JPH0348281A - Illuminating device for display body - Google Patents
Illuminating device for display bodyInfo
- Publication number
- JPH0348281A JPH0348281A JP2010226A JP1022690A JPH0348281A JP H0348281 A JPH0348281 A JP H0348281A JP 2010226 A JP2010226 A JP 2010226A JP 1022690 A JP1022690 A JP 1022690A JP H0348281 A JPH0348281 A JP H0348281A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- display
- light scattering
- central part
- 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.)
- Granted
Links
- 238000000149 argon plasma sintering Methods 0.000 claims abstract description 46
- 238000005286 illumination Methods 0.000 claims abstract description 26
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000004973 liquid crystal related substance Substances 0.000 description 23
- 230000000694 effects Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920005668 polycarbonate resin Polymers 0.000 description 2
- 239000004431 polycarbonate resin Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 201000001880 Sexual dysfunction Diseases 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は液晶表示パネル等の表示体用照明装置、特に表
示体を背面側から照明する所謂バックライトと称する照
明装置に関する．
〔従来の技術〕
近年、例えば液晶表示装置における表示体用照明装置に
おいては、液晶の諸特性が改善されるにつれ、液晶の応
用分野が拡大し、オモチャ用表示、クロック用表示、事
務機器用表示、端末用表示、ターξナル用表示や自動車
用表示等に応用されるのに伴って、長時間の照明、比較
的大型パネルの照明、装飾性のある照明や、効率の良い
照明が要求されるようになった．
従来、例えば腕時計において、液晶表示バネル等の表示
体の背面に小型ランプよりなるバンクライトを備えたも
のが実用化されている．しかし、腕時計においては、夜
間ごく短時間照明して表示を識別し、時刻を知るために
のみ最小限必要なバックライトであって、明るさ、光の
均一性、装飾性、寿命等においては充分満足のいくもの
ではなかった。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lighting device for a display body such as a liquid crystal display panel, and particularly to a lighting device called a backlight that illuminates a display body from the back side. [Prior Art] In recent years, as the various properties of liquid crystals have been improved, the application fields of liquid crystals have expanded, such as displays for toys, clocks, and displays for office equipment, for example in lighting devices for display bodies in liquid crystal display devices. As it is applied to terminal displays, terminal displays, automobile displays, etc., long-term lighting, relatively large panel lighting, decorative lighting, and highly efficient lighting are required. It became so. BACKGROUND ART Conventionally, for example, wristwatches have been put into practical use that are equipped with a bank light consisting of a small lamp on the back of a display body such as a liquid crystal display panel. However, for wristwatches, the backlight is only necessary for a short period of time at night to identify the display and tell the time, and it is sufficient in terms of brightness, uniformity of light, decorativeness, lifespan, etc. It wasn't satisfying.
例えば第９図および第１０図は表示体としての液晶表示
パネル１の背面側、図では真下に光源２と反射体９とを
配した従来の液晶表示装置における表示体用照明装置の
一例を示す縦断正面図および縦断側面図である。For example, FIGS. 9 and 10 show an example of a lighting device for a display body in a conventional liquid crystal display device in which a light source 2 and a reflector 9 are arranged on the back side of a liquid crystal display panel 1 as a display body (in the figure, directly below). They are a longitudinal front view and a longitudinal side view.
液晶表示パ不ル１は、液晶３を上電極基板４と下電極基
板５の間に、スペーサ６を介して挾み、上偏光体７と下
偏光体８を付加することにより構成されている．光ａ２
から放出された光は光散乱反射体９により反射し、乳白
色の光散乱体１０を介して液晶表示パネル１を照射する
．光源２は、ヒューズ型、円筒型、ラインフィラメント
型等の線形形状をしたタングステンランプであった．以
下、略して線状光源と呼ぶ．上記光散乱体１０は、乳白
色のポリカーボネイト樹脂や、乳白色のアクリル樹脂に
より構成され、均一な厚さ、板形状であった．また前記
反射体９は、Ａｌ等の金属板であった。The liquid crystal display panel 1 is constructed by sandwiching a liquid crystal 3 between an upper electrode substrate 4 and a lower electrode substrate 5 via a spacer 6, and adding an upper polarizer 7 and a lower polarizer 8. ．． light a2
The light emitted from the light is reflected by the light scattering reflector 9 and illuminates the liquid crystal display panel 1 via the milky white light scatterer 10. Light source 2 was a tungsten lamp with a linear shape such as a fuse type, cylindrical type, or line filament type. Hereinafter, this will be abbreviated as a linear light source. The light scattering body 10 was made of a milky white polycarbonate resin or a milky white acrylic resin, had a uniform thickness, and had a plate shape. Further, the reflector 9 was a metal plate made of Al or the like.
