KR101676872B1 - optical assembly, backlight unit having the same, and display apparatus thereof - Google Patents

optical assembly, backlight unit having the same, and display apparatus thereof Download PDF

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Publication number
KR101676872B1
KR101676872B1 KR1020090124164A KR20090124164A KR101676872B1 KR 101676872 B1 KR101676872 B1 KR 101676872B1 KR 1020090124164 A KR1020090124164 A KR 1020090124164A KR 20090124164 A KR20090124164 A KR 20090124164A KR 101676872 B1 KR101676872 B1 KR 101676872B1
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KR
South Korea
Prior art keywords
light guide
light
guide plate
direction
region
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Application number
KR1020090124164A
Other languages
Korean (ko)
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KR20110067534A (en
Inventor
구희술
정주영
김승세
Original Assignee
엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020090124164A priority Critical patent/KR101676872B1/en
Priority claimed from EP20100015492 external-priority patent/EP2354817A1/en
Publication of KR20110067534A publication Critical patent/KR20110067534A/en
Application granted granted Critical
Publication of KR101676872B1 publication Critical patent/KR101676872B1/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055Reflecting element, sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075Arrangements of multiple light guides
    • G02B6/0078Side-by-side arrangements, e.g. for large area displays
    • G02B6/008Side-by-side arrangements, e.g. for large area displays of the partially overlapping type
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/133308LCD panel immediate support structure, e.g. front and back frame or bezel
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553Reflecting elements

Abstract

The present invention relates to an optical assembly, a backlight unit and a display device using the same.
The optical assembly according to an embodiment of the present invention includes: a substrate; A plurality of light sources arranged on the substrate and having a predetermined directional angle about a first direction to emit light; A light incident portion including an incident surface through which light is incident in a first direction from the plurality of light sources, and a light emitting portion that is emitted in a second direction in which the incident light intersects the first direction, A light guide plate including a light emitting portion; And a reflective member including a reflective region overlapping the light guide plate and an extended region not overlapping the light guide plate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an optical assembly, a backlight unit having the same, and a display device having the same,

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

(PDP), Electro Luminescent Display (ELD), Vacuum Fluorescent Display (VFD), and the like have been developed in recent years in response to the demand for display devices. Display) have been studied and used.

Among them, a liquid crystal panel of an LCD includes a liquid crystal layer and a TFT substrate and a color filter substrate facing each other with the liquid crystal layer interposed therebetween. Since there is no self-luminous force, the image is displayed using light provided from the backlight unit can do.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a backlight unit capable of improving the image quality of a display image and a display device using the same.

An optical assembly according to an aspect of this embodiment includes: a substrate; A plurality of light sources arranged on the substrate and having a predetermined directivity angle around a first direction to emit light; A light incident portion including an incident surface through which light is incident in a first direction from the plurality of light sources, and a light emitting portion that is emitted in a second direction in which the incident light intersects the first direction, A light guide plate including a light emitting portion; And a reflective member including a reflective region overlapping the light guide plate and an extended region not overlapping the light guide plate.

According to another aspect of the present invention, there is provided an optical assembly comprising: a substrate; A plurality of light sources arranged on the substrate and having a predetermined directivity angle around a first direction to emit light; A light incident portion including an incident surface through which light is incident in a first direction from the plurality of light sources, and a light emitting portion that is emitted in a second direction in which the incident light intersects the first direction, A light guide plate including a light emitting portion; And a reflective member including a first region overlapping the light guide plate and a second region not overlapping the light guide plate.

A backlight unit according to an aspect of this embodiment includes a bottom cover; A substrate accommodated in the bottom cover; A plurality of light sources arranged on the substrate and having a predetermined directivity angle around a first direction to emit light; A light incident portion including an incident surface through which light is incident in a first direction from the plurality of light sources, and a light emitting portion that is emitted in a second direction in which the incident light intersects the first direction, A plurality of light guide plates including a plurality of light guide portions; At least one reflective member including a reflective region overlapping with any one of the light guide plates and an extended region not overlapping with the light guide plate; And an optical sheet disposed on the upper side of the light guide plate.

According to another aspect of the present invention, a backlight unit includes at least one optical sheet; A plurality of optical assemblies positioned below the optical sheet; And a bottom cover in which the plurality of optical assemblies are received and to which the optical sheet is fixed, the optical assembly comprising: a substrate; A plurality of light sources arranged on the substrate and having a predetermined directivity angle around a first direction to emit light; A light incident portion including an incident surface through which light is incident in a first direction from the plurality of light sources, and a light emitting portion that is emitted in a second direction in which the incident light intersects the first direction, At least one light guide plate including the light guide plate; And a reflective member provided below the light guide plate and including a reflective region overlapping with the light guide plate and an extended region not overlapping with the light guide plate, and a reflection member provided on any one of the plurality of optical assemblies, One frame is spaced apart from a rim of any one of the light guide plates provided in another adjacent optical assembly by a predetermined distance, and at least one edge of the extended region of the reflective member provided in one of the optical assemblies Some of which are located at the spacing distance, and the other portion of which overlaps at least a portion of the reflective member of another adjacent optical assembly.

A display device according to an aspect of this embodiment includes a display panel; A backlight unit located on a back surface of the display panel, the backlight unit being divided into a plurality of blocks and the plurality of blocks being individually driven; And a driving unit provided behind the backlight unit and driving the display panel and / or the backlight unit, wherein the backlight unit includes: a bottom cover; A substrate accommodated in the bottom cover; A plurality of light sources arranged on the substrate and having a predetermined directivity angle around a first direction to emit light; A light incident portion including an incident surface through which light is incident in a first direction from the plurality of light sources, and a light emitting portion that is emitted in a second direction in which the incident light intersects the first direction, A plurality of light guide plates including a plurality of light guide portions; At least one reflective member including a reflective region overlapping with any one of the light guide plates and an extended region not overlapping with the light guide plate; And an optical sheet disposed on the upper side of the light guide plate.

According to the present invention, a modular backlight unit including a plurality of light guide plates is used to provide light to a display panel, thereby reducing the thickness of a display device and thereby reducing local dimming or impulsive ) Can be used to improve the contrast of the display image.

And, there is an advantage that the reflective member of either optical assembly can be continuously reflected into the uniform light emitted from the plurality of optical assemblies as at least part of the reflective member overlaps with the other reflective member.

Hereinafter, the present invention will be described with reference to the accompanying drawings. Hereinafter, the embodiments may be modified into various other forms, and the technical scope of the embodiments is not limited to the embodiments described below. The embodiments are provided so that this disclosure may be more fully understood by those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

1 is an exploded perspective view showing a configuration of a display device according to a first embodiment of the present invention.

1, a display device 1 according to the present embodiment includes a display module 200, a front cover 300 and a back cover 400 surrounding the display module 200, a display module 200, And a fixing member 500 for fixing the front cover 300 to the front cover 300 and / or the back cover 400.

One side of the fixing member 500 is fixed to the front cover 300 by a fastening member such as a screw and the other side of the fixing member 500 supports the display module 200 to the side of the front cover 300, The display module 200 may be fixed with respect to the display module 200.

Although the fixing member 500 is described as being formed in a plate shape elongated in one direction in the present embodiment, the fixing member 500 may not be provided, It is also possible that the front cover 300 or the back cover 400 is fixed.

FIG. 2 is a cross-sectional view illustrating a configuration of a display module according to the A-A diagram of FIG. 1. FIG.

2, the display module 200 includes a display panel 210 on which an image is displayed, a backlight unit 100 that provides light to the display panel 210, And a top cover 230 which supports the display panel 210 from above and forms the rim of the display module 200, ).

The bottom cover 110 may be formed in a box shape having an opened top surface so that the backlight unit 100 can be housed. One side of the bottom cover 110 may be fixed to one side of the top cover 230. For example, a fastening member such as a screw penetrates the side of the display module 200, that is, the side where the bottom cover 110 and the top cover 230 are overlapped with each other so that the bottom cover 110 and the top cover 230 Can be fixed.

At least one substrate 250 is mounted on the bottom surface of the bottom cover 110 to allow the display module 200 to be driven by an external signal such as a video signal.

The substrate 250 may be a driving unit of a timing controller (T-con board) or an image panel and / or a backlight unit such as a main PCB. The substrate 250 may be a part of the bottom cover 110 For example, a fastening member or an adhesive member such as a screw.

