201219848 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種光控制板單元、面光源裝置及透過型 圖像顯示裝置。 【先前技術】 作為透過型圖像顯示裝置之一例即直下型圖像顯示裝置 40，例如，如圖16所示，廣泛使用有在透過型圖像顯示部 之背面側配置有光源43者。透過型圖像顯示部1〇之例為 例如於液晶單元11之兩面配置有直線偏光板12、13之液晶 顯不面板。作為光源43，係將複數根如直管型之冷陰極射 線管等之線狀光源互相平行地配置而使用。 作為上述直下型圖像顯示裝置4〇，較理想的是使來自光 源43之光均勻地分散而可均勻地照亮透過型圖像顯示部 10。為此在光源43與透過型圖像顯示部1〇之間，配置並使 用具有使自光源43側入射之光改變其朝向而自相反側之透 過型圖像顯示部10側出射之功能的一片稱為光擴散板之光 控制板42(例如參照專利文獻！：曰本專利特開平7_i989i3 號公報）。再者，由於自光源43輸出之光藉由光控制板42 而作為面狀之光出射，故而光源43與光控制板42構成面光 源裝置41 ^ 先前技術文獻 專利文獻 專利文獻1:日本專利特開平7_198913號公報 【發明内容】 158564.doc 201219848 發明所欲解決之問題 近年來，就節能之觀點而言，正研究將發光二極體用作 光源來代替直管型冷陰極射線管。發光二極體通常為點狀 光源’且發光二極體係離散地配置而使用。 然而’若將先前之面光源裝置所包含之光控制板與如發 光二極體之點狀光源加以組合而用於直下型圖像顯示裝置 中，則存在如下問題：無法使來自點狀光源之光為充分均 勻者’且藉由透過型圖像顯示部所顯示之圖像於點狀光源 附近及自點狀光源隔開之位置上亮度不同。 因此，本發明之目的在於提供一種可進一步實現來自點 肤光源之光之均勻化的光控制板單元、面光源裝置及透過 型圖像顯示裝置。 解決問題之技術手段 本發明之光控制板單元包括於單面上形成有在一方向上 延伸之複數個凸狀部的第1及第2光控制板；（a)第1及2光控 制板係配置於板厚方向上；（b)第1光控制板所具有之複數 個凸狀部係並列配置於與該凸狀部之延伸方向大致正交之 方向上；（c)第2光控制板所具有之複數個凸狀部係並列配 置於與該凸狀部之延伸方向大致正交之方向上；（(1)第1光 控制板所具有之凸狀部之延伸方向與上述第2光控制板所 具有之凸狀部之延伸方向大致正交；（e)關於第1及第2光控 制板所具有之凸狀部之各者，於與該凸狀部之延伸方向大 致正交之剖面上’將通過該凸狀部之兩端之軸設為X轴， 將X轴上通過上述兩端之中心且與X軸正交之軸設為z軸， 158564.doc 201219848 將該凸狀部之X軸方向之長度設為Wa時，該凸狀部之剖面 形狀於-0.475xwa$ 〇.475xwa之條件下由滿足式（1)之 z(x)表示， [數1] 0.95xz〇(x)^ z(x)^ 1.05xz〇(x)...(1) 其中，於式（1)中，ζ〇(χ)係由式（2)表示， [數2] ^ k^\ (2χΤ •⑵ (式（2)中， C2=〇·762469824257553 ' C4=0.298075662262927 ' C6=-〇-559629338153661 > C8=0.896468280253265 ' C10 = -〇.6571 641662 137 15、C12 = -〇.61572641 8495985、 ¢^4=1.245 15 1353938560及 C16 = -〇.520559083769482，或 C2=0.828034790338647 、 C4=〇.322164108625275 、 C6 = -〇·6834093 8 84083 5 3 ' C8=1.22 1 645232748 1 40 ' Ci〇 = -l .2043 8 12593372 1 0 ' C ] 2 = -〇. l 40913871787724 ' CM = l.〇33 1 1 0858219420、C16 = -〇.475388345540708，或 C2=〇-908743053413473 ' C4=〇.412136074245729 ' C6=-l.052244441109330 ' C8=1.939746214284020 ' C10 = -2.0133001 1 523 1620 ' C , 2 = 〇.〇74678489261 357 ' Ci4=l 376932293623570 ' C 16 = .0.68008 1 0688 1 5946) <· 於該構成中，第1及第2光控制板係以第1及第2光控制板 158564.doc 201219848 之各者所具有之凸狀部之延伸方向大致正交之方式而配置 於板厚方向上。而且’由於第1及第2光控制板之各者之凸 狀°卩具有由上述z(x)所表示之輪廓形狀，故而於使來自點 狀光源之光入射至光控制板單元之情形時，可進一步實現 來自點狀光源之光之均勻化。 於一實施形態中’可為本發明之光控制板單元更包括於 單面上形成有在一方向上延伸之複數個稜鏡部的第1及第2 稜鏡板；第1及第2光控制板以及第丨及第2稜鏡板係以使第 1及第2光控制板以及第1及第2稜鏡板中之最下方之板成為 第1及第2光控制板中之一者之方式，配置於板厚方向上； 第1稜鏡板所具有之複數個稜鏡部係排列於與該稜鏡部之 延伸方向大致正交之方向上；第2稜鏡板所具有之複數個 稜鏡部係排列於與該稜鏡部之延伸方向大致正交之方向 上，第1稜鏡板所具有之稜鏡部之延伸方向與第2棱鏡板所 具有之稜鏡部之延伸方向大致正交。 於此情形時， 由於更包括如上所述般而配置之2個稜鏡 板’故而於使來自點狀光源之光入射至光控制板單元之情 形時，可進一步實現來自點狀光源之光之均勻化。 於上述形態中’可於第1及第2光控制板之間配置第1及 第2稜鏡板之一者。於此情形時，配置於第丨及第2光控制 板之間之棱鏡板所具有之稜鏡部之延伸方向可與作為最下 方之板之光控制板所具有之凸狀部之延伸方向大致平> 本發明之面光源裝置包括：本發明之光控制板單元^ °以 及複數個點狀光源’其對光控制板單元供給光 該面光源 158564.doc 201219848 裝置中，複數個點狀光源彼此相隔，並且配置於光控制板 單元之背面側。 由於本發明之面光源裝置包含本發明之光控制板單元， 故而可進一步實現來自點狀光源之光之均勻化。 上述點狀光源可設為具有以下第1配光特性或第2配光特 性之點狀光源。 第1配光特性： 其係於將最大出射光強度設為Imax時，與imax相對應之出 射角度為70°以上且80。以下之範圍者，於將出射角度為0。 之情形之出射光強度設為1〇時，1〇滿足 0.12xImax^I0^〇.2〇xImax * 出射光強度為（10+1^,)/2之出射角度為60。以上且70。以下 之範圍，以及，出射光強度為（I〇+Imax)/4之出射角度為 47.5。以上且57.5。以下之範圍。 第2配光特性： 其係於將最大出射光強度設為Imax時，與Imax相對應之出 射角度為65。以上且75。以下之範圍者，於將出射角度為〇。 之情形之出射光強度設為10時，1〇滿足 0.22xlmax^ 1〇^ 〇_30xlmax > 出射光強度為（I0+Imax)/2之出射角度為45。以上且55。以下 之範圍’以及，出射光強度為（I〇+Imax)/4之出射角度為2〇。 以上且30。以下之範圍。 本發明之透過型圖像顯示裝置包括：本發明之面光源裝 置；以及透過型圖像顯示部，其係由自面光源裝置輸出之 158564.doc 201219848 光照射。 由於本發明之透過型圖像顯示裝置包含本發明之面光源 裝置，故而可進一步實現來自點狀光源之光之均勻化。而 且，由於以經均勻化之光照亮透過型圖像顯示部，故而本 發明之透過型圖像顯示裝置可顯示更高品質之圖像。 發明之效果 根據本發明，可提供一種可進一步實現來自點狀光源之 光之均勻化的光控制板單元、面光源裝置、及透過型圖像 顯示裝置。 【實施方式】 以下’參照圖式說明本發明之實施形態。對於相同之要 素附上相同符號，而省略重複之說明。圖式之尺寸比率未 必與所說明者一致。 圖1係模式性地表示本發明之透過型圖像顯示裝置之一 實施形態之構成的剖面圖。圖1係將透過型圖像顯示裝置i 分解表示。 透過型圖像顯示裝置1包括：透過型圖像顯示部1〇、及 於圖1中配置於透過型圖像顯示部10之背面侧之面光源裝 置20。於以下說明中，如圖丄所示，將面光源裝置2〇與透 過型圖像顯示部1〇之排列方向稱為Z方向（板厚方向），將 與Z方向正交且互相正交之2個方向稱為X方向及γ方向。 對透過型圖像顯示部10照射自面光源裝置2〇輸出之光。 透過型圖像顯示部1〇係藉由自面光源裝置2〇照射之光而顯 示圖像。透過型圖像顯示部10之例為例如於液晶單元丨丨之 158564.doc 201219848 兩面配置有直線偏光板12、13之液晶顯示面板。於此情形 時，透過型圖像顯示裝置丨為液晶顯示裝置（或液晶電視）。 作為液晶單元11、偏光板12、13，可使用先前之液晶顯示 裝置等透過型圖像顯示裝置1中所使用者。液晶單元丨丨之 例為TFT(Thin Film Transistor ’薄膜電晶體）型之液晶單 元、STN(Super Twisted Nematic ’超扭轉向列）型之液晶單 元等公知之液晶單元。 面光源裝置20為所謂之直下型面光源裝置。面光源裝置 2〇包含：光控制板單元21、及於圖1中配置於光控制板單 7G 21之背面側（圖i中為下側）之複數個點狀光源22。光控制 板單元21為包含複數片光控制板之複合光控制板。如此， 光控制板21包含複數片光控制板，但於圖1中，光控制板 21係模式性地表示。 圖2係表示複數個點狀光源之配置關係之一例的圖式。 如圖2所示，複數個點狀光源22可於X方向上以等間隔。 及於Y方向上以等間隔Ly進行配置。於圖2中，作為一例， 表示X方向之間隔Lx大於Y方向之間隔Ly之情形。然而， 間隔Ly亦可大於間隔Lx，且間隔Lx及間隔Ly亦可相等。 作為一例，間隔Lx及間隔Ly可設為點狀光源22之發光部間 之距離，通常為10 mm~ 150 mm。 複數個點狀光源22亦可配置為圖3中所示之千鳥格子 狀。由於圖3可視為圖2之情形之變形例，故而可將點狀光 源2 2間之X方向及γ方向之間隔設為與圖2之情形相同。對 圖3中之點狀光源22間之X方向及Y方向之間隔進行具體說 158564.doc -10- 201219848 明。 圖2中所示之長方形格子可視為包含配置於χ方向之複數 個點狀光源22之點狀光源行於γ方向上並列複數個而成 者。於此情形時，圖3之千鳥格子狀之配置係成為排列於γ • 方向上之複數個點狀光源行中之鄰接之點狀光源行於X方 向上錯開半個週期而配置者。由此，於圖3所示之配置 中’ Y方向之間隔Ly亦可設為與圖2中所示之情形相同。 即’ Y方向之間隔Ly可設為並列於γ方向上之上述點狀光 源行之間之間隔。於圖3中，作為一例，表示並列於γ方向 上之上述點狀光源行中之鄰接之點狀光源行於X方向上錯 開半個週期之情形，但於上述說明中亦可將X方向及γ方 向互換。 點狀光源22為所謂之側發射（side emitting)型光源。點狀 光源22之例為發光二極體。點狀光源22可為具有圖4中所 例示之第1配光特性或圖5中所例示之第2配光特性者。圖4 及圖5係分別表示面光源裝置所包含之點狀光源之配光分 佈之一例的圖式。圖4及圖5之橫軸表示出射角度θ(〇χ參照 圖1) ’縱軸表示以最大出射光強度進行標準化所得之標準 化出射光強度。於本實施形態中，θ=0與圖1中之ζ方向相 對應。 圖4中所例示之第1配光特性滿足以下條件。 •於將出射光強度為最大之最大出射光強度設為j 時，與Imax相對應之出射角度h(以下，稱為峰值角度0丨）位 於70。以上且80。以下之範圍内。 158564.doc • 11 - 201219848 之方向）起至峰值角度01為 •自正面方向（出射角度Θ為0。 止出射光強度大致呈單調遞增。201219848 VI. Description of the Invention: [Technical Field] The present invention relates to a light control panel unit, a surface light source device, and a transmissive image display device. [Prior Art] As the direct type image display device 40, which is an example of the transmissive image display device, for example, as shown in Fig. 16, a light source 43 is disposed on the back side of the transmissive image display unit. An example of the transmissive image display unit 1 is, for example, a liquid crystal display panel in which the linear polarizing plates 12 and 13 are disposed on both surfaces of the liquid crystal cell 11. The light source 43 is used by arranging a plurality of linear light sources such as a straight tube type cold cathode ray tube in parallel with each other. As the direct type image display device 4, it is preferable that the light from the light source 43 is uniformly dispersed to uniformly illuminate the transmissive image display portion 10. For this reason, a portion having a function of changing the direction of the light incident from the light source 43 side and emitting the light from the opposite side of the transmissive image display unit 10 side is disposed between the light source 43 and the transmissive image display unit 1A. A light control panel 42 which is called a light-diffusing sheet (for example, see Japanese Patent Laid-Open Publication No. Hei 7-i989i3). Further, since the light output from the light source 43 is emitted as a planar light by the light control panel 42, the light source 43 and the light control panel 42 constitute a surface light source device 41. Prior Art Patent Literature Patent Literature 1: Japanese Patent Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The light-emitting diodes are usually point-like light sources' and the light-emitting diode system is discretely arranged for use. However, if the light control panel included in the previous surface light source device is combined with a point light source such as a light-emitting diode for use in a direct-type image display device, there is a problem in that it cannot be made from a point light source. The light is sufficiently uniform, and the image displayed by the transmissive image display unit is different in brightness near the point light source and at a position separated from the point light source. Accordingly, it is an object of the present invention to provide a light control panel unit, a surface light source device and a transmissive image display device which can further achieve uniformization of light from a skin light source. MEANS FOR SOLVING THE PROBLEMS The light control panel unit of the present invention includes first and second light control panels having a plurality of convex portions extending in one direction on one surface; (a) first and second light control panel systems Arranged in the thickness direction; (b) the plurality of convex portions of the first light control plate are arranged side by side in a direction substantially orthogonal to the extending direction of the convex portion; (c) the second light control panel The plurality of convex portions are arranged side by side in a direction substantially perpendicular to the extending direction of the convex portion; (1) the extending direction of the convex portion of the first light control plate and the second light The extending direction of the convex portion of the control plate is substantially orthogonal; (e) each of the convex portions of the first and second light control plates is substantially orthogonal to the extending direction of the convex portion In the cross section, the axis passing through both ends of the convex portion is set to the X axis, and the axis passing through the center of the both ends on the X axis and orthogonal to the X axis is defined as the z axis, 158564.doc 201219848 When the length of the X-axis direction is set to Wa, the cross-sectional shape of the convex portion is full under the condition of -0.475xwa$ 〇.475xwa. z(x) of the formula (1) represents [1] 0.95xz〇(x)^ z(x)^ 1.05xz〇(x) (1) where, in the formula (1), ζ〇 (χ) is expressed by the formula (2), [number 2] ^ k^\ (2χΤ • (2) (in the formula (2), C2=〇·762469824257553 'C4=0.298075662262927 'C6=-〇-559629338153661 > C8= 0.896468280253265 ' C10 = -〇.6571 641662 137 15, C12 = -〇.61572641 8495985, ¢^4=1.245 15 1353938560 and C16 = -〇.520559083769482, or C2=0.828034790338647, C4=〇.322164108625275, C6 = -〇 ·6834093 8 84083 5 3 ' C8=1.22 1 645232748 1 40 ' Ci〇= -l .2043 8 12593372 1 0 ' C ] 2 = -〇. l 40913871787724 ' CM = l.〇33 1 1 0858219420, C16 = - 475.475388345540708, or C2=〇-908743053413473 ' C4=〇.412136074245729 ' C6=-l.052244441109330 ' C8=1.939746214284020 ' C10 = -2.0133001 1 523 1620 ' C , 2 = 〇.