〔発明が解決しようとする課題］
上記のような従来の表示体用照明装置においては、表示
体としての液晶表示バネル１の真下に線状光源２が配さ
れるため光源２が点光源の場合に比較して、比較的大面
積を比較的強い光で照明でき、使用光ａ２の敗も少なく
て済む利点がある。[Problems to be Solved by the Invention] In the conventional display illumination device as described above, the linear light source 2 is disposed directly below the liquid crystal display panel 1 as the display, so if the light source 2 is a point light source, Compared to the above, there is an advantage that a relatively large area can be illuminated with relatively strong light, and the loss of the used light a2 is small.
しかし、例えば前記のような線状光ａ２の端部２ｂに、
非発光部もしくは中央の発光部１ａよりも光の弱い弱発
光部が存在する場合には、表示バネルｌの中央部１ａは
、バノクライトが強く、端部１ｂはバックライトが弱く
、場所によって表示コントラストにムラを生しる。第１
１図は前記第９図および第１０図の従来例の表示体用照
明装置に於いて、バックライト照明のムラを生した表示
外観例である．表示パネル１の中心部１ａは照明強度が
強く、端部１ｂは弱い。そのため表示中のｒＡＭＪや「
３」の部分は暗く、ｒ５：４」の部分は明るいので、美
観が損なわれる。However, for example, at the end 2b of the linear light a2 as described above,
If there is a non-light-emitting part or a weak light-emitting part with weaker light than the central light-emitting part 1a, the central part 1a of the display panel l has strong banochrite, the end part 1b has a weak backlight, and the display contrast varies depending on the location. This causes unevenness. 1st
FIG. 1 is an example of the appearance of a display with uneven backlight illumination in the conventional display illumination device shown in FIGS. 9 and 10. The center portion 1a of the display panel 1 has a strong illumination intensity, and the end portions 1b have a weak illumination intensity. Therefore, the displayed rAMJ and
3'' is dark and the r5:4'' portion is bright, which spoils the aesthetic appearance.
上記表示パネル１の中心部１ａと端部１ｂの照明ムラは
、光ａ２を表示パネル１から遠ざけるほど緩和されるが
、全体的に暗くなり、又、若干のムラは残ってしまう。The illumination unevenness at the center portion 1a and end portions 1b of the display panel 1 is alleviated as the light a2 is moved away from the display panel 1, but the whole becomes darker and some unevenness remains.
しかも装置全体として厚くなってしまう．又発光部２ａ
を表示バネル１の見切りの長さだけ長いものを使用する
と、非発光部ｌｂは表示パネルｌの両サイド方向に突き
出てしまい、表示パ不ルｌに比較して、バンクライト部
が大きくなり、効率が悪く、しかも装置が全体として大
きくなってしまう等の不具合があった。Moreover, the entire device becomes thicker. Also, the light emitting part 2a
If a display panel 1 that is as long as the end of the display panel 1 is used, the non-light-emitting part lb will protrude toward both sides of the display panel l, and the bank light part will become larger than the display panel l. There were problems such as poor efficiency and the overall size of the device.
