M326171 ' 八、新型說明： 【新型所屬之技術領域】 本創作係-種光學擴散片之構造，其係有關於光學的領域中，可 以讓光均勻化之擴散片，_涉及—_含厚度變化之散射層結構的 擴散片，得以使光均勻化。 、【先前技術】 ，一般液晶顯示11係依照實際設計之需求而選擇_直下式或者是 側光式的背光模組架構，·若為側光式背光模組架構，其主要係利用導 光板之圖案(網點或v型溝槽)及擴散膜片切），以達到光均 勻擴散之效果；若為直下式背光模組架構，則主要於光源上方放置一 擴散片以達均光效果’比如在燈具設計上為達均光效果，利用燈罩並 且將i散片套設在燈罩之開口端，以讓光源之光線一部分自燈罩反 射再、工擴Μ牙透，—部分由擴散片直接射出，以達均光霧化效果。 復如第一圖所示，其係證書號編為第膨號的「擴散片之結 、、良」新里專利案，其所揭露是表面擴散型之擴散片⑼，利用滅渡、 賀塗或印财法，於紐61之人光 數擴散微粒子62之擴散声65，一 〇成。3稷 ，、曰 或如弟一圖所不，擴散片70以微粒黏 藉以开招之出光面74黏附擴散微粒子72以形成一擴散層75，M326171 ' VIII, new description: [New technology field] This creation is a kind of optical diffuser structure, which is a diffuser that can homogenize light in the field of optics, _ involves - thickness variation The diffuser of the scattering layer structure is used to homogenize the light. [Previous technology], the general liquid crystal display 11 is selected according to the actual design requirements _ direct-type or side-lit backlight module architecture, if it is a side-lit backlight module architecture, it mainly uses the light guide plate Pattern (mesh or v-groove) and diffusion film cut) to achieve uniform light diffusion; if it is a direct-lit backlight module architecture, a diffuser is placed above the light source to achieve a uniform light effect. The luminaire is designed to achieve a uniform light effect. The lamp cover is used and the i-scattered piece is sleeved on the open end of the lamp cover, so that a part of the light of the light source is reflected from the lamp cover and expanded, and the part is directly emitted by the diffusion piece to The average light atomization effect. As shown in the first figure, it is a "diffuse film knot, good" Xinli patent case with the certificate number as the expansion number. It is disclosed as a surface diffusion type diffusion sheet (9), which uses the annihilation and congratulation. Or the printing of the law, the diffusion of the light-emitting particles 62 in the New York 61 people, 65, a smash. 3稷 , , 曰 , or as shown in the figure of the younger brother, the diffusion sheet 70 adheres to the diffusing surface 72 with the light-emitting surface 74 of the particle to form a diffusion layer 75.
In矣則粗輪表面’而使光反射及折射達到光擴散效果，諸如 第=____，纖織薄，基本結構多如 弟、一圖所示。 但以微粒_、_方法在製程時由於重力、黏滞力或靜 5 M326171 電等因素練擴散微粒子難柄分佈_著射，因而有擴散層分稀 不均之問題，如以研磨方式難於基材之表面進行機械研$ 程上會存在損傷或減弱紐之結構強度問題，祕先前技術對此—問 題並未揭示任何解決的手段。 而為改善擴散片具㈣型化的魏設計，得以在燈具及液晶顯示 器之背光模組結構應用上可達到更薄尺寸，所以如第三圖所示，其^ 證書號編為第M268167號「具有光擴散片之f光模組」專利案，其揭 露表面擴散型之擴散片80，其主要係冷陰極燈管型態的光源Μ放置 於反射片9〇與擴散片8〇之間，而擴散片8〇製成較大厚度之厚部狀， 而一厚部之間形成—薄部89。然而由於頂板％與擴散請之間的出 光面84為一平面，入光面83為對光源25而言為一凸面，因而背光模 組作薄型化時，由於厚度變化酬是反比於至少—光源25與頂板 間距離_係’使得人絲83 _線更騎曲，造成厚部88太厚， 同時薄部89之曲面與入射光之入射角太大，反而出現亮度不足 題。 J 【新型内容】 爰是，有鏗於習知技術之缺失，本創作之主要 光學擴散片之構造，1 隹於杈仏種 、八主要係有姐#擴散片的光 片應用於背光模組及燈且，可f且餐二 ％、使擴政 度的特點 ⑽,、了更具_化而不降低 因此依據本創作的技術手段， 下所列·· 本創作可以獲得的功賴要說明如 6 M326171 本創作主要係散射層與透光層結合，尤其針對散射層本身呈凹凸 的曲線’其卿成散射層的厚度變化，藉使散射層厚度係正比於距離 取近之光源，其在不同角度所放射的光輻射亮度之對數(1〇garithm)，並 且是反比於擴散微粒子之濃度，並且散射層配合於内部均勻散佈擴散 微粒子’因此在薄型化設計當中，可以消除因縮短光源與擴散片之距 -，離所造成光線亮度不均的問題，得到擴散片兼具備薄型化、光亮度均 •勻化特點，得以充份應用於背光模組及燈具，解決以往薄型化難以使 # 亮度均勻等問題。 【實施方式】 本創作係一種光學擴散片之構造，請參看第四圖所示，本創作之 擴散片ίο主要係由一透光層15a與一散射層15接合構成的複合層構 &。