JP3387440B2 - Surface lighting device, display device using this surface lighting device, and portable device using this display device - Google Patents
Surface lighting device, display device using this surface lighting device, and portable device using this display deviceInfo
- Publication number
- JP3387440B2 JP3387440B2 JP06816699A JP6816699A JP3387440B2 JP 3387440 B2 JP3387440 B2 JP 3387440B2 JP 06816699 A JP06816699 A JP 06816699A JP 6816699 A JP6816699 A JP 6816699A JP 3387440 B2 JP3387440 B2 JP 3387440B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light guide
- guide plate
- light emitting
- light source
- 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
Landscapes
- Telephone Set Structure (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、表示装置を背面か
ら照明する面照明装置に関し、特に発光ダイオード等の
光源を用いた面照明装置、およびそれを用いた表示装
置、およびそれを用いた携帯機器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface illuminating device for illuminating a display device from the back, and more particularly to a surface illuminating device using a light source such as a light emitting diode, a display device using the same, and a portable device using the same. Regarding equipment.
【０００２】[0002]
【従来の技術】携帯電話やパーソナルハンディホンシス
テム等に搭載される液晶表示装置のバックライトとして
用いられる面照明装置は、その光源として、小型で低消
費電力であるチップ形状の発光ダイオードを用いた光源
が使われている。さらに最近では、各種携帯情報端末機
器や携帯音響機器、デジタルカメラ，ビデオカメラ等の
携帯機器に関しても、小型化，電池の長寿命化および耐
衝撃性向上等の理由により、表示部の面照明装置用光源
が冷陰極管から発光ダイオードに変わりつつある。2. Description of the Related Art A surface lighting device used as a backlight of a liquid crystal display device mounted on a mobile phone, a personal handyphone system or the like uses a light emitting diode in the shape of a chip which is small in size and low in power consumption. A light source is used. Furthermore, recently, even in portable devices such as various portable information terminal devices, portable audio devices, digital cameras, video cameras, etc., the surface illumination device for the display section has been owing to reasons such as downsizing, longer battery life and improved shock resistance. Light sources are changing from cold cathode tubes to light emitting diodes.
【０００３】これら発光ダイオード光源を用いた従来の
面照明装置に関しては多様な構成がある。例えば、特公
平３−３２０７５号に記載されているように、液晶表示
体の背面側に上面発光の発光ダイオード光源を配置して
液晶表示体の裏面に向かって直接的に光を照射して照明
を行うものがあるが、装置の薄型化や液晶表示素子の背
面における電子回路設置上の問題等から、携帯電話等の
液晶表示装置のバックライトとしては、この液晶表示体
の背面側に直接発光ダイオード光源を配置するものは少
なくなっている。これに対して、携帯電話等の液晶表示
装置のバックライトとしては、液晶表示素子の表示面の
外側に発光ダイオード光源を配置する方法が多くとられ
ており、例えば特公平５−２１２３３号に記載されてい
るように、液晶ユニットの表示面の外側に上面発光の発
光ダイオード光源を配置して反射面と樹脂板を用いて光
を液晶表示ユニットの下方に導くことによって照明を行
うもの等が知られている。There are various configurations of conventional surface lighting devices using these light emitting diode light sources. For example, as described in Japanese Examined Patent Publication No. 3-32075, a top-emission light emitting diode light source is arranged on the back side of a liquid crystal display body to illuminate the back surface of the liquid crystal display body by directly irradiating light. However, as a backlight for liquid crystal display devices such as mobile phones, light is emitted directly to the back side of this liquid crystal display body because of the thinning of the device and problems in installing electronic circuits on the back surface of the liquid crystal display element. Fewer diode light sources are arranged. On the other hand, as a backlight of a liquid crystal display device such as a mobile phone, a method of arranging a light emitting diode light source on the outside of the display surface of a liquid crystal display element is often used, for example, as described in Japanese Patent Publication No. 5-21233. As described above, there is known a device that illuminates by arranging a light emitting diode light source of top emission on the outside of the display surface of the liquid crystal unit and guiding light below the liquid crystal display unit using a reflecting surface and a resin plate. Has been.
【０００４】このように液晶表示素子の表示面の外側に
発光ダイオード光源を配置した一例を、従来の面照明装
置として図１１、図１２を用いて説明する。図１１は従
来の面照明装置の正面図、図１２は同断面図であり、１
３１は発光ダイオードなどの光源、１３２は導光板、１
３３は光導入部、１３４は導光部、１３５は光放出部、
１３６は光放出部１３５の下面に散乱パターン１３７の
形成された散乱面、１３８は散乱面１３６の反対面とな
る光放出面、１３９は反射シート、１４０は拡散シー
ト、１４１は導光板１３２，反射シート１３９および拡
散シート１４０を保持する収納部材、１４１ｃは収納部
材１４１に形成された反射面、１４２は光源の実装され
た回路基板である。光源１３１から発せられた光は反射
面１４１ｃで反射された後、光導入部１３３より導光板
１３２の内部に入射する。この導光板１３２の内部に入
射した光は導光部１３４で拡散されて光放出部１３５に
入り、散乱パターン１３７により一部は散乱され光放出
面１３８より出射し、また一部は散乱パターン１３７を
透過し反射シート１３９により反射され再度光放出部１
３５の内部に入射後光放出面１３８より出射される。光
放出面１３８より出射した光は拡散シート１３９により
その進行方向を乱され、若干の輝度分布の一様化が図ら
れる。An example in which the light emitting diode light source is arranged outside the display surface of the liquid crystal display element will be described with reference to FIGS. 11 and 12 as a conventional surface lighting device. FIG. 11 is a front view of a conventional surface lighting device, and FIG. 12 is a sectional view of the same.
31 is a light source such as a light emitting diode, 132 is a light guide plate, 1
33 is a light introducing section, 134 is a light guiding section, 135 is a light emitting section,
Reference numeral 136 denotes a scattering surface on which a scattering pattern 137 is formed on the lower surface of the light emitting portion 135, 138 is a light emitting surface opposite to the scattering surface 136, 139 is a reflection sheet, 140 is a diffusion sheet, 141 is a light guide plate 132, and reflection. A storage member that holds the sheet 139 and the diffusion sheet 140, 141c is a reflecting surface formed on the storage member 141, and 142 is a circuit board on which a light source is mounted. The light emitted from the light source 131 is reflected by the reflection surface 141c, and then enters the inside of the light guide plate 132 from the light introducing section 133. The light incident on the inside of the light guide plate 132 is diffused by the light guide section 134 and enters the light emitting section 135, part of which is scattered by the scattering pattern 137 and emitted from the light emitting surface 138, and part of the scattering pattern 137. And is reflected by the reflection sheet 139 and is again emitted from the light emitting portion 1.
After entering the inside of 35, it is emitted from the light emitting surface 138. The light emitted from the light emitting surface 138 is disturbed in the traveling direction by the diffusion sheet 139, and the luminance distribution is slightly uniformed.
【０００５】現在、携帯機器の小型軽量化のため、面発
光装置においては導光板１３２の小型化が求められてい
る。同時に、低消費電力化および実装等のコスト削減の
ため、光源１３１の使用数削減が求められている。At present, in order to reduce the size and weight of portable devices, it is required to reduce the size of the light guide plate 132 in the surface emitting device. At the same time, it is required to reduce the number of light sources 131 used in order to reduce power consumption and cost for mounting.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、前記従
来の面照明装置等では、小型化のため図１１中に示す導
光路長Ｌ２が短小化され、光源の使用数が減ると、光放
出面１３８側から見た面内の輝度分布が増加してしま
う。図１３は光源の相対発光強度を示すグラフである。
従来の技術において、例えば光源を図１１の中央一個の
みにすると、図１１中の光放出面１３８のＳ４近辺は主
に図１３中Ｐ３付近の光を用いて照明することになるた
め、主にＰ１付近の光で照明するＳ３部とは大きな輝度
差が生じ輝度分布が悪化する。このため、図１１中破線
ｖｗおよび破線ｘｙで導光板を切断し、利用する光を図
１３中Ｐ４の内側の範囲内に規制することで輝度分布を
低減しようとする試みがなされている。ここで、図１１
中に示すように、導光板の破線ｖｗと破線ｘｙのなす角
Ａ３を導光規制角と呼ぶことにする。この導光規制角Ａ
３を狭めることで輝度分布の改善に大きな効果が認めら
れるが、一方で光源から光放出部１３５へ至る導光路長
Ｌ２を短小化させるためには逆に導光規制角Ａ３を広げ
ることが必要となる。However, in the above-described conventional surface lighting device, the light guide path length L2 shown in FIG. 11 is shortened for downsizing, and when the number of light sources used is reduced, the light emitting surface 138 is reduced. The in-plane brightness distribution seen from the side increases. FIG. 13 is a graph showing the relative light emission intensity of the light source.
In the prior art, for example, if only one light source is provided in the center of FIG. 11, the light emitting surface 138 in FIG. 11 near S4 is illuminated mainly by using light near P3 in FIG. A large difference in brightness occurs between the part S3 illuminated with light near P1 and the brightness distribution deteriorates. Therefore, an attempt has been made to reduce the luminance distribution by cutting the light guide plate along the broken line vw and the broken line xy in FIG. 11 and limiting the light to be used within the range inside P4 in FIG. Here, FIG.
