201133030 HD-2009-0015-TW 32361twf.doc/n 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種偏振分光器以及光學系統，且特 別是有關於-種利用膽固醇液晶層來產生偏振化光線 (polarized light)的偏振分光器（P〇Iarizati〇n Β_ 邱餘r， PBS)以及光學系統。 _ 【先前技術】 偏振分光益已經廣泛地應用在各種光學系統中，以提 供光學系統所需使用之具有特定極化方向的偏振化光線。 舉例來說，目前市面上的液晶投影機使用偏振分光器、來 將光源所產生的光轉換成液晶光閥所能夠利用的偏振化光 線，從而利用這些偏極化光線來投射出影像。 一般而言，偏振分光器可採用下述設計：如，金屬線 網偏振片（Wire-Grid Polarizer，WGP)、薄膜他择 η # (TMm P〇lari2er, TFP)- (P〇lymer-FilmP〇larizer，PFp)等。然而，習知的偏振分光器 的結構複雜且製造成本高’不利於偏振分光器的相關發展。 【發明内容】 有鑑於此，本發明提出一種偏振分光器，具有簡單的 結構，且能利用膽固醇液晶層來使得到偏振化光線。 本發明又提出-種光學系統，具有上述的偏振分光 器’可產生偏振化的影像光線。 201133030 015-TW 32361twf.doc/n 基於上述，本發明提供一種偏振分光器，包括.第一 棱鏡、第二棱鏡、配向層以及膽固醇液晶層。第一且 有相鄰的兩個第一面、及分別與兩個第—面形成二 的第一斜面。第二稜鏡具有相鄰的兩個第二面、及八“愈 兩個第二面形成第二夾角的第二斜面，且 與 货 ^ 斜面對向於 弟-斜面。配向層配置於第一稜鏡的第―斜面上。 液晶層配置於配向層與第二稜鏡的第二斜面之間。13 在本發明的一實施例中，上述膽固醇液晶^ 於〇.5微米（陴）〜2微米之間。 均的&度201133030 HD-2009-0015-TW 32361twf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a polarization beam splitter and an optical system, and more particularly to a liquid crystal layer using cholesterol A polarizing beam splitter (P〇Iarizati〇n Β_Qiu Yu r, PBS) that produces polarized light and an optical system. _ [Prior Art] Polarization splitting has been widely used in various optical systems to provide polarized light with a specific polarization direction required for optical systems. For example, liquid crystal projectors currently on the market use polarizing beamsplitters to convert the light generated by the light source into polarized light that can be utilized by the liquid crystal light valve, thereby utilizing these polarized light to project an image. In general, the polarizing beam splitter can be designed as follows: for example, Wire-Grid Polarizer (WGP), film η# (TMm P〇lari2er, TFP)- (P〇lymer-FilmP〇 Larizer, PFp), etc. However, the conventional polarization beam splitter has a complicated structure and high manufacturing cost, which is disadvantageous for the related development of the polarization beam splitter. SUMMARY OF THE INVENTION In view of the above, the present invention proposes a polarization beam splitter having a simple structure and capable of utilizing a cholesteric liquid crystal layer to cause polarized light. The present invention further proposes an optical system having the above-described polarization beam splitter' which produces polarized image light. 201133030 015-TW 32361twf.doc/n Based on the above, the present invention provides a polarization beam splitter comprising: a first prism, a second prism, an alignment layer, and a cholesteric liquid crystal layer. First, there are two adjacent first faces, and a first slope formed by two and two first faces respectively. The second crucible has two adjacent second faces, and eight "two second faces that form a second angle of the second bevel, and the device is inclined to face the oblique-face. The alignment layer is disposed at the first The liquid crystal layer is disposed between the alignment layer and the second slope of the second crucible. 13 In an embodiment of the invention, the cholesteric liquid crystal is 〇.5 micrometers (陴)~2 Between microns. Average & degree
在本發明的一實施例中，上述膽固醇液晶層包括古 分子材料以及多個膽固醇液晶分子。多個膽固^ :=:'，中。上述高分子材料可， 在本發明的一實施例中’上述配向層具 案。 9 /、虿一配向In an embodiment of the invention, the cholesteric liquid crystal layer comprises a paleo-molecular material and a plurality of cholesteric liquid crystal molecules. Multiple biliary ^ :=:', medium. The above polymer material may be, in an embodiment of the invention, the above-mentioned alignment layer. 9 /, 虿一配向
