201245366 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種感壓膠、具有感壓膠的偏光板及 液晶顯示器，特別是指一種具有雙層結構的感壓膠、具有 雙層結構之感壓膠的偏光板，及液晶顯示器。 【先前技術】 參閱圖1 ’圖1是液晶顯示器的結構簡視示意圖，包含 4 一液晶顯示單元11、一偏光單元12，及一背光源13。該液 晶顯示單元11具有一第一基板111、一與該第一基板1U 成一間隔設置的第二基板112,及一夾設在該第一、二基板 111、112間的液晶分子113，其中，該第一基板} i即為業 界一般通稱的薄膜電晶體（TFT)側基板，該第二基板12即為 彩色濾光片（color filter，CF)側基板；該偏光單元12具有兩 片分別貼附在該第一、二基板111、112遠離該液晶分子 113之表面的偏光板121，及一介於該二片偏光板121與該 第一、一基板111、112間，作為貼合介質的感壓膠122, 該貪光源13位於該液晶顯不早元11下方，當施加電壓於該 第一、一基板11、12間的液晶分子13時，即可以改變該液 晶分子13配向狀態’控制來自於該背光源n的穿透性， 而將電子信號影像化。 該每一片偏光板121具有兩層由三聚醋酸纖維素構成 的保護膜，及一層夾設在該二層保護膜間，由吸附碘離子 延伸後的聚乙稀醇構成的偏光膜，且該每一片偏光板121 與該第一、二基板111、112之間則是利用含有壓克力樹脂 201245366 的感壓膠122作為貼合的介質彼此貼合。然而，由於液晶 顯示器於長期趨動下會產生約55〜65°C的熱，會使得該些偏 光板121與該第一、二基板U1、112於貼合過程產生的殘 存應力釋放，導致偏光板121收縮變形；或是偏光板121 之保護膜因受熱產生熱收縮，但是，因為感壓膠122並不 會因為受熱產生熱收縮，因此會與受到熱收縮之偏光板121 之間相互拉扯，造成偏光板丨21變形，而產生液晶顯示器 暗癌漏光的問題。 而為解決前述液晶顯示器因偏光板121受熱產生熱收 縮’所造成的暗態漏光問題，美國專利第US20080033 109 公開號揭示一種可改善暗態漏光的偏光板用感壓膠組成， 包含（A)丙稀酸共聚物、（b)〇.〇i〜〇·3重量份的交聯劑、 (C)0.01〜〇_5重量份的矽烷耦合劑，其中該丙烯酸共聚物（Α) 包含（al)10〜79.9wt%的甲基丙烯酸酯、（a2)2〇〜8〇wt%的含苯 %化合物、（a3)0.1〜l〇wt%的含官能基化合物，該化合物的 苯環含量不低於l〇wt%’且分子量不低於8〇〇,000〜2000000 ’此外’更進一步介定由該感壓膠組成製得的感壓膠，在201245366 VI. Description of the Invention: [Technical Field] The present invention relates to a pressure sensitive adhesive, a polarizing plate with a pressure sensitive adhesive, and a liquid crystal display, and more particularly to a pressure sensitive adhesive having a two-layer structure and having a double layer The structure of the pressure sensitive adhesive polarizing plate, and liquid crystal display. [Prior Art] Referring to Fig. 1 is a schematic view showing the structure of a liquid crystal display, comprising a liquid crystal display unit 11, a polarizing unit 12, and a backlight 13. The liquid crystal display unit 11 has a first substrate 111, a second substrate 112 spaced apart from the first substrate 1U, and a liquid crystal molecule 113 interposed between the first and second substrates 111 and 112. The first substrate}i is a thin film transistor (TFT) side substrate generally known in the industry, and the second substrate 12 is a color filter (CF) side substrate; the polarizing unit 12 has two sheets respectively attached a polarizing plate 121 attached to the surface of the first and second substrates 111 and 112 away from the liquid crystal molecules 113, and a feeling between the two polarizing plates 121 and the first and first substrates 111 and 112 as a bonding medium The glue 122 is located below the liquid crystal display element 11. When a voltage is applied to the liquid crystal molecules 13 between the first substrate and the substrate 11, the alignment state of the liquid crystal molecules 13 can be changed. The transmittance of the backlight n is used to visualize the electronic signal. Each of the polarizing plates 121 has two protective films made of cellulose triacetate, and a polarizing film which is sandwiched between the two protective films and is made of polyethylene glycol which is extended by adsorbing iodide ions, and Each of the polarizing plates 121 and the first and second substrates 111 and 112 are