JP2008177106A - Light guide sheet - Google Patents

Light guide sheet Download PDF

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JP2008177106A
JP2008177106A JP2007011066A JP2007011066A JP2008177106A JP 2008177106 A JP2008177106 A JP 2008177106A JP 2007011066 A JP2007011066 A JP 2007011066A JP 2007011066 A JP2007011066 A JP 2007011066A JP 2008177106 A JP2008177106 A JP 2008177106A
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light
color
sheet
guide sheet
light guide
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JP2007011066A
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JP4813383B2 (en
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Heishiro Fudo
平四郎 不藤
Toshimitsu Kuroki
俊光 黒木
Takuro Sugiura
琢郎 杉浦
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Alps Alpine Co Ltd
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Alps Electric Co Ltd
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Priority to JP2007011066A priority Critical patent/JP4813383B2/en
Priority to US11/961,768 priority patent/US20080175022A1/en
Priority to CN2008100012766A priority patent/CN101230970B/en
Publication of JP2008177106A publication Critical patent/JP2008177106A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide sheet capable of emitting light in a uniform color over the whole surface of the sheet regardless of the positions of light sources. <P>SOLUTION: A plurality of light emission regions 11 emitting light from the light sources 2 entered from an end surface A are arranged on a principal surface B of a sheet body 1. The light emission regions 11 are formed by roughening the surface or forming a layer mainly formed of a light reflecting material. By arranging such light emission regions 11, light guided in the sheet body 1 is reflected (diffused) by the light emission regions 11 and emitted to the outside world. The light emission regions 11 contain a color compensation material of a color component of light absorbed by a material constituting the sheet body 1. In this case, a compensation material of blue color (a blue pigment in this case) is mixed in a white material to compensate an absorbed blue component. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、携帯電話のような携帯端末装置の操作領域に配置される導光シートに関する。   The present invention relates to a light guide sheet disposed in an operation region of a mobile terminal device such as a mobile phone.

従来から、表示装置、主に液晶表示装置の照明手段として、液晶表示パネルの背面側から表示面側に向けて光を供給する面状光源、例えばバックライト装置が知られている。このような面状光源としては、例えば、特許文献１に開示されたものがある。この面状光源は、発光ダイオードからの光を導光させる導光板と、導光板からの光により蛍光を発する蛍光物質を有し、凹凸表面を有する透明フィルムとを備えており、発光ダイオードからの光が蛍光物質に照射されて蛍光を発するとともに、この蛍光が凹凸表面を介して外界に出射されるように構成されている。
特開２０００−１２３６２０号公報 2. Description of the Related Art Conventionally, a planar light source that supplies light from the back side of a liquid crystal display panel toward the display surface side, for example, a backlight device, is known as a lighting device for a display device, mainly a liquid crystal display device. An example of such a planar light source is disclosed in Patent Document 1. The planar light source includes a light guide plate that guides light from the light emitting diode, a fluorescent material that emits fluorescence by the light from the light guide plate, and a transparent film having an uneven surface. Light is emitted to the fluorescent material to emit fluorescence, and the fluorescence is emitted to the outside through the uneven surface.
JP 2000-123620 A

近年、上記のような面状光源を利用して携帯電話のような携帯端末装置の操作領域を発光させるために導光シートが開発されている。この導光シートは、携帯端末装置の操作領域上に配置されるので、ユーザの操作を確実に行わせるために可撓性が必要であり、このため、通常プラスチック材料が用いられる。このようにプラスチック材料を用いた導光シートに上記の方法により発光ダイオードの光を導光させると、光における特定の成分が吸収されてしまい、光源の位置によって全面を均一な色で発光させることが難しいという問題がある。   In recent years, a light guide sheet has been developed to emit light in an operation region of a mobile terminal device such as a mobile phone by using the planar light source as described above. Since this light guide sheet is disposed on the operation area of the portable terminal device, it is necessary to have flexibility in order to ensure the user's operation. For this reason, a plastic material is usually used. In this way, when the light of the light emitting diode is guided to the light guide sheet using the plastic material by the above method, a specific component in the light is absorbed, and the entire surface emits light with a uniform color depending on the position of the light source. There is a problem that is difficult.

