WO2021000869A1 - 背光模组及显示面板 - Google Patents

背光模组及显示面板 Download PDF

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Publication number
WO2021000869A1
WO2021000869A1 PCT/CN2020/099470 CN2020099470W WO2021000869A1 WO 2021000869 A1 WO2021000869 A1 WO 2021000869A1 CN 2020099470 W CN2020099470 W CN 2020099470W WO 2021000869 A1 WO2021000869 A1 WO 2021000869A1
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WO
WIPO (PCT)
Prior art keywords
plate
bottom plate
backlight module
light
optical film
Prior art date
Application number
PCT/CN2020/099470
Other languages
English (en)
French (fr)
Inventor
李文洋
韩锐
崔栋
佟泽源
马青
冷寿阳
关冬
王丰平
迟卫宁
张志鹏
翟跃
张赞
王遥遥
王晓霞
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 北京京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US17/254,570 priority Critical patent/US11262496B2/en
Publication of WO2021000869A1 publication Critical patent/WO2021000869A1/zh

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Classifications

    • 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
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/009—Positioning aspects of the light source in the package
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED

Definitions

  • the present disclosure relates to the field of display technology, and in particular to a backlight module and a display panel.
  • liquid crystal display panels are increasingly used in various technical fields.
  • liquid crystal display panels can be used in vehicle-mounted instruments and central control display devices.
  • the liquid crystal display panel is required to be flexible; however, the structure of the backlight module in the liquid crystal display panel is complicated, which results in the backlight module being thick and costly. Higher, and not conducive to bending.
  • the light-emitting component is easily squeezed during the bending process of the liquid crystal display panel, which causes the light-emitting component to be easily damaged and reduces the product yield.
  • the present disclosure provides a backlight module and a display panel.
  • An aspect of the present disclosure provides a backlight module, including:
  • the back plate includes a bottom plate and a first side plate and a second side plate extending from the surface of the bottom plate in a direction away from the bottom plate.
  • the first side plate and the second side plate are arranged on the bottom plate. Two opposite sides in the first direction, and the first side plate and the second side plate both have support parts protruding toward the inner side of the back plate;
  • the optical film material is arranged on the side of the support part away from the bottom plate, and opposite ends of the optical film material are supported on the support part;
  • the light-emitting component is arranged on the bottom plate and is located on the side of the support portion facing the bottom plate, and the light-emitting direction of the light-emitting component faces the optical film material.
  • the first side plate and the second side plate each include an integrally formed vertical plate and a bent plate, wherein:
  • the vertical plate has one end connected to the bottom plate and extends in a direction away from the bottom plate;
  • the bent plate has one end connected to the bottom plate, and is bent toward the inner side of the back plate to form the support portion.
  • the bent plate includes a first part and a second part, the first part has an end connected to the bottom plate and extends in a direction away from the bottom plate, and the second part has One end connected to the other end of the first portion in the extending direction of the first portion and extends toward the inner side of the back plate to form the support portion.
  • the distance between the other end of the vertical plate in the extending direction of the vertical plate and the bottom plate is greater than the distance between the surface of the support portion facing away from the bottom plate and the bottom plate. The distance between the bottom plates.
  • each of the first side plate and the second side plate includes a plurality of vertical plates and a plurality of bent plates arranged alternately.
  • the back plate further includes a first auxiliary support plate and a second auxiliary support plate, and the first auxiliary support plate and the second auxiliary support plate are arranged on the bottom plate at the second On opposite sides of the direction, the second direction and the first direction are perpendicular to each other; and
  • the first auxiliary support plate and the second auxiliary support plate each include a connecting part and an auxiliary support part.
  • One end of the connecting part is connected to the bottom plate and extends in a direction away from the bottom plate.
  • the auxiliary support A portion having one end connected to the other end of the connecting portion in the extending direction of the connecting portion and extending toward the inner side of the back plate;
  • the surface of the auxiliary support portion facing away from the bottom plate and the surface of the support portion facing away from the bottom plate are located on the same plane.
  • the auxiliary support portion and the support portion have the same thickness in a direction perpendicular to the surface of the bottom plate.
  • the distance between the optical film material and the light-emitting component is 2.5 mm.
  • the backlight module further includes:
  • the transparent support plate is arranged on the support part and is located on the side of the optical film facing the support part.
  • the optical film material includes a quantum dot film, a diffusion film, a prism film, and a reflective polarizer that are sequentially stacked on the support portion.
  • the light-emitting component includes a circuit board and a plurality of light-emitting diodes, the circuit board is disposed on the bottom plate, and each of the light-emitting diodes is disposed on the circuit board away from the bottom plate. One side.
  • the optical film material is arranged in the first direction between the vertical plate of the first side plate and the vertical plate of the second side plate. between.
  • a display panel including a display module, wherein the display module includes:
  • the display screen is arranged on the side of the optical film away from the support part.
  • the display module further includes:
  • the edging tape includes a top edging tape and a bottom edging tape that are arranged oppositely, and a side edging tape connecting the top edging tape and the bottom edging tape, and the top edging tape is adhered to the On the top edge of the display screen, the bottom edging tape is adhered to the bottom edge of the bottom plate, and the side edging tape is adhered to the sides of the display screen and the backlight module.
  • the display panel further includes a curved module housing, the display module is installed in the module housing, and the shape of the display module is consistent with that of the module housing Match the shape.
  • the surface of the display screen away from the bottom plate and the end surfaces of the first side plate and the second side plate away from the bottom plate are on the same plane.