其中該透光層15a為透光性材料，在反向於光源2〇該面係為出光 面16，出光面16為平面，用以外加其他光學膜片時，得有一良好緊 密接觸性； 而戎散射層15為内含均勻分佈之擴散微粒子12的透光材料，用 以達到♦化散射層15厚度控制光透過率，其巾散射層15具有供光源 2〇之光線射入之入光面13，以及供光線射出的出光面14，散射層15 之入光面13對每一光源2〇可為平面或凹面，而第四圖所示者係為平 面，如此可防止在散射層15的薄部19區域之入射面的法線與入射光 有〜41。的入射角，而散射層15厚度係正比於距離最近之光源，其在 不同角度所放射的光補亮度之對數(1〇garithm),並且是反比於擴散微 教子12之濃度’薄部19之區域的出光面為14a。 7 M326171 w職㈣I5厚度係正比於麟最近之絲，其在*㈣度所放 射的光輻射亮度之對數(l〇garithm)，並且是反比於擴散微粒子12之濃 度，其對應關係因應縮短擴散片10與光源2〇之距離時，光源如本身 在不同角度所放射的光輻射亮度(簡稱為配光曲線)對於擴散片ι〇之透 光率的影響’是大於擴散片10與光源2〇之距離的影響，而散射層Μ ，中擴散微粒子12齡#分佈，但藉使用不關度值可修正散射声 ，15之厚度。 曰 根據光垂直人射-厚度x的物體，其光透過率與物體厚度及内部 粒子濃度有關，可表示成下列公式·· 1=1〇 · exp (- α · x) 其中I:穿透之絲射亮度；1():人射之光輻射亮度；物體對光 之吸收係雜舰餘技度㈣；χ :倾的厚度。（綠射亮度定 義·光源在某-方向上的單位投影面積、#立體角中的輕射通影 故上式取對數後’改為H〇g^)/a，因而散射層厚度變化取正 比於光源西己光曲線之對數(l〇garithm)及反比於擴散微粒子之濃声。因 此、如第_所示代表株射亮度的W2與厚度χι、χ2_足 不/i2=i〇gJ#)關係。 如果弟四圖所示_ 1G対非平滑曲線結構超過 為== 產生亮暗不均，娜在散射層Μ爾較薄的薄部 4、所屬的出細14該計為平滑曲線，比如是拋物線、圓 弧線等作-嶋接，使得嶋㈣15之編Μ係為一階可微 8 M326171 分曲線。 弟五圖所示散射層之出光面14與入光面13亦為相同作法，惟 相應光源2G的人光面13 _㈣。細、示_ η血透 光鋒可選用之材料’比如是透明之梦膠、橡膠、環氧樹呵 i.^Sl(PMC) > ^^^^(Polyamide). ^ ^ (PP)、壓克力樹酯、聚碳酸酯、石英或玻璃。 人In矣 is the surface of the rough wheel, and the light is reflected and refracted to achieve a light diffusing effect, such as the first ____, the thin woven fabric, and the basic structure is as shown in the figure. However, the particle _, _ method in the process due to gravity, viscous force or static 5 M326171 electricity and other factors to spread the diffusion of fine particles difficult to handle _ shot, so there is a problem of diffusion layer sparse unevenness, such as grinding is difficult to base The mechanical surface of the material will be damaged or weakened by the mechanical strength of the surface. The prior art has not revealed any means of solution. In order to improve the diffusion of the film (four) type of Wei design, the backlight module structure of the lamp and the liquid crystal display can be used to achieve a thinner size, so as shown in the third figure, the certificate number is numbered M268167. Patent application of the optical module having a light-diffusing sheet, which discloses a surface-diffusion type diffusion sheet 80, which is mainly a cold cathode tube type light source Μ placed between the reflection sheet 9〇 and the diffusion sheet 8〇, and The diffusion sheet 8 is formed into a thick portion having a large thickness, and a thin portion 89 is formed between a thick portion. However, since the light-emitting surface 84 between the top plate % and the diffusion is a plane, the light-incident surface 83 is a convex surface for the light source 25. Therefore, when the backlight module is thinned, the thickness variation is inversely proportional to at least the light source. The distance between the 25 and the top plate is such that the wire 83 _ line is more arched, causing the thick portion 88 to be too thick, and the incident angle of the curved surface of the thin portion 89 and the incident light is too large, and the brightness is insufficient. J [New Content] The trick is that, contrary to the lack of conventional technology, the structure of the main optical diffuser of this creation, 1 