JPH04225324A - Illuminating apparatus for liquid crystal - Google Patents
Illuminating apparatus for liquid crystalInfo
- Publication number
- JPH04225324A JPH04225324A JP2407827A JP40782790A JPH04225324A JP H04225324 A JPH04225324 A JP H04225324A JP 2407827 A JP2407827 A JP 2407827A JP 40782790 A JP40782790 A JP 40782790A JP H04225324 A JPH04225324 A JP H04225324A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- liquid crystal
- diffuser plate
- brightness
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 22
- 238000009792 diffusion process Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 101000582320 Homo sapiens Neurogenic differentiation factor 6 Proteins 0.000 description 1
- 102100030589 Neurogenic differentiation factor 6 Human genes 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、透過型液晶パネルを背
面より照射する液晶用照明装置（液晶パネル用バツクラ
イト）に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal lighting device (liquid crystal panel backlight) for illuminating a transmissive liquid crystal panel from the back side.
【０００２】0002
【従来の技術】近年、ラツプトツプ型パーソナルコンピ
ユータ等の表示装置として、薄型のバツクライト機構を
有する表示装置が多く用いられている。2. Description of the Related Art In recent years, display devices having a thin backlight mechanism have been widely used as display devices for laptop-type personal computers and the like.
【０００３】現在、これらの液晶用照明装置（バツクラ
イト）は、図５の如く、液晶表示板（パネル）１の後方
（直下）に複数個の冷陰極管や熱陰極管等の光源（蛍光
ランプ）２を配し、それらの複数個の光源２の前方に光
調整用フイルム（ライテイングカーテン）３と光拡散性
機能を有する拡散板４を取り付けていた。このバツクラ
イト型の照明装置の構造は、特に、カラーＬＣＤユニツ
ト用の高輝度対応システムとして多く用いられている。At present, these LCD lighting devices (backlights) include a plurality of light sources such as cold cathode tubes and hot cathode tubes (fluorescent lamps) behind (directly below) the liquid crystal display board (panel) 1, as shown in FIG. ) 2, and a light adjusting film (lighting curtain) 3 and a diffusion plate 4 having a light diffusing function were attached in front of the plurality of light sources 2. This backlight type lighting device structure is often used as a high-brightness compatible system, especially for color LCD units.
【０００４】なお、図中５は、光源２からの後方および
側方への光を前方へ反射させる反射部である。[0004] Reference numeral 5 in the figure is a reflecting portion that reflects the light from the light source 2 toward the rear and side toward the front.
【０００５】[0005]
【発明が解決しようとする課題】ところが、上記光源１
と光反射パターンを配した光量調整フイルム３を有する
、いわゆる直下型バツクライト方式では、複数のランプ
２同士の間の中央真上での拡散板表面輝度が最も輝度と
して低下する。このような構成において、ライテイング
カーテン３で拡散板上の輝度を均一化しようとする場合
に、この最も低いランプ間中央の輝度に平滑化されてし
まう。なぜならば、最も輝度の高いランプ２の真上にお
ける拡散板上の輝度は、ライテイングカーテン３に形成
した網点状のドツトパターンにより強制的に最も輝度の
低いランプ間中央部真上の拡散板４の輝度に平滑化され
るからである。[Problem to be solved by the invention] However, the light source 1
In the so-called direct type back light system, which has a light amount adjusting film 3 having a light reflection pattern, the surface brightness of the diffuser plate directly above the center between the plurality of lamps 2 is the lowest in brightness. In such a configuration, when attempting to equalize the brightness on the diffuser plate with the lighting curtain 3, the brightness will be smoothed to the lowest brightness in the center between the lamps. This is because the brightness on the diffuser plate directly above the lamp 2 with the highest brightness is forced by the dot pattern formed on the lighting curtain 3 to the diffuser plate 4 directly above the central part between the lamps with the lowest brightness. This is because the brightness is smoothed to .