  • Figure 1 shows a schematic structural diagram of a display module according to an embodiment of the present disclosure
  • FIG. 2 shows a schematic structural diagram of a back plate in a backlight module according to an embodiment of the present disclosure
  • FIG. 3 shows a schematic structural diagram of a first auxiliary supporting plate (second auxiliary supporting plate) in a backlight module of an embodiment of the present disclosure
  • FIG. 4 shows a schematic structural diagram of a display panel according to an embodiment of the present disclosure
  • FIG. 5 shows a schematic structural diagram of a module housing in a display panel according to an embodiment of the present disclosure.
  • a liquid crystal display panel usually includes a liquid crystal display and a backlight module arranged on the back of the liquid crystal display.
  • the backlight module is used to provide a light source for the liquid crystal display.
  • the traditional backlight module usually includes a backplane, light-emitting components, light guide plates, optical film materials, middle frame and top cover and other structures.
  • the backplane, middle frame and top cover are used to realize light-emitting components, light guide plates and optical film materials. Fixed. Because there are many parts in the traditional module, the structure is more complicated; therefore, the backlight module is thicker, more expensive, and not conducive to bending.
  • the light-emitting component is easily squeezed during the bending process of the liquid crystal display panel, which causes the light-emitting component to be easily damaged and reduces the product yield.
  • the embodiments of the present disclosure propose a backlight module that can be applied to a display panel.
  • the backlight module may include a back plate 10, an optical film 11, and a light-emitting component.
  • the back plate 10 may include a bottom plate 100, a first side plate 101a, and a second side plate 101b.
  • the first side plate 101a and the second side plate 101b are disposed on opposite sides of the bottom plate 100 in the first direction X, and Both the one side plate 101a and the second side plate 101b have a supporting part 1010 protruding to the inner side of the back plate 2; the optical film 11 can be arranged on the side of the supporting part 1010 away from the bottom plate 100, and opposite ends of the optical film 11 Supported on the supporting portion 1010; and the light emitting component 12 can be disposed on the bottom plate 100 and located on the side of the supporting portion 1010 facing the bottom plate 100, and the light emitting direction of the light emitting component 12 can face the optical film 11.
  • the first direction X is parallel to the plane where the bottom plate 100 is located and parallel to one side of the bottom plate 100.
  • the orthographic projection of the bottom plate 100 on the plane on which it is located may be a rectangle.
  • the first direction X may be parallel to the long side of the rectangle.
  • the first side plate 101a and the second side plate 101b are respectively disposed along the edges of the bottom plate 100, that is, are respectively disposed along the two opposite edges of the bottom plate 100 in the first direction X.
  • the two outer side surfaces of the first side plate 101a and the second side plate 101b that are not opposite to each other in the first direction X are flush with the two side surfaces of the bottom plate 100 opposite to each other in the first direction X, respectively.
  • the supporting portion 1010 in order to enable the light emitted by the light-emitting component 12 to propagate smoothly to the optical film 11, the supporting portion 1010 should be set relatively short, and the position of the supporting portion 1010 should avoid developing the light-emitting area of the light component 12 to The influence of the supporting portion 1010 on light propagation is alleviated; in other words, the protruding length of the supporting portion 1010 only needs to be able to support the optical film 11, and it is not easy to be too long.
  • the back plate 2 can be an integrated structure to ensure the overall structural strength of the back plate 2.
  • the backlight module of the present disclosure can be compared with the traditional backlight module. Save the middle frame, top cover and light guide plate, simplify the structure of the backlight module, reduce the weight and cost of the backlight module, and reduce the thickness of the backlight module; and the thickness of the backlight module is reduced Therefore, it is easier for the display panel with the backlight module to achieve a curved surface effect by cold bending.
  • the optical film material 11 and the light-emitting component 12 of this embodiment are respectively arranged on both sides of the support part 1010. Due to the existence of the support part 1010, a gap is formed between the optical film material 11 and the light-emitting part 12, which can relieve the optical film.
  • the material 11 squeezes the light-emitting component 12 during the bending process, so that the light-emitting component 12 is easily damaged and the product yield is improved.
  • the back plate 10 can be made of aluminum plate material, so that while ensuring the structural strength of the back plate 10, it can also reduce the weight of the back plate 10; but it should be understood that the back plate 10 is not limited to using aluminum plate material It can also be made of other materials.
  • the thickness of each part of the back plate 10 is about 0.5 mm, so as to ensure the structural strength of the back plate 10 while facilitating the bending of the back plate 10 (especially the bottom plate 100 in the back plate 10); but it should be understood
  • the thickness of each part of the back plate 10 is not limited to this, and other thickness values can also be selected according to specific conditions.
  • the first side plate 101a and the second side plate 101b in the back plate 10 may each include an integrally formed vertical plate and a bent plate, wherein: vertical plate It has one end connected to the bottom plate 100 and extends in a direction away from the bottom plate 100; the bent plate has one end connected to the bottom plate 100 and is bent toward the inner side of the back plate 2 to form a supporting portion 1010. That is to say, the supporting portion 1010 in this embodiment is formed by bending part of the structure of the first side plate 101a and the second side plate 101b. This design ensures that the first side plate 101a and the second side plate 101b With the supporting portion 1010, the weight of the first side plate 101a and the second side plate 101b can be reduced, so that the backlight module is lighter and thinner.
  • the bent plate includes a first part and a second part.
  • the first part has an end connected to the bottom plate 100 and extends in a direction away from the bottom plate 100
  • the second part has a part connected to the first part.
