WO2022077705A1 - 背光模组及液晶显示装置 - Google Patents

背光模组及液晶显示装置 Download PDF

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Publication number
WO2022077705A1
WO2022077705A1 PCT/CN2020/130741 CN2020130741W WO2022077705A1 WO 2022077705 A1 WO2022077705 A1 WO 2022077705A1 CN 2020130741 W CN2020130741 W CN 2020130741W WO 2022077705 A1 WO2022077705 A1 WO 2022077705A1
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WO
WIPO (PCT)
Prior art keywords
optical film
light
backlight module
boss
liquid crystal
Prior art date
Application number
PCT/CN2020/130741
Other languages
English (en)
French (fr)
Inventor
周政
Original Assignee
武汉华星光电技术有限公司
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 武汉华星光电技术有限公司 filed Critical 武汉华星光电技术有限公司
Priority to US17/260,988 priority Critical patent/US11852862B2/en
Publication of WO2022077705A1 publication Critical patent/WO2022077705A1/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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133314—Back frames
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/13332—Front frames
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133325—Assembling processes
    • 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

Definitions

  • the present application relates to the field of display technology, in particular to the field of backlight technology, and in particular to a backlight module and a liquid crystal display device.
  • automotive backlight modules With the development of in-vehicle display technology, the appearance requirements of automotive backlight modules are also getting higher and higher, and they tend to have large screens and narrow borders; in order to achieve their narrow borders, the current automotive backlight modules are usually on the steps of the light guide plate.
  • a double-sided tape is attached to fix the corresponding optical film on one side in the long direction of the backlight module; and the optical film is assembled and fixed on the basis of the fixed side, and the expansion and contraction space of the optical film is reserved on the other side.
  • bosses are generally designed on the light guide plate to fix the corresponding optical film; in view of the narrow frame limitation of the backlight module, there is no There is enough space to fix the optical film (the expansion space of the optical film is insufficient), and the light guide plate boss is designed on the lower side of the relatively wide frame, that is, the FPC (Flexible Printed Circuit, flexible circuit board) side, which is easy to cause backlight. Problems such as bright edges of the mod and firefly effect.
  • the present application provides a backlight module and a liquid crystal display device, which solve the problems of edge bright edge and firefly effect of a vehicle-mounted backlight module.
  • the present application provides a backlight module, which includes a backplane, a light bar, a first optical film, a plastic frame and an adhesive layer; the backplane has at least a first blocking wall and a second blocking wall disposed on opposite sides.
  • a retaining wall; a light bar is arranged on the inner side of the first retaining wall; the light incident surface of the first optical film faces the supporting surface of the back plate; and the pressing surface of the plastic frame faces the first The light-emitting surface of the optical film; wherein, on the side close to the second retaining wall, the pressing surface is bonded to the light-emitting surface of the first optical film through an adhesive layer.
  • a boss is provided on the pressing surface, and the boss is bonded to the light-emitting surface of the first optical film through the adhesive layer ; and the boss at least covers part of the pressing surface.
  • the boss is located on the pressing surface in the longitudinal direction, and is located in a middle region of the pressing surface.
  • the interference is 0.08 mm to 0.12 mm.
  • the boss is a rectangular parallelepiped, the length of the boss is 20 mm to 30 mm, the width of the boss is 2 mm to 3 mm, and the boss is The height is 0.1mm to 0.5mm.
  • the thickness of the adhesive layer is the distance between the boss and the first optical film.
  • the backlight module further includes a second optical film and a light-shielding elastic fixing member; the light incident surface of the second optical film is far away from the first optical film the light-incident surface of the film, and the light-emitting surface of the second optical film faces the light-incident surface of the first optical film; one end of the light-shielding elastic fixing member is connected to the first blocking wall, and the light-shielding elastic fixing member The other end is connected to the light-emitting surface of the second optical film, and the light-shielding elastic fixing member is located between the light-incident surface of the first optical film and the light-emitting surface of the second optical film; wherein, the light-shielding The elastic fixing member at least partially shields the light bar.
  • the light-shielding elastic fixing member is a black single-sided adhesive.
  • the length of the single-sided adhesive is 20 mm to 30 mm, and the width of the single-sided adhesive is 5 mm to 10 mm.
  • the second blocking wall at least partially overlaps the first optical film.
  • a distance from the first optical film to the first blocking wall is greater than a distance from the second optical film to the first blocking wall distance of a retaining wall.
  • the distance from the first optical film to the second blocking wall is equal to the distance from the second optical film to the The distance to the second retaining wall.
  • the adhesive layer is a double-sided tape.
  • the present application provides a liquid crystal display device, which includes the backlight module according to any one of the embodiments of the first aspect and a liquid crystal screen, wherein the liquid crystal screen is disposed on the back of the pressing surface.
  • the liquid crystal display device further includes a flexible circuit board; the flexible circuit board is connected to the liquid crystal screen.
  • the corresponding optical film is fixed on the opposite side of the light bar through the adhesive layer, so that the heat change amount of the corresponding optical film is concentrated on one side of the light bar, which is beneficial to realize the backlight for vehicle use
  • the module corresponds to the reliability of fixing the optical film and the narrow frame of the backlight module, and it is beneficial to eliminate or weaken the problems of the edge bright edge and the firefly effect of the backlight module.
