299886 經濟部中央標準局員工消費合作社印製 A7 B7 五、發明説明（1 ) 本發明係有關於應用於液晶投影系統之多區鍍膜雙色 鏡，特別是有關於一種多區鍍膜雙色鏡，其表面經區分爲 至少兩個各別的區域，而每一區塗覆以不同之雙色塗層， 據此，因入射光入射角變動造致的色彩非均勻問題得以減 少甚或得以消弭。 習知三片式液晶投射系統裡，係藉由兩個雙色鏡將白 色光源分爲紅光、綠光和藍光，而紅藍綠光在通過液晶板 後’經過另外兩個雙色鏡而互爲混合，然後藉由一投影鏡 頭投射及於螢幕。然而，源自白色光源之個別光線並非全 然平行，因而在光線行經液晶板每一點時，每一入射光線 的入射角並不相同，而入射光不同的入射角造成不同的光 譜，導致隨後行經雙色鏡後及於投射螢幕呈非均勻色彩。 而源自白色光源的光線非能平行的因素，係因光源並非爲 一實際的點光源，意即光的源點並不落於拋物狀反射鏡的 焦點上，因此，經反射鏡反射之光線呈發散角度，即如第 1圖所示，當光線12和14及於雙色鏡16時，產生不同的 透射光譜及反射光譜，而光線的入射角越大，其光譜更會 偏移至較短波長處，此光譜偏移造成螢幕不同位置處呈非 均勻色彩的問題，意即相同色彩在螢幕不同位置處呈現差 異。 現在請參照第2圖，所示爲投影系統之一雙色鏡22、 一液晶板18、一聚光透鏡20、以及一入光瞳24。若雙色 鏡22法線方向與光軸間之角度爲39。，而位於液晶板18 頂部邊緣和底部邊緣（就是U點和L點）的光錐之中心光線 3 本紙張尺度適用中關家標率（CNS )八4胁（210X297公釐)----- ---------1 -裝------訂-----1 踝 (請先閲讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 A7 ______— B7 五、發明説明（2 ) ~~' -- 通過液晶板18中央C點的光錐之中心光線夾角”以下式 計算得： Θ = ί3ϊΓΐ( (69/2)/ 201) = 9.7394。 當入射光之入射角爲39»時，則雙色鏡22之透射光 譜不於$ 3 ϋ ’此光譜經本發明採用做爲基光譜㈣e spectrum)或未校正光譜（unc〇rrecte£j spectrum)。假若雙色 鏡22是一綠光透射鏡，而爲一紅/藍光反射鏡，則當入射 光之入射角每增加（或減少）丨。時，光譜會向較短（或較長） 波長偏移1.4mn。如是，通過液晶板18上€、u、L三點， 再經過聚光透鏡20之三個光錐中的每一個，其入射於雙色 鏡22之入射角得以電腦計算出，而三個光錐之每一個的乎 均光譜經計算得並示於第4圖，可知左、右、中間光譜的 截止波長约具有13.6nm的偏差，由第5圖所示之αΕ 1931(x，y)色相圖知，此三色彩光譜具相當大的色彩變動 量。 因此，本發明之一目的，在於提供應用於液晶投影系 統之一自我補償雙色鏡，可避免習知雙色鏡的缺點。 本發明之另一目的，在於提供—種應用於液晶投影系 統之一多區鍍膜雙色鏡，其經區分呈若干鍍膜區。 本發明之再一目的，在於提供一種應用於液晶投影系 統之一多區鍍膜雙色鏡，經區分呈至少兩個鍍膜區，每一 鍍膜區具有不同之雙色塗層。 本發明再另有一目的，在於提供一種應用於液晶投影 系統之一多區鍍膜雙色鏡，經區分呈至少兩個鍍膜區， * -裝------訂-----丄龈 (請先閲讀背面之注意事項再填寫本頁) 4 293386 A7 B7 經濟部中央樣準局員工消費合作社印製 五、發明説明（3 ) 一鍍膜區係用以補偾因及於液晶板之入射角變動所造致之 色彩變動。 本發明尚另有一目的，在於提供一種應用於液晶投影 ***之多區鍍膜雙色鏡，經區分爲至少兩個鍍膜區，每一 鍍膜區係用以對色彩變動進行補償，致使投射於螢幕的影 像呈更爲均勻的色彩。 本發明仍另有一目的，在於提供一種應用於液晶投影 系統之多區鍍膜雙色鏡，經區分具有三個鍍膜區，每一者 具有不同之雙色塗層。 本發明仍再另有一目的，在於提供一種應用於液晶投 影系統之多區鍍膜雙色銳，經區分成兩個鏡膜區，其一者 係對色彩變動呈正補償，另一者則對色彩變動呈負補償。 本發明尚再另一目的，在於提供一種應用於液晶投影 系統之多區鍍膜雙色鏡，則經多區鍍膜雙色鏡產生之色彩 係精密地落於一 CIE 1931(x,y)色相圖上。 而根據本發明應用於液晶投影系統之多區鍍膜雙色 鏡，可產生更佳色彩均勻度的投射影像。 在本發明之較佳實施例裡，雙色鏡經區分成兩個鍍膜 區。而第一鍍膜區經塗覆有第一雙色塗層，係對入射光角 度變動造致的色彩變動予以正補償；以及第二鍍膜區經塗 覆有第二雙色塗層，係對入射光角度變動造致的色彩變動 進行負補償。而經第一和第二鍍膜區產生之色彩，得以落 於CIE1931(x,y)色相圖上，意即由此二鍍膜區產生呈現於 螢幕之色彩變動可減至最低。 5 本紙張家標準（CNS…祕（2獻297公幻 --------A.' I 裝------訂-----一線 (請先閲讀背面之注意事項再填寫本頁) ， A7 A7 經濟部中央樣準局員工消費合作社印製 五、發明説明（4 而在另一實施例内，應用於液晶投影系統之雙色鏡被 區分爲三個鍍膜區，用以產生較佳色彩均勻度的投射影 像，此雙色鏡包括：經第一雙色塗層塗覆之第一區、經第 二雙色塗層塗覆之第二區、以及經第三雙色塗層塗覆之第 二區。每一塗層係用以補償因入射光角度變動造致之色彩 變動，得以產生均勻色彩。 雙色塗層一般是以氧化鈦及氧化矽等薄膜疊成具有介 於約20〜40層的全段厚度而得，此等薄膜係塗覆於玻璃或 其它適用材質基底上，而大多數雙色鏡者對紅綠藍光之一 者具穿透性。 爲讓本發明之上述目的、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，作詳細説明 如下： 圖式之簡單説明： 第1圖係顯示用以説明習知液晶投影系統運用雙色鏡 的示意圖； 第2圖係顯示第丨圖液晶投影系統的放大示意圖； 第3圖係顯示綠光之標準透射率對波長的曲線圖； 第4圖係顯示習知液晶投影系統之透射率對波長的曲 線圖； 第5圖係顯示第4圖三條曲線之CIE 1931(x，w色相 圖； 第6圖係顯示本發明較佳實施例的平面圖，其中，雙 色鏡經區分成兩個雙色鍍膜區； ^ 1裝------訂-----線 (請先閲讀背面之注意事項再填寫本頁)299886 A7 B7 printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 5. Description of the invention (1) The present invention relates to a multi-region coated bichromatic mirror applied to a liquid crystal projection system, in particular to a multi-region coated bichromatic mirror, the surface of which After being divided into at least two separate areas, and each area is coated with a different two-color coating, the problem of color non-uniformity caused by the change of the incident angle of the incident light can be reduced or even