JP2001166295A - Lamp reflector for back light of liquid crystal display device - Google Patents

Lamp reflector for back light of liquid crystal display device

Info

Publication number
JP2001166295A
JP2001166295A JP34554999A JP34554999A JP2001166295A JP 2001166295 A JP2001166295 A JP 2001166295A JP 34554999 A JP34554999 A JP 34554999A JP 34554999 A JP34554999 A JP 34554999A JP 2001166295 A JP2001166295 A JP 2001166295A
Authority
JP
Japan
Prior art keywords
liquid crystal
crystal display
lamp reflector
white
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
Application number
JP34554999A
Other languages
Japanese (ja)
Inventor
Yukio Takamizawa
幸夫 高見澤
Makoto Nishino
誠 西野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
COSMO TEC KK
Cosmotec KK
Original Assignee
COSMO TEC KK
Cosmotec KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by COSMO TEC KK, Cosmotec KK filed Critical COSMO TEC KK
Priority to JP34554999A priority Critical patent/JP2001166295A/en
Publication of JP2001166295A publication Critical patent/JP2001166295A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To prevent color changes or deterioration of a white reflection film as the raw material for a lamp reflector caused by heat or UV rays generated from a lamp, and to provide a lamp reflector at a low cost for the back light of a liquid crystal display device so as to prevent decrease in the luminance of the liquid crystal display with time. SOLUTION: A transparent resin layer containing a UV absorbent is formed on the reflection face side of a white reflection film. It is preferable to use a resin material containing a UV absorbent as chemically reacted with the resin as the transparent resin containing a UV absorbent from the viewpoint of solubility and absorptivity of UV rays. The resin material is, for example, an acrylic copolymer of acrylate monomers having a UV absorbing structure such as 2-hydroxybenzophenone and 2-hydroxyphenylbenzotriazole structure with other acrylic monomers. The obtained lamp reflector is assembled in a liquid crystal display device with the transparent resin layer containing the UV absorbent facing the lamp.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、改良された液晶表
示装置バックライト用ランプリフレクターに関し、その
素材である白色反射フィルムの変色や劣化を防止し、長
期の使用によってもその輝度が低下することが実質的に
無く、従って、液晶ディスプレイの輝度を低下させるこ
とも実質的に無い液晶表示装置バックライト用ランプリ
フレクターに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved lamp reflector for a backlight of a liquid crystal display device, which prevents discoloration and deterioration of a white reflective film, which is a material of the lamp reflector, and whose luminance is reduced even after long-term use. The present invention relates to a lamp reflector for a backlight of a liquid crystal display device, which does not substantially reduce the brightness of a liquid crystal display.

【0002】[0002]

【従来の技術】従来、例えば、直下型やサイドライト型
バックライトを用いる液晶表示装置において、発泡によ
って微細セルを形成した白色PET(ポリエチレンテレ
フタレート)フィルムや白色顔料をPP(ポリプロピレ
ン)等のポリオレフィン樹脂に練り込んで延伸させて微
細溝を形成した白色フィルム等の白色反射フィルムがラ
ンプリフレクターとして用いられているが、例え紫外線
吸収剤をこの様なフィルムに含有させても、直下型やサ
イドライト型のランプ(冷陰極管)から発生する熱や紫
外線の影響のために、長期の使用により上記白色反射フ
ィルムが変色(黄変)や劣化を受け、液晶ディスプレイ
の輝度が低下すると言う問題がある。
2. Description of the Related Art Conventionally, for example, in a liquid crystal display device using a direct type or sidelight type backlight, a white PET (polyethylene terephthalate) film in which fine cells are formed by foaming or a white pigment is a polyolefin resin such as PP (polypropylene). White reflective films such as white films in which fine grooves are formed by kneading and stretching are used as lamp reflectors, but even if an ultraviolet absorber is contained in such a film, a direct type or sidelight type There is a problem that the white reflective film undergoes discoloration (yellowing) or deterioration due to long-term use due to the influence of heat or ultraviolet rays generated from the lamp (cold cathode tube), and the brightness of the liquid crystal display decreases.

