JP2004014527A - Surface light source device - Google Patents

Surface light source device Download PDF

Info

Publication number
JP2004014527A
JP2004014527A JP2003316107A JP2003316107A JP2004014527A JP 2004014527 A JP2004014527 A JP 2004014527A JP 2003316107 A JP2003316107 A JP 2003316107A JP 2003316107 A JP2003316107 A JP 2003316107A JP 2004014527 A JP2004014527 A JP 2004014527A
Authority
JP
Japan
Prior art keywords
light
guide plate
light guide
light source
source device
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2003316107A
Other languages
Japanese (ja)
Inventor
Masayuki Shinohara
篠原　正幸
Shigeru Aoyama
青山　茂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omron Corp
Original Assignee
Omron Corp
Omron Tateisi Electronics Co
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 Omron Corp, Omron Tateisi Electronics Co filed Critical Omron Corp
Priority to JP2003316107A priority Critical patent/JP2004014527A/en
Publication of JP2004014527A publication Critical patent/JP2004014527A/en
Priority to CNA2004100564797A priority patent/CN1595251A/en
Priority to KR1020040070263A priority patent/KR20050025905A/en
Priority to TW093126942A priority patent/TW200515019A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • G02F1/133504—Diffusing, scattering, diffracting 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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Liquid Crystal (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface light source device equalized in luminance distribution, and improved in luminance. <P>SOLUTION: This surface light source device comprises a point light source-like light emission part 26 emitting light, and a light guide plate 22 for shutting up the light introduced from a light incident surface and taking out the light to the outside from a light emission surface 23. The lower face of the light guide plate 22 is formed with a diffusion pattern, and the light guide plate 22 is formed with a conical vacant space 27 in front of the light emission part 26. By making the light emitted from the light emission part 26 reflect on an interface of the vacant space 27, the light is advanced to a corner part of the light guide plate 22. <P>COPYRIGHT: (C)2004,JPO

Description

　本発明は面光源装置に関する。具体的にいうと、本発明は液晶表示装置や照明装置などに用いられる面光源装置に関する。 The present invention relates to a surface light source device. Specifically, the present invention relates to a surface light source device used for a liquid crystal display device, a lighting device, and the like.

　（第１の従来例）
　従来例の面光源装置１を図１の分解斜視図及び図２の断面図により示す。面光源装置１は、光を閉じ込めるための導光板２と発光部３と反射板４とから構成されている。導光板２はポリカーボネイト樹脂やメタクリル樹脂等の透明で屈折率の大きな樹脂により成形されており、導光板２の下面には凹凸加工や拡散反射インクのドット印刷等によって拡散パターン５が形成されている。発光部３は、回路基板６上に複数の発光ダイオード（ＬＥＤ）等のいわゆる点光源７を実装したものであって、導光板２の側面（光入射面８）に対向している。反射板４は、反射率の高い例えば白色樹脂シートによって形成されており、両面テープ９によって両側部を導光板２の下面に貼り付けられている。 (First conventional example)
A conventional surface light source device 1 is shown in an exploded perspective view of FIG. 1 and a sectional view of FIG. The surface light source device 1 includes a light guide plate 2 for confining light, a light emitting unit 3 and a reflection plate 4. The light guide plate 2 is formed of a transparent resin having a large refractive index such as a polycarbonate resin or a methacrylic resin, and a diffusion pattern 5 is formed on the lower surface of the light guide plate 2 by uneven processing, dot printing of a diffuse reflection ink, or the like. . The light-emitting unit 3 is configured by mounting a so-called point light source 7 such as a plurality of light-emitting diodes (LEDs) on a circuit board 6, and faces the side surface (light incident surface 8) of the light guide plate 2. The reflection plate 4 is formed of, for example, a white resin sheet having a high reflectance, and has both sides adhered to the lower surface of the light guide plate 2 by a double-sided tape 9.

　また、面光源装置１において導光板２の光出射面１０の４方周縁を除いた矩形領域が、液晶等の照明に実際に使用される有効領域である。 {Circle around (4)} In the surface light source device 1, a rectangular area excluding the four-sided periphery of the light exit surface 10 of the light guide plate 2 is an effective area actually used for illumination of liquid crystal or the like.

　しかして、図２に示すように、発光部３から出射されて光入射面８から導光板２の内部に導かれた光ｆは、導光板２内部で全反射することによって導光板２内部に閉じ込められる。導光板２内部の光ｆは拡散パターン５に入射すると拡散反射され、光出射面１０へ向けて全反射の臨界角よりも小さな角度で反射された光ｆが光出射面１０から外部へ取り出される。また、導光板２下面の拡散パターン５の存在しない箇所を透過した光ｆは、反射板４によって反射されて再び導光板２内部へ戻るので、導光板２下面からの光量損失が防止される。 Thus, as shown in FIG. 2, the light f emitted from the light emitting unit 3 and guided from the light incident surface 8 to the inside of the light guide plate 2 is totally reflected inside the light guide plate 2 to enter the light guide plate 2. You are trapped. The light f inside the light guide plate 2 is diffusely reflected when entering the diffusion pattern 5, and the light f reflected at an angle smaller than the critical angle of the total reflection toward the light emission surface 10 is extracted from the light emission surface 10 to the outside. . Further, the light f transmitted through the portion of the lower surface of the light guide plate 2 where the diffusion pattern 5 does not exist is reflected by the reflector 4 and returns to the inside of the light guide plate 2 again, so that the light amount loss from the lower surface of the light guide plate 2 is prevented.