在本發明的一實施例中’上述的偏振分光器 多層膜，設置於膽固醇液晶層上，且多層膜位二膽^ 晶層與第二斜面之間。 ° 本發明又提供一種光學系統’包括：偏振分光器、 一顯示面板、第二顯示面板以及光源。偏振分光器包括. 第一稜鏡、第二稜鏡、配向層以及膽固醇液晶層。第—夫 鏡具有相鄰的兩個第一面、及分別與兩個第—二形成第^ 失角的第一斜面。第二稜鏡具有相鄰的兩個第二面、乐八 別與兩個第二面形成第二夾角的第二斜面，且第二斜=二 4 201133030 1 HD-2OO9-0015-TW 32j61twf.d〇c/n 向於弟一种®❿叼增配罝於第一役蜆的弟一种甸上。膘 固醇液晶層配置於st向層與第二稜鏡的第二斜面之間。第 一顯示面板平行於第一稜鏡的兩個第一面其中之一而嗖 置。第二齡面板平行於第二稜賴兩個第二面其中之Γ 而設置，且第i示面板相鄰於第二顯示面板。光 人器，光線具有第-偏振態及第= 液：：射：t鏡、具有第-偏振態的光線被膽固醇 線示面板行進，具有第—偏振態的光 =皮弟—和面板轉變成具有第二偏振態 光醇液丄 入射到第一稜鏡、具有第-伧捩 態的光線通過膽固醇液晶層 偏振 行進，具有第二偏振·如^ f-4不面板 第-偏振態的第二影像2線=二_不面板轉變為具有 鏡、被膽固醇、、夜m、、桌弟一影像光線返回第二稜 被膽固知液日日層反射且由第二稜鏡出射。 光源、本:光學系統’包括:偏振分光器以及 及膽固醇液=石夕基液晶反射式面板、· 膽固醇液ΐ二置::::==式面板上。 振分光哭，而来綠目士—㈢上先源k供先線，入射於偏 入射於八光^料—偏振態及第二偏《。當光線 影像光線:=晶反射式面板將光線轉變為 且’石夕基液晶反射式面板振態。並 的影像光線通過膽心:;層偏麵'或弟二偏振 201133030 ru^-zw?-u015-TW 3236ltwf.doc/n 本發明更提供一種光學系統，包 第-偏振分光器、第二偏振分光器以及。^晶面板、 面板具有彼此對向的第一表面與第二表面Λ、〃。穿透式液晶 器配置於穿透式液晶面板的第—表=一偏振分光 包括：第一配向層以及第一膽固醇弟二偏振分光器 】於第:-表面上’而第一膽固醇液晶二:置向二配 上。弟二偏振分光器配置於穿透 、一配向層 上。第二偏振分光器包括：第二配向層二及Z二二表面 晶層。第4向層配置於第二表面上:=膽固醇液 層配置於第二配向層上。光源接 #—膽固醇液晶 偏振態及第二偏振;，且==光線具有第― 振分光器、穿透式液晶面板4:偏=入射於第-偏 態的光線通過第—偏振分光器，且I有^ :。第一偏振 具有第二偏振態的影:::通線。 使得，本發明的偏振分光器採用膽固；夜晶：。 液晶層的光線能產生偏振化 器的製作相當容易且簡單固 以上=所需波長的偏振化光線。本發明4; a、扁振分光器，可簡化光學系統的相關 ^讓本發明之上述特徵 能更明顯易懂 福例，並配合所附圖式作詳細說明如下。文特 201133030 HD-2009-0015-TW 32361twf.doc/n 【實施方式】 偏振分光器 圖1為本發明較佳實施例的一種偏振分光器的示意 圖。請參照圖1 ’偏振分光器200包括：第一稜鏡21〇、第 二稜鏡220、配向層230以及膽固醇液晶層24〇。第一棱鏡 210具有相鄰的兩個第一面212、及分別與兩個第一面212 形成第一夾角Θ1的第一斜面214。第二稜鏡220具有相鄰 _ 的兩個第二面222、及分別與兩個第二面222形成第二夾 角Θ2的第二斜面224，且第二斜面224對向於第一斜面 214。配向層230配置於第一棱鏡21〇的第一斜面214上。 膽固醇液晶層240配置於配向層230與第二稜鏡220的第 二斜面224之間。 請繼續參照圖1 ’偏振分光器2〇〇採用膽固醇液晶層 =0的偏振化性質，從而可以得到偏振化光線。更詳細而 言’膽固醇液晶層240可包括：高分子材料242以及多個 膽固醇液晶分子244，而多個膽固醇液晶分子244分布於 • 冑分子材料242中。另外，高分子材料242例如為紫外光 固化型高分子材料。值得注意的是，膽固醇液晶層24〇内 的膽固醇液晶分子244具有不對稱向列相（dlirai n_tic phase)，可使光線在經過膽固醇液晶層24〇後產生偏振化 現象。當南分子材料242受到紫外光照射而固化時，可使 膽固醇液晶層240内的膽固醇液晶分子244保持在不對稱 向列的狀態。In an embodiment of the invention, the polarizing beam splitter multilayer film is disposed on the cholesteric liquid crystal layer and between the multilayer film layer and the second bevel layer. The present invention further provides an optical system' comprising: a polarization beam splitter, a display panel, a second display panel, and a light source. The polarizing beam splitter includes: a first germanium, a second germanium, an alignment layer, and a cholesteric liquid crystal layer. The first mirror has two adjacent first faces, and a first bevel that forms a second lost angle with the two second and second respectively. The second cymbal has two second faces adjacent to each other, the second slant with the two second faces forming a second angle, and the second slant=two 4 201133030 1 HD-2OO9-0015-TW 32j61twf. D〇c/n Adds a kind of ❿叼 to the younger brother of the first servant. The sterol liquid crystal layer is disposed between the st layer and the second slope of the second crucible. The first display panel is disposed parallel to one of the two first faces of the first turn. The second age panel is disposed parallel to the second edge of the two second faces, and the i-th panel is adjacent to the second display panel. Light human, light has a first-polarization state and a liquid =: liquid: t-mirror, light having a first-polarized state is traveled by a cholesterol line panel, light having a first-polarized state = skin-and-panel converted into Light having a second polarization state, the liquid liquid is incident on the first 稜鏡, and the light having the first 伧捩 state is polarized by the cholesteric liquid crystal layer, and has a second polarization, such as ^f-4, which is not the second state of the panel. Image 2 line = 2 _ no panel is converted to have a mirror, is cholesterol, night m, and the cousin image light returns to the second edge is reflected by the bile liquid day and is emitted by the second 稜鏡. Light source, this: optical system 'includes: polarized beam splitter and cholesteric liquid = Shihki liquid crystal reflective panel, · Cholesterol liquid two sets: :::: == on the panel. The vibration of the vibration is divided into light, and the green eyes - (3) the first source k for the first line, incident on the partial incidence of the light - the polarization state and the second bias. When the light image is light: = crystal reflective panel converts the light into and the 'Shi Xiji liquid crystal reflective panel vibration state. And the image light passes through the biliary heart; the layer eccentric surface or the second polarization 201133030 ru^-zw?