TWI446091B - Projection device with a structure of recycling light - Google Patents
Projection device with a structure of recycling light Download PDFInfo
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Description
本發明係關於一種投影裝置，特別係關於一種具有光線回收結構的投影裝置。 The present invention relates to a projection apparatus, and more particularly to a projection apparatus having a light recycling structure.
投影裝置係利用光學投影方式將影像投射至螢幕上。近幾年來，較常見的投影裝置為液晶顯示(Liquid Crystal Display，LCD)投影裝置、數位發光元件處理(Digital Light Processing，DLP)投影裝置以及矽基液晶(Liquid Crystal On Silicon，以下簡稱為LCOS)投影裝置。液晶顯示投影裝置因運作時光線係以穿透的方式通過液晶顯示面板，屬於穿透式投影機。而數位發光元件處理投影裝置與矽基液晶投影裝置則是靠光線以反射的方式進行投射，屬於反射式投影機。其中，液晶顯示投影裝置與矽基液晶投影裝置的所使用的光線皆為線性偏振(Linear Polarized)光。 The projection device projects the image onto the screen by optical projection. In recent years, the more common projection devices are liquid crystal display (LCD) projection devices, digital light processing (DLP) projection devices, and liquid crystal on silicon (hereinafter referred to as LCOS). Projection device. The liquid crystal display projection device passes through the liquid crystal display panel in a transparent manner during operation, and belongs to a transmissive projector. The digital light-emitting element processing projection device and the 矽-based liquid crystal projection device are projected by light rays in a reflective manner, and belong to a reflective projector. Among them, the light used by the liquid crystal display projection device and the 矽-based liquid crystal projection device is linear polarized light.
請參照「第1圖」，係為習知液晶顯示投影裝置或矽基液晶投影裝置中形成單一偏振光的系統示意圖。投影裝置90包括發光元件92、透鏡組93、偏極分光鏡94、面板95以及吸收元件99。發光元件92射出光線96，透鏡組93接收並射出光線96，偏極分光鏡94接收並分離穿越過透鏡組93的光線96為第一偏振光97與第二偏振光98。其中，第一偏振光97入射面板95，而第二偏振光98被吸收元件99吸收。因此，習知的投影 裝置90存在有發光元件所射出的光使用率不高的問題。 Please refer to FIG. 1 for a schematic diagram of a system for forming a single polarized light in a conventional liquid crystal display projection device or a germanium-based liquid crystal projection device. The projection device 90 includes a light emitting element 92, a lens group 93, a polarizing beam splitter 94, a panel 95, and an absorbing element 99. The light-emitting element 92 emits light 96, the lens group 93 receives and emits light 96, and the polarized beam splitter 94 receives and separates the light 96 passing through the lens group 93 into a first polarized light 97 and a second polarized light 98. Among them, the first polarized light 97 is incident on the panel 95, and the second polarized light 98 is absorbed by the absorbing member 99. Therefore, the conventional projection The device 90 has a problem that the light usage rate of the light-emitting element is not high.
為了解決上述問題，於中華民國公告號第I235874號揭露一種用於LCD/LCOS投影機之偏振轉換導光管元件，其包含有由四片側反射鏡組成之光通道，其截面為矩形，且具有一光入口端以及一光出口端；一前反射鏡，設於該光入口端，且該前反射鏡具有一開口，容許由一發光元件匯聚之光束入射至該光通道內；一延遲板(Retardation Plate)，設於該光通道內；以及一傾斜設置之偏振分光模組，具有一偏振光束分光平面，其以與該側反射鏡成約45度夾角組態傾斜設於該延遲板以及該光出口端之間。上述裝置可將垂直偏振光穿透以到達出口端，而平行偏振光則被反射回去，以提供單一偏振方向的光。但面對電子裝置微小化的時代，上述的偏振轉換導光管元件存在有體積過大且成本過高的問題。 In order to solve the above problem, a polarization conversion light pipe element for an LCD/LCOS projector is disclosed in the Republic of China Publication No. I235874, which comprises a light passage composed of four side mirrors, which has a rectangular cross section and has a light entrance end and a light exit end; a front mirror disposed at the light entrance end, and the front mirror has an opening for allowing a light beam concentrated by a light emitting element to be incident into the light channel; a retardation plate ( a polarizing beam splitting module disposed in the optical channel; and a polarized beam splitting module having a polarized beam splitting plane disposed at an angle of about 45 degrees with the side mirror to be disposed on the retarding plate and the light Between the exits. The above device can penetrate vertically polarized light to reach the exit end, while the parallel polarized light is reflected back to provide light in a single polarization direction. However, in the era of miniaturization of electronic devices, the above-described polarization conversion light pipe elements have a problem of excessive volume and high cost.
鑒於以上問題，本發明提供一種具有光線回收結構的投影裝置一方面提高光線的使用效率，另一方面亦解決習知投影裝置存在有體積過大且成本過高的問題。 In view of the above problems, the present invention provides a projection device having a light-recycling structure, on the one hand, improving the use efficiency of light, and on the other hand, solving the problem that the conventional projection device is excessively large and costly.
依據本發明所揭露之具有光線回收結構的投影裝置包括發光元件、遠心透鏡組、偏極分光單元以及反射元件。依據本發明的一實施例，發光元件具有發光點且射出光線。偏極分光單元接收穿過遠心透鏡組的光線且使光線中的第一偏振光投射於第一平面。反射元件係實質上配置於第一平面的位置且反射第一偏振光。被反射元件反射的第一偏振光入射至發光點且去極化，發光元件反射去極化的光線。 A projection apparatus having a light recycling structure according to the present invention includes a light emitting element, a telecentric lens group, a polarization splitting unit, and a reflective element. According to an embodiment of the invention, the light-emitting element has a light-emitting point and emits light. The polarization splitting unit receives the light passing through the telecentric lens group and projects the first polarized light in the light onto the first plane. The reflective element is disposed substantially at a location of the first plane and reflects the first polarized light. The first polarized light reflected by the reflective element is incident on the light-emitting point and depolarized, and the light-emitting element reflects the depolarized light.
