WO2021212376A1 - 光学膜片、背光模组及显示装置 - Google Patents

光学膜片、背光模组及显示装置 Download PDF

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Publication number
WO2021212376A1
WO2021212376A1 PCT/CN2020/086193 CN2020086193W WO2021212376A1 WO 2021212376 A1 WO2021212376 A1 WO 2021212376A1 CN 2020086193 W CN2020086193 W CN 2020086193W WO 2021212376 A1 WO2021212376 A1 WO 2021212376A1
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WIPO (PCT)
Prior art keywords
microstructures
optical film
light
low
strip
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PCT/CN2020/086193
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English (en)
French (fr)
Inventor
陈蔚轩
戴永辉
Original Assignee
瑞仪(广州)光电子器件有限公司
瑞仪光电股份有限公司
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Application filed by 瑞仪(广州)光电子器件有限公司, 瑞仪光电股份有限公司 filed Critical 瑞仪(广州)光电子器件有限公司
Priority to CN202080004957.7A priority Critical patent/CN113906338A/zh
Priority to PCT/CN2020/086193 priority patent/WO2021212376A1/zh
Priority to TW109116788A priority patent/TWI747293B/zh
Priority to TW110146643A priority patent/TWI763615B/zh
Priority to US17/336,837 priority patent/US11320580B2/en
Publication of WO2021212376A1 publication Critical patent/WO2021212376A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02B6/002—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 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—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 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity

Definitions

  • the present invention relates to an optical element, and in particular to an optical film, a backlight module and a display device that improve large-angle light leakage and increase large-angle contrast.
  • liquid crystal display panel does not have a light-emitting function
  • a backlight module must be arranged under the liquid crystal display panel to provide a surface light source, so that the liquid crystal display panel can achieve the purpose of display.
  • the light source module can be divided into a direct type light source module and an edge type light source module.
  • the direct-lit light source module usually includes a plurality of light-emitting elements, a reflective sheet for concentrating the light of the light-emitting element array to the forward direction, and for reducing the viewing angle of the light beam, increasing the forward brightness value, and Multi-layer optical film group with light extraction efficiency.
  • an edge-type light source module as an example, it generally includes a light guide plate, a reflective sheet located under the light guide plate, a light source located on the side of the light guide plate, and the aforementioned multilayer optical film set.
  • the light beam emitted by the light source enters the light guide plate from the light incident surface on the side of the light guide plate, and is guided to the entire light guide plate due to total reflection.
  • the multiple dots located on the bottom surface of the light guide plate will destroy the total reflection of the light, so that the light beam will be emitted from the light emitting surface of the light guide plate, and the forward brightness value and light output efficiency will be improved by the aforementioned multi-layer optical film set, thereby forming the required Surface light source.
  • the object of the present invention is to provide an optical film that can improve the contrast between bright and dark in the large viewing angle area on both sides of the screen.
  • the optical film of the present invention includes a light entrance side and a light exit side opposite to the light entrance side.
  • the optical film is divided into a middle area along the X axis direction and two sides respectively located on both sides of the middle area Side area, wherein a plurality of protruding strip structures are arranged on the light emitting side of each side area, the plurality of strip structures are arranged along the direction of the X axis, and each strip structure is along the Extending in the direction of the Y axis perpendicular to the X axis, each of the strip-like structures includes repeatedly arranged high microstructures and low microstructures with a height lower than the high microstructures.
  • Another technical means of the present invention is that the ratio of the number of the high microstructures to the low microstructures is equal to 1 in the direction along the X axis of each side area, which is far from the middle area.
  • Another technical means of the present invention is that a plurality of the strip-like structures in a convex shape are arranged on the light-exit side of the intermediate area of the optical film, and each of the strip-like structures in the intermediate area includes a repetitive arrangement The high microstructure and the low microstructure having a height lower than the high microstructure.
  • Another technical means of the present invention is that the ratio of the quantity of the high microstructure to the low microstructure in the middle region is equal to the ratio of the quantity of the high microstructure to the low microstructure in each side region, and both are equal to 1.
  • Another technical means of the present invention is that the ratio of the number of the high microstructures to the low microstructures gradually increases from the center of the middle area along the X axis toward the side area.
