1291063 九、發明說明： 【發明所屬之技術領域】 本發明關於一種用於液晶顯示面板的具有視角補償功 能之外貼膜。更詳而言之，本發明係關於一種可直接貼附在 液晶顯示面板上的具有視角補償功能之外貼膜，其對於液晶 影示面板具有視角補償功能，換言之，可擴大液晶顯示面板 的視角。 【先前技術】 液晶顯示器由於天生的物理特性使得使用者從不同角 度去看時畫面品質會有所變化。與正看時相比，斜看的時候 轉到當畫面品質已經變化到無法接受的臨界角度時稱之爲 該顯示器之視角。 視角的定義有三種： 1. 對比 從斜的方向去看液晶顯示器，與正看時相比，白色部分 會變暗，黑色部分會變亮，因此對比會下降。一般定義當對 比下降到1 〇的時候的角度爲該顯示器的視角。也就是定義 大於此視角的時候黑白已經不易分辨。一般面板廠商與監視 器廠商規格書上對於視角的定義最常使用這一條。 2. 灰階反轉 理論上顯示器從零灰階（黑色）到二五五灰階（白色）應該 是灰階數越高則越亮。但是液晶顯示器在某個大角度的時候 有可能看到低灰階反而比高灰階還亮，也就是看到類似黑白 反轉的現象，這種現象稱之爲灰階反轉。定義不會產生灰階 1291063 反轉現象的最大角度爲視角，也就是超過這個角度就有可能 看到灰階反轉，而灰階反轉是無法接受的影像品質。這個定 義和第一個定義的差別在於用對比定義只考慮零灰階和二 五五灰階，而灰階反轉是考慮所有的灰階。 3 .色差 從不同角度去看液晶顯示器，會發現顏色會隨著角度而 變化，比如說本來是白色畫面變得比較黃或比較藍，或是顏 色變得比較淡等等。隨著角度變大，當顏色的變化已經大到 ^ 無法接受的臨界點時，定義該角度爲視角。 在液晶顯示器（LCD)廣視角特性的要求下，最方便的方 法即在LCD的偏光膜貼上廣視角膜，所以光學薄膜廠也積 極開發各種廣視角膜。惟，目前TFT使用之廣視角補償膜 (Wide View Film，WV Film)係1996年由日本富士照相軟片 公司開發製作，由於可直接貼附在偏光板搭配TN型產品即 可達成廣視角之效果，因此快速的成爲廣視角產品主流，富 士照相軟片公司亦成爲獨佔專利之供應商，掌握價格及下游 ^ 廠商是否能順利出貨的關鍵。該廣視角膜主要由碟狀 (discotic)化合物和三醋酸纖維素（TAC)所構成。但是該廣視 角膜還是沒有解決灰階反轉的問題。 【發明內容】 " 本發明之目的即在於提供一種用於液晶顯示面板的具 有視角補償功能之外貼膜，其在構成上係不同於習知的廣視 角膜，如上述富士照相軟片公司所開發的廣視角膜，且爲外 貼式。 1291063 本發明的具有視角補償功能之外貼膜可應用於各種 大、中、小型尺寸的液晶顯示面板，爲因應市場對於廣視角 面板的需求，而開發出的具有視角補償功能之外貼膜’此具 有視角補償功能之外貼膜亦可解決灰階反轉現象，又此具有 視角補償功能之外貼膜係可控制視角大小，因此使用者可依 需求搭配。 本提案之技術特點及所解決的問題： (1)利用本發明的具有視角補償功能之外貼膜達到以外 ® 貼方式提升視角，並解決習知灰階反轉之現象。（2)技術簡 單、使用方便，可依需求不同對視角化做選擇。（3)可視角 與對比呈一關係比例，需依據實際要求設計。（4)簡化LCD 製程，少了原本內建光學補償膜之製程。 本發明之另一目的爲提供一種用於液晶顯示面板的具 有視角補償功能之外貼膜的製法，其包括使一種光擴散粒子 成分分散於貼合劑中以形成貼合膠之步驟，將所得的貼合膠 塗佈在一透明基板上之步驟，及將所得之塗佈有貼合膠的透 ^ 明基板烘乾之步驟。該貼合膠可依調製配方、塗佈乾濕厚 度、光學霧度値及清晰度値等不同，會有不一樣的視角補償 及對比效果。可將該外貼膜直接黏於各大、中、小型尺寸的 LCD面板上之最外層上，就可達到視角補償效果，包括廣視 角效果，並且也可改善灰階反轉的現象。目前硏究其視角已 可達比原始面板高出兩倍以上的視角値。視角可見度提上升 5 % 〜3 5 0 %。 本發明亦關於一種液晶顯示裝置，其使用上述定義之具 ⑧ 1291063 有視角補償功能之外貼膜，或是使用上述之具有視角補償功 能之外貼膜之製造方法所製得之外貼膜。 【實施方式】 參閱第1圖，其顯示本發明的具有視角補償功能之外貼 膜之示意剖面結構。本發明的具有視角補償功能之外貼膜主 要包括一透明基板1及一貼合膠2。 上述透明基板係可使一光源透出且爲由聚對苯二甲酸 乙二酯（PET)或三醋酸纖維素（TAC)所製成的透明基板，厚度 ® 係在20〜150微米的範圍內。又，視情況之需要，上述透明 基板上亦可具有表面處理層（未於圖示），例如防眩、防污、 抗靜電、硬度強化層等，該表面處理層之厚度係在20〜200 微米的範圍內。 上述貼合膠，係具有一貼合劑以及一光擴散粒子成分， 該貼合膠均勻配置於該透明基板之一側面上，其中，透過該 貼合膠，該透明基板可外貼於一顯示裝置射出顯示畫面之面 上，且透過該外貼膜，可使該顯示裝置所射出之一顯示畫面 ^ 在視角上得以提升。上述貼合膠配置於該側面上之厚度範圍 爲5〜1 00微米。上述貼合劑包括一主劑、一溶劑以及一添 加劑。該主劑、該溶劑以及該添加劑可分別爲一壓克力樹 脂、甲基乙基酮（MEK)，以及壓克力系硬化劑。上述主劑、 光擴散粒子、溶劑以及該添加劑，係分別佔該貼合膠總成分 之百分比爲 7 1 % 〜7 6 %、0.7 6 °/〇 〜7 · 1 %、2 1 · 3 % 〜2 2 · 8 %、 〇 · 0 7 6 % 〜0 · 1 4 %。 上述光擴散粒子係爲聚甲基丙烯酸甲酯（PMMA)、聚苯 ⑧ 1291063 乙烯（PS)等高分子粒子或二氧化鈦（Ti〇2)、二氧化矽（Si02) 等無機粒子，其粒徑分佈係在3 00奈米〜50微米的範圍內， 其含Μ爲貼合膠總成分之1〜1 5 %。 於依本發明的一實施態樣中，上述外貼膜可更包括一附 加功能膜，其係設置於該透明基板射出該顯示畫面之面上。 該附加功能膜可爲選自於一抗眩膜、一抗反射膜、與一抗眩 /抗反射膜 參閱第2圖，其爲本發明的具有視角補償功能之外貼膜 ^ 之製造流程圖。本發明的製造流程包括使一種光擴散粒子成 分分散於貼合劑中以形成貼合膠之步驟（配製步驟3)，將所 得的貼合膠塗佈在一透明基板上之步驟（塗佈步驟4)，及將 所得之塗佈有貼合膠的透明基板烘乾之步驟（乾燥步驟5)。 此具有視角補償功能之外貼膜可貼合於任一形式之液晶顯 示器面板，例如ΤΝ模式、VA模式、ΙΡΑ模式之最外層，使 之具有視角補償效果。 於上述之本發明的製造流程中，該透明基板例如爲三醋 ^ 酸纖維素（TAC)或聚對苯二甲酸乙二酯（PET)，該貼合膠塗佈 於該透明基板上之厚度例如爲在5〜1 00微米的範圍，該貼 合劑例如包括有一主劑、一溶劑以及一添加劑，該主劑、該 溶劑以及該添加劑例如分別爲一壓克力樹脂、甲基乙基酮 (MEK)以及壓克力系硬化劑，該主劑、該光擴散粒子、該溶 劑以及該添加劑例如分別佔該貼合膠總成分之百分比爲 7 1 % 〜7 6 %、0 · 7 6 % 〜7 · 1 %、2 1 . 3 % 〜2 2 · 8 %、0 · 〇 7 6 °/〇 〜〇 · 1 4 %。 透過上述外貼膜，可使顯示裝置所射出之顯示畫面在視 ⑧ .1291063 角上之最大値，爲原本視角的2倍。 於依本發明的一實施態樣中，上述製造方法更包括一在 該透明基板射出該顯示畫面之面上設置上述所定義的附加 功能膜之步驟，其中該附加功能膜可於一抗眩膜、一抗反射 膜，與一抗眩/抗反射膜間擇一。 參閱第3圖，其爲本發明的具有視角補償功能之外貼膜 之應用例。圖中，數字1 1係指一般液晶顯示器的內層部位， 例如兩片玻璃基板夾著液晶層等，數字1 〇和1 2分別係指下 ® 偏光板和上偏光板，而數字1 3係指本發明的具有視角補償 功能之外貼膜。 