WO2017185845A1 - 背板、背光单元、显示装置及背光单元的组装方法 - Google Patents

背板、背光单元、显示装置及背光单元的组装方法 Download PDF

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Publication number
WO2017185845A1
WO2017185845A1 PCT/CN2017/072619 CN2017072619W WO2017185845A1 WO 2017185845 A1 WO2017185845 A1 WO 2017185845A1 CN 2017072619 W CN2017072619 W CN 2017072619W WO 2017185845 A1 WO2017185845 A1 WO 2017185845A1
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WO
WIPO (PCT)
Prior art keywords
body portion
main body
light
backlight unit
edge
Prior art date
Application number
PCT/CN2017/072619
Other languages
English (en)
French (fr)
Inventor
康亚玲
张晓初
施祖传
何书勇
吴波
刘祥
王培娜
Original Assignee
京东方科技集团股份有限公司
合肥京东方显示光源有限公司
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 京东方科技集团股份有限公司, 合肥京东方显示光源有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/548,521 priority Critical patent/US10506673B2/en
Priority to EP17742935.4A priority patent/EP3450821B1/en
Publication of WO2017185845A1 publication Critical patent/WO2017185845A1/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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • 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
    • G02B6/009—Positioning aspects of the light source in the package
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]

Definitions

  • the present disclosure relates to a backplane, a backlight unit, a display device, and a method of assembling a backlight unit.
  • the backlight unit generally includes a back plate, a light guide plate disposed on one side of the back plate, and a light source disposed opposite the light guide plate, for example, an LED light source.
  • a light source disposed opposite the light guide plate, for example, an LED light source.
  • optical members such as a reflection sheet, a diffusion sheet, and a brightness enhancement film may be further provided.
  • the light bar when assembling the backlight unit, the light bar generally adopts a manner of plugging the U-fold structure from the front side.
  • the opening of the U-fold structure is small, so the assembly of the light bar is difficult, and the positioning is inaccurate or the lamp bar is distorted and deformed, which affects the light effect of the light source.
  • Another embodiment of the present invention provides a display device including the above backlight unit.
  • Another embodiment of the present invention provides a method for assembling a backlight unit, including: providing the back plate, the light source, and the light guide plate; and disposing the light guide plate on a first main surface of the back plate a side through which the light source penetrates from the second main surface side of the main body portion of the back plate such that a light emitting portion of the light source is exposed on a first main surface side of the main body portion, and The light emitting surface of the light emitting portion faces the light incident surface of the light guide plate.
  • Yet another embodiment of the present invention provides a back sheet for the backlight unit described above.
  • FIG. 1 is a perspective view of a backplane structure according to an embodiment of the present invention.
  • FIG. 2 is a perspective view of a backplane including a hollow structure and a step structure according to an embodiment of the present invention
  • FIG. 3 is a top plan view showing a hollow structure of a main body portion according to an embodiment of the present invention.
  • FIG. 4a is a perspective view of a back panel mounting light bar according to an embodiment of the present invention.
  • FIG. 4b is a perspective view of an LED light bar according to an embodiment of the present invention.
  • 4c is a perspective view showing the structure of a backlight unit according to an embodiment of the present invention.
  • 4d is a schematic cross-sectional view of a backlight unit according to an embodiment of the present invention.
  • An embodiment of the present invention provides a backboard comprising: a body portion having a plate-like structure, the body portion including first and second major surfaces opposite to each other; and an extension portion including the extension portion a first portion of the body portion extending in a direction intersecting the first major surface, and a side opposite to a side of the first portion opposite to the body portion toward the body a second portion extending in a middle portion of the portion, the second portion being spaced apart from the body portion and at least partially overlapping in a thickness direction of the body portion; wherein a portion of the body portion adjacent to the extension portion is disposed There is a hollow structure.
  • the second portion and the main body portion are spaced apart from each other to mean that the two are not in contact;
  • the main body portion is a plate-like structure having a certain thickness
  • the thickness direction of the main body portion is, for example, perpendicular to the first main surface or the second main surface of the main body portion.
  • the at least partial overlap of the second portion with the body portion means that the projection of the second portion in a plane parallel to the body portion along the thickness direction at least partially overlaps the projection of the body portion on the plane.
  • the projection of the second part may fall into the main body
  • the extension portion may form a "U"-shaped bent portion with the main body portion, and the "U"-shaped bent portion may be used for, for example, a card.
  • the light guide plate of the backlight unit With the back plate of this structure, the light bar can be conveniently and accurately installed to obtain a backlight unit with better light effect.
  • the backing plate includes a main body portion 1 and an extension portion 2.
  • the body portion 1 includes a first major surface 101 and a second major surface 102 that are opposite each other.
  • the extension portion includes a first portion 21 extending from the edge 11 of the main body portion 1 in a direction intersecting the first main surface 101, and from a side of the first portion 21 opposite to a side connected to the main body portion 1 toward the main body portion 1
  • the second portion 22 of the central portion extends, the second portion 22 and the body portion 1 are spaced apart from each other and at least partially overlap the body portion 1 in the thickness direction of the body portion.
  • a portion of the main body portion 1 close to the extension portion 2 is provided with a hollow structure 3.
  • the second portion 22 of the extension 2 is, for example, parallel to the first major surface, the first portion 21 being, for example, perpendicular to the first major surface.
  • the direction in which the hollow structure 3 extends may be the same as the direction in which the first portion 21 of the extension 2 extends.
  • the shape and size of the extending portion are not particularly limited, and may be selected according to actual needs.
  • the extending portion may be formed by bending one edge of the back plate once and then bending it twice.
  • the extension may also be integrally formed by a mold.
  • the back plate may also be a substantially planar body portion and a separate extension portion fixedly connected to each other.
  • the extension does not necessarily have to be completely bent at one edge of the backing plate, or it may be partially bent.
  • the structure and formation manner of the extension portion are not particularly limited in the present invention. Generally, depending on the specific field of the backplane application, the extension is placed at the edge of the backsheet. Specifically, for a back plate having a substantially rectangular parallelepiped structure, an extension portion is provided only at one side edge thereof.
  • the backplane includes an extension as an example.
  • the backplane according to the embodiment of the present invention is not limited thereto, and the backplane according to the embodiment of the present invention may not be provided.
  • the extension portion and the main body portion may be formed by bending the same piece of sheet material or by joining different sheets.
  • the first portion and the second portion of the extension portion may also be the first bent portion and the second bent portion.
  • the first bent portion is bent from the first edge of the main body portion toward the first main surface side, and the second bent portion is away from the edge of the first bent portion away from the main body portion
  • the middle portion of the main body portion is bent, and the second bent portion and the main body portion are spaced apart from each other and at least partially overlap in a direction perpendicular to the first main surface. Therefore, the first bent portion, the second bent portion, and the main body portion may also form the above-described "U"-shaped bent structure.
  • a portion of the main body portion close to the extension portion is provided with a hollow structure.
  • Example of the action of the hollow structure If the light bar is fixed from the back surface of the back plate, the LED chip on the light bar can pass through the hollow surface and the light emitting surface faces the light incident surface of the light guide plate disposed on the front surface of the back plate.
  • the front side of the back panel refers to the side on which the light guide plate is disposed. That is, the hollow structure of the embodiment of the present invention needs to ensure that the LED chip on the light bar can pass through the hollow structure.
  • the hollow structure may at least partially overlap or not overlap each other in the thickness direction of the back plate main body portion.
  • the first portion is perpendicular to the first major surface and the second portion is parallel to the first major surface.
  • the hollow structure extends parallel to the first edge, a portion of the body portion along the first edge includes a stepped structure, the stepped structure including a second portion facing the extension a bent bent portion and a connecting portion connecting the edge of the bent portion close to the second portion and the first edge of the main body portion, the hollow structure being located at the bent portion and the connecting portion A portion near the bent portion.
  • the back plate includes a main body portion 1 and an extension portion 2 provided at one edge of the main body portion 1.