  • FIG. 1 is a schematic structural diagram of a backlight module provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of the plastic frame in FIG. 1 .
  • FIG. 3 is a partial enlarged schematic view of the plastic frame and the boss in FIG. 2 .
  • FIG. 4 is a schematic structural diagram of a liquid crystal display device provided by an embodiment of the present application.
  • FIG. 1 shows a schematic structural diagram of a backlight module provided by this embodiment, which includes a backplane 10 , a light bar 60 , a first optical film 40 , a plastic frame 20 and a plastic Adhesive layer 30; wherein, the side of the bottom of the back plate 10 facing the light-emitting direction is its supporting surface 13, and the side wall of the back plate 10 at least includes a first retaining wall 11 and a second retaining wall 12, wherein the first retaining wall 11 and The second retaining wall 12 is provided on the opposite side.
  • Both the first retaining wall 11 and the second retaining wall 12 can be, but are not limited to, the long side of the backboard 10 or the short side of the backboard 10; 10 can be, but not limited to, integral casting of sheet metal, or other materials, or manufactured by other processes; wherein, the heights of the first retaining wall 11 and the second retaining wall 12 are different, and the height of the first retaining wall 11 is greater than The height of the second retaining wall 12 .
  • the light bar 60 is fixed on the inner side of the first blocking wall 11 ; the light incident surface of the first optical film 40 faces the supporting surface 13 of the backplane 10 , the first optical film 40 and the light bar 60 do not overlap, and the first optical film 40 It can be, but not limited to, at least partially overlap with the second retaining wall 12, and the support of the second retaining wall 12 can be obtained; the pressing surface 21 of the plastic frame 20 faces the light emitting surface of the first optical film 40, and is The light-emitting surface of an optical film 40 is bonded, wherein the adhesive layer 30 fixes the first optical film 40 on the side close to the second blocking wall 12 .
  • the second retaining wall 12 side may not reserve expansion space for these optical films, or reserve some small expansion space, which is conducive to the realization of Corresponding to the reliability of fixing the optical film in the vehicle-mounted backlight module and the narrow frame of the backlight module, it is beneficial to eliminate or weaken the adhesive layer 30 too close to the light bar 60, and has a certain reflection effect on the light emitted by the light bar 60. The resulting problem of bright edges and firefly effects of the backlight module.
  • the light-emitting surface and the light-incident surface in this embodiment refer to the front or back surface of the corresponding optical film
  • the light-emitting surface is the plane facing the side of the liquid crystal screen 100 , and vice versa
  • the light-incident surface is facing the back plate 10 .
  • the adhesive layer 30 can be, but not limited to, a double-sided adhesive tape, and can also be other connecting pieces to realize the connection between the pressing surface 21 / boss 22 and the first optical film 40 .
  • the backlight module can generate a large amount of heat when it is working.
  • the corresponding optical film When the corresponding optical film is affected by heat, it needs a certain expansion space to adapt to the thermal expansion. If there is no corresponding thermal expansion space If so, the corresponding optical film will bulge in some directions, which will affect the backlight effect emitted to the LCD screen 100, thereby affecting the overall display effect; and because it is in a vehicle-mounted motion environment, compared with other relatively static use environments , the fixation of these optical films requires better reliability.
  • a boss 22 is provided on the pressing surface 21 .
  • the boss 22 can be integrally formed with the glue frame 20 but is not limited to, and the boss 22 passes through the adhesive layer 30 .
  • the setting of the bosses 22 is convenient for adjusting the thickness of the adhesive layer 30, and the thickness of the adhesive layer 30 is at least the thickness of the bosses 22 and the first optical film 40. The distance between them, or the interference amount needs to be added. In order to maintain the plane angle of the first optical film 40 in space. It can be understood that the boss 22 at least covers a part of the pressing surface 21 , that is, the boss 22 has a certain area.
  • the pressing surface 21 Compared with the pressing surface 21 , it only occupies a part of the pressing surface 21 , and the size of the partial area depends on the The reliability required for fixing the first optical film 40 and the formation of reflective areas as little as possible can minimize or weaken the resulting problems such as bright edges and/or firefly effects.
  • the pressing surface 21 includes two pressing surfaces 21 on opposite sides in the length direction and two pressing surfaces 21 on opposite sides in the width direction. Regardless of whether the boss 22 is located on the pressing surface 21 in the length direction or the width direction, the technical purpose expected in this application can be achieved; as a preference, when the boss 22 is located on the pressing surface 21 in the longitudinal direction, and is located on the pressing surface The middle area of 21 and the position far away from the light bar 60 can obtain better expected technical effect.
  • the adhesive layer 30 is adhered to the central area of the first optical film 40 in the length direction or the width direction, which can maintain a good balance, and at the same time the adhesive layer 30 is located at the edge of the first optical film 40 Or in its vicinity, the reflection of light can be generated as little as possible.
  • the position of the bosses 22 should consider the bonding of the adhesive layer 30 on the first optical film 40 position, so as to design the corresponding boss 22 position.