實驗例： 使用EZContrast測試系統（法國ELDIM公司製）來測量 以下各種不同的組合之視角特性。該系統係使用被冷卻到零 下1 0°C的C CD感光陣列，利用特殊的光學透鏡，可以測量 出液晶顯示器朝水平方向和垂直方向+/-80度視角範圍內任 $ 何方向上發光的色度和亮度，結果通過彩色等高圖表示。資 料點距離中心點的遠近程度表明了視角的大小（即視線和螢 幕垂線的夾角）。中心點時視線垂直於螢幕，視角爲0度， 最邊緣處視角最大，爲8 0度。圖的水平方向對應了水平視 角’垂直方向對應於垂直視角，整幅圖反映了當人從螢幕左 側到右側’上端到下端，所有位置看到的螢幕上的畫面的對 比度變化情況，即視角與對比的關係。 第4(A)圖爲無補償膜偏光片+LCD +無補償膜偏光片的 組合之測量結果，係當作比較例。第4(B)圖爲有補償膜偏光 ‘1291063 片+LCD +有補償膜偏光片的組合之測量結果’亦當作比較 例。第4(C)圖爲表處理TAC +貼合膠（高光學）+市售面板之測 量結果。第4(D)圖係表處理PET +貼合膠（高光學）+市售面板 之測量結果。第4(E)圖係表處理PET +貼合膠（中光學）+市售 面板之測量結果。第4(F)圖係一般PET +貼合膠（低光學）+市 售面板之測量結果。又，圖中橫軸爲視角。 由所測得的結果可知，第4(C)至4(F)圖之視角係優於第 4(A)和4(B)者。第4(C)和4(D)者之膠性相同，但外層膜材 • 不同，而有不同的表現。第4(D)和4(E)者之外層膜材相同， 但膠性不同，而有不同的表現。第4(F)圖爲外層膜材與膠性 同時都改變，又可得不同的效果，其與第4(B)圖比較下就有 視角提升效果了。 因此，本發明的具有視角補償功能之外貼膜對於液晶顯 示面板的視角有顯著的改良。 【圖式簡單說明】 第1圖顯示本發明的具有視角補償功能之外貼膜之示意 ®剖面結構。 第2圖顯示本發明的具有視角補償功能之外貼膜之製造 流程圖。 第3圖顯示本發明的具有視角補償功能之外貼膜之應用 例。 第4(A)至4(F)圖爲使用液晶視角色度測量儀對不同的 組合之測量結果。119. The invention relates to a film having a viewing angle compensation function for a liquid crystal display panel. More specifically, the present invention relates to a film having a viewing angle compensation function which can be directly attached to a liquid crystal display panel, which has a viewing angle compensation function for the liquid crystal display panel, in other words, can expand the viewing angle of the liquid crystal display panel. [Prior Art] Due to the inherent physical characteristics of the liquid crystal display, the quality of the picture changes when the user looks at a different angle. When viewed obliquely, it is referred to as the viewing angle of the display when the quality of the image has changed to an unacceptable critical angle. There are three definitions of the angle of view: 1. Contrast Looking at the LCD monitor from the oblique direction, the white portion will be darker and the black portion will be brighter than when you are looking at it, so the contrast will drop. The general definition of the angle when the contrast drops to 1 为 is the viewing angle of the display. That is to say, when the definition is larger than this angle, black and white is not easy to distinguish. This is most commonly used for the definition of viewing angles in the general panel manufacturer and monitor manufacturer specifications. 2. Gray-scale reversal Theoretically, the display should be brighter from zero grayscale (black) to 255 grayscale (white). However, when the liquid crystal display is at a certain angle, it is possible to see that the low gray level is brighter than the high gray level, that is, a phenomenon similar to black and white inversion, which is called gray scale inversion. The definition does not produce gray scales. 1291063 The maximum angle of the inversion phenomenon is the angle of view, that is, beyond this angle, it is possible to see the grayscale inversion, which is an unacceptable image quality. The difference between this definition and the first definition is that only zero-gray and 255 gray-scale are considered with the contrast definition, while gray-scale inversion considers all gray levels. 