TWI386686B - Preparation of Optical Film and Its Product - Google Patents
Preparation of Optical Film and Its Product Download PDFInfo
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本發明是有關於一種光學膜的製備方法,特別是指一種應用於一顯示器中之光學膜的製備方法;本發明另有關於一種光學膜。The present invention relates to a method for preparing an optical film, and more particularly to a method for preparing an optical film applied to a display; the present invention further relates to an optical film.
液晶顯示器(LCD)之薄型化是當前的技術發展趨勢,而為了達到此目的,其背光模組中所採用之作為聚光片的光學膜,是包含有一基材層、一設置在該基材層上之增亮層,以及一遠離該增亮層地設置在該基材層上之背塗層(或稱為「光擴散層」),且該背塗層一般是包括有複數粒子,並使該背塗層形成出一呈凹凸狀之進光面,用以供來自於光源的光線射入。The thinning of a liquid crystal display (LCD) is a current state of the art, and in order to achieve this, an optical film used as a concentrating sheet in a backlight module includes a substrate layer and a substrate disposed thereon. a brightness enhancing layer on the layer, and a back coating (or "light diffusion layer") disposed on the substrate layer away from the brightness enhancing layer, and the back coating layer generally includes a plurality of particles, and The back coating layer is formed into a concave-convex light-incident surface for injecting light from the light source.
然而,當背光源啟動時,一般光學膜在某些觀察角度下容易被觀察者察覺到下述的兩種狀況:1.其表面上出現有彩虹紋;2.其表面上有一極為明顯,並將該光學膜表面劃分成明處與暗處的明暗分界線。這兩情況皆會降低觀察者對於所製出之LCD的視覺滿意度,因而有待改善。However, when the backlight is activated, the general optical film is easily perceived by the observer at two viewing angles as follows: 1. The rainbow pattern appears on the surface; 2. The surface is extremely visible, and The surface of the optical film is divided into light and dark boundaries between bright and dark places. Both of these conditions will reduce the viewer's visual satisfaction with the LCD produced and thus need to be improved.
另,理想中的光學膜應同步地具有高霧度(指來自於光源的光線被高度均勻化)與高輝度(意即射出多量光線);本國I287115號專利案是利用其進光面的幾何構形先把來自於光源的光線加以擴散而均勻化後,再藉由該增亮層而使光線能較集中地射出,於是在該背塗層與該增亮層兩相作用之下,一併提升了光學膜的輝度與光線均勻度,該案並言 及當其背塗層之粒子的粒徑較大時,可明顯地使霧度呈現較高的數值。於該案實施例中,該背塗層所示範的厚度是40μm。In addition, the ideal optical film should have high haze (highly homogenized light from the light source) and high brightness (meaning a large amount of light); the national I287115 patent uses the geometry of its light-incident surface. The configuration first diffuses and homogenizes the light from the light source, and then the light is more concentratedly emitted by the brightening layer, so that under the action of the back coating and the brightness enhancing layer, And improved the brightness and uniformity of the optical film, the case is also said And when the particle size of the particles of the back coat layer is large, the haze can be markedly higher. In the embodiment of the case, the thickness of the back coat was exemplified by 40 μm.
實務上卻發現,當固定該基材層與增亮層之相關操作條件,而只變動該背塗層之相關操作條件下,隨著光學膜的霧度提升之時,其增益比卻會有下降的趨勢,特別是當霧度提升到20%以上時,增益效果極可能已大幅下降,而此問題並無法藉由上述專利案之技術來解決。In practice, it has been found that when the operating conditions of the substrate layer and the brightness enhancing layer are fixed, and only the relevant operating conditions of the back coating are changed, as the haze of the optical film is increased, the gain ratio is The downward trend, especially when the haze is increased to more than 20%, the gain effect is likely to have dropped drastically, and this problem cannot be solved by the technique of the above patent.
經申請人之多方測試,發現當以一具有特殊配方之組成物來形成該光學膜之背塗層時,其僅在一較薄的厚度下,即可使所對應的光學膜表面上的彩虹紋以及明暗分界線得以完全消失。進一步地,該光學膜之增益比隨著霧度提高而大幅下降的情況,也能被有效地減緩;換言之,所製出的光學膜在具有較高霧度時,也一併地具有較高的增益比。Through a multi-party test by the applicant, it was found that when a back coating layer of the optical film is formed by a composition having a special formula, the rainbow on the surface of the corresponding optical film can be made only at a thin thickness. The lines and the light and dark lines have completely disappeared. Further, the gain ratio of the optical film can be effectively slowed down as the haze is greatly lowered; in other words, the optical film produced has a higher haze and a higher haze. Gain ratio.
