WO2016197407A1 - 背光模组及其导光板 - Google Patents

背光模组及其导光板 Download PDF

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Publication number
WO2016197407A1
WO2016197407A1 PCT/CN2015/082187 CN2015082187W WO2016197407A1 WO 2016197407 A1 WO2016197407 A1 WO 2016197407A1 CN 2015082187 W CN2015082187 W CN 2015082187W WO 2016197407 A1 WO2016197407 A1 WO 2016197407A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light
light guide
convex portion
plate according
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/CN2015/082187
Other languages
English (en)
French (fr)
Inventor
周革革
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.)
Wuhan China Star Optoelectronics Technology Co Ltd
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Wuhan China Star 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 Shenzhen China Star Optoelectronics Technology Co Ltd, Wuhan China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US14/778,254 priority Critical patent/US20170168220A1/en
Publication of WO2016197407A1 publication Critical patent/WO2016197407A1/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
    • G02B6/0035—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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—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
    • G02B6/005—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
    • G02B6/0093—Means for protecting the light guide
    • 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
    • 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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide

Definitions

  • the invention relates to a liquid crystal display technology, in particular to a backlight module and a light guide plate thereof.
  • a liquid crystal display device includes a backlight module and a liquid crystal panel.
  • the LCD screen is overlaid on the backlight module.
  • the backlight module is equivalent to a light source of a liquid crystal panel.
  • the LCD screen modulates the light emitted by the backlight module to display graphics and colors on the LCD screen.
  • FIG. 1 shows a conventional side-lit backlight module 1.
  • the backlight module 1 includes a light guide plate 2, a light bar 3, and a reflection sheet 4.
  • the left side of the light guide plate 2 is the light incident surface 5, and the upper surface of the light guide plate 2 is the light exit surface 7.
  • the light bar 3 is disposed on the light incident surface 5 side of the light guide plate 2.
  • a light emitting diode 6 is disposed on the light bar 3.
  • the reflection sheet 4 is disposed on a side of the light guide plate 2 facing away from the light-emitting surface 7 and covers the light guide plate 2.
  • the reflection sheet 4 includes a reflection surface facing the light guide plate 2. Light emitted from the light-emitting diode 6 enters the light guide plate 2 from the light incident surface 5.
  • the reflective sheet 4 further includes a protective layer disposed above the reflective surface.
  • the optical properties of the material of the protective layer are close to those of the material of the light guide plate 2, for example, the speed at which light propagates in both is close.
  • the portion is darker than the other portions, and the light-emitting surface 7 is uneven. Thereby, the optical taste of the backlight module 1 deteriorates.
  • the present invention provides a light guide plate, which includes a light guide plate, which is capable of causing adsorption between a light guide plate and a reflective sheet to cause unevenness of the light-emitting surface of the light guide plate, and includes:
  • a plate-shaped body one surface of the body is a light-emitting surface
  • the boss is provided with two protrusions, which are respectively located at opposite ends of the body.
  • the heights of the two raised portions are equal.
  • the raised portion is strip-shaped and the raised portion extends in a direction parallel to the side of the body to which it is adjacent.
  • the body includes a side for entering light
  • the light guide plate is provided with two convex portions, one of which is close to the side and the other is turned to the side.
  • Both of the raised portions are provided with a sloped surface facing the other raised portion, and the two inclined surfaces are joined to form an inwardly concave curved surface.
  • the arcuate surface is translated by an arc or elliptical arc extending in a direction parallel to the line of the side and the exit face.
  • the top end of the raised portion is a sharp edge.
  • the body includes a side for entering light, and the raised portion is configured as a prism extending in a direction parallel to the side, the raised portion having a tapered width in a direction away from the light exiting surface.
  • the raised portion has a triangular cross section.
  • the triangle is an isosceles right triangle and the base of the isosceles right triangle is parallel to the light exit surface.
  • the raised portion is a right prism.
  • the present invention also proposes a liquid crystal display device comprising the above-described light guide plate.
  • the protrusion separates the body of the light guide plate from the reflection sheet, and forms an air layer between the light guide plate and the reflection sheet, and the body of the light guide plate is difficult to be adsorbed with the reflection sheet.
  • the reflectivity of the interface is uniform, and the critical angle of total reflection at the interface is sufficiently small. Thereby, the light distribution of the light guide plate from the light exit surface is more uniform.
  • FIG. 1 is a schematic cross-sectional view showing a conventional backlight module
  • FIG. 2 is a schematic cross-sectional view showing a backlight module in Embodiment 1 of the present invention
  • FIG. 3 is a schematic cross-sectional view showing a backlight module in Embodiment 2 of the present invention.
  • FIG. 4 is a schematic view showing the backlight module of FIG. 3 in an operating state
  • FIG. 5 is a schematic cross-sectional view showing a backlight module in Embodiment 3 of the present invention.
