200817792 九、發明說明 【發明所屬之技術領域】 本發明係關於背光裝置、顯示裝置及光學構件，更詳 細而言’係關於以液晶顯示器爲代表之顯示裝置所使用的 背光裝置、具備背光裝置之顯示裝置及背光裝置所使用的 光學構件。 【先前技術】 以液晶顯示器爲代表之顯示裝置，被要求高正面亮度 。因此，於構成顯示裝置的背光裝置設置有用以提升正面 亮度的光學構件。如專利第3 26223 0號（專利文獻1 )所 揭示般’一般而言，光學構件係使用稜鏡薄板。 近年來，被要求進一步的正面亮度提升，具備種種之 光學構件的背光裝置被提出。日本專利特開2〇〇4-3丨1263 號公報（專利文獻2 )係如第1 4圖所示般，爲揭示具備 有微透鏡陣列薄板100與稜鏡薄板200之背光裝置用的光 學構件。以下，將此光學構件稱爲先行光學構件3 00。在 專利文獻2中，係藉由將稜鏡薄板2 0 0重疊於微透鏡陣列 薄板1 00上，得以獲得更高的聚光效果，其結果可以格外 地提升正面亮度。 但是，依據本申請案發明者等之調查結果，得知先行 光學構件3 00具有以下3種問題。 第1:在先行光學構件300中，產生幅度窄的亮度角 度分佈。在以稜鏡薄板上之複數個稜鏡201的並設方向成 -5- 200817792 爲顯示裝置的顯示畫面之上下方向的方式來設置先行光學 構件300之情形時，上下方向的亮度角度分佈之寬度變得 非常地狹窄。即上下方向的視野角度（以下，稱爲上下視 野角度）變窄。第15圖係藉由本申請案發明者等所獲得 之先行光學構件3 00的上下方向及左右方向的亮度角度分 佈。圖中的橫軸係表示視野角度。視野角度係以光學構件 的法線方向（即正面）爲Odeg，針對上下方向，將從 0 d e g朝上方向之傾斜角當成正（+ )、朝下方向的傾斜 角當成負（-)。同樣地，針對左右方向，將從〇 d e g朝右 方向之傾斜角當成正（+ )、朝左方向的傾斜角當成負 (-)。圖中的縱軸係表示亮度。此處所謂的亮度，係不 設置光學構件，以只將擴散板設置於開口部之背光裝置的 正面亮度（視野角度Odeg的亮度）當成基準（1 .〇 )之相 對亮度（單位爲a. u.)。 參照第1 5圖，顯示畫面的正面亮度，即視野角度 Odeg中之亮度約爲2.3 a· II·，係比棱鏡薄板1片的正面亮 度（1.55a.u.)還高。但是，上下方向的亮度角度分佈（ 圖中實線）的寬度變窄。具體而言，亮度成爲正面亮度的 1 /2以上之視野角度範圍（以下，稱爲1 /2視野角度範圍 )，係比±35deg的範圍窄，爲-30〜+30deg之範圍。上下 方向及左右方向之亮度角度分佈，係以具有某種程度的寬 度者爲佳。此係顯示裝置的使用者也時會從上下斜方向壞 左右斜方向來看顯示畫面。因此，2軸方向（上下方向及 左右方向）的任何其中一種的亮度角度分佈，也以具有某 -6 - 200817792 種程度的寬度者爲佳。具體而言，在2軸方向的亮度角度 分佈中，以1/2視野角度範圍比±3 5 deg之範圍更大者爲隹 〇 第2 :在先行光學構件3 00所獲得之左右方向的亮度 角度分佈（圖中點線），如不成爲以正面亮度爲峰値’隨 著視野角度的擴展亮度逐漸降低之自然的分佈’視野角度 比P1 (約- 50deg)及P2(約+ 50deg)還大時，売度極端 地降低。此種亮度角度分佈之斜度的極端變化，會對觀看 顯示畫面的使用者造成不調和感。 第3 :於先行光學構件3 00所獲得之上下方向的亮度 ，雖隨著視野角度變大而逐漸降低，但是一超過±50deg 時再度上昇。即上下方向之亮度角度分佈具有側耳S1及 S2。此種側耳S1及S2也對觀看顯示畫面的使用者造成不 調和感。 [專利文獻1]專利第326223 0號公報 [專利文獻2]日本專利特開2004-3 1 1 263號公報 【發明內容】 [發明所欲解決之課題] 本發明之目的在於提供：具有高正面亮度，且2軸方 向的亮度角度分佈具有某種程度的寬幅之背光裝置。更具 體而言，在於提供：正面亮度比稜鏡薄板1片的背光裝置 的正面亮度高，且在2軸方向的亮度角度分佈之各分佈中 ，1/2視野角度範圍比±35deg的範圍更大之背光裝置。 200817792 本發明之其他目的在於提供： 定向分佈之背光裝置。更具體而1 亮度角度分佈曲線的斜度之極端變 發生的背光裝置。 [解決課題之手段及發明的效果] 依據本發明之背光裝置，係具 陣列薄板；及凸鏡狀透鏡薄板。 微透鏡陣列薄板係具有：面對 面相反側，且形成有複數微透鏡的 薄板係具有：面對微透鏡面的平面 形成有相互並設的複數圓筒透鏡的 依據本發明之背光裝置，係於 凸鏡狀透鏡薄板。被以微透鏡陣列 鏡狀透鏡薄板所聚光，所以正面亮 的背光裝置的正面亮度還高。進而 設置凸鏡狀透鏡薄板之情形時，可 方向之亮度角度分佈變得極端地窄 筒透鏡的長邊方向及並設方向）的 者之1/2視野角度範圍都比±35deg 向中之一方，其1/2視野角度範圍 佳。進而，可以降低側耳，且能夠 度之極端的變化。 以微透鏡陣列薄板及凸鏡狀透 亮度角度分佈成爲自然 ，在於提供：可以抑制 化，且能夠抑制側耳之 備：面光源；及微透鏡 面光源的平面，及爲平 微透鏡面。凸鏡狀透鏡 ;及爲平面相反側，且 圓筒透鏡面。 微透鏡陣列薄板上設置 所聚光的光進一步被凸 度變得比稜鏡薄板1片 ，於微透鏡陣列薄板上 以抑制圓筒透鏡的並設 。因此，2軸方向（圓 亮度角度分佈，任何一 的範圍還大。以2軸方 比±50deg的範圍還大爲 抑制亮度角度分佈的斜 鏡薄板爲長方形爲佳， -8- 200817792 複數個圓筒透鏡係被並設於凸鏡狀透鏡薄板 在此情形時，圓筒透鏡的並設方向之聚 長邊方向的聚光效果大。因此，長邊方向的 係比短邊方向的亮度角度分佈還寬。 通常，顯示裝置的顯示畫面係於橫方向 爲長的長方形。因此 '，如將依據本發明之背 該種顯示裝置時，可以左右方向的亮度角 方向的亮度角度分佈更寬。 依據本發明之顯示裝置，係具備：面光 陣列薄板；及凸鏡狀透鏡薄板；及顯示面板 被設置於凸鏡狀透鏡薄板之圓筒透鏡面上， 呈行列狀的複數個畫素。 以前述複數圓筒透鏡的排列間距Pc， 素中，排列於與前述圓筒透鏡的排列方向相 之排列間距Pp，係滿足公式（1 )爲佳。[Technical Field] The present invention relates to a backlight device, a display device, and an optical member, and more particularly to a backlight device used in a display device typified by a liquid crystal display, and a backlight device. The optical member used in the display device and the backlight device. [Prior Art] A display device represented by a liquid crystal display is required to have a high front luminance. Therefore, an optical member for illuminating the front luminance is provided in the backlight device constituting the display device. As disclosed in Japanese Patent No. 3 26223 (Patent Document 1), generally, an optical member is a thin plate. In recent years, further improvement in frontal brightness has been demanded, and a backlight device having various optical members has been proposed. Japanese Patent Laid-Open Publication No. Hei. No. 2-3-3 No. 1263 (Patent Document 2) discloses an optical member for a backlight device including a microlens array sheet 100 and a tantalum sheet 200 as shown in FIG. . Hereinafter, this optical member will be referred to as a leading optical member 300. In Patent Document 2, by superposing the thin plate 200 on the microlens array sheet 100, a higher light collecting effect can be obtained, and as a result, the front brightness can be particularly enhanced. However, according to the results of investigations by the inventors of the present application, it is known that the preceding optical member 300 has the following three problems. First: In the preceding optical member 300, a narrow angular distribution of luminance is generated. The width of the luminance angle distribution in the up and down direction when the preceding optical member 300 is set in such a manner that the parallel direction of the plurality of turns 201 on the thin plate is -5 - 200817792 as the upper and lower directions of the display screen of the display device It became very narrow. That is, the viewing angle in the vertical direction (hereinafter referred to as the upper and lower viewing angles) is narrowed. Fig. 15 is a view showing the distribution of luminance angles in the vertical direction and the horizontal direction of the preceding optical member 300 obtained by the inventors of the present application. The horizontal axis in the figure indicates the viewing angle. The viewing angle is Odeg in the normal direction of the optical member (i.e., the front side), and the tilt angle from the 0 d e g upward direction is positive (+) and the downward tilt angle is negative (-) for the up and down direction. Similarly, for the left-right direction, the inclination angle from 〇 d e g to the right direction is regarded as positive (+), and the inclination angle toward the left direction is regarded as negative (-). The vertical axis in the figure indicates the brightness. Here, the brightness is not such that an optical member is provided, and the front luminance (the luminance of the viewing angle Odeg) of the backlight device in which only the diffusion plate is provided in the opening portion is regarded as the relative luminance (unit: a. u.) of the reference (1. Referring to Fig. 15, the front luminance of the display screen, i.e., the luminance in the viewing angle Odeg is about 2.3 a·II·, which is higher than the front luminance (1.55 a.u.) of one prism sheet. However, the width of the luminance angle distribution (solid line in the figure) in the up and down direction is narrowed. Specifically, the range of the viewing angle of the luminance of 1 /2 or more of the front luminance (hereinafter referred to as the 1 /2 viewing angle range) is narrower than the range of ±35 deg, and is in the range of -30 to +30 deg. The angular distribution of the brightness in the up and down direction and the left and right direction is preferably a certain degree of width. The user of the display device also sees the display screen from the up and down direction and the left and right oblique directions. Therefore, the luminance angle distribution of any one of the two-axis directions (up-and-down direction and left-right direction) is preferably a width having a certain degree of -6 - 200817792. Specifically, in the luminance angle distribution in the two-axis direction, the range of the 1/2 field of view angle range is larger than ±3 5 deg is the second value: the brightness in the left-right direction obtained by the preceding optical member 300 The angular distribution (dotted line in the figure), if it is not the peak of the front brightness, the natural distribution of the brightness gradually decreases with the expansion of the viewing angle. The viewing angle is more than P1 (about - 50 deg) and P2 (about + 50 deg). When it is big, the intensity is extremely reduced. Such an extreme change in the slope of the brightness