WO2017024752A1 - 背光模组和显示装置 - Google Patents

背光模组和显示装置 Download PDF

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Publication number
WO2017024752A1
WO2017024752A1 PCT/CN2016/070096 CN2016070096W WO2017024752A1 WO 2017024752 A1 WO2017024752 A1 WO 2017024752A1 CN 2016070096 W CN2016070096 W CN 2016070096W WO 2017024752 A1 WO2017024752 A1 WO 2017024752A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
backlight module
reflecting
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2016/070096
Other languages
English (en)
French (fr)
Inventor
许占齐
陈军
张鹏宇
罗鸿强
张贵玉
马涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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 BOE Technology Group Co Ltd, Hefei Xinsheng Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US15/106,010 priority Critical patent/US10007051B2/en
Publication of WO2017024752A1 publication Critical patent/WO2017024752A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B6/0033—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
    • 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
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • 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
    • 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
    • G02B6/0051—Diffusing 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
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement 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
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide

Definitions

  • the present invention belongs to the field of display technologies, and in particular, to a backlight module and a display device.
  • a flat panel display device mainly includes a liquid crystal display device and an OLED (Organic Light-Emitting Diode) display device.
  • the liquid crystal display device has low power consumption, so it has been favored by consumers since its launch.
  • the liquid crystal display device mainly includes a liquid crystal screen and a backlight module.
  • the backlight module is a component that is disposed on a non-display side of the liquid crystal panel to provide a light source to the liquid crystal panel.
  • Liquid crystal molecules are disposed in the liquid crystal panel, and the rotation of the liquid crystal molecules is driven by the electric field, and the amount of light transmission of each pixel (color pixel or black and white pixel) can be adjusted, thereby realizing image display. Since the liquid crystal molecules themselves do not emit light, the illumination effect of the backlight module directly affects the display effect of the liquid crystal screen.
  • the light source in the backlight module can be divided into three types, namely: a point light source, which mainly uses an LED (Light-Emitting Diode) lamp as a light source, and has the advantages of long life, low heat generation, etc., but the brightness is slightly lower.
  • Line light source which mainly uses CCFL (Cold Cathode Fluorescent Lamp) as the light source, has the advantages of high brightness and long life, but has serious heat generation; surface light source mainly uses VFD (flat fluorescent light) as the light source. It has the advantages of high brightness, good uniformity, etc., but high power consumption.
  • the light source mainly used in the backlight module is a point light source, that is, an LED lamp is used as a light source.
  • a point light source type backlight module includes a light source, a light guide plate, a diffusion sheet, and a prism sheet.
  • the core technology of the backlight module is the optical design of the light guide plate.
  • the light guide plate can be divided into two types: a flat plate type and a wedge shape.
  • a wedge-shaped light guide plate is mainly used. The wedge-shaped light guide plate can realize the conversion of the point source to the line source and the surface source.
  • the light guiding pattern of the back surface of the light guide plate is usually arranged in a discontinuous arrangement, which includes an opaque portion (using The light-transmitting portion (gap) between the light-emitting surface of the light guide plate and the opaque portion. Due to the structure of the light guiding pattern, part of the light is scattered behind the light guide plate through the gap of the light guiding pattern (ie, away from the light emitting surface), resulting in a lower actual utilization of light, and in order to achieve the desired brightness. The power of the LED lamp must be increased, resulting in wasted energy and high cost.
  • embodiments of the present invention provide a backlight module and a display device, wherein light energy emitted by a light source in the backlight module is fully utilized, and light in the backlight module is improved. Utilization, reducing power consumption and saving costs.
  • a backlight module includes a light source and a light guide plate.
  • the light source is disposed on a light incident surface side of the light guide plate, and the light guide surface of the light guide plate is opposite to the light guide plate.
  • the back surface is provided with a light guiding pattern including a gap, wherein the backlight module further includes a reflecting unit for transmitting the gap of the light guiding pattern from the back surface of the light guiding plate The light is reflected back into the light guide plate and emitted from the light exit surface of the light guide plate.
  • the reflecting unit includes a reflector and a group of retroreflective sheets, and a reflecting surface of the reflector is disposed opposite to a back surface of the light guiding plate, and an area of the effective reflecting surface of the reflector is not less than the light guiding plate.
  • the retroreflective sheeting group includes a first reflecting sheet and a second reflecting sheet disposed on the same side of the light guiding plate and the reflecting plate, a reflecting surface of the first reflecting sheet and a reflecting surface of the second reflecting sheet At least partially capable of receiving and reflecting reflected light from the other side such that light transmitted through the gap of the light guiding pattern on the back side of the light guide plate sequentially passes through the reflecting plate, the first reflecting sheet and the second After the reflector is reflected, the light guide plate enters from the light incident surface of the light guide plate.
  • the back surface of the light guide plate is disposed obliquely with respect to the light-emitting surface thereof, and adopts a structure that is gradually thinner from the side closer to the light source side than the light source side;
  • a reflective surface of the reflector is disposed opposite to a back surface of the light guide plate
  • the reflector is a rectangular parallelepiped structure, or the reflector is configured to be thicker from a side closer to the light source than to the side of the light source.
  • the first light reflecting sheet, the second light reflecting sheet and the light source are disposed on the same side of the light guiding plate, and the bottom end position of the first reflecting sheet is not lower than the reflective light of the reflecting sheet
  • the top end of the second retroreflective sheeting is not higher than the light emitting surface of the light guide plate.