-u015-TW 3236ltwf.doc/n The present invention further provides an optical system comprising a first-polarization beam splitter and a second polarization Beam splitter as well. The crystal panel and the panel have a first surface and a second surface Λ, 〃 opposite to each other. The penetrating liquid crystal is disposed on the penetrating liquid crystal panel. The first table = a polarization beam splitting includes: the first alignment layer and the first cholesterol dichroic beam splitter on the first surface - and the first cholesterol liquid crystal two: Set to the second match. The second polarizing beam splitter is disposed on the penetrating, aligning layer. The second polarizing beam splitter comprises: a second alignment layer 2 and a Z bis surface layer. The fourth direction layer is disposed on the second surface: the = cholesterol liquid layer is disposed on the second alignment layer. The light source is connected to the #-cholesterol liquid crystal polarization state and the second polarization; and == the light has a first vibration splitter, the transmissive liquid crystal panel 4: the bias light incident on the first-bias state passes through the first polarization splitter, and I have ^ :. The first polarization has a shadow of the second polarization state::: a line. Therefore, the polarization beam splitter of the present invention adopts a cholesterol; The light of the liquid crystal layer can produce a polarizer that is relatively easy to fabricate and simple to fix = polarized light of the desired wavelength. The present invention 4; a, a flat-lens spectroscope, which simplifies the correlation of the optical system. The above-described features of the present invention can be more clearly understood and described in detail with reference to the accompanying drawings. Ventilation 201133030 HD-2009-0015-TW 32361twf.doc/n Embodiments A polarization beam splitter Fig. 1 is a schematic view of a polarization beam splitter in accordance with a preferred embodiment of the present invention. Referring to Fig. 1, the polarization beam splitter 200 includes a first 稜鏡 21 〇, a second 稜鏡 220, an alignment layer 230, and a cholesteric liquid crystal layer 24 〇. The first prism 210 has two adjacent first faces 212 and a first slope 214 that forms a first angle Θ1 with the two first faces 212, respectively. The second turn 220 has two second faces 222 adjacent to each other, and a second slope 224 that forms a second angle Θ2 with the two second faces 222, respectively, and the second slope 224 faces the first slope 214. The alignment layer 230 is disposed on the first slope 214 of the first prism 21A. The cholesteric liquid crystal layer 240 is disposed between the alignment layer 230 and the second slope 224 of the second crucible 220. Referring to Fig. 1 'polarizing beam splitter 2', the polarizing light of cholesteric liquid crystal layer =0 is used, so that polarized light can be obtained. More specifically, the 'cholesterol liquid crystal layer 240' may include a polymer material 242 and a plurality of cholesteric liquid crystal molecules 244, and a plurality of cholesteric liquid crystal molecules 244 are distributed in the 胄 molecular material 242. Further, the polymer material 242 is, for example, an ultraviolet curable polymer material. It is worth noting that the cholesteric liquid crystal molecules 244 in the condensed liquid crystal layer 24 have an asymmetric negation phase (dlirai n_tic phase), which causes polarization of light after passing through the cholesteric liquid crystal layer 24 . When the south molecular material 242 is cured by irradiation with ultraviolet light, the cholesteric liquid crystal molecules 244 in the cholesteric liquid crystal layer 240 can be maintained in an asymmetrical nematic state.
