M314352 八、新型說明： 【新型所屬之技術領域】 本創作關於一種投影顯示裝置，尤其是關於一種可以消除鬼影的投影 顯不裝置。 【先A技術】 習知投影機10為了縮簡體積，通常會於光源11與光閥13之間設置稜 鏡組12，請參閱第1圖所示，係美國專利第5, 309,188號所揭示，其中光 藝源11提供的光束可經由稜鏡組12導引至光閥13,再藉由切換光閥13的微 鏡片陣列於不同狀態，以適當選擇進入投影鏡頭14之光束，當微鏡片切換 至開狀態(ON-state)，光束即入射進入投影鏡頭14 ;當微鏡片切換至平狀 態（flat-state)或關狀態(off-state)，光束即偏離投影鏡頭14。 請續參閱第1圖，當光閥13的微鏡片切換至平狀態，且光束入射至第 一稜鏡121的入射角小於其臨界角時，光束L1係直接穿透稜鏡組12入射 至光閥13，經光閥13反射至第二稜鏡122之第三表面1223，且在第二稜 _ 鏡122以及第一棱鏡121之間多次反射後，光束會再次經由第二稜鏡122 之第二表面1223入射至光閥13，利用光閥13反射光束至第二稜鏡122之 第-表面1221，再由第二稜鏡122之第一表面1221使光束入射至投影鏡頭 14，最後由投影辆14投射錢幕成像而形成鬼影。 請參閱第2圖，當光束之入射角度大於第-棱鏡121之臨界角時，光 束L2係由第棱鏡12ι之第二表面1212反射後依序經第一棱鏡之第 表面1211第二表面1213後，分別穿透第一棱鏡121以及第二棱鏡⑵， 直接入射至光閥13，藉由光閥13以反射至第二棱鏡122之第一表面肋 M314352 後，藉由投影鏡頭14投射在螢幕上成像而形成鬼影，然 “、、叩境j鬼影會使得 投影旦面產生暗畫面稍暗及左右亮度獨之财面之對比M314352 VIII. New description: [New technical field] This creation relates to a projection display device, and more particularly to a projection display device capable of eliminating ghost images. [First A technique] The conventional projector 10 is generally provided with a cymbal group 12 between the light source 11 and the light valve 13 in order to reduce the volume, as shown in Fig. 1, which is disclosed in U.S. Patent No. 5,309,188. The light beam provided by the optomechanical source 11 can be guided to the light valve 13 via the cymbal group 12, and the microlens array of the light valve 13 is switched to different states to appropriately select the light beam entering the projection lens 14, when the microlens Switching to the ON-state, the beam is incident into the projection lens 14; when the microlens is switched to a flat-state or off-state, the beam deviates from the projection lens 14. Referring to FIG. 1 , when the microlens of the light valve 13 is switched to the flat state, and the incident angle of the light beam incident on the first weir 121 is less than the critical angle thereof, the light beam L1 directly penetrates the group 12 and is incident on the light. The valve 13 is reflected by the light valve 13 to the third surface 1223 of the second crucible 122, and after being reflected multiple times between the second prism 122 and the first prism 121, the light beam is again passed through the second crucible 122 The second surface 1223 is incident on the light valve 13, and the light beam 13 is used to reflect the light beam to the first surface 1221 of the second crucible 122, and then the first surface 1221 of the second crucible 122 causes the light beam to be incident on the projection lens 14, and finally The projection vehicle 14 projects the money screen image to form a ghost. Referring to FIG. 2, when the incident angle of the light beam is greater than the critical angle of the first prism 121, the light beam L2 is reflected by the second surface 1212 of the second prism 1212 and sequentially passes through the second surface 1213 of the first surface 1211 of the first prism. Passing through the first prism 121 and the second prism (2) respectively, directly incident on the light valve 13, and being reflected by the light valve 13 to the first surface rib M314352 of the second prism 122, and projected on the screen by the projection lens 14. Image formation and ghosting, but ",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
