不但影响该导光膜1传导光线的均匀度，而且耗损了该光源2所发出的部分光能，进而影响安装有该导光膜1的显示器的显示效果。
发明内容
因此，本发明的目的是提供一种能确实传递光源所发出的光能的导光膜。
于是，本发明的导光膜，包含基材和配合该基材而设置的胶材单元。该基材具有端面、连接该端面的出光面和与该出光面相对的底面。该胶材单元包括涂布于该基材的底面的底胶层和连接于该基材的端面的导光体。其中，该基材的折射率小于该胶材单元的折射率。
当光线从该导光体入射该导光膜时，由于该导光体的折射率较大，所以对于该导光体与空气的界面而言，能产生全反射的临界角较小，因此光线在该导光体中传递时，较容易产生全反射，因此光能较不容易在该胶材单元的该导光体逸散，并且能确实传递至该基材中。况且，由于光线在传递至该基材之前，仅在该导光体与该基材的界面产生一次折射，所以能减 少折射时发生的光能耗损，也因此能确实传递光源所发出的光能。
另外，本发明的另一目的在于提供一种能确实传递光源所发出的光能的背光模块和一种包含该背光模块的显示设备。
于是，本发明的背光模块，包含光源和本发明的导光膜。其中，该导光膜引导该光源所发出的光线，并从该基材的该出光面出光。由于该导光膜能通过该胶材单元的该导光体，使该光源所发出的光能确实传递至该基材中而不易产生逸散，所以该背光模块能达到确实传递光能的效果。
本发明的显示设备，包含显示面板和本发明的背光模块，其中，该显示面板位于该基材的该出光面前方。该显示设备通过该背光模块，也能凭借该背光模块达到确实传递光能的效果，并且能因妥善利用该光源所发出的光能而优化显示的质量。
本发明的效果在于：由于该胶材单元的导光体的折射率大于该基材的折射率，所以光线在该导光体传递时，在该导光体与空气的界面会因临界角较小的关系，较容易产生全反射从而继续传递光能，因此能避免该光源所发出的光能在该导光体产生逸散以确实传递光能。
附图说明
本发明的其他特征及效果，将参照附图的实施方式清楚地呈现，其中：
图1是说明公知的导光膜的示意图；
图2是说明本发明导光膜的第一实施例的示意图；
图3是说明该第一实施例的基材及胶材单元的折射率的条状数据图；
图4是说明本发明导光膜的第二实施例的示意图；
图5是说明本发明导光膜的第三实施例的示意图；
图6是说明本发明导光膜的第四实施例的示意图；和
图7是说明本发明显示设备的实施例的示意图。
具体实施方式
在详细描述本发明之前，应当注意，在以下的说明内容中，类似的组 件用相同的编号来表示。
参阅图2，为本发明导光膜3的第一实施例，该第一实施例包含基材31和配合该基材31而设置的胶材单元32。其中，该基材31是以PC或PMMA材料制作而成的，该胶材单元32则是先通过将UV胶(UV-cured acrylate resin)涂布于该基材31，再将透明模具盖置于其上，并以紫外光照射使UV胶固化(aged)而成型的。
该基材31具有端面311、连接该端面311的出光面312和与该出光面312相对的底面313。该胶材单元32包括涂布于该基材31的底面313的底胶层321和连接于该基材31的端面311的导光体322。该胶材单元32的该底胶层321与该导光体322一体成型，且该导光体322与该基材31的交界处呈垂直于该基材31的底面313的直线。该导光体322具有朝向该基材31的方向倾斜延伸的顶面323、与该顶面323衔接的入光面324和与该入光面324相对且与该基材31的端面311接合的接合面325。其中，该基材31的折射率小于该胶材单元32的折射率。将该基材31的折射率定义为n1，并且将该胶材单元32的折射率定义为n2，其中，1.5≥n2/n1＞1。
