KR20130025270A - Backlight assembly and liquid crystal display device having the same - Google Patents

Backlight assembly and liquid crystal display device having the same Download PDF

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Publication number
KR20130025270A
KR20130025270A KR1020110088686A KR20110088686A KR20130025270A KR 20130025270 A KR20130025270 A KR 20130025270A KR 1020110088686 A KR1020110088686 A KR 1020110088686A KR 20110088686 A KR20110088686 A KR 20110088686A KR 20130025270 A KR20130025270 A KR 20130025270A
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KR
South Korea
Prior art keywords
reflector
liquid crystal
light
guide
guide plate
Prior art date
Application number
KR1020110088686A
Other languages
Korean (ko)
Inventor
김선만
장현우
지병화
임주상
김용현
이효성
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020110088686A priority Critical patent/KR20130025270A/en
Publication of KR20130025270A publication Critical patent/KR20130025270A/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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • G02F1/133553—Reflecting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—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)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE: A back light assembly and a liquid crystal display including the same are provided to improve light efficiency by preventing light leakage in a light entry part. CONSTITUTION: A backlight assembly includes an LED assembly, a light guide plate(123), a guide panel(130), a lower cover(170), a reflecting plate(125), a reflector guide(150), and a housing reflector(127,129). The reflecting plate is arranged in the lower part of the light guide plate. The reflector guide supports the reflecting plate. The reflector guide has an optical absorption function.

Description

BACKLIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight assembly, and more particularly, to a backlight assembly having an improved optical characteristic and efficiency of a light incident part using a reflector guide, and a liquid crystal display device having the same.

In general, a liquid crystal display (LCD) is a device for displaying a desired image by adjusting the light transmittance of liquid crystal cells arranged in a matrix form according to image signal information. Form an image on the panel.

The liquid crystal display device using this principle has a tendency that its application range is gradually widening due to the characteristics of light weight, thinness, low power consumption, and the like.

In accordance with this trend, liquid crystal displays have been used in office automation equipment, audio / video equipment, and the like. In such a liquid crystal display, the amount of light transmitted is adjusted according to a signal applied to a plurality of control switches arranged in a matrix to display a desired image on a screen.

Recently, liquid crystal displays have been widely applied to not only computer monitors and televisions but also display devices of vehicle navigator systems and portable display devices such as laptops and mobile phones.

Most of the liquid crystal display devices as described above are non-emissive type display devices that display an image by controlling the amount of light source coming from the outside, so that the backlight including a separate light source for irradiating light to the liquid crystal display panel. You need an assembly (Backlight Unit).

In this case, the backlight assembly includes an LED which is a light source, a light guide plate coupled to the light exit surface of the LED, and a plurality of optical sheets provided on the light guide plate.

A liquid crystal display device having a conventional backlight assembly having such a configuration will be described below with reference to FIGS. 1 and 2.

1 is a cross-sectional view of a liquid crystal display having a backlight assembly according to the prior art.

FIG. 2 is a side cross-sectional view schematically illustrating a coupling state of a light guide plate and light absorbing members disposed in a liquid crystal display device having a backlight assembly of a liquid crystal display device according to the related art.

As shown in FIGS. 1 and 2, a liquid crystal display device having a backlight assembly according to the related art includes a liquid crystal panel 10 displaying an image and a backlight assembly 20 providing light to the liquid crystal panel 10. ), And a top cover 40 provided in a form surrounding the liquid crystal panel 10.

Although not shown in the drawing, the liquid crystal panel 10 includes a TFT array substrate (not shown), a color filter array substrate (not shown), and a liquid crystal layer (not shown) interposed therebetween. Polarizers (not shown) are attached to the outer side surfaces of the array substrate and the color filter array substrate, respectively.

In the liquid crystal panel 10, liquid crystal cells forming a pixel unit are arranged in a matrix form, and the liquid crystal cells form an image by adjusting light transmittance according to image signal information transmitted from a driver driving circuit (not shown).

In addition, one side of the liquid crystal panel 10 includes a driving driver (not shown) for driving unit pixels formed in the liquid crystal panel, and a flexible printed circuit board (FPCB) having one end connected to the liquid crystal panel. Not shown) is connected.

The backlight assembly 20 may include an LED assembly 60 arranged along a length direction of at least one edge of the guide panel 30, a white or silver reflecting plate 25 mounted on the bottom cover 70, and The light guide plate 23 mounted on the reflective plate 25 and a plurality of optical sheets 21 interposed thereon are included.

