WO2021259044A1 - 背光模组、显示面板和显示装置 - Google Patents

背光模组、显示面板和显示装置 Download PDF

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Publication number
WO2021259044A1
WO2021259044A1 PCT/CN2021/098438 CN2021098438W WO2021259044A1 WO 2021259044 A1 WO2021259044 A1 WO 2021259044A1 CN 2021098438 W CN2021098438 W CN 2021098438W WO 2021259044 A1 WO2021259044 A1 WO 2021259044A1
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WO
WIPO (PCT)
Prior art keywords
protrusion
light bar
backlight module
side wall
frame
Prior art date
Application number
PCT/CN2021/098438
Other languages
English (en)
French (fr)
Inventor
崔鲁贵
张传伟
程显荣
Original Assignee
高创(苏州)电子有限公司
京东方科技集团股份有限公司
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 高创(苏州)电子有限公司, 京东方科技集团股份有限公司 filed Critical 高创(苏州)电子有限公司
Priority to US17/780,571 priority Critical patent/US20230350123A1/en
Publication of WO2021259044A1 publication Critical patent/WO2021259044A1/zh

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Classifications

    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • 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

Definitions

  • the present disclosure relates to the field of displays, in particular to a backlight module, a display panel and a display device.
  • the side-type backlight module is a commonly used backlight module.
  • the side-type backlight module includes a back plate, a light bar and a reflector.
  • the back plate includes a bottom plate and a frame surrounding the bottom plate.
  • the light bar is located on the inner side wall of the frame.
  • the reflection sheet is located in the frame and on the bottom plate, and the light bar is arranged opposite to one side of the reflection sheet.
  • the light emitted by the light bar is emitted from the light-emitting surface of the edge-type backlight module, and part of the light that cannot be emitted from the light-emitting surface reaches the reflector, and the reflector reflects the light to make the light again from the light-emitting surface of the edge-type backlight module Eject to improve display brightness.
  • the embodiments of the present disclosure provide a backlight module, a display panel, and a display device, so as to prevent the reflective sheet from moving too large when contracted, which affects the display brightness and display effect of the display panel.
  • the technical solution is as follows:
  • the present disclosure provides a backlight module, which includes:
  • the backplane includes a bottom plate and a frame surrounding the bottom plate; at least one light bar is fixed on the inner side wall of the frame. In the extending direction of the light bar, the end of the light bar is connected to the frame There is a gap between the inner side walls; the reflective sheet is located in the frame and on the bottom plate, at least one first side wall of the reflective sheet has at least one first protrusion, and the first protrusion The first side wall extends toward the inner side wall of the frame opposite to the first side wall, and the first protrusion is located in the gap.
  • connection between the first protrusion and the first side wall is provided with a slit, and in the first direction, the slit extends from the first protrusion.
  • a side close to the corresponding light bar extends to the middle of the first protrusion, and the first direction is the extending direction of the light bar opposite to the first protrusion.
  • the first side wall has two first protrusions, and the light bar is located between the two first protrusions.
  • the length of the slit in the first direction, is less than one-half of the first length of the first protrusion, and is greater than the first protrusion. From one third of the first length.
  • the first length of the first protrusion is greater than the maximum expansion value of the reflective sheet at a predetermined temperature, and the first protrusion The light bar opposite to the first protrusion is located on the same side of the reflective sheet.
  • the second length of the first protrusion is smaller than the first distance, and the first distance is the distance between the side of the light bar and the inner side wall where the light bar is located in the second direction.
  • the distance between the inner side walls; the second direction is perpendicular to the first direction, and the second direction is parallel to the surface of the reflective sheet.
  • the second length is greater than 1.2 mm.
  • the distance between the first protrusion and the light bar ranges from 0.3 mm to 0.7 mm.
  • the number of the light bars and the number of the first side walls are both one.
  • the at least one light bar includes a first light bar and a second light bar, and the first light bar and the second light bar are respectively located on two sides of the frame.
  • the at least one first side wall includes two adjacent and connected first side walls, and the two first side walls are connected to the first light bar and the first The two light bars are opposite.
  • At least one second side wall of the reflective sheet has a second protrusion facing the inner side wall of the frame; the second protrusion and the first protrusion Located on different side walls.
  • the second side wall has two second protrusions arranged at intervals.
  • the distance between the second protrusion and the inner side wall of the frame opposite to the second protrusion ranges from 0.3 mm to 0.7 mm, and the second protrusion The inner side wall of the frame opposite to the second protrusion is located on the same side of the reflective sheet.
  • the backlight module further includes: a light guide plate located in the frame, and the light guide plate, the reflective sheet, and the bottom plate are sequentially stacked.
  • the light bar is a blue light bar
  • the reflective sheet has yellow ink on the side facing the light guide plate, and the yellow ink is located on the edge of the reflective sheet.
  • the backlight module further includes: an optical film located in the frame, and the light guide plate is located between the reflective sheet and the optical film.
  • the optical film includes at least one of a diffusion sheet and a brightness enhancement sheet.
  • the backlight module further includes a heat dissipation plate located between the light bar and the inner side wall of the frame facing the light bar.
  • the present disclosure provides a display panel, the display panel comprising: a display substrate, and the backlight module of any one of the above aspects.
  • the present disclosure provides a display device that includes a power supply component and the display panel according to any one of the above aspects, and the power supply component is used to supply power to the display panel.
  • FIG. 1 is a top view of a backlight module provided by an embodiment of the present disclosure
  • Figure 2 is a cross-sectional view of the A-A plane in Figure 1;
  • FIG. 3 is a cross-sectional view of a backlight module provided by an embodiment of the present disclosure.
  • FIG. 4 is a top view of another backlight module provided by an embodiment of the present disclosure.
  • FIG. 5 is a partial schematic diagram of the backlight module provided in FIG. 1;
  • FIG. 6 is a partial schematic diagram of the backlight module provided in FIG. 4;
  • FIG. 7 is a partial schematic diagram of the backlight module provided in FIG. 4;
  • FIG. 8 is a partial top view of a backlight module provided by an embodiment of the present disclosure.
  • FIG. 9 is a top view of a reflective sheet provided by an embodiment of the present disclosure.
  • the reflection sheet there is a certain distance between the reflective sheet and the inner side wall of the frame.
  • the size of the reflection sheet becomes larger, and the distance between the reflection sheet and the inner side wall of the frame provides a certain space for the expansion of the reflection sheet, so as to prevent the reflection sheet from colliding with the frame of the back plate and cause damage to the reflection sheet.
  • the reflective sheet is made by stretching under high temperature conditions, so the reflective sheet shrinks at high temperature, and the reflective sheet shrinks differently in different directions.
  • the length of the 65-inch reflective sheet is 1440 mm, and the width of the 65-inch reflective sheet is 810 mm.
  • the reflector sheet shrinks at a temperature of 80 degrees Celsius (°C), and the shrinkage value of the reflector sheet in the longitudinal direction (English: Machine Direction, abbreviation: MD) (the difference between the length before shrinkage and the length after shrinkage) is 4.32 Mm, the shrinkage rate (the ratio of the shrinkage value to the length before shrinking) is 0.30%; the shrinkage value of the reflective sheet in the transverse direction (English: Transverse Direction, abbreviation: TD) is 0.648 mm, and the shrinkage rate is 0.08%.
  • MD Machine Direction
  • TD Transverse Direction
  • the gap between the reflective sheet and the inner side wall of the frame can prevent damage to the reflective sheet caused by the expansion of the reflective sheet.
  • the distance between the reflective sheet and the inner side wall of the frame will increase, resulting in an excessively large moving range of the reflective sheet.
  • the reflective sheet moves, the area where the reflective sheet can reflect light may be reduced, which not only affects the amount of light emitted, but also causes uneven display, thereby affecting the display brightness and display effect of the display panel.
  • FIG. 1 is a top view of a backlight module provided by an embodiment of the present disclosure.
  • the backlight module includes: a back plate 10, a light bar 20, and a reflective sheet 30.
  • the backplane 10 includes a bottom plate 101 and a frame 102 surrounding the bottom plate 101.
  • the light bar 20 is fixed on the inner side wall of the frame 102. In the extending direction of the light bar 20, there is a gap (English: Gap) 103 between the end of the light bar 20 and the inner side wall of the frame 102.
  • the reflective sheet 30 is located in the frame 102 and on the bottom plate 101.