  • the extension 2 has, for example, the structure as described above.
  • the first portion 21 of the extension 2 extends in a first direction (the direction indicated by the arrow in the figure).
  • the extension 2 may be formed by completely bending one edge of the back panel.
  • the portion of the main body portion 1 adjacent to the extension portion 2 is provided with a hollow structure 3, for example for mating with an LED light strip.
  • the hollow structure 3 extends parallel to the first edge 11 of the body portion (i.e., the direction indicated by the arrow in Fig. 2).
  • the portion of the main body portion 1 along the first edge 11 includes a stepped structure including a bent portion 12 bent toward the second portion 22 of the extending portion 2 and an edge of the connecting bent portion 12 near the second portion 22.
  • the connecting portion 13 with the first edge 11 of the main body portion 1 (only a part of the stepped structure is shown), the hollow structure 3 is located at the bent portion 12 and a portion of the connecting portion 13 close to the bent portion 12.
  • the backing plate includes portions that are not hollowed out on both sides of the direction in which the hollow structure extends.
  • the length of the hollow structure matches the length of the light bar, for example, greater than or equal to the length of the light bar, so that the light bar can be mounted in place to ensure the light effect of the LED chip.
  • the size of the bent portion of the step structure in the thickness direction of the body portion is in the range of 0.1 mm to 0.3 mm. This dimension is, for example, equal to the thickness of the base of the light bar.
  • the back surface of the light bar base is flush with the second main surface of the back plate main body portion, so that the entire backlight unit is made thinner.
  • the front surface of the light bar base is on the same plane as the bottom surface of the light guide plate (the surface close to the first main surface of the back plate), so that the light emitted from the light exit surface of the LED can enter the light incident surface of the light guide plate more fully. Improve light efficiency.
  • the hollowed out structure and the extension at least partially overlap in the thickness direction of the backing plate body portion.
  • the structure of the backlight unit can be made more compact by limiting the positional relationship between the hollow structure and the extension.
  • the hollow structure includes a strip structure extending along a first edge of the body portion as seen in a plan view parallel to the first major surface of the body portion, and from the strip structure A plurality of protruding structures protruding toward the first edge and spaced apart in a direction parallel to the first edge.
  • FIG. 3 is a top plan view showing a hollow structure of the main body portion of the embodiment of the present invention. Referring to Fig. 3, the main body portion 1 (shaded area) is provided with a hollow structure 3 (white area).
  • the hollow structure 3 includes a strip structure 21 extending along the first edge 11 and a plurality of protruding structures 32 protruding from the strip structure 31 toward the first edge 11 and spaced apart in a direction parallel to the first edge 11.
  • the plurality of protrusions are arranged on the hollow structure, on the one hand, the positioning accuracy of the LED can be improved; on the other hand, the LED chip can be protected and the installation strength of the light bar on the back plate can be improved.
  • the distance h between the dimension h of the above-mentioned protruding structure 32 in the extending direction perpendicular to the first edge 11 and the side of the hollow structure 3 close to the first edge 11 and the side away from the first edge satisfy d/ 2 ⁇ h ⁇ 3d / 4.
  • h satisfies 0.8 mm ⁇ h ⁇ 1.3 mm.
  • h refers to a dimension of the protruding structure 32 in a direction perpendicular to the extending direction of the first edge 11. If h is too small, the LED chip cannot be effectively protected. The reason is that most of the LED chips are exposed outside the protruding structure 32.
  • the light guide plate or other optical components may squeeze the LED chips, thereby causing damage to the LED chips.
  • h should not be too large, otherwise the distance between the light emitting surface of the LED chip and the light incident surface of the light guide plate will be too large, which will affect the utilization of light. By adjusting the value of h, it is possible to effectively protect the LED chip while allowing the light emitted by the LED chip to enter the light incident surface of the light guide plate as much as possible.
  • the protruding structure is in the range of 3.2 mm to 4.4 mm along a dimension parallel to the first edge.
  • the dimension W satisfies 3.2 mm ⁇ W ⁇ 4.4 mm.
  • the distance between the hollow structure 3 away from the first edge 11 and near the first edge 11 may, for example, be greater than the dimension of the protruding structure 32 in a direction perpendicular to the direction in which the first edge 11 extends. That is, the protruding structure 32 is spaced from the side of the hollow structure 3 away from the first edge 11 by a certain distance to expose a part of the surface of the light guide plate through the hollow structure 3 on the second main surface side of the back plate. Therefore, when the light bar is pasted from the other side of the back plate, the side of the light bar provided with the LED chip can be attached to the surface of the portion of the light guide plate.
  • the portions of the light bar on both sides of the LED chip are respectively pasted on the surface of the back plate and the light guide plate near the first main surface side of the back plate and exposed through the hollow structure, thereby improving the lamp.
  • the strip is fixed in strength and makes full use of the light emitted by the LED chip.
  • the sidewall of the body portion surrounding the hollow structure is coated with an insulating layer.
  • the LED chip is soldered to, for example, a printed circuit board, and thus a partial solder fillet may be left. If these soldering angles contact the backplane, a short circuit may occur, which may cause the LED chip to malfunction.
  • an insulating layer may be provided around the inner wall of the hollow structure (ie, the insulating layer is provided on the surface of the entire hollow structure) and the printed circuit board and the back plate contact portion.
  • the material of the insulating layer may be plastic or rubber, or other insulating material.
  • plastic when plastic is used as the insulating layer, it can be injection molded into the corresponding position of the backing plate by insert molding.
  • the insulating material When rubber is used as the insulating material, it can also act as a buffer when the backlight unit is subjected to an external force, thereby ensuring that the soldering angle is not soldered and the LED chip is prevented from being damaged.
  • the installation position of the insulating layer and the method of setting the material of the insulating layer can be determined according to actual needs, which is not specifically limited in the present invention.
  • a backlight unit including the above-described back sheet, a first portion of an extension of the back sheet extending in a direction from the second main surface to the first main surface, the backlight The unit further includes: an LED light bar disposed on the second main surface side of the main body portion, and including a strip substrate and a plurality of LED chips spaced apart along an extending direction of the strip substrate; a light guide plate disposed at the The first main surface side of the main body portion of the back plate, wherein the LED chip of the LED light bar passes through the hollow structure, and the light emitting surface of the LED chip faces the light incident surface of the light guide plate.
  • extension is located on the first major surface side. That is, one side of the first portion of the extension intersects the first major surface and the other side extends away from the first major surface and the second major surface. Extending, and the second portion is spaced apart from the first major surface.
  • the backlight unit may further include other components, such as a reflective sheet, a diffusion sheet, a brightness enhancement film, etc., and those skilled in the art may not limit the invention.
  • a back sheet having an edge may be applied to, for example, a notebook computer, a tablet computer, or the like.
  • the first portion of the extension is, for example, perpendicular to the first major surface
  • the second portion is, for example, parallel to the first major surface
  • FIG. 4a is a perspective view of a back surface of a backlight unit according to an embodiment of the present invention
  • FIG. 4b is a perspective view of an LED light bar according to an embodiment of the present invention
  • FIG. 4c is a perspective view of a front structure of a backlight unit according to an embodiment of the present invention
  • the backlight unit includes a back plate, an LED light bar 4, and a light guide plate 5 disposed on a first main surface side of the back plate; an edge of the back plate is provided with an extension 2, and the back plate is adjacent to the extension 2 Partially provided with a hollow structure 3; the LED light bar 4 is disposed from the second main surface side of the back plate, and the LED chip 41 passes through the hollow structure 3; on the first main surface side of the back plate, the light emitting surface of the LED chip 41 Facing the light incident surface of the light guide plate 5.
  • the backing plate includes an extension disposed at an edge thereof and a body portion 1 coupled to the extension portion; a portion of the backing plate adjacent the extension portion 2 is provided with a hollow structure 3.