Although not shown in detail, the display panel 210 may include a lower substrate 211 and an upper substrate 222 that are bonded together to maintain a uniform cell gap so as to face each other, and a liquid crystal layer (not shown) interposed between the two substrates. . A plurality of gate lines and a plurality of data lines intersecting the plurality of gate lines are formed on the lower substrate 211, and a thin film transistor (TFT) may be formed on the intersections of the gate lines and the data lines. have.

Color filters may be formed on the upper substrate 212. The structure of the display panel 210 is not limited thereto, and the display panel 210 may have various structures. As another example, the lower substrate 211 may include a color filter as well as a thin film transistor. In addition, the display panel 210 may have various structures depending on the method of driving the liquid crystal layer.

Although not shown, a gate driving printed circuit board (PCB) for supplying a scan signal to a gate line is provided at an edge of the display panel 210, a data driving printed circuit board (PCB) May be provided. On the other hand, a polarizing film (not shown) may be disposed on at least one of the upper side and the lower side of the display panel 210.

Meanwhile, the backlight unit 100 according to the present embodiment includes a plurality of optical assemblies 10 each including a light source 13, a substrate 14, a light guide plate 15, a reflective member 17, and a fixing bracket 18, And an optical sheet 220 provided between the display panel 210 and the display panel 210.

The optical sheet 220 according to the present embodiment can be removed, but is not limited thereto. The optical sheet 220 may include a diffusion sheet (not shown) and / or a prism sheet (not shown).

The diffusing sheet diffuses the light emitted from the light guide plate evenly, and the diffused light can be converged on the display panel by the prism sheet. Here, the prism sheet may be selectively formed using a horizontal or vertical prism sheet, one or more roughness enhancing films, or the like.

The types and the number of the optical sheets 220 can be added or deleted within the technical scope of the embodiments, but the invention is not limited thereto.

A plurality of optical assemblies 10 are arranged below the display panel 210 and the optical sheet 220 to emit light toward the display panel 210 to irradiate the display panel 210 with light.

3 is a plan view schematically showing the configuration of the backlight unit.

Referring to FIG. 3, the backlight unit 100 includes a plurality of N light guide plates 15 (N is 2 or more) in a first direction in the y-axis direction, and the backlight unit 100 is formed (M is 2 or more) light guide plates 15 in a third direction that is an x-axis direction intersecting the y-axis on a plane.

At this time, since the light emitting portion 15a of one of the light guide plates 15 disposed in the first direction is disposed above the light entrance portion 15 of the other light guide plate 15, At least two light guide plates 15 adjacent to each other in the first direction may be partially overlapped with each other.

That is, among the N light guide plates, the other end 156 of the light emitting portion 15a of the K-th light guide plate (K is any one of 1 to N-1) And at least a part of the at least two light guide plates 15 disposed above the light portion 15b and overlapped with each other may be provided.

The optical assemblies 10 adjacent to each other are spaced apart from each other by a predetermined distance d4 and d6 to form a spaced-apart space.

That is, the light emitting portions 15a of the two light guide plates 15, which are disposed in the first direction (y-axis direction), which is the center direction in which light is emitted from the light source 13, Are spaced apart from each other by an interval d6.

Also, the two light guide plates 15 disposed in the third direction (x-axis direction) intersecting with the first direction are adjacent to each other at a second spacing d4.

At this time, the first spacing d6 is formed in the third direction (x-axis direction), the second spacing d4 is formed in the first direction (y-axis direction) The spacing d6 and the second spacing d4 intersect each other.

A bright line or a dark line may appear in the region 60 corresponding to the boundary portion at the boundary between the optical assemblies 10, the light guide plates 15 in more detail, by the above-mentioned intervals d4 and d6.

That is, as the distances d1 and d2 between the adjacent light guide plates 15 become narrower, the amount of light emitted to the front face through the boundary portion increases, and the area 60 corresponding to the boundary portion between the light guide plates 15 As the luminance of the light increases, a bright line may appear, and thus a bright line may be visually displayed on the display screen.

That is, as the distance d1, d2 between the light guide plates 15 adjacent to each other is widened, the amount of light emitted to the front face through the boundary portion decreases, and the area 60 corresponding to the boundary portion between the light guide plates 15 As the luminance of the light becomes lower, a dark line may appear.

Therefore, according to the embodiment of the present invention, the numerical range in which no glow line or dark line appears at the boundary portion between the light guide plates 15 adjacent to each other, that is, the first spacing distance d6 is 0.1 mm to 7 mm, and the second spacing d4 may be, for example, between 0.1 mm and 7 mm.

At least a part of the reflective member 17 of the light guide plate 15 of one of the two light guide plates 15 adjacent to each other is positioned in the spacing space and the inner surface of the bottom cover 110 It is prevented from being exposed in the first direction (y-axis direction).

On the other hand, in the display device 1 according to the embodiment, three optical assemblies 10 are arranged in the first direction, three optical assemblies 10 are arranged in the third direction, The backlight unit 100 satisfying the light guide plate arrangement conditions will be described.

The optical assemblies 10 may be fabricated as independent assemblies and may be closely spaced to form a modular backlight unit. Such a modular backlight unit can provide light to the display panel 210 as backlight means.

The backlight unit 100 may be driven by a whole driving method or a partial driving method such as local dimming, impulsive, or the like. The driving method of the light emitting diode may be variously changed according to the circuit design, but is not limited thereto. Thus, in the embodiment, the color contrast ratio is increased and the image of the bright part and the dark part on the screen can be expressed clearly, thereby improving the image quality.

That is, the backlight unit 100 is divided into a plurality of divided driving regions corresponding to the plurality of light guide plates 15, and the luminance of the divided driving region is associated with the luminance of the video signal, And the bright portion increases the brightness, thereby improving the contrast ratio and sharpness.

On the other hand, the area of the display panel 210 corresponding to one optical assembly 10 or one light guide plate 15 can be divided into two or more blocks, and the display panel 210 and the backlight unit can be divided into blocks Can be driven.

At this time, the light guide plate 15 of the optical assembly 10 of C1 to C3 is disposed in the central row C of the backlight unit 100, and the left and right rows L and R are arranged around the center row C. [ The light guide plate 15 of L1 to L3 and the light guide plate 15 of R1 to R3 are disposed.

More specifically, in the backlight unit 100 according to the present embodiment, the nine light guide plates 15 may be arranged in the form of three rows and three columns as described above. A reflective member 17 is disposed on the lower side of each of the light guide plates 15 so that light incident on the light guide plate 15 in the first direction is reflected in a second direction (z-axis direction) intersecting the first direction Allows light to be emitted.

At this time, the reflective member 17 disposed on the light guide plate 15 of the optical assembly 10 of C1 to C3 disposed in the central column C is formed so that at least a part thereof extends further in the outward direction of the rim of the light guide plate 15 do. An extended portion of the reflection member 17 positioned on the side of the center column C overlaps with the reflection member 17 located on the left side L and the right side R side.

Hereinafter, the configuration of the optical assembly 10 will be described in detail.

4 is an exploded perspective view showing an optical assembly according to a first embodiment of the present invention,

4, a plurality of optical assemblies 10 may be arranged at least partially fixed to the bottom cover 110. As described above, each of the optical assemblies 10 includes a light source 13, a substrate 14, a light guide plate 15 A reflecting member 17, and a fixing bracket 18, as shown in Fig.

A plurality of light sources 13 may be provided, and the light sources 13 are disposed on the side surfaces of the light guide plate 13 in the third direction (x-axis direction). Therefore, the light emitted from the light source 13 is incident on the side surface of the light guide plate 13.

In this case, the light source 13 may include a light emitting diode (LED), and may include a plurality of light emitting diodes (LEDs).

The light emitting diode may be a side luminescent type that emits light laterally. A colored LED that emits at least one color out of colors such as red, blue, and green, or an LED that emits white light by applying a yellow phosphor to a blue LED.

The light emitting diodes may be disposed on the substrate 14 and may include a light emitting diode that emits light having a wavelength between 430 nm and 480 nm. The light emitting surface of the light emitting diode may include a light emitting diode May be provided.

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 such a light emitting diode may be changed within the technical scope of the embodiment.

In addition, the light sources 13 according to the present embodiment have a predetermined directional angle around the first direction and emit light.

The plurality of light sources 13 are disposed on the substrate body 141 of the substrate 14 extending in the direction parallel to the third direction (x-axis direction) Axis direction) of the first and second axes.

