201113561 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種適合於具有優異的面均勻性及廣視 角之液晶顯示裝置、特別是汽車導航系統用液晶顯示裝置 之背光單元的光學單元’及使用該光學單元之背光單元。 【先前技術】 液晶顯示裝置被廣泛用作電視或個人電腦等之畫面之 <’、'頁示裝置’大致分為直接觀看顯示晝面之直視式與觀看螢 幕上映出之衫像之^又影式。直視式液晶顯示裝置中，有透 射背光之光的透射式、不具有背光而使用自然光或室内燈 等之反射光的反射式、及於亮處成為反射式且於暗處成為 透射式之半透射式。另一方面，投影式液晶顯示裝置中， 有於前表面之螢幕中映出影像之前投式、及將螢幕納入至 顯不器機櫃内而映出影像之背投式。現今，直視式、其中 透射式之液晶顯示裝置係作為主流而普遍使用。 對於透射式液晶顯示裝置而言，自背面照亮液晶層之 月光方式較為普及，於液晶層之下表面側配備有邊緣照明 式（側光式）、直下式等之背光單元。該邊緣照明式之背 光單元20通常如圖5所示，配備有作為光源之燈2丨、以端 部沿著該燈2 1之方式而配置的方形板狀之導光板22、及積 層於該導光板22之表面側的光學單元23。作為光源之燈 21 係使用 LED (Light-Emitting Diode，發光二極體）或冷 陰極管等，就小型化及節能化之觀點等而言，目前普遍使 用LED。該光學單元23具備重疊多片之光學片材，對透敏 201113561 光線具有擴散、折射等光學功能。作為該光學單元23所具 備之光學片材，可使用（1)配設於導光板22之表面側、 主要具有光擴散功能之光擴散片材24,或（2)配設於光擴 散片材24之表面側、具有朝法線方向側之折射功能之稜鏡 片材25等。 又，雖未圖示，但考慮到上述導光板22之導光特性或 光學單元23所具備之光學片材之光學功能等，而亦有更多 地配設有光擴散片材或稜鏡片材等光學片材之光學單元 23 ° . 作為具有此種背光單元之液晶顯示裝置，有汽車導航 系統所使用者。該汽車導航系統用液晶顯示裝置通常係設 ，於汽車之駕駛座與副駕駛座之間的中控台上。因此，該 汽車導航系統用液晶顯示裝置要求與個人電腦等其他液晶 ^示裳置不同之光學性能，，汽車導航用液晶顯示裝置 要未較廣之視角，以可與正面相比自傾斜方向，即從駕駛 f及副駕駛座更合適地觀看液晶畫面。為了因應此種要 :’例如亦開發出了具備如下光學單元之背光單元％，即， ，6所不’使作為光學片材之2片棱鏡片材之突條棱鏡 太且將棱鏡設置成朝内（導光板方向）（例如參照曰 本專利特開2〇〇1-195913號公報等）。 :該背光單元30之功能加以說明，首先，自燈Η入 片^光板”之光線，經導光板32背面之反射點或反射 自及各侧面而反射，•導光板32表面出射。 面出-…射之光線入射至稜鏡片材34,經折射而自表 。然後’自稜鏡片材34表面出射之光線入射至稜鏡 201113561 片材35,藉由形成於表面之多個突條稜鏡部而 方向廣泛擴散之分佈的光線出射。如此， 马朝左右 ^ ^ 先月,J之、、I直道 糸統之液晶顯示裝置用之背光單元3〇中，自 ，早導航 光線藉由光學單元33而擴散，朝左右方 ^ 出射之 式折射，進而照明上方之未圖示之液晶層整個面。 然而’根據此種光學單元33，如圖4夕国* 。 1 rtCL - , t 圖表中比較例 1所不，由於2片棱鏡片材34及35之朝傾斜方向 過高，故正面亮度下降，若自正面觀看汽車 十 曰·*· τ* 子瓶糸統之液 曰曰旦面，則產生畫面變暗之不良狀況。 [先前技術文獻] [專利文獻] 專利文獻1曰本專利特開2001-195913號公報 【發明内容】 [發明所欲解決之問題] 本發明有蓉於上述不良狀況，其目的在於提供一種朝 法線方向側之折射及廣角度之光擴散等光學功能較高、並 且可容易且確實地控制該光學功能之光學單元及使用該 光學單元而促進正面方向之高亮度化、廣視角化、亮度之 均勻化等品質之提昇的背光單元。 [解決問題之手段] 為了解決上述問題而研發出之發明係一種光學單元， 其具備微透鏡片材及配設於該微透鏡片材之表面側之 棱鏡片材， s亥微透鏡片材於背面具有由多個微透鏡所構成之微锋 201113561 鏡陣列， 棱鏡片材於表面具有由多個犬條棱鏡部所接丄 w攝成之突起 列。 該光學單元除了稜鏡片材以外，具備發揮 贫異之光學 功能之微透鏡片材，故朝法線方向側之折射、库& ~角度之光 擴散等光學功能格外提昇。又，微透鏡片材於背 & 、月面具有微 透鏡陣列’由此光擴散功能提昇，該光學單元之面均勺^生 格外提昇。 上述微透鏡片材t之微透鏡之平均直徑較伟泛 干又I玉马 1 0 " m 以上' 200 e m以下。微透鏡片材具備具有此種範圍之平均 直徑之微透鏡，由此可容易且確實地控制光學功处 》, u υ予初旎，該光 學單元之面均勻性提昇。 上述微透鏡片材中之微透鏡之直徑之變異係數較佳為 3 0%以上、1 〇〇%以下。如此般微透鏡之直徑具有_定範圍 之分佈，由此廣角度之光擴散功能進一步提昇，可實現背 光早元之廣視角化。 構成上述微透鏡片材中之微透鏡陣列的素材之折射率 較佳為1.3以上、ΐ·8以下。構成微透鏡陣列之素材具有上 述折射率，藉此能以廣角度而均勻地進行微透鏡陣列中之 光線的朝法線方向之折射及光擴散。 較佳為使用聚碳酸酯系樹脂作為上述微透鏡片材之形 成材料。微透鏡片材將聚碳酸酯系樹脂作為形成材料，由 此可容易且確實地成形上述特定形狀之微透鏡，故光學功 月色之控制可容易且確實地進行，並且由於具有適當之折射 率及較高之透射率’故正面亮度提高且可實現廣角度之光 201113561 擴散。 上述微透鏡片材之微透锫睡 适鏡陣列中之微透鏡之配設圖幸 較佳為隨機圖案。根據且有轮猫站- 一有此種隨機圖案之該光學單元， 可於將該微透鏡片材與其他井風 、/、他九干構件重合時減少疊紋之 生’並且提高光擴散性。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical unit suitable for a liquid crystal display device having excellent surface uniformity and a wide viewing angle, particularly a backlight unit of a liquid crystal display device for a car navigation system. And a backlight unit using the optical unit. [Prior Art] A liquid crystal display device is widely used as a screen for a television or a personal computer, and the 'page display device' is roughly divided into a direct view display of the face and a view of the shirt on the screen. Shadow. The direct-view liquid crystal display device has a transmissive type that transmits light of a backlight, a reflection type that does not have a backlight, and uses reflected light such as natural light or an indoor lamp, and a transmissive type that is reflective in a bright place and transmissive in a dark place. formula. On the other hand, in the projection type liquid crystal display device, there is a rear projection type in which a screen is projected on the front surface of the screen, and a screen is incorporated into the display cabinet to reflect the image. Nowadays, a direct-view type, in which a transmissive liquid crystal display device is used as a mainstream, is commonly used. In the transmissive liquid crystal display device, the moonlight mode for illuminating the liquid crystal layer from the back surface is popular, and the backlight unit of the edge illumination type (sidelight type) or direct type is provided on the lower surface side of the liquid crystal layer. The edge-lit backlight unit 20 is generally provided with a lamp 2 as a light source, a square plate-shaped light guide plate 22 disposed at an end portion along the lamp 2 1 , and laminated thereon. The optical unit 23 on the surface side of the light guide plate 22. As a light source lamp, an LED (Light-Emitting Diode) or a cold cathode tube is used. In terms of miniaturization and energy saving, LEDs are currently widely used. The optical unit 23 is provided with an optical sheet in which a plurality of sheets are stacked, and has optical functions such as diffusion and refraction for the light-sensitive 201113561 light. As the optical sheet provided in the optical unit 23, (1) a light-diffusing sheet 24 disposed on the surface side of the light guide plate 22, mainly having a light diffusing function, or (2) disposed on the light-diffusing sheet can be used. The surface side of 24, the ruthenium sheet 25 having a refractive function toward the normal side, and the like. Further, although not shown, in consideration of the light guiding characteristics of the light guide plate 22 or the optical function of the optical sheet provided in the optical unit 23, a light diffusion sheet or a ruthenium sheet is more often disposed. The optical unit of the optical sheet 23 °. As a liquid crystal display device having such a backlight unit, there is a user of a car navigation system. The liquid crystal display device for the car navigation system is usually provided on the center console between the driver's seat and the passenger's seat of the automobile. Therefore, the liquid crystal display device for the car navigation system requires different optical performances from other liquid crystal displays such as a personal computer, and the liquid crystal display device for car navigation does not have a wide viewing angle, so that it can be inclined from the front side. That is, the liquid crystal screen is more appropriately viewed from the driving f and the passenger seat. In order to cope with this, 'for example, a backlight unit % having the following optical unit has been developed, that is, 6 does not make the prism prism of the two prism sheets as an optical sheet too and sets the prism toward The inside (light guide plate direction) (for example, refer to Japanese Patent Laid-Open Publication No. Hei No. Hei No. Hei. No. Hei. The function of the backlight unit 30 is described. First, the light from the lamp into the film plate is reflected by the reflection point or reflection from the back surface of the light guide plate 32, and the surface of the light guide plate 32 is emitted. The light emitted from the incident light is incident on the enamel sheet 34, and is self-reflected by refraction. Then, the light emitted from the surface of the self-twisting sheet 34 is incident on the 35201113561 sheet 35 by a plurality of ridge portions formed on the surface. The light of the distribution which is widely diffused in the direction is emitted. Thus, the horses are left and right ^ ^ The first month, the backlight unit 3 of the liquid crystal display device of the J, I, and I straight channels, since the early navigation light is passed by the optical unit 33 Diffusion, refracting toward the left and right sides, and then illuminating the entire surface of the liquid crystal layer (not shown) above. However, according to this optical unit 33, as shown in Fig. 4, rtCL - , t is in the comparative example 1 No, since the tilting directions of the two prism sheets 34 and 35 are too high, the front brightness is lowered, and if the liquid