  • the first retroreflective sheeting and the second retroreflective sheeting are oppositely disposed on opposite sides of the light source, and between the reflective surface of the first retroreflective sheeting and the reflective surface of the second retroreflective sheeting The angle is less than 180°.
  • the angle between the reflective surface of the first retroreflective sheet and the plane parallel to the light exiting surface of the light guide plate ranges from 100° to 170°, and the reflective surface of the second retroreflective sheet is parallel to The angle between the planes of the light-emitting surfaces of the light guide plate ranges from 10° to 80°.
  • an angle between the reflective surface of the first retroreflective sheeting and a plane parallel to the light exiting surface of the light guide plate is 150°, and the reflective surface of the second retroreflective sheeting is parallel to the light guide plate.
  • the angle between the planes of the illuminating surfaces is 45°.
  • the first retroreflective sheeting and the second retroreflective sheeting are plane mirrors or total reflection optical films.
  • the reflecting unit comprises a concave concentrating plate, a concave surface of the concave concentrating plate is opposite to a back surface of the light guiding plate, a focal point of the concave concentrating plate is located inside the light guiding plate, and the focus corresponds to
  • the back surface area of the light guide plate is a gap of the light guiding pattern.
  • the concave surface of the concave concentrating plate has an arc ranging from 5° to 10°.
  • the backlight module further includes a diffusion sheet and a prism sheet, the diffusion sheet is disposed on a side of the light-emitting surface of the light guide plate, and the prism sheet is disposed on the diffusion sheet away from the light guide plate. side.
  • a display device comprising the above-described backlight module.
  • the backlight module has high light utilization efficiency, and the section Approximate cost; especially for portable mobile display devices, power consumption can be reduced and display device standby time can be extended.
  • FIG. 1 is a cross-sectional view showing the structure of a backlight module according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic view of the optical path of the backlight module of FIG. 1.
  • FIG 3 is a cross-sectional view showing the structure of a backlight module according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic view of the optical path of the backlight module of FIG. 3.
  • FIG. 5 is a cross-sectional view showing the structure of a backlight module according to Embodiment 3 of the present invention.
  • FIG. 6 is a schematic diagram of an optical path of the backlight module of FIG. 5.
  • FIG. 7 is a schematic view showing the assembly of the backlight module of FIG. 1.
  • the embodiment provides a backlight module, wherein the light source is a side-in type light source, that is, the light source is disposed on a side of the light guide plate.
  • the backlight module can greatly improve the utilization of light emitted by the light source under the premise of ensuring the matching of the gray level and the uniformity by the arrangement of the reflection unit.
  • FIG. 1 is a cross-sectional view showing the structure of a backlight module according to an embodiment of the present invention.
  • the backlight module includes a light source 11, a light guide plate 12, a diffusion sheet 16, a prism sheet 17, and a reflection unit.
  • the diffusion sheet 16 is disposed on the light-emitting surface side of the light guide plate 12
  • the prism sheet 17 is disposed on a side of the diffusion sheet 16 away from the light guide plate 12
  • the light source 11 is disposed on the light-incident surface side of the light guide plate 12 (ie, the light source 11 is disposed at The side of the light guide plate 12).
  • the light guide pattern 121 is provided on the back surface of the light guide plate 12 opposite to the light exit surface of the light guide plate 12.
  • the light guide pattern 121 is arranged in a discontinuous arrangement, which includes an opaque portion (for the light output of the light guide plate) The light reflecting portion (gap) between the surface and the opaque portion.
  • the reflecting unit is configured to reflect light transmitted from the gap of the light guiding pattern 121 on the back surface of the light guide plate 12 back to the light guide plate 12 and to emit light from the light emitting surface thereof.
  • the reflecting unit in the embodiment includes a reflector 13 and a reflector group.
  • the reflective surface of the reflector 13 is disposed opposite to the back surface of the light guide plate 12, preferably disposed in parallel, and the effective reflective surface of the reflector 13 is not It is smaller than the area of the back surface of the light guide plate 12.
  • the retroreflective sheet set includes a first retroreflective sheeting 14 and a second retroreflective sheeting 15 disposed on the same side of the light guide plate 12 and the retroreflective sheeting 13.
  • At least a portion of the reflective surface of the first retroreflective sheeting 14 and the reflective surface of the second retroreflective sheeting 15 can receive and reflect reflected light from the other side for transmission through the gap of the light guiding pattern 121 on the back side of the light guiding plate 12.
  • the light is sequentially reflected by the light reflecting plate 13, the first light reflecting sheet 14, and the second light reflecting sheet 15, and then enters the light guiding plate 12 from the light incident surface of the light guiding plate 12.
  • the back surface of the light guide plate 12 is inclined with respect to the light-emitting surface thereof, and the light guide plate 12 has a structure that is gradually thinner from the side closer to the light source 11 toward the side closer to the light source 11, that is, the light guide plate 12 has a wedge-shaped structure.
  • the reflector 13 is also a wedge-shaped structure, and the reflector 13 has a structure that is gradually thicker from the side closer to the light source 11 toward the side farther from the light source 11.
  • the size of the reflector 13 may be larger than the size of the light guide plate 12.
  • the reflector 13 may extend from a region corresponding to the light guide plate 12 to below the light source 11 to avoid missing any light transmitted from the back surface of the light guide plate 12 as much as possible.