3. Color difference Looking at the liquid crystal display from different angles, you will find that the color changes with the angle. For example, the white picture is yellow or blue, or the color becomes lighter. As the angle becomes larger, when the color change has become too large to an unacceptable critical point, the angle is defined as the angle of view. Under the requirements of the wide viewing angle characteristics of liquid crystal displays (LCDs), the most convenient method is to attach a wide viewing angle film to the polarizing film of the LCD, so the optical film factory has also actively developed various wide viewing angle films. However, the Wide View Film (WV Film) used in TFT is developed and manufactured by Fuji Photo Film Co., Ltd. in Japan in 1996. Since it can be directly attached to a polarizing plate and a TN type product, a wide viewing angle can be achieved. Therefore, it has quickly become the mainstream of wide viewing angle products. Fuji Photo Film Co., Ltd. has also become a supplier of exclusive patents, and it is the key to know whether the price and downstream manufacturers can ship smoothly. The wide viewing angle film is mainly composed of a discotic compound and cellulose triacetate (TAC). However, the wide-angle cornea still does not solve the problem of gray-scale reversal. SUMMARY OF THE INVENTION An object of the present invention is to provide a film having a viewing angle compensation function for a liquid crystal display panel, which is different in composition from a conventional wide viewing angle film, as developed by the above-mentioned Fuji Photo Film Co., Ltd. The wide viewing angle film is externally attached. 1291063 The film with the viewing angle compensation function of the present invention can be applied to various large, medium and small size liquid crystal display panels, and has a viewing angle compensation function developed in response to the demand for wide viewing angle panels in the market. In addition to the viewing angle compensation function, the film can also solve the gray-scale reversal phenomenon, and the film compensation function can control the viewing angle in addition to the viewing angle compensation function, so the user can match the requirements. The technical features of the proposal and the problems to be solved are as follows: (1) The use of the viewing angle compensation function of the present invention achieves the viewing angle and the conventional gray scale inversion phenomenon. (2) The technology is simple and easy to use, and it can be selected according to different needs. (3) The angle of view and the contrast are in a relationship, which needs to be designed according to actual requirements. (4) Simplify the LCD process and reduce the process of the original built-in optical compensation film. Another object of the present invention is to provide a method for a film having a viewing angle compensation function for a liquid crystal display panel, which comprises the steps of dispersing a light diffusing particle component in a bonding agent to form a bonding glue, and applying the resulting sticker The step of coating the gel on a transparent substrate and drying the obtained transparent substrate coated with the adhesive. The adhesive can have different viewing angle compensation and contrast effects depending on the formulation, dry