【０００６】そのため、光の利用効率が低下し、特に、
近年益々要望されつつある低消費電力化カラーＬＣＤユ
ニツト対応の高輝度タイプのバツクライトシステムとし
ては最適なものと言えず、カラーＬＣＤユニツトで要求
される拡散板上での高輝度達成の立場から問題であつた
。[0006] As a result, the light utilization efficiency decreases, and in particular,
It cannot be said to be optimal as a high-brightness type backlight system compatible with the low power consumption color LCD units that have been increasingly requested in recent years, and there are problems from the standpoint of achieving high brightness on the diffuser plate required by color LCD units. It was hot.
【０００７】本発明は、上記課題に鑑み、光源同士の間
で照射し合うだけで、直接拡散板表面輝度として寄与し
なかつた光量を有効に拡散板表面輝度として利用し得る
液晶用照明装置の提供を目的とする。In view of the above-mentioned problems, the present invention provides an illumination device for a liquid crystal display that can effectively utilize the amount of light that does not directly contribute to the surface brightness of the diffuser plate by simply irradiating the light sources with each other as the surface brightness of the diffuser plate. For the purpose of providing.
【０００８】[0008]
【課題を解決するための手段】本発明による課題解決手
段は、図１ないし図４の如く、液晶表示板１１を後方か
ら照明する光源１２と、該光源１２からの後方への照射
光を液晶表示板１１側へ反射させる反射部１３と、前記
光源１２の前方に配され光源１２からの直接光および前
記反射部１３からの反射光を液晶表示板１１に拡散する
拡散板１４と、該拡散板１４の光量を均一化する光量調
整体１５とを備え、前記光源１２が複数個配置され、各
光源１２が発光体１６と、これを覆う外装管１７とから
なる液晶用照明装置において、前記各光源１２の外装管
１７の側部内面に、発光体１６から側方への光を反射さ
せる反射膜１８が形成され、該反射膜１８は、その反射
光を隣合う光源１２との間の拡散板１４上に照射するよ
う構成されたものである。[Means for Solving the Problems] As shown in FIGS. 1 to 4, the means for solving the problems according to the present invention includes a light source 12 that illuminates a liquid crystal display panel 11 from behind, and a light source 12 that illuminates a liquid crystal display panel 11 from behind. a reflector 13 that reflects the light toward the display panel 11; a diffuser 14 disposed in front of the light source 12 that diffuses direct light from the light source 12 and reflected light from the reflector 13 to the liquid crystal display panel 11; A liquid crystal lighting device comprising a light amount adjustment body 15 that equalizes the light amount of the plate 14, in which a plurality of the light sources 12 are arranged, and each light source 12 is composed of a light emitting body 16 and an exterior tube 17 covering the light source 16. A reflective film 18 is formed on the inner surface of the side of the exterior tube 17 of each light source 12 to reflect the light from the light emitter 16 to the side. It is configured to irradiate onto the diffuser plate 14.
【０００９】[0009]
【作用】上記課題解決手段において、使用時には、光源
１２からの前方への光は直接、光源１２からの後方への
光は反射部１３にて一旦反射された後、光量調整体１５
にて前方に配光され、さらに拡散板１４にて拡散されて
表示板を後方から照射する。[Operation] In the above problem solving means, when in use, the forward light from the light source 12 is directly reflected, and the backward light from the light source 12 is once reflected by the reflection section 13, and then reflected by the light amount adjusting member 15.
The light is distributed to the front by the diffuser plate 14, and further diffused by the diffuser plate 14 to illuminate the display board from the rear.
