WO2021063081A1 - 直下式背光模组、液晶显示屏及终端设备 - Google Patents

直下式背光模组、液晶显示屏及终端设备 Download PDF

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Publication number
WO2021063081A1
WO2021063081A1 PCT/CN2020/102761 CN2020102761W WO2021063081A1 WO 2021063081 A1 WO2021063081 A1 WO 2021063081A1 CN 2020102761 W CN2020102761 W CN 2020102761W WO 2021063081 A1 WO2021063081 A1 WO 2021063081A1
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Prior art keywords
plate
backlight module
type backlight
direct type
module according
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PCT/CN2020/102761
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English (en)
French (fr)
Inventor
廖金海
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广州视源电子科技股份有限公司
广州视睿电子科技有限公司
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Publication of WO2021063081A1 publication Critical patent/WO2021063081A1/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
    • G02F1/133602—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
    • G02F1/133606—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
    • G02F1/133608—Direct backlight including particular frames or supporting means

Definitions

  • This application relates to the technical field of display devices, and in particular to a direct-lit backlight module, a liquid crystal display screen and a terminal device.
  • the liquid crystal display has become the mainstream display in the market due to its low electromagnetic radiation, low power consumption, low heat generation, light and thinness, etc.
  • the LED backlight display has also been widely used.
  • the LED backlight displays on the market are mainly divided into two types, side-type and direct-type, according to the light input method.
  • the side-entry type is to install the LED light string of the backlight module around the LCD screen
  • the direct type is to install the LED light string of the backlight module on the front and back of the LCD screen.
  • the direct-lit backlight display has a higher cost. Low applications are more extensive.
  • the common support pillars are made of PC and PMMA, which are generally transparent or white, and have different shapes.
  • the support pillar is prone to shadows, especially when it is a direct-lit backlight module. The smaller the size, the more obvious the shadow of the support column. At this time, more films are needed for shielding, which will increase the cost of the backlight module.
  • the thickness of the direct-type display cannot be extremely thin.
  • the purpose of the embodiments of the present application is to provide a direct type backlight module, liquid crystal display and terminal equipment, which does not need to be provided with supporting columns to support the diffuser plate, the backlight effect and the display effect are good, and the diffuser plate and the back plate are between The distance is smaller and the overall thickness is thinner.
  • a direct type backlight module including a back plate, a diffuser plate, and a PCB board, the back plate and the diffuser plate are spaced apart, and the PCB board is arranged on the back plate close to the diffuser plate
  • a light source is provided on the PCB, and the surface of the light source abuts the diffuser plate.
  • the surface of the light source is protrudingly provided with at least one supporting protrusion, and the supporting protrusion abuts against the diffuser plate.
  • the surface of the light source is annularly distributed with at least three supporting protrusions along the center of the light source.
  • the light source is LED lamp beads, and a plurality of the LED lamp beads are evenly distributed on the PCB board.
  • the backplane is a flat sheet structure, and the periphery of the backplane is provided with an inner frame, and the inner frame has a first side surface and a second side surface opposite to each other.
  • the edge of the diffusion plate is arranged on the first side surface, and the second side surface abuts against the back plate.
  • a film pressing member is connected to the inner frame, an optical film is arranged on the side of the diffusion plate away from the light source, and the film pressing member includes A film pressing plate with parallel sides and spaced apart, the diffusion plate and the optical film are arranged between the film pressing plate and the first side surface.
  • a suspension post is protrudingly provided on the first side surface, and a suspension hole for inserting and mating with the suspension post is opened on the optical film.
  • the film pressing member further includes a connecting plate and a mounting plate, the mounting plate is vertically connected to one end of the connecting plate, and the film pressing plate is vertically connected to the connecting plate. The other end of the board;
  • the inner frame has a stepped surface, the distance between the stepped surface and the second side surface is L1, the distance between the first side surface and the second side surface is L2, and L2 is greater than L1, and the installation
  • the board is arranged on the step surface.
  • the film pressing plate is arranged on the side of the connecting plate close to the center of the optical film, and the mounting plate is arranged on the connecting plate away from the optical film.