and wet thickness, optical haze and clarity. The outer film can be directly adhered to the outermost layer of the large, medium and small size LCD panels to achieve the viewing angle compensation effect, including the wide viewing angle effect, and also can improve the gray scale inversion phenomenon. At present, the angle of view has reached more than twice the angle of view than the original panel. The visibility of the viewing angle is increased by 5 % ~ 3 5 0 %. The present invention also relates to a liquid crystal display device which uses the above-described definition of a film having a viewing angle compensation function of 8 1291063 or a film produced by using the above-described method for producing a film other than the viewing angle compensation function. [Embodiment] Referring to Fig. 1, there is shown a schematic cross-sectional structure of a film having a viewing angle compensation function of the present invention. The film having the viewing angle compensation function of the present invention mainly comprises a transparent substrate 1 and a bonding paste 2. The transparent substrate is transparent to a light source and is made of polyethylene terephthalate (PET) or cellulose triacetate (TAC), and the thickness is in the range of 20 to 150 micrometers. . Moreover, the transparent substrate may have a surface treatment layer (not shown), such as anti-glare, anti-fouling, antistatic, hardness-enhancing layer, etc., depending on the situation, and the thickness of the surface treatment layer is 20 to 200. Within the micrometer range. The bonding adhesive has a bonding agent and a light-diffusing particle component, and the bonding glue is uniformly disposed on one side of the transparent substrate, wherein the transparent substrate can be externally attached to a display device through the bonding adhesive. When the surface of the display screen is emitted and the outer film is passed through, one of the display screens emitted by the display device can be improved in viewing angle. The above-mentioned bonding glue is disposed on the side surface in a thickness ranging from 5 to 100 μm. The above-mentioned adhesive includes a main agent, a solvent, and an additive. The main agent, the solvent, and the additive may be an acrylic resin, methyl ethyl ketone (MEK), and an acrylic hardener, respectively. The main agent, the light-diffusing particles, the solvent and the additive respectively account for 7 1 % to 7 6 %, 0.7 6 ° / 〇 7 7 %, 2 1 · 3 % of the total composition of the adhesive. 2 2 · 8 %, 〇 · 0 7 6 % ~0 · 1 4 %. The light-diffusing particles are polymer particles such as polymethyl methacrylate (PMMA), polyphenyl 8 1291063 ethylene (PS), or inorganic particles such as titanium dioxide (Ti 2 ) and cerium oxide (SiO 2 ). It is in the range of 300 nm to 50 μm and contains Μ1 to 15% of the total composition of the adhesive. In an embodiment of the invention, the external film may further include an additional functional film disposed on a surface of the transparent substrate that emits the display image. The additional functional film may be selected from the group consisting of an anti-glare film, an anti-reflection film, and an anti-glare/anti-reflection