因此,本發明之一目的是提供一種光學膜的製備方法,包含以下步驟:製備包含有依序堆疊之一背塗層、一基材層,與一增亮層之一光學膜,而該背塗層是使一包含有複數粒子以及具有一主膠、一主膠硬化劑,與一溶劑之主膠溶液的組成物塗佈於該基材層上後固化而形成;該方法的特徵在於:該等粒子之材質是擇自於聚甲基丙烯酸甲酯、聚苯乙烯、二氧化矽、玻璃,或此等之一組合,而該等粒子之粒徑是介於0.5μm~10μm之間;該主膠是UV 樹脂及/或熱固性樹脂;該溶劑是丁酮、甲基異丁酮、異丙醇、乙酸乙酯、甲苯,或此等之可互溶的一組合;其中,該等粒子與該主膠溶液之重量比值是介於0.001~0.03之間,該主膠溶液之固含量(即主膠在該主膠溶液中所佔的wt%)是介於20%~60%之間。Accordingly, it is an object of the present invention to provide a method of preparing an optical film comprising the steps of: preparing an optical film comprising a back coating layer, a substrate layer, and a brightness enhancing layer, and the back The coating is formed by coating a composition comprising a plurality of particles and a master glue, a master glue hardener, and a solvent master solution on the base material layer; the method is characterized in that: The material of the particles is selected from polymethyl methacrylate, polystyrene, cerium oxide, glass, or a combination thereof, and the particle diameter of the particles is between 0.5 μm and 10 μm; The main glue is UV a resin and/or a thermosetting resin; the solvent is butanone, methyl isobutyl ketone, isopropanol, ethyl acetate, toluene, or a miscible combination thereof; wherein the particles and the main gum solution are The weight ratio is between 0.001 and 0.03, and the solid content of the main glue solution (ie, the wt% of the main glue in the main glue solution) is between 20% and 60%.
參見圖1(為利說明,各元件尺寸並未依原比例繪製),本發明之另一目的是提供一種厚度薄且其表面不顯現彩虹紋與明暗分界線的光學膜1,其結構是包含有依序堆疊之一背塗層11、一基材層12,與一增亮層13;本發明光學膜1的特徵在於,其是以如上所述之本發明方法而製備,而該背塗層11之厚度是介於1~10μm之間,並包括一由該主膠所形成之固著區111,以及藉該固著區11固著並凸出於該固著區111之粒子112所形成的凸出區113,又經由本發明方法中所使用之組成物的物料用量換算,推知該背塗層111中之該等粒子112與主膠的重量比值是介於0.0017~0.15之間。Referring to FIG. 1 (for the sake of illustration, the dimensions of the elements are not drawn to the original scale), another object of the present invention is to provide an optical film 1 which is thin in thickness and whose surface does not show a rainbow line and a light-dark boundary, and its structure is included. A back coating layer 11, a substrate layer 12, and a brightness enhancing layer 13 are sequentially stacked; the optical film 1 of the present invention is characterized in that it is prepared by the method of the present invention as described above, and the back coating The layer 11 has a thickness of between 1 and 10 μm and includes a fixing area 111 formed by the main glue, and particles 112 fixed by the fixing area 11 and protruding from the fixing area 111. The formed convex region 113 is further converted by the amount of the material used in the method of the present invention, and it is inferred that the weight ratio of the particles 112 to the main rubber in the back coating layer 111 is between 0.0017 and 0.15.
參見圖1,本發明光學膜中用以形成該背塗層11之凸出區113的粒子112,僅是部份地被該固著區111所包埋並固著,因而形成出一凹凸不平且使來自於光源的光線加以均勻化之進光面114。本發明光學膜之背塗層11僅具有低厚度,不但能顧及成本,又兼可達到所訴求的功效;較佳地,該背塗層11之厚度是介於1~8μm之間;更佳地是介於1~6μm之間。關於該等粒子與主膠之重量比值的較 佳與更佳範圍,容後說明;於以下實施例中,該背塗層11之厚度是介於4~6μm之間。Referring to FIG. 1, the particles 112 of the optical film of the present invention for forming the protruding regions 113 of the back coating layer 11 are only partially embedded and fixed by the fixing region 111, thereby forming an unevenness. And the light from the light source is homogenized into the light incident surface 114. The back coating layer 11 of the optical film of the invention has only a low thickness, which can not only take into consideration the cost, but also achieve the desired effect; preferably, the thickness of the back coating layer 11 is between 1 and 8 μm; more preferably The ground is between 1 and 6 μm. Comparison of the weight ratio of the particles to the main glue The preferred and preferred range is described later; in the following embodiments, the thickness of the back coat layer 11 is between 4 and 6 μm.