【００１０】このとき、発光体１６から側方へ照射され
る光量は、従来隣合う光源１２同士の間で照射し合うだ
けで拡散板１４の表面輝度として有効に利用できなかつ
たが、この光を、外装管１７の側部内面の反射膜１８に
て反射させる。この反射された光は、外装管１７の前部
を通過する際に散乱し、この散乱光は光源１２間から拡
散板１４上に照射されて、輝度の最も低い部分の輝度ア
ツプに寄与する。At this time, the amount of light radiated laterally from the light emitters 16 was conventionally only irradiated between adjacent light sources 12 and could not be effectively used as surface brightness of the diffuser plate 14; is reflected by the reflective film 18 on the inner surface of the side portion of the outer tube 17. This reflected light is scattered when passing through the front part of the exterior tube 17, and this scattered light is irradiated onto the diffuser plate 14 from between the light sources 12, contributing to increasing the brightness of the lowest brightness part.
【００１１】[0011]
【実施例】以下、本発明の一実施例を図面に基づいて説
明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００１２】図１は本発明の一実施例を示す液晶用照明
装置の断面図、図２は同じくその光源から拡散板の裏面
への直接光の範囲を示す要部拡大断面図、図３は同じく
その光源から反射部で反射した成分光を示す要部拡大断
面図、図４は同じく光源と反射膜との関係を示す図であ
る。FIG. 1 is a cross-sectional view of a liquid crystal illumination device showing an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the main part showing the range of direct light from the light source to the back surface of the diffuser plate, and FIG. Similarly, FIG. 4 is an enlarged cross-sectional view of the main part showing component light reflected from the light source by the reflecting portion, and FIG. 4 is a diagram similarly showing the relationship between the light source and the reflective film.
【００１３】図示の如く、本実施例の液晶用照明装置は
、ラツプトツプ型パーソナルコンピユータ等に設けられ
るものであり、液晶表示板１１を後方から照明する光源
１２（蛍光ランプ）と、該光源１２からの後方への照射
光を液晶表示板１１側へ反射させる反射部１３と、前記
光源１２の前方に配され光源１２からの直接光および前
記反射部１３からの反射光を液晶表示板１１に拡散する
拡散板１４と、該拡散板１４の光量を均一化する光量調
整体１５とを備えている。As shown in the figure, the liquid crystal lighting device of this embodiment is installed in a laptop type personal computer, etc., and includes a light source 12 (fluorescent lamp) that illuminates a liquid crystal display panel 11 from the rear, and a light source 12 (fluorescent lamp) that illuminates a liquid crystal display panel 11 from behind. a reflecting section 13 that reflects the light irradiated to the rear toward the liquid crystal display board 11; The light source includes a diffuser plate 14 for adjusting the light intensity of the diffuser plate 14, and a light amount adjusting body 15 for making the light intensity of the diffuser plate 14 uniform.
【００１４】前記光源１２は、図１の如く、発光体１６
（フイラメント）と、これを覆う外装管１７（蛍光管）
とからなる直管型の冷陰極管あるいは熱陰極管であり、
一定間隔で四個配置されている。The light source 12 includes a light emitter 16 as shown in FIG.
(filament) and the exterior tube 17 (fluorescent tube) that covers it
A straight cold cathode tube or hot cathode tube consisting of
Four are placed at regular intervals.
【００１５】そして、図４の如く、前記各光源１２の外
装管１７の側部内面に、発光体１６から側方への光を反
射させる円弧状の反射膜１８が形成され、該反射膜１８
は、その反射光が光源１２間から拡散板１４上に照射す
るよう構成されている。As shown in FIG. 4, an arcuate reflective film 18 is formed on the inner surface of the side of the outer tube 17 of each light source 12 to reflect the light emitted from the light emitter 16 to the side.
is configured so that the reflected light irradiates onto the diffuser plate 14 from between the light sources 12.
【００１６】該反射膜１８は、外装管１７の内面に塗布
された蛍光体であり、外装管１７の内面全部に塗布した
蛍光体を、所望の形成角度θの領域以外を除去して形成
されるアパーチヤ型のものである。The reflective film 18 is a phosphor coated on the inner surface of the outer tube 17, and is formed by removing the phosphor coated on the entire inner surface of the outer tube 17 except for a region having a desired formation angle θ. It is an aperture type.
