WO2016197586A1 - 量子点增强薄膜和背光模块及显示设备 - Google Patents

量子点增强薄膜和背光模块及显示设备 Download PDF

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Publication number
WO2016197586A1
WO2016197586A1 PCT/CN2015/099784 CN2015099784W WO2016197586A1 WO 2016197586 A1 WO2016197586 A1 WO 2016197586A1 CN 2015099784 W CN2015099784 W CN 2015099784W WO 2016197586 A1 WO2016197586 A1 WO 2016197586A1
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Prior art keywords
quantum dot
backlight module
edge
film
light
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PCT/CN2015/099784
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English (en)
French (fr)
Inventor
赖俊豪
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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Priority to US15/291,118 priority Critical patent/US10042108B2/en
Publication of WO2016197586A1 publication Critical patent/WO2016197586A1/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
    • 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
    • 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
    • G02F1/133605—Direct backlight including specially adapted 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
    • 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
    • G02B6/0031—Reflecting 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
    • G02B6/0035—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
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Definitions

  • the invention relates to a backlight module, in particular to a quantum dot reinforced film, a backlight module and a display device capable of improving the phenomenon of chromatic aberration on the display edge.
  • Quantum Dot Enhancement Film is an optical component currently used in backlight modules to make the color of the display more precise.
  • the principle is to install a considerable number of two kinds of quantum dots on the film, and use blue light as the backlight source.
  • the blue light When the blue light is irradiated to two kinds of quantum dots, it will be converted into red light and green light respectively, and the generated red light and green light will be generated.
  • Color mixing with blue light is white light. By changing the ratio of converting blue light to red light and green light, the color mixing effect can be closer to the actual color, thus making the display color more precise.
  • a conventional backlight module 1 includes a back plate 11 , a plastic frame 12 connected to the back plate 11 and surrounding the receiving space 10 together with the back plate 11 , and is disposed on the back cover 11 a light guide plate 13 in the accommodating space 10, a quantum dot reinforced film 14 disposed on the bottom surface of the light guide plate 13 and located in the accommodating space 10, a light source (not shown) disposed in the accommodating space 10, and A reflector 15 around the light guide plate 13 and a plurality of optical films 17 stacked on the light guide plate 13 are stacked on each other. The light emitted by the light source of the backlight module 1 is transmitted through the light guide plate 13.
  • the light rays have a chance to penetrate the quantum dot enhancement film 14 from the light guide plate 13.
  • the quantum dot enhancement film 14 is reflected and penetrated again, and the light passes through the quantum dot enhancement film 14 through multiple refractions, and the complementary light is generated by the light mixing, and then passes through the plurality of optical films 17.
  • the light passes through the light guide plate 13 and is reflected by the reflection member 15, it returns to the light guide plate 13, and is refracted again to penetrate the quantum dot enhancement film 14 to generate correcting light.
  • the energy of the correcting light is sufficient or not depending on the number of times the light is refracted through the quantum dot enhancement film 14, if The more times you pass, the more the excitation will be, so that the energy of the correcting light is more sufficient to present a precise color.
  • the quantum dot enhancement film of the present invention has a reference edge, a surrounding edge connected to the reference edge, and a microstructured region adjacent to the surrounding edge.
  • Another object of the present invention is to provide a backlight module that can achieve high color saturation and can improve display edge chromatic aberration.
  • the backlight module of the present invention includes a housing unit having an accommodating space, a light source disposed in the accommodating space, a light guide plate mounted in the accommodating space, and a quantum dot reinforced film.
  • the light guide plate has a light incident side facing the light source, and a surrounding edge connecting the light entrance edge and the light entrance edge to form an edge of the light guide plate.
  • the quantum dot reinforced film is overlapped with the light guide plate and located in the accommodating space, and the quantum dot reinforced film is formed with a microstructured region adjacent to the surrounding edge.
  • the display device of the present invention includes the backlight module, the plurality of optical films, and the liquid crystal panel, wherein the light guide plate of the backlight module has a light emitting surface, and the optical film and the liquid crystal panel are sequentially stacked. On the light emitting surface of the light guide plate.