本發明光學膜的製備方法,除了可使所製出的光學膜表面上無彩虹紋與明暗分界線之外,更進一步地,是以「所製出的低厚度背塗層使其所對應獲得的光學膜,能一併具有高霧度及高增益比保留率」為理想目標;其中,「增益比保留率」是意指在該背塗層設置後,對於「該基材層與增亮層一併對一固定光源之輝度增益比」的保留比率。例如,當一固定光源之輝度值為100,而透過該基材層與增亮層之作用後該輝度值提升為159.88,則該基材層結合增亮層後之增益比為59.88%;當再增設該背塗層而獲得所對應之光學膜後,其測得的輝度值若為150(意即增益比為50%),則表示該光學膜之「增益比保留率」為83.50%(也就是50/59.88)。The preparation method of the optical film of the invention can not only obtain the rainbow line and the light-dark boundary on the surface of the produced optical film, but further, the "low-thickness back coat layer produced by the film is obtained correspondingly. The optical film can have high haze and high gain ratio retention ratio as an ideal target; wherein "gain ratio retention rate" means that after the back coat layer is set, for the substrate layer and brightness enhancement The retention ratio of the layer to the luminance gain ratio of a fixed source. For example, when the luminance value of a fixed light source is 100, and the luminance value is increased to 159.88 after the substrate layer and the brightness enhancing layer are applied, the gain ratio of the substrate layer combined with the brightness enhancing layer is 59.88%; After adding the back coat layer to obtain the corresponding optical film, if the measured luminance value is 150 (that is, the gain ratio is 50%), it means that the "gain ratio retention rate" of the optical film is 83.50% ( That is 50/59.88).
因此,本發明方法除了上述之基本操作以外,為利塗佈,較佳地,該等粒子與該主膠溶液之重量比值是介於0.0025~0.025之間,而該主膠溶液之固含量較佳地則是介於25%~55%之間。於以下實施例中,該等粒子與該主膠溶液之重量比值是介於0.005~0.02之間,而該主膠溶液之固含量則是介於30%~50%之間。Therefore, in addition to the basic operations described above, in order to facilitate the coating, preferably, the weight ratio of the particles to the main gum solution is between 0.0025 and 0.025, and the solid content of the main gum solution is higher. The best is between 25% and 55%. In the following examples, the weight ratio of the particles to the main gum solution is between 0.005 and 0.02, and the solid content of the main gum solution is between 30% and 50%.
該主膠是在該背塗層形成之後用以固著該等粒子,故不論是UV樹脂(UV-curing resin)、熱固性樹脂(thermosetting resin),或是其等之混合物皆是可使用的,無特別限制;進一步地該熱固性樹脂主要可區分為環氧樹脂 (epoxy resin)與醇酸樹脂(alkyd resin)兩大系列。主膠硬化劑是一用以讓主膠硬化之用劑,因此,若使用的是UV樹脂,則所使用的主膠硬化劑即為光起始劑(photoinitiator);光起始劑之各可使用的種類以及其餘樹脂可使用的硬化劑種類,暨其等之用量範圍、照光參數等等,在本領域中都已極為熟知,不予贅述。The main glue is used to fix the particles after the back coat layer is formed, so that a UV-curing resin, a thermosetting resin, or a mixture thereof can be used. There is no particular limitation; further, the thermosetting resin can be mainly distinguished into an epoxy resin. (epoxy resin) and alkyd resin (alkyd resin) two series. The main glue hardener is an agent for hardening the main glue. Therefore, if a UV resin is used, the main glue hardener used is a photoinitiator; each of the photoinitiators can be used. The type of use and the type of hardener which can be used for the rest of the resin, the range of use thereof, the illuminating parameters, and the like are well known in the art and will not be described.
