200921150 九、發明說明： 【發明所屬之技術領域】 本發明係關於一 【先前技術】 種擴散片、背光模組及液晶 顯示裝置。 液晶顯不 板提供平面光 重要元件，用 到使液晶顯示 請參閱圖 置之立體分解 該液晶顯示裝 模組12。其中 平面光。 、北通：包括液晶顯示面板及給液晶顯示面 月光模組。其中，擴散片係背光模組中一 於將自光源發出之光束均勻擴散射出，以達 裝置輝度均勻之目的。 及圖2圖1係—種先前技術液晶顯示裝 圖’圖2係圖1所示擴散片之側面示意圖。 置1包括相鄰設置之液晶顯示面板11及背光 ，該背光模組12為該液晶顯示面板u提供 該背光模組12包括—導光板13、一反射片U、一光 源15及一擴散片16。該導光板13包括一入光面i3i、一 與該入光面ι31相鄰之出光面132及一與該出光面132相 f之底面133。該光源15鄰近該導光板13之入光面131 。又置該反射片14鄰近該導光板13之底面133設置。'該 擴政片16鄰近该導光板13之出光面131設置，失於該導 光板13與該液晶顯示面板11之間。 該光源15發出之光束沿該入光面131進入該導光板 13，—部份光束直接由該出光面132導出，另一部份光束 自該底面133射出經該反射片14反射後再由該出光面132 導出該擴散片^6將該導光板13之出光面132導出之光 6 200921150 束均勻擴散後提供給該液晶顯示面板n。 該擴散片16包括層疊設置之擴散層16〇及基底層 ^1。該擴散層160包括一基材162及散佈於其内之光學擴 月欠粒子164，且該光學擴散粒子164的一部份凸出於該基 材162表面，從而使得自該導光板13射出之光束更好=二 凸出於該基材162表面之光學擴散粒子164部份被擴散。 該基材162之材質為壓克力系樹脂（Acrylic Series Resin) ’ 該光學擴散粒子164之材質為墨克力，即該基材與該 光學擴散粒子164之折射率相近甚至相等。 人 擴：二并Ϊ閱圖3,係光線以60度進入擴散片16並經 ^片16處理後之出光輝度圖。其橫座標代表由擴散片 表面射出之出射光線與該擴散片16表面之法線所成的 二^ 表出光輝度中可以看出，光線經 “近m= i60度左右之平行出射光之出光輝度數 ，接近麵，而經光學擴散粒子164偏折後收光角产於％ =之出光輝度之數值僅接近2〇〇,該擴散片：光收敛 料-併參閱圖4，係背光模組12之 :線經過導光板13後由導光板13之出光 線之出光強度分佈圖。該出光強度分佈圖 二=二 出光強度，半徑座標代表由出光面132射出^ =表 ::面m之法線所成的角度。由圖 == ==度)_之強度較弱，其數值二= 7 200921150 如則所述，導光板13正向（〇度）出射光強度較弱，數 '值不大於25〇〇,較之左右方向之出射光強度大幅度下降， .無法有效收斂左右方向的光線。又由於擴散片16之基材 162與光學擴散粒子164之折射率相近甚至可能相等，即 一般業界採用折射率相等或者相近之光學擴散粒子與基 材，其光收斂性亦較差，因此常需要使用擴散片搭配增光 片，導正光形，增光片導正光形的效率極佳，然而其成本 偏高且折損率亦不低，表面輕微的摺痕或髒污都很容易顯 現，而且通常還需搭配保護用的上擴散片，以致於液晶顯 示裝置1成本較高。 【發明内容】 — 有鑑於此，提供一種可提高正向出光強度之擴散片實 為必要。 另’提供一種採用上述擴散片之背光模組亦為必要。 另’提供一種採用上述背光模組之液晶顯示裝置亦為 必要。 一種擴散片，其包括一擴散層，該擴散層包括基材及 _散佈於該基材内之光學擴散粒子，該光學擴散粒子之折射 率與該基材之折射率的比值大於或者等於1.2。 一種背光模組’其包括一光源及一接收該光源發出之 光線之擴散片，該擴散片包括一擴散層，該擴散層包括基 材及散佈於該基材内之光學擴散粒子，該光學擴散粒子之 折射率與該基材之折射率的比值大於或者等於1.2。 —種液晶顯示裝置，其包括一液晶顯示面板及鄰近該 8 200921150 液晶面板設置之背光模纟 收該光源發出之光組包括—光源及一接 ^ 九線之擴散片，該擴散片包括一擴散層， 該擴散層包括基材及散你於兮旦 、 政佈於該基材内之光學擴散粒子，該 光學擴散粒子之折射率愈_兮其# 等於丄2。 料與該基材之折射率的比值大於或者 頻一二技術’本發明之擴散片、背光模組及液晶 置之擴政層之光學擴散粒子之折射率與該該基材之 =㈣比值大於❹科1>2,該光學擴散粒子的折射 =對运大於該基材之折射率，使得擴散片在句化光線的 基礎上對光線起到的收斂作用，提高光線的正向出光 強度k而改善該月光模組及液晶顯示裝置之顯示 【實施方式】 請參閱圖5及圖6，目5係本發明液晶顯示襄置第一 實施方式之立體分解圖，圖6係該擴散片％之側面示音 圖。該液晶顯示裝置2包括一液晶顯示面板21及一相鄰： 液晶顯示面板21之背光模組22。該背光模組22為該液晶 顯示面板21提供平面光，其為側光式背光模組。 該背光模組22包括一導光板23、一反射片％、一光 源25及一擴散片26。該導光板23包括一出光面232、一 與該出光面232相對之底面233、一與該底面233、出光面 232相交之入光面231。該光源25鄰近該導光板23之入光 面231設置。該反射片24鄰近該導光板23之底面233設 置。該擴散片26鄰近該導光板23之出光面232設置，爽 於該液晶顯示面板21與該導光板23之間。該光源25為一 9 200921150 冷陰極螢光管（Cold Cathode Fluorescent Lamp，CCFL)。 該光源25發出之光束沿該入光面231進入該導光板 23, 一部份光束直接由該出光面231導出，另一部份光束 由該底面232射出經該反射片24反射後，再由該出光面 232導出。該擴散片26將該導光板23之出光面232導出 之光束均勻擴散後提供給該液晶顯示面板21。 該擴散片26包括層疊設置之擴散層260及基底層 261。该擴散層260包括一基材262及散佈於其内之複數光 學擴散粒子264，且該光學擴散粒子264部份凸出於該基 材262遠離該基底層261 一側表面，從而使得自該導光板 23射出之光束更好的在凸出於該基材262表面之光學擴散 粒子264部份被擴散。該複數光學擴散粒子264大小一致 且均勻排佈為一層，且相鄰光學擴散粒子264之間距基本 相等’在平面上排佈成一均勻之矩陣。 •該基材261之材質可選用壓克力材質（AcryUc sedes binder) ’其折射率為149。該光學擴散粒子26i之材質為 玻璃’其折射率為19。該基底層261之材質為聚對苯二 甲酸乙_(p〇lyethyiene Terephthalate，PET)或聚碳酸.醋 (Polycarbonate, PC)。 由導光板23射出的光線進入擴散片％後，經擴散層 的擴散處理’可對光線起勻化作用，又由於光學擴散 粒子264的折射率相對遠大於該基材如之折射率，其亦 可對光線起到一定的集光收斂作用。 200921150 請-併參閱圖7，係光線以6Q度進人擴散片％並經 擴散片26處理後之出光輝度圖。其橫座標代表由擴散片 26表面射出之出射光線與該擴散片％表面之法線所成的 擔^ H T考座心代表出光輝度。由圖中可以看出，光線經 書後，其收光角度於32度左右之出光輝度之 數值接近於2700，該栌邱y , 古 擴放片26之光收斂性有了較大的提 局。 ，請-併參_ 8，係背光模組22之光源25射出之 先線經擴散片26勻化虛銘+山，％ + 佈圖之1 分佈圖。