WO2020093892A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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Publication number
WO2020093892A1
WO2020093892A1 PCT/CN2019/113596 CN2019113596W WO2020093892A1 WO 2020093892 A1 WO2020093892 A1 WO 2020093892A1 CN 2019113596 W CN2019113596 W CN 2019113596W WO 2020093892 A1 WO2020093892 A1 WO 2020093892A1
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WO
WIPO (PCT)
Prior art keywords
light
light guide
backlight module
guide plate
emitting element
Prior art date
Application number
PCT/CN2019/113596
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English (en)
French (fr)
Inventor
徐飙
Original Assignee
维沃移动通信有限公司
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Publication of WO2020093892A1 publication Critical patent/WO2020093892A1/zh

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    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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
    • 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

Definitions

  • the present disclosure relates to the field of electronic technology, in particular to a backlight module and a display device.
  • FIG. 1 it is a schematic structural diagram of a related art display device.
  • 1.1 is the upper black border area
  • 1.2 is the left black border area
  • 1.3 is the right black border area
  • 1.4 is the display area
  • 1.5 is the lower black border area.
  • the structure of the display screen has been very difficult to reduce the width of the lower black border area 1.5.
  • a core reason for limiting the size of the lower black border area is that the point light source needs a mixing distance to be converted into a surface light source through the light guide plate.
  • the light from the point light source exits toward the light guide plate at a certain exit angle.
  • the two point light sources There will be a dark area without light, and the distance between the point light source and the apex of the dark area is the light mixing distance.
  • after light enters through the light incident surface of the light guide plate in order to avoid excessive light propagation loss and excessive light propagation loss and a bright edge on the lower edge of the display area 1.4, it is difficult to reduce the light mixing distance.
  • the present disclosure provides a backlight module and a display device to solve the problem that it is difficult to reduce the lower black border area of the display device in the related art.
  • some embodiments of the present disclosure provide a backlight module, including:
  • a light guide plate, the reflection surface of the light guide plate near the light emitting element is provided with a plurality of light guide groove areas, each light guide groove area includes a plurality of light guide grooves, each light guide groove orthographic projection on the reflection surface is Curved, and the curved direction of the arc is toward the light emitting element;
  • the light emitted from the light emitting element toward the light incident surface of the light guide plate is reflected to the light exit surface of the light guide plate through the light guide groove.
  • some embodiments of the present disclosure provide a display device including the above-mentioned backlight module.
  • a plurality of light guide groove regions are provided on the side of the light guide plate close to the light emitting element, each light guide groove region includes a plurality of light guide grooves, and each light guide groove is on the reflection surface
  • the orthographic projection on the arc is curved toward the light-emitting element, which can increase the angle of light emitted by the light-emitting element after entering the light guide plate, reduce the dark area of the light-emitting element and the light mixing distance, thereby reducing the blackness of the backlight module
  • the size of the side thereby reducing the size of the lower black border of the entire display device, to achieve the design of the lower narrow side of the display device, and on the basis of ensuring that all light enters the light guide plate, it can help reduce the thickness of the light guide plate and achieve thinner and lighter.
  • FIG. 1 shows a schematic structural diagram of a related art display device
  • FIG. 2 shows one of the structural schematic diagrams of the backlight module provided by some embodiments of the present disclosure
  • FIG. 3 shows a second structural schematic diagram of a backlight module provided by some embodiments of the present disclosure
  • FIG. 4 shows a third structural schematic diagram of a backlight module provided by some embodiments of the present disclosure.
  • FIG. 5 shows a fourth structural schematic diagram of a backlight module provided by some embodiments of the present disclosure.
  • FIG. 2 shows one of the structural schematic diagrams of the backlight module provided by some embodiments of the present disclosure
  • FIG. 3 shows the second structural schematic diagram of the backlight module provided by some embodiments of the present disclosure
  • FIG. 4 shows FIG. 3 is a schematic structural diagram of a backlight module provided by some embodiments of the present disclosure.
  • a backlight module which may include:
  • each light guide groove area 123 includes a plurality of light guide grooves 1231, and each light guide groove 1231
  • the orthographic projection on the reflective surface 122 is arc-shaped, and the curved direction of the arc is toward the light-emitting element 11;
  • the light emitted from the light emitting element 11 toward the light incident surface 121 of the light guide plate 12 is reflected by the light guide groove 1231 to the light exit surface 124 of the light guide plate 12.
  • the light guide plate 12 includes a light entrance surface 121, a reflection surface 122, and a light exit surface 124.