依據本發明的另一實施例，偏極分光單元包括平板式偏極 分光鏡與第一柱狀鏡，平板式偏極分光鏡係接收穿過遠心透鏡組的光線且使光線中的第一偏振光穿過第一柱狀鏡而投射於反光元件，第一柱狀鏡配置於反射元件與平板式偏極分光鏡間。第一柱狀鏡與平板式偏極分光鏡夾四十五度角，第一柱狀鏡係收斂第一偏振光。 According to another embodiment of the present invention, the polarization splitting unit comprises a flat polarizer a beam splitter and a first columnar mirror, the plate polarized beam splitter receives light passing through the telecentric lens group and causes the first polarized light in the light to pass through the first cylindrical mirror and is projected onto the reflective element, the first column The mirror is disposed between the reflective element and the flat polarized beam splitter. The first columnar mirror and the flat-type polarizing beam splitter are at a forty-five degree angle, and the first columnar mirror converges the first polarized light.
依據本發明的又一實施例，具有光線回收結構的投影裝置另包括面板，面板包括光學有效面，偏振分光單元接收穿過遠心透鏡組的光線且使得光線中的第二偏振光投射於第二平面，該光學有效面係實質上配置於預定位置且接收第二偏振光，其中，預定位置係配置於第二平面或距離第二平面前後一特定距離內的位置。 According to still another embodiment of the present invention, a projection apparatus having a light recycling structure further includes a panel including an optical effective surface, the polarization beam splitting unit receiving light passing through the telecentric lens group and causing the second polarized light in the light to be projected to the second In plan, the optical effective surface is substantially disposed at a predetermined position and receives the second polarized light, wherein the predetermined position is disposed at the second plane or a position within a certain distance from the second plane.
依據本發明的再一實施例，遠心透鏡組另包括第二柱狀鏡，發光元件具有發光面，面板包括光學有效面。第二柱狀鏡係接收發光面所發出的光線並將發光面的第一長寬比調整成投射至光學有效面所需的第二長寬比。 According to still another embodiment of the present invention, the telecentric lens group further includes a second cylindrical mirror, the light emitting element has a light emitting surface, and the panel includes an optical effective surface. The second lenticular lens receives the light emitted by the illuminating surface and adjusts the first aspect ratio of the illuminating surface to a second aspect ratio required for projection to the optically active surface.
依據本發明所揭露之具有光線回收結構的投影裝置可藉由遠心透鏡組與反射元件的設置，將未入射至面板的第一偏振光反射回發光點且去極化，發光元件反射去極化光線，使去極化光線入射偏極分光單元後，去極化光線中的第二偏振光可入射至面板的光學有效面，進而提高光線的使用效率。接著，適當地將面板離焦(即面板配置於預定位置)以獲得均勻的第二偏振光。再者，當遠心透鏡組包括第二柱狀鏡時，第二柱狀鏡可將發光面的第一長寬比調整成光學有效面所需的第二長寬比，以避免浪費發光面所射出的光線。 The projection device with the light recovery structure according to the present invention can reflect the first polarized light not incident on the panel back to the light-emitting point and depolarize by the arrangement of the telecentric lens group and the reflective element, and the light-emitting element reflects the depolarization The light causes the depolarized light to enter the polarizing beam splitting unit, and the second polarized light in the depolarized light can be incident on the optical effective surface of the panel, thereby improving the light use efficiency. Next, the panel is appropriately defocused (ie, the panel is placed at a predetermined position) to obtain uniform second polarized light. Furthermore, when the telecentric lens group includes the second cylindrical mirror, the second cylindrical mirror can adjust the first aspect ratio of the light emitting surface to a second aspect ratio required for the optical effective surface to avoid wasting the light emitting surface. The light that is emitted.
以上關於本發明的內容說明及以下之實施方式的說明係用 以示範與解釋本發明的精神與原理，並且提供本發明的專利申請範圍更進一步的解釋。 The above description of the contents of the present invention and the following description of the embodiments are used. The spirit and principles of the present invention are exemplified and explained, and a further explanation of the scope of the patent application of the present invention is provided.
50‧‧‧第一出光面 50‧‧‧The first glazing
52‧‧‧第二出光面 52‧‧‧Second glazing
90‧‧‧投影裝置 90‧‧‧Projector
92、102、202、302‧‧‧發光元件 92, 102, 202, 302‧‧‧Lighting elements
93‧‧‧透鏡組 93‧‧‧ lens group
94‧‧‧偏極分光鏡 94‧‧‧polar polarizer
95、110、210、310‧‧‧面板 95, 110, 210, 310‧‧‧ panels
96、116、216、316‧‧‧光線 96, 116, 216, 316 ‧ ‧ rays
97、120、220、320‧‧‧第一偏振光 97, 120, 220, 320‧‧‧ first polarized light
98、122、222、322‧‧‧第二偏振光 98, 122, 222, 322‧‧‧ second polarized light
99‧‧‧吸收元件 99‧‧‧absorbing components
100、200、300‧‧‧具有光線回收結構的投影裝置 100, 200, 300‧‧‧projection device with light recovery structure
103、203、303‧‧‧發光點 103, 203, 303‧‧ ‧ luminous points
104、204、304‧‧‧遠心透鏡組 104, 204, 304‧‧‧ telecentric lens group
206‧‧‧四分之一波片 206‧‧‧ Quarter wave plate
108、208、308‧‧‧偏極分光單元 108, 208, 308‧ ‧ 偏polar splitting unit
1081、3081‧‧‧稜鏡 1081, 3081‧‧‧稜鏡
1101、2101、3101‧‧‧光學有效面 1101, 2101, 3101‧‧‧ optical effective surface
112、212、312‧‧‧反射元件 112, 212, 312‧ ‧ reflective elements
1201、2201、3201‧‧‧第一平面 1201, 2201, 3201‧‧‧ first plane
1221、2221、3221‧‧‧第二平面 1221, 2221, 3221‧‧‧ second plane
123、323‧‧‧去極化光線 123, 323‧‧‧Depolarized light
124、324‧‧‧投射面 124, 324‧‧‧ projection surface
140、240、340‧‧‧預定位置 140, 240, 340‧‧‧Predetermined location
2091‧‧‧平板型偏極分光鏡 2091‧‧‧Plate type polarized beam splitter
2092‧‧‧第一柱狀鏡 2092‧‧‧First cylindrical mirror
223‧‧‧圓偏振光 223‧‧‧Circularly polarized light
305‧‧‧基板 305‧‧‧Substrate
307‧‧‧發光面 307‧‧‧Lighting surface
313‧‧‧反射面 313‧‧‧reflecting surface
314‧‧‧發光層 314‧‧‧Lighting layer
315‧‧‧保護層 315‧‧‧protection layer
319‧‧‧第二柱狀鏡 319‧‧‧Second columnar mirror
L‧‧‧長度 L‧‧‧ length
W‧‧‧寬度 W‧‧‧Width
D、R、T‧‧‧特定距離 D, R, T‧‧‧ specific distance
第1圖係為習知液晶顯示投影裝置或矽基液晶投影裝置中形成單一偏振光的系統示意圖。 Fig. 1 is a schematic view showing a system for forming a single polarized light in a conventional liquid crystal display projection device or a germanium-based liquid crystal projection device.