【0003】この問題を解決するため、例えば、厚み2
5μm程度の紫外線吸収剤含有耐候性フィルムを上記の
様な白色反射フィルムの表面に貼り合わせて耐候性(耐
熱性や耐紫外線性)を付与し、ランプリフレクターとし
て用いる方法があり、この方法の効果も認められてい
る。
[0003] In order to solve this problem, for example, the thickness 2
There is a method in which a weather resistant film containing an ultraviolet absorber of about 5 μm is attached to the surface of the white reflective film as described above to impart weather resistance (heat resistance or ultraviolet resistance) and used as a lamp reflector. Has also been recognized.

【0004】[0004]

【発明が解決しようとする課題】しかし、上記方法で
は、異種のフィルム材料を貼り合せるため、材料に歪み
が生じ、得られるランプリフレクターが湾曲してしまう
問題やコスト高となる問題がある。
However, in the above-mentioned method, since different kinds of film materials are bonded, there is a problem that the material is distorted, and the obtained lamp reflector is curved and the cost is high.

【0005】本発明は、このような従来技術の問題を解
決し、また、液晶表示装置の液晶ディスプレイの輝度の
経時的な低下を実質的に防止することができる液晶表示
装置バックライト用ランプリフレクターを提供すること
を目的とする。
[0005] The present invention solves the above-mentioned problems of the prior art, and can substantially prevent the luminance of the liquid crystal display of the liquid crystal display device from decreasing over time. The purpose is to provide.

【0006】[0006]

【課題を解決するための手段】本発明は、白色反射フィ
ルムのランプリフレクターとしての反射面側に該白色反
射フィルムの変色や劣化を防止する為の紫外線吸収剤含
有透明樹脂層を設けたことを特徴とする液晶表示装置バ
ックライト用ランプリフレクターを提供するものであ
る。
According to the present invention, a transparent resin layer containing an ultraviolet absorbent for preventing discoloration and deterioration of the white reflection film is provided on the reflection surface side of the white reflection film as a lamp reflector. An object of the present invention is to provide a lamp reflector for a liquid crystal display device backlight.

【0007】このような構成とすることにより、上記紫
外線吸収剤含有透明樹脂層が耐候性層として機能し、直
下型やサイドライト型のランプから発生する熱や紫外線
を相当の程度遮断するので、上記白色反射フィルムの変
色(黄変)や劣化を効果的に防止し、得られるランプリ
フレクターの輝度が長期の使用でも低下することを実質
的に防ぎ、延いては液晶ディスプレイの輝度の低下も実
質的に無くすことができる。また、紫外線吸収剤含有透
明樹脂層の樹脂の種類や厚みなどを適正に選べば、得ら
れるランプリフレクターの湾曲も実質的に無い。
[0007] With this configuration, the ultraviolet absorbent-containing transparent resin layer functions as a weather-resistant layer, and blocks a considerable amount of heat and ultraviolet light generated from a direct-type or sidelight-type lamp. Effectively prevents discoloration (yellowing) and deterioration of the white reflective film, and substantially prevents the luminance of the obtained lamp reflector from being reduced even after long-term use, and thus substantially reduces the luminance of the liquid crystal display. Can be eliminated. Moreover, if the kind and thickness of the resin of the transparent resin layer containing the ultraviolet absorbent are properly selected, the resulting lamp reflector has substantially no curvature.

【0008】[0008]

【発明の実施の形態】以下、本発明の好ましい実施の形
態を説明するが、本発明がこれらに限定されるもので無
いことは言うまでもない。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below, but it goes without saying that the present invention is not limited to these embodiments.

