JP2005038768A - Surface light source and display device using this - Google Patents

Surface light source and display device using this Download PDF

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JP2005038768A
JP2005038768A JP2003275960A JP2003275960A JP2005038768A JP 2005038768 A JP2005038768 A JP 2005038768A JP 2003275960 A JP2003275960 A JP 2003275960A JP 2003275960 A JP2003275960 A JP 2003275960A JP 2005038768 A JP2005038768 A JP 2005038768A
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light source
guide plate
light
light guide
incident
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JP4143920B2 (en
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Hiroshi Mitsuda
博志 満田
Toshiyuki Yoneda
俊之 米田
Hiroshi Okawa
博司 大川
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Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
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Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that, in the conventional surface light source device, a substrate mounted with a plurality of LEDs is fitted to a holder so as to contact one side face of a light guide plate, but since a wiring space for supplying power to the substrate is necessary, a gap is generated between the LEDs and the light guide plate and the incidence efficiency of the light emitted from the LEDs to the light guide plate is degraded. <P>SOLUTION: This is the surface light source device equipped with a point light source, a light source substrate mounting the point light source, and a light guide plate in which one side face is made a light incident face and the light of a point light source entered from the incident face is made a surface light source and is irradiated to the front face. A wiring connection part for connecting the point light source to the power supply is provided at the end part of the mounting face of the light source substrate mounting the point light source, and a recessed part is formed at a position opposed to the wiring connection part on one side face of the light guide plate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、導光板を用いたエッジライト式の面光源装置及びこの面光源装置を用い、誘導灯、非常灯、道路標識、広告灯等に使用される表示装置に関するものである。   The present invention relates to an edge-light type surface light source device using a light guide plate and a display device using this surface light source device and used for guide lights, emergency lights, road signs, advertising lights, and the like.

従来、面光源装置およびこれを用いた表示装置には、次のようなものがある。
青色光を発する複数のＬＥＤを並べた光源と、一側面から入射した光源の光を面発光させる導光板と、光源の発光色を異なる色に変換する色変換部材と、背面からの照明により表示される図柄や文字等の表示パターンが形成された表示パネルとを組合せ、色変換部材により青色光を白色光あるいは緑、黄、赤色等他の光スペクトル成分をもつ光に変換することによって、表示パネルの表示に必要な白色光あるいは他の異なる色に変換され、表示パターンを表示する。
そして、複数のＬＥＤは基板に一定の間隔のピッチで実装され、この基板は、導光板の一側面に近接するようにホルダーに着脱可能に取り付けられており、ＬＥＤの側方に出射された光を導光板に反射させるための反射板が基板の両側に配設されている。また、ホルダーに内装されたＬＥＤを駆動するための電気回路を交流電源に接続する（例えば、特許文献１参照）。
特開平９−１７９５１２号公報（第３頁、第４頁、図１、図２） Conventional surface light source devices and display devices using the same are as follows.
Displayed by a light source in which a plurality of LEDs emitting blue light are arranged, a light guide plate that emits light from the light source incident from one side, a color conversion member that converts the light emission color of the light source into a different color, and illumination from the back Display by combining a display panel on which a display pattern such as symbols and characters is formed, and converting blue light into white light or light having other light spectrum components such as green, yellow, and red by a color conversion member. It is converted into white light or other different colors necessary for the display of the panel to display the display pattern.
The plurality of LEDs are mounted on the substrate at a constant pitch, and this substrate is detachably attached to the holder so as to be close to one side surface of the light guide plate, and light emitted to the side of the LED Reflecting plates for reflecting the light to the light guide plate are disposed on both sides of the substrate. In addition, an electric circuit for driving the LED incorporated in the holder is connected to an AC power source (see, for example, Patent Document 1).
JP-A-9-179512 (page 3, page 4, FIG. 1, FIG. 2)

従来の面光源装置では、複数のＬＥＤが実装された基板が導光板の一側面に近接するようにホルダーに取付けられるが、電源から基板に電力を供給するための配線スペースが必要であるため、自ずとＬＥＤと導光板間に間隔が生じ、ＬＥＤを出射した光の導光板への入射効率が低下するという問題があった。   In a conventional surface light source device, a substrate on which a plurality of LEDs are mounted is attached to a holder so as to be close to one side surface of the light guide plate, but a wiring space for supplying power from the power source to the substrate is required. As a result, there is a problem that an interval between the LED and the light guide plate is generated, and the incident efficiency of the light emitted from the LED to the light guide plate is lowered.

