1289689 (1) 玖、發明說明 【發明所屬之技術領域】 本發明爲有關適用於投射型液晶顯示裝置之光學補償 板，同時，亦關於使用此之投射型液晶顯示裝置。 【先前技術】 投射型液晶顯示裝置，亦稱之爲液晶投影機，係做爲 個人電腦或電視等之畫面放大，而可呈現於螢幕之裝置而 加以廣泛所使用。 對投射型液晶顯示裝置，係具有以單片式直接放大從 彩色濾光片之分光形式，和於三原色分光之後，通過對應 於各個的光之透過型液晶單元形式，和於三原色分光之 後，於對應於各個的光之反射型液晶單元反射形式。於 此，有關目前主流所使用三原色對應之透過型液晶單元之 投射型液晶顯示裝置，茲參照圖6同時說明其槪略構造。 如此之投射型液晶顯示裝置，一般而言其具有光源系 統，反射·分光系統，及放大投射系統。光源系統具有白 色光源及UV · IR防過濾片13，而從白色光源1 1之白色 光丄係以.UV · IR防過濾片13過濾紫外線及紅外線，而 能夠傳送於第1分色稜鏡。白色光源11通常則使用金屬 光源燈泡，或高壓水銀燈泡等。 反射·分光系統其具有4種類之分色稜鏡1’ 2’ 3’ 4，和二個之權反射鏡5，6，和對應於各紅色光R，綠色 光G及藍色光B之液晶單元7R，7G及7B，和入射側偏 -4 - (2) 1289689 光變換元件8R，8G及8B，和射出側偏光變換元f 9G及9Β，及集光透鏡10R，10G及10Β。 且，第1分色稜鏡1僅透過綠色光G及藍色先 過此之綠色光G及藍色光Β，係傳送於第2分色稜 第1分色稜鏡所反射之紅色光R，係傳送於第1 鏡，於此反射之後，透過紅色用之集光透竟1 OR， 側偏光變換元件8R，和液晶單元7R及射出側偏光 件9R，傳送於第3之分色稜鏡。一方面，第2分隹 爲僅透過藍色光B者，透過第1分色稜鏡1之綠色 和於藍色光B之中，透過第2分色稜鏡2之藍色光 透過藍色用之集光透鏡1 0B，入射側偏光變換元例 液晶單元7B及射出側偏光變換元件9B，傳送於第 射鏡片6。同時，於第2分色棱鏡2所反射的綠色 係過綠色用之集光透鏡1 0G，入射側偏光變換元付 液晶單元7G及射出側偏光變換元件9G，傳送於第 稜鏡。第3分色稜鏡3爲僅透過色光者，從第1全 片5，紅色用集光透鏡1 OR，入射側偏光變換元件 晶單元7R及通過射出側偏光變換元件9R之紅色光 直接透過第3分色稜鏡3,同時，從第2分色稜鏡 色用集光透鏡10G，入射側偏光變換元件8G，液 7G及通過射出側偏光變換元件9G之綠色光G，係 分色稜鏡3反射，往各第4分色稜鏡4傳送。第4 鏡4爲僅透過紅色光R及綠色光G者.，從第3分色 之紅色光R及綠色光G既直接透過於此，而從第 牛9R， :B，透 鏡。於 全反射 和入射 變換元 i稜鏡2 光G， B，係 二 8B， 2全反 光G， :8G， 3分色 反射鏡 8R，液 R，既 2 ’綠 晶單元 於第3 分色稜 t棱鏡3 2全反 -5- (3) 1289689 射鏡片6之藍色光B於此反射，往各投射透鏡16傳^ 同時，於此，首先係表示將紅色光R分光，其次 將綠色光G和藍色光B作成分光形式，但是藉由分 鏡之組合使得可任意變更分光順序。 放大投射系統，其具有投射透鏡1 6，於此，放 應於各各的光之畫像，而能夠於螢幕1 7投影放大像 時，對應於各色之液晶單元7R，7G，7B之入射側偏 換元件8R，8G，8B，及射出側偏光變換元件9R， 9B，係貼合於液晶單元7R，7G，7B而加以使用，但 般而言，係與液晶單元7R，7G，7B距離間隔而加 置，此間隔爲冷卻用之通風路。再者，入射側偏光變 件 8R，8G，8B，亦與集光透鏡 10R，10G，10B保 隔。如此，將偏光變換元件 8R，8G，8B，9R，9G 從集光透鏡l〇R，l〇G，10B分離而配置時，直線偏 係以貼合於玻璃等之補強材料形態而加以使用之。 於如此投射型液晶顯示裝置之中，各液晶單元 7G，7B係各2片偏光變換元件，亦既，配置於入射 光變換元件8R，8G，8B及射出側偏光變換元件 9G，9B之間。此等之偏光變換元件8，9對於將畫像 於螢幕而投射，由於需透過必要之光量，故熱氣較爲 同時，若紅色光R，綠色光G及/或藍色光B爲偏 時，入射於液晶單元7R，7G，7B時，產生旋轉偏光 必要者較爲多。再者，從液晶單元7R，7G，7B射出 光光，亦具有再度旋轉偏光面時候。 ，係 色稜 大對 。同 光變 9G， 是一 以配 換元 持間 ，9B 光板 7R， 側偏 9R， 放大 多。 光光 面之 之偏 -6 - (4) 1289689 爲了旋轉偏光面，使用相位差板既可，相位差板通常 係配置於入射側偏光變換元件 8 R，8 G，8 B之光源1 1 側，或是射出側偏光變換元件9R，9G，9B之投射透鏡 1 6側。做爲相位差板，從亦於取得度或價格等視之，通 常爲使用樹脂製者。此相位差板於於入射側偏光變換元件 8R，8G，8B，或是射出側偏光變換元件9R，9G，9B之 中，係以貼合於直線偏光板之形狀而加以使用之。 如此之投射型液晶顯示裝置，由於受到液晶單元之複 折射性之影響，具有降低投影於螢幕畫像之對比問題。因 此，於特開2000- 1 3 7202號公報（專利文獻1 )，係揭示 著於投射型液晶顯示裝置之中，將於畫像成分之畫像面內 分部之對比，或明亮度之偏差，藉由光學補償層而給予緩 和。同時，於特開2000-352615號公報（專利文獻2)， 揭示著於平均線膨脹係數之絕對値較爲小之玻璃貼附偏光 板，將此使用於投射型液晶顯示裝置之入射側或是射出側 偏光變換元件，且，亦揭示著於入射側偏光變換元件和射 出側偏光變換元件之間，於距離任一之偏光板位置，配置 液晶單元以外之光學性異方體。做爲此等之光學補償層至 光學異方體，係使膽固醇綜合配向，譬如，舉出如揭示於 特開平8-50206號公報（專利文獻3 )之例子。於此等專 利文獻1及專利文獻2所具體揭示之構造，係於液晶單元 之正反兩側各配置1片光學補償層或是光學異方體，更於 各外側，各配置1片偏光板。另外，於特開2002- 1 4345 號公報（專利文獻4)揭示出於液晶單元之光射出側設置 -7- (5) 1289689 光學補償層，進行對存在於液晶層之光入射側領域之液晶 分子的光學補償，亦揭示其光學補償層係重疊2片或3 片。但是，·揭示於此等專利文獻1，專利文獻2及專利文 獻3之光學補償層，或是使用光學異方體之投射型液晶顯 示裝置，已具有於暗顯示之色斑點顯著之問題。 [專利文獻1]特開2000- 1 3 7202號公報 [專利文獻2]特開2000-352615號公報 [專利文獻3]特開平8-50206號公報 [專利文獻4]特開2002- 1 4345號公報 本發明者，爲了更提高投射型液晶顯示裝置之對比， 即使於長時間使用亦不易於暗顯示產生色斑點，因此欲開 發可實現將高顯示品質使用於長時間之光學補償板，而進 行硏究。結果，發現出一種光學彈性係數較爲小，且於空 氣接觸面具有反射防止層之透明薄膜，和於基材薄膜塗佈 液晶性化合物而成之光學補償薄膜，和以作成堆積透明等 玻璃板之構造，不會於投射於螢幕之畫像暗顯示產生色斑 點，而可維持涵蓋長時間之高品質畫像顯示，而硏致本發 明。 【發明內容】 亦既，本發明之光學補償板系具有7 X l(T13cm2/dyne 以下之光彈性係數，於表面形成反射層之透明薄膜，和於 基材薄膜，塗佈液晶性化合物而成之光學補償薄膜，和透 明玻璃板，皆堆積於透明薄膜之反射層之最外側。 -8- (6) 1289689 此光學補償板，係組立於投射型液晶顯示裝置而加以 使用。因此，本發明同時，亦提供上述之光學補償板配置 於液晶單元之至少一方側而成之投射型液晶顯示裝置。此 投射型液晶顯示裝置，更具體而言，具有白色光源，和包 含爲了將從白色光源之白色光分光成紅色光，綠色光及藍 色光之三原色的光之分色稜鏡護層之光學系統，和液晶單 元，和偏光變換元件，及上述光學補償板。此種情況之光 學系統，譬如，乃具有爲了將從白色光源之白色光分光成 紅色光，綠色光及藍色光之三原色的光之分色稜鏡，和全 反射鏡片及集光透鏡。 【實施方式】 以下爲詳細說明本發明。於本發明之中，於表面具有 反射防止層，且，使用光彈性係數較爲小之透明薄膜。此 透明薄膜係由光彈性係數爲7x 1 (T13cm2/dyne以下之樹脂 薄膜所形成。此透明樹脂薄膜之光彈性係數，最好爲6 X l(T13Cm2/dyrie以下。藉由使用由如此光彈性係數較小之 樹脂所形成之透明薄膜，使得可避免藉由薄膜之熱變形及 歪斜所產生之相位差。若此光彈性係數比 7x10· I3cm2/dyne爲大時，將產生藉由熱所導致之歪斜之新的相 位差，由於偏光散亂，故易於畫像產生色斑點。同時，光 彈性係數之下限無特定界定，譬如即使光彈性係數爲0.1 xl(T13cm2/dyne程度之樹脂亦可。 所謂光彈性係等方性，亦既於複折射爲0之物質上， (7) 1289689 施予外例使內部發生反應力時，呈現出光學異方性，稱之 爲表示複折射之現象。將作用於物質之反應力（作用於每 單位面積之力）設爲σ，而複折射設爲Δη時，理論上反 應力σ，和複折射△ η係呈現比例關係：可表示△ η = C σ，此C既爲光彈性係數。換言之，當作用於物質之反 應力σ爲橫軸，其作用力時之複折射Δη爲從軸時，理論 上，兩者爲直線關係，此直線之斜率爲光彈性係數。1289689 (1) Field of the Invention The present invention relates to an optical compensation plate suitable for use in a projection type liquid crystal display device, and also relates to a projection type liquid crystal display device using the same. [Prior Art] A projection type liquid crystal display device, which is also referred to as a liquid crystal projector, is widely used as a device for displaying a screen on a personal computer or a television. The projection type liquid crystal display device has a spectroscopic form in which a color filter is directly amplified by a single chip, and after being split by the three primary colors, through a form of a transmissive liquid crystal cell corresponding to each light, and after being split by the three primary colors, Corresponding to the reflection form of each of the light-reflecting liquid crystal cells. Here, the projection type liquid crystal display device of the transmissive liquid crystal cell corresponding to the three primary colors currently used in the mainstream will be described with reference to Fig. 6 at the same time. Such a projection type liquid crystal display device generally has a light source system, a reflection/light splitting system, and an enlarged projection system. The light source system has a white light source and a UV · IR filter 13 , and the white light source of the white light source 11 filters the ultraviolet rays and the infrared rays with the .UV · IR filter 13 to be transmitted to the first color separation. The white light source 11 usually uses a metal light source bulb, or a high pressure mercury bulb or the like. The reflection/dispensing system has four types of color separations '1' 2' 3' 4, and two weighted mirrors 5, 6, and liquid crystal cells corresponding to the respective red light R, green light G, and blue light B. 7R, 7G and 7B, and incident side offset -4 - (2) 1289689 optical conversion elements 8R, 8G and 8B, and output side polarization conversion elements f 9G and 9 Β, and collecting lenses 10R, 10G and 10 Β. Further, the first color separation 稜鏡1 transmits only the green light G and the blue light G and the blue light ray, and is transmitted to the red light R reflected by the first color separation ridge first color separation ,. After being