基於硬度、操作方便性、成本,以及本領域慣用者等諸多考量,較佳地,該主膠是使用屬於UV樹脂之至少具有六官能基之脂肪族胺甲酸乙酯寡聚物(aliphatic urethane oligomer)、環氧丙烯酸酯(epoxy acrylate)、雙酚-A環氧丙烯酸酯(bisphenol-A epoxy acrylate)、酚醛環氧丙烯酸酯(novolac epoxy acrylate)、聚酯二丙烯酸酯(polyester diacrylate),或此等之一組合。於以下實施例中,所使用的主膠是具有六官能基之脂肪族胺甲酸乙酯寡聚物,而所使用之光起始劑之廠牌型號是CIBA IRGACURE 184,且其用量為所對應之主膠用量的5wt%。Preferably, the master gum is an aliphatic urethane oligomer having at least a hexafunctional group belonging to a UV resin, based on hardness, ease of handling, cost, and many considerations by those skilled in the art. ), epoxy acrylate, bisphenol-A epoxy acrylate, novolac epoxy acrylate, polyester diacrylate, or One of the combinations. In the following examples, the main gum used is a hexafunctional aliphatic urethane oligomer, and the brand of the photoinitiator used is CIBA IRGACURE 184, and the amount is corresponding. The amount of the main glue is 5 wt%.
為提升本發明背塗層之品質(例如促使其表面更平坦、增加表面平滑感、防污物沾附等),本發明方法中所使用之組成物可更包含有一添加劑,例如平坦劑(leveling agent)、滑劑(lubricant)、抗污劑(antifoulant),或其等之一組合。另建議該添加劑之用量是介於所對應之主膠用量的0.3%~5%。In order to improve the quality of the back coating of the present invention (for example, to promote a flat surface, increase the smoothness of the surface, anti-soil adhesion, etc.), the composition used in the method of the present invention may further comprise an additive such as a leveling agent. Agent), a lubricant, an antifoulant, or a combination thereof. It is also recommended that the amount of the additive be between 0.3% and 5% of the corresponding amount of the main glue.
在本發明光學膜之背塗層中,當該等粒子與主膠之重量比值是介於0.0045~0.1之間時,將使得本發明光學膜同 步地具有更高的霧度值和增益比;於以下實施例中,該等粒子與主膠之重量比值是介於0.01~0.0667之間。In the back coating of the optical film of the present invention, when the weight ratio of the particles to the main rubber is between 0.0045 and 0.1, the optical film of the present invention will be The step has a higher haze value and a gain ratio; in the following examples, the weight ratio of the particles to the main gel is between 0.01 and 0.0667.
就霧度及增益比保留率而言,較佳地,其霧度是介於6.5%~66%之間,另增益比保留率較佳地則是介於60%~90%之間。另為了一併具有高霧度與高增益比保留率,較佳地本發明光學膜之霧度與增益比保留率之乘積是介於6%~42.5%之間,而霧度與增益比保留率之總和較佳地則是介於88.5%~130.5%之間。In terms of haze and gain ratio retention, preferably, the haze is between 6.5% and 66%, and the gain ratio is preferably between 60% and 90%. In addition, in order to have a high haze and a high gain ratio retention ratio, the product of the haze and the gain ratio retention ratio of the optical film of the present invention is preferably between 6% and 42.5%, and the haze and gain ratio are retained. The sum of the rates is preferably between 88.5% and 130.5%.
就本發明光學膜於以下實施例中所示範的,是具有介於7.2%~64.41%之間的霧度、介於62.79%~87.64%之間的增益比保留率、介於6.17%~41.81%之間的兩者乘積,以及介於92.9%~129.34%之間的兩者總和。在一較符合現今下游廠商所欲規格並考量技術發展方向之情況下,該等實施例則具有介於7.2%~40%之間的霧度、介於75.13%~87.64%之間的增益比保留率、介於6.17%~30.53%之間的兩者乘積、介於92.9%~113.02%之間的兩者總和。The optical film of the present invention is exemplified in the following examples, having a haze between 7.2% and 64.41%, a gain ratio retention ratio between 62.79% and 87.64%, and ranging from 6.17% to 41.81. The product of the two, and the sum of the two between 92.9% and 129.34%. In a situation that is more in line with the specifications of current downstream manufacturers and considers the direction of technology development, these embodiments have a haze between 7.2% and 40%, and a gain ratio between 75.13% and 87.64%. The retention rate, the product of between 6.17% and 30.53%, is the sum of the two between 92.9% and 113.02%.
為利於維持其品質並避免刮傷而受損,本發明光學膜之背塗層的硬度較佳地是介於2H~4H之間;於以下實施例中之各背塗層的硬度則是介於3H~4H之間。另,本發明光學膜之光穿透率較佳地是介於89%~93%之間。The hardness of the back coat layer of the optical film of the present invention is preferably between 2H and 4H in order to maintain its quality and avoid scratching; the hardness of each back coat layer in the following examples is Between 3H~4H. Further, the optical transmittance of the optical film of the present invention is preferably between 89% and 93%.