【0009】その反射面上に紫外線吸収剤含有透明樹脂
層を設ける上記白色反射フィルムとしては、例えば、液
晶表示装置バックライト用白色反射シートとして常用さ
れている発泡によって微細セルを形成させた白色PET
フィルムやPP等のポリオレフィン樹脂に白色顔料を練
り込んで延伸させて微細溝を形成したポリオレフィン系
白色フィルム等を好ましく用いることができるが、これ
らに限定されるものではない。例えば、白色顔料含有コ
ーティング層を設けたPETフィルム等や、PET以外
のポリエステル系樹脂などを用い発泡によって微細セル
を形成させた白色フィルムや、上記のポリオレフィン樹
脂の代りにPETやポリブチレンテレフタレート(PB
T)の如き樹脂などを用い上記と同様に微細溝を形成し
た白色フィルムなども用いることができる。なお、これ
らのフィルム材料には後に列挙する様な低分子紫外線吸
収剤を含ませても良い。
As the white reflective film having a transparent resin layer containing an ultraviolet absorbent on its reflective surface, for example, white PET formed with fine cells by foaming, which is commonly used as a white reflective sheet for a backlight of a liquid crystal display device.
A polyolefin-based white film in which fine grooves are formed by kneading and stretching a white pigment in a film or a polyolefin resin such as PP can be preferably used, but is not limited thereto. For example, a PET film or the like provided with a white pigment-containing coating layer, a white film in which fine cells are formed by foaming using a polyester resin other than PET, or PET or polybutylene terephthalate (PB) instead of the above polyolefin resin
A white film in which fine grooves are formed in the same manner as described above using a resin or the like as in T) can also be used. Incidentally, these film materials may contain a low molecular ultraviolet absorber as described later.

【0010】紫外線吸収剤含有透明樹脂層を形成するの
に用い得る樹脂としては、例えば、アクリル系樹脂、ポ
リエステル系樹脂、エチレン−酢酸ビニール共重合体な
どを挙げることができる。耐候性に優れたアクリル系樹
脂が特に好ましい。発泡によって微細セルを形成させた
白色PETフィルムや白色顔料を練り込んで延伸させて
微細溝を形成したポリオレフィン系白色フィルムなどの
場合は、表面に微細な凹凸や微細溝が存在するため、こ
れがアンカーとして作用し、密着性を確保できるので、
紫外線吸収剤含有透明樹脂層形成用の樹脂の種類を広範
な範囲から選ぶことができる。白色顔料含有コーティン
グ層を設けたPETフィルム等の場合は、コーティング
層との密着性を考慮して紫外線吸収剤含有透明樹脂層用
の樹脂を選べばよい。
Examples of the resin that can be used to form the transparent resin layer containing an ultraviolet absorber include acrylic resins, polyester resins, and ethylene-vinyl acetate copolymers. An acrylic resin having excellent weather resistance is particularly preferred. In the case of a white PET film in which fine cells are formed by foaming or a polyolefin white film in which fine grooves are formed by kneading and stretching a white pigment, fine irregularities and fine grooves are present on the surface. Acting as a
The kind of the resin for forming the ultraviolet absorbent-containing transparent resin layer can be selected from a wide range. In the case of a PET film or the like having a white pigment-containing coating layer, a resin for the ultraviolet absorbent-containing transparent resin layer may be selected in consideration of the adhesion to the coating layer.

