KR20110115739A - Back light unit and display apparatus - Google Patents

Back light unit and display apparatus Download PDF

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Publication number
KR20110115739A
KR20110115739A KR1020100035238A KR20100035238A KR20110115739A KR 20110115739 A KR20110115739 A KR 20110115739A KR 1020100035238 A KR1020100035238 A KR 1020100035238A KR 20100035238 A KR20100035238 A KR 20100035238A KR 20110115739 A KR20110115739 A KR 20110115739A
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KR
South Korea
Prior art keywords
light
light source
resin layer
disposed
diffusion plate
Prior art date
Application number
KR1020100035238A
Other languages
Korean (ko)
Inventor
정찬성
허훈
Original Assignee
엘지전자 주식회사
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Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020100035238A priority Critical patent/KR20110115739A/en
Priority to PCT/KR2010/005435 priority patent/WO2011025175A2/en
Priority to EP10812189.8A priority patent/EP2470952B1/en
Priority to US12/860,704 priority patent/US8511845B2/en
Publication of KR20110115739A publication Critical patent/KR20110115739A/en

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    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention relates to a backlight unit and a display device.
The backlight unit according to the present invention includes a substrate, a light source disposed on the substrate, a resin layer disposed on an upper portion of the substrate on which the light source is disposed, and a diffusion plate disposed on an upper portion of the resin layer. The light shielding portion may be printed, and the diffusion plate may be disposed in a direction in which one surface on which the light shielding portion is printed faces the resin layer.

Description

Back Light Unit and Display Apparatus

The present invention relates to a backlight unit and a display device.

As the information society develops, the demand for display devices is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display panels (PDPs), electro luminescent displays (ELDs), and vacuum fluorescents (VFDs) have been developed. Various display devices such as displays have been researched and used. Among them, the liquid crystal panel of the LCD includes a TFT substrate and a color filter substrate facing each other with the liquid crystal layer and the liquid crystal layer interposed therebetween, and can display an image using light provided from the backlight unit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a backlight unit and a display device for improving optical stability while improving structural stability.

The backlight unit according to the present invention includes a substrate, a light source disposed on the substrate, a resin layer disposed on an upper portion of the substrate on which the light source is disposed, and a diffusion plate disposed on an upper portion of the resin layer. The light shielding portion may be printed, and the diffusion plate may be disposed in a direction in which one surface on which the light shielding portion is printed faces the resin layer.

In addition, the light blocking unit may be formed at a position corresponding to the light source.

In addition, the resin layer may be provided with a depression recessed in the direction toward the substrate, and the light blocking portion may be located in the depression.

In addition, an air layer may be formed between the diffusion plate and the resin layer.

In addition, an adhesive layer may be formed between the diffusion plate and the resin layer.

In addition, the light blocking part and the resin layer may contact.

In addition, the light blocking part may include titanium dioxide (TiO 2 ) material.

In addition, an optical sheet may be attached to the other surface of the diffusion plate.

In addition, the light blocking part may include a portion of which thickness decreases away from the light source.

In addition, the light blocking part may include a portion in which transparency increases as the distance from the light source increases.

The light blocking part may include a plurality of dots, and may include a portion in which the density of the dots decreases as the distance from the light source increases.

In addition, a plurality of holes may be formed in the light blocking part, and may include a portion in which the size of the hole increases as the distance from the light source increases.

In addition, when the light emitting surface faces the direction parallel to the substrate and the light emitting surface faces the front side of the light source, a portion where the light blocking portion is not formed may be located on the rear surface of the light source.

Further, another backlight unit according to the present invention includes a substrate, a light source disposed on the substrate, a resin layer disposed on an upper portion of the substrate on which the light source is disposed, and a diffusion plate disposed on the resin layer, and the diffusion A plurality of protrusions may be formed on one surface of the plate, and a light shielding portion may be printed on an upper portion of the protrusion.

In addition, the diffusion plate may be disposed in a direction in which one surface of the light shielding portion is printed toward the resin layer.

In addition, the protrusion may have a pyramid shape.

In addition, the display apparatus according to the present invention includes a display panel and a backlight unit attached to a rear surface of the display panel, wherein the backlight unit is disposed on a substrate, a light source disposed on the substrate, and a substrate on which the light source is disposed. And a diffusion plate disposed on the resin layer and the resin layer, wherein a light shielding portion is printed on one surface of the diffusion plate, and the diffusion plate may be disposed in a direction toward which the light shielding portion is printed toward the resin layer. .

In addition, another display apparatus according to the present invention includes a display panel and a backlight unit attached to a rear surface of the display panel, wherein the backlight unit is disposed on a substrate, a light source disposed on the substrate, and a substrate on which the light source is disposed. It includes a resin layer disposed and a diffusion plate disposed on the resin layer, a plurality of protrusions are formed on one surface of the diffusion plate, the light shielding portion may be printed on the upper portion of the protrusion.

The backlight unit and the display apparatus according to the present invention can facilitate the manufacturing process, improve the structural stability, and improve the optical properties by printing the light shielding portion on the diffusion plate, and placing it on the upper portion of the resin layer .

1 is an exploded perspective view showing the configuration of a display device;
2 is a schematic cross-sectional view of a display device according to an embodiment of the present invention;
3 is a cross-sectional view of the backlight unit;
4 is a cross-sectional view of another configuration of the backlight unit;
5 to 7 are views for explaining the direct method;
8 to 21 are views for explaining the diffusion plate;
22 to 30 are views for explaining in detail the light shield;
31 to 35 are views for explaining the arrangement of the light sources of the backlight unit according to the embodiment of the present invention;
36 is a diagram for explaining a unit substrate structure; And
37 is a cross-sectional view illustrating a configuration of a display apparatus according to an exemplary embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. It is to be understood that the present invention is not intended to be limited to the specific embodiments but includes all changes, equivalents, and alternatives falling within the spirit and scope of the present invention.

In describing the present invention, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. The terms may be used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The term and / or may include a combination of a plurality of related items or any item of a plurality of related items.

When an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between Can be understood. On the other hand, when it is mentioned that an element is "directly connected" or "directly connected" to another element, it can be understood that no other element exists in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. The singular expressions may include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used interchangeably to designate one or more of the features, numbers, steps, operations, elements, components, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries can be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are, unless expressly defined in the present application, interpreted in an ideal or overly formal sense .

In addition, the following embodiments are provided to explain more fully to the average person skilled in the art. The shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

1 is an exploded perspective view illustrating a configuration of a display device.

Referring to FIG. 1, the display device 1 may include a front cover 30, a rear cover 40, and a display module 20 disposed between the front cover 30 and the rear cover 40. .

The front cover 30 may be disposed to surround the display module 20, and may include a front panel (not shown) of a substantially transparent material capable of transmitting light. Here, the front panel may be disposed on the front surface of the display module 20 at regular intervals to protect the display module 20 from external impact.

2 is a schematic cross-sectional view of a display apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the display module 20 included in the display device may include a display panel 100 and a backlight unit 200.

The display panel 100 may include a color filter substrate 110 and a thin film transistor (TFT) substrate 120 bonded to face each other to maintain a uniform cell gap. In addition, a liquid crystal layer (not shown) may be disposed between the color filter substrate 110 and the TFT substrate 120.

The color filter substrate 110 includes a plurality of pixels including red (R), green (G), and blue (B) sub-pixels, and generates an image corresponding to the color of red, green, or blue when light is applied. You can.

The pixels may include red, green, and blue subpixels, but the red, green, blue, and white (W) subpixels constitute one pixel, but are not necessarily limited thereto, and may be configured in various combinations.

The TFT substrate 120 may switch a pixel electrode (not shown) as a switching element.