bonded to each other by using the pressure sensitive adhesive 122 containing acrylic resin 201245366 as a bonding medium. However, since the liquid crystal display generates heat of about 55 to 65 ° C under long-term driving, the residual stress generated by the polarizing plate 121 and the first and second substrates U1 and 112 during the bonding process is released, resulting in polarized light. The plate 121 is contracted and deformed; or the protective film of the polarizing plate 121 is thermally contracted by heat, but since the pressure sensitive adhesive 122 does not thermally shrink due to heat, it is pulled between the heat-shrinkable polarizing plate 121 and the heat-shrinkable polarizing plate 121. The polarizing plate 丨 21 is deformed, which causes a problem of dark cancer light leakage of the liquid crystal display. In order to solve the problem of the dark state light leakage caused by the heat shrinkage of the liquid crystal display due to the heat of the polarizing plate 121, the US Patent No. US20080033 109 discloses a composition of a pressure sensitive adhesive for a polarizing plate which can improve dark light leakage, including (A) Acrylic acid copolymer, (b) 〇.〇i~〇·3 parts by weight of a crosslinking agent, (C) 0.01 to 〇5 parts by weight of a decane coupling agent, wherein the acrylic copolymer (Α) contains (al 10 to 79.9 wt% of methacrylate, (a2) 2 〇 to 8 〇 wt% of a benzene-containing compound, (a3) 0.1 to 1% by weight of a functional group-containing compound, and the benzene ring content of the compound is not Less than l〇wt%' and the molecular weight is not less than 8〇〇000~2000000 'further' further defines the pressure sensitive adhesive made of the pressure sensitive adhesive,
23 C 的彈性模數（eiastic modulus)不大於 lxl〇5pa，在 80°C 的彈性模數不大於5xl〇4Pa。 此外，美國專利第US20060223938公開號則揭示另一 種偏光板用之感壓膠，該感壓膠是將感壓膠組成利用照光 後形成，該感壓膠組成包含丙烯酸共聚物，及支鏈上 具有光可聚合官能基之丙烯酸共聚物，且該感壓膠在23它 的彈性模數介於0.3〜lOMPa，在80°C的黏彈性不大於 201245366 5xl04Pa。 由上述說明可知目前大都是以改變感壓膠i22的組成 、黏彈性、交聯劑或添加劑等，藉由提升感壓膠122的黏 彈性來改善偏光板121因熱收縮所造成的液晶顯示器暗態 漏光問題，然而，此類感壓膠122組成的改變雖然可改善 ^光板121因受熱造成的液晶顯示器暗態大面積漏光問題 ，但疋對在持續高溫下約6小時後因偏光板121熱收縮而 每成的液晶顯不器邊緣約3〜5mm的暗態邊緣窄亮漏光問題 並無法有效改善。 【發明内容】 因此本發明之目的，即在提供一種用於連接液晶顯 示單元與偏光板之感壓膠。 此外，本發明之另一目的，即在提供一種具有感壓膠 的偏光板。 又本發明之再一目的，即在提供一種可以改善液晶 邊緣窄亮漏光問題的液晶顯示器。 於是，本發明一種用於連接液晶顯示單元與偏光板的 感壓膠，包含： 一第一膠膜在25°C的黏性率介於66000〜160000Pa，彈 性率介於126000〜180000Pa。 一第二膠膜在25°C的黏性率介於48000〜66000Pa，彈 性率介於180000〜260000Pa。 此外’本發明一種具有感壓膠的偏光板，包含二片保 D蒦犋、一夾設在該二片保護膜間的偏光膜，及貼附在其中 201245366 任>1保護膜上的感壓膠，該感壓膠依序具有一與該保 膜黏接的第-膠膜、及一與該第一膠膜黏接的第二膠膜： 該第-膠膜的組成份包括丙稀酸系樹脂，纟坑的毒占性率 介於6_(M6()_Pa，且彈性率介於126麵〜刪啊， 該第二膠膜的組成份包括丙烯酸系樹脂，纟饥第二膠膜 的黏丨生率介於48000〜66〇〇〇pa ，且彈性率介於 180000〜260000Pa。 又，本發明一種液晶顯示器，包含一液晶顯示單元、 ，及一偏光單元。該偏光單元具有一貼合於該液晶顯示單 元的偏光板，與一介於該液晶顯示單元與該偏光板間用為 貼合介質的感壓膠，該感壓膠具有一第一膠膜與一第二膠 膜，该第一膠膜與該偏光板表面黏接，其組成份包括丙烯 酸系樹月曰’在25C的黏性率介於66000〜160000Pa，且彈性 率介於126000〜180000Pa，該第二膠膜的組成份包括丙烯酸 系樹脂’且在25°C第二膠膜的黏性率介於48000〜66000Pa ，彈性率介於180000〜260000Pa。 本發明之功效在於：利用形成具有第一、二膠膜之雙 層結構的感壓膠’並分別控制該第一、二膠膜之間的黏、 彈性率差，不僅可解決液晶顯示器因受熱造成的暗態大面 積漏光問題’且可同時改善其暗態邊緣窄亮漏光問題。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 201245366 參閱圖2、圖3，本發明一種液晶顯示器的較佳實施例 ，包含一液晶顯示單元2,及一偏光單元3。 