　点光源を用いた上記のような面光源装置１は、低消費電力化のため、点光源７で疑似的に線状光源化を図ったものであった。すなわち、点光源７を一列に配列することによって冷陰極線管のような線状光源を模したものである。従って、より低消費電力化を図るためには、点光源７の数を減らして、好ましくは１つの点光源７により高輝度で輝度ばらつきの少ない面光源装置１を得ることが望まれる。 面 In the surface light source device 1 using a point light source as described above, the point light source 7 is simulated to be a linear light source in order to reduce power consumption. That is, a linear light source such as a cold cathode ray tube is imitated by arranging the point light sources 7 in a line. Therefore, in order to achieve lower power consumption, it is desired to reduce the number of the point light sources 7, and preferably obtain the surface light source device 1 having high luminance and less luminance variation by one point light source 7.

　しかしながら、１つの点光源７で面光源装置１を光らせようとすると、図３に示すように、点光源７からの光ｆが導光板２の光入射面８で全反射するため、導光板２との結合効率が悪く、面光源装置１の輝度が低かった。さらに、導光板２の隅部分１１（図３で斜線を施した領域）が有効領域Ｒの隅部にまでわたって暗くなり、面光源装置１に大きな輝度ばらつきが発生していた。 However, when trying to illuminate the surface light source device 1 with one point light source 7, the light f from the point light source 7 is totally reflected by the light incident surface 8 of the light guide plate 2 as shown in FIG. And the brightness of the surface light source device 1 was low. Further, the corner portion 11 (the shaded region in FIG. 3) of the light guide plate 2 is darkened over the corner portion of the effective region R, and a large luminance variation occurs in the surface light source device 1.

　なお、面光源装置の従来例としては、下記特許文献１、特許文献２が知られている。
特開平０６−５１１３０号 特開昭６１−２４０５０６号 In addition, as a conventional example of a surface light source device, the following Patent Documents 1 and 2 are known.
JP-A-06-51130 JP-A-61-240506

　本発明は上記のような従来例の問題点に鑑みてなされたものであり、その目的とするところは、面光源装置の輝度分布を均一化し、また輝度を向上させることにある。 The present invention has been made in view of the above-described problems of the conventional example, and has as its object to make the luminance distribution of the surface light source device uniform and improve the luminance.

　本発明にかかる面光源装置は、光入射面より導入された光を閉じ込めて光出射面から外部へ取り出すための導光板と、導光板の光入射面側に配置された、導光板の幅と比較して小さな光源とを備え、光源から出射された光を光入射面から導光板内部に導いて導光板内部に閉じ込め、導光板の光出射面から外部へ取り出す面光源装置において、前記光源の前方において、導光板内を伝搬する光を拡散させて広げるための空所を導光板に形成したことを特徴としている。 The surface light source device according to the present invention is a light guide plate for confining light introduced from the light incident surface and extracting the light from the light exit surface to the outside, and disposed on the light incident surface side of the light guide plate, the width of the light guide plate. A light source that is smaller than the light source, guides light emitted from the light source from the light incident surface to the inside of the light guide plate, confine the light guide plate inside, and takes out the light from the light exit surface of the light guide plate to the outside; The light guide plate is characterized in that a space for diffusing and expanding the light propagating in the light guide plate is formed in the front of the light guide plate.

　本発明にかかる別な面光源装置は、光入射面より導入された光を閉じ込めて光出射面から外部へ取り出すための導光板と、導光板の光入射面側に配置された、導光板の幅と比較して小さな光源とを備え、光源から出射された光を光入射面から導光板内部に導いて導光板内部に閉じ込め、導光板の光出射面から外部へ取り出す面光源装置において、前記光源の前方において、導光板内を伝搬する光を導光板の有効領域の隅部へ向けて反射させるための空所を導光板に形成したことを特徴としている。 Another surface light source device according to the present invention is a light guide plate for confining light introduced from the light incident surface and extracting the light from the light exit surface to the outside, and a light guide plate disposed on the light incident surface side of the light guide plate. A light source having a smaller width than the light source, the light emitted from the light source is guided from the light incident surface into the light guide plate and confined inside the light guide plate, and the surface light source device is extracted from the light exit surface of the light guide plate to the outside, A cavity is formed in the light guide plate in front of the light source to reflect light propagating in the light guide plate toward the corner of the effective area of the light guide plate.

　本発明の面光源装置における前記空所は、導光板を表裏に貫通していてもよく、あるいは、空所の一端が導光板の表裏のうち一方で開口し、空所の他端が導光板の表裏のうち他方と近接していてもよい。また、導光板の空所は、断面が三角形と成っていてもよい。 In the surface light source device of the present invention, the space may penetrate the light guide plate from the front to the back, or one end of the space is opened on one of the front and back of the light guide plate, and the other end of the space is the light guide plate. May be close to the other of the front and back. Further, the space of the light guide plate may have a triangular cross section.

