JPH09292529A - Illuminator and liquid crystal display device - Google Patents
Illuminator and liquid crystal display deviceInfo
- Publication number
- JPH09292529A JPH09292529A JP8105514A JP10551496A JPH09292529A JP H09292529 A JPH09292529 A JP H09292529A JP 8105514 A JP8105514 A JP 8105514A JP 10551496 A JP10551496 A JP 10551496A JP H09292529 A JPH09292529 A JP H09292529A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- effective
- crystal display
- display device
- 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)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は面状に光照射する照明装
置に関するものであり、さらにこの照明装置を搭載した
液晶表示装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device that irradiates light on a surface, and more particularly to a liquid crystal display device equipped with this lighting device.
【０００２】[0002]
【従来の技術】各種表示装置には面状に光照射する照明
装置が搭載されるタイプのものがあり、たとえば時分割
方式やアクティブマトリクス方式の液晶表示装置の分野
においては、その視認性の向上をはかるためにバックラ
イト方式が採用されている。そして、特にカラー液晶表
示装置では、モノクロの液晶表示装置と比べてパネル透
過率がきわめて低いため、さらに高輝度の薄型照明装置
が要求される。2. Description of the Related Art There are various types of display devices in which a lighting device for irradiating light on a surface is mounted. For example, in the field of time division type or active matrix type liquid crystal display devices, their visibility is improved. A backlight system is used to measure the brightness. Further, particularly in a color liquid crystal display device, the panel transmittance is extremely low as compared with a monochrome liquid crystal display device, so that a thin illumination device with higher brightness is required.
【０００３】図３はバックライト方式の液晶表示装置１
の断面概略図であり、図４はその要部断面概略図であ
る。液晶表示装置１は液晶パネル２と照明装置３とから
構成され、照明装置３は矩形状の導光板４の端面に長尺
円筒状の蛍光ランプ５を配置する２灯タイプのエッジラ
イト方式である。導光板４の一方主面に拡散板６を設
け、その他方主面には板状の光反射部材７を設けてい
る。また、蛍光ランプ５を覆うようにＡｌ等から成るリ
フレクター８を設けている。そして、導光板４の他方主
面上には白色ないし乳白色系を呈してガラスビーズを含
有するドット状の印刷パターンを設けて、光散乱層９を
構成している。この光散乱層９によれば、ほぼ全面に多
数個でもって高密度にドット分布し、これによって輝度
を高める調整手段となしている。FIG. 3 shows a backlight type liquid crystal display device 1.
FIG. 4 is a schematic cross-sectional view of FIG. 4, and FIG. The liquid crystal display device 1 includes a liquid crystal panel 2 and a lighting device 3. The lighting device 3 is a two-light type edge light system in which a long cylindrical fluorescent lamp 5 is arranged on an end surface of a rectangular light guide plate 4. . A diffusion plate 6 is provided on one main surface of the light guide plate 4, and a plate-shaped light reflecting member 7 is provided on the other main surface. Further, a reflector 8 made of Al or the like is provided so as to cover the fluorescent lamp 5. Then, a dot-shaped print pattern containing a white or milky white system and containing glass beads is provided on the other main surface of the light guide plate 4 to form the light scattering layer 9. According to the light scattering layer 9, a large number of dots are distributed over the entire surface with a high density, and the light scattering layer 9 serves as an adjusting means for increasing the brightness.
【０００４】この液晶表示装置１によれば、液晶パネル
２が実際に画像表示する領域である有効表示領域１０が
設定され、この有効表示領域１０と対応する位置に、そ
れと同じサイズの有効発光領域１１が設けられている。According to the liquid crystal display device 1, an effective display area 10 which is an area where the liquid crystal panel 2 actually displays an image is set, and an effective light emitting area having the same size as that of the effective display area 10 is set. 11 is provided.
【０００５】そして、２個の蛍光ランプ５の照射光が導
光板４に入射すると、光散乱層９と光反射部材７との組
合せにより、有効発光領域１１の全面にわたって輝度を
高めるとともに、均一な光量で出射するようにしてい
る。When the light emitted from the two fluorescent lamps 5 is incident on the light guide plate 4, the combination of the light scattering layer 9 and the light reflecting member 7 enhances the brightness over the entire surface of the effective light emitting region 11 and makes it uniform. The light is emitted with the amount of light.
