201137406 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種樹脂片，具體而言，係關於一種使用 於液晶顯示裝置中設置之各種光學板用途中的樹脂片以及 具有該樹脂片之液晶顯示裝置。 【先前技術】 液晶顯示裝置之背光中主要使用線狀光源、點狀光源。 為了使該等光源發射之光均勻地擴展至整個畫面上，使用 了稱為光擴散板、光導板之光學板。 光擴散板、光導板等光學板一般包含藉由熱成形而形成 之具有尚透光性之樹脂片。若上述光學板與液晶面板接 觸’則會導致成為不均勻之圖像顯示等液晶顯示裝置之顯 示特性降低（例如，參照專利文獻1 )。 另外，若擴散板與光源之距離變近，則可能有光源之隱 蔽性下降、畫面上出現光源之影像（影）之虞。 【發明内容】 本發明之目的在於提供能夠一種防止不均勻之圖像顯 示’同時能夠提高光源之隱蔽性的樹脂片、及能夠防止不 均勻之圖像顯示且提高光源之隱蔽性的液晶顯示裝置。 為了實現上述目的’本發明之樹脂片，係於具有用於顯 不圖像之液晶面板、與用於將光照射至液晶面板之光源的 液晶顯示裝置中，設置在液晶面板與光源之間者，該樹脂 片具有位於液晶面板側之第1面、及與上述第1面相向之第 2面。上述樹脂片係於配置有第1面之側翹曲成凸狀，第2 153171.doc 201137406 面之中央部之樹脂片的翹曲量為O.i mm〜6.0 mm。 此外’本發明之液晶顯示裝置具有本發明之樹脂片。具 體而言’本發明之液晶顯示裝置具有：用於顯示圖像之液 晶面板、用於將光照射至液晶面板之光源、及處於液晶面 板與光源之間的樹脂片。上述樹脂片具有位於液晶面板側 之第1面、及與第1面相向之第2面。上述樹脂片向液晶面 板側翹曲成凸狀’上述第2面之中央部之樹脂片的翹曲量 為 0·1 mm〜6.0 mm 〇 本發明之樹脂片係，於液晶顯示裝置之設置狀態下，向 接近液晶面板之方向翹曲成為凸狀。然而，第2面之中央 部（最接近液晶面板之部分）的翹曲量抑制為〇丨〜6 〇 因此，於與液晶面板之關係中，能夠於樹脂片與液 晶面板之間充分地設置間隔◦其結果，在上述設置狀態 下，能夠防止樹脂片與液晶面板之接觸，因此能夠防止出 現成為不均勻之圖像顯示的不良狀況。 另一方面，於與光源之關係中，樹脂片向遠離光源之方 向翹曲成為凸狀。而且，樹脂片之翹曲量亦確保為〇ι mm 6.0 mm。因此，與樹脂片向光源側趣曲之情形（正趣 曲）、樹脂片平坦之情形相比，能夠擴大樹脂片與光源之 距離。其結果，能夠提高光源之隱蔽性（燈隱蔽性）。 此外，將翹曲量抑制為最大6 〇 mm，因此亦能夠維持充 分之處理性，亦能夠抑制製造效率之降低。 即，本發明之樹脂片及液晶顯示裝置係，樹脂片向接近 液晶面板之方向具有凸狀之翹曲（反翹曲），而且樹脂片之 J53171.doc 201137406 中央部的翹曲量為0.1 mm〜6.0 mm，由此，能夠維持充分 之處理性，而且能夠兼顧防止不均勻之圖像顯示之不良狀 況的產生、及提高光源隱蔽性。 本發明之樹脂片中’第2面具有相互相向之第1及第2 邊、及與第1及第2邊交又且相互相向之第3及第4邊，第2 面之中央部之樹脂片的翹曲量可由⑴連接第1邊之中心與 第2邊之中心之假想的第1直線與連接第3邊之中心與第斗邊 之中心之假想的第2直線的交點、與（丨丨）包含第i及第2直線 之平面的法線與第2面的交點之間的距離而定義。同樣 地，本發明之液晶顯示裝置中，第2面具有相互相向之第i 及第2邊、與第1及第2邊交又並相互相向之第3及第4邊， 第2面之中央部之樹脂片的翹曲量可由⑴連接第1邊之中心 與第2邊之中心之假想的第丨直線與連接第3邊之中心與第4 邊之中心之假想的第2直線的交點、與（ii)包含第i及第2直 線之平面的法線與第2面的交點之間的距離而定義。 此外，本發明之液晶顯示裝置中，較佳為，樹脂片之與 第2面之中央部對應的第！面之中央部、與液晶面板之間的 距離為5 mni〜10 mm。 於將樹脂片設置於液晶顯示裝置之設置狀態下，若樹脂 片之第1面之中央。[5與液晶面板的距離為51 〇 mm，則 树月曰片與液晶面板之間確保有至少5 mm之間隔。因此，即 使由於液晶顯不裝置使用時之背光之點燈、液晶顯示裝置 長期運送時之周圍氣溫上升等，使得樹脂片向液晶面板之 翹曲$增加，亦可以防止樹脂片與液晶面板之接觸。進 I53171.doc 201137406 而’由於樹脂片與液晶面板之間至少確保有5随之間隔， 因而在樹脂片與液晶面板之間能夠設置擴散膜、棱鏡膜、 反射型偏光分離膜、相位差膜、偏振膜等光學膜。其結 果，不僅能夠防止成為不均勻之圖像顯示之不良狀況的產 生，而且能夠提高液晶顯示裝置之光學特性。 另一方面，由於樹脂片與液晶面板之間的間隔最大為1〇 mm，因此能夠抑制具有液晶面板、樹脂片和光源等之單 元尺寸的大型化（厚型化）。 根據本發明之樹脂片及液晶顯示裝置，在樹脂片設置於 液晶顯示裝置之狀態下，能夠防止樹脂片與液晶面板之接 觸，因此能夠防止成為不均勻之圖像顯示。此外，能夠提 高光源之隱蔽性（燈隱蔽性）。 此外，由於將翹曲量抑制為最大6 〇 mm，因此亦能夠維 持充分之處理性，且亦能夠抑制製造效率之降低。 即，本發明之樹脂片及液晶顯示裝置係，樹脂片向接近 液晶面板之方向具有凸狀之翹曲（反翹曲而且樹脂片之 中央部的赵曲量為0.1 mm〜6.0 mm，由此能夠維持充分之 處理性，而且能夠兼顧防止成為不均勻之圖像顯示之不良 狀況的產生、及提高光源隱蔽性。 【實施方式】 圖1係本發明之一實施形態之液晶顯示裝置之側面示意 圖。圖2係本發明之一實施形態之液晶顯示裝置的立體示 意圖。圖3係用於說明光擴散板之翹曲測定之方法的圖。 液晶顯示裝置1(液晶電視）係所謂之直下型液晶顯示 15317】.doc 201137406 器，其具有背光系統2、配置於背光系統2之前面的液晶面 板3、配置於背光系統2與液晶面板3之間的光學膜4。而 且’圖1及圖2中’方便起見，對於液晶顯示裝置i，以使 其前側面向紙面上側之姿勢進行表示。此外，以下之圖中 表示之液晶顯示裝置1、背光系統2、液晶面板3等各構成 構件的比例尺係’為了說明之方便而分別設定，全部構成 構件之比例尺並不相同。 背光系統2具有薄型箱狀之樹脂製燈箱7、設置於燈箱7 内之複數個線狀光源8、及將燈箱7之開放面9(前面）塞住之 光擴散板（樹脂片）10，該薄型箱狀之樹脂製燈箱7具有長方 形板狀之後壁5及自後壁5之周緣向前方一體地立設之四邊 框狀的側壁6，且前面側開放。 即’箱狀之燈箱7係，燈箱7之開放面9之輪廓由四邊框 狀之側壁6形成，於由側壁6及後壁5包圍之空間内設置有 線狀光源8。於燈箱7之後壁5内面，全部安裝有例如用於 使自線狀光源8入射至後壁5側之光反射至箱之開放面9側 的反射板（未圖示）。 線狀光源8係設置於燈箱7内，因此係設置於液晶面板3 之後方。線狀光源8例如為圓筒狀燈。圓筒狀燈之直徑例 如為2 mm〜4 mm。複數個線狀光源8係以相對於光擴散板 10之背面11隔開固定間隔的狀態，相互平行地隔開相等之 間隔而配置。 關於相鄰之線狀光源8之中心之間的間隔L，自省電之觀 點觀之’較佳為30 mm~60 mm。此外，關於光擴散板1 〇之[Technical Field] The present invention relates to a resin sheet, and more particularly to a resin sheet used in various optical sheet applications provided in a liquid crystal display device and having the resin sheet Liquid crystal display device. [Prior Art] A linear light source and a point light source are mainly used in the backlight of a liquid crystal display device. In order to uniformly spread the light emitted from the light sources to the entire screen, an optical plate called a light diffusing plate and a light guiding plate is used. An optical plate such as a light diffusing plate or a light guiding plate generally includes a resin sheet which is formed by thermoforming and which has a light transmissive property. When the optical plate is in contact with the liquid crystal panel, the display characteristics of the liquid crystal display device such as uneven image display are deteriorated (for example, see Patent Document 1). Further, if the distance between the diffusing plate and the light source is close, there is a possibility that the concealability of the light source is lowered and the image (shadow) of the light source appears on the screen. SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device capable of preventing uneven image display while improving the concealability of a light source, and capable of preventing uneven image display and improving the concealability of a light source. . In order to achieve the above object, the resin sheet of the present invention is provided in a liquid crystal display device having a liquid crystal panel for displaying an image and a light source for irradiating light to the liquid crystal panel, and is disposed between the liquid crystal panel and the light source. The resin sheet has a first surface on the liquid crystal panel side and a second surface facing the first surface. The resin sheet is warped in a convex shape on the side where the first surface is disposed, and the warpage amount of the resin sheet in the central portion of the surface of the second 153171.doc 201137406 is O.i mm to 6.0 mm. Further, the liquid crystal display device of the present invention has the resin sheet of the present invention. Specifically, the liquid crystal display device of the present invention has a liquid crystal panel for displaying an image, a light source for irradiating light to the liquid crystal panel, and a resin sheet between the liquid crystal panel and the light source. The resin sheet has a first surface on the liquid crystal panel side and a second surface facing the first surface. The resin sheet is warped to the liquid crystal panel side in a convex shape. The amount of warpage of the resin sheet in the central portion of the second surface is 0·1 mm to 6.0 mm. The resin sheet of the present invention is placed in a liquid crystal display device. Next, it is warped in a direction close to the liquid crystal panel to be convex. However, the amount of warpage of the central portion of the second surface (the portion closest to the liquid crystal panel) is suppressed to 〇丨6 to 6, so that the gap between the resin sheet and the liquid crystal panel can be sufficiently set in the relationship with the liquid crystal panel. As a result, in the above-described installation state, it is possible to prevent the resin sheet from coming into contact with the liquid crystal panel, and thus it is possible to prevent a problem in which uneven image display occurs. On the other hand, in the relationship with the light source, the resin sheet is warped in a convex shape in a direction away from the light source. Moreover, the amount of warpage of the resin sheet was also ensured to be 〇ι mm 6.0 mm. Therefore, the distance between the resin sheet and the light source can be increased as compared with the case where the resin sheet is interesting to the light source side (positive interest) and the resin sheet is flat. As a result, the concealability of the light source (light concealability) can be improved. Further, since the amount of warpage is suppressed to a maximum of 6 〇 mm, it is possible to maintain sufficient rationality and also to suppress a decrease in manufacturing efficiency. In other words, in the resin sheet and the liquid crystal display device of the present invention, the resin sheet has a convex warp (anti-warpage) in the direction close to the liquid crystal panel, and the warpage amount of the central portion of the resin sheet J53171.doc 201137406 is 0.1 mm. Since it is ~6.0 mm, it is possible to maintain the sufficiency of the sufficiency, and it is possible to prevent the occurrence of defects in uneven image display and to improve the concealability of the light source. In the resin sheet of the present invention, the second surface has the first and second sides facing each other, and the third and fourth sides which are in contact with the first and second sides, and the resin of the central portion of the second surface. The amount of warpage of the sheet may be (1) an imaginary first line connecting the center of the first side and the center of the second side, and an intersection of the imaginary second line connecting the center of the third side and the center of the third side, and (丨)丨) is defined by the distance between the normal of the plane of the i-th and second straight lines and the intersection of the second faces. Similarly, in the liquid crystal display device of the present invention, the second surface has the i-th and the second sides facing each other, and the third and fourth sides which face the first and second sides and face each other, and the center of the second side The amount of warpage of the resin sheet of the portion may be (1) an imaginary second line connecting the center of the first side and the center of the second side, and an intersection of the imaginary second line connecting the center of the third side and the center of the fourth side, It is defined by the distance between (ii) the intersection of the normal line including the plane of the i-th and second straight lines and the second surface. Further, in the liquid crystal display device of the present invention, it is preferable that the resin sheet corresponds to the central portion of the second surface! The distance between the center of the face and the LCD panel is 5 mni to 10 mm. The resin sheet is placed in the center of the first surface of the resin sheet in the state in which the liquid crystal display device is placed. [5 The distance from the LCD panel is 51 〇 mm, and a gap of at least 5 mm is ensured between the tree and the liquid crystal panel. Therefore, even if the backlight of the liquid crystal display device is used, the ambient temperature rises during long-term transportation of the liquid