本発明は、上記のような問題を解消するためになされたもので、点状光源からの光を効率良く導光板に入射させ、明るく、高い表示品質を有する面光源装置を得ることを目的とする。
また、この面光源装置を使用して、明るく、高い表示品質を有する表示装置を得ることを目的とする。 The present invention has been made to solve the above-described problems, and has an object to obtain a bright surface light source device having high display quality by efficiently making light from a point light source incident on a light guide plate. To do.
Another object of the present invention is to obtain a bright and high-quality display device using this surface light source device.

本発明の面光源装置は、点状光源と、該点状光源を実装する光源基板と、一側面を入射面とし、該入射面から入射した点状光源の光を面光源とし、前面の出射面から照射する導光板とを備えた面光源装置であって、点状光源を実装する光源基板の実装面の端部に、点状光源を電源と接続させる配線接続部を設け、また、導光板の側面で、配線接続部に対向する位置に凹部を形成したものである。   The surface light source device of the present invention has a point light source, a light source substrate on which the point light source is mounted, one side as an incident surface, the point light source incident from the incident surface as a surface light source, and emission from the front surface. A surface light source device including a light guide plate that irradiates from a surface, and a wiring connection portion that connects the point light source to a power source is provided at an end of the mounting surface of the light source substrate on which the point light source is mounted. A concave portion is formed on the side surface of the optical plate at a position facing the wiring connection portion.

本発明の面光源装置は、点状光源からの光を効率良く導光板に入射させ、明るく、高い表示品質を有する面光源装置を得ることができる。また、面光源装置の有効出射面の割合の減少を防ぐことが可能となる。   According to the surface light source device of the present invention, the light from the point light source can be efficiently incident on the light guide plate to obtain a surface light source device that is bright and has high display quality. In addition, it is possible to prevent a reduction in the ratio of the effective emission surface of the surface light source device.

図１は、表示装置の分解斜視図であり、図２は、図１の表示装置の要部平面図であり、図３は、図１の表示装置の部分断面図である。
図１に示すように、表示装置の主要構成は、点状光源２０からの出射光を導光板４０の一側面の入射面４３で受け、前面の出射面４１から面光源として出射する面光源装置と、面光源装置の導光板４０の前面に配置され、導光板４０からの出射光により表示パターンを表示する表示板８０とである。
以下表示装置の構成を詳細に説明する。
点状光源２０は、発光ダイオード、レーザダイオード等を光源基板３０の長手方向に沿って一列又は複数列に配列し、実装される。ここで、光源基板３０としては、紙フェノール、ガラスエポキシ等の樹脂基板やアルミニウム等の金属基板を使用する。
光源基板３０には点状光源２０に電力を供給するための回路パターンが設けられており、また、光源基板３０の点状光源２０の実装面の端部（例えば、図１では、光源基板３０の長手方向の端部）には、図示しない電源から電力を供給する配線接続部３１を設けている。配線接続部３１からは図示しない電源への配線３５が施されている。なお、配線接続部３１は、半田やコネクタ等で光源基板３０と配線３５を接続している。 1 is an exploded perspective view of the display device, FIG. 2 is a plan view of a main part of the display device of FIG. 1, and FIG. 3 is a partial cross-sectional view of the display device of FIG.
As shown in FIG. 1, the main configuration of the display device is a surface light source device that receives emitted light from the point light source 20 on an incident surface 43 on one side surface of the light guide plate 40 and emits it as a surface light source from an output surface 41 on the front surface. And a display plate 80 that is disposed in front of the light guide plate 40 of the surface light source device and displays a display pattern by light emitted from the light guide plate 40.
Hereinafter, the configuration of the display device will be described in detail.
The point light source 20 is mounted by arranging light emitting diodes, laser diodes, and the like in one or more rows along the longitudinal direction of the light source substrate 30. Here, as the light source substrate 30, a resin substrate such as paper phenol or glass epoxy or a metal substrate such as aluminum is used.
The light source substrate 30 is provided with a circuit pattern for supplying power to the point light source 20, and the end of the mounting surface of the point light source 20 of the light source substrate 30 (for example, the light source substrate 30 in FIG. 1). The wiring connection part 31 which supplies electric power from the power supply which is not shown in figure is provided in the edge part of this longitudinal direction. A wiring 35 to a power source (not shown) is provided from the wiring connection portion 31. The wiring connection portion 31 connects the light source substrate 30 and the wiring 35 with solder, a connector, or the like.