【０００６】[0006]
【発明が解決しようとする問題点】しかしながら、上記
構成の液晶表示装置１においては、その薄型軽量化とと
もに、有効表示領域１０以外の構成部分をさらに小さく
することが要求され、導光板４の端面と拡散板６の端面
との間隔Ｄ１（たとえば４ｍｍ）を小さくしているが、
その反面、有効表示領域１０に輝線が発生するという問
題点があった。この輝線は有効表示領域１０内に視認さ
れる光線であり、有効発光領域１１から蛍光ランプ５ま
での距離を短くしたために生じている。However, in the liquid crystal display device 1 having the above-described structure, it is required to reduce the thickness and weight of the liquid crystal display device 1 and to further reduce the size of the components other than the effective display region 10, and the end face of the light guide plate 4 is required. Although the distance D1 (for example, 4 mm) between the end face of the diffuser plate 6 and
On the other hand, there is a problem that bright lines are generated in the effective display area 10. This bright line is a light ray visually recognized in the effective display area 10, and is generated because the distance from the effective light emitting area 11 to the fluorescent lamp 5 is shortened.
【０００７】この問題点を解決するために、導光板４の
他方主面上の光散乱層９が形成されていない端部領域
に、もしくは光反射部材７上の光散乱層９と対向しない
端部領域にカーボン等を含有した黒色インクでもってド
ット状にパターンしてなる光吸収層を設け、この光吸収
層により余分な輝線を吸収する構成が提案されている
（特開平８−４３６３６号参照）。In order to solve this problem, in the end region where the light scattering layer 9 is not formed on the other main surface of the light guide plate 4 or at the end which does not face the light scattering layer 9 on the light reflecting member 7. It has been proposed to provide a light absorbing layer which is patterned in a dot shape with a black ink containing carbon or the like in a partial area and absorbs an extra bright line by the light absorbing layer (see Japanese Patent Laid-Open No. 8-43636). ).
【０００８】しかしながら、この提案の液晶表示装置に
よっても未だ満足し得る程度にまで輝線問題が解決され
ていないことが判明した。すなわち、蛍光ランプ５の発
熱に起因して、装置の面内に温度ムラが発生するが、こ
の温度ムラは、とくに蛍光ランプ５にもっとも近い輝度
発生領域で顕著であり、これによって輝度にもムラが生
じ（かかる温度ムラによって液晶のしきい値電圧が部分
的に変動することで、その液晶の透過率が変わるためで
ある）、これによって単に光吸収層を設けただけでは輝
度の問題が満足できる程度に解決できないことが判明し
た。However, it has been found that the proposed liquid crystal display device still does not solve the bright line problem to a satisfactory degree. That is, due to the heat generation of the fluorescent lamp 5, temperature unevenness is generated in the plane of the device, and this temperature unevenness is particularly remarkable in the brightness generation region closest to the fluorescent lamp 5, and this causes uneven brightness. Occurs (because the threshold voltage of the liquid crystal partially changes due to such temperature unevenness, the transmittance of the liquid crystal changes), and thus the brightness problem is satisfied simply by providing the light absorption layer. It turned out that it could not be resolved to the extent possible.
【０００９】しかも、蛍光ランプ５の点灯直後において
表示全面にわたり均一な輝度が得られても、点灯時間が
長くなると、蛍光ランプ５の発熱によって液晶表示面に
まで熱伝導し、これにより、ネガティブタイプの液晶表
示装置では高温領域で透過率が大きくなって、その高温
領域で輝度が高くなるという問題点があった。Moreover, even if a uniform brightness is obtained over the entire display surface immediately after the fluorescent lamp 5 is turned on, if the lighting time becomes long, heat is conducted to the liquid crystal display surface due to the heat generated by the fluorescent lamp 5, whereby the negative type The above liquid crystal display device has a problem that the transmittance is high in a high temperature region and the brightness is high in the high temperature region.
【００１０】したがって本発明は上記事情に鑑みて完成
されたものであり、その目的は輝線の発生をさらに効果
的に防いで、有効発光領域の全面にわたって均一な光量
で出射させる高品位かつ小型の照明装置を提供すること
にある。Therefore, the present invention has been completed in view of the above circumstances, and an object thereof is to prevent generation of bright lines more effectively and to emit a uniform amount of light over the entire surface of an effective light emitting region. It is to provide a lighting device.
