TW200916835A - Optical diffuser for flat light source - Google Patents

Optical diffuser for flat light source Download PDF

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Publication number
TW200916835A
TW200916835A TW96137371A TW96137371A TW200916835A TW 200916835 A TW200916835 A TW 200916835A TW 96137371 A TW96137371 A TW 96137371A TW 96137371 A TW96137371 A TW 96137371A TW 200916835 A TW200916835 A TW 200916835A
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Taiwan
Prior art keywords
light
diffusing plate
optical diffusing
layer
scattering layer
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TW96137371A
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Chinese (zh)
Inventor
Wei-Chung Cheng
Kung-Tung Pan
mei-hui Huang
Shih-Hsien Lin
Chao-Wei Yang
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Delta Electronics Inc
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Priority to TW96137371A priority Critical patent/TW200916835A/en
Publication of TW200916835A publication Critical patent/TW200916835A/en

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Abstract

An optical diffuser for a flat light source includes a scattering layer and a first transparent layer. The scattering layer has a first light incident surface faced to the flat light source. The first transparent layer is disposed on the scattering layer and has a light emitting surface far from the flat light source. An interface surface is formed between the scattering layer and the first transparent layer. The shape of the interface surface corresponds to the brightness distribution of the flat light source entering the scattering layer.

Description

200916835 九、發明說明： 【發明所屬之技術領域】 本毛月係關於光學擴散板’特別是關於一種用 於平面光源的光學擴散板。 【先前技術】 由於液晶顯示面板本身並不具有發光的功能，故在 液晶顯示面板下方必須設置—背光模組（bacldight module)以提供光源，進而達到顯示的功能。背光模組 係由光源及複數光學元件所構成。f知光源係以冷陰極 發光燈管（CCFL)所組成之線光源，亦有使用發光二 極體（LED)之點光源，到最近更有平面螢緖 光源。 平面勞光燈是-種電榮發光元件，其主要是利用介 電層放電原理，產生二次電子，與氣體放電腔中電極之 間的惰性氣體產生碰撞’並將氣體離子化或形成激發態 原子以形成電漿。之後，電漿中屬於激發態的原子會以 放射紫外光的方式回到基態，而所放射之紫外光會進一 步激發平面榮光燈中的螢光體，轉而產生可見光。不論 背光模組使用何種光源，皆需藉由擴散板等光學元件才 能達到將光源光線均^ t的效果。然而，擴散板之設計 需依照光源發光之特性，以符合實際需求。 習知背光模組1係包 面光源L係為平面螢 、入光面12及出光面 請參照第1A至1C圖所示， 括平面光源L以及擴散板。平 光燈。擴散板10係包括基板u 200916835 13。為使平面光源L之光線更㈣，如第^圖 擴散板10係在基板口入不同折射率之擴散材質 使光線產生不規則散射而均勻化。其中基板u ’ 可為聚乙烯等材料；以及擴散材質丨4可為二氧化鈦 如第®所示’另―則知之擴散板心，= 散材質η也可設置於入光自12。或如第ic圖所示，、 擴散板1 〇b係將擴散材質14設置於出光面13。上述二 種習知擴散板10、10a'l〇b皆藉由擴散材質14之設置^ 使平面光源L·之光線產生不規則散射而均勻化。叹， 然而，平面螢光燈為非均勻放電，故所發出之光源 輝度（Brightness)分佈並不均勾。當使用習知之光學 擴散板時，需與平面光源間隔一段距離。如此，平面2 源之輝度值便會下降，進而影響背光模 因此，如何提供一種用於平面光源的光= 使平面光源之輝度均勻化，且不使平面光源之輝度值下 降，已成為重要課題之一。 【發明内容】 有鑑於上述課題，本發明之目的為提供一種用於平 面光源的光學擴散板，使平面光源之光線經由光學擴散 板擴散後可產生高輝度及輝度均勻之光線。 緣是，為達上述目的，依據本發明之一種用於平面 光源的光學擴散板包括一散射層以及一第一透光層。散 射層具有一第一入光面朝向平面光源。第一透光層設置 200916835 於散射層上，且具有一出古；、土 ^ 先面遇離平面光源。散射層與 弟一透光層連接處形成—界 介囟其中，界面的形狀係對 應於平面光源入射至散射層的輝度分佈。 …為達上述目的，依據本發明之—種用於平面光源的 光學擴散板，平面光源具有至少—發光單元，光學擴散 板包括-散射層以及一第一透光層。散射層具有一入光 平面及一連續非均句之厚度’以及入光平面係面對發光 單元。第一透光層係設置於散射層上，並具有一出光平 面遠離發鮮元。其中’散射層的厚度分佈係正比於發 光單元入射至入光平面的輝度。 為達上述目的，依據本發明之一種用於平面光源的 光學擴散板，平面光源具有至少一發光單元，光學擴散 板包括一散射層以及一第一透光層。散射層係設置於發 光單元之上，並具有一入光平面及一出光曲面，入光^ 面朝向發光單元。第一透光層係設置於出光曲面上，並 具有一出光平面遠離發光單元。其中，散射層之入光平 面與出光曲面之間的垂直距離係正比於發光單元入射 至入光平面的輝度。 承上所述’本發明之一種用於平面光源的光學擴散 板係藉由散射層之出光面與第一透光層之界面形狀對 應於平面光源入射至散射層的輝度分佈，亦或藉由散射 層之連續非均勻厚度正比於光源入射至入光平面的輝 度’使平面光源產生之輝度更均勻。與習知技術相較， 本發明之光學擴散板能夠使輝度不均勻之平面光源光 200916835 線轉變為輝度均句之光線射出，且輝度值並不因光學擴 散板擴散後而下降，進而使背光模組可提供高輝度及輝 度均勻之光線。 【實施方式】 以下將參照相關圖式，說明依據本發明較佳實施例 之一種用於平面光源的光學擴散板，其中相同的元件將 以相同的參照符號加以說明。 請參照第2圖所示，本發明提供一種用於平面光源 L的光學擴散板20，平面光源L係與光學擴散板2()組 成一背光模組2。