在偏振分光器200中，膽固醇液晶層230的厚度H?|J 201133030 nu-/uuy-u015-TW 32361twf.doc/n 如是介於0.5微米〜2微米之間。這裡要說明的是，當膽固 醇液晶層230的厚度t越厚時，膽固醇液晶層230可過濾 出波長較長的光線。反之，當膽固醇液晶層230的厚度t 越薄時，膽固醇液晶層230可過濾出波長較短的光線。藉 由控制膽固醇液晶層230的厚度t，膽固醇液晶層230.可 過濾出所需之各種不同波長的偏振化光線。 另外，在偏振分光器2〇〇中，配向層230例如具有一 配向圖案（未繪示）。配向層23〇上的配向圖案可用來控 制膽固醇液晶分子244的傾倒角度。更詳細而言，在配向 層230上利用旋轉塗佈法製作膽固醇液晶層24〇 ’可同時 控制膽固醇液晶分子244的傾倒角度及膽固醇液晶層240 的厚度t。如此一來’可使膽固醇液晶層24〇能夠過濾出 特定波長的偏振化光線。 另外’請再參照圖1，第一稜鏡21〇或第二稜鏡22〇 的^質例如是透明有機材料或透明玻璃。就第-稜鏡210 而。兩個第—面212與第一斜面214所形成的第一夾角 可為45度。就第二稜鏡22〇而言，兩個第二面與第二 3二34所形成的第二夾角可為45度。換言之，第-稜鏡 棱鏡22G例如"^形狀為等腰直角三角形之稜鏡。 J2為本發明較佳實施例的另—種偏振分光器的示意 ®月=,、、、圖2，偏振分光器2〇〇a與偏振分光器2〇〇大致 目三目同的構件以相同的標號表示，且不再重同的 内容。 月，…、圖2，偏振分光器2〇〇a更包括多層膜25〇，設 201133030 HD-2009-0015-TW 32361twf.doc/n 醇液晶層MO上，且此多層膜250位於膽固醇液 曰曰^ 240與第二斜面224之間。多層膜25〇可保護膽固醇 ίίΐ240，且能提昇通過膽固醇液晶層240的偏振化光 、’’、牙透率另外’夕層膜25〇還能增加偏振分光器 所能過濾的光線的波長範圍。 在上述的實施例中’由於偏振分光器200、20〇a均具 固醇液晶層240’所以可使用膽固醇液晶層24〇的光 f來產生偏振化光線。特別是，利用膽固醇液晶層240 土配第-稜鏡210與第二稜鏡22()，可製作出結構相當簡 早的偏振分光器200、200a。 、再者’在膽固醇液晶層240未固化前，可以利用旋轉 法在第一稜鏡21〇的第一斜面214、或第二稜鏡22〇 的第一斜面224上製作特定厚度的膽固醇液晶層24〇，亦 即，可容易地控制膽固醇液晶層24〇的厚度，而能夠得到 所需偏振化光線的波長波段。 # 光學系統 圖3為本發明較佳實施例的一種光學系統的示意圖。 ，參照圖3 ’光學系統300包括：上述的偏振分光器200、 第一顯示面板310、第二顯示面板320以及光源330。偏振 分光器200可參照上述之說明，此處不再重述。 請參照圖3，第一顯示面板310平行於第一棱鏡210 的兩個第一面212其中之一而設置。第二顯示面板320平 行於第二稜鏡220的兩個第二面222其中之一而設置，且 201133030In the polarization beam splitter 200, the thickness H?|J 201133030 nu-/uuy-u015-TW 32361twf.doc/n of the cholesteric liquid crystal layer 230 is between 0.5 μm and 2 μm. It is to be noted that when the thickness t of the cholesteric liquid crystal layer 230 is thicker, the cholesteric liquid crystal layer 230 can filter out light of a longer wavelength. On the contrary, when the thickness t of the cholesteric liquid crystal layer 230 is thinner, the cholesteric liquid crystal layer 230 can filter out light having a shorter wavelength. By controlling the thickness t of the cholesteric liquid crystal layer 230, the cholesteric liquid crystal layer 230 can filter out the polarized light of various wavelengths required. Further, in the polarization beam splitter 2, the alignment layer 230 has, for example, an alignment pattern (not shown). The alignment pattern on the alignment layer 23 can be used to control the tilt angle of the cholesteric liquid crystal molecules 244. More specifically, the cholesteric liquid crystal layer 24?' can be formed by the spin coating method on the alignment layer 230 to simultaneously control the tilting angle of the cholesteric liquid crystal molecules 244 and the thickness t of the cholesteric liquid crystal layer 240. In this way, the cholesteric liquid crystal layer 24 can be filtered to filter out polarized light of a specific wavelength. Further, referring again to Fig. 1, the first 稜鏡 21 〇 or the second 稜鏡 22 〇 is, for example, a transparent organic material or a transparent glass. On the first -稜鏡210. The first angle formed by the two first faces 212 and the first bevel 214 may be 45 degrees. For the second 稜鏡 22 ,, the second angle formed by the two second faces and the second 322 may be 45 degrees. In other words, the first-twist prism 22G has, for example, a shape of an isosceles right triangle. J2 is a schematic diagram of another polarizing beam splitter according to a preferred embodiment of the present invention, and, in FIG. 2, the polarizing beam splitter 2A is substantially the same as the polarizing beam splitter 2 The label indicates that it is no longer the same content. Month, ..., Figure 2, the polarization beam splitter 2〇〇a further comprises a multilayer film 25〇, which is set on the 201133030 HD-2009-0015-TW 32361twf.doc/n alcohol liquid crystal layer MO, and the multilayer film 250 is located in the cholesterol liquid layer Between 240 240 and the second slope 224. The multilayer film 25 〇 protects the cholesterol ί ΐ 240 and enhances the polarized light passing through the cholesteric liquid crystal layer 240, '', and the tooth opacity ratio 〇 layer 25 〇 can also increase the wavelength range of light that can be filtered by the polarization beam splitter. In the above embodiment, since the polarization beam splitters 200, 20a each have the sterol liquid crystal layer 240', the light f of the cholesteric liquid crystal layer 24 can be used to generate polarized light. In particular, by using the cholesteric liquid crystal layer 240 to form the first 稜鏡210 and the second 稜鏡22(), the polarizing beamsplitters 200 and 200a having a relatively simple structure can be produced. Further, before the cholesteric liquid crystal layer 240 is uncured, a specific thickness of the cholesteric liquid crystal layer can be formed on the first inclined surface 214 of the first 稜鏡 21 、 or the first inclined surface 224 of the second 稜鏡 22 旋转 by the rotation method. 