201128235 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種複合光控制板、面光源裝置及透過型 圖像顯示裝置。 【先前技術】 例如圖5所示’作為直下式圖像顯示裝置（1 〇 8 )，係廣泛 使用埠過型圖像顯示部（109)之背面側配置有光源（1〇7) 者。作為透過型圖像顯示部（109)，可列舉例如於液晶單元 (191)之兩面配置有直線偏光板〇92、192)之液晶顯示面 板。作為光源（107) ’係以相互平行之方式配置使用複數個 如直管型之冷陰極射線管等之線狀光源。 作為如此之直下式圖像顯示裝置（108)，較理想的是可 使來自光源（107)之光均勻地分散且均勻地對透過型圖像顯 示部（109)進行照明，因此，於光源（1〇7)與透過型圖像顯 不部（109)之間，配置使用一片具有改變自光源（1〇7)側入 射之光的方向，而使該光自相反侧之透過型像顯示部（1〇9) 側出射之功能的光控制板（101)[專利文獻丨：日本專利特開 平7-198913號公報]。 近年來，以節能之觀點考慮，而就使用發光二極體作為 光源’以代替直管型冷陰極射線管不斷進行研究。發光二 極體通常為點狀光源，且其離散性配置使用。 先前技術文獻 專利文獻 [專利文獻1 ]曰本專利特開平7_丨989丨3號公報 150084.doc 201128235 【發明内容】 [發明所欲解決之問題] 然而’先則之偏向構造板’若與如發光二極體之點狀光 源組合，用於直下式圖像顯示裝置，則存在無法使來自點 狀光源之光充分均勻，使得藉由透過型圖像顯示部而顯示 之圖像中，有明亮度於點狀光源之附近、及遠離點狀光源 之位置處不同之問題。 因此，本發明者為開發使來自點狀光源之光充分均勻地 分散’從而可均勻地照明透過型圖像顯示部之偏向構造板 而進行銳意研究，最終完成本發明。 [解決問題之技術手段] 亦即’本發明係提供一種複合光控制板，其係由自第1 面（11、21、31、41)入射之光可自位於與該第1面相反一側 之第2面（12、22、32、42)出射，且上述第2面（12 ' 22、 32、42)上形成有沿第1方向（XI1、X21、X3 1、X41)延伸 並且沿與該第1方向正交之第2方向（X12、X22、X32、 X42)並列配置之複數個凸狀部（13、23、33、43)的第工光 控制板（10)、第2光控制板（2〇)、第3光控制板（3〇)及第4光 控制板（40)以該順序相互重合而成，且，上述第丨光控制板 (10)及上述第3光控制板（3〇)係分別定義如下之光控制板， 上述第2光控制板（2〇)係第1方向（X21)平行於上述第1光控 制板之第1方向（XII)，且第1面（21)與第1光控制板（1〇)之 第2面（12)相對向’上述第3光控制板（30)係第1方向（X31) 與上述第1光控制板（1〇)之第！方向（χη)正交，且第1面 150084.doc 201128235 (31)與上述第2光控制板（20)之第2面（22)相對向，上述第4 光控·制板（40)係第1方向（X41)平行於上述第1光控制板（1〇) 之第1方向（XII)，且第1面（41)與上述第3光控制板（30)之 第2面（32)相對向。 光控制板.於上述凸狀部之與上述第1方向正交之剖面 上，將穿過該凸狀部之相對於上述第2方向之兩端的轴線 s史為X軸，將上述X軸上穿過上述兩端之中心且與上述X軸 正交之軸線設為z軸，將上述凸狀部之χ軸方向之長度設為BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite light control panel, a surface light source device, and a transmissive image display device. [Prior Art] For example, as the direct type image display device (1 〇 8 ) shown in Fig. 5, a light source (1〇7) is disposed on the back side of the smashed image display unit (109). The transmissive image display unit (109) is, for example, a liquid crystal display panel in which linear polarizing plates 〇92 and 192 are disposed on both surfaces of the liquid crystal cell (191). As the light source (107)', a linear light source using a plurality of cold cathode ray tubes such as a straight tube type is disposed in parallel with each other. As such a direct type image display device (108), it is preferable that the light from the light source (107) is uniformly dispersed and uniformly illuminates the transmissive image display portion (109), and therefore, the light source ( Between 7) and the transmissive image display portion (109), a direction in which the light incident from the side of the light source (1〇7) is changed is used, and the light is transmitted from the opposite side to the image display portion (1〇9) A light control panel (101) having a function of side emission [Patent Document No. 7-198913]. In recent years, in view of energy saving, the use of a light-emitting diode as a light source has been continuously conducted in place of a straight-tube type cold cathode ray tube. Light-emitting diodes are typically point-like sources and are used in discrete configurations. PRIOR ART DOCUMENT PATENT DOCUMENT [PATENT DOCUMENT 1] PCT Patent Laid-Open No. Hei 7-丨989 No. 3 Publication No. 150084.doc 201128235 [Summary of the Invention] [Problems to be Solved by the Invention] However, if the 'pre-existing structural plate' is For example, when a point light source combination of a light-emitting diode is used for a direct-type image display device, the light from the point light source cannot be sufficiently uniform, and the image displayed by the transmissive image display unit is clearly displayed. The brightness is different in the vicinity of the point source and at a position away from the point source. Therefore, the inventors of the present invention have made intensive studies to develop a deflecting structure in which the light from the point light source is sufficiently uniformly dispersed to uniformly illuminate the transmissive image display portion, and finally completed the present invention. [Technical means for solving the problem] That is, the present invention provides a composite light control panel in which light incident from the first surface (11, 21, 31, 41) can be located on the side opposite to the first surface The second surface (12, 22, 32, 42) is emitted, and the second surface (12' 22, 32, 42) is formed to extend along the first direction (XI1, X21, X3 1, X41) and along The light control panel (10) and the second light control of the plurality of convex portions (13, 23, 33, 43) in which the first direction is orthogonal to the second direction (X12, X22, X32, X42) The plate (2〇), the third light control plate (3〇), and the fourth light control plate (40) are mutually overlapped in this order, and the third light control panel (10) and the third light control panel (3〇) is defined as a light control panel, wherein the second light control panel (2〇) is in a first direction (X21) parallel to a first direction (XII) of the first light control panel, and the first surface (21) Facing the second surface (12) of the first light control panel (1) with respect to the third light control panel (30) in the first direction (X31) and the first light control panel (1) The first! The direction (χη) is orthogonal, and the first surface 150084.doc 201128235 (31) is opposed to the second surface (22) of the second light control plate (20), and the fourth light control plate (40) is The first direction (X41) is parallel to the first direction (XII) of the first light control panel (1), and the first surface (41) and the second surface (32) of the third light control panel (30) Relative. a light control plate. The axis s passing through the convex portion with respect to both ends of the second direction is an X-axis in a cross section perpendicular to the first direction of the convex portion, and the X-axis is The axis passing through the center of the both ends and orthogonal to the X-axis is defined as the z-axis, and the length of the convex portion in the x-axis direction is set to