  • the first side wall 311 of the reflective sheet 30 has at least one first protrusion 301.
  • An inner side wall of the frame 102 opposite to a side wall 311 extends, and the first protrusion 301 is located in the gap 103.
  • Fig. 2 is a cross-sectional view of the A-A plane in Fig. 1.
  • the reflective sheet 30 is located on the bottom plate 101, the bottom plate 101 and the frame 102 form an accommodating space 104, and the light bar 20 and the reflective sheet 30 are located in the accommodating space 104.
  • the reflection sheet is located in the frame of the backplane.
  • the periphery of the reflection sheet will shrink toward the center of the reflection sheet, so that the size of the reflection sheet becomes smaller.
  • the reflection sheet and the inner side wall of the frame The distance between them becomes larger, and the movable range of the reflective sheet is larger.
  • the movement of the reflection sheet exceeds a certain range, the overlapping area of the reflection sheet and the light guide plate on the side of the reflection sheet becomes smaller, so that the area where the reflection sheet can reflect light is reduced, which affects the amount of light emitted and causes uneven display effects.
  • a first protrusion is arranged on the first side wall of the reflector, and the first protrusion is located in the gap between the end of the light bar and the inner side wall of the frame.
  • the first protrusion will block the end of the light bar, thereby restricting the movement range of the reflector through the light bar, avoiding excessive movement of the reflector and reducing the area where the reflector can reflect light, thereby ensuring the light
  • the output amount and display uniformity of the display panel enhance the display brightness and display effect of the display panel.
  • FIG. 3 is a cross-sectional view of a backlight module provided by an embodiment of the present disclosure.
  • the backlight module further includes a light guide plate 40.
  • the light guide plate 40 is located in the frame 102, and the light guide plate 40, the reflective sheet 30 and the bottom plate 101 are stacked in sequence, that is, the reflective sheet 30 is located between the bottom plate 101 and the light guide plate 40.
  • the bottom plate 101 of the back plate 10 is used to support structures such as the reflective sheet 30 and the light guide plate 40, and the frame 102 of the back plate 10 is used to install the light bar 20.
  • the light bar 20 is fixed on the inner side wall of the frame 102.
  • the light emitting surface of the light bar 20 faces the light guide plate 40.
  • the light guide plate 40 converts the light emitted by the light bar 20 into a surface light source, so that the light distribution on the light emitting surface of the display panel is more uniform. Improve the display effect.
  • the reflection sheet 30 is located below the light guide plate 40. When part of the light passing through the light guide plate 40 reaches the reflection sheet 30, the reflection sheet 30 reflects the light so that the light reaches the light guide plate 40 again and is emitted from the light guide plate 40 to improve display brightness.
  • the light bar 20 is fixed on the inner side wall of the frame 102, that is, the light emitted by the light bar 20 enters the light guide plate 40 from the side of the light guide plate 40, and the backlight module is an edge-type backlight module. Group.
  • the bottom plate 101 is a rectangular bottom plate
  • the frame 102 is a rectangular frame
  • the frame 102 is arranged along the edge of the bottom plate 101.
  • the bottom plate 101 and the frame 102 may also have other shapes, for example, a circular bottom plate, a circular ring frame, etc., which are not limited in the present disclosure.
  • the bottom plate 101 and the frame 102 may be an integral structure, or the bottom plate 101 and the frame 102 can be fixed together by welding or the like.
  • the light bar 20 may be fixed on the inner side wall of the frame 102 by bonding or the like.
  • the shapes of the reflective sheet 30 and the light guide plate 40 match the shapes of the bottom plate and the frame.
  • the light guide plate 40 is also rectangular, reflecting The sheet 30 is approximately rectangular.
  • the reflection sheet may be a metal reflection sheet.
  • the light guide plate 40 may be a polymethyl methacrylate light guide plate or a light guide plate made of polycarbonate.
  • the reflective sheet 30 has a reflective surface and a side wall connected to the reflective surface.
  • the reflective surface may be the surface of the reflective sheet 30 opposite to the light guide plate 40, and the side wall of the reflective sheet 30 is opposite to the inner side wall of the frame.
  • the first protrusion 301 is located on at least one side wall of the reflective sheet 30.
  • the backlight module has only one light bar 20, and only one side wall of the reflective sheet 30 has the first protrusion 301.
  • the number of light bars 20 and the number of first side walls 311 are both one.
  • the light bar 20 is the first light bar 201.
  • the first protrusion 301 is located on the first side wall 311, there is a gap 103 between the end of the first light bar 201 and the inner side wall of the frame 102, and the first protrusion 301 is located in the gap 103.
  • a light bar is arranged in the backlight module, which is the first light bar 201, and the first protrusion 301 is arranged on the first side wall 311 corresponding to the first light bar 201.
  • the first protrusion 301 will resist the end of the first light bar 201 to prevent the reflection sheet 30 from moving too much in the extending direction of the first light bar 201. Avoid affecting the display brightness and display effect of the display panel.
  • the longitudinal direction of the reflective sheet 30 is consistent with the extending direction of the first light bar 201, that is, the reflective sheet 30 is in the first light bar 201.
  • the contraction in the extending direction of the light bar 201 is more obvious, so arranging the first protrusion 301 on the first side wall 311 corresponding to the first light bar 201 can limit the extension of the reflector 30 on the first light bar 201
  • the movement in the direction restricts the movement of the reflective sheet 30 in the extending direction of the first light bar 201, which can avoid the excessive movement of the reflective sheet 30 caused by the excessive heat shrinkage of the reflective sheet 30, which may cause display problems.
  • the backlight module has two light bars 20, which are respectively located on the inner sidewalls of two adjacent sides of the frame 102.
  • the reflective sheet 30 and the two inner sides There are first protrusions 301 on the opposite side walls of the wall.
  • FIG. 4 is a top view of another backlight module provided by an embodiment of the present disclosure.
  • the light bar 20 may include a first light bar 201 and a second light bar 202, and the first light bar 201 and the second light bar 202 are respectively located on the inner side walls of two adjacent sides of the frame 102.
  • the first side wall 311 includes two adjacent and connected first side walls 311, and the two first side walls 311 are respectively opposite to the first light bar 201 and the second light bar 202.
  • two light bars 20 are arranged in the backlight module, namely the first light bar 201 and the second light bar 202, which can improve the brightness of the display panel.
  • the first protrusion 301 is arranged on the first side wall 311 corresponding to the first light bar 201, and the first protrusion 301 is also arranged on the first side wall 311 corresponding to the second light bar 202.
  • the first protrusion 301 of the first side wall 311 corresponding to the first light bar 201 will resist the end of the first light bar 201, and when the reflector 30 is on the second light bar 201
  • the first protrusion 301 of the first side wall 311 corresponding to the second light bar 202 will resist on the end of the second light bar 202.
  • the first light bar 201 and the second light bar 202 are respectively located on two adjacent inner side walls of the frame 102, that is, the extension direction of the first light bar 201 and the extension direction of the second light bar 202 are different, and the two The movement of the reflection sheet 30 is restricted in the direction, and the restriction effect on the reflection sheet 30 is better.
  • the extension direction of the first light bar 201 is consistent with the longitudinal direction of the reflective sheet 30, and the extension direction of the second light bar 202 is consistent with the lateral direction of the reflective sheet 30, while restricting in the longitudinal direction and the lateral direction.
  • the movement of the reflective sheet 30 strengthens the restriction effect on the reflective sheet 30, and prevents the movement of the reflective sheet 30 from affecting the display effect.
  • one first side wall 311 of the reflective sheet 30 has two first protrusions 301, and the light bar 20 is located between the two first protrusions 301.
  • two first protrusions 301 are arranged on the first side wall 311, respectively located at the two ends of the light bar 20.
  • the two first protrusions 301 will both resist the light.
  • the end of the strip 20 enhances the limiting effect of the reflective sheet 30.
  • FIG. 5 is a partial schematic diagram of the backlight module provided in FIG. 1.
  • Figure 5 shows a partial schematic diagram of the lower left corner of Figure 1.
  • the first length L1 of the first protrusion 301 in the first direction is greater than the maximum expansion value of the reflective sheet 30 in the first direction at a predetermined temperature, and the first direction is the light bar opposite to the first protrusion 301
  • the extension direction of 20 is the direction a in FIG.
  • the length of the first protrusion 301 in the first direction is greater than 5 millimeters (mm).