In this case, the LED assembly 60 is configured on one side of the light guide plate 23, and a plurality of LEDs 61 emitting white light, and a flexible printed circuit board (FPCB) to which the LED 61 is mounted 63).

The plurality of optical sheets 21 are used for diffusing and condensing light incident from the light guide plate 23. Although not illustrated, the plurality of optical sheets 21 may include diffusion sheets, prism sheets, and protective sheets.

Meanwhile, the light guide plate 23 is disposed along the side of the LED 61 and is disposed on the rear surface of the liquid crystal panel 10 to guide light generated from the LED 61 to the rear surface of the liquid crystal panel 10. do.

The guide panel 30 is configured in the form of a square frame surrounding the side portion of the light guide plate 23, and the liquid crystal panel 10 is disposed on one side of the upper surface of the guide panel 30.

In addition, a white reflector 29 is attached to the upper surface of the guide panel 30 for use in a housing, and the LED is in contact with the upper surface of the light incident part of the light guide plate 23. Black light-shielding tape on a portion where one end of the light guide plate 23 and the guide panel 30 abuts to block the light emitted from the 61 to leak between the light guide plate 23 and the interface between the guide panel 30. (31) is attached or a black absorber is applied.

In addition, the reflector 25 is provided below the light guide plate 23, and reflects a part of the light emitted from the lower part of the light guide plate 23 to the light exit surface (not shown) of the light guide plate 23 to increase light efficiency. In addition, the reflection amount of the entire incident light is adjusted so that the entire emission surface has a uniform luminance distribution.

In addition, the bottom cover 70 has a rectangular box shape with an open top, and includes a light guide plate 23 and a reflecting plate 25 wrapped by the guide panel 30 in the bottom cover 70. Components of the backlight assembly 20 are received.

The liquid crystal panel 10 and the backlight assembly 20 have a top cover 40 and a backlight assembly 20 covering the top edge of the liquid crystal panel 10 in a state where the edge is surrounded by the guide panel 30 having a rectangular frame shape. The bottom cover 70 covering the rear surface is coupled in front and rear, respectively, and integrated through the guide panel 30.

However, according to the liquid crystal display device having the backlight assembly according to the related art, as shown in FIG. 2, lens-shaped convex protrusions 23a are formed on the upper surface of the light guide plate 23 to increase reflection efficiency of light. A gap 35 is formed due to a contact step between the light blocking tape 31 or the absorber attached to a portion where one end of the light guide plate 23 and the guide panel 30 abut.

As a result, the light leaks out through the gap 35 generated between the light guide plate 23 and the light shielding tape 31, resulting in light loss.

Accordingly, the light leaks out through the gap 35 formed between the light guide plate 23 and the light blocking tape 31, thereby providing a liquid crystal display module (LCM) to which an edge type backlight is applied and a product such as a TV. In the process of developing a narrow bezzel, defects such as bright lines and light leakage occur in the light incident part.

In addition, the light emitted from the light incident part may leak through the gap generated between the light guide plate and the reflecting plate, so that a bright line may be generated in the light incident part.

On the other hand, although not shown in the drawings, a black absorber may be applied to the edge portion of the reflector disposed below the light guide plate, or a light absorbing tape may be attached to absorb the light.

However, in the case of applying the black absorber, there is a problem that the light shielding ink can be transferred to the light guide plate under environmental reliability conditions, and the manufacturing cost increases.

In addition, in the case of attaching the light shielding tape, the process time increases because it is difficult to attach the light shielding tape, and the light shielding tape may be pushed or dropped in the process of mounting the light guide plate on the reflector.

Accordingly, the present invention is to solve the problems of the prior art, an object of the present invention is to provide a backlight assembly and a liquid crystal display device having the same to prevent the bright line and light leakage of the light incident portion in the edge type backlight assembly and improve the efficiency In providing.

The backlight assembly according to the present invention for achieving the above object,

An LED assembly emitting light toward the liquid crystal panel;

A light guide plate disposed adjacent to the LED assembly;

A guide panel surrounding the LED assembly and the light guide plate;

A lower cover accommodating the LED assembly and the light guide plate;

A reflection plate disposed under the light guide plate;

A reflector guide disposed under the light guide plate to support the reflecting plate; And

And a housing reflector spaced in parallel with the reflector and disposed on an upper surface of the reflector guide.

