WO2016183896A1 - 显示装置及其反射片 - Google Patents

显示装置及其反射片 Download PDF

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Publication number
WO2016183896A1
WO2016183896A1 PCT/CN2015/081851 CN2015081851W WO2016183896A1 WO 2016183896 A1 WO2016183896 A1 WO 2016183896A1 CN 2015081851 W CN2015081851 W CN 2015081851W WO 2016183896 A1 WO2016183896 A1 WO 2016183896A1
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Prior art keywords
layer
fluorescent particles
reflective
quantum fluorescent
light
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PCT/CN2015/081851
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English (en)
French (fr)
Inventor
曾杰
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武汉华星光电技术有限公司
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Priority to US14/778,216 priority Critical patent/US20170102124A1/en
Publication of WO2016183896A1 publication Critical patent/WO2016183896A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/0808—Mirrors having a single reflecting layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
    • 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
    • G02F1/133553—Reflecting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
    • G02B2207/113—Fluorescence
    • 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
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/02—Function characteristic reflective

Definitions

  • the present invention relates to the field of display technology, and in particular to a reflective sheet.
  • the invention also relates to a display device comprising such a reflective sheet.
  • a reflective sheet is an optical member used to change the optical path and is commonly used in display devices to change the optical path of a backlight in a display device.
  • the reflective sheet in the prior art generally only specularly reflects the light emitted by the backlight, which makes the light that passes out of the reflective sheet uneven, which may cause the display device using the reflective sheet to be in the display area thereof.
  • a uniform light source is obtained, which in turn causes the display device to display an uneven brightness of the image and severely distort the color of the image.
  • the present invention proposes a reflection sheet which has a high uniformity of light emission.
  • the present invention also proposes a display device including such a reflection sheet.
  • a reflective sheet comprising a base layer, a reflective layer laid over the base layer, and a scattering layer laid on a side of the reflective layer facing away from the base layer.
  • the scattering layer comprises quantum fluorescent particles disposed on a side of the reflective layer that faces away from the base layer.
  • the quantum fluorescent particles can be excited to emit light, and the excited light emits light in all directions, so that the light passing through the scattering layer faces in all directions, and the light uniformity of the reflective sheet is improved.
  • the quantum fluorescent particles are excited to emit light energy to illuminate the surrounding quantum fluorescent particles, and the surrounding quantum fluorescent particles are thereby excited to emit light in all directions. This structure allows light to be more uniformly diffused in the scattering layer, thereby ensuring uniformity of light emitted outside the reflection sheet.
  • the scattering layer includes a dielectric body laid on one side of the reflective layer facing away from the base layer, and a plurality of quantum fluorescent particles dispersed within the dielectric body.
  • the quantum fluorescent particles can be illuminated by light irradiation, thereby ensuring the uniformity of light emitted outside the reflective sheet.
  • the dielectric body can make the quantum fluorescent particles dispersed inside thereof more uniform.
  • the quantum fluorescent particles can be conveniently covered on the reflective layer by the dielectric body, thereby reducing the manufacturing process difficulty.
  • the plurality of quantum fluorescent particles have different particle sizes. After the quantum fluorescent particles of different particle sizes are illuminated by the backlight, different colors of light can be emitted depending on the particle size. By appropriately selecting the appropriate proportion of the quantum fluorescent particles of the respective particle diameters, the light passing through the reflecting sheet can be mixed into high-quality white light.
  • an isolation layer is also disposed between the reflective layer and the scattering layer.
  • the isolation layer isolates the reflective layer from the scattering layer. Therefore, when the scattering layer is provided, the scattering layer does not scratch the reflective layer, thereby ensuring the reflection effect of the reflective layer.
  • the roughness of the surface of the isolation layer that is in contact with the scattering layer is greater than the roughness of the surface of the reflective layer that is in contact with the isolation layer.
  • the reflective sheet further includes a protective layer overlying the surface of the scattering layer that faces away from the reflective layer.
  • the protective layer prevents the scattering layer from being directly exposed to the outside, and thereby prevents the structure of the scattering layer from being damaged.
  • the protective layer covering the scattering layer can also prevent oxidation of the protective layer, thereby ensuring the effectiveness of the scattering layer. Sex, which in turn ensures the uniformity of the light output of the entire reflective sheet.