surface of the car tenth·*· τ* sub-bottle is viewed from the front, a picture is generated. Bad condition of darkening. [Previous technical literature [Patent Document] Patent Document 1 JP-A-2001-195913 SUMMARY OF INVENTION [Problems to be Solved by the Invention] The present invention has been made in view of the above-described disadvantages, and an object thereof is to provide a side toward the normal direction. An optical unit having high optical function such as light refraction and wide-angle light diffusion, and which can easily and surely control the optical function, and using the optical unit to promote high brightness in the front direction, wide viewing angle, and uniform brightness The present invention is an optical unit having a microlens sheet and a prism sheet disposed on the surface side of the microlens sheet, s The microlens sheet has a micro-mirror 201113561 mirror array composed of a plurality of microlenses on the back surface, and the prism sheet has a protrusion column formed by a plurality of dog strip prisms on the surface. In addition to the lens material, it has a microlens sheet that exhibits an optical function that is inferior to the optical fiber. Therefore, optical functions such as refraction toward the normal direction side and light diffusion of the library & angle are exceptional. Further, the microlens sheet has a microlens array on the back & the lunar surface, and thus the light diffusion function is enhanced, and the surface of the optical unit is additionally raised. The average of the microlenses of the above microlens sheet t The diameter is more general and dry and I Yuma 1 0 " m or more '200 em or less. The microlens sheet has a microlens having an average diameter of such a range, whereby the optical work can be easily and surely controlled, u The surface uniformity of the optical unit is improved by the initial stage. The coefficient of variation of the diameter of the microlens in the microlens sheet is preferably 30% or more and 1% or less. Thus, the diameter of the microlens has _ By setting the distribution of the range, the light diffusion function of the wide angle is further improved, and the wide viewing angle of the backlight can be realized. The refractive index of the material constituting the microlens array in the above microlens sheet is preferably 1.3 or more and ΐ·8 or less. The material constituting the microlens array has the above refractive index, whereby the refraction and light diffusion of the light in the microlens array in the normal direction can be uniformly performed at a wide angle. It is preferred to use a polycarbonate resin as a material for forming the above microlens sheet. Since the microlens sheet has a polycarbonate resin as a forming material, the microlens of the above specific shape can be easily and surely formed, so that the control of the optical power color can be easily and surely performed, and since it has an appropriate refractive index And higher transmittance', so the front brightness is improved and the wide angle light 201113561 can be diffused. The arrangement of the microlenses in the microlens apnea array of the above microlens sheet is preferably a random pattern. According to the same and there is a round cat station - the optical unit having such a random pattern, which can reduce the occurrence of the moiré when the microlens sheet is overlapped with other well winds, and/or his nine dry members, and improve the light diffusibility .
上述犬條棱鏡部較佳為：；：备I ^ 1土马—角柱狀，且將頂角呈泛圓狀 癌。如此般突條稜鏡部為二角 4 勹一角柱狀，且將其頂角呈泛圓狀 態’由此於突條稜鏡部表面，自 曰。茨九學早70朝法線方向出 射之光線之折射角減小，故可^ ^ ^ ^ ^ ^ ^ θ J日加朝法線方向之出射光之 量’從而使正面亮度提昇。 -為了解決上述問題而研發出之另—發明係一種液晶顯 不裝置用之背光單元，其係使由燈所發出之光線分散並引 導至表面側者’該液晶顯示裝置用之背光單元之特徵在於 具備導光板、配設於該導光板之側端面之燈、及配設於該 導光板之表面側之上述光學單^。該光學單元具有較高之 :法線方：之折射及廣角度之光擴散等光學功能，故可提 门忒背光單几之正面方向之高亮度化、廣視角化、亮度之 均勻化等品質。尤其，可實現廣視角化之該背光單元可合 適地用於大多情況下自傾斜方向觀看之汽車導航系統用液 日曰顯不裝置中。 、^所°胃「微透鏡」，係指界面為部分球面狀之微 、、彳i如半球狀凸透鏡、半球狀凹透鏡等相當於該微 ^鏡，又，作為與「突條稜鏡部」之條方向垂直的方向之 口J面形狀’並無特別限定，除了直角三角形等三角形以外， 例如包括四角形、五角形等各種多角形或波形等。所謂「释 201113561 碳酸酯系樹脂」，係指主鏈上具有碳酸酯鍵（_〇_R_〇_c〇_) 之聚合物（polymer)。進而，所謂各片材之「表面」，係 指背光單元中具備該光學單元時光線出射之側的一面。 又，所謂各片材之「背面」，係指另一方的光線入射之側 的面。所謂微透鏡之直徑之「變異係數」，係以直徑之標 準偏差除以平均直徑所得之值來定義。 [發明之效果] 如以上所說明，根據本發明之光學單元，朝法線方向 側之折射及廣角度之光擴散等光學功能格外高，並且可容 易且確實地控制該光學功能，根據使用該光學單元之背光 單70，可使正面方向之高亮度化 ' 廣視角化、亮度之均勻 化專品質提昇。 【實施方式】 以下，一邊適當參照圖式一邊對本發明之實施形態加 以詳細說明。 圖1之光學單兀1具備微透鏡片材2及稜鏡片材3作 為光學片材，於微透鏡片材2之表面侧配設有稜鏡片材3。 微透鏡片材2如圖2所示，具備片椅狀之基材層[及 該基材層4之背面所具有之微透鏡陣列5。 基材層4由於必須使光線透射，故係由透明、特別； 無色透明之合成樹脂所形成。作為被用作該基材層4之男 成材料的合成樹脂，並無特別限定，例如可列舉聚對笨: 甲二乙一 g曰本萘一甲酸乙二酯 '丙烯酸系樹脂' 聚碳酉 S曰系樹月曰 '聚本乙烯、聚烯烴、纖維素乙酸酯、耐候性 201113561 乙烯、活性能量線硬化型樹脂等。其中，特佳為於微透鏡 陣列5之成形性優異之紫外線硬化型樹脂、電子束硬化型 樹脂等活性能量線硬化型樹脂或透明性及強度優異之聚碳 酸醋系樹脂。又，亦較佳為使用聚對苯二曱酸乙二酯膜、 聚萘二甲酸乙二酯膜或聚碳酸酯系樹脂膜作為基材層4，並 於其上以紫外線硬化性樹脂等而形成微透鏡6。 作為形成基材層4之聚碳酸酯系樹脂，較佳為含有直 鍵聚碳酸酯系樹脂及/或分支聚碳酸酯系樹脂之聚碳酸酯系 樹脂°作為本發明中所使用之直鏈聚碳酸酯系樹脂及分支 聚碳酸酿系樹脂，並無特別限定，可使用通常所用者。再 者，亦可僅由直鏈聚碳酸酯系樹脂、或僅由分支聚碳酸酯 系樹脂而形成基材層4。 直鍵聚碳酸醋系樹脂係藉由公知之光氣法或熔融法而 製造的直鏈之芳香族聚碳酸酯系樹脂，係由碳酸酯成分與 雙酚成分所形成。作為用以導入碳酸酯成分之前驅物質， 例如可列舉光氣、碳酸二苯酯等。又，作為雙酚，例如可 歹J舉.4,4-一羥基_2,2’-二苯基丙烷、2,2-雙（4-羥基苯基）丙 燒2’2-雙（3,5_二曱基-4-經基苯基）丙烧、1，丨_雙（4_經基苯 基）環己烷、U-雙（3,5_二曱基_4_羥基苯基）環己烷、^―雙 (&基笨基）癸烧、1，‘雙（4-經基苯基）丙烧、1，卜雙（4-經基 苯基）環癸烧、U-雙（3,5·二曱基_4_經基苯基）環十二烧、4 4_ 二羥基二苯基醚、4,4-硫代雙酚、4,4·二羥基_3,3_二氣二苯 趑4,4 一羥基_2,5-二羥基二苯基醚等。該等可單獨或組 合使用兩種以上。 分支聚碳酸酯系樹脂係使用分支劑而製造之聚碳酸酯Preferably, the dog strip prism portion is:; I I 1 horse-corner column shape, and the apex angle is a pan-shaped cancer. The ridges of the ridges are in the shape of a column of four corners, and the apex angle of the ridges is in a pan-round state, which is the surface of the ridges of the ridges. The angle of refraction of the light emitted by the normal direction of the 70th and the early morning is reduced, so that ^ ^ ^ ^ ^ ^ ^ θ J is added to the amount of light emitted in the direction of the normal direction, thereby increasing the front brightness. In order to solve the above problems, another invention is a backlight unit for a liquid crystal display device, which is characterized in that a light emitted from a lamp is dispersed and guided to a surface side of the backlight unit for the liquid crystal display device. A light guide plate, a lamp disposed on a side end surface of the light guide plate, and the optical unit disposed on a surface side of the light guide plate. The optical unit has a higher optical function such as normal line: refraction and wide-angle light diffusion, so that the brightness of the front side of the door backlight can be increased, the viewing angle is wide, and the brightness is uniformized. . In particular, the backlight unit which can realize a wide viewing angle can be suitably used in a liquid crystal display device for a car navigation system which is viewed from a tilt direction in most cases. The "microlens" of the stomach means that the interface is partially spherical, and the 彳i such as a hemispherical convex lens or a hemispherical concave lens corresponds to the micromirror, and is also used as the "burr". The shape of the J-face of the mouth in the direction perpendicular to the direction of the strip is not particularly limited, and includes, for example, a variety of polygons such as a square or a pentagon, or a waveform, in addition to a triangle such as a right triangle. The "release 201113561 carbonate resin" refers to a polymer having a carbonate bond (_〇_R_〇_c〇_) in the main chain. Further, the "surface" of each sheet refers to the side on the side where the light is emitted when the optical unit is provided in the backlight unit. Further, the "back surface" of each sheet refers to the surface on the side where the other light is incident. The "coefficient of variation" of