WO2018001006A1 - 背光模组及其操作方法和显示装置 - Google Patents

背光模组及其操作方法和显示装置 Download PDF

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Publication number
WO2018001006A1
WO2018001006A1 PCT/CN2017/085692 CN2017085692W WO2018001006A1 WO 2018001006 A1 WO2018001006 A1 WO 2018001006A1 CN 2017085692 W CN2017085692 W CN 2017085692W WO 2018001006 A1 WO2018001006 A1 WO 2018001006A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
backlight module
light shielding
light guide
Prior art date
Application number
PCT/CN2017/085692
Other languages
English (en)
French (fr)
Inventor
王鑫
杜建华
Original Assignee
京东方科技集团股份有限公司
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Publication date
Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/737,532 priority Critical patent/US10288232B2/en
Publication of WO2018001006A1 publication Critical patent/WO2018001006A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • 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
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • 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
    • G02B6/0033—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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/30—Collimators
    • 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
    • G02B5/0215—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 the surface having a regular structure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/201—Filters in the form of arrays
    • 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
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a backlight module, an operating method thereof, and a display device including the backlight module.
  • Portable electronic products with display devices are widely used. For example, people can read, learn, or exchange information through their own mobile phones or tablets during transportation. However, the content displayed on your own mobile phone or tablet computer will be peeked by people nearby, resulting in information such as personal privacy being leaked out, causing inconvenience to the user.
  • the displayed information is protected from being leaked by attaching a privacy sheet on the upper surface of the display device.
  • the way to prevent information leakage by attaching a privacy film is not very flexible.
  • the privacy film needs to be removed, and the next time the information leakage needs to be prevented, the privacy film needs to be reattached.
  • the present invention aims to at least solve the above-mentioned technical problems existing in the prior art, and proposes a backlight module, an operating method thereof and a display device including the same.
  • a backlight module including a light guide plate, a collimated light source, and a light shielding plate between the light guide plate and the collimated light source.
  • the light guide plate includes a transparent body and a plurality of diffusion mesh points formed on the transparent body.
  • the visor includes a plurality of opaque regions corresponding to the plurality of diffusing dots of the light guide plate.
  • the collimated light source generates collimated light that is incident perpendicular to the visor.
  • the backlight module may further include a driving unit connected to at least one of the light shielding plate and the light guide plate for driving the light shielding plate and the light guide plate to One less movement is performed to cause relative displacement of the visor and the light guide plate in the plane of the backlight module.
  • a light shielding plate may include: a transparent substrate; and a plurality of light shielding patterns on the transparent substrate that form the plurality of light shielding regions.
  • the material of the light shielding pattern may be a metal material.
  • the material of the transparent substrate may be glass.
  • the light guide plate may include a collimated light exiting region between adjacent diffusion mesh points, and the size of the collimated light exiting region may be equal to the size of the light shielding region of the light shielding plate.
  • the collimated light source may include at least one of a laser and an LED lamp having a collimating lens.
  • the material of the transparent body of the light guide plate may be one of the following: polycarbonate, polymethyl methacrylate or glass.
  • a display device comprising a backlight module according to the present invention.
  • a method of operating a backlight module including a light guide plate, a collimated light source, and a light shielding plate between the light guide plate and the collimated light source, the light guide plate including a transparent body And a plurality of diffusion meshes formed on the transparent body, the light shielding plate includes a plurality of light shielding regions corresponding to the plurality of diffusion mesh points of the light guide plate, and the collimated light source generates collimated light rays that are vertically irradiated to the light shielding plate.
  • the method includes: in a privacy display mode, aligning a light shielding area of the light shielding plate with a diffusion mesh point of the light guide plate in a direction perpendicular to a plane of the backlight module; and in a normal display mode, making the light shielding plate
  • the light-shielding region and the diffusion mesh of the light guide plate are staggered in a direction perpendicular to a plane of the backlight module.
  • the backlight module may further include a driving unit connected to at least one of the light shielding plate and the light guide plate.
  • the method may include: driving, in the anti-spy display mode, at least one of the light shielding plate and the light guide plate by the driving unit to move, the light shielding area of the light shielding plate and the diffusion mesh point of the light guide plate being perpendicular to the backlight module Aligning in a plane direction; and in the normal display mode, driving at least one of the light shielding plate and the light guide plate by the driving unit to move, so that the light shielding area of the light shielding plate and the diffusion mesh point of the light guide plate are perpendicular to the backlight module
  • the direction of the plane is staggered.