  • Another technical means of the present invention is that the number of the high microstructures in each side area does not exceed the number of the low microstructures at most.
  • Another technical means of the present invention is to define a centerline perpendicular to the vertex of any one of the low microstructures and a tangent line that passes through the vertex and is tangent to the adjacent high microstructures, the centerline and the tangent
  • the acute angle between is greater than or equal to 60 degrees.
  • Another technical means of the present invention is that a plurality of the strip-shaped structures are closely arranged.
  • Another object of the present invention is to provide a backlight module.
  • the backlight module of the present invention includes a light source, an optical plate for receiving the light source, a film set on the optical plate, and the aforementioned optical film set on the film set.
  • Another object of the present invention is to provide a display device.
  • the display device of the present invention includes the aforementioned backlight module and a display panel arranged on the backlight module, wherein the X axis is defined as the horizontal direction in which the user views the display panel, and the Y axis is defined as the user viewing The vertical direction of the display panel.
  • the effect of the present invention is that through the shape and arrangement of the strip structure on the optical film, the light with an excessively large angle can be refracted again, thereby improving the problem of large-angle light field and large-angle light leakage, and further improving the large-angle light field. Contrast of angular viewing angle.
  • FIG. 1 is a schematic side view showing a preferred embodiment of the backlight module of the present invention
  • FIG. 2 is a three-dimensional schematic diagram illustrating the structure of the optical film in FIG. 1;
  • Fig. 3 is a schematic side view of assistance in explaining Fig. 2;
  • Figure 4 is a graph illustrating the change in the ratio of the high microstructure to the low microstructure in the optical film
  • FIG. 5 is a partial enlarged schematic diagram illustrating the local structure of the high microstructure and the low microstructure
  • FIG. 6 is a schematic side view showing a preferred embodiment of the display device of the present invention.
  • FIG. 7 is a schematic diagram showing the angle when the user views the screen and a schematic diagram where the viewing surface and the light emitting surface are perpendicular to each other;
  • FIG. 8 is a schematic diagram showing the angle when the user views the screen and a schematic diagram where the viewing surface and the light emitting surface have an angle of 45 degrees;
  • Figure 9 illustrates that when ⁇ is 60 degrees, Curve graph of brightness percentage of different viewing angles in the case of 0 degrees;
  • Figure 10 illustrates that when ⁇ is 60 degrees, The curve graph of the brightness percentage of different viewing angles in the case of 45 degrees;
  • Figure 11 is a perspective schematic diagram illustrating another form of the optical film
  • Fig. 12 is a schematic side view of assistance in explaining Fig. 11;
  • FIG. 13 is a graph illustrating the change in the ratio of the high microstructure to the low microstructure in the optical film of FIG. 11.
  • a preferred embodiment of the backlight module of the present invention includes a light source 2, an optical plate 3 for receiving the light source 2, a film set 4 arranged on the optical plate 3, and a film set 4 ⁇ optical diaphragm5.
  • the film set 4 may include a brightness enhancement film, a prism film, and a diffusion film, but it is not limited thereto.
  • the backlight module is a direct type backlight module, so the light source 2 includes a plurality of light emitting diodes (LEDs) arranged in an array under the bottom surface of the optical plate 3, and the optical plate 3 is a diffuser plate.
  • LEDs light emitting diodes
  • the backlight module can also be designed as an edge-type backlight module, so the light source 2 includes a plurality of light emitting diodes (LEDs), which are arranged in a straight line at the side of the optical plate 3, and the optical plate 3 It is a light guide plate that allows the light emitted by the LED to enter the light guide plate through the side of the light guide plate, and then through the special structure of the light guide plate, destroy the total reflection path of the light in the light guide plate to produce a surface light source with uniform brightness distribution.
  • LEDs light emitting diodes
  • the optical film 5 includes a light incident side 51 and a light output side 52 opposite to the light incident side 51. Since the optical film 5 is located above the optical plate 3, the light entrance side 51 of the optical film 5 faces downward and faces the top surface (ie, the light exit surface) of the optical plate 3, and the light exit side 52 of the optical film 5 faces upward .