As shown therein, the angle A3 formed by the broken line vw and the broken line xy of the light guide plate will be referred to as a light guide restriction angle. This light guide regulation angle A
Although narrowing 3 has a great effect on improving the luminance distribution, on the other hand, in order to shorten the light guide path length L2 from the light source to the light emitting portion 135, it is necessary to widen the light guide restriction angle A3. Becomes
【０００７】このように、従来の面照明装置では、導光
規制角Ａ３が少なくとも鈍角となり、光源からの光を十
分拡散して光放出部１３５に入射させることができない
ため、図１１におけるＳ３部近傍が明るくなりＳ４部近
傍は暗くなるという輝度分布を改善できない。このよう
な輝度分布は、液晶表示素子等のバックライトとして用
いる場合、表示文字等が一部見難くなり、さらには暗く
て認識できない表示部分を生じることにもなり、表示品
質を著しく損なってしまう。As described above, in the conventional surface illuminator, the light guide regulation angle A3 is at least an obtuse angle, and the light from the light source cannot be sufficiently diffused to enter the light emitting portion 135. Therefore, the portion S3 in FIG. It is not possible to improve the brightness distribution in which the vicinity becomes bright and the vicinity of the S4 part becomes dark. When such a brightness distribution is used as a backlight of a liquid crystal display device, some of the displayed characters are difficult to see, and even darker unrecognizable display parts are generated, which significantly impairs display quality. .
【０００８】そこで、本発明者らは、光源を導光板の角
部近傍に配置することを考案した。この光源を導光板の
角部に配置した構成を、図７、図８を用いて説明する。
図において、２１０は導光板、２１１は収納部材、２１
２は光源２１９を保持する基板、２１９は光源、２２０
は光放出部、である。光源を導光板の角部に配置するこ
とにより、導光板の隅々まで、導光することができる
が、図７に示すような配置に光源を配置すると光源近傍
の輝度が上昇し、他の部分と比較して、極端に明るいと
いう課題が発生する。それを改善するために、図８に示
すように、光放出部２２０から光源２１９を離して配置
すると、光放出部２２０以外のＢ１、Ｂ２領域が存在す
るため、Ｂ１、Ｂ２領域に導光した光が有効に活用され
ないと言う課題が発生する。Therefore, the present inventors have devised to arrange the light source in the vicinity of the corner of the light guide plate. A configuration in which the light source is arranged at a corner of the light guide plate will be described with reference to FIGS. 7 and 8.
In the figure, 210 is a light guide plate, 211 is a storage member, and 21
2 is a substrate holding the light source 219, 219 is a light source, and 220
Is a light emitting portion. By arranging the light sources at the corners of the light guide plate, it is possible to guide light to every corner of the light guide plate. However, when the light sources are arranged in the arrangement as shown in FIG. The problem is that it is extremely bright compared to the part. In order to improve it, as shown in FIG. 8, when the light source 219 is arranged away from the light emitting part 220, the B1 and B2 regions other than the light emitting part 220 are present. Therefore, the light is guided to the B1 and B2 regions. There is a problem that light is not used effectively.
【０００９】本発明は、上記の従来の課題を解決するも
のであり、発光ダイオード等の光源の使用数が少なく、
光源を導光板の角部近傍に配置しても、輝度分布が良好
でかつ平均輝度が高い面照明装置を提供することを目的
とする。The present invention solves the above-mentioned problems of the prior art by using a small number of light sources such as light emitting diodes.
An object of the present invention is to provide a surface illuminating device having a good luminance distribution and a high average luminance even when the light source is arranged near the corner of the light guide plate.
【００１０】[0010]
【課題を解決するための手段】上記の課題を解決するた
め、本発明の面照明装置は、光源と、光源からの光を面
内方向に導入する光導入部と光導入部からの光を導く導
光部と導光部から導かれてきた光を放出する光放出面と
光放出面と反対側に設けられ光を散乱させる散乱パター
ンを備えた導光板と、を備え、光源が導光板の角部に設
けられた光導入部に近接して配置された面照明装置であ
って、導光板は第１及び第２の外側面を有し第１及び第
２の外側面の間に光導入部が配置されるとともに、第１
及び第２の外側面と光放出面の輪郭との間で導光部が形
成されており、第１の外側面と第２の外側面を光放出面
輪郭に対して傾斜して設けることで、導光部において第
１及び第２の外側面と光放出面の輪郭間で規定される幅
を光導入部に近い部分よりも光導入部から遠い部分の方
を狭くした。In order to solve the above-mentioned problems, the surface lighting device of the present invention includes a light source, a light introducing section for introducing light from the light source in the in-plane direction, and a light from the light introducing section. A light guide part for guiding and a light emitting surface for emitting the light guided from the light guide part
A scattering pattern provided on the opposite side of the light emitting surface to scatter light
And a light guide plate having a light guide plate, wherein the light source is arranged in the vicinity of a light introducing portion provided at a corner of the light guide plate , wherein the light guide plate has first and second outer surfaces. Having first and second
The light introducing portion is disposed between the outer side surfaces of the second
And a light guide between the second outer surface and the contour of the light emitting surface.
The first outer surface and the second outer surface are light emitting surfaces.
By installing it at an angle to the contour,
Width defined between the contours of the first and second outer surfaces and the light emitting surface
The part farther from the light introducing part than the part closer to the light introducing part.
Narrowed .
【００１１】[0011]
【００１２】[0012]
【００１３】[0013]
【発明の実施の形態】請求項１に記載の発明は、光源
と、前記光源からの光を面内方向に導入する光導入部と
前記光導入部からの光を導く導光部と前記導光部から導
かれてきた光を放出する光放出面と前記光放出面と反対
側に設けられ光を散乱させる散乱パターンを備えた導光
板と、を備え、前記光源が前記導光板の角部に設けられ
た前記光導入部に近接して配置された面照明装置であっ
て、前記導光板は第１及び第２の外側面を有し前記第１
及び第２の外側面の間に前記光導入部が配置されるとと
もに、前記第１及び第２の外側面と前記光放出面の輪郭
との間で前記導光部が形成されており、前記第１の外側
面と前記第２の外側面が前記光放出面の輪郭に対して傾
斜して設けられ、前記第１及び第２の外側面と前記光放
出面の輪郭間で規定される前記導光部の幅を前記光導入
部に近い部分よりも前記光導入部から遠い部分の方を狭
くしたことにより、光源から光放出部へ至る導光部の広
がりを狭められ、光導入部から光放出部へ至る導光路長
を短くしても、光源の発する光を光放出部の隅々まで導
くことができ、不要な導光板領域を削減でき面発光効率
を向上できる。The invention according to claim 1 is a light source, a light introducing section for introducing light from the light source in an in-plane direction, a light guiding section for guiding light from the light introducing section, and the light guiding section. The light emitting surface that emits the light guided from the light section and the opposite side of the light emitting surface
And a light guide plate provided with a scattering pattern for scattering light provided on the side , wherein the light source is disposed in the vicinity of the light introducing portion provided at a corner of the light guide plate. , The light guide plate has first and second outer surfaces, and
And when the light introducing portion is arranged between the second outer surface and
The contours of the first and second outer surfaces and the light emitting surface.
The light guide section is formed between the first outer side
Surface and the second outer surface are inclined with respect to the contour of the light emitting surface.
The first and second outer surfaces are obliquely provided and the light emission
The width of the light guide section defined between the contours of the exit surface is introduced into the light.
The part far from the light introducing part is narrower than the part near
By Kushida, it narrowed the spread of the light guide portion extending from the light source to the light emitting unit, even by shortening the light path length extending from the light introducing portion to the light emitting unit, every corner of the light emitting portion of the light emitted by the light source The area of the light guide plate can be reduced, and the surface emission efficiency can be improved.
【００１４】[0014]
【００１５】請求項２に記載の発明は、光導入部が、斜
面を有する導光板の端面と、端面に略密着した光反射材
とにより構成され、光源が導光板の光導入部の下方に配
置されたことにより、光源が導光板の側面側に配置され
たものに比べ導光板の厚み分光源から光導入部までの距
離が増加するため、導光部の面積を小さくできる。According to a second aspect of the present invention, the light introducing section is composed of an end surface of the light guide plate having an inclined surface and a light reflecting material substantially in close contact with the end surface, and the light source is located below the light introducing section of the light guide plate. Since the light source is arranged, the distance from the light source to the light introducing portion is increased by the thickness of the light guide plate as compared with the light source arranged on the side surface side of the light guide plate, so that the area of the light guide portion can be reduced.
【００１６】[0016]
【００１７】[0017]
【００１８】請求項３に記載の発明は、請求項１に記載
の面照明装置において、光源として、少なくとも１個以
上の発光素子を有する一個の発光ダイオードを使用した
ものであり、発光効率の高い発光ダイオードを一個のみ
使用することで消費電力を削減でき、かつ発光ダイオー
ドの個体間の色バラツキを考慮しなくてよく、１個以上
の発光素子を有することで、発光色の切換ができるや故
障時の予備として用いることができる。The invention described in claim 3 is the surface lighting device according to claim 1, as a light source is obtained by using one light emitting diode having at least one or more light-emitting elements, high luminous efficiency The power consumption can be reduced by using only one light emitting diode, and it is not necessary to consider the color variation between the individual light emitting diodes, and by having one or more light emitting elements, it is possible to switch the emission color or to cause a failure. It can be used as a spare time.
