I263445wfd〇c/y 九、發明說明： 【發明所屬之技術頜域】 本發明是有關於/種顯示裝置及其顯示螢幕與顯示 螢幕的設計方法，且特別是有關於/種背投影顯示裝置及 其背投影顯示螢幕與背投影顯示螢幕的設計方法。 【先前技術】 習知背投影顯示裝置多被應用於家用電視、家庭電影 院等大尺寸顯示之場合。請參照圖1，習知背投影顯示裝 置100包括一螢幕110、〆光學引擎與一外殼130。其 中，光學引擎120配設於外殼130内，而螢幕110則配設 於外殼130的一開口 〇1處。光學引擎120所產生的影像 光束L1會先通過螢幕110,之後再到達使用者的眼睛而讓 觀賞者得以觀看影像。其中，為了降低背投影顯示裝置1〇〇 的厚度，通常影像光束L1會有較大的發散角度，因此勞 幕110必須具有將影像光束會聚的功能，俾使觀賞者在適 當的位置内皆能觀賞到影像。同時，螢幕1的品質更決 定了背投影顯示裝置1〇〇的顯示晝質。 請參照圖2，習知背投影顯示螢幕2〇〇是由一片菲涅 耳透鏡片（F職el lens shee御與—柱狀透鏡片（― lenSSheet)220所疊合而成。其中，菲沒耳透鏡片210是用 彡像光束，而柱狀透則22()則是用來調整水平與I263445wfd〇c/y IX. Description of the invention: [Technology of the invention] The present invention relates to a display device and a display method thereof for displaying a screen and a display screen, and more particularly to a rear projection display device and Its rear projection displays the design method of the screen and rear projection display screen. [Prior Art] Conventional rear projection display devices are often used in large-sized displays such as home televisions and home theaters. Referring to FIG. 1, the conventional rear projection display device 100 includes a screen 110, a 〆 optical engine and a housing 130. The optical engine 120 is disposed in the outer casing 130, and the screen 110 is disposed at an opening 〇1 of the outer casing 130. The image beam L1 generated by the optical engine 120 passes through the screen 110 and then reaches the user's eyes to allow the viewer to view the image. In order to reduce the thickness of the rear projection display device 1 , the image beam L1 usually has a large divergence angle, so the screen 110 must have the function of concentrating the image beam, so that the viewer can be in the proper position. Watch the image. At the same time, the quality of the screen 1 determines the display quality of the rear projection display device 1〇〇. Referring to FIG. 2, the conventional rear projection display screen 2 is formed by stacking a Fresnel lens sheet (F-el lens shee and lenticular lens sheet (―lenSSheet) 220. The lenticular lens sheet 210 is a beam of light, and the columnar lens 22 () is used to adjust the level and
Λ 取少）: 少） 1263445 1621 ltwf.doc/y 的顯示畫質低、落。料，菲科透鏡p1G的不連續面也 會造成部分影像光祕反射，進崎财投影_示事 顯Μ度。另外，菲科透鏡片210還存在價格昂貴 面間距受限於加工刀具、容易損毀且具有肉眼可見的 結構等缺點。再者，由於背投影顯示螢幕2〇〇必須由兩片 獨立的菲涅耳透鏡片210與柱狀透鏡片220組裝而成，因 此不僅需耗費組裝的人力與時間，且組裝後還可能存在此 才又影顯示螢幕200龜曲而不平整的問題。 【發明内容】 抑本發明的一目的就是在提供一種背投影顯示螢幕，利 用單一膜片整合聚光與視角調整功能，以達到防止鬼影、 間化製程及降低成本。 、 本發明的另一目的是提供一種背投影顯示裝置，其螢 幕利用單一膜片整合聚光與視角調整功能，以達 影、簡化製程及降低成本。 ^ 本發明提出一種背投影顯示螢幕，其包括一第一基板 以及一繞射光學元件層（diffraCtive 〇ptical demem㈣二。 弟基板具有一光入射面與相對於光入射面的一光出射 面。繞射光學元件層位於第一基板的光入射面上，用以會 聚通過繞射光學元件層之光束，並使其在水平與垂直方向 上以不，的發散角射出。，繞射光學元件層劃分為多個區 塊’而每一個區塊的厚度分佈函數為吣Μ， (”(又〇) —1) ψ(χ，少）=[00,少)]m〇d 乂〇， 12634始 1 twf.doc/y (/>(x,y) = J^CrXmYn j .{(m + /7)2 +rn + 3«} 其中，炝，β為每一個區塊之相位函數，xJ&y分別 :每-_塊以其巾4原點日㈣水平鱗值與垂直練 值，。為入射繞射光學元件層之光束的中心波長， . 繞射光學元件層對於所入射之光束的折射率，Ψ(χ，>0為沁二 • 除以後所得之餘數，每—個區塊的m、η與。,則為常數。 本發明另提出-種背投影顯示裝置，其包括一光學弓! 擎以及前述的背投影顯示螢幕。光學引擎用以提供一影像 光束’而影絲束是通過前itt投影顯㈣幕後投影至使 用者處。 在上述背投影顯示裝置與背投影顯示螢幕中，背投影 顯示螢幕可更包括-光吸收圖案層，其配置於第一基板的/ 光出射面上，用以阻擋雜散光通過光出射面。 -在上述背投影顯示裝置與背投影顯示螢幕中，背投影 顯示螢幕可更包括-第二基板，其具有一第一表面與相對 於第-表面的-第二表面。第二基板是以第一表面朝向第 基板而配置於光出射面旁。此外，第二基板的第一表面 可為光擴散面。