WO2021017587A1 - 调光膜片、背光模块及显示设备 - Google Patents

调光膜片、背光模块及显示设备 Download PDF

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Publication number
WO2021017587A1
WO2021017587A1 PCT/CN2020/091325 CN2020091325W WO2021017587A1 WO 2021017587 A1 WO2021017587 A1 WO 2021017587A1 CN 2020091325 W CN2020091325 W CN 2020091325W WO 2021017587 A1 WO2021017587 A1 WO 2021017587A1
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Prior art keywords
dimming
backlight module
layer
light
central area
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PCT/CN2020/091325
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English (en)
French (fr)
Inventor
钟元振
陈蔚轩
陈瑞麟
李品勋
黄瑞琳
苏益楠
Original Assignee
瑞仪光电(南京)有限公司
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Priority to JP2021534157A priority Critical patent/JP7301134B2/ja
Priority to KR1020217018394A priority patent/KR20220044431A/ko
Publication of WO2021017587A1 publication Critical patent/WO2021017587A1/zh

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    • 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
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • 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
    • G02B6/005—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
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements

Definitions

  • the invention relates to a dimming component, in particular to a dimming film applied to a direct type backlight module and a display device and its application.
  • a backlight module is mainly used to provide a backlight source for the display panel.
  • the backlight module of the current display device can be divided into a direct type and a side type according to its light incident mode.
  • the direct type backlight module provides the backlight source required by the display panel by arranging a light source in the housing, and combining with a combination of optical films such as a prism sheet and a diffuser sheet.
  • the following methods can be used to select the light source of the direct backlight module.
  • the color light emitting diode is used as the light source, and the blue light emitted by the blue light emitting diode can excite the quantum dot film to white light.
  • RGB LED monochromatic light-emitting diodes
  • a problem of uneven light mixing occurs near the periphery of the backlight module due to fewer light reflections or refractions, resulting in chromatic aberration of light near the periphery of the backlight module.
  • the object of the present invention is to provide a dimming film, a backlight module, and a display device, so as to improve the problem of uneven light mixing at the periphery of the current backlight module and cause color difference.
  • the dimming film proposed in the present invention is arranged between the color conversion layer of the direct type backlight module and the display panel, and the dimming film includes:
  • the substrate defines a central area and a peripheral area
  • At least one dimming layer with a colorant is disposed on the substrate, and the colorant content on the dimming layer decreases from the peripheral area toward the central area.
  • the dimming film includes two dimming layers, and the two dimming layers are respectively disposed on two opposite sides of the substrate.
  • the thickness of the dimming layer decreases from the outer edge of the peripheral area toward the central area.
  • the substrate defines a first direction and a second direction perpendicular to the first direction, a plurality of parallel rib-like structures are distributed on the dimming layer, and the plurality of rib-like structures extend along the first direction , And arranged along the second direction.
  • the distance between every two adjacent rib-like structures increases from opposite sides of the dimming layer toward the center of the central area.
  • each rib-like structure gradually decreases from its opposite sides toward the central direction.
  • each of the rib-shaped structures has a rib-shaped central area, and the rib-shaped central area is a plane.
  • each rib structure is an inverted V-shaped structure with a top edge, and the top edge is rounded.
  • the dimming layer is distributed in the peripheral area to form a plurality of microstructures, and the distribution density of the plurality of microstructures decreases from the outer edge of the peripheral area toward the center of the central area.
  • the size of every two adjacent microstructures decreases from the outer edge of the peripheral area toward the center of the central area.
  • the distance between every two adjacent microstructures increases from the outer edge of the peripheral area toward the center of the central area.
  • the light-adjusting layer is formed on the substrate by a colloid including a coloring material; or the light-adjusting layer is formed on the substrate in a manner of color printing.
  • the backlight module additionally proposed by the present invention includes:
  • the light source which is arranged in the housing;
  • a color conversion layer which is disposed in the housing and located on the front side of the light source;
  • the color material of the dimming film is the correcting color of the chromatic aberration of light emitted by the backlight module.