度，故如何歸鬼影’以提高投影畫面品f，已騎界努力研發之 【新型内容】 $ W 本創作之—目的，係提供—種投麵轉置，_稜叙姻區輕 計，改變反縣束之光路徑，藉以修正雜散光束行進方向，消除投影畫面 之鬼影’進而提高對比度。 本創作之另-目的，係提供-種投賴稀置，藉由_吸光物質或 設置_麵或光學層，避免雜散光束之不當料，提高投影畫面顯示品 質。 .口口 為達成上述目的，本創作提供之投影顯示裝置包含一光源、一光閥及 -稜鏡組，稜鏡組具有-第—棱鏡及_第二稜鏡，其中第_稜鏡包括第一 入光面、第-出光面以及第-平面，且第—人光面及第_出光面之一端透 過-連接面而連接以形成-截角區域，第二棱鏡包括第二人光面、第二出 光面以及第二平面，光源產生之光束穿透稜鏡組後人射至棚，經光間再 订反射至第二出光面，而後透過第二人光面人射至一截角區域，並由截角 區域穿出第一入光面，以改變反射光束之光路徑，藉以修正雜散光束行進 方向，消除投影晝面之鬼影，進而提高對比度。 【實施方式】 有關本創作為達成上述目的，所採用之技術手段及其功效，茲舉二較 佳實施例，並配合圖示加以說明。 第一實施例： M314352 請參閱第3圖，本創作投影顯示裝置第一實施例之光路徑圖，投影 顯示裝置30包含一光源31、一光閥32、一稜鏡組33及一投影鏡頭34，稜 鏡組33設置於光源31及光閥32之間，其中，光源31係用以產生一光束 311，光閥32係由複數個微鏡片組成，用以調變光源31產生之光束311以 產生一影像光束，投影鏡頭34設置於影像光束之光路徑上，以將影像光束 投射於一榮幕（圖未示）上形成影像，棱鏡組33係以第一稜鏡331及第二 稜鏡332組成，第一稜鏡331包括第一入光面3311、第一出光面3312及第 一平面3313，第一入光面3311及第一出光面3312之一端分別連接於第一 平面3313之兩端，第一入光面3311及第一出光面3312之另一端透過一連 接面3316而連接，詳言之，第一入光面3311及第一出光面3312延伸後所 形成的夾角為一銳角，透過截去銳角以形成一截角區域3314。第一入光面 3311與第一平面3313相連接形成一銳角3315 ,第一出光面3312與第一平 面3313相連接形成一鈍角3317。第二稜鏡332包括第二入光面3321、第 一出光面3322及第二平面3223，第二入光面3321及第二出光面3322係分 设於第二平面3223之兩側，且第一出光面3312與第二入光面3321係平行 並於其間形成一空氣層，而第二出光面3322與第一平面3313位於同一平 面上，其中光源31係鄰近第一入光面3311設置，光閥32與投影鏡頭34 則分設於鄰近第二出光面3322與第二平面3323之位置。 本實施例投影顯示裝置3G之光路徑，係利用兩組光束？丨導系統，將 雜散光有效將至投影顯示裝置3G外部，其中—組光束料系統係由光源 31產生光束311，經第一入光面3311進入第一棱鏡33卜以特定角度入射 至第-出光面3312,光束311係穿透第二稜鏡332而由第二出光面3322穿 M314352 出後投射至調32，並經調32反射後形成·光束，再次由第二出光面 3322進入第二棱鏡332 ’部分影像光束穿過第二平面繼投射至投影鏡頭 34 ’其餘景;像光束311a則、於—全反射臨界肖度投射至第二平面綱，由 第二入光面3321穿出第二稜鏡332投射至截角區域3314，截角區域3314 材質係為空氣層介面，使光束直接穿透截角區域3314，不再反射至第二稜 鏡 332。 另—組光束引導系統係由光源31產生光束3H，以大於全反射臨界 角度入射至第-出光面3312,光束311經第一出光面逝反射至第一入光 面3311而後以大於一全反射臨界角度投射至第一入光面犯u與第一平面 3313形成之銳肖3315，藉以增加光束311由第一入光面則反射至第一 出光面3312之光路徑長度，且第一平面·與第二出光面顯係設於同 平面上’使光束於第一入光面3311與第一平面測3之間進行多次全反 射最後光束311自第-平面3313投射至第-出光面3312，再由第一出光 面3312投射至第一入光面3311，而後穿出第一稜鏡泊卜 本創作沿著雜散光束反射之光路徑，經由第一棱鏡331之截角區域 3314及銳角3315之设置，改變光束路徑，藉以修正雜散光束行進方向，達 到消除投影畫面鬼影之目的，進而提高影像對比度。 第二實施例： 續請參閱第4圖’本創作投影顯示裝置第二實施例之桃徑圖，本實 施例一上述第貫⑯例相同或相當之元件係標示同—圖號，而本實施例與 上述實施例不同之處在於：棱鏡組43係以第一稜鏡431及第二棱鏡伽組 成’第-稜鏡431係、以第-入光面4311、第—出光面及第一平面4313 M314352 組成，第一入光面4311及第一出光面4312之一端分別連接於第一平面4313 之兩端，第-入光面4311及第-出光面衝之另一端直接連接且形成一 銳角4314，於銳角4314之一側之表面塗佈黑色吸光物質43141，更詳細地 說’於第一出光面4312上且鄰近銳角4314處塗佈黑色吸光材質43141，第 二出光面4322與第一平面4313不在同一平面上，第一平面4313表面塗佈 黑色吸光物質43131。 本實施例投影顯示裝置40之光路徑，係光束411經第一入光面4311 進入第-稜鏡431，光束411以特定角度穿透第一出光面4312，再由第二 入光面4321進入第二稜鏡432，後光束411由第二出光面4322穿出，投射 至平行第二出光面4322之光閥42，並經光閥42反射後形成影像光束，且 再次進入第二稜鏡432之第二出光面4322，並以大於一全反射臨界角度投 射至鄰近銳角4314之區域，利用設置於銳角4314之一側表面之黑色吸光 物質43141，吸收由第二稜鏡432投射之雜散光束。 此外’當光束411以大於全反射臨界角度入射至第一出光面4312， 光束411b經第一出光面4312反射至第一入光面4311，而後以大於一全反 射臨界角度投射至第一平面4313時，利用第一平面4313塗佈的黑色吸光 物質43131，吸收由第一入光面43u反射之雜散光，避免雜散光束由第一 出光面4312再穿透至第二稜鏡432。 本創作利用第一稜鏡431表面塗佈之黑色吸光物質，吸收投影光束之 雜散光，避免雜散光束傳導至投影顯示裝置4〇後端，提高投影畫面顯示品 質。 另外’第一平面4313表面亦可設置粗糙表面43132(如第5圖）以將光 M314352 束411c散射’降低光束投射至第二稜鏡432之機率；或者，如第6圖，於 第-稜鏡431之第-平面4313與空氣層之間設置至少一光學層 43133 ，光 學層43133之折射率介於空氣層折射係數與第一稜鏡431折射係數之間， 由於折射率與人狀叫角成正比，因此光學層43133產生全反射之臨 界角度會大於第-平面·之臨界肖度，經此光學層43133配置減少雜散 光束全反射鱗，剌消除絲，提高郷晝面品質之目的。 以上所述者’僅為“方钱鉢_之姉實關，本創作之範 圍不限於該·佳實_，驗摘作所做_何變更，於稀離本創作 之精神下，皆屬本創作申請專利之範圍。 【圖式簡單說明】 第1圖顯示美國專利第5,3〇9，188號之鬼影形成示意圖。 第2圖顯示美國專利第5，觀188號之鬼影形成示意圖。 第3圖顯示本創作投影顯示裝置第—實施例之光路徑圖。 第4圖顯示本創作投影顯示裝置第二實施例之光路徑圖。 第5圖顯示本創作投影顯示裝置第—平面具有粗链表面之光路徑圖。 第6圖顯示本創作投影顯示裝置第一平面與空氣層之間具有光學層 路徑圖。 【主要元件符號說明】 30 ~ 投影顯示裝置 31 '~~— 光源 32、42 -------- —~------ 光閥 33、 43 — '~------ 1___ ' ——-_ 稜鏡組 --------—-__ 10 M314352 34 ^ 44 投影鏡頭 331 、 431 第一稜鏡 332 > 432 第二稜鏡 311^ 311a > 311b 光束 411a 、 411b 、 411c 光束 3311 > 4311 第一入光面 3312 、 4312 第一出光面 3313 、 4313 第一平面 3314 截角區域 3315 銳角 3316 連接面 3317 鈍角 3321 > 4321 第二入光面 3322 ^ 4322 第二出光面 3323 、 4323 第二平面 4314 銳角 4314卜 43131 吸光材質 43132 粗梭表面 43133 光學層 11Degree, so how to return to ghosts to improve the projection of the picture f, has been riding the world to work hard to develop [new content] $ W This creation - purpose, is to provide - a kind of face-to-face transposition, _ _ _ _ _ _ _ _ Change the light path of the anti-county beam to correct the direction of the stray beam and eliminate the ghosting of the projected image to improve the contrast. The other purpose of this creation is to provide a kind of reliance on the use of _ light absorbing materials or _ surface or optical layer to avoid stray light beam misconduct and improve the quality of the projected picture display. In order to achieve the above object, the projection display device provided by the present invention comprises a light source, a light valve and a 稜鏡 group, and the 稜鏡 group has a - prism and a second 稜鏡, wherein the _ 稜鏡 includes a light-incident surface, a first light-emitting surface, and a first-plane, and one of the first human light surface and the first light-emitting surface is connected through the connection surface to form a truncated region, and the second prism includes a second human surface, The second light-emitting surface and the second plane, the light beam generated by the light source passes through the 稜鏡 group and the person shoots the shed into the shed, and then re-reflects the light to the second light-emitting surface through the light, and then passes through the second person's glossy surface to a truncated area. And passing the first light-incident surface from the truncated region to change the light path of the reflected beam, thereby correcting the traveling direction of the stray beam, eliminating ghosting of the projected pupil surface, thereby improving the contrast. [Embodiment] With regard to the technical means and the effects of the present invention in order to achieve the above object, two preferred embodiments will be described with reference to the drawings. The first embodiment of the present invention is described in FIG. The 稜鏡 group 33 is disposed between the light source 31 and the light valve 32. The light source 31 is used to generate a light beam 311. The light valve 32 is composed of a plurality of micro lenses for modulating the light beam 311 generated by the light source 31. An image beam is generated, and the projection lens 34 is disposed on the light path of the image beam to project the image beam onto a glory (not shown) to form an image, and the prism group 33 is first 331 and second 稜鏡The first 稜鏡331 includes a first light incident surface 3311, a first light emitting surface 3312, and a first plane 3313. One end of the first light incident surface 3311 and the first light emitting surface 3312 are respectively connected to the first plane 3313. The other end of the first light-incident surface 3311 and the first light-emitting surface 3312 are connected through a connecting surface 3316. In detail, the angle formed by the first light-incident surface 3311 and the first light-emitting surface 3312 is an acute angle. By cutting off the acute angle to form a truncated area 3314. The first light incident surface 3311 is connected to the first plane 3313 to form an acute angle 3315. The first light exit surface 3312 is connected to the first flat surface 3313 to form an obtuse angle 3317. The second light-emitting surface 3321 includes a second light-incident surface 3321, a first light-emitting surface 3322, and a second light-emitting surface 3322. The second light-incident surface 3321 and the second light-emitting surface 3322 are respectively disposed on two sides of the second plane 3223, and are first. The light-emitting surface 3312 is parallel to the second light-incident surface 3321 and forms an air layer therebetween, and the second light-emitting surface 3322 is located on the same plane as the first plane 3313. The light source 31 is disposed adjacent to the first light-incident surface 3311. The valve 32 and the projection lens 34 are disposed adjacent to the second light-emitting surface 3322 and the second plane 3323. The light path of the projection display device 3G of this embodiment utilizes two sets of beams? The guiding system effectively transmits stray light to the outside of the projection display device 3G, wherein the group of beam material systems generates a light beam 311 from the light source 31, enters the first prism 33 through the first light incident surface 3311, and enters the first angle at a specific angle. The light exiting surface 3312, the light beam 311 passes through the second weir 332, and the second light exiting surface 