另外，第二基板的第二表面可為防刮面。 在上述背投影顯示裝置與背投影顯示螢幕中，第一基 板之材質可為聚甲基丙烯酸甲酯(PMMA)或聚乙稀丙稀 (polyethylene propylene，pep)。 在上述背投影顯示裝置中，可更包括一外殼，其具有 7Λ Take less): Less) 1263445 1621 ltwf.doc/y The display quality is low and falling. Material, the discontinuous surface of the Fico lens p1G will also cause some of the image light reflection, into the Qiaki projection _ show the degree of visibility. In addition, the Fico lens sheet 210 has the disadvantages of expensive surface spacing limited by the processing tool, easy damage, and visible structure. Furthermore, since the rear projection display screen 2 must be assembled from two separate Fresnel lens sheets 210 and the lenticular lens sheet 220, it is not only necessary to labor and time for assembly, but also may exist after assembly. It also shows the problem that the screen 200 is not flat. SUMMARY OF THE INVENTION One object of the present invention is to provide a rear projection display screen, which utilizes a single diaphragm to integrate the concentrating and viewing angle adjustment functions to prevent ghosting, intervening processes, and cost reduction. Another object of the present invention is to provide a rear projection display device in which the screen utilizes a single diaphragm to integrate the concentrating and viewing angle adjustment functions for image formation, simplification of the process, and cost reduction. The present invention provides a rear projection display screen comprising a first substrate and a diffractive optical element layer. The substrate has a light incident surface and a light exit surface with respect to the light incident surface. The layer of the optical element is located on the light incident surface of the first substrate for concentrating the light beam passing through the layer of the diffractive optical element and emitting it at a divergence angle in the horizontal and vertical directions. For a plurality of blocks' and the thickness distribution function of each block is 吣Μ, ("(又 〇) -1) ψ (χ, less) = [00, less)] m〇d 乂〇, 12634 1 Twf.doc/y (/>(x,y) = J^CrXmYn j .{(m + /7)2 +rn + 3«} where 炝, β is the phase function of each block, xJ& y: Each -_ block is the horizontal scale value and the vertical value of the towel 4 origin (4). It is the center wavelength of the beam of the incident diffractive optical element layer. The diffraction of the diffractive optical element layer to the incident beam Rate, Ψ (χ, > 0 is 沁 2 • The remainder obtained after the remainder, m, η and ., for each block are constant. The present invention further proposes - The rear projection display device comprises an optical bow and the aforementioned rear projection display screen. The optical engine is used to provide an image beam 'the shadow bundle is projected to the user through the front IT projection (4) behind the scene. In the projection display device and the rear projection display screen, the rear projection display screen may further include a light absorption pattern layer disposed on the light exit surface of the first substrate to block stray light from passing through the light exit surface. In the projection display