該光強分 it "矛出先強度，半徑座標代表由擴散片26 " ，光線與該擴散片26表面之法線所成的角 度。由此圖可以看出妹楯 月 ^^ ^ 1； t 細0,…左右：：了較大的提高’其數值接近 卡^ b 右方向之出射光強度相近，於正向（0产） 均二=強ί不會大幅下降，且整體角度的出光強又度 少增光“使用?=相當的鳩性，因此可以減 相杈於先前技術，該光學擴散粒子264之折射ϋ & 遠大於基材262夕把紅方 L狀诅于“4之折射率相對 # . 折射率，使得該擴散片26除了起到^ 之強度，從而改盖^光：7 作用，提高正向出射光 度，且擴散片267ί、1 2及液晶顯示裝置2之顯示輝 声光片之估 、，二達到相當的光收斂性，因此可以減少 曰先二之使用，降低成本。 月’閱圖9’係本發明液晶顯示裝置第二實施方式之 11 200921150 擴散片之侧面示意圖。該實施方式之擴散片％與第一實施 方式之擴散片26大致相同，其主要區別在於：該擴散層 之光學擴散粒子364均勾排佈為兩層’且光學擴散粒 子3M完全淹埋於該基材中，兩層光學擴散粒子撕對應 排佈。該擴散片之收光角度為2〇度。 請-併參閱圖U)’係背光模組之光源射出之光線經擴 散片36勾化處理後之出光強度分佈圖。由此圖可以看出其200921150 IX. Description of the Invention: [Technical Field] The present invention relates to a prior art diffuser, a backlight module, and a liquid crystal display device. The liquid crystal display panel provides planar light. It is used to make the liquid crystal display. Please refer to the stereo decomposition of the liquid crystal display module 12. Among them, plane light. , Beitong: including the liquid crystal display panel and the liquid crystal display surface moonlight module. The diffuser backlight module uniformly diffuses and emits a light beam emitted from the light source to achieve uniform brightness of the device. 2 and FIG. 1 are a front view of a liquid crystal display device of the prior art. FIG. 2 is a side view of the diffusion sheet of FIG. The backlight module 12 includes a light guide plate 13 , a reflection sheet U , a light source 15 , and a diffusion sheet 16 . The backlight module 12 is provided with the liquid crystal display panel 11 and the backlight. . The light guide plate 13 includes a light incident surface i3i, a light exit surface 132 adjacent to the light incident surface ι31, and a bottom surface 133 opposite to the light exit surface 132. The light source 15 is adjacent to the light incident surface 131 of the light guide plate 13. The reflection sheet 14 is disposed adjacent to the bottom surface 133 of the light guide plate 13. The expansion sheet 16 is disposed adjacent to the light-emitting surface 131 of the light guide plate 13 and is lost between the light guide plate 13 and the liquid crystal display panel 11. The light beam emitted from the light source 15 enters the light guide plate 13 along the light incident surface 131. A part of the light beam is directly led out from the light exit surface 132, and another part of the light beam is emitted from the bottom surface 133 and reflected by the reflective sheet 14 and then The light-emitting surface 132 leads the diffusion sheet 6 to uniformly diffuse the light 6 200921150 which is led out from the light-emitting surface 132 of the light guide plate 13 to the liquid crystal display panel n. The diffusion sheet 16 includes a diffusion layer 16 and a base layer ^1 which are laminated. The diffusion layer 160 includes a substrate 162 and optically diffusing particles 164 dispersed therein, and a portion of the optical diffusion particles 164 protrudes from the surface of the substrate 162 so that the light guide plate 13 is emitted therefrom. The beam is better = two portions of the optically diffusing particles 164 protruding from the surface of the substrate 162 are diffused. The material