1356191 100年07月2'2日核正替換頁 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明關於一種投影光學系統，尤其係一種具有高對比 度之立體投影光學系統。 【先前技術】 [0002] 近年來，圖像投影儀，尤其數位投影儀，作為向觀眾顯 示多種訊息之工具已經逐漸流行。一般，這些投影儀用 於將由電腦生成之圖像投影到螢幕上。對觀看者來說， 圖像投影儀投影之圖像通常看起來係平面二維圖像，除 圖像本身外無法顯示任何圖像景深訊息。這種顯示可以 適用於顯示多種訊息。但是，在某些情況下，觀看者希 望能有比二維顯示能夠更大程度地顯示圖像之景深或結 構特徵之投影儀。 [0003] 使二維顯示之圖像能給出圖像景深之一種方式係通過立 體地顯示圖像。立體圖像，通常稱為“三維”或“3D” 圖像，在觀看者看來具有深度尺寸。這些圖像包括分開 〇 的、疊合的左眼及右眼圖像，這些圖像設置成模仿人之 左右眼觀看時，由於人眼睛間隔引起之三維物體表面之 微小差別，而具有之景深圖像。左眼及右眼圖像係這樣 來顯示，即觀看者之右眼看不到左眼圖像，左眼看不到 右眼圖像。這磕顯示方式一般借助於觀看者佩戴之光學 濾光鏡。 [0004] 通常顯示立體圖像之方式係使用兩個分開之圖像投影系 統分別來投影左眼圖像及右眼圖像。而這種系統在成功 地用於形成立體圖像之同時，系統之成本和重量則比單 096136371 表單編號A0101 第3頁/共14頁 1003267165-0 1356191 - 100年.07月日修正替&頁 個投影儀要高很多。而且，兩個投影儀要求光學對準相 對困難並比較費時。還有，由於這兩個系統之重量及體 積，使這種系統在兩個位置之間移動起來特別困難，還 有存在潛在之圖像對準之問題。 【發明内容】 [0005] 有鑒於此，有必要提供一種能夠提高對比度之立體投影 光學系統。 [0006] —種立體投影光學系統，其包括依光路設置之： [0007] 一圖像吸收器，用於接收入射光，對該入射光進行調制 β 並載入空間訊息，並出射經調制並載入有空間訊息之偏 振方向垂直之第一偏振光及第二偏振光； [0008] —穿透式光調制器，設置於所述圖像吸收器出射之第一 偏振光之出射光路上，該穿透式光調制器具有開啟及截 止兩個交替之工作狀態，該穿透式光調制器處於開啟狀 態時，所述第一偏振光穿過所述穿透式光調制器，該穿 透式光調制器處於截止狀態時，所述穿ιέ式光調制器將 | 入射的所述第一偏振光調制為第二偏振光並出射。 [0009] 上述立體投影光學系統使用時可通過為穿透式光調制器 輸入訊號使得該穿透式光調制器具有開啟及截止兩個交 替之工作狀態，使得觀看者之左、右眼交替獲得不同偏 振狀態之影像，當該輸入訊號之頻率足夠快時，觀看者 之左右眼分別戴上檢偏方向相互垂直之兩片偏振片，就 可以觀察到立體之圖像訊息。 【實施方式】 096136371 表單编號Α0101 第4頁/共14頁 1003267165-0 13561911356191 July 2, 2, 2, nucleus replacement page VI. Description of the Invention: [Technical Field] [0001] The present invention relates to a projection optical system, and more particularly to a stereoscopic projection optical system having high contrast. [Prior Art] [0002] In recent years, image projectors, especially digital projectors, have become popular as tools for displaying a variety of messages to viewers. Typically, these projectors are used to project a computer generated image onto a screen. For the viewer, the image projected by the image projector usually looks like a flat two-dimensional image, and no image depth of field information can be displayed except the image itself. This display can be used to display a variety of messages. However, in some cases, the viewer desires to have a projector that can display the depth of field or structural features of the image to a greater extent than the two-dimensional display. One way to enable an image of a two-dimensional display to give an image depth of field is by displaying the image in a stereoscopic manner. Stereoscopic images, often referred to as "three-dimensional" or "3D" images, have a depth dimension to the viewer. These images include separate, overlapping left and right eye images that are arranged to mimic the slight difference in the surface of the three-dimensional object caused by the human eye's eye when viewed from the left and right eyes of the person. image. The left and right eye images are displayed such that the viewer's right eye does not see the left eye image and the left eye does not see the right eye image. This way of display is generally by means of an optical filter worn by the viewer. [0004] A method of displaying a stereoscopic image generally uses two separate image projection systems to project a left eye image and a right eye image, respectively. While this system is successfully used to form stereoscopic images, the cost and weight of the system is more than 096136371 Form No. A0101 Page 3 / Total 14 Pages 1003267165-0 1356191 - 100.07. The page