WO2019076101A1 - 侧面入射式背光模组和显示装置 - Google Patents

侧面入射式背光模组和显示装置 Download PDF

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Publication number
WO2019076101A1
WO2019076101A1 PCT/CN2018/099182 CN2018099182W WO2019076101A1 WO 2019076101 A1 WO2019076101 A1 WO 2019076101A1 CN 2018099182 W CN2018099182 W CN 2018099182W WO 2019076101 A1 WO2019076101 A1 WO 2019076101A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
preventing member
backlight module
leakage preventing
Prior art date
Application number
PCT/CN2018/099182
Other languages
English (en)
French (fr)
Inventor
孙彦军
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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.)
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Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US16/328,880 priority Critical patent/US11262615B2/en
Publication of WO2019076101A1 publication Critical patent/WO2019076101A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a side-incident type backlight module and a display device.
  • the backlight module is an important component of the liquid crystal display, and the backlight module is used to provide a sufficient and uniform planar backlight for the liquid crystal display.
  • Common backlight modules mainly include a plastic frame, a back plate, a light source, a light guide plate, and an optical film.
  • the back plate, the light source, the light guide plate and the optical film are located in the plastic frame.
  • the backlight module is divided into a side-incidence backlight module and a bottom-incidence backlight module.
  • the side-incident backlight module generally adopts a light bar on the side of the plastic frame as a light bar. light source.
  • the light emitting surface of the light source faces the light incident surface of the light guide plate, and the light emitted by the light source is transmitted and reflected by the light guide plate to be irradiated onto the liquid crystal panel.
  • some of the light emitted by the light source fails to enter the light guide plate, that is, there is a light leakage phenomenon, resulting in a decrease in light efficiency.
  • a side-incident backlight module includes: a light guide plate;
  • a light bar disposed on a side of the light incident surface of the light guide plate and including a light emitting member
  • the light leakage preventing member is located between the light bar and the light guide plate, and extends along a width direction of the light guide plate, the light leakage preventing member includes at least one groove, and the opening of the groove Facing the light bar, the light emitting member is at least partially received in the recess.
  • the side-incident backlight module further includes a back plate, and the light guide plate and the light-proof preventing member are disposed on the back plate.
  • the light bar further comprises a printed circuit board, and the light emitting member is disposed on the printed circuit board.
  • the number of the grooves is one; the groove penetrates the light leakage preventing member along a width direction of the light guide plate.
  • the number of the grooves is the same as the number of the illuminating members, and the illuminating members are in one-to-one correspondence with the grooves.
  • the upper surface and/or the lower surface of the light leakage preventing member is provided with a mesh point.
  • the thickness of the light leakage preventing member is the same as the thickness of the light guide plate, the upper surface of the light leakage preventing member is flush with the upper surface of the light guiding plate, and the lower surface of the light leakage preventing member is The lower surface of the light guide plate is flush; the length of the light leakage preventing member is the same as the width of the light guide plate.
  • the side-incident backlight module may include two reflective films, one reflective film attached to the upper surface of the light-proofing member and a portion of the light guide plate on the side of the light-proofing member.
  • the surface, another reflective film is attached to the lower surface of the light leakage preventing member and the lower surface of the light guide plate.
  • the side-incident type backlight module may include three reflective films, and one reflective film is attached to the upper surface of the light-proofing member and a portion of the upper surface of the light-shielding member on the side of the light-proofing member.
  • One reflective film is attached to the lower surface of the light leakage preventing member, and the other reflective film is attached to the lower surface of the light guiding plate.
  • the sides of the two reflective diaphragms are flush with the sides of the light-shielding member.
  • the material of the light leakage preventing member may be the same as the material of the light guide plate.
  • the light incident surface of the light guide plate is a sloped surface, and a distance between the light incident surface and the light leakage preventing member gradually increases in a direction from a bottom surface of the light guide plate to a bottom surface of the light guide plate.
  • the inner surface of the groove is a smooth curved surface.
  • the arcuate surface is part of a circumferential surface or is part of an elliptical surface.
  • a gap may exist between the light leakage preventing member and the light incident surface of the light guide plate.
  • a display device including the above-described side incident type backlight module is provided.
  • FIG. 1 is a schematic structural view of a side-incident backlight module according to the related art.
  • FIG. 2 is a schematic view showing a propagation path of light in the side-incident type backlight module shown in FIG. 1.
  • FIG. 3A is a schematic structural diagram of a side-incident backlight module according to an embodiment of the present disclosure.
  • FIG. 3B is a schematic perspective view of a side-incident backlight module according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic view showing a propagation path of light in the side-incident type backlight module shown in FIG. 3A.
  • FIG. 5 is a schematic structural view of a light leakage preventing member according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural view of another light leakage preventing member according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic view showing a distribution of dots on a surface of a light guide plate according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic view of a distribution of dots on a surface of a light leakage preventing member according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a side-incident backlight module according to an embodiment of the present disclosure.
  • the side-incident backlight module 100 includes a plastic frame 11 , a back plate 12 , an LED light bar 13 , a light guide plate 14 , and an optical film 15 .
