KR20170080994A - Optical sheet set and back light unit for display device having the same - Google Patents

Optical sheet set and back light unit for display device having the same Download PDF

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Publication number
KR20170080994A
KR20170080994A KR1020150191440A KR20150191440A KR20170080994A KR 20170080994 A KR20170080994 A KR 20170080994A KR 1020150191440 A KR1020150191440 A KR 1020150191440A KR 20150191440 A KR20150191440 A KR 20150191440A KR 20170080994 A KR20170080994 A KR 20170080994A
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KR
South Korea
Prior art keywords
blocking layer
optical sheet
light
light blocking
disposed
Prior art date
Application number
KR1020150191440A
Other languages
Korean (ko)
Inventor
황혜현
이영은
김원희
Original Assignee
엘지디스플레이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020150191440A priority Critical patent/KR20170080994A/en
Publication of KR20170080994A publication Critical patent/KR20170080994A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors

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

Abstract

The present invention relates to an optical sheet capable of reducing occurrence of wrinkles on an optical sheet and a backlight unit for a display device including the optical sheet.
The backlight unit for a display device according to the present invention includes a light blocking layer disposed on an edge portion adjacent to a light source and includes an optical sheet on which a force acts between the light blocking layer and an intermediate supporting member such as a guide panel or a light guide . Thus, a gap can be given between the optical sheet and the light source, and the occurrence of wrinkles on the optical sheet can be reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an optical sheet and a backlight unit for a display device including the optical sheet.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit for a display device, and more particularly, to a backlight unit for a display device capable of reducing light leakage and wrinkling of a light source.

The present invention also relates to an optical sheet usable in the above-described backlight unit for a display device.

Examples of the display device include a plasma display panel device, a liquid crystal display device, and an organic light emitting diode (OLED) display device.

Among them, the liquid crystal display device is a device for expressing a predetermined image by controlling transmission and blocking of light using a liquid crystal having optical anisotropy.

The liquid crystal of the liquid crystal display device can not emit light by itself and can not implement color by itself. Accordingly, a color filter for controlling the transmission and blocking of light is disposed on the front surface of the liquid crystal panel including the liquid crystal, and a backlight unit for supplying light to the liquid crystal panel is disposed on the rear surface of the liquid crystal panel.

The backlight unit includes a light source such as a cold cathode fluorescent lamp, an LED lamp, and the like. Further, the backlight unit includes various optical sheets such as a diffusion sheet, a light condensing sheet, a protective sheet and the like in order to process the light emitted from the light source. These optical sheets are located on the back surface of the liquid crystal panel and are located in the traveling direction of light generated from the light source.

Depending on the position of the light source of the backlight unit, it is divided into a direct lower type and an edge type. In the case of the edge type, a light guide plate is required in which the light source is located at one side edge of the backlight and guides the light forward.

1 is an example of a general edge type backlight unit.

1, the illustrated edge type backlight unit includes a light source 101, a light guide plate 130 disposed on a side surface of the light source, a reflection plate 140 disposed on the back surface of the light guide plate, (110, 120).

The light source 101, the light guide plate 130, and the reflection plate 140 are supported by a bottom cover 150. The optical sheets 110 and 120 are supported by an intermediate support member 160 such as a guide panel or a light guide.

At this time, a light blocking layer 210 is disposed on the edge of the light guide plate 130 or the optical sheet 110 closest to the light source 101 among the optical sheets 110 and 120. The light blocking layer 210 prevents direct light leakage by the light source 101 not through the light guide plate 130 to obtain uniform light.

Referring to FIG. 1, in the case of the optical sheet 110 closest to the light guide plate or the light source of the optical sheet, the optical sheet 110 is relatively long in length and has a light blocking layer disposed thereon, .

Fig. 2 shows an example of an optical sheet on which a light blocking layer is disposed.

Referring to FIG. 2, the light blocking layer 210 is generally disposed at one side edge of the optical sheet 110.

The light blocking layer 210 is formed by a method of printing and drying ink containing mainly a black pigment on one side edge of the optical sheet 110 and drying it.

3 schematically shows that the optical sheet is wrinkled while being sandwiched between the light source and the light guide plate.

As in the example shown in Fig. 3, the optical sheet 110 is often sandwiched between the light source 101 and the light guide plate 130, and this phenomenon may occur due to various causes as follows.

When the ratio of the width of the light source 101 to the thickness of the light guide plate 130 is out of the predetermined range, interference often occurs between the light blocking layer 210 and the light source 101, And the light guide plate 130, as shown in FIG.