the diameter of the microlens is defined by dividing the standard deviation of the diameter by the average diameter. [Effects of the Invention] As described above, according to the optical unit of the present invention, optical functions such as refraction toward the normal direction side and wide-angle light diffusion are extremely high, and the optical function can be easily and surely controlled, depending on the use. The backlight unit 70 of the optical unit can increase the brightness in the front direction. The wide viewing angle and the uniformity of brightness are improved. [Embodiment] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The optical unit 1 of Fig. 1 is provided with a microlens sheet 2 and a sheet 3 as an optical sheet, and a sheet 3 is disposed on the surface side of the microlens sheet 2. As shown in Fig. 2, the microlens sheet 2 includes a substrate layer in the form of a chair and a microlens array 5 which are provided on the back surface of the base layer 4. Since the base material layer 4 must transmit light, it is formed of a transparent, special colorless transparent synthetic resin. The synthetic resin to be used as the male material of the base material layer 4 is not particularly limited, and for example, polypyrene is exemplified: methyldiethyl-g-butyl naphthalene-ethylene natrile ester 'acrylic resin' polycarboquinone S曰系树月曰 'polyethylene, polyolefin, cellulose acetate, weather resistance 201113561 ethylene, active energy ray-hardening resin. In particular, an active energy ray-curable resin such as an ultraviolet curable resin or an electron beam curable resin which is excellent in moldability of the microlens array 5, or a polycarbonate vinegar resin excellent in transparency and strength is preferable. Further, it is also preferred to use a polyethylene terephthalate film, a polyethylene naphthalate film or a polycarbonate resin film as the base material layer 4, and an ultraviolet curable resin or the like thereon. A microlens 6 is formed. The polycarbonate resin forming the base material layer 4 is preferably a polycarbonate resin containing a direct bond polycarbonate resin and/or a branched polycarbonate resin as a linear polycondensation used in the present invention. The carbonate-based resin and the branched polycarbonate-based resin are not particularly limited, and those which are generally used can be used. Further, the base material layer 4 may be formed only of a linear polycarbonate resin or a branched polycarbonate resin. The direct-chain polycarbonate-based resin is a linear aromatic polycarbonate-based resin produced by a known phosgene method or a melting method, and is formed of a carbonate component and a bisphenol component. Examples of the precursor for introducing the carbonate component include phosgene and diphenyl carbonate. Further, as the bisphenol, for example, 4,4-hydroxyl-2,2'-diphenylpropane, 2,2-bis(4-hydroxyphenyl)propane 2'2-double (3) can be used. ,5-dimercapto-4-phenylphenyl)propane, 1,indole-bis(4-diphenyl)cyclohexane, U-bis(3,5-diindenyl-4-hydroxybenzene Base) cyclohexane, bis (& phenyl) oxime, 1, 'bis(4-phenylphenyl)propane, 1, bis (4-phenylphenyl) oxime, U-bis(3,5·didecyl_4_carbylphenyl)cyclododecan, 4 4_dihydroxydiphenyl ether, 4,4-thiobisphenol, 4,4·dihydroxy-3 , 3_ di-dibenzoquinone 4,4-hydroxy-2,5-dihydroxydiphenyl ether, and the like. These may be used alone or in combination of two or more. Branched polycarbonate resin is a polycarbonate produced by using a branching agent
L 201113561 系樹脂，分支劑例如可列舉：氟甘胺酸、偏苯三曱酸、丨，^-三（4-羥基苯基）乙烷、U，2•三（4_羥基苯基）乙烷、M，2_三 (4-羥基苯基）丙烷、1,13-2(4-羥基苯基）甲烷、丨丄卜三（4_ 羥基苯基）乙烷、1，1，1-三（4-羥基苯基）丙烷、丨’丨’丨三（2甲 基-4-羥基苯基）甲烷、i，u_:(2_甲基_4_羥基苯基）乙烷、 1，1，1-二（3-甲基-4-羥基苯基）甲烷、Hi•三（3_甲基_4_羥基 苯基）乙烷、1，1，1-三（3,5-二甲基_4·羥基苯基）甲烷、 三（3,5-二甲基-4-羥基苯基）乙烷、丨丄丨·三（3_氣·4羥基苯基） 曱烷、1，1，1-二（3-氣-4-羥基苯基）乙烷、三（3,5·二氯-4_ 羥基苯基）甲烷、1，1，1-三（3,5-二氯-4-羥基苯基）乙烷、1,1，1_ 三（3-溴-4-羥基苯基）曱烷、i，u_三（3_溴_4_羥基苯基）乙 炫、1，1，1 -二（3,5-二 >臭-4-經基苯基）曱烧、1，1,1 _三（3，5_二溴 -4-羥基苯基）乙烷等。 此種刀支t奴酸酿糸樹脂例如可如日本專利特願平 1 - 3 2 1 5 5 2號公報所記載般，藉由以下方法而製造：對於芳 香族雙酚類、上述分支劑及由光氣所衍生之聚碳酸酯低聚 物、芳香族雙酚類及末端終止劑，以包含該等化合物之反 應混合液成為紊流之方式一邊攪拌一邊進行反應，於反應 合液之黏度上升之時刻’添加驗性水溶液並且使反應混 合液進行層流而反應。本發明之樹脂組成物之分支聚碳酸 酯系樹脂係以5〜80質量％之範圍而含於聚碳酸酯系樹脂 中，較佳為10〜60質量％之範圍。其原因在於，若分支聚 碳酸酯系樹脂小於1 〇質量％，則伸長黏度下降而擠壓成形 時之成形變困難，若超過80質量％，則樹脂之剪斷黏度變 高而成形加工性下降。 10 201113561 基材層4之厚度（平均厚度）並無特別限定 1〇…上、5〇°…下，較佳為35…上二為 以下，特佳為50ym以上、18 〇/Zm 危， 8//m以下。若基材層4之屋 二易：上述範圍’則會發生於背光單元等中暴露於熱下時 谷易產生勉曲、使用變固難等不良狀況，反之，若基材下層： 之厚度超過上述範圍，則有時液晶顯示裝置之亮度下降， 又，背光單元之厚度變大而與 求相背離。 ，、液“員不裝置之薄型化之要 微透鏡陣列5係由多數之微透鏡6所構成。該微透鏡6 二球狀（包括近似於半球之形狀）等使光折射而 二 學曲面形狀體，且設置於基材層4之背面。 ❹透鏡6由於必須使光線透射，故係由透明，特別是益 色透明之合成樹脂所形成’具體而言係使用與上述基材層4 相同之合成樹脂。其中，特伟 , 寻佳為透明性、強度優異且具有 適當之折射率之聚碳酸酯系樹脂。 ” 再者’微透鏡6不限定於上述半球狀凸透鏡，亦可為 +球狀凹透鏡之微透鏡。該半球狀凹透鏡之微透鏡亦盘上 Μ透鏡6同樣地具有優異之光學功能。再者’構成微透 鏡陣列5之微透鏡6不限定於相同形狀及尺寸者。又，微 透鏡陣列5不限定於僅由半球狀凸透鏡、或僅由半球狀凹 透鏡構成，亦可由半球狀凸透鏡與半隸凹 種微透鏡所構成。 寺夕 基材層4及微透鏡6中’除了上述合成樹脂以外，例 如亦y調配填料、塑化劑、穩定劑、抗劣化劑、分散劑等。 微透鏡6係相對較密集且隨機地配設於基材層4之心… 201113561 面。根據該隨機圖宏 „ .. _ _ 谡圖案，可於將該微透鏡片材2與其他 構件重合時減少叠& .，，之產生並且使光擴散性提昇，從而 -以廣角度來進行均句之光線之出射。 微透鏡6之平均直徑（D 為 r哏权佳為1 # m，特佳 為30//m，進而特佳為 直庐…夕μ 另方面，微透鏡6之平均 上限較佳為200㈣，特佳為15〇心，進而特 佳為100" m。若微读< 卫 ' 右U透鏡6之平均直徑（D)小於 則繞射之影響變大，容易 β 導致。質下降， 能之下降或色分離， 导欽口口貝下降。另—方 万面右微透鏡6之平均直徑（D)超 過200 y m，則容易發 τ收 生厚度之增大或売度不均，導致品質 卜降0 微透鏡6之直徑之轡里係盔+ τ 4, ^ ^之受呉係數之下限較佳為30%， 上限較佳為賴’特佳為咖。如此般微透 2 I (D)具有上述範圍之特定之變異係數，即且有 ::之：佈’由此可使入射至微透鏡片材之光線以廣角而 夕古π / η、 回7 J r生徒幵。又，若微透鏡ό y , , ^ I 吸則可能喪失微透鏡 月材2之背面之平滑性，導 等九線透射率之下降。此處， 所明直控（D )之「變在·^ « 伞μ t異係數」’係以直徑之標準偏差除以 千均直彳空所得之值來定義。 微透鏡6之表面粗链度（Ra)之下限較佳為〇〇一， 之為〇/03^。另—方面，微透鏡6之表面粗链度（Ra) 、泰执 肖㈣Q’Q7//m。藉由如此般將微 远鏡6之表面粗糙度（R ) ^ μ ^ J °又疋為上述下限以上，該微透 見材2之微透鏡陣列$之成形性變棍 、取π丨王交仵相對較容易，而減 12 201113561 輕製造方面之技術性負擔及成本負擔。另一方面藉由將 微透鏡6之表面粗糙度（Ra)設定為小於上述上限，微透 鏡6表面之光之散射減少，結果可提高微透鏡6的朝法線 方向侧之折射功能或光擴散功能，由於該良好之光學功能 而可貝現正面方向之高亮度化及出射光之均勻化。 Μ透鏡6之平均高度（η )相對於平均曲率半徑（R ) 之高度比（H/R)之下限較佳為5/8，特佳為3/4。另一方面， 。亥冋度比（H/R)之上限較佳為丨· 3。藉由如此般將微透鏡6 之尚度比（H/R)設定為上述範圍，可有效發揮微透鏡^之 透鏡折射作用，該微透鏡片材2之聚光等光學功能格外提 昇0 微透鏡6之平均透鏡間距離（s; p—D)相對於平均直 徑（D )之間隔比（s/D )之上限較佳為1/2，特佳為Μ。 藉由如此般將微透鏡6之平均透鏡間距離（s )設定為上述 上限以下，而減少無助於光學功能之平坦部，該微透鏡片 材2之聚光等光學功能格外提昇。 微透鏡6之填充率之下限較佳為4〇%，特佳為6〇%。 藉由如此般將微透鏡6之填充率設定為上述下限以上，而 提高微透#； 6之佔有面積，該微透鏡片材2之光擴散功能 等光學功能格外提昇。再者，所謂該微透鏡之填充率，係 指每特定之單位面積的所有微透鏡所佔之比例。 構成微透鏡陣列5之素材之折射率之下限較佳為1 3， 特佳為1.45,另一方面，該素材之折射率之上限較佳為n 特佳為1.6。該範圍中，構成微透鏡陣列5之素材之折射率 最佳為1.5。藉由如此般將構成微透鏡陣列5之素材之折郝 13 201113561 率又定為上述範圍，而有效發揮微透鏡6之透鏡折射作用， 該微透鏡片材2之光擴散等光學功能進__步提昇。 作為該微透鏡片材2之製造方法，只要可形成上述構 造者則並無特別限定’可採用各種方法。作為該微透鏡片 材2之製造方法，可採用製作基材層4後另形成微透鏡陣 列5之方法、將基材層4與微透鏡陣列5 一體成形之方法， 具體而言有： (a )於具有微透鏡陣列5之反轉形狀之片材模具上積 層合成樹脂，將該片材模具剝離而形成該微透鏡片材2之 方法； (b) 於具有微透鏡陣列$之反轉形狀之金屬模具中注 入熔融樹脂之射出成型法； (c) 將片材化之樹脂再次加熱並夾在與上述相同之金 屬模具與金屬板之間’進行壓製而轉印形狀之方法； (d) 於周面上具有微透鏡陣列5之反轉形狀的親模具 與其他辕之報隙（nip )間通過熔融狀態之樹脂，轉印上述 形狀並進行擠壓的片材成形法； (e )於基材層上塗佈紫外線硬化型樹脂，壓抵於與上 述相同之具有反轉形狀之片材模具、金屬模具或輥模具而 對未硬化之紫外線硬化型樹脂轉印形狀，照射紫外線而使 紫外線硬化型樹脂硬化之方法； (f)對與上述相同之具有反轉形狀之金屬模具或輥模 具填充塗佈未硬化之紫外線硬化性樹脂，以基材層壓抵並 整平’照射紫外線而使紫外線硬化型樹脂硬化之方法； (g )自微細之喷嘴朝片材基材上射出或喷出未硬化 14 201113561 (液狀）之紫外線硬化型樹脂等，並使其硬化之方法，·及 (h)代替紫外線硬化型樹脂而使用電子束硬化型樹脂 之方法等。 作為上述具有微透鏡陣列5之反轉形狀的模具（⑷ :方法，例如可藉由以下方式來製造··於基材上藉由 敎：：科而形成斑點狀之立體圖案，使該立體圖案藉由加 透為曲面’藉此製作微透鏡陣列模型，於該微 兄 』之表面錯由電鑄法而積層金屬層’將該金屬 :到離。又’作為上述微透鏡陣列模型之製作方法，亦可 知用上述（g )所記載之方法。 作為上述具有微透鏡陣列5之反轉形狀的模 表：等）之其他製造方法，可藉由以下方式來製造：使用 八有微透鏡陣列形狀之光學片材原版，藉由擠心 。法於先學片材原版之表面積層模具用合成樹 / 具用合成樹脂層將光學片材原版剥離。擠屢層：二自模 佳為藉由夾層擠虔層合法於光學片材原版與模 ，特 材之間積層模具用合成樹脂層。 …、土材片 根據上述製造方法，可藉由擠塵層合法 面上具有微透鏡陣列形狀之光學片材原版之表^印表 可生產性佳地製造光擴散功能等光學性能 ％狀，故 材。特別是根據夾層擠壓層合法，藉由模具用：先學片 確保光學片材形成模具之強度，可著重於光學^才片材而 表面形狀之轉印性或耐熱性、模具用合成樹原版之 用合成樹脂層之剝離性等而選定構成模具用八曰〜光學層 合成樹脂，有助於所生產之光學片 口成樹月旨層之 片材的表面形狀之精密賦… 15 201113561 型性或光學片材形成模具之長壽命化β 又’根據上述利用擠壓層合法之製造方法，具有由具 備隨機之直徑的多個微透鏡6所構成的背面之微透鏡陣列5 之反轉形狀的模具例如亦可藉由以下方式而容易地製造： 將藉由塗佈具有多種直徑之珠粒而形成之光擴散片材作為 原版並進行轉印等。 根據上述製造方法，可容易且確實地形成任意形狀之 微透鏡陣列5。