JP2001297617A - Front light type illumination device - Google Patents

Front light type illumination device

Info

Publication number
JP2001297617A
JP2001297617A JP2000110300A JP2000110300A JP2001297617A JP 2001297617 A JP2001297617 A JP 2001297617A JP 2000110300 A JP2000110300 A JP 2000110300A JP 2000110300 A JP2000110300 A JP 2000110300A JP 2001297617 A JP2001297617 A JP 2001297617A
Authority
JP
Japan
Prior art keywords
light
liquid crystal
guide plate
crystal display
led
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
JP2000110300A
Other languages
Japanese (ja)
Inventor
Kenichi Koya
賢一 小屋
Toshiro Horiuchi
俊郎 堀内
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP2000110300A priority Critical patent/JP2001297617A/en
Publication of JP2001297617A publication Critical patent/JP2001297617A/en
Pending legal-status Critical Current

Links

Landscapes

  • Light Guides In General And Applications Therefor (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a front light type illumination device, capable of converting the wavelength to white color using a high luminance LED emitting blue-colored light and lighting uniformly and moreover is small-sized. SOLUTION: The front light type illumination device is provided with an light guide plate 2 disposed, so as to be confronted with the display side of a liquid crystal display panel 21 where a micro prism 2b is formed on the observation surface of emission. The light guiding plate 2 is of a shape, jutting out from the outer of the liquid crystal display panel 21 toward the outside to form a micro prism 2a on the end surface jutted out. The blue color emitting LED 3 is installed integrally at the one end of the light guiding plate 2 which is positioned deviant from the liquid crystal display panel 21 and a wavelength converting layer 4 containing a luminous material is provided between the LED 3 and a region confronting with the display screen of the liquid crystal panel 21 for converting blue color emission into white-color emission.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、反射型のカラー液
晶表示ディスプレイに好適に利用できるフロントライト
型照明装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front light type illuminating device which can be suitably used for a reflection type color liquid crystal display.

【0002】[0002]

【従来の技術】最近、携帯電話等の表示部にはカラー液
晶表示ディスプレイが利用されてきているが、消費電力
の低減と軽量化・薄型化のためにバックライトをなく
し、反射型の液晶パネルとフロントライト型の照明装置
の組み合わせで対応しようとする動きがある。このフロ
ントライト型の照明装置は、従来のバックライトと同様
に面発光装置とした点では基本的に同じであり、たとえ
ば特開平11−184386号公報に記載されたものが
ある。
2. Description of the Related Art In recent years, a color liquid crystal display has been used for a display portion of a cellular phone or the like. However, a backlight is eliminated to reduce power consumption and to reduce the weight and thickness of the display. There is a movement to cope with the combination of the front light type lighting device. This front light type illumination device is basically the same as a conventional backlight in that it is a surface light emitting device, and for example, there is an illumination device described in JP-A-11-184386.

【0003】先の公報に記載のフロントライト型の照明
装置は、面発光用の導光板の一端面側に対峙させてチッ
プ型のLEDを配列し、これらのLEDからの光を導光
板の端面から入射、導光板の発光観測面側に形成したマ
イクロプリズムによって光を液晶パネル側に照射させる
というものである。そして、LEDから一様に導光板に
光が拡散して入射するように、LEDと導光板の端面と
の間に拡散層を配置した構成となっている。このような
構成では、LEDが点光源であっても、拡散層を備えて
いるので、マイクロプリズムの溝に垂直方向にライン状
の光がLEDから照射されて液晶が不均一に見えるよう
な従来の課題を解決でき、ほぼ均一な面照明装置が実現
できる。
In the front light type illuminating device described in the above-mentioned publication, chip-type LEDs are arranged so as to face one end of a light emitting plate for surface light emission, and light from these LEDs is transmitted to the end surface of the light guiding plate. The light is applied to the liquid crystal panel side by a microprism formed on the light emission observation surface side of the light guide plate. Then, a diffusion layer is arranged between the LED and the end face of the light guide plate so that the light is uniformly diffused from the LED and enters the light guide plate. In such a configuration, even if the LED is a point light source, since the LED is provided with a diffusion layer, linear light is radiated from the LED in a direction perpendicular to the groove of the microprism, and the liquid crystal looks uneven. Can be solved, and a substantially uniform surface illumination device can be realized.

