WO2017118064A1 - 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
WO2017118064A1
WO2017118064A1 PCT/CN2016/097851 CN2016097851W WO2017118064A1 WO 2017118064 A1 WO2017118064 A1 WO 2017118064A1 CN 2016097851 W CN2016097851 W CN 2016097851W WO 2017118064 A1 WO2017118064 A1 WO 2017118064A1
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WIPO (PCT)
Prior art keywords
guide plate
light
light guide
astigmatism
incident surface
Prior art date
Application number
PCT/CN2016/097851
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English (en)
French (fr)
Inventor
解晓丽
应文涛
Original Assignee
京东方科技集团股份有限公司
京东方光科技有限公司
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Application filed by 京东方科技集团股份有限公司, 京东方光科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/511,618 priority Critical patent/US10203551B2/en
Publication of WO2017118064A1 publication Critical patent/WO2017118064A1/zh

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Classifications

    • 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
    • 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
    • G02B6/0023—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
    • G02B6/0028—Light guide, e.g. taper
    • 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
    • G02B6/005—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
    • G02B6/0051—Diffusing 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
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133604—Direct backlight with lamps
    • 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
    • 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
    • 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
    • G02B6/0025—Diffusing sheet or layer; Prismatic 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
    • G02B6/0075—Arrangements of multiple light guides

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 backlight module of the liquid crystal display device is mainly divided into a direct type and a side type.
  • the side-lit backlight module generally adopts a light guide plate structure, wherein the light guide plate enables the line source emitted by the backlight to be converted into a surface light source. Therefore, the light guide plate is currently a more critical part of the display device using the side-lit backlight module.
  • the present disclosure provides a light guide plate, a backlight module, and a display device for improving the uniformity of the light output of the light guide plate and reducing the occurrence of uneven brightness and cross beam of the display device.
  • the present disclosure provides a light guide plate.
  • the light incident surface of the light guide plate is provided with a plurality of first light diffusing units, and at least one astigmatism structure is disposed in a direction away from the light incident surface in a range of the set region in the light guide plate.
  • the light guide plate provided by the present disclosure by providing a plurality of first astigmatism units and at least one astigmatism structure on the light incident surface, the light emitted by the light source is better diffused after passing through the light guide plate, and before entering the display panel. Become more even.
  • the light guide plate provided by the present disclosure can contribute to improving the uniformity of the light output of the light guide plate and reducing the phenomenon of uneven brightness and cross beam of the display device.
  • the set area ranges from the light entrance surface Length range from 1.2 mm to 2.8 mm.
  • the astigmatism structure comprises a hollow astigmatism structure, the hollow astigmatism structure facing at least one side of the light incident surface and/or at least one side of the hollow astigmatism structure facing away from the light incident surface
  • One is provided with a plurality of second astigmatism units.
  • the astigmatism structure may be a hollow astigmatism structure, and the second astigmatism unit may be disposed only on a side of the hollow astigmatism structure facing the light incident surface or facing away from the light incident surface, or may be disposed on a side of the hollow astigmatism structure facing the light incident surface and A second astigmatism unit is disposed on one side facing away from the illuminating surface.
  • each of the hollow astigmatism structures has a depth of from 0.5 mm to 0.6 mm in a direction away from the light incident surface.
  • the hollow astigmatism structure comprises a single hollow astigmatism structure arranged along an arrangement direction of a plurality of light sources, the plurality of light sources configured to provide light incident on a light incident surface of the light guide plate And a length of the single hollow astigmatism structure along an arrangement direction of the plurality of light sources is greater than or equal to an overall arrangement length of the plurality of light sources.
  • the hollow astigmatism structure is the same as the number of the plurality of light sources and the positions are in one-to-one correspondence, and the plurality of light sources are configured to provide the incident light incident on the light guide plate The light on the surface.
  • the provision of a plurality of hollow astigmatism structures can further improve the uniformity of the light output of the light guide plate.
  • the plurality of first astigmatism units disposed on the light incident surface of the light guide plate are arranged along an arc.
  • the plurality of second astigmatism units in the astigmatism structure of the light guide plate are arranged in an arc.