  • the LED light bar 13 is adhered to the back plate 12 by a thermal conductive adhesive.
  • the LED light bar 13 includes a printed circuit board 131 and an LED lamp 132 disposed on the printed circuit board 131.
  • the light emitting surface of the LED lamp 132 faces the light incident surface of the light guide plate 14, and the light emitted from the LED lamp 132 is transmitted and reflected by the light guide plate 14, and is irradiated onto the liquid crystal panel.
  • part of the light emitted by the LED lamp 132 fails to enter the light guide plate 14, and there is light leakage, which causes a decrease in light efficiency.
  • the present disclosure provides a side-incident type backlight module and a display device, which can solve the technical problems existing in the related art.
  • a side-incident backlight module 300 includes a plastic frame 31 , a back plate 32 , a light guide plate 33 , a light bar 34 , and a light leakage preventing member 35 .
  • the light guide plate 33 and the light leakage preventing member 35 are disposed on the back plate 32.
  • the backing plate 32 is generally "L" shaped: one surface thereof (i.e., the substantially horizontal surface in Fig. 3A) is used to carry the light guide plate 33 and the light leakage preventing member 35; the other surface (i.e., the substantially vertical surface in Fig. 3A) ) for fixing the light bar 34.
  • the light bar 34 includes a printed circuit board 341 and a light emitting member 342 disposed on the printed circuit board 341. There may be a plurality of illuminating members on the light bar 34.
  • the illuminating member 342 can be an LED lamp or other light source that meets the requirements.
  • the light leakage preventing member 35 is disposed on the back plate 32, and the light leakage preventing member 35 is located between the light bar 34 and the light guide plate 33 and extends in the width direction of the light guide plate 33.
  • the light leakage preventing member 35 includes a groove having an opening facing the light bar 34, and the light emitting member 342 is at least partially received in the groove. That is to say, the illuminating member 342 may be partially accommodated in the recess or may be entirely accommodated in the recess.
  • the inner surface of the groove is a smooth curved surface.
  • the curved surface is for example a part of a circumferential surface or a part of an elliptical surface.
  • the material of the light leakage preventing member 35 may be the same as the material of the light guide plate 33.
  • the material of the light leakage preventing member 35 may be, for example, a PMMA (polymethyl methacrylate) material, a PC (polycarbonate) material, or an MS (terminal silane-based polyether prepolymer) material.
  • the width direction W of the light guide plate 33, the longitudinal direction L of the light guide plate 33, and the thickness H of the light guide plate 33 are as shown in FIG. 3B.
  • the orientation word “upper” herein refers to the direction indicated by the arrow for indicating the direction H of the thickness of the light guide plate 33, and the orientation word “lower” refers to the opposite direction to the direction indicated by the orientation word “upper”.
  • the longitudinal direction, the width direction, the upper and lower orientation words are used.
  • orientation terms describing the relative positional relationship between the various components in the embodiments of the present disclosure are not limited to the orientation terms used herein, and other orientation terms may be used to describe the relative positional relationship between the various components in the embodiments of the present disclosure. As long as the relative positional relationship between the various components in the embodiment of the present disclosure is unchanged, even if the side-incident type backlight module is subjected to any orientation change as a whole, it is within the coverage of the embodiment of the present disclosure.
  • the light rays 41, 42 in FIG. 4 do not enter the light guide plate 33.
  • the propagation path of the light rays 41, 42 can be changed, and finally the light rays 41, 42 can enter the light guide plate 33, which reduces light leakage and can improve light efficiency.
  • the beneficial effect of the embodiment is that by providing a light-proof member including a groove between the light bar and the light guide plate, and at least partially accommodating the light-emitting member in the groove, the light-proof member can change the light propagation.
  • the direction increases the proportion of light emitted by the illuminating member into the light guide plate, thereby reducing light leakage and improving light efficiency.
  • the thickness of the light leakage preventing member 35 is the same as the thickness of the light guide plate 33, and the upper surface of the light leakage preventing member 35 is flush with the upper surface of the light guide plate 33, and the lower surface of the light leakage preventing member 35 and the light guide plate 33 are The lower surface is flush; the length of the light leakage preventing member 35 is the same as the width of the light guide plate 33.
  • the light leakage preventing member 35 may be disposed in contact with the printed circuit board 341. In another embodiment, a gap may be reserved between the light leakage preventing member 35 and the printed circuit board 341 to facilitate assembly of the light leakage preventing member 35 between the light bar 34 and the light guide plate 33.
  • the number of the grooves on the light-proof light-emitting member 35 is 1, and the groove penetrates the light-proof light-guiding member 35 along the width direction of the light guide plate 33 . Accordingly, each of the light-emitting members 342 on the light bar 34 is at least partially received in the recess.
  • the light-proofing member 35 of this structure is not only simple to prepare, but also saves material and can be easily mounted.
  • the light leakage preventing member 35 may include a plurality of grooves 351 .
