l33l240 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種液晶顯示器，特別是一種半穿透半反射式 液晶顯示器。 【先前技術】 由於液晶顯示器具有薄型化、低耗電量、無輻射污染、且能 與半導體製程技術相容等優點，因此被廣泛地應用在筆記型電 腦、個人數位助理、手機等攜帶式資訊產品上。 . · · . ♦ . 一般而言，依據照明光的來源可將液晶顯示器分為穿透式、 反射式、及半穿透半反射式等三種，其中穿透式液晶顯示器通常 具有一用來產生光線之背光源，並且背光源所產生之光線會通過 液晶單元以及各個光學元件(例如：偏光板）’進而讓使用者可觀看 到液晶顯示器的畫面顯示。另外，反射式液晶顯示器則是具有一 反射表面(如鋁金屬），並且當反射式液晶顯示器顯示畫面時，光線 (例如：環境光或前光源)係由面板前方進入液晶顯示器内，並通過 液晶單元以及各個光學元件，隨後反射表面再將光線反射回去， 被反射之光線會再穿過液晶皐元以及各個光學元件，最後使用者 5 1331240 便可觀看到液晶顯示器的畫面顯示。另一方面，半穿透半反射液 晶顯示器則是同時具有穿透模式及反射模式之液晶顯示器，也就 是說，當環境光強度較強或者顯示時需要較弱之光線時，液晶顯 示器便可_背光源’並湘環境光作為光源而以反^_模式來顯 示晝面，反之’當環境光強度較弱或者顯科需要較強的光線時， 液晶顯示ϋ便可開啟背統並_穿透模式來顯示畫面，如此一 來便可減少背光源的耗電量。L33l240 IX. Description of the Invention: [Technical Field] The present invention relates to a liquid crystal display, and more particularly to a transflective liquid crystal display. [Prior Art] Because liquid crystal displays have the advantages of thinness, low power consumption, no radiation pollution, and compatibility with semiconductor process technology, they are widely used in portable information such as notebook computers, personal digital assistants, and mobile phones. On the product. In general, liquid crystal displays can be classified into three types: transmissive, reflective, and transflective, depending on the source of the illumination light, and the transmissive liquid crystal display usually has one for generating The backlight of the light, and the light generated by the backlight passes through the liquid crystal unit and each optical component (for example, a polarizing plate), thereby allowing the user to view the screen display of the liquid crystal display. In addition, the reflective liquid crystal display has a reflective surface (such as aluminum metal), and when the reflective liquid crystal display displays a picture, light (for example: ambient light or front light source) enters the liquid crystal display from the front of the panel and passes through the liquid crystal. The unit and each optical component, and then the reflective surface reflects the light back, the reflected light will pass through the liquid crystal cell and the optical components, and finally the user 5 1331240 can view the liquid crystal display. On the other hand, a transflective liquid crystal display is a liquid crystal display having both a transmissive mode and a reflective mode, that is, when the ambient light intensity is strong or a weak light is required for display, the liquid crystal display can be The backlight 'Xiangxiang ambient light is used as the light source to display the surface in the reverse ^_ mode. Otherwise, when the ambient light intensity is weak or the strong light is required, the liquid crystal display can turn on the back and _ penetrate The mode is used to display the picture, which reduces the power consumption of the backlight.
模式時<丁動電話之面板大多是用來顯示時間或未接來電等訊 息’所叫常不需要太_光線’舰者便可觀看聰示晝面， 因此*’行動電話之面拓待π去丨丨田菩 ___In the mode mode, the panel of the dialing phone is mostly used to display the time or missed calls, etc. 'The caller often needs to be too _light' to watch the smart face, so *' mobile phone face extension π去丨丨田菩___
並利用穿透模式來顯示晝面。And use the penetration mode to display the face.
’台灣專利案號422934便揭露了 其結構係為上偏光板/液晶單元/ 其t當該背景光關閉時，該 一種半穿透半反射 下偏光板/半透過反 該半透過反射板係用來將 衣兄光反射回去，以使液晶顯示器利用反射模式來顯示畫 2反之，當該背景摘啟時，該㈣摘產i之光線便會穿過 <半透過反射板’以使液晶顯示器糊穿透模式來顯示晝面。然 而’由於此種類型之液晶顯示器必須額外加人—半透過反射板， 才可達到半穿辭反射之效果，如此—來，不僅會提高製作液晶 員不器的複雜度’更會增加液晶顯示^的製作成本。 【發明内容】 -因此’本發_目的之—是提供-種半穿透半反射式液 示器，以解決前述之問題。. 晶 顯 依據本發明之目的’本發明的較佳實施例係提供一種液晶顯 示器，其包含有一液晶顯示面板以及一第一偏光板，該第一偏光 板係包含有一第一面、與一面向該液晶顯示面板且相對於該第〜 面之第二面，並且該第一面係包含有複數個第一稜鏡結構。 由於本發明之下偏光板係包含有複數個稜滅結構，因此部分 的環境光可於該下偏光板之内產生反射，進而使本發明之液晶_ 示器可利用外界環境光來顯示晝面。 1331240 【實施方式】 請參考圖一與圖二’圖一係為本發明第一實施例之一液晶顯 示器的示意圖，而圖二係為圖一所示之下偏光板的放大示意圖。 