  • each of the first astigmatism units has a microstructure, and a projection of each of the first astigmatism units on a plane perpendicular to a light incident surface of the light guide plate includes an arc At least one of a shape, an isosceles triangle, an isosceles trapezoid, and a curved shape.
  • the radius of the circular arc projection is 0.05 mm. Between ⁇ 0.06 mm.
  • the projection of the first astigmatism unit on a plane perpendicular to the light incident surface of the light guide plate includes an isosceles trapezoid
  • the base angle of the projection of the isosceles trapezoid is 30 degrees to 60 degrees.
  • the height is 0.03 mm to 0.05 mm.
  • the apex angle of the isosceles triangle is 60 degrees to 70 degrees, and the height is 0.03 mm to 0.04 mm.
  • the shapes of the plurality of first astigmatism units on the light incident surface of the light guide plate are different, and the shapes of the plurality of second astigmatism units in the astigmatism structure are different. .
  • the uniformity of the light output of the light guide plate can be further improved.
  • the present disclosure also provides a backlight module including: a light source, and any one of the above light guide plates, wherein the plurality of light sources are configured to provide light incident on a light incident surface of the light guide plate. Since the light-emitting uniformity of the light guide plate is high, the backlight module provided by the present disclosure also has better light-emitting uniformity.
  • the backlight module further includes: a back plate on a side of the light source facing away from the light guide plate, and a side of the back plate facing the light source is provided with a reflective film layer.
  • the reflective film layer may be coated on one side of the diffusion sheet against the light guide plate, extended to the light source and completely covering the upper portion of the light surface.
  • the reflective film layer can also be applied over the extension of the flexible circuit board and also needs to completely cover the upper portion of the light surface. Thereby, the light emitted from the light source is prevented from being emitted before entering the screen display area to become invalid light.
  • each of the light sources is an LED light.
  • the present disclosure also provides a display device including: a display panel, and any one of the above backlight modules. Since the backlight module has better light uniformity, the display panel provided by the present disclosure has a better display effect.
  • FIG. 1 is a schematic structural diagram of a light guide plate according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of another light guide plate according to an embodiment of the present disclosure.
  • FIG. 3 is a schematic structural diagram of still another light guide plate according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of still another light guide plate according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of another light guide plate according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of still another light guide plate according to an embodiment of the present disclosure.
  • FIG. 7 is a structure of a plurality of first astigmatism units arranged along an arc according to an embodiment of the present disclosure. schematic diagram
  • FIG. 8 is a schematic structural diagram of a plurality of first astigmatism units arranged along a line according to an embodiment of the present disclosure
  • FIG. 9 is a schematic structural view of a first astigmatism unit on a light incident surface of a light guide plate provided by the present disclosure.
  • FIG. 10 is a schematic structural view of another first astigmatism unit on a light incident surface of a light guide plate provided by the present disclosure
  • FIG. 11 is a schematic structural view of still another first astigmatism unit on the light incident surface of the light guide plate provided by the present disclosure
  • FIG. 12 is a schematic structural view of still another first astigmatism unit on the light incident surface of the light guide plate provided by the present disclosure
  • FIG. 13 is a schematic structural diagram of a plurality of first astigmatism units on a light incident surface of a light guide plate provided by the present disclosure
  • FIG. 15 is a astigmatism diagram of a light guide plate provided by the present disclosure.
  • 1 denotes a light guide plate
  • 11 denotes a light entrance surface
  • 2 denotes a first astigmatism unit
  • 3 denotes a second astigmatism unit
  • 4 denotes an astigmatism structure
  • 5 denotes a light source.
  • FIG. 1 is a schematic structural diagram of a light guide plate according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of another light guide plate according to an embodiment of the present disclosure
  • the present disclosure provides a light guide plate 1.
  • the light-incident surface 11 of the light guide plate 1 is provided with a plurality of first astigmatism units 2, and at least one astigmatism structure 4 is provided in a direction away from the light-incident surface 11 in a range of the set region within the light guide plate 1.
  • the light guide plate 1 provided by the present disclosure by providing a plurality of first astigmatism units 2 and at least one astigmatism structure 4 on the light incident surface 11, the light emitted from the light source 5 is better diffused after passing through the light guide plate 1, and It becomes more uniform before entering the display panel.
