TWI670558B - Projector - Google Patents
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- TWI670558B TWI670558B TW106142800A TW106142800A TWI670558B TW I670558 B TWI670558 B TW I670558B TW 106142800 A TW106142800 A TW 106142800A TW 106142800 A TW106142800 A TW 106142800A TW I670558 B TWI670558 B TW I670558B
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Abstract
一種投影機包括光源、均光元件、光閥及可透光的光學元件。光源可輸出照明光束，且均光元件、光閥及光學元件設於照明光束的行進路徑上。光學元件設於光閥及均光元件之間並位於照明光束的行進路徑上，光學元件的一表面上設有一濾光膜，且該濾光膜完全被照明光束所涵蓋。 A projector includes a light source, a light leveling element, a light valve, and a light transmissive optical component. The light source can output an illumination beam, and the light homogenizing element, the light valve and the optical element are disposed on the traveling path of the illumination beam. The optical component is disposed between the light valve and the light homogenizing element and is located on the traveling path of the illumination beam. A surface of the optical component is provided with a filter film, and the filter film is completely covered by the illumination beam.
Description
本發明關於一種投影機，本發明關於一種具有較佳畫面均勻度的投影機。 The present invention relates to a projector, and the present invention relates to a projector having better picture uniformity.
投影機投射出之畫面，因受到材質吸收或鏡片鍍膜等各種因素的影響容易造成RGB三種顏色的強度分布不一致，導致畫面色度均勻性不佳，例如中央區域的某一色光強度較強而四周該色光相對較弱。如此即無法符合色均規格要求，例如整個畫面白色色座標差異值需小於0.005的要求。當利用多台投影機拼接出一電視拼牆畫面時，會於接縫處更凸顯出畫面顏色均勻度不佳的問題，降低拼接畫面的整體品質及視效。 The image projected by the projector is affected by various factors such as material absorption or lens coating, which may cause the intensity distribution of the three colors of RGB to be inconsistent, resulting in poor uniformity of the chromaticity of the picture. For example, the intensity of a certain color in the central region is strong and surrounded. This color light is relatively weak. Therefore, the color average specification cannot be met. For example, the white color coordinate difference value of the entire screen needs to be less than 0.005. When a plurality of projectors are used to splicing a screen of a TV wall, the problem of poor color uniformity of the screen is highlighted at the seam, and the overall quality and visual effect of the stitched picture are reduced.
根據本發明的一個觀點，提供一種投影機，包括光源、均光元件、光閥及可透光的光學元件。光源可輸出照明光束，且均光元件、光閥及光學元件設於照明光束的行進路徑上。光學元件設於光閥及均光元件之間並位於照明光束的行進路徑上，光學元件的一表面上設有一濾光膜，且濾光膜完全被照明光束所涵蓋。 According to one aspect of the present invention, a projector is provided that includes a light source, a leveling element, a light valve, and a light transmissive optical element. The light source can output an illumination beam, and the light homogenizing element, the light valve and the optical element are disposed on the traveling path of the illumination beam. The optical component is disposed between the light valve and the light homogenizing element and is located on the traveling path of the illumination beam. A filter film is disposed on a surface of the optical component, and the filter film is completely covered by the illumination beam.
根據本發明的另一個觀點，提供一種投影機，包括設於照明光束的行進路徑上的一積分器、光閥、光學元件及濾光片。光學元件及濾光片設於光閥及積分器之間，且濾光片的有效濾光範圍小於濾光片所在位置的照明光束範圍。 According to another aspect of the present invention, a projector is provided comprising an integrator, a light valve, an optical element, and a filter disposed on a path of travel of the illumination beam. The optical component and the filter are disposed between the light valve and the integrator, and the effective filter range of the filter is smaller than the range of the illumination beam at the position of the filter.
