JPH07225377A - Light guide device for light source of liquid crystal display element - Google Patents
Light guide device for light source of liquid crystal display elementInfo
- Publication number
- JPH07225377A JPH07225377A JP6016112A JP1611294A JPH07225377A JP H07225377 A JPH07225377 A JP H07225377A JP 6016112 A JP6016112 A JP 6016112A JP 1611294 A JP1611294 A JP 1611294A JP H07225377 A JPH07225377 A JP H07225377A
- Authority
- JP
- Japan
- Prior art keywords
- light guide
- light
- guide plate
- liquid crystal
- crystal display
- 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
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、量産性が特に優れた液
晶表示素子光源用導光装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide device for a light source of a liquid crystal display device, which is particularly excellent in mass productivity.
【０００２】[0002]
【従来の技術】液晶表示素子の光源、いわゆるバックラ
イトには、数本の蛍光灯を液晶表示素子の背後に配置
し、拡散板を介して液晶表示素子背面を照射させるもの
もあるが、上記構造は奥行きが大きくなることもあり、
特に高輝度を要求される場合以外には用いられず、通常
は、液晶表示素子背後の両端または一端の側方に棒状光
源（厚さを薄くしたいときは通常は冷陰極螢光灯）を配
設し、その光を、液晶表示素子裏面が一様な照度で照射
されるように、導光装置で導くようにしている。2. Description of the Related Art As a light source of a liquid crystal display element, that is, a so-called backlight, some fluorescent lamps are arranged behind the liquid crystal display element, and the back surface of the liquid crystal display element is illuminated through a diffusion plate. The structure may be deeper,
It is not used except when particularly high brightness is required, and usually a rod-shaped light source (usually a cold cathode fluorescent lamp if you want to reduce the thickness) is placed on the side of both ends or one end behind the liquid crystal display element. The light guide device guides the light so that the back surface of the liquid crystal display element is illuminated with uniform illuminance.
【０００３】この導光板（装置）として、以前は、光源
に接する端部の板厚が厚く、光源から遠ざかるにつれ次
第に薄くなり、かつ、表面に細かい凹凸（光を液晶表示
素子側へ屈折、放出させるため）を設けた透明なアクリ
ル樹脂板（ガラス板は加工困難、重いなどのために敬遠
された）などが用いられていたが、このようにアクリル
樹脂板などの表面に整形加工した導光板は、表示装置の
種類（仕様）が増加した場合など、工程管理の面からも
不便であるため、近年は、導光板そのものには均等な厚
さで表面が平らな透明アクリル板を用い、その裏に、光
源からの距離が遠くなるほど、その部位近傍の面積平均
反射率が高くなるようにした反射手段を配設したものが
用いられるようになってきた。具体的には、例えばガラ
ス粉末（屈折材）と、チタン白（反射率が高い酸化チタ
ン）と、透明接着剤とを混合した反射塗料（インキ）を
円形に所定値以上の厚さに塗布して、導光板の背面に到
達して導光板から外に洩れ出た光を液晶表示素子裏面方
向へ反射させるようにし、上記円形部の直径と、その分
布密度を変化させることによって液晶表示素子裏面のバ
ックライトによる照度を全面にわたって均一にしてい
る。上記のような方法ならば、使用材料はいつも同様
で、反射塗料の塗り方だけを仕様に応じて変えれば良い
ことになる。As this light guide plate (apparatus), the thickness of the end portion in contact with the light source has been thick, becomes thinner as the distance from the light source increases, and fine unevenness (light is refracted and emitted to the liquid crystal display element side) on the surface. A transparent acrylic resin plate (a glass plate was shunned because it is difficult to process, heavy, etc.) was used, but a light guide plate shaped on the surface of such an acrylic resin plate was used. Is inconvenient in terms of process control, such as when the type (specification) of the display device increases, so in recent years, a transparent acrylic plate with a uniform thickness and a flat surface is used for the light guide plate itself. On the other hand, it has come to be used that a reflection means is provided on the back so that the area average reflectance near the portion becomes higher as the distance from the light source increases. Specifically, for example, a reflective coating (ink) obtained by mixing glass powder (refractive material), titanium white (titanium oxide having a high reflectance), and a transparent adhesive is circularly applied to a thickness of a predetermined value or more. Then, the light reaching the back surface of the light guide plate and leaking out from the light guide plate is reflected toward the back surface of the liquid crystal display element, and the diameter of the circular portion and its distribution density are changed to change the back surface of the liquid crystal display element. Illumination by the backlight is made uniform over the entire surface. If the above method is used, the material used is always the same, and it suffices to change only how to apply the reflective paint according to the specifications.