  • the length of the first protrusion 301 in the first direction is limited, the size of the first protrusion 301 is ensured, the strength of the first protrusion 301 is ensured, and the end of the first protrusion 301 and the light bar 20 is avoided When it is offset, the end of the light bar 20 exerts too much pressure on the first protrusion 301, causing the first protrusion 301 to be damaged.
  • the maximum expansion value of the reflection sheet 30 in the first direction at a predetermined temperature refers to the length of the reflection sheet 30 in the first direction before expansion and the maximum length of the reflection sheet 30 in the first direction after expansion.
  • the predetermined temperature may be the temperature when the expansion value of the reflective sheet is the maximum in the working state of the backlight module.
  • the predetermined temperature is between 75 degrees Celsius and 85 degrees Celsius.
  • the first protrusion 301 is a columnar protrusion having opposite end surfaces and side surfaces connecting the end surfaces. One end surface is connected to the first side wall, and the other end surface is connected to the inner side wall of the frame. relatively.
  • the cross-section of the columnar protrusion may be rectangular, circular, polygonal, or the like.
  • the first protrusion 301 may also be a prism-shaped protrusion or the like, which is not limited in the present disclosure.
  • FIG. 6 is a partial top view of the backlight module provided in FIG. 4, and FIG. 6 is a partial top view of the lower left corner of FIG. 4.
  • FIG. 7 is a partial schematic diagram of the backlight module provided in FIG. 4, and FIG. 7 is a partial schematic diagram of the upper left corner of FIG. 4. Since there are two light bars in the embodiment shown in FIGS. 6 and 7, the extension direction of the first light bar 201 is the direction a, and the extension direction of the second light bar 202 is the direction b. Therefore, as shown in FIGS. 6 and 7 In the illustrated embodiment, both the a direction and the b direction are the aforementioned first directions.
  • the second length L2 of the first protrusion 301 in the second direction is less than the first distance L3, and the first distance L3 is the distance between the side of the light bar 20 away from the inner side wall and the inner side wall. spacing.
  • the second direction is perpendicular to the first direction, and the second direction is parallel to the surface of the reflective sheet 30.
  • the second length L2 of the first protrusion 301 is the size of the first protrusion 301 in the second direction.
  • the second length L2 of the first protrusion 301 is limited, so that the second length L2 of the first protrusion 301 is smaller than the first distance L3, so as to prevent the second length L2 of the first protrusion 301 from being too large, so that The first protrusion 301 abuts the inner side wall of the frame 102, causing the reflection sheet 30 to be deformed or damaged.
  • the first direction is the a direction
  • the second direction is the b direction
  • the first direction is the b direction.
  • the two directions are the a direction.
  • the second length L2 of the first protrusion 301 in the second direction is greater than 1.2 mm.
  • the second length L2 of the first protrusion 301 is limited, so that the second length L2 of the first protrusion 301 is not too small. In this way, during the movement of the reflective sheet 30, the first protrusion 301 It will not fall out of the distance between the end of the light bar 20 and the inner side wall of the frame 102, which ensures that it can play a limiting role in the extending direction of the light bar 20.
  • the light bar 20 is a long light bar.
  • the light bar 20 may be a light emitting diode (English: Light Emitting Diode, LED for short) light bar.
  • the light bar 20 includes an LED and a printed circuit board (English: Printed Circuit Board, PCB for short), and the LED is soldered on the PCB.
  • the control unit of the display panel sends a signal to the LED through the PCB to control the brightness of the LED, thereby controlling the opening and closing of the backlight module.
  • the PCB is a copper-clad aluminum substrate.
  • other forms of PCB may also be used, as long as the light bar can be electrically connected to the control unit.
  • the backlight module further includes a heat dissipation plate 60, and the heat dissipation plate 60 is located between the light bar 20 and the inner side wall of the frame 102 to which the light bar 20 faces.
  • the heat dissipation plate 60 is used to install the light bar 20 and fix the light bar 20 on the inner side wall of the frame 102.
  • the light bar 20 is bonded to the heat dissipation plate 60 through thermally conductive glue
  • the heat dissipation plate 60 is bonded to the inner side wall of the frame 102 through the heat conductive glue to fix the light bar 20 on the inner side wall of the frame 102.
  • the heat generated by the light bar 20 in the working process is conducted to the back plate 10 through the thermal conductive glue and the heat dissipation plate 60.
  • the back plate 10 conducts the heat into the air to dissipate the light bar 20 and avoid the backlight module caused by too high temperature. The group is damaged.
  • the heat dissipation plate 60 is an aluminum heat dissipation plate.
  • the aluminum heat sink has good thermal conductivity and can ensure the heat dissipation function of the heat sink 60.
  • the second length L2 of the first protrusion 301 is smaller than the sum of the thickness of the heat dissipation plate 60 and the thickness of the light bar 20 (the sum of the thickness is equal to the inner side where the light bar 20 is far away from The distance between one side of the wall and the inner side wall, that is, the first distance L3, prevents the first protrusion 301 from colliding with the inner side wall of the frame 102, which may cause distortion or damage to the reflective sheet 30.
  • the thickness of the heat dissipation plate 60 is between 2 mm and 2.5 mm.
  • the thickness of the heat dissipation plate 60 is 2 mm
  • the thickness of the light bar 20 is 1.7 mm
  • the second length L2 of the first protrusion 301 should be less than 3.7 mm.
  • the length of the first protrusion 301 may be 3 mm.
  • the first protrusion 301 has a slit 31 at the junction with the first side wall 311 where it is located. In the first direction, the slit 31 approaches the corresponding light bar 20 from the first protrusion 301. It extends to a position close to the middle of the first protrusion 301. Wherein, the slit 31 partially cuts off the connection between the first protrusion 301 and the first side wall 311.
  • the first protrusion 301 abuts the end of the light bar 20, and the end of the light bar 20 will squeeze the first protrusion 301.
  • a slit 31 is provided to partially cut off the connection between the first protrusion 301 and the first side wall 311, and the slit 31 is close to one end of the light bar 20.
  • the first protrusion 301 A protrusion 301 can be slightly tilted or folded, so that the first protrusion 301 has a certain degree of elasticity, so as to avoid damage to the first protrusion 301, and at the same time to prevent the reflection sheet 30 from being twisted and deformed due to the excessive pressing force of the first protrusion 301 Or damaged.
  • the reflective sheet 30 recovers, due to the certain hardness and elasticity of the reflective sheet 30, the first protrusion 301 will slowly return to its original state.
  • the length of the slit 31 is less than one-half of the first length L1 of the first protrusion 301, and is greater than the first length L1 of the first protrusion 301. One-third of the length L1.
  • the first length L1 of the first protrusion 301 is the size of the first protrusion 301 in the first direction.
  • the first protrusion 301 has a sufficient amount of folding to prevent the first protrusion 301 from being squeezed. Damage due to excessive force. At the same time, it is avoided that the slit 31 is too long to affect the connection strength of the first protrusion 301 and cause damage when the first protrusion 301 is folded.
  • the slit 31 and the boundary of the side of the reflective sheet 30 close to the light bar 20 are cut at the same time.
  • the slit 31 and the side wall 3011 of the first protrusion 301 close to the frame 102 are cut at the same time.
  • two parallel blades are used to simultaneously cut the side wall 3011 of the first protrusion 301 and the slit 31 of the first protrusion 301, with a certain distance between the two blades.
  • the length of the first protrusion 301 in the second direction should be greater than the distance between the two blades to facilitate the production of the slit 31.
  • the distance between the two blades can be related to the process accuracy. Therefore, the distance between the two blades can be determined first according to the process accuracy, and then based on the distance between the two blades, it is determined that the first protrusion 301 is in the first position. Length in both directions.
  • the distance between the first protrusion 301 and the light bar 20 ranges from 0.3 mm to 0.7 mm.
  • the reflector 30 has a certain amount of shrinkage.
  • the reflector 30 shrinks, it avoids the first protrusion.
  • the pressing force between the screw 301 and the end of the light bar 20 is too large, which causes the reflection sheet 30 to be twisted and deformed.
  • the distance between the first protrusion 301 and the light bar 20 may be 0.5 mm.
  • At least one second side wall 312 of the reflective sheet 30 has a second protrusion 302 facing the inner side wall of the frame 102.
  • the second protrusion 302 and the first protrusion 301 are located on different side walls.
  • the second protrusion 302 is arranged on the second side wall 312.
