A7 4 63 05 9 B7 五、發明說明（1 ) 發明背景 本發明係關於一光學薄膜加上一反射光罩來用於一光導 引系統。該光罩可做爲隱藏該光導的觀視者區域，而呈現 發光區域，特別是當一光源，像是一冷陰極螢光棒，配合 於該光導時。 例如那些用於監視器及發射電子顯示器的背光，特別是 那些用於筆記型電腦顯示器者，其通常大約爲1〇 mm厚。 這種背光包含一光導，其内部可完全地反射光線。基本 上，光線是由一冷陰極螢光棒（CCFT)進入該光導》來自該 CCFT的光線即由複數個光學媒體所接收，其包含一反射 器，一影像產生裝置，至少一基本上用於吸收的偏光器， 及多種額外的薄膜，其包含擴散器，反射偏光器，及其它 亮度增進薄膜。該反射器基本上係位在或靠近該光導的一 主要表面上，其係相對於產生可觀視影像的表面。一薄膜 電晶體液晶（TFT LC)顯示器可做爲一種形式的影像產生裝 置。 現今的背光在厚度上已降至5 mm或更少。因爲背光愈來 愈薄，先前技藝所無法適當處理的設計問題已被發現到。 舉例而言，有需要來結合多種薄膜的功能性來協助減小厚 度。再者，其已發現到當該光導成爲更薄時，背光即變得 比較無效。伴隨而來地是，該較低的效率會造成一些不想 要的觀視特性，例如觀視者需承受一發光區域的能力，特 別是該CCFT或邊緣反射器耦合於該光導時。 亮度增進薄膜已用來增加一些效率，但仍無法去除這種 -4 - 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁)A7 4 63 05 9 B7 V. Description of the invention (1) Background of the invention The present invention relates to an optical film and a reflective mask for a light guide system. The photomask can be used as a viewer area to hide the light guide, and present a light-emitting area, especially when a light source, such as a cold cathode fluorescent rod, fits the light guide. Backlights for monitors and e-electronic displays, especially those for notebook computer displays, are typically about 10 mm thick. This backlight contains a light guide that completely reflects light inside. Basically, light is entered into the light guide by a cold cathode fluorescent rod (CCFT). The light from the CCFT is received by a plurality of optical media, which includes a reflector, an image generating device, at least one basically used for Absorptive polarizers, and various additional films including diffusers, reflective polarizers, and other brightness enhancing films. The reflector is basically located on or near a major surface of the light guide, which is opposite to the surface on which the observable image is produced. A thin film transistor liquid crystal (TFT LC) display can be used as a form of image generating device. Today's backlights have been reduced in thickness to 5 mm or less. As the backlight becomes thinner and thinner, design issues that have not been adequately addressed by previous techniques have been identified. For example, there is a need to combine the functionality of multiple films to help reduce thickness. Furthermore, it has been found that as the light guide becomes thinner, the backlight becomes less effective. Concomitantly, the lower efficiency can cause unwanted viewing characteristics, such as the ability of the viewer to withstand a light-emitting area, especially when the CCFT or edge reflector is coupled to the light guide. The brightness enhancement film has been used to increase some efficiency, but it still cannot be removed -4-This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page )
l·--- 訂------- -線J 經濟部智慧財產局員工消費合作社印製 4 63 05 9 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（2 ) 不想要的發光區域。在一些背光的架構中，例如在美國專 利編號5, 537, 296中所提出，外殼的一部份或是部份環繞該 光源的一反射器，可以延伸出該光源來覆蓋該光導的一邊 緣，因此可最小化任何可察覺到的亮點。另外，製造商也 可加入一黑色光罩螢幕在該擴散器或其它薄膜上，其可位 在，或在該影像產生裝置的背部主要表面及該光導的前面 主要表面之間。不幸地是，黑色光罩僅能吸收光線，並無 法循環利用接近該光單的光線。本發明即可滿足此需要， 藉由提供一反射光罩，其可循環利用光線，並在去除不想 要的發光區域時，可增加該顯示器的亮度。 發明概诚 根據本發明，一光學薄膜包含一材料層，其特性爲傳送 一邵份的進入該材料層的電磁輻射，其中該材料層可包含 一外圍邊緣部份’並具有一反射光罩可覆蓋至少該光學薄 膜的該外園邊緣部份的一部份。該光罩具有至少一個反射 侧面’用於沿著該邊緣部份來反射該進入的電磁輻射，其 會造成在接近該光導的邊緣部份產生發光區域，當該材料 層由相對於該反射側的侧面來觀視時。另一方面，本發明 包含一光導組件，其包含有該光學薄膜，及一包含該光導 組件的一顯示裝置。 圖式簡單説明 圖1所示爲根據本發明所構建的一背光顯示器的一範例的 一***透视圖。 圖2所不爲根據本發明所構建，包含於—光導組件的範例 -5 太紙張尺度適用中國國茨禮進Λ』、二 Μ 公 / y X υ 1 ζ y ο 1 > \ (請先閱讀背面之注意事項再填寫本頁) -c,: l·---訂---------線· 包含一反射光罩 A7 B7 五、發明說明（3 ) 元件的展開圖。 圖3所示爲一種形式的光學層的範例 的範例。 圖4所示爲應用到一光學層底部的一反射光罩的一範例的 側視圖。 圖5所示爲應用到一光學層頂部的一反射光罩的一範例的 側視圖。 圖6A所示爲應用到一光學層相反側的反射性及非反射性 光罩的一範例的側視圖。 圖6B所示爲應用到一光學層相同側的反射性及非反射性 光罩的一範例的側視圖。 圖7所示爲應用到一光導组件的不同光學層的反射性及非 反射性光罩的一範例的侧視展開圖。 詳細説明 圖1所示爲根據本發明所建構的一背光顯示器1〇的一範例 的***透視圖。該背光顯示器1〇包含—外殼16，其包含一 光學窗12,可用於觀視所顯示的資訊。一光導組件18即固 定在該外殼之内。一光源14即固定在該光導組件18的一邊 緣。在本發明的一具體實施例中，該光源14可以是適用於 一背光顯示器的任何已知的光源，例如像是一冷陰極螢光 棒。該光導組件18包含靠近於該光源的—邊緣部份15。在 本發明的一具體實施例中，一反射表面，像是一多層反射 鏡，可以耦合於並不靠近該光源的該光導的邊緣部份。此 外，可有超過一個的光源耦合於該光導。