JP5062735B2 - Display device - Google Patents

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JP5062735B2
JP5062735B2 JP2007133267A JP2007133267A JP5062735B2 JP 5062735 B2 JP5062735 B2 JP 5062735B2 JP 2007133267 A JP2007133267 A JP 2007133267A JP 2007133267 A JP2007133267 A JP 2007133267A JP 5062735 B2 JP5062735 B2 JP 5062735B2
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light
light guide
main body
scattering
image display
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JP2008287099A (en
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賢一 鶴田
彰 鬼切
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Citizen Electronics Co Ltd
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Citizen Electronics Co Ltd
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Description

本発明は、例えば明るい場所だけでなく夜間や暗闇等の暗所でも視認可能でかつ表裏面表示の可能な表示装置に関する。   The present invention relates to a display device that can be viewed not only in a bright place but also in a dark place such as at night or in the dark, and capable of front and back display.

近年、種々の表示装置が開発されている中で、薄型かつ軽量であり紙媒体に代わる表示媒体として価格ラベル、電子書籍及び電子新聞等の用途に期待されている電子ペーパーの開発が進んでいる。この電子ペーパーは、電子ディスプレイと紙の長所を併せ持つものであり、画像情報を無電源状態でも表示したまま保持することができると共に書き換え可能なものである。また、電子ペーパーは、従来の透過型液晶表示装置などに比べて反射型であるためにコントラスト比が変わらず視野角が広い利点がある。例えば、特許文献１には、電気泳動素子を利用したカラー電子ペーパー表示装置が提案されている。   In recent years, various types of display devices have been developed, and the development of electronic paper that is thin and lightweight and is expected to be used for price labels, electronic books, electronic newspapers, and the like as a display medium replacing a paper medium is progressing. . This electronic paper has both the advantages of an electronic display and paper, and can retain image information while it is displayed even in a non-powered state and is rewritable. In addition, since electronic paper is a reflective type as compared with a conventional transmissive liquid crystal display device or the like, there is an advantage that the contrast ratio does not change and the viewing angle is wide. For example, Patent Document 1 proposes a color electronic paper display device using an electrophoretic element.

特開２００７−４１１６９号公報JP 2007-41169 A

しかしながら、上記従来の技術には、以下の課題が残されている。
すなわち、従来の電子ペーパーでは、非自発光型の表示媒体であると共に、反射型であるために太陽光や蛍光灯などの外部からの光を反射させることで視認可能になっているが、夜間や暗闇等の暗所では表示内容を視認することができない不都合がある。また、電子ペーパーは、その構造上、反射型であるために液晶表示装置のように透過型にしてバックライトで背面から光を透過させる方法を採用することも困難であった。さらに、表裏面にそれぞれ画像情報を表示可能に構成された電子ペーパーなどの場合、表裏面に別々に照明機構を設けることで、暗所において両面の視認が可能になるが、全体が厚くかつ構造が複雑になってしまうと共に高コストになる不都合があった。 However, the following problems remain in the conventional technology.
In other words, the conventional electronic paper is a non-self-luminous display medium and is reflective so that it can be visually recognized by reflecting light from the outside such as sunlight and fluorescent lamps. There is an inconvenience that the display contents cannot be visually recognized in a dark place such as a dark place. In addition, since electronic paper is a reflection type because of its structure, it has been difficult to adopt a method of transmitting light from the back side by using a backlight as in a liquid crystal display device. Furthermore, in the case of electronic paper and the like configured to be able to display image information on the front and back surfaces respectively, by providing a separate illumination mechanism on the front and back surfaces, both sides can be viewed in the dark, but the overall is thick and structured However, there is a disadvantage that it becomes complicated and expensive.

本発明は、前述の課題に鑑みてなされたもので、夜間や暗闇等の暗所でも表裏面の表示内容を視認可能であると共に低コストで作製可能な表示装置を提供することを目的とする。   The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a display device capable of visually recognizing display contents on the front and back surfaces even in a dark place such as nighttime or darkness and capable of being manufactured at low cost. .

