WO2019196635A1 - 背光源装置、导光板以及显示装置 - Google Patents

背光源装置、导光板以及显示装置 Download PDF

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Publication number
WO2019196635A1
WO2019196635A1 PCT/CN2019/079463 CN2019079463W WO2019196635A1 WO 2019196635 A1 WO2019196635 A1 WO 2019196635A1 CN 2019079463 W CN2019079463 W CN 2019079463W WO 2019196635 A1 WO2019196635 A1 WO 2019196635A1
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WO
WIPO (PCT)
Prior art keywords
light
guide plate
light guide
toothed
recesses
Prior art date
Application number
PCT/CN2019/079463
Other languages
English (en)
French (fr)
Inventor
马一鸿
陈佳
肖立川
Original Assignee
京东方科技集团股份有限公司
成都京东方光电科技有限公司
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
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Application filed by 京东方科技集团股份有限公司, 成都京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US16/639,905 priority Critical patent/US11009647B2/en
Publication of WO2019196635A1 publication Critical patent/WO2019196635A1/zh

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—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
    • 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
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough 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
    • G02B6/0035—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
    • 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
    • G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk 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
    • G02B6/0033—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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened 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
    • G02B6/0035—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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a backlight device, a light guide plate, and a display device.
  • the bezel is usually designed to be narrow.
  • the frame is usually made of a white plastic frame, and a part of the light is diffusely reflected at the white plastic frame, causing the edge of the light guide plate to form a bright area, and in addition, light leakage may occur at the edge of the light guide plate. Bad brightness problem.
  • a backlight device includes: a light guide plate, a light source, and a bezel,
  • the light source is disposed at one end of the light guide plate and opposite to a side surface of the light guide plate; the plastic frame is disposed at least at an end of the light guide plate away from the light source, wherein a light emitting surface of the light guide plate is A plurality of toothed recesses are provided at one end away from the light source.
  • the plurality of toothed recesses are sequentially disposed in a first direction parallel to a light exit surface of the light guide plate and from an end of the light guide plate remote from the light source toward an end adjacent to the light source, And each of the toothed recesses extends in a second direction perpendicular to the light exiting surface of the light guide plate.
  • each of the toothed recesses on a plane formed by the first direction and the second direction is V-shaped, and the adjacent toothed recesses define a prismatic structure, the prismatic type
  • the shaped structure has two facets.
  • each of the toothed recesses has a first reflective surface adjacent to the light source and a second reflective surface remote from the light source, the first reflective surfaces of the respective toothed recesses being parallel to each other and the second reflective surface Parallel to each other.
  • the projections of the first reflective surface and the second reflective surface of each of the toothed recesses on a plane formed by the first direction and the second direction intersect and form a vertex angle.
  • the vertices of the apex angles of the plurality of toothed recesses are arranged on the apex line, and the apex angle line is parallel to the total reflection critical line of the second reflecting surface.
  • the total reflection threshold is based on a peak light wave in the source spectrum as a first reference.
  • the total reflection threshold is based on yellow light in the source spectrum as a second reference.
  • the first reflective surface is perpendicular to a light exit surface of a portion of the light guide plate other than the toothed recess, and the second reflective surface is disposed obliquely with respect to the first reflective surface.
  • an angle between the first reflective surface and the second reflective surface is an acute angle.
  • the maximum depth of the toothed recess gradually decreases in the first direction.
  • a side of the light guide plate facing away from the light-emitting surface is provided with a reflective plate parallel to the light guide plate, the dots of the light guide plate are arranged in columns, and the spacing between two adjacent rows of light guide plates Gradually decreasing along the first direction, a projection of the plurality of toothed recesses on the reflector is between a first column of dots and a second column of dots along the first direction.
  • the projection of the plurality of toothed recesses on the reflector covers a projection of the first column of dots and the second column of dots on the reflector.
  • a light guide plate wherein a light-receiving surface of the light guide plate is formed with a plurality of tooth-shaped recesses formed at an end of the light guide plate remote from a light source .
  • the plurality of toothed recesses are sequentially disposed in a first direction extending parallel to the light exiting surface of the light guide plate and extending from an end of the light guide plate away from the light source toward an end adjacent to the light source, and each of the toothed concave portions is along The second direction extends perpendicular to the light exit surface of the light guide plate.
  • the plurality of the toothed recesses are similar in shape, and the adjacent toothed recesses define a prismatic structure having two facets.
  • the projection of each of the toothed recesses in a plane formed by the first direction and the second direction is a V shape, and an apex angle of the V shape is an acute angle.
  • the maximum depth of the plurality of toothed recesses gradually decreases in the first direction.
  • each of the toothed recesses has a first reflecting surface adjacent to the light source and a second reflecting surface remote from the light source, the first reflecting surfaces of the respective toothed recesses being parallel to each other and the second reflecting The faces are also parallel to each other.
  • the projections of the first reflective surface and the second reflective surface of each of the toothed recesses on a plane formed by the first direction and the second direction intersect and form a vertex angle.
  • the vertices of the apex angles of the plurality of toothed recesses are arranged on the apex line, and the apex angle line is parallel to the total reflection critical line of the second reflecting surface.
  • a display device including the above backlight device is provided.
  • FIG. 1 is a schematic structural view of a backlight device according to an embodiment of the present disclosure
  • Figure 2 is a partial enlarged view of the portion E in Figure 1;
  • FIG. 3 is a schematic view of a toothed recess according to an embodiment of the present disclosure
  • FIG. 4 is a schematic view of a toothed recess in which a plurality of sets of rays are shown in a path of a first reflective surface and a second reflective surface of the toothed recess, in accordance with an embodiment of the present disclosure
  • FIG. 5 is a schematic illustration of a plurality of toothed recesses showing paths of multiple sets of rays at a first reflective surface and a second reflective surface of a plurality of toothed recesses in accordance with an embodiment of the present disclosure.