  • the light guide plate 1 provided by the present disclosure can contribute to improving the light uniformity of the light guide plate 1 and is reduced.
  • the display device has uneven brightness and cross beam.
  • the set region ranges from 111.2 mm to 2.8 mm from the light incident surface.
  • the astigmatism effect of the light guide plate is most uniform.
  • FIG. 14 is a astigmatism effect diagram of a light guide plate in the prior art
  • FIG. 15 is a astigmatism effect diagram of the light guide plate provided by the present disclosure.
  • the astigmatism effect of the light guide plate provided by the present disclosure is more uniform.
  • the astigmatic structure 4 comprises a hollow astigmatism structure.
  • a plurality of second astigmatism units 3 are disposed on a side of the hollow astigmatism structure facing the light incident surface 11 and a side of the hollow astigmatism structure facing away from the light incident surface 11.
  • the astigmatic structure 4 can be a hollow astigmatism structure.
  • the second astigmatism unit 3 may be provided only on the side of the hollow astigmatism structure facing the light incident surface 11 or the side facing away from the light incident surface 11.
  • the second astigmatism unit 3 may be provided on both the side of the hollow astigmatism structure facing the light entrance surface 11 and the side facing away from the light entrance surface 11.
  • the hollow astigmatism structure comprises a single hollow astigmatism structure arranged along the arrangement direction of the plurality of light sources 5, wherein such a plurality of light sources 5 are configured to provide incident on the light incident surface 11 of the light guide plate 1. Light. Moreover, the length of such a single hollow astigmatism structure in the direction in which the plurality of light sources 5 are arranged is greater than or equal to the overall arrangement length of the plurality of light sources 5.
  • the hollow astigmatism structure is the same as the number of the plurality of light sources 5 and the positions are in one-to-one correspondence.
  • a plurality of light sources 5 are configured to provide light incident on the light incident surface 11 of the light guide plate 1.
  • the plurality of hollow astigmatism structures are provided to further improve the light uniformity of the light guide plate 1.
  • FIG. 4 is a schematic structural diagram of still another light guide plate according to an embodiment of the present disclosure
  • FIG. 5 is a schematic structural diagram of still another light guide plate according to an embodiment of the present disclosure
  • the plurality of first astigmatism units 2 on the light incident surface of the light guide plate 1 may be continuous or spaced.
  • the plurality of first astigmatism units may be arranged along an arc or may be arranged along a straight line.
  • FIG. 7 is a schematic structural diagram of a plurality of first astigmatism units arranged along an arc according to an embodiment of the present disclosure; The structural schematic diagram of a plurality of first astigmatism units arranged along a straight line is provided.
  • the angle between the normal and the horizontal plane becomes smaller, the angle ⁇ increases, and ⁇ also increases.
  • the angle at which the outgoing light is deflected is larger, and the astigmatism of the scattering unit is stronger. It can be seen that the astigmatism of the light is good in the manner in which the astigmatism units are arranged along the arc.
  • each hollow astigmatism structure is preferably from 0.5 mm to 0.6 mm in a direction away from the light incident surface 11.
  • FIG. 9 is a schematic structural view of a first astigmatism unit on a light incident surface of a light guide plate provided by the present disclosure
  • FIG. 11 is a schematic structural view of still another first astigmatism unit on the light incident surface of the light guide plate provided by the present disclosure
  • FIG. 12 is a light guide plate provided by the present disclosure.
  • Each of the first astigmatism units 2 has a microstructure. Moreover, the projection of each of the first astigmatism units 2 on a plane perpendicular to the light incident surface 11 of the light guide plate 1 (for example, the cross section shown in the drawing) includes a circular arc shape, an isosceles triangle, an isosceles trapezoid, and a curve. At least one of the shapes.
  • the radius of the projection of the circular arc shape is between 0.05 mm and 0.06 mm.
  • the astigmatism unit 2 when the astigmatism unit 2 is in a plane perpendicular to the light incident surface 11 of the light guide plate 1
  • the projection includes an isosceles trapezoid, as shown in FIG. 11, the base angle c of the projection of the isosceles trapezoid is 30 degrees to 60 degrees, and the height h is 0.03 mm to 0.05 mm.