【0011】紫外線吸収剤含有透明樹脂層に用い得る低
分子紫外線吸収剤としては、例えば、2−(5−メチル
ー2−ヒドロキシフェニル)ベンゾトリアゾール、2−
[2−ヒドロキシ−3,5−ビス(α,α−ジメチルベ
ンジル)フェニル]−2H−ベンゾトリアゾール、2−
(3,5−ジ−t−ブチル−2−ヒドロキシフェニル)
ベンゾトリアゾール、2−(3−t−ブチル−5−メチ
ル−2−ヒドロキシフェニル)−5−クロロベンゾトリ
アゾール、2−(3,5−ジ−t−ブチル−2−ヒドロ
キシフェニル)−5−クロロベンゾトリアゾール、2−
(3,5−ジ−t−アミル−2−ヒドロキシフェニル)
ベンゾトリアゾール、2−(2’−ヒドロキシ−5’−
t−オクチルフェニル)ベンゾトリアゾール、その他の
ヒドロキシフェニルベンゾトリアゾール誘導体、メチル
−3−[3−t−ブチル−5−(2H−ベンゾトリアゾ
ール−2−イル)−4−ヒドロキシフェニル]プロピオ
ネート−ポリオキシエチレングリコール(分子量:約3
00)縮合物等のベンゾトリアゾール系紫外線吸収剤、
2−(4,6−ジフェニル−1,3,5−トリアジン−
2−イル)−5−[(ヘキシル)オキシ]−フェノール
等のトリアジン系紫外線吸収剤、2−エトキシ−2’−
エチル蓚酸ビスアニリド等の蓚酸アニリド系紫外線吸収
剤、ベンゾフェノン、2−ヒドロキシ−4−n−オクチ
ルオキシベンゾフェノン等のベンゾフェノン系紫外線吸
収剤などを挙げることができる。紫外線吸収剤含有透明
樹脂層形成用の樹脂との相溶性や耐ブリード性などを考
慮して適当な紫外線吸収剤を選べば良い。
Examples of the low-molecular ultraviolet absorber which can be used in the ultraviolet absorbent-containing transparent resin layer include 2- (5-methyl-2-hydroxyphenyl) benzotriazole and 2- (5-methyl-2-hydroxyphenyl) benzotriazole.
[2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2-
(3,5-di-t-butyl-2-hydroxyphenyl)
Benzotriazole, 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chloro Benzotriazole, 2-
(3,5-di-t-amyl-2-hydroxyphenyl)
Benzotriazole, 2- (2'-hydroxy-5'-
t-octylphenyl) benzotriazole, other hydroxyphenylbenzotriazole derivatives, methyl-3- [3-t-butyl-5- (2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionate-polyoxyethylene Glycol (molecular weight: about 3
00) benzotriazole ultraviolet absorbers such as condensates,
2- (4,6-diphenyl-1,3,5-triazine-
Triazine-based ultraviolet absorbers such as 2-yl) -5-[(hexyl) oxy] -phenol, 2-ethoxy-2'-
Examples thereof include oxalic acid anilide ultraviolet absorbers such as ethyl oxalic acid bisanilide, and benzophenone ultraviolet absorbers such as benzophenone and 2-hydroxy-4-n-octyloxybenzophenone. An appropriate ultraviolet absorber may be selected in consideration of compatibility with the resin for forming the ultraviolet absorbent-containing transparent resin layer and bleed resistance.

【0012】上記の様な低分子紫外線吸収剤の樹脂との
相溶性の問題や経時的にブリードアウトする様な問題を
回避したり、耐熱性を向上させたりするには、紫外線吸
収剤が樹脂と化学反応した形で樹脂に含まれている樹脂
材料を紫外線吸収剤含有透明樹脂層形成用の樹脂の少な
くとも一部として用いるのが特に好ましく、この場合は
紫外線吸収剤含有透明樹脂層の紫外線吸収能も更に向上
し、白色反射フィルムの変色や劣化をより強力に防止す
ることができる。かかる樹脂材料としては、例えば、紫
外線吸収剤(紫外線吸収骨格)としての2−ヒドロキシ
ベンゾフェノン骨格及び/又は2−ヒドロキシフェニル
ベンゾトリアゾール骨格などを側鎖に有するアクリル系
樹脂化合物を挙げることができる。より具体的には、こ
の様なアクリル系樹脂化合物は、例えば、上記の如き紫
外線吸収骨格を有する(メタ)アクリル酸エステルモノ
マーと(メタ)アクリル酸や(メタ)アクリル酸(変
性)アルキルエステル等のアクリル系モノマーとを共重
合させたアクリル系共重合体などを代表例として挙げる
ことができる。なお、かかるアクリル系樹脂化合物は、
必要に応じてイソシアネート化合物等の架橋剤と併用し
ても良い。
In order to avoid the above-mentioned problems of compatibility of the low-molecular ultraviolet absorber with the resin and the problem of bleeding out with time, and to improve the heat resistance, the ultraviolet absorber must be made of a resin. It is particularly preferable to use the resin material contained in the resin in the form of a chemical reaction with at least a part of the resin for forming the ultraviolet absorbent-containing transparent resin layer, in which case the ultraviolet absorbent of the ultraviolet absorbent-containing transparent resin layer is used. The performance is further improved, and discoloration and deterioration of the white reflective film can be more strongly prevented. Examples of such a resin material include acrylic resin compounds having a 2-hydroxybenzophenone skeleton and / or 2-hydroxyphenylbenzotriazole skeleton as an ultraviolet absorber (ultraviolet absorption skeleton) in a side chain. More specifically, such an acrylic resin compound is, for example, a (meth) acrylic acid ester monomer having an ultraviolet absorbing skeleton as described above and (meth) acrylic acid or (meth) acrylic acid (modified) alkyl ester, etc. An acrylic copolymer obtained by copolymerizing the above-mentioned acrylic monomer and the like can be cited as a typical example. Incidentally, such an acrylic resin compound,
If necessary, it may be used in combination with a crosslinking agent such as an isocyanate compound.