  • a backlight device 100 according to an embodiment of the present disclosure will be described below with reference to FIGS. 1 through 5.
  • the backlight device 100 includes a light source 1, a light guide plate 2, and a bezel 3.
  • the light source 1 is used to emit light to the light guide plate 2, the light source 1 is disposed at one end of the light guide plate 2, and the light source 1 is opposite to the side surface of the light guide plate 2, and is emitted from the light source 1.
  • Light can be transmitted in the light guide plate 2.
  • the light source 1 may be an LED (Light Emitting Diode) or a CCFL (Cold Cathode Fluorescent Lamp), and may be selected according to requirements.
  • the light source 1 may be disposed at a side portion of the light guide plate 2 or may be disposed under the light guide plate 2.
  • the present disclosure is described by taking a light source 1 disposed at a side portion of the light guide plate 2 (refer to FIG. 1) as an example. It should be understood that the plastic frame 3 in FIG. 1 is only partially shown to facilitate the description of the present disclosure.
  • the plastic frame 3 is disposed at least at an end of the light guide plate 2 remote from the light source 1.
  • the light-emitting surface of the light guide plate 2, that is, the end of the upper surface away from the light source 1 is provided with a plurality of tooth-shaped recesses 21.
  • the light guide plate 2 when the light source 1 emits light, the light can be transmitted through the light guide plate 2, and part of the light is emitted from the upper surface of the light guide plate 2 by the light guide plate 2, and part of the light is irradiated on the plastic frame 3. Reflection (reflection is diffuse reflection) occurs on the side wall of the plastic frame 3 facing the light source 1, and the reflected light can be transmitted to the light guide plate 2 again.
  • the light may be emitted from the upper surface of the light guide plate 2 by multiple refractions or reflections in the light guide plate 2.
  • the direction of propagation of the other portion of the light may be changed and emitted toward the bottom surface of the light guide plate 2, thereby
  • the light is effectively prevented from penetrating from the gap between the light guide plate 2 and the bezel 3, so that the problem of light leakage and brightening of the edge of the backlight device 100 can be better prevented.
  • the light diffused and reflected by the frame 3 may be incident on the toothed recess 21, and may be emitted from the upper surface of the light guide plate 2 when the light is refracted in the toothed recess 21, or may be incident on the toothed recess 21 Another toothed recess 21 adjacent to it.
  • the propagation path of the light is related to the angle at which the light is incident on the toothed recess 21, and the different incident angles of the light correspond to different propagation paths.
  • the toothed concave portion 21 when the light is incident on the toothed concave portion 21, the toothed concave portion 21 changes the direction in which the light is propagated, so that the light propagates toward the upper or lower surface of the light guide plate 2, so that the light source 1 can be reduced from being emitted and propagated to the light source 1
  • the light of the bezel 3 further better prevents light leakage and brightening problems at the edges of the backlight device 100.
  • the backlight device 100 of the embodiment of the present disclosure by providing a plurality of tooth-shaped recesses 21 on the side of the light guide plate 2 close to the plastic frame 3, the light reflected by the sidewall of the plastic frame 3 can be refracted or reflected, so that the light is made.
  • the lower surface of the light guide plate 2 is emitted or emitted from the upper surface of the light guide plate 2, so that light can be effectively reduced from the gap between the light guide plate 2 and the bezel 3, and the edge of the backlight device 100 is prevented from being leaked and emitted.
  • Bright question by providing a plurality of tooth-shaped recesses 21 on the side of the light guide plate 2 close to the plastic frame 3, the light reflected by the sidewall of the plastic frame 3 can be refracted or reflected, so that the light is made.
  • the lower surface of the light guide plate 2 is emitted or emitted from the upper surface of the light guide plate 2, so that light can be effectively reduced from the gap between the light guide plate 2 and the bezel 3, and the
  • the direction parallel to the upper surface (or lower surface) of the light guide plate 2 and from the end of the light guide plate 2 away from the light source 1 toward the end adjacent to the light source 1 is the first In the direction, the plurality of toothed recesses 21 are sequentially arranged in the first direction and each of the toothed recesses 21 extends in the second direction, the second direction being perpendicular to the upper surface of the light guide plate, so that a plurality of tooth shapes can be formed
  • the recesses 21 are arranged in a zigzag shape, which also facilitates the cooperation between the plurality of toothed recesses 21, thereby better interfering with the direction of propagation of the light.
  • the plurality of toothed recesses 21 can be better interfered with the direction of light propagation by adopting such an arrangement.
  • the light is directed toward one of the toothed recesses 21, the light is reflected or refracted at the surface of the toothed recess 21 and can then be directed toward the other toothed recess 21, the arrangement of the plurality of toothed recesses 21 being more comprehensive to the light.
  • the intervention and the configuration of the toothed recess 21 are simple, so that problems such as leakage of light from the edge of the backlight device 100 can be better prevented.
  • each of the toothed recesses 21 is V-shaped, and the adjacent toothed recesses 21 define a prismatic structure 213 having two facets. Among them, the light can be reflected or refracted on the two prismatic faces.
  • the projection of the toothed concave portion 21 in FIG. 1 on a plane formed by the first direction and the second direction is a prism-like bottom surface.
  • the toothed recess 21 has a simple structure and facilitates reflection or refraction of the ribs against the light, so that the toothed recess 21 has a better guiding effect on the light.
