WO2019052137A1 - 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
WO2019052137A1
WO2019052137A1 PCT/CN2018/079058 CN2018079058W WO2019052137A1 WO 2019052137 A1 WO2019052137 A1 WO 2019052137A1 CN 2018079058 W CN2018079058 W CN 2018079058W WO 2019052137 A1 WO2019052137 A1 WO 2019052137A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
slope
backlight module
angle
Prior art date
Application number
PCT/CN2018/079058
Other languages
English (en)
French (fr)
Inventor
张继兵
区可坚
Original Assignee
青岛海信电器股份有限公司
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 青岛海信电器股份有限公司 filed Critical 青岛海信电器股份有限公司
Publication of WO2019052137A1 publication Critical patent/WO2019052137A1/zh

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    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • 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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into 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, e.g. with collimating, focussing or diverging surfaces
    • 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
    • G02B6/0081—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
    • G02B6/0091—Positioning aspects of the light source relative to the light guide

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a backlight module and a display device.
  • a backlight module is a device for providing evenly distributed light to a display panel.
  • the backlight module generally includes a light source, a light guide plate, and a reflective sheet. As shown in FIG. 1 , it is a schematic structural view of a side-lit backlight module.
  • the light source 11 may be a light emitting diode located outside the light incident surface of the light guide plate 12.
  • the light guide plate 12 has a light exit surface for emitting uniform light and a bottom surface opposite to the light exit surface.
  • a plurality of dots 121 are disposed on the bottom surface, and the reflection sheet 13 is located outside the bottom surface of the light guide plate 12.
  • the light source 11 emits light from the light guide plate 12 to the light guide plate 12, and the light enters the light guide plate and then faces the two sides of the light guide plate, wherein the light that is incident on the light exit surface of the light guide plate is totally reflected. And the light that is incident on the bottom surface of the light guide plate and the light incident on the bottom surface of the light guide plate, the light that is directed to other areas except the mesh point will be totally reflected and emitted to the light exit surface of the light guide plate, and the light that hits the mesh point will be scattered, and the scattered light is partially scattered.
  • the light is emitted from the light-emitting surface of the light guide plate, and the other portion is directed from the bottom surface of the light guide plate toward the reflection sheet and is reflected by the reflection sheet to the light-emitting surface of the light guide plate.
  • a backlight module includes a light source, a light guide plate, and a reflective sheet; wherein the light source and the reflective sheet are located outside the light guide plate, and the light guide plate include:
  • a light emitting surface disposed opposite to the bottom surface and parallel to the bottom surface;
  • a light incident surface located at one side of the light guide plate, perpendicular to the bottom surface, and disposed opposite to the light source;
  • the second slope is disposed between the light incident surface and the bottom surface.
  • a display device comprising the backlight module of the first aspect.
  • FIG. 1 is a schematic structural view of a backlight module in the related art
  • FIG. 2 is a schematic diagram of an optical path of a backlight module in the related art
  • FIG. 3 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of another backlight module according to an embodiment of the present disclosure.
  • 5A is a schematic diagram of an optical path of the backlight module shown in FIG. 4;
  • FIG. 5B is another schematic diagram of an optical path of the backlight module shown in FIG. 4; FIG.
  • 5C is another schematic diagram of an optical path of the backlight module shown in FIG. 4;
  • 5D is another schematic diagram of an optical path of the backlight module shown in FIG. 4;
  • FIG. 5E is another schematic diagram of an optical path of the backlight module shown in FIG. 4.
  • FIG. 5E is another schematic diagram of an optical path of the backlight module shown in FIG. 4.
  • the structure of the light guide plate in the related art is as shown in FIG. Ideally, the light that is irradiated onto the bottom surface of the light guide plate without the dot portion should be totally reflected.
  • part of the light emitted by the light source 11 is, for example, the light A1 in FIG.
  • the light-emitting surface of the light guide plate 12 After being incident on the light guide plate 12 from the light-emitting surface of the light source 11, the light-emitting surface of the light guide plate 12 is directly incident at a small incident angle and directly emitted from the side of the light-emitting surface close to the light source 11, and some light rays (not shown) After entering the light guide plate 12 from the light emitting surface of the light source 11, the light guide plate 12 is incident on the bottom surface of the light guide plate 12 at a small incident angle, and the bottom surface of the light guide plate 12 is directed toward the reflection sheet 13, and is reflected by the reflection sheet 13 The side of the light-emitting surface 121 of the light guide plate 12 that is close to the light source is emitted. These rays cause a higher brightness of the light-emitting surface of the light guide plate 12 closer to the light source 11.
  • the bottom surface of the light guide plate is provided with a glue layer, and the glue layer directly adheres the reflection sheet to the bottom surface of the light guide plate. Since the refractive index of the adhesive layer is greater than the refractive index of the air, the critical angle of the interface between the bottom surface and the adhesive layer is larger than the critical angle of the interface between the light exit surface and the air. This causes light in the light guide plate to partially pass through the interface between the light guide plate and the adhesive layer to directly pass through the bottom surface of the light guide plate and illuminate the reflective sheet, and the reflective sheet reflects the light on the light exit surface of the light guide plate, so that the light guide plate emits light. A brighter area appears on the surface, which affects the uniformity of the light emitted by the backlight module.
  • the embodiment of the present disclosure provides a side-in type backlight module.
  • the structure of the side-entry backlight module can be as shown in FIG. 3 .
  • the backlight module may include a light source 21, a light guide plate 22, and a reflective sheet 23.
  • the light source 21 and the reflection sheet 23 are both located outside the light guide plate 22.
  • the light guide plate 22 includes a bottom surface 222 and a light exit surface 221 .
  • the bottom surface 222 and the light exit surface 221 are generally disposed in parallel.