当光线从光源4发出，并且从该导光体322的入光面324入射后，会先行在该导光体322中传递。而光线在传递至该导光体322与空气的界面时，会依据入射角度的大小而产生全反射并继续传递，或者产生折射而逸散。其中，由于该导光体322的折射率大于该基材31的折射率，所以与该基材31与空气的界面相比较，在该导光体322与空气的界面产生全反射现象的临界角较小。还由于该导光体322的顶面323以朝向该基材31的方向倾斜延伸，所以当光线传递至该顶面323的位置时，更容易产生全反射而继续传递，同时也减少了光线在同一位置直接折射而逸散的几率。而传递至该基材31的光线，一部分会在该基材31与空气的界面(也就是在该出光面312)产生全反射而在该基材31中继续传递，另一部分光线则会经过该基材31与该底胶层321的界面而产生折射，并且在因该底胶层321与空气的界面破坏全反射而改变角度后重新回到该基材31中，其中，小于全反射角的光线不会在该出光面312产生全反射而从该出光面312出光。另外，还由于光线在从该导光体322传递至该基材31的过程中，仅 需要在该导光体322与该基材31的界面(也就是该导光体322的接合面325与该基材31的端面311的位置)产生一次折射，因此还能减少光线因折射而耗损能量的机会，使得该光源4所发出的光线能确实经由该导光膜3传递。
参阅图3并配合图2，为从观察点5朝向该导光体322的顶面323的方向进行观察所得到的逸散的光能数据比例值。其中，以该基材31的折射率为1.59的情况进行实验，并且以该胶材单元32的折射率与该基材31的折射率相同的光能数据(也就是对照组A)为基准，再分别对该胶材单元32的折射率(1.49)小于该基材31的折射率的实验组B和该胶材单元32的折射率(1.69、1.80、2.00、2.20、2.40)大于该基材31单元的折射率的实验组C、D、E、F、G进行测量。根据如图3所示的数据可知，该实验组B所示的逸散的光能数据比例值明显比该对照组A多，也就是说，实验组B的光能逸散量大于该对照组A的光能逸散量。所以当该胶材单元32的折射率小于该基材31的折射率时，无法达到在该导光体322的位置处减少光能逸散的效果。而该实验组C所示的逸散的光能数据比例值为该对照组A的一半以下，表示当该胶材单元32的折射率大于该基材31的折射率时，确实能达到在该导光体322的位置处减少光能逸散并传递光能的效果。并且，根据实验组D、E、F、G持续增加该折射率的实验结果，可见该胶材单元32的折射率越大，逸散的光能数据比例值会越小，而当该胶材单元32的折射率大于2时，逸散的光能数据比例值甚至不到3％。实验组C的胶材单元32的折射率为1.69，为该基材31的折射率(1.59)的1.06倍；实验组G的胶材单元32的折射率为2.4，则为该基材的折射率的1.50倍，也证实了当该胶材单元32的折射率与该基材31的折射率的比值关系为1.5≥n2/n1＞1时，确实能达到传递光能的效果。
参阅图4，为本发明导光膜3的第二实施例，该第二实施例与该第一实施例的差别在于：该底胶层321具有位于其底面313的多个微结构326，每一个微结构326是呈点状，且该多个微结构326靠近导光体322的排列密度小，而远离导光体322的排列密度大。
该第二实施例除了能达到该第一实施例所有的效果之外，由于光线从 该导光体322传递至该基材31后，在继续传递的过程中会多次通过在该底胶层321与空气的界面，所以通过形成于该底胶层321的底面313上的多个微结构326，能增加破坏光线在该底胶层321与空气的界面产生全反射的几率。要特别说明的是，由于该多个微结构326排列越密集，越容易破坏通过的光线产生的全反射现象，所以为了使该基材31能均匀地从该出光面312出光，该多个微结构326在远离该导光体322的位置的排列密度较大，以提高破坏全反射的机率，使远离该导光体322的位置也能达到与靠近该导光体322的位置同样亮度的出光，使得该基材31的出光面312能确实传递光能且均匀出光。
参阅图5，为本发明的导光膜3的第三实施例，该第三实施例与该第一实施例的差别在于：该导光体322的该顶面323不是呈现倾斜延伸，而是在与该基材31的出光面312相同的位置呈水平延伸，以满足相同厚度导光膜3的实际需求。