舉例而言，多個 6- ί請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 I l·---訂---------線人^------------------if___ 經濟部智慧財產局員工消費合作社印製 4 63 05 3 A7 ----------B7_ 五、發明說明（4 ) 光源可以轉合於該光導的相同邊緣，如圖所示，例如在美 國專利编號5, 537, 296中所提出，或者是一個或多個光源可 被耦合到該光導的多個邊緣。每當光源或反射面被耦合於 該光導的一邊緣或其它部份時，即會產生不想要的亮點。 一般而言’本發明的光罩可被用於降低不想要的觀視效 應，其是在每當光線並未有效地耦合到該光導時而發生。 圖2所示爲根據本發明所構建的一光導组件1 8，其中所包 含元件的一範例之展開圖。對於本技藝的那些專業人士可 以瞭解到此處所揭示内容的好處，該光導组件18可以不同 的光學層的組合來構成。圖2所示的範例説明了複數個光學 層的組合，其包含有一第一光學層，分別通過第11個光學層 2〇，22，24，26，28及3〇。每個該複數個光學層皆可自行包 含複數個光學薄膜層’如同多層薄膜的狀況。一反射光罩 110覆蓋至少一層光學層的至少一主要表面的該外圍邊緣部 份的至少一部份。 在一有用的具體實施例中，該光學層20 , 22，24，26，28 及30較佳地是包含一光導，一影像產生裝置，像是一液晶 (如TFT LC)顯示器，至少！個偏光器，基本上用於吸收，及 多種額外的薄膜’其包含擴散器，反射偏光器，及其它亮 度增進薄膜’其用來產生一可觀視的顯示器。舉例而言， 該第一光學層20可包含一反射器，接著是一光導，然後是 擴散器，反射偏光器，保護覆蓋膜，及其它亮度增進膜， 以及一光閘裝置，像是一液晶顯示器，其係根據已知的顯 示器設計原則。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) ----訂---------線', 4 63 05 9 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（5 ) 該光罩的一個目的是防止該觀視者察覺到靠近該光源， 多光源或反射面耦合到該光導的發光區域。因此，該光導 的配置係用來覆蓋住會呈現不需要亮度的區域。該光罩較 佳地是放置在最接近該光導的主要表面上，所以在該光罩 附近的兩個偏光光線皆可被循環利用。在其它有用具體實 施例中，該光罩110可被放置在任何在該光導及一光閘層或 影像產生裝置之間的光學元件上，較佳地是在最靠近該光 導的主要表面上。 圖3所示爲一種形式的光學層28的一範例，其包含一反射 光罩的範例。該光學層28的一部份由一反射光罩110覆蓋， 其具有一内緣101及一外緣1〇2 ^該外緣1〇2可被視爲該光罩 離該光學層2 8的中心最遠的部份《在一具體實施例中，該 材料層包含一具有一周長的選定幾何形狀的一光學薄膜， 其中被該光罩覆蓋的一邊緣部份係與該光學層的至少部份 周長重疊。該反射光罩可以是均勻的密度，或其反射性可 能由該外緣102到該内緣1 〇 1做逐漸地變化。 在本發明的一較佳具體實施例中，該光學層28包含一反 射偏光器》但是，其必須瞭解到，該光學層28可包含任何 合適的光學層形式。其它可讓該光罩使用的光學材料包含 有稜形膜，像是亮度增進膜，其商標爲美國Minnesota州， St· Paul的3M公司所生產的BEF，曲面或大型擴散器，覆蓋 片可爲清晰擴散或輕微擴散，或是雙色性偏光器。 在一反射偏光器的情況下，任何有用的偏光器元件皆可 用於傳送任何所須需要的偏光。基本上，該反射偏光元件 -8 - 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公爱） (請先閱讀背面之注意事項再填寫本頁)l · --- Order --------Line J Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 63 05 9 A7 B7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (2) The area to be illuminated. In some backlight architectures, such as proposed in US Patent No. 5,537, 296, a part of the housing or a reflector surrounding the light source can extend the light source to cover an edge of the light guide. , So you can minimize any perceived bright spots. Alternatively, the manufacturer may add a black mask screen to the diffuser or other film, which may be located between, or between, the major surface of the back of the image generating device and the major surface of the front of the light guide. Unfortunately, the black mask can only absorb light and cannot recycle light that is close to that light sheet. The present invention can meet this need. By providing a reflective mask, which can recycle light and increase the brightness of the display when unwanted light-emitting areas are removed. SUMMARY OF THE INVENTION According to the present invention, an optical film includes a material layer, which is characterized by transmitting a small amount of electromagnetic radiation entering the material layer, wherein the material layer may include a peripheral edge portion and has a reflective mask Covering at least a portion of the outer edge portion of the optical film. The photomask has at least one reflecting side for reflecting the incoming electromagnetic radiation along the edge portion, which will cause a light-emitting area to be generated near the edge portion of the light guide. When looking at the side. In another aspect, the present invention includes a light guide assembly including the optical film, and a display device including the light guide assembly. Brief Description of the Drawings Fig. 1 is an exploded perspective view showing an example of a backlight display constructed according to the present invention. Fig. 2 is not constructed according to the present invention, and is included in the example of a light guide assembly-5 paper scales are applicable to China's National Ci Li Jin Λ ", two megapixels / y X υ 1 ζ y ο 1 > \ (Please first Read the notes on the back and fill in this page) -c ,: l · --- order --------- line · Contains a reflective mask A7 B7 V. Explanatory view of the element (3) Expansion diagram of the element. Figure 3 shows an example of an example of a form of optical layer. Figure 4 shows a side view of an example of a reflective