  • the hollow structure 3 includes a strip structure 31 extending along the first edge 11 of the body portion 1, and protruding from the strip structure 31 toward the first edge 11 and parallel to the first edge 11 A plurality of protruding structures 32 are arranged in a direction spaced apart.
  • the LED chip on the light bar 4 is embedded in the protruding structure 32 from the second main surface side of the backing plate (only a part of the light bar is shown in the drawing).
  • portions of the light bar 4 located on both sides of the LED chip in the width direction thereof may be respectively pasted on the second main surface side of the back plate and the partial surface of the light guide plate exposed from the hollow structure 3, respectively, thereby Improve the fixing effect of the light bar.
  • the hollow structure extends parallel to the first edge, and a portion of the body portion along the first edge includes a stepped structure including a portion facing the extension a two-part bent bent portion and a connecting portion connecting the edge of the bent portion adjacent to the second portion and the first edge, the hollow structure being located at the bent portion and the connecting portion being close to A portion of the bent portion.
  • the LED light bar 4 includes a strip substrate 42 and an LED chip 41 on the strip substrate 42. In the extending direction of the strip substrate 42, the LED chips 41 are spaced apart.
  • FIG. 4c is a perspective view showing a front structure of a backlight unit according to an embodiment of the present invention.
  • the hollow structure 3 is disposed adjacent to the extension and parallel to the first edge of the body portion, the portion of the body portion along the first edge comprising a stepped structure comprising a bend that is bent toward the second portion of the extension And a connecting portion of the edge of the connecting portion close to the second portion and the first edge, the hollow structure is located at a portion of the bent portion and the connecting portion near the bent portion.
  • the light bar and the light guide plate can be closely adhered to the surface on the first main surface side of the back plate, thereby ensuring that the light emitted from the light emitting surface of the LED sufficiently enters the light incident surface of the light guide plate.
  • the light guide plate 5 is disposed on the first major surface side of the backing plate (only a portion of the backlight unit is illustrated in the figures to illustrate the hollowed out structure of the backing plate). After the light guide plate 5 and the LED light bar are mounted in position, the light exit surface of the light guide plate 5 and the light exit surface of the LED chip on the light bar 4 disposed from the second main surface side of the back plate face each other.
  • the size of the bent portion of the step in the thickness direction of the main body portion is substantially the same as the thickness of the base of the LED light bar.
  • the bent portion of the step may have the same thickness in the thickness direction of the main body portion as the base thickness of the light bar 4, such that one surface of the base of the LED light bar 4 may be opposite to the second main surface of the back plate The side surfaces are flush, thereby making the backlight unit thinner.
  • the tape 9 is highlighted in a larger thickness in Fig. 4d, but in actual products, the thickness of the glue layer 9 can be small.
  • the other surface of the base of the LED light bar 4 is on the same plane as the surface of the light guide plate 5 adjacent to the first main surface of the back plate, thereby ensuring sufficient light entering the light emitting surface of the LED chip on the light bar 4.
  • the light-incident surface of the light guide plate 5 is used to increase the display brightness of the display device.
  • the step structure in the backing plate is disposed such that the body portion is a first portion and a second portion that are staggered in a direction perpendicular to the first major surface, the hollow structure being located in the first portion.
  • the portion of the body portion located at the upper left of the member represented by the numeral "12" may be the first portion, and the portion of the body portion located at the lower right portion thereof may be the second portion.
  • the pitch of the first portion and the second portion of the body portion in the direction perpendicular to the first major surface is substantially the same as the thickness of the strip substrate of the light source.
  • the base of the light bar (the side provided with the LED chip) may be located on both sides of the LED chip in the width direction thereof, and may be respectively connected to the other side surface of the back plate and a part of the surface of the light guide plate exposed from the hollow structure. fixed.
  • the fixing means may be bonded to each other, or may be a screw or the like.
  • the hollow structure at least partially overlaps the extension in a thickness direction of the backing plate.
  • the LED chip is disposed on a side of the hollow structure near the first edge such that the LED and the second portion of the extension at least partially overlap in the thickness direction of the back plate, thereby making the structure of the backlight unit more compact.
  • the hollow structure includes a strip structure extending along a first edge of the body portion as seen in a plan view parallel to the first major surface of the body portion, and from the strip structure a plurality of protruding structures protruding toward the first edge and spaced apart in a direction parallel to the first edge (which may be combined with the previous figures and description), the LED chip in the LED light bar at least partially embedded in the Highlight the structure.
  • the LED chips disposed on the light strip 4 are matched to the protruding structure 31, i.e., the LED chips on the light strip 4 are at least partially embedded in the protruding structure 31.
  • the hollow structure includes the above-mentioned protruding structure, which can accurately position the LED chip; on the other hand, it can also protect the LED chip. For example, it is possible to prevent the backlight unit from damaging the LED when it is pressed by an external force.
  • the hollow structure includes a strip structure extending along a first edge of the body portion and protruding from the strip structure toward the first edge, as viewed in a plan view parallel to the first major surface of the body portion A plurality of protruding structures arranged in a direction parallel to the first edge.
  • a base of the LED light bar (a side on which the LED chip is provided) a portion on both sides of the LED chip in the width direction of the substrate, and a second main surface side of the back plate and a light guide plate near the first main surface and passing through the hollow
  • the exposed surface of the structure is fixed.
  • the fixing means may be bonding to each other, or a screw or the like may be employed.
  • the backlight unit includes a back plate, an LED light bar 4, and a light guide plate 5.
  • An LED chip 41 is disposed on the LED light bar.
  • the LED strip 4 is attached to the second main surface of the back sheet by a tape 9 on one side of the LED chip in a width direction thereof (for example, a direction parallel to the first main surface and perpendicular to the first edge), And the other side is pasted on the surface of the light guide plate 5 adjacent to the first main surface of the back plate 5 and exposed by the hollow structure.
  • the portion of the substrate on which the LED chip is disposed and located between adjacent LED chips may be attached to the second main surface side of the back sheet by, for example, a tape to further improve the fixing effect.
  • the portions of the light bar on both sides of the LED chip in the width direction are respectively pasted on the back plate and the light guide plate, which can improve the fixing effect of the light bar and prevent the light effect from being affected by the distortion of the light bar.
  • the LED chips pass through the hollow structure and are disposed facing each other with the light incident surface of the light guide plate 5.
  • a certain gap (not shown) is left between the light incident surface of the light guide plate 5 and the light incident surface of the LED chip 41, so that the LED can effectively dissipate heat.
  • a reflection sheet 6 which is disposed between the light guide plate 5 and the extension portion 2.
  • an optical film such as a diffusion sheet or a brightness enhancement film may be disposed on the side of the light guide plate away from the back plate.
  • the sidewall of the body portion surrounding the hollow structure may be coated with an insulating layer, for example.
  • an insulating layer 7 may be applied to the sidewall of the body portion surrounding the hollow structure.
  • the insulating material may be plastic or rubber.
  • insert molding techniques can be used to mold plastic or rubber into the desired location.
  • a light source of a backlight unit with the LED light bar may be any suitable light source, for example, may be a cold cathode ray tube (CCFL) light source.
  • CCFL cold cathode ray tube
  • a light source of a backlight unit according to an embodiment of the present invention includes a strip substrate and a light emitting portion disposed on the strip substrate.
  • the light emitting portion may include a plurality of sub-light emitting portions spaced apart in the extending direction of the strip substrate.
  • each of the sub-light emitting portions may be an LED chip.
  • the body portion of the backboard includes the first major surface and the second major surface, but this is not limited to the first major surface and the second major surface being strictly planar.
  • the main surface is not a strictly flat surface, but since the height of the stepped structure is small, the main surface of the main body portion may also be a substantially flat surface.
  • the direction parallel or perpendicular to the first major surface may be a major surface parallel to or perpendicular to the first portion and the second portion divided by the stepped structure, respectively.
  • the first portion and the second portion of the body portion are parallel to each other.