【0004】[0004]

【発明が解決しようとする課題】近年になって、GaN
系化合物半導体を利用した青色発光のLEDが開発さ
れ、従来の他の色のLEDに比べて高輝度の青色発光が
得られるようになった。この青色発光のLEDをフロン
トライト型の照明装置の光源として利用すれば、高輝度
の発光による液晶の表示が得られる。
SUMMARY OF THE INVENTION In recent years, GaN
2. Description of the Related Art A blue light emitting LED using a system compound semiconductor has been developed, and blue light emission with higher luminance than conventional LEDs of other colors has been obtained. If this blue light emitting LED is used as a light source of a front light type illuminating device, a liquid crystal display with high luminance light emission can be obtained.

【0005】しかしながら、液晶表示ディスプレイの場
合では、表示画像を鮮明化するため白色発光が最も好ま
しいとされており、青色発光のままでは汎用性に欠ける
面がある。
[0005] However, in the case of a liquid crystal display, white light emission is considered to be most preferable in order to sharpen a displayed image, and there is a surface lacking in versatility when blue light is left.

【0006】また、先の公報に記載のフロントライト型
の照明装置では、導光板とLEDとは別体に配置され、
しかも導光板とLEDの間に拡散層が必要なため、装置
全体の嵩が大きくなるだけでなく、光の利用効率が悪
く、照明装置を明るくするためにLEDの数を増やす必
要がある。さらに、光源として用いる白色チップLED
では、LEDと波長変換のための蛍光体樹脂が直に接触
しているためLEDに通電した際、LEDの発熱で樹脂
の変色を伴い、安定的な白色光を得ることができないと
いう面がある。
Further, in the front light type lighting device described in the above-mentioned publication, the light guide plate and the LED are arranged separately,
In addition, since a diffusion layer is required between the light guide plate and the LED, not only the bulk of the entire device is increased, but also the light use efficiency is poor, and the number of LEDs needs to be increased in order to brighten the lighting device. Furthermore, white chip LED used as light source
Therefore, when the LED is energized because the LED and the phosphor resin for wavelength conversion are in direct contact with each other, the heat generated by the LED causes the resin to be discolored, so that stable white light cannot be obtained. .

【0007】そこで、本発明は、高輝度の青色発光のL
EDを用いて白色に波長変換し、しかも小型化が可能で
光の利用効率が良く、安定的な白色光を実現できるフロ
ントライト型の照明装置を提供することを目的とする。
Accordingly, the present invention provides a high-luminance blue light-emitting L
It is an object of the present invention to provide a front-light-type lighting device that can convert the wavelength to white using an ED, can be reduced in size, has good light use efficiency, and can realize stable white light.

【0008】[0008]

【課題を解決するための手段】本発明は、液晶表示パネ
ルの表示面側に対峙して配置され且つ発光観測面側にマ
イクロプリズムを形成した導光板を含むフロントライト
型の照明装置であって、前記導光板を前記液晶表示パネ
ルの外郭よりも外に突き出した形状としてその突き出し
端面にマイクロプリズムを形成し、前記液晶表示パネル
から外れた位置であって前記導光板の一端側に青色発光
のLEDを一体に組み込み、前記LEDと前記液晶表示
パネルの表示面に対峙する領域との間に蛍光物質を含み
青色発光を白色発光に波長変換する波長変換層を備えて
いることを特徴とする。
SUMMARY OF THE INVENTION The present invention is directed to a front light type illuminating device including a light guide plate which is arranged to face a display surface side of a liquid crystal display panel and has a microprism formed on a light emission observation surface side. Forming a microprism on the protruding end surface of the light guide plate so as to protrude outside the outer contour of the liquid crystal display panel, and emitting blue light on one end side of the light guide plate at a position off the liquid crystal display panel. An LED is integrally incorporated, and a wavelength conversion layer that contains a fluorescent substance and converts blue light emission to white light emission is provided between the LED and a region facing the display surface of the liquid crystal display panel.

【0009】本発明によれば、高輝度の青色発光のLE
Dを用いて白色に波長変換し、しかも小型化が可能で光
の利用効率が良いフロントライト型の照明装置を得るこ
とができる。
According to the present invention, LE of high-luminance blue light emission is provided.
It is possible to obtain a front-light-type lighting device that converts the wavelength to white light using D and that can be reduced in size and has high light use efficiency.