【０００４】図２は上記従来例の側断面図で、図２
（ａ）は液晶表示素子背後の片側端部だけに光源を配置
した例を、図２（ｂ）は液晶表示素子背後の両側端部に
光源を配置した例を示す。図中、１はランプ（冷陰極蛍
光灯）、２はランプ反射シート、３は拡散シート、４は
透明板（導光板）、５は反射塗料、６は反射シートであ
る。反射塗料５はそれぞれ円形状に、その大きさや数
（分布密度）が所期の如く（拡散シート３の上に配置さ
れる図示してない液晶表示素子の裏面での照度が全面で
均一）なるようにシルクスクリーンプリント（謄写版印
刷）法で印刷されている。拡散シート３を通さずに上か
ら見ると、反射塗料５が印刷されている個所はその周囲
よりも一層明るく見える。反射シートはすべての光をな
るべく無駄なく利用して表示を明るくするためのもので
ある。FIG. 2 is a side sectional view of the above conventional example.
FIG. 2A shows an example in which the light source is arranged only on one side end portion behind the liquid crystal display element, and FIG. 2B shows an example in which the light source is arranged on both side end portions behind the liquid crystal display element. In the figure, 1 is a lamp (cold cathode fluorescent lamp), 2 is a lamp reflection sheet, 3 is a diffusion sheet, 4 is a transparent plate (light guide plate), 5 is a reflective paint, and 6 is a reflection sheet. Each of the reflective paints 5 has a circular shape, and its size and number (distribution density) are as expected (the illuminance on the back surface of the liquid crystal display element (not shown) disposed on the diffusion sheet 3 is uniform over the entire surface). It is printed by the silk screen printing method. When viewed from above without passing through the diffusion sheet 3, the portion where the reflective paint 5 is printed looks brighter than the surrounding area. The reflection sheet is for making the display bright by using all the light as little as possible.
【０００５】[0005]
【発明が解決しようとする課題】しかし、導光板の材料
に、ガラスを用いる場合は勿論、アクリル樹脂を用いる
通常の場合でも、実際には板厚が、薄い場合でも１ｍ
ｍ、厚い場合は１０ｍｍもあって、導光板は厚くて硬
い。したがって、このような導光板に反射塗料を塗布す
る作業は量産的には容易ではない。この反射塗料の場
合、厚さは所定値以上あれば問題ないが、反射塗料を塗
布した円形個所の形状や塗布した個所の分布密度がなる
べく正確な製品を量産しようとすると、印刷技術を利用
することが望ましいが、上記のように導光板が厚く硬い
ために、印刷技術としては最も原始的なシルクスクリー
ンプリント法くらいしか利用できず、この方法を用いる
にしても、生産性が低いという問題が残る。However, not only when glass is used as the material of the light guide plate, but also when the acrylic resin is used in the usual case or when the plate thickness is actually thin, it is 1 m.
If the thickness is m, the thickness is 10 mm, and the light guide plate is thick and hard. Therefore, the work of applying the reflective paint to such a light guide plate is not easy in mass production. In the case of this reflective paint, there is no problem if the thickness is a predetermined value or more, but if you try to mass-produce a product with the shape of the circular part coated with the reflective paint and the distribution density of the applied parts as accurate as possible, use printing technology However, since the light guide plate is thick and hard as described above, only the most primitive silk screen printing method can be used as a printing technique, and even if this method is used, the productivity is low. Remain.
