JP2007080800A - Light guide plate of backlight unit - Google Patents

Light guide plate of backlight unit Download PDF

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Publication number
JP2007080800A
JP2007080800A JP2005291426A JP2005291426A JP2007080800A JP 2007080800 A JP2007080800 A JP 2007080800A JP 2005291426 A JP2005291426 A JP 2005291426A JP 2005291426 A JP2005291426 A JP 2005291426A JP 2007080800 A JP2007080800 A JP 2007080800A
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guide plate
light guide
light
backlight unit
liquid crystal
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Japanese (ja)
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Un Chun Son
ウン チュン ソン
Ho Kim Te
ホ キム テ
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Taesan LCD Co Ltd
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Taesan LCD Co Ltd
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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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • 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
    • G02B6/003—Lens or lenticular 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • 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

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide plate of a backlight unit capable of improving brightness and uniformity of light by forming microstructures on upper and lower surfaces. <P>SOLUTION: The light guide plate of a backlight unit is mounted on a rear face of a liquid crystal display device and guides light incident from a light source toward the liquid crystal display device. The light guide plate is made of a plate-shaped translucent material, and includes: a lenticular section that is made up of a plurality of grooves provided in a lower surface of the light guide plate, causes a scattering of light incident from one side surface and allows the light to converge in a predetermined direction; and a condensing section that is made up of a plurality of solid projections formed to project on an upper surface of the light guide plate to have a shape of a polyhedral solid, and condenses light scattered by the lenticular section upward. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、液晶表示装置の導光板に関し、より詳しくは、液晶表示装置のバックライトユニットに含まれる導光板の上下部表面に構造物を形成することによって、プリズムシートを別途に取り付けることなく、光の明るさ及び均一度が向上できるバックライトユニットの導光板に関するものである。   The present invention relates to a light guide plate of a liquid crystal display device, more specifically, without forming a prism sheet separately by forming a structure on the upper and lower surfaces of the light guide plate included in the backlight unit of the liquid crystal display device, The present invention relates to a light guide plate of a backlight unit that can improve the brightness and uniformity of light.

液晶表示装置(ＬＣＤ)は、自ら発光し得ないという特性を持っているため、面光源の供給装置であるバックライトユニットが必要となる。バックライトユニットに用いられる導光板は、光源から放出される光が液晶表示装置に均一な輝度分布をもって均等に到達できるようにする機能を奏する。即ち、導光板は、側面、又は、背面の点光源又は線光源を面光源の形態に切り替える役割を果す部品である。   Since a liquid crystal display device (LCD) has a characteristic that it cannot emit light by itself, a backlight unit that is a surface light source supply device is required. The light guide plate used in the backlight unit has a function of allowing light emitted from the light source to reach the liquid crystal display device uniformly with a uniform luminance distribution. That is, the light guide plate is a component that plays a role of switching a point light source or a line light source on the side surface or the back surface to a surface light source form.

導光板はアクリル樹脂のような透明光学用樹脂により作製し、且つ、光の散乱及び反射のために表面に形成されている様々なパターンにより、導光板の内部へ入射された光線が外部に出射される。導光板表面のパターンは、光散乱インクを用いてスクリーン印刷法によりパターンを形成するといった方法で成されるが、最近は、金型にパターンを直接加工しかつ射出する方法により形成する場合もある。   The light guide plate is made of a transparent optical resin such as acrylic resin, and the light incident on the inside of the light guide plate is emitted to the outside by various patterns formed on the surface for light scattering and reflection. Is done. The pattern on the surface of the light guide plate is formed by a method of forming a pattern by a screen printing method using light scattering ink. Recently, the pattern may be formed by directly processing a pattern on a mold and injecting the pattern. .

図１は、従来技術の導光板が用いられた液晶表示装置のバックライトユニットの構成を示した概略図である。   FIG. 1 is a schematic diagram illustrating a configuration of a backlight unit of a liquid crystal display device using a conventional light guide plate.

従来技術による液晶表示装置のバックライトユニットは、光源２と、反射シート３、導光板９、拡散シート４、プリズムシート５ａ、５ｂ、保護シート６などを含んで成される。   A backlight unit of a conventional liquid crystal display device includes a light source 2, a reflection sheet 3, a light guide plate 9, a diffusion sheet 4, prism sheets 5a and 5b, a protective sheet 6, and the like.