  • the reflective sheet is a flat reflective sheet.
  • the processing method of the flat reflective sheet is simple, and thus the processing cost of the reflective sheet is reduced.
  • a display device comprising the above-mentioned reflection sheet.
  • the display device using the reflection sheet has a clearer image, uniform light, and bright colors, which can satisfy the user's demand for images.
  • An advantage of the present invention over the prior art is that: (1) light passes through the scattering layer and is reflected at the reflective layer and, after reflection, passes through the scattering layer and exits out of the reflective sheet. (2) Light scatters as it passes through the scattering layer, so that the direction of the light can be changed so that the light can be spread in a plurality of directions. (3) After the light is emitted from the reflection sheet, the range covered by the light is increased, thereby effectively improving the uniformity of light emission of the reflection sheet.
  • Figure 1 is a schematic view showing an embodiment of a reflection sheet of the present invention
  • FIG. 1 and 2 schematically show the general structure of a reflection sheet 100 of the present invention.
  • the reflective sheet 100 includes a base layer 10 and a reflective layer 30 laid on the base layer 10, and the reflective layer 30 can reflect light.
  • an adhesive layer 20 is disposed between the reflective layer 30 and the base layer 10 to bond the reflective layer 30 to the base layer 10 so that the reflective layer 30 can be more stably fixed to the base layer 10.
  • the reflective sheet 100 can be used in a display device to reflect light emitted by a backlight within the display device in a desired direction.
  • the base layer 10 is a structure having a certain supporting ability, which can be made of polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • a corresponding scattering layer 50 may be disposed on the reflection layer 30.
  • the scattering layer 50 can change the optical path so that the light can be emitted in more directions, so that the light emitted out of the reflective sheet 100 can be directed in various directions, effectively improving the reflection sheet 100. Light uniformity.
  • the scattering layer 50 is disposed directly on the reflective layer 30. This structure is simple and low in cost.
  • the upper surface of the isolation layer 40 i.e., the surface of the isolation layer 40 that is in contact with the scattering layer 50
  • the upper surface of the reflective layer 30 i.e., the reflective layer 30 is opposite to the isolation layer 40.
  • the roughness of the contact surface The scattering layer 50 is laid on the surface of the rougher isolation layer 40 than the scattering layer 50 is directly laid on the reflective layer 30, so that the scattering layer 50 is not easily peeled off, thereby ensuring the structural stability of the entire reflective sheet 100.
  • a protective layer 60 may also be laid over the scattering layer 50, i.e., on the side of the scattering layer 50 that faces away from the reflective layer 30.
  • a protective layer 60 is attached to the surface of the scattering layer 50 to prevent damage to the structure of the scattering layer 50.
  • the protective layer 60 and the isolation layer 40 sealingly sandwich the scattering layer 50 between the protective layer 60 and the isolation layer 40, which also prevents the scattering layer 50, particularly the scattering layer 50 having the quantum fluorescent particles 52, from being oxidized.
  • the protective layer 60 may be made of zinc sulfide (ZnS). It should be understood that in the embodiment shown in FIG. 1, the protective layer 60 may also be provided accordingly.
  • the structure of the scattering layer 50 will be described in detail below with reference to FIGS. 1 to 3.
  • the scattering layer 50 includes a dielectric body 51, and quantum fluorescent particles 52 dispersed in the dielectric body 51, as shown in FIG.
  • the dielectric body 51 is laid directly on the reflective layer 30.
  • the dielectric body 51 is laid directly on the isolation layer 40.
  • This scattering layer 50 is formed by mixing the quantum fluorescent particles 52 with a medium fluid and coating the mixture on the reflective layer 30.
  • the medium fluid may be water, an alcohol such as methanol or ethanol, an ester such as ethyl acetate, or an organic solvent such as a halogenated hydrocarbon or toluene.
  • the scattering layer 50 can homogenize the light passing through the reflection sheet 100 by the quantum fluorescent particles 52 dispersed throughout the dielectric body 51.
  • the manufacturing process of the scattering layer 50 is simpler and can be conveniently applied to the manufacturing process.
  • such a scattering layer 50 enables the quantum fluorescent particles 52 to be more uniformly dispersed throughout the dielectric body 51, which is advantageous in making the light emitted from the reflective sheet 100 more uniform.