The liquid crystal layer is composed of a plurality of liquid crystal molecules, and the liquid crystal molecules may change an arrangement corresponding to a voltage difference generated between a pixel electrode and a common electrode, which are not shown. Accordingly, the liquid crystal molecules may be provided from the backlight unit 200. Light may be incident on the color filter substrate 110 in response to a change in the molecular arrangement of the liquid crystal layer.

An upper polarizer 130 and a lower polarizer 140 may be disposed on upper and lower sides of the display panel 100, and more specifically, an upper polarizer 130 is formed on an upper surface of the color filter substrate 110. The lower flat plate 140 may be formed on the lower surface of the TFT substrate 120.

Side of the display panel 100 may be provided with a gate and a data driver (not shown) for generating a driving signal for driving the panel 100.

The structure and configuration of the display panel 100 as described above is merely an example, and the embodiments may be changed, added, or deleted within the scope of the spirit of the present invention.

As shown in FIG. 2, the display apparatus according to the exemplary embodiment of the present invention may be configured by closely placing the backlight unit 200 on the display panel 100. For example, the backlight unit 200 may be attached to and fixed to the lower side of the display panel 100, more specifically, the lower polarizer 140, and for this purpose, between the lower polarizer 140 and the backlight unit 200. An adhesive layer (not shown) may be formed on the substrate.

By forming the backlight unit 200 in close contact with the display panel 100 as described above, the overall thickness of the display device may be reduced to improve appearance, and the display device may be removed by removing a structure for fixing the backlight unit 200. Can simplify the structure and manufacturing process. In addition, by reducing the space between the backlight unit 200 and the display panel 100, it is possible to prevent the malfunction of the display device due to the insertion of foreign matters into the space or the degradation of the image quality of the display image.

According to an exemplary embodiment of the present invention, the backlight unit 200 may be configured in a form of a plurality of functional layers stacked, and at least one of the plurality of functional layers may include a plurality of light sources (not shown). Can be.

In addition, as described above, in order for the backlight unit 200 to be closely fixed to the lower surface of the display panel 100, the plurality of layers constituting the backlight unit 200, more specifically, the backlight unit 200 may be provided. It is preferable that it is comprised from the material which has ductility, respectively.

In addition, a bottom cover (not shown) on which the backlight unit 200 is seated may be provided below the backlight unit 200.

According to an exemplary embodiment of the present invention, the display panel 100 may be divided into a plurality of areas, and the display panel 100 may be divided from areas of the backlight unit 200 corresponding to gray peak values or color coordinate signals of each of the divided areas. The brightness of the emitted light, that is, the brightness of the corresponding light source, may be adjusted to adjust the brightness of the display panel 100.

To this end, the backlight unit 200 may be divided into a plurality of divided driving regions corresponding to each of the divided regions of the display panel 100.

3 is a cross-sectional view of the backlight unit.

Referring to FIG. 3, the backlight unit 200 may include a substrate 210, a light source 220, a resin layer 230, and a reflective layer 240.

The plurality of light sources 220 may be formed on the substrate 210, and the resin layer 230 may be formed on the substrate 210 to surround the plurality of light sources 220.

Although not illustrated, an electrode pattern (not shown) for connecting the connector (not shown) and the light source 220 may be formed on the substrate 210. For example, a carbon nanotube electrode pattern (not shown) may be formed on the upper surface of the substrate 210 to connect the light source 220 and the connector. The connector may be electrically connected to a power supply unit (not shown) that supplies power to the light source 220.

The substrate 210 may be a printed circuit board (PCB) including materials such as polyethylene terephthalate, glass, polycarbonate and silicon. In addition, the substrate 210 may be a film substrate.

The light source 220 may be one of a light emitting diode (LED) chip or a light emitting diode package having at least one light emitting diode chip. In this embodiment, a light emitting diode package is provided as the light source 220.

The light source 220 may be a colored LED or a white LED emitting at least one of colors such as red, blue, and green. In addition, the colored LED may include at least one of a red LED, a blue LED, and a green LED, and the arrangement and emission light of the light emitting diode may be changed within the technical scope of the embodiment.

On the other hand, the resin layer 230 disposed on the upper side of the substrate 210 transmits and diffuses the light emitted from the light source 220, and the light emitted from the light source 220 is uniformly distributed to the display panel 100. Can be provided.

A reflective layer 240 reflecting light emitted from the light source 220 may be formed between the substrate 210 and the resin layer 230, more specifically, on the upper surface of the substrate 210.

The reflective layer 240 may reflect the light totally reflected from the boundary of the resin layer 230 so that the light emitted from the light source 220 may be diffused more widely.

The reflective layer 240 may include a white pigment such as titanium oxide dispersed in a sheet of synthetic resin, a metal deposition film laminated on the surface, or a bubble dispersed to scatter light in a synthetic resin sheet. In order to increase the reflectance, silver (Ag) may be coated on the surface. Alternatively, the reflective layer 240 may be formed by coating the upper surface of the substrate 210.

The resin layer 230 may be made of various resins having light transmittance. For example, the resin layer 230 may include any one material or at least two materials selected from the group consisting of polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene, polyepoxy, silicone, acrylic, and the like. Do.

In addition, in order for the light emitted from the light source 220 to be diffused so that the backlight unit 200 has uniform luminance, the refractive index of the resin layer 230 may be about 1.4 to 1.6.

The resin layer 230 may include a polymer resin having adhesiveness so as to be in close contact with the light source 220 and the reflective layer 240. For example, the second layer 230 may be unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, Hydroxy ethyl methacrylate, hydroxy propyl methacrylate, hydroxy ethyl acrylate, acrylamide, metyrol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2 -Acryl-based, urethane-based, epoxy-based, melamine-based, and the like, such as ethyl hexyl acrylate polymer or copolymer or terpolymer.

The resin layer 230 may be formed by applying a resin on a liquid or gel to the upper surface of the substrate 210 on which the plurality of light sources 220 and the reflective layer 240 are formed, and then curing the resin. It is also possible to be formed separately and bonded to the upper surface of the substrate 210.

As the thickness a of the resin layer 230 increases, the light emitted from the light source 200 may be spread more widely, and light of uniform brightness may be provided from the backlight unit 200 to the display panel 100. On the other hand, as the thickness a of the second layer 230 increases, the amount of light absorbed by the second layer 230 may increase, thereby providing the display panel 100 from the backlight unit 200. The brightness of the light may be reduced overall.

Therefore, in order to provide light of uniform brightness without greatly reducing the brightness of the light provided from the backlight unit 200 to the display panel 100, the thickness a of the resin layer 230 may be 0.1 to 4.5 mm. desirable.

4 is a cross-sectional view of another configuration of the backlight unit. Hereinafter, the description of the parts described in detail with reference to FIG. 3 will be omitted.

Referring to FIG. 4, a plurality of light sources 220 may be mounted on the substrate 210, and the resin layer 230 may be disposed on the substrate 210. Meanwhile, a reflective layer 240 may be formed between the substrate 210 and the resin layer 230.

In addition, the resin layer 230 may include a plurality of scattering particles 231, and the scattering particles 231 scatter or refract incident light so that light emitted from the light source 220 may be diffused more widely. can do.

The scattering particles 231 may be formed of a material having a refractive index different from that of the material of the resin layer 230, and more particularly of the silicon of the resin layer 230 in order to scatter or refract light emitted from the light source 220. Or it may be made of a material having a higher refractive index than the acrylic resin.

For example, the scattering particles 231 may be polymethyl methacrylate / styrene copolymer (MS), polymethyl methacrylate (PMMA), polystyrene (PS), silicon, titanium dioxide (TiO2), silicon dioxide (SiO2). ), Or a combination of the above materials.

On the other hand, the scattering particles 231 may be made of a material having a lower refractive index than the material constituting the resin layer 230, for example, may be formed by forming a bubble in the resin layer (230). .

In addition, the material constituting the scattering particles 231 is not limited to the above materials, and may be formed using various polymer materials or inorganic particles.