  • the user can adjust the relative position of the light shielding plate and the light guide plate according to actual needs, so that the light shielding area of the light shielding plate is aligned or staggered with the diffusion mesh point of the light guide plate to realize the anti-spy display mode and the common display respectively.
  • the mode in turn, facilitates switching between the anti-spy display mode and the normal display mode.
  • FIG. 1 is a view schematically showing the structure of a backlight module according to an embodiment of the present invention
  • Figure 2 is a plan view of the visor of Figure 1;
  • 3A is a schematic structural view of the backlight module of FIG. 1 in a peep prevention display mode
  • 3B is a schematic structural view of the backlight module of FIG. 1 in a normal display mode
  • FIG. 4 is a view schematically showing the structure of a display device according to an embodiment of the present invention.
  • FIG. 5 is a flow chart of a method of operating a backlight module according to an embodiment of the invention.
  • FIG. 1 is a view schematically showing the structure of a backlight module according to an embodiment of the present invention
  • FIG. 2 is a plan view of the light shielding plate of FIG. 1.
  • a backlight module may include a light guide plate 1, a light shielding plate 2, and a collimated light source 3.
  • the visor 2 is located between the light guide plate 1 and the collimated light source 3.
  • the light guide plate 1 may include a transparent body 11 and a plurality of diffusion dots 12 formed on the transparent body 11.
  • the visor 2 includes a plurality of light shielding regions 5 corresponding to the plurality of diffusion dots 12 of the light guide plate 1.
  • the collimated light source 3 generates collimated rays that are vertically irradiated to the visor 2.
  • the light-transmitting region 4 can be formed in a region other than the light-shielding region 5 of the light-shielding plate 2, so that the collimated light generated by the collimated light source 3 can be vertically irradiated to the light guide plate 1 through the light-transmitting region 4. .
  • the collimated light source 3 may include various light sources such as a laser and an LED lamp having a collimating lens capable of generating collimated light.
  • the user can adjust the relative position of the light shielding plate 2 and the light guide plate 1 according to actual needs, so that the light shielding region 5 of the light shielding plate 2 is aligned or staggered with the diffusion mesh point 12 of the light guide plate 1 to realize respectively.
  • the anti-spy display mode and the normal display mode are conveniently switched between the anti-spy display mode and the normal display mode.
  • 3A is a schematic structural view of the backlight module of FIG. 1 in a peep prevention display mode.
  • the user can adjust the position of the visor 2 and/or the light guide plate 1 in the plane of the backlight module (the plane perpendicular to the collimated light), so that the visor 2 is shielded from light.
  • the region 5 is aligned with the diffusion dots 12 of the light guide plate 1.
  • the collimated light rays that are vertically irradiated to the light shielding plate 2 generated by the collimated light source 3 are blocked by the light shielding region 5 of the light shielding plate 2, and thus no light is irradiated to the diffusion mesh dots 12 of the light guiding plate 1.
  • collimated rays passing through the light-transmitting region 4 of the visor 2 are vertically irradiated to the light guide plate 1, and are vertically emitted outward through a region located between the diffusion dots 12. Therefore, the region of the light guide plate 1 between the diffusion dots 12 can be referred to as a collimated light exit region.
  • the user can only view the displayed content in a direction perpendicular to the plane of the backlight module, thereby achieving the effect of the anti-spy display.
  • FIG. 3B is a schematic structural view of the backlight module of FIG. 1 in a normal display mode.
  • the user can adjust the position of the visor 2 and/or the light guide plate 1 in the plane of the backlight module, so that the light shielding region 5 of the visor 2 and the diffusion mesh point 12 of the light guide plate 1 Staggered.
  • the collimated light generated by the collimated light source 3 and irradiated to the visor 2 vertically is irradiated to the diffusion dots 12 through the light-transmitting region 4 of the visor 2 .
  • the collimated light generated by the collimated light source 3 is diffused, so that the backlight module constitutes a surface light source.
  • the user can view the displayed content from multiple directions.
  • the material of the transparent body 11 of the light guide plate 1 may be one of polycarbonate, polymethyl methacrylate or glass. Can be printed, chemically etched A diffusion dot 12 is formed on the transparent body 11 by a method such as a V-cut method, a Stamper method, or an internal diffusion method.