  • One end at the other end in the extending direction thereof extends toward the inner side of the back plate 10 to form a supporting portion 1010.
  • the distance between the other end of the vertical plate in the extending direction and the bottom plate 100 is greater than the distance between the surface of the support portion 1010 facing away from the bottom plate 100 and the bottom plate 100, so that the vertical plate can limit the optical film 11 .
  • first side plate 101a and the second side plate 101b not only support the optical film material 11, but can also limit the position of the optical film material 11 through the vertical plate, that is, in the optical film material While 11 is supported on the supporting portion 1010, the optical film 11 is also confined between the vertical plates of the first side plate 101a and the second side plate 101b, and the vertical plate of the first side plate 101a and the second side
  • the vertical plate of the plate 101b can restrict the optical film material 11 from moving in the first direction X with a relatively large amplitude.
  • the optical film material 11 since the optical film material 11 may expand when heated, in order to adapt to the expansion of the optical film material 11, the optical film material 11 and the vertical plates of the first side plate 101a and the second side plate 101b should be preset. Leave a gap.
  • first side plate 101a and the second side plate 101b there may be multiple vertical plates and bent plates in the first side plate 101a and the second side plate 101b, and the vertical plates and the bent plates may be alternately arranged, so as to ensure the support of the optical film 11 At the same time of stability, the uniformity of the forces on the first side plate 101a and the second side plate 101b can be ensured, thereby ensuring the structural strength of the first side plate 101a and the second side plate 101b.
  • this thickness direction Z is perpendicular to the first direction X and the second direction Y at the same time
  • the support portions 1010 of the first side plate 101a and the second side plate 101b and the light emitting component 12 There is a gap therebetween, which can relieve the support 1010 from squeezing the light-emitting component 12 during the bending process of the backlight module, thereby reducing the easy damage of the light-emitting component 12 and improving the product yield.
  • the back plate 10 may further include a first auxiliary support plate 13a and a second auxiliary support plate 13b, and a first auxiliary support plate 13a and a second auxiliary support plate 13a.
  • the supporting plates 13b are disposed on opposite sides of the bottom plate 100 in the second direction Y.
  • the second direction Y and the first direction X are perpendicular to each other.
  • the first auxiliary support plate 13a and the second auxiliary support plate 13b may each include a connecting portion 130 and an auxiliary support portion 131.
  • the connecting portion 130 has one end connected to the bottom plate 100 and is facing away from each other.
  • the bottom plate 100 extends in the direction
  • the auxiliary support portion 131 has one end connected to the other end of the connecting portion 130 in the extending direction thereof and extends toward the inner side of the back plate 10 for supporting the optical film 11.
  • the surface of the auxiliary supporting part 131 facing away from the base plate 100 can be the same as the supporting part 1010.
  • the upper surface facing away from the bottom plate 100 is on the same plane.
  • the thickness of the auxiliary support portion 131 may be the same as the thickness of the support portion 1010 to ensure that the distance between the auxiliary support portion 131 and the light emitting component 12 and the distance between the support portion 1010 and the light emitting component 12 are specifically the same.
  • the distance between the optical film 11 and the light-emitting component 12 can be 2.5 mm, which can ensure that the display panel with the backlight module has no light shadow during normal display, thereby improving the display effect.
  • the light emitting component 12 may include a circuit board and a plurality of light emitting diodes.
  • the circuit board is arranged on the bottom plate 100; for example, the circuit board may be a flexible printed circuit board (Flexible Printed Circuit Board; abbreviated as FPC substrate), so that the circuit board can be applied to a bent state; and the circuit board can be
  • the heat dissipation glue 17 (for example, 3M8805, Teraoka 7092 and other glue materials) is used to adhere to the bottom plate 100.
  • Each light-emitting diode can be arranged on the side of the circuit board away from the bottom plate 100.
  • the light-emitting diode can be a Mini LED (mini light-emitting diode) with a size of about 100 microns to reduce the thickness of the backlight module, so that the backlight module
  • Mini LED mini light-emitting diode
  • the display panel is easier to achieve a curved surface effect by cold bending.
  • the optical film material 11 may include a quantum dot film 110, a diffusion sheet 111, a prism sheet 112 and a reflective polarizer 113 stacked on the supporting portion 1010 in sequence.
  • the quantum dot film 110 in this embodiment can achieve a perfect high-color gamut image quality effect.
  • the principle is to use a high-frequency light source, such as the most commonly used blue light to excite the quantum dot film 110 to generate various color spectra.
  • the quantum dot film 110 may include red, green, and blue quantum dot regions
  • the backlight module may use a light-emitting diode capable of emitting blue light to excite the red, green, and blue quantum dot regions to emit red light, respectively.
  • the diffusion sheet 111 is arranged on the side of the quantum dot film 110 away from the support portion 1010 and can be used to provide a uniform surface light source for the display panel.
  • the prism sheet 112 is disposed on the side of the diffusion sheet 111 away from the support portion 1010 to improve the front brightness of the display panel.
  • the reflective polarizer 113 is arranged on the side of the prism sheet 112 away from the support portion 1010, which can improve the utilization rate of light.
  • the backlight module may further include a transparent supporting plate 14 which is disposed on the supporting portion 1010 and is located
  • the optical film material 11 faces the side of the support portion 1010, that is, a transparent support plate 14 may be provided between the optical film material 11 and the support portion 1010.