〇74678489261 357 ' Ci4=l 376932293623570 'C 16 = .0.68008 1 0688 1 5946) <· In this configuration, the first and second light control plates are convex portions each of the first and second light control plates 158564.doc 201219848 Extension The embodiment is arranged substantially perpendicular to the thickness direction. Further, since the convex shape of each of the first and second light control plates has a contour shape represented by the above z(x), when the light from the point light source is incident on the light control panel unit, The uniformization of light from the point source can be further achieved. In one embodiment, the light control panel unit of the present invention further includes first and second jaws formed on a single surface with a plurality of flanges extending in one direction; first and second light control panels And the second and second slabs are arranged such that the first and second light control boards and the lowermost one of the first and second slabs are one of the first and second light control boards. In the direction of the plate thickness; the plurality of crotch portions of the first crotch plate are arranged in a direction substantially orthogonal to the direction in which the crotch portion extends; and the plurality of crotch portions of the second crotch plate are arranged In a direction substantially perpendicular to the extending direction of the weir portion, the extending direction of the weir portion of the first jaw is substantially perpendicular to the extending direction of the weir portion of the second prism sheet. In this case, since the two slabs arranged as described above are further included, when the light from the point light source is incident on the light control panel unit, the uniformity of light from the point light source can be further realized. Chemical. In the above aspect, one of the first and second jaws may be disposed between the first and second light control panels. In this case, the direction in which the ridge portion of the prism plate disposed between the second and second light control plates extends may be substantially the same as the direction in which the convex portion of the light control plate serving as the lowermost plate extends. The surface light source device of the present invention comprises: the light control panel unit of the present invention and a plurality of point light sources which supply light to the light control panel unit. The surface light source is 158564.doc 201219848 In the device, a plurality of point light sources They are spaced apart from each other and are disposed on the back side of the light control panel unit. Since the surface light source device of the present invention includes the light control panel unit of the present invention, the uniformization of light from the point light source can be further achieved. The point light source may be a point light source having the following first light distribution characteristics or second light distribution characteristics. First light distribution characteristic: When the maximum emitted light intensity is Imax, the emission angle corresponding to imax is 70° or more and 80. In the following range, the exit angle is 0. In the case where the outgoing light intensity is set to 1 ,, 1 〇 satisfies 0.12xImax^I0^〇.2〇xImax * The outgoing light intensity is (10+1^,)/2 and the exit angle is 60. Above and 70. The following range, and the exiting light intensity (I 〇 + Imax) / 4, the exit angle is 47.5. Above and 57.5. The following range. Second light distribution characteristic: When the maximum emitted light intensity is Imax, the emission angle corresponding to Imax is 65. Above and 75. In the following range, the exit angle is 〇. In the case where the outgoing light intensity is set to 10, 1〇 satisfies 0.22xlmax^1〇^ 〇_30xlmax > The outgoing light intensity is (I0+Imax)/2 and the exit angle is 45. Above and 55. The following range 'and the exit angle of the emitted light intensity (I 〇 + Imax) / 4 are 2 〇. Above and 30. The following range. The transmissive image display device of the present invention comprises: the surface light source device of the present invention; and a transmissive image display portion which is irradiated with light from a surface light source device of 158564.doc 201219848. Since the transmissive image display device of the present invention includes the surface light source device of the present invention, the uniformization of light from the point light source can be further achieved. Further, since the transmissive image display portion is illuminated by the uniformized light, the transmissive image display device of the present invention can display a higher quality image. Advantageous Effects of Invention According to the present invention, it is possible to provide a light control panel unit, a surface light source device, and a transmissive image display device which can further realize uniformization of light from a point light source. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same symbols are attached to the same elements, and overlapping descriptions are omitted. The dimensional ratios of the drawings are not necessarily consistent with those described. Fig. 1 is a cross-sectional view schematically showing a configuration of an embodiment of a transmissive image display device of the present invention. Fig. 1 is an exploded representation of a transmissive image display device i. The transmissive image display device 1 includes a transmissive image display unit 1A and a surface light source device 20 disposed on the back side of the transmissive image display unit 10 in Fig. 1 . In the following description, as shown in FIG. ,, the direction in which the surface light source device 2A and the transmissive image display unit 1 are arranged is referred to as the Z direction (plate thickness direction), and is orthogonal to the Z direction and orthogonal to each other. The two directions are called the X direction and the γ direction. The transmissive image display unit 10 is irradiated with light output from the surface light source device 2〇. The transmissive image display unit 1 displays an image by light irradiated from the surface light source device 2 . An example of the transmissive image display unit 10 is a liquid crystal display panel in which linear polarizing plates 12 and 13 are disposed on both sides of a liquid crystal cell, for example, 158564.doc 201219848. In this case, the transmissive image display device is a liquid crystal display device (or a liquid crystal television). As the liquid crystal cell 11, the polarizing plates 12, 13, a user of the transmissive image display device 1 such as a liquid crystal display device of the prior art can be used. The liquid crystal cell is exemplified by a known liquid crystal cell such as a TFT (Thin Film Transistor) film type liquid crystal cell or an STN (Super Twisted Nematic' type) liquid crystal cell. The surface light source device 20 is a so-called direct type surface light source device. The surface light source device 2A includes a light control panel unit 21 and a plurality of point light sources 22 disposed on the back side (the lower side in Fig. i) of the light control panel 7G 21 in Fig. 1 . The light control panel unit 21 is a composite light control panel including a plurality of light control panels. Thus, the light control panel 21 includes a plurality of light control panels, but in Fig. 1, the light control panel 21 is schematically shown. Fig. 2 is a view showing an example of an arrangement relationship of a plurality of point light sources. As shown in FIG. 2, a plurality of point light sources 22 may be equally spaced in the X direction. And arranged at equal intervals Ly in the Y direction. In FIG. 2, as an example, the case where the interval Lx in the X direction is larger than the interval Ly in the Y direction is shown. However, the interval Ly may be greater than the interval Lx, and the interval Lx and the interval Ly may be equal. As an example, the interval Lx and the interval Ly may be the distance between the light-emitting portions of the point light source 22, and are usually 10 mm to 150 mm. The plurality of point light sources 22 may also be arranged in the shape of a thousand bird grid as shown in FIG. Since Fig. 3 can be regarded as a modification of the case of Fig. 2, the interval between the X direction and the γ direction between the point light sources 2 can be made the same as in the case of Fig. 2. The interval between the X-direction and the Y-direction between the point-like light sources 22 in Fig. 3 is specifically described as 158564.doc -10- 201219848. The rectangular lattice shown in Fig. 2 can be regarded as a point in which a plurality of point light sources 22 arranged in a plurality of point light sources 22 arranged in the x direction are arranged in parallel in the γ direction. In this case, the arrangement of the thousands of bird-like grids in Fig. 3 is such that the adjacent point-shaped light source rows among the plurality of point-shaped light source rows arranged in the γ• direction are arranged in the X direction by a half cycle. Therefore, the interval of the Y direction in the arrangement shown in Fig. 3 can also be set to be the same as that shown in Fig. 2. That is, the interval Ly in the Y direction can be set as the interval between the above-mentioned dot-shaped light source rows juxtaposed in the γ direction. In FIG. 3, as an example, the adjacent point light source rows in the point light source row juxtaposed in the γ direction are shifted by half a cycle in the X direction, but in the above description, the X direction may be The gamma direction is interchanged. The point light source 22 is a so-called side emitting type light source. An example of the point light source 22 is a light emitting diode. The point light source 22 may have the first light distribution characteristic illustrated in Fig. 4 or the second light distribution characteristic illustrated in Fig. 5. 4 and 5 are views each showing an example of a light distribution of a point light source included in the surface light source device. The horizontal axis of Figs. 4 and 5 indicates the emission angle θ (〇χ, Fig. 1). The vertical axis indicates the normalized emitted light intensity obtained by normalization with the maximum emitted light intensity. In the present embodiment, θ = 0 corresponds to the ζ direction in Fig. 1 . The first light distribution characteristic illustrated in Fig. 4 satisfies the following conditions. • When the maximum outgoing light intensity at which the intensity of the emitted light is the maximum is j, the exit angle h (hereinafter referred to as the peak angle 0丨) corresponding to Imax is at 70. Above and 80. Within the scope below. 158564.doc • 11 - 201219848 direction) to peak angle 01 is • From the front direction (exit angle Θ is 0. The intensity of the exiting light is approximately monotonically increasing.
0.12xlmax^ I〇^ 0.20xlmax 〇0.12xlmax^ I〇^ 0.20xlmax 〇
70°以下之範圍内。Within the range of 70° or less.
且57.5°以下之範圍内。And within the range of 57.5 ° or less.
