201028741 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種光擴散元件以及背光模組，尤指利用 於背光模組中之光擴散元件。 【先前技術】 月光模組廣泛的被利用以作為各式平面顯示器所需之光 ❹ 源’為顯示產業中的重要光源模組。背光模組為使所照射之 光線能均勻發散，會利用如擴散板之光擴散元件來輔助光線 均勻照射；為使光線能更充分的均勻照射，不少著墨於光擴 散元件的技術因應而生。 、 請參閱第一圖’第一圖係習知技術光擴散元件丨丨之第一 例示意圖。在背光模組10中如擴散片之光擴散元件Η，於 習知技術巾，已經有在翻基板16之上表面設置光擴散微結 構14的技術’如圖所*，由基板16上設μ數個微小的半 ❹ 球體，光擴散元件11的下方衫個光源裝置12，由於多個 光源裳置12關距使得光線L並不均勻，因此顧光擴散元 件11可使光線L達到均勻化的功效。 然而’此光擴散微結構14均勻化的效果有限，且半球體 又難製造’因此’進而有改良的技術因應而生。 一明參閱第一圖，第二圖係習知技術光擴散元件2〇之第二 例示意圖。為使光線均勻化的效果更佳，f知技術有採用不 規則狀成型光擴散微結構24的技術，藉由基板26上不 幾何形狀的光擴散微結構24，來達成更佳光線均勻化的效 201028741 果。 t，此雜術雖錢果得以改善使絲更加均句化， ==微結構24係隨機成型，每-個光擴散元件2〇 H 規格化的控制。所以，應該要有更具體 的規範來軸光擴散元件2G，技能符合商品⑽需求、體 u 進步改善第—®例之結構，於光擴散微結構201028741 VI. Description of the Invention: [Technical Field] The present invention relates to a light diffusing element and a backlight module, and more particularly to a light diffusing element used in a backlight module. [Prior Art] The moonlight module is widely used as an optical source for various flat panel displays as an important light source module in the display industry. The backlight module is configured to make the irradiated light uniformly disperse, and utilizes a light diffusing element such as a diffusing plate to assist the uniform illumination of the light; in order to make the light more uniformly and uniformly irradiated, a lot of ink is applied to the technology of the light diffusing element. . Please refer to the first figure. The first figure is a schematic diagram of the first example of a conventional light diffusing element. In the backlight module 10, such as a light diffusing element of a diffusion sheet, in the prior art towel, there has been a technique of providing a light diffusing microstructure 14 on the upper surface of the flip substrate 16 as shown in the figure. a plurality of tiny semi-circular spheres, a light source device 12 under the light diffusing element 11, and the light source L is uniform because the plurality of light sources are disposed at a distance of 12 so that the light L is not uniform. efficacy. However, the effect of homogenizing the light-diffusing microstructure 14 is limited, and the hemisphere is difficult to manufacture. Therefore, an improved technique is produced. Referring to the first figure, the second figure is a schematic diagram of a second example of a conventional light diffusing element. In order to achieve better uniformity of light, the technique of irregularly shaping the light-diffusing microstructures 24 is achieved by using a non-geometric light-diffusing microstructure 24 on the substrate 26 to achieve better light uniformity. Effect 201028741 results. t, although the money is improved, the silk is more uniform, == microstructure 24 is randomly formed, and each light diffusing element is controlled by 2 〇 H normalization. Therefore, there should be a more specific specification for the axial light diffusing element 2G, the skill meets the requirements of the commodity (10), the body u progresses and improves the structure of the first example, in the light diffusion microstructure