該液晶顯示單元2具有一第一基板21、一與該第一基 板21成一間隔設置的第二基板22、一夾設在該第一、二基 板21、22間的液晶分子23，及一位於該液晶顯示單元2下 方的背光源24。其中，該第一基板21即為業界一般通稱的 薄膜電晶體（TFT)側基板，該第二基板22即為彩色濾光片 (color filter，CF)側基板，當施加電壓於該第一、二基板21 、22間的液晶分子23時，即可以改變該液晶分子23配向 狀態，控制來自於該背光源24的穿透性，而將電子信號影 像化。由於該液晶顯示單元2的詳細結構及材料組成為本 技術領域者所周知且非為本發明的重點，因此，不再多加 贅述。 該偏光單元3具有二片偏光板31，及二片感壓膠32， 忒一片偏光板31分別藉由該二片感壓膠32貼附在該第一 、二基板21、22遠離該液晶分子23之表面，且該每一片 偏光板31包含二片由三聚醋酸纖維素構成的保護膜3ιι、 一夾設在該二片保護膜311間，由吸附碘離子延伸後的聚乙 烯醇薄膜構成的偏光膜312，由於該等偏光板31的材料組 成及結構為業界週知’因此不再多加說明。該二片感壓膠 32分別設置於該二片偏光板31與該第-、二基板21、22 間’做為貼合介質用以將該二片偏光板31與該第一、二基 板21、22彼此貼合；該每—感壓膠32依序具有一與該保 護膜311黏接的第—膠膜321、及一分別介於該第一膠膜 201245366 321與該第一基板21，及該第二基板22之間的第二膠膜 322，該第一膠膜321的組成份包括丙烯酸系樹脂，且在 25°C的黏性率介於 66000〜160000Pa，彈性率介於 126000〜180000Pa，該第二膠膜322的組成份包括丙烯酸系 樹脂，且在25°C的黏性率介於48000〜66000Pa，彈性率介 於 180000〜260000Pa。 於本較佳實施例中，該第一膠膜321是由90〜99.9wt°/〇 的甲基丙烯酸丁酯（butyl methacrylate)和曱基丙烯酸乙酯 (ethyl methacrylate)，及 0.1 〜10wt°/〇 的異氰酸自旨（isocynate)交 聯劑構成，在25°C的黏性率介於66000〜160000Pa，且彈性 率介於 126000〜180000Pa ;該第二膠膜 322 是由 90〜99.9wt%的曱基丙稀酸丁醋（butyl methacrylate)和甲基丙 稀酸乙酯（ethyl methacrylate) ' 0.1 ~10wt% 的異氰酸酯 (isocynate)交聯劑，及0.01〜5 wt°/〇的石夕院添加劑構成，在 25°C的黏性率介於黏性率介於48000〜66000Pa，且彈性率介 於 180000〜260000Pa。 此外，要再說明的是，該感壓膠32可先預製成一黏貼 單元32a，該黏貼單元32a具有一第一膠膜321、一第二膠 膜322，及二片分別貼附該第一、二膠膜321、322的第一 、二離形膜323、324，而可在貼合時分別將該黏貼單元32a 的第一、二離形膜323、324移除，即可進行偏光板與該第 一、二基板21、22的貼合。例如，可先將該黏貼單元32a 的第一離形膜323移除，與該偏光板31貼合，預製成一如 圖3所示的偏光片31a，當要將該偏光片31a與該第一基板 201245366 21貼合時，再將該第二離形膜324移除，令該第二膠膜 322與待貼合之該第一基板21表面平整貼合即可。 接著將該較佳實施例製得之感壓膠進行黏著性、耐久 性、尺寸變化率，並將製得之液晶顯示器進行邊緣窄亮漏 光測试’其結果如表1所示。 <量測方式> 黏著性測性 樣品製備： 將感壓膠貼放在偏光板’利用2kg滾輪來回滾壓兩次 令遠感壓膠與該偏光板貼合，接著將貼有感壓膠的偏光板 置於溫度50。(：、壓力0.5 MPa的條件下20分鐘，進行加壓 脫泡作業，接著靜置24小時，進行第一次黏著性測試，之 後在5 0 C的條件下靜置2天，進行第二次黏著性測試。 黏著性測試： 在環境溫度23°C，環境濕度65%，利用萬能拉力機以 每分鐘300毫米的拉伸速度測量黏著性。 耐久性測試 將經由該感壓膠貼合之該偏光板與該液晶顯示單元分 別在80°C的條件下放置1〇〇〇小時，及在6〇°c/9〇%RH的條 件下放置1000小時’再利用有刻度的放大鏡進行外觀檢測 ’分別量測其發泡大小並評價其耐久性，其評價標準以發 泡尺寸大小為依據，其標準如下所示：The elastic modulus of 23 C is not more than lxl 〇 5pa, and the elastic modulus at 80 ° C is not more than 5xl 〇 4Pa. In addition, U.S. Patent No. 2,060,023,938 discloses a pressure sensitive adhesive for a polarizing plate which is formed by illuminating a composition of a pressure sensitive adhesive comprising an acrylic copolymer and having a branch thereon. The photopolymerizable functional group of the acrylic copolymer, and the pressure sensitive adhesive has a modulus of elasticity of 0.3 to 10 MPa at 23, and a viscoelasticity at 80 ° C of not more than 201245366 5x10 Pa. It can be seen from the above description that the liquid crystal display darkness caused by the heat shrinkage of the polarizing plate 121 is improved by changing the viscoelasticity of the pressure sensitive adhesive 122 by changing the composition, viscoelasticity, crosslinking agent or additive of the pressure sensitive adhesive i22. The problem of light leakage, however, the change of the composition of such pressure sensitive adhesive 122 can improve the large-area light leakage problem of the liquid crystal display due to heat, but the heat of the polarizing plate 121 is about 6 hours after the continuous high temperature. The narrow light leakage problem of the dark edge of the edge of the liquid crystal display of about 3 to 5 mm is not effectively improved. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a pressure sensitive adhesive for connecting a liquid crystal display unit to a polarizing plate. Further, another object of the present invention is to provide a polarizing plate having a pressure sensitive adhesive. Still another object of the present invention is to provide a liquid crystal display which can improve the problem of narrow light leakage of the liquid crystal edge. Therefore, the pressure sensitive adhesive for connecting the liquid crystal display unit and the polarizing plate comprises: a first adhesive film having a viscosity at 25 ° C of 66000 to 160000 Pa and an elastic modulus of 126000 to 180000 Pa. The viscosity of a second film at 25 ° C is between 48,000 and 66000 Pa, and the elastic modulus is between 180,000 and 26,000 Pa. In addition, the polarizing plate with pressure sensitive adhesive of the present invention comprises two sheets of protective film, a polarizing film sandwiched between the two protective films, and a feeling attached to the protective film of 201245366 as a > Pressing, the pressure sensitive adhesive sequentially has a first film adhered to the film, and a second film adhered to the first film: the composition of the first film includes acryl Acid resin, the venom occupancy rate of crater is between 6_(M6()_Pa, and the elastic modulus is between 126 faces~ deleted. The composition of the second film includes acrylic resin, and the second film of hunger The liquid crystal display comprises a liquid crystal display unit, and a polarizing unit. The polarizing unit has a sticker. The liquid crystal display comprises a liquid crystal display unit and a polarizing unit. a polarizing plate for the liquid crystal display unit, and a pressure sensitive adhesive used as a bonding medium between the liquid crystal display unit and the polarizing plate, the pressure sensitive adhesive having a first adhesive film and a second adhesive film, The first adhesive film is adhered to the surface of the polarizing plate, and the composition thereof includes the viscosity of the acrylic tree 曰 曰 at 25C Between 66000 and 160000Pa, and the modulus of elasticity is between 126000 and 180000Pa, the composition of the second film includes the acrylic resin' and the viscosity of the second film at 25 ° C is between 48000 and 66000Pa, and the modulus of elasticity is The utility model has the advantages of: forming a pressure sensitive adhesive having a two-layer structure with first and second adhesive films and controlling the difference in viscosity and elastic modulus between the first and second adhesive films, respectively. Solving the problem of large-area light leakage in the dark state of the liquid crystal display due to heat' and improving the narrow light leakage problem of the dark state edge at the same time. [Embodiment] The foregoing and other technical contents, features and effects of the present invention are described in the following reference drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description of a preferred embodiment of the present invention will be apparent. 