【０００６】本発明は上記従来の導光装置の問題点を解
消し、上記反射塗料の塗布作業を効率良く実行できるよ
うにした液晶表示素子光源用導光装置を提供することを
課題とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a light guide device for a liquid crystal display element light source, which solves the problems of the conventional light guide device described above and enables the application work of the reflective paint to be efficiently performed.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に本発明においては、液晶表示素子背後の側方端部に配
設した棒状光源からの光を、液晶表示素子の背後に配置
した光透過率が高い物質よりなる均等な厚みの導光板に
入射させ、光源から導光板に入射された光のうち板の背
面に到達して洩れ出た光を、導光板背面各部位でそれぞ
れ液晶表示素子裏面方向へ、その部位が光源から遠くな
るのに従って、その部位での面積平均反射率が漸次高く
なるように反射させる手段を設け、液晶表示素子裏面で
一様な照度が得られるようにした液晶表示素子光源用導
光装置において、前記反射させる手段は、高い反射率を
有する反射性塗料の所定値以上の厚さの層を、導光板背
面に密着または接近させて、各部位それぞれで所期の反
射率が得られるような面積比率に分布させることにより
形成され、反射性塗料層を導光板背面に密着または接近
させて分布させるために、導光板に通常の方法で直接印
刷せずに、導光板とは別の可撓性薄膜に、あらかじめ反
射性塗料を所期の反射率分布が得られるように印刷して
おいたものを、その反射性塗料印刷面が導光板の背面に
密着するように透明な接着剤で接着させるか、又は、装
置の底板の内面全面に反射性塗料を塗布したのち、この
塗料が乾燥固化する前に、各部位で所望の反射率が得ら
れるように反射性塗料を分布配置すべき位置に、あらか
じめ貫通孔を穿設しておいた遮光性薄膜を前記底板内面
に圧着し、貫通孔位置以外の個所に塗布されていた反射
性塗料を貫通孔内に押し出させて、前記底板の内面に反
射性塗料が前記遮光性薄膜を介して所望の分布密度で塗
布されたものを形成させ、その遮光性薄膜表面が導光板
背面に密着するように透明な接着剤などで接着させるこ
とにした。In order to solve the above-mentioned problems, in the present invention, light from a rod-shaped light source arranged at a lateral end portion behind a liquid crystal display element is arranged behind a liquid crystal display element. The light incident on the light guide plate made of a material with high transmittance and having a uniform thickness, of the light incident on the light guide plate that reaches the back surface of the plate and leaks out, is displayed on the liquid crystal display at each part of the back surface of the light guide plate. A means for reflecting the area back surface of the liquid crystal display element was provided so that the area average reflectance of the area gradually increased as the area became farther from the light source toward the back surface of the element. In the light guide device for a liquid crystal display element light source, the means for reflecting is provided with a layer of a reflective coating material having a high reflectance and having a thickness of a predetermined value or more, which is brought into close contact with or close to the back surface of the light guide plate, and is arranged at each portion. You can get the reflectivity of the period In order to distribute the reflective paint layer in close contact with or close to the back surface of the light guide plate, it is not necessary to directly print on the light guide plate by another method. A flexible thin film is pre-printed with reflective paint so that the desired reflectance distribution can be obtained, and a transparent adhesive is used so that the printed surface of the reflective paint will adhere to the back surface of the light guide plate. After bonding or applying a reflective coating on the entire inner surface of the bottom plate of the device, the reflective coating should be distributed so that the desired reflectance can be obtained at each site before the coating dries and solidifies. At the position, a light-shielding thin film having a through hole pre-drilled is pressure-bonded to the inner surface of the bottom plate, and the reflective coating material applied at a position other than the position of the through hole is extruded into the through hole, so that the bottom plate Reflective paint on the inner surface through the light-shielding thin film To form those applied in distribution density of Nozomu, the light-shielding thin film surface has to be bonded with a transparent adhesive so as to be in close contact with the rear light guide plate.