　本発明にかかる面光源装置にあっては、光源の前方に空所を形成しているから、光源から空所に向けて出射された光が、導光板と空所の境界面で全反射したり屈折したりすることにより、導光板内部で拡散され、導光板の全体に広がる。特に、導光板と空所との境界面で光が後方へ全反射されるので、導光板の隅部分にも光が到達し、導光板の隅部分が暗くなるのが防止される。従って、導光板の幅に比較して小さな光源を用いる場合にも、面光源装置の輝度分布を均一化することができる。 In the surface light source device according to the present invention, since the cavity is formed in front of the light source, light emitted from the light source toward the cavity is totally reflected at the boundary surface between the light guide plate and the cavity. Due to the refraction or refraction, the light is diffused inside the light guide plate and spreads over the entire light guide plate. In particular, since the light is totally reflected rearward at the boundary surface between the light guide plate and the empty space, the light reaches the corners of the light guide plate and the corners of the light guide plate are prevented from being darkened. Therefore, even when a light source smaller than the width of the light guide plate is used, the luminance distribution of the surface light source device can be made uniform.

　本発明にかかる別な面光源装置にあっては、光源の前方に空所を形成しているから、光源から空所に向けて出射された光が、導光板と空所の境界面で後方へ全反射されるので、導光板の隅部分に光が到達し、導光板の隅部分が暗くなるのが防止される。 In another surface light source device according to the present invention, since the cavity is formed in front of the light source, light emitted from the light source toward the cavity is rearward at the boundary surface between the light guide plate and the cavity. Since the light is totally reflected, the light reaches the corners of the light guide plate and the corners of the light guide plate are prevented from being darkened.

　空所の形状は、特に限定されるものではないが、例えば、空所を導光板を貫通していない構成とすれば、空所からの導光板の厚み方向への光の漏れが低減し、輝度分布の均一性が低下しない。また、断面三角形状の空所を設ければ、その三角形の形状を変化させることにより空所で反射された光の方向を制御することができ、面光源装置の輝度分布の均一性がより向上するといった優れた効果がある。 The shape of the void is not particularly limited, but, for example, if the void does not penetrate the light guide plate, light leakage from the void in the thickness direction of the light guide plate is reduced, The uniformity of the luminance distribution does not decrease. In addition, if a void having a triangular cross section is provided, the direction of light reflected by the void can be controlled by changing the shape of the triangle, and the uniformity of the luminance distribution of the surface light source device is further improved. There is an excellent effect of doing.

　なお、この発明の以上説明した構成要素は、可能な限り任意に組み合わせることができる。 The components of the present invention described above can be combined as arbitrarily as possible.

　以下、本発明の実施例を図面に従って詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

　図４は本発明の実施例１による面光源装置２１を示す斜視図、図５はその一部破断した縦断面図である。この面光源装置２１にあっては、屈折率の大きな透明樹脂材料によって形成されている導光板２２の上面が光出射面２３となっており、下面には凹凸加工や拡散反射インクのドット印刷等によって拡散パターン（図示せず）が形成されている。この導光板２２の下面には、表面反射率の高い材料、例えば硬質もしくは比較的軟質の白色プラスチックシートによって形成された反射板２４が設けられている。また、光出射面２３の中央の矩形領域が有効領域Ｒとなっている。この有効領域Ｒは例えば液晶表示装置の面光源装置（バックライト）として用いられる場合でいえば、液晶表示パネルの画素が形成されている領域と対向している領域である。さらに、導光板２２の光入射面２５の中央に対向する位置には、発光部２６（点光源）が配置されており、発光部２６の前方において、導光板２２には、先端が細くなった略円錐形状ないし砲弾型の空所２７が形成されており、空所２７の上端は導光板２２の上面（光出射面２３）の近傍に達している。 FIG. 4 is a perspective view showing the surface light source device 21 according to the first embodiment of the present invention, and FIG. In this surface light source device 21, an upper surface of a light guide plate 22 formed of a transparent resin material having a large refractive index serves as a light emitting surface 23, and a lower surface thereof has an uneven surface, a dot printing of diffuse reflection ink, or the like. Thereby, a diffusion pattern (not shown) is formed. On the lower surface of the light guide plate 22, there is provided a reflection plate 24 formed of a material having a high surface reflectance, for example, a hard or relatively soft white plastic sheet. The central rectangular area of the light emitting surface 23 is an effective area R. The effective region R is, for example, a region facing a region where pixels of a liquid crystal display panel are formed, when used as a surface light source device (backlight) of a liquid crystal display device. Further, a light emitting unit 26 (point light source) is disposed at a position facing the center of the light incident surface 25 of the light guide plate 22, and the front end of the light guide plate 22 is thinner in front of the light emitting unit 26. A substantially conical or shell-shaped space 27 is formed, and the upper end of the space 27 reaches near the upper surface (light emitting surface 23) of the light guide plate 22.