angle distribution causes an uncomfortable feeling to the user who views the display screen. Thirdly, the brightness in the upper and lower directions obtained by the preceding optical member 300 is gradually decreased as the viewing angle is increased, but rises again when it exceeds ±50 deg. That is, the luminance angle distribution in the up and down direction has the side ears S1 and S2. Such side ears S1 and S2 also cause a sense of discomfort to the user who views the display screen. [Patent Document 1] Patent No. 326 223 0 [Patent Document 2] Japanese Patent Laid-Open No. 2004-3 1 1 263 SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] An object of the present invention is to provide a high front surface The brightness and the brightness angle distribution in the 2-axis direction have a certain degree of wide backlight. More specifically, it is provided that the front luminance is higher than the front luminance of the backlight of one thin sheet, and in each distribution of the luminance angular distribution in the two-axis direction, the 1/2 viewing angle range is more than the range of ±35 deg. Large backlight unit. 200817792 Another object of the present invention is to provide: a directional distributed backlight device. More specifically, the backlight of the brightness angle distribution curve is extremely extreme. [Means for Solving the Problems and Effects of the Invention] According to the backlight device of the present invention, an array thin plate and a convex mirror lens sheet are provided. The microlens array sheet has: a face-to-face opposite side, and the thin plate formed with the plurality of microlenses has a backlight device according to the present invention in which a plurality of cylindrical lenses are formed in a plane facing the lenticular surface, and is attached to the convex device. Mirror lens sheet. The lenticular lens sheet is condensed by the microlens array, so that the front side bright backlight has a high front luminance. Further, in the case where the convex lens-shaped lens sheet is provided, the 1/2 field of view angle range in which the direction of the luminance angle distribution becomes extremely narrow and the direction of the longitudinal direction of the narrow lens is greater than ±35 deg. , its 1/2 field of view angle range is good. Further, the ear can be lowered and the extreme change can be made. It is natural that the microlens array thin plate and the convex mirror-shaped brightness angle distribution are natural, and it is possible to suppress the side ear: the surface light source; and the plane of the microlens surface light source, and the flat lens surface. Convex lens; and the opposite side of the plane, and the cylindrical lens surface. The light collected by the microlens array sheet is further convexized to be one sheet thinner than the tantalum sheet on the microlens array sheet to suppress the juxtaposition of the cylindrical lenses. Therefore, the 2-axis direction (circular brightness angle distribution, the range of any one is still large. The range of the 2-axis square ratio ± 50 deg is also large to suppress the brightness angle distribution of the oblique mirror sheet is preferably a rectangle, -8- 200817792 plural circles In the case where the cylindrical lens is attached to the convex lens-shaped lens sheet, the collecting effect of the cylindrical lens in the direction of the longitudinal direction of the cylindrical lens is large. Therefore, the brightness angle distribution in the longitudinal direction is shorter than that in the short-side direction. Generally, the display screen of the display device is a rectangle having a long horizontal direction. Therefore, when the display device according to the present invention is used, the luminance angle distribution in the direction of the luminance in the left-right direction can be made wider. The display device of the present invention includes: a surface light array sheet; and a convex mirror lens sheet; and the display panel is provided on a cylindrical lens surface of the convex mirror lens sheet, and has a plurality of pixels in a matrix. The arrangement pitch Pc of the plurality of cylindrical lenses is preferably arranged in the arrangement pitch Pp with respect to the arrangement direction of the cylindrical lenses, and the formula (1) is preferably satisfied.
Pc ^ Pp/5 (1) 在此情形時，可以抑制在顯示面板的畫 之間發生波紋。 【實施方式】 以下，參照圖面，詳細說明本發明之實 圖中相一或相當部分賦予同一符號，省略其 另外，在売度角度分佈圖中5貫線之曲線係 的短邊方向。 光效果，係比 亮度角度分佈 (左右方向） 光裝置適用於 度分佈比上下 源；及微透鏡 。顯示面板係 且具有被排列 及前述複數畫 同方向的畫素 素與背光裝置 施形態。對於 之重複說明。 表示上下方向 -9- 200817792 之亮度角度分佈’虛線之曲線係表示左右方向之亮度角度 分佈。 [顯示裝置] 參照第1及第2圖，顯示裝置1係具備：背光裝置 1 〇 ;及設置於背光裝置1 〇的正面之液晶面板20。液晶面 板2 0係具備排列呈行列狀的複數畫素。顯示裝置1的顯 示畫面係於左右方向（圖中X方向）具有長邊，於上下方 向（圖中y方向）具有短邊之長方形。 [背光裝置] 背光裝置1 〇係所謂直下型，具備：射出擴散光之面 光源11，及設置於面光源11上的薄板狀光學構件15。 面光源1 1係具備：外殼1 2 ;及複數根冷陰極管1 3 ; 及光擴散板1 4。外殼1 2係於正面具有開口部1 20的框體 ，於內部收納冷陰極管1 3。外殻1 2的內側表面係被反射 薄膜1 2 1所覆蓋。反射薄膜1 2 1係將從冷陰極管1 3所射 出的光線予以紊亂反射，將被紊亂反射的光線引導至開口 部120。反射薄膜121例如係以東麗製Lumirror (登錄商 標）E60L或E6 0V，擴散反射率爲95%以上者爲佳。 複數根冷陰極管1 3係於外殼1 2的背面近身側並設於 上下方向（圖1中y方向）。冷陰極管13係於左右方向 (圖1中X方向）延伸的線光源，例如爲螢光管。另外， 代替冷陰極管13，也可以於外殼12內收納LED ( Light -10- 200817792 E m i 11 i n g D e v i c e )等之複數個點光源。另外，也可以收納 線光源與點光源。 光擴散板1 4係被嵌入開口部1 2 0，且與外殼1 2的背 面並行配設。光擴散板14 一被嵌入開口部120時，外殼 1 2的內部被密閉。因此，可以防止從冷陰極管1 3所射出 的光線會從光擴散板1 4以外處所朝外殼1 2外浅漏，可以 提升光線的利用效率。 光擴散板1 4係將從冷陰極管1 3來之光線及在反射薄 膜1 2 1所被反射的光線幾乎均勻地予以擴散而射出正面。 光擴散板1 4係藉由：透明基材；及分散於基材內的複數 粒子所構成。分散於基材內的粒子，其對於可見光區域的 波長之光線的折射率係與基材不同。因此，光擴散板1 4 能將射入的光線予以擴散，且被擴散的光線透過光擴散板 1 4。光擴散板1 4的基材例如係由：玻璃或聚酯系樹脂、 聚碳酸酯系樹脂、聚丙烯酸酯系樹脂、脂環式聚烯系樹脂 、聚苯乙烯系樹脂、聚氯化乙烯系樹脂、聚醋酸乙烯系樹 脂、聚醚磺酸系樹脂、三乙醯纖維素系樹脂等之樹脂所形 成。光擴散板1 4而支撐光學構件1 5。 [光學構件] 參照第3〜5圖，光學構件1 5係具備：微透鏡陣列薄 板5 1 ;及設置於微透鏡陣列薄板51上之凸鏡狀透鏡薄板 52 ° 微透鏡陣列薄板51係薄板狀或薄膜狀，具有2個面 -11 - 200817792 (平面511及微透鏡面512).平g 。與平面5 1 1相反側之微透鏡面5 之複數個微透鏡5 1 3。各微透鏡5 1 微透鏡陣列薄板51係.由：基 於基材部5 00上之複數個微透鏡5 狀的基材部500對於可見光爲透明 酯系樹脂、聚碳酸酯系樹脂、聚丙 聚烯系樹脂、聚苯乙烯系樹脂、聚 酸乙烯系樹脂、聚醚磺酸系樹脂、 之樹脂所形成。透鏡部5 0 1也對於 由紫外線而硬化之紫外線硬化樹脂 由紫外線以外之其他的電離放射線 凸鏡狀透鏡薄板5 2係薄板狀: (平面521及圓筒透鏡面522).平 5 12。與平面521相反側之圓筒透彳 並設之複數個圓筒透鏡523。 凸鏡狀透鏡薄板5 2係由：基 材503上，且具備複數個圓筒透鏡 基材部5 03係藉由與基材部5 00相 透鏡部5 04係以藉由紫外線硬化樹 電離放射線而硬化的樹脂所構成。 [製造方法] 微透鏡陣列薄板5 1及凸鏡狀驾 Ϊ 5 1 1係面對面光源i工 〖2係形成有2次元排列 3係所謂平凸透鏡。 材部5 00 ;及具備形成 1 3之透鏡部5 0 1。薄板 ，例如係由：玻璃或聚 烯酸酯系樹脂、脂環式 氯化乙烯系樹脂、聚醋 三乙醯纖維素系樹脂等 可見光爲透明，且由藉 所形成。也可以使用藉 使其硬化之樹脂。 突薄膜狀，具有2個面 面521係面對微透鏡面 堯面522係形成有相互 材部5 03 ;及形成於基 之透鏡部5 04所構成。 同的前述樹脂所構成， 脂或紫外線以外的其他 鏡薄板52可以藉由通 -12- 200817792 常的製造方法來製造。製造微透鏡陣列薄板5 1之工程的 一例，係如下述。準備表面具有對應微透鏡5 1 3的複數凹 部之輥輪版。藉由鑄模塗佈機將紫外線硬化樹脂塗佈於輥 輪版上。塗佈後，一面將薄板狀的基材部5 00按壓於輥輪 版，一面照射紫外線而將透鏡部501轉印至基材部500。 藉由以上之工程，可以製造微透鏡陣列薄板5 1。凸鏡狀 透鏡薄板5 2也能藉由與微透鏡陣列薄板5 1相同的製造方 法來製造。此時，使用與圓筒透鏡5 23相同，表面具有成 爲橫切形狀的複數個溝之輥輪版。 另外，在前述之製造方法中，雖將紫外線硬化樹脂塗 佈於輥輪版上，但是也可以將紫外線硬化樹脂塗佈於基材 部5 00上。在此情形時，一面將輥輪版按壓於被塗佈於基 材部5 00上之紫外線硬化樹脂，一面藉由照射紫外線，可 以製造微透鏡陣列薄板5 1及凸鏡狀透鏡薄板52。另外， 也可以將紫外線硬化樹脂塗佈於輥輪版上與基材部5 00上 [作用] 具備有光學構件1 5之背光裝置1 0，係將從面光源1 1 所射出的擴散光予以聚光，來提升正面亮度。背光裝置 1〇進一步將亮度角度分佈的寬度維持得寬些。背光裝置 1 〇進而在亮度角度分佈中，抑制斜度之極端變化，且抑 制側耳之發生。以下，說明這些特徵。 一般而言，層積具有聚光功能的2片透鏡薄板所獲得 -13- 200817792 之亮度角度分佈的寬度，係比以具有聚光功能的1片透鏡 薄板所獲得的亮度角度分佈的寬度還窄。例如，具有並設 於上下方向之稜鏡透鏡的棱鏡薄板單體之亮度角度分佈係 如第6圖所示。另一方面，具有並設於上下方向之稜鏡透 鏡的先行光學構件3 00的亮度角度分佈係如第15圖所示 。如比較兩者，可以知道，先行光學構件3 00的上下方向 之亮度角度分佈的寬度比稜鏡薄板單體的上下方向之亮度 角度分佈的寬度還窄。 相對於此，背光裝置1 0所具備之光學構件1 5，係於 微透鏡陣列薄板5 1上設置凸鏡狀透鏡薄板52，雖說可以 提高正面亮度，但是也可以抑制上下方向之亮度角度分佈 寬度的減少。以下，說明此點。 第7圖係具有並設於上下方向（第1圖中之y方向） 的複數個圓筒透鏡5 23之凸鏡狀透鏡薄板52單體的亮度 角度分佈。另外，第8圖係具有並設於上下方向之複數個 圓筒透鏡5 23之光學構件15的亮度角度分佈。 參照第7圖，凸鏡狀透鏡薄板52單體之上下方向（y 方向）的亮度角度分佈的寬度比較寬。具體而言，1 /2視 野角度範圍爲±41deg之範圍，比±35deg之範圍還大。