【0010】[0010]

【発明の実施の形態】請求項1に記載の発明は、液晶表
示パネルの表示面側に対峙して配置され且つ発光観測面
側にマイクロプリズムを形成した導光板を含むフロント
ライト型の照明装置であって、前記導光板を前記液晶表
示パネルの外郭よりも外に突き出した形状としてその突
き出し端面にマイクロプリズムを形成し、前記液晶表示
パネルから外れた位置であって前記導光板の一端側に青
色発光のLEDを一体に組み込み、前記LEDと前記液
晶表示パネルの表示面に対峙する領域との間に蛍光物質
を含み青色発光を白色発光に波長変換する波長変換層を
備えていることを特徴とするフロントライト型照明装置
であり、波長変換層によってLEDからの光を白色に変
換すると同時に拡散させることにより導光板内を効率良
く導光でき、しかも均一な面照明ができるという作用を
有する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a front light type illuminating device including a light guide plate which is arranged to face a display surface side of a liquid crystal display panel and has a microprism formed on a light emission observation surface side. And forming a microprism on the protruding end surface of the light guide plate as a shape protruding outside the outer contour of the liquid crystal display panel, at a position off the liquid crystal display panel and at one end side of the light guide plate. A blue light emitting LED is integrally incorporated, and a wavelength conversion layer is provided between the LED and a region facing the display surface of the liquid crystal display panel, the fluorescent material being included, and a wavelength conversion layer for converting blue light emission to white light emission. The light from the LED is converted into white light by the wavelength conversion layer and diffused at the same time by the wavelength conversion layer, so that light can be efficiently guided in the light guide plate. It has an effect that it is uniform plane illumination.

【0011】請求項2に記載の発明は、前記導光板の突
き出し端側の外郭で、前記LEDと対峙する領域を反射
させる反射面形状とするとともにこの前記反射面にマイ
クロプリズムを有していることを特徴とする請求項1記
載のフロントライト型照明装置であり、LEDからの光
を反射面形状部分で反射させることにより導光板内を効
率良く導光させることができ、さらに反射面にマイクロ
プリズムを有しているためLEDからの光を傾斜面のマ
イクロプリズムで反射・屈折させることにより導光板内
への導光を向上させる作用を有する。
According to a second aspect of the present invention, the outer surface of the light guide plate on the protruding end side has a reflecting surface shape for reflecting a region facing the LED, and the reflecting surface has a microprism. 2. The front light type illuminating device according to claim 1, wherein the light from the LED is reflected by the reflecting surface portion to efficiently guide the light in the light guide plate. Due to the presence of the prism, the light from the LED is reflected and refracted by the microprisms on the inclined surface to improve the light guide into the light guide plate.

【0012】以下、本発明の実施の形態を図面に基づい
て説明する。
An embodiment of the present invention will be described below with reference to the drawings.

【0013】図1は本実施の形態におけるフロントライ
ト型照明装置による液晶表示構造を示す要部の一部切欠
側面図、図2は導光板をその発光観測面側から見た正面
図である。
FIG. 1 is a partially cutaway side view of a main part showing a liquid crystal display structure of a front light type illuminating device according to the present embodiment, and FIG. 2 is a front view of a light guide plate viewed from a light emission observation surface side.

【0014】図1に示すように、液晶を封入した液晶表
示パネル21の裏面側に反射板22が配置され、表面側
にフロントライト型の照明装置1が配置されている。こ
の照明装置1は、透明なアクリル樹脂によって形成され
た導光板2を主体とし、この導光板2の中に高輝度青色
発光のLED3と、このLED3からの青色発光を白色
に波長変換するための波長変換層4を一体に組み込んだ
ものである。
As shown in FIG. 1, a reflection plate 22 is disposed on the back side of a liquid crystal display panel 21 in which liquid crystal is sealed, and a front light type illumination device 1 is disposed on the front side. The illuminating device 1 mainly includes a light guide plate 2 formed of a transparent acrylic resin. The light guide plate 2 includes an LED 3 for emitting high-intensity blue light and a wavelength conversion device for converting the blue light emitted from the LED 3 into white light. The wavelength conversion layer 4 is integrally incorporated.