device and the rear projection display screen, the rear projection display screen may further include a second substrate having a first surface and a second surface opposite to the first surface. The second substrate is oriented toward the first surface The substrate is disposed beside the light exit surface. Further, the first surface of the second substrate may be a light diffusing surface. In addition, the second surface of the second substrate may be a scratch resistant surface. The rear projection display device and the rear projection display screen The material of the first substrate may be polymethyl methacrylate (PMMA) or polyethylene propylene (pep). In the above rear projection display device, one may further include Shell having 7
Kx,y) Ψ(χ，少） 1263445 16211twf.doc/y 一開口。其中，光學引擎配設於外殼内，而背投影顯示 幕配設於外殼之開口處。 ' 本电明再長：出一種背投影顯示螢幕的設計方法，其曰 先將位於一基板之一光入射面上的一繞射光學元件層書彳分 為多個區塊，然後依據光束在這些區塊之入射角、^二 散角與垂直發散角而決定這些區塊之厚度分佈函數，以^ 背投影顯示螢幕在水平與垂直方向上具有不同視角。 在上述背投影顯示螢幕的設計方法中，決定區塊之厚 度分佈函數的方法包括使用下列關係式： 子 Λ «Λ) -1) Χ¥(χ^) = [φ(χ,γ)]χηοάλ0 ^ = -XmYn 8 1263445 16211twf.doc/y 此，本發明之背投影顯示螢幕具有不需組裝、光穿透率優 於習知技術以及成本較低的優點。此外，本發明之背投影 顯示螢幕還具有無鬼影、無肉眼可見的加工痕跡以及高對 比的優點。 為讓本發明之上述和其他目的、特徵和優點能更明顯 易懂，下文特舉較佳實施例，並配合所附圖式，作詳細說 明如下。 【實施方式】 > 請參照圖3，本發明一實施例之背投影顯示裝置3〇〇 包括一外殼320、一光學引擎310以及一背投影顯示螢幕 400。其中外殼320用以固定光學引擎310與背投影顯示螢 幕400，並防止外界灰塵污染光學引擎310而降低背投影 顯示裝置300的顯示品質；而光學引擎310配設於外殼320 内，並可係依據外界所輸入的影像訊號而產生一影像光束 L2,並將影像光束L2投射至背投影顯示螢幕400;背投影 顯示螢幕400則配設於外殼320的一個開口 02處，影像 • 光束L2會先通過背投影顯示螢幕400後才投影至使用者 50處’讓使用者50得以透過背投影顯不螢幕400而觀看 影像。 請參照圖3與圖4,係本發明一實施例之背投影顯示營 幕400其包括一第一基板410以及一繞射光學元件層 420。第一基板410具有一光入射面S1與相對於光入射面 S1的一光出射面S2。繞射光學元件層420是位於第—基 板410的光入射面S1上’用以會聚通過繞射光學元件層 I263445twfd〇c/y 420的影像光束L2，並使影像光束L2在水平與垂 上以不同的發散角射出。其中，第一基板41〇之材質，向 聚曱基兩稀酸曱酯、聚乙稀丙烤或其他透光材質。=為 由於使用者在觀看背投影顯示裝置3〇〇所提供的影1， 有可月b使用的水平視角範圍較大而垂直視角 ^ 繞射光學元件層42_設計成讓影像 向上的發散角大於在垂直方向上的發散角為佳。 承上所述’繞射光學元件層420例如是在第—基板 的光入射面S1上加工而成的。舉例而言，繞射光土學元件 層420的加工方式例如是先形成一個母板(未繪示），再將 母板表面關案以熱壓、射出成形或其他移轉技術而轉移 至弟-基板4H)的光入射面S1上。母板的形成方式則可 採用雷射加工、電子束加工、微影綱製程、刀呈加工或 介Γ繞射光學元件層420的細部結構將於 在本實施例之背投影顯示螢幕4⑻中 畑兼具會聚影像光束L2 «及輕影像光 平14垂直方向上的發散角（亦即背投影顯示裝置在 ^平與f直方向上的可視角）等雙重功能，因此可取代習知 技術中非料透鏡片與柱狀透鏡片的組合。換言之，本實 t之背投影顯示螢幕400可避免菲沒耳透鏡片口所產生的 也2耗費人力與時間進行組裳，更不會有組裝後 °同時’單—膜片所構成的背投影顯 “ 可避免影像光束L2穿過雙層膜片所造成的 12634骀 1 ltwf.doc/y 光耗損，進而獲得較高的畫面亮度。當繞射光學元件層42〇 是經由加工精度較高的製作方式形成時，還可改善習知技 術中加工痕跡明顯的問題。 另外，背投影顯示螢幕400還可包括一光吸收圖案層 430，其配置於第一基板41〇的光出射面幻上，用以阻擋 ' 雜散光通過光出射面S2。光吸收圖案層430可減少環境光 入射第一基板4丨0或被第一基板410反射的機率。如此一 來，即可改善亮度較低的晝面被環境光干擾的情形，進而 * 提升背投影顯示螢幕4〇〇的晝面對比。當然，光吸收圖案 層430的分佈位置是根據影像光束L2在光出射面幻上的 光通量分佈而做決定。具體而言，光吸收圖案層430是以 分佈於光出射面S2上影像光束[2的光通量較低的部分為 佳。 此外，月投影顯示螢幕4〇〇還可包括一第二基板44〇， 其具有一第一表面S3與相對於第一表面S3的一第二表面 S4。第二基板440是以第一表面S3朝向第一基板41〇而 • 配置於光出射面S2旁。具體而言，第二基板440是配置 於第-基板410的光出射面82前，而影像光束L2是在依 序通過第一基板410與第二基板44〇後向外射出。在此， $二基板440的第一表面S3可為光擴散面，以使影像光 束L2能夠進行適當的混光。料，第二基板44〇的第二 表面S4可為防刮面，其形成方式例如是進行防刮處理或 貼附防刮片。 以下，將搭配圖示而介紹本發明的背投影顯示榮幕中 I2634f|^ltwfdoc/y ⑴， Ψ 0,少）= [#0, y)]mocU0 (2)， (3 )，以及 ._ {(m + n)2 +m-h3«} / J 2 (4)〇 其中為每一 區塊之相位函數 繞射光學元件層的細部結構。圖5繪示為圖3之背投影顯 示螢幕的示思圖。请參照圖4與圖5，本發明之背投影顯 示螢幕的設計方法是先將位於第一基板410之光入射面si 上的繞射光學元件層420劃分為多個區塊，例如區塊 Rl〇、R20、R30、R40、···。區塊的數量可視設計需求而 做調整。其中，影像光束L2進入各個區塊的角度均不相 同。然後，依據影像光束L2在這些區塊之入射角、水平 發散角與垂直發散角而決定這些區塊之厚度分佈函數，以 使背投影顯示螢幕400在水平與垂直方向上具有不同視 角。