In addition, the optical sheet 110 can not be fixed properly during the assembling process of the backlight unit, so that the optical sheet 110 can be sandwiched between the light source 101 and the light guide plate 130.

In addition, the optical sheet 110 may be sandwiched between the light source 101 and the light guide plate 130 in the course of the optical sheet 110 contracted at a high temperature being rotated at room temperature.

As described above, when the optical sheet 110 is sandwiched between the light source 101 and the light guide plate 130, the optical sheet 110 is wrinkled. The generated wrinkles cause a deterioration in optical characteristics of the optical sheet.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a backlight unit for a display device which can reduce the occurrence of wrinkles on an optical sheet compared to the related art.

Another object of the present invention is to provide an optical sheet suitable for the backlight unit for a display device.

According to an aspect of the present invention, a backlight unit for a display device includes a light source, a light guide plate, a reflection plate, at least one optical sheet, a bottom cover, and an intermediate support member.

The light guide plate is disposed on the side surface of the light source. The reflector is disposed on the back surface of the light guide plate. The at least one optical sheet is disposed on the front surface of the light guide plate and spaced apart from the light guide plate. The bottom cover supports the light source and the reflector. The intermediate support member supports the optical sheet, and is fastened to the bottom cover.

At least one of the optical sheets is provided with a light blocking layer at an edge portion adjacent to the light source, and attraction is exerted between the light blocking layer and the intermediate supporting member.

As described above, an attraction force acts between the light blocking layer disposed on the edge portion of the optical sheet adjacent to the light source and the intermediate support member positioned on the opposite side of the optical sheet reference light source, A gap is provided between the sheet and the light source.

This gap can prevent the optical sheet from being sandwiched between the light source and the light guide plate, and therefore, it is possible to reduce the occurrence of the wrinkles of the optical sheet caused by the optical sheet being sandwiched between the light source and the light guide plate.

At this time, the light blocking layer may include magnet particles, and the intermediate support member may be made of a magnetic material.

When the light blocking layer contains magnetic particles, it is preferable that the intermediate supporting member such as a guide panel or a light guide is made of a magnetic material such as steel, for example, which is capable of exerting attractive force with such magnet particles.

Further, magnetic particles may be included in the light blocking layer, and a magnetic pad may be disposed in the intermediate support member.

For example, when the intermediate support member such as a guide panel or a light guide is made of a non-magnetic material such as aluminum or plastic, attraction force with the intermediate support member can not be exerted merely by including magnet particles in the light blocking layer.

However, when the magnetic pad is disposed in the intermediate support member, attraction force can act between the light blocking layer containing the magnet particles and the magnetic pad of the intermediate support member.

Further, magnetic particles may be included in the light blocking layer, and a magnet pad may be disposed on the intermediate support member.

The light blocking layer may contain magnetic particles such as Fe powder. In this case, when the magnetic pad is disposed on the intermediate support member, attraction force can act between the light blocking layer containing the magnetic particles and the magnet pad of the intermediate support member.

On the other hand, the optical sheet on which the light blocking layer is disposed may be longer than other optical sheets.

In the case of the light blocking layer, the light leaked directly from the light source is blocked without passing through the light guide plate. The length of the optical sheet on which the light blocking layer is disposed is made relatively longer than other optical sheets, The light can be effectively blocked.

Further, the optical sheet on which the light blocking layer is disposed may be an optical sheet closest to the light guide plate.

The optical sheet closest to the light guide plate is mainly sandwiched between the light source and the light guide plate. Therefore, attraction force acts between the light blocking layer of the optical sheet closest to the light guide plate and the intermediate support member, so that the sticking of the optical sheet closest to the light guide plate between the light source and the light guide plate can be reduced.

According to another aspect of the present invention, a backlight unit for a display device includes a light source, an optical sheet, a bottom cover, and an intermediate support member.

One or more optical sheets are disposed on the front surface of the light source and spaced apart from the light source. The bottom cover supports the light source. The intermediate support member supports the optical sheet and is fastened to the bottom cover.

At least one of the optical sheets is provided with a light blocking layer at an edge portion, and attraction force acts between the light blocking layer and the intermediate supporting member.

In the case of this embodiment, it is a so-called direct-type backlight structure in which optical sheets are disposed on the entire surface of the light source. Also in this embodiment, the light blocking layer is disposed at the edge of the optical sheet to prevent the light leakage in the vicinity of the intermediate support member, and the optical blocking layer is disposed by the attraction force between the light blocking layer and the intermediate supporting member, A gap between the sheet and the light source can be given.