【００１１】本発明の他の目的は長尺状光源の発熱がお
よぼす影響を小さくして、長期間にわたって輝線の発生
を防いだ長期信頼性の照明装置を提供することにある。Another object of the present invention is to provide a long-term reliable lighting device in which the influence of heat generation of a long light source is reduced to prevent the generation of bright lines for a long period of time.
【００１２】また、本発明のさらに他の目的は、かかる
本発明の照明装置を搭載した高性能かつ高信頼性、なら
びに小型の液晶表示装置を提供することにある。Still another object of the present invention is to provide a high-performance, high-reliability and small-sized liquid crystal display device equipped with the lighting device of the present invention.
【００１３】[0013]
【問題点を解決するための手段】本発明の照明装置は、
一方主面の有効発光領域より光出射する導光板の他方主
面に光散乱させるべくドット状にパターンして成る光散
乱層を形成し、この光散乱層上に光反射部材を配設し、
上記導光板の端面に長尺状光源を設けてなり、さらに有
効発光領域の長尺状光源にもっとも近接する辺にまたが
って、その辺の両側の部位にドット状にパターンしてな
る帯状の光吸収層を導光板の他方主面上もしくは光反射
部材上に設けるとともに、有効発光領域の端部付近の輝
度を均一にさせるべく光吸収層のドット状パターンの分
布密度を調整したことを特徴とする。The lighting device of the present invention comprises:
On the other main surface of the light guide plate that emits light from the effective light emitting area of the one main surface, a light scattering layer formed in a dot pattern is formed to scatter light, and a light reflecting member is disposed on this light scattering layer.
A strip-shaped light is formed by providing a long light source on the end surface of the light guide plate, straddling a side of the effective light emitting region closest to the long light source, and having a dot pattern on both sides of the side. The absorption layer is provided on the other main surface of the light guide plate or on the light reflection member, and the distribution density of the dot-shaped pattern of the light absorption layer is adjusted to make the brightness near the end of the effective light emitting region uniform. To do.
【００１４】本発明の液晶表示装置は、本発明の照明装
置の一方主面上に、有効発光領域に対応する有効表示領
域を有する液晶パネルを配したことを特徴とする。The liquid crystal display device of the present invention is characterized in that a liquid crystal panel having an effective display region corresponding to the effective light emitting region is arranged on one main surface of the illuminating device of the present invention.
【００１５】[0015]
【発明の実施の形態】図１は本発明の液晶表示装置１２
の要部断面概略図であり、図２は液晶表示装置１２に設
けられた光吸収層１３のドット状パターンの密度の大小
関係を示す要部拡大断面概略図である。なお、同図の液
晶表示装置１２において、図３と図４に示す液晶表示装
置１と同一部材には同一符号を付す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a liquid crystal display device 12 according to the present invention.
2 is a schematic cross-sectional view of an essential part showing a size relationship of the density of the dot pattern of the light absorption layer 13 provided in the liquid crystal display device 12. FIG. In the liquid crystal display device 12 of the same figure, the same members as those of the liquid crystal display device 1 shown in FIGS. 3 and 4 are designated by the same reference numerals.
【００１６】この液晶表示装置１２によれば、一対の金
属ケース（例示せず）に液晶パネル２と照明装置３ａと
を組み入れたものであって、この照明装置３ａによれ
ば、厚さ３ｍｍのポリメチルメタアクリレート製導光板
４の端面に沿って２個の長尺状光源としての管径２．６
ｍｍの冷陰極型の蛍光ランプ５を配設し、その蛍光ラン
プ５の外周に銀を蒸着したアルミニウムもしくはＰＥＴ
製光源用反射板８を設けている。この光源用反射板８は
蛍光ランプ５の長手方向に沿って横断面形状が湾曲した
反射面を有している。According to the liquid crystal display device 12, the liquid crystal panel 2 and the lighting device 3a are incorporated in a pair of metal cases (not shown), and the lighting device 3a has a thickness of 3 mm. Along the end surface of the light guide plate 4 made of polymethylmethacrylate, two tube diameters 2.6 as long light sources.
mm cold cathode type fluorescent lamp 5 is arranged, and aluminum or PET on which silver is vapor-deposited on the outer periphery of the fluorescent lamp 5.
A light source-made reflection plate 8 is provided. The light source reflection plate 8 has a reflection surface whose cross-sectional shape is curved along the longitudinal direction of the fluorescent lamp 5.
