KR20130058935A - Back light unit - Google Patents

Back light unit Download PDF

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Publication number
KR20130058935A
KR20130058935A KR1020110124945A KR20110124945A KR20130058935A KR 20130058935 A KR20130058935 A KR 20130058935A KR 1020110124945 A KR1020110124945 A KR 1020110124945A KR 20110124945 A KR20110124945 A KR 20110124945A KR 20130058935 A KR20130058935 A KR 20130058935A
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KR
South Korea
Prior art keywords
reflector
guide plate
light guide
light emitting
light
Prior art date
Application number
KR1020110124945A
Other languages
Korean (ko)
Inventor
이한구
김병구
안진형
Original Assignee
금호전기주식회사
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 금호전기주식회사 filed Critical 금호전기주식회사
Priority to KR1020110124945A priority Critical patent/KR20130058935A/en
Publication of KR20130058935A publication Critical patent/KR20130058935A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/34—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/02—Function characteristic reflective

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

Abstract

PURPOSE: A backlight unit is provided to prevent light loss from a light emitting diode by including a reflection portion in the backlight unit. CONSTITUTION: At least one LED(Light Emitting Diode)(220) is mounted in the upper part of a PCB[Printed Circuit Board](210). A reflection portion(230) includes at least one opening portion which corresponds to the LED. A side reflection portion(240) is extended from both side parts which correspond to the reflection portion. A light guide plate(250) is arranged in the upper part of the reflection portion and comprises an upper surface(251), a lower surface(252), and multiple side surfaces(253,254).

Description

Backlight Unit

The present invention relates to a backlight unit.

Recently, a liquid crystal display using an LED backlight unit using a light emitting diode (LED) as a light source instead of a fluorescent lamp has been introduced, which can realize high luminance and color reproducibility compared to a conventional fluorescent lamp. It is excellent for displaying video and does not require inverter, which is essential for fluorescent lamps, and shows the advantage that the backlight driving circuit can be simplified.

In general, the backlight unit may be classified into a side light type or a direct light type according to the position of the light source. In the former type, the light emitted from the light emitting diode may be formed by a light guide plate (LGP). The light is incident on one side and refracts the light toward the liquid crystal panel, and the latter direct type supplies light to the front of the liquid crystal panel by directly arranging a light source to the rear of the light guide plate.

1 is a cross-sectional view illustrating a conventional backlight unit.

Referring to FIG. 1, in the conventional backlight unit 100, a reflector 130 for reflecting light emitted from the light emitting diodes 120 to the liquid crystal panel 180 is attached to the lower cover 140. Then, the light emitting diodes 120 are mounted on the printed circuit board 110 again, and the light guide plate 150 is sequentially loaded.

Since the light emitting diodes 120 face the light guide plate 150, the light emitted from the light emitting diodes 120 naturally flows into the light guide plate 150 to emit light.

However, the light emitting diode has a problem that the luminance of light incident on the liquid crystal display panel is more non-uniform than that of a conventional fluorescent lamp (CCFL, etc.).

In addition, since all light emitting diodes and fluorescent lamps (CCFL, etc.) are emitted in all directions except for the electrode part, the light incident on the liquid crystal display panel has a problem of low luminance.

In order to solve the above problems, an object of the present invention is to provide a backlight unit including a reflector for scattering or diffusing light to make it uniform and preventing light loss.

The light emitting diode provided as a backlight unit is mounted on a circuit board to reduce the thickness of the backlight unit, to form an opening through which the light emitting diode is exposed on the printed circuit board, and the corresponding two sides of the reflector are extended to extend the side reflector. The present invention provides an LED backlight unit capable of increasing reflection efficiency.

In addition, by providing a backlight unit that can provide a high brightness and even uniformity for each application by adjusting the height of the reflector side portion and the diameter of the opening according to the use of the backlight unit.

In order to achieve the above object, according to the present invention, at least one light emitting diode is mounted on a printed circuit board, the reflecting portion having at least one opening corresponding to the at least one light emitting diode, and the corresponding two sides of the reflecting portion It extends to form a side reflector, and provides a backlight unit including a light guide plate disposed on the reflector.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

According to the present invention, by applying the reflector to the backlight unit, the light loss of the light emitting diode is prevented from occurring, thereby improving the light efficiency.

