JP2011187399A - Lighting system and electro-optical device - Google Patents

Lighting system and electro-optical device Download PDF

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JP2011187399A
JP2011187399A JP2010054083A JP2010054083A JP2011187399A JP 2011187399 A JP2011187399 A JP 2011187399A JP 2010054083 A JP2010054083 A JP 2010054083A JP 2010054083 A JP2010054083 A JP 2010054083A JP 2011187399 A JP2011187399 A JP 2011187399A
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light
guide plate
light guide
roughened
reflective
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Taketoshi Masamoto
武寿 政本
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Sony Corp
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Sony Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To simplify a manufacturing process of a lighting system in which the emitted light from a light guide plate to the rear side can be utilized effectively. <P>SOLUTION: The lighting system 20 includes a light guide plate 22 and a housing body 30. The light guide plate 22 is a light-transmitting plate member which includes an outgoing surface 221 opposed to a display body 10, a rear surface 223 on the opposite side to the outgoing surface 221, and an incident surface 225 facing a light source 28. The housing bodies 30 are formed of a light-reflecting material and houses the light guide plate 22. The facing surface to the rear surface 223 of the light guide plate 22 among the housing bodies 30 is a reflection surface 36 which reflects the outgoing light from the rear surface 223. The reflecting surface 36 is formed into a roughened surface, in an appropriate way. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、液晶装置等の電気光学装置に好適な照明装置の構造に関する。   The present invention relates to a structure of an illumination device suitable for an electro-optical device such as a liquid crystal device.

図11に示すように、側端面からの入射光を出射面922に導く導光板92を収容体(筐体)94に収容した平板型の照明装置(面光源装置)が例えば特許文献1に開示されている。収容体94のうち導光板92との対向面には、導光板92から出射面922とは反対側に出射した光を反射する反射膜96が、例えば光反射性の金属材料の蒸着で形成される。図11の構成によれば、導光板92や収容体94とは別個の反射板が不要であるから、照明装置の部品点数が削減されるという利点がある。   As shown in FIG. 11, for example, Patent Document 1 discloses a flat-type illumination device (surface light source device) in which a light guide plate 92 that guides incident light from a side end surface to an output surface 922 is accommodated in an accommodating body (housing) 94. Has been. A reflective film 96 that reflects light emitted from the light guide plate 92 to the opposite side of the light emission surface 922 is formed on the surface of the container 94 facing the light guide plate 92 by, for example, vapor deposition of a light reflective metal material. The According to the configuration of FIG. 11, a reflector separate from the light guide plate 92 and the container 94 is not necessary, and thus there is an advantage that the number of parts of the lighting device is reduced.

特開2004−213998号公報JP 2004-213998 A

しかし、特許文献1の技術では、収容体94に反射膜96を形成する工程が必要であるから、照明装置の製造工程が充分に簡素化されないという問題がある。また、導光板92から背面側への出射光は、反射膜96の平坦な表面で正反射するから、反射膜96での反射光を充分に有効に利用できない場合がある。以上の事情を考慮して、本発明は、導光板から背面側への出射光を有効に利用できる照明装置の製造工程を簡素化することを目的とする。   However, since the technique of Patent Document 1 requires a process of forming the reflective film 96 on the container 94, there is a problem that the manufacturing process of the lighting device is not sufficiently simplified. In addition, since the light emitted from the light guide plate 92 to the back side is regularly reflected by the flat surface of the reflective film 96, the reflected light from the reflective film 96 may not be used sufficiently effectively. In view of the above circumstances, an object of the present invention is to simplify a manufacturing process of an illumination device that can effectively use light emitted from the light guide plate to the back side.

以上の課題を解決するために、本発明の電気光学装置は、入射面と第1面(例えば図1の出射面221)と第1面の反対側の第2面(例えば図1の後背面223)とを含み、入射面に対する入射光を第1面に導く導光板と、入射面に光を照射する光源と、光反射性の材料で形成されて導光板を収容する収容体とを具備し、収容体のうち導光板の第2面との対向面は、粗面化された領域を含み、第2面からの出射光を反射する反射面である。以上の構成によれば、光反射性の材料で形成された収容体の反射面にて導光板の後背面からの出射光が反射されるから、導光板の背面側に反射板を配置した構成や、収容体の表面に例えば蒸着で反射膜を形成した構成(特許文献1)は不要である。したがって、照明装置の製造工程が簡素化されるという利点がある。また、反射光が適度に散乱するように反射面が粗面化されるから、反射面の全域が鏡面である構成と比較して導光板から背面側への出射光を有効に利用することが可能である。   In order to solve the above problems, the electro-optical device according to the present invention includes an incident surface, a first surface (for example, the exit surface 221 in FIG. 1), and a second surface opposite to the first surface (for example, the rear back surface in FIG. 1). 223), a light guide plate that guides incident light on the incident surface to the first surface, a light source that irradiates the incident surface with light, and a housing that is formed of a light-reflective material and accommodates the light guide plate. In addition, the surface of the container that faces the second surface of the light guide plate is a reflective surface that includes a roughened region and reflects light emitted from the second surface. According to the above configuration, since the emitted light from the rear back surface of the light guide plate is reflected by the reflective surface of the container formed of a light reflective material, the configuration in which the reflective plate is arranged on the back side of the light guide plate Or the structure (patent document 1) which formed the reflecting film in the surface of the container, for example by vapor deposition is unnecessary. Therefore, there is an advantage that the manufacturing process of the lighting device is simplified. In addition, since the reflecting surface is roughened so that the reflected light is appropriately scattered, it is possible to effectively use the emitted light from the light guide plate to the back side compared to a configuration in which the entire reflecting surface is a mirror surface. Is possible.