根據本發明的上述觀點，藉由在光學元件表面上或不同光學元件之間，設置可濾除或減弱特定區域強度相對較強的色光的濾光結構，可改善畫面部分區域某顏色亮度過高，而與其他色光相較強度分布不均的問題，符合色均規格的要求。再者，當利用多台投影機拼接出一電視拼牆畫面時，因各個投影畫面具有良好的顏色均勻度，故拼接後的整體畫面顏色變化較為平順而具有較佳的視效。 According to the above aspect of the present invention, by providing a filter structure on the surface of the optical element or between different optical elements, which can filter out or weaken the color light having a relatively strong intensity in a specific region, the brightness of a certain color in the partial region of the screen can be improved. However, the problem of uneven intensity distribution compared with other color lights meets the requirements of color uniformity specifications. Furthermore, when a plurality of projectors are used to splicing a screen of a TV wall, since the respective projection screens have good color uniformity, the overall screen color after splicing changes smoothly and has a better visual effect.
為讓本發明更明顯易懂，以下用實施例，並配合所附圖式作詳細說明如下。 In order to make the invention more apparent, the following embodiments are described in detail with reference to the accompanying drawings.
1、2、3、4、5‧‧‧投影機 1, 2, 3, 4, 5‧‧‧ projector
10‧‧‧光源 10‧‧‧Light source
12‧‧‧均光元件 12‧‧‧Homogeneous components
12’‧‧‧積分器 12’‧‧‧ integrator
14‧‧‧轉向鏡 14‧‧‧ turning mirror
16‧‧‧光學元件 16‧‧‧Optical components
18‧‧‧支撐件 18‧‧‧Support
20‧‧‧濾光膜 20‧‧‧Filter film
20’‧‧‧濾光片 20’‧‧‧Filter
22‧‧‧光學元件 22‧‧‧Optical components
30‧‧‧光閥 30‧‧‧Light valve
I‧‧‧照明光束 I‧‧‧ illumination beam
L‧‧‧透鏡 L‧‧ lens
LS’‧‧‧出光面 LS’‧‧‧Glossy
N‧‧‧凹槽 N‧‧‧ groove
P‧‧‧周邊區塊 P‧‧‧ surrounding blocks
TS、LS‧‧‧迎光面 TS, LS‧‧‧ Yingguang
MR‧‧‧光線邊緣 MR‧‧‧Light edge
圖1繪述了本發明一實施例的投影機概要示意圖。 1 is a schematic diagram showing the outline of a projector according to an embodiment of the present invention.
圖2繪述了本發明另一實施例的投影機概要示意圖。 2 is a schematic diagram showing the outline of a projector according to another embodiment of the present invention.
圖3繪述了本發明另一實施例的投影機概要示意圖。 3 is a schematic diagram showing the outline of a projector according to another embodiment of the present invention.
圖4繪述了本發明另一實施例的投影機概要示意圖。 4 is a schematic diagram showing the outline of a projector according to another embodiment of the present invention.
圖5繪述了本發明另一實施例的投影機概要示意圖。 FIG. 5 is a schematic diagram showing the outline of a projector according to another embodiment of the present invention.
圖6A及圖6B分別顯示使用或未使用紅光濾鏡濾光的各色光強度區域分佈圖 6A and 6B respectively show the light intensity region distribution maps of the respective colors filtered with or without the red filter.
有關本發明前述及其他技術內容、特點與功效，在以下配合參考圖式的多個實施例的詳細說明中，將可清楚的呈現。另外，下列實施例中所使用的用語「第一」、「第二」是為了辨識相同或相似的元件而使用，且方向用語例如「前」、「後」等，僅是參考附加圖式的方向，並非用以限定所述元件。 The foregoing and other technical aspects, features and advantages of the present invention will be apparent from In addition, the terms "first" and "second" used in the following embodiments are used to identify the same or similar elements, and the directional terms such as "front", "back", etc. are merely referenced to additional drawings. The orientation is not intended to define the components.
