JP2003131032A - Adhesive optical member and liquid crystal display - Google Patents
Adhesive optical member and liquid crystal displayInfo
- Publication number
- JP2003131032A JP2003131032A JP2001325005A JP2001325005A JP2003131032A JP 2003131032 A JP2003131032 A JP 2003131032A JP 2001325005 A JP2001325005 A JP 2001325005A JP 2001325005 A JP2001325005 A JP 2001325005A JP 2003131032 A JP2003131032 A JP 2003131032A
- Authority
- JP
- Japan
- Prior art keywords
- adhesive layer
- diffusion
- liquid crystal
- optical member
- light
- 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
Landscapes
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Laminated Bodies (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
(57)【要約】
【課題】 液晶セル表面のガラス板との耐久性の良好な
光拡散性の粘着層を有する粘着型光学部材を提供するこ
と。
【解決手段】 光学素子の少なくとも片面に、透明無着
色粒子を含有する光透過性の拡散粘着層（ａ）が、光透
過性の粘着層（ｂ）を介して設けられている粘着型光学
部材において、前記拡散粘着層（ａ）の引張り弾性率
（Ｅａ）と前記粘着層（ｂ）の引張り弾性率（Ｅｂ）の
比（Ｅａ）／（Ｅｂ）が１以上であることを特徴とする
粘着型光学部材。
(57) [Problem] To provide a pressure-sensitive adhesive optical member having a light-diffusing pressure-sensitive adhesive layer having good durability with a glass plate on the surface of a liquid crystal cell. SOLUTION: A light-transmitting diffusion pressure-sensitive adhesive layer (a) containing transparent non-colored particles is provided on at least one surface of an optical element via a light-transmitting pressure-sensitive adhesive layer (b). Wherein the ratio (Ea) / (Eb) of the tensile elastic modulus (Ea) of the diffusion adhesive layer (a) to the tensile elastic modulus (Eb) of the adhesive layer (b) is 1 or more. Mold optical member.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光学部材及び液晶
表示装置に関する。TECHNICAL FIELD The present invention relates to an optical member and a liquid crystal display device.
【０００２】[0002]
【従来の技術】従来より、液晶表示装置に用いられる光
学部材の粘着層としては、明るさの向上や視野角の向上
のため、屈折率が相違する粒子を含有させて光拡散性を
付与し、かつ液晶表示の視野角を拡大しうるようにした
光拡散型の粘着層が知られている。2. Description of the Related Art Conventionally, as an adhesive layer of an optical member used in a liquid crystal display device, in order to improve brightness and viewing angle, particles having different refractive indexes are contained to impart light diffusing property. In addition, a light diffusion type adhesive layer capable of expanding the viewing angle of a liquid crystal display is known.
【０００３】しかしながら、光拡散型の粘着層中には、
粒子が分散されているため、液晶セル表面のガラス板と
の接着性が経時的に低下する傾向があり、特に高温、高
湿条件下では発泡が生じたり、液晶セルと光学部材の接
着端部の界面で剥離が生じるなどの耐久性に問題があっ
た。However, in the light diffusion type adhesive layer,
Since the particles are dispersed, the adhesiveness between the liquid crystal cell surface and the glass plate tends to decrease with time, and foaming may occur especially under high temperature and high humidity conditions, or the adhesive end portion of the liquid crystal cell and the optical member. There was a problem in durability such as peeling occurring at the interface.
【０００４】また、光拡散型の粘着層は、信頼性に優れ
る接着処理性を満足させつつ、光拡散性を高めて視野角
の拡大をはかると後方散乱等の増大で透過率が減少し、
透過率を高めると拡散性が低下して光の透過率と拡散性
のバランスが悪いという問題点があった。Further, the light-diffusing pressure-sensitive adhesive layer, while satisfying the highly reliable adhesive processability, enhances the light-diffusing property and widens the viewing angle, so that the transmittance decreases due to an increase in backscattering, etc.
There has been a problem that if the transmittance is increased, the diffusivity is lowered and the balance between the light transmittance and the diffusivity is poor.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、液晶セル表
面のガラス板との耐久性の良好な光拡散性の粘着層を有
する粘着型光学部材を提供することを目的とする。ま
た、本発明は、信頼性に優れる接着処理性を満足させつ
つ、光の透過率と拡散性のバランスに優れ、明るさ、色
変化の少ない視認性に優れる液晶表示装置の形成などに
好適な光拡散性の粘着層を有する粘着型光学部材を提供
することを目的とする。さらには、前記粘着型光学部材
が液晶セルに設けられていることを特徴とする液晶表示
装置を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a pressure-sensitive adhesive optical member having a light-diffusing pressure-sensitive adhesive layer having good durability with a glass plate on the surface of a liquid crystal cell. Further, the present invention is suitable for forming a liquid crystal display device which has excellent balance of light transmittance and diffusivity while satisfying highly reliable adhesive processability, and has excellent visibility with little brightness and color change. An object of the present invention is to provide an adhesive optical member having a light diffusing adhesive layer. Furthermore, it is an object of the present invention to provide a liquid crystal display device characterized in that the adhesive optical member is provided in a liquid crystal cell.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、前記課題
を解決すべく鋭意検討を重ねた結果、以下に示す粘着型
光学部材により、上記目的を達成できることを見出し、
本発明を完成するに至った。As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the adhesive optical member shown below can achieve the above-mentioned object,
The present invention has been completed.
【０００７】すなわち本発明は、光学素子の少なくとも
片面に、透明無着色粒子を含有する光透過性の拡散粘着
層（ａ）が、光透過性の粘着層（ｂ）を介して設けられ
ている粘着型光学部材において、前記拡散粘着層（ａ）
の引張り弾性率（Ｅａ）と前記粘着層（ｂ）の引張り弾
性率（Ｅｂ）の比（Ｅａ）／（Ｅｂ）が１以上であるこ
とを特徴とする粘着型光学部材、に関する。That is, according to the present invention, a light-transmissive diffusion adhesive layer (a) containing transparent uncolored particles is provided on at least one surface of an optical element via a light-transmissive adhesive layer (b). In the adhesive optical member, the diffusion adhesive layer (a)
The adhesive optical member is characterized in that the ratio (Ea) / (Eb) of the tensile elastic modulus (Ea) of (1) to the tensile elastic modulus (Eb) of the adhesive layer (b) is 1 or more.