【００１９】請求項４に記載の発明は、液晶表示素子
と、前記液晶表示素子を動作させる駆動回路が形成され
ている回路基板と、前記液晶表示素子と前記回路基板と
を接続する接続手段と、導光板を収納する収納部材を備
えた請求項１〜３に記載の面照明装置とを備え、前記液
晶表示素子に接続された前記接続手段が引き出された側
の導光板の辺を第１の辺とし、同じ側の前記収納部材の
外枠の辺を第２の辺とし、前記液晶表示素子の同じ側の
辺を第３の辺としたとき、前記第１の辺と前記第２の辺
とが非平行で、かつ、前記第１の辺と前記第３の辺とが
略平行であることにより、収納部材の外枠の辺で液晶表
示素子に接続された配線を損傷を抑制で、故障や誤動作
の少ない、信頼性の高い表示装置とすることができる。According to a fourth aspect of the invention, there is provided a liquid crystal display element, a circuit board on which a drive circuit for operating the liquid crystal display element is formed, and connecting means for connecting the liquid crystal display element and the circuit board. The surface lighting device according to any one of claims 1 to 5 , further comprising: a housing member that houses the light guide plate, wherein the side of the light guide plate on the side from which the connecting means connected to the liquid crystal display element is pulled out is first. When the side of the outer frame of the housing member on the same side is the second side and the side on the same side of the liquid crystal display element is the third side, the first side and the second side Since the side is non-parallel and the first side and the third side are substantially parallel, it is possible to suppress damage to the wiring connected to the liquid crystal display element at the side of the outer frame of the storage member. Therefore, a highly reliable display device with few failures and malfunctions can be provided.
【００２０】請求項５に記載の発明は、液晶表示素子が
面照明装置の背面に配置されたことにより、面照明装置
を小型化かつ低消費電力化でき、表示装置の表示面の輝
度分布も少なくできる。According to a fifth aspect of the invention, the liquid crystal display element is arranged on the back surface of the surface lighting device, so that the surface lighting device can be downsized and the power consumption can be reduced, and the brightness distribution of the display surface of the display device can be also improved. Can be reduced.
【００２１】請求項６に記載の発明は、請求項５に記載
の表示装置において、液晶表示素子の表示用配線が引き
出された側に面照明装置の光源が配置されている構成と
したものであり、光源を液晶表示素子の表示用配線で覆
うため、光源からの迷光があってもそれが表示面から漏
れ出るのを防ぐことができる。According to a sixth aspect of the invention, in the display device according to the fifth aspect, the light source of the surface illumination device is arranged on the side of the liquid crystal display element from which the display wiring is drawn out. Since the light source is covered with the display wiring of the liquid crystal display element, it is possible to prevent the stray light from the light source from leaking from the display surface.
【００２２】請求項７に記載の発明は、表示手段と、デ
ータ信号もしくは音声信号の少なくとも一方を送信信号
に変換するか受信信号をデータ信号もしくは音声信号の
少なくとも一方に変換する変換手段と、前記送信信号及
び前記受信信号を送受信するアンテナと、各部を制御す
る制御手段を備えた携帯機器であって、前記表示手段に
近接して請求項１〜３いずれか１記載の面照明装置を配
置したことにより、表示手段の輝度分布が良好で視認性
に優れ、小型化かつ低消費電力の携帯機器を実現するこ
とができる。According to a seventh aspect of the present invention, there is provided display means, conversion means for converting at least one of a data signal and a voice signal into a transmission signal or a reception signal into at least one of a data signal and a voice signal, and a transmission signal and an antenna for transmitting and receiving the reception signal, a portable device having a control means for controlling each section and in proximity to said display means is arranged to surface lighting device according to claim 1 to 3 or 1, wherein As a result, it is possible to realize a portable device having a good brightness distribution of the display means, excellent visibility, a small size, and low power consumption.
【００２３】また請求項８に記載の発明は、表示手段
と、データ信号もしくは音声信号の少なくとも一方を送
信信号に変換するか受信信号をデータ信号もしくは音声
信号の少なくとも一方に変換する変換手段と、前記送信
信号及び前記受信信号を送受信するアンテナと、各部を
制御する制御手段を備えた携帯機器であって、前記表示
手段として請求項４〜６いずれか１記載の表示装置を配
置したことにより、表示手段の輝度分布が良好で視認性
に優れ、小型化かつ低消費電力の携帯機器を実現するこ
とができる。The invention according to claim 8 is a display means, and a conversion means for converting at least one of a data signal or a voice signal into a transmission signal or converting a reception signal into at least one of a data signal or a voice signal. A mobile device comprising an antenna for transmitting and receiving the transmission signal and the reception signal, and a control means for controlling each part, wherein the display device according to any one of claims 4 to 6 is arranged as the display means. It is possible to realize a portable device that has a good brightness distribution of the display means and excellent visibility, is small in size, and has low power consumption.
【００２４】次に、本発明の本実施の形態について、図
を用いて説明する。Next, this embodiment of the present invention will be described with reference to the drawings.
【００２５】（実施の形態１）図１は本発明の実施の形
態１における面照明装置の正面図、図２は本発明の実施
の形態１における面照明装置の断面図、図３は本発明の
実施の形態１における面照明装置の要部正面図である。(Embodiment 1) FIG. 1 is a front view of a surface lighting device according to a first embodiment of the present invention, FIG. 2 is a sectional view of a surface lighting device according to a first embodiment of the present invention, and FIG. FIG. 3 is a front view of a main part of the surface lighting device according to the first embodiment of FIG.
【００２６】１は光源で、豆電球、麦球、発光ダイオー
ド等が考えられるが、ここでは非常に微小な光放出面積
（具体的には２．５ｍｍ2以下）を有する点状光源であ
り、小型で発光効率の高い発光ダイオードを用いた。こ
れにより、消費電力を低減できるとともに光源の設置面
積を低減できるので、面照明装置の小型化を実現でき
る。特に光源１として、一個の発光ダイオードのみ使用
することにより、輝度分布を悪化させることなく最も小
型化でき、さらに消費電力を削減でき、かつ発光ダイオ
ードの個体間色バラツキを考慮しなくても、色むら等の
不都合が発生することがなくなる。Reference numeral 1 denotes a light source, which may be a miniature bulb, a wheat ball, a light emitting diode, or the like. Here, a point light source having a very small light emitting area (specifically, 2.5 mm 2 or less), A small-sized light emitting diode with high luminous efficiency was used. As a result, the power consumption can be reduced and the installation area of the light source can be reduced, so that the surface lighting device can be downsized. In particular, by using only one light emitting diode as the light source 1, the size can be minimized without deteriorating the luminance distribution, the power consumption can be further reduced, and the color variation among the light emitting diodes is not considered. Inconvenience such as unevenness does not occur.
【００２７】なお光源１は１つの発光素子を有するもの
を用いても、複数の発光素子を有するものを用いてもよ
い。発光ダイオードに複数の発光素子が形成されている
場合には、発光素子を選択的に用いることができるの
で、発光色を替えたり、故障時のスペアとして利用する
ことができる。The light source 1 may have one light emitting element or may have a plurality of light emitting elements. When a plurality of light emitting elements are formed in the light emitting diode, the light emitting elements can be selectively used, so that the light emitting color can be changed and the light emitting element can be used as a spare in case of failure.
【００２８】２は導光板であり、材質としてはメタクリ
ル樹脂やポリカーボネイト樹脂等の高透過特性を有する
有機材料やガラスが好適であるが、本実施の形態では、
金型による射出成型が可能で形状の自由度と量産性が高
い樹脂製とし、さらに光の透過率が高い（実質的に９０
％以上）メタクリル樹脂を用いた。Reference numeral 2 denotes a light guide plate, and as a material thereof, an organic material having a high transmission property such as methacrylic resin or polycarbonate resin or glass is suitable, but in the present embodiment,
It is made of resin that can be injection-molded by a mold and has a high degree of freedom in shape and mass productivity, and has a high light transmittance (substantially 90%).
% Or more) Methacrylic resin was used.
【００２９】導光板２は、光導入部３，導光部４，光放
出部５より構成されている。なお、図３中の光放出部５
の角部ｒ，ｎを結ぶ点線は、導光部４と光放出部５の境
界の概要を示しており、ｍ，ｑ，ｐ，ｌ，ｏはそれぞれ
導光板２の所定の角部を示している。The light guide plate 2 is composed of a light introducing portion 3, a light guiding portion 4 and a light emitting portion 5. The light emitting portion 5 in FIG.
The dotted line connecting the corners r and n of the outline shows the outline of the boundary between the light guide portion 4 and the light emitting portion 5, and m, q, p, l, and o respectively indicate the predetermined corner portions of the light guide plate 2. ing.
【００３０】まず光導入部３は、導光板２の面内方向に
光を導く働きを有し、光源１が導光板２の下方に形成さ
れている場合には、光が入射する入射面と、その入射面
から入射してきた光を光放出部５の方に反射する働きを
有する反射面から形成されることが多い。この反射面
は、導光板２の端面に、斜面でかつ光源１付近を中心に
扇状に広がる曲面で構成され、光源１のほぼ真上に配置
されている。これにより光源１からの光が光導入部３で
拡散されて導光部４内に導入されるため、輝度分布がよ
り改善され、視認性を向上できる。また光源１が導光板
２の光導入部３の下方に配置されていることで、光源１
が導光板２の側面側に配置されたものに比べ導光板２の
厚み分光源１から光導入部３までの距離が増加するた
め、導光部４の面積を小さくでき、面照明装置をより小
型化できる。First, the light introducing portion 3 has a function of guiding light in the in-plane direction of the light guide plate 2, and when the light source 1 is formed below the light guide plate 2, it serves as an incident surface on which light is incident. In many cases, it is formed of a reflecting surface having a function of reflecting the light incident from the incident surface toward the light emitting portion 5. This reflecting surface is formed on the end surface of the light guide plate 2 as an inclined surface and a curved surface that spreads in a fan shape around the vicinity of the light source 1, and is disposed almost directly above the light source 1. Thereby, the light from the light source 1 is diffused by the light introducing section 3 and introduced into the light guide section 4, so that the luminance distribution is further improved and the visibility can be improved. Further, since the light source 1 is arranged below the light introducing portion 3 of the light guide plate 2, the light source 1
Since the distance from the light source 1 to the light introducing section 3 is increased by the thickness of the light guide plate 2 as compared with the case where the light guide plate 2 is arranged on the side surface side, the area of the light guide section 4 can be made smaller, and the surface lighting device can be further improved. Can be miniaturized.