因此，可容易且確實地調整構成微透鏡陣列 5之微透鏡6之直徑（D )、高度比（H/R ) '間隔比（S/D )、 填充率等，其結果，可容易且確實地控制該微透鏡片材2 之光學功能。 該微透鏡片材2藉由微透鏡陣列5而具有較高之光擴 散等光學功能，並且可容易且確實地控制該光學功能。因 此，該微透鏡片材2可將朝向稜鏡片材3之入射光線之波 峰方向控制為最適於朝法線方向側之折射的傾斜角。 再者，微透鏡片材2亦可於表面（與稜鏡片材3接觸 之面）具有抗黏附層。藉由具備該抗黏附層， 鏡片材2與稜鏡片材3之黏附。 … 抗黏附層係由黏合劑及分散於該黏合劑中之珠粒所構 成。該黏合劑係藉由使含有基材聚合物之聚合物組成物硬 化而形成。藉由該黏合劑而將珠粒大致等密度地配置固定 於基材層之表面。再者，該抗黏附層之厚纟（珠粒除外： 黏合劑部分之厚度）並無特別限定，例如可設 Ρ、1Λ A M m Μ 以下之程度。 上述基材聚合物並無特別限定，例如 J幻舉.丙烯酸 201113561 系樹脂、聚胺基甲酸醋、聚醋、氣系樹脂、聚石夕氧系樹脂、 聚酿胺醯亞胺、環氧樹脂、紫外線硬化型樹脂等，該等聚 合物可使用-種或混合使用兩種以上。特別是作為上述基 材聚合物，較佳為加工性較高、可利用塗佈等方法而容易 地形成抗黏附層之多元醇…黏合劑所用之基材聚合物 由於必須使光線透射，故係設定為透明，特佳為無色透明。 上述多元醇例如較佳為（a)於經基過剩之條件下獲得 之聚酿多元醇、⑴將含有含經基之不飽和單體之單體成 分聚合所得且具有（甲基）丙烯酿基單元等之丙稀酸系多元 醇。將該聚醋多元醇或丙晞酸系多元醇作為基材聚合物之 黏合劑係耐候性較高，可抑制抗黏附層之黃變等。再者， 該聚酯多元醇與丙烯酸系多元醇可使用任一方，亦可使用 兩方。 再者用以形成黏合劑之聚合物組成物中除了基材聚 合物以外，例如可適當調配微小無機填充劑、硬化劑、塑 化劑、分散劑、各種勻化劑、抗靜電劑、紫外線吸收劑' 抗氧化劑、黏性改質劑、潤滑劑、光穩定劑等。 作為珠粒之材料’大致分為無機填料與有機填料。作 為無機填料，具體可使用二氧化矽、氫氧化鋁、氧化鋁' 氧化鋅、硫化鋇、矽酸鎂或該等之混合物。作為有機填料 之具體材料，可使用丙烯酸系樹脂、丙烯腈樹脂、聚胺基 甲酸酯、聚氣乙烯 '聚苯乙烯、聚丙烯腈、聚醯胺等。其 中，較佳為透明性較高、不妨礙光線之透射之丙烯酸系樹 脂’特佳為聚甲基丙烯酸甲酯（PMMA，p〇lymethyl methacrylate) 〇 17 201113561 珠粒之平均粒杈之下限較佳為i ^ m，特佳為2 ^爪，進 而特佳為5心’該平均粒徑之上限較佳為5〇 ”特佳為 2〇 // m ’進而特佳& 15 " m。若珠粒之平均粒徑小於上述下 限’則可能藉由珠粒而形成之抗黏附層之表面之凸部變 :’無法獲得充分之抗黏附效果，反之，#珠粒之平均粒 位超過上述上限，則可能微透鏡片材之厚度增大，且有對 责面側重合之其他光學構件造成損傷之虞。 a若將該珠粒之調配量設定為相對較少之量，則珠粒彼 此逖：而分散於黏合劑中，A多數珠粒係其下端自黏合劑 極二里地大出。因此，若將該微透鏡片材與導光板積層， 則大出之珠粒之下端抵接於導光板等之表面，而並非微透 鏡片材之背面之整個面與導光板等抵接。#此防止微透鏡 片材與導光板等之黏附’抑制液晶顯示裝置之晝面之亮度 不均。 作為該抗黏附層之形成方法，例如包括以下步驟：（& ) 藉由在構成黏合劑之聚合物組成物中混合珠粒而製造抗黏 附層用塗佈液；及（b )藉由將該抗黏附層用塗佈液塗佈於 基材層4之背面而積層抗黏附層。 再者，仏黏附層不限定於上述構成（由黏合劑及分散 於該黏合劑中之珠粒所構成）及形成方法，亦可藉由利用 /、基材層4之一體成形的對表面之糙面加工而設置。藉由 矛J用此種一體成形而形成抗黏附層，可縮短製造步驟，從 而可於工業上進行量產。 棱鏡片材3具備片材狀之基材層7、及於該基材層7之 表面的由夕個突條棱鏡部8所構成之突起列。為了防止將 18 201113561 多片的片材重疊時所產生之疊紋’該由多個突條棱鏡部8 所構成之突起列較佳為並非完全平行及等間隔地形成，而 以錯開之間隔來形成突條稜鏡部8。該稜鏡片材3藉由表面 上具備之由多個突條稜鏡部8所構成之突起列，而具有較 高之朝法線方向側之折射功能及廣角度之光擴散功能。： 者，基材層7與上述微透鏡片材2之基材層4相同。 犬條衩鏡部8由於必須使光線透射，故係由透明、 別是無色透明之合成樹脂所形成，具體而言係使用與上 基材層4相同之合成樹脂。又，與上述微透鏡陣列$相同 構成突條稜鏡部8之素材之折射率之下限較佳為Μ，特 為1.45，其上限較佳為18，特佳為16。 突條棱鏡部8係—個側面與基材層7表面接觸之二 柱狀者。與突條稜鏡部8之條方向垂直的方向之剖面： 較佳為頂角U9G。、底角α45。之直角等腰三角形，; 頂角9呈泛圓狀態。藉由如此般使得突條棱鏡部8之頂 呈泛圓狀態，自該光學單元1朝 早几1朝法線方向出射之光線之4 :角：小2可使朝正面方向之出射光之量增加，從^ ^ 非垂直地入射至該稜鏡片材 之光線藉由突條稜鏡部8而以瘩&娘Λ 向之亮度。 巾以廣角擴散，故可提高傾斜1 大你校L 201113561 is a resin, and examples of the branching agent include fluoroglycine, trimellitic acid, hydrazine, tris(4-hydroxyphenyl)ethane, U, 2•tris(4-hydroxyphenyl)B. Alkane, M, 2_tris(4-hydroxyphenyl)propane, 1,13-2(4-hydroxyphenyl)methane, tris(4-hydroxyphenyl)ethane, 1,1,1-three (4-hydroxyphenyl)propane, 丨'丨' 丨 tris(2methyl-4-hydroxyphenyl)methane, i, u_: (2-methyl-4-hydroxyphenyl)ethane, 1,1 , 1-bis(3-methyl-4-hydroxyphenyl)methane, Hi•tris(3-methyl-4-hydroxyphenyl)ethane, 1,1,1-tris(3,5-dimethyl _4·hydroxyphenyl)methane, tris(3,5-dimethyl-4-hydroxyphenyl)ethane, ruthenium tris(3_a)-4-hydroxyphenyl)decane, 1,1 , 1-bis(3-a-4-hydroxyphenyl)ethane, tris(3,5·dichloro-4_hydroxyphenyl)methane, 1,1,1-tris(3,5-dichloro-4 -Hydroxyphenyl)ethane, 1,1,1_tris(3-bromo-4-hydroxyphenyl)decane, i, u_tris(3_bromo-4-hydroxyphenyl)ethyl, 1,1 , 1-di(3,5-di> odor-4-phenylphenyl) oxime, 1,1,1 _tris (3,5-dibromo-4- Phenyl) ethane and the like. Such a knives can be produced, for example, as described in Japanese Patent Application No. Hei 1 - 3 2 1 5 5 2, for the production of aromatic bisphenols, the above-mentioned branching agents, and the like. The polycarbonate oligomer, the aromatic bisphenol, and the terminal terminator derived from phosgene are reacted while stirring in a reaction mixture containing the compounds, and the viscosity of the reaction mixture rises. At the time of 'adding an aqueous solution and reacting the reaction mixture by laminar flow. The branched polycarbonate resin of the resin composition of the present invention is contained in the polycarbonate resin in an amount of from 5 to 80% by mass, preferably from 10 to 60% by mass. When the branched polycarbonate resin is less than 1% by mass, the elongational viscosity is lowered and the molding at the time of extrusion molding becomes difficult. When the amount is more than 80% by mass, the shear viscosity of the resin is increased and the formability is lowered. . 10 201113561 The thickness (average thickness) of the base material layer 4 is not particularly limited to 1 〇...upper, 5 〇°..., preferably 35...the upper two is the following, particularly preferably 50 ym or more, 18 〇/Zm, 8 //m below. If the substrate layer 4 is easy to use: the above range 'will occur when the backlight unit or the like is exposed to heat, the valley is liable to be distorted, and the use of the solidification is difficult. Otherwise, if the thickness of the lower layer of the substrate exceeds In the above range, the brightness of the liquid crystal display device may be lowered, and the thickness of the backlight unit may be increased to deviate from the phase. The microlens array 5 is composed of a plurality of microlenses 6. The microlenses 6 are two-spherical (including a shape similar to a hemisphere) and the like, and the light is refracted to form a curved surface shape. The body is disposed on the back surface of the base material layer 4. Since the ❹ lens 6 must transmit light, it is formed of a transparent, in particular, transparent synthetic resin. Specifically, the same as the above-mentioned base material layer 4 is used. Among them, Tewei is a polycarbonate resin which is excellent in transparency and strength and has an appropriate refractive index. Further, the microlens 6 is not limited to the above-described hemispherical convex lens, and may be +spherical. A microlens of a concave lens. The microlens of the hemispherical concave lens also has an excellent optical function as the upper lens 6 of the disk. Further, the microlenses 6 constituting the microlens array 5 are not limited to the same shape and size. Further, the microlens array 5 is not limited to a hemispherical convex lens alone or a hemispherical concave lens, and may be composed of a hemispherical convex lens and a semi-recessed microlens. In the base layer 4 and the microlens 6 of the temple, in addition to the above-mentioned synthetic resin, for example, a filler, a plasticizer, a stabilizer, an anti-deterioration agent, a dispersing agent and the like are also formulated. The microlenses 6 are relatively densely and randomly disposed on the center of the substrate layer 4... 201113561. According to the random pattern macro „.. _ _ 谡 pattern, when the lenticular sheet 2 is overlapped with other members, the stacking and grading can be reduced, and the light diffusibility can be improved, thereby performing at a wide angle. The average diameter of the microlens 6 (D is the best value of r 哏 为 1 1 m, especially preferably 30 / / m, and then especially for the straight 庐 ... 夕 μ other aspects, the average of the microlens 6 The upper limit is preferably 200 (four), particularly preferably 15 cents, and particularly preferably 100 " m. If the average diameter (D) of the micro-reading < wei' right U lens 6 is smaller, the influence of the diffraction becomes larger, and it is easy to cause β The quality is decreased, the energy is decreased or the color is separated, and the mouth of the guide is lowered. The average diameter (D) of the right-side microlens 6 is more than 200 ym, which is easy to increase or increase the thickness of the τ. Unevenness, resulting in a quality drop of 0. The diameter of the microlens 6 is the helmet + τ 4, ^ ^ The lower limit of the acceptance coefficient is preferably 30%, and the upper limit is better than Lai's special coffee. 