201109728 六、發明說明： 【發明所屬之技術領域】 本發明是關於一種影像顯示裝置，尤指一種同時包含投 影系統與頭戴式顯示器的整合式影像顯示裝置。 【先前技術】 隨著光學科技的不斷進步’投影機已廣泛地應用於各種 ® 場合。在一般的會議簡報等場合中，為了讓與會者能清楚了 解討論内容，主持人可以透過操作投影機將報告相關的内容 或圖表投射在顯示幕上，使得與會者能藉由觀看投射在顯示 幕上的資料清楚掌握報告的内容。再者投影機的使用範圍隨 著影音設備和儲存媒體的進步’例如高功率的音響，高儲存 容量的DVD等等，使得一般家庭也能在家中透過投影機搭 配著音響，藉由投影機投射出來的超大晝面享受如同電影院 •中身歷其境的視聽感受。這使得投影機的使用範圍逐漸普及 到一般家庭中。 除了上述的投影機，在家庭娛樂媒體系統中的扮演另一 重要角色的包括頭戴式顯示器。頭戴式顯示器(Head m〇unted display，HMD)是一種立體視覺顯示的光學產品，利用兩眼 視差的立體效果祝號，經過液晶顯示器，再經過光學組件分 別送到使用者的雙眼，而產生立體畫面。使用者戴在頭上的 201109728 頭戴式顯示器，兩眼錢用1小登幕，便能夠產生大影像 的立體效果，完全不受外界環境與空間場地的限制。目前頭 戴式顯示器通常用在擴增實境（augmented reality，)或是 虛擬實境(virtual reality，VR)系統，其可跟著使用者移動並能 當作-種輸人設備來接收使用者的反應。透過戴在使用者的 :::頭戴式顯示器，圖像和文字就可以加到使用者觀察周 遭W兑所產生的晝面上，而達到虛擬實境或是擴增實境的效 果。 然而’目相費市場上所使㈣投影設備與頭戴式顯示 器均為各自獨立的單元。若消費者需同時使用到具有投影效 果與頭戴式顯示器1 力㈣裝置，必需分別準備兩種不同的設 備’無論在準備與騎上均容易造成負擔與錢。因此，如 何提供-種體積小且同時具料似絲式顯示功能 的顯示裝置即為現今消費市場上一重要課題。 【發明内容】 因此本發明是揭露一種整合投影系統與頭戴式顯示器的 影像顯示模組，讓使用者可以更輕便的方式在一個顯示裝置 中享受投影系統與頭戴式顯示器的功能。 本發明較佳實施例是揭露一種影像顯示裝置，其包含一 影像處理單元’一投影系統(projecting SyStem); 一頭戴式顯 201109728 示器（head mounted display)，以及一切換鏡（switch mirror)設 於該投影系統及該頭戴式顯示器之間，並將影像處理單元所 投射出之光線切換至頭戴式顯示器或投影系統。 本發明另一實施例是揭露一種影像顯示裝置，其包含一 影像處理單元；一投影系統，·一頭戴式顯示器；以及一分光 鏡(beam splitter)設於該投影系統與該頭戴式顯示器之間，並 同時影像處理單元所投射出之光線切換至頭戴式顯示器及 籲投影系統。 【實施方式】 請參照第1圖，第1圖為本發明第一實施例之一影像顯 示裝置10之模組示意圖。本實施例所揭露的影像顯示裝置 10可用來投射立體3D畫面及一般2d晝面，以下以投射立 體畫面來進行說明。如第1圖所示，本發明的影像顯示裝置 • 10主要包含一影像處理單元12、一頭戴式顯示器14、一投 影系統16以及一切換鏡18設於頭戴式顯示器14與投影系 統16之間。其中，影像處理單元包含一光源2〇、一菱鏡 組22以及兩個矽基液晶（liquid crystal on silicon，LCoS)顯示 面板24°光源20主要提供影像顯示裝置1〇所需之光線，且 光源20可由發光二極體或高亮度燈泡等各種發光元件所組 成。菱鏡組22較佳設於光源2〇出口處，其包含一偏振光束 分光(P〇larizing beam splitter, PBS)鍍膜 26 將光源 20 所發出 201109728 的未極化(unpolarized)光線重新定義為P偏光與S偏光。定 義過的P偏光與S偏光再分別由兩個矽基液晶顯示面板24 反射至切換鏡18，然後由切換鏡18選擇將光線切換至頭戴 式顯示器14或投影系統16。 影像顯示裝置10中的頭戴式顯示器14主要包含至少一 偏光片組(polarizer group)28與一鏡片組30，其中偏光片組 28包含一偏光片66及透鏡68，而鏡片組30則包含一反射 鏡70與一透鏡72。偏光片組28中的偏光片66較佳將切換 ^ 鏡18投射過來的S偏光反射至透鏡68並進行聚焦，而鏡片 組30的反射鏡70則將偏光片66投射過來的P偏光反射至 透鏡72並進行聚焦。聚焦過的S偏光與P偏光會直接投影 到人眼32的視網膜上形成放大的虛像。 本實施例所揭露的投影系統16部分較佳為一微型投影機 (micro-projector)，且投影系統16主要由一投影鏡組34與一 φ 螢幕36所構成。如同頭戴式顯示器14投射光線的方式，S 偏光及Ρ偏光由切換鏡18切換至投影系統16後會經過投影 鏡組34然後再將晝面投射到螢幕36上供使用者觀賞。以本 實施例所投射出的3D晝面為例，當投射出的影像顯示在螢 幕36上時，周圍的觀眾可配戴3D立體眼鏡並透過眼鏡來欣 賞立體晝面。 6 201109728 值得/主意的是，—般在設計投影系統丨6與頭戴式顯示器 14時’光線亮度通常是一個重要的考量。對投影系統16而 5 ’光線越強’投影的流明亮度越高，投影的效果也越好’ 因此才又衫系統16通常需要較強的光源來投射出明亮的畫 面。相反地，頭戴式顯示器14透過偏光片28將光線傳遞至 人眼時則需要相對較弱的光線，以避免刺激或傷害眼睛，因 此本發明在整合投影系統16與頭戴式顯示器14時較佳利用 切換鏡18來傳送不同強度的光源至投影系統16或頭戴式顯 示器14。 因此依據本發明之一實施例，切換鏡18與頭戴式顯示器 14之間可設置一衰減片（attenuator)38，並藉由衰減片38來 調整頭戴式顯示器14所需要的光線強度。其中，衰減片38 可為一變化型衰減片（variable attenuator)，例如一個可依據 時間（如白天或夜晚）或環境(如室内或室外）來手動或配合一 #感測器而自動調整周遭光線強度的衰減片38,或是一個塗佈 在切換鏡18相對於頭戴式顯示器14之表面的光學薄膜。本 實施例所揭露的衰減片38雖較佳塗佈在切換鏡18表面，但 又可設置在頭戴式顯示器14的偏光片66上，亦即相對鄰近 使用者眼睛32處，此設置方式也屬本發明所涵蓋的範圍。 藉由衰減片38的設置’本發明可利用切換鏡18切換光 線至不同目標（如頭戴式顯示器14或投影系統16)的時候藉 201109728 由衰減片38來調整頭戴式顯示器14所接收的光線強度，例 如使反射至投影系統16的部分接收到相對較強的光線而反 射至頭戴式顯示器14的部分則接收到較弱的光線。另外需 注意的是，本實施例雖將衰減片38直接設置在切換鏡18的 表面，但不侷限於此配置方式，又可在切換鏡18上無論有 無衰減片的情況下另將衰減片38設置在頭戴式顯示器14的 偏光片66上，並藉此調整進入頭戴式顯示器14的光線強 度。此配置方式也屬本發明所涵蓋的範圍。 此外，除了利用衰減片38來調整頭戴式顯示器μ所接 收到的光線，本發明又可直接以切換鏡18本身來調整進入 頭戴式顯示器14或投影系統16的光源。舉例來說，本發明 可提t、個具有至少兩個反射表面的切換鏡18，且切換鏡 18的兩個表面分別具有不同的反射率，並藉由切換鏡㈣ f不同反射率的兩個表面來輕進人賴式顯示H I4及投 影系統16的光源，使投影系統16的部分純到相對較強的 光線而頭戴式顯示器14的部分接收到較弱的光線，如此即 可在不設置衰減器38的情況下達到同樣的效果，或者使衰 減器38呈選擇性的設置。 