  • the reflection sheet 23 is disposed on the bottom surface side of the light guide plate 22 and the bottom surface 222 of the light guide plate 22 in parallel with each other.
  • the light guide plate 22 further includes a first inclined surface P1, a light incident surface P3, and a second inclined surface P2 which are sequentially connected between the light emitting surface 221 and the bottom surface 222.
  • the light incident surface P3 is perpendicular to the bottom surface 222 and is disposed opposite to the light emitting surface of the light source 21 located outside the light guide plate 22.
  • the first inclined surface P1 is connected between the light-emitting surface 221 and the light-incident surface P3, and the second inclined surface P2 is connected between the light-incident surface P3 and the bottom surface 222.
  • the light incident surface P3 is not adjacent to the light exit surface 221 and the bottom surface 222.
  • the intersection of the plane where the first slope P1 is located and the plane where the second slope plane P2 is located is located outside the light guide plate 22, and the intersection line is parallel to the bottom surface 222.
  • the first inclined surface P1 and the second inclined surface P2 are configured such that light rays incident on the first inclined surface P1 at least partially from the light incident surface P3 are totally emitted on the first inclined surface P1, and at least partially incident on the second light incident surface P3 to the second The light of the inclined surface P2 is totally emitted at the second inclined surface P2, and the minimum incident angle of the light that hits the bottom surface 22 of the light guide plate 22 is greater than or equal to the critical angle at which the full emission occurs at the bottom surface 222.
  • one side of the light guide plate 22 is provided with two inclined surfaces P1 and P2.
  • the two inclined surfaces P1, P2 increase the incident angle of the light that is directed toward the bottom surface 222 of the light guide plate 22 such that the incident angle is greater than or equal to a critical angle at which the full emission occurs at the bottom surface, so that the light is in the guide
  • the bottom surface 222 of the light plate 22 is totally reflected, and does not directly pass through the bottom surface 222 toward the reflection sheet 23, so that a light-emitting area of the light-emitting surface 221 of the light guide plate 22 does not appear.
  • the embodiment of the present disclosure solves the problem that the light of the bottom surface of the light guide plate may directly pass through the bottom surface and be irradiated onto the reflective sheet, and the reflective sheet reflects the light exiting the light emitting surface of the light guide plate, so that the light emitting surface of the light guide plate appears.
  • a brighter area affects the uniformity of the light emitted by the backlight module, and achieves a uniform effect of the uniformity of the light emitted by the backlight module.
  • the light source 21 may be a point source or a surface source.
  • the light emitting surface P4 of the light source 21 can be disposed in parallel with the light incident surface P3.
  • the light source 21 can be a light emitting diode (LED).
  • the light source 21 can be composed of an LED and a quantum tube, which is a light source that emits light uniformly and has good heat dissipation performance.
  • a plurality of LEDs may be disposed on a printed circuit board (PCB) to form the light source 21, and the LEDs are disposed opposite to the light incident surface P3 of the light guide plate 22. The use of a plurality of LEDs to form the light source 21 provides strong light uniformity and high reliability.
  • the backlight module can include a light source 21, a light guide plate 22, a reflective sheet 23, and a glue layer 24.
  • the reflection sheet 23 is adhered to the bottom surface of the light guide plate 22 through the adhesive layer 24.
  • the light exit surface 221 and the bottom surface 222 of the light guide plate 22 are generally parallel to each other.
  • One side of the light guide plate 22 includes a first inclined surface P1, a light incident surface P3, and a second inclined surface P2 which are sequentially connected.
  • the light incident surface P3 is perpendicular to the bottom surface 222 and is disposed opposite to the light emitting surface P4 of the light source 21 provided outside the light guide plate 22.
  • the first inclined surface P1 is disposed between the light-emitting surface 221 of the light guide plate 22 and the light-incident surface P3.
  • the second inclined surface P2 is disposed between the light-incident surface P3 of the light guide plate 22 and the bottom surface 222, and the light-incident surface P3 is not opposite to the light-emitting surface 221. Adjacent to the bottom surface 222. The intersection of the plane where the first slope P1 is located and the plane where the second slope plane P2 is located is located outside the light guide plate 22, and the intersection line is parallel to the bottom surface 222.
  • At least one of the first inclined surface P1 and the second inclined surface P2 can cause the light source 21 to enter the light of the light guide plate 22, and the minimum incident angle of the light that is emitted from the first inclined surface P1 to the bottom surface 222 of the light guide plate 22 is greater than or equal to the bottom surface 222.
  • the minimum incident angle of the light incident on the bottom surface 222 of the light guide plate 22 is greater than or equal to the critical angle i g of the interface between the bottom surface 222 and the rubber surface 24, the light incident on the bottom surface 222 of the light guide plate 22 is totally reflected, instead of The interface between the light guide plate 22 and the rubber surface 24 is emitted.
  • one side of the light guide plate is provided with two inclined surfaces P1 and P2, and the two inclined surfaces can increase the incident angle of the light incident on the interface between the light guide plate 22 and the rubber surface 24 to make the incident.
  • the angle is greater than or equal to the critical angle i g of the interface between the bottom surface 222 and the rubber surface 24, so that the light is totally reflected at the interface between the light guide plate 22 and the rubber surface 24, and does not directly pass through the bottom surface 222 of the light guide plate 22.
  • a brighter region does not appear on the light-emitting surface 221 of the reflection sheet 23 and thus the light guide plate 22.
  • the embodiment of the present disclosure solves the problem that the light of the interface between the light guide plate and the adhesive layer may directly pass through the bottom surface of the light guide plate and illuminate the reflective sheet, and the reflective sheet reflects the light to the light emitting surface of the light guide plate.
  • the light-emitting surface of the light guide plate has a brighter area, which affects the uniformity of the light emitted by the backlight module, and achieves the uniformity of the light emitted by the backlight module.