That is, the light source 13 is mounted on the rear region k2 with respect to the first direction of the substrate body 141, the front region k1 is formed on the front side of the rear region k2, the size of the rear region k1 may be larger than the size of the rear region k2.

This ensures that the front region k1 is provided with a supporting space of a predetermined size capable of supporting at least a part of the light guide plate 15 and the reflecting member 17, As the size of the area k2 decreases, the width of the bezel area of the display module where the rear area k2 is located, i.e., the width of the rim of the display module can be reduced, .

In this case, the first direction (y-axis direction) may be referred to as a front-back direction with respect to the light guide plate 15, and the third direction (x-axis direction) may be referred to as a right and left direction with respect to the light guide plate 15. The forward direction in the front-rear direction means a direction (+ y-axis direction) in which light enters the light guide plate 15 from the light source 13, and the backward direction means the opposite direction to the front direction (-y-axis direction).

The substrate body 141 may further include a through hole 142 through which the fastening member 51 is inserted.

The through holes 142 may be disposed between the plurality of light sources 13. For example, in this embodiment, the through holes 142 may be formed in the substrate body 141 on the left and right sides of the substrate body 141 and the four light sources 13 Respectively.

At this time, the fastening member 51 integrally penetrates the fixing bracket 18, the reflecting member 17 and the substrate 14 to match the configuration of the optical assembly 10, Is fixed to the bottom cover 110.

The light guide plate 15 is made of a transparent material and includes one of acrylic resin type such as PMMA (polymethyl methacrylate), polyethylene terephthlate (PET), polycarbonate (PC), and polyethylene naphthalate can do. The light guide plate 15 may be formed by an extrusion molding method.

The light guide plate 15 scatters the light incident from the light source 13 and guides the light to emit toward the upward direction.

More specifically, the light guide plate 15 reflects upward (in the z-axis direction), that is, the display panel 210, which is formed in the upward direction by refracting and scattering light incident from the light source 13 in the forward (y- And the bottom surface of the light guide plate 15 is formed so as to be inclined upward toward the front so as to efficiently emit the light incident from the side face upward.

At least a part of the bottom surface of the light guide plate 15 is seated and supported on the front region k1 of the substrate body 141. [

The light guide plate 15 further includes a light incident portion 15b having an incident surface 151 facing the light source 13 and a light emitting portion 15a extending forward from the light incident portion 15b.

At this time, the rear side where the incident surface 151 is positioned in the light guide plate 15 is referred to as one side of the light guide plate 15, and the front side end 155 of the light guide plate 15 is referred to as the other side of the light guide plate 15 .

A plurality of lights incident on the light guide plate 15 through the incident surface 151 of the plurality of light sources 13 are synthesized into one light through the light incident portion 15b and diffused through the light emitting portion 15a And is emitted toward the upper side of the light guide plate 15.

The light emitted from the light emitter 15b is transmitted to the light emitter 15a through the upper surface 153 of the light emitter 15a. The light emitter 15a is connected to the other side of the light emitter 15b. do.

The vertical height h2 of the light emitting surface on which light is emitted from the light source 13 is substantially equal to or smaller than the vertical height h1 of the incident surface 151 of the light incident portion 15b of the light guide plate 15 .

That is, when the height h2 of the light sources 13 is greater than the height h1 of the incident surface 151, a part of the light emitted from the light emitting surface (not shown) The light can be leaked to the surroundings without being incident on the light guide plate 151.

The height h1 of the incident surface 151 is equal to or greater than the height of the light sources 13 in the light source 13 because the light sources 13 have a directional angle of 90 degrees or more and emit light. h2.

However, when the height h1 of the incident surface 151 exceeds twice the height h2 of the light sources 13, the light leakage prevention and the light efficiency increase are not performed any more, A reduction in the light efficiency can be generated.

Therefore, the height h1 of the incident surface 151 according to the present embodiment is formed to be equal to or less than twice the height h2 of the light sources 13 or the height h2 of the light sources 13 do.

At this time, the light-incident portion 15b extends by a predetermined distance d1 toward the first direction (y-axis direction), and the light-emitting portion 15a extends forward from the light-incident portion 15b by a predetermined distance d2 . The longitudinal length of the light guide plate including the light-incident portion 15b and the light-emitting portion 15a is formed to be equal to the sum of the extending lengths of the light-incident portion 15b and the light-emitting portion 15a.

A step corresponding to the difference in height between the height of the upper surface 152 of the light-incident portion 15b and the height 153 of the upper surface 153 of the light-emitting portion 15a is set at a point where the light-incident portion 15b and the light- .

At this time, at least a part of the fixing bracket 18 is brought into contact with the upper side 152 of the light-incident portion 15b, and the upper side 152 of the light-incident portion 15b is moved downward, The light guide plate 15 can be firmly fixed to the bottom cover 110 by pressing the light guide plate 15 toward the bottom cover 110. [

The stepped height h5 is equal to the height h4 of the other end 156 of the light emitting portion 15b or at least the same as the height h4 of the other end 156. [

As described above, the bottom surface of the light guide plate 15 is inclined upward from the light-incident portion 15b toward the light-emitting portion 15a.

Therefore, the thickness of the light emitting portion 15b is gradually decreased from the light-incident portion 15b to the light-emitting portion 15a.

When the height h4 of the other end 156 is greater than the height h1 of the light guide plate 15, the reflectance decreases as the angle of inclination of the lower surface of the light guide plate 15 decreases, The efficiency of light emission upward from the light emitting portion 15a is reduced.

Light which is not emitted through the upper surface 158 of the light emitting portion 15a leaks to another adjacent light guide plate 15 through the other end 156, thereby causing a light interference phenomenon. Therefore, the height h4 of the other end 156 of the light emitting portion 15a is smaller than or equal to the height h5 of the stepped portion.

On the other hand, when the height h1 of the incident surface 151 is smaller than the height h5 of the step, excess light is diffused in the process of traveling from the light-incident portion 15b to the light-emitting portion 15a , A darker portion than the surrounding portion is generated on one side of the light emitting portion 15a contacting with the light incident portion 15b. Therefore, the height h1 of the incident surface 151 is formed to be greater than or at least equal to the step height h5.

The relationship between the height h1 of the incident surface 151 and the height h5 and the relationship between the height h5 and the height h4 of the other end 156 of the light emitting portion 15a , The height h1 of the incident surface 151 may be equal to or greater than the height h4 of the other end 154 or at least the height h4 of the other end 154.

The vertical height h1 of the incident surface 151 of the light incident portion 15b is smaller than the vertical height h3 of one end of the light emitting portion 15a connected to the light incident portion 15b.

This is because the plurality of light beams incident on the light guide plate 15 from the plurality of light sources 13 in the light incident portion 15b are combined into one light beam, The light is diffused to a larger area as the light proceeds to one end of the light guide plate 15a.

The vertical height h4 of the front side end portion 155 of the light emitting portion 15a is equal to the height h1 of the incident surface 151 of the light incident portion 15b and the height h1 of the light emitting portion 15 at the upper and lower ends Direction height h3.

This is because the light incident through the incident surface 151 reduces the cross-sectional area of the light guide plate 15 in the up-and-down direction from the portion where the light is emitted upward in the light guide plate 15, So that it can be performed.

On the other hand, the fixing bracket 18 for fixing the light guide plate 15 to the bottom cover 110 is provided on one side of the light guide plate 15, that is, on the upper face side of the light entrance portion 15b. And the light guide plate 15 is fixed by pressing a part thereof toward the bottom cover 110 side.

The fixing bracket 18 is provided as a frame structure bent on the upper side, and may be formed of an injection-molded article made of synthetic resin or a metal material. A through hole 181 through which the fastening member 51 passes is formed on the bent upper side of the fixing bracket 18.

The light source 13 is provided in the inner space of the fixing bracket 18 in a state where the fixing bracket 18 is fixed to the bottom cover 110 by the fastening member 51. Therefore, light emitted from the light source 13 without passing through the light guide plate can be prevented from being directly emitted to the outside.

2 to 4, at least one of the light guide plates 15 of another optical assembly 10 adjacent to the optical assembly 10 is provided above the fixing bracket 18 of any one of the optical assemblies 10, Some of them may be provided in an overlapped state.

That is, on the upper side of the fixing bracket 18 and the light-incident portion 15b of one of the optical assemblies 10, at least a part of the light-emitting portion 15a of the adjacent optical assembly 10 is positioned, The assemblies 10 are provided so as to be overlapped with each other.