  • the light entrance surface 121 is used to receive light emitted from the light emitting element 11 and guide the light into the light guide plate 12, the reflection surface 122 It is used to reflect a part of the light introduced into the light guide plate 12 from the light incident surface 121 so that the part of the light is emitted from the light exit surface 124. As shown in FIG.
  • the light emitting element 11 is disposed opposite to the light guide plate 12, and the light incident surface 121 of the light guide plate 12 faces the light emitting element 11, so that the light emitted by the light emitting element 11 can enter the light guide plate 12 through the light incident surface 121;
  • a plurality of light guide grooves 1231 are provided in the plurality of light guide groove areas 123, and the orthographic projection of each light guide groove 1231 on the reflective surface 122 is curved in a curved direction toward the light emitting element 11, that is, That is to say, the extension trajectory of each light guide groove 1231 is arc-shaped, so that the plurality of light guide grooves 1231 in the plurality of light guide groove regions 123 can make the side of the reflection surface 122 close to the light emitting element 11 equivalent to the formation
  • the straight lines a with arrows shown in FIGS. 2 and 3 are the light paths of the light emitted by the light-emitting element 11 in the light guide plate 12 in some embodiments of the present disclosure, and the straight lines b shown in FIG. 2 are related technologies
  • the light path of the light emitted by the middle light emitting element in the light guide plate, and the light mixing distance of the light emitting element in the related art shown in FIG. 2 is d, and the light mixing distance of the light emitting element 11 in some embodiments of the present disclosure is c.
  • the exit angle of the light of the light emitting element 11 after entering the light guide plate 12 can be increased, and the light emitting element 11 can be reduced
  • the dark area and the light mixing distance can reduce the size of the lower black edge of the backlight module, thereby reducing the size of the lower black edge of the entire display device, and realize the design of the lower narrow edge of the display device.
  • the light-emitting element 11 may include a plurality of point light source elements 111, and each light guide groove area 123 corresponds to one point light source element 111 respectively.
  • the exit angle of the light emitted by the light emitting element 11 after entering the light guide plate 12 becomes larger, Therefore, the dark area between the point light source elements 111 is reduced, and the light mixing distance between the point light source elements 111 is also reduced accordingly.
  • each light guide groove area 123 a plurality of light guide grooves 1231 are sequentially arranged along a bending direction toward the point light source element 111 corresponding to the light guide groove area 123 .
  • each light guide groove region 123 a plurality of light guide grooves 1231 are sequentially arranged along the same bending direction toward the point light source element 111, that is, within the same light guide groove region 123
  • the orthographic projection (arc) of the light guide groove 1231 on the reflection surface 122 has the same bending direction, which can ensure that the light emitted from each point light source element 111 enters the light guide plate 12 and is reflected / refracted by the light guide groove 1231 to the light exit surface 124, so that The light has a sufficient exit angle.
  • each light guide groove area 123 a plurality of light guide grooves 1231 are disposed adjacent to each other, so that light entering through the light entrance surface 121 passes through the plurality of light guide grooves 1231
  • the reflection / refraction is more uniform, which is conducive to the reasonable layout of the structure.
  • adjacent light guide grooves 1231 are spaced apart.
  • the interval between adjacent light guide grooves 1231 is set, that is, a preset distance can be set between adjacent light guide grooves 1231, and here, the preset distance can be obtained in advance through multiple sets of experimental data, or based on historical experience. set up.
  • the preset distance between different adjacent light guide grooves 1231 may be the same or different, depending on the structure and arrangement of the light guide plate and the point light source element 111 The actual design requirements such as the light mixing distance between them are set.
  • a first light guide groove, a second light guide groove, and a third light guide groove are provided in this order, that is, the first The light guide groove and the second light guide groove are arranged adjacent to each other with a first distance between them, and the second light guide groove and the third light guide groove are arranged next to each other with a second distance between them.
  • the first spacing and the second spacing may be set to be the same or different according to actual structure setting requirements, light reflection / refraction angle requirements, and so on.
  • the light guide groove 1231 may be a V-shaped groove.
  • the multiple light guide grooves 1231 can be formed as multiple triangular prisms, so that the light emitted from the light emitting element 11 enters the light guide plate 12 The exit angle becomes larger.
  • the V-shaped angle of the V-shaped groove structure of the light guide groove 1231 can be set according to specific structural design requirements such as the thickness of the light guide plate 12 and the angle requirement of the exit angle, which is not limited in the embodiments of the present disclosure.