【００１７】ここで、該反射膜１８の形成角度θは、従
来拡散板上の輝度として、反射部による反射成分も含め
ても有効に利用できなかった光量を、反射膜１８で反射
させ、拡散板上の輝度向上に有効に働くようにするため
、下記に示した角度範囲に設定されている。Here, the formation angle θ of the reflective film 18 is such that the amount of light that could not be effectively utilized as the luminance on the diffuser plate even including the component reflected by the reflecting portion is reflected by the reflective film 18 and diffused. In order to effectively improve the brightness on the board, the angle range is set as shown below.
【００１８】以下、光源ピッチＰ＝３２（ｍｍ）、光源
径Ｄ＝６．５ｍｍの場合につき説明する。The case where the light source pitch P=32 (mm) and the light source diameter D=6.5 mm will be explained below.
【００１９】１）光源１２から拡散板１４の裏面へ直接
達する光の角度範囲については、図２中の隣合う光源１
２の接線となる光Ｃ１の照射角度θ１より小さい範囲で
あればよい。このθ１は、光源１２の鉛直方向を基準と
する角度であり、図２において、横軸をｘ、縦軸をｙ、
原点を（０，０）とすると、一般に、
ｙ−ｔａｎ（９０°−θ１）・ｘ＝０
したがって、図２中、ｂ１は
ｂ１＝ｔａｎ（９０°−θ１）・Ｐ＝ｔａｎ（９０°−
θ１）・３２……（１）
また、Ｄ／２（光源１２の半径）は、1) Regarding the angular range of light directly reaching the back surface of the diffuser plate 14 from the light source 12, the adjacent light source 1 in FIG.
It is sufficient that the range is smaller than the irradiation angle θ1 of the light C1, which is the tangent to the angle θ1 of the light C1. This θ1 is an angle based on the vertical direction of the light source 12, and in FIG. 2, the horizontal axis is x, the vertical axis is y,
If the origin is (0,0), then in general, y-tan(90°-θ1)・x=0 Therefore, in FIG. 2, b1 is b1=tan(90°-θ1)・P=tan(90°-
θ1)・32...(1) Also, D/2 (radius of light source 12) is
【００２０】[0020]
【数１】[Math 1]
【００２１】（１），（２）式より、次の（３）式およ
びθ１の値を導くことができる。From equations (1) and (2), the following equation (3) and the value of θ1 can be derived.
【００２２】[0022]
【数２】[Math 2]
【００２３】２）蛍光管光源から反射部で反射した成分
光については、１）と同様にして、隣合う光源１２の接
線となる照射光Ｃ２の照射角度θ２より小さい範囲であ
ればよい。すなわち、図３において、横軸をｘ、縦軸を
ｙ、原点を（０，０）とすると、一般に、 ｙ−
ｔａｎ（９０°−θ２）・ｘ−（ｄ−Ｌ）｛１＋ｔａｎ
（９０°−θ２）・ｔａｎθ２｝＝０ ∴ｙ−ｔａｎ
（９０°−θ２）・ｘ−２・（ｄ−Ｌ）＝０ここで、ｄ
は光源１２の中心から光量調整体１５までの距離、Ｌは
反射部１３と光量調整体１５との距離である。2) As for the component light reflected from the fluorescent tube light source by the reflection section, as in 1), it suffices if the range is smaller than the irradiation angle θ2 of the irradiation light C2, which is tangent to the adjacent light source 12. That is, in FIG. 3, if the horizontal axis is x, the vertical axis is y, and the origin is (0,0), then generally, y-
tan (90°-θ2) x-(d-L) {1+tan
(90°-θ2)・tanθ2}=0 ∴y-tan
(90°-θ2)・x-2・(d-L)=0 where d
is the distance from the center of the light source 12 to the light amount adjustment body 15, and L is the distance between the reflection section 13 and the light amount adjustment body 15.