  • the backlight module includes at least one optical film, and the optical film is arranged on the front side of the dimming film.
  • the backlight module additionally proposed by the present invention includes:
  • the display panel is arranged on the front side of the backlight module.
  • the dimming film of the present invention mainly uses a dimming layer containing pigments on the substrate, and uses the structural change of the dimming layer to make the color content of the dimming layer from the peripheral area toward The central area decreases gradually, so that when the light emitted by the light source passes through the dimming layer of the dimming film, the color material in the dimming layer can achieve a dimming effect, thereby improving the The uniformity of light mixing at the periphery of the backlight module improves the overall optical taste of the backlight module.
  • FIG. 1 is a schematic side plan view of a first preferred embodiment of the dimming film of the present invention.
  • FIG. 2 is a schematic side plan view of a second preferred embodiment of the dimming film of the present invention.
  • Fig. 3 is a perspective view of a third preferred embodiment of the dimming film of the present invention.
  • Fig. 4 is a schematic cross-sectional view taken along line A-A in Fig. 3.
  • FIG. 5 is a schematic perspective view of the third preferred embodiment of the dimming film of the present invention with a plane formed on the rib structure.
  • Fig. 6 is a schematic side plan view of a fourth preferred embodiment of the dimming film of the present invention adopting a hemispherical microstructure.
  • FIG. 7 is a schematic side plan view of a fourth preferred embodiment of the dimming film of the present invention adopting pyramidal microstructures.
  • Fig. 8 is a schematic diagram of a fifth preferred embodiment of the dimming film of the present invention.
  • Fig. 9 is a schematic side sectional view of the backlight module of the present invention.
  • FIG. 10 is a schematic side sectional view of the display device of the present invention.
  • the substrate 11 includes a substrate 11 and at least one dimming layer 12 a to 12 e with a color material.
  • the substrate 11 defines a central area 13 and a peripheral area 14.
  • the central area 13 is surrounded by the peripheral area 14.
  • the dimming layers 12a-12d with pigments can be coated on the substrate 11 with a colloid (such as UV glue) containing pigments, and then the dimming layers 12a-12d can be formed with a suitable mold.
  • the color printing method can be selected, and the light-adjusting layer 12e is printed on the substrate 11 in a color-gradient manner.
  • the substrate 11 has two opposite side surfaces, and the dimming layers 12a-12e can be optionally arranged on at least one side surface of the substrate 11 or the dimming layers 12a-12e can be provided on both opposite sides.
  • the colorant content of the dimming layers 12a-12e decreases from the peripheral area 14 toward the central area 13.
  • the colorant concentration of the light-adjusting layers 12a-12e is homogeneous.
  • the method for adjusting the amount of colorant in the following embodiments of the present invention may be by changing the light-adjusting layers 12a-12e.
  • the color materials of the dimming layers 12a-12e are the correction colors of the color difference of the light emitted by the color conversion layer 23 of the backlight module. For example, if the color of the light is bluish, the corrective color of the color material is yellow.
  • the dimming layers 12a-12d can be changed by the thickness or spacing of the dimming layers 12a-12d.
  • the content of the colorant decreases from the peripheral area 14 toward the central area 13.
  • This method is mainly to coat the colorant-containing colloid (such as UV glue) on the substrate, and then use a suitable mold to apply the dimming layer 12a ⁇ 12d is formed on the substrate 11. Due to the fast curing speed of the UV glue, the drying time can be omitted and the production efficiency can be improved.
  • the colorant-containing colloid such as UV glue
  • the thickness of the dimming layer 12a decreases from the outer edge of the peripheral region 14 toward the central region 13.
  • the first preferred embodiment of the optical film 10 mainly changes the thickness of the dimming layer 12a, thereby increasing the amount of colorant that the light touches when passing through the peripheral area 14, thereby achieving fine adjustment of the central area 13 and the peripheral area. Zone 14 dimming effect.
  • the thickness of the dimming layer 12b decreases from the outer edge of the peripheral region 14 toward the central region 13.
  • the central area 13 can be a flat surface, and the color material content in the central area 13 is evenly distributed.