  • the backplane of the backlight unit according to the embodiment of the present invention may employ a backplane according to an embodiment of the present invention, and the backplane according to an embodiment of the present invention may also be applied to a backlight unit according to an embodiment of the present invention.
  • the description of the backsheet in different embodiments may be combined or replaced with each other.
  • the light guide plate of the backlight unit in the embodiment of the invention may be any component having a light guiding function.
  • it may include a structure in which various functional layers such as a diffusion layer, a reflective layer, and a scattering layer are formed on a single light guide plate.
  • the back sheet according to the embodiment of the present invention may not be provided with the extension portion, and therefore, the back sheet in the backlight unit according to the embodiment of the present invention may not be provided with the extension portion.
  • the end of the light guide plate cannot be fixed by the "U" type structure of the back plate, but may be fixed to the back plate by any other suitable means such as sticking.
  • the first edge herein is not limited to the first edge shown in the drawing. 11.
  • the first edge may be one of the sides, two sides, three sides, or four sides of the rectangle, for example, may be two opposite sides of the rectangle. That is, the "first edge" of the body portion may be at least a portion of all edges of the body portion.
  • Still another aspect of the present invention provides a display device including the backlight unit as described above.
  • a further aspect of the present invention provides a method of assembling a backlight unit including a backplane provided by an embodiment of the present invention, including:
  • the LED light bar is disposed on a second main surface side of the main body portion of the back plate, and the LED chip of the light bar is passed through the hollow structure to make the light emitting surface of the LED chip and the The light incident surfaces of the light guide plate face each other.
  • the assembly method of the backlight unit includes, for example, the following steps: Referring to FIG. 2, a back plate having an extension portion is provided, and a portion of the back plate adjacent to the extension portion is provided as a hollow structure, that is, a back plate structure provided by an embodiment of the present invention.
  • the hollow structure includes a first edge extension along the body portion a strip structure extending, and a plurality of protruding structures protruding from the strip structure toward the first edge and spaced apart in a direction parallel to the first edge.
  • the extension portion may be bent twice, for example, the back plate and the U-shaped structure which are integrally formed by the film or the flat structure may be fixedly connected to each other.
  • the hollow structure is obtained, for example, by machining, such as cutting, rinsing, and the like.
  • a portion of the main body portion close to the first edge as a stepped structure, that is, a portion of the main body portion along the first edge includes a stepped structure, and the stepped structure includes a second toward the extending portion a partially bent bent portion and a connecting portion of the connecting portion of the bent portion close to the second portion and the first edge, and the hollow structure is located at the bent portion and a portion of the connecting portion close to the bent portion.
  • the size of the bent portion of the step structure in the thickness direction of the body portion may be, for example, the same as the thickness of the light bar.
  • the step structure, the hollow structure, and the extension can be matched to the preparation. For example, first, an edge of a metal plate having a planar structure is bent to form an extension; then, the back plate is bent twice at a distance from the extension of the back plate to form a step substantially parallel to the extension; The backing plate is hollowed out from the intermediate position of its step toward the side of the extension to obtain the desired backing plate structure.