　発光部２６は、導光板２２の幅に比べて小さな光源であって、図５に示すように、白色樹脂等の表面反射率の高い材質からなる外装部材２８によって点光源状の発光素子２９を包んだものである。発光素子２９においては、一方のリード端子３０の先端にＬＥＤ等の微小発光素子チップ３１をダイボンドし、発光素子チップ３１と他方のリード端子の先端とをボンディングワイヤで結線した後、発光素子チップ３１及び一方のリード端子３０及び他方のリード端子を透明封止樹脂３２中にモールドして形成されている。この結果、発光素子２９は光出射側の一面（前面）だけが外装部材２８から露出している。なお、発光素子２９としては、豆電球等を用いても差し支えない。 The light emitting section 26 is a light source that is smaller than the width of the light guide plate 22, and as shown in FIG. 5, a light source element 29 having a point light source shape is formed by an exterior member 28 made of a material having a high surface reflectance such as white resin. Wrapped. In the light emitting element 29, a micro light emitting element chip 31 such as an LED is die-bonded to the end of one lead terminal 30, and the light emitting element chip 31 is connected to the end of the other lead terminal with a bonding wire. And one lead terminal 30 and the other lead terminal are molded in a transparent sealing resin 32. As a result, only one surface (front surface) of the light emitting element 29 is exposed from the exterior member 28 on the light emission side. Note that a miniature bulb or the like may be used as the light emitting element 29.

　しかして、発光素子チップ３１から前面以外の方向、例えば背面方向へ出射された光は、透明封止樹脂３２中を通って透明封止樹脂３２と外装部材２８との境界面に達し、この境界面で反射される。このようにして外装部材２８との境界面で１回又は複数回反射した光は、発光素子２９の前面から前方に向けて出射され、光入射面２５から導光板２２の内部へ導入される。このように、発光部２６によって発光素子２９からの光を前面に集めて出射させることができるので、発光素子２９と導光板２２との光結合効率を高め、面光源装置２１の輝度を向上させることができる。 Thus, the light emitted from the light emitting element chip 31 in a direction other than the front surface, for example, in the rear direction, passes through the transparent sealing resin 32 and reaches the boundary surface between the transparent sealing resin 32 and the exterior member 28. Reflected by the surface. The light reflected once or a plurality of times at the boundary surface with the exterior member 28 is emitted forward from the front surface of the light emitting element 29 and introduced into the light guide plate 22 from the light incident surface 25. As described above, since the light from the light emitting element 29 can be collected and emitted to the front by the light emitting unit 26, the light coupling efficiency between the light emitting element 29 and the light guide plate 22 is increased, and the luminance of the surface light source device 21 is improved. be able to.

　さらに、導光板２２に導入された光のうち、発光部２６から空所２７に向けて出射された光は、図６に示すように、発光部２６の前方に形成された略円錐状の空所２７の境界面によって、様々な方向に全反射したり屈折したりすることにより、導光板２２内部で拡散され、導光板２２の全体に広がる。特に、導光板２２と空所２７との境界面で光が後方へ全反射されるので、有効領域Ｒの隅部Ｑにも光が到達し、隅部Ｑが暗くなるのが防止される。従って、導光板２２の幅に比較して小さな発光部２６（点光源）を用いる場合にも、面光源装置２１の輝度分布を均一化することができる。 Further, of the light introduced into the light guide plate 22, the light emitted from the light emitting unit 26 toward the space 27 is a substantially conical empty space formed in front of the light emitting unit 26 as shown in FIG. The light is totally reflected or refracted in various directions by the boundary surface of the place 27, so that the light is diffused inside the light guide plate 22 and spreads over the entire light guide plate 22. In particular, since the light is totally reflected rearward at the boundary surface between the light guide plate 22 and the space 27, the light reaches the corner Q of the effective area R and the corner Q is prevented from being darkened. Therefore, even when a light emitting portion 26 (point light source) smaller than the width of the light guide plate 22 is used, the luminance distribution of the surface light source device 21 can be made uniform.

　図７は本発明の実施例２による面光源装置４１を示す斜視図、図８はその一部破断した縦断面図である。この面光源装置４１にあっては、空所４２は、導光板２２を貫通する円柱形とされている。本実施例及び以下の実施例で示すように、空所４２の形状は特に限定されるものではなく、形状によって輝度分布に与える影響が異なっている。 FIG. 7 is a perspective view showing a surface light source device 41 according to Embodiment 2 of the present invention, and FIG. 8 is a longitudinal sectional view with a part thereof cut away. In the surface light source device 41, the space 42 has a cylindrical shape penetrating the light guide plate 22. As shown in the present embodiment and the following embodiments, the shape of the void 42 is not particularly limited, and the influence on the luminance distribution differs depending on the shape.

　発光部２６から出射された光は、図８に示すように、実施例１と同様にして、効率良く導光板２２に結合し、空所４２に達した光は導光板２２のほぼ面方向に反射されて導光板２２全体に拡散される。この際、導光板２２と空所４２との境界面で光が後方へ全反射されるので、有効領域Ｒの隅部Ｑにも光が到達し、隅部Ｑが暗くなるのを防止することができる。 As shown in FIG. 8, the light emitted from the light emitting unit 26 is efficiently coupled to the light guide plate 22 in the same manner as in the first embodiment, and the light reaching the space 42 is substantially in the plane direction of the light guide plate 22. The light is reflected and diffused throughout the light guide plate 22. At this time, since the light is totally reflected rearward at the boundary surface between the light guide plate 22 and the space 42, it is possible to prevent the light from reaching the corner Q of the effective region R and darkening the corner Q. Can be.