  • the boss 22 is designed to be a rectangular parallelepiped, the length of the boss 22 can range from but not limited to 20mm to 30mm, the width of the boss 22 can range from but not limited to 2mm to 3mm, and the height of the boss 22 can range from 2mm to 3mm. It is 0.1mm to 0.5mm; preferably, the height of the boss 22 can be designed to be 0.2mm, or 0.3mm.
  • the amount of interference can be the amount of the adhesive layer 30 when bonding the first optical film 40 .
  • the pressing depth of the adhesive layer 30 is to ensure the allowable deformation range of the adhesive layer 30 and the mutual bonding strength. The best choice, the interference in this application will be 0.1mm.
  • the interference in this embodiment refers to the difference between the first thickness and the second thickness of the adhesive layer 30 in the original state (uncompressed), wherein the second thickness is the adhesive
  • the thickness of the layer 30 installed between the first optical film 40 and the boss 22/pressing surface 21 after being compressed or extruded.
  • the backlight module further includes a second optical film 50 and a light-shielding elastic fixing member 150 ;
  • the light-emitting surface of the second optical film 50 faces the light-incident surface of the first optical film 40; wherein, the side of the first optical film 40 and the side of the second optical film 50 on the side of the second barrier wall 12 can be different Not limited to being flush, that is, the distance from the first optical film 40 to the second blocking wall 12 is equal to the distance from the second optical film 50 to the second blocking wall 12, and at least partially covers the second blocking wall 12; and the first optical film The distance from 40 to the first blocking wall 11 is greater than the distance from the second optical film 50 to the first blocking wall 11 .
  • One end of the light-shielding elastic fixing member 150 is connected to the upper end surface and part or all of the outer side surface of the first blocking wall 11 , the other end of the light-shielding elastic fixing member 150 is connected to the light-emitting surface of the second optical film 50 , and the light-shielding elastic fixing member 150 is located between the light incident surface of the first optical film 40 and the light exit surface of the second optical film 50 ; wherein the light-shielding elastic fixing member 150 at least partially shields the light bar 60 .
  • the contact area between the light-shielding elastic fixing member 150 and the light incident surface of the first optical film 40 is flat and smooth.
  • the light-shielding elastic fixing member 150 can be connected by opening holes on the second optical film 50, or can also be realized by using black single-sided adhesive, for example, the single-sided adhesive One end is bonded to the light-emitting surface of the second optical film 50, and the other end of the single-sided adhesive is bonded along part or all of the upper end surface and the outer side of the first retaining wall 11, wherein one end of the single-sided adhesive is parallel to the second optical film.
  • the light-emitting surface of the film 50 is beyond the area where the light-emitting surface of the second optical film 50 is located, and is then disposed obliquely to the upper end surface of the first retaining wall 11, and is bonded to the upper end surface of the first retaining wall 11 and the outer surface thereof.
  • the single-sided adhesive when the second optical film 50 is thermally expanded and contracted, the single-sided adhesive will not hinder its expansion and contraction within a certain range, and the single-sided adhesive is set to Black, the light source can be blocked for the side-mounted light bar 60 before the light is guided, so as to avoid unnecessary reflected light, which is beneficial to eliminate or weaken the problem of the edge bright edge and firefly effect of the backlight module.
  • the length range of the single-sided adhesive can be but not limited to 20mm to 30mm, for example, it can be preferably set to 25mm; the width of the single-sided adhesive can be, but not limited to, 5mm to 10mm; for example, it can be preferably set to 2.5mm.
  • the backlight module may be further provided with a reflective sheet 70 , a light guide plate 80 and a third optical film 90 in the direction in which the supporting surface 13 of the backlight module faces the first optical film 40 , wherein the light guide plate 80 and the lamp
  • the strips 60 are opposite to guide the light emitted by the light strips 60, so that more uniform light can be emitted from the light guide plate 80.
  • the reflective sheet 70 can re-reflect the light emitted from the bottom of the light guide plate 80 into the light guide plate 80, and can Improve the efficiency of light use.
  • the third optical film 90 is located between the light guide plate 80 and the second optical film 50 and overlaps with the second optical film 50 .
  • the distance from the reflective sheet 70 to the first blocking wall 11 is smaller than the distance from the light guide plate 80 to the first blocking wall 11, and the distance from the reflective sheet 70 to the first blocking wall 11 is greater than The distance from the third optical film 90 to the first blocking wall 11 .
  • the distance from the second blocking wall 12 to the reflection sheet 70 and/or the light guide plate 80 may be, but not limited to, the same, and may also be a distance greater than zero.
  • a part of the third optical film 90 is located above the second blocking wall 12 and does not completely cover the second blocking wall 12 . It can be understood that, on the side close to the second blocking wall 12 , the distances from the first optical film 40 , the second optical film 50 and the third optical film 90 to the plastic frame 20 may be, but are not limited to, the same or the same.
  • the first optical film 40 is a polarized light-enhancing film, which is mainly composed of polycarbonate, which is a tough thermoplastic resin.