  • the specific distance between the light guide plate 12 and the reflector 13 is determined by the light guiding path, and can be adjusted according to design requirements. Since the back surface of the light guide plate 12 and the reflecting surface of the light reflecting plate 13 are opposite and nearly parallel, it is ensured that the light is reflected in a direction perpendicular to the reflecting surface of the reflecting plate 13 and in a direction oblique to the reflecting surface of the reflecting plate 13. The light of the panel 13 can be reflected back to the light guide plate 12 and utilized, thereby improving the utilization of light emitted by the light source 11.
  • first retroreflective sheeting 14 and the second retroreflective sheeting 15 may be elongated and disposed on the same side of the light guide plate 12 as the light source 11, that is, on the light incident surface side of the light guide plate 12.
  • the bottom end position of the first light reflecting sheet 14 is not lower than the reflecting surface of the light reflecting plate 13, and the top end position of the second reflecting sheet 15 is not higher than the light emitting surface of the light guiding plate 12.
  • the first retroreflective sheeting 14 and the second retroreflective sheeting 15 are disposed on the light guide plate.
  • the incident side of the light incident surface is oppositely disposed on both sides of the light source 11, and the angle between the reflective surface of the first retroreflective sheeting 14 and the reflective surface of the second retroreflective sheeting 15 is less than 180°.
  • the light source 11 is preferably an LED light bar;
  • the first light reflecting sheet 14 and the second light reflecting sheet 15 are preferably a plane mirror or a total reflection optical film, and the first reflecting sheet 14 and the second reflecting sheet 15 are preferably made of a frame glue. It is fixed to both sides of the light source 11.
  • the angle ⁇ between the reflective surface of the first retroreflective sheeting 14 and the plane parallel to the light exiting surface of the light guide plate 12 ranges from 100° to 170°, and the reflective surface of the second retroreflective sheeting 15 is parallel to the guide.
  • the angle ⁇ between the planes of the light-emitting surfaces of the light plate 12 ranges from 10° to 80°.
  • FIG. 7 it is a schematic diagram of assembly of the backlight module of FIG. 1 . As shown in FIG. 7, based on the inclined back surface of the light guide plate 12 and the inclined reflective surface of the light reflecting plate 13 (both under the prism sheet 17,), the first light reflecting sheet 14 and the second light reflecting sheet 15 are fixed at a certain angle to the frame.
  • the light guide plate 12 (can be disposed on the frame 2 together with the light source 11, for example, in the same direction as the LED strip as the light source 11 in the direction in which the length extends), ensuring that the light after multiple reflections can be incident on the light guide plate 12 On the opaque portion of the light guide pattern 121 on the back side.
  • the angle ⁇ between the reflective surface of the first retroreflective sheeting 14 and the plane parallel to the light exiting surface of the light guide plate 12 is 150°
  • the light is reflected on the opaque portion of the light guiding pattern 121 on the back surface of the light guide plate 12.
  • FIG. 2 is a schematic view of the optical path of the backlight module of FIG. 1. The working principle of the backlight module in this embodiment will be described below with reference to FIG.
  • the light guide plate 12 After the light emitted from the light source 11 enters the light guide plate 12 through the side surface (ie, the light incident surface) of the light guide plate 12, a part of the light is reflected by the opaque portion of the light guide pattern 121 on the back surface of the light guide plate 12 from the light guide plate 12.
  • the light exiting surface (the portion of the light belongs to the effective portion that is directly used), and the other portion of the light passes through the light transmitting portion (gap) of the light guiding pattern 121 to enter the light guide plate 12 and the light reflecting plate 13 (in this embodiment, the wedge shape) Within the area between the structures).
  • the light entering the region between the light guide plate 12 and the reflector 13 is reflected by the reflective surface of the reflector 13 (ie, first reflected), and part of the light (not shown) is returned to the inside of the light guide plate 12 through the gap.
  • the light is emitted from the light-emitting surface of the light guide plate 12, and the remaining light is reflected by the reflective surface of the light-reflecting plate 13 to the reflective surface of the first light-reflecting sheet 14 on the side of the light source 11.
  • the portion of the light reflected onto the reflective surface of the first retroreflective sheeting 14 is reflected by the first retroreflective sheeting 14 (ie, secondarily reflected) and is reflected to the second retroreflective sheeting opposite the reflective surface of the first retroreflective sheeting 14. 15 on the reflective surface.
  • the portion of the light reflected on the reflective surface of the second retroreflective sheet 15 passes through the reflection of the second retroreflective sheeting 15 (ie, the third reflection), and enters the light guide plate 12 from the side of the light guide plate 12 (ie, the light incident surface).
  • the inside is just reflected on the opaque portion of the light guiding pattern 121 on the back surface of the light guide plate 12, thereby being reflected by the light exiting surface of the light guide plate. This is repeated so that the light that is transmitted from the back surface of the light guide plate 12 can be utilized, the utilization ratio of the light emitted from the light source 11 is improved, the brightness of the backlight module is improved, and the power consumption is reduced.
  • the light guiding pattern from the back surface of the light guide plate is ensured by providing a reflecting unit (including a wedge-shaped reflector and a group of reflectors disposed opposite to each other at a certain angle of the light source).
  • the light transmitted through the gap is reflected by the multiple times and reaches the opaque portion of the light guiding pattern, thereby being reflected by the light emitting surface of the light guiding plate, so that the light emitted by the light source is fully utilized, and the light utilization in the backlight module is improved. rate.