【０００８】上記本発明の粘着型光学部材では、光学素
子に、光透過性の粘着層（ｂ）を介して、透明無着色粒
子を含有する光透過性の拡散粘着層（ａ）を設け、しか
も拡散粘着層（ａ）の引張り弾性率（Ｅａ）と前記粘着
層（ｂ）の引張り弾性率（Ｅｂ）の比（Ｅａ）／（Ｅ
ｂ）が１以上となるものを用いることで、拡散粘着層
（ａ）の耐久性を向上させている。前記比（Ｅａ）／
（Ｅｂ）は、２以上とするのが好ましい。なお、前記比
（Ｅａ）／（Ｅｂ）が大きくなると、接着力の低下や耐
久性が悪くなる傾向があるため、前記比（Ｅａ）／（Ｅ
ｂ）は５０以下、さらには３０以下であるのが好まし
い。In the pressure-sensitive adhesive type optical member of the present invention, the optical element is provided with the light-transmissive diffusion pressure-sensitive adhesive layer (a) containing transparent uncolored particles through the light-transmissive pressure-sensitive adhesive layer (b). Moreover, the ratio (Ea) / (E of the tensile elastic modulus (Ea) of the diffusion adhesive layer (a) and the tensile elastic modulus (Eb) of the adhesive layer (b).
The durability of the diffusion adhesive layer (a) is improved by using a material in which b) is 1 or more. The ratio (Ea) /
(Eb) is preferably 2 or more. If the ratio (Ea) / (Eb) increases, the adhesive strength tends to decrease and the durability tends to deteriorate. Therefore, the ratio (Ea) / (E
b) is preferably 50 or less, more preferably 30 or less.
【０００９】また、拡散粘着層（ａ）の引張り弾性率
（Ｅａ）は０．０２〜２Ｎ／２ｍｍ2、好ましくは０．
０５〜１Ｎ／２ｍｍ2 であり、また粘着層（ｂ）の引張
り弾性率（Ｅｂ）は０．００５〜０．１Ｎ／２ｍｍ2 、
好ましくは０．０１〜０．０６Ｎ／２ｍｍ2 である。The tensile elastic modulus (Ea) of the diffusion adhesive layer (a) is 0.02 to 2 N / 2 mm 2 , preferably 0.
05-1 N / 2 mm 2 , and the adhesive layer (b) has a tensile elastic modulus (Eb) of 0.005-0.1 N / 2 mm 2 ,
It is preferably 0.01 to 0.06 N / 2 mm 2 .
【００１０】前記粘着型光学部材において、拡散粘着層
（ａ）が含有する透明無着色粒子が、平均粒子径をＤ
（ｎｍ）、入射光の波長λ（ｎｍ）としたとき、式：α
＝πＤ／λ（π：円周率）で表される散乱パラメーター
αが１〜１００であることが好ましい。In the pressure-sensitive adhesive optical member, the transparent uncolored particles contained in the diffusion pressure-sensitive adhesive layer (a) have an average particle diameter of D
(Nm) and the wavelength of incident light λ (nm), the formula: α
The scattering parameter α represented by = πD / λ (π: circular constant) is preferably 1 to 100.
【００１１】拡散粘着層（ａ）に含有させる透明無着色
粒子として、前記散乱パラメーターαを有するものを用
いることにより、光の透過率と拡散性のバランスに優
れ、明るさ、色変化の少ない視認性に優れる好適な光拡
散性の拡散粘着層（ａ）を形成できる。前記散乱パラメ
ーターαは５〜５０であるのがより好ましい。By using the transparent non-colored particles contained in the diffusion adhesive layer (a) having the above scattering parameter α, the light transmittance and the diffusivity are excellently balanced, and the brightness and the color change are small. A suitable light diffusing diffusion adhesive layer (a) having excellent properties can be formed. The scattering parameter α is more preferably 5 to 50.
【００１２】前記粘着型光学部材において、拡散粘着層
（ａ）の全光線透過率が８５％以上であることが好まし
い。In the pressure-sensitive adhesive type optical member, the total light transmittance of the diffusion pressure-sensitive adhesive layer (a) is preferably 85% or more.
【００１３】拡散粘着層（ａ）の全光線透過率が８５％
未満では後方散乱によるロスが多くなる傾向があり、全
光線透過率を８５％以上とするのが明るい表示をするう
えで好ましい。全光線透過率は、全光線透過率は８７％
以上、さらには９０％以上であるのがより好ましい。な
お、拡散粘着層（ａ）の光拡散率（ヘイズ値）は、用
途、目的に応じて調整され、２０〜９０％程度であるの
が好適である。The total light transmittance of the diffusion adhesive layer (a) is 85%.
If it is less than 100%, the loss due to backscattering tends to increase, and it is preferable to set the total light transmittance to 85% or more for bright display. The total light transmittance is 87%.
As described above, it is more preferably 90% or more. The light diffusion rate (haze value) of the diffusion pressure-sensitive adhesive layer (a) is adjusted according to the use and purpose, and is preferably about 20 to 90%.
【００１４】前記粘着型光学部材において、光学素子と
しては、偏光板および位相差板のいずれか少なくとも１
つを有するものを用いるのが好ましい。また本発明は、
前記粘着型光学部材が液晶セルに設けられていることを
特徴とする液晶表示装置、に関する。特に、本発明は、
光学素子として、偏光板と位相差板を有する積層体の位
相差板側（偏光板を積層していない側）に、前記拡散粘
着層（ａ）を形成した粘着型光学部材を用い、この拡散
粘着層（ａ）により粘着型光学部材が液晶セルに設けら
れた反射型液晶表示装置として有用である。かかる反射
型液晶表示装置は、拡散粘着層（ａ）が光拡散層を兼ね
ることで別個の光拡散板を配置する必要がなく、液晶表
示装置の部材を省略して薄型軽量化を達成することがで
きる。In the pressure-sensitive adhesive type optical member, the optical element is at least one of a polarizing plate and a retardation plate.