【００１７】上記導光板４の一方主面上にＰＥＴもしく
はポリカーボネイト（ＰＣ）製の光拡散板６を設け、他
方主面上にはドット状光散乱層９を形成している。この
ドット状光散乱層９は、輝度を面状に高める調整手段と
して、白色乃至乳白色系を呈するガラスビーズ（酸化チ
タン添加）が含有されたものを印刷パターンして、多数
高密度に分布するように形成したものである。このドッ
ト状光散乱層上に白色のポリエチレンテレフタレート製
光反射板７を設けている。A light diffusing plate 6 made of PET or polycarbonate (PC) is provided on one main surface of the light guide plate 4, and a dot-like light scattering layer 9 is formed on the other main surface. The dot-shaped light-scattering layer 9 is printed with a pattern containing glass beads (titanium oxide added) exhibiting a white to milky white system as a means for adjusting the brightness in a planar manner so that a large number of them are distributed at high density. It was formed in. A white polyethylene terephthalate light reflection plate 7 is provided on the dot-shaped light scattering layer.
【００１８】上記液晶パネル２はパターニングされた２
枚のガラス基板をシール剤でもって貼り合わせ、その後
に所定の寸法でもって切り出し、液晶を封入した構成で
あって、この液晶パネル２のうち画像表示する領域を有
効表示領域１０となし、この有効表示領域１０と対応す
る同一位置に、それと同じサイズの有効発光領域１１が
ある。The liquid crystal panel 2 is patterned 2
A structure in which a sheet of glass substrates is attached with a sealant, and then cut out with a predetermined size and liquid crystal is enclosed, and an area for displaying an image in the liquid crystal panel 2 is referred to as an effective display area 10. At the same position corresponding to the display area 10, there is an effective light emitting area 11 of the same size.
【００１９】そして、上記構成の液晶表示装置１２を小
型化するに当たって、導光板４の端面と有効発光領域１
１との間隔を小さくすると、その端面にそって輝線発生
領域１４（幅Ｄ２）が生じる。また、この輝線発生領域
１４においては、点灯の当初において一様な輝線が発生
するが、時間経過とともに蛍光ランプ５の発熱によって
輝度ムラが生じる輝度ムラ領域１５（幅Ｄ３）ができ
る。In order to reduce the size of the liquid crystal display device 12 having the above structure, the end face of the light guide plate 4 and the effective light emitting region 1 are used.
When the distance from 1 is decreased, the bright line generation region 14 (width D2) is formed along the end face. Further, in the bright line generation region 14, a uniform bright line is generated at the beginning of lighting, but there is a brightness uneven region 15 (width D3) in which brightness unevenness occurs due to heat generation of the fluorescent lamp 5 over time.
【００２０】そこで、本発明においては、この輝線発生
領域１４および輝度ムラ領域１５にわたって光吸収層１
３を形成して余分な輝線を吸収するようにしている。こ
の光吸収層１３はカーボン等を含有した黒色インクでも
ってドット状にパターンしてなり、しかも、有効発光領
域１１の辺にまたがって、その辺の両側の部位に帯状を
なしている。Therefore, in the present invention, the light absorption layer 1 extends over the bright line generation region 14 and the brightness unevenness region 15.
3 is formed to absorb an extra bright line. The light absorption layer 13 is patterned in a dot shape with a black ink containing carbon or the like, and extends over the side of the effective light emitting region 11 and has a band shape on both sides of the side.
【００２１】さらに輝線発生領域１４と輝度ムラ領域１
５とが重ねられた領域１６は、その両側の他の領域１
７、１８と比べて輝線がより多く発生することがわか
り、そのために、領域１６の光吸収率を領域１７、１８
よりも高め、これによって輝度ムラが生じないようにし
ている。このように高い光吸収率を得るためには、ドッ
ト状のパターンの密度を高めたり、あるいはそのドット
面積を広くすればよい。Further, the bright line generation area 14 and the uneven brightness area 1
The region 16 in which 5 and 5 are overlapped is the other region 1 on both sides thereof.
It can be seen that more bright lines are generated as compared with Nos. 7 and 18, and therefore the light absorption rate of the region 16 is changed to those of the regions 17 and 18.
It is set higher than the above, so that uneven brightness does not occur. In order to obtain such a high light absorptance, the density of the dot pattern may be increased or the dot area may be increased.