  • the backlight module can use a lower power LED lamp as a light source, which reduces power consumption and saves cost.
  • the embodiment provides a backlight module.
  • the backlight module can greatly improve the utilization rate of light emitted by the light source under the premise of ensuring the uniformity of gray scale and uniformity by the arrangement of the reflection unit.
  • the structure of the light reflecting plate in the reflecting unit of the backlight module in this embodiment is different from the structure of the light reflecting plate in the first embodiment.
  • FIG. 3 is a cross-sectional view showing the structure of a backlight module according to an embodiment of the present invention.
  • the reflector 13 has a rectangular parallelepiped structure, and the reflective surface of the reflector 13 and the back of the light guide plate 12 Face relative setting.
  • FIG. 4 is a schematic view of the optical path of the backlight module of FIG. 3. As shown in FIG. 4, the working principle of the backlight module in this embodiment is completely the same as that of the backlight module in Embodiment 1, and will not be described in detail herein.
  • the other structures of the backlight module in this embodiment are the same as those of the backlight module of Embodiment 1, and will not be described in detail herein.
  • the light guiding pattern from the back surface of the light guide plate is ensured by providing a reflecting unit (including a rectangular parallelepiped reflecting plate and a reflecting sheet group which are oppositely disposed on both sides of the light source LED and fixed at an angle)
  • the light transmitted through the gap is reflected by the multiple times and reaches the opaque portion of the light guiding pattern, thereby being reflected by the light emitting surface of the light guiding plate, so that the light emitted by the light source is fully utilized, and the light utilization efficiency in the backlight module is improved.
  • the backlight module can use a lower power LED lamp as a light source, which reduces power consumption and saves cost.
  • the embodiment provides a backlight module.
  • the backlight module can greatly improve the utilization rate of the light source under the premise of ensuring the uniformity of gray scale and uniformity by the arrangement of the reflection unit.
  • the structure of the reflection unit of the backlight module in this embodiment is different from the structure of the reflection unit in Embodiment 1 or Embodiment 2.
  • FIG. 5 is a cross-sectional view showing the structure of a backlight module according to an embodiment of the present invention.
  • the reflecting unit in this embodiment includes a concave concentrating plate 130.
  • the concave surface of the concave concentrating plate 130 is disposed opposite to the back surface of the light guiding plate 12 for reflecting and concentrating the transmission from the gap of the light guiding pattern 121.
  • the focus of the concave concentrating sheet 130 i.e., the convergence point of the light reflected therefrom
  • the focus of the concave concentrating sheet 130 is located inside the light guide plate 12.
  • the design of the light guide plate 12 is designed such that the rear surface area of the light guide plate 12 corresponding to the focus is designed as a light transmitting portion (gap) of the light guiding pattern 121.
  • the focus of the concave concentrating plate 130 corresponds to the center of the light guide plate 12, and the central area of the back surface of the light guide plate 12 corresponding to the focus is a gap of the light guiding pattern 121.
  • the center point of the concave surface of the concave concentrating plate 130 and the surface of the back surface of the light guide plate 12 are The hearts are on the same line, ensuring that the light reflects and converges toward the center of the light panel 12.
  • the backlight module of the embodiment adopts a concave reflective surface instead of the planar reflective surface, thereby obtaining a better concentrating effect.
  • the structure is simpler.
  • the concave surface of the concave concentrating plate 130 has a curvature ranging from 5° to 10°, and a relatively large curved light structure can converge a large area of light.
  • FIG. 6 is a schematic diagram of an optical path of the backlight module of FIG. 5. The working principle of the backlight module in this embodiment will be described below with reference to FIG.
  • the light emitted from the light source 11 enters the light guide plate 12 from the side surface (ie, the light incident surface) of the light guide plate 12, a part of the light is reflected by the opaque portion of the light guide pattern 121 on the back surface of the light guide plate 12 from the light guide plate 12.
  • the light exiting surface (the portion of the light belongs to the effective portion that is directly utilized), and the other portion of the light passes through the gap of the light guiding pattern 121 into the region between the light guide plate 12 and the concave light collecting plate 130.
  • the light entering the area between the light guide plate 12 and the concave concentrating plate 130 is reflected by the concave concentrating plate 130.
  • the light is returned from the gap of the light guiding pattern 121 on the back surface of the light guide plate 12 to the inside of the light guide plate 12 and then emitted from the light emitting surface thereof.
  • This portion of the light can also be utilized, improving the utilization of light emitted by the light source 11, improving the brightness of the backlight module, and reducing energy consumption.
  • the backlight module of the embodiment by using the concave concentrating plate 130, the light which is transmitted from the gap of the light guiding pattern on the back surface of the light guiding plate is reflected and concentrated to the center of the inside of the light guiding plate 12 and then emitted from the light emitting surface thereof. , the effective use of light is realized, thereby improving the utilization of light in the backlight module.
  • the backlight module can use a lower power LED lamp as a light source, thereby reducing power consumption and saving cost.
  • the other structures of the backlight module in this embodiment are the same as those of the backlight module of Embodiment 1, and will not be described in detail herein.
  • Embodiment 1 - The backlight module in Embodiment 3 solves the problem of low utilization of light emitted by a light source in a backlight module by providing a reflection unit, thereby achieving high light utilization efficiency and reducing energy consumption. Reduced costs.