【0015】導光板2はその下端側及び発光観測面側
(図1において左端面側)のそれぞれにマイクロプリズ
ム2a,2bを形成したものである。下端側のマイクロ
プリズム2aは、図2に拡大して示すように山どうしの
間の角度βを90°とし、山の高さを160μm程度と
し、ピッチを320μm程度としたほぼ二等辺三角形の
形状のものである。プリズム高さ×2=プリズムピッチ
の数値関係が成り立つようにプリズムの形状を決めるこ
とにより、反射・屈折を基本に非常に効率良く光を導光
できる。
The light guide plate 2 has micro prisms 2a and 2b formed on the lower end side and the emission observation surface side (the left end side in FIG. 1), respectively. The micro prism 2a at the lower end has a substantially isosceles triangular shape in which the angle β between the peaks is 90 °, the height of the peaks is about 160 μm, and the pitch is about 320 μm, as shown in FIG. belongs to. By determining the shape of the prism so that the numerical relationship of prism height × 2 = prism pitch holds, light can be guided very efficiently based on reflection and refraction.

【0016】また、発光観測面側のマイクロプリズム2
bは図1に拡大して示すように山の頂角の角度αを16
5°程度とし、山の高さが7μm程度でピッチが300
μm程度とした不等辺三角形の形状のものである。プリ
ズム高さ≪プリズムピッチ、LED側の角度α1と反対
側の角度α2の関係がα1>α2の関係が成り立つよう
にプリズムの形状を決めることにより、反射・屈折を基
本に液晶表示パネル側に非常に多くの光を導光でき、よ
り明るく輝度の均一な面照明が実現できる。
The micro prism 2 on the light emission observation surface side
b indicates that the angle α of the peak angle of the mountain is 16 as shown in FIG.
About 5 °, peak height about 7μm, pitch 300
It has a scalene triangular shape of about μm. Prism height≪prism pitch, the prism shape is determined so that the relationship between the angle α1 on the LED side and the angle α2 on the opposite side is α1> α2. More light can be guided, and a brighter, more uniform surface illumination can be realized.

【0017】LED3は従来例で述べたようにGaN系
化合物半導体を利用したもので、導光板2の中に一体に
組み込まれリード3a,3bを外に突き出している。こ
のLED3の導光板2への組み込みは、導光板2を成形
する際に一緒にLED3を成形するか、あるいは導光板
2の側面に凹部を形成しておき、エポキシ等の樹脂を介
してこの凹部にLED3を埋設させても良い。
The LED 3 uses a GaN-based compound semiconductor as described in the conventional example, and is integrally incorporated in the light guide plate 2 to protrude the leads 3a and 3b. The LED 3 is incorporated into the light guide plate 2 by molding the LED 3 together with the light guide plate 2 or by forming a concave portion on the side surface of the light guide plate 2 and forming the concave portion through a resin such as epoxy. LED3 may be buried.

【0018】波長変換層4は導光板2の発光観測面側か
ら形成した凹部2cに充填された蛍光物質を含む樹脂に
よって形成されたものである。蛍光物質を含む樹脂は、
今回エポキシ樹脂に蛍光物質を混入したものを採用し
た。また、この青色発光を白色発光に変換する蛍光物質
の場合は、照明装置1の発光色である青色と補色の関係
を持つものであればよく、蛍光染料,蛍光顔料,蛍光体
などが利用でき、たとえば(Y,Gd)3(Al,G
a)512:Ce等が好適である。
The wavelength conversion layer 4 is formed of a resin containing a fluorescent substance filled in a concave portion 2c formed from the light emission observation surface side of the light guide plate 2. The resin containing the fluorescent substance
This time, we used epoxy resin mixed with fluorescent material. Further, in the case of a fluorescent substance that converts this blue light emission into white light emission, any fluorescent substance that has a complementary color relationship with the blue color emitted by the lighting device 1 may be used, and fluorescent dyes, fluorescent pigments, phosphors, and the like can be used. For example, (Y, Gd) 3 (Al, G
a) 5 O 12 : Ce or the like is preferred.