It is preferable to use the one having one. Further, the present invention is
The present invention relates to a liquid crystal display device, wherein the adhesive optical member is provided in a liquid crystal cell. In particular, the invention is
As an optical element, a pressure-sensitive adhesive optical member in which the diffusion pressure-sensitive adhesive layer (a) is formed on the retardation plate side (the side where the polarizing plate is not laminated) of the laminate having the polarizing plate and the retardation plate is used. The adhesive layer (a) is useful as a reflective liquid crystal display device in which an adhesive optical member is provided in a liquid crystal cell. In such a reflective liquid crystal display device, since the diffusion adhesive layer (a) also serves as the light diffusion layer, it is not necessary to dispose a separate light diffusion plate, and members of the liquid crystal display device can be omitted to achieve thinning and weight reduction. You can
【００１５】[0015]
【発明の実施の形態】以下に本発明の粘着型光学部材を
図面を参照しながら説明する。図１は、光学素子１の片
面に、透明無着色粒子３を含有する光透過性の拡散粘着
層２（ａ）が、光透過性の粘着層２（ｂ）を介して設け
られている粘着型光学部材の断面図である。前記拡散粘
着層２（ａ）にはセパレータ４が設けられていてもよ
い。図１では、光学素子１の片面に粘着層を形成した場
合を例示したが、粘着層は両面に形成されていてもよ
い。BEST MODE FOR CARRYING OUT THE INVENTION The adhesive optical member of the present invention will be described below with reference to the drawings. In FIG. 1, a light-transmissive diffusion adhesive layer 2 (a) containing transparent uncolored particles 3 is provided on one surface of an optical element 1 via a light-transmissive adhesive layer 2 (b). It is sectional drawing of a type | mold optical member. A separator 4 may be provided on the diffusion adhesive layer 2 (a). In FIG. 1, the case where the adhesive layer is formed on one surface of the optical element 1 is illustrated, but the adhesive layer may be formed on both surfaces.
【００１６】拡散粘着層２（ａ）に分散含有させる光透
過性の透明無着色粒子３としては、無色透明のものを適
宜に選択した用いうる。たとえば、シリカ、アルミナ、
チタニア、ジルコニア、酸化錫、酸化インジウム、酸化
カドミウム、酸化アンチモン等の導電性を有する無機系
粒子、架橋又は未架橋の各種ポリマー等からなる有機系
粒子などがあげられる。これら透明無着色粒子３は１種
を用いてもよく、２種以上を混合してもよい。As the transparent transparent non-colored particles 3 dispersedly contained in the diffusion adhesive layer 2 (a), colorless and transparent particles can be appropriately selected and used. For example, silica, alumina,
Examples thereof include inorganic particles having conductivity such as titania, zirconia, tin oxide, indium oxide, cadmium oxide, and antimony oxide, and organic particles composed of various crosslinked or uncrosslinked polymers. These transparent uncolored particles 3 may be used alone or in combination of two or more.
【００１７】透明無着色粒子３の平均粒子径は、光拡散
性の達成性と接着性の制御性などの点から、全光線にお
いて、前記散乱パラメーターαが１〜１００となるよう
なものが好ましい。前記透明無着色粒子３の平均粒子径
は０．５〜１０μｍ程度、さらには１〜９μｍ、特に２
〜８μｍのものが好ましい。The average particle size of the transparent uncolored particles 3 is preferably such that the scattering parameter α is 1 to 100 for all rays from the viewpoints of achieving light diffusibility and controlling adhesiveness. . The average particle size of the transparent uncolored particles 3 is about 0.5 to 10 μm, more preferably 1 to 9 μm, and especially 2
It is preferably ˜8 μm.
【００１８】拡散粘着層２（ａ）の粘着層形成材として
は、光透過性を示す粘着性物質を含有するものを特に制
限されず、各種のものを適宜に選択して用いることがで
きる。前記粘着性物質としては、たとえば、ゴム系粘着
剤、アクリル系粘着剤、シリコーン系粘着剤、ポリビニ
ルアルキルエーテル系粘着剤、ポリビニルアルコール系
粘着剤、ポリビニルピロリドン系粘着剤、ポリアクリル
アミド系粘着剤、セルロース系粘着剤などがあげられ
る。前記拡散粘着層２（ａ）を形成する粘着層形成材
は、光透過性に優れるものが好ましく、また耐候性等も
加味した場合、特にアクリル系粘着剤を好ましい。な
お、粘着層形成材中には、ベースポリマーの他に、必要
に応じて、架橋剤、粘着付与剤、可塑剤、充填剤、酸化
防止剤、紫外線吸収剤、シランカップリング剤等を、ま
た本発明の目的を逸脱しない範囲で各種の添加剤を適宜
に使用することもできる。The adhesive layer forming material of the diffusion adhesive layer 2 (a) is not particularly limited to a material containing an adhesive substance exhibiting light transmittance, and various materials can be appropriately selected and used. Examples of the adhesive substance include rubber adhesives, acrylic adhesives, silicone adhesives, polyvinyl alkyl ether adhesives, polyvinyl alcohol adhesives, polyvinylpyrrolidone adhesives, polyacrylamide adhesives, and cellulose. Examples include adhesives. The adhesive layer forming material forming the diffusion adhesive layer 2 (a) is preferably one having excellent light transmittance, and when weather resistance and the like are also taken into consideration, an acrylic adhesive is particularly preferable. In addition, in the adhesive layer forming material, in addition to the base polymer, if necessary, a crosslinking agent, a tackifier, a plasticizer, a filler, an antioxidant, an ultraviolet absorber, a silane coupling agent, and the like, Various additives may be appropriately used without departing from the object of the present invention.
【００１９】また、拡散粘着層２（ａ）を形成する粘着
層形成材と透明無着色粒子３は、後方散乱を抑制して透
過方向に良好な光拡散性をもたせることなどの点から、
透明無着色粒子３の屈折率をｎ1 、粘着層形成材の屈折
率をｎ２としたとき、式：０．０１＜｜ｎ１−ｎ２｜＜
０．１を満足するような組み合わせが好ましい、さら
に、｜ｎ１−ｎ２｜＜０．０９であるのが好ましい。特
に−０. ０８＜ｎ１−ｎ２＜−０．０１を満足する組合
せとしたものが好ましい。Further, the adhesive layer forming material forming the diffusion adhesive layer 2 (a) and the transparent non-colored particles 3 suppress backscattering and have good light diffusivity in the transmission direction.