  • the light guide groove 1231 may also be a U-shaped groove or a trapezoidal groove and other shapes of groove body structures; or, it may be two or more types The shape of the groove structure is matched with each other.
  • a light guide groove area 123 may include a light guide groove 1231 with two groove structures such as a V-shaped groove and a U-shaped groove.
  • each light guide groove 1231 is arc-shaped orthographic projection on the reflection surface 122
  • the arc angle of is less than or equal to 180 degrees.
  • the light guide plate 12 is close to the light
  • the light emitting surface 124 on the side of the element 11 is formed with an inclined surface 1241 connected to the light incident surface 121, and the angle formed between the inclined surface 1241 and the light incident surface 121 is an acute angle.
  • the inclined surface 1241 and the light incident surface 121 and the reflective surface 122 close to the light emitting element 11 form a wedge-shaped structure, through which the light emitted from the light emitting element 11 can pass through
  • the light surface 121 enters the light guide plate 12, wherein the reflection surface 122 is provided with a plurality of light guide groove regions 123 corresponding to the inclined surface, so that the light entering the light guide plate 12 through the light entrance surface 121 (some of the light is passed through the inclined surface 1241 light guide groove area 123) can be reflected to the light exit surface 124 through the light guide groove area 123 to ensure that the light has a sufficient exit angle;
  • the inclined surface 1241 to form a wedge-shaped structure can enable the light guide plate 12 to be adapted more There are many light-emitting elements 11 having different light-emitting surface areas, and the thickness of the light guide plate 12 can be further reduced, which is advantageous for achieving lightness and thinness.
  • the value of the acute angle formed between the inclined surface 1241 and the light incident surface 121 is The angle should be greater than or equal to a preset angle.
  • the preset angle may be obtained in advance through multiple sets of experimental data, or may be preset according to historical experience. It can be understood that the greater the value of the acute angle, the smaller the slope of the inclined surface.
  • the light exit surface 124 is further formed with a flat surface 1242, the flat surface 1241 is parallel to the reflective surface 123, and the inclined surface 1241 is smoothly connected with the flat surface 1242.
  • the plane 1242 is arranged parallel to the reflecting surface 123, so that the light in the light guide plate 12 can exit through the plane 1242 to form a uniform light source.
  • the backlight module may further include: a flexible circuit board 13, and the light emitting element 11 is fixed to the flexible circuit board 13.
  • the light-emitting element 11 is fixedly disposed with the flexible circuit board 13 and electrically connected to the flexible circuit board 13, and the light-emitting element 11 emits light through the flexible circuit board 13.
  • the flexible circuit board 13 may be disposed above the light-emitting element 11, that is, the flexible circuit board 13 is adjacent to the light exit surface 124 of the light guide plate 12 Side, and connected with the light guide plate 12.
  • the flexible circuit board 13 may be disposed below the light-emitting element 11, that is, the flexible circuit board 13 is adjacent to the reflective surface 122 of the light guide plate 12 Side, and connected with the light guide plate 12.
  • the flexible circuit board 13 under the light-emitting element 11, it is possible to realize the reverse group design of the backlight, so that the size of the black border under the backlight module can be further reduced by reducing the installation size occupied by the flexible circuit board 13, The size of the lower black border of the display device is further reduced.
  • E is the size of the lower black border of the display device and F is the light mixing distance.
  • the lower black border size E of the display device can be reduced to 2.15 mm, and the light mixing distance can be reduced to within 0.8 mm.
  • a plurality of hemispherical structures may be provided on the emitting surface of the light guide plate to achieve diffuse reflection of the light in the light guide plate 12, so that the light from the light guide plate The light exit surface 124 of 12 exits to form a uniform light source.
  • the hemispherical structure is not provided in the light guide groove area 123.
  • a reflective film 14 may be provided under the light guide plate 12, that is, the backlight module may further include a reflective film 14, and the reflective film 14 is attached to The side of the light guide plate 12 close to the reflecting surface 122 is used to reflect the light emitted from the reflecting surface 122 so that the light is emitted from the light emitting surface 124 to form a uniform light source.
  • the backlight module may further include, for example, a diffusion film 15, a lower brightness enhancement film 16 and an upper brightness enhancement film 17, wherein the diffusion film 15 is attached to The side of the light guide plate 12 close to the light exit surface 124, the side of the lower brightness enhancement film 16 is attached to the side of the diffusion film 15 away from the light guide plate 12, and the other side of the lower brightness enhancement film 16 and the upper brightness enhancement film 17 fitting settings.