On the other hand, the display panel 210 may have a plurality of divided regions corresponding to the plurality of light guide plates 15, and may be provided from the light guide plate of the optical assembly 10 corresponding to the gray peak value or the color coordinate signal of the divided region The brightness of the emitted light, that is, the brightness of the light source is adjusted, so that the brightness of the display panel 210 can be adjusted.

Referring again to FIG. 4, a reflective member 17 for reflecting the light upward is provided on the bottom surface of the light guide plate 15.

The reflective member 17 may be provided as a reflective sheet coated with a reflective material on at least one surface thereof and having a reflectance of a predetermined size. The reflecting member 17 is formed on the other side of the reflecting region 171 and faces the bottom surface of the light guide plate 15. The reflecting member 171 has one side contacting the other side end 156 of the light guide plate 15, 14 for fixing the position where the reflective member 17 is provided. At this time, the position where the fixing region 173 is formed in the reflecting member 17 can be referred to as the rear side edge of the reflecting member 17, and the edge in the opposite direction of the rear side edge can be referred to as the front side It can be called border.

The extension length d7 of the reflection area 171 with respect to the first direction (y-axis direction) is equal to the extension length d3 of the bottom surface with respect to the first direction of the light guide plate 15, Is formed to be larger than the length (d3).

The extension width w2 of the reflective area 171 with respect to the third direction (x-axis direction) is equal to the extension width w1 of the light guide plate 15 with respect to the third direction, Is formed to be larger than the extension width w1.

The extension length d7 and the extension width w2 of the reflective region 171 are equal to the extension length d3 of the bottom face and the extension width w1 of the light guide plate 15, respectively.

When the extension length d7 and the extension width w2 of the reflection region 171 are formed to be larger than the extension length d3 of the bottom face and the extension width w1 of the light guide plate 15, The difference between the extension length d7 of the bottom surface and the extension length d3 of the bottom surface and the extension width w1 of the light guide plate 15 are the first spacing d6 and the second spacing d2, (d4).

The fixed region 173 is formed on the other side of the reflective region 171 and is formed in accordance with the position and shape corresponding to the plurality of light sources 13 and a plurality of light sources 13 are inserted, A fixing hole 171 for maintaining the position of the substrate 17 and a plurality of fixing holes 171 and a through hole 172 at a position corresponding to the through hole 142 of the substrate 14 do.

4 shows an extended reflective member 17a of the optical assembly 10 disposed in the central row C of the plurality of optical assemblies 10 and the extended reflective member 17a has a reflective region 171 And an extended region 172 formed on both sides of the left and right sides of the frame.

The non-elongated reflecting member 17b (see FIG. 6) is provided in the optical assembly 10 disposed in the other columns L and R except for the center column C, And does not include a separate extension region 172 different from the extension reflection member 17a.

At this time, the reflection region 171 disposed below the light guide plate 15 and overlapping the light guide plate 15 may be referred to as a first region, and the extended region 172 not overlapping the light guide plate 15 may be referred to as a second region have.

Hereinafter, the configuration of the extended reflection member 17b corresponding to the extended reflection member 17a and the extended reflection member 17a will be described in detail.

FIG. 5 is a view showing an extended reflection member according to the first embodiment of the present invention, and FIG. 6 is a view showing a non-extended reflection member according to the first embodiment of the present invention.

First, referring to Fig. 5, the elongated reflective member 17a further includes an extended region 172 as described above.

More specifically, in the extended reflection member 17a according to the present embodiment, the extended region 172 is provided on the left and right sides of the reflection region 171, respectively.

At this time, the extension width w3 of the one extension region 172 with respect to the third direction (x-axis direction) is formed at least larger than the second separation distance d4. In this embodiment, the extension width w3 may be 0.15 mm to 100 mm, for example.

That is, in the state where the reflective region 171 of the extended reflection member 17a is disposed on the bottom surface of the light guide plate 15, The extended regions 172, which are further extended by the width w3, protrude from the rim of the light guide plate 15 toward the outside of the rim. The extension regions 172 are exposed in the second direction (y-axis direction) through the second spacing d4.

As the extension width w3 of the extension region 172 in the third direction (x-axis direction) is larger than one second separation distance d4, The extended regions 172 of the member 17a overlap at least a part with the optical assembly 10 disposed in the left column L or the right column R of the center column C. [

At this time, the extension length of the extension regions 172 of the present embodiment extending in the first direction (y-axis direction) may be the same as the extension length of the reflection region 171 extending in the first direction.

The width of the extended reflection member 172 according to the present embodiment in the third direction is the sum of the extension width w2 of the reflective region 171 and the extension width w3 of the left and right extended regions w3 As shown in FIG.

6, the non-elongated reflecting member 17b according to the present embodiment does not include a separate elongated region 172 unlike the elongated reflecting member 17a as described above.

The width of the non-elongated reflecting member 17b with respect to the third direction is the same as the extending width w2 of the reflecting region 171. The left and right edges of the non- The first and second spacing d1 and d2 may be disposed in contact with the left and right edges of the first spacer 15 and at the second spacing d4.

7 is a plan view showing a state where an extended reflection member according to the first embodiment of the present invention is mounted on a light guide plate and a substrate.

7, the reflective region 171 of the elongated reflective member 17a is positioned on the bottom surface of the light guide plate 15 in a state in which the elongated reflective member 17a is mounted on the light guide plate 15 and the substrate 14 And overlaps with the light guide plate 15.

The elongated region 172 of the elongate reflective member 17a is extended by an extension width w3 of a predetermined size in the outward direction of the light guide plate 15 with respect to the rim of the light guide plate 15, As shown in Fig.

Hereinafter, the configuration in which the extension reflecting member 17a and the non-extension reflecting member 17b are disposed between each other will be described in detail.

8 is a cross-sectional view of the backlight unit according to the B-B diagram of FIG.

8, an extended reflection member 17a is provided on the bottom surface of the light guide plate 15 disposed at the C2 position of the light guide plate 15 disposed in the central row C, and the left column L and the right column R of the light guide plate 15 disposed at the positions of L2 and R2 among the light guide plates 15 disposed on the light guide plate 15 and the light guide plate 15, respectively.

At least a part of the elongated regions 172 of the elongated reflective member 17a disposed on the bottom surface of the light guide plate 15 of C2 is reflected by the reflective reflective region 171 of the elongated reflective member 17b disposed at L2 and R2 positions, And is overlapped with at least a part of the non-elongated reflecting member 17b.

That is, at least a part of the extension regions 172 is located below the edge portion of the light guide plate disposed at L2 and R2 positions.

The remaining part of the extended areas 172 is located at the second spacing d4 so that the light incident on the second spacing d4 along the rim of the light guide plate 15 travels in the second direction ).

At this time, a portion of the extended region 172 overlapping at least a part of the adjacent reflective member 17b is referred to as an overlap region 1721, and another portion of the extended region 172 not overlapped with the other reflective member 17b Overlapping area 1722. [0164]

The non-overlapping region 1722 is located at the second spacing d4 and is exposed in the first direction (y-axis direction), and the overlapping region 1721 is located below the other reflecting member 17b .

On the other hand, in order that the extended regions 172 of the elongated reflective member 17a disposed in the center row C can be positioned below the optical assembly 10 disposed in the left row L and the right row R, The optical assembly 10 disposed in the center row C may be installed in the backlight unit 100 and then the optical assembly 10 disposed in the left row L or the right row R may be installed.

Although three optical assemblies 10 are described as being arranged in the center column C, the left column L and the right column R, respectively, in the present embodiment, The configuration in which the elongated reflecting member 17a and the non-elongated reflecting member 17b are disposed may be changed depending on the arrangement of the optical assembly 10. In this case,

For example, when the first to fourth rows of optical assemblies 10 are disposed in the third direction (x-axis direction) in the backlight unit 100, the elongated reflective member 17a includes one elongated region 172 And an extended reflection member 17a is disposed in the optical assembly 10 of the first to third columns so that the extended region 172 of any one of the optical assemblies 10 is located in the reflective region of the other optical assembly 10. [ It is also possible that a configuration in which the non-extended reflection member 17b is disposed in the optical assembly 10 in the fourth row is also possible.

According to the present invention, a modular backlight unit including a plurality of light guide plates is used to provide light to a display panel, thereby reducing the thickness of a display device and thereby reducing local dimming or impulsive ) Can be used to improve the contrast of the display image.