  • the projection of the astigmatism unit 2 on the plane perpendicular to the light incident surface 11 of the light guide plate 1 includes an isosceles triangle, as shown in FIG. 12, the apex angle d of the projection of the isosceles triangle is 60 degrees ⁇ 70 degrees and a height g of 0.03 mm to 0.04 mm.
  • the astigmatism effect of the astigmatism unit can be improved by using the definition of some of the above parameters.
  • FIG. 13 it is a schematic structural diagram of a plurality of first astigmatism units on a light incident surface of a light guide plate provided by the present disclosure.
  • the shapes of the plurality of first astigmatism units 2 disposed on the light incident surface 11 of the light guide plate 1 are different, and the shapes of the plurality of second astigmatism units 3 in the astigmatism structure 4 are different.
  • the light uniformity of the light guide plate 1 can be further improved by the use of the first astigmatism unit 2 and the second astigmatism unit 3 of different shapes.
  • the present disclosure also provides a backlight module including: a light source 5, and any one of the above light guide plates 1. Since the light-emitting uniformity of the light guide plate 1 is high, the backlight module provided by the present disclosure also has better light-emitting uniformity.
  • the backlight module further includes:
  • the light source 5 faces away from the back plate on one side of the light guide plate, and a side of the back plate facing the light source 5 is provided with a reflective film layer.
  • the reflective film layer may be coated on the side of the diffusion sheet that is in close contact with the light guide plate, extended to the hollow astigmatism structure and completely covers the upper portion of the light surface.
  • the reflective film layer can also be applied over the extension of the flexible circuit board and also needs to completely cover the upper portion of the light surface.
  • each of the light sources 5 is an LED light.