  • the optical film 40 mainly expands and extends toward the first retaining wall 11, and its expansion coefficient is about 75 ⁇ 10-6/ °C;
  • the second optical film 50 is a light-enhancing film, which is mainly composed of polyester resin, which is a thermoplastic polymer.
  • the most important type of ester, the expansion coefficient is about 35 ⁇ 10 -6 / °C, with the increase of the internal temperature of the backlight module, the second optical film 50 mainly shrinks toward the second retaining wall 12;
  • the third optical film 90 is a diffuser diaphragm.
  • the heat variation of the first optical film 40 and the second optical film 50 is concentrated on one side of the light bar 60, and there is no need to reserve too much expansion/contraction space on the opposite side of the light bar 60, which is beneficial to the realization of vehicle-mounted applications.
  • the light bar 60 may include, but is not limited to, a flexible circuit board 140 and an LED light 61 electrically connected to the flexible circuit substrate 62, wherein the LED light 61 is located on one side of the flexible circuit substrate 62, and the thermally conductive adhesive 63 Adhere the other side of the flexible circuit substrate 62 and fix it on the inner side of the first retaining wall 11; and between the other side of the flexible circuit substrate 62 and the support surface 13 is still provided with a thermally conductive adhesive 63 to accelerate The light bar 60 dissipates heat to the bottom plate.
  • the present application provides a liquid crystal display device, which includes the backlight module and the liquid crystal screen 100 in any of the above embodiments; the liquid crystal screen 100 is installed or fixed on the transparent glue 130 .
  • the back side or the reverse side of the pressing surface 21 of the plastic frame 20 It can be understood that the LCD panel 100 includes a driving IC 101 disposed thereon.
  • the liquid crystal display device may further include a flexible circuit board 140 ; the flexible circuit board 140 is connected to the driving IC 101 on the liquid crystal screen 100 through adhesive glue or thermal pressure bonding, and the flexible circuit board 140 is wound around the groove provided on the plastic frame 20 . to the other side of the backplane 10 and connect to external signals.
  • the outer connecting surfaces of the first blocking wall 11 and/or the second blocking wall 12 of the back plate 10 and the bottom are set in an arc shape or a circular arc shape.
  • the liquid crystal display device may further include an upper polarizer 110 and a lower polarizer 120 disposed on both sides of the liquid crystal screen 100; wherein the lower polarizer 120 is located between the transparent adhesive 130 and the liquid crystal screen 100, and is connected with the liquid crystal screen 100. Part of the transparent glue 130 is used for bonding.
  • the first optical film 40 is attached and fixed on the plastic frame 20 or the boss 22 by double-sided tape, which can prevent the first optical film 40 from being damaged.
  • the optical film 40 is displaced during vibration; at the same time, the corresponding optical film can expand and contract freely on the side of the light bar 60, which can prevent the optical film from expanding and shrinking during high and low temperature cycles, resulting in wrinkles and affecting the optical effect.
  • the second optical film 50 is fixed on the side of the light bar 60 with black single-sided adhesive, and is synchronously reversely attached to the upper end surface and part or all of the side surfaces of the first retaining wall 11, which can play the role of fixing the second optical film 50, and at the same time It can achieve the effect of blocking the light source, and can prevent the occurrence of bright spots; and under the premise of ensuring the high reliability requirements of the vehicle-mounted backlight module, it solves the problem that the narrow-frame backlight module cannot be used in the corresponding optical film due to the narrow frame.
  • the problem of reserving expansion gaps on one side in the length direction and the bright edges of narrow borders are examples of the second optical film 50.
  • the backlight module and the liquid crystal display device provided in this application can be applied to, but not limited to, the technical field of vehicle-mounted display and/or the technical field of narrow-frame display, and can also be applied to the technical field of polycrystalline silicon liquid crystal display, especially LTPS ( Low Temperature Poly-Silicon, low temperature polysilicon) liquid crystal display technology field.