  • FIG. 2 schematically shows the structure of a backlight module 10 in Embodiment 1.
  • the backlight module 10 includes a light guide plate 11 , a light bar 17 and a reflection sheet 16 .
  • the light guide plate 11 includes a body 27 and a boss portion 14.
  • the body 27 is a substantially rectangular plate-like structure.
  • One plate surface of the body 27 is a light exit surface 12.
  • the surface of the body 27 opposite to the light-emitting surface 12 is a back surface.
  • the boss portion 14 is provided on the side of the body 27 of the light guide plate 11 facing away from the light exit surface 12 (i.e., the back side of the body 27).
  • the boss portion 14 projects from the body 27 in a direction away from the light exit surface 12.
  • One of the outer sides of the body 27 is the light incident surface 13.
  • the light guide plate 11 is usually made of a transparent material.
  • the refractive index of the transparent material is generally higher than the refractive index of air.
  • the transparent material can be a transparent plastic.
  • the transparent material is preferably an optical grade polycarbonate or polymethyl methacrylate.
  • the reflection sheet 16 has a rectangular sheet structure.
  • the reflection sheet 16 is flat.
  • the reflection sheet 16 is provided with a reflection surface.
  • the reflection sheet 16 is provided on the back side of the light guide plate 11.
  • the reflecting surface of the reflection sheet 16 faces the light guide plate 11.
  • the reflection sheet 16 abuts against the top end of the convex portion 14 of the light guide plate 11.
  • the convex portion 14 separates the body 27 of the light guide plate 11 from the reflection sheet 16 and forms an air layer 15 between the body 27 and the reflection sheet 16, and the body of the light guide plate 11 is difficult to be adhered to the reflection sheet 16. together.
  • the light bar 17 includes a substantially strip-shaped bottom plate 18 and a plurality of light-emitting elements 19 fixed to the bottom plate 18.
  • the bottom plate 18 may be a flexible printed circuit board (ie, a flexible printed circuit board).
  • the light emitting element 19 can be a light emitting diode. These light emitting elements 19 are spaced apart from one another.
  • the light-emitting elements 19 are evenly distributed on the same side of the bottom plate 18 along the direction in which the bottom plate 18 extends, and are perpendicular to the bottom plate 18.
  • the light-emitting portion of the light-emitting element 19 is located on the side of the light-emitting element 19. These illuminating portions are oriented in the same direction, and the direction is perpendicular to the extending direction of the bottom plate 18.
  • the light bar 17 is fixed on the light guide plate 11 and faces the light incident surface 13 of the light guide plate 11.
  • the plate surface on which the light-emitting element 19 is provided on the bottom plate 18 is adhered to the light-emitting surface 12 of the light guide plate 11 by using the double-sided tape 22, and the light-emitting portion of the light-emitting element 19 is directed toward the light-incident surface 13 of the light guide plate.
  • the light emitted by the light-emitting element 19 can enter the light guide plate 11 through the light-incident surface 13, and a part of the light is reflected from the light-emitting surface 12 after being reflected one or more times.
  • the gap between the body 27 of the light guide plate 11 and the reflection sheet 16 forms an air layer 15, the reflectance of the interface between the light guide plate 11 and the air layer 15 is uniform, and the critical angle of total reflection at the interface is sufficiently small.
  • the body 27 of the light guide plate 11 and the reflection sheet 16 are not easily attracted to each other. Thereby, the light distribution of the light-emitting surface 12 from the light guide plate 11 is more uniform.
  • other surfaces of the light guide plate 11, such as the respective side faces and the light exit face 12, are very smooth except for the back side.
  • a light is reflected by one or more reflections inside the light guide plate 11 to a reflection dot disposed on the back surface of the light guide plate 11.
  • Each reflective dot can scatter light that strikes its surface.
  • a portion of the scattered light is directed toward the light exit surface 12, and its incident angle on the light exit surface 12 is less than the critical angle. Thereby, the partially scattered light is emitted from the light exit surface 12 to the light guide plate 11.
  • one side of the body of the light guide plate 11 facing away from the light-emitting surface 12 is provided with two convex portions 14 respectively adjacent to opposite sides of the light guide plate 11.
  • the two convex portions 14 respectively disposed adjacent to opposite sides of the light guide plate 11 separate the opposite ends of the light guide plate 11 from the reflection sheet.
  • the body of the light guide plate 11 is completely separated from the reflection sheet 16, and the two are less likely to be adsorbed together.
  • the heights of the two raised portions 14 are uniform.
  • the light-emitting surface 12 of the light guide plate 11 is parallel to the reflection surface of the reflection sheet 16, and the light distribution from the light-emitting surface 12 of the light guide plate 11 is more uniform.
  • the light emitted from the light-emitting surface 12 of the light guide plate 11 is perpendicular to the light-emitting surface 12, and the brightness of the front end of the light-emitting surface 12 of the light guide plate 11 is larger, so that the liquid crystal display device to which the light guide plate 11 is mounted is positive.