An optical sheet according to an embodiment of the present invention for solving the above problems includes a base film and a light blocking layer. The base film may be various optical films. The light blocking layer is disposed at an edge portion of the base film.

At this time, the light blocking layer includes magnet particles or magnetic particles.

When such an optical sheet is applied to a backlight unit for a display device, a force may be applied between the optical sheet and the intermediate support member depending on the material of the intermediate support member or the pad attached thereto.

The backlight unit for a display device according to the present invention includes a light blocking layer disposed on an edge portion adjacent to a light source and includes an optical sheet on which a force acts between the light blocking layer and an intermediate supporting member such as a guide panel or a light guide .

As a force acts between the light blocking layer of the optical sheet and the intermediate support member, a gap can be given between the optical sheet and the light source. Therefore, it is possible to reduce the occurrence of wrinkles in the optical sheet, which is a problem in the related art.

1 is an example of a general edge type backlight unit.
Fig. 2 shows an example of an optical sheet on which a light blocking layer is disposed.
3 schematically shows that the optical sheet is wrinkled while being sandwiched between the light source and the light guide plate.
4 shows a backlight unit for a display device according to an embodiment of the present invention.
5 shows an example of an optical sheet including magnet particles in the light blocking layer.
6 schematically shows that when a light blocking layer comprises magnetic particles and an intermediate supporting member is a magnetic material, a force is applied between the light blocking layer and the intermediate supporting member to provide a gap between the optical sheet and the light source.
7 shows a backlight unit for a display device according to another embodiment of the present invention.
8 schematically shows that when a light blocking layer contains magnetic particles and a magnetic pad is disposed on the intermediate supporting member, a force is applied between the light blocking layer and the intermediate supporting member to give a gap between the optical sheet and the light source .
9 shows a backlight unit for a display device according to another embodiment of the present invention.

Hereinafter, various embodiments of an optical sheet and a backlight unit for a display device including the optical sheet according to the present invention will be described with reference to the drawings.

The terms including ordinals such as first, second, etc. in the following can be used to describe various elements, but the constituent elements are not limited by such terms. These terms are used only to distinguish one component from another.

Also, in the present invention, the expression " is in a state of being in contact with another part "means not only" in which part is in contact with another part, On top of other parts in the state of being further formed in the middle ".

Fig. 4 shows a backlight unit for a display device according to an embodiment of the present invention, and shows an example of an edge-type backlight unit structure.

The backlight unit according to the present invention is mainly applicable to a liquid crystal display device, but is not limited thereto, and can be applied to other display devices requiring a backlight unit.

4, the illustrated backlight unit for a display device includes a light source 101, a light guide plate 130, a reflection plate 140, one or more optical sheets 110 and 120, a bottom cover 150, 160).

The light source 101 may be an LED package.

The light guide plate 130 is disposed on the side surface of the light source 101.

The reflection plate 140 is disposed on the back surface of the light guide plate 130.

One or more optical sheets 110 and 120 are disposed on the front surface of the light guide plate 130 and spaced apart from the light guide plate 130. The optical sheets 110 and 120 may be a transparent sheet, a diffusion sheet, a prism sheet protective sheet, or the like.

The bottom cover 150 supports the light source 101, the light guide plate 130, and the reflection plate 140.

The intermediate support member 160 supports the optical sheets 110 and 120 and is fastened to the bottom cover 150. The intermediate support member 160 may be a guide panel, a light guide, a cover shield, a middle cabinet, or the like.

At this time, in the case of the present invention, the light blocking layer 410 is disposed in at least one of the optical sheets 110 and 120. The light blocking layer 410 may be disposed at an edge portion (lower edge of FIG. 4) adjacent to the light source 101. Further, the light blocking layer 410 may be formed on only one side of the optical sheet, and may be formed on both sides of the optical sheet. The light blocking layer 410 prevents direct light leakage by the light source 101 not through the light guide plate 130, and consequently contributes to obtaining a uniform surface light.

In particular, in the case of the present invention, an attractive force acts between the light blocking layer 410 of the optical sheet 110 and the intermediate support member 160. This attraction can be achieved by including a magnet material in either one of the light blocking layer 410 and the intermediate support member 160 and a magnetic material in the other.

As described above, the light blocking layer 410 disposed on the edge portion of the optical sheet 110 adjacent to the light source 101 and the intermediate support member 410 located on the opposite side of the light source 101 with respect to the optical sheets 110 and 120, A gap is provided between the optical sheet 110 and the light source 101 on which the light blocking layer 410 is disposed.