  • LTPS Low Temperature Poly-Silicon, low temperature polysilicon

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  • Physics & Mathematics (AREA)
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Abstract

一种背光模组及液晶显示装置，该背光模组包括背板（10）、灯条（60）、第一光学膜（40）、胶框（20）以及胶粘层（30）；通过胶粘层（30）将对应的光学膜（40）固定于灯条（60）的对侧，使对应光学膜（40）的受热变化量集中于灯条（60）一侧，有利于实现车载用背光模组中对应光学膜（60）固定的可靠性及背光模组的窄边框化，以及有益于消除或者弱化背光模组的边缘亮边、萤火虫效应的问题。

Description

背光模组及液晶显示装置 技术领域
本申请涉及显示技术领域，尤其涉及背光技术领域，具体涉及一种背光模组及液晶显示装置。
 背景技术
随着车载显示技术的发展，车载用背光模组的外观要求也越来越高，趋于大屏化以及窄边框；为了实现其窄边框，现阶段的车载背光模组通常是在导光板台阶上贴双面胶，在背光模组的长方向上单侧固定对应的光学膜片；且以固定侧为基准进行光学膜片的组装固定，另一侧则保留光学膜片的胀缩空间。
由于车载用背光模组的可靠性要求相对比较严苛，一般采用在导光板上设计凸台，用于固定对应的光学膜片；鉴于背光模组的窄边框限制，在模组长方向上没有足够空间进行光学膜片的固定（光学膜片的膨胀空间不足），而在边框相对较宽的下侧即FPC（Flexible Printed Circuit，柔性电路板）一侧设计导光板凸台，则容易引起背光模组的边缘亮边以及萤火虫效应等问题。
 技术问题
本申请提供一种背光模组及液晶显示装置，解决了车载用背光模组的边缘亮边以及萤火虫效应的问题。
 技术解决方案
第一方面，本申请提供一种背光模组，其包括背板、灯条、第一光学膜、胶框以及胶粘层；所述背板至少具有对侧设置的第一挡墙和第二挡墙；灯条设置于所述第一挡墙的内侧面；所述第一光学膜的入光面朝向所述背板的支撑面；以及所述胶框的压合面朝向所述第一光学膜的出光面；其中，在靠近所述第二挡墙的一侧，所述压合面通过胶粘层与所述第一光学膜的出光面粘接。
基于第一方面，在第一方面的第一种实施方式中，所述压合面上设置有一凸台，所述凸台通过所述胶粘层与所述第一光学膜的出光面粘接；且所述凸台至少覆盖部分的所述压合面。
基于第一方面的第一种实施方式，在第一方面的第二种实施方式中，所述凸台位于长度方向上的所述压合面，且位于所述压合面的中部区域。
基于第一方面，在第一方面的第三种实施方式中，所述胶粘层与所述第一光学膜之间具有过盈量。
基于第一方面的第三种实施方式，在第一方面的第四种实施方式中，所述过盈量为0.08mm至0.12mm。
基于第一方面，在第一方面的第五种实施方式中，所述凸台为长方体，所述凸台的长度为20mm至30mm，所述凸台的宽度为2mm至3mm，所述凸台的高度为0.1mm至0.5mm。
基于第一方面，在第一方面的第六种实施方式中，所述胶粘层的厚度为所述凸台与所述第一光学膜之间的距离。
基于第一方面，在第一方面的第七种实施方式中，所述背光模组还包括第二光学膜和遮光弹性固定件；所述第二光学膜的入光面远离所述第一光学膜的入光面，且所述第二光学膜的出光面朝向所述第一光学膜的入光面；所述遮光弹性固定件的一端连接所述第一挡墙，所述遮光弹性固定件的另一端连接所述第二光学膜的出光面，且所述遮光弹性固定件位于所述第一光学膜的入光面与所述第二光学膜的出光面之间；其中，所述遮光弹性固定件至少部分遮挡所述灯条。
基于第一方面的第七种实施方式，在第一方面的第八种实施方式中，所述遮光弹性固定件为黑色单面胶。
基于第一方面的第八种实施方式，在第一方面的第九种实施方式中，所述单面胶的长度为20mm至30mm，所述单面胶的宽度为5mm至10mm。
基于第一方面的任一种实施方式，在第一方面的第十种实施方式中，所述第二挡墙与所述第一光学膜至少部分重叠。
基于第一方面的第十种实施方式，在第一方面的第十一种实施方式中，所述第一光学膜至所述第一挡墙的距离大于所述第二光学膜至所述第一挡墙的距离。
基于第一方面的第十一种实施方式，在第一方面的第十二种实施方式中，所述第一光学膜至所述第二挡墙的距离等于所述第二光学膜至所述第二挡墙的距离。
基于第一方面的任一种实施方式，在第一方面的第十三种实施方式中，所述胶粘层为双面胶。
第二方面，本申请提供一种液晶显示装置，其包括如第一方面中任一实施方式所述的背光模组和液晶屏，所述液晶屏设置于所述压合面的背面。
基于第二方面，在第二方面的第一种实施方式中，所述液晶显示装置还包括柔性电路板；所述柔性电路板与所述液晶屏连接。
 有益效果
本申请提供的背光模组及液晶显示装置，通过胶粘层将对应的光学膜固定于灯条的对侧，使对应光学膜的受热变化量集中于灯条一侧，有利于实现车载用背光模组中对应光学膜固定的可靠性及背光模组的窄边框化，以及有益于消除或者弱化背光模组的边缘亮边、萤火虫效应的问题。