  • the display in front is better.
  • the raised portion 14 is strip-shaped, and the convex portion 14 extends in a direction parallel to the side surface to which it is adjacent.
  • the two strip-shaped convex portions 14 support the light guide plate 11 from both ends of the light guide plate 11 to achieve the guide
  • the fit between the light plate 11 and the reflective sheet 16 is sufficiently smooth while increasing the interface area between the back surface of the body 27 and the air layer 15.
  • the convex portion 14 has a rectangular frame structure.
  • the outer sides of the four frame strips of the raised portion 14 are flush with the four sides of the light guide plate 11, respectively.
  • the boss portion 14 abuts against the edge of the reflection sheet 16 and holds the reflection sheet 16 so that the reflection sheet 16 can be prevented from being curled.
  • the backlight module 10 further includes an optical film set 23.
  • the optical film set 23 has a rectangular shape.
  • the optical film group 23 is covered on the light exit surface 12.
  • one side of the optical film group 23 abuts against the side surface of the bottom plate 18 of the light bar 17, and the other three sides of the optical film group 23 are respectively opposite to the three sides of the light guide plate 11 (excluding the light incident surface 13) Corresponding alignment.
  • the optical film group 23 includes a diffusion sheet 24, a lower prism sheet 25, and an upper prism sheet 26 which are sequentially laminated. The diffusion sheet can be bonded to the light exit surface 12.
  • the backlight module 10 further includes a plastic frame 20 and a back plate 21.
  • the back plate 21 has a substantially box shape.
  • the light guide plate 11, the reflection sheet 16, and the light bar 17 are all disposed in the back plate 21, wherein the surface of the reflection sheet 16 facing the light guide plate 11 is attached to the bottom surface of the back plate 21.
  • the plastic frame 20 has a rectangular frame structure.
  • the frame 20 is typically made of a PC material (i.e., polycarbonate).
  • the plastic frame 20 surrounds the light guide plate 11, the light bar 17 and the optical film group 23, and the outer peripheral wall abuts against the back plate 21.
  • the light guide plate 11, the light bar 17, the plastic frame 20, the reflection sheet 16, the optical film group 23, and the back plate 21 are relatively fixed.
  • the back plate 21 serves as a casing of the backlight module 10 to protect components disposed therein.
  • the back plate 21 is usually made of a rigid material, and the back plate 21 serves as a skeleton of the backlight module 10 to support the backlight module 10.
  • the plastic frame 20 also functions as a buffer to protect the light guide plate 11, the light bar 17, and the optical film group when the backlight module 10 is subjected to an impact.
  • the backlight module 30 in the second embodiment differs from the backlight module 10 in the first embodiment only in the structure of the light guide plate.
  • the light guide plate 31 of the backlight module 30 in Embodiment 2 will be mainly described below.
  • the backlight module 30 includes a light guide plate 31.
  • the light guide plate 31 includes a body 37 and two bosses 35.
  • the body 37 is a substantially rectangular plate-like structure.
  • One plate surface of the body 37 is a light exit surface 32.
  • the surface of the body 37 opposite to the light exit surface 32 is the back surface.
  • the two raised portions 35 are disposed on the side of the body of the light guide plate 31 facing away from the light exit surface 32 (ie, the back side of the body 37).
  • the boss portion 35 projects from the body 37 in a direction away from the light exit surface 32.
  • One of the sides of the body 37 is used to enter the light. This side is the side of the body 37 facing the light-emitting element 19.
  • One of the two raised portions 35 is adjacent to the side, the convex
  • the side surface of the rising portion is connected to the side surface as the light incident surface 34 of the light guide plate.
  • the other of the two raised portions 35 faces away from the side surface.
  • Each of the two raised portions 35 is provided with a slope 38 facing the other raised portion 35. Both of the slopes 38 are sloped.
  • the two sides are connected to each other to form a smooth curved surface 33. This curved surface 33 is recessed toward the inside of the light guide plate 31.
  • the light guide plate 31 is usually made of a transparent material.
  • the refractive index of the transparent material is generally higher than the refractive index of air.
  • the transparent material can be a transparent plastic.
  • the transparent material is preferably an optical grade polycarbonate or polymethyl methacrylate.
  • An air layer 36 separating the light guide plate 31 from the reflection sheet 16 is formed between the two convex portions 35.
  • the reflectance of the interface between the light guide plate 31 and the air layer 36 is uniform, and the critical angle of total reflection at the interface is sufficiently small. Thereby, the light emitted from the light guide plate 31 is more uniform.
  • the interface between the air layer 36 and the reflective sheet 16 is a curved surface 33 recessed in the light guide plate 31. As shown in FIG. 4, light is incident from the light incident surface 34 onto the curved surface 33. Since the curved surface 33 is recessed and smoothed inward, the conduction path of the light in the light guide plate 31 is better.