【0019】以上の構成において、光の進路について図
2を基に説明する。LED3を通電すると青色発光し、
発光した光は直接波長変換層4に入射するか、またはマ
イクロプリズム2aで屈折・反射して波長変換層4に入
射する。そして、波長変換層4ではこれに含まれた蛍光
物質によって青色発光が白色に変換され導光板2内を図
2において上向きに進む。このとき、波長変換層4は青
色発光を白色に変換するだけでなく、蛍光物質によりマ
イクロプリズム2aからの屈折・反射光を拡散させる。
これにより、波長変換層4を抜けた光は縦筋模様の輝線
を発生することなく導光板2に均一な光として効率良く
入射し、さらに発光観測面側のマイクロプリズム2bに
よって屈折・反射されて液晶表示パネル21側に進む。
In the above configuration, the light path will be described with reference to FIG. When LED3 is energized, it emits blue light,
The emitted light is directly incident on the wavelength conversion layer 4, or is incident on the wavelength conversion layer 4 after being refracted and reflected by the microprism 2a. Then, in the wavelength conversion layer 4, the blue light emission is converted to white by the fluorescent substance contained therein, and travels upward in the light guide plate 2 in FIG. 2. At this time, the wavelength conversion layer 4 not only converts the blue light emission to white light, but also diffuses the refracted / reflected light from the microprism 2a with the fluorescent substance.
As a result, the light that has passed through the wavelength conversion layer 4 efficiently enters the light guide plate 2 as uniform light without generating a bright line with a vertical stripe pattern, and is further refracted and reflected by the microprism 2b on the light emission observation surface side. The process proceeds to the liquid crystal display panel 21 side.

【0020】このように、波長変換層4を設けることに
よって、白色の発光が液晶表示パネル21に照射され、
反射板22からの反射光によって液晶表示パネル21の
画像を照明して画像表示することができる。そして、高
輝度の青色発光のLED3を波長変換した白色発光によ
る照明なので、液晶表示パネル21の画像を鮮明に表示
できる。また、LED3を通電する際発熱するが、この
LED3と波長変換層4は直に接触していないので、波
長変換層4の樹脂の変色の発生がなく、従来の青色光を
白色光に変換する一般的な蛍光体樹脂塗布方式に比べる
と、電流が多く流せるため高輝度の白色発光による照明
が得られ、しかも画像品質の信頼性が向上する。更に、
LED3及び波長変換層4を導光板2に一体に組み込ん
でいるため、光の利用効率が優れたものとなる。
By providing the wavelength conversion layer 4 as described above, white light is emitted to the liquid crystal display panel 21,
The image on the liquid crystal display panel 21 can be illuminated with the light reflected from the reflection plate 22 and displayed. Further, since the illumination is performed by white light emission obtained by converting the wavelength of the high-intensity blue light-emitting LED 3, the image on the liquid crystal display panel 21 can be clearly displayed. In addition, although the LED 3 generates heat when energized, the LED 3 and the wavelength conversion layer 4 are not in direct contact with each other, so that the resin of the wavelength conversion layer 4 does not discolor and the conventional blue light is converted to white light. Compared with a general phosphor resin coating method, a larger amount of current can flow, so that illumination with high luminance white light emission can be obtained, and the reliability of image quality is improved. Furthermore,
Since the LED 3 and the wavelength conversion layer 4 are integrated into the light guide plate 2, the light use efficiency is excellent.

【0021】図3の例ではLED3を組み込む側と反対
側の端面を下端側が先細りするように傾斜させた反射面
2dとし、しかもその反射面に2aと同様のマイクロプ
リズムを形成したもので、導光板2の下端面及び発光観
測面のそれぞれには図1及び図2に示したものと同様の
マイクロプリズム2a,2bが形成されている。例え
ば、反射面2dはLED3の光軸(図において水平方
向)に対してψ=45°の傾斜を持たせ、しかも2aと
同様のマイクロプリズムを形成することにより、LED
3を組み込む側の反対側の端面から抜ける光をその傾斜
及びマイクロプリズムにより反射・屈折させ再利用する
ことができる。更に、マイクロプリズム2aに到達する
光の量を増やすために、マイクロプリズム2aを形成す
る端面に傾斜(例えば、θ=15°程度)をつけること
がより好ましい。
In the example shown in FIG. 3, the end face opposite to the side where the LED 3 is incorporated is formed as a reflecting surface 2d which is inclined so that the lower end is tapered, and a microprism similar to 2a is formed on the reflecting surface. Micro prisms 2a and 2b similar to those shown in FIGS. 1 and 2 are formed on the lower end surface of the light plate 2 and the light emission observation surface, respectively. For example, the reflection surface 2d has an inclination of ψ = 45 ° with respect to the optical axis (horizontal direction in the figure) of the LED 3 and forms a micro prism similar to that of the LED 2a.
The light exiting from the end face on the side opposite to the side into which 3 is incorporated can be reflected and refracted by the inclination and the microprism and reused. Further, in order to increase the amount of light reaching the microprism 2a, it is more preferable that the end face on which the microprism 2a is formed is inclined (for example, about θ = 15 °).