【００２４】したがつて、図３中、ｂ２は、また、Ｄ／
２（光源１２の半径）は、Therefore, in FIG. 3, b2 is also D/
2 (radius of light source 12) is
【００２５】[0025]
【数３】[Math 3]
【００２６】（４），（５）式より、次の（６）式を導
くことができる。From equations (4) and (5), the following equation (6) can be derived.
【００２７】[0027]
【数４】[Math 4]
【００２８】なお、（６）式を満たすθ２の解は二つ存
在するが、図３の如く、大きい解の方は、接線Ｃ３につ
いての角度であり、このＣ３からＣ２までの間の光線は
、反射部１３にて反射したとしても拡散板１４側へ照射
されず、拡散板１４上の輝度として寄与しない。したが
つて、（６）式を満たす小さい方の解をとることにして
おく。Note that there are two solutions for θ2 that satisfy equation (6), but as shown in FIG. 3, the larger solution is the angle about the tangent C3, and the ray between C3 and C2 is Even if the light is reflected by the reflection part 13, it is not irradiated to the diffuser plate 14 side and does not contribute to the brightness on the diffuser plate 14. Therefore, we will take the smaller solution that satisfies equation (6).
【００２９】１），２）より、反射膜１８を形成する角
度は、図４に示す通り、光源１２の鉛直方向から測定し
てθ１〜（１８０−θ２）の範囲である。From 1) and 2), the angle at which the reflective film 18 is formed is in the range of θ1 to (180−θ2) as measured from the vertical direction of the light source 12, as shown in FIG.
【００３０】なお、θ１とθ２の関係は、図４の如く、
θ１＞θ２となり、該反射膜１８は、その後部よりも前
方の方が開放するように形成されている。Note that the relationship between θ1 and θ2 is as shown in FIG.
θ1>θ2, and the reflective film 18 is formed so that its front side is more open than its rear side.
【００３１】なお、上述のθ１およびθ２の角度範囲は
、最小の角度範囲としての例であり、光源鉛直方向に対
してある微少な角度に両端部を広げて形成することも可
能である。一般に、光源ピッチがＰ（ｍｍ）、光源径が
Ｄ（ｍｍ）の場合については、（３），（６）式は下記
の（７），（８）式のようになり、角度範囲が同時に決
定される。Note that the angle ranges of θ1 and θ2 mentioned above are examples of the minimum angle ranges, and it is also possible to widen both ends to a certain minute angle with respect to the vertical direction of the light source. Generally, when the light source pitch is P (mm) and the light source diameter is D (mm), equations (3) and (6) become as shown in equations (7) and (8) below, and the angular range is It is determined.
【００３２】[0032]
【数５】[Math 5]
【００３３】前記反射部１３は、図１の如く、前記複数
個の光源１２を収納するよう前面開放の箱形に形成され
、その側壁は、光源１２からの光を前方に反射するよう
傾斜して形成されている。As shown in FIG. 1, the reflecting section 13 is formed into a box shape with an open front so as to accommodate the plurality of light sources 12, and its side walls are inclined so as to reflect the light from the light sources 12 forward. It is formed by
【００３４】前記拡散板１４は、例えば乳白色の半透明
アクリルが使用され、長方形の平板状に形成され、表示
板の後方に表示板と平行に配される。The diffusion plate 14 is made of, for example, milky-white translucent acrylic, is formed into a rectangular flat plate, and is disposed behind the display panel and parallel to the display panel.
【００３５】前記光量調整体１５は、１８８μｍのポリ
エチレンテレフタレート（ＰＥＴ）シートの上に、前記
光源１２の取り付け位置にあわせてアルミニウム蒸着に
よりドツトパターンを形成したフイルム状のライテイン
グカーテンである。The light amount adjusting member 15 is a film-like lighting curtain in which a dot pattern is formed on a 188 μm polyethylene terephthalate (PET) sheet by aluminum vapor deposition in accordance with the mounting position of the light source 12.
