WO2018126705A1 - 导光板、背光模组及显示装置 - Google Patents

导光板、背光模组及显示装置 Download PDF

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Publication number
WO2018126705A1
WO2018126705A1 PCT/CN2017/098758 CN2017098758W WO2018126705A1 WO 2018126705 A1 WO2018126705 A1 WO 2018126705A1 CN 2017098758 W CN2017098758 W CN 2017098758W WO 2018126705 A1 WO2018126705 A1 WO 2018126705A1
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WO
WIPO (PCT)
Prior art keywords
light
light guide
guide plate
reflective surface
reflective
Prior art date
Application number
PCT/CN2017/098758
Other languages
English (en)
French (fr)
Inventor
李海龙
王宁
程晓亮
张晓哲
刘玉东
Original Assignee
京东方科技集团股份有限公司
合肥鑫晟光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 合肥鑫晟光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/755,809 priority Critical patent/US11262493B2/en
Publication of WO2018126705A1 publication Critical patent/WO2018126705A1/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
    • G02B6/0013—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
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • 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

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a light guide plate, a backlight module, and a display device.
  • the Back Light Module is a light source that is fixed behind a liquid crystal display (LCD).
  • a light bar that is, a light-emitting diode (LED)
  • the backlight module includes a light guide plate. The light emitted by the light bar is transmitted through the light guide plate. Therefore, the light transmission effect of the light guide plate directly affects the optical quality of the backlight module.
  • Embodiments of the present disclosure provide a light guide plate, a backlight module, and a display device, which can improve the Hot Spot phenomenon appearing in the backlight module, improve the uniformity of the light output of the light guide plate, and thereby improve the optical quality of the backlight module.
  • a light guide plate in a first aspect of the present disclosure, includes: a light guide plate body and a prism structure at at least one end of the light guide plate body, wherein the prism structure includes a light incident surface and at least one reflective surface, and light incident from the light incident surface can be The at least one reflective surface is reflected into the body of the light guide plate.
  • the light guide plate body includes a first face and a second face opposite the first face, wherein the first face is a light exit face.
  • the at least one reflective surface includes a first reflective surface and a second reflective surface, the first reflective surface is coupled to the first surface, and the second reflective surface Connected to the second side.
  • the light incident surface is not parallel to the second surface, the first reflective surface is not parallel to the light incident surface, and light incident by the light incident surface is reflected by the first reflective surface to the first
  • the second reflecting surface is reflected by the second reflecting surface into the light guide body.
  • the at least one reflective surface further includes a third reflective surface that is coupled to the light incident surface and the first reflective surface, respectively.
  • the at least one reflective surface includes a fourth reflective surface, the light incident surface is connected to the first surface and is not parallel, and the fourth reflective surface is coplanar with the second surface, The light incident on the light incident surface is reflected by the fourth reflective surface into the light guide body.
  • a light diffusing structure is disposed within the prism structure.
  • the light diffusing structure comprises diffusing particles or bubbles.
  • the light guide body and the prism structure are formed as a unitary structure.
  • the at least one reflective surface is formed by a reflective layer disposed on an outer surface of the prismatic structure.
  • diffusing particles are disposed between the reflective layer and the outer surface of the prism structure.
  • the material of the diffusion particles comprises polyethylene terephthalate.
  • the diffusing particles have a diameter ranging from about 10 microns to about 30 microns.
  • a backlight module in a second aspect of the present disclosure, includes: a light bar and a light guide plate described in any one of the embodiments herein, wherein a light exit surface of the light bar is opposite to the light incident surface.
  • a display device comprising: the backlight module described in any one of the embodiments herein.
  • FIG. 1 is a schematic structural view of a backlight module
  • 2-1 is a schematic structural diagram of a light guide plate according to an embodiment of the present disclosure
  • FIG. 2-2 is a schematic structural diagram of another light guide plate according to an embodiment of the present disclosure.
  • 2-3 is a schematic structural diagram of still another light guide plate according to an embodiment of the present disclosure.
  • FIG. 2-4 is a schematic structural diagram of a light guide plate according to another embodiment of the present disclosure.
  • FIGS. 2-5 are schematic structural diagrams of another light guide plate according to another embodiment of the present disclosure.
  • 3-1 is a schematic diagram of a Hot Spot phenomenon in a backlight module in the prior art
  • 3-3 is a schematic diagram of a hot spot phenomenon in another backlight module in the prior art
  • 4-1 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure.
  • 4-2 is a schematic structural diagram of another backlight module according to an embodiment of the present disclosure.