  • the present disclosure also provides a display device including: a display panel, and any one of the above backlight modules. Since the backlight module has better light uniformity, the display panel provided by the present disclosure has a better display effect.
  • the display device may be any product or component having a display function such as a notebook computer display, an electronic paper, a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet computer, or the like.
  • a display function such as a notebook computer display, an electronic paper, a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet computer, or the like.

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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)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

一种导光板（1）、背光模组及显示装置，用以提高导光板（1）出光的均匀性，减少显示装置亮暗不均和交叉光束的现象的发生。导光板（1）的入光面（11）设有多个第一散光单元（2），并且在导光板（1）内的设定区域范围中沿远离入光面（11）的方向设有至少一个散光结构（4）。在上述导光板（1）中，通过在入光面（11）设置多个第一散光单元（2）以及至少一个散光结构（4），使得光源（5）发出的光在经过导光板（1）后会更好地扩散，并且在进入显示面板前变得更加均匀。

Description

导光板、背光模组及显示装置 技术领域
本公开涉及显示技术领域，并且特别涉及导光板、背光模组及显示装置。
背景技术
目前，液晶显示装置的背光模组主要分为直下式和侧入式。侧入式的背光模组普遍采用导光板结构，其中导光板使得背光源发出的线光源能够转换成为面光源。因此，导光板目前是采用侧入式的背光模组的显示装置中较为关键的部分。
近年来，随着显示领域的快速发展，“超薄”、“高亮”、“窄边框”已成为高端显示市场的必然要求，但是这也会产生一些光学上的问题。譬如，为了提升显示器的亮度，在背光源的导光板上做一些微结构处理，以增加光能利用率。但是，这容易产生“交叉光束”(如由导光板出光面上的V沟结构的聚光造成的交叉光束)等问题。另外，由于边框尺寸的减小、LED灯数目的不足，使得LED光源发出的光在还没有得到充分混合就进入画面区。这已经超出网点的亮度可调节范围，从而导致显示画面区内灯前亮暗不均的问题。
发明内容
本公开提供了导光板、背光模组及显示装置，用以提高导光板出光的均匀性，减少显示装置亮暗不均和交叉光束的现象的发生。
本公开提供了一种导光板。所述导光板的入光面设有多个第一散光单元，并且在所述导光板内的设定区域范围中沿远离所述入光面的方向设有至少一个散光结构。
在本公开提供的导光板中，通过在入光面上设置多个第一散光单元以及至少一个散光结构，使得光源发出的光在经过导光板后会更好地扩散，并且在进入显示面板前变得更加均匀。这样，本公开提供的导光板可以有助于提高导光板出光的均匀性，并且减少显示装置亮暗不均和交叉光束的现象。
在一些可选的实施方式中，所述设定区域范围为距离所述入光面 1.2毫米～2.8毫米的长度范围。
在一些可选的实施方式中，所述散光结构包括中空散光结构，所述中空散光结构朝向所述入光面的一面和/或所述中空散光结构背离所述入光面的一面中的至少一个设有多个第二散光单元。具体地，散光结构可以是中空散光结构而且，可以仅在中空散光结构朝向入光面的一面或背离入光面的一面设置第二散光单元，也可以在中空散光结构朝向入光面的一面和背离入光面的一面均设置第二散光单元。
在一些可选的实施方式中，沿远离所述入光面的方向，每个所述中空散光结构的深度为0.5毫米～0.6毫米。
在一些可选的实施方式中，所述中空散光结构包括沿多个光源的排列方向布置的单个中空散光结构，所述多个光源配置为提供入射到所述导光板的入光面上的光，并且所述单个中空散光结构沿所述多个光源的排列方向的长度大于或等于所述多个光源的总体排列长度。