projector is much higher. Moreover, the two projectors require optical alignment to be relatively difficult and time consuming. Also, due to the weight and volume of the two systems, it is particularly difficult to move such a system between two locations, with potential image alignment problems. SUMMARY OF THE INVENTION [0005] In view of the above, it is necessary to provide a stereoscopic projection optical system capable of improving contrast. [0006] A stereoscopic projection optical system comprising an optical path: [0007] an image absorber for receiving incident light, modulating the incident light β and loading a spatial message, and emitting the modulated Loading a first polarized light and a second polarized light having a polarization direction perpendicular to the spatial information; [0008] a transmissive optical modulator disposed on an outgoing optical path of the first polarized light emitted by the image absorber, The transmissive light modulator has two alternating working states of turning on and off. When the penetrating light modulator is in an on state, the first polarized light passes through the penetrating light modulator, and the penetrating When the light modulator is in an off state, the through-type light modulator modulates the incident first polarized light into a second polarized light and exits. [0009] The stereoscopic projection optical system can be used to input signals to the transmissive optical modulator such that the transmissive optical modulator has two alternating working states of opening and closing, so that the left and right eyes of the viewer are alternately obtained. For images with different polarization states, when the frequency of the input signal is fast enough, the left and right eyes of the viewer respectively wear two polarizing plates whose detection directions are perpendicular to each other, and the stereoscopic image information can be observed. [Embodiment] 096136371 Form No. Α0101 Page 4 of 14 1003267165-0 1356191
100^.07¾ 22B 圆下&縣切圖，舉以下純實施例並配合圖式詳細描 ' 述如下。 [0011] 清參閱圖1及圖2，為本發明提供之第一實施例之立體投 影光學系統100之結構示意圖。該立體投影光學系統100 包括沿光路方向依次設置之一光源組件11 ' 一圖像吸收 器12、一設置於所述圖像吸收器12出射光路上之穿透式 光調制器14以及一投影鏡頭15。 [0012] 所述光源組件11包括依光路設置之一照明光源111、一色 輪112以及—積分器113。所述照明光源ill發射包括顯 示彩色圖像所需之紅光（1〇、綠光（G)及藍光（B)之白光 。該光源11可以為鹵素燈、金屬鹵化物燈、氙燈或LED等 。在本實施例中，該光源丨丨為南素燈。所述色輪U2包括 紅、綠、藍三色區’其可在電機（圖未示）的帶動下高速 旋轉’以給投影光路配以各種色彩。所述積分器113用來 &均勻化及有效地使用光源11發出之光。 [0013] 所述圖像吸收器12包括依光路設置之一偏振分束器121及 一反射式空間光調制器122。所述偏振分束器 (Polarization Beam Splitter, PBS) 121 用於將來 自光源元件11之非偏振光變成第一偏振光及第二偏振光 ，在本實施例中所第一偏振光為S偏振光，第二偏振光為 P偏振光。該S偏振光被該偏振分束器121反射，而P偏振 光透過該偏振分束器121。該偏振分束器121可以為金屬 柵格型偏振片（Wire Grid Polarizer，簡稱WGP偏振片 )，也可以為偏振分光棱鏡’在本實施例中，該偏振分束 器121為偏振分光棱鏡。該偏振分束器121根據對S偏振光 096136371 表單編號 A0101 第 5 頁/共 14 頁 1003267165-0 1356191 10+0+‘07月 ’修胃 和P偏振光之作用不同，可以分為反射S偏振光而透過卩偏 振光’與透過S偏振光而反射P偏振光兩種形式。在本實 施例中，所述偏振分束器23反射S偏振光，而可以讓P偏 振光透過。 [0014] 所述反射式空間光調制器122可以為矽基液晶（Liquid Crystal on Silicon, LCoS)顯示面板。該矽基液晶 顯示面板工藝結構結合了液晶技術與半導體積體電路技 術。LCoS面板利用半導體製程製作驅動面板，然後在電 晶體上採用研磨技術磨平，並鍍上鋁或銀等當作反射鏡 ，形成CMOS基板，再將CMOS基板與含有透明電極的玻璃 基板貼全後灌入液晶分子並封裝測試，形成LCoS面板。 LCoS面板通過控制光的偏振狀態來調制入射光並給入射 光加入空間訊息，形成包括該入射光及該空間訊息經過 調制之出射光。所述空間訊息可以為該LCoS所載入之控 制訊號電壓，該控制訊號電壓直接控制薄膜電晶體乏開 關狀態，再利用該薄膜電晶體來控制所述液晶分子之偏 轉狀態，而液晶分子具有明顯之光學各向異性，能夠控 制來自入射光之光線，從而實現為入射光載入圖像訊號 之目的。在本實施例中，該反射式空間光調制器122對S 偏振光進行調制並載入空間訊息，並將經調制及載入有 空間訊息之P偏振光反射出去，該P偏振光透過偏振分束 器121並發射出去。 [0〇15] 所述穿透式光調制器14可以為液晶顯示裝置（Liquid100^.073⁄4 22B Round & County Cut, the following pure examples are described in detail with the drawings below. 1 and FIG. 2, FIG. 2 is a schematic structural view of a stereoscopic projection optical system 100 according to a first embodiment of the present invention. The stereoscopic projection optical system 100 includes a light source assembly 11' disposed in the optical path direction, an image absorber 12, a transmissive light modulator 14 disposed on the exiting path of the image absorber 12, and a projection lens. 15. [0012] The light source assembly 11 includes an illumination source 111, a color wheel 112, and an integrator 113 disposed in accordance with the optical path. The illumination source ill emits white light including red light (1 〇, green light (G), and blue light (B)) required to display a color image. The light source 11 may be a halogen lamp, a metal halide lamp, a xenon lamp, or an LED. In this embodiment, the light source 丨丨 is a south lamp. The color wheel U2 includes red, green, and blue color zones 'which can be rotated at a high speed by a motor (not shown) to give a projection light path. The integrator 113 is used to & homogenize and effectively use the light emitted by the light source 11. [0013] The image absorber 12 includes a polarizing beam splitter 121 and a reflection disposed along the optical path. a spatial light modulator 122. The Polarization Beam Splitter (PBS) 121 is used to change the unpolarized light from the light source element 11 into the first polarized light and the second polarized light, which is the first in this embodiment. One polarized light is S-polarized light, and the second polarized light is P-polarized light. The S-polarized light is reflected by the polarizing beam splitter 121, and P-polarized light is transmitted through the polarizing beam splitter 121. The polarizing beam splitter 121 can be Metal Grid Polarizer (WGP polarizer) In the present embodiment, the polarization beam splitter 121 is a polarization beam splitter. The polarization beam splitter 121 is based on the pair of S-polarized light 096136371 Form No. A0101 Page 5 of 14 1003267165- 0 1356191 10+0+'07 month's stomach is different from P-polarized light, and can be divided into two forms: reflecting S-polarized light and transmitting 卩-polarized light and transmitting S-polarized light and reflecting P-polarized light. In an example, the polarizing beam splitter 23 can reflect the S-polarized light, and can transmit the P-polarized light. [0014] The reflective spatial light modulator 122 can be a liquid crystal on silicon (LCoS) display panel. The 矽-based liquid crystal display panel process structure combines liquid crystal technology and semiconductor integrated circuit technology. The LCoS panel uses a semiconductor process to fabricate the driving panel, and then is ground on the transistor by grinding technology, and is plated with aluminum or silver as reflection. Mirror, forming a CMOS substrate, and then affixing the CMOS substrate and the glass substrate containing the transparent electrode to the liquid crystal molecules and packaging and testing to form an LCoS panel. The LCoS panel controls the polarization of the light. The incident light is modulated and a spatial message is added to the incident light to form an outgoing light including the incident