  • 4-3 is a schematic structural diagram of still another backlight module according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram of a prism structure of a backlight module provided by an embodiment of the present disclosure having a light diffusion structure
  • FIG. 6 is a schematic diagram of a display device provided by an embodiment of the present disclosure.
  • FIG. 1 shows the structure of a backlight module.
  • the backlight module may include a light guide plate 01, a light bar 02, an optical film 03, a bezel 04, and a back plate 05.
  • the light guide plate 01 in the backlight module is generally in a rectangular parallelepiped structure.
  • the light bar 02 is opposite to one side of the light guide plate 01 (this side is the light incident side of the light guide plate) and the side surface is a smooth plane. Light emitted from the light bar 02 can be directly incident into the light guide plate 01 from the side and transmitted in the light guide plate.
  • the optical film 03 is disposed on the light outgoing side of the light guide plate 01.
  • Light bar 02 A part of the structure of the plastic frame 04 on the side is disposed on the edge of the optical film 03.
  • the plastic frame 04 on the side where the light bar 02 is located is an outer card structure and the structural strength is insufficient, the plastic frame 04 is squeezed.
  • a part of the light emitted by the light bar may directly escape from the backlight module without passing through the light guide plate, causing a hot spot phenomenon in the backlight module (for example, light exiting the side of the light guide plate near the light bar)
  • the bright area of the light column appears in the area, which causes uneven brightness and darkness. This affects the uniformity of the light output of the light guide plate, resulting in low optical quality of the backlight module.
  • a prism structure is disposed on a side surface of the light guide plate, and light emitted by a light source (for example, a light bar disposed on a light incident surface of the prism structure) is reflected by a reflective surface of the prism structure, so that the light is incident on the light guide plate.
  • a light source for example, a light bar disposed on a light incident surface of the prism structure
  • the light in the body is more uniform, so the Hot Spot phenomenon of the backlight module can be improved, thereby improving the optical quality of the backlight module.
  • a light guide plate 10 is provided. As shown in FIG. 2-1, the light guide plate 10 may include a light guide plate body 101 and a prism structure 102 at least one end of the light guide plate body 101.
  • the prism structure 102 can include a light incident surface 1021 and at least one reflective surface, and light incident from the light incident surface 1021 can be reflected by the at least one reflective surface into the light guide body 101.
  • the light guide plate body 101 and the prism structure 102 located at at least one end of the light guide plate body 101 may be formed in a unitary structure.
  • the prism structure 102 may also be a separate component that is independent of the light guide body 101 and that is attached to the light guide body 101.
  • the light guide plate body 101 may include a first face 1011 and a second face 1012 that is parallel to the first face.
  • the first surface 1011 can serve as a light exit surface of the light guide body
  • the second surface 1012 can include a dot structure for scattering light to serve as a dot surface of the light guide body, which facilitates more Light emerges from the light exit surface.
  • the light guide plate body 101 may have a rectangular parallelepiped structure.
  • other geometric shapes of the body of the light guide body are also possible, and those skilled in the art can select a suitable geometric shape according to actual needs, which is not limited herein.
  • the light guide plate 10 can be disposed in the side-entry backlight module, the prism structure 102 is disposed on the side of the light guide plate 10, and the light enters the prism structure 102 from the light incident surface of the prism structure 102, and passes through the prism structure.
  • the reflecting surface of 102 is reflected from the side surface of the light guide body 101 into the light guide plate body 101, and is reflected and/or scattered by the second surface 1012, and is then emitted from the first surface 1011.
  • a light guide plate provided by an embodiment of the present disclosure includes a light guide plate body and a prism structure at least one end of the light guide plate.
  • the light incident surface of the light guide plate is disposed in the prism structure, and the light incident from the light incident surface passes through the reflective surface in the prism structure. After the reflection, the light guide plate body is entered. Since the prism structure realizes the preliminary homogenization of the light by reflecting the light, the light incident into the body of the light guide plate can be made more uniform, thereby reducing the occurrence of the Hot Spot phenomenon of the backlight module, thereby improving the optical of the backlight module. quality.
  • the at least one reflective surface may include a first reflective surface 1022 and a second reflective surface 1023.
  • the first reflective surface 1022 is coupled to the first surface 1011, and the second reflective surface 1023 is coupled to the second surface 1012.
  • the light incident surface 1021 is not parallel to the second surface 1012, and the first reflective surface 1022 is not parallel to the light incident surface 1021.
  • the light incident from the light incident surface 1021 is reflected by the first reflective surface 1022 onto the second reflective surface 1023 and reflected by the second reflective surface 1023 into the light guide plate body 101.
  • the light incident from the light incident surface passes through the prism structure, is reflected from the first reflective surface to the second reflective surface, and is reflected by the second reflective surface to the light guide plate body, thereby achieving preliminary homogenization of the light.