可替换地，在一些可选的实施方式中，所述中空散光结构与所述多个光源的数目相同并且位置一一对应，所述多个光源配置为提供入射到所述导光板的入光面上的光。设置多个中空散光结构可以进一步提高导光板出光的均匀性。
在一些可选的实施方式中，设置在所述导光板的入光面上的所述多个第一散光单元沿弧线排列。可替换地，所述导光板的散光结构中的多个第二散光单元沿弧线排列。
在一些可选的实施方式中，每个所述第一散光单元均具有微结构，并且每个所述第一散光单元在垂直于所述导光板的入光面的平面上的投影包括圆弧形、等腰三角形、等腰梯形、曲线形中的至少一种。
在一些可选的实施方式中，当所述第一散光单元在垂直于所述导光板的入光面的平面上的投影包括圆弧形时，所述圆弧形的投影的半径为0.05毫米～0.06毫米之间。可替换地，当所述第一散光单元在垂直于所述导光板的入光面的平面上的投影包括曲线形时，所述曲线形的投影满足正弦曲线：y＝e·sin(f·φ)，其中e的取值为0.04毫米～0.06毫米，并且f的取值为1～4。可替换地，当所述第一散光单元在垂直于所述导光板的入光面的平面上的投影包括等腰梯形时，所述等腰梯形的投影的底角为30度～60度，并且高度为0.03毫米～0.05毫米。可替换地，当所述第一散光单元在垂直于所述导光板的入光面的平面上的 投影包括等腰三角形时，所述等腰三角形的散光单元的顶角为60度～70度，并且高度为0.03毫米～0.04毫米。
在一些可选的实施方式中，设置所述导光板的入光面上的所述多个第一散光单元的形状不同，并且所述散光结构中的所述多个第二散光单元的形状不同。通过不同形状的第一和第二散光单元的配合使用，可以进一步提高导光板出光的均匀性。
本公开还提供了一种背光模组，包括：光源，以及上述任一个导光板，其中所述多个光源配置为提供入射到所述导光板的入光面上的光。由于上述导光板的出光均匀性较高，故本公开提供的背光模组也具有较好的出光均匀性。
在一些可选的实施方式中，上述背光模组还包括：位于所述光源背离所述导光板的一侧上的背板，所述背板面向所述光源的一侧设有反射膜层。该反射膜层可以涂布在扩散片紧贴导光板的一面上，延长至光源并且完全覆盖入光面的上部。可替换地，该反射膜层也可以涂布在柔性电路板的延长段上，并且同样需完全覆盖入光面的上部。由此，避免光源发出的光在未进入画面显示区前出射而成为无效光。
在一些可选的实施方式中，每个所述光源均为LED灯。
本公开还提供了一种显示装置，包括：显示面板，以及上述任一个背光模组。由于上述背光模组具有较好的出光均匀性，故本公开提供的显示面板具有较好的显示效果。
附图说明
此处所说明的附图用来提供对本公开的进一步理解，并且构成本公开的一部分。本公开的示意性实施例及其说明用于解释本公开，并且不构成对本公开的不当限定。在附图中：
图1为本公开实施例提供的导光板的结构示意图；
图2为本公开实施例提供的另一导光板的结构示意图；
图3为本公开实施例提供的又一导光板的结构示意图；
图4为本公开实施例提供的再一导光板的结构示意图；
图5为本公开实施例提供的另外的导光板的结构示意图；
图6为本公开实施例提供的再另外的导光板的结构示意图；
图7为本公开实施例提供的多个第一散光单元沿弧线排列的结构 示意图；
图8为本公开实施例提供的多个第一散光单元沿直线排列的结构示意图；
图9为本公开提供的导光板的入光面上的第一散光单元的结构示意图；
图10为本公开提供的导光板的入光面上的另外的第一散光单元的结构示意图；
图11为本公开提供的导光板的入光面上的又另外的第一散光单元的结构示意图；
图12为本公开提供的导光板的入光面上的再另外的第一散光单元的结构示意图；
图13为本公开提供的导光板的入光面上的多个第一散光单元的结构示意图；
图14为现有技术中的导光板的散光效果图；以及
图15为本公开提供的导光板的散光效果图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。在附图中，1指代导光板，11指代入光面，2指代第一散光单元，3指代第二散光单元，4指代散光结构，并且5指代光源。
如图1、图2和图3所示，图1为本公开实施例提供的导光板的结构示意图；图2为本公开实施例提供的另一导光板的结构示意图；并且图3为本公开实施例提供的又一导光板的结构示意图；
本公开提供了一种导光板1。导光板1的入光面11设有多个第一散光单元2，并且在导光板1内的设定区域范围中沿远离入光面11的方向设有至少一散光结构4。
在本公开提供的导光板1中，通过在入光面11设置多个第一散光单元2以及至少一个散光结构4，使得光源5发出的光在经过导光板1后会更好地扩散，并且在进入显示面板前变得更加均匀。这样，本公开提供的导光板1可以有助于提高导光板1的出光均匀性，并且减少 显示装置亮暗不均和交叉光束的现象。
作为一种优选方案，所述设定区域范围为距离所述入光面111.2毫米～2.8毫米的长度范围。在这样的情况下，导光板的散光效果最为均匀。如图14和图15所示，图14为现有技术中的导光板的散光效果图；并且图15为本公开提供的导光板的散光效果图。比较图14和图15可知，本公开提供的导光板的散光效果更均匀一些。