請參閱圖1，圖1繪述了本發明一實施例的投影機的概要示意圖。投影機1中，依照明光束的行進路徑，依序包括有設於照明光束的行進路徑上的光源10、均光元件12、轉向鏡14、光學元件16、濾光膜20、光學元件22以及光閥30。光源10提供一照明光束I。光學元件22設於光閥30及均光元件12之間。 Please refer to FIG. 1. FIG. 1 is a schematic diagram of a projector according to an embodiment of the present invention. In the projector 1, according to the traveling path of the bright light beam, the light source 10 provided on the traveling path of the illumination light beam, the light homogenizing element 12, the turning mirror 14, the optical element 16, the filter film 20, the optical element 22, and the like are sequentially included. Light valve 30. Light source 10 provides an illumination beam I. The optical element 22 is disposed between the light valve 30 and the light homogenizing element 12.
於本具體實施例中，光源10可為傳統熱電光源、螢光燈、發光二極體、雷射發光二極體發光元件或其他可提供照明光的裝置或元件。於本例中，光源10為一經封裝且具有螢光粉的白光發光二極體發光模組。 In this embodiment, the light source 10 can be a conventional thermoelectric light source, a fluorescent lamp, a light emitting diode, a laser emitting diode light emitting element, or other device or component that can provide illumination light. In this example, the light source 10 is a packaged white light emitting diode light emitting module with phosphor powder.
於本發明中，「均光元件」12是指透鏡陣列(LENS ARRAY)、積分柱式(INTEGRATE ROD)、可轉動的稜鏡等可用於均、勻光的各式元件或模組。於本例中，均光元件12為一實心積分柱。 In the present invention, the "homogeneous element" 12 means a lens array (LENS ARRAY), an integral column type (INTEGRATE ROD), a rotatable crucible, or the like, which can be used for uniform or uniform light. In this example, the light homogenizing element 12 is a solid integrating column.
於本例中，轉向鏡14可為一平面、凹面或是凸面反射鏡；其反射表面可為非球面表面或為自由曲面。於本例中，轉向鏡為一平面反射鏡，可反射照明光。 In this example, the turning mirror 14 can be a planar, concave or convex mirror; its reflective surface can be an aspheric surface or a free curved surface. In this example, the turning mirror is a flat mirror that reflects the illumination.
本發明之「光學元件」用語，係指元件具有部份或全部可反射或穿透的材質所構成，通常包括玻璃或塑膠所組成。舉例來說，光學元件可以是透鏡、全反射稜鏡(TIR Prism)、反向全反射稜鏡組(RTIR Prism)、各種積分器、各種濾光片等。於本具體實施例中，光學元件16為一屈光度為正且至少可讓部份光線通過的雙凸透鏡。 The term "optical element" as used in the present invention means that the element has a part or all of a material that can be reflected or penetrated, and usually consists of glass or plastic. For example, the optical element can be a lens, TIR Prism, RTIR Prism, various integrators, various filters, and the like. In this embodiment, the optical element 16 is a lenticular lens having a positive diopter and at least a portion of the light passing therethrough.
於本具體實施例中，濾光膜20的型態並不限定，且不限於膜狀，其亦可以是黏附式濾光膜片、鍍膜、濾光件或經滲雜的光學表面、具有濾除特定波長能力的光學表面或元件等。於本例中，濾光膜20為可至少過濾 部份紅光範圍波長的光學鍍膜，惟濾光膜20能過濾的光線並不以紅色為限，而可為例如是藍光、綠光、UV、IR或是具有特定極性的光線亦可。 In this embodiment, the shape of the filter film 20 is not limited, and is not limited to a film shape, and may also be an adhesive filter film, a coating film, a filter member or a permeable optical surface, and has a filter. Optical surfaces or components other than a specific wavelength capability. In this example, the filter film 20 is at least filterable. The optical coating of a portion of the red light range wavelength, but the light filtered by the filter film 20 is not limited to red, but may be, for example, blue light, green light, UV, IR or light having a specific polarity.
於本具體實施例中，光學元件22可以是場鏡、由多枚稜鏡所組成的全內反射稜鏡(TIR PRISM)或是包括單一稜鏡的反向式全內反射稜鏡組(RTIR PRISM)。於本實施例中，光學元件22為一由兩枚全稜鏡所形成的全內反射稜鏡組，光學元件22的各入光面及出光面均為平面。 In this embodiment, the optical element 22 can be a field lens, a total internal reflection enthalpy (TIR PRISM) composed of a plurality of turns, or a reverse total internal reflection 稜鏡 group including a single ridge (RTIR). PRISM). In the present embodiment, the optical element 22 is a total internal reflection group formed by two full turns, and each of the light incident surface and the light exit surface of the optical element 22 are flat.