本発明はかかる点に鑑みてなされたものであり、光源の位置に拘らずシート全面にわたって均一な色で発光させることができる導光シートを提供することを目的とする。   This invention is made | formed in view of this point, and it aims at providing the light guide sheet which can be made to light-emit with a uniform color over the sheet | seat whole surface irrespective of the position of a light source.

本発明の導光シートは、主面及び端面を有すると共に、前記主面上に設けられ、前記端面から入射した光を発光させる複数の発光領域を有するシート本体を備えた導光シートであって、前記発光領域は、前記シート本体を構成する材料で吸収される光の色成分の色の補正材料を含む光反射材料で構成されていることを特徴とする。   The light guide sheet of the present invention is a light guide sheet having a main body and an end face, and a sheet body provided on the main face and having a plurality of light emitting regions that emit light incident from the end face. The light emitting region is made of a light reflecting material including a color correction material for a color component of light absorbed by the material constituting the sheet main body.

この構成によれば、発光領域において光反射材料に補正材料を混合させるので、特定の光成分の吸収を抑えて発光領域における発光の色のばらつきを抑えることができる。その結果、光源の位置に拘らずシート全面にわたって均一な色で発光させることができる。   According to this configuration, since the correction material is mixed with the light reflecting material in the light emitting region, it is possible to suppress the absorption of a specific light component and suppress the variation in the color of light emission in the light emitting region. As a result, light can be emitted in a uniform color over the entire sheet regardless of the position of the light source.

本発明の導光シートにおいては、前記発光領域は、光が入射する端面から離れるにしたがって前記補正材料を多く含むことが好ましい。この構成によれば、より精度良く色のばらつきを抑えることが可能となる。   In the light guide sheet of the present invention, it is preferable that the light emitting region contains a larger amount of the correction material as the distance from the end surface on which light enters. According to this configuration, it is possible to suppress color variations with higher accuracy.

本発明の導光シートにおいては、前記発光領域は、光が入射する端面から離れるにしたがって広くなることが好ましい。この構成によれば、色のばらつきを抑えると共に、明るさのばらつきをも抑えることができる。   In the light guide sheet of the present invention, it is preferable that the light emitting region becomes wider as the distance from the end face on which light is incident. According to this configuration, it is possible to suppress color variations and brightness variations.

本発明の導光シートは、主面及び端面を有すると共に、前記主面上に設けられ、前記端面から入射した光を発光させる複数の発光領域を有するシート本体を備えた導光シートであって、前記発光領域は、前記シート本体を構成する材料で吸収される光の色成分の色の補正材料を含む光反射材料で構成されているので、光源の位置に拘らずシート全面にわたって均一な色で発光させることができる。   The light guide sheet of the present invention is a light guide sheet having a main body and an end face, and a sheet body provided on the main face and having a plurality of light emitting regions that emit light incident from the end face. The light emitting region is made of a light reflecting material including a color correction material for the color component of light absorbed by the material constituting the sheet main body, so that a uniform color can be obtained over the entire sheet regardless of the position of the light source. Can emit light.

以下、本発明の実施の形態について、添付図面を参照して詳細に説明する。
図１は、本発明の実施の形態に係る導光シートを示す図であり、（ａ）は平面図であり、（ｂ）は部分側面図である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a view showing a light guide sheet according to an embodiment of the present invention, in which (a) is a plan view and (b) is a partial side view.

図１に示す導光シートは、可撓性を有する材料、例えばプラスチックで構成されたシート本体１を有する。具体的には、このシート本体は、ポリウレタン樹脂、ＰＥＴ（ポリエチレンテレフタレート）樹脂、ＰＥＮ（ポリエチレンナフタレート）樹脂、シリコーン樹脂、ポリオレフィン樹脂、アクリル樹脂などで構成されている。シート本体１は、端面Ａ及び主面Ｂを有する。シート本体１の端面Ｂには、光源２が配置されている。この光源２としては、発光ダイオード（ＬＥＤ）などを挙げることができる。ここでは、青色ＬＥＤを用いた白色ＬＥＤ光源を用いる。   The light guide sheet shown in FIG. 1 has a sheet body 1 made of a flexible material, for example, plastic. Specifically, the sheet body is made of polyurethane resin, PET (polyethylene terephthalate) resin, PEN (polyethylene naphthalate) resin, silicone resin, polyolefin resin, acrylic resin, or the like. The sheet body 1 has an end surface A and a main surface B. A light source 2 is disposed on the end surface B of the sheet body 1. Examples of the light source 2 include a light emitting diode (LED). Here, a white LED light source using a blue LED is used.