  • the first reflective surface 1022 may be non-parallel to the first surface 1011, and the second reflective surface 1023 may be parallel to the second surface 1012.
  • the first reflective surface 1022 can be parallel to the first surface 1011, and the second reflective surface 1023 can be parallel to the second surface 1012.
  • the first reflective surface 1022 can be non-parallel to the first surface 1011 and the second reflective surface 1023 can be non-parallel to the second surface 1012.
  • the at least one reflective surface may further include a third reflective surface 1024 coupled to the light incident surface 1021 and the first reflective surface 1022, respectively.
  • the third reflecting surface 1024 can reflect a part of the light reflected by the first reflecting surface 1022 and the second reflecting surface 1023 into the prism structure, and limit the incident light to the prism as much as possible. In the structure, the utilization of light can be improved.
  • angle between the light incident surface and any reflective surface in the prism structure provided by the embodiment of the present disclosure and the angle between the respective reflective surfaces may be adjusted according to actual needs, and the parameters of the reflective surface may also be The actual needs need to be determined, and the embodiments of the present disclosure do not limit this.
  • At least one reflective surface of the prism structure 102 may include a fourth reflective surface 1025 that is connected to the first surface 1011 and is not parallel, and the fourth reflection Face 1025 is coplanar with second face 1012. The light incident from the light incident surface 1021 is reflected into the light guide plate body 101 through the fourth reflective surface 1025.
  • the light guide plate shown in FIG. 2-4 has a simple structure and can meet the requirement of homogenizing light in the prism structure, and only needs one reflective surface, which is convenient to manufacture.
  • a light diffusing structure can be disposed within the prism structure.
  • the light diffusing structure may include diffusing particles or bubbles 501.
  • Providing a light diffusing structure such as a diffusion particle or a bubble 501 in the prism structure allows the incident light to be scattered in the prism structure to better homogenize the light.
  • the light diffusing structure can be realized by doping particles in the prism structure different from the material of the light guide plate. Embodiments of the present disclosure do not limit the manner in which the light diffusing structure is disposed within the prism structure.
  • At least one reflective surface of the prism structure 102 may be formed of a reflective layer disposed on an outer surface of the prism structure.
  • the first reflective surface 1022 and the second reflective surface 1023 can be realized by attaching a reflective sheet to the outer surface of the prism structure.
  • the first reflective surface 1022 and the second reflective surface 1023 can also be realized by coating a layer of reflective material on the outer surface of the prism structure.
  • the plastic frame 04 on the side of the light bar 02 is an outer card structure and the structural strength is insufficient, the plastic frame 04 is pressed (such as the backlight module back or the panel).
  • the plastic frame 04 is pressed (such as the backlight module back or the panel).
  • a part of the structure of the frame 04 disposed on the edge of the optical film 03 may be separated from the edge of the optical film 03 to form a certain gap, as shown in FIG. 3-1, which may be Causes the light emitted by the light bar 02 to escape from the gap, or, as shown in FIG.
  • the light emitted by the light bar may be reflected by the plastic frame to the uppermost layer of the optical film; on the other hand, due to the optical film
  • the sheet 03 is composed of a multi-film layer such as a diffusion sheet and a brightness enhancement sheet, as shown in Fig. 3-3, there may be a gap between the film layer and the edge of the film layer, and the light emitted by the light bar 02 may be from the gap between the film layers. In the middle. All of the above phenomena may cause the Hot Spot phenomenon in the backlight module.
  • the reflective sheet may be an opaque reflective sheet.
  • diffusing particles may be disposed between the reflective layer and the outer surface of the prismatic structure.
  • the reflective layer is a reflective sheet attached to the outer surface of the prism structure
  • diffusion particles may be disposed on the reflective sheet, and then the reflective sheet provided with the diffusion particles may be disposed on the outer surface of the prism structure.
  • the diffusion particles may be disposed on the outer surface of the prism structure, and then the reflection sheet or the reflection layer is disposed on the outer surface of the prism structure having the diffusion particles.
  • the diffusion particles can have a diameter of from about 10 microns to about 30 microns.
  • the material of the diffusion particles may be polyethylene terephthalate (PET).
  • a backlight module is further provided, as shown in FIG. 4-1, comprising: a light bar 20 and a light guide plate 10.
  • the light guide plate may be the light guide plate 10 in any of the embodiments shown in FIGS. 2-1 to 2-5.
  • the light exit surface of the light bar 20 is opposed to the light incident surface 1021.
  • the light guide plate 10 may include a light guide plate body 101 and a prism structure 102 at at least one end of the light guide plate body 101.