  • the optical film 5 can be divided into a middle area 53 and two side areas 54 located on both sides of the middle area 53 along the X-axis direction. Wherein, the light exit side 52 of each side area 54 is arranged with a plurality of strip-like structures 55 in a convex shape.
  • a plurality of strip-like structures 55 are arranged along the direction of the X-axis, and each strip-like structure 55 extends along the direction of the Y-axis perpendicular to the X-axis, and each strip-like structure 55 includes repeatedly arranged high microstructures 551 and The height of the low microstructure 552 is lower than that of the high microstructure 551. It should be particularly noted that the strip-like structures 55 are closely arranged with each other without gaps.
  • the number of high microstructures 551 in each side region 54 does not exceed the number of low microstructures 552 at most, and the light exit side 52 of the middle region 53 of the optical film 5 is also arranged to be convex.
  • both the high microstructures 551 and the low microstructures 552 are arc-shaped protruding strips, and the ratio of the number of the high microstructures 551 to the low microstructures 552 is along the center of the middle zone 53.
  • the direction of the X axis gradually increases toward the side regions 54 on both sides.
  • the ratio of the number of the high microstructures 551 to the low microstructures 552 is equal to 1 at the extreme end of each side region 54 away from the middle region 53 in the direction along the X axis.
  • a plurality of low microstructures 552 are repeatedly arranged, and then a high microstructure 551 is arranged on both sides of the low microstructure 552, and the number of repetitions of the low microstructures 552 is from the middle region 53 to the side regions on both sides. 54 gradually decreased.
  • a plurality of low microstructures 552 are repeatedly arranged, and then a high microstructure 551 is arranged on both sides of the plurality of low microstructures 552, and then the arrangement is continued toward both sides.
  • low microstructures 552 and one high microstructure 551 There are four low microstructures 552 and one high microstructure 551, and three low microstructures 552 and one high microstructure 551 are successively arranged towards the two sides respectively.
  • the number of repetitions of the low microstructures 552 is from the middle area 53 to the side areas 54 on both sides. Gradually decrease until the number of repetitions of the high microstructure 551 and the low microstructure 552 is the same, so that the ratio of the two numbers is equal to 1. Therefore, as shown in Figure 4, the ratio of the high microstructure 551 to the low microstructure 552 gradually rises from less than 1 to Equal to 1.
  • the height relationship between the high microstructure 551 and the low microstructure 552 will be described in detail.
  • a centerline L passing through the vertex of any low microstructure 552 and a tangent line T passing through the vertex and tangent to the adjacent high microstructure 551, and the angle between the centerline L and the tangent T For example, it is an acute angle greater than or equal to 60 degrees. In this embodiment, 60 degrees is taken as an example for description.
  • the acute angle between the center line L and the tangent T can be designed to be other angles, such as 70 degrees, so that when the light exits through the low microstructure 552, the light exiting angle is greater than 70 degrees, passing through the adjacent high The microstructure 551 refracts into the optical film 5 again.
  • a small number of high microstructures 551 and a large number of low microstructures 552 are provided on each side area 54, light can be emitted at a large angle through a part of the low microstructures 552 The light ray is refracted into the optical film 5 through the adjacent high microstructure 551. Since the two side regions 54 are prone to light leakage, a low microstructure 552 and a high microstructure 551 are designed at the end of the side region 54, that is, the ratio of the number of high microstructures 551 to low microstructures 552 is equal to 1.
  • each of the low microstructures 552 can be refracted into the optical film 5 to reduce the chance of direct light exit. Therefore, the case where the ratio of the number of the high microstructures 551 to the low microstructures 552 is equal to one is most suitable for application in the two side regions 54 where light leakage is prone to occur.
  • the backlight module of the present invention together with the display panel 6, forms a display device as shown in FIG. 6.
  • plane A represents the light-emitting surface of the display device, that is, the viewing surface of the user when using the display device
  • plane B is perpendicular to plane A, and is set to be when the user is facing the center C of plane A
  • the viewing angle ⁇ of the eye viewing center C is 0 degrees.
  • the X axis is defined as the horizontal direction in which the user views the display device
  • the Y axis is defined as the vertical direction in which the user views the display device.
