JP4592409B2 - Light guide plate type display device - Google Patents

Light guide plate type display device Download PDF

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JP4592409B2
JP4592409B2 JP2004362266A JP2004362266A JP4592409B2 JP 4592409 B2 JP4592409 B2 JP 4592409B2 JP 2004362266 A JP2004362266 A JP 2004362266A JP 2004362266 A JP2004362266 A JP 2004362266A JP 4592409 B2 JP4592409 B2 JP 4592409B2
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light source
guide plate
light
light guide
vertical
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JP2006172843A (en
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竜也 赤木
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Sekisui Jushi Corp
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本発明は、導光板を用いて夜間においても良好に視認できる導光板式表示装置、サイン、及び道路標識に関するものである。   The present invention relates to a light guide plate type display device, a sign, and a road sign that can be favorably visually recognized at night using a light guide plate.

光源から発せられる光を導光板の端面から導光板内に導入し、導光板のいずれか一方の面に設けられた反射面により導入された光を前面側に放出させることで夜間においても良好に表示部を視認できる導光板式の表示装置はよく用いられてきている。その光源としては、冷陰極管、蛍光管がよく用いられてきているが、近年光源としての寿命が長い発光ダイオード(LEDとも言う)が用いられるものが増えてきている。   The light emitted from the light source is introduced into the light guide plate from the end face of the light guide plate, and the light introduced by the reflective surface provided on one side of the light guide plate is emitted to the front side, so that it is good even at night 2. Description of the Related Art A light guide plate type display device that can visually recognize a display unit has been often used. As the light source, a cold cathode tube and a fluorescent tube are often used, but in recent years, a light emitting diode (also referred to as an LED) having a long life as a light source is increasing.

冷陰極管、蛍光管といった管状の光源は、両端付近を除いてほぼ均一な発光輝度が得られるものであるが、LEDは単体が照射できる発光面積が小さく、複数のLEDを一列に配置して導光板内に光を入射させると光源間で輝度むらが生じる恐れがある。かかる懸念を解決すべく、例えば複数の点光源と、複数の点光源が対向配置され点光源からの光が入射される入射面と入射面から入射した光を出射する出射面とを有する導光板と、点光源からの光を入射面に入射させるための反射部材とを備え、反射部材の一端は、出射面上に、入射面近傍で点光源と点光源の間に対応する複数の部分で接着されている面光源装置が開示されている。   Tubular light sources such as cold-cathode tubes and fluorescent tubes can obtain almost uniform emission brightness except for the vicinity of both ends, but LEDs have a small light-emitting area that can be irradiated by a single unit, and a plurality of LEDs are arranged in a row. When light is incident on the light guide plate, there is a risk of uneven brightness between the light sources. In order to solve such a concern, for example, a light guide plate having a plurality of point light sources, an incident surface on which the plurality of point light sources are arranged to face each other, and an exit surface that emits light incident from the incident surface. And a reflecting member for causing the light from the point light source to enter the incident surface, and one end of the reflecting member is formed on the exit surface at a plurality of portions corresponding to between the point light source and the point light source in the vicinity of the incident surface. A bonded surface light source device is disclosed.

特開2001−43721号公報JP 2001-43721 A

しかしながら、LEDは本質的に冷陰極管や蛍光管と較べ光線の指向角が小さいために、上述の如く対策を施しても光源直近の導光板からの発光輝度が低下するのを完全に防ぐことができない。また導光板が大型のものとなった場合には多数のLEDを配置する必要があり、コストが嵩むと共に、導光板全体の輝度を均一とするには導光板の反射面の光反射に係わる設計が煩瑣なものとなる。   However, since LEDs are essentially smaller in the directivity of light rays than cold cathode fluorescent tubes and fluorescent tubes, it is possible to completely prevent the light emission luminance from the light guide plate closest to the light source from being lowered even if measures are taken as described above. I can't. In addition, when the light guide plate becomes large, it is necessary to arrange a large number of LEDs. This increases the cost, and the design related to the light reflection of the reflection surface of the light guide plate in order to make the brightness of the entire light guide plate uniform. Becomes annoying.

本発明は上記の如き課題に鑑みてなされたものであり、光源にLEDを用いた場合でも光源直近の発光輝度を十分に得ることができ、且つ導光板が大型のものとなっても低廉なコストで簡便に導光板全体の輝度を均一とできる導光板式表示装置、サイン及び道路標識を提供せんとするものである。   The present invention has been made in view of the problems as described above, and even when an LED is used as a light source, it is possible to sufficiently obtain the light emission brightness closest to the light source, and it is inexpensive even if the light guide plate is large. It is intended to provide a light guide plate type display device, a sign and a road sign that can make the brightness of the entire light guide plate uniform at a low cost.