  • the effect of the invention is that by the arrangement of the microstructure region, the light can be reflected, and then the quantum dot enhancement film can be passed again, and the number of times the light passes through the quantum dot enhancement film is increased, so that the position at the edge of the light guide plate can also be excited.
  • Sufficient correction light providing high color saturation and solving the problem of blue edges or blues around the light-emitting area of the backlight module.
  • FIG. 1 is a schematic view showing a conventional backlight module
  • Figure 2 is a partial schematic view, with assistance for explaining Figure 1;
  • FIG. 3 is a schematic view showing a first embodiment of the quantum dot reinforced film and backlight module of the present invention
  • Figure 4 is a partial schematic view, assistance to illustrate Figure 3;
  • Figure 5 is a schematic view, assistance to explain Figure 3, showing the cross-sectional shape of the plurality of first microstructures of the quantum dot reinforced film is R-type;
  • FIG. 6 is a top plan view, and FIG. 3 and FIG. 5 are assisted to illustrate that the plurality of first microstructures are elongated or elongated regardless of the cross-sectional shape of the plurality of first microstructures;
  • FIG. 7 is a top plan view showing a plan view of the quantum dot reinforced film, and the plurality of first microstructures are hemispherical;
  • Figure 8 is a schematic view showing that the arrangement density of the plurality of first microstructures is closer to the surrounding edge of the light guide plate;
  • Figure 9 is a schematic view showing that the depth or height of the plurality of first microstructures is deeper or higher toward the surrounding edge;
  • Figure 10 is a schematic diagram showing that the slope of the plurality of first microstructures is closer to the surrounding edge
  • Figure 11 is a schematic view showing a second embodiment of the quantum dot reinforced film and backlight module of the present invention.
  • Figure 12 is a partial schematic view, with assistance to illustrate Figure 11;
  • Figure 13 is a schematic view showing a third embodiment of the quantum dot reinforced film and backlight module of the present invention.
  • Figure 14 is a schematic view showing a fourth embodiment of the quantum dot reinforced film and backlight module of the present invention.
  • Figure 15 is a color difference comparison diagram illustrating color difference data measured by the display device of the present invention on a side opposite to the surrounding side of the light guide plate;
  • Figure 16 is a color difference comparison diagram illustrating the color difference data measured by the display device of the present invention on the surrounding side of the light guide plate.
  • the quantum dot enhancement film 24 has a reference edge 245, a surrounding edge 246 connected to the reference edge 245, The introduction surface 241, the optical surface 242 opposite to the introduction surface 241, the microstructure region 243 located on the optical surface 242 adjacent to the surrounding edge, and the plurality of first microstructures 244 located in the microstructure region 243.
  • the cross-sectional shape of each of the first microstructures 244 is V-shaped, but is not limited thereto.
  • the cross-sectional shape of each of the first microstructures 244 may also be the R-type shown in FIG.
  • the plurality of first microstructures 244 When the cross-sectional shape of the plurality of first microstructures 244 is V-shaped or R-shaped, both of them are elongated as shown in FIG. 6; in addition, the plurality of first microstructures 244 may also be The hemispherical shape is presented, and the planar state of the microstructured region 235 exhibits a dot shape as shown in FIG. Alternatively, the microstructured region 235 can be a rough surface.
  • the backlight module 2 includes a housing unit 21 having an accommodating space 210 , a light source 22 disposed in the accommodating space 210 , and a light guide plate 23 mounted in the accommodating space 210 . And the quantum dot reinforced film 24 as described above. In addition, the backlight module 2 further includes a reflector 25 disposed around the light guide plate 23.
  • the housing unit 21 includes a back plate 211 and a frame 212 disposed around the periphery of the back plate 211.
  • the frame 212 has an extension 213 connected to the back plate 211 and a space from the extension 213 and the back plate 211.
  • a bent portion 214 extending toward the accommodating space 210 has a reflective surface 215 facing the quantum dot reinforced film 24 inside, and the reflective surface 215 is made of a light reflective material.