每一個區塊的厚度分佈函數表示為呛Μ。厚度分佈函 數/Κυ)表示每一個區塊以其中心為原點時，在水平座標值 與垂直座標值為(x，y)處的厚度。咖，力的計算方式如下： 學兀件層420之光束（亦即影像光束]^)的中心波長，而”(Λ) 為繞射光學元件層420對於所入射之光束的折射率 ，外，少） 則為除以4後所得之餘數。本實施中係以Σς "之 多項式來表示每一區塊之相位函數，每一區塊的/爪…與^ 則為系數，C,疋經過隶佳化（Qptimizati〇n)設計後所得。Kx, y) Ψ (χ, less) 1263445 16211twf.doc/y An opening. The optical engine is disposed in the outer casing, and the rear projection display is disposed at the opening of the outer casing. ' This electric light is longer: a design method of the rear projection display screen, which first divides a diffractive optical element layer on a light incident surface of a substrate into a plurality of blocks, and then according to the light beam The angle of incidence of these blocks, the divergence angle and the vertical divergence angle determine the thickness distribution function of these blocks, and the back projection shows that the screen has different viewing angles in the horizontal and vertical directions. In the above design method of the rear projection display screen, the method of determining the thickness distribution function of the block includes using the following relation: sub-Λ «Λ) -1) Χ¥(χ^) = [φ(χ,γ)]χηοάλ0 ^ = -XmYn 8 1263445 16211twf.doc/y Thus, the rear projection display screen of the present invention has the advantages of no assembly, light transmittance superior to conventional techniques, and low cost. In addition, the rear projection display screen of the present invention has the advantages of no ghosting, no visible traces of the naked eye, and high contrast. The above and other objects, features and advantages of the present invention will become more <RTIgt; [Embodiment] Referring to FIG. 3, a rear projection display device 3A according to an embodiment of the present invention includes a housing 320, an optical engine 310, and a rear projection display screen 400. The housing 320 is configured to fix the optical engine 310 and the rear projection display screen 400, and prevent external dust from contaminating the optical engine 310 to reduce the display quality of the rear projection display device 300. The optical engine 310 is disposed in the outer casing 320 and can be An image beam L2 is generated by the external image signal, and the image beam L2 is projected to the rear projection display screen 400. The rear projection display screen 400 is disposed at an opening 02 of the casing 320, and the image beam L2 passes first. The rear projection display screen 400 is projected to the user 50' to allow the user 50 to view the image through the rear projection display screen 400. Referring to FIG. 3 and FIG. 4, a rear projection display screen 400 according to an embodiment of the present invention includes a first substrate 410 and a diffractive optical element layer 420. The first substrate 410 has a light incident surface S1 and a light exit surface S2 with respect to the light incident surface S1. The diffractive optical element layer 420 is located on the light incident surface S1 of the first substrate 410 to condense the image light beam L2 passing through the diffractive optical element layer I263445twfd 〇c/y 420, and the image