  • the backlight module may further include structures such as a frame 18 and a plastic frame.
  • a plurality of light guide groove regions are provided on the side of the light guide plate close to the light emitting element, and each light guide groove region includes a plurality of light guide grooves, which can increase light emission
  • the exit angle of the light of the element after entering the light guide plate reduces the dark area of the light emitting element and the light mixing distance, thereby reducing the size of the lower black border of the backlight module, thereby reducing the size of the lower black border of the display device, and achieving display
  • the lower narrow side of the device is designed, and on the basis of ensuring that all light enters the light guide plate, it can help to reduce the thickness of the light guide plate and achieve lightness and thinness.
  • some embodiments of the present disclosure also provide a display device including the backlight module described above.
  • the display device further includes a liquid crystal display screen 21, which is disposed above the backlight module, that is, the liquid crystal display screen 21 is disposed on a side close to the light exit surface 124 of the light guide plate 12,
  • the light emitted from the light emitting element 11 of the backlight module enters through the light incident surface 121 of the light guide plate 12 and exits through the light exit surface 124 of the light guide plate 12 to provide the LCD screen 21 with a uniformly distributed light source.
  • the display device may further include a protective cover 22 that is disposed above the liquid crystal display 21, that is, the protective cover 22 is disposed on a side of the liquid crystal display 21 away from the backlight module.
  • the protective cover 22 and the liquid crystal display 21 are connected by OCA optical glue 23.
  • the display device may further include a series of basic components such as a motherboard and a housing for accommodating various components, which will not be repeated in the embodiments of the present disclosure.
  • the display device may be a mobile phone or a tablet computer.
  • the display device is not limited to mobile phones and tablet computers, but it can also be a laptop computer (Laptop Computer) or a personal digital assistant (Personal Digital Assistant (PDA), etc., etc. with other LCD screens including a backlight module Electronic device.
  • laptop Computer Laptop Computer
  • PDA Personal Digital Assistant
  • a display device provided with the above-mentioned backlight module, since the backlight module can increase the exit angle of light from the light-emitting element after entering the light guide plate, reduce the dark area of the light-emitting element and the mixing distance, The size of the black border under the backlight module can be reduced, and on the basis of ensuring that all light enters the light guide plate, the thickness of the light guide plate can be reduced, and the thickness of the light guide plate can be reduced. Therefore, the size of the bottom black border of the entire display device can be reduced To realize the design of the lower narrow side of the display device, at the same time, it can also reduce the thickness of the whole machine, and realize the thin and light design of the display device.
  • the terms “include”, “include” or any other variants thereof are intended to cover non-exclusive inclusion, so that processes, methods, Articles or devices include not only those elements, but also other elements that are not explicitly listed, or include elements inherent to such a process, method, article, or device. Without more restrictions, the element defined by the sentence “include one " does not exclude that there are other identical elements in the process, method, article or device that includes the element.
  • the terms “installation”, “connected”, “connected”, “fixed”, “set” and other terms should be understood in a broad sense, for example, it can be a fixed connection or a It is a detachable connection or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediary, it can be the connection between two components or the interaction between two components.
  • installation can be a fixed connection or a It is a detachable connection or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediary, it can be the connection between two components or the interaction between two components.
  • present disclosure may repeat reference numerals and / or letters in different embodiments or examples. This repetition is for simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.
  • relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that between these entities or operations There is any such actual relationship or order.

