201249914 六、發明說明： 【發明所屬之技術領域】 本發明係關於適合用來調製黃色度被充分抑制，且光 的射出效率優異的導光板之導光板用樹脂組成物。 【先前技術】 作爲液晶顯不裝置或照明裝置等的背光，例如，習知 之背光是在導光板的側方配置冷陰極管或led等光源， 以使來自光源的光反射至導光板背面被形成之點陣圖案（ dot pattern )或稜鏡部（prism )等，從導光板前面讓光能 夠均一地射出之方式構成。 作爲背光用之導光板，習知是在壓克力系樹脂（acryl )等的透明樹脂中使微粒子分散之導光板。透明樹脂中使 微粒子分散之導光板，透過光容易帶有黃色味（亦即，黃 度指數數値大；yellow index(YI))，而採用此類之導光板 之液晶顯示裝置，影像就稍微帶著黃色味，無法得到高品 質的影像。 作爲抑制透過光的黃色味之導光板，專利文獻1係揭 示一種導光板，讓透明樹脂的折射率及微粒子的折射率兩 者差的絕對値、與微粒子的累積50%粒子徑，雙方之積滿 足特定的範圍。 但是，該專利文獻1之導光板，有黃色度不被充分抑 制之場合，而且，有光的射出效率並不充足之場合。 201249914 [先前技術文獻] [專利文獻] [專利文獻1]日本專利特開20 1 0 — 92755 ξ 【發明內容】 [發明所欲解決之課題] 本發明之目的在於提供一種適合用來製 分抑制，且光的射出效率優異的導光板之導另 成物。 [用以解決課題之手段] 本發明之導光板用樹脂組成物，係具有以 (1)—種導光板用樹脂組成物，含有透 酮樹脂（silicone resin)微粒子之導光板用棱 其特徵係將前述樹脂組成物作成成形體時 200mm下被測定之波長領域300nm〜800nm^ 過率，爲25〜85%。 (2 )如（1 )記載之導光板用樹脂組成核 述矽酮樹脂微粒子，相對於前述樹脂組成物纪 含有比例在0.1〜200ppme (3 )如（1 )或（2 )記載之導光板用樹 其中，前述透明樹脂爲甲基丙烯酸樹脂（ resin )。 (4 )—種導光板，其特徵係由（1 )〜 公報 黃色度被充 板用樹脂組 下之構成。 明樹脂與矽 脂組成物， ，在光路長 I平均光線透 ，其中，前 總重量，被 脂組成物， methacrylic (3 )任一項 -6 - 201249914 記載之導光板用樹脂組成物所構成之導光板。 (5) 如（4)記載之導光板，其中，係在具備LED 光源之液晶顯示裝置所使用。 (6) —種面光源裝置，其特徵爲具備（4)或（5) 記載之導光板。 (7 ) —種液晶顯示裝置，其特徵係（6 )記載之面光 源裝置是被配置在液晶面板之背面側。 [發明之效果] 根據本發明，係能夠提供一種適合用來製作黃色度被 充分抑制，且光的射出效率優異的導光板之導光板用樹脂 組成物。 【實施方式】 <導光板用樹脂組成物> 本發明之導光板用樹脂組成物（以下，有簡單記載爲 「樹脂組成物」之場合），係含有透明樹脂與矽酮樹脂（ s i 1 i c ο n e r e s i η )微粒子，將前述樹脂組成物作成成形體時 ，在光路長200mm下被測定之波長領域300 nm〜80〇nm的 平均光線透過率爲2 5〜8 5 %。[Brief Description of the Invention] [Technical Field] The present invention relates to a resin composition for a light guide plate which is suitable for use in a light guide plate which is suitable for modulating yellowness and is excellent in light emission efficiency. [Prior Art] As a backlight of a liquid crystal display device or a lighting device, for example, a conventional backlight is provided with a light source such as a cold cathode tube or a led light on the side of the light guide plate to reflect light from the light source to the back surface of the light guide plate. A dot pattern or a prism or the like is formed so that light can be uniformly emitted from the front surface of the light guide plate. As a light guide plate for backlights, a light guide plate in which fine particles are dispersed in a transparent resin such as acryl resin is known. The light guide plate in which the fine particles are dispersed in the transparent resin is easily yellowish-transmissive (that is, the yellow index (YI)), and the liquid crystal display device using such a light guide plate has a slight image. With a yellow smell, you can't get high quality images. Patent Document 1 discloses a light guide plate that suppresses the difference between the refractive index of the transparent resin and the refractive index of the fine particles and the cumulative particle diameter of the fine particles by 50%. Meet a specific range. However, the light guide plate of Patent Document 1 has a case where the yellowness is not sufficiently suppressed, and there is a case where the light emission efficiency is insufficient. [Patent Document 1] [Patent Document 1] Japanese Patent Laid-Open No. 20 1 0 - 92755 ξ [Disclosure] [Problems to be Solved by the Invention] An object of the present invention is to provide a suitable suppression for division And the light guide plate with excellent light emission efficiency is a guide material. [Means for Solving the Problem] The resin composition for a light guide plate of the present invention has a resin composition for a light guide plate of (1), and a rib for a light guide plate containing fine particles of a silicone resin. When the resin composition is formed into a molded body, the wavelength range of 300 nm to 800 nm measured at 200 mm is 25 to 85%. (2) The light guide plate according to (1) is characterized in that the fluorenone resin fine particles are used, and the resin composition is contained in a ratio of 0.1 to 200 ppme (3) as in the light guide plate according to (1) or (2). In the tree, the aforementioned transparent resin is a methacrylic resin. (4) A type of light guide plate, which is characterized by (1) to a yellow resin-filled resin group. The resin and the resin composition, the average light transmittance in the optical path length I, wherein the front total weight, the fat composition, the methacrylic (3) any one of the resin compositions of the light guide plate described in -6 - 201249914 Light guide plate. (5) The light guide plate according to (4), which is used in a liquid crystal display device including an LED light source. (6) A seed surface light source device comprising the light guide plate according to (4) or (5). (7) A liquid crystal display device characterized in that the surface light source device described in (6) is disposed on the back side of the liquid crystal panel. [Effects of the Invention] According to the present invention, it is possible to provide a resin composition for a light guide plate which is suitable for use in a light guide plate which is sufficiently suppressed in yellowness and excellent in light emission efficiency. [Embodiment] <Resin composition for light guide plate> The resin composition for a light guide plate of the present invention (hereinafter, simply referred to as "resin composition") contains a transparent resin and an anthrone resin (si 1) The ic ο neresi η ) fine particles, when the resin composition is formed into a molded body, the average light transmittance of the wavelength range of 300 nm to 80 〇 nm measured in an optical path length of 200 mm is 2 5 to 8 5 %.
本發明之樹脂組成物所含有的透明樹脂，只要是透明 的，並不特別限定組成 '重量平均分子量等。例如，可舉 出甲基丙烯酸樹脂（聚甲基異丁烯酸酯（PMMA )等）、 聚碳酸酯樹脂、丙烯腈丁二烯苯乙烯共聚合物樹脂（ABS 201249914 樹脂）、聚苯乙烯樹脂、丙烯腈苯乙烯共聚合物樹脂（AS 樹脂）、聚烯烴樹脂（聚乙烯、聚丙烯等）等》該等之中 ，以甲基丙烯酸樹脂（methacrylic resin)較佳。 本發明的樹脂組成物所含有之矽酮樹脂微粒子，係供 使透過導光板之光擴散之用。 矽酮樹脂微粒子，平均粒徑、重量平均分子量等並未 特別受限定。爲了更有效率地讓光擴散，矽酮樹脂微粒子 ，最好具有平均粒徑在1〜12#!«以上，具有平均粒徑在 2〜6 y m更佳。 矽酮樹脂微粒子，相對於樹脂組成物之總重量，含有 比例在 0.1〜200ppm爲佳，在 1〜90ppm較佳，在 1〜 50ppm更佳，而含有比例在1〜lOppm特佳。 本發明之樹脂組成物，在作成成形體時在光路長 200mm下被測定之波長領域300nm〜800nm之平均光線透 過率爲25〜85%，在40〜70%較佳，藉此能夠抑制所得到 之導光板的黃色度且謀求高亮度化。 <導光板> 本發明之導光板，係由上述樹脂組成物所構成。具體 而言，本發明之導光板，例如，是將上述樹脂組成物利用 押出成形法、射出成形法、熱壓成形法等加以成形而得到 〇 在前述導光板，也可以添加例如紫外線吸收劑、熱安 定劑、防氧化劑、耐天候劑、光安定劑、螢光增白劑、加 201249914 工安定劑等各種添加劑。 導光板的厚度，並未受特別限定，通常爲〇.〇5〜 15mm，以0.1〜10mm較佳，以0.5〜5mm更佳。 <面光源裝置以及液晶顯示裝置> 其次，在圖1顯示採用本發明樹脂組成物所構成的導 光板之面光源裝置及採用此之液晶顯示裝置之一實施型態 〇 該液晶顯示裝置1，係具備面光源裝置9與液晶面板 3 〇，而面光源裝置9是被配置在液晶面板3 0的背面側。 液晶面板3 0，係具備在相互離間開而平行狀被配置之 上下一對透明電極1 2、1 3之間液晶1 1被封入之液晶胞20 ，與被配置在液晶胞2 0上下兩側之偏光板1 4、1 5。利用 該等之液晶1 1、透明電極1 2、1 3，及偏光板1 4、1 5而構 成影像顯示部。又，在透明電極12、1 3之內面（液晶側 的面）分別被層積著配向膜（未圖示）。 面光源裝置9，係被配置在上述偏光板1 5的下面側（ 背面側）。該面光源裝置9，係具備平面看來矩形狀且上 面側（前面側）被開放之薄箱型形狀燈箱5、在燈箱5內 被收納之導光板3及光源2、與以對燈箱5阻塞其開放面 之方式被配置並固定之光擴散板4。光源2，係例如LED (發光二極體）光源等，被配置在導光板3的側方位置。 燈箱5，係由白色的壓克力系樹脂板所構成。在導光 板3的背面3 a，係被形成白色墨的點陣印刷部（點陣圖形 -9- 201249914 ；dot pattern)，構成藉由光源2到導光板3內從其一側 面射入的光利用點陣印刷部反射，讓光從導光板3的前面 (亦即’光射出面3 b )得以均一地射出。 又，所使用的導光板3，例如，可以是如圖2所示方 式先讓周側面51被硏磨處理，也可以是先在光射出面3b 施以光均一化用的光擴散處理。此外，也可以在導光板3 的背面3 a，取代採用白色墨等之點陣印刷，而施以形成稜 鏡（prism )等之光擴散處理，或者，也可以在導光板的 光射出面3b以外的面，設置銀蒸鍍之薄膜或薄片等的光 反射層。 藉由該方式構成，本發明之液晶顯示裝置1，因爲可 以從面光源裝置9讓實質地不帶有黃色味之白色度較高的 光高亮度地向液晶面板3 0被射出，所以，能夠正確地再 現液晶面板3 0的色彩。從而，能夠實現不會帶有黃色味 、自然且高品質的明亮的色彩顯示。 圖1所示之液晶顯示裝置1，係採用導光板3的4個 側面之中’在一側面側配置光源2之構成，但並不特別限 定於此類之構成。例如，也可以採用在導光板3之相對向 的一對側面，分別配置光源2之構成。 又’作爲光源2，並不受特別限定，可以舉例例如冷 陰極管、熱陰極管、外部電極螢光燈（EEFL )等之線狀光 源、或發光二極體（LED )等之點狀光源等。 根據本發明，係能夠提供一種適合用來製作黃色度被 充分抑制’且光的射出效率優異的導光板之導光板用樹脂 -10- 201249914 組成物。從而’本發明，係在液晶顯示裝置等的領域很有 用。本發明之導光板，特別適於使用在電視之類的大畫面 的具備LED光源之液晶顯示裝置。 [實施例] 以下，舉出實施例及比較例具體說明本發明，但本發 明並不受限定於該等之實施例。 (實施例1 ) (板狀樣本（導光板）的調製） 在PMMA (住友化學（股）製「SUMIPEX EXN」、折 射率：1.49)，將架橋砂酮微粒子（日本 Momentive Performance Materials 有限責任公司製「Tospearl 145」 、折射率：1 .4 2、平均粒徑：4 // m )按1 0 p p m之比例混合 。其次，藉由使用1軸壓出機（螺旋徑20mm)，並使樹 脂溫度成25(TC之方式溶融混練後壓出成線束狀，且水冷 後用線束切割器（strand cutter )切斷，得到九狀的甲基 丙烯酸樹脂組成物（導光板用樹脂組成物）。 將所得到的1 6〇g九狀樹脂組成物予以加熱壓縮成形 ，調製出具有厚度3 mm之210mm正方的板狀樣本（導光 板）。 (實施例2) 將「Tospearl 145」按lppm的比例混合以外，與實施 -11 - 201249914 例1同樣做法得到甲基丙烯酸樹脂組成物，調製出板狀樣 本。 (比較例1及2) 取代架橋矽酮微粒子「Tospearl 145」，而用聚苯乙 烯微粒子（積水化成品工業（股）製「SBX-12」、折射率 :1 · 5 9、平均粒徑：丨2 // m )按表1所示比例混合以外， 與實施例1同樣做法後得到甲基丙烯酸樹脂組成物，調製 出板狀樣本。 用實施例1、比較例1及2所得到之板狀樣本，進行 平均光線透過率、黃度指數（YI)、以及全光束量之評價 。詳細方法如下。 <光路長200 mm下可見光的平均光線透過率之測定> 以圖2所示方法，將所得到的板狀樣本切斷成幅寬 50mmx長度200mm的大小。其次，將4個側面51用硏磨 機(MEGARO TECHNICA (股）製「PLA-BEAUTY -PB-5 00」）硏磨，得到試驗片50。 採用日立製作所（股）製的塑料特性測定系統（由 U-4000型分光光度計及大型試料室積分球附屬裝置所構 成），將該試驗片50之光路長200mm的光線透過率，於 波長300nm〜800nm的範圍下每5nm予以測定，且將所得 到之光線透過率之算數平均値做成「可見光的平均光線透 過率」。將結果顯示於表1。 -12- 201249914 <黃度指數（YI)之評價> 採用上述塑料特性測定系統，將上述試驗片5 0之光 路長200mm的光線透過率，於波長300nm〜800nm之範圍 下每5nm予以測定，且從所得到之測定値，根據JIS Z-8722記載之方法求出XYZ値，並根據JIS K-7105記載之 方法算出黃色度（YI ) 。Y】低於1 0之場合，評價爲黃色 度被抑制住。將結果顯示於表1。 <全光束量之測定> 以圖3所示方法，將所得到的板狀樣本切斷成幅寬 60mmx長度80mm的大小。其次，將4個側面611、612、 613、614 用硏磨機（MEGARO TECHNIC A (股）製「 PLA-BEAUTY -PB-5 00」）予以硏磨，得到試驗片6 0。 該試驗片60的4個側面之中，以只從1個側面61 1 把光射入之方式照射6個LED燈62，餘下的側面61 2、 6 1 3、6 1 4，則在內側黏合具有黑色黏貼面的膠帶及在外側 黏合具有白色面的膠帶（寺岡製作所（股）製的反射.遮 光用薄片單面膠帶63 70 )。藉由以該方式黏合膠帶，就能 測定出從側面6 1 1被照射的光，在試驗片6 0雙面的面方 向所發出的光量。 其次，將試驗片60放妥於NEMUTECH (英譯）（股 )製的球面光束計（型式1500型、直徑1500mm)內，並 用 Labsphere 公司製的 Diode Array Spectrometer (Model -13- 201249914 DAS’ 1100/2100)的 SLMS software，測定波長領域 350 〜800nm的光束量。將結果顯示於表i。 [表1] 微粒子 平均光線 透過率 (〇/〇) YI 全光束量 (lms) 種類 粒徑 (“m) 含有率 (PPm) 實施例1 砂酮 4 10 62.5 7.1 8 實施例2 矽酮 4 1 80.8 5.2 6 比較例1 聚苯乙烯 12 10 68.2 7.9 4 比較例2 聚苯乙烯 12 100 29.0 11.8 7 如表1所示’可知，採用本發明樹脂組成物之實施例 1及2之板狀樣本（導光板），黃色度可充分被抑制，並 且光的射出效率佳。另一方面，可知，比較例1的板狀樣 本（導光板），其光的射出效率較低。此外，可知，比較 例2的板狀樣本（導光板），其黃色度未被抑制。 【圖式簡單說明】 圖1係顯示本發明液晶顯示裝置之一實施型態之模式 的側面圖。 圖2係在光路長200mm下波長領域300nm〜800nm之 平均光線透過率的測定法之說明圖。 圖3係全光束量的測定法之說明圖。 【主要元件符號說明】 -14- 201249914 1 :液晶顯示裝置 2 :光源 3 :導光板 4 :光擴散板 5 :燈箱（lamp box ) 9 =面光源裝置 1 1 :液晶 1 2、1 3 :透明電極 1 4、1 5 :偏光板 20 :液晶胞（cell ) 3 0 :液晶面板 5 〇 :試驗片（導光板） 5 1 :試驗片（導光板）的側面 60 :試驗片（導光板）The transparent resin contained in the resin composition of the present invention is not particularly limited as long as it is transparent, and has a composition of a weight average molecular weight or the like. For example, methacrylic resin (polymethyl methacrylate (PMMA), etc.), polycarbonate resin, acrylonitrile butadiene styrene copolymer resin (ABS 201249914 resin), polystyrene resin, propylene Among the nitrile styrene copolymer resins (AS resins), polyolefin resins (polyethylene, polypropylene, etc.), etc., methacrylic resins are preferred. The fluorenone resin fine particles contained in the resin composition of the present invention are used for diffusing light that has passed through the light guide plate. The fluorenone resin fine particles, the average particle diameter, the weight average molecular weight and the like are not particularly limited. In order to diffuse the light more efficiently, the fluorenone resin fine particles preferably have an average particle diameter of 1 to 12#!« or more, and have an average particle diameter of 2 to 6 μm. The fluorenone resin fine particles are preferably contained in a ratio of 0.1 to 200 ppm, more preferably 1 to 90 ppm, more preferably 1 to 50 ppm, and particularly preferably 1 to 10 ppm, based on the total weight of the resin composition. In the resin composition of the present invention, the average light transmittance of the wavelength range of 300 nm to 800 nm measured in the optical path length of 200 mm when the molded article is formed is 25 to 85%, preferably 40 to 70%, whereby the obtained composition can be suppressed. The yellowness of the light guide plate is increased in brightness. <Light Guide Plate> The light guide plate of the present invention is composed of the above resin composition. Specifically, the light guide plate of the present invention is formed by, for example, extruding a resin composition by an extrusion molding method, an injection molding method, a hot press molding method, or the like, to obtain a light guide plate, for example, an ultraviolet absorber, or a UV absorber. Thermal stabilizer, antioxidant, weathering agent, light stabilizer, fluorescent brightener, plus 201249914 work stabilizer and other additives. The thickness of the light guide plate is not particularly limited and is usually 〇. 5 to 15 mm, preferably 0.1 to 10 mm, more preferably 0.5 to 5 mm. <surface light source device and liquid crystal display device> Next, a surface light source device using a light guide plate composed of the resin composition of the present invention and a liquid crystal display device using the same are shown in Fig. 1 The surface light source device 9 and the liquid crystal panel 3 are provided, and the surface light source device 9 is disposed on the back side of the liquid crystal panel 30. The liquid crystal panel 30 has a liquid crystal cell 20 in which the liquid crystal 1 1 is sealed between the pair of transparent electrodes 1 2 and 1 3 disposed in parallel with each other, and is disposed on the upper and lower sides of the liquid crystal cell 20 The polarizing plates 14 and 15. The image display unit is constituted by the liquid crystals 1 1 , the transparent electrodes 1 2 and 1 3, and the polarizing plates 14 and 15 . Further, an alignment film (not shown) is laminated on the inner surfaces (surfaces on the liquid crystal side) of the transparent electrodes 12 and 13 respectively. The surface light source device 9 is disposed on the lower surface side (back surface side) of the polarizing plate 15 described above. The surface light source device 9 includes a thin box-shaped light box 5 having a rectangular shape in a plan view and having an upper surface side (front side) opened, a light guide plate 3 and a light source 2 housed in the light box 5, and being blocked by the light box 5. The light diffusing plate 4 is configured and fixed in such a manner as to open the surface. The light source 2 is, for example, an LED (Light Emitting Diode) light source or the like, and is disposed at a lateral position of the light guide plate 3. The light box 5 is composed of a white acrylic resin plate. On the back surface 3a of the light guide plate 3, a dot print portion (dot pattern -9-201249914; dot pattern) in which white ink is formed constitutes light incident from one side of the light guide plate 3 into the light guide plate 3. The light is reflected from the dot printing portion to uniformly emit light from the front surface of the light guide plate 3 (that is, the 'light emitting surface 3 b ). Further, the light guide plate 3 to be used may, for example, be honed by the circumferential side surface 51 as shown in Fig. 2, or may be subjected to light diffusion treatment for uniformizing the light on the light exit surface 3b. Further, instead of the dot pattern printing using white ink or the like, the back surface 3a of the light guide plate 3 may be subjected to light diffusion treatment such as formation of prism or the like, or may be applied to the light exit surface 3b of the light guide plate. A light reflection layer such as a silver vapor-deposited film or sheet is provided on the other surface. According to this configuration, the liquid crystal display device 1 of the present invention can emit light having a high whiteness, which is substantially free of yellow odor, from the surface light source device 9 to the liquid crystal panel 30 with high brightness. The color of the liquid crystal panel 30 is correctly reproduced. Thereby, it is possible to realize a bright color display which is not yellow, natural and high quality. In the liquid crystal display device 1 shown in Fig. 1, the light source 2 is disposed on one side of the four side faces of the light guide plate 3. However, the configuration is not particularly limited. For example, a configuration in which the light source 2 is disposed on each of a pair of side faces of the light guide plate 3 facing each other may be employed. Further, the light source 2 is not particularly limited, and examples thereof include a linear light source such as a cold cathode tube, a hot cathode tube, an external electrode fluorescent lamp (EEFL), or a point light source such as a light emitting diode (LED). Wait. According to the present invention, it is possible to provide a composition for a light guide plate resin -10- 201249914 which is suitable for use in a light guide plate having a yellowness which is sufficiently suppressed and which is excellent in light emission efficiency. Thus, the present invention is useful in the field of liquid crystal display devices and the like. The light guide plate of the present invention is particularly suitable for use in a liquid crystal display device having an LED light source for use in a large screen such as a television. [Examples] Hereinafter, the present invention will be specifically described by way of Examples and Comparative Examples, but the present invention is not limited to the Examples. (Example 1) (Preparation of a plate-shaped sample (light guide plate)) In PMMA ("SUMIPEX EXN" manufactured by Sumitomo Chemical Co., Ltd., refractive index: 1.49), urethane microparticles (made by Japan Momentive Performance Materials Co., Ltd.) "Tospearl 145", refractive index: 1.4, 2. Average particle size: 4 // m) Mixed at a ratio of 10 ppm. Next, by using a 1-axis extruder (spiral diameter of 20 mm) and a resin temperature of 25 (TC), the mixture was melted and kneaded into a strand shape, and after water cooling, it was cut with a strand cutter. Nine-shaped methacrylic resin composition (resin composition for light guide plate). The obtained 16 〇g nine-shaped resin composition was heat-compressed and molded to prepare a 210 mm square plate sample having a thickness of 3 mm ( (Light Guide Plate) (Example 2) A methacrylic resin composition was obtained in the same manner as in Example 1 of -11 - 201249914, except that "Tospearl 145" was mixed at a ratio of 1 ppm. 2) Replacing the bridge fluorene ketone granule "Tospearl 145" and using polystyrene granules ("SX-12" manufactured by Sekisui Chemicals Co., Ltd.), refractive index: 1.9, average particle diameter: 丨2 // m The methacrylic resin composition was obtained in the same manner as in Example 1 except that the mixture was mixed in the same manner as in Example 1 to prepare a plate-like sample. The plate-like samples obtained in Example 1, Comparative Examples 1 and 2 were averaged. Light transmittance, yellowness The number (YI) and the total beam amount are evaluated. The detailed method is as follows: <Measurement of average light transmittance of visible light with an optical path length of 200 mm> The obtained plate-like sample is cut into the method shown in Fig. 2 The width is 50 mm x and the length is 200 mm. Next, the four side faces 51 are honed by a honing machine ("PLA-BEAUTY - PB-5 00" manufactured by MEGARO TECHNICA Co., Ltd.) to obtain a test piece 50. Hitachi, Ltd. The plastic characteristic measuring system (composed of a U-4000 spectrophotometer and a large sample cell integrating sphere attachment device), and the light transmittance of the test piece 50 having an optical path length of 200 mm is in the range of 300 nm to 800 nm. The measurement was performed every 5 nm, and the average of the obtained light transmittance was made into "the average light transmittance of visible light". The results are shown in Table 1. -12- 201249914 <Evaluation of yellowness index (YI)> According to the above-described plastic property measuring system, the light transmittance of the optical path of the test piece 50 of 200 mm is measured every 5 nm in the range of 300 nm to 800 nm, and the obtained measurement is described in accordance with JIS