【００２２】かくして上記構成の液晶表示装置１２によ
れば、ドット状パターンの光吸収層１３を形成するに当
たって、ドット状パターンの密度を調整したことで有効
発光領域１１の端部付近の輝度を均一にできた。Thus, according to the liquid crystal display device 12 having the above-described structure, when the light absorption layer 13 having the dot pattern is formed, the density of the dot pattern is adjusted so that the luminance near the end of the effective light emitting region 11 is uniform. I was able to.
【００２３】つぎに本発明の他の実施形態を図５により
説明する。同図は本発明の液晶表示装置１９の要部断面
概略図であり、図１の液晶表示装置１２と同一部材には
同一符号を付す。Next, another embodiment of the present invention will be described with reference to FIG. This figure is a schematic cross-sectional view of a main part of a liquid crystal display device 19 of the present invention, and the same members as those of the liquid crystal display device 12 of FIG.
【００２４】液晶表示装置１２の照明装置３ａでは、光
吸収層１３を導光板４に設けているのに対して、液晶表
示装置１９の照明装置３ｂにおいては、光反射板７の上
に同様な光吸収層１３ａを形成している。In the illuminating device 3a of the liquid crystal display device 12, the light absorbing layer 13 is provided on the light guide plate 4, whereas in the illuminating device 3b of the liquid crystal display device 19, a similar light reflecting plate 7 is provided. The light absorption layer 13a is formed.
【００２５】この構成の照明装置３ｂまたは液晶表示装
置１９であっても、輝線発生領域と輝度ムラ領域とが重
ねられた領域において、その両側の他の領域と比べて光
吸収率を高めているので、これによって輝度ムラが生じ
なくなり、有効発光領域１１の端部付近の輝度を均一に
できた。Even in the illuminating device 3b or the liquid crystal display device 19 having this structure, in the region where the bright line generating region and the uneven brightness region are overlapped, the light absorption rate is higher than that of the other regions on both sides thereof. As a result, uneven brightness does not occur, and the brightness near the end of the effective light emitting region 11 can be made uniform.
【００２６】[0026]
【実施例】つぎに本発明者は上記構成の照明装置３ａを
用いて、下記のように輝度を測定した。図６の照明装置
３ａの平面図が示すように、その面に番号付与された９
個の部位を指定し、個々の部位の輝度を測定し、さらに
これらの平均値を求めたところ、図７に示す通りの結果
が得られた。また、従来の図３の照明装置３についても
同様に輝度を測定したところ、図８に示す通りの結果が
得られた。各輝度の数値の単位はｃｄ／ｍ2 である。EXAMPLES Next, the present inventor measured the brightness as follows using the illumination device 3a having the above-mentioned configuration. As shown in the plan view of the illumination device 3a in FIG. 6, the surface is numbered 9
When individual parts were designated, the brightness of each part was measured, and the average value of these was calculated, the results shown in FIG. 7 were obtained. Further, when the luminance was similarly measured for the conventional lighting device 3 of FIG. 3, the result as shown in FIG. 8 was obtained. The unit of the numerical value of each luminance is cd / m 2 .
【００２７】これらの図から明らかなとおり、本発明
（図７）においては、９点平均輝度が６７．７ｃｄ／ｍ
2 であるが、これと対比して、その差が小さくなってい
る。しかるに、比較例（図８）では、その９点平均輝度
よりもエッジ部において輝度が著しく高くなって、輝度
ムラとして認められる。As is apparent from these figures, in the present invention (FIG. 7), the 9-point average luminance is 67.7 cd / m.
It is 2 , but the difference is small compared to this. However, in the comparative example (FIG. 8), the brightness is significantly higher at the edge portion than the 9-point average brightness, and it is recognized as uneven brightness.
【００２８】なお、本発明は上記実施形態に限定される
ものではなく、本発明の要旨を逸脱しない範囲内で種々
の変更、改良等は何ら差し支えない。たとえば上記実施
形態においては導光板４が平板であるが、それに代わっ
てクサビ状の導光板を用いた１灯式のバックライトの照
明装置にしてもよい。The present invention is not limited to the above embodiment, and various modifications and improvements can be made without departing from the scope of the present invention. For example, although the light guide plate 4 is a flat plate in the above-described embodiment, a single-light type backlight illuminating device using a wedge-shaped light guide plate may be used instead.