  • the light shielding plate 2 may include a transparent substrate 21 and a light shielding pattern 22 on the transparent substrate 21 forming the light shielding region 5.
  • a region of the transparent substrate 21 where the light-shielding pattern 22 is not formed may form the light-transmitting region 4.
  • the light shielding pattern 22 can be formed on the transparent substrate 21 by printing, mask patterning, or the like.
  • the material of the transparent substrate 21 may be glass
  • the material of the light shielding pattern 22 may be a metal material
  • the light shielding pattern 22 may be formed by a mask patterning process.
  • the light shielding pattern 22 shown in the drawing is located on the side of the transparent substrate 21 facing the light guide plate 1, but the present invention is not limited thereto. According to an embodiment of the present invention, the light shielding pattern 22 may be located on a side of the transparent substrate 21 facing away from the light guide plate 1, or within the transparent substrate 21. According to an embodiment of the present invention, the light shielding pattern 22 may be located on both sides of the transparent substrate 21 (ie, a side facing the light guide plate 1 and a side facing away from the light guide plate 1), thereby being formed on one side of the transparent substrate 21. The density of the shading pattern on the top to reduce process costs. Further, the light shielding pattern 22 shown in the drawing is formed in a rectangular shape, but the present invention is not limited thereto.
  • the backlight module may further include a driving unit 6.
  • the driving unit 6 may be connected to at least one of the visor 2 and the light guide plate 1 to drive the visor 2 and/or the light guide plate 1 to move, so that the visor 2 and the light guide plate 1 are opposite in the plane of the backlight module.
  • the displacement is implemented to realize the anti-spy display mode and the normal display mode of the backlight module, and can be conveniently switched between the two modes.
  • the drive unit 6 is connected to the light shielding plate 2
  • the present invention is not limited thereto.
  • the driving unit 6 may be connected to the light guide plate 1, or the driving unit 6 may be connected to both the light shielding plate 2 and the light guide plate 1.
  • the size of the light-shielding region 5 of the light shielding plate 2 can be set to be equal to the size of the collimated light exiting region of the light guide plate 1, and the display device is guaranteed to be common. Display effect in display mode.
  • the light shielding region 5 When the light shielding region 5 is offset from the diffusion mesh point 12, the light shielding region 5 partially blocks the collimated light exiting region between the diffusion dots 12. Setting the size of the light-shielding region 5 to be equal to the size of the collimated light exiting region allows as much light as possible to be diffused by the diffusion dots 12, thereby ensuring the display effect in the normal display mode. For example, referring to FIG.
  • the size of the light-shielding region 5 in the horizontal direction may be set to collimation.
  • the light exiting regions are equal in size in the horizontal direction, and when the light blocking regions 5 are staggered from the diffusing dots 12 by the movement in the vertical direction, the size of the light blocking regions 5 in the vertical direction may be set to be vertical with the collimated light exiting regions.
  • the sizes of the directions are equal, and when the light-shielding region 5 and the diffusion mesh point 12 are shifted by both the movement in the horizontal direction and the movement in the vertical direction, the sizes of the light-shielding region 5 in the horizontal direction and the vertical direction can be respectively set to collimation
  • the light exiting regions are equal in size in the horizontal direction and the vertical direction.
  • FIG. 4 schematically shows the structure of a display device according to an embodiment of the present invention.
  • a display device may include a display panel 7 and a backlight module shown in FIG. 1.
  • FIG. 5 is a flow chart of a method of operating a backlight module according to an embodiment of the invention.
  • a method for operating a backlight module may include:
  • the light shielding area of the light shielding plate is aligned with the diffusion mesh point of the light guide plate in a direction perpendicular to the plane of the backlight module (S1);
  • the light shielding area of the light shielding plate and the diffusion mesh point of the light guide plate are shifted in a direction perpendicular to the plane of the backlight module (S2).
  • the collimated light generated by the collimated light source 3 is vertically irradiated to the visor 2, and sequentially passes through the light-transmitting region 4 of the visor 2 and the collimated light of the light guide plate 1. Exit area.
  • the collimated light generated by the collimated light source 3 is vertically irradiated to the light shielding plate 2, and is irradiated to the diffusion mesh point 12 through the light transmitting region 4.