在一种具体实施方式中，如图1、图2和图3所示，散光结构4包括中空散光结构。该中空散光结构朝向入光面11的一面和该中空散光结构背离入光面11的一面设有多个第二散光单元3。散光结构4可以是中空散光结构。另外，可以仅在中空散光结构朝向入光面11的一面或背离入光面11的一面设置第二散光单元3。可替换地，也可以在中空散光结构朝向入光面11的一面和背离入光面11的一面均设置第二散光单元3。
在一种可选的实施方式中，中空散光结构包括沿多个光源5的排列方向布置的单个中空散光结构，其中这样的多个光源5配置为提供入射到导光板1的入光面11上的光。而且，这样的单个中空散光结构沿多个光源5的排列方向的长度大于或等于多个光源5的总体排列长度。
在一种可选的实施方式中，如图3所示，中空散光结构与多个光源5的数目相同并且位置一一对应。同样地，这样的多个光源5配置为提供入射到导光板1的入光面11上的光。设置多个中空散光结构可以进一步提高导光板1的出光均匀性。
如图4、图5以及图6所示，图4为本公开实施例提供的再一导光板的结构示意图；图5为本公开实施例提供的再另外的导光板的结构示意图；并且图6为本公开实施例提供的又另外的导光板的结构示意图。具体地，导光板1的入光面上的多个第一散光单元2可以是连续的，也可以是间隔的。而且，多个第一散光单元可以沿着弧线排列，也可以沿着直线排列。
优选地，设置在导光板1的入光面11上的多个第一散光单元2沿弧线排列。进一步可替换地，导光板1的散光结构4中的多个第二散光单元3沿弧线排列。如图7和图8所示，图7为本公开实施例提供的多个第一散光单元沿弧线排列的结构示意图；并且图8为本公开实 施例提供的多个第一散光单元沿直线排列的结构示意图。假设入光角是α，折射角为β，折射光线相对于入射光线的偏转角为θ，同样还假设导光板的折射率为n，则由光的折射定律及附图可知：
sinα＝n×sinβ；              公式(1)
θ＝α-β；                  公式(2)
由以上可知：
θ＝α-arcsin(sinα/n)；             公式(3)
由三角函数的求导公式可得
Figure PCTCN2016097851-appb-000001
由此可见，θ是增函数，θ随着α的增大而增大，并且随着α的减小而减小。
也就是说，对于同一方向的入射光(LED光的主发射方向)来说，随着法线与水平面夹角的变小，α角增大，并且θ也增大。这样，出射光线被偏转的角度越大，并且散射单元的散光作用越强。由此可知，散光单元沿弧线排列的方式对光的散光作用好。
为了更好地提高导光板1的出光均匀性，经过试验可知，沿远离入光面11的方向，每个中空散光结构的深度优选为0.5毫米～0.6毫米。
上述每个第一散光单元2的具体形状可以有多种。如图9、图10、图11以及图12所示，图9为本公开提供的导光板的入光面上的第一散光单元的结构示意图；图10为本公开提供的导光板的入光面上的另外的第一散光单元的结构示意图；图11为本公开提供的导光板的入光面上的再另外的第一散光单元的结构示意图；并且图12为本公开提供的导光板的入光面上的又另外的第一散光单元的结构示意图；
每个第一散光单元2均具有微结构。而且，每个第一散光单元2在垂直于导光板1的入光面11的平面(例如，附图中所示的剖面)上的投影包括圆弧形、等腰三角形、等腰梯形、曲线形中的至少一种。
当第一散光单元2在垂直于导光板1的入光面11的平面上的投影包括圆弧形时，如图9所示，该圆弧形的投影的半径为0.05毫米～0.06毫米之间
可替换地，当散光单元2在垂直于导光板1的入光面11的平面上的投影包括曲线形时，如图10所示，该曲线形的投影满足正弦曲线：y＝e·sin(f·φ)，其中e的取值为0.04毫米～0.06毫米，并且f的取值为1～4。
可替换地，当散光单元2在垂直于导光板1的入光面11的平面上 的投影包括等腰梯形时，如图11所示，该等腰梯形的投影的底角c为30度～60度，并且高度h为0.03毫米～0.05毫米。
可替换地，当散光单元2在垂直于导光板1的入光面11的平面上的投影包括等腰三角形时，如图12所示，该等腰三角形的投影的顶角d为60度～70度，并且高度g为0.03毫米～0.04毫米。
采用上述一些参数的限定可以提高散光单元的散光效果。
参照图13，其为本公开提供的导光板的入光面上的多个第一散光单元的结构示意图。在一种具体的实施方式中，设置在导光板1的入光面11上的多个第一散光单元2的形状不同，并且散光结构4中的多个第二散光单元3的形状不同。通过不同形状的第一散光单元2和第二散光单元3的配合使用，可以进一步提高导光板1的出光均匀性。
本公开还提供了一种背光模组，包括：光源5，以及上述任一个导光板1。由于上述导光板1的出光均匀性较高，故本公开提供的背光模组也具有较好的出光均匀性。