  • Figure 7 define the angle between plane B and the horizontal plane as In Figure 7, Is 0 degrees, and in Figure 8, It is 45 degrees, which is used to simulate the reasonable angle range when the user actually looks at the four corners or other edges of the screen.
  • Figures 9 and 10 illustrate the brightness percentages corresponding to those detected in Figures 7 and 8.
  • the solid line represents the optical film 5 of the present invention is not used, and the dashed line represents the optical film 5 of the present invention.
  • Figure 9 When it is 0 degrees and Figure 10 When it is 45 degrees, the solid line part can be observed in the two large angle areas between plus 60 degrees and plus 90 degrees and between minus 60 degrees and minus 90 degrees (the optical film of the present invention is not used). 5) There is a more obvious brightness area (Figure 9 is 30%-40%, Figure 10 is 20%-30%), which means that there is light leakage when the viewing angle is large, and the dashed part (using the present invention The optical film 5) reduces the brightness to less than 20%, which means that the light leakage phenomenon has been improved when the viewing angle is large.
  • a part of the low microstructures 552 can emit light at a large angle.
  • the light ray can be refracted into the optical film 5 through the adjacent high microstructure 551. Since the light leakage at the two side areas 54 with larger viewing angles is more obvious than that of the middle area 53, the large angle of the side area 54 will easily exceed the user's viewing range, and the large angle of the middle area 53 will emit light. The light is still within the user’s viewing range.
  • the preferred embodiment adopts the method to allow the middle area 53 to emit light at a large angle, which can minimize the number of high microstructures 551 in the middle area 53 and only need to solve the two sides.
  • the side area 54 emits light at a large angle.
  • the number of high microstructures 551 is increased from the middle area 53 toward the two side areas 54 to make the low microstructures 552 of the two side areas 54 larger.
