JP3316438B2 - Light guide plate, surface light source and liquid crystal display - Google Patents
Light guide plate, surface light source and liquid crystal displayInfo
- Publication number
- JP3316438B2 JP3316438B2 JP33707797A JP33707797A JP3316438B2 JP 3316438 B2 JP3316438 B2 JP 3316438B2 JP 33707797 A JP33707797 A JP 33707797A JP 33707797 A JP33707797 A JP 33707797A JP 3316438 B2 JP3316438 B2 JP 3316438B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- external
- guide plate
- external light
- intake
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- G02B6/0045—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 by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped 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
- G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133618—Illuminating devices for ambient light
Landscapes
- 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)
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、導光板、面光源及
び液晶表示装置に係り、更に詳しくは、太陽光や蛍光燈
などからの外光を取り入れる外光取入部が形成された導
光板、その導光板を用いた液晶表示装置のバックライト
用面光源及びデジタルスチルカメラやビデオカメラで被
写体を映し出す液晶モニターなどのバックライト方式の
液晶表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate, a surface light source, and a liquid crystal display device, and more particularly, to a light guide plate having an external light take-in portion for taking in external light from sunlight or a fluorescent lamp. The present invention relates to a surface light source for a backlight of a liquid crystal display device using the light guide plate and a backlight type liquid crystal display device such as a liquid crystal monitor for projecting a subject with a digital still camera or a video camera.
【０００２】[0002]
【従来の技術】 液晶表示装置のバックライト用面光源
として、透光性平板を導光板としたサイドライト方式の
ものが知られている。このような面光源では、透明な平
行平板や断面楔形平板からなる導光板の側端面の一方か
ら、蛍光燈などの光源からの光を入射させ、透光性平板
内部の全反射を利用して光を導光板の全域に遍く伝播さ
せ、その伝播した光の一部を導光板裏面の光散乱反射板
で臨界角未満の拡散反射光となし、導光板表面から拡散
光を放出する（実開昭５５−１６２２０１）。2. Description of the Related Art As a surface light source for a backlight of a liquid crystal display device, a side light type using a light-transmitting flat plate as a light guide plate is known. In such a surface light source, light from a light source such as a fluorescent lamp is incident from one of the side end surfaces of a light guide plate made of a transparent parallel flat plate or a wedge-shaped flat cross section, and the total internal reflection inside the translucent flat plate is used. Light is propagated throughout the light guide plate, and a part of the propagated light is made into a diffuse reflection light of less than a critical angle by a light scattering reflector on the back surface of the light guide plate, and diffuse light is emitted from the surface of the light guide plate (actually open). 55-162201).
【０００３】また、太陽光や室内光などの外光を補助光
源とする為に、導光板の側端面に外光取入部を設けたバ
ックライト用面光源も知られており、その外光取入部の
形状は断面円弧状となって一つのシリンドリカルレンズ
を構成している（特開平５−１１２４９）。[0003] Further, a surface light source for a backlight in which an external light intake portion is provided on a side end surface of a light guide plate in order to use external light such as sunlight or indoor light as an auxiliary light source is also known. The shape of the entrance portion is arc-shaped in cross section to constitute one cylindrical lens (JP-A-5-11249).
【０００４】[0004]
【発明が解決しようとする課題】 しかしながら、従来
の液晶表示装置の導光板では、図１に示すように、外光
取入部１ａの外光取入れ面と液晶パネル９が取り付けら
れる導光板１の光出射面１ｅ及び光反射面１ｄとが同一
面であって、液晶パネル９の方向（即ち、図の上方向）
及び光反射面１ｄより下の方向に突出していないので、
外光取入れ面の表面積を大きくすることができず、その
結果、外光を取り入れる効率が非常に悪く、消費電力の
低減が図れないという問題点があった。However, in the conventional light guide plate of the liquid crystal display device, as shown in FIG. 1, the light of the light guide plate 1 on which the liquid crystal panel 9 is mounted and the external light receiving surface of the external light receiving section 1a. The emission surface 1e and the light reflection surface 1d are the same surface, and are in the direction of the liquid crystal panel 9 (that is, the upward direction in the drawing).