於本實施例中，平面光源^係以一平 面螢光燈為例說明。光學擴散板20包括一散射層21以 及一第一透光層22。散射層21具有一入光面211，並 朝向平面光源L。第一透光層22設置於散射層21上， 且具有出光面221遠離平面光源l。散射層21與第 透光層22之連接處形成一界面I。其中界面^之形狀 係具有至少一凸曲面II，且凸曲面n係可為直條脊狀 曲面、三角脊狀曲面、ϋ型脊狀曲面或橢圓曲面。 散射層21與第一透光層22之界面Σ的形狀係對應 於平面光源L入射至散射層21的輝度分佈。詳而言之， 界面I的形狀其厚度變化係正比於平面光源L入射至散 射層21的輝度分佈。 散射層21包括至少一擴散材質23，係選自二氧化 鈦、二氧化矽、滑石、雲母、氧化鎂、硫酸鋇、硫化鋅 200916835 及其組合所構成的群組。其中擴散材質23的粒徑可介 於0.05微米（μη〇至200微米之間。於本實施例中， 擴散材質23的粒徑係較佳介於〇2微米至1〇微采之 間另外，擴散材質23可均勻分佈於散射層2 j内，亦 或分佈的密度係反比於平面光源L入射至入光面2ιι的 輝度分佈。於本實施例中，擴散材質Μ係均勻分佈於 散射層21内。 散射層2丨與第一透光層22之材質係選自聚對笨二 甲酸乙二酸酯、聚碳酸酯（PC)、聚乙_ (pE)、聚亞 乙烯、聚苯乙烯、壓克力樹脂（PMMA)、聚曱基丙稀 酸甲酉旨（PVC)、麗克力與聚丙稀共聚物、石夕膠、橡膠 或環氧樹脂、熱固型巯胺、酚醛樹脂、石英、玻璃及其 組合所構成的群組。需注意的是，散射層21與第一透 光層22的材質係可為相同或不相同。 當平面光源L發出光線入射至散射層21之入光面 後’經擴散材質23之散射及界面〗之形狀擴散及調 i後，平面光源L之出光輝度更均勻分佈。 請參照第3圖所示，其為本發明另一種用於平面光 源L2的光學擴散板3〇，平面光源L2係與 3_0組成一背光模組3。光學擴散板3〇包括—散射層3卜 :第—透光層32及一第二透光層33。平面光源曰⑴系 二有至少一發光單元L2i，發光單元L21可為冷陰極螢 光燈管、發光二極體或有機發光二極體。於本實施例 200916835 中，係以複數個發光單元L21(例如複數個發光 所組成之平面光源L2為例。 散射層31係具有一入光平面311及一出光曲面 312,且出光曲面312具有一凸曲面。散射層31沿著出 光曲面312與入光平面311之間係具有一連續非均勾厚 度，其中厚度最小為di且厚度最大為d2。其中，散射 層31的厚度cu、d2之分佈係正比於該等發光單元⑶ 入射至人光平面311的輝度，亦即散射層31之入光平 面311肖出光曲面312的垂直距離係正比於發光單元 二入光平面3U的輝度，即入光強度較高處， 政層31的厚度較大或入光平面與出光西面312 之間的距離較大。 第二透光層33係鄰設於散射層31之入光平面 質：如Γ實施例之散射層21或第-透光層 第層散射層31、第-透光層32及 第一透先層33的材質係可為相同或不相同。 另外，為提高出光學擴散板3 效果，第一读本心®疋双手及擴散 ^ ^ 出光平面321係具有至少一忾 結構P。其中，微結構p 认 粗糙面等構造。 ”為透鏡、稜鏡、多層膜或 綜上所述，本發明之— Μ S 種用於平面光源的光學擴散 光面與苐-透光層之界面形狀;ί Μ /' '至政射層的輝度分佈，亦或藉由散射 層之連續非均勻厚度正比於h 飞猎由政射 G π先源入射至入光平面的輝 10 200916835 度，使平面光源產生之輝度更均勻。與習知技術相較， 本發明之光學擴散板能夠使輝度不均勻之平面光源光 線轉變為輝度均勻之光線射出，且輝度值並不因光’學擴 散板擴散後而下降，進而使背光模組可提供高輝度2^ 度均勻之光線。200916835 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to an optical diffusing plate, particularly to an optical diffusing plate for a planar light source. [Prior Art] Since the liquid crystal display panel itself does not have the function of emitting light, a backlight module (bacldight module) must be provided under the liquid crystal display panel to provide a light source to achieve the display function. The backlight module is composed of a light source and a plurality of optical components. The light source is a line source composed of a cold cathode fluorescent lamp (CCFL), and a point source using a light emitting diode (LED). Recently, there is a flat fluorescent light source. The flat work light lamp is a kind of Kelly light-emitting element, which mainly uses the dielectric layer discharge principle to generate secondary electrons, collides with the inert gas between the electrodes in the gas discharge chamber and ionizes or forms an excited state. Atom to form a plasma. After that, the atoms in the plasma that are excited will return to the ground state by emitting ultraviolet light, and the emitted ultraviolet light will further excite the phosphor in the planar glory to produce visible light. Regardless of the light source used in the backlight module, it is necessary to achieve the effect of illuminating the light source by using optical components such as a diffusion plate. However, the design of the diffuser plate is based on the characteristics of the light source to meet the actual needs. The conventional backlight module 1 is a planar light source L, which is a flat fluorescent light, a light incident surface 12, and a light emitting surface. Referring to Figs. 1A to 1C, a planar light source L and a diffusing plate are included. Flat light. The diffusion plate 10 includes a substrate u 200916835 13 . In order to make the light of the planar light source L more (4), as shown in the drawing, the