  • the prism structure 102 can include a light incident surface 1021 and at least one reflective surface, and light incident from the light incident surface 1021 can be reflected by the at least one reflective surface into the light guide body 101.
  • the light guide plate body 101 and the prism structure 102 located at at least one end of the light guide plate body 101 may be formed in a unitary structure.
  • the prism structure 102 may also be a separate component that is independent of the light guide body 101 and that is fixed to the light guide body 101.
  • the backlight module provided by the embodiment of the present disclosure includes a light guide plate and a light bar.
  • the light incident surface of the light guide plate is disposed in the prism structure, and the light emitted by the light bar enters the prism structure from the light incident surface of the light guide plate, and passes through the prism structure.
  • the prism structure realizes the preliminary homogenization of the light by reflecting the light, the light incident into the light guide plate body can be made more uniform, thereby reducing the hot of the backlight module.
  • the generation of the Spot phenomenon improves the optical quality of the backlight module.
  • the emitting surface may include a first reflecting surface 1022 and a second reflecting surface 1023.
  • the first reflecting surface 1022 is connected to the first surface 1011, and the second reflecting surface 1023 is connected to the second surface 1012.
  • the light incident surface 1021 is not parallel to the second surface 1012, and the first reflective surface 1022 is not parallel to the light incident surface 1021.
  • the light incident from the light incident surface 1021 is reflected by the first reflective surface 1022 onto the second reflective surface 1023 and reflected by the second reflective surface 1023 into the light guide plate body 101.
  • a triangular platform may be formed at a corresponding position on the backboard to support and fix the light bar 20.
  • the at least one reflective surface may further include a third reflective surface 1024 coupled to the light incident surface 1021 and the first reflective surface 1022, respectively.
  • the third reflecting surface may reflect a part of the light reflected by the first reflecting surface and the second reflecting surface into the prism structure to confine the incident light in the prism structure, thereby improving the light. Utilization rate.
  • At least one reflective surface of the light guide plate of the backlight module may include a fourth reflective surface 1025, and the light incident surface 1021 is connected to the first surface 1011 and is not parallel.
  • the fourth reflecting surface 1025 is coplanar with the second surface 1012. The light incident from the light incident surface 1021 is reflected into the light guide plate body 101 through the fourth reflective surface 1025.
  • the light exit surface of the light bar 20 is parallel to the light incident surface 1021.
  • the backlight module shown in FIG. 4-3 has a simple structure and can meet the requirement of homogenizing light in the prism structure, and only needs one reflecting surface, which is convenient to manufacture.
  • FIG. 6 shows a schematic diagram of a display device provided by an embodiment of the present disclosure.
  • the display device 50 can include a backlight module 40.
  • the backlight module 40 can be the backlight module described in any of the embodiments illustrated in FIGS. 4-1 to 4-3.
  • the display device provided by the embodiment of the present disclosure may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • a display device provided by an embodiment of the present disclosure includes a backlight module.
  • the backlight module comprises a light guide plate and a light bar.
  • the light incident surface of the light guide plate is disposed in the prism structure, and the light emitted by the light bar enters the prism structure from the light incident surface of the light guide plate, and is reflected by the reflective surface in the prism structure. Enter the light guide body. Since the prism structure realizes the preliminary homogenization of light by reflecting the light, the incident can be made to The light in the body of the light guide plate is more uniform, so that the occurrence of the Hot Spot phenomenon of the backlight module can be reduced, thereby improving the optical quality of the backlight module.