シート本体１の主面Ｂ上には、端面Ａから入射した光源２からの光を発光させる複数の発光領域１１（１１ａ，１１ｂ，１１ｃ）が設けられている。この発光領域１１は、表面を粗らしたり、主に光反射材料（例えば、白色インク）で構成された層を形成することにより設けられている。ここでは、発光領域１１は、光反射材料で構成された層である。このような発光領域１１を設けることにより、図１（ｂ）に示すように、シート本体１中を導光した光が発光領域１１で光反射（光拡散）して外界に出射される。これにより外界から光を視認することができる。なお、シート本体１の主面Ｂにおいて、発光領域１１以外の領域は非発光領域１２であり、この領域からは光を視認できない。   On the main surface B of the sheet body 1, a plurality of light emitting regions 11 (11a, 11b, 11c) for emitting light from the light source 2 incident from the end surface A are provided. The light emitting region 11 is provided by roughening the surface or forming a layer mainly composed of a light reflecting material (for example, white ink). Here, the light emitting region 11 is a layer made of a light reflecting material. By providing such a light emitting region 11, as shown in FIG. 1B, the light guided through the sheet body 1 is reflected (light diffused) by the light emitting region 11 and emitted to the outside. Thereby, light can be visually recognized from the outside. In addition, in the main surface B of the sheet body 1, a region other than the light emitting region 11 is a non-light emitting region 12, and light cannot be visually recognized from this region.

発光領域１１は、シート本体１を構成する材料で吸収される光の色成分の色の補正材料を含む。上述したシート本体１を構成する材料は、いずれも４００ｎｍ〜５００ｎｍの間の波長の光（青色の光成分）を吸収して黄変する性質を有しているので、この場合においては、補正材料としては青色の補正材料を用いる。補正材料としては、インクや顔料などを挙げることができる。この場合、発光領域１１は、光反射材料に補正材料を混合した混合材料で構成された層を印刷などにより形成しても良く、光反射材料で構成された層と補正材料で構成された層とを個別に印刷などにより形成しても良い。   The light emitting region 11 includes a color correction material for the color component of light absorbed by the material constituting the sheet body 1. Since the materials constituting the sheet main body 1 described above have a property of yellowing by absorbing light having a wavelength between 400 nm and 500 nm (blue light component), in this case, the correction material For this, a blue correction material is used. Examples of the correction material include ink and pigment. In this case, the light emitting region 11 may be formed by printing a layer made of a mixed material in which a light reflecting material is mixed with a correction material. A layer made of a light reflective material and a layer made of a correction material And may be formed individually by printing or the like.

上記のようにシート本体１が特定の光成分を吸収する場合、光源２からの距離に応じて光成分が吸収される程度が異なる。すなわち、図１（ａ）において、光源２からの距離に応じて光成分が吸収される程度が異なる。したがって、発光領域１１ａ，１１ｂ，１１ｃでは光成分が吸収される程度が異なる。その結果、発光領域による発光の色合いが異なり、シート本体全面にわたって均一な色で発光させることができない。   As described above, when the sheet main body 1 absorbs a specific light component, the degree to which the light component is absorbed depends on the distance from the light source 2. That is, in FIG. 1A, the degree to which the light component is absorbed differs depending on the distance from the light source 2. Therefore, the light-emitting regions 11a, 11b, and 11c have different degrees of absorption of light components. As a result, the color of light emission by the light emitting region is different, and light cannot be emitted in a uniform color over the entire surface of the sheet body.

本発明のように、発光領域１１において光反射材料に補正材料を混合させることにより、ここでは吸収された青色成分を補うように、白色材料に青色の補正材料（ここでは青色顔料）を混合させることにより、青色成分の吸収を抑えて発光領域における発光の色のばらつきを抑えることができる。光反射材料に対する補正材料の含有量は、０．００１重量％〜２重量％であることが好ましい。   As in the present invention, the correction material is mixed with the light reflecting material in the light emitting region 11 so that the white material is mixed with the blue correction material (here, the blue pigment) so as to supplement the absorbed blue component. As a result, the absorption of the blue component can be suppressed, and the variation in emission color in the light emitting region can be suppressed. The content of the correction material with respect to the light reflecting material is preferably 0.001% by weight to 2% by weight.

