1240144 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種光學裝置’特別關於一種應用於組 成背投螢幕之光學裝置，以消除在螢幕上造成視覺不舒服 之干涉紋(Moir6)現象。 【先前技術】 隨著HDTV與DVD-Player的普及，以及投影顯示器 在光學技術上的發展愈趨成熟，大尺寸電視影像愈來愈受 到市場的重視以及消費者的青睞。 依據投影顯示方式之不同，可以分為背投式 (Real-Projection)以及前投式（Front-Projection)兩種，主要 依據觀賞者的眼睛是從螢幕哪個方向觀看到影像，從榮幕 剞方看到稱之為前投式，反之，從螢幕後方看到則稱之為 背投式。現今’由於背投式電視機具有無輻射線、高清晰 度的大螢幕顯示功能、價格低等優點，因此逐漸成為睛買 電視的消費主流。 心請參照圖1卿，習知之背投f幕1包括有-菲淫耳 = 叫u及—柱狀透鏡（域如 為一聚焦透鏡，其係主要將峨 /、w杈射之入射光線，偏折至垂 互相平行離開菲涅耳透铲η 、 ϋ上而使光綉 好的運用，兄，而使得視域内的光線能做良 好的連用，進而提昇影像的亮 則用以提供影像之成像。 …：X ’而柱狀透鏡1: 1240144 柱狀透鏡12係具有複數個柱狀凸部121設置於入光 面’以及複數個黑T條紋(BlackStripes)122設置於出光 面。如圖2所示，經由離開菲涅耳透鏡u之平行光線2〇 垂直入射柱狀凸部121後，光線20將在柱狀透鏡12中被 聚焦而後由出光面射出，位於出光面之黑帶條紋122則係 分別精確地覆蓋在出光面相對於柱狀凸部121的非聚焦部 123，且黑帶條紋122係以光吸收材料構成，用以吸收非 垂直入射進入柱狀透鏡12的雜散光線以及來自觀看者一 方的環境光，進而可降低外部光線之影響，提高晝面之對 比度。 黑帶條紋122的製作，係如產業界所熟知，先於柱狀 透鏡12之出光面，塗佈適當厚度之光阻，接著再利用光 源知、射柱狀凸121，猎由柱狀凸部121將光源之光線2〇 規則性地聚焦並投射於光阻上，進行正顯影（或是負顯影） 等之製程步驟，而產生複數個黑帶條紋122，由於柱狀凸 部121為規則排列’且鬲度曲率大致相同，因此形成規則 排列且等寬度之黑帶條紋122，由於黑帶條紋122規則之 間距，使得應用於投影顯示系統時容易造成光線的干涉現 象，而在視覺上產生俗稱的干涉紋(Moir6)現象，除了讓觀 看者產生不舒服之視覺外，此外也降低了整個晝面的品 質。 承上所述’當今背投螢幕仍具有改善的空間，因此如 何提供一耩消除在螢幕上造成視覺不舒服之干涉紋(MoiM) 現象之背投螢幕及其光學裝置實為當前重要的課題之一。 1240144 【發明内容】 有鑑於上述課題，本發明之目的為提供一種消除干涉 紋現象之背投螢幕及其光學裝置。 緣是，為達上述目的，依據本發明之光學裝置包含一 光學元件以及一光線吸收圖案層，其中，光學元件之一表 面係具有一柱狀凸部結構，且柱狀凸部結構係包含曲率參 數相異之一第一凸部與一第二凸部；光線吸收圖案層係具 有複數個光線吸收單元，且光線吸收圖案層係設置於相對 光學元件之柱狀凸部結構的另一表面之上。 為達上述目的，依據本發明之背投螢幕包含一第一光 學元件、一光線吸收圖案層以及一第二光學元件，其中， 第一光學元件之一表面係具有一柱狀凸部結構，柱狀凸部 結構係包含曲率參數相異之一第一凸部與一第二凸部；光 線吸收圖案層係具有複數個光線吸收單元，且光線吸收圖 案層係設置於相對光學元件之柱狀凸部結構的另一表面 之上；第二光學元件係鄰設於第一光學元件。 承上所述，因依據本發明之背投螢幕及其光學裝置係 利用一具有曲率參數相異之柱狀凸部結構的光學元件，由 於柱狀凸部結構的凸部曲率參數相異因此可使入射光線 改變規律性之聚焦位置，同時造成不等寬度之光線吸收單 元的光線吸收圖案層，因而使得以此光學裝置組合之背投 螢幕，藉由光線出光範圍的不規則變化，進而消除造成視 覺上不舒服之干涉紋現象。 1240144 【實施方式】 以下將參照相關_式’說明依據本發明較佳實施例之 月投螢幕及其光學裝置，其中相同的元件將以相同的參照 付號加以說明。 請參照圖3所乔，依據本發明較佳實施例之光學裝置 2係包含—光學元件21以及一光線吸收圖案層22。 光學元件21之/表面係具有一柱狀凸部結構，柱狀 凸部結構可將入射之彳行光線聚焦後進行成像作用，如圖 3所不，此杈狀凸部結構包含一第一凸部211與一第二凸 部212，且第一凸部211與第二凸部212之曲率參數係相 異。其中，光學元件21係可為一柱狀透鏡。 光線吸收圖案層22係設置於相對光學元件21之柱狀 凸部結構的另一表面之上，即相對於光學元件21之光入 射面21A的出光面21B上，承上所述，光線吸收圖案層 22係具有複數個光線吸收單元221，在製程中，光線吸收 圖案層22之形成係於相對光學元件21之出光面21B上塗 佈，或是負顯影之光阻，藉由光線的照射後，在光學 巾聚錢而散發出之光線，使受光祕光之光阻 …貝办而可移除（正顯影光 上（負顯影光阻），因而开影後仍附著於出光面21Β 成之圖案層，由於入射复數個光線吸收單元221構 私恶丄 I 任光學元件21 t之聚焦點P、p， 一 〆介τλ 国亦相異，故形成之光線吸收單 兀211之寬度亦不相同。 承上戶/f i f⑽狀凸部結構之凸部的曲率參數相 1240144 異，因此，具該結構之光學裝置2用以在成像過程中，藉 由光線入射後聚焦點位置的變化而消除因為出光範圍之 間距一致所導致的干涉紋現象。 又，如圖4所示，依據本發明較佳實施例之光學裝置 2的柱狀凸部結構更包含一第三凸部213，其之曲率參數 係相異於第一凸部211或第二凸部212之曲率參數，用以 造成光線出光範圍的變化，以達消除干涉紋效應的目的， 當然，在本實施例中，光學裝置2更可包含曲率參數相異 於弟凸部211或弟一凸部212之曲率參數的第四凸部、 第五凸部…·等等之應用。其中，柱狀凸部結構之該等凸部 211、212、213的曲率參數變化係可以具有規律性，例如 2倍、3倍、6倍等之規律變化，抑或可以是不具規律變化 之組合。 在本實施例中，該等凸部211、212、213的曲率參數 了以依據光入射面21A非位於同一基準水平線上做變化 (如圖3與4所示），亦可以依據光入射面41A位於同一基 準水平線上做曲率參數的變化（如圖5所示），俾使入射光 線聚焦之聚焦點不同，進而有出光範圍不同的變化。 承上所述，依據本發明較佳實施例之光學裝置2更包 含一光擴散層23，其係設置於相對該光學元件21之柱狀 凸部結構的另一表面之上，然，其設置位置，可以形成於 光線吸收圖案層22上且覆蓋之(如圖6A所示），抑或可以 形成於光學元件21與光線吸收圖案層22之間（如圖6B所 不）’另外，光學裝置2亦可更包含一抗反射層24，其亦 1240144 可設置於光線吸收圖案層22之上，如上所述，抗反射層 24之設置位置，可以形成於光線吸收圖案層22上且覆蓋 之（如圖6C所示），抑或可以形成於光學元件21與光線吸 收圖案層22之間（如圖6D所示），此外，更可以是光擴散 層23以及抗反射層24互相組合形成於光線吸收圖案層22 上（如圖6E所示）或是光學元件21與光線吸收圖案層22之 間，以此些結構使此光學裝置2應用於背投螢幕時，能夠 達到增加視角與光線強度的目的，進而提高背投螢幕之品 質。 又，如圖7所示，在本實施例中，光學裝置2之光學 元件21内可填入光擴散微粒，使光學裝置2除了可以增 加視角外，更可以使影像亮度更具均勻性。 再請參考圖8所示，依據本發明較佳實施例之背投螢 幕3，包含一第一光學元件31、一光線吸收圖案層32與 一第二光學元件30。 第一光學元件31係為上述之光學元件21，其結構、 組成與特徵係如前述，故不再贅述，而在本實施例中，第 二光學元件30係鄰設於第一光學元件31，用以與上述之 第一光學元件31組合形成背投螢幕3，其中，第二光學元 件30係為菲涅耳透鏡（Fresnel Lens)，其係將光源來之光 線聚集後偏折光線，使離開菲涅耳透鏡之光線成為互相平 行之光線以入射進入柱狀透鏡，而進行成像。 綜上所述，依據本發明之較佳實施例之背投螢幕及其 光學裝置，係利用光學元件（第一光學元件）具有不同曲率 1240144 參數之凸部組合的柱狀凸部結構，俾使光線入射後可以產 生不同位置之聚焦點，進而使光線的出光範圍有不規則之 變化，將此光學裝置應用於背投螢幕，來達到消除讓視覺 不舒服感受的干涉紋效應之目的，進而提高背投螢幕之品 質。 以上所述僅為舉例性，而非為限制性者。任何未脫離 本發明之精神與範疇，而對其進行之等效修改或變更，均 應包含於後附之申請專利範圍中。 