  • the film pressing plate is arranged on the side of the connecting plate close to the center of the optical film, and the mounting plate is arranged on the connecting plate away from the optical film.
  • the optical film is provided with an OC and a glass cover in sequence on the side away from the diffuser plate, and an outer frame is provided on the periphery of the glass cover, and the outer frame It includes a body, and a support platform is protruded from one side of the body close to the glass cover plate, and the support platform is used to support the glass cover plate.
  • a supporting frame is provided on the supporting table, and the side of the supporting frame away from the supporting table is bonded to the glass cover through an adhesive layer.
  • the film pressing member further includes a connecting plate and a mounting plate, the film pressing plate and the mounting plate are respectively arranged on two opposite sides of the connecting plate, and the support The side of the table away from the glass cover abuts against the side of the mounting plate away from the inner frame.
  • the body shields the edge of the glass cover plate, the edge of the back plate, and the area between the glass cover plate and the back plate, and the body blocks the edge of the glass cover plate, the edge of the back plate, and the area between the glass cover plate and the back plate.
  • a side surface close to the support platform abuts against the edge of the back plate.
  • the main body has a plate-shaped structure, and the thickness direction of the main body is arranged in a direction parallel to the glass cover plate.
  • liquid crystal display screen including the direct type backlight module described above.
  • a terminal device including the direct type backlight module described above.
  • the beneficial effects of the embodiments of the present application are: by directly abutting the surface of the light source with the diffuser plate, the light source can be used as the support structure of the diffuser plate to support the diffuser plate, eliminating the need for supporting pillars, improving the backlight and display effects, and
  • the distance between the diffuser plate and the back plate is only the sum of the thickness of the PCB board and the light source, which greatly reduces the overall thickness of the direct type backlight module.
  • FIG. 1 is a schematic cross-sectional view of a direct type backlight module according to an embodiment of the application.
  • connection shall be interpreted broadly, for example, they may be fixedly connected, detachably connected, or integrated. ; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components.
  • connection shall be interpreted broadly, for example, they may be fixedly connected, detachably connected, or integrated. ; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components.
  • the "above” or “below” of the first feature of the second feature may include direct contact between the first and second features, or may include the first and second features Not in direct contact but through other features between them.
  • “above”, “above” and “above” the second feature of the first feature include the first feature being directly above and obliquely above the second feature, or only that the level of the first feature is higher than the second feature.
  • the “below”, “below” and “below” the first feature of the second feature include the first feature directly below and obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.
  • the embodiment of the present application discloses a direct type backlight module, which includes a back plate 1 and a diffuser plate 2, an optical film 7, an OC9 (liquid crystal panel), and a glass cover sequentially arranged on one side of the back plate 1.
  • the board 10 wherein the back board 1 and the diffuser board 2 are spaced apart, a PCB board 3 is arranged on the side of the back board 1 close to the diffuser board 2, and a light source is arranged on the PCB board 3, and the surface of the light source abuts the diffuser board 2 .
  • the light source can be used as the supporting structure of the diffuser plate 2 to support the diffuser plate 2, eliminating the need for supporting pillars, improving the backlight and display effect, and the diffuser plate 2 and the back plate
  • the spacing between 1 is only the sum of the thickness of the PCB board 3 and the light source, which greatly reduces the overall thickness of the direct type backlight module.
  • the light source is an LED lamp bead 4, and the LED lamp bead 4 has an injection-molded housing, the housing is light-transmissive, and the diffusion plate 2 can directly abut on the surface of the housing.
  • the injection-molded shell is not easy to be crushed by the diffuser 2 and has a long service life.
  • a plurality of LED lamp beads 4 are evenly distributed on the PCB board 3, and the evenly distributed LED lamp beads 4 can provide a stable support plane for the diffuser plate 2.
  • the surface of the LED lamp bead 4 is protrudingly provided with at least one supporting protrusion 41, and the supporting protrusion 41 abuts against the diffusion plate 2.
  • the supporting protrusion 41 By providing the supporting protrusion 41, the contact area of the LED lamp bead 4 and the diffuser plate 2 can be reduced, and the heat of the LED lamp bead 4 can be prevented from being transferred to the diffuser plate 2 too much.