When the refractive index of the transparent uncolored particles 3 is n1 and the refractive index of the adhesive layer forming material is n2, the formula: 0.01 <| n1-n2 | <
A combination that satisfies 0.1 is preferable, and it is more preferable that | n1−n2 | <0.09. In particular, a combination satisfying -0.08 <n1-n2 <-0.01 is preferable.
【００２０】拡散粘着層２（ａ）に分散含有させる透明
無着色粒子３の使用量は、前記光拡散率と、接着力を確
保できるように適宜に決定されるが、一般には、粘着層
形成材（固形分）１００重量部あたり、1 〜２００重量
部、さらには５〜１５０重量部、特に８〜1 ００重量部
を配合するのが好ましい。The amount of the transparent non-colored particles 3 to be dispersedly contained in the diffusion adhesive layer 2 (a) is appropriately determined so as to secure the light diffusivity and the adhesive force, but generally, the adhesive layer is formed. It is preferable to add 1 to 200 parts by weight, further 5 to 150 parts by weight, and especially 8 to 100 parts by weight per 100 parts by weight of the material (solid content).
【００２１】光透過性の粘着層２（ｂ）の粘着層形成材
としては、拡散粘着層２（ａ）に用いられるものと同様
のものを使用できる。好ましくは拡散粘着層２（ａ）に
用いられたものと同じ物である。たとえば拡散粘着層２
（ａ）にアクリル系粘着剤を用いた場合には、層間の粘
着層（ｂ）にもアクリル系粘着剤を用いるのが好まし
い。As the adhesive layer forming material for the light-transmissive adhesive layer 2 (b), the same materials as those used for the diffusion adhesive layer 2 (a) can be used. It is preferably the same as that used for the diffusion adhesive layer 2 (a). For example, the diffusion adhesive layer 2
When the acrylic pressure-sensitive adhesive is used for (a), it is preferable to use the acrylic pressure-sensitive adhesive for the interlayer pressure-sensitive adhesive layer (b).
【００２２】本発明の粘着型光学部材の作製は、たとえ
ば、光学素子１に、直接、粘着層２（ｂ）を形成し、さ
らに拡散粘着層２（ａ）を形成する方法、また、別途、
セパレータ４に拡散粘着層２（ａ）と粘着層２（ｂ）を
それぞれ形成した後、それらを光学素子１に図１になる
ように貼り合せ移着する方法、セパレータ４上に拡散粘
着層２（ａ）、粘着層２（ｂ）の順で多層形成したもの
を光学素子１に図１になるように貼り合せ移着する方法
等を採用することができる。拡散粘着層２（ａ）と粘着
層２（ｂ）の形成は、例えば各粘着層の形成材をカレン
ダーロール法等による圧延方式、ドクターブレード法や
グラビアロールコーター法等による塗工方式などの適宜
な方式で光学素子等またはセパレータに行う。The pressure-sensitive adhesive optical member of the present invention can be produced, for example, by directly forming the pressure-sensitive adhesive layer 2 (b) on the optical element 1 and then forming the diffusion pressure-sensitive adhesive layer 2 (a), or separately.
A method of forming the diffusion adhesive layer 2 (a) and the adhesive layer 2 (b) on the separator 4 and then bonding and transferring them to the optical element 1 as shown in FIG. 1, the diffusion adhesive layer 2 on the separator 4 It is possible to employ a method in which a multilayer structure in which (a) and the adhesive layer 2 (b) are formed in this order are bonded and transferred to the optical element 1 as shown in FIG. The diffusion adhesive layer 2 (a) and the adhesive layer 2 (b) may be formed, for example, by a method such as a rolling method using a material for forming each adhesive layer such as a calendar roll method or a coating method using a doctor blade method or a gravure roll coater method. Any method can be applied to the optical element or the separator.
【００２３】拡散粘着層２（ａ）の厚さは、目的とする
光拡散率や接着力などに応じて決定しうるが一般には３
００μｍ以下、さらには１〜２００μｍ、特に５〜１０
０μｍとするのが好適である。粘着層２（ｂ）の厚さ
は、目的とする耐久性などの点から、１００μｍ以下、
さらには１〜５０μｍ、特に２〜２０μｍとするのが好
適である。The thickness of the diffusion adhesive layer 2 (a) can be determined according to the desired light diffusivity, adhesive strength, etc., but is generally 3
00 μm or less, further 1 to 200 μm, especially 5 to 10
The thickness is preferably 0 μm. The thickness of the adhesive layer 2 (b) is 100 μm or less from the viewpoint of desired durability and the like.
Further, the thickness is preferably 1 to 50 μm, and particularly preferably 2 to 20 μm.
【００２４】セパレータ４は、必要に応じて設けられ
る。セパレータ４の構成材料としては、紙、ポリエチレ
ン、ポリプロピレン、ポリエチレンテレフタレート等の
合成樹脂フィルム等があげられる。セパレータ４の表面
には、拡散粘着層２（ａ）からの剥離性を高めるため、
必要に応じてシリコーン処理、長鎖アルキル処理、フッ
素処理等の離型処理が施されていても良い。セパレータ
４の厚みは、通常１０〜２００μｍ、好ましくは２５〜
１００μｍ程度である。The separator 4 is provided as needed. Examples of the constituent material of the separator 4 include paper, synthetic resin films such as polyethylene, polypropylene and polyethylene terephthalate. On the surface of the separator 4, in order to enhance the peelability from the diffusion adhesive layer 2 (a),
If necessary, mold release treatment such as silicone treatment, long-chain alkyl treatment, and fluorine treatment may be performed. The thickness of the separator 4 is usually 10 to 200 μm, preferably 25 to
It is about 100 μm.
【００２５】粘着型光学部材に用いる光学素子１は特に
制限されず、例えば液晶表示装置等の最終目的物を形成
する各光学素子を適宜に選択して用いることができる。
拡散粘着層２（ａ）等は、光学素子１の片面又は両面に
設けられるが、光学素子１は複数の光学素子の２層以上
の積層体であってもよい。光学素子を２層以上組合せる
場合その組み合わせについて特に制限はなく、また拡散
粘着層２（ａ）を設けた光学素子１に、さらに当該拡散
粘着層２（ａ）等を介して光学素子を積層することもで
きる。The optical element 1 used for the pressure-sensitive adhesive type optical member is not particularly limited, and for example, each optical element forming a final object such as a liquid crystal display device can be appropriately selected and used.