光閥(Light valve)30一詞已為投影產界廣泛使用，在此產業中大多可用來指一種空間光調變器(Spatial Light Modulator,SLM)中的一些獨立光學單元。所謂空間光調變器，含有許多獨立單元(獨立光學單元)，這些獨立單元在空間上排列成一維或二維陣列。每個單元都可獨立地接受光學信號或電學信號的控制，利用各種物理效應(泡克爾斯效應、克爾效應、聲光效應、磁光效應、半導體的自電光效應或光折變效應等)改變自身的光學特性，從而對照明在該複數個獨立單元的照明光束進行調製，並輸出影像光束。獨立單元可為微型反射鏡或液晶單元等光學元件。亦即，光閥可以是數位微鏡元件(Digital Micro-mirror Device,DMD)、矽基液晶面板(liquid-crystal-on-silicon panel,LCOS Panel)或是穿透式液晶面板等。 The term light valve 30 has been widely used in the projection industry and is used in the industry to refer to some of the individual optical units in a Spatial Light Modulator (SLM). A so-called spatial light modulator, comprising a plurality of independent units (independent optical units), which are spatially arranged in a one-dimensional or two-dimensional array. Each unit can independently control optical signals or electrical signals, and use various physical effects (Pockels effect, Kerr effect, acousto-optic effect, magneto-optic effect, self-electrooptic effect of semiconductor or photorefractive effect) to change itself. The optical characteristic is such that illumination of the illumination beam of the plurality of individual units is modulated and the image beam is output. The individual unit can be an optical component such as a micro mirror or a liquid crystal cell. That is, the light valve may be a Digital Micro-mirror Device (DMD), a liquid-crystal-on-silicon panel (LCOS Panel), or a transmissive liquid crystal panel.
而投影機是利用光學投影方式將影像投射至螢幕上的裝置，在投影機產業中，一般依內部所使用的光閥30的不同，將投影機分為陰極射線管(Cathode Ray Tube)式投影機、液晶顯示器(Liquid Crystal Display,LCD)式投影機、數位光投影機(Digital Light Projector,DLP)以及液晶覆矽(Liquid Crystal on Silicon,LCOS)投影機因投影機運作時光線會透過LCD面板作為光閥，所以屬於穿透式投影機，而使用LCOS、DLP等光閥的投影機，則 是靠光線反射的原理顯像，所以稱為反射式投影機。而於本實施例中，投影機為數位光投影機，而光閥30為數位微鏡元件(DMD)。 The projector is a device that projects an image onto a screen by optical projection. In the projector industry, the projector is generally classified into a cathode ray tube (Cathode Ray Tube) projection depending on the light valve 30 used internally. Liquid crystal display (LCD) projectors, Digital Light Projector (DLP), and Liquid Crystal on Silicon (LCOS) projectors that pass through the LCD panel when the projector is operating As a light valve, it is a penetrating projector, and a projector using a light valve such as LCOS or DLP is It is developed by the principle of light reflection, so it is called a reflective projector. In the present embodiment, the projector is a digital light projector, and the light valve 30 is a digital micromirror device (DMD).