【００３１】次に、光放出部５は、光を導光板２から外
部に放出する部分であり、一方の面は光を外部に放出す
る光放出面８となっており、反対側の端面は、散乱パタ
ーン７の形成された散乱面６となっている。散乱パター
ン７は乳白色〜白色インクで光放出部５の下面に印刷さ
れたドットであり、図３中に示すように光源１から離れ
るにつれ面積比率が増加するように配置されている。光
放出部５に入射した光は光源１に近い方が明るくなる傾
向にあり、このため上記のように散乱パターン７の印刷
面積を変化させることにより光放出面８の輝度分布をあ
る程度均一化することができる。Next, the light emitting portion 5 is a portion that emits light from the light guide plate 2 to the outside, one surface is a light emitting surface 8 that emits light to the outside, and the opposite end surface is , The scattering surface 6 on which the scattering pattern 7 is formed. The scattering patterns 7 are dots printed on the lower surface of the light emitting portion 5 with milky white to white ink, and are arranged so that the area ratio increases as the distance from the light source 1 increases, as shown in FIG. The light incident on the light emitting portion 5 tends to be brighter as it is closer to the light source 1. Therefore, the brightness distribution of the light emitting surface 8 is made uniform to some extent by changing the printing area of the scattering pattern 7 as described above. be able to.
【００３２】散乱パターン７の乳白色〜白色インクとし
てはメジウムに酸化チタン等の白色微粒子を分散させた
ものが好適であるが、必ずしも着色粒子を混入せずとも
よく、インク中にインクより屈折率の大きいガラスビー
ズを入れたり、インク中にインクより屈折率の小さい空
気泡を混入したものを用いても同様の効果が得られる。
また散乱パターン７を、印刷ではなく微少な突起または
窪みを導光板２の下面に直接多数形成することにより構
成してもよい。また導光板２の端面に近接するように別
部材で形成してもよい。As the milky white to white ink of the scattering pattern 7, a medium in which white fine particles such as titanium oxide are dispersed is preferable, but it is not always necessary to mix colored particles, and the ink has a refractive index higher than that of the ink. The same effect can be obtained by using large glass beads or mixing the ink with air bubbles having a smaller refractive index than the ink.
The scattering pattern 7 may be formed by directly forming a large number of minute projections or depressions on the lower surface of the light guide plate 2 instead of printing. Alternatively, it may be formed as a separate member so as to be close to the end surface of the light guide plate 2.
【００３３】導光部４は、導光板２の端部ｑ，ｍから相
対する角部ｐ，ｌに向かってＶ字状に広がるように形成
されている。The light guide portion 4 is formed so as to spread in a V shape from the end portions q and m of the light guide plate 2 toward the opposite corner portions p and l.
【００３４】９は散乱面６の下側に置かれた高反射率の
反射シートであり、表面に酸化チタン等が混入された白
色の反射層が形成されている。Reference numeral 9 is a reflection sheet having a high reflectance placed below the scattering surface 6, and a white reflection layer containing titanium oxide or the like is formed on the surface thereof.
【００３５】１０は導光板２の光放出部５の上面に置か
れた拡散シートで、表面に微小な凹凸が形成された半透
明のフィルムであり、光放出部５からの出射光を散乱さ
せることで照明輝度の均一化に寄与する。Reference numeral 10 denotes a diffusion sheet placed on the upper surface of the light emitting portion 5 of the light guide plate 2, which is a semitransparent film having fine irregularities formed on the surface thereof, and scatters the light emitted from the light emitting portion 5. This contributes to uniform illumination brightness.
【００３６】１１は導光板２，反射シート９および拡散
シート１０を所望の位置に保持する収納部材であり、本
実施例では形状自由度と量産性の観点から樹脂製とし
た。樹脂の種類としてはアクリロニトリル−ブタジエン
−スチレン、ポリカーボネイトなどが好ましく、また色
は白色等の反射率の高い色が好ましい。Reference numeral 11 denotes a storage member for holding the light guide plate 2, the reflection sheet 9 and the diffusion sheet 10 at desired positions, and in this embodiment, it is made of resin from the viewpoint of shape flexibility and mass productivity. The type of resin is preferably acrylonitrile-butadiene-styrene, polycarbonate or the like, and the color is preferably a color having a high reflectance such as white.
【００３７】１２は回路基板であり、光源１が実装さ
れ、収納部材１１を定位置に保持して光源１が導光板２
の光導入部３の真下に配置されるよう位置を規制してい
る。Reference numeral 12 denotes a circuit board, on which the light source 1 is mounted, the housing member 11 is held at a fixed position, and the light source 1 is guided by the light guide plate 2.
The position is regulated so as to be arranged directly below the light introducing section 3.
【００３８】以上のように構成された本実施の形態にお
ける面照明装置の動作について説明する。まず、光源１
からの光は光導入部３で反射され、多くはメタクリル樹
脂と空気の界面で起こる全反射条件を満たす角度成分を
持つ光となって導光板２内に導かれる。導光板２に入射
した光は導光部４において導光板２の幅方向に拡げら
れ、光放出部５へと導かれる。光放出部５では、その内
部に導光部４より導入された光が全反射により効率よく
閉じ込められるが、下面の散乱パターン７に当たった光
はランダムな方向に反射あるいは透過され、全反射の臨
界角を超える成分を持った光のみ導光板２の外側に出
る。このうち、光放出面８に到達した光は外部に出射さ
れるが、反射シート９および収納部材１１に当たった光
は反射されて再度光放出部５の内部に戻る。こうして、
導光板２内に導かれた光は、途中で吸収されるものを除
きほとんどが光放出面８より出射されて面照明が行われ
る。The operation of the surface lighting device of the present embodiment configured as described above will be described. First, the light source 1
The light from is reflected by the light introducing portion 3, and most of it is guided to the inside of the light guide plate 2 as light having an angular component that satisfies the condition of total reflection occurring at the interface between the methacrylic resin and air. The light that has entered the light guide plate 2 is spread in the width direction of the light guide plate 2 in the light guide portion 4, and is guided to the light emitting portion 5. In the light emitting portion 5, the light introduced from the light guide portion 4 is efficiently confined by the total reflection, but the light hitting the scattering pattern 7 on the lower surface is reflected or transmitted in random directions, and the total reflection of the light. Only light having a component exceeding the critical angle goes out of the light guide plate 2. Of these, the light that reaches the light emitting surface 8 is emitted to the outside, but the light that hits the reflection sheet 9 and the housing member 11 is reflected and returns to the inside of the light emitting portion 5 again. Thus
Most of the light guided into the light guide plate 2 is emitted from the light emitting surface 8 except for the light that is absorbed midway, and the surface illumination is performed.
【００３９】このように光源１からの光を、光導入部３
の入射面から入射させ、反射面で反射してから導光板２
の面内方向に導くことにより、導光板２の厚みにより光
源１から光導入部３までの距離が増加する分導光部４の
面積を小さくでき、面照明装置をより小型化できる。In this way, the light from the light source 1 is transmitted to the light introducing section 3
The light guide plate 2 is made to enter from the incident surface of the
By introducing the light guide plate 2 in the in-plane direction, the area of the light guide portion 4 can be reduced by the increase in the distance from the light source 1 to the light introduction portion 3 due to the thickness of the light guide plate 2, and the surface illumination device can be further downsized.
【００４０】本実施の形態においては、光源１を導光板
２の角部に配置し、そこから出射された光を導光板２の
面内方向に導く際に、入射する光の分布の中心軸が、導
光板２の外周の辺３１，３２に対して傾斜して導入する
ような構成としたことにより、導光板２の光放射部５に
より均一な輝度分布を待たせることができるので、視認
性の良好な面照明装置を実現することができる。In the present embodiment, when the light source 1 is arranged at the corner of the light guide plate 2 and the light emitted from the light source 1 is guided in the in-plane direction of the light guide plate 2, the central axis of the distribution of the incident light. However, since the light emitting portion 5 of the light guide plate 2 can be made to wait for a more uniform luminance distribution, the structure is such that the light guide plate 2 is introduced so as to be inclined with respect to the outer side edges 31 and 32 of the light guide plate 2. It is possible to realize a surface lighting device having good properties.
【００４１】本実施の形態においては、光源１を導光板
２の角部に設けられた光導入部３に近接して設ける、若
しくは光放出部５の角部に近接して配置し、導光板２の
外周側面のうち光導入部３を挟む第１の面と第２の面に
おいて、第１の面の光放出面８側の長さを第一の面に対
向する第３の面の長さよりも長く形成するとともに、第
２の面の光放出面８側の長さを第２の面に対向する第４
の面の長さよりも長く形成している。具体的には、図３
中に示すように、導光板２の対向する第１の辺３１と第
３の辺３３の組と第２の辺３２と第４の辺３４の組のそ
れぞれが、長さが異なり、非平行となるように構成して
いる。この構成により、図７で示した構成で課題となっ
ていた発光ダイオード近傍が極端に明るくなることを防
止でき、かつ、図８における導光板２の不要領域Ｂ１、
Ｂ２を削除した構成であるため、光放出部の輝度に寄与
しない導光を削減でき、面発光効率を向上させることが
できる。In the present embodiment, the light source 1 is provided in the vicinity of the light introducing portion 3 provided at the corner portion of the light guide plate 2, or is disposed in the vicinity of the corner portion of the light emitting portion 5, and the light guide plate 3 is provided. In the first surface and the second surface sandwiching the light introducing part 3 among the outer peripheral side surfaces of 2, the length of the first surface on the light emitting surface 8 side is the length of the third surface facing the first surface. And a length of the second surface on the side of the light emitting surface 8 that is opposite to the second surface.