  • the light guide plate 2 can be made of acrylic (specially treated plexiglass) or PC plate (polycarbonate hollow plate), and the shape of the light guide plate 2 can be processed according to the size required for the design, and the structure of the toothed concave portion 21 is simple. It facilitates the manufacture of the light guide plate 2.
  • each of the toothed recesses 21 has a first reflecting surface 211 close to the light source 1 and a second reflecting surface 212 away from the light source 1, the first of each of the toothed recesses 21
  • the reflecting surfaces 211 are parallel to each other, and the second reflecting surfaces 212 of the respective toothed recesses 21 are also parallel to each other.
  • the light can be refracted or reflected on the first reflective surface 211 and the second reflective surface 212 to perform the light propagation direction under the action of the first reflective surface 211 and the second reflective surface 212 of the plurality of toothed recesses 21 Intervention.
  • the light ray a and the light ray b are directed to the first reflecting surface 211 of one of the toothed recesses 21, and the light ray a and the light ray b are at the first reflecting surface 211. It is refracted and emitted from the first reflecting surface 211.
  • the light ray a is emitted toward the upper surface of the light guide plate 2
  • the light ray b is refracted and then directed toward the second reflective surface 212
  • the light ray b is reflected on the second reflective surface 212 after being refracted, and the reflected light ray b
  • the light is emitted toward the upper surface of the light guide plate 2.
  • the light When the light is incident on the toothed concave portion 21, under the action of the first reflecting surface 211 and the second reflecting surface 212, the light can be emitted from the direction toward the upper surface of the light guide plate 2, thereby interfering with the direction of propagation of the light. Further, it is possible to better prevent the occurrence of problems such as light leakage from the edge of the backlight device 100.
  • the light ray c, the light ray d, and the light ray e are incident on the second reflecting surface 212 of the toothed concave portion 21, and the light ray c, the light ray d, and the light ray e are in the tooth shape.
  • the second reflecting surface 212 of the recess 21 is reflected, and the light ray c, the light ray d, and the light ray e are reflected to the first reflecting surface 211 of the other toothed concave portion 21, and then both are refracted at the first reflecting surface 211.
  • the light ray e is finally refracted by the first reflecting surface 211 and then emitted along the e direction;
  • the light ray d is refracted by the first reflecting surface 211 and is incident on the second reflecting surface 212, and is reflected by the second reflecting surface 212 and then ejected along the direction d.
  • the light c is refracted by the first reflecting surface 211 and then directed toward the second reflecting surface 212, and is refracted by the second reflecting surface 212, and is directed toward the bottom surface of the light guide plate 2 along c.
  • the plurality of toothed recesses 21 are similar in shape, that is, the shapes of the plurality of toothed recesses 21 may be enlarged or reduced in proportion, and the light may be emitted from one toothed recess 21 to the other.
  • the recessed portion 21, the similarly shaped arrangement of the plurality of toothed recesses 21 also facilitates cooperation between the plurality of toothed recesses 21, so that the plurality of toothed recesses 21 can better interfere with the direction of propagation of the light.
  • the projection of the first reflective surface 211 and the second reflective surface 212 of each of the toothed recesses 21 in a plane formed by the first direction and the second direction The intersection forms an apex angle, and the vertices of the plurality of apex angles are arranged in a straight line, that is, the apex line m (i.e., the dashed line of the plurality of apex lines in Fig. 5).
  • the vertex line m is parallel to the total reflection threshold n of the second reflecting surface 212 (as shown in FIG. 5).
  • the angle between the total reflection critical line n and the normal of the second reflection surface 212 is a total reflection critical angle.
  • the incident angle of the incident light on the second reflection surface 212 is greater than or equal to the total reflection critical angle, Then, the incident light is totally reflected.
  • the incident angle of the incident light on the second reflecting surface 212 is less than the total reflection critical angle, a part of the incident light is reflected, and a part of the incident light is refracted.
  • the bottom ends of the plurality of toothed recesses 21 are connected and located in the same plane, and the same plane and the tooth-shaped concave portion 21 of the light guide plate 2 are The upper surfaces of the outer portions are coplanar, so that the plurality of toothed recesses 21 can better interfere with the direction of propagation of the light, and the structure of the light guide plate 2 is simple and easy to manufacture.
  • the angle formed by the total reflection critical line n and the second reflection surface 212 is the total reflection area A.
  • the angle between the direction in which the incident light is incident on the second reflecting surface 212 and the second reflecting surface 212 is in the range of the total reflection area A, the light is totally reflected by the second reflecting surface 212, that is, is directed to the corresponding total reflection area A. .
  • the toothed recess 21 further includes a refractive area B, a refractive area C, and a refractive area D.
  • the angle of incident light entering the second reflecting surface 212 is in the refractive area B
  • the light is emitted from the corresponding refractive area B
  • the angle of the incident light entering the second reflecting surface 212 is in the refractive area C
  • the light is refracted from the corresponding The region C is emitted
  • the angle at which the incident light rays enter the second reflecting surface 212 is in the refractive region D
  • the light is emitted from the corresponding refractive region D.
  • the angle between the incident light and the second reflecting surface 212 is in the range of the refractive area B, the refractive area C, and the refractive area D
  • the light is refracted.
  • the propagation of the light is reversible, that is, when the light is emitted from the total reflection area A to the second reflection surface 212, the light is emitted from the total reflection area A; when the light is from the refraction area B, the second reflection is emitted.