  • the embodiment provides a display device, including any of the backlight modules of Embodiment 1 to Embodiment 3.
  • the display device may be any product or component having a display function such as a liquid crystal panel, an electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • a display function such as a liquid crystal panel, an electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the backlight module in Embodiment 1 - Embodiment 3 is used, the light emitted by the light source is fully utilized, and the utilization of light in the backlight module is improved, so that the LED lamp with lower power can be used.
  • the cost is saved accordingly; especially for a portable mobile display device, power consumption can be reduced and the display device standby time can be prolonged.

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Abstract

一种背光模组和一种显示装置。该背光模组包括光源（11）和导光板（12），所述光源（11）设置于所述导光板（12）的入光面一侧，与所述导光板（12）的出光面相对的所述导光板（12）的背面设置有包括间隙的导光图纹（121）；所述背光模组还包括反射单元，所述反射单元用于将从所述导光板（12）的背面的所述导光图纹（121）的间隙中透过的光线反射回所述导光板（12）并从所述导光板（12）的出光面发出。

Description

背光模组和显示装置 技术领域
本发明属于显示技术领域，具体涉及一种背光模组和一种显示装置。
背景技术
目前，平板显示装置主要包括液晶显示装置和OLED(Organic Light-Emitting Diode，有机发光二极管)显示装置。液晶显示装置功耗很低，因此一经推出就备受消费者的青睐。
液晶显示装置主要包括液晶屏和背光模组。背光模组为设置于液晶屏的非显示侧、用来给液晶屏提供光源的部件。液晶屏中设置有液晶分子，通过电场驱动液晶分子的旋转，可调整每个像素(彩色像素或黑白像素)的透光量，从而实现图像显示。由于液晶分子本身并不发光，因此背光模组的发光效果将直接影响到液晶屏的显示效果。
背光模组中的光源可分为三类，分别为：点状光源，其主要采用LED(Light-Emitting Diode，发光二极管)灯作为发光光源，具有寿命长、低发热等优点，但亮度稍低；线光源，其主要采用CCFL(Cold Cathode Fluorescent Lamp，冷阴极荧光管)作为发光光源，具有亮度高、寿命长等优点，但发热严重；面光源，其主要采用VFD(扁平荧光灯)作为发光光源，具有亮度高、均匀度好等优点，但功耗较高。目前背光模组主要采用的光源为点状光源，即，使用LED灯作为光源。
通常，点状光源类背光模组包括：光源、导光板、扩散片和棱镜片等。背光模组中最核心的技术为导光板的光学设计，根据形状不同，可以将导光板分为平板型和楔形两类，目前主要采用楔形导光板。楔形导光板可以实现点光源到线光源、面光源的转换。为了实现灰度与均匀度的一致性，导光板的背面的导光图纹(pattern)通常采用不连贯排布方式设置，其包括不透光部分(用 于向导光板的出光面反射光线)和不透光部分之间的透光部分(间隙)。由于导光图纹的这种结构，部分光线会透过导光图纹的间隙散射到导光板后方(即，远离出光面)，导致光的实际利用率较低，而为了达到预期的亮度就必须增大LED灯的功率，造成能源浪费，并且成本较高。
因此，设计一种光利用率高的背光模组成为目前亟待解决的技术问题。
发明内容
针对现有技术中存在的上述不足，本发明的实施例提供了一种背光模组和一种显示装置，该背光模组中的光源发出的光能得到充分利用，提高背光模组中光的利用率，降低电能消耗，并节约了成本。
根据本发明的实施例，提供了一种背光模组，包括光源和导光板，所述光源设置于所述导光板的入光面一侧，所述导光板的出光面相对的所述导光板的背面设置有包括间隙的导光图纹，其中，所述背光模组还包括反射单元，所述反射单元用于将从所述导光板的背面的所述导光图纹的间隙中透过的光线反射回所述导光板中并从所述导光板的出光面发出。
优选的是，所述反射单元包括反光板和反光片组，所述反光板的反光面与所述导光板的背面相对设置，且所述反光板的有效反光面的面积不小于所述导光板的背面的面积；
所述反光片组包括设置于所述导光板和所述反光板的同一侧的第一反光片和第二反光片，所述第一反光片的反光面和所述第二反光片的反光面的至少部分能接收并反射来自对方的反射光，以使从导光板的背面的导光图纹的间隙中透过的光线依次经所述反光板、所述第一反光片和所述第二反光片反射后，从所述导光板的入光面进入所述导光板。