Wa時， 於上述剖面上，上述凸 0.475wa^x^〇.475w.^· in xb 丄 凸狀部之輪廟形狀 之輪廓形狀於- &$ 0.475%之範圍中由滿足式⑴之ζ(χ)表示： [數1] 〇·95χζ〇(χ)<2(χ)<1.〇5χζ〇(χ)...(1) [於式（1)中’ ζ〇(χ)係由式（2)定義： [數2] z〇{x)=ha -In the case of Wa, on the above-mentioned cross section, the contour shape of the convex shape of the convex portion of the convex portion of the convex portion of the convex portion is in the range of - & $ 0.475% by satisfying the formula (1) (χ) means: [Number 1] 〇·95χζ〇(χ)<2(χ)<1.〇5χζ〇(χ)...(1) [in equation (1)' ζ〇(χ ) is defined by equation (2): [number 2] z〇{x)=ha -
ka為-1.0以上且未滿 (於式（2)中，1^為〇.25^^〜0.75 0)]。 [發明之效果] 根據本發明，可提供一 種可更穩定地抑制亮度不均之複 150084.doc 201128235 合光控制板、包含該複合光控制板之面光源裝置及透過型 畫像顯示裝置。 【實施方式】 [複合光控制板] 如圖1所示，本實施形態之複合光控制板（1)係由第1光 擴散板（第1光控制板）（10)、第2光擴散板（第2光控制 板）(20)、第3光擴散板（第3光控制板）(30)及第4光擴散板 (第4光控制板）(4〇)相互重合而成。該等第1光擴散板（1〇)、 第2光擴散板（20)、第3光擴散板（30)及第4光擴散板（40)之 重合順序為上述第1光擴散板（10)、第2光擴散板（20)、第3 光擴散板（30)、第4光擴散板（40)之順序。 [第1光擴散板] 第1光擴散板（10)係包括第1面（11)與第2面（12)。第2面 (12)係位於與第1面（u)相反一側之面。自第1面（u)入射之 光可自第2面（12)出射。 第1光擴散板（10)之第1面（11)通常為平坦面，且既可為 鏡面，亦可為遍及整面具有光擴散性之面。 於第2面（12)上形成有凸狀部（13)。該凸狀部（丨3)係沿第1 方向（XII)延伸者。該凸狀部（13)係複數個形成於第2面 (12)，且沿第2方向（X12)並列配置。第2方向（X1 2)係與第工 方向（XII)正交之方向。形成於第2面（12)上之複數個凸狀 部（13)之剖面形狀可於凸狀部（13)間大致相同，亦可組合 使用X軸方向之長度（Wa)不同之複數種凸狀部。 再者’第1光擴散板（1〇)之厚度（dl)係為自第1面（u)起至 150084.doc 201128235 凸狀部（13)之頂部為止之距離。第丨光擴散板（1〇)之厚度 (dl)係為例如〇·ι mm〜5 mm，且既可為膜狀亦可為片 狀，但通常為厚度（dl)l m m以上之片狀。 [凸狀部] 形成於第1光擴散板（1〇)之第2面（12)之凸狀部（13)係其輪 廓形狀由滿足上述式（1)之2〇〇表示。圖2中表示如此之Z 狀部（13)之剖面形狀之一例。該圖2係放大表示一個凸狀部 (13)。使用圖2所示之局部之χζ座標系統說明該凸狀部之形 狀於5亥χζ座標系統中，X軸係為複數個凸狀部（丨3)排列之 方向且平行於第2方向（χΐ2)之軸。ζ軸係為平行於光擴散 板（10)之厚度方向之軸，且與第！方向（Χ11)及第2方向 (Χ12)正交。於該χζ座標系統之χζ面中凸狀部（13)之剖面 形狀係兩鳊（13&、13a)位於χ軸上而頂部（1%)位於ζ軸 上。 凸狀部（13)之剖面形狀係具有與2軸對稱之輪廓線。該輪 廓線係於凸狀部（13)之乂軸方向之長度設為^時，於_ 0,475wasx$ 0.475Wa之範圍中，由滿足下述式（1)之2(5〇表 不 〇 [數3] 0·95χζ〇(χ)<2(χ)<ι.〇5χζ〇(χ) [於式（1)中’ ζ〇(χ)係由式（2)定義： 150084.doc 201128235 [數4] 8弋丄 ζ0(χ) = ha —-\w〇 ) …(。) u(+'Mj+紙㈤ V / (於式（2)中，ha為〇_25Wa〜0.75Wa，匕為]〇以上且未滿叫。 圖2係表示式⑴中規定z⑻之ζ〇(χ)中之^為〇⑵^且^ 為-0.400之情形。如上所述Wa為凸狀部〇3)之χ軸方向之長 度，1^與凸狀部（13)為由〜(“表示之形狀時之凸狀部（I]) 之兩端（13a、13a)之間之最大高度對應。 凸狀部（13 )之輪廓線如圖3所示，若對某一寬度％求出 z〇(x) ’則可為通過由0.95xz〇⑷表示之輪廓線與由 1 ·05 Xz〇(x)表示之輪廓線之間之區域的輪廓線。 凸狀部（13)之寬度Wa因凸狀部（13)易於形成，故通常為 40 μηι以上，較佳為250 μηι以上，且由於凸狀部（13)之紋 路肉眼難以辨識，故通常為800 μηι以下，較佳為45〇 μπια 下。作為寬度wa，具體而言’可例示Wa=41〇 μηι、Wa=4〇〇 μηι及wa=325 μηι，但wa值並不限定於該等。 凸狀部（13)係上述式（2)中之ha較佳為〇.4Wa〜0.7Wa，1^較 佳為-0.5以上。 作為113及ka，較佳為： (A) ha 為 〇.4825wa〜0.521wa 且]^為-〇.232〜-0.227、或者 ha 為 0.4852〜3〜0.521\¥3且]<;3為-〇.232〜-〇.227， (B) hA〇.5966wa〜0.6837wjkag-〇.〇75〜-0.069， 150084.doc •9- 201128235 (C)ha為 〇.525wa且 ka為-〇·4。 作為hAka由上述（Α)所示之凸狀部（13)之形狀，具體而 言，可列舉例如Ma=0.521Wa且ka=_〇 229所示之形狀、由 ha=0.521wa 且 ka=-0.227 所示之形狀、及由 ha=〇 4825ν^ 且 ka=-0.232所示之形狀。 作為由上述（B)所示之凸狀部（13)之形狀’具體而言，可 列舉例如由ha=0.5966wa且ka=-0.〇75所示之形狀 '及由 ha-0.6837wa且 ka=-0.069所示之形狀。 更佳為，第1光擴散板（1〇)係ha及、為上述（b)所示之範 圍。 [第2光擴散板] 第2光擴散板（20)係包括第1面（21)與第2面（22)。第2面 (22)係位於與第1面（2 1)相反一側之面。自第1面（2丨）入射之 光可自第2面（22)出射。 第2光擴散板（20)之第1面（21)係通常為平坦面，且既可 為鏡面，亦可為遍及整面具有光擴散性之面。 於第2光擴散.板（20)之第2面（22)上形成有凸狀部（23)。該 凸狀部（23)係沿第1方向（X21)延伸者。該凸狀部（23)係複 數個形成於第2面（22)，且沿第2方向（X22)並列配置。第2 方向（X22)係與第1方向（X2 1)正交之方向。形成於第2面 (22)上之複數個凸狀部（23)之剖面形狀可於凸狀部（23)間大 致相同，亦可組合使用X軸方向之長度（wa)不同之複數種凸 狀部。 再者，第2光擴散板（20)之厚度（d2)係為自第1面（21)起至 150084.doc -10· 201128235 凸狀部（23)之頂部為止之距離。第2光擴散板（2〇)係厚度 (d2)為例如〇.1 mm〜5 mm ’且既可為膜狀，亦可為片狀， 但通常為厚度（d2)未滿1 mm之膜狀。 形成於第2光擴散板（20)之第2面（22)之凸狀部（23)係其剖 面形狀可為例如等腰三角形，亦可為與作為第丨光擴散板 (10)中之凸狀部（13)所述者相同之形狀。 [第3光擴散板] 第3光擴散板（30)係包括第1面（3 1)與第2面（32)。.第2面 (32)係位於與第1面（3 1)相反一側之面。自第1面（3 1)入射之 光可自第2面（32)出射。 第3光擴散板（30)之第1面（31)係通常為平坦面，且既可 為鏡面’亦可為遍及整面具有光擴散性之面。 於第3光擴散板（30)之第2面（32)上形成有凸狀部（33)。該 凸狀部（33)係沿第1方向（X3 1)延伸者。該凸狀部（33)係複 數個形成於第2面（32)，且沿第2方向（X32)並列配置。第2 方向（X32)係與第1方向（X31)正交之方向。形成於第2面 (32)上之複數個凸狀部（33)之剖面形狀可於凸狀部（3 3)間大 致相同’亦可組合使用X軸方向之長度不同之複數種凸狀 部。 再者，第3光擴散板（30)之厚度（d3)係為自第1面（31)起至 凸狀部（33)之頂部為止之距離。第3光擴散板（3〇)係厚度 (d3)為例如（u mm〜5 mm ’且既可為膜狀，亦可為片狀， 但通常為厚度（c!3)未滿1 mm之膜狀'。 第3光擴散板（30)係如上定義者，形成於該第3光擴散板 Π 150084.doc 201128235 (30)之第2面（32)上之凸狀部（33)係其剖面形狀可為例如等 腰三角形，亦可為與作為第丨光擴散板（1〇)中之凸狀部（13) 所述者相同之形狀。 第1光擴散板（10)之凸狀部（13)與第3光擴散板（30)之凸狀 4 (33)可互為相同之剖面形狀，亦可為不同之剖面形狀。 較佳為，第3光擴散板（30)之凸狀部^”係匕及、由上述 (B)表示之範圍。 [第4光擴散板] 第4光擴散板（40)係包括第1面（41)與第2面（42)。第2面 (42)係位於與第1面（41)相反一側之面。自第丨面（41)入射之 光可自第2面（42)出射。 第4光擴散板（40)之第1面（41)係通常為平坦面，且既可 為鏡面，亦可為遍及整面具有光擴散性之面。 於第4光擴散板（40)之第2面（42)上形成有凸狀部（43)。該 凸狀部（43)係沿第1方向（X41)延伸者。該凸狀部（43)係複 數個形成於第2面（42) ’且沿第2方向（X42)並列配置。第2 方向（X42)係與第1方向（X41)正交之方向。形成於第2面 (42)上之複數個凸狀部（43)之剖面形狀可於凸狀部（43)間大 致相同’亦可組合使用X軸方向之長度（wa)不同之複數種 凸狀部。 再者，第4光擴散板（40)之厚度（d4)係為自第丨面^丨）起至 凸狀部（43)之頂部為止的距離。第4光擴散板（40)係厚度 (d4)為例如〇.1 mm~5 mm ’且既可為膜狀，亦可為片狀， 但通常為厚度（d4)未滿1 mm之膜狀。 150084.doc 12 201128235 形成於第4光擴散板（40)之第2面（42)之凸狀部（43)係其剖 面形狀可為例如等腰三角形，亦可為與作為第1光控制板 (10)及第2光擴散板（20)中之凸狀部（丨3、23)所述者相同之 形狀。 再者，第2光擴散板（20)之凸狀部（23)與第4光擴散板（40) 之凸狀部（43)可互為相同之剖面形狀，亦可為不同之剖面 形狀。 [光擴散板之構成材料] 第1光擴散板（10)、第2光擴散板（2〇)、第3光擴散板（30) 及第4光擴散板（40)係包含透明材料。透明材料之折射率為 例如1.46〜1.62 ’構成第1光擴散板（丨〇)之透明材料之折射 率通常為1.56〜1.62。作為透明材料，可例示透明樹脂材 料、透明玻璃材料，作為透明樹脂材料，可例示聚碳酸酯 樹脂（Polycarbonate，PC)(折射率：159)、MS 樹脂（methyl methaerylate-styrene copolymer resin，甲基丙烯酸甲酯-苯 乙稀共聚物樹脂）（折射率：丨56〜丨59)、聚苯乙烯 (Polystyrene，PS)樹脂（折射率：159)等，而考慮到成本方 面及吸濕率低之方面，較佳為聚苯乙烯樹脂。 於使用透明樹脂材料作為透明材料時’亦可對該透明樹 脂材料添加紫外線吸收劑、抗靜電劑、抗氧化劑、加工穩 定劑、阻燃劑、潤滑劑等添加劑。該等添加劑可分別單獨 使用或組合2種以上使用。 作為紫外線吸收劑，可列舉例如笨并三唑系紫外線吸收 劑、二苯曱酮系紫外線吸收劑、氰基丙烯酸酯系紫外線吸 I50084.doc 201128235 收劑、丙二酸酯系紫外線吸收劑、草酸笨胺系紫外線吸收 劑、三嗪系紫外線吸收劑等，較佳為苯并三唑系紫外線吸 收劑、三嗪系紫外線吸收劑。 透明樹脂材料通常使用時不添加光擴散劑作為添加劑， 但若為無損本發明目的之微量，則亦可添加使用光擴散 劑。 作為對透明材料添加光擴散劑時所用之光擴散劑，通常 係使用折射率與構成第丨光擴散板（1〇)、第2光擴散板 (2〇)、第3光擴散板（30)及第4光擴散板（4〇)之透明材料不同 之粉末’且可使該粉末分散於透明材料中使用。作為如此 之光擴U T使用例如苯乙稀樹脂粒+、甲&丙稀酸樹 脂粒子等有機粒子、及碳酸㈣子m粒子等無機粒 子’其之粒徑通常為0 8 μηι〜50 μηι。 [光擴散板之層構成] 第】光擴散板⑽、第2光擴散板（2〇)、第3光擴散板（3〇 及第4光擴散板（40)可為包含單一之透明材料之單層板，功 可為由包含相互^同之透明㈣之層積層所得之構造的多 :::於光擴散板(10、20、30、4〇)為多層板之情形時， 光擴散板（10、2〇、30、40、夕留&斗、 )之早面或兩面為形成有通常厚 ::、μηι 200 μηι、較佳為2〇 _〜1〇〇 _之表層的構 :透明添加有紫外線吸收劑者作為構成該表層 來自二I藉由如此之構成，而防止有時包含於 3。、4〇;劣:光中之紫外線造成光擴散板 尤其於使用螢光燈管等作為光源之情形 J50084.doc 201128235 時，因可防止來自螢光燈管之紫外線造成劣化，因此，較 佳為於第1面（11、21、31、41)上形成有表層，此時，就成 本方面而言，更佳為第2面(12、22、32、42)上不形成表 層。當使用透明樹脂材料中添加有紫外線吸收劑者作為 構成表層之透明材料時，f外線吸收劑之含量以透明樹脂 材料為基準，it常為〇.5重量％〜5重量％，較佳以重量曰 %〜2.5重量％。 第1光擴散板⑽、第2光擴散板(2〇)、第3光擴散板(3〇) 及第4光擴散板（4G)可於單面或兩面塗佈有抗靜電劑。