JP4815381B2 - Light emitting device, linear light emitting device, planar light emitting device, liquid crystal display device, and electronic apparatus - Google Patents

Light emitting device, linear light emitting device, planar light emitting device, liquid crystal display device, and electronic apparatus Download PDF

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JP4815381B2
JP4815381B2 JP2007094570A JP2007094570A JP4815381B2 JP 4815381 B2 JP4815381 B2 JP 4815381B2 JP 2007094570 A JP2007094570 A JP 2007094570A JP 2007094570 A JP2007094570 A JP 2007094570A JP 4815381 B2 JP4815381 B2 JP 4815381B2
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light
emitting device
light emitting
liquid crystal
reflecting
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JP2008251483A (en
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孝介 久保田
信一 若林
豪 中谷
俊郎 堀内
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Panasonic Corp
Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Description

本発明は、反射板の反射面での反射光の方向を制御し、輝度の均一性を向上させることができる発光装置、線状発光装置、面状発光装置、液晶表示装置、及び電子機器に関する。   The present invention relates to a light-emitting device, a linear light-emitting device, a planar light-emitting device, a liquid crystal display device, and an electronic apparatus that can improve the uniformity of luminance by controlling the direction of reflected light on a reflecting surface of a reflecting plate. .

近時、携帯電話機や薄型のテレビジョン受信機など各種の幅広い分野において、液晶表示装置（ＬＣＤ）が広く普及している。また、通常、この液晶表示装置は、光源からの光を導光板や反射板などを介して液晶表示装置本体へ投光し、照明するためのバックライト装置を備えている（例えば、特許文献１参照）。   Recently, liquid crystal display devices (LCDs) are widely used in various fields such as mobile phones and thin television receivers. In addition, this liquid crystal display device usually includes a backlight device for projecting light from a light source onto a liquid crystal display device main body through a light guide plate or a reflection plate (for example, Patent Document 1). reference).

このようなバックライト装置としては、例えば、図７に示すように、拡散板１０１に略平行に配置される複数の棒状光源１０２と、この棒状光源１０２の反拡散板側に棒状光源１０２から出射する光を拡散板１０１に向けて反射する反射板１０３とを配設させたものが知られている。また、この反射板１０３は、棒状光源１０２の長手軸に平行に延伸した長手軸を有する複数の樋状の反射板で構成されており、棒状光源１０２のそれぞれに対して、凹面が棒状光源１０２側に向けて配設されている。また、この複数の樋状の反射板１０３は、それぞれ独立に成形されており、それぞれ独立に支持されている。なお、同図において、バックライト装置は、更に、筐体の側壁１０４、支柱１０５、液晶表示装置（ＬＣＤ）１０６、拡散シート１０７、基板１０８を備えている。   As such a backlight device, for example, as shown in FIG. 7, a plurality of rod-shaped light sources 102 arranged substantially parallel to the diffusion plate 101, and the rod-shaped light source 102 emits light from the rod-shaped light source 102 on the side opposite to the diffusion plate. A reflection plate 103 that reflects light to be reflected toward the diffusion plate 101 is known. The reflecting plate 103 is composed of a plurality of bowl-shaped reflecting plates having a longitudinal axis extending parallel to the longitudinal axis of the rod-shaped light source 102, and the concave surface of each of the rod-shaped light sources 102 has a concave surface. It is arranged toward the side. In addition, the plurality of bowl-shaped reflectors 103 are independently formed and supported independently. In the figure, the backlight device further includes a side wall 104 of the housing, a support column 105, a liquid crystal display (LCD) 106, a diffusion sheet 107, and a substrate 108.

特開２００４−２６５７０９号公報JP 2004-265709 A

しかしながら、このような構成のバックライト装置にあっては、通常、棒状の光源として冷陰極管（ＣＣＦＬ）が使用されているが、消費電力やサイズなどの観点から携帯電話などのモバイル機器では光源として点状の光源であるＬＥＤが使用されることが多い。よって、ＬＥＤの近傍ではＬＥＤから出射される光が一様に広がらず輝度の均一性が不十分である。また、このＬＥＤは、面発光タイプ（ＥＥＬＥＤ）のものも一部あるにはあるが、点光源タイプのものが殆どであるため、導光板の入射部付近に光を拡散させるための構造や材料が必要となっている。   However, in the backlight device having such a configuration, a cold cathode fluorescent lamp (CCFL) is usually used as a rod-shaped light source. However, a mobile device such as a cellular phone has a light source in terms of power consumption and size. In many cases, an LED which is a point light source is used. Therefore, the light emitted from the LED does not spread uniformly in the vicinity of the LED, and the luminance uniformity is insufficient. In addition, although some of these LEDs are of surface emission type (EELED), most of them are point light source types, so that structures and materials for diffusing light near the incident part of the light guide plate are used. Is required.