【０００８】[0008]
【作用】本発明によれば、厚く硬い導光板に、直接、反
射性塗料を印刷法によって塗布することを避けて、印刷
技術的に遥かに扱い易い、導光板とは別の可撓性薄膜た
とえば紙やサランラップなどに反射性塗料を所望の反射
特性分布が得られるように印刷したものを導光板背面に
透明な接着剤で接着させるようにしたから、印刷の作業
性、効率性が格段に向上する、単に時間当り多数製作で
きるようになるというだけでなく、一般に印刷精度自体
も向上して、品質が良好になる。また、反射性塗料の性
質上、又は、反射塗料の塗布厚がやや厚いためなどで、
通常の印刷法では反射塗料を塗布した領域の輪郭を正確
に形成できないような場合には、遮光性薄膜たとえば黒
い薄い紙に、反射塗料を塗布すべき個所に対応する個所
にあらかじめ貫通孔を穿孔しておいて、導光装置の底板
の内面全面に反射性塗料を一様に塗布したのち、この塗
料が乾燥固化する前に、上記遮光性薄膜を上記底板の反
射性塗料を一様に塗布した内面に圧着して、貫通孔が存
在しない個所に塗布されていた反射性塗料を貫通孔位置
に押し出させたものを作り、その遮光性薄膜の表面を導
光板背面に密着させるようにする。この方法によれば、
遮光性薄膜に穿孔した貫通孔の位置や其の周縁部輪郭線
は正確に形成させることができるし、反射性塗料の塗布
厚は所定値以上あれば多少の厚さの相違は差支えないの
であるから、反射性塗料を塗布した領域の輪郭を正確に
形成させることが出来るという利点が得られる。According to the present invention, the flexible thin film different from the light guide plate is much easier to handle in the printing technique, avoiding the direct application of the reflective paint to the thick and hard light guide plate by the printing method. For example, by printing a reflective coating on paper or Saran wrap to obtain the desired distribution of reflective characteristics, and then bonding it to the back surface of the light guide plate with a transparent adhesive, the workability and efficiency of printing are significantly improved. Not only is it possible to improve the number of units to be manufactured per hour, but also the printing accuracy itself is generally improved and the quality is improved. Also, due to the nature of the reflective paint, or because the coating thickness of the reflective paint is slightly thick,
If the contour of the area coated with the reflective coating cannot be accurately formed by the normal printing method, through holes are pre-drilled in the light-shielding thin film, for example, black thin paper, at the location corresponding to the location where the reflective coating is to be applied. Then, after uniformly applying the reflective coating on the entire inner surface of the bottom plate of the light guide device, before the coating is dried and solidified, the light-shielding thin film is uniformly applied with the reflective coating on the bottom plate. The inner surface of the light-shielding film is pressure-bonded to the surface of the light-guiding plate so that the surface of the light-shielding thin film is brought into close contact with the back surface of the light-guide plate. According to this method
It is possible to accurately form the positions of the through holes drilled in the light-shielding thin film and the contour line of the peripheral portion thereof, and if the coating thickness of the reflective coating is a predetermined value or more, there may be some difference in thickness. Therefore, there is an advantage that the contour of the region coated with the reflective paint can be accurately formed.
【０００９】なお、特許公開公報によって、既に多くの
液晶表示素子光源に適した導光板や導光装置に関する技
術が開示されているが、いずれも導光板自体に乱反射層
を設け（取付け）ている。[0009] Although the patent publication has already disclosed a technique relating to a light guide plate and a light guide device suitable for many light sources of liquid crystal display elements, in all of them, a diffuse reflection layer is provided (attached) on the light guide plate itself. .