如圖一所示，一液晶顯示器10包含有一液晶顯示面板12，一背光 模組14，用來提供液晶顯示面板12所需之光線，一上偏光板（即 第二偏光板）16，設置於液晶顯示面板12之上，以及一下偏光板 (即第一偏光板）18’設置於液晶顯示面板12與背光模組14之間， 並且下偏光板18係用來反射部分通過液晶顯示面板12之環境光。 其中，液晶顯示面板12係包含有一上基板24a，一下基板24b，設 置於上基板24a之下方’以及一液晶分子層26，填充於上基板24a 與下基板24b之間。另一方面，液晶顯示面板12另包含有一導電層 28a，設置於上基板24a與液晶分子層26之間，以及一導電層28b， 没置於下基板24b與液晶分子層26之間，並且導電層28a與導電層 28b係用來提供一電場給予液晶分子層26，以使液晶分子層％内的 液晶分子可依據該電場而產生相對應的偏轉，進而產生應有的光 穿透率。一般而言’上基板24a與下基板24b是由透明材料(例如： 玻璃或石英)所構成，而導電層28a與28b的材質則通常包含有氧化 銦錫或氧化銦辞等透明導電材料，而且下偏光板18係可選擇某一 特定方向之偏振光，亦即下偏光板18僅可允許某—特定方向之偏 振光通過。 8 I331240 此外，如圖一所示，背光模組14係包含有一光源3〇，用來產 生光線，一導光板32，設置於光源30之一側並係用來導引光源3〇 所產生之光線，一反射片34，設置於導光板32下方並係用來將光 線向上反射，以及一擴散膜36，設置於導光板32上方並係用來使 光線產生均勻化之效果。其中，擴散膜36的材質可以是聚碳酸酯、 聚乙烯對苯二曱酸乙酯或壓克力等，反射片34係由一具有高反射 係數之材質所形成，例如紹、銅等金屬或其合金，而光源則可 以是冷陰極管、熱陰極燈管或發光二極體等。此外，依據不同產 之需求，導光板32與下偏光板18之間還可設有一保護擴散片（未 顯示)以及一稜鏡片（未顯示），而該擴散片及該稜鏡片的數量及順 序可視需求加以增刪或調整。另一方面，液晶顯示面板丨2中還可 包含有一設置於上基板24έ之上的彩色濾光片（未顯示於圖一中）， 用來讓使用者可觀看到彩色的影像畫面。 • · . * 除此之外，如圖一所示，本發明之下偏光板18係包含有一面 向背光模組14之第-面18a、以及一面向液晶顯示面板12之第二面 18b，並且如圖二所示，下偏光板18之第一面丨仏係包含有複數個 稜鏡結構22，而且每一個稜鏡結構22係具有一平面22a與一平面 22b，用來反射部分之環境光(例如：圖一所示之環境光。普遍 而s，下偏光板18係由—偏光膜2〇1)以及兩個保護膜2〇&與2〇c所構 1331240 成’其_偏光膜20b的材質通常是聚乙歸醇(pvA)，而保護臈20a 與20c的材質大多是三醋酸纖維膜（Triacetyl cellulose ; TAC)，並 且本發明之第一實施例係利用滚輪來壓印保護膜20c，以於保護膜 • . 2〇c之表層形成圖二所示之各稜鏡結構22。 值得注意的是，如圖二所示，由於下偏光板18的折射率(大約 是1.5)係大於外界環境的折射率(大約是1〇)，因此當環境光46的折 射光線46a入射在平面22b上，且光線46a的人射角大於下偏光板18 的臨界角(critical ang】e)時’全部的光線46a都會被反射回下偏光板 18之内，而不能穿越下偏先板μ與外界環境之界面，換句話說， 當光線46a的入射角大於下偏光板18的臨界角時，光線46a會在平 面22b產生全反射。相同地，當光線46a的反射光線4邰入射於平面 22a之上，且光線46b的入射角又比下偏光板18的臨界角大時，光 線46b便會在平面22a產生全反射，而且光線46b的反射光線46(；會 離開下偏光板18並返回外界環境中。此外，如果光線46b的入射角 小於下偏光板18的臨界角時，光線46b便會穿過平面22a，並可能 在相鄰之稜鏡結構22内產生反射，而返回外界環境中。值得一提 的疋，本發明乃是依據以上所述之特性，並經由調整平面與平 面22b之夾角Θ1，以將特定角度之環境光反射至液晶顯示器的可視 角度(viewing angle)範圍内.。舉例來說，假若產品所需之水平可視 角度以及*直可視角度分別為10〇度以及4〇度，本發明便可經由調 10 1331240 整平面22a與平面22b之夾_，以將部分的壞境光反射至前迷之 可視角度範圍内。換言之，本㈣之下偏光板财僅可用來反射 部分之環境光，以使液晶顯示㈣藉由環境絲顯示晝面，本發 明更可經㈣整平®22a與平面22b之失觸，⑽環境光反射至 液晶顯示器10的可視角度範圍内。 、 此外，由於下偏光板18對環境光的反射效果係與各稜鏡結構 22之平面22a與平面22b的夾爲Θ1(亦即：稜鏡角度)有關，因此本發 明係針對不同之稜鏡角度進行光學模擬，其結果係如圖三所示。 其中，如圖二所示，在下偏光板18的光反射模擬過程十，光源係 將120範圍内的光線自下偏光板18之第二面i8b入射至下偏光板 18之内，然後再計算光線在下偏光板ι8之内產生反射的比例，以 得到圖三所示之光線反射的比例(亦即：符號”□”所示之數據）。另 一方面，在下偏光板18的光穿透模擬過程_，光源係將70。範圍内 的光線自下偏光板18之第一面18a入射至下偏光板18之内，隨後再 計算光線穿透下偏光板18的比例，以得到圖三所示之光線穿透的 比例(亦即：符號"”所示之數據）。必須注意的是，如圖三所示， 當平面22a與平面22b之夾角Θ1介於70度與120度之間時，光線在下 偏光板18之内具有較佳的反射效果。 請再繼續參考圖一，接下來將解释本發明之液晶顯示器10的 1331240 顯示方法。如圖一所示，當背光模紐】4開啟時，光源％所產生之 光線40係先經過導光板32，然後再依序地穿過擴散膜％、下偏光 板18、液晶顯示面板12以及上偏光板〗6 ,最後，使用者幻便可觀 看到液晶顯示H1G的影像晝面。另方面，當背光模組14關閉時， 外界的環境光财依序通耻偏歧16触晶顯示峨12，隨後 部分的環境光38會在下偏光板18内產生反射，並且被反射之環境 光38會再依序穿過液晶顯示面板12以及上偏光板16，最後，使用 者42便可看到液晶顯示器1〇的影像晝面。此外，前述之環境光％ 與光線40的行進路徑僅是用來解釋本發明之液晶顯示器〗〇之顯示 模式’並非實際之光線行進路徑。 ···'·. · 值得一提的是，由於本發明之下偏板18具有複數個稜鏡結構 22，因此可增加環境光在下偏板18内產生反射的比例進而可使 液晶顯示器10利用環境光來顯示畫面，換言之，本發明不需額外 加入一半穿透半反射膜，便可達到半穿透半反射的效果，因此本 發明不僅可降低製作液晶顯示器的複雜度，更可減少液晶顯示器 的製作成本。此外，如圖一所示，由於環境光38在下偏光板18内 產生反射，所以環境光38係依序經過上偏光板16、下偏光板18以 及上偏光板16，而由於環境光38通過2片偏光板，所以液晶顯示器 10的對比比較好’因此本發明係可提升液晶顯示器1〇的對比效果。 12 1331240 另一方面’圖二所示之下偏光板18並非本發明之唯一結構， 以下將介紹本發明之其它實施例之下偏光板結構。請參考圖四， 圖四係為本發明第二實施例之下偏光板的示意圖，其中相鄰兩棱 鏡結構22之間係可包含有一平面22c。此外，請參考圖五，圖五係 為本發明第三實施例之下偏光板的示意圖，其+未發明之第三實 施例係利用網印或貼附等方法，而將各稜鏡結構22形成於保護膜 20c之表面，並且各稜鏡結構22通常是由硬化樹脂構成。另外，請 參考圖六’圖六係為本發明第四實施例之下偏光板的示意圖，其 中下偏光板18另包含有一薄膜層2〇d，並且各稜鏡結構22係形成於 薄膜層20d之表層，另外，薄膜層2〇d係經由一擴散膠21而貼附於 保護膜20c之表面，並且擴散膠21係用來霧化光線並係由pSA (Pressure Sensitive Adhesives)感壓性黏著劑所構成，而薄膜 層20d的材質係包含有硬化樹脂。請參考圖七，圖七係為本發明第 五實施例之下偏光板的示意圖，其中下偏光板18另包含有一薄膜 層20d，並且本發明之第五實施例係利用網印或貼附等方法，而將 各棱鏡結構22形成於薄膜層2〇d之表面’另外，薄膜層2〇d係經由 一擴散膠21而貼附於保護膜2〇c之表面，並且擴散膠21係用來霧化 光線並係由PSA感壓性黏者劑所構成，而薄膜層2〇d與各稜鏡結構 22的材質係包含有硬化樹脂。請參相人，圖人係為本發明第六 實加例之下偏光板的示思圖，其中下偏光板18之第二面I%亦包含 有複數個稜鏡結構25，各稜鏡結構25係形成於保護膜2如之表層， 13 1331240 而且母個稜鏡結構25係真有一平面253與一平面25b，並且在本 發明之第五實施例中，平面25a與平面25b之夾角θ2係介於7〇。與 120之間’而且各稜鏡結構乃之製作方法可以是圖四至圖七所示 之任何一種。 除此之外’請參考圖九，圖九係為本發明第二實施例之一液 * * . - 晶顯不器的示意圖。如圖八所示，一液晶顯示器5❶包含有一液晶 鲁 顯不面板52以及一用來產生光線之背光模組54。