  • the second preferred embodiment of the dimming film 10 mainly changes the thickness of the dimming layer 12b, thereby improving light passing Compared with the central area 13, the content of the color material contacted by the peripheral area 14 can improve the dimming effect of the peripheral area 14 in the second preferred embodiment of the present invention.
  • the substrate 10 defines a first direction D1 and a second direction D2 perpendicular to the first direction D1.
  • a plurality of parallel rib-like structures 15 are distributed on the dimming layer 12c, and the rib-like structures 15 extend along the first direction D1 and are arranged along the second direction D2.
  • the thickness of the opposite sides of the rib structure 15 decreases from the outer edge of the peripheral area 14 toward the center of the central area 13.
  • the pitch of every two adjacent rib-like structures 15 increases from the opposite sides of the substrate 11 in the second direction D2 toward the center of the substrate 11.
  • the third preferred embodiment of the dimming film 10 can further fine-tune the central area 13 through the thickness of the rib-like structure 15 on the dimming layer 12c and the change in the distance between adjacent rib-like structures 15 And the colorant content of the peripheral area 14 to achieve the dimming effect of fine-tuning the central area 13 and the peripheral area 14.
  • each rib-shaped structure 15 has a rib-shaped central area 151, and the rib-shaped central area 151 is a plane 152; or, each rib-shaped structure 15 is an inverted V-shaped structure, and its top edge is rounded.
  • the design of the flat surface 152 or the rounded top edge can prevent the rib structure 15 from scratching other diaphragms.
  • the dimming layer 12d is distributed in the peripheral area 14 to form a plurality of microstructures 17a, 17b, for example,
  • the microstructures 17a, 17b may be hemispherical or pyramidal.
  • the distribution density of the plurality of microstructures 17a, 17b decreases from the outer edge of the peripheral region 14 toward the center of the central region 13. In this embodiment, the distance between every two adjacent microstructures 17a, 17b is The outer edge of the peripheral area 14 increases toward the center of the central area 13.
  • the change in the size of each microstructure 17 and the distance between adjacent microstructures 17 can further fine-tune the central area 13 and the peripheral area 14
  • the difference in the content of the colorant can further achieve the fine adjustment of the dimming effect of the central area 13 and the peripheral area 14, so as to reduce the color difference between the central area 13 and the peripheral area 14.
  • the pitch change method may not be used, but the size of every two adjacent microstructures 17a, 17b can be moved from the outer edge of the peripheral region 14 toward the center of the central region 13.
  • the difference in colorant content of the central area 13 and the peripheral area 14 can also be further fine-tuned, so as to fine-tune the dimming effect of the central area 13 and the peripheral area 14 to reduce the central area 13
  • the color difference with the peripheral area 14 is different.
  • the light-adjusting layer 12e is printed in a color-graded manner on the optical film 24.
  • the dimming layer of this embodiment can use screen printing to plan the arrangement density of the mesh or the size of the mesh, so that the amount of colorant per unit area gradually decreases from the peripheral area to the central area.
  • the gradual distribution of the printed dots or the change in the size of the printed dots of the same concentration of colorant can improve the color difference problem of uneven light mixing at the periphery and improve the overall backlight module Optical taste.
  • This method is mainly performed by screen printing, which not only costs less, but also has the advantages of timeliness of revision or shorter process time.
  • FIG. 9 is a preferred embodiment of the backlight module 20 of the present invention, which includes a housing 21, a light source 22, a color conversion layer 23 and the dimming film 10 as described above.
  • the light source 22 is arranged in the housing 21.
  • the light source 22 can be selected as blue light emitting diodes, preferably arranged in a matrix in the housing 21.
  • the color conversion layer 23 is disposed in the housing 21 and is located on the front side of the light source 22.
  • the color conversion layer 23 has two opposite sides. One side facing the light source 22 is a light-incident surface, and the other side is a light-emitting surface.
  • the color conversion layer 23 is used to convert the light of the light source 22 into the desired color light.
  • the light source 22 is selected as a blue light emitting diode, and the color conversion layer 23 can be selected as a quantum dot film, which can be excited by blue light. And emit white light.