of the substrate 162 is an acrylic resin (Acrylic Series Resin). The material of the optical diffusion particle 164 is an ink force, that is, the substrate and the refractive index of the optical diffusion particle 164 are close to or equal. Person expansion: See also Figure 3, which is the light luminance diagram of the light entering the diffusion sheet 16 at 60 degrees and processed by the film 16. The abscissa represents the brightness of the emitted light emitted from the surface of the diffuser and the normal line of the surface of the diffuser 16. It can be seen that the light is emitted by the "parallel emission of light near the m=i60 degrees. The number is close to the surface, and after the optical diffusion particle 164 is deflected, the light-receiving angle is produced at % = and the light-emitting luminance is only close to 2 〇〇. The diffusion sheet: the optical convergence material - and referring to FIG. 4, is the backlight module 12 The light intensity distribution map of the light emitted from the light guide plate 13 after passing through the light guide plate 13. The light intensity distribution map 2 = two light output intensity, and the radius coordinate represents the light exit surface 132. ^ = Table:: the normal of the surface m The angle formed by the graph ====degree)_ is weaker, and its value is 2 = 7 200921150. As mentioned above, the light intensity of the light guide plate 13 in the forward direction (twist) is weak, and the number 'value is not greater than 25〇〇, the intensity of the emitted light is greatly reduced compared to the left and right directions, and the light in the left and right direction cannot be effectively converge. The refractive index of the substrate 162 of the diffusion sheet 16 and the optical diffusion particles 164 may be equal or even equal, that is, the general industry. Optical expansion with equal or similar refractive index Particles and substrates have poor light convergence. Therefore, it is often necessary to use a diffuser with a brightness-increasing sheet to guide the light shape. The efficiency of the light-guide sheet is excellent, but the cost is high and the breakage rate is not low. The crease or the dirt is easy to appear, and usually it is necessary to match the upper diffusion sheet for protection, so that the liquid crystal display device 1 is expensive. [Invention] In view of this, it is possible to improve the forward light intensity. The diffusion sheet is necessary. It is also necessary to provide a backlight module using the above diffusion sheet. It is also necessary to provide a liquid crystal display device using the above backlight module. A diffusion sheet comprising a diffusion layer. The diffusion layer includes a substrate and an optical diffusion particle dispersed in the substrate, and the ratio of the refractive index of the optical diffusion particle to the refractive index of the substrate is greater than or equal to 1.2. A backlight module includes a light source and a diffusion sheet for receiving light emitted by the light source, the diffusion sheet comprising a diffusion layer, the diffusion layer