第2A圖係為依據本發明所揭露之具有光線回收結構的投影裝置的一實施例光線入射的路徑示意圖。 2A is a schematic diagram of a path of light incidence according to an embodiment of a projection apparatus having a light recycling structure according to the present invention.
第2B圖係為依據本發明所揭露之具有光線回收結構的投影裝置的一實施例光線反射的路徑示意圖。 2B is a schematic diagram of a path of light reflection of an embodiment of a projection apparatus having a light recycling structure according to the present invention.
第2C圖係為依據第2A圖的投影面示意圖。 Fig. 2C is a schematic view of a projection surface according to Fig. 2A.
第3A圖係為依據本發明所揭露之具有光線回收結構的投影裝置的另一實施例光線入射的路徑示意圖。 FIG. 3A is a schematic diagram of a path of light incidence according to another embodiment of a projection apparatus having a light recycling structure according to the present invention.
第3B圖係為依據本發明所揭露之具有光線回收結構的投影裝置的另一實施例光線反射的路徑示意圖。 FIG. 3B is a schematic diagram of a path of light reflection of another embodiment of a projection apparatus having a light recycling structure according to the present invention.
第4A圖係為依據本發明所揭露之具有光線回收結構的投影裝置的又一實施例光線入射的路徑示意圖。 4A is a schematic diagram of a path of light incidence according to still another embodiment of a projection apparatus having a light recycling structure according to the present invention.
第4B圖係為依據本發明所揭露之具有光線回收結構的投影裝置的又一實施例光線反射的路徑示意圖。 FIG. 4B is a schematic diagram of a path of light reflection of still another embodiment of a projection apparatus having a light recycling structure according to the present invention.
第4C圖係為依據第4A圖的發光元件結構示意圖。 Fig. 4C is a schematic view showing the structure of a light-emitting element according to Fig. 4A.
第4D圖依據第4A圖的光學有效面示意圖。 Figure 4D is a schematic diagram of an optically effective surface according to Figure 4A.
請參照「第2A圖」與「第2B圖」，係分別為依據本發明所揭露之具有光線回收結構的投影裝置的一實施例光線入射與反射的路徑示意圖。具有光線回收結構的投影裝置100包括發光元件102、遠心透鏡組104、偏極分光單元108以及反射元件112。其中，發光元件102可為但不限於發光二極體，偏極分光單元108可為由二稜鏡1081所組成的偏極分光鏡，反射元件112可為但不限於反射鏡。舉例而言，偏極分光單元108亦可包括平板型偏極分光鏡與二第一柱狀鏡，此部分請容後詳述。 Please refer to "2A" and "2B", which are schematic diagrams of paths of light incidence and reflection, respectively, of an embodiment of a projection apparatus having a light recycling structure according to the present invention. The projection apparatus 100 having a light recycling structure includes a light emitting element 102, a telecentric lens group 104, a polarization splitting unit 108, and a reflective element 112. The light-emitting element 102 can be, but not limited to, a light-emitting diode. The polarized light splitting unit 108 can be a polarizing beam splitter composed of two turns 1081. The reflective element 112 can be, but not limited to, a mirror. For example, the polarizing beam splitting unit 108 may also include a flat polarizing beam splitter and two first cylindrical mirrors, which will be described later in detail.
在本實施例中，發光元件102(即發光二極體)包括發光點103且射出光線116。其中，遠心透鏡組104係可由多個透鏡所組成，在本實施例中，遠心透鏡組104可由四個凸透鏡所組成，但本實施例並非用以限定本發明，可依據實際需求進行調整。 In the present embodiment, the light-emitting element 102 (ie, the light-emitting diode) includes the light-emitting point 103 and emits light ray 116. The telecentric lens group 104 can be composed of a plurality of lenses. In this embodiment, the telecentric lens group 104 can be composed of four convex lenses. However, this embodiment is not intended to limit the present invention, and can be adjusted according to actual needs.
偏極分光單元108(即為由二稜鏡1081所組成的偏極分光鏡)接收並穿過遠心透鏡組108的光線116並使光線116中的第一偏振光120投射於第一平面1201，第二偏振光122投射於第二平面1221。在本實施例中，由於第一偏振光120係可為S型線性偏振光，第二偏振光122係可為P型線性偏振光，所以第一偏振光120係被偏極分光單元108反射，而第二偏振光122係穿過偏極分光單元108而不被反射，但本實施例並非用以限定本發明。也就是說，第一偏振光120亦可為P型線性偏振光，第二偏振光122亦可為S型線性偏振光，第一偏振光120係穿過偏極分光單元108而不被反射，第二偏振光122係被偏極分光單元108反射。其中，偏極分光單元108另可包括第一出光面50與第二出光面52，第一出光面50係為偏極分光單元108射出第一偏振光120的面，第二出光面52係為偏 極分光單元108射出第二偏振光122的面，第一出光面50至第一平面1201的距離可等於第二出光面52至第二平面1221的距離，但本實施例並非用以限定本發明。 The polarizing beam splitting unit 108 (ie, the polarizing beam splitter composed of the diodes 1081) receives and passes through the light rays 116 of the telecentric lens group 108 and projects the first polarized light 120 in the light rays 116 onto the first plane 1201. The second polarized light 122 is projected onto the second plane 1221. In this embodiment, since the first polarized light 120 can be S-type linearly polarized light and the second polarized light 122 can be P-type linearly polarized light, the first polarized light 120 is reflected by the polarized light splitting unit 108. While the second polarized light 122 passes through the polarizing beam splitting unit 108 without being reflected, this embodiment is not intended to limit the present invention. That is, the first polarized light 120 may also be P-type linearly polarized light, and the second polarized light 122 may also be S-type linearly polarized light, and the first polarized light 120 passes through the polarizing beam splitting unit 108 without being reflected. The second polarized light 122 is reflected by the polarization splitting unit 108. The polarizing beam splitting unit 108 may further include a first light emitting surface 50 and a second light emitting surface 52. The first light emitting surface 50 is a surface where the polarizing beam splitting unit 108 emits the first polarized light 120, and the second light emitting surface 52 is a surface. Partial The pole splitting unit 108 emits the surface of the second polarized light 122. The distance from the first light exiting surface 50 to the first plane 1201 may be equal to the distance from the second light emitting surface 52 to the second plane 1221. However, this embodiment is not intended to limit the present invention. .
