JPH08220344A - Planar light source and non-light-emitting display device - Google Patents
Planar light source and non-light-emitting display deviceInfo
- Publication number
- JPH08220344A JPH08220344A JP7026937A JP2693795A JPH08220344A JP H08220344 A JPH08220344 A JP H08220344A JP 7026937 A JP7026937 A JP 7026937A JP 2693795 A JP2693795 A JP 2693795A JP H08220344 A JPH08220344 A JP H08220344A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- guide plate
- light guide
- flat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Liquid Crystal (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、平面光を得るための平
面光源及び平面光源を使用してなる非発光型表示装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat light source for obtaining flat light and a non-emissive display device using the flat light source.
【０００２】[0002]
【従来の技術】従来、液晶表示装置に使用される平面光
源として、例えば、図１１にその概略的断面図を示すよ
うなものが提案されている。2. Description of the Related Art Conventionally, as a flat light source used in a liquid crystal display device, for example, one having a schematic cross-sectional view shown in FIG. 11 has been proposed.
【０００３】図１１中、１は線光源をなす冷陰極管、２
は冷陰極管１を保持するホルダー、３はアクリル樹脂な
どの透明樹脂からなる導光板、４、５は導光板３側を反
射面とする反射板、６は拡散板である。In FIG. 11, reference numeral 1 is a cold cathode tube which forms a linear light source, and 2
Is a holder for holding the cold cathode tube 1, 3 is a light guide plate made of a transparent resin such as acrylic resin, 4 and 5 are reflection plates having a reflection surface on the light guide plate 3 side, and 6 is a diffusion plate.
【０００４】ここに、導光板３は、端面３Ａを入射面、
裏面３Ｂを反射面、表面３Ｃを出射面とされており、表
面３Ｃを平面とし、裏面３Ｂにはプリズムアレイが形成
されている。Here, the light guide plate 3 has an end surface 3A as an incident surface,
The back surface 3B is a reflecting surface, the front surface 3C is an emitting surface, the front surface 3C is a flat surface, and a prism array is formed on the back surface 3B.
【０００５】即ち、この平面光源は、冷陰極管１から出
射させた光７を端面３Ａから導光板３に入射させ、この
光７を導光板３の裏面３Ｂで反射させて拡散板６に導い
て、一定の指向特性を有する平面光を出射するというも
のである。That is, in this flat light source, the light 7 emitted from the cold cathode fluorescent lamp 1 is made incident on the light guide plate 3 from the end face 3A, and the light 7 is reflected by the back surface 3B of the light guide plate 3 and guided to the diffusion plate 6. Then, plane light having a certain directional characteristic is emitted.
【０００６】[0006]
【発明が解決しようとする課題】しかし、この平面光源
においては、光の利用効率が４０％程度と低いため、輝
度が低く、これを、例えば、液晶表示装置に使用する場
合には、鮮明な明るい画面を得ることができないという
問題点があった。However, in this flat light source, since the utilization efficiency of light is as low as about 40%, the brightness is low, and when it is used for a liquid crystal display device, for example, it is clear. There was a problem that a bright screen could not be obtained.
【０００７】本発明は、かかる点に鑑み、光の利用効率
を高くし、輝度の高い平面光を得ることができるように
した平面光源を提供することを第１の目的とし、鮮明な
明るい画面を得ることができるようにした非発光型表示
装置を提供することを第２の目的とする。In view of the above points, the first object of the present invention is to provide a flat light source capable of obtaining high-luminance flat light with high light utilization efficiency. A second object of the present invention is to provide a non-emissive display device capable of obtaining the above-mentioned.
【０００８】[0008]
【課題を解決するための手段】本発明の平面光源は、表
面を平面とし、裏面に、前記表面と平行する第１の仮想
平面内に存在する頂線と、表面と平行する第２の仮想平
面内に存在する谷線とが、平行、かつ、交互に形成され
てなるプリズムアレイを形成し、一又は複数の端面から
入射される光を表面から出射する導光板と、この導光板
の一又は複数の端面に光を入射する線光源とを有してな
る平面光源において、導光板の裏面側に、線光源からの
光が入射される一又は複数の端面から遠ざかるに従い、
単位面積あたりの拡散乱反射面積が大となるように、拡
散乱反射部を設けるというものである。A planar light source according to the present invention has a front surface as a flat surface and a back surface having a top line existing in a first virtual plane parallel to the front surface and a second virtual surface parallel to the front surface. A light guide plate that forms a prism array in which valley lines existing in a plane are formed in parallel and alternately and that emits light incident from one or a plurality of end faces from the surface, and one of the light guide plates. Or, in a planar light source having a linear light source that makes light incident on a plurality of end surfaces, on the back surface side of the light guide plate, as the light from the linear light source is incident away from one or a plurality of end surfaces,
The diffuse irregular reflection portion is provided so that the diffuse irregular reflection area per unit area becomes large.
【０００９】本発明の非発光型表示装置は、本発明の平
面光源の光出射面側に非発光型表示パネルを配置させる
というものである。The non-emissive display device of the present invention is such that the non-emissive display panel is arranged on the light emission surface side of the flat light source of the present invention.
【００１０】[0010]
【作用】本発明の平面光源においては、導光板の裏面側
に拡散乱反射部を設けるとしていることから、導光板の
裏面から漏れてしまう光を減らすことができ、その分、
光出射面から出射される平面光の輝度を高めることがで
きる。In the flat light source of the present invention, since the diffuse diffuse reflection portion is provided on the back surface side of the light guide plate, the light leaking from the back surface of the light guide plate can be reduced.
It is possible to increase the brightness of the plane light emitted from the light emitting surface.