　図９は本発明の実施例３による面光源装置４３を示す斜視図、図１０は同上の一部破断した縦断面図である。この面光源装置４３にあっては、空所４４は、導光板２２を貫通していない、すなわち、実施例２において、光出射面２３に達しない円柱とされている。このように、空所４４が光出射面２３に達していない構成とすれば、空所４４からの導光板２２の厚み方向への光ｆの漏れ（図１０において破線で示す）が低減し、輝度分布の均一性の低下を防止することができる。 FIG. 9 is a perspective view showing a surface light source device 43 according to Embodiment 3 of the present invention, and FIG. 10 is a longitudinal sectional view of the same, partially broken away. In the surface light source device 43, the space 44 does not penetrate the light guide plate 22, that is, is a column that does not reach the light exit surface 23 in the second embodiment. As described above, if the space 44 does not reach the light emitting surface 23, leakage of light f (shown by a broken line in FIG. 10) from the space 44 in the thickness direction of the light guide plate 22 is reduced. It is possible to prevent a decrease in the uniformity of the luminance distribution.

　発光部２６から出射された光は、図１０に示すように、実施例１と同様にして、効率良く導光板２２に結合し、空所４４に達した光は導光板２２全体に拡散される。この際、空所４４の上面が導光板２２の光出射面２３から露出していないので、実施例２に比べ、空所４４からの導光板２２の厚み方向への光ｆの漏れが低減する。 As shown in FIG. 10, the light emitted from the light emitting unit 26 is efficiently coupled to the light guide plate 22 in the same manner as in the first embodiment, and the light reaching the space 44 is diffused throughout the light guide plate 22. . At this time, since the upper surface of the cavity 44 is not exposed from the light exit surface 23 of the light guide plate 22, leakage of the light f from the cavity 44 in the thickness direction of the light guide plate 22 is reduced as compared with the second embodiment. .

　図１１は本発明の実施例４による面光源装置４５を示す平面図、図１２はその一部破断した縦断面図である。この面光源装置４５にあっては、実施例１〜３において、空所４６を、断面三角形としている。そして、断面三角形状の空所４６の頂点を発光部２６に向け、三角形の底辺を発光部２６と頂点との結線に直交させるように配置すれば、発光部２６からの光が効率よく有効領域Ｒの光源側左右両隅部Ｑに集まり、面光源装置４５の輝度分布の均一性がより向上するといった優れた効果がある。 FIG. 11 is a plan view showing a surface light source device 45 according to Embodiment 4 of the present invention, and FIG. 12 is a longitudinal sectional view with a part thereof cut away. In this surface light source device 45, the cavities 46 are triangular in cross section in Examples 1 to 3. If the apex of the void 46 having a triangular cross section is directed toward the light emitting part 26 and the base of the triangle is arranged so as to be orthogonal to the connection between the light emitting part 26 and the apex, the light from the light emitting part 26 can be efficiently used in the effective area. There is an excellent effect that the light is gathered at the right and left corners Q on the light source side of R and the uniformity of the luminance distribution of the surface light source device 45 is further improved.

　（照明装置）
　図１３は本発明にかかる面光源装置を利用した照明装置５１を示す斜視図である。この照明装置５１においては、光量を大きくして輝度を高くするため、４つの発光部５２を用いている。この照明装置５１は室内照明用や自動車のテールランプなどに用いられるものである。なお、実施例１と同様の部材には同符号を付してある。 (Lighting device)
FIG. 13 is a perspective view showing a lighting device 51 using the surface light source device according to the present invention. In this lighting device 51, four light emitting units 52 are used in order to increase the amount of light and increase the luminance. The lighting device 51 is used for indoor lighting, a tail lamp of an automobile, and the like. The same members as those in the first embodiment are denoted by the same reference numerals.

　（液晶表示装置）
　図１４は本発明にかかる面光源装置を用いた液晶表示装置６１を示す分解斜視図である。この面光源装置６０にあっては、導光板２２に赤（Ｒ）６２ａ、緑（Ｇ）６２ｂ、青（Ｂ）６２ｃの３色の発光素子を備えた発光部６２が装着されている。面光源装置６０の光出射面２３には、拡散シート６３が対向配置され、その上面に液晶表示パネル６４が対向配置されている。液晶表示パネル６４は、透明電極やＴＦＴ、カラーフィルタ、ブラックマトリクス等を形成された２枚の液晶基板（ガラス基板、フィルム基板）６５、６６間に液晶材料を封止し、液晶基板６５、６６の両外面に偏光板６７を配置したものである。 (Liquid crystal display)
FIG. 14 is an exploded perspective view showing a liquid crystal display device 61 using the surface light source device according to the present invention. In the surface light source device 60, a light emitting unit 62 having three color light emitting elements of red (R) 62 a, green (G) 62 b, and blue (B) 62 c is mounted on the light guide plate 22. The light emitting surface 23 of the surface light source device 60 is provided with a diffusion sheet 63 opposed thereto, and a liquid crystal display panel 64 is provided on the upper surface thereof. The liquid crystal display panel 64 seals a liquid crystal material between two liquid crystal substrates (glass substrate, film substrate) 65 and 66 on which a transparent electrode, a TFT, a color filter, a black matrix and the like are formed. The polarizing plate 67 is arranged on both outer surfaces of the above.

　このような液晶表示装置６１によれば、表示面の輝度分布を均一にすることができ、液晶表示装置６１の高品質化を図ることができる。 According to such a liquid crystal display device 61, the luminance distribution on the display surface can be made uniform, and the quality of the liquid crystal display device 61 can be improved.