可藉 由塗佈抗靜電劑，而防止靜電引起灰塵附著等，從而可防 止灰塵附著引起光線透射率下降。 [光擴散板之製造] 第1光擴散板（10)、第2光擴散板（20)、苐3光擴散板（3〇) 及第4光擴散板（4〇)例如可藉由自透明材料進行切削之方法 而製造。又，當使用透明樹脂材料作為透明材料時，例如 可藉由射出成形法、擠壓成形法、衝壓成形法、光聚合物 法等通常之方法而製造。 [複合光控制板] 本實施形態之複合光控制板（1)係由如此之第1光擴散板 (10)、第2光擴散板（20)、第3光擴散板（30)及第4光擴散板 (40)以該順序相互重合而成者。 如圖1所示，於本實施形態之複合光控制板（1)中，第2 光擴散板（20)係第1方向（X21)平行於第！光擴散板（1〇)之第 1方向（XII)。第3光擴散板30係第1方向（X31)與第i光擴散 150084.doc -15· 201128235 板（10)之第1方向（XII)正交。第4光擴散板（40)係第1方向 (X41)平行於第1光擴散板（10)之第1方向（XII)。 如圖1所示’於本實施形態之複合光控制板（；[)中，第2 光擴散板（20)係第1面（21)與第1光擴散板（1〇)之第2面（12) 相對向。第2光擴散板（20)係通常介隔空氣層而與第1光擴 散板（10)重合，且其間隔為自形成於第1光擴散板（1〇)之第 2面（12)上之凸狀部（13)之頂部（13b)起至第2光擴散板（2〇) 之第1面（21)為止的距離（d 12)，通常為5 mm以下，考慮到 使複合光控制板（1)緊湊化之觀點，該距離（dl2)可為〇 mm，故形成於第1光擴散板（10)上之凸狀部（13)之頂部 (13b)可與第2光擴散板（20)之第1面（21)相接。 第3光擴散板（30)係第1面（31)與第2光擴散板（2〇)之第2面 (22)相對向。第3光擴散板（30)係通常介隔空氣層而與第2 光擴散板（20)重合，且其間隔為自形成於第2光擴散板（2〇) 之第2面（22)上之凸狀部（23)之頂部（23b)起至第3光擴散板 (30)之第1面（31)為止的距離（d23)，通常為$ mm以下，考 慮到使複合光控制板（1)緊湊化之觀點，該距離（d23)可為〇 mm，故形成於第2光擴散板（2〇)上之凸狀部（23)之頂部 (23b)可與第3光擴散板（3〇)之第1面（31)相接。 第4光擴散板（40)係第1面（41)與第3光擴散板（3〇)之第2面 (32)相對向。第4光擴散板（40)係通常介隔空氣層而與第3 光擴散板（30)重合，且其間隔為自形成於第3光擴散板（3〇) 之第2面（32)上之凸狀部（33)之頂部（33b)起至第4光擴散板 (4〇)之第1面（41)為止的距離（d34)，通常為5 mm以下，考 150084.doc -16· 201128235 慮到使複合光控制板（1)緊湊化之觀點，該距離（d34)可為〇 mm，故形成於第3光擴散板（3〇)上之凸狀部（33)之頂部 (33b)可與第4光擴散板（4〇)之第1面（41)相接。 於可防止形成於第1光擴散板（10)之第2面（12)及第2光擴 散板（20)之第2面（22)上之凸狀部（丨3、23)引起疊紋產生之 方面，較佳為第2光擴散板（20)之第1面（21)係遍及整面具 有光擴散性之面。為使第丨面^丨）為具有光擴散性之面，例 如可由包含稱作霧化劑之微細粒子之表層構成第〖面（21)， 亦可對第1面（21)實施壓花加工、喷擊加工，抑或可塗佈包 含霧化劑及黏合劑之塗佈液而形成霧化層。 於可防止疊紋之方面，較佳為，也由相互寬度不同之複 數種凸狀部（13、23)構成形成於第丨光擴散板（1〇)之第2面 (12)上之凸狀部（13)、或形成於第2光擴散板（2〇)之第2面 (22)上之凸狀部（23)，且以不規則之順序並列配置該等複 數種凸狀部（13、23)。 於可防止形成於第2光擴散板（2〇)之第2面（22)及第4光擴 散板（40)之第2面（42)上之凸狀部（23、43)引起疊紋產生之 方面’較佳為第4光擴散板（4〇)之第1面（41)係遍及整面具 有光擴散性之面。為使第丨面（41)為具有光擴散性之面，例 如可由包含稱作霧化劑之微細粒子之表層構成第1面（41)， 亦可對苐1面（41)實施壓花加工、喷擊加工，抑或可塗佈包 含霧化劑及黏合劑之塗佈液而形成霧化層。 於可防止疊紋方面’較佳為，亦由相互寬度不同之複數 種凸狀部（23、43)構成形成於第2光擴散板（2〇)之第2面（22) 150084.doc -17- 201128235 上之凸狀部（23)、或形成於第4光擴散板（40)之第2面（42)上 之凸狀部（43)，且以不規則之順序並列配置該等複數種凸 狀部（23、43)。 於可防止形成於第1光擴散板（1〇)之第2面（12)及第4光擴 散板（40)之第2面（42)上之凸狀部（13、43)引起疊紋產生之 方面’較佳為第4光擴散板（40)之第1面（41)係遍及整面具 有光擴散性之面。 於可防止疊紋方面’較佳為，亦由相互寬度不同之複數 種凸狀部（13、43)構成形成於第1光擴散板（1〇)之第2面（12) 上之凸狀部（13)、或形成於第4光擴散板（40)之第2面（42)上 之凸狀部（43) ’且以不規則之順序並列配置該等複數種凸 狀部（13、43)。 第1光擴散板（10)之第1面（11)及第3光擴散板（30)之第1面 (3 1)亦可為具有光擴散性之面。為使該等第1面（u、3丨）為 具有光擴散性之面而言，例如可由包含稱作霧化劑之微細 粒子之表層構成該等第1面、31)，亦可對第1面（u、 3 1)實施壓花加工、噴擊加工’抑或可將霧化劑與黏合劑 混合製成塗佈液，並將該塗佈液塗佈於第1面（u、3丨）而賦 予光擴散性。 [面光源裝置] 如圖4所不’本實施形態之複合光控制板（丨）係組裝於面 光源裝置（6)中而較佳使用者。該面光源裝置（6)係包括本 實施形態之複合光控制板（1)及光源（7)者。 光源（7)係為複數個且相互隔開配置^該光源（7)對構成 150084.doc -18- 201128235 複cr光控制板（1)之第丨光擴散板（1〇)之第丨面（⑴供給光。 [光源] 作為光源（7) ’可列舉例如冷陰極射線管等線狀光源， 但較佳為LED(Light Emitting Diode，發光二極體）等點狀 光源。 複數個光源（7)之間之間隔（L)係光源中心間之距離，且 通常為10 mm〜150 mm»自光源（7)中心起至第擴散板 (1〇)之第1面（11)為止之距離（D)通常為3 mm〜5〇 mm，而考 慮到可使面光源裝置變薄之方面，該等間隔L與距離〇之 比[L/D]較佳為2以上，更佳為2_5以上。 [透過型圖像顯示裝置] 如圖4所示，該面光源裝置（6)係組裝於透過型圖像顯示 裝置（8)中而較佳使用者。該透過型圖像顯示裝置（8)係包 括上述面光源裝置（6)與透過型圖像顯示部（9)。作為透過 型圖像顯示部（9)’例示有例如包括液晶單元（91 )、及配置 於該液晶單元（91)之兩面上之直線偏光板（92)的透過型液 晶顯示部。於該透過型圖像顯示裝置（8)中，透過型圖像顯 示部（9)係藉由透過複合光控制板（〇之光而得到照明，從 而進行圖像顯示。透過複合光控制板（1)之光係為自構成面 光源裝置（6)之複數個光源（7)中輸出之光。 [複合光控制板之配置] 於透過型圖像顯示裝置（9)中，複合光控制板（1)配置成 第1光擴散板（10)之第1方向（XII)既可為畫面之橫向，亦可 為縱向。 150084.doc •19- 201128235 [第1光擴散板之第1方向為橫向之情形時] 若以第1光擴散板（10)之第1方向（XU)成為畫面之橫向之 方式，配置本實施形態之複合光控制板〇)，則第1光擴散 板（10)之第2方向（XI 2)成為縱向，第3光擴散板（30)之第2 方向（X32)成為橫向，而於該情形時，可進一步抑制自斜 橫方向觀察時之亮度不均，故表示第3光擴散板（3〇)之凸狀 部（33)之輪廓形狀之式⑺中之心與％之比[R3=ha/w^，較 佳為小於表示第1光擴散板（1〇)之凸狀部（13)之輪廓形狀之 式（2)中之113與Wa之比[Ri=ha/wa]，又，表示第3光擴散板 (3 0)之凸狀部（33)之輪廓形狀之式（2)中之、，較佳為小於 表不第1光擴散板（1〇)之凸狀部（13)之輪廓形狀之式中之 ka。策佳為’於透過型圖像顯示裝置（9)中之光源（7)之配 置中，晝面之縱向之光源間隔（LV)等於或者大於橫向之光 源間隔（LH)。 [第1光擴散板之第1方向為縱向之情形時] 右以第1光擴散板（1〇)之第！方向（Χ11)成為畫面之縱向之 方式，配置本實施形態之複合光控制板，則第丨光擴散 板（1〇)之第2方向（χΐ2)成為橫向，第3光擴散板（3〇)之第2 方向（Χ32)成為縱向，而於該情形時，可進一步抑制自斜 杈方向觀察時之亮度不均，故表示第丨光擴散板（1〇)之凸狀 4 (13)之輪廓形狀之式（2)中之^與％之比[R1=ha/wj，較 佳為小於表不第3光擴散板（3〇)之凸狀部之輪廓形狀之 弋（2)中之1^與wa之比[R3=ha/Wa]，又，表示第j光擴散板 (1〇)之凸狀部（13)之輪廓形狀之式（2)中之ka，較佳為小於 150084.doc •20· 201128235 表示第3光擴散板（3G)之凸狀部（33)之輪㈣狀之式⑺中之 3更佳為，於透過型圖像顯示裝置（9)中之光源（7)之配 置中，晝面之縱向之光源間隔（LV)等於或者大於橫向之光 源間隔（LH)。 【圖式簡單說明】 圖1係模式性表示本實施形態之複合光控制板之圖式。 圖2係模式性表示形成於第1光控制板上之凸狀部之剖面 形狀之一例之圖式。 圖3係表示凸狀部之剖面形狀之輪廓線所滿足之條件之 圖式。 圖4係模式性表示組裝有本實施形態之複合光控制板之 面光源裝置及透過型圖像顯示裝置之圖式。 圖5係模式性表示先前之面光源裝置及透過型圖像顯示 裝置之圖式。 【主要元件符號說明】 1 複合光控制板 6 面光源裝置 7 光源 8 直下式圖像顯示裝置 9 透過型圖像顯示部 10 第1光擴散板 11 第1面 12 第2面 13 凸狀部 150084.doc • 21 - 201128235 13a 凸狀部之兩端 13b 凸狀部之頂點 20 第2光擴散板 21 第1面 22 第2面 23 凸狀部 23b 凸狀部之頂點 30 第3光擴散板 3 1 第1面 32 第2面 33 凸狀部 33b 凸狀部之頂點 40 第4光擴散板 41 第1面 42 第2面 43 凸狀部 91 液晶早元 92 直線偏光板 101 先前之光控制板 107 先前之光源 108 先前之直下式圖像顯示裝置 109 先前之透過型圖像顯示部 191 先前之液晶早元 192 先前之直線偏光板 150084.doc .22· 201128235 dl、d2、d3、d4 厚度 dl2 、 d23 、 d34 、 D 距離 L 間隔 Xll 第1方向 X12 第2方向 X21 第1方向 X22 第2方向 X31 第1方向 X32 第2方向 X41 第1方向 X42 第2方向 I50084.doc -23-Ka is -1.0 or more and is not full (in the formula (2), 1^ is 〇.25^^~0.75 0)]. [Effect of the Invention] According to the present invention, it is possible to provide a light-emitting control panel, a surface light source device including the composite light control panel, and a transmissive image display device which can suppress the unevenness of luminance more stably. [Embodiment] [Composite Light Control Panel] As shown in Fig. 1, the composite light control panel (1) of the present embodiment is composed of a first light diffusion plate (first light control plate) (10) and a second light diffusion plate. The (second light control panel) (20), the third light diffusion plate (third light control plate) (30), and the fourth light diffusion plate (fourth light control plate) (4 inch) are superposed on each other. The first light diffusing plate (1), the second light diffusing plate (20), the third light diffusing plate (30), and the fourth light diffusing plate (40) are stacked in the order of the first light diffusing plate (10). The order of the second light diffusing plate (20), the third light diffusing plate (30), and the fourth light diffusing plate (40). [First Light Diffusing Plate] The first light diffusing plate (10) includes a first surface (11) and a second surface (12). The second surface (12) is located