【圖式簡單說明】 圖1為一顯示習知背投螢幕之立體示意圖； 圖2為一顯示習知背投螢幕之剖面示意圖； 圖3為一顯示依本發明較佳實施例之光學裝置的剖面 不意圖， 圖4為一顯示依本發明較佳實施例之另一光學裝置的 剖面不意圖， 圖5為一顯示依本發明另一較佳實施例之光學裝置的 不意圖， 圖6A〜6E為一顯示依本發明較佳實施例之又一光學 裝置的一組剖面示意圖； 圖7為一顯示依本發明較佳實施例之再一光學裝置的 剖面示意圖；以及 圖8為一顯示依本發明較佳實施例之背投螢幕的示意 圖0 11 1240144 元件符號說明： 1 背投螢幕 11 菲涅耳透鏡 12 柱狀透鏡 121 柱狀凸部 122 黑帶條紋 123 非聚焦部 2 光學裝置 20 光線 21 光學元件 21A 光入射面 21B 出光面 211 第一凸部 212 第二凸部 213 第三凸部 22 光線吸收圖案層 221 光線吸收單元 P 聚焦點 P， 聚焦點 23 光擴散層 24 抗反射層 3 背投螢幕 30 第二光學元件 31 第一光學元件 12 12401441240144 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to an optical device ', and particularly to an optical device applied to a rear projection screen to eliminate the interference pattern (Moir6) that causes visual discomfort on the screen . [Previous Technology] With the popularization of HDTV and DVD-Player, and the development of optical technology of projection displays, the large-sized TV images are more and more valued by the market and consumers. According to the different projection display methods, it can be divided into two types: real-projection and front-projection. It is mainly based on which direction the viewer's eyes see the image from the screen. Seen as the front projection type, on the other hand, seen from behind the screen is called the rear projection type. Nowadays, as rear projection televisions have the advantages of radiation-free, high-definition large-screen display functions, and low prices, they have gradually become the mainstream consumer of televisions. Please refer to FIG. 1 for details. The rear projection f screen 1 of the conventional art includes -fielder lens = u and-lenticular lens (if the field is a focusing lens, it mainly emits incident light from E /, w branches, The deflection is perpendicular to leaving the Fresnel shovel η and 平行 parallel to each other to make good use of light embroidery, brother, so that the light in the field of view can be used well, and then the brightness of the image is enhanced to provide image imaging …: X 'and the lenticular lens 1: 1240144 The lenticular lens 12 has a plurality of cylindrical convex portions 121 disposed on the light incident surface' and a plurality of black T stripes (BlackStripes) 122 disposed on the light emitting surface. As shown in FIG. 2 It is shown that after the parallel light rays 20 leaving the Fresnel lens u enter the cylindrical convex portion 121 perpendicularly, the light rays 20 will be focused in the lenticular lens 12 and then emitted from the light emitting surface. The black stripe 122 on the light emitting surface is The non-focus portions 123 of the light-emitting surface opposite to the columnar convex portions 121 are accurately covered, and the black stripe 122 is made of a light absorbing material to absorb stray light that is not perpendicularly incident into the lenticular lens 12 and from the viewer. Ambient light, which reduces external light The effect of the line increases the contrast of the daytime surface. The production of the black stripe 122, as is well known in the industry, is applied to the light emitting surface of the lenticular lens 12 with a suitable thickness of photoresist, and then the light source and the beam are used. The convex projection 121 is formed by focusing on the light source 20 regularly by the columnar projection 121 and projecting it on the photoresist, and then performing positive or negative development steps to produce a plurality of black band stripes 122. ， Because the columnar convex portions 121 are regularly arranged and the degree of curvature is approximately the same, black stripes 122 of regular arrangement and equal width are formed. Due to the regular spacing of the black stripes 122, it is easy to cause light when applied to a projection display system. The interference phenomenon, which is commonly known as the interference pattern (Moir6) phenomenon, not only makes the viewer uncomfortable, but also reduces the quality of the entire daytime. According to the above description, today ’s rear projection screens still have There is room for improvement, so how to provide a rear-projection screen and its optical device that eliminate the moiM phenomenon that causes visual discomfort on the screen is really one of the important issues at present. 