  • the LED chip 41 is soldered to the light bar 4, for example, by soldering.
  • the light bar 4 is attached to the back plate from the second main surface side of the back plate (the side opposite to the side on which the light guide plate is disposed), and the LED chips are correspondingly embedded in the respective protruding structures of the hollow structure.
  • the light guide plate is disposed on the first main surface side of the back plate, and the light emitting surface of the light guide plate and the light incident surface of the LED chip are disposed opposite to each other.
  • the order of the light bar application and the setting of the light guide plate is not specifically required, and may be selected according to actual conditions.
  • the LED chip on the light bar passes through the hollow structure, the light-emitting surface and the light-incident surface of the light guide plate disposed on the first main surface side of the back plate face each other.
  • the combination of various shapes, sizes, and the like of the back sheet and the backlight unit as described above can be employed in the assembly method of the backlight unit, and similar technical effects can be produced, with reference to the foregoing description.
  • a reflection sheet, a diffusion sheet, a brightness enhancement film, and the like may be further provided.
  • the portions of the substrate of the LED light bar that are located on both sides of the LED chip in the width direction of the substrate are respectively bonded to the second main surface of the back plate and the first main surface of the light guide plate, respectively. A part of the surface of the hollow structure is exposed.
  • the light guide plate is disposed on the first side of the backboard such that a positioning line is disposed on the first main surface side of the backboard, and the light guide panel is mounted in position according to the positioning line.
  • a positioning line is disposed on the first main surface side of the backboard, and the light guide panel is mounted in position according to the positioning line.
  • the method for fixing the light guide plate on the first main surface side of the back plate is, for example, bonding the side of the light guide plate away from the extension portion and the first main surface of the back plate to each other; the method for fixing the LED light bar is, for example, The double-sided tape is attached to, for example, the second major surface of the backsheet.
  • the terms “mounted,” “connected,” and “connected” are used in a broad sense, and may be, for example, a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be directly connected, or it can be connected indirectly through an intermediate medium, which can be the internal connection of two components.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

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Abstract

一种背板、背光单元、显示装置及背光单元的组装方法。该背光单元包括：背板，包括主体部（1），主体部（1）具有彼此相对的第一主表面（101）和第二主表面（102），且主体部（1）设置有镂空结构（3）；光源（4），从主体部（1）的第二主表面侧穿过镂空结构（3），且光源（4）的发光部在主体部（1）的第一主表面侧露出；导光板（5），设置于背板的主体部（1）的第一主表面侧，其中，光源（4）的发光部包括出光面，且出光面面对导光板的入光面。该背光单元可以使光源的定位更加精确，确保了光效。

Description

背板、背光单元、显示装置及背光单元的组装方法 技术领域
本公开涉及一种背板、背光单元、显示装置及背光单元的组装方法。
背景技术
背光单元通常包括背板、设置于背板一侧的导光板，与导光板面对设置的光源，例如，LED光源。为了提高背光单元的光效，例如可以进一步设置反射片、扩散片和增亮膜等光学部件。对于具有U折结构的背板，组装背光单元时，灯条一般采用从正面塞进U折结构的方式。通常情况下，U折结构的开口较小，因此灯条的组装较为困难，且容易出现定位不精确甚至灯条扭曲变形等情况，影响光源的光效。
发明内容
本发明的一个实施例提供一种背光单元，包括：背板，包括主体部，所述主体部具有彼此相对的第一主表面和第二主表面，且所述主体部设置有镂空结构；光源，从所述主体部的第二主表面侧穿过所述镂空结构，且所述光源的发光部在所述主体部的第一主表面侧露出；导光板，设置于所述背板的主体部的第一主表面侧，其中，所述光源的发光部包括出光面，且所述出光面面对所述导光板的入光面。本发明的再一个方面提供了一种包括上述背光单元的显示装置。
本发明的另一个实施例提供一种包括上述背光单元的显示装置。
本发明的另一个实施例提供一种上述背光单元的组装方法，包括：提供所述背板、所述光源以及所述导光板；将所述导光板设置于所述背板的第一主表面侧，将所述光源从所述背板的主体部的第二主表面侧贯穿所述镂空结构，以使所述光源的发光部在所述主体部的第一主表面侧露出，且所述发光部的出光面面对所述导光板的入光面。
本发明的又一个实施例提供一种用于上述背光单元的背板。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例，而非对本发明的限制。
图1为本发明实施例的背板结构的立体示意图；
图2为本发明实施例的背板包括镂空结构和台阶结构的立体示意图；
图3为本发明实施例的主体部设有镂空结构的俯视示意图；
图4a为本发明实施例的背板安装灯条的立体示意图；
图4b为本发明实施例的LED灯条的立体示意图；
图4c为本发明实施例的背光单元结构的立体示意图；