comprising a substrate and optical diffusion particles dispersed in the substrate The ratio of the refractive index of the optically diffusing particles to the refractive index of the substrate is greater than or equal to 1.2. A liquid crystal display device comprising a liquid crystal display panel and a backlight module disposed adjacent to the 8 200921150 liquid crystal panel The emitted light group includes a light source and a nine-wire diffusion sheet, the diffusion sheet includes a diffusion layer, and the diffusion layer includes a substrate and optical diffusion particles dispersed in the substrate. The refractive index of the optically diffusing particles is more than 丄2, and the ratio of the refractive index of the material to the substrate is greater than or equal to the frequency of the diffusion sheet, the backlight module and the liquid crystal expansion layer of the present invention. The ratio of the refractive index of the optically diffusing particles to the substrate is greater than that of the substrate. The refractive index of the optically diffusing particles is greater than the refractive index of the substrate, so that the diffusion sheet is based on the sentenced light. The convergence of the light, the positive light output intensity of the light is increased, and the display of the moonlight module and the liquid crystal display device is improved. [Embodiment] Referring to FIG. 5 and FIG. 6, the fifth embodiment of the present invention is the liquid crystal display device. An exploded perspective view of the embodiment, and Fig. 6 is a side view of the diffuser. The liquid crystal display device 2 includes a liquid crystal display panel 21 and a backlight module 22 adjacent to the liquid crystal display panel 21. The backlight module 22 provides planar light to the liquid crystal display panel 21, which is an edge-lit backlight module. The backlight module 22 includes a light guide plate 23, a reflection sheet %, a light source 25, and a diffusion sheet 26. The light guide plate 23 includes a light exit surface 232, a bottom surface 233 opposite to the light exit surface 232, and a light incident surface 231 intersecting the bottom surface 233 and the light exit surface 232. The light source 25 is disposed adjacent to the light incident surface 231 of the light guide plate 23. The reflection sheet 24 is disposed adjacent to the bottom surface 233 of the light guide plate 23. The diffusion sheet 26 is disposed adjacent to the light-emitting surface 232 of the light guide plate 23, and is between the liquid crystal display panel 21 and the light guide plate 23. The light source 25 is a 9 200921150 Cold Cathode Fluorescent Lamp (CCFL). A light beam emitted from the light source 25 enters the light guide plate 23 along the light incident surface 231. A part of the light beam is directly led out from the light exit surface 231, and another portion of the light beam is emitted from the bottom surface 232 and reflected by the reflective sheet 24, and then The light exit surface 232 is derived. The diffuser 26 uniformly diffuses the light beam which is led out from the light exit