導光板４０は、アクリルやポリカーボネート等の透明樹脂からなる板状体であり、その一側面に点状光源２０が対向するように光源基板３０が配設され、入射面４３が形成される。また、導光板４０は、前面の出射面４１又は背面の出射対向面４２のうち少なくともいずれか一方に、導光板４０中を伝播する光を拡散する光拡散機能を有している。この光拡散機能は白色ドット印刷を施すこと、粗面化すること、又はプリズムを設けること等により付与される。また、導光板４０は図２に示すように、入射面４３のうち、光源基板３０の配線接続部３１に対向する位置に凹部４５を設けている。凹部４５は、入射面４３と平行な切欠き面４７と、入射面４３から切欠き面４７に直線的に連続する連続面４６とを形成するように、導光板４０の前面から背面まで切欠き、形成される。   The light guide plate 40 is a plate-like body made of a transparent resin such as acrylic or polycarbonate, and the light source substrate 30 is disposed on one side surface of the light guide plate 40 so as to face the light source plate 30, thereby forming an incident surface 43. The light guide plate 40 has a light diffusion function for diffusing light propagating through the light guide plate 40 on at least one of the front emission surface 41 and the rear emission facing surface 42. This light diffusing function is given by printing with white dots, roughening, or providing a prism. Further, as shown in FIG. 2, the light guide plate 40 is provided with a concave portion 45 at a position facing the wiring connection portion 31 of the light source substrate 30 in the incident surface 43. The recess 45 is notched from the front surface to the back surface of the light guide plate 40 so as to form a notch surface 47 parallel to the incident surface 43 and a continuous surface 46 linearly continuous from the incident surface 43 to the notch surface 47. ,It is formed.

導光板４０の背面側には、アルミニウム又は銀等を蒸着した樹脂製シート又は白色の樹脂製シート等高反射率の材料からなる反射シート６０を設ける。
また、導光板４０の前面側には、プリズム列を有するプリズムシート又は拡散シート等の光学シート７０を設ける。これらはいずれかを設けても、両方を設けても、いずれも設けなくてもよく、用途等に応じて選択する。
導光板４０の前面側、又は導光板４０の前面の光学シート７０の前面側に表示板８０を設ける。表示板８０は、アクリル、ポリカーボネート等の透光性の樹脂板にスクリーン印刷又はカッテイングシート等により任意の図柄を設ける。 On the back side of the light guide plate 40, a reflection sheet 60 made of a highly reflective material such as a resin sheet deposited with aluminum or silver or a white resin sheet is provided.
Further, an optical sheet 70 such as a prism sheet having a prism row or a diffusion sheet is provided on the front side of the light guide plate 40. Either one of them, both of them, or neither of them may be provided, and they are selected according to the application.
A display plate 80 is provided on the front side of the light guide plate 40 or on the front side of the optical sheet 70 on the front side of the light guide plate 40. The display plate 80 is provided with an arbitrary pattern by screen printing or a cutting sheet on a light-transmitting resin plate such as acrylic or polycarbonate.