光源２は、導光板９の側面に取り付けられ、且つ、光源２の後面には反射笠７が配設される。光源２の光は、導光板９の側面に直接入射されるか、又は、反射笠７により反射されかつ入射される。   The light source 2 is attached to the side surface of the light guide plate 9, and the reflective shade 7 is disposed on the rear surface of the light source 2. The light from the light source 2 is directly incident on the side surface of the light guide plate 9 or is reflected and incident by the reflecting shade 7.

導光板９の下部に形成されるパターン(図示せず)により散乱された光線は、一定した方向性を持たずに、様々な角度で乱れて反射され、導光板９の外部に出射される。したがって、パターン部位から散乱した光を面全体に均等に拡散させるための拡散シート４を導光板９上に装着しなければならず、様々な角度で分散されて出る光線を面に垂直な正面方向に集め、正面から視る際、面輝度を増加させるべくプリズムシート５ａ、５ｂを導光板９上に装着する。しかしながら、かかるシート等は、高価であるため、製造コストの上昇や製作工程の複雑化を齎す惧れがある。   Light rays scattered by a pattern (not shown) formed under the light guide plate 9 do not have a constant directionality, are disturbed and reflected at various angles, and are emitted to the outside of the light guide plate 9. Therefore, the diffusion sheet 4 for diffusing the light scattered from the pattern portion evenly over the entire surface must be mounted on the light guide plate 9, and the light beams dispersed and emitted at various angles are perpendicular to the surface. The prism sheets 5a and 5b are mounted on the light guide plate 9 in order to increase the surface brightness when viewed from the front. However, such a sheet or the like is expensive, and there is a concern that the manufacturing cost increases and the manufacturing process becomes complicated.

最近、導光板の上側面にプリズムシートを一体に形成することによって、必要なプリズムシート数を減らすことが試みられてはいるが、別途のプリズムシートを導光板上に取り付けなければならないといった構造的な制限が未だ存しているため、原価コストの上昇などの問題点がやはり残っていた。   Recently, an attempt has been made to reduce the number of prism sheets required by integrally forming a prism sheet on the upper surface of the light guide plate, but a separate prism sheet must be mounted on the light guide plate. However, there still remained problems such as an increase in cost costs because there were still restrictions.

本発明は、前記問題等に鑑みて成されたものであって、該目的は、上下表面に微細構造物を形成することから、別のプリズムシートを取り付けることなく光の明るさ及び均一度が向上できるバックライトユニットの導光板を提供することにある。   The present invention has been made in view of the above-mentioned problems, and the object is to form a fine structure on the upper and lower surfaces, so that the brightness and uniformity of light can be achieved without attaching another prism sheet. An object of the present invention is to provide a light guide plate of a backlight unit that can be improved.

本発明の他の目的は、光の拡散及び集光を行うために取り付けられたプリズムシート及び拡散シートに代わり得るような微細構造物が表面に形成されているバックライトユニットの導光板を提供することにある。   Another object of the present invention is to provide a light guide plate of a backlight unit having a prism sheet mounted for diffusing and condensing light, and a fine structure that can replace the diffusing sheet formed on the surface. There is.

前記目的を達成するために、本発明は、透光性材質からなり、下部面には構造物の一つとしてレンチキュラ部が備わり、且つ、上部面には他の構造物に当該する集光部が備わっているバックライトユニットの導光板を提供する。   In order to achieve the above object, the present invention is made of a translucent material, the lower surface is provided with a lenticular portion as one of the structures, and the upper surface has a light collecting portion corresponding to another structure. Provided is a light guide plate of a backlight unit equipped with.

液晶表示装置の後面に取り付けられ、光源から入射された光を液晶表示装置方向に導くバックライトユニットの導光板は、透光性材質の板材状からなり、導光板の下部面に備えられる複数の溝からなり、一側面から入射される光を散乱させ、所定方向に集めてくれるレンチキュラ部と、多面体の立体形状をなすべく導光板上部面に突き出されて形成される複数の立体突起部からなり、レンチキュラ部により散乱された光を上側方向に集める集光部と、を含む。   The light guide plate of the backlight unit, which is attached to the rear surface of the liquid crystal display device and guides the light incident from the light source in the direction of the liquid crystal display device, is made of a translucent material plate, and is provided with a plurality of light guide plates provided on the lower surface of the light guide plate. It consists of a groove, which scatters the light incident from one side and collects it in a predetermined direction, and a plurality of three-dimensional projections that are formed by protruding from the upper surface of the light guide plate to form a polyhedral three-dimensional shape And a light collecting part that collects light scattered by the lenticular part in an upward direction.