进一步地，由于导光板1的入光面11上设有第一散射单元2，为了避免光源5发出的光在未进入画面显示区前出射而成为无效光，所以上述背光模组还包括：位于光源5背离导光板的一侧上的背板，并且该背板面向光源5的一侧设有反射膜层。该反射膜层可以涂布在扩散片紧贴导光板的一面，延长至中空散光结构并且完全覆盖入光面的上部。可替换地，该反射膜层也可以涂布在柔性电路板的延长段上，并且同样需完全覆盖入光面的上部。
在一种具体的实施方式中，每个光源5均为LED灯。
本公开还提供了一种显示装置，包括：显示面板，以及上述任一个背光模组。由于上述背光模组具有较好的出光均匀性，故本公开提供的显示面板具有较好的显示效果。
该显示装置可以是笔记本电脑显示屏、电子纸、液晶显示器、液晶电视、数码相框、手机、平板电脑等任何具有显示功能的产品或部件。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (18)

  1. 一种导光板，其中
    所述导光板的入光面设有多个第一散光单元，并且
    在所述导光板内的设定区域范围中沿远离所述入光面的方向设有至少一个散光结构。
  2. 根据权利要求1所述的导光板，其中
    所述设定区域范围为距离所述入光面1.2毫米～2.8毫米的长度范围。
  3. 根据权利要求1所述的导光板，其中
    所述散光结构包括中空散光结构，所述中空散光结构朝向所述入光面的一面和所述中空散光结构背离所述入光面的一面中的至少一个设有多个第二散光单元。
  4. 根据权利要求3所述的导光板，其中
    沿远离所述入光面的方向，每个所述中空散光结构的深度为0.5毫米～0.6毫米。
  5. 根据权利要求3所述的导光板，其中
    所述中空散光结构包括沿多个光源的排列方向布置的单个中空散光结构，所述多个光源配置为提供入射到所述导光板的入光面上的光，并且
    所述单个中空散光结构沿所述多个光源的排列方向的长度大于或等于所述多个光源的总体排列长度。
  6. 根据权利要求3所述的导光板，其中
    所述中空散光结构与多个光源的数目相同并且位置一一对应，所述多个光源配置为提供入射到所述导光板的入光面上的光。
  7. 根据权利要求3～6中任一项所述的导光板，其中
    设置在所述导光板的入光面上的所述多个第一散光单元沿弧线排列。
  8. 根据权利要求3～6中任一项所述的导光板，其中
    所述导光板的散光结构中的所述多个第二散光单元沿弧线排列。
  9. 根据权利要求7或8所述的导光板，其中
    每个所述第一散光单元均具有微结构，并且
    每个所述第一散光单元在垂直于所述导光板的入光面的平面上的投影包括圆弧形、等腰三角形、等腰梯形、曲线形中的至少一种。
  10. 根据权利要求9所述的导光板，其中
    当所述第一散光单元在垂直于所述导光板的入光面的平面上的投影包括圆弧形时，所述圆弧形的投影的半径为0.05毫米～0.06毫米之间。
  11. 根据权利要求9所述的导光板，其中
    当所述第一散光单元在垂直于所述导光板的入光面的平面上的投影包括曲线形时，所述曲线形的投影满足正弦曲线：y＝e·sin(f·φ)，其中e的取值为0.04毫米～0.06毫米，并且f的取值为1～4。
  12. 根据权利要求9所述的导光板，其中
    当所述第一散光单元在垂直于所述导光板的入光面的平面上的投影包括等腰梯形时，所述等腰梯形的投影的底角为30度～60度，并且高度为0.03毫米～0.05毫米。
  13. 根据权利要求9所述的导光板，其中
    当所述第一散光单元在垂直于所述导光板的入光面的平面上的投影包括等腰三角形时，所述等腰三角形的投影的顶角为60度～70度，并且高度为0.03毫米～0.04毫米。
  14. 根据权利要求9所述的导光板，其中
    设置在所述导光板的入光面上的所述多个第一散光单元的形状不同，并且
    所述散光结构中的所述多个第二散光单元的形状不同。
  15. 一种背光模组，包括：
    多个光源，以及
    如权利要求1～14中任一项所述的导光板，
    其中，所述多个光源配置为提供入射到所述导光板的入光面上的光。
  16. 根据权利要求15所述的背光模组，还包括：
    位于所述光源背离所述导光板的一侧上的背板，所述背板面向所述光源的一侧设有反射膜层。
  17. 根据权利要求15或16所述的背光模组，其中
    每个所述光源均为LED灯。
  18. 一种显示装置，包括：
    显示面板，以及
    如权利要求15～17中任一项所述的背光模组。
PCT/CN2016/097851 2016-01-05 2016-09-02 导光板、背光模组及显示装置 WO2017118064A1 (zh)

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