此 處，1 /2視野角度範圍係以下述方法求得。將上下方向的 亮度角度分佈中之視野角Odeg的亮度，與左右方向的亮 度角度分佈中之視野角度Odeg的亮度之平均當成光學構 件的正面亮度（a.u.)。第7圖中，正面亮度爲1.54a.u· 。將表示所求得之正面亮度的1 /2以上之亮度的視野角度 -14- 200817792 範圍當成1/2視野角度範圍。第7圖中，亮度爲0.77a. u. 以上之視野角度範圍係成爲1 /2視野角度範圍。 另一方面，第8圖所示之光學構件15的上下方向之 亮度角度分佈的寬度，對於第7圖之凸鏡狀透鏡薄板52 單體的上下方向之亮度角度分佈寬度，並沒有大幅地變窄 。即在微透鏡陣列薄板5 1上設置凸鏡狀透鏡薄板52之情 形時，上下方向的亮度角度分佈的寬度之減少被大幅地抑 制。因此，光學構件1 5具有高的正面亮度，.且可以將上 下方向之亮度角度分佈維持得寬些。具體而言，可以使 1/2視野角度範圍比±3 5 deg的範圍還大。第8圖中，上下 方向之1/2視野角度範圍爲±37deg。第8圖中，正面亮度 爲1.9a.u.，將表示〇.95a.u.以上的亮度之視野角度範圍當 成1/2視野角度範圍。 另外，光學構件1 5的左右方向之亮度角度分佈係比 凸鏡狀透鏡薄板52單體的左右方向之亮度角度分佈更窄 。因此，在光學構件15中，左右方向之亮度角度分佈寬 度的減少，被認爲係有助於正面亮度的提升。光學構件 1 5的左右方向之亮度角度分佈雖比凸鏡狀透鏡薄板52單 體的亮度角度分佈還窄，但是1 /2視野角度範圍係比 ±5 〇deg還大。第8圖中，左右方向之視野角度分佈爲 ±51deg。因此，光學構件15可以將2軸方向（上下方向 及左右方向）的亮度角度分佈之寬度維持得寬些。 另外，在第8圖所示之左右方向的亮度角度分佈中， 隨著視野角度變大，亮度平滑地降低，如第1 5圖所示之 -15- 200817792 先行光學構件3 00的左右方向之亮度角度分佈般，亮度的 斜度極端變化之點P 1及P2不會發生。因此，可以防止對 於從左右方向來觀看畫面的使用者造成不調和感。 另外，在第8圖所示之上下方向的亮度角度分佈中， 可以抑制側耳之發生。即光學構件1 5可以抑制側耳之發 生。 光學構件15進而如第8圖所不般’左右方向之売度 角度分佈係比上下方向之亮度角度分佈還寬。在液晶顯示 器中，以左右方向之亮度角度分佈比上下方向的亮度角度 分佈更寬者爲佳。如何說呢？此係顯示裝置的使用者比起 上下方向，在左右方向以更大的視野角度來觀看的機會比 較多的關係。光學構件1 5係於微透鏡陣列薄板5 1上設置 凸鏡狀透鏡薄板52，且將圓筒透鏡5 23並設於上下方向 (第1圖中之y方向）。因此，可以使左右方向之亮度角 度分佈比上下方向之亮度角度分佈更寬。另外，代替於微 透鏡陣列薄板5 1上設置凸鏡狀透鏡薄板52，在將微透鏡 陣列薄板5 1設置於凸鏡狀透鏡薄板52上之情形時，正面 亮度雖然提升，但是上下方向及左右方向的亮度角度分佈 的寬度，都變窄，且成爲相互相同程度的寬度。 顯示裝置1的顯示畫面係於橫方向比較長，光學構件 1 5爲長方形狀。即微透鏡陣列薄板51及凸鏡狀透鏡薄板 52係相互爲相同程度之尺寸的長方形，圓筒透鏡5 23係 被並設於短邊方向。藉此，長邊方向（左右方向）的亮度 角度分佈係變得比短邊方向（上下方向）的亮度角度分佈 -16- 200817792 還寬。另外’此處所謂之長方形狀’可以不是嚴格的長方 形，只要是具有長邊及短邊的矩形即可。另外’顯示畫面 不是長方形之情形時’微透鏡陣列薄板5 1及凸鏡狀透鏡 薄板52可以不是長方形’只要是對應顯不畫面的形狀即 可 〇 微透鏡5 1 3的凸面以球面爲佳。凸面如爲球面，可以 將來自面光源1 1的擴散光等方性地予以聚光。以微透鏡 513的凸面之曲率半徑R513爲1〇〜50#m、從凸面的頂點 至透鏡平面（包含凸面透鏡的邊緣之面）514爲止之微透 鏡的高度H513爲5〜50//m爲佳。以微透鏡面512中不形 成有微透鏡5 1 3之區域（以下’稱爲平坦部）對於微透鏡 面512整體之比率（以下，稱爲平坦部比率）爲10〜60 %，微透鏡陣列薄板5 1的高度H51爲100〜3 00 // m爲佳 。另外，平坦部比率係以從正上方來看微透鏡面5 1 2之情 形的微透鏡面5 1 2的面積（即與平面5 1 1相同面積）來除 平坦部的總面積之値（％ )。微透鏡陣列薄板5 1係以其 平坦部的總面積小者爲佳。平坦部對聚光並不幫助。如將 微透鏡作成六方最密排列的話，可使平坦部比率變小。 圓筒透鏡523的橫切面形狀，以圓弧或橢圓弧爲佳。 另外，相鄰之圓筒透鏡523係以相互接觸爲佳。即於相鄰 之圓筒透鏡5 2 3之間無間隙者爲佳。間隙部分對聚光並無 幫助。如本實施形態般，在面光源1 1以並設於上下方向 之複數個線光源（冷陰極管1 3 )來構成之情形時，在面 光源Π本身的正面亮度中，容易於上下方向產生亮度不 -17- 200817792 均。並設於上下方向之圓筒透鏡，其上下方向的聚光性 。因此，將圓筒透鏡的並設方向當成語構成面光源之複 個線光源的並設方向相同，且使相鄰之圓筒透鏡相互接 ，則可以解除在線光源的並設方向所產生的亮度不均。 於使相鄰之圓筒透鏡彼此無間隙地接觸上，以包含 筒透鏡5 23之邊緣的面（透鏡平面）與凸面所形成之角 (以下，稱爲接觸角）0 c爲銳角爲佳。在使0 c成爲 角之情形，將透鏡頂點成爲長軸的端點之橢圓弧設爲橫 形狀之圓筒透鏡，係具有比圓弧的圓筒透鏡更高的聚光 果。因此，圓筒透鏡5 23的橫切面形狀以長軸的端點成 透鏡頂點之橢圓弧爲佳。 橢圓弧係其短軸徑爲10〜130//m，長軸徑爲20 4〇〇 //m，從透鏡頂點至透鏡平面之高度H 5 2 3係以4〜 // m爲佳。相鄰之圓筒透鏡的頂點間距離（以下，稱爲 列間距）Pc係以1 0〜1 00 // m、凸鏡狀透鏡薄板的高 H52係以100〜350/zm爲佳。 如前述般，於液晶面板2 0上，複數個畫素被排列 行列壯。被排列於上下方向（y方向）之畫素中，於將 畫素的中心與相鄰之該其他畫素的中心之間的距離設爲 素排列間距Pp ( // m )時，畫素排列間距pp及圓筒透 的排列間距P c如滿足公式（1 )，則可以抑制波紋之發Pc ^ Pp/5 (1) In this case, it is possible to suppress ripples between the pictures on the display panel. [Embodiment] Hereinafter, the same reference numerals will be given to the same or corresponding portions in the drawings of the present invention, and the short-side direction of the curve of the 5-line line in the twist angle distribution map will be omitted. The light effect is proportional to the brightness angle distribution (left and right direction). The light device is suitable for the degree distribution ratio of the upper and lower sources; and the microlens. The display panel has a pixel element and a backlight device arranged in the same direction as the plurality of frames. Repeat the instructions for it. Indicates the vertical and horizontal direction -9- 200817792 The brightness angle distribution 'The dotted line curve indicates the brightness angle distribution in the left and right direction. [Display Device] Referring to FIGS. 1 and 2, the display device 1 includes a backlight device 1 and a liquid crystal panel 20 provided on the front surface of the backlight device 1 . The liquid crystal panel 20 has a plurality of pixels arranged in a matrix. The display screen of the display device 1 has a long side in the left-right direction (X direction in the drawing) and a rectangular shape having a short side in the upper and lower directions (in the y direction in the drawing). [Backlight device] The backlight device 1 is a so-called direct type, and includes a surface light source 11 that emits diffused light, and a thin plate-shaped optical member 15 that is provided on the surface light source 11. The surface light source 11 includes a casing 1 2 , a plurality of cold cathode tubes 1 3 , and a light diffusing plate 14 . The outer casing 12 is a casing having an opening 126 on the front surface, and houses the cold cathode tube 13 therein. The inner side surface of the outer casing 12 is covered by the reflective film 1 2 1 . The reflective film 1 2 1 turbulently reflects the light emitted from the cold cathode tube 13 and guides the light reflected by the disorder to the opening 120. The reflective film 121 is, for example, a Lumirror (registered trademark) E60L or E60 0V manufactured by Toray Industries, and preferably has a diffuse reflectance of 95% or more. A plurality of cold cathode tubes 13 are attached to the back side of the outer casing 12 and are disposed in the up and down direction (y direction in Fig. 1). The cold cathode tube 13 is a line source extending in the left-right direction (X direction in Fig. 1), for example, a fluorescent tube. Further, instead of the cold cathode tube 13, a plurality of point light sources such as LEDs (Light -10- 200817792 E m i 11 i n d D e v i c e ) may be housed in the casing 12. In addition, it is also possible to store a line source and a point source. The light diffusing plate 14 is fitted into the opening portion 120 and disposed in parallel with the back surface of the outer casing 12. When the light diffusing plate 14 is fitted into the opening portion 120, the inside of the outer casing 12 is sealed. Therefore, it is possible to prevent light emitted from the cold cathode tube 13 from leaking from the outside of the light diffusing plate 14 toward the outside of the outer casing 12, which can improve the utilization efficiency of light. The light diffusing plate 14 diffuses the light from the cold cathode tube 13 and the light reflected by the reflecting film 1 21 into the front surface almost uniformly. The light diffusing plate 14 is composed of a transparent substrate and a plurality of particles dispersed in the substrate. The particles dispersed in the substrate have a refractive index different from that of the substrate for the light of the wavelength in the visible light region. Therefore, the light diffusing plate 14 can diffuse the incident light, and the diffused light passes through the light diffusing plate 14. The base material of the light diffusing plate 14 is, for example, glass, polyester resin, polycarbonate resin, polyacrylate resin, alicyclic polyolefin resin, polystyrene resin, or polyvinyl chloride. It is formed of a resin such as a resin, a polyvinyl acetate resin, a polyether sulfonic acid resin, or a triacetyl cellulose resin. The optical diffusing plate 14 supports the optical member 15. [Optical member] Referring to Figures 3 to 5, the optical member 15 includes a microlens array sheet 5 1 and a convex mirror lens sheet 52 provided on the microlens array sheet 51. The microlens array sheet 51 is a thin plate. Or film-like, with 2 faces -11 - 200817792 (plane 511 and lenticular surface 512). Flat g. A plurality of microlenses 5 1 3 of the lenticular surface 5 on the side opposite to the plane 5 1 1 . Each of the