干第2圖’第2圖為本發明第二實施例之-影像顯 2 _之槟組示意圖。如同第一實施例所揭露的模組， 顯不裝置40主要包含一影像處理單元12、-頭戴式! 201109728 示器14、一投影系統16以及一切換鏡18設於頭戴式顯示器 I4與投影系統之間16。其中，影像處理單元12包含—光、原 20、一菱鏡組22以及兩個矽基液晶顯示面板24。 、 影像顯示裝置10中的頭戴式顯示器14主要包八_ 片組(polarizing plate)28與一鏡片組3〇,其中偏光片組包 含一偏光片66及透鏡68，而鏡片組3〇則包含一反射鏡川 與一透鏡72。偏光片組28中的偏光片66較佳將切換鏡工8 *投射過來的S偏光反射至透鏡68並進行聚焦，而鏡片組3〇 的反射鏡70則將偏光片66投射過來的p偏光反射至透鏡72 並進行聚焦。本實施例所揭露的投影系統16部分較佳為一 微型投影機（micro-proj ector)，且投影系統丨6主要由一投影 鏡組34與一螢幕36所構成。如同碩戴式顯示器14投射光 線的方式，S偏光及p偏光由切換鏡18切換至投影系統16 後會經過投影鏡組34然後再將晝面投射到螢幕36上供使用 •者觀賞。 在本實施例中，影像處理單元4〇中的光源2〇是連接一 光源控制單元48，包括一開關42、〜高壓電源44與-低壓 電源扑，並藉此控制光源2〇的強弱，使投影系統16或頭戴 式頁不器14接收到對應強度的光線。換句話說，若使用需 要，強光源的投影系統16，可由_ 42控制電源的電壓值 並提供較大的電流至光源2G，藉此傳遞較強的光線至投影系 201109728 則由開關 線至頭戴 統16。若使用需要較弱光源的頭戴式顯示器μ， 4 2提供較小的電流至光源2 〇，藉此傳遞較弱的 式顯示器14。 请參照第3圖’第3圖為本發明第三實施例之― 示裝置5G之模組示意圖。在本實施例中，影 $像顯 主要包含-影像處理單元12、一頭戴式顯示器14不二：50 系統16以及一分光鏡(beam splitter)52設於頭戴式顯_、=衫 與投影系統16之間。其中，影像處理單50元包含$一 τ态14 一愛鏡組22以及兩個矽基液晶顯示面板光源2〇 ^ 供影像顯示裝置50所需之光線，且光源20可由發光2 =提 或高亮度燈泡等各種發光元件所組成》菱鏡組22較隹設於 光源20出口處，其包含一偏振光束分光鍍膜％將光源 所發出的未極化光線重新定義為ρ偏光與S偏光。定義過的 Ρ偏光與S偏光再由兩個石夕基液晶顯示面板24反射至分光 鏡52，然後由分光鏡52同時將光線傳送至頭戴式顯示器14 及投影系統16’使頭戴式顯示器14及投影系統16可同時接 收到對應的影像。 換句話說，相較於上述第1、2圖兩個實施例中是以切換 鏡18來分別切換光線至頭戴式顯示器14或投影系統16,即 讓使用者僅能在一個時間内使用一種功能，而本實施例是以 分光鏡52來同時提供不同強度的光線至頭戴式顯示器14及 201109728 投影系統16，讓使用者在操作本影像顯示裝置50時可同時 享受到兩種不同的功能。其中，分光鏡52對應頭戴式顯示 器14與投影系統16的兩個表面分別具有適當的反射率與穿 透率，以分別提供頭戴式顯示器14與投影系統16予不同強 度的光線。此外，亦可選擇性再增設一衰減片以因應頭戴式 顯示器14之特性需求，此設置方式也屬本發明所涵蓋的範 圍。 ’請參照第4圖，第4圖為本發明第四實施例之一影像顯 示裝置60之模組示意圖。如同上述第三實施例，影像顯示 裝置60同樣包含一影像處理單元12、一頭戴式顯示器14、 一投影系統16以及一分光鏡52設於頭戴式顯示器14與投 影系統16之間。其中，影像處理單元12包含一光源20、一 菱鏡組22以及兩個矽基液晶顯示面板24。光源20主要提供 影像顯示裝置60所需之光線，且光源20可由發光二極體或 • 高亮度燈泡等各種發光元件所組成。菱鏡組22較佳設於光 源20出口處，其包含一偏振光束分光鍍膜26將光源20所 發出的未極化光線重新定義為P偏光與S偏光。定義過的P 偏光與S偏光再由兩個矽基液晶顯示面板24反射至分光鏡 52,然後由分光鏡52同時將光線傳送至頭戴式顯示器14及 投影系統16,使頭戴式顯示器14及投影系統16可同時接收 到對應的影像。 11 201109728 在本實施例中’頭戴式顯示器14與投影系統16較佳連 — 接至一光纖(optical fiber)62，並藉此控制兩.者的運作。另外， 光纖62較佳以遠端控制的方式來控制頭戴式顯示器14與投 影系統16，但不侷限於此，又可以依據產品需求以諸如 HDMI(高解析多媒體介面）訊號線等之其他實體連接或無線 傳輸等的方式來達成。換句話說，本發明可選擇以遠端遙控 或實體連接光纖62的方式來單獨控制頭戴式顯示器14、單 獨控制投影系統16或是同時控制頭戴式顯示器14及投影系 統16兩者。其次，為了加強影像顯示裝置6〇的整體影像品 # 質本發明又可設置一影像強化器（image enhancer)64並連 接光纖62’藉此提升投影系統16與頭戴式顯示器14所接收 到的影像品質。另外需注意的是，本實施例雖僅以光纖62 連接一個頭戴式顯示器14，但不侷限於此，又可依照使用者 的需求利用光纖同時控制複數個頭戴式顯示器及/或多個投 影系統，使多個使用者在同一個時段内同時享受到投影與頭 戴式顯示器的功能。最後需注意的是，上述實施例所揭露的魯 所有το件、模組的數目、大小、及相對位置等並不受到圖示 所限’圖示僅作為例示用途，其他可達到相同功能的配置亦 落在本發明的範疇中。 以上所述僅為本發明之較佳實施例，凡依本發明申請專 利fe圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。 12 201109728 ^ 【圖式簡單說明】 第1圖為本發明第一實施例之一影像顯示裝置之模組示意 圖。 第2圖為本發明第二實施例之一影像顯示裝置之模組示意 圖。 第3圖為本發明第三實施例之一影像顯示裝置之模組示意 圖。 第4圖為本發明第四實施例之一影像顯示裝置之模組示意 ®圖。 【主要元件符號說明】 10 影像顯示裝置 12 影像處理單元 14 頭戴式顯示器 16 投影系統 18 切換鏡 20 光源 22 菱鏡組 24 梦基液晶顯不面板 26 偏振光束分光鍍膜 28 偏光片組 30 鏡片組 32 人眼 34 投影鏡組 36 螢幕 38 衰減片 40 影像顯示裝置 42 開關 44 高壓電源 46 低電壓源 48 光源控制單元 50 影像顯示裝置 52 分光鏡 13 201109728 60 影像顯示裝置 62 光纖 64 影像強化器 66 偏光片 68 透鏡 70 反射鏡 72 透鏡 14BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an image display device, and more particularly to an integrated image display device including a projection system and a head mounted display. [Prior Art] With the continuous advancement of optical technology, projectors have been widely used in various ® applications. In the case of general conference presentations, etc., in