本発明は、上記の問題点を解消し、液晶表示パネル等の
表示体に均一な照明効果を与え、薄型・小型で、表示性
能のよい照明装置を提供することを目的とする．
〔課題を解決するための手段〕
上記の目的を達成するために本発明は以下の構成とした
ものである．即ち、表示体の裏面側に線状光源と反射体
とを配設し、その線状光源と上記表示体との間に不透明
の平面状光散乱体を配置してなる表示体用照明装置にお
いて、上記線状光源に近接する領域での上記光散乱体の
光散乱機能が他の領域よりも漸次大きくなるようにする
と共に、その光散乱体に接近させて線状光源を配置した
ことを特徴とする．
〔作 用〕
上記のように線状光源に近接する領域での上記光散乱体
の光散乱機能が他の領域よりも漸次大きくなるようにし
たことにより、線状光源から出た光は、その線状光渥に
近接する領域では、他の領域よりも、多くもしくは広く
敗乱されて表示体をより均一に照明することが可能とな
ると共に、表示体に対して光源を大きく離さなくても、
表示体上での照明強度を平均化することが可能となる。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, provide a uniform illumination effect to a display body such as a liquid crystal display panel, and provide a thin, compact illumination device with good display performance. [Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration. That is, in an illumination device for a display body, a linear light source and a reflector are arranged on the back side of the display body, and an opaque planar light scattering body is arranged between the linear light source and the display body. , characterized in that the light scattering function of the light scattering body in a region close to the linear light source becomes gradually larger than in other regions, and the linear light source is arranged close to the light scattering body. Suppose that [Function] By making the light scattering function of the light scattering body in the area close to the linear light source gradually larger than in other areas as described above, the light emitted from the linear light source is Areas close to the linear light beams are illuminated more or more widely than other areas, making it possible to illuminate the display object more uniformly and without having to place the light source far away from the display object. ,
It becomes possible to average the illumination intensity on the display body.
（実施例〕
以下、図に示す実施例に基づいて本発明を具体的に説明
する。(Example) Hereinafter, the present invention will be specifically described based on an example shown in the drawings.
第１図および第２図は本発明による表示体用照明装置の
第１の実施例を示す縦断正面図および縦断側面図であり
、前記第９図・第１０図と同一もしくは同様の機能を有
する部材には同一の符号を付して再度の説明を省略する
。1 and 2 are a longitudinal sectional front view and a longitudinal sectional side view showing a first embodiment of the display illumination device according to the present invention, and have the same or similar functions as the above-mentioned FIGS. 9 and 10. The same reference numerals are given to the members, and repeated explanations are omitted.
光散乱反射体９は、Ａｊ２，Ｆｅ、ステンレス等の金属
板、または金属板上にＡ２やＮｉ，Ａｇ等をメッキ、蒸
着、スパッタしたもの、または、内側の反射方向にボリ
カーボネート樹脂やアクリル樹脂等の透明プラスチック
導光体を形成して、外側に上記金属板や金属箔やアルミ
とプラスチックのラミネートシ一トを接着、機械的取付
、機械的圧力等で装着したもの、あるいはＡｌやＮｉ．
．Ａｇを導光体に蒸着やスパンタしたり、接着剤や塗料
中に混合し、塗ることにより構威される。The light scattering reflector 9 is made of a metal plate made of Aj2, Fe, or stainless steel, or a metal plate plated with A2, Ni, Ag, etc., or coated with polycarbonate resin or acrylic resin in the reflection direction on the inside. A transparent plastic light guide such as Al, Ni, etc. is formed, and the metal plate, metal foil, or laminate sheet of aluminum and plastic is attached to the outside by adhesion, mechanical attachment, mechanical pressure, etc., or an Al or Ni.
．． This can be achieved by vapor depositing or spuntering Ag on the light guide, or by mixing it with an adhesive or paint and applying it.