本発明は、上記事情に鑑みてなされたもので、輝度の均一性を向上させることができる発光装置、線状発光装置、面状発光装置、液晶表示装置、及び電子機器を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a light-emitting device, a linear light-emitting device, a planar light-emitting device, a liquid crystal display device, and an electronic apparatus that can improve luminance uniformity. And

本発明の発光装置は、基材と、前記基材に搭載され、光を発する発光素子と、凸状の面を有し、前記光を反射する第１反射面を持ち、前記基材に搭載された第１反射部材と、凹状の面を有し、前記光を反射する第２反射面を持ち、前記発光素子を基準に前記第１反射部材と反対側の位置で、前記基材に搭載された第２反射部材と、を備え、前記光を直接的に被照明物に投光し、前記第１反射面で反射した光を光照明物に投光し、前記第２反射面で反射した光を被照明物に投光するものである。   The light-emitting device of the present invention has a base material, a light-emitting element that is mounted on the base material and emits light, a convex surface, a first reflective surface that reflects the light, and is mounted on the base material. A first reflecting member that has a concave surface, a second reflecting surface that reflects the light, and is mounted on the substrate at a position opposite to the first reflecting member with respect to the light emitting element. A second reflecting member, and projects the light directly onto the object to be illuminated, projects the light reflected on the first reflecting surface onto the object to be illuminated, and reflects the reflected light on the second reflecting surface. The projected light is projected onto the object to be illuminated.

本発明の線状発光装置は、直線の上に配置された、上記第１の発光装置と、前記直線の上に配置された、上記第２の発光装置と、を備え、前記第１の発光装置の第２反射面が前記直線の方向の外側に配置され、前記第２の発光装置の第２反射面が前記直線の方向の外側に配置されるものである。   The linear light-emitting device of the present invention includes the first light-emitting device disposed on a straight line, and the second light-emitting device disposed on the straight line, and the first light-emitting device. The second reflective surface of the device is disposed outside the straight line direction, and the second reflective surface of the second light emitting device is disposed outside the straight line direction.

本発明の面状発光装置は、上記の線状発光装置と、当該線状発光装置からの光を端面から入射するように前記線状発光装置と対向配置する導光板とを備えたものである。   A planar light-emitting device of the present invention includes the above-described linear light-emitting device and a light guide plate that is disposed to face the linear light-emitting device so that light from the linear light-emitting device is incident from an end surface. .

本発明の液晶表示装置は、上記の面状発光装置と、当該面状発光装置に積層配置する液晶パネルとを備えたものである。   A liquid crystal display device according to the present invention includes the above planar light emitting device and a liquid crystal panel that is stacked on the planar light emitting device.

本発明の電子機器は、上記の液晶表示装置を含むものである。   The electronic apparatus of the present invention includes the liquid crystal display device described above.

本発明によれば、反射部材は、発光素子を挟んだ両側にこの発光素子を臨む状態で、第１反射面を１対対向配置し、または、第１反射面と第２反射面を対向配置した構成であって、第１反射面は、投光方向に向けて傾斜した平面または少なくとも一部に凸状の面を有し、第２反射面は、少なくとも一部に凹状の面を有するので、輝度の均一性を向上させることができる。   According to the present invention, the reflecting member has a pair of first reflecting surfaces facing each other with the light emitting elements facing both sides of the light emitting element, or a first reflecting surface and a second reflecting surface facing each other. The first reflecting surface has a flat surface inclined toward the light projecting direction or at least a convex surface, and the second reflecting surface has a concave surface at least partially. , Brightness uniformity can be improved.

以下、本発明の実施形態について、添付図面を参照しながら詳細に説明する。
図１は、本発明の実施形態に係る携帯電話機１を示すものであり、この携帯電話機１は、本発明に係る液晶表示装置に相当する液晶表示部２を設けた上部筐体１Ａと、操作部１１を設けた下部筐体１Ｂと、これら上部筐体１Ａと下部筐体１Ｂを回動可能に連結するヒンジ部１Ｃとを備えている。 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows a cellular phone 1 according to an embodiment of the present invention. The cellular phone 1 includes an upper housing 1A provided with a liquid crystal display unit 2 corresponding to a liquid crystal display device according to the present invention, and an operation. A lower housing 1B provided with a portion 11 and a hinge portion 1C for rotatably connecting the upper housing 1A and the lower housing 1B.

液晶表示部２は、図２に示すように、ドライバＩＣ２１１、偏光板２１２、ガラス基板２１３などを含む液晶パネル本体２１と、フレキシブルプリント基板（ＦＰＣ）２２，２２Ａと、本発明に係る面状発光装置に相当する面状発光装置３と、これらを収容するホルダ２５などを備えている。   As shown in FIG. 2, the liquid crystal display unit 2 includes a liquid crystal panel main body 21 including a driver IC 211, a polarizing plate 212, a glass substrate 213, flexible printed circuit boards (FPC) 22 and 22 A, and a planar light emission according to the present invention. A planar light emitting device 3 corresponding to the device, a holder 25 for accommodating these, and the like are provided.