 附图说明
图1为本申请实施例提供的背光模组的结构示意图。
图2为图1中胶框的结构示意图。
图3为图2中胶框与凸台的局部放大示意图。
图4为本申请实施例提供的液晶显示装置的结构示意图。
 本发明的实施方式
为使本申请的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本申请进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
请参考图1至图4，其中，图1示出了本实施例提供的一种背光模组的结构示意图，其包括背板10、灯条60、第一光学膜40、胶框20以及胶粘层30；其中，背板10的底部朝向出光方向的一面为其支撑面13，背板10的侧壁至少包括第一挡墙11和第二挡墙12，其中，第一挡墙11和第二挡墙12为对侧设置的，第一挡墙11、第二挡墙12均可以但不限于为背板10的长边，也可以为背板10的短边；其中，该背板10可以但不限于为钣金一体铸造成型，也可以为其它材料，或者其他工艺制造出来的；其中，第一挡墙11与第二挡墙12的高度不同，第一挡墙11的高度大于第二挡墙12的高度。灯条60固定于第一挡墙11的内侧面；第一光学膜40的入光面朝向背板10的支撑面13，第一光学膜40与灯条60不发生重叠，第一光学膜40可以但不限于与第二挡墙12至少部分重叠，可以获得第二挡墙12的支撑；胶框20的压合面21朝向第一光学膜40的出光面，并通过胶粘层30与第一光学膜40的出光面粘接，其中，胶粘层30在靠近第二挡墙12的这一侧固定第一光学膜40，在发生热胀冷缩时，第一光学膜40的伸缩方向大致是朝向第一挡墙11的，使对应光学膜的膨胀方向一致，则第二挡墙12侧可以不为这些光学膜预留膨胀空间，或者预留些较小的膨胀空间，有利于实现车载用背光模组中对应光学膜固定的可靠性及背光模组的窄边框化，以及有益于消除或者弱化胶粘层30过于靠近灯条60，而对灯条60发出的灯光具有一定反射作用导致的背光模组的边缘亮边、萤火虫效应的问题。
需要进行说明的是，本实施例中的出光面、入光面是指对应光学膜的正面或者反面，出光面为朝向液晶屏100的一侧的平面，反之，入光面为朝向背板10的支撑面13的平面。其中，基于经济实用性方面的考量，胶粘层30可以但不限于为双面胶，也可以是其它的连接件来实现压合面21/凸台22与第一光学膜40之间的连接。
可以理解的是，背光模组在工作时，能够产生大量的热量，对应的光学膜在受到热量影响的情况下，其自身需要一定的膨胀空间来适应所受到的热膨胀，如果没有对应的热膨胀空间的话，对应的光学膜会在一些方向上鼓起，影响出射到液晶屏100的背光效果，进而影响整体的显示效果；以及由于其处于车载的运动环境中，相比于其他较为静止的使用环境，这些光学膜的固定需要更为出色的可靠性。
如图2或者图3所示，在其中一个实施例中，压合面21上设置有一凸台22，该凸台22可以但不限于与胶框20一体成型，凸台22通过胶粘层30与第一光学膜40的出光面粘接，可以理解的是，凸台22的设置，便于调整胶粘层30的厚度，胶粘层30的厚度至少为凸台22与第一光学膜40之间的距离，或者还需要加上过盈量。以维持第一光学膜40在空间上的平面角度。可以理解的是，凸台22至少覆盖部分的压合面21，即凸台22具有一定的面积，与压合面21相比，仅占压合面21的一部分区域，该部分区域的大小取决于第一光学膜40固定所需要的可靠性，以及尽量少的形成反射区域，可以尽量减小或者弱化由此带来的边缘亮边和/或萤火虫效应等问题。
可以理解的是，压合面21包括两个长度方向上对侧的压合面21和两个宽度方向上对侧的压合面21。无论凸台22位于长度方向或者宽度方向上的压合面21，均可以实现本申请中预期的技术目的；作为优选的，当凸台22位于长度方向的压合面21，并位于压合面21的中部区域，且远离灯条60的位置，能够获得更佳的预期技术效果。
需要进行说明的是，胶粘层30粘接于第一光学膜40在长度方向或者宽度方向上的中心区域，可以保持较好的平衡性，同时胶粘层30位于第一光学膜40的边缘或者其附近处，可以尽可能少地产生光的反射。对应地，如果在其中一些实施例中加入了凸台22的使用来减少胶粘层30的厚度的话，那么凸台22的位置设置应该考虑胶粘层30在第一光学膜40上的粘接位置，以便进行对应的凸台22位置设计。
在其中一个实施例中，设计凸台22为长方体，凸台22的长度范围可以但不限于为20mm至30mm，凸台22的宽度范围可以但不限于为2mm至3mm，凸台22的高度范围为0.1mm至0.5mm；优选的，可以设计凸台22的高度为0.2mm，或者0.3mm。
在其中一个实施例中，胶粘层30与第一光学膜40之间具有过盈量，可以理解的是，该过盈量可以为胶粘层30在进行粘接第一光学膜40时胶粘层30的压合深度，以保证胶粘层30的允许变形范围和相互之间的粘接强度，作为优选的，本申请中的过盈量的设计范围为0.08mm至0.12mm，作为更优的选择，本申请中的过盈量会采用0.1mm。