【００１０】[0010]
【実施例】図１（ａ）は本発明の第１実施例の側断面図
で、図中、１はランプ（冷陰極蛍光灯）、２はランプ反
射シート、３は拡散シート、４は透明なアクリル板より
なる導光板、５は反射塗料、６は反射シートである。こ
の第１実施例では、反射シート６は十分に薄く可撓性が
あり、その内面に導光板４の屈折率と同等以上の屈折率
をもつガラスビーズと、反射率の大きいチタン白（酸化
チタン）と、透明接着剤とを混合した白色塗料５を、所
期の反射率分布が得られるように（白色塗料印刷個所は
円形で、その直径は光源から遠い部位ほど大きく、その
面積当り分布密度は光源から遠い部位ほど密に）印刷し
てある。この反射シート６の反射塗料５を印刷した面が
導光板４に密着するように透明な接着剤で接着してあ
る。この実施例では、光源となるランプ１は片側だけに
しか設置してないが、両側に設置して液晶表示素子の表
示の輝度を高めることも勿論可能である。1 (a) is a side sectional view of a first embodiment of the present invention, in which 1 is a lamp (cold cathode fluorescent lamp), 2 is a lamp reflection sheet, 3 is a diffusion sheet, and 4 is transparent. A light guide plate made of an acrylic plate, 5 is a reflective paint, and 6 is a reflective sheet. In the first embodiment, the reflection sheet 6 is sufficiently thin and flexible, and the inner surface thereof has glass beads having a refractive index equal to or higher than that of the light guide plate 4, and titanium white (titanium oxide) having a high reflectance. ) And a transparent adhesive mixed with a white paint 5 so that the desired reflectance distribution can be obtained (the white paint printing spot is circular, and the diameter is larger at the part farther from the light source, and the distribution density per area is Is printed closer to the part farther from the light source). The surface of the reflective sheet 6 on which the reflective coating 5 is printed is adhered to the light guide plate 4 with a transparent adhesive. In this embodiment, the lamp 1 serving as the light source is installed only on one side, but it is of course possible to install the lamp 1 on both sides to enhance the display brightness of the liquid crystal display element.
【００１１】図１（ｂ）は本発明の第２実施例の側断面
図で、図中、１はランプ（冷陰極蛍光灯）、２はランプ
反射シート、３は拡散シート、４は透明なアクリル板よ
りなる導光板、５は反射塗料、６は反射シート、７は遮
光フィルムである。本実施例では、反射シート６はバッ
クライトの導光装置の底板となる。また、本実施例で使
用する反射塗料５の粘度は、第１実施例で使用するもの
よりも多少下げてある。遮光フィルム７には、反射塗料
を塗布すべき位置に対応する位置に、貫通孔が、あらか
じめ所期の反射特性分布が得られるように穿孔してあ
る。すなわち、その部位が光源から遠い個所では比較的
大きい孔が多数穿孔されており、光源から近い個所では
其の逆である。遮光フィルムが薄いから、貫通孔の形
状、寸法、密度などを正確に所望通りに穿孔することは
容易である。装置の底板となる反射シート６の内面に比
較的粘度の低い反射塗料５を均一に（ベタ）塗り、塗料
が乾燥固化する前に、その上に、上記のように穿孔した
遮光フィルム７を圧着する。そうすると、孔がないとこ
ろに塗られていた反射塗料５は穿孔部に押し出されてき
て場合によっては貫通孔を通り抜けて遮光フィルム７の
表面の側（導光板４の背面側）に出てくる。このように
なった反射シート６の遮光フィルム側を導光板４の背面
に密着させる。遮光フィルム７を導光板４の背面に密着
させるのに、通常は透明な接着剤を用いるが、反射塗料
５自体にも接着剤が含まれているから、貫通孔を通り抜
けて導光板４の側に押し出されてきた反射塗料の量によ
っては、特別に接着剤を用いないで反射塗料自体で接着
させることもできる。第２実施例では、反射塗料５を塗
布した個所の形状（輪郭）が、一般に第１実施例で印刷
による場合よりも正確になることは既述の通りである。FIG. 1 (b) is a side sectional view of a second embodiment of the present invention, in which 1 is a lamp (cold cathode fluorescent lamp), 2 is a lamp reflection sheet, 3 is a diffusion sheet, and 4 is transparent. A light guide plate made of an acrylic plate, 5 is a reflective paint, 6 is a reflective sheet, and 7 is a light-shielding film. In this embodiment, the reflection sheet 6 serves as the bottom plate of the light guide device of the backlight. Also, the viscosity of the reflective coating material 5 used in this embodiment is slightly lower than that used in the first embodiment. Through holes are formed in the light-shielding film 7 at positions corresponding to positions where the reflective coating should be applied so as to obtain a desired reflection characteristic distribution in advance. That is, a large number of relatively large holes are formed in the part far from the light source, and vice versa in the part close to the light source. Since the light-shielding film is thin, it is easy to form