  • the angle-emitting light is refracted into the optical film 5 through the adjacent high-microstructure 551, thereby reducing the chance of direct light-emitting.
  • an optical film 5 of another form different from that of FIG. 2 is disclosed. No matter whether the optical film 5 is in the middle area 53 or the side area 54, the high microstructure 551 and the low microstructure 552 are both The same number is staggered, that is, the staggered arrangement is repeated in a way of one high and one low. If it is necessary to refract the light emitted from each low-microstructure 552 at a large angle into the optical film 5, the design scheme of repeatedly arranging a low-microstructure 552 with a high-microstructure 551 adjacent to it can be adopted, that is, a high-microstructure.
  • the number of structures 551 is at most equal to the number of low microstructures 552, and does not exceed the number of low microstructures 552.
  • the ratio of the number of high microstructures 551 and low microstructures 552 in the middle region 53 is equal to the ratio of the number of high microstructures 551 and low microstructures 552 in each side region 54, both of which are Equal to 1.
  • the optical film 5 is more convenient and more versatile when it is manufactured and cut.
  • the present invention can refract light with an excessively large angle again through the shape and arrangement of the strip structure 55 on the optical film 5, thereby improving the problem of large-angle light field and large-angle light leakage, and then Improve the contrast of the wide-angle viewing angle.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

一种光学膜片（5），包括入光侧（51）及与入光侧（51）相对的出光侧（52），光学膜片（5）沿着X轴的方向区隔成中间区（53）及分别位于中间区（53）的两侧的两个侧边区（54），其中，每一侧边区（54）的出光侧（52）排列有呈凸出状的多个条状结构（55），多个条状结构（55）沿着X轴的方向排列，并且每一条状结构（55）沿着垂直于X轴的Y轴的方向延伸，每一条状结构（55）包括重复排列的高微结构（551）与高度低于高微结构（551）的低微结构（552）。通过光学膜片（5）上的条状结构（55）的型态与排列方式，可以将过大角度的光线再次折射，由此改善大角度光场与大角度漏光的问题，进而提高大角度视角的对比度。还公开了包含这种光学膜片（5）的背光模组及显示装置。

Description

光学膜片、背光模组及显示装置 技术领域
本发明涉及光学元件，特别是涉及改善大角度漏光并提高大角度对比度的光学膜片、背光模组及显示装置。
背景技术
由于液晶显示面板并不具有发光的功能，故必须在液晶显示面板下方配置背光模组(backlight module)来提供面光源，以使液晶显示面板能够达到显示的目的。