反射元件112係實質上配置於第一平面1201的位置且反射第一偏振光120，被反射元件112反射的第一偏振光120入射到發光點103。更詳細地說，光線116被發光點103射出後穿過遠心透鏡組104與偏極分光單元108而分成第一偏振光120與第二偏振光122。第一偏振光120被反射元件112反射且轉換成去極化光線123，進而入射至發光點103。 The reflective element 112 is disposed substantially at a position of the first plane 1201 and reflects the first polarized light 120, and the first polarized light 120 reflected by the reflective element 112 is incident on the light-emitting point 103. In more detail, the light ray 116 is emitted by the light-emitting point 103 and passes through the telecentric lens group 104 and the polarization splitting unit 108 to be divided into the first polarized light 120 and the second polarized light 122. The first polarized light 120 is reflected by the reflective element 112 and converted into a depolarized light ray 123, which is incident on the light-emitting point 103.
在本實施例中，具有光線回收結構的投影裝置100另包括面板110，面板110可為矽基液晶面板，面板110包括光學有效面1101，光學有效面1101係配置於預定位置140並接收第二偏振光122，預定位置140係配置於第二平面1221上或距離第二平面1221一特定距離D內的位置。其中，特定距離D的大小與發光點103的狀態有關。舉例而言，當發光點103存在有於製程中所造成的缺陷，例如但不限於長晶時形成的缺陷，若將光學有效面1101實質上配置於第二平面1221上，則光學有效面1101會獲得具有缺陷的照明，此時須將光學有效面1101移至距離第二平面1221一特定距離D內的位置，使光學有效面1101所獲得的照明缺陷模糊或消失，但本舉例並非用以限定本發明。 In this embodiment, the projection device 100 having the light recycling structure further includes a panel 110, which may be a 矽-based liquid crystal panel, the panel 110 includes an optically effective surface 1101, and the optically effective surface 1101 is disposed at a predetermined position 140 and receives the second The polarized light 122 is disposed at a position on the second plane 1221 or within a certain distance D from the second plane 1221. The magnitude of the specific distance D is related to the state of the light-emitting point 103. For example, when the light-emitting point 103 has defects caused in the process, such as but not limited to defects formed during the growth of the crystal, if the optical effective surface 1101 is substantially disposed on the second plane 1221, the optical effective surface 1101 A defective illumination is obtained. At this time, the optical effective surface 1101 must be moved to a position within a certain distance D from the second plane 1221, so that the illumination defect obtained by the optical effective surface 1101 is blurred or disappeared, but this example is not used. The invention is defined.
需注意的是，面板110與反射元件112的配置位置與第一偏振光120與第二偏振光122的偏振型態有關。舉例而言，由於第一偏振光120為S型線性偏振光而被偏極分光單元108反射，所以反射元件112實質上配置於第一偏振光120被偏極分光單元108反射後聚焦的第一平面 1201上，而第二偏振光122為P型線性偏振光時，由於P型線性偏振光可直接穿過偏極分光單元108，所以第二偏振光122可直接穿過偏極分光單元108後而聚焦於第二平面1221上，光學有效面1101係配置於預定位置140，預定位置140係配置於第二平面1221上或距離第二平面1221一特定距離D內的位置，但本實施例並非用以限定本發明。 It should be noted that the arrangement positions of the panel 110 and the reflective element 112 are related to the polarization states of the first polarized light 120 and the second polarized light 122. For example, since the first polarized light 120 is S-type linearly polarized light and is reflected by the polarized light splitting unit 108, the reflective element 112 is substantially disposed in the first focus after the first polarized light 120 is reflected by the polarized light splitting unit 108. flat On the 1201, when the second polarized light 122 is P-type linearly polarized light, since the P-type linearly polarized light can directly pass through the polarizing beam splitting unit 108, the second polarized light 122 can directly pass through the polarizing beam splitting unit 108. Focusing on the second plane 1221, the optical effective surface 1101 is disposed at a predetermined position 140, and the predetermined position 140 is disposed on the second plane 1221 or a position within a certain distance D from the second plane 1221, but this embodiment is not used. To limit the invention.
發光元件102反射去極化光線123且使去極化光線123入射偏極分光單元108，並使去極化光線123中的第二偏振光120可穿過偏極分光單元108(即為由二稜鏡1081所組成的偏極分光鏡)而投射至面板110的光學有效面1101上，其中，去極化光線123所經過的路徑與光線116所經過的路徑相同，於此不加以繪製。 The illuminating element 102 reflects the depolarized ray 123 and causes the depolarized ray 123 to enter the polarizing beam splitting unit 108, and the second polarized light 120 of the depolarized ray 123 can pass through the polarizing beam splitting unit 108 (ie, by the second The polarized beam splitter consisting of 稜鏡1081 is projected onto the optically active surface 1101 of the panel 110, wherein the path through which the depolarized ray 123 passes is the same as the path through which the ray 116 passes, and is not drawn here.