  • the dimming film 10 is disposed on the front side of the color conversion layer 23, the dimming film 10 is disposed on the light-emitting surface of the color conversion layer 23, and the color material of the dimming film 10 passes through the backlight module 20
  • the color material in the dimming film 10 must be selected as the correction color of the deviation light. In this embodiment, it is a yellow color material. , By using the slight color difference to achieve better light mixing uniformity, and improve the overall optical taste of the backlight module.
  • the backlight module 20 includes at least one optical film 24, the optical film 24 is arranged on the front side of the dimming film 10, the optical film 24 may include a prism film, a diffusion film, etc., the number of which is And the order of display can be determined according to requirements. More preferably, the bottom surface of the optical film 24 includes the arrangement of the aforementioned dimming film 10, that is, the substrate 11 may be an optical film with better light transmittance, such as a prism film or a brightness enhancement film. The bottom surface of the optical film is provided with light-adjusting layers 12a-12e. Referring to Figures 1-7, the light-adjusting layers 12a-12d can be coated with the aforementioned colored colloid (such as UV glue) and then formed by a suitable mold.
  • the aforementioned colored colloid such as UV glue
  • the dimming layer 12e can also be printed in the above color, and the color material is printed on the bottom surface of the optical film 24 in a gradual manner.
  • the color material is selected as yellow, and the concentration of the printed yellow pigment decreases from the peripheral area 14 toward the central area 13.
  • FIG. 10 is a preferred embodiment of the display device 30 of the present invention, which includes the aforementioned backlight module 20 and a display panel 31 disposed on the front side of the backlight module 20.