光源カバー５０は、樹脂や金属等からなり、背面（表示板８０側と反対側の面で、嵌合により表示板ケース１０の背面で塞がれる面）及び下面（表示板ケース１０に嵌合させる側の面）が開口した六面体状の箱体であり、内面は高反射率部材が付与されている。また、下面の開口部と対向する上面の内面に光源基板３０の背面が固定され、この開口部から点光源２０の光が出射される。
表示板ケース１０は、樹脂や金属板等からなり、前面（表示板８０側の面）と上面（導光板４０の入射面４３側の面）とが開口した六面体状の箱体の背面である底面（表示板８０側と反対側の面）を光源カバー５０側に延設したものである。
そこで、光源カバー５０は、下面の開口部を表示板ケース１０の上面の開口部に嵌合させ、表示板ケース１０と合体することにより、表示板ケース１０の上部の外壁となり、表示板ケース１０の一部を形成する。
このように、光源基板３０を取付けた光源カバー５０を表示板ケース１０の開口部との嵌合により取付けているので、光源カバー５０の取付け、取外しが容易であり、点状光源２０（又は光源基板３０）の交換が容易となる。
特に、光源カバー５０と表示板ケース１０との嵌合は、背面のない光源カバー５０と延設背面１０ａを持つ表示板ケース１０とで行われるため、光源カバー５０の背面の嵌め合せがなく、光源カバー５０と表示板ケース１０の着脱は、上面下面方向に限定されず、上面下面方向から前面背面方向まで広範囲に可能となり、極めて容易となる。即ち、着脱の自由度が増加する。そこで、点状光源２０（又は点状光源２０を実装した光源基板３０）の交換が極めて容易となる。 The light source cover 50 is made of resin, metal, or the like, and has a rear surface (a surface opposite to the display plate 80 side and a surface closed by the rear surface of the display plate case 10 by fitting) and a lower surface (fitted to the display plate case 10). A hexahedron-like box having an open surface), and a high reflectance member is provided on the inner surface. Further, the back surface of the light source substrate 30 is fixed to the inner surface of the upper surface facing the opening portion of the lower surface, and the light of the point light source 20 is emitted from this opening portion.
The display panel case 10 is made of a resin, a metal plate, or the like, and is a rear surface of a hexahedron-shaped box body whose front surface (surface on the display plate 80 side) and upper surface (surface on the incident surface 43 side of the light guide plate 40) are opened. The bottom surface (the surface opposite to the display panel 80 side) is extended to the light source cover 50 side.
Therefore, the light source cover 50 is fitted into the opening on the upper surface of the display plate case 10 with the opening on the lower surface, and united with the display plate case 10, thereby forming an outer wall on the upper portion of the display plate case 10. Form a part of
Thus, since the light source cover 50 to which the light source substrate 30 is attached is attached by fitting with the opening of the display panel case 10, the light source cover 50 can be easily attached and detached, and the point light source 20 (or the light source) Replacement of the substrate 30) is facilitated.
In particular, the fitting between the light source cover 50 and the display plate case 10 is performed by the light source cover 50 having no back surface and the display plate case 10 having the extended back surface 10a. The attachment and detachment of the light source cover 50 and the display panel case 10 is not limited to the upper surface lower surface direction, and can be performed in a wide range from the upper surface lower surface direction to the front surface rear surface direction, which is extremely easy. That is, the degree of freedom of attachment / detachment increases. Therefore, it is very easy to replace the point light source 20 (or the light source substrate 30 on which the point light source 20 is mounted).

表示板ケース１０には、底面側から前面側に向かって、反射シート６０、導光板４０、光学シート７０がこの順に収容され、表示板ケース１０の前面の開口部は上部を除いて、表示板８０で塞がれ、さらに、光源カバー５０が嵌合されることにより、上面の開口部及び前面の開口部の上部が塞がれる。この際、導光板４０の一側面である入射面４３に光源基板３０上の点状光源２０が丁度対向するようになる。   The display plate case 10 accommodates the reflection sheet 60, the light guide plate 40, and the optical sheet 70 in this order from the bottom surface side to the front surface side. 80, and the light source cover 50 is fitted to close the upper opening and the upper opening. At this time, the point light source 20 on the light source substrate 30 just faces the incident surface 43 which is one side surface of the light guide plate 40.

以上より、点状光源２０、点状光源２０を実装した光源基板３０、反射シート６０、導光板４０、光学シート７０、光源カバー５０表示板ケース１０及び点状光源２０の点灯制御装置（図示省略）等で面光源装置を構成する。また、面光源装置に表示板８０を加えて表示装置を構成する。   As described above, the point light source 20, the light source substrate 30 on which the point light source 20 is mounted, the reflection sheet 60, the light guide plate 40, the optical sheet 70, the light source cover 50, the display plate case 10, and the lighting control device for the point light source 20 (not shown). ) Etc. to constitute the surface light source device. Further, the display device is configured by adding the display plate 80 to the surface light source device.