鸯―、杜η雜又^多個次結構（圖中未示），如此，所產出光擴 月：一因:人結構數量不-致而仍有差異化，但是差異化 白、巾田度已、、趾第—_之光擴散元件2Q為紐，對於出薇的 品質更能規格化。然而，此種結構的製造更為麻煩，良率低， 大幅增添了製造成本。 - 因此，本發明的主要目的在於提供一種背光模組以及利 用於月光模組中之光擴散元件，以改善上述問題。 【發明内容】 本發明之目的在提供—㈣光模組以及_於背光模組 中之光擴散元件’能以簡易的結構，就能制理想的光線均 勻效果，便於商業製造。 本發明係關於一種背光模組以及利用於背光模組中之光 擴散元件，背光模組主要包含一光源裝置、以及一光擴散元 件。該光源裝置設置於該光擴散元件下方，係用以產生光線 向上進入該光擴散元件中。 光擴散元件進一步包含一基板、以及複數個光擴散微結 構。該基板係鄰近該光源裝置設置。 4 201028741 ⑺該等光擴散微結構係設置於該基板之上表面，該光擴散 微結構係包含-側牆面以及—頂導光面。其巾細牆面與該 基板之夾角係於40度至60度之範圍，該頂導光面係為一弧 面’該弧面之弧半徑係於G. G1毫米㈣至G. 3毫米（晒)之範 圍。 一其中，來自該光源裝置之光線係透過該基板以導入該等 #鸯 ― 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 The degree 2, the toe first - _ light diffusing element 2Q is New Zealand, and the quality of the wei is more standardized. However, the construction of such a structure is more troublesome, the yield is low, and the manufacturing cost is greatly increased. - Accordingly, it is a primary object of the present invention to provide a backlight module and a light diffusing element for use in a moonlight module to improve the above problems. SUMMARY OF THE INVENTION The object of the present invention is to provide a (four) optical module and a light diffusing element in the backlight module, which can achieve an ideal light uniformity effect and is convenient for commercial manufacture with a simple structure. The invention relates to a backlight module and a light diffusing element used in the backlight module. The backlight module mainly comprises a light source device and a light diffusing element. The light source device is disposed under the light diffusing element for generating light upwardly into the light diffusing element. The light diffusing element further includes a substrate and a plurality of light diffusing microstructures. The substrate is disposed adjacent to the light source device. 4 201028741 (7) The light diffusing microstructures are disposed on an upper surface of the substrate, and the light diffusing microstructure comprises a side wall surface and a top light guiding surface. The angle between the thin wall surface of the towel and the substrate is in the range of 40 to 60 degrees, and the top light guiding surface is a curved surface. The arc radius of the curved surface is G. G1 mm (four) to G. 3 mm ( The range of sun). One of the light from the light source device passes through the substrate to introduce the light
光擴散微結構，並魏鮮紐散微賴向均句導出該光 擴散元件。 ^ “因此，藉由本發明之背光模組以及利用於背光模|且中之 f廣散元件，姻光擴散微結構之側牆面與頂導光面分別於 角40度至60度以及弧半徑於〇 〇1毫米至〇 3毫米之範圍 的限制，能以簡單胁製造的結構，就能達到理想的光線均 勻效果’便於商業上的利用。 、 關於本發明之優點與精神可以藉由以下的發明詳 附圖式得到進一步的瞭解。 實施方式】 土 π參閱第三圖，第三圖係本發明平面顯示_ 6〇之側向示 厂圖。本發明係關於—種背光模組3()、4()以及利用於背光模 ^ 3〇 4G巾之光擴散元件3卜可利驗平面顯示器6〇中。 楔Si)之t面顯示_具有可作為光源來產生光机的背光 〜且30、40，以及可以產生影像的顯示面板5〇。 为光模組3G、4G設於顯示面板5〇下方，此f光模組3〇、 可為-種直下式背賴組，係透過_散元件31向上產 5 201028741 生均句的光線L來穿透顯示面板5〇，顯示面板5〇會產生影 像，光線L使此影像向上投射’使外部可目視及辨認此影像。 明參閱第四圖，第四圖係本發明背光模組30之侧面示意 圖。背光模組30主要包含一光源裝£ 32、以及一光擴散元 件31圖中有六個光源褒置32，可為發光二極體⑽^或是 冷陰極燈管(CCFL)皆可，並列設置於光紐元件31之基板 ^下方係用以產生不均勻的光線[，向上進入光擴散元件 31中。 光擴散元件31進一步包含一基板36、以及複數個光擴 放微結構34。絲36 _近光稀£ 32設置，該等光擴散 微結構34係設置於基板36之上表面。其中，來自光源裝置 32之^線L原本是不均勻照射的，但後續透過基板洲以、導 ^該等綠散微結構34，並透過鱗光擴散微結構34能向 上均勻的導出光擴散元件31。 φ 四圖進—步參閱第五圖’第五關本發明光擴散 構34之側面示意圖。針對光擴散微結構抑加以說明， 修=圖來看，光擴散微結構34係包含一側牆面屬以 頂導光面其係由侧牆面魏立於基板36之 上表面，且頂導光面34〇2覆蓋於側牆面3卿之上。 側龄Stmt發明光擴散微結構34可為如_五所示包含兩 稱=播以及一頂導光面3402 ’此兩側牆面3406互為對 °構，而頂導光面3搬覆蓋於兩側牆面之上。 線面剖示來看’侧牆面3406係可為如第四圖所示之直 線，其中側牆面3406與基板36之夾角Θ係於40度至60度 201028741 之麵。再=側面剖示來看，頂導光面續係為 --弧面，弧 :為〇點’該弧面之弧半徑R係介於Q. Ql毫米（刪)至〇· 3 宅米（麵)之範圍。 在此範_定義下，能佳的光擴散效果 ;其中頂導光 面3402的弧半獲R與側牆面34〇6的爽角0有緊密的關係。 在相同的投影面積限制之下，弧半徑，爽角0就得命 大’但夾角以過了 60度之後，光線L的照射均句度會不 φ 5瓜半徑R愈小，夾角0就隨之愈小，但夾角Θ小過了 40度之 後，光線L的照射均勻度亦會不佳。 配合多種不同光源裝置32間距、光源裝置32直徑 源裝置32與光擴散元件31距離、光源褒置犯混光高度、光 擴散元件材質的試驗後，在針對此結構反覆試驗，得到夹 角Θ於40度至60度以及弧半徑R於〇, 〇1毫米(麵)至〇· 3 毫米（mm)之最佳範圍。 請參閱第六圖，第六圖係本發明背光模組4〇之另一例示 ❹ _ ° _細圖之實關’同樣有產生光線L的光源裝置 42 ’也同财包含基板46與光擴散·構“的光擴散元件 41 ’並且光擴散微結構44的結構與第五圖所述之光擴散微結 構34相同；第六圖實施例基板46之上表面具有至少一平坦 區48 ’而此平坦區48係位於相鄰的兩光擴散微結構44間: 如前述，雖紐半徑R與夾角Θ有緊密_係，但是於 顯示效果來看，若底下光源裝置32的間隔過大時，於光源裝 置32的間隔之間的投射影像’仍會出現暗區，影響晝面的品 質。此時，在每兩個光擴散微結構44間都設置一個平坦區 7 201028741 48，則會使暗區增亮，達到更佳的光線l均勾化效果。 