图4d为本发明实施例的背光单元的剖视示意图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面将结合本发明实施例的附图，对本发明实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于所描述的本发明的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明的实施例提供了一种背板，包括：具有板状结构的主体部,所述主体部包括彼此相对的第一主表面和第二主表面；以及延伸部，所述延伸部包括从所述主体部的第一边缘沿与所述第一主表面相交的方向上延伸的第一部分，以及从所述第一部分的与连接到所述主体部的一侧相反的一侧朝向所述主体部的中部延伸的第二部分，所述第二部分与所述主体部彼此间隔且在所述主体部的厚度方向上至少部分重叠；其中，所述主体部的靠近所述延伸部的部分设置有镂空结构。
例如，第二部分与主体部彼此间隔是指二者不接触；主体部为板状结构，具有一定的厚度，主体部厚度方向例如是指垂直于主体部的第一主表面或第二主表面的方向。第二部分与主体部至少部分重叠例如是指第二部分沿所述厚度方向在平行于所述主体部的平面上的投影与所述主体部在上述平面上的投影至少部分重叠。例如，上述第二部分的投影可以全部落入到上述主体部 的投影内，也可以只有一部分落入到上述主体部的投影内对于上述延伸部，其可以与主体部形成一个“U”型弯折部，该“U”型弯折部例如可以用于卡住背光单元的导光板。采用这种结构的背板，可以方便、准确地安装灯条，以获得光效较好的背光单元。
参照图1，背板包括主体部1和延伸部2。主体部1包括彼此相对的第一主表面101和第二主表面102。延伸部包括从主体部1的边缘11沿与第一主表面101相交的方向上延伸的第一部分21，以及从第一部分21的与连接到主体部1的一侧相反的一侧朝向主体部1的中部延伸的第二部分22，第二部分22与主体部1彼此间隔且在主体部的厚度方向上与主体部1至少部分重叠。主体部1的靠近延伸部2的部分设置有镂空结构3。继续参照图1，延伸部2的第二部分22例如与第一主表面平行，第一部分21例如与第一主表面垂直。例如，镂空结构3的延伸方向可以与延伸部2第一部分21的延伸方向相同。
需要说明的是，该延伸部的形状及尺寸并不特别限定，可以根据实际需要选择。该延伸部的形成方式例如可以为将背板的一个边沿一次弯折后，再进行二次弯折而成。例如，该延伸部也可以是通过模具一体成型。例如，该背板也可以是基本为平面的主体部与独立的延伸部彼此固定连接而成。此外，延伸部也并非必需是背板一个边缘完全弯折，也可以是部分弯折。本发明对延伸部的结构及形成方式不做特别限定。一般来说，根据背板应用的具体领域，延伸部设置于背板的边缘。具体的，对于一种基本为长方体结构的背板，仅在其一个侧面边缘设置延伸部。
需要说明的是，虽然上述实施例中以背板包括延伸部为例进行了说明，但根据本发明实施例的背板并不限制于此，根据本发明实施例的背板也可以不设置上述延伸部。另外，上述延伸部和主体部也可以是通过同一块板材弯折形成或通过不同板材连接而形成。上述延伸部的第一部分和第二部分也可以成为第一弯折部和第二弯折部。例如，第一弯折部从所述主体部的所述第一边缘向所述第一主表面侧弯折，第二弯折部从所述第一弯折部的远离所述主体部的边缘向所述主体部的中部弯折，所述第二弯折部与所述主体部彼此间隔且在垂直于所述第一主表面的方向上至少部分重叠。因此，第一弯折部、第二弯折部和主体部也可以形成上述的“U”型弯折结构。
另外，主体部靠近延伸部的部分设置有镂空结构。该镂空结构的作用例 如是灯条从背板的背面固定后，灯条上的LED芯片能够穿过该镂空结构后出光面与在背板正面设置的导光板的入光面面对设置。背板的正面是指设置导光板的一侧。即本发明的实施例的镂空结构需要保证灯条上的LED芯片能够穿过镂空结构。例如，该镂空结构在背板主体部厚度方向上可以与延伸部至少部分重叠或者彼此不重叠。
在一个实施例中，例如，所述第一部分与所述第一主表面垂直，所述第二部分与所述第一主表面平行。
在一个实施例中，所述镂空结构平行于所述第一边缘延伸，所述主体部的沿所述第一边缘的部分包括台阶结构，所述台阶结构包括朝向所述延伸部的第二部分弯折的弯折部以及连接所述弯折部的靠近所述第二部分的边缘与所述主体部的第一边缘的连接部，所述镂空结构位于所述弯折部以及所述连接部的靠近所述弯折部的部分。
参照图2，背板包括主体部1和与设置于主体部1一个边缘的延伸部2。该延伸部2例如具有如上所述的结构。继续参照图2，延伸部2的第一部分21沿第一方向(图中箭头所示的方向)延伸。例如，延伸部2可以是背板的一个边缘完全弯折而成。主体部1的靠近延伸部2的部分设置有镂空结构3，该镂空结构3例如用于与LED灯条配合。镂空结构3平行于主体部第一边缘11延伸(即图2中箭头所指示的方向)。主体部1的沿第一边缘11的部分包括台阶结构，台阶结构包括朝向所述延伸部2的第二部分22弯折的弯折部12以及连接弯折部12的靠近第二部分22的边缘与主体部1的第一边缘11的连接部13(图中仅示出台阶结构的一部分)，镂空结构3位于弯折部12以及所述连接部13的靠近所述弯折部12的部分。通过设置台阶，使得灯条安装后，设有LED芯片的一个表面与导光板靠近背板第一主表面的表面齐平，以充分利用光效。这种设置台阶结构的背板还可以使背光单元更加薄型化。
在该实施例中，所述背板在所述镂空结构的延伸方向的两侧分别包括未镂空的部分。
在上述实施例中，镂空结构的长度与灯条长度相匹配，例如大于或等于灯条的长度，以使灯条能够安装到位，确保LED芯片的光效。
在一个实施例中，所述台阶结构的弯折部沿所述主体部的厚度方向的尺寸在0.1mm至0.3mm的范围内。该尺寸例如与灯条基底的厚度相等。以保 证灯条从背板背面安装后，灯条基底的背面与背板主体部的第二主表面齐平，使整个背光单元更加薄型化。同时，灯条基底正面与导光板底面(靠近背板的第一主表面的表面)处于同一个平面上，进而LED的出光面所发出的光可以更充分的进入到导光板的入光面，提高光效。
在一个实施例中，镂空结构与延伸部在背板主体部的厚度方向上至少部分重叠。通过限制镂空结构与延伸部的位置关系，可以使背光单元的结构更加紧凑。
在一个实施例中，在平行于所述主体部的第一主表面的平面图中看，所述镂空结构包括沿所述主体部的第一边缘延伸的条形结构，以及从所述条形结构向所述第一边缘突出且沿平行于所述第一边缘的方向间隔排列的多个突出结构。图3本发明实施例主体部设有镂空结构的俯视示意图。参照图3，主体部1(阴影区域)设有镂空结构3(白色区域)。镂空结构3包括沿第一边缘11延伸的条型结构21以及从条型结构31向第一边缘11突出且沿平行于所述第一边缘11的方向间隔排列的多个突出结构32。将镂空结构设置多个突起，一方面可以提高对LED的定位精度；另一方面，也可以起到保护LED芯片以及提高灯条在背板上的安装强度等作用。
参照图3，上述突出结构32在垂直于第一边缘11的延伸方向上的尺寸h与镂空结构3靠近第一边缘11的一侧与远离第一边缘的一侧之间的距离d满足d/2≤h≤3d/4。例如，h满足0.8mm≤h≤1.3mm。参照图3，h是指突出结构32在垂直于第一边缘11的延伸方向上的尺寸。如果h过小，则无法有效保护LED芯片。其原因是LED芯片的大部分露在突出结构32之外，在组装背光单元时，导光板或其它光学部件可能会挤压这些LED芯片，从而造成LED芯片的损坏。另一方面，h也不能过大，否则会导致LED芯片出光面与导光板入光面之间的距离过大，影响光的利用率。通过调整h值，可以在有效保护LED芯片的同时，尽可能的使LED芯片发出的光进入到导光板的入光面。
例如，所述突出结构在沿平行于所述第一边缘的尺寸在3.2mm至4.4mm的范围内。参照图3，该尺寸W满足3.2mm≤W≤4.4mm。一方面，如果W过大，则不能起到有效保护和定位LED芯片的作用；另一方面，如果W过小，则会造成LED芯片安装困难，或者损坏LED芯片。通过调整W值，可以在 方便安装的同时，有效保护和定位LED芯片。
在一个实施例中，镂空结构3远离第一边缘11与靠近第一边缘11之间的距离例如可以大于突出结构32在垂直于第一边缘11的延伸方向上的尺寸。即突出结构32到镂空结构3远离第一边缘11一侧留有一定的距离，以在背板的第二主表面侧通过镂空结构3露出导光板的部分表面。从而当灯条从背板另一侧粘贴时，灯条的设有LED芯片一侧可以与导光板的该部分表面贴合。也就是说，在灯条的宽度方向上，灯条位于LED芯片两侧的部分例如分别粘贴于背板和导光板靠近背板第一主表面侧且通过镂空结构露出的部分表面，从而提高灯条的固定强度，并且充分利用LED芯片发出的光。
在一个实施例中，所述主体部的围绕所述镂空结构的侧壁涂覆有绝缘层。LED芯片是通过焊接方式焊接于例如印刷电路板，因此可能留有部分焊角。这些焊角如果接触背板，则可能发生短路，使LED芯片无法正常工作。例如，可以在背板主体部环绕镂空结构的内壁(即在整个镂空结构的表面设置绝缘层)以及印刷电路板与背板接触部分设置一层绝缘层。例如，该绝缘层的材料可以是塑料或者橡胶，或者其它具有绝缘作用的材料。例如，当采用塑料作为绝缘层时，可以通过镶件注塑技术注塑在背板的对应位置。采用橡胶作为绝缘材料时，还可以在背光单元受到外力时，起到缓冲作用，从而保证焊角不会开焊，避免LED芯片受到损害。绝缘层的设置位置以及绝缘层材料的设置方法可以根据实际需要确定，本发明对此不作具体限定。
本公开的另一个方面提供了一种包括上述背板的背光单元，所述背板的延伸部的第一部分沿从所述第二主表面到所述第一主表面的方向延伸，所述背光单元还包括：LED灯条，设置于所述主体部的第二主表面侧，且包括条状基底以及沿所述条状基底的延伸方向间隔设置的多个LED芯片；导光板，设置于所述背板的主体部的第一主表面侧，其中，所述LED灯条的LED芯片穿过所述镂空结构，且所述LED芯片的出光面面对所述导光板的入光面。通过将背板靠近延伸部的部分设置镂空结构，并将LED灯条从背板另一侧设置，可以对灯条方便的进行精确定位，避免灯条的弯曲变形，确保光源的光效。