  • the surface 212 is, the light is emitted from the total reflection area B; when the light is emitted from the refractive area C to the second reflection surface 212, the light is emitted from the total reflection area C; when the light is emitted from the refractive area D to the second reflection surface 212 The light is emitted from the total reflection area D.
  • the total reflection critical line n is the first reference reference in the wave spectrum of the light source spectrum, so that the range of reflection or refractive angle of the light can be adjusted, so that the toothed recess 21 can be better The direction of light propagation interferes.
  • the total reflection critical line n is based on the yellow light in the source spectrum as a second reference reference, so that the reflection or refractive angle range of the light can be better adjusted, and the toothed recess 21 can be further Good intervention in the direction of light propagation.
  • the second reference reference may be light having a difference between the wavelength of the yellow light within a certain set range, that is, light near the yellow light, and the setting range is set by a person skilled in the art as needed.
  • the first reflective surface 211 is perpendicular to the upper surface of the portion of the light guide plate 2 except the toothed concave portion 21, so that the light is on the first reflective surface 211.
  • the reflection or refraction effect on the upper side is simpler, and it is easy to calculate the guiding direction of the light-shaped concave portion 21 with respect to the light, and further, the production of the light guide plate 2 is facilitated due to the simple structure.
  • the angle between the second reflecting surface 212 and the first reflecting surface 211 is an acute angle, so that the structure of the toothed recess 21 is simpler, and the setting of the acute angle facilitates the light.
  • the toothed recess 21 is better propagated and can guide the light more precisely.
  • the maximum depth of the plurality of toothed recesses 21 gradually decreases in the first direction, and the maximum depth of the toothed recesses 21 can be understood as the distance of the teeth of the toothed recesses 21 from the light guide plate 2.
  • the arrangement in which the plurality of toothed recesses 21 are gradually reduced in depth may be such that light rays that are directed toward the toothed recesses 21 from the side far from the light source 1 are gradually guided by the toothed recesses 21, which are incident on the lower surface of the light guide plate 2 or along the light guide plate 2.
  • the guiding effect of the light by the toothed concave portion 21 causes the light to be emitted toward the upper surface of the light guide plate 2 (refer to FIG. 4).
  • a reflector 4 disposed in parallel with the light guide plate 2 is disposed under the light guide plate 2 , and the dots 22 of the light guide plate 2 are arranged in columns, and the adjacent two rows of dots 22 are arranged. The spacing between them decreases in a first direction, and the projection of the toothed recess 21 on the reflecting plate 4 is located between the first row of dots 22 and the second row of dots 22 in the first direction.
  • the projection of the plurality of toothed recesses 21 on the reflecting plate 4 covers the projection of the first column of dots 22 and the second row of dots 22 on the reflecting plate 4, so that the light guiding plate 2 better propagates the light.
  • the reflected light propagates toward the respective angles, and then the reflective condition is ejected from the upper surface of the light guide plate 2.
  • the light guide plate 2 can be uniformly illuminated by providing various kinds of dense and different mesh points, and the reflection plate 4 can reflect the light that is incident on the reflection plate 4 to the light guide plate 2, thereby improving the practical efficiency of the light. In the case of luminance, the luminous efficiency is higher and the power consumption is low.
  • the light-emitting surface of the light guide plate 2 (i.e., the upper surface of the light guide plate 2 in the drawing) is formed with a tooth-shaped recess 21, and the tooth-shaped recess 21 is first at the light guide plate 2.
  • the plurality of toothed recesses 21 are sequentially arranged in the first direction and each of the toothed recesses 21 extends in the second direction of the upper surface of the vertical light guide plate 2, and the plurality of the toothed recesses 21 are similar in shape
  • Each of the toothed recesses 21 has a prismatic shape.
  • the toothed recess 21 can guide the light, thereby facilitating the guiding of the light to the lower surface of the light guide plate 2 along the upper surface of the light guide plate 2, so that the light guide plate 2 emits light more evenly.
  • the light guiding effect of the light guide plate 2 is improved.
  • the maximum depth of the plurality of toothed recesses 21 is sequentially decreased in the first direction, and the toothed recesses 21 can be directed toward the toothed recesses 21.
  • the light is reflected or refracted multiple times to better direct the light.
  • a display device includes the backlight device 100 described above.
  • the display device 100 may be a display panel, a display terminal including a display panel, or a part of the display panel.
  • the display effect of the display device can be improved, thereby improving the user experience.