According to the exemplary embodiment of the present invention, the resin layer 230 is a substrate 210 in which a plurality of light sources 220 and a reflective layer 240 are formed after mixing the scattering particles 231 in a liquid or gel resin. It may be formed by applying to the upper surface of the) and then curing.

The LED package constituting the light source 220 in the direct method may be divided into a top view method and a side view method according to a direction in which the light emitting surface is directed. This is described below.

5 to 7 are views for explaining the direct method.

FIG. 5 is a view illustrating a top view method of the direct method.

Referring to FIG. 5, the light emitting surfaces of the plurality of light sources 220 provided in the backlight unit 200 are disposed on an upper surface thereof, respectively, in a direction perpendicular to the upper direction, for example, the substrate 210 or the reflective layer 240. It can emit light.

FIG. 6 illustrates a side view of the direct method.

Referring to FIG. 6, each of the light sources 220 provided in the backlight unit 200 has a light emitting surface disposed on a side thereof, and emits light in a lateral direction, that is, in a direction parallel to the substrate 210 or the reflective layer 240. can do. For example, the plurality of light sources 220 may be configured using a side view LED package, thereby reducing the problem that the light source 220 is observed as a hot spot on the screen. In addition, the thickness (a) of the resin layer 230 may be reduced to reduce the thickness of the backlight unit 200 and further, the display device.

Referring to FIG. 7, a pattern may be formed in the reflective layer 240 to facilitate propagation of light emitted from the light source 220 to the adjacent light source 225.

The pattern formed on the upper surface of the reflective layer 240 may include a plurality of protrusions 241, and the light incident on the plurality of protrusions 241 after being emitted from the light source 220 is scattered in the advancing direction. Can be refracted.

On the other hand, as shown in Figure 7, the density of the protrusions 241 formed in the reflective layer 240 may increase as the distance from the light source 220. Accordingly, it is possible to prevent the luminance of light emitted upward from the region far from the light source 220 to be reduced, thereby maintaining the luminance of the light provided from the backlight unit 200 uniformly.

In addition, the protrusions 241 may be formed of the same material as the reflective layer 240, and in this case, the protrusions 241 may be formed by processing an upper surface of the reflective layer 240.

Alternatively, the protrusions 241 may be formed of a material different from that of the reflective layer 240, and may be formed by printing a pattern as shown in FIG. 7 on the upper surface of the reflective layer 240.

The shape of the protrusions 241 is not limited to that shown in FIG. 7, and may be various shapes such as, for example, a prism.

8 to 21 are diagrams for explaining the diffusion plate. Hereinafter, the description of the parts described in detail above will be omitted. For example, description of a reflection pattern etc. is abbreviate | omitted.

Referring to FIG. 8, a diffusion plate 1800 may be disposed on the resin layer 230. In addition, the light blocking unit 260 may be printed on one surface of the diffusion plate 1800. Here, one surface of the diffusion plate 1800 on which the light shielding portion 260 is printed may be disposed to face the resin layer 230.

Since the diffusion plate 1800 has a rigid plate shape, the diffusion plate 1800 may serve as a support for other functional layers, and may diffuse light incident from the light source 220.

Although not shown, the diffusion plate 1800 may include a plurality of beads, and scatter the light incident by using the beads to prevent the light from being concentrated at a specific portion.

The diffusion plate 1800 may include a material such as polycarbonate (PC), polymethylmethacrylate (PMMA), or cyclic olefin copolymer (COC).

The light blocking unit 260 may be formed at a position corresponding to the light source 220 in the diffusion plate 1800. The light blocking unit 260 may prevent the light emitted from the light source 220 from being concentrated in a specific area.

The light blocking unit 260 may transmit a part of light incident from the light source 220 and reflect a part of the light. To this end, the light blocking portion 260 may include titanium dioxide (TiO 2 ) material. In this case, the color of the light blocking part 260 may be substantially white, and thus may reflect a part of the incident light more effectively while transmitting a part of the incident light.

Looking at the manufacturing method of the backlight unit having the above structure as follows.

First, as shown in FIG. 9A, a light blocking part 260 having a predetermined pattern may be printed on one surface of the diffusion plate 1800. For example, a light shielding ink is prepared by mixing a titanium dioxide (TiO 2 ) material and a solvent, and the manufactured light shielding ink is directly printed on the surface of the diffusion plate 1800, and then the printed light shielding ink is dried to predetermined light shielding. Patterns can be formed.

Thereafter, as shown in FIG. 9B, the diffusion plate 1800 on which the light blocking portion 260 is printed may be positioned on the resin layer 230. Here, it may be preferable to position the diffuser plate 1800 such that the light blocking portion 260 corresponds to the light source 220. That is, the alignment of the light blocking portion 260 and the light source 220 is aligned.

Thereafter, as shown in FIG. 9C, the diffusion plate 1800 having the light blocking portion 260 may be attached to the resin layer 230. Here, since the light blocking portion 260 has a predetermined height, the light blocking portion 260 has a shape protruding from the diffusion plate 1800, and the light blocking portion 260 may contact the resin layer 230. have. That is, the light blocking part 260 may contact the resin layer 230 so that the diffusion plate 1800 may be firmly fixed to the resin layer 230.

Here, when the resin layer 230 includes a resin material having adhesiveness, the diffusion plate 1800 may be firmly attached to the resin layer 230 without using an adhesive. Accordingly, structural stability can be sufficiently secured without additionally using an adhesive.

In addition, since the light blocking part 260 has a predetermined height, an air layer 900 may be formed between the diffusion plate 1800 and the resin layer 230. That is, when the diffusion plate 1800 in the form of a rigid plate is disposed on the upper portion of the resin layer 230, and the light blocking portion 260 has a predetermined height, the air is formed between the resin layer 230 and the diffusion plate 1800. Layer 900 can be formed.

The air layer 900 has a refractive index of 1, which may be different from that of the resin layer 230 and that of the diffusion plate 1800. Accordingly, the formation of the air layer 900 may result in the formation of another layer having a different refractive index, that is, the air layer 900, between the resin layer 230 and the diffusion plate 1800, and thus, the light source. The light emitted by 220 may be diffused more effectively.

In addition, as shown in FIG. 9, after the light blocking portion 260 is formed in the diffusion plate 1800, the diffusion plate 1800 having the light blocking portion 260 is disposed on the resin layer 230. In this case, the light blocking part 260 may contact the resin layer 230 so that the diffusion plate 1800 may be firmly fixed to the resin layer 230 without using an additional adhesive. Thereby, it is possible to reduce manufacturing cost while improving structural stability.

In addition, since the light blocking portion 260 may be formed on the diffusion plate 1800 separately from the process of forming the resin layer 230 on the substrate 210, the time required for the manufacturing process may be reduced.

In addition, after the light shield 260 is printed on the diffusion plate 1800, the diffusion plate 1800 is disposed on the resin layer 230, so that the diffusion plate 1800 and the light shield 260 collide with each other. 260 can be prevented from being damaged.

In addition, the alignment plate is aligned so that the light blocking portion 260 is positioned at a position corresponding to the light source 220, and only the diffusion plate 1800 having the light blocking portion 260 is disposed on the resin layer 230. In addition, since the light shielding part 260 can be aligned with the light source 220, even if the precision of a manufacturing process is low, it does not matter. Accordingly, manufacturing cost and time required for the manufacturing process can be further reduced.

On the other hand, when the diffusion plate 1800 on which the light shielding portion 260 is formed is disposed on the upper portion of the resin layer 230, pressure is applied to the diffusion plate 1800 so that the light shielding portion 260 is stronger than the resin layer 230. Can be attached. In this case, as shown in FIG. 10, the light blocking portion 260 may enter the resin layer 230 to a predetermined depth.

In other words, the recessed part 1000 recessed in the direction toward the substrate 210 may be formed in the resin layer 230, and the light blocking part 260 may be located in the recessed part 1000. In this case, the diffusion plate 1800 may be more firmly fixed to the resin layer 230.