Is formed longer than the length of the surface. Specifically, FIG.
As shown in the drawing, each of the facing first side 31 and the third side 33 and the pair of the second side 32 and the fourth side 34 of the light guide plate 2 have different lengths and are not parallel to each other. It is configured to be With this configuration, it is possible to prevent the vicinity of the light emitting diode, which has been a problem in the configuration shown in FIG. 7, from becoming extremely bright, and the unnecessary area B1 of the light guide plate 2 in FIG.
Since B2 is deleted, it is possible to reduce the amount of light guide that does not contribute to the brightness of the light emitting portion, and improve the surface emission efficiency.
【００４２】なお本実施の形態においては、辺３１〜３
４はすべて直線で構成されていたが、曲面や屈曲点を有
する場合も考えられる。この場合導光板２の端点と考え
られる点（この場合の頂点ｏ，ｐ，ｑ，ｍ，ｌに相当す
る点）をそれぞれ結んだ直線を考えることにより、本発
明の考え方を適用することが可能になる。In this embodiment, the sides 31 to 31 are formed.
Although all 4 were composed of straight lines, it is also possible to have a curved surface or a bending point. In this case, the idea of the present invention can be applied by considering the straight lines connecting the points considered to be the end points of the light guide plate 2 (the points corresponding to the vertices o, p, q, m, and l in this case). become.
【００４３】また、本実施の形態においては、導光板２
の外周面のうち、辺３２が含まれる面が、光源１から遠
ざかるに連れて光放出部５を構成する辺５ｂに近づいて
いくように、また辺３１が含まれる面が、光源１から遠
ざかるに連れて光放出部５を構成する辺５ａに近づいて
いくように構成されている。このような構成としたこと
により、光源１から出射された光をより効果的に光放出
部５方向に導くことができるので、輝度分布のより一層
の均一化を図ることができ、特に領域Ｓ２部をより効率
よく照らすことができる。さらに導光板２の投影面積を
より小さくすることができるので、面照明装置内の空間
の利用効率の向上を図ることができ、面照明装置の小型
化ならびに設計の自由度の向上を図ることができる。Further, in the present embodiment, the light guide plate 2
Of the outer peripheral surface of, the side including the side 32 approaches the side 5b forming the light emitting unit 5 as the distance from the light source 1 increases, and the side including the side 31 moves away from the light source 1. It is configured so as to approach the side 5a forming the light emitting portion 5 along with. With such a configuration, the light emitted from the light source 1 can be more effectively guided to the direction of the light emitting portion 5, so that the brightness distribution can be further homogenized, and particularly, the region S2. The part can be illuminated more efficiently. Further, since the projected area of the light guide plate 2 can be further reduced, it is possible to improve the utilization efficiency of the space in the surface lighting device, and to downsize the surface lighting device and improve the degree of freedom in design. it can.
【００４４】実際に、光放出面が一辺３０ｍｍの正方形
であり、導光路長Ｌ１が３ｍｍ，導光板２の厚みが１ｍ
ｍ，光源１として窒化ガリウム系の緑色発光ダイオード
を一個用い、対向する辺の長さが等しくて、平行な面照
明装置の一例として、前述の図７の構成のものを作成し
た。図７は、収納部材の外径が小さくできて、小型化は
可能であるが、光放出部２２０の最大輝度と最低輝度の
比（Ｒ＝ｍａｘ／ｍｉｎ）をとると、発光ダイオード近
傍が極端に明るいため、その比が小さく、Ｒ＝０．２以
下になってしまう。視覚的認識から、最大と最小の輝度
比Ｒは、０．５５以上が求められるのに対して、図７の
構成では不十分である。一方、本実施の形態において
は、光放出部５から光源１をＬ１だけ離したことによ
り、発光ダイオード近傍が極端に明るくなることが無
く、上記の最大と最小の輝度比はＲ＝０．６７を示し、
視覚認識上、充分満足されるものであった。Actually, the light emitting surface is a square with one side of 30 mm, the light guide path length L1 is 3 mm, and the thickness of the light guide plate 2 is 1 m.
m, one gallium nitride-based green light emitting diode was used as the light source 1, and an example of a plane illumination device in which opposite sides have the same length and are parallel to each other was constructed as shown in FIG. In FIG. 7, the outer diameter of the storage member can be made small and the size can be reduced, but when the ratio of the maximum luminance to the minimum luminance (R = max / min) of the light emitting portion 220 is taken, the vicinity of the light emitting diode is extremely small. Since it is extremely bright, the ratio is small and R is less than 0.2. From the visual recognition, the maximum and minimum luminance ratio R is required to be 0.55 or more, whereas the configuration of FIG. 7 is insufficient. On the other hand, in the present embodiment, by separating the light source 1 from the light emitting unit 5 by L1, the vicinity of the light emitting diode does not become extremely bright, and the above-mentioned maximum and minimum luminance ratio is R = 0.67. Indicates
It was satisfactory in terms of visual recognition.
【００４５】また、光放出面が一辺３０ｍｍの正方形で
あり、導光路長Ｌ１が３ｍｍ，導光板２の厚みが１ｍ
ｍ，光源１として窒化ガリウム系の緑色発光ダイオード
を一個用い、対向する辺の長さが等しくて、平行な面照
明装置の一例として、前記図８の構成のものを作成し
た。図８と本実施の形態は収納部材の外径は全く同じで
ある。図８の構成で、光放出部２２０の３６点の輝度を
測定して平均した平均輝度は、３５ｃｄ／ｍ2であった
のに対して、本実施の形態においては、平均輝度が４０
ｃｄ／ｍ2以上を示し、面発光効率が図８の構成に比較
して、優れていることがわかる。これは、図８の構成で
は存在する不要領域Ｂ１、Ｂ２があるため、その領域に
導光された光が、光放出部２２０の平均輝度向上にあま
り寄与していないためである。The light emitting surface is a square having a side of 30 mm, the light guide path length L1 is 3 mm, and the thickness of the light guide plate 2 is 1 m.
m, one gallium nitride-based green light emitting diode was used as the light source 1, and the structure shown in FIG. 8 was prepared as an example of a parallel illuminating device having opposite sides of equal length. In FIG. 8 and this embodiment, the outer diameter of the storage member is exactly the same. In the configuration of FIG. 8, the average luminance of the light emitting portions 220 measured at 36 points and averaged was 35 cd / m 2 , whereas in the present embodiment, the average luminance is 40 cd.
cd / m 2 or more, showing that the surface emission efficiency is superior to that of the configuration of FIG. 8. This is because the unnecessary regions B1 and B2 that exist in the configuration of FIG. 8 do not contribute much to the improvement of the average brightness of the light emitting portion 220 by the light guided to those regions.
【００４６】このように、本実施の形態においては、導
光板２の対向する第１の辺３１と第３の辺３３の組と第
２の辺３２と第４の辺３４の組のそれぞれが、長さが異
なり、非平行である構成によって、発光ダイオード近傍
が極端に明るくなることが無く、平均輝度も充分高い面
照明装置を得ることができる。また光源数の減少は消費
電流の削減を可能とし、同時に光源の基板への実装工程
を簡略化でき、低消費電力で量産性に優れた面照明装置
を得ることができる。As described above, in the present embodiment, each of the pair of opposing first side 31 and third side 33 and the pair of second side 32 and fourth side 34 of the light guide plate 2 is opposite. With the non-parallel structure having different lengths, it is possible to obtain a surface lighting device in which the vicinity of the light emitting diode does not become extremely bright and the average brightness is sufficiently high. Further, the reduction of the number of light sources enables reduction of current consumption, and at the same time, the mounting process of the light sources on the substrate can be simplified, and a surface lighting device with low power consumption and excellent mass productivity can be obtained.
【００４７】（実施の形態２）図６は本発明の実施の形
態２における面照明装置の正面図である。図中の光源
１，反射シート９，拡散シート１０，収納部材１１，回
路基板１２は実施の形態１で述べたものと同様であり、
ここでは説明を省略する。(Second Embodiment) FIG. 6 is a front view of a surface lighting device according to a second embodiment of the present invention. The light source 1, the reflection sheet 9, the diffusion sheet 10, the housing member 11, and the circuit board 12 in the figure are the same as those described in the first embodiment,
The description is omitted here.
