TW200525173A - Bevel gradient dichroic film and iqc method thereof and liquid crystal on silicon thereof - Google Patents
Bevel gradient dichroic film and iqc method thereof and liquid crystal on silicon thereof Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 66
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title abstract 2
- 229910052710 silicon Inorganic materials 0.000 title abstract 2
- 239000010703 silicon Substances 0.000 title abstract 2
- 239000003086 colorant Substances 0.000 claims abstract description 26
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Abstract
Description
200525173 五、發明說明（1) 發明所屬之技術領域 本發明是有關於一種漸變式分光薄膜與其反射式液晶 投影顯示裝置。且特別是，有關於一種可以適用於離軸式 投影光機系統，並改善其均勻度、亮度與對比清晰度之斜 向漸變式分光薄膜與檢驗方法與其反射式液晶投影顯示裝 置。 先前技術 近年來，因為液晶顯示器（Liquid Crystal Display， L C D)具有外型薄、重量輕、低操作電壓、省電、以及無輻 射線等優點，已逐漸取代於傳統的陰極射線管（Cathode Ray Tube， CRT)，而成為顯示裝置的主流。然而，由於液 晶顯示器（L C D)技術上的限制，多半只能侷限在顯示幕為 3 0吋以下的產品。而對於3 0吋至6 0吋左右的顯示器，原本 以電漿顯示器（Plasma Display Panel, PDP)之發展最被 看好，然而，因為其成本過高，故無法成為一般消費者所 能接受的產品。 因此，對於大尺寸顯示裝置的發展方向，目前是朝向 發展採用投影技術的顯示裝置，例如說，反射式投影顯示 裝置（reflective projection display device)與背投影 顯示裝置（rear projection display device)等。其中反 射式投影顯示裝置包括液晶投影機（Li quid Crystal Projector, LCP)、數位光源調配投影機（Digital Light Projector， DLP)與反射式液晶（Liquid Crystal On200525173 V. Description of the invention (1) Technical field to which the invention belongs The present invention relates to a graded light-splitting film and a reflective liquid crystal projection display device thereof. In particular, the invention relates to an oblique gradient light-splitting film and inspection method and a reflective liquid crystal projection display device which can be applied to an off-axis projector light system and improve its uniformity, brightness, and contrast sharpness. In recent years, liquid crystal displays (Liquid Crystal Display, LCD) have gradually replaced traditional cathode ray tubes (Cathode Ray Tubes) due to their advantages of thin profile, light weight, low operating voltage, power saving, and no radiation. , CRT), and become the mainstream of display devices. However, due to the technical limitations of liquid crystal displays (LCD), most of them can only be limited to products with a display screen of less than 30 inches. For displays ranging from 30 inches to 60 inches, the development of Plasma Display Panel (PDP) was originally the most promising. However, because its cost is too high, it cannot become a product acceptable to ordinary consumers. . Therefore, the development direction of large-sized display devices is currently toward the development of display devices using projection technology, such as reflective projection display devices (rearive projection display devices) and rear projection display devices (rear projection display devices). The reflective projection display device includes a liquid crystal projector (Liquid Crystal Projector, LCP), a digital light source deployment projector (Digital Light Projector, DLP), and a reflective liquid crystal (Liquid Crystal On).
12281twf.ptd 第8頁 200525173 五、發明說明~(2) ' ' "12281twf.ptd Page 8 200525173 V. Description of the Invention ~ (2) '' "
Si 1 icon， LC0S)投影顯示裝置等。而背投影顯示裝置中亦 會使用到反射式液晶（LC〇S)投影技術。目前市場上的產品 雖然以液晶投影機（LCP)與數位光源調配投影機（DLP)為 主，但是因，反射式液晶（LC〇s)投影技術具有低成本、高 開口率 >(可南達9 0 % )、高解析度（像素間距可至丨2 _或 更小）等優點，已有許多廠商開始發展此技術。 、因此’反射式液晶（L C 0 S )投影技術，可以說是是反射 式投影顯示裝置與背投影顯示裝置的關鍵技術，其最大優 點在於可大幅降低面板生產成本，並且具高解析度。 第1圖為一示意圖，繪示習知的反射式液晶（L c 〇 s )投 影裝置。請參照第1圖，其中反射式液晶（L c 〇 s )投影裝置 與其工作原理’基本上是由光源1 〇 2發出白光1 〇 4，經由濾 光片106與分色透鏡1〇8分出紅光112、綠光122與藍光 142。其中’經由分色鏡（dichroic mirror)110，紅光 1 1 2，經由反射鏡1 1 4反射而到達偏極化分光鏡 (Polarization Beam Splitter，PBS)116 〇 第2 A圖與第2 B圖為一示意圖，繪示習知偏極化分光鏡 (PBS)的作用原理。此處以入射光為紅光舉例說明之，當 紅光112，通過反射式液晶面板（LCOS panel) 118前的偏極 化分光鏡（PBS) 1 1 6後，偏極化分光鏡（PBS) 1 1 6只會將其中 一個偏極方向的極化光反射入LC0S面板，例如說偏極化分 光鏡（PBS)116，是反射紅光112之S偏極光 (S-polarization light)進入反射式液晶面板118。