實驗的效果請參閱第七A圖、第七B圖、以及第七c圖， 七A圖係非本發明光擴散元件之擴散效果示意圖。第七B 圖，…弧半m守夾角51在本發明範圍内與範圍外比較之實 驗^果7]^®。第七C圖係夾角0在本發明範圍内時變動弧 半lr於本發鴨_與範圍外比較之實驗效果示意圖。 第七A圖例係不設置類似本發明之光擴散微結構形狀， ❹ 财的圈圈為光源裝置32 ’縱軸為亮度，橫軸為位置，實施 狀況為在42吋的背光模組3〇中並排設置十根冷陰極燈管 (CCFL)作為光源裝置32 ’圖表為背^模組30上方正視30度 角内的集光效果。冷陰極燈管上方因為沒有光擴散微結構 34 ’所以亮度顯得特別高，但整體均勻度非常差，目視效果 即為棚棚狀之顯示態。 /第七B圖之圖例中，縱軸為亮度，橫軸為位置，部份曲 線係採用本發明範圍内之夾角Θ，暫時弧半徑R皆以〇來比 ❹ 對；由圖中可知，夾角0於40度至60度範圍内之夾角Θ已 有明顯的均勻度改善，炎角Θ為3〇度以及7〇度之曲線，均 勻度皆很不理想。 第七C圖之圖例中，縱軸為亮度，橫軸為位置，失角0 皆為40度而為本發明之範圍内，部份曲線係採用本發明範圍 内之弧半徑R ;由第七B圖可見，在調整夾角0的過程中， 冷陰極燈管正上方之亮度會因失角0的關係，而有向中心降 低而呈現Μ型亮度分佈的狀況，對於視覺感受來說，仍屬_ 種瑕疲。 8 201028741 因此，為解決Μ型亮度分佈的問題，補強冷陰極燈管上 方的亮度，又不致於影響冷陰極燈管間的亮度太多，利用弧 半徑R去進行調整，可以有效的消除Μ型亮度分佈的現象。 如圖例中’弧半控R為〇. lmm時，均勻度較弧半徑r為〇刪 時為佳，而弧半徑R為0. 15mm時的均勻度效果又更好了。然 而，弧半徑R調整也會影響到均勻度，故弧半徑R與夾角0 的搭配與協同調整是極為重要的。The light diffuses the microstructure, and the light diffusing element is derived from Wei Xianxin's micro-distribution. ^ "Therefore, with the backlight module of the present invention and the use of the backlight module|and the f-dispersion element in the backlight mode, the side wall surface and the top light guiding surface of the marriage light diffusion microstructure are respectively at an angle of 40 to 60 degrees and an arc radius. With the limitation of the range of 1 mm to 3 mm, the structure can be manufactured with a simple threat, and the desired light uniformity effect can be achieved'. It is convenient for commercial use. The advantages and spirit of the present invention can be obtained by the following The invention is further described in the following drawings. Embodiments: soil π refers to the third diagram, and the third diagram is a side view of the plane display _ 6 本 of the present invention. The present invention relates to a backlight module 3 () 4() and the light diffusing element 3 used in the backlight module 3 〇 4G towel can be used in the flat display 6 。. The t-side display of the wedge Si) has a backlight capable of generating a light machine as a light source~30 40, and a display panel 5 可以 which can generate an image. The optical modules 3G and 4G are disposed under the display panel 5〇, and the f-light module 3〇 can be a direct-type group. Component 31 is produced upwards 5 201028741 The average light of the sentence L penetrates the display panel 5〇, the display panel 5〇 will produce an image, and the light L causes the image to be projected upwards. The external image can be visually recognized and recognized. Referring to the fourth figure, the fourth figure is a schematic side view of the backlight module 30 of the present invention. The group 30 mainly comprises a light source device 32 and a light diffusing element 31. There are six light source devices 32 in the figure, which can be either a light emitting diode (10) or a cold cathode fluorescent tube (CCFL), and are arranged side by side in the light. The substrate of the button 31 is used to generate uneven light [toward the light diffusing element 31. The light diffusing element 31 further includes a substrate 36 and a plurality of light-expanding microstructures 34. The light diffusing microstructures 34 are disposed on the upper surface of the substrate 36. The line L from the light source device 32 is originally unevenly irradiated, but subsequently passes through the substrate to guide the green The light diffusion element 31 can be uniformly distributed upward through the smear micro-structure 34. The φ four-figure step-by-step refers to the fifth diagram of the fifth aspect of the light diffusion structure 34 of the present invention. Microstructures, In