  • the dimming film 10 of the present invention mainly consists of arranging the dimming layers 12a-12e containing pigments on the substrate 11, and using the structural changes in the thickness or spacing of the dimming layers 12a-12e;
  • the color material content of the light-adjusting layers 12a-12e may decrease from the peripheral area 14 toward the central area 13.
  • the color material content of the peripheral area 14 and the central area 13 may The content difference allows the light emitted by the light source 22 to pass through the dimming layers 12a-12e of the dimming film 10, and the color materials in the dimming layers 12a-12e can be used to achieve the dimming effect.
  • the uniformity of light mixing at the periphery of the backlight module 20 is improved, and the overall optical taste of the backlight module 20 is improved.

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  • General Physics & Mathematics (AREA)
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Abstract

一种调光膜片（10）、背光模块（20）及显示设备（30），调光膜片（10）设置于背光模块（20）的色彩转换层（23）前侧，并位于显示设备（30）的显示面板（31）后侧，调光膜片（10）包括基板（11）及至少一个具有色料的调光层（12a~12e），调光层（12a~12e）设置于基板（11）上，且调光层（12a~12e）上界定有中央区（13）及外围区（14），调光层（12a~12e）的色料含量自外围区（14）朝向中央区（13）递减，并利用调光层（12a~12e）的结构变化，藉此使光源（22）发出的光线能在通过调光膜片（10）的调光层（12a~12e）时，能利用调光层（12a~12e）内的色料达到调光的效果，进而能提高背光模块（20）的周缘处的混光均匀度，提高背光模块（20）的整体光学品味。

Description

调光膜片、背光模块及显示设备 技术领域
本发明涉及一种调光组件，特别是涉及应用于直下式的背光模块及显示设备的调光膜片及其应用。
背景技术
现有的显示设备中，主要利用背光模块对显示面板提供背光源。目前的显示设备的背光模块能依照其入光方式区分成直下式及侧入式。其中，直下式背光模块通过在外壳内设置光源，并搭配棱镜片、扩散片等光学膜片的组合，以提供显示面板所需的背光源。
直下式背光模块的光源选择可采用以下几种方法。以红、绿、蓝单色发光二极管(RGB LED)作为光源，并藉由让光线在通过所述光学膜片时产生漫射、反射或折射，以完成混光而成白光；或者，以蓝色发光二极管作为光源，所述蓝色发光二极管所发出的蓝光可将量子点薄膜激发出白光。然而在邻近所述背光模块的周缘处会因为光线反射或折射的次数较少，而发生混光不均的问题，导致邻近所述背光模块周缘处的光发生色差的情形。
因此，要如何避免背光模块的周缘处发生混光不均而导致色差的问题，实乃现今厂商急需解决的问题。
发明内容
因此，本发明目的是提供一种调光膜片、背光模块及显示设备，希藉此改善现今的背光模块周缘处发生混光不均而导致色差的问题。
为实现前述目的，本发明所提出的调光膜片设置于直下式背光模块的色彩转换层及显示面板之间，该调光膜片包括：
基板，界定有中央区及外围区；以及
至少一个具有色料的调光层，其设置于该基板上，所述调光层上的色料含量自所述外围区朝向所述中央区方向递减。
其中，所述调光膜片包括两个所述调光层，该两个所述调光层分别设置于该基板的相对两个侧面。
其中，所述调光层的厚度自该外围区的外缘朝该中央区方向递减。