film. Referring to Figure 2, it is a manufacturing flow diagram of the film having a viewing angle compensation function. The manufacturing process of the present invention comprises the steps of dispersing a light-diffusing particle component in a bonding agent to form a laminating adhesive (Preparation Step 3), and coating the obtained laminating adhesive on a transparent substrate (coating step 4) And a step of drying the obtained transparent substrate coated with the adhesive (drying step 5). In addition to the viewing angle compensation function, the film can be attached to any type of liquid crystal display panel, such as the outermost layer of the ΤΝ mode, the VA mode, and the ΙΡΑ mode, so as to have a viewing angle compensation effect. In the above manufacturing process of the present invention, the transparent substrate is, for example, cellulose triacetate (TAC) or polyethylene terephthalate (PET), and the thickness of the adhesive coated on the transparent substrate is For example, in the range of 5 to 100 μm, the adhesive includes, for example, a main component, a solvent, and an additive, and the main agent, the solvent, and the additive are, for example, an acrylic resin, methyl ethyl ketone ( MEK) and an acryl-based hardener, the main agent, the light-diffusing particles, the solvent, and the additive, for example, respectively, account for 7 1% to 7 6 %, 0 · 7 6 % of the total composition of the adhesive; 7 · 1 %, 2 1 . 3 % ~ 2 2 · 8 %, 0 · 〇 7 6 ° / 〇 ~ 〇 · 1 4 %. Through the above-mentioned external film, the maximum 値 of the display screen emitted by the display device at the angle of Δ1291063 can be doubled as the original viewing angle. In an embodiment of the invention, the manufacturing method further includes the step of providing the above-defined additional functional film on the surface of the transparent substrate on which the display screen is projected, wherein the additional functional film is applicable to an anti-glare film. , an anti-reflective film, and an anti-glare / anti-reflective film. Referring to Fig. 3, there is shown an application example of a film having a viewing angle compensation function of the present invention. In the figure, the numeral 1 1 refers to the inner layer portion of a general liquid crystal display, for example, two glass substrates sandwich a liquid crystal layer, and the numbers 1 〇 and 1 2 are respectively referred to as a lower polarizing plate and an upper polarizing plate, and the numeral 1 3 is Refers to the film of the present invention having a viewing angle compensation function. Experimental Example: The viewing angle characteristics of the following various combinations were measured using an EZ Contrast test system (manufactured by ELDIM, France). The system uses a C CD photosensitive array that is cooled to minus 10 ° C. Using a special optical lens, it is possible to measure the color of the liquid crystal display in any direction within a range of +/- 80 degrees in the horizontal and vertical directions. Degree and brightness, the results are represented by a color contour map. The closeness of the data point from the center point indicates the size of the angle of view (ie, the angle between