eliminated. In the conventional three-chip LCD projection system, the white light source is divided into red light, green light and blue light by two dichromatic mirrors, and the red, blue and green light passes through the other two dichromatic mirrors after passing through the liquid crystal panel Mix and then project onto the screen through a projection lens. However, the individual light rays from the white light source are not completely parallel, so when the light rays pass through each point of the liquid crystal panel, the incident angle of each incident light ray is not the same, and the different incident angles of the incident light cause different spectrums, resulting in subsequent passing through the double Non-uniform colors appear behind the mirror and on the projection screen. The reason that the light from the white light source cannot be parallel is because the light source is not an actual point light source, which means that the source point of the light does not fall on the focus of the parabolic mirror, so the light reflected by the mirror At a divergent angle, that is, as shown in Figure 1, when the light rays 12 and 14 reach the dichroic mirror 16, different transmission and reflection spectra are generated, and the greater the angle of incidence of the light, the more the spectrum will shift to a shorter wave For strengths, this spectral shift causes the problem of non-uniform colors at different locations on the screen, meaning that the same colors appear different at different locations on the screen. Referring now to FIG. 2, a dichroic mirror 22, a liquid crystal panel 18, a condenser lens 20, and an entrance pupil 24 are shown. If the angle between the normal direction of the dichroic mirror 22 and the optical axis is 39. , And the central light of the light cone located at the top and bottom edges of the LCD panel 18 (that is, the U point and the L point) 3 This paper scale is applicable to the Zhongguanjia standard rate (CNS) 8 4 threats (210X297 mm) ------ -------- 1 -installed ------ order ----- 1 ankle (please read the precautions on the back before filling out this page) A7 ______ printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs — B7 V. Description of the invention (2) ~~ '-Calculated by the angle of the central ray of the light cone at the center C of the liquid crystal panel 18 ”is calculated as follows: Θ = ί3ϊΓΐ ((69/2) / 201) = 9.7394. When the incident angle of the incident light is 39 », the transmission spectrum of the dichroic mirror 22 is not less than $ 3. This spectrum is adopted by the present invention as a base spectrum (e spectrum) or an uncorrected spectrum (uncorrrecte £ j spectrum). If the dichromatic color The mirror 22 is a green light transmission mirror and a red / blue mirror, each time the incident angle of the incident light increases (or decreases), the spectrum will shift to a shorter (or longer) wavelength by 1.4mn If so, through the three points of €, u, L on the liquid crystal panel 18, and then through each of the three light cones of the condenser lens 20, it is incident on the dichroic mirror 22 The angle of incidence can be calculated by the computer, and