  • the light guide plate and/or the light shielding plate may be relatively displaced in the plane of the backlight module by the driving unit. That is, in the anti-spy display mode, at least one of the light shielding plate and the light guide plate is driven by the driving unit to move, so that the light shielding region of the light shielding plate and the diffusion mesh point of the light guide plate are aligned in a direction perpendicular to a plane of the backlight module; And in the normal display mode, the driving unit drives at least one of the light shielding plate and the light guide plate to move, so that the light shielding area of the light shielding plate and the diffusion mesh point of the light guide plate are staggered in a direction perpendicular to a plane of the backlight module.

Abstract

一种背光模组及其操作方法和包括背光模组的显示装置。背光模组包括导光板（1）、准直光源（3）和位于导光板（1）和准直光源（3）之间的遮光板（2）。导光板（1）包括透明主体（11）和形成于透明主体上的多个扩散网点（12）。遮光板（2）包括与导光板（1）的多个扩散网点（12）对应的多个遮光区域（5）和透光区域（4）。准直光源（3）生成垂直照射遮光板（2）的准直光线。驱动遮光板（2）和/或导光板（1）运动，以使遮光区域（5）与对应的扩散网点（12）正对或错位，以实现防窥或普通显示功能。

Description

背光模组及其操作方法和显示装置 技术领域
本发明涉及显示技术领域，特别涉及一种背光模组及其操作方法和包括背光模组的显示装置。
背景技术
具有显示装置的便携式电子产品以得到广泛应用，例如，人们在乘坐交通工具的过程中，可以通过自己的手机或平板电脑等进行阅读、学习或信息交流。但是，自己的手机或平板电脑等上显示的内容会被附近的人窥视到，导致例如个人隐私等信息被泄露出去，给用户带来不便。
在现有技术中，通过在显示装置的上表面上附接防窥片来保护显示的信息不被泄露。但是通过附接防窥片来防止信息泄露的方式灵活性不高。当不存在信息泄露的风险并且用户希望以正常的模式来观看显示装置时，需要将防窥片揭下来，而在下一次需要防止信息泄露时，需要重新附接防窥片。
发明内容
如何提供一种能够在正常显示模式和防窥模式之间方便地进行切换的方式，是本领域亟需解决的技术问题。
本发明旨在至少解决现有技术中存在的上述技术问题，并且提出了一种背光模组及其操作方法和包括该背光模组的显示装置。
根据本发明的一个方面，提供了一种背光模组，包括导光板、准直光源和位于导光板和准直光源之间的遮光板。导光板包括透明主体和形成于透明主体上的多个扩散网点。遮光板包括与导光板的多个扩散网点对应的多个遮光区域。准直光源生成垂直照射至遮光板的准直光线。
根据本发明的实施例，所述背光模组还可以包括连接至遮光板和导光板中的至少一个的驱动单元，用于驱动遮光板和导光板中的至 少一个进行运动，以使得遮光板与导光板在所述背光模组的平面内产生相对位移。
根据本发明的实施例，遮光板可以包括：透明衬底；和透明衬底上的形成所述多个遮光区域的多个遮光图形。
根据本发明的实施例，遮光图形的材料可以为金属材料。
根据本发明的实施例，透明衬底的材料可以为玻璃。