また、レンチキュラ部は、断面が半円状からなる複数の溝が、前記導光板の下部面に、光の入射される面に対して略平行な方向に長く設けられて成される。   The lenticular portion is formed by providing a plurality of grooves having a semicircular cross section in the lower surface of the light guide plate so as to extend in a direction substantially parallel to the light incident surface.

また、レンチキュラ部の表面には、光を散乱させるべく微細散乱溝が複数備えられている。   In addition, a plurality of fine scattering grooves are provided on the surface of the lenticular portion to scatter light.

また、立体突起部は、上側角が平坦に切り離された四角錐形状である。     Further, the three-dimensional protrusion has a quadrangular pyramid shape with the upper corner cut off flat.

さらに、導光板は、光が入射される方の断面が楔形状からなされる。   Further, the light guide plate has a wedge-shaped cross section on which light is incident.

好ましくは、液晶表示装置の後面に取り付けられ、光源から入射された光を液晶表示装置方向に導くバックライトユニットの導光板は、透光性材質の板材状からなり、導光板の下部面に、断面が半円状からなる複数の突起が、光の入射される面に対して略平行に長く延長形成され、一側面から入射される光を散乱させ、所定方向に集めるレンチキュラ部と、導光板の上部面に凹んで形成されかつ内壁面が深さ方向に傾斜をなす多角形の溝部からなり、レンチキュラ部により散乱された光を上側方向に集光する集光部と、を含んでなされる。   Preferably, the light guide plate of the backlight unit, which is attached to the rear surface of the liquid crystal display device and guides the light incident from the light source in the direction of the liquid crystal display device, is made of a translucent material plate, and on the lower surface of the light guide plate, A plurality of protrusions having a semicircular cross section are formed to extend substantially in parallel to the light incident surface, scatter the light incident from one side surface, and collect in a predetermined direction, and a light guide plate And a condensing part for condensing the light scattered by the lenticular part in the upper direction. .

さらに好ましくは、液晶表示装置の後面に取り付けられ、側面に位置する光源から入射された光を液晶表示装置方向に導くバックライトユニットの導光板は、透光性材質の板材状からなり、導光板下部面に、光の入射される面に対して略平行に長く延長される複数の溝、ないしは突起からなり、入射される光を散乱させ、所定方向に集めてくれるレンチキュラ部と、多面体の立体形状をなすように導光板上部面に突き出されて形成される複数の立体突起部からなり、レンチキュラ部により散乱された光を上側方向に集光する集光部と、を含む。   More preferably, the light guide plate of the backlight unit that is attached to the rear surface of the liquid crystal display device and guides the light incident from the light source located on the side surface in the direction of the liquid crystal display device is made of a translucent material plate, The lower surface is made up of a plurality of grooves or protrusions extending substantially parallel to the light incident surface, and scatters the incident light and collects it in a predetermined direction, and a polyhedral solid A light condensing unit that includes a plurality of three-dimensional projections that are formed by protruding from the upper surface of the light guide plate so as to form a shape, and condenses light scattered by the lenticular unit in an upward direction.

前述したように、本発明のバックライトユニットの導光板によれば、導光板の上下表面に備えられる構造物等により、別のプリズムシートを設けずとも、光の明るさや均一度が向上できる。   As described above, according to the light guide plate of the backlight unit of the present invention, the brightness and uniformity of light can be improved by providing structures and the like provided on the upper and lower surfaces of the light guide plate without providing another prism sheet.

また、本発明によるバックライトユニットの導光板に設けられるレンチキュラ部及び集光部のような微細構造物等が、従来技術により導光板に装着されていたプリズムシート、拡散シートに代えられることによって、製造工程の単純化を図ることができ、原価コストが低減するといった効果をも奏する。   In addition, the fine structure such as the lenticular part and the condensing part provided in the light guide plate of the backlight unit according to the present invention is replaced by the prism sheet and the diffusion sheet that are mounted on the light guide plate by the prior art, The manufacturing process can be simplified and the cost can be reduced.