本発明は、前記課題を解決するために以下の構成を採用した。すなわち、本発明の表示装置は、表裏面にそれぞれ画像情報を表示可能かつ書き換え可能な画像表示本体と、該画像表示本体の表裏面のそれぞれを照明するライトユニットと、を備え、該ライトユニットが、前記画像表示本体の表裏面のそれぞれに配され自身の表裏面から入射された光を透過可能であると共に端部から入射された光を導光し散乱させて少なくとも前記画像表示本体側に出射させる一対の導光散乱部材と、前記一対の導光散乱部材の端部に配され内部に入射された光を導光し前記一対の導光散乱部材の端部に対向した端面から出射して前記一対の導光散乱部材内に入射させる線状導光部材と、前記線状導光部材内に光を入射する光源と、を備えていることを特徴とする。   The present invention employs the following configuration in order to solve the above problems. That is, the display device of the present invention includes an image display body that can display and rewrite image information on the front and back surfaces, and a light unit that illuminates each of the front and back surfaces of the image display body. The light incident on the front and back surfaces of the image display body is transmitted through the front and back surfaces of the image display body, and the light incident from the end is guided and scattered to be emitted to at least the image display body side. A pair of light guiding / scattering members to be guided, and light incident on the inside of the pair of light guiding / scattering members to be guided and emitted from an end surface opposed to the ends of the pair of light guiding / scattering members. A linear light guide member that is incident on the pair of light guide scattering members, and a light source that emits light into the linear light guide member.

この表示装置では、画像表示本体の表裏面に配された一対の導光散乱部材と、これらに光源からの光を入射可能な線状導光部材と、を備えているので、光源からの光が、線状導光部材内を導光され、線状導光部材から画像表示本体の表裏面にそれぞれ配された一対の導光散乱部材内に入射されて各導光散乱部材から画像表示本体の表裏面に出射され、照明を行う。そして、その反射光を導光散乱部材内を透過させることで、暗所であっても表裏面の表示内容を視認することができる。また、一つのライトユニットで表裏面をそれぞれ照明するので、部材点数を削減することができ、装置全体の簡略化、薄型化及び低コスト化を図ることができる。さらに、ライトユニットが、ＬＥＤ等の光源及び樹脂製シート等の導光散乱部材で簡易に構成可能なため、非常に安価に製造することができる。   Since this display device includes a pair of light guide scattering members disposed on the front and back surfaces of the image display main body and a linear light guide member capable of receiving light from the light source thereto, the light from the light source is provided. Is guided through the linear light guide member and is incident on a pair of light guide scattering members respectively arranged on the front and back surfaces of the image display main body from the linear light guide member, and the image display main body from each light guide scattering member The light is emitted to the front and back surfaces of the light and illuminated. And the display content of front and back can be visually recognized even if it is a dark place by allowing the reflected light to permeate | transmit the inside of a light guide scattering member. Further, since the front and back surfaces are respectively illuminated by one light unit, the number of members can be reduced, and the entire apparatus can be simplified, thinned, and reduced in cost. Furthermore, since the light unit can be easily configured with a light source such as an LED and a light guide scattering member such as a resin sheet, the light unit can be manufactured at a very low cost.

また、本発明の表示装置は、前記導光散乱部材が、端部から入射された光の導波方向に対して低い散乱特性を有していると共に前記導波方向に対して直交する方向には高い散乱特性を有する異方性散乱部材であることを特徴とする。すなわち、この表示装置では、導光散乱部材として、光の導波方向よりも該導波方向の直交方向における散乱特性が相対的に高い異方性散乱部材を採用するので、端部から入射された光を効率的に導光かつ異方散乱させて画像表示本体の全域を均等に照明可能であると共に、表面からの蛍光灯や太陽光などの光や画像表示本体から反射した光を効率的に透過させることができる。   In the display device of the present invention, the light guide / scattering member has low scattering characteristics with respect to a waveguide direction of light incident from an end portion and is orthogonal to the waveguide direction. Is an anisotropic scattering member having high scattering characteristics. That is, in this display device, an anisotropic scattering member having a relatively high scattering characteristic in the direction orthogonal to the light guide direction is used as the light guide scattering member. Light can be efficiently guided and anisotropically scattered to uniformly illuminate the entire area of the image display body, and light such as fluorescent light and sunlight from the surface and light reflected from the image display body can be efficiently Can be transmitted through.