  • the number of the grooves 351 is the same as the number of the light-emitting members 342, and the light-emitting members 342 are in one-to-one correspondence with the grooves. That is, each of the grooves 351 correspondingly accommodates one of the light-emitting members 342. Since each of the illuminating members 342 corresponds to one recess 351, the inner surface of the recess 351 can more fully wrap the corresponding illuminating member 342, thereby further reducing light leakage and improving light efficiency.
  • the side-incident backlight module 300 further includes reflective films 36 and 37 .
  • the reflective film 36 is bonded to the upper surface of the light leakage preventing member 35 and a portion of the upper surface of the light guide plate 33 on the side of the light leakage preventing member 35.
  • the reflective film 37 is attached to the lower surface of the light leakage preventing member 35 and the lower surface of the light guiding plate 33. (the entire lower surface).
  • the reflection films 36 and 37 can re-reflect the light scattered from the upper and lower surfaces of the light guide plate 33 and the light leakage preventing member 35 to the light guide plate 33 and the light leakage preventing member 35, thereby improving the light effect of the light emitted from the upper surface.
  • the sides of the reflective diaphragms 36, 37 are flush with the sides of the light leakage preventing member 35. In this way, the reflective films 36 and 37 can be conveniently attached to ensure the accuracy of the dressing.
  • the side-incident backlight module 300 further includes three reflective films 39 respectively attached to three sides of the light guide plate 33 .
  • the reflective film 39 can reflect the light scattered from the side of the light guide plate 33 into the light guide plate 33 to improve the light efficiency.
  • the side-incident backlight module 300 further includes an optical film set 38 , which is located on the upper surface of the light guide plate 33 and located on a side away from the light leakage preventing member 35 .
  • the number of layers of the film in the optical film group 38 and the material of the film can be set according to actual needs to specifically improve the light efficiency.
  • the optical film set 38 may include a first diffusion film 381 attached to the light exit surface of the light guide plate 33, a second diffusion film 382 attached to the light exit surface of the first diffusion film 381, and a second diffusion film.
  • the first diffusion film 381 and the second diffusion film 382 can make the outgoing light distribution more uniform, and the first prism layer 383 can concentrate the received light, so that the light directed to the liquid crystal panel is uniform and the brightness is high, and the light effect is improved.
  • the second diffusion film 382 and the first prism layer 383 of the optical film group 38 may be removed, and replaced by a second prism layer (instead of the second diffusion film 382) and a sticker.
  • a brightness enhancement film (instead of the first prism layer 383) that is combined with the light exit surface of the second prism layer.
  • the brightness enhancement film may be a DBEF (dual brightness enhancement film) or other suitable film.
  • the first diffusion film 381 can make the outgoing light distribution more uniform, and the second prism layer can concentrate the received light, and the brightness enhancement film can allow light in a specific direction of the received light to pass through, prohibiting light in other directions. Through, so that the optical film group 38 can improve the brightness of the emitted light as a whole.
  • the optical film group 38 in the present embodiment can make the light directed to the liquid crystal panel uniform and high in brightness, improving the light effect.
  • the lower surface of the light guide plate 33 may have a mesh point 331 .
  • the farthest portion from the light-emitting member 342 is provided with the reflective film 39, so that the dot 331 is slightly smaller. . With this setting, the display brightness of the liquid crystal panel can be ensured to be uniform.
  • the dots 331 may be prepared on the lower surface of the light guide plate 33 by a process such as hot pressing, printing, or injection molding.
  • the material of the dots 331 is a nearly milky white ink. If the dots 331 are prepared by a hot press or injection molding process, the dots 331 are a small pit. In this way, the specular reflection of the light on the lower surface of the light guide plate 33 can be destroyed, so that the light forms a diffuse reflection on the lower surface, so that the light emerges from the upper surface (light exit surface) of the light guide plate 33 to form a surface light source.
  • the upper surface of the light leakage preventing member 35 may be provided with a mesh point 352 .
  • the size of the light leakage preventing member 35 is small, the area of the upper surface of the light leakage preventing member 35 is also small, and the size of the halftone dot 352 of the upper surface of the upper light leakage preventing member 35 may be the same.
  • the size and distribution of the mesh points 352 may not be limited to the embodiments provided by the embodiments of the present disclosure.
  • the lower surface of the light leakage preventing member 35 may be provided with a mesh dot 352 whose distribution law is similar to that of the mesh dot 352 of the upper surface of the light leakage preventing member 35.
  • the specular reflection of the light at the upper and lower surfaces of the light-proof preventing member 35 can be destroyed, so that the light forms a diffuse reflection on the upper and lower surfaces, and cooperates with the dots of the bottom surface of the light guide plate 33, so that the light is diffused and reflected through the mesh points, and then from the light guide plate.
  • the surface (light-emitting surface) is emitted to form a surface light source.
  • the light incident surface of the light guide plate 33 may be a slope, and the distance between the light incident surface and the light leakage preventing member 35 is in the direction of the bottom surface of the light guide plate 33 from the upper surface of the light guide plate 33.
  • the horizontal portion of the backing plate 32 is used to support the light guide plate 33. It can also be said that the distance between the light incident surface and the light leakage preventing member 35 gradually increases from the side closer to the light exiting surface to the side farther from the light exiting surface.