【００１１】ここに、拡散乱反射部は、線光源からの光
が入射される一又は複数の端面から遠ざかるに従い、単
位面積あたりの拡散乱反射面積が大となるように設けら
れるので、光出射面のうち、線光源から遠い部分の輝度
が他の部分よりも低くなってしまうことを避けることが
できる。Here, since the diffuse irregular reflection portion is provided so that the diffuse irregular reflection area per unit area increases as the distance from the one or a plurality of end faces on which the light from the linear light source is incident increases, It is possible to avoid that the luminance of the portion far from the linear light source becomes lower than that of other portions.
【００１２】また、本発明の非発光型表示装置において
は、本発明の平面光源の光出射面側に非発光型表示パネ
ルを配置させるとしているが、本発明の平面光源は、光
出射面から出射される平面光の輝度が高いので、鮮明な
明るい画面を得ることができる。In the non-emissive display device of the present invention, the non-emissive display panel is arranged on the light emitting surface side of the flat light source of the present invention. Since the brightness of the emitted plane light is high, a clear bright screen can be obtained.
【００１３】[0013]
【実施例】以下、図１〜図１０を参照して、本発明の平
面光源の第１実施例、第２実施例及び本発明の非発光型
表示装置の第１実施例、第２実施例について説明する。1 to 10, the first and second embodiments of the flat light source of the present invention and the first and second embodiments of the non-emissive display device of the present invention will be described below. Will be described.
【００１４】本発明の平面光源の第１実施例・・図１〜
図５ 図１は本発明の平面光源の第１実施例を示す概略的平面
図、図２は図１に示すＡ−Ａ線に沿った概略的断面図で
ある。First Embodiment of Flat Light Source of the Present Invention
FIG. 5 is a schematic plan view showing a first embodiment of the flat light source of the present invention, and FIG. 2 is a schematic sectional view taken along the line AA shown in FIG.
【００１５】これら図１、図２において、１０はＬ字形
の冷陰極管であり、１０Ａは冷陰極管１０の長方向部
分、１０Ｂは冷陰極管１０の短方向部分である。In FIGS. 1 and 2, 10 is an L-shaped cold cathode tube, 10A is a long-side portion of the cold cathode tube 10, and 10B is a short-side portion of the cold cathode tube 10.
【００１６】この冷陰極管１０は、管径＝３.０［ｍ
ｍ］、発光長＝１５７［ｍｍ］（長方向部分１０Ａ＝８
９［ｍｍ］、短方向部分１０Ｂ＝６８［ｍｍ］）、入力
電力＝２.１４［Ｗ］、輝度＝２２２６０［ｃｄ／
ｍ2］、光束＝６９１［ｌｍ］とするものである。The cold cathode tube 10 has a tube diameter of 3.0 [m
m], emission length = 157 [mm] (longitudinal portion 10A = 8)
9 [mm], short direction portion 10B = 68 [mm]), input power = 2.14 [W], brightness = 22260 [cd /
m 2 ], luminous flux = 691 [lm].
【００１７】また、１１は冷陰極管１０を保持するホル
ダーであり、このホルダー１１の内側面１１Ａは、光反
射処理が施されており、冷陰極管１０から照射される光
を効率良く反射できるようにされている。Reference numeral 11 denotes a holder for holding the cold cathode fluorescent lamp 10. An inner side surface 11A of the holder 11 is light-reflected so that the light emitted from the cold cathode fluorescent lamp 10 can be efficiently reflected. Is being done.
【００１８】なお、ホルダー１１の内側面１１Ａの光反
射処理は、銀や、アルミニウム等を蒸着させることによ
り行うことができる。The light reflection treatment of the inner surface 11A of the holder 11 can be performed by vapor deposition of silver, aluminum or the like.
【００１９】また、１２は透明なアクリル樹脂からなる
導光板であり、この導光板１２は、厚さ＝３.５［ｍ
ｍ］、有効発光面積＝８２［ｍｍ］×６２［ｍｍ］とさ
れており、表面１２Ａを平面とし、裏面１２Ｂにプリズ
ムアレイが形成されている。Reference numeral 12 is a light guide plate made of transparent acrylic resin, and the thickness of the light guide plate 12 is 3.5 [m].
m], effective light emitting area = 82 [mm] × 62 [mm], the front surface 12A is a flat surface, and the prism array is formed on the back surface 12B.
【００２０】即ち、この導光板１２は、表面１２Ａを光
出射面、裏面１２Ｂを光反射面とするものである。That is, the light guide plate 12 has the front surface 12A as a light emitting surface and the back surface 12B as a light reflecting surface.
【００２１】このプリズムアレイは、表面１２Ａと平行
する第１の仮想平面内に存在する頂線１５と、表面１２
Ａと平行する第２の仮想平面内に存在する谷線１６と
を、平行、かつ、交互に形成することにより構成されて
いる。This prism array has a top line 15 existing in a first imaginary plane parallel to the surface 12A and the surface 12
It is configured by forming A and a valley line 16 existing in a second virtual plane parallel to each other in parallel and alternately.
【００２２】図３は、これら頂線１５及び谷線１６の延
在方向を示す概略的平面図であり、頂線１５及び谷線１
６は、冷陰極管１０の長方向部分１０Ａに対して３０°
の角度をなすように形成されている。FIG. 3 is a schematic plan view showing the extending direction of the top line 15 and the valley line 16. The top line 15 and the valley line 1 are shown in FIG.
6 is 30 ° with respect to the longitudinal portion 10A of the cold cathode tube 10.
Is formed so as to form an angle.