面状発光装置３は、図２に示すように、被照明物に相当する導光板３１と、反射シート３２と、拡散シート３３と、集光シート３４と、リムシート３５と、本発明に係る線状発光装置に相当する線状発光装置４などを備えている。このうち、導光板３１は、線状発光装置４からの照明光が均一な状態で入射し、液晶パネル本体２１の有効発光領域Ｌ（図３参照）の全面にわたって均一に投光させるものである。反射シート３２は、線状発光装置４からの光が入射した導光板３１において、液晶パネル本体２１と対面する表面とは反対の裏面などから漏出する光を反射させて再び導光板３１へ入射させて戻すことで、線状発光装置４からの照明光の利用効率を高めるものである。拡散シート３３は、導光板３１から液晶パネル本体２１の有効発光領域Ｌへ投光された光を拡散させて輝度の均一性を高めるものである。集光シート３４は、導光板３１から液晶パネル本体２１の有効発光領域Ｌへ投光された光をＺ軸方向に集光することで液晶パネル本体２１を鉛直方向（Ｚ軸方向）から見た時の輝度を高めるものである。リムシート３５は、面上発光装置３と液晶パネル本体２１を固定するものである。   As shown in FIG. 2, the planar light emitting device 3 includes a light guide plate 31 corresponding to an object to be illuminated, a reflection sheet 32, a diffusion sheet 33, a light collection sheet 34, a rim sheet 35, and a line according to the present invention. The linear light-emitting device 4 etc. corresponded to a linear light-emitting device. Among these, the light guide plate 31 receives illumination light from the linear light-emitting device 4 in a uniform state, and uniformly projects the entire surface of the effective light-emitting region L (see FIG. 3) of the liquid crystal panel body 21. . The reflection sheet 32 reflects the light leaking from the back surface opposite to the surface facing the liquid crystal panel body 21 in the light guide plate 31 on which the light from the linear light emitting device 4 is incident, and makes it incident on the light guide plate 31 again. Thus, the utilization efficiency of the illumination light from the linear light emitting device 4 is increased. The diffusion sheet 33 diffuses the light projected from the light guide plate 31 to the effective light emitting region L of the liquid crystal panel body 21 to improve the uniformity of luminance. The condensing sheet 34 condenses the light projected from the light guide plate 31 to the effective light emitting region L of the liquid crystal panel main body 21 in the Z-axis direction, thereby viewing the liquid crystal panel main body 21 from the vertical direction (Z-axis direction). It increases the brightness of the hour. The rim sheet 35 fixes the surface light emitting device 3 and the liquid crystal panel main body 21.

線状発光装置４は、液晶表示部２の液晶パネル本体２１を照明するバックライト用の面状発光装置３の要部を構成するものであり、導光板３１の発光装置５と対面する一端面３１Ａ（以下、「入射端面」とよぶ）に対向配置されている。また、この線状発光装置４は、図３（Ｂ）及び図４に示すように、導光板３１の入射端面３１Ａに平行なＹ軸方向に沿ってライン状に複数個設けた発光装置５で構成されている。   The linear light emitting device 4 constitutes a main part of the backlight planar light emitting device 3 that illuminates the liquid crystal panel main body 21 of the liquid crystal display unit 2, and one end surface of the light guide plate 31 facing the light emitting device 5. 31 A (hereinafter referred to as “incident end face”). Further, as shown in FIGS. 3B and 4, the linear light-emitting device 4 is a light-emitting device 5 provided in a plurality of lines along the Y-axis direction parallel to the incident end surface 31 </ b> A of the light guide plate 31. It is configured.

本実施形態の発光装置５は、第１発光装置５Ａ〜第４発光装置５Ｄから構成されており、各発光装置５Ａ〜５Ｄには、基板５１と、この基板５１上に実装された光源であるＬＥＤチップ（以下、「ＬＥＤ」と略す）５２と、このＬＥＤ５２を挟んで両側に設けた反射部材５３と、この反射部材５３の反射面Ｒに臨む凹状の窪み状空間を埋めるようにして設けた蛍光体５４とを、それぞれ備えている。   The light emitting device 5 according to the present embodiment includes a first light emitting device 5A to a fourth light emitting device 5D, and each of the light emitting devices 5A to 5D is a substrate 51 and a light source mounted on the substrate 51. An LED chip (hereinafter abbreviated as “LED”) 52, a reflecting member 53 provided on both sides of the LED 52, and a recessed hollow space facing the reflecting surface R of the reflecting member 53 are provided. Each of the phosphors 54 is provided.

基板５１は、ＦＰＣ（フレキシブルプリント基板）２２を介して図示外の電源回路からの電力をＬＥＤ５２へ供給させるためにＦＰＣ２２と電気的に接続されている。図示外の電源回路は、バッテリパックから供給される電力をＬＥＤ５２の駆動に適した電圧に変換する機能を有する。   The substrate 51 is electrically connected to the FPC 22 in order to supply power from an unillustrated power supply circuit to the LED 52 via an FPC (flexible printed circuit board) 22. A power supply circuit (not shown) has a function of converting electric power supplied from the battery pack into a voltage suitable for driving the LED 52.

ＬＥＤ５２は、基板５１の表面に対して垂直な方向（Ｘ軸方向）を基準にして左右対称の配光パターンで固有波長の可視光を出射するものであり、基板５１上に実装されている。本実施形態では、波長がおよそ４２０ｎｍ乃至４７０ｎｍの青色光を出射する青色ＬＥＤを用いている。   The LED 52 emits visible light having a specific wavelength with a light distribution pattern symmetric with respect to a direction perpendicular to the surface of the substrate 51 (X-axis direction), and is mounted on the substrate 51. In the present embodiment, a blue LED that emits blue light having a wavelength of about 420 nm to 470 nm is used.