  • FIG. 5A is a schematic diagram of an optical path of the backlight module shown in FIG. 4.
  • the light emitted from the light source 21 into the light guide plate 22 may include the light B 1 directly incident on the light exit surface 221 of the light guide plate 22, the light B 2 directly incident on the bottom surface 222 of the light guide plate 22, and reflected by the first inclined surface P1 and then incident on the light guide plate 22.
  • the light B 3 of the bottom surface 222 is reflected by the second inclined surface P2 and is incident on the light beam B 4 of the light exit surface 221 of the light guide plate 22. These rays can be continuously reflected in the light guide plate.
  • the first slope P1 and the second slope P2 in the backlight module can enable a part of the light incident on the first slope P1 or the second slope P2 to be generated on the first slope P1 or the second slope P2.
  • the total reflection enables the light to propagate in a direction away from the light source in the light guide plate, reducing the light exiting on the side of the light-emitting surface 221 of the light guide plate close to the light source, thereby reducing the occurrence of bright edges.
  • the light can be incident on the bottom surface 222 or the light exit surface 221 of the light guide plate 22 at a larger incident angle, thereby increasing the portion of the light.
  • the probability of total reflection inside the light guide plate 22 compared with the incident angle when incident on the first slope P1 and the second slope P2, the light can be incident on the bottom surface 222 or the light exit surface 221 of the light guide plate 22 at a larger incident angle, thereby increasing the portion of the light. The probability of total reflection inside the light guide plate 22.
  • FIG. 5B it is another schematic diagram of the optical path of the backlight module shown in FIG. This embodiment will be described with respect to the condition that the angle of the first inclined surface P1 is satisfied by the figure.
  • the light emitted by the light source 21 enters the light incident surface P3 and is refracted, and the incident angle of the light directly incident on the first inclined surface P1 is usually greater than or equal to the critical angle i a of the interface between the light guide plate 22 and the air, so that total reflection occurs. .
  • the first slope P1 is deflected by 1 degree counterclockwise from the position coplanar with the light exit surface 221, and the incident angle of the light directly irradiated to the first slope P1 is deflected by 1 degree counterclockwise.
  • the light emitted by the light source 21 is reflected by the first inclined surface P1 and is incident on the rubber surface of the bottom surface 222 and the rubber surface 24, and the incident angle is greater than or equal to the critical angle i. g , total reflection will occur without injecting the glue layer 24 from the bottom surface 222. That is, the light B 3 in FIG. 5A can be totally reflected in the light guide plate before being irradiated to the halftone dot.
  • the angle between the first slope P1 and the light exit surface 221 satisfies the first angle formula, and the first angle formula is: i 1 ⁇ (i g -i a )/2, where i 1 is the first slope and the light exit surface
  • the refractive index of the light guide plate is about 1.3
  • n 2 is the refractive index of the light guide plate 22 (which may be about 1.49)
  • i a is the critical angle of the interface between the light exit surface 221 and the air
  • i a arcsin(n 3 /n 2 )
  • n 3 is the refractive index of air (usually 1).
  • FIG. 5C it is another schematic diagram of the optical path of the backlight module shown in FIG.
  • the condition that the length L 1 of the first inclined surface P1 in the direction y perpendicular to the light incident surface P3 is satisfied will be described with reference to the drawing.
  • the incident angle k of the light that is incident on the connection position of the first slope P1 and the light exit surface 221 by the light source 21 in the direction x perpendicular to the light exit surface from the farthest end 211 of the light exit surface 221 (the lowest point 211 in the x direction) 1 is the light having the smallest incident angle in the light directly incident on the light-emitting surface 221, as long as the incident angle k 1 of the light is greater than or equal to the critical angle i g of the interface between the bottom surface 222 and the adhesive layer 24, then directly directed to the light-emitting surface 221
  • the incident angles are greater than or equal to the critical angle i g of the interface between the bottom surface 222 and the glue layer 24. That is, the light B 1 in FIG. 5A can be totally reflected in the light guide plate before being irradiated to the halftone dot.
  • the length L1 of the first slope P1 in the direction y perpendicular to the light incident surface satisfies the first length formula, and the first length formula is: L 1 ⁇ h 1 /tan ⁇ -s, where L 1 is the first slope in the vertical
  • h 1 is the farthest distance of the light source from the light exit surface 221 in the direction x perpendicular to the bottom surface, that is, the lowest point 211 of the light emitting surface P4 of the light source 21 in the x direction is from the light emitting surface.
  • FIG. 5D it is another schematic diagram of the optical path of the backlight module shown in FIG. In this embodiment, the condition that the angle of the second slope P2 is satisfied will be described with reference to the figure.
  • the light emitted by the light source 21 enters the light incident surface P3 and is refracted.
  • the incident angle of the light directly incident on the second inclined surface P2 is usually greater than or equal to the critical angle i a of the interface between the light exit surface 221 and the air, so that total reflection occurs.
  • the second inclined surface P2 is deflected by 1 degree clockwise from the position coplanar with the bottom surface 222, and the incident angle of the light directly irradiated to the second inclined surface P2 is deflected by 1 degree clockwise.
  • the incident angle of the light emitted from the light source 21 incident on the light exit surface 221 via the second slope P2 is i g '.
  • i g ' i g
  • i 2 (i g -i a )/2
  • i 2 is the angle between the second slope P1 and the bottom surface 222
  • i g is the critical angle of the interface between the bottom surface 222 and the glue layer
  • i a is the boundary of the interface between the light exit surface 221 and the air. angle.
  • the angle between the second slope P2 and the bottom surface 222 satisfies the second angle formula, and the second angle formula is: i 2 ⁇ (i g -i a )/2, where i 2 is the second slope P2 and the bottom surface 222
  • FIG. 5E is another schematic diagram of an optical path of the backlight module shown in FIG. 4.