以下、添付図面の好ましい実施例等を介して、本発明によるバックライトユニットの導光板の構成と作用とを詳しく説明する。   Hereinafter, the configuration and operation of the light guide plate of the backlight unit according to the present invention will be described in detail through preferred embodiments of the accompanying drawings.

図２は、本発明の第１実施例による導光板の側面図、図３は、本発明の第１実施例による導光板の斜視図、図４は、図２に示された導光板の底面から視た斜視図をそれぞれ示す。   2 is a side view of the light guide plate according to the first embodiment of the present invention, FIG. 3 is a perspective view of the light guide plate according to the first embodiment of the present invention, and FIG. 4 is a bottom view of the light guide plate shown in FIG. The perspective view seen from each is shown.

本発明の第１実施例によるバックライトユニットの導光板１０は、液晶表示装置の後面に装着され、光源より入射された光を液晶表示装置の方向に導く機能を奏する。   The light guide plate 10 of the backlight unit according to the first embodiment of the present invention is mounted on the rear surface of the liquid crystal display device, and has a function of guiding light incident from the light source toward the liquid crystal display device.

導光板１０は、アクリル樹脂のような透明光学用樹脂材の板材状から成される。図示されたように、導光板１０の側断面形状は、光源の入射方向に沿ってその肉厚が漸減する楔状からなることが好ましいが、肉厚が一定した平板状にも作製され得る。   The light guide plate 10 is made of a transparent optical resin material such as an acrylic resin. As shown in the drawing, the side cross-sectional shape of the light guide plate 10 is preferably a wedge shape whose thickness gradually decreases along the incident direction of the light source, but it can also be formed in a flat plate shape with a constant thickness.

導光板１０の上部面には、立体突起部１２ａによる集光部１２が備わり、且つ、下部面にはレンチキュラ部１１が備えられる。そこで、レンチキュラ部１１は、導光板１０の側面に位置する光源から入射する光を散乱させ、所定方向に集める機能を奏し、且つ、集光部１２は、レンチキュラ部１１により散乱された光を上側方向に集光する機能を果す。   On the upper surface of the light guide plate 10, a light condensing part 12 by a three-dimensional protrusion 12 a is provided, and on the lower surface, a lenticular part 11 is provided. Therefore, the lenticular unit 11 functions to scatter light incident from a light source located on the side surface of the light guide plate 10 and collect it in a predetermined direction, and the light collecting unit 12 It functions to condense in the direction.

前記レンチキュラ部１１は、導光板１０の下部面に形成される複数の溝１１ａからなされる。レンチキュラ部１１を成す溝１１ａは、該断面が半円状からなり、光の入射される面に対して略平行に長く形成されてなされる。また、レンチキュラ部１１は所定粗さを有するように加工され、且つ、該表面に光を散乱させるための微細散乱溝１３が複数備えられている。   The lenticular portion 11 is made up of a plurality of grooves 11 a formed on the lower surface of the light guide plate 10. The groove 11a forming the lenticular portion 11 has a semicircular cross section and is formed to be long and substantially parallel to the light incident surface. Further, the lenticular portion 11 is processed to have a predetermined roughness, and a plurality of fine scattering grooves 13 for scattering light are provided on the surface.

立体突起部１２ａは、上側角が平坦に切り離された四角錐状の立体的な形状であって、導光板１０の上部面から突き出されて成される。   The three-dimensional protrusion 12 a has a quadrangular pyramid three-dimensional shape with the upper corner cut off flatly, and is projected from the upper surface of the light guide plate 10.

次に、前述した構成からなる導光板１０を含むバックライトユニットの作動を説明する。   Next, the operation of the backlight unit including the light guide plate 10 having the above-described configuration will be described.

図５は、本発明の第１実施例による導光板を備えたバックライトユニットの解体状態を示したものである。以下では、導光板１０のそれぞれの面を説明するにおいて、光源２に接する側面部を入射面１４とし、上部面を出光面１５とし、さらに下部面を底面と称する。   FIG. 5 illustrates a disassembled state of the backlight unit including the light guide plate according to the first embodiment of the present invention. Hereinafter, in describing each surface of the light guide plate 10, the side surface in contact with the light source 2 is referred to as an incident surface 14, the upper surface is referred to as a light exit surface 15, and the lower surface is referred to as a bottom surface.