【００４８】本実施の形態では、光放出部５が長方形に
なっており、光源１が１個であるため、長方形の長手方
向に光を多く分配する必要がある。ここで、導光板２の
光放出面８側の辺のうち光源１に近接する２辺を第１の
辺３１及び第２の辺３２とし、第１の辺３１に対向する
辺を第３の辺３３、第２の辺３２に対向する辺を第４の
辺３４としたとき、導光板２の第１の辺３１と第２の辺
３２をともに延長した交点を第１の頂点４１とし、第３
の辺３３と第４の辺３４が形成する頂点を第２の頂点４
２としたとき、第１の頂点４１と第２の頂点４２とで形
成される直線と、第１の辺の光源１に近い端点と第２の
辺の光源１に近い端点を結ぶ第６の辺３６が、成す角を
Ａ５とする。このＡ５が直角である構成にすることによ
り、光放出部５の長方形長手方向の光源１から最も遠い
部分まで、充分導光が可能になり、長方形である光放出
部５の輝度ムラが改善される。ここで、Ａ５は９０度で
あることが望ましいが、第１の辺の光源１に近い端点と
第２の辺の光源１に近い端点の位置を変えることによ
り、第６の辺の傾きを変え、Ａ５の角度を変えることが
できる。上記のように、Ａ５の角度を変えたときの輝度
ムラＲの変化を示した特性図を図９に示す。図９は、本
発明の実施の形態２における面照明装置の第６の辺の成
す角度と、輝度ムラの関係を示す特性図である。図９か
らも、わかるように角Ａ５が９０度の場合が、最も高い
値を示すのでＡ５は略垂直であることが好ましいが、前
にも述べたように、視覚的認識から、最大と最小の輝度
比Ｒは、５５％以上であれば面照明装置として利用可能
であるので、Ａ５の角度は、７５度から１０５度の間で
あればよいことになる。In this embodiment, the light emitting portion 5 is rectangular and the number of the light sources 1 is one, so that it is necessary to distribute a large amount of light in the longitudinal direction of the rectangle. Here, of the sides of the light guide plate 2 on the light emitting surface 8 side, two sides close to the light source 1 are a first side 31 and a second side 32, and a side facing the first side 31 is a third side. When the side facing the side 33 and the second side 32 is the fourth side 34, the intersection point where both the first side 31 and the second side 32 of the light guide plate 2 are extended is the first vertex 41, Third
The second vertex 4 is defined as the vertex formed by the side 33 and the fourth side 34 of
When set to 2, a sixth line connecting the straight line formed by the first vertex 41 and the second vertex 42, the end point of the first side close to the light source 1 and the end point of the second side close to the light source 1 The angle formed by the side 36 is A5. By setting the A5 to have a right angle, light can be sufficiently guided from the light source 1 in the rectangular longitudinal direction of the light emitting portion 5 to the farthest portion, and the uneven brightness of the rectangular light emitting portion 5 is improved. It Here, A5 is preferably 90 degrees, but the inclination of the sixth side is changed by changing the positions of the end points of the first side close to the light source 1 and the end points of the second side close to the light source 1. , A5 angle can be changed. FIG. 9 is a characteristic diagram showing changes in the brightness unevenness R when the angle A5 is changed as described above. FIG. 9 is a characteristic diagram showing the relationship between the angle formed by the sixth side of the surface lighting device according to the second embodiment of the present invention and the luminance unevenness. As can be seen from FIG. 9, when the angle A5 is 90 degrees, the highest value is shown, and therefore it is preferable that A5 is substantially vertical, but as described above, from the visual recognition, the maximum and the minimum are obtained. If the luminance ratio R of 55 is 55% or more, it can be used as a surface illuminating device. Therefore, the angle of A5 should be between 75 degrees and 105 degrees.
【００４９】なお本実施の形態においては、辺３１〜３
４はすべて直線で構成されていたが、曲面や屈曲点を有
する場合も考えられる。この場合導光板２の端点と考え
られる点（この場合の頂点ｏ，ｐ，ｑ，ｍ，ｌに相当す
る点）をそれぞれ結んだ直線を考えることにより、本発
明の考え方を適用することが可能になる。In this embodiment, the sides 31 to 31 are formed.
Although all 4 were composed of straight lines, it is also possible to have a curved surface or a bending point. In this case, the idea of the present invention can be applied by considering the straight lines connecting the points considered to be the end points of the light guide plate 2 (the points corresponding to the vertices o, p, q, m, and l in this case). become.
【００５０】また、本実施の形態の面照明装置を用いれ
ば、光放出面の形状がどのような形のものであっても、
小型で低消費電力でかつ表示部の視認性の良い表示装置
および携帯機器を得ることができる。Further, if the surface lighting device of the present embodiment is used, no matter what shape the light emitting surface is,
It is possible to obtain a display device and a mobile device that are small in size, have low power consumption, and have good visibility of the display unit.
【００５１】（実施の形態３）次に実施の形態１，２に
示した面照明装置を電子機器に用いた例として、特に使
用頻度の高い携帯機器を例にあげて説明する。(Third Embodiment) Next, as an example in which the surface lighting device shown in the first and second embodiments is used for an electronic device, a portable device which is particularly frequently used will be described as an example.
【００５２】図４，図５及び図１０はそれぞれ本発明の
実施の形態３における携帯機器の斜視図，断面図及びブ
ロック図である。図４，図５及び図１０において、１９
は音声を音声信号に変換するマイク、２０は音声信号を
音声に変換するスピーカー、２５はダイヤルボタン等か
ら構成される操作部、１３は表示部で、表示部１３は、
着信情報や発信情報及び検索情報等により電話番号や相
手の名前等のキャラクター等を表示し、液晶等のにより
構成されることが多く、その下方には実施の形態１〜２
に示した面照明装置が搭載されている。２１はアンテ
ナ、２２はマイク１９からの音声信号を復調して送信信
号に変換する送信部で、送信部２２で作製された送信信
号は、アンテナ２１を通して外部に放出される。２３は
アンテナ２１で受信した受信信号を音声信号に変換する
受信部で、受信部２３で作成された音声信号はスピーカ
ー２０にて音声に変換される。２４は送信部２２，受信
部２３，操作部２５，表示部１３を制御する制御部であ
る。4, 5, and 10 are a perspective view, a sectional view, and a block diagram, respectively, of a portable device according to the third embodiment of the present invention. 19 in FIGS. 4, 5 and 10.
Is a microphone for converting a voice into a voice signal, 20 is a speaker for converting a voice signal into a voice, 25 is an operation unit including a dial button, 13 is a display unit, and display unit 13 is
Characters such as a telephone number and the name of the other party are displayed according to incoming information, outgoing information, search information, etc., and are often composed of a liquid crystal or the like.
The surface illumination device shown in is mounted. Reference numeral 21 is an antenna, and 22 is a transmission unit that demodulates the audio signal from the microphone 19 and converts it into a transmission signal. The transmission signal produced by the transmission unit 22 is emitted to the outside through the antenna 21. Reference numeral 23 is a receiving unit that converts a received signal received by the antenna 21 into a voice signal, and the voice signal created by the receiving unit 23 is converted into voice by the speaker 20. A control unit 24 controls the transmission unit 22, the reception unit 23, the operation unit 25, and the display unit 13.
【００５３】以下その動作の一例について説明する。An example of the operation will be described below.
【００５４】先ず、着信があった場合には、受信部２３
から制御部２４に着信信号を送出し、制御部２４は、そ
の着信信号に基づいて、表示部１３に所定のキャラクタ
等を表示させ、更に操作部２５から着信を受ける旨のボ
タン等が押されると、信号が制御部２４に送出されて、
制御部２４は、着信モードに各部を設定する。即ちアン
テナ２１で受信した信号は、受信部２３で音声信号に変
換され、音声信号はスピーカー２０から音声として出力
されると共に、マイク１９から入力された音声は、音声
信号に変換され、送信部２２を介し、アンテナ２１を通
して外部に送出される。First, when there is an incoming call, the receiving section 23
Sends an incoming signal to the control unit 24, and the control unit 24 causes the display unit 13 to display a predetermined character or the like based on the incoming signal, and further pushes a button or the like from the operation unit 25 to accept the incoming call. Then, a signal is sent to the control unit 24,
The control unit 24 sets each unit to the incoming call mode. That is, the signal received by the antenna 21 is converted into a voice signal by the receiving unit 23, the voice signal is output as a voice from the speaker 20, and the voice input from the microphone 19 is converted into a voice signal, and the transmitting unit 22. Is transmitted to the outside through the antenna 21.
【００５５】次に、発信する場合について説明する。Next, the case of making a call will be described.
【００５６】まず、発信する場合には、操作部２５から
発信する旨の信号が、制御部２４に入力される。続いて
電話番号に相当する信号が操作部２５から制御部２４に
送られてくると、制御部２４は送信部２２を介して、電
話番号に対応する信号をアンテナ２１から送出する。こ
の時入力された信号は、表示部１３に表示されているこ
とが多い。その送出信号によって、相手方との通信が確
立されたら、その旨の信号がアンテナ２１を介し受信部
２３を通して制御部２４に送られると、制御部２４は発
信モードに各部を設定する。即ちアンテナ２１で受信し
た信号は、受信部２３で音声信号に変換され、音声信号
はスピーカー２０から音声として出力されると共に、マ
イク１９から入力された音声は、音声信号に変換され、
送信部２２を介し、アンテナ２１を通して外部に送出さ
れる。First, in the case of making a call, a signal indicating that the call is to be made is input from the operation unit 25 to the control unit 24. Subsequently, when a signal corresponding to the telephone number is sent from the operation unit 25 to the control unit 24, the control unit 24 sends a signal corresponding to the telephone number from the antenna 21 via the transmission unit 22. The signal input at this time is often displayed on the display unit 13. When communication with the other party is established by the transmission signal, a signal to that effect is sent to the control unit 24 through the receiving unit 23 via the antenna 21, and the control unit 24 sets each unit to the transmission mode. That is, the signal received by the antenna 21 is converted into a voice signal by the receiving unit 23, the voice signal is output as voice from the speaker 20, and the voice input from the microphone 19 is converted into a voice signal.
It is sent to the outside through the antenna 21 through the transmitter 22.
【００５７】なお、本実施の形態では、音声を送信受信
した例を示したが、音声に限らず、文字データ等の音声
以外のデータの送信もしくは受信の少なくとも一方を行
う電子機器についても同様な効果を得ることができる。In the present embodiment, an example in which voice is transmitted and received is shown, but the same applies to an electronic device that transmits and / or receives data other than voice, such as character data, in addition to voice. The effect can be obtained.
【００５８】次に図５を用いて表示部１３付近の構成を
さらに詳細に説明する。図５は、図４におけるＡ−Ａ断
面を示している。Next, the structure near the display unit 13 will be described in more detail with reference to FIG. FIG. 5 shows a cross section taken along the line AA in FIG.