  • the second protrusion 302 contacts the inner side wall of the frame 102 to avoid excessive movement of the reflection sheet 30. Affect the display effect.
  • the second side wall 312 of the reflective sheet 30 will form a groove opposite to the second protrusion 302.
  • the spacing can provide a certain amount of expansion for the reflective sheet 30 to prevent the second side wall 312 of the reflective sheet 30 from completely offsetting the inner side wall of the frame 102, causing the reflective sheet 30 to be deformed or damaged.
  • the second protrusion 302 is a columnar protrusion.
  • the cross-section of the columnar protrusion may be rectangular, circular, polygonal, or the like.
  • the second protrusion 302 may also be a prism-shaped protrusion or the like, which is not limited in the present disclosure.
  • the second side wall 312 has two second protrusions 302 spaced apart.
  • two second protrusions 302 are arranged on the second side wall 312, and the second protrusions are arranged on the second side wall 312 at intervals to increase the limiting effect on the reflective sheet 30.
  • the reflective sheet 30 is prevented from tilting when it moves.
  • the second side wall 312 may also include one or more second protrusions 302.
  • FIG. 8 is a partial top view of a backlight module provided by an embodiment of the present disclosure.
  • the second protrusion 302 is located at the edge of the second side wall 312.
  • the distance between the second protrusion 302 and the inner side wall of the frame 102 opposite to the second protrusion 302 ranges from 0.3 mm to 0.7 mm, and the second protrusion 302 and The inner side wall of the frame 102 opposite to the second protrusion 302 is located on the same side of the reflective sheet 30.
  • the reflection sheet 30 there is a certain distance between the second protrusion 302 and the inner side wall of the frame 102, which, on the one hand, facilitates assembly.
  • the reflection sheet 30 expands, the size of the reflection sheet 30 becomes larger, and the distance between the second protrusion 302 and the frame 102 provides a certain space for the expansion of the reflection sheet 30 to avoid the reflection sheet 30 and the frame 102 In contrast, the reflection sheet 30 is damaged.
  • the distance between the second protrusion 302 and the inner side wall of the frame 102 opposite to the second protrusion 302 may be 0.5 mm. Since the ground side of the reflective sheet 30 directly contacts the light bar 20, that is, the reflective sheet 30 cannot move to the ground side. Therefore, the movable amount of the reflection sheet 30 in the left-right direction (longitudinal direction) is 1 mm, and the movable amount of the reflection sheet 30 in the vertical direction (lateral direction) is 0.5 mm.
  • the movable amount of the reflective sheet 30 can be used as the expansion margin of the reflective sheet 30 to prevent the reflective sheet 30 from colliding with the frame 102 and causing damage to the reflective sheet 30.
  • the reflection sheet 30 has an amount of movement in both the left-right direction and the up-down direction.
  • the area of the reflective sheet 30 on the right side of the display panel is reduced, and the light on the right side of the display panel becomes less, thereby darkening the right side;
  • the reflective sheet 30 moves to the right At this time, the area of the reflective sheet 30 on the left side of the display panel is reduced, and the light on the left side of the display panel becomes less, thereby darkening the left side; when the reflective sheet 30 moves upward, the reflective sheet 30 on the ground side of the display panel becomes darker.
  • the area of the display panel is reduced so that the ground side of the display panel is directly opposite to the light bar, which will affect the display effect of the ground side of the display panel, and make the light shadow appear on the ground side of the display panel.
  • the first protrusion 301 is arranged on the first side wall 311, which restricts the movement of the reflective sheet 30 and can avoid such phenomena.
  • the light bar 20 is a blue light bar.
  • FIG. 9 is a top view of a reflective sheet provided by an embodiment of the present disclosure.
  • the side of the reflective sheet 30 facing the light guide plate 40 has yellow ink 303, and the yellow ink 303 is located at the edge of the reflective sheet 30.
  • the yellow ink 303 is arranged on the edge of the reflective sheet.
  • the blue light reaches the edge of the reflective sheet 30, it becomes white light after passing through the yellow ink 303 on the reflective sheet 30, and is emitted from the edge of the display panel.
  • the blue color is not easy to be detected, even if the display panel leaks light, it is not easy to be detected, so as to avoid affecting the display effect.
  • blue light of the same intensity will be displayed as blue when it passes through a yellow ink with a lower density, and it will be displayed as yellow when it passes through a yellow ink with a higher density. Therefore, light of different intensities needs to be set with yellow inks of different densities to make The reflected light is white. Due to the structure of the light guide plate 40, the intensity of light emitted from different positions of the light guide plate to the reflective sheet is different. From the center of the light guide plate 40 to the edge of the light guide plate 40, the intensity of the light increases sequentially. In order to ensure that the reflected light is white, the density of the yellow ink 303 is set according to the intensity of the light, and the density of the yellow ink 303 closer to the frame is greater.
  • the yellow ink 303 moves accordingly.
  • the reflective sheet 30 moves to the left and the yellow ink 303 moves to the left.
  • the light intensity corresponding to the yellow ink area on the right decreases, which is equivalent to that the blue light passes through the denser yellow ink, making the light reflected by the yellow ink on the right yellow; the light intensity corresponding to the yellow ink area on the left increases, which is equivalent
  • the blue light passes through the yellow ink with a lower density, the light reflected by the yellow ink on the left becomes blue.
  • the first protrusion 301 can restrict the movement of the reflective sheet 30, this kind of phenomenon can be well improved, and the display effect of the display panel can be improved.
  • the yellow ink 303 may be arranged on the reflective sheet 30 by coating.
  • the first protrusion 301 can effectively prevent the yellow ink 303 on the edge of the reflective sheet 30 from moving to the effective display area (English: Active Area, abbreviation: AA), which improves the display uniformity of the display panel .
  • AA Active Area
  • the first protrusion 301 and the second protrusion 302 are mainly used to restrict the movement of the reflective sheet 30, so the yellow ink 303 is generally not arranged on the first protrusion 301 and the second protrusion 302.
  • the backlight module further includes an optical film 50.
  • the optical film 50 is located in the frame 102, and the light guide plate 40 is located between the reflective film 30 and the optical film 50.
  • the optical film 50 can reuse light to increase brightness, and at the same time, the optical film 50 can also reflect light, so that the light distribution on the light-emitting surface is more uniform, and the display effect of the display panel is improved.
  • the optical film 50 may include a diffusion sheet, a brightness enhancement sheet, and the like.
  • the optical film 50 is rectangular, which is convenient for placing the optical film 50 in the frame 102.
  • the backlight module provided by the embodiment of the present disclosure only optimizes the shape of the reflective sheet 30, the manufacturing process and materials are unchanged, and there is no need to increase the manufacturing cost, and it is easy to implement.
  • the embodiment of the present disclosure also provides a display panel, which includes a display substrate and the backlight module shown in any of the above-mentioned drawings.
  • the display substrate includes an array substrate and a color filter substrate arranged in pairs, and a liquid crystal layer located between the array substrate and the color filter substrate.
  • the light emitted by the backlight module sequentially passes through the array substrate and the liquid crystal substrate.
  • Layer and color film substrate are examples of the display substrate.
  • An embodiment of the present disclosure also provides a display device, which includes a power supply component and a display panel.
  • the display panel is the above-mentioned display panel
  • the power supply component is used for supplying power to the display panel.
  • the display device provided by the embodiment of the present disclosure may be a liquid crystal display device, an organic light emitting diode display device, a quantum dot display device, or the like.
  • the display device provided by the embodiment of the present disclosure may be any product or component with display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and so on.