2 I (D) has a specific coefficient of variation of the above range, that is, and there is:: cloth: thus the light incident on the microlens sheet can be The angle 而 古 π / η, back 7 J r 幵 幵 又 又 又 又 若 若 若 若 若 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 又 y y y y y y y y y y y Here, the "change in ^^ « umbrella μ t different coefficient" of the direct control (D) is defined by dividing the standard deviation of the diameter by the value of the thousand mean straight hollow. The surface of the microlens 6 is thick. The lower limit of the degree (Ra) is preferably 〇〇1, which is 〇/03^. On the other hand, the surface of the microlens 6 has a thick chain (Ra) and a Tatschau (four) Q'Q7//m. When the surface roughness (R ) ^ μ ^ J ° of the micro-lens 6 is further reduced to the above lower limit, the micro-lens array of the micro-transparent material 2 has a forming property of a stick, and it is relatively easy to take a π- 丨 仵 仵 仵And minus 12 201113561 technical burden and cost burden on the light manufacturing side. On the other hand, by setting the surface roughness (Ra) of the microlens 6 to be smaller than the above upper limit, the scattering of light on the surface of the microlens 6 is reduced, and the result is Increasing the refractive function or the light diffusing function of the microlens 6 toward the normal direction side, due to the good optical function, the front side can be The luminance and the uniformity of the emitted light. The lower limit of the height ratio (H/R) of the average height (η) of the pupil lens 6 with respect to the average radius of curvature (R) is preferably 5/8, particularly preferably 3/4. On the other hand, the upper limit of the haze ratio (H/R) is preferably 丨·3. By setting the ratio (H/R) of the microlens 6 to the above range, the microlens can be effectively utilized. ^The lens refraction, the optical function of the condensing sheet of the lenticular sheet 2 is exceptionally enhanced. The ratio of the average inter-lens distance (s; p-D) to the average diameter (D) of the microlens 6 is (s/D). The upper limit of the upper limit is preferably 1/2, which is particularly good. By setting the average inter-lens distance (s) of the microlens 6 to the above-described upper limit or less, the flat portion that does not contribute to the optical function is reduced, and the optical function such as the condensing of the lenticular sheet 2 is particularly enhanced. The lower limit of the filling ratio of the microlens 6 is preferably 4% by weight, particularly preferably 6% by weight. By setting the filling ratio of the microlens 6 to the above lower limit or more, the area occupied by the micro-transparent #6 is increased, and the optical function such as the light diffusing function of the microlens sheet 2 is particularly enhanced. Further, the filling rate of the microlens refers to the ratio of all the microlenses per specific unit area. The lower limit of the refractive index of the material constituting the microlens array 5 is preferably 1 3 and particularly preferably 1.45. On the other hand, the upper limit of the refractive index of the material is preferably n. In this range, the refractive index of the material constituting the microlens array 5 is preferably 1.5. By setting the ratio of the material of the microlens array 5 to the above range, the lens refraction of the microlens 6 is effectively exerted, and the optical function such as light diffusion of the microlens sheet 2 is __ Step up. The method for producing the microlens sheet 2 is not particularly limited as long as the above-described structure can be formed. Various methods can be employed. As a method of manufacturing the microlens sheet 2, a method of forming the base layer 4 and then forming the microlens array 5, and a method of integrally forming the base layer 4 and the microlens array 5 may be employed. Specifically, there are: a method of laminating a synthetic resin on a sheet mold having an inverted shape of the microlens array 5, peeling the sheet mold to form the microlens sheet 2; (b) having an inverted shape of the microlens array $ (In) a method of injecting a molten resin into a metal mold; (c) a method of reheating the sheet-formed resin and sandwiching it between the same metal mold and the metal plate as described above; a sheet forming method in which a mold having a reverse shape of the microlens array 5 on the circumferential surface and a nip of another crucible pass through a resin in a molten state, and the shape is transferred and extruded; (e) The base material layer is coated with an ultraviolet curable resin, and is pressed against a sheet mold, a metal mold, or a roll mold having the same reverse shape as described above, and is transferred to an uncured ultraviolet curable resin, and irradiated with ultraviolet rays to cause ultraviolet rays. Hardened type a method of hardening a resin; (f) filling and coating an unhardened ultraviolet curable resin with a metal mold or a roll mold having an inverted shape as described above, and laminating and flattening the substrate to irradiate ultraviolet rays to harden ultraviolet rays. Method for hardening a resin; (g) a method of ejecting or ejecting an ultraviolet curable resin which has not been hardened to a sheet substrate from a fine nozzle to a sheet substrate, and hardening it, and (h) A method of using an electron beam curing resin instead of the ultraviolet curable resin. As the mold having the inverted shape of the microlens array 5 ((4): the method can be manufactured, for example, by forming a speckled three-dimensional pattern on a substrate by a 敎::, and making the three-dimensional pattern By adding a transparent surface to the curved surface 'by making a microlens array model, the surface of the micro-brother is laminated by electroforming to laminate the metal layer 'the metal: away from the same.' as the manufacturing method of the above microlens array model It is also known that the method described in the above (g) is used. Another manufacturing method of the above-described mold having the inverted shape of the microlens array 5: (etc.) can be manufactured by using an eight-microlens array shape. The original sheet of optical sheet, by squeezing the heart. The method is to first learn the sheet of the original surface layer of the mold for the surface of the composite tree / with the synthetic resin layer to peel off the original sheet of optical sheet. Extrusion layer: two self-modes are preferably laminated with a synthetic resin layer between the optical sheet original and the mold and the special material by sandwiching the layer. According to the above-described manufacturing method, the optical property such as the light diffusion function can be produced with good productivity by the surface of the original sheet of the optical sheet having the shape of the microlens array on the dust-pressing layer. material. In particular, according to the interlayer extrusion lamination method, by using the mold: first learning the film to ensure the strength of the optical sheet forming the mold, the emphasis can be placed on the optical shape of the sheet and the transferability or heat resistance of the surface shape, the synthetic tree original for the mold By using the peeling property of the synthetic resin layer or the like, it is selected to form a gossip-optical layer synthetic resin for the mold, which contributes to the precision of the surface shape of the sheet of the produced optical sheet into a tree layer. 