A liquid crystal display device having a backlight assembly according to the present invention for achieving the above object,

A liquid crystal panel displaying an image;

An LED assembly emitting light toward the liquid crystal panel;

A light guide plate disposed adjacent to the LED assembly;

A guide panel surrounding the LED assembly and the light guide plate and supporting the liquid crystal panel;

A lower cover accommodating the LED assembly and the light guide plate;

A reflection plate disposed under the light guide plate;

A reflector guide disposed under the light guide plate to support the reflecting plate; And

And a housing reflector disposed on an upper surface of the reflector guide to correspond to the reflecting plate.

According to the backlight assembly and the liquid crystal display device having the same according to the present invention has the following effects.

According to the backlight assembly and the liquid crystal display device having the same according to the present invention, the light incidence region between the LED assembly and the light incidence surface of the light guide plate is perfect by the upper housing reflector disposed on the lower surface of the guide panel and the lower reflector attached to the reflector guide. The housing can be enabled to improve the efficiency of the backlight assembly.

In addition, according to the backlight assembly and the liquid crystal display device having the same according to the present invention, it is not a method of attaching a light shielding tape to an accurate position as in the conventional art, but a structure of inserting after attaching the housing reflector to the reflector guide after the reflector stacking. There is no fear of falling during the light guide plate stacking because the raised portion is eliminated, and the reflective light shielding printing process, which is a factor of lowering the yield and increasing the cost, can be omitted.

In addition, according to the backlight assembly and the liquid crystal display device having the same according to the present invention, a bright line generated in the light incident part due to the light leaking between the light guide plate and the reflector can be absorbed by the reflector guide of the present invention. As a result, defects such as bright lines and light leakage can be prevented.

Accordingly, according to the backlight assembly and the liquid crystal display device having the same, a liquid crystal display module (LCM) to which an edge type backlight is applied by absorbing light, which leaks between the light guide plate and the reflector, is applied to the reflector guide. In the process of developing narrow bezzel of products such as modules and TVs, defects such as bright lines and light leaks generated in the light incident part are eliminated.

1 is a cross-sectional view of a liquid crystal display having a backlight assembly according to the prior art.
FIG. 2 is a side cross-sectional view schematically illustrating a coupling state of a light guide plate and light absorbing members disposed in a liquid crystal display device having a backlight assembly of a liquid crystal display device according to the related art.
3 is an exploded perspective view of a liquid crystal display device having a backlight assembly according to the present invention.
4 is a combined view of a liquid crystal display device having a backlight assembly of the liquid crystal display device according to the present invention.
5 is a perspective view schematically illustrating a reflector guide to which a housing reflector is attached in a liquid crystal display device having a backlight assembly of a liquid crystal display device according to the present invention.
6 is a schematic perspective view illustrating a state in which a housing reflector and a reflecting plate are disposed on a reflector guide in a liquid crystal display including a backlight assembly of a liquid crystal display according to the present invention.

Hereinafter, a liquid crystal display having a backlight assembly of a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

3 is an exploded perspective view of a liquid crystal display device having a backlight assembly according to the present invention.

4 is a combined view of a liquid crystal display device having a backlight assembly of the liquid crystal display device according to the present invention.

As shown in FIGS. 3 and 4, the liquid crystal display device having the backlight assembly according to the present invention includes a liquid crystal panel 110 for displaying an image and a backlight assembly 120 for providing light to the liquid crystal panel 110. And, the top cover 140 is provided in a form surrounding the liquid crystal panel 110.

Here, the liquid crystal panel 110 includes a color filter array substrate 113, a TFT array substrate 111, and a liquid crystal layer (not shown) interposed therebetween. In addition, although not shown in the drawing, the liquid crystal panel 110 is attached to the front of the color filter array substrate 113 and the rear of the TFT array substrate 111 so that light passing through the liquid crystal panel 110 is cross-polarized. Upper polarizer (not shown) and lower polarizer (not shown).

In addition, although not shown in the drawings, the printed circuit board is connected to at least one edge of the liquid crystal panel 110 through a connecting member (not shown), such as a flexible circuit board or a tape carrier package (hereinafter, referred to as TCP). (Not shown) is connected to the side of the guide panel 130, or lower cover 170, the back of the guide panel 130 is properly folded in close contact.

The liquid crystal panel 110 is arranged in a matrix form of the liquid crystal cells forming a pixel unit, the liquid crystal cells to form an image by adjusting the light transmittance according to the image signal information transmitted from the driver driving circuit (not shown).