mask applied to the bottom of an optical layer. Figure 5 shows a side view of an example of a reflective mask applied on top of an optical layer. Figure 6A is a side view showing an example of a reflective and non-reflective mask applied to the opposite side of an optical layer. Figure 6B shows a side view of an example of a reflective and non-reflective mask applied to the same side of an optical layer. FIG. 7 is a side expanded view of an example of a reflective and non-reflective photomask applied to different optical layers of a light guide assembly. DETAILED DESCRIPTION FIG. 1 is an exploded perspective view showing an example of a backlight display 10 constructed in accordance with the present invention. The backlit display 10 includes a housing 16 which includes an optical window 12 for viewing the displayed information. A light guide assembly 18 is fixed in the housing. A light source 14 is fixed on one edge of the light guide assembly 18. In a specific embodiment of the invention, the light source 14 may be any known light source suitable for a backlight display, such as a cold cathode fluorescent rod, for example. The light guide assembly 18 includes an edge portion 15 near the light source. In a specific embodiment of the invention, a reflective surface, such as a multilayer mirror, may be coupled to an edge portion of the light guide that is not close to the light source. In addition, more than one light source may be coupled to the light guide. For example, multiple 6- ί Please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs I l ------ Order --------- Informant ^ ------------------ if___ Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 63 05 3 A7 ---------- B7_ V. Description of the invention ( 4) The light source can be turned on the same edge of the light guide, as shown in the figure, for example, as proposed in US Patent No. 5,537, 296, or one or more light sources can be coupled to multiple edges of the light guide . Whenever a light source or reflective surface is coupled to an edge or other part of the light guide, an unwanted bright spot is produced. Generally speaking, the photomask of the present invention can be used to reduce unwanted viewing effects, which occurs whenever light is not effectively coupled to the light guide. Fig. 2 shows an expanded view of an example of the components contained in a light guide assembly 18 constructed according to the present invention. Those skilled in the art will appreciate the benefits of what is disclosed herein, and the light guide assembly 18 may be constructed from a combination of different optical layers. The example shown in FIG. 2 illustrates a combination of a plurality of optical layers, which includes a first optical layer passing through the eleventh optical layers 20, 22, 24, 26, 28, and 30, respectively. Each of the plurality of optical layers may itself include a plurality of optical film layers' as in the case of a multilayer film. A reflective mask 110 covers at least a portion of the peripheral edge portion of at least a major surface of at least one optical layer. In a useful embodiment, the optical layers 20, 22, 24, 26, 28, and 30 preferably include a light guide, an image generating device, such as a liquid crystal (such as a TFT LC) display, at least! A polarizer is basically used for absorption, and a variety of additional films ' which include diffusers, reflective polarizers, and other brightness enhancement films ' are used to create a viewable display. For example, the first optical layer 20 may include a reflector, followed by a light guide, followed by a diffuser, a reflective polarizer, a protective cover film, and other brightness enhancement films, and a light shutter device such as a liquid crystal The display is based on known display design principles. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page) ---- Order --------- Line ', 4 63 05 9 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention (5) One purpose of the mask is to prevent the viewer from perceiving that the light source is close to the light source, or that multiple light sources or reflective surfaces are coupled to the light guide. Glowing area. Therefore, the light guide is configured to cover areas where unwanted brightness is present. The mask is preferably placed on the major surface closest to the light guide, so both polarized light rays near the mask can be recycled. In other useful embodiments, the reticle 110 can be placed on any optical element between the light guide and a shutter layer or image generating device, preferably on the major surface closest to the light guide. Fig. 3 shows an example of a form of optical layer 28 including an example of a reflective mask. A part of the optical layer 28 is covered by a reflective mask 110, which has an inner edge 101 and an outer edge 102. The outer edge 102 can be regarded as the distance between the mask and the optical layer 28. The farthest part of the center "In a specific embodiment, the material layer includes an optical film with a selected geometry of one circumference, wherein an edge portion covered by the photomask is connected to at least part of the optical layer The perimeters overlap. The reflective mask may be uniform in density, or its reflectivity may gradually change from the outer edge 102 to the inner edge 101. In a preferred embodiment of the present invention, the optical layer 28 includes a reflective polarizer. However, it must be understood that the optical layer 28 may include any suitable optical layer form. Other optical materials that can be used with this mask include prismatic films, such as brightness enhancement films, whose trademarks are BEF, curved or large diffusers produced by 3M Company of St. Paul, Minnesota, USA. The cover sheet can be Clear or slightly diffused, or a dichroic polarizer. In the case of a reflective polarizer, any useful polarizer element can be used to transmit any required polarized light. Basically, the reflective polarizing element -8-This paper size applies to China National Standard (CNS) A4 (210 X 297 public love) (Please read the precautions on the back before filling this page)
J 訂---------線. -n If i vt n n t— at ( n I < A7 4 63 05 9 B7_________ 五、發明說明（6 ) 傳送一種偏光狀態的光線，並反射不同偏光狀態的光線。 用於達成這些功能的材料及結構皆可改變。根據該光學薄 膜的材料及結構，該名詞“偏光狀態”可表示例如直線，圓 形，及橢圓形偏光狀態。 適當的反射偏光元件範例包含多層反射偏光器，連續/分 散相位反射偏光器，雙色反射偏光器（其可視需要來與一四 分之一波形板相結合），及線格捕偏光器。一般而言，多層 反射偏光器及雙色反射偏光器爲鏡面反射器，而連續/分敷 相位反射偏光器爲擴散反射器，雖然這些特性並非通用（參 見例如在美國專利編號5, 867, 316中所提出的擴散多層反射 偏光器）。此所示的反射偏光元件的表列並不表示其爲適當 反射偏光元件的所有的表列。任何反射偏光器，其最好是 傳送具有一種偏光的光線，並最好反射具有一第二偏光的 光線，皆可使用。 多層反射偏光器及連績/分散相位反射偏光器皆根據至少 兩個不同材料之間的折射差異的指示來選擇性地反射一個 偏光方向的光線，其係正傳送一正交偏光方向的光線。適 當的擴散反射偏光器包含連績/分散相位反射偏光器，其由 美國專利編號5, 825,543及5,783, 120中所提出，在此引用做 爲參考，以及在美國專利編號5, 867, 316中所提出的該擴散 式反射多層偏光器’亦在此引用做爲參考。其它適當的擴 散反射偏光器係揭示於美國專利編號5,751 388，其在此引 用做爲參考。 雙色反射偏光器係揭示於美國專利編號5,793,456，美國 本紙張尺度適用中國國家標準（α^)Α4規格（210 x 297 ---- f請先閱讀背面之注意事項再填寫本頁) w - ill· —--訂---------'^入 經濟部智慧財產局員工消費合作社印製 經濟部智慧財產局員工消費合作社印製 4 63 〇5 9 A7 _B7 _ 五、發明說明（7 ) 專利編號5, 506,704，及美國專利編號5,691，789，皆在此引 用做為參考。一種範例雙色反射偏光器係由E. Merck & Co 所生產商標為TRANSMAX™ C線格柵偏光器係揭示於例如 PCT編號WO 94/11766，在此引用做為參考。 說明性多層反射偏光器係揭示於例如PCT編號 WO95/ 17303 ； W095/17692 ； W095/17699 ； W096/19347 ； 及WO/9S>/36262，及美國專利申請編號〇9/399, 53 1，皆在此 引用做為參考。其它反射多層偏光器則揭示於例如美國專 利編號5,486,949 ’ 5,612,820，5,882,774，其皆在此引用做 為參考。一種商用形式的多層反射偏光器係由美國 Minnesota，St· Paul的3M公司所生產的雙重亮度增進膜 (DBEF)。 此處所使用的反射偏光器可做為一範例來說明製造及使 用本發明的光學薄膜的結構及方法。此處所揭示的結構， 方法及技術皆可採用，並應用到其它形式的光學薄膜。該 反射偏光器或其它光學薄膜可包含額外的疊層或塗層來為 取終使用者所需要的薄膜的光學特性進行修正。舉例而 言’該反射偏光器可包含一吸收性偏光器疊層，例如一雙 色性偏光器，如在W095/17691及WO99/36813中所提出，在 此引用做為參考。此外，該反射偏光器可包含一擴散層， 如美國專利編號5,825,542，及美國專利申請編號 09/399531，在此引用做為參考。其它適當的疊層及塗層可 見於W097/01440中，其内容在此引用做為參考。 在本發明的一較佳具體實施例中，該光罩係直接地應用 到一反射偏光器或其它光學層。該光罩較佳地是具有一光 • 10- 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公爱） {請先閲讀背面之注意事項再填寫本頁) ----- ---- 訂---------線. Α7 Β7 五、發明說明（8 ) 學密度，其減弱了該光罩的區域中可見光的傳輸，來移除 不想要的亮點。舉例而言，該光罩較佳地是能夠高度地反 射可見光。另外，該光罩可具有一非恆定的光學密度。在 —較佳具體實施例中，該外緣102呈現出小於約25%的光學 傳輸，然而該光罩的該内緣101較佳地是呈現出大於約50% 的傳輸，而可移除一明確邊緣的外觀。 圖4所示爲應用到一光學層底部的一反射光罩。