反射部材５３は、線状発光装置４において、両端側の発光装置（第１発光装置５Ａ及び第４発光装置５Ｄ）の反射部材と、それ以外の内側の発光装置（第２発光装置５Ｂ及び第３発光装置５Ｃ）の反射部材とで異なる構成となっている。   In the linear light emitting device 4, the reflecting member 53 includes the reflecting members of the light emitting devices on the both end sides (the first light emitting device 5A and the fourth light emitting device 5D) and the other inner light emitting devices (the second light emitting device 5B and the first light emitting device 5D). The configuration differs from that of the reflective member of the three light emitting devices 5C).

即ち、線状発光装置４の両端側にある第１発光装置５Ａ及び第４発光装置５Ｄの反射部材５３の方は、図４及び図５（Ａ）に示すように、反射面Ｒが左右非対称に形成されている。即ち、この第１発光装置５Ａ及び第４発光装置５Ｄの反射部材５３は、それぞれ、内側寄り（線状発光装置４の中心に近い方）に配置した、光を拡散させる凸型の反射部材（以下、「第１反射部材」とよぶ）５３１と、外側寄り（線状発光装置４において発光装置５を配列するライン方向の最外部に相当する）に配置した、光が特定方向に進行しないようにした凹型の反射部材（以下、「第２反射部材」とよぶ）５３２とで構成されている。   That is, the reflecting member 53 of the first light emitting device 5A and the fourth light emitting device 5D on both ends of the linear light emitting device 4 has a reflective surface R that is asymmetrical as shown in FIGS. 4 and 5A. Is formed. In other words, the reflecting members 53 of the first light emitting device 5A and the fourth light emitting device 5D are arranged on the inner side (closer to the center of the linear light emitting device 4), and are convex reflecting members that diffuse light ( Hereinafter, the light is arranged so as not to travel in a specific direction, which is arranged on the outer side (corresponding to the outermost part in the line direction in which the light emitting devices 5 are arranged in the linear light emitting device 4). And a concave reflecting member (hereinafter referred to as “second reflecting member”) 532.

第１反射部材５３１は、入射端面３１Ａ方向に向けて傾斜した平面状または少なくとも一部が凸状を呈する反射面（以下、「第１反射面」とよぶ）Ｒ１を形成している。第１反射面Ｒ１の凸形状は、個々の第１反射面Ｒ１の曲率を最適な状態に設定しており、反射光の方向を制御して全体の光の出射分布の均一性を向上させている。一方、第２反射部材５３２は、入射端面３１Ａ方向に向けて凹状を呈する反射面（以下、「第２反射面」とよぶ）Ｒ２を形成している。第２反射面Ｒ２は、導光板３１の入射端面３１Ａの両端部近傍付近での入射方向がほぼ垂直となるような固有の曲率を有している。   The first reflecting member 531 forms a reflecting surface (hereinafter referred to as a “first reflecting surface”) R1 that is inclined in the direction of the incident end face 31A or at least partially convex. The convex shape of the first reflecting surface R1 sets the curvature of each first reflecting surface R1 to an optimal state, and controls the direction of the reflected light to improve the uniformity of the overall light emission distribution. Yes. On the other hand, the second reflecting member 532 forms a reflecting surface (hereinafter referred to as a “second reflecting surface”) R2 having a concave shape toward the incident end surface 31A. The second reflecting surface R2 has a unique curvature such that the incident direction in the vicinity of both end portions of the incident end surface 31A of the light guide plate 31 is substantially vertical.

ここで、第１反射面Ｒ１を平面状または少なくとも一部を凸状としたのは、ここで反射した光が、導光板３１の入射端面３１Ａに入射する際に一部方向に集中して入射するのを避け、できるだけ拡散させて入射光分布の均一化を図るようにするためである。一方、第２反射面Ｒ２を凹状としたのは、ここで反射した光が、導光板３１の入射端面３１Ａに入射する際に、この入射端面３１Ａからそれてしまい入射できずに導光板３１よりも外部に逃げていくのを防止することで、漏れなく入射端面３１Ａに入射させるようにするのと同時に、入射端面３１Ａの両端部側に集中して入射するのを阻止して、入射光分布の均一化も図るようにするためである。これにより、導光板３１の入射端面３１Ａから内部に入射直後の光が、この入射端面３１Ａと直交する端面（以下、「側端面」とよぶ）３１Ｂ，３１Ｃに集中するのを阻止することで、側端面３１Ｂ，３１Ｃにおいて、手前側（線状発光装置４寄り）の部位から集中して出光するのも防止できる。   Here, the first reflecting surface R1 is planar or at least partially convex. The light reflected here is concentrated in a part of the direction when entering the incident end surface 31A of the light guide plate 31. This is to avoid the occurrence of light and to diffuse as much as possible so as to make the distribution of incident light uniform. On the other hand, the second reflecting surface R2 has a concave shape. When the light reflected here is incident on the incident end surface 31A of the light guide plate 31, the light is deviated from the incident end surface 31A and cannot enter. By preventing the light from escaping to the outside, the incident light can be incident on the incident end face 31A without leakage, and at the same time, the incident light can be prevented from being concentratedly incident on both end sides of the incident end face 31A. This is for the purpose of achieving equalization. Thereby, the light immediately after entering from the incident end face 31A of the light guide plate 31 is prevented from concentrating on the end faces (hereinafter referred to as “side end faces”) 31B and 31C orthogonal to the incident end face 31A. In the side end surfaces 31B and 31C, it is possible to prevent the light from being concentrated from the front side (near the linear light emitting device 4).