【００２３】また、図４は図３に示すＢ−Ｂ線（図上、
頂線１５及び谷線１６に直交する線）に沿った導光板１
２の概略的断面図であり、図４中、１８は頂線１５が含
まれる仮想平面、１９は谷線１６が含まれる仮想平面で
ある。Further, FIG. 4 is a line BB shown in FIG. 3 (in the figure,
A light guide plate 1 along a line orthogonal to the top line 15 and the valley line 16)
2 is a schematic cross-sectional view of FIG. 4, and in FIG. 4, 18 is an imaginary plane including the top line 15 and 19 is an imaginary plane including the valley line 16.
【００２４】また、２０は導光板１２内を伝播する光を
反射して表面１２Ａから出射する役目を有するプリズム
面、２１は導光板１２内を伝播する光を反射して前進さ
せる役目を有するプリズム面である。Reference numeral 20 denotes a prism surface having a role of reflecting the light propagating in the light guide plate 12 and emitting it from the surface 12A, and 21 a prism having a role of reflecting the light propagating in the light guide plate 12 and advancing it. The surface.
【００２５】ここに、プリズム面２０の仮想平面１８に
対する傾斜角αは、プリズム面２１の仮想平面１８に対
する傾斜角βよりも大とすることが好適であり、特に、
プリズム面２０の仮想平面１８に対する傾斜角αは、３
０°〜４８°とすることが好適であり、プリズム面２１
の仮想平面１８に対する傾斜角βは、２°〜３°とする
ことが好適である。Here, the inclination angle α of the prism surface 20 with respect to the virtual plane 18 is preferably larger than the inclination angle β of the prism surface 21 with respect to the virtual plane 18, and in particular,
The inclination angle α of the prism surface 20 with respect to the virtual plane 18 is 3
It is preferable that the angle is 0 ° to 48 °, and the prism surface 21
The inclination angle β with respect to the virtual plane 18 is preferably 2 ° to 3 °.
【００２６】本実施例の平面光源においては、プリズム
面２０の仮想平面１８に対する傾斜角αは４０°とさ
れ、プリズム面２１の仮想平面１８に対する傾斜角βは
３°とされている。In the flat light source of this embodiment, the inclination angle α of the prism surface 20 with respect to the virtual plane 18 is 40 °, and the inclination angle β of the prism surface 21 with respect to the virtual plane 18 is 3 °.
【００２７】また、図２において、２３は導光板１２の
裏面１２Ｂにシルク印刷により形成されたドット状の白
色塗料層であり、導光板１２の裏面１２Ｂ側の面を拡散
乱反射面とするものである。Further, in FIG. 2, numeral 23 is a dot-shaped white paint layer formed by silk printing on the back surface 12B of the light guide plate 12, and the surface on the back surface 12B side of the light guide plate 12 is a diffuse diffuse reflection surface. is there.
【００２８】ここに、図５は白色塗料層２３の分布状態
を示す概略的平面図であり、この例では、導光板１２の
冷陰極管１０の長方向部分１０Ａ側の端面１２ＤからＹ
方向に遠ざかるに従い、また、導光板１２の冷陰極管１
０の短方向部分１０Ｂ側の端面１２ＥからＸ方向に遠ざ
かるに従い、拡散乱反射面積の大きい白色塗料層２３が
形成されることにより、導光板１２の冷陰極管１０の長
方向部分１０Ａ側の端面１２ＤからＹ方向に遠ざかるに
従い、また、導光板１２の冷陰極管１０の短方向部分１
０Ｂ側の端面１２ＥからＸ方向に遠ざかるに従い、単位
面積あたりの拡散乱反射面積が大となるようにされてい
る。FIG. 5 is a schematic plan view showing the distribution state of the white paint layer 23. In this example, the end face 12D to Y of the light guide plate 12 on the longitudinal portion 10A side of the cold cathode fluorescent lamp 10 is shown.
As the distance increases, the cold cathode tube 1 of the light guide plate 12
The white paint layer 23 having a large diffused and diffused reflection area is formed as the distance from the end surface 12E on the short direction portion 10B side of 0 in the X direction is increased, so that the end surface 12D on the long direction portion 10A side of the cold cathode tube 10 of the light guide plate 12 is formed. Away from the Y direction, the short direction portion 1 of the cold cathode tube 10 of the light guide plate 12
The diffuse diffuse reflection area per unit area is increased as the distance from the end surface 12E on the 0B side is increased in the X direction.
【００２９】また、図２において、２５、２６は導光板
１２側を反射面とする反射板、２７は拡散板である。Further, in FIG. 2, reference numerals 25 and 26 are reflection plates having a reflection surface on the light guide plate 12 side, and 27 is a diffusion plate.
【００３０】本発明の平面光源の第１実施例において
は、冷陰極管１０から出射された光２８は、直接又はホ
ルダー１１の内側面１１Ａで反射し、端面１２Ｄ、１２
Ｅから導光板１２に入射し、導光板１２内を伝播し、導
光板１２の裏面１２Ｂのプリズム面２０で反射して拡散
板２７に伝播し、一定の指向特性を有する平面光として
出射する。In the first embodiment of the flat light source of the present invention, the light 28 emitted from the cold cathode fluorescent lamp 10 is reflected directly or on the inner surface 11A of the holder 11, and the end surfaces 12D, 12 are formed.
The light enters from E to the light guide plate 12, propagates in the light guide plate 12, is reflected by the prism surface 20 of the back surface 12B of the light guide plate 12, propagates to the diffusion plate 27, and is emitted as plane light having a certain directional characteristic.
【００３１】ここに、本発明の平面光源の第１実施例に
おいては、導光板１２の裏面１２Ｂにシルク印刷により
ドット状の白色塗料層２３が形成され、白色塗料層２３
の導光板１２の裏面１２Ｂ側の面を拡散乱反射面とされ
ているので、導光板１２の裏面１２Ｂから反射板２５側
に漏れてしまう光の量を減らし、拡散板２７から出射さ
せる平面光の輝度を高めることができる。Here, in the first embodiment of the flat light source of the present invention, the dot-shaped white paint layer 23 is formed on the back surface 12B of the light guide plate 12 by silk printing, and the white paint layer 23 is formed.