一般而言，光源模组可区分为直下式光源模组与侧入式光源模组。以直下式光源模组为例，通常包括多个发光元件、用来将发光元件阵列的光集中出光至正向方向的反射片以及用以将出光光束的视角缩小、提升正向辉度值以及出光效率的多层光学膜片组。另一方面，以侧入式光源模组为例，其一般包括导光板、位于导光板下方的反射片、位于导光板的侧边的光源以及前述的多层光学膜片组。光源所发出的光束自位于导光板的侧边的入光面进入导光板后，会因全反射而被导引至整个导光板中。位于导光板底面的多个网点会破坏光的全反射，使光束自导光板的出光面射出，并由前述的多层光学膜片组提升正向辉度值以及出光效率，从而形成所需的面光源。
然而，无论是直下式光源模组或侧入式光源模组，当用户在观看屏幕的两侧区域时，屏幕越大，用户视角也会变得越大，造成越容易在屏幕的大视角区域处产生漏光，造成白雾，导致亮暗对比下降而影响画面质量。
发明内容
因此，本发明的目的在于提供一种可以提升屏幕两侧的大视角区域的亮暗对比的光学膜片。
本发明的光学膜片，包括入光侧及与该入光侧相对的出光侧，该光学膜片沿着X轴的方向区隔成中间区及分别位于该中间区的两侧的两个侧边区，其中，每一该侧边区的出光侧排列有呈凸出状的多个条状结构，多个条状结构沿着该X轴的方向排列，并每一该条状结构沿着垂直于该X轴的Y轴的方向延伸，每一该条状结构包括重复排列的高微结构与高度低于该高微结构的低微结构。
本发明的另一技术手段，在于该高微结构与该低微结构的数量比值在每一该侧边区的沿着该X轴的方向远离该中间区的最末端等于1。
本发明的另一技术手段，在于该光学膜片的该中间区的出光侧排列有呈凸出状的多个该条状结构，且该中间区内的每一该条状结构包括重复排列的该高微结构与高度低于该高微结构的该低微结构。
本发明的另一技术手段，在于该高微结构与该低微结构在该中间区内的数量比值等于该高微结构与该低微结构在每一该侧边区内的数量比值，两者皆等于1。
本发明的另一技术手段，在于该高微结构与该低微结构的数量比值由该中间区的中央沿着该X轴的方向朝向该侧边区渐增。
本发明的另一技术手段，在于每一该侧边区内的该高微结构的数量最多不会超过该低微结构的数量。
本发明的另一技术手段，在于定义一条垂直通过该低微结构中的任一者的顶点的中心线及一条通过该顶点且与相邻的高微结构相切的切线，该中心线与该切线之间的锐角大于等于60度。
本发明的另一技术手段，在于多个该条状结构紧密排列。
本发明的另一目的，在于提供一种背光模组。
本发明的背光模组，包含光源、用以接收该光源的光学板、设置于该光学板上的膜片组及设置于该膜片组上的如前所述的光学膜片。
本发明的另一目的，在于提供一种显示装置。
本发明的显示装置，包含如前所述的背光模组及设置于该背光模组上的显示面板，其中，该X轴定义为用户观看该显示面板的水平方向，该Y轴定义为用户观看该显示面板的垂直方向。
本发明的功效在于，通过该光学膜片上的条状结构的型态与排列方式，可以将过大角度的光线再次折射，由此改善大角度光场与大角度漏光的问题，进而提高大角度视角的对比度。
附图说明
图1是示出本发明的背光模组的较佳实施例的侧视示意图；
图2是说明图1中的光学膜片的结构的立体示意图；
图3是辅助说明图2的侧视示意图；
图4是说明光学膜片中的高微结构与低微结构的比值变化的曲线图；
图5是说明高微结构与低微结构的局部结构的局部放大示意图；
图6是示出本发明的显示装置的较佳实施例的侧视示意图；
图7是示出用户观看屏幕时的角度示意图及观赏面与出光面彼此垂直的示意图；
图8是示出用户观看屏幕时的角度示意图及观赏面与出光面具有夹角45度的示意图；
图9是说明在θ为60度、
Figure PCTCN2020086193-appb-000001
为0度的情况下不同视角的辉度百分比的曲线图；
图10是说明在θ为60度、
Figure PCTCN2020086193-appb-000002
为45度的情况下不同视角的辉度百分比的曲线图；
图11是说明光学膜片的另一种形态的立体示意图；
图12是辅助说明图11的侧视示意图；及
图13是说明图11的光学膜片中的高微结构与低微结构的比值变化的曲线图。
具体实施方式
本发明的相关申请专利特色与技术内容，在以下参考附图的较佳实施例的详细说明中，将可清楚地呈现。在进行详细说明之前，应注意的是，类似的元件以相同的编号来表示。
参阅图1，为本发明的背光模组的较佳实施例，包含光源2、用以接 收光源2的光学板3、设置于光学板3上的膜片组4及设置于膜片组4上的光学膜片5。其中，膜片组4可以包括增亮膜、棱镜片及扩散片，但并不以此为限。在本实施例中，背光模组为直下式背光模组，因此光源2包括多个发光二极管(LED)，其以阵列方式排列在光学板3的底面下方，并且光学板3是一片扩散板，使得以阵列方式排列的LED所发出的光线，通过扩散板本身的光学复合材料进行漫射，以产生亮度均匀分布的面光源。在其他实施例中，也可以将背光模组设计为侧入式背光模组，因此光源2包括多个发光二极管(LED)，其以直线方式排列在光学板3的侧面处，并且光学板3是一片导光板，使得LED所发出的光线经由导光板的侧面进入导光板中，再经由导光板上的特殊结构，破坏光线在导光板内的全反射路径，以产生亮度均匀分布的面光源。