其中，液晶顯示 面板52係包含有一上基板6〇a，一下基板6%，設置於上基板之 下方’ 一液晶分子層62 ’填充於上基板6〇a與下基板6〇b之間，一 導電層64a，設置於上基板6〇a與液晶分子層62之間，以及一導電 層64b，設置於下基板6%與液晶分子層62之間。此外，背光模組 54係包含有一光源66、一導光板砧、一反射片7〇以及一擴散膜。 如圖九所示，液晶顯示器5〇另包含有一上偏光板56，設置於 液晶顯示面板52之上並係允許某一特定方向之偏振光通過，以及 一下偏光板58 ’設置於液晶顯示面板52與背光模組54之間並係允 許某一特定方向之偏振光通過。其中，下偏光板58係包含有一具 有複數個稜鏡結構59之第一面58a、以及一相對於第一面58a之第 二面58b，而且下偏光板58之功能係與圖一所示之下偏光板以相 同’亦即部分通過液晶顯示面板52之環境光會在下偏光板58内產 14 1331240 反射另方面’下偏光板58之結構並不限於圖九所示，下偏 光板58之結構還可以是圖四至圖八其申一種。 此外’如圖九所示’上偏光板56係包含有一第一面56a與一第 一面56b，其中第二面56b係包含有複數個稜鏡結構74，各稜鏡結 構74均係具有一平面74a與一平面74b，並且平面7如與平面之 夾角係介於70。與120。之間。值得注意的是，上偏光板56係用來增 加入光量’進而可增加環境光在下偏光板58内的反射比例。 值得注意的是，前述之棱鏡結構22、25、59與74均係為一對 稱性結構，然而本發明並不限於此，上述之各稜鏡結構亦可以是 一非對稱性結構。此外，上述之背光模組14與54均係為一側光式 背光模組，不過本發明也並不囿限於此，直下式背光模組亦可適 用於本發明之液晶顯示器。 相較於習知技術，本發明之液晶顯示器10(或5〇)係包含有一下 偏光板18(或58)，並且下偏光板10(或50)係包含有複數個面對背光 模级14(或54)之棱鏡結構22(或59)，因此部分的環境光會在下偏光 板18(或58)之内產生反射，進而使該液晶顯示器1〇(或5〇)可利用外 界環境光來顯示畫面。換言之，本發明之液晶顯示器無須額外加 入一半透過反射板，便可達到半穿透半反射之效果，因此本發明 15 係可降低製作液晶顯示器的複雜度，進而可減少液晶顯示器的製 成本此外纟於本發明之環境光通過偏光板的次數增加，因 此本發明係可提歧晶顯示H的對比效果。 以上所述僅為本發明之較佳實施例，凡依本發明申請專利範 園所做之均轉化絲飾’皆應屬本發料狀涵蓋範圍。 圖式之簡單說明 圖一係為本發明第一實施例之一液晶顯示器的示意圖。 圖二係為圖一所示之下偏光板的放大示意圖。 圖三係為本發明之各種棱鏡角度的光學模擬結果。 圖四係為本發明第二實施例之下偏光板的示意圖。 圖五係為本發明第三實施例之下偏光板的示意圖。 圖六係為本發明第四實施例之下偏光板的示意圖。 圖七係為本發明第五實施例之下偏光板的示意圖。 圖八係為本發明第六實施例之下偏光板的示意圖 圖九係為本發明第二實施例之一液晶顯示器的示意圖。 圖式之符號說明 1331240 10 液晶顯不 12 液晶顯不面板 14 背光模組 16 上偏光板 18 下偏光板 18a 第一面 18b 第二面 20a 保護膜 20b 偏光膜 20c 保護膜 20d 薄膜層 22 棱鏡結構 22a 平面 22b 平面 22c 平面 24a 上基板 24b 下基板 25 稜鏡結構 25a 平面 25b 平面 26 液晶分子層 28a 導電層 28b 導電層 30 光源 32 導光板 34 反射片 36 擴散膜 38 環境光 40 光線 42 使用者 46 環境光 46a 光線 46b 光線 46c 光線 50 液晶顯示器 52 .. 液晶顯不面板 54 背光模組 56 上偏光板 56a 第一面 56b 第二面 58 下偏光板 58a 第一面 1331240 58b 第二面 60a 上基板 60b 下基板 62 液晶分子層 64a 導電層 64b 導電層. 66 光源 68 導光板 70 反射片 72 擴散膜 74 稜鏡結構 74a 平面 74b 平面'Taiwan Patent No. 422,934 discloses that the structure is an upper polarizer/liquid crystal cell/when the background light is off, the transflective lower polarizer/semi-transmissive semi-transmissive reflector is used. To reflect the light of the brothers back, so that the liquid crystal display uses the reflection mode to display the picture 2, and vice versa, when the background is picked up, the light of the (i) extraction i will pass through the <semi-transmissive reflector' to make the liquid crystal display Paste penetration mode to display the face. However, because this type of liquid crystal display must add extra people - semi-transmissive reflectors, the effect of semi-transparent reflection can be achieved, so that it will not only improve the complexity of making LCD players, but also increase the liquid crystal display. ^ The cost of production. SUMMARY OF THE INVENTION - Therefore, the present invention is to provide a transflective liquid display to solve the aforementioned problems. According to a preferred embodiment of the present invention, a liquid crystal display includes a liquid crystal display panel and a first polarizing plate, the first polarizing plate including a first surface and a surface. The liquid crystal display panel is opposite to the second surface of the first surface, and the first surface includes a plurality of first 稜鏡 structures. Since the polarizing plate of the present invention comprises a plurality of ribbed structures, part of the ambient light can be reflected within the lower polarizing plate, so that the liquid crystal display of the present invention can display the kneading surface by using ambient light. . [FIG. 1] Referring to FIG. 1 and FIG. 2, FIG. 1 is a schematic diagram of a liquid crystal display according to a first embodiment of the present invention, and FIG. 2 is an enlarged schematic view of the polarizing plate shown in FIG. As shown in FIG. 1 , a liquid crystal display 10 includes a liquid crystal display panel 12 , a backlight module 14 for providing light required by the liquid crystal display panel 12 , and an