於本實施例中，照明光束I經光閥30轉換為影像光束後會經由光學元件22輸出，而濾光膜20在設置於影像光束的行進路徑外時，其較不會影響影像光束的成像，為較佳之設計。濾光膜20可設置在光學元件22(全反射稜鏡)的一入光表面處。如圖1所示，光源10發出的照明光束I經由均光元件12均勻化後，穿過透鏡L，經由濾光膜20進入全內反射稜鏡22投射至光閥30。濾光膜20可提供濾除或減弱特定色光的效果，若有畫面某區域色光強度過高而周邊較弱的問題，設置於全內反射稜鏡22表面上的濾光膜20可減弱該色光於該區域的強度，改善投影畫面色光強度分布不均的問題。 In this embodiment, the illumination beam I is converted into an image beam by the light valve 30 and then output through the optical element 22, and the filter film 20 does not affect the imaging of the image beam when disposed outside the traveling path of the image beam. For better design. The filter film 20 may be disposed at a light incident surface of the optical element 22 (total reflection 稜鏡). As shown in FIG. 1, the illumination beam I emitted by the light source 10 is homogenized via the homogenizing element 12, passes through the lens L, enters the total internal reflection 经由22 via the filter film 20, and is projected to the light valve 30. The filter film 20 can provide the effect of filtering out or attenuating the specific color light. If there is a problem that the intensity of the light in a certain area of the screen is too high and the periphery is weak, the filter film 20 disposed on the surface of the total internal reflection 稜鏡 22 can weaken the color light. The intensity of the region improves the uneven distribution of the intensity of the projected light.
舉例而言，若投影機1投射出的畫面中心紅光較強而周邊紅光較弱，可使用例如紅光濾鏡(dichroic mirror-RED)濾除或減弱由中央部分通過全內反射稜鏡22並進入光閥30的紅光，提高畫面整體的顏色均勻性。 For example, if the center of the picture projected by the projector 1 is strong in red and the surrounding red light is weak, for example, a dichroic mirror-RED can be used to filter or weaken the total internal reflection from the central portion. 22 and enter the red light of the light valve 30 to improve the color uniformity of the entire screen.
圖2繪述了本發明另一實施例的投影機的概要示意圖。於本實施例中，投影機2的一濾光膜20可設置在透鏡L的一迎光面LS且位於照明光束I的行進路徑上。於圖2中僅示意繪出單一透鏡L，但熟習本領域之技藝者當能理解均光元件12與光閥30間可設有複數透鏡，且設有濾光膜20的光學元件22可為這些透鏡中最靠近光閥30或全內反射稜鏡22的透鏡L。設於透鏡L的迎光面LS的濾光膜20同樣可以反射、吸收或波長轉換等手段來過濾或減弱特定區域強度相對較強的色光，使進入光閥不同區域的光線顏色均勻。需注意濾光膜20於透鏡L上的形成位置並不限定，於另一 實施例中，濾光膜20亦可形成於透鏡L的出光面LS’，或同時形成於迎光面LS及出光面LS’上的不同區域。 2 is a schematic diagram of a projector according to another embodiment of the present invention. In the present embodiment, a filter film 20 of the projector 2 can be disposed on a light-facing surface LS of the lens L and on the traveling path of the illumination light beam I. Only a single lens L is schematically illustrated in FIG. 2, but those skilled in the art can understand that a plurality of lenses can be disposed between the light-emitting element 12 and the light valve 30, and the optical element 22 provided with the filter film 20 can be Among these lenses, the lens L closest to the light valve 30 or the total internal reflection 稜鏡22. The filter film 20 disposed on the light-incident surface LS of the lens L can also reflect, absorb, or wavelength-convert the color light of a relatively strong intensity in a specific region, so that the color of light entering different regions of the light valve is uniform. It should be noted that the formation position of the filter film 20 on the lens L is not limited, and the other is In the embodiment, the filter film 20 may be formed on the light-emitting surface LS' of the lens L or at different regions on the light-incident surface LS and the light-emitting surface LS'.
於上述的實施例中，設置於光學元件22表面的濾光膜20可完全被照明光束I所涵蓋。舉例而言，如圖1及圖2所示，設置於光學元件22表面的濾光膜20完全落入均光元件12所發出的光束的最外邊緣MR所界定的區域範圍內。亦即若照明光束I於濾光膜20沿垂直光軸方向的延伸平面形成一投射區域，投影區域的邊沿MR如圖1、2所繪示。濾光膜20會完全落入該投射區域內，且濾光膜20的整體面積會小於照明光束I在濾光膜20位置的投射區域的面積。 In the above embodiment, the filter film 20 disposed on the surface of the optical element 22 can be completely covered by the illumination beam I. For example, as shown in FIGS. 1 and 2, the filter film 20 disposed on the surface of the optical element 22 completely falls within the region defined by the outermost edge MR of the light beam emitted by the light homogenizing element 12. That is, if the illumination beam I forms a projection area on the extending plane of the filter film 20 in the direction perpendicular to the optical axis, the edge MR of the projection area is as shown in FIG. The filter film 20 will completely fall into the projection area, and the overall area of the filter film 20 will be smaller than the area of the projection area of the illumination beam I at the position of the filter film 20.