其中，所述基板界定有第一方向及与该第一方向垂直的第二方向，所述调光层上分布有多数平行的肋状结构，所述多数肋状结构沿所述第一方向延伸，并沿所述第二方向排列。
其中，每两个相邻的肋状结构的间距自该调光层的相对两侧朝该中央区的中央方向递增。
其中，所述每一个肋状结构的厚度自其相对两侧朝向中央方向递减。
其中，所述每一个肋状结构具有肋状中央区，该肋状中央区为平面。
其中，每一个肋状结构为倒V型结构，具有顶缘，且该顶缘为圆角。
其中，所述调光层于所述外围区分布形成多数微结构，该多数微结构的分布密度自该外围区的外缘朝该中央区的中央方向递减。
其中，每两个相邻的微结构的尺寸自该外围区的外缘朝该中央区的中央方向递减。
其中，每两个相邻的微结构的间距自该外围区的外缘朝该中央区的中央方向递增。
其中，所述调光层以包括有色料的胶体成形于所述基板上；或是所述调光层以上色印刷的方式成形于所述基板上。
为实现前述目的，本发明另外提出的背光模块包括：
外壳；
光源，其设置于该外壳内；
色彩转换层，其设置于该外壳内并位于该光源的前侧；以及
如前述的调光膜片，其设置于该色彩转换层前侧，所述调光膜片的色料是背光模块所发出光线色差的补正颜色。
其中，该背光模块包括至少一个光学膜片，所述光学膜片设置于该调光膜片的前侧。
为实现前述目的，本发明另外提出的背光模块包括：
如前述的背光模块；以及
显示面板，其设置于该背光模块的前侧。
本发明调光膜片主要藉由在所述基板上设置含有色料的调光层，并利用所述调光层的结构变化，使所述调光层的色料含量自所述外围区朝向所述中央区递减，藉此使光源发出的光线能在通过所述调光膜片的调光层时，能利用所述调光层内的色料达到调光的效果，进而能提高所述背光模块的周缘处的混光均匀度，提高背光模块的整体光学品味。
附图说明
图1是本发明的调光膜片的第一种较佳实施例的侧视平面示意图。
图2是本发明的调光膜片的第二种较佳实施例的侧视平面示意图。
图3是本发明的调光膜片的第三种较佳实施例的立体外观示意图。
图4是图3的A-A剖面示意图。
图5是本发明的调光膜片的第三种较佳实施例的肋状结构上形成平面的立体外观示意图。
图6是本发明的调光膜片的第四种较佳实施例的采用半球形微结构的侧视平面示意图。
图7是本发明的调光膜片的第四种较佳实施例的采用角锥形微结构的侧视平面示意图。
图8是本发明的调光膜片的第五种较佳实施例的示意图。
图9是本发明的背光模块的侧视剖面示意图。
图10是本发明的显示设备的侧视剖面示意图。
具体实施方式
参阅图1至图10，为本发明的调光膜片10的数种较佳实施例，其设置于直下式背光模块20的色彩转换层23及显示面板31之间，该调光膜片10包括基板11及至少一个具有色料的调光层12a～12e，所述基板11上界定有中央区13及外围区14，所述中央区13被所述外围区14所环绕。举例来说，所 述具有色料的调光层12a～12d可以选择以含有色料的胶体(例如UV胶)涂布于该基板11上，再以适当模具将该调光层12a～12d成形于该基板11上之外；亦能如图8所示，选择以上色印刷的方式，将该调光层12e以色料渐层方式印刷于该基板11。
其中，所述基板11具有相对两个侧面，所述调光层12a～12e可选择设置于该基板11的至少一个侧面上或者相对两个侧面都设有所述调光层12a～12e。
其中，所述调光层12a～12e的色料含量自所述外围区14朝向所述中央区13递减。更详细而言，所述调光层12a～12e的色料浓度是均质的(homogeneous)，本发明后述实施例所调整色料量的手段可以是借由改变调光层12a～12e的厚度、肋状结构的间距、微结构17a、17b的尺寸或微结构17a、17b的排列密度等方式。根据所述单位面积靠近外围区14或中央区13的位置，所述单位面积的色料量由外围区14朝向中央区13递减。
所述调光层12a～12e的色料是通过所述背光模块的色彩转换层23所发出光线色差的补正颜色。举例而言，若光线颜色偏蓝色，则色料的选用补正色为黄色。于本发明调光膜片10的第一种至第四种较佳实施例中，所述调光层12a～12d能藉由其厚度或间距等结构变化，使所述调光层12a～12d的色料含量自所述外围区14朝向所述中央区13递减，此方式主要是以含有色料的胶体(例如UV胶)涂布于基板后，再以适当模具将该调光层12a～12d成形于该基板11。由于UV胶的固化速度快，可以省去待干时程，提高生产效率。以下分别针对各实施例进行说明。
如图1所示，于本发明调光膜片10的第一种较佳实施例中，所述调光层12a的厚度自该外围区14的外缘朝该中央区13方向递减，该调光膜片10的第一种较佳实施例主要通过所述调光层12a的厚度变化，藉此提高光线通过所述外围区14时所接触的色料含量，进而达到微调中央区13与外围区14调光效果。