24 〇, that is, the thickness of the cholesteric liquid crystal layer 24 可 can be easily controlled, and the wavelength band of the desired polarized ray can be obtained. #光学系统 Figure 3 is a schematic illustration of an optical system in accordance with a preferred embodiment of the present invention. Referring to FIG. 3, the optical system 300 includes the above-described polarization beam splitter 200, the first display panel 310, the second display panel 320, and the light source 330. The polarization beam splitter 200 can be referred to the above description and will not be repeated here. Referring to FIG. 3, the first display panel 310 is disposed parallel to one of the two first faces 212 of the first prism 210. The second display panel 320 is disposed parallel to one of the two second faces 222 of the second port 220, and 201133030
015-TW 32361twf.doc/n 第一顯示面板310相鄰於第二顯示面板320。光源330提 供光線332’入射於偏振分光器200,此光線332具有第一 偏振態332a及第二偏振態332b。 請繼續參照圖3，在此光學系統300中，入射到第一 稜鏡210、具有第一偏振態332a的光線332被膽固醇液晶 層240反射而往第一顯示面板310行進。具有第一偏振態 332a的光線332被第一顯示面板31〇轉變成具有第二偏振 態332b的第一影像光線Ml。第一影像光線Ml返回第一 稜鏡210、通過膽固醇液晶層240且由第二稜鏡220出射。 另一方面，入射到第一稜鏡21〇、具有第二偏振態332b 的光線332通過膽固醇液晶層240與第二稜鏡220而往第 二顯示面板320行進。具有第二偏振態332b的光線332 被第二顯示面板3 20轉變為具有第一偏振態3 32a的第二影 像光線M2。弟二影像光線M2返回第二稜鏡220、被膽固 醇液晶層240反射且由第二稜鏡22〇出射。 光學系統300還可包括：投影鏡頭34〇，配置於第一 影像.光線Ml與第二影像光線m2的光路上。換言之，圖3 所繪示的光學系統3〇〇例如是兩片液晶面板式的液晶投影 機’可投射出影像。 在其他的貫施例中’光學系統3〇〇中的偏振分光器2〇〇 也可以替換成圖2的偏振分光器2〇〇a，藉以使得光學系統 3〇〇可對波長範圍較大的光線進行過濾，或是使膽固醇液 晶層240得到較佳的保護。 圖4為本發明較佳實施例的另一種光學系統的示意 201133030 ^ tiu-zuuy-0015-TW 32j61twf.doc/n 圖。請參照圖4 ’光學系統400包括：偏振分光器410以 及光源420 °偏振分光器410包括：矽基液晶反射式面板 412、配向層414以及膽固醇液晶層416。配向層414配置 於矽基液晶反射式面板412上’膽固醇液晶層416配置於 配向層414上。 請繼續參照圖4，光源420提供光線422，入射於偏 振分光器410，而光線422具有第一偏振態422a及第二偏 振態422b。當光線422入射於偏振分光器41〇時，矽基液 晶反射式面板412將光線422轉變為影像光線M，而影像 光線Μ具有第一偏振態422a或第二偏振態422b (圖中繪 示為第一偏振態422a)。並且，在圖4所綠示的實施例中， 石夕基液晶反射式面板412使具有第一偏振態422a的影像光 線V[通過膽固醇液晶層416而出射。在其他的實施例中， 石夕基液晶反射式面板412則會使具有第二偏振態422b的影 像光線Μ通過膽固醇液晶層416而出射。 類似地，在光學系統400中，關於膽固醇液晶層416 的材料、.厚度、配向層414的配向圖案（未繪示）^已於 圖1的相關内容中敘述’在此不予以重述。值得一提的是， 藉由控制膽固醇液晶層416的厚度與膽固醇液晶分子244 的傾倒角度，可使膽固醇液晶層416過濾出所需之不同波 長的偏極化光線。 請繼續參考圖4 ’光學系統400更包括：投影鏡頭 430，配置於出射的、具有第一偏振態422a的影像光線μ 的光路上。換言之，圖4所繪示的光學系統4〇〇例如是反 11 201133030 ηι^-^υυ^-υΟ 15-TW 32361twf.doc/n 射式液晶投影機，可投射出影像。 圖5A與圖5B為本發明較佳實施例的科兩 統的示意圖。在圖5A的實施例中’偏振分光哭41〇 包括：保護層p，設置於膽固醇液晶層416上°°。 還可 可保護膽固醇液晶層416免於受到水氣或是外力= 損傷。保護層P的材質例如為玻璃或是其他具有保=效 的材質。在圖5B的實施例中，偏振分光器41〇則:且 多層膜F，設置於膽固醇液晶層4i6上。多層㈣^提供015-TW 32361twf.doc/n The first display panel 310 is adjacent to the second display panel 320. Light source 330 provides light 332' to the polarizing beam splitter 200, which has a first polarization state 332a and a second polarization state 332b. Referring to FIG. 3, in the optical system 300, the light 332 having the first polarization state 332a incident on the first pupil 210 is reflected by the cholesteric liquid crystal layer 240 and travels toward the first display panel 310. Light ray 332 having a first polarization state 332a is converted by first display panel 31A into first image ray M1 having a second polarization state 332b. The first image ray M1 returns to the first 稜鏡210, passes through the cholesteric liquid crystal layer 240, and is emitted by the second cymbal 220. On the other hand, the light ray 332 incident on the first pupil 21b and having the second polarization state 332b travels through the cholesteric liquid crystal layer 240 and the second buffer 220 to the second display panel 320. Light ray 332 having a second polarization state 332b is converted by second display panel 320 into a second image ray M2 having a first polarization state 332a. The second image ray M2 returns to the second ridge 220, is reflected by the cholesteric liquid crystal layer 240, and is emitted by the second 稜鏡22〇. The optical system 300 can further include a projection lens 34〇 disposed on the optical path of the first image, the light M1, and the second image light m2. In other words, the optical system 3 shown in Fig. 3, for example, two liquid crystal panel type liquid crystal projectors can project an image. In other embodiments, the polarization beam splitter 2〇〇 in the optical system 3〇〇 can also be replaced with the polarization beam splitter 2〇〇a of FIG. 2, so that the optical system 3 can have a larger wavelength range. The light is filtered or the cholesteric liquid crystal layer 240 is preferably protected. 