microlenses 5 1 microlens array sheet 51 is composed of a plurality of microlenses 5 based on the base portion 500, and the base portion 500 is a transparent ester resin, a polycarbonate resin, or a polypropylene polyene. It is formed of a resin, a polystyrene resin, a polyamic acid resin, a polyether sulfonic acid resin, or a resin. The lens portion 510 is also an ultraviolet curable resin which is cured by ultraviolet rays. The ionizing radiation convex mirror lens sheet 5 2 other than ultraviolet rays is in the form of a thin plate: (plane 521 and cylindrical lens surface 522). A plurality of cylindrical lenses 523 are disposed in a cylindrical shape opposite to the plane 521. The convex mirror lens sheet 5 2 is composed of a plurality of cylindrical lens base portions 503 on the base material 503, and is irradiated with ultraviolet rays by the ultraviolet light-hardening tree by the lens portion 504 of the base portion. And composed of hardened resin. [Manufacturing method] Microlens array sheet 5 1 and convex mirror driving 1 5 1 1 Face-to-face light source i [2 series formed with 2 dimensional arrangement 3 series so-called plano-convex lens. a material portion 500; and a lens portion 501 formed with 1 3 . The thin plate is made of, for example, glass or a polyester resin, an alicyclic vinyl chloride resin, or a polyethylene triacetate cellulose resin. The visible light is transparent and formed by borrowing. It is also possible to use a resin which is hardened by it. In the form of a film, the two faces 521 are formed to face the microlens face 522, and the mutual portion 503 is formed, and the lens portion 504 is formed on the base. The same resin is used, and the mirror sheet 52 other than the grease or the ultraviolet ray can be manufactured by the usual manufacturing method of -12-200817792. An example of the process for manufacturing the microlens array sheet 5 1 is as follows. A roll plate having a surface corresponding to the plurality of concave portions of the microlens 5 1 3 is prepared. The ultraviolet curable resin was applied to the roller plate by a die coater. After the application, the thin plate-shaped base material portion 500 is pressed against the roller plate, and the lens portion 501 is transferred to the base portion 500 while being irradiated with ultraviolet rays. By the above works, the microlens array sheet 51 can be manufactured. The convex mirror lens sheet 52 can also be manufactured by the same manufacturing method as the microlens array sheet 51. At this time, as with the cylindrical lens 523, the surface has a plurality of roll plates which are formed into a cross-sectional shape. Further, in the above-described production method, the ultraviolet curable resin is applied to the roll plate, but the ultraviolet curable resin may be applied to the base portion 500. In this case, the microlens array sheet 5 1 and the convex mirror-shaped lens sheet 52 can be produced by pressing the roll plate on the ultraviolet curable resin applied to the base portion 500 while irradiating the ultraviolet rays. Further, the ultraviolet curable resin may be applied to the roller plate and the base portion 500. [Action] The backlight device 10 including the optical member 15 is used to diffuse light emitted from the surface light source 1 1 . Spotlight to enhance front brightness. The backlight unit 1 further maintains the width of the luminance angle distribution wider. In the luminance angle distribution, the backlight device 1 suppresses extreme changes in the slope and suppresses the occurrence of the side ears. These features will be described below. In general, the width of the luminance angle distribution obtained by laminating two lens sheets having a condensing function from -13 to 200817792 is narrower than the width of the luminance angle distribution obtained by using one lens sheet having a condensing function. . For example, the luminance angle distribution of the prism sheet having the 稜鏡 lens disposed in the up and down direction is as shown in Fig. 6. On the other hand, the luminance angle distribution of the preceding optical member 300 having the pupil lens disposed in the up and down direction is as shown in Fig. 15. As a result of comparing the two, it is understood that the width of the luminance angular distribution in the vertical direction of the leading optical member 300 is narrower than the width of the luminance angular distribution in the vertical direction of the single thin plate. On the other hand, in the optical member 15 provided in the backlight device 10, the convex lens-shaped lens sheet 52 is provided on the microlens array sheet 51, and although the front luminance can be improved, the luminance angular distribution width in the vertical direction can be suppressed. Reduction. This point will be explained below. Fig. 7 is a view showing the angular distribution of the brightness of the convex mirror-like lens sheet 52 of a plurality of cylindrical lenses 523 provided in the vertical direction (the y direction in Fig. 1). Further, Fig. 8 is a view showing the luminance angular distribution of the optical member 15 having a plurality of cylindrical lenses 523 provided in the vertical direction. Referring to Fig. 7, the width of the luminance angle distribution of the convex mirror lens sheet 52 in the upper and lower directions (y direction) is relatively wide. Specifically, the 1 /2 field angle range is ±41 deg, which is larger than the range of ±35 deg. Here, the 1 /2 field of view angle range is obtained by the following method. The average of the brightness of the viewing angle Odeg in the luminance angle distribution in the vertical direction and the viewing angle Odeg in the luminance angular distribution in the left and right directions is taken as the front luminance (a.u.) of the optical member. In Fig. 7, the front luminance is 1.54a.u·. The range of the viewing angle -14 - 200817792 indicating the luminance of 1 /2 or more of the obtained front luminance is regarded as the 1/2 viewing angle range. In Fig. 7, the luminance is 0.77a. u. The above viewing angle range is 1 /2 field angle range. On the other hand, the width of the luminance angle distribution in the vertical direction of the optical member 15 shown in Fig. 8 does not greatly change the width of the luminance angle distribution in the vertical direction of the convex mirror lens sheet 52 of Fig. 7 . narrow. That is, when the convex lens-like lens sheet 52 is provided on the microlens array sheet 51, the decrease in the width of the luminance angle distribution in the vertical direction is largely suppressed. Therefore, the optical member 15 has a high front luminance, and the luminance angle distribution in the up and down direction can be maintained wider. Specifically, the 1/2 field angle range can be made larger than the range of ±3 5 deg. In Fig. 8, the 1/2 field of view angle in the up and down direction is ±37 deg. In Fig. 8, the front luminance is 1.9 a.u., and the range of the viewing angle of the luminance indicating 〇.95 a.u. or more is taken as the 1/2 viewing angle range. Further, the luminance angle distribution in the left-right direction of the optical member 15 is narrower than the luminance angle distribution in the left-right direction of the single convex lens-like lens sheet 52 alone. Therefore, in the optical member 15, the decrease in the width