請參 照第2 A圖，當反射式液晶面板1 1 8上所欲顯示之影像為暗Si 1 icon, LCOS) projection display device and the like. In the rear projection display device, a reflective liquid crystal (LCOS) projection technology is also used. Although the current products on the market are mainly liquid crystal projectors (LCP) and digital light source deployment projectors (DLP), due to the low-cost, high aperture ratio of reflective liquid crystal (LC0s) projection technology > (可 南Up to 90%), high resolution (pixel pitch can reach 丨 2 _ or less) and other advantages, many manufacturers have begun to develop this technology. Therefore, the 'reflective liquid crystal (L C 0 S) projection technology can be said to be the key technology of the reflective projection display device and the rear projection display device. Its biggest advantage is that it can greatly reduce the production cost of the panel and has high resolution. FIG. 1 is a schematic diagram showing a conventional reflection type liquid crystal (L c 0 s) projection device. Please refer to FIG. 1, in which a reflective liquid crystal (L c 0 s) projection device and its working principle are basically white light 1 〇 4 emitted by a light source 1 〇 2 and separated by a filter 106 and a dichroic lens 108. Red light 112, green light 122, and blue light 142. Among them, via a dichroic mirror 110, red light 1 1 2 and reflection through a mirror 1 1 4 reach a Polarization Beam Splitter (PBS) 116 〇 2A and 2B As a schematic diagram, the working principle of a conventional polarized beam splitter (PBS) is shown. Here, the incident light is taken as the red light as an example. When the red light 112 passes through the polarizing beam splitter (PBS) 1 1 6 in front of the reflective liquid crystal panel (LCOS panel) 118, the polarizing beam splitter (PBS) 1 1 6 will only reflect the polarized light in one of the polar directions into the LC0S panel, such as the polarized beam splitter (PBS) 116, which reflects the red light 112 S-polarization light into the reflective LCD panel 118. Please refer to Figure 2A. When the image to be displayed on the reflective LCD panel 1 1 8 is dark
12281twf.ptd 第9頁 20052517312281twf.ptd Page 9 200525173
五、發明說明（3) 態（dark)時，入射於反射式液晶面板丨丨8的S偏極光將被 射回來，而無法進入合光稜鏡（X - Cu b e ) 1 5 2。接著，請表& 照第2 B圖’當反射式液晶面板1 1 8上所欲顯示之影像為二 態時，入射於L C 0 S面板1 1 8的S偏極光，將被L C 0 S面板^織 成P偏極光（P-polarization light)120 ，因此可以穿透文 極化分光鏡1 1 6而到達合光稜鏡1 5 2。 偏 因此，紅光112、綠光122與藍光142，各自經由其偏 極化分光鏡（P B S ) 1 1 6、1 3 0與1 4 4，被反射到反射式液晶面 板1 1 8、1 3 2與1 4 6上，經由反射式液晶面板將具有影像部 分的紅光、綠光與藍光部分偏極化後，再經由合光稜鏡 1 5 2將部分偏極化後之紅光1 2 0、綠光1 3 4與藍光1 4 8相結 合，得到影像訊號，最後透過變焦透鏡1 5 4，將該影傻却 號投射到顯示幕上。 ° 由上述可之，現有習知之反射式液晶投影設計中，分 光與合光之元件為重要之元件’因為若分光或合光之三原 色光之比例不均勻，會造成組合後影像之不均勻而有顏色 之偏差’直接影響到影像之均勻度（Unif〇rmify)與亮度 (brightness)。另外，若合光後之三原色光之聚焦不正 確，會造成組合後影像模糊，直接影響到影像之解析度 (resolution) 〇 目前，習知之反射式液晶投影設計中，其分光元件， 夕半使用i光ί夂鏡（X-cube)或分色鏡（dichroic mirror) 或分色濾片（d i c h r o i c f i 1 t e r )。例如說，如第1圖所示之 合光稜鏡（X-cube) 110，當光線行進之方向相反時即可作V. Description of the invention (3) In the dark state, the S-polarized light incident on the reflective liquid crystal panel 丨 丨 8 will be reflected back, and cannot enter the combined light (X-Cu b e) 1 5 2. Next, please refer to Figure 2B. When the image to be displayed on the reflective liquid crystal panel 1 1 8 is two-state, the S polarized light that enters the LC 0 S panel 1 1 8 will be LC 0 S The panel ^ is woven into a P-polarization light 120, so it can pass through the polarization polarization beam splitter 1 1 6 and reach the combined light 1 5 2. Therefore, the red light 112, the green light 122, and the blue light 142 are reflected to the reflective liquid crystal panel 1 1 8, 1 3 through their polarization polarization beam splitters (PBS) 1 1 6, 1, 3 0, and 1 4 4 respectively. On 2 and 1 4 6, the red, green, and blue light with the image part is polarized through the reflective liquid crystal panel, and then the partially red light is partially polarized through the combined light 1 5 2 0, green light 1 3 4 and blue light 1 4 8 are combined to obtain an image signal, and finally the shadow lens is projected on the display screen through the zoom lens 1 5 4. ° From the above, in the conventional conventional reflective liquid crystal projection design, the element of splitting and combining light is an important element. 'Because the proportion of the three primary colors of the splitting or combining light is not uniform, it will cause unevenness of the combined image. The color deviation has a direct impact on the uniformity (uniformity) and brightness (brightness) of the image. In addition, if the three primary color lights are not focused properly after combining light, the combined image will be blurred, which directly affects the resolution of the image. Currently, in the conventional reflective liquid crystal projection design, the beam splitting element is used in the middle of the night. i 光 ί 夂 Mirror (X-cube) or dichroic mirror or dichroicfi 1 ter. For example, the X-cube 110 shown in Figure 1 can be used when the light travels in opposite directions.