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Abstract

一种背光源装置（100）、导光板（2）和显示装置，其中背光源装置（100）包括导光板（2）、光源（1）和胶框（3），光源（1）设置在导光板（2）的一端且与导光板（2）的侧面相对；胶框（3）至少设置在导光板（2）的远离光源（1）的一端；导光板（2）的出光表面上远离光源（2）的一端设置有多个齿形凹部（21）。齿形凹部（21）的布置，可以更好地防止光线从背光源装置（100）的边缘处漏出。

Description

背光源装置、导光板以及显示装置
相关申请的交叉引用
本申请要求于2018年4月12日递交中国专利局的、申请号为201810327414.3的中国专利申请的权益，该申请的全部公开内容以引用方式并入本文。
技术领域
本公开涉及显示屏技术领域，具体而言，涉及一种背光源装置、导光板以及显示装置。
背景技术
随着技术进步和发展，诸如手机、平板电脑之类的显示装置的显示模组趋向高屏占比的设计，因此边框通常设计成较窄。在相关技术的窄边框中，边框通常由白色胶框制成，一部分光线在白色胶框处发生漫反射，导致导光板的边缘形成偏亮的区域，此外，在导光板的边缘还会发生漏光等亮度不良问题。
公开内容
根据本公开的一个方面，提供一种背光源装置，包括：导光板、光源和胶框，
所述光源设置在所述导光板的一端且与所述导光板的侧面相对；所述胶框至少设置在所述导光板的远离所述光源的一端，其中，所述导光板的出光表面上远离所述光源的一端设置有多个齿形凹部。
在一些实施例中，所述多个齿形凹部沿与所述导光板的出光表面平行且从所述导光板的远离所述光源的一端朝向邻近所述光源的一端的第一方向依次 分布，且每个齿形凹部沿垂直于所述导光板的出光表面的第二方向延伸。
在一些实施例中，每个所述齿形凹部在所述第一方向和第二方向形成的平面上的投影为V形，相邻的齿形凹部限定出类棱柱形结构，所述类棱柱形结构具有两个棱面。
在一些实施例中，每个齿形凹部均具有靠近所述光源的第一反射面和远离所述光源的第二反射面，各个齿形凹部的第一反射面相互平行且第二反射面也相互平行。
在一些实施例中，每个所述齿形凹部的所述第一反射面和所述第二反射面在所述第一方向和第二方向形成的平面上的投影相交并形成顶角，所述多个齿形凹部的顶角的顶点排列在顶角线上，所述顶角线平行于所述第二反射面的全反射临界线。
在一些实施例中，所述全反射临界线以所述光源波谱中的波峰光波为第一参考基准。
在一些实施例中，所述全反射临界线以所述光源波谱中的黄光为第二参考基准。
在一些实施例中，所述第一反射面垂直于所述导光板的除齿形凹部外的部分的出光表面，所述第二反射面相对于所述第一反射面倾斜设置。
在一些实施例中，所述第一反射面与所述第二反射面之间的夹角为锐角。
在一些实施例中，所述齿形凹部的最大深度沿所述第一方向逐渐减小。
在一些实施例中，所述导光板的背离出光表面的一侧设有与所述导光板平行的反射板，所述导光板的网点呈列设置，且相邻两列导光板之间的间距沿所述第一方向逐渐减小，所述多个齿形凹部在所述反射板上的投影位于沿所述第一方向的第一列网点和第二列网点之间。
在一些实施例中，所述多个齿形凹部在反射板上的投影覆盖第一列网点和第二列网点在反射板上的投影。
根据本公开的另一个方面，提供一种导光板，其中，所述导光板的出光表 面上形成有多个齿形凹部，所述多个齿形凹部形成在所述导光板的远离光源的一端。
在一些实施例中，所述多个齿形凹部沿平行于导光板的出光表面且自导光板的远离光源的一端朝向邻近光源的一端延伸的第一方向依次分布，且每个齿形凹部沿垂直于导光板的出光表面的第二方向延伸。
在一些实施例中，所述多个所述齿形凹部的形状相似，相邻的齿形凹部限定出类棱柱形结构，所述类棱柱形结构具有两个棱面。
在一些实施例中，每个所述齿形凹部在所述第一方向和第二方向形成的平面上的投影为V形，且所述V形的顶角为锐角。
在一些实施例中，所述多个齿形凹部的最大深度沿所述第一方向逐渐减小。
在一些实施例中，每个所述齿形凹部均具有靠近所述光源的第一反射面和远离所述光源的第二反射面，各个齿形凹部的第一反射面相互平行且第二反射面也相互平行。
在一些实施例中，每个所述齿形凹部的所述第一反射面和所述第二反射面在所述第一方向和第二方向形成的平面上的投影相交并形成顶角，所述多个齿形凹部的顶角的顶点排列在顶角线上，所述顶角线平行于所述第二反射面的全反射临界线。
根据本公开的另一个方面，提供一种显示装置，包括上述背光源装置。
附图说明
本公开的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1是根据本公开实施例的背光源装置的结构示意图；
图2是图1中E处的局部放大图；
图3是根据本公开实施例的齿形凹部的示意图；
图4是根据本公开实施例的一个齿形凹部的示意图，其中示出多组光线在 该齿形凹部的第一反射面和第二反射面的路径；以及
图5是根据本公开实施例的多个齿形凹部的示意图，其中示出多组光线在多个齿形凹部的第一反射面和第二反射面的路径。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的单元或具有相同或类似功能的单元。下面通过参考附图描述的实施例是示例性的，仅用于解释本公开，而不能理解为对本公开的限制。
下面参考图1至图5描述根据本公开实施例的背光源装置100。
根据本公开第一方面的背光源装置100包括：光源1、导光板2和胶框3。
如图1所示，在本公开的实施例中，光源1用于向导光板2发射光线，光源1设置在导光板2的一端而且光源1与导光板2的侧面相对，从光源1发射出的光线可在导光板2中传递。其中，光源1可以为LED(发光二极管：Light Emitting Diode)、CCFL(冷阴极荧光灯管：Cold Cathode Fluorescent Lamp)等，可根据需求进行选定。