And does not protrude below the light reflecting surface 1d.
The surface area of the external light intake surface cannot be increased, and as a result, there is a problem that the efficiency of external light intake is very poor, and power consumption cannot be reduced.
【０００５】本発明は、上記の問題点を解決する為にな
されたものであり、外光取り入れ効率を向上させること
により、主光源での消費電力を低減させること、更に
は、主光源を不要とすることが可能な導光板、面光源及
び液晶表示装置を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the power consumption of the main light source can be reduced by improving the efficiency of taking in external light. It is an object of the present invention to provide a light guide plate, a surface light source, and a liquid crystal display device that can be used.
【０００６】[0006]
【課題を解決するための手段】請求項１に係る本発明の
導光板は、上記の目的を達成する為に、樹脂で一体に成
形された導光板であって、外光を取り入れる外光取入部
と、前記外光取入部から取り入れた外光を出射する光出
射面と、前記光出射面と対向する一面であって前記外光
取入部から取り入れた外光を反射する光反射面とを具備
し、前記外光取入部は、シリンドリカルレンズであり、
前記光出射面及び前記光反射面より突出していることを
特徴とする。According to a first aspect of the present invention, there is provided a light guide plate which is formed integrally with a resin to achieve the above object. Input part, a light exit surface that emits external light taken from the external light intake unit, and a light reflection surface that reflects external light taken from the external light intake unit and is a surface facing the light exit surface. The external light intake section is a cylindrical lens,
It is characterized by projecting from the light emitting surface and the light reflecting surface.
【０００７】請求項２に係る本発明の導光板は、樹脂で
一体に成形された導光板であって、外光を取り入れる外
光取入部と、前記外光取入部から取り入れた外光を出射
する光出射面と、前記光出射面と対向する一面であって
前記外光取入部から取り入れた外光を反射する光反射面
とを具備し、前記外光取入部は、シリンドリカルレンズ
であり、前記光出射面及び前記光反射面より突出してい
ると共に、前記外光取入部の厚さ幅は、前記光出射面及
び前記光反射面の厚さ幅より厚いことを特徴とする。A light guide plate according to a second aspect of the present invention is a light guide plate integrally formed of resin, and includes an external light intake section for receiving external light, and an external light intake section for emitting external light from the external light intake section. A light-exiting surface, and a light-reflecting surface that reflects external light taken in from the external light-introducing portion on one surface facing the light-emitting surface, and the external light-introducing portion is a cylindrical lens, The light-emitting surface protrudes from the light-emitting surface and the light-reflecting surface, and a thickness width of the external light-receiving portion is larger than a thickness width of the light-emitting surface and the light-reflecting surface.