  • the reflective sheet 100 During operation of the reflective sheet 100, light enters the scattering layer 50 and illuminates the quantum fluorescent particles 52, which are excited to emit light accordingly.
  • the light emitted by the quantum fluorescent particles 52 is directed in all directions, thereby changing the path of the light such that the light passing through the reflective sheet 100 is more uniform.
  • the light emitted by the quantum fluorescent particles 52 can also excite the quantum fluorescent particles 52 around them to cause them to emit light together, thereby further improving the uniformity of light passing through the reflective sheet 100.
  • the quantum fluorescent particles 52 are quantum dots and are semiconductor nanocrystals.
  • the plurality of quantum fluorescent particles 52 are plural, and the plurality of quantum fluorescent particles 52 may be composed of quantum fluorescent particles of the same material, or may be composed of quantum fluorescent particles of different materials. .
  • the quantum fluorescent particles 52 mixed with such a material are more convenient to use, so that the manufacturing process difficulty and the manufacturing cost of the reflective sheet 100 can be effectively reduced.
  • the material of the quantum fluorescent particles 52 may be CdS, CdSe, CdTe, ZnSe, InP or InAs or the like.
  • the backlight can be made blue, and the quantum fluorescent particles excited to emit red light and the quantum fluorescent particles excited to emit green light can be selected, and the two kinds of quantum fluorescent particles are uniformly mixed and uniformly dispersed to Above the reflective layer 30.
  • the red and green light generated by the excitation and the blue light of the backlight itself can form relatively pure white light, and the pure white light can be applied to the display device to improve the display effect of the display device.
  • the fluorescent particles emitting blue light may be further incorporated into the fluorescent particles emitting red light and green light as needed to ensure that the light which is emitted outside the reflection sheet 100 can be better mixed into white light.