Alternatively, as shown in FIG. 11, the optical sheet 250 may be disposed on the diffusion plate 1800. For example, the optical sheet 250 may include a prism sheet 251 and a diffusion sheet 252. In this case, the plurality of sheets included in the optical sheet 250 may be adhered or adhered without being spaced apart from each other. Accordingly, the thickness of the backlight unit can be reduced.

Meanwhile, the lower surface of the optical sheet 250 may be in close contact with the diffusion plate 1800, and the upper surface of the optical sheet 250 may be in close contact with the lower surface of the display panel, more specifically, the lower polarizer, although not shown. have. This lower polarizer has been described above with reference to FIG. 2.

The diffusion sheet 252 diffuses the incident light to prevent the light emitted from the diffusion plate 1800 from being partially concentrated, thereby making the brightness of the light uniform. In addition, the prism sheet 251 may collect light emitted from the diffusion sheet 252 to allow light to enter the display panel 100 vertically.

According to another embodiment of the present invention, the optical sheet 250 as described above, for example, at least one of the prism sheet 251 and the diffusion sheet 252 may be removed, or the prism sheet 251 and In addition to the diffusion sheet 252 may be configured to further include a variety of functional layers.

Alternatively, as shown in FIG. 12, an adhesive layer 1200 may be formed between the diffusion plate 1800 and the resin layer 230. In this case, it is possible to further improve structural stability by improving the adhesion between the diffusion plate 1800 and the resin layer 230.

As such, when the adhesive layer 1200 is formed between the diffusion plate 1800 and the resin layer 230, the amount of the adhesive may be reduced because the resin layer 230 and the light blocking part 260 may contact each other. Thereby, excessive rise of a manufacturing cost can be suppressed.

In addition, in order to obtain an effect similar to that of forming the air layer 900 between the diffusion plate 1800 and the resin layer 230, the refractive index of the adhesive layer 1200 may be smaller than the refractive index of the resin layer 230. Can be.

Alternatively, the refractive index of the adhesive layer 1200 is larger than the refractive index of the resin layer 230 in order to reflect light incident on the adhesive layer 1200 and to reflect the light again by the reflective layer 240 to facilitate the diffusion of light. It may be desirable.

In addition, the adhesive layer 1200 may be formed between the light blocking portion 260 and the resin layer 230. In this case, the thickness of the adhesive layer 1200 at a position corresponding to the light source 220 may be thinner than the thickness of the adhesive layer 1200 at a position corresponding to a region between two adjacent light sources 220.

Alternatively, as illustrated in FIG. 13, the light blocking portion 260 and the resin layer 230 may directly contact each other, and an adhesive layer 1200 may be formed in an area between adjacent light blocking portions 260. That is, the adhesive layer 1200 may not be formed between the light blocking portion 260 and the resin layer 230.

Referring to FIG. 14, a plurality of protrusions 1810 may be formed on one surface of the diffusion plate 1800, and a light blocking portion 260 may be formed on the protrusions 1810. In detail, the protrusion 1810 may have a pyramid shape.

In addition, the protrusion 1810 may be disposed to face the resin layer 230. From the standpoint of the resin layer 230, the protrusion 1810 has an inverted pyramid shape.

When light is incident from the resin layer 230, the light is reflected from the inclined surface of the protrusion 1810, thereby spreading the light more widely. For example, as in the case of FIG. 15, when light is incident through the A path, light incident on the surface of the specific protrusion 1810 may be reflected. The reflected light may be incident at a relatively large angle to other adjacent protrusions 1810, and thus may pass through the other protrusions 1810 and enter the diffuser plate 1800. Light incident on the B path goes through a similar process. As such, the protrusion 1810 may diffuse the light incident from the resin layer 230 more widely, thereby improving the light diffusion effect.

Although only the case where the shape of the protrusion part 1810 is a pyramid shape is shown here, as long as it is a structure which can diffuse the light incident from the resin layer 230, any structure is possible.

Alternatively, as shown in FIG. 16, the auxiliary layer 1600 having the light blocking portion 260 may be disposed between the diffusion plate 1800 and the resin layer 230.

In this configuration, the light shielding part 260 is formed on the auxiliary layer 1600, and then the auxiliary layer 1600 having the light blocking part 260 is disposed between the diffusion plate 1800 and the resin layer 230. The method can be applied.

The auxiliary layer 1600 may be made of a material having the same refractive index as that of the material constituting the resin layer 230, or may be made of a material having a different refractive index.

For example, when the auxiliary layer 1600 is made of a material having a refractive index higher than that of the resin layer 230, the light emitted from the resin layer 230 may be diffused more widely.

Unlike this, when the auxiliary layer 1600 is formed of a material having a lower refractive index than the resin layer 230, the reflectance of the light emitted from the resin layer 230 may be reflected on the bottom surface of the auxiliary layer 1600. Therefore, the light emitted from the light source 220 can be made easier to travel along the resin layer 230.

In addition, the auxiliary layer 1600 may include a plurality of scattering particles, that is, beads, in which case the density of the beads included in the auxiliary layer 1600 may be higher than the density of the beads included in the resin layer 230. . As such, when the beads are included in the auxiliary layer 1600 at a higher density, the light emitted upward from the resin layer 230 may be diffused more widely.

Alternatively, the auxiliary layer 1600 may have a rigid plate shape like the diffusion plate 1800. In this case, although not shown, the auxiliary layer 1600 may include a plurality of beads, and scatter the light incident by using the beads to prevent the light from being concentrated on a specific portion.

In addition, the auxiliary layer 1600 may include a material such as polycarbonate (PC), polymethylmethacrylate (PMMA), and cyclic olefin copolymer (CC).

Alternatively, the auxiliary layer 1600 may be made of substantially the same material as the diffusion plate 1800.

As described above, even when the auxiliary layer 1600 is disposed between the diffusion plate 1800 and the resin layer 230, one surface of the auxiliary layer 1600 on which the light blocking part 260 is formed faces the resin layer 230. It may be desirable to be arranged to.

That is, when comparing the case of FIG. 16 with the case of FIG. 8, the light blocking part 260 may be regarded as being formed in the auxiliary layer 1600 instead of the diffusion plate 1800.

As shown in FIG. 17, the auxiliary layer 1600 may contact the diffusion plate 1800. For example, the auxiliary layer 1600 may be attached to the diffusion plate 1800. In addition, the light blocking unit 260 may be attached to the resin layer 230. Accordingly, the air layer 1610 may be formed between the auxiliary layer 1600 and the resin layer 230 in a region where the light blocking portion 260 is not formed. In other words, the air layer 1610 may be formed between two adjacent light blocking portions 260.

The air layer 1610 may diffuse the light emitted by the light source 220 more effectively.

As such, in order to attach the auxiliary layer 1600 to the diffusion plate 1800, it is possible to arrange the first adhesive layer 1620 between the auxiliary layer 1600 and the diffusion plate 1800 as in the case of FIG. 18. Do. In addition, in order to attach the light blocking portion 260 to the resin layer 230, it is possible to arrange the second adhesive layer 1630 between the light blocking portion 260 and the resin layer 230.

In this case, the air layer 1610 may be formed between the auxiliary layer 1600 and the resin layer 230 in a region where the light blocking portion 260 is not formed.

Alternatively, as shown in FIG. 19, the auxiliary layer 1600 and the diffusion plate 1800 may be spaced apart from the predetermined distance S2. In addition, the light shielding portion 260 and the resin layer 230 may also be spaced apart from the predetermined distance S1.

In this case, a first air layer 1650 is formed between the auxiliary layer 1600 and the diffusion plate 1800, and a second air layer 1640 is formed between the resin layer 230 and the light blocking part 260. Can be formed. Here, the second air layer 1640 may be located between the auxiliary layer 1600 and the resin layer 230 as well as between the light blocking portion 260 and the resin layer 230.