diffusing plate 10 is formed by diffusing a different refractive index into the substrate to make the light irregularly scattered and uniform. The substrate u ′ may be a material such as polyethylene; and the diffusion material 丨 4 may be titanium dioxide as shown in the ′′'s other known diffusion plate core, and the scatter material η may also be disposed at the light source 12 . Or, as shown in the ic diagram, the diffusion plate 1 〇b is provided with the diffusion material 14 on the light-emitting surface 13. The above two conventional diffusion plates 10, 10a'lb are uniformly homogenized by the irregular scattering of the light of the planar light source L· by the arrangement of the diffusion material 14. Sigh, however, the flat fluorescent lamp is non-uniformly discharged, so the brightness distribution of the light source emitted is not uniform. When using a conventional optical diffuser, it is necessary to be spaced apart from the planar light source. In this way, the luminance value of the plane 2 source will decrease, thereby affecting the backlight mode. Therefore, how to provide a light for a planar light source = uniformizing the luminance of the planar light source without degrading the luminance value of the planar light source has become an important issue. one. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an optical diffusing plate for a planar light source, which can diffuse light of a planar light source through an optical diffusing plate to generate light having high luminance and uniform luminance. In order to achieve the above object, an optical diffusing plate for a planar light source according to the present invention comprises a scattering layer and a first light transmitting layer. The diffusing layer has a first light incident surface facing the planar light source. The first light-transmissive layer is disposed on the scattering layer and has an anti-corrosion layer; The scattering layer forms a junction with the light-transmitting layer, and the shape of the interface corresponds to the luminance distribution of the planar light source incident on the scattering layer. In order to achieve the above object, in accordance with the present invention, an optical diffusing plate for a planar light source having at least a light emitting unit, the optical diffusing plate comprising a scattering layer and a first light transmitting layer. The scattering layer has an entrance light plane and a thickness of a continuous non-uniform sentence' and the light entrance plane faces the illumination unit. The first light transmissive layer is disposed on the scattering layer and has a light emitting surface away from the fresh element. Wherein the thickness distribution of the scattering layer is proportional to the luminance of the light-emitting unit incident on the light-input plane. To achieve the above object, in accordance with an optical diffusing plate for a planar light source of the present invention, the planar light source has at least one light emitting unit, and the optical diffusing plate includes a scattering layer and a first light transmitting layer. The scattering layer is disposed on the light emitting unit and has an entrance light plane and a light exiting surface, and the light incident surface faces the light emitting unit. The first light transmissive layer is disposed on the light exiting surface and has a light exiting plane away from the light emitting unit. The vertical distance between the