さらに、本発明の表示装置は、前記異方性散乱部材が、レンチキュラーレンズフィルムであることを特徴とする。すなわち、この表示装置では、異方性散乱部材としてレンチキュラーレンズフィルムを採用するので、光の導波方向に対して平行する方向に線状に延在した複数の半割円柱状のレンズ群によって効率的な異方性散乱を得ることができる。   Furthermore, the display device of the present invention is characterized in that the anisotropic scattering member is a lenticular lens film. That is, in this display device, since a lenticular lens film is employed as the anisotropic scattering member, the display device is efficiently operated by a plurality of halved cylindrical lens groups extending linearly in a direction parallel to the light guiding direction. Anisotropic scattering can be obtained.

また、本発明の表示装置は、前記画像表示本体が、表裏面にそれぞれ画像情報を書き換え可能かつ無電源状態で表示保持可能な電子ペーパー本体であることを特徴とする。すなわち、この表示装置では、画像表示本体として電子ペーパー本体を採用するので、明るい場所だけでなく暗所においても非自発光型である電子ペーパーを活用することが可能になる。   In the display device of the present invention, the image display main body is an electronic paper main body that can rewrite image information on the front and back surfaces and can display and hold the image information in a non-powered state. That is, in this display device, since the electronic paper main body is adopted as the image display main body, it is possible to use electronic paper that is non-self-luminous type not only in a bright place but also in a dark place.

本発明によれば、以下の効果を奏する。
すなわち、本発明に係る表示装置によれば、画像表示本体の表裏面に配された一対の導光散乱部材と、これらに光源からの光を入射可能な線状導光部材と、を備えているので、暗所であっても表裏面の表示内容を視認することができると共に、装置全体の簡略化、薄型化及び低コスト化を図ることができる。特に、画像表示本体として電子ペーパー本体を採用することで、明るい場所だけでなく暗所においても両面表示の電子ペーパーを活用することができ、場所等の適用環境や適用機器などを大幅に拡大することが可能になる。 The present invention has the following effects.
That is, the display device according to the present invention includes a pair of light guide scattering members disposed on the front and back surfaces of the image display main body, and a linear light guide member that can receive light from the light source. Therefore, the display contents on the front and back surfaces can be visually recognized even in a dark place, and the entire apparatus can be simplified, thinned, and reduced in cost. In particular, by adopting an electronic paper body as the image display body, double-sided electronic paper can be used not only in a bright place but also in a dark place, which greatly expands the application environment and applicable equipment in places, etc. It becomes possible.

以下、本発明に係る表示装置の第１実施形態を、図１から図４に基づいて説明する。なお、以下の説明に用いる各図面では、各部材を認識可能な大きさとするために縮尺を適宜変更している。   Hereinafter, a display device according to a first embodiment of the present invention will be described with reference to FIGS. In each drawing used in the following description, the scale is appropriately changed to make each member a recognizable size.

本実施形態における表示装置は、図１及び図２に示すように、表裏面にそれぞれ画像情報を書き換え可能かつ無電源状態で表示保持可能な電子ペーパー本体（画像表示本体）１と、該電子ペーパー本体１の表裏面のそれぞれを照明するライトユニット２とを備えた電子ペーパー表示装置である。
上記電子ペーパー本体１は、図３及び図４に示すように、一対の電子ペーパー体１ａを互いに背面側を重ねて設けられ、表裏面がそれぞれ画像情報を表示可能な表示面とされたものである。この電子ペーパー本体１の電子ペーパー体１ａは、インク層３の裏側（背面側）にドライバ層４を配すると共に表側（表示面側）に透明フィルム５を配したサンドイッチ構造を有している。
上記インク層３は、マクロカプセルや帯電ビーズなどからなる層である。また、上記ドライバ層４は、アクティブマトリックスのＴＦＴで構成されており、電子ペーパーの表示制御を行う機能を有する。 As shown in FIGS. 1 and 2, the display device according to the present embodiment includes an electronic paper main body (image display main body) 1 that can rewrite image information on the front and back surfaces and can hold display in a non-powered state, and the electronic paper. The electronic paper display device includes a light unit 2 that illuminates the front and back surfaces of the main body 1.
As shown in FIGS. 3 and 4, the electronic paper main body 1 is provided with a pair of electronic paper bodies 1 a overlapped with each other on the back side, and the front and back surfaces are display surfaces capable of displaying image information. is there. The electronic paper body 1a of the electronic paper main body 1 has a sandwich structure in which a driver layer 4 is arranged on the back side (back side) of the ink layer 3 and a transparent film 5 is arranged on the front side (display surface side).
The ink layer 3 is a layer made of macrocapsules or charged beads. The driver layer 4 is composed of active matrix TFTs and has a function of controlling display of electronic paper.