order to allow participants to clearly understand the content of the discussion, the host can project the relevant content or chart on the display screen by operating the projector, so that the participant can view the projection on the display screen. The information on the report clearly understands the content of the report. Furthermore, the scope of use of projectors has progressed with audio-visual equipment and storage media, such as high-powered audio, high-capacity DVDs, etc., so that the average family can also match the sound through the projector at home, and project by projector. The oversized face is like the cinematic experience of the cinema. This has led to the widespread use of projectors in the general household. In addition to the projectors described above, other important roles in home entertainment media systems include head-mounted displays. Head m〇unted display (HMD) is a stereoscopic display optical product that uses the stereoscopic effect of two-eye parallax to pass through the liquid crystal display and then to the user's eyes through optical components. Produce a stereoscopic picture. The 201109728 head-mounted display worn by the user on the head, with a small screen for two eyes, can produce a stereoscopic effect of large images, completely independent of the external environment and space. Currently, head-mounted displays are commonly used in augmented reality or virtual reality (VR) systems, which can be moved by the user and can be used as input devices to receive users. reaction. By wearing the ::: head-mounted display on the user, the image and text can be added to the user's observation of the surface created by the W, to achieve virtual reality or augmented reality. However, (4) projection devices and head-mounted displays are separate units. If the consumer needs to use both the projection effect and the head-mounted display 1 (four) device, it is necessary to prepare two different devices separately', which is easy to cause burden and money both in preparation and riding. Therefore, how to provide a display device with a small size and a silk-like display function is an important issue in the current consumer market. SUMMARY OF THE INVENTION Accordingly, the present invention is directed to an image display module that integrates a projection system and a head mounted display, thereby allowing a user to enjoy the functions of a projection system and a head mounted display in a display device in a lighter manner. A preferred embodiment of the present invention discloses an image display device including an image processing unit 'projecting system'; a head mounted display; and a switch mirror. The projection system and the head mounted display switch the light projected by the image processing unit to the head mounted display or the projection system. Another embodiment of the present invention discloses an image display device including an image processing unit, a projection system, a head mounted display, and a beam splitter disposed on the projection system and the head mounted display. At the same time, the light projected by the image processing unit is switched to the head mounted display