As such, when the auxiliary layer 1600 and the diffusion plate 1800 are spaced apart from each other by a predetermined distance S2, the auxiliary layer 1600, the resin layer 230, and the substrate 210 may be bent even if the diffusion plate 1800 is bent due to temperature change. ) Can be prevented from bending. In other words, even if the diffusion plate 1800 is bent, the entire backlight unit can be prevented from being bent. As a result, structural stability can be improved, and deterioration of optical properties can be prevented.

In addition, when the first air layer 1650 is formed between the auxiliary layer 1600 and the diffusion plate 1800, the light transmitted through the auxiliary layer 1600 may be diffused by the first air layer 1650. Therefore, light distribution can be made more uniform.

In addition, since the second air layer 1640 formed between the light blocking portion 260 and the resin layer 230 can also diffuse light, the light distribution can be made more uniform.

As in FIG. 19, in order to form the first air layer 1650 between the auxiliary layer 1600 and the diffusion plate 1800, it is possible to mount the diffusion plate 1800 on top of the auxiliary layer 1600. Do. In this case, the auxiliary layer 1600 and the diffusion plate 1800 are constructed using a non-tacky material to prevent the auxiliary layer 1600 from being attached to the diffusion plate 1800, thereby naturally spreading the auxiliary layer 1600 and the diffusion layer. The first air layer 1650 may be formed between the plates 1800.

Auxiliary layer in which the light blocking portion 260 is formed on the resin layer 230 to form the second air layer 1640 between the resin layer 230 and the auxiliary layer 1600 formed with the light blocking portion 260 ( 1600) is possible. In this case, the resin layer 230 and the light shielding portion 260 are made of a material having no adhesiveness, thereby preventing the light blocking portion 260 and the resin layer 230 from adhering to the light blocking portion 260 and the resin layer ( The second air layer 1640 may be formed between the 230.

Alternatively, as shown in FIG. 20, a portion on which the auxiliary layer 1600 may be seated and a portion on which the expansion plate 1800 may be seated may be provided on the rear cover 40. In this case, the first air layer 1650 may be formed between the auxiliary layer 1600 and the diffusion plate 1800 by the rear cover 40, and further, the auxiliary layer 1600 having the light blocking part 260 formed thereon. The second air layer 1640 may be formed between the resin layers 230.

Alternatively, as shown in FIG. 21, an adhesive layer is partially formed between the auxiliary layer 1600 and the diffusion plate 1800, and partially between the auxiliary layer 1600 and the resin layer 230 on which the light blocking portion 260 is formed. It is possible to form an adhesive layer.

For example, a third adhesive layer 1670 is formed between the auxiliary layer 1600 on which the light blocking portion 260 is formed and the light blocking portion 260 adjacent to each other between the resin layer 230 and the resin layer 230. The third adhesive layer 1670 may be omitted between the light blocking unit 260 and the light blocking unit 260. In this case, a third air layer 1690 may be formed between the resin layer 230 and the light blocking portion 260.

In addition, a fourth adhesive layer 1660 is formed between the auxiliary layer 1600 and the diffusion plate 1800 in a region that does not overlap with the light blocking portion 260, and in a region overlapping the light blocking portion 260. The fourth adhesive layer 1660 may be omitted. In this case, the fourth air layer 1680 may be formed between the auxiliary layer 1600 and the diffusion plate 1800 in a region overlapping the light blocking unit 260.

22 to 30 are views for explaining the light blocking unit in more detail. Hereinafter, the description of the parts described in detail above will be omitted. Hereinafter, a case in which the light source is a top-view type will be described with reference to FIGS. 22 to 25, and a case in which the light source is a side-view type will be described in FIGS. 26 to 30.

Referring to FIG. 22, the light blocking unit 260 may be disposed at positions corresponding to the light sources 220.

A portion of the light emitted from the light source 220 may be reflected by the light blocking portion 260 and diffused in the lateral direction. In detail, the light emitted from the light source 220 in the upward direction may be diffused in the lateral direction by the light blocking part 260 and reflected in the downward direction to reach the reflective layer 240. The light reaching the reflective layer 240 may be reflected by the reflective layer 240 to be reflected in the lateral direction and the upward direction.

As a result, the light emitted from the light source 220 may be diffused widely in the lateral direction without being concentrated in the upper region of the light source 220, and thus light of uniform brightness may be emitted from the backlight unit.

In addition, the light blocking unit 260 may be composed of a plurality of dots 261. That is, it is possible to form the light blocking portion 260 by forming a plurality of dot 261 patterns on one surface of the diffusion plate 1800.

In this case, the light blocking portion 260 may include a portion where the density of the dot 261 decreases as the light source 220 moves away from the light source 220. In other words, the number (density) per unit area of the dot 261 in the first area corresponding to the light source 220 is the unit area of the dot 261 in the second area spaced apart from the light source 220 by a predetermined distance. It may be more than the number (density) per sugar. In this case, the light transmittance of the second region in which the intensity of light reaching the first region is weaker may be higher than that of the first region. Thus, light can be more effectively dispersed.

Alternatively, as shown in FIG. 23, the light blocking portion 260 may include a portion where the thickness decreases as the light source 220 moves away from the light source 220. In other words, the thickness t1 of the light blocking portion 260 in the first region corresponding to the light source 220 is the thickness t2 of the light blocking portion 260 in the second region spaced apart from the light source 220 by a predetermined distance. May be thicker than). Even in this case, the light transmittance of the second region in which the intensity of light reaching the first region is weak may be higher than that of the first region. Thus, light can be more effectively dispersed.

Alternatively, as shown in FIG. 23, the light blocking portion 260 may include a portion where the thickness decreases as the light source 220 moves away from the light source 220. In other words, the thickness t1 of the light blocking portion 260 in the third region 262 corresponding to the light source 220 is the light blocking portion of the fourth region 263 spaced apart from the light source 220 by a predetermined distance. 260 may be thicker than the thickness t2. Even in this case, the light transmittance of the second region 263 in which the intensity of light reaching the first region 262 is weaker than that of the first region 262 may be higher than that of the first region 262. Thus, light can be more effectively dispersed.

Alternatively, as shown in FIG. 24, the light blocking unit 260 may include a portion where transparency increases as the light source 220 moves away from the light source 220. In other words, the transparency of the fifth region 264 corresponding to the light source 220 may be lower than the transparency of the sixth region 265 adjacent to the fifth region 264, and the transparency of the sixth region 265. May be lower than the transparency of the seventh region 266 adjacent to the sixth region 265. Even in this case, the light transmittance of the sixth region 265 in which the intensity of light reaching to the fifth region 264 is weak may be higher than that of the fifth region 264, and compared to the sixth region 265. The light transmittance of the seventh region 266 in which the intensity of light reaching is weak may be higher than that of the sixth region 265. Thus, light can be more effectively dispersed.

Alternatively, as illustrated in FIG. 25, a plurality of holes 267 are formed in the light blocking portion 260, and the light blocking portion 260 is a portion in which the size of the hole 267 increases as the light source 220 moves away from the light source 220. It may include. In other words, the aperture ratio in the eighth region corresponding to the light source 220 may be lower than the aperture ratio in the ninth region spaced apart from the light source 220 by a predetermined distance. Even in this case, the light transmittance of the ninth region having a weaker light intensity than that of the eighth region may be higher than that of the eighth region. Thus, light can be more effectively dispersed.

Referring to FIG. 26, an example of the case where the light source 220 emits light laterally (side-view) is disclosed. For example, if the light emitting surface of the light source 220 is the front surface of the light source 220, the brightness of the front of the light source 220 is high, while the brightness of the rear of the light source 220 may be low.

Therefore, it may be desirable to dispose the light blocking portion 260 to be biased toward the front side of the light source 220. In other words, the light blocking portion 260 includes a first portion extending from the light source 220 in the front direction of the light source 220 and a second portion extending from the light source 220 in the rear direction of the light source 220. The length W1 of the first portion may be longer than the length W2 of the second portion.