需要指出的是，延伸部位于第一主表面侧。也就是说，延伸部的第一部分的一侧与第一主表面相交，另一侧向远离第一主表面和第二主表面方向延 伸，且第二部分与第一主表面相对间隔设置。
需要说明的是，背光单元还可以包括其它元部件，例如，反射片、扩散片、增亮膜等，本领域技术人员不得对本发明作限制解释。这种边缘具有延伸部的背板例如可以应用于笔记本电脑、平板电脑等。
另外，如上所述，延伸部的第一部分例如与第一主表面垂直，第二部分例如与第一主表面平行。
图4a为本发明实施例背光单元背面结构的立体示意图；图4b为本发明实施例的LED灯条的立体示意图；图4c为本发明实施例背光单元的正面结构的立体示意图；图4d为本发明实施例的背光单元的剖视示意图。参照图4a-图4d，背光单元包括背板、LED灯条4和设置于背板第一主表面侧的导光板5；背板的边缘设置有延伸部2，背板的靠近延伸部2的部分设置有镂空结构3；所述LED灯条4从背板的第二主表面侧设置，且LED芯片41穿过镂空结构3；在背板的第一主表面侧，LED芯片41的出光面面对导光板5的入光面设置。
以下结合图4a到图4d对本发明实施例的背光单元具体结构进行详细描述。
图4a为背光单元的背面结构立体图。参照图4a，背板包括设置于其边缘的延伸部以及与所述延伸部连接的主体部1；背板的靠近延伸部2的部分设置有镂空结构3。例如，如上所述，镂空结构3包括沿主体部1的第一边缘11延伸的条形结构31，以及从所述条形结构31向第一边缘11突出且沿平行于所述第一边缘11的方向间隔排列的多个突出结构32。灯条4上的LED芯片从背板的第二主表面侧嵌入到突出结构32中(图中仅示出了灯条的一部分)。此外，如图所示，灯条4在其宽度方向上位于LED芯片两侧的部分例如可以分别粘贴在背板第二主表面侧以及从镂空结构3中露出的导光板的部分表面上，从而提高灯条的固定效果。
在一个实施例中，例如，所述镂空结构平行于所述第一边缘延伸，所述主体部的沿所述第一边缘的部分包括台阶结构，所述台阶结构包括朝向所述延伸部的第二部分弯折的弯折部以及连接所述弯折部的靠近所述第二部分的边缘与所述第一边缘的连接部，所述镂空结构位于所述弯折部以及所述连接部靠近所述弯折部的部分。
图4b为根据本发明实施例的LED灯条的立体示意图。如图4b所示，该LED灯条4包括条状基底42和位于条状基底42上的LED芯片41。在条状基底42的延伸方向上，LED芯片41间隔排列。
图4c为本发明实施例背光单元的正面结构的立体图。参照图4c，镂空结构3靠近延伸部设置且平行于主体部第一边缘延伸，主体部的沿第一边缘的部分包括台阶结构，该台阶结构包括朝向延伸部的第二部分弯折的弯折部以及连接弯折部的靠近第二部分的边缘与第一边缘的连接部，镂空结构位于弯折部以及连接部靠近弯折部的部分。通过设置台阶结构，可以使灯条与导光板靠近背板第一主表面侧的表面紧密贴合，从而确保LED的出光面所发出的光充分的进入到导光板的入光面。有关台阶结构以及镂空结构，可参照之前的附图及描述。
继续参照图4c，导光板5设置于背板的第一主表面侧(图中仅示意出了背光单元的一部分，以示意出背板的镂空结构)。导光板5与LED灯条安装到位后，导光板5的出光面与从背板第二主表面侧设置的灯条4上的LED芯片的出光面彼此面对。
在该实施例中，例如，台阶的弯折部在主体部厚度方向上的尺寸与所述LED灯条的基体的厚度大致相同。继续参照图4c，例如，台阶的弯折部在主体部厚度方向上的尺寸可以与灯条4的基底厚度相同，这样，LED灯条4的基体的一个表面可以与背板的第二主表面侧表面齐平，从而使背光单元更加薄型化。需要注意的是，在图4d中胶带9以较大的厚度突出显示，但实际产品中则胶层9的厚度可以很小。同时，LED灯条4的基体的另一个表面与导光板5靠近背板第一主表面的表面处于同一个平面上，进而确保灯条4上的LED芯片的出光面所发出的光充分的进入到导光板5的入光面，提高显示装置的显示亮度。
例如，上述背板中台阶结构的设置使得所述主体部分成在垂直所述第一主表面的方向上错开的第一部分和第二部分，所述镂空结构位于所述第一部分中。例如，如图5a所示，位于标号“12”代表的部件的左上方的主体部的部分可以是第一部分，位于其右下方的主体部的部分可以是第二部分。在这种情况下，如图4d所示，所述主体部的第一部分和第二部分在垂直所述第一主表面的方向上的间距与所述光源的条状基底的厚度大致相同。
在一个实施例中，灯条的基体(设有LED芯片的侧)在其宽度方向上位于LED芯片两侧的部分可以分别与背板另一侧表面以及从镂空结构露出的导光板的部分表面固定。例如，固定方式可以为彼此黏结，也可以是采用螺钉或其它方式。从而充分利用LED芯片发出的光，并使背光单元结构紧凑，实现背光单元的薄型化。
在一个实施例中，在所述背板的厚度方向上，所述镂空结构与所述延伸部至少部分重叠。例如，LED芯片设置于镂空结构的靠近第一边缘的一侧，这样LED与延伸部第二部分在背板厚度方向上至少部分重叠，从而使背光单元的结构更加紧凑。
在一个实施例中，在平行于所述主体部的第一主表面的平面图中看，所述镂空结构包括沿所述主体部的第一边缘延伸的条形结构，以及从所述条形结构向所述第一边缘突出且沿平行于所述第一边缘的方向间隔排列的多个突出结构(可结合之前的附图及描述)，所述LED灯条中的LED芯片至少部分嵌入所述突出结构中。如图4a-4c所示，灯条4上设置的LED芯片与突出结构31相匹配，即灯条4上的LED芯片至少部分嵌入所述突出结构31中。如前所述，一方面，镂空结构包括上述突出结构，可以对LED芯片进行精确定位；另一方面，也可以对LED芯片起到保护作用。例如可以防止背光单元在受到外力挤压时，损坏LED。
有关突出结构的相关尺寸，可参照之前的描述。
在一个实施例中，在平行于所述主体部的第一主表面的平面图中看，镂空结构包括沿主体部的第一边缘延伸的条形结构，以及从条形结构向第一边缘突出且沿平行于第一边缘的方向间隔排列的多个突出结构。LED灯条的基底(设有LED芯片的一侧)在基底的宽度方向上位于LED芯片两侧的部分分别与背板第二主表面侧以及导光板的靠近第一主表面且通过所述镂空结构暴露出的部分表面固定。例如，固定方式可以为彼此黏结，也可以采用螺钉或其它的方式。图4d为本发明实施例的背光单元的剖视示意图，其剖切位置为图4c中沿边缘11的方向且穿过LED芯片41的位置。参照图4d，背光单元包括背板、LED灯条4以及导光板5。LED灯条上设置有LED芯片41。LED灯条4在其宽度方向(例如，平行于所述第一主表面且垂直于所述第一边缘的方向)上位于LED芯片的一侧通过胶带9粘贴于背板的第二主表面， 且另一侧通过胶带9粘贴于导光板5的靠近背板第一主表面且通过镂空结构露出的部分表面。上述基底的设有LED芯片的一侧且位于相邻的LED芯片之间的部分例如也可以通过例如胶带粘贴在背板的第二主表面侧，以进一步提高固定效果。灯条在其宽度方向上位于LED芯片两侧的部分分别粘贴在背板和导光板，可以提高灯条的固定效果，防止因灯条发生扭曲变形而影响光效。
继续参照图4d，灯条4从背板第二主表面侧设置后，LED芯片穿过镂空结构且与导光板5的入光面彼此面对设置。例如，导光板5的入光面与LED芯片41的入光面之间留有一定间隙(图中未示出)，以使LED能够有效散热。同时，延伸部的第一部分及第二部分与LED之间有一定的间隔。图中还示意出反射片6，其设置于导光板5与延伸部2之间。进一步的，还可以在导光板远离背板一侧设置扩散片、增亮膜等光学膜片。
需要说明的是，主体部的围绕所述镂空结构的侧壁例如可以涂覆绝缘层。例如，如图4c所示，绝缘层7可以涂覆在主体部的围绕所述镂空结构的侧壁。例如，还可以在灯条与背板接触的部分均设置绝缘材料。如前文所述，例如该绝缘材料可以是塑料或橡胶。例如，可以采用镶件注塑技术将塑料或橡胶注塑到所需位置。通过设置绝缘材料，可以避免灯条的LED芯片的焊角与背板发生接触而导致短路，确保背光单元的可靠工作。同时，如果设置的绝缘材料为柔性材料，例如柔性塑料或橡胶，还可以进一步起到保护LED芯片和LED灯条的作用，避免背光单元在受到外力挤压时，造成灯条的损害。
此外，上述实施例以LED灯条作为示例描述了背光单元的光源，但根据本发明的实施例不限于LED灯条。根据本发明实施例的背光单元可以为任意合适的光源，例如，可以是冷阴极射线管(CCFL)光源。例如，根据本发明实施例的背光单元的光源包括条状基底以及设置在条状基底上的发光部。该发光部可以包括沿所述条状基底的延伸方向间隔排列的多个子发光部。例如，每个子发光部可以为LED芯片。
根据上述实施例所述，背板的主体部包括第一主表面和第二主表面，但这并不限制于第一主表面和第二主表面是严格的平面。例如，在上述主体部包括台阶结构的情况下，上述主表面不是严格的平面，但由于台阶结构的高度很小，主体部的主表面也可以为大致平坦的表面。在有台阶结构的情况下， 平行于或垂直于第一主表面的方向可以为分别平行于或垂直于被台阶结构分成的第一部分和第二部分的主表面。例如，主体部的第一部分和第二部分彼此平行。
另外需要说明的是，根据本发明实施例的背光单元的背板可以采用根据本发明实施例的背板，根据本发明实施例的背板也可以应用于根据本发明实施例的背光单元。因此，不同实施例中关于背板的描述可以彼此结合或替换。
对于本发明实施例中背光单元的导光板，其可以是具有导光功能的任何部件。例如，其也可以包括在单一导光板上形成扩散层、反射层、散射层等各种功能层的结构。
如上所述，根据本发明实施例的背板可以不设置所述延伸部，因此，根据本发明实施例的背光单元中的背板也可以不设置延伸部。在这种情况下，导光板的端部无法通过背板的“U”型结构来固定，但可以通过其他任意合适的方式，例如粘贴，来固定到背板上。