圖3繪述了本發明另一實施例的投影機的概要示意圖。於本實施例中，投影機3包括有光源10、積分器12’、透鏡L、濾光片20’、全內反射稜鏡22及光閥30、。 3 is a schematic diagram of a projector according to another embodiment of the present invention. In the present embodiment, the projector 3 includes a light source 10, an integrator 12', a lens L, a filter 20', a total internal reflection 稜鏡22, and a light valve 30.
本發明之「積分器」12’用語或稱光積分器，可用於光線的均勻化。積分器可分為兩種型式，即透鏡陣列(LENS ARRAY)或積分柱式(INTEGRATE ROD)。積分柱式光積分器可以是中空或非中空構造的杆、柱狀積分器。而透鏡陣列式積分器可以是一複眼透鏡。於本例中，積分器12’為一實心積分柱。 The term "integrator" 12' of the present invention, or an optical integrator, can be used to homogenize light. The integrator can be divided into two types, LENS ARRAY or INTEGRATE ROD. The integral column light integrator can be a hollow or non-hollow rod or column integrator. The lens array integrator can be a fly-eye lens. In this example, the integrator 12' is a solid integrating column.
於本具體實施例中，光源10為一經封裝且具有螢光粉的白光發光二極體發光模組，可提供一照明光束I。積分器12’、光閥30、透鏡L及全內反射稜鏡22均設於照明光束I的行進路徑上。一濾光片(filter)20’設於積分器12’與光閥30之間並位於照明光束I的行進路徑上。於本實施例中，濾光片20’可位於透鏡L及全內反射稜鏡22之間，且濾光片20’的有效濾光 範圍小於濾光片20’所在位置的照明光束範圍。於此「有效濾光範圍」是指濾光片中有濾色能力的全部區域，若濾光片的周緣有濾光能力，即使無光線通過，亦屬於有效濾光範圍的一部份。再者，照明光束I於濾光片20’沿垂直光軸方向的延伸平面可形成一投射區域，該投射區域即為濾光片20’所在位置的照明光束範圍。濾光片20’同樣可提供濾除或減弱特定區域強度相對較強的色光的效果，提高投影畫面的顏色均勻性。濾光片20’於積分器12’與光閥30之間的設置位置並不限定，如圖4所示，濾光片20’亦可設置於投影機4的積分器12’(或轉向鏡14)與透鏡L之間。 In the embodiment, the light source 10 is a packaged white light emitting diode module with phosphor powder, and provides an illumination beam I. The integrator 12', the light valve 30, the lens L, and the total internal reflection 稜鏡 22 are all disposed on the traveling path of the illumination beam I. A filter 20' is disposed between the integrator 12' and the light valve 30 and is located on the path of travel of the illumination beam I. In this embodiment, the filter 20' can be located between the lens L and the total internal reflection 稜鏡22, and the filter 20' is effectively filtered. The range of illumination beams is less than the location of the filter 20'. The "effective filter range" refers to the entire area of the filter that has the ability to filter. If the filter has a filtering ability on the periphery, it is part of the effective filter range even if no light passes. Furthermore, the projection plane of the illumination beam I in the direction perpendicular to the optical axis of the filter 20' can form a projection area which is the illumination beam range of the position of the filter 20'. The filter 20' can also provide the effect of filtering out or attenuating the color of the relatively strong intensity of the specific area, and improving the color uniformity of the projected picture. The position of the filter 20 ′ between the integrator 12 ′ and the light valve 30 is not limited. As shown in FIG. 4 , the filter 20 ′ may also be disposed on the integrator 12 ′ of the projector 4 (or a turning mirror). 14) between the lens L.