This gap can prevent the optical sheet 110 from being caught between the light source 101 and the light guide plate 130. Therefore, it is possible to reduce the occurrence of the wrinkles of the optical sheet, which is generated when the optical sheet is sandwiched between the light source and the light guide plate.

5 shows an example of an optical sheet in which magnetic particles or magnetic particles are contained in the light blocking layer.

Referring to FIG. 5, a light blocking layer 410 is disposed on one side of the optical sheet 110.

The light blocking layer 410 includes magnet particles or magnetic particles.

The light blocking layer 410 may be formed by a known method such as printing and drying an ink composition containing a solvent, a binder and magnetic particles or magnetic particles on one side of the optical sheet. Further, when the magnetic particles or the magnetic particles can not perform the light shielding role, a separate black pigment or the like may be included in the ink composition.

The magnetic particles have properties to be attached to magnets. Representative examples of the magnetic particles include iron (Fe) such as carbon steel, stainless steel, silicon steel, permalloy and the like.

The magnet particles may be Alico magnet particles, ferrite magnet particles, samarium-cobalt magnet particles and neodymium magnet particles.

The following examples may be presented for attraction between the light blocking layer 410 of the optical sheet 110 and the intermediate support member 160.

First, the light blocking layer 410 may contain magnetic particles and the intermediate support member 160 may be made of a magnetic material.

When the light blocking layer 410 contains magnet particles, it is preferable that the intermediate support member 160 such as a guide panel or a light guide is made of a magnetic material such as steel, for example, capable of being attracted to the magnet particles.

6 schematically shows that when a light blocking layer includes magnetic particles and an intermediate supporting member is made of a magnetic material, a force is applied between the light blocking layer and the intermediate supporting member to give a gap between the optical sheet and the light source.

6, when a force is applied to the light blocking layer 410 including the magnet particles and the intermediate support member 160 made of a magnetic material, the light blocking layer 410 including the magnet particles acts on the intermediate support member 160, As shown in FIG. Therefore, a sufficient gap can be provided between the optical sheet 110 on which the light blocking layer 410 is disposed and the light source 101.

Further, the magnetic layer may include magnetic particles in the light blocking layer 410, and the pad 180 disposed on the intermediate support member 160 may be a magnetic material.

For example, when the intermediate support member 160 such as a guide panel or a light guide is made of a non-magnetic material such as aluminum, plastic, or the like, only magnet particles are included in the light blocking layer 410, Can not work. However, when the magnetic pad is disposed in the intermediate support member 160, an attractive force can act between the light blocking layer containing the magnet particles and the magnetic pad of the intermediate support member.

7, magnetic particles may be included in the light blocking layer 410, and a magnetic pad 710 may be disposed in the intermediate support member 160. In addition, as shown in FIG.

The light blocking layer 410 may include magnetic particles such as Fe powder. In this case, when the magnetic pad 710 is disposed on the intermediate support member, attraction force may act between the light blocking layer 410 containing the magnetic particles and the magnetic pad 710 of the intermediate support member 160.

8 schematically shows that when a light blocking layer contains magnetic particles and a magnetic pad is disposed on the intermediate supporting member, a force is applied between the light blocking layer and the intermediate supporting member to give a gap between the optical sheet and the light source .

8, when a light blocking layer 410 including magnetic particles and a light blocking layer 410 including magnetic particles due to a force acting on a magnetic pad 710 disposed on the intermediate supporting member 160 are in the middle It can be seen that it is slightly bent toward the support member 160. Therefore, even in the case of this example, a sufficient gap can be provided between the light source 101 and the optical sheet 110 on which the light blocking layer 410 is disposed.

6 and 8, a portion where the light blocking layer 410 is formed on the optical sheet 110 by the attraction force of the light blocking layer 410 and the intermediate supporting member 160 is formed on the intermediate supporting member 160, As shown in FIG. However, in this case, the warpage is not a problem because the thickness of the optical sheet is very thin, about 200 to 400 mu m, and the entire portions of the optical sheet are to be closely attached to the intermediate support member 160 by the magnetic attractive force .

Referring to FIG. 4, the optical sheet 110 having the light blocking layer may be longer than the other optical sheets 120.

In the case of the light blocking layer 410, the light blocking layer 410 shields the light directly emitted from the light source 101 without passing through the light guide plate 130. Therefore, the length of the optical sheet 110 in which the light blocking layer 410 is disposed is relatively longer than that of the other optical sheets 120, so that the light directly leaked from the light source 101 can be effectively blocked.