本発明の第１の実施例に於いては、線状光源２の長手方
向と平行する方向の乳白色の光散乱体１の中心部の厚さ
が端部よりも漸次厚くなるようにして光源中央部での光
散乱体の光散乱機能が漸次大きくなるようにしたもので
、その厚さ変化は光源側で構或され、表示パネル側は平
坦に形威されている．上記のように構成すると、前記の
ように光源の端部に弱発光部等がある場合にも照明ムラ
を解哨することができる。即ち、光散乱体ｌＯの中央部
は、発光強度の強い線状光源２の中心部２ａと近距離に
あるため強い光が当たり、光散乱体ｌＯの端部は非発光
または発光強度の弱い線状光源２の端部２ｂと近距離に
あり発光の中心部２ａと遠距離にあるため、当たる光が
弱いが、強い光の当たる光散乱体ｌＯの中央部は厚くな
っているため、光を散乱して端部に伝えると共に、中心
部の光強度は若干弱くなる．一方、散乱体ｌＯの端部に
於いては、厚さが薄いため光をよく通すと共に、中心で
散乱された光が伝えられ、光散乱強度が大きくなり光散
乱体１０の中心部と端部は照明強度がほぼ平均され均一
な光散乱強度を生ずる．従ってムラがなくなり比較的長
時間の照明あるいは常時照明において、観賞者に満足感
を与え、装飾効果も大きい．また本発明は、光源２と表
示体としての液晶表示パネルｌの距離が短くて済み、光
散乱体ｌＯの形を変えるだけなので、均一な照明効果を
与える液晶表示装置が、容易に薄型、小型化できる．
なお光源としては、従来のタングステンランプその他適
宜であるが、好ましくは冷陰極放電管を用いるとよい．
以下その理由を述べる。In the first embodiment of the present invention, the central part of the milky white light scattering body 1 in the direction parallel to the longitudinal direction of the linear light source 2 is gradually thicker than the end part. The light scattering function of the light scattering material gradually increases at the end of the screen, and its thickness changes on the light source side, while the display panel side is flat. With the above configuration, it is possible to eliminate uneven illumination even when there is a weak light emitting part or the like at the end of the light source as described above. That is, the central part of the light scattering body 1O is close to the central part 2a of the linear light source 2 with strong emission intensity, so it is exposed to strong light, and the end part of the light scattering body 1O is a line that does not emit light or has a weak emission intensity. Because it is close to the end 2b of the shaped light source 2 and far away from the center of light emission 2a, the light that hits it is weak, but the central part of the light scatterer 1O that hits the strong light is thick, so it As the light is scattered and transmitted to the edges, the light intensity at the center becomes slightly weaker. On the other hand, at the ends of the scatterer 10, the thickness is thin, so light can pass through it well, and the light scattered at the center is transmitted, increasing the light scattering intensity. The illumination intensity is approximately averaged and produces a uniform light scattering intensity. Therefore, there is no unevenness, and even in relatively long-term lighting or constant lighting, it gives a sense of satisfaction to the viewer and has a great decorative effect. Further, according to the present invention, the distance between the light source 2 and the liquid crystal display panel l serving as a display body is short, and the shape of the light scattering body lO is only changed. It can be converted into The light source may be a conventional tungsten lamp or other appropriate light source, but preferably a cold cathode discharge tube is used.
The reason is explained below.
この種の照明装置としては、一般に液晶表示パネル等の
表示体が薄型である特性を生かすため小型・薄型・低価
格で、かつ低消費電力を満足する必要性があり、かかる
光源はタングテンランプがよいとされてきたが、本発明
者等は冷陰極放電管に着目した．
タングステンランプは、第１に色温度が２０００゜Ｋ前
後であり、やや赤い発光分光特性をもち、液晶の透過分
光特性が赤い光を強調する傾向があるため、液晶のバノ
クライトとしては、見栄えや色合いが悪くなる不具合が
ある．また第２に、メーカーにより定義に若干の差異は
あるが、ランプの５割から８割が断線しない点灯寿命が
せいぜい数万時間であり、長時間点灯あるいは常時点灯
用として使用する場合には、ランプ交換を容易に行える
構造にする必要があり、構造が複雑になり、小型化に不
利になる。また、例えばランプ交換を容易にするために
ソケット等を使用すると、その分コストアップになる．
さらに照明面積が大きくなり、ランプの使用数が多くな
ると、そのうち１個が断線し、取替える確率が増大し、
より不利になる．また、線状光源とするには、フィラメ
ント部を線状にする必要があり長くなる程構造上無理が
かかるので、寿命や信頼性をより低下させる原因となる
．
これに対し、冷陰極放電管は、第１に断線寿命は定格で
使用する限り、ほぼ半永久的であり常時点灯した際、発
光強度が半減する時間も数万時間以上であり、光源交換
の必要性を生じない利点がある。また第２に発光色が白
であり、特に液晶のバンクライトとして使用した場合に
は、色合いが液晶とよく調和し、液晶の点灯状態がよく
栄え、バックライト装飾効果の大きい利点がある．この
為、特に色偏光板や色フィルターを使用した液晶のカラ
ー表示用やゲストホストタイプのカラー表示用のバック
ライトとして最適であり、相転位型やＤＳ型、ＤＴＮ型
のバックライトとしても適する．以上の理由により、常
時点灯用、あるいは長時間点灯用の装飾性のある液晶照