Since the surface on the back surface 12B side of the light guide plate 12 is a diffuse diffuse reflection surface, the amount of light leaking from the back surface 12B of the light guide plate 12 to the reflection plate 25 side is reduced, and the planar light emitted from the diffusion plate 27 is reduced. The brightness can be increased.
【００３２】ちなみに、表１は、本発明の平面光源の第
１実施例により得られる平面光の輝度と、図６に示す第
１比較例により得られる平面光の輝度と、図７に示す第
２比較例により得られる平面光の輝度とを比較するもの
である。By the way, Table 1 shows the luminance of the plane light obtained by the first embodiment of the flat light source of the present invention, the luminance of the plane light obtained by the first comparative example shown in FIG. 6, and the luminance shown in FIG. 2 It is to compare the brightness of the plane light obtained by the comparative example.
【００３３】[0033]
【表１】 [Table 1]
【００３４】ここに、第１比較例は、白色塗料層２３を
形成せず、その他については、本発明の平面光源の第１
実施例と同様に構成したものである。Here, in the first comparative example, the white paint layer 23 was not formed, and in the other cases, the first comparative example of the flat light source of the present invention was used.
The configuration is similar to that of the embodiment.
【００３５】また、第２比較例は、白色塗料層２３を形
成せず、かつ、拡散板２７上に、光出射面の法線方向の
輝度を高めるための光制御板としてプリズムアレイフィ
ルム３０を配置し、その他については、本発明の平面光
源の第１実施例と同様に構成したものである。In the second comparative example, the prism array film 30 is not formed on the white paint layer 23 and is a light control plate on the diffusion plate 27 as a light control plate for increasing the brightness in the normal direction of the light emitting surface. The arrangement and other points are the same as those of the first embodiment of the flat light source of the present invention.
【００３６】なお、平均輝度の測定は、光出射面の有効
発光部を、横方向を３分割、縦方向を３分割してなる９
個の領域に分割し、これら９個の領域の中心の輝度を平
均するという方法で行っている。The average luminance is measured by dividing the effective light emitting portion of the light emitting surface into three in the horizontal direction and three in the vertical direction.
This is done by a method of dividing into nine areas and averaging the brightness at the center of these nine areas.
【００３７】また、本発明の平面光源の第１実施例にお
いては、白色塗料層２３は、導光板１２の冷陰極管１０
の長方向部分１０Ａ側の端面１２ＤからＹ方向に遠ざか
るに従い、また、導光板１２の冷陰極管１０の短方向部
分１０Ｂ側の端面１２ＥからＸ方向に遠ざかるに従い、
白色塗料層２３による単位面積あたりの拡散乱反射面積
が大となるようにされているので、出射面のうち、冷陰
極管１０から遠い部分の輝度が他の部分よりも低くなっ
てしまうことを避けることができる。Further, in the first embodiment of the flat light source of the present invention, the white paint layer 23 is the cold cathode fluorescent lamp 10 of the light guide plate 12.
As the distance from the end face 12D on the long direction portion 10A side in the Y direction increases, and from the end face 12E on the short direction portion 10B side of the cold cathode tube 10 of the light guide plate 12 in the X direction,
Since the diffused diffused reflection area per unit area by the white paint layer 23 is made large, it is possible to avoid that the brightness of the part of the emission surface far from the cold cathode tube 10 becomes lower than other parts. be able to.
【００３８】このように、本発明の平面光源の第１実施
例によれば、第１比較例及び第２比較例よりも輝度の高
い平面光を得ることができ、しかも、出射面のうち、冷
陰極管１０から遠い部分の輝度が他の部分よりも低くな
ってしまうことを避けることができるので、これを、例
えば、液晶表示装置に使用する場合には、鮮明な明るい
画面を得ることができる。As described above, according to the first embodiment of the flat light source of the present invention, it is possible to obtain flat light having a higher brightness than those of the first and second comparative examples, and moreover, of the emitting surfaces, Since it is possible to avoid that the brightness of the part far from the cold-cathode tube 10 becomes lower than that of the other part, it is possible to obtain a clear and bright screen when using this for a liquid crystal display device, for example. it can.
【００３９】本発明の平面光源の第２実施例・・図８ 図８は本発明の平面光源の第２実施例を示す概略的断面
図であり、本発明の平面光源の第２実施例は、拡散板２
７上にプリズムアレイフィルム３０を配置し、その他に
ついては、本発明の平面光源の第１実施例と同様に構成
したものである。Second Embodiment of Flat Light Source According to the Present Invention FIG. 8 is a schematic sectional view showing a second embodiment of the flat light source according to the present invention. The second embodiment of the flat light source according to the present invention is shown in FIG. , Diffuser 2
The prism array film 30 is arranged on the surface of the light source 7, and the others are configured similarly to the first embodiment of the flat light source of the present invention.
【００４０】本発明の平面光源の第２実施例において
は、冷陰極管１０から出射された光２８は、直接又はホ
ルダー１１の内側面１１Ａで反射して、端面１２Ｄ、１
２Ｅから導光板１２に入射し、導光板１２内を伝播し、
導光板１２の裏面１２Ｂのプリズム面２０で反射して拡
散板２７に伝播し、プリズムアレイフィルム３０を介し
て、一定の指向特性を有する平面光として出射する。In the second embodiment of the flat light source of the present invention, the light 28 emitted from the cold cathode fluorescent lamp 10 is reflected directly or on the inner side surface 11A of the holder 11, and the end surfaces 12D, 1
The light enters the light guide plate 12 from 2E, propagates in the light guide plate 12,
The light is reflected by the prism surface 20 on the back surface 12B of the light guide plate 12, propagates to the diffusion plate 27, and is emitted as planar light having a certain directivity characteristic through the prism array film 30.