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  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
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  • Mathematical Physics (AREA)
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  • Planar Illumination Modules (AREA)

Abstract

一种背光模组及显示装置，该背光模组包括：发光元件（11）；导光板（12），导光板（12）的反射面靠近发光元件（11）的一侧设置有多个导光槽区域（123），每一导光槽区域（123）均包括多个导光槽（1231），每一个导光槽（1231）在反射面（122）上的正投影呈弧形，且弧形的弯曲方向朝向发光元件（11）；以及发光元件（11）朝向导光板的入光面（121）出射的光线，经导光槽（1231）反射至导光板（12）的出光面（124）。

Description

背光模组及显示装置
相关申请的交叉引用
本申请主张在2018年11月5日在中国提交的中国专利申请号No.201811307056.6的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及电子技术领域，尤其涉及一种背光模组及显示装置。
背景技术
手机、平板等电子产品既要满足握持手感，同时也要满足用户对于屏幕尺寸的需求，也就是说，需要在有限的产品尺寸内将显示区域尽量做大，即提高产品的屏占比。因而，如今全面屏设计成了行业发展的一种趋势。
如图1所示为相关技术的显示装置的结构示意图，1.1为上黑边区域，1.2为左黑边区域，1.3为右黑边区域，1.4为显示区域，1.5为下黑边区域，目前液晶显示屏的结构要减小下黑边区域1.5的宽度已经非常困难。限制下黑边区域的尺寸的一个核心原因是，点光源通过导光板转换成面光源需要一个混光距离，这里，点光源的光线按一定的出射角朝导光板出射，此时两个点光源之间会形成一个无光线照射的暗区，而点光源到暗区顶点的距离就是混光距离。而相关技术中，在光线经导光板的入光面进入后，为避免光线反射次数过多导致光线传播损耗过多以及显示区域1.4下边缘出现亮边，使得该混光距离难以缩小。
发明内容
本公开提供一种背光模组及显示装置，以解决相关技术中显示装置的下黑边区域难以减小的问题。
为了解决上述技术问题，本公开是这样实现的：
第一方面，本公开的一些实施例提供一种背光模组，包括：
发光元件；
导光板，导光板的反射面靠近发光元件的一侧设置有多个导光槽区域，每一导光槽区域均包括多个导光槽，每一个导光槽在反射面上的正投影呈弧形，且弧形的的弯曲方向朝向发光元件；以及
发光元件朝向导光板的入光面出射的光线，经导光槽反射至导光板的出光面。
第二方面，本公开的一些实施例提供一种显示装置，包括上述的背光模组。
在本公开实施例中，通过导光板的反射面靠近发光元件的一侧设置多个导光槽区域，每一导光槽区域均包括多个导光槽，且每一个导光槽在反射面上的正投影呈弯曲方向朝向发光元件的弧形，能够增大发光元件的光线进入导光板后的出射角，减小发光元件的暗区以及混光距离，从而能够减小背光模组下黑边尺寸，进而减小显示装置整机的下黑边尺寸，实现显示装置的下窄边设计，并且，在确保光线全部进入导光板的基础上能够利于减小导光板的厚度，实现轻薄化。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对本公开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性的前提下，还可以根据这些附图获得其他的附图。
图1表示相关技术的显示装置的结构示意图；
图2表示本公开的一些实施例提供的背光模组的结构示意图之一；
图3表示本公开的一些实施例提供的背光模组的结构示意图之二；
图4表示本公开的一些实施例提供的背光模组的结构示意图之 三；以及
图5表示本公开的一些实施例提供的背光模组的结构示意图之四。
具体实施方式
为使本公开要解决的技术问题、技术方案和优点更加清楚，下面将结合附图及具体实施例进行详细描述。
图2示出的是本公开的一些实施例提供的背光模组的结构示意图之一，图3示出的是本公开的一些实施例提供的背光模组的结构示意图之二，图4示出的是本公开的一些实施例提供的背光模组的结构示意图之三。
请参见图2至图4，本公开的一些实施例提供一种背光模组，可以包括：
发光元件11；
导光板12，导光板12的反射面122靠近发光元件11的一侧设置有多个导光槽区域123，每一导光槽区域123均包括多个导光槽1231，每一个导光槽1231在反射面122上的正投影呈弧形，且弧形的弯曲方向朝向发光元件11；