the line of sight and the vertical line of the screen). At the center point, the line of sight is perpendicular to the screen, the angle of view is 0 degrees, and the angle of view at the most edge is the largest, at 80 degrees. The horizontal direction of the figure corresponds to the horizontal viewing angle. The vertical direction corresponds to the vertical viewing angle. The whole image reflects the contrast change of the screen on the screen seen by all the people from the left side to the right side of the screen from the left side to the right side. Contrast relationship. Fig. 4(A) shows the measurement results of the combination of the uncompensated film polarizer + LCD + uncompensated film polarizer, and is taken as a comparative example. Fig. 4(B) shows the measurement results of the combination of '1291063 piece + LCD + compensation film polarizer' with compensation film polarization as a comparative example. Figure 4(C) shows the results of the table processing of TAC + adhesive (high optical) + commercially available panels. Figure 4(D) shows the measurement results of PET + adhesive (high optical) + commercially available panels. Figure 4(E) shows the measurement results of PET + Laminated Glue (Medium Optics) + commercially available panels. Figure 4(F) shows the measurement results for a typical PET + adhesive (low optics) + commercially available panel. Moreover, the horizontal axis in the figure is the angle of view. From the measured results, it is understood that the viewing angles of Figs. 4(C) to 4(F) are superior to those of Figs. 4(A) and 4(B). The 4(C) and 4(D) have the same gel properties, but the outer membranes are different and have different performances. The outer layers of the 4(D) and 4(E) are the same, but the gel properties are different and have different performances. Figure 4(F) shows that both the outer membrane and the gelatinity change at the same time, and different effects can be obtained. Compared with the fourth (B) diagram, there is a viewing angle enhancement effect. Therefore, the film having the viewing angle compensation function of the present invention has a remarkable improvement in the viewing angle of the liquid crystal display panel. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a schematic ® cross-sectional structure of a film having a viewing angle compensation function of the present invention. Fig. 2 is a flow chart showing the manufacture of a film having a viewing angle compensation function of the present invention. Fig. 3 is a view showing an example of application of the film having the viewing angle compensation function of the present invention. Figures 4(A) through 4(F) show the measurement results for different combinations using a liquid crystal visual character measurer.
-11- 1291063 【元 件符 號 說 明】 1 透 明 基 板 2 貼 合 膠 3 配 製 步 驟 4 塗 佈 步 驟 5 乾 燥 步 驟 11 內 層 部 位 10 下 偏 光 板 11 內 層 部 位 12 上 偏 光 板 13 具 有 視 角補償功能之外貼膜-11- 1291063 [Description of the symbol] 1 Transparent substrate 2 Adhesive 3 Preparation step 4 Coating step 5 Drying step 11 Inner layer 10 Lower polarizing plate 11 Inner layer 12 Upper polarizing plate 13 With viewing angle compensation function
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