  • the transparent support plate 14 can be made of materials such as polymethyl methacrylate (organic glass), but is not limited thereto. And the thickness of the transparent support plate 14 can be 1.5mm, so that while ensuring the structural strength of the transparent support plate 14, it can also ensure that the distance between the optical film 11 and the light-emitting component 12 meets the target value to ensure the backlight
  • the display panel of the module has no light shadow during normal display, which improves the display effect.
  • the embodiments of the present disclosure also provide a display panel, which may be a liquid crystal display panel.
  • the display panel may include a display module 1 which can be flexible.
  • the display module 1 may include a backlight module, a display screen 15 and an edging tape 16. specifically:
  • the backlight module can be the backlight module described in any of the foregoing embodiments, and will not be described in detail here.
  • the display screen 15 can be a liquid crystal display screen 15.
  • the display screen 15 can be arranged on the side of the optical film 11 away from the support 1010, and the light emitted by the light-emitting component 12 in the backlight module can reach the display 15 through the optical film 11
  • the display screen 15 can be located between the first side panel 101a and the second side panel 101b, and the first side panel 101a and the second side panel 101b can limit the display screen 15.
  • the top surface of the display screen 15 can be flush with the top surfaces of the first side plate 101a and the second side plate 101b to facilitate subsequent edge wrapping.
  • the edging tape 16 may include a top edging tape 160 and a bottom edging tape 161 that are arranged oppositely, and a side edging tape 162 connecting the top edging tape 160 and the bottom edging tape 161.
  • the top edging tape 160 is adhered to On the top edge of the display screen 15 (ie: the edge portion of the top surface in the display screen 15), the bottom wrapping tape 161 is adhered to the bottom edge of the bottom plate 100 (ie: the edge portion of the bottom surface in the bottom plate 100), and the side wrapping tape 162 is bonded to the sides of the display screen 15 and the backlight module.
  • the edging tape 16 can encapsulate the display 15 and the backlight module, and realize the fixation of the display 15 and the backlight module.
  • the display panel may further include a curved module housing 2.