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Abstract

本公开是关于一种背光模组、显示面板和显示装置，属于显示器领域。背光模组包括：背板、至少一个灯条和反射片。背板包括底板和围绕底板的边框；至少一个灯条固定在边框的内侧壁上，在灯条的延伸方向上，灯条的端部与边框的内侧壁之间具有间隙；反射片位于边框中，且位于底板上，反射片的至少一个第一侧壁具有至少一个第一凸起，第一凸起从所在的第一侧壁朝向与所在的第一侧壁相对的边框的内侧壁延伸，第一凸起位于间隙内。当反射片移动时，第一凸起会抵挡在灯条的端部上，对反射片的移动范围进行限制，避免反射片的移动量过大使反射片能够反射光的区域减小，保证了光的出射量和显示均一性，增强了显示面板的显示亮度和显示效果。

Description

背光模组、显示面板和显示装置
本公开要求于2020年06月22日提交的申请号为202021173417.5、实用新型名称为“背光模组和显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及显示器领域，特别涉及一种背光模组、显示面板和显示装置。
背景技术
侧入式背光模组是一种常用的背光模组，侧入式背光模组包括背板、灯条和反射片，背板包括底板和围绕底板的边框，灯条位于边框的内侧壁上，反射片位于边框内且位于底板上，灯条与反射片的一条边相对设置。灯条发出的光从侧入式背光模组的发光面射出，部分未能从发光面射出的光会到达反射片，反射片将光反射，使光再次从侧入式背光模组的发光面射出，提高显示亮度。
实用新型内容
本公开实施例提供了一种背光模组、显示面板和显示装置，避免反射片在收缩时移动范围过大，影响显示面板的显示亮度和显示效果。所述技术方案如下：
一方面，本公开提供了一种背光模组，所述背光模组包括：
背板，包括底板和围绕所述底板的边框；至少一个灯条，固定在所述边框的内侧壁上，在所述灯条的延伸方向上，所述灯条的端部与所述边框的内侧壁之间具有间隙；反射片，位于所述边框中，且位于所述底板上，所述反射片的至少一个第一侧壁具有至少一个第一凸起，所述第一凸起从所在的所述第一侧壁朝向与所在的所述第一侧壁相对的所述边框的内侧壁延伸，所述第一凸起位于所述间隙内。
在本公开实施例的一种实现方式中，所述第一凸起与所在的所述第一侧壁的连接处具有切缝，在第一方向上，所述切缝从所述第一凸起靠近对应的所述灯条的一侧，延伸至所述第一凸起的中部，所述第一方向是与所述第一凸起相 对的所述灯条的延伸方向。
在本公开实施例的一种实现方式中，所述第一侧壁具有两个所述第一凸起，所述灯条位于两个所述第一凸起之间。
在本公开实施例的一种实现方式中，在所述第一方向上，所述切缝的长度小于所述第一凸起的第一长度的二分之一，且大于所述第一凸起的所述第一长度的三分之一。
在本公开实施例的一种实现方式中，在所述第一方向上，所述第一凸起的第一长度大于所述反射片在预定温度下的最大膨胀值，所述第一凸起与所述第一凸起相对的所述灯条位于所述反射片的同一侧。
在本公开实施例的一种实现方式中，所述第一凸起的第二长度小于第一间距，所述第一间距为在第二方向上所述灯条远离所在的内侧壁的一面与所述内侧壁之间的间距；所述第二方向与所述第一方向垂直，且所述第二方向与所述反射片的表面平行。
在本公开实施例的一种实现方式中，所述第二长度大于1.2毫米。
在本公开实施例的一种实现方式中，在所述第一方向上，所述第一凸起与所述灯条之间的间距范围为0.3毫米至0.7毫米。
在本公开实施例的一种实现方式中，所述灯条的数量和所述第一侧壁的数量均为1。
在本公开实施例的一种实现方式中，所述至少一个灯条包括第一灯条和第二灯条，所述第一灯条和所述第二灯条分别位于所述边框的两条相邻边的内侧壁上；所述至少一个第一侧壁包括相邻且相互连接的两个第一侧壁，所述两个第一侧壁分别与所述第一灯条和所述第二灯条相对。
在本公开实施例的一种实现方式中，所述反射片的至少一个第二侧壁具有朝向所述边框的内侧壁的第二凸起；所述第二凸起和所述第一凸起位于不同的侧壁上。
在本公开实施例的一种实现方式中，所述第二侧壁具有两个间隔设置的所述第二凸起。
在本公开实施例的一种实现方式中，所述第二凸起和所述第二凸起相对的所述边框的内侧壁之间的间距范围为0.3毫米至0.7毫米，所述第二凸起和所述第二凸起相对的所述边框的内侧壁位于所述反射片的同一侧。
在本公开实施例的一种实现方式中，所述背光模组还包括：导光板，位于所述边框中，所述导光板、所述反射片和所述底板依次层叠。
在本公开实施例的一种实现方式中，所述灯条为蓝光灯条，所述反射片朝向所述导光板的一面有黄色油墨，所述黄色油墨位于所述反射片的边缘。
在本公开实施例的一种实现方式中，所述背光模组还包括：光学膜片，位于所述边框内，所述导光板位于所述反射片和所述光学膜片之间。
在本公开实施例的一种实现方式中，所述光学膜片包括扩散片和增亮片中的至少一种。
在本公开实施例的一种实现方式中，所述背光模组还包括：散热板，位于所述灯条和所述灯条朝向的边框的内侧壁之间。
另一方面，本公开提供了一种显示面板，所述显示面板包括：显示基板，以及上述任一方面所述的背光模组。
另一方面，本公开提供了一种显示装置，所述显示装置包括供电组件，以及上述任一方面所述的显示面板，所述供电组件用于为所述显示面板供电。
附图说明
图1是本公开实施例提供的一种背光模组的俯视图；
图2是图1中A-A面的截面图；
图3是本公开实施例提供的一种背光模组的截面图；
图4是本公开实施例提供的另一种背光模组的俯视图；
图5是图1提供的背光模组的局部示意图；
图6是图4提供的背光模组的局部示意图；
图7是图4提供的背光模组的局部示意图；
图8是本公开实施例提供的一种背光模组的局部俯视图；
图9是本公开实施例提供的一种反射片的俯视图。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本公开 实施方式作进一步地详细描述。
在相关技术中，反射片与边框的内侧壁有一定的间距。当反射片膨胀时，反射片的尺寸变大，反射片与边框的内侧壁之间的间距为反射片的膨胀提供了一定的空间，避免反射片与背板的边框相抵，造成反射片损坏。
在研究中发现，反射片是在高温条件下通过拉伸制作而成的，所以反射片在高温时会收缩，并且反射片在不同方向上收缩量不同。
以65寸的反射片为例，65寸的反射片的长为1440毫米，65寸的反射片的宽为810毫米。反射片在80摄氏度(℃)的温度中会收缩，其中，反射片在纵向(英文：Machine Direction，简称：MD)上的收缩值(收缩前的长度和收缩后的长度的差值)为4.32毫米，收缩率(收缩值与收缩前的长度的比值)为0.30％；反射片在横向(英文：Transverse Direction，简称：TD)方向上的收缩值为0.648毫米，收缩率为0.08％。
虽然，反射片与边框的内侧壁之间的间隙能够避免反射片膨胀造成的反射片损坏。但是当反射片收缩时，反射片与边框的内侧壁之间的间距会增大，导致反射片的移动范围过大。当反射片移动时，可能会使反射片能够反射光的区域减小，不但影响光的出射量，同时会造成显示不均一，从而影响显示面板的显示亮度和显示效果。
图1是本公开实施例提供的一种背光模组的俯视图。参见图1，背光模组包括：背板10、灯条20、反射片30。
其中，背板10包括底板101和围绕底板101的边框102。灯条20固定在边框102的内侧壁上，在灯条20的延伸方向上，灯条20的端部与边框102的内侧壁之间具有间隙(英文：Gap)103。反射片30位于边框102中，且位于底板101上，反射片30的第一侧壁311具有至少一个第一凸起301，第一凸起301从所在的第一侧壁311朝向与所在的第一侧壁311相对的边框102的内侧壁延伸，第一凸起301位于间隙103内。
图2是图1中A-A面的截面图。参见图2，反射片30位于底板101上，底板101和边框102形成了容置空间104，灯条20和反射片30具位于该容置空间104内。