and the projection system. [Embodiment] Please refer to Fig. 1, which is a schematic diagram of a module of an image display device 10 according to a first embodiment of the present invention. The video display device 10 disclosed in this embodiment can be used to project a stereoscopic 3D picture and a general 2d face. The following description will be made by projecting a stereoscopic picture. As shown in FIG. 1 , the image display device 10 of the present invention mainly includes an image processing unit 12 , a head mounted display 14 , a projection system 16 , and a switching mirror 18 disposed on the head mounted display 14 and the projection system 16 . between. The image processing unit includes a light source 2〇, a prism group 22, and two liquid crystal on silicon (LCoS) display panels. The light source 20 mainly provides light required by the image display device 1 and the light source. 20 may be composed of various light-emitting elements such as a light-emitting diode or a high-intensity light bulb. The prism group 22 is preferably disposed at the exit of the light source 2, and includes a P〇larizing beam splitter (PBS) coating 26 to redefine the unpolarized light emitted by the light source 20 to 201109728 as P-polarized light. Polarized with S. The defined P-polarized and S-polarized light are again reflected by the two 矽-based liquid crystal display panels 24 to the switching mirror 18, and then switched by the switching mirror 18 to switch the light to the head mounted display 14 or the projection system 16. The head mounted display 14 of the image display device 10 mainly includes at least one polarizer group 28 and a lens group 30. The polarizer group 28 includes a polarizer 66 and a lens 68, and the lens group 30 includes a lens group 30. The mirror 70 is coupled to a lens 72. The polarizer 66 in the polarizer group 28 preferably reflects the S polarized light projected from the switching mirror 18 to the lens 68 and focuses, and the mirror 70 of the lens group 30 reflects the P polarized light projected from the polarizer 66 to the lens. 72 and focus. The focused S-polarized light and P-polarized light are directly projected onto the retina of the human eye 32 to form an enlarged virtual image. The portion of the projection system 16 disclosed in this embodiment is preferably a micro-projector, and the projection system 16 is mainly composed of a projection mirror group 34 and a φ screen 36. As the head-mounted display 14 projects light, the S-polarized and pupil-polarized light is switched by the switching mirror 18 to the projection system 16 and then passes through the mirror set 34 and then projected onto the screen 36 for viewing by the user. Taking the 3D face projected by this embodiment as an example, when the projected image is displayed on the screen 36, the surrounding viewer can wear the 3D stereo glasses and enjoy the stereoscopic face through the glasses. 