導光板１０の側面には、熱陰極蛍光ランプや冷陰極蛍光ランプのような光源２と反射笠７とが設けられ、光源２の光が直接、又は反射笠７により反射されて導光板１０側面の入射面１４へ入射される。導光板１０の下部面には反射シート３が設けられ、下側向きの光を上側の方に反射させる。   A light source 2 such as a hot cathode fluorescent lamp or a cold cathode fluorescent lamp and a reflective shade 7 are provided on the side surface of the light guide plate 10, and the light of the light source 2 is reflected directly or by the reflective shade 7 and is side face of the light guide plate 10. Is incident on the incident surface 14. A reflection sheet 3 is provided on the lower surface of the light guide plate 10 to reflect downward light toward the upper side.

導光板１０側面の入射面１４を介して入射された光は、導光板１０のレンチキュラ部１１により散乱が行われる。前述したように、レンチキュラ部１１の表面には微細散乱溝１３が備えられているため、光の散乱がより効率良く行われ得る。レンチキュラ部１１により散乱された光は、上側の出光面１５から一部が下側に再び反射され、且つ、一部は出光面１５を介して上側の液晶表示装置１９の方向に出射される。下側に反射された光は、出光面１５とレンチキュラ部１１との間で反射される過程が繰り返されて行われる。   Light incident through the incident surface 14 on the side surface of the light guide plate 10 is scattered by the lenticular portion 11 of the light guide plate 10. As described above, since the fine scattering grooves 13 are provided on the surface of the lenticular portion 11, light can be scattered more efficiently. A part of the light scattered by the lenticular unit 11 is reflected again downward from the upper light exit surface 15, and part of the light is emitted through the light exit surface 15 toward the upper liquid crystal display device 19. The light reflected downward is repeated by the process of reflection between the light exit surface 15 and the lenticular portion 11.

導光板１０の出光面１５へ出射される光は、立体突起部１２ａにより垂直方向に屈折されて集光する。即ち、従来では、導光板上側に拡散シートと、二つのプリズムシートとを交互に交差しかつ取り付けることによって、出光面に出射される光を拡散、集光させ得たが、本発明によれば、導光板１０上側の立体突起部１２ａが、前述した各種シートに代えて、同様な機能を果すことができる。   The light emitted to the light exit surface 15 of the light guide plate 10 is refracted and condensed in the vertical direction by the three-dimensional protrusion 12a. That is, conventionally, the light emitted from the light exit surface can be diffused and condensed by alternately crossing and mounting the diffusion sheet and the two prism sheets on the upper side of the light guide plate. The three-dimensional protrusion 12a on the upper side of the light guide plate 10 can perform the same function in place of the various sheets described above.

図６は、本発明の第２実施例による導光板の斜視図を示す。本発明の第２実施例による導光板の各構成要素は第１実施例と同様であるが、集光部２２をなす立体突起部２２ａの形状が相異して成される。第２実施例による導光板２０の上部面に形成の立体突起部２２ａは上側角が平坦に切り離された六角錐状からなされる。   FIG. 6 is a perspective view of a light guide plate according to a second embodiment of the present invention. The components of the light guide plate according to the second embodiment of the present invention are the same as those of the first embodiment, but the three-dimensional protrusions 22a forming the light condensing part 22 are different in shape. The three-dimensional protrusion 22a formed on the upper surface of the light guide plate 20 according to the second embodiment has a hexagonal pyramid shape with the upper corner cut off flat.

図７は、本発明の第３実施例による導光板の側面図を示す。本発明の第３実施例による導光板３０の下部面におけるレンチキュラ部３１は、断面が半円状からなる複数の突起３１ａが 、光の入射される面に対して略平行な方向に長く設けられて成される。また、レンチキュラ部３１は前述した第１実施例のような所定粗さを持つように加工され、光を散乱する複数の微細散乱溝(図示せず)が表面に形成される。   FIG. 7 shows a side view of a light guide plate according to a third embodiment of the present invention. In the lenticular portion 31 on the lower surface of the light guide plate 30 according to the third embodiment of the present invention, a plurality of protrusions 31a having a semicircular cross section are provided long in a direction substantially parallel to the light incident surface. It is done. The lenticular portion 31 is processed to have a predetermined roughness as in the first embodiment, and a plurality of fine scattering grooves (not shown) for scattering light are formed on the surface.