強度，故而 Imax=l.〇〇〇〇〇, 匕中’由於縱軸為標準化出射光 對應之出射角度01為76 8。。1〇為 0.140。於此情形時，（Imax+I〇)/2=〇57〇,對應之出射角度 θ2為66.5。。又’（Imax+I0)/4=〇.285，對應之出射角度θ3為 52_5 。由此，圖4中所示之點狀光源22之配光特性滿足上 述條件。 又’圖5中所例示之第2配光特性滿足以下條件。 •峰值角度Θ〗位於65。以上且75。以下之範圍内。 •自正面方向（出射角度Θ為0。之方向）起至锋值角度01為 止出射光強度大致呈單調遞增。 •正面方向之出射光強度10滿足 0.22><1„^1〇$0.30乂1_。 •出射光強度為（Imax十1〇)/2之出射角度θ2位於45。以上且 55°以下之範圍内。 •出射光強度為（Imax+I〇)/4之出射角度θ3位於20°以上且 30°以下之範圍内。 I58564.doc -12· 201219848 於圖5所例示之配光特性中，由於縱軸為標準化出射光 強度，故而imax=i.o〇〇〇〇 ’對應之出射角度e丨為約70〇。 為0.265。於此情形時’（Imax+I〇)/2=0.634，對應之出射角 度θ2為約49。。又’（Imax+I〇)/4=0.317，對應之出射角度θ3 為約25。。由此，圖5中所示之點狀光源22之配光特性滿足 上述條件。 其次’說明光控制板單元21 ^光控制板單元21可包括4 片之第1光控制板30,、第2光控制板302、第3光控制板3〇3 及第4光控制板304。 第1〜第4光控制板3(^-304之俯視形狀（自ζ方向觀察到之 形狀）大致相同，通常為長方形。第1〜第4光控制板3〇1〜3〇4 之俯視形狀，換言之’光控制板單元21之俯視形狀之尺寸 係以適合於目標之透過型圖像顯示裝置1之畫面尺寸之方 式進行選擇。第1〜第4光控制板30广3〇4之俯視形狀之尺寸 通常為250 mmx440 mm以上，較佳為1〇20 mmxISOO mm以 下。第1〜第4光控制板30^304之俯視形狀並不限定為長方 形’亦可為正方形。於以下說明中，只要未作特別說明， 則第1〜第4光控制板3(^-304之俯視形狀為長方形。 就第1〜第4光控制板30^304之配置順序而言，包含第^ 第4光控制板30^304之光控制板單元2丨包含3個實施形態。 以下，說明光控制板單元21之第1〜第3實施形態。第丨〜第3 實施形態中之光控制板單元2丨係分別稱為光控制板單元 21A、光控制板單元21B及光控制板單元21匸。 (光控制板單元21A) 158564.doc -13- 201219848 圖6係用以表示光控制板單元之一實施形態之構成之立 體圖。參照表示有光控制板單元21A之圖6，說明於光控制 板單元21A~21C中共通之第卜第4光控制板3〇ι、3〇2、 3〇3、3〇4。於圖6中，為進行說明，而將第丨〜第4光控制板 3〇,〜3〇4隔開配置，但如下所述，亦可於第【光控制板3〇1上 將第2〜第4光控制板3〇2〜3〇4以使鄰接之2片接觸之方式進 行設置。 [第1光控制板] 第1光控制板30,為如下板狀體，即包含：大致平坦之下 表面（第1光控制板之第1面）3 1〗、及於第2光控制板3 〇2側形 成有複數個凸起即凸狀部（第丨光控制板之凸狀部）33ι之上 表面（第1光控制板之第2面）32丨。 第1光控制板3 0!係例如使光根據來自凸狀部3 3丨之光之出 射位置之差異而分散之光擴散板。由於第1光控制板3〇1係 根據來自凸狀部33丨之光之出射位置而使光之出射方向偏 向，故而亦可稱為賦予了調整光之偏向之形狀的偏向構造 板。此處，雖然將第1光控制板3〇1稱為「板」，但第1光控 制板304¾據厚度亦可為片狀及膜狀。 凸狀部33丨沿與丫方向大致平行iY1方向（第1光控制板之 第1方向）延伸》複數個凸狀部33】係並列配置於與Y1方向 大致正交之X1方向（第1光控制板之第2方向）上。XI方向及 Y1方向較佳為分別與X方向及Y方向平行’但XI方向及Y1 方向亦可分別因例如製造誤差等而自X方向及Y方向偏移 ±10°左右°複數個凸狀部331之刮面形狀係於凸狀部33 158564.doc 201219848 大致相同。於凸狀部33l之延伸方向上，凸狀部33ι之剖面 形狀大致均勻。鄰接之2個凸狀部33ι、33丨之端部33〜於幻 方向上位於相同之位置。第丨光控制板3〇1之厚度…為下表 面31丨與凸狀部33ι之頂部33b〗iZ方向上之距離，且厚度山 通常為0.1 mm〜5 mm 〇 [第2光控制板] 第2光控制板3〇2為如下板狀體，即包含：大致平坦之下 表面（第2光控制板之第1面）3丨2、及於外側形成有複數個凸 起即凸狀部（第2光控制板之凸狀部）332之上表面（第2光控 制板之第2面）322。第2光控制板3〇2與第1光控制板3〇1同樣 地為光擴散板’且亦可稱為偏向構造板。此處，雖然將第 2光控制板3〇2稱為「板」，但第2光控制板3〇2根據厚度亦可 為片狀及膜狀。 凸狀部3 32沿與X方向大致平行之X 2方向（第2光控制板之 第1方向）延伸。複數個凸狀部3 32係並列配置於與χ2方向 大致正交之Y2方向（第2光控制板之第2方向）上。X2方向及 Y2方向較佳為分別與X方向及γ方向平行，但與第1光控制 板3(^之情形同樣地，X2方向及Y2方向亦可分別因例如製 造誤差等而自X方向及Y方向偏移±1〇。左右。複數個凸狀 部332之剖面形狀係於凸狀部332間大致相同。又，於凸狀 部332之延伸方向上’凸狀部33z之剖面形狀大致均勻。鄰 接之2個凸狀部332、332之端部33az、33a2於Y2方向上位於 相同之位置。第2光控制板3〇2之厚度&為下表面3丨2與凸狀 部33s之頂部33t>2之Z方向上之距離，且厚度h通常為〇1 158564.doc •15- 201219848 mm〜5 mm ° [第3光控制板] 第3光控制板（第1稜鏡板）3 〇3為如下板狀體，即包含：大 致平坦之下表面（第3光控制板之第1面）313、及於外側形成 有複數個凸起即凸狀部（第3光控制板之凸狀部）333之上表 面（第3光控制板之第2面）323。凸狀部333係剖面為三角形 狀之稜鏡部’且第3光控制板3〇3為所謂之棱鏡板。此處， 雖然將第3光控制板3〇3稱為「板」，但第3光控制板3〇3根據 厚度亦可為片狀及膜狀。 凸狀部3 33沿與Y方向大致平行之γ 3方向（第3光控制板之 第1方向）延伸。複數個凸狀部3 33係並列配置於與Υ3方向 大致正交之X3方向（第3光控制板之第2方向）上β χ3方向及 Y3方向較佳為分別與X方向及γ方向平行，但與第1光控制 板301之情形同樣地，χ3方向及γ]方向亦可分別因例如製 造誤差等而自X方向及γ方向偏移士 1〇。左右。複數個凸狀 部333之刮面形狀係於凸狀部333間大致相同。於凸狀部333 之延伸方向上’凸狀部333之剖面形狀大致均勻。鄰接之2 個凸狀部33s、333之端部33as、33a3於X3方向上位於相同 之位置。第3光控制板3〇3之厚度d3為下表面313與凸狀部 3 33之頂部33b3之Z方向上之距離，且厚度“通常為〇1 mm〜5 mm ° [第4光控制板] 第4光控制板（第2稜鏡板）3〇4為如下板狀體，即包含：大 致平坦之下表面（第4光控制板之第1面）314、及於外側形成 158564.doc -16 - 201219848 有複數個凸起即凸狀部（第4光控制板之凸狀部）334之上表 面（第4光控制板之第2面）324。凸狀部334係剖面為三角形 狀之稜鏡部。第4光控制板3〇4與第3光控制板3〇3同樣地為 所謂之稜鏡板。此處雖然將第4光控制板3〇4稱為「板」， 但第4光控制板3〇4根據厚度亦可為片狀及膜狀。 凸狀部334沿與X方向大致平行之又4方向（第4光控制板之 第1方向）延伸。複數個凸狀部334係並列配置於與又4方向 大致正交之Y4方向（第4光控制板之第2方向）上β χ4方向及 Υ4方向較佳為分別與Χ方向及γ方向平行，但與第丨光控制 板30,之情形同樣地，X4方向及丫4方向亦可分別因例如製 造誤差等而自X方向及γ方向偏移±1〇。左右。複數個凸狀 部334之剖面形狀係於凸狀部334間大致相同。又，於凸狀 部334之延伸方向上，凸狀部之剖面形狀大致均勻。鄰 接之2個凸狀部33p 334之端部33a4、33〜於Y4方向上位於 相同之位置。第4光控制板3〇4之厚度&為下表面3“與凸狀 部334之頂部331η之Z方向上之距離，且厚度^通常為〇1 mm〜5 mm 〇 [第1及第2光控制板之凸狀部] 對第1及第2光控制板3〇i、3〇2之各者所具有之凸狀部 33丨、33,之形狀進行說明。此處，只要未作特別說明，則 凸狀部331、332係稱為凸狀部33心為1或2)。於圖7中，將 與凸狀部之延伸方向正交之方向設為χ軸而設定^座標 系統。與凸狀部33!及凸狀部33z相對應之乂軸方向分別為 XI方向及Y2方向。與凸狀部331及凸狀部％相對應之z轴 158564.doc •17· 201219848 方向均為z方向》 於該xz座標系統之xz面上，凸狀部33i之兩端33a.、 1 w d ΐ 係位於X軸上，且凸狀部33i之剖面中之輪廓形狀（剖面形 狀）係由滿足式（3)之z(x)表示， [數3] 〇·95χζ〇(χ)^ z(x)^ 1.05xz〇(x)...(3) 其中’於式（3)中，ζ0(χ)滿足式（4)， [數4]Intensity, therefore, Imax = l. 〇〇〇〇〇, 匕 in the 由于" because the vertical axis is the normalized outgoing light, the corresponding exit angle 01 is 76 8 . . 1〇 is 0.140. In this case, (Imax + I 〇) / 2 = 〇 57 〇, and the corresponding exit angle θ 2 is 66.5. . Further, '(Imax+I0)/4=〇.285, the corresponding exit angle θ3 is 52_5. Thereby, the light distribution characteristics of the point light source 22 shown in Fig. 4 satisfy the above conditions. Further, the second light distribution characteristics exemplified in Fig. 5 satisfy the following conditions. • The peak angle Θ is at 65. Above and 75. Within the scope below. • From the front direction (the direction of the exit angle Θ is 0.) to the front angle 01, the intensity of the exit light is approximately monotonically increasing. • The outgoing light intensity 10 in the front direction satisfies 0.22><1„^1〇$0.30乂1_. • The outgoing light intensity is (Imax 1:1)/2 The exit angle θ2 is in the range of 45 or more and 55° or less. • The exit angle θ3 of the emitted light intensity (Imax+I〇)/4 is in the range of 20° or more and 30° or less. I58564.doc -12· 201219848 In the light distribution characteristics illustrated in Fig. 5, The vertical axis is the normalized outgoing light intensity, so the exit angle e丨 corresponding to imax=io〇〇〇〇' is about 70 〇. It is 0.265. In this case, '(Imax+I〇)/2=0.634, corresponding to the exit The angle θ2 is about 49. Further, '(Imax+I〇)/4=0.317, and the corresponding exit angle θ3 is about 25. Thus, the light distribution characteristics of the point light source 22 shown in Fig. 5 satisfy the above conditions. Next, the light control panel unit 21 can be included. The light control panel unit 21 can include four first light control panels 30, a second light control panel 302, a third light control panel 3〇3, and a fourth light control panel 304. The first to fourth light control plates 3 (the shape of the ^-304 in plan view (the shape viewed from the x direction) are substantially the same, and are generally rectangular. The first to fourth light controls The top view shape of the 3〇1 to 3〇4, in other words, the size of the planar shape of the light control panel unit 21 is selected so as to be suitable for the screen size of the target transmissive image display device 1. The first to fourth lights The size of the planar shape of the control panel 30 is generally 250 mm x 440 mm or more, preferably 1 〇 20 mm x ISOO mm or less. The shape of the first to fourth light control plates 30 ^ 304 is not limited to a rectangular shape. In the following description, unless otherwise specified, the first to fourth light control plates 3 (the shape of the ^-304 in plan view are rectangular. The arrangement order of the first to fourth light control plates 30^304) The light control panel unit 2A including the fourth light control panel 30^304 includes three embodiments. Hereinafter, the first to third embodiments of the light control panel unit 21 will be described. The third to third embodiments are described. The light control panel unit 2 in the form is referred to as a light control panel unit 21A, a light control panel unit 21B, and a light control panel unit 21A, respectively. (Light control panel unit 21A) 158564.doc -13- 201219848 Fig. 6 is used A perspective view showing a configuration of an embodiment of a light control panel unit. FIG. 6 showing the light control panel unit 21A illustrates the fourth light control panels 3〇, 3〇2, 3〇3, and 3〇4 common to the light control panel units 21A to 21C. For the sake of explanation, the second to fourth light control panels 3 〇, 〜3 〇 4 are arranged separately, but as described below, the second to fourth light may be applied to the light control panel 3〇1. The control boards 3〇2 to 3〇4 are arranged in such a manner that two adjacent sheets are in contact with each other. [First Light Control Plate] The first light control plate 30 is a plate-like body including a substantially flat lower surface (first surface of the first light control plate) 3 1 and a second light control plate. 3 〇 2 side is formed with a plurality of protrusions, that is, a convex portion (the convex portion of the second light control panel) 33 ι upper surface (the second surface of the first light control plate) 32 丨. The first light control plate 30 is, for example, a light diffusion plate in which light is dispersed in accordance with the difference in the emission position of the light from the convex portion 33. Since the first light control plate 3〇1 deflects the light emission direction in accordance with the emission position of the light from the convex portion 33丨, it may be referred to as a deflection structural plate to which the shape of the adjustment light is deflected. Here, the first light control plate 3〇1 is referred to as a “plate”, but the first light control plate 3043 can be formed into a sheet shape or a film shape depending on the thickness. The convex portion 33 is extended in the iY1 direction (the first direction of the first light control plate) substantially parallel to the 丫 direction. The plurality of convex portions 33 are arranged side by side in the X1 direction substantially perpendicular to the Y1 direction (the first light) In the second direction of the control panel). The XI direction and the Y1 direction are preferably parallel to the X direction and the Y direction, respectively, but the XI direction and the Y1 direction may also be shifted by ±10° from the X direction and the Y direction due to, for example, manufacturing errors, etc., a plurality of convex portions. The shape of the scraped surface of 331 is substantially the same as that of the convex portion 33 158564.doc 201219848. The cross-sectional shape of the convex portion 33i is substantially uniform in the extending direction of the convex portion 33l. The end portions 33 of the adjacent two convex portions 33, 33, 〜 are located at the same position in the phantom direction. The thickness of the third light control panel 3〇1 is the distance between the lower surface 31丨 and the top 33b of the convex portion 33i in the iZ direction, and the thickness mountain is usually 0.1 mm to 5 mm 〇 [2nd light control panel] The light control plate 3〇2 is a plate-like body including a substantially flat lower surface (the first surface of the second light control plate) 3丨2, and a plurality of convex portions, that is, convex portions are formed on the outer side ( The upper surface (the second surface of the second light control plate) 322 of the convex portion 332 of the second light control plate. Similarly to the first light control plate 3〇1, the second light control plate 3〇2 is a light diffusion plate ′ and may also be referred to as a deflection structure plate. Here, the second light control plate 3〇2 is referred to as a “plate”, but the second light control plate 3〇2 may have a sheet shape or a film shape depending on the thickness. The convex portion 3 32 extends in the X 2 direction (the first direction of the second light control plate) substantially parallel to the X direction. The plurality of convex portions 3 32 are arranged side by side in the Y2 direction (the second direction of the second light control plate) substantially perpendicular to the direction of the χ2. The X2 direction and the Y2 direction are preferably parallel to the X direction and the γ direction, respectively. However, similarly to the case of the first light control panel 3, the X2 direction and the Y2 direction may be from the X direction due to, for example, manufacturing errors. The Y direction is shifted by ±1〇. The cross-sectional shape of the plurality of convex portions 332 is substantially the same between the convex portions 332. Further, the cross-sectional shape of the convex portion 33z is substantially uniform in the extending direction of the convex portion 332. The end portions 33az and 33a2 of the adjacent two convex portions 332 and 332 are located at the same position in the Y2 direction. The thickness & the second light control plate 3〇2 is the lower surface 3丨2 and the convex portion 33s. The distance in the Z direction of the top 33t>2, and the thickness h is usually 〇1 158564.doc •15-201219848 mm~5 mm ° [3rd light control panel] 3rd light control panel (1st seesaw) 3 〇 3 is a plate-like body including a substantially flat lower surface (the first surface of the third light control plate) 313 