次に、線状発光装置４の中央側にある第２発光装置５Ｂ及び第３発光装置５Ｃの反射部材５３の方は、図４及び図５（Ｂ）に示すように、反射面Ｒが左右対称のもので構成されている。即ち、この第２発光装置５Ｂ及び第３発光装置５Ｃの反射部材５３は、いずれも、左右が第１反射部材５３１で構成されている。従って、この第１反射部材５３１は、上述したように、反射面が第１反射面Ｒ１を形成している。   Next, as shown in FIGS. 4 and 5 (B), the reflecting member 53 of the second light emitting device 5B and the third light emitting device 5C on the center side of the linear light emitting device 4 has the reflecting surface R left and right. It is composed of symmetrical objects. That is, the reflecting members 53 of the second light emitting device 5B and the third light emitting device 5C are both composed of the first reflecting member 531 on the left and right. Therefore, as described above, the first reflecting member 531 has the reflecting surface forming the first reflecting surface R1.

このように、第２発光装置５Ｂ及び第３発光装置５Ｃでの反射面を第１反射面Ｒ１としたのは、ＬＥＤ５２から出射して蛍光体５４を透過後、導光板３１の入射端面３１Ａへ向かうときの光をそれぞれ外方側へ拡散させることで、光をできるだけ均一に広がらせるようにして、各ＬＥＤ５２から出射する光の光軸付近に反射光が集中することで導光板３１での入射分布にむらが発生するのを、回避するためである。   Thus, the reason why the reflecting surfaces of the second light emitting device 5B and the third light emitting device 5C are the first reflecting surface R1 is that they are emitted from the LED 52, transmitted through the phosphor 54, and then to the incident end surface 31A of the light guide plate 31. By diffusing the light traveling toward each outward, the light is spread as uniformly as possible, and the reflected light is concentrated near the optical axis of the light emitted from each LED 52, so that the incident light is incident on the light guide plate 31. This is to avoid the occurrence of unevenness in the distribution.

蛍光体５４は、ＬＥＤ５２からの青色（Ｂ）光が入射すると、その一部が蛍光物質内の電子と衝突することによって励起され、黄色（Ｙ）の波長の蛍光を放射するようになっている。その結果、このような蛍光現象によって発生する黄色成分と、蛍光物質に吸収されないで残った青色光とが合成されて白色の光が生成される。換言すれば、青色（Ｂ）とその補色である黄色（Ｙ）の波長の合成により、白色の光を発生させるものである。   When the blue (B) light from the LED 52 is incident on the phosphor 54, a part of the phosphor 54 is excited by colliding with an electron in the phosphor, and emits yellow (Y) wavelength fluorescence. . As a result, the yellow component generated by such a fluorescent phenomenon and the blue light remaining without being absorbed by the fluorescent material are combined to generate white light. In other words, white light is generated by combining wavelengths of blue (B) and yellow (Y) which is a complementary color thereof.

次に、本実施形態の作用について説明する。
図１において、携帯電話機１の図示外の電源を入れる。すると、図２に示す液晶表示装置である液晶表示部２内部の面状発光装置３の要部を構成する線状発光装置４において、図４に示す発光装置５の第１発光装置５Ａ〜第４発光装置５Ｄに設けてあるＬＥＤ５２に、図示外のバッテリパック及び電源回路からＦＰＣ２２を介して電力が供給される。このため、それぞれ、ＬＥＤ５２から青色（Ｂ）光が出射される。すると、これらの青色光は、一部が蛍光体５４に含まれる蛍光物質内の電子と衝突することで励起されて蛍光現象を起こし、黄色（Ｙ）成分の光を発生する。 Next, the operation of this embodiment will be described.
In FIG. 1, the mobile phone 1 is turned on. Then, in the linear light emitting device 4 constituting the main part of the planar light emitting device 3 inside the liquid crystal display unit 2 which is the liquid crystal display device shown in FIG. 2, the first light emitting devices 5A to 5A of the light emitting device 5 shown in FIG. Electric power is supplied to the LED 52 provided in the four light emitting devices 5D from the battery pack and the power supply circuit (not shown) via the FPC 22. For this reason, blue (B) light is each radiate | emitted from LED52. Then, some of these blue lights are excited by colliding with electrons in the fluorescent substance contained in the phosphor 54 to cause a fluorescent phenomenon, and light of yellow (Y) component is generated.

（Ｉ）反射しない光について：
そして、これらの光、つまり青色（Ｂ）成分の光と黄色（Ｙ）成分の光は、合成されて白色光となって蛍光体５４内部を進行する。そして、図５に示すように、その進行路がＸ軸方向に平行かこれにほぼ近い光軸方向に進行するものや、光軸方向に対して一定角度範囲内の方向に進行する光は、図６において、反射部材５３で反射されることなくそのまま導光板３１に入射して屈折するとともに、この内部を進行する。 (I) Non-reflecting light:
Then, these lights, that is, the light of the blue (B) component and the light of the yellow (Y) component are combined to become white light and travel through the phosphor 54. As shown in FIG. 5, the light traveling in the direction within a certain angle range with respect to the optical axis direction or the light traveling in the direction of the optical axis parallel to or substantially close to the X-axis direction, as shown in FIG. In FIG. 6, the light enters the light guide plate 31 as it is without being reflected by the reflecting member 53 and is refracted and travels through the inside.