  • the light guide plate 23 includes a light entrance edge (not shown for viewing angle relationship) facing the light source 22, and a surrounding edge 232 connecting the light entrance edge 231 and surrounding the edge of the light guide plate 23 together with the light entrance edge.
  • the quantum dot enhancement film 24 is disposed on the first surface 233 of the light guide plate 23 and located in the accommodating space 210, and the microstructure region 243 of the quantum dot reinforced film 24 is adjacent to the surrounding edge 232 of the light guide plate 23. .
  • the plurality of first microstructures 244 have a uniform arrangement density and the same depth, height, and slope. However, it is not limited thereto, and may be as shown in FIG.
  • the arrangement density of the plurality of first microstructures 244 is closer to the surrounding edge 232; or as shown in FIG. 9, the depth or height of the plurality of first microstructures 244 is deeper toward the surrounding edge 232 or Higher; or as shown in FIG. 10, the slope of the plurality of first microstructures 244 is closer to the surrounding edge 232.
  • the light guide plate 23 when the light is conducted in the light guide plate 23, reflects the light through the arrangement of the plurality of first microstructures 244, and then passes through the quantum dot enhancement film 24 again to increase the light of the area covered by the frame 212.
  • the number of times the film is reinforced by the quantum dot to generate sufficient correcting light that is, the brightness of the region away from the light source 22 can be effectively improved, thereby providing high color saturation and solving the backlight module 2
  • a second embodiment of the backlight module 2 of the present invention is substantially the same as the first embodiment.
  • the difference is that the lead-in surface 241 of the quantum dot reinforced film 24 faces the light guide plate 23.
  • the second surface 234 of the quantum dot enhancement film 24 is located on the optical surface 242 and adjacent to the surrounding edge 232 of the light guide plate 23. Therefore, when the light is conducted in the light guide plate 23, the light can also pass through the quantum dot enhancement film 24 through the reflection of the plurality of first microstructures 244, and the light passing through the area covered by the frame 212 can also be increased.
  • the quantum dots enhance the number of times of the film 24 to generate sufficient correcting light, so that the same effects as those of the first embodiment can be achieved.
  • a third embodiment of the backlight module 2 of the present invention is substantially the same as the first embodiment, except that the microstructured region 243 of the quantum dot reinforced film 24 is simultaneously located on the lead-in surface.
  • the 241 is adjacent to the optical surface 242 and adjacent to the surrounding edge 232. Therefore, the same effect as that of the first embodiment can be achieved in the use, and the number of times that the light of the area covered by the frame 212 passes through the quantum dot enhancement film 24 can be increased in this embodiment.
  • FIG. 14 which is a fourth embodiment of the backlight module 2 (refer to FIG. 3) of the present invention
  • the embodiment is substantially the same as the first embodiment, except that the surrounding edge 246 of the quantum dot reinforced film 24 has
  • the reference side 245 corresponds to the central side 2461 and is located respectively Two side sides 2462 connected to the two ends of the central side 2461 and connected to the two ends of the reference side 245, the central side 2461 of the surrounding side 246 of the quantum dot reinforced film 24 is further disposed adjacent to the plurality of sides
  • the plurality of second microstructures 247 having a length increasing in the direction of the side 2462, such that the area away from the light source 22, the phenomenon of the corner dark band can be effectively improved.
  • the backlight module 2 As for the display device of the present invention, the backlight module 2, the plurality of optical films 3, and the liquid crystal panel 4 are included.
  • the backlight module 2 can be configured as shown in FIG. 3 , FIG. 5 , FIG. 8 , FIG. 9 , FIG. 10 , FIG. 11 or FIG. 13 , and the optical film 3 and the liquid crystal panel 4 are sequentially stacked. Placed on the first surface 233 of the light guide plate 23.
  • FIG. 1 is from the display device (display) and the light guide plate 23
  • the color difference comparison chart measured on the opposite side of the side 232, the horizontal axis in Fig. 15 is the inward distance from the edge of the display device (display), and the vertical axis is CIE1976UCS u', the existing backlight module is installed.