reflected, the first mirror is transmitted through the red light collection unit 1 OR, the side polarization conversion element 8R, and the liquid crystal unit 7R and the output side polarizer 9R, and transmitted to the third color separation unit. On the other hand, the second minute is the only one that transmits the blue light B, and the blue color that passes through the first color separation 稜鏡1 and the blue light B, and the blue light that passes through the second color separation 稜鏡2 passes through the blue color. The optical lens 10B, the incident side polarization conversion element liquid crystal cell 7B, and the output side polarization conversion element 9B are transmitted to the first lens 6. At the same time, the green light-collecting lens 10G, which is reflected by the second dichroic prism 2, is incident on the incident side polarization conversion unit liquid crystal cell 7G and the output side polarization conversion element 9G, and is transmitted to the first pass. The third color separation 稜鏡3 is a light-transmitting only light, and the red light is transmitted from the first full sheet 5, the red light collecting lens 1 OR, the incident side polarization conversion element crystal unit 7R, and the emission side polarization conversion element 9R. In the third color separation 稜鏡3, the second color separation concentrating lens 10G, the incident side polarization conversion element 8G, the liquid 7G, and the green light G passing through the emission side polarization conversion element 9G are color-separated. 3 reflection, and it is transmitted to each 4th color separation 稜鏡4. The fourth mirror 4 is a device that transmits only the red light R and the green light G. The red light R and the green light G from the third color separation are directly transmitted therethrough, and the first cow 9R, :B is a lens. For total reflection and incident conversion elements i 稜鏡 2 light G, B, system 2 8B, 2 full reflection G, : 8G, 3 dichroic mirror 8R, liquid R, both 2 'green crystal unit in the third color separation edge t prism 3 2 all-reverse-5- (3) 1289689 The blue light B of the lens 6 is reflected here and transmitted to each of the projection lenses 16 . Here, first, the red light R is split, and then the green light G is The blue light B is in the form of a component light, but the combination of the split mirrors allows the light splitting order to be arbitrarily changed. An enlarged projection system having a projection lens 16 for placing an image of each of the lights, and capable of projecting the enlarged image on the screen 17 corresponding to the incident side of the liquid crystal cells 7R, 7G, and 7B of the respective colors The replacement elements 8R, 8G, 8B, and the output side polarization conversion elements 9R, 9B are used in combination with the liquid crystal cells 7R, 7G, and 7B, but are generally spaced apart from the liquid crystal cells 7R, 7G, and 7B. Addition, this interval is the ventilation path for cooling. Further, the incident side polarization members 8R, 8G, 8B are also separated from the collecting lenses 10R, 10G, 10B. When the polarization conversion elements 8R, 8G, 8B, 9R, and 9G are separated from the collecting lenses 10R, 10G, and 10B, the linear biasing is applied to a reinforcing material such as glass. . In the projection type liquid crystal display device, each of the liquid crystal cells 7G, 7B is disposed between the incident light conversion elements 8R, 8G, 8B and the output side polarization conversion elements 9G, 9B. The polarization conversion elements 8 and 9 project the image on the screen, and since it is necessary to transmit the necessary amount of light, the hot air is relatively simultaneous. If the red light R, the green light G, and/or the blue light B are biased, the incident is performed. In the case of the liquid crystal cells 7R, 7G, and 7B, it is necessary to generate rotational polarization. Further, when the light is emitted from the liquid crystal cells 7R, 7G, and 7B, the polarized surface is rotated again. , the color of the color is quite right. Same as the light change 9G, it is a replacement with the yuan, 9B light board 7R, side 9R, more magnification. The deviation of the light surface is -6 - (4) 1289689 In order to rotate the polarizing surface, a phase difference plate can be used. The phase difference plate is usually disposed on the side of the light source 1 1 of the incident side polarization conversion element 8 R, 8 G, 8 B Or, the projection lens 16 side of the side polarization conversion elements 9R, 9G, and 9B is emitted. As a phase difference plate, it is usually based on the degree of acquisition or price, and is usually made of resin. The phase difference plate is used in the shape of the linear polarizing plate in the incident side polarization conversion elements 8R, 8G, 8B or the output side polarization conversion elements 9R, 9G, and 9B. Such a projection type liquid crystal display device has a problem of reducing the contrast of projection on a screen image due to the refraction of the liquid crystal cell. In the projection type liquid crystal display device, it is disclosed that the projection of the image component in the image plane of the image component is different from the difference in brightness, and it is disclosed in Japanese Laid-Open Patent Publication No. 2000-133078 (Patent Document 1). The relaxation is given by the optical compensation layer. At the same time, Japanese Laid-Open Patent Publication No. 2000-352615 (Patent Document 2) discloses a glass-attached polarizing plate having a relatively small absolute coefficient of linear expansion coefficient, which is used for the incident side of a projection type liquid crystal display device or The emission side polarization conversion element is also disclosed between the incident side polarization conversion element and the emission side polarization conversion element, and an optical duplex other than the liquid crystal cell is disposed at a position of any of the polarizing plates. In the case of the above-mentioned optical compensation layer to the optical hetero-organism, the cholesterol is