次に、図３により本表示装置の動作を説明する。
制御装置により点状光源２０が点灯され、点状光源２０から発せられた光は、直接又は光源カバー５０を介して導光板４０の入射面４３から導光板４０に入射する。導光板４０に入射した光は、主として導光板４０中を入射対向面４４側へ伝播する。この伝播過程において、出射面４１又は出射対向面４２に設けられた光拡散機能により光が出射面４１から出射する。出射面４１から出射した光は、光学シート７０により配光を整えられたうえで表示板８０を照射し、表示板８０に描かれた情報を表示する。なお、出射対向面４２から出射した光は、反射シート６０により再度、導光板４０に戻された後、出射面４１から出射する。 Next, the operation of the display device will be described with reference to FIG.
The point light source 20 is turned on by the control device, and the light emitted from the point light source 20 enters the light guide plate 40 directly or via the light source cover 50 from the incident surface 43 of the light guide plate 40. The light incident on the light guide plate 40 mainly propagates in the light guide plate 40 toward the incident facing surface 44 side. In this propagation process, light is emitted from the emission surface 41 by the light diffusion function provided on the emission surface 41 or the emission facing surface 42. The light emitted from the emission surface 41 is irradiated with the display plate 80 after the light distribution is adjusted by the optical sheet 70, and information drawn on the display plate 80 is displayed. The light emitted from the emission facing surface 42 is returned again to the light guide plate 40 by the reflection sheet 60 and then emitted from the emission surface 41.

また、本表示装置においては、導光板４０は入射面４３のうち、光源基板３０の配線接続部３１に対向する位置に凹部４５を設けている。そのため、導光板４０と、配線接続部３１及び配線３５とは干渉することがない。又点状光源２０と導光板４０とを近接配置することができる。
点状光源２０と導光板４０との間隔をＸとすると、間隔Ｘに対する面光源装置の輝度の関係は、図４に示す関係となる。即ち、導光板４０に凹部４５を設けることにより、点状光源２０と導光板４０の間隔Ｘを減少できるため、高輝度な面光源装置及び表示装置を得ることができる。
また、配線接続部３５を、光源基板３０の背面等でなく、点状光源２０実装面側に設置し、導電板４０の対向面に凹部４５を形成したことにより、背面等に形成することによる配線接続部３５の設置スペースを設ける必要がなく、面光源装置の有効出射面の割合（全面に対して有効出射面の割合）の減少を防ぎ、また表示装置の有効表示面の割合（全面に対して有効表示面の割合）の減少を防ぐことが可能となる。なお、光源基板３０の端部に点状光源２０が実装されない部分が生じるが、下記の凹部４５の形成により、有効出射面の減少とはならない。 Further, in the present display device, the light guide plate 40 is provided with a recess 45 in the incident surface 43 at a position facing the wiring connection portion 31 of the light source substrate 30. Therefore, the light guide plate 40 does not interfere with the wiring connection portion 31 and the wiring 35. Further, the point light source 20 and the light guide plate 40 can be arranged close to each other.
When the interval between the point light source 20 and the light guide plate 40 is X, the relationship of the luminance of the surface light source device with respect to the interval X is as shown in FIG. That is, by providing the recess 45 in the light guide plate 40, the distance X between the point light source 20 and the light guide plate 40 can be reduced, so that a high-luminance surface light source device and display device can be obtained.
In addition, the wiring connection portion 35 is installed not on the back surface of the light source substrate 30 but on the mounting surface side of the point light source 20, and the recess 45 is formed on the opposing surface of the conductive plate 40, so that it is formed on the back surface. It is not necessary to provide an installation space for the wiring connection portion 35, and it is possible to prevent a reduction in the ratio of the effective emission surface of the surface light source device (the ratio of the effective emission surface to the entire surface), and the ratio of the effective display surface of the display device (over the entire surface) On the other hand, it is possible to prevent a decrease in the ratio of the effective display surface). In addition, although the part in which the point light source 20 is not mounted arises in the edge part of the light source board | substrate 30, formation of the following recessed part 45 does not reduce the effective output surface.