  • the condition that the length L 2 of the second slope P2 in the direction y perpendicular to the light incident surface P3 is satisfied will be described with reference to the figure.
  • the incident angle k 2 of the light incident from the light source 21 in the direction x perpendicular to the bottom surface 222 from the most distal end 212 of the bottom surface 222 (the highest point 212 in the x direction) to the connection position of the second slope P2 and the bottom surface 222 is
  • the light having the smallest incident angle in the light directly incident on the bottom surface 222 is incident on the light directly incident on the bottom surface 222 as long as the incident angle k 2 of the light is greater than or equal to the critical angle i g of the interface between the bottom surface 222 and the rubber surface 24.
  • the angles are greater than or equal to the critical angle i g of the interface of the bottom surface 222 and the rubber surface 24. That is, the light B 2 in FIG. 5A can be totally reflected in the light guide plate before being irradiated to the halftone dot.
  • the length L 2 of the second slope P2 in the direction y perpendicular to the light incident surface satisfies the second length formula
  • the second length formula is: L 2 ⁇ h 2 /tan ⁇ -s, where L 2 is the second slope P2 In the direction perpendicular to the direction y of the light incident surface P3, h 2 is the farthest distance of the light source 21 from the bottom surface 222 in the direction perpendicular to the bottom surface 222, that is, the highest point 212 of the light emitting surface P4 of the light source 21 in the x direction.
  • the width of the light-emitting surface P4 of the light source 21 in the direction x perpendicular to the light-emitting surface 221 is less than or equal to the width of the light-incident surface P3, so as to avoid being perpendicular to the light-emitting surface 221 In the x direction, the light emitted from the light emitting surface P4 of the light source 21 is irradiated to the outside of the light guide plate 21, thereby avoiding waste of light energy.
  • the orthographic projection of the light-emitting surface P4 of the light source 21 on the plane of the light-incident surface P3 is located in the light-incident surface P3, so that the light emitted from the light-emitting surface P4 can be in the x-direction perpendicular to the light-emitting surface 221 and It is difficult to hit the outside of the light guide plate 21 in both directions perpendicular to the y direction of the light incident surface, and it is more effective to avoid waste of light energy.
  • the light emitting surface P4 of the light source 21 has a rectangular shape, and the orthographic projection of the light emitting surface P4 of the light source 21 on the plane of the light incident surface P3 is located at the center of the light incident surface P3.
  • the angle between the first slope P1 and the light exit surface 221 may be the same as the angle between the second slope P2 and the bottom surface 222, and the first slope P1 and the second slope P2 are parallel to the light exit surface 221.
  • the length is the same.
  • the distance between the light source 21, such as the light emitting surface, and the light incident surface P3 is less than 2 mm. Smaller distances also prevent light from hitting the outside of the light guide compared to larger distances.
  • the first slope P1 and the second slope P2 are symmetric with respect to a central axis plane between the light exit surface 221 and the bottom surface 222, wherein the central axis plane is the light exiting A plane between the surface 221 and the bottom surface 222 is equal to the distance between the light-emitting surface 221 and the bottom surface 222.
  • the central axis surface is a plane that is parallel to the light-emitting surface 221 and the bottom surface 222 between the light-emitting surface 221 and the bottom surface 222.
  • the first slope P1 and the second slope P2 are made by a grinding process, or the first slope P1 and the second slope P2 are formed by adjusting the spacing of the extrusion rollers when the light guide plate 22 is formed. .
  • the outer sides of the first slope P1 and the second slope P2 are provided with a light reflecting layer. Since the first inclined surface P1 and the second inclined surface P2 are formed after processing, the surface may not be smooth enough, which may cause a problem that the first inclined surface P1 and the second inclined surface P2 are difficult to perform normal reflection, and the reflective layer can avoid the problem. occur.
  • the light reflecting layer disposed outside the first inclined surface P1 and the second inclined surface P2 may be a silver plating layer or a laminated silver reflective layer.
  • the backlight module provided by the embodiment of the present disclosure may further include an optical film or the like, which is not limited in the embodiment of the present disclosure.
  • the embodiment of the present disclosure further provides a display device including the backlight module shown in FIG. 3 or the backlight module shown in FIG. 4 .