crystal display device, etc., the warpage of the resin sheet to the liquid crystal panel is increased, and the contact between the resin sheet and the liquid crystal panel can be prevented. . I53171.doc 201137406 and 'Because at least 5 spaces are provided between the resin sheet and the liquid crystal panel, a diffusion film, a prism film, a reflective polarization separation film, a retardation film, and the like can be provided between the resin sheet and the liquid crystal panel. An optical film such as a polarizing film. As a result, not only the occurrence of a problem of uneven image display but also the optical characteristics of the liquid crystal display device can be improved. On the other hand, since the interval between the resin sheet and the liquid crystal panel is at most 1 〇 mm, it is possible to suppress an increase in size (thickness) of a unit having a liquid crystal panel, a resin sheet, and a light source. According to the resin sheet and the liquid crystal display device of the present invention, since the resin sheet can be prevented from coming into contact with the liquid crystal panel in a state where the resin sheet is provided on the liquid crystal display device, uneven image display can be prevented. In addition, the concealability of the light source (light concealability) can be improved. Further, since the amount of warpage is suppressed to a maximum of 6 〇 mm, it is possible to maintain sufficient sufficiency and also to suppress a decrease in manufacturing efficiency. In other words, in the resin sheet and the liquid crystal display device of the present invention, the resin sheet has a convex warp in a direction close to the liquid crystal panel (anti-warpage and the amount of curvature in the central portion of the resin sheet is 0.1 mm to 6.0 mm, thereby maintaining The sufficiency is rational, and it is possible to prevent the occurrence of a problem of uneven image display and improve the concealability of the light source. [Embodiment] FIG. 1 is a side view of a liquid crystal display device according to an embodiment of the present invention. 2 is a schematic perspective view of a liquid crystal display device according to an embodiment of the present invention. Fig. 3 is a view for explaining a method of measuring warpage of a light diffusing plate. The liquid crystal display device 1 (liquid crystal television) is a so-called direct type liquid crystal display 15317. 】doc 201137406, which has a backlight system 2, a liquid crystal panel 3 disposed in front of the backlight system 2, and an optical film 4 disposed between the backlight system 2 and the liquid crystal panel 3. Moreover, 'the convenience of 'Fig. 1 and Fig. 2' In the liquid crystal display device i, the front side surface is shown on the paper surface side. Further, the liquid crystal display device 1 and the backlight shown in the following drawings are shown. The scales of the respective components of the system 2, the liquid crystal panel 3, and the like are set separately for convenience of explanation, and the scales of all the constituent members are different. The backlight system 2 has a thin box-shaped resin light box 7 and is disposed in the light box 7. a plurality of linear light sources 8 and a light diffusing plate (resin sheet) 10 for plugging the open surface 9 (front surface) of the light box 7, the thin box-shaped resin light box 7 having a rectangular plate-shaped rear wall 5 and a rear wall The peripheral edge of 5 is integrally formed with four frame-shaped side walls 6 and the front side is open. That is, the box-shaped light box 7 is formed, and the outline of the open surface 9 of the light box 7 is formed by the four-frame-shaped side wall 6. A linear light source 8 is disposed in a space surrounded by the side wall 6 and the rear wall 5. On the inner surface of the wall 5 after the light box 7, all of the light, for example, for reflecting the light from the linear light source 8 to the side of the rear wall 5 is reflected to the open surface of the box. a reflection plate (not shown) on the side 9. The linear light source 8 is provided in the light box 7, and is provided behind the liquid crystal panel 3. The linear light source 8 is, for example, a cylindrical lamp. 2 mm to 4 mm. Multiple linear light sources 8 are The state in which the back surface 11 of the light-diffusing sheet 10 is spaced apart from each other at a fixed interval is disposed at equal intervals in parallel with each other. Regarding the interval L between the centers of the adjacent linear light sources 8, the viewpoint of self-power saving is considered It is preferably 30 mm to 60 mm. In addition, regarding the light diffusing plate 1
S 153171.doc 201137406 背面11之中央部12(中央部12之詳細情況於後述）與線狀光 源8之中心的距離D，自薄型化之觀點觀之，較佳為1〇 mm〜20 mm。此外，間隔L與距離D之比率（L/D)較佳為 2.5 4.0特別地’間隔L較佳為40 mm〜55 mm，距離交 佳為13 mm〜17 mm ^此外，線狀光源8之數量必然由燈箱7 之尺寸（液晶顯示裝置丨之畫面尺寸）及間隔L決定，例如， 於32型之液晶顯示裝置，較佳為6〜1〇根。再有，圖夏及 圖2中，為了容易圖解，僅表示出5根線狀光源8。 此外，線狀光源8之示例係公知之筒形燈。公知之筒形 燈之示例係螢光燈（冷陰極管）、商素燈、鎢燈等。此外， 背光系統2之光源，可以例如代替線狀光源8而使用發光二 極體（LED)等點狀光源等。 光擴散板10形成為與由燈箱7之側壁6之框形狀所包圍的 區域大致相同的大小之長方形板狀。光擴散板1〇係具有固 定板厚之板狀體。光擴散板10具有作為與液晶面板3之相 向面的前面（第1面）13、及與前面13相向之背面（第2 面）11。關於光擴散板1〇，在安裝於背光系統2之狀態下， 具有光擴散板10之前面（第1面）π(與液晶面板3之相向面） 向液晶面板3側成為凸狀的翹曲。光擴散板1〇之翹曲量（以 下簡稱為「翹曲量」）W可定義為如下交點之間的距離， 即’（1)連接背面11之第1邊之中心與第2邊之中心之假想的 第1直線與連接背面11之第3邊之中心與第4邊之中心之假 想的第2直線的交點、與（π)包含第1及第2直線之平面的法 線與背面11之交點之間的距離。其中，第1邊及第2邊相 15317l.doc 201137406 向’第3邊及第4邊相向。此時，翹曲量w，可採用例如圖 3所示之方法測定。 > ,、、'圖3，首先，以2點吊下光擴散板丨〇，以使光擴散板 10之長度方向為水平。在如此吊下光擴散板10之狀態下， 於光擴散板10之背面（第2面）11側，在上下方向（上端14中 央-下端15中央之間）及左右方向（左端16中央右端口中央 之間）各拉有1根線1 8、丨9。 而且，將自線18與線19之交點20向背面11垂下之垂線21 與光擴散板10之背面u相交的部分，設定為光擴散板1〇之 中央部12(光擴散板1〇上，於前面13及背面u分別存在中 央部）。翹曲量w可藉由利用規尺等測定背面u之中央部12 與交點20的距離而求出。如此測定之翹曲量w為〇^ mm〜6.0 mm，較佳為} 〇 mm〜3 〇 mm。 液晶面板3形成為大小與光擴散板1〇大致相同的長方形 板狀。液晶面板3之表面為平坦（無勉曲）。平坦之液晶面板 3的背面25與光擴散板10之前面13的中央部之間設有距離 D。距離D’例如為5 mm〜1〇 mme距離D·較佳為5瓜爪〜7 mm 〇 此外，液晶面板3具有液晶單元22及1對偏振片23、24〇 1對偏振片23、24係於液晶面板3之厚度方向上自兩側夾著 液晶單元2 2。如此之液晶面板3係配置於背光系統2之前 面，以使後側之偏振片24與光擴散板10相向。 作為液晶單元22，可使用TFT型液晶單元、STN型液晶 單元等公知之液晶單元。 15317l.d〇( 201137406 &光學膜4並無特別限制。光學膜4例如為不具有抗靜電性 月<=* ( P不3有抗靜電劑)之膜，且為光擴散板】_之面(與光 散板0相向之面）之表面電阻值（例如’依據JIS K6911) 具有規定的值之膜。上述規定的值例如為ΐχΐ〇,3以口以 上。上述規定的值較佳為1χ1〇,3Ω/口〜1χ1〇Ι6Ω/〇。光學膜4 之更具體之示例係，具有上述表面電阻值之擴散膜、稜鏡 膜反射型偏光分離膜、相位差膜、偏振膜等。 作為擴散膜，並無特別限制。擴散膜例如係於透明樹脂 膜之一面利用黏合劑固定有珠粒之膜等。 稜鏡膜係藉由一方面擴散一方面透過光擴散板1〇之透射 光在法線方向上集光，以高亮度對前面側進行照明的膜。 稜鏡膜例如係，於光擴散板1〇之相向面之相反側的整個面 上設置有微細之稜鏡、微細之凸透鏡及雙凸透鏡等微細之 集光性透鏡的片等。棱鏡膜之市售品例如係，住友3 μ股 份有限公司製造之「BEF(Brightness Enhancement Film)」、 SEKISUI FILM公司製造之「ESTINA」、GE塑料公司製造 之「illuminexADFfilm」等。S 153171.doc 201137406 The distance D between the central portion 12 of the back surface 11 (details of the central portion 12 will be described later) and the center of the linear light source 8 is preferably 1 mm to 20 mm from the viewpoint of thinning. Further, the ratio (L/D) of the interval L to the distance D is preferably 2.5 4.0, particularly 'the interval L is preferably 40 mm to 55 mm, and the distance is preferably 13 mm to 17 mm ^ In addition, the linear light source 8 The number is necessarily determined by the size of the light box 7 (the screen size of the liquid crystal display device) and the interval L. For example, in the liquid crystal display device of the 32 type, it is preferably 6 to 1 inch. Further, in Figs. 2 and 2, only five linear light sources 8 are shown for ease of illustration. Further, an example of the linear light source 8 is a known tubular lamp. Examples of known cylindrical lamps are fluorescent lamps (cold cathode tubes), commercial lamps, tungsten lamps, and the like. Further, as the light source of the backlight system 2, for example, a point light source such as a light emitting diode (LED) can be used instead of the linear light source 8. The light diffusing plate 10 is formed in a rectangular plate shape having substantially the same size as the area surrounded by the frame shape of the side wall 6 of the light box 7. The light diffusing plate 1 has a plate-like body having a fixed plate thickness. The light diffusing plate 10 has a front surface (first surface) 13 as a surface facing the liquid crystal panel 3 and a back surface (second surface) 11 facing the front surface 13. In the state in which the light diffusing plate 1 is attached to the backlight system 2, the front surface (first surface) π (opposing surface facing the liquid crystal panel 3) of the light diffusing plate 10 is convexly curved toward the liquid crystal panel 3 side. . The amount of warpage of the light diffusing plate 1 (hereinafter simply referred to as "warping amount") W can be defined as the distance between the intersections, that is, '(1) connecting the center of the first side of the back surface 11 with the center of the second side The intersection of the first straight line and the virtual second line connecting the center of the third side of the back surface 11 and the center of the fourth side, and (π) the normal and the back surface of the plane including the first and second straight lines The distance between the intersections. Among them, the first side and the second side phase 15317l.doc 201137406 face toward the '3rd side and the 4th side. At this time, the amount of warpage w can be measured by, for example, the method shown in Fig. 3. > , , 'Figure 3, first, the light diffusing plate is suspended at two points so that the longitudinal direction of the light diffusing plate 10 is horizontal. In the state in which the light diffusing plate 10 is suspended, the back surface (second surface) 11 side of the light diffusing plate 10 is in the vertical direction (between the center of the upper end 14 and the center of the lower end 15) and the left and right direction (the left end 16 is the center right port). There is one line 1 8 and 丨 9 between the centers. Further, a portion where the perpendicular line 21 which is dropped from the intersection point 20 of the line 18 and the line 19 to the back surface 11 and the back surface u of the light diffusion plate 10 is set as the central portion 12 of the light diffusion plate 1 (on the light diffusion plate 1) There is a central portion on the front surface 13 and the back surface u, respectively. The amount of warpage w can be obtained by measuring the distance between the central portion 12 of the back surface u and the intersection point 20 by using a gauge or the like. The amount of warpage w thus determined is 〇^ mm to 6.0 mm, preferably 〇 mm to 3 〇 mm. The liquid crystal panel 3 is formed in a rectangular plate shape having substantially the same size as that of the light diffusing plate 1''. The surface of the liquid crystal panel 3 is flat (no distortion). A distance D is provided between the back surface 25 of the flat liquid crystal panel 3 and the central portion of the front surface 13 of the light diffusing plate 10. The distance D' is, for example, 5 mm to 1 mm. The distance D is preferably 5 cubits to 7 mm. Further, the liquid crystal panel 3 has a liquid crystal cell 22 and a pair of polarizing plates 23, 24 〇 1 and polarizing plates 23 and 24 The liquid crystal cell 22 is sandwiched from both sides in the thickness direction of the liquid crystal panel 3. The liquid crystal panel 3 is disposed in front of the backlight system 2 such that the polarizing plate 24 on the rear side faces the light diffusing plate 10. As the liquid crystal cell 22, a known liquid crystal cell such as a TFT liquid crystal cell or an STN liquid crystal cell can be used. 15317l.d〇 (201137406 & optical film 4 is not particularly limited. The optical film 4 is, for example, a film having no antistatic property, <=* (P3 has an antistatic agent), and is a light diffusing plate] The surface resistance value (for example, 'in accordance with JIS K6911') has a predetermined value. The above-mentioned predetermined value is, for example, ΐχΐ〇, 3 or more. The above-mentioned predetermined value is preferable. It is 1 χ 1 〇, 3 Ω / port 〜 1 χ 1 〇Ι 6 Ω / 〇. A more specific example of the optical film 4 is a diffusion film having the above surface resistance value, a ruthenium film reflection type polarization separation film, a retardation film, a polarizing film, or the like. The diffusion film is not particularly limited. The diffusion film is, for example, a film in which a bead is fixed to one surface of a transparent resin film by a binder. The film is diffused on the one hand and transmitted through the light diffusion plate 1 A film that illuminates the front side in a normal direction and illuminates the front side with high brightness. For example, the ruthenium film is provided with a fine 稜鏡, fine convex lens on the entire surface opposite to the opposite side of the opposite surface of the light diffusion plate 1 〇 And a sheet of a fine collection lens such as a lenticular lens. Commercially available products such as the manufacture of the mirror film of the manufacturing system, parts manufactured by Sumitomo Company Limited of 3 μ "BEF (Brightness Enhancement Film)", SEKISUI FILM company "ESTINA", GE Plastics' illuminexADFfilm "and the like.
反射型偏光分離膜係，具有使某種偏振光透過、且將具 有與其相反之性質之偏振光反射的性質之膜。反射型偏光 分離膜例如係，使特定振動方向之直線偏振光透過、將與 該方向正交之振動方向之直線偏振光反射的反射型直線偏 光分離膜；使規定之旋轉方向之圓偏光透過、將沿與該旋 轉方向相反之方向旋轉之圓偏光反射的反射型圓偏光分離 膜等。反射型直線偏光分離膜之市售品例如係，住友3M I53l71.doc •10· 201137406 股份有限公司製造之「DBEF(Dual Brightness Enhancement Film)」、曰東電工股份有限公司製造之「ΝΙρ〇χ」等。 相位差膜係藉由樹脂膜之延伸而具有相位差 (retardation)的膜。相位差膜例如為，聚碳酸酯系樹脂 膜、聚砜系樹脂膜、聚醚砜系樹脂膜、聚芳酯系樹脂膜、 降福烯系樹脂膜等。相位差膜之市售品例如為，KANEKA 公司製造之「ELMEC」、住友化學股份有限公司製造之 「Sumikalite」等。 偏振膜係’例如對聚乙烯醇實施拉伸加工及利用蛾或二 色性染料進行之染色加工，使該峨或二色性染料吸附取向 而成者’使與其取向方向正交之振動方向之直線偏振光透 過’吸收振動方向與取向方向相同之直線偏振光。偏振膜 之市售品例如係，日東電工股份有限公司製造之 「NPF」' 住友化學股份有限公司製造之r sumIKARAN」 等。 <光擴散板之構成> 圖4係光擴散板之立體示意圖β圖5係表示光擴散板（切 割線V-V上之剖面）對於燈箱之安裝狀態之燈箱的主要部分 剖面圖。 如圖4所示，光擴散板10係於厚度方向上積層有2片樹脂 層之光透過性的2層光擴散板。光擴散板1〇具有相對厚的 基材層26及相對薄的背面層27。 在光擴散板10中之基材層26側之主面（光擴散板1〇之前 面13) ’以條紋狀形成有多個延伸在光擴散板丨〇之1組相向 153171.doc • 11 · 201137406 周緣間的柱面透鏡形狀之半圓凸部28。 柱面透鏡形狀之半圓凸部28係與半圓凸部28之長度方向 正交的切割面具有大致半圓弧狀之輪廓的凸部。多個半圓 凸部28相互平行地隔開相等之間隔E(間隔E例如為i μιη〜15 μιη)而配置。相鄰之半圓凸部28之中心之間的距離（間距ρ·) 例如為10 μπι〜500 μιη。此外，半圓凸部28之高度Η，與間距 Ρ’之比率（Η’/Ρ，）例如為0.2〜0.8 » 另一方面，在光擴散板1〇中之背面層27側之主面（光擴 散板10之背面11)，藉由壓花加工而形成有多個微細之凹 凸29。祕細之凹凸29大致均勻地分佈於整個背面11β背面 層27側之主面（背面11)成為全體形成有微細之凹凸29的糙 面。 微細之凹凸29之形狀，例如可以由表面之粗糙度表示。 作為一例，微細之凹凸29之算術平均粗糙度Ra(依據JIS B0601-2001)為〇·8 μηι〜5.〇 μπΐβ此外，微細之凹凸29之十 點平均粗糙度Rz(依據JIS Β06〇1·2〇〇1)為8 〇 μιη〜3〇 〇 。 此外，微細之凹凸29之平均間隔Rsm(依據JIS β〇6〇ι_2〇〇ι) 為 100 μπι〜400 μπι。 此外，如圖5所示，將基材層26之厚度ti與背面層”之厚 度h相加所得的光擴散板1〇之總厚度τ例如為丨〇 mm〜3 〇 mm。總厚度τ較佳為丨2 _〜2 〇 _。此外基材層“之 厚度例如為〇.95 _〜2 95咖。此外，背面㈣之厚“ 例如為 0.03 mrn〜0.1 mm。 作為光擴散板10之原料，並無特別限制^作為光擴散板 I53l71.doc •12- 201137406 10之原料，可以使用例如具有0.2%〜2.0%之吸水率之公知 的透光性樹脂。 可使用之透光性樹脂之具體例為：丙烯酸系樹脂、苯乙 烯系樹脂、聚碳酸酯、聚乙烯、聚丙烯、環狀聚烯烴、環 狀烯烴共聚物、聚對苯二曱酸乙二醇酯、MS樹脂（甲基丙 烯酸甲酯·苯乙烯共聚物樹脂）、ABS樹脂（丙烯腈-丁二烯- 苯乙烯共聚物樹脂）、AS樹脂（丙烯腈-苯乙烯共聚物樹脂） 等。 上述透光性樹脂可單獨使用或者將2種以上併用。此 外’其等之中’較佳的可列舉苯乙烯系樹脂，更佳的可列 舉苯乙烯系樹脂之單獨使用。 此外’用作基材層26之原料的樹脂（A)與用作背面層27 之原料的樹脂（B)可以相同，亦可以不同。作為樹脂（A)與 樹脂（B)之組合，較佳的可以列舉同種透光性樹脂之組 合，更佳的可以列舉在樹脂（A)及樹脂（B)中均含有苯乙烯 系樹脂之組合，尤佳的可以列舉樹脂（A)及樹脂（B)中均單 獨使用本乙稀糸樹脂之組合。 此外，光擴散板10中，根據需要可含有光擴散劑（光擴 散粒子）。 作為光擴散劑，只要是折射率與構成光擴散板1〇之透光 性樹脂不同且能夠擴散透射光之粒子，則無特別限制。無 機系之光擴散劑例如為：碳酸鈣、硫酸鋇、氧化鈦、氫氧 化I呂 '二氧化石夕、玻璃、滑石、雲母、白炭黑、氧化鎮、 氧化辞等。其等可以為利用脂肪酸等實施表面處理後之產 153171.doc -13- 201137406 物。 此外，有機系之光擴散劑例如為苯乙烯系聚合物粒子、 丙烯酸系聚合物粒子、矽氧烷系聚合物粒子等。較佳的有 機系之光擴散劑例如為，重量平均分子量為5〇萬〜5〇〇萬之 同刀子量聚合物粒子、溶解於丙_時之凝膠分率為1〇質量 %以上之交聯聚合物粒子。 上述光擴散劑可以單獨使用或者併用2種以上。 當光擴散板ίο含有光擴散劑時，光擴散劑之配合量係， 相對於透光性樹脂100重量份，為〇 〇〇1重量份〜丨重量份， 較佳為0.001重量份〜0.01重量份。此外，光擴散劑可以作 為與上述透光性樹脂組合之母料使用。此外，自光擴散性 之觀點出發’透光性樹脂之折射率與光擴散劑之折射率之 差的絕對值通常為〇·〇1〜〇 2〇，較佳為〇 〇2〜〇 15。 此外，光擴散板10中，根據需要亦可添加例如紫外線吸 收劑、熱穩定劑、抗氧化劑、耐候劑、光穩定劑、螢光增 白劑、加工穩定劑等各種添加劑。 作為紫外線吸收劑，並無特別限制。紫外線吸收劑例如 為：水揚酸苯酯系紫外線吸收劑、二苯甲酮系紫外線吸收 劑、三嗪系紫外線吸收劑、苯并***系紫外線吸收劑等。 添加紫外線吸收劑時，相對於透光性樹脂100重量份，較 佳為添加0.1重量份〜3重量份之紫外線吸收劑。若為上述 範圍，則能夠抑制紫外線吸收劑向表面之滲出，從而能夠 良好地維持光擴散板之外觀。 作為熱穩定劑，並無特別限制。熱穩定劑例如可舉出錳 153171.doc • 14· 201137406 化合物、銅化合物等。添加熱穩定劑時，較佳為*紫外線 吸收劑-併添加’相對於透光性樹脂中之紫外線吸收劑t 重量份，以2重量份以下之比例添加熱穩定劑，相對於透 光性樹脂中之料線吸收#11重量份，更較佳為添加〇〇ι 重量份〜1重量份之熱穩定劑。 此外’作為抗氧化劑’並無特別㈣卜抗氧化劑例如可 列舉受阻酚化合物、受阻胺化合物等。添加抗氧化劑時， 相對於透光性樹脂⑽重量份，㈣為 量份之抗氧化劑。 此外’在光擴散板1G中，根據需要可以在透光性樹脂中 混合抗靜電劑’亦可在光擴散板1G之前面13及/或背面u 塗佈抗靜電劑。 此外，光擴散板1 0如圖5所示，在相對於燈箱7内的線狀 光源8,半圓凸部28為平行的位置，使光擴散板1〇之背面 11抵接於燈箱7之側壁6，且固定於燈箱7。由此，藉由光 擴散板10將燈箱7之開放面9塞住。 <光擴散板（積層樹脂片）之製造方法> 上述光擴散板10,可藉由對採用下述方法製造之積層樹 脂片進行切割而製作。 圖6係本發明之一實施形態之樹脂片之製造方法中使用 的製造裝置的概略構成圖。圖7係安裝於上輥之凹版轉印 模之主要部分剖面圖。圖8係安裝於中間輥之糙面轉印模 的主要部分剖面圖。 片製造裝置51具有：片成型機52，其將原料樹脂呈片狀 153171.doc 201137406 擠出而使其成型；-組擠壓用輥組54,其用於藉由擠壓而 使擠出之積層樹脂片53成型；及搬運用輥組55與送風機 56,其用於搬運由擠壓用輥組54成型之積層樹脂片。 片成型機52具有：第1擠出機57，其用於將基材層 26之 原料树月曰（A)加熱熔融；第2擠出機5 8，其用於將背面層27 之原料樹脂（B)加熱熔融；進料塊（feed bl〇ck)59，其供給 經第1及第2擠出機57、58熔融之樹脂；及模頭6〇，其用於 以片狀態擠出進料塊59内之樹脂。 作為第1及第2擠出機57、58，可使用公知之擠出成型 機。公知之擠出成型機例如為單轴擠出機、雙軸擠出機 等。第1及第2擠出機57、58中，安裝有用於將樹脂投入至 擠出機之氣缸内的料斗61、62。 作為進料塊59，只要能夠將2種以上之樹脂供給至模頭 60、且在積層之狀態下共擠出的型式，則並無特別限制。 作為進料塊59,可以使用公知之進料塊。公知之進料塊例 如為2種3層分配型或2種2層分配型之進料塊。 作為模頭60，只要為共擠出用之模頭，則並無特別限 制。作為模頭6Q，可以使用公知之模頭。公知之模頭例如 為多歧管模頭等。 擠壓用輥組54具有3個擠壓輥63〜65，其等作為一方面藉 擠C而使積層樹脂片53成形，一方面藉由轉印模而於積 層樹脂片53之上下表面75、76(上表面76為光擴散板忉之 背面11，下表面75為光擴散板1〇之前面13)形成凹凸的機 構。 153171.doc -16- 201137406 3個擠壓輥63〜65，分別包含圓柱狀之金屬製（例如不鏽 鋼製、鋼鐵製等）輥。3個擠壓輥63〜65係以各擠壓輥63〜65 之軸線為水平之方式配置。此外，3個擠壓輥63〜65係自上 依次為上輥63、中間輥64及下輥65 ,以彼此之軸線平行之 方式連續配置在鉛直方向。馬達（未圖示）分別與擠壓輥 63〜65之旋轉轴連接。上輥63及下輥65可順時針旋轉，中 間輥64可逆時針旋轉。即，擠壓輥63〜65係自上依次為 「可順時針旋轉」、「可逆時針旋轉」、「可順時針旋轉」。 由此，能夠在所有輥63〜65夾著積層樹脂片53之狀態下同 步旋轉。因此，能夠一方面對自片成型機52擠出之積層樹 脂片53的兩面75、76實施加工一方面自下方搬運至上方， 且送出至搬運用輥組55。 各擠壓輥63〜65之直徑例如為1〇〇 mm〜5〇〇 mm。此外， 使用金屬製輥作為擠壓輥63〜65時，可對各擠壓輥63〜65之 表面實施例如鍍鉻、鍍銅、鍍鎳、鍍Ni-P等鍍敷處理。 於上輥63之周面66,安裝有用於在積層樹脂片53上形成 半圓凸部28之凹版轉印模67。 在凹版轉印模67中，如圖7所示，沿上輥63之圓周方向 以條紋狀形成多個與柱面透鏡形狀之半圓凸部28形狀相反 的凹槽72。即，凹槽72之與凹槽72之長度方向（圓周方向） 正父的切割面具有大致半圓孤狀之輪廓。凹槽72之深度H 比半圓凸部28之高度H，略大（例如3 μιη〜45〇 μπι)。此外， 相鄰之凹槽72之中心之間的距離（間距ρ)可根據半圓凸部 28之形狀適當確定。半圓凸部28之高度Η，與凹槽72之深度 153171.doc •17- 201137406 Η之差係起因於，將凹版轉印模67轉印於積層樹脂片53上 而形成半圓凸部28時之轉印率（H7H)(%)。 在中間輥64之周面68，安裝有例如用於在積層樹脂片53 上形成微細之凹凸29的糙面轉印模69。 在糙面轉印模69中，如圖8所示，在中間輥Μ之周面Μ 上形成有多個壓花形狀，該等壓花形狀包含形狀與光擴散 板10之背面11的微細之凹凸29相反的微細之凹凸71。即， 糙面轉印模69之表面成為了包含微細之凹凸71的壓花形狀 大致均句刀佈在整個表面上的趟面。縫面轉印模69之表面 之算術平均粗糙度Ra例如為6.0 μιη〜8·0 μιη，糙面轉印模 69之表面之十點平均粗糙度Rz例如為45 〇 μιη〜5〇 〇 ， 心面轉印模69之表面之平均間隔Rsm例如為12〇 μηι 〇 上述糙面轉印模69及凹版轉印模67之原料例如為有機材 料。 作為有機材料，只要具有即使對在加熱熔融狀態下自模 頭60剛擠出後的積層樹脂片53反覆擠壓亦能夠維持轉印模 之形狀的耐熱性即可。有機材料例如為熱固性樹脂、熱塑 性樹脂等樹脂。 熱固性樹脂例如為：酚醛樹脂、環氧樹脂、三聚氰胺樹 脂、尿素樹脂、聚醯亞胺樹脂（ρι樹脂）、不飽和聚酯樹 脂、醇酸樹脂等。 熱塑性樹脂例如為：苯乙烯系樹脂、丙烯酸系樹脂、聚 乙烯樹脂、聚丙烯樹脂、環狀烯烴聚合物樹脂、丙烯腈- 153171.doc • 18 · 201137406 丁一稀-苯乙烯樹脂（ABS樹脂）、聚對苯二甲酸乙二醇酯樹 脂（PET樹脂）、聚碳酸酯樹脂（PC樹脂）、聚醚颯樹脂（PES 樹脂）、熱塑性聚醯亞胺樹脂（PI樹脂）等。 其等之中’較佳的可以列舉維卡軟化點（JIS K7206-1999 Λ50法）比自模頭6〇擠出之積層樹脂片兄的維卡軟化點高 C以上的熱塑性樹脂、經交聯的熱塑性樹脂》 下輕65之周面70例如藉由實施鏡面加工而成為平滑面。 再有’链面轉印模69可以安裝於上輥63，凹版轉印模67 可以女裝於中間輥64。此外，中間親64之周面68可藉由實The reflective polarized light separation film has a property of transmitting a certain polarized light and reflecting a polarized light having a property opposite thereto. The reflective polarization separation film is, for example, a reflection type linear polarization separation film that transmits linearly polarized light in a specific vibration direction and reflects linearly polarized light in a direction perpendicular to the direction; and transmits circularly polarized light in a predetermined rotation direction. A reflective circularly polarizing separation film or the like that reflects a circularly polarized light that rotates in a direction opposite to the direction of rotation. For example, the "DBEF (Dual Brightness Enhancement Film)" manufactured by Sumitomo Electric Co., Ltd. and the "ΝΙρ〇χ" manufactured by Mindong Electric Co., Ltd. are manufactured by Sumitomo 3M I53l71.doc •10·201137406. Wait. The retardation film is a film having a retardation by extension of a resin film. The retardation film is, for example, a polycarbonate resin film, a polysulfone resin film, a polyether sulfone resin film, a polyarylate resin film, a norbornene resin film, or the like. Commercial products of the retardation film are, for example, "ELMEC" manufactured by KANEKA Co., Ltd., "Sumikalite" manufactured by Sumitomo Chemical Co., Ltd., and the like. The polarizing film system 'for example, a polyvinyl alcohol is subjected to a drawing process and a dyeing process using a moth or a dichroic dye, and the bismuth or the dichroic dye is adsorbed and oriented to cause a vibration direction orthogonal to the orientation direction thereof. The linearly polarized light passes through a linearly polarized light that absorbs the same direction of vibration as the orientation direction. The commercially available product of the polarizing film is, for example, "NPF" manufactured by Nitto Denko Co., Ltd., r sumIKARAN manufactured by Sumitomo Chemical Co., Ltd., and the like. <Configuration of light diffusing plate> Fig. 4 is a perspective view showing a light diffusing plate. Fig. 5 is a cross-sectional view showing a main portion of a light box in which a light diffusing plate (a cross section on a cutting line V-V) is attached to a light box. As shown in Fig. 4, the light diffusing plate 10 is a two-layer light diffusing plate in which light transmittance of two resin layers is laminated in the thickness direction. The light diffusing plate 1 has a relatively thick base material layer 26 and a relatively thin back surface layer 27. The main surface of the light-diffusing sheet 10 on the side of the base material layer 26 (front surface 13 of the light-diffusing sheet 1) is formed in a stripe shape with a plurality of groups extending toward the light-diffusing sheet 153171.doc • 11 · 201137406 The semicircular convex portion 28 of the cylindrical lens shape between the circumferences. The semicircular convex portion 28 of the cylindrical lens shape has a convex portion having a substantially semi-arc-shaped contour on the cutting surface orthogonal to the longitudinal direction of the semicircular convex portion 28. The plurality of semicircular convex portions 28 are arranged in parallel with each other at equal intervals E (the interval E is, for example, i μm to 15 μm). The distance (pitch ρ·) between the centers of the adjacent semicircular projections 28 is, for example, 10 μm to 500 μm. Further, the height Η of the semicircular convex portion 28 and the ratio of the pitch Ρ' (Η'/Ρ,) are, for example, 0.2 to 0.8. On the other hand, the main surface of the back surface layer 27 side in the light diffusing plate 1〇 (light) A plurality of fine irregularities 29 are formed by embossing on the back surface 11) of the diffusion plate 10. The fine unevenness 29 is distributed substantially uniformly over the entire back surface 11β on the back surface layer 27 side (back surface 11) to form a rough surface in which fine irregularities 29 are formed as a whole. The shape of the fine unevenness 29 can be expressed, for example, by the roughness of the surface. As an example, the arithmetic mean roughness Ra of the fine unevenness 29 (according to JIS B0601-2001) is 〇·8 μηι 5 to 5.μπΐβ, and the ten-point average roughness Rz of the fine unevenness 29 (according to JIS Β06〇1· 2〇〇1) is 8 〇μιη~3〇〇. Further, the average interval Rsm (according to JIS β〇6〇ι_2〇〇ι) of the fine unevenness 29 is 100 μπι to 400 μπι. Further, as shown in Fig. 5, the total thickness τ of the light diffusing plate 1 所得 obtained by adding the thickness ti of the base material layer 26 to the thickness h of the back surface layer is, for example, 丨〇mm 〜3 〇mm. Preferably, the thickness of the substrate layer is 〇.95 _~2 95 咖. In addition, the thickness of the back surface (4) is, for example, 0.03 mrn to 0.1 mm. As a raw material of the light diffusing plate 10, there is no particular limitation. As a raw material of the light diffusing plate I53l71.doc • 12-201137406 10, for example, 0.2% can be used. A known translucent resin having a water absorption of 2.0%. Specific examples of translucent resins that can be used are: acrylic resin, styrene resin, polycarbonate, polyethylene, polypropylene, cyclic polyolefin, and ring. Olefin copolymer, polyethylene terephthalate, MS resin (methyl methacrylate styrene copolymer resin), ABS resin (acrylonitrile-butadiene-styrene copolymer resin), AS Resin (acrylonitrile-styrene copolymer resin), etc. The above-mentioned translucent resin may be used alone or in combination of two or more. Among them, a styrene resin is preferable, and more preferably, a styrene resin is used. The styrene resin is used alone. Further, the resin (A) used as a raw material of the base material layer 26 may be the same as or different from the resin (B) used as a raw material of the back surface layer 27. As the resin (A) and the resin a combination of (B), preferably A combination of the same kind of translucent resin may be mentioned, and a combination of a styrene resin in both the resin (A) and the resin (B) is more preferable, and a resin (A) and a resin (B) are preferable. In addition, the light diffusing plate 10 may contain a light diffusing agent (light diffusing particle) as needed. As the light diffusing agent, as long as it is a refractive index and a light diffusing plate The light-sensitive resin is not particularly limited as long as it can diffuse the light-transmitting particles. The inorganic light-diffusing agent is, for example, calcium carbonate, barium sulfate, titanium oxide, hydrogen peroxide, ruthenium dioxide, glass, talc, mica. , white carbon black, oxidized town, oxidized, etc. These may be those produced by surface treatment with fatty acids, etc. 153171.doc -13 - 201137406. In addition, the organic light diffusing agent is, for example, styrene polymer particles. The acrylic polymer particles, the siloxane polymer particles, etc. The preferred organic light diffusing agent is, for example, a polymer having a weight average molecular weight of 50,000 to 50,000, which is melted with the same amount of the polymer. The cross-linked polymer particles having a gel fraction of 5% by mass or more at 5% by weight. The above-mentioned light-diffusing agents may be used singly or in combination of two or more kinds. When the light diffusing plate contains a light diffusing agent, the light diffusing agent The blending amount is 〇〇〇1 part by weight to 丨 parts by weight, preferably 0.001 part by weight to 0.01 part by weight, based on 100 parts by weight of the light-transmitting resin. Further, the light diffusing agent may be used as the light-transmitting resin described above. Further, from the viewpoint of light diffusibility, the absolute value of the difference between the refractive index of the light-transmitting resin and the refractive index of the light diffusing agent is usually 〇·〇1 to 〇2〇, preferably 〇. 〇2 to 〇15. Further, various additives such as an ultraviolet absorber, a heat stabilizer, an antioxidant, a weather resistance agent, a light stabilizer, a fluorescent whitening agent, and a processing stabilizer may be added to the light diffusion plate 10 as needed. . The ultraviolet absorber is not particularly limited. The ultraviolet absorber is, for example, a phenyl salicylate-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, a triazine-based ultraviolet absorber, or a benzotriazole-based ultraviolet absorber. When the ultraviolet absorber is added, it is preferred to add 0.1 part by weight to 3 parts by weight of the ultraviolet absorber to 100 parts by weight of the light-transmitting resin. When it is in the above range, the ultraviolet ray absorbing agent can be prevented from oozing out to the surface, and the appearance of the light diffusing plate can be favorably maintained. The heat stabilizer is not particularly limited. Examples of the heat stabilizer include manganese 153171.doc • 14·201137406 compounds, copper compounds, and the like. When a heat stabilizer is added, it is preferably a *ultraviolet absorber-added 'with respect to t parts by weight of the ultraviolet absorber in the light-transmitting resin, and a heat stabilizer is added in a ratio of 2 parts by weight or less, relative to the light-transmitting resin The feed line in the middle absorbs #11 parts by weight, more preferably twentieth parts by weight to 1 part by weight of a heat stabilizer. Further, the "antioxidant" is not particularly limited, and examples thereof include a hindered phenol compound and a hindered amine compound. When the antioxidant is added, (iv) is an antioxidant in parts by weight based on 10 parts by weight of the light-transmitting resin. Further, in the light diffusing plate 1G, an antistatic agent may be mixed in the light transmitting resin as needed. The antistatic agent may be applied to the front surface 13 and/or the back surface u of the light diffusing plate 1G. Further, as shown in FIG. 5, the light diffusing plate 10 is in a position parallel to the linear light source 8 in the light box 7, and the semicircular convex portion 28 is parallel, and the back surface 11 of the light diffusing plate 1 is abutted against the side wall of the light box 7. 6, and fixed to the light box 7. Thereby, the open surface 9 of the light box 7 is plugged by the light diffusing plate 10. <Manufacturing Method of Light-Diffusing Plate (Laminated Resin Sheet)> The light-diffusing sheet 10 can be produced by cutting a laminated resin sheet produced by the following method. Fig. 6 is a schematic configuration diagram of a manufacturing apparatus used in a method of producing a resin sheet according to an embodiment of the present invention. Fig. 7 is a cross-sectional view showing the main part of the gravure transfer mold mounted on the upper roll. Fig. 8 is a cross-sectional view showing the main part of a rough transfer mold mounted on an intermediate roll. The sheet manufacturing apparatus 51 has a sheet forming machine 52 which extrudes a raw material resin in the form of a sheet 153171.doc 201137406; a group of extrusion roller sets 54 for extrusion by extrusion The laminated resin sheet 53 is molded; and a conveyance roller group 55 and a blower 56 for conveying the laminated resin sheet formed by the extrusion roller group 54. The sheet forming machine 52 has a first extruder 57 for heating and melting the raw material of the base material layer 26 (A), and a second extruder 5 8 for using the raw material resin of the back surface layer 27. (B) heating and melting; a feed block bl〇ck 59 which supplies a resin which is melted by the first and second extruders 57, 58; and a die 6 〇 which is used for extrusion in a sheet state The resin in the block 59. As the first and second extruders 57 and 58, a known extrusion molding machine can be used. Known extrusion molding machines are, for example, single-shaft extruders, twin-screw extruders, and the like. In the first and second extruders 57 and 58, hoppers 61 and 62 for introducing the resin into the cylinder of the extruder are attached. The feed block 59 is not particularly limited as long as it can supply two or more kinds of resins to the die 60 and is coextruded in a laminated state. As the feed block 59, a known feed block can be used. Known feed blocks are, for example, two 3-layer distribution types or two 2-layer distribution type feed blocks. The die 60 is not particularly limited as long as it is a die for coextrusion. As the die 6Q, a known die can be used. A known die is, for example, a multi-manifold die or the like. The pressing roller group 54 has three pressing rollers 63 to 65 which are formed by squeezing C on the one hand to form the laminated resin sheet 53 on the one hand, and on the upper surface 75 of the laminated resin sheet 53 by a transfer mold, 76 (the upper surface 76 is the back surface 11 of the light diffusion plate ,, and the lower surface 75 is the front surface 13 of the light diffusion plate 1). 153171.doc -16- 201137406 The three pressing rolls 63 to 65 each include a cylindrical metal (for example, made of stainless steel or steel) rolls. The three pressing rolls 63 to 65 are arranged such that the axes of the respective pressing rolls 63 to 65 are horizontal. Further, the three pressing rolls 63 to 65 are, in order from the top, the upper roll 63, the intermediate roll 64, and the lower roll 65, and are continuously arranged in the vertical direction so as to be parallel to each other. Motors (not shown) are connected to the rotating shafts of the pressing rolls 63 to 65, respectively. The upper roller 63 and the lower roller 65 are rotatable clockwise, and the intermediate roller 64 is rotatable counterclockwise. In other words, the squeezing rollers 63 to 65 are sequentially "rotatable clockwise", "reversible clockwise rotation", and "clockwise rotation". Thereby, it is possible to rotate in the same state in which all of the rolls 63 to 65 sandwich the laminated resin sheet 53. Therefore, on the one hand, the both surfaces 75 and 76 of the laminated resin sheet 53 extruded from the sheet forming machine 52 can be conveyed from the lower side to the upper side and sent to the conveyance roller group 55. The diameter of each of the pressing rolls 63 to 65 is, for example, 1 mm to 5 mm. Further, when a metal roll is used as the press rolls 63 to 65, the surface of each of the press rolls 63 to 65 may be subjected to a plating treatment such as chrome plating, copper plating, nickel plating, or Ni-P plating. On the peripheral surface 66 of the upper roll 63, a gravure transfer mold 67 for forming a semicircular convex portion 28 on the laminated resin sheet 53 is attached. In the gravure transfer mold 67, as shown in Fig. 7, a plurality of grooves 72 having opposite shapes to the cylindrical lens-shaped semicircular projections 28 are formed in stripes in the circumferential direction of the upper roll 63. That is, the concave surface of the groove 72 and the positive direction of the groove 72 in the longitudinal direction (circumferential direction) have a substantially semicircular shape. The depth H of the groove 72 is slightly larger than the height H of the semicircular projection 28 (for example, 3 μm to 45 μm μm). Further, the distance (pitch ρ) between the centers of the adjacent grooves 72 can be appropriately determined in accordance with the shape of the semicircular convex portion 28. The height Η of the semicircular convex portion 28 and the depth 153171.doc • 17 - 201137406 凹槽 of the groove 72 are caused by the transfer of the intaglio transfer mold 67 onto the laminated resin sheet 53 to form the semicircular convex portion 28. Transfer rate (H7H) (%). On the peripheral surface 68 of the intermediate roll 64, for example, a rough transfer mold 69 for forming fine irregularities 29 on the laminated resin sheet 53 is attached. In the rough transfer mold 69, as shown in Fig. 8, a plurality of embossed shapes are formed on the peripheral surface 中间 of the intermediate roll, and the embossed shapes include the shape and the fineness of the back surface 11 of the light diffusing plate 10. The fine unevenness 71 of the unevenness 29 is opposite. In other words, the surface of the rough surface transfer mold 69 has an embossed shape including fine irregularities 71, and a substantially uniform surface of the knives on the entire surface. The arithmetic mean roughness Ra of the surface of the slit transfer mold 69 is, for example, 6.0 μm to 8·0 μm, and the ten-point average roughness Rz of the surface of the rough transfer mold 69 is, for example, 45 〇μιη to 5 〇〇, heart The average interval Rsm of the surface of the surface transfer mold 69 is, for example, 12 〇μηι 〇 The raw materials of the rough transfer mold 69 and the intaglio transfer mold 67 are, for example, organic materials. The organic material may have heat resistance capable of maintaining the shape of the transfer mold even if the laminated resin sheet 53 which has just been extruded from the die 60 in a heated and molten state is repeatedly pressed. The organic material is, for example, a resin such as a thermosetting resin or a thermoplastic resin. The thermosetting resin is, for example, a phenol resin, an epoxy resin, a melamine resin, a urea resin, a polyimide resin (a resin), an unsaturated polyester resin, an alkyd resin or the like. The thermoplastic resin is, for example, a styrene resin, an acrylic resin, a polyethylene resin, a polypropylene resin, a cyclic olefin polymer resin, or an acrylonitrile - 153171.doc • 18 · 201137406 Ding-di-styrene resin (ABS resin) Polyethylene terephthalate resin (PET resin), polycarbonate resin (PC resin), polyether oxime resin (PES resin), thermoplastic polyimide resin (PI resin), and the like. Among them, a preferred one is a thermoplastic resin having a Vicat softening point (JIS K7206-1999 Λ50 method) higher than a Vicat softening point of a laminated resin sheet extruded from a die 6 〇, and crosslinked. The thermoplastic resin 》 The lower surface 70 of the lower light 65 is smoothed by, for example, mirror processing. Further, the 'chain transfer mold 69 may be attached to the upper roll 63, and the intaglio transfer mold 67 may be worn by the intermediate roll 64. In addition, the perimeter 64 of the middle pro 64 can be used by
施鏡面加工而成為平滑面。該情形下，光擴散板1〇之背面 11成為平滑面D 搬運用輥組55具有複數個搬運輥73，該等搬運輥73用於 將自上輥63剝離且送出之積層樹脂片53在上輥63之上端的 高度位置上支持並進行搬運。 複數個搬運輥73係在水平方向上彼此隔開間隙而配置， 設置合計5〜30個左右。各搬運輥73，例如，具有1〇〇 mm〜200 mm的直徑。各搬運輥73之周面，例如藉由實施鏡 面加工而成為平滑面。此外，各搬運輥73與擠壓輥63〜65 同樣地具有冷卻功能，由此，能夠自下表面75(前面13)側 對搬運之積層樹脂片53進行冷卻。 送風機56設置於擠壓用輥組54與搬運用輥組55之間。本 實施形態中，送風機56係設置於上輥63與最上游的搬運輥 73之間’且位於搬運的積層樹脂片53的下方。由此，能夠 在利用搬運輥73進行冷卻之前，自下表面75(前面13)側對 153171.doc -19- 201137406 刀等 自上輥63剝離之積層樹脂片53進行冷卻。料送風機％， 可以使用公知之送風機。公知之送風機例如為扇風機、氣 其次’對使用了上述製造裝置之積層樹脂片”的製造方 法進行說明。 (1) 片製造步驟 首先，將基材層26之原料樹脂（Α)投入至第丨擠出機”之 料斗61，熔融混煉後，供給至進料塊59。另一方面，將背 面層27之原料樹脂（Β)投入至第2擠出機58之料斗Q，熔融 混煉後，供給至進料塊59。第丨擠出機57及第2擠出機“之 氣缸溫度設定為例如190°C〜250°C。 其次，進料塊59内之樹脂係藉由自模頭6〇共擠出，而作 為包含下側之基材層26及上側之背面層27的2層積層樹脂 片53而連續地擠出。 (2) 轉印步驟 自模頭60擠出之積層樹脂片53係藉由利用擠壓輥63〜65 擠壓、冷卻而成型。 具體而言，自模頭60共擠出之樹脂由中間輥64與下輥65 夾著而擠壓後，上表面76(背面11)密著於中間輥64之周面 68而被搬運，此時使其冷卻。作為中間輥64與下輥65之表 面（設定）溫度，較佳為低於積層樹脂片53之擠出溫度。例 如’中間輕64設定為70C〜100C，下輥65設定為8〇°c〜 110°C。此外，中間輥64與下輥65之擠壓時，於積層樹脂 片53之上表面76(背面11)，轉印有中間輥64之糙面轉印模 153171.doc •20· 201137406 69之形狀，從而形成多個微細之凹凸29。 然後’利用上親63與中間輥64夾著積層樹脂片53進行擠 壓。作為上輥63之表面（設定）溫度’設定為例如 6〇°C〜9〇°C。此外，上輥63與中間輥64之擠壓時，凹版轉 印模67之表面形狀轉印於積層樹脂片53之下表面75(前面 13)，藉此，沿片之流動方向（送出方向）形成多個平行的條 紋狀之半圓凸部28。 然後，密著於上輥63而搬運之積層樹脂片53，於上輥63 之上端自周面66剝離，且在以上表面76(背面u)朝上方之 姿勢（下表面75朝下方之姿勢）而維持平坦性的狀態下沿 水平方向送出，且藉由搬運輥73以自下表面75側支持之姿 勢搬運。 搬運時，積層樹脂片53係於擠壓用輥組54與搬運用親組 55之間，藉由送風機56而受到送風冷卻，在搬運用輥組” 中藉由搬運輥73而受到接觸冷卻。送風機56之風力係適當 地相對地增減（例如，送弱風、+風、強風），作為搬㈣ 73之表面（設定）溫度，例如在牝力〜卯力之範圍内全部設 定為同一溫度。 然後，利用-對牽引輥（未圖示）牵引而製造積層樹脂片 53。然後，進一步將積層樹脂片„冷卻後，以適當之大小 切斷’從而能夠得到圖4所示之光擴散板1 〇。 (3)作用效果 如上所述，根據該液晶顯示裝置丨，在與液晶面板3之關 係中，光擴散板10向接近液晶面板3的方向上翹曲成為凸 153171.doc -21 - 201137406 狀。然而’光擴散板10之中央部12(最接近液晶面板之部 分）的魅曲量W抑制為〇. 1 mm〜6.0 mm。因此，能夠在光擴 散板10之中央部與液晶面板3之背面25之間設置5 mm~l〇 mm的距離D、其結果，能夠防止光擴散板1〇與液晶面板3 之接觸’因此能夠防止成為不均勻之圖像顯示的不良狀況 的產生。 另一方面，在與線狀光源8之關係中，光擴散板1〇向遠 離線狀光源8之方向翹曲成為凸狀。而且，光擴散板1〇之 龜曲量W亦確保為〇.1 mm〜6〇 mm。因此，與光擴散板1〇 向線狀光源8侧翹曲之情形（正翹曲）、或光擴散板1〇為平坦 之情形相比，能夠擴大光擴散板1〇與線狀光源8的距離 D(本貫施形態中’為〗3 丨6 mm)。其結果，能夠提高 線狀光源8之隱蔽性（燈隱蔽性）。 即，液晶顯示裝置1中，光擴散板1〇向接近液晶面板3之 方向具有凸狀的翹曲（反翹曲），而且，其中央部12之翹曲 量W為0.1 mm〜6.〇 mm，從而能夠兼顧防止產生成為不均 勻之圖像顯示的不良狀況、及提高光源隱蔽性。 此外，光擴散板10之中央部12與液晶面板3之背面25之 間設置有5 mm〜10 mm的距離D，，因此在光擴散板1〇與液 晶面板3之間確保有至少5 mm的間隔。因此，即使由於液 晶顯示裝置1使用時的線狀光源8的點燈、液晶顯示裝置i 長期運送時的周圍氣溫上升等，使得光擴散板1〇向液晶面 板3之翹曲量增加，亦可以防止光擴散板1〇與液晶面板3之 接觸。進而，由於在光擴散板10與液晶面板3之間確保有 153171.doc -22· 201137406 至V 5 mm的間隔，因而如圖1和圖2所示，能夠在光擴散板 1〇與液晶面板3之間設置光學膜4。其結果，不僅能夠防止 成為不均勻之圖像顯示的不良狀況的產生，而且能夠提高 液晶顯示裝置1之光學特性。 另一方面’光擴散板10與液晶面板3之間的間隔最大為 10 mm，因此能夠抑制具有液晶面板3、光擴散板1〇及線狀 光源8等之單.元尺寸的大型化（厚型化）。 而且’上述光擴散板10適合用於例如具有2〇型（444 mm><249 mm)〜65 型（1428 mmx804 mm)之燈箱 7 的尺寸（液 晶顯示裝置1之晝面尺寸）的液晶顯示裝置1中。 以上對本發明之一實施形態進行了說明，但本發明亦能 以其他實施形態實施。 例如’本發明之樹脂片並不限定於如光擴散板1〇之2層 樹脂板，亦可以為例如單層樹脂板、由3層以上之層組成 的樹脂板。 此外’光擴散板1 0之表面形狀並不限於如半圓四部2 8之 柱面透鏡形狀及如微細之凹凸29之糙面形狀（壓花整飾）， 為了提咼光擴散板10之光擴散性’可以加工為各種形狀。 此外’前面13與背面11之形狀可以相同，亦可以不同。 此外’例如，若是與對搬運或積層樹脂片53與擠壓輥 63〜65之密著進行輔助之轉印技術無關的轉，則可以設置 與積層樹脂片53及各轉印模（糙面轉印模69及凹版轉印模 67)相接的輥(；接觸輥）。 此外，上述背光系統2適合用作液晶顯示器用之面光源 153171.doc -23- 201137406 裝置，但並不特別限定於此種用途。 [實施例] 其次，基於實施例及比較例對本發明進行說明，但本發 明並不受下述實施例之限制。 <實施例及比較例> (實施例1) 1.積層樹脂片之製造裝置之構成 使用具有與圖6所示之樹脂片製造裝置51同樣之構成的 裝置。再有’作為裝置中安裝之拋光輥，準備以下之 (1)〜（3)之報。 (1) 上報 其係在周面設置有凹版轉印模之金屬製輥（直徑：45〇 mm)。即，於上輥之周面，沿圓周方向形成一周之剖面半 圓弧狀的多根凹槽相互平行地以條紋狀而形成。再有，使 相鄰之凹槽之間距P為280 μιη ’使凹槽之深度η為122 μιη。 (2) 中間輥 其係在周面設置有糙面轉印模之金屬製輥（直徑：45〇 mm)。即，中間輥之周面成為形成有多個微細之凹凸之糙 面。再有，使微細之凹凸之算術平均粗糙度 使十點平均粗糙度1^為46.6 μηι，使平均間隔Rsm為92.7 μηι 〇 (3) 下輥 其係周面進行有鏡面加工之金屬製親（直徑：45〇 mm)。 I53171.doc -24· 201137406 (4)搬運輥 。又置有26個周面進行了鏡面加工之金屬製輥(直徑：100 mm)(其中’自接近上輥之側起直至㈣個報具有冷卻功 能）。 2.具體之製造方法 利用氣缸内之溫度為19〇t〜25(rc之第丨擠出機，將苯乙 稀樹脂（東洋笨乙烯公司製造之「HRM40」，折射率為 1.59 ’吸水率為〇 2%)1〇〇質量份㈣混煉後，供給至2層分 配型進料塊。此外，利用氣缸内之溫度為19〇。(：〜250。(：之 第2擠出機，將苯乙烯樹脂（東洋苯乙烯公司製造之 「HRM40」，折射率為i 59，吸水率為〇 2%)⑽質量份溶 融混煉後，供給至上述2層分配型進料塊。 其次，在擠出樹脂溫度25(rc下藉由多歧管模頭（寬度： 1500 mm)將進料塊内的樹脂共擠出，以使自第丨擠出^供 給至進料塊之樹脂成為基材層（樹脂（A)層），且使自第2擠 出機供給至進料塊之樹脂成為背面層（樹脂（B)層）。然後， 利用上輥、中間輥及下輥進行拉伸、冷卻，藉此製作寬度 為1300 mm、總厚度為1.5 mm(基材層為145爪爪、背面層 為0.05 mm)之2層積層樹脂片。 於片之拉伸、冷卻過程中，分別調節各擠壓輥（直徑為 450 mm)之設定溫度（表面溫度），以使上輥為6〇t、中間 輥為75°C、下輥為97°C。 然後，藉由表面溫度同樣地設定為45t：之搬運親一方面 進行冷卻一方面進行搬運，利用牵弓丨輥進行牽引，從而獲 153171.doc -25- 201137406 得積層樹脂片。 再有’上報、中間親、下輥及搬運報之設定溫度係，— 方面隨時測定被牽引之積層樹脂片的翹曲量，一方面進行 適當調節以獲得下述表丨所示之翹曲量。此外，翹曲量係 藉由自製成之積層樹脂片中切出716 mmMW mm尺寸的 板，吊下該板，以使716 mm之邊成為水平，利用圖3所示 之方法進行測定而求出翹曲量。 (實施例2) 除了追加利用中型扇風機進行之冷卻工序以外，採用與 實施例1同樣之方法、條件製作積層樹脂片。具體而言， 於利用搬運輥對自上輥剝離之積層樹脂片進行搬運之前， 自其下表面側利用2台中型扇風機進行冷卻。 再有，上輥 '中間輥、下輥及搬運輥之設定溫度以及中 型扇風機之風力係，一方面隨時測定被牵引之積層樹脂片 之翹曲量，一方面進行適當調節以獲得下述表1所示之翹 曲量。 (比較例1) 除了將搬運輥之表面溫度設定為85〇c以外，採用與實施 例1同樣之方法、條件製作積層樹脂片。 再有，上輥、中間輥、下輥及搬運輥之設定溫度係，一 方面隨時測定被牽引之積層樹脂片&輕曲^，_方面適當 調節以獲得下述表1所示之翹曲量。 (比較例2) 除了追加利用大型扇風機及中型扇風機進行之冷卻工序 153171.doc -26- 201137406 以外，採用與實施例丨同樣之方法、條件製作積層樹脂 片。具體而言，於利用搬運輥對自上輥剝離之積層樹脂片 進行搬運之前，自其下表面側利用丨台大型扇風機及2台中 型扇風機進行冷卻。 再有，上輥、中間輥、下輥及搬運輥之設定溫度以及中 型扇風機及大型扇風機之風力係，一方面隨時測定被牽引 之積層樹脂片之翹曲量，一方面進行適當調節以獲得下述 表1所示之趣曲量。 <評估> 1. 試驗樣品（光擴散板）之製作 將上述實施例及比較例中製作之各積層樹脂片切割為 716 mmx414 rrnn之大小，藉此製作試驗樣品。對於所製作 之樣品’實施以下之2〜5之物性測定及評估。 2. 轉印率 利用超深度形狀測定顯微鏡（KEYENCE公司製造之 VK 8500」）觀察形成於各樣品之基材層（樹脂（a)層）側之 主面上的半圓凸部的剖面形狀，且測定半圓凸部之高度 Η。然後，求出半圓凸部之高度H，與上輥之周面上所形成 之凹槽之深度Η的比例，藉此算出半圓凸部之轉印率（= Η’/Ηχ1〇〇(%))β將算出結果示於下述表1中。 3. 背面層的表面粗趟度 (1)算術平均粗縫度Ra 依據JIS B0601-2001測定各樣品之背面層側之主面的算 術平均粗糙度Ra。具體而言，使用表面粗糙度計（Mitut〇y〇 153171.doc -27- 201137406 公司製造之「s:r-2〇1P」）敎積層樹脂板之縫面之算術平 均粗糙度Ra。再有，表面粗糙度計之測定條件係設定為臨 界值：0.8x1、測定範圍：自動。 (2) 十點平均粗糙度Rz 依據JIS B0601-2001測定各樣品之背面層側之主面的十 點平均粗糙度Rz«具體而言，使用表面粗糙度計（Mitut〇y〇 公司製造之「SJ-201P」）測定樣品之糙面之十點平均粗糙 度Rz。再有，表面粗糙度計之測定條件係設定為臨界值： 〇·8χ1、測定範圍：自動。 (3) 凹凸之平均間隔Rsm 依據JIS B0601-2001測定各樣品之背面層側之主面的凹 凸的平均間隔Rsm。具體而言，使用表面粗糙度計 (Mitutoyo公司製「SJ-201P」）測定樣品之糙面之凹凸的平 均間隔Rsm。再有’表面粗糙度計之測定條件係設定為臨 界值：0.8x1、測定範圍：自動。 將（1)〜(3)之測定結果示於下述表1中。 4.光源隱蔽性評估 將液晶電視（松下公司製造之「LC-32X2」）拆卸，將原 本設置之透光性樹脂片替換為各樣品，再次組裝，作為評 估用電視。該評估用電視具有以下之構成。 •線狀光源之數量：8根 •相鄰之線狀光源之中心之間的間隔L : 45 mm .光擴散板與線狀光源之中心的距離D: 15 mm •間隔L與距離D之比率（L/D) : 3.0 153171.doc -28 · 201137406 然後’將該評估用電視之背光（線狀.光源8根；)點燈。此 時’將圖案發生器（LEADER ELECTRONICS公司製造之 「NTSC圖案發生器LT436」）與電視連接，使液晶面板之 晝面進行白色顯示。然後’藉由確認是否能夠自正面看到 燈（線狀光源）之影像，來進行光源隱蔽性之評估。結果如 表1所示。表1中，「0」表示與觀察液晶面板之晝面之角 度無關，完全看不到燈影像，r X」表示自任何位置觀察液 晶面板之畫面均看到了燈影像。 5. 圖像顯示性能評估 組裝與「4_光源隱蔽性評估」中使用之評估電視之構 造相同的評估用電視。將該評估用電視於5〇〇c /8〇0/〇 環境下放置24小時。經過24小時後，於25°C/50°/D RH之暗 室環境下放置1小時後，將背光（線狀光源8根）點燈。然 後，自背光剛點燈後經過24小時為止，每隔i小時自正面 利用目視確認是否發生不均勻之圖像顯示，藉此進行圖像 顯示之評估。結果如表丨所示。表丨中，「〇」表示完全看不 到不均勻之圖像，「X」表示看到了不均勻之圖像。 6. 考察 如表1所示’於實施例1及2中，評估用樣品向接近液晶 面板之方向具有凸狀之麵曲（反麵曲），而且該輕曲量為 mm〜6·0 mm，因此能夠確認顯示不均勻之圖像的不良狀況 及光源隱蔽不足均沒有發生。 另一方面，於比較例1中，由於評估用樣品向接近線狀 光源側之方向具有凸狀之翹曲（正翹曲）^因此，樣品與線 153171.doc -29· 201137406 狀光源之距離縮短’能夠確認容易看到燈影像。此外，於 比較例2中’評估用樣品向接近液晶面板之方向具有凸狀 之翹曲（反翹曲）。然而，評估用樣品之翹曲量大大超過了 6.0 mm »因此，樣品與線狀光源接觸，能夠確認接觸之部 位之圖像奮亂。 [表1] 153171.doc •30· 201137406 圖像 顯示性能 〇 〇 〇 X 光源 隱蔽性 I 〇 O X 1 勉曲量 (mm) +3.0 +6.0 -3.0 +11.0 液晶電視之構造 L/D m m 距離D (mm) vn 間隔L (mm) 光源數 (根） 00 oo 00 00 背面層之表面粗糙度. Rsm (μπι) 226.0 (N (N 238.0 274.0 Rz (μηι) 22.3 23.7 22.8 ] 26.0 Ra (μπι) ΓΛ 〇 ¥ 卜 rn — 轉印率 (%) On 〇\ ON Ό 〇\ 總厚度（mm) 背面 (mm) i <T) 0.05 0.05 1.50 0.05 1.50 0.05 基材 (mm) 1.45 1.45 1.45 1.45 實施例1 實施例2 比較例1 比較例2 «壊w^鳑长啭(-)< « 塌w^ewf#^vstn5^«E长啭(+ )，碳写令3( + ;^#电瓌※ -31 · 153171.doc 201137406 【圖式簡單說明】 圖1係本發明之一實施形態之液晶顯示裝置之側面示意 圖。 圖2係本發明之一實施形態之液晶顯示裝置之立體示意 圖。 圖3係用於說明光擴散板之翹曲測定之方法的圖。 圖4係光擴散板之立體示意圖。 圖5係表示光擴散板（切割線V-V上之剖面）對於燈箱之安 裝狀態的燈箱之主要部分剖面圖。 圖6係本發明之一實施形態之樹脂片之製造方法中使用 的製造裝置之概略構成圖。 圖7係安裝於上輥之凹版轉印模之主要部分剖面圖。 圖8係安裝於中間輥之糙面轉印模之主要部分剖面圖。 【主要元件符號說明】 1 液晶顯示裝置 2 背光系統 3 液晶面板 4 光學膜 5 後壁 6 側壁 7 燈箱 8 線狀光源 9 開放面 10 光擴散板（樹脂片） 153171.doc •32· 201137406 11 光擴散板之背面 12 中央部（第2面之中央部） 13 光擴散板之前面 14 上端 15 下端 16 左端 17 右端 18 ' 19 線 20 交點 21 垂線 22 液晶早元 23、 24 偏振片 25 液晶面板之背面 26 基材層 27 背面層 28 半圓凸部 29 ' 71 微細之凹凸 51 片製造裝置 52 片成型機 53 積層樹脂片 54 擠壓用輥組 55 搬運用輥組 56 送風機 57 第1擠出機 153171.doc -33- 201137406 58 第2擠出機 59 進料塊 60 模頭 61 ' 62 料斗 63 、 64 、 65 擠壓輥 66 ' 68 ' 70 周面 67 凹版轉印模 69 糖面轉印模 72 凹槽 73 搬運輥 75 下表面 76 上表面 D、D， 距離 E、L 間隔 H' 尚度 H 深度 p、p' 間距 T 總厚度 tl、t2 厚度 W 魅曲量 -34· 153171.docThe mirror surface is processed to form a smooth surface. In this case, the rear surface 11 of the light-diffusing sheet 1 is a smooth surface D. The transport roller group 55 has a plurality of transport rollers 73 for separating the laminated resin sheet 53 which is peeled off from the upper roller 63 and sent out. The upper end of the roller 63 is supported and carried at a height position. The plurality of conveyance rollers 73 are disposed with a gap therebetween in the horizontal direction, and are provided in a total of about 5 to 30. Each of the conveyance rollers 73 has, for example, a diameter of 1 mm to 200 mm. The circumferential surface of each of the conveyance rollers 73 is smoothed by, for example, mirror processing. Further, each of the conveying rollers 73 has a cooling function similarly to the pressing rollers 63 to 65, whereby the laminated resin sheet 53 to be conveyed can be cooled from the lower surface 75 (front surface 13) side. The blower 56 is provided between the pressing roller group 54 and the conveying roller group 55. In the present embodiment, the blower 56 is disposed between the upper roller 63 and the most upstream conveyance roller 73, and is located below the conveyed laminated resin sheet 53. Thereby, the laminated resin sheet 53 peeled off from the upper roll 63, such as a 153171.doc -19-201137406 knife, can be cooled from the lower surface 75 (front 13) side before cooling by the conveyance roller 73. For the blower %, a known blower can be used. A known method of producing a blower, for example, a fan and a gas, is described below. (1) Sheet manufacturing step First, the raw material resin (base material) of the base material layer 26 is put into the third stage. The hopper 61 of the extruder is melt-kneaded and then supplied to the feed block 59. On the other hand, the raw material resin (Β) of the backing layer 27 is introduced into the hopper Q of the second extruder 58, and is melted and kneaded, and then supplied to the feed block 59. The cylinder temperature of the second extruder 57 and the second extruder is set to, for example, 190 ° C to 250 ° C. Next, the resin in the feed block 59 is coextruded from the die 6 to serve as The two-layered resin sheet 53 including the lower base material layer 26 and the upper back surface layer 27 is continuously extruded. (2) Transfer step The laminated resin sheet 53 extruded from the die 60 is extruded by using The rollers 63 to 65 are formed by extrusion and cooling. Specifically, the resin coextruded from the die 60 is pressed by the intermediate roller 64 and the lower roller 65, and the upper surface 76 (back surface 11) is adhered to the middle. The peripheral surface 68 of the roller 64 is conveyed and cooled at this time. The surface (set) temperature of the intermediate roller 64 and the lower roller 65 is preferably lower than the extrusion temperature of the laminated resin sheet 53. For example, the intermediate light 64 The setting is 70C to 100C, and the lower roller 65 is set to 8 〇 ° c to 110 ° C. Further, when the intermediate roller 64 and the lower roller 65 are pressed, the upper surface 76 (back surface 11) of the laminated resin sheet 53 is transferred. The shape of the rough transfer mold 153171.doc •20·201137406 69 of the intermediate roller 64 is formed to form a plurality of fine irregularities 29. Then, the upper parent 63 and the intermediate roller 64 are sandwiched. The layer resin sheet 53 is pressed. The surface (set) temperature ' as the upper roll 63 is set to, for example, 6 ° C to 9 ° C. Further, when the upper roll 63 and the intermediate roll 64 are pressed, the gravure transfer mold The surface shape of 67 is transferred to the lower surface 75 (front surface 13) of the laminated resin sheet 53, whereby a plurality of parallel strip-shaped semicircular projections 28 are formed in the flow direction (feeding direction) of the sheet. The laminated resin sheet 53 conveyed by the upper roll 63 is peeled off from the peripheral surface 66 at the upper end of the upper roll 63, and maintains flatness in a posture in which the upper surface 76 (back surface u) faces upward (the lower surface 75 faces downward). In the state of being conveyed in the horizontal direction, the conveyance roller 73 is conveyed in a posture supported from the lower surface 75 side. During conveyance, the laminated resin sheet 53 is placed between the extrusion roller group 54 and the conveyance group 55 by The blower 56 is cooled by air blowing, and is brought into contact cooling by the conveyance roller 73 in the conveyance roller group. The wind power of the blower 56 is appropriately increased or decreased relatively (for example, sending weak wind, + wind, strong wind), and the surface (set) temperature of the moving (four) 73 is set to the same temperature, for example, within the range of force to force. . Then, the laminated resin sheet 53 is produced by pulling with a pulling roll (not shown). Then, the laminated resin sheet is further cooled and then cut to an appropriate size to obtain the light diffusing plate 1 shown in Fig. 4. (3) The effect is as described above, according to the liquid crystal display device In the relationship of the liquid crystal panel 3, the light diffusing plate 10 is warped in a direction close to the liquid crystal panel 3 to be convex 153171.doc -21 - 201137406. However, the central portion 12 of the light diffusing plate 10 (the portion closest to the liquid crystal panel) The enchantment amount W is suppressed to 〇1 mm to 6.0 mm. Therefore, a distance D of 5 mm to 10 mm can be provided between the central portion of the light diffusing plate 10 and the back surface 25 of the liquid crystal panel 3, and as a result, The contact between the light diffusing plate 1 and the liquid crystal panel 3 is prevented. Therefore, it is possible to prevent the occurrence of a problem of uneven image display. On the other hand, in the relationship with the linear light source 8, the light diffusing plate 1 is far away. The direction of the off-line light source 8 is warped to be convex. Moreover, the tortuosity W of the light diffusing plate 1 is also ensured to be 11 mm to 6 mm. Therefore, the light diffusing plate 1 is aligned with the linear light source 8 side. The case of warpage (positive warpage), or the light diffusing plate 1 is flat In contrast, the distance D between the light diffusing plate 1 and the linear light source 8 can be increased (in the present embodiment, 'is 3 丨 6 mm). As a result, the concealability of the linear light source 8 can be improved (lamp concealability) In the liquid crystal display device 1, the light diffusing plate 1 has a convex warp (anti-warpage) in the direction toward the liquid crystal panel 3, and the warpage amount W of the central portion 12 is 0.1 mm to 6 〇mm, it is possible to prevent both the occurrence of uneven image display and the improvement of the light source concealability. Further, between the central portion 12 of the light diffusing plate 10 and the back surface 25 of the liquid crystal panel 3, 5 mm is provided. With a distance D of 10 mm, an interval of at least 5 mm is ensured between the light diffusing plate 1A and the liquid crystal panel 3. Therefore, even when the liquid crystal display device 1 is used, the linear light source 8 is turned on, and the liquid crystal display device is used. i The temperature rise of the ambient light during long-term transportation increases the amount of warpage of the light diffusing plate 1 to the liquid crystal panel 3, and also prevents the light diffusing plate 1〇 from coming into contact with the liquid crystal panel 3. Further, due to the light diffusing plate 10 and 153171.doc -22· 2011 is guaranteed between the LCD panel 3 With an interval of 37406 to V 5 mm, as shown in FIGS. 1 and 2, the optical film 4 can be disposed between the light diffusing plate 1A and the liquid crystal panel 3. As a result, it is possible to prevent not only uneven image display. In addition, the optical characteristics of the liquid crystal display device 1 can be improved, and the distance between the light diffusing plate 10 and the liquid crystal panel 3 is at most 10 mm. Therefore, it is possible to suppress the liquid crystal panel 3 and the light diffusing plate 1 . Further, the linear light source 8 and the like have a large size (thickness). Further, the above light diffusing plate 10 is suitable for, for example, a type 2 (444 mm < 249 mm) to 65 (1428 mm x 804). The size of the light box 7 of mm (the size of the face of the liquid crystal display device 1) is in the liquid crystal display device 1. Although an embodiment of the present invention has been described above, the present invention can be embodied in other embodiments. For example, the resin sheet of the present invention is not limited to a two-layer resin sheet such as a light-diffusing sheet 1a, and may be, for example, a single-layer resin sheet or a resin sheet composed of three or more layers. Further, the surface shape of the light diffusing plate 10 is not limited to a cylindrical lens shape such as a semicircle and a cylindrical shape, and a rough surface shape such as a fine unevenness 29 (embossing), in order to enhance the light diffusion of the light diffusing plate 10. Sex can be processed into a variety of shapes. Further, the shapes of the front face 13 and the back face 11 may be the same or different. In addition, for example, if it is a transfer which is independent of the transfer technique for assisting the adhesion of the conveyed or laminated resin sheet 53 and the pressing rolls 63 to 65, the laminated resin sheet 53 and the respective transfer molds (rough surface turn) may be provided. A stamp (contact roll) in which the stamp 69 and the intaglio transfer mold 67 are joined. Further, the backlight system 2 described above is suitably used as a surface light source for liquid crystal displays 153171.doc -23-201137406, but is not particularly limited to such use. [Examples] Next, the present invention will be described based on examples and comparative examples, but the present invention is not limited by the following examples. <Examples and Comparative Examples> (Example 1) 1. Configuration of a manufacturing apparatus of a laminated resin sheet A device having the same configuration as that of the resin sheet manufacturing apparatus 51 shown in Fig. 6 was used. Further, as the polishing roller mounted in the apparatus, the following reports (1) to (3) are prepared. (1) Reported A metal roller (diameter: 45 mm) provided with a gravure transfer mold on the circumference. That is, on the circumferential surface of the upper roll, a plurality of grooves having a semicircular arc shape which is formed in one circumferential direction in the circumferential direction are formed in stripes in parallel with each other. Further, the distance P between adjacent grooves is 280 μm, and the depth η of the groove is 122 μm. (2) Intermediate roll A metal roll (diameter: 45 mm) provided with a rough transfer mold on the circumferential surface. That is, the peripheral surface of the intermediate roll is a rough surface on which a plurality of fine irregularities are formed. Further, the arithmetic mean roughness of the fine concavities and convexities is such that the ten-point average roughness is 46.6 μηι, and the average interval Rsm is 92.7 μηι 〇 (3) The circumferential surface of the lower roll is subjected to mirror-finished metal pro ( Diameter: 45〇mm). I53171.doc -24· 201137406 (4) Handling roller. Further, 26 metal rolls (diameter: 100 mm) which were mirror-finished were placed (where 'from the side close to the upper roll until (four) reported cooling function). 2. The specific manufacturing method utilizes a temperature in the cylinder of 19 〇t to 25 (rc 丨 extruder, styrene resin ("HRM40" manufactured by Toyo Styrene Co., Ltd., refractive index of 1.59"). 〇 2%) 1 〇〇 parts by mass (4) After mixing, it is supplied to a 2-layer distribution type feed block. In addition, the temperature in the cylinder is 19 〇. (: ~250. (: 2nd extruder, will Styrene resin ("HRM40" manufactured by Toyo Styrene Co., Ltd., refractive index i 59, water absorption ratio 〇2%) (10) parts by mass after melt-kneading, and then supplied to the above-mentioned two-layer distribution type feed block. Resin the resin in the feed block by a multi-manifold die (width: 1500 mm) at a resin temperature of 25 (r), so that the resin supplied from the second crucible to the feed block becomes a substrate layer. (Resin (A) layer), and the resin supplied from the second extruder to the feed block becomes a back layer (resin (B) layer). Then, the upper roll, the intermediate roll, and the lower roll are used for stretching and cooling. Thus, a two-layer laminated resin sheet having a width of 1300 mm and a total thickness of 1.5 mm (the base layer is 145 claws and the back layer is 0.05 mm) is produced. During the stretching and cooling process, the set temperatures (surface temperatures) of the respective squeeze rolls (450 mm in diameter) were adjusted so that the upper roll was 6 〇t, the intermediate roll was 75 ° C, and the lower roll was 97 ° C. Then, by setting the surface temperature to 45t in the same manner, the conveyance is carried out on the one hand, and the conveyance is carried out on the one hand, and the traction is carried out by the raking roller, thereby obtaining a laminated resin sheet of 153171.doc -25-201137406. The set temperature of the report, the middle parent, the lower roll, and the conveyance report are used to measure the amount of warpage of the laminated resin sheet being pulled at any time, and on the other hand, it is appropriately adjusted to obtain the amount of warpage shown in the following table. The amount of warpage was obtained by cutting out a 716 mm MW mm-sized plate from the fabricated resin sheet, and hoisting the plate so that the 716 mm side was horizontal, and the measurement was performed by the method shown in FIG. (Example 2) A laminated resin sheet was produced in the same manner and in the same manner as in Example 1 except that the cooling process was carried out by using a medium-sized fan. Specifically, the laminate was peeled off from the upper roll by a conveyance roller. Resin sheet for moving Previously, two medium-sized fan fans were used for cooling from the lower surface side. Further, the set temperature of the upper roll 'intermediate roll, the lower roll and the transfer roll, and the wind speed of the medium-sized fan, on the one hand, measured the laminated resin sheet being pulled at any time. On the one hand, the amount of warpage was appropriately adjusted to obtain the amount of warpage shown in the following Table 1. (Comparative Example 1) The same method as in Example 1 was carried out except that the surface temperature of the conveyance roller was set to 85 〇c. The laminated resin sheet is produced under the conditions. Further, the set temperatures of the upper roll, the intermediate roll, the lower roll, and the transfer roll are measured on the one hand, and the laminated resin sheet & The amount of warpage shown in 1. (Comparative Example 2) A laminated resin sheet was produced in the same manner and under the same conditions as in Example 153 except that a cooling process 153171.doc -26-201137406 was carried out by using a large fan and a medium fan. Specifically, before the laminated resin sheet peeled off from the upper roll is conveyed by the conveyance roller, it is cooled by the large fan fan and the two intermediate fan fans from the lower surface side. Further, the set temperatures of the upper roll, the intermediate roll, the lower roll, and the transfer roll, and the wind system of the medium fan and the large fan are used to measure the amount of warpage of the laminated resin sheet being pulled at any time, and on the one hand, appropriately adjust to obtain the next The amount of fun shown in Table 1. <Evaluation> 1. Preparation of test sample (light-diffusing sheet) Each of the laminated resin sheets produced in the above Examples and Comparative Examples was cut into a size of 716 mm x 414 rrnn to prepare a test sample. For the sample produced, the following physical properties of 2 to 5 were measured and evaluated. 2. Transfer rate The cross-sectional shape of the semicircular convex portion formed on the main surface of the base material layer (resin (a) layer) side of each sample was observed by an ultra-depth shape measuring microscope (VK 8500 manufactured by KEYENCE Co., Ltd.), and The height Η of the semicircular convex portion was measured. Then, the ratio of the height H of the semicircular convex portion to the depth Η of the groove formed on the circumferential surface of the upper roll is obtained, thereby calculating the transfer rate of the semicircular convex portion (= Η'/Ηχ1〇〇 (%) The results of β are shown in Table 1 below. 3. Surface roughness of the back layer (1) Arithmetic average rough degree Ra The arithmetic mean roughness Ra of the main surface of the back layer side of each sample was measured in accordance with JIS B0601-2001. Specifically, the arithmetic mean roughness Ra of the seam surface of the resin layer of the resin layer was measured using a surface roughness meter ("s:r-2〇1P" manufactured by Mitut 〇 〇 153171.doc -27-201137406). Further, the measurement conditions of the surface roughness meter were set to a critical value: 0.8x1, measurement range: automatic. (2) Ten-point average roughness Rz The ten-point average roughness Rz of the main surface of the back layer side of each sample was measured in accordance with JIS B0601-2001. Specifically, a surface roughness meter (manufactured by Mitut〇y Co., Ltd.) was used. SJ-201P") The ten point average roughness Rz of the matte side of the sample was measured. Further, the measurement conditions of the surface roughness meter are set to critical values: 〇·8χ1, measurement range: automatic. (3) Average interval Rsm of the concavities and convexities The average interval Rsm of the concavities and convexities of the main faces on the back layer side of each sample was measured in accordance with JIS B0601-2001. Specifically, the average interval Rsm of the unevenness of the rough surface of the sample was measured using a surface roughness meter ("SJ-201P" manufactured by Mitutoyo Co., Ltd.). Further, the measurement conditions of the 'surface roughness meter' were set to a critical value: 0.8x1, and the measurement range was automatic. The measurement results of (1) to (3) are shown in Table 1 below. 4. Evaluation of the light source concealing The LCD TV ("LC-32X2" manufactured by Matsushita Co., Ltd.) was disassembled, and the original translucent resin sheet was replaced with each sample and assembled again as a television for evaluation. This evaluation television has the following constitution. • Number of linear light sources: 8 • Interval between the centers of adjacent linear light sources L: 45 mm. Distance between the light diffusing plate and the center of the linear light source D: 15 mm • Ratio of interval L to distance D (L/D) : 3.0 153171.doc -28 · 201137406 Then 'the evaluation is lit up with the backlight of the TV (line. Light source 8;). At this time, the pattern generator ("NTSC pattern generator LT436" manufactured by LEADER ELECTRONICS) was connected to the television to display the white surface of the liquid crystal panel in white. Then, the evaluation of the concealability of the light source is performed by confirming whether or not the image of the lamp (linear light source) can be seen from the front. The results are shown in Table 1. In Table 1, "0" indicates that the lamp image is not visible at all, regardless of the angle of the face of the liquid crystal panel, and r X" indicates that the lamp image is seen from the position of the liquid crystal panel from any position. 5. Image display performance evaluation The same evaluation TV is assembled as the evaluation TV used in "4_Light Source Concealment Evaluation". The evaluation was placed in a 5 〇〇c / 8 〇 0 / 〇 environment for 24 hours. After 24 hours, after standing for 1 hour in a dark room environment of 25 ° C / 50 ° / D RH, the backlight (8 linear light sources) was turned on. Then, 24 hours from the time when the backlight was just turned on, the image display was evaluated by visually checking whether or not uneven image display occurred from the front side every hour. The results are shown in the table. In the table, "〇" means that no uneven image is visible at all, and "X" means that an uneven image is seen. 6. As shown in Table 1, in the first and second embodiments, the sample for evaluation has a convex curved surface (reverse curved surface) in the direction close to the liquid crystal panel, and the light curvature is mm 〜6·0 mm. Therefore, it can be confirmed that the defect of the image showing unevenness and the insufficient concealment of the light source do not occur. On the other hand, in Comparative Example 1, since the sample for evaluation has a convex warp (positive warpage) in the direction toward the side of the linear light source, the distance between the sample and the line 153171.doc -29·201137406 Shorten 'can confirm that the light image is easy to see. Further, in Comparative Example 2, the sample for evaluation had a convex warp (anti-warpage) in the direction toward the liquid crystal panel. However, the amount of warpage of the sample for evaluation greatly exceeded 6.0 mm » Therefore, the sample was in contact with the linear light source, and it was confirmed that the image of the contact portion was disturbed. [Table 1] 153171.doc •30· 201137406 Image display performance 〇〇〇X Source concealability I 〇OX 1 勉曲量 (mm) +3.0 +6.0 -3.0 +11.0 LCD TV construction L/D mm Distance D (mm) vn interval L (mm) number of light sources (root) 00 oo 00 00 surface roughness of the back layer. Rsm (μπι) 226.0 (N (N 238.0 274.0 Rz (μηι) 22.3 23.7 22.8 ] 26.0 Ra (μπι) ΓΛ 〇¥ 卜 — Transfer rate (%) On 〇\ ON Ό 〇\ total thickness (mm) back (mm) i <T) 0.05 0.05 1.50 0.05 1.50 0.05 substrate (mm) 1.45 1.45 1.45 1.45 Example 1 Example 2 Comparative Example 1 Comparative Example 2 «壊w^鳑长啭(-)< « Collapse w^ewf#^vstn5^«E 长啭(+), carbon write order 3( + ;^#电瓌※ 1 is a schematic side view of a liquid crystal display device according to an embodiment of the present invention. Fig. 2 is a perspective view showing a liquid crystal display device according to an embodiment of the present invention. Fig. 4 is a perspective view showing a method of measuring warpage of a light diffusing plate. Fig. 5 is a perspective view showing a light diffusing plate (cutting line VV) Fig. 6 is a schematic cross-sectional view showing a manufacturing apparatus used in a method of manufacturing a resin sheet according to an embodiment of the present invention. Fig. 7 is a schematic view of a manufacturing apparatus used in a method of manufacturing a resin sheet according to an embodiment of the present invention. Fig. 8 is a cross-sectional view showing the main part of the rough transfer mold mounted on the intermediate roll. [Main element symbol description] 1 Liquid crystal display device 2 Backlight system 3 Liquid crystal panel 4 Optical film 5 Wall 6 Side wall 7 Light box 8 Linear light source 9 Open surface 10 Light diffusing plate (resin sheet) 153171.doc •32· 201137406 11 Back side of light diffusing plate 12 Center part (center part of second surface) 13 Front side of light diffusing plate 14 Upper end 15 Lower end 16 Left end 17 Right end 18 ' 19 Line 20 Intersection point 21 Vertical line 22 Liquid crystal early 23, 24 Polarizer 25 Back side of liquid crystal panel 26 Substrate layer 27 Back layer 28 Semicircular projection 29 ' 71 Fine bump 51 Sheet manufacturing Device 52 sheet forming machine 53 laminated resin sheet 54 pressing roller group 55 conveying roller group 56 blower 57 first extruder 1531 71.doc -33- 201137406 58 2nd extruder 59 Feed block 60 Die 61 ' 62 Hopper 63, 64, 65 Squeeze roller 66 ' 68 ' 70 Peripheral surface 67 Gravure transfer mold 69 Sugar transfer mold 72 Groove 73 Transport roller 75 Lower surface 76 Upper surface D, D, Distance E, L Interval H' Shang H H depth p, p' Spacing T Total thickness tl, t2 Thickness W Charm volume -34· 153171.doc