根据本发明的实施例，导光板可以包括在相邻的扩散网点之间的准直光出射区域，并且准直光出射区域的尺寸可以与遮光板的遮光区域的尺寸相等。
根据本发明的实施例，准直光源可以包括激光器和具有准直透镜的LED灯中的至少之一。
根据本发明的实施例，导光板的透明主体的材料可以为下列之一：聚碳酸酯、聚甲基丙烯酸甲酯或玻璃。
根据本发明的另一方面，提供了一种显示装置，包括根据本发明的背光模组。
根据本发明的另一方面，提供了一种操作背光模组的方法，所述背光模组包括导光板、准直光源和位于导光板和准直光源之间的遮光板，导光板包括透明主体和形成于透明主体上的多个扩散网点，遮光板包括与导光板的多个扩散网点对应的多个遮光区域，并且准直光源生成垂直照射至遮光板的准直光线。所述方法包括：在防窥显示模式下，使遮光板的遮光区域与导光板的扩散网点在垂直于所述背光模组的平面的方向上对齐；以及在普通显示模式下，使遮光板的遮光区域与导光板的扩散网点在垂直于所述背光模组的平面的方向上错开。
根据本发明的实施例，所述背光模组还可以包括连接至遮光板和导光板中的至少一个的驱动单元。所述方法可以包括：在防窥显示模式下，通过驱动单元驱动遮光板和导光板中的至少一个进行运动，使遮光板的遮光区域与导光板的扩散网点在垂直于所述背光模组的平面的方向上对齐；以及在普通显示模式下，通过驱动单元驱动遮光板和导光板中的至少一个进行运动，使遮光板的遮光区域与导光板的扩散网点在垂直于所述背光模组的平面的方向上错开。
根据本发明的技术方案，用户可根据实际需要来调整遮光板与导光板的相对位置，以使得遮光板的遮光区域与导光板的扩散网点对齐或错开，以分别实现防窥显示模式和普通显示模式，进而方便地在防窥显示模式和普通显示模式之间进行切换。
附图说明
附图是用来提供对本发明的进一步理解，并且构成说明书的一部分，与下面的具体实施方式一起用于解释本发明，但并不构成对本发明的限制。在附图中：
图1示意地示出了根据本发明实施例的背光模组的结构；
图2为图1中的遮光板的平面图；
图3A为图1的背光模组在防窥显示模式下的结构示意图；
图3B为图1的背光模组在普通显示模式下的结构示意图；
图4示意地示出了根据本发明实施例的显示装置的结构；以及
图5为根据本发明实施例的操作背光模组的方法的流程图。
具体实施方式
为使本领域的技术人员更好地理解本发明的技术方案，下面结合附图对根据本发明各实施例的背光模组及其操作方法和包括该背光模组的显示装置进行详细描述。
图1示意地示出了根据本发明实施例的背光模组的结构，并且图2为图1中的遮光板的平面图。
参见图1，根据本发明实施例的背光模组可以包括导光板1、遮光板2和准直光源3。遮光板2位于导光板1和准直光源3之间。导光板1可以包括透明主体11和形成于透明主体11上的多个扩散网点12。遮光板2包括与导光板1的多个扩散网点12对应的多个遮光区域5。准直光源3生成垂直照射至遮光板2的准直光线。
如图2所示，在遮光板2的除去遮光区域5之外的区域中可形成透光区域4，使得准直光源3生成的准直光线能够穿过透光区域4垂直照射至导光板1。
根据本发明的实施例，准直光源3可以包括激光器和具有准直透镜的LED灯等能够产生准直光线的各种光源。
根据本发明的背光模组，用户可根据实际需要来调整遮光板2与导光板1的相对位置，以使得遮光板2的遮光区域5与导光板1的扩散网点12对齐或错开，以分别实现防窥显示模式和普通显示模式，进而方便地在防窥显示模式和普通显示模式之间进行切换。
为使得本领域技术人员更好的理解本发明，下面将对本实施例提供的背光模组在防窥显示模式和普通显示模式下的具体操作过程进行详细的描述。
图3A为图1的背光模组在防窥显示模式下的结构示意图。
参见图3A，在防窥显示模式下，用户可对遮光板2和/或导光板1在背光模组的平面(垂直于准直光线的平面)内的位置进行调整，使得遮光板2的遮光区域5与导光板1的扩散网点12对齐。此时，准直光源3生成的垂直照射至遮光板2的准直光线被遮光板2的遮光区域5遮挡，因而没有光线照射至导光板1的扩散网点12。此外，穿过遮光板2的透光区域4的准直光线垂直照射至导光板1，并且穿过位于扩散网点12之间的区域垂直向外发射。因此，可以将导光板1的位于扩散网点12之间的区域称作准直光出射区域。此时，用户仅能在垂直于背光模组的平面的方向上观看到显示的内容，从而达到防窥显示的效果。
图3B为图1的背光模组在普通显示模式下的结构示意图。