15 201113561 Type or optical The long life of the sheet forming mold is β. According to the above-described manufacturing method using the extrusion lamination method, a mold having an inverted shape of the microlens array 5 having a back surface composed of a plurality of microlenses 6 having a random diameter is used, for example. It can also be easily manufactured by applying a light-diffusing sheet formed by coating beads having various diameters as a master and transferring it or the like. According to the above manufacturing method, the microlens array 5 of any shape can be easily and surely formed. Therefore, the diameter (D), the height ratio (H/R)' spacing ratio (S/D), the filling ratio, and the like of the microlens 6 constituting the microlens array 5 can be easily and surely adjusted, and as a result, it can be easily and surely obtained. The optical function of the lenticular sheet 2 is controlled. The microlens sheet 2 has an optical function such as high light diffusion by the microlens array 5, and the optical function can be easily and surely controlled. Therefore, the microlens sheet 2 can control the peak direction of the incident light toward the sheet 3 to be an inclination angle most suitable for the refraction toward the normal direction side. Further, the lenticular sheet 2 may have an anti-adhesion layer on the surface (the side in contact with the enamel sheet 3). By having the anti-adhesion layer, the lens material 2 adheres to the enamel sheet 3. The anti-adhesion layer is composed of a binder and beads dispersed in the binder. The binder is formed by hardening a polymer composition containing a substrate polymer. The beads are disposed at substantially equal density on the surface of the substrate layer by the binder. Further, the thickness of the anti-adhesion layer (except for the bead portion: the thickness of the binder portion) is not particularly limited, and may be, for example, Ρ, 1 Λ A M m Μ or less. The substrate polymer is not particularly limited, and is, for example, J Magic. Acrylic 201113561 resin, polyurethane vinegar, polyester, gas resin, polyoxo resin, polyacrylamide, epoxy resin The ultraviolet curable resin or the like may be used alone or in combination of two or more kinds. In particular, as the base polymer, a polyol having a high workability and being easily formed into an anti-adhesion layer by a method such as coating is preferably used. The base polymer used for the adhesive must transmit light. Set to transparent, especially good for colorless and transparent. The above polyol is preferably, for example, (a) a polystyrene polyol obtained under conditions of excess radicals, (1) a monomer component containing a radical group-containing unsaturated monomer, and having a (meth)acrylic acid group. An acrylic acid such as a unit. The binder of the polyester polyol or the propionic acid polyol as the base polymer has high weather resistance, and can suppress yellowing of the anti-adhesion layer. Further, the polyester polyol and the acrylic polyol may be used alone or in combination. Further, in addition to the base polymer, the polymer composition for forming the binder may be, for example, a fine inorganic filler, a hardener, a plasticizer, a dispersant, various homogenizers, an antistatic agent, and ultraviolet absorption. Agent 'antioxidants, viscous modifiers, lubricants, light stabilizers, etc. The material as a bead is roughly classified into an inorganic filler and an organic filler. As the inorganic filler, specifically, cerium oxide, aluminum hydroxide, aluminum oxide 'zinc oxide, cerium sulfide, magnesium ruthenate or a mixture thereof can be used. As a specific material of the organic filler, an acrylic resin, an acrylonitrile resin, a polyurethane, a polyethylene terephthalate, a polyacrylonitrile, a polyamide or the like can be used. Among them, the acrylic resin which is preferably transparent and does not hinder the transmission of light is particularly preferably a polymethyl methacrylate (PMMA) 〇17 201113561. The lower limit of the average particle size of the beads is preferably It is i ^ m, particularly preferably 2 ^ claws, and particularly preferably 5 cores. The upper limit of the average particle diameter is preferably 5 〇", particularly preferably 2 〇 / / m ' and then particularly good & 15 " m. If the average particle diameter of the beads is less than the above lower limit', the convex portion of the surface of the anti-adhesion layer formed by the beads may be changed: 'The sufficient anti-adhesion effect cannot be obtained, and conversely, the average grain position of the # beads exceeds the above The upper limit may increase the thickness of the microlens sheet and cause damage to other optical members that coincide with the side of the face. a. If the amount of the beads is set to a relatively small amount, the beads are mutually逖: dispersed in the binder, A majority of the beads are at the lower end of the self-adhesive agent. Therefore, if the lenticular sheet is laminated with the light guide plate, the lower end of the larger bead is abutted. On the surface of the light guide plate, etc., not the entire back side of the microlens sheet The surface is in contact with the light guide plate, etc. #This prevents the adhesion of the microlens sheet to the light guide plate or the like, and suppresses unevenness in brightness of the surface of the liquid crystal display device. As a method of forming the anti-adhesion layer, for example, the following steps are included: ;) a coating liquid for an anti-adhesion layer is produced by mixing beads in a polymer composition constituting a binder; and (b) coating the substrate layer 4 with the coating liquid for an anti-adhesion layer; The anti-adhesion layer is laminated on the back side. Further, the anti-adhesive layer is not limited to the above-described composition (composed of a binder and beads dispersed in the binder) and a forming method, and the substrate layer 4 may be utilized by One of the body-formed surfaces is processed by roughening the surface. By integrally forming the spear J to form an anti-adhesion layer, the manufacturing process can be shortened, and the mass production can be performed industrially. The prism sheet 3 has a sheet shape. The base layer 7 and the protrusion row formed by the ridge protrusion prism portion 8 on the surface of the base material layer 7. In order to prevent the occurrence of the overlap of the 18 201113561 multiple sheets of sheets The protrusion row formed by the plurality of ridge prism portions 8 is preferably Formed completely parallel and at equal intervals, and the ridges 8 are formed at staggered intervals. The enamel sheet 3 has a protrusion row composed of a plurality of ridges 8 on the surface. The higher refractive index function on the normal side and the wide-angle light diffusion function: The base material layer 7 is the same as the base material layer 4 of the above-described microlens sheet 2. The dog frog mirror portion 8 must be made light The transmission is formed of a transparent, non-color-transparent synthetic resin, specifically, the same synthetic resin as the upper substrate layer 4. Further, the same as the above-described microlens array $ constitutes the ridge portion 8 The lower limit of the refractive index of the material is preferably Μ, specifically 1.45, and the upper limit thereof is preferably 18, and particularly preferably 16. The ridge prism portion 8 is a columnar body in which the side faces are in contact with the surface of the substrate layer 7. A cross section in a direction perpendicular to the direction of the strips of the ridges 8 is preferably a vertex angle U9G. , the bottom angle α45. The right angle is an isosceles triangle; the apex angle 9 is in a pan-round state. By thus causing the top of the ridge prism portion 8 to be in a pan-round state, the light emitted from the optical unit 1 toward the normal direction by a few degrees 1: angle: the small 2 can make the amount of light emitted toward the front direction Increasing, the light incident from the ^^ non-perpendicular to the enamel sheet is illuminated by the ridges 8 of the ridges. The towel spreads at a wide angle, so it can increase the inclination of your school.