on the side opposite to the first surface (u). Light incident from the first surface (u) can be emitted from the second surface (12). The first surface (11) of the first light diffusing plate (10) is usually a flat surface, and may be a mirror surface or a surface having light diffusibility throughout the entire surface. A convex portion (13) is formed on the second surface (12). The convex portion (丨3) is extended in the first direction (XII). The convex portions (13) are formed in plural on the second surface (12) and arranged in parallel along the second direction (X12). The second direction (X1 2) is a direction orthogonal to the working direction (XII). The cross-sectional shape of the plurality of convex portions (13) formed on the second surface (12) may be substantially the same between the convex portions (13), or a plurality of types of convexities having different lengths (Wa) in the X-axis direction may be used in combination. Shape. Further, the thickness (dl) of the first light diffusing plate (1) is a distance from the first surface (u) to the top of the convex portion (13) of 150084.doc 201128235. The thickness (dl) of the first light diffusing plate (1 Å) is, for example, 〇·ι mm to 5 mm, and may be in the form of a film or a sheet, but is usually in the form of a sheet having a thickness (dl) of 1 m m or more. [Convex portion] The convex portion (13) formed on the second surface (12) of the first light diffusing plate (1) has a contour shape represented by 2〇〇 which satisfies the above formula (1). An example of the cross-sectional shape of such a Z-shaped portion (13) is shown in Fig. 2 . Fig. 2 is an enlarged view of a convex portion (13). The shape of the convex portion is illustrated in the 5 χζ coordinate system using the partial χζ coordinate system shown in FIG. 2, and the X-axis is a direction in which a plurality of convex portions (丨3) are arranged and parallel to the second direction (χΐ2). ) The axis. The x-axis is an axis parallel to the thickness direction of the light diffusing plate (10), and the first! The direction (Χ11) and the second direction (Χ12) are orthogonal. The cross-sectional shape of the convex portion (13) in the facet of the χζ coordinate system is two turns (13 & 13a) on the χ axis and the top (1%) on the ζ axis. The cross-sectional shape of the convex portion (13) has a contour line symmetrical with the two axes. When the length of the convex portion (13) in the x-axis direction is set to ^, in the range of _ 0,475wasx$ 0.475Wa, it is satisfied by the following formula (1) 2 (5〇表〇[ Number 3] 0·95χζ〇(χ)<2(χ)<ι.〇5χζ〇(χ) [In the formula (1), 'ζ〇(χ) is defined by the formula (2): 150084.doc 201128235 [Number 4] 8弋丄ζ0(χ) = ha —-\w〇) ...(.) u(+'Mj+纸(五) V / (in equation (2), ha is 〇25Wa~0.75Wa,匕 is 〇 〇 且 且 。 。 。 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图 图The length of the axis direction of the axis is 1^ and the convex portion (13) corresponds to the maximum height between the ends (13a, 13a) of the convex portion (I) when "(the shape is indicated). The outline of the shape (13) is as shown in Fig. 3. If z 〇 (x) ' is obtained for a certain width %, it can be represented by a contour represented by 0.95xz 〇 (4) and by 1 · 05 Xz 〇 (x The contour of the region between the contour lines is indicated. The width Wa of the convex portion (13) is easily formed by the convex portion (13), and is usually 40 μη or more, preferably 250 μη. ι is above, and since the texture of the convex portion (13) is difficult to recognize by the naked eye, it is usually 800 μηι or less, preferably 45 μm μπα. As the width wa, specifically, 'Wa=41〇μηι, Wa= 4〇〇μηι and wa=325 μηι, but the wa value is not limited to the above. The convex portion (13) is preferably ha in the above formula (2): W.4Wa~0.7Wa, 1^ is preferably -0.5 or more. As 113 and ka, it is preferable that: (A) ha is 48.4825wa~0.521wa and ]^ is -〇.232~-0.227, or ha is 0.4852~3~0.521\¥3 and]< ;;3 is -〇.232~-〇.227, (B) hA〇.5966wa~0.6837wjkag-〇.〇75~-0.069, 150084.doc •9- 201128235 (C)ha is 〇.525wa and ka The shape of the convex portion (13) indicated by the above (Α) as hAka is specifically, for example, a shape represented by Ma=0.521Wa and ka=_〇229, and ha= a shape shown by 0.521 wa and ka=-0.227, and a shape represented by ha=〇4825ν^ and ka=-0.232. The shape of the convex portion (13) represented by the above (B) is specifically For example, a shape indicated by ha=0.5966wa and ka=-0.〇75' ha-0.6837wa and ka = -0.069 shape of FIG. More preferably, the first light-diffusing sheet (1〇) is ha and is in the range shown in the above (b). [Second Light Diffusing Plate] The second light diffusing plate (20) includes a first surface (21) and a second surface (22). The second surface (22) is located on the side opposite to the first surface (2 1). Light incident from the first surface (2 turns) can be emitted from the second surface (22). The first surface (21) of the second light diffusing plate (20) is usually a flat surface, and may be a mirror surface or a surface having light diffusibility throughout the entire surface. A convex portion (23) is formed on the second surface (22) of the second light diffusing plate (20). The convex portion (23) extends in the first direction (X21). The convex portions (23) are formed in plural on the second surface (22) and arranged in parallel along the second direction (X22). The second direction (X22) is a direction orthogonal to the first direction (X2 1). The cross-sectional shape of the plurality of convex portions (23) formed on the second surface (22) may be substantially the same between the convex portions (23), or a plurality of types of convexities having different lengths (wa) in the X-axis direction may be used in combination. Shape. Further, the thickness (d2) of the second light diffusing plate (20) is a distance from the first surface (21) to the top of the convex portion (23) of 150084.doc -10·201128235. The thickness (d2) of the second