200525173 五、發明說明（4) 為一分光稜鏡。第1圖所示之分色鏡（dichroic mirror)110中即使用了分色鏡或分色濾片。其次，目前習 知之反射式液晶投影設計中，其光線行進之光徑（1 i gh t path)，與分光元件反射面之法線（normal)方向多為平 行，此種設計一般稱為同軸式（〇 η - a X i s )設計。例如說， 在第1圖中，紅光112之行進方向與偏極化分光鏡116之反 射面162及合光稜鏡152之反射面164垂直。 第3 A圖為一上視圖，繪示習知分光鏡之同軸式光學設 計。第3B圖為一剖面圖，繪示第3A圖中，從A方向所得之 示意圖。第3C圖為一剖面圖，繪示第3A圖中，B-B剖面上 所得之光斑（light spot)示意圖。從第3B圖中，可以知 道，光線302是垂直入射於分光鏡304之反射面306。從第 3 C圖中，可以知道，光線3 0 2在反射面3 0 6上所得到之光斑 (light spot)312之形狀為一橢圓形。一般而言，此種同 軸式光學設計，可以得到顏色均勻度不錯之光斑3 1 2。 當需要得到更佳的顏色均勻度時，可以利用光學鍍膜 技術，在分色鏡或分色濾片上’鍍上不同屬性之介電質或 金屬薄膜，以藉由光線的干涉作用來改變光波傳遞的特 性。例如說，在此可以在分色鏡或分色濾、片上鐘上特殊光 學薄膜鍵膜，形成水平漸變式分色鏡（horizontal gradient coating dichroic mirror )或水平漸變式分色 慮片（horizontal gradient coating dichroic filter )，以從入射光中，濾出所需要的較均勻且高穿透率之三 原色光，以利最後合成顏色均勻度較佳之影像，來提高同200525173 V. Description of the invention (4) It is a light beam. A dichroic mirror 110 or a dichroic mirror is used in the dichroic mirror 110 shown in FIG. 1. Secondly, in the conventional reflective liquid crystal projection design, the light path (1 i gh t path) of the light travels is mostly parallel to the normal direction of the reflecting surface of the beam splitter. This design is generally called coaxial (〇η-a X is) design. For example, in FIG. 1, the traveling direction of the red light 112 is perpendicular to the reflection surface 162 of the polarization beam splitter 116 and the reflection surface 164 of the combined light beam 152. Figure 3A is a top view showing the coaxial optical design of a conventional beamsplitter. Fig. 3B is a sectional view showing a schematic diagram obtained from the direction A in Fig. 3A. Fig. 3C is a cross-sectional view showing a light spot obtained on the B-B cross section in Fig. 3A. From Fig. 3B, it can be seen that the light 302 is incident on the reflecting surface 306 of the beam splitter 304 perpendicularly. From Figure 3C, it can be known that the shape of the light spot 312 obtained by the light 3 2 on the reflecting surface 3 0 6 is an ellipse. Generally speaking, this kind of coaxial optical design can get a light spot with good color uniformity 3 1 2. When better color uniformity is needed, the optical coating technology can be used to apply a dielectric or metal film with different properties on the dichroic mirror or dichroic filter to change the light wave transmission by the interference of light Characteristics. For example, a special optical film key film on a dichroic mirror or dichroic filter, or a clock on the sheet can be used to form a horizontal gradient coating dichroic mirror or a horizontal gradient coating. dichroic filter) to filter out the more uniform and high-transmittance three primary color lights from the incident light, so as to synthesize an image with better color uniformity at the end to improve the same
12281twf.ptd 第11頁 200525173 五、發明說明（5) 軸式光學設計中顏色均勾度。 第4圖為一示意圖，繪示一離軸式（off-axis)反射式 液晶（LC0S)投影裝置。請參照第4圖，其中離軸式反射式 液晶（LC0S)投影裝置，其工作原理基本上是由光源4 0 2發 出白光經由分色鏡（dichroic mirror)404 ，分出紅光 4 0 6、綠光4 0 8與藍光41 0。此三原色光經由極化片 (ρ ο 1 a r i z e r ) 4 1 2偏極化後，入射到反射式液晶面板4 1 4 上，經由反射式液晶面板4 1 4將具有影像部分的紅光、綠 光與藍光部分偏極化後，再經由偏檢片（a n a 1 y z e r ) 4 1 6與 合光稜鏡（d i c h r o i c m i r r o r ) 4 1 8將部分偏極化後之紅光、 綠光與藍光相結合，而得到影像訊號，最後再將該影像訊 號投射到顯示幕上。 在離軸式反射式液晶投影裝置中，有一個問題是，分 光後三原色光之各顏色分佈不均句。一般而言，即使在離 軸式反射式液晶投影裝置中，使用水平漸變式分色鏡或水 平漸變式分色濾片，分光後三原色光之各顏色分佈仍然不 夠均勻。因此，如何改善離軸式反射式液晶投影裝置中， 分光後三原色光之各顏色分佈之均勻度與對比清晰度，是 一個相當重要之課題。 發明内容 本發明之一目的是提出一種斜向漸變式分光薄膜，以 有效地提升經由該斜向漸變式分光薄膜所得之分光光束之 均勻度、亮度與對比清晰度。12281twf.ptd Page 11 200525173 V. Description of the invention (5) Uniform degree of color in axial optical design. FIG. 4 is a schematic diagram showing an off-axis reflective liquid crystal (LC0S) projection device. Please refer to FIG. 4, wherein an off-axis reflective liquid crystal (LC0S) projection device basically works by emitting white light from a light source 40 2 through a dichroic mirror 404 and dividing red light 4 0 6. Green light 4 0 8 and blue light 41 0. The three primary colors of light are polarized by a polarizer (ρ ο 1 arizer) 4 1 2 and incident on the reflective liquid crystal panel 4 1 4. The red light and green light having the image portion are transmitted through the reflective liquid crystal panel 4 1 4 Partially polarized with blue light, and then combined with partially polarized red, green, and blue light via an ana 1 yzer 4 1 6 and dichroicmirror 4 1 8 and Get the image signal, and finally project the image signal onto the display screen. In the off-axis reflection type liquid crystal projection device, there is a problem in that each color distribution of the three primary colors of light is not uniformly distributed. In general, even in an off-axis reflective liquid crystal projection device, a horizontal gradation type dichroic mirror or a horizontal gradation type dichroic filter is used, and the color distribution of the three primary color lights after the light splitting is still not uniform. Therefore, how to improve the uniformity and contrast sharpness of each color distribution of the three primary colors of light in the off-axis reflective liquid crystal projection device is an important issue. SUMMARY OF THE INVENTION It is an object of the present invention to provide an obliquely graded beam splitting film to effectively improve the uniformity, brightness, and contrast definition of a beam of light obtained through the obliquely graded beam splitting film.