需要进行说明的是，本实施例中的过盈量是指胶粘层30在原状态（未被压缩的情况）下的第一厚度与第二厚度的差值，其中，第二厚度为胶粘层30安装于第一光学膜40与凸台22/压合面21之间且被压缩或者挤压后的厚度。
如图1或者图4所示，在其中一个实施例中，背光模组还包括第二光学膜50和遮光弹性固定件150；第二光学膜50的入光面远离第一光学膜40的入光面，且第二光学膜50的出光面朝向第一光学膜40的入光面；其中，位于第二挡墙12侧的第一光学膜40的侧面与第二光学膜50的侧面可以但不限于是平齐的即第一光学膜40至第二挡墙12的距离等于第二光学膜50至第二挡墙12的距离，且至少部分覆盖第二挡墙12；而第一光学膜40至第一挡墙11的距离大于第二光学膜50至第一挡墙11的距离。其中，遮光弹性固定件150的一端连接于第一挡墙11的上端面以及外侧面的部分或者全部，遮光弹性固定件150的另一端连接第二光学膜50的出光面，且遮光弹性固定件150位于第一光学膜40的入光面与第二光学膜50的出光面之间；其中，遮光弹性固定件150至少部分遮挡灯条60。
可以理解的是，这并不会影响到第一光学膜40在热胀冷缩上的自由度，遮光弹性固定件150与第一光学膜40的入光面的接触区域是平整光滑的，相互之间可以仅为接触并无连接的作用；而遮光弹性固定件150可以通过在第二光学膜50上开孔进行连接，或者也可以采用黑色的单面胶进行实现，例如，单面胶的一端粘接第二光学膜50的出光面，单面胶的另一端沿第一挡墙11的上端面以及外侧面的部分或者全部进行粘接，其中，单面胶的一端平行于第二光学膜50的出光面，并且超出第二光学膜50的出光面的所在区域，然后斜向设置至第一挡墙11的上端面，并粘接第一挡墙11的上端面以及其外侧面的部分或者全部，可以理解的是，该种设计方式，在第二光学膜50进行热胀冷缩时，该单面胶并不会阻碍其在一定范围内的胀缩，并且单面胶设置为黑色，可以对侧置的灯条60在未经导光前进行光源遮挡，以避免不需要的反射光出现，有益于消除或者弱化背光模组的边缘亮边、萤火虫效应的问题。
其中，单面胶的长度范围可以但不限于为20mm至30mm，例如，作为优选的可以设置为25mm；单面胶的宽度范围可以但不限于为5mm至10mm；例如，作为优选的可以设置为2.5mm。
在其中一个实施例中，背光模组在其支撑面13朝向第一光学膜40的方向上还可以依次设置有反射片70、导光板80以及第三光学膜90，其中，导光板80与灯条60对置以对灯条60发出的灯光进行导光，以使从导光板80发出更为均匀的光线，反射片70可以将从导光板80底部的出光重新反射至导光板80中，可以提高光的使用效率。第三光学膜90位于导光板80与第二光学膜50之间，并与第二光学膜50相重叠。其中，在与第一挡墙11的距离方面，反射片70至第一挡墙11的距离小于导光板80至第一挡墙11的距离，而反射片70至第一挡墙11的距离大于第三光学膜90至第一挡墙11的距离。其中，第二挡墙12至反射片70和/或导光板80的距离可以但不限于相等，也可以是一个大于零的距离。其中，第三光学膜90片的一部分位于第二挡墙12的上方，且并不完全覆盖第二挡墙12。可以理解的是，在靠近第二挡墙12的一侧，第一光学膜40、第二光学膜50以及第三光学膜90至胶框20的距离可以但不限于相等或者相同。
需要进行说明的是，第一光学膜40为偏振型增光膜片，其主要由聚碳酸酯构成，聚碳酸酯是一种强韧的热塑性树脂，随着背光模组内部温度的提升，第一光学膜40主要向第一挡墙11膨胀延伸，其膨胀系数大约为75×10 -6/℃；第二光学膜50为增光膜片，该增光膜片主要由涤纶树脂构成，其是热塑性聚酯中最主要的品种，膨胀系数大约为35×10 -6/℃，随着背光模组内部温度的提升，第二光学膜50主要向第二挡墙12收缩；第三光学膜90为扩散膜片。这样的话，第一光学膜40和第二光学膜50受热变化量集中于灯条60的一侧，而在灯条60的对侧无需预留过多的膨胀/收缩空间，有利于实现车载用背光模组中对应光学膜固定的可靠性及背光模组的窄边框化。
在其中一个实施例中，灯条60可以但不限于包括柔性电路板140和与柔性电路基板62电性连接的LED灯61，其中，LED灯61位于柔性电路基板62的一侧，导热胶63粘接柔性电路基板62的另一侧，并将其固定在第一挡墙11的内侧面；而且在柔性电路基板62的另一侧与支撑面13之间依然设置有导热胶63，以加速灯条60散热至底板。
如图4所示，在其中一个实施例中，本申请提供一种液晶显示装置，其包括上述任一实施例中的背光模组和液晶屏100；液晶屏100通过透明胶130安装或者固定于胶框20的压合面21的背面或者反面上。可以理解的是，该液晶屏100包括有设置在其上的驱动IC101。
其中，液晶显示装置还可以包括柔性电路板140；柔性电路板140通过粘性胶或者热压合与液晶屏100上的驱动IC101进行连接，柔性电路板140通过设置在胶框20上的凹槽绕至背板10的另一侧，并接入外部信号。其中，背板10的第一挡墙11和/或第二挡墙12与底部的外连接面设置为弧形或者圆弧形。