light-diffusing sheet (2) is, for example, 〇1 mm to 5 mm′ and may be in the form of a film or a sheet, but is usually a film having a thickness (d2) of less than 1 mm. shape. The convex portion (23) formed on the second surface (22) of the second light diffusing plate (20) may have a cross-sectional shape such as an isosceles triangle, or may be used as the first light diffusing plate (10). The convex portion (13) has the same shape as described above. [Third Light Diffusing Plate] The third light diffusing plate (30) includes a first surface (31) and a second surface (32). The second surface (32) is located on the side opposite to the first surface (31). Light incident from the first surface (31) can be emitted from the second surface (32). The first surface (31) of the third light diffusing plate (30) is usually a flat surface, and may be a mirror surface or a surface having light diffusibility throughout the entire surface. A convex portion (33) is formed on the second surface (32) of the third light diffusing plate (30). The convex portion (33) is extended in the first direction (X3 1). The convex portions (33) are formed in plural on the second surface (32) and arranged in parallel along the second direction (X32). The second direction (X32) is a direction orthogonal to the first direction (X31). The cross-sectional shape of the plurality of convex portions (33) formed on the second surface (32) may be substantially the same between the convex portions (33). A plurality of convex portions having different lengths in the X-axis direction may be used in combination. . Further, the thickness (d3) of the third light diffusing plate (30) is a distance from the first surface (31) to the top of the convex portion (33). The thickness (d3) of the third light diffusing plate (3 Å) is, for example, (u mm to 5 mm ' and may be in the form of a film or a sheet, but usually the thickness (c! 3) is less than 1 mm. The third light diffusing plate (30) is defined as above, and the convex portion (33) formed on the second surface (32) of the third light diffusing plate 150084.doc 201128235 (30) is The cross-sectional shape may be, for example, an isosceles triangle, or may be the same shape as that described for the convex portion (13) in the second light diffusing plate (1). The convex portion of the first light diffusing plate (10) (13) The convex shape 4 (33) of the third light diffusing plate (30) may have the same cross-sectional shape or may have a different cross-sectional shape. Preferably, the third light diffusing plate (30) has a convex shape. The fourth light diffusing plate (40) includes a first surface (41) and a second surface (42). The second surface is the range indicated by the above (B). (42) is located on the opposite side of the first surface (41). Light incident from the second surface (41) can be emitted from the second surface (42). The first surface of the fourth light diffusion plate (40) (41) is usually a flat surface, and can be either a mirror surface or a light diffusing property over the entire surface. A convex portion (43) is formed on the second surface (42) of the fourth light diffusing plate (40). The convex portion (43) extends in the first direction (X41). (43) The plurality of layers are formed on the second surface (42)' and arranged in parallel along the second direction (X42). The second direction (X42) is orthogonal to the first direction (X41). The second surface is formed on the second surface. (42) The cross-sectional shape of the plurality of convex portions (43) may be substantially the same between the convex portions (43). A plurality of convex portions having different lengths (wa) in the X-axis direction may be used in combination. The thickness (d4) of the fourth light diffusing plate (40) is the distance from the second surface to the top of the convex portion 43. The fourth light diffusing plate (40) is thick (d4) For example, 〇.1 mm~5 mm ' and may be in the form of a film or a sheet, but usually a film having a thickness (d4) of less than 1 mm. 150084.doc 12 201128235 Formed on the fourth light diffusing plate The convex portion (43) of the second surface (42) of (40) may have a cross-sectional shape such as an isosceles triangle, or may be a first light control plate (10) and a second light diffusion plate (20). The convex shape (丨3, 23) of the middle has the same shape. The convex portion (23) of the second light diffusing plate (20) and the convex portion (43) of the fourth light diffusing plate (40) may have the same cross-sectional shape or may have different cross-sectional shapes. The constituent material of the light diffusing plate] The first light diffusing plate (10), the second light diffusing plate (2), the third light diffusing plate (30), and the fourth light diffusing plate (40) are made of a transparent material. The refractive index is, for example, 1.46 to 1.62'. The refractive index of the transparent material constituting the first light-diffusing sheet (丨〇) is usually 1.56 to 1.62. As the transparent material, a transparent resin material or a transparent glass material can be exemplified, and as the transparent resin material, a polycarbonate resin (Polycarbonate, PC) (refractive index: 159), a MS resin (methyl methaerylate-styrene copolymer resin, methacrylic acid) can be exemplified. Methyl ester-styrene copolymer resin) (refractive index: 丨56~丨59), polystyrene (PS) resin (refractive index: 159), etc., taking into account cost and low moisture absorption Preferably, it is a polystyrene resin. When a transparent resin material is used as the transparent material, additives such as an ultraviolet absorber, an antistatic agent, an antioxidant, a processing stabilizer, a flame retardant, and a lubricant may be added to the transparent resin material. These additives may be used alone or in combination of two or more. Examples of the ultraviolet absorber include a stupid triazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, a