4 is a schematic diagram of another optical system of the preferred embodiment of the present invention 201133030 ^ tiu-zuuy-0015-TW 32j61twf.doc/n. Referring to FIG. 4, the optical system 400 includes a polarization beam splitter 410 and a light source 420 ° polarization beam splitter 410 including a ruthenium-based liquid crystal reflective panel 412, an alignment layer 414, and a cholesteric liquid crystal layer 416. The alignment layer 414 is disposed on the NMOS liquid crystal reflective panel 412. The cholesteric liquid crystal layer 416 is disposed on the alignment layer 414. 4, the light source 420 provides light 422, incident on the polarization beam splitter 410, and the light 422 has a first polarization state 422a and a second polarization state 422b. When the light ray 422 is incident on the polarization beam splitter 41 , the 矽-based liquid crystal reflective panel 412 converts the light 422 into the image light M, and the image light Μ has a first polarization state 422a or a second polarization state 422b (shown as First polarization state 422a). Further, in the embodiment shown in Fig. 4, the Shihki liquid crystal reflective panel 412 causes the image light V having the first polarization state 422a to pass through the cholesteric liquid crystal layer 416. In other embodiments, the Shihki liquid crystal reflective panel 412 causes the image light having the second polarization state 422b to exit through the cholesteric liquid crystal layer 416. Similarly, in the optical system 400, the material, the thickness of the cholesteric liquid crystal layer 416, and the alignment pattern (not shown) of the alignment layer 414 have been described in the related content of Fig. 1 and will not be repeated here. It is worth mentioning that by controlling the thickness of the cholesteric liquid crystal layer 416 and the tilting angle of the cholesteric liquid crystal molecules 244, the cholesteric liquid crystal layer 416 can be filtered out of the polarized light of different wavelengths required. Continuing to refer to FIG. 4, the optical system 400 further includes a projection lens 430 disposed on the optical path of the outgoing image light μ having the first polarization state 422a. In other words, the optical system 4 shown in FIG. 4 is, for example, an inverse 11 201133030 ηι^-^υυ^-υΟ 15-TW 32361twf.doc/n liquid crystal projector capable of projecting an image. 5A and 5B are schematic views of a system according to a preferred embodiment of the present invention. In the embodiment of Fig. 5A, the 'polarized light splitting 41' includes a protective layer p disposed on the cholesteric liquid crystal layer 416. It is also possible to protect the cholesteric liquid crystal layer 416 from moisture or external force = damage. The material of the protective layer P is, for example, glass or other material having a protective effect. In the embodiment of Fig. 5B, the polarization beam splitter 41 is: and the multilayer film F is disposed on the cholesteric liquid crystal layer 4i6. Multi-layer (four) ^ provided
偏振分光器410額外的光學效果，例如：择士你，八 4 嶒加偏振分光器 41〇所能過濾的光線的波長範圍，或是提高偏振分光器41〇 的整體穿透率。 ° 由上述可知，可將膽固醇液晶層416直接製作在石夕基 液晶反射式面板412上，而得到能投射出偏振化的影像& 線Μ的光學系統400。 圖6為本發明較佳實施例的又一種光學系統的示音 ，。請參照圖6，光學系統500包括：穿透式液晶面板 苐一偏振分光器520、第二偏振分光器53〇以及光源540。The additional optical effects of the polarizing beam splitter 410, such as the wavelength range of the light that can be filtered by the polarizer beam splitter, or the overall transmittance of the polarizing beam splitter 41〇. ° As can be seen from the above, the cholesteric liquid crystal layer 416 can be directly formed on the Shihki liquid crystal reflective panel 412 to obtain an optical system 400 capable of projecting a polarized image & Figure 6 is a diagram showing still another optical system of the preferred embodiment of the present invention. Referring to FIG. 6, the optical system 500 includes a transmissive liquid crystal panel, a polarization beam splitter 520, a second polarization beam splitter 53A, and a light source 540.