【００５９】１４は樹脂等よりなる筺体であり、その一
部に前述の表示部１３が設けられている。１７は液晶を
用いた表示装置で、表示装置１７は、本実施の形態１若
しくは２の面照明装置の上に半透過半反射型の液晶表示
素子１５が搭載され、液晶表示素子１５の表示用配線１
６が面照明装置の光源１を覆う位置にくるよう配置され
ており、表示用配線１６は回路基板１２に接続されてい
る。表示装置１７は、本実施の形態１若しくは２の面照
明装置を用いることで視認性を低下させることなく小型
化かつ低消費電力化が図られ、また光源１からの迷光が
発生し光放出面８以外から光が漏れた場合でも、液晶表
示素子１５の表示用配線１６によりそのほとんどが遮蔽
され、その迷光が表示面から漏れ出るのを防ぐことがで
きるので、視認性のさらなる向上が図られている。Reference numeral 14 is a housing made of resin or the like, and the display portion 13 is provided on a part of the housing. Reference numeral 17 denotes a display device using liquid crystal. The display device 17 is a display device in which the transflective liquid crystal display element 15 is mounted on the surface lighting device according to the first or second embodiment. Wiring 1
6 is arranged so as to come to a position covering the light source 1 of the surface lighting device, and the display wiring 16 is connected to the circuit board 12. The display device 17 can be downsized and reduced in power consumption without lowering visibility by using the surface lighting device according to the first or second embodiment, and stray light from the light source 1 is generated to cause a light emission surface. Even if light leaks from other than 8, almost all of the light is blocked by the display wiring 16 of the liquid crystal display element 15, and the stray light can be prevented from leaking from the display surface, so that the visibility is further improved. ing.
【００６０】表示部１３は、液晶表示素子１５を透明部
材よりなる表示窓１８を通して視認する構成となってお
り、液晶表示素子１５の使用により、小型で低消費電力
でかつ表示部の視認性の良い携帯機器を得ることができ
る。The display unit 13 is configured to visually recognize the liquid crystal display element 15 through the display window 18 made of a transparent member. By using the liquid crystal display element 15, the display unit 13 is small in size, has low power consumption, and has high visibility. You can get a good mobile device.
【００６１】また、本実施の形態では、液晶表示素子１
５に接続された配線１６が引き出された側の導光板２の
光放出面８側の辺３１と同じ側の収納部材１１の外枠の
辺１１ａとが非平行で、かつ辺１１ａと液晶表示素子１
５の端部を形成する辺１５ａが略平行である構成にして
いる。単に、収納部材１１の外径寸法を小さくするため
には、導光板２の辺３１に平行に収納部材１１を削れば
よい。しかしながら、そのような構造では、光放出部５
の辺５ａに対して辺１５ａが略平行に配置される液晶表
示素子１５から引き出される表示用配線１６は、辺３１
若しくは削った収納部材１１の端部に対して略平行でな
いため、帯状の表示用配線１６の一方だけが収納部材１
１の端部と接触する構造になる。これでは、振動その他
の外力により、片当たりする表示用配線１６は損傷して
しまう。これに対して本実施の形態の構成では、配線１
６を収納部材１１の外枠の辺１１ａに均一に接触させる
ことができるので、振動などの外力が加わっても、配線
１６が損傷しにくい面照明装置を得ることができる。Further, in the present embodiment, the liquid crystal display element 1
5, the side 31 on the light emitting surface 8 side of the light guide plate 2 on the side from which the wiring 16 connected to 5 is not parallel to the side 11a of the outer frame of the housing member 11 on the same side, and the side 11a and the liquid crystal display Element 1
The sides 15a that form the end of No. 5 are substantially parallel. Simply, in order to reduce the outer diameter of the storage member 11, the storage member 11 may be cut parallel to the side 31 of the light guide plate 2. However, in such a structure, the light emitting portion 5
The display wiring 16 drawn from the liquid crystal display element 15 in which the side 15a is arranged substantially parallel to the side 5a is
Or, since it is not substantially parallel to the end of the shaved storage member 11, only one of the strip-shaped display wirings 16 is stored in the storage member 1.
The structure comes in contact with one end. In this case, the display wiring 16 that is unidirectionally contacted is damaged by vibration or other external force. On the other hand, in the configuration of this embodiment, the wiring 1
Since 6 can be brought into uniform contact with the side 11a of the outer frame of the storage member 11, it is possible to obtain a surface lighting device in which the wiring 16 is less likely to be damaged even when an external force such as vibration is applied.
【００６２】このように実施の形態１，２で示した面照
明装置を用いることによって、携帯機器の表示部におい
て、輝度むらを小さくできるので、使用者に見やすい、
従って誤認の少ない携帯機器を実現することができる。
また１つの点状光源しか用いないので、消費電力が極め
て少ない携帯機器を実現することができる。As described above, by using the surface lighting device shown in the first and second embodiments, it is possible to reduce the uneven brightness in the display section of the portable device, which is easy for the user to see.
Therefore, it is possible to realize a mobile device with few misidentifications.
Further, since only one point light source is used, it is possible to realize a portable device with extremely low power consumption.
【００６３】[0063]
【発明の効果】本発明は、光源と、光源からの光を面内
方向に導入する光導入部と光導入部からの光を導く導光
部と導光部から導かれてきた光を放出する光放出面と光
放出面と反対側に設けられ光を散乱させる散乱パターン
を備えた導光板と、を備え、光源が導光板の角部に設け
られた光導入部に近接して配置された面照明装置であっ
て、導光板は第１及び第２の外側面を有し第１及び第２
の外側面の間に光導入部が配置されるとともに、第１及
び第２の外側面と光放出面の輪郭との間で導光部が形成
されており、第１の外側面と第２の外側面を光放出面に
対して傾斜して設けることで、導光部において第１及び
第２の外側面と光放出面の輪郭間で規定される幅を光導
入部に近い部分よりも光導入部から遠い部分の方を狭く
したことで、光源から光放出部へ至る導光部の広がりを
狭められ、光導入部から光放出部へ至る導光路長を短く
しても、光源の発する光を光放出部の隅々まで導くこと
ができ、不要な導光板領域を削減できる。これにより、
発光ダイオード等の光源の使用数が少なく、光源を導光
板の角部近傍に配置しても、輝度分布が良好でかつ平均
輝度が高い面照明装置を得ることができる。According to the present invention, the light source and the light from the light source are in-plane.
Light guiding part that guides light from the light introducing part and the light introducing part
Light emitting surface that emits the light guided from the light guide and the light guide
Scattering pattern provided on the opposite side of the emission surface to scatter light
And a light source provided at a corner of the light guide plate.
Is a surface lighting device that is placed close to the
And the light guide plate has first and second outer surfaces.
The light introducing portion is arranged between the outer surfaces of the
And a light guide is formed between the second outer surface and the contour of the light emitting surface.
And the first outer surface and the second outer surface are used as light emitting surfaces.
Since the light guide portion is inclined with respect to the first and
The width defined between the contours of the second outer surface and the light emitting surface is guided.
The part farther from the light entrance is narrower than the part near the entrance
As a result, the spread of the light guide section from the light source to the light emitting section can be narrowed, and even if the length of the light guide path from the light introducing section to the light emitting section is shortened, the light emitted from the light source can reach every corner of the light emitting section. It can be guided, and the unnecessary light guide plate area can be reduced. This allows
Even if the number of light sources such as light-emitting diodes used is small and the light sources are arranged near the corners of the light guide plate, it is possible to obtain a surface illuminating device having a good luminance distribution and a high average luminance.
【００６４】[0064]
【００６５】[0065]
【図１】本発明の実施の形態１における面照明装置の正
面図FIG. 1 is a front view of a surface lighting device according to a first embodiment of the present invention.
【図２】本発明の実施の形態１における面照明装置の断
面図FIG. 2 is a sectional view of the surface lighting device according to the first embodiment of the present invention.
【図３】本発明の実施の形態１における面照明装置の要
部正面図FIG. 3 is a front view of the main parts of the surface lighting device according to Embodiment 1 of the present invention.
【図４】本発明の実施の形態３における携帯機器の正面
図FIG. 4 is a front view of a mobile device according to a third embodiment of the present invention.
【図５】本発明の実施の形態３における携帯機器の断面
図FIG. 5 is a sectional view of a mobile device according to a third embodiment of the present invention.
【図６】本発明の実施の形態２における面照明装置の正
面図FIG. 6 is a front view of a surface lighting device according to a second embodiment of the present invention.
【図７】従来の面照明装置の正面図FIG. 7 is a front view of a conventional surface lighting device.
【図８】従来の面照明装置の正面図FIG. 8 is a front view of a conventional surface lighting device.
【図９】本発明の実施の形態２における面照明装置の第
６の辺の成す角度と、輝度ムラの関係を示す特性図FIG. 9 is a characteristic diagram showing a relationship between an angle formed by a sixth side of the surface lighting device according to the second embodiment of the present invention and luminance unevenness.
【図１０】本発明の実施の形態３における携帯機器のブ
ロック図FIG. 10 is a block diagram of a mobile device according to a third embodiment of the present invention.
【図１１】従来の面照明装置の正面図FIG. 11 is a front view of a conventional surface lighting device.
【図１２】従来の面照明装置の断面図FIG. 12 is a sectional view of a conventional surface lighting device.
【図１３】光源の相対発光強度を示すグラフFIG. 13 is a graph showing relative emission intensity of a light source.