the through-holes exactly in the desired shape, size, density, etc. as desired. A relatively low-viscosity reflective paint 5 is evenly (solid) applied to the inner surface of a reflective sheet 6 that serves as the bottom plate of the apparatus, and the light-shielding film 7 perforated as described above is pressure-bonded to the paint before the paint dries and solidifies. To do. Then, the reflective coating material 5 applied to the place where there is no hole is extruded into the perforated portion and, in some cases, passes through the through hole and appears on the front surface side of the light shielding film 7 (back surface side of the light guide plate 4). The light-shielding film side of the reflection sheet 6 thus configured is brought into close contact with the back surface of the light guide plate 4. A transparent adhesive is usually used to bring the light-shielding film 7 into close contact with the back surface of the light guide plate 4, but the adhesive is also included in the reflective paint 5 itself, so that the light guide plate 4 side passes through the through hole. Depending on the amount of the reflective paint extruded on the sheet, it is possible to adhere the reflective paint itself without using an adhesive. As described above, in the second embodiment, the shape (contour) of the portion to which the reflective coating material 5 is applied is generally more accurate than in the case of printing in the first embodiment.
【００１２】なお、第１、第２実施例とも、加圧、接着
に際して、上記のほか、真空パック方法を用いたり、両
面テープを用いたりしても差支えない。In both the first and second embodiments, in addition to the above, a vacuum packing method or a double-sided tape may be used for pressure and adhesion.
【００１３】[0013]
【発明の効果】以上説明したように本発明によれば、液
晶表示素子光源用導光装置で導光板内を導かれて導光板
の背面に到達してそこから外部に洩れ出て来た光を、導
光板を通過して液晶表示素子裏面方向へ反射させるため
に、反射塗料を光源からの距離に応じて適当に分布塗布
する作業が、極めて容易かつ正確にできるようになる。As described above, according to the present invention, the light guided in the light guide plate for the light source of the liquid crystal display device reaches the back surface of the light guide plate and leaks to the outside. Therefore, the work of applying the reflective coating material in an appropriate distribution in accordance with the distance from the light source can be performed very easily and accurately in order to reflect it toward the rear surface of the liquid crystal display element through the light guide plate.
【図１】図１（ａ）は本発明の第１実施例の側断面図、
図１（ｂ）は本発明の第２実施例の側断面図である。FIG. 1 (a) is a side sectional view of a first embodiment of the present invention,
FIG. 1 (b) is a side sectional view of the second embodiment of the present invention.
【図２】図２（ａ）は液晶表示素子背後の片側端部だけ
に光源を配置した従来例を、図２（ｂ）は液晶表示素子
背後の両側端部に光源を配置した従来例を示す側断面図
である。FIG. 2 (a) is a conventional example in which a light source is arranged only on one side end portion behind a liquid crystal display element, and FIG. 2 (b) is a conventional example in which a light source is arranged on both side end portions behind a liquid crystal display element. It is a sectional side view shown.
１…ランプ（冷陰極蛍光灯）、 ２…ランプ反射シー
ト、 ３…拡散シート、４…導光板、 ５…反射塗料、
６…反射シート、 ７…遮光フィルム。1 ... Lamp (cold cathode fluorescent lamp), 2 ... Lamp reflection sheet, 3 ... Diffusion sheet, 4 ... Light guide plate, 5 ... Reflective paint,
6 ... Reflective sheet, 7 ... Shading film.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高久 重剛 千葉県茂原市早野3673番地 日立日進エレ クトロニクス株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigego Takahisa 3673 Hayano, Mobara-shi, Chiba Hitachi Nisshin Electronics Co., Ltd.