6 201109728 It is worthwhile/intentional that when designing the projection system 丨6 and the head-mounted display 14, the brightness of the light is usually an important consideration. The higher the brightness of the projection system 16 and the higher the brightness of the projection, the better the projection effect. Therefore, the shirt system 16 usually requires a stronger light source to project a bright picture. Conversely, when the head mounted display 14 transmits light to the human eye through the polarizer 28, relatively weak light is required to avoid irritation or injury to the eyes, so the present invention integrates the projection system 16 with the head mounted display 14 The switching mirror 18 is utilized to deliver light sources of different intensities to the projection system 16 or the head mounted display 14. Therefore, in accordance with an embodiment of the present invention, an attenuator 38 can be disposed between the switching mirror 18 and the head mounted display 14, and the intensity of light required for the head mounted display 14 can be adjusted by the attenuating sheet 38. The attenuator 38 can be a variable attenuator, for example, one can automatically adjust the ambient light according to time (such as day or night) or environment (such as indoor or outdoor) manually or with a # sensor. The attenuating sheet 38 of strength, or an optical film coated on the surface of the switching mirror 18 relative to the head mounted display 14. The attenuator 38 disclosed in this embodiment is preferably applied to the surface of the switching mirror 18, but may be disposed on the polarizer 66 of the head mounted display 14, that is, relatively adjacent to the user's eyes 32. It is within the scope of the invention. By means of the setting of the attenuating sheet 38, the present invention can be used to adjust the light received by the head mounted display 14 by the attenuation sheet 38 by using the switching mirror 18 to switch the light to a different target (such as the head mounted display 14 or the projection system 16). Light intensity, such as that that is reflected to the portion of projection system 16 that receives relatively strong light and that is reflected to head mounted display 14, receives weaker light. In addition, in this embodiment, although the attenuating piece 38 is directly disposed on the surface of the switching mirror 18, the present invention is not limited to this configuration, and the attenuating piece 38 may be further disposed on the switching mirror 18 with or without the attenuating piece. It is disposed on the polarizer 66 of the head mounted display 14 and thereby adjusts the intensity of light entering the head mounted display 14. This configuration is also within the scope of the present invention. Moreover, in addition to utilizing the attenuator 38 to adjust the light received by the head mounted display [mu], the present invention can adjust the light source entering the head mounted display 14 or projection system 16 directly with the switching mirror 18 itself. For example, the present invention can provide a switching mirror 18 having at least two reflective surfaces, and the two surfaces of the switching mirror 18 respectively have different reflectivities, and by switching mirrors (four) f, two different reflectivities The surface illuminates the light source of the H I4 and projection system 16 so that part of the