12 40144 [Summary of the Invention] In view of the above problems, an object of the present invention is to provide a rear projection screen and an optical device for eliminating the interference fringes phenomenon. In order to achieve the above object, the optical device according to the present invention includes an optical element and an optical device. A light absorption pattern layer, wherein one surface of the optical element has a columnar convex structure, and the columnar convex structure includes a first convex portion and a second convex portion having different curvature parameters; the light absorption pattern layer It has a plurality of light absorbing units, and the light absorbing pattern layer is disposed on the other surface of the columnar convex structure of the opposite optical element. In order to achieve the above object, the rear projection screen according to the present invention includes a first optical element A light absorbing pattern layer and a second optical element, wherein one surface of the first optical element has a columnar convex structure, and the columnar convex structure includes a first convex portion and a first convex portion having different curvature parameters; The second convex portion; the light absorbing pattern layer has a plurality of light absorbing units, and the light absorbing pattern layer is provided on the columnar convex portion of the opposite optical element On the other surface of the structure; a second optical element disposed adjacent to the first optical system element. As mentioned above, since the rear projection screen and the optical device thereof according to the present invention use an optical element having a cylindrical convex structure with different curvature parameters, the convex curvature parameters of the cylindrical convex structure are different, so it can be used. The incident light changes the regular focusing position, and at the same time, the light absorption pattern layers of the light absorption units of unequal width are caused, so that the rear projection screen combined with this optical device can eliminate the irregularity of the light output range by the irregular changes. Visually uncomfortable interference pattern. 1240144 [Embodiment] The following will describe a monthly projection screen and its optical device according to a preferred embodiment of the present invention with reference to the related formula. The same components will be described with the same reference numbers. Referring to FIG. 3, the optical device 2 according to the preferred embodiment of the present invention includes an optical element 21 and a light absorbing pattern layer 22. The surface of the optical element 21 has a columnar convex structure. The columnar convex structure can focus incident incident light rays for imaging. As shown in FIG. 3, the branched convex structure includes a first convex structure. The portion 211 and a second convex portion 212, and the curvature parameters of the first convex portion 211 and the second convex portion 212 are different. The optical element 21 may be a lenticular lens. The light absorption pattern layer 22 is disposed on the other surface of the columnar convex portion structure opposite to the optical element 21, that is, on the light exit surface 21B opposite to the light incident surface 21A of the optical element 21. As described above, the light absorption