Claims (2)
状光源からの光を、液晶表示素子の背後に配置した光透
過率が高い物質よりなる均等な厚みの導光板に入射さ
せ、光源から導光板に入射された光のうち板の背面に到
達して洩れ出た光を、導光板背面各部位でそれぞれ液晶
表示素子裏面方向へ、その部位が光源から遠くなるのに
従って、その部位での面積平均反射率が漸次高くなるよ
うに反射させる手段を設け、液晶表示素子裏面で一様な
照度が得られるようにした液晶表示素子光源用導光装置
において、前記反射させる手段は、高い反射率を有する
反射性塗料の所定値以上の厚さの層を、導光板背面に密
着させて、各部位それぞれで所期の反射率が得られるよ
うな面積比率に分布させることにより形成され、反射性
塗料層を導光板背面に密着分布させるために、導光板に
通常の方法で直接印刷せずに、導光板とは別の可撓性薄
膜に、予め反射性塗料を所期の反射率分布が得られるよ
うに印刷しておいたものを、その反射性塗料印刷面が導
光板の背面に密着するように透明な接着剤で接着させた
ことを特徴とする液晶表示素子光源用導光装置。1. Light from a rod-shaped light source disposed at a side end portion behind a liquid crystal display element is made incident on a light guide plate made of a substance having a high light transmittance disposed behind the liquid crystal display element and having a uniform thickness. Of the light that has entered the light guide plate from the light source, the light that has reached the back surface of the plate and leaked is directed toward the back surface of the liquid crystal display element at each part of the back surface of the light guide plate, and as the part becomes further away from the light source, In the light guide device for a liquid crystal display element light source, which is provided with a means for reflecting so that the area average reflectance in the region gradually increases, a uniform illuminance can be obtained on the back surface of the liquid crystal display element, the reflecting means is: It is formed by placing a layer of a reflective paint having a high reflectance and having a thickness equal to or more than a predetermined value on the back surface of the light guide plate, and distributing the area ratio so that the desired reflectance is obtained at each part. , The reflective paint layer on the back of the light guide plate Instead of directly printing on the light guide plate in order to obtain a close contact distribution, a flexible coating different from the light guide plate is printed beforehand with a reflective coating so that the desired reflectance distribution can be obtained. A light guide device for a light source of a liquid crystal display element, characterized in that the deposited material is adhered with a transparent adhesive so that the surface coated with the reflective paint is in close contact with the back surface of the light guide plate.
て、前記反射させる手段は、高い反射率を有する反射性
塗料の所定値以上の厚さの層を、導光板背面に密着また
は接近して、各部位それぞれで所期の反射率が得られる
ような面積比率に分布させることにより形成され、反射
性塗料層を導光板背面に密着または接近して分布させる
ために、印刷方法などによらず、装置の底板の内面全面
に反射性塗料を塗布したのち、この塗料が乾燥固化する
前に、各部位で所期の反射率が得られるように反射性塗
料を分布配置すべき位置に、予め貫通孔を穿設しておい
た遮光性薄膜を前記底板内面に圧着し、貫通孔位置以外
の個所に塗布されていた反射性塗料を貫通孔内に押し出
させて、前記底板の内面に反射性塗料が前記遮光性薄膜
を介して所期の分布密度で塗布されたものを形成させ、
その遮光性薄膜の表面が導光板背面に密着するように透
明な接着剤で接着させたことを特徴とする液晶表示素子
光源用導光装置。2. In the light guide device for a liquid crystal display element light source, the means for reflecting is obtained by closely contacting or approaching a back surface of a light guide plate with a layer of a reflective paint having a high reflectance and having a thickness of a predetermined value or more. , It is formed by distributing the area ratio so that the desired reflectance is obtained in each part, and the reflective paint layer is distributed close to or close to the back surface of the light guide plate, so that it does not depend on the printing method. After applying the reflective coating on the entire inner surface of the bottom plate of the device, before the coating dries and solidifies, the reflective coating should be distributed and arranged in advance so that the desired reflectance can be obtained at each part. A light-shielding thin film having a through hole is pressure-bonded to the inner surface of the bottom plate, and the reflective coating applied to the portion other than the position of the through hole is pushed out into the through hole, so that the inner surface of the bottom plate has a reflective property. Desired distribution of paint through the light-shielding thin film To form what is applied in degrees,