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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)
  • Planar Illumination Modules (AREA)

Abstract

一种导光板、背光模组及显示装置。导光板（10）包括：导光板本体（101）和位于导光板本体（101）至少一端的棱镜结构（102），其中棱镜结构（102）包括入光面（1021）和至少一个反射面（1022,1023），从入光面（1021）入射的光能够由至少一个反射面（1022,1023）反射至导光板本体（101）内。

Description

导光板、背光模组及显示装置
相关申请的交叉引用
本申请要求于2017年01月03日递交的中国专利申请第201710002393.3号的优先权和权益，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开涉及显示技术领域，特别涉及一种导光板、背光模组及显示装置。
背景技术
背光模组(Back Light Module)是固定于液晶显示器(Liquid Crystal Display，LCD)背后的一种光源。背光模组中通常采用灯条(Light Bar，L/B)(也即是发光二极管(Light-Emitting Diode，LED))作为发光源。背光模组包括导光板。灯条发出的光通过导光板进行传输，因此，导光板对光的传输效果直接影响到背光模组的光学品质。
发明内容
本公开的实施例提供了一种导光板、背光模组及显示装置，能够改善背光模组中出现的Hot Spot现象，提高导光板出光的均匀性，从而提高背光模组的光学品质。
在本公开的第一方面，提供了一种导光板。所述导光板包括：导光板本体和位于所述导光板本体的至少一端的棱镜结构，其中，所述棱镜结构包括入光面和至少一个反射面，从所述入光面入射的光能够由所述至少一个反射面反射至所导光板本体内。
在一个实施例中，所述导光板本体包括第一面和与所述第一面相对的第二面，其中所述第一面为出光面。所述至少一个反射面包括第一反射面和第二反射面，所述第一反射面与所述第一面连接，并且所述第二反射面 与所述第二面连接。所述入光面与所述第二面不平行，所述第一反射面与所述入光面不平行，由所述入光面入射的光通过所述第一反射面反射至所述第二反射面上，由所述第二反射面反射至所述导光板本体内。
在一个实施例中，所述至少一个反射面还包括分别与所述入光面和所述第一反射面连接的第三反射面。
在一个实施例中，所述至少一个反射面包括第四反射面，所述入光面与所述第一面连接且不平行，所述第四反射面与所述第二面共面，由所述入光面入射的光通过所述第四反射面反射至所述导光板本体内。
在一个实施例中，所述棱镜结构内设置有光扩散结构。
在一个实施例中，所述光扩散结构包括扩散粒子或气泡。
在一个实施例中，所述导光板本体和所述棱镜结构被形成为一体结构。
在一个实施例中，所述至少一个反射面由设置在所述棱镜结构的外表面的反射层形成。
在一个实施例中，在所述反射层和所述棱镜结构的所述外表面之间设置有扩散粒子。
在一个实施例中，所述扩散粒子的材质包括聚对苯二甲酸乙二醇酯。
在一个实施例中，所述扩散粒子的直径范围为约10微米至约30微米。
在本公开的第二方面，提供了一种背光模组。该背光模组包括：灯条和本文中任一实施例描述的导光板，其中，所述灯条的光出射面与所述入光面相对。
在本公开的第三方面，提供了一种显示装置，包括：本文中任一实施例描述的背光模组。
附图说明
为了更清楚地说明本公开的实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍。显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。在附图中：
图1是一种背光模组的结构示意图；
图2-1是本公开的实施例提供的一种导光板的结构示意图；
图2-2是本公开的实施例提供的另一种导光板的结构示意图；
图2-3是本公开的实施例提供的又一种导光板的结构示意图；
图2-4是本公开的另一实施例提供的一种导光板的结构示意图；
图2-5是本公开的另一实施例提供的另一种导光板的结构示意图；
图3-1是现有技术中的一种背光模组出现Hot Spot现象的示意图；
图3-2是现有技术中的另一种背光模组出现Hot Spot现象的示意图；
图3-3是现有技术中的又一种背光模组出现Hot Spot现象的示意图；
图4-1是本公开的实施例提供的一种背光模组的结构示意图；
图4-2是本公开的实施例提供的另一种背光模组的结构示意图；
图4-3是本公开的实施例提供的又一种背光模组的结构示意图；
图5是本公开的实施例提供的背光模组的棱镜结构中具有光扩散结构的示意图；以及
图6是本公开的实施例提供的显示装置的示意图。