  • the module housing 2 may be made of acrylic (also known as organic glass) material, but is not limited to this; wherein, the aforementioned display module 1 may It is installed in the module housing 2 and the shape of the display module 1 matches the shape of the module housing 2, that is, the entire display panel can be curved.
  • the display module 1 since the display module 1 has the characteristic of being bendable, after the aforementioned display module 1 is formed, the display module 1 can be bent into a shape matching the shape of the module housing 2 by cold bending. Then the bent display module 1 is installed in the module housing 2. Wherein, the display module 1 and the module housing 2 can be fixed by double-sided adhesive tape (for example, 3M VHB type tape).

Abstract

一种背光模组及显示面板。背光模组包括背板（10）、光学膜材（11）及发光部件（12），背板（10）包括底板（100）、第一侧板（101a）及第二侧板（101b），第一侧板（101a）和第二侧板（101b）设置于底板（100）在第一方向上的相对两侧，且第一侧板（101a）和第二侧板（101b）均具有向背板（10）的内侧凸出的支撑部（1010）；光学膜材（11）设置在支撑部（1010）背离底板（100）的一侧，且光学膜材（11）的相对两端支撑在支撑部（1010）上；发光部件（12）设置在底板（100）上并位于支撑部（1010）朝向底板（100）的一侧，且发光部件（12）的出光方向朝向光学膜材（11）。

Description

背光模组及显示面板
交叉引用
本申请要求于2019年7月4日提交的申请号为201921033149.4、实用新型名称为“背光模组及显示面板”的中国实用新型申请的优先权，该中国实用新型申请的全部内容通过引用全部并入本文。
技术领域
本公开涉及显示技术领域，具体而言，涉及一种背光模组及显示面板。
背景技术
随着液晶显示技术的快速发展，液晶显示面板越来越多地应用于各种技术领域，例如，液晶显示面板可以用于车载仪表和中控显示装置上。其中，为了节省车载仪表和中控显示装置在整车中的空间，要求液晶显示面板具有可弯曲等特点；但由于液晶显示面板中背光模组的结构较复杂，导致背光模组较厚，成本较高，且不利于弯曲。此外，在液晶显示面板弯曲过程中容易挤压到发光部件，从而导致发光部件容易损坏，降低了产品良率。
需要说明的是，在上述背景技术部分公开的信息仅用于加强对本公开的背景的理解，因此可以包括不构成对本领域普通技术人员已知的现有技术的信息。
发明内容
本公开提供一种背光模组及显示面板。
本公开的一方面提供了一种背光模组，包括：
背板，包括底板以及从所述底板的表面沿背离所述底板的方向延伸的第一侧板及第二侧板，所述第一侧板和所述第二侧板设置于所述底板在第一方向上的相对两侧，且所述第一侧板和所述第二侧板均具有向所述背板的内侧凸出的支撑部；
光学膜材，设置在所述支撑部背离所述底板的一侧，且所述光学膜材的相对两端支撑在所述支撑部上；
发光部件，设置在所述底板上并位于所述支撑部朝向所述底板的一侧，且所述发光部件的出光方向朝向所述光学膜材。
在本公开的一些实施例中，所述第一侧板和所述第二侧板均包括一体式成型的竖直板和弯折板，其中：
所述竖直板具有与所述底板连接的一端，并沿背离所述底板的方向延伸；
所述弯折板具有与所述底板连接的一端，并向所述背板的内侧弯折以形成所述支撑部。
在本公开的一些实施例中，所述弯折板包括第一部分和第二部分，所述第一部分具有与所述底板连接的一端并沿背离所述底板的方向延伸，所述第二部分具有连接至所述第一部分的在所述第一部分的延伸方向上的另一端的一端并向所述背板的内侧延伸以形成所述支撑部。
在本公开的一些实施例中，所述竖直板的在所述竖直板的延伸方向上的另一端与所述底板之间的距离大于所述支撑部的背离所述底板的表面与所述底板之间的距离。
在本公开的一些实施例中，所述第一侧板和所述第二侧板均包括交替设置的多个竖直板和多个弯折板。
在本公开的一些实施例中，所述背板还包括第一辅助支撑板和第二辅助支撑板，所述第一辅助支撑板和所述第二辅助支撑板设置于所述底板在第二方向上的相对两侧，所述第二方向与所述第一方向相互垂直；以及
所述第一辅助支撑板和所述第二辅助支撑板均包括连接部和辅助支撑部，所述连接部的一端与所述底板连接，并沿背离所述底板的方向延伸，所述辅助支撑部具有连接至所述连接部的在所述连接部的延伸方向上的另一端的一端并向所述背板的内侧延伸；
其中，所述辅助支撑部背离所述底板的表面与所述支撑部背离所述底板的表面位于同一平面上。
在本公开的一些实施例中，所述辅助支撑部和所述支撑部在垂直于所述底板的表面的方向上具有相同的厚度。
在本公开的一些实施例中，在垂直于所述底板的表面的方向上，所述支撑部与所述发光部件之间具有间隙。
在本公开的一些实施例中，所述光学膜材与所述发光部件之间的距离为2.5mm。
在本公开的一些实施例中，背光模组还包括：
透明支撑板，设置在所述支撑部上，并位于所述光学膜材朝向所述支撑部的一侧。
在本公开的一些实施例中，所述光学膜材包括依次堆叠在所述支撑部上的量子点膜片、扩散片、棱镜片及反射型偏光片。
在本公开的一些实施例中，所述发光部件包括电路板及多个发光二极管，所述电路板设置在所述底板上，且各所述发光二极管设置在所述电路板背离所述底板的一侧。
在本公开的一些实施例中，所述光学膜材设置在所述第一方向上设置在所述第一侧板的所述竖直板与所述第二侧板的所述竖直板之间。