And, there is an advantage that the reflective member of either optical assembly can be continuously reflected into the uniform light emitted from the plurality of optical assemblies as at least part of the reflective member overlaps with the other reflective member.

Further, deformation between the reflection members can be minimized as the mechanical interference between each other is minimized as at least a part of the overlapping reflection member is positioned below the other reflection member.

FIG. 9 is a cross-sectional view showing a backlight unit according to a second embodiment of the present invention, FIG. 10 is a perspective view showing the light guide plate and the extended reflection member of FIG. 9, FIG. 11 is a perspective view of the reflection member according to the second embodiment of the present invention, Fig.

Among the configurations of the backlight unit shown in Figs. 9 to 10, the description of the same configurations as those described with reference to Figs. 1 to 8 will be omitted.

9 and 10, the optical assembly 10 includes a light source 13, a light guide plate 15, a reflective member 17, and a side cover 20 for fixing the light source 13 and the light guide plate 15 And the like.

The side cover 20 provides a fixing position for the bottom cover 110 and is surrounded by a part of the light source 13 and the light guide plate 15 and accommodates the light source 13 in the inner space.

The side cover 20 includes a first side cover 21 disposed on the light source 13 and the light incident portion 15b of the light guide plate 15 and a second side cover 21 disposed on the lower side of the light incoming portion 15b. And may include a cover 22. The side cover 20 may be made of plastic or metal.

The first side cover 21 and the second side cover 22 are fastened to each other by the first fixing member 51 so that the light source 13 and the light guide plate 15 are not shaken by an external impact, Axis direction) can be prevented.

The second side cover 22 can support the inclined surface of the light guide plate 15 to firmly maintain alignment of the light guide plate 15 and the light source 13 and protect the light guide plate 15 and the light source 13 from external impacts.

Meanwhile, the light-incident portion 15b of the light guide plate 15 may include a protrusion 30 protruding at a predetermined height a. The protrusions 30 may be formed in at least two places in the third direction (x-axis direction) from the upper surface of the light-incident portion 15b of the light guide plate 15. [

The protrusion 30 may have various shapes, for example, a shape similar to a rectangular parallelepiped. The projection 30 can prevent the light guide plate 15 from swinging in the third direction and the first direction (x-axis and y-axis) by catching the first side cover 21.

A part 30a of the projection 30 may be formed in a round shape to prevent a crack from being generated in the projection due to the impact applied to the projection 30 by the movement of the light guide plate 15. [

On the other hand, the protrusion 30 may have a height a of 0.3 to 0.6 mm from the upper surface of the light-incident portion 15b. The width b of the projection 30 in the third direction (x-axis direction) may be 2 to 5 mm. The width c of the projection 30 in the first direction (y-axis direction) may be 1 to 3 mm.

The protrusions 30 may be disposed between the adjacent light emitting diodes 11 and may be formed in the vicinity of the light incidence surface 16 on the upper surface of the light incidence portion 15b so that light generated in the light emitting diodes 11 It is possible to prevent the occurrence of optical interference due to the protrusion 30 formed integrally with the optical fiber 15.

The light emitting diodes 11 may be arranged at predetermined intervals. The light emitting diodes 11 may be arranged diagonally with respect to the projections 30 in order to minimize the optical effect of the protrusions 30 formed on the light guide plate 15. [ The spacing of the light emitting diodes 11 around the projections 30 may be wider than the spacing of the other light emitting diodes 11. [

A space for coupling the first side cover 21 and the second side cover 22 is ensured and the light emitting diodes 11 are arranged in order to minimize the optical influence that may be caused by the pressing of the light guide plate 15 by the coupling force. The distance between some of the light emitting diodes 11 may be wider than the distance between the other light emitting diodes 11.

The first side cover 21 may be provided with a first hole 41 at a position corresponding to the projection 30 of the light incident portion 15b.

The first hole 41 may be larger than the projection 30 so that the projection 30 is engaged with the projection 30. The circumference of the first hole 41 may be spaced a predetermined distance from a part of the edge of the protrusion 30. The space may be formed in the light guide plate 15 when the light guide plate 15 expands due to a change in external environment, And may be a margin for preventing the deformation of the base 15. At this time, another portion of the projection 30 may contact the periphery of the first hole to enhance the fixing force.

At least one second hole (42) may be further formed in the first side cover (21). At least one third hole 43 may be formed in the second side cover 21 at a position corresponding to the second hole 42.

The backlight unit 100 having the above-described configuration can be housed in a box-shaped bottom cover 110 opened on the upper side.

The bottom surface of the bottom cover 110 on which the optical assembly 10 is mounted may be formed in a concave-convex structure along the back surface shape of the optical assembly 10.

For example, a structure including the light source 13, the light-incident portion 15b of the light guide plate 15, and the side cover 20 may be disposed on the depressed portion 110a of the bottom surface, The light emitting portion 15a of the light guide plate 15 may be disposed on the base portion 110b. The depression 110a and the protrusion 110b may be alternately arranged in succession.

The bottom cover 110 having such a shape can be manufactured by a process such as press molding or extrusion molding.

The shape of the depressions 110a and the protrusions 110b depends on the size and appearance of the optical assembly 10 and the inclination angle of the bottom surface of the light guide plate 15 .

Further, the bottom cover 110 having a bottom surface formed in a concavo-convex structure as in the embodiment can be advantageous in maintaining its shape and maintaining rigidity.

In the same manner as in the first embodiment of the present invention, the reflecting member 17 is provided on the bottom surface of the light guide plate 15, and the optical assembly 10, The reflecting member 17 may be provided as an elongate reflecting member 17a or an elongated reflecting member 17b depending on whether it is installed in the center column C or the left and right rows L and R. [

However, since the non-elongated reflecting member 17b according to the present embodiment is substantially the same as the non-elongated reflecting member 17b according to the first embodiment, Will be described in detail.

9 and 11, the non-elongated reflecting member 17b according to the present embodiment has a reflection region 171 and a reflection region 171 on the left and right sides along the third direction (x-axis direction) And includes a fixed region 173 provided on the other side of the reflective region 171. [

A portion of the extended region 172 adjacent to the fixed region 173 in the extended region 172 is extended to the extended region 172 toward the rear edge of the non-extended reflecting member 17b, The inclined portion 176 is formed such that the extension width w3 of the protruding portion 174 is reduced.

The portion where the inclined portion 176 starts in the elongated region 172 is eccentric to the rear side of the reflective member 17 among the extended length d9 of the elongated region 172 with respect to the first direction As shown in FIG.

At this time, the interference avoiding distance d10 from the rear edge of the reflecting member 17 to the portion where the inclined portion 176 starts is set so that the supporting portion 22a of the lower side cover 22 (see FIG. 11) Direction (y-axis direction).

The extended width w3 of the extended region 172 corresponding to the interference avoiding distance d10 is smaller than the extended width w3 of the other portion so that the elongated reflecting member 17a disposed in the central row C, Can be prevented from interfering with the second side cover 22 of the optical assembly 10 disposed in the left and right rows L and R. [

The end point of the inclined portion 176 according to the present embodiment is described as being formed at a position where the fixed region 173 and the reflective region 171 are in contact with each other. It is also possible that it is possible to be formed at any one point of the region 173 or on the rear edge of the reflective member 17. [

In this case, when the end point of the inclined portion 176 is formed at a position where the fixed region 173 and the reflective region 171 are in contact with each other, the extended region 172 is in contact with the fixed region 173 and the reflective region 171 To the point.

The extension region 172 corresponds to the fixed region 173 when the point at which the slope portion 176 is terminated is located at either one of the fixed regions 173 or on the rear edge of the reflective member 17 Or to the rear edge of the reflective member 17. [0060]

It is also possible that a separate inclined portion 176 is not formed in the extended region 172 but the extended region 172 is extended to a point corresponding to one of the fixed regions 173.

Hereinafter, the configuration of the side cover 20 will be described in detail.

Fig. 12 is a view showing the side cover of Fig. 9. Fig.

Referring to FIG. 12, the side cover 20 is formed in a shape to cover at least a part of the light guide plate 15 and the light source 13.

The side cover 20 includes a first side cover 21 disposed on the light source 13 and the upper portion of the light incident portion 15b and a second side cover 22 disposed on the lower portion of the light incoming portion 15b can do. And. The side cover 20 may be made of plastic or metal.