【００４１】ここに、本発明の平面光源の第２実施例に
おいても、導光板１２の裏面１２Ｂにシルク印刷により
白色塗料層２３が形成され、白色塗料層２３の導光板１
２の裏面１２Ｂ側の面を拡散乱反射面とされているの
で、導光板１２の裏面１２Ｂから反射板２５側に漏れて
しまう光の量を減らし、拡散板２７から出射される平面
光の輝度を高めることができる。Here, also in the second embodiment of the flat light source of the present invention, the white paint layer 23 is formed on the back surface 12B of the light guide plate 12 by silk printing, and the light guide plate 1 of the white paint layer 23 is formed.
Since the surface on the back surface 12B side of 2 is a diffuse diffuse reflection surface, the amount of light leaking from the back surface 12B of the light guide plate 12 to the reflection plate 25 side is reduced, and the brightness of the plane light emitted from the diffusion plate 27 is reduced. Can be increased.
【００４２】また、特に、本発明の平面光源の第２実施
例においては、拡散板２７上にプリズムアレイフィルム
３０が配置されているので、本発明の平面光源の第１実
施例の場合よりも、光出射面の法線方向の指向性が強ま
り、その分、本発明の平面光源の第１実施例の場合より
も、平面光の輝度が高くなる。Further, in particular, in the second embodiment of the flat light source of the present invention, since the prism array film 30 is arranged on the diffusion plate 27, it is more than in the first embodiment of the flat light source of the present invention. The directivity of the light emitting surface in the normal direction is enhanced, and the brightness of the plane light is higher than that in the first embodiment of the plane light source of the present invention.
【００４３】ちなみに、表２は、本発明の平面光源の第
２実施例により得られる平面光の輝度と、図６に示す第
１比較例により得られる平面光の輝度と、図７に示す第
２比較例により得られる平面光の輝度と、本発明の平面
光源の第１実施例により得られる平面光の輝度とを比較
するものであり、平均輝度の測定は、本発明の平面光源
の第１実施例の場合と同様にしている。Incidentally, Table 2 shows the luminance of the plane light obtained by the second embodiment of the flat light source of the present invention, the luminance of the plane light obtained by the first comparative example shown in FIG. 6, and the number shown in FIG. 2 is to compare the luminance of the plane light obtained by the comparative example with the luminance of the plane light obtained by the first example of the flat light source of the present invention, and the average luminance is measured by It is similar to the case of the first embodiment.
【００４４】[0044]
【表２】 [Table 2]
【００４５】また、本発明の平面光源の第２実施例にお
いても、白色塗料層２３は、導光板１２の冷陰極管１０
の長方向部分１０Ａ側の端面１２ＤからＹ方向に遠ざか
るに従い、また、導光板１２の冷陰極管１０の短方向部
分１０Ｂ側の端面１２ＥからＸ方向に遠ざかるに従い、
白色塗料層２３による単位面積あたりの拡散乱反射面積
が大となるようにされているので、出射面のうち、冷陰
極管１０から遠い部分の輝度が他の部分よりも低くなっ
てしまうことを避けることができる。Also in the second embodiment of the flat light source of the present invention, the white paint layer 23 is used for the cold cathode fluorescent lamp 10 of the light guide plate 12.
As the distance from the end face 12D on the long direction portion 10A side in the Y direction increases, and from the end face 12E on the short direction portion 10B side of the cold cathode tube 10 of the light guide plate 12 in the X direction,
Since the diffused diffused reflection area per unit area by the white paint layer 23 is made large, it is possible to avoid that the brightness of the part of the emission surface far from the cold cathode tube 10 becomes lower than other parts. be able to.
【００４６】このように、本発明の平面光源の第２実施
例によれば、本発明の平面光源の第１実施例よりも輝度
の高い平面光を得ることができ、しかも、光出射面のう
ち、冷陰極管１０から遠い部分の輝度が他の部分よりも
低くなってしまうことを避けることができるので、これ
を、例えば、液晶表示装置に使用する場合には、鮮明な
明るい画面を得ることができる。As described above, according to the second embodiment of the flat light source of the present invention, it is possible to obtain flat light having a higher brightness than that of the first embodiment of the flat light source of the present invention, and moreover, it is possible to obtain the light emitting surface. Of these, it is possible to avoid that the brightness of the part far from the cold cathode fluorescent lamp 10 becomes lower than the brightness of other parts, so that when this is used for a liquid crystal display device, for example, a clear bright screen is obtained. be able to.
【００４７】なお、本発明の平面光源の第２実施例にお
いては、拡散板２７上にプリズムアレイフィルム３０を
配置した場合について説明したが、このプリズムアレイ
フィルム３０は、導光板１２と拡散板２７との間に配置
させるようにしても良い。In the second embodiment of the flat light source of the present invention, the case where the prism array film 30 is arranged on the diffusion plate 27 has been described, but the prism array film 30 includes the light guide plate 12 and the diffusion plate 27. It may be arranged between and.
【００４８】また、本発明の平面光源の第１実施例及び
第２実施例においては、拡散乱反射部として白色塗料層
２３をシルク印刷により形成した場合について説明した
が、拡散乱反射部は、導光板１２の裏側１２Ｂに粗面加
工により形成するようにしても良い。Further, in the first and second embodiments of the flat light source of the present invention, the case where the white paint layer 23 is formed by silk printing as the diffuse irregular reflection portion has been described, but the diffuse irregular reflection portion is a light guide plate. It may be formed on the back side 12B of 12 by roughening.