integrated, for example, as disclosed in Japanese Laid-Open Patent Publication No. Hei 8-50206 (Patent Document 3). The structures specifically disclosed in Patent Document 1 and Patent Document 2 are arranged such that one optical compensation layer or an optical heterogeneous body is disposed on each of the front and back sides of the liquid crystal cell, and one polarizing plate is disposed on each of the outer sides. . Further, JP-A-2002-1-4345 (Patent Document 4) discloses that a -7-(5) 1289689 optical compensation layer is provided for the light-emitting side of the liquid crystal cell, and liquid crystal is present in the field of the light incident side of the liquid crystal layer. The optical compensation of the molecules also reveals that the optical compensation layer overlaps 2 or 3 slices. However, the optical compensation layer disclosed in Patent Document 1, Patent Document 2, and Patent Document 3, or the projection type liquid crystal display device using an optical heterogeneous body, has a problem that the color spots on the dark display are conspicuous. [Patent Document 1] JP-A-2000-352615 (Patent Document 3) Japanese Patent Publication No. JP-A No. Hei 8-50206 (Patent Document 4) JP-A-2002-1-4345 In order to further improve the contrast of the projection type liquid crystal display device, the inventors of the present invention do not easily display the color spots even when used for a long period of time. Therefore, it is desired to develop an optical compensation plate that can use high display quality for a long period of time. research. As a result, a transparent film having a small optical elastic modulus and having an antireflection layer on the air contact surface, and an optical compensation film formed by coating a liquid crystal compound on the base film, and a glass plate which is formed into a transparent plate are formed. The structure does not display a color spot on the image projected on the screen, and maintains a high-quality image display covering a long time, and the present invention is achieved. SUMMARY OF THE INVENTION The optical compensation plate of the present invention has a photoelastic coefficient of less than T13cm2/dyne, a transparent film which forms a reflective layer on the surface, and a liquid crystal compound coated on the base film. The optical compensation film and the transparent glass plate are stacked on the outermost side of the reflective layer of the transparent film. -8- (6) 1289689 The optical compensation plate is used in a projection type liquid crystal display device. Therefore, the present invention is used. At the same time, a projection type liquid crystal display device in which the optical compensation plate described above is disposed on at least one side of the liquid crystal cell is provided. The projection type liquid crystal display device, more specifically, has a white light source, and is included for the purpose of removing light from a white light source. The white light is split into an optical system of a color separation layer of red light, green light and blue light, and a liquid crystal cell, and a polarization conversion element, and the optical compensation plate described above. Is a color separation 光 for the light of the white light from the white light source into the red, green and blue light, and the total [Embodiment] The present invention will be described in detail below. In the present invention, an antireflection layer is provided on the surface, and a transparent film having a small photoelastic coefficient is used. The coefficient is 7x 1 (formed as a resin film of T13cm2/dyne or less. The photoelastic coefficient of the transparent resin film is preferably 6 X l (T13Cm2/dyrie or less. By using a resin having such a small photoelastic coefficient) The transparent film makes it possible to avoid the phase difference caused by the thermal deformation and skew of the film. If the photoelastic coefficient is larger than 7x10·I3cm2/dyne, a new phase difference due to heat will be generated. Since the polarized light is scattered, it is easy to produce a color spot. At the same time, the lower limit of the photoelastic coefficient is not specifically defined, for example, even if the photoelastic coefficient is 0.1 x 1 (a resin having a degree of T13 cm 2 /dyne), the so-called photoelastic system isotropic, Also, in the case of a compound with a birefringence of 0, (7) 1289689, when an external reaction is applied to cause internal reaction, an optical anisotropy is exhibited, which is called a phenomenon of birefringence. The reaction force of the mass (force acting on a unit area) is set to σ, and when the birefringence is set to Δη, the theoretical reaction force σ and the birefringence Δ η are proportional to each other: Δ η = C σ can be expressed. C is the photoelastic coefficient. In other words, the reaction force σ used as the substance is the horizontal axis, and the complex refraction Δη of the force is the slave axis. In theory, the two are in a linear relationship, and the slope of the line is photoelastic. coefficient.
構成透明薄膜之樹脂玻璃轉移溫度，最好係1 3 (TC以 上，140 °C以上爲更佳。當透明樹脂薄膜之玻璃轉移溫度 爲1 3 (TC以下時，熱變形將爲顯著。而透明樹脂薄膜之玻 璃轉移溫度之上限並無特定限制，譬如，即使玻璃轉移溫 度爲3 00 °C程度之樹脂亦可。The transfer temperature of the plexiglass constituting the transparent film is preferably 1 3 (TC or more, more preferably 140 ° C or more. When the glass transition temperature of the transparent resin film is 1 3 (TC or less, the heat distortion will be remarkable. The upper limit of the glass transition temperature of the resin film is not particularly limited, and for example, a resin having a glass transition temperature of about 300 ° C may be used.