  • the reflection sheet 100 Since the light passing through the reflection sheet 100 can be made sufficiently uniform by the above-described scattering layer 50, the reflection sheet 100 can be formed into a flat shape to make the structure of the reflection sheet 100 simpler, and thereby the reflection sheet 100 is lowered. Processing difficulty and processing cost.

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

Abstract

一种反射片（100）包括基层（10），铺设于基层（10）之上的反射层（30），以及铺设在反射层（30）的背向基层（10）的一侧的散射层（50）。经这种反射片（100）穿出的光线更加均匀，从而可提高使用这种反射片（100）的显示装置所显示出的图像的品质。

Description

显示装置及其反射片
相关申请的交叉引用
本申请要求享有于2015年5月19日提交的名称为“显示装置及其反射片”的中国专利申请CN201510257803.X的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本发明涉及显示技术领域，特别是涉及一种反射片。本发明还涉及包括这种反射片的显示装置。
背景技术
反射片是用于改变光路的一种光学构件，常用于显示装置内，以改变显示装置中的背光源的光路。
现有技术中的反射片通常只对背光源发出的光进行镜面反射，这使得穿出到反射片之外的光不均匀，从而会导致使用这种反射片的显示装置无法在其显示区域内获得均匀的光源，进而使得显示装置显示出的图像亮度不均匀，并且使图像颜色会严重失真。
因此，需要一种出光均匀度较高的反射片。
发明内容
针对上述问题，本发明提出了一种反射片，这种反射片的出光均匀度较高。本发明还提出了一种包括这种反射片的显示装置。
根据本发明的第一方面，提出了一种反射片，包括基层，铺设于基层之上的反射层，以及铺设在反射层的背向基层的一侧的散射层。
通过使用本发明的反射片，光穿过散射层，然后在反射层处反射，并在反射后穿过散射层而射出到反射片之外。光在穿过散射层时会发生散射，由此改变了光线的方向，使得光可以朝向多个方向扩散开。因此，上述结构使得在光射出反射片之后，光所覆盖的范围增大了，从而提高了反射片的出光均匀度。
在一个实施例中，散射层包括铺设在反射层的背向基层的一侧的量子荧光颗粒。在光照射到量子荧光颗粒后，量子荧光颗粒能受激发而发光，这种受激发而发出的光朝向四面八方，从而使得穿过散射层的光朝向四面八方，提高了反射片的出光均匀度。另外，量子荧光颗粒受激发而发出的光能照射到其周围的量子荧光颗粒，周围的这些量子荧光颗粒由此而受到激发，朝向四面八方发射光线。这种结构使得光线能在散射层中更加均匀地扩散，从而能保证射出到反射片之外的光的均匀度。
在一个实施例中，散射层包括铺设在反射层的背向基层的一侧的介质体，以及分散在介质体内的多个量子荧光颗粒。量子荧光颗粒能受光照射而发光，由此保证了射出到反射片之外的光的均匀度。另外，介质体能够使分散在其内部的量子荧光颗粒更加均匀。此外，能通过介质体而方便地将量子荧光颗粒覆盖在反射层之上，由此降低了制造工艺难度。
在一个实施例中，多个量子荧光颗粒包括硒化镉量子荧光颗粒。硒化镉量子荧光颗粒的荧光效果较好，能均匀地发出亮度较高的光线，从而能有效提高射出到反射片之外的光的均匀度。另外，硒化镉量子荧光颗粒能发出较为纯正的高品质单色光，由此提高了反射片出射光的品质，从而能有效保证使用这种反射片的显示装置的图像品质。
在一个实施例中，多个量子荧光颗粒具有不同的粒径。不同粒径的量子荧光颗粒受背光照射后，能根据粒径大小的不同而发射出不同颜色的光。通过合理选择相应粒径的量子荧光颗粒进行比例适当的混合，能够使穿过反射片的光混合为优质的白光。
在一个实施例中，在反射层与散射层之间还设置有隔离层。隔离层能将反射层与散射层隔离开。由此在设置散射层时，散射层不会将反射层划伤，从而保证了反射层的反射效果。
在一个实施例中，隔离层的与散射层接触的表面的粗糙度大于反射层的与隔离层接触的表面的粗糙度。以这种隔离层为基底而铺设散射层，能使得散射层更稳定地固定在隔离层上。