  • the data presented by the display is represented by a broken line A1
  • the data presented by the display device on which the backlight module 2 of the present invention is mounted is represented as a broken line B1
  • the color difference data of the broken line A1 rapidly increases as the distance increases, and within the range of 12 mm, the color difference data It gradually rises to 0.196, but rises to 0.198, which means that before the distance, near the edge area of the light guide plate 23, the bluish condition is quite obvious, and after this distance, it is getting closer to the middle of the light guide plate 23. In the region, there will be a yellower change, and there will be no obvious blueness.
  • the fold line B1 in the range of 4 to 6 mm, the color difference data has risen to 0.196, to 12 mm, the color difference data is increased to 0.198, and then stabilized at 0.198.
  • the numerical value of the diamond block is the difference in color difference data of the backlight module 2 of the present invention and the backlight module 2 to which the present invention is not mounted at the same distance.
  • FIG. 16 is a comparison diagram of color differences measured from the surrounding edge 232 of the light guide plate 23 of the display device, and the horizontal axis in FIG. 15 is inward from the edge of the display device (display).
  • the distance is vertical, and the vertical axis is CIE1976UCS v'.
  • the data presented by the display on which the existing backlight module is mounted is represented as a broken line A2
  • the data presented by the display device on which the backlight module 2 of the present invention is mounted is represented as a broken line B2
  • the broken line A2 The color difference data increases rapidly as the distance increases.
  • the color difference data of the broken line B2 gradually rises to 0.396, but rises to 0.398, which means that before the distance, near the edge area of the light guide plate 23, the bluish condition is quite obvious. In this distance After the separation, getting closer to the middle portion of the light guide plate 23, there is a yellower change, and there is no obvious chromatic aberration. In contrast to the broken line B2, in the range of 5.5 mm, the color difference data has risen to 0.410, and then remains stable at 0.410.