12281twf.ptd 第12頁 200525173 五 另 之 6)明 W發 5本 明 發 裝 示 顯 影 投 晶 液 式 射 反 種 一 出 提 是 的 目 經度 升亮 提、 地度 效勻 有均 以之 ，束 膜光 薄光 光分 分之 式得 變所 漸膜 向薄 斜光 之分 明式。 發變度 本漸晰 有向清 具斜比 ，該對 置由與 向 斜 種 1 出 提 是測 的檢 目地 一效 再有 之以 明， 發法 本方 測 檢 漸 向 斜 該 由 經 之得 膜所 薄膜 光薄 分光 式分 變式 漸變 變 漸 向 斜 種 1 。出 度提 晰明 清發 比本 對， 與的 度目 亮一 、之 度明 勻發 均本 之成 束達 光了 光為 分 之 置具 裝質 示性 顯層 影膜 投一 晶之 液膜 式薄 射光 反分 式該 軸中 離其 於膜 用薄 適光 可分 - 膜括 薄包 光其 分’ 式上 射膜 入薄 一光 與分 ，該 向在 方光 變射 漸入 亥亥 =口 古口 之得 膜獲 薄以 光可 分此 該藉 中， 其關 。相 向角 方射 變入 漸一 一之 有光 薄 光 分 式 變 漸 〇 向 佈斜 分之 勻述 均上 為， 性中 特例 線施 光實 一 一 之之 上明 斑發 光本 一在 之 上 薄 光 分 式 變 漸 向 斜 。之 屬述 金上 或， 質中 電例 介施 括實包一 以之 可明 料發 材本 其在 膜 或 度 厚 層 膜 括 包 以 可 質 性 層 膜 之 質 性 變 漸 有 具。 中性 其特 ，電 膜介 量度 薄能光 光的分 分勻之 式均線 變有光 漸具色 向括顏 斜包同 之以不 述可對 上，是 ，性或 中特， 例之佈 施斑分 實光率 一之射 之到反 明得的 發所勻 本中均 在其、 ，佈 膜分 式 射 反 種 二 *01 提(C 明鏡 發色 本分 - 的、 目源 一光 另一 之括 明包 發其 本， 。成置 的達裝 勻了影 均為投 為 晶 是 液 12281twf.ptd 第13頁 200525173 五、發明說明（7) separation mirror)、 一極4匕片（polarizer)、 一反射式 液晶面板、一偏檢片（analyzer)與一合光鏡（color recombination mirror)。其中，該光源是用以發出白 光，經由分色鏡（color separation mirror)，分出三原 色光。此三原色光經由極化片（P 〇 1 a r i z e r )偏極化後，入 射到反射式液晶面板上，經由反射式液晶面板將具有影像 部分的三原色光部分偏極化後，再經由偏檢片（analyzer) 與合光鏡（color recombination mirror)將部分偏極化後 之三原色光相結合，而得到影像訊號，最後再將該影像訊 號投射到顯示幕上。其中至少分色鏡或合光鏡其中之一夂 上，形成有本發明之斜向漸變式分光薄膜，該斜向漸變式 分光薄膜之詳細敘述，請見於上述敘述中，在此不再重 複。 為了達成本發明之再一目的，本發明提出一種斜向漸 變式分光薄膜之檢測方法。該方法包括提供一入射光’其 對於一斜向漸變式分光薄膜，具有複數個不同之入射角； 以及檢測該入射光在不同的該些入射角上，所得到的一分 光光束之一光線特性是否為均勻分佈。 在本發明之一實施例中，如上所述之斜向漸變式分光 薄膜之檢測方法，其中該分光光束之該光線特性，包括能 量分佈、反射率，或是對不同顏色光線之分光度。 綜上所述，藉由本發明所提供之斜向漸變式分光薄膜 與其檢測方法，以及其反射式液晶投影顯示裝置，因為分 光鏡上所鍍上膜層厚度或性質之漸變方向，與入射光之入12281twf.ptd Page 12 200525173 Five other 6) Ming W hair 5 copies of the Ming hair display showing the development of the liquid crystal type shooting, one kind of extraction, the longitude of the eye is bright, the ground effect is uniform, all The film light thin light division formula can be changed to the thin film oblique light clear formula. The degree of change of the direction gradually becomes clear, and the direction of the oblique ratio is clear. The opposite reason and the direction of the type 1 can be seen again and again. The thin film of the thin film obtained by the film is a thin spectroscopic type, a gradual change type, and a gradual change to the oblique type 1. The degree of clarity is better than that of clear and clear hair, and the degree of brightness is bright. The degree of bright and even hair is equal to the bundle of light. The light is divided into a liquid film type with a display film. Thin light reflection type This axis can be separated from the film with a thin light-the film includes a thin package of light and the light is divided into a thin light and a light. The direction of the light in the square is gradually changed into the Haihai = Kougukou The thin film can be divided into light and light, which is the key. Opposite angle angle shots change into progressive light, thin light fractions gradually change to 0. The oblique division of the cloth is all described as, in the special case, the light is applied on top of the light, and the light emission is on top of thin light. Fractions become oblique. It is said that the quality of the electrical examples in the medium includes the fact that the material can be clearly identified. The quality of the material in the film or the thick layer of the film can be gradually improved. Neutral is special, the dielectric film measures thin energy, light, light, light, light, light, and light. The mean line changes to light. The color gradually changes to the color. The oblique package is not included in the description. Yes, it is sexual or medium. The real light ratio of the shot to the anti-Mingde hairpins are all in its, and the film is divided into two kinds of reflection type * 01 mention (C Mirror mirror hair color--, the eye source one light another Included is the package, which is issued by Cheng Ming. The uniformly mounted film is cast as a crystal liquid. 