  • At least three supporting protrusions 41 are annularly distributed along the center of the LED lamp bead 4 on the surface of the LED lamp bead 4.
  • the surface of the LED lamp bead 4 has four supporting protrusions 41 distributed annularly along the center of the LED lamp bead 4.
  • the back plate 1 is a flat plate structure, and an inner frame 5 is provided on the periphery of the back plate 1, and the inner frame 5 has a first side 51 and a second side 52 that are oppositely disposed.
  • the edge of the diffuser plate 2 is arranged on the first side surface 51, and the second side surface 52 abuts the back plate 1.
  • the inner frame 5 is connected to the back plate 1 by screws.
  • other connection methods may be used to connect the inner frame 5 and the back plate 1, such as an adhesive method.
  • a film pressing member 6 is connected to the inner frame 5, and the film pressing member 6 includes a film pressing plate 61 that is parallel to the first side surface 51 and arranged at intervals.
  • the optical film 7 is disposed between the pressing film plate 61 and the first side surface 51.
  • the pressing film member 6 can be connected to the inner frame 5 by screws. In other embodiments, other connection methods may be used to connect the film pressing member 6 and the inner frame 5, such as an adhesive method.
  • a foam is provided on the side of the pressing film plate 61 close to the optical film 7, and the foam is pressed against the optical film 7.
  • the foam can prevent the optical film 7 from directly contacting the rigid film pressing plate 61, and avoid the optical film 7 from being damaged.
  • the film pressing plate 61 is combined with foam to compress the optical film 7, and it can also be the optical film 7.
  • the expansion of the optical film 7 provides a buffer space to prevent the optical film 7 from wrinkling after expansion.
  • a suspension post 8 is protrudingly provided on the first side surface 51, and a suspension hole for inserting and mating with the suspension post 8 is opened on the optical film 7.
  • the edge of the optical film 7 may be protrudingly provided with a plurality of hanging ears, and the hanging ears are provided with this hanging hole.
  • the film pressing member 6 further includes a connecting plate 62 and a mounting plate 63, the mounting plate 63 is vertically connected to one end of the connecting plate 62, and the film pressing plate 61 is vertically connected to the other end of the connecting plate 62,
  • the inner frame 5 has a step surface 53, the distance between the step surface 53 and the second side surface 52 is L1, and the distance between the first side surface 51 and the second side surface 52 is L2, L2 Larger than L1, the mounting plate 63 is arranged on the stepped surface 53.
  • the film pressing plate 61 is arranged on the side of the connecting plate 62 close to the center of the optical film 7, and the mounting plate 63 is arranged on the side of the connecting plate 62 away from the center of the optical film 7 . That is, the cross-sectional structure of the film pressing member 6 is Z-shaped, and the film pressing member 6 of this structure is convenient to connect with the inner frame 5, and at the same time, it does not occupy the space between the inner frame 5 and the diffuser 2, which is convenient for the diffuser 2 and the LED.
  • the surface of the lamp bead 4 abuts.
  • the cross-sectional structure of the film pressing member 6 is not limited to a Z-shaped structure, but may also be a U-shaped, L-shaped, or other structure.
  • An outer frame 11 is provided on the periphery of the glass cover plate 10, the outer frame 11 includes a body 111, and a support platform 112 is protrudingly provided on a side of the body 111 close to the glass cover plate 10, and the support platform 112 Used to support the glass cover plate 10.
  • a supporting frame 12 is provided on the supporting table 112, and the side of the supporting frame 12 away from the supporting table 112 is bonded to the glass cover plate 10 through an adhesive layer.
  • the support frame 12 is a strip structure, the length of which extends along the length direction of the outer frame 11, and the support frame 12 is fixed on the support platform 112 by screws.
  • the support frame 12 is made of aluminum alloy, which can reduce the weight of the support frame 12, thereby reducing the weight of the entire backlight display module.
  • the side of the support platform 112 away from the glass cover plate 10 abuts on a side of the mounting plate 63 away from the inner frame 5.
  • the support table 112 is connected to the film pressing plate 61 of the film pressing member 6 by screws, and the film pressing member 6 is connected to the inner frame 5 by screws, and the inner frame 5 is connected to the back plate 1 by screws.