該光學層 400代表任何在該光閘裝置及該光導之間的複數個光學層， 而將該光學層400的頂部放置在位於朝向一顯示器。在圖4 的範例中，一反射光罩410係固定於該光學層400的底部上 的邊緣411。該反射光罩410包含一反射面412及一非反射面 415。箭頭420指出由該光源或該光導组件的其它部份（圖中 未示）。箭頭422代表由該反射面412所反射的光線。在該光 罩使用一薄膜或箔於該光軍的場合，該非反射侧415可包含 一黏接層，其與被覆蓋的該光學層的材料相容。該黏接層 本身的非反射性，或其可與相對於該光軍的該反射面的一 獨立非反射層相結合。 圖5所示爲一反射光罩應用到一光學層頂部的一範例之侧 視圖。該光學層500代表任何在該光閘裝置與該光導之間的 複數個光學層’而該光學層500的頂部則朝向一顯示器的可 觀視侧。在圖5的範例中，一反射光罩51 〇係固定於該光學 層500的頂部上的邊緣511。該反射光罩510包含一反射表面 512及一非反射表面515。箭頭520表示光線是由該光源或該 光導組件的其它部份（未示出）發出。虛線箭頭522則代表由 -11 - 本紙張尺度適用中國國家標準（CNS)A4規格（210 κ 297公楚） (請先閱讀背面之注意事項再填窝本頁) ---訂---------線· 經濟部智慧財產局員工消費合作社印製 4 63 05 9 A7 B7 五、發明說明（9 ) 該反射面5 12所反射的光線。 現在請參考圖6A，在另一具體實施例中，一放置在一薄 膜層600上的光罩可在面對一光導的一侧具有一反射層 601，而在面對觀视者的該侧面具有非反射性或吸收性層 602。在此架構中，由周圍光線對該光罩的反射表面的反射 所造成的亮點，將可大致消除。該光罩的反射及非反射層 可以運用到一光導组件中的相同薄膜。該光罩的反射及非 反射層可實際上具有相同的尺寸，除非有一個是垂直於其 它的光罩，也可能是如果兩個疊層具有相同的範圍。根據 包含在一光導組件中的元件特性，反射性及非反射性層組 合的一層的尺寸將比其它層要大，而可降低不想姜的光學 效應。 圖6B所示爲應用到一光學層616相同侧面的一反射光罩 612及非反射光罩614的一範例之側視圖。該反射光罩612面 對著該光導，而該非反射光罩則面對觀視者。 現在請參考圖7，所示爲應用到一光導組件700的不同光 學層的另一種反射性及非反射性光罩的範例之展開側视 圖。一反射光罩層701可被應用到一較接近於該光導706的 一薄膜704，而一非反射或吸收性光軍層708則應用到另一 個較接近於該影像產生裝置的薄膜71〇。舉例而言，一非反 射光罩層可直接地應用到一雙色吸收式偏光器的主要表面 之一 ’其通常是直接黏結到該影像產生裝置的背面上，而 —反射光罩層則可應用到非常靠近該光導的一擴散器薄膜 或反射偏光器薄膜。 -12 - 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閲讀背面之注ί項再填寫本頁) 'V-----^---訂---------線. 經濟部智慧財產局員工消費合作社印製 A7 4 63 059 五、發明說明（1〇 當應用到相同的薄膜時，該反射性及非反射性層皆可應 用到一光學薄膜層的相同主要表面，或其可應用到該光學 薄膜層的相對的主要表面。不論是應用到相同的至要表面 或是相同光學薄膜層的相對主要表面，該反射層較佳地是 位在較接近於該光導的位置，而該非反射層則位在較接近 於該影像產生裝置的位置，因此而較接近於觀視者及任何 的周圍光線來源〇當該光罩的該反射層及非反射層係位在 該光導组件中不同的光學薄膜層時，其可分別位在其光學 薄膜層的主要表面上，但較佳地是使該反射層位在較接近 於該光導的位置，而該非反射層則位在較接近於觀視者的 位置。 在一些具體實施例中，該光罩可不應用在該反射偏光器 的整個周界上或其它的光學層上，但可僅應用在該光源的 附近。該光罩的寬度係根據許多參數而定，最重要的是該 光源的強度。當由該光源發出的光線有效地耦合於該光導 中’該光罩的寬度即可爲非常地小，例如小於1 mm。而當 該光源與光導的耦合性不高時，該光罩的寬度則約在1 mm 左右，或是更寬。 對於高解析度的顯示器而言，較佳地是該光罩不會有色 彩的明顯改變。因此，在該光軍傳送光線的區域中，該光 罩僅呈現些微的中灰色。在CIE色彩中，dx及dy的絕對値必 須小於0.1左右。 在此處必須瞭解到，該反射光罩的反射面可利用任何適 當的鏡面或擴散反射材料製成。鏡面反射材料最好是包含 -13- 本紙張尺度適用中國國家標準（CNS)A4規格（21〇 X 297公爱） (/)-----K---訂---------線. (請先閲讀背面之注意事項再填寫本頁) V. 經濟部智慧財產局負工消費合作社印製 ^^3〇59 A7 _____B7 五、發明說明（11 ) 一金屬化塗層’一鏡面塗層，一金屬薄膜，一多層鏡面薄 膜，一金屬化塗料及金屬化帶。也可使用金屬箔，其包含 的金屬像是銀’紹’鎳’及其它已知的金屬與合金β擴散 反射材料也包含一擴散披覆反射多層鏡面膜，白色塗料， 微空洞薄膜，多相位薄膜’及同等的擴散反射材料。該反 射光罩的應用可使用任何習用的披覆技術，例如疊層，濺 鍍，塗漆等等，或其可使用一適當的黏著劑來應用。在一 些應用當中’其有需要使該光罩較厚，使得其可最爲該光 導組件中薄膜之間的一間隔層，用以防止在處理或組裝期 間的磨損或破壞，並消除Newton環，並藉由在該光導组件 中加入光學薄膜層之間的一空氣介面來防止濕氣。當該光 罩依此方式設計，其較佳地是選擇光罩材料能夠具有足夠 的彈力或是彈性體，其可緩衝在該光導組件中相當易碎的 薄膜。藉由該光罩的選擇厚度及配置，其有可能來除去一 個或多個保護覆蓋片’因此而降低了該光導组件的厚度。 {請先閱讀背面之注杳？事項再填寫本頁) / X-----r---訂·--------線‘ 經濟部智慧財產局員工消費合作社印製 -14- 本紙張尺度適用中國國家標準（CfJS)A4規格（210 x 297公釐）J order --------- line. -N If i vt nnt— at (n I < A7 4 63 05 9 B7_________ V. Description of the invention (6) Transmit light in a polarized state and reflect different polarized light State of light. Materials and structures used to achieve these functions can be changed. According to the material and structure of the optical film, the term "polarized state" can indicate, for example, straight, circular, and elliptical polarized states. Appropriate reflected polarized light Examples of components include multilayer reflective polarizers, continuous / dispersed phase reflective polarizers, two-color reflective polarizers (which can be combined with a quarter wave plate as needed), and line grid polarizers. In general, multilayer reflective polarizers Polarizers and two-color reflective polarizers are specular reflectors, while continuous / divided phase reflective polarizers are diffuse reflectors, although these characteristics are not universal (see, for example, the diffuse multilayer reflection proposed in US Patent No. 5,867,316 Polarizers). The list of reflective polarizers shown here is not meant to be a complete list of appropriate reflective polarizers. Any reflective polarizer, which is best transmitted with Any kind of polarized light, and preferably a light with a second polarized light, can be used. Both multilayer reflective polarizers and continuous / dispersion phase reflective polarizers are selected based on the indication of the difference in refraction between at least two