　（液晶表示装置を備えた電子手帳等）
　本発明にかかる液晶表示装置は、携帯電話や弱電力無線機のような無線情報伝達装置、携帯用パソコン、電子手帳や電卓のような情報処理装置などに用いられるのに好ましい。図１５は本発明にかかる例えば図１４に示したような液晶表示装置６１をディスプレイ用に備えた携帯電話７１を示す斜視図、図１６はその機能ブロック図である。携帯電話７１の正面にはダイアル入力用のテンキー等のボタンスイッチ７２を備え、その上方に液晶表示装置６１が配置され、上面にアンテナ７３が設けられている。しかして、ボタンスイッチ７２からダイアル等を入力すると、入力されたダイアル情報等が送信回路７４を通じてアンテナ７３から電話会社の基地局へ送信される。一方、入力されたダイアル情報等は液晶駆動回路７５へ送られ、液晶表示装置６１が液晶駆動回路７５により駆動されてダイアル情報等が液晶表示装置６１に表示される。 (Electronic organizer with liquid crystal display, etc.)
The liquid crystal display device according to the present invention is preferably used for a wireless information transmission device such as a mobile phone or a low power wireless device, a portable personal computer, and an information processing device such as an electronic organizer or a calculator. FIG. 15 is a perspective view showing a mobile phone 71 provided with a liquid crystal display device 61 as shown in FIG. 14 for display according to the present invention, and FIG. 16 is a functional block diagram thereof. A button switch 72 such as a numeric keypad for dial input is provided on the front of the mobile phone 71, a liquid crystal display device 61 is disposed above the button switch 72, and an antenna 73 is provided on the upper surface. When a dial or the like is input from the button switch 72, the input dial information or the like is transmitted from the antenna 73 to the base station of the telephone company through the transmission circuit 74. On the other hand, the input dial information and the like are sent to the liquid crystal drive circuit 75, and the liquid crystal display device 61 is driven by the liquid crystal drive circuit 75, and the dial information and the like are displayed on the liquid crystal display device 61.

　また、図１７は本発明にかかる例えば図１４に示したような液晶表示装置６１をディスプレイ用に備えた電子手帳８１を示す斜視図、図１８はその機能プロックである。電子手帳８１は、カバー８２を開くと、キー入力部８３と液晶表示装置６１を備えており、内部には液晶駆動回路８４や演算処理回路８５等が設けられている。しかして、例えばキー入力部８３からテンキーやカナキー等を入力すると、入力情報が液晶駆動回路８４に送られて液晶表示装置６１に表示される。ついで、演算キー等の制御キーを押すと、演算処理回路８５で所定の処理や演算が実行され、その結果が液晶駆動回路８４に送られて液晶表示装置６１に表示される。 FIG. 17 is a perspective view showing an electronic organizer 81 provided with a liquid crystal display device 61 as shown in FIG. 14, for example, for a display according to the present invention, and FIG. 18 is a functional block diagram thereof. When the cover 82 is opened, the electronic notebook 81 includes a key input unit 83 and a liquid crystal display device 61, and a liquid crystal drive circuit 84, an arithmetic processing circuit 85, and the like are provided inside. Thus, for example, when a ten key, a kana key, or the like is input from the key input unit 83, the input information is sent to the liquid crystal drive circuit 84 and displayed on the liquid crystal display device 61. Next, when a control key such as a calculation key is pressed, predetermined processing and calculation are executed in the calculation processing circuit 85, and the result is sent to the liquid crystal drive circuit 84 and displayed on the liquid crystal display device 61.

　なお、本発明は上記実施例に限定されるものではなく、本発明の範囲内で変更できることはいうまでもない。例えば、光学的境界面としては、溝に代えて孔を設けてもよいし、溝の表面、もしくは光入射面の点光源（発光部）両側に、印刷等によって透明屈折層（光散乱層）を形成してもよい。あるいは、溝は光入射面以外の面に設けても良い。これによって、有効領域外の導光板周縁に侵入した光をより効率良く有効領域内に集めることができるので、さらなる均一性の向上及び高輝度化が実現できる。 It should be noted that the present invention is not limited to the above-described embodiment, and can be modified within the scope of the present invention. For example, as the optical boundary surface, a hole may be provided instead of the groove, or a transparent refraction layer (light scattering layer) by printing or the like on the surface of the groove or on both sides of the point light source (light emitting portion) on the light incident surface. May be formed. Alternatively, the groove may be provided on a surface other than the light incident surface. Accordingly, light that has entered the periphery of the light guide plate outside the effective area can be more efficiently collected in the effective area, so that further improvement in uniformity and higher brightness can be realized.

　本発明は面光源装置であって、照明装置として用いることもでき、液晶表示装置等のバックライトなどにも使用することができる。 The present invention is a surface light source device, which can be used as a lighting device, and can also be used for a backlight of a liquid crystal display device or the like.