另外，需要说明的是，上面以镂空结构设置在背板的主体部的第一边缘附近为例进行了描述，然而，这里的“第一边缘”并不仅仅限于图中所示的第一边缘11。例如，当背板的主体部为矩形的情况下，第一边缘可以是矩形的其中一个边、两个边、三个边或四个边，例如，可以是矩形的两个相对的边。也就是说，主体部的“第一边缘”可以是主体部的全部边缘的至少一部分。
本发明的再一个方面提供了一种显示装置，包括如上所述背光单元。
本发明的又一个方面提供了一种包括本发明实施例提供的背板的背光单元的组装方法，包括：
提供导光板及LED灯条；
将所述导光板设置于所述背板的第一主表面侧，使得所述导光板的入光面设置在所述延伸部的第二部分与所述主体部之间，
将所述LED灯条设置于所述背板的主体部的第二主表面侧，且将所述灯条的LED芯片穿过所述镂空结构，以使所述LED芯片的出光面与所述导光板的入光面彼此面对。
例如，背光单元的组装方法例如包括如下步骤：参照图2，提供具有延伸部的背板，并将背板靠近延伸部的部分设置为镂空结构，即本发明实施例提供的背板结构。如上所述，例如，该镂空结构包括沿主体部的第一边缘延 伸的条形结构，以及从条形结构向第一边缘突出且沿平行于第一边缘的方向间隔排列的多个突出结构。延伸部的设置例如可以是将基本为平面结构的背板进行二次弯折，例如也可以是通过膜具一体成型或者是平面结构的背板与U折结构彼此固定连接而成。镂空结构例如是通过机械加工的方式获得，例如切削、刨洗等方法。继续参照图2，例如，如上所述，还可以将主体部靠近第一边缘的部分设置为台阶结构，即主体部的沿第一边缘的部分包括台阶结构，台阶结构包括朝向延伸部的第二部分弯折的弯折部以及连接弯折部的靠近第二部分的边缘与第一边缘的连接部，且镂空结构位于弯折部以及连接部靠近所述弯折部的部分。例如，台阶结构的弯折部在主体部厚度方向上的尺寸例如可以是与灯条的厚度相同。例如，台阶结构、镂空结构以及延伸部可以匹配制备。例如，首先将一块具有平面结构的金属板的边缘弯折形成延伸部；随后，在背板的距离延伸部一定距离的位置使背板两次弯曲，以形成与延伸部基本平行的台阶；最后，使背板从其台阶的中间位置向靠近延伸部一侧镂空，获得所需的背板结构。
参照图4b，LED芯片41例如是通过焊接的方式焊接于灯条4。参照图4a，将灯条4从背板的第二主表面侧(与设置有导光板的侧相反侧)贴敷于背板，LED芯片对应的镶嵌到镂空结构的各个突出结构中。
参照图4c，将导光板设置于背板的第一主表面侧，并且导光板的出光面与LED芯片的入光面彼此相对设置。
需要说明的是，灯条贴敷以及导光板的设置的顺序不做具体要求，可以根据实际情况自行选择。只要保证灯条上的LED芯片穿过镂空结构后出光面与背板第一主表面侧设置的导光板的入光面彼此面对即可。另外，前文所述有关背板及背光单元的各种形状、尺寸等变形及各种变形的组合，该背光单元的组装方法中均可采用，并能产生类似的技术效果，参照之前的描述。
在完成上述导光板、LED灯条的设置后，还可以进一步设置反射片、扩散片和增亮膜等。
在一个实施例中，使所述LED灯条的基底在基底宽度方向上位于LED芯片两侧的部分例如分别粘接于背板的第二主表面以及导光板的靠近所述第一主表面且露出镂空结构的部分表面。通过使灯条的基底在宽度方向上位于LED芯片的两侧分别贴敷于背板第二主表面以及导光板的部分表面，可以提 高灯条贴敷的稳定性，避免灯条在受到外力时发生扭曲变形。
在一个实施例中，在所述背板第一侧设置导光板的方法为：在所述背板的第一主表面侧设置定位线，按照所述定位线将所述导光板安装到位。通过设置定位线，可以更加方便准确的将导光板安装到位，提高组装效率。
在所述背板第一主表面侧固定所述导光板的方法例如为：将导光板的远离延伸部一侧与背板的第一主表面彼此粘接；LED灯条的固定方法例如为通过双面胶带粘贴于例如背板的第二主表面。
在本文中，诸如“第一”、“第二”等术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不要求或者暗示这些实体或操作之间存在任何关系或者顺序。术语“包括”、“包含”这些表述为开放式的，并不排除所包括的过程、方法、物品，还存在其他要素。还需要说明的是，“上”、“下”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发明和简化描述，而不是指示或暗示所指的装置或元件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发明的限制。除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
以上所述仅是本发明的示范性实施方式，而非用于限制本发明的保护范围，本发明的保护范围由所附的权利要求确定。
本申请要求于2016年4月27日递交的中国专利申请第201610281018.2号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (20)

  1. 一种背光单元，包括：
    背板，包括主体部，所述主体部具有彼此相对的第一主表面和第二主表面，且所述主体部设置有镂空结构；
    光源，从所述主体部的第二主表面侧穿过所述镂空结构，且所述光源的发光部在所述主体部的第一主表面侧露出；
    导光板，设置于所述背板的主体部的第一主表面侧，
    其中，所述光源的发光部包括出光面，且所述出光面面对所述导光板的入光面。
  2. 根据权利要求1所述的背光单元，其中，所述导光板的入光面为所述导光板的至少一个侧面。
  3. 根据权利要求1或2所述的背光单元，其中，所述光源包括条状基底以及设置在所述条状基底上的发光部，所述条状基底位于所述主体部的第二主表面侧，所述发光部穿过所述镂空结构以使所述出光面在所述主体部的第一主表面侧露出。
  4. 根据权利要求3所述的背光单元，其中，所述光源的发光部的出光面位于所述发光部面对所述导光板的入光面的侧面。
  5. 根据权利要求1-4任一项所述的背光单元，其中，所述镂空结构设置在所述主体部的靠近其第一边缘的部分，所述背板还包括从所述主体部的所述第一边缘向所述第一主表面侧弯折的第一弯折部，以及从所述第一弯折部的远离所述主体部的边缘向所述主体部的中部弯折的第二弯折部，所述第二弯折部与所述主体部彼此间隔且在垂直于所述第一主表面的方向上至少部分重叠。
  6. 根据权利要求5所述的背光单元，其中，所述导光板的设置入光面的端部位于所述第二弯折部与所述主体部之间。
  7. 根据权利要求5所述的背光单元，其中，所述镂空结构平行于所述第一边缘延伸，所述主体部的靠近所述第一边缘的部分包括台阶结构以使所述主体部分成在垂直所述第一主表面的方向上错开的第一部分和第二部分，所述镂空结构位于所述第一部分中。
  8. 根据权利要求7所述的背光单元，其中，所述主体部的第一部分和第二部分在垂直所述第一主表面的方向上的间距与所述光源的条状基底的厚度大致相同。
  9. 根据权利要求5所述的背光单元，其中，在平行于所述主体部的第一主表面的平面图中看，所述镂空结构包括沿所述主体部的第一边缘延伸的条形结构，以及从所述条形结构向所述第一边缘突出且沿平行于所述第一边缘的方向间隔排列的多个突出结构。
  10. 根据权利要求9所述的背光单元，其中，所述光源的发光部包括沿所述条状基底的延伸方向间隔排列的多个子发光部，所述多个子发光部分别嵌入所述镂空结构的所述多个突出结构中。
  11. 根据权利要求5所述的背光单元，其中，所述光源的条状基底沿平行于所述第一边缘的方向上延伸超出所述镂空结构的部分被固定到所述主体部的第二主表面上。
  12. 根据权利要求5所述的背光单元，其中，所述第一弯折部与所述第一主表面垂直，所述第二弯折部与所述第一主表面平行。
  13. 一种包括如权利要求1-12任一项所述背光单元的显示装置。
  14. 一种如权利要求1-12任一项所述的背光单元的组装方法，包括：
    提供所述背板、所述光源以及所述导光板；
    将所述导光板设置于所述背板的第一主表面侧，
    将所述光源从所述背板的主体部的第二主表面侧贯穿所述镂空结构，以使所述光源的发光部在所述主体部的第一主表面侧露出，且所述发光部的出光面面对所述导光板的入光面。
  15. 一种用于背光单元的背板，包括主体部，所述主体部具有彼此相对的第一主表面和第二主表面，
    其中，所述主体部设置有镂空结构，所述镂空结构用于所述背光单元的光源从所述主体部的第二主表面侧穿过所述镂空结构，且所述光源的发光部在所述主体部的第一主表面侧露出。
  16. 根据权利要求15所述的背板，其中，所述镂空结构设置在所述主体部的靠近其第一边缘的部分，所述背板还包括从所述主体部的所述第一边缘向所述第一主表面侧弯折的第一弯折部，以及从所述第一弯折部的远离所述 主体部的边缘向所述主体部的中部弯折的第二弯折部，所述第二弯折部与所述主体部彼此间隔且在垂直于所述第一主表面的方向上至少部分重叠。
  17. 根据权利要求16所述的背板，其中，所述第一弯折部与所述第一主表面垂直，所述第二弯折部与所述第一主表面平行。
  18. 根据权利要求16或17所述的背板，其中，所述镂空结构平行于所述第一边缘延伸，所述主体部的靠近所述第一边缘的部分包括台阶结构以使所述主体部分成在垂直所述第一主表面的方向上错开的第一部分和第二部分，所述镂空结构位于所述第一部分中。
  19. 根据权利要求18所述的背板，其中，所述背板在所述镂空结构的延伸方向的两侧分别包括未镂空的部分。
  20. 根据权利要求16-19任一项所述的背板，其中，在平行于所述主体部的第一主表面的平面图中看，所述镂空结构包括沿所述主体部的第一边缘延伸的条形结构，以及从所述条形结构向所述第一边缘突出且沿平行于所述第一边缘的方向间隔排列的多个突出结构。
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