projection system 16 is pure to relatively strong light and the portion of the head mounted display 14 receives weaker light, so that The same effect is achieved with the attenuator 38 set, or the attenuator 38 is selectively set. FIG. 2 is a schematic view of a pen set according to a second embodiment of the present invention. As with the module disclosed in the first embodiment, the display device 40 mainly includes an image processing unit 12, a head-mounted type! 201109728, a projector 14, a projection system 16, and a switching mirror 18 are disposed on the head mounted display I4. 16 between projection systems. The image processing unit 12 includes a light, a primary 20, a prism group 22, and two fluorinated liquid crystal display panels 24. The head mounted display 14 in the image display device 10 mainly comprises a polarizing plate 28 and a lens group 3, wherein the polarizer group includes a polarizer 66 and a lens 68, and the lens group 3 includes A mirror is formed with a lens 72. The polarizer 66 in the polarizer group 28 preferably reflects the S-polarized light projected by the switching mirror 8* to the lens 68 and focuses, and the mirror 70 of the lens group 3 reflects the p-polarized light projected by the polarizer 66. Go to lens 72 and focus. The portion of the projection system 16 disclosed in this embodiment is preferably a micro-proj ector, and the projection system 主要 6 is mainly composed of a mirror set 34 and a screen 36. Just as the master display 14 projects the light, the S-polarized and p-polarized light is switched by the switching mirror 18 to the projection system 16 and then passes through the projection set 34 and then projected onto the screen 36 for viewing by the user. In this embodiment, the light source 2 in the image processing unit 4 is connected to a light source control unit 48, including a switch 42, a high voltage power supply 44 and a low voltage power supply, and thereby controlling the strength of the light source 2〇, so that Projection system 16 or headphone 14 receives light of corresponding intensity. In other words, if necessary, the projection system 16 of the strong light source can control the voltage value of the power supply by _42 and provide a larger current to the light source 2G, thereby transmitting stronger light to the projection system 201109728 from the switch line to the head. Dai Tong 16. If a head mounted display [mu] that requires a weaker source is used, 4 2 provides a lower current to the source 2, thereby passing the weaker display 14. Referring to Fig. 3, Fig. 3 is a schematic diagram of a module of the display device 5G according to a third embodiment of the present invention. In this embodiment, the video image display unit 12 includes a video processing unit 12, a head mounted display 14, a system 16 and a beam splitter 52 disposed on the headphone display system and the projection system. Between 16. Wherein, the image processing unit 50 includes $1 τ state 14 a love mirror group 22 and two 矽-based liquid crystal display panel light sources 2 供 for the light required by the image display device 50, and the light source 20 can be illuminated 2 = raised or high