電子ペーパー本体１の電子ペーパー体１ａとしては、例えばマクロカプセルを使った電気泳動方式の電子ペーパーや白黒塗り分けた帯電ビーズを使用した方式の電子ペーパーが採用される。例えば、電気泳動方式の電子ペーパーの場合、青色の液体と白色の酸化チタン粒子等の帯電粒子とをマイクロカプセルに入れ、このマイクロカプセルからなるインク層３の裏側に電極であるドライバ層４を配置している。この方式の電子ペーパーでは、白色粒子がマイクロカプセルの表側にあるときには、白色表示に見えるが、電極にマイナスの電圧を印加して帯電粒子を裏側に引き寄せると、青色の液体が表側になって、黒色表示に見えるようになることで、白黒制御を行っている。   As the electronic paper body 1a of the electronic paper main body 1, for example, an electrophoretic electronic paper using macrocapsules or an electronic paper using black and white charged beads is adopted. For example, in the case of electrophoretic electronic paper, a blue liquid and charged particles such as white titanium oxide particles are placed in a microcapsule, and a driver layer 4 as an electrode is disposed on the back side of the ink layer 3 made of the microcapsule. is doing. In this type of electronic paper, when white particles are on the front side of the microcapsule, white display appears, but when a negative voltage is applied to the electrode and the charged particles are pulled to the back side, the blue liquid becomes the front side, Black-and-white control is performed by making it appear black.

上記ライトユニット２は、電子ペーパー本体１の表裏面のそれぞれに配され自身の表裏面から入射された光を透過可能であると共に端部から入射された光を導光し散乱させて少なくとも電子ペーパー本体１側に出射させる一対の導光散乱部材６と、一対の導光散乱部材６の端部に配され内部に入射された光を導光し一対の導光散乱部材６の端部に対向した端面７ａから出射して一対の導光散乱部材６内に入射させる線状導光部材７と、線状導光部材７内に光を入射する光源８と、線状導光部材７に沿ってその背面（導光散乱部材６の端部側と反対側）に配された反射板９と、を備えている。   The light unit 2 is arranged on each of the front and back surfaces of the electronic paper main body 1 and is capable of transmitting light incident from the front and back surfaces of the electronic paper body 1 and guides and scatters light incident from the end portion to at least electronic paper. A pair of light guide / scattering members 6 to be emitted to the main body 1 side, and light incident on the inside of the pair of light guide / scattering members 6 are guided and opposed to the ends of the pair of light guide / scattering members 6. Along the linear light guide member 7, a linear light guide member 7 that exits from the end face 7 a and enters the pair of light guide scattering members 6, a light source 8 that enters light into the linear light guide member 7, and the linear light guide member 7. And a reflection plate 9 disposed on the rear surface (the side opposite to the end side of the light guide scattering member 6).

上記導光散乱部材６は、シート状、フィルム状又は板状のものであり、特にシート状やフィルム状のものを採用すれば、薄型である電子ペーパー本体１と共に装置全体の薄型化が可能であると共に、容易に曲がるので電子ペーパー本体１を曲げて使用する際にも適用可能になる。   The light guide scattering member 6 is in the form of a sheet, film, or plate. In particular, if a sheet or film is used, the entire apparatus can be thinned together with the thin electronic paper main body 1. In addition, since it bends easily, it can be applied when the electronic paper body 1 is bent and used.