cyanoacrylate-based ultraviolet absorber I50084.doc 201128235, a malonate-based ultraviolet absorber, and oxalic acid. The stupid amine-based ultraviolet absorber, the triazine-based ultraviolet absorber, and the like are preferably a benzotriazole-based ultraviolet absorber or a triazine-based ultraviolet absorber. The transparent resin material is usually used without adding a light diffusing agent as an additive, but a light diffusing agent may be added if it is not detrimental to the object of the present invention. As a light diffusing agent used when a light diffusing agent is added to a transparent material, a refractive index and a first light diffusing plate (1 〇), a second light diffusing plate (2 〇), and a third light diffusing plate (30) are usually used. And the transparent material of the fourth light diffusing plate (4 inch) is different in powder' and the powder can be dispersed and used in a transparent material. As such a light-expanding U T, for example, organic particles such as styrene resin particles +, a & acrylic resin particles, and inorganic particles such as carbonic acid (tetra) m particles are used, and the particle diameter thereof is usually 0 8 μηι to 50 μηι. [Layer Configuration of Light Diffusing Plate] The first light diffusing plate (10), the second light diffusing plate (2), and the third light diffusing plate (3) and the fourth light diffusing plate (40) may be made of a single transparent material. A single-layer board, the function may be a structure obtained by including a layer of transparent layers of the same (4): when the light-diffusing board (10, 20, 30, 4〇) is a multi-layer board, the light diffusing board (10, 2〇, 30, 40, 夕留 & bucket, ) The early or both sides are formed with a thickness of usually: :, μηι 200 μηι, preferably 2〇_~1〇〇_: A person who is transparently added with a UV absorber is configured to form the surface layer from the second layer, and is prevented from being included in the 3, 4, and 4; inferior: ultraviolet light in the light causes the light diffusing plate to be particularly used, such as a fluorescent tube. In the case of a light source, J50084.doc 201128235, since it is possible to prevent deterioration of ultraviolet rays from the fluorescent tube, it is preferable to form a surface layer on the first surface (11, 21, 31, 41). In terms of cost, it is more preferable that no surface layer is formed on the second surface (12, 22, 32, 42). When a transparent resin material is used, ultraviolet rays are added. When the collector is a transparent material constituting the surface layer, the content of the f-line absorbent is based on the transparent resin material, and it is usually 5% by weight to 5% by weight, preferably 曰% to 2.5% by weight. The light diffusing plate (10), the second light diffusing plate (2), the third light diffusing plate (3), and the fourth light diffusing plate (4G) may be coated with an antistatic agent on one or both sides. An antistatic agent is disposed to prevent dust from adhering due to static electricity, thereby preventing the light transmittance from being lowered due to adhesion of dust. [Manufacture of Light Diffuser] First Light Diffuser (10), Second Light Diffuser (20), 苐The light diffusing plate (3 turns) and the fourth light diffusing plate (4 turns) can be produced, for example, by cutting from a transparent material. Further, when a transparent resin material is used as the transparent material, for example, injection molding can be used. It is produced by a usual method such as a method, an extrusion molding method, a press molding method, or a photopolymer method. [Composite Light Control Panel] The composite light control panel (1) of the present embodiment is such a first light diffusion plate (10) ), the second light diffusing plate (20), the third light diffusing plate (30), and the fourth light diffusing plate (40) As shown in Fig. 1, in the composite light control panel (1) of the present embodiment, the second light diffusing plate (20) is parallel to the first light diffusing plate in the first direction (X21) ( In the first direction (XII) of the first light diffusing plate 30, the first light direction (X31) is orthogonal to the first direction (XII) of the ith light diffusion 150084.doc -15·201128235 plate (10). The fourth light diffusing plate (40) is parallel to the first direction (XII) of the first light diffusing plate (10) in the first direction (X41). As shown in Fig. 1, the composite light control panel of the present embodiment (; In [), the first light diffusing plate (20) faces the first surface (21) and faces the second surface (12) of the first light diffusing plate (1). The second light diffusing plate (20) is superposed on the first light diffusing plate (10) with the air layer interposed therebetween, and the interval is formed from the second surface (12) formed on the first light diffusing plate (1). The distance (d 12) from the top (13b) of the convex portion (13) to the first surface (21) of the second light diffusing plate (2) is usually 5 mm or less, in consideration of making the composite light control From the viewpoint of compacting the plate (1), the distance (dl2) may be 〇mm, so that the top portion (13b) of the convex portion (13) formed on the first light diffusing plate (10) and the second light diffusing plate may be used. The first side (21) of (20) is connected. The third light diffusing plate (30) faces the first surface (31) and the second surface (22) of the second light diffusing plate (2). The third light diffusing plate (30) is generally overlapped with the second light diffusing plate (20) via an air layer, and the interval is formed from the second surface (22) formed on the second light diffusing plate (2). The distance (d23) from the top (23b) of the convex portion (23) to the first surface (31) of the third light diffusing plate (30) is usually not more than $ mm, and it is considered that the