surface 232 of the light guide plate 23, and supplies the light beam to the liquid crystal display panel 21. The diffusion sheet 26 includes a diffusion layer 260 and a base layer 261 which are laminated. The diffusion layer 260 includes a substrate 262 and a plurality of optical diffusion particles 264 interposed therein, and the optical diffusion particles 264 protrude from the surface of the substrate 262 away from the substrate 261, thereby The light beam emitted from the light plate 23 is better diffused in portions of the optical diffusion particles 264 protruding from the surface of the substrate 262. The plurality of optically diffusing particles 264 are uniform in size and uniformly arranged in a layer, and the adjacent optically diffusing particles 264 are substantially equal in height and arranged in a plane on a uniform matrix. • The material of the substrate 261 may be made of an acrylic material (AcryUc sedes binder) having a refractive index of 149. The material of the optical diffusion particle 26i is glass, and its refractive index is 19. The base layer 261 is made of polyethylene terephthalate (PET) or polycarbonate (PC). After the light emitted from the light guide plate 23 enters the diffusion sheet, the diffusion treatment of the diffusion layer can be used to homogenize the light, and since the refractive index of the optical diffusion particle 264 is relatively larger than the refractive index of the substrate, It can play a certain concentration convergence effect on light. 200921150 Please - and refer to Fig. 7, is the light luminance diagram of the light entering the diffuser at 6Q and processed by the diffuser 26. The abscissa represents the luminance of the light emitted from the surface of the diffuser 26 and the normal of the surface of the diffuser. It can be seen from the figure that after the light passes through the book, the light-emitting brightness of the light-receiving angle of about 32 degrees is close to 2700. The convergence of the light of the Qiu y and the ancient expanded piece 26 has a great advantage. , please - and _ 8, the light source 25 of the backlight module 22 is emitted from the first line through the diffuser 26 to homogenize the virtual Ming + mountain, % + layout 1 distribution map. The intensity of the light is divided into the intensity of the spear, and the radius coordinate represents the angle formed by the diffuser 26 ", the normal of the light and the surface of the diffuser 26. From this figure, we can see that the sister month ^^ ^ 1; t fine 0, ... left and right:: a large increase 'the value is close to the card ^ b right direction of the outgoing light intensity is similar, in the positive (0 production) Two = strong ί will not drop significantly, and the overall angle of light output is less lightening "use? = considerable ambiguity, so it can be reduced compared to the prior art, the refractive index of the optical diffusion particle 264 is much larger than the base The material 262 把 红 红 红 红 红 红 “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ “ The films 267 ί, 1 2 and the liquid crystal display device 2 display the illuminating