发光元件11朝向导光板12的入光面121出射的光线，经导光槽1231反射至导光板12的出光面124。
在本公开实施例中，导光板12包括入光面121、反射面122以及出光面124，入光面121用于接收发光元件11出射的光线并将光线导入到导光板12内部，反射面122用于将由入光面121导入到导光板12内部的一部分光线进行反射，以使该部分光线由出光面124射出。如图3所示，发光元件11与该导光板12相对设置，且导光板12的入光面121朝向发光元件11，以使发光元件11出射的光线能够经入光面121进入导光板12；结合参见图2，多个导光槽区域123内设置有多个导光槽1231，且每一个导光槽1231在反射面122上的正投影呈弯曲方向朝向发光元件11的弧形，也即是说，每一个导光槽 1231的延伸轨迹呈弧形，这样，通过多个导光槽区域123内的多个导光槽1231，能够使反射面122靠近发光元件11的一侧相当于形成有多个三棱镜，从而能够利用三棱镜的反射和折射工作原理，使得经导光板12的入光面121进入的光线通过多个导光槽1231的反射/折射得以增大光线的出射角，进而能够使得发光元件11的暗区变小，其混光距离也相应变小，并且，由于多个导光槽1231能够增加进入导光板12的光线的出射角，在确保光线全部进入导光板12的基础上能够利于减小导光板12的厚度，实现轻薄化。其中，图2和图3中示出的带箭头的直线a为本公开的一些实施例中发光元件11出射的光线在导光板12内的光线路径，图2中示出的直线b为相关技术中发光元件出射的光线在导光板内的光线路径，并且如图2示出的相关技术中发光元件的混光距离为d，本公开的一些实施例中发光元件11的混光距离为c。
在本公开的一些实施例中，通过多个导光槽区域123中包括的多个导光槽1231，能够增大发光元件11的光线进入导光板12后的出射角，减小发光元件11的暗区以及混光距离，从而能够减小背光模组下黑边尺寸，进而减小显示装置整机的下黑边尺寸，实现显示装置的下窄边设计。
具体地，在本公开一个可选的实施例中，如图2所示，发光元件11可以包括多个点光源元件111，每一导光槽区域123分别对应一个点光源元件111。在本公开的一些实施例中，通过与每一点光源元件111对应的导光槽区域123中设置的多个导光槽1231，发光元件11出射的光线进入导光板12之后的出射角变大，从而减小点光源元件111之间的暗区，使点光源元件111之间的混光距离也相应减小。
请参见图2，在本公开一个可选的实施例中，每一个导光槽区域123中，多个导光槽1231沿朝向与导光槽区域123对应的点光源元件111的弯曲方向依次设置。在本公开的一些实施例中，在每一导光槽区域123中，通过多个导光槽1231沿朝向点光源元件111的同一弯曲方向依次排布设置，即同一导光槽区域123内的导光槽1231在 反射面122上的正投影(弧形)的弯曲方向相同，能够确保每一点光源元件111出射的光线进入导光板12之后通过导光槽1231反射/折射至出光面124，使光线具备足够的出射角。
其中，在本公开一个可选的实施例中，每一个导光槽区域123中，多个导光槽1231邻接设置，从而以使经入光面121进入的光线通过多个导光槽1231的反射/折射更为均匀，利于实现结构的合理布局。
进一步地，在本公开的一些实施例中，每一个导光槽区域123中，相邻的导光槽1231之间间隔设置。这里，相邻的导光槽1231之间间隔设置，即相邻的导光槽1231之间可以设置预设间距，这里，预设间距可以预先通过多组实验数据得到，也可以根据历史经验预先设定。其中，在本公开的一些实施例中，不同的相邻导光槽1231之间的预设间距可以是相同的，也可以是不同的，具体根据导光板的结构、布置以及点光源元件111之间的混光距离等等实际设计需求进行设置，例如，在一导光槽区域123中，包括依次设置的第一导光槽、第二导光槽和第三导光槽，即，第一导光槽与第二导光槽相邻设置且两者之间设置有第一间距，第二导光槽与第三导光槽相邻设置且两者之间设置有第二间距，这里，第一间距与第二间距可以根据实际结构设置要求、光线反射/折射角度要求等设置为相同或者设置为不同。
其中，在本公开一个可选的实施例中，如图3所示，该导光槽1231可以为V型槽。在本公开的一些实施例中，通过将导光槽1231设置为V型槽结构，以使多个导光槽1231能够形成为多个三棱镜，使得发光元件11出射的光线进入导光板12之后的出射角变大。其中，对于导光槽1231的V型槽结构的V型角度可以根据导光板12的厚度以及出射角的角度需求等具体结构设计要求进行设置，本公开实施例不对此进行限定。另外，根据实际的设置需求，在多个导光槽区域123中，该导光槽1231也可以为U型槽或梯形槽等其他形状构成的槽体结构；或者，也可以是两种或以上形状构成的槽体结构相互配合，例如，在一导光槽区域123中可以包括有V型槽和U型槽等两种槽体结构的导光槽1231。