ここで、光源２からの距離と、その場所で発光された光の色度との間の関係を調べると、図２に示すようになる。すなわち、色度表におけるｘ成分及びｙ成分のいずれもが距離の増加に伴って増加した。これは、光源２からの距離に応じて、図３に示す色度表において色度が矢印方向に移動する、すなわち色度が黄色に移行することを意味する。また、光反射材料に対する補正材料（青色顔料）の含有量と、発光された光の色度との間の関係を調べると、図４に示すようになる。すなわち、光反射材料に対する補正材料の含有量が増加するにしたがって、色度表におけるｘ成分及びｙ成分のいずれもが減少した。これは、補正材料の含有量の増加に応じて、図３に示す色度表において色度が矢印方向と反対方向に移動する、すなわち色度が白色に移行することを意味する。図４から、ｘ成分については元の色に戻すために０．１８重量％／６０ｍｍの顔料が必要であることが分かり、ｙ成分については元の色に戻すために０．３重量％／６０ｍｍの顔料が必要であることが分かる。したがって、０．００３重量％〜０．００５重量％／ｍｍの補正材料を加えることにより色補正を行うことが可能となる。   Here, when the relationship between the distance from the light source 2 and the chromaticity of the light emitted at the place is examined, it is as shown in FIG. That is, both the x component and the y component in the chromaticity table increased as the distance increased. This means that the chromaticity moves in the direction of the arrow in the chromaticity table shown in FIG. 3 according to the distance from the light source 2, that is, the chromaticity shifts to yellow. Further, when the relationship between the content of the correction material (blue pigment) with respect to the light reflecting material and the chromaticity of the emitted light is examined, it is as shown in FIG. That is, as the content of the correction material with respect to the light reflecting material increased, both the x component and the y component in the chromaticity table decreased. This means that the chromaticity moves in the direction opposite to the arrow direction in the chromaticity table shown in FIG. 3, that is, the chromaticity shifts to white as the content of the correction material increases. FIG. 4 shows that 0.18% by weight / 60 mm of pigment is required for the x component to return to the original color, and 0.3% by weight / 60 mm for the y component to return to the original color. It can be seen that this pigment is necessary. Therefore, it is possible to perform color correction by adding a correction material of 0.003% to 0.005% by weight / mm.

このため、発光領域１１は、光が入射する端面から、すなわち光源２から離れるにしたがって補正材料を多く含むように設定することが好ましい。具体的には、図１（ａ）において、発光領域１１ａ、発光領域１１ｂ、発光領域１１ｃの順に補正材料を多く含むように設定する。これにより、より精度良く色のばらつきを抑えることが可能となる。   For this reason, it is preferable that the light emitting region 11 is set so as to include more correction material as it moves away from the end face where the light enters, that is, away from the light source 2. Specifically, in FIG. 1A, the light-emitting region 11a, the light-emitting region 11b, and the light-emitting region 11c are set so as to include a large amount of correction material in this order. This makes it possible to suppress color variations with higher accuracy.