明用光源としては冷陰極放電管が好ましい。This type of lighting device generally needs to be small, thin, low cost, and satisfy low power consumption to take advantage of the characteristics of thin display bodies such as liquid crystal display panels, and such light sources are tungsten lamps. However, the present inventors focused on cold cathode discharge tubes. First, tungsten lamps have a color temperature of around 2000°K, and have slightly red emission spectral characteristics, and the transmission spectral characteristics of liquid crystals tend to emphasize red light. There is a problem where it becomes worse. Second, although there are slight differences in the definition depending on the manufacturer, 50% to 80% of lamps have a lighting life of tens of thousands of hours at most without breaking, and when used for long periods of time or constant lighting, It is necessary to have a structure that allows easy lamp replacement, which complicates the structure and is disadvantageous to miniaturization. Furthermore, if a socket is used to facilitate lamp replacement, for example, the cost will increase accordingly.
Furthermore, as the lighting area becomes larger and the number of lamps used increases, the probability that one of them will break and will need to be replaced increases.
It becomes more disadvantageous. In addition, in order to use a linear light source, the filament must be made linear, and the longer the filament is, the more strain it places on the structure, which further reduces the lifespan and reliability. On the other hand, cold cathode discharge tubes have a short lifespan that is almost semi-permanent as long as they are used at the rated value, and when they are constantly lit, it takes more than tens of thousands of hours for the luminous intensity to be halved, making it necessary to replace the light source. It has the advantage of not causing any sexual problems. Secondly, the emitted light color is white, and especially when used as a bank light for a liquid crystal, the color harmonizes well with the liquid crystal, the lighting condition of the liquid crystal is well displayed, and the backlight has a great decorative effect. For this reason, it is especially suitable as a backlight for liquid crystal color displays using color polarizers or color filters, or for guest-host type color displays, and is also suitable as a backlight for phase change, DS, and DTN types. For the above reasons, a cold cathode discharge tube is preferable as a light source for decorative liquid crystal lighting for constant lighting or long lighting.
また第１図・第２図に示すように液晶表示パネル１と光
散乱体１０との間に必要に応じて半透過反射体１１を設
けるとよい．そのようにすると光源２を点灯させない昼
間の状態ではパネルｌ側から人射する光を半透過反射体
１ｌが反射させ、光源２を点灯させた状態では、バック
ライトを散乱、透過させる．このため周囲が明るい時に
は光［２を消してバックライトなしで表示し、暗いとき
のみ光源２を点灯させることができ、バックライトの消
費電力を小さくできる．また、半透過反射体ｌｌ自体に
も光散乱効果があり、光散乱体１０と重ねて使用するこ
とにより光のムラをより小さくできる．またバックライ
トの照度が強すぎる場合、半透過反射体１ｌの挿入によ
り液晶表示パネル１の照明する光の強さを適当に落とす
ことができる．第３図及び第４図は本発明の第２の実施
例の縦断正面図及び縦断側面図である．
本実施例が前記第１の実施例と異なるのは、線状光Ｂ２
の端部側にも反射体９ｂを一体的に設けた点である．上
記のように線状光源２の側方にも反射体９ｂを設けると
、線状光源２の端部に非発光部２ｂ等が存在する場合に
、上記端部の反射体９ｂで光散乱されるため、両端に発
光部が、あたかも存在したのと同様の効果かえられる．
従って、その分、光のムラがなく、光散乱体１０の製造
・製作も容易になり、また光散乱体ｌＯの中心部の厚さ
を薄くできる．その結果、バックライト部を薄くでき、
全体として薄型・小型の照明装置を構成できる．また、
端部の光散乱反射体９ｂの存在する分、光のロスをなく
す効率が向上する。Further, as shown in FIGS. 1 and 2, a transflector 11 may be provided between the liquid crystal display panel 1 and the light scatterer 10, if necessary. In this way, during the daytime when the light source 2 is not turned on, the semi-transparent reflector 1l reflects the light emitted from the panel l side, and when the light source 2 is turned on, the backlight is scattered and transmitted. Therefore, when the surroundings are bright, the light source 2 can be turned off to display without a backlight, and the light source 2 can be turned on only when it is dark, reducing the power consumption of the backlight. Further, the semi-transparent reflector 11 itself has a light scattering effect, and by using it in combination with the light scattering body 10, the unevenness of light can be further reduced. Furthermore, if the illuminance of the backlight is too strong, the intensity of the light illuminating the liquid crystal display panel 1 can be appropriately reduced by inserting the transflector 1l. 3 and 4 are a vertical front view and a vertical side view of a second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the linear light B2