なお、反射面のうち粗面化される領域は任意である。例えば、反射面の全域を粗面化した構成や、反射面を部分的に粗面化した構成が採用され得る。また、粗面化された領域(粗面領域)の表面粗さは適宜に選定される。例えば、粗面領域の表面粗さを反射面の面内で均一化した構成や、粗面領域の表面粗さを反射面の面内で相違させた構成が採用される。   In addition, the area | region roughened among reflection surfaces is arbitrary. For example, a configuration in which the entire reflection surface is roughened or a configuration in which the reflection surface is partially roughened may be employed. The surface roughness of the roughened region (rough surface region) is appropriately selected. For example, a configuration in which the surface roughness of the rough surface region is made uniform within the surface of the reflection surface, or a configuration in which the surface roughness of the rough surface region is made different within the surface of the reflection surface is employed.

本発明の好適な態様において、収容体は、反射面を含む平板状の底面部と、導光板の側端面に対向するように底面部の周縁から突出する側面部とを含み、側面部の内周面は、粗面化された領域を含む。以上の態様においては、導光板の側端面からの出射光が適度に散乱した状態で側面部の内周面にて反射されるから、導光板からの出射光を有効に利用するという効果は格別に顕著となる。   In a preferred aspect of the present invention, the container includes a flat bottom surface portion including a reflection surface, and a side surface portion protruding from the periphery of the bottom surface portion so as to face the side end surface of the light guide plate. The peripheral surface includes a roughened region. In the above aspect, since the light emitted from the side end surface of the light guide plate is reflected by the inner peripheral surface of the side surface part in a moderately scattered state, the effect of effectively using the light emitted from the light guide plate is exceptional. Becomes prominent.

本発明に係る電気光学装置は、以上の各態様に係る照明装置と、照明装置の第1面からの出射光の透過率が変化する複数の電気光学素子が面状に配列された表示体とを具備する。以上の電気光学装置によれば、本発明の照明装置と同様の作用および効果が実現される。本発明の電気光学装置は、例えば携帯型情報端末(例えば携帯電話機)等の各種の電子機器に表示機器として採用され得る。   The electro-optical device according to the present invention includes a lighting device according to each of the above aspects, a display body in which a plurality of electro-optical elements that change the transmittance of emitted light from the first surface of the lighting device are arranged in a planar shape, It comprises. According to the above electro-optical device, the same operation and effect as the illumination device of the present invention are realized. The electro-optical device of the present invention can be employed as a display device in various electronic devices such as a portable information terminal (for example, a mobile phone).

本発明の第1実施形態に係る電気光学装置の分解斜視図である。1 is an exploded perspective view of an electro-optical device according to a first embodiment of the invention. 収容体の底面部の断面図である。It is sectional drawing of the bottom face part of a container. 反射面の粗面化の効果を説明する図表である。It is a graph explaining the effect of the roughening of a reflective surface. 第2実施形態における反射面の平面図である。It is a top view of the reflective surface in 2nd Embodiment. 第3実施形態における反射面の平面図である。It is a top view of the reflective surface in 3rd Embodiment. 第4実施形態における収容体の斜視図である。It is a perspective view of the container in a 4th embodiment. 集光板の内部での光路を説明するための断面図である。It is sectional drawing for demonstrating the optical path in the inside of a light-condensing plate. 電子機器の形態(パーソナルコンピュータ)を示す斜視図である。It is a perspective view which shows the form (personal computer) of an electronic device. 電子機器の形態(携帯電話機)を示す斜視図である。It is a perspective view which shows the form (cellular phone) of an electronic device. 電子機器の形態(携帯情報端末)を示す斜視図である。It is a perspective view which shows the form (mobile information terminal) of an electronic device. 特許文献1に開示された電気光学装置の分解斜視図である。10 is an exploded perspective view of an electro-optical device disclosed in Patent Document 1. FIG.

<A:第1実施形態>
図1は、本発明の第1実施形態に係る電気光学装置100の分解斜視図である。電気光学装置100は、画像を表示する平板型の表示機器であり、図1に示すように、表示体10と照明装置20とを含んで構成される。なお、以下の説明では、電気光学装置100を構成する板状または層状の各要素の板面(主面)に平行で相互に直交するX方向およびY方向と、X-Y平面に垂直なZ方向とを便宜的に想定する。電気光学装置100の内部の任意の位置からみてZ方向の正側が前面側(電気光学装置100の表示画像を視認する利用者にとって手前側)に相当し、当該位置からみてZ方向の負側が背面側(利用者にとって奥側)に相当する。
<A: First Embodiment>
FIG. 1 is an exploded perspective view of an electro-optical device 100 according to the first embodiment of the present invention. The electro-optical device 100 is a flat display device that displays an image, and includes a display body 10 and an illumination device 20 as shown in FIG. In the following description, the X direction and the Y direction that are parallel to the plate surfaces (main surfaces) of the plate-like or layer-like elements constituting the electro-optical device 100 and orthogonal to each other, and Z perpendicular to the XY plane are used. Directions are assumed for convenience. The positive side in the Z direction when viewed from any position inside the electro-optical device 100 corresponds to the front side (the front side for the user viewing the display image of the electro-optical device 100), and the negative side in the Z direction is the rear side when viewed from the position. It corresponds to the side (the back side for the user).