and a plurality of convex portions, that is, convex portions (the convex portion of the third light control plate) is formed on the outer side. The upper surface of the portion 333 (the second surface of the third light control plate) 323. The convex portion 333 is a triangular portion having a triangular cross section and the third light control The plate 3〇3 is a so-called prism plate. Here, the third light control plate 3〇3 is referred to as a “plate”, but the third light control plate 3〇3 may have a sheet shape or a film shape depending on the thickness. The portion 3 33 extends in the γ 3 direction (the first direction of the third light control plate) substantially parallel to the Y direction. The plurality of convex portions 3 33 are arranged side by side in the X3 direction substantially orthogonal to the Υ3 direction (third In the second direction) of the light control plate, the β χ 3 direction and the Y 3 direction are preferably parallel to the X direction and the γ direction, respectively. However, similarly to the case of the first light control plate 301, the χ3 direction and the γ] direction may be different. For example, a manufacturing error or the like is shifted from the X direction and the γ direction by about 1 〇. The shape of the scraping surface of the plurality of convex portions 333 is substantially the same between the convex portions 333. The convex portion 333 is convex in the extending direction. The cross-sectional shape of the portion 333 is substantially uniform. The end portions 33as and 33a3 of the adjacent two convex portions 33s and 333 are located at the same position in the X3 direction. The thickness d3 of the third light control plate 3〇3 is the lower surface 313 and The distance in the Z direction of the top portion 33b3 of the convex portion 3 33, and the thickness "usually 〇1 mm to 5 mm ° [fourth light control panel] fourth light The plate (second raft) 3〇4 is a plate-like body including a substantially flat lower surface (the first surface of the fourth light control plate) 314, and a 158564.doc -16 - 201219848 The upper surface (the second surface of the fourth light control plate) 324 of the plurality of protrusions, that is, the convex portion (the convex portion of the fourth light control plate) 334. The convex portion 334 has a triangular cross section. Similarly to the third light control plate 3〇3, the fourth light control plate 3〇4 is a so-called seesaw. Here, the fourth light control plate 3〇4 is referred to as a “plate”, but the fourth light control plate 3〇4 may have a sheet shape or a film shape depending on the thickness. The convex portion 334 extends in four directions (the first direction of the fourth light control plate) which are substantially parallel to the X direction. The plurality of convex portions 334 are arranged side by side in the Y4 direction (the second direction of the fourth light control plate) substantially orthogonal to the four directions, and the β χ 4 direction and the Υ 4 direction are preferably parallel to the Χ direction and the γ direction, respectively. However, similarly to the case of the third light control panel 30, the X4 direction and the 丫4 direction may be shifted by ±1 自 from the X direction and the γ direction, for example, due to manufacturing errors or the like. about. The cross-sectional shape of the plurality of convex portions 334 is substantially the same between the convex portions 334. Further, the cross-sectional shape of the convex portion is substantially uniform in the extending direction of the convex portion 334. The end portions 33a4, 33 of the two adjacent convex portions 33p 334 are located at the same position in the Y4 direction. The thickness & of the fourth light control plate 3〇4 is the distance from the lower surface 3" to the Z direction of the top portion 331n of the convex portion 334, and the thickness ^ is usually 〇1 mm to 5 mm 〇 [1st and 2nd The convex portion of the light control plate] The shape of the convex portions 33A and 33 of each of the first and second light control plates 3〇i and 3〇2 will be described. In addition, the convex parts 331 and 332 are called the convex part 33, and the core is 1 or 2). In FIG. 7, the direction orthogonal to the extending direction of the convex part is set as the x-axis, and the coordinate system is set. The z-axis directions corresponding to the convex portion 33 and the convex portion 33z are the XI direction and the Y2 direction, respectively, and the z-axis corresponding to the convex portion 331 and the convex portion % is 158564.doc • 17· 201219848 z direction" on the xz plane of the xz coordinate system, the ends 33a., 1 wd of the convex portion 33i are located on the X-axis, and the contour shape (sectional shape) in the cross section of the convex portion 33i is satisfied. The z(x) of the formula (3) represents, [number 3] 〇·95χζ〇(χ)^ z(x)^ 1.05xz〇(x)...(3) where 'in equation (3), ζ0 (χ) satisfies the formula (4), [number 4]
式（4)中’ wa為凸狀部33丨之\轴方向之長度。於式（4)中對 於 k=卜 8 之各者之 C2、C4、C6、C8、q。、Ci2、a* 及 cm 之 組合可為圖8(a)、圖8(b)及圖8(c)中分別所示之圖表之任一 者。 於圖7中’表示與圖8(a)中所示之C2、C4、、&、 C ! ο、c ! 2、C丨4及C ! 6之組合相對應之z(x)。例示有圖7中所 示之凸狀部33;之剖面形狀係於滿足式（3)之範圍内將ζ〇(χ) 於Ζ方向上僅伸縮特定倍率（例如丨倍）所得之形狀。於此情 形時’凸狀部33i具有相對於ζ軸對稱之剖面形狀。 凸狀部33;之剖面形狀並不限定於將ζ〇(χ)κΖ方向上僅伸 縮特定倍率（例如1倍）所得之形狀，凸狀部33i之剖面形狀 係只要滿足式（3)即可。於式（3)中ζ(χ)係如圖9所示般，於 對於某種寬度wa決定ζ〇(χ)時，只要為由通過以〇 95χ〜(χ) 158564.doc •18· 201219848 所表示之輪廓線、與以i心Zq(x)所表示之輪廊線之間之 區域的輪廓線所表示之剖面形狀即可。換言之，式⑺中， 相對於任意之位置u z(Xn)與值置χη上之凸狀部％之高度 相對應。由此，相對於任意之位置…⑹係只要滿足 〇.95z〇(xn)以上且i.〇5z〇(Xn)以下即可。 如上所述般對於式（4)ik=1〜8之各者之。、C4、c6、 c8、C丨0、Cl2、匚^及匚丨6之組合並不限定於圖8(a)中所示6之 組合，亦可為圖8(b)及圖8(c)中所示之組合。 圖H)係表示對於圖8⑻中所示之之組合之z⑷之 一例的圖式。於圖10中’為了表示ζ(χ)所滿足之條件，而 與圖9同樣地’以-點鍵線表示以〇95χζ。⑷所表示之輪廊 線、與以1.05%⑻所表示之輪廓線。基於圖咐）中所示之 C2〜Cl6之組合之剖面形狀亦只要為由通過以〇 所 表示之輪廓線、與以所表示之輪扉線之間之區 域的輪廓線所表示之剖面形狀即可。 圖11係表示對於圖8⑷中所示之C2〜C 16之組合之z⑷之一 例的圖式。於圖"中，為了表示賴滿足之條件，而盘 圖9同樣地，以一點鏈線表示以〇95χζ〇(χ)所表示之輪廟 線、與以1.05xz〇(x)所表示之輪廓線。基於圖8〇)中所示之 C2〜cle之組合之剖面形狀亦只要為由通過以〇.95χζ〆^所 表示之輪廓線、與以i.OSxzMx)所表示之輪廓線之間之區 域的輪廓線所表示之剖面形狀即可。 作為凸狀部33i之寬度wa，就容易形成凸狀部33j之方面 而言，通常為40 μιη以上，較佳為8〇 μηι以上，就由凸狀部 158564.doc •19· 201219848 33j所引起之圖案難以由肉眼視認之方面而言，通常為8〇〇 μιη以下，較佳為450 μιη以下。寬度Wa之具體例包含41〇 μιη、400 μπι、325 μιη、280 μιη及 100 μηι。然而，Wa之值 並不限定於此。 上述說明中，凸狀部33丨之剖面形狀係由滿足式（3)之ζ(χ) 表示。然而’凸狀部33;之剖面形狀係只要於_〇 475xWa$x$ 0.475xwa之條件下由滿足式（3)之ζ(χ)表示即可。其原因在 於，於凸狀部33i之下端附近（端部附近）成形誤差具有相對 變大之傾向，另一方面，下端附近之形狀對光之擴散性所 造成之影響較小。 雖然凸狀部33 凸狀部332之剖面形狀亦可相同，但凸 狀部33 !及凸狀部332之剖面形狀係只要為分別獨立地由滿 足式（3)之z(x)所表示之形狀即可。 [第3及第4光控制板之凸狀部] 對第3及第4光控制板3〇3、3〇4所具有之凸狀部333、334 之剖面形狀進行說明。此處’只要未作特別說明，則凸狀 部33〕、334係稱為凸狀部33j(j為3或4)。圖12係用以說明凸 狀部33』之形狀之圖式。圖12係表示自凸狀部3 3』之延伸方 向觀察之情形之側面的圖式。由於凸狀部33j為於延伸方向 上大致均勻之形狀’故而如圖12所示，自延伸方向觀察到 之側面形狀與大致正交於凸狀部33』之延伸方向之剖面形狀 相對應。 凸狀部33』之側面形狀（或剖面形狀）係頂角α為大致直角 之大致直角三角形，較佳為構成頂角之二邊之長度大致相 158564.doc -20· 201219848 等的大致等腰直角三角形。雖然頂^較佳為9〇。，但尸要 為8〇。〜1〇〇。之範圍即可。鄰接之2個凸狀部33』、33」之間距 P係可例示10叫〜1000 μηι，較佳為20 μιη〜5〇〇叩二佳 為40 μιη〜250 μιη。凸狀部33j之寬度可以使凸狀部33j之間 距P為上述範圍之特定值之方式進行設定。 [第1〜第4光控制板之層構成] 、第1:第4光控制板3〇1〜3〇4既可為由單獨之透明材料所構 成之單層亦可為積層由互相不同之透明材料所構成之 層而形成之多層構造之多層。於第i〜第4光控制板 3〇ι〜304為多層板之情形時，第j〜第4光控制板3〇i〜％之單 面或兩面較佳為形成有通常為1G μιη，較佳為⑽ μηι 100 μηι之厚度之表層的構造。於此情形時，較佳為使 用添加有条外線吸收劑者作為構成表層之透明樹脂材料。 藉由D又為上述構成，可防止由有時來自點狀光源22或外部 之光中所含有之紫外線所導致之第丨〜第4光控制板3〇1〜3〇4 之劣化。尤其於使用紫外線所占比例相對較大者作為點狀 光源22之情形時，就可防止紫外線所導致之劣化之方面而 言，較佳為於下表面31l〜3l4上形成有表^，糾就成本方 面而a，更佳為於上表面％〜324上不形成表層。於使用添 力有紫外線吸收劑者作為構成表層之透明樹脂材料之情形 時，i外線吸收劑之含量以透明樹脂材料為基準通常為 0.5質量％〜5質量％，較佳為}質量$質量％。 亦可於第1〜第4光控制板3〇1〜3〇4之單面或兩面塗佈抗靜 電劑。藉由塗佈抗靜電劑’可防止由靜電所導致之灰塵之 158564.doc -21 . 201219848 附著4，且可防止由灰塵之附著所導致之光線透過率之下 降。 為降低疊紋而可將點狀光源22側之面設為具有光擴散性 之面。例如，既可如上所述般由含有被稱為粗化劑之微細 粒子之表層構成點狀光源22側之面，亦可對點狀光源22側 之面實施壓紋加工、喷射加工，且亦可塗佈含有粗化劑及 黏合劑之塗佈液而形成消光層。 [構成材料] 第1〜第4光控制板3 〇广3 〇4包含透明材料。透明材料之折 射率通常為！.46〜1.62。透明材料之例包含透明樹脂材料、 透明玻璃材料。透明樹脂材料之例包含聚碳酸酯樹脂（折 射率.1.59)、MS(Methylmethacrylate Styrene)樹脂（甲基 丙烯酸甲酯·苯乙烯共聚物樹脂）（折射率：156〜159)、聚 苯乙烯樹脂（折射率：1.59)、AS(ACryl〇nitrile Styrene)樹 脂（丙烯腈·苯乙烯共聚物樹脂）（折射率：丨56〜丨59)、丙烯 酸系紫外線硬化樹脂（折射率：丨46〜丨58)等。就成本方面 及吸濕率較低之方面而言，透明樹脂材料之較佳例為聚苯 乙稀樹脂。 於使用透明樹脂材料作為透明材料之情形時，可於該透 明樹脂材料中添加紫外線吸收劑、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’或可將2種以上加以組合而使用。 紫外線吸收劑之例包含苯并三唑系紫外線吸收劑、二苯 甲鲷系紫外線吸收劑、氰基丙稀酸酉旨系紫外線吸收劑、丙 158564.doc •22- 201219848 二酸醋系紫外線吸收劑、草酸酿替苯胺系紫外線吸收劑、 三呼系紫外線吸收劑等。紫外線吸收劑之較佳例為苯并三 唑系紫外線吸收劑、三畊系紫外線吸收劑。 透明樹脂材料中通常作為添加劑不添加光擴散劑而使 用。然而，只要為不脫離本發明之主旨之範圍，則亦可添 加光擴散劑。 作為光擴散劑，通常使用折射率與主要構成第丨〜第4光 控制板3〇1〜304之如上所述之透明材料不同之粉末。於此情 形時，光擴散劑係分散於透明材料中而使用。上述光擴散 劑之例為含有苯乙烯樹脂粒子、甲基丙稀酸樹脂粒子等有 機粒子，碳酸鉀粒子、矽粒子、聚矽氧樹脂粒子等無機粒 子。光擴散劑之粒徑通常為〇,8 μιη〜5〇 μϊη。 [第1〜第4光控制板之製造方法] 第1〜第4光控制板30广3〇4可藉由例如自透明材料削下之 方法而製造。於使用透明樹脂材料作為透明材料之情形 時’可藉由例如射出成形法、擠壓成形法、感光聚合物 法、壓力成形法等通常之方法而製造第丨〜第4光控制板 3〇ι〜3〇4 0 [第1〜第4光控制板之配置關係] 第1〜第4光控制板3〇1〜3〇4係沿乙方向滿足以下條件而設 置。 ⑴第1〜第4光控制板3〇1〜3〇4中，第j或第2光控制板 3〇丨、3〇2位於最下段，作為稜鏡板之第3或第斗光控制板 3〇3、3〇4位於最上段。所謂上述「最下段」，係指第丨〜第4 158564.doc -23· 201219848 光控制板3〇1〜3〇4中之最下方。所謂上述「最上段」，係指 第1〜第4光控制板30广3〇4中之最上方。 (W第1〜第4光控制板30广3〇4係沿板厚方向（ζ方向）而配 置（或重合而設置），且係以鄰接之2片光控制板中下側之光 控制板之上表面（形成有凸狀部之面）與上側之光控制板之 下表面對向之方式而配置。 (111)第1光控制板30!之凸狀部33〗之延伸方向（γι方向）與 第2光控制板3〇2之凸狀部si之延伸方向（χ2方向）大致正 交。 (iv)第3光控制板3〇3之凸狀部333之延伸方向（γ3方向）與 第4光控制板3〇4之凸狀部η*之延伸方向（χ4方向）大致正 交。 (ν)第1及第2光控制板3(^、302之一者之凸狀部33…332 之延伸方向與第3及第4光控制板3〇3、3〇4之一者之凸狀部 333、334之延伸方向大致平行。 斤明上述正交」，係指2個方向之間之角度為8〇。〜丨〇〇。 之情形。2個方向之間之角度較佳為9〇。^即便關於「平 仃」，雖然較佳為2個方向一致，但亦可為2個方向錯開 ±10°左右。 圖6中所示之光控制板單元21Α中，第1光控制板3〇1位於 最下段，作為稜鏡板之第4光控制板3 ο*位於最上段。第1〜 第4光控制板30〗〜3〇4係沿板厚方向（ζ方向）依序設置且係 以鄰接之2片光控制板3〇丨〜3ο*中下側之光控制板3〇丨〜3〇3之 上表面32丨〜323與上側之光控制板3〇2〜3〇4之下表面”广η* 158564.doc -24 - 201219848 對向之方式而配置。凸狀部33!之延伸方向與凸狀部332之 延伸方向大致正父。凸狀部333之延伸方向與凸狀部334之 延伸方向大致正交。第1光控制板30丨（或第2光控制板3〇2) 之凸狀部33〗（或凸狀部33d之延伸方向與第3光控制板 3〇3(或第4光控制板3〇4)之凸狀部33s(或凸狀部334)之延伸 方向大致平行。由此，第1〜第4光控制板3〇1〜3〇4之配置滿 足上述配置條件（i)〜(v)。 於光控制板單元21A中，第1及第2光控制板3(^, 302之 間之距離七2為凸狀部33丨之頂部33b〗與下表面3l2之間之z 方向上之距離。同樣地，第2及第3光控制板3〇2、303之間 之距離du為凸狀部332之頂部33b2與下表面3丨3之間之2方 向上之距離。第3及第4光控制板3〇3、3〇4之間之距離d34為 凸狀部333之頂部33b»3與下表面3 U之間之Z方向上之距離。 di2、七3及d34為例如5 mm以下。 (光控制板單元21B) 圖13係表示光控制板單元之另一實施形態之概略構成之 立體圖。光控制板單元2ib所包含之第1〜第4光控制板 3〇ι、3〇2、3〇3、3〇4之構成與第1實施形態之第丨〜第4光控 制板3〇1〜3〇4之構成相同。光控制板單元21B於第1~第4光 控制板30^304之配置順序方面，與光控制板單元21八不 同。以該不同方面為中心說明光控制板單元21B。 於光控制板單元21B中，第丨〜第4光控制板3〇1〜3〇4中， 第1光控制板3〇1位於最下段，作為棱鏡板之第4光控制板 3〇4位於最上段。第1〜第4光控制板30^304係以第1光控制 158564.doc -25- 201219848 板30!、第3光控制板3〇3、第2光控制板3〇2及第4光控制板 3〇4之順序沿板厚方向（z方向）設置。於光控制板單元2iB 中，第1光控制板30〗之凸狀部；33!之延伸方向亦與第2光控 制板3〇2之凸狀部332之延伸方向大致正交。第3光控制板 3〇3之凸狀部333之延伸方向與第4光控制板3〇4之凸狀部334 之延伸方向大致正交。第！光控制板3〇ι(或第2光控制板 3〇2)之凸狀部33丨（或凸狀部332)之延伸方向與第3光控制板 3〇3(或第4光控制板3〇4)之凸狀部μ〆或凸狀部^*)之延伸 方向大致平行。由此，光控制板單元21B所包含之第丨〜第4 光控制板30^304之配置滿足配置條件⑴〜(v)。 於光控制板單元21B中，第1及第3光控制板3〇1、3〇3之 間之距離(1丨3為第1光控制板3〇1之凸狀部33ι之頂部Μ、與 第3光控制板3〇3之下表面3丨3之間之z方向上之距離。同樣 地，第3及第2光控制板3〇3、3〇2之間之距離d32為第3光控 制板3〇3之凸狀部333之頂部η、與第2光控制板3〇2之下表 面3U之間之z方向上之距離。第2及第4光控制板3〇2、3〇4 之間之距離d：u為第2光控制板3〇2之凸狀部332之頂部33b2 與第4光控制板3〇4之下表面]“之間之z方向上之距離。 di3、d32及d24為例如5 mm以下。 (光控制板單元21C) 圖14係表示光控制板單元之又一實施形態之概略構成之 立體圖。光控制板單元2ic所包含之第1〜第4光控制板 3〇丨、3〇2、3〇3、3〇4之構成與第1實施形態之第丨〜第*光控 制板3〇1〜3〇4之構成相同。光控制板單元21C於第1〜第4光 158564.doc 26· 201219848 控制板3〇广3〇4之酉己置順序方面，肖光控制板單元2ia不 同以該不同方面為中心，說明光控制板單元21C：。 於光控制板單元21(：中，第丨〜第4光控制板3〇广3〇4中， 第1光控制板30,位於最下段，作為稜鏡板之第3光控制板 3〇3位於最上段。第1〜第4光控制板30,-304係以第1光控制 板3(^、第2光控制板3〇2、第4光控制板3〇4及第3光控制板 3〇3之順序沿板厚方向（z方向）設置。於光控制板單元21C 中，第1光控制板30丨之凸狀部33l之延伸方向亦與第2光控 制板3〇2之凸狀部332之延伸方向大致正交。第3光控制板 3〇3之凸狀部333之延伸方向與第4光控制板3〇4之凸狀部334 之延伸方向大致正交。進而，第1光控制板3〇1(或第2光控 制板3〇2)之凸狀部33!(或凸狀部332)之延伸方向與第3光控 制板3〇3(或第4光控制板3〇4)之凸狀部333(或凸狀部334)之 延伸方向大致平行。