upper polarizing plate (ie, a second polarizing plate) 16 disposed on the liquid crystal display 10 . The liquid crystal display panel 12 and the lower polarizing plate (ie, the first polarizing plate) 18' are disposed between the liquid crystal display panel 12 and the backlight module 14, and the lower polarizing plate 18 is used for reflecting the portion through the liquid crystal display panel 12. Ambient light. The liquid crystal display panel 12 includes an upper substrate 24a, a lower substrate 24b disposed under the upper substrate 24a, and a liquid crystal molecular layer 26 filled between the upper substrate 24a and the lower substrate 24b. On the other hand, the liquid crystal display panel 12 further includes a conductive layer 28a disposed between the upper substrate 24a and the liquid crystal molecular layer 26, and a conductive layer 28b not disposed between the lower substrate 24b and the liquid crystal molecular layer 26, and is electrically conductive. The layer 28a and the conductive layer 28b are used to provide an electric field to the liquid crystal molecular layer 26 so that liquid crystal molecules in the liquid crystal molecular layer % can generate corresponding deflection according to the electric field, thereby generating the desired light transmittance. Generally, the upper substrate 24a and the lower substrate 24b are made of a transparent material (for example, glass or quartz), and the materials of the conductive layers 28a and 28b usually include a transparent conductive material such as indium tin oxide or indium oxide. The lower polarizing plate 18 can select polarized light of a specific direction, that is, the lower polarizing plate 18 can only allow a certain direction of polarized light to pass. 8 I331240 In addition, as shown in FIG. 1 , the backlight module 14 includes a light source 3 〇 for generating light, and a light guide plate 32 is disposed on one side of the light source 30 and is used to guide the light source 3 产生. The light, a reflection sheet 34, is disposed under the light guide plate 32 and is used to reflect the light upward, and a diffusion film 36 is disposed above the light guide plate 32 and used to homogenize the light. The material of the diffusion film 36 may be polycarbonate, polyethylene terephthalate or acrylic, and the reflection sheet 34 is formed of a material having a high reflection coefficient, such as a metal such as shovel or copper. The alloy, and the light source may be a cold cathode tube, a hot cathode tube or a light emitting diode. In addition, depending on the requirements of different products, a protective diffusion sheet (not shown) and a cymbal sheet (not shown) may be disposed between the light guide plate 32 and the lower polarizing plate 18, and the number and sequence of the diffusion sheet and the cymbal sheet. Add, delete or adjust as needed. On the other hand, the liquid crystal display panel 丨2 may further include a color filter (not shown in FIG. 1) disposed on the upper substrate 24A for allowing the user to view the color image. In addition, as shown in FIG. 1, the polarizing plate 18 of the present invention includes a first surface 18a facing the backlight module 14, and a second surface 18b facing the liquid crystal display panel 12, and As shown in FIG. 2, the first surface of the lower polarizing plate 18 includes a plurality of dam structures 22, and each of the cymbal structures 22 has a flat surface 22a and a flat surface 22b for reflecting part of the ambient light. (For example: ambient light shown in Figure 1. Generally, s, lower polarizer 18 is made up of - polarizing film 2〇1) and two protective films 2〇& and 2〇c are constructed as 1331240. The material of 20b is usually polyethyl alcohol (pvA), and the materials of the protective crucibles 20a and 20c are mostly triacetyl cellulose (TAC), and the first embodiment of the present invention uses a roller to imprint a protective film. 20c, for the surface of the protective film • 2〇c to form the respective structures 22 shown in FIG. It should be noted that, as shown in FIG. 2, since the refractive index of the lower polarizing plate 18 (about 1.5) is greater than the refractive index of the external environment (about 1 〇), when the refracted ray 46a of the ambient light 46 is incident on the plane. 