表示体10は、相対向する状態で接合された第1基板12と第2基板14との間隙内に液晶(図示略)を封止した構造の液晶パネルである。第1基板12および第2基板14は、例えば光透過性を有する硝子製の板状部材である。電極間に液晶を介在させた複数の液晶素子(画素)Eが、図1に示すようにX方向およびY方向にわたって表示領域D内に行列状に配列される。なお、表示体10の両面に貼付される偏光板等の要素の図示は便宜的に省略されている。   The display 10 is a liquid crystal panel having a structure in which liquid crystal (not shown) is sealed in a gap between the first substrate 12 and the second substrate 14 bonded in a state of facing each other. The first substrate 12 and the second substrate 14 are, for example, glass plate members having optical transparency. A plurality of liquid crystal elements (pixels) E having liquid crystal interposed between the electrodes are arranged in a matrix in the display region D over the X direction and the Y direction as shown in FIG. In addition, illustration of elements, such as a polarizing plate stuck on both surfaces of the display body 10, is abbreviate | omitted for convenience.

照明装置20は、表示体10の背面側に配置されて表示領域Dに光を照射する平板型の面光源(バックライト)である。図1に示すように、照明装置20は、導光板22と拡散板24と集光板26と複数の光源28とを収容体30に収容した構造である。照明装置20からの出射光の透過率を液晶素子E毎に可変に制御することで表示領域Dに所望の画像が表示される。   The illumination device 20 is a flat surface light source (backlight) that is disposed on the back side of the display body 10 and irradiates the display region D with light. As shown in FIG. 1, the lighting device 20 has a structure in which a light guide plate 22, a diffusion plate 24, a light collector 26, and a plurality of light sources 28 are accommodated in a housing 30. A desired image is displayed in the display area D by variably controlling the transmittance of the emitted light from the illumination device 20 for each liquid crystal element E.

導光板22は、表示体10の第2基板14に対向する前面側の表面(以下「出射面」という)221と、出射面221とは反対側に位置する背面側の表面(以下「後背面」という)223とをX-Y平面に平行な主面とする板状部材である。複数の光源28の各々は、導光板22のひとつの側端面(以下「入射面」という)225に対向するように配置されて入射面225に光を照射する。例えばLED(Light Emitting Diode)等の発光素子が光源として採用され得る。導光板22は、光透過性の材料(例えばアクリル樹脂)で形成され、各光源28から入射面225に入射する光を出射面221の全域に導いて表示領域Dに略均等に出射する。   The light guide plate 22 includes a front-side surface (hereinafter referred to as “emission surface”) 221 facing the second substrate 14 of the display body 10 and a rear-side surface (hereinafter referred to as “rear rear surface”) opposite to the emission surface 221. Is a plate-like member having a main surface parallel to the XY plane. Each of the plurality of light sources 28 is arranged to face one side end surface (hereinafter referred to as “incident surface”) 225 of the light guide plate 22 and irradiates the incident surface 225 with light. For example, a light emitting element such as an LED (Light Emitting Diode) may be employed as the light source. The light guide plate 22 is formed of a light-transmitting material (for example, acrylic resin), guides light incident on the incident surface 225 from each light source 28 to the entire area of the emission surface 221 and emits the light to the display area D substantially evenly.

拡散板24は、導光板22の出射面221に設置され、出射面221からの出射光を適度に散乱させる。集光板(プリズムシート)26は、拡散板24の前面側に配置され、拡散板24からの出射光を表示体10に向けて集光する。図1に示すように、表示体10は、両面テープ等の接着層50を利用して照明装置20(集光板26の前面側の表面)に接合される。接着層50は、表示領域Dに対応して開口する矩形枠状に形成された遮光性の膜体である。   The diffusion plate 24 is installed on the emission surface 221 of the light guide plate 22 and appropriately scatters the light emitted from the emission surface 221. The light collecting plate (prism sheet) 26 is disposed on the front surface side of the diffusion plate 24, and condenses the emitted light from the diffusion plate 24 toward the display body 10. As shown in FIG. 1, the display body 10 is bonded to the lighting device 20 (the front surface of the light collector 26) using an adhesive layer 50 such as a double-sided tape. The adhesive layer 50 is a light-shielding film body formed in a rectangular frame shape that opens corresponding to the display area D.

図1に示すように、収容体30は、略矩形の平板状の底面部32と、底面部32の周縁から前面側に突出する矩形枠状の側面部34とを含んで構成される。導光板22が収容体30に収容された状態では、導光板22の後背面223と底面部32の前面側の表面(以下「反射面」という)36とが対向(接触)し、かつ、導光板22の側端面(入射面225を含む)と側面部34の内周面とが導光板22の全周にわたって対向する。以上のように導光板22の後背面223と底面部32の反射面36とは直接に対向する。すなわち、例えば反射板等の要素は導光板22と底面部32との間に介在しない。   As shown in FIG. 1, the container 30 includes a substantially rectangular flat plate-like bottom surface portion 32 and a rectangular frame-shaped side surface portion 34 that protrudes from the periphery of the bottom surface portion 32 to the front surface side. In a state where the light guide plate 22 is housed in the housing 30, the rear back surface 223 of the light guide plate 22 and the front surface side surface 36 (hereinafter referred to as “reflecting surface”) 36 of the bottom surface portion 32 face (contact) and are guided. The side end surface (including the incident surface 225) of the optical plate 22 and the inner peripheral surface of the side surface portion 34 face each other over the entire circumference of the light guide plate 22. As described above, the rear back surface 223 of the light guide plate 22 and the reflection surface 36 of the bottom surface portion 32 directly face each other. That is, for example, an element such as a reflection plate is not interposed between the light guide plate 22 and the bottom surface portion 32.