light incident surface of the scattering layer and the light exiting surface is proportional to the luminance of the light emitting unit incident on the light incident plane. The optical diffusing plate for a planar light source according to the present invention is characterized in that the interface shape of the light-emitting surface of the scattering layer and the first light-transmitting layer corresponds to the luminance distribution of the planar light source incident on the scattering layer, or by The continuous non-uniform thickness of the scattering layer is proportional to the brightness of the light source incident on the light entrance plane' to make the luminance produced by the planar light source more uniform. Compared with the prior art, the optical diffusing plate of the present invention can convert the light of the plane light source 200916835 which is uneven in luminance into the light of the uniformity of the luminance, and the luminance value does not fall due to the diffusion of the optical diffusing plate, thereby making the backlight The module provides high brightness and uniform brightness. [Embodiment] Hereinafter, an optical diffusing plate for a planar light source according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals. Referring to Fig. 2, the present invention provides an optical diffuser 20 for a planar light source L. The planar light source L and the optical diffuser 2 () form a backlight module 2. In this embodiment, the planar light source is illustrated by a flat fluorescent lamp. The optical diffuser 20 includes a scattering layer 21 and a first light transmissive layer 22. The scattering layer 21 has a light incident surface 211 and faces the planar light source L. The first light transmissive layer 22 is disposed on the scattering layer 21 and has a light exiting surface 221 away from the planar light source 1 . An interface I is formed at the junction of the scattering layer 21 and the first light transmissive layer 22. The shape of the interface ^ has at least one convex curved surface II, and the convex curved surface n can be a straight ridge curved surface, a triangular ridge curved surface, a ϋ-shaped ridge curved surface or an elliptical curved surface. The shape of the interface Σ between the scattering layer 21 and the first light-transmitting layer 22 corresponds to the luminance distribution of the planar light source L incident on the scattering layer 21. In detail, the shape of the interface I has a thickness variation proportional to the luminance distribution of the planar light source L incident on the scattering layer 21. The scattering layer 21 comprises at least one diffusion material 23 selected from the group consisting of titanium dioxide, cerium oxide, talc, mica, magnesium oxide, barium sulfate, zinc sulfide 200916835, and combinations thereof. The diffusion material 23 may have a particle diameter of 0.05 μm (μη〇 to 200 μm). In this embodiment, the diffusion material 23 preferably has a particle diameter of between 〇2 μm and 1 μM. The material 23 can be evenly distributed in the scattering layer 2 j, or the density of the distribution is inversely proportional to the luminance distribution of the planar light source L incident on the light incident surface 2 ιι. In this embodiment, the diffusion material lanthanum is uniformly distributed in the scattering layer 21 . The material of the scattering layer 2丨 and the first light transmissive layer 22 is selected from