【００３６】上記構成の液晶用照明装置において、使用
時に光源１２を発光させると、光源１２からの前方への
光は直接、光源１２からの後方への光は反射部１３にて
一旦反射された後、光量調整体１５にて前方に均一に配
光され、さらに拡散板１４にて拡散されて表示板を後方
から照射する。In the liquid crystal illumination device having the above structure, when the light source 12 is made to emit light during use, the light emitted from the light source 12 toward the front is directly reflected, and the light emitted from the light source 12 toward the rear is once reflected by the reflection section 13. After that, the light is uniformly distributed forward by the light amount adjustment body 15, and further diffused by the diffuser plate 14 to illuminate the display board from the rear.
【００３７】このとき、光源１２の外装管１７の側方内
面に設けた円弧状の反射膜は、図２，３の如く、従来、
複数の光源１２同士の間で照射し合うだけで拡散板１４
の表面輝度として有効に利用できなかつた光量を、光源
１２の外装管１７の内部で反射させる。At this time, the arc-shaped reflective film provided on the lateral inner surface of the exterior tube 17 of the light source 12 is as shown in FIGS.
Just by irradiating each other between multiple light sources 12, the diffuser plate 14
The amount of light that cannot be effectively used as surface brightness is reflected inside the exterior tube 17 of the light source 12.
【００３８】ここで、図４の如く、反射膜１８は、その
後部よりも前部の方が開放するよう形成されていること
から、特に発光体１６からの斜め後方への光は、反射膜
１８にてそのまま外装管１７の斜め前方へ反射される。
そして、この光は、外装管１７の前部を通過する際に散
乱しながら、光源１２の斜め前方向を中心に照射され、
拡散板１４の輝度が最も低い部分の輝度アツプに寄与す
る。したがつて、拡散板１４の輝度を全体的に向上させ
ることができる。Here, as shown in FIG. 4, since the reflective film 18 is formed so that the front part thereof is more open than the rear part, the light from the light emitting body 16 diagonally backward is transmitted through the reflective film. At 18, the light is directly reflected diagonally forward of the exterior tube 17. Then, this light is scattered while passing through the front part of the exterior tube 17, and is irradiated mainly in the diagonally forward direction of the light source 12.
This contributes to increasing the brightness of the portion of the diffuser plate 14 where the brightness is lowest. Therefore, the overall brightness of the diffuser plate 14 can be improved.
【００３９】なお、本発明は、上記実施例に限定される
ものではなく、本発明の範囲内で上記実施例に多くの修
正および変更を加え得ることは勿論である。It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.
【００４０】例えば、上記実施例では、反射膜１８は円
弧状に形成されていたが、これに限るものでなく、例え
ば、外装管１７の一部を平板状に形成し、これに従つて
反射膜１８をも平板状に形成してもよい。For example, in the above embodiment, the reflective film 18 is formed in an arc shape, but the present invention is not limited to this. For example, a part of the exterior tube 17 may be formed in a flat plate shape, and the reflective film 18 can be formed in a flat shape accordingly. The membrane 18 may also be formed into a flat plate.
【００４１】[0041]
【発明の効果】以上の説明から明らかな通り、本発明に
よると、複数の光源の外装管の側部内面に反射膜を形成
しているので、従来複数の同士の間で照射し合うだけで
拡散板の表面輝度として有効に利用できなかつた光を、
光源間から拡散板上に照射することができる。したがつ
て、光源の斜め前方向の光量を向上させ、拡散板の輝度
の最も低い部分の輝度を向上させることにより全体的な
輝度を向上させ得るといつた優れた効果がある。[Effects of the Invention] As is clear from the above explanation, according to the present invention, a reflective film is formed on the inner surface of the side of the exterior tube of a plurality of light sources, so that conventionally, only a plurality of light sources irradiate each other. The light that could not be used effectively as surface brightness of the diffuser plate is
The light can be irradiated onto the diffuser plate from between the light sources. Therefore, there is an excellent effect that the overall brightness can be improved by increasing the amount of light diagonally in front of the light source and improving the brightness of the lowest brightness portion of the diffuser plate.