  • the light exit surface 32 emits light more uniformly.
  • the arc surface 33 and the light incident surface 34 are at an angle, more light perpendicular to the light incident surface 34 is reflected upward by the curved surface 33, or is refracted toward the reflective sheet 16 through the curved surface 33.
  • the light reflected by the reflection sheet 16 is directed upward, and this portion of the light is refracted or reflected and is more easily emitted from the light exit surface 32 of the light guide plate 31 instead of being consumed in the light guide plate 31. This further improves the utilization of this part of the light and improves the brightness of the light-emitting surface.
  • the arc surface 33 is translated by an arc or an elliptical arc in a direction in which a straight line parallel to the light incident surface 34 and the light exit surface 32 extends.
  • the light reflected by the curved surface 33 is more evenly distributed in parallel with the direction of the line when it exits the light exit surface 32.
  • the tips of the two raised portions 35 are sharp edges.
  • the contact between the tip end of the boss portion 35 and the reflection sheet 16 is in line contact, the contact area between the light guide plate 31 and the reflection sheet 16 is reduced, and the light guide plate 31 is less leaking light.
  • other surfaces of the light guide plate 31, such as the respective outer side surfaces and the light exit surface 32, are very smooth except for the arcuate surface 33.
  • the backlight module 40 in the third embodiment differs from the backlight module 10 in the first embodiment only in the structure of the light guide plate.
  • the light guide plate 41 of the backlight module 40 in Embodiment 3 will be mainly described below.
  • the backlight module 40 includes a light guide plate 41.
  • the light guide plate 41 includes a body 47 and a plurality of bosses 44.
  • the body 47 has a substantially plate-like structure.
  • One plate surface of the body 47 is a light exit surface 42.
  • a plurality of raised portions 44 are disposed on a side of the body 47 facing away from the light exit surface 42.
  • the boss portion 44 projects from the body 47 in a direction away from the light exit surface 42.
  • the boss 44 is configured in a prismatic structure.
  • the plurality of bosses 44 are parallel to each other.
  • One side of the body 47 is used for light entering, and the side is the light incident surface 43.
  • the raised portion 44 has an extending direction parallel to the light incident surface 43 and parallel to the light exit surface 42.
  • the convex portion 44 has a triangular prism in cross section.
  • One sharp edge of the raised portion 44 faces in a direction away from the light exit surface 42, and the cross section has a tapered width in a direction away from the light exit surface 42.
  • a plurality of air layers 45 are formed between the light guide plate 41 and the boss portion 44.
  • the light guide plate 41 is usually made of a transparent material.
  • the refractive index of the transparent material is generally higher than the refractive index of air.
  • the transparent material can be a transparent plastic.
  • the transparent material is preferably an optical grade polycarbonate or polymethyl methacrylate.
  • the light guide plate 41 has a substantially rectangular plate-like structure.
  • One plate surface of the light guide plate 41 is a light exit surface 42.
  • the surface of the light guide plate 41 facing the light exit surface 42 is a back surface.
  • One of the outer sides of the body 47 is a light incident surface 43.
  • An air layer 45 separating the light guide plate 41 from the reflection sheet 16 is formed between the two adjacent convex portions 44.
  • the reflectance of the interface between the light guide plate 41 and the air layer 45 is uniform, and the critical angle of total reflection at the interface is sufficiently small. Thereby, the light emitted from the light guide plate 41 is more uniform.
  • the interface between the air layer 45 and the light guide plate includes both side faces 46 of the raised portion 44. Part of the light is incident on the two angled side faces 46, which are reflected by the two side faces 46 in turn, and are emitted toward the light exiting face 42. Thus, the light does not have to pass through the air layer 45 to the reflection sheet 16 and is reflected by the reflection sheet 16 toward the light exit surface 42.
  • Eliminating the absorption of this portion of the light by the defects in the air layer 45 or the reflection sheet 16 and the escape of the portion of the light in the reflection sheet 16 improves the utilization of the light. Thereby, the brightness of the light exit surface 42 is higher. Further, the tip end of the boss portion 44 and the reflection sheet 16 are in line contact, the contact area between the light guide plate 41 and the reflection sheet 16 is reduced, and the light guide plate 41 is light-leaked.
  • the convex portion 44 has a cross section of an isosceles right triangle, and a bottom edge of the isosceles right triangle is parallel to the light exit surface 42.
  • the light rays that are reflected by the two side faces 46 of the boss portion 44 and are incident on the light exit surface 42 are sequentially the most, and the utilization of light is the highest.
  • the brightness of the front end of the light exit surface 42 is also the highest.
  • the raised portion 44 is a right prism. After the convex portion 44 is set as a right prism, the convex portion 44 is reversed The emitted light rays are more uniformly distributed in the extending direction parallel to the convex portion 44 when exiting the light exiting surface 42.