又,一具有適當幾何構形之增亮層將有助於使本發明光學膜有較高的的穿透率及增益比保留率,因此,較佳地,本發明光學膜的增亮層之結構是如USP 2005/0237641號專利案所教示者,包含有複數相互鄰接排列的彎曲稜柱單 元,各彎曲稜柱單元具有至少一彎曲延伸曲面;該彎曲延伸曲面可供引導光線(自該基材層進入該增亮層之者)傾向產生二維折射,提升聚光效率。有關於該增亮層結構之各種變化模式可參照USP 2005/0237641號專利案。Moreover, a brightness enhancing layer having a suitable geometric configuration will help to provide a higher transmittance and gain ratio retention of the optical film of the present invention. Therefore, preferably, the brightness enhancing layer of the optical film of the present invention is The structure is taught by the patent of USP 2005/0237641, and includes a plurality of curved prisms arranged adjacent to each other. And each curved prism unit has at least one curved extended curved surface; the curved extended curved surface is adapted to guide light (from the substrate layer into the brightening layer) to tend to generate two-dimensional refraction, thereby improving the light collecting efficiency. Regarding various variations of the structure of the brightness enhancing layer, reference is made to the patent of USP 2005/0237641.
再者,本發明光學膜中的增亮層之材質並未特別限制,任何目前已知可使用的樹脂亦是適用於此;例如丙烯酸酯、胺甲酸乙酯丙烯酸酯(urethane acrylate)、聚酯丙烯酸酯(polyester acrylate)、環氧丙烯酸酯(epoxy acrylate)、乙氧基化酚丙烯酸酯(phenol ethoxylated acrylate)、乙氧基化雙酚A丙烯酸酯(bisphenol A ethoxylated acrylate)、苯環氧丙烯酸酯(phenyl epoxy acrylate)、鄰-苯基苯酚乙基丙烯酸酯(o-phenylphenol ethyl acrylate)、苯硫乙基丙烯酸酯(phenylthioethyl acrylate)、苯甲基丙烯酸酯(benzyl acrylate)、六官能基之芳香族胺甲酸乙酯(hexafunctional aromatic urethane)、雙酚-A環氧丙烯酸酯、酚醛環氧丙烯酸酯、聚酯二丙烯酸酯,或此等之一組合。Further, the material of the brightness enhancing layer in the optical film of the present invention is not particularly limited, and any resin which is currently known to be used is also suitable for use; for example, acrylate, urethane acrylate, polyester Polyester acrylate, epoxy acrylate, phenol ethoxylated acrylate, bisphenol A ethoxylated acrylate, benzene epoxy acrylate (phenyl epoxy acrylate), o-phenylphenol ethyl acrylate, phenylthioethyl acrylate, benzyl acrylate, hexafunctional aromatic Hexafunctional aromatic urethane, bisphenol-A epoxy acrylate, phenolic epoxy acrylate, polyester diacrylate, or a combination of these.
本發明光學膜所選用之基材層材質除了是需具有透光性外,並無其他特殊限制,諸如聚對苯二甲酸乙二酯(polyethylene terephthalate, PET)、聚醯亞胺(polyimide, PI)、聚碳酸酯(polycarbonate, PC)、聚甲基丙烯酸甲酯(polymethyl methacrylate, PMMA)、聚乙烯(polyethylene, PE)、聚丙烯(polypropylene, PP)、聚胺酯樹酯(polyurethane resin)、三醋酸纖維素(triacetyl cellulose, TAC),皆是可使用者;而該基材之厚度則是38μm~250μm。The material of the substrate layer selected for the optical film of the present invention is not particularly limited except for the need to have light transmissivity, such as polyethylene terephthalate (PET), polyimide (PI). ), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene (PE), polypropylene (PP), polyurethane resin, triacetate The cellulose (TAC) is user-friendly; the thickness of the substrate is 38 μm to 250 μm.