light beam L2 is horizontally and vertically Different divergence angles are emitted. The material of the first substrate 41 is made of polydimethyl phthalate, polyethylene propylene or other light transmissive materials. = due to the shadow 1 provided by the user while viewing the rear projection display device 3, the horizontal viewing angle range that can be used for the month b is large and the vertical viewing angle ^ the diffractive optical element layer 42_ is designed to make the image upward divergence angle It is better than the divergence angle in the vertical direction. The above-mentioned diffractive optical element layer 420 is processed, for example, on the light incident surface S1 of the first substrate. For example, the processing method of the diffractive optical element layer 420 is, for example, first forming a mother board (not shown), and then transferring the surface of the mother board to the younger brother by hot pressing, injection molding or other transfer technology- The light incident surface S1 of the substrate 4H). The formation of the mother board may be laser processing, electron beam processing, micro-shadow processing, knife processing or a detailed structure of the diffractive optical element layer 420. In the rear projection display screen 4 (8) of this embodiment, It has the dual functions of the convergence image beam L2 « and the divergence angle in the vertical direction of the light image level 14 (that is, the angle of view of the rear projection display device in the horizontal direction and the straight direction of the f), so that it can replace the unsuited lens in the prior art. Combination with a lenticular lens sheet. In other words, the back projection display screen 400 of the real t can avoid the production of the Philippine ear lens, and it takes 2 manpower and time to perform the group skirting, and there is no post-projection formed by the single-membrane. “It can avoid the 12634骀1 ltwf.doc/y light loss caused by the image beam L2 passing through the double diaphragm, and thus obtain higher screen brightness. When the diffractive optical element layer 42 is processed through high precision processing When the method is formed, the problem of the processing marks in the prior art can be improved. In addition, the rear projection display screen 400 can further include a light absorbing pattern layer 430 disposed on the light exit surface of the first substrate 41 ,, The light absorbing pattern layer 430 can reduce the probability that the ambient light is incident on or reflected by the first substrate 410. Thus, the brightness of the lower surface can be improved. The situation of being disturbed by ambient light, and then increasing the pupil face ratio of the rear projection display screen. Of course, the distribution position of the light absorbing pattern layer 430 is based on the luminous flux distribution of the image light beam L2 on the light exit surface. Specifically, the light absorbing pattern layer 430 is preferably a portion where the light flux of the image beam [2] is distributed on the light exit surface S2. Further, the