The diffusion adhesive layer 2 (a) and the like are provided on one side or both sides of the optical element 1, but the optical element 1 may be a laminate of two or more layers of a plurality of optical elements. When two or more optical elements are combined, the combination is not particularly limited, and the optical element 1 provided with the diffusion adhesive layer 2 (a) is further laminated with the optical element via the diffusion adhesive layer 2 (a) or the like. You can also do it.
【００２６】前記光学素子１としては、たとえば、偏光
板、位相差板、偏光板と位相差板との積層体からなる楕
円偏光板などがあげられる。光学素子１としては、偏光
板、位相差板等を好ましく用いられる。Examples of the optical element 1 include a polarizing plate, a retardation plate, and an elliptically polarizing plate composed of a laminate of the polarizing plate and the retardation plate. As the optical element 1, a polarizing plate, a retardation plate or the like is preferably used.
【００２７】偏光板としては従来より液晶表示装置に使
用されているものを特に制限なく用いることができる。
たとえば、ポリビニルアルコール系、部分ホルマール化
ポリビニルアルコール系、エチレン・酢酸ビニル共重合
体系部分ケン化物の如き親水性高分子のフィルムに、ヨ
ウ素及び／又は二色性染料を吸着させて延伸処理したも
の、ポリビニルアルコールの脱水処理物やポリ塩化ビニ
ルの脱塩酸処理物の如きポリエン配向フィルム等からな
る偏光フィルムなどがあげられる。偏光フィルムの厚さ
は通例５〜８０μｍであるが、これに限定されない。偏
光板は、偏光フィルムの片面又は両面を透明保護層等で
被覆したものであってもよい。かかる透明保護層等は、
偏光フィルムの補強や耐熱性の向上、偏光フィルムを湿
度等より保護することなどの種々の目的を有するもので
あってよい。透明保護層は、樹脂の塗布層や樹脂フィル
ムのラミネート層などとして形成することができる。As the polarizing plate, those conventionally used in liquid crystal display devices can be used without particular limitation.
For example, a film of hydrophilic polymer such as polyvinyl alcohol-based, partially formalized polyvinyl alcohol-based, ethylene / vinyl acetate copolymer-based partially saponified product, which is stretched by adsorbing iodine and / or dichroic dye, Examples thereof include a polarizing film formed of a polyene oriented film such as a dehydrated product of polyvinyl alcohol and a dehydrochlorinated product of polyvinyl chloride. The thickness of the polarizing film is usually 5 to 80 μm, but is not limited thereto. The polarizing plate may be a polarizing film whose one side or both sides are covered with a transparent protective layer or the like. Such a transparent protective layer,
It may have various purposes such as reinforcing the polarizing film, improving heat resistance, and protecting the polarizing film from humidity. The transparent protective layer can be formed as a resin coating layer, a resin film laminating layer, or the like.
【００２８】位相差板も従来より液晶表示装置に使用さ
れているものを特に制限なく用いることができ、１／４
波長板や１／２波長板、あるいはその他の位相差特性を
示す補償用位相差板などの位相差を示すものがあげられ
る。なお前記の補償用位相差板は、複屈折の波長依存性
などを補償して液晶表示装置の視認性の向上化などを目
的とするものである。また位相差板は、単層物や２層以
上の位相差層を重畳してなる複層物などの適宜な層形態
を有するものであってよい。As the retardation plate, one that has been conventionally used in liquid crystal display devices can be used without any particular limitation.
A wave plate, a half wave plate, or a compensating phase difference plate having other phase difference characteristics may be used. The above-mentioned retardation plate for compensation is intended to improve the visibility of the liquid crystal display device by compensating for the wavelength dependence of birefringence. Further, the retardation plate may have an appropriate layer form such as a single-layered product or a multi-layered product formed by superposing two or more retardation layers.
【００２９】位相差板は、例えばカーボネート系、エス
テル系、イミド系、エーテルスルホン系、スルホン系、
スチレン系、ビニルアルコール系、アリレート系、塩化
ビニル系、塩化ビニリデン系、アクリル系、アミド系、
エポキシ系、セルロース系、ポリエチレンやポリプロピ
レンの如きポリオレフィン系等のプラスチックの延伸フ
ィルム、液晶ポリマーの配向フィルムなどの材質のもの
があげられる。The retardation plate is, for example, carbonate type, ester type, imide type, ether sulfone type, sulfone type,
Styrene-based, vinyl alcohol-based, arylate-based, vinyl chloride-based, vinylidene chloride-based, acrylic-based, amide-based,
Examples include materials such as stretched films of plastics such as epoxy series, cellulose series, polyolefin series such as polyethylene and polypropylene, and oriented films of liquid crystal polymers.
【００３０】位相差板等の厚さは、目的とする位相差な
どに応じて適宜に決定しうるが、一般には柔軟性や薄型
化などの点より１〜５００μｍ、さらには５〜４００μ
ｍ、特に１０〜３００μｍとされる。また位相差板は、
例えば熱収縮性フィルムとの接着下に高分子フィルムを
延伸又は／及び収縮処理したフィルムの如く、厚さ方向
の屈折率を制御したものなどであってもよい。The thickness of the retardation plate or the like can be appropriately determined according to the intended retardation, etc., but generally it is 1 to 500 μm, and more preferably 5 to 400 μm from the viewpoint of flexibility and thinness.
m, particularly 10 to 300 μm. In addition, the phase difference plate,
For example, a film in which the refractive index in the thickness direction is controlled, such as a film obtained by stretching or / and shrinking a polymer film under adhesion with a heat-shrinkable film, may be used.
【００３１】なお、図２に示すように光学素子１が偏光
板１３と位相差板１１との積層体からなる楕円偏光板で
ある場合には、透過光の光学特性のバラツキを防止する
点などより拡散粘着層２（ａ）および粘着層２（ｂ）
は、位相差板１１側の外表面に設けることが好ましく、
偏光板１３と位相差板１１の積層は拡散性を示さない接
着層１２により行うことが好ましい。当該接着層１２の
形成には、粘着層２（ｂ）の形成材と同様のものが好適
に用いられる。When the optical element 1 is an elliptically polarizing plate composed of a laminate of a polarizing plate 13 and a retardation plate 11 as shown in FIG. 2, it is possible to prevent variations in optical characteristics of transmitted light. More diffusion adhesive layer 2 (a) and adhesive layer 2 (b)
Is preferably provided on the outer surface of the retardation plate 11 side,
The lamination of the polarizing plate 13 and the retardation plate 11 is preferably performed by the adhesive layer 12 having no diffusibility. For forming the adhesive layer 12, the same material as the forming material of the adhesive layer 2 (b) is preferably used.