【０００８】請求項３に係る本発明の面光源は、光源
と、前記光源から照射された光を入射する光入射面と、
前記光入射面に対向し、外光を取り入れる外光取入部
と、前記光入射面から照射された光および前記外光取入
部から取り入れた外光を出射する光出射面と、前記光出
射面と対向する一面であって前記外光取入部から取り入
れた外光を反射する光反射面とを備え、前記外光取入部
が前記光出射面及び前記光反射面より突出し、樹脂で一
体に成形されている導光板とを具備し、前記光源は、光
入射面に略平行に近設されていることを特徴とする。請
求項４に係る本発明の液晶表示装置は、外光を取り入れ
る外光取入部と、前記外光取入部から取り入れた外光を
出射する光出射面と、前記光出射面と対向する一面であ
って前記外光取入部から取り入れた外光を反射する光反
射面とを備え、前記外光取入部が前記光出射面及び前記
光反射面より突出し、樹脂で一体に成形された導光板
と、前記導光板の光出射面に近接して取り付けられた液
晶パネルとを具備し、前記導光板の外光取入部は、前記
液晶パネルの表示面よりも光出射方向に突出していない
ことを特徴とする。According to a third aspect of the present invention, there is provided a surface light source, comprising: a light source; a light incident surface on which light emitted from the light source is incident;
An external light intake unit that faces the light incident surface and receives external light, a light emission surface that emits light emitted from the light incident surface and external light taken in from the external light intake unit, and the light emission surface A light reflecting surface that reflects external light taken in from the external light intake portion, and the external light intake portion protrudes from the light exit surface and the light reflection surface, and is integrally formed of resin. And a light guide plate, wherein the light source is provided substantially parallel to a light incident surface. The liquid crystal display device of the present invention according to claim 4 is an external light intake section for taking in external light, a light exit surface for emitting external light taken in from the external light intake section, and a surface facing the light exit surface. A light-reflecting surface that reflects external light taken from the external light-introducing portion, wherein the external light-introducing portion protrudes from the light-emitting surface and the light-reflecting surface, and a light guide plate integrally formed of resin. A liquid crystal panel mounted in close proximity to a light exit surface of the light guide plate, wherein an external light intake of the light guide plate does not protrude in a light exit direction from a display surface of the liquid crystal panel. And
【０００９】[0009]
【実施の形態】次に、本発明の実施の形態を、図面と共
に詳細に説明する。図２は、本発明に係る導光板の模式
図である。１は、導光板であり、金型を用いた樹脂成形
により導光板１が作製されると同時に、外光取入部１ａ
が導光板１の上部一端に形成される。１ａは、外光取入
部であり、太陽光や室内光などの外光を主たる光として
取り込む。この外光取入部１ａは、後述する光出射面１
ｅ及び光反射面１ｄよりも図の上下方向に突き出してお
り、その結果、従来の導光板に比較して外光取入れ面の
表面積が大きくなっている。外光取入部１ａの形状は、
断面略扇形状でその先端が円弧状のシリンドリカルレン
ズであり、そのレンズ効果によって、真上だけでなく真
横や斜め上下方からの外光を効率よく取り込む。但し、
外光取入部１ａは、扇形状のシリンドリカルレンズに限
定されず、例えば台形柱状でレンズが形成されないフラ
ット形状であってもよい。Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 is a schematic view of a light guide plate according to the present invention. Reference numeral 1 denotes a light guide plate, and the light guide plate 1 is manufactured by resin molding using a mold, and at the same time, an external light intake portion 1a is formed.
Is formed at one upper end of the light guide plate 1. Reference numeral 1a denotes an outside light taking-in section, which takes in outside light such as sunlight or room light as main light. This external light intake portion 1a is provided with a light exit surface 1 described later.
e and the light reflecting surface 1d protrude in the vertical direction in the drawing, and as a result, the surface area of the external light receiving surface is larger than that of the conventional light guide plate. The shape of the external light intake 1a is
This is a cylindrical lens having a substantially fan-shaped cross section and an arc-shaped tip, and the lens effect efficiently takes in external light not only directly above but also immediately beside or obliquely from above and below. However,
The external light intake portion 1a is not limited to a fan-shaped cylindrical lens, and may be, for example, a trapezoidal column having a flat shape in which no lens is formed.
【００１０】図５は、本発明に係る導光板の外光取入部
の正面図であり、特に外光取入部に採用可能な形状を例
示している。図５（Ａ）は、図２の導光板であり、略扇
形状で外光取入部１ａの左側が断面円弧状で、右側が斜
め直線状となっている。図５（Ｂ）は、略台形状で外光
取入部１ａの左側がフラットで、右側が斜め直線状とな
っている。FIG. 5 is a front view of an external light intake section of the light guide plate according to the present invention, and particularly exemplifies a shape that can be adopted for the external light intake section. FIG. 5 (A) shows the light guide plate of FIG. 2, which is substantially fan-shaped and has an arc-shaped cross section on the left side of the external light intake portion 1a and an oblique straight line on the right side. In FIG. 5B, the trapezoidal shape is substantially trapezoidal, the left side of the external light intake section 1a is flat, and the right side is oblique straight.