【００４９】また、本発明の平面光源の第１実施例及び
第２実施例においては、本発明をＬ字形の冷陰極管１０
を使用した片側点灯方式の平面光源に適用した場合につ
いて説明したが、本発明は、直管式の冷陰極管を使用し
た片側点灯方式の平面光源や、Ｌ字形の冷陰極管又は直
管式の冷陰極管を使用した両側点灯方式の平面光源にも
適用することができる。In addition, in the first and second embodiments of the flat light source of the present invention, the present invention is an L-shaped cold cathode fluorescent lamp 10.
The present invention has been described as applied to a one-sided lighting type planar light source, but the present invention is directed to a one-sided lighting type planar light source using a straight tube cold cathode tube, an L-shaped cold cathode tube or a straight tube type. It can also be applied to a two-sided lighting type flat light source using the cold cathode tube.
【００５０】本発明の非発光型表示装置の第１実施例・
・図９ 図９は本発明の非発光型表示装置の第１実施例の要部を
示す概略的断面図であり、本実施例は、本発明の非発光
型表示装置を透過型の液晶表示装置に適用した一例であ
る。First Embodiment of Non-emissive Display Device of the Present Invention
FIG. 9 is a schematic cross-sectional view showing the main part of the first embodiment of the non-emissive display device of the present invention. This embodiment shows a transmissive liquid crystal display of the non-emissive display device of the present invention. It is an example applied to a device.
【００５１】本実施例の液晶表示装置は、本発明の平面
光源の第１実施例を使用してなるものであり、図９中、
３２は本発明の平面光源の第１実施例、３３は透過型の
液晶表示パネルである。The liquid crystal display device of this embodiment uses the first embodiment of the flat light source of the present invention, and in FIG.
32 is a first embodiment of the flat light source of the present invention, and 33 is a transmissive liquid crystal display panel.
【００５２】即ち、本実施例の液晶表示装置は、本発明
の平面光源の第１実施例３２の光出射面側に透過型の液
晶表示パネル３３を配置するというものである。That is, in the liquid crystal display device of the present embodiment, the transmissive liquid crystal display panel 33 is arranged on the light emitting surface side of the first embodiment 32 of the flat light source of the present invention.
【００５３】このように、本実施例の液晶表示装置によ
れば、本発明の平面光源の第１実施例３２を使用してい
るが、本発明の平面光源の第１実施例３２は、第１比較
例及び第２比較例よりも輝度の高い平面光を得ることが
できるように構成されているので、第１比較例又は第２
比較例を使用する場合よりも鮮明な明るい画面を得るこ
とができる。As described above, according to the liquid crystal display device of the present embodiment, the first embodiment 32 of the flat light source of the present invention is used, but the first embodiment 32 of the flat light source of the present invention is The first comparative example or the second comparative example is configured to be able to obtain plane light with higher brightness than the first comparative example and the second comparative example.
A clear and bright screen can be obtained as compared with the case of using the comparative example.
【００５４】本発明の非発光型表示装置の第２実施例・
・図１０ 図１０は本発明の非発光型表示装置の第２実施例の要部
を示す概略的断面図であり、本実施例は、本発明の非発
光型表示装置を透過型の液晶表示装置に適用した他の例
である。Second Embodiment of Non-emissive Display Device of the Present Invention
FIG. 10 is a schematic cross-sectional view showing a main part of a second embodiment of the non-emissive display device of the present invention. In this embodiment, the non-emissive display device of the present invention is a transmissive liquid crystal display. It is another example applied to the apparatus.
【００５５】本実施例の液晶表示装置は、本発明の平面
光源の第２実施例を使用してなるものであり、図１０
中、３５は本発明の平面光源の第２実施例、３６は透過
型の液晶表示パネルである。The liquid crystal display device of this embodiment uses the flat light source of the second embodiment of the present invention.
Reference numeral 35 is a second embodiment of the flat light source of the present invention, and 36 is a transmissive liquid crystal display panel.
【００５６】即ち、本実施例の液晶表示装置は、本発明
の平面光源の第２実施例３５の光出射面側に透過型の液
晶表示パネル３６を配置するというものである。That is, in the liquid crystal display device of the present embodiment, the transmissive liquid crystal display panel 36 is arranged on the light emission surface side of the second embodiment 35 of the flat light source of the present invention.
【００５７】このように、本実施例の液晶表示装置によ
れば、本発明の平面光源の第２実施例３５を使用してい
るが、本発明の平面光源の第２実施例３５は、本発明の
平面光源の第１実施例３２よりも輝度の高い平面光を得
ることができるように構成されているので、本発明の平
面光源の第１実施例３２を使用する場合よりも鮮明な明
るい画面を得ることができる。As described above, according to the liquid crystal display device of the present embodiment, the second embodiment 35 of the flat light source of the present invention is used, but the second embodiment 35 of the flat light source of the present invention is The flat light source of the present invention is configured so as to obtain a plane light having a higher brightness than that of the first embodiment 32 of the present invention. Therefore, it is clearer and brighter than the case of using the first embodiment 32 of the flat light source of the present invention. You can get the screen.
【００５８】[0058]
【発明の効果】以上のように、本発明の平面光源によれ
ば、導光板の裏面側に、線光源からの光が入射される一
又は複数の端面から遠ざかるに従い、単位面積あたりの
拡散乱反射面積が大となるように、拡散乱反射部を設け
るとしたことにより、光出射面から出射される平面光の
輝度を高めることができる。As described above, according to the flat light source of the present invention, the diffused irregular reflection per unit area is caused on the back surface side of the light guide plate as the distance from the one or more end faces on which the light from the linear light source is incident increases. By providing the diffuse irregular reflection portion so that the area becomes large, the brightness of the plane light emitted from the light emitting surface can be increased.