12281twf.ptd Page 13 200525173 V. Description of the invention (7) Separation mirror), 1 pole 4 polarizer, A reflective liquid crystal panel, an analyzer, and a color recombination mirror. The light source is used to emit white light, and the three primary color lights are separated through a color separation mirror. The three primary colors of light are polarized by a polarizer (Po arizer), and then incident on a reflective liquid crystal panel. The three primary colors of light having an image portion are polarized by the reflective liquid crystal panel, and then passed through a polarizer ( An analyzer) and a color recombination mirror combine partially polarized three primary colors of light to obtain an image signal, and finally project the image signal onto a display screen. Among them, at least one of the dichroic mirror or the combiner mirror is formed with the obliquely progressive dichroic film of the present invention. The detailed description of the obliquely progressive dichroic film is described in the above description, and will not be repeated here. In order to achieve another objective of the present invention, the present invention provides a method for detecting an obliquely progressive spectroscopic film. The method includes providing an incident light, which has a plurality of different incident angles for an obliquely progressive beam splitting film; and detecting a light characteristic of one of the obtained divided light beams at different incident angles of the incident light. Whether it is evenly distributed. In one embodiment of the present invention, as described above, in the method for detecting an obliquely-graded spectroscopic film, the light characteristics of the spectroscopic beam include energy distribution, reflectance, or spectrophotometry for light of different colors. In summary, with the oblique gradient light-splitting film provided by the present invention and its detection method, as well as its reflective liquid crystal projection display device, the direction of the gradation of the thickness or property of the coating layer on the beam splitter and the direction of the incident light Into
12281twf.ptd 第14頁 200525173 五、發明說明（8) 射角有關。因此藉由調整分光鏡上所鍍上膜層厚度或膜層 性質等之方向，以及該變化方向上，膜層厚度或膜層性質 之分佈情形，可以得到例如說，能量、顏色、反射率或穿 透率、以及對不同顏色之光線之分光度等分佈相當均勻之 分光光束。因此，可以相當程度地提高反射式液晶投影顯 示裝置之分光光束均勻度、不同顏色分光光束之間之均勻 度、分光光束之可用能量，亦即提高輸出影像之亮度、均 勻度與對比清晰度。 為讓本發明之上述和其他目的、特徵、和優點能更明 顯易懂，下文特舉一較佳實施例，並配合所附圖式，作詳 細說明如下： 實施方式： 第5 A圖為一上視圖，繪示分光鏡之離軸式光學設計。 第5B圖為一剖面圖，繪示第5A圖中，從C方向所得之示意 圖。第5C圖為一剖面圖，繪示第5A圖中，D-D剖面上所得 之光斑（light spot)示意圖。從第5B圖中，可以知道，光 線5 0 2並不是垂直入射於分光鏡5 0 4之反射面5 0 6，而是與 反射面5 0 6之法線間具有一角度。從第5 C圖中，可以知 道，光線5 0 2在反射面5 0 6上所得到之光斑（1 ight spot)512之形狀為一斜向的橢圓形，而且在此離軸式光學 設計中，光斑5 1 2之顏色均勻度並不好。 當需要得到更佳的顏色均勻度時，其中的一個改良方 法是，可以利用光學鍍膜技術，在分光鏡5 0 4上，鍍上不12281twf.ptd Page 14 200525173 V. Description of the invention (8) The angle of incidence is related. Therefore, by adjusting the direction of the thickness of the coating layer or the properties of the coating layer on the beam splitter, and the distribution of the thickness of the coating layer or the properties of the coating layer in the direction of change, for example, energy, color, reflectance, or The transmittance, and the spectrophotometry of light of different colors are quite evenly distributed. Therefore, the uniformity of the spectral beams of the reflective liquid crystal projection display device, the uniformity of the beams of different colors, and the available energy of the spectral beams can be greatly improved, that is, the brightness, uniformity, and contrast definition of the output image can be improved. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings for detailed description as follows: Embodiment: FIG. 5A is a The top view shows the off-axis optical design of the beamsplitter. Fig. 5B is a sectional view showing a schematic diagram obtained from the C direction in Fig. 5A. Fig. 5C is a cross-sectional view showing the light spot obtained on the D-D section in Fig. 5A. From Fig. 5B, it can be known that the light 502 is not incident on the reflecting surface 5 0 6 of the beam splitter 5 0 4 perpendicularly, but has an angle with the normal of the reflecting surface 5 0 6. From Figure 5C, it can be known that the shape of the 1 ight spot 512 obtained by the light 5 2 on the reflecting surface 5 0 6 is an oblique ellipse, and in this off-axis optical design The color uniformity of the light spot 5 1 2 is not good. When better color uniformity is needed, one of the improved methods is to use optical coating technology.