由於上述具有光線回收結構的投影裝置100可藉由遠心透鏡組104、反射元件112與發光元件102間適當位置的配置，使得第一偏振光120去極化且可回到發光點103，進而增加回收光線的效率，其中，具有光線回收結構的投影裝置100所獲得的第二偏振光122亮度可為但不限於未設置反射元件112的投影裝置所獲得的第二偏振光亮度的1.2至1.3倍。再者，面板110的光學有效面1101可配置於預定位置140，使得投射至面板110的光學有效面1101上的第二偏振光122均勻化，以獲得均勻的照明。 Since the projection device 100 having the light-recovering structure can be configured by a position between the telecentric lens group 104, the reflective element 112 and the light-emitting element 102, the first polarized light 120 is depolarized and can be returned to the light-emitting point 103, thereby increasing The efficiency of recovering light, wherein the brightness of the second polarized light 122 obtained by the projection device 100 having the light recovery structure may be, but is not limited to, 1.2 to 1.3 times the brightness of the second polarized light obtained by the projection device not provided with the reflective element 112. . Moreover, the optically active surface 1101 of the panel 110 can be disposed at a predetermined location 140 such that the second polarized light 122 projected onto the optically active surface 1101 of the panel 110 is homogenized to achieve uniform illumination.
請參照「第3A圖」與「第3B圖」，係分別為依據本發明所揭露之具有光線回收結構的投影裝置的另一實施例光線入射與反射的路徑示意圖。具有光線回收結構的投影裝置200包括發光元件202、遠心透鏡組204、偏極分光單元208以及反射元件212。其中，發光元件202可為但不限於發光二極體，偏極分光單元208可包括平板式偏極分光鏡2091與二 第三柱狀鏡2092，反射元件212可為但不限於反射鏡。 Please refer to "3A" and "3B", which are schematic diagrams of paths of light incident and reflection, respectively, of another embodiment of a projection apparatus having a light recycling structure according to the present invention. The projection device 200 having a light recycling structure includes a light emitting element 202, a telecentric lens group 204, a polarization splitting unit 208, and a reflective element 212. The light emitting element 202 can be, but not limited to, a light emitting diode, and the polarizing beam splitting unit 208 can include a flat polarizing beam splitter 2091 and two. The third cylindrical mirror 2092, the reflective element 212 can be, but is not limited to, a mirror.
在本實施例中，發光元件202(即發光二極體)具有發光點203且射出光線216。偏極分光單元208接收並分離穿過遠心透鏡組204的光線216為第一偏振光220與第二偏振光222，且使得第一偏振光220具有第一平面2201，第二偏振光222具有第二平面2221。 In the present embodiment, the light-emitting element 202 (i.e., the light-emitting diode) has a light-emitting point 203 and emits light 216. The polarizing beam splitting unit 208 receives and separates the light 216 passing through the telecentric lens group 204 into the first polarized light 220 and the second polarized light 222, and causes the first polarized light 220 to have a first plane 2201, and the second polarized light 222 has a first Two planes 2221.
其中，偏極分光單元208包括平板式偏極分光鏡2091與二第一柱狀鏡2092，平板式偏極分光鏡2091係接收穿過遠心透鏡組204的光線216並使光線216中的第一偏振光220投射於第一平面2201，光線216中的第二偏振光222投射於第二平面2221。二第一柱狀鏡2092分別配置於反射元件212(即反射鏡)與平板式偏極分光鏡2091間及面板210與平板式偏極分光鏡2091間，二第一柱狀鏡2092分別與平板式偏極分光鏡2091夾四十五度角，二第一柱狀鏡2092間夾九十度角。二第一柱狀鏡2092係分別收斂第一偏振光220與第二偏振光222。 The polarizing beam splitting unit 208 includes a flat polarizing beam splitter 2091 and two first cylindrical mirrors 2092. The flat polarizing beam splitter 2091 receives the light 216 passing through the telecentric lens set 204 and makes the first of the light rays 216. The polarized light 220 is projected on the first plane 2201, and the second polarized light 222 in the ray 216 is projected on the second plane 2221. The first columnar mirrors 2092 are respectively disposed between the reflective element 212 (ie, the mirror) and the flat polarized beam splitter 2091 and between the panel 210 and the flat polarized beam splitter 2091, and the first first cylindrical mirror 2092 and the flat plate, respectively. The polarizing beam splitter 2091 is sandwiched by a forty-five degree angle, and the two first cylindrical mirrors 2092 are sandwiched by a ninety degree angle. The two first columnar mirrors 2092 converge the first polarized light 220 and the second polarized light 222, respectively.
在本實施例中，第一偏振光220係可為但不限於P型線性偏振光，第二偏振光222係可為但不限於S型線性偏振光。也就是說，第一偏振光220亦可為S型線性偏振光，第二偏振光222亦可為P型線性偏振光。 In this embodiment, the first polarized light 220 can be, but not limited to, P-type linearly polarized light, and the second polarized light 222 can be, but not limited to, S-type linearly polarized light. That is, the first polarized light 220 may also be S-type linearly polarized light, and the second polarized light 222 may also be P-type linearly polarized light.
在本實施例中，具有光線回收結構的投影裝置200另可包括四分之一波片206，四分之一波片206係可配置於發光元件202與偏極分光單元208間。在本實施例中，四分之一波片206可配置但不限於發光元件202與遠心透鏡組204間。 In this embodiment, the projection device 200 having the light recovery structure may further include a quarter wave plate 206, and the quarter wave plate 206 may be disposed between the light emitting element 202 and the polarizing beam splitting unit 208. In the present embodiment, the quarter wave plate 206 can be configured, but not limited to, between the light emitting element 202 and the telecentric lens group 204.
反射元件212係配置於第一平面2201上且反射第一偏振光 220，使得被反射元件212反射的第一偏振光220穿過遠心透鏡組204與四分之一波片206後轉換成圓偏振光223而回到發光點203。 The reflective element 212 is disposed on the first plane 2201 and reflects the first polarized light 220, the first polarized light 220 reflected by the reflective element 212 is passed through the telecentric lens set 204 and the quarter-wave plate 206, and then converted into circularly polarized light 223 to return to the light-emitting point 203.