隹 杈仏 、 、 八 八 八 八 八 八 扩散 扩散 扩散 扩散 扩散 扩散 扩散 扩散 扩散 扩散 扩散 扩散 扩散And the lamp can be used, and the characteristics of the degree of expansion (10) are more _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ For example, 6 M326171 is mainly composed of a scattering layer combined with a light-transmitting layer, especially for the curve of the scattering layer itself, which has a concave-convex curve, and the thickness of the scattering layer is proportional to the distance of the light source, which is The logarithm of the radiance of the light radiated from different angles (1〇garithm), and is inversely proportional to the concentration of the diffused particles, and the scattering layer is uniformly dispersed inside the diffused particles. Therefore, in the thin design, the light source and diffusion can be eliminated. The distance between the films - the problem of uneven brightness caused by the light, the diffuser has both thinness, brightness and homogenization characteristics, which can be fully applied to backlight modules and lamps, # Thinning is difficult to uniform brightness and so on. [Embodiment] This creation is a structure of an optical diffusion sheet. Referring to the fourth figure, the diffusion sheet of the present invention is mainly composed of a composite layer structure composed of a light-transmitting layer 15a and a scattering layer 15. The light transmissive layer 15a is a light transmissive material, and the light emitting surface 16 is opposite to the light source 2, and the light emitting surface 16 is a flat surface. When other optical films are used, a good close contact property is obtained; The 戎 scattering layer 15 is a light-transmitting material containing uniformly distributed diffusing particles 12 for controlling the thickness of the scattering layer 15 to control the light transmittance, and the towel scattering layer 15 has a light-incident surface for the light of the light source 2 to enter. 13, and a light-emitting surface 14 for emitting light, the light-incident surface 13 of the scattering layer 15 may be planar or concave for each light source 2, and the plane shown in the fourth figure is a plane, so that the scattering layer 15 is prevented. The normal to the incident surface of the thin portion 19 region and the incident light have ~41. The angle of incidence, and the thickness of the scattering layer 15 is proportional to the nearest source, the logarithm of the brightness of the light radiated at different angles, and is inversely proportional to the concentration of the diffusion micro-teacher 12 The light exit area of the area is 14a. 7 M326171 w (4) The thickness of I5 is proportional to the nearest filament of Lin, the logarithm of the radiance of light emitted by *(four) degrees (l〇garithm), and is inversely proportional to the concentration of diffusing fine particles 12, and the corresponding relationship shortens the diffusion sheet. 