the group consisting of poly(p-dimethyl phthalate), polycarbonate (PC), poly-(pE), polyethylene, polystyrene, and pressure. PMMA, poly(methyl acrylate), PVC, acryl and polypropylene copolymer, shijiao, rubber or epoxy resin, thermosetting guanamine, phenolic resin, quartz, A group of glass and a combination thereof. It should be noted that the materials of the scattering layer 21 and the first light-transmitting layer 22 may be the same or different. When the planar light source L emits light, the light-incident surface of the scattering layer 21 is incident. After the shape of the scattering and interface of the diffusion material 23 is diffused and adjusted, the planar light source L The lightness is more evenly distributed. Please refer to FIG. 3, which is another optical diffusing plate 3 for the planar light source L2, and the planar light source L2 and 3_0 form a backlight module 3. The optical diffusing plate 3〇 Including: a scattering layer 3: a first light transmissive layer 32 and a second light transmissive layer 33. The planar light source 曰(1) has at least one light emitting unit L2i, and the light emitting unit L21 can be a cold cathode fluorescent tube or a light emitting diode In the embodiment of 200916835, a plurality of light-emitting units L21 (for example, a planar light source L2 composed of a plurality of light-emitting elements is taken as an example. The scattering layer 31 has a light-input plane 311 and a light-emitting surface. 312, and the light-emitting surface 312 has a convex curved surface. The scattering layer 31 has a continuous non-homospheric thickness along the light-emitting surface 312 and the light-injecting plane 311, wherein the thickness is at least di and the thickness is at most d2. The thicknesses cu and d2 of 31 are proportional to the luminance of the light-emitting unit (3) incident on the human light plane 311, that is, the vertical distance of the light-incident surface 311 of the scattering layer 31 is proportional to the light-emitting unit. Flat 3U brightness When the intensity of the incoming light is high, the thickness of the political layer 31 is large or the distance between the light incident plane and the light exit west surface 312 is relatively large. The second light transmitting layer 33 is adjacent to the light incident plane of the scattering layer 31: For example, the materials of the scattering layer 21 or the first-light-transmitting layer first-layer scattering layer 31, the first-light-transmitting layer 32, and the first transparent layer 33 of the embodiment may be the same or different. In addition, in order to improve optical diffusion. Plate 3 effect, the first reading of the heart ® 疋 hands and diffusion ^ ^ light plane 321 has at least one 忾 structure P. Among them, the microstructure p recognizes the rough surface and other structures. "For lenses, enamel, multilayer film or above The present invention - Μ S kinds of interface shapes for the optical diffusing surface of the planar light source and the 苐-transmissive layer; ί Μ / ' ' to the political layer of the luminance distribution, or by the continuous non-scattering layer The uniform thickness is proportional to the h shovel from the G π pre-source to the illuminating plane of the incoming light plane of 200916835 degrees, which makes the brightness of the planar light source more uniform. Compared with the prior art, the optical diffusing plate of the present invention can convert the light of the planar light source with uneven brightness into the light with uniform brightness, and the luminance value is not decreased by the diffusion of the light diffusing plate, thereby making the backlight mode The group provides high brightness with a uniform brightness of 2^ degrees.