Although not shown in the figure, a plurality of gate lines and a plurality of data lines are formed in a matrix form in the TFT array substrate 111, and thin film transistors (TFTs) are formed at intersections of the gate lines and the data lines. Is formed. The signal voltage transmitted from the driver driving circuit (not shown) is applied between the pixel electrode and the common electrode (not shown) of the color filter array substrate 113 to be described later through the thin film transistor, and the liquid crystal between the pixel electrode and the common electrode is The light transmittance is determined according to the signal voltage.

Although not shown in the drawing, the color filter array substrate 113 includes a color filter and a common electrode which are formed by repeating red, green, and blue or cyan, magenta, and yellow colors with a black matrix. The common electrode is made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

In addition, one side of the liquid crystal panel 110 includes a driving driver (not shown) for driving unit pixels formed in the liquid crystal panel, and a flexible printed circuit board (FPCB) having one end connected to the liquid crystal panel. Not shown) is connected.

The backlight assembly 120 includes a lower cover 170, a plurality of LED assemblies 160 disposed at predetermined intervals on the side surface of the lower cover 170, and the lower cover 170. A reflector plate 125 applied or attached on an inner front surface, a light guide plate 123 disposed to form one surface with the LED assembly 160, and converting point light into surface light, and disposed on the light guide plate 123 to collect light. And optical sheets 121 to be diffused.

The backlight assembly 121 further includes a guide panel 130 accommodating the optical sheet 121, the light guide plate 123, and the reflecting plate 125 therein, and the guide panel 130 includes the guide panel 130. It is fastened with the lower cover 170.

The LED assembly 160 includes a plurality of LEDs 161, which emit red, green, blue, and white light as point light sources. It may be made of a combination of LEDs (161).

In addition, an LED substrate 163 having a conductive pattern is disposed on the rear surface of the LED 161 to supply a driving voltage to the LED 161.

The LED substrate 163 may be fixed by an adhesive pad (not shown) inside the lower cover 170. At this time, the adhesive pad (not shown) is one means for fixing the LED substrate 163 and the lower cover 170, although not shown in the figure, it may be changed to a screw (screw) or the like.

 The optical sheet 121 is for diffusing and condensing the light incident from the light guide plate 123. Although not shown in the drawing, the optical sheet 121 includes a diffusion sheet, a prism sheet, and a protective sheet. In some cases, it may be provided with two diffusion sheets and two prism sheets. At this time, the diffusion sheet 121 is composed of a base plate and a bead-shaped coating layer formed on the base plate.

The diffusion sheet (not shown) serves to diffuse the light from the LED assembly 160 to supply to the liquid crystal panel 110. The diffusion sheet (not shown) may be used by overlapping two or three.

In addition, the prism sheet (not shown) is formed in a triangular prism-like prism on the upper surface and the light diffused from the diffusion sheet (not shown) perpendicular to the plane of the upper liquid crystal panel 110 Condensing in the direction.

In addition, two prism sheets (not shown) are generally used, and the micro prisms formed on each prism sheet (not shown) form a predetermined angle.

Therefore, the light passing through the prism sheet (not shown) almost passes vertically to provide a uniform luminance distribution. The uppermost protective sheet (not shown) protects the prism sheet (not shown) that is vulnerable to scratches.

Meanwhile, the light guide plate 123 is disposed along the side of the LED 161 and is disposed on the rear surface of the liquid crystal panel 110 to guide light generated from the LED 161 to the rear surface of the liquid crystal panel 110. do. The light guide plate 123 may include a light incident surface (not shown) to which light emitted from the LED 161 is incident, a light exit surface (not shown) extending from the light incident surface (not shown) to face the liquid crystal panel 110. In addition, the light emitted from the LED 161 has a back pattern formed with a dot pattern (not shown) to be incident through the light incident surface (not shown) and proceed to the light exit surface (not shown).

Accordingly, the light guide plate 123 is a light emitting surface (not shown) by changing the light irradiated to the light incident surface (not shown) from the LED 161 disposed adjacent to the light incident surface (not shown) along one side thereof. It is uniformly delivered to the liquid crystal panel 110 through). As the material of the light guide plate 123, a high polymethymethacrylate (PMMA) having high strength does not easily deform or break and may have good transmittance.

The light guide plate 123 has an inclined portion (not shown) formed on an upper surface thereof in contact with the light incident surface 123a, and the entire upper surface except the inclined portion (not shown) is a light emitting surface (not shown) having a flat cross section. Consists of. On the other hand, the light guide plate 123 may be formed in a wedge shape that becomes thinner and thinner as it moves away from the light incident surface (not shown), or may be formed in a flat plate type. However, in the case of a liquid crystal display device applied to a small product such as a notebook PC or a mobile phone, a wedge-shaped light guide plate 123 may be applied. In general, the LED assembly 161 may be formed on a thick sidewall. It is provided.