また、導光板３０の上部面には、レンチキュラ部３１により散乱される光を上側方向に集光する機能を奏する集光部３２が備えられている。集光部３２は、導光板３０の上部面に凹んで設けられ、且つ、内壁面３２ｂが深さ方向に傾斜をなす多角形の溝部３２ａからなることが好ましい。   The light guide plate 30 is provided with a light condensing part 32 that functions to condense light scattered by the lenticular part 31 upward. The light condensing part 32 is preferably formed of a polygonal groove part 32a that is recessed in the upper surface of the light guide plate 30 and whose inner wall surface 32b is inclined in the depth direction.

前述した第２実施例と第３実施例とによる導光板２０、３０を備える液晶表示装置のバックライトユニットの作動状態は、第１実施例に類似しているため、適宜説明を省略する。   Since the operation state of the backlight unit of the liquid crystal display device including the light guide plates 20 and 30 according to the second embodiment and the third embodiment is similar to that of the first embodiment, description thereof will be omitted as appropriate.

本発明は、特許請求の範囲で請求する請求の要旨から逸脱せずとも、当該技術分野において通常の知識を有する者により、様々に変形して実施することが可能となるため、本発明の技術保護範囲は前述した好ましい実施例に特に限定されるものではない。   The present invention can be variously modified and implemented by those having ordinary knowledge in the technical field without departing from the scope of the claims claimed in the claims. The protection range is not particularly limited to the preferred embodiments described above.

従来技術による導光板が用いられる液晶表示装置のバックライトユニットの構成を示す概略図。Schematic which shows the structure of the backlight unit of the liquid crystal display device with which the light-guide plate by a prior art is used. 本発明の第１実施例による導光板の側面図。The side view of the light-guide plate by 1st Example of this invention. 本発明の第１実施例による導光板の斜視図。1 is a perspective view of a light guide plate according to a first embodiment of the present invention. 図３に示された導光板の底面から視た斜視図。The perspective view seen from the bottom face of the light-guide plate shown by FIG. 本発明の第１実施例による導光板を備えたバックライトユニットの解体状態図。1 is a disassembled state diagram of a backlight unit including a light guide plate according to a first embodiment of the present invention. 本発明の第２実施例による導光板の斜視図。The perspective view of the light-guide plate by 2nd Example of this invention. 本発明の第３実施例による導光板の側面図。The side view of the light-guide plate by 3rd Example of this invention.

符号の説明Explanation of symbols

２ 光源
３ 反射シート
７ 反射笠
１１ａ 溝
１２ａ、２２ａ 立体突起部
１４ 入射面
１５ 出光面
１９ 液晶表示装置
３１ａ 突起
１３ 微細散乱溝
３２ａ 溝部
３２ｂ 内壁面
１１、３１ レンチキュラ部
１２、３２ 集光部
１０、２０、３０ 導光板 2 Light source 3 Reflective sheet 7 Reflective shade 11a Groove 12a, 22a Solid projection 14 Incident surface 15 Light exit surface 19 Liquid crystal display device 31a Protrusion 13 Fine scattering groove 32a Groove 32b Inner wall surface 11, 31 Lenticular part 12, 32 Condensing part 10, 20, 30 Light guide plate

Claims (7)