1 is an exploded perspective view of a liquid crystal display device having a general backlight unit.
2 (a) and 2 (b) are a cross-sectional view and an exploded perspective view of a backlight unit according to a temporary embodiment of the present invention.
3 is a cross-sectional view of a backlight unit according to another exemplary embodiment of the present invention.
4 is a cross-sectional view of a backlight unit according to another exemplary embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

The present invention is not limited to the following examples unless departing from the gist of the present invention.

2 (a) is a cross-sectional view of the backlight unit according to an embodiment of the present invention, Figure 2 (b) is an exploded perspective view of the backlight unit.

As shown in the drawings, the backlight unit of the present invention may include a printed circuit board 210, a light emitting diode 220, a reflector 230, a side reflector 240, and a light guide plate 250. Can be.

At least one light emitting diode 220 is disposed on a printed circuit board 210 having a wiring circuit formed on one surface thereof, and when a plurality of light emitting diodes 220 are disposed, the light emitting diodes 220 may be arranged and arranged in various ways. Can be.

The printed circuit board 210 may apply a voltage to the light emitting diodes 220 through electrical connection means such as a wiring circuit, and may be made of a material having good thermal conductivity. For example, FR-4 and CEM-3 , Al, Cu, stainless steel, ceramic, phenol, epoxy, Teflon and the like, or may be made of an alloy.

The light emitting diodes 220 are mounted on a printed circuit board 210 in a chip-on-board type or a packaging type, and are supplied with power and connected in series, parallel, or in parallel to emit light. It may be configured in combination, or may be used to form white light by combining various light emitting diodes such as a blue light emitting diode or a UV light emitting diode.

A plurality of openings 260 may be formed in the reflector 230, and each of the plurality of openings 260 is formed in a region corresponding to the light emitting diodes 220, and has a circular shape and a quadrangular shape according to a use purpose. It may be formed in various forms such as shape, hexagonal shape, and the like.

One side portion of the reflector 230 extends to form a first side reflector 241, and the other side portion corresponding to one side extends to form a second side reflector 242 to form a side reflector 240. Can be configured.

In addition, the reflector 230 may have a rectangular shape having four sides, and at this time, the side reflector 240 may extend on each of the four sides. (Not shown)

The side reflector 240 may be formed to be orthogonal to the reflector 230 or may be inclined to have a predetermined opening angle θ according to a use purpose.

According to the purpose of the backlight unit, the height of the side reflector 240 and the diameter of the opening 260 of the reflector 230 may be adjusted to provide a backlight unit capable of providing high luminance and even uniformity for each application. .

The reflector 230 and the side reflector 240 are made of a highly reflective metal such as Sn, Al, Ag, or by injection molding a plastic material, for example, PC, PCABS, PPA, nylon, PET, PBT, or the like. A material that can be formed may be used, and materials having excellent reflectivity may be coated on the surfaces of the reflector 230 and the side reflector 240 to improve reflection efficiency. For example, the coating layer having excellent reflectivity may be made of white powder such as TiAl, CrAl, ZrAl, TiO 2 , Al 2 O 3, or a mixture thereof.

In the present exemplary embodiment, the light guide plate 250 may have an upper surface, a lower surface, and a rectangular parallelepiped formed in a plurality of side surfaces connecting the upper surface and the lower surface. At this time, the upper or lower surface of the light guide plate may be a light exit surface.

In the present embodiment, the light guide plate 250 may be disposed such that one side thereof corresponds to the reflector. That is, the light emitting diode 220 is disposed at a portion corresponding to one side of the light guide plate 250, and the light incident from the light emitting diode element 220 to the light guide plate 250 is applied to the optical characteristics of the light guide plate 250. The light emitting plate 250 may be emitted to the upper surface 251 or the lower surface 252 of the light guide plate 250.

The distance between the first side reflector 241 and the second side reflector 242 of the side reflector 240 is between the top surface 251 and the bottom surface 252 of the light guide plate 250, depending on the intended use and purpose. It can be greater than or equal to the distance.

Here, the distance between the first side reflector 241 and the second side reflector 242 means a distance between an end of the first side reflector 241 and an end of the second side reflector 242. . That is, when the distance between the end of the first side reflector 241 and the end of the second side reflector 242 is greater than the thickness of the light guide plate 250, the light guide plate 250 is disposed between the side reflector 241. Because this can be fitted.