—IBJ 特Μ 馬厌、之下限較佳為1〇# 、為30_，另一方面，上述寬度（w)之上限較程 =二:佳為400_。其原因在於，若突 =面之見度（W)小於上述下限’則突條種鏡部8之形 困難，反之’若突條棱鏡部8之底面之寬度（w) 19 201113561 上限，則有產生眩光、亮度不均等之虞。 頂角9之曲率半徑相對於突條稜鏡部8之底面之寬度 (W)之比（曲率半徑比）的下限較佳為⑽〇,特佳為1/30。 另-方面’曲率半徑比之上限較佳為1/2，特佳為Μ。其 原因在於’若頂角9之曲率半徑比小於上述下限，則朝法 線方向出射之光線之折射角的減小較小，i面亮度下降， 反之’右曲率半徑比大於上述上限，貝4可能稜鏡片材之光 學功能 '特別是光擴散功能下降，朝廣角度之光擴散性下 降。 該稜鏡片材3之製造方法只要可形成上述構造者則並 無特別限定，可採用製作基封層7後另形成突條禮鏡部8 之方法、將基材層7與突條稜鏡部8 一體成形之方法且 體而言有： ~ (a )於具有稜鏡片材3表面之反轉形狀之片材模具上 積層合成樹脂，將該片材模具剝離而形成該稜鏡片材3之 方法； b)於具有稜鏡月材3表面之反轉形狀之金屬模具中 注入炼融樹脂之射出成型法； (c )將片材化之樹脂再次加熱並夾在與上述相同之金 屬核具與金屬板之間，進行壓製而轉印形狀之方法； )於周面上具有稜鏡片材3表面之反轉形狀的輕模 具與其他輥之輥隙間通過熔融狀態之樹脂，轉印上述形狀 並進行擠壓之片材成形法； (e )於基材層上塗佈紫外線硬化型樹脂，壓抵於與上 v δ之具有反轉形狀之片材模具、金屬模具或輕模具而— IBJ Features The lower limit of the horse is preferably 1〇#, which is 30_. On the other hand, the upper limit of the width (w) is equal to two: preferably 400_. The reason is that if the protrusion degree (W) is smaller than the lower limit ', the shape of the protrusion type mirror portion 8 is difficult, and if the width of the bottom surface of the protrusion prism portion 8 (w) 19 201113561 is the upper limit, there is It produces glare and uneven brightness. The lower limit of the ratio of the radius of curvature of the apex angle 9 to the width (W) of the bottom surface of the ridge portion 8 (the radius of curvature ratio) is preferably (10) 〇, particularly preferably 1/30. Further, the upper limit of the radius of curvature ratio is preferably 1/2, and particularly preferably Μ. The reason is that if the radius of curvature ratio of the apex angle 9 is smaller than the lower limit, the decrease of the refraction angle of the light emitted toward the normal direction is small, and the luminance of the i plane is decreased, whereas the ratio of the right curvature radius is greater than the upper limit. It is possible that the optical function of the sheet is reduced, in particular, the light diffusion function is lowered, and the light diffusibility toward a wide angle is lowered. The method for producing the enamel sheet 3 is not particularly limited as long as the above-described structure can be formed, and a method of forming the slat mask portion 8 after the base seal layer 7 is formed, and the base layer 7 and the ridge portion can be formed. 8 The method of integrally forming and having the body: ~ (a) a method of laminating a synthetic resin on a sheet mold having an inverted shape of the surface of the enamel sheet 3, and peeling the sheet mold to form the enamel sheet 3 b) injection molding method for injecting a refining resin into a metal mold having a reversed shape of the surface of the lunar material 3; (c) reheating the sheet-formed resin and sandwiching it with the same metal fixture as described above a method of pressing and transferring a shape between metal plates; a light mold having a reversed shape of the surface of the enamel sheet 3 on the circumferential surface and a nip of the other rolls are passed through a resin in a molten state, and the shape is transferred and carried out Extrusion sheet forming method; (e) coating an ultraviolet curable resin on a substrate layer, and pressing against a sheet mold, a metal mold or a light mold having an inverted shape with respect to v δ
20 201113561 對未硬化之紫外線硬化型樹脂轉印形狀，照射紫外線而使 紫外線硬化型樹脂硬化之方法； ⑴對與上述相同之具妓轉形狀之金屬才莫具或輕模 具填充塗佈未硬化之紫外線硬化性樹脂，以基材層壓抵並 弄平整，Μ射紫外線而使紫外線硬化型樹脂硬化之方法； 及 (g )代替紫外線硬化型樹脂而使用電子束硬化型樹脂 之方法等。 /光單元1藉由考面上具有微透鏡陣列5之微透鏡 片材2提升廣角度之光擴散等光學功能，藉由稜鏡片材3 提升朝法線方向側之折射，故藉由將該2片的片材組合， 可實現正面亮度較高且具有廣視角之光學單元。進而，藉 由調整微透鏡之平均直徑或直徑之變異係數等，可容易且 確實地控制光學功能，故可進一步提高光學單元之正面亮 度及朝廣角之光擴散性。 圖3所示之邊緣照明式背光單元1〇具備導光板u及 配設於該導光板11之側端面之燈12，於該導光板u之表 面側重疊配設有該光學單元1。此時，以配設有燈12之導 光板11之側端面與光學單S i中之突條棱鏡部8成平行的 方式配設。 作為導光板11 ’可使用公知者。導光板u之厚度（平 均厚度）亚無特別限定，例如係設定為i 〇〇 " m以上、丨〇 以下’較佳為設定為lmm以上、8麵以下。若導光板u 之厚度小於上述範圍，則可能發生背光單元之亮度下降等 不良狀况’又’可能無法耐受汽車内等使用環境條件。珥 21 201113561 ::當導光板u之厚度超過上述範圍時，亦同樣地有時液 =示裝置之亮度下降’又，背光單元1〇之厚度變大而與 液Ba顯示裝置之薄型化之要求相背離。 ，12’可使用通常之背光單元中所用之公知者， 較仏為使用LED(發光二極體）。藉由使用咖 可節能且容易地獲得高亮度，又 乍為且 Λ1 „ J身兄月先早元10之薄 型化。 對二燈12所發出、自導光板11表面出射之光線具有相 對：法線方向而傾斜特定角度的相對較強之波峰，但該背 光早7L 1G藉由具有較高之光擴散功能等、特別是且有較高 之朝法線方向侧之變角功能等的該光學單& i而可提高正 面冗度’且廣角度地擴散出射光…匕，根據該背光單元 10 ’可轉保較高之正面亮度且廣角度地確保該較高之亮 度，故可獲得廣視角及較高之亮度之面均勻性。 具體而言，根據該背光單* 1〇,若相對於法線方向之 Μ (正面亮度）而左右4(Γ方向之亮度為9()%以上、合適 的是95。/❶以上’且自正面而左右4〇β(共8〇。）之亮度差（亮 度之最大值與最小值之差）為㈣以下、合適的是5%以下， 則發揮極高之出射光之面均勻性。 再者，作Α邊緣照明式背光單元，不僅有以配設有燈 丨2之導光板U之側端面與光學單元！中之突條稜鏡部8成 平行的方式配設之情形’亦有以成垂直之方式配設之情 形。又，亦有將多個燈12配設於導光板u之兩個以上之 側端面的情形。 [實施例]20 201113561 A method of curing an ultraviolet curable resin by irradiating ultraviolet rays with respect to an unhardened ultraviolet curable resin transfer shape; (1) a metal having a twisted shape as described above or a light mold filling coating is not hardened The ultraviolet curable resin is a method in which a base material is laminated and flattened, and ultraviolet rays are irradiated to cure the ultraviolet curable resin; and (g) a method in which an electron beam curable resin is used instead of the ultraviolet curable resin. The optical unit 1 enhances the optical function such as light diffusion at a wide angle by the microlens sheet 2 having the microlens array 5 on the test surface, and by licking the sheet 3 to refract toward the normal side, The combination of two sheets enables an optical unit with a high front brightness and a wide viewing angle. Further, by adjusting the coefficient of variation of the average diameter or diameter of the microlenses, the optical function can be easily and surely controlled, so that the front luminance of the optical unit and the light diffusibility toward the wide angle can be further improved. The edge-lit backlight unit 1 shown in Fig. 3 includes a light guide plate u and a lamp 12 disposed on the side end surface of the light guide plate 11, and the optical unit 1 is placed on the surface side of the light guide plate u. At this time, the side end faces of the light guide plates 11 on which the lamps 12 are disposed are arranged in parallel with the ridge prism portions 8 in the optical sheets Si. A known one can be used as the light guide plate 11'. The thickness (average thickness) of the light guide plate u is not particularly limited, and is, for example, set to i 〇〇 " m or more, 丨〇 or less, preferably set to be 1 mm or more and 8 or less. If the thickness of the light guide plate u is smaller than the above range, a problem such as a decrease in brightness of the backlight unit may occur, and the environmental conditions such as use in the automobile may not be tolerated.珥21 201113561: When the thickness of the light guide plate u exceeds the above range, the liquid crystal = the brightness of the display device may decrease in the same way, and the thickness of the backlight unit 1 变 becomes larger and the liquid Ba display device is thinner. Deviate from each other. 12' can use a known one used in a usual backlight unit, and it is more suitable to use an LED (Light Emitting Diode). By using the coffee to save energy and easily obtaining high brightness, it is also thin and thin. The light emitted from the second lamp 12 and emitted from the surface of the light guide plate 11 has a relative: A relatively strong peak of a certain angle is inclined in the line direction, but the backlight is 7L 1G earlier by the optical single &erus having a higher light diffusion function, etc., and particularly a higher angle function toward the normal direction side. i can improve the frontal redundancy and spread the light out at a wide angle...