【００１１】図５（Ｃ）は、外光取入部１ａの左右共が
断面円弧状となっている。図５（Ｄ）は、外光取入部１
ａの左側が断面円弧状で、右側が垂直な直線状となって
いる。図５（Ｅ）は、図５（Ｂ）の導光板の外光取入部
１ａの左側に複数の魚眼レンズ１ｆを形成している。In FIG. 5C, the left and right sides of the external light intake portion 1a are arc-shaped in cross section. FIG. 5D shows the external light intake unit 1.
The left side of “a” has an arc-shaped cross section and the right side has a vertical straight line. In FIG. 5E, a plurality of fisheye lenses 1f are formed on the left side of the external light intake 1a of the light guide plate in FIG. 5B.
【００１２】ここで図２に戻り説明を続ける。１ｃは、
光入射面であり、以下で説明するように、光入射面１ｃ
に略平行に近設された光源（図示せず）から照射された
光が入射する。但し、２つの側面１ｂの一方又は両方に
光源を配置して光入射面とすることも可能である。１ｄ
は、光反射面であり、樹脂成形の後に、光が漏洩するの
を防ぎ反射効率を高める為に、ドット印刷を行なってか
らアルミなどの反射板が取り付けられる（図示せず）。Returning to FIG. 2, the description will be continued. 1c is
A light incident surface, as described below.
Light emitted from a light source (not shown) disposed substantially parallel to the light enters. However, it is also possible to arrange a light source on one or both of the two side surfaces 1b to be a light incident surface. 1d
Is a light reflecting surface, and after a resin molding, in order to prevent light from leaking and to enhance the reflection efficiency, a reflecting plate such as aluminum is attached after performing dot printing (not shown).
【００１３】１ｅは、光出射面であり、外光取入部１ａ
および光入射面１ｃから入射した光が、光反射面１ｄや
導光板１の２つの側面１ｂで反射して、入射光の殆どが
最終的に光出射面１ｅから均一な指向性を有する合成光
として出射される。尚、この側面１ｂには、光の漏洩を
防止する為に、白色テープなどの漏洩防止部材が取り付
けられる。Reference numeral 1e denotes a light exit surface, which is an external light intake section 1a.
In addition, light incident from the light incident surface 1c is reflected by the light reflecting surface 1d and the two side surfaces 1b of the light guide plate 1, and almost all of the incident light finally has a uniform directivity from the light emitting surface 1e. Is emitted. In addition, a leakage prevention member such as a white tape is attached to the side surface 1b in order to prevent light leakage.
【００１４】導光板１の材料としては、透光性材料の中
から選択され、通常はアクリル又はポリカーボネートの
樹脂が用いられる。導光板の形状は平行平板や断面楔形
平板で、その厚みは、通常１〜１０ｍｍ程度のものが用
いられる。また、その他の透光性材料としては、ポリメ
タアクリル酸メチル，ポリアクリル酸メチル等のアクリ
ル酸エステル又はメタアクリル酸エステルの単独若しく
は共重合体，ポリエチレンテレフタレート，ポリブチレ
ンテレフタレート等のポリエステル，ポリカーボネー
ト，ポリスチレン、ポリメチルペンテン等熱可塑性樹
脂、或いは紫外線又は電子線で架橋した、多官能のウレ
タンアクリレート、ポリエステルアクリレート等のアク
リレート、不飽和ポリエステル等透明な樹脂，透明な硝
子等、透明なセラミックス等が用いられる。The material of the light guide plate 1 is selected from light-transmissive materials, and usually acrylic or polycarbonate resin is used. The shape of the light guide plate is a parallel flat plate or a flat wedge-shaped flat plate, and the thickness thereof is generally about 1 to 10 mm. Other translucent materials include acrylate or methacrylate homo- or copolymers such as polymethyl methacrylate and polymethyl acrylate, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polycarbonates, and the like. Thermoplastic resins such as polystyrene and polymethylpentene, or acrylates such as polyfunctional urethane acrylates and polyester acrylates cross-linked by ultraviolet rays or electron beams, transparent resins such as unsaturated polyesters, transparent glass, transparent ceramics, etc. are used. Can be