由此，光控制板單元21C所包含之第 1〜第4光控制板3〇广3〇4之配置滿足配置條件⑴〜(v)。光控 制板單元21C之配置與在第1實施形態之配置中，將第3及 第4光控制板3〇3、3 〇4於與板厚方向正交之面内旋轉9〇。而 成者相對應。 於光控制板單元21C中’第2及第4光控制板3〇2、304之 間之距離d24為第2光控制板3〇2之凸狀部332之頂部33b2與 第4光控制板3〇2之下表面3I4之間之Z方向上之距離，可例 示5 mm以下。第4及第3光控制板304、303之間之距離d43為 第4光控制板3〇4之凸狀部334之頂部33b4與第3光控制板303 之下表面3h之間之Z方向上之距離，可例示5 mm以下。由 158564.doc •27- 201219848 於第1及第2光控制板30丨、3〇2之間之距離d丨2與第1實施形 態之情形相同’故而省略關於第1及第2光控制板30丨、302 之間之距離d丨2之說明。 作為光控制板單元21之複數個實施形態之例，例示了 3 個光控制板單元21A〜21C ’但就將光控制板單元21製成小 型化者之觀點而言，鄰接之2片光控制板間之距離可為〇 mm。即，亦可以使上側之光控制板之下表面與下側之光 控制板之凸狀部之頂部接觸之方式設置第丨〜第4光控制板 30广3〇4。於此情形時，較佳為較最下段之光控制板，即， 作為最下方之板之光控制板更上側之光控制板之厚度薄於 最下段之光控制板之厚度。例如’較佳為較最下段之光控 制板更上側之光控制板為膜狀。其原因在於，最下段之光 控制板可用作較其更上側之光控制板之支持台。 可使利用圖6中所示之光控制板單元21八對該方面進行具 體說明之圖6中所示之旬2、du及dw可為〇 mm。於此情形 時，將第2〜第4光控制板3 〇2〜3 〇4以使上段之下表面3i2、 313 3丨4與下段之凸狀部33丨、332、333之頂部33b!、In the formula (4), 'wa is the length in the \-axis direction of the convex portion 33丨. In equation (4), C2, C4, C6, C8, q for each of k=b. The combination of Ci2, a* and cm may be any of the charts shown in Figs. 8(a), 8(b) and 8(c), respectively. In Fig. 7, ' represents z(x) corresponding to the combination of C2, C4, & C, ο, c ! 2, C 丨 4, and C -6 shown in Fig. 8(a). The convex portion 33 shown in Fig. 7 is exemplified; the cross-sectional shape is a shape obtained by stretching ζ〇 (χ) in the Ζ direction by a specific magnification (for example, 丨 times) in a range satisfying the formula (3). In this case, the convex portion 33i has a sectional shape that is symmetrical with respect to the axis of the yaw. The cross-sectional shape of the convex portion 33 is not limited to a shape obtained by stretching and contracting only a specific magnification (for example, one magnification) in the direction of ζ〇(χ)κΖ, and the cross-sectional shape of the convex portion 33i is only required to satisfy the formula (3). . In the formula (3), the ζ(χ) system is as shown in Fig. 9. When ζ〇(χ) is determined for a certain width wa, as long as it is passed by 〇95χ~(χ) 158564.doc •18· 201219848 The cross-sectional shape indicated by the contour line of the region between the contour line indicated by the i-center Zq(x) and the contour line indicated by the i-heart Zq(x) may be used. In other words, in the formula (7), the position u z (Xn) with respect to the arbitrary position corresponds to the height of the convex portion % on the value χη. Therefore, the position (6) may be equal to or less than 〇.95z 〇 (xn) and equal to or less than i. 〇 5z 〇 (Xn). As described above, each of the equations (4) ik = 1 to 8 is used. The combination of C4, C6, c8, C丨0, Cl2, 匚^ and 匚丨6 is not limited to the combination of 6 shown in Fig. 8(a), and may be as shown in Fig. 8(b) and Fig. 8(c). The combination shown in ). Fig. H) is a diagram showing an example of z(4) for the combination shown in Fig. 8 (8). In Fig. 10, 'for the condition that ζ(χ) is satisfied, the same as Fig. 9' is indicated by a dot-key line. (4) The indicated corridor line and the contour indicated by 1.05% (8). The cross-sectional shape of the combination of C2 to Cl6 shown in Fig. 亦) is also a cross-sectional shape represented by a contour line passing through a contour line indicated by 〇 and a region between the indicated rim lines. can. Fig. 11 is a view showing an example of z(4) for the combination of C2 to C16 shown in Fig. 8 (4). In the figure ", in order to express the condition of the satisfaction, the disk diagram 9 similarly represents the wheel temple line represented by 〇95χζ〇(χ) with a dotted line, and is represented by 1.05xz〇(x). contour line. The cross-sectional shape based on the combination of C2 to cle shown in Fig. 8A) is also as long as the area between the outline indicated by 〇.95χζ〆^ and the outline indicated by i.OSxzMx) The profile shape represented by the contour line is sufficient. The width wa of the convex portion 33i is usually 40 μm or more, preferably 8 μm or more, in terms of the convex portion 33j, which is caused by the convex portion 158564.doc •19·201219848 33j. The pattern is difficult to be visually recognized by the naked eye, and is usually 8 μm or less, preferably 450 μm or less. Specific examples of the width Wa include 41 〇 μηη, 400 μπι, 325 μηη, 280 μηη, and 100 μηι. However, the value of Wa is not limited to this. In the above description, the cross-sectional shape of the convex portion 33 is represented by ζ (χ) which satisfies the formula (3). However, the cross-sectional shape of the convex portion 33 may be expressed by ζ(χ) satisfying the formula (3) under the condition of _〇 475xWa$x$ 0.475xwa. The reason for this is that the forming error tends to become relatively large near the lower end of the convex portion 33i (near the end portion), and on the other hand, the shape near the lower end has less influence on the diffusibility of light. Although the cross-sectional shape of the convex portion 33 of the convex portion 33 may be the same, the cross-sectional shapes of the convex portion 33 and the convex portion 332 are independently represented by z(x) satisfying the formula (3). The shape is fine. [The convex portions of the third and fourth light control plates] The cross-sectional shapes of the convex portions 333 and 334 included in the third and fourth light control plates 3〇3 and 3〇4 will be described. Here, the convex portions 33] and 334 are referred to as convex portions 33j (j is 3 or 4) unless otherwise specified. Fig. 12 is a view for explaining the shape of the convex portion 33'. Fig. 12 is a view showing a side surface of the case where it is viewed from the extending direction of the convex portion 33'. Since the convex portion 33j has a substantially uniform shape in the extending direction, as shown in Fig. 12, the side surface shape observed from the extending direction corresponds to the cross-sectional shape substantially perpendicular to the extending direction of the convex portion 33. The side shape (or cross-sectional shape) of the convex portion 33 is a substantially right-angled triangle whose apex angle α is substantially a right angle, and preferably the length of the two sides constituting the apex angle is substantially 174564.doc -20·201219848, etc. Right triangle. Although the top ^ is preferably 9 inches. But the corpse must be 8 〇. ~1〇〇. The scope is fine. The distance P between the adjacent two convex portions 33 and 33" can be exemplified by 10 to 1000 μm, preferably 20 μm to 5 μm, and 40 μm to 250 μm. The width of the convex portion 33j can be set such that the distance P between the convex portions 33j is a specific value within the above range. [Layer configuration of the first to fourth light control plates], and the first: fourth light control plates 3〇1 to 3〇4 may be a single layer composed of a single transparent material or may be laminated to be different from each other. A multilayer of a multilayer construction formed by a layer of transparent material. In the case where the i-th to fourth light control boards 3〇 to 304 are multi-layer boards, it is preferable that one or both sides of the jth to fourth light control boards 3〇i to % are formed to be usually 1G μm. The structure of the surface layer of the thickness of (10) μηι 100 μηι. In this case, it is preferred to use a material which is added with an external absorbent as a transparent resin material constituting the surface layer. According to the above configuration D, it is possible to prevent deterioration of the second to fourth light control plates 3〇1 to 3〇4 caused by ultraviolet rays contained in the light from the point light source 22 or the outside. In particular, when the proportion of the ultraviolet light is relatively large as the point light source 22, it is preferable to prevent the deterioration caused by the ultraviolet rays, and it is preferable to form the surface on the lower surfaces 31l to 31. In terms of cost, a, more preferably, does not form a surface layer on the upper surface %~324. When the ultraviolet absorbing agent is used as the transparent resin material constituting the surface layer, the content of the external absorbing agent is usually 0.5% by mass to 5% by mass based on the transparent resin material, preferably ≤ mass% by mass. . An antistatic agent may be applied to one side or both sides of the first to fourth light control plates 3〇1 to 3〇4. By applying an antistatic agent, the dust caused by static electricity can be prevented from being attached, and the light transmittance caused by the adhesion of dust can be prevented from falling. In order to reduce the moiré, the surface on the side of the point light source 22 can be made into a surface having light diffusibility. For example, the surface of the point light source 22 may be formed of a surface layer containing fine particles called a roughening agent as described above, and the surface of the point light source 22 may be embossed and sprayed. A coating liquid containing a roughening agent and a binder may be applied to form a matte layer. [Constituent material] The first to fourth light control plates 3 〇 3 3 〇 4 contain a transparent material. The refractive index of transparent materials is usually! .46~1.62. Examples of the transparent material include a transparent resin material and a transparent glass material. Examples of the transparent resin material include polycarbonate resin (refractive index 1.59), MS (Methylmethacrylate Styrene) resin (methyl methacrylate styrene copolymer resin) (refractive index: 156 to 159), and polystyrene resin ( Refractive index: 1.59), AS (ACryl〇nitrile Styrene) resin (acrylonitrile-styrene copolymer resin) (refractive index: 丨56~丨59), acrylic ultraviolet curable resin (refractive index: 丨46~丨58) Wait. A preferred example of the transparent resin material is a polystyrene resin in terms of cost and a low moisture absorption rate. When a transparent resin material is used as the transparent material, an additive such as an ultraviolet absorber, an antistatic agent, an antioxidant, a processing stabilizer, a flame retardant, or a lubricant may be added to the transparent resin material. These additives may be used singly or in combination of two or more. Examples of the ultraviolet absorber include a benzotriazole-based ultraviolet absorber, a benzotrifluoride-based ultraviolet absorber, and a cyanoacrylate-based ultraviolet absorber, C 158564.doc • 22-201219848 Diacetate-based ultraviolet absorption Agent, oxalic acid anilide-based ultraviolet absorber, three-line ultraviolet absorber, and the like. Preferred examples of the ultraviolet absorber are a benzotriazole-based ultraviolet absorber and a three-pill ultraviolet absorber. The transparent resin material is usually used as an additive without adding a light diffusing agent. However, a light diffusing agent may be added as long as it does not deviate from the gist of the present invention. As the light diffusing agent, a powder having a refractive index different from that of the above-described transparent materials mainly constituting the second to fourth light control plates 3〇1 to 304 is generally used. In this case, the light diffusing agent is used by being dispersed in a transparent material. Examples of the light diffusing agent include organic particles such as styrene resin particles and methyl acrylate resin particles, and inorganic particles such as potassium carbonate particles, cerium particles, and polyoxyn resin particles. The particle size of the light diffusing agent is usually 〇, 8 μm to 5 μ μηη. [Manufacturing Method of First to Fourth Light Control Panels] The first to fourth light control panels 30 can be manufactured by, for example, a method of cutting from a transparent material. When a transparent resin material is used as the transparent material, the second to fourth light control plates 3 can be manufactured by a usual method such as injection molding, extrusion molding, photopolymerization, or pressure molding. 