参见图3B，在普通显示模式下，用户可对遮光板2和/或导光板1在背光模组的平面内的位置进行调整，使得遮光板2的遮光区域5与导光板1的扩散网点12错开。此时，准直光源3生成的垂直照射至遮光板2的准直光线穿过遮光板2的透光区域4照射至扩散网点12。在扩散网点12的扩散作用下，准直光源3生成的准直光线被扩散，从而使得背光模组构成面光源。此时，用户可以从多个方向上观看到显示的内容。
根据本发明的实施例，导光板1的透明主体11的材料可以为聚碳酸酯、聚甲基丙烯酸甲酯或玻璃之一。可以通过印刷法、化学蚀刻 法、精密机械刻画(V-cut)法、光微影(Stamper)法、内部扩散法等方法在透明主体11上形成扩散网点12。
参见图1、图2、图3A和图3B，遮光板2可以包括透明衬底21和透明衬底21上的形成遮光区域5的遮光图形22。透明衬底21的未形成遮光图形22的区域可形成透光区域4。可通过打印、掩模构图等方法在透明衬底21上形成遮光图形22。
根据本发明的实施例，透明衬底21的材料可以为玻璃，遮光图形22的材料可以为金属材料，并且可以通过掩模构图工艺形成遮光图形22。
需要说明的是，图中示出的遮光图形22位于透明衬底21朝向导光板1的一侧，但本发明不限于此。根据本发明的实施例，遮光图形22可位于透明衬底21背离导光板1的一侧，或位于透明衬底21内。根据本发明的实施例，遮光图形22可位于透明衬底21的两侧(即，朝向导光板1的一侧和背离导光板1的一侧)，从而降低形成在透明衬底21的单侧上的遮光图案的密度，以降低工艺成本。此外，图中示出的遮光图形22形成为矩形形状，但本发明不限于此。本领域技术人员应当认识到的是，能够满足当遮光图形22与对应的扩散网点12对齐时，能够完全遮挡扩散网点12不被准直光源3生成的准直光线照射到的遮光图形22的形状都是可以应用于本发明的。
根据本发明的实施例，背光模组还可以包括驱动单元6。驱动单元6可以与遮光板2和导光板1中的至少一者连接，以驱动遮光板2和/或导光板1进行运动，使得遮光板2与导光板1在背光模组的平面内产生相对位移，以实现背光模组的防窥显示模式和普通显示模式，并且可以方便地在两种模式之间进行切换。
需要说明的是，图中仅示例性地示出了驱动单元6与遮光板2连接的情况，但本发明不限于此。根据本发明的实施例，驱动单元6可以与导光板1连接，或者驱动单元6可以与遮光板2和导光板1两者连接。
根据本发明的实施例，可以将遮光板2的遮光区域5的尺寸设置为与导光板1的准直光出射区域的尺寸相等，保证显示装置在普通 显示模式下的显示效果。当遮光区域5与扩散网点12错开后，遮光区域5会部分地遮挡扩散网点12之间的准直光出射区域。将遮光区域5的尺寸与准直光出射区域的尺寸设置为相等，可以使得尽量多的光线被扩散网点12扩散，从而确保在普通显示模式下的显示效果。例如，参见图2，当通过水平方向的移动使得遮光区域5(即，图2所示的遮光图形22)与扩散网点12错开时，可以将遮光区域5在水平方向的尺寸设置为与准直光出射区域在水平方向的尺寸相等，当通过竖直方向的移动使得遮光区域5与扩散网点12错开时，可以将遮光区域5在竖直方向的尺寸设置为与准直光出射区域在竖直方向的尺寸相等，当通过水平方向的移动和竖直方向的移动两者使得遮光区域5与扩散网点12错开时，可以将遮光区域5在水平方向和竖直方向的尺寸分别设置为与准直光出射区域在水平方向和竖直方向的尺寸相等。
图4示意地示出了根据本发明实施例的显示装置的结构。
参见图4，根据本发明实施例的显示装置可以包括显示面板7和图1所示的背光模组。
图5为根据本发明实施例的操作背光模组的方法的流程图。
如图5所示，根据本发明实施例的操作背光模组的方法可以包括：
在防窥显示模式下，使遮光板的遮光区域与导光板的扩散网点在垂直于背光模组的平面的方向上对齐(S1)；以及
在普通显示模式下，使遮光板的遮光区域与导光板的扩散网点在垂直于背光模组的平面的方向上错开(S2)。
参见图3A和图5，在防窥显示模式下，准直光源3生成的准直光线垂直照射至遮光板2，并依次穿过遮光板2的透光区域4和导光板1的准直光出射区域。参见图3B和图5，在普通显示模式下，准直光源3生成的准直光线垂直照射至遮光板2，并穿过透光区域4照射至扩散网点12。