做爲如此之光彈性係數較爲小之樹脂，具體而言，係 舉出將如原波烷之環狀醯作成單體之環狀聚油精系樹脂薄 膜，或是由如原波烷之環狀醯與聚乙烯之共同體所形成之 樹脂薄膜等之例子。做爲環狀聚醯系樹脂薄膜，譬如，有 JASAL公司所販賣之KKK (玻璃轉移溫度約170°C，光彈 性係數約爲4 X 1 (Γ 13 c m 2 / d y n e )，和積水化學公司所販賣 之SCNER (玻璃轉移溫度約140°C，光彈性係數約爲6 X l〇-13cm2/dyne )，和OPTS所販賣之ZONR (玻璃轉移溫 度約136°C，光彈性係數約爲6 xl(TI3Cm2/dyne)。透明 薄膜之厚度，通常爲20"m〜Ιμπι程度，最好爲40〜150μηι 程度。 透明薄膜，其面內之阻尼値最好爲較小，譬如20iim -10· (8) 1289689 以下，再者l〇nm以下特別係5nm以下者爲更佳。—但超 過面內阻尼値爲20nm時，將具有降低畫像顯示品質。同 時，厚度方向之阻尼値最好亦爲較小，譬如50nm以下， 右30nm以下尤其係l〇nm以下者爲更佳。厚度方向之阻 尼値一但超過50nm時，將具有降低畫像顯示品質。於此 所謂面內之阻尼値R及厚度方向之阻尼値Rt，係將於面 內折射率爲最大方向之折射率設爲nx，和於面內與此正 交之方向折射率設爲ny，和厚度方向折射率設爲nz，及 薄膜厚度設爲d時，係以各下式（2)及（3)所定義値。 R = (nx-ny)xd ........(2)As such a resin having a relatively small photoelastic coefficient, specifically, a cyclic polyolein resin film which is a monomer such as a cyclic oxime of a protopane is used, or is, for example, a proline. An example of a resin film or the like formed by a combination of a ring-shaped crucible and a polyethylene. As a cyclic polyfluorene resin film, for example, there is KKK sold by JASAL (glass transition temperature is about 170 ° C, photoelastic coefficient is about 4 X 1 (Γ 13 cm 2 / dyne ), and Sekisui Chemical Co., Ltd. SCNER (glass transition temperature about 140 ° C, photoelastic coefficient is about 6 X l〇-13cm2 / dyne), and ZONR sold by OPTS (glass transition temperature about 136 ° C, photoelastic coefficient is about 6 xl ( TI3Cm2/dyne). The thickness of the transparent film is usually 20"m~Ιμπι, preferably 40~150μηι. Transparent film, the in-plane damping 値 is preferably small, such as 20iim -10· (8) 1289689 or less, it is more preferable that the thickness is not more than 10 nm, and it is more preferably 5 nm or less. - However, when the in-plane damping 値 is 20 nm, the image display quality is lowered. At the same time, the damping 値 in the thickness direction is preferably small. For example, 50 nm or less, and the right 30 nm or less, especially those below l〇nm, is preferable. When the damping in the thickness direction is more than 50 nm, the image display quality is lowered. The so-called in-plane damping 値R and the damping in the thickness direction are used.値Rt, the system will have the largest refractive index in the plane The refractive index is set to nx, and the refractive index in the direction orthogonal to the plane is ny, and the refractive index in the thickness direction is nz, and when the thickness of the film is d, the following formula (2) is used. (3) Defined 値 R = (nx-ny)xd ........(2)
Rt = [(η X + n y)/2 - ηz]Xd .........(3) 於本發明上，光彈性係數較爲小之透明薄膜之外面， 亦既與空氣接觸面，使用形成反射防止層。反射防止層乃 爲降低與空氣層之介面之反射光層，而防止起因於反射光 之散光之產生。於是，於此面之波長550nm之反射率爲 2 %以下，尤其最好係設置1 %以下之反射防止層。做爲 反射防止層，一般所使用者爲譬如，係舉出金屬，金屬氧 化物及從金屬氟化物選出之化合物所形成之單體或是多層 爲例子。做爲金屬譬如以舉出銀等爲例子，而做爲金屬氧 化物，譬如以舉出氧化矽，氧化鋁，氧化鈦，氧化鉅，氧 化釔，氧化鎬（Zr)等爲例子，同時，做爲金屬氟化物， 譬如舉出以氟化鎂等爲例子。此反射防止層，即使爲單層 亦可，或即使爲多層，譬如由2層，3層或由4層以上所 形成者亦可。反射防止層之厚度，或是反射防止層爲多層 -11 - (9) 1289689 之各層之厚度，其層數乃藉由使用於 等，來做適當選擇。同時，爲了提供反 膜之接密性，於此等之間，即使設置聚 硬著色層亦可。 於具有反射防止層之表面之接觸角 理想爲]00 °以上。於此所謂之接觸角 情況來做爲液體之値。當與空氣接觸面 80 °時，由於易於附著微粒子，故使用 學補償板之騰射型液晶顯示裝置，於長 爲易於降低對比之傾向。接觸角度之上 反射防止層之表面於滿足於此規定 直接將具有相關反射防止層之透明薄膜 是通常之反射防止層，較多情況由於無 觸角度，故於此情況時，於反射防止層 氟元素化合物所形成之層，既可達成上 氟元素化合物所形成之層，係將包含其 於表面藉由塗佈可設置。因此，用於氟 特別限定表面之接觸角度爲80 °C以上 污染一般所使用者，譬如可用於含氟元 之氟元素化合物，爲了防止於表面附著 統上一般係用於於塗佈等之領域。 於本發明上，係將具有相關反射防 於組合特定之光學補償薄膜。此光學補 膜面，塗佈液晶性化合物使其配向，當 各層之物質折射率 射防止膜與透明薄 丙醯酸著色層，或 度爲8 0 °以上，最 度，係以使用水之 之接觸角度爲未滿 具有如此表面之光 期使用時，具有成 限爲180° 。 之接觸角度時，可 使用於本發明。但 具有於此規定之接 之上面藉由設置由 述之接觸角度。由 化合物之塗佈液， 元素化合物，並非 ，爲了防止表面之 素化合物等。如此 指紋等之污染，傳 止層之透明薄膜用 償薄膜係於基材薄 組立於投射型液晶 -12- (10) 1289689 顯示裝置時，可藉由液晶單元中之液晶分子來補償所產生 之光學性相位差。 做爲光·學補償薄膜之基材薄膜，譬如有蔥架構之變性 聚碳酸脂，或從雙酚A所得之如一般之聚碳酸脂之聚碳 酸脂系樹脂，二乙醯纖維素或如二乙醯纖維素之纖維素系 樹脂，或圓波烷系單體之組合體之環狀聚油精系樹脂，或 聚亞氨基系樹脂，聚酿胺基系樹脂，polyallylate系樹脂 等。此基材薄膜之厚度，通常爲10〜ΙΟΟΟμτη程度。塗佈 於上面之液晶性化合物，譬如可於具有聚亞胺基組織之膽 固醇液晶化合物，或高分子液晶化合物等取得。配向液晶 性化合物之方法，通常之方法譬如事先配向處理基材表 面，而於此塗佈液晶性化合物，乾燥後可採用藉由熱處理 使得固定液晶性化合物之配向之方法。塗佈配向如此之液 晶性化合物之光學補償薄膜，譬如，記載於前述專利文獻 3。做爲塗佈配向液晶性化合物之販賣光學補償薄膜，譬 如舉出之例子有富士相片公司所販賣之寬視野薄膜（種 類：WVA03B，WVA12B，MVA038，WVA128)，或曰 石三菱公司所販賣之“日石LC薄膜”及“日石NH薄膜，，， “日石NR薄膜”等。 於本發明中，係將具有於以上已說明之反射反射層之 透明薄膜’和光學補償薄膜貼合於透明之玻璃基板，作成 光學補償板。通常係使用藍色板玻璃或白色板玻璃之二氧 化矽系玻璃板’或石英玻璃板等來做爲透明玻璃板。同 時’熱傳導率較爲高之藍寶石玻璃或水晶玻璃亦可適用 -13- (11) 1289689 之。藍寶石玻璃係鋁（A12 03 )之單結晶體，譬如，使用 藉由 EFG 法（edge-defined flim-fid growth 法），而形成 板狀者。而水晶玻璃爲Si02之單結晶，無論合成水晶或 天然水晶皆可。透明玻璃板之其中一面，亦既於露出面最 好具有反射防止層。透明玻璃板之厚度，通常爲〇.1〜2 mm 程度，最好爲〇.3mm以上，0.8mm以下者更佳。透明玻 璃板之面積，係藉由做爲目的之投射型液晶顯示裝置之尺 寸而適當選擇之。若顯示出代表性之尺寸例子時，具有一 邊爲10〜100mm之長方形或正方形，而直徑爲5〜100mm 之圓形或橢圓形等。 於透明玻璃板，堆積著透明薄膜及光學補償薄膜。此 時，透明薄膜能夠成爲一方之外面，通常係以透明玻璃板 /光學補償薄膜/透明薄膜之順序堆積之。透明薄膜及光學 補償薄膜之面積，通常與透明玻璃板約爲相同，或相較於 稍微較小。面積稍爲小者往往易於貼附於玻璃面，爲了從 透明玻璃板之邊緣貼附於0.5〜5 mm程度內側，故最好縮 小透明薄膜及光學補償薄膜之面積。 透明薄膜和光學補償薄膜，及玻璃板和光學薄膜，通 常係藉由黏接劑層而堆積。做爲構成黏接劑層之黏接劑， 譬如係使用鋁系列感壓型黏接劑，尿胺系列感壓型黏接劑 等之感壓型黏接劑。一般而言，感壓型黏接劑爲透明且給 予光學性等方性之黏接劑層。又，感壓型黏接劑皆被稱之 爲黏著劑。而黏接劑層之厚度通常爲1〇〜60 μπι程度。 於本發明之光學補償板之中，最好係於基材薄膜上將 -14- (12) 1289689 塗佈液晶性化合物之2片光學補償薄膜，互相相鄰而堆 積、亦既，於玻璃板之一方側面設置2片光學補償薄膜， 透明薄膜之反射防止層爲了成爲最外側，以具有反射層之 透明薄膜/第1光學補償薄膜/第2光學補償薄膜之順序配 置時，可更提高對比之改善效果。此時，2片光學補償薄 膜最好係各配向軸配置成約爲正交。同時，於此所謂之 「約爲正交」最好爲正交90°，但是即使於偏移土 5 °以 內亦可。於本說明書之其他部分中，使用於表示爲角度配 置之「約爲」亦具有相同意義。再者，2片光學薄膜之 中，接近於透明薄膜之第1光學補償薄膜，最好係於組立 於投射型液晶顯示裝置時，其配向軸係與鄰接且所配置之 偏光變換元件之直線偏光板之吸收軸約爲正交，或約爲平 行而加以配置。同時，此等2片之光學補償薄膜係與塗佈 液晶性化合物之面爲相反面，亦既，最好係相互重疊基材 薄膜而加以配置。 圖1及圖2，係表示本發明之光學補償板之例子。圖 1所示之例子，係堆積透明薄膜21和光學補償薄膜3 0， 於此光學補償薄膜30側貼合於玻璃板23而形成著光學補 償板20。於此光學補償薄膜30係於基材薄膜31塗佈配 向液晶性化合物層3 2，於液晶性化合物層3 2側貼合於透 明薄膜2 1，且於基材薄膜3 1側貼合於玻璃板23。於與透 明薄膜21之空氣接觸面上，設置著反射防層27。同時， 與往玻璃板23之光學補償薄膜30之貼合面相反側之外 面，亦設置著反射防止層28。玻璃板23於具有光學異方 •15- (13) 1289689 性時，具有使其結晶軸與透過之偏光之偏光軸平行或是正 交之必要，譬如玻璃板23若爲藍寶石時，藍寶石玻璃之 C軸與透過之偏光光之偏光軸配置成爲約爲平行，或正交 者。Rt = [(η X + ny)/2 - ηz]Xd (3) In the present invention, the outer surface of the transparent film having a small photoelastic coefficient is also in contact with the air. Use to form a reflection preventing layer. The anti-reflection layer is a layer that reduces the reflection of the interface with the air layer, and prevents the generation of astigmatism caused by the reflected light. Therefore, the reflectance at a wavelength of 550 nm on this surface is 2% or less, and it is particularly preferable to provide an antireflection layer of 1% or less. As the antireflection layer, for example, a monomer or a multilayer formed of a metal, a metal oxide, and a compound selected from a metal fluoride is exemplified. As a metal, for example, silver is used as an example, and as a metal oxide, for example, cerium oxide, aluminum oxide, titanium oxide, oxidized giant, cerium oxide, cerium oxide (Zr), etc. are taken as examples, and at the same time, For the metal fluoride, for example, magnesium fluoride or the like is exemplified. The antireflection layer may be a single layer or a plurality of layers, for example, two layers, three layers or four or