pattern The layer 22 has a plurality of light absorbing units 221. In the manufacturing process, the formation of the light absorbing pattern layer 22 is coated on the light emitting surface 21B of the opposite optical element 21, or a negative photoresist is developed. After the light is irradiated, The light emitted by gathering money in the optical towel makes the photoresistance of the secret light ... can be removed (on the positive developing light (negative developing photoresist)), so it remains attached to the light emitting surface 21B after the film is opened. In the pattern layer, since a plurality of light absorbing units 221 are incident on the optical element 21, the focal points P and p of the optical element 21 t are different from each other, so the widths of the light absorbing units 211 formed are also different. The curvature parameters of the convex part of the bearing / fi f-shaped convex part structure are different from 1240144. Therefore, the optical device 2 with the structure is used to eliminate the change in the focus point position after the light is incident during the imaging process. Out of light range The interference fringes caused by the same distance. As shown in FIG. 4, the cylindrical convex structure of the optical device 2 according to the preferred embodiment of the present invention further includes a third convex portion 213, and the curvature parameters thereof are different. The curvature parameter of the first convex portion 211 or the second convex portion 212 is used to cause a change in the light output range to eliminate the interference fringes effect. Of course, in this embodiment, the optical device 2 may further include a curvature parameter Application of the fourth convex part, the fifth convex part, etc. which are different from the curvature parameters of the young convex part 211 or the first convex part 212. Among them, the convex parts 211, 212, 213 of the columnar convex structure The curvature parameter change can be regular, such as regular changes of 2 times, 3 times, and 6 times, or a combination of irregular changes. In this embodiment, the curvatures of the convex portions 211, 212, and 213 The parameters are changed according to whether the light incident surface 21A is not on the same reference horizontal line (as shown in Figs. 3 and 4), or the curvature parameter can be changed according to the light incident surface 41A on the same reference horizontal line (as shown in Fig. 5). , 聚焦 Focus the incident light to focus Different points cause further changes in the light output range. As mentioned above, the optical device 2 according to the preferred embodiment of the present invention further includes a light diffusion layer 23 that is disposed on the columnar convex structure of the optical element 21. Above the other surface, of course, its setting position can be formed on the light absorption pattern layer 22 and covered (as shown in FIG. 6A), or it can be formed between the optical element 21 and the light absorption pattern layer 22 (such as 6B)) In addition, the optical device 2 may further include an anti-reflection layer 24, and 1240144 may be disposed on the light absorption pattern layer 22. As described above, the position of the anti-reflection layer 24 may be formed on The light absorbing pattern layer 22 and covering it (as shown in FIG. 6C), or may be formed between the optical element 21 and the light absorbing pattern layer 22 (as shown in FIG. 6D). In addition, the light diffusing layer 23 and The anti-reflection layers 24 are combined with each other and formed on the light absorption pattern layer 22 (as shown in FIG. 6E) or between the optical element 21 and the light absorption pattern layer 22. With these structures, the