12281twf.ptd 第15頁 200525173 五、發明說明（9) 同屬性之介電質或金屬薄膜，以藉由光線的干涉作用來改 變光波傳遞的特性。但是，在此離軸式光學設計中，並不 是形成水平漸變式分光鏡，而是形成水平漸變式分光鏡， 而是形成一斜向漸變式分光鏡（bevel gradient coating dichroic mirror) o 第6圖為一截面圖，繪示一水平漸變式分光鏡，用於 離軸式光學設計之一示意圖。請參照第6圖，其中分光鏡 之反射面6 0 2上鑛膜的漸變方式是，例如說，在箭號E之方 向上，膜層厚度逐漸改變。基本上，對於水平漸變式分光 鏡，箭號E在水平方向上。而光線之入射方向，例如說， 在第6圖中，具有相同入射角的光線以直線6 0 4來表示。因 此，可以知道，光線之入射方向，與膜層厚度改變方向， 即箭號E並不相關。因此在離軸式光學設計中，光線為斜 向入射，因此得到之光斑上顏色分佈不均勻。 第7圖為一截面圖，繪示一斜向漸變式分光鏡，用於 離軸式光學設計之一示意圖。請參照第7圖，其中分光鏡 之反射面702上所鍍膜層厚度的漸變方向，或是膜層性質 的漸變方向，例如說，在箭號F之方向上，以造成分光鏡 之反射面上所鍍上膜層厚度或性質逐漸改變。對於斜向漸 變式分光鏡，箭號F並不一定在水平方向上，而是與光線 之入射方向有關。例如說，具有相同入射角的光線以直線 704來表示，因此箭號F之方向與直線704之方向有關。藉 由調整分光鏡之反射面上所鍍上膜層厚度或性質之方向， 例如說箭號F之方向，與箭號F之方向上，膜層厚度或性質12281twf.ptd Page 15 200525173 V. Description of the invention (9) Dielectric or metal thin film of the same property, in order to change the characteristics of light wave transmission by the interference of light. However, in this off-axis optical design, instead of forming a horizontal gradation beam splitter, it forms a horizontal gradation beam splitter, but instead forms a bevel gradient coating dichroic mirror. O Figure 6 It is a cross-sectional view showing a schematic diagram of a horizontal progressive beam splitter used in off-axis optical design. Please refer to FIG. 6, where the gradation of the mineral film on the reflecting surface 6 0 2 of the spectroscope is, for example, in the direction of the arrow E, the thickness of the film layer gradually changes. Basically, for a horizontal progressive beamsplitter, the arrow E is in the horizontal direction. The incident direction of light rays, for example, in FIG. 6, light rays having the same incident angle are represented by a straight line 60 4. Therefore, it can be known that the incident direction of light is not related to the direction of film thickness change, that is, arrow E. Therefore, in the off-axis optical design, the light is incident obliquely, so the color distribution on the obtained spot is uneven. Fig. 7 is a cross-sectional view showing an obliquely progressive beam splitter for use in an off-axis optical design. Please refer to FIG. 7, in which the direction of the thickness of the coating layer on the reflecting surface 702 of the spectroscope is gradually changed, or the direction of the property of the coating layer is gradually changed, for example, in the direction of the arrow F to create the reflecting surface of the spectroscope The thickness or properties of the coated layer gradually change. For obliquely progressive beamsplitters, the arrow F is not necessarily in the horizontal direction, but is related to the direction of light incidence. For example, light rays with the same incident angle are represented by a straight line 704, so the direction of the arrow F is related to the direction of the straight line 704. By adjusting the thickness or property of the coating layer on the reflecting surface of the beam splitter, for example, the direction of the arrow F and the direction of the arrow F, the thickness or property of the film
12281twf.ptd 第16頁 200525173 五、發明說明（ίο) 之分佈情形，例如說，膜層厚度分佈之之變化，可以得到 顏色分佈相當均勻之光斑。 在本發明之一實施例中，上述之直線7 0 4，可以包括 相同入射角所形成一曲線，並不一定為一直線。 在本發明之一實施例中，上述之斜向漸變式分光薄 膜，其材料可以包括介電質或金屬。 在本發明之一實施例中，上述之斜向漸變式分光薄 膜，其中具有漸變性質之膜層性質，可以包括膜層厚度或 介電特性。 在本發明之一實施例中，上述之斜向漸變式分光薄 膜，其中所得到之光斑之特性，可以包括具有均勻的能量 分佈、均勾的反射率分佈，或是對不同顏色光線之分光度 是為均勻的。 在本發明中，提供一種反射式液晶（LC0S)投影裝置。 在此，本發明之反射式液晶投影裝置可以以第4圖所示之 離軸式反射式液晶投影裝置為例，但是第4圖所示之離軸 式反射式液晶投影裝置，只是做為一範例，並不用以限制 本發明之範圍。 請參照第4圖，其中離軸式反射式液晶（LC0S)投影裝 置，包括一光源402 ，用以發出白光，經由分色鏡（color separation mirror)404 ，分出三原色光406 、 408 與410 。 此三原色光經由極化片（ρ ο 1 a r i z e r ) 4 1 2偏極化後，入射到 反射式液晶面板4 1 4上，經由反射式液晶面板4 1 4將具有影 像部分的三原色光部分偏極化後，再經由偏檢片12281twf.ptd Page 16 200525173 V. Description of the distribution of the invention, for example, changes in the thickness distribution of the film layer, can obtain a spot with a fairly uniform color distribution. In an embodiment of the present invention, the straight line 704 may include a curve formed by the same incident angle, and is not necessarily a straight line. In one embodiment of the present invention, a material of the above-mentioned obliquely gradient spectroscopic film may include a dielectric or a metal. In one embodiment of the present invention, the obliquely graded spectroscopic thin film described above, which has a graded film property, may include a film thickness or a dielectric property. In an