  • the part 6, the inner frame 5 and the back plate 1 are fixed by the same screw, which can reduce the number of screws used. In other embodiments, different screws can also be used to fix separately.
  • the main body 111 shields the edge of the glass cover 10, the edge of the back plate 1, and the area between the glass cover 10 and the back plate 1, and the main body 111 is close to One side surface of the support platform 112 abuts against the edge of the back plate 1.
  • the main body 111 is a plate-shaped structure, and the thickness direction of the main body 111 is arranged in a direction parallel to the glass cover plate 10.
  • an ultra-narrow frame structure can be formed, that is, the area of the main body 111 exposed on the display side of the glass cover plate 10 is small, and an ultra-narrow frame structure can be realized.
  • a side surface of the main body 111 facing away from the supporting platform 112 is a convex arc surface.
  • An embodiment of the present application also provides a liquid crystal display, including the direct-lit backlight module of any of the above embodiments, and the specific structure of the direct-lit backlight module will not be repeated here.
  • the embodiment of the present application also provides a terminal device, including the direct-lit backlight module of any of the above embodiments, and the specific structure of the direct-lit backlight module will not be repeated here.
  • the terminal device can be a smart interactive tablet and other devices, such as a conference machine, which integrates a computer, a projector, an electronic whiteboard, a TV, an advertising player, and a speaker, with writing, annotation, synchronous interaction, multimedia, remote video conferencing, etc.
  • a conference machine which integrates a computer, a projector, an electronic whiteboard, a TV, an advertising player, and a speaker, with writing, annotation, synchronous interaction, multimedia, remote video conferencing, etc.