１ 光源 ２ 導光板 ３ 光導入部 ４ 導光部 ５ 光放出部 ６ 散乱面 ７ 散乱パターン ８ 光放出面 ９ 反射シート １０ 拡散シート １１ 収納部材 １２ 回路基板 １３ 表示部 １４ 筺体 １５ 液晶表示素子 １６ 表示用配線 １７ 表示装置 １８ 表示窓 １９ マイク ２０ スピーカー ２１ アンテナ ２２ 送信部 ２３ 受信部 ２４ 制御部 ２５ 操作部 ３１ 第１の辺 ３２ 第２の辺 ３３ 第３の辺 ３４ 第４の辺 ３５ 第５の辺 ３６ 第６の辺 ４１ 第１の頂点 ４２ 第２の頂点 1 light source 2 Light guide plate 3 Light introduction part 4 Light guide 5 Light emitting part 6 Scattering surface 7 scattering pattern 8 Light emitting surface 9 Reflective sheet 10 diffusion sheet 11 Storage member 12 circuit board 13 Display 14 housing 15 Liquid crystal display device 16 Display wiring 17 Display 18 Display window 19 microphone 20 speakers 21 antenna 22 Transmitter 23 Receiver 24 Control unit 25 Operation part 31 First side 32 Second side 33 Third Side 34 Fourth Side 35 Fifth Side 36 6th side 41 First vertex 42 Second vertex
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｇ０９Ｆ 9/00 ３３２ Ｇ０９Ｆ 9/00 ３３６Ｅ ３３６ Ｈ０４Ｍ 1/02 Ｃ Ｈ０４Ｍ 1/02 1/22 1/22 Ｇ０２Ｆ 1/1335 ５３０ (72)発明者 上鶴 忍 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (58)調査した分野(Int.Cl.7，ＤＢ名) F21V 8/00 601 G02B 5/02 G02F 1/13357 G09F 9/00 332 G09F 9/00 336 H04M 1/02 H04M 1/22 Continuation of front page (51) Int.Cl. 7 Identification code FI G09F 9/00 332 G09F 9/00 336E 336 H04M 1/02 C H04M 1/02 1/22 1/22 G02F 1/1335 530 (72) Invention Person Kaminazuru Shinobu 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (58) Fields investigated (Int.Cl. 7 , DB name) F21V 8/00 601 G02B 5/02 G02F 1/13357 G09F 9 / 00 332 G09F 9/00 336 H04M 1/02 H04M 1/22
Claims (8)
入する光導入部と前記光導入部からの光を導く導光部と
前記導光部から導かれてきた光を放出する光放出面と前
記光放出面と反対側に設けられ光を散乱させる散乱パタ
ーンを備えた導光板と、を備え、前記光源が前記導光板
の角部に設けられた前記光導入部に近接して配置された
面照明装置であって、前記導光板は第１及び第２の外側
面を有し前記第１及び第２の外側面の間に前記光導入部
が配置されるとともに、前記第１及び第２の外側面と前
記光放出面の輪郭との間で前記導光部が形成されてお
り、前記第１の外側面と前記第２の外側面が前記光放出
面の輪郭に対して傾斜して設けられ、前記第１及び第２
の外側面と前記光放出面の輪郭間で規定される前記導光
部の幅を前記光導入部に近い部分よりも前記光導入部か
ら遠い部分の方を狭くしたことを特徴とする面照明装
置。1. A light source, a light introducing section for introducing the light from the light source in an in-plane direction, a light guiding section for guiding the light from the light introducing section, and emitting the light guided from the light guiding section. Light emitting surface and front
A scattering pattern provided on the side opposite to the light emitting surface for scattering light.
And a light guide plate having a chromatography down, the light source is an arranged planar illumination device in proximity to the light introducing portion provided at a corner of the light guide plate, the light guide plate and the first and Second outside
A light guide part having a surface between the first and second outer surfaces
Is disposed and the first and second outer surfaces and the front
The light guide section is formed between the light emitting surface and the contour of the light emitting surface.
The first outer surface and the second outer surface emit the light.
The first and the second are provided to be inclined with respect to the contour of the surface.
The light guide defined between the outer surface of the and the contour of the light emitting surface.
The width of the part is closer to the light introducing part than the part closer to the light introducing part.
A surface illuminator characterized by narrowing the part farther from it.
と、前記端面に略密着した光反射材とにより構成され、
光源が前記導光板の前記光導入部の下方に配置された請
求項１に記載の面照明装置。2. The light introducing section is composed of an end surface of a light guide plate having a slope and a light reflecting material which is in close contact with the end surface.
The surface lighting device according to claim 1, wherein a light source is arranged below the light introducing portion of the light guide plate.
子を有する一個の発光ダイオードを使用したことを特徴
とする請求項１に記載の面照明装置。3. The surface lighting device according to claim 1, wherein one light emitting diode having at least one light emitting element is used as the light source.
させる駆動回路が形成されている回路基板と、前記液晶
表示素子と前記回路基板とを接続する接続手段と、導光
板を収納する収納部材を備えた請求項１〜３に記載の面
照明装置とを備え、前記液晶表示素子に接続された前記
接続手段が引き出された側の導光板の辺を第１の辺と
し、同じ側の前記収納部材の外枠の辺を第２の辺とし、
前記液晶表示素子の同じ側の辺を第３の辺としたとき、
前記第１の辺と前記第２の辺とが非平行で、かつ、前記
第１の辺と前記第３の辺とが略平行であることを特徴と
する表示装置。4. A liquid crystal display device, a circuit board on which a drive circuit for operating the liquid crystal display device is formed, connecting means for connecting the liquid crystal display device and the circuit board, and a housing for housing a light guide plate. and a surface lighting device according to claim 1 to 3 comprising a member, the liquid crystal display element connected to said connection means is drawn out side of the side of the light guide plate and the first side, the same side The side of the outer frame of the storage member is the second side,
When the same side of the liquid crystal display element is the third side,
A display device, wherein the first side and the second side are not parallel to each other, and the first side and the third side are substantially parallel to each other.
れたことを特徴とする請求項４記載の表示装置。5. The display device according to claim 4, wherein the liquid crystal display element is arranged on the back surface of the surface lighting device.
れた側に面照明装置の光源が配置されていることを特徴
とする請求項５に記載の表示装置。6. The display device according to claim 5 , wherein the light source of the surface illumination device is arranged on the side from which the wiring connected to the liquid crystal display element is drawn out.
の少なくとも一方を送信信号に変換するか受信信号をデ
ータ信号もしくは音声信号の少なくとも一方に変換する
変換手段と、前記送信信号及び前記受信信号を送受信す
るアンテナと、各部を制御する制御手段を備えた携帯機
器であって、前記表示手段に近接して請求項１〜３いず
れか１記載の面照明装置を配置したことを特徴とする携
帯機器。7. A display means, a conversion means for converting at least one of a data signal and a voice signal into a transmission signal or a reception signal into at least one of a data signal and a voice signal, and the transmission signal and the reception signal. a transmitting and receiving antenna, a mobile device having a control means for controlling each section, a portable device, characterized in that in proximity to said display means is arranged to surface lighting device according to claim 1 to 3 or 1, wherein .
の少なくとも一方を送信信号に変換するか受信信号をデ
ータ信号もしくは音声信号の少なくとも一方に変換する
変換手段と、前記送信信号及び前記受信信号を送受信す
るアンテナと、各部を制御する制御手段を備えた携帯機
器であって、前記表示手段として請求項４〜６いずれか
１記載の表示装置を配置したことを特徴とする携帯機
器。8. A display means, a conversion means for converting at least one of a data signal and a voice signal into a transmission signal or a reception signal into at least one of a data signal and a voice signal, and the transmission signal and the reception signal. A mobile device comprising an antenna for transmitting and receiving, and a control means for controlling each part, wherein the display device according to any one of claims 4 to 6 is arranged as the display means.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06816699A JP3387440B2 (en) | 1999-03-15 | 1999-03-15 | Surface lighting device, display device using this surface lighting device, and portable device using this display device |
| US09/524,587 US7088333B1 (en) | 1999-03-12 | 2000-03-13 | Surface lighting device and portable terminal using the same |
| US10/802,702 US7492346B2 (en) | 1999-03-12 | 2004-03-17 | Surface lighting device and portable terminal using the same |
| US12/350,627 US8144088B2 (en) | 1999-03-12 | 2009-01-08 | Surface lighting device and portable terminal using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06816699A JP3387440B2 (en) | 1999-03-15 | 1999-03-15 | Surface lighting device, display device using this surface lighting device, and portable device using this display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000268621A JP2000268621A (en) | 2000-09-29 |
| JP3387440B2 true JP3387440B2 (en) | 2003-03-17 |
Family
ID=13365920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06816699A Expired - Fee Related JP3387440B2 (en) | 1999-03-12 | 1999-03-15 | Surface lighting device, display device using this surface lighting device, and portable device using this display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3387440B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6789910B2 (en) * | 2000-04-12 | 2004-09-14 | Semiconductor Energy Laboratory, Co., Ltd. | Illumination apparatus |
| JP2004047294A (en) | 2002-07-12 | 2004-02-12 | Canon Inc | Backlight device and display device |
| JP2007079495A (en) * | 2005-09-16 | 2007-03-29 | Sony Corp | Back light device and liquid crystal display device |
| CN100498455C (en) * | 2005-11-10 | 2009-06-10 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| KR100766337B1 (en) * | 2006-12-22 | 2007-10-12 | (주)아토콘 | Light emitting keypad |
| US20120257107A1 (en) * | 2009-12-28 | 2012-10-11 | Sharp Kabushiki Kaisha | Illumination device, liquid crystal display device and television receiver device |
| CN110177442A (en) * | 2019-06-17 | 2019-08-27 | 新疆工程学院 | A kind of electronic information wireless communication device |
-
1999
- 1999-03-15 JP JP06816699A patent/JP3387440B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000268621A (en) | 2000-09-29 |
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