embodiment of the present invention, the characteristics of the obtained light spot in the above-mentioned oblique gradient light-splitting film may include a uniform energy distribution, a uniform reflectance distribution, or a spectrophotometry for light of different colors. Is uniform. In the present invention, a reflective liquid crystal (LCOS) projection device is provided. Here, the reflection type liquid crystal projection device of the present invention can take the off-axis reflection type liquid crystal projection device shown in FIG. 4 as an example, but the off-axis reflection type liquid crystal projection device shown in FIG. 4 is only used as an example. Examples are not intended to limit the scope of the invention. Please refer to FIG. 4, where an off-axis reflective liquid crystal (LC0S) projection device includes a light source 402 for emitting white light, and the three primary color lights 406, 408, and 410 are separated through a color separation mirror 404. The three primary colors of light are polarized through a polarizer (ρ ο 1 arizer) 4 1 2 and then incident on the reflective liquid crystal panel 4 1 4. The three primary colors of the image portion are polarized through the reflective liquid crystal panel 4 1 4 After partialization
12281twf.ptd 第17頁 200525173 五、發明說明（11) (analyzer)416 與合光鏡（color recombination m i r r o r ) 4 1 8將部分偏極化後之三原色光相結合，而得到影 像訊號，最後再將該影像訊號投射到顯示幕上。其中至少 分色鏡4 04或合光鏡4 18其中之一之上，形成有本發明之斜 向漸變式分光薄膜，該斜向漸變式分光薄膜之詳細敘述， 請見於上述敘述與第7圖中，在此不再重複。 在本發明中，提供一種斜向漸變式分光薄膜之檢測方 法 IQC(incoming quality control)。該方法包括提供一 入射光，其對於一斜向漸變式分光薄膜，具有複數個不同 之入射角；以及檢測該入射光在不同的該些入射角上，所 得到的一分光光束之一光線特性是否為均勻分佈。 在本發明之一實施例中，如上所述之斜向漸變式分光 薄膜之檢測方法，其中該分光光束之該光線特性，包括能 量分佈、反射率，或是對不同顏色光線之分光度。 綜上所述，藉由本發明所提供之斜向漸變式分光薄膜 與其檢測方法，以及其反射式液晶投影顯示裝置，因為分 光鏡上所鍍上膜層厚度或性質之漸變方向，與入射光之入 射角有關。因此藉由調整分光鏡上所鍍上膜層厚度或膜層 性質等之方向，以及該變化方向上，膜層厚度或膜層性質 之分佈情形，可以得到例如說，能量、顏色、反射率或穿 透率、以及對不同顏色之光線之分光度等分佈相當均勻之 分光光束。因此，可以相當程度地提高反射式液晶投影顯 示裝置之分光光束均勻度、不同顏色分光光束之間之均勻 度、分光光束之可用能量，亦即提高輸出影像之亮度、均12281twf.ptd Page 17 200525173 V. Description of the invention (11) (analyzer) 416 and color recombination mirror 4 1 8 Combine the partially polarized three primary color lights to obtain the image signal, and finally the image signal The video signal is projected on the display. Among them, at least one of the dichroic mirror 4 04 or the combiner mirror 4 18 is formed with the oblique gradient beam splitting film of the present invention. For a detailed description of the oblique gradient beam splitting film, please refer to the above description and FIG. 7. However, it will not be repeated here. In the present invention, a detection method IQC (incoming quality control) of an obliquely progressive spectroscopic film is provided. The method includes providing an incident light having a plurality of different incident angles for an obliquely gradient beam splitting film; and detecting a light characteristic of one of the obtained divided beams at different incident angles of the incident light. Whether it is evenly distributed. In one embodiment of the present invention, as described above, in the method for detecting an obliquely-graded spectroscopic film, the light characteristics of the spectroscopic beam include energy distribution, reflectance, or spectrophotometry for light of different colors. In summary, with the oblique gradient light-splitting film provided by the present invention and its detection method, as well as its reflective liquid crystal projection display device, the direction of the gradation of the thickness or property of the coating layer on the beam splitter and the direction of the incident light The angle of incidence is related. Therefore, by adjusting the direction of the thickness of the coating layer or the properties of the coating layer on the beam splitter, and the distribution of the thickness of the coating layer or the properties of the coating layer in the direction of change, for example, energy, color, reflectance, or The transmittance, and the spectrophotometry of light of different colors are quite evenly distributed. Therefore, the uniformity of the beam splitting of the reflective liquid crystal projection display device, the uniformity between the beams of different colors, and the available energy of the beam splitting can be improved to a considerable extent, that is, the brightness and uniformity of the output image can be improved.