Alternatively, the light blocking part 260 may not be formed on the rear surface of the light source 220.

Even in this case, it is possible to prevent the light emitted from the light source 220 from being concentrated in a specific area.

Referring to FIG. 27, even when the light source 220 is a side-view type, the light blocking part 260 may be configured of a plurality of dots 261.

In this case, the light blocking unit 260 may have a number (density) per unit area of the dot 261 on the front surface (FS) of the light source 220 at the rear surface (RS) of the light source 220. It may be larger than the number (density) per unit area of the dot 261. In addition, the front surface of the light source 220 may include a portion in which the density of the dot 261 decreases away from the front surface. In other words, the number (density) per unit area of the dot 261 in the tenth area spaced first distance from the front surface of the light source 220 is greater than the second distance greater than the first distance from the front surface of the light source 220. It may be larger than the number (density) per unit area of the dot 261 in the twentieth region.

Even in this case, it is possible to prevent the light emitted from the light source 220 from being concentrated in a specific area.

Alternatively, as shown in FIG. 28, the light blocking part 260 may include a portion of the front surface of the light source 220 in which the density of the dots 261 decreases away from the front surface. In other words, the thickness t3 of the thirtieth area 268 of the light blocking part 260 corresponding to the light source 220 is the thickness t4 of the forty-second area 269 spaced a predetermined distance from the front surface of the light source 220. May be thicker than).

Even in this case, it is possible to prevent the light emitted from the light source 220 from being concentrated in a specific area.

Alternatively, as shown in FIG. 29, the light blocking unit 260 may include a portion where transparency increases as the light shielding unit 260 moves away from the front surface of the light source 220. In other words, the transparency of the fifty region 2400 corresponding to the light source 220 may be lower than the transparency of the sixty region 2410 adjacent to the fifty region 2400, and the transparency of the sixty region 2410. May be lower than the transparency of the seventieth region 2410 and the seventieth region 2420.

Even in this case, it is possible to prevent the light emitted from the light source 220 from being concentrated in a specific area.

Alternatively, as shown in FIG. 30, a plurality of holes 267 are formed in the light blocking portion 260, and the size of the hole 267 increases as the light blocking portion 260 moves away from the front surface of the light source 220. It can include a part. In other words, the aperture ratio in the 80th region corresponding to the light source 220 may be lower than the aperture ratio in the 90th region spaced apart from the front surface of the light source 220 by a predetermined distance. Even in this case, it is possible to prevent the light emitted from the light source 220 from being concentrated in a specific area.

31 to 35 are views for explaining the arrangement of the light sources of the backlight unit according to the embodiment of the present invention.

Referring to FIG. 31, a plurality of light sources 220 and 221 included in the backlight unit 200 are divided into a plurality of arrays, for example, a first light source array A1 and a second light source array A2. Can be.

The first light source array A1 and the second light source array A2 may each include a plurality of light source lines formed by the light sources. For example, the first light source array A1 consists of a plurality of lines L1 each including two or more light sources, and the second light source array A2 includes a plurality of lines each including two or more light sources ( L2).

The light source lines included in the first light source array A1 and the light source lines included in the second light source array A2 may be alternately arranged to correspond to the display area of the display panel 100.

As another embodiment of the present invention, the first light source array A1 is configured to include odd-numbered light source lines from above of a plurality of light source lines formed by the plurality of light sources, and the second light source array A2 is formed from above. It may be configured to include even-numbered light source lines.

The first light source line L1 included in the first light source array A1 and the second light source line L2 included in the second light source array A2 are disposed vertically adjacent to each other, and the first light source line L1 is disposed. ) And the second light source line L2 may be alternately arranged to constitute the backlight unit 200.

In addition, the light source 220 included in the first light source array A1 and the light source 221 included in the second light source array A2 may emit light in the same direction or may emit light in different directions. Can be.

Referring to FIG. 32, the backlight unit 200 may include two or more light sources emitting light in different directions.

That is, the light sources 220 included in the first light source array A1 and the light sources 221 included in the second light source array A2 may emit light in different directions. The direction in which the light emitting surfaces of the light sources 220 included in A1 face and the direction of the light emitting surfaces of the light sources 221 included in the second light source array A2 may be different from each other.

More specifically, the light emitting surface of the first light source 220 included in the first light source array A1 and the light emitting surface of the second light source 221 included in the second light source array A2 face opposite directions. Therefore, the first light source 220 included in the first light source array A1 and the second light source 221 included in the second light source array A2 may emit light in opposite directions. Can be.

In this case, the light sources provided in the backlight unit 200 may emit light in a lateral direction, respectively, and may be configured by using a side view type LED package.

Meanwhile, the plurality of light sources provided in the backlight unit 200 may be arranged to form two or more rows, and the two or more light sources arranged in the same row may emit light in the same direction.

For example, light sources left and right adjacent to the first light source 220 also emit light in the same direction as the first light source 220, that is, in a direction opposite to the x-axis direction, and adjacent to the second light source 221 from left and right. The light sources may also emit light in the same direction as the second light source 221, that is, in the x-axis direction.

As described above, the light emitting directions of the light sources disposed adjacent to the y-axis direction, for example, the first light source 220 and the second light source 221 are formed in opposite directions, thereby specifying the backlight unit 200. It is possible to reduce the phenomenon that the brightness of the light is concentrated or weakened in the region.

That is, the light emitted from the first light source 220 may be weakened as it proceeds to an adjacent light source. Accordingly, the farther away from the first light source 220, the brightness of the light emitted toward the display panel 100 in the corresponding area. Can be weakened.

Accordingly, by reversing the directions in which light is emitted from each of the first light source 220 and the second light source 221, the luminance of light is concentrated in an area adjacent to the light source and the brightness of light is weakened in an area far from the light source. As a result, the luminance of light emitted from the backlight unit 200 may be uniform.

In addition, the first light source line L1 included in the first light source array A1 and the second light source line L2 included in the second light source array A2 do not correspond to the left and right positions of the light sources, and alternate with each other. It may be disposed in the form, thereby improving the uniformity of the light emitted from the backlight unit 200.

That is, the second light source 221 included in the second light source array A2 may be disposed to be diagonally adjacent to the first light source 220 included in the first light source array A1.

Referring to FIG. 33, two light source lines each included in the first light source array A1 and the second light source array A2 and vertically adjacent to each other, for example, the first light source line L1 and the second light source line L2 may be spaced apart by a predetermined interval d1.

That is, the first light source 220 included in the first light source array A1 and the second light source 221 included in the second light source array A2 have a y-axis direction perpendicular to the x-axis, which is a direction in which light is emitted. It may be spaced apart by a predetermined interval (d1) relative to.

As the distance d1 between the first and second light source lines L1 and L2 increases, an area where light emitted from the first light source 220 or the second light source 221 cannot reach may occur. As a result, the luminance of light in the region may be very weak.

Meanwhile, as the gap d1 between the first and second light source lines L1 and L2 decreases, an interference phenomenon between light emitted from the first light source 220 and the second light source 221 may occur. In this case, the dividing driving efficiency of the light sources may decrease.

Thus, in order to reduce the interference between the light sources and at the same time to make the luminance of the light emitted from the backlight unit 200 uniform, adjacent light source lines, eg, first and second, in a direction intersecting with the direction in which the light is emitted. The distance d1 between the light source lines L1 and L2 may be 5 to 22 mm.

In addition, the third light source 222 may be included in the first light source line of the first light source array A1 to be disposed adjacent to the first light source 220 in a direction in which light is emitted, and the first light source 220 may be used. The third light source 222 may be spaced apart at a predetermined interval d2.