  • Functions, integrating multiple technologies such as high-definition display, human-computer interaction, multimedia information processing and network transmission, are often used in government and enterprise conference rooms, media studios, education and training institutions and other places.
  • a touch layer 13 is also provided between the glass cover 10 and the OC9 of the smart interactive tablet for realizing functions such as touch and writing.
  • an embodiment or the like means that a specific feature, structure, material, or characteristic of the embodiment is included in at least one embodiment or example of the present application in combination with the specific feature, structure, material, or characteristic of the embodiment.
  • the schematic representation of the above-mentioned terms does not necessarily refer to the same embodiment.

Abstract

本申请涉及显示设备技术领域，具体公开一种直下式背光模组、液晶显示屏及终端设备，其中，直下式背光模组包括背板、扩散板和PCB板，背板与扩散板间隔设置，PCB板设置在背板靠近扩散板的一侧，PCB板上设有光源，光源的表面与扩散板抵接。通过将光源的表面直接与扩散板抵接，可以利用光源作为扩散板的支撑结构支撑扩散板，省去了支撑柱的使用，提升了背光和显示效果，并且扩散板与背板之间的间距仅为PCB板和光源的厚度之和，极大地缩小了直下式背光模组的整体厚度。

Description

直下式背光模组、液晶显示屏及终端设备
本申请要求于2019年9月30日提交至中国国家知识产权局、申请号为201921673901.1、发明名称为“直下式背光模组、液晶显示屏及终端设备”的专利申请的优先权。
技术领域
本申请涉及显示设备技术领域，尤其涉及一种直下式背光模组、液晶显示屏及终端设备。
背景技术
传统技术中，液晶显示器由于具有电磁辐射低、功耗低、发热量少、轻薄等特点，已经成为市面的主流显示器，LED背光显示器也获得广泛的应用。而目前市面上的LED背光显示器根据入光方式主要分为侧入式和直下式两种。其中，侧入式是将背光模组的LED灯串安装在液晶屏的四周，而直下式是将背光模组的LED灯串安装在液晶屏的正背面，相对来说直下式背光显示器成本较低应用更广泛。
目前，直下式显示器为了实现良好的背光效果和结构的稳定性，一般都需要采用多个支撑柱来支撑扩散板。其中，常见的支撑柱有PC和PMMA材质，一般为透明或者白色，形状不一，但不论什么材质的支撑柱均有个缺点，支撑柱处容易产生阴影，特别是当直下式背光模组的尺寸越小时，支撑柱的阴影会更加明显，此时需要更多的膜片来做遮蔽，这样会增加背光模组的成本。另外，现有的直下式显示器由于扩散板和背板之间的距离较远，使得直下式显示器的厚度无法做到极致的薄。
发明内容
本申请实施例的目的在于：提供一种直下式背光模组、液晶显示屏及终端设备，其无需设置支撑柱支撑扩散板，背光效果和显示效果均较好，且扩散板与背板之间的距离较小，整体厚度较薄。
为达此目的，本申请实施例采用以下技术方案：
第一方面，提供一种直下式背光模组，包括背板、扩散板和PCB板，所述背板与所述扩散板间隔设置，所述PCB板设置在所述背板靠近所述扩散板的一侧，所述PCB板上设有光源，所述光源的表面与所述扩散板抵接。
作为直下式背光模组的一种优选方案，所述光源的表面凸出设置有至少一个支撑凸部，所述支撑凸部与所述扩散板抵接。
作为直下式背光模组的一种优选方案，所述光源的表面沿所述光源的中心环形分布有至少三个所述支撑凸部。
作为直下式背光模组的一种优选方案，所述光源为LED灯珠，多个所述LED灯珠均匀分布在所述PCB板上。