【００３２】また前記偏光板には反射層を設けることが
できる。たとえば、金属箔、金属粉末をバインダで保持
した塗工層、その塗工層を支持基材上に設けてなる反射
板、金属の蒸着層やその蒸着層を支持基材上に設けてな
る反射層などがあげられる。かかる反射層は、上記した
偏光板と一体化されて反射型偏光板などとして形成され
ていてもよい。A reflective layer may be provided on the polarizing plate. For example, a metal foil, a coating layer in which a metal powder is held by a binder, a reflection plate having the coating layer provided on a supporting base material, a metal vapor deposition layer or a reflection layer having the vapor deposition layer provided on a supporting base material. Layers and the like. Such a reflective layer may be integrated with the above-mentioned polarizing plate to form a reflective polarizing plate or the like.
【００３３】前記偏光板には、偏光分離板を用いること
もできる。偏光分離板は、たとえば、誘電体の薄膜を重
畳した多層膜を介してブリュースター角により自然光を
直線偏光からなる反射光と透過光に分離するようにした
ものや、複屈折性誘電体の薄膜を重畳した多層膜を介し
て自然光を直線偏光からなる反射光と透過光に分離する
ようにしたもの、あるいはコレステリック液晶層やそれ
を反射特性の異なる組合せで重畳して自然光を左右の円
偏光からなる反射光と透過光に分離するようにしたもの
などがあげられる。A polarization separation plate may be used as the polarizing plate. The polarization separation plate is, for example, one that separates natural light into reflected light and transmitted light composed of linearly polarized light by Brewster's angle through a multilayer film in which thin films of dielectrics are superposed, or a thin film of birefringent dielectric. Natural light is separated into reflected light and transmitted light consisting of linearly polarized light through a multilayer film that superimposes, or natural light is converted from left and right circularly polarized light by superimposing cholesteric liquid crystal layers and combinations with different reflection characteristics. It is possible to separate the reflected light and the transmitted light.
【００３４】上記粘着型光学部材は、液晶セルに設けら
れて液晶表示装置を形成する。液晶セルは、従来より知
られているものを特に制限なく用いることできる。たと
えば、ツイストネマチック液晶やスーパーツイストネマ
チック液晶を用いた液晶セル、非ツイスト系の液晶や二
色性染料を液晶中に分散させたゲストホスト系の液晶、
あるいは強誘電性液晶を用いた液晶セルなどがあげら
れ、その駆動方式も適宜なものであってよい。The adhesive optical member is provided in a liquid crystal cell to form a liquid crystal display device. A conventionally known liquid crystal cell can be used without particular limitation. For example, a liquid crystal cell using twisted nematic liquid crystal or super twisted nematic liquid crystal, a non-twisted liquid crystal or a guest-host liquid crystal in which a dichroic dye is dispersed in the liquid crystal,
Alternatively, a liquid crystal cell using a ferroelectric liquid crystal or the like can be given, and its driving method may be appropriate.
【００３５】液晶表示装置は、反射型や透過型、あるい
は反射・透過両用型の液晶表示装置などの各種装置の形
成に好ましく用いうる。液晶装置等の形成に際しては本
発明による拡散粘着層以外の拡散層を配置することもで
きる。また、液晶表示装置の形成に際しては、導光板、
バックライト、アンチグレア板、プリズムシート、レン
ズシート等の光路制御板を適宜に配置することもでき
る。これらは光学素子に設けられていてもよい。The liquid crystal display device can be preferably used for forming various devices such as a reflective type, a transmissive type, and a reflective / transmissive type liquid crystal display device. When forming a liquid crystal device or the like, a diffusion layer other than the diffusion adhesive layer according to the present invention may be arranged. When forming a liquid crystal display device, a light guide plate,
An optical path control plate such as a backlight, an anti-glare plate, a prism sheet or a lens sheet may be appropriately arranged. These may be provided in the optical element.
【００３６】反射型液晶表示装置を形成する場合、本発
明の粘着型光学部材は、液晶セルの視認側に配置するこ
とが好ましく、特に本発明による拡散粘着層２（ａ）が
液晶セルと偏光板の間に位置して隣接する光学層（位相
差板）を接着した構造として配置されていることが好ま
しい。In the case of forming a reflective liquid crystal display device, the adhesive optical member of the present invention is preferably disposed on the viewing side of the liquid crystal cell, and in particular, the diffusion adhesive layer 2 (a) of the present invention is polarized with the liquid crystal cell. It is preferable that they are arranged as a structure in which adjacent optical layers (retarders) located between the plates are adhered.
【００３７】[0037]
【実施例】以下に、実施例等によって本発明を具体的に
説明するが、本発明はこれら実施例によって何等限定さ
れるものではない。なお、各例の物性は下記方法により
測定した値である。EXAMPLES The present invention will be specifically described below with reference to examples and the like, but the present invention is not limited to these examples. The physical properties of each example are values measured by the following methods.
【００３８】（引張り弾性率）各粘着層について、サン
プル（断面積２ｍｍ2 ）をチャック間距離１０ｍｍ、引
張り速度３００ｍｍ／ｍｉｎ、２３℃の測定温度により
測定して得られたＳ−Ｓ曲線の初期の立ち上がりに接線
を引き、その傾きから算出したものである。(Tensile Elastic Modulus) For each adhesive layer, a sample (cross-sectional area 2 mm 2 ) was measured at a chuck distance of 10 mm, a pulling speed of 300 mm / min, and a measurement temperature of 23 ° C. It is calculated by drawing a tangent line to the rising edge of, and calculating its slope.
【００３９】（散乱パラメーターα）透明無着色粒子の
平均粒子径をＤ（ｎｍ）、入射光の波長λ（ｎｍ）とし
たとき、α＝πＤ／λ（π：円周率）で定義される値で
ある。(Scattering parameter α) When the average particle diameter of transparent uncolored particles is D (nm) and the wavelength of incident light is λ (nm), it is defined by α = πD / λ (π: circular constant). It is a value.