The guide panel 130 is configured in the form of a square frame surrounding the side of the light guide plate 123, the edge portion of the liquid crystal panel 100 is supported on one side of the upper surface. In this case, the guide panel 130 is formed of a plastic material or a metal material such as PC material.

A horizontal extension portion (not shown) protrudes from the upper surface of the guide panel 130 to cover the upper surface of the light guide plate 123 that is in contact with the light incident surface (not shown). In this case, the liquid crystal panel 110 is disposed and supported on the horizontal extension part (not shown), and reflects light emitted upward from the LED 161 on the lower surface thereof and re-enters the light incident surface of the light guide plate 123. Although the upper housing reflector 129 of the white color system is attached to improve the light efficiency, the upper housing reflector 129 is not necessarily attached. In this case, the upper housing reflector 129 is formed on the lower surface of the guide panel 130 to be in contact with the light incident surface of the light guide plate 123.

In addition, the reflector plate 125 is provided below the light guide plate 123 and increases light efficiency by reflecting some light emitted to the lower part of the light guide plate 123 to the light exit surface (not shown) of the light guide plate 123. In addition, the reflection amount of the entire incident light is adjusted so that the entire emission surface has a uniform luminance distribution.

In addition, the lower cover 170 is configured in a rectangular box shape having an open top, and includes a light guide plate 123 and a reflecting plate 125 wrapped by the guide panel 130 in the lower cover 170. Components of the backlight assembly 120 are received.

The reflector guide 150 is disposed on an inner upper surface of the lower cover 170 in contact with an edge of a lower surface of the light guide plate 123. In this case, since the reflector guide 150 has a light absorbing function and a housing function at the same time, the efficiency of the backlight is improved and the bright line is removed. As the material of the reflector guide 150, a dark color material such as black color having a low reflectance is used.

5 is a perspective view schematically illustrating a reflector guide to which a housing reflector is attached in a liquid crystal display device having a backlight assembly of a liquid crystal display device according to the present invention.

6 is a schematic perspective view illustrating a state in which a housing reflector and a reflecting plate are disposed on a reflector guide in a liquid crystal display including a backlight assembly of a liquid crystal display according to the present invention.

5 and 6, the reflector guide 150 has a locking protrusion 151 protruding from the center of an upper surface thereof, and one side edge portion of the reflective plate 125 is disposed at one side of the locking protrusion 151.

In addition, a lower housing reflector 127 is attached to the other side of the locking protrusion 151 of the reflector guide 150. The lower housing reflector 127 is narrower and smaller in area than the reflector 125 even though the internal temperature of the device increases due to the continuous driving of the plurality of LEDs 161. It may be bonded to the upper surface of 150 or by using a separate fastening means. In this case, the lower housing reflector 127 may be expected to have a light blocking effect by dividing into two or more sections.

However, when the internal temperature of the device is increased due to the continuous driving of the plurality of LEDs 161, the reflector 125 is wide and large in area so that it can be increased by thermal expansion compared to the lower housing reflector 127. Because of this, the flow is freely arranged without being fixed to the reflector guide 150. At this time, even if the reflecting plate 125 is stretched by thermal expansion, it is caught by the locking protrusion 151 of the reflector guide 150 and no longer proceeds toward the LED assembly 160.

Therefore, the upper housing reflector 129 is formed on the lower surface of the guide panel 130 and is in contact with the light incident surface of the light guide plate 123, and corresponds to the housing reflector 127. Since the process of forming a light shielding tape in the surface end may be skipped, the cause of a yield fall and a cost increase can be eliminated.

In addition, since the lower housing reflector 127 is also attached to the reflector guide 150 on the upper surface of the lower cover 170 to absorb light leaking into the gap between the lower part of the light guide plate and the reflecting plate, the light The loss is reduced, improving the efficiency of the backlight. That is, since the housing is possible at the lower end of the LED assembly 160 by the reflector guide 150 regardless of environmental changes, light leaking into the gap between the lower part of the light guide plate and the reflecting plate is blocked.

The liquid crystal panel 110 and the backlight assembly 120 have a top cover 140 and a backlight assembly 120 covering the top edge of the liquid crystal panel 110 in a state where an edge thereof is surrounded by a guide panel 130 having a rectangular frame shape. The bottom cover 170 covering the rear surface is coupled to each other in front and rear to be integrated through the guide panel 130 to form a liquid crystal display device.