22b, and when the angle of incidence of the light 46a is greater than the critical angle of the lower polarizer 18 (critical ang) e), all of the light 46a will be reflected back into the lower polarizer 18, and cannot pass through the lower deflecting plate μ and The interface of the external environment, in other words, when the incident angle of the light 46a is greater than the critical angle of the lower polarizer 18, the light 46a will be totally reflected at the plane 22b. Similarly, when the reflected light ray 4 of the light 46a is incident on the plane 22a, and the incident angle of the light 46b is larger than the critical angle of the lower polarizer 18, the light 46b will be totally reflected on the plane 22a, and the light 46b The reflected light 46 (will leave the lower polarizer 18 and return to the external environment. Further, if the incident angle of the light 46b is smaller than the critical angle of the lower polarizer 18, the light 46b will pass through the plane 22a and may be adjacent The reflection in the structure 22 is returned to the external environment. It is worth mentioning that the present invention is based on the above-mentioned characteristics and adjusts the angle Θ1 between the plane and the plane 22b to adjust the ambient light at a specific angle. Reflected to the viewing angle of the liquid crystal display. For example, if the horizontal viewing angle and *straight viewing angle required by the product are 10 degrees and 4 degrees, respectively, the present invention can be adjusted by 10 1331240 The entire plane 22a and the plane 22b are sandwiched _ to reflect part of the ambient light to the visible angle range of the former. In other words, the polarizing plate under (4) can only be used to reflect part of the ambient light, Liquid crystal display (4) The surface of the liquid crystal display 10 can be reflected by the ambient light, and the ambient light can be reflected to the visible angle range of the liquid crystal display 10. Further, due to the lower polarizing plate 18 The reflection effect on the ambient light is related to the sandwich of the plane 22a and the plane 22b of each of the raft structures 22 being Θ1 (that is, the 稜鏡 angle), so the present invention performs optical simulation for different 稜鏡 angles, and the result is As shown in FIG. 3, as shown in FIG. 2, in the light reflection simulation process of the lower polarizing plate 18, the light source injects light in the range of 120 from the second surface i8b of the lower polarizing plate 18 to the lower polarizing plate 18. Then, the ratio of the reflection of the light within the lower polarizing plate ι8 is calculated, to obtain the ratio of the light reflection shown in FIG. 3 (ie, the data indicated by the symbol "□"). On the other hand, the lower polarizing plate 18 The light penetrates the simulation process _, the light source is 70. The light in the range is incident from the first face 18a of the lower polarizer 18 into the lower polarizer 18, and then the proportion of the light penetrating the lower polarizer 18 is calculated. Get the light shown in Figure 3. Permeable ratio (ie, the data shown in the symbol "". It must be noted that, as shown in Figure 3, when the angle 平面1 between