可选地，光源1可以设置在导光板2的侧部，也可以设置在导光板2的下方，本公开以光源1设置在导光板2的侧部(参照图1)为例进行描述。其中，可以理解的是，图1中的胶框3仅示出一部分，以便于对本公开进行描述。
进一步地，如图1和图2所示，胶框3至少设置在导光板2的远离光源1的一端。其中，导光板2的出光表面，即上表面上的远离光源1的一端设置有多个齿形凹部21。如图1所示，当光源1发射光线时，光线可通过导光板2传递，部分光线在导光板2的作用下从导光板2的上表面射出，部分光线照射在胶框3上，这些光线在胶框3的朝向光源1一侧的侧壁上发生反射(反射为漫反射)，而且反射后的光线可再次传递至导光板2处。其中，这些再次传递至导光板2的光线中的一部分光线的路径将经过齿形凹部21，这部分光线在齿 形凹部21可以发生全反射或折射(参照图5)，这部分光线中的部分光线经过在导光板2内的多次折射或反射可以从导光板2的上表面射出，这部分光线中的另一部分光线的传播方向可以被改变并沿朝导光板2的底面方向射出，从而可以有效地防止光线从导光板2与胶框3之间的间隙透出，进而可以更好地防止背光源装置100的边缘漏光和发亮问题。
具体地，经过胶框3漫反射的光线可以射向齿形凹部21，当光线在齿形凹部21发生折射后可以从导光板2的上表面射出，也可以射入与该齿形凹部21相邻的另一个齿形凹部21。可以理解的是，光线的传播路径与光线射入齿形凹部21的角度相关，光线的不同入射角度对应不同的传播路径。
更进一步地，参照图5，光线射向齿形凹部21时，齿形凹部21改变光线的传播方向，使得光线向导光板2的上表面或下表面传播，从而可以减少从光源1射出并传播至胶框3的光线，进而更好地防止背光源装置100的边缘漏光和发亮问题。
根据本公开实施例的背光源装置100，通过在导光板2靠近胶框3的一侧设置多个齿形凹部21，可以将被胶框3的侧壁反射的光线进行折射或者反射，使得光线从导光板2的上表面射出或射向导光板2的下表面，从而可以有效地减少光线从导光板2和胶框3之间的间隙漏出，更好地防止背光源装置100的边缘漏光和发亮问题。
如图1所示，在本公开的实施例中，平行于导光板2的上表面(或下表面)且自导光板2的远离光源1的一端朝向邻近光源1的一端延伸的方向为第一方向，多个齿形凹部21沿第一方向依次分布且每个齿形凹部21沿第二方向——所述第二方向垂直于导光板的上表面——延伸，从而可将多个齿形凹部21布置成锯齿状，也便于多个齿形凹部21之间的协作，进而更好地对光线的传播方向进行干预。
可以理解的是，多个齿形凹部21采用这样的排布方式可以对光线的传播方向进行更好的干预。当光线射向其中一个齿形凹部21后，光线在齿形凹部 21的表面被反射或折射，然后可以被射向另一个齿形凹部21，多个齿形凹部21的布置对光线具有更全面的干预，且齿形凹部21的结构简单，从而可以更好地防止光线从背光源装置100的边缘处漏出等问题。
如图1所示，在本公开的实施例中，每个齿形凹部21为V形，相邻的齿形凹部21限定出类棱柱形结构213，类棱柱形结构213具有两个棱面。其中，光线可以在类棱柱形的两个棱面上进行反射或折射。需要说明的是，图1中的齿形凹部21在第一方向和第二方向共同形成的平面上的投影为类棱柱形的底面。齿形凹部21的结构简单，而且便于棱面对光线进行反射或折射，从而使得齿形凹部21对光线具有更好的导向作用。
其中，导光板2可采用亚克力(特殊处理的有机玻璃)或PC板(聚碳酸酯中空板)等制作，而且导光板2的形状可根据设计需要的尺寸进行加工，齿形凹部21的结构简单，便于导光板2的生产制造。
如图2所示，在本公开的实施例中，每个齿形凹部21均具有靠近光源1的第一反射面211和远离光源1的第二反射面212，各个齿形凹部21的第一反射面211相互平行，而且各个齿形凹部21的第二反射面212也相互平行。光线可以在第一反射面211和第二反射面212上进行折射或者反射，从而在多个齿形凹部21的第一反射面211和第二反射面212的共同作用下对光线的传播方向进行干预。
如图4所示，在本公开的一个具体的实施例中，光线a、光线b射向一个齿形凹部21的第一反射面211，而且光线a和光线b在第一反射面211处被折射，并从第一反射面211射出。其中，光线a,向朝向导光板2的上表面传播射出，光线b被折射后射向第二反射面212，而且光线b在被折射后在第二反射面212被反射，被反射的光线b,向朝向导光板2的上表面方向射出。当光线射向齿形凹部21时，在第一反射面211和第二反射面212的作用下，可将光线从朝向导光板2的上表面的方向射出，从而对光线的传播方向进行干预，进而更好地防止光线从背光源装置100的边缘处漏出等问题的发生。
如图5所示，在本公开又一个具体的实施例中，光线c、光线d、光线e射向一个齿形凹部21的第二反射面212，光线c、光线d、光线e在齿形凹部21的第二反射面212被反射，并且光线c、光线d、光线e在被反射后射向另一个齿形凹部21的第一反射面211，然后均在第一反射面211被折射，光线e最后被第一反射面211折射后沿e,方向射出；光线d在被第一反射面211折射后射向第二反射面212，又被第二反射面212反射后沿d,方向射出；光线c在被第一反射面211折射后射向第二反射面212，又被第二反射面212折射，沿着c,方向射向导光板2的底面。
可选地，如图2所示，多个齿形凹部21的形状相似，即多个齿形凹部21的形状可等比例放大或缩小，而且光线可以从一个齿形凹部21射向另一个齿形凹部21，多个齿形凹部21形状相似的设置也便于多个齿形凹部21之间的协作，从而多个齿形凹部21可以更好地对光线的传播方向进行干预。