於上述實施例中，濾光片20’的型態並不限定且不限於片狀，其亦可以是膜片、鍍膜、濾光件等等，如衰減片、彩色濾光片、高通/低通濾光片、帶通濾光片、分色鏡等，即為其例。於本例中，濾光片20’為一可依比例過濾紅光的衰減片。再者，濾光片20’可獨立設置且可藉由一支撐件18支撐以設於積分器12’與全內反射稜鏡22之間的光路上。濾光片20’週邊的支撐件18例如可為透光的平板玻璃或是單一支撐桿而不限定，同時支撐件18可與濾光片20’的至少部份為一體成形(ONE PIECE FORMED)。 In the above embodiment, the shape of the filter 20' is not limited and is not limited to a sheet shape, and may also be a diaphragm, a coating, a filter, etc., such as an attenuator, a color filter, a high pass/low A pass filter, a band pass filter, a dichroic mirror, etc. are examples. In this example, the filter 20' is an attenuator that filters red light proportionally. Further, the filter 20' can be independently provided and supported by a support member 18 to be disposed on the optical path between the integrator 12' and the total internal reflection cymbal 22. The support member 18 around the filter 20' can be, for example, a light-transmissive flat glass or a single support rod without limitation, and the support member 18 can be integrally formed with at least a portion of the filter 20' (ONE PIECE FORMED) .
於一實施例中，濾光膜20(或濾光片20’)於垂直光軸方向上的長度，會小於光路前方的光學元件(例如透鏡L)或者光路後方的光學元件(例如全內反射稜鏡22)的通光孔徑(clear aperture)，或者同時小於其前、後光學元件的通光孔徑。於此「通光孔徑」用語是指透鏡或稜鏡表面形成以助產生光學性能的部分區域的直徑。舉例而言，透鏡或稜鏡於外周區域形成有一凸緣(flange)或其他結構用以供定位組裝等用途，該定位組裝結構是位於透鏡或稜鏡的光學有效直徑外。另外，濾光膜20及濾光片20’的出光表面可 設於光學元件16或是光學元件22的光路上游，或是，設於光線進入各光學元件16、22前的位置。 In an embodiment, the length of the filter film 20 (or the filter 20') in the direction of the vertical optical axis may be smaller than the optical element in front of the optical path (for example, the lens L) or the optical element behind the optical path (for example, total internal reflection) Cle 22) has a clear aperture, or both is smaller than the clear aperture of its front and rear optical components. The term "clear aperture" as used herein refers to the diameter of a portion of the lens or crucible surface that is formed to assist in producing optical properties. For example, a lens or a peripheral region is formed with a flange or other structure for positioning assembly, etc., which is located outside the optically effective diameter of the lens or cymbal. In addition, the light-emitting surface of the filter film 20 and the filter 20' can be It is disposed upstream of the optical path of the optical element 16 or the optical element 22, or at a position before the light enters each of the optical elements 16, 22.
再者，濾光膜20(或濾光片20’)欲濾除的色光種類及濾光區域完全不限定，本領域技術入員可依照實際需求，配置濾光膜20(或濾光片20’)於光路中的選定位置並應用於所需要的環境減少特定色光以達到畫面顏色均勻的效果。舉例而言，如圖5所示，濾光膜20(或濾光片20’)可同時設於光路上的不同光學元件且可分別濾除不同色光，例如投影機5的全內反射稜鏡22可膠合一紅色濾光片20’以減少紅光，且透鏡L表面的局部區域可鍍有綠色濾光膜20以減少綠光。 Furthermore, the color filter type and the filter region to be filtered by the filter film 20 (or the filter 20') are not limited at all, and the filter device 20 (or the filter 20) can be configured according to actual needs. ') The selected position in the light path and applied to the desired environment to reduce the specific color light to achieve a uniform color of the picture. For example, as shown in FIG. 5, the filter film 20 (or the filter 20') can be simultaneously disposed on different optical elements on the optical path and can separately filter different color lights, such as the total internal reflection of the projector 5. 22 may be glued to a red filter 20' to reduce red light, and a partial area of the surface of the lens L may be plated with a green filter film 20 to reduce green light.