the almost average spectrum of each of the three light cones is calculated and shown in Figure 4. It can be seen that the cutoff wavelengths of the left, right, and middle spectra have a deviation of about 13.6nm. The shown αΕ 1931 (x, y) hue diagram shows that the three-color spectrum has a considerable amount of color variation. Therefore, one object of the present invention is to provide a self-compensating dichromatic mirror applied to a liquid crystal projection system, which can be avoided The disadvantages of conventional dichromatic mirrors. Another object of the present invention is to provide a multi-region coated dichromatic mirror applied to a liquid crystal projection system, which is divided into a number of coated areas. Another object of the present invention is to provide an application It is a multi-region coated bichromatic mirror in one of the liquid crystal projection systems, which is divided into at least two coating regions, each of which has a different two-color coating. Another object of the present invention is to provide one more application for liquid crystal projection systems Zone-coated two-color mirror, which is divided into at least two coated zones, * -installed ------ ordered ----- toggle (please read the precautions on the back before filling this page) 4 293386 A7 B7 Ministry of Economic Affairs Central sample Printed by the Bureau ’s Consumer Cooperatives V. Description of the invention (3) A coating area is used to compensate for color changes caused by changes in the angle of incidence of the liquid crystal panel. The present invention has yet another object to provide a liquid crystal application The multi-zone coated bichromatic mirror of the projection system is divided into at least two coated areas, and each coated area is used to compensate for color changes, so that the image projected on the screen has a more uniform color. The present invention still has another object It is to provide a multi-region coated dichroic mirror applied to a liquid crystal projection system, which is divided into three coated regions, each of which has a different dichromatic coating. Still another object of the present invention is to provide a multi-zone coating dual color sharpness applied to a liquid crystal projection system, which is divided into two mirror film areas, one of which is to positively compensate for color changes, and the other to color changes Negative compensation. Yet another object of the present invention is to provide a multi-coated dichroic mirror applied to a liquid crystal projection system. The color produced by the multi-coated dichroic mirror precisely falls on a CIE 1931 (x, y) hue diagram. According to the present invention, the multi-coated dual-color mirror applied to the liquid crystal projection system can produce a projection image with better color uniformity. In the preferred embodiment of the present invention, the dichromatic mirror is divided into two coated areas. The first coating area is coated with a first two-color coating to positively compensate for color changes caused by the incident light angle; and the second coating area is coated with a second two-color coating to measure the incident light angle The color change caused by the change is negatively compensated. The colors generated by the first and second coating areas can fall on the CIE1931 (x, y) hue diagram, which means that the color changes generated by the two coating areas and displayed on the screen can be minimized. 