10 When the distance from the light source 2〇, the light radiant brightness (referred to as the light distribution curve) emitted by the light source at different angles is more than the diffusion sheet 10 and the light source 2 The effect of the distance, while the scattering layer Μ, the medium diffusion microparticles are 12-year-old, but the thickness of the scattering sound can be corrected by using the non-offensive value.曰According to the vertical human incidence-thickness x, the light transmittance is related to the thickness of the object and the internal particle concentration, which can be expressed as the following formula··1=1〇· exp (-α · x) where I: penetrates Silk brightness; 1 (): the radiance of the light emitted by the person; the absorption of the light by the object is the residual skill of the ship (4); χ: the thickness of the tilt. (Green light definition) The unit projection area of the light source in a certain direction, the light-lighting shadow in the # solid angle, so the upper formula takes the logarithm and then changed to H〇g^)/a, so the thickness of the scattering layer changes proportionally. The logarithm of the light source Xijiguang curve (l〇garithm) and the inverse sound of the diffused particles. Therefore, as shown in the _th, the relationship between the brightness of the representative image and the thickness χι, χ2_foot/i2=i〇gJ#). If the _ 1G 対 non-smooth curve structure shown in the fourth figure exceeds ==, the light and dark unevenness is generated. In the thin layer 4 of the scattering layer, the thin portion 4 belongs to the smooth curve, such as a parabola. The arc line is also spliced, so that the 嶋(4)15 is edited as a first-order micro-8 M326171 partial curve. The light-emitting surface 14 of the scattering layer shown in the fifth diagram is the same as the light-incident surface 13, except for the human light surface 13_(4) of the corresponding light source 2G. Fine, show _ η blood translucent front of the choice of materials 'such as transparent dream gel, rubber, epoxy tree ah i. ^ Sl (PMC) > ^ ^ ^ ^ (Polyamide). ^ ^ (PP), Acrylic resin, polycarbonate, quartz or glass. people
散射層15中的擴散微粒子12則可為二氧化欽(Ti〇2)、二氧化石夕 (、'月石在母、氧化鎮(Mg〇)、硫酸鋇(BaS〇4)、硫化鋅(ZnS)等 等消光係數很小，比如小於αι之材料，雜則為中空或實心之圓球 體、橢球體或其他多面體，粒徑大小在〇1〜刚微米之間，較佳實施 狀態是在0·2〜10微米之間。 u亥擴政片10使用於白熾燈、發光二極體(led)、熱陰極螢光燈管 (HCFL)、冷陰極妓燈f(CCFL)及平板狀光源··等絲之光學模組中 有良好的擴散均勻及薄型化效果。 請再參閱第六圖所示擴散片10應用實施例之剖面圖，其顯示一殼 體30之内面31鍍銀或鋁薄膜i〇a(或塗佈有光反射效能之塗料或貼覆 有光反射模），而一光源20置於燈罩10與本創作擴散片1〇之間，將 光源20分為20a、20b、20c及20d四區。首先說明圖面之左半邊情形， 由於鏡面反射效應，可想而知在等距離dl產生虛光源21及等距離也 產生虛光源22。因此光源20的20a部分之配光曲線，同時配合虛光 源22的22c區部分之成像光源而照射於擴散片1〇上，另外光源2〇的 20b部分之光強度配光曲線則是由光源21的2ia部分取代而照射於擴 M326171 散片10上。因此在薄型化的模組結構中，散射層15厚度變化，吾人 取為正比於距離最近之光源在不同角度所放射的光強度之對數 (logarithm)且反比於第四圖所示擴散微粒子12之濃度。 同理，圖面之右半邊情形亦相同，若光源2〇為白熾燈、…等 之點光源，則散射層15之出光面14[請配合第四圖]曲面形狀像傘狀； 若光源20為HCFL、CCFL···等之線光源，則散射層15之出光面14[請 配合第四圖]曲面形狀像長條脊狀。 再請參閱第七圖之剖面圖’運用本創作之擴散片！ 〇可以改善習知 技術中關於直下式背光模組之_化及均光問題。直下式背光模組係 包含-殼體301、-反射片42、複數個光源2〇、一擴散片1〇、一擴散 膜片40及-增梵膜片4卜將上述元件組合在一起構成模組，最後使 液，面板5G置於背光模組之上。如果光源2Q如為週期排列者，則取 、早兀結構55說明’其顯示其左邊散射層^的厚度變化是正比於光 源20中20a及21b部分的配光曲線照射於擴散層之對數，同樣單 元結構55中右邊散射層15的厚度變化是正比於光㈣中施及別 部分的配光曲線照射於擴散層15之對數。 形狀則在、雄為CCFL(4 HCFL) ’則單元結構55中整個散射層15 且陣排列’則單元結㈣中整個散射層二狀= :透納ΓΓΓ性的難，最後透光層l5a覆蓋於散射層15上， 而透7b層15a之出光面16與散射層15之入光 第四圖]，其他光學片則與透光層15a之出光替、仃麵合 出先面16緊貼[請配合第四 M326171 圖]。