the plane 22a and the plane 22b is between 70 and 120 degrees, the light is below There is a better reflection effect in the polarizing plate 18. Referring to Figure 1, the following will explain the display method of the 1331240 of the liquid crystal display 10 of the present invention. As shown in Figure 1, when the backlight module 4 is turned on, the light source The light 40 generated by % passes through the light guide plate 32 first, and then sequentially passes through the diffusion film %, the lower polarizing plate 18, the liquid crystal display panel 12, and the upper polarizing plate 〖6. Finally, the user can view the liquid crystal. The image of H1G is displayed. On the other hand, when the backlight module 14 is turned off, the external environment light is sequentially exposed to the crystal 16 to the crystal display ,12, and then part of the ambient light 38 is reflected in the lower polarizing plate 18, and the reflected ambient light is reflected. 38 will then pass through the liquid crystal display panel 12 and the upper polarizing plate 16 in sequence, and finally, the user 42 can see the image plane of the liquid crystal display. Further, the aforementioned ambient light % and the traveling path of the light ray 40 are merely used to explain that the display mode of the liquid crystal display of the present invention is not an actual light traveling path. It is worth mentioning that, since the polarizing plate 18 of the present invention has a plurality of dam structures 22, the proportion of ambient light generated in the lower polarizing plate 18 can be increased, and the liquid crystal display 10 can be utilized. Ambient light to display the picture, in other words, the invention can achieve the effect of semi-transparent and semi-reflection without adding half of the transflective film, so the invention can not only reduce the complexity of manufacturing the liquid crystal display, but also reduce the liquid crystal display. Production costs. In addition, as shown in FIG. 1, since the ambient light 38 is reflected in the lower polarizing plate 18, the ambient light 38 sequentially passes through the upper polarizing plate 16, the lower polarizing plate 18, and the upper polarizing plate 16, and the ambient light 38 passes through 2 The polarizing plate is used, so the contrast of the liquid crystal display 10 is relatively good. Therefore, the present invention can improve the contrast effect of the liquid crystal display. 12 1331240 On the other hand, the polarizing plate 18 shown in Fig. 2 is not the only structure of the present invention, and the polarizing plate structure of the other embodiments of the present invention will be described below. Referring to FIG. 4, FIG. 4 is a schematic diagram of a polarizing plate according to a second embodiment of the present invention, wherein a plane 22c may be included between adjacent prism structures 22. In addition, referring to FIG. 5, FIG. 5 is a schematic diagram of a polarizing plate according to a third embodiment of the present invention, and the third embodiment of the invention is a method of screen printing or attaching, and the respective structures 22 are used. It is formed on the surface of the protective film 20c, and each of the ruthenium structures 22 is usually composed of a hardened resin. 