【図１】図１は本発明の一実施例を示す液晶用照明装置
の断面図である。FIG. 1 is a sectional view of a liquid crystal lighting device showing one embodiment of the present invention.
【図２】図２は同じくその光源から拡散板の裏面への直
接光の範囲を示す要部拡大断面図である。FIG. 2 is an enlarged sectional view of a main part showing the range of direct light from the light source to the back surface of the diffuser plate.
【図３】図３は同じくその光源から反射部で反射した成
分光を示す要部拡大断面図である。FIG. 3 is an enlarged cross-sectional view of a main part showing component light reflected from the light source by a reflecting section.
【図４】図４は同じく光源と反射膜との関係を示す図で
ある。FIG. 4 is a diagram similarly showing the relationship between a light source and a reflective film.
【図５】図５は従来の液晶用照明装置の断面図である。FIG. 5 is a cross-sectional view of a conventional LCD lighting device.
１１ 液晶表示板 １２ 光源 １３ 反射部 １４ 拡散板 １５ 光量調整体 １６ 発光体 １７ 外装管 １８ 反射膜 11 Liquid crystal display board 12 Light source 13 Reflection part 14 Diffusion plate 15 Light amount adjustment body 16 Luminous body 17 Exterior pipe 18 Reflective film
Claims (1)
、該光源からの後方への照射光を液晶表示板側へ反射さ
せる反射部と、前記光源の前方に配され光源からの直接
光および前記反射部からの反射光を液晶表示板に拡散す
る拡散板と、該拡散板の光量を均一化する光量調整体と
を備え、前記光源が複数個配置され、各光源が発光体と
、これを覆う外装管とからなる液晶用照明装置において
、前記各光源の外装管の側部内面に、発光体から側方へ
の光を反射させる反射膜が形成され、該反射膜は、その
反射光を隣合う光源との間の拡散板上に照射するよう構
成されたことを特徴とする液晶用照明装置。1. A light source that illuminates a liquid crystal display board from the rear, a reflecting part that reflects backward irradiation light from the light source toward the liquid crystal display board, and a reflecting part arranged in front of the light source that illuminates the direct light from the light source and A diffuser plate that diffuses the reflected light from the reflective section to the liquid crystal display board, and a light amount adjuster that equalizes the light amount of the diffuser plate, a plurality of the light sources are arranged, and each light source includes a light emitting body and a light emitting body. In the LCD lighting device, a reflective film is formed on the inner surface of the side of the exterior tube of each light source to reflect light from the light emitter to the side, and the reflective film reflects the reflected light. What is claimed is: 1. A lighting device for a liquid crystal display, characterized in that the lighting device is configured to irradiate light onto a diffuser plate between adjacent light sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2407827A JPH04225324A (en) | 1990-12-27 | 1990-12-27 | Illuminating apparatus for liquid crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2407827A JPH04225324A (en) | 1990-12-27 | 1990-12-27 | Illuminating apparatus for liquid crystal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04225324A true JPH04225324A (en) | 1992-08-14 |
Family
ID=18517366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2407827A Pending JPH04225324A (en) | 1990-12-27 | 1990-12-27 | Illuminating apparatus for liquid crystal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04225324A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479275A (en) * | 1993-12-03 | 1995-12-26 | Ois Optical Imaging Systems, Inc. | Backlit liquid crystal display with integral collimating, refracting, and reflecting means which refracts and collimates light from a first light source and reflects light from a second light source |