その後、導光板３１を透過して液晶パネル本体２１に直接入射するか、直接反射シート３２（図２参照）で反射された後、再度、導光板３１を透過して液晶パネル本体２１に入射する。また、反射部材５３で反射しない青色（Ｂ）成分の光と黄色（Ｙ）成分の光のうちの一部は、合成される前にそれぞれ単独で蛍光体５４内部を進行し、そのまま導光板３１に入射してから合成されることにより、白色光となって、導光板３１を透過して液晶パネル本体２１に直接入射する。このようにして、導光板３１からの白色光は、液晶表示部２の照明光となり、液晶パネル本体２１内の液晶部分に入射し、表示内容に応じて液晶パネル本体２１から出射して使用者の目に入ることとなる。   Thereafter, the light passes through the light guide plate 31 and directly enters the liquid crystal panel main body 21 or is directly reflected by the reflection sheet 32 (see FIG. 2) and then passes through the light guide plate 31 again and enters the liquid crystal panel main body 21. . In addition, part of the blue (B) component light and the yellow (Y) component light that are not reflected by the reflecting member 53 travels independently in the phosphor 54 before being synthesized, and remains as it is. Are combined with each other to form white light, which passes through the light guide plate 31 and directly enters the liquid crystal panel body 21. In this way, the white light from the light guide plate 31 becomes illumination light of the liquid crystal display unit 2, enters the liquid crystal part in the liquid crystal panel body 21, and exits from the liquid crystal panel body 21 according to the display contents. Will be in the eyes.

（ＩＩ）反射部材５３で反射する光について：
一方、合成されて白色光となって蛍光体５４内部を進行し、その進行路が光軸方向に対して一定角度を越える方向に進行する光は、反射部材５３の反射面Ｒで反射後、蛍光体５４内部での光路の方向が変化して進行する。そして、この光は、蛍光体５４を透過後に導光板３１に入射して屈折するとともに、そのままこの内部を進行する。 (II) Regarding the light reflected by the reflecting member 53:
On the other hand, the light that is synthesized and travels in the phosphor 54 as white light and travels in a direction in which the traveling path exceeds a certain angle with respect to the optical axis direction is reflected by the reflecting surface R of the reflecting member 53, The direction of the optical path inside the phosphor 54 changes and proceeds. Then, after passing through the phosphor 54, the light enters the light guide plate 31 and is refracted, and travels through the inside as it is.

その後、反射部材５３の反射面Ｒで反射せずに導光板３１に入射した光の場合と同様に、導光板３１を透過して液晶パネル本体２１に直接入射するか、直接反射シート３２で反射された後、再度、導光板３１を透過して液晶パネル本体２１に入射することとなる。また、反射部材５３で反射した青色（Ｂ）成分の光または黄色（Ｙ）成分の光のうちの一部は、反射部材５３の反射面Ｒで反射後、合成される前にそれぞれ単独で蛍光体５４内部を進行し、そのまま導光板３１に入射してから合成される。これにより、白色光となって、導光板３１を透過して液晶パネル本体２１に直接入射する。このようにして、導光板３１からの白色光は、液晶表示部２の照明光として液晶パネル本体２１内の液晶部分に入射し、表示内容に応じて液晶パネル本体２１から出射して使用者の目に入ることとなる。   Thereafter, similarly to the case of the light incident on the light guide plate 31 without being reflected by the reflection surface R of the reflection member 53, the light is transmitted through the light guide plate 31 and directly incident on the liquid crystal panel body 21 or directly reflected by the reflection sheet 32. Then, the light passes through the light guide plate 31 again and enters the liquid crystal panel main body 21. Further, part of the blue (B) component light or the yellow (Y) component light reflected by the reflecting member 53 is individually reflected after being reflected by the reflecting surface R of the reflecting member 53 and before being synthesized. After traveling through the body 54 and entering the light guide plate 31 as it is, it is synthesized. As a result, white light is transmitted through the light guide plate 31 and directly enters the liquid crystal panel body 21. In this way, the white light from the light guide plate 31 is incident on the liquid crystal part in the liquid crystal panel body 21 as illumination light of the liquid crystal display unit 2, and is emitted from the liquid crystal panel body 21 in accordance with the display contents to be used by the user. It will be in your eyes.