作为直下式背光模组的一种优选方案，所述背板为平面板材结构，所述背板的周部设置有内框，所述内框具有相对设置的第一侧面和第二侧面，所述扩散板的边缘设置在所述第一侧面上，所述第二侧面与所述背板抵接。
作为直下式背光模组的一种优选方案，所述内框上连接有压膜件，所述扩散板远离所述光源的一侧设置有光学膜片，所述压膜件包括与所述第一侧面平行且间隔设置的压膜板，所述扩散板和所述光学膜片设置在所述压膜板和所述第一侧面之间。
作为直下式背光模组的一种优选方案，所述第一侧面上凸出设置有悬挂 柱，所述光学膜片上开设有与所述悬挂柱插接配合的悬挂孔。
作为直下式背光模组的一种优选方案，所述压膜件还包括连接板和安装板，所述安装板垂直连接在所述连接板的一端，所述压膜板垂直连接在所述连接板的另一端；
所述内框具有台阶面，所述台阶面与所述第二侧面之间的距离为L1,所述第一侧面与所述第二侧面之间的距离为L2，L2大于L1，所述安装板设置在所述台阶面上。
作为直下式背光模组的一种优选方案，所述压膜板设置在所述连接板靠近所述光学膜片的中心的一侧，所述安装板设置在所述连接板背离所述光学膜片的中心的一侧。
作为直下式背光模组的一种优选方案，所述光学膜片远离所述扩散板的一侧依次设置OC和玻璃盖板，所述玻璃盖板的周部设置有外框，所述外框包括本体，所述本体靠近所述玻璃盖板的一侧凸设有支撑台，所述支撑台用于支撑所述玻璃盖板。
作为直下式背光模组的一种优选方案，所述支撑台上设置有支撑架，所述支撑架远离所述支撑台的一侧通过粘胶层粘接所述玻璃盖板。
作为直下式背光模组的一种优选方案，所述压膜件还包括连接板和安装板，所述压膜板和所述安装板分别设置在所述连接板相对的两侧，所述支撑台远离所述玻璃盖板的一侧抵接在所述安装板远离所述内框的一侧面。
作为直下式背光模组的一种优选方案，所述本体遮挡所述玻璃盖板的边缘、所述背板的边缘以及所述玻璃盖板与所述背板之间的区域，且所述本体靠近所述支撑台的一侧面与所述背板的边缘抵接。
作为直下式背光模组的一种优选方案，所述本体为板状结构，所述本体的 厚度方向沿平行于所述玻璃盖板的方向设置。
第二方面，提供一种液晶显示屏，包括所述的直下式背光模组。
第三方面，提供一种终端设备，包括所述的直下式背光模组。
本申请实施例的有益效果为：通过将光源的表面直接与扩散板抵接，可以利用光源作为扩散板的支撑结构支撑扩散板，省去了支撑柱的使用，提升了背光和显示效果，并且扩散板与背板之间的间距仅为PCB板和光源的厚度之和，极大地缩小了直下式背光模组的整体厚度。
附图说明
下面根据附图和实施例对本申请作进一步详细说明。
图1为本申请实施例的直下式背光模组的剖视示意图。
图中：
1、背板；2、扩散板；3、PCB板；4、LED灯珠；41、支撑凸部；5、内框；51、第一侧面；52、第二侧面；53、台阶面；6、压膜件；61、压膜板；62、连接板；63、安装板；7、光学膜片；8、悬挂柱；9、OC；10、玻璃盖板；11、外框；111、本体；112、支撑台；12、支撑架；13、触摸层。
具体实施方式
为使本申请解决的技术问题、采用的技术方案和达到的技术效果更加清楚，下面将结合附图对本申请实施例的技术方案作进一步的详细描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
在本申请的描述中，除非另有明确的规定和限定，术语“相连”、“连接”、“固定”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，可以具体情况理解上述术语在本申请中的具体含义。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
如图1所示，本申请实施例公开一种直下式背光模组，包括背板1和依次设置在背板1一侧的扩散板2、光学膜片7、OC9(液晶面板)和玻璃盖板10，其中，背板1与扩散板2间隔设置，背板1靠近扩散板2的一侧设置有PCB板3，PCB板3上设置有光源，光源的表面与所述扩散板2抵接。通过将光源的表面直接与扩散板2抵接，可以利用光源作为扩散板2的支撑结构支撑扩散板2，省去了支撑柱的使用，提升了背光和显示效果，并且扩散板2与背板1之间的间距仅为PCB板3和光源的厚度之和，极大地缩小了直下式背光模组的整体厚度。
具体地，光源为LED灯珠4，LED灯珠4具有注塑成型的外壳，外壳透光，扩散板2可以直接抵接在外壳的表面。注塑成型的外壳不易被扩散板2压坏，使用寿命长。
在PCB板3上均匀分布有多个LED灯珠4，均匀分布的LED灯珠4可以为扩散板2提供一个平稳的支撑平面。
进一步地，所述LED灯珠4的表面凸出设置有至少一个支撑凸部41，所述支撑凸部41与所述扩散板2抵接。通过设置支撑凸部41，可以减少LED灯珠4与扩散板2接触的面积，避免LED灯珠4的热量传递过多到扩散板2上。