【００４０】（全光線透過率，ヘイズ）ＪＩＳ Ｋ７１
０５によりヘイズメータを用いて測定した値である。(Total light transmittance, haze) JIS K71
It is the value measured using a haze meter according to 05.
【００４１】実施例１
屈折率（ｎ１）が１．４３、平均粒子径が４μｍのシリ
カ系の透明無着色粒子３３重量部を、屈折率（ｎ２）が
１．４７のアクリル系粘着剤（ブチルアクリレート／ア
クリル酸＝１００／５（重量比）の共重合体をベースポ
リマーとするもの）１００重量部（固形分）に混合して
拡散粘着層（ａ）の形成材を調製した。これを、セパレ
ータ上に塗工することにより、厚さ２５μｍの拡散粘着
層（ａ）を形成した。この透明無着色粒子の散乱パラメ
ーター（λ：５６０ｎｍ）は約２２であった。この拡散
粘着層（ａ）を、上記アクリル系粘着剤により、２０μ
ｍの粘着層（ｂ）を形成した位相差板（ポリカーボネー
トフィルム，厚さ８０μｍ）に、当該粘着層（ｂ）を介
して積層して、粘着型光学部材を作製した。Example 1 33 parts by weight of silica-based transparent uncolored particles having a refractive index (n1) of 1.43 and an average particle diameter of 4 μm were mixed with an acrylic adhesive (butyl) having a refractive index (n2) of 1.47. A diffusion adhesive layer (a) forming material was prepared by mixing 100 parts by weight (solid content) of a copolymer having acrylate / acrylic acid = 100/5 (weight ratio) as a base polymer. This was applied onto a separator to form a diffusion adhesive layer (a) having a thickness of 25 μm. The scattering parameter (λ: 560 nm) of the transparent uncolored particles was about 22. This diffusion adhesive layer (a) was coated with
An adhesive optical member was produced by laminating the adhesive layer (b) on a retardation plate (polycarbonate film, thickness 80 μm) having the adhesive layer (b) formed thereon.
【００４２】拡散粘着層（ａ）の引張り弾性率（Ｅａ）
は０．５Ｎ／２ｍｍ2 、前記粘着層（ｂ）の引張り弾性
率（Ｅｂ）０．０４Ｎ／２ｍｍ2 、比（Ｅａ）／（Ｅ
ｂ）＝１２．５であった。拡散粘着層（ａ）の全光線透
過率は９１．０％、光拡散率（ヘイズ）は８２．３％で
あった。Tensile elastic modulus (Ea) of the diffusion adhesive layer (a)
Is 0.5 N / 2 mm 2 , the tensile elastic modulus (Eb) of the adhesive layer (b) is 0.04 N / 2 mm 2 , and the ratio (Ea) / (E
b) = 12.5. The total light transmittance of the diffusion adhesive layer (a) was 91.0%, and the light diffusivity (haze) was 82.3%.
【００４３】実施例２
屈折率（ｎ１）が１．６３、平均粒子径が３μｍのＡｌ
2 Ｏ3 の透明無着色粒子１０重量部を、屈折率（ｎ２）
が１．４７のアクリル系粘着剤（ブチルアクリレート／
アクリル酸＝１００／５（重量比）の共重合体をベース
ポリマーとするもの）１００重量部（固形分）に混合し
て拡散粘着層（ａ）の形成材を調製した。これを、セパ
レータ上に塗工することにより、厚さ２５μｍの拡散粘
着層（ａ）を形成した。この透明無着色粒子の散乱パラ
メーター（λ：５６０ｎｍ）は約１７であった。この拡
散粘着層（ａ）を、上記アクリル系粘着剤により、２０
μｍの粘着層（ｂ）を形成した位相差板（ポリカーボネ
ートフィルム，厚さ８０μｍ）に、当該粘着層（ｂ）を
介して積層して、粘着型光学部材を作製した。Example 2 Al having a refractive index (n1) of 1.63 and an average particle size of 3 μm
10 parts by weight of transparent uncolored particles of 2 O 3 have a refractive index (n2)
Acrylic adhesive with 1.47 (butyl acrylate /
A material for forming the diffusion adhesive layer (a) was prepared by mixing 100 parts by weight (solid content) of a copolymer having acrylic acid = 100/5 (weight ratio) as a base polymer. This was applied onto a separator to form a diffusion adhesive layer (a) having a thickness of 25 μm. The scattering parameter (λ: 560 nm) of this transparent uncolored particle was about 17. This diffusion adhesive layer (a) is coated with the above acrylic adhesive 20
A pressure-sensitive adhesive optical member was manufactured by laminating the pressure-sensitive adhesive layer (b) on a retardation plate (polycarbonate film, thickness 80 μm) having the pressure-sensitive adhesive layer (b) formed therebetween.
【００４４】拡散粘着層（ａ）の引張り弾性率（Ｅａ）
は０．６Ｎ／２ｍｍ2 、前記粘着層（ｂ）の引張り弾性
率（Ｅｂ）は０．０４Ｎ／２ｍｍ2 、比（Ｅａ）／（Ｅ
ｂ）＝１５であった。拡散粘着層（ａ）の全光線透過率
は８５％、光拡散率（ヘイズ）は８４％であった。Tensile elastic modulus (Ea) of the diffusion adhesive layer (a)
Is 0.6 N / 2 mm 2 , the tensile modulus (Eb) of the adhesive layer (b) is 0.04 N / 2 mm 2 , and the ratio (Ea) / (E
b) = 15. The total light transmittance of the diffusion adhesive layer (a) was 85%, and the light diffusivity (haze) was 84%.
【００４５】比較例１
実施例１において、粘着層（ｂ）を形成していない位相
差板に拡散粘着層（ａ）を積層したこと以外は、実施例
１と同様にして粘着型光学部材を作製した。Comparative Example 1 An adhesive optical member was prepared in the same manner as in Example 1 except that the diffusion adhesive layer (a) was laminated on the retardation plate on which the adhesive layer (b) was not formed. It was made.