light and the spatial information modulated. The spatial information can be a control signal voltage loaded by the LCoS, and the control signal voltage directly controls the thin film. The transistor is in a switched state, and the thin film transistor is used to control the deflection state of the liquid crystal molecules, and the liquid crystal molecules have obvious optical anisotropy, and can control the light from the incident light, thereby loading the image into the incident light. The purpose of the signal. In this embodiment, the reflective spatial light modulator 122 modulates the S-polarized light and loads the spatial information, and reflects the P-polarized light modulated and loaded with the spatial information, and the P-polarized light transmits the polarization. The beamer 121 is emitted and emitted. [0〇15] The transmissive light modulator 14 may be a liquid crystal display device (Liquid
Crystal Dispaly，LCD)。通過為該穿透式光調制器14 輪入脈衝訊號來控制該穿透式光調制器14之開啟與截止 096136371 表單编號A0101 第6頁/共14頁 1003267165-0 I35j6191 100年07.为左B :修正替換頁 。如圖3所不，為輪入穿透式光調制器“之輸入訊號以及 相對於左右眼輸出光之偏振狀態之波形圖。在本實施例 中，所述穿透式光謂制器14按照圖3所示之輸入訊號波形 圖開啟或截止’從而交替為左右眼提供不同偏振方向的S 偏振光及P偏振光。當為該穿透式光調制器輪入該訊號時 ，邊穿透式光調制器14便可交替輪出§偏振光或p偏振光 以提供觀看者左右眼之不同偏振方向之光。可以理解的 是，該輸入訊號之週期係可以調整的。通過穿透式光調 制器14之開啟與截止可以控制所輸入偏振光之偏振方向 ，在本實施例中，輸入穿透式光調制器14的係p偏振光， 下以P偏振光為例，來說明該穿透式光調制器14的作用原 理。當然，可以想到的是，對S偏振光之作用係與p偏振 光相同。 [0016] 在该穿透式光調制器14開啟時，如圖1所示，該p偏振光 直接穿過該穿透式光調制器14而不會對該P偏振光之偏振 狀態進行調制。但是，在穿透式光調制器14截止時，如 圖2所示，就會對穿過之P偏振光進行調制，即把輸入之p 偏振光調制為S偏振光輸出，從而可以交替地為觀看者提 供左右眼之不同偏振方向之光。 [0017] 所述投影鏡頭15設置於穿透式光調制器14之出射光之光 路上，用於將出射光所形成之圖像放大，並將放大之圖 像投影到螢幕（圖未示）上。 [0018] 圖4為本發明提供之第二實施例之立體投影光學系統200 之結構示意圖。該立體投影光學系統200包括沿光路方向 依次設置之一光源組件21、一圖像吸收器22，一設置於 096136371 表單編號 A0101 第 7 頁/共 14 頁 100326Ή65-0 1356191 所述圖像吸收器22出射光略上 一投影鏡頭25。 年.07月.☆日接 之穿透式光調制器24以及 [0019] 該第二貫狍例興第 同在於所述圖像 22之組成結構不同，第二實施 收器 之圖像吸收器22包括一 偏振分東器221及一穿透式空p 匕枯 光調制器222。該穿透式 空間光調制器222可以為液晶& _ 穿逐八 "尔裝置（Liquid Crystal Dispaly， LCD) 。 所述变 . 遷式空間光調制器222通 過控制輸入光之偏振狀態來詷在丨 入射光並給入射光加入 空間訊息’形成包括該空間铀自 心之經過調制之出射光。 所述空間訊息可以為所料透式”光則彳以22所載乂 的控制訊號電壓，雜制訊_壓直接控制_電晶體 之開關狀態’制㈣薄_晶體來控制所錢晶分子 之偏轉狀態’而液晶分子具有明顯之光學各向異性能Crystal Dispaly, LCD). Controlling the opening and closing of the transmissive light modulator 14 by injecting a pulse signal into the transmissive light modulator 14 Form No. A0101 Page 6 of 14 Page 1003267165-0 I35j6191 100 years 07. Left B: Correct the replacement page. As shown in FIG. 3, it is a waveform diagram of the input signal of the wheel-in transmissive optical modulator and the polarization state of the output light with respect to the left and right eyes. In this embodiment, the transmissive photo-presponder 14 is The input signal waveform diagram shown in Figure 3 is turned on or off to alternately provide S-polarized light and P-polarized light of different polarization directions for the left and right eyes. When the transmitted light modulator is wheeled into the signal, the edge-transmission type The light modulator 14 can alternately rotate § polarized light or p-polarized light to provide light of different polarization directions of the left and right eyes of the viewer. It can be understood that the period of the input signal can be adjusted. The opening and closing of the device 14 can control the polarization direction of the input polarized light. In the present embodiment, the p-polarized light of the transmissive optical