如此在直下式背光模_型化同時，即可維持一定光均句性並且 不會降低亮度。 第八圖所示較佳實施例之剖面圖，係應用於7对以下之側光式背 光模組，包含一殼體302、一反射片4?、伞、、盾％ ^ ^ 耵月42先源20、一擴散片102及 Γ增亮則41。同樣將光源2〇分成為施、2〇b、2GC及施四區， 百先光源2〇中2〇c部分之配光曲線直接經空腔56而照射在擴散片脱 上，出光面U1呈傾斜面狀，另外观部分之配光曲線經經空腔56 及反射片42亦照射在擴散片⑽上。因此取散射層15的厚度變化是 正比光源20中施及21d部分的配光曲線照射於擴散層15之對數； 至於光源20中20a與20b部分的光，則經半圓形反射片42反射後， 水平進入空腔56之巾，故而對7 p切下之式f光模組而言，由實 驗結果可約略視為均勻分佈至擴散片1〇2上。The diffusing fine particles 12 in the scattering layer 15 may be dioxins (Ti〇2), dioxide dioxide (, 'moonstone in the mother, oxidized town (Mg〇), barium sulfate (BaS〇4), zinc sulfide ( ZnS) and the like have a small extinction coefficient, such as a material smaller than αι, a heterogeneous hollow or solid sphere, an ellipsoid or other polyhedron, and the particle size ranges from 〇1 to just micron, and the preferred embodiment is at 0. · 2~10 microns. u Hai expansion film 10 is used in incandescent lamps, LEDs, hot cathode fluorescent lamps (HCFL), cold cathode xenon lamps f (CCFL) and flat light sources. ·The optical module of the wire has good uniformity of diffusion and thinning effect. Please refer to the cross-sectional view of the application example of the diffusion sheet 10 shown in the sixth figure, which shows that the inner surface 31 of the casing 30 is plated with silver or aluminum film. I〇a (or a coating coated with a light reflecting property or a light reflecting mold), and a light source 20 is placed between the lampshade 10 and the artificial diffusion sheet 1 to divide the light source 20 into 20a, 20b, 20c And 20d four zones. First, explain the left half of the picture surface. Due to the specular reflection effect, it can be imagined that the virtual light source 21 and the equidistance are generated at the equidistant distance dl. The virtual light source 22 is also generated. Therefore, the light distribution curve of the portion 20a of the light source 20 is simultaneously irradiated onto the diffusion sheet 1 配合 with the imaging light source of the 22c portion of the virtual light source 22, and the light intensity distribution of the 20b portion of the light source 2 〇 The curve is replaced by the 2ia portion of the light source 21 and is irradiated onto the expanded M326171 film 10. Therefore, in the thinned module structure, the thickness of the scattering layer 15 changes, which is proportional to the light source at a different angle. The logarithm of the light intensity is inversely proportional to the concentration of the diffusing particles 12 shown in the fourth figure. Similarly, the right half of the figure is also the same. If the light source 2 is a point source such as an incandescent lamp, etc., the scattering The light exit surface 14 of the layer 15 [please match the fourth figure] the curved surface shape is like an umbrella shape; if the light source 20 is a line light source such as HCFL, CCFL, etc., the light exit surface 14 of the scattering layer 15 [please match the fourth figure] The shape is like a long ridge. Please refer to the sectional view of the seventh figure. 'Using the creation of the diffusion sheet! 