The point is that a reflector 9b is also integrally provided on the end side. If the reflector 9b is also provided on the side of the linear light source 2 as described above, when there is a non-light emitting part 2b etc. at the end of the linear light source 2, light will be scattered by the reflector 9b at the end. As a result, the effect is the same as if there were light-emitting parts at both ends.
Therefore, there is no unevenness in the light, and the manufacture and manufacture of the light scattering body 10 is facilitated, and the thickness of the central portion of the light scattering body 10 can be reduced. As a result, the backlight part can be made thinner,
As a whole, a thin and compact lighting device can be constructed. Also,
The presence of the light scattering reflector 9b at the end improves the efficiency of eliminating light loss.
第５図および第６図は、本発明の第３の実施例の縦断正
面図および縦断側面図である。5 and 6 are a vertical front view and a vertical side view of a third embodiment of the present invention.
本実施例が前記の第２の実施例と異なる点は光散乱体１
０の形状であり、他の構威は前記例と同様である．
その光散乱体１０は、第７図及び第８図に示すように、
線状光源２の長手方向と平行する方向の厚さを、中心部
は厚く、端部は漸次薄くなるようにすると共に、線状光
源２と交差する方向の厚さも、中心部は厚く、端部は漸
次薄くなるようにして、上記両方向における光散乱機能
を変化させたものである．
一般に、線状光ｉ１［２の発光する部分の径が、表示バ
ネル１の側面の見切り幅に比べて小さいときには、表示
パネル１の見切り内で、線状光源２の長手方向と交差す
る方向に照明ムラが出やすい．第１２図は前記従来例に
おける表示状態の一例を示す平面図であり、ｒＡＭ
５：４５Ｊの表示の上下部分１ｄは暗く、中心部分１ｃ
は明るくなっている．ここで、線状光源２を表示パネル
１から遠ざければ、照明ムラは緩和されるが、やはり若
干残ってしまい、また、装置全体が厚くなってしまう．
ところが、上記のように、線状光源２と交差する方向の
光散乱体ｌＯの厚さを、光源に近い中心部は厚く、光源
から遠い端部は薄くすることにより、前記第１図・第２
図例の場合とほぼ同様の理由で、線状光源と直交方向の
照明ムラをもなくすことができ、表示性能および装飾効
果の大きい表示体用照明装置を提供することができる。This embodiment differs from the second embodiment described above in that the light scattering body 1
0 shape, and the other structure is the same as in the previous example. The light scattering body 10, as shown in FIGS. 7 and 8,
The thickness in the direction parallel to the longitudinal direction of the linear light source 2 is set to be thick at the center and gradually thinner at the ends, and the thickness in the direction intersecting the linear light source 2 is set to be thick at the center and gradually thinner at the ends. The light scattering function in both directions is changed by making the part gradually thinner. Generally, when the diameter of the emitting portion of the linear light i1[2 is smaller than the width of the side wall of the display panel 1, the light emitting portion of the linear light i1[2 is generally Uneven lighting tends to occur. FIG. 12 is a plan view showing an example of the display state in the conventional example;
The upper and lower parts 1d of the display at 5:45J are dark, and the central part 1c
is getting brighter. Here, if the linear light source 2 is moved away from the display panel 1, the illumination unevenness will be alleviated, but some light will still remain, and the entire device will become thicker. However, as described above, by making the thickness of the light scattering body lO in the direction intersecting the linear light source 2 thick at the center near the light source and thin at the end far from the light source, 2
For almost the same reason as in the illustrated example, it is possible to eliminate uneven illumination in the direction orthogonal to the linear light source, and it is possible to provide a display illumination device with great display performance and decorative effect.