〜3〇4 0 [Arrangement relationship of the first to fourth light control boards] The first to fourth light control boards 3〇1 to 3〇4 are provided in the B direction and satisfy the following conditions. (1) Among the first to fourth light control boards 3〇1 to 3〇4, the jth or second light control boards 3〇丨, 3〇2 are located at the lowermost stage, and the third or third light control panel 3 as a seesaw 〇3, 3〇4 are located at the top. The above-mentioned "lowest paragraph" refers to the lowest of the third to fourth 158564.doc -23·201219848 light control boards 3〇1~3〇4. The above-mentioned "topmost" refers to the uppermost of the first to fourth light control panels 30. (W the first to fourth light control plates 30 are arranged in the thickness direction (the direction of the ζ), or are arranged in the same direction, and are connected to the lower side of the two light control boards. The upper surface (the surface on which the convex portion is formed) is disposed opposite to the lower surface of the upper light control plate. (111) The extending direction of the convex portion 33 of the first light control plate 30! (γι direction) It is substantially orthogonal to the extending direction (χ2 direction) of the convex portion si of the second light control plate 3〇2. (iv) The extending direction (γ3 direction) of the convex portion 333 of the third light control plate 3〇3 and The extending direction (χ4 direction) of the convex portion η* of the fourth light control plate 3〇4 is substantially orthogonal. (ν) The first and second light control plates 3 (the convex portions 33 of one of the ^2, 302... The extending direction of 332 is substantially parallel to the extending direction of the convex portions 333 and 334 of one of the third and fourth light control plates 3〇3 and 3〇4. The above-mentioned orthogonality refers to the two directions. The angle is 8 〇. 丨〇〇. In the case of the two directions, the angle between the two directions is preferably 9 〇. ^ Even though the "flat" is preferably two directions, it can be two. The direction is staggered by ±10° In the light control panel unit 21 shown in Fig. 6, the first light control panel 3〇1 is located at the lowermost stage, and the fourth light control panel 3** as the seesaw is located at the uppermost stage. The first to fourth light controls The plates 30 〗 3 〇 4 are sequentially arranged along the plate thickness direction (ζ direction) and are adjacent to the two light control plates 3 〇丨 3 3 * the middle and lower side light control plates 3 〇丨 3 3 〇 3 The upper surface 32丨~323 and the lower surface of the light control board 3〇2~3〇4 are wide η* 158564.doc -24 - 201219848. The direction of the convex portion 33! The extending direction of the portion 332 is substantially a parent. The extending direction of the convex portion 333 is substantially orthogonal to the extending direction of the convex portion 334. The convex shape of the first light control plate 30 (or the second light control plate 3 2) The portion 33 is extended (the direction in which the convex portion 33d extends is substantially parallel to the extending direction of the convex portion 33s (or the convex portion 334) of the third light control plate 3〇3 (or the fourth light control plate 3〇4). Thereby, the arrangement of the first to fourth light control boards 3〇1 to 3〇4 satisfies the above-described arrangement conditions (i) to (v). In the light control panel unit 21A, the first and second light control boards 3 ( ^, the distance between 302 and 7 is convex The distance between the top 33b of the portion 33b and the lower surface 3112 is the distance in the z direction. Similarly, the distance du between the second and third light control plates 3〇2, 303 is the top 33b2 of the convex portion 332 and The distance between the lower surfaces 3丨3 in the two directions. The distance d34 between the third and fourth light control plates 3〇3, 3〇4 is the top 33b»3 of the convex portion 333 and the lower surface 3 U The distance in the Z direction is di2, VII, and d34, for example, 5 mm or less. (Light control panel unit 21B) Fig. 13 is a perspective view showing a schematic configuration of another embodiment of the light control panel unit. The first to fourth light control boards 3〇, 3〇2, 3〇3, and 3〇4 included in the light control panel unit 2ib and the first to fourth light control boards 3〇1 of the first embodiment. The composition of ~3〇4 is the same. The light control panel unit 21B is different from the light control panel unit 21 in the arrangement order of the first to fourth light control panels 30^304. The light control panel unit 21B will be described centering on this different aspect. In the light control panel unit 21B, among the second to fourth light control panels 3〇1 to 3〇4, the first light control panel 3〇1 is located at the lowermost stage, and the fourth light control panel 3〇4 as the prism sheet is located. The top paragraph. The first to fourth light control boards 30^304 are controlled by the first light 158564.doc -25 - 201219848 board 30!, the third light control board 3〇3, the second light control board 3〇2, and the fourth light control. The order of the plates 3〇4 is set in the plate thickness direction (z direction). In the light control panel unit 2iB, the extending direction of the convex portion of the first light control plate 30; 33! is also substantially orthogonal to the extending direction of the convex portion 332 of the second light control plate 3A2. The extending direction of the convex portion 333 of the third light control plate 3〇3 is substantially orthogonal to the extending direction of the convex portion 334 of the fourth light control plate 3〇4. The first! The extending direction of the convex portion 33 (or the convex portion 332) of the light control plate 3 (or the second light control plate 3 〇 2) and the third light control plate 3 〇 3 (or the fourth light control plate 3) The extending direction of the convex portion μ〆 or the convex portion ^*) of 〇4) is substantially parallel. Thereby, the arrangement of the third to fourth light control boards 30^304 included in the light control panel unit 21B satisfies the arrangement conditions (1) to (v). In the light control panel unit 21B, the distance between the first and third light control plates 3〇1 and 3〇3 (1丨3 is the top of the convex portion 331 of the first light control plate 3〇1, and The distance in the z direction between the lower surfaces 3丨3 of the third light control plate 3〇3. Similarly, the distance d32 between the third and second light control plates 3〇3 and 3〇2 is the third light. The distance between the top η of the convex portion 333 of the control panel 3〇3 and the lower surface 3U of the second light control panel 3〇2. The second and fourth light control panels 3〇2, 3〇 The distance d between 4: u is the distance in the z direction between the top portion 33b2 of the convex portion 332 of the second light control plate 3〇2 and the lower surface of the fourth light control plate 3〇4. D32 and d24 are, for example, 5 mm or less. (Light control panel unit 21C) Fig. 14 is a perspective view showing a schematic configuration of still another embodiment of the light control panel unit. The first to fourth light controls included in the light control panel unit 2ic The configurations of the plates 3〇丨, 3〇2, 3〇3, 3〇4 are the same as those of the first to third light control plates 3〇1 to 3〇4 of the first embodiment. The light control panel unit 21C is 1~4th light 158564.doc 26· 201219848 Control panel 3〇广3〇4 In terms of the order, the Xiaoguang control panel unit 2ia is different from the different aspects, and the light control panel unit 21C is described. In the light control panel unit 21 (:, the third to fourth light control panel 3 is wide and 3) In the fourth stage, the first light control panel 30 is located at the lowermost stage, and the third light control board 3〇3 as the seesaw is located at the uppermost stage. The first to fourth light control boards 30 and -304 are the first light control board 3 (^, the order of the second light control panel 3〇2, the fourth light control panel 3〇4, and the third light control panel 3〇3 is set in the thickness direction (z direction). In the light control panel unit 21C, The extending direction of the convex portion 33l of the light control plate 30 is also substantially perpendicular to the extending direction of the convex portion 332 of the second light control plate 3〇2. The convex portion 333 of the third light control plate 3〇3 The extending direction is substantially perpendicular to the extending direction of the convex portion 334 of the fourth light control plate 3〇4. Further, the convex portion 33 of the first light control plate 3〇1 (or the second light control plate 3〇2)! The extending direction of (or the convex portion 332) is substantially parallel to the extending direction of the convex portion 333 (or the convex portion 334) of the third light control plate 3〇3 (or the fourth light control plate 3〇4). , the light control board unit 21C is included The arrangement of the first to fourth light control boards 3 〇 〇 〇 4 satisfies the arrangement conditions (1) to (v). The arrangement of the light control board unit 21C and the arrangement of the first embodiment, the third and fourth light control The plates 3〇3, 3〇4 are rotated by 9 turns in a plane orthogonal to the thickness direction. The corresponding ones are corresponding. In the light control panel unit 21C, the 'second and fourth light control boards 3〇2, 304 are The distance d24 is the distance in the Z direction between the top portion 33b2 of the convex portion 332 of the second light control plate 3〇2 and the lower surface 3I4 of the fourth light control plate 3〇2, and can be exemplified by 5 mm or less. The distance d43 between the fourth and third light control plates 304 and 303 is in the Z direction between the top portion 33b4 of the convex portion 334 of the fourth light control plate 3〇4 and the lower surface 3h of the third light control plate 303. The distance can be exemplified by 5 mm or less. 158564.doc •27-201219848 The distance d丨2 between the first and second light control boards 30丨 and 3〇2 is the same as that of the first embodiment. Therefore, the first and second light control boards are omitted. The description of the distance d丨2 between 30丨 and 302. As an example of a plurality of embodiments of the light control panel unit 21, three light control panel units 21A to 21C' are illustrated. However, in terms of miniaturizing the light control panel unit 21, two adjacent light control units are provided. The distance between the plates can be 〇mm. In other words, the second to fourth light control plates 30 may be provided in such a manner that the lower surface of the upper light control plate is in contact with the top of the convex portion of the lower light control plate. In this case, it is preferable that the light control panel of the lowermost stage, that is, the thickness of the light control panel which is the upper side of the light control panel which is the lowermost panel, is thinner than the thickness of the lowermost light control panel. For example, it is preferable that the light control panel on the upper side of the lowermost light control panel has a film shape. The reason for this is that the lowermost light control panel can be used as a support for the light control panel above its upper side. The second, du, and dw shown in Fig. 6 which is specifically illustrated by the light control panel unit 21 shown in Fig. 6 can be 〇 mm. In this case, the second to fourth light control plates 3 〇 2 to 3 〇 4 are used to make the upper surface 3i2, 313 3丨4 of the upper stage and the top 33b of the convex portions 33 丨, 332, 333 of the lower stage,