【0013】上記の白色反射フィルムの片面(反射面)
に紫外線吸収剤含有透明樹脂層を直接印刷又はコーティ
ングにより形成する。上記紫外線吸収剤含有透明樹脂層
の厚みは、本発明の目的を少なくとも所望の程度達成で
きる限り特に限定されず、例えば、0.5〜20μmで
あるのが好ましく、1〜10μmであるのがより好まし
く、1〜5μmであるのが特に好ましい。
One side (reflection surface) of the above white reflection film
A transparent resin layer containing an ultraviolet absorber is formed by direct printing or coating. The thickness of the ultraviolet absorbent-containing transparent resin layer is not particularly limited as long as the object of the present invention can be achieved at least to a desired degree, and is, for example, preferably 0.5 to 20 μm, more preferably 1 to 10 μm. It is particularly preferably 1 to 5 μm.

【0014】使用する紫外線吸収剤含有樹脂は適当な溶
剤に溶解し、グラビアコーティング、ロールコーティン
グ、スクリーンべた刷りコーティング等の方法、好まし
くはグラビアコーティング法により、白色反射フィルム
の上にコーティングし、加熱乾燥することにより紫外線
吸収剤含有樹脂層を形成する。
The ultraviolet absorbent-containing resin to be used is dissolved in a suitable solvent, coated on a white reflective film by a method such as gravure coating, roll coating, or screen solid printing coating, preferably a gravure coating method, and dried by heating. By doing so, an ultraviolet absorbent-containing resin layer is formed.

【0015】この様にして得られたランプリフレクター
シートを適当な寸法に裁断し、直下型バックライトで
は、複数のランプの下にランプに沿う様にランプリフレ
クターを配置して用い、サイドライト型バックライトで
は、ランプを囲う様にほぼ半円状又はコの字型に折り曲
げて配置して用いる。
The lamp reflector sheet thus obtained is cut into an appropriate size, and in a direct type backlight, a lamp reflector is arranged under a plurality of lamps along the lamps and used. In the case of a light, the lamp is used by being bent in a substantially semicircular or U-shape so as to surround the lamp.

【0016】[0016]

【実施例】以下、本発明の液晶表示装置バックライト用
ランプリフレクターの一例の概念断面図である「図1」
を参照しつつ、本発明を実施例によって更に具体的に説
明するが、本発明は実施例に限定されるものではない。
また、図1の各層の厚みの比等は実際のものを表す訳で
はなく、単なる概念を表すものである。
FIG. 1 is a conceptual sectional view of an example of a lamp reflector for a backlight of a liquid crystal display device according to the present invention.
The present invention will be described more specifically with reference to Examples, but the present invention is not limited to Examples.
Further, the ratio of the thickness of each layer in FIG. 1 does not represent an actual thing, but merely represents a concept.