moon projection display screen 4 〇〇 may further include a second substrate 44. The first surface S3 has a first surface S3 and a second surface S4 opposite to the first surface S3. The second substrate 440 is disposed along the first surface S3 toward the first substrate 41 and is disposed adjacent to the light exit surface S2. The second substrate 440 is disposed in front of the light exit surface 82 of the first substrate 410, and the image light beam L2 is sequentially emitted through the first substrate 410 and the second substrate 44. Here, $2 The first surface S3 of the substrate 440 may be a light diffusing surface to enable the image beam L2 to be properly mixed. The second surface S4 of the second substrate 44 may be a scratch-resistant surface, which is formed, for example, to prevent Scratch-treated or attached to the anti-scratch sheet. Hereinafter, I2634f|^ltwfdoc/y (1), Ψ 0, less) = [#0, y)]mocU0 (2) in the back projection display of the present invention will be described with reference to the illustration. ), (3), and ._ {(m + n)2 +m-h3«} / J 2 (4)〇 where is the phase function of each block The detailed structure of the diffractive optical element layer is shown in Fig. 5. Fig. 5 is a schematic diagram of the rear projection display screen of Fig. 3. Referring to Fig. 4 and Fig. 5, the design method of the rear projection display screen of the present invention is first placed first. The diffractive optical element layer 420 on the light incident surface si of the substrate 410 is divided into a plurality of blocks, such as the blocks R1, R20, R30, R40, .... The number of blocks can be adjusted according to design requirements. The angle of the image beam L2 entering each block is different. Then, the thickness distribution function of the block is determined according to the incident angle, the horizontal divergence angle and the vertical divergence angle of the image beam L2, so that the back projection display The screen 400 has different viewing angles in the horizontal and vertical directions. The thickness distribution function of each block is expressed as 呛Μ. The thickness distribution function /Κυ) indicates the thickness at the horizontal coordinate value and the vertical coordinate value (x, y) when each block has its center as the origin. The force is calculated as follows: the center wavelength of the beam of the element layer 420 (ie, the image beam), and "(Λ) is the refractive index of the diffractive optical element layer 420 for the incident beam. Less) is the remainder obtained by dividing by 4. In this implementation, the polynomial of Σς " is used to represent the phase function of each block, and the / claws of each block and ^ are coefficients, C, 疋After the design of Qptimizati〇n, it was obtained.