参阅图2及图3，光学膜片5包括入光侧51及与入光侧51相对的出光侧52。由于光学膜片5位于光学板3的上方，因此，光学膜片5的入光侧51朝向下方而面向光学板3的顶面(即出光面)，光学膜片5的出光侧52则朝向上方。光学膜片5可以沿着X轴的方向区隔成中间区53及分别位于中间区53的两侧的两个侧边区54。其中，每一侧边区54的出光侧52排列有呈凸出状的多个条状结构55。多个条状结构55沿着X轴的方向排列，并且每个条状结构55沿着垂直于X轴的Y轴的方向延伸，且每个条状结构55包括重复排列的高微结构551与高度低于高微结构551的低微结构552。要特别说明的是，条状结构55之间紧密排列，彼此之间无间隙。
另外，在本实施例中，每一侧边区54内的高微结构551的数量最多不会超过低微结构552的数量，光学膜片5的中间区53的出光侧52同样排列有呈凸出状的多个条状结构55，且中间区53内的条状结构55包括少量的高微结构551与多量的低微结构552重复排列。也就是说，不论在中间区53或在侧边区54，高微结构551的数量最多不会超过低微结构552的数量。
要特别说明的是，在本实施例中，高微结构551与低微结构552皆为圆弧形突出的条状结构，高微结构551与低微结构552的数量比值由中间 区53的中央沿着X轴的方向朝向两侧的侧边区54渐增。高微结构551与低微结构552的数量比值在每一侧边区54的沿着X轴的方向远离中间区53的最末端等于1。也就是说，在中间区53内，多个低微结构552重复排列，低微结构552的两侧接着分别排列一个高微结构551，低微结构552的重复数量由中间区53朝向两侧的侧边区54逐渐减少。以图2及图3为例，在中间区53的中央处，多个低微结构552重复排列，接着在多个低微结构552的两侧分别排列一个高微结构551，再朝向两侧分别继续排列有四个低微结构552与一个高微结构551，更朝向两侧分别继续排列有三个低微结构552与一个高微结构551，低微结构552的重复数量由中间区53朝向两侧的侧边区54逐渐递减，一直到高微结构551与低微结构552的重复数量相同，以使两者数量比值等于1，因此如图4所示，高微结构551与低微结构552的比值由小于1逐渐上升至等于1。
接着，来详细说明高微结构551与低微结构552的高低关系。参阅图5，定义一条垂直通过任一低微结构552的顶点的中心线L及一条通过该顶点且与相邻的高微结构551相切的切线T，中心线L与切线T之间的夹角例如为大于等于60度的锐角。在本实施例中，以60度为例进行说明。通过上述结构设计，当光线经由低微结构552出光时，出光角度大于60度的光线会经由相邻的高微结构551再次折射进入光学膜片5中，由此降低直接出光的机会，进而减少大角度区域的出光量(辉度)。在其他实施例中，则可以将中心线L与切线T之间的锐角设计为其他角度，例如70度，以使经由低微结构552出光时的出光角度大于70度的光线，经由相邻的高微结构551再次折射进入光学膜片5中。
参阅图3及图5，以本较佳实施例来说，当每一侧边区54设置少量的高微结构551与多量的低微结构552时，可以使经由一部分的低微结构552而大角度出光的光线经由邻近的高微结构551折射进入光学膜片5中。由于两个侧边区54容易产生漏光现象，因此在侧边区54的最末端设计一个低微结构552搭配一个高微结构551，也就是使高微结构551与低微结构552的数量比值等于1，由此可以使经由每一个低微结构552而大角度出光的光线折射进入光学膜片5中，以降低直接出光的机会。因此， 高微结构551与低微结构552的数量比值等于1的情况最适合应用在容易产生漏光现象的两个侧边区54中。
本发明的背光模组，再加上显示面板6，即形成如图6所示的显示装置。
接着，来说明使用本发明的光学膜片5对于大角度出光的光线的影响。参阅图7，平面A代表显示装置的出光面，即使用者在使用显示装置时的观赏面，而平面B则垂直于平面A，并且设定为当使用者正对着平面A的中心C时，眼睛观看中心C的视角θ为0度。X轴定义为使用者观看显示装置的水平方向，Y轴定义为使用者观看显示装置的垂直方向。另外，定义平面B与水平面的夹角为
Figure PCTCN2020086193-appb-000003
在图7中，
Figure PCTCN2020086193-appb-000004
为0度，而在图8中，
Figure PCTCN2020086193-appb-000005
为45度，用以仿真用户实际观看屏幕的四个角落或其他边缘时的合理角度范围。图9及图10说明对应于图7及图8所检测到的辉度百分比，实线代表未使用本发明的光学膜片5，而虚线则代表使用了本发明的光学膜片5。
由图9及图10所示的检测结果可以看出，当使用了本发明的光学膜片5时，因为大角度出光的光线会被相邻的高微结构551(见图5)进行折射而减少直接出光的机会，因此可以减少视角为60度以上的区域的辉度，由此能够有效减少视角为60度以上的区域的漏光情形，从而减少显示装置两侧出现白雾的情形，进而提高视角为60度以上的区域的对比度。在图9的
Figure PCTCN2020086193-appb-000006
为0度时及图10的
Figure PCTCN2020086193-appb-000007