根据本发明的实施例，当背光模组包括驱动单元时，可以通过驱动单元使导光板和/或遮光板在背光模组的平面内产生相对位移， 即，在防窥显示模式下，通过驱动单元驱动遮光板和导光板中的至少一个进行运动，使遮光板的遮光区域与导光板的扩散网点在垂直于背光模组的平面的方向上对齐；以及在普通显示模式下，通过驱动单元驱动遮光板和导光板中的至少一个进行运动，使遮光板的遮光区域与导光板的扩散网点在垂直于背光模组的平面的方向上错开。
可以理解的是，以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式，然而本发明并不局限于此。对于本领域内的普通技术人员而言，在不脱离本发明的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本发明的保护范围。

Claims (12)

  1. 一种背光模组，包括导光板、准直光源和位于导光板和准直光源之间的遮光板，其中
    导光板包括透明主体和形成于透明主体上的多个扩散网点，
    遮光板包括与导光板的多个扩散网点对应的多个遮光区域，并且
    准直光源生成垂直照射至遮光板的准直光线。
  2. 根据权利要求1所述的背光模组，还包括连接至遮光板和导光板中的至少一个的驱动单元，用于驱动遮光板和导光板中的至少一个进行运动，以使得遮光板与导光板在所述背光模组的平面内产生相对位移。
  3. 根据权利要求1或2所述的背光模组，其中，遮光板包括：
    透明衬底；和
    透明衬底上的形成所述多个遮光区域的多个遮光图形。
  4. 根据权利要求3所述的背光模组，其中，遮光图形的材料为金属材料。
  5. 根据权利要求3所述的背光模组，其中，透明衬底的材料为玻璃。
  6. 根据权利要求1或2所述的背光模组，其中，导光板包括在相邻的扩散网点之间的准直光出射区域，并且
    其中，准直光出射区域的尺寸与遮光板的遮光区域的尺寸相等。
  7. 根据权利要求1或2所述的背光模组，其中，准直光源包括激光器。
  8. 根据权利要求1或2所述的背光模组，其中，准直光源包括具有准直透镜的LED灯。
  9. 根据权利要求1或2所述的背光模组，其中，导光板的透明主体的材料为下列之一：聚碳酸酯、聚甲基丙烯酸甲酯或玻璃。
  10. 一种显示装置，包括根据权利要求1-9中任一项所述的背光模组。
  11. 一种操作背光模组的方法，所述背光模组包括导光板、准直光源和位于导光板和准直光源之间的遮光板，导光板包括透明主体和形成于透明主体上的多个扩散网点，遮光板包括与导光板的多个扩散网点对应的多个遮光区域，并且准直光源生成垂直照射至遮光板的准直光线，所述方法包括：
    在防窥显示模式下，使遮光板的遮光区域与导光板的扩散网点在垂直于所述背光模组的平面的方向上对齐；以及
    在普通显示模式下，使遮光板的遮光区域与导光板的扩散网点在垂直于所述背光模组的平面的方向上错开。
  12. 根据权利要求11所述的操作背光模组的方法，其中，所述背光模组还包括连接至遮光板和导光板中的至少一个的驱动单元，所述方法包括：
    在防窥显示模式下，通过驱动单元驱动遮光板和导光板中的至少一个进行运动，使遮光板的遮光区域与导光板的扩散网点在垂直于所述背光模组的平面的方向上对齐；以及
    在普通显示模式下，通过驱动单元驱动遮光板和导光板中的至少一个进行运动，使遮光板的遮光区域与导光板的扩散网点在垂直于所述背光模组的平面的方向上错开。
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JP2011028019A (ja) * 2009-07-27 2011-02-10 Hitachi Displays Ltd 液晶表示装置
CN103591514A (zh) * 2013-11-22 2014-02-19 京东方科技集团股份有限公司 一种背光模组及液晶显示装置
CN203551920U (zh) * 2013-11-22 2014-04-16 京东方科技集团股份有限公司 一种显示装置
CN105911636A (zh) * 2016-06-30 2016-08-31 京东方科技集团股份有限公司 背光模组及其工作方法和显示装置
CN205749977U (zh) * 2016-06-30 2016-11-30 京东方科技集团股份有限公司 背光模组和显示装置

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