請參照圖6，穿透式液晶面板510具有彼此對向的第 一表面512與第二表面514。第一偏振分光器520配置於 牙透式液晶面板510的第一表面512上。第一偏振分光器 520包括：第一配向層522以及第一膽固醇液晶層524。第 一配向層522配置於第一表面512上，而第一膽固醇液晶 層524配置於第一配向層522上。另外’第二偏振分光器 530配置於穿透式液晶面板510的第二表面514上。第二 12 201133030 m^W9-〇〇i5.TW 32361fwfd〇c/n 偏振分光态530包括：第二配向層532以及第二膽固醇液 晶層534。第二配向層532配置於第二表面514上，而第 二膽固醇液晶層534配置於第二配向層532上。 睛繼續參照圖6，光源540提供光線542，此光線542 具有第一偏振態542a及第二偏振態542b，且光線542從 第一表面512側入射於第一偏振分光器52〇、穿透式液晶 面板510與第二偏振分光器5 3 〇。第一偏振態542 a的光線 _ 542通過第一偏振分光器52〇，且具有第一偏振態^。的 光線542經由穿透式液晶面板51〇轉變為具有第二偏振態 542b的影像光線M。具有第二偏振態542b的影像光線％ 通過第一偏振分光器530而出射。 在光學系統500中，第一或第二膽固醇液晶層524、 53'的厚度tl、t2例如介於〇·5微米〜2微米之間。藉由控 制第一或第二膽固醇液晶層524、534的厚度u、口，第一 或第二膽固醇液晶層524、534便可過濾出所需波長之偏振 化光線。 • 卜膽固醇液晶層524包括：高分子材料S25以及多 個^固醇液晶分子526，而多麵固醇液晶分子分布 於南分子材料525中。第二膽固醇液晶層534包括：高分 子材料535以及多個膽固醇液晶分子536，而多個膦固醇 液晶分子536分布於高分子材料535中。高分子材料°525、 535例如為紫外光固化型高分子材料。 此外，在光學系統5〇〇中，第一配向層522或第二配 向層532可分別具有一配向圖案（未緣示）。可藉由第一 13 201133030 , α·*-^ 15-TW 32〇61twf.doc/n 或第二配向層522、532上的配向圖案來控制膽固醇液晶分 子526、536的傾倒角度。 由此可知，光學系統500的第一、第二膽固醇液晶層 524、534可用來取代傳統上設置在液晶面板兩側的偏光 片，從而能根據穿透式液晶面板510中的液晶層的偏轉狀 態，而投射出影像光線M。 綜上所述’本發明的偏振分光器及光學系統至少且有 以下特點： /、 本與光雄用膽固醇液晶層’藉由膽11醇液晶層的 易I㈣:可使光線偏振化。另外，透過旋轉塗佈法可容 有上述的偏振光線的偏振分光11。由於光學系統具 線轉換，光學系統可將光源所提供的光 本發明，以貫施例揭露如上，然其並非用以限定 本發明之精射^術領域中具有通f知識者，在不脫離 發明之保内，當可作些許之更動與潤飾，故本 ㈣後附之中請專職_界定者為準。 【圖式簡單說明】 圖 為本料較佳實施儀-種偏振分光器的示意 圖 θ為本發明較佳實施例的另一種偏振分光 器的示意 14 201133030 n^uu9-0015-TW 32361twf.doc/n 圖3為本發明較佳實施例的一種光學系統的示意圖。 圖4為本發明較佳實施例的另一種光學系統的示意 圖。 圖5A與圖5B為本發明較佳實施例的另外兩種光學系 統的不意圖。 圖6為本發明較佳實施例的又一種光學系統的示意 圖。 【主要元件符號說明】 200 ' 200a、410 :偏振分光器 21〇 :第一稜鏡 212 :第一面 214 :第一斜面 220 :第二稜鏡 222 :第二面 224 :第二斜面 230 :配向層 240、416 :膽固醇液晶層 242、417' 525、535:高分子材料 244、418、526、536 :膽固醇液晶分子 250、F :多層膜 300、400、500 :光學系統 310 :第一顯示面板 320 :第二顯示面板 15 201133030 nj^-zuu^-wO 15-TW 32j61twf.doc/n 330、420、540 :光源 332、422、542 :光線 332a、422a、542a :第一偏振態 332b、422b、542b :第二偏振態 340 :投影鏡頭 412 :矽基液晶反射式面板 414 :配向層 510 :穿透式液晶面板 512 :第一表面 514 :第二表面 520 :第一偏振分光器 522 :第一配向層 524 :第一膽固醇液晶層 530 :第二偏振分光器 532 :第二配向層 534 :第二膽固醇液晶層 Μ :影像光線Referring to FIG. 6, the transmissive liquid crystal panel 510 has a first surface 512 and a second surface 514 that face each other. The first polarization beam splitter 520 is disposed on the first surface 512 of the tooth-operated liquid crystal panel 510. The first polarization beam splitter 520 includes a first alignment layer 522 and a first cholesteric liquid crystal layer 524. The first alignment layer 522 is disposed on the first surface 512, and the first cholesteric liquid crystal layer 524 is disposed on the first alignment layer 522. Further, the second polarization beam splitter 530 is disposed on the second surface 514 of the transmissive liquid crystal panel 510. The second 12 201133030 m^W9-〇〇i5.TW 32361fwfd〇c/n polarization splitting state 530 includes a second alignment layer 532 and a second cholesterol liquid crystal layer 534. The second alignment layer 532 is disposed on the second surface 514, and the second cholesteric liquid crystal layer 534 is disposed on the second alignment layer 532. Continuing to refer to FIG. 6, the light source 540 provides a light 542 having a first polarization state 542a and a second polarization state 542b, and the light ray 542 is incident on the first polarization beam splitter 52 from the first surface 512 side, and is transparent. The liquid crystal panel 510 and the second polarization beam splitter 5 3 〇. The ray _ 542 of the first polarization state 542a passes through the first polarization beam splitter 52 and has a first polarization state. The light ray 542 is converted into the image light M having the second polarization state 542b via the transmissive liquid crystal panel 51. The image light % having the second polarization state 542b is emitted through the first polarization beam splitter 530. In the optical system 500, the thicknesses t1, t2 of the first or second cholesteric liquid crystal layers 524, 53' are, for example, between 微米5 μm and 2 μm. By controlling the thickness u, the mouth of the first or second cholesteric liquid crystal layers 524, 534, the first or second cholesteric liquid crystal layers 524, 534 can filter out the polarized light of the desired wavelength. • The cholesteric liquid crystal layer 