本公开了另一方面提供了一种显示面板，包括显示模组，其中，所述显示模组包括：
上述任意实施例所述的背光模组；
显示屏，设置在所述光学膜材背离所述支撑部的一侧。
在本公开的一些实施例中，所述显示模组还包括：
包边胶带，包括相对设置的顶包边胶带和底包边胶带、以及连接所述顶包边胶带和所述底包边胶带的侧包边胶带，所述顶包边胶带粘接在所述显示屏的顶边，所述底包边胶带粘接在所述底板的底边，所述侧包边胶带粘接在所述显示屏与所述背光模组的侧面。
在本公开的一些实施例中，显示面板还包括呈弯曲状的模组外壳，所述显示模组安装在所述模组外壳中，且所述显示模组的形状并与所述模组外壳的形状相匹配。
在本公开的一些实施例中，所述显示屏的远离所述底板的表面与所述第一侧板和所述第二侧板的远离所述底板的表面的端表面在同一平面上。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本公开。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本公开的实施例，并与说明书一起用于解释本公开的原理。显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1示出了本公开一实施例的显示模组的结构示意图；
图2示出了本公开一实施例的背光模组中背板的结构示意图；
图3示出了本公开一实施例的背光模组中第一辅助支撑板(第二辅助支撑板)的结构示意图；
图4示出了本公开一实施例的显示面板的结构示意图；
图5示出了本公开一实施例的显示面板中模组外壳的结构示意图。
具体实施方式
现在将参考附图更全面地描述示例实施方式。然而，示例实施方式能够以多种形式实施，且不应被理解为限于在此阐述的实施方式；相反，提供这些实施方式使得本公开将全面和完整，并将示例实施方式的构思全面地传达给本领域的技术人员。图中相同的附图标记表示相同或类似的结构，因而将省略它们的详细描述。
虽然本说明书中使用相对性的用语，例如“上”、“下”来描述图标的一个组件对于另一组件的相对关系，但是这些术语用于本说明书中仅出于描述方便，例如根据附图中所述的示例方向进行描述。能理解的是，如果将图标的装置翻转使其上下颠倒，则所叙述在“上”的组件将会成为在“下”的组件。当某结构在其它结构“上”时， 有可能是指某结构一体形成于其它结构上，或指某结构“直接”设置在其它结构上，或指某结构通过另一结构“间接”设置在其它结构上。
用语“一”、“该”、“所述”用以表示存在一个或多个要素/组成部分/等；用语“包括”和“具有”用以表示开放式的包括在内的意思并且是指除了列出的要素/组成部分/等之外还可存在另外的要素/组成部分/等；用语“第一”、“第二”等仅作为标记使用，不是对其对象的数量限制。
目前，液晶显示面板通常包括液晶显示屏及设置在液晶显示屏背面的背光模组，背光模组用于为液晶显示屏提供光源。其中，传统背光模组通常包括背板、发光部件、导光板、光学膜材、中框及顶盖等结构，该背板、中框及顶盖用于实现发光部件、导光板及光学膜材的固定。由于传统模组中部件较多，结构较复杂；因此，导致背光模组比较厚、成本较高，以及不利于弯曲。此外，在液晶显示面板弯曲过程中容易挤压到发光部件，从而导致发光部件容易损坏，降低了产品良率。
为解决上述技术问题，本公开实施例提出了一种背光模组，可应用于显示面板中，如图1和图2所示，背光模组可包括背板10、光学膜材11及发光部件12。其中，背板10可包括底板100、第一侧板101a及第二侧板101b，第一侧板101a和第二侧板101b设置于底板100在第一方向X上的相对两侧，且第一侧板101a和第二侧板101b均具有向背板2的内侧凸出的支撑部1010；光学膜材11可设置在支撑部1010背离底板100的一侧，且光学膜材11的相对两端支撑在支撑部1010上；而发光部件12可设置在底板100上并位于支撑部1010朝向底板100的一侧，且发光部件12的出光方向可朝向光学膜材11。
在本公开的实施例中，如图1和图2所示，第一方向X平行于底板100所在的平面，并平行于底板100的一边。具体地，底板100在其所在的平面上的正投影可以为矩形，在这种情况下，第一方向X可以平行于该矩形的长边。
在本公开的实施例中，第一侧板101a和第二侧板101b分别沿着底板100的边缘设置，即，分别沿着底板100的在第一方向X上相对的两个边缘设置。另外，第一侧板101a和第二侧板101b的沿第一方向X彼此不相对的两个外侧面分别与底板100的在第一方向X上相对的两个侧面齐平。
应当理解的是，为了使得发光部件12发出的光能够顺利向光学膜材11传播，该支撑部1010应设置的比较短，且该支撑部1010的位置应避开发光部件12的发光区域，以缓解支撑部1010对光传播的影响；换言之，该支撑部1010的凸出长度只需要满足能够支撑光学膜材11即可，不易过长。此外，该背板2可为一体式结构，以保证背板2整体的结构强度。
本实施例中，由于背板2具有支撑光学膜材11的支撑部1010，以及该发光部件12的出光方向朝向光学膜材11，因此，本公开的背光模组相比于传统背光模组可节省中框、顶盖及导光板的设置，简化了背光模组的结构，降低了背光模组的重量及成 本，以及减小了背光模组的厚度；且由于背光模组的厚度减薄了，因此使得具有该背光模组的显示面板更容易通过冷弯的方式实现曲面效果。
此外，本实施例的光学膜材11与发光部件12分别设置在支撑部1010的两侧，由于支撑部1010的存在使得光学膜材11与发光部件12之间形成有间隙，这样可缓解光学膜材11在弯曲过程中挤压发光部件12的情况，从而可缓解发光部件12容易损坏的情况，提高了产品良率。
举例而言，背板10可采用铝板材料制作而成，这样在保证背板10的结构强度的同时，还可减轻背板10的重量；但应当理解的是，背板10不限于采用铝板材料制作而成，也可采用其他材料制作而成。
可选地，背板10中各处的厚度约为0.5mm，以在保证背板10的结构强度的同时，便于实现背板10(尤其是背板10中的底板100)弯曲；但应当理解的是，背板10中各处的厚度不限于此，也可根据具体情况选取其他厚度值。