更に、凹部４５を構成し入射面４３と連続する連続面４６が、入射面４３となす角θを図２に示すように、９０度以上とする。９０度以上とすることにより、点状光源２０を発し、導光板４０に入射する光が直接連続面４６に到達する割合が少なくなり、凹部４５による影が生じにくくなり、局所的な明暗の少ない良好な表示品質を得ることができる。
さらに、連続面４６に関しては、次のようにするのがより望ましい。
導光板４０の屈折率をｎとした時、点状光源２０から入射した光の広がり角Φの最大値Φｍａｘは、式（１）で得られる。但し、ここで「広がり角Φ」とは、図２で、入射面４３から連続面４６が形成される起点における入射面４３との直交線を基準線とし、この基準線から測った角度とする。
連続面４６と入射面４３がなす角θが式（２）を満たすことにより、点状光源２０を発し、導光板４０に入射する光が直接連続面４６に到達することがなくなり、凹部４５による影のない、さらに良好な表示品質を得ることができる。例えば、導光板４０の屈折率ｎを１．５とすれば、θを約１３２度以上とすることが望ましい。
Φｍａｘ＝ｓｉｎ-1（１／ｎ）・・・・・（１）
θ≧９０＋Φｍａｘ
即ち、θ≧９０＋ｓｉｎ-1（１／ｎ）・・・（２） Further, the angle θ formed by the continuous surface 46 that forms the recess 45 and continues to the incident surface 43 is 90 degrees or more as shown in FIG. By setting the angle to 90 degrees or more, the proportion of light emitted from the point light source 20 and incident on the light guide plate 40 directly reaches the continuous surface 46 is reduced. Good display quality can be obtained.
Further, regarding the continuous surface 46, the following is more desirable.
When the refractive index of the light guide plate 40 is n, the maximum value Φmax of the divergence angle Φ of the light incident from the point light source 20 is obtained by Expression (1). Here, the “divergence angle Φ” is an angle measured from the reference line with a perpendicular line to the incident surface 43 at the starting point where the continuous surface 46 is formed from the incident surface 43 in FIG. .
When the angle θ formed by the continuous surface 46 and the incident surface 43 satisfies the formula (2), the light emitted from the point light source 20 and incident on the light guide plate 40 does not directly reach the continuous surface 46, and is caused by the recess 45. Even better display quality without shadows can be obtained. For example, if the refractive index n of the light guide plate 40 is 1.5, it is desirable that θ be about 132 degrees or more.
Φmax = sin −1 (1 / n) (1)
θ ≧ 90 + Φmax
That is, θ ≧ 90 + sin −1 (1 / n) (2)

なお、図２に示すように凹部４５は、配線接続部３１に対向して、導光板４０の入射面４３の一端部に設けているが（第１の凹部）、図５の表示装置の要部平面図に示すように入射面４３の長手方向の垂直二等分線１０５に対して、左右対称となるように凹部４５を設けてもよい。即ち、第１の凹部と第２の凹部を設ける。
このようにすれば、局所的な明暗の少なく、かつ、左右対称な輝度分布を得ることができ、表示品質の高い面光源装置及び表示装置を得ることができる。 As shown in FIG. 2, the recess 45 is provided at one end of the incident surface 43 of the light guide plate 40 so as to face the wiring connection portion 31 (first recess), but is essential for the display device of FIG. 5. As shown in the partial plan view, the recess 45 may be provided so as to be symmetrical with respect to the vertical bisector 105 in the longitudinal direction of the incident surface 43. That is, a first recess and a second recess are provided.
In this way, it is possible to obtain a luminance distribution with little local brightness and a symmetrical symmetry, and a surface light source device and a display device with high display quality can be obtained.

また、図１の表示装置は、表示板８０の表示図柄として避難誘導の図柄を配し、避難誘導灯の表示装置としているが、表示装置はこれに限定されるものではなく、他の図柄や文字等を表示装置の目的、用途等に応じて選定し、例えば、非常灯、道路標識、広告灯等に使用する。さらに、表示板８０として、液晶表示素子など映像信号にあわせて表示内容（表示図柄）を可変できる表示素子としてもよい。   In addition, although the display device of FIG. 1 is provided with an evacuation guide symbol as a display symbol of the display board 80 and is used as an evacuation guide lamp display device, the display device is not limited to this. Characters and the like are selected according to the purpose and application of the display device, and used for emergency lights, road signs, advertising lights, and the like. Further, the display plate 80 may be a display element such as a liquid crystal display element that can change display contents (display symbols) in accordance with a video signal.

表示板ケース１０は、その上部の外壁を、内面に光源基板３０を固定した光源カバー５０で形成しているが、光源カバー５０の部分も表示板ケース１０で形成し、光源基板３０は表示板ケース１０の内面に固定し、表示板ケース１０は、内部の部品取付け、光源基板３０の交換等の部品交換、補修等の便宜を図って、適宜分割できるようにしてもよい。   The display board case 10 has an upper outer wall formed by a light source cover 50 having a light source substrate 30 fixed to the inner surface. The light source cover 50 is also formed by the display board case 10, and the light source substrate 30 is a display board. The display board case 10 may be fixed to the inner surface of the case 10 so that it can be divided as appropriate for the convenience of component replacement such as mounting of internal components, replacement of the light source substrate 30, and repair.