在本實施例中，具有光線回收結構的投影裝置200另可包括面板210，面板210可為即矽基液晶面板。面板210包括光學有效面2101，光學有效面2101係實質上配置於預定位置240且接收第二偏振光222，預定位置220係配置於第二平面2221或距離第二平面2221前後一特定距離R內的位置。其中，特定距離R的大小與發光點203的狀態有關。 In this embodiment, the projection device 200 having the light recycling structure may further include a panel 210, which may be a germanium-based liquid crystal panel. The panel 210 includes an optical effective surface 2101. The optical effective surface 2101 is disposed substantially at a predetermined position 240 and receives the second polarized light 222. The predetermined position 220 is disposed in the second plane 2221 or within a specific distance R before and after the second plane 2221. s position. The magnitude of the specific distance R is related to the state of the light-emitting point 203.
發光元件202將圓偏振光223反射且使圓偏振光223再次穿過四分之一波片206，進而轉換成第二偏振光222而入射至面板210的光學有效面2101上，其中，圓偏振光223所經過的路徑與光線216所經過的路徑類似，於此不加以繪製。在實際狀態下，四分之一波片206也可不用設置於具有光線回收結構的投影裝置200中，因為第一偏振光220反射回發光點203的過程會自然進行去極化效應，使得被反射元件212反射的第一偏振光220轉換成去極化光線(未標示)，而去極化光線中的第二偏振光222可投射於面板210的光學有效面2101上。因此，可依據具有光線回收結構的投影裝置200的去極化效應來決定是否要加裝四分之一波片206。 The light-emitting element 202 reflects the circularly polarized light 223 and passes the circularly polarized light 223 again through the quarter-wave plate 206, and then into the second polarized light 222 to be incident on the optically effective surface 2101 of the panel 210, wherein the circular polarization The path through which light 223 passes is similar to the path through which light 216 passes, and is not drawn here. In the actual state, the quarter wave plate 206 may not be disposed in the projection device 200 having the light recycling structure, because the process of reflecting the first polarized light 220 back to the light emitting point 203 naturally performs the depolarization effect, so that The first polarized light 220 reflected by the reflective element 212 is converted into depolarized light (not labeled), and the second polarized light 222 of the depolarized light is projected onto the optically active surface 2101 of the panel 210. Therefore, whether or not the quarter wave plate 206 is to be attached can be determined according to the depolarization effect of the projection device 200 having the light recycling structure.
其中，需注意的是，面板210與反射元件212的配置位置與第一偏振光220與第二偏振光222的偏振型態有關。在本實施例中，由於第一偏振光220為S型線性偏振光而可被平板式偏極分光鏡2091反射後聚焦於第一平面2201，反射元件2122係配置於第一平面2201上，但本實施例並非用以限定本發明。也就是說，當第一偏振光220為P型線性偏振光時，反射元件212的配置位置隨之改變而配置於P型線性偏振光所聚焦 的平面上。由於上述具有光線回收結構的投影裝置200可藉由遠心透鏡組204、反射元件212與發光元件202間適當位置的配置，使得第一偏振光220可回到發光點203，進而增加回收第一偏振光220的效率。再者，面板210的光學有效面2101配置於預定位置240，使得投射至光學有效面2101上的第二偏振光222均勻化，以獲得均勻的照明。 It should be noted that the arrangement positions of the panel 210 and the reflective element 212 are related to the polarization states of the first polarized light 220 and the second polarized light 222. In this embodiment, since the first polarized light 220 is S-type linearly polarized light, it can be reflected by the flat polarized beam splitter 2091 and then focused on the first plane 2201, and the reflective element 2122 is disposed on the first plane 2201, but This embodiment is not intended to limit the invention. That is, when the first polarized light 220 is P-type linearly polarized light, the arrangement position of the reflective element 212 is changed and the P-type linearly polarized light is focused. On the plane. Since the projection device 200 having the light recovery structure can be disposed at an appropriate position between the telecentric lens group 204, the reflective element 212 and the light-emitting element 202, the first polarized light 220 can be returned to the light-emitting point 203, thereby increasing the recovery of the first polarization. The efficiency of light 220. Furthermore, the optically active surface 2101 of the panel 210 is disposed at a predetermined location 240 such that the second polarized light 222 projected onto the optically active surface 2101 is homogenized to achieve uniform illumination.
請參照「第4A圖」與「第4B圖」，係分別為依據本發明所揭露之具有光線回收結構的投影裝置的又一實施例光線入射與反射的路徑示意圖。具有光線回收結構的投影裝置300包括發光元件302、遠心透鏡組304、偏極分光單元308以及反射元件312。其中，發光元件302可為但不限於發光二極體，偏極分光單元308可為由二稜鏡型3081所組成的偏極分光鏡，反射元件312可為但不限於反射鏡。 Please refer to FIG. 4A and FIG. 4B, which are schematic diagrams of paths of light incident and reflection according to still another embodiment of a projection apparatus having a light recycling structure according to the present invention. The projection device 300 having a light recycling structure includes a light emitting element 302, a telecentric lens group 304, a polarization splitting unit 308, and a reflective element 312. The light-emitting element 302 can be, but not limited to, a light-emitting diode. The polarized light splitting unit 308 can be a polarizing beam splitter composed of a two-dimensional type 3081. The reflective element 312 can be, but not limited to, a mirror.