収容体30は、光反射性の材料で一体に形成される。具体的には、収容体30は、白色の樹脂材料(例えばポリカーボネート)の射出成形で作成される。したがって、導光板22の後背面223から背面側に出射する光は、収容体30の底面部32の反射面36にて反射して後背面223から導光板22に入射する。以上の構成によれば、導光板22から背面側に出射した光も画像の表示に有効に利用できるという利点がある。   The container 30 is integrally formed of a light reflective material. Specifically, the container 30 is made by injection molding of a white resin material (for example, polycarbonate). Therefore, the light emitted from the rear back surface 223 to the back surface side of the light guide plate 22 is reflected by the reflection surface 36 of the bottom surface portion 32 of the container 30 and enters the light guide plate 22 from the rear back surface 223. According to the above configuration, there is an advantage that light emitted from the light guide plate 22 to the back side can also be effectively used for image display.

図2は、反射面36の断面図である。図2に示すように、反射面36は、その全域にわたって、多数の微細な凹凸が形成された粗面となっている。図1では粗面が便宜的に網掛で表現されている。粗面の表面粗さは、反射面36の面内で略一定である。反射面36の粗面化の方法は任意であるが、例えば、反射面36の形成面が研磨材やヤスリで研磨(研削)された金型を使用して収容体30を成形する方法が好適に採用され得る。以上のように反射面36を粗面化した構成によれば、図2に矢印で図示したように、反射面36の表面における反射光が適度に散乱する。したがって、反射面36を鏡面状とした構成(図2に破線の矢印で示すように導光板22の後背面223からの出射光が反射面36にて正反射する構成)と比較すると、導光板22の後背面223に対する入射光(反射光)について、後背面223に対する入射角が小さい成分(後背面223に対して垂直に近い角度で入射する成分)を増加させることが可能である。すなわち、出射面221から表示体10に供給される光量(照明装置20の輝度)を充分に確保することが可能である。   FIG. 2 is a cross-sectional view of the reflecting surface 36. As shown in FIG. 2, the reflecting surface 36 is a rough surface on which a large number of fine irregularities are formed over the entire area. In FIG. 1, the rough surface is represented by shading for convenience. The surface roughness of the rough surface is substantially constant within the surface of the reflecting surface 36. The method of roughening the reflecting surface 36 is arbitrary, but for example, a method of forming the container 30 using a mold in which the forming surface of the reflecting surface 36 is polished (ground) with an abrasive or a file is suitable. Can be adopted. As described above, according to the configuration in which the reflecting surface 36 is roughened, the reflected light on the surface of the reflecting surface 36 is appropriately scattered as illustrated by arrows in FIG. Therefore, the light guide plate is compared with a configuration in which the reflection surface 36 is mirror-like (a configuration in which light emitted from the rear and rear surfaces 223 of the light guide plate 22 is regularly reflected by the reflection surface 36 as indicated by broken arrows in FIG. 2). In the incident light (reflected light) 22 to the rear back surface 223, it is possible to increase a component having a small incident angle with respect to the rear back surface 223 (component incident at an angle close to perpendicular to the rear back surface 223). That is, it is possible to sufficiently secure the amount of light (the luminance of the lighting device 20) supplied from the emission surface 221 to the display body 10.

図3は、算術平均粗さRa(JIS B0601-1994)が1.0〜1.2の範囲内に収まるように反射面36を粗面化した場合の照明装置20の輝度を示す図表である。図3では、反射面36を粗面化しない場合(算術平均粗さRa=0.1)の輝度を基準(100)として正規化した輝度の測定値が、拡散板24の積層枚数を変化させた複数の場合の各々について図示されている。反射面36を粗面化することで輝度が1〜3%ほど増加することが図3から把握される。具体的には、照明装置20の輝度を増加させるには、算術平均粗さRaが0.5以上となるように反射面36を粗面化した構成が好適であり、更に好適には、算術平均粗さRaが1.0以上(更には1.2以上)となるように反射面36が粗面化される。   FIG. 3 is a chart showing the luminance of the lighting device 20 when the reflecting surface 36 is roughened so that the arithmetic average roughness Ra (JIS B0601-1994) falls within the range of 1.0 to 1.2. In FIG. 3, the measured luminance values normalized with the luminance of the reflective surface 36 not roughened (arithmetic average roughness Ra = 0.1) as a reference (100) are a plurality of values obtained by changing the number of laminated diffusion plates 24. Each of the cases is illustrated. It can be seen from FIG. 3 that the luminance increases by 1 to 3% by roughening the reflecting surface 36. Specifically, in order to increase the luminance of the lighting device 20, a configuration in which the reflecting surface 36 is roughened so that the arithmetic average roughness Ra is 0.5 or more is preferable, and more preferably the arithmetic average roughness. The reflecting surface 36 is roughened so that the thickness Ra is 1.0 or more (further 1.2 or more).