本発明の面光源装置及び表示装置は、エッジライト式の面発光型光源として、避難誘導灯、非常灯、道路標識、広告灯等の表示装置として使用される。   The surface light source device and display device of the present invention are used as display devices for evacuation guide lights, emergency lights, road signs, advertising lights, and the like as edge light type surface emitting light sources.

本発明の表示装置を示す分解斜視図である。It is a disassembled perspective view which shows the display apparatus of this invention. 図１の表示装置の要部平面図である。It is a principal part top view of the display apparatus of FIG. 図１の表示装置の部分断面図である。It is a fragmentary sectional view of the display apparatus of FIG. 点状光源と導光板との間隔と面光源装置の輝度との関係を示す図である。It is a figure which shows the relationship between the space | interval of a point light source and a light-guide plate, and the brightness | luminance of a surface light source device. 本発明の別の表示装置の要部平面図である。It is a principal part top view of another display apparatus of this invention.

符号の説明Explanation of symbols

２０ 点状光源、３０ 光源基板、３１ 配線接続部、４０ 導光板、４３ 入射面、４５ 凹部、４６ 連続面、４７ 切欠き面、８０ 表示板。
20 point light source, 30 light source substrate, 31 wiring connection part, 40 light guide plate, 43 incident surface, 45 recess, 46 continuous surface, 47 notch surface, 80 display plate.

Claims (5)

点状光源と、該点状光源を実装する光源基板と、側面を入射面とし、該入射面から入射した前記点状光源の光を面光源とし、前面に照射する導光板とを備えた面光源装置において、
前記点状光源を実装する前記光源基板の実装面の端部に、前記点状光源を電源と接続させる配線接続部を設け、
また、前記導光板の側面で、前記配線接続部に対向する位置に凹部を形成したことを特徴とする面光源装置。 A surface including a point light source, a light source substrate on which the point light source is mounted, a side surface as an incident surface, a light source plate that irradiates the front surface with the light of the point light source incident from the incident surface as a surface light source In the light source device,
A wiring connection part for connecting the point light source to a power source is provided at an end of the mounting surface of the light source substrate on which the point light source is mounted,
The surface light source device is characterized in that a concave portion is formed on a side surface of the light guide plate at a position facing the wiring connection portion. 前記導光板の側面に形成した前記凹部を第１の凹部とし、前記導光板の側面の長手方向において、前記第１の凹部の位置と反対側の端部に同様な凹部である第２の凹部を形成し、前記第１の凹部と前記第２の凹部との位置は、前記導光板の入射面の長手方向において、対称位置になることを特徴とする請求項１に記載の面光源装置。   The concave portion formed on the side surface of the light guide plate is a first concave portion, and in the longitudinal direction of the side surface of the light guide plate, the second concave portion is a similar concave portion at the end opposite to the position of the first concave portion. The surface light source device according to claim 1, wherein positions of the first recess and the second recess are symmetrical with respect to a longitudinal direction of an incident surface of the light guide plate. 前記凹部は、前記入射面に連続する連続面と切欠き面とで形成し、前記入射面と前記連続面とのなす角度を９０度以上としたことを特徴とする請求項１又は請求項２に記載の面光源装置。   The said recessed part is formed by the continuous surface and notch surface which continue to the said incident surface, and made the angle which the said incident surface and the said continuous surface make more than 90 degree | times. The surface light source device described in 1. 前記入射面と前記連続面とのなす角度を、前記点状光源から入射した光の最大広がり角度に９０度を加えた角度以上としたことを特徴とする請求項３に記載の面光源装置。   The surface light source device according to claim 3, wherein an angle formed by the incident surface and the continuous surface is equal to or greater than an angle obtained by adding 90 degrees to a maximum spread angle of light incident from the point light source. 請求項１乃至請求項４のいずれかの請求項に記載の面光源装置により、表示板を照射することを特徴とする表示装置。
5. A display device that irradiates a display plate with the surface light source device according to claim 1.
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