A plurality of light-emitting elements such as a brightness light bulb are formed. The prism group 22 is disposed at the exit of the light source 20, and includes a polarizing beam spectroscopic coating. The unpolarized light emitted by the light source is redefined as ρ-polarized light and S-polarized light. The defined Ρ-polarized and S-polarized light is then reflected by two Shiyake liquid crystal display panels 24 to the beam splitter 52, and then the beam splitter 52 simultaneously transmits the light to the head mounted display 14 and the projection system 16' to make the head mounted display 14 and projection system 16 can simultaneously receive corresponding images. In other words, compared with the above-mentioned first and second embodiments, the switching mirror 18 is used to switch the light to the head mounted display 14 or the projection system 16, respectively, so that the user can use only one type of time. The present embodiment uses the beam splitter 52 to simultaneously provide different intensities of light to the head mounted display 14 and the 201109728 projection system 16, allowing the user to enjoy two different functions while operating the image display device 50. . Wherein, the beam splitter 52 has appropriate reflectance and penetration ratio corresponding to the two surfaces of the head mounted display 14 and the projection system 16, respectively, to provide different brightness of the head mounted display 14 and the projection system 16, respectively. In addition, an attenuator can be selectively added to meet the characteristics of the head mounted display 14, which is also within the scope of the present invention. Please refer to FIG. 4, which is a block diagram of a video display device 60 according to a fourth embodiment of the present invention. As with the third embodiment described above, the image display device 60 also includes an image processing unit 12, a head mounted display 14, a projection system 16, and a beam splitter 52 disposed between the head mounted display 14 and the projection system 16. The image processing unit 12 includes a light source 20, a prism group 22, and two 矽-based liquid crystal display panels 24. The light source 20 mainly provides light required by the image display device 60, and the light source 20 may be composed of various light-emitting elements such as a light-emitting diode or a high-intensity light bulb. The prism group 22 is preferably disposed at the exit of the light source 20, and includes a polarizing beam splitting coating 26 to redefine the unpolarized light emitted by the light source 20 into P polarized light and S polarized light. The defined P polarized light and S polarized light are then reflected by two 矽-based liquid crystal display panels 24 to the beam splitter 52, and then the light splitter 52 simultaneously transmits the light to the head mounted display 14 and the projection system 16 to make the head mounted display 14 And the projection system 16 can simultaneously receive corresponding images. 