  • the light incident surface of the light guide plate 33 is disposed in parallel with the bottom surface of the light leakage preventing member 35 (ie, the surface facing the light incident surface), the light 43 may propagate in the original propagation direction and be refracted to the light guide plate 33.
  • the lower surface is reflected by the lower surface to reach the exit surface.
  • the light incident surface of the light guide plate 33 is a slope as shown in FIG.
  • the parallel relationship between the light incident surface of the light guide plate 33 and the bottom surface of the light leakage preventing member 35 is changed, so that The light 43 is refracted toward the light exiting surface to reduce the chance of light being reflected by the bottom surface of the light guide plate 33, thereby reducing the optical path of the light 43 before reaching the light exiting surface, thereby improving the light effect. Therefore, the distance between the light incident surface of the light guide plate 33 and the light leakage preventing member 35 in the embodiment of the present disclosure gradually increases in the direction from the bottom surface of the light guide plate 33 toward the bottom surface of the light guide plate 33, and the light incident surface can be received. The light is refracted toward the light-emitting surface, reducing the light path before the light reaches the light-emitting surface, improving the light efficiency.
  • the thickness of the light leakage preventing member 35 is larger than the thickness of the light guide plate 33, and the thickness of the light leakage preventing member 35 is between the light emitting surface of the light guiding plate 33 and the surface of the backing plate 32 for supporting the light leakage preventing member 35.
  • Distance decision the side-incident backlight module 300 includes reflective films 36, 37, and 91.
  • the reflective film 36 is attached to the upper surface of the light-proof preventing member 35 and the upper surface of the light-guiding plate 33 on the side of the light-proof preventing member 35.
  • the reflective film 37 is attached to the lower surface of the light-guiding plate 33, and the reflective film 91 is attached.
  • the lower surface of the light leakage preventing member 35 is incorporated.
  • the reflection films 36, 37, and 91 can re-reflect the light emitted from the upper and lower surfaces of the light guide plate 33 and the light leakage preventing member 35 to the light guide plate 33 and the light leakage preventing member 35, thereby improving the light effect.
  • the side surfaces of the reflective diaphragms 36, 91 are flush with the side surfaces of the light leakage preventing member 35, and the side surfaces of the reflective film 37 are flush with the side surfaces of the light guide plate 33. In this way, the reflective films 36, 37 and 91 can be conveniently attached to ensure the accuracy of the application.
  • a gap may exist between the light leakage preventing member 35 and the light incident surface of the light guide plate 33.
  • the light incident surface of the light guide plate 33 may adopt a slope as shown in FIG. 3A, so that even if the intersection of the light exit surface of the light guide plate 33 and the light incident surface is in contact with the light leakage preventing member 35, due to the existence of the slope, There may still be a wedge-shaped gap between the light leakage preventing member 35 and the light incident surface of the light guide plate 33 for achieving the effect of light mixing and solving the Hot Spot problem. In this way, it can save space, solve the badness of Hot Spot, and improve the light efficiency.
  • Embodiments of the present disclosure also provide a display device including the side-entry backlight module of any of the above embodiments.
  • the beneficial effect of the embodiment is that: the light leakage preventing member including at least one groove is disposed between the light bar and the light guide plate, and at least a portion of the light emitting member is received in the groove, so that the light leakage preventing member can change the light
  • the direction of propagation increases the proportion of light emitted by the illuminating member into the light guide plate, thereby reducing light leakage, improving light efficiency, and thereby improving the display effect of the display device.