optical device 2 is applied to a rear projection screen. ,were able Perspective and to increase the light intensity object, thus improving product quality of the projection screen. Also, as shown in FIG. 7, in this embodiment, the optical element 21 of the optical device 2 can be filled with light diffusing particles, so that the optical device 2 can increase the viewing angle and make the image brightness more uniform. Referring to FIG. 8 again, a rear projection screen 3 according to a preferred embodiment of the present invention includes a first optical element 31, a light absorbing pattern layer 32, and a second optical element 30. The first optical element 31 is the above-mentioned optical element 21, and its structure, composition and characteristics are as described above, so it will not be repeated here. In this embodiment, the second optical element 30 is adjacent to the first optical element 31. It is used to form the rear projection screen 3 in combination with the above-mentioned first optical element 31, wherein the second optical element 30 is a Fresnel Lens, which gathers the light from the light source and deflects the light to leave it. The light from the Fresnel lens becomes parallel to each other and enters the lenticular lens for imaging. To sum up, the rear projection screen and its optical device according to the preferred embodiment of the present invention utilize a columnar convex structure with a combination of convex portions having different curvatures of 1240144 parameters of the optical element (first optical element), so that After the light is incident, it can generate focal points in different positions, which will cause irregular changes in the light output range. This optical device is used in rear projection screens to eliminate the interference pattern effect that makes visually uncomfortable feelings, thereby improving The quality of the rear projection screen. The above description is exemplary only, and not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope of the attached patent application. [Brief description of the drawings] Fig. 1 is a schematic perspective view showing a conventional rear projection screen; Fig. 2 is a schematic sectional view showing a conventional rear projection screen; Fig. 3 is a schematic view showing an optical device according to a preferred embodiment of the present invention; The cross-section is not intended. FIG. 4 is a cross-sectional view illustrating another optical device according to a preferred embodiment of the present invention, and FIG. 5 is a schematic view illustrating an optical device according to another preferred embodiment of the present invention. 6E is a schematic cross-sectional view showing another optical device according to a preferred embodiment of the present invention; FIG. 7 is a schematic cross-sectional view showing another optical device according to a preferred embodiment of the present invention; Schematic diagram of the rear projection screen of the preferred embodiment of the present invention 0 11 1240144 Description of component symbols: 1 Rear projection screen 11 Fresnel lens 12 Cylindrical lens 121 Cylindrical convex portion 122 Black stripe 123 Unfocused portion 2 Optical device 20 Light 21 Optical element 21A Light incident surface 21B Light emitting surface 211 First convex portion 212 Second convex portion 213 Third convex portion 22 Light absorption pattern layer 221 Light absorption unit P Focus point P, Focus point 23 Light diffusing layer 24 Anti-reflection layer 3 Rear projection screen 30 Second optical element 31 First optical element 12 1240144
32 41A 光線吸收圖案層 光入射面32 41A Light absorption pattern layer Light incident surface
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