11 201109728 In the present embodiment, the head mounted display 14 and the projection system 16 are preferably connected to an optical fiber 62, and thereby control the operation of both. In addition, the optical fiber 62 preferably controls the head mounted display 14 and the projection system 16 in a remotely controlled manner, but is not limited thereto, and may be other entities such as HDMI (High Resolution Multimedia Interface) signal lines according to product requirements. Connection or wireless transmission, etc. is achieved. In other words, the present invention can optionally control the head mounted display 14 individually, control the projection system 16 alone, or both the head mounted display 14 and the projection system 16 by remotely or physically connecting the optical fibers 62. Secondly, in order to enhance the overall image quality of the image display device 6 , the present invention can further provide an image enhancer 64 and connect the optical fiber 62 ′ to thereby enhance the projection system 16 and the head mounted display 14 . Image quality. In addition, in this embodiment, although only one head mounted display 14 is connected by the optical fiber 62, the present invention is not limited thereto, and the plurality of head mounted displays and/or multiple devices can be simultaneously controlled by the optical fiber according to the needs of the user. The projection system enables multiple users to enjoy the functions of the projection and head-mounted display simultaneously in the same time period. Finally, it should be noted that the number, size, relative position and the like of all the το, modules, etc. disclosed in the above embodiments are not limited by the illustrations. The illustrations are for illustrative purposes only, and other configurations that can achieve the same function. It also falls within the scope of the invention. The above description is only the preferred embodiment of the present invention, and all changes and modifications made to the patent application according to the present invention are intended to be within the scope of the present invention. 12 201109728 ^ [Simplified description of the drawings] Fig. 1 is a schematic block diagram of an image display apparatus according to a first embodiment of the present invention. Fig. 2 is a schematic block diagram showing an image display apparatus according to a second embodiment of the present invention. Fig. 3 is a schematic block diagram showing an image display apparatus according to a third embodiment of the present invention. 4 is a schematic diagram of a module of an image display device according to a fourth embodiment of the present invention. [Main component symbol description] 10 Image display device 12 Image processing unit 14 Head-mounted display 16 Projection system 18 Switching mirror 20 Light source 22 String mirror 24 Dream-based liquid crystal display panel 26 Polarized beam spectroscopic coating 28 Polarizer group 30 Lens group 32 Human eyes 34 Projection mirror 36 Screen 38 Attenuator 40 Image display device 42 Switch 44 High voltage power supply 46 Low voltage source 48 Light source control unit 50 Image display device 52 Beam splitter 13 201109728 60 Image display device 62 Fiber 64 Image intensifier 66 Polarized light Sheet 68 lens 70 mirror 72 lens 14