以上に説明したように、本実施形態においては、光反射性の材料で形成された収容体30の反射面36にて導光板22の後背面223からの出射光が反射されるから、導光板22の背面側に反射板を配置した構成や、収容体94の表面に例えば蒸着で反射膜96を形成した特許文献1の構成(図11)は不要である。したがって、照明装置20の製造工程が簡素化されるという利点がある。また、反射光が適度に散乱するように反射面36が粗面化されるから、反射面36が鏡面状である構成と比較して導光板22から背面側への出射光を有効に利用する(照明装置20の輝度を増加させる)ことが可能である。しかも、第1実施形態では、反射面36の全域が均一に粗面化されるから、X-Y平面内における輝度の相違(輝度斑)を抑制しながら照明装置20の輝度を充分に確保できるという利点がある。   As described above, in the present embodiment, the light emitted from the rear back surface 223 of the light guide plate 22 is reflected by the reflective surface 36 of the container 30 formed of a light reflective material. The structure which arrange | positioned the reflecting plate in the back side of 22 and the structure (FIG. 11) of the patent document 1 which formed the reflecting film 96 in the surface of the container 94 by vapor deposition, for example are unnecessary. Therefore, there exists an advantage that the manufacturing process of the illuminating device 20 is simplified. Further, since the reflecting surface 36 is roughened so that the reflected light is appropriately scattered, the light emitted from the light guide plate 22 to the back side is effectively used as compared with the configuration in which the reflecting surface 36 is a mirror surface. It is possible to increase the luminance of the lighting device 20. In addition, in the first embodiment, since the entire reflection surface 36 is uniformly roughened, the luminance of the lighting device 20 can be sufficiently ensured while suppressing the luminance difference (luminance unevenness) in the XY plane. There is an advantage.

<B:第2実施形態>
次に、本発明の第2実施形態を説明する。なお、以下の各例示において作用や機能が第1実施形態と同等である要素については、以上と同じ符号を流用して各々の詳細な説明を適宜に省略する。
<B: Second Embodiment>
Next, a second embodiment of the present invention will be described. In addition, about the element in which an effect | action and function are equivalent to 1st Embodiment in each following illustration, the same code | symbol as above is diverted and each detailed description is abbreviate | omitted suitably.

図4は、第2実施形態の収容体30の平面図である。図4では、反射面36のうち粗面化された領域に斜線が付され、反射面36の表面粗さが斜線の粗密で便宜的に表現されている。すなわち、図面内の斜線が密であるほど表面粗さが大きい(表面が粗い)。また、斜線が付されていない領域は、粗面化されていない平坦面を意味する。   FIG. 4 is a plan view of the container 30 of the second embodiment. In FIG. 4, the roughened region of the reflective surface 36 is hatched, and the surface roughness of the reflective surface 36 is expressed as a slanted line for convenience. That is, the denser the oblique lines in the drawing, the larger the surface roughness (the surface is rough). Moreover, the area | region which is not attached with the oblique line means the flat surface which is not roughened.

図4に示すように、反射面36は部分的に粗面化される。図4では、反射面36内の複数の領域A1と領域A2とを粗面化した場合が例示されている。各領域A1は、相隣接する各光源28の間に位置する。各光源28の間隙は輝度が不足し易いから、第1実施形態の反射面36の全域にわたって表面粗さを均一化した構成では、出射面221のうち光源28に近接する領域と各光源28の間隙とで輝度の差異(輝度斑)が発生する可能性がある。図4のように各光源28の間の領域A1を粗面化した構成によれば、各光源28の間隙の輝度が増加するから、照明装置20の輝度斑を抑制することが可能である。   As shown in FIG. 4, the reflecting surface 36 is partially roughened. FIG. 4 illustrates a case where a plurality of regions A1 and regions A2 in the reflecting surface 36 are roughened. Each region A1 is located between adjacent light sources 28. Since the brightness between the light sources 28 tends to be insufficient, in the configuration in which the surface roughness is uniform over the entire reflection surface 36 of the first embodiment, the region of the emission surface 221 that is close to the light source 28 and the light source 28. There may be a difference in brightness (brightness spots) between the gaps. According to the configuration in which the area A1 between the light sources 28 is roughened as shown in FIG. 4, the brightness of the gaps between the light sources 28 increases, so that it is possible to suppress the brightness unevenness of the illumination device 20.

図4に示すように、反射面36には凹凸362が形成される。例えば、射出形成時に可動式の中子または入子が挿入される貫通孔や配線基板(図示略)を収容する段差が、凹凸362として反射面36に形成される。反射面36のうち粗面化された領域A2は、平面視で凹凸362を含むように形成される。反射面36のうち凹凸362が形成された領域は他の領域と比較して輝度が不足する可能性があるが、図4のように凹凸362を含む領域A2を粗面化した構成によれば、凹凸362に起因した輝度斑を抑制することが可能である。   As shown in FIG. 4, irregularities 362 are formed on the reflective surface 36. For example, a step for accommodating a through-hole into which a movable core or insert is inserted during injection molding or a wiring board (not shown) is formed on the reflecting surface 36 as irregularities 362. The roughened region A2 of the reflective surface 36 is formed so as to include irregularities 362 in plan view. In the reflective surface 36, the region where the unevenness 362 is formed may have insufficient luminance as compared with other regions, but according to the configuration in which the region A2 including the unevenness 362 is roughened as shown in FIG. In addition, luminance unevenness due to the unevenness 362 can be suppressed.