为45度时，在正60度与正90度之间以及负60度与负90度之间的两个视角的大角度区域中，可以观察到实线部分(未使用本发明的光学膜片5)存在着较明显的辉度区域(图9为30％-40％，图10为20％-30％)，这意味着视角在大角度时存在漏光现象，而虚线部分(使用了本发明的光学膜片5)将辉度下降到20％以下，这意味着视角在大角度时的漏光现象已经获得改善。
参阅图3及图5，以本较佳实施例来说，当每一侧边区54设置少量的高微结构551与多量的低微结构552时，即可以使一部分的低微结构552的大角度出光的光线能够经由邻近的高微结构551而折射进入光学膜片5中。由于视角较大的两个侧边区54处的漏光现象相较于中间区53更为明 显，侧边区54的大角度出光的光线容易超出使用者的观看范围，中间区53的大角度出光的光线仍在使用者的观看范围内，因此本较佳实施例采用的方式容许中间区53的大角度出光，可以使得中间区53的高微结构551的数量最少化，只需解决两个侧边区54大角度出光的问题，以渐进式的方式将高微结构551的数量由中间区53朝向两个侧边区54的方向递增，以使两个侧边区54的低微结构552的大角度出光的光线经由邻近的高微结构551而折射进入光学膜片5中，从而降低直接出光的机会。
参阅图11及图12，揭露了不同于图2的另一种形态的光学膜片5，光学膜片5不管在中间区53还是在侧边区54，高微结构551与低微结构552均以相同的数量交错排列，也就是以一高一低的方式重复交错排列。如果需要每一个低微结构552的大角度出光的光线都能折射进入光学膜片5中时，则可以采用这种重复排列一个低微结构552邻近设置一个高微结构551的设计方案，也就是高微结构551的数量最多等于低微结构552的数量，而不会超过低微结构552的数量。
也就是说，如图13所示，高微结构551与低微结构552在中间区53内的数量比值等于高微结构551与低微结构552在每一侧边区54内的数量比值，两者皆等于1。如此一来，除了同样可以达成再次折射大角度出光的光线的功效外，光学膜片5在制作完成进行裁切时更为方便，泛用性更高。
综上所述，本发明通过光学膜片5上的条状结构55的型态与排列方式，可以将过大角度的光线再次折射，由此改善大角度光场与大角度漏光的问题，进而提高大角度视角的对比度。
以上所述仅为本发明的较佳实施例，应当不能以此限定本发明的实施范围。即大凡依本发明的权利要求范围及说明书内容所作的简单的等效变化与修饰，皆仍属本发明的专利涵盖范围。
【附图标记列表】
2  光源
3  光学板
4  膜片组
5    光学膜片
51   入光侧
52   出光侧
53   中间区
54   侧边区
55   条状结构
551  高微结构
552  低微结构
6    显示面板
L    中心线
T    切线
θ   角度
Figure PCTCN2020086193-appb-000008
   角度

Claims (10)

  1. 一种光学膜片，包括入光侧及与所述入光侧相对的出光侧，所述光学膜片沿着X轴的方向区隔成中间区及分别位于所述中间区的两侧的两个侧边区，其中，每一所述侧边区的出光侧排列有呈凸出状的多个条状结构，多个所述条状结构沿着所述X轴的方向排列，并且每一所述条状结构沿着垂直于所述X轴的Y轴的方向延伸，每一所述条状结构包括重复排列的高微结构与高度低于所述高微结构的低微结构。
  2. 根据权利要求1所述的光学膜片，其中，所述高微结构与所述低微结构的数量比值在每一所述侧边区的沿着所述X轴的方向远离所述中间区的最末端等于1。
  3. 根据权利要求2所述的光学膜片，其中，所述光学膜片的所述中间区的出光侧排列有呈凸出状的多个所述条状结构，且所述中间区内的每一所述条状结构包括重复排列的所述高微结构与高度低于所述高微结构的所述低微结构。
  4. 根据权利要求3所述的光学膜片，其中，所述高微结构与所述低微结构位于所述中间区的数量比值等于所述高微结构与所述低微结构在每一所述侧边区内的数量比值，两者皆等于1。
  5. 根据权利要求3所述的光学膜片，其中，所述高微结构与所述低微结构的数量比值由所述中间区的中央沿着所述X轴的方向朝向所述侧边区渐增。
  6. 根据权利要求1所述的光学膜片，其中，每一所述侧边区内的所述高微结构的数量最多不会超过所述低微结构的数量。
  7. 根据权利要求1所述的光学膜片，其中，定义一条垂直通过任一所述低微结构的顶点的中心线，及一条通过所述顶点且与相邻的所述高微结构相切的切线，所述中心线与所述切线之间的锐角大于等于60度。
  8. 根据权利要求1所述的光学膜片，其中，多个所述条状结构紧密排列。
  9. 一种背光模组，包含光源、用以接收所述光源的光学板、设置于所述光学板上的膜片组及设置于所述膜片组上的根据权利要求1至8中任一项所述的光学膜片。
  10. 一种显示装置，包含根据权利要求9所述的背光模组及设置于所述背光模组上的显示面板，其中，所述X轴定义为用户观看所述显示面板的水平方向，所述Y轴定义为用户观看所述显示面板的垂直方向。
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