  • the display device may further include a display panel or the like, and the embodiment of the present disclosure does not limit the same.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种背光模组和显示装置，背光模组包括：光源（21）、导光板（22）和反射片（23）。导光板（22）的一侧与底面（222）垂直的入光面（P3），设置于入光面（P3）和出光面（221）之间的第一斜面（P1）以及设置于入光面（P3）和底面（222）之间的第二斜面（P2）。第一、第二斜面（P1，P2）所在平面的交线位于导光板（22）外部，且交线与底面（222）平行。第一、第二斜面（P1，P2）被配置使得至少部分光线在第一、第二斜面（P1，P2）发生全反射，并使得射向底面（222）的光线的入射角大于或等于底面（222）处的临界角（i g）。

Description

背光模组和显示装置
本申请要求于2017年9月15日提交中国专利局、申请号为201710832602.7、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申请中。
技术领域
本公开涉及显示技术领域，特别涉及一种背光模组和显示装置。
背景技术
该背景技术部分披露的内容仅是与本公开相关的技术，并不构成现有技术。
背光模组是一种用于向显示面板提供分布均匀的光线的器件。背光模组通常包括光源、导光板和反射片。如图1所示，其为一种侧入式的背光模组的结构示意图。光源11可以为发光二极管，其位于导光板12的入光面的外部，导光板12具有用于射出均匀的光线的出光面，以及与出光面相对的底面。底面设置有多个网点121，反射片13位于导光板12的底面的外部。在该背光模组启动后，光源11从导光板12的一侧向导光板12中射入光线，该光线在进入导光板后射向导光板的两面，其中射向导光板出光面的光线会发生全反射并射向导光板的底面，射向导光板底面的光线中，射向除网点外的其他区域的光线会发生全反射并射向导光板的出光面，射向网点的光线会发生散射，散射的光线一部分会从导光板的出光面射出，另一部分会从导光板的底面射向反射片并被反射片反射向导光板的出光面。
发明内容
根据本公开实施例的一个方面，提供了一种背光模组，所述背光模组包括光源、导光板和反射片；其中所述光源和反射片位于所述导光板的外部，所述导光板包括：
底面，与所述反射片相对设置；
出光面，与所述底面相对设置且与所述底面平行；
入光面，位于所述导光板的一侧，与所述底面垂直，并且与所述光源相对设置；
第一斜面，设置于所述入光面和所述出光面之间；
第二斜面，设置于所述入光面和所述底面之间。
根据本公开实施例的另一方面，提供一种显示装置，所述显示装置包括第一方面所述的背光模组。
在本公开的基础上，可以显而易见的获得更多的实施情形。应当理解的是，本公开的众多实施情形可以单独实施，也可以是一个或以上的实施情形的组合。本公开中给出的实施情形的表述是为了更好的描述呈现本公开，并不构成对本公开的限定。
附图说明
为了更清楚地说明本公开实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例而非所有可行的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是相关技术中一种背光模组的结构示意图；
图2是相关技术中的一种背光模组的光路示意图；
图3是本公开实施例提供的一种背光模组的结构示意图；
图4是本公开实施例提供的另一种背光模组的结构示意图；
图5A是图4所示背光模组的一种光路示意图；
图5B是图4所示背光模组的另一种光路示意图；
图5C是图4所示背光模组的另一种光路示意图；
图5D是图4所示背光模组的另一种光路示意图；
图5E是图4所示背光模组的另一种光路示意图。
通过上述附图，已示出本公开明确的实施例，后文中将有更详细的描述。这些附图和文字描述并不是为了通过任何方式限制本公开构思的范围，而是通过参考特定实施例为本领域技术人员说明本公开的概念。
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。
相关技术中的导光板的结构如附图1所示。理想状态下，光线照射到导光板底面上未设置网点部分的光线应该被全反射，但在相关技术中，如附图2所示，光源11发出的部分光线，例如图2中的光线A1，会在从光源11的发光面入射到导光板12后以较小的入射角直接射向导光板12的出光面并从出光面靠近光源11的一侧直接射出，还有部分光线(未示出)，会在从光源11的发光面入射到导光板12后以较小的入射角射向导光板12的底面，并穿出导光板12的底面射向反射片13，在经过反射片13反射后从导光板12的出光面121的靠近光源的一侧出射。这些光线会使导光板12的出光面的靠近光源11的一侧亮度较高。
相关技术的另一种背光模组中，导光板的底面设置有胶层，该胶层将反射片直接粘附在导光板的底面。由于胶层的折射率大于空气的折射率，因而底面与胶层的交界面的临界角比出光面与空气的交界面的临界角大。这导致导光板中，部分射向导光板与胶层的交界面的光线可能直接透过导光板的底面并照射到反射片上，而反射片会将光线反射向导光板的出光面，使得导光板的出光面出现一个较亮的区域，影响了背光模组射出的光线的均匀性。
本公开实施例提供了一种侧入式背光模组，该侧入式背光模组的结构可以如图3所示。该背光模组可以包括光源21、导光板22和反射片23。
所述光源21和反射片23均位于所述导光板22的外部。
所述导光板22包括底面222和出光面221。所述底面222与出光面221通常平行设置。所述反射片23设置在导光板22的底面侧与所述导光板22的底面222相互平行。