従来例による面光源装置を示す分解斜視図である。FIG. 9 is an exploded perspective view showing a conventional surface light source device. 同上の縦断面図である。It is a longitudinal cross-sectional view same as the above. 導光板の有効領域を示す平面図である。It is a top view which shows the effective area of a light guide plate. 本発明の実施例１による面光源装置を示す斜視図である。1 is a perspective view illustrating a surface light source device according to a first embodiment of the present invention. 同上の一部破断した縦断面図である。FIG. 空所によって光が導光板全体に拡散されている様子を示す説明図である。It is explanatory drawing which shows a mode that light is diffused in the whole light-guide plate by a space. 本発明の実施例２による面光源装置を示す斜視図である。FIG. 9 is a perspective view illustrating a surface light source device according to a second embodiment of the present invention. 同上の一部破断した縦断面図である。FIG. 本発明の実施例３による面光源装置を示す斜視図である。FIG. 9 is a perspective view illustrating a surface light source device according to a third embodiment of the present invention. 同上の一部破断した縦断面図である。FIG. 本発明の実施例４による面光源装置を示す平面図である。FIG. 11 is a plan view illustrating a surface light source device according to a fourth embodiment of the present invention. 同上の一部破断した縦断面図である。FIG. 本発明の面光源装置を用いた照明装置の斜視図である。FIG. 3 is a perspective view of a lighting device using the surface light source device of the present invention. 本発明の面光源装置を用いた液晶表示装置の分解斜視図である。1 is an exploded perspective view of a liquid crystal display device using the surface light source device of the present invention. 本発明にかかる液晶表示装置をディスプレイ用に備えた携帯電話を示す斜視図である。1 is a perspective view showing a mobile phone provided with a liquid crystal display device according to the present invention for a display. 同上の携帯電話において液晶表示装置を駆動するための構成を示すブロック図である。FIG. 2 is a block diagram showing a configuration for driving a liquid crystal display device in the mobile phone of the above. 本発明にかかる液晶表示装置をディスプレイ用に備えた電子手帳を示す斜視図である。1 is a perspective view showing an electronic organizer provided with a liquid crystal display device according to the present invention for a display. 同上の電子手帳において液晶表示装置を駆動するための構成を示すブロック図である。It is a block diagram which shows the structure for driving a liquid crystal display device in an electronic organizer same as the above.

符号の説明Explanation of reference numerals

　２２　導光板
　２３　光出射面
　２５　光入射面
　２６　発光部（光源）
　２７、４２、４４、４６　空所
　２９　発光素子
　Ｒ　有効領域
　Ｑ　隅部 Reference Signs List 22 light guide plate 23 light emitting surface 25 light incident surface 26 light emitting unit (light source)
27, 42, 44, 46 Vacancy 29 Light-emitting element R Effective area Q Corner

Claims (5)

光入射面より導入された光を閉じ込めて光出射面から外部へ取り出すための導光板と、導光板の光入射面側に配置された、導光板の幅と比較して小さな光源とを備え、
　光源から出射された光を光入射面から導光板内部に導いて導光板内部に閉じ込め、導光板の光出射面から外部へ取り出す面光源装置において、
　前記光源の前方において、導光板内を伝搬する光を拡散させて広げるための空所を導光板に形成したことを特徴とする面光源装置。 A light guide plate for confining the light introduced from the light incident surface and extracting the light from the light exit surface to the outside, and a light source smaller than the width of the light guide plate, disposed on the light incident surface side of the light guide plate,
In a surface light source device, the light emitted from the light source is guided from the light incident surface to the inside of the light guide plate, confined inside the light guide plate, and taken out from the light emission surface of the light guide plate to the outside.
A surface light source device, wherein a space for diffusing and expanding light propagating in the light guide plate is formed in the light guide plate in front of the light source. 光入射面より導入された光を閉じ込めて光出射面から外部へ取り出すための導光板と、導光板の光入射面側に配置された、導光板の幅と比較して小さな光源とを備え、
　光源から出射された光を光入射面から導光板内部に導いて導光板内部に閉じ込め、導光板の光出射面から外部へ取り出す面光源装置において、
　前記光源の前方において、導光板内を伝搬する光を導光板の有効領域の隅部へ向けて反射させるための空所を導光板に形成したことを特徴とする面光源装置。 A light guide plate for confining the light introduced from the light incident surface and extracting the light from the light exit surface to the outside, and a light source smaller than the width of the light guide plate, disposed on the light incident surface side of the light guide plate,
In a surface light source device, the light emitted from the light source is guided from the light incident surface to the inside of the light guide plate, confined inside the light guide plate, and taken out from the light emission surface of the light guide plate to the outside.
A surface light source device, wherein a space for reflecting light propagating in the light guide plate toward a corner of an effective area of the light guide plate is formed in the light guide plate in front of the light source. 　前記空所は、導光板を表裏に貫通していることを特徴とする、請求項１又は２に記載の面光源装置。 (3) The surface light source device according to (1) or (2), wherein the space penetrates the light guide plate from front to back. 　前記空所の一端は導光板の表裏のうち一方で開口し、前記空所の他端は導光板の表裏のうち他方と近接していることを特徴とする、請求項１又は２に記載の面光源装置。 The one end of the space is open on one of the front and back of the light guide plate, and the other end of the space is close to the other of the front and back of the light guide plate, according to claim 1 or 2, wherein Surface light source device. 　前記空所は、断面が三角形をしていることを特徴とする、請求項１又は２に記載の面光源装置。
The surface light source device according to claim 1, wherein the space has a triangular cross section.
JP2003316107A 2003-09-08 2003-09-08 Surface light source device Pending JP2004014527A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2003316107A JP2004014527A (en) 2003-09-08 2003-09-08 Surface light source device
CNA2004100564797A CN1595251A (en) 2003-09-08 2004-08-11 Surface light source device
KR1020040070263A KR20050025905A (en) 2003-09-08 2004-09-03 Device of surface light source
TW093126942A TW200515019A (en) 2003-09-08 2004-09-07 Surface light source device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003316107A JP2004014527A (en) 2003-09-08 2003-09-08 Surface light source device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP01983097A Division JP3516005B2 (en) 1997-01-17 1997-01-17 Surface light source device