在本公开实施例中，反射片位于背板的边框中，在反射片收缩时，反射片 的四周会向反射片的中心内缩，使反射片的尺寸变小，反射片与边框的内侧壁之间的间距变大，反射片可移动的范围较大。当反射片的移动超过一定范围时，反射片与反射片一侧的导光板的重叠区域变小，使得反射片能够反射光的区域减小，影响光的出射量，造成显示效果不均一。在反射片的第一侧壁上布置第一凸起，且第一凸起位于灯条的端部与边框的内侧壁之间的间隙内，当反射片在灯条的延伸方向上的移动时，第一凸起会抵挡在灯条的端部上，从而通过灯条对反射片的移动范围进行限制，避免反射片的移动量过大使反射片能够反射光的区域减小，从而保证了光的出射量和显示均一性，增强了显示面板的显示亮度和显示效果。
图3是本公开实施例提供的一种背光模组的截面图。参见图3，背光模组还包括导光板40。导光板40位于边框102中，导光板40、反射片30和底板101依次层叠，也即是，反射片30位于底板101和导光板40之间。
在本公开实施例中，背板10的底板101用于支撑反射片30和导光板40等结构，背板10的边框102用于安装灯条20。灯条20固定在边框102的内侧壁上，灯条20的出光面朝向导光板40，导光板40将灯条20发出的光转化为面光源，使显示面板的出光面的光分布更加均匀，提升显示效果。反射片30位于导光板40的下方，当经过导光板40的部分光到达反射片30时，反射片30将光反射，使光再次到达导光板40，并从导光板40射出，提高显示亮度。
在本公开实施例中，灯条20固定在边框102的内侧壁上，即灯条20发出的光是从导光板40的侧面进入导光板40中的，该背光模组为侧入式背光模组。
示例性地，在本公开实施例中，底板101为矩形底板，边框102为矩形的边框，边框102沿底板101的边缘布置。在其他实施例中，底板101和边框102还可以是其他形状，例如，圆形底板和圆环形边框等等，本公开对此不做限制。
可选地，底板101和边框102可以是一体成型结构，或者，通过焊接等方式将底板101和边框102固定在一起。
在本公开实施例中，灯条20可以通过粘接等方式固定在边框102的内侧壁上。
在本公开实施例中，反射片30和导光板40的形状与底板和边框的形状相匹配，例如，当底板101为矩形底板，边框102为矩形的边框时，导光板40也呈矩形，反射片30近似矩形。
可选地，反射片可以是金属反射片。导光板40可以是聚甲基丙烯酸甲酯导光板或聚碳酸酯制成的导光板。
可选地，反射片30具有反射面和与反射面连接的侧壁，该反射面可以是反射片30之与导光板40相对的表面，反射片30的侧壁与边框的内侧壁相对。在本公开实施例中，第一凸起301位于反射片30的至少一个侧壁上。
在一种可能的实施方式中，背光模组仅具有一个灯条20，反射片30仅一个侧壁具有第一凸起301。
如图1所示，灯条20的数量和第一侧壁311的数量均为1。灯条20为第一灯条201。第一凸起301位于第一侧壁311上，第一灯条201的端部与边框102的内侧壁之间具有间隙103，第一凸起301位于间隙103内。
在该实现方式中，背光模组中布置有一个灯条，为第一灯条201，在与第一灯条201对应的第一侧壁311上布置第一凸起301，当反射片30在第一灯条201的延伸方向上移动时，第一凸起301会抵挡在第一灯条201的端部上，避免反射片30在第一灯条201的延伸方向上的移动量过大，避免影响显示面板的显示亮度和显示效果。
在本公开实施例中，当背光模组只设置一个灯条，为第一灯条201时，反射片30的纵向方向与第一灯条201的延伸方向一致，也即反射片30在第一灯条201的延伸方向上的收缩更为明显，所以将第一凸起301布置在与第一灯条201对应的第一侧壁311上，可以限制反射片30在第一灯条201的延伸方向上的移动，在第一灯条201的延伸方向限制反射片30的移动，可以避免反射片30受热收缩过大导致的反射片30移动量过大，造成的显示问题。
在本公开实施例的另一种实施方式中，背光模组具有两个灯条20，分别位于边框102的相邻的两条边的内侧壁上，相应的，反射片30与这两个内侧壁相对的侧壁上均具有第一凸起301。
图4是本公开实施例提供的另一种背光模组的俯视图。参见图4，灯条20可以包括第一灯条201和第二灯条202，第一灯条201和第二灯条202分别位于边框102的两条相邻边的内侧壁上。
其中，第一侧壁311包括相邻且相互连接的两个第一侧壁311，两个第一侧壁311分别与第一灯条201和第二灯条202相对。
如图4所示，第一灯条201的端部与边框102的内侧壁之间具有间隙103， 第一灯条201对应的第一侧壁311上的第一凸起301位于该间隙103内，第二灯条202的端部与边框102的内侧壁之间也具有间隙103，第二灯条202对应的第一侧壁311上的第一凸起301位于该间隙103内。
在该实现方式中，背光模组中布置有两个灯条20，分别为第一灯条201和第二灯条202，可以提高显示面板的亮度。且在第一灯条201对应的第一侧壁311上布置第一凸起301，在第二灯条202对应的第一侧壁311上也布置第一凸起301，当反射片30在第一灯条201的延伸方向上移动时，第一灯条201对应的第一侧壁311的第一凸起301会抵挡在第一灯条201的端部上，当反射片30在第二灯条202的延伸方向上移动时，第二灯条202对应的第一侧壁311的第一凸起301会抵挡在第二灯条202的端部上。第一灯条201和第二灯条202分别位于边框102两条相邻的内侧壁上，也即第一灯条201的延伸方向和第二灯条202的延伸方向不同，可以同时从两个方向上限制反射片30的移动，对反射片30的限制效果更好。
在本公开实施例中，第一灯条201的延伸方向与反射片30的纵向方向一致，第二灯条202的延伸方向与反射片30的横向方向一致，同时在纵向方向和横向方向上限制反射片30的移动，加强对反射片30的限制效果，避免反射片30移动影响显示效果。
再次参见图1和图4，反射片30的一个第一侧壁311上具有两个第一凸起301，灯条20位于两个第一凸起301之间。
在该实现方式中，在第一侧壁311上布置两个第一凸起301，分别位于灯条20的两端，在反射片30移动时，两个第一凸起301均会抵挡在灯条20的端部，增强对反射片30的限位效果。
图5是图1提供的背光模组的局部示意图。图5所示的是图1中左下角的局部示意图。
参见图5，第一凸起301在第一方向上的第一长度L1大于反射片30在预定温度下第一方向上的最大膨胀值，第一方向是与第一凸起301相对的灯条20的延伸方向，也即是图5中的a方向，第一凸起301与第一凸起301相对的灯条20位于反射片30的同一侧。例如，对于65寸的反射片，第一凸起301在第一方向上的长度大于5毫米(mm)。
在该实现方式中，限制第一凸起301在第一方向上的长度，保证第一凸起 301的尺寸，保证第一凸起301强度，避免第一凸起301与灯条20的端部相抵时，灯条20的端部对第一凸起301的压力过大，造成第一凸起301损坏。
在本公开实施例中，反射片30在预定温度下第一方向上的最大膨胀值指，反射片30膨胀前在第一方向上的长度与反射片30膨胀后在第一方向上的最大长度的差值。这里，预定温度可以是在背光模组工作状态下，反射片膨胀值最大时的温度。例如，预定温度在75摄氏度至85摄氏度之间。
在本公开实施例中，第一凸起301为柱状凸起，该柱状凸起具有相对的两端面以及连接两端面的侧面，一个端面与第一侧壁连接，另一个端面与边框的内侧壁相对。示例性地，该柱状凸起的横截面可以为矩形、圆形、多边形等。在其他实现方式中，第一凸起301还可以为棱台状凸起等等，本公开对此不做限定。
图6是图4提供的背光模组的局部俯视图，图6是图4左下角的局部俯视图。图7是图4提供的背光模组的局部示意图，图7所示的是图4中左上角的局部示意图。由于图6和图7所示实施例中存在两个灯条，第一灯条201的延伸方向为a方向，第二灯条202的延伸方向为b方向，因此，在图6和图7所示实施例中，a方向和b方向均为前述第一方向。
再次参见图5至图7，第一凸起301在第二方向上的第二长度L2小于第一间距L3，第一间距L3为灯条20远离所在的内侧壁的一面与内侧壁之间的间距。第二方向与第一方向垂直，且第二方向与反射片30的表面平行。
在本公开实施例中，第一凸起301的第二长度L2为第一凸起301在第二方向上的尺寸。
在该实现方式中，限定第一凸起301的第二长度L2，使第一凸起301的第二长度L2小于第一间距L3，避免第一凸起301的第二长度L2过大，使第一凸起301与边框102的内侧壁相抵，造成反射片30扭曲变形或损坏。
如图5至图7所示，当第一凸起301所处的位置不同时，其对应的第一方向和第二方向的方向也会不同。对于第一灯条201对应的第一凸起301，第一方向为a方向，第二方向为b方向，对于第二灯条202对应的第一凸起301，第一方向为b方向，第二方向为a方向。