贯穿这些附图的各个视图，相应的参考编号指示相应的部件或特征。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本公开的实施方式作进一步地详细描述。
除非上下文中另外明确地指出，否则在本文和所附权利要求中所使用的词语的单数形式包括复数，反之亦然。因而，当提及单数时，通常包括相应术语的复数。相似地，措辞“包含(comprise)”、“包含(include)”以及它们的语法变型将解释为包含在内而不是独占性地，除非本文中明确禁止这样的解释。在本文中使用术语“实例”之处，特别是当其位于一组术语之后时，所述“实例”仅仅是示例性的和阐述性的，且不应当被认为是独占性的或广泛性的。
图1示出一种背光模组的结构。该背光模组可以包括导光板01、灯条02、光学膜片03、胶框04和背板05。背光模组中的导光板01通常为长方体结构。灯条02正对着导光板01的一个侧面(该侧面即为导光板的入光侧)且该侧面为一光滑平面。灯条02发出的光可以从该侧面直射入导光板01中并在导光板内传输。光学膜片03设置在导光板01的出光侧。灯条02 所在侧的胶框04的部分结构设置在光学膜片03的边缘上。
然而，在图1所示的结构中，由于灯条02正对着导光板01的侧面，并且灯条02所在侧的胶框04为外卡结构且结构强度不足，在胶框04受到挤压发生变形时，灯条发出的光中的一部分可能会不经过导光板而直接从背光模组中逸出，导致背光模组出现Hot Spot现象(例如，在导光板靠近灯条的一侧的出光区出现光柱亮区，而产生亮暗不匀的现象)，这影响了导光板出光的均匀性，造成背光模组的光学品质较低。
在本公开的实施例中，在导光板的侧面设置棱镜结构，由光源(例如设置在棱镜结构的入光面的灯条)发出的光通过棱镜结构的反射面反射，可以使得入射至导光板本体中的光更加均匀，因此能够改善背光模组的Hot Spot现象，从而可以提高背光模组的光学品质。
在本公开的一个方面，提供了一种导光板10。如图2-1所示，该导光板10可以包括：导光板本体101和位于导光板本体101至少一端的棱镜结构102。棱镜结构102可以包括入光面1021和至少一个反射面，从入光面1021入射的光能够由至少一个反射面反射至所导光板本体101内。
在本公开的实施例中，导光板本体101和位于导光板本体101至少一端的棱镜结构102可以被形成为一体结构。替代地，棱镜结构102也可以为独立于导光板本体101之外并且被附着到导光板本体101上的单独部件。
在本公开的实施例中，导光板本体101可以包括第一面1011和与第一面平行的第二面1012。在一个实施例中，第一面1011可以作为导光板本体的出光面，第二面1012可以包括用于散射光的网点结构，以作为导光板本体的网点面，该网点结构有利于更多的光从出光面出射。
在本公开的实施例中，导光板本体101可以为长方体结构。然而，导光体本体的其他几何形状也是可以行的，本领域技术人员可以根据实际需要选择合适的几何形状，本文对此不做限定。
在该实施例中，该导光板10可以设置在侧入式背光模组中，棱镜结构102设置在导光板10的侧面，光从棱镜结构102的入光面进入棱镜结构102中，经过棱镜结构102的反射面反射后从导光体本体101的侧面进入导光板本体101内，通过第二面1012的反射和/或散射后，可以从第一面1011射出。
本公开的实施例提供的导光板，包括导光板本体和位于导光板至少一端的棱镜结构，导光板的入光面设置在棱镜结构中，从入光面入射的光经过棱镜结构中的反射面的反射后进入导光板本体。由于棱镜结构通过对光的反射实现了光的初步匀化，可以使得入射至光导板本体中的光更为均匀，因此可以减少背光模组的Hot Spot现象的产生，从而提高背光模组的光学品质。
在一个实施例中，如图2-1所示，该至少一个反射面可以包括第一反射面1022和第二反射面1023。第一反射面1022与第一面1011连接，并且第二反射面1023与第二面1012连接。入光面1021与第二面1012不平行，并且第一反射面1022与入光面1021不平行。由入光面1021入射的光通过第一反射面1022反射至第二反射面1023上，并由第二反射面1023反射至导光板本体101内。
在该实施例中，从入光面入射的光经过棱镜结构后，由第一反射面反射至第二反射面，再由第二反射面反射至导光板本体，实现了对光的初步匀化，提高了背光模组的光学品质。
在一个实施例中，如图2-1所示，第一反射面1022可以与第一面1011不平行，第二反射面1023可以与第二面1012平行。在另一个实施例中，如图2-2所示，第一反射面1022可以与第一面1011平行，并且第二反射面1023可以与第二面1012平行。在又一实施例中，第一反射面1022可以与第一面1011不平行，并且第二反射面1023可以与第二面1012不平行。
在可替代的实施例中，如图2-3所示，该至少一个反射面还可以包括分别与入光面1021和第一反射面1022连接的第三反射面1024。