light sheet, and the second one achieves a considerable light convergence, so that the use of the second erroneous film can be reduced, and the cost can be reduced. Fig. 9 is a side view showing a diffusion sheet of the second embodiment of the liquid crystal display device of the present invention. The diffusion sheet % of this embodiment is substantially the same as the diffusion sheet 26 of the first embodiment, and the main difference is that the optical diffusion particles 364 of the diffusion layer are both arranged in two layers 'and the optical diffusion particles 3M are completely submerged in the base In the material, two layers of optical diffusion particles are torn to the corresponding arrangement. The diffusing angle of the diffuser is 2 degrees. Please refer to Figure U) for the light intensity distribution of the light emitted from the light source of the backlight module through the diffusion sheet 36. This figure shows that it
出光強度在正向（0度）方向之出射光之強度進一步有所提 南，光收敛性更佳。 明參閱圖11 ’係本發明液晶顯示裝置第三實施方式之 擴散片之側面示意圖。該實施方式之擴散片46與第一實施 方式之擴散片26大致相同，其主要區別在於：該光學擴散 粒子464在基材462中呈兩層排列，該兩層先學擴散粒子 464間隔交叉設置，該光學擴散粒子464完全淹埋於該基 材462中，該基材462之折射率為149，該光學擴散粒子 464之折射率為2.2。 惟，本發明並不限於上述實施方式所述，例如：光學 擴散粒子之折射率與基材之折射率的比值在12以上即可 起到一疋的集光作用並提高正向出射光之強度，其不限於 上述實施方式所列舉之數值；該複數光學擴散粒子之顆粒 大小及折射率可以不相同；該複數光學擴散粒子係雜亂散 佈於該擴散層之基材中，並非一定層層排列；該背光模組 亦可為直下式背光模組；擴散片之基材材質可選用壓克力 材質’透光聚合物（p〇lymer)材質，如聚碳酸酯等等，只要 12 200921150 :=t粒子均勻混合即可；該基材之折射率η選用 . 該光轉散粒子可選用玻璃材 尚折射率有機粒子，其折射率為 丄过者"他 子在基材⑴層排列，並非—定為2:2二光學擴散粒 粒子呈多芦排列日士 ia . L 為或一層；光學擴散 夕層排列恰，相郇層上之光學擴散粒子 置，亦可間隔交叉排列。 對應权 綜上所述，本發明確已符合發明專利之要 ，出專射請。惟，以上所述者僅為本發明之較佳實^方 ，，本發明之範圍並不以上述實施例為限，該舉凡二枣 案技藝之人士援依本發明之精神所作 ^' 皆應涵蓋於以下申請專利範圍内。寺机飾或變化’ 【圖式簡單說明】 圖1係一種先前技術液晶顯示裝置之立體分解圖。 圖2係圖1所示擴散片之側面示意圖。 θ 圖3係光線以6G度進人圖丄所示之擴散片並經該擴散片 處理後之出光輝度圖。 圖4係圖i所示導光板之出光強度分佈圖。 圖5係本發明液晶顯示裝置第一實施方式之立體分解圖。 圖6係圖4所示擴散片之側面示意圖。 圖7係光線卩6〇度進入圖4所示之擴散片並經擴散片處 理後之出光輝度圖。 圖8係圖5所示之背光模組之光源射出之光線經擴散片 勻化處理後之出光強度分佈圖。 圖9係本發明液晶顯示裝置第二實施方式之擴散片之侧 13 200921150 面示意圖。 • 圖10係圖9所示之背光模組之光源射出之光線經擴散片 . 勻化處理後之出光強度分佈圖。 圖11係本發明液晶顯示裝置第三實施方式之擴散片之侧 面示意圖。 【主要元件符號說明】 液晶顯不裝置 2 液晶面板 21 背光模組 22 導光板 23 入光面 231 出光面 232 底面 233 反射片 24 光源 25 擴散片 26 、 36 、 46 擴散層 260 > 360 基底層 261 基材 262 、 462 光學擴散粒子 264 、 364 14The intensity of the outgoing light in the forward (0 degree) direction is further enhanced, and the light convergence is better. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 11 is a side view showing a diffusion sheet of a third embodiment of the liquid crystal display device of the present invention. The diffusion sheet 46 of this embodiment is substantially the same as the diffusion sheet 26 of the first embodiment, and the main difference is that the optical diffusion particles 464 are arranged in two layers in the substrate 462, and the two layers of the precursor diffusion particles 464 are arranged at intervals. The optical diffusion particles 464 are completely buried in the substrate 462. The refractive index of the substrate 462 is 149, and the refractive index of the optical diffusion particles 464 is 2.2. However, the present invention is not limited to the above embodiments. For example, the ratio of the refractive index of the optically diffusing particles to the