优选的是，所述导光板的背面相对其出光面倾斜设置、且采用从靠近所述光源侧向远离所述光源侧厚度渐薄的结构；
所述反光板的反光面与所述导光板的背面相对设置；
所述反光板为长方体形结构，或者，所述反光板采用从靠近所述光源侧向远离所述光源侧厚度渐厚的结构。
优选的是，所述第一反光片、所述第二反光片和所述光源设置于所述导光板的同一侧，所述第一反光片的底端位置不低于所述反光板的反光面，所述第二反光片的顶端位置不高于所述导光板的出光面。
优选的是，所述第一反光片和所述第二反光片相对地设置于所述光源的两侧，且所述第一反光片的反光面与所述第二反光片的反光面之间的夹角小于180°。
优选的是，所述第一反光片的反光面与平行于所述导光板的出光面的平面之间的夹角范围为100°～170°，所述第二反光片的反光面与平行于所述导光板的出光面的平面之间的夹角范围为10°～80°。
优选的是，所述第一反光片的反光面与平行于所述导光板的出光面的平面之间的夹角为150°，所述第二反光片的反光面与平行于所述导光板的出光面的平面之间的夹角为45°。
优选的是，所述第一反光片和所述第二反光片为平面镜或全反射光学膜片。
优选的是，所述反射单元包括凹面聚光板，所述凹面聚光板的凹面与所述导光板的背面相对设置，所述凹面聚光板的焦点位于所述导光板的内部、且所述焦点对应的所述导光板的背面区域为所述导光图纹的间隙。
优选的是，所述凹面聚光板中凹面的弧度范围为5°～10°。
优选的是，所述背光模组还包括扩散片和棱镜片，所述扩散片设置于所述导光板的出光面一侧，所述棱镜片设置于所述扩散片远离所述导光板的一侧。
根据本发明的实施例，还提供了一种显示装置，包括上述的背光模组。
本发明的有益效果是：该背光模组具有较高的光利用率，节 约成本；尤其对于便携式的移动显示装置，可以降低电能消耗，延长显示装置待机时间。
附图说明
图1为本发明实施例1提供的背光模组的结构剖示图。
图2为图1中背光模组的光路示意图。
图3为本发明实施例2提供的背光模组的结构剖示图。
图4为图3中背光模组的光路示意图。
图5为本发明实施例3提供的背光模组的结构剖示图。
图6为图5中背光模组的光路示意图。
图7为图1中背光模组的组装示意图。
具体实施方式
为使本领域技术人员更好地理解本发明的技术方案，下面结合附图和具体实施方式对本发明的背光模组和显示装置作进一步详细描述。
[实施例1]
本实施例提供一种背光模组，其光源为侧入式光源，即，光源设置于导光板的侧面。该背光模组通过反射单元的设置，在保证灰度与均匀度一致的前提下，能极大提高光源发出的光的利用率。
图1为本实施例提供的背光模组的结构剖示图。如图1所示，该背光模组包括光源11、导光板12、扩散片16、棱镜片17和反射单元。扩散片16设置于导光板12的出光面一侧，棱镜片17设置于扩散片16远离导光板12的一侧，光源11设置于导光板12的入光面一侧(即，光源11设置在导光板12的侧面)。在本实施例中，与导光板12的出光面相对的导光板12的背面设置有导光图纹121。为了实现灰度与均匀度的一致性，导光图纹121采用不连贯排布方式设置，其包括不透光部分(用于向导光板的出光 面反射光线)和不透光部分之间的透光部分(间隙)。反射单元用于将从导光板12的背面的导光图纹121的间隙中透过的光线反射回导光板12中并从其出光面发出。
具体的，本实施例中的反射单元包括反光板13和反光片组，反光板13的反光面与导光板12的背面相对设置，优选接近平行设置，且反光板13的有效反光面的面积不小于导光板12的背面的面积。反光片组包括设置于导光板12和反光板13的同一侧的第一反光片14和第二反光片15。第一反光片14的反光面和第二反光片15的反光面的至少部分能接收并反射来自对方的反射光，以使从导光板12的背面的导光图纹121的间隙中透过的光线依次经反光板13、第一反光片14和第二反光片15反射后，从导光板12的入光面进入导光板12。
优选的是，导光板12的背面相对其出光面倾斜设置，且导光板12采用从靠近光源11侧向远离光源11侧厚度渐薄的结构，即，导光板12为楔形结构。与导光板12的形状相似，反光板13也为楔形结构，反光板13采用从靠近光源11侧向远离光源11侧厚度渐厚的结构。反光板13的尺寸可以大于导光板12的尺寸，例如，反光板13可从与导光板12对应区域处延伸至光源11的下方，以尽可能避免遗漏任何从导光板12背面透过的光线。此外，导光板12与反光板13之间具体的距离由导光路径决定，可以根据设计要求调整。由于导光板12的背面与反光板13的反光面是相对且接近平行设置的，因此能保证在垂直于反光板13的反光面的方向上和倾斜于反光板13的反光面的方向上进入反光板13的光线均能被反射回导光板12并得到利用，从而提高了光源11发出的光的利用率。
这里，第一反光片14和第二反光片15可以为长条状，并且与光源11设置在导光板12的同一侧，即，均设置于导光板12的入光面一侧。第一反光片14的底端位置不低于反光板13的反光面，第二反光片15的顶端位置不高于导光板12的出光面。
如图1所示，第一反光片14和第二反光片15设置于导光板 的入光面一侧，且相对地设置于光源11的两侧，第一反光片14的反光面与第二反光片15的反光面之间的夹角小于180°。在本实施例中，光源11优选采用LED灯条；第一反光片14和第二反光片15优选为平面镜或全反射光学膜片，第一反光片14和第二反光片15优选采用框胶固定在光源11的两侧。