在如图2-1所示的导光板中，入射到棱镜结构中的一部分光经过反射面的反射后可能会从入光面与第一反射面的边缘逸出，造成潜在的光浪费。在图2-3所示的结构中，第三反射面1024可以将经过第一反射面1022和第二反射面1023反射的光中的一部分反射至棱镜结构中，尽可能将入射光限制在棱镜结构中，因此可以提高光的利用率。
需要说明的是，本公开的实施例提供的棱镜结构中的入光面与任一反射面之间的角度以及各个反射面之间的角度可以根据实际需要进行调节，反射面的参数也可以根据实际需要确定，本公开的实施例对此不作限定。
在可替代的实施例中，如图2-4所示，棱镜结构102中的至少一个反射面可以包括第四反射面1025，入光面1021与第一面1011连接且不平行，第四反射面1025与第二面1012共面。由入光面1021入射的光通过第四反射面1025反射至导光板本体101内。
图2-4所示的导光板的结构简单，且可以满足在棱镜结构中对光进行均匀化的需要，只需要一个反射面，制作方便。
在可选的实施例中，棱镜结构内可以设置光扩散结构。作为示例，如图5所示，光扩散结构可以包括扩散粒子或气泡501。在棱镜结构中设置诸如扩散粒子或气泡501的光扩散结构，可以使入射的光在棱镜结构中发生散射，更好的使光均匀化。在一个实施例中，可以通过在棱镜结构中掺杂与导光板的材质不同的粒子来实现光扩散结构。本公开的实施例对在棱镜结构内设置光扩散结构的方式不做限定。
在本公开的实施例中，棱镜结构102的至少一个反射面可以由设置在棱镜结构的外表面的反射层形成。如图2-5所示，第一反射面1022和第二反射面1023可以通过在棱镜结构的外表面上贴附反射片来实现。可替代地，第一反射面1022和第二反射面1023也可以通过在棱镜结构的外表面上涂覆反射材料层来实现。
在如图1所示的背光模组中，一方面，由于灯条02所在侧的胶框04为外卡结构且结构强度不足，在胶框04受到挤压(如背光模组后仰或者面板与背板05卡合不良)时，设置在光学膜片03边缘上的胶框04的部分结构会与光学膜片03的边缘分离，形成一定的缝隙，如图3-1所示，可能会导致灯条02发出的光从该缝隙中逸出，或者，如图3-2所示，灯条发出的光可能会由胶框反射至光学膜片的最上层；另一方面，由于光学膜片03由扩散片和增光片等多膜层组成，如图3-3所示，膜层与膜层的边缘之间可能存在缝隙，灯条02发出的光可能会从膜层之间的缝隙中逸出。上述现象都可能导致背光模组出现Hot Spot现象。
在本公开的实施例中，由于从入光面入射的光在棱镜结构中经过多个反射面的反射，光在到达导光板本体的第一面边缘时已经初步匀化，即使光从导光板的第一面的边缘逸出，也会减少背光模组的Hot Spot现象的产生。此外，在如图2-5所示的实施例中，由于反射面外面贴附有反射片， 光无法从棱镜结构的反射面所在位置逸出，因此导光板的第一面在180度内都无法直接接触到灯条发出的光，因此可以有效避免Hot Spot现象的产生。根据本发明的实施例，该反射片可以为不透明反射片。
在一个实施例中，可以在反射层和棱镜结构的外表面之间设置扩散粒子。示例地，在反射层为贴附在棱镜结构的外表面上的反射片的情况下，可以在反射片上设置扩散粒子，然后将设置有扩散粒子的反射片设置在棱镜结构的外表面上。可替代地，还可以将扩散粒子设置在棱镜结构的外表面上，然后将反射片或反射层设置在具有扩散粒子的棱镜结构的外表面上。在反射层和棱镜结构的外表面之间设置扩散粒子，可以使反射面在反射光的同时使光发生散射，更好的使光均匀化。
在一个实施例中，该扩散粒子的直径可以为约10微米至约30微米。该扩散粒子的材质可以是聚对苯二甲酸乙二醇酯(Polyethylene terephthalate，PET)。
在本公开的另一方面，还提供一种背光模组，如图4-1所示，包括：灯条20和导光板10。该导光板可以是图2-1至图2-5中示出的任一实施例中的导光板10。灯条20的光出射面与入光面1021相对。
该导光板10可以包括：导光板本体101和位于导光板本体101至少一端的棱镜结构102。棱镜结构102可以包括入光面1021和至少一个反射面，从入光面1021入射的光能够由至少一个反射面反射至所导光板本体101内。
在本公开的实施例中，导光板本体101和位于导光板本体101至少一端的棱镜结构102可以被形成为一体结构。替代地，棱镜结构102也可以为独立于导光板本体101之外并且被固定到导光板本体101上的单独部件。
本公开的实施例提供的背光模组，包括导光板和灯条，导光板的入光面设置在棱镜结构中，灯条发出的光从导光板的入光面进入棱镜结构内，经过棱镜结构中的反射面的反射后进入导光板本体，由于棱镜结构通过对光的反射实现了光的初步匀化，可以使得入射至光导板本体中的光更为均匀，因此可以减少背光模组的Hot Spot现象的产生，从而提高了背光模组的光学品质。
在一个实施例中，如图4-1所示，背光模组的导光板上的至少一个反 射面可以包括第一反射面1022和第二反射面1023，第一反射面1022与第一面1011连接，第二反射面1023与第二面1012连接。入光面1021与第二面1012不平行，并且第一反射面1022与入光面1021不平行。由入光面1021入射的光通过第一反射面1022反射至第二反射面1023上，并由第二反射面1023反射至导光板本体101内。