  • the display device in this embodiment may be any product or component having a display function, such as an electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator, and the like.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
  • the term “plurality” refers to two or more, unless specifically defined otherwise.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种侧面入射式背光模组（100），包括：导光板（14）和灯条（13），灯条（13）设置在导光板（14）的入光面一侧且包括发光件（342）；以及防漏光构件（35），防漏光构件（35）位于灯条（13）与导光板（14）之间，且沿导光板（14）的宽度方向延伸，防漏光构件（35）包括至少一个凹槽（351），凹槽（351）的开口朝向灯条（13），发光件（342）至少部分容纳于凹槽中。侧面入射式背光模组（100），可以通过改变光的传播方向增加发光件（342）所发出的光进入导光板（14）的比例，从而减少漏光，提高光效。

Description

侧面入射式背光模组和显示装置
相关申请
本申请要求保护在2017年10月19日提交的申请号为201710976977.0的中国专利申请的优先权，该申请的全部内容以引用的方式结合到本文中。
技术领域
本公开涉及显示技术领域，尤其涉及一种侧面入射式背光模组和显示装置。
背景技术
背光模组是液晶显示器的重要组成部分，背光模组用于为液晶显示器提供充足及均匀的平面状背光。常见的背光模组主要包括由胶框、背板、光源、导光板和光学膜材等。其中，背板、光源、导光板和光学膜材位于胶框内。通常情况下，背光模组分为侧面入射式(side-incidence)背光模组和直下式(bottom-incidence)背光模组，其中，侧面入射式背光模组一般采用位于胶框侧面的灯条作为光源。光源的发光面正对着导光板的入光面，光源发出的光经导光板传递反射，照射到液晶面板上。然而，光源发出的光有部分未能进入导光板，即存在漏光现象，造成了光效降低。
公开内容
根据本公开实施例的第一方面，提供一种侧面入射式背光模组，所述侧面入射式背光模组包括：导光板；
灯条，所述灯条设置在所述导光板的入光面一侧且包括发光件；以及
防漏光构件，所述防漏光构件位于所述灯条与所述导光板之间，且沿所述导光板的宽度方向延伸，所述防漏光构件包括至少一个凹槽，所述凹槽的开口朝向所述灯条，所述发光件至少部分容纳于所述凹槽中。
可选地，所述侧面入射式背光模组还包括背板，所述导光板和所 述防漏光构件设置在所述背板上。
可选地，所述灯条还包括印刷电路板，所述发光件设置在所述印刷电路板上。
在一个实施例中，所述凹槽的数目为1；所述凹槽沿所述导光板的宽度方向贯穿所述防漏光构件。
在一个实施例中，所述发光件有多个，所述凹槽的数目与所述发光件的数目相同，且所述发光件与所述凹槽一一对应。
在一个实施例中，所述防漏光构件的上表面和/或下表面设置有网点。
在一个实施例中，所述防漏光构件的厚度与所述导光板的厚度相同，所述防漏光构件的上表面与所述导光板的上表面齐平，所述防漏光构件的下表面与所述导光板的下表面齐平；所述防漏光构件的长度与所述导光板的宽度相同。
在一个实施例中，上述的侧面入射式背光模组可包括两个反射膜片，一个反射膜片贴合于所述防漏光构件的上表面以及所述导光板在防漏光构件侧的部分上表面，另一个反射膜片贴合于所述防漏光构件的下表面以及所述导光板的下表面。
可选地，上述的侧面入射式背光模组可包括三个反射膜片，一个反射膜片贴合于所述防漏光构件的上表面以及所述导光板在防漏光构件侧的部分上表面，一个反射膜片贴合于所述防漏光构件的下表面，另一个反射膜片贴合于所述导光板的下表面。
在一个实施例中，在所述灯条一侧，两个反射膜片的侧面与所述防漏光构件的侧面齐平。
在一个实施例中，所述防漏光构件的材料可与所述导光板的材料相同。
在一个实施例中，所述导光板的入光面为斜面，所述入光面与所述防漏光构件之间的距离在自导光板的上表面向导光板的底面的方向上逐渐增加。
可选地，所述凹槽的内表面为平滑的弧面。
可选地，所述弧面为圆周面的一部分或为椭圆面的一部分。
在一个实施例中，所述防漏光构件与所述导光板的入光面之间可存在空隙。
根据本公开实施例的第二方面，提供一种显示装置，包括上述的侧面入射式背光模组。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本公开。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本公开的实施例，并与说明书一起用于解释本公开的原理。
图1是根据相关技术示出的一种侧面入射式背光模组的结构示意图。
图2是图1所示的侧面入射式背光模组中的光的传播路径示意图。
图3A是根据本公开实施例示出的侧面入射式背光模组的结构示意图。
图3B是根据本公开实施例示出的侧面入射式背光模组的方位示意图。
图4是图3A所示的侧面入射式背光模组中的光的传播路径示意图。
图5是根据本公开实施例示出的一种防漏光构件的结构示意图。