3322 passes through the M314352 and is projected to the adjustment 32, and is reflected by the adjustment 32 to form a light beam, and again enters the second light exiting surface 3322. The prism 332' part of the image beam passes through the second plane and is then projected onto the projection lens 34's remaining scene; the image beam 311a is projected onto the second plane at the total reflection criticality, and the second entrance surface 3321 is passed through. The second 332 is projected to the truncated region 3314, and the truncated region 3314 is made of an air layer interface, so that the light beam directly penetrates the truncated region 3314 and is no longer reflected to the second crucible 332. The other group beam guiding system generates a light beam 3H from the light source 31, and is incident on the first light-emitting surface 3312 at a critical angle greater than the total reflection. The light beam 311 is reflected by the first light-emitting surface to the first light-incident surface 3311 and then greater than one total reflection. The critical angle is projected to the first light incident surface u and the sharp surface 3315 formed by the first plane 3313, thereby increasing the length of the light path of the light beam 311 reflected from the first light incident surface to the first light exit surface 3312, and the first plane· And the second light-emitting surface is disposed on the same plane. The light beam is multi-reflected multiple times between the first light-incident surface 3311 and the first plane 3, and the last light beam 311 is projected from the first plane 3313 to the first-light-emitting surface 3312. And projecting from the first light-emitting surface 3312 to the first light-incident surface 3311, and then passing through the light path reflected by the first beam, along the truncated region 3314 of the first prism 331 and the acute angle The setting of 3315 changes the beam path, thereby correcting the traveling direction of the stray beam, thereby eliminating the ghost of the projected picture, thereby improving the image contrast. EMBODIMENT OF THE PREFERRED EMBODIMENT: Referring to FIG. 4, a second embodiment of the present projection display device, the same or equivalent components of the first embodiment are labeled with the same figure number. The difference between the example and the above embodiment is that the prism group 43 is composed of the first 稜鏡 431 and the second prism gamma, the first 稜鏡 431 system, the first illuminating surface 4311, the first illuminating surface and the first plane. 4313 M314352, one end of the first light-incident surface 4311 and the first light-emitting surface 4312 are respectively connected to the two ends of the first plane 4313, and the first-into-light surface 4311 and the other end of the first light-emitting surface are directly connected and form an acute angle. 4314, a black light absorbing material 43141 is coated on the surface of one side of the acute angle 4314, and in more detail, a black light absorbing material 43141 is coated on the first light emitting surface 4312 and adjacent to the acute angle 4314, and the second light emitting surface 4322 and the first plane are coated. 