201245366 Referring to Figures 2 and 3, a preferred embodiment of a liquid crystal display of the present invention includes a liquid crystal display unit 2 and a polarizing unit 3. The liquid crystal display unit 2 has a first substrate 21, a second substrate 22 spaced apart from the first substrate 21, and a liquid crystal molecule 2 interposed between the first and second substrates 21 and 22. 3, and a backlight 24 located under the liquid crystal display unit 2. The first substrate 21 is a thin film transistor (TFT) side substrate generally known in the industry, and the second substrate 22 is a color filter ( The color filter (CF) side substrate, when a voltage is applied to the liquid crystal molecules 23 between the first and second substrates 21 and 22, the alignment state of the liquid crystal molecules 23 can be changed to control the penetration from the backlight 24. The electronic signal is imaged. Since the detailed structure and material composition of the liquid crystal display unit 2 are well known to those skilled in the art and are not the focus of the present invention, they will not be further described. The polarizing unit 3 has two polarizing plates 31 and two pressure sensitive adhesives 32. The polarizing plates 31 are attached to the first and second substrates 21 and 22 away from the liquid crystal molecules by the two pressure sensitive adhesives 32, respectively. a surface of 23, and each of the polarizing plates 31 comprises two protective films 3 ιι, composed of cellulose triacetate, sandwiched between the two protective films 311, and formed of a polyvinyl alcohol film extended by adsorbing iodide ions. The polarizing film 312 is well known in the art because of the material composition and structure of the polarizing plates 31. Therefore, the description will not be repeated. The two pressure sensitive adhesives 32 are respectively disposed between the two polarizing plates 31 and the first and second substrates 21 and 22 as a bonding medium for the two polarizing plates 31 and the first and second substrates 21 And each of the pressure sensitive adhesives 32 has a first adhesive film 321 adhered to the protective film 311, and a first adhesive film 201245366 321 and the first substrate 21, respectively. And a second adhesive film 322 between the second substrate 22, the composition of the first adhesive film 321 comprises an acrylic resin, and the adhesiveness at 25 ° C is between 66,000 and 160,000 Pa, and the elastic modulus is between 126,000 and 〜 180000Pa, the composition of the second adhesive film 322 includes an acrylic resin, and the adhesiveness at 25 ° C is between 48,000 and 66000 Pa, and the elastic modulus is between 180,000 and 26,000 Pa. In the preferred embodiment, the first adhesive film 321 is composed of 90 to 99.9 wt/min of butyl methacrylate and ethyl methacrylate, and 0.1 to 10 wt%/ The isocyanic acid is composed of an isocyanate crosslinking agent, the viscosity at 25 ° C is between 66,000 and 