ところで、本実施形態の線状発光装置４において、第１発光装置５Ａ〜第４発光装置５Ｄのうち、図４に示すように、第１発光装置５Ａ及び第４発光装置５Ｄの反射部材５３の方は、前述したように、それぞれ、両端部寄りに配置した第２反射部材５３２の第２反射面Ｒ２が所定の曲率を有する凹状を呈する。従って、蛍光体５４を透過後に導光板３１の入射端面３１Ａから入射しようとする光は、導光板３１の入射端面３１Ａの両端部近傍付近での入射方向がほぼ垂直となる。   By the way, in the linear light-emitting device 4 of this embodiment, among the 1st light-emitting device 5A-the 4th light-emitting device 5D, as shown in FIG. 4, of the reflective member 53 of 1st light-emitting device 5A and 4th light-emitting device 5D. As described above, the second reflecting surface R2 of the second reflecting member 532 disposed near both ends has a concave shape having a predetermined curvature, as described above. Therefore, the incident light in the vicinity of both end portions of the incident end face 31A of the light guide plate 31 is substantially vertical for light that is about to enter from the incident end face 31A of the light guide plate 31 after passing through the phosphor 54.

このため、蛍光体５４を透過後に導光板３１の入射端面３１Ａから入射できずに導光板３１から漏れる光は、従来に比べると大幅に減少する。従って、導光板３１内部において側端面３１Ｂ，３１Ｃ寄りでの光量増大を図ることもできる。これにより、導光板３１での入射分布の均一化を図ることができるようになる。   For this reason, the light leaking from the light guide plate 31 without being incident from the incident end face 31A of the light guide plate 31 after passing through the phosphor 54 is greatly reduced as compared with the conventional case. Accordingly, it is possible to increase the amount of light near the side end faces 31B and 31C inside the light guide plate 31. Thereby, it is possible to make the incident distribution on the light guide plate 31 uniform.

なお、線状発光装置４の中央側にある第２発光装置５Ｂ及び第３発光装置５Ｃの反射部材５３は、いずれも、左右両側のものが第１反射部材５３１で構成されており、反射面は第１反射面Ｒ１で構成されているので、ＬＥＤ５２から出射して導光板３１の入射端面３１Ａへ向かうときの光をそれぞれ外方側へ偏りのない状態で広がらせることができる。これにより、導光板３１での入射分布にむらが発生するのを回避でき、導光板３１での入射分布の均一化を図ることができる。   Note that both the left and right reflecting members 53 of the second light emitting device 5B and the third light emitting device 5C on the center side of the linear light emitting device 4 are composed of the first reflecting member 531 and the reflecting surface. Since the first reflecting surface R1 is configured, the light emitted from the LED 52 and traveling toward the incident end surface 31A of the light guide plate 31 can be spread outwardly without any bias. Thereby, it is possible to avoid the occurrence of unevenness in the incident distribution on the light guide plate 31, and to make the incident distribution on the light guide plate 31 uniform.

なお、本発明は上述した実施形態に何ら限定されるものではなく、その要旨を逸脱しない範囲において種々の形態で実施し得るものである。   The present invention is not limited to the embodiment described above, and can be implemented in various forms without departing from the gist of the present invention.

本発明の発光装置は、反射部材が、発光素子を挟んだ両側に発光素子を臨む状態で、第１反射面を１対対向配置し、または、第１反射面と第２反射面を対向配置した構成であるとともに、第１反射面は、投光方向に向けて傾斜した平面または少なくとも一部に凸状の面を有し、第２反射面は、少なくとも一部に凹状の面を有するので、輝度の均一性を向上させることができるといった効果を有し、この発光装置を備えた線状発光装置、面状発光装置、液晶表示装置、及び電子機器等に有用である。   In the light emitting device of the present invention, the reflecting member is disposed so that the first reflecting surface faces the light emitting element on both sides of the light emitting element, or the first reflecting surface and the second reflecting surface are opposed to each other. Since the first reflecting surface has a flat surface inclined toward the light projecting direction or at least part of the convex surface, and the second reflecting surface has at least part of the concave surface. It has an effect of improving the uniformity of luminance, and is useful for a linear light emitting device, a planar light emitting device, a liquid crystal display device, an electronic device, and the like provided with this light emitting device.

本発明の実施形態に係る発光装置を備えた液晶表示部を有する携帯電話機を示す斜視図The perspective view which shows the mobile telephone which has a liquid crystal display part provided with the light-emitting device which concerns on embodiment of this invention. 上記携帯電話機の液晶表示部を示す概略断面図Schematic sectional view showing a liquid crystal display part of the mobile phone （Ａ）は図２おける液晶表示部のIII-III線断面図、（Ｂ）はその一部を破断したときの平面図(A) is a cross-sectional view taken along the line III-III of the liquid crystal display portion in FIG. 2, and (B) is a plan view when a part thereof is broken. 本発明の実施形態に係る線状発光装置及びこれを構成する発光装置を示す説明図Explanatory drawing which shows the linear light-emitting device which concerns on embodiment of this invention, and the light-emitting device which comprises this. （Ａ）は本発明の実施形態に係る第１反射面を有する反射部材及び第２反射面を有する反射部材を示す断面図、（Ｂ）は同じく第１反射面を有する反射部材のみを示す断面図(A) is sectional drawing which shows the reflective member which has a 1st reflective surface and the reflective member which has a 2nd reflective surface which concern on embodiment of this invention, (B) is a cross section which shows only the reflective member which similarly has a 1st reflective surface. Figure 本発明の実施形態に係る線状発光装置及びこれを構成する発光装置の作用を示す説明図Explanatory drawing which shows the effect | action of the linear light-emitting device which concerns on embodiment of this invention, and the light-emitting device which comprises this. 従来のバックライト装置を示す断面図Sectional view showing a conventional backlight device