液晶表示装置の後面に装着され、光源から入射された光を前記液晶表示装置の方向に導くバックライトユニットの導光板において、
前記導光板は透光性材質の板材状からなり、
前記導光板下部面に備わる複数の溝からなり、一側面から入射される光を散乱させ、且つ、所定方向に集めてくれるレンチキュラ部及び、
多面体の立体形状をなすように前記導光上部面に突き出されて設けられる複数の突起部からなり、前記レンチキュラ部により散乱された光を上側方向に集光する集光部を含んでなされることを特徴とするバックライトユニットの導光板。 In the light guide plate of the backlight unit that is mounted on the rear surface of the liquid crystal display device and guides the light incident from the light source in the direction of the liquid crystal display device,
The light guide plate is made of a translucent material plate,
A plurality of grooves provided on the lower surface of the light guide plate, scatters light incident from one side surface, and collects in a predetermined direction, and
It is composed of a plurality of projecting portions protruding from the light guide upper surface so as to form a polyhedral solid shape, and includes a condensing portion that condenses light scattered by the lenticular portion in an upward direction. The light guide plate of the backlight unit characterized by this. 前記レンチキュラ部は、断面が半円状からなる複数の溝が、前記導光板の下部面に、光の入射される面に対して略平行な方向に長く形成されて成されることを特徴とする請求項１に記載のバックライトユニットの導光板。   The lenticular portion is formed by forming a plurality of grooves having a semicircular cross section in the lower surface of the light guide plate so as to extend in a direction substantially parallel to a light incident surface. The light guide plate of the backlight unit according to claim 1. 前記レンチキュラ部の表面には、光を散乱させるための複数の微細散乱溝が備えられていることを特徴とする請求項２に記載のバックライトユニットの導光板。   The light guide plate of the backlight unit according to claim 2, wherein a surface of the lenticular portion is provided with a plurality of fine scattering grooves for scattering light. 前記立体突起部は、上側角が平坦に切断された四角錐形状であることを特徴とする請求項２又は３に記載のバックライトユニットの導光板。   4. The light guide plate of a backlight unit according to claim 2, wherein the three-dimensional protrusion has a quadrangular pyramid shape with an upper corner cut flat. 5. 前記導光板は、光が入射される方向の断面が楔形状からなることを特徴とする請求項４に記載のバックライトユニットの導光板。   The light guide plate of the backlight unit according to claim 4, wherein the light guide plate has a wedge-shaped cross section in a light incident direction. 液晶表示装置の後面に取り付けられ、光源から入射された光を前記液晶表示装置方向に導くバックライトユニットの導光板において、
前記導光板は、透光性材質の板材状からなり、
前記導光板の下部面に、断面が半円状からなる複数の突起が、光の入射される面に対して略平行な方向に長く形成され、一側面から入射される光を散乱させ、所定方向に集めてくれるレンチキュラ部及び、
前記導光板の上部面に凹んで形成され、且つ、内壁面が深さ方向に傾斜をなす多角形の溝部からなされ、前記レンチキュラ部により散乱された光を上側方向に集光する集光部を含んでなされることを特徴とするバックライトユニットの導光板。 In the light guide plate of the backlight unit that is attached to the rear surface of the liquid crystal display device and guides the light incident from the light source in the direction of the liquid crystal display device,
The light guide plate is made of a translucent plate material,
A plurality of protrusions having a semicircular cross section are formed on the lower surface of the light guide plate so as to extend in a direction substantially parallel to the light incident surface, and scatter light incident from one side surface. Lenticular part that collects in the direction, and
A condensing part that is formed in a concave shape on the upper surface of the light guide plate and that has an inner wall surface formed of a polygonal groove portion that is inclined in the depth direction, and that condenses light scattered by the lenticular portion in an upward direction. A light guide plate for a backlight unit, comprising: 液晶表示装置の後面に取り付けられ、光源から入射された光を前記液晶表示装置方向に導くバックライトユニットの導光板において、
前記導光板は透光性材質の板材状からなり、
前記導光板の下部面に、光の入射される面に対して略平行な方向に長く延長される複数の溝、ないしは突起からなり、且つ、入射される光を散乱させ、所定方向に集めてくれるレンチキュラ部及び、
多面体の立体形状をなすように前記導光板の上部面に突き出されて成される複数の立体突起部からなり、前記レンチキュラ部により散乱された光を上側方向に集光する集光部を含んでなされることを特徴とするバックライトユニットの導光板。 In the light guide plate of the backlight unit that is attached to the rear surface of the liquid crystal display device and guides the light incident from the light source in the direction of the liquid crystal display device,
The light guide plate is made of a translucent material plate,
The lower surface of the light guide plate includes a plurality of grooves or protrusions extending in a direction substantially parallel to the light incident surface, and scatters incident light and collects it in a predetermined direction. Lenticular part and
It comprises a plurality of three-dimensional projections protruding from the upper surface of the light guide plate so as to form a polyhedral three-dimensional shape, and includes a condensing part that condenses light scattered by the lenticular part in the upward direction. A light guide plate of a backlight unit, wherein the light guide plate is made.
JP2005291426A 2005-09-12 2005-10-04 Light guide plate of backlight unit Pending JP2007080800A (en)

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KR101872348B1 (en) 2011-06-22 2018-06-29 삼성디스플레이 주식회사 Light guide plate for backlight unit and manufacturing method thereof
KR101891167B1 (en) * 2011-08-11 2018-08-23 엘지디스플레이 주식회사 Liquid crystal display device
TWI457621B (en) * 2012-02-07 2014-10-21 Chi Lin Optoelectronics Co Ltd Display device, backlight module, silk screen, light guide plate and method for making a light guide plate
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