160,000 Pa, and the modulus of elasticity is between 126,000 and 180000 Pa; the second film 322 is from 90 to 99.9 wt. % butyl methacrylate and ethyl methacrylate '0.1 ~ 10wt% isocyanate crosslinker, and 0.01 to 5 wt ° / 石 夕The additive composition of the institute has a viscosity at 25 ° C with a viscosity ratio of 48000 to 66000 Pa and an elastic modulus of 180,000 to 26,000 Pa. In addition, it is to be noted that the pressure sensitive adhesive 32 can be pre-formed into a pasting unit 32a. The adhesive unit 32a has a first adhesive film 321 and a second adhesive film 322. The first and second release films 323 and 324 of the two adhesive films 321 and 322 can be respectively removed from the first and second release films 323 and 324 of the adhesive unit 32a, thereby performing polarizing plate and The first and second substrates 21 and 22 are bonded together. For example, the first release film 323 of the adhesive unit 32a can be removed first, and the polarizing plate 31 is bonded to the polarizing plate 31 to form a polarizer 31a as shown in FIG. 3, when the polarizer 31a and the first When the substrate 201245366 21 is attached, the second release film 324 is removed, so that the second adhesive film 322 can be flatly attached to the surface of the first substrate 21 to be bonded. Next, the pressure sensitive adhesive obtained by the preferred embodiment was subjected to adhesion, durability, dimensional change rate, and the obtained liquid crystal display was subjected to edge narrow light leakage test. The results are shown in Table 1. <Measurement method> Adhesive test sample preparation: Place the pressure sensitive adhesive tape on the polarizing plate. Use a 2kg roller to roll back and forth twice, so that the remote pressure sensitive adhesive is adhered to the polarizing plate, and then the pressure is applied. The polarizing plate of the glue was placed at a temperature of 50. (:, under a pressure of 0.5 MPa for 20 minutes, pressurization defoaming operation, followed by standing for 24 hours, performing the first adhesion test, and then standing at 50 C for 2 days for the second time Adhesion test: Adhesion test: The adhesiveness is measured at an ambient temperature of 23 ° C and an ambient humidity of 65% using a universal tensile machine at a tensile speed of 300 mm per minute. The durability test will be adhered via the pressure sensitive adhesive. The polarizing plate and the liquid crystal display unit are respectively placed at 80 ° C for 1 hour, and placed at 6 ° ° c / 9 〇 % RH for 1000 hours 'reuse the graduated magnifying glass for appearance inspection' The foaming size was measured and the durability was evaluated. The evaluation criteria were based on the foaming size, and the criteria were as follows:
^ 〇. 15mm: 〇 〇· 1 〜0.15mm:A 201245366 ^ 0.15mm:X 尺寸變化率量測 先將偏光板以感壓膠貼合於該液晶顯示單元，並於貼 合後之偏光板的四周圍各設定至少一定位點，該等定位點 對應該液晶顯示單元為第一位置，接著將其置放在8(rc條 件下6 j時之後再進行該偏光板之該些定位點量測，將 β亥些定位點對應該液晶顯示單元的位置定為第二位置，由 。亥第 一位置的差異即可算得該偏光板的尺寸變化率。 邊緣窄亮漏光測試 將以本發明該較佳實施例製得之液晶顯示器，置放在 8〇 C的溫度條件下6小時，取出回溫4小時再以漏光測 试機進行暗態亮度量測，暗態亮度量測點為：第二基板的中 央點位置，及上、下、左、右各離邊框25mm位置，邊緣窄 亮漏光評估方式為以亮度差值（△Li/LC)做評估，其評價標 準如下所示： π^ 〇. 15mm: 〇〇·1 ～0.15mm: A 201245366 ^ 0.15mm: X Dimensional change rate measurement First, the polarizing plate is attached to the liquid crystal display unit with a pressure sensitive adhesive, and after bonding the polarizing plate At least one positioning point is set around each of the four surrounding points, and the positioning points correspond to the liquid crystal display unit as the first position, and then placed in the 8 (the rc condition is 6 j, and then the positioning points of the polarizing plate are measured) The position of the positioning point corresponding to the liquid crystal display unit is determined as the second position, and the difference in the size of the first position can be calculated as the difference in the size of the polarizing plate. The edge narrow light leakage test will be compared with the present invention. The liquid crystal display prepared by the preferred embodiment is placed under the temperature condition of 8 ° C for 6 hours, and the temperature is measured for 4 hours, and then the dark state brightness measurement is performed by the light leakage tester. The dark state brightness measurement point is: second The central point position of the substrate, and the upper, lower, left and right positions are 25mm away from the frame. The narrow light leakage evaluation method is evaluated by the brightness difference (△Li/LC). The evaluation criteria are as follows: π
△ Li= Li — LC△ Li= Li — LC
LC:中央點位置亮度 Li:上、下 '左、右位置亮度 △ Li /LC $±0.3:〇 ± °-3<ALi /LC ^±0.6： Δ ±〇.6< ALi /LC: XLC: Center position brightness Li: Up and down 'left and right position brightness △ Li /LC $±0.3: 〇 ± °-3<ALi /LC ^±0.6: Δ ±〇.6< ALi /LC: X
S 10 201245366 參閱表1，表1試樣編號1〜2為本發明該較佳實施例在 感壓膠乾膜總厚度為25μπι，並於不同之第一、二膠膜厚度 比例的量測結果；試樣編號3〜4則為不具有雙層結構之感 壓膠的測試結果。 ~ 表1S 10 201245366 Referring to Table 1, Table 1 sample Nos. 1 to 2 are the measurement results of the preferred embodiment of the present invention in the total thickness of the pressure sensitive adhesive dry film of 25 μm, and the ratio of the thickness of the first and second films is different. Sample Nos. 3 to 4 are test results of a pressure sensitive adhesive having no double layer structure. ~ Table 1
試 樣 編 號 第一 膠膜 厚度 (㈣ 第二 膠膜 厚度 (㈣ 黏著力(Ν) 耐, 九性 尺寸 變化率 邊緣 窄亮 漏光 80〇Cx6hrs 初期 50〇Cx2days 80°Cxl000hr 60〇C/90%RH xlOOOhrs 1 5 20 1.95 12.0 〇 〇 -0.1 Λ 2 10 15 1.80 10.0 Δ △ -〇 t p) 3 25 0 4.35 13.5 X χ -Π Μ Γ\ 4 0 25 2.1 12.0 〇 〇 -0.08 X 由表1試樣編號3及4的結果可知，單純藉由改變感 壓膠32的黏、彈性特性’並無法有效改善液晶顯示器的邊 緣窄亮漏光問題’關用本發明感壓膠32之雙層結構設計（ 試樣編號1及2)，令該感壓膠32藉由該第一、二膠膜321 、322的黏、彈性不同’而可兼具接著及應力釋放的功用， 因此可有效改善習知液晶顯示器因偏光板受熱產生熱收 縮’所造成的邊緣窄亮漏光問題。 綜上所述，本發明藉由該感壓膠32的雙層結構設計， 令該第―、二膠膜321、322分別具有不同的黏彈性：讓該 第-膠膜321具有高黏彈性，因此可提供偏光板受熱後的 收縮應力緩和’而可改善習知因偏光板31因受熱造成的液 201245366 晶顯示器暗態大面積漏光 am ’而s亥第二耀膜322則設計 成具有較低之黏彈性’用以提供與該第-基板21或第二基 板22的⑧者性’因此’可令偏光板31在高溫條件下㈣。〔 或80。〇6小時後之尺寸變化率介於_〇〇8%〜_〇機之間，而 可有效改善液晶顯視器邊緣窄漏光的問題。 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一示意圖’說明液晶顯示器； 圖2是一示意圖，說明本發明較佳實施例之液晶顯示 器；及 圖3是一示意圖，說明黏貼單元及偏光片。