the figure, the light-diffusing microstructure 34 includes a side wall surface with a top light guiding surface, which is supported by the side wall surface on the upper surface of the substrate 36, and the top light guiding surface 34〇2 covers the side wall surface. Above the Qing. The lateral-age Stmt invention light diffusing microstructure 34 can be as shown in _5, including two scales = broadcast and a top light guide surface 3402 'the two sides of the wall surface 3406 are opposite each other, and the top light guide The surface 3 is covered on both sides of the wall surface. The line surface section shows that the side wall surface 3406 can be a straight line as shown in the fourth figure, wherein the angle between the side wall surface 3406 and the substrate 36 is 40 degrees. To the surface of 60 degrees 201028741. Then, the side guide shows that the top light guide is continuous - the arc surface, the arc: the 〇 point 'the arc radius of the arc R is between Q. Ql mm (deleted) To 〇· 3 The range of house rice (face). Under the definition of this model, a good light diffusion effect can be achieved; wherein the arc half of the top light guide surface 3402 is closely related to the refresh angle 0 of the side wall surface 34〇6. Under the same projection area limit, the radius of the arc, the refresh angle of 0 will have a large life. 'But after the angle is over 60 degrees, the illumination of the light L will not be φ. The smaller the radius R, the angle 0 will follow. The smaller the angle, but after the angle is less than 40 degrees, the uniformity of the illumination of the light L will also be poor. With the different distances of the different light source devices 32, the distance between the source device 32 and the light diffusing element 31 of the light source device 32, the height of the light source, and the material of the light diffusing element, the test is repeated for the structure, and the angle is obtained. 40 to 60 degrees and the arc radius R is in the range of 〇1 mm (face) to 〇·3 mm (mm). Please refer to the sixth figure. The sixth figure is another example of the backlight module 4 of the present invention. The light source device 42 that also generates the light L also has the substrate 46 and the light diffusion. The structure of the light diffusing element 41' and the structure of the light diffusing microstructure 44 are the same as those of the light diffusing microstructure 34 of the fifth figure; the upper surface of the substrate 46 of the sixth embodiment has at least one flat region 48' The flat region 48 is located between the adjacent two light diffusing microstructures 44. As described above, although the radius R and the angle Θ are closely related, in view of the display effect, if the interval between the bottom light source devices 32 is too large, the light source The projected image between the intervals of the device 32 will still have dark areas, which affect the quality of the face. At this time, a flat zone 7 201028741 48 is provided between each of the two light diffusing microstructures 44, which will increase the dark area. Bright, to achieve better light l. The effect of the experiment, please refer to the seventh A picture, the seventh B picture, and the seventh c picture, the seventh A picture is not a diffusion effect of the light diffusion element of the present invention. Seven B diagram, ... arc half m guard angle 51 within the scope of the present invention Experiments outside the range of the results of the fruit ^ 7 ^ ^. The seventh C picture of the angle of the angle 0 within the scope of the present invention, the variation of the arc half lr in the hair duck _ compared with the scope of the experimental effect diagram. The seventh A diagram is not set Similar to the light-diffusing microstructure shape of the present invention, the circle of the money is the light source device 32. The vertical axis is the brightness, and the horizontal axis is the position. The implementation condition is that ten cold cathode lamps are arranged side by side in the 42-inch backlight module 3〇. The tube (CCFL) is used as the light source device 32'. The graph shows the light collecting effect in the 30-degree angle above the module 30. The upper part of the cold cathode tube has no light diffusing microstructure 34', so the brightness is particularly high, but the whole is uniform. The degree is very poor, and the visual effect is the display state of the shed. / In the legend of the seventh picture B, the vertical axis is the brightness, the horizontal axis is the position, and the partial curve is the angle Θ within the scope of the invention, the temporary arc radius R is better than 〇; as can be seen from the figure, the angle Θ between the angles of 40 degrees and 60 degrees has a significant uniformity improvement, and the angle of 炎 is 3 degrees and 7 degrees, evenly The degree is very unsatisfactory. In the legend of the seventh C diagram, the vertical axis is brightness. The horizontal axis is the position, and the angle of loss 0 is 40 degrees, which is within the scope of the invention. The partial curve adopts the arc radius R within the scope of the invention; as can be seen from the seventh B chart, during the adjustment of the angle 0, the cold The brightness above the cathode tube is due to the relationship of the angle of loss 0, and the direction of the center is lowered to exhibit a Μ-type brightness distribution. For the visual experience, it is still a kind of fatigue. 8 201028741 Therefore, in order to solve the problem type The problem of brightness distribution, the brightness above the cold cathode lamp tube is not affected, and the brightness between the cold cathode lamps is not too much, and the arc radius R is used for adjustment, which can effectively eliminate the phenomenon of the brightness distribution of the Μ type. The arc semi-control R is 〇. lmm, the uniformity is better than the arc radius r is 〇, and the arc radius R is 0. 15mm, the uniformity effect is better. However, the arc radius R adjustment also affects the uniformity, so the matching and coordinated adjustment of the arc radius R and the angle 0 is extremely important.
以下補充說明部份，亦為本發明重要特徵，而由於文字 說明已可清楚表達其侧特徵、作料，因此，直接以文字 說明，並無特別標號於圖示之中。補充說明的是，本發明光 擴散7G件中亦可含有多個透明且折射率不同的擴散粒子 光擴散元叙絲含有紐粒子，或光擴散元件之光擴 散微結構含有錄好，或光紐元件之基板及光擴散微社 構同時含麵錄子），如此’更可鋪倾果提昇。此外。， =擴散微結構的表面除了為光滑表面之外，也能採用粗糖表 ϋ光擴散微結構之侧牆面可為平滑面、粗糖面或同時且 ί平f面雜細，或光擴散赌構之科光面可為平滑八 =链喊科财平滑面及粗触），如此 線均勻擴散的效果。 月味歼尤 坦區:擴散微結構間之基板之上表面可為前述平 型態_構或前述多種不同 了前、f沾1再補充5兒月的疋’光擴散微結構34之側牆面除 /之曲面、.、0構）或别述多種不同型態之組合。 201028741 因此，藉由本發明之背光模組30、40以及利用於背光模 組30、40中之光擴散元件31、41，利用光擴散微結構34、、 44之側牆面3406與頂導光面3402分別於夾角<9自40度至 =度，以及弧半徑以請毫米至Q 3毫米之範圍的限制， 此以簡單易於製造的結構，就能達到理想的光線[均句效 果’便於商業上的利用。 