【００５９】本発明の非発光型表示装置によれば、本発
明の平面光源の光出射面側に非発光型表示パネルを配置
させるとしているが、本発明の平面光源は、光出射面か
ら出射される平面光の輝度が高いので、鮮明な明るい画
面を得ることができる。According to the non-emissive display device of the present invention, the non-emissive display panel is arranged on the light emitting surface side of the flat light source of the present invention. However, the flat light source of the present invention emits from the light emitting surface. Since the brightness of the generated plane light is high, a clear bright screen can be obtained.
【図１】本発明の平面光源の第１実施例を示す概略的平
面図である。FIG. 1 is a schematic plan view showing a first embodiment of a flat light source of the present invention.
【図２】図１に示すＡ−Ａ線に沿った概略的断面図であ
る。FIG. 2 is a schematic cross-sectional view taken along the line AA shown in FIG.
【図３】本発明の平面光源の第１実施例が設ける導光板
の裏側に形成されるプリズムアレイの頂線及び谷線の延
在方向を示す概略的平面図である。FIG. 3 is a schematic plan view showing the extending directions of the top line and the valley line of the prism array formed on the back side of the light guide plate provided in the first embodiment of the flat light source of the present invention.
【図４】図３に示すＢ−Ｂ線に沿った導光板の概略的断
面図である。FIG. 4 is a schematic cross-sectional view of the light guide plate taken along the line BB shown in FIG.
【図５】本発明の平面光源の第１実施例が設ける導光板
の裏面側にシルク印刷された白色塗料層の分布状態を示
す概略的平面図である。FIG. 5 is a schematic plan view showing a distribution state of a white paint layer silk-printed on the back surface side of the light guide plate provided in the first embodiment of the flat light source of the present invention.
【図６】第１比較例を示す概略的断面図である。FIG. 6 is a schematic cross-sectional view showing a first comparative example.
【図７】第２比較例を示す概略的断面図である。FIG. 7 is a schematic cross-sectional view showing a second comparative example.
【図８】本発明の平面光源の第２実施例を示す概略的平
面図である。FIG. 8 is a schematic plan view showing a second embodiment of the flat light source of the present invention.
【図９】本発明の非発光型表示装置の第１実施例の要部
を示す概略的断面図である。FIG. 9 is a schematic cross-sectional view showing a main part of a first embodiment of the non-emissive display device of the present invention.
【図１０】本発明の非発光型表示装置の第２実施例の要
部を示す概略的断面図である。FIG. 10 is a schematic sectional view showing an essential part of a second embodiment of the non-emissive display device of the present invention.
【図１１】従来の平面光源の一例を示す概略的断面図で
ある。FIG. 11 is a schematic cross-sectional view showing an example of a conventional flat light source.
１０ 冷陰極管 １１ ホルダー １２ 導光板 ２３ 白色塗料層 ２５ 反射板 ２６ 反射板 ２７ 拡散板 ３０ プリズムアレイフィルム 10 Cold Cathode Fluorescent Tube 11 Holder 12 Light Guide Plate 23 White Paint Layer 25 Reflector 26 Reflector 27 Diffuser 30 Prism Array Film
───────────────────────────────────────────────────── フロントページの続き (72)発明者 目崎 義憲 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 (72)発明者 戸松 正宏 神奈川県横浜市都筑区川和町654番地 富 士通化成株式会社内 (72)発明者 遊座 裕明 神奈川県横浜市都筑区川和町654番地 富 士通化成株式会社内 (72)発明者 塩沢 勲 神奈川県横浜市都筑区川和町654番地 富 士通化成株式会社内 (72)発明者 飯島 岳 神奈川県横浜市都筑区川和町654番地 富 士通化成株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshinori Mezaki Yoshinori Mezaki 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Masahiro Tomatsu Masahiro Tomatsu, 654 Kawawa-cho, Tsuzuki-ku, Yokohama City, Kanagawa Prefecture (72) Inventor Hiroaki Yuza 654 Kawawa-cho, Tsuzuki-ku, Yokohama-shi, Kanagawa Fujitsukasei Co., Ltd. (72) Inventor Isao Shiozawa 654 Kawawa-cho, Tsuzuki-ku, Yokohama-shi, Kanagawa Fujitsukasei Incorporated (72) Inventor Mt. Iijima 654 Kawawa-cho, Tsuzuki-ku, Yokohama-shi, Kanagawa Fujitsukasei Co., Ltd.
Claims (7)
する第１の仮想平面内に存在する頂線と、前記表面と平
行する第２の仮想平面内に存在する谷線とが、平行、か
つ、交互に形成されてなるプリズムアレイを形成し、一
又は複数の端面から入射される光を前記表面から出射す
る導光板と、この導光板の前記一又は複数の端面に光を
入射する線光源とを有してなる平面光源において、前記
導光板の裏面側に、前記線光源からの光が入射される前
記一又は複数の端面から遠ざかるに従い、単位面積あた
りの拡散乱反射面積が大となるように、拡散乱反射部が
設けられていることを特徴とする平面光源。1. A front surface is a plane, and a back surface has a top line existing in a first virtual plane parallel to the front surface and a valley line existing in a second virtual plane parallel to the surface. A light guide plate that forms prism arrays that are formed in parallel and alternately and that emits light that is incident from one or a plurality of end faces from the surface, and makes light incident on the one or a plurality of end faces of the light guide plate. In a flat light source including a linear light source, the diffused irregular reflection area per unit area increases as the distance from the one or more end faces on which the light from the linear light source is incident is increased on the back surface side of the light guide plate. A flat light source, characterized in that a diffuse diffuse reflection section is provided so that
印刷することにより、又は、前記導光板の裏面を粗面加
工することにより形成されていることを特徴とする請求
項１記載の平面光源。2. The diffused and diffused reflection portion is formed by printing on the back surface of the light guide plate or by roughening the back surface of the light guide plate. Flat light source.