【００２９】[0029]
【発明の効果】以上のように、本発明の照明装置によれ
ば、有効発光領域の長尺状光源にもっとも近接する辺に
またがって、その辺の両側の部位にドット状にパターン
してなる帯状の光吸収層を導光板の他方主面上もしくは
光反射部材上に設けるとともに、有効発光領域の端部付
近の輝度を均一にさせるべく光吸収層のドット状パター
ンの密度を調整したことにより、輝線の発生や輝度ムラ
を防いで、これによって有効発光領域の全面にわたって
輝度を高めて、均一な光量で出射させる高品位かつ小型
の照明装置が提供できた。As described above, according to the illuminating device of the present invention, the effective light emitting region is formed in a dot pattern on both sides of the side that is closest to the elongated light source. By providing a band-shaped light absorbing layer on the other main surface of the light guide plate or on the light reflecting member, and adjusting the density of the dot-shaped pattern of the light absorbing layer to make the brightness near the edge of the effective light emitting region uniform. Thus, it is possible to provide a high-quality and small-sized illuminating device capable of preventing the generation of bright lines and uneven brightness, thereby increasing the brightness over the entire surface of the effective light emitting region and emitting a uniform amount of light.
【００３０】また、本発明の照明装置によれば、輝線が
発生しないような部位に調整しながら最適な条件でもっ
て配することで、長尺状光源の発熱がおよぼす影響を小
さくして、長期間にわたって輝線の発生を防いた長期信
頼性の照明装置が提供できた。Further, according to the illumination device of the present invention, by arranging it under the optimum conditions while adjusting it to a portion where bright lines do not occur, the influence of the heat generation of the elongated light source is reduced, and It was possible to provide a lighting device with long-term reliability that prevented the generation of bright lines over a period of time.
【００３１】さらにまた、本発明の液晶表示装置によれ
ば、本発明の照明装置の一方主面上に、有効発光領域に
対応する有効表示領域を有する液晶パネルを配したこと
によって、高信頼性かつ小型の液晶表示装置が提供でき
た。Further, according to the liquid crystal display device of the present invention, by disposing the liquid crystal panel having the effective display area corresponding to the effective light emitting area on one main surface of the illuminating device of the present invention, high reliability is achieved. Moreover, a small liquid crystal display device could be provided.
【図面の簡単な説明】[Brief description of drawings]
【図１】実施形態の液晶表示装置の要部断面概略図であ
る。FIG. 1 is a schematic cross-sectional view of a main part of a liquid crystal display device according to an embodiment.
【図２】実施形態の液晶表示装置の要部拡大断面概略図
である。FIG. 2 is a schematic enlarged cross-sectional view of a main part of the liquid crystal display device of the embodiment.
【図３】従来の液晶表示装置の断面概略図である。FIG. 3 is a schematic cross-sectional view of a conventional liquid crystal display device.
【図４】従来の液晶表示装置の要部断面概略図である。FIG. 4 is a schematic cross-sectional view of a main part of a conventional liquid crystal display device.
【図５】他の実施形態の液晶表示装置の要部断面概略図
である。FIG. 5 is a schematic cross-sectional view of a main part of a liquid crystal display device according to another embodiment.
【図６】照明装置の輝度測定部位を示す説明図である。FIG. 6 is an explanatory diagram showing a luminance measurement portion of the illumination device.
【図７】実施形態の照明装置の輝度の経時変化を示す線
図である。FIG. 7 is a diagram showing a change with time in luminance of the illumination device of the embodiment.
【図８】従来の照明装置の輝度の経時変化を示す線図で
ある。FIG. 8 is a diagram showing a temporal change in luminance of a conventional lighting device.