为了提高支撑过程的平稳度，所述LED灯珠4的表面沿所述LED灯珠4的中心环形分布有至少三个所述支撑凸部41。具体地，所述LED灯珠4的表面沿所述LED灯珠4的中心环形分布有四个所述支撑凸部41。
一实施例中，所述背板1为平面板材结构，所述背板1的周部设置有内框5，所述内框5具有相对设置的第一侧面51和第二侧面52，所述扩散板2的边缘设置在所述第一侧面51上，所述第二侧面52与所述背板1抵接。通过将背板1设置为平面板材结构，可以降低背板1的制造难度，背板1不再需要设置模具冲压或者折弯等操作，直接采用直板下料即可，极大地降低了制造成本，提升了生产效率；通过设置内框5，可以对扩散板2的边缘进行支撑，减少施加在LED灯珠4上的压力，保护LED灯珠4不被压坏。
具体地，内框5通过螺钉与背板1连接。在其他实施例中，还可以采用其他连接方式连接内框5和背板1，比如采用粘接的方式等。
在本实施例中，所述内框5上连接有压膜件6，所述压膜件6包括与所述第一侧面51平行且间隔设置的压膜板61，所述扩散板2和所述光学膜片7设置在所述压膜板61和所述第一侧面51之间。通过设置压膜件6，可以将光学膜片7压紧在扩散板2上，防止光学膜片7移位。优选地，压膜件6可以通过螺钉与内框5连接。在其他实施例中，还可以采用其他连接方式连接压膜件6和内框5，比如采用粘接的方式等。
具体地，在压膜板61靠近光学膜片7的一侧设置有泡棉，泡棉抵压在光学膜片7上。泡棉可以防止光学膜片7与刚性的压膜板61直接接触，避免光学膜片7损坏，另外，压膜板61结合泡棉的方式压紧光学膜片7，还可以为光学膜片7的膨胀提供缓冲空间，防止光学膜片7在膨胀后出现起皱的现象。
进一步地，所述第一侧面51上凸出设置有悬挂柱8，所述光学膜片7上开设有与所述悬挂柱8插接配合的悬挂孔。光学膜片7的边缘可以凸设有多个挂耳，在挂耳上开设有此悬挂孔。
所述压膜件6还包括连接板62和安装板63，所述安装板63垂直连接在所述连接板62的一端，所述压膜板61垂直连接在所述连接板62的另一端，所述内框5具有台阶面53，所述台阶面53与所述第二侧面52之间的距离为L1,所述第一侧面51与所述第二侧面52之间的距离为L2，L2大于L1，所述安装板63设置在所述台阶面53上。
所述压膜板61设置在所述连接板62靠近所述光学膜片7的中心的一侧，所述安装板63设置在所述连接板62背离所述光学膜片7的中心的一侧。即压膜件6的截面结构为Z字型，此结构的压膜件6便于与内框5连接，同时也不会占用内框5与扩散板2之间的空间，便于扩散板2与LED灯珠4的表面抵接。当然，压膜件6的截面结构不限于为Z字型，还可以为U字型、L型等结构。
所述玻璃盖板10的周部设置有外框11，所述外框11包括本体111，所述本体111靠近所述玻璃盖板10的一侧凸设有支撑台112，所述支撑台112用于支撑所述玻璃盖板10。
进一步地，所述支撑台112上设置有支撑架12，所述支撑架12远离所述支撑台112的一侧通过粘胶层粘接所述玻璃盖板10。通过设置支撑架12，可以对玻璃盖板10进行支撑，并且在制作外框11时，可以减少支撑台112的厚度， 降低外框11的重量和成本。
在本实施例中，支撑架12为条状结构，其长度沿外框11的长度方向延伸，支撑架12通过螺钉固定在支撑台112上。支撑架12采用铝合金制成，可以降低支撑架12的重量，进而降低整个背光显示模组的重量。
所述支撑台112远离所述玻璃盖板10的一侧抵接在所述安装板63远离所述内框5的一侧面。具体地，支撑台112通过螺钉与压膜件6的压膜板61连接，而压膜件6通过螺钉与内框5连接，内框5通过螺钉与背板1连接，支撑台112、压膜件6、内框5和背板1通过同一个螺钉固定，可以减少螺钉的使用数量。在其他实施例中，还可以采用不同的螺钉分别固定。
一实施例中，所述本体111遮挡所述玻璃盖板10的边缘、所述背板1的边缘以及所述玻璃盖板10与所述背板1之间的区域，且所述本体111靠近所述支撑台112的一侧面与所述背板1的边缘抵接。
具体地，所述本体111为板状结构，所述本体111的厚度方向沿平行于所述玻璃盖板10的方向设置。通过将本体111设置为板状结构，可以形成超窄的边框结构，即外露在玻璃盖板10的显示侧的本体111的面积较少，实现超窄边框结构。
优选地，本体111背离支撑台112的一侧面为外凸的弧形面。
本申请实施例还提供一种液晶显示屏，包括如上任意实施例的直下式背光模组，具体的直下式背光模组的结构此处不再赘述。
本申请实施例还提供一种终端设备，包括如上任意实施例的直下式背光模组，具体的直下式背光模组的结构此处不再赘述。
终端设备可以为智能交互平板等设备，智能交互平板如会议机，其集电脑、投影仪、电子白板、电视、广告机和音响于一体，具备书写、批注、同步交互、 多媒体、远程视频会议等功能，融合高清显示、人机交互、多媒体信息处理和网络传输等多项技术，常用于政企会议室、媒体演播厅、教育培训机构等地方。