本發明光學膜中的增亮層是可藉由在該基板之一表面上熱壓塑形,或在該表面上塗佈一上述樹脂之溶液而後塑型的方式,而被製出。於實施例中所示範的,是以一內含有10wt%的鄰-苯基苯酚乙基丙烯酸酯、15wt%的苯硫乙基丙烯酸酯,以及、75wt%的胺甲酸乙酯丙烯酸酯之樹脂混合溶液塗佈在一厚度為188μm之PET基板的一平面上,再塑形成如USP 2005/0237641號專利案之第一實施例,而形成出該增亮層;其中,該增亮層表面之幾何構形如該專利案之第4圖所示。The brightness enhancing layer in the optical film of the present invention can be produced by hot-press molding on one surface of the substrate or by coating a solution of the above resin on the surface and then molding. Demonstrated in the examples is a resin containing 10% by weight of o-phenylphenol ethyl acrylate, 15% by weight of phenylthioethyl acrylate, and 75 % by weight of urethane acrylate. The solution is coated on a plane of a 188 μm thick PET substrate and reshaped to form a first embodiment of the patent of USP 2005/0237641 to form the brightness enhancing layer; wherein the brightness of the surface of the brightness enhancing layer The configuration is as shown in Fig. 4 of the patent.
以下將以各實施例及比較例來說明本發明各目的之實施方式與功效。該等實施例將使用下列化學品與設備來製備或是進行測試,且若未特別說明,則皆是在常壓常壓的環境下進行。須注意的是,該等實施例僅為例示說明之用,而不應被解釋為本發明實施之限制。Hereinafter, embodiments and effects of each object of the present invention will be described with reference to the respective embodiments and comparative examples. These examples will be prepared or tested using the following chemicals and equipment, and unless otherwise specified, are carried out under atmospheric pressure and atmospheric conditions. It should be noted that the embodiments are for illustrative purposes only and are not to be construed as limiting.
1). PET基板:由Toyobo公司製備,型號為A4300。1). PET substrate: prepared by Toyobo, model A4300.
2).二氧化矽粒子:由Dagussa公司製備,型號為OK-607,平均粒徑為4.5μm。2). Cerium oxide particles: Prepared by Dagussa Corporation, model number is OK-607, and the average particle diameter is 4.5 μm.
3).主膠(具有六官能基之脂肪族胺甲酸乙酯寡聚物):由Cognis公司製備,型號為6625。3). Master gum (having a hexafunctional aliphatic urethane oligomer): Prepared by Cognis, model 6625.
4).異丙醇:由李長榮化工公司製備,純度為99%。4). Isopropanol: prepared by Li Changrong Chemical Company with a purity of 99%.
5.)光起始劑:由CIBA公司製備,型號為IRGACURE 184。5.) Photoinitiator: Prepared by CIBA Corporation, model number IRGACURE 184.
6.)鄰-苯基苯酚乙基丙烯酸酯:由Miwon Commercial公 司製備,型號為M1142。6.) o-Phenylphenol Ethacrylate: by Miwon Commercial Prepared by the company, model number is M1142.
7.)苯硫乙基丙烯酸酯:由Miwon Commercial公司製備,型號為M1162。7.) Phenylthioethyl acrylate: Prepared by Miwon Commercial, model number M1162.
8.)胺甲酸乙酯丙烯酸酯:由Miwon Commercial公司製備,型號為HR3000。8.) Amino acrylate acrylate: Prepared by Miwon Commercial, model HR3000.
9.)線桿:共五支;由R.D.S公司製備,編號各為#4、#5、#6、#8、#10,對同一固含量之組成物而言,以編號越大的線桿來塗佈,則所形成出的膜就越厚。9.) Wire rod: a total of five; prepared by RDS company, numbered #4, #5, #6, #8, #10, for the same solid content of the composition, the number of the pole When applied, the thicker the film formed.
1.表面觀察:以一特定角度觀察各待測試之光學膜上是否有顯現出彩虹紋及明暗分界線;若有,則進一步觀察該彩虹紋及明暗分界線之明顯程度。1. Surface observation: Observe whether there is a rainbow line and a light-dark boundary on each optical film to be tested at a specific angle; if so, further observe the apparent degree of the rainbow line and the light-dark boundary.
2.硬度測試:以Elcometer公司所生產,型號為3086的鉛筆硬度計,進行JIS K 5600之測試。2. Hardness test: A JIS K 5600 test was carried out using a pencil hardness tester model No. 3086 manufactured by Elcometer.
3.穿透率測試:以NIPPON公司所生產,型號為NDH-5000的霧度計,進行JIS K 7106之測試。3. Penetration test: The test of JIS K 7106 was carried out by a haze meter of the type NDH-5000 produced by NIPPON.
4.霧度測試:以上述霧度計進行JIS K 7105之測試規範。4. Haze test: The test specification of JIS K 7105 was carried out using the above haze meter.
5.增益比測試:以TOPCON公司所生產,型號為SR-3A的分光輝度計,進行TCO-03之測試。5. Gain ratio test: The TCO-03 test was carried out by a spectrophotometer manufactured by TOPCON Corporation and model SR-3A.