图6是根据本公开实施例示出的另一种防漏光构件的结构示意图。
图7是根据本公开实施例示出的导光板表面上的网点分布示意图。
图8是根据本公开实施例示出的防漏光构件表面上的网点分布示意图。
图9是根据本公开实施例示出的侧面入射式背光模组的结构示意图。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本公开相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本公开的一些方面相一致的装置和方法的例子。
请参阅图1，相关技术中，侧面入射式背光模组100包括胶框11、背板12、LED灯条13、导光板14以及光学膜片15。其中，LED灯条 13用导热胶粘固在背板12上。LED灯条13包括印刷电路板131和设置在所述印刷电路板131上的LED灯132。LED灯132的发光面正对着导光板14的入光面，LED灯132发出的光经导光板14传递反射，照射到液晶面板上。
然而，请参阅图2，LED灯132发出的光中有部分光未能进入导光板14，存在漏光现象，造成了光效降低。
因此，本公开提供一种侧面入射式背光模组和显示装置，可以解决相关技术中存在的技术问题。
请参阅图3A，本公开实施例示出的侧面入射式背光模组300，包括：胶框31、背板32、导光板33、灯条34以及防漏光构件35。
其中，导光板33以及防漏光构件35设置在背板32上。背板32大致呈“L”形：其一个表面(即图3A中的大致水平的表面)用于承载导光板33和防漏光构件35；另一个表面(即图3A中的大致竖直的表面)用于固定灯条34。灯条34包括印刷电路板341和设置在印刷电路板341上的发光件342。灯条34上的发光件可以有多个。发光件342可以是LED灯，也可以是符合需求的其他光源。防漏光构件35设置在背板32上，该防漏光构件35位于灯条34与导光板33之间，且沿导光板33的宽度方向延伸。防漏光构件35包括凹槽，凹槽的开口朝向灯条34，发光件342至少部分容纳于凹槽中。也就是说，发光件342可以部分容纳于凹槽中，也可以全部容纳于凹槽中。举例而言，所述凹槽的内表面为平滑的弧面。所述弧面例如为圆周面的一部分或为椭圆面的一部分。防漏光构件35的材料可以与导光板33的材料相同。防漏光构件35的材料例如可以是PMMA(聚甲基丙烯酸甲酯)材料、PC(聚碳酸酯)材料或者MS(端硅烷基聚醚预聚体)材料。
需要说明的是，请参阅图3B，在本公开实施方式中，导光板33的宽度方向W、导光板33的长度方向L以及导光板33的厚度所在方向H如图3B所示。本文中的方位词“上”是指图中用于标注导光板33的厚度所在方向H的箭头所指的方向，方位词“下”是指与方位词“上”所指方向的反方向。为便于说明本公开实施方式中各个部件之间的相对位置关系，采用了长度方向、宽度方向、上、下等方位词。但描述本公开实施方式中各个部件之间相对位置关系的方位用语不限于本文中采用的方位用语，也可以采用其他方位用语表述本公开实施 方式中各个部件之间相对位置关系。只要本公开实施方式中的各个部件之间相对位置关系不变，即便对侧面入射式背光模组在整体上进行任何方位变换，均在本公开实施方式的覆盖范围之内。
请参阅图4，如果侧面入射式背光模组300中不存在防漏光构件35，那么，图4中光线41、42不会进入导光板33。而在本公开实施例中，由于防漏光构件35的存在，可以改变光线41、42的传播路径，最终使得光线41、42可以进入导光板33，减少了漏光，可以提高光效。
本实施例的有益效果是：通过在灯条与导光板之间设置包括凹槽的防漏光构件，并将发光件的至少部分容纳于凹槽中，这样，防漏光构件可以通过改变光的传播方向增加发光件所发出的光进入导光板的比例，从而减少漏光，提高光效。
在本公开实施例中，防漏光构件35的厚度与导光板33的厚度相同，防漏光构件35的上表面与导光板33的上表面齐平，防漏光构件35的下表面与导光板33的下表面齐平；防漏光构件35的长度与导光板33的宽度相同。这样，可以方便在防漏光构件35与导光板33的表面覆盖光学膜材。
需要说明的是，在一个实施例中，防漏光构件35可以与印刷电路板341接触设置。在另一个实施例中，防漏光构件35与印刷电路板341之间可以预留空隙，以便于将防漏光构件35组装在灯条34与导光板33之间。
可选地，请参阅图5，防漏光构件35上凹槽的数目为1，该凹槽沿导光板33的宽度方向贯穿防漏光构件35。相应地，灯条34上每个发光件342均至少部分容纳于凹槽中。采用该结构的防漏光构件35，不但制备简单，节约材料，还可以方便安装。
可选地，请参阅图6，防漏光构件35上可包括多个凹槽351。其中，凹槽351的数目与发光件342的数目相同，且发光件342与凹槽一一对应。也就是每个凹槽351中对应地容纳一个发光件342。由于每个发光件342对应一个凹槽351，凹槽351的内表面可以更加充分地包裹对应的发光件342，进而可以进一步减少漏光，提高光效。
可选地，请继续参阅图3A，侧面入射式背光模组300还包括反射膜片36、37。反射膜片36贴合于防漏光构件35的上表面以及导光板33在防漏光构件35侧的部分上表面，反射膜片37贴合于防漏光构件 35的下表面以及导光板33的下表面(整个下表面)。反射膜片36、37可以将从导光板33与防漏光构件35的上下表面散射出去的光再反射到导光板33与防漏光构件35中，提高光从上表面出射的光效。