在一个实施例中，反射片还包括覆盖在散射层的背向反射层的表面上的保护层。保护层能防止散射层直接暴露在外界，并由此防止了散射层的结构受到破坏。另外，覆盖在散射层上的保护层还能防止保护层氧化，由此保证了散射层的有效 性，进而保证了整个反射片的出光均匀度。
在一个实施例中，反射片为平板状反射片。平板状的反射片的加工工艺简单，并由此降低了反射片的加工成本。
根据本发明的第二方面，提出了一种显示装置，其包括上述反射片。使用这种反射片的显示装置所显示出的图像更加清晰，光线均匀，色彩鲜艳，能够满足使用者对图像的需求。
与现有技术相比，本发明的优点在于：(1)光穿过散射层而在反射层处反射，并在反射后穿过散射层而射出到反射片之外。(2)光在穿过散射层时会发生散射，从而能够改变光的方向，使得光可以朝向多个方向扩散开。(3)在光射出反射片之后，光所覆盖的范围增大了，从而有效提高了反射片的出光均匀度。
附图说明
在下文中将基于实施例并参考附图来对本发明进行更详细的描述。其中显示了：
图1为显示了本发明的反射片的一个实施例的示意图；
图2为显示了本发明的反射片的另一个实施例的示意图；以及
图3为显示了根据图1或图2中的散射层的一个实施例的示意图。
在附图中，相同的部件使用相同的附图标记。附图并未按照实际的比例绘制。
具体实施方式
下面将结合附图对本发明作进一步说明。
图1和图2示意性地显示了本发明的反射片100的大体结构。
反射片100包括基层10以及铺设于基层10之上的反射层30，反射层30能对光线进行反射。优选地在反射层30与基层10之间设置有粘结层20，以将反射层30与基层10粘结在一起，使反射层30能更加稳定地固定在基层10上。反射片100可用于显示装置内，以对显示装置内的背光源所发出的光进行反射，使其朝向所需的方向。
基层10为具有一定支撑能力的结构，其可由聚对苯二甲酸乙二醇酯(PET)制成。
为了保证由反射片100射出的光更加均匀而不局限在特定的方向和位置上，可在反射层30之上再设置相应的散射层50。在光穿过散射层50时，散射层50能改变光路，以使得光能朝向更多的方向发射，进而使得射出到反射片100之外的光能朝向各个方向，有效提高了反射片100的出光均匀度。
在如图1所示的实施例中，散射层50直接设置在反射层30上。这种结构简单并且成本较低。
在如图2所示的实施例中，在散射层50与反射层30之间还设置有隔离层40。在这种结构中，散射层50铺设在隔离层40上而与反射层30相间隔，从而使得散射层50不会划伤反射层30的表面，由此保证了整个反射片100的反射效果。隔离层40可由聚对苯二甲酸乙二醇酯(PET)制成。
另外，还优选地令隔离层40的上表面(即，隔离层40的与散射层50相接触的表面)的粗糙度大于反射层30的上表面(即，反射层30的与隔离层40相接触的表面)的粗糙度。与将散射层50直接铺设在反射层30上相比，将散射层50铺设在表面更加粗糙的隔离层40上，使得散射层50不易脱落，从而保证了整个反射片100的结构稳定性。
还可在散射层50之上，即在散射层50背向反射层30的一侧上，铺设保护层60。保护层60附在散射层50的表面上，以防止散射层50的结构受到损坏。优选地，保护层60与隔离层40将散射层50密封式夹在保护层60与隔离层40之间，这还能防止散射层50，尤其是具有量子荧光颗粒52的散射层50，发生氧化。保护层60可由硫化锌(ZnS)制成。应理解地是，在图1所示的实施例中，也可相应地设置保护层60。
下面将结合图1到图3对散射层50的结构进行详细描述。
在图1和图2所示的实施例中，散射层50可由量子荧光颗粒组成。在图1所示的实施例中，直接将量子荧光颗粒铺设在反射层30上。在图2所示的实施例中，直接将量子荧光颗粒铺设在隔离层40上。
优选地，在图1和图2所示的实施例中，散射层50包括介质体51，以及分散在介质体51内的量子荧光颗粒52，如图3所示的那样。在图1所示的实施例中，介质体51直接铺设在反射层30上。在图2所示的实施例中，介质体51直接铺设在隔离层40上。
这种散射层50是将量子荧光颗粒52与介质流体混合，并将混合物涂布在反射层30上而形成的。介质流体可以为水，也可以为甲醇、乙醇等醇类，乙酸乙酯等酯类，卤代烃或甲苯等有机溶剂。
如图3所示，散射层50能通过分散在整个介质体51内的量子荧光颗粒52而将穿过反射片100的光均匀化。另外，这种散射层50的制造工艺更为简单，能够方便地运用到生产制造过程中。另外，这种散射层50使得量子荧光颗粒52能够更加均匀地分散在整个介质体51内，有利于使由反射片100射出的光更加均匀。
在反射片100的工作过程中，光进入到散射层50内并照射到量子荧光颗粒52，量子荧光颗粒52受激发而相应地发光。量子荧光颗粒52发出的光是朝向四面八方的，由此改变了光的路径，使得穿过反射片100的光更加均匀。另外，量子荧光颗粒52受激发而发出的光还可以激发在其周围的量子荧光颗粒52，使其一同发光，由此更是提高了穿过反射片100的光的均匀度。这里应理解地是，量子荧光颗粒52即为量子点，是半导体纳米晶体。