圖6A及圖6B分別顯示使用或未使用紅光濾鏡(dichroic mirror-RED)濾光的各色光強度區域分佈圖，其中橫坐標為由畫面中心(0)到最外緣(18)的不同測量位置點，橫坐標數值10至18為畫面最外圍的量測點，縱座標為紅光(R)、綠光(G)、藍光(B)、白光(W)的歸一化強度百分比。圖6A及圖6B之數值取畫面中心點之亮度為最大值為100%而進行歸一化。由圖6A可看出畫面的角落區域的紅光較弱，故相對綠光/藍光的強度產生較大的落差，經濾光後因畫面中央區域的紅光的最大值減少，使得畫面上三色光(RGB)的強度分布如圖6B所示較為一致，達到畫面顏色均勻的效果。 6A and 6B respectively show the light intensity region distribution maps of the respective colors filtered with or without the use of a dichroic mirror-RED, wherein the abscissa is different from the center of the picture (0) to the outermost edge (18). The position point is measured, and the abscissa value 10 to 18 is the measurement point at the outermost periphery of the screen, and the ordinate is the normalized intensity percentage of red light (R), green light (G), blue light (B), and white light (W). The numerical values of Figs. 6A and 6B are normalized by taking the luminance of the center point of the screen to a maximum value of 100%. It can be seen from FIG. 6A that the red light in the corner area of the picture is weak, so that the intensity of the green light/blue light is relatively large, and after filtering, the maximum value of the red light in the central area of the picture is reduced, so that the picture is three. The intensity distribution of the color light (RGB) is more consistent as shown in FIG. 6B, and the effect of uniform color of the screen is achieved.
藉由上述各個實施例的設計，藉由在光學元件表面上或不同光學元件之間，設置可濾除或減弱特定區域強度相對較強的色光的濾光結構，可改善畫面部分區域某顏色亮度過高，而與其他色光相較強度分布不均的問題，符合色均規格的要求。再者，當利用多台投影機拼接出一電視拼牆畫面時，因各個投影畫面具有良好的顏色均勻度，故拼接後的整體畫面顏 色變化較為平順而具有較佳的視效。 By the design of each of the above embodiments, by setting a filter structure on the surface of the optical element or between different optical elements, which can filter or weaken the color light of a relatively strong intensity in a specific region, the brightness of a certain color in the partial region of the screen can be improved. Too high, and the uneven distribution of intensity compared with other shades of light, in line with the requirements of color specifications. Furthermore, when a plurality of projectors are used to splicing a screen of a TV wall, since the respective projection screens have good color uniformity, the overall screen image after splicing The color change is smoother and has better visual effect.
本發明在運用時，各種細節可以自由變化。例如，前述的一例中有提及利用一尺度較小的濾光片，來過濾照明光線的中間部份紅色的光線，以達到均勻畫面中央、邊沿色彩強度的目的。但除了紅色濾光片外，亦可以改以過濾其他顏色光線的濾光片或濾光膜來達到相對的效果。另外，濾光片或濾光膜亦不以設置於光學表面的中央為限，需要時，其可按需要調整其設置的位置。 Various details can be freely changed when the invention is applied. For example, in the foregoing example, it is mentioned that a small-sized filter is used to filter the red light in the middle portion of the illumination light to achieve uniform color intensity at the center and edge of the picture. However, in addition to the red filter, it is also possible to change the filter or filter film of other color light to achieve the relative effect. In addition, the filter or the filter film is not limited to the center of the optical surface, and if necessary, it can be adjusted as needed.
雖然本發明已以較佳實施例揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍內，當可作些許之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。 While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.
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| CN104102079B (en) * | 2013-04-02 | 2016-08-03 | 扬明光学股份有限公司 | Light source module and projection arrangement |
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