発光領域１１において、図５（ａ）に示すように、光反射材料１１１中に補正材料１１２を含む態様である場合、すなわち光反射材料１１１に補正材料１１２を混合した混合材料で発光領域１１を形成した場合、補正材料を多く含める、すなわち補正材料の割合を高めるためには、その体積を多くすればよいので、図５（ｂ）に示すように、補正材料１１２の量を多くすれば良い。また、図５（ｃ）に示すように、光反射材料層１１３と補正材料層１１４を個別に形成した場合には、補正材料を多く含める、すなわち補正材料の割合を高めるためには、補正材料層１１４の面積や体積を多くする。例えば、スクリーン印刷で発光領域を形成する場合は、光源からの距離に対して補正材料層１１４の面積を増やしたスクリーン印刷マスクを作成することで、光反射材料層１１３のスクリーン印刷を含めて２回の印刷工程で全ての場所で均一な色の導光シートを作製することができる。さらに、図５（ｄ）に示すように、光反射材料のドット１１５と補正材料のドット１１６とを別々に形成しても良い。   As shown in FIG. 5A, in the light emitting region 11, when the light reflecting material 111 includes the correction material 112, that is, the light emitting region 11 is made of a mixed material in which the light reflecting material 111 is mixed with the correction material 112. When formed, in order to include a large amount of the correction material, that is, to increase the ratio of the correction material, the volume may be increased. Therefore, as shown in FIG. 5B, the amount of the correction material 112 may be increased. . As shown in FIG. 5C, when the light reflecting material layer 113 and the correction material layer 114 are individually formed, the correction material is included in order to include a large amount of the correction material, that is, to increase the ratio of the correction material. The area and volume of the layer 114 are increased. For example, in the case where the light emitting region is formed by screen printing, a screen printing mask in which the area of the correction material layer 114 is increased with respect to the distance from the light source is created, thereby including the screen printing of the light reflecting material layer 113. A light guide sheet having a uniform color can be produced at all locations in a single printing process. Further, as shown in FIG. 5D, the light reflecting material dots 115 and the correction material dots 116 may be formed separately.

また、発光領域１１は、光が入射する端面から、すなわち光源２から離れるにしたがって広くなるように設定することが好ましい。具体的には、図６に示すように、発光領域１１ａ、発光領域１１ｂ、発光領域１１ｃの順に広くするように設定する。これにより、より精度良く色のばらつきを抑えることが可能となる。これにより、光源２から距離が離れることによる明るさの低下を補って、色のばらつきを抑えると共に、明るさのばらつきをも抑えることができる。   The light emitting region 11 is preferably set so as to become wider from the end face where the light is incident, that is, as the distance from the light source 2 increases. Specifically, as shown in FIG. 6, the light emitting area 11a, the light emitting area 11b, and the light emitting area 11c are set so as to increase in order. This makes it possible to suppress color variations with higher accuracy. Accordingly, it is possible to compensate for a decrease in brightness due to the distance from the light source 2 to suppress color variations and to suppress brightness variations.

次に、本発明の効果を明確にするために行った実施例について説明する。
ポリウレタン樹脂で構成されたシート本体の主面上に、白インクに青色顔料を０．１重量％、０．２５重量％で混合した混合インクをスクリーン印刷して発光領域を形成して、それぞれ実施例１，２の導光シートを作製した。また、ポリウレタン樹脂で構成されたシート本体の主面上に、白インクをスクリーン印刷して発光領域を形成して比較例の導光シートを作製した。 Next, examples performed for clarifying the effects of the present invention will be described.
On the main surface of the sheet body made of polyurethane resin, light-emitting areas are formed by screen printing mixed ink in which blue pigment is mixed with white ink at 0.1 wt% and 0.25 wt%, respectively. The light guide sheets of Examples 1 and 2 were produced. Moreover, on the main surface of the sheet main body made of polyurethane resin, white ink was screen-printed to form a light emitting region to produce a comparative light guide sheet.

このとき、白インクとしては、Ｒ−５８０（石原産業製）４９．９体積％、バイロン２００（東洋紡製）２７．８体積％、バイロン５６０（東洋紡製）２２．４体積％で配合してなるものを用い、青色顔料としてはＬＩＯＮＥＬ ＢＬＵＥ ＦＧ−７３５０（TOYO INK製）を用いた。   At this time, as white ink, R-580 (made by Ishihara Sangyo) 49.9% by volume, Byron 200 (made by Toyobo) 27.8% by volume, Byron 560 (made by Toyobo) 22.4% by volume are blended. The blue pigment used was LIONEL BLUE FG-7350 (manufactured by TOYO INK).

上記のようにして得られた導光シートについて、全面における色調変化（ｘ成分）を調べた。色調変化は、トプコン社製ＳＲ−３及びハイランド社製Risa-Colorを用い、視野角１°、距離５００ｍｍの条件で求めた。その結果、実施例１，２の導光シートは０．００７であり、色のばらつきが抑えられていたが、比較例の導光シートは０．０２であり、色のばらつきが大きかった。   The light guide sheet obtained as described above was examined for color tone change (x component) on the entire surface. The change in color tone was obtained under the conditions of a viewing angle of 1 ° and a distance of 500 mm using Topcon SR-3 and Highland Risa-Color. As a result, the light guide sheets of Examples 1 and 2 were 0.007 and the color variation was suppressed, but the light guide sheet of the comparative example was 0.02 and the color variation was large.