、藉由以上較佳具體貫施例之詳述，係希望能更加清楚描The following supplementary descriptions are also important features of the present invention, and since the side features and the materials are clearly expressed in the text description, they are directly indicated by the characters and are not specifically labeled. In addition, the light diffusing 7G device of the present invention may also contain a plurality of transparent diffusing particles having different refractive indices, and the light diffusing microstructures of the light diffusing elements may be recorded, or the light The substrate of the component and the light-diffusing micro-construction also contain the surface record), so that it can be improved. Also. , = In addition to the smooth surface of the diffused microstructure, the side wall surface of the fine-grain diffusion microstructure can be smooth surface, coarse sugar surface or simultaneous and smooth, or light diffusion The smooth surface of the branch can be smooth eight = chain shouting smooth surface and rough touch), so the line spreads evenly. The moon 歼 歼 坦 区 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : Face division / surface, ., 0 structure) or a combination of many different types. 201028741 Therefore, by using the backlight modules 30 and 40 of the present invention and the light diffusing elements 31 and 41 used in the backlight modules 30 and 40, the side wall surface 3406 and the top light guiding surface of the light diffusing microstructures 34 and 44 are utilized. 3402 is at an angle of <9 from 40 degrees to = degrees, and the radius of the arc is limited to the range of mm to Q 3 mm. This makes it possible to achieve ideal light with a simple and easy-to-manufacture structure. Use on. With the above detailed description of the specific embodiments, it is hoped that the description will be more clearly described.
述本發明之舰無神，而並相上稍減雜佳具體實 施例來對本發明之範,加以關。相反地，其目的是希望能 涵蓋各種改變及具相的賴於本發衡欲 圍的範疇内。 祀 【圖式簡單說明】 第-圖貧習知技術光擴散元件之第一例示意圖 第二圖係習知技術光擴散元件之第二例示意圖 第二圖係本發明平面顯示器之側向示意圖； 第四圖係本發明背光模組之側面示意圖； 第五圖係本發明光擴散微結構之側面示意圖； 第六圖係本發明背光模組之另—例示意圖； 第七4圖係非本發明光擴散元件之擴散效果示意圖； 外咐翻細内與範圍 第七(：圖係伽在本發明她_弧抱於本 201028741 發明範圍内與範圍外比較之實驗效果示意圖。 【主要元件符號說明】 60 :平面顯示器 30、40 :背光模組 30 :背光模組 31 :光擴散元件 34 :光擴散微結構 3402 :頂導光面 R :弧半徑 42 :光源裝置 46 :基板 48 .平坦區 50 :顯示面板 L :光線 32 :光源裝置 36 :基板 3406 :側牆面 Θ .夾角 40 :背光模組 41 :光擴散元件 44 :光擴散微結構 參 11The ship of the present invention is devoid of the gods, and the specific embodiment is slightly reduced to align the invention. On the contrary, its purpose is to cover a wide range of changes and aspects that depend on the scope of this balance.祀 [schematic description of the drawings] first diagram of the first example of the light diffusion element of the poor technology, the second diagram of the second example of the prior art light diffusion element, the second diagram is a side view of the flat panel display of the present invention; The fourth drawing is a schematic side view of the backlight module of the present invention; the fifth drawing is a side view of the light diffusing microstructure of the present invention; the sixth drawing is another schematic view of the backlight module of the present invention; Schematic diagram of the diffusion effect of the light diffusing element; the outer radius and the range of the seventh (the figure is gamma in the invention. The _ arc is in the scope of the invention and the experimental results of the comparison outside the scope. [Main component symbol description] 60: flat display 30, 40: backlight module 30: backlight module 31: light diffusing element 34: light diffusing microstructure 3402: top light guiding surface R: arc radius 42: light source device 46: substrate 48. flat region 50: Display panel L: light 32: light source device 36: substrate 3406: side wall surface 夹 angle 40: backlight module 41: light diffusing element 44: light diffusing microstructure reference 11