As described above, according to the backlight assembly and the liquid crystal display device having the same according to the present invention, a light incidence region between the LED assembly and the light incidence surface of the light guide plate is attached to the upper housing reflector and the reflector guide disposed on the upper surface of the guide panel. The lower reflector allows for a perfect housing, thereby improving the efficiency of the backlight assembly.

In addition, according to the backlight assembly and the liquid crystal display device having the same according to the present invention, it is not a method of attaching a light shielding tape to an accurate position as in the conventional art, but a structure of inserting after attaching the housing reflector to the reflector guide after the reflector stacking. There is no fear of falling during the light guide plate stacking because the raised portion is eliminated, and the reflective light shielding printing process, which is a factor of lowering the yield and increasing the cost, can be omitted.

In addition, according to the backlight assembly and the liquid crystal display device having the same according to the present invention, a bright line generated in the light incident part due to the light leaking between the light guide plate and the reflector can be absorbed by the reflector guide of the present invention. As a result, defects such as bright lines and light leakage can be prevented.

Accordingly, according to the backlight assembly and the liquid crystal display device having the same, a liquid crystal display module (LCM) to which an edge type backlight is applied by absorbing light, which leaks between the light guide plate and the reflector, is applied to the reflector guide. In the process of developing narrow bezzel of products such as modules and TVs, defects such as bright lines and light leaks generated in the light incident part are eliminated.

 Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that.

Therefore, since the embodiments described above are provided to completely inform the scope of the invention to those skilled in the art to which the present invention pertains, it should be understood that they are exemplary in all respects and not limited. The invention is only defined by the scope of the claims.

110: liquid crystal panel 111: TFT array substrate
113: color filter array substrate 120: backlight assembly 121: optical sheet 123: light guide plate
125: reflector 127: upper housing reflector
129: upper housing reflector 130: guide panel
140: top cover 150: reflector guide
151: engaging projection 160: LED assembly 161: LED 163: LED substrate 170: lower cover

Claims (10)

An LED assembly emitting light toward the liquid crystal panel;
A light guide plate disposed adjacent to the LED assembly;
A guide panel surrounding the LED assembly and the light guide plate;
A lower cover accommodating the LED assembly and the light guide plate;
A reflection plate disposed under the light guide plate;
A reflector guide disposed under the light guide plate to support the reflecting plate; And
And a housing reflector spaced in parallel with the reflector and disposed on an upper surface of the reflector guide. The backlight assembly of claim 1, wherein a locking protrusion is formed at a central portion of the reflector guide. The backlight assembly of claim 2, wherein the reflector and the housing reflector are disposed on both upper surfaces of the reflector guide based on the engaging projection of the reflector guide. The backlight assembly of claim 1, wherein the housing reflector is attached to an upper surface of the reflector guide, and the reflector is arranged to be movable in the reflector guide. The backlight assembly of claim 1, wherein the housing reflector is narrower in width than the reflector. A liquid crystal panel displaying an image;
An LED assembly emitting light toward the liquid crystal panel;
A light guide plate disposed adjacent to the LED assembly;
A guide panel surrounding the LED assembly and the light guide plate and supporting the liquid crystal panel;
A lower cover accommodating the LED assembly and the light guide plate;
A reflection plate disposed under the light guide plate;
A reflector guide disposed under the light guide plate to support the reflecting plate; And
And a housing reflector disposed on an upper surface of the reflector guide to correspond to the reflecting plate. 7. The liquid crystal display device according to claim 6, wherein a locking protrusion is formed at a central portion of the reflector guide. The liquid crystal display of claim 7, wherein the reflector and the housing reflector are disposed on upper surfaces of both sides of the reflector guide. 7. The liquid crystal display device according to claim 6, wherein the housing reflector is attached to an upper surface of the reflector guide, and the reflector is arranged to be movable in the reflector guide. The liquid crystal display of claim 6, wherein the housing reflector is narrower in width than the reflector.

KR1020110088686A 2011-09-01 2011-09-01 Backlight assembly and liquid crystal display device having the same KR20130025270A (en)

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Application Number Priority Date Filing Date Title
KR1020110088686A KR20130025270A (en) 2011-09-01 2011-09-01 Backlight assembly and liquid crystal display device having the same

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KR20130025270A true KR20130025270A (en) 2013-03-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160023986A (en) 2014-08-21 2016-03-04 희성전자 주식회사 Backlight Unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160023986A (en) 2014-08-21 2016-03-04 희성전자 주식회사 Backlight Unit

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