如图2所示，于本发明调光膜片10的第二种较佳实施例中，所述调光层12b的厚度自该外围区14的外缘朝该中央区13方向递减，所述中央区13可以为平整表面，所述中央区13色料含量均匀分布，该调光膜片10的第二 种较佳实施例主要通过所述调光层12b的厚度变化，藉此提高光线通过所述外围区14时所接触的色料含量，相对于所述中央区13，本发明的第二种较佳实施例具有提高所述外围区14的调光效果。
如图3所示，于本发明调光膜片10的第三种较佳实施例中，所述基板10界定有第一方向D1及与该第一方向D1垂直的第二方向D2，所述调光层12c上分布有多数平行的肋状结构15，所述肋状结构15沿第一方向D1延伸，并沿所述第二方向D2排列。
其中，如图4所示，所述肋状结构15相对两侧厚度自该外围区14的外缘朝该中央区13的中央方向递减。除此之外，如图3所示，每两个相邻的肋状结构15的间距自所述基板11于所述第二方向D2的相对两侧朝所述基板11的中央处方向递增，该调光膜片10的第三种较佳实施例主要通过所述调光层12c上的肋状结构15本身厚度搭配相邻的肋状结构15的间距变化，能进一步微调所述中央区13和所述外围区14的色料含量，进而达到微调所述中央区13和所述外围区14的调光效果。
另外，在不影响光学品味的前提下，可如图5所示，每一个肋状结构15具有肋状中央区151，该肋状中央区151为平面152；亦或是，每一个肋状结构15为倒V型结构，其顶缘作圆角处理，该平面152或是圆角顶缘的设计，均能藉此避免所述肋状结构15刮伤其他膜片。
如图6、图7所示，于本发明调光膜片10的第四种较佳实施例中，所述调光层12d于所述外围区14分布形成多数微结构17a、17b，举例而言，所述微结构17a、17b可以为半球形或是角锥形。该多数微结构17a、17b的分布密度自该外围区14的外缘朝该中央区13的中央方向递减，以本实施例来说，每两个相邻的微结构17a、17b的间距自该外围区14的外缘朝该中央区13的中央方向递增，通过每一个微结构17的尺寸变化及相邻的微结构17的间距变化，能进一步微调所述中央区13和所述外围区14的色料含量差异，进而达到微调所述中央区13和所述外围区14的调光效果，以降低所述中央区13与所述外围区14的色差差异。另外，在其他实施例中，也可以不采用间距变化的方式，而是采用每两个相邻的微结构17a、17b的尺寸能自该外围区14的外缘朝该中央区13的中央方向递减，同样也可以进一步微调所述 中央区13和所述外围区14的色料含量差异，进而达到微调所述中央区13和所述外围区14的调光效果，以降低所述中央区13与所述外围区14的色差差异。
如图8所示，于本发明调光膜片10的第五种较佳实施例中，该调光层12e以上色印刷的方式，将色料以渐层方式印刷于所述光学膜片24的底面，其中，所述调光层12e的色料含量自所述调光膜片10的外围朝内渐减，且所述调光层12e于中央区13不印刷色料。更详细而言，本实施例的调光层可以利用网版印刷(screen printing)方式，规划网孔的排列密度或网孔大小，使单位面积的色料量从外围区朝中央区逐渐递减，如此，纵使调光层厚度并无改变，而是借由同一浓度的色料的印刷点渐层分布或印刷点尺寸变化，达到改善周边处混光不均的色差问题，以提高背光模块的整体光学品味。此方式主要是以网版印刷的方式进行，不仅花费成本较低，且具有改版时效性或制程时间较短的优势。
另参阅图9，为本发明背光模块20的一种较佳实施例，其包括外壳21、光源22、色彩转换层23及如前述的调光膜片10。
该光源22设置于该外壳21内。举例而言，所述光源22可选择为蓝光发光二极管，较佳是呈矩阵排列于该外壳21内。
该色彩转换层23设置于该外壳21内并位于该光源22的前侧，该色彩转换层23具有相对两面，朝向该光源22的一面为入光面，另一面为发光面。该色彩转换层23用以将所述光源22的光线转换为所需色光，举例而言，所述光源22选择为蓝光发光二极管，该色彩转换层23可选择为量子点薄膜，可受到蓝光激发而发出白色光线。
该调光膜片10设置于该色彩转换层23前侧，该调光膜片10设于该色彩转换层23的发光面上，其中所述调光膜片10的色料是通过背光模块20的色彩转换层12的发光面所发出光线色差的补正颜色。举例而言，如前述光源22选择为蓝光发光二极管，并经由该色彩转换层23将光线转换为所需色光后，所述中央区13与所述外围区14的色差差异，一般而言，前述色差差异通常是由于混光效果不足，而导致所需色光仍偏蓝光，此时该调光膜片10中的色料则必须选用偏差光线的补正颜色，以本实施例而言为黄色色料， 藉以微调色差而达到较佳的混光均匀度，并提高背光模块整体的光学品味。