6.增益比保留率:其計算方式如先前所述;增亮比保留率越大者表示該實施例之增益比和該比較例越接近,功效越佳。6. Gain ratio retention rate: the calculation method is as described above; the greater the brightness ratio retention ratio, the closer the gain ratio of the embodiment is to the comparison example, and the better the power efficiency.
將用以形成各實施例(光學膜)中之背塗層的組成物,是 使用上述物料並以預定之參數(如以下表一所列)來加以配製;其中,所使用的光起始劑用量皆為固含量(主膠用量)的5%。之後搭配特定線桿,使各組成物分別對應一PET基板地塗佈於其表面上並形成濕膜後,先置於80℃烘箱乾燥3分鐘後再進行UV光(波長介於240nm~400nm,照射能量則為400~600mJ/cm2 ,照射,歷時10秒。然後,在該等基板之另一表面,塗佈上述之樹脂混合溶液後塑形出USP 2005/0237641號專利案第一實施例之一遠離該背塗層之增亮層,而獲得本發明光學膜,其結構如圖1所示,各相關元件不再贅述。The composition to be used to form the back coat layer in each of the examples (optical film) is prepared using the above materials and using predetermined parameters (as listed in Table 1 below); wherein the photoinitiator used is used. The amount is 5% of the solid content (the amount of the main glue). Then, with a specific wire rod, each composition is coated on the surface of a PET substrate and formed into a wet film, and then dried in an oven at 80 ° C for 3 minutes before UV light (wavelength between 240 nm and 400 nm, The irradiation energy is 400 to 600 mJ/cm 2 and is irradiated for 10 seconds. Then, the above-mentioned resin mixed solution is coated on the other surface of the substrate to shape the first embodiment of the USP 2005/0237641 patent. One of the optical films of the present invention is obtained by moving away from the brightening layer of the back coat layer, and its structure is as shown in FIG.
比較例與各實施例之差異僅在於該比較例只具有一基材層以及一增亮層,而不具有一背塗層。比較例僅供用以和實施例比較彩虹紋及明暗分界線之明顯程度。The comparative example differs from the respective examples only in that the comparative example has only one substrate layer and one brightness enhancing layer, and does not have a back coat layer. The comparative examples are only used to compare the apparent degree of rainbow lines and light and dark boundaries with the examples.
以下實施例中之各背塗層的硬度是介於3H~4H之間,厚度則是介於4μm~6μm之間;該等光學膜之光穿透率是介於89%~93%之間。The hardness of each of the back coatings in the following examples is between 3H and 4H, and the thickness is between 4μm and 6μm; the optical transmittance of the optical films is between 89% and 93%. .
另將本發明各實施例製備方法的相關操作參數以及所製出之光學膜的各項測試結果,列於以下各表;其中,穿透率、霧度、增益比,與增益比保留率的單位皆為%:
就彩虹紋方面,比較例的表面可明顯地觀察到,但各實施例之光學膜的表面皆已未見到彩虹紋;另,各實施例之光學膜表面的明暗如圖2所示地呈現一漸層式之變化,對照於圖3所示之比較例表面狀況,顯然各實施例表面並未能觀察到該明暗分界線的存在,因此各實施例表面予人較佳的視覺感受。In terms of the rainbow pattern, the surface of the comparative example was clearly observed, but the surface of the optical film of each of the examples had no rainbow pattern; in addition, the light and dark surface of the optical film of each example was as shown in FIG. A gradual change, in contrast to the surface condition of the comparative example shown in Fig. 3, it is apparent that the surface of each of the examples does not observe the existence of the boundary line of the light and dark, so that the surface of each embodiment gives a better visual impression.
另,於上述表一中,可發現到該等實施例之光學膜霧度值皆在7.2%以上,增益比保留率則都在62.79%以上,符合業界標準,且其等之霧度值與增益比保留率的乘積皆是在6.17%以上,其等之總和則皆是在92.9%以上。In addition, in the above Table 1, it can be found that the optical film haze values of the examples are all above 7.2%, and the gain ratio retention ratio is above 62.79%, which is in line with industry standards, and the haze values thereof are The product of the gain ratio retention ratio is above 6.17%, and the sum of them is above 92.9%.