优选的是，第一反光片14的反光面与平行于导光板12的出光面的平面之间的夹角α的范围为100°～170°，第二反光片15的反光面与平行于导光板12的出光面的平面之间的夹角β的范围为10°～80°。参考图7，其为图1中的背光模组的组装示意图。如图7所示，基于导光板12的倾斜背面和反光板13的倾斜反光面(二者均处于棱镜片17的下方)，第一反光片14和第二反光片15以一定角度固定在边框2上(可与光源11一同设置于边框2上，例如按其长度延伸方向与作为光源11的LED灯条以相同的方向嵌入)，确保多次反射后的光线恰好能够入射到导光板12的背面的导光图纹121的不透光部分上。
进一步优选的是，第一反光片14的反光面与平行于导光板12的出光面的平面之间的夹角α为150°，第二反光片15的反光面与平行于导光板12的出光面的平面之间的夹角β为45°。即如图1所示，调整与第一反光片14有关的夹角α＝150°，与第二反光片15有关的夹角β＝45°，从而使得从第二反光片15进入导光板12的光线正好反射到导光板12背面的导光图纹121的不透光部分上。
图2为图1中背光模组的光路示意图。下面参考图2对本实施例中背光模组的工作原理进行说明。
从光源11发出的光线经导光板12的侧面(即，入光面)进入导光板12后，一部分光线被导光板12的背面的导光图纹121的不透光部分反射而从导光板12的出光面射出(该部分光线属于被直接利用的有效部分)，另一部分光线则透过导光图纹121的透光部分(间隙)进入导光板12与反光板13(本实施例中为楔形结构)之间的区域内。
进入导光板12与反光板13之间的区域内的光线，经反光板13的反光面的反射(即，第一次反射)，部分光线(未示出)经所述间隙返回导光板12内部并从导光板12的出光面射出，其余光线则被反光板13的反光面反射到位于光源11一侧的第一反光片14的反光面上。
反射到第一反光片14的反光面上的这部分光线经过第一反光片14的反射(即，第二次反射)，被反射到与第一反光片14的反光面相对的第二反光片15的反光面上。
被反射到第二反光片15的反光面上的这部分光线经过第二反光片15的反射(即，第三次反射)，从导光板12的侧面(即，入光面)进入导光板12的内部，并恰好被反射到导光板12的背面的导光图纹121的不透光部分上，从而被反射向导光板的出光面。如此反复，从而使得从导光板12的背面透出的光线也能够得到利用，提高了光源11发出的光的利用率，还提高了背光模组的亮度，并降低了能耗。
可见，在本实施例的背光模组中，通过设置反射单元(包括楔形反光板以及在光源两侧相对设置并以一定角度固定的反光片组)，确保从导光板的背面的导光图纹的间隙透出的光线被多次反射后到达导光图纹的不透光部分，从而被反射向导光板的出光面，从而使得光源发出的光得到充分利用，提高了背光模组中光的利用率。此外，在同等亮度条件下，该背光模组可采用功率较低的LED灯作为光源，降低了电能消耗，并节约了成本。
[实施例2]
本实施例提供一种背光模组，该背光模组通过反射单元的设置，在保证灰度与均匀度一致的前提下，能极大提高光源发出的光的利用率。本实施例中的背光模组的反射单元中的反光板的结构与实施例1中的反光板的结构不同。
图3为本实施例提供的背光模组的结构剖示图。如图3所示，反光板13为长方体形结构，反光板13的反光面与导光板12的背 面相对设置。
基于长方体形的反光板和基于楔形的反光板具有相同的反光面。图4为图3中背光模组的光路示意图。如图4所示，本实施例中背光模组的工作原理与实施例1中背光模组的工作原理完全相同，这里不再详述。
本实施例中背光模组的其他结构与实施例1的背光模组的对应结构相同，这里不再详述。
在本实施例的背光模组中，通过设置反射单元(包括长方体形反光板以及在光源LED两侧相对设置并以一定角度固定的反光片组)，确保从导光板的背面的导光图纹的间隙透出的光线被多次反射后到达导光图纹的不透光部分，从而被反射向导光板的出光面，从而使得光源发出的光得到充分利用，提高背光模组中光的利用率。此外，在同等亮度条件下，该背光模组可采用功率较低的LED灯作为光源，降低了电能消耗，并节约了成本。
[实施例3]
本实施例提供一种背光模组，该背光模组通过反射单元的设置，在保证灰度与均匀度一致的前提下，能极大提高光源利用率。本实施例中的背光模组的反射单元的结构与实施例1或实施例2中反射单元的结构不同。
图5为本实施例提供的背光模组的结构剖示图。如图5所示，本实施例中的反射单元包括凹面聚光板130，凹面聚光板130的凹面与导光板12的背面相对设置，用于反射和汇聚从导光图纹121的间隙透过的光线。在本实施例中，凹面聚光板130的焦点(即，从其反射的光线的汇聚点)位于导光板12的内部。在这种情况下，为防止光路被阻挡，进行导光板12的设计时会将与该焦点相对应的导光板12背面区域处设计为导光图纹121的透光部分(间隙)。
优选地，凹面聚光板130的焦点对应导光板12的中心，且导光板12的背面与该焦点对应的中心区域为导光图纹121的间隙。此时，凹面聚光板130的凹面的中心点与导光板12的背面的面中 心位于同一直线上，保证光线向导光板12的中心反射和汇聚。相对实施例1和实施例2，本实施例的背光模组中采用凹面反光面取代平面反光面，从而获得更好的聚光效果。同时，由于省略了反光片组的设置，其结构更简单。
优选的是，凹面聚光板130中凹面的弧度范围为5°～10°，通过较小弧度的凹面结构，可对较大面积的光线进行汇聚。
图6为图5中背光模组的光路示意图。下面参照图6对本实施例中的背光模组的工作原理进行描述。
光源11发出的光线从导光板12的侧面(即，入光面)进入导光板12后，一部分光线被导光板12的背面的导光图纹121的不透光部分反射而从导光板12的出光面射出(该部分光线属于被直接利用的有效部分)，另一部分光线透过导光图纹121的间隙进入导光板12与凹面聚光板130之间的区域内。
进入导光板12与凹面聚光板130之间的区域内的光线，被凹面聚光板130反射。如上所述，由于凹面聚光板130的焦点位于导光板12的内部，使得这部分光线从导光板12的背面的导光图纹121的间隙返回导光板12的内部并随后从其出光面发出，使得这部分光线也能够得到利用，提高了光源11发出的光的利用率，还提高了背光模组的亮度，并降低了能耗。
本实施例中的背光模组，通过采用凹面聚光板130，将从导光板的背面的导光图纹的间隙透出的光线反射、汇聚到导光板12内部的中心并随后从其出光面发出，实现了光的有效利用，从而提高了背光模组中光的利用率。此外，在同等亮度条件下，该背光模组可采用功率较低的LED灯作为光源，降低电能消耗，并节约了成本。
本实施例中背光模组的其他结构与实施例1的背光模组的对应结构相同，这里不再详述。
实施例1-实施例3中的背光模组，通过设置反射单元解决了背光模组中光源发出的光的利用率低的问题，实现了较高的光利用率，降低了能耗，同时也降低了成本。
[实施例4]
本实施例提供一种显示装置，包括实施例1-实施例3中任一种背光模组。
该显示装置可以为：液晶面板、电子纸、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。
在同等亮度条件下，由于采用实施例1-实施例3中的背光模组，使得光源发出的光得到充分利用，提高了背光模组中光的利用率，因此可采用功率较低的LED灯作为光源，相应节约了成本；尤其对于便携式的移动显示装置，可以降低电能消耗，延长显示装置待机时间。
可以理解的是，以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式，然而本发明并不局限于此。对于本领域内的普通技术人员而言，在不脱离本发明的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本发明的保护范围。

Claims (12)

  1. 一种背光模组，包括光源和导光板，所述光源设置于所述导光板的入光面一侧，与所述导光板的出光面相对的所述导光板的背面设置有包括间隙的导光图纹，其中，所述背光模组还包括反射单元，所述反射单元用于将从所述导光板的背面的所述导光图纹的间隙中透过的光线反射回所述导光板中并从所述导光板的出光面发出。
  2. 根据权利要求1所述的背光模组，其中，所述反射单元包括反光板和反光片组，所述反光板的反光面与所述导光板的背面相对设置，且所述反光板的有效反光面的面积不小于所述导光板的背面的面积；
    所述反光片组包括设置于所述导光板和所述反光板的同一侧的第一反光片和第二反光片，所述第一反光片的反光面和所述第二反光片的反光面的至少部分能接收并反射来自对方的反射光，以使从导光板的背面的导光图纹的间隙中透过的光线依次经所述反光板、所述第一反光片和所述第二反光片反射后，从所述导光板的入光面进入所述导光板。
  3. 根据权利要求2所述的背光模组，其中，
    所述导光板的背面相对其出光面倾斜设置、且采用从由靠近所述光源侧向远离所述光源侧厚度渐薄的结构；
    所述反光板的反光面与所述导光板的背面相对设置；
    所述反光板为长方体形结构，或者，所述反光板采用从靠近所述光源侧向远离所述光源侧厚度渐厚的结构。
  4. 根据权利要求2所述的背光模组，其中，所述第一反光片、所述第二反光片和所述光源设置于所述导光板的同一侧，所述第 一反光片的底端位置不低于所述反光板的反光面，所述第二反光片的顶端位置不高于所述导光板的出光面。
  5. 根据权利要求2所述的背光模组，其中，所述第一反光片和所述第二反光片相对地设置于所述光源的两侧，且所述第一反光片的反光面与所述第二反光片的反光面之间的夹角小于180°。
  6. 根据权利要求5所述的背光模组，其中，所述第一反光片的反光面与平行于所述导光板的出光面的平面之间的夹角的范围为100°～170°，所述第二反光片的反光面与平行于所述导光板的出光面的平面之间的夹角范围为10°～80°。
  7. 根据权利要求6所述的背光模组，其中，所述第一反光片的反光面与平行于所述导光板的出光面的平面之间的夹角为150°，所述第二反光片的反光面与平行于所述导光板的出光面的平面之间的夹角为45°。
  8. 根据权利要求2-7任一项所述的背光模组，其中，所述第一反光片和所述第二反光片为平面镜或全反射光学膜片。
  9. 根据权利要求1所述的背光模组，其中，所述反射单元包括凹面聚光板，所述凹面聚光板的凹面与所述导光板的背面相对设置，所述凹面聚光板的焦点位于所述导光板的内部、且所述焦点对应的所述导光板的背面区域为所述导光图纹的间隙。
  10. 根据权利要求9所述的背光模组，其中，所述凹面聚光板中凹面的弧度范围为5°～10°。
  11. 根据权利要求1-10任一项所述的背光模组，其中，所述背光模组还包括扩散片和棱镜片，所述扩散片设置于所述导光板 的出光面一侧，所述棱镜片设置于所述扩散片远离所述导光板的一侧。
  12. 一种显示装置，包括权利要求1-11任一项所述的背光模组。
PCT/CN2016/070096 2015-08-12 2016-01-05 背光模组和显示装置 Ceased WO2017024752A1 (zh)

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