上記目的を達成するため、本発明は以下のような構成としている。すなわち、本発明に係わる導光板式表示装置は、平面矩形の導光板を備え、該導光板の縦方向の端面と横方向の端面とに各々縦置き光源と横置き光源とが、発せられる光を導光板内に入射可能に配置されたものであって、前記導光板の周囲に枠体が形成され、該枠体内に前記縦置き光源及び横置き光源が収納され、前記縦置き光源は上下方向に間隔をおいて設けられた複数のLEDとなされ、前記横置き光源は冷陰極管及び/又は蛍光管となされ、かつ該横置き光源の光の導入方向の反対側には反射体が設けられ、前記縦置き光源と横置き光源の二方向から光が前記導光板に導入されると共に、LEDとなされた縦置き光源により生じる照明むらが横置き光源により軽減されるようになされたことを特徴とするものである。 In order to achieve the above object, the present invention is configured as follows. That is, the light guide plate type display device according to the present invention includes a planar rectangular light guide plate, and light emitted from a vertically placed light source and a horizontally placed light source respectively on a longitudinal end surface and a lateral end surface of the light guide plate. Is arranged so as to be incident on the light guide plate, and a frame is formed around the light guide plate, the vertical light source and the horizontal light source are accommodated in the frame, and the vertical light source is The horizontal light source is a cold cathode tube and / or a fluorescent tube, and a reflector is provided on the side opposite to the light introduction direction of the horizontal light source. The light is introduced into the light guide plate from the two directions of the vertical light source and the horizontal light source, and the illumination unevenness caused by the vertical light source formed as an LED is reduced by the horizontal light source. It is a feature.

本発明に係わる導光板式表示装置によれば、縦置き光源及び横置き光源のいずれか一方が冷陰極管及び/又は蛍光管となされていることで、他方の光源のLED直近が冷陰極管及び/又は蛍光管によって光量が補われ、光源としてLEDを用いた場合でも光源直近の発光輝度を十分に得ることができ、更にLEDの間隔をそれ程小さくしなくとも、複数のLEDの間に生じる照明むらを冷陰極管及び/又は蛍光管から発せられる均一な輝度の光によって補填して、導光板が大型のものとなっても低廉なコストで簡便に導光板全体の輝度を均一とすることができる。   According to the light guide plate type display device according to the present invention, either one of the vertical light source and the horizontal light source is a cold cathode tube and / or a fluorescent tube, and the LED of the other light source is in the cold cathode tube. And / or the amount of light is supplemented by a fluorescent tube, and even when an LED is used as a light source, it is possible to sufficiently obtain the light emission brightness in the immediate vicinity of the light source. Compensate illumination unevenness with light of uniform brightness emitted from cold cathode fluorescent lamps and / or fluorescent tubes, and evenly make the brightness of the entire light guide plate uniform even at a low cost even if the light guide plate is large. Can do.

また前記冷陰極管及び/又は蛍光管は、前記導光板の横方向の端面に配置されていれば、重力による冷陰極管及び/又は蛍光管に封入されたガスの偏りや発光による残滓の堆積により放電が妨げられる度合いを小さくでき好ましい。   Further, if the cold cathode tube and / or the fluorescent tube are arranged on the end face in the lateral direction of the light guide plate, the accumulation of the residue due to the bias of the gas enclosed in the cold cathode tube and / or the fluorescent tube due to gravity and light emission. Therefore, the degree of hindering discharge can be reduced, which is preferable.

たサインに、本発明請求項1に記載の導光板式表示装置を備えることができる To Also sign can Rukoto includes a light guide plate type display device according to claim 1 of the present invention.

かかるサインによれば、導光板を用いた内照式のサインは薄型で設置の自由度が高められることから種々用いられてきているが、難点として、とりわけ大型のものとなると照明むらの発生やコスト高が難点として挙げられているが、本発明に係わる導光板式表示装置を用いることでかかる難点を軽減して容易に設置することが可能となり得る。 According to such a sign, an internally-illuminated sign using a light guide plate has been used in various ways because it is thin and increases the degree of freedom of installation. Although high cost is cited as a difficulty, it may be possible to easily install the light guide plate type display device according to the present invention by reducing the difficulty.

た道路標識、本発明請求項1に記載の導光板式表示装置を備えることができる To or road signs can Rukoto includes a light guide plate type display device according to claim 1 of the present invention.

かかる道路標識によれば、導光板を用いた内照式の道路標識は薄型で設置の自由度が高められることから種々用いられてきているが、難点として、とりわけ大型のものとなると照明むらの発生やコスト高が難点として挙げられているが、本発明に係わる導光板式表示装置を用いることでかかる難点を軽減して容易に設置することが可能となり得る。 According to such a road sign, an internally illuminated road sign using a light guide plate has been used in various ways because it is thin and increases the degree of freedom of installation. Although generation and high cost are cited as difficulties, it may be possible to reduce the difficulty by using the light guide plate type display device according to the present invention and to easily install it.