6 is a schematic view of a polarizing plate according to a fourth embodiment of the present invention, wherein the lower polarizing plate 18 further includes a film layer 2〇d, and each of the germanium structures 22 is formed on the film layer 20d. In addition, the film layer 2〇d is attached to the surface of the protective film 20c via a diffusion adhesive 21, and the diffusion adhesive 21 is used for atomizing light and is a pressure sensitive adhesive of pSA (Pressure Sensitive Adhesives). The material of the film layer 20d is composed of a cured resin. Referring to FIG. 7, FIG. 7 is a schematic diagram of a polarizing plate according to a fifth embodiment of the present invention, wherein the lower polarizing plate 18 further includes a film layer 20d, and the fifth embodiment of the present invention utilizes screen printing or attaching, etc. In the method, each prism structure 22 is formed on the surface of the film layer 2〇d. In addition, the film layer 2〇d is attached to the surface of the protective film 2〇c via a diffusion adhesive 21, and the diffusion adhesive 21 is used. The atomized light is composed of a PSA pressure-sensitive adhesive, and the film layer 2〇d and the material of each of the tantalum structures 22 contain a hardened resin. Please refer to the person, the figure is the illustration of the polarizing plate under the sixth embodiment of the present invention, wherein the second surface I% of the lower polarizing plate 18 also includes a plurality of 稜鏡 structures 25, each 稜鏡 structure 25 is formed on the surface of the protective film 2, 13 1331240, and the mother 稜鏡 structure 25 has a plane 253 and a plane 25b, and in the fifth embodiment of the present invention, the angle θ2 between the plane 25a and the plane 25b is Between 7 〇. And the structure of each of the structures may be any one of the figures shown in Figs. 4 to 7. In addition, please refer to FIG. 9 , which is a schematic diagram of a liquid * * - crystal display device according to a second embodiment of the present invention. As shown in FIG. 8, a liquid crystal display 5A includes a liquid crystal display panel 52 and a backlight module 54 for generating light. The liquid crystal display panel 52 includes an upper substrate 6〇a, and the lower substrate 6% is disposed under the upper substrate. A liquid crystal molecular layer 62′ is filled between the upper substrate 6〇a and the lower substrate 6〇b. The conductive layer 64a is disposed between the upper substrate 6a and the liquid crystal molecule layer 62, and a conductive layer 64b is disposed between the lower substrate 6% and the liquid crystal molecule layer 62. In addition, the backlight module 54 includes a light source 66, a light guide anvil, a reflective sheet 7〇, and a diffusion film. As shown in FIG. 9, the liquid crystal display 5 further includes an upper polarizing plate 56 disposed on the liquid crystal display panel 52 to allow polarized light of a specific direction to pass, and the lower polarizing plate 58' is disposed on the liquid crystal display panel 52. The backlight module 54 is allowed to pass through a polarized light in a specific direction. The lower polarizing plate 58 includes a first surface 58a having a plurality of dam structures 59 and a second surface 58b opposite to the first surface 58a, and the function of the lower polarizing plate 58 is as shown in FIG. The lower polarizer has the same 'that is, the ambient light partially passing through the liquid crystal display panel 52 is produced in the lower polarizer 58. 14 1331240 is reflected. The structure of the lower polarizing plate 58 is not limited to that shown in FIG. 9, and the structure of the lower polarizing plate 58 is shown. It can also be a form of Figure 4 to Figure 8. In addition, the upper polarizing plate 56 includes a first surface 56a and a first surface 56b, wherein the second surface 56b includes a plurality of dam structures 74, each of which has a The plane 74a is aligned with a plane 74b, and the plane 7 is at an angle of 70 to the plane. With 120. between. It is to be noted that the upper polarizing plate 56 is used to increase the amount of light' to increase the reflection ratio of the ambient light in the lower polarizing plate 