【００１５】つぎに、図２を用いて本発明に係る導光板
の動作について説明する。導光板１の外光取入部１ａに
は、室外においては太陽光が、また室内においては蛍光
燈などからの外光が効率よく入射するので、本発明に係
る導光板を具備する液晶表示装置をデジタルスチルカメ
ラやビデオカメラで被写体を映し出す液晶モニターなど
に使用する場合には、光源を点灯させる必要がない程に
十分な照明を行なうことができ、その結果、各種カメラ
装置自身の消費電力の低減を図ることが可能となる。Next, the operation of the light guide plate according to the present invention will be described with reference to FIG. Since the sunlight enters the outside light intake portion 1a of the light guide plate 1 outdoors and the outside light from a fluorescent lamp or the like efficiently enters the room, a liquid crystal display device including the light guide plate according to the present invention is provided. When used in a digital still camera or a video camera to display an image on an LCD monitor, etc., sufficient lighting can be provided so that the light source does not need to be turned on. As a result, the power consumption of various camera devices themselves is reduced. Can be achieved.
【００１６】また、光源を点灯させた場合には、光入射
面１ｃから入射した光源からの光及び外光取入部１ａか
ら取り入れられた外光が光反射面１ｄや導光板１の２つ
の側面１ｂで反射して、光出射面１ｅから均一な指向性
を有する合成光として出射される。図３は、本発明に係
る面光源を示す概略図である。When the light source is turned on, the light from the light source incident on the light incident surface 1c and the external light introduced from the external light receiving portion 1a receive light from the light reflecting surface 1d and the two side surfaces of the light guide plate 1. The light is reflected by 1b, and is emitted from the light emission surface 1e as combined light having uniform directivity. FIG. 3 is a schematic diagram showing a surface light source according to the present invention.
【００１７】２は、面光源であり、本発明に係る導光板
１、蛍光管などの光源３及び各種制御回路（図示せず）
などで構成されいる。この制御回路には、例えば導光板
１の光出射面から出射される光の総量を検知して、出射
光量が最適になるように光源３に電力を調整して供給す
る回路も含まれる。光源３から出射された光はリフレク
タ４で反射され導光板１の光入射面１ｃから、また自然
光などの外光は導光板１の外光取入部１ａから導光板１
の内部に入り、光反射面１ｄの下部に取り付けられた反
射板５や側端面１ｂで反射され集束を繰り返し、導光板
１の光出射面１ｅから拡散板６に出射される。更に、拡
散板６に入射した光は、拡散板６及びレンズシート７に
よって所望の角度範囲内に均一等方的に拡散されてレン
ズシート７から出射される。但し、用途によっては、本
面光源２から蛍光管や制御回路（図示せず）などを取り
除いて、外光だけを取り入れるタイプの面光源とするこ
とも可能である。Reference numeral 2 denotes a surface light source, which is a light guide plate 1 according to the present invention, a light source 3 such as a fluorescent tube, and various control circuits (not shown).
And so on. The control circuit also includes, for example, a circuit that detects the total amount of light emitted from the light emission surface of the light guide plate 1 and adjusts and supplies power to the light source 3 so that the amount of emitted light is optimized. Light emitted from the light source 3 is reflected by the reflector 4 and is incident on the light incident surface 1c of the light guide plate 1, and external light such as natural light is transmitted from the external light receiving portion 1a of the light guide plate 1.