如图1所示，智能交互平板的玻璃盖板10与OC9之间还设置有触摸层13，用于实现触摸、书写等功能。
于本文的描述中，需要理解的是，术语“上”等方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述和简化操作，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
在本说明书的描述中，参考术语“一实施例”等的描述意指结合该实施例的具体特征、结构、材料或者特点包含于本申请的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例。
此外，应当理解，虽然本说明书按照实施方式加以描述，但并非每个实施方式仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以适当组合，形成本领域技术人员可以理解的其他实施方式。
以上结合具体实施例描述了本申请的技术原理。这些描述只是为了解释本申请的原理，而不能以任何方式解释为对本申请保护范围的限制。基于此处的解释，本领域的技术人员不需要付出创造性的劳动即可联想到本申请的其它具体实施方式，这些方式都将落入本申请的保护范围之内。

Claims (16)

  1. 一种直下式背光模组，包括背板、扩散板和PCB板，其中，所述背板与所述扩散板间隔设置，所述PCB板设置在所述背板靠近所述扩散板的一侧，所述PCB板上设有光源，所述光源的表面与所述扩散板抵接。
  2. 根据权利要求1所述的直下式背光模组，其中，所述光源的表面凸出设置有至少一个支撑凸部，所述支撑凸部与所述扩散板抵接。
  3. 根据权利要求2所述的直下式背光模组，其中，所述光源的表面沿所述光源的中心环形分布有至少三个所述支撑凸部。
  4. 根据权利要求1所述的直下式背光模组，其中，所述光源为LED灯珠，多个所述LED灯珠均匀分布在所述PCB板上。
  5. 根据权利要求1至4任一项所述的直下式背光模组，其中，所述背板为平面板材结构，所述背板的周部设置有内框，所述内框具有相对设置的第一侧面和第二侧面，所述扩散板的边缘设置在所述第一侧面上，所述第二侧面与所述背板抵接。
  6. 根据权利要求5所述的直下式背光模组，其中，所述内框上连接有压膜件，所述扩散板远离所述光源的一侧设置有光学膜片，所述压膜件包括与所述第一侧面平行且间隔设置的压膜板，所述扩散板和所述光学膜片设置在所述压膜板和所述第一侧面之间。
  7. 根据权利要求6所述的直下式背光模组，其中，所述第一侧面上凸出设置有悬挂柱，所述光学膜片上开设有与所述悬挂柱插接配合的悬挂孔。
  8. 根据权利要求6所述的直下式背光模组，其中，所述压膜件还包括连接板和安装板，所述安装板垂直连接在所述连接板的一端，所述压膜板垂直连接在所述连接板的另一端；
    所述内框具有台阶面，所述台阶面与所述第二侧面之间的距离为L1,所述第一侧面与所述第二侧面之间的距离为L2，L2大于L1，所述安装板设置在所述台阶面上。
  9. 根据权利要求8所述的直下式背光模组，其中，所述压膜板设置在所述连接板靠近所述光学膜片的中心的一侧，所述安装板设置在所述连接板背离所述光学膜片的中心的一侧。
  10. 根据权利要求6所述的直下式背光模组，其中，所述光学膜片远离所述扩散板的一侧依次设置OC和玻璃盖板，所述玻璃盖板的周部设置有外框，所述外框包括本体，所述本体靠近所述玻璃盖板的一侧凸设有支撑台，所述支撑台用于支撑所述玻璃盖板。
  11. 根据权利要求10所述的直下式背光模组，其中，所述支撑台上设置有支撑架，所述支撑架远离所述支撑台的一侧通过粘胶层粘接所述玻璃盖板。
  12. 根据权利要求10所述的直下式背光模组，其中，所述压膜件还包括连接板和安装板，所述压膜板和所述安装板分别设置在所述连接板相对的两侧，所述支撑台远离所述玻璃盖板的一侧抵接在所述安装板远离所述内框的一侧面。
  13. 根据权利要求10所述的直下式背光模组，其中，所述本体遮挡所述玻璃盖板的边缘、所述背板的边缘以及所述玻璃盖板与所述背板之间的区域，且所述本体靠近所述支撑台的一侧面与所述背板的边缘抵接。
  14. 根据权利要求13所述的直下式背光模组，其中，所述本体为板状结构，所述本体的厚度方向沿平行于所述玻璃盖板的方向设置。
  15. 一种液晶显示屏，其中，包括权利要求1至14任一项所述的直下式背光模组。
  16. 一种终端设备，其中，包括权利要求1至14任一项所述的直下式背光模组。
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