また、導光散乱部材６は、等方性散乱を行う拡散フィルムなどであって、所定のヘイズ値と厚さとに設定されている。なお、上記ヘイズ値は、透明性又は曇り度合いを測る目安であり、散乱光線透過率を全光線透過率で割ったものを百分率で表したものである。   The light guide scattering member 6 is a diffusion film that performs isotropic scattering, and is set to a predetermined haze value and thickness. In addition, the said haze value is a standard which measures transparency or a cloudiness degree, and represents what was obtained by dividing the scattered light transmittance by the total light transmittance.

導光散乱部材６としては、例えばＰＣ（ポリカーボネート）、ＰＭＭＡ（メタクリル酸メチル樹脂（アクリル樹脂））、ＣＯＰ（シクロオレフィンポリマー）又はＰＥＴ（ポリエチレンテレフタラート）などの一層フィルム、これらいずれか一つの樹脂とＵＶ（紫外線）硬化樹脂との二層フィルム、シリコンフィルム等のエラストマー樹脂フィルムなどが用いられる。   As the light guide scattering member 6, for example, a single layer film such as PC (polycarbonate), PMMA (methyl methacrylate resin (acrylic resin)), COP (cycloolefin polymer), or PET (polyethylene terephthalate), any one of these resins And a two-layer film of UV (ultraviolet) curable resin, an elastomer resin film such as a silicon film, and the like are used.

上記線状導光部材７は、透明なポリカーボネート樹脂やアクリル樹脂等で形成されており、端部から入射される光源８からの光を導光すると共に反射及び拡散により端面７ａか導光散乱部材６の端部に出射するものである。なお、この線状導光部材７の背面は、内部に入射され導光される光を導光散乱部材６の端部側に反射させる複数の傾斜面等の加工が施されている。
上記反射板９は、光反射機能を有する金属板、フィルム、箔等である。この反射板９は、線状導光部材７の背面から出た光を反射して、再度、線状導光部材７内に入射させる機能を有している。 The linear light guide member 7 is formed of a transparent polycarbonate resin, acrylic resin, or the like, guides light from the light source 8 incident from the end, and reflects or diffuses the end surface 7a or the light guide scattering member. 6 is emitted to the end portion. The back surface of the linear light guide member 7 is subjected to processing such as a plurality of inclined surfaces that reflect the light that is incident and guided therethrough to the end portion side of the light guide scattering member 6.
The reflection plate 9 is a metal plate, film, foil or the like having a light reflection function. The reflecting plate 9 has a function of reflecting the light emitted from the back surface of the linear light guide member 7 so as to enter the linear light guide member 7 again.

上記光源８は、線状導光部材７の端部に配置された白色ＬＥＤである。この白色ＬＥＤは、例えば基板上の一つ又は複数の半導体発光素子を樹脂材で封止したものであり、半導体発光素子として、例えば青色（波長λ：４７０〜４９０ｎｍ）ＬＥＤ素子又は紫外光（波長λ：４７０ｎｍ未満）ＬＥＤ素子であって、例えばサファイア基板などの絶縁性基板上に窒化ガリウム系化合物半導体（例えばＩｎＧａＮ系化合物半導体）の複数の半導体層が積層されて形成されたものである。   The light source 8 is a white LED arranged at the end of the linear light guide member 7. This white LED is, for example, one or a plurality of semiconductor light emitting elements on a substrate sealed with a resin material. As the semiconductor light emitting element, for example, a blue (wavelength λ: 470 to 490 nm) LED element or ultraviolet light (wavelength) (λ: less than 470 nm) LED element, which is formed by laminating a plurality of semiconductor layers of a gallium nitride-based compound semiconductor (for example, an InGaN-based compound semiconductor) on an insulating substrate such as a sapphire substrate.