Sample No. First film thickness ((4) Second film thickness ((4) Adhesion (Ν) resistance, Nine-size dimensional change rate edge narrow light leakage 80〇Cx6hrs Initial 50〇Cx2days 80°Cxl000hr 60〇C/90%RH xlOOOhrs 1 5 20 1.95 12.0 〇〇-0.1 Λ 2 10 15 1.80 10.0 Δ △ -〇tp) 3 25 0 4.35 13.5 X χ -Π Μ Γ\ 4 0 25 2.1 12.0 〇〇-0.08 X Sample number from Table 1 As can be seen from the results of 3 and 4, simply changing the viscosity and elastic properties of the pressure sensitive adhesive 32 does not effectively improve the problem of narrow light leakage at the edge of the liquid crystal display. The double layer structure design of the pressure sensitive adhesive 32 of the present invention is used. No. 1 and 2), the pressure sensitive adhesive 32 can have both the adhesion and the stress release by the difference in adhesion and elasticity of the first and second adhesive films 321 and 322, thereby effectively improving the conventional liquid crystal display. In the above, the double-layer structure design of the pressure sensitive adhesive 32 makes the first and second adhesive films 321 and 322 respectively have different light leakage problems caused by heat shrinkage of the polarizing plate. Viscoelasticity: the first film 321 has high viscoelasticity, This can provide a relaxation of the shrinkage stress after the polarizing plate is heated, and can improve the conventional large-area light leakage of the liquid 201245366 crystal display due to the heat of the polarizing plate 31. The second radiant film 322 is designed to have a lower The viscoelasticity 'supplied with the first substrate 21 or the second substrate 22' can be used to make the polarizing plate 31 at a high temperature (four). [or 80. The dimensional change rate after 6 hours is between _ 〇〇 8% ~ _ between the machine, and can effectively improve the problem of narrow light leakage at the edge of the liquid crystal display. However, the above is only the preferred embodiment of the present invention, when the invention cannot be limited thereto The scope of the implementation, that is, the simple equivalent changes and modifications made by the invention in the scope of the invention and the description of the invention are still within the scope of the invention. [Fig. 1 is a schematic illustration] FIG. 2 is a schematic view showing a liquid crystal display according to a preferred embodiment of the present invention; and FIG. 3 is a schematic view showing a pasting unit and a polarizer.
S 12 201245366 【主要元件符號說明】 2 ....... •…液晶顯示單元 311… •…保護膜 21…… •…第一基板 312… •…偏光膜 22…… 第"一基板 32·...· •…感壓膠 23…… —液晶分子 32a… •…黏貼單元 24…… $光源 321 ··· …·第一膠膜 3 ....... •…偏光單元 322… •…第二膠膜 31…… •…偏光板 323 ··· …·第一離形膜 31a… •…偏光片 324… …·第二離形膜 13S 12 201245366 [Description of main component symbols] 2 ....... •... Liquid crystal display unit 311... • Protective film 21... • First substrate 312... • Polarizing film 22... First " 32·...·•...pressure-sensitive adhesive 23...—liquid crystal molecules 32a...•...sticking unit 24... $light source 321 ·····first film 3 ....... •...polarizing unit 322...•...second film 31...•...polarizing plate 323·····first release film 31a...•...polarizer 324...the second release film 13