  • other surfaces of the light guide plate 41 are very smooth except for the back side.
  • On the back side of the light guide plate 41 there are a plurality of reflective dots which are etched/printed. A plurality of reflective dots are densely distributed on the back side. Reflective dots can scatter light that is incident on it.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

一种背光模组及其导光板（11）。导光板（11）包括：板状的本体（27），本体（27）的一个板面为出光面（12）；以及从本体（27）背向出光面（12）的一侧向背向出光面（12）方向凸出的凸起部（14）。凸起部（14）将导光板（11）的本体（27）与反射片（16）分隔开来，并使得导光板（11）的与反射片（16）之间形成空气层（15），导光板（11）的本体（27）难以与反射片（16）吸附在一起。

Description

背光模组及其导光板
相关申请的交叉引用
本申请要求享有于2015年6月10日提交的名称为“背光模组及其导光板”的中国专利申请CN 201510315506.6的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本发明涉及一种液晶显示技术，特别涉及背光模组及其导光板。
背景技术
目前，液晶显示装置包括背光模组和液晶屏。液晶屏覆盖在背光模组上。背光模组相当于液晶屏的光源。液晶屏通过对背光模组发出的光线进行调制以在液晶屏上显示出图形和色彩。随着液晶显示技术的发展，人们希望能尽可能提高背光模组的亮度，又希望背光模组的能耗尽可能小，同时还希望背光模组的光学品味尽可能好。
图1显示了一种现有的侧入光式的背光模组1。背光模组1包括导光板2、灯条3、反射片4。导光板2朝左的侧面为入光面5，导光板2朝上的板面为出光面7。灯条3设置在导光板2的入光面5一侧。灯条3上设置有发光二极管6。反射片4设置在导光板2背向出光面7的一侧，并覆盖在导光板2上。反射片4包括朝向导光板2的反射面。发光二极管6发出的光线从入光面5进入到导光板2。这些光线在导光板2内经过一次或多次反射后从导光板2的出光面7射出。从导光板2射入到反射面上的光线中的大部分会被反射回导光板2，然后从出光面7射出。这样就提高了光线的利用率。
反射片4与导光板2容易吸附在一起，即反射片4与导光板2紧贴在一起。通常，反射片4还包括设置在反射面上方的保护层。保护层的制作材料的光学性质与导光板2的制作材料的光学性质接近，例如，光在这两者中传播的速度接近。当一部分反射片4与导光板2紧贴在一起时，光从导光板2射入反射片4的临界角较大。导致在该处从导光板2射向反射片4中的光线会在保护层中发生大角度 泄漏。当人们从垂直于导光板2的出光面7的方向查看出光面7，会发现该处比其他部分更暗，出光面7明暗不均。由此，背光模组1的光学品味变差。
发明内容
针对导光板与反射片之间容易产生吸附而导致导光板的出光面明暗不均的技术问题，本发明提出了一种导光板，包括：
板状的本体，本体的一个板面为出光面；以及
从本体背向出光面的一侧向背向出光面方向凸出的凸起部。
在一个具体的实施例中，凸起部设置有两个，两个凸起部分别位于本体相对的两端。
在一个具体的实施例中，两个凸起部的高度相等。
在一个具体的实施例中，凸起部为条状，凸起部的延伸方向平行于其所靠近的本体的侧面。
在一个具体的实施例中，本体包括一个用于入光的侧面，
导光板设置有两个凸起部，其中一个凸起部靠近侧面，另一个凸起部背向侧面，
两个凸起部均设置有朝向另一个凸起部的斜面，两个斜面连接成向内凹陷的弧面。
在一个具体的实施例中，弧面由圆弧或椭圆弧沿平行于侧面和出光面的直线的延伸方向平移而成。
在一个具体的实施例中，凸起部的顶端为尖棱。
在一个具体的实施例中，本体包括一个用于入光的侧面，凸起部构造为延伸方向平行于侧面的棱柱，凸起部沿背向出光面方向具有渐缩的宽度。
在一个具体的实施例中，凸起部的横截面为三角形。
在一个具体的实施例中，三角形为等腰直角三角形，等腰直角三角形的底边平行于出光面。
在一个具体的实施例中，凸起部为直棱柱。
本发明还提出了一种液晶显示装置，包括上述的导光板。
凸起部将导光板的本体与反射片分隔开来，并使得导光板的与反射片之间形成空气层，导光板的本体难以与反射片吸附在一起。另外，导光板与空气层之间 的界面的反射率一致，并且在该界面上全反射的临界角足够小。由此，从出光面射出导光板的光线分布更均匀。