On the other hand, in order to reduce the interference between the light sources and at the same time to uniformize the brightness of the light emitted from the backlight unit 200, two light sources adjacent to each other in the direction in which the light is emitted, that is, the first light source 220 and the third light source 222 The distance d2 between) may be 9 to 27 mm.

The second light source 221 included in the second light source array A2 may be disposed to correspond to a position between the first light source 220 and the third light source 222 adjacent to each other included in the first light source array A1. Can be.

That is, the second light source 221 is disposed adjacent to the first light source 220 and the third light source 222 in the y-axis direction, and a straight line passing between the first light source 220 and the third light source 222 ( on l).

In this case, an interval d3 between the straight line l on which the second light source 221 is disposed and the first light source 220 is greater than an interval d4 between the straight line l and the third light source 222. Can be large.

The light emitted from the second light source 221 travels in a direction opposite to the light emission direction of the third light source 222, and thus the light emitted from the second light source 221 toward the display panel 100 in the region adjacent to the third light source 222. The brightness may be weakened.

Thus, by arranging the second light source 221 to be closer to the third light source 222 than the first light source 220 as described above, the second light source is weakened in the region adjacent to the third light source 222. Compensation may be made by using luminance of light concentrated in an area adjacent to 221.

Meanwhile, at least one of the plurality of light sources 220 provided in the backlight unit 200 may emit light in a horizontal direction, that is, a direction slightly oblique to the x axis direction.

For example, referring to FIG. 34, a direction in which the light emitting surfaces of the light sources 220 and 221 face may be formed obliquely upward or downward by a predetermined angle with respect to the x-axis direction.

In addition, referring to FIG. 35, the light sources 220, 221, and 224 included in the light source lines L1, L2, and L3 may be alternately disposed. For example, the light sources included in the lines L1, L3 and L2 of the first light source array A1 may be alternated with the light sources included in the lines L2, L1 and L3 of the second light source array A2.

Accordingly, the lines L1, L3 and L2 included in the first light source array A1 and the lines L2, L1 and L3 included in the second light source array A2 may be alternately disposed. In addition, the light sources 220, 221, 222, 224, etc. may be the same light source, but emit light in different directions or, if necessary, light sources having different characteristics such as different types or sizes or directions. It may be.

36 is a diagram for explaining a unit substrate structure. Hereinafter, the description of the parts described in detail above will be omitted.

Referring to FIG. 36, the first layer 210 described above, the plurality of light sources 220 disposed on the first layer 210, the second layer 230 surrounding the plurality of light sources 220, The reflective layer 240 disposed on the first layer 210 and the plurality of diffusion patterns 241 disposed on the reflective layer 240 may be configured as one optical assembly. One such optical assembly may be referred to as a unit substrate.

The backlight unit 200 may be configured by arranging a plurality of such optical assemblies.

On the other hand, the plurality of optical assemblies 10 provided in the backlight unit 200 may be arranged in a matrix form of N and M (N, M is one or more natural numbers) in the x-axis and y-axis directions, respectively.

As illustrated in FIG. 36, the backlight unit 200 may include 21 optical assemblies 10 arranged in a 7 × 3 array. However, since the configuration shown in FIG. 36 is only an example for describing the backlight unit according to the present invention, the present invention is not limited thereto and may be changed according to the screen size of the display device.

For example, in the case of a 47-inch display device, the backlight unit 200 may be configured by arranging 240 optical assemblies 10 as described above in a 24 × 10 arrangement.

Each optical assembly 10 may be manufactured as an independent assembly, and may be disposed in close proximity to form a modular backlight unit. Such a modular backlight unit may provide light to the display panel 100 as a backlight means.

As described above, the backlight unit 200 may be driven in a full driving manner or a partial driving scheme such as local dimming or impulsive. The driving method of the backlight unit 200 may be variously changed according to a circuit design, but is not limited thereto. As a result, the color contrast ratio is increased and the image of the bright and dark parts of the screen can be clearly expressed, thereby improving the image quality.

That is, the backlight unit 200 is divided into a plurality of divided driving regions, and the luminance of the divided driving region is linked with the luminance of the image signal so that the black portion of the image decreases the brightness and the bright portion increases the brightness. , Improve the contrast and sharpness.

For example, only some of the plurality of optical assemblies 10 can be driven independently to emit light upwards, for which the light sources 220 included in each of the optical assemblies 10 are independently controlled. Can be.

Meanwhile, an area of the display panel 110 corresponding to one optical assembly 10 may be divided into two or more blocks, and the display panel 100 and the backlight unit 200 may be divided and driven in units of the blocks. .

By assembling the plurality of optical assemblies 10 as described above to configure the backlight unit 200, it is possible to simplify the manufacturing process of the backlight unit 200, to minimize the loss (loss) that may occur in the manufacturing process Productivity can be improved. In addition, the backlight unit 200 has an effect that can be applied to a backlight unit of various sizes by standardizing the optical assembly 10 to mass production.

On the other hand, if any one of the plurality of optical assemblies 10 provided in the backlight unit 200 is defective, the replacement operation is not necessary because only the defective optical assembly needs to be replaced without replacing the entire backlight unit 200. It is easy to reduce the cost of replacing parts.

FIG. 37 is a cross-sectional view illustrating a configuration of a display apparatus according to an exemplary embodiment of the present disclosure, and descriptions of the above-described parts will be omitted.

Referring to FIG. 37, a display panel 110 including a first substrate 111, a second substrate 112, an upper polarizer 160a, and a lower polarizer 160b, a first layer 210, and a plurality of layers may be provided. The backlight unit 200 including the light sources 220 and the second layer 230 may be in close contact with each other.

For example, an adhesive layer 170 may be formed between the backlight unit 200 and the display panel 110 so that the backlight unit 200 may be adhered to and fixed to the lower side of the display panel 110.

More specifically, the upper surface of the backlight unit 200 may be adhered to the lower surface of the lower polarizer 160b by using the adhesive layer 170. The backlight unit 200 may further include a diffusion plate 245 on the second layer 230. In addition, a plurality of optical sheets (not shown) may be provided between the diffusion plate 245 and the adhesive layer 170.

In addition, a bottom plate 135 may be disposed below the backlight unit 200, and the bottom plate 135 may be formed to be in close contact with the bottom surface of the first layer 210.

The display device may include a driving unit for supplying driving signals and power to the display module, more specifically, the display panel 110 and the backlight unit 200. For example, the display device may be provided in the backlight unit 200. The plurality of light sources 220 may be driven by using a voltage supplied from the driver to emit light.

The driving unit may include a driving control unit 141, a power supply unit 143, and a main board (not shown). In order for the driving unit to be stably supported and fixed, the driving unit may include a driving unit chassis disposed on the bottom plate 135. 145 may be disposed and fixed.

According to an embodiment of the present invention, a first connector 410 may be formed on the rear surface of the first layer 210, and a hole for inserting the first connector 410 into the bottom plate 135 is formed therefor. 350 may be formed.

The first connector 410 electrically connects the light source 220 and the power supply unit 143 so that a driving voltage can be supplied from the power supply unit 143 to the light source 220.

For example, the first connector 410 is formed on the lower surface of the first layer 210 and is connected to the power supply unit 143 using the first cable 410 to supply power through the first cable 421. The driving voltage supplied from the supply unit 143 may be transmitted to the light source 220.

An electrode pattern (eg, carbon nanotube electrode pattern) may be formed on the top surface of the first layer 210. The electrode formed on the upper surface of the first layer 210 may be in contact with the electrode formed in the light source 220 to electrically connect the first connector 410 and the light source 220.

In addition, the display apparatus may include a driving controller 141 for controlling driving of the display panel 100 and the backlight unit 200. For example, the driving controller 141 may be a timing controller. Can be.

The timing controller controls driving timing of the display panel 100, and more specifically, a data driver (not shown), a gamma voltage generator (not shown), and a gate driver (not shown) included in the display panel 100. A signal for controlling the driving timing of the signal may be generated and supplied to the display panel 100.