Publications (1)

Publication Number Publication Date
JP2004014527A true JP2004014527A (en) 2004-01-15

Family

ID=30439025

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003316107A Pending JP2004014527A (en) 2003-09-08 2003-09-08 Surface light source device

Country Status (4)

Country Link
JP (1) JP2004014527A (en)
KR (1) KR20050025905A (en)
CN (1) CN1595251A (en)
TW (1) TW200515019A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005026222A (en) * 2003-07-01 2005-01-27 Samsung Electronics Co Ltd Backlight assembly and liquid crystal display device having the same
JP2006310049A (en) * 2005-04-27 2006-11-09 Dueller Corp Planar emitter
WO2007123173A1 (en) * 2006-04-19 2007-11-01 Omron Corporation Diffuser plate and surface light source apparatus
US7708444B2 (en) 2004-02-05 2010-05-04 Mitsubishi Denki Kabushiki Kaisha Surface light source device
JP2018182541A (en) * 2017-04-13 2018-11-15 日本電信電話株式会社 Radio device setting method and housing body

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100796793B1 (en) * 2001-09-08 2008-01-22 삼성전자주식회사 Organic Electro Luminescence panel and Organic Electro Luminescence Display using thereof
JP4741866B2 (en) * 2005-03-28 2011-08-10 Ｎｅｃ液晶テクノロジー株式会社 Light source device, display device using the same, and terminal device
JP4311366B2 (en) * 2005-03-28 2009-08-12 日本電気株式会社 Light source device, display device, terminal device, and optical member
JP2007005309A (en) 2005-06-23 2007-01-11 Samsung Electronics Co Ltd Light guide plate, backlight assembly and liquid crystal display device having it
CN1818460A (en) * 2006-03-14 2006-08-16 吴明番 Face light source with high brightness
WO2008080996A1 (en) * 2006-12-29 2008-07-10 Oy Modines Ltd Incoupling structure for lighting applications
KR101030116B1 (en) * 2010-12-02 2011-04-20 주식회사 에이앤피 테크 Light guiding panel and method and apparatus for manufacturing the same
KR102671594B1 (en) 2018-03-22 2024-06-03 닛토덴코 가부시키가이샤 Optical members and their manufacturing methods
DE102018211527A1 (en) * 2018-07-11 2020-01-16 Robert Bosch Gmbh light guide
TWI682222B (en) * 2018-09-27 2020-01-11 緯創資通股份有限公司 Light guiding device and indication apparatus with lighting function

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005026222A (en) * 2003-07-01 2005-01-27 Samsung Electronics Co Ltd Backlight assembly and liquid crystal display device having the same
US7708444B2 (en) 2004-02-05 2010-05-04 Mitsubishi Denki Kabushiki Kaisha Surface light source device
JP2006310049A (en) * 2005-04-27 2006-11-09 Dueller Corp Planar emitter
WO2007123173A1 (en) * 2006-04-19 2007-11-01 Omron Corporation Diffuser plate and surface light source apparatus
JP2018182541A (en) * 2017-04-13 2018-11-15 日本電信電話株式会社 Radio device setting method and housing body

Also Published As

Publication number Publication date
CN1595251A (en) 2005-03-16
TW200515019A (en) 2005-05-01
KR20050025905A (en) 2005-03-14

Similar Documents

Publication Publication Date Title
KR100308433B1 (en) Surface light source device, and liquid crystal display device, portable telephone and information terminal using surface light source device
JP3684737B2 (en) Surface light source device
JP4153776B2 (en) Planar light source device and liquid crystal display device using the same
JP4185721B2 (en) Illumination device and liquid crystal display device
JP4413186B2 (en) Planar light source device and display device using the same
KR100788105B1 (en) Planar light source and image display
US5883684A (en) Diffusively reflecting shield optically, coupled to backlit lightguide, containing LED&#39;s completely surrounded by the shield
JP4001736B2 (en) Surface light emitting device and liquid crystal display device
KR20070043102A (en) Light guide unit for point light source, backlight assembly having the light guide unit and display device having the same
JP3516005B2 (en) Surface light source device
JP2004014527A (en) Surface light source device
JPH10247412A (en) Surface light source device
KR102090457B1 (en) Liquid crystal display device
JP2004070189A (en) Liquid crystal display
JP2006054088A (en) Surface light-emitting device and liquid crystal display device
US7334930B2 (en) Light guide element and backlight module using the same
JP2006073223A (en) Surface light emitting device and liquid crystal display device
JPH10199317A (en) Surface light source device
JP2001215505A (en) Liquid crystal display device and mobile information terminal device
JPH10199321A (en) Surface light source device
JPH10199315A (en) Surface light source device
KR20060111997A (en) Backlight panel employing white light emitting diode
US20100157587A1 (en) Light-emitting unit and electronic device using the same
JP2002216526A (en) Surface lighting device
JP2004022175A (en) Surface light source, image display device, and light guide assembly

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20061018

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20061024

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20061220

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20070116