附图说明
在下文中将基于实施例并参考附图来对本发明进行更详细的描述。其中：
图1显示了一种现有的背光模组的全剖示意图；
图2显示了本发明的实施例1中的背光模组的全剖示意图；
图3显示了本发明的实施例2中的背光模组的全剖示意图；
图4显示了图3中的背光模组在工作状态中的示意图；
图5显示了本发明的实施例3中的背光模组的全剖示意图。
在附图中，相同的部件使用相同的附图标记。附图并未按照实际的比例绘制。
具体实施方式
下面将结合附图对本发明作进一步说明。
实施例1
图2示意性地显示了在实施例1中的一种背光模组10的结构。背光模组10包括导光板11、灯条17和反射片16。
导光板11包括本体27和凸起部14。本体27为大致矩形的板状结构。本体27的一个板面为出光面12。本体27中的与出光面12相对的面为背面。凸起部14设置在导光板11的本体27背向出光面12的一侧(即本体27的背面一侧)。凸起部14从本体27向背向出光面12的方向凸出。本体27的其中一个外侧面为入光面13。
导光板11通常由透明材料制成。该透明材料的折射率通常高于空气的折射率。该透明材料可以是透明塑料。该透明材料优选为光学级的聚碳酸酯或聚甲基丙烯酸甲酯。
反射片16为矩形薄片结构。反射片16平整。反射片16设置有反射面。反射片16设置在导光板11的背面一侧。反射片16的反射面朝向导光板11。反射片16抵接于导光板11的凸起部14的顶端。这样，凸起部14将导光板11的本体27与反射片16分隔开来，并使得本体27的与反射片16之间形成空气层15，导光板11的本体难以与反射片16吸附在一起。
灯条17包括大致条状的底板18，以及固定在底板18上的多个发光元件19。底板18可以是柔性电路板(即flexible printed circuit board)。发光元件19可以是发光二极管。这些发光元件19彼此间隔开。发光元件19沿底板18的延伸方向均匀地分布在底板18的同一侧，且垂直于底板18。发光元件19的发光处位于发光元件19的侧面。这些发光处朝向相同的方向，且该方向垂直于底板18的延伸方向。灯条17固定在导光板11上，发光处朝向导光板11的入光面13。例如可以是采用双面胶22将底板18设置有发光元件19的板面粘贴到导光板11的出光面12上，同时将发光元件19的发光处朝向导光板的入光面13。
这样，发光元件19发出的光线可以穿过该入光面13射入导光板11内，一部分光线经一次或多次反射后从出光面12射出。导光板11的本体27与反射片16之间的间隙形成空气层15，导光板11与空气层15之间的界面的反射率一致，并且在该界面上全反射的临界角足够小。同时，导光板11的本体27与反射片16之间不容易相互吸附。由此，出光面12射出导光板11的光线分布更均匀。
优选地，除背面外，导光板11的其它表面，例如各个侧面、出光面12均非常光滑。在导光板11的背面上具有蚀刻/印刷出的多个反射网点。多个反射网点密集地分布在背面上。反射网点可以将射入到其上的光线散射出去。
一部光线在导光板11内部经过一次或多次反射反射到设置在导光板11背面上的反射网点。每个反射网点可以将射到其表面上的光线散射出去。一部分所散射的光线射向出光面12，并且其在出光面12上的入射角小于临界角。由此，这部分散射光线从出光面12射出导光板11。
优选地，导光板11的本体背向出光面12的一侧设置有两个凸起部14，两个凸起部14分别靠近导光板11相对的两个侧面。这样，分别设置在靠近导光板11相对两个侧面的两个凸起部14将导光板11的相对两端与反射片分隔开。这样，导光板11的本体完全与反射片16分开，两者更不容易吸附在一起。更优选地，两个凸起部14的高度一致。这样，导光板11的出光面12与反射片16的反射面平行，从导光板11的出光面12射出的光线分布更均匀。尤其是，从导光板11的出光面12射出的垂直于出光面12的光线更多，导光板11的出光面12前端的亮度更大，从而安装有这种导光板11的液晶显示装置的正前方的显示效果更好。
更优选地，凸起部14为条状，凸起部14的延伸方向平行于其所靠近的侧面。这样，两个条状的凸起部14从导光板11的两端支撑导光板11，以实现在保持导 光板11与反射片16之间的配合足够平稳的同时增大本体27的背面与空气层15之间的界面面积。
在本实施例中，凸起部14为矩形框结构。凸起部14的四条边框条的外侧面分别与导光板11的四个侧面平齐。凸起部14抵住反射片16的边缘并将反射片16撑住，这样可以避免反射片16卷曲。
背光模组10还包括光学膜片组23。光学膜片组23呈矩形。光学膜片组23的覆盖在出光面12上。优选地，光学膜片组23的一个侧面抵接于灯条17的底板18的侧面，光学膜片组23的其他三个侧面分别与导光板11的三个侧面(不含入光面13)对应对齐。在一个例子中，光学膜片组23包括依次层叠的扩散片24、下棱镜片25和上棱镜片26。扩散片可与出光面12粘接。