在一实施例中，如图1和图2所示，背板10中第一侧板101a和第二侧板101b均可包括一体式成型的竖直板和弯折板，其中：竖直板具有与底板100连接的一端，并沿背离底板100的方向延伸；弯折板具有与底板100连接的一端，并向背板2的内侧弯折以形成支撑部1010。也就是说，本实施例中的支撑部1010是通过对第一侧板101a和第二侧板101b的部分结构进行弯折而形成，这样设计在保证第一侧板101a和第二侧板101b具有支撑部1010的同时，还可减轻第一侧板101a和第二侧板101b的重量，使得背光模组更加轻薄化。
具体地，如图1和图2所示，弯折板包括第一部分和第二部分，第一部分具有与底板100连接的一端并沿背离底板100的方向延伸，第二部分具有连接至第一部分的在其延伸方向上的另一端的一端并向背板10的内侧延伸以形成支撑部1010。竖直板的在其延伸方向上的另一端与底板100之间的距离大于支撑部1010的背离底板100的表面与底板100之间的距离，从而竖直板可以对光学膜材11进行限位。
应当理解的是，该第一侧板101a和第二侧板101b不仅对光学膜材11具有支撑作用，还可通过竖直板对光学膜材11起到限位作用，即：在光学膜材11支撑在支撑部1010上的同时，该光学膜材11还限制在第一侧板101a和第二侧板101b的竖直板之间，该第一侧板101a的竖直板和第二侧板101b的竖直板能够限制光学膜材11在第一方向X上具有较大幅度的移动。
此外，由于光学膜材11受热可能会发生膨胀，因此，为了适配光学膜材11的膨胀量，光学膜材11与第一侧板101a和第二侧板101b的竖直板之间应该预留有间隙。
可选地，第一侧板101a和第二侧板101b中竖直板和弯折板可设置有多个，且竖直板和弯折板可交替设置，这样在保证光学膜材11的支撑稳定性的同时，还可保证第一侧板101a和第二侧板101b受力均匀性，从而保证第一侧板101a和第二侧板101b的结构强度。
举例而言，在底板100的厚度方向Z(此厚度方向Z同时垂直于第一方向X和第二方向Y)上，第一侧板101a和第二侧板101b的支撑部1010与发光部件12之间具有间隙，这样可缓解支撑部1010在背光模组的弯曲过程中挤压发光部件12的情况，从而可缓解发光部件12容易损坏的情况，提高了产品良率。
其中，为了保证光学膜材11的支撑稳定性，如图2所示，该背板10还可包括第一辅助支撑板13a和第二辅助支撑板13b，第一辅助支撑板13a和第二辅助支撑板13b设置于底板100在第二方向Y上的相对两侧，需要说明的是，该第二方向Y与第一方向X相互垂直。其中，如图2和图3所示，第一辅助支撑板13a和第二辅助支撑板13b均可包括连接部130和辅助支撑部131，连接部130具有与底板100连接的一端，并沿背离底板100的方向延伸，辅助支撑部131具有连接至连接部130的在其延伸方向上的另一端的一端并向背板10的内侧延伸，用于支撑光学膜材11。
应当理解的是，为了保证辅助支撑部131与第一侧板101a和第二侧板101b的支撑部1010共同支撑光学膜材11，该辅助支撑部131上背离底板100的面可与支撑部1010上背离底板100的面位于同一平面上。更进一步地，辅助支撑部131的厚度可与支撑部1010的厚度相同，以保证辅助支撑部131与发光部件12之间的距离和支撑部1010与发光部件12之间具体相同。
举例而言，光学膜材11与发光部件12之间的距离可为2.5mm，这样可确保具有该背光模组的显示面板在正常显示时没有灯影，提高显示效果。
可选地，发光部件12可包括电路板及多个发光二极管。其中，电路板设置在底板100上；举例而言，此电路板可为柔性电路板(Flexible Printed Circuit Board；简称：FPC基板)，以使得该电路板可适用于弯曲状态；且该电路板可采用散热胶17(例如3M8805，寺冈7092等胶材)粘接在底板100上。而各发光二极管可设置在电路板背离底板100的一侧，该发光二极管可为Mini LED(迷你发光二极管)，其尺寸在100微米左右，以减薄背光模组，使得具有该背光模组的显示面板更容易通过冷弯的方式实现曲面效果。
可选地，如图1所示，光学膜材11可包括依次堆叠在支撑部1010上的量子点膜片110、扩散片111、棱镜片112及反射型偏光片113。本实施例中的量子点膜片110可实现完美高色域画质效果，其原理是采用高频光源，例如最常用的蓝光激发量子点膜片110产生各种色彩光谱。举例而言，该量子点膜片110可包括红色、绿色、蓝色等量子点区域，背光模组可使用能够发出蓝光的发光二极管以激发红色、绿色、蓝色灯量子点区域分别发出红色光、绿色光、蓝色光，该红色光、蓝色光及绿色光混色从而实现白光效果。该扩散片111设置在量子点膜片110背离支撑部1010的一侧，能够用于为显示面板提供一个均匀的面光源。棱镜片112设置在扩散片111背离支撑部1010的一侧，用以提高显示面板的正面亮度。反射型偏光片113设置在棱镜片112背离支撑部1010的一侧，能够提高光的利用率。
由于光学膜材11较薄，且支撑部1010的凸出长度较短，在将光学膜材11的相对两端支撑在支撑部1010上时，该光学膜材11容易从支撑部1010上脱落，因此，为了使得光学膜材11能够稳定地支撑在支撑部1010上，如图1所示，该背光模组还可包括透明支撑板14，此透明支撑板14设置在支撑部1010上，并位于光学膜材11朝向支撑部1010的一侧，也就是说，光学膜材11与支撑部1010之间可设置有透明支撑板14。本实施例中，通过设置透明支撑板14，在使得发光部件12发出的光能够顺利传播至光学膜材11的同时，还可提高光学膜材11的支撑面积，从而可提高光学膜材11的支撑稳定性。
其中，此透明支撑板14可采用聚甲基丙烯酸甲酯(有机玻璃)等材料制作而成，但不限于此。且该透明支撑板14的厚度可为1.5mm，这样在保证透明支撑板14的结构强度的同时，还可保证光学膜材11与发光部件12之间的距离满足目标值，以确保具有该背光模组的显示面板在正常显示时没有灯影，提高显示效果。
本公开实施例还提供了一种显示面板，此显示面板可为液晶显示面板。该显示面板可包括显示模组1，该显示模组1能够具有可弯曲特点。其中，该显示模组1可包括背光模组、显示屏15及包边胶带16。具体地：