Although the width of the reflector 230 is shown as being larger than the thickness of the light guide plate 250 in the drawing, the width of the reflector 230 may be smaller than the thickness of the light guide plate 250. In this case, the distance between the end portions of the side reflector 240 may be adjusted to be equal to or greater than the thickness of the light guide plate 250 by adjusting the opening angle of the side reflector 240.

Preferably, the space between the reflector 230 and the light guide plate 250 is maximized by the first side reflector 241 and the second side reflector 242 to minimize light loss. It may be a structure.

An end portion of the first side reflector 241 and an end portion of the second side reflector 242 may be formed higher than an upper portion of the light emitting diode 220 mounted on the printed circuit board 210. An end portion of the first side reflector 241 and an end portion of the second side reflector 242 may be positioned at a point where one end surface 253 of the light guide plate 250 faces the reflector 230. . In this way, the space between the reflector 230 and the light guide plate 250 is maximized by the first side reflector 241 and the second side reflector 242, thereby minimizing light loss.

By providing the reflector 230 as in the present invention, light from the light emitting diodes 220 is diffused or reflected to prevent light loss and to one side 253 of the light guide plate 250 facing the reflector 230. It can supply light.

3 is a cross-sectional view of a backlight unit according to another embodiment of the present invention.

As shown in FIG. 3, the backlight unit of the present exemplary embodiment may include a printed circuit board 310, a light emitting diode 320, a reflector 330, a side reflector 340, and a light guide plate 350. have.

At least one or more light emitting diodes 320 are disposed on a printed circuit board 310 having a wiring circuit formed on one surface thereof, and when a plurality of light emitting diodes 320 are disposed, the light emitting diodes 320 may be arranged in various ways. Can be.

The printed circuit board 310 may apply a voltage to the light emitting diode 320 through an electrical connection means such as a wiring circuit, and may be made of a material having good thermal conductivity. For example, FR-4 and CEM-3 , Al, Cu, stainless steel, ceramic, phenol, epoxy, Teflon and the like, or may be made of an alloy.

The light emitting diode 320 is mounted on a printed circuit board 310 as a chip-on-board type or a packaging type, and is supplied with power and connected in series, parallel, or in parallel to emit light. The light emitting diodes, the blue light emitting diodes, the UV light emitting diodes, or the like may be used in combination with various light emitting diodes to form white light.

A plurality of openings (not shown) may be formed in the reflective part 330, and each of the plurality of openings (not shown) may be formed in an area corresponding to the light emitting diode 320, and may have a circular shape according to a use purpose. It may be formed in a variety of forms, such as rectangular, hexagonal.

One side portion of the reflector 330 extends to form a first side reflector 341, and the other side portion corresponding to one side extends to form a second side reflector 342 to form a side reflector 340. Can be configured.

In addition, the reflector 330 may have a rectangular shape having four sides, and at this time, the side reflector 340 may extend on each of the four sides. (Not shown)

The side reflector 340 may be formed in a direction orthogonal to the reflector 330 or beveled to have a predetermined opening angle θ according to a use purpose.

According to the purpose of the backlight unit, the height of the side reflector 340 and the diameter of the opening (not shown) of the reflector 330 may be adjusted to provide a backlight unit capable of providing high luminance and even uniformity for each use. have.

According to the purpose of the backlight unit, the height of the side reflector 340 and the diameter of the opening (not shown) of the reflector 330 may be adjusted to provide a backlight unit capable of providing high luminance and even uniformity for each use. have.

The reflector 330 and the side reflector 340 are made of a highly reflective metal such as Sn, Al, Ag, or by injection molding a plastic material, for example, PC, PCABS, PPA, nylon, PET, PBT, or the like. A material that can be formed may be used, and materials having excellent reflectivity may be coated on the surfaces of the reflector 330 and the side reflector 340 to improve reflection efficiency. For example, the coating layer having excellent reflectivity may be made of white powder such as TiAl, CrAl, ZrAl, TiO 2 , Al 2 O 3, or a mixture thereof.

In the present embodiment, the light guide plate 350 may have an upper surface, a lower surface, and a rectangular parallelepiped formed with a plurality of side surfaces connecting the upper surface and the lower surface. At this time, the upper surface 351 of the light guide plate 350 may be a light exit surface.