此外,以各種霧度範圍來對應觀察該等實施例之增益比保留率,可發現霧度值介於10%~30%之間者,其等之增益保留率是介於80.34%~85.20%之間;霧度值介於30%~50%之間者,其等之增益保留率是介於71.29%~78.94%之間;霧度值介於50%以上者,其等之增益保留率是介於62.79%~78.52%之間;顯見各實施例在其霧度提高之餘,其增益比保留率亦有良好的表現,符合了同步地具有高霧度、高增益比之本領域訴求。In addition, the gain ratio retention ratios of the embodiments are observed in various haze ranges, and the haze value is found to be between 10% and 30%, and the gain retention ratio is between 80.34% and 85.20%. Between 30% and 50% of the haze value, the gain retention ratio is between 71.29% and 78.94%; if the haze value is above 50%, the gain retention ratio is equal to It is between 62.79% and 78.52%. It is obvious that in the other embodiments, the gain is better than the retention rate, which is consistent with the high-yield and high-gain ratio in the field. .
由上可知,藉由本發明光學膜的製備方法中各物料比例間的精準控制,而製備出一背塗層後,確實可使得其所對應之光學膜表面上不具有彩虹紋及明顯的明暗界線;另一方面,確實也可使得該光學膜在具有高霧度之同時,更一併地具有高增益比,從而解決業界長久以來的困擾。It can be seen from the above that, by the precise control between the proportions of the materials in the preparation method of the optical film of the invention, a back coating layer can be prepared, so that the corresponding optical film surface does not have rainbow lines and obvious light and dark boundaries. On the other hand, it is indeed possible to make the optical film have a high haze and a high gain ratio at the same time, thereby solving the long-standing trouble in the industry.
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內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內。However, the above is only the preferred embodiment of the present invention, when not The scope of the invention is to be construed as being limited by the scope of the invention and the scope of the invention.
1‧‧‧光學膜1‧‧‧Optical film
11‧‧‧背塗層11‧‧‧Back coating
111‧‧‧固著區111‧‧‧fixed area
112‧‧‧粒子112‧‧‧ particles
113‧‧‧凸出區113‧‧‧ protruding area
114‧‧‧進光面114‧‧‧Glossy
12‧‧‧基材層12‧‧‧Substrate layer
13‧‧‧增亮層13‧‧‧Enhanced layer
圖1是一剖視圖,說明本發明光學膜之結構;圖2是一照片,說明本發明實施例29之表面狀況,其明與暗之間並未被觀察到一明顯的明暗分界線,而是一漸層式的變化;以及圖3是另一照片,說明比較例光學膜之表面狀況,其明與暗之間被觀察到一明顯的明暗分界線。BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing the structure of an optical film of the present invention; and Fig. 2 is a photograph showing the surface condition of the embodiment 29 of the present invention, in which a clear boundary line between light and dark is not observed, but A gradual change; and Figure 3 is another photograph illustrating the surface condition of the comparative optical film with a distinct light-dark boundary observed between light and dark.
1‧‧‧光學膜1‧‧‧Optical film
11‧‧‧背塗層11‧‧‧Back coating
111‧‧‧固著區111‧‧‧fixed area
112‧‧‧粒子112‧‧‧ particles
113‧‧‧凸出區113‧‧‧ protruding area
114‧‧‧進光面114‧‧‧Glossy
12‧‧‧基材層12‧‧‧Substrate layer
13‧‧‧增亮層13‧‧‧Enhanced layer
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US5995288A (en) * | 1997-04-22 | 1999-11-30 | Dai Nippon Printing Co., Ltd. | Optical sheet optical sheet lamination light source device, and light-transmissive type display apparatus |
TWM307764U (en) * | 2006-09-19 | 2007-03-11 | Eternal Chemical Co Ltd | Composite optical film |
TW200740904A (en) * | 2006-01-31 | 2007-11-01 | Konica Minolta Opto Inc | Cellulose ester film, light-scattering film, poralizing plate, and liquid crystal display element |
TW200815794A (en) * | 2006-09-11 | 2008-04-01 | Mitsubishi Rayon Co | Lens sheet, planar light source device and liquid crystal display device |
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US5995288A (en) * | 1997-04-22 | 1999-11-30 | Dai Nippon Printing Co., Ltd. | Optical sheet optical sheet lamination light source device, and light-transmissive type display apparatus |
TW200740904A (en) * | 2006-01-31 | 2007-11-01 | Konica Minolta Opto Inc | Cellulose ester film, light-scattering film, poralizing plate, and liquid crystal display element |
TW200815794A (en) * | 2006-09-11 | 2008-04-01 | Mitsubishi Rayon Co | Lens sheet, planar light source device and liquid crystal display device |
TWM307764U (en) * | 2006-09-19 | 2007-03-11 | Eternal Chemical Co Ltd | Composite optical film |
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