背光模组可为前述任一实施例所描述的背光模组，在此不再详细赘述。显示屏15可为液晶显示屏15，该显示屏15可设置在光学膜材11背离支撑部1010的一侧，背光模组中发光部件12发出的光可通过光学膜材11达到显示屏15处；此外，显示屏15可位于第一侧板101a和第二侧板101b之间，该第一侧板101a和第二侧板101b可对显示屏15进行限位。且该显示屏15的顶面可与第一侧板101a和第二侧板101b的顶面平齐，方便后续进行包边。
包边胶带16可包括相对设置的顶包边胶带160和底包边胶带161、以及连接顶包边胶带160和底包边胶带161的侧包边胶带162，该顶包边胶带160粘接在显示屏15的顶边(即：显示屏15中顶面的边缘部分)，底包边胶带161粘接在底板100的底边(即：底板100中底面的边缘部分)，而侧包边胶带162粘接在显示屏15与背光模组的侧面。本实施中通过包边胶带16可对显示屏15和背光模组进行包边，并实现对显示屏15与背光模组的固定。
可选地，显示面板还可包括呈弯曲状的模组外壳2，该模组外壳2可采用亚克力(又称有机玻璃)材料制作而成，但不限于此；其中，前述显示模组1可安装在模组外壳2中，且该显示模组1的形状并与该模组外壳2的形状相匹配，也就是说，该显示面板整体可呈弯曲状。
详细说明，由于显示模组1具有可弯曲的特点，因此，在形成前述显示模组1后，可通过冷弯的方式将显示模组1弯曲成与模组外壳2的形状相匹配的形状，然后将弯曲后的显示模组1安装在模组外壳2内。其中，该显示模组1与模组外壳2可通过双面胶(例如：3M VHB型号胶带)的方式固定。
本领域技术人员在考虑说明书及实践本公开后，将容易想到本公开的其它实施方案。本公开旨在涵盖本公开的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本公开的真正范围和精神由所附的权利要求指出。

Claims (17)

  1. 一种背光模组，包括：
    背板，包括底板以及从所述底板的表面沿背离所述底板的方向延伸的第一侧板及第二侧板，所述第一侧板和所述第二侧板设置于所述底板在第一方向上的相对两侧，且所述第一侧板和所述第二侧板均具有向所述背板的内侧凸出的支撑部；
    光学膜材，设置在所述支撑部背离所述底板的一侧，且所述光学膜材的相对两端支撑在所述支撑部上；
    发光部件，设置在所述底板上并位于所述支撑部朝向所述底板的一侧，且所述发光部件的出光方向朝向所述光学膜材。
  2. 根据权利要求1所述的背光模组，其中，所述第一侧板和所述第二侧板均包括一体式成型的竖直板和弯折板，其中：
    所述竖直板具有与所述底板连接的一端，并沿背离所述底板的方向延伸；
    所述弯折板具有与所述底板连接的一端，并向所述背板的内侧弯折以形成所述支撑部。
  3. 根据权利要求2所述的背光模组，其中，所述弯折板包括第一部分和第二部分，所述第一部分具有与所述底板连接的一端并沿背离所述底板的方向延伸，所述第二部分具有连接至所述第一部分的在所述第一部分的延伸方向上的另一端的一端并向所述背板的内侧延伸以形成所述支撑部。
  4. 根据权利要求2或3所述的背光模组，其中，所述竖直板的在所述竖直板的延伸方向上的另一端与所述底板之间的距离大于所述支撑部的背离所述底板的表面与所述底板之间的距离。
  5. 根据要求2-4中任意一项所述的背光模组，其中，所述第一侧板和所述第二侧板均包括交替设置的多个竖直板和多个弯折板。
  6. 根据权利要求1至5中任意一项所述的背光模组，其中，
    所述背板还包括第一辅助支撑板和第二辅助支撑板，所述第一辅助支撑板和所述第二辅助支撑板设置于所述底板在第二方向上的相对两侧，所述第二方向与所述第一方向相互垂直；以及
    所述第一辅助支撑板和所述第二辅助支撑板均包括连接部和辅助支撑部，所述连接部的一端与所述底板连接，并沿背离所述底板的方向延伸，所述辅助支撑部具有连接至所述连接部的在所述连接部的延伸方向上的另一端的一端并向所述背板的内侧延伸；
    其中，所述辅助支撑部背离所述底板的表面与所述支撑部背离所述底板的表面位于同一平面上。
  7. 根据权利要求6所述的背光模组，其中，所述辅助支撑部和所述支撑部在垂直于所述底板的表面的方向上具有相同的厚度。
  8. 根据权利要求1至7中任意一项所述的背光模组，其中，在垂直于所述底板的表面的方向上，所述支撑部与所述发光部件之间具有间隙。
  9. 根据权利要求1至8中任意一项所述的背光模组，其中，所述光学膜材与所述发光部件之间的距离为2.5mm。
  10. 根据权利要求1至9中任意一项所述的背光模组，还包括：
    透明支撑板，设置在所述支撑部上，并位于所述光学膜材朝向所述支撑部的一侧。
  11. 根据权利要求1至10中任意一项所述的背光模组，其中，所述光学膜材包括依次堆叠在所述支撑部上的量子点膜片、扩散片、棱镜片及反射型偏光片。
  12. 根据权利要求1至11中任意一项所述的背光模组，其中，所述发光部件包括电路板及多个发光二极管，所述电路板设置在所述底板上，且各所述发光二极管设置在所述电路板背离所述底板的一侧。
  13. 根据权利要求2至5中任意一项所述的背光模组，其中，所述光学膜材设置在所述第一方向上设置在所述第一侧板的所述竖直板与所述第二侧板的所述竖直板之间。
  14. 一种显示面板，包括显示模组，其中，所述显示模组包括：
    根据权利要求1至8中任一项所述的背光模组；
    显示屏，设置在所述光学膜材背离所述支撑部的一侧。
  15. 根据权利要求14所述的显示面板，其中，所述显示模组还包括：
    包边胶带，包括相对设置的顶包边胶带和底包边胶带、以及连接所述顶包边胶带和所述底包边胶带的侧包边胶带，所述顶包边胶带粘接在所述显示屏的顶边，所述底包边胶带粘接在所述底板的底边，所述侧包边胶带粘接在所述显示屏与所述背光模组的侧面。
  16. 根据权利要求14或15所述的显示面板，还包括呈弯曲状的模组外壳，所述显示模组安装在所述模组外壳中，且所述显示模组的形状并与所述模组外壳的形状相匹配。
  17. 根据权利要求14至16中任意一项所述的显示面板，其中，所述显示屏的远离所述底板的表面与所述第一侧板和所述第二侧板的远离所述底板的表面的端表面在同一平面上。
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