Z-8722. Square XYZ値 was obtained, and the yellowness (YI) was calculated according to the method described in JIS K-7105. When Y was less than 10, the yellowness was suppressed. The results are shown in Table 1. <Full beam amount Measurement> The obtained plate-like sample was cut into a width of 60 mm x a length of 80 mm by the method shown in Fig. 3. Next, four sides 611, 612, 613, and 614 were used for a honing machine (MEGARO TECHNIC A). The "shares" "PL-BEAUTY - PB-5 00" was honed to obtain a test piece 60. Among the four side faces of the test piece 60, six LED lamps 62 are irradiated so that light is incident from only one side surface 61 1 , and the remaining side faces 61 2, 6 1 3, and 6 1 4 are bonded to the inside. A tape having a black adhesive surface and a tape having a white surface bonded to the outside (reflection made by Teraoka Seisakusho Co., Ltd., single-sided tape 63 70 for light-shielding). By bonding the tape in this manner, the amount of light emitted from the side surface 61 1 and the amount of light emitted from the surface of both sides of the test piece 60 can be measured. Next, the test piece 60 was placed in a spherical beam meter (type 1500, diameter 1500 mm) manufactured by NEMUTECH (English), and a Diode Array Spectrometer (Model -13- 201249914 DAS' 1100/ manufactured by Labsphere Corporation was used. 2100) SLMS software, measuring the amount of light in the wavelength range of 350 ~ 800nm. The results are shown in Table i. [Table 1] Average light transmittance of microparticles (〇/〇) YI Total beam amount (lms) Species particle size ("m) Content ratio (PPm) Example 1 Sand ketone 4 10 62.5 7.1 8 Example 2 Anthrone 4 1 80.8 5.2 6 Comparative Example 1 Polystyrene 12 10 68.2 7.9 4 Comparative Example 2 Polystyrene 12 100 29.0 11.8 7 As shown in Table 1, it is understood that the plate-like samples of Examples 1 and 2 using the resin composition of the present invention ( In the light guide plate, the yellowness is sufficiently suppressed, and the light emission efficiency is good. On the other hand, it is understood that the plate-like sample (light guide plate) of Comparative Example 1 has low light emission efficiency. Fig. 1 is a side view showing a mode of an embodiment of the liquid crystal display device of the present invention. Fig. 2 is a length of 200 mm in the optical path of the plate-like sample (light guide plate) of Fig. 2. Fig. 3 is an explanatory diagram of the measurement method of the average light transmittance in the lower wavelength range of 300 nm to 800 nm. Fig. 3 is an explanatory diagram of the measurement method of the total beam amount. [Description of main component symbols] -14- 201249914 1 : Liquid crystal display device 2: Light source 3 : Light guide plate 4: Light diffusing plate 5: Light box ( Lamp box ) 9 = surface light source device 1 1 : liquid crystal 1 2, 1 3 : transparent electrode 1 4, 1 5 : polarizing plate 20 : liquid crystal cell 3 0 : liquid crystal panel 5 〇: test piece (light guide plate) 5 1 : Side surface 60 of test piece (light guide plate): test piece (light guide plate)
6 1 1、6 1 2、6 1 3、6 1 4試驗片（導光板）的側面 62 ： LED -15-6 1 1,6 1 2,6 1 3,6 1 4 Side of the test piece (light guide plate) 62 : LED -15-