〇Improve the _ ing and averaging problems of the direct-lit backlight module in the conventional technology. The direct-lit backlight module Contains - housing 301, - reflection 42. A plurality of light sources 2〇, a diffusion sheet 1〇, a diffusion film 40, and a Zanfan film 4 are combined to form a module, and finally, the liquid and the panel 5G are placed on the backlight module. If the light source 2Q is periodically arranged, then the early 兀 structure 55 indicates that it shows that the thickness variation of the left scattering layer is proportional to the logarithm of the light distribution curve of the portions 20a and 21b of the light source 20, which is irradiated to the diffusion layer. Similarly, the thickness variation of the right scattering layer 15 in the unit structure 55 is proportional to the logarithm of the light distribution curve of the other part of the light (4) irradiated to the diffusion layer 15. The shape is then, the male is CCFL (4 HCFL) 'the unit structure 55 The entire scattering layer 15 and the array arrangement 'the whole scattering layer in the cell junction (4) is two-shaped =: the difficulty of transmissive enthalpy, finally the light-transmissive layer 15a covers the scattering layer 15, and the light-emitting surface 16 of the 7b layer 15a is The fourth layer of the light entering the scattering layer 15 is the same as that of the light-transmissive layer 15a, and the first surface 16 is attached to the front surface 16 [please cooperate with the fourth M326171]. In this way, while the direct type backlight mode is being patterned, a certain uniformity of light can be maintained without lowering the brightness. The cross-sectional view of the preferred embodiment shown in the eighth embodiment is applied to a seven-to-below side-lit backlight module, including a housing 302, a reflective sheet 4, an umbrella, and a shield % ^ ^ Source 20, a diffuser 102, and a brightening 41 are 41. Similarly, the light source 2 is divided into two parts: the application, the 2〇b, the 2GC, and the four regions. The light distribution curve of the 2〇c portion of the first light source 2〇 is directly irradiated on the diffusion sheet through the cavity 56, and the light exit surface U1 is The inclined surface is formed, and the light distribution curve of the other portion is also irradiated on the diffusion sheet (10) via the cavity 56 and the reflection sheet 42. Therefore, the thickness variation of the scattering layer 15 is proportional to the logarithm of the light distribution curve of the portion of the light source 20 applied to the portion 21d, and the light of the portions 20a and 20b of the light source 20 is reflected by the semicircular reflection sheet 42. , the horizontal into the cavity 56, so for the 7 p cut-off type f optical module, the experimental results can be roughly considered to be evenly distributed to the diffusion sheet 1〇2.