可选地，请继续参阅图3A，在灯条34一侧，反射膜片36、37的侧面与防漏光构件35的侧面齐平。这样，可以方便贴反射膜片36、37，保证贴服精度。
可选地，请继续参阅图7，侧面入射式背光模组300还包括分别贴合于导光板33的三个侧面的三个反射膜片39。反射膜片39可以将从导光板33侧面散射出去的光再反射到导光板33中，提高光效。
请继续参阅图3A，侧面入射式背光模组300还包括光学膜组38，该光学膜组38位于导光板33的上表面，且位于远离防漏光构件35的一侧。光学膜组38中膜片的层数以及膜片的材料可以根据实际需求进行设置，以有针对性地提高光效。
在一个实施例中，光学膜组38可以包括贴合于导光板33出光面的第一扩散膜381、贴合于第一扩散膜381出光面的第二扩散膜382以及贴合于第二扩散膜382出光面的第一棱镜层383。第一扩散膜381与第二扩散膜382可以使得出射光分布更均匀，第一棱镜层383可以将接收的光进行汇聚，从而使得射向液晶面板的光均匀且亮度高，提高了光效。
作为变更，在另一个实施例中，可以移除上述光学膜组38中的第二扩散膜382以及第一棱镜层383，取而代之的分别是第二棱镜层(取代第二扩散膜382)以及贴合于该第二棱镜层出光面的增亮膜(取代第一棱镜层383)。其中，增亮膜可以是DBEF(dual brightness enhancement film，反射式偏光增亮膜)，也可以是其他符合需求的膜片。此时，第一扩散膜381可以使得出射光分布更均匀，第二棱镜层可以将接收的光进行汇聚，增亮膜可以允许接收的光中处于特定方向的光透过，禁止其他方向的光透过，以使得光学膜组38能整体提高出射光的亮度。这样，本实施例中的光学膜组38可以使得射向液晶面板的光均匀且亮度高，提高了光效。
可选地，请参阅图7，导光板33的下表面可以有网点331。距离发光件342越近，网点331越小，距离发光件342越远，网点331越大；而在离发光件342最远的部位，由于设置了反射膜片39，因此， 网点331略小些。如此设置，可以保证液晶面板的显示亮度均匀一致。在实际应用中，可以通过热压、印刷、注塑等工艺在导光板33的下表面制备网点331。如果通过印刷工艺制备网点331，网点331的材料是近乎乳白色的油墨。如果是通过热压、注塑工艺制备网点331，则网点331是一个一个细小的凹坑。这样，可以破坏光在导光板33下表面的镜面反射，使得光线在下表面形成漫反射，使得光线从导光板33上表面(出光面)处出射后形成面光源。
进一步地，请参阅图8，防漏光构件35的上表面可以设置有网点352。在一个实施例中，如图8所示，距离发光件342越近，网点352可以越小，距离发光件342越远，网点352可以越大。在另一个实施例中，由于防漏光构件35的尺寸较小，防漏光构件35的上表面的面积也较小，上防漏光构件35的上表面的网点352的尺寸可以相同。当然，在实际应用时，网点352的尺寸及分布规律可以不限于本公开实施例提供的实施方式。同样，防漏光构件35的下表面也可以设置有网点352，网点352的分布规律与防漏光构件35的上表面的网点352的分布规律相似。这样，可以破坏光在防漏光构件35的上下表面处的镜面反射，使得光线在上下表面形成漫反射，并且和导光板33底面的网点配合，使得光线经这些网点漫反射后，从导光板上表面(出光面)出射后形成面光源。
可选地，请继续参阅图3A，导光板33的入光面可以为斜面，该入光面与防漏光构件35之间的距离在自导光板33的上表面向导光板33的底面的方向上逐渐增加，背板32的水平部分用于支撑导光板33。也可以说是，入光面与防漏光构件35之间的距离自靠近出光面的一侧向远离出光面的一侧逐渐增加。请参阅图4，如果导光板33的入光面与防漏光构件35的底面(即朝向入光面的表面)平行设置，那么，光线43可能会按照原来的传播方向传播，折射至导光板33的下表面，经下表面反射到达出光面。而本公开实施例中，导光板33的入光面为如图4所示的斜面，即改变了导光板33的入光面与防漏光构件35的底面之间的平行关系，这样，就可以将光线43朝向出光面折射，减少光被导光板33底面反射的机会，从而减小光线43在到达出光面之前的光路路程，提高光效。因此，本公开实施例中的导光板33的入光面与防漏光构件35之间的距离在自导光板33的上表面向导光板33的底 面的方向上逐渐增加，可以将入光面接收到的光向出光面折射，减少光在到达出光面之前的光路路程，提高光效。
可选地，请参阅图9，为避免对相关技术中的背板(参阅图1)进行改造，节约模具设计和制造成本，也可以采用如图9所示的实施方式。在本实施方式中，防漏光构件35的厚度大于导光板33的厚度，且防漏光构件35的厚度由导光板33的出光面到背板32的用于支撑防漏光构件35的表面之间的距离决定。进一步地，在本实施方式中，侧面入射式背光模组300包括反射膜片36、37以及91。其中，反射膜片36贴合于防漏光构件35的上表面以及导光板33在防漏光构件35侧的部分上表面，反射膜片37贴合于导光板33的下表面，反射膜片91贴合于防漏光构件35的下表面。反射膜片36、37、91可以将从导光板33与防漏光构件35的上下表面出射出去的光再反射到导光板33与防漏光构件35中，提高光效。
可选地，请继续参阅图9，在灯条34一侧，反射膜片36、91的侧面与防漏光构件35的侧面齐平，反射膜片37的侧面与导光板33的侧面齐平。这样，可以方便贴反射膜片36、37以及91，保证贴服精度。