Meanwhile, the timing controller backlights a signal for controlling the driving timing of the light sources 220 such that the backlight unit 200, and more particularly, the light sources 220 operate in synchronization with driving of the display panel 100. It may be supplied to the unit 200.

As shown in FIG. 37, in order to stably support and fix the driving control unit 141, the driving control unit 141 may be fixed on the driving unit chassis 145 disposed on the bottom plate 135.

According to an embodiment of the present disclosure, a second connector 320 may be formed on the substrate 210, and a hole 350 for inserting the second connector 320 is formed in the bottom plate 135. It may be.

The second connector 320 may electrically connect the first layer 210 and the driving controller 141 to supply the control signal output from the driving controller 141 to the first layer 210.

For example, the second connector 320 is formed on the lower surface of the first layer 210, is connected to the driving control unit 141 using the second cable 420, and is driven through the second cable 420. The control signal supplied from the controller 141 may be transmitted to the first layer 210.

Meanwhile, a light source driver (not shown) may be formed in the first layer 210, and the light source driver (not shown) may be controlled using a control signal supplied from the driving controller 141 through the second connector 320. The light sources 220 may be driven.

In addition, the power supply unit 143 and the driving control unit 141 described above may be wrapped in the rear case 150 to be protected from the outside.

The configuration of the display device illustrated in FIG. 37 is only an embodiment of the present disclosure, and accordingly, the power supply unit 143, the driving control unit 141, the first and second connectors 310 and 320, and the first and the first devices The position or number of the two cables 410 and 420 can be changed as necessary.

As described above, it is to be understood that the technical structure of the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

Claims (18)

Board;
A light source disposed on the substrate; And
A resin layer disposed on the substrate on which the light source is disposed; And
A diffusion plate disposed on the resin layer;
Including,
A light blocking unit is printed on one surface of the diffusion plate, and the diffusion plate is disposed in a direction in which one surface on which the light blocking unit is printed faces the resin layer. The method of claim 1,
The light blocking unit is formed in a position corresponding to the light source. The method of claim 1,
The resin layer is formed with a depression recessed in the direction toward the substrate,
The light blocking unit is a backlight unit located in the depression. The method of claim 1,
The backlight unit is formed between the diffusion plate and the resin layer (Air Layer). The method of claim 1,
And a bonding layer formed between the diffusion plate and the resin layer. The method of claim 1,
The backlight unit is in contact with the light blocking portion and the resin layer. The method of claim 1,
The light blocking unit includes a titanium dioxide (TiO 2 ) material. The method of claim 1,
The backlight unit to which the optical sheet is attached to the other surface of the diffusion plate. The method of claim 1,
The light blocking unit includes a portion of which the thickness decreases away from the light source. The method of claim 1,
The light blocking unit includes a portion that increases transparency as it moves away from the light source. The method of claim 1,
The light blocking unit includes a plurality of dots, and includes a portion in which the density of the dots decreases away from the light source. The method of claim 1,
The light blocking unit includes a plurality of holes (Hole) is formed, the backlight unit including a portion in which the size of the hole increases as the distance from the light source. The method of claim 1,
The light source has a light emitting surface facing a direction parallel to the substrate, and when the light emitting surface faces a front of the light source,
And a portion where the light blocking portion is not formed on a rear surface of the light source. Board;
A light source disposed on the substrate; And
A resin layer disposed on the substrate on which the light source is disposed; And
A diffusion plate disposed on the resin layer;
Including,
A plurality of protrusions are formed on one surface of the diffusion plate, and the light blocking unit is printed on the protrusions. The method of claim 14,
The diffusion plate is a backlight unit is disposed in a direction in which one surface printed with the light shielding portion toward the resin layer. The method of claim 14,
The protrusion unit has a pyramid shape. Display panel; And
A backlight unit attached to a rear surface of the display panel;
Including,
The backlight unit
Board;
A light source disposed on the substrate; And
A resin layer disposed on the substrate on which the light source is disposed; And
A diffusion plate disposed on the resin layer;
Including,
A display device is printed on one surface of the diffusion plate, and the diffusion plate is disposed in a direction in which one surface on which the light shield is printed faces the resin layer. Display panel; And
A backlight unit attached to a rear surface of the display panel;
Including,
The backlight unit
Board;
A light source disposed on the substrate; And
A resin layer disposed on the substrate on which the light source is disposed; And
A diffusion plate disposed on the resin layer;
Including,
A plurality of protrusions are formed on one surface of the diffusion plate, and the light blocking unit is printed on the protrusions.
KR1020100035238A 2009-08-27 2010-04-16 Back light unit and display apparatus KR20110115739A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020100035238A KR20110115739A (en) 2010-04-16 2010-04-16 Back light unit and display apparatus
PCT/KR2010/005435 WO2011025175A2 (en) 2009-08-27 2010-08-17 Backlight unit and display device
EP10812189.8A EP2470952B1 (en) 2009-08-27 2010-08-17 Backlight unit and display device
US12/860,704 US8511845B2 (en) 2009-08-27 2010-08-20 Backlight unit and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100035238A KR20110115739A (en) 2010-04-16 2010-04-16 Back light unit and display apparatus

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130107797A (en) * 2012-03-23 2013-10-02 엘지이노텍 주식회사 Display rear view mirror
KR20180046467A (en) * 2016-10-28 2018-05-09 엘지디스플레이 주식회사 Back light unit and liquid crystal display device using the same
US10062672B2 (en) 2014-07-23 2018-08-28 Lg Innotek Co., Ltd. Light source module
WO2019221431A1 (en) * 2018-05-18 2019-11-21 엘지이노텍 주식회사 Lighting module and lighting device comprising same
CN113272727A (en) * 2018-11-12 2021-08-17 康宁公司 Backlight including patterned reflector, diffusion plate, and method of manufacturing backlight
KR20210101369A (en) 2020-02-07 2021-08-19 희성전자 주식회사 LED array and backlight unit having the same
WO2021221899A1 (en) * 2020-04-28 2021-11-04 Corning Incorporated Backlights including patterned reflectors
WO2022211442A1 (en) * 2021-04-02 2022-10-06 엘지이노텍 주식회사 Lighting device
US20230026878A1 (en) * 2021-07-13 2023-01-26 Lg Display Co., Ltd. Backlight unit and display device including the same

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130107797A (en) * 2012-03-23 2013-10-02 엘지이노텍 주식회사 Display rear view mirror
US10062672B2 (en) 2014-07-23 2018-08-28 Lg Innotek Co., Ltd. Light source module
KR20180046467A (en) * 2016-10-28 2018-05-09 엘지디스플레이 주식회사 Back light unit and liquid crystal display device using the same
WO2019221431A1 (en) * 2018-05-18 2019-11-21 엘지이노텍 주식회사 Lighting module and lighting device comprising same
KR20190132124A (en) * 2018-05-18 2019-11-27 엘지이노텍 주식회사 Lighting module and lighting apparatus
US11387395B2 (en) 2018-05-18 2022-07-12 Lg Innotek Co., Ltd. Lighting module and lighting device comprising the same
CN113272727A (en) * 2018-11-12 2021-08-17 康宁公司 Backlight including patterned reflector, diffusion plate, and method of manufacturing backlight
KR20210101369A (en) 2020-02-07 2021-08-19 희성전자 주식회사 LED array and backlight unit having the same
WO2021221899A1 (en) * 2020-04-28 2021-11-04 Corning Incorporated Backlights including patterned reflectors
WO2022211442A1 (en) * 2021-04-02 2022-10-06 엘지이노텍 주식회사 Lighting device
US20230026878A1 (en) * 2021-07-13 2023-01-26 Lg Display Co., Ltd. Backlight unit and display device including the same
US11852922B2 (en) * 2021-07-13 2023-12-26 Lg Display Co., Ltd. Backlight unit and display device including the same

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