more layers. The thickness of the antireflection layer or the antireflection layer is the thickness of each layer of the multilayer -11 - (9) 1289689, and the number of layers is appropriately selected by being used. At the same time, in order to provide the adhesion of the reverse film, even if a hard colored layer is provided between them. The contact angle on the surface having the antireflection layer is desirably 00 ° or more. The so-called contact angle is used as a liquid. When the contact surface with air is 80 °, since the particles are easily attached, the ejac-type liquid crystal display device using the compensation plate is prone to tend to reduce the contrast. The surface of the antireflection layer above the contact angle satisfies the requirement that the transparent film having the relevant antireflection layer is a normal antireflection layer, and in many cases, there is no contact angle, so in this case, the antireflection layer is fluorine. The layer formed by the elemental compound can achieve a layer formed by the fluorine-containing compound, and can be provided by coating it on the surface. Therefore, the contact angle for the fluorine-specific surface is 80 ° C or more, and the user can use it for fluorine-containing fluorine compounds, for example, in order to prevent surface adhesion, generally used in the field of coating, etc. . In the present invention, it will have associated reflections to prevent the combination of specific optical compensation films. The optical film surface is coated with a liquid crystal compound to be aligned, and the material refractive index of each layer is prevented from being colored with a transparent thin acrylic acid layer, or a degree of 80 ° or more, and the contact angle of the water is the highest. For use in light periods that have such a surface, the limit is 180°. The contact angle can be used in the present invention. However, the contact angle of the above is provided by setting the contact angle. The coating liquid of the compound, the elemental compound, is not, in order to prevent surface factor compounds and the like. Such a fingerprint or the like is contaminated, and the transparent film for the transfer layer is applied to the substrate thin film set in the projection type liquid crystal-12-(10) 1289689 display device, which can be compensated by the liquid crystal molecules in the liquid crystal cell. Optical phase difference. As a substrate film for optical and learning compensation films, such as denatured polycarbonate with onion structure, or polycarbonate resin such as general polycarbonate obtained from bisphenol A, diethyl phthalocyanine or two A cellulose-based resin of acetaminophen or a cyclic polyolein-based resin of a combination of round-wave-based monomers, a polyimino-based resin, a polyacrylamide-based resin, a polyallylate-based resin, or the like. The thickness of the base film is usually about 10 to τμτη. The liquid crystalline compound applied to the above can be obtained, for example, from a cholesteric liquid crystal compound having a polyimine structure or a polymer liquid crystal compound. The method of aligning the liquid crystalline compound is usually carried out by, for example, pre-aligning the surface of the substrate, and coating the liquid crystalline compound thereon, and after drying, a method of fixing the alignment of the liquid crystalline compound by heat treatment may be employed. An optical compensation film to which such a liquid crystal compound is applied is, for example, described in the aforementioned Patent Document 3. As an optical compensation film for coating a liquid crystal compound, for example, a wide-field film (type: WVA03B, WVA12B, MVA038, WVA128) sold by Fuji Photo Co., Ltd., or sold by Meteorite Mitsubishi Corporation "Nisshin LC film" and "Nippon stone NH film,", "Riishi NR film", etc. In the present invention, a transparent film having the reflective reflection layer described above and an optical compensation film are bonded to the transparent film. The glass substrate is used as an optical compensation plate. Generally, a blue glass plate or a white plate glass of a cerium oxide glass plate or a quartz glass plate is used as a transparent glass plate. At the same time, a sapphire glass having a high thermal conductivity is used. Or crystal glass can also be used for the single crystal of sapphire glass aluminum (A12 03), for example, using the EFG method (edge-defined flim-fid growth method) to form a plate The crystal glass is a single crystal of Si02, which can be either synthetic crystal or natural crystal. One side of the transparent glass plate also has a reflection preventing layer on the exposed surface. The thickness of the glass plate is usually about 11 to 2 mm, preferably 〇.3 mm or more, and 0.8 mm or less. The area of the transparent glass plate is the size of the projection type liquid crystal display device for the purpose. If a representative size example is shown, it has a rectangle or a square with a side of 10 to 100 mm and a circular or elliptical shape with a diameter of 5 to 100 mm. On the transparent glass plate, a transparent film is deposited and Optical compensation film. At this time, the transparent film can be formed on one side, usually in the order of transparent glass plate/optical compensation film/transparent film. The area of transparent film and optical compensation film is usually about the same as that of transparent glass plate. Or a slightly smaller one. The area is slightly smaller and tends to be attached to the glass surface. In order to adhere to the inner side of the transparent glass plate to the inner side of 0.5 to 5 mm, it is preferable to reduce the transparent film and the optical compensation film. The transparent film and the optical compensation film, as well as the glass plate and the optical film, are usually deposited by the adhesive layer as an adhesive for forming the adhesive layer, for example. It is a pressure-sensitive adhesive that uses aluminum series pressure-sensitive adhesives, urethane series pressure-sensitive adhesives, etc. In general, pressure-sensitive adhesives are transparent