5 The standard of this paper (CNS… secret (2 dedicated 297 phantoms -------- A. 'I installed ------ ordered ----- first line (please read the precautions on the back first (Fill in this page), A7 A7 The Ministry of Economic Affairs Central Bureau of Samples and Printed the Consumer Cooperative V. Invention description (4 In another embodiment, the dichroic mirror applied to the LCD projection system is divided into three coating areas for Produces a projected image with better color uniformity. The dichromatic mirror includes: a first area coated with a first two-color coating, a second area coated with a second two-color coating, and a third bicolor coating The second area. Each coating is used to compensate for the color change caused by the angle of the incident light to produce a uniform color. The two-color coating is generally formed by stacking thin films of titanium oxide and silicon oxide between about 20 ~ The full thickness of 40 layers, these films are coated on glass or other suitable material substrates, and most of the dichromatic mirrors are transparent to one of the red, green and blue light. The features and advantages can be more obvious and understandable. The following is a preferred embodiment, in conjunction with the attached drawings, The detailed description is as follows: Brief description of the drawings: Figure 1 shows a schematic diagram illustrating the use of a dichromatic mirror in a conventional LCD projection system; Figure 2 shows an enlarged schematic diagram of the LCD projection system in Figure 丨; Figure 3 shows The graph of the standard transmittance of green light versus wavelength; Figure 4 is a graph showing the transmittance of conventional liquid crystal projection systems versus wavelength; Figure 5 is the CIE 1931 (x, w hue diagram of the three curves of Figure 4 Figure 6 is a plan view showing a preferred embodiment of the present invention, in which the two-color mirror is divided into two two-color coating areas; ^ 1 installed ------ order ----- line (please read the back side first (Notes and then fill this page)
經濟部中央標準局員工消費合作社印製 A7 _B7_ 五、發明説明（5 ) 第7圖係顯示第6圖經雙色鏡補償後之透射率對波長 的曲線圖； 第8圖係顯示經本發明雙色鏡補償後，用以表示三個 個別點處呈較佳色彩均勻度的CIE 1931(x,y)色相圖； 第9圖係顯示本發明另一實施例的平面圖，其中，雙 色鏡經區分爲三個鍍膜區； 第10圖係顯示第9圖經雙色鏡補償後之透射率對波長 的曲線圖；以及 第11圖係顯示第10圖三個個別點處呈較佳色彩均勻 度的色圖。 實施例： 本發明提供可應用於液晶投射系統之一多區鍍膜雙色 鏡，其中，雙色鏡經區分成至少兩個鍍膜區，而能產生較 佳色彩均勻度之投射影像。 現在請參照第6圖，所示本發明之雙色鏡30經區分爲 兩個鍍膜區32和34，此二鍍膜區32和34每一者均具有 不同的雙色塗層。而雙色塗層大抵是以20至40層具高折 射率薄膜及具低折射率薄膜交替建構而得，本發明之該等 薄膜是塗覆於一玻璃板或其餘適用之基底上，重要的是薄 膜所採用的材質需具有接近玻璃板的熱膨脹係數，以避免 溫度變化時彎曲或剥離的問題。本發明雙色塗層是以具高 折射率的氧化鈦（折射率爲2.55)和具低折射率之氧化矽（折 射率爲1.46)形成，僅須適當選擇薄膜厚度及層數，則入射 光得以任意入射角於某特定波長範圍内透射或反射。 本紙張尺度適用中國國家標準（CNS ) Α4規格（210X 297公釐） ----------^ -裝------訂------ί線 (請先閲讀背面之注意事項再填寫本頁) 經濟部中央標隼局貝工消費合作社印製 ^93886 A7 ______ B7 五、發明説明（6 ) 如第6圖所示，雙色鏡3〇约具有75πιπ1之長度，若以 其中心線爲座標0，則-37.5mm至Omm間之雙色塗層，呈 第3圖所示之光譜，唯其向較長波長偏移了（角度X(1.4nm/ 度)）’必須注意1 4nm/度是平均偏差，對綠光而言，偏差 範圍約是介於1.2〜1.7nm/度，就全般色彩而言，其偏差範 園是介於1.0〜2.0nm/度間。