524 includes a polymer material S25 and a plurality of sterol liquid crystal molecules 526, and the faceted sterol liquid crystal molecules are distributed in the south molecular material 525. The second cholesteric liquid crystal layer 534 includes a high molecular material 535 and a plurality of cholesteric liquid crystal molecules 536, and a plurality of phosphine liquid crystal molecules 536 are distributed in the polymer material 535. The polymer materials ° 525 and 535 are, for example, ultraviolet curable polymer materials. Further, in the optical system 5, the first alignment layer 522 or the second alignment layer 532 may have an alignment pattern (not shown), respectively. The tilt angle of the cholesteric liquid crystal molecules 526, 536 can be controlled by the alignment pattern on the first 13 201133030, α·*-^ 15-TW 32〇61 twf.doc/n or the second alignment layers 522, 532. It can be seen that the first and second cholesteric liquid crystal layers 524, 534 of the optical system 500 can be used to replace the polarizing plates conventionally disposed on both sides of the liquid crystal panel, so that the deflection state of the liquid crystal layer in the transmissive liquid crystal panel 510 can be obtained. And the image light M is projected. As described above, the polarizing beam splitter and the optical system of the present invention have at least the following features: /, the cholesteric liquid crystal layer of the present and the optical males'. By the light I (4) of the cholesteryl liquid crystal layer: the light can be polarized. Further, the polarization splitting light 11 of the above-mentioned polarized light can be accommodated by the spin coating method. Since the optical system has a line conversion, the optical system can provide the light provided by the light source. The present invention is disclosed in the above embodiments. However, it is not intended to limit the knowledge of the present invention. In the insurance of the invention, when some changes and refinements can be made, the full-time _ demarcation of this (4) post-attachment shall prevail. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a preferred embodiment of a polarizing beam splitter. FIG. 2 is a schematic diagram of another polarizing beam splitter according to a preferred embodiment of the present invention. 14 201133030 n^uu9-0015-TW 32361twf.doc/ Figure 3 is a schematic illustration of an optical system in accordance with a preferred embodiment of the present invention. Figure 4 is a schematic illustration of another optical system in accordance with a preferred embodiment of the present invention. Figures 5A and 5B are schematic illustrations of two other optical systems in accordance with a preferred embodiment of the present invention. Figure 6 is a schematic illustration of yet another optical system in accordance with a preferred embodiment of the present invention. [Description of main component symbols] 200 '200a, 410: polarizing beam splitter 21〇: first 稜鏡 212: first face 214: first slope 220: second 稜鏡 222: second face 224: second slope 230: Alignment layers 240, 416: cholesteric liquid crystal layer 242, 417' 525, 535: polymer material 244, 418, 526, 536: cholesteric liquid crystal molecules 250, F: multilayer film 300, 400, 500: optical system 310: first display Panel 320: second display panel 15 201133030 nj^-zuu^-wO 15-TW 32j61twf.doc/n 330, 420, 540: light sources 332, 422, 542: light rays 332a, 422a, 542a: first polarization state 332b, 422b, 542b: second polarization state 340: projection lens 412: 矽-based liquid crystal reflective panel 414: alignment layer 510: transmissive liquid crystal panel 512: first surface 514: second surface 520: first polarization beam splitter 522: First alignment layer 524: first cholesteric liquid crystal layer 530: second polarization beam splitter 532: second alignment layer 534: second cholesteric liquid crystal layer Μ: image light
Ml:第一影像光線 M2 :第二影像光線 P :保護層 t、U、t2 :膽固醇液晶層的厚度 Θ1 :第一夾角 Θ2 :第二夾角Ml: first image light M2: second image light P: protective layer t, U, t2: thickness of cholesteric liquid crystal layer Θ1: first angle Θ2: second angle