背光模组10还包括胶框20和背板21。背板21呈大致的盒形。导光板11、反射片16和灯条17均设置在背板21内，其中，反射片16背向导光板11的板面贴合于背板21的底面。胶框20为矩形框结构。胶框20一般由PC材料(即聚碳酸酯)制成。胶框20环绕导光板11、灯条17和光学膜片组23，并外周壁抵接于背板21。这样，导光板11、灯条17、胶框20、反射片16、光学膜片组23和背板21相对固定住。背板21作为背光模组10的外壳保护设置在其内的部件。另外，背板21通常由刚性材料制成，背板21作为背光模组10的骨架支撑起背光模组10。胶框20还起到缓冲的作用，在背光模组10受到冲击时保护导光板11、灯条17和光学膜片组。
实施例2
实施例2中的背光模组30与实施例1中的背光模组10的区别仅在于导光板的结构不同。为简洁起见，下面仅重点描述实施例2中的背光模组30的导光板31。
如图3所示，背光模组30包括导光板31。导光板31包括本体37和两个凸起部35。本体37为大致矩形的板状结构。本体37的一个板面为出光面32。本体37中的与出光面32相对的面为背面。两个凸起部35均设置在导光板31的本体背向出光面32的一侧(即本体37的背面一侧)。凸起部35从本体37向背向出光面32的方向凸出。本体37的其中一个侧面用于入光。这个侧面即为本体37朝向发光元件19的侧面。两个凸起部35中的一个凸起部35靠近该侧面，该凸 起部朝外的侧面与上述侧面连接成导光板的入光面34。两个凸起部35中的另一个凸起部35背向上述侧面。
两个凸起部35中均设置有一个朝向另一个凸起部35的斜面38。这两个斜面38均呈斜坡状。这两个侧面相互连接起来形成平滑的弧面33。这个弧面33向导光板31的内部凹陷。
导光板31通常由透明材料制成。该透明材料的折射率通常高于空气的折射率。该透明材料可以是透明塑料。该透明材料优选为光学级的聚碳酸酯或聚甲基丙烯酸甲酯。
两个凸起部35之间形成了将导光板31与反射片16分隔开的空气层36。导光板31与空气层36之间的界面的反射率一致，并且在该界面上全反射的临界角足够小。由此，导光板31出射的光线更均匀。尤其是，空气层36与反射片16之间的界面为上述向导光板31内凹陷的弧面33。如图4所示，光线从入光面34射入到弧面33上，由于弧面33向内凹陷且平滑，光线在导光板31内的传导路径更好。这样，更多的光线可以被传导到导光板31背向入光面34的一端，出光面32发光更均匀。同时，由于弧面33与入光面34之间呈夹角，更多垂直于入光面34的光线被弧面33反射向朝上的方向，或者穿过弧面33折射向反射片16再被反射片16反射向朝上的方向，这部分光线被折射或反射后更容易从导光板31的出光面32射出而不是消耗的导光板31内。这样进一步提高了这部分光线的利用率，提高了出光面的亮度。
优选地，上述弧面33由圆弧或椭圆弧沿平行于入光面34和出光面32的直线的延伸方向平移而成。这样，弧面33反射的光线在射出出光面32时在平行于该直线方向上分布更均匀。
优选地，两个凸起部35的顶端均为尖棱。这样，凸起部35的顶端与反射片16之间为线接触，导光板31与反射片16之间的接触面积减小，导光板31漏光更小。
优选地，除弧面33外，导光板31的其它表面，例如各个外侧面、出光面32均非常光滑。在导光板31的弧面33上具有蚀刻/印刷出的多个反射网点。多个反射网点密集地分布在弧面33上。反射网点可以将射入到其上的光线散射出去。
实施例3
实施例3中的背光模组40与实施例1中的背光模组10的区别仅在于导光板的结构不同。为简洁起见，下面仅重点描述实施例3中的背光模组40的导光板41。
如图5所示，背光模组40包括导光板41。导光板41包括本体47和多个凸起部44。本体47呈大致的板状结构。本体47的一个板面为出光面42。多个凸起部44均设置在本体47背向出光面42的一侧。凸起部44从本体47向背向出光面42的方向凸出。凸起部44构造成棱柱结构。多个凸起部44相互平行。本体47的一个侧面用于入光，该侧面为入光面43。凸起部44为延伸方向平行于入光面43且平行于出光面42。凸起部44的横截面为三角形的棱柱。凸起部44的一个尖棱朝向背向出光面42的方向，横截面沿背向出光面42方向具有渐缩的宽度。这样，导光板41与凸起部44之间形成多个空气层45。
导光板41通常由透明材料制成。该透明材料的折射率通常高于空气的折射率。该透明材料可以是透明塑料。该透明材料优选为光学级的聚碳酸酯或聚甲基丙烯酸甲酯。导光板41为大致矩形的板状结构。导光板41的一个板面为出光面42。导光板41中的与出光面42相对的面为背面。本体47的其中一个外侧面为入光面43。