然介於0mm和37.5mm間之雙 色塗層’其光譜是向較短波長偏移了（角度X(1.4nm/度)）， 因此，當角度爲1〇°時，第4圖之三個光譜便能互爲接近 得如第7圖所示之結果，而其相對應之cie 1931(x，y)色相 圖則如第8圖所示。若以第7圖和第4圖相較，此三光譜 較爲接近’因此，在不同點處可獲致較均勻的色彩，相同 的結論亦可由第8圖和第5圖相較得，第8圖所示U、L、 C點之色彩座標較示於第5圖者更爲接近。 如第9圖所示，另一實施例之雙色鏡40係區分爲三個 銀膜區，此雙色鏡40區分爲鍍膜區L42、44和46。而鍍 膜區42(介於l2.5nm至37.5nm)之雙色塗層具有與介於 -12.5和12.5nm間（對39。之入射角者）之鍍膜區相同之透 射率’其光譜係向較短波長偏移（角度X(l,4nm/度)）。而介 於-12.5至_37.5nm間之光譜係向較長波長偏移（角度X (l.4nm/度））。第1〇圖所示u、C、L點處的光譜較第7圖 或習知之第4圖更具提昇的效果，而第11圖所示之色彩座 標圖所示之三個座標亦互爲靠近。 本發明已揭示將一雙色鏡區分爲至少兩個鍍膜區，並 經塗覆以不同之雙色塗層，據此，因入射光入射角變動造 本紙張尺度適用中國國家橾準（CNS )以規格（210X297公釐） ------------{-裝------訂-----丄抹 (請先閱讀背面之注意事項再填寫本頁) A7 B7 五、發明説明（7 ) 致的色彩變動可減至最少甚或消弭。 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，任何熟習此項技藝者，在不脱離本發明之精神和 範圍内，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爲準。 J -I I 訂 4 線 (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐）A7 _B7_ printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 5. Description of the invention (5) Figure 7 shows the curve of the transmittance versus wavelength after the compensation of the dichromatic mirror in Figure 6; the figure 8 shows the dichromatic mirror in accordance with the invention After compensation, the CIE 1931 (x, y) hue diagram used to indicate better color uniformity at three individual points; Figure 9 is a plan view showing another embodiment of the present invention, in which the dichroic mirror is divided into three Fig. 10 is a graph showing the transmittance versus wavelength of Fig. 9 compensated by a dichromatic mirror; and Fig. 11 is a color chart showing better color uniformity at three individual points in Fig. 10. Embodiments: The present invention provides a multi-region coated dichromatic mirror that can be applied to a liquid crystal projection system. The dichromatic mirror is divided into at least two coated regions to produce a projected image with better color uniformity. Referring now to FIG. 6, the dichroic mirror 30 of the present invention is shown divided into two coating regions 32 and 34, each of which has a different two-color coating. The two-color coating is probably constructed by alternating 20 to 40 layers of high-refractive-index films and low-refractive-index films. The films of the present invention are coated on a glass plate or other suitable substrates. The important thing is The material used for the film needs to have a coefficient of thermal expansion close to that of the glass plate to avoid the problem of bending or peeling when the temperature changes. The two-color coating of the present invention is formed of titanium oxide with a high refractive index (refractive index of 2.55) and silicon oxide with a low refractive index (refractive index of 1.46). Only by appropriately selecting the film thickness and the number of layers, the incident light can be Any incident angle is transmitted or reflected in a specific wavelength range. This paper scale is applicable to China National Standard (CNS) Α4 specification (210X 297mm) ---------- ^ -installed ------ ordered ------ ί line (please read first Note on the back and then fill out this