在本實施例中，發光元件302(即發光二極體)包括發光點303且發光點303射出光線316。請參照「第4A圖」與「第4C圖」，「第4C圖」係為依據「第4A圖」的發光元件結構示意圖。發光元件302具有基板305、反射面313、發光層314與保護層315，反射面313係配置於基板305上，發光層314配置於反射面313與保護層315間，且發光層314係包括多個發光點303。發光層314射出光線316並穿過保護層315而射出，反射面313將入射至反射面313的光線316反射並穿過保護層315而射出，保護層317與遠心透鏡組304連接，但本實施例並非用以限定本發明。其中，發光元件302另包括發光面307，發光面307係由多個發光點303所組成，發光面307係可為發光層314與保護層315的交接處，亦可為發光層314或保護層315中的任一面，且發光面307可為矩形面、方形面或不規則 面。在本實施例中，發光面307係為發光層314與保護層315的交接處且為方形面，但本實施例並非用以限定本發明。 In the present embodiment, the light-emitting element 302 (ie, the light-emitting diode) includes a light-emitting point 303 and the light-emitting point 303 emits light 316. Please refer to "4A" and "4C", and "4C" is a schematic diagram of the structure of the light-emitting element according to "4A". The light-emitting element 302 has a substrate 305, a reflective surface 313, a light-emitting layer 314, and a protective layer 315. The reflective surface 313 is disposed on the substrate 305, the light-emitting layer 314 is disposed between the reflective surface 313 and the protective layer 315, and the light-emitting layer 314 includes Light points 303. The light-emitting layer 314 emits the light 316 and exits through the protective layer 315. The reflective surface 313 reflects the light 316 incident on the reflective surface 313 and passes through the protective layer 315, and the protective layer 317 is connected to the telecentric lens group 304. The examples are not intended to limit the invention. The light-emitting element 302 further includes a light-emitting surface 307. The light-emitting surface 307 is composed of a plurality of light-emitting points 303. The light-emitting surface 307 may be a junction of the light-emitting layer 314 and the protective layer 315, or may be a light-emitting layer 314 or a protective layer. Any one of 315, and the light emitting surface 307 can be a rectangular surface, a square surface, or an irregular surface surface. In the present embodiment, the light-emitting surface 307 is a junction of the light-emitting layer 314 and the protective layer 315 and is a square surface, but this embodiment is not intended to limit the present invention.
請參照「第4A圖」與「第4B圖」，遠心透鏡組304係接收光線316。偏極分光單元308(即由二稜鏡3081所組成的偏極分光鏡)接收並分離穿過遠心透鏡組304的光線316為第一偏振光320與第二偏振光322，且使得第一偏振光320具有第一平面3201，第二偏振光322具有第二平面3221。反射元件312係配置於第一平面3201上且反射第一偏振光320，使反射元件312反射第一偏振光320且第一偏振光320轉換成去極化光線323，進而回到發光點303。 Referring to "FIG. 4A" and "FIG. 4B", the telecentric lens group 304 receives the light 316. The polarizing beam splitting unit 308 (ie, the polarizing beam splitter composed of the second 3081) receives and separates the light 316 passing through the telecentric lens group 304 into the first polarized light 320 and the second polarized light 322, and makes the first polarization Light 320 has a first plane 3201 and second polarized light 322 has a second plane 3221. The reflective element 312 is disposed on the first plane 3201 and reflects the first polarized light 320, so that the reflective element 312 reflects the first polarized light 320 and the first polarized light 320 is converted into the depolarized light 323, thereby returning to the light-emitting point 303.
在本實施例中，具有光線回收結構的投影裝置300更可以包括面板310，面板310可為矽基液晶面板。面板310包括光學有效面3101，光學有效面3101係實質上配置於預定位置340且接收第二偏振光322，預定位置340係配置於第二平面3221上或距離第二平面3221前後一特定距離T內的位置。其中，特定距離T的大小與發光點303的狀態有關。 In this embodiment, the projection device 300 having the light recycling structure may further include a panel 310, and the panel 310 may be a germanium-based liquid crystal panel. The panel 310 includes an optical effective surface 3101. The optical effective surface 3101 is substantially disposed at a predetermined position 340 and receives the second polarized light 322. The predetermined position 340 is disposed on the second plane 3221 or a specific distance T before and after the second plane 3221. The location inside. The magnitude of the specific distance T is related to the state of the light-emitting point 303.
光線316被發光點303射出後依序穿過遠心透鏡組304與偏極分光單元308而被分離成第一偏振光320與第二偏振光322，第二偏振光322被面板310的光學有效面3101所接收，第一偏振光320被反射元件312反射且第一偏振光320轉換成去極化光線323而入射至發光點303。在本實施例中，第一偏振光320係可為P型線性偏振光，第二偏振光322係可為S型線性偏振光。也就是說，第一偏振光320亦可為S型線性偏振光，第二偏振光322亦可為P型線性偏振光，需要注意的是，第一偏振光320與第二偏振光322的偏振型態會影響面板310與反射元件312的配置位置。 The light ray 316 is emitted by the light-emitting point 303 and sequentially passes through the telecentric lens group 304 and the polarization beam splitting unit 308 to be separated into the first polarized light 320 and the second polarized light 322. The second polarized light 322 is optically effective by the panel 310. Received by 3101, the first polarized light 320 is reflected by the reflective element 312 and the first polarized light 320 is converted into the depolarized light ray 323 to be incident on the light-emitting point 303. In this embodiment, the first polarized light 320 may be P-type linearly polarized light, and the second polarized light 322 may be S-type linearly polarized light. That is, the first polarized light 320 may also be S-type linearly polarized light, and the second polarized light 322 may also be P-type linearly polarized light. It should be noted that the polarization of the first polarized light 320 and the second polarized light 322 The profile affects the placement of the panel 310 and the reflective element 312.
發光元件302將去極化光線323反射且使去極化光線323入射偏極分光單元308，進而使去極化光線323中的第二偏振光322投射於光學有效面3101上。其中，去極化光線323所經過的路徑與光線316所經過的路徑相同，於此不加以繪製。 The light-emitting element 302 reflects the depolarized light 323 and causes the depolarized light 323 to enter the polarization splitting unit 308, thereby causing the second polarized light 322 of the depolarized light 323 to be projected onto the optical effective surface 3101. The path through which the depolarized light ray 323 passes is the same as the path through which the light ray 316 passes, and is not drawn here.