所述导光板22还包括出光面221和底面222之间依次连接的第一斜面P1、入光面P3以及第二斜面P2。所述入光面P3与底面222垂直，并与位于导光板22外部的光源21的发光面相对设置。第一斜面P1连接于出光面221与入光面P3之间，第二斜面P2连接于入光面P3与底面222之间。入光面P3并不与出光面221和底面222邻接。第一斜面P1所在平面和第二斜面P2所在平面的交线位于导光板22的外部，且该交线与底面222平行。第一斜面P1和第二斜面P2被配置使得，至少部分从入光面P3入射到所述第一斜面P1的光线在第一斜面P1发生全发射，至少部分从入光面P3入射到第二斜面P2的光线在第二斜面P2发生全发射，以及射向导光板22的底面22的光线的最小入射角大于或等于在该底面222处发生全发射的临界角。
本公开实施例提供的背光模组中，导光板22的一侧设置两个斜面P1、P2。这两个斜面P1、P2增大了射向所述导光板22的底面222的光线的入射角，使该入射角大于或等于在该底面处发生全发射的临界角，从而光线在所述导光板22的底面222发生全反射，而不会直接透过底面222射向反射片23，进而导光板22的出光面221也不会出现一个较亮的区域。由此，本公开实施例解决了相关技术中部分射向导光板底面的光线可能直接透过底面并照射到反射片上，而反射片会将光线反射向导光板的出光面，使得导光板的出光面出现一个较亮的区域，影响了背光模组射出的光线的均匀性的问题，并且实现了背光模组射出的光线的均匀性较强的效果。
在本公开实施例以及下述实施例中，光源21可以是点光源也可以是面光源。光源21的发光面P4可与入光面P3平行设置。在一些实施例中，光源21可以为发光二极管(light emitting diode，LED)。在一些实施例中，光源21可由LED和量子管构成，这是一种发光均匀且散热性能较好的光源。在本公开的一些实施例中，还可将多颗LED设置在印刷电路板(printed circuit board，PCB)上形成光源21，并将这些LED与导光板22的入光面P3相对设置。使用多颗LED构成光源21，可以提供较强的光线均匀性以及较高的可靠性。
如图4所示，为本公开实施例提供的另一种背光模组。该背光模组可以包括光源21、导光板22、反射片23以及胶层24。反射片23通过胶层24粘附在导光板22的底面。
导光板22的出光面221和底面222通常相互平行。导光板22的一侧包括依次连接着的第一斜面P1、入光面P3以及第二斜面P2。入光面P3与底面222垂直，并且与设置在导光板22外部的光源21的发光面P4相对设置。第一斜面P1设置于导光板22的出光面221和入光面P3之间，第二斜面P2设置在导光板22的入光面P3和底面222之间，入光面P3不与出光面221和底面222邻接。第一斜面P1所在平面和第二斜面P2所在平面的交线位于导光板22的外部，且该交线与底面222平行。
第一斜面P1和第二斜面P2中的至少一个斜面能够使光源21射入导光板22的光线中，从第一斜面P1射向导光板22的底面222的光线的最小入射角大于或等于底面222与胶面24的交界面的临界角i g。底面222与胶面24的交界面的临界角i g可以满足公式i g＝arcsin(n 1/n 2)，其中，i g是底面222与胶面24的交界面的临界角，n 1是胶层24的折射率，n 2是导光板22的折射率。在射向导光板22的底面222的光线的最小入射角大于或等于底面222与胶面24的交界面的临界角i g时，射向导光板22的底面222的光线均会发生全反射，而不会射出导光板22与胶面24的交界面。
本公开实施例提供的背光模组中，导光板的一侧设置两个斜面P1、P2，这两个斜面可以增大射向导光板22与胶面24的交界面的光线入射角，使该入射角大于或等于底面222与胶面24的交界面的临界角i g，从而光线在导光板22与胶面24的交界面发生全反射，而不会直接透过导光板22的底面222并射向反射片23，进而导光板22的出光面221也不会出现一个较亮的区域。由此，本公开实施例解决了相关技术中部分射向导光板与胶层的交界面的光线可能直接透过导光板的底面并照射到反射片上，而反射片会将光线反射向导光板的出光面，使得导光板的出光面出现一个较亮的区域，影响了背光模组射出的光线的均匀性的问题，并且达到了背光模组射出的光线的均匀性较强的效果。
图5A是图4所示背光模组的一种光路示意图。光源21照射进导光板22的光线可以包括直接射向导光板22的出光面221的光线B 1、直接射向导光板22的底面222的光线B 2、经第一斜面P1反射后射向导光板22的底面222的光线B 3、经第二斜面P2反射后射向导光板22的出光面221的光线B 4。这些光线可以在导光板中不断反射，当这些光线第一次照射到导光板22的底面222上时若能够发生全反射，则之后再次被反射到底面222时，仍能够发生全反射，除了照射到网点(图5A中未示出)的情况。
本公开实施例提供的背光模组中的第一斜面P1和第二斜面P2能够使得入射到第一斜面P1或第二斜面P2的光线中的一部分光线在第一斜面P1或第二斜面P2产生全反射，使得光线能在导光板内向远离光源的方向进行传播，减少了光线在导光板的出光面221的靠近光源的一侧的出射，减少了亮边的产生。与此同时，相比于入射到第一斜面P1和第二斜面P2时的入射角，光线能以更大的入射角入射到导光板22的底面222或出光面221，增加了这部分光线在导光板22内部进行全反射的概率。
如图5B所示，其为图4所示背光模组的另一种光路示意图。本实施例以该图对第一斜面P1的角度满足的条件进行说明。
光源21发出的光线在进入入光面P3并发生折射，直接射向第一斜面P1的光线的入射角通常大于或等于导光板22与空气的交界面的临界角i a，因而会发生全反射。第一斜面P1从与出光面221共面的位置每逆时针偏转1度，直接照射到第一斜面P1的光线的入射角就会逆时针偏转1度。在临界状态下，在光源21发出的光线经第一斜面P1反射后射向底面222与胶面24的交界面的入射角为临界角i g时，根据几何关系可知，u 2＝i 1+i a＝u 4，u 5＝i g-u 4＝u 6＝i 1，因此可知，i 1＝(i g-i a)/2，其中i 1为第一斜面P1与出光面221的夹角，i g为底面222与胶层的交界面的临界角，i a为出光面221与空气的交界面的临界角。因此，在i 1≥(i g-i a)/2时，光源21发出的光线经第一斜面P1反射后射向底面222与胶面24的胶面的入射角会大于或等于临界角i g，会发生全反射，而不会从底面222射入胶层24。即图5A中的光线B 3能够在照射到网点前在导光板内进行全反射。