  • the numerical value of the diamond block in the figure is the color difference data difference in which the backlight module 2 of the present invention and the backlight module 2 of the present invention are not mounted at the same distance.
  • the microstructured region 243 is formed at the surrounding edge 232 adjacent to the light guide plate 23 by the quantum dot enhancement film 24 overlapped with the light guide plate 23, and a plurality of the first region located in the microstructure region 243
  • a microstructure 244 or a second microstructure 247 can pass the light emitted by the light source 22 and the light reflected by the reflector 25 through the quantum dot enhancement film 24 to increase the light passing through the quantum dot enhancement film 24.
  • the number of times to generate sufficient correction light not only provides high color saturation, but also solves the problem that blue light or blue color is present around the light-emitting area of the backlight module 2, so that the object of the present invention can be achieved.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种量子点增强薄膜（24）和背光模块（2）及显示设备，量子点增强薄膜（24）具有基准边（245）及与该基准边（245）相连接的环绕边（246），该量子点增强薄膜（24）的一个表面于邻近该环绕边（246）处形成有微结构区域（243）。而背光模块（2）包括外壳单元（21）、设于外壳单元（21）内的光源（22）、设于外壳单元（21）内的导光板（23）及如上述的量子点增强薄膜（24），量子点增强薄膜（24）与导光板（23）相叠接。由此能增加光线通过量子点增强薄膜（24）的次数，激发出足够的补正光，并能解决背光模块（2）发光区域周围会呈现蓝边或蓝化的问题。至于该显示设备则包括有前述的背光模块（2）、至少一个光学膜片（3）以及液晶面板（4）。

Description

量子点增强薄膜和背光模块及显示设备 技术领域
本发明涉及一种背光模块，特别是一种能改善显示边缘色差现象的量子点增强薄膜、背光模块及显示设备。
背景技术
量子点增强薄膜(Quantum Dot Enhancement Film,QDEF)是目前使用于背光模块，并用以使显示器的颜色呈现更精准的光学组件。其原理是在薄膜上设置数量相当多的两种量子点，并且以蓝光为背光光源，蓝光照射到两种量子点时会分别转换为红光及绿光，所产生的红光及绿光会与蓝光一同混色为白光，通过改变将蓝光转换为红光及绿光的比例，能使混色的效果更接近实际颜色，因而使得显示器的呈色更加精准。