在本實施例中，遠心透鏡組304另可包括第二柱狀鏡319，發光元件302具有發光面307(請參照「第4C圖」)，第二柱狀鏡319能接收發光面307所發出的光線316並將發光面307的第一長寬比調整成光學有效面3101的第二長寬比，但本實施例並非用以限定本發明。舉例而言，請參照「第2C圖」、「第4A圖」、「第4B圖」、「第4C圖」與「第4D圖」，其中，「第2C圖」係為依據「第2A圖」的光學有效面示意圖，「第4D圖」係為依據「第4A圖」的光學有效面示意圖。當發光面(即多個發光點103所組成的面)的第一長寬比為一比一，且遠心透鏡組104未包括第二柱狀鏡時(即「第2A圖」的實施例)，投影至面板110的光學有效面1101之第二長寬比係為一比一(因為遠心透鏡組104以成像方式投射至光學有效面1101上)。 In this embodiment, the telecentric lens group 304 further includes a second cylindrical mirror 319, the light emitting element 302 has a light emitting surface 307 (refer to "4C"), and the second cylindrical mirror 319 can receive the light emitting surface 307. The light ray 316 adjusts the first aspect ratio of the light emitting surface 307 to the second aspect ratio of the optical effective surface 3101, but this embodiment is not intended to limit the present invention. For example, please refer to "2C", "4A", "4B", "4C" and "4D", where "2C" is based on "2A" The optical effective surface diagram and the "4D image" are schematic diagrams of the optical effective surface according to "Ath 4A". When the first aspect ratio of the light emitting surface (ie, the surface composed of the plurality of light emitting points 103) is one to one, and the telecentric lens group 104 does not include the second cylindrical mirror (ie, the embodiment of FIG. 2A) The second aspect ratio of the optical effective surface 1101 projected to the panel 110 is one to one (because the telecentric lens group 104 is imagewise projected onto the optically active surface 1101).
而當光學有效面3101的第二長寬比為十六比九時，可利用第二柱狀鏡319將發光面318之寬度W所射出的光線316收斂而長度L所射出的光線316依原來的光路徑(因未被第二柱狀鏡319收斂，即第二柱狀鏡319具有一維收斂光線的能力)投射至光學有效面3101上，使發光面307之第一長寬比(即一比一)轉變成光學有效面3101所需的第二長寬比(即十六比九)而投射至光學有效面3101上，且不會浪費發光面307所射出的光線316。其中，發光面307經遠心透鏡組304、偏極分光單元308而 成像於第二平面3221的投射面324面積可比光學有效面3101的面積大，發光面(即多個發光點103所組成的面)經遠心透鏡組104、偏極分光單元108而成像於第二平面1221的投射面124面積可比光學有效面1101的面積大，但本實施例並非用以限定本發明，可依據實際需求進行調整。 When the second aspect ratio of the optical effective surface 3101 is sixteen to nine, the second columnar mirror 319 can converge the light ray 316 emitted by the width W of the light emitting surface 318, and the light 316 emitted by the length L is original. The light path (because the second cylindrical mirror 319 converges, that is, the second cylindrical mirror 319 has a one-dimensional ability to converge light) is projected onto the optical effective surface 3101 such that the first aspect ratio of the light emitting surface 307 (ie, One to one) is converted to the second aspect ratio (i.e., sixteen to nine) required for the optical effective surface 3101 to be projected onto the optical effective surface 3101 without wasting the light 316 emitted by the light emitting surface 307. The light emitting surface 307 passes through the telecentric lens group 304 and the polarizing beam splitting unit 308. The area of the projection surface 324 formed on the second plane 3221 may be larger than the area of the optical effective surface 3101, and the light-emitting surface (ie, the surface composed of the plurality of light-emitting points 103) is imaged by the telecentric lens group 104 and the polarization splitting unit 108. The area of the projection surface 124 of the plane 1221 can be larger than the area of the optical effective surface 1101. However, this embodiment is not intended to limit the present invention, and can be adjusted according to actual needs.
依據本發明所揭露之具有光線回收結構的投影裝置可藉由遠心透鏡組與反射元件的設置，將第一偏振光去極化且反射回發光點，發光元件的反射面反射去極化光線，使得去極化光線中的第二偏振光可入射至面板的光學有效面，進而提高光線的使用率。接著，適當地配置面板的位置以獲得均勻照明。再者，當遠心透鏡組包括第二柱狀鏡時，第二柱狀鏡可接收發光面所射出的光，且將發光面的第一長寬比調整成光學有效面的第二長寬比，以避免浪費發光面所射出的光線。 The projection device with the light recovery structure according to the present invention can depolarize and reflect the first polarized light back to the light emitting point by the arrangement of the telecentric lens group and the reflective element, and the reflective surface of the light emitting element reflects the depolarized light. The second polarized light in the depolarized light can be incident on the optically effective surface of the panel, thereby increasing the utilization of the light. Next, the position of the panel is appropriately configured to obtain uniform illumination. Furthermore, when the telecentric lens group includes the second cylindrical mirror, the second cylindrical mirror can receive the light emitted by the light emitting surface, and adjust the first aspect ratio of the light emitting surface to the second aspect ratio of the optical effective surface To avoid wasting light from the luminous surface.
雖然本發明以前述的較佳實施例揭露如上，然其並非用以限定本發明，任何熟習相像技藝者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，因此本發明的專利保護範圍須視本說明書所附的申請專利範圍所界定者為準。 While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of patent protection of the invention is subject to the definition of the scope of the patent application attached to this specification.
50‧‧‧第一出光面 50‧‧‧The first glazing
52‧‧‧第二出光面 52‧‧‧Second glazing
100‧‧‧具有光線回收結構的投影裝置 100‧‧‧Projection device with light recovery structure
102‧‧‧發光元件 102‧‧‧Lighting elements
103‧‧‧發光點 103‧‧‧Lighting point
104‧‧‧遠心透鏡組 104‧‧‧ telecentric lens group
108‧‧‧偏極分光單元 108‧‧‧polar spectroscopic unit
1081‧‧‧稜鏡 1081‧‧‧稜鏡
110‧‧‧面板 110‧‧‧ panel
1101‧‧‧光學有效面 1101‧‧‧Optical effective surface
112‧‧‧反射元件 112‧‧‧reflecting elements
116‧‧‧光線 116‧‧‧Light
120‧‧‧第一偏振光 120‧‧‧First polarized light
1201‧‧‧第一平面 1201‧‧‧ first plane
122‧‧‧第二偏振光 122‧‧‧Second polarized light
1221‧‧‧第二平面 1221‧‧‧ second plane
140‧‧‧預定位置 140‧‧‧Predetermined location
D‧‧‧特定距離 D‧‧‧Specific distance
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| TWI446091B true TWI446091B (en) | 2014-07-21 |
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