More specifically, the first side cover 21 is formed to face the upper surface of the light-incident portion 15b. The first side cover 21 may be formed by bending the first side cover 21 in the second direction (z-axis line) so as to face the incident surface 16 on the upper surface of the light-

The second side cover 22 is formed to face the lower surface of the light-incident portion 15b. The second side cover 22 may be formed by bending the second side cover 22 in the second direction (z-axis line) so as to face the incident surface 16 at the lower surface of the light-incident portion 15b. The supporting portion 22a of the second side cover 22 may extend in a first direction (y-axis direction) so as to be inclined along a lower surface of the light guide plate 15, that is, a part of the inclined surface, The light source 13 can be housed.

The support portion 22a supports the bottom surface of the light guide plate 15 and at least a part of the reflection member 17 in the second direction (z-axis direction).

The first side cover 21 and the second side cover 22 are fastened to each other by the first fixing member 51 so that the light source 13 and the light guide plate 15 are not shaken by an external impact, z-axis direction) can be prevented.

The second side cover 22 supports an inclined surface of the light guide plate 15 to firmly maintain alignment of the light guide plate 15 and the light source 13 and can protect the light guide plate 15 from external impacts.

A first hole 41 may be formed in the first side cover 21 at a position corresponding to the projection 30 of the light-incident portion 15b.

The first hole 41 may be larger than the projection 30 so that the projection 30 is engaged with the projection 30. At this time, the periphery of the first hole 41 may be spaced a predetermined distance from a part of the edge of the protrusion 30, and the spacing space may be formed by the light guide plate 15, It may be a margin for preventing deformation of the light guide plate 15 at the time. At this time, another part of the projection 30 may contact the periphery of the first hole 41 to enhance the fixing force.

At least one second hole 42 may be further formed in the first side cover 21 and at least one third hole 42 may be formed in the second side cover 21 at a position corresponding to the second hole 42. [ (43) may be formed.

The second and third holes 42 and 43 are arranged in a straight line in the first direction (z-axis direction), and the first fixing member 51 is inserted into the first side cover 21 and the second side cover 22 can be firmly fixed. In order to secure the fixing force, at least two pairs of the second and third holes 42 and 43 may be formed in one optical assembly 10. The second hole 42 and the third hole 43 may be formed at any position of the first side cover 21 and the second side cover 22, respectively.

Although the second and third holes 42 and 43 are described as holes formed in the present embodiment, at least a part of the fixing member may be inserted to fix the first and second side covers will be. Thus, the second and third holes 42, 43 may be referred to as first and second inserts formed into holes or grooves.

The first and second side covers 21 and 22 may be referred to as an upper cover and a lower cover, respectively.

The second hole 42 in the first side cover 21 may be disposed in a straight line with the first hole 41 in the first direction (y-axis direction). In this case, the coupling force between the light guide plate 15 and the first side cover 21 by the first hole 41 and the protrusion 30 of the light guide plate 15, the second and third holes 42 and 43, The first side cover 21 and the second side cover 22 may be more firmly fixed by the coupling force between the first side cover 21 and the second side cover 22 by the member 51. [

Of course, the positions of the holes and the protrusions are not limited thereto, and any position may be used as long as it can provide a bonding force between the light guide plate 15 and the side cover 20. [ That is, the second hole and the third hole are formed in the overlapping side portions of the first side cover 21 and the second side cover 22, respectively, so that the fixing member is inserted in the first direction (y-axis direction) Configuration is also possible.

10) through which the optical assembly 10 is fixed to the bottom cover 110 is passed through the first side cover 21 and the second side cover 22, (44) and a fifth hole (45).

The remaining portion of the optical assembly 10 excluding the light emitting portion 15a of the light guide plate 15 is a first region that does not substantially provide light to the display panel and includes a first hole 41, The width of the first area may be further reduced by the arrangement relationship of the third holes 43. [

For example, when the second hole 42 and the third hole 43 are disposed between the light emitting diodes 11, the width of the first region is smaller than that of the light emitting diode 11, .

The first hole 41, the second hole 42, and the third hole 43 formed in the side cover 20 of the optical assembly 10 may have various shapes, It is not.

The first fixing member 51 may be a screw or a fixing pin, but is not limited thereto.

When the first fixing member 51 is a screw, the inner side surfaces of the second and third holes 42 and 43 are formed with arcs and valleys along thread lines. The first fixing member 51 is inserted into the second hole 42 and the third hole 43 and rotated so that the light guide plate 15 and the light source 13 sandwiched therebetween can be tightened.

The first and second side covers 21 and 22 are formed in the second hole 42 and the third hole 43 so as to secure the pitch of the screw thread formed on the inner side surfaces of the second hole 42 and the third hole 43. [ The thickness of the peripheral portion 43 may be thicker than the other portions, or a separate member may be used.

Meanwhile, as described above, a plurality of holes 43 and 45 for fixing are formed on one side of the second side cover 22, and a supporting portion 22a is formed on the other side.

The width of one side of the second side cover 22 extending in the third direction (x-axis direction) is formed by the first extension width w4, and the width of the other side of the second side cover 22 is formed by the width 2 extension width w5.

At this time, the first extension width w4 is formed to be larger than the second extension width w5. The first extension width w4 is set such that the extension width w1 of the light guide plate 15 in the third direction (x-axis direction) and the extension width w1 of the reflection area 171 in the third direction And may be formed to be equal to the extension width w2.

That is, with the plurality of optical assemblies 10 according to the present embodiment being disposed in the backlight unit 100, the second side cover 22 of any one of the optical assemblies 10 and the optical assembly 10 The spacing between the second side covers 22 of the adjacent optical assemblies 10 is the smallest at one side of the second side cover 22 formed by the first extending width w4, Is formed to be the largest at the other side of the second side cover (22) formed by the second extending width (w5).

In the present embodiment, it is explained that the width gradually decreases from one side of the second side cover 22 toward the other side.

That is, the extension width w3 of the portion corresponding to the interference avoiding distance d10 in the extended region 172 of the elongated reflecting member 17a disposed on the central row C side is one direction, The extension width of the second side cover 22 is reduced toward the other direction, for example, toward the + y axis direction. It is therefore possible to prevent contact and mutual interference between the extended region 172 of one of the optical assemblies 10 and the second side cover 22 of another optical assembly 10 adjacent to the optical assembly 10 have.

In addition, the second side cover 22 is not formed to have a gradually decreasing extension width toward the other direction, but may be configured to be stepwise reduced.

According to the proposed embodiment, as the light source 13, the substrate 14 and the light guide plate 15 are integrally combined by the side cover 22 to constitute one optical assembly 10, And the assembled optical assembly 10 is disposed in the backlight unit 100, the production of the backlight unit 100 can be facilitated.

13 to 16 are views showing a state where an extended reflection member according to the third to sixth embodiments of the present invention is mounted on the light guide plate and the substrate.

The optical assembly according to the present embodiments is different from the first embodiment shown in Figs. 1 to 7 only in the configuration of the elongated reflecting member, Explain.

13, the extension length d7 of the elongated reflective member 17a with respect to the first direction (y-axis direction) according to the third embodiment of the present invention is smaller than the elongated length d7 with respect to the first direction of the light guide plate 15 Is formed to be larger than the extension length (d3) of the bottom surface.

Therefore, unlike the extended reflection member 17a according to the first embodiment, the second extended region 178 is provided on the other side of the reflective region 171, that is, on the side opposite to the side where the fixed region 173 and the reflective region 171 meet, Is formed. At this time, the extended region 172 of the extended reflection member 17a according to the first embodiment may be referred to as a first extended region.

The second extended region 178 does not overlap with the light guide plate 15 like the first extended region 172. [ However, in the state where the plurality of optical assemblies 10 are provided in the backlight unit 100, the first extended region 172 is located at the second spacing distance d4, Is located at the first spacing d6 that intersects the second spacing d4.

The length of the second extended region 178 with respect to the first direction (y-axis direction) is equal to the extending length d7 (y-axis direction) of the reflective region 171 and the second extended region 178 with respect to the first direction And the extension length d3 of the light guide plate 15 with respect to the first direction.

That is, the first extended region 171 is extended in the third direction with respect to the rim intersecting the third direction (x-axis direction) of the rim of the light guide plate 15, Is further extended in the first direction with respect to the rim of the light guide plate (15) intersecting with the first direction (y-axis direction).

The second extended region 178 overlaps with at least a part of the light guide plate 15 of the adjacent optical assembly 10 and is positioned above the adjacent light guide plate 15, ).