また、この半導体発光素子を封止する樹脂材は、シリコーン樹脂を主剤とし、例えばＹＡＧ蛍光体が添加されている。このＹＡＧ蛍光体は、半導体発光素子からの青色光又は紫外光を黄色光に変換させて混色効果により白色光を生じさせるものである。なお、白色ＬＥＤとしては、上記以外でも種々のものが採用可能である。   Further, the resin material for sealing the semiconductor light emitting element is mainly composed of a silicone resin and, for example, a YAG phosphor is added. This YAG phosphor converts white light or ultraviolet light from a semiconductor light emitting element into yellow light and generates white light by a color mixing effect. Various white LEDs other than those described above can be used.

このように本実施形態の表示装置では、電子ペーパー本体１の表裏面に配された一対の導光散乱部材６と、これらに光源８からの光を入射可能な線状導光部材７と、を備えているので、電子ペーパー本体１の表裏面をそれぞれ照明することができる。すなわち、光源８からの光が、線状導光部材７内を導光され、線状導光部材７から電子ペーパー本体１の表裏面にそれぞれ配された一対の導光散乱部材６内に入射されて各導光散乱部材６から電子ペーパー本体１の表裏面に出射され、照明を行う。そして、その反射光を導光散乱部材６内を透過させることで、暗所であっても表裏面の表示内容を視認することができる。   Thus, in the display device of this embodiment, a pair of light guide scattering members 6 disposed on the front and back surfaces of the electronic paper main body 1, a linear light guide member 7 capable of receiving light from the light source 8 on these, Therefore, the front and back surfaces of the electronic paper main body 1 can be illuminated respectively. That is, the light from the light source 8 is guided through the linear light guide member 7 and enters the pair of light guide scattering members 6 respectively disposed on the front and back surfaces of the electronic paper main body 1 from the linear light guide member 7. Then, the light is emitted from each light guide scattering member 6 to the front and back surfaces of the electronic paper main body 1 to perform illumination. And the display content of front and back can be visually recognized even if it is a dark place by transmitting the inside of the light guide scattering member 6 in the reflected light.

また、一つのライトユニット２で電子ペーパー本体１の表裏面をそれぞれ照明するので、部材点数を削減することができ、装置全体の簡略化、薄型化及び低コスト化を図ることができる。すなわち、電子ペーパー本体１の表裏面それぞれに別個に光源８及び線状導光部材７を設ける必要が無く、一つの光源８及び線状導光部材７で兼用することができる。
さらに、ライトユニット２が、ＬＥＤの光源及び樹脂製シートの導光散乱部材６で簡易に構成可能なため、非常に安価に製造することができる。 Moreover, since the front and back surfaces of the electronic paper main body 1 are respectively illuminated by the single light unit 2, the number of members can be reduced, and the entire apparatus can be simplified, thinned, and reduced in cost. That is, it is not necessary to separately provide the light source 8 and the linear light guide member 7 on the front and back surfaces of the electronic paper main body 1, and the single light source 8 and the linear light guide member 7 can be used together.
Furthermore, since the light unit 2 can be easily configured by the light source of the LED and the light guide scattering member 6 made of a resin sheet, it can be manufactured at a very low cost.

次に、本発明に係る表示装置の第２実施形態について、図５を参照して以下に説明する。なお、以下の実施形態の説明において、上記実施形態において説明した同一の構成要素には同一の符号を付し、その説明は省略する。   Next, a second embodiment of the display device according to the present invention will be described below with reference to FIG. Note that, in the following description of the embodiment, the same components described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

第２実施形態と第１実施形態との異なる点は、第１実施形態では、導光散乱部材６が等方性散乱を行う拡散フィルムなどであるのに対し、第２実施形態の表示装置は、図５に示すように、ライトユニット１０の導光散乱部材が、端部から入射された光の導波方向Ａに対して低い散乱特性を有していると共に上記導波方向Ａに対して直交する方向には高い散乱特性を有する異方性散乱部材１１である点である。   The difference between the second embodiment and the first embodiment is that, in the first embodiment, the light guide scattering member 6 is a diffusion film that performs isotropic scattering, whereas the display device of the second embodiment is different from the first embodiment. As shown in FIG. 5, the light guide scattering member of the light unit 10 has low scattering characteristics with respect to the waveguide direction A of the light incident from the end portion, and also with respect to the waveguide direction A. The point is that the anisotropic scattering member 11 has high scattering characteristics in the orthogonal direction.