参阅图1和图2，为一种现有的背光模块1，包括有背板11、连接于该背板11并与该背板11共同围绕出容置空间10的塑框12、设置于该容置空间10中的导光板13、设置于该导光板13底面且位于该容置空间10中的量子点增强薄膜14、设置于该容置空间10中的光源(图未示)、设置于该导光板13周围的反射件15、及彼此叠置于该导光板13上的多个光学膜片17。该背光模块1的光源所发出的光线会经由该导光板13传递，通过该多个光学膜片17的反射作用，使得光线自该导光板13穿透该量子点增强薄膜14时，还有机会被反射而再次穿透该量子点增强薄膜14，光线经过多次折射穿透该量子点增强薄膜14，经过混光作用产生补正光，再穿过该多个光学膜片17。另外，当光线经过该导光板13并被该反射件15反射时，会回到该导光板13内，并再次经过折射而穿透该量子点增强薄膜14产生补正光。
由于将该背光模块1的光源激发而产生补正光的过程中，该补正光的能量足够与否是取决于光线折射通过该量子点增强薄膜14的次数，若是 通过的次数越多，则会经过更多次的激发作用，使得补正光的能量较为足够，才能呈现精准的颜色。
发明内容
因此，本发明的目的在于提供一种量子点增强薄膜。
于是，本发明的量子点增强薄膜具有基准边、与该基准边相连接的环绕边、以及位于邻近该环绕边处的微结构区域。
本发明的另一目的在于提供一种可达到高色彩饱和度并能改善显示边缘色差现象的背光模块。
于是，本发明的背光模块包括具有容置空间的外壳单元、设置于该容置空间中的光源、安装于该容置空间中的导光板、以及量子点增强薄膜。该导光板具有朝向该光源的入光边、和连接该入光边而与该入光边共同围绕形成该导光板的边缘的围绕边。该量子点增强薄膜，与该导光板相叠接并位于该容置空间内，该量子点增强薄膜于邻近该围绕边处形成有微结构区域。
本发明的又一目的在于提供一种运用该背光模块以达到高色彩饱和度并能改善边缘色差现象的显示设备。
于是，本发明的显示设备包括上述的背光模块、多个光学膜片、以及液晶面板，其中，该背光模块的该导光板具有出光面，所述光学膜片与该液晶面板是依序叠置于该导光板的该出光面上。
本发明的效果在于通过该微结构区域的设置，可将光线反射，进而再次通过该量子点增强薄膜，增加光线通过该量子点增强薄膜的次数，进而使在该导光板边缘的位置也能激发足够的补正光，提供高色彩饱和度，并解决该背光模块发光区域周围会呈现蓝边或蓝化的问题。
附图说明
本发明的其他的特征及效果，将于参照附图的实施方式中清楚地呈现，其中：
图1是示意图，说明一种现有的背光模块；
图2是局部示意图，辅助说明图1；
图3是示意图，说明本发明量子点增强薄膜及背光模块的第一实施例；
图4是局部示意图，辅助说明图3；
图5是示意图，辅助说明图3，图中显示量子点增强薄膜的多个第一微结构的截面形状为R型；
图6是俯视示意图，辅助说明图3和图5，图中显示无论该多个第一微结构的截面形状为V型或R型，该多个第一微结构均呈长形延伸；
图7是俯视示意图，显示该量子点增强薄膜的俯视状态，且该多个第一微结构呈现半球形的情形；
图8是示意图，说明该多个第一微结构的排列密度是越靠近导光板的围绕边越密；
图9是示意图，说明该多个第一微结构的深度或高度是越靠近该围绕边越深或越高；
图10是示意图，说明该多个第一微结构的斜率是越靠近该围绕边越大；
图11是示意图，说明本发明量子点增强薄膜及背光模块的第二实施例；
图12是局部示意图，辅助说明图11；
图13是示意图，说明本发明量子点增强薄膜及背光模块的第三实施例；
图14是示意图，说明本发明量子点增强薄膜及背光模块的第四实施例；
图15是色差比较图，说明本发明显示设备在相反于该导光板的围绕边的一侧所测量的色差数据；以及
图16是色差比较图，说明本发明显示设备于该导光板的围绕边所测量的色差数据。
具体实施方式
在本发明被详细描述之前，应当注意在以下的说明内容中，类似的组件是以相同的编号来表示。
参阅图3、图4和图6，本发明量子点增强薄膜24及背光模块2的第一实施例，该量子点增强薄膜24具有基准边245、与该基准边245相连接的环绕边246、导入面241、与该导入面241相对的光学面242、位于该光学面242且邻近该环绕边的微结构区域243、以及位于该微结构区域243的多个第一微结构244。每一个第一微结构244的截面形状为V型，但不限于此，例如每一个第一微结构244截面形状也可以为图5所示的R型，且当该多个第一微结构244的截面形状为R型时，无论该多个第一微结构244的截面形状为V型或R型，均如图6所示呈长形延伸；另外，该多个第一微结构244亦可呈现半球形，而该微结构区域235的俯视状态如图7所示呈现圆点状。又或者该微结构区域235可为粗糙表面。
继续参阅图3、图4和图6，该背光模块2包括具有容置空间210的外壳单元21、设置于该容置空间210中的光源22、安装于该容置空间210中的导光板23、以及如上述的量子点增强薄膜24。另外，该背光模块2还包括设置于该导光板23周围的反射件25。