distribution of the luminance in the left-right direction is considered to contribute to the improvement of the front luminance. The luminance angular distribution of the optical member 15 in the left-right direction is narrower than the luminance angular distribution of the convex mirror-like lens sheet 52, but the 1 / 2 viewing angle range is larger than ±5 〇 deg. In Fig. 8, the viewing angle distribution in the left and right direction is ±51 deg. Therefore, the optical member 15 can maintain the width of the luminance angle distribution in the two-axis directions (up-and-down direction and left-right direction) wider. Further, in the luminance angle distribution in the left-right direction shown in Fig. 8, as the viewing angle is increased, the luminance is smoothly lowered, as shown in Fig. 15 to -15-200817792, in the left-right direction of the optical member 300. As with the brightness angle distribution, points P 1 and P 2 where the slope of the brightness changes extremely do not occur. Therefore, it is possible to prevent a sense of discomfort for a user who views the screen from the left and right direction. Further, in the luminance angle distribution in the upper and lower directions shown in Fig. 8, the occurrence of the side ears can be suppressed. That is, the optical member 15 can suppress the occurrence of the side ears. Further, in the optical member 15, as shown in Fig. 8, the angular distribution in the left-right direction is wider than the luminance angular distribution in the vertical direction. In the liquid crystal display, it is preferable that the luminance angle distribution in the left-right direction is wider than the luminance angle distribution in the up-and-down direction. How to say it? Compared with the up and down direction, the user of the display device has a greater chance of viewing at a larger viewing angle in the left and right direction. The optical member 15 is provided with a convex lens-shaped lens sheet 52 on the microlens array sheet 5, and the cylindrical lens 523 is placed in the vertical direction (the y direction in Fig. 1). Therefore, the luminance angle distribution in the left and right direction can be made wider than the luminance angle distribution in the up and down direction. Further, instead of providing the mirror-like lens sheet 52 on the microlens array sheet 51, when the microlens array sheet 51 is placed on the convex mirror-shaped lens sheet 52, the front luminance is improved, but the vertical direction is left and right. The width of the luminance angular distribution of the direction is narrowed and becomes the same width as each other. The display screen of the display device 1 is relatively long in the lateral direction, and the optical member 15 has a rectangular shape. That is, the microlens array sheet 51 and the convex mirror lens sheet 52 are rectangular shapes having the same size as each other, and the cylindrical lens 523 is disposed in the short side direction. Thereby, the luminance angular distribution in the longitudinal direction (left-right direction) is wider than the luminance angular distribution -16-200817792 in the short-side direction (up-and-down direction). Further, the term "rectangular shape" as used herein may not be a strict rectangular shape, and may be any rectangle having a long side and a short side. Further, when the display screen is not rectangular, the microlens array sheet 5 1 and the convex mirror lens sheet 52 may not be rectangular as long as the shape corresponding to the display screen is 〇. The convex surface of the microlens 5 1 3 is preferably a spherical surface. If the convex surface is a spherical surface, the diffused light from the surface light source 11 can be condensed in an isotropic manner. The height H513 of the microlens from the apex of the convex surface to the lens plane (the surface including the edge of the convex lens) 514 is 5 to 50//m. good. The ratio of the region in which the microlens 51 1 is not formed in the microlens surface 512 (hereinafter referred to as a flat portion) to the entire lenticular surface 512 (hereinafter referred to as a flat portion ratio) is 10 to 60%, and the microlens array is used. The height H51 of the thin plate 51 is preferably 100 to 300 pm. Further, the flat portion ratio is the area of the lenticular surface 51 2 in the case where the lenticular surface 5 1 2 is viewed from the upper side (that is, the same area as the plane 511) to divide the total area of the flat portion (%) ). The microlens array sheet 51 is preferably such that the total area of the flat portions is small. The flat portion does not help to collect light. If the microlenses are arranged in a hexagonal arrangement, the flat portion ratio can be made small. The cross-sectional shape of the cylindrical lens 523 is preferably an arc or an elliptical arc. Further, it is preferable that the adjacent cylindrical lenses 523 are in contact with each other. That is, it is preferable that there is no gap between adjacent cylindrical lenses 5 2 3 . The gap portion does not help to collect light. In the case where the surface light source 1 1 is configured by a plurality of line light sources (cold cathode tubes 13) disposed in the vertical direction as in the present embodiment, it is easy to generate the front side luminance of the surface light source itself. Brightness is not -17- 200817792. The cylindrical lens is disposed in the vertical direction and has a condensing property in the vertical direction. Therefore, when the direction in which the cylindrical lenses are arranged is the same as the direction in which the plurality of line sources constituting the surface light source are arranged in the same direction, and the adjacent cylindrical lenses are connected to each other, the brightness generated by the parallel direction of the line source can be released. Uneven. It is preferable that the adjacent cylindrical lenses are in contact with each other without a gap, and the angle formed by the surface (lens plane) including the edge of the cylindrical lens 523 and the convex surface (hereinafter referred to as the contact angle) 0 c is an acute angle. In the case where 0 c is made into an angle, the elliptical arc whose end point of the lens is the long axis is a cylindrical lens having a horizontal shape, and has a higher concentration than the cylindrical lens of the circular arc. Therefore, the cross-sectional shape of the cylindrical lens 523 is preferably an elliptical arc whose end point of the long axis is the apex of the lens. The elliptical arc system has a short axis diameter of 10 to 130//m and a major axis diameter of 20 4 〇〇 //m, and the height H 5 2 3 from the apex of the lens to the lens plane is preferably 4 to // m. The distance between the apexes of the adjacent cylindrical lenses (hereinafter referred to as column pitch) Pc is 10 0 to 1 00 // m, and the height of the convex lens-shaped lens sheet is preferably 100 to 350 / zm. As described above, on the liquid crystal panel 20, a plurality of pixels are arranged in a row and row. Arranged in the pixels in the up and down direction (y direction), when the distance between the center of the pixel and the center of the adjacent other pixels is the prime arrangement pitch Pp ( // m ), the pixel arrangement If the pitch pp and the cylindrical arrangement pitch P c satisfy the formula (1), the ripple can be suppressed.