modulator 14 is input, and the P-polarized light is taken as an example to illustrate the transmissive mode. The principle of operation of the light modulator 14. Of course, it is conceivable that the effect on the S-polarized light is the same as that of the p-polarized light. [0016] When the transmissive light modulator 14 is turned on, as shown in FIG. P-polarized light passes directly through the transmissive light modulator 14 without modulating the polarization state of the P-polarized light. However, when the transmissive optical modulator 14 is turned off, as shown in FIG. 2, the P-polarized light passing through is modulated, that is, the input is The p-polarized light is modulated into an S-polarized light output, so that the viewer can alternately provide light of different polarization directions of the left and right eyes. [0017] The projection lens 15 is disposed on the optical path of the outgoing light of the transmissive light modulator 14. The image formed by the emitted light is enlarged, and the enlarged image is projected onto a screen (not shown). [0018] FIG. 4 is a perspective projection optical system 200 according to a second embodiment of the present invention. The stereoscopic projection optical system 200 includes a light source assembly 21, an image absorber 22, and an image absorber 22, which are disposed in the direction of the optical path, and are disposed at 096136371, Form No. A0101, Page 7 of 14 100326Ή65-0 1356191 The absorber 22 emits light slightly above the projection lens 25. The transmission of the transmissive light modulator 24 and the [0019] of the second embodiment are based on the composition of the image 22 Different, the second implementation of the receiver The image absorber 22 includes a polarization splitter 221 and a penetrating empty p 匕 dry light modulator 222. The transmissive spatial light modulator 222 can be a liquid crystal & _ through eight " Dispaly, LCD). The shifting spatial light modulator 222 controls the polarization state of the input light to entangle the incident light and add a spatial information to the incident light to form a modulated outgoing light comprising the uranium self-center of the space. The spatial information can be the desired type of "light", the control signal voltage contained in 22, the control signal of the transistor, the switching state of the transistor, and the thin crystal. Deflection state' and liquid crystal molecules have significant optical anisotropy energy
夠控制來自人射光之S線，從而實現為人射光栽入圖像 訊號之目的。在本實施例中，該所述穿透式空間光調制 器222對入射之S偏振光進行調制，並在所述s偏振光上疊 加空間訊息’以產生一包括空間訊息之出射光，即包括 有空間訊息之P偏振光。該P偏振光穿過該穿透式空間光 調制器222後發射出去。而該P偏振光或S偏振光在其他光 學元件如穿透式光調制器24中之傳輸光路相同。It is enough to control the S line from the human light, so as to achieve the purpose of planting the image signal for human light. In this embodiment, the transmissive spatial light modulator 222 modulates the incident S-polarized light and superimposes the spatial information ' on the s-polarized light to generate an outgoing light including a spatial message, that is, includes P-polarized light with spatial information. The P-polarized light is transmitted through the transmissive spatial light modulator 222 and emitted. The P-polarized or S-polarized light is transmitted in the same manner in other optical components such as the transmissive optical modulator 24.