In this case, the first extended region 172 and the second extended region 178 may be referred to as the first region. In this case, the first extended region 172 and the second extended region 178 may be referred to as the light guide plate 15, Can be referred to as the second area that does not overlap with the second area.

14, the extension length of the remaining portion of the elongated reflective member 17a except for the fixed region 173 with respect to the first direction (y-axis direction) Is formed to be smaller than the extension length with respect to the first direction.

Therefore, a part of the bottom surface of the light guide plate 15 overlaps with the reflection area 171, and the rest does not overlap with the reflection area 171.

15, the extended reflection member 17a according to the present embodiment includes a pair of extended regions 172 disposed on the left and right sides of the reflection region 171, Unlike the extended reflection member 17a according to the present embodiment, the extended region 172 is formed only on one side of the left and right sides of the reflection region 171. [

More specifically, the extension region 172 according to the present embodiment may have the second spacing d4 at one of the left and right edges of the reflective region 171 adjacent to the second spacing d4. As shown in Fig.

In the state where the plurality of optical assemblies 10 are provided in the backlight unit 100, the extended reflection member 17a is provided in a state in which a separate non-extended reflection member 17b is not provided unlike the first embodiment, May be provided in a shape in which at least a part of the other elongated reflective member 17a is overlapped with at least a part of the adjacent elongate reflective member 17a.

16, the elongated reflecting member 17a according to the present embodiment is arranged such that the elongated reflecting member 17a according to the first embodiment is fixed to the light source 13 and the substrate 14 And does not include a separate fixed area 173, unlike the fixed area 173.

Accordingly, the extended reflection member 17a according to the present embodiment is at least partially mounted on at least one member of the substrate 14, the bottom cover 110, and the second cover 22, The support of the extended reflection member 17a can be performed by being pressed downward by the bottom surface of the light guide plate 15. [

17 to 22 are sectional views of a backlight unit according to seventh through twelfth embodiments of the present invention. Sectional view of the backlight unit according to Figs. 17 to 22 of the seventh to twelfth embodiments corresponds to Fig. 8 of the first embodiment cut along the B-B diagram of Fig.

The present embodiment is different from the first embodiment only in the difference between the configuration of the reflective member 17 and the reflective member 17 disposed on the bottom surface of the light guide plate 15, The description is omitted, and the characteristic parts of the embodiments are mainly described.

17, a backlight unit 100 according to a seventh exemplary embodiment of the present invention includes a light guide plate 15 disposed at a position C2 of a light guide plate 15 disposed in a central row C, A second elongate reflective member 17a is provided on the bottom surface of the light guide plate 15 disposed at L2 and R2 positions of the light guide plate 15 disposed in the left column L and the right column R, 17c.

More specifically, the first extended reflection member 17a is formed such that the width w3 of the extended region 172 with respect to the third direction is larger than the second spacing d4 like the extended reflection member 17a of the first embodiment And are provided on both left and right sides of the reflection region 171 in a pair.

The second extended reflecting member 17c includes the extended region 172 like the first extended reflecting member 17a. At this time, the extension width w3 of the extended region 172 of the second elongated reflecting member 17c with respect to the third direction (x-axis direction) Unlike the extension width w3 in the three directions, is smaller than the second gap d4.

The extension regions 172 of the second extension reflection member 17c are provided on both sides of the reflection region 171 on the left and right sides in the third direction (x-axis direction) like the first extension reflection member 17a.

Therefore, the extended region 172 of the first elongated reflecting member 17a and the elongated region 172 of the second elongated reflecting member 17c according to the present embodiment overlap at least partially with each other at the second gap d4 do.

18, a first extended reflection member 17A provided in the central row C of the backlight unit 100 according to the eighth embodiment of the present invention and a second extended reflection member 17B provided in the left column L and the right column At least a part of the second elongated reflecting member 17C provided in the second lens R, that is, the elongated region 172, are overlapped with each other at the second gap d4.

Unlike the seventh embodiment, the extension width w3 of the extended region 172 of the first extended reflection member 17A with respect to the third direction (x-axis direction) is smaller than the second spacing d4 .

Therefore, the extended region 172 of the first elongate reflecting member 17A and the elongated region 172 of the second elongate reflecting member 17C overlap only the second gap d4.

Since the other configurations of this embodiment are the same as those of the seventh embodiment, detailed description of the configuration is omitted.

19, the backlight unit 100 according to the ninth embodiment of the present invention includes one extended area (not shown) on the bottom surface of the light guide plate 15 disposed in the left column L and the right column R And a third elongate reflecting member 17d including only the second elongated reflecting member 176. [

That is, in the backlight unit 100 according to the present embodiment, the left and right edges of the third elongate reflective member 17d along the third direction (x-axis direction) extend in the rim adjacent to the second gap d4 A region 172 is formed, and a separate extended region 172 is not formed in the remaining frame.

The extended region 172 of the third extended reflecting member 17d disposed at the position L2 of the left column L is formed at the right edge of the third extended reflecting member 17d adjacent to the second gap d4 And an extended region 172 of the third elongate reflecting member 17d disposed at the R2 position of the right column R is formed on the left edge of the third elongate reflecting member 17d.

Since the configuration of the backlight unit 100 according to the present embodiment is the same as that of the seventh embodiment except for the configuration of the third elongate reflecting member 17d described above, a detailed description thereof will be omitted.

20, the backlight unit 100 according to the tenth embodiment of the present invention includes a non-elongated reflecting member 17b (see FIG. 20) provided on the bottom surface of the light guide plate 15 disposed at the C2 position in the center row C And a fourth extended reflection member 17e provided on the bottom surface of the light guide plate 15 disposed in the left column L and the right column R. [

More specifically, the extension width w3 of the extended region 172 of the fourth extended reflection member 17e with respect to the third direction (x-axis direction) is formed to be larger than the width of the second gap d4. An extended region 172 is formed on the rim adjacent to the second gap d4 among the left and right rims along the third direction (x-axis direction) of the fourth extended reflection member 17e, and the remaining rim A separate extension region 172 is not formed.

The extension region 172 of the fourth extended reflection member 17e disposed at the position L2 of the left column L is formed at the right edge of the fourth extended reflection member 17e adjacent to the second gap d4 And the extended region 172 of the fourth extended reflection member 17e disposed at the R2 position of the right column R is formed on the left edge of the fourth extended reflection member 17e.

At least a part of the extended region 172 of the fourth extended reflecting member 17e overlaps with the non-extended reflecting member 17 on the central row C side.

21, the backlight unit 100 according to the eleventh embodiment of the present invention includes a fourth elongate reflecting member 17e and a right elongated member R arranged on the left side L and the center row C, And a non-elongated reflecting member 17b disposed on the other side.

The extended region 172 of the fourth extended reflection member 17e disposed on the left side L side is the fourth extended reflection member 17e on the side of the center row C adjacent to the left side L side, Is overlapped with at least a part of the reflection area 171 of the reflection area 171.

The extended region 172 of the fourth extended reflection member 17e disposed on the side of the center column C is disposed at least in the reflection region 171 of the non-extended reflection member 17b disposed on the right- It overlaps with a part.

The configuration of the backlight unit 100 according to the embodiment of the present invention is such that the fourth elongated reflecting member 17e is disposed on the left side L and the center row C side, The configuration of the backlight unit 100 according to the ninth embodiment is substantially the same as that of the backlight unit 100 according to the ninth embodiment, and a detailed description thereof will be omitted.

22, the backlight unit 100 according to the twelfth embodiment of the present invention includes an extended region 172 (see FIG. 22) disposed on the left and right edges around the reflective region 171, And extending widths w31 and w32 with respect to a third direction (x-axis direction) of the first extended reflection member 17f.

At this time, the extension widths w31 and w32 of the extended region 172 are formed to be larger than the size of the second gap d4.

The non-elongated reflecting member 17a is disposed in the left column L and the right column R and at least a part of the reflecting region 171 of the non- And at least a portion of the extension region 172 of the base portion.

23 to 26 are sectional views of a backlight unit according to the thirteenth to sixteenth embodiments of the present invention.

The thirteenth through sixteenth embodiments of the present invention are different from the first embodiment in that the light guide plate 15 is disposed in the left, right and center rows L, R, and C, The light guide plate 15 is disposed on the right side and the first and second central columns L, R, C1, and C2, i.e., a total of four columns. Hereinafter, the characteristic parts of the embodiments will be mainly described.