在两个相邻的凸起部44之间形成了将导光板41与反射片16分隔开的空气层45。导光板41与空气层45之间的界面的反射率一致，并且在该界面上全反射的临界角足够小。由此，导光板41出射的光线更均匀。尤其是，空气层45与导光板之间的界面包括凸起部44的两个侧面46。部分光线射入到这两个成夹角的侧面46上，依次经过这两个侧面46反射后，朝向出光面42射出。这样，这些光线不必再穿过空气层45射入到反射片16上再由反射片16反射向出光面42了。消除这部分光线被空气层45或反射片16中的缺陷吸收以及这部分光线在反射片16中逃逸的影响，提升了光线的利用率。由此，出光面42的亮度更高。另外，凸起部44的顶端与反射片16之间为线接触，导光板41与反射片16之间的接触面积减小，导光板41漏光更小。
优选地，凸起部44的横截面为等腰直角三角形，该等腰直角三角形的底边平行于出光面42。这样设置后，依次在凸起部44的两个侧面46进行反射而射向出光面42的光线最多，光线的利用率最高。同时，出光面42前端的亮度也最高。
优选地，凸起部44为直棱柱。将凸起部44设置成直棱柱后，凸起部44反 射的光线在射出出光面42时在平行于该凸起部44的延伸方向上分布更均匀。
优选地，除背面外，导光板41的其它表面，例如各个侧面、出光面42均非常光滑。在导光板41的背面上具有蚀刻/印刷出的多个反射网点。多个反射网点密集地分布在背面上。反射网点可以将射入到其上的光线散射出去。
虽然已经参考优选实施例对本发明进行了描述，但在不脱离本发明的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本发明并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (16)

  1. 一种导光板，包括：
    板状的本体，所述本体的一个板面为出光面；以及
    从所述本体背向所述出光面的一侧向背向所述出光面方向凸出的凸起部。
  2. 根据权利要求1所述的导光板，其中，所述凸起部设置有两个，两个所述凸起部分别位于所述本体相对的两端。
  3. 根据权利要求2所述的导光板，其中，两个所述凸起部的高度相等。
  4. 根据权利要求2所述的导光板，其中，所述凸起部为条状，所述凸起部的延伸方向平行于其所靠近的所述本体的侧面。
  5. 根据权利要求3所述的导光板，其中，所述凸起部为条状，所述凸起部的延伸方向平行于其所靠近的所述本体的侧面。
  6. 根据权利要求1所述的导光板，其中，所述本体包括一个用于入光的侧面，
    所述导光板设置有两个所述凸起部，其中一个所述凸起部靠近所述侧面，另一个所述凸起部背向所述侧面，
    两个所述凸起部均设置有朝向另一个凸起部的斜面，两个所述斜面连接成向内凹陷的弧面。
  7. 根据权利要求6所述的导光板，其中，所述弧面由圆弧或椭圆弧沿平行于所述侧面和所述出光面的直线的延伸方向平移而成。
  8. 根据权利要求6所述的导光板，其中，所述凸起部的顶端为尖棱。
  9. 根据权利要求7所述的导光板，其中，所述凸起部的顶端为尖棱。
  10. 根据权利要求1所述的导光板，其中，所述本体包括一个用于入光的侧面，所述凸起部构造为延伸方向平行于所述侧面的棱柱，所述凸起部沿背向所述出光面方向具有渐缩的宽度。
  11. 根据权利要求10所述的导光板，其中，所述凸起部的横截面为三角形。
  12. 根据权利要求11所述的导光板，其中，所述三角形为等腰直角三角形，所述等腰直角三角形的底边平行于所述出光面。
  13. 根据权利要求10所述的导光板，其中，所述凸起部为直棱柱。
  14. 根据权利要求11所述的导光板，其中，所述凸起部为直棱柱。
  15. 根据权利要求12所述的导光板，其中，所述凸起部为直棱柱。
  16. 一种液晶显示装置，包括导光板，
    所述导光板包括：
    板状的本体，所述本体的一个板面为出光面；以及
    从所述本体背向所述出光面的一侧向背向所述出光面方向凸出的凸起部。
PCT/CN2015/082187 2015-06-10 2015-06-24 背光模组及其导光板 Ceased WO2016197407A1 (zh)

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CN101354453A (zh) * 2007-07-27 2009-01-28 三星电子株式会社 准直光导板、散射单元以及使用它们的显示器
CN201628180U (zh) * 2010-03-19 2010-11-10 厦门伟然科技有限公司 一种兼备导光与散射功能的导光板
CN202870337U (zh) * 2012-11-01 2013-04-10 京东方科技集团股份有限公司 多层导光体、背光源模组以及显示装置
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