図4に示すように、領域A1および領域A2の各々の表面粗さは面内で連続的(または段階的)に変化する。例えば、各領域A1は、当該領域A1の周縁に近い位置ほど表面粗さが小さくなる(すなわち、領域A1の周囲の平坦面の表面粗さに近づく)ように粗面化される。同様に、領域A2は、当該領域A2の周縁に近い位置ほど表面粗さが小さくなるように粗面化されている。以上の構成によれば、領域A1および領域A2の各々にて表面粗さが一定である構成と比較して、領域A1および領域A2の各々とその外側の領域との輝度の差異を目立たなくすることが可能である。もっとも、領域A1および領域A2の各々において表面粗さを一定とした構成も採用され得る。   As shown in FIG. 4, the surface roughness of each of the regions A1 and A2 changes continuously (or stepwise) in the plane. For example, each region A1 is roughened so that the surface roughness becomes smaller as the position is closer to the periphery of the region A1 (that is, the surface roughness of the flat surface around the region A1 is closer). Similarly, the region A2 is roughened so that the surface roughness becomes smaller as the position is closer to the periphery of the region A2. According to the above configuration, the difference in luminance between each of the regions A1 and A2 and the outer region is made inconspicuous compared to the configuration in which the surface roughness is constant in each of the regions A1 and A2. It is possible. However, a configuration in which the surface roughness is constant in each of the region A1 and the region A2 can also be employed.

<C:第3実施形態>
図5は、第3実施形態の収容体30の平面図である。図5に示すように、第3実施形態の収容体30の反射面36は、表面粗さが面内で変化するように全域にわたって粗面化される。図5では、入射面225から遠い位置ほど表面粗さが大きくなるように反射面36の全域を粗面化した場合が例示されている。
<C: Third Embodiment>
FIG. 5 is a plan view of the container 30 of the third embodiment. As shown in FIG. 5, the reflective surface 36 of the container 30 of the third embodiment is roughened over the entire region so that the surface roughness changes in the plane. FIG. 5 illustrates a case where the entire reflection surface 36 is roughened so that the surface roughness increases as the position is farther from the incident surface 225.

以上の構成においても第1実施形態と同様の効果が実現される。なお、反射面36内の全域にわたって表面粗さが均一化された第1実施形態では、入射面225から遠い位置ほど輝度が不足する可能性があるが、第3実施形態によれば、反射面36のうち入射面225から遠い位置ほど表面粗さが大きいから、入射面225からの遠近に関わらず反射面36の面内の輝度を有効に均一化することが可能である。   Even in the above configuration, the same effect as in the first embodiment is realized. In the first embodiment in which the surface roughness is uniform over the entire area in the reflection surface 36, the luminance may be insufficient as the position is farther from the incident surface 225. However, according to the third embodiment, the reflection surface Since the surface roughness of 36 is farther from the incident surface 225, the surface roughness is larger. Therefore, it is possible to effectively equalize the luminance within the reflecting surface 36 regardless of the distance from the incident surface 225.

<D:第4実施形態>
図6は、第4実施形態の収容体30の斜視図である。以上の各形態では、収容体30のうち底面部32の反射面36を粗面化した。第4実施形態では、収容体30の反射面36に加えて側面部34の内周面38も粗面化される。以上の構成によれば、導光板22の側端面から出射した光が側面部34の内周面38で適度に散乱した状態で反射して再び導光板22の側端面に入射する。したがって、側面部34の内周面38が平坦面(鏡面)とされた構成と比較して導光板22の周縁の近傍での輝度斑を低減することが可能である。
<D: Fourth Embodiment>
FIG. 6 is a perspective view of the container 30 of the fourth embodiment. In each of the above embodiments, the reflecting surface 36 of the bottom surface portion 32 of the container 30 is roughened. In the fourth embodiment, in addition to the reflection surface 36 of the container 30, the inner peripheral surface 38 of the side surface portion 34 is also roughened. According to the above configuration, the light emitted from the side end surface of the light guide plate 22 is reflected while being appropriately scattered by the inner peripheral surface 38 of the side surface portion 34 and is incident on the side end surface of the light guide plate 22 again. Therefore, it is possible to reduce luminance unevenness in the vicinity of the periphery of the light guide plate 22 as compared with a configuration in which the inner peripheral surface 38 of the side surface portion 34 is a flat surface (mirror surface).

<E:変形例>
以上の形態は多様に変形され得る。具体的な変形の態様を以下に例示する。以下の例示から任意に選択された2以上の態様は適宜に併合され得る。
<E: Modification>
The above forms can be variously modified. Specific modifications are exemplified below. Two or more aspects arbitrarily selected from the following examples can be appropriately combined.

(1)変形例1
以上の各形態では、反射面36の表面粗さが大きいほど輝度が増加する場合を例示したが、拡散板24や集光板26の光学特性によっては、反射面36の表面粗さが大きいほど輝度が減少する場合もある。例えば、図7に示すように、垂直に近い角度(Z方向に近い角度)で背面側から集光板26に入射した光が集光面(プリズム構造が形成された前面側の表面)262にて背面側に反射する構成では、反射面36での反射光のうちZ方向に近い成分を反射面36の粗面化で増加させた領域ほど、表示体10に対する出射光の輝度が低下する可能性がある。以上の構成では、各実施形態での例示とは逆に、反射面36のうち輝度が不足し易い領域以外の領域ほど表面粗さが大きくなるように反射面36を粗面化した構成が好適である。例えば、図4に例示した領域A1および領域A2を平坦面として他の領域を粗面とした構成や、図5とは逆に、反射面36のうち入射面225から遠い位置ほど表面粗さを小さくした(平坦面に近づけた)構成が採用され得る。
(1) Modification 1
In each of the above embodiments, the case where the luminance increases as the surface roughness of the reflecting surface 36 increases is illustrated. However, depending on the optical characteristics of the diffusion plate 24 and the light collector 26, the luminance increases as the surface roughness of the reflecting surface 36 increases. May decrease. For example, as shown in FIG. 7, light incident on the light collector 26 from the back side at an angle close to vertical (an angle close to the Z direction) is incident on the light collecting surface (front surface on which the prism structure is formed) 262. In the configuration of reflecting to the back side, the luminance of the emitted light with respect to the display body 10 may decrease as the region in which the component close to the Z direction is increased by roughening the reflecting surface 36 in the reflected light on the reflecting surface 36. There is. In the above configuration, contrary to the examples in the embodiments, a configuration in which the reflective surface 36 is roughened so that the surface roughness of the reflective surface 36 other than the region where the luminance is likely to be insufficient increases. It is. For example, the region A1 and the region A2 illustrated in FIG. 4 are flat surfaces and the other regions are rough surfaces. Contrary to FIG. 5, the surface roughness of the reflecting surface 36 is further away from the incident surface 225. A reduced configuration (closer to a flat surface) can be employed.