, Is reflected by the reflection plate 5 and the side end surface 1b attached to the lower part of the light reflection surface 1d, repeatedly focused, and emitted from the light exit surface 1e of the light guide plate 1 to the diffusion plate 6. Further, the light incident on the diffusion plate 6 is uniformly and isotropically diffused within a desired angle range by the diffusion plate 6 and the lens sheet 7 and is emitted from the lens sheet 7. However, depending on the application, it is also possible to remove the fluorescent tube and the control circuit (not shown) from the main surface light source 2 to obtain a surface light source of a type that receives only external light.
【００１８】図４は、本発明に係る面光源を具備する液
晶表示装置を示す模式図であり、図４（Ａ）は外光取入
部が液晶パネル９の表示面よりも光出射方向に突出して
おり、一方、図４（Ｂ）は外光取入部が液晶パネル９の
表示面よりも光出射方向に突出していないことを示して
いる。これら２種類の液晶表示装置は、共に外光取入れ
効果に優れているが、図４（Ｂ）のものは外光取入部が
液晶パネル９の表示面よりも突出していないことから、
当該外光取入部自身の損傷や使用者の怪我などを防止し
得るばかりかデザイン的な自由度を損なうこともない。FIG. 4 is a schematic view showing a liquid crystal display device provided with the surface light source according to the present invention. FIG. 4A shows an external light intake portion protruding from the display surface of the liquid crystal panel 9 in the light emission direction. On the other hand, FIG. 4B shows that the external light intake portion does not protrude beyond the display surface of the liquid crystal panel 9 in the light emission direction. These two types of liquid crystal display devices are both excellent in the effect of taking in external light. However, in FIG. 4B, since the external light taking-in portion does not protrude from the display surface of the liquid crystal panel 9,
Not only can the external light intake itself be prevented from being damaged or the user being injured, but also the degree of freedom in design is not impaired.
【００１９】８は、液晶表示装置であり、液晶パネル９
及び本発明に係る面光源２で構成される。上述した面光
源２から均一等方的に拡散されて出射した光は、液晶パ
ネル９に導かれる。但し、面光源２から光源３を取り除
き、導光板１からの外光だけを利用する液晶表示装置で
あってもよい。Reference numeral 8 denotes a liquid crystal display, and a liquid crystal panel 9
And the surface light source 2 according to the present invention. Light that is uniformly and isotropically diffused and emitted from the surface light source 2 described above is guided to the liquid crystal panel 9. However, a liquid crystal display device that removes the light source 3 from the surface light source 2 and uses only external light from the light guide plate 1 may be used.
【００２０】[0020]
【発明の効果】 以上説明した様に、本発明に係る導光
板によれば、外光取入部が光出射面及び光反射面より突
出しているので、従来の導光板に比較して外光取入れ面
の表面積を大きくすることができ、太陽光や室内光など
の外光を主たる光として効率よく取り込むことが可能と
なる。本発明に係る面光源及び液晶表示装置によれば、
上記導光板を使用することにより外光取り入れ効率が向
上するので、一定の出射光量を得る場合には、光源に供
給する電力を低減させることが可能となるばかりでな
く、用途に応じて光源を不要とすることが可能となる。As described above, according to the light guide plate of the present invention, the external light intake portion protrudes from the light exit surface and the light reflection surface. The surface area of the surface can be increased, and external light such as sunlight or indoor light can be efficiently taken in as main light. According to the surface light source and the liquid crystal display device according to the present invention,
The use of the light guide plate improves the external light intake efficiency, so that when obtaining a constant amount of emitted light, not only can the power supplied to the light source be reduced, but also the light source can be changed depending on the application. It becomes possible to make it unnecessary.
【００２１】また、本発明に係る液晶表示装置によれ
ば、導光板の外光取入部が液晶パネルの表示面よりも突
出していないので、装置の使用者が怪我を引き起こす要
因が少なく安全性を確保でき、更には、当該外光取入部
自身の損傷防止やデザイン的な自由度を保持できる。Further, according to the liquid crystal display device of the present invention, since the external light receiving portion of the light guide plate does not protrude beyond the display surface of the liquid crystal panel, there are few factors that cause the user of the device to be injured and the safety is reduced. In addition, it is possible to prevent damage to the external light intake unit itself and to maintain a degree of freedom in design.