A light guide device for a liquid crystal display element light source, characterized in that the surface of the light-shielding thin film is adhered to the back surface of the light guide plate with a transparent adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6016112A JPH07225377A (en) | 1994-02-10 | 1994-02-10 | Light guide device for light source of liquid crystal display element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6016112A JPH07225377A (en) | 1994-02-10 | 1994-02-10 | Light guide device for light source of liquid crystal display element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07225377A true JPH07225377A (en) | 1995-08-22 |
Family
ID=11907439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6016112A Pending JPH07225377A (en) | 1994-02-10 | 1994-02-10 | Light guide device for light source of liquid crystal display element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07225377A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980021185A (en) * | 1996-09-13 | 1998-06-25 | 김광호 | Backlight of liquid crystal display |
| KR100475523B1 (en) * | 1997-07-30 | 2005-09-02 | 삼성전자주식회사 | Back-light assembly |
| JP2007504982A (en) * | 2003-09-08 | 2007-03-08 | コニンクリユケ フィリップス エレクトロニクス エヌ．ブイ． | Daylight luminescent panel |
| WO2012057750A1 (en) * | 2010-10-27 | 2012-05-03 | Hewlett-Packard Development Company, L.P. | Reflective color display with backlighting |
| CN104033770A (en) * | 2014-06-23 | 2014-09-10 | 王富强 | Even-intensity light guide strip |
| JP2017004978A (en) * | 2009-03-25 | 2017-01-05 | ピクサラックス イノベーションズ ピーティーワイ リミテッド | Illumination panel |
| CN106908988A (en) * | 2016-01-04 | 2017-06-30 | 宁波长阳科技股份有限公司 | A kind of backlight assembly of liquid crystal display |
| WO2019229905A1 (en) * | 2018-05-30 | 2019-12-05 | 堺ディスプレイプロダクト株式会社 | Light-guide plate unit, liquid crystal display device, and method for manufacturing light-guide plate unit |
-
1994
- 1994-02-10 JP JP6016112A patent/JPH07225377A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980021185A (en) * | 1996-09-13 | 1998-06-25 | 김광호 | Backlight of liquid crystal display |
| KR100475523B1 (en) * | 1997-07-30 | 2005-09-02 | 삼성전자주식회사 | Back-light assembly |
| JP2007504982A (en) * | 2003-09-08 | 2007-03-08 | コニンクリユケ フィリップス エレクトロニクス エヌ．ブイ． | Daylight luminescent panel |
| JP2017004978A (en) * | 2009-03-25 | 2017-01-05 | ピクサラックス イノベーションズ ピーティーワイ リミテッド | Illumination panel |
| WO2012057750A1 (en) * | 2010-10-27 | 2012-05-03 | Hewlett-Packard Development Company, L.P. | Reflective color display with backlighting |
| US9039266B2 (en) | 2010-10-27 | 2015-05-26 | Hewlett-Packard Development Company, L.P. | Reflective color display with backlighting |
| CN104033770A (en) * | 2014-06-23 | 2014-09-10 | 王富强 | Even-intensity light guide strip |
| CN106908988A (en) * | 2016-01-04 | 2017-06-30 | 宁波长阳科技股份有限公司 | A kind of backlight assembly of liquid crystal display |
| WO2019229905A1 (en) * | 2018-05-30 | 2019-12-05 | 堺ディスプレイプロダクト株式会社 | Light-guide plate unit, liquid crystal display device, and method for manufacturing light-guide plate unit |
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