本発明に係わる導光板式表示装置によれば、縦置き光源及び横置き光源のいずれか一方が冷陰極管及び/又は蛍光管となされていることで、他方の光源のLED直近が冷陰極管及び/又は蛍光管によって光量が補われ、光源としてLEDを用いた場合でも光源直近の発光輝度を十分に得ることができ、更にLEDの間隔をそれ程小さくしなくとも、複数のLEDの間に生じる照明むらを冷陰極管及び/又は蛍光管から発せられる均一な輝度の光によって補填して、導光板が大型のものとなっても低廉なコストで簡便に導光板全体の輝度を均一とすることができる。   According to the light guide plate type display device according to the present invention, either one of the vertical light source and the horizontal light source is a cold cathode tube and / or a fluorescent tube, and the LED of the other light source is in the cold cathode tube. And / or the amount of light is supplemented by a fluorescent tube, and even when an LED is used as a light source, it is possible to sufficiently obtain the light emission brightness in the immediate vicinity of the light source. Compensate illumination unevenness with light of uniform brightness emitted from cold cathode fluorescent lamps and / or fluorescent tubes, and evenly make the brightness of the entire light guide plate uniform even at a low cost even if the light guide plate is large. Can do.

本発明に係わる最良の実施の形態について、図面に基づき以下に具体的に説明する。   BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment according to the present invention will be specifically described below with reference to the drawings.

図1は、本発明に係わる導光板式表示装置の、実施の一形態を示す正面図である。導光板式表示装置10は、矩形の導光板1の周囲に枠体4が形成され、枠体4内に縦置き光源2及び横置き光源3が収納されている。本図においては表示部を省略し、枠体4の正面側を一部破面図として正面側から縦置き光源2及び横置き光源3を視認可能として描画している。導光板式表示装置10の設置時には方向αが上方となるが、導光板1の縦方向の端面11に正対して基板21に取り付けられたLEDである縦置き光源2が上下方向に間隔をおいて一列に設けられ、縦置き光源2から縦方向の端面11に対して方向βに光が入射されるようになされている。更に導光板1の横方向の端面12に正対して冷陰極管である横置き光源3が設けられ、横置き光源3から横方向の端面12に対して方向βと直交する方向γに光が入射されるようになされ、横置き光源3の方向γと反対側には反射体31が設けられている。   FIG. 1 is a front view showing an embodiment of a light guide plate type display device according to the present invention. In the light guide plate type display device 10, a frame body 4 is formed around a rectangular light guide plate 1, and a vertical light source 2 and a horizontal light source 3 are accommodated in the frame body 4. In this figure, the display unit is omitted, and the front side of the frame body 4 is partially broken, and the vertical light source 2 and the horizontal light source 3 are drawn so as to be visible from the front side. When the light guide plate type display device 10 is installed, the direction α is upward, but the vertical light source 2 that is an LED attached to the substrate 21 facing the vertical end surface 11 of the light guide plate 1 is spaced vertically. The light is incident in the direction β from the vertical light source 2 to the vertical end face 11. Further, a horizontal light source 3 that is a cold cathode tube is provided directly opposite the lateral end surface 12 of the light guide plate 1, and light is emitted from the lateral light source 3 in a direction γ perpendicular to the direction β with respect to the lateral end surface 12. A reflector 31 is provided on the side opposite to the direction γ of the lateral light source 3.

縦置き光源2は光の指向角が小さいLEDであることから、縦置き光源2のみでは縦方向の端面11付近の発光輝度の不足や方向βに沿って照明むらが発生する恐れがあるが、方向βと直交する方向γに横置き光源3により均一な光を導光板1内に導入することで、二方向から光が導光板1内に導入されて導光板1全体としての発光輝度が向上し視認性が高められると共に、縦置き光源2により生じる横方向の光むらが横置き光源3の均一な縦方向の光によりかき消されて、縦置き光源2のみが設けられた場合と較べ格段に照明むらを軽減することができ、LEDと冷陰極管とを光源として用いることの各々の利点を最大限に活用することができる。   Since the vertical light source 2 is an LED having a small light directivity angle, the vertical light source 2 alone may cause a shortage of light emission luminance in the vicinity of the end surface 11 in the vertical direction and uneven illumination along the direction β. By introducing uniform light into the light guide plate 1 by the horizontal light source 3 in the direction γ orthogonal to the direction β, light is introduced into the light guide plate 1 from two directions, and the light emission luminance of the entire light guide plate 1 is improved. In addition to improving visibility, the horizontal light unevenness caused by the vertical light source 2 is drastically erased by the uniform vertical light of the horizontal light source 3, which is much higher than when only the vertical light source 2 is provided. Irradiation unevenness can be reduced, and the respective advantages of using the LED and the cold cathode tube as the light source can be fully utilized.