different materials Reflects light in a polarizing direction, which is transmitting light in an orthogonal polarizing direction. Suitable diffuse reflection polarizers include continuous performance / dispersion phase reflection polarizers, which are described in US Patent Nos. 5,825,543 and 5,783,120. It is suggested that it be incorporated herein by reference, as well as the diffuse reflective multilayer polarizer 'proposed in US Patent No. 5,867,316, which is also incorporated herein by reference. Other suitable diffuse reflective polarizers are disclosed in U.S. Patent No. 5,751 388, which is incorporated herein by reference. The two-color reflective polarizer is disclosed in U.S. Patent No. 5,793,456. The paper size in the United States applies the Chinese National Standard (α ^) Α4 (210 x 297 ---- f Please (Please read the notes on the back before filling this page) w-ill · ———— Order --------- '^ Enter the Intellectual Property Bureau of the Ministry of Economic Affairs Employee Cooperatives Print the wisdom of the Ministry of Economic Affairs Printed by the Bureau of Industry and Consumer Cooperatives 4 63 〇5 9 A7 _B7 _ V. Description of Invention (7) Patent No. 5,506,704, and US Patent No. 5,691,789, all of which are hereby incorporated by reference. An example two-color reflective polarizer A TRAXMAX ™ C-line grille polarizer manufactured by E. Merck & Co is disclosed, for example, in PCT number WO 94/11766, which is incorporated herein by reference. An illustrative multilayer reflective polarizer is disclosed in, for example, the PCT number. WO95 / 17303; W095 / 17692; W095 / 17699; W096 / 19347; and WO / 9S > / 36262, and U.S. Patent Application No. 09/399, 53 1 are hereby incorporated by reference. Other reflective multilayer polarizers are disclosed in, for example, U.S. Patent Nos. 5,486,949 '5,612,820, 5,882,774, all of which are incorporated herein by reference. A commercial form of multilayer reflective polarizer is a dual brightness enhancement film (DBEF) produced by 3M Company, St. Paul, Minnesota, USA. The reflective polarizer used herein can be used as an example to explain the structure and method of manufacturing and using the optical film of the present invention. The structures, methods, and techniques disclosed herein can be adopted and applied to other forms of optical films. The reflective polarizer or other optical film may include additional laminates or coatings to modify the optical characteristics of the film required by the end user. By way of example, the reflective polarizer may include an absorptive polarizer stack, such as a dichroic polarizer, as proposed in W095 / 17691 and WO99 / 36813, which are incorporated herein by reference. In addition, the reflective polarizer may include a diffusing layer, such as US Patent No. 5,825,542 and US Patent Application No. 09/399531, which are incorporated herein by reference. Other suitable laminations and coatings can be found in W097 / 01440, the contents of which are incorporated herein by reference. In a preferred embodiment of the invention, the mask is applied directly to a reflective polarizer or other optical layer. The photomask preferably has a light • 10- This paper size is applicable to China National Standard (CNS) A4 specifications (210 X 297 public love) {Please read the precautions on the back before filling this page) ----- ---- Order --------- line. Α7 Β7 V. Description of the invention (8) The scientific density reduces the transmission of visible light in the area of the photomask to remove unwanted bright spots. For example, the mask is preferably capable of highly reflecting visible light. In addition, the photomask may have a non-constant optical density. In a preferred embodiment, the outer edge 102 exhibits less than about 25% optical transmission, whereas the inner edge 101 of the photomask preferably exhibits greater than about 50% transmission, and one can be removed. Clear appearance of edges. Figure 4 shows a reflective mask applied to the bottom of an optical