【図１】従来の液晶表示装置の模式図である。FIG. 1 is a schematic view of a conventional liquid crystal display device.
【図２】本発明に係る導光板の模式図である。FIG. 2 is a schematic view of a light guide plate according to the present invention.
【図３】本発明に係る面光源を示す模式図である。FIG. 3 is a schematic view showing a surface light source according to the present invention.
【図４】本発明に係る面光源を具備する液晶表示装置を
示す模式図である。FIG. 4 is a schematic view showing a liquid crystal display device including the surface light source according to the present invention.
【図５】本発明に係る導光板の外光取入部の正面図であ
る。FIG. 5 is a front view of an external light intake section of the light guide plate according to the present invention.
１ 導光板 １ａ 外光取入部 １ｂ 側面 １ｃ 光入射面 １ｄ 光反射面 １ｅ 光出射面 ２ 面光源 ３ 光源 ５ 反射板 ６ 拡散板 ７ レンズシート ８ 液晶表示装置 ９ 液晶パネル DESCRIPTION OF SYMBOLS 1 Light guide plate 1a External light intake part 1b Side surface 1c Light incidence surface 1d Light reflection surface 1e Light emission surface 2 Surface light source 3 Light source 5 Reflection plate 6 Diffusion plate 7 Lens sheet 8 Liquid crystal display device 9 Liquid crystal panel
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平８−87010（ＪＰ，Ａ) 特開 平５−11249（ＪＰ，Ａ) 特開 平11−133236（ＪＰ，Ａ) 実開 昭62−47297（ＪＰ，Ｕ) 実開 昭57−195175（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F21V 8/00 601 G02F 1/13357 G02B 6/00 331 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-87010 (JP, A) JP-A-5-11249 (JP, A) JP-A-11-133236 (JP, A) 47297 (JP, U) Actually open 57-195175 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F21V 8/00 601 G02F 1/13357 G02B 6/00 331
Claims (4)
と、 前記光出射面と対向する一面であって前記外光取入部か
ら取り入れた外光を反射する光反射面とを具備し、 前記外光取入部は、シリンドリカルレンズであり、前記
光出射面及び前記光反射面より突出していること、 を特徴とする導光板。1. A light guide plate integrally formed of resin, comprising: an external light intake section for receiving external light; a light emission surface for emitting external light introduced from the external light intake section; And a light reflecting surface that reflects external light taken in from the external light intake unit, and the external light intake unit is a cylindrical lens, and is a surface facing the light exit surface and the light reflection surface. A light guide plate that protrudes.
と、 前記光出射面と対向する一面であって前記外光取入部か
ら取り入れた外光を反射する光反射面とを具備し、 前記外光取入部は、シリンドリカルレンズであり、前記
光出射面及び前記光反射面より突出していると共に、前
記外光取入部の厚さ幅は、前記光出射面及び前記光反射
面の厚さ幅より厚いこと、 を特徴とする導光板。2. A light guide plate integrally formed of a resin, comprising: an external light intake section for receiving external light; a light exit surface for emitting external light introduced from the external light intake section; And a light reflecting surface that reflects external light taken in from the external light intake unit, and the external light intake unit is a cylindrical lens, and is a surface facing the light exit surface and the light reflection surface. The light guide plate, wherein the light guide plate protrudes, and a thickness width of the external light intake portion is larger than a thickness width of the light exit surface and the light reflection surface.