在本公开实施例的一种实现方式中，第一凸起301在第二方向上的第二长度L2大于1.2毫米。
在该实现方式中，限定第一凸起301的第二长度L2，使得第一凸起301的第二长度L2不至于过小，这样，在反射片30移动的过程中，第一凸起301不会从灯条20的端部与边框102的内侧壁之间的间距脱出，保证能起到在灯条20的延伸方向上的限位作用。
在本公开实施例中，灯条20是长条形的灯条，示例性地，灯条20可以是发光二极管(英文：Light Emitting Diode，简称：LED)灯条。灯条20包括LED和印刷线路板(英文：Printed Circuit Board，简称：PCB)，LED焊接在PCB上。显示面板的控制单元通过PCB向LED发送信号，控制LED的亮暗，从而控制背光模组的打开与关闭。
可选地，PCB为覆铜铝基板。在其他实施例中，也可以采用其他形式的PCB，只要能实现灯条与控制单元的电连接即可。
再次参见图1至图7，可选地，背光模组还包括散热板60，散热板60位于灯条20和该灯条20所朝向的边框102的内侧壁之间。
散热板60用于安装灯条20，将灯条20固定在边框102的内侧壁上。
可选地，灯条20通过导热胶与散热板60粘接，散热板60再通过导热胶与边框102的内侧壁粘接，将灯条20固定在边框102的内侧壁上。同时灯条20在工作过程中产生的热量通过导热胶和散热板60传导到背板10上，背板10将热量传导到空气中，对灯条20进行的散热，避免温度太高造成背光模组损坏。
可选地，散热板60是铝制散热板。铝制散热板的导热性能好，能够保证散热板60的散热功能。
在本公开实施例中，在第二方向上，第一凸起301的第二长度L2小于散热板60的厚度和灯条20的厚度之和(该厚度之和等于灯条20远离所在的内侧壁的一面与该内侧壁之间的间距，也即第一间距L3)，避免第一凸起301与边框102的内侧壁相抵，造成反射片30扭曲变形或损坏。
示例性地，在第二方向上，散热板60的厚度在2毫米至2.5毫米之间。
例如，在第二方向上，散热板60的厚度为2毫米，灯条20的厚度为1.7毫米，第一凸起301的第二长度L2应小于3.7毫米。例如，第一凸起301的长度可以为3毫米。
再次参见图5至图7，第一凸起301与所在的第一侧壁311的连接处具有切缝31，在第一方向上，切缝31从第一凸起301靠近对应的灯条20的一侧，延 伸至接近第一凸起301的中部的位置。其中，切缝31将第一凸起301与第一侧壁311的连接处部分切断。
在该实现方式中，当反射片30收缩时，第一凸起301与灯条20的端部相抵，灯条20的端部会对第一凸起301造成挤压。设置切缝31将第一凸起301与第一侧壁311的连接处部分切断，且切缝31靠近灯条20的一端，在灯条20的端部挤压第一凸起301时，第一凸起301可以轻微翘起或者折叠，使得第一凸起301具有一定的弹性，避免第一凸起301损坏，同时避免第一凸起301受到的挤压力过大造成反射片30扭曲变形或损坏。当反射片30恢复时，由于反射片30存在一定的硬度和弹性，第一凸起301会慢慢恢复至原来的状态。
在本公开实施例的一种实现方式中，在第一方向上，切缝31的长度小于第一凸起301的第一长度L1的二分之一，且大于第一凸起301的第一长度L1的三分之一。
在本公开实施例中，第一凸起301的第一长度L1为第一凸起301在第一方向上的尺寸。
在该实现方式中，通过限制切缝31的长度，保证切缝31的长度，在反射片30收缩的过程中，第一凸起301有足够的折叠量，避免第一凸起301由于挤压力过大损坏。同时又避免切缝31太长影响第一凸起301的连接强度，导致第一凸起301折叠时损坏。
在本公开实施例中，切缝31和反射片30靠近灯条20的一侧(一般称为地侧)的边界是同时切割的。如图1所示，在对反射片的边界进行切割时，切缝31和第一凸起301靠近边框102的侧壁3011是同时切割的。在切割时，采用两块平行的刀片同时对第一凸起301的侧壁3011和第一凸起301的切缝31进行切割，两块刀片之间具有一定的间距。当设置切缝31时，第一凸起301在第二方向上的长度应大于两块刀片之间的间距，方便制作切缝31。
示例性地，两块刀片之间的间距可以与工艺精度相关，故可以先根据工艺精度确定两块刀片之间的间距，然后基于两块刀片之间的间距确定出第一凸起301在第二方向上的长度。
在本公开实施例的一种实现方式中，在第一方向上，第一凸起301与灯条20之间的间距范围在0.3毫米至0.7毫米之间。
在该实现方式中，第一凸起301与灯条20之间具有间距，一方面便于组装， 另一方面，保证反射片30有一定的收缩量，在反射片30收缩时，避免第一凸起301与灯条20端部之间的抵压力过大，造成反射片30扭曲变形。
示例性地，第一凸起301与灯条20之间的间距可以是0.5毫米。
再次参见图1和图4，反射片30的至少一个第二侧壁312具有朝向边框102的内侧壁的第二凸起302。第二凸起302和第一凸起301位于不同的侧壁上。
在该实现方式中，在第二侧壁312上布置第二凸起302，当反射片30移动时，第二凸起302与边框102的内侧壁接触，避免反射片30的移动范围过大，影响显示效果。
同时由于第二凸起302的存在，反射片30的第二侧壁312会形成相对第二凸起302的凹槽，凹槽与边框102的内侧壁之间一定的间距，在反射片30膨胀时，该间距可以为反射片30提供一定的膨胀量，避免反射片30的第二侧壁312完全与边框102的内侧壁相抵，造成反射片30扭曲变形或损坏。
在本公开实施例中，第二凸起302为柱状凸起。示例性地，该柱状凸起的横截面可以为矩形、圆形、多边形等。在其他实现方式中，第二凸起302还可以为棱台状凸起等等，本公开对此不做限定。
再次参见图1和图4，第二侧壁312具有两个间隔设置的第二凸起302。
在该实现方式中，在第二侧壁312上布置两个第二凸起302，且第二凸起间隔布置在第二侧壁312上，增加对反射片30的限位作用。同时避免反射片30在移动时发生倾斜。
在其他实现方式中，在第二侧壁312也可以包括一个或多个第二凸起302。
图8是本公开实施例提供的一种背光模组的局部俯视图。参见图8，第二凸起302位于第二侧壁312的边缘。
在本公开实施例的一种实现方式中，第二凸起302和第二凸起302相对的边框102的内侧壁之间的间距范围在0.3毫米至0.7毫米之间，第二凸起302和第二凸起302相对的边框102内侧壁位于反射片30的同一侧。
在该实现方式中，第二凸起302与边框102的内侧壁有一定的间距，一方面，便于组装。另一方面，当反射片30膨胀时，反射片30的尺寸变大，第二凸起302与边框102之间的间距为反射片30的膨胀提供了一定的空间，避免反射片30与边框102相抵，造成反射片30损坏。
示例性地，第二凸起302和第二凸起302相对的边框102的内侧壁之间的 间距可以是0.5毫米。由于反射片30的地侧直接与灯条20接触，也即反射片30无法向地侧移动。所以反射片30在左右方向(纵向方向)上的可移动量为1毫米，反射片30在上下方向(横向方向)上的可移动量为0.5毫米。
在本公开实施例中，反射片30的可移动量可以作为反射片30的膨胀余量，避免反射片30时与边框102相抵，造成反射片30损坏。
在相关技术中，反射片30在左右方向和上下方向上均具有活动量。当反射片30向左侧移动时，会使显示面板右侧的反射片30的面积减小，使显示面板右侧的光变少，从而使右侧变暗；当反射片30向右侧移动时，会使显示面板左侧的反射片30的面积减小，使显示面板左侧的光变少，从而使左侧变暗；当反射片30向上移动时，显示面板地侧的反射片30的面积减小，使显示面板地侧直接与灯条相对，会影响显示面板地侧的显示效果，使显示面板地侧出现灯影。本公开实施例提供的背光模组，在第一侧壁311上布置了第一凸起301，限制了反射片30的移动，可以避免此类现象发生。
在本公开实施例的一种实现方式中，灯条20为蓝光灯条。
图9是本公开实施例提供的一种反射片的俯视图。参见图9，反射片30朝向导光板40的一面有黄色油墨303，且黄色油墨303位于所述反射片30的边缘。
在该实现方式中，黄色油墨303设置在反射片的边缘，蓝光到达反射片30的边缘时，经过反射片30上的黄色油墨303后变为白光，并从显示面板的边缘射出，白光相对于蓝色不易被察觉，即使显示面板漏光，也不易被察觉，避免影响显示效果。