(2)変形例2
収容体30の反射面36を粗面化する方法は適宜に変更される。例えば、微細な粒子状の研磨材を反射面30に衝突させるブラスト処理(例えばサンドブラスト)や、表面に凹凸が形成された加工体で反射面36を押圧するプレス加工、反射面36の微細な部分を除去するエッチング処理等が、反射面36の粗面化に利用され得る。また、反射面36の形成面が以上の各処理で粗面化された金型を利用した射出成形でも、反射面36が粗面化された収容体30を作成することが可能である。なお、収容体30の素材は樹脂材料に限定されない。例えば、光反射性の金属材料の加工(例えば曲げ加工や絞り加工)でも収容体30は形成され得る。
(2) Modification 2
The method of roughening the reflecting surface 36 of the container 30 is changed as appropriate. For example, a blasting process (for example, sand blasting) in which a fine particulate abrasive is made to collide with the reflecting surface 30, a pressing process that presses the reflecting surface 36 with a processed body having irregularities formed on the surface, and a fine portion of the reflecting surface 36. Etching or the like for removing the surface can be used to roughen the reflective surface 36. Further, it is possible to produce the container 30 with the roughened reflecting surface 36 even by injection molding using a mold in which the forming surface of the reflecting surface 36 is roughened by the above-described processes. In addition, the raw material of the container 30 is not limited to a resin material. For example, the container 30 can be formed by processing a light-reflective metal material (for example, bending or drawing).

(3)変形例3
以上の各形態における表示体10は液晶パネルに限定されない。例えば、電気泳動素子を行列状に配列した表示体10も採用され得る。以上の説明から理解されるように、以上の各例示における表示体10は、電界の印加等の電気的な作用に応じて階調(例えば透過率)が変化する電気光学素子(液晶素子Eや電気泳動素子)を利用して画像を表示する要素として包括される。
(3) Modification 3
The display body 10 in each of the above embodiments is not limited to a liquid crystal panel. For example, the display body 10 in which the electrophoretic elements are arranged in a matrix may be employed. As understood from the above description, the display body 10 in each of the above examples is an electro-optical element (liquid crystal element E or liquid crystal element E or the like) whose gradation (for example, transmittance) changes according to an electric action such as application of an electric field. It is included as an element for displaying an image using an electrophoretic element.

<F:応用例>
以上に例示した電気光学装置100は、各種の電子機器に利用され得る。図8から図10には、電気光学装置100を採用した電子機器の具体的な形態が例示されている。
<F: Application example>
The electro-optical device 100 exemplified above can be used in various electronic apparatuses. 8 to 10 exemplify specific forms of electronic apparatuses that employ the electro-optical device 100. FIG.

図8は、電気光学装置100を採用した可搬型のパーソナルコンピュータの構成を示す斜視図である。パーソナルコンピュータ2000は、各種の画像を表示する電気光学装置100と、電源スイッチ2001やキーボード2002が設置された本体部2010とを具備する。   FIG. 8 is a perspective view illustrating a configuration of a portable personal computer that employs the electro-optical device 100. The personal computer 2000 includes an electro-optical device 100 that displays various images, and a main body 2010 on which a power switch 2001 and a keyboard 2002 are installed.

図9は、電気光学装置100を適用した携帯電話機の構成を示す斜視図である。携帯電話機3000は、複数の操作ボタン3001およびスクロールボタン3002と、各種の画像を表示する電気光学装置100とを備える。スクロールボタン3002を操作することによって、電気光学装置100に表示される画面がスクロールされる。   FIG. 9 is a perspective view illustrating a configuration of a mobile phone to which the electro-optical device 100 is applied. The cellular phone 3000 includes a plurality of operation buttons 3001 and scroll buttons 3002, and the electro-optical device 100 that displays various images. By operating the scroll button 3002, the screen displayed on the electro-optical device 100 is scrolled.

図10は、電気光学装置100を適用した携帯情報端末(PDA:Personal Digital Assistants)の構成を示す斜視図である。情報携帯端末4000は、複数の操作ボタン4001および電源スイッチ4002と、各種の画像を表示する電気光学装置100とを備える。電源スイッチ4002を操作すると、住所録やスケジュール帳といった様々な情報が電気光学装置100に表示される。   FIG. 10 is a perspective view illustrating a configuration of a personal digital assistant (PDA) to which the electro-optical device 100 is applied. The portable information terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002, and the electro-optical device 100 that displays various images. When the power switch 4002 is operated, various information such as an address book and a schedule book are displayed on the electro-optical device 100.