以上説明したように、本発明は表示体の裏面側に線状光
源と反射体とを配設し、その線状光源と上記表示体との
間に不透明の平面状光散乱体を配宣してなる表示体用照
明装置において、上記線状光源に近接する領域での上記
光散乱体の光散乱機能が他の領域よりも漸次大きくなる
ようにしたから、線状光源から出た光は、その線状光源
に近接する領域では、他の領域よりも、多くもしくは広
く散乱されて表示体をより均一に照明することが可能と
なると共に、光源に対応する表示面が明るく目立ってし
まうのを防ぐことができる．また、表示体に対して光源
を接近させた状熊で表示体上での照明強度を平均化する
ことができるので小型で表示性能の優れた表示体用照明
装置を提供できる等の効果がある．As explained above, the present invention arranges a linear light source and a reflector on the back side of a display body, and places an opaque planar light scattering body between the linear light source and the display body. In the illumination device for a display body, the light scattering function of the light scattering body in a region close to the linear light source is made to gradually become larger than in other regions, so that the light emitted from the linear light source is In the area close to the linear light source, the light is scattered more or more widely than in other areas, making it possible to illuminate the display more uniformly and preventing the display surface corresponding to the light source from becoming bright and conspicuous. It can be prevented. In addition, since the illumination intensity on the display body can be averaged by bringing the light source close to the display body, it is possible to provide a lighting device for display bodies that is small and has excellent display performance. ．．
第１図は本発明による表示体用照明装置の第ｌ実施例の
縦断正面図、第２図はその縦断側面図、第３図は第２実
施例の縦断正面図、第４図はその縦断側面図、第５図は
第３実施例の縦断正面図、第６図はその縦断側面図、第
７図は光散乱体の正面図、第８図はその側面図、第９図
は従来の表示体用照明装置の縦断正面図、第１０図はそ
の縦断側面図、第１１図及び第１２図はそれぞれ従来の
表示体用照明装置による表示状態の一例を示す平面図で
ある。
１は表示体（液晶表示パネル）、
９は反射体、１０は光散乱体．
２は線状光源、
第
１
図
第
２
図
第
５図
第
６図
第
７
図
第
８図
５二＝：ニフ
１０
玉日７
１０
第
３
図
２ｂ
第９図
第１１図
１＼
避圏
吾−−
第
４
図
第１０図
第１２図FIG. 1 is a longitudinal sectional front view of a first embodiment of a display illumination device according to the present invention, FIG. 2 is a longitudinal sectional side view thereof, FIG. 3 is a longitudinal sectional front view of the second embodiment, and FIG. 4 is a longitudinal sectional view thereof. 5 is a vertical sectional front view of the third embodiment, FIG. 6 is a longitudinal sectional side view thereof, FIG. 7 is a front view of the light scattering body, FIG. 8 is a side view thereof, and FIG. 9 is a conventional one. FIG. 10 is a longitudinal sectional front view of the display illumination device, FIG. 10 is a longitudinal sectional side view thereof, and FIGS. 11 and 12 are plan views each showing an example of a display state by a conventional display illumination device. 1 is a display body (liquid crystal display panel), 9 is a reflector, and 10 is a light scatterer. 2 is a linear light source. - Figure 4 Figure 10 Figure 12
Claims (3)
その線状光源と上記表示体との間に不透明の平面状光散
乱体を配置してなる表示体用照明装置において、上記線
状光源に近接する領域での上記光散乱体の光散乱機能が
他の領域よりも漸次大きくなるようにすると共に、その
光散乱体に接近させて線状光源を配置したことを特徴と
する表示体用照明装置。(1) A linear light source and a reflector are arranged on the back side of the display body,
In a lighting device for a display body in which an opaque planar light scattering body is arranged between the linear light source and the display body, the light scattering function of the light scattering body in a region close to the linear light source is 1. An illumination device for a display, characterized in that a linear light source is arranged so as to be gradually larger than other areas and close to the light scattering body.