【００４６】（耐久性）実施例及び比較例で得た粘着型
光学部材（位相差板）の拡散粘着層（ａ）および粘着層
（ｂ）を設けていない面に、図２に示すように、上記ア
クリル系粘着剤により粘着層を形成したヨウ素系偏光板
（厚さ２１０μｍ）を積層して粘着型光学部材（楕円偏
光板）を作製した。これらについて、それぞれを清浄な
ガラス板に、拡散粘着層（ａ）を介して接着した後、５
０℃、５気圧の条件にてオートクレーブ処理を３０分間
行った。さらに、それぞれのサンプルを８０℃−６５％
ＲＨと６０℃−９０％ＲＨの条件のオーブンに２４時間
入れた後の状態を観察した。結果を表１に示す。なお、
実施例２では後方散乱が大きく光学特性は不十分であっ
た。(Durability) As shown in FIG. 2, the surfaces of the pressure-sensitive adhesive type optical members (retarders) obtained in Examples and Comparative Examples, on which the diffusion pressure-sensitive adhesive layer (a) and the pressure-sensitive adhesive layer (b) were not provided, were measured. Then, an iodine-based polarizing plate (thickness: 210 μm) having a pressure-sensitive adhesive layer formed by the acrylic pressure-sensitive adhesive was laminated to prepare a pressure-sensitive adhesive type optical member (elliptical polarizing plate). Each of these was adhered to a clean glass plate via the diffusion adhesive layer (a), and then 5
Autoclave treatment was carried out for 30 minutes under conditions of 0 ° C. and 5 atm. Furthermore, each sample is 80 ℃ -65%
The state after being placed in an oven under the conditions of RH and 60 ° C.-90% RH for 24 hours was observed. The results are shown in Table 1. In addition,
In Example 2, the backscattering was large and the optical characteristics were insufficient.
【００４７】[0047]
【表１】 [Table 1]
【図１】本発明の粘着型光学部材の断面図の一例であ
る。FIG. 1 is an example of a cross-sectional view of an adhesive optical member of the present invention.
【図２】本発明の粘着型光学部材の断面図の一例であ
る。FIG. 2 is an example of a cross-sectional view of the adhesive optical member of the present invention.
【符号の説明】 １ 光学素子 ２（ａ） 拡散粘着層（ａ） ２（ｂ） 粘着層（ｂ） ３ 透明無着色粒子 ４ セパレータ[Explanation of symbols] 1 Optical element 2 (a) Diffusion adhesive layer (a) 2 (b) Adhesive layer (b) 3 Transparent uncolored particles 4 separator
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０２Ｆ 1/13363 Ｇ０２Ｆ 1/13363 Ｆターム(参考） 2H042 BA02 BA12 BA20 2H049 BA02 BA06 BA27 BA42 BB42 BB43 BB51 BB54 BB63 BC22 2H091 FA08X FA08Z FA11X FA11Z FA31X FA31Z FB02 FB11 FC12 FD15 GA01 GA17 HA07 HA08 HA10 HA12 LA01 LA13 LA19 4F100 AA20 AK25G AK45 BA03 BA07 BA10A BA10B DE01B GB41 JK07B JK07C JL00 JL13B JL13C JN00A JN01B JN01C JN10A JN30B YY00B YY00C ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) G02F 1/13363 G02F 1/13363 F term (reference) 2H042 BA02 BA12 BA20 2H049 BA02 BA06 BA27 BA42 BB42 BB43 BB51 BB54 BB63 BB63 BC22 2H091 FA08X FA08Z FA11X FA11Z FA31X FA31Z FB02 FB11 FC12 FD15 GA01 GA17 HA07 HA08 HA10 HA12 LA01 LA13 LA19 4F100 AA20 AK25G AK45 BA03 BA07 BA10A BA10B DE01B GB41JK00B JK07C JL01BJN00JL13
Claims (5)
色粒子を含有する光透過性の拡散粘着層（ａ）が、光透
過性の粘着層（ｂ）を介して設けられている粘着型光学
部材において、前記拡散粘着層（ａ）の引張り弾性率
（Ｅａ）と前記粘着層（ｂ）の引張り弾性率（Ｅｂ）の
比（Ｅａ）／（Ｅｂ）が１以上であることを特徴とする
粘着型光学部材。1. An adhesive optical system in which a light-transmissive diffusion adhesive layer (a) containing transparent uncolored particles is provided on at least one surface of an optical element via a light-transmissive adhesive layer (b). In the member, the ratio (Ea) / (Eb) of the tensile elastic modulus (Ea) of the diffusion adhesive layer (a) and the tensile elastic modulus (Eb) of the adhesive layer (b) is 1 or more. Adhesive optical member.
粒子が、平均粒子径をＤ（ｎｍ）、入射光の波長λ（ｎ
ｍ）としたとき、式：α＝πＤ／λ（π：円周率）で表
される散乱パラメーターαが１〜１００であることを特
徴とする請求項１記載の粘着型光学部材。2. The transparent uncolored particles contained in the diffusion adhesive layer (a) have an average particle diameter of D (nm) and a wavelength of incident light of λ (n
m), the adhesive optical member according to claim 1, wherein the scattering parameter α represented by the formula: α = πD / λ (π: circular constant) is 1 to 100.
％以上であることを特徴とする請求項１または２記載の
粘着型光学部材。3. The total light transmittance of the diffusion adhesive layer (a) is 85.
% Or more, The pressure-sensitive adhesive optical member according to claim 1 or 2, wherein
ずれか少なくとも１つを有することを特徴とする請求項
１〜３のいずれかに記載の粘着型光学部材。4. The pressure-sensitive adhesive optical member according to claim 1, wherein the optical element has at least one of a polarizing plate and a retardation plate.
光学部材が液晶セルに設けられていることを特徴とする
液晶表示装置。5. A liquid crystal display device, wherein the pressure-sensitive adhesive type optical member according to claim 1 is provided in a liquid crystal cell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001325005A JP3908934B2 (en) | 2001-10-23 | 2001-10-23 | Adhesive optical member and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001325005A JP3908934B2 (en) | 2001-10-23 | 2001-10-23 | Adhesive optical member and liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003131032A true JP2003131032A (en) | 2003-05-08 |
| JP3908934B2 JP3908934B2 (en) | 2007-04-25 |
Family
ID=19141641
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001325005A Expired - Lifetime JP3908934B2 (en) | 2001-10-23 | 2001-10-23 | Adhesive optical member and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3908934B2 (en) |
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