refractive index of the substrate is 12 or more, thereby providing a light collecting effect and increasing the intensity of the forward outgoing light. The plurality of optically diffusing particles may be different in particle size and refractive index; The backlight module can also be a direct-lit backlight module; the substrate material of the diffusion sheet can be made of acrylic material, such as a transparent polymer material, such as polycarbonate, etc., as long as 12 200921150 :=t particles Uniform mixing can be used; the refractive index η of the substrate is selected. The light-dispersing particles can be selected from glass-based refractive index organic particles, and the refractive index is 丄 丄 & 他 他 他 他 他 他 他 他 他 他 他 他 他 他 他 他 他 他 他 他 他 他 他 他The 2:2 two-optical diffusing particles are arranged in a multi-reed arrangement, and the optical diffusing layer is arranged, and the optical diffusing particles on the opposite layer are arranged, and may be arranged at intervals. Correspondence rights In summary, the present invention has indeed met the requirements of the invention patent, and has a special shot. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and the person skilled in the art of the two methods should be based on the spirit of the present invention. It is covered by the following patent application. Temple Machine Decoration or Variation ' [Simple Description of the Drawings] FIG. 1 is an exploded perspective view of a prior art liquid crystal display device. Figure 2 is a side elevational view of the diffuser of Figure 1. θ Fig. 3 is a light luminance diagram of the diffusing film shown in Fig. 光线 at 6G and processed by the diffusing film. Figure 4 is a diagram showing the distribution of light intensity of the light guide plate shown in Figure i. Fig. 5 is an exploded perspective view showing the first embodiment of the liquid crystal display device of the present invention. Figure 6 is a side elevational view of the diffuser of Figure 4. Fig. 7 is a light luminance diagram after the light ray 6 is entered into the diffusion sheet shown in Fig. 4 and processed by the diffusion sheet. FIG. 8 is a diagram showing the distribution of light intensity after the light emitted from the light source of the backlight module shown in FIG. 5 is homogenized by the diffusion sheet. Fig. 9 is a side view showing the side of the diffusion sheet of the second embodiment of the liquid crystal display device of the present invention. • Figure 10 is a diagram showing the light intensity distribution of the light emitted from the light source of the backlight module shown in Fig. 9 through the diffusion sheet. Figure 11 is a side view showing a diffusion sheet of a third embodiment of the liquid crystal display device of the present invention. [Main component symbol description] LCD display device 2 Liquid crystal panel 21 Backlight module 22 Light guide plate 23 Light-incident surface 231 Light-emitting surface 232 Bottom surface 233 Reflecting sheet 24 Light source 25 Diffusion sheet 26, 36, 46 Diffusion layer 260 > 360 Base layer 261 substrate 262, 462 optical diffusion particles 264, 364 14