本発明は上記実施の形態に限定されず、種々変更して実施することができる。例えば、上記実施の形態においては、光の青成分がシート本体に吸収される場合について説明しているが、本発明はこれに限定されず、光の他の色成分がシート本体に吸収される場合についても同様に適用することができる。また、導光シートにおける発光領域の寸法、形状や、光反射材料、補正材料などについては本発明の効果を逸脱しない範囲で適宜設定することができる。その他、本発明の目的の範囲を逸脱しない限りにおいて適宜変更することが可能である。   The present invention is not limited to the above embodiment, and can be implemented with various modifications. For example, in the above embodiment, the case where the blue component of light is absorbed by the sheet body is described, but the present invention is not limited to this, and other color components of light are absorbed by the sheet body. The same applies to the case. In addition, the size and shape of the light emitting region in the light guide sheet, the light reflecting material, the correction material, and the like can be set as appropriate without departing from the effects of the present invention. Other modifications may be made as appropriate without departing from the scope of the object of the present invention.

本発明の実施の形態に係る導光シートを示す図であり、（ａ）は平面図であり、（ｂ）は部分側面図である。It is a figure which shows the light guide sheet which concerns on embodiment of this invention, (a) is a top view, (b) is a partial side view. 色度と光源からの距離との間の関係を示す図である。It is a figure which shows the relationship between chromaticity and the distance from a light source. 図２に示す色度の変化を説明するための色度表を示す図である。It is a figure which shows the chromaticity table for demonstrating the change of chromaticity shown in FIG. 色度と光反射材料における補正材料の含有量との間の関係を示す図である。It is a figure which shows the relationship between chromaticity and content of the correction material in a light reflection material. （ａ）〜（ｄ）は、発光領域における光反射材料と補正材料との間の割合を示す図である。(A)-(d) is a figure which shows the ratio between the light reflection material and correction | amendment material in a light emission area | region. 本発明の実施の形態に係る導光シートの他の例を示す図である。It is a figure which shows the other example of the light guide sheet which concerns on embodiment of this invention.

符号の説明Explanation of symbols

１ シート本体
２ 光源
１１ａ，１１ｂ，１１ｃ 発光領域
１２ 非発光領域
１１１ 光反射材料
１１２ 補正材料
１１３ 光反射材料層
１１４ 補正材料層
１１５ 光反射材料のドット
１１６ 補正材料のドット DESCRIPTION OF SYMBOLS 1 Sheet | seat body 2 Light source 11a, 11b, 11c Light emission area | region 12 Non-light emission area | region 111 Light reflection material 112 Correction material 113 Light reflection material layer 114 Correction material layer 115 Light reflection material dot 116 Correction material dot

Claims (3)

主面及び端面を有すると共に、前記主面上に設けられ、前記端面から入射した光を発光させる複数の発光領域を有するシート本体を備えた導光シートであって、前記発光領域は、前記シート本体を構成する材料で吸収される光の色成分の色の補正材料を含む光反射材料で構成されていることを特徴とする導光シート。   A light guide sheet having a main surface and an end surface, and a light guide sheet provided on the main surface and having a plurality of light emitting regions that emit light incident from the end surface, wherein the light emitting region is the sheet. A light guide sheet comprising a light reflecting material including a color correction material of a color component of light absorbed by a material constituting the main body. 前記発光領域は、光が入射する端面から離れるにしたがって前記補正材料を多く含むことを特徴とする請求項１記載の導光シート。   2. The light guide sheet according to claim 1, wherein the light emitting region contains a larger amount of the correction material as it is separated from an end surface on which light is incident. 前記発光領域は、光が入射する端面から離れるにしたがって広くなることを特徴とする請求項１又は請求項２記載の導光シート。   The light guide sheet according to claim 1, wherein the light emitting region becomes wider as the distance from the end face on which the light is incident is increased.
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