【0017】実施例1 白色反射フィルム1として厚み188μmの発泡白色P
ETフィルムE−60L(東レ株式会社製)を用い、そ
の片面上にアクリル系樹脂とベンゾフェノンをトルエン
とメチルエチルケトンの混合溶剤に溶解して調製した溶
液(樹脂固形分:約30重量%、ベンゾフェノン:約1
重量%)をグラビアコーティングし、加熱乾燥して、厚
み約4μmの紫外線吸収剤含有透明樹脂層2を形成し
た。
Example 1 Foamed white P having a thickness of 188 μm as the white reflective film 1
Using ET film E-60L (manufactured by Toray Industries, Inc.), a solution prepared by dissolving an acrylic resin and benzophenone in a mixed solvent of toluene and methyl ethyl ketone on one surface (resin solid content: about 30% by weight, benzophenone: about 1
% By weight) and dried by heating to form an ultraviolet absorbent-containing transparent resin layer 2 having a thickness of about 4 μm.

【0018】また、白色反射フィルム1として厚み18
0μmの白色顔料混練り・延伸微細溝形成白色PPフィ
ルム(三井化学株式会社製)を用い、その片面上に2−
ヒドロキシベンゾフェノン骨格を側鎖に有するアクリル
系樹脂化合物をトルエンとメチルエチルケトンの混合溶
剤に溶解して調製した溶液(樹脂固形分:約30重量
%)をグラビアコーティングし、加熱乾燥して、厚み約
4μmの紫外線吸収剤含有透明樹脂層2を形成した。
The white reflective film 1 has a thickness of 18
A 0-μm white pigment kneaded and stretched fine groove-formed white PP film (manufactured by Mitsui Chemicals, Inc.)
A solution prepared by dissolving an acrylic resin compound having a hydroxybenzophenone skeleton in a side chain in a mixed solvent of toluene and methyl ethyl ketone (resin solid content: about 30% by weight) is gravure coated, dried by heating, and dried to a thickness of about 4 μm. An ultraviolet absorbent-containing transparent resin layer 2 was formed.

【0019】この様にして得られた本発明のそれぞれの
ランプリフレクターシートを適当なサイズに裁断し、紫
外線吸収剤含有透明樹脂層2の表面を紫外線ランプに当
接する様にして、紫外線ランプを最長16時間まで点灯
し、変色(黄変)や劣化の挙動について促進試験した
が、いずれも変化は無かった。紫外線ランプとしては、
主波長365nmの紫外線を発する約50mWのランプ
を用い、その際の紫外線吸収剤含有透明樹脂層2の表面
温度は約100℃とした。
Each of the lamp reflector sheets of the present invention thus obtained is cut into an appropriate size, and the surface of the ultraviolet absorbent-containing transparent resin layer 2 is brought into contact with the ultraviolet lamp, so that the ultraviolet lamp is extended to the longest. The lamp was turned on for up to 16 hours, and accelerated tests were conducted for discoloration (yellowing) and deterioration behavior, but no change was found in any case. As an ultraviolet lamp,
A lamp of about 50 mW that emits ultraviolet light having a main wavelength of 365 nm was used, and the surface temperature of the ultraviolet absorbent-containing transparent resin layer 2 at that time was about 100 ° C.

【0020】比較例1 紫外線吸収剤含有透明樹脂層を設けない未処理の上記白
色PETフィルムE−60Lと未処理の上記白色顔料混
練り・延伸微細溝形成白色PPフィルムについても実施
例1と同様に促進試験したが、前者は8時間後に黄変が
観察され、後者は12時間後に表面荒れが観察され、1
6時間後には劣化が激しく崩壊してボロボロの状態とな
った。更に、他社ランプリフレクター製品A、Bについ
ても実施例1と同様に促進試験したが、他社ランプリフ
レクター製品Aは12時間の紫外線照射で黄変が観察さ
れ、他社ランプリフレクター製品Bは4時間の紫外線照
射で黄変が観察された。
Comparative Example 1 The untreated white PET film E-60L having no ultraviolet absorbent-containing transparent resin layer and the untreated white pigment kneaded / stretched white PP film having fine grooves formed therein were the same as in Example 1. In the accelerated test, yellowing was observed in the former after 8 hours, surface roughness was observed in the latter after 12 hours, and
After 6 hours, the deterioration was so severe that it collapsed and became tattered. Further, an accelerated test was performed on other company's lamp reflector products A and B in the same manner as in Example 1. However, yellowing was observed in the other company's lamp reflector product A after 12 hours of irradiation with ultraviolet light, and the other company's lamp reflector product B showed 4 hours of ultraviolet light. Yellowing was observed on irradiation.