播する光を反射して前記表面から出射する役目を有する
第１のプリズム面と、前記導光板内を伝播する光を反射
して前進させる役目を有する第２のプリズム面とからな
り、前記第１のプリズム面の前記第１の仮想平面に対す
る傾斜角は、前記第２のプリズム面の前記第１の仮想平
面に対する傾斜角よりも大とされていることを特徴とす
る請求項１又は２記載の平面光源。3. The first prism surface having a role of reflecting the light propagating in the light guide plate and emitting the light from the surface, and the prism array advancing by reflecting the light propagating in the light guide plate. And a second prism surface having a role of causing the first prism surface to have an inclination angle with respect to the first virtual plane that is greater than an inclination angle of the second prism surface with respect to the first virtual plane. The flat light source according to claim 1 or 2, wherein:
面に対する傾斜角は、３０°以上４８°以下とされてい
ることを特徴とする請求項３記載の平面光源。4. The flat light source according to claim 3, wherein an inclination angle of the first prism surface with respect to the first virtual plane is 30 ° or more and 48 ° or less.
いることを特徴とする請求項１、２、３又は４記載の平
面光源。5. The flat light source according to claim 1, wherein a diffusion plate is arranged on the front surface side of the light guide plate.
散板上に光出射面の法線方向の輝度を高めるための光制
御板を配置させていることを特徴とする請求項５記載の
平面光源。6. A light control plate for enhancing brightness in a direction normal to a light emitting surface is arranged between the light guide plate and the diffusion plate or on the diffusion plate. The plane light source described.
面光源の光出射面側に非発光型表示パネルを配置させて
なることを特徴とする非発光型表示装置。7. A non-emissive display device, characterized in that a non-emissive display panel is arranged on the light emission surface side of the flat light source according to any one of claims 1, 2, 3, 4, 5 or 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7026937A JPH08220344A (en) | 1995-02-15 | 1995-02-15 | Planar light source and non-light-emitting display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7026937A JPH08220344A (en) | 1995-02-15 | 1995-02-15 | Planar light source and non-light-emitting display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08220344A true JPH08220344A (en) | 1996-08-30 |
Family
ID=12207072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7026937A Pending JPH08220344A (en) | 1995-02-15 | 1995-02-15 | Planar light source and non-light-emitting display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08220344A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6862141B2 (en) | 2002-05-20 | 2005-03-01 | General Electric Company | Optical substrate and method of making |
| US7180672B2 (en) | 2002-05-20 | 2007-02-20 | General Electric Company | Optical substrate and method of making |
| US7248412B2 (en) | 2003-12-31 | 2007-07-24 | General Electric Company | Optical substrate with modulated structure |
| KR100769079B1 (en) * | 2000-08-02 | 2007-10-22 | 가부시키가이샤 엔프라스 | Light guiding plate, surface light source device, and display device |
| EP1933178A1 (en) * | 2006-12-12 | 2008-06-18 | Samsung Electronics Co., Ltd. | Optical sheet and method for fabricating the same |
| US7859759B2 (en) | 2002-05-20 | 2010-12-28 | Sabic Innovative Plastics Ip B.V. | Film, backlight displays, and methods for making the same |
| WO2019184446A1 (en) * | 2018-03-30 | 2019-10-03 | 京东方科技集团股份有限公司 | Optical waveguide element and control method therefor, backlight module and display device |
-
1995
- 1995-02-15 JP JP7026937A patent/JPH08220344A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100769079B1 (en) * | 2000-08-02 | 2007-10-22 | 가부시키가이샤 엔프라스 | Light guiding plate, surface light source device, and display device |
| US6862141B2 (en) | 2002-05-20 | 2005-03-01 | General Electric Company | Optical substrate and method of making |
| US7180672B2 (en) | 2002-05-20 | 2007-02-20 | General Electric Company | Optical substrate and method of making |
| US7324284B2 (en) | 2002-05-20 | 2008-01-29 | General Electric Company | Optical substrate and method of making |
| US7859759B2 (en) | 2002-05-20 | 2010-12-28 | Sabic Innovative Plastics Ip B.V. | Film, backlight displays, and methods for making the same |
| US7965447B2 (en) | 2002-05-20 | 2011-06-21 | Sabic Innovative Plastics Ip B.V. | Optical substrate and method of making |
| US7248412B2 (en) | 2003-12-31 | 2007-07-24 | General Electric Company | Optical substrate with modulated structure |
| US7483195B2 (en) | 2003-12-31 | 2009-01-27 | Sabic Innovative Plastics Ip B.V. | Optical substrate with modulated structure |
| EP1933178A1 (en) * | 2006-12-12 | 2008-06-18 | Samsung Electronics Co., Ltd. | Optical sheet and method for fabricating the same |
| US8158040B2 (en) | 2006-12-12 | 2012-04-17 | Samsung Electronics Co., Ltd. | Method for fabricating an optical sheet |
| WO2019184446A1 (en) * | 2018-03-30 | 2019-10-03 | 京东方科技集团股份有限公司 | Optical waveguide element and control method therefor, backlight module and display device |
| US11391882B2 (en) | 2018-03-30 | 2022-07-19 | Beijing Boe Optoelectronics Technology Co., Ltd. | Optical waveguide element and control method thereof, backlight module and display device |
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| A02 | Decision of refusal |
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