| US6111622A (en) * | 1993-03-12 | 2000-08-29 | Ois Optical Imaging Systems, Inc. | Day/night backlight for a liquid crystal display |
| KR100317882B1 (en) * | 1999-12-21 | 2001-12-24 | 양근창 | Plane light source unit and method for manufacturing hologram waveguide plate used for the same |
| KR100385692B1 (en) * | 1999-11-26 | 2003-05-27 | 주식회사 광운디스플레이기술 | Fluorescent Lamp Planar-Array Type LCD Back-Light |
| KR100685086B1 (en) * | 2003-03-27 | 2007-02-22 | 엔이씨 엘씨디 테크놀로지스, 엘티디. | Backlight Unit in a Liquid Crystal Display Device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6263786A (en) * | 1985-09-11 | 1987-03-20 | エ−・デ−・シユアルウエツヒテル・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング・ウント・コンパニ−・コマンデイトゲゼルシヤフト | Pivot mechanism of separable car door |
-
1990
- 1990-12-27 JP JP2407827A patent/JPH04225324A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6263786A (en) * | 1985-09-11 | 1987-03-20 | エ−・デ−・シユアルウエツヒテル・ゲゼルシヤフト・ミト・ベシユレンクテル・ハフツング・ウント・コンパニ−・コマンデイトゲゼルシヤフト | Pivot mechanism of separable car door |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6111622A (en) * | 1993-03-12 | 2000-08-29 | Ois Optical Imaging Systems, Inc. | Day/night backlight for a liquid crystal display |
| US5479275A (en) * | 1993-12-03 | 1995-12-26 | Ois Optical Imaging Systems, Inc. | Backlit liquid crystal display with integral collimating, refracting, and reflecting means which refracts and collimates light from a first light source and reflects light from a second light source |
| KR100385692B1 (en) * | 1999-11-26 | 2003-05-27 | 주식회사 광운디스플레이기술 | Fluorescent Lamp Planar-Array Type LCD Back-Light |
| KR100317882B1 (en) * | 1999-12-21 | 2001-12-24 | 양근창 | Plane light source unit and method for manufacturing hologram waveguide plate used for the same |
| KR100685086B1 (en) * | 2003-03-27 | 2007-02-22 | 엔이씨 엘씨디 테크놀로지스, 엘티디. | Backlight Unit in a Liquid Crystal Display Device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4524255B2 (en) | Surface lighting device | |
| JP5475684B2 (en) | Lighting system, lighting fixture and backlight unit | |
| JPH07114024A (en) | Back light | |
| JP3086609B2 (en) | LCD lighting system | |
| JPH04225324A (en) | Illuminating apparatus for liquid crystal | |
| JP2004253354A (en) | Surface type lighting device | |
| JP2000010094A (en) | Backlight device | |
| JPH08146415A (en) | Back light unit | |
| JP3098297U (en) | Direct backlight unit | |
| JPH0550431U (en) | LCD lighting device | |
| JP2007095484A (en) | Backlight unit for liquid crystal display | |
| JP3494687B2 (en) | Backlight device for liquid crystal | |
| TW200410006A (en) | Direct backlight module | |
| JPH0772477A (en) | Illumination device | |
| JPH04338723A (en) | Back light source device for display and liquid crystal display device | |
| JPH06235825A (en) | Surface light source device | |
| JPH0593911A (en) | Illuminating device for liquid crystal | |
| JPH04275525A (en) | Liquid crystal display device with back light | |
| KR20090044330A (en) | Back light unit | |
| JPH0627463A (en) | Liquid crystal display device | |
| JPH04268506A (en) | Panel light emitting device | |
| JPH0527237A (en) | Liquid crystal illuminator | |
| CN216561320U (en) | Light-emitting component, backlight module and display device | |
| JP2617242B2 (en) | Display with backlight | |
| JP3271833B2 (en) | U-shaped line light source type surface emitting device |