and give optical and other adhesions. The adhesive layer is also referred to as an adhesive. The thickness of the adhesive layer is usually about 1 60 60 60 μm. In the optical compensation plate of the present invention, it is preferable to On the substrate film, 14-(12) 1289689 coated two liquid-compensating films of liquid crystal compounds are stacked adjacent to each other, and two optical compensation films are disposed on one side of the glass plate, and the transparent film is reflected. In order to form the outermost layer and the transparent film/first optical compensation film/second optical compensation film having the reflective layer in the order of the outermost layer, the effect of improving the contrast can be further improved. At this time, it is preferable that the two optical compensation films are arranged so that the respective alignment axes are approximately orthogonal. Meanwhile, the so-called "about orthogonal" is preferably orthogonal to 90 degrees, but it may be within 5 degrees of the offset soil. In other parts of the specification, "about" as used in relation to the angle configuration has the same meaning. Further, among the two optical films, the first optical compensation film which is close to the transparent film is preferably linearly polarized with the alignment axis and the adjacent polarization conversion element disposed in the projection type liquid crystal display device. The absorption axes of the plates are approximately orthogonal or approximately parallel. At the same time, the two optical compensation films are opposite to the surface on which the liquid crystal compound is applied, and are preferably disposed so as to overlap the base film. 1 and 2 show an example of an optical compensation plate of the present invention. In the example shown in Fig. 1, the transparent film 21 and the optical compensation film 30 are stacked, and the optical compensation film 30 side is bonded to the glass plate 23 to form the optical compensation plate 20. In the optical compensation film 30, the liquid crystal compound layer 32 is applied to the base film 31, and the transparent film 21 is bonded to the liquid crystal compound layer 3 side, and is bonded to the glass on the side of the base film 31. Board 23. On the air contact surface with the transparent film 21, a reflection preventing layer 27 is provided. At the same time, an antireflection layer 28 is provided on the opposite side to the bonding surface of the optical compensation film 30 of the glass plate 23. The glass plate 23 has the necessity of making the crystal axis parallel or orthogonal to the polarization axis of the transmitted polarized light when the optical anisotropy is 15-15 (1) 289 689. For example, if the glass plate 23 is sapphire, the sapphire glass The C-axis and the polarization axis of the transmitted polarized light are arranged to be approximately parallel or orthogonal.
圖2所示之例子，係加上圖1之層構成，於光學補償 薄膜30與玻璃板23之間，配置第二光學補償薄膜40， 來作成光學補償板20。因此，將配置於透明薄膜2 1側之 光學補償薄膜3〇作成第一之光學補償薄膜。而第二之光 學補償薄膜40亦於基材薄膜4 1塗佈配向液晶性化合物 42。於圖2所示之例子中，2片之光學補償薄膜30，40， 其各之配向軸配置成約爲正交。此等之2片光學補償薄 膜，係與所塗佈之液晶性化合物3 2，42之面爲相反面， 亦既，基材薄膜31，41配置著相互重疊。In the example shown in Fig. 2, the layer structure of Fig. 1 is added, and a second optical compensation film 40 is disposed between the optical compensation film 30 and the glass plate 23 to form an optical compensation plate 20. Therefore, the optical compensation film 3 disposed on the side of the transparent film 2 1 is made into the first optical compensation film. The second optical compensation film 40 is also coated with the liquid crystal compound 42 on the base film 41. In the example shown in Fig. 2, the two optical compensation films 30, 40 have their respective alignment axes arranged to be approximately orthogonal. These two optical compensation films are opposite to the surface of the liquid crystal compound 3 2, 42 to be applied, and the base films 31, 41 are disposed to overlap each other.
於圖3〜圖5，係表示有關堆積2片如圖2所示之光學 補償薄膜30，4〇時，2片光學補償薄膜30，40之軸角度 之關係。於任一者之透明薄膜2 1之其中一側，爲2片光 學補償薄膜40，亦既，表示依此順序堆積第1之光學補 償薄膜30與第2光學補償薄膜4〇時之軸角度關係。即使 就任一者，第i之光學補償薄膜30之配向軸與第2光學 補償薄膜40時之配向軸配置成約爲正交。亦既，各之光 學補償薄膜30，40之長邊方向設爲〇°，於圖3中係將第 1光學補償薄膜30之配向軸設爲135°而將第2光學補償 薄膜30之配向軸設爲270 °，於圖4和圖5中，係將第1 光學補償薄膜30之配向軸設爲2 70 °而將第2光學補償薄 •16- (14) 1289689 膜30之配向軸設爲180°或0°方向。同時，圖4與圖 5，雖然表示第2光學補償薄膜40之配向軸之箭頭方向爲 相反，但是此箭頭方向係意味著爲了配向之硏磨方向。 本發明之光學補償板，係可適用於投射型液晶顯示裝 置。例如，於投射型液晶顯示裝置之中，亦可使用插入於 從白色光源之白色光的光路徑，或分光白色光之後之紅色 光，綠色光或藍色光之各原色光的光路徑中。Figs. 3 to 5 show the relationship between the axial angles of the two optical compensation films 30 and 40 when two optical compensation films 30 and 4 are stacked as shown in Fig. 2 . One of the transparent films 2 1 on either side is two optical compensation films 40, and also shows the axial relationship between the optical compensation film 30 and the second optical compensation film 4 in the same order. . Even in either case, the alignment axes of the optical compensation film 30 of the i-th and the alignment axes of the second optical compensation film 40 are arranged to be approximately orthogonal. Further, the longitudinal direction of each of the optical compensation films 30 and 40 is set to 〇°, and in FIG. 3, the alignment axis of the first optical compensation film 30 is 135° and the alignment axis of the second optical compensation film 30 is used. 270 °, in FIGS. 4 and 5, the alignment axis of the first optical compensation film 30 is set to 2 70 °, and the alignment axis of the second optical compensation thin film 16-(14) 1289689 film 30 is set. 180° or 0° direction. Meanwhile, in Fig. 4 and Fig. 5, although the direction of the arrow indicating the alignment axis of the second optical compensation film 40 is reversed, the direction of the arrow means the direction of the honing for the alignment. The optical compensation plate of the present invention is applicable to a projection type liquid crystal display device. For example, in the projection type liquid crystal display device, a light path inserted in white light from a white light source or a light path in which each of primary light of green light or blue light is split after white light is used.