In the present exemplary embodiment, the light guide plate 350 may be disposed such that the bottom surface 352 corresponds to the reflector 330. That is, the light emitting diode 320 is disposed at a portion corresponding to the lower surface 352 of the light guide plate 350, and the light incident from the light emitting diode element 320 to the light guide plate 350 is optically generated by the light guide plate 350. By the characteristic, it may be emitted to the upper surface 351 of the light guide plate 350.

The distance between the first side reflecting portion 341 and the second side reflecting portion 342 of the side reflecting portion 340 may vary between the first side 353 and the second side ( 354) may be greater than or equal to.

Here, the distance between the first side reflector 341 and the second side reflector 342 means a distance between an end of the first side reflector 341 and an end of the second side reflector 342. .

That is, when the distance between the end of the first side reflector 341 and the end of the second side reflector 342 is greater than the width of the light guide plate 350, the light guide plate 350 is disposed between the side reflector 340. Because this can be fitted.

Although the width of the reflector 330 is larger than the width of the light guide plate 350 in this drawing, the width of the reflector 330 may be smaller than the width of the light guide plate 350.

In this case, the distance between the end portions of the side reflector 340 may be adjusted to be equal to or greater than the width of the light guide plate 350 by adjusting the opening angle of the side reflector 340.

Preferably, the space between the reflector 330 and the light guide plate 350 is maximized by the first side reflector 341 and the second side reflector 342 to minimize light loss. It may be a structure.

An end portion of the first side reflector 341 and an end portion of the second side reflector 342 may be formed higher than an upper portion of the light emitting diode 320 mounted on the printed circuit board 310. An end portion of the first side reflection portion 341 and an end portion of the second side reflection portion 342 may be positioned at a point where the end surface of the light guide plate 350 intersects the bottom surface 352. In this way, the space between the reflector 330 and the light guide plate 350 is maximized by the first side reflector 341 and the second side reflector 342, thereby minimizing light loss. .

By providing the reflector 330 as in the present invention, the light emitted from the light emitting diode 320 is diffused or reflected to prevent light loss, and the light is directed to the lower surface 352 of the light guide plate 350 facing the reflector 330. Can be supplied.

4 is a cross-sectional view of a backlight unit according to another embodiment of the present invention.

The backlight unit according to the present embodiment includes a printed circuit board 410, an insulating adhesive material 470, a light emitting diode 420, a reflector 430, a side reflector 440, and a light guide plate 450. Can be configured.

At least one or more light emitting diodes 420 are disposed on a printed circuit board 410 having wiring circuits formed on one surface thereof, and a plurality of light emitting diodes 420 are arranged to be arranged in various ways. Can be.

The printed circuit board 410 may apply a voltage to the light emitting diode 420 through an electrical connection means such as a wiring circuit, and may be made of a material having high thermal conductivity. For example, FR-4 and CEM-3 , Al, Cu, stainless steel, ceramic, phenol, epoxy, Teflon and the like, or may be made of an alloy.

Since the conventional backlight unit uses a machined printed circuit board, liquid solder mask ink (PSR) is applied on the printed circuit board for insulation and reflection.

In the present exemplary embodiment, the reflective portion 430 may be adhered by applying an insulating adhesive material 470 onto a printed circuit board (ceramic substrate) to which the liquid solder mask ink PSR is not applied. Therefore, there is no need to go through a separate liquid solder mask ink (PSR) coating process, which simplifies the entire process, and does not use the conventional liquid solder mask ink (PSR), thereby reducing the cost.

The insulating adhesive material 470 is required to be electrically insulated and adhered to the material, and heat resistance to withstand the heat generated by the light emitting diode 420 itself is required.

The insulating adhesive material 470 is a thermoplastic resin having high heat resistance, such as polyethylene resin, polypropylene resin, polyester resin, polyamide resin, acrylic resin, vinyl chloride resin, celluloid resin, polyimide resin (PI), and LCP (Liquid Crystal). Polymer), Teflon (PTFE), Rubber, etc., and these may be used alone or in combination of two or more. Preferred high heat-resistant thermoplastics include PI, LCP, PTFE, Rubber, and the like.

Thermosetting resins that can be preferably used in combination with the high heat resistance thermoplastic resin include phenol resins, urea resins, melanin resins, alkyd resins, silicone resins, epoxy resins, urethane resins or mixtures thereof.

The light emitting diodes 420 are mounted on a printed circuit board 410 in a chip-on-board type or a packaging type, and are supplied with power and connected in series, parallel, or in parallel to emit light. Or a combination of various light emitting diodes, such as a blue light emitting diode or a UV light emitting diode, to form white light.

A plurality of openings (not shown) may be formed in the reflective part 430, and each of the plurality of openings (not shown) may be formed in an area corresponding to the light emitting diode 420, and may have a circular shape according to a use purpose. It may be formed in a variety of forms, such as rectangular, hexagonal.

One side portion of the reflector 430 extends to form a first side reflector 441, and the other side portion corresponding to one side extends to form a second side reflector 442 to form a side reflector 440. Can be configured.

In addition, the reflector 430 may have a rectangular shape having four sides, and at this time, the side reflector 440 may extend on each of the four sides. (Not shown)

The side reflector 440 may be formed in a direction orthogonal to the reflector 430 according to a use purpose, or may be inclined to have a predetermined opening angle θ.

According to the purpose of the backlight unit, the height of the side reflector 440 and the diameter of the opening of the reflector 430 may be adjusted to provide a backlight unit capable of providing high luminance and even uniformity for each application. Can be.

The reflector 430 and the side reflector 440 are made of a highly reflective metal such as Sn, Al, Ag, or formed by injection molding a plastic material, for example, PC, PCABS, PPA, nylon, PET, or PBT. A material capable of using the same may be used, and materials having excellent reflectivity may be coated on the surfaces of the reflector 430 and the side reflector 440 to improve reflection efficiency. For example, the coating layer having excellent reflectivity may be made of white powder such as TiAl, CrAl, ZrAl, TiO 2 , Al 2 O 3, or a mixture thereof.

In the present exemplary embodiment, the light guide plate 450 may have an upper surface, a lower surface, and a rectangular parallelepiped formed in a plurality of side surfaces connecting the upper surface and the lower surface.

By providing the insulating adhesive material 470 and the reflecting portion 430 as in the present invention, the effect of simplifying the overall process and reducing the cost and diffusing or reflecting the light emitted from the light emitting diode 420 to prevent light loss and reflecting portion Light may be supplied to the light guide plate 450 opposite to 430 and applied to the backlight unit.

The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. Without departing from the gist of the invention claimed in the claims, it is intended that any person skilled in the art to which the present invention pertains falls within the scope of the claims described in the present invention to various extents which can be modified.

200: backlight unit 210: printed circuit board
220: light emitting diode 230: reflecting unit
240: side reflector 250: light guide plate
251: upper surface of the light guide plate 252: lower surface of the light guide plate
253: light guide plate side 470: insulating adhesive material

Claims (10)

Printed circuit board;
At least one light emitting diode mounted on the printed circuit board;
A reflector having at least one opening corresponding to the at least one light emitting diode;
Side reflectors extending from two corresponding sides of the reflector;
And a light guide plate disposed on the reflective part, the upper and lower surfaces facing each other, and a plurality of side surfaces connecting the upper and lower surfaces. The method of claim 1,
At least one opening of the reflector is a backlight unit of a circular shape, a square shape or a hexagon. The method of claim 1,
The reflector has four sides, and the side reflector is formed on all four sides of the backlight unit. The method of claim 1,
The side reflector is formed higher than the upper portion of the at least one light emitting diode mounted. 5. The method of claim 4,
And the side reflector is positioned at a point that intersects one surface of the light guide plate facing the reflector. The method of claim 1,
And one side of the light guide plate corresponds to the reflective part. The method according to claim 6,
The distance between the side reflector is greater than or equal to the distance between the upper surface and the lower surface of the light guide plate. The method of claim 1,
And a bottom surface of the light guide plate corresponds to the reflector. The method of claim 8,
And a distance between the side reflectors is greater than or equal to a distance between opposite sides of the light guide plate. The method of claim 1,
The backlight unit further comprises an insulating adhesive material applied between the printed circuit board and the reflecting portion.
KR1020110124945A 2011-11-28 2011-11-28 Back light unit KR20130058935A (en)

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KR1020110124945A KR20130058935A (en) 2011-11-28 2011-11-28 Back light unit

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Application Number Priority Date Filing Date Title
KR1020110124945A KR20130058935A (en) 2011-11-28 2011-11-28 Back light unit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160044137A (en) * 2014-10-14 2016-04-25 엘지디스플레이 주식회사 Light array and backlight unit including there of

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160044137A (en) * 2014-10-14 2016-04-25 엘지디스플레이 주식회사 Light array and backlight unit including there of

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