因此，第一斜面P1与出光面221的夹角满足第一角度公式，第一角度公式为：i 1≥(i g-i a)/2，其中，i 1为第一斜面与出光面的夹角，i g为底面222与胶层的交界面的临界角，i g＝arcsin(n 1/n 2)，n 1是胶层24的折射率(胶层的折射率通常大于1且小于导光板的折射率，如1.3左右)，n 2是导光板22的折射率(可以为1.49左右)，而i a为出光面221与空气的交界面的临界角，i a＝arcsin(n 3/n 2)，其中n 3为空气的折 射率(通常为1)。
如图5C所示，其为图4所示背光模组的另一种光路示意图。本实施例以该图对第一斜面P1的在垂直于入光面P3的方向y上的长度L 1满足的条件进行说明。
由光源21在垂直于出光面的方向x上距离出光面221的最远端211(x方向上的最低点211)，射向第一斜面P1与出光面221的连接位置的光线的入射角k 1为直接射向出光面221的光线中入射角最小的光线，只要该光线的入射角k 1大于或等于底面222和胶层24的交界面的临界角i g，那么直接射向出光面221的光线在反射向底面222时，入射角均会大于或等于底面222和胶层24的交界面的临界角i g。即图5A中的光线B 1能够在照射到网点前在导光板内进行全反射。
由图5C示出的几何关系可知，α＝90°-k 1，tanα＝h 1/(L 1+s)，L 1＝h 1/tanα-s，L 1与k 1的值正相关，当k 1＝i g时，L 1为最小值，其中i g为底面222与胶层的交界面的临界角。即第一斜面P1在垂直于入光面的方向y上的长度L1满足第一长度公式，第一长度公式为：L 1≥h 1/tanα-s，其中，L 1为第一斜面在垂直于入光面的方向y上的长度，h 1为光源在垂直于底面的方向x上与出光面221的最远距离，即光源21的发光面P4在x方向上的最低点211距出光面221的距离，α＝90°-i g，i g为底面222与胶层的交界面的临界角，s为光源的发光面P4与导光板22的入光面P3的垂直距离。
如图5D所示，其为图4所示背光模组的另一种光路示意图。本实施例以该图对第二斜面P2的角度满足的条件进行说明。
光源21发出的光线进入入光面P3并发生折射，直接射向第二斜面P2的光线的入射角通常大于或等于出光面221与空气的交界面的临界角i a，因而会发生全反射，而第二斜面P2从与底面222共面的位置每顺时针偏转1度，直接照射到第二斜面P2的光线的入射角就会顺时针偏转1度。光源21发出的光线经第二斜面P2入射到出光面221的入射角为i g’。当光源21发出的光线经第二斜面P2和出光面221反射后射向底面222与胶面24的胶面的入射角为临界角i g，并且出光面221和底面222平行时，在临界状态下，i g’＝i g，根据几何关系可知，f 2＝i 2+i a＝f 4，f 5＝i g-f 4＝f 6＝i 2，因此可知，i 2＝(i g-i a)/2，其中i 2为第二斜面P1与底面222的夹角，i g为底面222与胶层的交界面的临界角，i a为出光面221与空气的交界面的临界角。因此，在i 2≥(i g-i a)/2时，光源21发出的光线经第二斜面P2反射后射向出光面221入射角会大于或等于导光板和胶层的交界面的临界角i g，并且，该光线经出光面221反射后射向底面222的入射角也大于或等于临界角i g，因此该光线在底面能够发生全反射，而不会从底面222射入胶层24。如此设置，图5A中的光线B 4能够在照射到网点前在导光板内进行全反射。
因此，第二斜面P2与底面222的夹角满足第二角度公式，第二角度公式为：i 2≥(i g-i a)/2，其中，i 2为第二斜面P2与底面222的夹角，i g为底面222与胶层的交界面的临界角，i g＝arcsin(n 1/n 2)，n 1是胶层24的折射率(胶层的折射率通常大于1且小于导光板的折射率，如1.3左右)，n 2是导光板22的折射率(可以为1.49左右)，而i a为出光面221与空气的交界面的临界角，i a＝arcsin(n 3/n 2)，其中n 3为空气的折射率(通常为1)。
如图5E所示，其为图4所示背光模组的另一种光路示意图。本实施例以该图对第 二斜面P2的在垂直于入光面P3的方向y上的长度L 2满足的条件进行说明。
由光源21在垂直于底面222的方向x上距离底面222的最远端212(x方向上的最高点212)，射向第二斜面P2与底面222的连接位置的光线的入射角k 2为直接射向底面222的光线中入射角最小的光线，只要该光线的入射角k 2大于或等于底面222和胶面24的交界面的临界角i g，那么直接射向底面222的光线的入射角均会大于或等于底面222和胶面24的交界面的临界角i g。即图5A中的光线B 2能够在照射到网点前在导光板内进行全反射。
由图5E示出的几何关系可知，α＝90°-k 2，tanα＝h 2/(L 2+s)，L 2＝h 2/tanα-s，L 2与k 2的值正相关，在k 2＝i g时，L 2为最小值。即第二斜面P2在垂直于入光面的方向y上的长度L 2满足第二长度公式，第二长度公式为：L 2≥h 2/tanα-s，其中，L 2为第二斜面P2在垂直于入光面P3的方向y上的长度，h 2为光源21在垂直于底面222的方向上与底面222的最远距离，即光源21的发光面P4在x方向上的最高点212距底面222的距离，α＝90°-i g，i g为底面222与胶层24的交界面的临界角，s为光源21的发光面P4与入光面P3的垂直距离。
在一些实施例中，所述光源21的发光面P4在垂直于所述出光面221的方向x上的宽度小于或等于所述入光面P3的宽度，这样能够尽量避免在垂直于出光面221的x方向上，光源21的发光面P4射出的光线照射到导光板21的外部，从而避免光能浪费。
在一些实施例中，光源21的发光面P4在入光面P3所在平面上的正投影位于入光面P3中，这样能够使从发光面P4射出的光线在垂直于出光面221的x方向以及垂直于入光面的y方向这两个方向上都难以射到导光板21的外部，更有效地避免光能浪费。
在一些实施例中，光源21的发光面P4呈矩形，且光源21的发光面P4在入光面P3所在平面上的正投影位于入光面P3的中央。如此设置光源21时，第一斜面P1与出光面221的夹角可以和第二斜面P2与底面222的夹角相同，且第一斜面P1与第二斜面P2在平行于出光面221的方向上的长度相同。