此外，该背光模块20包括至少一个光学膜片24，所述光学膜片24设置于该调光膜片10的前侧，所述光学膜片24可以包括有棱镜片、扩散片等，其数量和摆设顺序可依照需求而定。更佳的是，所述光学膜片24的底面包括前述调光膜片10的设置，即所述基板11可以是透光性较佳的光学膜片，例如棱镜片或增亮膜，所述光学膜片底面设有调光层12a～12e，参阅图1～7，该调光层12a～12d可以选择以前述包括有色料的胶体(例如UV胶)涂布于上再以适当模具成形之外，或是参阅图8，该调光层12e也可以选择以上色印刷的方式，将色料以渐层方式印刷于所述光学膜片24的底面。举例而言，当所述光源22为蓝光发光二极管时，则所述色料选择为黄色，而印刷黄色颜料的浓度自所述外围区14朝向所述中央区13递减。
另参阅图10，为本发明显示设备30的一种较佳实施例，其包括如前述的背光模块20及设置于该背光模块20前侧的显示面板31。
综上所述，本发明调光膜片10主要藉由在所述基板11上设置含有色料的调光层12a～12e，并利用所述调光层12a～12e厚度或间距的结构变化；亦或是采用渐层印刷的方式，使所述调光层12a～12e的色料含量自所述外围区14朝向所述中央区13递减，藉由外围区14与中央区13的单位色料含量差异，使光源22发出的光线能在通过所述调光膜片10的调光层12a～12e时，能利用所述调光层12a～12e内的色料达到调光的效果，进而能提高所述背光模块20的周缘处的混光均匀度，并提高背光模块20的整体光学品味。
符号说明
10调光膜片                 11基板
12a～12e调光层             13中央区
14外围区                   15肋状结构
17a、17b微结构             20背光模块
21外壳                     22光源
23色彩转换层               24光学膜片
30显示设备                 31显示面板
D1第一方向                 D2第二方向

Claims (16)

  1. 一种调光膜片，其特征在于设置于直下式背光模块的色彩转换层及显示面板之间，所述调光膜片包括：
    基板，界定有中央区及外围区；以及
    至少一个具有色料的调光层，其设置于所述基板上，所述调光层上的色料含量自所述外围区朝向所述中央区方向递减。
  2. 根据权利要求1所述的调光膜片，其特征在于，所述调光膜片包括两个所述调光层，所述两个所述调光层分别设置于所述基板的相对两个侧面。
  3. 根据权利要求1或2所述的调光膜片，其特征在于，所述调光层的厚度自所述外围区的外缘朝所述中央区的中央方向递减。
  4. 根据权利要求1或2所述的调光膜片，其特征在于，所述基板界定有第一方向及与所述第一方向垂直的第二方向，所述调光层上分布有多数平行的肋状结构，所述多数肋状结构沿所述第一方向延伸，并沿所述第二方向排列。
  5. 根据权利要求4所述的调光膜片，其特征在于，每两个相邻的肋状结构的间距自所述调光层的相对两侧朝所述中央区的中央方向递增。
  6. 根据权利要求4所述的调光膜片，其特征在于，所述每一个肋状结构的厚度自其相对两侧朝向中央方向递减。
  7. 根据权利要求6所述的调光膜片，其特征在于，所述每一个肋状结构具有肋状中央区，所述肋状中央区为平面。
  8. 根据权利要求6所述的调光膜片，其特征在于，每一个肋状结构为倒V型结构，具有顶缘，且所述顶缘为圆角。
  9. 根据权利要求1或2所述的调光膜片，其特征在于，所述调光层于所述外围区分布形成多数微结构，所述多数微结构的分布密度自所述外围区的外缘朝所述中央区的中央方向递减。
  10. 根据权利要求9所述的调光膜片，其特征在于，每两个相邻的微结构的尺寸自所述外围区的外缘朝所述中央区的中央方向递减。
  11. 根据权利要求9所述的调光膜片，其特征在于，每两个相邻的微结构的间距自所述外围区的外缘朝所述中央区的中央方向递增。
  12. 根据权利要求1或2所述的调光膜片，其特征在于，所述调光层以包括有色料的胶体成形于所述基板上。
  13. 根据权利要求1或2所述的调光膜片，其特征在于，所述调光层以渐层上色印刷的方式成形于所述基板上。
  14. 一种背光模块，其特征在于包括：
    外壳；
    光源，其设置于所述外壳内；
    色彩转换层，其设置于所述外壳内并位于所述光源的前侧；以及
    根据权利要求1至13中任一项所述的调光膜片，其设置于所述色彩转换层前侧，所述调光膜片的色料是背光模块所发出光线色差的补正颜色。
  15. 根据权利要求14所述的背光模块，其特征在于，所述背光模块包括至少一个光学膜片，所述光学膜片设置于所述调光膜片的前侧。
  16. 一种显示设备，其特征在于包括：
    根据权利要求14或15所述的背光模块；以及
    显示面板，其设置于所述背光模块的前侧。
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