因此最後對於擴散片102之散射層15的厚度變化是正比光源2〇 中20c及2M部分的配光曲線照射於擴散層15之對數。而透光層^ =出光面，則保持與散射層15之入射光面132平行，以利於與增 免膜片4丨緊密貼附。至於空腔％亦可用導光板取代，此時本創作之 擴散片102之材料，宜選用軟性材質，如石夕膠。 上述實施罐細雜·摘作之技術及其功效，而非用於限 制本創作。任何胁此項技術人士均可在不違背本創狀技術原理及 精2的兄下’對上述實施例進行修改及變化，因此本創作之權利保 5 蒦範圍應如後所述之申請專利範圍所列。 M326171 【圖式簡單說明】 第一圖係為習知表面擴散型擴散片之剖面圖（出光面擴散層) 第一圖係為習知表面擴散型擴散片之剖面圖(黏附法） 第三圖係為習知入射面曲線變化之擴散片之剖面圖 •、第四圖係為本創作較佳實施例之擴散片結構示意圖 •第五圖係為本創作另一較佳實施例之擴散片結構示意圖 籲第六圖係為應用於照明光源中擴散片結構示意圖 第七圖係為應用於直下式背光模組中擴散片之結構示意圖 第八圖係為應用於側光式背光模組中擴散片之結構示^圖 【主要元件符號說明】 “ 10、101、102 擴散片 15a透光層 15散射層 12擴散微粒子 • 13'13卜132入光面 _ 14、16、141 出光面 19、89薄部 2〇、25光源 30、301、302 殼體 31内面 50液晶面板 55單元結構 56空腔 12 M326171 -40擴散膜片 41增亮膜片 42、90反射片 6、70、80擴散片 61、71基材 β 63、83入光面 • - 64、74、84 出光面 • 62、72擴散微粒子 參 65、75擴散層 88厚部 91頂板Therefore, finally, the thickness variation of the scattering layer 15 of the diffusion sheet 102 is proportional to the logarithm of the diffusion layer 15 in proportion to the light distribution curves of the portions 20c and 2M of the light source 2A. The light-transmitting layer ^ = light-emitting surface remains parallel to the incident light surface 132 of the scattering layer 15 to facilitate adhesion to the enhanced film 4 . As for the cavity %, it can also be replaced by a light guide plate. In this case, the material of the diffusion sheet 102 of the present invention should be made of a soft material such as Shixia. The above-mentioned techniques and effects of implementing the cans are not limited to the present invention. Anyone who threatens this technology can modify and change the above-mentioned embodiments without violating the technical principles of this invention and the finer ones. Therefore, the scope of the rights of this creation should be as follows. Listed. M326171 [Simple description of the drawing] The first figure is a cross-sectional view of a conventional surface diffusion type diffusion sheet (light-emitting surface diffusion layer). The first figure is a sectional view of a conventional surface diffusion type diffusion sheet (adhesion method). A cross-sectional view of a diffuser having a change in the curve of the incident surface. The fourth figure is a schematic view of the structure of the diffuser of the preferred embodiment. The fifth figure is a diffuser structure of another preferred embodiment of the present invention. The sixth diagram is a schematic diagram of the structure of the diffusion sheet used in the illumination source. The seventh diagram is a schematic diagram of the structure of the diffusion sheet used in the direct-type backlight module. The eighth diagram is applied to the diffusion sheet of the edge-lit backlight module. Structure shown in Fig. [Description of main component symbols] "10, 101, 102 diffuser 15a light transmissive layer 15 scattering layer 12 diffused microparticles ・ 13'13 bu 132 into the glossy surface _ 14, 16, 141 light emitting surface 19, 89 thin Part 2, 25 light source 30, 301, 302 housing 31 inner surface 50 liquid crystal panel 55 unit structure 56 cavity 12 M326171 - 40 diffusion diaphragm 41 brightening diaphragm 42, 90 reflection sheet 6, 70, 80 diffusion sheet 61, 71 substrate β 63, 83 into the glossy surface • - 64, 74 84 fine reference surface diffusion • 62,72 65,75 diffusion layer 88 thickness of the top plate portion 91