【0021】[0021]

【発明の効果】本発明によれば、白色反射フィルムの片
面(反射面)上に、紫外線吸収剤含有透明樹脂層を設け
るという簡単な工程により、ランプリフレクターを可及
的に低コストで製作し、直下型やサイドライト型のラン
プの照射による白色反射フィルムの変色や劣化を防止で
き、液晶表示装置の液晶ディスプレイの輝度を低下させ
ることも実質的に無い液晶表示装置バックライト用ラン
プリフレクターを提供することができる。本発明のラン
プリフレクターを直下型バックライト液晶表示装置やサ
イドライト型バックライト液晶表示装置に組み込んで用
いると、長期間に渡り液晶ディスプレイの輝度の低下が
実質的に無いという利点がある。
According to the present invention, a lamp reflector can be manufactured at the lowest possible cost by a simple process of providing a transparent resin layer containing an ultraviolet absorber on one surface (reflection surface) of a white reflective film. To provide a lamp reflector for a backlight of a liquid crystal display device, which can prevent discoloration and deterioration of a white reflective film due to irradiation of a direct type or a sidelight type lamp, and does not substantially reduce the brightness of a liquid crystal display of the liquid crystal display device. can do. When the lamp reflector of the present invention is used by being incorporated in a direct type backlight liquid crystal display device or a sidelight type backlight liquid crystal display device, there is an advantage that the brightness of the liquid crystal display is not substantially reduced for a long period of time.

【図面の簡単な説明】[Brief description of the drawings]

【図1】図1は、本発明の液晶表示装置バックライト用
ランプリフレクターの一例の概念断面図である。
FIG. 1 is a conceptual sectional view of an example of a lamp reflector for a backlight of a liquid crystal display device of the present invention.

【符号の説明】[Explanation of symbols]

1 白色反射フィルム 2 紫外線吸収剤含有透明樹脂層 Reference Signs List 1 white reflective film 2 transparent resin layer containing ultraviolet absorber

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 白色反射フィルムのランプリフレクター
としての反射面側に該白色反射フィルムの変色や劣化を
防止する為の紫外線吸収剤含有透明樹脂層を設けたこと
を特徴とする液晶表示装置バックライト用ランプリフレ
クター。
1. A backlight for a liquid crystal display device, comprising a transparent resin layer containing an ultraviolet absorber for preventing discoloration and deterioration of the white reflective film on the reflective surface side of the white reflective film as a lamp reflector. For lamp reflector.
【請求項2】 前記白色反射フィルムが、発泡によって
微細セルを形成した白色反射フィルム又は白色顔料を練
り込んで延伸させて微細溝を形成した白色反射フィルム
であることを特徴とする請求項1に記載の液晶表示装置
バックライト用ランプリフレクター。
2. The white reflection film according to claim 1, wherein the white reflection film is a white reflection film in which fine cells are formed by foaming or a white reflection film in which fine grooves are formed by kneading and stretching a white pigment. The lamp reflector for the backlight of the liquid crystal display device according to the above.
【請求項3】 前記紫外線吸収剤が樹脂と化学反応した
形で樹脂に含まれていることを特徴とする請求項1又は
2に記載の液晶表示装置バックライト用ランプリフレク
ター。
3. The lamp reflector for a backlight of a liquid crystal display device according to claim 1, wherein the ultraviolet absorber is contained in the resin in a form chemically reacted with the resin.
JP34554999A 1999-12-03 1999-12-03 Lamp reflector for back light of liquid crystal display device Pending JP2001166295A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34554999A JP2001166295A (en) 1999-12-03 1999-12-03 Lamp reflector for back light of liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34554999A JP2001166295A (en) 1999-12-03 1999-12-03 Lamp reflector for back light of liquid crystal display device

Publications (1)

Publication Number Publication Date
JP2001166295A true JP2001166295A (en) 2001-06-22

Family

ID=18377355

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34554999A Pending JP2001166295A (en) 1999-12-03 1999-12-03 Lamp reflector for back light of liquid crystal display device