【0022】したがって、図2に示した長方形の正面形
状を持つ導光板2に比べると波長変換層4側へ向かわせ
る光量を増やし、導光板内を効率良く導光させることが
でき、導光板2の発光輝度を上げることができる。ま
た、2a,2bのマイクロプリズム、反射面2d上のマ
イクロプリズムのピッチ及び形状については第1の実施
形態の数値関係にとらわれず、傾斜角度に合わせて良好
な液晶表示が得られる数値関係にすることが好ましい。
Therefore, as compared with the light guide plate 2 having a rectangular front shape shown in FIG. 2, the amount of light directed toward the wavelength conversion layer 4 can be increased, and light can be efficiently guided inside the light guide plate. Light emission luminance can be increased. In addition, the pitch and shape of the microprisms 2a and 2b and the microprisms on the reflection surface 2d are not limited to the numerical relationship of the first embodiment, but are set to a numerical relationship in which a good liquid crystal display can be obtained according to the inclination angle. Is preferred.

【0023】なお、以上の実施の形態では、液晶表示パ
ネルに照射するフロントライトとして設営したが、本発
明のフロントライト型照明装置は絵画やポスターなどの
表示にも薄型照明装置として利用できる。また、導光板
2をポリカーボネート樹脂とすれば高温雰囲気での信頼
性を高めることができ、導光板2をエポキシ樹脂によっ
て成形すると生産性に優れた高効率の照明装置が得られ
る。
In the above embodiment, the front light is provided as a front light for irradiating the liquid crystal display panel. However, the front light type lighting device of the present invention can be used as a thin lighting device for displaying pictures, posters, and the like. In addition, if the light guide plate 2 is made of a polycarbonate resin, the reliability in a high-temperature atmosphere can be improved, and if the light guide plate 2 is molded with an epoxy resin, a highly efficient lighting device with excellent productivity can be obtained.

【0024】[0024]

【発明の効果】本発明では、導光板の中に青色発光のL
EDとこのLEDからの光を白色に変換して液晶表示パ
ネルに照射させるための波長変換層とを一体に備えてい
るので、小型・コンパクト化が可能となり、波長変換層
を光の拡散にも利用できるので導光板を一様に発光させ
ることで均一な面照明ができ、フロントライト用光源と
して最適に利用できる。
According to the present invention, blue light-emitting L is contained in the light guide plate.
Since the ED and the wavelength conversion layer for converting the light from this LED to white and irradiating it to the liquid crystal display panel are integrally provided, the size and size can be reduced, and the wavelength conversion layer can also be used for light diffusion. Since it can be used, uniform surface illumination can be achieved by uniformly emitting light from the light guide plate, and it can be optimally used as a light source for a front light.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明のフロントライト型照明装置を液晶表示
パネル及び反射板とともに示す切欠側面図
FIG. 1 is a cutaway side view showing a front light type illumination device of the present invention together with a liquid crystal display panel and a reflector.

【図2】導光板をその発光観測面側から観た正面図FIG. 2 is a front view of the light guide plate viewed from its light emission observation surface side.

【図3】一端面側に反射面を形成した例を示す導光板の
正面図
FIG. 3 is a front view of a light guide plate showing an example in which a reflection surface is formed on one end surface side;

【符号の説明】[Explanation of symbols]

1 照明装置 2 導光板 2a,2b マイクロプリズム 2c 凹部 2d 反射面 3 LED 3a,3b リード 4 波長変換層 21 液晶表示パネル 22 反射板 DESCRIPTION OF SYMBOLS 1 Illumination device 2 Light guide plate 2a, 2b Microprism 2c Depression 2d Reflection surface 3 LED 3a, 3b Lead 4 Wavelength conversion layer 21 Liquid crystal display panel 22 Reflection plate