具體而言，於圖6所示之投射型液晶顯示裝置之中， 係可配置於對應各三原色之液晶單元7R，7G，7B，與入 射側偏光變換元件8R，8G，8B之間，或是於射出側偏光 變換元件9R，9G，9B，與液晶單元7R，7G，7B之間， 而加以使用。而於入射側偏光變換元件8 R，8 G，8 B與液 晶單元7R，7G，7B之間，配置本發明之光學補償板具有 更有效率。此光學補償板通常所示於圖1及圖2之玻璃板 23，爲偏光變換元件8R，8G，8B或是9R，9G，9B側， 換言之，透明薄膜2 1相較於玻璃板23係配置接近於液晶 單元 7R，7G，7B。 圖7爲表示於如此之投射型液晶顯示裝置之配置例子 之剖面圖。圖7 (A )，係表示圖1所示之光學補償板2 0， 配置於液晶單元7與入射側或射出側之偏光變換元件8， 或9間之例子，同時，圖7(B)則係表示圖2所示之光學補 償板20，配置於液晶單元7與入射側或射出側之偏光變 換元件8，或9之間之例子。任一之情況，皆爲構成光學 補償板20之透明薄膜21於液晶單元7側，且玻璃板23 -17- (15) 1289689 配置於偏光變換元件8或9側。且’雖然省略圖示說明， 但是與貼附著光學補償板之光學補償薄膜30或40之面， 於相反側之玻璃板面，即使貼附偏光變換元件8或9亦 可。再者，與貼附著光學補償板之光學補償薄膜3 0或40 之面，於相反側之玻璃板面，即使直接貼附偏光板而做爲 _ 偏光變換元件亦可，於此種情況，將會減少零件數目，而 不僅具有成本效益，且易於送風，亦可改善冷卻效率。同 時，特別關於射出側之偏光變換元件，其目的係保護配置 $ 於此之偏光板，且將透過率較爲高之偏光板（滑動偏光 板），與貼附著光學補償板之光學補償薄膜3〇或40的 面，貼附於相反側之玻璃板面，於其外側，通常之偏光板 (主偏光板），係其透過軸與先前之滑動偏光板之透過軸貼 附成平行，而可作成偏光變換元件。於此種情況，於透過 率較爲高之偏光板（滑動偏光板），由於吸收具有光之程 度，故可緩和於所配置於後之主偏光板的光吸收。做爲以 如此之目的所使用之透過率較爲高之偏光板，則具有由住 鲁 友化學工業公司所販賣之“STX8C2A-HC-AR” ， ^ “STX8B2A-HC-AR，，，“STX8A2A-HC-AR-OB”。 另外’雖然亦具有以單片形式且直接放大從彩色濾光 片之分光光線，之投射型液晶顯示裝置，但是此種情況， 於白色光之光路中，於涵蓋彩色濾光片之液晶單元前或後 ，能夠配置本發明之光學補償板。 【實施例】 18· (16) 1289689 其次，顯示具體之例子，更詳細說明本發明，但是本 發明並非限定於藉由此等之例子。 實施例1 於環狀聚油精之透明樹脂薄膜，且由JAS公司所販賣 之“ARTON”（光彈性係數約爲 4 X l(r13cm2/dyne )之單 面，依此順序進行藉由反射防止處理及含氟元素矽烷化合 物所形成之處理，將此作成透明薄膜之面內阻尼値爲 4nm，厚度方向阻尼値爲46nm。與此透明薄膜之反射防 止處裡面，於相反側面，於基材薄膜爲塗佈配向液晶性化 合物之光學補償薄膜，且將2片由富士寫真相片公司所販 賣之’寬視野薄膜wva03B”藉由各黏著劑所堆積。此時，2 片光學補償薄膜配置成與圖5所示之軸角度相同，且形成 爲各液晶性化合物層之面，與相反側之基材薄膜面相互對 向貼合。更於由京瓷公司所販賣之對角尺度爲0.9吋之藍 寶石玻璃板之單面，進行反射防止處理，而於其與相反面 上，將上述之透明薄膜/第1光學補償薄膜/第2光學補償 薄膜之層積體，貼合於第2光學薄膜之液晶性化合物層 側，作成圖2所示之構造之光學補償板。此時，第2光學 補償薄膜之配向軸，和藍寶石玻璃之C軸係貼合成爲一 致。 於投射型液晶顯示裝置之紅色（R )，綠色（G )及 藍色（B )之各液晶面板，和各射出側偏光變換元件之 間，將於上面所取得之光學補償板，設定成玻璃板成爲射 -19- (17) 1289689 出側偏光板變換元件之側，而觀察後，將提高螢幕上之對 比’且暗顯示之畫面斑點亦較爲小，而改善顯示品質。 比較例1 做爲透明薄膜係於由富士寫真相片公司所販賣之三乙 醯基纖維素薄膜（光彈性係數約爲10 X l(r13Cm2/dyne ) (面內阻尼値7nm，厚度方向阻尼値56nm )之單面，除 了使用已進行反射防止處理者之外，亦製作出與實施例1 相同之光學補償板。.將此光學補償板設定成與實施例1相 同之投射型液晶顯示裝置而觀察後，螢幕上之對比雖然提 高但是亦將產生暗顯示之畫面斑點，且降低顯示品質。 〔發明之效果〕 本發明之光學補償板，係以特定之順序配置具有反射 防止層之特定透明薄膜，和光學補償薄膜者，有效使用於 投射型液晶顯示裝置，配置此光學補償板之投射型液晶顯 示裝置，將爲提高所投射之畫像對比，且，無暗顯示之畫 面斑點，成爲優於顯示品質。 【圖式簡單說明】 圖1爲表示本發明之光學補償板之例子剖面模式圖。 圖2爲表示本發明之光學補償板之其他例子剖面模式 圖。 圖3爲表示於本發明之光學補償板之中，堆積透明薄 -20- (18) 1289689 膜和2片光學補償薄膜時之軸角度之關係例子配置圖。 圖4爲表示於本發明之光學補償板之中，堆積透明薄 膜和2片光學補償薄膜時之軸角度之關係之其他例子配置 圖。 圖5爲表示於本發明之光學補償板之中，堆積透明薄 膜和2片光學補償薄膜時之軸角度之關係之另外例子配置 圖。 圖6爲槪略性表示投射型液晶顯示裝置之構造例之說 明圖。 圖7爲表示將本發明之光學補償板組合成液晶單元， 而作成投射型液晶顯示裝置時之配置例子剖面模式圖。 【符號說明】 1， 2， 3，4 …分 色 棱 鏡 5， 6··· …全 反 射 鏡 7， 7R ，7G ，7B… …液 晶 單 元 8， 8R ，8G ，8B… …入 射 側 偏 光 變 換 元 件 9， 9R ，9G ，9B"· …射 出 側 偏 光 變 換 元 件 10R， 10G， 10B… …集 光 透 鏡 L··· ···白 色 光 R·· ···紅 色 光 G·· 色 光 B·· ·.·藍 色 光 11 . …·白 色 光 源 -21 - (19) 1289689 光 光 13...........................UV， 16 ...........................投身寸 17 ...........................營幕 20 ...........................光學 21 ...........................透明 23...........................玻璃 27 ...........................設置 28 ...........................玻璃 30，40....................光學 3 1 ，4 1 32，4 2 IR防濾光片 透鏡 補償板 薄膜 板 於透明薄膜之反射防止層 板側之反射防止層 補償薄膜 補償薄膜之基材薄膜 補償薄膜之液晶性化合物層 •22-Specifically, in the projection type liquid crystal display device shown in FIG. 6, it is possible to arrange the liquid crystal cells 7R, 7G, and 7B corresponding to the respective three primary colors, and the incident side polarization conversion elements 8R, 8G, and 8B, or It is used between the output side polarization conversion elements 9R, 9G, and 9B and the liquid crystal cells 7R, 7G, and 7B. It is more efficient to arrange the optical compensation plate of the present invention between the incident side polarization conversion elements 8 R, 8 G, 8 B and the liquid crystal cells 7R, 7G, 7B. The optical compensation plate is generally shown in the glass plate 23 of FIGS. 1 and 2, and is a polarization conversion element 8R, 8G, 8B or 9R, 9G, 9B side. In other words, the transparent film 2 1 is arranged in comparison with the glass plate 23 Close to the liquid crystal cells 7R, 7G, 7B. Fig. 7 is a cross-sectional view showing an arrangement example of such a projection type liquid crystal display device. Fig. 7 (A) shows an example in which the optical compensation plate 20 shown in Fig. 1 is disposed between the liquid crystal cell 7 and the polarization conversion element 8 on the incident side or the output side, or 9, and Fig. 7(B) The optical compensation plate 20 shown in FIG. 2 is disposed between the liquid crystal cell 7 and the polarization conversion element 8 or 9 on the incident side or the output side. In either case, the transparent film 21 constituting the optical compensation plate 20 is on the liquid crystal cell 7 side, and the glass plate 23 -17-(15) 1289689 is disposed on the side of the polarization conversion element 8 or 9. Further, although not shown in the drawings, the surface of the optical compensation film 30 or 40 to which the optical compensation plate is attached may be attached to the glass plate surface on the opposite side, even if the polarization conversion element 8 or 9 is attached. Further, the surface of the optical compensation film 30 or 40 to which the optical compensation plate is attached may be a _ polarization conversion element even if a polarizing plate is directly attached to the glass plate surface on the opposite side, and in this case, It will reduce the number of parts, not only cost-effective, but also easy to supply air, and can also improve cooling efficiency. In the meantime, in particular, the polarizing conversion element on the emission side is intended to protect the polarizing plate disposed thereon, and the polarizing plate (sliding polarizing plate) having a relatively high transmittance and the optical compensation film 3 attached to the optical compensation plate. The surface of the crucible or 40 is attached to the glass plate surface on the opposite side. On the outer side of the glass plate, the polarizing plate (main polarizing plate) is generally parallel to the transmission axis of the previous sliding polarizing plate. A polarization conversion element is formed. In this case, the polarizing plate (sliding polarizing plate) having a relatively high transmittance absorbs the light having a degree of light, so that the light absorption of the rear main polarizing plate can be alleviated. As a polarizing