如图3和图5所示，在本公开的一些实施例中，每个齿形凹部21的第一反射面211和第二反射面212在第一方向和第二方向形成的平面上的投影相交形成顶角，多个顶角的顶点排列在一条直线，即顶角线m(即图5中多个顶角线的连成的虚线)上。在第一方向和第二方向形成的所述平面上，顶角线m平行于第二反射面212的全反射临界线n(如图5所示)。可以理解的是，全反射临界线n与第二反射面212的法线的夹角为全反射临界角，当入射光在第二反射面212上的入射角大于或等于全反射临界角时，则入射光线被全反射，当入射光在第二反射面212上的入射角小于全反射临界角时，则一部分入射光线被反射，一部分入射光线被折射。
由此，可确保光线在相邻的齿形凹部21之间传递时，经邻近光源1的齿形凹部21的第二反射面212全反射后，光线能够全部进入与该齿形凹部21相邻且远离光源1的齿形凹部的第一反射面211，避免光线直接射向导光板2的底部，有效地防止漏光。
如图1和图2所示，在本公开的一个具体的实施例中，多个齿形凹部21 的底端相连且位于同一平面，且该同一平面与导光板2的除齿形凹部21之外的部分的上表面共面，从而使得多个齿形凹部21可以更好地对光线的传播方向进行干预，而且使得导光板2的结构简单，易于生产制造。
如图3所示，进一步地，全反射临界线n与第二反射面212形成的夹角区域为全反射区域A。当入射光线射向第二反射面212的方向与第二反射面212的夹角在全反射区域A这个范围内时，光线被第二反射面212全反射，即射向对应的全反射区域A。
如图3所示，更进一步地，齿形凹部21还包括折射区域B、折射区域C、折射区域D。当入射光线射入第二反射面212的角度在折射区域B时，光线从对应的折射区域B射出；当入射光线射入第二反射面212的角度在折射区域C时，光线从对应的折射区域C射出；当入射光线射入第二反射面212的角度在折射区域D时，光线从对应的折射区域D射出。其中，入射光线与第二反射面212之间的夹角在折射区域B、折射区域C、折射区域D范围内时，光线被折射。
需要说明的是，光线的传播具有可逆性，即当光线从全反射区域A,射向第二反射面212时，光线从全反射区域A射出；当光线从折射区域B,射向第二反射面212时，光线从全反射区域B射出；当光线从折射区域C,射向第二反射面212时，光线从全反射区域C射出；当光线从折射区域D射向第二反射面212时，光线从全反射区域D射出。
在本公开的一些实施例中，全反射临界线n以光源波谱中的波峰光波为第一参考基准，从而可以对光线的反射或者折射角度范围进行调节，进而齿形凹部21可以更好地对光线的传播方向进行干预。
在本公开的一些实施例中，全反射临界线n以光源波谱中的黄光为第二参考基准，从而可以更好地对光线的反射或者折射角度范围进行调节，进而齿形凹部21可以更好地对光线的传播方向进行干预。
具体地，第二参考基准可以是与黄光波长的差值在某一设定范围内的光， 即为黄光附近的光，本领域技术人员根据需要设置该设定范围。
如图2所示，在本公开的一些可选的实施例中，第一反射面211垂直于导光板2的除齿形凹部21外的部分的上表面，从而使得光线在第一反射面211上的反射或折射效果更加简单，便于对齿形凹部21对光线的导向方向计算，此外，由于结构简单，也便于导光板2的生产。
如图2所示，在本公开进一步的实施例中，第二反射面212与第一反射面211的夹角为锐角，从而使得齿形凹部21的结构更加简单，而且锐角的设置便于光线在齿形凹部21处更好地传播，可以对光线更加精确的导向。
如图1和图2所示，所述多个齿形凹部21的最大深度沿第一方向逐渐减小，齿形凹部21的最大深度可以理解为齿形凹部21的距离导光板2的除齿形凹部21外的部分的上表面的最大垂直距离。多个齿形凹部21最大深度逐渐减小的布置可以使得从远离光源1一侧射向齿形凹部21的光线逐渐被齿形凹部21导向，射向导光板2的下表面或沿导光板2的上表面方向射出，而当光线从靠近光源1一侧射向齿形凹部21时，通过齿形凹部21对光线的导向作用使得光线朝向导光板2的上表面射出(参照图4)。
如图1所示，在本公开的实施例中，导光板2的下方设有与导光板2平行设置的反射板4，导光板2的网点22呈列设置，而且相邻两列网点22之间的间距沿第一方向呈递减趋势，齿形凹部21在反射板4上的投影位于沿第一方向的第一列网点22和第二列网点22之间。多个齿形凹部21在反射板4上的投影可覆盖第一列网点22和第二列网点22在反射板4上的投影，从而使得导光板2更好地对光线进行传播。
具体地，当光线射向所述多个网点时，反射光会朝向各个角度传播，然后破坏反射条件从导光板2的上表面射出。通过设置各种疏密、大小不一的网点，可以使得导光板2均匀发光，而且反射板4可将射向反射板4的光线反射至导光板2中，进而可提高光的实用效率，同等发光亮度的情况下，发光效率更高，功耗低。
根据本公开第二方面实施例的导光板2，导光板2的出光表面(即附图中导光板2的上表面)上形成有齿形凹部21，齿形凹部21在导光板2的第一方向上远离光源的一端设置，多个齿形凹部21沿第一方向依次分布且每个齿形凹部21沿垂直导光板2的上表面的第二方向延伸，多个齿形凹部21的形状相似，每个齿形凹部21为类棱柱形。当光线射向齿形凹部21时，齿形凹部21可以对光线进行导向，进而便于将光线导向至沿导光板2的上表面射出或射向导光板2的下表面，使得导光板2发光更加均匀，提升导光板2的导光效果。
如图1和图2所示，在本公开进一步的实施例中，多个齿形凹部21的最大深度沿所述第一方向依次递减，进而齿形凹部21可以对射向齿形凹部21的光线进行多次反射或折射，从而更好地对光线进行导向。
根据本公开第三方面实施例的显示装置，包括上述的背光源装置100。其中，显示装置100可以是显示面板，也可以是包括显示面板的显示终端，也可以是显示面板的一部分。通过设置背光源装置100，从而可以提升显示装置的显示效果，进而提升用户的使用体验。
在本公开的描述中，需要理解的是，术语“上”、“下”、“顶”、“底”“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的结构或单元必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。此外，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征，并不代表相互之间具有先后或重要次要的关系。在本公开的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示意性实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或 多个实施例或示例中以合适的方式结合。
尽管已经示出和描述了本公开的实施例，本领域的普通技术人员可以理解：在不脱离本公开的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本公开的范围由权利要求及其等同物限定。

Claims (20)

  1. 一种背光源装置，包括：导光板、光源和胶框，
    所述光源设置在所述导光板的一端且与所述导光板的侧面相对；所述胶框至少设置在所述导光板的远离所述光源的一端，其中，所述导光板的出光表面上远离所述光源的一端设置有多个齿形凹部。
  2. 根据权利要求1所述的背光源装置，其特征在于，所述多个齿形凹部沿与所述导光板的出光表面平行且从所述导光板的远离所述光源的一端朝向邻近所述光源的一端的第一方向依次分布，且每个齿形凹部沿垂直于所述导光板的出光表面的第二方向延伸。
  3. 根据权利要求1所述的背光源装置，其特征在于，每个所述齿形凹部在所述第一方向和第二方向形成的平面上的投影为V形，相邻的齿形凹部限定出类棱柱形结构，所述类棱柱形结构具有两个棱面。
  4. 根据权利要求3所述的背光源装置，其特征在于，每个齿形凹部均具有靠近所述光源的第一反射面和远离所述光源的第二反射面，各个齿形凹部的第一反射面相互平行且第二反射面也相互平行。
  5. 根据权利要求4所述的背光源装置，其特征在于，每个所述齿形凹部的所述第一反射面和所述第二反射面在所述第一方向和第二方向形成的平面上的投影相交并形成顶角，所述多个齿形凹部的顶角的顶点排列在顶角线上，所述顶角线平行于所述第二反射面的全反射临界线。
  6. 根据权利要求5所述的背光源装置，其特征在于，所述全反射临界线以所述光源波谱中的波峰光波为第一参考基准。
  7. 根据权利要求5所述的背光源装置，其特征在于，所述全反射临界线以所述光源波谱中的黄光为第二参考基准。
  8. 根据权利要求4所述的背光源装置，其特征在于，所述第一反射面垂直于所述导光板的除齿形凹部外的部分的出光表面，所述第二反射面相对于所述第一反射面倾斜设置。
  9. 根据权利要求4所述的背光源装置，其特征在于，所述第一反射面与所述第二反射面之间的夹角为锐角。
  10. 根据权利要求2-9中任一项所述的背光源装置，其特征在于，所述齿形凹部的最大深度沿所述第一方向逐渐减小。
  11. 根据权利要求2-10中任一项所述的背光源装置，其特征在于，所述导光板的背离出光表面的一侧设有与所述导光板平行的反射板，所述导光板的网点呈列设置，且相邻两列导光板之间的间距沿所述第一方向逐渐减小，所述多个齿形凹部在所述反射板上的投影位于沿所述第一方向的第一列网点和第二列网点之间。
  12. 根据权利要求11所述的背光源装置，其特征在于，所述多个齿形凹部在反射板上的投影覆盖第一列网点和第二列网点在反射板上的投影。
  13. 一种导光板，其中，所述导光板的出光表面上形成有多个齿形凹部，所述多个齿形凹部形成在所述导光板的远离光源的一端。
  14. 根据权利要求13所述的导光板，其特征在于，所述多个齿形凹部沿 平行于导光板的出光表面且自导光板的远离光源的一端朝向邻近光源的一端延伸的第一方向依次分布，且每个齿形凹部沿垂直于导光板的出光表面的第二方向延伸。
  15. 根据权利要求13或14所述的导光板，其特征在于，所述多个所述齿形凹部的形状相似，相邻的齿形凹部限定出类棱柱形结构，所述类棱柱形结构具有两个棱面。
  16. 根据权利要求13至15中任一项所述的导光板，其特征在于，每个所述齿形凹部在所述第一方向和第二方向形成的平面上的投影为V形，且所述V形的顶角为锐角。
  17. 根据权利要求13至16中任一项所述的导光板，其特征在于，所述多个齿形凹部的最大深度沿所述第一方向逐渐减小。
  18. 根据权利要求13至17中任一项所述的导光板，其特征在于，每个所述齿形凹部均具有靠近所述光源的第一反射面和远离所述光源的第二反射面，各个齿形凹部的第一反射面相互平行且第二反射面也相互平行。
  19. 根据权利要求18所述的导光板，其特征在于，每个所述齿形凹部的所述第一反射面和所述第二反射面在所述第一方向和第二方向形成的平面上的投影相交并形成顶角，所述多个齿形凹部的顶角的顶点排列在顶角线上，所述顶角线平行于所述第二反射面的全反射临界线。
  20. 一种显示装置，包括根据权利要求1-12中任一项所述的背光源装置。
PCT/CN2019/079463 2018-04-12 2019-03-25 背光源装置、导光板以及显示装置 WO2019196635A1 (zh)

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