参阅图6，为本发明的导光膜3的第四实施例，该第四实施例与该第一实施例的差别在于：该底胶层321与该导光体322并非一体成型，而是可以分别制作成型，甚至该底胶层321与该导光体322并非互相连接，而是彼此间隔分离，以满足该导光膜3的各种不同需求或是制作上的分工成型方式。
重新参阅图2与图4，即本发明背光模块的第一实施例至第四实施例，本发明背光模块的第一实施例至第四实施例为分别包含光源4和本发明的导光膜3的第一实施例至第四实施例。其中，该导光膜3引导该光源4所发出的光线，并从该基材31的该出光面312出光，且该导光体322的高度高于或等于该光源4的高度，以使从该光源4所发出的光线都能从该导光体322入射，而该基材31的高度小于该光源4的高度，以配合该导光体322的顶面323的倾斜角度，从而确实传递该光源4所发出的光能。
参阅图7，为本发明的显示设备的实施例，该实施例包含显示面板6和本发明的背光模块。其中，该显示面板6位于该基材31的该出光面312前方，以接收从该出光面312所传出的光能。由该背光模块提供的光线照射在该显示面板6上，以使本发明的显示设备产生显示信息的功能，并能 通过本发明的背光模块和本发明的导光膜3确实达到传递光能的效果，优化本发明的显示设备的显示效果。
综上所述，该胶材单元32的导光体322的折射率大于该基材31的折射率，光线传递至该导光体322与空气的界面时，会因临界角较小的关系，更容易产生全反射而后继续传递光能，且光线传递至该基材31之前，只需要经过该导光体322与该基材31的界面的一次折射，避免光能因多次折射而耗损，能确实将光能传递至该基材31，所以确实能达到本发明的目的。
所有以上描述的内容仅为本发明的实施例而已，不能以此限定本发明实施的范围，凡是根据本发明的权利要求书和说明书内容所作的简单的等效变化与修饰，都仍然属于本发明的权利要求的范围内。

Claims (13)

  1. 一种导光膜，包括：
    基材，所述基材具有端面、连接所述端面的出光面，和与所述出光面相对的底面；和
    胶材单元，所述胶材单元包括涂布于所述基材的所述底面的底胶层，和连接于所述基材的所述端面的导光体；
    其中，所述基材的折射率小于所述胶材单元的折射率。
  2. 根据权利要求1所述的导光膜，其中，所述导光体具有顶面，所述顶面以朝向所述基材的方向倾斜延伸。
  3. 根据权利要求1所述的导光膜，其中，所述导光体具有顶面，所述顶面在与所述基材的所述出光面相同的位置呈水平延伸。
  4. 根据权利要求2所述的导光膜，其中，所述导光体与所述基材的交界处呈垂直于所述基材的所述底面的直线。
  5. 根据权利要求1所述的导光膜，其中，所述导光体具有入光面和与所述入光面相对且接合于所述基材的所述端面的接合面。
  6. 根据权利要求1所述的导光膜，定义所述基材的折射率为n1，而所述胶材单元的折射率为n2，其中，1.5≥n2/n1>1。
  7. 根据权利要求1所述的导光膜，其中，所述底胶层具有位于其底面的多个微结构，每一个微结构呈点状。
  8. 根据权利要求7所述的导光膜，其中，所述多个微结构靠近所述导光体的排列密度小，而远离所述导光体的排列密度大。
  9. 根据权利要求1所述的导光膜，其中，所述胶材单元的所述底胶层与所述导光体一体成型。
  10. 根据权利要求1所述的导光膜，其中，所述胶材单元的所述底胶层与所述导光体彼此间隔分离。
  11. 一种背光模块，其包括光源和根据权利要求1至10中任一项所述的导光膜，其中，所述导光膜引导所述光源所发出的光线，并从所述基材的所述出光面出光。
  12. 根据权利要求11所述的背光模块，其中，所述导光体的高度高于或等于所述光源的高度，所述基材的高度小于所述光源的高度。
  13. 一种显示设备，包含显示面板和根据权利要求1至11中任一项所述的背光模块，其中，所述显示面板位于所述基材的所述出光面的前方。
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