の厚さが両端部よりも漸次厚くなるようにして線状光源
中央部における光散乱体の光散乱機能が漸次大きくなる
ようにしたことを特徴とする特許請求の範囲第（１）項
記載の表示体用照明装置。(2) The light scattering body is configured such that the thickness of the central part in the longitudinal direction of the linear light source becomes gradually thicker than that of both ends, so that the light scattering function of the light scattering body in the central part of the linear light source gradually increases. An illumination device for a display according to claim (1), characterized in that:
方向における該線状光源に近接する領域の厚さが他の領
域よりも漸次厚くなるようにして線状光源に近接する領
域での光散乱体の光散乱機能が漸次大きくなるようにし
たことを特徴とする特許請求範囲第（１）項記載または
第（２）項記載の表示体用照明装置。(3) The light scattering body is arranged in a region adjacent to the linear light source such that the thickness of the region adjacent to the linear light source in a direction perpendicular to the longitudinal direction of the linear light source becomes gradually thicker than other regions. An illumination device for a display body according to claim 1 or claim 2, wherein the light scattering function of the light scattering body gradually increases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010226A JPH0348281A (en) | 1990-01-19 | 1990-01-19 | Illuminating device for display body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010226A JPH0348281A (en) | 1990-01-19 | 1990-01-19 | Illuminating device for display body |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8705680A Division JPS5713478A (en) | 1980-03-24 | 1980-06-26 | Back light structure for display unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0348281A true JPH0348281A (en) | 1991-03-01 |
| JPH0555853B2 JPH0555853B2 (en) | 1993-08-18 |
Family
ID=11744369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010226A Granted JPH0348281A (en) | 1990-01-19 | 1990-01-19 | Illuminating device for display body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0348281A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5124067A (en) * | 1988-12-15 | 1992-06-23 | Mitsui Toatsu Chemicals, Incorporated | Near infrared absorbers and display/recording materials using the same |
| JPH05173133A (en) * | 1991-12-25 | 1993-07-13 | Sharp Corp | Lighting device for liquid crystal |
| US8935885B2 (en) | 2010-04-12 | 2015-01-20 | Shiroki Corporation | Coupled structure and window regulator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54105562A (en) * | 1978-02-07 | 1979-08-18 | Seiko Instr & Electronics Ltd | Reflecting plate for liquid crystal panel |
| JPS575661U (en) * | 1980-06-11 | 1982-01-12 |
-
1990
- 1990-01-19 JP JP2010226A patent/JPH0348281A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54105562A (en) * | 1978-02-07 | 1979-08-18 | Seiko Instr & Electronics Ltd | Reflecting plate for liquid crystal panel |
| JPS575661U (en) * | 1980-06-11 | 1982-01-12 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5124067A (en) * | 1988-12-15 | 1992-06-23 | Mitsui Toatsu Chemicals, Incorporated | Near infrared absorbers and display/recording materials using the same |
| JPH05173133A (en) * | 1991-12-25 | 1993-07-13 | Sharp Corp | Lighting device for liquid crystal |
| US8935885B2 (en) | 2010-04-12 | 2015-01-20 | Shiroki Corporation | Coupled structure and window regulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0555853B2 (en) | 1993-08-18 |
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