Country Status (1)

Country Link
JP (1) JP2001166295A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003100127A (en) * 2001-09-20 2003-04-04 Keiwa Inc Reflecting sheet and back light unit using the sheet
US6906761B2 (en) 2001-09-19 2005-06-14 Keiwa Inc. Reflection sheet and backlight unit using the same
US6929377B2 (en) 2001-11-16 2005-08-16 Kimoto Co., Ltd. Light-reflective material and light source device using the same
US6943855B2 (en) 2001-05-08 2005-09-13 Keiwa Inc. Reflection sheet and backlight unit using the same
WO2006118066A1 (en) * 2005-04-28 2006-11-09 Sharp Kabushiki Kaisha Electronic device
US7212257B2 (en) 2001-01-31 2007-05-01 International Business Machines Corporation Liquid crystal display device, side backlight unit, lamp reflector and reflection member
WO2007148544A1 (en) 2006-06-23 2007-12-27 Toray Industries, Inc. White reflection film
WO2008053739A1 (en) 2006-10-27 2008-05-08 Toray Industries, Inc. White polyester film for light reflective plate
JPWO2008139861A1 (en) * 2007-05-08 2010-07-29 東レ株式会社 White reflective film
US8067082B2 (en) 2004-11-12 2011-11-29 Toray Industries, Inc. White film and backlight using same
KR20160137992A (en) 2014-03-27 2016-12-02 도레이 카부시키가이샤 Laminated film
US9817160B2 (en) 2010-02-24 2017-11-14 Toray Industries, Inc. White reflective film for edge-lit backlight and backlight using the same

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7212257B2 (en) 2001-01-31 2007-05-01 International Business Machines Corporation Liquid crystal display device, side backlight unit, lamp reflector and reflection member
US6943855B2 (en) 2001-05-08 2005-09-13 Keiwa Inc. Reflection sheet and backlight unit using the same
US6906761B2 (en) 2001-09-19 2005-06-14 Keiwa Inc. Reflection sheet and backlight unit using the same
KR100523204B1 (en) * 2001-09-20 2005-10-24 케이와 인코포레이티드 Reflection sheet and backlight unit using the same
JP2003100127A (en) * 2001-09-20 2003-04-04 Keiwa Inc Reflecting sheet and back light unit using the sheet
US6929377B2 (en) 2001-11-16 2005-08-16 Kimoto Co., Ltd. Light-reflective material and light source device using the same
US8557370B2 (en) 2004-11-12 2013-10-15 Toray Industries, Inc. White film and backlight using same
EP3584612A1 (en) 2004-11-12 2019-12-25 Toray Industries, Inc. White film and backlight using same
US8067082B2 (en) 2004-11-12 2011-11-29 Toray Industries, Inc. White film and backlight using same
US8085256B2 (en) 2005-04-28 2011-12-27 Sharp Kabushiki Kaisha Electronic device
WO2006118066A1 (en) * 2005-04-28 2006-11-09 Sharp Kabushiki Kaisha Electronic device
US9046638B2 (en) 2006-06-23 2015-06-02 Toray Industries, Inc. White reflection film
EP2447602A1 (en) 2006-06-23 2012-05-02 Toray Industries, Inc. White reflection film
WO2007148544A1 (en) 2006-06-23 2007-12-27 Toray Industries, Inc. White reflection film
US8227073B2 (en) 2006-10-27 2012-07-24 Toray Industries, Inc. White polyester film for light reflective plate
WO2008053739A1 (en) 2006-10-27 2008-05-08 Toray Industries, Inc. White polyester film for light reflective plate
US8300172B2 (en) 2007-05-08 2012-10-30 Toray Industries, Inc. White reflective film
JPWO2008139861A1 (en) * 2007-05-08 2010-07-29 東レ株式会社 White reflective film
US9817160B2 (en) 2010-02-24 2017-11-14 Toray Industries, Inc. White reflective film for edge-lit backlight and backlight using the same
KR20160137992A (en) 2014-03-27 2016-12-02 도레이 카부시키가이샤 Laminated film

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