12281twf.ptd 第18頁 20052517312281twf.ptd Page 18 200525173
12281twf.ptd 第19頁 200525173 圖式簡單說明 第1圖為一示意圖，繪示習知的反射式液晶（L C 0 S )投 影裝置； 第2 A圖與第2 B圖為一示意圖，繪示習知偏極化分光鏡 (PBS)的作用原理； 第3 A圖為一上視圖，繪示習知分光鏡之同軸式光學設 計； 第3B圖為一剖面圖，繪示第3A圖中，從A方向所得之 不意圖， 第3C圖為一剖面圖，繪示第3A圖中，B-B剖面上所得 之光斑（light spot)示意圖； 第4圖為一示意圖，繪示一離軸式（off-axis)反射式 液晶（LC0S)投影裝置， 第5 A圖為一上視圖，繪示分光鏡之離軸式光學設計； 第5B圖為一剖面圖，繪示第5A圖中，從C方向所得之 示意圖； 第5 C圖為一剖面圖，繪示第5 A圖中，D - D剖面上所得 之光斑（light spot)示意圖； 第6圖為一截面圖，繪示一水平漸變式分光鏡，用於 離軸式光學設計之一示意圖；以及12281twf.ptd Page 19 200525173 Brief Description of the Drawings Figure 1 is a schematic diagram showing the conventional reflective liquid crystal (LC 0 S) projection device; Figures 2 A and 2 B are schematic diagrams showing the exercises Know the working principle of polarizing beam splitter (PBS); Figure 3 A is a top view showing the coaxial optical design of a conventional beam splitter; Figure 3B is a cross-sectional view showing Figure 3A. The intention obtained in the A direction is shown in FIG. 3C, which is a cross-sectional view showing a schematic diagram of a light spot obtained on the BB section in FIG. 3A; and FIG. 4 is a schematic diagram showing an off-axis type (off- axis) reflection type liquid crystal (LC0S) projection device, FIG. 5A is a top view showing the off-axis optical design of the beam splitter; FIG. 5B is a cross-sectional view showing FIG. 5A, obtained from the C direction Figure 5C is a cross-sectional view showing the light spot obtained on the D-D section in Figure 5 A; Figure 6 is a cross-sectional view showing a horizontal gradient beam splitter , A schematic diagram for off-axis optical design; and
第7圖為一截面圖，繪示一斜向漸變式分光鏡，用於 離軸式光學設計之一示意圖。 H 圖式標記說明： 1 0 2 :光源Fig. 7 is a cross-sectional view showing an obliquely progressive beam splitter for use in an off-axis optical design. H Schematic mark description: 1 0 2: light source
12281twf.ptd 第20頁 200525173 圖式簡單說明 1 04 :白光 1 0 6 :濾光片 1 0 8 :分色透鏡 1 1 0 :分色鏡 114 、 124 、 126 、 128 :反射鏡 1 1 2 :紅光 1 1 6、1 3 0、1 4 4 :偏極化分光鏡 118、132、146、200 ·反射式液晶面板 1 2 0 :偏極後之紅光 1 2 2 :綠光 1 3 4 :偏極後之綠光 0 1 4 2 :藍光 1 4 8 :偏極後之藍光 1 5 2 :合光稜鏡 1 5 4 :變焦透鏡 162 、 164 :反射面 3 0 2 :光線 3 0 4 :分光鏡 3 0 6 :反射面 3 1 2 :光斑 4 0 2 :光源 4 0 4 :分色鏡 4 0 6 :紅光 4 0 8 :綠光12281twf.ptd Page 20 200525173 Brief description of the drawings 1 04: White light 1 0 6: Filter 1 0 8: Dichroic lens 1 1 0: Dichroic mirror 114, 124, 126, 128: Mirror 1 1 2: Red light 1 1 6, 1 3 0, 1 4 4: Polarized beam splitters 118, 132, 146, 200 · Reflective LCD panel 1 2 0: Red light after polarizing 1 2 2: Green light 1 3 4 : Green light after polarizing 0 1 4 2: Blue light 1 4 8: Blue light after polarizing 1 5 2: Combined light 1 5 4: Zoom lenses 162 and 164: Reflective surface 3 0 2: Light 3 0 4 : Beamsplitter 3 0 6: Reflective surface 3 1 2: Light spot 4 0 2: Light source 4 0 4: Dichroic mirror 4 0 6: Red light 4 0 8: Green light
12281twf.ptd 第21頁 200525173 Φ 圖式簡單說明 410 藍光 412 極化 片 414 反射 式液晶面板 416 偏檢 片 418 合光 稜鏡 502 光線 504 分光 鏡 506 反射 面 512 光斑 6 0 2、 、7 0 2 : :反射面 6 0 4 、 、7 0 4 : :直線 E 、F :箭號12281twf.ptd Page 21 200525173 Φ Simple description of the diagram 410 Blue light 412 Polarizer 414 Reflective LCD panel 416 Polarizer 418 Combined light 502 Light 504 Beamsplitter 506 Reflective surface 512 Light spot 6 0 2, 、 7 0 2 :: Reflective surface 6 0 4, 7 0 4:: Line E, F: Arrow
12281twf.ptd 第22頁12281twf.ptd Page 22
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