可选地，防漏光构件35与导光板33的入光面之间可以存在空隙。这样，光可以在空隙中进行混光，以解决热点(Hot Spot)问题。为节约空间，导光板33的入光面可以采用如图3A所示的斜面，这样，即使导光板33的出光面与入光面的交接处与防漏光构件35接触，但由于斜面的存在，使得防漏光构件35与导光板33的入光面之间仍然可以存在楔形的空隙，以用于达到混光的效果，解决Hot Spot问题。这样，既可以节约空间，又可以解决Hot Spot的不良，还可以提高光效。
本公开的实施例还提出了一种显示装置，包括上述任一实施例的侧面入射式背光模组。
本实施例的有益效果是：通过在灯条与导光板之间设置包括至少一个凹槽的防漏光构件，并将发光件的至少部分容纳于凹槽中，这样，防漏光构件可以通过改变光的传播方向增加发光件所发出的光进入导光板的比例，从而减少漏光，提高光效，进而可以改善显示装置的显示效果。
需要说明的是，本实施例中的显示装置可以为：电子纸、手机、平板电脑、电视机、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。
需要指出的是，在附图中，为了图示的清晰可能夸大了层和区域的尺寸。而且可以理解，当元件或层被称为在另一元件或层“上”时，它可以直接在其他元件上，或者可以存在中间的层。另外，可以理解，当元件或层被称为在另一元件或层“下”时，它可以直接在其他元件下，或者可以存在一个以上的中间的层或元件。另外，还可以理解，当层或元件被称为在两层或两个元件“之间”时，它可以为两层或两个元件之间唯一的层，或还可以存在一个以上的中间层或元件。通篇相似的参考标记指示相似的元件。
在本公开中，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。术语“多个”指两个或两个以上，除非另有明确的限定。
本领域技术人员在考虑说明书及实践这里公开的公开后，将容易想到本公开的其它实施方案。本公开旨在涵盖本公开的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的，本公开的真正范围和精神由下面的权利要求指出。
应当理解的是，本公开并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本公开的范围仅由所附的权利要求来限制。

Claims (16)

  1. 一种侧面入射式背光模组，包括：
    导光板；
    灯条，所述灯条设置在所述导光板的入光面一侧且包括发光件；以及
    防漏光构件，所述防漏光构件位于所述灯条与所述导光板之间，且沿所述导光板的宽度方向延伸，所述防漏光构件包括至少一个凹槽，所述凹槽的开口朝向所述灯条，所述发光件至少部分容纳于所述凹槽中。
  2. 根据权利要求1所述的侧面入射式背光模组，其中，所述防漏光构件包括一个凹槽，所述凹槽沿所述导光板的宽度方向贯穿所述防漏光构件。
  3. 根据权利要求1所述的侧面入射式背光模组，其中，所述发光件有多个，所述凹槽的数目与所述发光件的数目相同，且所述发光件与所述凹槽一一对应。
  4. 根据权利要求1所述的侧面入射式背光模组，其中，所述防漏光构件的上表面和/或下表面设置有网点。
  5. 根据权利要求1所述的侧面入射式背光模组，其中，所述防漏光构件的厚度与所述导光板的厚度相同，所述防漏光构件的上表面与所述导光板的上表面齐平，所述防漏光构件的下表面与所述导光板的下表面齐平；
    所述防漏光构件的长度与所述导光板的宽度相同。
  6. 根据权利要求1所述的侧面入射式背光模组，还包括两个反射膜片，一个反射膜片贴合于所述防漏光构件的上表面以及所述导光板在防漏光构件侧的部分上表面，另一个反射膜片贴合于所述防漏光构件的下表面以及所述导光板的下表面。
  7. 根据权利要求1所述的侧面入射式背光模组，还包括三个反射膜片，一个反射膜片贴合于所述防漏光构件的上表面以及所述导光板在防漏光构件侧的部分上表面，一个反射膜片贴合于所述防漏光构件的下表面，另一个反射膜片贴合于所述导光板的下表面。
  8. 根据权利要求7所述的侧面入射式背光模组，其中，在所述灯 条一侧，两个反射膜片的侧面与所述防漏光构件的侧面齐平。
  9. 根据权利要求1所述的侧面入射式背光模组，其中，所述防漏光构件的材料与所述导光板的材料相同。
  10. 根据权利要求1所述的侧面入射式背光模组，其中，所述导光板的入光面为斜面，所述入光面与所述防漏光构件之间的距离在自导光板的上表面向导光板的底面的方向上逐渐增加。
  11. 根据权利要求1所述的侧面入射式背光模组，其中，所述凹槽的内表面为平滑的弧面。
  12. 根据权利要求11所述的侧面入射式背光模组，其中，所述弧面为圆周面的一部分或为椭圆面的一部分。
  13. 根据权利要求1所述的侧面入射式背光模组，其中，所述侧面入射式背光模组还包括背板，所述导光板和所述防漏光构件设置在所述背板上。
  14. 根据权利要求1所述的侧面入射式背光模组，其中，所述灯条还包括印刷电路板，所述发光件设置在所述印刷电路板上。
  15. 根据权利要求1至14中任一项所述的侧面入射式背光模组，其中，所述防漏光构件与所述导光板的入光面之间存在空隙。
  16. 一种显示装置，包括权利要求1至15任一项所述的侧面入射式背光模组。
PCT/CN2018/099182 2017-10-19 2018-08-07 侧面入射式背光模组和显示装置 WO2019076101A1 (zh)

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