在本公开的实施例中，在制造背光模组中的背板时，可以在背板上对应的位置成型一个三角状的平台，以支撑并固定灯条20。
在可替代的实施例中，如图4-2所示，该至少一个反射面还可以包括分别与入光面1021和第一反射面1022连接的第三反射面1024。在该实施例中，第三反射面可以将经过第一反射面和第二反射面反射的光中的一部分光反射至棱镜结构中，以将入射光限制在棱镜结构中，因此可以提高光的利用率。
在可替代的实施例中，如图4-3所示，背光模组的导光板上的至少一个反射面可以包括第四反射面1025，入光面1021与第一面1011连接且不平行，第四反射面1025与第二面1012共面。由入光面1021入射的光通过第四反射面1025反射至导光板本体101内。灯条20的光出射面与入光面1021平行。
图4-3所示的背光模组的结构简单，且可以满足在棱镜结构中对光进行均匀化的需要，只需要一个反射面，制作方便。
在本公开的又一方面，提供一种显示装置。图6示出本公开实施例提供的显示装置的示意图。如图6所示，该显示装置50可以包括背光模组40。该背光模组40可以是图4-1至图4-3示出的任一实施例描述的背光模组。
在本公开的实施例中，本公开的实施例提供的显示装置可以为手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
本公开的实施例提供的显示装置包括背光模组。该背光模组包括导光板和灯条，导光板的入光面设置在棱镜结构中，灯条发出的光从导光板的入光面进入棱镜结构内，经过棱镜结构中的反射面的反射后进入导光板本体。由于棱镜结构通过对光的反射实现了光的初步匀化，可以使得入射至 光导板本体中的光更为均匀，因此可以减少背光模组的Hot Spot现象的产生，从而提高了背光模组的光学品质。
以上为了说明和描述的目的提供了实施例的前述描述。其并不旨在是穷举的或者限制本申请。特定实施例的各个元件或特征通常不限于特定的实施例，但是，在合适的情况下，这些元件和特征是可互换的并且可用在所选择的实施例中，即使没有具体示出或描述。同样也可以以许多方式来改变。这种改变不能被认为脱离了本申请，并且所有这些修改都包含在本申请的范围内。

Claims (14)

  1. 一种导光板，包括：
    导光板本体和位于所述导光板本体的至少一端的棱镜结构，
    其中，所述棱镜结构包括入光面和至少一个反射面，并且从所述入光面入射的光能够由所述至少一个反射面反射至所导光板本体内。
  2. 根据权利要求1所述的导光板，其中，所述导光板本体包括第一面和与所述第一面相对的第二面，其中所述第一面为所述导光板本体的出光面；
    所述至少一个反射面包括第一反射面和第二反射面，所述第一反射面与所述第一面连接，所述第二反射面与所述第二面连接，
    所述入光面与所述第二面不平行，所述第一反射面与所述入光面不平行，由所述入光面入射的光通过所述第一反射面反射至所述第二反射面上，由所述第二反射面反射至所述导光板本体内。
  3. 根据权利要求2所述的导光板，其中所述至少一个反射面还包括分别与所述入光面和所述第一反射面连接的第三反射面。
  4. 根据权利要求1所述的导光板，其中，所述至少一个反射面包括第四反射面，所述入光面与所述第一面连接且不平行，所述第四反射面与所述第二面共面；
    由所述入光面入射的光通过所述第四反射面反射至所述导光板本体内。
  5. 根据权利要求1至4任一所述的导光板，其中所述棱镜结构内设置有光扩散结构。
  6. 根据权利要求5所述的导光板，其中所述光扩散结构包括扩散粒子或气泡。
  7. 根据权利要求1至4任一所述的导光板，其中所述导光板本体和所述棱镜结构被形成为一体结构。
  8. 根据权利要求7所述的导光板，其中所述至少一个反射面由设置在所述棱镜结构的外表面的反射层形成。
  9. 根据权利要求8所述的导光板，其中在所述反射层和所述棱镜结构的所述外表面之间设置有扩散粒子。
  10. 根据权利要求9所述的导光板，其中所述扩散粒子的材质包括聚对苯二甲酸乙二醇酯。
  11. 根据权利要求9所述的导光板，其中所述扩散粒子的直径为约10微米至约30微米。
  12. 根据权利要求2所述的导光板，其中所述第二面包括网点结构。
  13. 一种背光模组，包括：灯条和权利要求1至12任一所述的导光板,其中，所述灯条的光出射面与所述入光面相对。
  14. 一种显示装置，包括：权利要求13所述的背光模组。
PCT/CN2017/098758 2017-01-03 2017-08-24 导光板、背光模组及显示装置 WO2018126705A1 (zh)

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