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 液晶表示パネルの表示面側に対峙して配
置され且つ発光観測面側にマイクロプリズムを形成した
導光板を含むフロントライト型の照明装置であって、前
記導光板を前記液晶表示パネルの外郭よりも外に突き出
した形状としてその突き出し端面にマイクロプリズムを
形成し、前記液晶表示パネルから外れた位置であって前
記導光板の一端側に青色発光のLEDを一体に組み込
み、前記LEDと前記液晶表示パネルの表示面に対峙す
る領域との間に蛍光物質を含み青色発光を白色発光に波
長変換する波長変換層を備えていることを特徴とするフ
ロントライト型照明装置。
1. A front light type illuminating device including a light guide plate disposed opposite a display surface side of a liquid crystal display panel and having a microprism formed on a light emission observation surface side, wherein the light guide plate is provided with the liquid crystal display. A microprism is formed on the protruding end face as a shape protruding outside of the outer contour of the panel, and a blue light emitting LED is integrally incorporated at one end of the light guide plate at a position off the liquid crystal display panel, A front light type lighting device comprising a wavelength conversion layer containing a fluorescent substance and converting blue light emission to white light emission between a region facing the display surface of the liquid crystal display panel and a region facing the display surface of the liquid crystal display panel.
【請求項2】 前記導光板の突き出し端側の外郭で、前
記LEDと対峙する領域を反射させる反射面形状とする
とともにこの前記反射面にマイクロプリズムを有してい
ることを特徴とする請求項1記載のフロントライト型照
明装置。
2. The light guide plate according to claim 1, wherein the light guide plate has a reflective surface shape for reflecting a region facing the LED and has a microprism on the reflective surface. 2. The front light type lighting device according to 1.
JP2000110300A 2000-04-12 2000-04-12 Front light type illumination device Pending JP2001297617A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000110300A JP2001297617A (en) 2000-04-12 2000-04-12 Front light type illumination device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000110300A JP2001297617A (en) 2000-04-12 2000-04-12 Front light type illumination device

Publications (1)

Publication Number Publication Date
JP2001297617A true JP2001297617A (en) 2001-10-26

Family

ID=18622837

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000110300A Pending JP2001297617A (en) 2000-04-12 2000-04-12 Front light type illumination device

Country Status (1)

Country Link
JP (1) JP2001297617A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007087726A (en) * 2005-09-21 2007-04-05 New Industry Research Organization Light guide body
JP2007149665A (en) * 2005-10-17 2007-06-14 Philips Lumileds Lightng Co Llc Lighting system using fluorescent material distant from light source
US7465961B2 (en) 2003-03-25 2008-12-16 Sharp Kabushiki Kaisha Electronic equipment, backlight structure and keypad for electronic equipment
CN100464233C (en) * 2006-01-17 2009-02-25 群康科技(深圳)有限公司 Backlight module
JP2012220956A (en) * 2011-04-05 2012-11-12 Lg Innotek Co Ltd Display device
KR101814803B1 (en) * 2011-04-05 2018-01-04 엘지이노텍 주식회사 Display device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7465961B2 (en) 2003-03-25 2008-12-16 Sharp Kabushiki Kaisha Electronic equipment, backlight structure and keypad for electronic equipment
JP2007087726A (en) * 2005-09-21 2007-04-05 New Industry Research Organization Light guide body
JP4602884B2 (en) * 2005-09-21 2010-12-22 財団法人新産業創造研究機構 Light guide
JP2007149665A (en) * 2005-10-17 2007-06-14 Philips Lumileds Lightng Co Llc Lighting system using fluorescent material distant from light source
CN100464233C (en) * 2006-01-17 2009-02-25 群康科技(深圳)有限公司 Backlight module
JP2012220956A (en) * 2011-04-05 2012-11-12 Lg Innotek Co Ltd Display device
US8783930B2 (en) 2011-04-05 2014-07-22 Lg Innotek Co., Ltd. Display device
US9075173B2 (en) 2011-04-05 2015-07-07 Lg Innotek Co., Ltd. Display device
KR101814803B1 (en) * 2011-04-05 2018-01-04 엘지이노텍 주식회사 Display device
USRE47584E1 (en) 2011-04-05 2019-08-27 Lg Innotek Co., Ltd. Display device

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