また、第２実施形態の表示装置は、異方性散乱部材１１としてレンチキュラーレンズフィルムを採用している。このレンチキュラーレンズフィルムは、光の導波方向Ａ（線状導光部材７の延在方向に直交すると共に異方性散乱部材１１に平行な方向）に対して平行する方向に線状に延在した複数の半割円柱状のレンズ群を、表面側に設けた構成を有している。このレンズ群による異方性散乱パターンは、内部の導波方向Ａの光には低散乱パターンであり、それとは９０°直交する方向の光には高散乱パターンとなる。したがって、光の導波方向Ａでは低散乱パターンであるので、導波の阻害を抑制し、光を異方性散乱部材１１全体に導光させることができると共に、導波方向Ａに直交する方向又は傾いた方向の光は表面のレンズ群における高散乱パターンにより、裏面側の電子ペーパー本体１へと出射されて照明光となる。   The display device of the second embodiment employs a lenticular lens film as the anisotropic scattering member 11. This lenticular lens film extends linearly in a direction parallel to the light guiding direction A (direction orthogonal to the extending direction of the linear light guide member 7 and parallel to the anisotropic scattering member 11). The plurality of halved cylindrical lens groups are provided on the surface side. The anisotropic scattering pattern by this lens group is a low scattering pattern for light in the internal waveguide direction A, and a high scattering pattern for light in a direction orthogonal to that by 90 °. Accordingly, since the light scattering direction is a low scattering pattern in the light guiding direction A, it is possible to suppress the inhibition of the guiding and to guide the light to the entire anisotropic scattering member 11 and to orthogonally intersect the guiding direction A. Alternatively, the light in the inclined direction is emitted to the electronic paper main body 1 on the back surface side as illumination light by the high scattering pattern in the lens group on the front surface.

このように第２実施形態では、導光散乱部材として、光の導波方向Ａよりも該導波方向Ａの直交方向における散乱特性が相対的に高い異方性散乱部材１１を採用するので、端部から入射された光を効率的に導光かつ異方散乱させて電子ペーパー本体１の全域を均等に照明可能であると共に、表面からの蛍光灯や太陽光などの光や電子ペーパー本体１から反射した光を効率的に透過させることができる。特に、異方性散乱部材１１としてレンチキュラーレンズフィルムを採用するので、光の導波方向に対して平行する方向に線状に延在した複数の半割円柱状のレンズ群によって効率的な異方性散乱を得ることができる。   As described above, in the second embodiment, as the light guide scattering member, the anisotropic scattering member 11 having relatively high scattering characteristics in the direction orthogonal to the light guide direction A than the light guide direction A is employed. The light incident from the end portion can be efficiently guided and anisotropically scattered to uniformly illuminate the entire area of the electronic paper main body 1, and light such as fluorescent light and sunlight from the surface or the electronic paper main body 1 The light reflected from the light can be transmitted efficiently. In particular, since a lenticular lens film is employed as the anisotropic scattering member 11, an efficient anisotropic effect is obtained by a plurality of half-cylindrical lens groups extending linearly in a direction parallel to the light guiding direction. Sex scattering can be obtained.

なお、本発明は上記各実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることができる。
例えば、上記各実施形態のように本発明は、透過型が構造上困難な電子ペーパーに適用することが好ましいが、液晶表示パネルなどの他の非自発光型である画像表示本体を採用した表示装置に適用しても構わない。液晶表示パネルに適用する場合、一対の液晶表示パネルを、互いに背面を重ねて設置し、これらを挟むように表裏面にそれぞれ導光散乱部材６を配することで、表裏面それぞれに画像情報を表示可能な液晶表示装置を得ることができる。 In addition, this invention is not limited to said each embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, as in the above embodiments, the present invention is preferably applied to electronic paper that is structurally difficult to transmit, but a display that employs another non-self-luminous image display body such as a liquid crystal display panel. You may apply to an apparatus. When applied to a liquid crystal display panel, a pair of liquid crystal display panels are installed with the back surfaces thereof overlapped, and the light guide scattering members 6 are arranged on the front and back surfaces so as to sandwich them so that image information is displayed on each of the front and back surfaces. A displayable liquid crystal display device can be obtained.