plate with a high transmittance for such a purpose, it has "STX8C2A-HC-AR" sold by Luyou Chemical Industry Co., Ltd., ^ "STX8B2A-HC-AR,,," STX8A2A -HC-AR-OB". In addition, although there is a projection type liquid crystal display device which is a single-chip form and directly amplifies the light splitting light from the color filter, this case is covered in the light path of white light. The optical compensation plate of the present invention can be disposed before or after the liquid crystal cell of the color filter. [Embodiment] 18 (16) 1289689 Next, the present invention will be described in more detail with reference to specific examples, but the present invention is not limited to Examples of this are as follows. Example 1 A transparent resin film of a cyclic polyolein, and "ARTON" (a photoelastic coefficient of about 4 X l (r13 cm 2 /dyne )) sold by JAS Corporation, The in-plane damping 値 of the transparent film is 4 nm and the thickness direction damping 値 is 46 nm by the treatment of the reflection preventing treatment and the formation of the fluorine-containing element decane compound, and the reflection preventing portion of the transparent film is reversed. The substrate film is an optical compensation film coated with a liquid crystal compound, and two "wide-field film wva03B" sold by Fuji Photo Photo Co., Ltd. are stacked by each adhesive. At this time, two pieces of optics are stacked. The compensation film is disposed at the same angle as the axis shown in FIG. 5, and is formed on the surface of each liquid crystal compound layer, and the substrate film faces on the opposite side are opposed to each other, and are diagonally scaled by Kyocera Corporation. The single side of the 0.9 sapphire glass plate is subjected to reflection prevention treatment, and the laminate of the above transparent film/first optical compensation film/second optical compensation film is bonded to the opposite surface. 2 On the liquid crystal compound layer side of the optical film, an optical compensation plate having the structure shown in Fig. 2 is formed. At this time, the alignment axis of the second optical compensation film and the C-axis of the sapphire glass are bonded and matched. The optical compensation panel obtained by the red (R), green (G), and blue (B) liquid crystal panels of the display device and each of the emission-side polarization conversion elements is set to be a glass plate. -19- (17) 1289689 The side of the polarizing plate is changed to the side of the component, and after observation, the contrast on the screen will be improved and the speckle will be smaller, which will improve the display quality. Comparative Example 1 As a transparent film It is a single-sided cellulose film sold by Fuji Photo Photo Co., Ltd. (the photoelastic coefficient is about 10 X l (r13Cm2/dyne) (in-plane damping 値 7nm, thickness direction damping 値 56nm), except for use. An optical compensation plate similar to that of the first embodiment was produced in addition to the reflection prevention processor. The optical compensation plate was set to the same projection type liquid crystal display device as in the first embodiment, and the contrast on the screen was observed. Increased but also will produce dark spots of the screen, and reduce the display quality. [Effect of the Invention] The optical compensation plate of the present invention is configured such that a specific transparent film having an antireflection layer is disposed in a specific order, and an optical compensation film is used effectively for a projection type liquid crystal display device, and a projection type of the optical compensation plate is disposed. The liquid crystal display device is superior to the display quality in order to improve the contrast of the projected images and to have no dark spots. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing an example of an optical compensation plate of the present invention. Fig. 2 is a schematic cross-sectional view showing another example of the optical compensation plate of the present invention. Fig. 3 is a view showing an example of the relationship between the axial angles when a transparent thin -20-(18) 1289689 film and two optical compensation films are stacked in the optical compensation plate of the present invention. Fig. 4 is a view showing another example of the relationship between the axial angles when the transparent film and the two optical compensation films are stacked in the optical compensation plate of the present invention. Fig. 5 is a view showing another example of the relationship between the axial angles when the transparent film and the two optical compensation films are stacked in the optical compensation plate of the present invention. Fig. 6 is an explanatory view schematically showing a configuration example of a projection type liquid crystal display device. Fig. 7 is a cross-sectional schematic view showing an arrangement example in which an optical compensation plate of the present invention is combined into a liquid crystal cell to produce a projection type liquid crystal display device. [Description of symbols] 1, 2, 3, 4 ... dichroic prisms 5, 6 · · · · total reflection mirrors 7, 7R, 7G, 7B... liquid crystal cells 8, 8R, 8G, 8B... incident side polarization conversion elements 9, 9R , 9G , 9B " · injection side polarization conversion elements 10R, 10G, 10B... collecting lens L······ white light R····· red light G·· color light B·· .·Blue Light 11 . . . White Light Source - 21 - (19) 1289689 Light 13...........................UV, 16 ................................................................................. .......营幕20..............................Optical 21 ........... ................transparent 23...........................glass 27 ... ........................Set 28 ........................ ...glass 30,40....................Optical 3 1 ,4 1 32,4 2 IR anti-filter lens compensation plate film plate in transparent film The reflection preventing layer on the side of the reflection preventing layer compensates the substrate of the film compensation film Liquid crystalline compound layer of a thin film compensation • 22-