在一些实施例中，光源21，例如发光面，和入光面P3之间的距离小于2mm。与较大的距离相比，较小的距离也可以防止光线射到导光板外部。
在一些实施例中，所述第一斜面P1和所述第二斜面P2关于所述出光面221和所述底面222之间的中心轴面对称，其中该中心轴面即为在所述出光面221和所述底面222之间与所述出光面221和所述底面222距离相等的平面。当出光面221与与底面222平行时，中心轴面即为位于出光面221和底面222中间与出光面221和底面222平行的平面。
在一些实施例中，第一斜面P1和第二斜面P2由磨削工艺制成，或者，第一斜面P1和第二斜面P2为导光板22成形时通过调节挤压滚轮的间距挤压而成。
在一些实施例中，第一斜面P1和第二斜面P2的外侧设置有反光层。由于第一斜面P1和第二斜面P2在经过加工形成后，表面可能不够平滑，这可能产生第一斜面P1和第二斜面P2难以进行正常的反射的问题，而该反光层可以避免该问题的发生。
在一些实施例中，第一斜面P1和第二斜面P2外侧设置的反光层可以为银镀层或贴覆的银反射层。
此外，本公开实施例提供的背光模组还可以包括光学膜片等，本公开实施例不作 出限制。
此外，本公开实施例还提供一种显示装置，该显示装置包括图3所示背光模组或图4所示的背光模组。该显示装置还可以包括显示面板等组，本公开实施例不作出限制。
在本公开中，术语“第一”和“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。
本公开中的“垂直”和“平行”均非数学意义上的“垂直”和“平行”，而是在满足最终显示效果的前提下，“垂直”和“平行”相对于数学意义上的“垂直”和“平行”可以存在一定范围的误差。
以上所述仅为本公开的较佳实施例，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 (16)

  1. 一种背光模组，包括：光源、导光板和反射片；其中，所述光源和反射片位于所述导光板外部，所述导光板包括：
    底面，与所述反射片相对设置；
    出光面，与所述底面相对设置且与所述底面平行；
    入光面，位于所述导光板的一侧，与所述底面垂直，并且与所述光源相对设置；
    第一斜面，设置于所述入光面和所述出光面之间；
    第二斜面，设置于所述入光面和所述底面之间。
  2. 根据权利要求1所述的背光模组，其中，所述第一斜面和所述第二斜面的外侧设置有反光层。
  3. 根据权利要求2所述的背光模组，其中，所述反光层为银镀层或贴覆的银反射层。
  4. 根据权利要求1所述的背光模组，其中，在垂直于所述出光面的方向上，所述光源的发光面的宽度小于或等于所述入光面的宽度。
  5. 根据权利要求1所述的背光模组，其中，所述光源的发光面在所述入光面所在平面上的正投影位于所述入光面中。
  6. 根据权利要求1所述的背光模组，其中，所述光源的发光面呈矩形，且所述光源的发光面在所述入光面所在平面上的正投影位于所述入光面的中央。
  7. 根据权利要求1所述的背光模组，其中，所述第一斜面和所述第二斜面关于所述出光面和所述底面之间的中心轴面对称，其中所述中心轴面到所述出光面和所述底面的距离相等。
  8. 根据权利要求1所述的背光模组，其中，所述第一斜面和所述第二斜面由磨削工艺制成。
  9. 根据权利要求1所述的背光模组，其中，所述第一斜面和所述第二斜面为所述导光板成形时通过挤压滚轮挤压而成。
  10. 根据权利要求1所述的背光模组，其中，所述光源和所述入光面之间的距离小于2mm。
  11. 根据权利要求1所述的背光模组，其中，所述光源包括发光二级管。
  12. 根据权利要求1所述的背光模组，还包括胶层，其中所述反射片通过所述胶层粘附在所述导光板的所述底面，其中，从所述第一斜面射向所述导光板的底面的光线的最小入射角大于或等于所述导光板与所述胶层的交界面的临界角。
  13. 根据权利要求1所述的背光模组，其中，所述光源的发光面与所述入光面平行，
    所述第一斜面与所述出光面的夹角i 1满足第一角度公式，所述第一角度公式为：i 1≥(i g-i a)/2，其中，i 1为所述第一斜面与所述出光面的夹角，i g为所述底面与所述胶层的交界面的临界角，所述i a为所述出光面与空气的交界面的临界角；
    所述第一斜面在垂直于所述入光面的方向上的长度满足第一长度公式L 1，所述第一长度公式为：L 1≥h 1/tanα-s，其中，L1为所述第一斜面在垂直于所述入光面的方向上的长度，h 1为所述光源的发光面在垂直于所述底面的方向上与所述出光面的最远距离，α＝90°-i g，s为所述光源的发光面与所述入光面的垂直距离。
  14. 根据权利要求1所述的背光模组，其中，所述光源的发光面与所述入光面平行，
    所述第二斜面与所述底面的夹角满足第二角度公式，所述第二角度公式为：i 2≥(i g-i a)/2，其中，i 2为所述第二斜面与所述底面的夹角，i g为所述底面与所述胶层的交界面的临界角，i a为所述出光面与空气的交界面的临界角；
    所述第二斜面在垂直于所述入光面的方向上的长度满足第二长度公式，所述第二长度公式为：L 2≥h 2/tanα-s，其中，L 2为所述第二斜面在垂直于所述入光面的方向上的长度，h 2为所述光源的发光面在垂直于所述底面的方向上与所述底面的最远距离，α＝90°-i g，s为所述光源的发光面与所述入光面的垂直距离。
  15. 根据权利要求1所述的背光模组，其中，所述第一斜面所在平面和所述第二斜面所在平面的交线位于所述导光板的外部，且所述交线与所述底面平行，所述第一斜面和所述第二斜面被配置使得，至少部分从所述入光面入射到所述第一斜面的光线在所述第一斜面发生全发射，至少部分从所述入光面入射到所述第二斜面的光线在所述第二斜面发生全发射。
  16. 一种显示装置，包括权利要求1所述的背光模组。
PCT/CN2018/079058 2017-09-15 2018-03-14 背光模组和显示装置 WO2019052137A1 (zh)

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