Pc ^ Pp/5 (1) 筒 數 觸 圓 度 銳 切 效 微 80 排 度 呈 某 畫 鏡 生 -18- 200817792 [實施例] [實施例1] 製造依據第3〜5圖所示形狀之本實施例 及第1 4圖所示之形狀的先行光學構件，調查 角度分佈。 以以下方法來製造構成依據本實施例之光 透鏡陣列薄板。準備具有對應微透鏡之複數個 六方細密狀之表面的輥輪版。另外，準備厚度 聚乙烯對苯二甲酯（PET )薄膜做爲基材。使 機於輥輪版上塗佈紫外線硬化樹脂。接著，一 向搬運PET薄膜一面按壓輥輪版，並照射紫 線硬化樹脂硬化，來作爲微透鏡陣列薄板。 另外，藉由與微透鏡陣列薄板相同的方法 依據本實施例之光學構件的凸鏡狀透鏡薄板。 準備具有各橫切形狀爲橢圓弧，且各於外周方 且相互並設於軸方向之複數個溝之輥輪版，於 輪版上塗佈紫外線硬化樹脂。接著，將輥輪版 188// m的PET薄膜上，且照射紫外線硬化樹 線硬化樹脂硬化，來當成凸鏡狀透鏡薄板。 所製造的凸鏡狀透鏡薄板之形狀尺寸，係 微透鏡的透鏡平面的半徑爲15//m，高度爲1 ，凸面的曲率半徑爲1 5 // m。從微透鏡的邊緣 其他的微透鏡之邊緣爲止的最短距離（以下， 最短距離）爲7.8 // m，平坦部比率爲43%。 的光學構件 個別之亮度 學構件的微 凹部排列爲 1 8 8 /z m 之 用鑄模塗佈 面於長邊方 外線使紫外 來製造構成 具體而言， 向延伸，並 所準備的輥 按壓於厚度 脂，使紫外 如下述。各 5 // m。另外 至相鄰之該 稱爲平坦部 凸鏡狀透鏡 -19- 200817792 薄板的高度爲2 1 0 // m。另外，所製造的凸鏡狀透鏡之形 狀尺寸係如下述。各圓筒透鏡的橫切面形狀係以長軸的端 點爲透鏡頂點之橢圓弧，長軸直徑爲短軸直徑 爲58.8//m，高度爲23.7//m。接觸角0c爲70deg，排列 間距Pc爲50 // m。凸鏡狀透鏡薄板的高度爲220 // m。 先行光學構件係以與前述本實施例的光學構件同樣的 方法所製造。凸鏡狀透鏡薄板的尺寸形狀係與構成本實施 例之光學構件的凸鏡狀透鏡薄板相同。另外，稜鏡薄板的 形狀尺寸係如下述。各棱鏡的頂角爲90deg，高度爲25 // m。相鄰棱鏡係相互接觸。稜鏡薄板的高度爲220 // m 〇 使用所製作之本實施例的光學構件來調查亮度角度分 佈。於收納冷陰極管，且於內面設置反射薄膜，並於開口 部嵌裝有光擴散板之外殻設置光學構件。此時，圓筒透鏡 的並設方法係設爲上下方向。 於外殼設置本實施例之光學構件後，調查亮度角度分 佈。視野角度係以光學構件的法線方向（正面）爲〇度軸 ，將從〇度軸朝上下方向之傾斜角當成上下視野角度，從 0度軸朝左右方向之傾斜角當成左右視野角度。各上下視 野角度及左右視野角度，係藉由亮度計來測定。 同樣地，於外殼設置比較例之先行光學構件，調查亮 度角度分佈。此時，稜鏡透鏡的並設方向係設爲上下方向 本實施例之光學構件的亮度角度分佈係如第8圖所示 -20- 0 200817792 ，比較例之先行光學構件的亮度角度分佈係如第1 5圖所 示。本實施例之光學構件的正面亮度爲1.9 ( a.u·)，比 棱鏡薄板單體的正面亮度（=1.55)還高。另外，本實施 例之光學構件的上下方向及左右方向的亮度角度分佈，可 以維持某種程度之寬度。具體而言，上下方向之1 /2視野 角度範圍（亮度成爲〇.95a.u.以上之視野角度範圍）爲 ±37deg之範圍，係比±35deg的範圍還大。左右方向之1/2 視野角度範圍係爲±51deg的範圍，比±50deg的範圍還大 。另一方面，先行光學構件中，上下方向之亮度角度分佈 的1/2視野角度範圍係爲±30deg。 另外，本實施例之光學構件的亮度角度分佈，在上下 方向及左右方向都平滑而成爲自然之定向分佈，沒有如先 行光學構件般之亮度角度分佈的傾斜之極端地變化（地點 P1及P2)。另外，在本實施例之光學構件的上下方向之 亮度角度分佈中，側耳之發生受到抑制。 進而，使用本實施例之光學構件，使用以下方法來實 施亮度不均及波紋的調查。首先，準備亮度不均及波紋觀 察用之外殼。於所準備的外殼內並設1 6根的冷陰極管。 相鄰冷陰極管的軸心彼此間之距離，係爲20〜26.5mm。 於外殻正面嵌入有具有65 %的全光線透過率之擴散板。 擴散板的尺寸爲3 2英吋。於所準備的外殼之正面設置本 實施例之光學構件。此時，圓筒透鏡的並設方向係設爲上 下方向。而且，將包含排列呈行列狀的複數畫素之液晶面 板設置於光學構件上，來製作液晶顯示裝置。於複數個畫 -21 - 200817792 素中，排列於上下方向之畫素的排列間距Pp爲5 00 // m。 亦即，本實施例之光學構件之Pc ( =50 // m )爲Pp/5(=100 /zm)以下，滿足公式（1)。 針對所製作的液晶顯示器的全視野角度，目視觀察亮 度不均。其結果，沒有發現亮度不均。進而，針對全視野 角度，目視觀察波紋。其結果，沒有發現波紋。 [實施例2] 製作具備有與實施例1不同形狀的凸鏡狀透鏡薄板之 光學構件，且調查亮度角度分佈。具體而言，使用與實施 例1相同的方法來製造微透鏡陣列薄板及凸鏡狀透鏡薄板 。所製造的凸鏡狀透鏡薄板之形狀尺寸係如下述。各圓筒 透鏡的橫切面形狀係以長軸的端點爲透鏡頂點之橢圓弧， 長軸直徑爲l〇〇//m，短軸直徑爲 58.8//m，高度爲22.0 //m。接觸角0c爲67.4deg，排列間距Pc爲48//m。凸 鏡狀透鏡薄板的高度爲2 1 5 μ m。凸鏡狀透鏡薄板的該其 他形狀尺寸及微透鏡陣列的形狀尺寸，係與實施例1的光 學構件相同。與實施例1相同地將所製造的光學構件設置 於外殼，且調查亮度角度分佈。圓筒透鏡的並設方向係設 爲上下方向。 第9圖表示本實施例之光學構件的亮度角度分佈。參 照第9圖，本實施例之光學構件的正面亮度爲1.9 ( a.u. )。另外，在本實施例之光學構件的亮度角度分佈中，上 下方向之1/2視野角度範圍（亮度成爲0.95a.u.以上之視 -22- 200817792 野角度箪G圍）爲±36deg的範圍，比±35deg的範圍還大。 左右方向之1/2視野角度範圍爲±50.5deg的範圍，比 ± 5 Odeg的範圍還大。另外，本實施例之光學構件的上下 方向及左右方向之亮度角度分佈，係成爲自然之定向分佈 ’在上下方向之亮度角度分佈中，側耳之發生受到抑制。 進而，使用與實施例1相同之亮度不均及波紋觀察用 外殻；及本實施例之光學構件；及與實施例1相同之液晶 面板，來製作液晶顯示裝置。此時，Pc( = 48 // m)係未滿 Pp/5(=100# m)，滿足公式（1)。 針對所製作之液晶顯示器的全視野角度，以目視觀察 亮度不均。其結果，沒有發現亮度不均。進而，針對全視 野角度，以目視觀察波紋。其結果，沒有發現波紋。 [實施例3 ] 製作具備有與實施例1及2不同形狀的微透鏡陣列薄 板之光學構件，且調查亮度角度分佈。具體而言，使用與 實施例1相同的方法來製造微透鏡陣列薄板及凸鏡狀透鏡 薄板。所製造的微透鏡陣列薄板之形狀尺寸係如下述。各 微透鏡的透鏡平面半徑爲15//m，高度爲15//m，凸面的 曲率半徑爲15//m。平坦部最短距離爲5.2/zm，平坦部 比率爲3 4 %。微透鏡陣列薄板之其他的形狀尺寸及凸鏡 狀透鏡薄板之形狀尺寸，係與實施例1相同。與實施例1 相同地將所製造的光學構件設置於外殻，且調查亮度角度 分佈。圓筒透鏡的並設方向係設爲上下方向。 -23- 200817792 本實施例之光學構件的亮度角度分佈係如 示。本實施例之光學構件的正面亮度爲1.95 且，上下方向之1/2視野角度範圍（亮度成爲 上之視野角度範圍）爲±3 6 deg之範圍。左右方 野角度範圍係爲±50.5 deg的範圍。其他的光學 施例1的光學構件相同。 [實施例4] 製作具備有與實施例1〜3不同形狀的微 板之光學構件，且調查亮度角度分佈。具體而 實施例1相同的方法來製造微透鏡陣列薄板及 薄板。所製造的微透鏡陣列薄板之形狀尺寸係 微透鏡的透鏡平面半徑爲高度爲15^ 曲率半徑爲15//m。平坦部最短距離爲 比率爲 52 %。微透鏡陣列薄板之其他的形狀 狀透鏡薄板之形狀尺寸，係與實施例1相同。 相同地將所製造的光學構件設置於外殼’且調 分佈。圓筒透鏡的並設方向係設爲上下方向。 本實施例之光學構件的亮度角度分佈係如 示。本實施例之光學構件的正面亮度爲1 · 8 5 ( 且，上下方向之1/2視野角度範圍（亮度成爲 上之視野角度範圍）爲±3 6 deg之範圍。左右方 野角度範圍係爲±51 deg的範圍。其他的光學 施例1的光學構件相同。 第10圖所 (a.u.)。而 0 · 9 7 5 a · u ·以 「向之1/2視 特性係與實 透鏡陣列薄 言，使用與 凸鏡狀透鏡 如下述。各 〃 m，凸面的 :m，平坦部 尺寸及凸鏡 與實施例1 查亮度角度 第1 1圖所 ；a.u.)。而 0 · 9 2 5 a · u ·以 向之1 / 2視 特性係與實 -24- 200817792 [比較例1 ] 使用與實施例1相同的方法來製造第1 2圖所示之橫 切面形狀的稜鏡薄板。棱鏡薄板的形狀尺寸係如下述。各 稜鏡的頂點爲90deg，高度爲25 μ m。相鄰稜鏡係相互接 觸。稜鏡透鏡薄板的高度（從稜鏡頂點至稜鏡透鏡薄板的 底面爲止之高度）爲220//m。 將所製造的稜鏡薄板設置於前述之外殼，且調查亮度 角度分佈。此時，棱鏡的並設方向係設爲上下方向。所獲 得之亮度角度分佈係如第6圖所示。正面亮度爲1.55a.u.Pc ^ Pp/5 (1) The number of roundness of the cylinder is sharp and the effect is slightly 80. The arrangement is a mirror -18- 200817792 [Examples] [Example 1] The shape according to the shape shown in Figures 3 to 5 is manufactured. The leading optical members of the examples and the shapes shown in Fig. 14 were investigated for angular distribution. The optical lens array sheet constituting the present embodiment was fabricated in the following manner. A roller plate having a plurality of hexagonal fine-grained surfaces corresponding to the microlenses is prepared. In addition, a polyethylene terephthalate (PET) film was prepared as a substrate. The machine is coated with an ultraviolet curing resin on a roller plate. Next, the PET film was conveyed while pressing the roll plate, and it was cured by irradiation with a violet hardening resin to obtain a microlens array sheet. Further, the convex mirror-like lens sheet of the optical member of the present embodiment is used in the same manner as the microlens array sheet. A roll plate having a plurality of grooves each having an elliptical arc in cross-cut shape and each of which is disposed on the outer circumference and arranged in the axial direction is prepared, and an ultraviolet curable resin is applied to the wheel plate. Next, the PET film of the roll plate 188 / / m was cured on the PET film hardened by the ultraviolet curable resin to form a convex lens-shaped lens sheet. The shape of the convex lens-shaped lens sheet produced is such that the radius of the lens plane of the microlens is 15/m, the height is 1, and the radius of curvature of the convex surface is 1 5 // m. The shortest distance (hereinafter, the shortest distance) from the edge of the other microlens from the edge of the microlens is 7.8 // m, and the flat portion ratio is 43%. The optical member has a micro-recessed portion of the luminance member arranged at a density of 1 8 8 /zm. The coated surface is coated on the long side of the long side to form an ultraviolet ray. Specifically, the roller is pressed and the prepared roller is pressed against the thickness of the grease. So that the UV is as follows. Each 5 // m. In addition, it is called a flat portion. The convex lens lens -19- 200817792 has a height of 2 1 0 // m. Further, the shape of the convex lens lens to be manufactured is as follows. The cross-sectional shape of each cylindrical lens is an elliptical arc whose end point of the long axis is the apex of the lens, and the major axis has a minor axis diameter of 58.8 / / m and a height of 23.7 / / m. The contact angle 0c is 70 deg, and the arrangement pitch Pc is 50 // m. The height of the convex mirror lens sheet is 220 // m. The leading optical member is manufactured in the same manner as the optical member of the foregoing embodiment. The lenticular lens sheet has the same size and shape as the convex mirror lens sheet constituting the optical member of the present embodiment. Further, the shape and size of the tantalum sheet are as follows. Each prism has an apex angle of 90 deg and a height of 25 // m. Adjacent prisms are in contact with each other. The height of the crucible sheet was 220 // m. The optical member of the present embodiment produced was used to investigate the brightness angle distribution. An optical member is provided in a casing in which a cold cathode tube is housed and a reflective film is provided on the