58. It should be noted that the foregoing prism structures 22, 25, 59 and 74 are all symmetrical structures, but the present invention is not limited thereto, and the above-mentioned respective 稜鏡 structures may also be an asymmetrical structure. In addition, the backlight modules 14 and 54 are both one-side optical backlight modules. However, the present invention is not limited thereto, and the direct-lit backlight module can also be applied to the liquid crystal display of the present invention. Compared with the prior art, the liquid crystal display 10 (or 5) of the present invention includes a lower polarizing plate 18 (or 58), and the lower polarizing plate 10 (or 50) includes a plurality of facing backlighting stages 14 (or 54) prism structure 22 (or 59), so that part of the ambient light will reflect within the lower polarizer 18 (or 58), thereby allowing the liquid crystal display 1 (or 5 〇) to utilize ambient light Display the screen. In other words, the liquid crystal display of the present invention can achieve the effect of semi-transparent and semi-reflection without additionally adding half of the transflective plate. Therefore, the 15 series of the present invention can reduce the complexity of manufacturing the liquid crystal display, thereby reducing the fabrication cost of the liquid crystal display. The number of times the ambient light of the present invention passes through the polarizing plate is increased, so that the present invention can provide a contrast effect of the dissimilar crystal display H. The above description is only a preferred embodiment of the present invention, and all of the converted silk ornaments made in accordance with the patent application of the present invention should fall within the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a liquid crystal display according to a first embodiment of the present invention. Figure 2 is an enlarged schematic view of the polarizing plate shown in Figure 1. Figure 3 is an optical simulation of the various prism angles of the present invention. Figure 4 is a schematic view of a polarizing plate according to a second embodiment of the present invention. Figure 5 is a schematic view of a polarizing plate of a third embodiment of the present invention. Fig. 6 is a schematic view showing a polarizing plate of a fourth embodiment of the present invention. Figure 7 is a schematic view showing a polarizing plate of a fifth embodiment of the present invention. Figure 8 is a schematic view showing a polarizing plate according to a sixth embodiment of the present invention. Figure 9 is a schematic view showing a liquid crystal display according to a second embodiment of the present invention. Symbol description of the figure 1331240 10 Liquid crystal display 12 Liquid crystal display panel 14 Backlight module 16 Upper polarizing plate 18 Lower polarizing plate 18a First surface 18b Second surface 20a Protective film 20b Polarizing film 20c Protective film 20d Film layer 22 Prism structure 22a plane 22b plane 22c plane 24a upper substrate 24b lower substrate 25 稜鏡 structure 25a plane 25b plane 26 liquid crystal molecular layer 28a conductive layer 28b conductive layer 30 light source 32 light guide plate 34 reflection sheet 36 diffusion film 38 ambient light 40 light 42 user 46 Ambient light 46a Light 46b Light 46c Light 50 Liquid crystal display 52 .. Liquid crystal display panel 54 Backlight module 56 Upper polarizing plate 56a First surface 56b Second surface 58 Lower polarizing plate 58a First surface 1331240 58b Second surface 60a Upper substrate 60b lower substrate 62 liquid crystal molecular layer 64a conductive layer 64b conductive layer. 66 light source 68 light guide plate 70 reflective sheet 72 diffusion film 74 稜鏡 structure 74a plane 74b plane