layer. The optical layer 400 represents any of a plurality of optical layers between the shutter device and the light guide, and the top of the optical layer 400 is placed facing a display. In the example of FIG. 4, a reflective mask 410 is fixed to an edge 411 on the bottom of the optical layer 400. The reflective mask 410 includes a reflective surface 412 and a non-reflective surface 415. Arrow 420 indicates that the light source or other parts of the light guide assembly (not shown). The arrow 422 represents the light reflected by the reflecting surface 412. Where the photomask uses a film or foil for the optical army, the non-reflective side 415 may include an adhesive layer that is compatible with the material of the optical layer being covered. The adhesive layer itself is non-reflective, or it may be combined with an independent non-reflective layer with respect to the reflective surface of the light army. Figure 5 shows a side view of an example where a reflective mask is applied on top of an optical layer. The optical layer 500 represents any of a plurality of optical layers' between the shutter device and the light guide, and the top of the optical layer 500 faces the visible side of a display. In the example of FIG. 5, a reflective mask 51 is fixed to an edge 511 on the top of the optical layer 500. The reflective mask 510 includes a reflective surface 512 and a non-reflective surface 515. Arrow 520 indicates that the light is emitted by the light source or other parts (not shown) of the light guide assembly. The dashed arrow 522 stands for -11-This paper size applies the Chinese National Standard (CNS) A4 specification (210 κ 297 Gongchu) (Please read the precautions on the back before filling this page) --- Order ---- ----- Line · Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 63 05 9 A7 B7 V. Description of the invention (9) The light reflected by the reflecting surface 5 12. Referring now to FIG. 6A, in another embodiment, a photomask placed on a thin film layer 600 may have a reflective layer 601 on the side facing a light guide, and the side facing the viewer It has a non-reflective or absorptive layer 602. In this architecture, bright spots caused by the reflection of ambient light on the reflective surface of the reticle can be substantially eliminated. The reflective and non-reflective layers of the mask can be applied to the same film in a light guide assembly. The reflective and non-reflective layers of the reticle may actually have the same dimensions, unless one is perpendicular to the other reticle, or if the two stacks have the same range. Depending on the characteristics of the elements contained in a light guide assembly, the size of one layer of the combination of reflective and non-reflective layers will be larger than the other layers, reducing the optical effect of unwanted ginger. FIG. 6B shows a side view of an example of a reflective mask 612 and a non-reflective mask 614 applied to the same side of an optical layer 616. The reflective mask 612 faces the light guide, and the non-reflective mask faces the viewer. Referring now to FIG. 7, an expanded side view of an example of another reflective and non-reflective mask applied to different optical layers of a light guide assembly 700 is shown. A reflective mask layer 701 may be applied to a film 704 closer to the light guide 706, and a non-reflective or absorbent light military layer 708 may be applied to another film 71 closer to the image generating device. For example, a non-reflective mask layer can be directly applied to one of the main surfaces of a two-color absorption polarizer, which is usually directly bonded to the back of the image generating device, and a reflective mask layer can be applied. To a diffuser film or reflective polarizer film very close to the light guide. -12-The size of this paper applies to Chinese National Standard (CNS) A4 (210 X 297 mm) (Please read the note on the back before filling this page) 'V ----- ^ --- Order- ------- line. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 4 63 059 V. Description of the invention (10 When applied to the same film, both the reflective and non-reflective layers can be applied to The same major surface of an optical film layer, or the opposite major surface thereof that can be applied to the optical film layer. Whether it is applied to the same major surface or the opposite major surface of the same optical film layer, the reflective layer is preferably It is located closer to the light guide, and the non-reflective layer is located closer to the image generating device, so it is closer to the viewer and any surrounding light source. When the reflection of the mask is When the layer and the non-reflective layer are located in different optical film layers in the light guide component, they may be respectively located on the main surfaces of the optical film layer, but it is preferable to make the reflective layer closer to the light guide. And the non-reflective layer is closer to the viewer In some specific embodiments, the mask may not be applied on the entire perimeter of the reflective polarizer or other optical layers, but may be applied only near the light source. The width of the mask is based on many Depending on the parameters, the most important thing is the intensity of the light source. When the light emitted by the light source is effectively coupled to the light guide, the width of the mask can be very small, such as less than 1 mm. And when the light source and the When the coupling of the light guide is not high, the width of the mask is about 1 mm or wider. For high-resolution displays, it is preferable that the mask does not have a significant change in color. Therefore In the area where the light army transmits light, the mask only shows a slight medium gray. In CIE colors, the absolute 値 of dx and dy must be less than about 0.1. It must be understood here that the reflection of the reflective mask The surface can be made of any appropriate specular or diffuse reflective material. The specular reflective material preferably contains -13- This paper size applies to China National Standard (CNS) A4 specifications (21〇X 297 public love) (/) --- --K --- Order --------- line. (Please Read the notes on the back and fill in this page) V. Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs ^^ 3〇59 A7 _____B7 V. Description of the invention (11) A metallized coating, a mirror coating, a metal Film, a multilayer mirror film, a metallized coating and metallized tape. Metal foils can also be used, which contain metals such as silver 'Shao' nickel and other known metals and alloys. Β-diffusive reflective materials also include a Diffusion coating reflective multilayer mirror film, white paint, micro-cavity film, multi-phase film 'and equivalent diffuse reflection materials. The application of this reflective mask can use any conventional coating technology, such as lamination, sputtering, painting Etc., or it can be applied using an appropriate adhesive. In some applications, 'it is necessary to make the mask thicker so that it can be used as a spacer layer between the films in the light guide assembly to prevent wear or damage during processing or assembly, and to eliminate Newton rings, An air interface between the optical film layers is added to the light guide assembly to prevent moisture. When the photomask is designed in this way, it is preferable to select a photomask material that has sufficient elasticity or elastomer, which can buffer the relatively fragile film in the light guide assembly. By selecting the thickness and configuration of the photomask, it is possible to remove one or more protective cover sheets' and thus reduce the thickness of the light guide assembly. {Please read the note on the back? Please fill in this page again for matters) / X ----- r --- Order · -------- line 'Printed by the Consumers' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs -14- This paper size applies to Chinese national standards ( CfJS) A4 (210 x 297 mm)