匕, according to the backlight unit 10', the higher front brightness can be transferred and the higher brightness can be ensured at a wide angle, so that a wide viewing angle can be obtained. In particular, according to the backlight single *1〇, the left and right sides are 4 (the brightness in the Γ direction is 9 (%) or more, which is suitable for the 法 (front luminance) in the normal direction. It is 95./❶ or more and the difference in brightness (the difference between the maximum value and the minimum value of brightness) from the front side and the left and right sides of 4〇β (total 8〇) is (4) or less, and suitably 5% or less, it is extremely high. Uniformity of the surface of the emitted light. In addition, as the edge-lit backlight In addition, the case where the side end surface of the light guide plate U provided with the lamp cymbal 2 is arranged in parallel with the ridge portion 8 of the optical unit! is also arranged in a vertical manner. Further, there are cases where a plurality of lamps 12 are disposed on two or more side end faces of the light guide plate u. [Embodiment]
22 201113561 以下，根據貫施例對本發明加以詳述，但並非根據該 實施例之記載來限定性地解釋本發明。 <微透鏡片材之形成> 於具有微透鏡陣列之反轉形狀之片材模具上積層熔融 聚奴酸酯树月曰，將片材模具剝離，藉此形成微透鏡片材。 所形成之微透鏡片材係以平均厚度為i 00 A m、微透鏡之平 均直徑為60 μ m、微透鏡之直徑之變異係數為5〇%而形成。 <棱鏡片材之形成> 於具有棱鏡片材之反轉形狀之片材模具上積層熔融聚 奴酸酯樹脂，將片材模具剝離，藉此形成稜鏡片材。所形 成之稜鏡片材係以平均厚度為i 〇〇 # m、突條稜鏡部之底面 之寬度為100/zm而形成。 [實施例] 於厚度3 mm之導光板之側端面配置發光二極體作為光 源。於導光板之表面，以微透鏡陣列成為背面側（導光板 側）之方式配置上述微透鏡片材。於該微透鏡片材之表面， 以大條稜鏡部成為表面側、且突條稜鏡部與發光二極體之 配置邊成平行之方式配置上述稜鏡片材。於稜鏡片材之表 面配置擴散片材而製成實施例之背光單元（導光板/背面微 透鏡片材/表面稜鏡片材）。 [比較例1 ] 代替微透鏡片材，而以突條稜鏡部成為背面側、且另 一稜鏡片材與突條稜鏡部正交之方式配置稜鏡片材，除此 以外，與實施例同樣地製作比較例丨之背光單元（導光板/ 月面棱鏡片材/表面棱鏡片材）。 23 201113561 [比較例2 ] 代替微透鏡片材’而以突條稜鏡部成為表面側 '且另 —棱鏡片材與突條棱鏡部正交之方式配置稜鏡片材，除此 以外，與實施例同樣地製作比較例丨之背光單元（導“ 表面稜鏡片材/表面稜鏡片材）。 / [評價] 以背光單元之表面側法線方向為基準，於·8〇。〜⑽。 範圍内對實施例及比較例丨、2之背光單元之出射光之意= 進行測定。將其測定結果示於圖4中。如目4 ^ 例之背光單元於，。至40。的約8〇。之視角中顯示出均句： 度’可知亮度高且面均勾性非常優異。另—方面，比較例二 之背光單元雖然視角相對較廣，<旦包括 度：降二可知，吨例2及崎们之背 面党度較咼，但視角自正面偏離時亮度大幅度地下降。 [產業上之可利用性] 如上所述，本發明之光學單元及使用該光學單元之背 光單元可使由燈所發出之光線分散，並進行高亮度且具有 廣，角之均勻性較高之照射，可適用於液晶顯示裝置、特 別是直視式液晶顯示裝置、&而特別是透射式液晶顯示裝 置。又，作為其用途，特別適合用於需要廣視角之汽車導 航系統用液晶顯示裝置等。 【圖式簡單說明】 圖1係表示本發明之—實施形態之光學單A的示意性 剖面圖。The present invention will be described in detail below based on the examples, but the present invention is not limited by the description of the embodiments. <Formation of Microlens Sheet> A molten polystearate tree was laminated on a sheet mold having an inverted shape of a microlens array, and the sheet mold was peeled off, thereby forming a microlens sheet. The formed microlens sheet was formed by an average thickness of i 00 A m , an average diameter of the microlenses of 60 μm, and a coefficient of variation of the diameter of the microlens of 5 %. <Formation of Prism Sheet> A molten polyacrylate resin is laminated on a sheet mold having a reversed shape of a prism sheet, and the sheet mold is peeled off, thereby forming a sheet of a crucible. The formed sheet material was formed with an average thickness of i 〇〇 # m and a width of the bottom surface of the ridge portion of the ridge portion of 100/zm. [Examples] A light-emitting diode was disposed as a light source on the side end surface of a light guide plate having a thickness of 3 mm. The microlens sheeting is disposed on the surface of the light guide plate so that the microlens array becomes the back side (light guide plate side). On the surface of the lenticular sheet, the enamel sheet is placed such that the large ridge portion becomes the surface side and the ridge portion is arranged in parallel with the arrangement side of the light emitting diode. A diffusion sheet (light guide plate / back microlens sheet / surface tantalum sheet) of the example was prepared by disposing a diffusion sheet on the surface of the sheet. [Comparative Example 1] The ruthenium sheet was placed so that the ridge portion became the back side and the other gusset was orthogonal to the ridge portion instead of the microlens sheet. In the same manner, a backlight unit (light guide plate/moon prism sheet/surface prism sheet) of a comparative example was produced. 23 201113561 [Comparative Example 2] In place of the microlens sheeting, the enamel sheet is disposed such that the ridge portion becomes the front side and the prism sheet is orthogonal to the ridge prism portion, and In the same manner, a backlight unit of a comparative example (a "surface sheet/surface sheet") was produced in the same manner. [Evaluation] Based on the normal direction of the surface side of the backlight unit, it is in the range of 8 〇. (10). The measurement results of the light emitted from the backlight units of the examples and the comparative examples 2 and 2 were measured. The measurement results are shown in Fig. 4. The backlight unit of the example 4 is about 8 Å to 40. In the perspective of the view, the average sentence is displayed: Degree 'can be seen that the brightness is high and the surface is very excellent. On the other hand, the backlight unit of Comparative Example 2 has a relatively wide viewing angle, and the degree of inclusion includes: 2, 2 The backs of the Kawasaki are more awkward, but the brightness is greatly reduced when the angle of view deviates from the front. [Industrial Applicability] As described above, the optical unit of the present invention and the backlight unit using the same can be The light from the lamp is scattered and highlighted The invention has the advantages of wide illumination and high uniformity of angle, and is applicable to liquid crystal display devices, particularly direct-view liquid crystal display devices, and particularly transmissive liquid crystal display devices. Further, as its use, it is particularly suitable for use in needs. A liquid crystal display device for a car navigation system having a wide viewing angle, etc. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing an optical single A according to an embodiment of the present invention.
24 201113561 圖2係表示圖1之光學單元所具備之微透鏡片材的局 部仰視圖。 圖3係表示具備圖1之光學單元之背光單元的示意性 立體圖。 圖4係表示相對於視角之背光之亮度的圖表。 圖5係表示先前之通常之邊緣照明式背光單元的示意 性立體圖。 圖6係表示汽車導航系統用液晶顯示裝置中所用之先 前之背光單元的示意性立體圖。 【主要元件符號說明】 1 光學單元 2 微透鏡片材 3 稜鏡片材 4 基材層 5 微透鏡陣列 6 微透鏡 7 基材層 8 突條稜鏡部 9 頂角 10 背光單元 11 導光板 12 燈 20 背光單元 21 燈 Γ 25 導光板 光學單元 光擴散片材 棱鏡片材 背光單元 燈 導光板 光學單元 棱鏡片材 棱鏡片材 直徑 高度 曲率半徑 透鏡間距離 寬度 頂角 底角 2624 201113561 Fig. 2 is a partial bottom plan view showing a microlens sheeting of the optical unit of Fig. 1. Fig. 3 is a schematic perspective view showing a backlight unit including the optical unit of Fig. 1. Figure 4 is a graph showing the brightness of a backlight relative to a viewing angle. Fig. 5 is a schematic perspective view showing a conventional conventional edge-lit backlight unit. Fig. 6 is a schematic perspective view showing a prior backlight unit used in a liquid crystal display device for a car navigation system. [Description of main component symbols] 1 Optical unit 2 Microlens sheet 3 稜鏡 Sheet 4 Substrate layer 5 Microlens array 6 Microlens 7 Substrate layer 8 Bump 9 9 Top corner 10 Backlight unit 11 Light guide plate 12 Lamp 20 backlight unit 21 lamp 导 25 light guide plate optical unit light diffusing sheet prism sheet backlight unit lamp light guide plate optical unit prism sheet prism sheet diameter height curvature radius lens distance width apex angle bottom angle 26