有利地，在本公开的一些实施例中，为确保光线在导光板12内的出射方向，在每一导光槽区域123中，每一导光槽1231在反射面122上的弧形正投影的圆弧角度小于或等于180度。
另外，结合考虑显示装置的厚度设计需求，并确保发光元件11出射的光线能够都进入导光板12，请参见图3和图4，在本公开一个可选的实施例中，导光板12靠近发光元件11一侧的出光面124形成有一倾斜面1241，倾斜面1241与入光面121连接，且倾斜面1241与入光面121之间形成的夹角为锐角。在本公开的一些实施例中，该倾斜面1241与入光面121和靠近发光元件11一侧的反射面122构成一楔形结构，通过该楔形结构以使发光元件11出射的光线能够全部经入光面121进入导光板12，其中，反射面122设置有多个导光槽区域123与倾斜面对应设置，使经入光面121进入导光板12的光线(其中有部分光线是经倾斜面1241导向导光槽区域123)能够通过导光槽区域123反射至出光面124，确保光线具备足够的出射角；另外，通过倾斜面1241以构成楔形结构，能够使得该导光板12得以适配更多具备不同发光表面积的发光元件11，并且，能够进一步减小导光板12的厚度，利于实现轻薄化。
需要说明的是，为避免光线在倾斜面1241所构成的楔形结构内发生过多光反射损耗，在本公开的一些实施例中，倾斜面1241与入光面121之间所形成锐角的取值角度应大于或等于一预设角度，这里，该预设角度可以预先通过多组实验数据得到，也可以根据历史经验预先设定。可以理解的是，该锐角的取值角度越大，该倾斜面的坡度越小。
进一步地，本公开的一些实施例中，出光面124还形成有一平面1242，平面1241与反射面123平行，且倾斜面1241与平面1242平滑连接。其中，通过该平面1242与反射面123平行设置，以使导光板12内的光线能够通过该平面1242射出形成均匀的光源。
在本公开一个可选的实施例中，该背光模组还可以包括：柔性电路板13，发光元件11固定于柔性电路板13。在本公开的一些实施例 中，该发光元件11与柔性电路板13固定设置，且电连接于该柔性电路板13，通过该柔性电路板13实现发光元件11的发光。其中，在本公开一个可选的实施例中，如图3所示，该柔性电路板13可以设置于发光元件11的上方，即，该柔性电路板13邻近于导光板12的出光面124一侧，并与导光板12连接。
或者，在本公开另一个可选的实施例中，如图4所示，该柔性电路板13可以设置于发光元件11的下方，即，柔性电路板13邻近于导光板12的反射面122一侧，并与导光板12连接。这里，通过该柔性电路板13设置于发光元件11的下方，能够实现背光源反组设计，从而能够通过减小柔性电路板13所占用的设置尺寸，进一步减小背光模组下黑边尺寸，使得显示装置的下黑边尺寸进一步减小，其中，图4中，E为显示装置的下黑边尺寸，F为混光距离。在一示例中，该显示装置的下黑边尺寸E可以减小到2.15mm，该混光距离可以减小到0.8mm以内。
可选地，在本公开的一些实施例中，在导光板12中，其发射面上可以设置多个半球形结构，用于实现光线在导光板12内的漫反射，从而使光线从导光板12的出光面124出射形成均匀的光源。其中，在本公开的一些实施例中，在导光槽区域123内不设置该半球形结构。
另外，在本公开的一些实施例中，如图5所示，在导光板12的下方可以设置反射膜14，即，该背光模组还可以包括反射膜14，该反射膜14贴合设置于导光板12靠近反射面122的一侧，用于对从反射面122射出的光线进行反射，以使光线从出光面124射出形成均匀的光源。
此外，在本公开的一些实施例中，如图5所示，背光模组还可以包括诸如扩散膜15、下增亮膜16和上增亮膜17等，其中该扩散膜15贴合设置于导光板12靠近出光面124的一侧，该下增亮膜16的一侧贴合设置于扩散膜15远离导光板12的一侧，且下增亮膜16的另一侧与上增亮膜17贴合设置。进一步的，在本公开的一些实施例中，该背光模组还可以包括诸如框体18以及胶框等等结构。
本公开的一些实施例提供的背光模组，通过导光板的反射面靠近发光元件的一侧设置多个导光槽区域，每一导光槽区域均包括多个导光槽，能够增大发光元件的光线进入导光板后的出射角，减小发光元件的暗区以及混光距离，从而能够减小背光模组下黑边尺寸，进而减小显示装置整机的下黑边尺寸，实现显示装置的下窄边设计，并且，在确保光线全部进入导光板的基础上能够利于减小导光板的厚度，实现轻薄化。
另外，本公开的一些实施例还提供一种显示装置，包括上述的背光模组。
其中，请参见图5，该显示装置还包括液晶显示屏21，该液晶显示屏21设置于该背光模组上方，即该液晶显示屏21设置于靠近导光板12的出光面124的一侧，背光模组的发光元件11出射的光线，经导光板12的入光面121进入，并经导光板12的出光面124射出，为液晶显示屏21提供分布均匀的光源。