在图1和图2所示的实施例中，量子荧光颗粒52均为多个，并且多个量子荧光颗粒52可以由同一种材质的量子荧光颗粒组成，也能由不同材质的量子荧光颗粒组成。这种材质混合的量子荧光颗粒52使用更加方便，从而能有效降低反射片100的制造工艺难度以及制造成本。量子荧光颗粒52的材料可为CdS、CdSe、CdTe、ZnSe、InP或InAs等。
另外，可根据背光源的颜色而选择不同的量子荧光颗粒52。量子荧光颗粒52受激发能发出颜色较为纯正的光，因此通过设置与背光源的颜色相匹配的量子荧光颗粒52能够混合出白光，并由此能扩大使用这种反射片100的显示装置的色域，从而能提高显示装置的显示品质。
可选用硒化镉量子荧光颗粒，以发出颜色纯正的高质量单色光。另外，硒化镉量子荧光颗粒具有较好的荧光效果，能发出均匀并亮度较高的光。此外，通过选择不同粒径的量子荧光颗粒52，可以对发出的光的颜色进行相应的选择。例如，可选择尺寸为10nm的硒化镉量子荧光颗粒，其受激发可以发射较为纯正的高质量红光，选择尺寸为2.5nm的硒化镉量子荧光颗粒，其受激发可以发射较为纯正的高质量绿光，或者选择尺寸为2nm的硒化镉量子荧光颗粒，其受激发可以发射较为纯正的高质量蓝光。
在一个实施例中，可令背光源为蓝色，则可选择受激发发出红光的量子荧光颗粒和受激发发出绿光的量子荧光颗粒，将这两种量子荧光颗粒均匀混合并均匀分散到反射层30之上。受激发产生的红光和绿光与背光源本身的蓝光相混合能形成较为纯正的白光，这种纯正的白光能应用到显示装置中，提高显示装置的显示效果。
根据需要也可在发出红光和绿光的量子荧光颗粒之中再掺入发出蓝光的量子荧光颗粒，以保证穿出到反射片100之外的光能更好地混合为白光。
由于通过上述散射层50，已经能使得穿过反射片100的光足够均匀了，因此可将反射片100制成平板状，以使反射片100的结构更加简单，并由此降低了反射片100的加工工艺难度和加工成本。
上述反射片100均具有较高的出光均匀度，由此使得使用上述反射片100的显示装置能具有较好的显示品质，所显示的图像亮度均匀，颜色更加真实和鲜艳，极大地满足了使用者对图像的需求。
虽然已经参考优选实施例对本发明进行了描述，但在不脱离本发明的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本发明并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (20)

  1. 一种反射片，其包括基层，铺设于所述基层之上的反射层，以及铺设在所述反射层的背向所述基层的一侧的散射层。
  2. 根据权利要求1所述的反射片，其中，在所述反射层与散射层之间还设置有隔离层。
  3. 根据权利要求2所述的反射片，其中，所述隔离层的与散射层接触的表面的粗糙度大于所述反射层的与隔离层接触的表面的粗糙度。
  4. 根据权利要求1所述的反射片，其中，所述散射层包括铺设在所述反射层的背向所述基层的一侧的多个量子荧光颗粒。
  5. 根据权利要求4所述的反射片，其中，多个所述量子荧光颗粒包括硒化镉量子荧光颗粒。
  6. 根据权利要求4所述的反射片，其中，多个所述量子荧光颗粒具有不同的粒径。
  7. 根据权利要求1所述的反射片，其中，所述散射层包括铺设在所述反射层的背向所述基层的一侧的介质体，以及分散在所述介质体内的多个量子荧光颗粒。
  8. 根据权利要求7所述的反射片，其中，多个所述量子荧光颗粒包括硒化镉量子荧光颗粒。
  9. 根据权利要求7所述的反射片，其中，多个所述量子荧光颗粒具有不同的粒径。
  10. 根据权利要求7所述的反射片，其中，在所述反射层与散射层之间还设置有隔离层。
  11. 根据权利要求10所述的反射片，其中，所述隔离层的与散射层接触的表面的粗糙度大于所述反射层的与隔离层接触的表面的粗糙度。
  12. 根据权利要求1所述的反射片，其中，还包括覆盖在所述散射层背向反射层的表面上的保护层。
  13. 根据权利要求1所述的反射片，其中，所述反射片为平板状反射片。
  14. 一种显示装置，其包括反射片，所述反射片包括基层，铺设于所述基层之上的反射层，以及铺设在所述反射层的背向所述基层的一侧的散射层。
  15. 根据权利要求14所述的显示装置，其中，所述散射层包括铺设在所述反射层的背向所述基层的一侧的多个量子荧光颗粒。
  16. 根据权利要求14所述的显示装置，其中，所述散射层包括铺设在所述反射层的背向所述基层的一侧的介质体，以及分散在所述介质体内的多个量子荧光颗粒。
  17. 根据权利要求16所述的显示装置，其中，多个所述量子荧光颗粒包括硒化镉量子荧光颗粒。
  18. 根据权利要求16所述的显示装置，其中，多个所述量子荧光颗粒具有不同的粒径。
  19. 根据权利要求14所述的显示装置，其中，在所述反射层与散射层之间还设置有隔离层。
  20. 根据权利要求14所述的显示装置，其中，还包括覆盖在所述散射层背向反射层的表面上的保护层。
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