光入射面に対向し、外光を取り入れる外光取入部と、前
記光入射面から照射された光および前記外光取入部から
取り入れた外光を出射する光出射面と、前記光出射面と
対向する一面であって前記外光取入部から取り入れた外
光を反射する光反射面とを備え、前記外光取入部が前記
光出射面及び前記光反射面より突出し、樹脂で一体に成
形されている導光板とを具備し、 前記光源は、光入射面に略平行に近設されていること、 を特徴とする面光源。3. A light source, a light incident surface on which light emitted from the light source is incident, and
An external light intake section facing the light incident surface and receiving external light;
From the light irradiated from the light incident surface and the external light intake section
A light emitting surface for emitting the external light taken in, and the light emitting surface;
Opposing surface, outside taken in from the outside light intake section
A light reflecting surface for reflecting light, wherein the external light intake section is
It protrudes from the light emitting surface and the light reflecting surface and is integrally formed of resin.
A light guide plate that is shaped, and wherein the light source is provided substantially parallel to a light incident surface .
取入部から取り入れた外光を出射する光出射面と、前記
光出射面と対向する一面であって前記外光取入部から取
り入れた外光を反射する光反射面とを備え、前記外光取
入部が前記光出射面及び前記光反射面より突出し、樹脂
で一体に成形された導光板と、 前記導光板の光出射面に近接して取り付けられた液晶パ
ネルとを具備し、 前記導光板の外光取入部は、前記液晶パネルの表示面よ
りも光出射方向に突出していないこと、 を特徴とする液晶表示装置。4. An external light intake section for receiving external light, and said external light
A light emitting surface for emitting external light taken from the intake unit,
One surface facing the light exit surface and taken from the outside light intake section
A light reflecting surface for reflecting the external light that has entered.
The input portion protrudes from the light exit surface and the light reflection surface, and a resin
And integrally molded light guide plate in, comprising a liquid crystal panel mounted in proximity to the light emitting surface of the light guide plate, outside light intake portion of said light guide plate, the display surface of the liquid crystal panel
The liquid crystal display device does not protrude in the light emitting direction .
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33707797A JP3316438B2 (en) | 1997-12-08 | 1997-12-08 | Light guide plate, surface light source and liquid crystal display |
| TW87115139A TW420765B (en) | 1997-10-31 | 1998-09-11 | Lightguide plate, face light source using lightguide plate thereof and liquid crystal display device |
| US09/183,727 US6273577B1 (en) | 1997-10-31 | 1998-10-30 | Light guide plate, surface light source using the light guide plate, and liquid crystal display using the surface light source |
| CN 98121436 CN1211693C (en) | 1997-10-31 | 1998-10-30 | Light conducting plate, area source and liquid crystal display apparatus using the same light conducting plate |
| KR1019980053432A KR100308632B1 (en) | 1997-12-08 | 1998-12-07 | Light guiding plate, plane light source and liquid crystal display apparatus using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33707797A JP3316438B2 (en) | 1997-12-08 | 1997-12-08 | Light guide plate, surface light source and liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11174438A JPH11174438A (en) | 1999-07-02 |
| JP3316438B2 true JP3316438B2 (en) | 2002-08-19 |
Family
ID=18305226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33707797A Expired - Fee Related JP3316438B2 (en) | 1997-10-31 | 1997-12-08 | Light guide plate, surface light source and liquid crystal display |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3316438B2 (en) |
| KR (1) | KR100308632B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007064063A1 (en) * | 2005-12-01 | 2007-06-07 | Cheil Industries Inc. | Light guide panel for tft-lcd back light unit and tft-lcd back light unit and tft-lcd device having the same |
| WO2014129299A1 (en) * | 2013-02-22 | 2014-08-28 | 日本電気硝子株式会社 | Light guide plate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0511249A (en) * | 1991-07-08 | 1993-01-19 | Hitachi Ltd | Liquid crystal display device |
-
1997
- 1997-12-08 JP JP33707797A patent/JP3316438B2/en not_active Expired - Fee Related
-
1998
- 1998-12-07 KR KR1019980053432A patent/KR100308632B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR100308632B1 (en) | 2001-10-20 |
| JPH11174438A (en) | 1999-07-02 |
| KR19990062865A (en) | 1999-07-26 |
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