12 12634始__ 以區塊R20為例，假設影像光束L2在水平方向上是 以31.2入射，而在垂直方向上是以〇。入射。同時假設以 下條件：繞射光學元件層420之材質為ΡΜΜΑ ;影像光束 L2之中心波長Α。為587奈米；繞射光學元件層420對於587 奈米之中心波長2。的折射率〃(、)為1.49 ;且j為50。根據 螢幕視角需求，水平視角設計為60。，垂直視角設計為12 12634 __ Taking block R20 as an example, assume that image beam L2 is incident at 31.2 in the horizontal direction and 〇 in the vertical direction. Incident. At the same time, the following conditions are assumed: the material of the diffractive optical element layer 420 is ΡΜΜΑ; the center wavelength of the image beam L2 is Α. It is 587 nm; the diffractive optical element layer 420 has a center wavelength of 2 for 587 nm. The refractive index 〃(,) is 1.49; and j is 50. The horizontal viewing angle is designed to be 60 depending on the screen viewing angle. , the vertical viewing angle is designed as
35°，並設定第一基板410的厚度為18〇微米（micron)，對ς 最佳化（Optimization )設計後」j寻到C/如下表: C1:-4.1078E-01 C2:-1.0159E-07 C3:-4.0629E+〇〇 ^ ^ j 八 ' C4:1.3503E-04 C5:-2.5498E+00 C6M.1329E+01 C7:3.8116E-04 C8:-7.0188E+〇〇 C9.-1.9720E-05 0 Cl 1:-5.8763E-02 C12:1.5909E+02 C13:-1.2890E-01 C14:-4.4928E+02 C15:2.5740E+03 C16:-1.6549E-01 C17:3.553 1E+03 ------—____ C18:-2.2087E-01 C19:1.7271E+03 C20:2.3199E-02 -—------- C21:-4.7870E+00 C22:-8.7478E-04 C23:8.6639E-02 C24:-6.4848E-04 C25:3.1871E-02 C26:-1.0882E-03 C27:3.2321E-02 C28:-4.9276E-03 C29:5.4298E-01 C30:-4.8752E-03 C31:6.9150E-02 C32:-4.8775E-03 C33:-4.8061E-03 C34>4.8770E-03 C35:-8.1697E-05 C36:-4.4290E-02 C37:-4.8369E-03 C38:-4.8923E-03 C39:-4.8606E-03 C40:-4.8795E-03 C41>4.8579E-03 C42:-4.8788E-03 C43:-4.8798E-03 C44:-4.9988E-03 C45:-4.8782E-03 C46:-2.2200E-03 C47:-4.8777E-03 C48:-4.8769E-03 C49:-4.8778E-03 C50:-4.8768E-03 將上述數值代入方程式（3)與（4)，即可獲得如圖 6所不區塊R20之相位炝的分佈圖。接著，再將代 入方私式⑴與（2)，即可獲得如圖7所示區塊謂之 13 I2634^twfd〇c/y 厚度枪，>〇的分佈圖。藉由上 件層420之其他區塊的厚产 也可獲彳于繞射光學元 度心)進行繞射光學元件〗二白刀，°之後根據所得的厚 之繞射光學元件層420。 s 、口工，即可完成本發明 綜上所述，在本發明之背投影顯示 示螢幕中，係將會聚光束與調 顯 合在-個繞射光學元件層上，附直視角的功能整 兄、乐拉u t， 因此可取代習知技術中菲、、曰 耳透w與柱狀透則的組合。換言之，杯: 顯不螢幕具有下列優點： 久 月技衫35°, and set the thickness of the first substrate 410 to 18 μm (micron), and after optimizing the design, “j find C/ as follows: C1:-4.1078E-01 C2:-1.0159E -07 C3:-4.0629E+〇〇^ ^ j 八' C4:1.3503E-04 C5:-2.5498E+00 C6M.1329E+01 C7:3.8116E-04 C8:-7.0188E+〇〇C9.-1.9720E -05 0 Cl 1:-5.8763E-02 C12:1.5909E+02 C13:-1.2890E-01 C14:-4.4928E+02 C15:2.5740E+03 C16:-1.6549E-01 C17:3.553 1E+03 ------—____ C18:-2.2087E-01 C19:1.7271E+03 C20:2.3199E-02 -—------- C21:-4.7870E+00 C22:-8.7478E-04 C23:8.6639E-02 C24:-6.4848E-04 C25:3.1871E-02 C26:-1.0882E-03 C27:3.2321E-02 C28:-4.9276E-03 C29:5.4298E-01 C30:-4.8752E -03 C31:6.9150E-02 C32:-4.8775E-03 C33:-4.8061E-03 C34>4.8770E-03 C35:-8.1697E-05 C36:-4.4290E-02 C37:-4.8369E-03 C38 :-4.8923E-03 C39:-4.8606E-03 C40:-4.8795E-03 C41>4.8579E-03 C42:-4.8788E-03 C43:-4.8798E-03 C44:-4.9988E-03 C45:- 4.8782E-03 C46:-2.2200E-03 C47:-4.8777E-03 C48:-4.8769E-03 C49:-4.8778E-03 C50:-4.8768E-03 Substituting the above values into equation (3) and 4), the phase distribution can be obtained as shown in FIG. 6 soy do not block the R20. Then, by substituting the private formulas (1) and (2), the distribution map of the 13 I2634^twfd〇c/y thickness gun, > 区, as shown in Fig. 7 can be obtained. The diffractive optical element is obtained by the thickening of the other blocks of the upper layer 420, and the diffractive optical element layer 420 is formed according to the resulting thickness. s, or smuggling, can complete the present invention. In the back projection display screen of the present invention, the concentrated beam and the illuminating are combined on a layer of diffractive optical elements, and the function of the direct viewing angle is integrated. Brother, Le La ut, therefore can replace the combination of Philippine, 曰 ear permeable w and column permeable in the conventional technology. In other words, the cup: showing no screen has the following advantages:
取个早父低 +¾耗賈人力與時間進行組裝从令 不會有組裝後鍾曲而不平整的問題。 單層結構的背投影顯示螢幕因為衫透率言 畫面亮度較高。 w 四、 不會出現使料科透鏡片時所產生的鬼影。 五、 加工容易，不易產生肉眼可見的加工痕跡。 六、 搭配光吸收圖案層可減少環境光的干擾，進而 升晝面對比。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何熟習此技藝者，在不脫離本發明之精神 和範圍内，當可作些許之更動與潤飾，因此本發明之保罐 範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1繪示為一種習知背投影顯示裝置的示意圖。 圖2繪示為一種習知背投影顯示螢幕的局部剖視圖。 12634^— 圖3繪示為本發明一實施例之背投影顯示裝置的示意 圖。 圖4繪示為本發明圖3之背投影顯示螢幕的局部剖面 圖。 - 圖5繪示為本發明圖3之背投影顯示螢幕的示意圖。 圖6繪示為本發明區塊R20之相位拟^)的分佈圖。 圖7繪示為本發明區塊R20之厚度吣，>0的分佈圖。 【主要元件符號說明】 100 :背投影顯示裝置 110 :螢幕 120 :光學引擎 130 ·•外殼 L1 :影像光束 01 :開口 50 :使用者 200 ··背投影顯示螢幕 210 :菲涅耳透鏡片 220 :柱狀透鏡片 300 :背投影顯示裝置 310 :光學引擎 320 :外殼 400 ··背投影顯示螢幕 L2 :影像光束 02 :開口 15 I2634^twfdoc/y 410 :第一基板 420 :繞射光學元件層 430 :吸收圖案層 440 :第二基板 S1 :光入射面 : S2 :光出射面 : S3 :第一表面 S4 :第二表面 Φ R10、R20、R30、R40 :區塊Take a good early father +3⁄4 consumption manpower and time to assemble from the order, there will be no problem after the assembly is not smooth. The back projection of the single-layer structure shows that the screen has a high brightness due to the transmittance of the screen. w Fourth, there will be no ghosts produced when the lens is made. Fifth, the processing is easy, and it is not easy to produce visible traces of processing. Sixth, with the light absorption pattern layer can reduce the interference of ambient light, and then raise the face ratio. While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the cans is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a conventional rear projection display device. 2 is a partial cross-sectional view of a conventional rear projection display screen. 12634^— FIG. 3 is a schematic diagram of a rear projection display device according to an embodiment of the present invention. 4 is a partial cross-sectional view of the rear projection display screen of FIG. 3 of the present invention. - Figure 5 is a schematic view of the rear projection display screen of Figure 3 of the present invention. FIG. 6 is a diagram showing the distribution of the phase of the block R20 of the present invention. Fig. 7 is a view showing the distribution of the thickness 吣, > 0 of the block R20 of the present invention. [Description of main component symbols] 100: Rear projection display device 110: Screen 120: Optical engine 130 • Housing L1: Image beam 01: Opening 50: User 200 • Back projection display screen 210: Fresnel lens sheet 220: Cylindrical lens sheet 300: Rear projection display device 310: Optical engine 320: Housing 400 · Back projection display screen L2: Image beam 02: Opening 15 I2634^twfdoc/y 410: First substrate 420: Diffractive optical element layer 430 : absorption pattern layer 440 : second substrate S1 : light incident surface: S2 : light exit surface: S3 : first surface S4 : second surface Φ R10, R20, R30, R40 : block
1616