composite light control panel is 1) From the viewpoint of compactness, the distance (d23) may be 〇mm, so that the top portion (23b) of the convex portion (23) formed on the second light diffusing plate (2〇) may be combined with the third light diffusing plate ( The first side (31) of the 3〇) is connected. The fourth light diffusing plate (40) faces the first surface (41) and the second surface (32) of the third light diffusing plate (3). The fourth light diffusing plate (40) is generally overlapped with the third light diffusing plate (30) via an air layer, and is spaced apart from the second surface (32) formed on the third light diffusing plate (3). The distance (d34) from the top (33b) of the convex portion (33) to the first surface (41) of the fourth light diffusing plate (4) is usually 5 mm or less, and 150084.doc -16· 201128235 Considering the viewpoint of making the composite light control panel (1) compact, the distance (d34) can be 〇mm, so it is formed on the top of the convex portion (33) on the third light diffusion plate (3〇) (33b) ) can be in contact with the first surface (41) of the fourth light diffusing plate (4〇). It is possible to prevent the convex portions (丨3, 23) formed on the second surface (12) of the first light diffusing plate (10) and the second surface (22) of the second light diffusing plate (20) from causing the embossing In the case of generation, it is preferable that the first surface (21) of the second light-diffusing sheet (20) has a surface having light diffusibility throughout the entire surface. In order to make the surface of the second surface a light diffusing surface, for example, the surface (21) may be formed of a surface layer containing fine particles called an atomizing agent, and the first surface (21) may be embossed. The spray coating process or the coating liquid containing the atomizing agent and the binder may be applied to form an atomized layer. In order to prevent moiré, it is preferable that the plurality of convex portions (13, 23) having different widths are formed to form a convex surface formed on the second surface (12) of the second light diffusing plate (1). a portion (13) or a convex portion (23) formed on the second surface (22) of the second light diffusing plate (2), and the plurality of convex portions are arranged side by side in an irregular order ( 13, 23). It is possible to prevent the convex portions (23, 43) formed on the second surface (22) of the second light diffusing plate (2) and the second surface (42) of the fourth light diffusing plate (40) from causing the embossing In the aspect of production, it is preferable that the first surface (41) of the fourth light-diffusing sheet (4) is a surface having light diffusibility over the entire surface. In order to make the first surface (41) a light diffusing surface, for example, the first surface (41) may be formed of a surface layer containing fine particles called an atomizing agent, and the 苐1 surface (41) may be embossed. The spray coating process or the coating liquid containing the atomizing agent and the binder may be applied to form an atomized layer. Preferably, it is preferably formed of a plurality of convex portions (23, 43) having different widths and formed on the second surface (22) of the second light diffusing plate (2) 150084.doc - 17- 201128235 The convex portion (23) or the convex portion (43) formed on the second surface (42) of the fourth light diffusing plate (40), and the plural numbers are arranged in parallel in an irregular order a convex portion (23, 43). The convex portion (13, 43) formed on the second surface (12) of the first light diffusing plate (1) and the second surface (42) of the fourth light diffusing plate (40) is prevented from causing the embossing In the aspect of production, it is preferable that the first surface (41) of the fourth light diffusing plate (40) has a light diffusing surface over the entire surface. Preferably, it is preferable to form a convex shape formed on the second surface (12) of the first light diffusing plate (1) by a plurality of convex portions (13, 43) having different mutual widths. a portion (13) or a convex portion (43) formed on the second surface (42) of the fourth light diffusing plate (40), and the plurality of convex portions are arranged side by side in an irregular order (13, 43). The first surface (11) of the first light diffusing plate (10) and the first surface (31) of the third light diffusing plate (30) may be surfaces having light diffusibility. In order to make the first surface (u, 3 丨) a light diffusing surface, for example, the first surface, 31) may be formed of a surface layer containing fine particles called an atomizing agent. One side (u, 3 1) is subjected to embossing processing or spray processing. Alternatively, the atomizing agent and the binder may be mixed to form a coating liquid, and the coating liquid is applied to the first surface (u, 3丨). ) imparts light diffusibility. [Face light source device] As shown in Fig. 4, the composite light control panel (丨) of the present embodiment is incorporated in the surface light source device (6), and is preferably used. The surface light source device (6) includes the composite light control panel (1) and the light source (7) of the present embodiment. The light source (7) is plural and arranged apart from each other. The light source (7) is opposite to the first surface of the first light diffusing plate (1) of the 150084.doc -18-201128235 complex cr light control panel (1). (1) Light source. [Light source] The light source (7) 'is a linear light source such as a cold cathode ray tube, but is preferably a point light source such as an LED (Light Emitting Diode). 