２ 液晶パネル ３ａ、３ｂ 照明装置 ４ 導光板 ５ 蛍光ランプ ６ 光拡散板 ７ 光反射板 ８ 反射板 ９ 光散乱層 １０ 有効表示領域 １１ 有効発光領域 １２、１９ 液晶表示装置 １３、１３ａ 光吸収層 １４ 輝線発生領域 １５ 輝度ムラ領域 2 Liquid crystal panel 3a, 3b Illumination device 4 Light guide plate 5 Fluorescent lamp 6 Light diffusing plate 7 Light reflecting plate 8 Reflecting plate 9 Light scattering layer 10 Effective display area 11 Effective light emitting area 12, 19 Liquid crystal display device 13, 13a Light absorbing layer 14 Bright line generation area 15 Brightness unevenness area
Claims (2)
導光板の他方主面に光散乱させるべくドット状にパター
ンして成る光散乱層を形成し、この光散乱層上に光反射
部材を配設し、上記導光板の端面に長尺状光源を設けて
成る照明装置において、有効発光領域の長尺状光源にも
っとも近接する辺にまたがって、その辺の両側の部位に
ドット状にパターンしてなる帯状の光吸収層を導光板の
他方主面上もしくは光反射部材上に設けるとともに、有
効発光領域の端部付近の輝度を均一にさせるべく光吸収
層のドット状パターンの分布密度を調整したことを特徴
とする照明装置。1. A light-scattering layer formed in a dot pattern to scatter light is formed on the other main surface of a light guide plate that emits light from an effective light emitting region of one main surface, and a light-reflecting member is formed on the light-scattering layer. In a lighting device comprising a light source and a long light source provided on the end surface of the light guide plate, a dot shape is formed on both sides of the side across the side closest to the long light source in the effective light emitting region. A patterned band-shaped light-absorbing layer is provided on the other main surface of the light guide plate or on the light-reflecting member, and the distribution density of the dot-shaped pattern of the light-absorbing layer is made uniform in order to make the brightness near the edge of the effective light emitting region uniform. A lighting device characterized by being adjusted.
効発光領域に対応する有効表示領域を有する液晶パネル
を配した液晶表示装置。2. A liquid crystal display device in which a liquid crystal panel having an effective display region corresponding to an effective light emitting region is arranged on one main surface of the illuminating device of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8105514A JPH09292529A (en) | 1996-04-25 | 1996-04-25 | Illuminator and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8105514A JPH09292529A (en) | 1996-04-25 | 1996-04-25 | Illuminator and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09292529A true JPH09292529A (en) | 1997-11-11 |
Family
ID=14409719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8105514A Pending JPH09292529A (en) | 1996-04-25 | 1996-04-25 | Illuminator and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09292529A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100420193B1 (en) * | 1999-09-09 | 2004-03-03 | 가부시키가이샤 엔프라스 | Surface light source device and image display device with the same device |
| JP2010040413A (en) * | 2008-08-07 | 2010-02-18 | Panasonic Corp | Light guide sheet, and movable contact using the same |
| JP2012083558A (en) * | 2010-10-12 | 2012-04-26 | Sharp Corp | Display |
-
1996
- 1996-04-25 JP JP8105514A patent/JPH09292529A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100420193B1 (en) * | 1999-09-09 | 2004-03-03 | 가부시키가이샤 엔프라스 | Surface light source device and image display device with the same device |
| JP2010040413A (en) * | 2008-08-07 | 2010-02-18 | Panasonic Corp | Light guide sheet, and movable contact using the same |
| JP2012083558A (en) * | 2010-10-12 | 2012-04-26 | Sharp Corp | Display |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3379043B2 (en) | Planar lighting device | |
| US5335100A (en) | Apparatus for lighting a liquid crystal element | |
| KR940003349Y1 (en) | Device for lighting liquid crystal display devices | |
| US6611304B2 (en) | Planar light source device and liquid crystal display using the same | |
| JP2000222925A (en) | Surface lighting system | |
| JPH04191704A (en) | Surface luminous device and its manufacture | |
| JP2003281920A (en) | Lighting device | |
| JP3472510B2 (en) | Surface emitting device | |
| JPH09292529A (en) | Illuminator and liquid crystal display device | |
| US8330896B2 (en) | Liquid crystal display device | |
| JP3298979B2 (en) | Substrate for surface light source device | |
| JP2780046B2 (en) | Backlight device | |
| JPH06110057A (en) | Liquid crystal display device | |
| JP3266487B2 (en) | Liquid crystal display | |
| JPH117012A (en) | Liquid crystal device and electronic equipment using the same | |
| JP2004055232A (en) | Surface light source device | |
| JP3285716B2 (en) | Liquid crystal display | |
| JPH08122778A (en) | Liquid crystal display device | |
| JP2000137223A (en) | Liquid crystal display device | |
| JP3300488B2 (en) | L-shaped line light source type surface emitting device | |
| JP3222186B2 (en) | Surface emitting device | |
| JPH11295737A (en) | Liquid crystal display device | |
| JPH0843636A (en) | Illumination device and liquid crystal display device | |
| JPH1010533A (en) | Liquid crystal display device | |
| JPH1184380A (en) | Liquid crystal display device and liquid crystal panel illuminating device therefor |