在其中一个实施例中，液晶显示装置还可以包括设置在液晶屏100两侧的上偏光片110和下偏光片120；其中，下偏光片120位于透明胶130与液晶屏100之间，并与部分的透明胶130进行粘接。
可以理解的是，本申请提供的背光模组以及液晶显示装置，在Z轴方向上，第一光学膜40通过双面胶被贴附固定在胶框20或者凸台22上，可以防止第一光学膜40在震动时发生位移；同时，对应的光学膜可以在灯条60侧自由胀缩，可以防止高低温循环时，光学膜无法胀缩导致褶皱，影响光学效果。在灯条60侧采用黑色单面胶固定第二光学膜50，并同步反贴至第一挡墙11的上端面以及部分或者全部的侧面，可以起到固定第二光学膜50的作用，同时可以实现遮挡光源的效果，能够起到防止亮斑产生的作用；进而保证车载用背光模组的高可靠性要求的前提下，解决了窄边框型背光模组因边框较窄无法在对应光学膜的长度方向上单侧预留膨胀间隙以及窄边框亮边的问题。
需要进行说明的是，本申请提供的背光模组以及液晶显示装置可以但不限于应用于车载显示技术领域和/或者窄边框显示技术领域，还可以应用于多晶硅液晶显示技术领域，尤其是LTPS（Low Temperature Poly-Silicon，低温多晶硅）液晶显示技术领域。
可以理解的是，对本领域普通技术人员来说，可以根据本申请的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本申请所附的权利要求的保护范围。

Claims (20)

  1. 一种背光模组，其中，包括：
    背板，所述背板至少具有对侧设置的第一挡墙和第二挡墙；
    灯条，设置于所述第一挡墙的内侧面；
    第一光学膜，所述第一光学膜的入光面朝向所述背板的支撑面；以及
    胶框，所述胶框的压合面朝向所述第一光学膜的出光面；
    其中，在靠近所述第二挡墙的一侧，所述压合面通过胶粘层与所述第一光学膜的出光面粘接。
  2. 根据权利要求1所述的背光模组，其中，所述压合面上设置有一凸台，所述凸台通过所述胶粘层与所述第一光学膜的出光面粘接；且所述凸台至少覆盖部分的所述压合面。
  3. 根据权利要求2所述的背光模组，其中，所述凸台位于长度方向上的所述压合面，且位于所述压合面的中部区域。
  4. 根据权利要求1所述的背光模组，其中，所述胶粘层与所述第一光学膜之间具有过盈量。
  5. 根据权利要求4所述的背光模组，其中，所述过盈量为0.08mm至0.12mm。
  6. 根据权利要求1所述的背光模组，其中，所述凸台为长方体，所述凸台的长度为20mm至30mm，所述凸台的宽度为2mm至3mm，所述凸台的高度为0.1mm至0.5mm。
  7. 根据权利要求1所述的背光模组，其中，所述胶粘层的厚度为所述凸台与所述第一光学膜之间的距离。
  8. 根据权利要求1所述的背光模组，其中，所述背光模组还包括第二光学膜和遮光弹性固定件；
    所述第二光学膜的入光面远离所述第一光学膜的入光面，且所述第二光学膜的出光面朝向所述第一光学膜的入光面；
    所述遮光弹性固定件的一端连接所述第一挡墙，所述遮光弹性固定件的另一端连接所述第二光学膜的出光面，且所述遮光弹性固定件位于所述第一光学膜的入光面与所述第二光学膜的出光面之间；
    其中，所述遮光弹性固定件至少部分遮挡所述灯条。
  9. 根据权利要求8所述的背光模组，其中，所述遮光弹性固定件为黑色单面胶。
  10. 根据权利要求9所述的背光模组，其中，所述单面胶的长度为20mm至30mm，所述单面胶的宽度为5mm至10mm。
  11. 根据权利要求1所述的背光模组，其中，所述第二挡墙与所述第一光学膜至少部分重叠。
  12. 根据权利要求11所述的背光模组，其中，所述第一光学膜至所述第一挡墙的距离大于所述第二光学膜至所述第一挡墙的距离。
  13. 根据权利要求12所述的背光模组，其中，所述第一光学膜至所述第二挡墙的距离等于所述第二光学膜至所述第二挡墙的距离。
  14. 根据权利要求1所述的背光模组，其中，所述胶粘层为双面胶。
  15. 一种液晶显示装置，其中，包括：
    如权利要求1所述的背光模组；和
    液晶屏，所述液晶屏设置于所述压合面的背面。
  16. 根据权利要求15所述的液晶显示装置，其中，所述液晶显示装置还包括柔性电路板；所述柔性电路板与所述液晶屏连接。
  17. 根据权利要求16所述的液晶显示装置，其中，所述压合面上设置有一凸台，所述凸台通过所述胶粘层与所述第一光学膜的出光面粘接；且所述凸台至少覆盖部分的所述压合面。
  18. 根据权利要求17所述的液晶显示装置，其中，所述凸台位于长度方向上的所述压合面，且位于所述压合面的中部区域。
  19. 根据权利要求15所述的液晶显示装置，其中，所述胶粘层与所述第一光学膜之间具有过盈量。
  20. 根据权利要求19所述的液晶显示装置，其中，所述过盈量为0.08mm至0.12mm。
PCT/CN2020/130741 2020-10-13 2020-11-23 背光模组及液晶显示装置 WO2022077705A1 (zh)

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