7) The interval (L) is the distance between the centers of the light sources, and is usually 10 mm to 150 mm»distance from the center of the light source (7) to the first surface (11) of the first diffusion plate (1〇) (D) is usually 3 mm to 5 mm, and the ratio of the interval L to the distance [ [L/D] is preferably 2 or more, more preferably 2_5 or more, in view of making the surface light source device thin. [Transmissive Image Display Device] As shown in Fig. 4, the surface light source device (6) is preferably incorporated in a transmissive image display device (8). The transmissive image display device (8) The light source device (6) and the transmissive image display unit (9) are included. The transmissive image display unit (9) exemplifies, for example, a liquid crystal cell (91). And a transmissive liquid crystal display unit of the linear polarizing plate (92) disposed on both surfaces of the liquid crystal cell (91). In the transmissive image display device (8), the transmissive image display unit (9) is used. The image is displayed by illuminating through the composite light control panel (light of the light). The light transmitted through the composite light control panel (1) is outputted from a plurality of light sources (7) constituting the surface light source device (6). [Configuration of Composite Light Control Panel] In the transmissive image display device (9), the composite light control panel (1) is disposed such that the first direction (XII) of the first light diffusing plate (10) can be a screen. In the case of the first light diffusing plate (10), the first direction (XU) becomes the screen. In the horizontal direction, when the composite light control panel of the present embodiment is disposed, the second direction (XI 2) of the first light diffusing plate (10) is in the vertical direction, and the second direction of the third light diffusing plate (30) is X32) is horizontal, and in this case, brightness unevenness when viewed from the oblique direction can be further suppressed, so that the third is indicated. The ratio of the heart to the % in the outline shape (7) of the convex portion (33) of the diffusion plate (3 〇) [R3 = ha / w ^, preferably smaller than the convexity indicating the first light diffusing plate (1 〇) The ratio of 113 to Wa in the contour shape of the shape (13) (Ri=ha/wa), and the contour shape of the convex portion (33) of the third light diffusing plate (30). In the formula (2), it is preferably smaller than k in the formula of the outline shape of the convex portion (13) of the first light diffusing plate (1). In the configuration of the light source (7) in the transmissive image display device (9), the longitudinal light source spacing (LV) of the pupil plane is equal to or greater than the lateral light source spacing (LH). [When the first direction of the first light diffusing plate is in the vertical direction] Right, the first light diffusing plate (1〇) is the right! When the direction (Χ11) is the vertical direction of the screen, and the composite light control panel of the present embodiment is disposed, the second direction (χΐ2) of the first light diffusing plate (1〇) is the horizontal direction, and the third light diffusing plate (3〇) The second direction (Χ32) becomes the longitudinal direction, and in this case, the unevenness in brightness when viewed from the oblique direction can be further suppressed, so that the outline of the convex shape 4 (13) of the first light diffusing plate (1〇) is indicated. The ratio of ^ to % in the formula (2) [R1 = ha / wj, preferably smaller than the outline of the convex shape of the convex portion of the third light diffusing plate (3 〇) (1) The ratio of ^ to wa [R3=ha/Wa], and the k in the formula (2) indicating the outline shape of the convex portion (13) of the j-th light diffusing plate (1〇) is preferably less than 150084. Doc •20· 201128235 3 of the formula (7) indicating the shape of the wheel (4) of the convex portion (33) of the third light diffusing plate (3G) is more preferably the light source in the transmissive image display device (9) (7) In the configuration, the longitudinal light source spacing (LV) of the facets is equal to or greater than the lateral light source spacing (LH). BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a pattern of a composite light control panel of the present embodiment. Fig. 2 is a view schematically showing an example of a cross-sectional shape of a convex portion formed on a first light control plate. Fig. 3 is a view showing the condition that the outline of the cross-sectional shape of the convex portion satisfies. Fig. 4 is a view schematically showing a surface light source device and a transmissive image display device in which the composite light control panel of the embodiment is incorporated. Fig. 5 is a view schematically showing a pattern of a front surface light source device and a transmissive image display device. [Description of main component symbols] 1 composite light control panel 6 surface light source device 7 light source 8 direct type image display device 9 transmissive image display unit 10 first light diffusing plate 11 first surface 12 second surface 13 convex portion 150084 .doc • 21 - 201128235 13a Both ends 13b of the convex portion The apex of the convex portion 20 The second light diffusing plate 21 The first surface 22 The second surface 23 The convex portion 23b The apex of the convex portion 30 The third light diffusing plate 3 1 first surface 32 second surface 33 convex portion 33b apex of convex portion 40 fourth light diffusing plate 41 first surface 42 second surface 43 convex portion 91 liquid crystal early element 92 linear polarizing plate 101 previous light control panel 107 Previous light source 108 Previous direct type image display device 109 Previous transmission type image display portion 191 Previous liquid crystal early element 192 Previous linear polarizing plate 150084.doc .22· 201128235 dl, d2, d3, d4 Thickness dl2 , d23 , d34 , D Distance L Interval X11 First direction X12 Second direction X21 First direction X22 Second direction X31 First direction X32 Second direction X41 First direction X42 Second direction I50084.doc -23-