inner surface, and a light diffusing plate is fitted in the opening. At this time, the method of juxtaposed the cylindrical lens is set to the vertical direction. After the optical member of this embodiment was placed on the outer casing, the brightness angle distribution was investigated. The viewing angle is defined by the normal direction of the optical member (front side) and the vertical angle from the yaw axis to the vertical direction. The inclination angle from the 0 degree axis to the left and right direction is the left and right viewing angle. The upper and lower viewing angles and the left and right viewing angles are measured by a luminance meter. Similarly, the leading optical member of the comparative example was placed on the outer casing to investigate the angle distribution of the brightness. In this case, the direction in which the 稜鏡 lens is arranged is the vertical direction. The brightness angle distribution of the optical member of the present embodiment is as shown in Fig. 8 - -20-200817792, and the brightness angle distribution of the preceding optical member of the comparative example is as follows. Figure 15 shows. The front member of the optical member of this embodiment has a front luminance of 1.9 (a.u.), which is higher than the front luminance of the prismatic sheet member (=1.55). Further, the angular distribution of the luminance in the vertical direction and the horizontal direction of the optical member of the present embodiment can be maintained to a certain extent. Specifically, the 1 /2 field of view angle range (the brightness becomes 视野.95a.u. or more) is ±37 deg in the vertical direction, which is larger than the range of ±35 deg. The 1/2 field of view angle in the left and right direction is in the range of ±51 deg, which is larger than the range of ±50 deg. On the other hand, in the leading optical member, the 1/2 field angle range of the luminance angle distribution in the vertical direction is ±30 deg. Further, the angular distribution of the luminance of the optical member of the present embodiment is smooth in the vertical direction and the horizontal direction, and becomes a natural orientation distribution, and the inclination of the luminance angle distribution is not extremely changed as in the preceding optical member (positions P1 and P2). . Further, in the luminance angular distribution in the vertical direction of the optical member of the present embodiment, the occurrence of the side ears is suppressed. Further, using the optical member of the present embodiment, the following method was used to investigate the unevenness of brightness and the ripple. First, prepare an outer casing for uneven brightness and corrugation observation. A set of 16 cold cathode tubes were placed in the prepared casing. The distance between the axes of adjacent cold cathode tubes is 20 to 26.5 mm. A diffuser plate having a total light transmittance of 65% is embedded in the front surface of the casing. The size of the diffuser is 32 inches. The optical member of this embodiment is placed on the front side of the prepared casing. At this time, the direction in which the cylindrical lenses are arranged is set to the up-down direction. Further, a liquid crystal panel including a plurality of pixels arranged in a matrix is placed on an optical member to fabricate a liquid crystal display device. In the plural picture -21 - 200817792, the arrangement pitch Pp of the pixels arranged in the up and down direction is 5 00 // m. That is, the Pc (=50 // m ) of the optical member of the present embodiment is Pp/5 (=100 /zm) or less, and the formula (1) is satisfied. The unevenness of the brightness was visually observed for the full viewing angle of the produced liquid crystal display. As a result, no uneven brightness was found. Further, the ripple was visually observed for the full field of view. As a result, no ripple was found. [Example 2] An optical member including a convex mirror-like lens sheet having a shape different from that of Example 1 was produced, and the luminance angle distribution was examined. Specifically, a microlens array sheet and a convex mirror lens sheet were produced in the same manner as in Example 1. The shape and size of the manufactured convex lens-shaped lens sheet are as follows. The cross-sectional shape of each cylindrical lens is an elliptical arc whose end point of the long axis is the apex of the lens, the major axis diameter is l〇〇//m, the minor axis diameter is 58.8//m, and the height is 22.0 //m. The contact angle 0c was 67.4 deg, and the arrangement pitch Pc was 48//m. The height of the convex mirror lens sheet is 2 1 5 μ m. The other shape size of the convex mirror lens sheet and the shape size of the microlens array are the same as those of the optical member of the first embodiment. The manufactured optical member was placed on the outer casing in the same manner as in the first embodiment, and the luminance angular distribution was examined. The direction in which the cylindrical lenses are arranged is set to the up and down direction. Fig. 9 shows the angular distribution of the brightness of the optical member of the present embodiment. Referring to Fig. 9, the front member of the optical member of the present embodiment has a front luminance of 1.9 (a.u.). Further, in the luminance angular distribution of the optical member of the present embodiment, the range of the 1/2 field of view in the vertical direction (the brightness is 0.95 au or more, the range -22 - 200817792, the field angle 箪G circumference) is ±36 deg, and the ratio is ± The range of 35deg is still large. The 1/2 field of view angle in the left and right direction is in the range of ±50.5 deg, which is larger than the range of ± 5 Odeg. Further, in the optical member of the present embodiment, the angular distribution of the brightness in the up-and-down direction and the left-right direction is a natural orientation distribution. In the luminance angle distribution in the vertical direction, the occurrence of the side ears is suppressed. Further, the same brightness unevenness and corrugation observation outer casing as in the first embodiment; and the optical member of the present embodiment; and the same liquid crystal panel as in the first embodiment were used to fabricate a liquid crystal display device. At this time, Pc (= 48 // m) is less than Pp/5 (=100# m), which satisfies the formula (1). The brightness unevenness was visually observed for the full viewing angle of the produced liquid crystal display. As a result, no uneven brightness was found. Further, the ripples were visually observed for the full field angle. As a result, no ripple was found. [Example 3] An optical member having a microlens array sheet having a shape different from that of Examples 1 and 2 was produced, and the luminance angle distribution was examined. Specifically, a microlens array sheet and a convex mirror lens sheet were produced in the same manner as in the first embodiment. The shape and size of the manufactured microlens array sheet are as follows. Each of the microlenses has a lens plane radius of 15/m, a height of 15/m, and a convex surface having a radius of curvature of 15/m. The shortest distance of the flat portion is 5.2/zm, and the flat portion ratio is 34%. The other shape and dimensions of the microlens array sheet and the shape and size of the convex lens