なお、本発明に係る電気光学装置100が適用される電子機器としては、図8から図10に例示した機器のほか、プロジェクタ,デジタルスチルカメラ,テレビ,ビデオカメラ,カーナビゲーション装置,車載用の表示器(インパネ),電子手帳,電子ペーパー,電卓,ワードプロセッサ,ワークステーション,テレビ電話,POS端末,プリンタ,スキャナ,複写機,ビデオプレーヤ,タッチパネルを備えた機器等などが挙げられる。   Note that electronic devices to which the electro-optical device 100 according to the present invention is applied include the projectors, digital still cameras, televisions, video cameras, car navigation devices, and in-vehicle displays in addition to the devices illustrated in FIGS. Examples include instruments (instrument panels), electronic notebooks, electronic paper, calculators, word processors, workstations, videophones, POS terminals, printers, scanners, copiers, video players, devices equipped with touch panels, and the like.

100……電気光学装置、10……表示体、12……第1基板、14……第2基板、E……液晶素子、20……照明装置、22……導光板、221……出射面、223……後背面、24……拡散板、26……集光板、28……光源、30……収容体、32……底面部、34……側面部、36……反射面。
DESCRIPTION OF SYMBOLS 100 ... Electro-optical device, 10 ... Display body, 12 ... 1st board | substrate, 14 ... 2nd board | substrate, E ... Liquid crystal element, 20 ... Illumination device, 22 ... Light guide plate, 221 ... Output surface 223: Rear rear surface, 24 ... Diffuser plate, 26 ... Light collector, 28 ... Light source, 30 ... Container, 32 ... Bottom surface portion, 34 ... Side surface portion, 36 ... Reflective surface.

Claims (7)

入射面と第1面と前記第1面の反対側の第2面とを含み、前記入射面に対する入射光を前記第1面に導く導光板と、
前記入射面に光を照射する光源と、
光反射性の材料で形成されて前記導光板を収容する収容体とを具備し、
前記収容体のうち前記導光板の前記第2面との対向面は、粗面化された領域を含み、前記第2面からの出射光を反射する反射面である
ことを特徴とする照明装置。
A light guide plate that includes an incident surface, a first surface, and a second surface opposite to the first surface, and that guides incident light to the incident surface to the first surface;
A light source for irradiating the incident surface with light;
A housing that is formed of a light-reflective material and houses the light guide plate;
A surface of the container that faces the second surface of the light guide plate is a reflective surface that includes a roughened region and reflects light emitted from the second surface. .
前記反射面は、その全域にわたって粗面化されている
ことを特徴とする請求項1の照明装置。
The lighting device according to claim 1, wherein the reflecting surface is roughened over the entire area.
前記反射面は、部分的に粗面化されている
ことを特徴とする請求項1の照明装置。
The lighting device according to claim 1, wherein the reflecting surface is partially roughened.
前記反射面のうち前記粗面化された領域の表面粗さは前記反射面の面内で均一である
ことを特徴とする請求項1から請求項3の何れかの照明装置。
4. The lighting device according to claim 1, wherein a surface roughness of the roughened region of the reflective surface is uniform within the surface of the reflective surface. 5.
前記反射面のうち前記粗面化された領域の表面粗さは前記反射面の面内で相違する
ことを特徴とする請求項1から請求項3の何れかの照明装置。
4. The illumination device according to claim 1, wherein a surface roughness of the roughened region of the reflective surface is different within a surface of the reflective surface. 5.
前記収容体は、
前記反射面を含む平板状の底面部と、
前記導光板の側端面に対向するように前記底面部の周縁から突出する側面部とを含み、
前記側面部の内周面は、粗面化された領域を含む
ことを特徴とする請求項1から請求項5の何れかの照明装置。
The container is
A flat bottom surface including the reflective surface;
Including a side surface portion projecting from a peripheral edge of the bottom surface portion so as to face a side end surface of the light guide plate,
The lighting device according to any one of claims 1 to 5, wherein the inner peripheral surface of the side surface portion includes a roughened region.
請求項1から請求項6の何れかの照明装置と、
前記照明装置の前記第1面からの出射光の透過率が変化する複数の電気光学素子が面状に配列された表示体と
を具備することを特徴とする電気光学装置。
The lighting device according to any one of claims 1 to 6,
An electro-optical device comprising: a display body in which a plurality of electro-optical elements that change the transmittance of emitted light from the first surface of the illumination device are arranged in a planar shape.
JP2010054083A 2010-03-11 2010-03-11 Lighting system and electro-optical device Pending JP2011187399A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002093202A (en) * 2000-09-13 2002-03-29 Ryoden Trading Co Ltd Surface light emitting back light device and method of manufacturing it
JP2004213998A (en) * 2002-12-27 2004-07-29 Advanced Display Inc Planar light source device
JP2006293963A (en) * 2005-04-11 2006-10-26 Hideyasu Uchino Mouse wear with smell
JP2007311252A (en) * 2006-05-19 2007-11-29 Nippon Leiz Co Ltd Plane illumination device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002093202A (en) * 2000-09-13 2002-03-29 Ryoden Trading Co Ltd Surface light emitting back light device and method of manufacturing it
JP2004213998A (en) * 2002-12-27 2004-07-29 Advanced Display Inc Planar light source device
JP2006293963A (en) * 2005-04-11 2006-10-26 Hideyasu Uchino Mouse wear with smell
JP2007311252A (en) * 2006-05-19 2007-11-29 Nippon Leiz Co Ltd Plane illumination device

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