23, the backlight unit 100 according to the thirteenth embodiment of the present invention includes a second extended reflection member 17c on the bottom surface of the light guide plate 15 only in one of the four rows, And the sixth extended reflection member 17g is provided on the bottom surface of the light guide plate 15 in the remaining rows R, C1, and C2.

More specifically, the second elongate reflecting member 17c includes a pair of elongated regions 172 formed at an extension width smaller than the second distance d as described above, and the L2 of the left column L The light guide plate 15 is provided on the bottom surface thereof.

On the other hand, the sixth extended reflection member 17g includes a pair of extended regions 172 and is disposed in the first and second central columns C1 and C2 and the right column R. [ At this time, the extending width of one of the extended regions 172 of the sixth extended reflection member 17g formed at different widths is formed to be larger than the second spacing d4, The extension width of the extension region 172 is formed to be smaller than the second gap d4.

The extended region 172 of the sixth extended reflection member 17g adjacent to the C11 position of the first central row C1 has a larger extension width than the second spacing d4 At least a part of which overlaps with at least a part of the second elongate reflecting member 17c provided at the position L2 in the left column L.

The sixth extended reflection members 17g provided at the positions of C11 of the first central column C1, C12 of the second central column C2 and R2 of the right column R are at least partially overlapped with each other , Thereby preventing a part of the bottom cover 110 from being exposed in the second direction (z-axis direction) through the second gap d4.

24, the backlight unit 100 according to the fourteenth embodiment of the present invention includes a non-extended reflecting member 17b disposed in the left column L and a right column R, And a sixth elongated reflecting member 17g which is distributed to the central column C1 and the second central column C2.

25, the backlight unit 100 according to the fifteenth embodiment of the present invention includes a non-elongate reflecting member 17b disposed in the left column L and a right column R, A fourth extended reflecting member 17e disposed on the side of the center column C1 and including one extended region 172 overlapping at least a part of the non-extended reflecting member 17b on the left column L side, Two extension regions 17a and 17b which are disposed on the second central row C2 side and overlap at least part of the fourth extended reflection member 17e and at least a part of the non-extended reflection member 17b on the right row R side And a first elongate reflective member 17a including a second elongate member 172 and a second elongate member 17a.

26, the backlight unit 100 according to the sixteenth embodiment of the present invention includes a non-elongate reflecting member 17b disposed in the left column L, a first and a second central column C1 And a fourth extended reflecting member 17e disposed on the right side R and including one extended region 172 overlapping at least a part of another adjacent reflecting member.

1 is an exploded perspective view showing a configuration of a display device according to a first embodiment of the present invention;

FIG. 2 is a sectional view showing the configuration of a display module according to the A-A diagram of FIG. 1; FIG.

3 is a plan view schematically showing a configuration of a backlight unit;

4 is an exploded perspective view showing an optical assembly according to a first embodiment of the present invention;

5 is a view showing an extended reflection member according to a first embodiment of the present invention;

6 is a view showing a non-extended reflecting member according to the first embodiment of the present invention.

7 is a plan view showing a state where an extended reflection member according to the first embodiment of the present invention is mounted on a light guide plate and a substrate.

FIG. 8 is a cross-sectional view of the backlight unit according to the B-B diagram of FIG. 3; FIG.

9 is a sectional view showing a backlight unit according to a second embodiment of the present invention;

10 is a perspective view showing the light guide plate and the extended reflection member of FIG. 9;

11 is a plan view showing a reflective member according to a second embodiment of the present invention;

Figure 12 shows the top and bottom covers of Figure 9;

13 is a view showing a state where an extended reflection member according to a third embodiment of the present invention is mounted on a light guide plate and a substrate.

14 is a view showing a state where an extended reflection member according to a fourth embodiment of the present invention is mounted on a light guide plate and a substrate.

15 is a view showing a state where an extended reflection member according to a fifth embodiment of the present invention is mounted on a light guide plate and a substrate.

16 is a view showing a state where an extended reflection member according to a sixth embodiment of the present invention is mounted on a light guide plate and a substrate.

17 is a sectional view of a backlight unit according to a seventh embodiment of the present invention.

18 is a sectional view of a backlight unit according to an eighth embodiment of the present invention.

19 is a sectional view of a backlight unit according to a ninth embodiment of the present invention.

20 is a sectional view of a backlight unit according to a tenth embodiment of the present invention;

21 is a sectional view of a backlight unit according to an eleventh embodiment of the present invention.

22 is a sectional view of a backlight unit according to a twelfth embodiment of the present invention.

23 is a sectional view of a backlight unit according to a thirteenth embodiment of the present invention.

24 is a sectional view of a backlight unit according to a fourteenth embodiment of the present invention;

25 is a sectional view of a backlight unit according to a fifteenth embodiment of the present invention.

25 is a sectional view of a backlight unit according to a sixteenth embodiment of the present invention.

Claims (33)

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  11. Bottom cover;
    A substrate accommodated in the bottom cover;
    A plurality of light sources arranged on the substrate and having a predetermined directivity angle around a first direction to emit light;
    A light incident portion including an incident surface through which light is incident in a first direction from the plurality of light sources, and a light emitting portion that is emitted in a second direction in which the incident light intersects the first direction, A plurality of light guide plates including a plurality of light guide portions;
    At least one reflective member including a reflective region overlapping with one of the plurality of light guide plates and an extended region not overlapping with the light guide plate;
    An optical sheet disposed on the upper side of the light guide plate; And
    And a cover which surrounds a part of an upper surface of the light-incident part and a part of a lower surface of the light guide plate, and the light source is accommodated in an inner space,
    The cover
    A first cover covering at least a part of an upper surface of the substrate on which the light sources are disposed; And
    And a second cover covering at least a part of a lower surface of the substrate,
    Wherein the light sources are disposed on one side of the second cover,
    Wherein an extension width of the one side of the second cover with respect to a third direction intersecting with the first direction and the second direction is larger than an extension width of the other side of the second cover Larger than the extension width for the three directions,
    Wherein an extension width in the third direction at any one point of the extension region is greater than an extension width in the third direction at another point in the extension region that is spaced apart by a certain distance in a direction opposite to the first direction at the one point. Larger than the extension width,
    The one point of the extended region corresponds to the other side of the second cover, the other point of the extended region corresponds to the one side of the second cover,
    Wherein at least a part of the extended region is disposed so as to face the gap between any one of the light guide plates and the one of the light guide plates and the other light guide plate adjacent to the third direction.
  12. 12. The method of claim 11,
    Wherein the reflective member is formed parallel to a plane defined by the third direction and the first direction.
  13. 12. The method of claim 11,
    Wherein at least a part of one of the light guide plates is located above at least a part of another light guide plate adjacent to the light guide plate.
  14. 12. The method of claim 11,
    Wherein the extended region of the reflective member positioned below one of the light guide plates overlaps with the reflective region of the reflective member positioned below another light guide plate adjacent to the light guide plate.
  15. 12. The method of claim 11,
    And at least a part of the extended region of any one of the reflection members is located below the reflection region of another reflection member adjacent to the reflection member.
  16. 12. The method of claim 11,
    And the reflective region faces the bottom surface of the light guide plate.
  17. 12. The method of claim 11,
    Wherein the extended region extends outside the rim of the light guide plate and is exposed in the second direction.
  18. delete
  19. 12. The method of claim 11,
    And at least a part of the cover is fixed to the bottom cover.
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  22. 12. The method of claim 11,
    Wherein the plurality of divided driving regions are divided into a plurality of divided driving regions corresponding to the plurality of light guide plates, and each of the divided driving regions has a luminance adjusted in accordance with luminance or color coordinate signals of a video signal.
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KR1020090124164A 2009-12-14 2009-12-14 optical assembly, backlight unit having the same, and display apparatus thereof KR101676872B1 (en)

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KR1020090124164A KR101676872B1 (en) 2009-12-14 2009-12-14 optical assembly, backlight unit having the same, and display apparatus thereof

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Application Number Priority Date Filing Date Title
KR1020090124164A KR101676872B1 (en) 2009-12-14 2009-12-14 optical assembly, backlight unit having the same, and display apparatus thereof
EP20100015492 EP2354817A1 (en) 2009-12-14 2010-12-09 Backlight unit, and display apparatus including the backlight unit
US12/966,202 US8674929B2 (en) 2009-12-14 2010-12-13 Optical assembly, backlight unit including the same, and display apparatus including the backlight unit
CN201010625008.9A CN102102833B (en) 2009-12-14 2010-12-14 backlight unit and display apparatus including the backlight unit

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