该外壳单元21包括背板211及围绕设置于该背板211周缘的边框212，该边框212具有与该背板211连接的延伸部213、及自该延伸部213与该背板211相间隔处朝向该容置空间210延伸的弯折部214，该弯折部214内侧具有朝向该量子点增强薄膜24的反射表面215，且该反射表面215是以光反射性材料所制成。
该导光板23包括朝向该光源22的入光边(因视图角度关系，未予显示)、连接该入光边231而与该入光边共同围绕形成该导光板23的边缘的围绕边232、第一表面233、以及与该第一表面233相对的第二表面234。前述该量子点增强薄膜24是叠置于该导光板23的第一表面233并位于该容置空间210内，且该量子点增强薄膜24的微结构区域243邻近该导光板23的围绕边232。
继续如图4所示，在本实施例中，该多个第一微结构244的排列密度均匀，且深度、高度及斜率相同。但不限于此，也可以是如图8所示，该 多个第一微结构244的排列密度是越靠近该围绕边232越密；或是如图9所示，该多个第一微结构244的深度或高度是越靠近该围绕边232越深或越高；也可以是如图10所示，该多个第一微结构244的斜率是越靠近该围绕边232越大。
再参阅图3、图4和图6，在使用上，当该光源22所发出的光线经由该导光板23传递至该反射件25时，由该反射件25所反射的光线，会再次进入该导光板23，当光线于该导光板23中传导时，通过该多个第一微结构244的设置可将光线反射，进而再次通过该量子点增强薄膜24，增加该边框212所遮蔽区域的光线通过该量子点增强薄膜24的次数，以产生足够的补正光，亦即使得这处远离光源22的区域的辉度可以有效提高，从而不但能提供高色彩饱和度，并能解决该背光模块2发光区域周围会呈现蓝边或蓝化的问题。
参阅图11和图12，为本发明背光模块2的第二实施例，本实施例与第一实施例大致相同，不同的地方是在于该量子点增强薄膜24的导入面241朝向该导光板23的第二表面234，该量子点增强薄膜24的该微结构区域243是位于该光学面242且邻近该导光板23的围绕边232。由此当光线于该导光板23的中传导时，亦能经由该多个第一微结构244的反射，而再次通过该量子点增强薄膜24，同样可增加该边框212所遮蔽区域的光线通过该量子点增强薄膜24的次数，以产生足够的补正光，从而也能达成与第一实施例相同的效果。
参阅图13，为本发明背光模块2的第三实施例，本实施例与第一实施例大致相同，不同的地方是在于该量子点增强薄膜24的该微结构区域243是同时位于该导入面241与该光学面242且邻近该围绕边232。由此在使用上不但能达成与第一实施例相同的效果，且本实施例相较于上述二实施例更可增加该边框212所遮蔽区域的光线通过该量子点增强薄膜24的次数。
参阅图14，为本发明背光模块2(回顾参阅图3)的第四实施例，本实施例与第一实施例大致相同，不同的地方是在于该量子点增强薄膜24的环绕边246具有与该基准边245相对应的中央侧2461、以及分别位于该 中央侧2461二端且与该基准边245二端相连接的两个旁侧2462，该量子点增强薄膜24的环绕边246的中央侧2461邻近位置处还设置有相平行且往该多个旁侧2462方向的长度渐增的多个第二微结构247，使得远离光源22的区域，其角落暗带的现象可以有效改善。
至于本发明的显示设备则是包括背光模块2、多个光学膜片3以及液晶面板4。其中，该背光模块2可为如图3、图5、图8、图9、图10、图11或图13所示的构造设计，所述光学膜片3与该液晶面板4是依序叠置于该导光板23的该第一表面233上。
进一步比较安装现有的背光模块的显示器与本发明背光模块2的显示设备在色差上的差异：参阅图1、图3及图15，图15是自该显示设备(显示器)与该导光板23的围绕边232相反的一侧所测量的色差比较图，图15中的横轴为自显示设备(显示器)边缘向内的距离，而纵轴则为CIE1976UCS u′，安装现有的背光模块的显示器所呈现的数据表示为折线A1，安装本发明的背光模块2的显示设备所呈现的数据表示为折线B1，折线A1的色差数据随着距离增加而快速增加，在12mm的范围内，色差数据是逐步上升到0.196，然而才上升到0.198，代表在此距离之前，靠近该导光板23的边缘区域，偏蓝的情况相当明显，而在此距离之后，越来越靠近该导光板23的中间区域，才有较黄的变化，不会有明显的偏蓝。反观折线B1，在4至6mm的范围内，色差数据已上升到0.196，到了12mm，色差数据就提高到0.198，之后就在0.198维持稳定。在图15中，菱形块的数值，就是在同一距离下，安装有本发明的背光模块2及没有安装本发明的背光模块2的色差数据差值。
参阅图1、图3及图16，图16是自该显示设备的该导光板23的围绕边232所测量的色差比较图，图15中的横轴为自显示设备(显示器)边缘向内的距离，而纵轴则为CIE1976UCS v′，安装现有的背光模块的显示器所呈现的数据表示为折线A2，安装本发明的背光模块2的显示设备所呈现的数据表示为折线B2，折线A2的色差数据随着距离增加而快速增加，折线B2的色差数据是逐步上升到0.396，然而才上升到0.398，代表在此距离之前，靠近该导光板23的边缘区域，偏蓝的情况相当明显，而在此距 离之后，越来越靠近该导光板23的中间区域，才有较黄的变化，不会有明显的色差。反观折线B2，在5.5mm的范围内，色差数据已上升到0.410，之后就在0.410维持稳定。图中菱形块的数值，就是在同一距离下，安装有本发明的背光模块2及没有安装本发明的背光模块2的色差数据差值。