page) Printed by the Beigong Consumer Cooperative of the Central Standard Falcon Bureau of the Ministry of Economic Affairs ^ 93886 A7 ______ B7 5. Description of the invention (6) As shown in Figure 6, the dichromatic mirror 30 has a length of about 75πιπ1, If the center line is used as the coordinate 0, the two-color coating between -37.5mm and Omm shows the spectrum shown in Figure 3, but it shifts to a longer wavelength (angle X (1.4nm / degree)) ' It must be noted that 14 nm / degree is the average deviation. For green light, the deviation range is about 1.2 ~ 1.7nm / degree. For the general color, the deviation range is 1.0 ~ 2.0nm / degree. However, the two-color coating between 0mm and 37.5mm's spectrum is shifted to a shorter wavelength (angle X (1.4nm / degree)), therefore, when the angle is 10 °, the third of Figure 4 The spectra can be close to each other as shown in Figure 7, and the corresponding cie 1931 (x, y) hue diagram is shown in Figure 8. If you compare Figure 7 with Figure 4, the three spectra are closer to each other. Therefore, more uniform colors can be obtained at different points. The same conclusion can also be obtained from Figure 8 and Figure 5. The color coordinates of points U, L, and C shown in the figure are closer than those shown in figure 5. As shown in FIG. 9, the dichroic mirror 40 of another embodiment is divided into three silver film regions, and the dichroic mirror 40 is divided into coating regions L42, 44 and 46. The two-color coating of the coating area 42 (between 12.5nm and 37.5nm) has the same transmittance as the coating area between -12.5 and 12.5nm (for the angle of incidence of 39.) Short wavelength shift (angle X (1,4nm / degree)). The spectrum between -12.5 and _37.5nm shifts to a longer wavelength (angle X (1.4nm / degree)). The spectrum at points u, C, and L shown in Figure 10 is more improved than that in Figure 7 or the conventional Figure 4, and the three coordinates shown in the color coordinate diagram shown in Figure 11 are also mutually near. The present invention has disclosed that a dichromatic mirror is divided into at least two coated areas, and is coated with different dichromatic coatings. According to the incident light angle change, the paper size is applicable to China National Standards (CNS) for specifications (210X297mm) ------------ {-installed ------ ordered ----- to wipe (please read the precautions on the back before filling this page) A7 B7 5 5. Description of the invention (7) The color change caused by it can be minimized or even eliminated. The present invention has been disclosed as above with preferred embodiments, but it is not intended to limit the present invention. Anyone who is familiar with this skill can make some changes and retouching without departing from the spirit and scope of the present invention. The scope of protection of an invention shall be deemed as defined by the scope of the attached patent application. J-I I order 4 lines (please read the notes on the back before filling in this page) Printed by the Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs This paper standard is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm)