201249915 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】 作爲液晶顯示裝置或照明裝置等之背光，例如，習知[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, a lighting device, or the like, for example, a conventional one
的背光，構成方式是在導光板側方配置冷陰極管或LED 等光源，使來自光源的光，反射到被形成在導光板背面的 點圖案或稜鏡部等，使得光能夠從導光板前面均一地射出 〇 作爲背光用的導光板，習知是使微粒子分散在壓克力 系樹脂等的透明樹脂中之導光板。使微粒子分散在透明樹 脂中之導光板，其透過光容易帶有黃色味（亦即，黃度指 數（YI )値較大），而採用該種導光板之液晶顯示裝置， 其影像便稍微帶有黃色味，無法得到高品質的影像。 作爲抑制透過光帶黃色味之導光板，在專利文獻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5 0 %粒子徑之積滿足特 定範圍之導光板。 但是，該專利文獻1之導光板，係有黃色度未被充分 抑制之場合，而且，有光的射出效率並不足夠之場合。 〔先前技術文獻〕 〔專利文獻〕 -5- 201249915 〔專利文獻1〕日本特開2010-92755號公報 【發明內容】 〔發明所欲解決之課題〕 本發明之目的係提供一種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。 〔供解決課題之手段〕 本發明之導光板用樹脂組成物，係具有以下之構成。 (1 )導光板用樹脂組成物，係含有透明樹脂與金紅 石型氧化鈦微粒子。 (2 )如（1 )記載之樹脂組成物，其中，前述金紅石 型氧化鈦微粒子，相對於前述樹脂組成物之總重量，含有 比例在〇.〇1〜5ppm® (3 )如（1 )或（2 )記載之樹脂組成物，其中，前 述透明樹脂爲甲基丙烯酸樹脂（methacrylicresin)。 (4 )如（1 )〜（3 )任一項記載之樹脂組成物，其 中，在將前述樹脂組成物做成成形體時之，光路長200mm 下被測定之波長領域300nm〜800nm之平均光線透過率， 爲1 5〜85%。 (5 )導光板，係由（1 )〜（4 )任一項記載之樹脂 組成物所構成。The backlight is configured by arranging a light source such as a cold cathode tube or an LED on the side of the light guide plate to reflect light from the light source to a dot pattern or a crotch portion formed on the back surface of the light guide plate, so that light can be from the front of the light guide plate. A light guide plate for emitting backlights uniformly is known as a light guide plate in which fine particles are dispersed in a transparent resin such as an acrylic resin. A light guide plate in which fine particles are dispersed in a transparent resin, the transmitted light is easily yellowish (that is, a yellowness index (YI) is large), and the liquid crystal display device using the light guide plate has a slight image. It has a yellow color and cannot get high quality images. Patent Document 1 discloses a light guide plate that suppresses the absolute enthalpy of the difference between the refractive index of the transparent resin and the refractive index of the fine particles, and the product of the cumulative particle diameter of the fine particles of 50%. Meet a specific range of light guides. However, the light guide plate of Patent Document 1 has a case where the yellowness is not sufficiently suppressed, and the light emission efficiency is not sufficient. [Prior Art Document] [Patent Document] -5-201249915 [Patent Document 1] JP-A-2010-92755 SUMMARY OF INVENTION [Problem to be Solved by the Invention] An object of the present invention is to provide a yellow color suitable for modulating A resin composition for a light guide plate of a light guide plate having a sufficient degree of light emission and excellent light emission efficiency. [Means for Solving the Problem] The resin composition for a light guide plate of the present invention has the following constitution. (1) A resin composition for a light guide plate containing a transparent resin and rutile-type titanium oxide fine particles. (2) The resin composition according to (1), wherein the rutile-type titanium oxide fine particles are contained in a ratio of 〇.〇1 to 5 ppm® (3 ) as (1) with respect to the total weight of the resin composition. Or a resin composition according to (2), wherein the transparent resin is methacrylic resin. (4) The resin composition according to any one of (1) to (3), wherein, when the resin composition is a molded body, an average light of a wavelength region of 300 nm to 800 nm measured in an optical path length of 200 mm is measured. The transmittance is 1 5 to 85%. (5) A light guide plate comprising the resin composition according to any one of (1) to (4).
(6)如（5)記載之導光板，其中，係在具備LED 201249915 光源之液晶顯示裝置所使用。 (7) 面光源裝置，係具備（5)或（6)記載之導光 板。 (8) 液晶顯示裝置，係如（7 )記載之面光源裝置是 被配置於液晶面板的背面側。 〔發明之效果〕 根據本發明，能夠提供一種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。 【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），係含有透明樹脂與金紅石型氧 化鈦微粒子。 本發明之樹脂組成物所含有之透明樹脂，只要是透明 的，組成、重量平均分子量等並不特別受限定。例如，可 以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、聚丙稀等。其中 ，仍以甲基丙烯酸樹脂較佳。 本發明之樹脂組成物所含有之金紅石型氧化駄微粒子 201249915 ，係被用作讓透過導光板之光予以擴散。 氧化鈦，依結晶構造之不同，存在金紅石型、 Anatase型等之種類，而本發明係採用金紅石型氧化鈦微 粒子。金紅石型氧化鈦微粒子，爲了使光擴散的效率更佳 ，以具有平均粒徑0.1〜4μηι較佳，而具有平均粒徑0.2〜 0.8 μ m更好。 金紅石型氧化鈦微粒子，相對於樹脂組成物之總重量 ，最好含有比例在0_01〜5ppm、在0.1〜3ppm較佳，更 好是比例在0.1〜lppm。 本發明之樹脂組成物，做成成形體時在光路長2 0 0mm 下被測定之波長領域3 00nm〜800nm之平均光線透過率， 最好是15〜85%，以25〜70%更好，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，可利用壓出成形法、射出 成形法、熱壓成形法等將上述樹脂組成物加以成形而得到 〇 於前述導光板，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 工安定劑等各種添加劑。 導光板的厚度，並未特別受限定，通常爲 0.05〜 15mm，以〇·1〜l〇mm較佳，更好是0.5〜5mm。 201249915 〈面光源裝置以及液晶顯示裝置〉 其次，在圖1顯示採用由本發明樹脂組成物所構成的 導光板之面光源裝置以及採用此之液晶顯示裝置之一實施 型態。 該液晶顯示裝置1，係具備面光源裝置9與液晶面板 30，而面光源裝置9被配置在液晶面板30之背面側。 液晶面板3 0，具備在相互離間而配置爲平行狀的上下 一對透明電極1 2、1 3之間被封入液晶1 1而成的液晶胞20 、與被配置於液晶胞20的上下兩側之偏光板1 4、1 5。利 用該等之液晶1 1、透明電極1 2、1 3、以及偏光板1 4、1 5 而構成影像顯示部。又，透明電極12、13的內面（液晶 側之面）分別被層積配向膜（未圖示）。 面光源裝置9，被配置於上述偏光板15的下面側（背 面側）。該面光源裝置9係具備：平面俯視爲矩形狀上面 側（前面側）爲開放的薄箱型形狀之燈箱（lampbox ) 5、 及被收容於該燈箱5內之導光板3及光源2、及對燈箱5 以塞住該開放面的方式被配置而固定之光擴散板4。光源 2，爲例如LED (發光二極體）光源等，被配置於導光板 3的側方位置。 燈箱5,係由白色壓克力系樹脂板所構成。在導光板 3的背面3a，形成由白色油墨所做成的點陣印刷部（點陣 圖形），藉由從光源2到導光板3內自該一側面射入之光 ，利用點陣印刷部使之反射，構成得以讓光從導光板3的 -9- 201249915 前面（亦即，光射出面3 b )均一地射出。 又，所使用的導光板3，例如，可以如圖2所示讓周 側面5 1被硏磨處理，也可以爲了在光射出面3 b均一地射 出光而施以光擴散處理。又，在導光板3的背面3a，取代 採用白色油墨等之點陣印刷，可以施以形成稜鏡（prism )等的光擴散處理，或者，也可以在導光板的光射出面3b 以外的面，設置被銀蒸鍍過之薄片或薄膜等的光反射層。 藉由以此方式被構成，本發明之液晶顯示裝置1，因 爲可從面光源裝置9讓實質地不帶有黃色味的、白色度高 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30的顏色。從而，能夠實現並不帶黃色味、 且自然、高品質的、明亮的色彩顯示。 圖1所示之液晶顯示裝置1方面，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 受限定於此類之構成。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，並未特別受限定，可舉出例如冷陰 極管 '熱陰極管、外部電極螢光燈（EEFL)等的線狀光源 ，或發光二極體（LED )等的點狀光源等。 根據本發明，能夠提供一種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。從而，本發明，在液晶顯示裝置等之領域上是有用 的。本發明之導光板，特別適合被使用於電視之類具備大 畫面的LED光源之液晶顯示裝置。 -10- 201249915 〔實施例〕 以下，舉出實施例以及比較例具體說明本發明，但本 發明並不以此等實施例爲限。 (實施例1 ) (板狀樣本（導光板）的調製） 在PMMA (住友化學（股）製「SUMIPEXEXN」、折 射率：1.49 )，將金紅石型氧化鈦微粒子（堺化學工業（ 股）製「R-42」、折射率：2.6、平均粒徑：〇·3μιη )按 0.1 ppm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250 °C之方式溶融混練後壓出成 線束狀，且水冷後用線束切割器（strandcutter )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） 〇 將所得到的1 60g九狀樹脂組成物予以加熱壓縮成形 ，調製出具有厚度3mm之210mm正方的板狀樣本（導光 板）。 (實施例2) 將金紅石型氧化鈦微粒子「R-42」按lppm的比例混 合以外，與實施例1同樣做法得到甲基丙烯酸樹脂組成物 ，調製出板狀樣本。 -11 - 201249915 (比較例1、2 ) 取代金紅石型氧化鈦微粒子「R-42」，而用Anatase 型氧化鈦微粒子（堺化學工業（股）製「A-1 1 0」、折射 率：2.6 '平均粒徑：0.2μπι)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。 (比較例3、4 ) 取代金紅石型氧化鈦微粒子「R-42」，而用聚苯乙烯 微粒子（積水化成品工業（股）製「SBX-12」、折射率： 1.59、平均粒徑：12μιη)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。 用各實施例及比較例所得到之板狀樣本，進行平均光 線透過率、黃度指數（ΥΙ )、以及全光束量之評價。詳細 方法如下。 〈光路長200mm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 5 Ommx長度200mm的大小。其次，將4個側面51用硏磨 機（MEGAROTECHNICA (股）製「PLA-BEAUTY-PB-500 j )硏磨，得到試驗片5 0。 採用日立製作所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 -12- 201249915 該試驗片50之光路長200mm的光線透過率，於波長 3 00nm〜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。 〈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JISZ-8722記載之方法求出XYZ値，並根據JISK-7105記載之 方法算出黃色度（YI ) 。YI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（MEGAROTECHNICA (股）製「PLA-BEAUTY-PB-500」）予以硏磨，得到試驗片60 » 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6 1 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60雙面的面方 -13- 201249915 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 DAS-1100/2100)的 SLMS software’ 測定波長領域 350 〜 800nm的光束量。將結果顯不於表1。 【表1】 微粒子 平均光線 透過率 (%) VI 全光束量 (Ims) 種類 p粒徑丨含有率 (μ«η) j (ppm) 實施例1 二氧化鈦 (Rutile型） 0. 3 1 0. 1 * 59. 6 7. 8 6 實施例2 二氧化鈦 (Rutile型） 0. 3 I 1 33. 1 5. 5 10 比較例1 二氧化鈦 (Anatase 型） ： 0. 2 I 0. 1 69. 3 18. 5 5 比較例2 二氧化鈦 (Anatase 型) 0. 2 I 1 38. 5 54. 8 10 比較例3 聚苯乙烯 12 | 10 68. 2 7. 9 4 比較例4 聚苯乙烯 12 | 100 i 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 以及2之板狀樣本（導光板），黃色度被充分抑制，並且 光射出效率優異。另一方面，可知，比較例1、2以及4 之板狀樣本（導光板），其黃色度並未被抑制。此外，可 知’比較例3之板狀樣本（導光板），光射出效率低。 【圖式簡單說明】 -14 - 201249915 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係光路長2〇〇mm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係全光束量之測定法之說明圖。 【主要元件符號說明】 1 :液晶顯示裝置 2 :光源 3 :導光板 4 :光擴散板 5 :燈箱 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 2 0 :液晶胞 3 0 :液晶面板 5 0 :試驗片（導光板） 5 1 :試驗片（導光板）之側面 60:試驗片（導光板）(6) The light guide plate according to (5), which is used in a liquid crystal display device including a light source of LED 201249915. (7) The surface light source device includes the light guide plate described in (5) or (6). (8) In the liquid crystal display device, the surface light source device according to (7) 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 modulating a light guide plate in which the yellowness is sufficiently suppressed and the light emission efficiency is excellent. [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 rutile titanium oxide fine particles. The transparent resin contained in the resin composition of the present invention is not particularly limited as long as it is transparent, and the composition, weight average molecular weight and the like. For example, methacrylic resin (polymethyl methacrylate (PMMA), etc.), polycarbonate resin, acrylonitrile butadiene styrene copolymer resin (ABS resin), polystyrene resin, acrylonitrile a styrene copolymer resin (AS resin), a polyolefin resin (polyethylene, polypropylene, etc., among which methacrylic resin is still preferred. The rutile-type cerium oxide microparticles 201249915 contained in the resin composition of the present invention, It is used to diffuse light that has passed through the light guide plate. Titanium oxide has a rutile type or an Anase type depending on the crystal structure, and the present invention uses rutile-type titanium oxide fine particles. Rutile-type titanium oxide. The fine particles, in order to make the light diffusion more preferable, have an average particle diameter of 0.1 to 4 μm, preferably have an average particle diameter of 0.2 to 0.8 μm. The rutile-type titanium oxide fine particles are based on the total weight of the resin composition. Preferably, the ratio is in the range of 0 to 01 ppm, preferably 0.1 to 3 ppm, more preferably 0.1 to 1 ppm. The resin composition of the present invention is formed into a molded body at an optical path length of 2 0 0 The average light transmittance of the wavelength range of 300 to 800 nm measured in mm is preferably 15 to 85%, more preferably 25 to 70%, whereby the yellowness of the obtained light guide plate can be suppressed and high luminance can be achieved. <Light Guide Plate> The light guide plate of the present invention is composed of the above-described resin composition. Specifically, the light guide plate of the present invention can be, for example, an extrusion molding method, an injection molding method, a hot press molding method, or the like. The resin composition may be molded to obtain the light guide plate, and various additives such as an ultraviolet absorber, a heat stabilizer, an antioxidant, an weather resistance agent, a photosetter, a fluorescent whitening agent, and a processing stabilizer may be added. The thickness of the light plate is not particularly limited, and is usually 0.05 to 15 mm, preferably 〇1 to 10 mm, more preferably 0.5 to 5 mm. 201249915 <surface light source device and liquid crystal display device> Next, shown in Fig. 1 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. The liquid crystal display device 1 is provided with a surface light source device 9 and a liquid crystal. In the plate 30, the surface light source device 9 is disposed on the back side of the liquid crystal panel 30. The liquid crystal panel 30 is provided with liquid crystals 1 1 between the pair of upper and lower transparent electrodes 1 2 and 1 3 which are arranged in parallel with each other. The liquid crystal cells 20 and the polarizing plates 14 and 15 disposed on the upper and lower sides of the liquid crystal cell 20. The liquid crystals 1 1 , the transparent electrodes 1 2, 1 3, and the polarizing plates 14 and 1 are used. 5, the image display unit is formed, and the inner surfaces (surfaces on the liquid crystal side) of the transparent electrodes 12 and 13 are laminated with an alignment film (not shown). The surface light source device 9 is disposed on the lower surface side of the polarizing plate 15. (back side). The surface light source device 9 includes a thin box-shaped lamp box 5 in which a rectangular upper surface side (front side) is open in plan view, a light guide plate 3 and a light source 2 housed in the light box 5, and The light diffusing plate 4 is fixed to the light box 5 so as to be plugged to the open 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. A dot print portion (dot pattern) made of white ink is formed on the back surface 3a of the light guide plate 3, and the dot print portion is used by the light incident from the light source 2 into the light guide plate 3 from the one side surface. It is reflected so as to allow light to be uniformly emitted from the front surface of the light guide plate 3, -9-201249915 (that is, the light exit surface 3b). Further, as the light guide plate 3 to be used, for example, the circumferential side surface 51 may be honed as shown in Fig. 2, or light diffusion treatment may be applied to uniformly emit light on the light exit surface 3b. Further, in the back surface 3a of the light guide plate 3, instead of dot matrix printing using white ink or the like, light diffusion treatment such as forming a prism may be applied, or a surface other than the light exit surface 3b of the light guide plate may be applied. A light reflection layer such as a sheet or a film which has been subjected to silver evaporation is provided. According to this configuration, the liquid crystal display device 1 of the present invention can emit light having a high whiteness and substantially high luminance from the surface light source device 9 to the liquid crystal panel 30 with high brightness. The color of the liquid crystal panel 30 can be correctly reproduced. Thereby, it is possible to realize a bright color display which is not yellow, and which is natural and high quality. In the liquid crystal display device 1 shown in Fig. 1, the light source 2 is disposed on one side surface 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 opposed to each other may be employed. In addition, the light source 2 is not particularly limited, and examples thereof include a linear light source such as a cold cathode tube 'hot cathode tube, an external electrode fluorescent lamp (EEFL), or a dot shape such as a light emitting diode (LED). Light source, etc. According to the present invention, it is possible to provide a resin composition for a light guide plate which is suitable for modulating a light guide plate in which the yellowness is sufficiently suppressed and the light emission efficiency is excellent. Accordingly, 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 a large-screen LED light source such as a television. -10-201249915 [Examples] Hereinafter, the present invention will be specifically described by way of Examples and Comparative Examples, but the present invention is not limited thereto. (Example 1) (Preparation of a plate-shaped sample (light guide plate)) In the PMMA ("SUMIPEXEXN" manufactured by Sumitomo Chemical Co., Ltd., refractive index: 1.49), rutile-type titanium oxide fine particles (manufactured by Nippon Chemical Industry Co., Ltd.) "R-42", refractive index: 2.6, average particle diameter: 〇·3 μιη) was mixed at a ratio of 0.1 ppm. Next, it was melted and kneaded by using a 1-axis extruder (spiral diameter of 20 mm) and the resin temperature was 250 ° C, and then extruded into a strand shape, and after water cooling, it was cut with a strand cutter to obtain nine. A methacrylic resin composition (resin composition for a light guide plate) 〇 The obtained 1 60 g of the nine-shaped resin composition was heated and compression-molded to prepare a plate-shaped sample (light guide plate) having a thickness of 3 mm and a square of 210 mm. (Example 2) A methacrylic resin composition was obtained in the same manner as in Example 1 except that the rutile-type titanium oxide fine particles "R-42" were mixed at a ratio of 1 ppm to prepare a plate-like sample. -11 - 201249915 (Comparative Examples 1 and 2) In place of rutile-type titanium oxide fine particles "R-42", Anatase-type titanium oxide fine particles ("A-1 10" manufactured by Seiko Chemical Co., Ltd.) and refractive index: 2.6 'Average particle diameter: 0.2 μm 1> A methacrylic resin composition was obtained in the same manner as in Example 1 except that the mixture was mixed in the proportions shown in Table 1, and a plate-like sample was prepared. (Comparative Examples 3 and 4) Instead of rutile-type titanium oxide fine particles "R-42", polystyrene fine particles ("SX-12" manufactured by Sekisui Kogyo Co., Ltd.), refractive index: 1.59, average particle diameter: In the same manner as in Example 1, except that the mixture was mixed at a ratio shown in Table 1, a methacrylic resin composition was obtained to prepare a plate-like sample. Using the plate-like samples obtained in the respective examples and comparative examples, the average light transmittance, the yellowness index (ΥΙ), and the total beam amount were evaluated. The detailed method is as follows. <Measurement of Average Light Transmittance of Visible Light at an Optical Path Length of 200 mm> The obtained plate-like sample was cut into a size of a width of 5 Omm x and a length of 200 mm by the method shown in Fig. 2 . Next, the four side faces 51 were honed by a honing machine ("PLA-BEAUTY-PB-500 j" manufactured by MEGAROTECHNICA Co., Ltd.) to obtain a test piece 50. A plastic characteristic measuring system manufactured by Hitachi, Ltd. (by U-4000) a spectrophotometer and a large sample chamber integrating sphere attachment device), -12-201249915 The light transmittance of the test piece 50 having an optical path length of 200 mm is measured every 5 nm in a wavelength range of 300 nm to 800 nm, and The arithmetic mean of the obtained light transmittance is "the average light transmittance of visible light". The results are shown in Table 1. <Evaluation of Yellowness Index (YI)> Using the above-described plastic property measuring system, the light transmittance of the optical path length of 200 mm of the test piece 50 was measured every 5 nm in the