[0020] 上述立體投影光學系統使用時可通過為穿透式光調制器 輸入訊號使得該穿透式光調制器具有開啟及截止兩個交 替之工作狀態，使得觀看者之左、右眼交替獲得不同偏 振狀態之影像，當該輸入訊號之頻率足夠快時，觀看者 之左右眼分別戴上檢偏方向相互垂直之兩片偏振片，就 096136371 表單編號A0101 第8頁/共Η頁 1003267165-0 ‘1356191 100年.07月22日修正替換頁 可以觀察到立體之圖像訊息。 [0021] 综上所述，本發明符合發明專利要件，爰依法提出專利 申請。惟，以上所述者僅為本發明之較佳實施方式，本 發明之範圍並不以上述實施方式為限，舉凡熟悉本案技 藝之人士援依本發明之精神所作之等效修飾或變化，皆 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】[0020] The stereoscopic projection optical system can be used to input signals to the transmissive optical modulator such that the transmissive optical modulator has two alternating working states of opening and closing, so that the left and right eyes of the viewer are alternately obtained. For images with different polarization states, when the frequency of the input signal is fast enough, the left and right eyes of the viewer wear two polarizing plates perpendicular to each other in the direction of the deviation, 096136371 Form No. A0101 Page 8/Total Page 1003267165-0 '1356191 100 years. July 22nd revised the replacement page to observe the stereo image information. [0021] In summary, the present invention complies with the requirements of the invention patent, and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application. [Simple description of the map]
[0022] 圖1係本發明第一實施例之立體投影光學系統在所述穿透 式光調制器開啟時之結構示意圖。 [0023] 圖2係本發明第一實施例之立體投影光學系統在所述穿透 式光調制器截止時之結構示意圖。 [0024] 圖3係圖1的所述穿透式光調制器之輸入訊號以及相對於 左右眼輸出之光之偏振狀態之波形圖。 [0025] 圖4係本發明提供之第二實施例之立體投影光學系統之結 構示意圖。 φ 【主要元件符號說明】 [0026] 立體投影光學系統：100、200 [0027] 光源組件：11、21 [0028] 照明光源：111 [0029] 色輪：11 2 [0030] 積分器：11 3 [0031] 圖像吸收器：12、22 096136371 表單編號A0101 第9頁/共14頁 1003267165-0 1356191 . ^. 100年.07月左日-修正齊被頁 [0032] 偏振分束器：121、221 [0033] 穿透式光調制器：14、24 [0034] 投影鏡頭：15、25 [0035] 反射式空間光調制器：122、222 096136371 表單編號A0101 第10頁/共14頁 1003267165-01 is a schematic structural view of a stereoscopic projection optical system according to a first embodiment of the present invention when the transmissive optical modulator is turned on. 2 is a schematic structural view of a stereoscopic projection optical system according to a first embodiment of the present invention when the transmissive optical modulator is turned off. [0023] FIG. 3 is a waveform diagram of input signals of the transmissive optical modulator of FIG. 1 and polarization states of light outputted with respect to the left and right eyes. 4 is a schematic structural view of a stereoscopic projection optical system according to a second embodiment of the present invention. Φ [Description of main component symbols] [0026] Stereoscopic projection optical system: 100, 200 [0027] Light source component: 11, 21 [0028] Illumination source: 111 [0029] Color wheel: 11 2 [0030] Integrator: 11 3 [0031] Image Absorber: 12, 22 096136371 Form No. A0101 Page 9 / Total 14 Page 1003267165-0 1356191 . ^. 100 years. 07 month left-correction page [0032] Polarization beam splitter: 121 221 [0033] Transmissive Light Modulator: 14, 24 [0034] Projection Lens: 15, 25 [0035] Reflective Spatial Light Modulator: 122, 222 096136371 Form No. A0101 Page 10 of 14 1003267165- 0