sheet are the same as in the first embodiment. The manufactured optical member was placed in the outer casing in the same manner as in the first embodiment, and the luminance angular distribution was examined. The direction in which the cylindrical lenses are arranged is set to the up and down direction. -23- 200817792 The brightness angle distribution of the optical member of this embodiment is as shown. The front member of the optical member of the present embodiment has a front luminance of 1.95 and a range of 1/2 viewing angle in the vertical direction (the luminance becomes the upper viewing angle range) of ±3 6 deg. The left and right field angle ranges are in the range of ±50.5 deg. The optical members of the other optical embodiment 1 are the same. [Example 4] An optical member having a microplate having a shape different from that of Examples 1 to 3 was produced, and the luminance angular distribution was examined. Specifically, the microlens array sheet and the sheet were produced in the same manner as in Example 1. The shape and size of the manufactured microlens array sheet is such that the lens plane radius of the microlens is 15^ and the radius of curvature is 15/m. The shortest distance of the flat part is 52%. The shape and size of the other shape-shaped lens sheets of the microlens array sheet are the same as those of the first embodiment. The manufactured optical member is similarly disposed on the outer casing 'and distributed. The direction in which the cylindrical lenses are arranged is set to the up and down direction. The angular distribution of the brightness of the optical member of this embodiment is as shown. The front surface brightness of the optical member of the present embodiment is 1 · 8 5 (and the range of the 1/2 field of view in the vertical direction (the brightness becomes the upper field of view angle range) is ±3 6 deg. The left and right square angle ranges are The range of ±51 deg. The optical components of the other optical example 1 are the same. Fig. 10 (au). And 0 · 9 7 5 a · u · "to the 1/2 viewing characteristic system and the real lens array thin In other words, the use of the convex lens lens is as follows. Each 〃 m, the convex surface: m, the flat portion size and the convex mirror and the first embodiment are checked for the brightness angle 1 1; au), and 0 · 9 2 5 a · u · 1/2 of the characteristics and the actual -24-200817792 [Comparative Example 1] The tantalum sheet of the cross-sectional shape shown in Fig. 2 was produced in the same manner as in Example 1. The shape and size are as follows. The apex of each 为 is 90 deg and the height is 25 μ m. The adjacent 稜鏡 series are in contact with each other. The height of the 稜鏡 lens sheet (the height from the apex to the bottom surface of the 稜鏡 lens sheet) 220//m. The manufactured slab is placed in the aforementioned casing, and the brightness angle is investigated. At this time, the parallel direction of the prism is set to the up and down direction. The obtained brightness angle distribution is as shown in Fig. 6. The front brightness is 1.55a.u.
[比較例2] 使用與實施例1相同的方法來調查實施例1所製造之 微透鏡陣列薄板單體的亮度角度分佈。本比較例的微透鏡 陣列薄板之亮度角度分佈係如第1 3圖所示。本比較例的 正面亮度爲1.53a.u·，比比較例1的稜鏡薄板的正面亮度 稍微低。另外，1 /2視野角度範圍在上下方向、左右方向 都爲 ±50deg。 [比較例3] 使用與實施例1相同的方法來調查實施例1所製造之 凸鏡狀透鏡薄板單體的亮度角度分佈。本比較例的凸鏡狀 透鏡薄板之亮度角度分佈係如第7圖所示。本比較例的正 -25- 200817792 面亮度爲1.5 4 a. u.，比比較例1的棱鏡薄板的正面亮度稍 微低。另外，上下方向之1/2視野角度範圍爲±41 deg，左 右方向之1/2視野角度範圍爲±59deg。 以上說明本發明之實施形態，但是前述之實施形態不 過是用以實施本發明之舉例而已。因此，本發明並限定於 前述之實施形態，在不脫離其旨意之範圍內，可以適當地 使前述之實施形態變形來實施。 【圖式簡單說明】 第1圖係具備有依據本發明之實施形態之背光裝置的 顯示裝置之斜視圖。 第2圖‘第1圖中之線II-II的剖面圖。 第3圖係第2圖所示之光學構件的斜視圖。 第4圖係構成第3圖所示之光學構件的微透鏡陣列薄 板之剖面圖。 第5圖係構成第3圖所示之光學構件的凸鏡狀透鏡薄 板之剖面圖。 第6圖係稜鏡薄板單體之亮度角度分佈圖。 第7圖係凸鏡狀透鏡薄板單體之亮度角度分佈圖。 第8圖實施例1之光學構件的亮度角度分佈圖。 第9圖係實施例2之光學構件之亮度角度分佈圖。 第10圖係實施例3之光學構件之亮度角度分佈圖。 第11圖係實施例4之光學構件之亮度角度分佈圖。 第1 2圖係稜鏡薄板之剖面圖。 -26- 200817792 第1 3圖係比較例之微透鏡陣列薄板單體的亮度角度 分佈圖。 第1 4圖係於先行技術文獻所揭示之光學構件的斜視 圖。 第15圖係第14圖所示之光學構件的亮度角度分佈圖 【主要元件符號說明】 1 :顯示裝置 1 0 :背光裝置 1 1 :面光源 20 :液晶面板 5 1 :微透鏡陣列薄板 52 :凸鏡狀透鏡薄板 511 、 521 :平面 5 1 2 :微透鏡面 5 1 3 :微透鏡 522 :圓筒透鏡面 523 :圓筒透鏡 -27-[Comparative Example 2] The luminance angular distribution of the microlens array sheet unit produced in Example 1 was investigated in the same manner as in Example 1. The luminance angle distribution of the microlens array sheet of this comparative example is as shown in Fig. 13. The front side luminance of this comparative example was 1.53 a.u·, which was slightly lower than the front surface brightness of the tantalum sheet of Comparative Example 1. In addition, the 1 /2 field of view angle range is ±50 deg in both the up and down direction and the left and right direction. [Comparative Example 3] The luminance angular distribution of the convex mirror lens sheet produced in Example 1 was investigated in the same manner as in Example 1. The brightness angle distribution of the convex mirror lens sheet of this comparative example is as shown in Fig. 7. The positive-25-200817792 surface brightness of this comparative example was 1.5 4 a. u., which was slightly lower than the front surface brightness of the prism sheet of Comparative Example 1. Further, the 1/2 field of view angle range in the up and down direction is ±41 deg, and the 1/2 field of view angle range in the left and right direction is ±59 deg. The embodiments of the present invention have been described above, but the foregoing embodiments are merely examples for carrying out the invention. Therefore, the present invention is not limited to the above-described embodiments, and the above-described embodiments can be appropriately modified and implemented without departing from the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a display device having a backlight device according to an embodiment of the present invention. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. Fig. 3 is a perspective view of the optical member shown in Fig. 2. Fig. 4 is a cross-sectional view showing a microlens array sheet constituting the optical member shown in Fig. 3. Fig. 5 is a cross-sectional view showing a convex mirror lens sheet constituting the optical member shown in Fig. 3. Figure 6 is a graph showing the angular distribution of the brightness of the single sheet. Fig. 7 is a graph showing the brightness angle distribution of the convex mirror lens sheet alone. Fig. 8 is a graph showing the angular distribution of the brightness of the optical member of the first embodiment. Figure 9 is a graph showing the angular distribution of the brightness of the optical member of Example 2. Fig. 10 is a graph showing the angular distribution of the brightness of the optical member of Example 3. Figure 11 is a graph showing the angular distribution of the brightness of the optical member of Example 4. Figure 12 is a cross-sectional view of a thin plate. -26- 200817792 Fig. 1 3 is a graph showing the brightness angle distribution of the microlens array sheet unit of the comparative example. Fig. 14 is a perspective view of the optical member disclosed in the prior art document. Fig. 15 is a graph showing the brightness angle distribution of the optical member shown in Fig. 14 [Description of main components] 1 : Display device 10: Backlight device 1 1 : Surface light source 20: Liquid crystal panel 5 1 : Microlens array sheet 52: Convex lens sheet 511, 521: plane 5 1 2 : lenticular surface 5 1 3 : microlens 522 : cylindrical lens surface 523 : cylindrical lens -27-