Db2、33b3接觸之方式配置於第1光控制板3〇ι之凸狀部33丨 上。如此，於在光控制板單元21A中位於最靠近點狀光源 22側之位置之第上光控制板3〇1上，將第2〜第4光控制板 3〇2〜3〇4以使鄰接之2片光控制板3〇丨〜3〇4中上側及下側之板 互相接觸之方式而設置之情形時，較佳為第2〜4光控制板 3〇2〜3〇4之厚度心〜心薄於第1光控制板3〇ι之厚度巾。其原因 在於，例如，於第2〜4光控制板3〇2〜3〇4為較膜狀等更薄者 158564.doc -28 * 201219848 之匱形時，第1光控制板3〇1可用作第2〜4光控制板3〇2〜3〇4 之支持台。 [光控制板單元之配置] 光控制板單元21可為光控制板單元21A〜21 C之任一者。 於此處所例示之各實施形態中，第1光控制板％!位於最下 段。於此情形時，光控制板單元21係以自點狀光源22至最 下段之光控制板即第i光控制板3 〇〗之下表面3丨丨為止之距離 D通常為3 mm〜50 mm之方式而配置於點狀光源22上。於透 過型圖像顯示裝置1或面光源裝置20中，就可使面光源裝 置20變薄之方面而言，Lx、L>^D較佳為^①及^①分別 為2以上’更佳為2.5以上之值。 於透過型圖像顯示裝置丨中，光控制板單元21既可以第1 光控制板30〗所具有之凸狀部33ι之延伸方向成為畫面之縱 向之方式進行配置，亦可以凸狀部33ι之延伸方向成為畫 面之橫向之方式進行配置。 其次，關於光控制板單元21之作用效果，如圖丨所示， 以將包含光控制板單元21之面光源裝置2〇應用於透過型圖 像顯示裝置1之情形為例進行說明。於作用效果之說明 中，XI方向、X2方向、X3方向及X4方向與χ方向平行， Y1方向、Y2方向、Y3方向及Y4方向與γ方向平行。 第1光控制板30〗之凸狀部33l具有由滿足式（3)之2(4所表 示之剖面形狀。第3光控制板3〇3之凸狀部Μ;係剖面形狀為 大致直角三角形之稜鏡部。該構成中，於將第丨及第3光控 制板30丨、3〇3以使凸狀部33l、33s之延伸方向大致平行之 158564.doc -29· 201219848 方式配置於滿足使用圖4及圖5所說明之第1及第2配光特性 之任一者的點狀光源22上之情形時，第丄及第3光控制板 3〇〗、3〇3可將自點狀光源22輸出之光轉換為亮度均勻之線 狀之光而出射。同樣地，第3光控制板3〇3之凸狀部333具有 由滿足式（3)之ζ(χ)所表示之剖面形狀。第4光控制板3〇4之 凸狀部334係剖面形狀為大致直角三角形之稜鏡部。因 此，與第1及第3光控制板3〇丨、3〇3之情形同樣地，第2及第 4光控制板3〇2、3〇4可將來自點狀光源22之光轉換為亮度均 勻之線狀之光而出射。 於光控制板單元2 1中，如上所述，可將來自點狀光源22 之光轉換為亮度大致均勻之線狀之光的第丨及第3光控制板 3〇ι 3〇3之組與第2及第4光控制板3〇2、304之組係以在z方 向上，凸狀部331(或凸狀部33J之延伸方向與凸狀部332(或 凸狀部334)之延伸方向大致正交之方式而配置。因此，來 自點狀光源22之光藉由第！及第3光控制板3〇ι、3〇3之組以 及第2及第4光控制板3〇2、3〇4之組，而轉換為亮度均勻且 於大致正交之方向上分別為線狀之光。其結果，光控制板 單元21可使來自複數個點狀光源22之光均勻地分散，並可 使其作為面狀之光且於與2方向正交之面内亮度均勻度更 高之面狀之光而出射。 由於面光源裝置20包含上述光控制板單元21，故而可使 來自複數個點狀光源22之光均勻地分散，且可出射與2方 向正交之面上之亮度均勻度更高之面狀之光。於透過型圖 像顯示裝置1中，由於包含上述光控制板單元21，故而藉 158564.doc -30- 201219848 由使來自複數個點狀光源22之光均勻地分散而與z方向正 父之面上之亮度均勻度更高之面狀之光，可照射透過型圖 像顯不部10。其結果’透過型圖像顯示裝置1可顯示更高 品質之圖像。 於採用光控制板單元21A作為光控制板單元21之情形 時’第1〜第4光控制板30丨〜3〇4係以於z方向上凸狀部33丨、 332、333、3 34之延伸方向交替地大致正交之方式而配置。 因此’自第4光控制板3 ο*出射之面狀之光中難以產生疊紋 條紋。由此’包含光控制板單元21A與複數個點狀光源22 之面光源裝置10可出射抑制了疊紋條紋之面狀之光。進 而，包含光控制板單元21A與複數個點狀光源22之透過型 圖像顯示裝置1可顯示更高品質之圖像。 以上，對本發明之實施形態進行了說明，但本發明並不 限定於上述實施形態。例如，光控制板單元2丨包含第丨〜第 4光控制板30广3〇4 ’但如圖16所示’亦可包含第}及第2光 控制板30丨、3〇2之2片光控制板。第i及第2光控制板3〇丨、 3 〇2分別包含具有式（3)所表示之輪廓形狀之凸狀部33ι、 33广因此，於具有使用圖4及圖5所說明之第1及第2配光 特性之一者的點狀光源22上配置有第1及第2光控制板 3(h、3〇2時，包含第i及第2光控制板％、％之光控制板 單元21可將來自點狀光源22之光轉換為線狀之光且於延伸 方向上7C度大致均勻之線狀之光。而且，第丨及第2光控制 板3(h、3〇2係以凸狀部33l、332各自之延伸方向大致正交 之方式而配置。其結果，包含第i及第2光控制板3〇1、3〇2 I58564.doc •31· 201219848 之光控制板單元21可生成亮度均勻度更高之面狀之光。換 言之’包含第1及第2光控制板30丨、302之光控制板單元21 可使來自點狀光源2 2之光以面狀均勻地分散。 於圖2及圖3中表示了複數個點狀光源22之配置例，例 如’正方格子，即如上所述般於X方向及γ方向上鄰接之 點狀光源22間之間隔亦可相同。對鄰接之凸狀部331之剖 面形狀中之端部33a!係於凸狀部33 i之排列方向上重疊之情 況進行了說明，但亦可於鄰接之凸狀部33丨之端部33心間產 生稍微之平坦部（例如由製造誤差所產生之程度者）等。該 情況對於凸狀部3 32〜3 34之各者之配置亦同樣。 光控制板單元21亦可於透過型液晶顯示部〗〇側（例如， 液晶面板側）更包含擴散膜、微透鏡膜或反射型偏光膜等 光學膜。透過型圖像顯示裝置丨可為如下構成：在光控制 板單元21與透過型液晶顯示部1〇之間更包含上述擴散膜、 微透鏡膜或反射型偏光膜等光學膜。 進而，面光源裝置20或透過型圖像顯示裝置卜亦可包含 將自點狀光源22輸出之光反射至光控制板單元21側之反射 板等反射機構。反射機構係於圖丨所示之模式圖中只要 設置於對點狀光源22而言為光控制板單元21之相反側即 可，例如，亦可以使用以保持點狀光源22之保持構件之光 源載置面發揮反射面之功能之方式而構成。 對第i及第2光控制板3〇1、3〇2作為光擴散板之情況進行 了說明’但第i及第2光控制板3〇1、3〇2只要為分別賦形有 凸狀部33丨及凸狀部332之板狀之光學零件即可。 158564.doc -32- 201219848 圖6、圖13〜圖15中所例示之光控制板單元21所包含之複 數個光控制板中，位於最靠近點狀光源22側之光控制板可 為厚度為1 · 0 mm以上之片狀者。於此情形時，在光控制板 之製造中可使用擠壓成形法。作為該光控制板之材料，可 使用折射率為1.56〜1.62左右之聚苯乙烯、聚碳酸醋。位於 最靠近點狀光源22側之位置之光控制板以外之光控制板可 為厚度未達1.0 mm之膜狀者。於此情形時，作為可於凸狀 部之賦形中使用感光聚合物法之該光控制板之材料，可使 用折射率為1.46〜1.58之丙烯酸系紫外線硬化樹脂，就成本 方面或防止膜之黃變劣化之觀點而言，較佳為使用折射率 為1.5 1左右之低折射率樹脂。 位於最靠近點狀光源22侧之位置之光控制板較佳為厚度 為1 mm以上且5 mm以下之片狀者，位於最靠近點狀光源 側之位置之光控制板以外之光控制板較理想的是厚度未達 1 mm之膜狀者。 【圖式簡單說明】 圖1係模式性地表示本發明之透過型圖像顯示裝置之一 實施形態之構成的剖面圖。 圖2係表示點狀光源之配置之一例之圖式。 圖3係表示點狀光源之配置之另一例之圖式。 圖4係表示圖1中所示之透過型圖像顯示裝置中所使用之 點狀光源之配光分佈之一例的圖式。 圖5係表示圖1申所示之透過型圖像顯示裝置中所使用之 點狀光源之配光分佈之另一例的圖式。 158564.doc •33- 201219848 圖ό係表示圖1中所示之光控制板單元之一實施形態之立 體圖。 圖7係表示圖6中所示之光控制板單元之第1及第2光控制 板所具有之凸狀部之剖面形狀之例的圖式。 圖8之圖8(a)係表示規定表示圖6中所示之第1及第2光控 制板之凸狀部之剖面形狀的ζ(χ)之係數之一例的圖表。圖 8(b)係表示規定表示圖6中所示之第1及第2光控制板之凸狀 部之剖面形狀的ζ(χ)之係數之另一例的圖表。圖8(c)係表 不規定表示圖6中所示之第i及第2光控制板之凸狀部之剖 面形狀的z(x)之係數之又一例的圖表。 圖9係表示第1及第2光控制板所具有之凸狀部之剖面形 狀所滿足之條件之圖式。 圖10係表示圖6中所示之光控制板單元之第1及第2光控 制板所具有之凸狀部之剖面形狀之另一例的圖式。 圖11係表不圖ό中所示之光控制板單元之第1及第2光控 制板所具有之凸狀部之剖面形狀之又一例的圖式。 圖12係用以說明圖6中所示之光控制板單元之第3及第4 光控制板所具有之凸狀部之剖面形狀的圖式。 圖13係表示光控制板單元之另一實施形態之立體圖。 圖14係表示光控制板單元之又一實施形態之立體圖。 圖15係表示光控制板單元之又一實施形態之立體圖。 圖16係模式性地表示先前之透過型圖像顯示裝置之構成 的剖面圖。 【主要元件符號說明】 158564.doc -34- 201219848 1 透過型圖像顯示裝置 10 透過型圖像顯示部 20 面光源裝置 21 光控制板單元 21A 光控制板單元 21B 光控制板單元 21C 光控制板單元 22 點狀光源 3〇! 第1光控制板 3〇2 第2光控制板 3〇3 第3光控制板（第1稜鏡板） 3〇4 第4光控制板（第2稜鏡板） 31i 第1光控制板之下表面 312 第2光控制板之下表面 313 第3光控制板之下表面 314 第4光控制板之下表面 32! 第1光控制板之上表面（第1光控制板之單面） 322 第2光控制板之上表面（第2光控制板之單面） 323 第3光控制板之上表面（第1棱鏡板之單面） 324 第4光控制板之上奉面（第2棱鏡板之單面） 33i 第1光控制板之凸狀部 332 第2光控制板之凸狀部 333 第3光控制板之凸狀部（第1稜鏡板之稜鏡部） 334 第4光控制板之凸狀部（第2稜鏡板之稜鏡部） 158564.doc -35- 201219848 33a! 凸狀部之端部（第丨光控制板之凸狀部之端部） 33a2 凸狀部之端部（第2光控制板之凸狀部之端部） XI 與Y1方向大致正交之方向 X2 第2光控制板之凸狀部之延伸方向 X3 與Y3方向大致正交之方向 X4 第4光控制板（第2稜鏡板）之凸狀部（稜鏡部）之 延伸方向 Y1 第1光控制板之凸狀部之延伸方向 Y2 與X2方向大致正交之方向 Y3 第3光控制板（第1稜鏡板）之凸狀部（稜鏡部）之 延伸方向 Y4 與X4方向大致正交之方向 158564.docThe Db2 and 33b3 are placed in contact with each other on the convex portion 33A of the first light control plate 3〇. In this way, the second to fourth light control plates 3〇2 to 3〇4 are adjacent to each other on the upper light control plate 3〇1 located at the position closest to the point light source 22 side of the light control panel unit 21A. In the case where the upper and lower plates of the two light control plates 3 to 3 are disposed in contact with each other, the thickness of the second to fourth light control plates 3〇2 to 3〇4 is preferably preferable. ~ The heart is thinner than the thickness of the first light control board 3〇ι. The reason for this is that, for example, when the second to fourth light control panels 3〇2 to 3〇4 are thinner than the film shape, such as 158564.doc -28 * 201219848, the first light control panel 3〇1 can be used. It is used as a support for the 2nd to 4th light control boards 3〇2 to 3〇4. [Configuration of Light Control Board Unit] The light control board unit 21 may be any of the light control board units 21A to 21 C. In each of the embodiments exemplified herein, the first light control panel %! is located at the lowermost stage. In this case, the light control panel unit 21 has a distance D from the point light source 22 to the lowermost section of the light control panel, that is, the lower surface of the ith light control panel 3, which is usually 3 mm to 50 mm. In this manner, it is disposed on the point light source 22. In the transmissive image display device 1 or the surface light source device 20, Lx, L > ^D is preferably 2 or more and 2 or more in terms of thinning the surface light source device 20, respectively. It is a value of 2.5 or more. In the transmissive image display device, the light control panel unit 21 may be arranged such that the extending direction of the convex portion 33ι of the first light control panel 30 is the vertical direction of the screen, or the convex portion 33 The extension direction is configured so as to be horizontal to the screen. Next, the operation and effect of the light control panel unit 21 will be described as an example in which the surface light source device 2 including the light control panel unit 21 is applied to the transmissive image display device 1. In the description of the effect, the XI direction, the X2 direction, the X3 direction, and the X4 direction are parallel to the χ direction, and the Y1 direction, the Y2 direction, the Y3 direction, and the Y4 direction are parallel to the γ direction. The convex portion 33l of the first light control plate 30 has a cross-sectional shape satisfying the formula (3) 2 (4). The convex portion of the third light control plate 3〇3; the cross-sectional shape is a substantially right triangle In this configuration, the third and third light control plates 30A and 3B are arranged such that the extending directions of the convex portions 33l and 33s are substantially parallel, and are arranged in a manner of 158564.doc -29·201219848. When the point light source 22 of any of the first and second light distribution characteristics described with reference to FIGS. 4 and 5 is used, the third and third light control plates 3, 3, and 3 can be self-pointed. The light outputted from the light source 22 is converted into linear light of uniform brightness and emitted. Similarly, the convex portion 333 of the third light control plate 3〇3 has a profile represented by ζ(χ) satisfying the formula (3). The convex portion 334 of the fourth light control plate 3〇4 has a cross-sectional shape of a substantially right-angled triangle. Therefore, similarly to the case of the first and third light control plates 3〇丨 and 3〇3, The second and fourth light control plates 3〇2 and 3〇4 can convert light from the point light source 22 into linear light having uniform brightness and emit it. In the light control panel unit 21, as above The group of the third and third light control plates 3〇ι 3〇3 and the second and fourth light control plates 3〇2 which convert light from the point light source 22 into linear light having substantially uniform brightness. The group of 304 is arranged such that the convex portion 331 (or the extending direction of the convex portion 33J is substantially orthogonal to the extending direction of the convex portion 332 (or the convex portion 334) in the z direction. The light of the point light source 22 is converted into a uniform brightness by the group of the third and third light control plates 3〇, 3〇3 and the second and fourth light control plates 3〇2, 3〇4. The light in the substantially orthogonal direction is linear light. As a result, the light control panel unit 21 can uniformly distribute the light from the plurality of point light sources 22, and can make it as a planar light and The planar light source device 20 includes the above-described light control panel unit 21 so that the light from the plurality of point light sources 22 can be uniformly dispersed, and the light can be uniformly dispersed. A planar light having a higher brightness uniformity on a plane orthogonal to the two directions is emitted. In the transmissive image display device 1, since The light control panel unit 21, by 158564.doc -30-201219848, is a planar light having a uniform brightness uniformity with respect to the positive direction of the z-direction from the light of the plurality of point light sources 22, The transmissive image display portion 10 can be irradiated. As a result, the transmissive image display device 1 can display a higher quality image. When the light control panel unit 21A is used as the light control panel unit 21, the first 1~ The fourth light control plates 30A to 3B are arranged such that the extending directions of the convex portions 33A, 332, 333, and 34 in the z direction are alternately substantially orthogonal to each other. Therefore, it is difficult to generate a streak stripe in the surface light emitted from the fourth light control panel 3 ο*. Thus, the surface light source device 10 including the light control panel unit 21A and the plurality of point light sources 22 can emit light having a planar shape in which the streaks are suppressed. Further, the transmissive image display device 1 including the light control panel unit 21A and the plurality of point light sources 22 can display a higher quality image. Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, the light control panel unit 2 includes the third to fourth light control panels 30, which are 3〇4', but as shown in FIG. 16, 'may also include the second and second light control panels 30丨, 3〇2 Light control board. Each of the i-th and second light-control panels 3A and 3B includes a convex portion 33i and 33 having a contour shape represented by the formula (3), and thus has the first one described with reference to FIGS. 4 and 5. When the first and second light control plates 3 are disposed on the point light source 22 of one of the second light distribution characteristics (h, 3, 2, the light control board including the i and second light control boards % and %) The unit 21 can convert the light from the point light source 22 into linear light and linearly light having a substantially uniform 7C degree in the extending direction. Further, the second and second light control plates 3 (h, 3〇2) The convex portions 33l and 332 are arranged so as to be substantially orthogonal to each other. As a result, the light control panel unit including the i-th and second light control plates 3〇1, 3〇2, I58564.doc • 31·201219848 21 can generate a planar light having a higher brightness uniformity. In other words, the light control panel unit 21 including the first and second light control plates 30A and 302 can make the light from the point light source 22 uniform in a planar manner. 2 and 3 show an arrangement example of a plurality of point light sources 22, for example, a 'square lattice, which is a point adjacent in the X direction and the γ direction as described above. The interval between the light sources 22 may be the same. The end portions 33a of the cross-sectional shapes of the adjacent convex portions 331 are overlapped in the arrangement direction of the convex portions 33 i, but may be adjacent to the convex portions. The end portion 33 of the portion 33 has a slightly flat portion (for example, a degree due to a manufacturing error), etc. In this case, the arrangement of each of the convex portions 3 32 to 34 is also the same. The unit 21 may further include an optical film such as a diffusion film, a microlens film, or a reflective polarizing film on the side of the transmissive liquid crystal display unit (for example, the liquid crystal panel side). The transmissive image display device may be configured as follows: The optical control panel unit 21 and the transmissive liquid crystal display unit 1 further include an optical film such as the diffusion film, the microlens film, or the reflective polarizing film. Further, the surface light source device 20 or the transmissive image display device may include The light output from the point light source 22 is reflected to a reflection mechanism such as a reflection plate on the side of the light control panel unit 21. The reflection mechanism is provided in the pattern diagram shown in FIG. Opposite side of unit 21 For example, the light source mounting surface of the holding member of the point light source 22 may be configured to function as a reflecting surface. The i-th and second light control plates 3〇1 and 3〇2 may be used as light. In the case of the diffusion plate, the first and second light control plates 3〇1 and 3〇2 may be plate-shaped optical components each having a convex portion 33丨 and a convex portion 332. .doc -32- 201219848 Among the plurality of light control boards included in the light control panel unit 21 illustrated in FIG. 6 and FIG. 13 to FIG. 15, the light control panel located closest to the point light source 22 side may have a thickness of 1 · Those who are more than 0 mm. In this case, an extrusion method can be used in the manufacture of the light control panel. As the material of the light control plate, polystyrene or polycarbonate having a refractive index of about 1.56 to 1.62 can be used. The light control panel other than the light control panel located closest to the point of the point light source 22 may be a film having a thickness of less than 1.0 mm. In this case, as the material of the light control plate which can use the photopolymer method in the shaping of the convex portion, an acrylic ultraviolet curable resin having a refractive index of 1.46 to 1.58 can be used, in terms of cost or film prevention. From the viewpoint of deterioration of yellowing, a low refractive index resin having a refractive index of about 1.5 1 is preferably used. The light control panel located at the position closest to the point light source 22 side is preferably a sheet having a thickness of 1 mm or more and 5 mm or less, and the light control panel other than the light control panel located closest to the point light source side is Ideally, the film is less than 1 mm thick. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view schematically showing a configuration of an embodiment of a transmissive image display device of the present invention. Fig. 2 is a view showing an example of the arrangement of a point light source. Fig. 3 is a view showing another example of the arrangement of the point light sources. Fig. 4 is a view showing an example of a light distribution of a point light source used in the transmissive image display device shown in Fig. 1. Fig. 5 is a view showing another example of the light distribution of the point light source used in the transmissive image display device shown in Fig. 1. 158564.doc •33-201219848 The diagram shows a perspective view of one embodiment of the light control panel unit shown in Fig. 1. Fig. 7 is a view showing an example of a cross-sectional shape of a convex portion of the first and second light control plates of the light control panel unit shown in Fig. 6. Fig. 8 (a) is a graph showing an example of a coefficient defining a cross-sectional shape of a convex portion of the first and second optical control plates shown in Fig. 6. Fig. 8(b) is a graph showing another example of the coefficient of ζ(χ) indicating the cross-sectional shape of the convex portions of the first and second light control plates shown in Fig. 6. Fig. 8(c) is a graph showing still another example of the coefficient of z(x) indicating the sectional shape of the convex portions of the i-th and second light control plates shown in Fig. 6. Fig. 9 is a view showing conditions satisfying the cross-sectional shape of the convex portion of the first and second light control plates. Fig. 10 is a view showing another example of the cross-sectional shape of the convex portion of the first and second optical control plates of the light control panel unit shown in Fig. 6. Fig. 11 is a view showing still another example of the cross-sectional shape of the convex portion of the first and second light control plates of the light control panel unit shown in Fig. Fig. 12 is a view for explaining a cross-sectional shape of a convex portion of the third and fourth light control plates of the light control panel unit shown in Fig. 6. Fig. 13 is a perspective view showing another embodiment of the light control panel unit. Fig. 14 is a perspective view showing still another embodiment of the light control panel unit. Fig. 15 is a perspective view showing still another embodiment of the light control panel unit. Fig. 16 is a cross-sectional view schematically showing the configuration of a conventional transmissive image display device. [Description of main component symbols] 158564.doc -34- 201219848 1 Transmissive image display device 10 Transmissive image display unit 20 Surface light source device 21 Light control panel unit 21A Light control panel unit 21B Light control panel unit 21C Light control panel Unit 22 Point light source 3〇! 1st light control board 3〇2 2nd light control board 3〇3 3rd light control board (1st board) 3〇4 4th light control board (2nd board) 31i The first light control board lower surface 312 the second light control board lower surface 313 the third light control board lower surface 314 the fourth light control board lower surface 32! The first light control board upper surface (the first light control One side of the board) 322 The upper surface of the second light control board (single side of the second light control board) 323 The upper surface of the third light control board (one side of the first prism sheet) 324 Above the fourth light control board The facing surface (single side of the second prism sheet) 33i The convex portion 332 of the first light control board 333 The convex portion 333 of the second light control board The convex portion of the third light control plate (the top of the first slab) ) 334 The convex part of the 4th light control board (the top part of the 2nd board) 158564.doc -35- 201219848 33a The end of the convex portion (the end of the convex portion of the second light control panel) 33a2 The end portion of the convex portion (the end portion of the convex portion of the second light control plate) XI is substantially orthogonal to the Y1 direction Direction X2 The direction in which the convex portion of the second light control plate extends X3 is substantially perpendicular to the direction of the Y3 direction X4 The direction in which the convex portion (the second portion) of the fourth light control plate (the second jaw) extends is the first direction Y1 The direction Y2 in which the convex portion of the light control plate extends in a direction substantially perpendicular to the X2 direction Y3 is substantially orthogonal to the direction of extension X4 of the convex portion (the crotch portion) of the third light control plate (first plate) Direction 158564.doc