4, the optical sheet on which the light blocking layer 410 is disposed may be an optical sheet closest to the light guide plate 130.

The optical sheet 110 sandwiched between the light source 101 and the light guide plate 130 is the optical sheet 110 closest to the light guide plate 130. The attraction force between the light blocking layer 410 of the optical sheet 110 closest to the light guide plate 130 and the intermediate support member 160 acts on the light guide plate 130, Can be reduced.

9 shows a backlight unit for a display device according to another embodiment of the present invention, and shows an example of a direct-type backlight unit.

9, the illustrated backlight unit for a display device includes a light source 901, one or more optical sheets 930, a bottom cover 910, and an intermediate support member 920.

The one or more optical sheets 930 are disposed on the front surface of the light source 901 and spaced apart from the light source 901. A reflection plate may be disposed on the back surface of the light source 901.

The bottom cover 910 supports the light source 901. An intermediate support member 920 such as a guide panel or a middle cabinet supports the optical sheet 930 and is fastened to the bottom cover 910.

At this time, at least one of the optical sheets has a light blocking layer 940 disposed at an edge portion thereof, and a force acts between the light blocking layer 940 and the intermediate supporting member 920.

The light blocking layer 940 is disposed at the edge of the optical sheet 930 to prevent light leakage in the vicinity of the intermediate support member 920 in the direct type backlight unit structure as in this embodiment. A gap between the optical sheet on which the light blocking layer 940 is disposed and the light source 901 can be given by attraction between the light blocking layer 940 and the intermediate support member 920. [

As described above, the backlight unit for a display device according to the present invention includes an optical sheet having a light blocking layer disposed on an edge portion adjacent to a light source, wherein attraction force acts between the light blocking layer of the optical sheet and the intermediate supporting member A gap can be provided between the optical sheet and the light source, thereby reducing the occurrence of wrinkles in the optical sheet.

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is therefore to be understood that such changes and modifications are intended to be included within the scope of the present invention unless they depart from the scope of the present invention.

101, 901: Light source
110, 120, 930: optical sheet
130: light guide plate
140: Reflector
150, 910: bottom cover
160, 920: intermediate support member
210, 410, 940: light blocking layer
180, 710: Pad

Claims (8)

Light source;
A light guide plate disposed on a side surface of the light source;
A reflection plate disposed on a back surface of the light guide plate;
At least one optical sheet disposed on the front surface of the light guide plate and spaced apart from the light guide plate;
A bottom cover for supporting the light source, the light guide plate, and the reflection plate; And
And an intermediate support member that supports the optical sheet and is coupled to the bottom cover,
Wherein at least one of the optical sheets has a light blocking layer disposed at an edge portion adjacent to the light source, and attraction force acts between the light blocking layer and the intermediate supporting member.
The method according to claim 1,
Wherein the light blocking layer contains magnet particles,
Wherein the intermediate support member is made of a magnetic material.
The method according to claim 1,
Wherein the light blocking layer contains magnet particles,
And a magnetic pad is disposed on the intermediate support member.
The method according to claim 1,
Wherein the light blocking layer contains magnetic particles,
And a magnet pad is disposed on the intermediate support member.
The method according to claim 1,
Wherein the optical sheet on which the light blocking layer is disposed is longer than other optical sheets.
The method according to claim 1,
Wherein the optical sheet on which the light blocking layer is disposed is an optical sheet closest to the light guide plate.
Light source;
At least one optical sheet disposed on the front surface of the light source and spaced apart from the light source;
A bottom cover for supporting the light source; And
And an intermediate support member that supports the optical sheet and is coupled to the bottom cover,
At least one of the optical sheets has a light blocking layer disposed at an edge portion thereof,
Wherein attraction force acts between the light blocking layer and the intermediate support member.
A base film; And
And a light blocking layer disposed on an edge portion of the base film,
Wherein the light blocking layer comprises magnetic particles or magnetic particles.
KR1020150191440A 2015-12-31 2015-12-31 Optical sheet set and back light unit for display device having the same KR20170080994A (en)

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KR1020150191440A KR20170080994A (en) 2015-12-31 2015-12-31 Optical sheet set and back light unit for display device having the same

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KR20170080994A true KR20170080994A (en) 2017-07-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109581738A (en) * 2017-09-29 2019-04-05 夏普株式会社 Lighting device and display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109581738A (en) * 2017-09-29 2019-04-05 夏普株式会社 Lighting device and display device

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