综上所述，通过在与该导光板23相叠接的量子点增强薄膜24于邻近该导光板23的围绕边232处形成有微结构区域243、以及位于该微结构区域243的多个第一微结构244或第二微结构247，可使由光源22所发出的光线及经由该反射件25所反射的光线，再次通过该量子点增强薄膜24，增加光线通过该量子点增强薄膜24的次数，以产生足够的补正光，不但能提供高色彩饱和度，并能解决该背光模块2发光区域周围会呈现蓝边或蓝化的问题，故确实能达成本发明的目的。
惟以上所述者，仅为本发明的较佳实施例而已，当不能以此限定本发明实施的范围，即大凡依本发明申请专利范围及专利说明书内容所作的简单的等效变化与修饰，皆仍属本发明专利涵盖的范围内。

Claims (16)

  1. 一种量子点增强薄膜，包括：
    基准边；
    与所述基准边相连接的环绕边；和
    微结构区域，位于邻近所述环绕边处。
  2. 根据权利要求1所述的量子点增强薄膜，其中，所述量子点增强薄膜的所述微结构区域是于邻近所述环绕边处往所述量子点增强薄膜中心方向延伸。
  3. 根据权利要求1所述的量子点增强薄膜，其中，所述量子点增强薄膜还具有位于所述微结构区域的多个第一微结构，所述多个第一微结构的排列密度是越靠近所述环绕边越密。
  4. 根据权利要求3所述的量子点增强薄膜，其中，所述多个第一微结构的深度或高度是越靠近所述环绕边越深或越高。
  5. 根据权利要求3所述的量子点增强薄膜，其中，所述多个第一微结构的斜率是越靠近所述环绕边越大。
  6. 根据权利要求1所述的量子点增强薄膜，其中，所述量子点增强薄膜的所述环绕边具有与所述基准边相对应的中央侧、以及分别位于所述中央侧二端且与所述基准边二端相连接的两个旁侧，所述量子点增强薄膜的所述环绕边的所述中央侧邻近位置处还设置有相平行且往所述多个旁侧方向的长度渐增的多个第二微结构。
  7. 一种背光模块，包括：
    外壳单元，具有容置空间；
    光源，设置于所述容置空间中；
    导光板，安装于所述容置空间中，所述导光板具有朝向所述光源的入光边、和连接所述入光边而与所述入光边共同围绕形成所述导光板的边缘的围绕边；和
    量子点增强薄膜，与所述导光板相叠接并位于所述容置空间内，所述量子点增强薄膜于邻近所述围绕边处形成有微结构区域。
  8. 根据权利要求7所述的背光模块，其中，所述量子点增强薄膜的所述微结构区域是于邻近所述围绕边处往所述量子点增强薄膜中心方向延伸。
  9. 根据权利要求7所述的背光模块，其中，所述量子点增强薄膜具有朝向所述导光板的导入面、以及与所述导入面相对且朝向所述外壳单元的光学面，所述微结构区域是位于所述导入面和/或所述光学面。
  10. 根据权利要求7所述的背光模块，其中，所述量子点增强薄膜具有位于所述微结构区域的多个第一微结构，且所述多个第一微结构的排列密度是越靠近所述围绕边越密。
  11. 根据权利要求10所述的背光模块，其中，所述多个第一微结构的深度或高度是越靠近所述围绕边越深或越高。
  12. 根据权利要求10所述的背光模块，其中，所述多个第一微结构的斜率是越靠近所述围绕边越大。
  13. 根据权利要求7所述的背光模块，其中，所述量子点增强薄膜的所述环绕边具有与所述基准边相对应的中央侧、以及分别位于所述中央侧二端且与所述基准边二端相连接的两个旁侧，所述量子点增强薄膜的所述环绕边的所述中央侧邻近位置处还设置有相平行且往所述多个旁侧方向的长度渐增的多个第二微结构。
  14. 根据权利要求7所述的背光模块，其中，所述外壳单元包括背板和围绕设置于所述背板周缘的边框，所述边框具有与所述背板连接的延伸部、和自所述延伸部与所述背板相间隔处朝向所述容置空间延伸的弯折部，所述弯折部内侧具有至少一个反射表面。
  15. 根据权利要求7所述的背光模块，其中，所述外壳单元是以光反射性材料所制成，以形成所述反射表面。
  16. 一种显示设备，包括根据权利要求7至15中任一项所述的背光模块、多个光学膜片以及液晶面板，其中，所述背光模块的导光板具有第一表面以及与所述第一表面相对的第二表面，所述光学膜片与所述液晶面板是依序迭置于所述导光板的所述第一表面上。
PCT/CN2015/099784 2015-06-09 2015-12-30 量子点增强薄膜和背光模块及显示设备 WO2016197586A1 (zh)

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