符号の説明Explanation of symbols

１ 携帯電話機
２ 液晶表示部
２１ 液晶パネル本体
２２ フレキシブルプリント基板（ＦＰＣ）
３ 面状発光装置
３１ 導光板（被照明物）
３１Ａ 入射端面
３２ 反射シート
３３ 拡散シート
３４ 集光シート
３５ リムシート
４ 線状発光装置
５ 発光装置
５Ａ〜５Ｄ 第１発光装置〜第４発光装置
５１ 基板
５２ ＬＥＤチップ（発光素子）
５３ 反射部材
５３１ 凸型の反射部材（第１反射部材）
５３２ 凹型の反射部材（第２反射部材）
５４ 蛍光体
Ｒ 反射面
Ｒ１ 凸状を呈する反射面（第１反射面）
Ｒ２ 凹状を呈する反射面（第２反射面） DESCRIPTION OF SYMBOLS 1 Mobile phone 2 Liquid crystal display part 21 Liquid crystal panel main body 22 Flexible printed circuit board (FPC)
3 Planar light emitting device 31 Light guide plate (illuminated object)
31A Incident end face 32 Reflective sheet 33 Diffusion sheet 34 Condensing sheet 35 Rim sheet 4 Linear light emitting device 5 Light emitting device 5A to 5D First light emitting device to fourth light emitting device 51 Substrate 52 LED chip (light emitting element)
53 Reflective member 531 Convex reflective member (first reflective member)
532 Recessed reflection member (second reflection member)
54 Phosphor R Reflective Surface R1 Convex reflective surface (first reflective surface)
R2 concave reflecting surface (second reflecting surface)

Claims (5)

基材と、
前記基材に搭載され、光を発する発光素子と、
凸状の面を有し、前記光を反射する第１反射面を持ち、前記基材に搭載された第１反射部材と、
凹状の面を有し、前記光を反射する第２反射面を持ち、前記発光素子を基準に前記第１反射部材と反対側の位置で、前記基材に搭載された第２反射部材と、
を備え、
前記光を直接的に被照明物に投光し、前記第１反射面で反射した光を光照明物に投光し、前記第２反射面で反射した光を被照明物に投光する発光装置。 A substrate;
A light emitting element mounted on the substrate and emitting light;
A first reflective member having a convex surface, having a first reflective surface for reflecting the light, and mounted on the substrate;
A second reflecting member that has a concave surface, has a second reflecting surface that reflects the light, and is mounted on the substrate at a position opposite to the first reflecting member with respect to the light emitting element;
With
Light emission that projects the light directly onto the object to be illuminated, projects the light reflected by the first reflecting surface onto the object to be illuminated, and projects the light reflected by the second reflecting surface onto the object to be illuminated. apparatus. 直線の上に配置された、請求項１に記載の第１の発光装置と、
前記直線の上に配置された、請求項１に記載の第２の発光装置と、
を備え、
前記第１の発光装置の第２反射面が前記直線の方向の外側に配置され、
前記第２の発光装置の第２反射面が前記直線の方向の外側に配置される線状発光装置。 Disposed on the straight line, and the first light-emitting device according to claim 1,
Disposed on the straight line, and the second light-emitting device according to claim 1,
With
A second reflecting surface of the first light emitting device is disposed outside the direction of the straight line;
A linear light-emitting device in which a second reflecting surface of the second light-emitting device is disposed outside in the direction of the straight line. 請求項２に記載の線状発光装置と、当該線状発光装置からの光を端面から入射するように前記線状発光装置と対向配置する導光板とを備えた面状発光装置。 A planar light-emitting device comprising: the linear light-emitting device according to claim 2; and a light guide plate disposed opposite to the linear light-emitting device so that light from the linear light-emitting device is incident from an end surface. 請求項３に記載の面状発光装置と、当該面状発光装置に積層配置する液晶パネルとを備えた液晶表示装置。 A liquid crystal display device comprising: the planar light emitting device according to claim 3; and a liquid crystal panel that is stacked on the planar light emitting device. 請求項４に記載の液晶表示装置を含む電子機器。 An electronic apparatus comprising the liquid crystal display device according to claim 4 .
JP2007094570A 2007-03-30 2007-03-30 Light emitting device, linear light emitting device, planar light emitting device, liquid crystal display device, and electronic apparatus Expired - Fee Related JP4815381B2 (en)

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JP2010171294A (en) * 2009-01-26 2010-08-05 Rohm Co Ltd Light-emitting device
JP2011181794A (en) * 2010-03-03 2011-09-15 Panasonic Corp Light emitting device and back light module using the same
JP2011228137A (en) * 2010-04-20 2011-11-10 Panasonic Corp Lighting system and display device
JP5975374B2 (en) * 2012-01-13 2016-08-23 パナソニックＩｐマネジメント株式会社 Guide light
WO2014068804A1 (en) * 2012-10-31 2014-05-08 パナソニック株式会社 Light emitting apparatus and method for manufacturing same
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JP2006221923A (en) * 2005-02-09 2006-08-24 Mitsubishi Rayon Co Ltd Led surface light source device
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