另外，该显示装置还可以包括保护盖板22，该保护盖板22设置于该液晶显示屏21上方，即，该保护盖板22设置于液晶显示屏21远离背光模组的一侧。具体的，该保护盖板22与液晶显示屏21通过OCA光学胶23连接。此外，在本公开的一些实施例中，该显示装置还可以包括诸如主板以及用于容置各个部件的壳体等等一系列基本部件，本公开实施例中对此不再一一赘述。
在本公开的一些实施例中，该显示装置可以为手机或平板电脑。当然，该显示装置并不局限于手机和平板电脑，其还可以为膝上型电脑(Laptop Computer)或个人数字助理(Personal Digital Assistant，PDA)等等其他具备包括有背光模组的液晶显示屏的电子设备。
在本公开的一些实施例中，具备上述背光模组的显示装置，由于背光模组能够增大发光元件的光线进入导光板后的出射角，减小发光元件的暗区以及混光距离，从而能够减小背光模组下黑边尺寸，并且，在确保光线全部进入导光板的基础上能够利于减小导光板的厚度，实现轻薄化，因此，能够减小显示装置整机的下黑边尺寸，实现显示装 置的下窄边设计，同时，还能够减小整机厚度，实现显示装置的轻薄化设计。
应理解，说明书的描述中，提到的参考术语“一实施例”、“一个实施例”或“一些实施例”意味着与实施例有关的特定特征、结构或特性包括在本公开的至少一个实施例或示例中。因此，在整个说明书各处出现的“在一实施例中”、“在一个实施例中”或“在一些实施例中”未必一定指相同的实施例。此外，在本公开的一个附图或一种实施例中描述的元素、结构或特征可以与一个或多个其它附图或实施例中示出的元素、结构或特征以任意适合的方式相结合。
需要说明的是，在本文中的一个或多个实施例中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
在本公开中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”、“设置”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本公开中的具体含义。
另外，本公开可以在不同实施例或示例中重复参考数字和/或字母。这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施例和/或设置之间的关系。
此外，在发明实施例中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。
上面结合附图对本公开的实施例进行了描述，但是本公开并不局 限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本公开的启示下，在不脱离本公开宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本公开的保护之内。

Claims (12)

  1. 一种背光模组，包括：
    发光元件；
    导光板，所述导光板的反射面靠近所述发光元件的一侧设置有多个导光槽区域，每一导光槽区域均包括多个导光槽，每一个所述导光槽在所述反射面上的正投影呈弧形，且所述弧形的弯曲方向朝向所述发光元件；以及
    所述发光元件朝向所述导光板的入光面出射的光线，经所述导光槽反射至所述导光板的出光面。
  2. 根据权利要求1所述的背光模组，其中，所述发光元件包括多个点光源元件，每一所述导光槽区域分别对应一个点光源元件。
  3. 根据权利要求2所述的背光模组，其中，每一个所述导光槽区域中，多个所述导光槽沿朝向与所述导光槽区域对应的所述点光源元件的弯曲方向依次设置。
  4. 根据权利要求3所述的背光模组，其中，每一个所述导光槽区域中，多个所述导光槽邻接设置。
  5. 根据权利要求3或4所述的背光模组，其中，每一个所述导光槽区域中，相邻的所述导光槽之间间隔设置。
  6. 根据权利要求1所述的背光模组，其中，所述导光槽为V型槽。
  7. 根据权利要求1所述的背光模组，其中，所述导光板靠近所述发光元件一侧的出光面形成有一倾斜面，所述倾斜面与所述入光面连接，且所述倾斜面与所述入光面之间形成的夹角为锐角。
  8. 根据权利要求7所述的背光模组，其中，所述出光面还形成有一平面，所述平面与所述反射面平行，且所述倾斜面与所述平面平滑连接。
  9. 根据权利要求1所述的背光模组，还包括：柔性电路板，所述发光元件固定于所述柔性电路板。
  10. 根据权利要求9所述的背光模组，其中，所述柔性电路板邻近于所述导光板的出光面一侧，并与所述导光板连接。
  11. 根据权利要求9所述的背光模组，其中，所述柔性电路板邻近于所述导光板的反射面一侧，并与所述导光板连接。
  12. 一种显示装置，包括如权利要求1至11任一项所述的背光模组。
PCT/CN2019/113596 2018-11-05 2019-10-28 背光模组及显示装置 WO2020093892A1 (zh)

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