range of wavelengths of 300 nm to 800 nm, and obtained therefrom. The enthalpy was measured, and XYZ値 was obtained according to the method described in JIS Z-8722, and the yellowness (YI) was calculated according to the method described in JIS K-7105. When the YI is lower than 10, it is evaluated that the yellowness is suppressed. The results are shown in Table 1. <Measurement of total beam amount> The obtained plate-like sample was cut into a size of a width of 60 mm x a length of 80 mm by the method shown in Fig. 3 . Next, the four side faces 611, 612, 613, and 614 are honed by a honing machine ("PLA-BEAUTY-PB-500" manufactured by MEGAROTECHNICA Co., Ltd.) to obtain a test piece 60 » four sides of the test piece 60 Among them, six LED lamps 62 are irradiated with light from only one side surface 61 1 , and the remaining side faces 6 1 2, 6 1 3, and 6 1 4 are bonded to the inner side with a black adhesive surface. A tape having a white surface (a reflective and light-shielding sheet single-sided tape 63 70 made by Teraoka Seisakusho Co., Ltd.) is bonded to the outside. By bonding the tape in this manner, it is possible to measure the amount of light emitted by the light "irradiated from the side surface 61" on the both sides of the test piece 60 from -13 to 201249915. Next, the test piece 60 was placed in a spherical beam meter (type 1500 type, diameter 1500 mm) manufactured by NEMUTECH (English), and the SLMS of the Diode Array Spectrometer (Model DAS-1100/2100) manufactured by Labsphere was used. Software' measures the amount of light in the wavelength range from 350 to 800 nm. The results are not shown in Table 1. [Table 1] Average light transmittance of microparticles (%) VI Total beam amount (Ims) Type p particle size 丨 content rate (μ«η) j (ppm) Example 1 Titanium dioxide (Rutile type) 0. 3 1 0. 1 * 59. 6 7. 8 6 Example 2 Titanium dioxide (Rutile type) 0. 3 I 1 33. 1 5. 5 10 Comparative example 1 Titanium dioxide (Anatase type): 0. 2 I 0. 1 69. 3 18. 5 5 Comparative Example 2 Titanium Dioxide (Anatase Type) 0. 2 I 1 38. 5 54. 8 10 Comparative Example 3 Polystyrene 12 | 10 68. 2 7. 9 4 Comparative Example 4 Polystyrene 12 | 100 i 29. 0 11. 8 7 As shown in Table 1, the plate-like sample (light guide plate) of Examples 1 and 2 using the resin composition of the present invention was sufficiently suppressed in yellowness and excellent in light emission efficiency. On the other hand, it is understood that the yellowness of the plate-like sample (light guide plate) of Comparative Examples 1, 2, and 4 was not suppressed. Further, it can be seen that the plate-like sample (light guide plate) of Comparative Example 3 has low light emission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS -14 - 201249915 Fig. 1 is a side view showing a mode of an embodiment of a liquid crystal display device of the present invention. Fig. 2 is an explanatory diagram of a method for measuring the average light transmittance of a wavelength region of 300 nm to 800 nm in an optical path length of 2 〇〇 mm. Fig. 3 is an explanatory diagram of the measurement method of the total beam amount. [Description of main components] 1 : Liquid crystal display device 2 : Light source 3 : Light guide plate 4 : Light diffusing plate 5 : Light box 9 : Surface light source device 1 1 : Liquid crystal 1 2, 1 3 : Transparent electrode 1 4, 1 5 : Polarized light Plate 2 0 : Liquid crystal cell 3 0 : Liquid crystal panel 5 0 : Test piece (light guide plate) 5 1 : Side surface 60 of test piece (light guide plate): Test piece (light guide plate)
611、612、613、614:試驗片（導光板）之側面 62 ： LED -15-611, 612, 613, 614: side of test piece (light guide plate) 62 : LED -15-