4313 is not on the same plane, and the surface of the first plane 4313 is coated with a black light absorbing material 43131. In this embodiment, the light path of the projection display device 40, the light beam 411 enters the first 稜鏡431 through the first light incident surface 4311, and the light beam 411 penetrates the first light exit surface 4312 at a specific angle, and then enters the second light incident surface 4321. The second light 432, the rear light beam 411 is passed through the second light exiting surface 4322, and is projected to the light valve 42 parallel to the second light exiting surface 4322, and is reflected by the light valve 42 to form an image light beam, and enters the second 稜鏡432 again. The second light-emitting surface 4322 is projected to a region adjacent to the acute angle 4314 by a critical angle greater than a total reflection, and the stray light beam projected by the second ridge 432 is absorbed by the black light-absorbing substance 43141 disposed on one side surface of the acute angle 4314. . In addition, when the light beam 411 is incident on the first light-emitting surface 4312 at a critical angle greater than the total reflection, the light beam 411b is reflected by the first light-emitting surface 4312 to the first light-incident surface 4311, and then projected to the first plane 4313 at a critical angle greater than a total reflection. At this time, the black light absorbing material 43131 coated by the first plane 4313 absorbs the stray light reflected by the first light incident surface 43u to prevent the stray light beam from re-penetrating from the first light exiting surface 4312 to the second ridge 432. The creation utilizes the black light absorbing material coated on the surface of the first 431 to absorb the stray light of the projection beam, thereby preventing the stray light beam from being transmitted to the rear end of the projection display device 4, thereby improving the quality of the projected picture display. In addition, the surface of the first plane 4313 may also be provided with a rough surface 43132 (as shown in FIG. 5) to scatter the light M314352 beam 411c' to reduce the probability of the beam being projected onto the second volume 432; or, as shown in FIG. 6, the first edge At least one optical layer 43133 is disposed between the first plane 4313 of the mirror 431 and the air layer, and the refractive index of the optical layer 43133 is between the refractive index of the air layer and the refractive index of the first 稜鏡431, due to the refractive index and the angle of the humanoid In principle, the critical angle at which the optical layer 43133 produces total reflection is greater than the critical angle of the first plane. The optical layer 43133 is configured to reduce the total reflection scale of the stray beam, eliminate the filament, and improve the quality of the surface. The above mentioned 'is only the realm of Fang Qiang _, the scope of this creation is not limited to the jia _ _, the _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The scope of the patent application for creation. [Simple description of the drawing] Figure 1 shows the ghost formation of U.S. Patent No. 5,3,9,188. Figure 2 shows the ghost formation of U.S. Patent No. 5, View No. 188. Fig. 3 is a view showing a light path of the second embodiment of the present projection display device. Fig. 4 is a view showing a light path of the second embodiment of the present projection display device. The light path diagram of the thick chain surface. Fig. 6 shows the optical layer path diagram between the first plane and the air layer of the present projection display device. [Main component symbol description] 30 ~ Projection display device 31 '~~—Light source 32, 42 -------- —~------ Light valve 33, 43 — '~------ 1___ ' ——-_ 稜鏡 group -------- --- __ 10 M314352 34 ^ 44 Projection lens 331 , 431 first side 332 > 432 second side 311 ^ 311a > 311b light beam 411a , 411 b, 411c beam 3311 > 4311 first light incident surface 3312, 4312 first light exit surface 3313, 4313 first plane 3314 truncated area 3315 acute angle 3316 connecting surface 3317 obtuse angle 3321 > 4321 second light incident surface 3322 ^ 4322 Two light surface 3323, 4323 second plane 4314 acute angle 4314 cloth 43131 light absorption material 43132 rough shuttle surface 43133 optical layer 11