本発明に係る表示装置の第１実施形態を示す要部の断面図である。It is sectional drawing of the principal part which shows 1st Embodiment of the display apparatus which concerns on this invention. 第１実施形態において、表示装置を示す側面図である。In 1st Embodiment, it is a side view which shows a display apparatus. 第１実施形態において、電子ペーパー本体を示す平面図及び断面図である。In 1st Embodiment, it is the top view and sectional drawing which show an electronic paper main body. 第１実施形態において、ライトユニットを示す平面図である。It is a top view which shows a light unit in 1st Embodiment. 本発明に係る表示装置の第２実施形態において、ライトユニットを示す平面図、側面図及びＸ−Ｘ線矢視断面図である。In 2nd Embodiment of the display apparatus which concerns on this invention, it is a top view which shows a light unit, a side view, and XX arrow sectional drawing.

符号の説明Explanation of symbols

１…電子ペーパー本体、１ａ…電子ペーパー体、２、１０…ライトユニット、６…導光散乱部材、７…線状導光部材、８…光源、１１…異方性散乱部材   DESCRIPTION OF SYMBOLS 1 ... Electronic paper main body, 1a ... Electronic paper body, 2, 10 ... Light unit, 6 ... Light guide scattering member, 7 ... Linear light guide member, 8 ... Light source, 11 ... Anisotropic scattering member

Claims (1)

表裏面にそれぞれ画像情報を表示可能かつ書き換え可能な画像表示本体と、
該画像表示本体の表裏面のそれぞれを照明するライトユニットと、を備え、
該ライトユニットが、前記画像表示本体の表裏面のそれぞれに配され自身の表裏面から入射された光を透過可能であると共に端部から入射された光を導光し散乱させて少なくとも前記画像表示本体側に出射させ、前記画像表示本体からの反射光を前記画像表示本体側の面に対向する面から出射させる一対の導光散乱部材と、
前記一対の導光散乱部材の端部に配され内部に入射された光を導光し前記一対の導光散乱部材の端部に対向した端面から出射して前記一対の導光散乱部材内に入射させる線状導光部材と、
前記線状導光部材内に光を入射する光源と、を備え、
前記導光散乱部材が、端部から入射された光の導波方向に対して低い散乱特性を有していると共に前記導波方向に対して直交する方向には高い散乱特性を有する異方性散乱部材であり、
前記異方性散乱部材が、光の導波方向に対して平行する方向に線状に延在した複数のレンズ群を設けたレンチキュラーレンズフィルムであり、
前記画像表示本体が、一対の電子ペーパー体を互いに背面側を重ねて設けられ、表裏面にそれぞれ画像情報を書き換え可能かつ無電源状態で表示保持可能な電子ペーパー本体であることを特徴とする表示装置。 An image display body that can display and rewrite image information on the front and back surfaces, and
A light unit that illuminates each of the front and back surfaces of the image display main body,
The light unit is arranged on each of the front and back surfaces of the image display main body and can transmit light incident from the front and back surfaces of the image display main body, and guides and scatters light incident from the end to at least the image display. A pair of light guide scattering members that emit light to the main body side and emit light reflected from the image display main body from a surface facing the surface on the image display main body side ;
The light that is arranged at the end portions of the pair of light guide scattering members and guides the light incident on the inside is emitted from the end surface that faces the end portions of the pair of light guide scattering members, and is emitted into the pair of light guide scattering members. A linear light guide member to be incident;
A light source for entering light into the linear light guide member,
The light guide scattering member has anisotropy having a low scattering characteristic with respect to the waveguide direction of light incident from the end and a high scattering characteristic in a direction perpendicular to the waveguide direction. A scattering member,
The anisotropic scattering member, Ri lenticular lens film der provided with a plurality of lens groups extending linearly in a direction parallel to the light propagation direction,
The display is characterized in that the image display main body is an electronic paper main body provided with a pair of electronic paper bodies overlapped with each other on the back side, and image information can be rewritten on the front and back surfaces and displayed and held in a non-powered state. apparatus.
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