在相关技术中，同一强度的蓝光通过密度较小的黄色油墨时会显示为蓝色，通过密度较大的黄色油墨时会显示为黄色，因此不同强度的光需要设置不同密度的黄色油墨才能使得反射后的光呈白色。由于导光板40的结构的原因，从导光板的不同位置出射到反射片上的光的强度是不一样的，从导光板40的中心到导光板40的边缘的方向，光的强度依次增强。为保证反射后的光呈白色，会根据光的强度设置黄色油墨303的密度，越靠近边框的黄色油墨303的密度越大。
当反射片30反射移动时，黄色油墨303随之移动，例如，反射片30向左移动，黄色油墨303向左移动。移动后，右侧黄色油墨区域对应的光强减小，相当于蓝光经过密度较大的黄色油墨，使右侧黄色油墨反射的光发黄；左侧黄色油墨区域对应的光强增大，相当于蓝光经过密度较小的黄色油墨，使左侧黄 色油墨反射的光发蓝。在本公开实施例中，由于第一凸起301可以限制反射片30的移动，可以很好地改善此类现象，提高显示面板的显示效果。
示例性地，黄色油墨303可以通过涂布的方式布置在反射片30上。
同时，对于蓝光量子点背光模组，第一凸起301可以有效防止反射片30边缘的黄色油墨303移动至有效显示区域(英文：Active Area，简称：AA)，提高了显示面板的显示均一性。
如图9所示，第一凸起301和第二凸起302主要是用于限制反射片30的移动，所以第一凸起301和第二凸起302上一般不布置黄色油墨303。
再次参见图3，背光模组还包括光学膜片50。光学膜片50位于所述边框102内，导光板40位于反射片30和光学膜片50之间。
在该实现方式中，光学膜片50可以将光重新利用增加亮度，同时光学膜片50还可将光反射，使出光面的光分布更加均匀，提高显示面板的显示效果。
示例性地，光学膜片50可以包括扩散片、增亮片等。
在本公开实施例中，光学膜片50均为矩形，便于将光学膜片50放置在边框102中。
本公开实施例提供的背光模组，只对反射片30的形状进行优化，制作工艺和材料均没有变化，无需增加制作成本，且易于实现。
本公开实施例还提供了一种显示面板，显示面板包括显示基板，以及上述任一附图所示的背光模组。
示例性地，该显示基板包括对盒设置的阵列基板和彩膜基板、以及位于阵列基板和彩膜基板之间的液晶层，显示面板显示时，背光模组射出的光依次经过阵列基板、液晶层和彩膜基板。
本公开实施例还提供了一种显示装置，所述显示装置包括供电组件以及显示面板。其中，显示面板为上述所述的显示面板，供电组件用于为显示面板供电。
本公开实施例提供的显示装置可以是液晶显示装置、有机发光二极管显示装置或量子点显示装置等。在具体实施时，本公开实施例提供的显示装置可以为手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何 具有显示功能的产品或部件。
以上所述仅为本公开的可选实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (20)

  1. 一种背光模组，所述背光模组包括：
    背板(10)，包括底板(101)和围绕所述底板(101)的边框(102)；
    至少一个灯条(20)，固定在所述边框(102)的内侧壁上，在所述灯条(20)的延伸方向上，所述灯条(20)的端部与所述边框(102)的内侧壁之间具有间隙(103)；
    反射片(30)，位于所述边框(102)中，且位于所述底板(101)上，所述反射片(30)的至少一个第一侧壁(311)具有至少一个第一凸起(301)，所述第一凸起(301)从所在的所述第一侧壁(311)朝向与所在的所述第一侧壁(311)相对的所述边框(102)的内侧壁延伸，所述第一凸起(301)位于所述间隙(103)内。
  2. 根据权利要求1所述的背光模组，所述第一凸起(301)与所在的所述第一侧壁(311)的连接处具有切缝(31)，在第一方向上，所述切缝(31)从所述第一凸起(301)靠近对应的所述灯条(20)的一侧，延伸至所述第一凸起(301)的中部，所述第一方向是与所述第一凸起(301)相对的所述灯条(20)的延伸方向。
  3. 根据权利要求1或2所述的背光模组，所述第一侧壁(311)具有两个所述第一凸起(301)，所述灯条(20)位于两个所述第一凸起(301)之间。
  4. 根据权利要求2所述的背光模组，在所述第一方向上，所述切缝(31)的长度小于所述第一凸起(301)的第一长度(L1)的二分之一，且大于所述第一凸起(301)的所述第一长度(L1)的三分之一。
  5. 根据权利要求2所述的背光模组，在所述第一方向上，所述第一凸起(301)的第一长度(L1)大于所述反射片(30)在预定温度下的最大膨胀值，所述第一凸起(301)与所述第一凸起(301)相对的所述灯条(20)位于所述反射片(30)的同一侧。
  6. 根据权利要求2所述的背光模组，在第二方向上，所述第一凸起(301)的第二长度(L2)小于第一间距(L3)，所述第一间距(L3)为在第二方向上所述灯条(20)远离所在的内侧壁的一面与所述内侧壁之间的间距；
    所述第二方向与所述第一方向垂直，且所述第二方向与所述反射片(30)的表面平行。
  7. 根据权利要求6所述的背光模组，所述第二长度(L2)大于1.2毫米。
  8. 根据权利要求5所述的背光模组，在所述第一方向上，所述第一凸起(301)与所述灯条(20)之间的间距范围为0.3毫米至0.7毫米。
  9. 根据权利要求1至8任一项所述的背光模组，所述灯条(20)的数量和所述第一侧壁(311)的数量均为1。
  10. 根据权利要求1至8任一项所述的背光模组，所述至少一个灯条(20)包括第一灯条(201)和第二灯条(202)，所述第一灯条(201)和所述第二灯条(202)分别位于所述边框(102)的两条相邻边的内侧壁上；
    所述至少一个第一侧壁(311)包括相邻且相互连接的两个第一侧壁(311)，所述两个第一侧壁(311)分别与所述第一灯条(201)和所述第二灯条(202)相对。
  11. 根据权利要求1至10任一项所述的背光模组，所述反射片(30)的至少一个第二侧壁(312)具有朝向所述边框(102)的内侧壁的第二凸起(302)；
    所述第二凸起(302)和所述第一凸起(301)位于不同的侧壁上。
  12. 根据权利要求11所述的背光模组，所述第二侧壁(312)具有两个间隔设置的所述第二凸起(302)。
  13. 根据权利要求11所述的背光模组，所述第二凸起(302)和所述第二凸起(302)相对的所述边框(102)的内侧壁之间的间距范围为0.3毫米至0.7毫米，所述第二凸起(302)和所述第二凸起(302)相对的所述边框(102)的内侧壁位于所述反射片(30)的同一侧。
  14. 根据权利要求1至13任一项所述的背光模组，所述背光模组还包括：
    导光板(40)，位于所述边框(102)中，所述导光板(40)、所述反射片(30)和所述底板(101)依次层叠。
  15. 根据权利要求14所述的背光模组，所述灯条(20)为蓝光灯条，所述反射片(30)朝向所述导光板(40)的一面有黄色油墨(303)，所述黄色油墨(303)位于所述反射片(30)的边缘。
  16. 根据权利要求14所述的背光模组，所述背光模组还包括：
    光学膜片(50)，位于所述边框(102)内，所述导光板(40)位于所述反射片(30)和所述光学膜片(50)之间。
  17. 根据权利要求16所述的背光模组，所述光学膜片(50)包括扩散片和 增亮片中的至少一种。
  18. 根据权利要求1至17任一项所述的背光模组，所述背光模组还包括：
    散热板(60)，位于所述灯条(20)和所述灯条(20)朝向的边框(102)的内侧壁之间。
  19. 一种显示面板，所述显示面板包括：显示基板，以及如权利要求1至18任一项所述的背光模组。
  20. 一种显示装置，所述显示装置包括供电组件，以及如权利要求19所述的显示面板，所述供电组件用于为所述显示面板供电。
PCT/CN2021/098438 2020-06-22 2021-06-04 背光模组、显示面板和显示装置 WO2021259044A1 (zh)

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