更にまた、縦置き光源2には重力による悪影響を受けないLEDを用い、重力による悪影響を受けやすい冷陰極管を横置き光源3としていることで、二方向から導光板1内に光を入射するにおいても冷陰極管に封入されたガスは距離の小さい断面方向に偏るのみで偏りによる悪影響は小さくなり、また発光により発生する残滓も断面方向の下方に堆積するので、残滓が電極間の放電の妨げとならず光源としての寿命を延長することができる。   Further, the vertically placed light source 2 uses an LED that is not adversely affected by gravity, and a cold cathode tube that is easily affected by gravity is used as the horizontally placed light source 3 so that light enters the light guide plate 1 from two directions. In this case, the gas sealed in the cold cathode tube is only biased in the cross-sectional direction with a small distance, and the adverse effect due to the bias is reduced, and the residue generated by the light emission is also deposited below the cross-sectional direction. The life as a light source can be extended without hindering.

また、とりわけ導光板1が、例えば短片方向が2m以上あるような大型のものである場合などには、縦置き光源2及び横置き光源3を、導光板1を挟んで反対側の縦方向の端面11及び横方向の端面12にも設けて四方向から導光板1内に光を導入することで導光板1全体に光が行き渡りやすくするようにしてもよい。   In particular, when the light guide plate 1 is a large one having, for example, a short piece direction of 2 m or more, the vertical light source 2 and the horizontal light source 3 are placed in the opposite vertical direction across the light guide plate 1. The light guide plate 1 may be provided on the end face 11 and the end face 12 in the lateral direction to introduce light into the light guide plate 1 from four directions so that the light can easily reach the entire light guide plate 1.

更にまた、上述の如き導光板式表示装置10を用いて内照式のサインを形成すれば、大型のサインであっても低廉なコストで照明むらが少ないサインを得ることができる。更に道路標識に適用すれば、道路標識は導光板式表示装置としては大型のものが求められるが、本発明に係わる導光板式表示装置10を用いることで容易に導光板式としての利点を生かした内照式の道路標識を得ることができる。   Furthermore, if an internally illuminated sign is formed using the light guide plate type display device 10 as described above, a sign with little illumination unevenness can be obtained even at a large cost. Further, when applied to road signs, the road signs are required to have a large size as the light guide plate type display device. However, by using the light guide plate type display device 10 according to the present invention, the advantages of the light guide plate type can be easily utilized. It is possible to obtain an internally illuminated road sign.

本発明に係わる導光板式表示装置の、実施の一形態を示す一部波面の正面図である。It is a front view of the partial wave front which shows one Embodiment of the light-guide plate type display apparatus concerning this invention.

符号の説明Explanation of symbols

1 導光板
11 縦方向の端面
12 横方向の端面
2 縦置き光源
3 横置き光源
10 導光板式表示装置
DESCRIPTION OF SYMBOLS 1 Light-guide plate 11 End surface of a vertical direction 12 End surface of a horizontal direction 2 Vertical light source 3 Horizontal light source 10 Light guide plate type display apparatus

Claims (1)

平面矩形の導光板を備え、該導光板の縦方向の端面と横方向の端面とに各々縦置き光源と横置き光源とが、発せられる光を導光板内に入射可能に配置されたものであって、前記導光板の周囲に枠体が形成され、該枠体内に前記縦置き光源及び横置き光源が収納され、前記縦置き光源は上下方向に間隔をおいて設けられた複数のLEDとなされ、前記横置き光源は冷陰極管及び/又は蛍光管となされ、かつ該横置き光源の光の導入方向の反対側には反射体が設けられ、前記縦置き光源と横置き光源の二方向から光が前記導光板に導入されると共に、LEDとなされた縦置き光源により生じる照明むらが横置き光源により軽減されるようになされたことを特徴とする導光板式表示装置。 A light source plate having a rectangular plane is provided, and a vertical light source and a horizontal light source are respectively disposed on the vertical end surface and the horizontal end surface of the light guide plate so that the emitted light can enter the light guide plate. A frame is formed around the light guide plate, the vertical light source and the horizontal light source are accommodated in the frame, and the vertical light source includes a plurality of LEDs spaced in the vertical direction; The horizontal light source is a cold cathode tube and / or a fluorescent tube, and a reflector is provided on the opposite side of the light introduction direction of the horizontal light source, and the vertical light source and the horizontal light source are in two directions. The light guide plate display device is characterized in that light is introduced into the light guide plate and uneven illumination caused by the vertically placed light source that is an LED is reduced by the horizontally placed light source .
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JP5210667B2 (en) * 2008-03-06 2013-06-12 株式会社ジャパンディスプレイイースト Liquid crystal display
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