以上所述僅為舉例性，而非為限制性者。任何未脫 離本發明之精神與料，而對其進行之等效修改或變 更，均應包含於後附之申請專利範圍中。 【圖式簡單說明】 第1A圖係為一種習知背光模組的示意圖； J二圖係、為第1A圖之另-種習知擴散板的示意圖； 第2 ::糸為第Μ圖之又另—種習知擴散板的示意圖; 圖係為依據本發明之一種背光模組及其用於平面 光源的光學擴散板的示意圖；以及 弟3圖料依據本發明之另_種背紐組及其用於平 面光源的光學擴散板的示意圖。 主要元件符號說明 ' 2、3 :背光模組 10、1〇a、10b:擴散板 11 :基板 12、 211 :入光面 13、 221 ·出光面 11 200916835 14、23 :擴散材質 20、 30 :光學擴散板 21、 31 :散射層 22、 32 :第一透光層 311 :入光平面 312 :出光曲面 321 :出光平面 33 :第二透光層 dl、d2 :厚度 I :界面 II :凸曲面 L、L2 :平面光源 L21 :發光單元The above is intended to be illustrative only and not limiting. Any changes or modifications that are made without departing from the spirit and scope of the invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a schematic diagram of a conventional backlight module; J is a schematic diagram of another conventional diffusion plate of FIG. 1A; and 2:糸 is a third diagram. A schematic diagram of a conventional diffusion plate; a schematic diagram of a backlight module and an optical diffusion plate for a planar light source according to the present invention; and a further embodiment of the invention And a schematic diagram of an optical diffuser plate for a planar light source. Main component symbol description '2, 3: backlight module 10, 1〇a, 10b: diffusing plate 11: substrate 12, 211: light-incident surface 13, 221 · light-emitting surface 11 200916835 14, 23: diffusion material 20, 30: Optical diffusing plates 21, 31: scattering layers 22, 32: first light transmitting layer 311: light incident plane 312: light exiting surface 321: light exiting plane 33: second light transmitting layer dl, d2: thickness I: interface II: convex curved surface L, L2: planar light source L21: light-emitting unit

Claims (1)

200916835 十、申請專利範圍： 1' 一種用於平面光源的光學擴散板，包括： 一散射層’具有一入光面朝向該平面光源；以及 一第一透光層，設置於該散射層上，且具有一出光 面遠離該平面光源，該散射層與該第一透光層連 接處形成一界面； 其中該界面的形狀係對應於該平面光源入射至該 散射層的輝度分佈。 2·如申請專利範圍第1項所述之光學擴散板，其中該 界面的形狀係正比於該平面光源入射至該散射層 的輝度分佈而對應設置。 3 •如申請專利範圍第1項所述之光學擴散板，其中該 界面的形狀係具有至少一凸曲面。 4·如申請專利範圍第3項所述之光學擴散板，其中該 凸曲面係為直條脊狀曲面、三角脊狀曲面、U型脊 狀曲面或橢圓曲面。 5 •如申請專利範圍第1項所述之光學擴散板，其中該 散射層内係包括至少一擴散材質。 •如申請專利範圍第5項所述之光學擴散板，其中該 ι擴散材質係均勻分佈於該散射層内。 •如申請專利範圍第5項所述之光學擴散板，其中該 才廣散材質的分佈密度係反比於該平面光源入射至 8 該入光面的輝度分佈。 如申晴專利範圍第5項所述之光學擴散板，其中該 13 200916835 擴散材質係選自二氧化鈦、二氧化矽 '滑石、雲母、 氧化鎂、硫酸鋇、硫化鋅及其組合所構成的群組。 9. 10. 11. 12. 13. 14. 15. 16. 如申請專利範圍第5項所述之光學擴散板，其中該 擴散材質的粒徑係介於0 05微米至2⑽微米之間。 如申請專利範圍第9項所述之光學擴散板，其中該 擴散材質的粒徑係介於〇·2微米至1〇微米之間/ 如申請專利範圍第1項所述之光學擴散板，其中該 政射層及该第一透光層的材質係為相同或不相同。 如申請專利範圍第丨項所述之光學擴散板，其更包 括一第二透光層，係鄰設該散射層之入光面。 如申請專利範圍第12項所述之光學擴散板，其中 該散射層、該第一透光層及該第二透光層的材質係 為相同或不相同。 如申請專利範圍第12項所述之光學擴散板，其中 f散射層、該第一透光層及該第二透光層的材質係 選自聚對苯二甲酸乙二酸酯、聚碳酸酯、聚乙烯、 聚亞乙稀、聚笨乙稀、壓克力樹脂、聚曱基丙婦酸 曱酉曰壓克力與聚丙烯共聚物、矽膠、橡膠或環氧 树月曰熱固型巯胺 '酚醛樹脂、石英、玻璃及其組 合所構成的群組。 ' 如申請專鄉圍第1或12項所述之光學擴散板， 其中該出光面係具有至少一微結構。 如I請專利範圍第15項所述之光學擴散板，其中 該U、、Ό構係為透鏡、稜鏡、多層膜或粗糙面。 14 200916835 17. 18. 19. 20. 21. 22. 23. 24. :申請專利範圍第i項所述之光學擴散板，其中該 ”面的形狀厚度變化係正比於該輝度分佈。 一種用於平面光源的光學擴散板’該平面光源具有 至^發光單元，該光學擴散板包括： 政射層，具有一入光平面及一連續非均勻厚度， 該入光平面係面對該發光單元；以及 一第一透光層，係設置於該散射層上，並具有一出 光平面遠離該發光單元； 其中该散射層的厚度分佈係正比於該發光單元入 射至該入光平面的輝度。 如申請專利範圍第18項所述之光學擴散板，其中 5亥政射層係具有至少一凸曲面。 如申請專利範圍第19項所述之光學擴散板，其中 4凸曲面係為直條脊狀曲面、三角脊狀曲面、u型 脊狀曲面或橢圓曲面。 如申凊專利範圍第18項所述之光學擴散板，其中 該散射層内係包括至少一擴散材質。 如申睛專利範圍第21項所述之光學擴散板，其中 該擴散材質係均勻分佈於該散射層内。 如申凊專利範圍第21項所述之光學擴散板，其中 該擴散材質的分佈密度係反比於該發光單元入射 至3亥入光平面的輝度分佈。 如申睛專利範圍第21項所述之光學擴散板，其中 該擴散材質係選自二氧化鈦、二氧化矽、滑石、雲 15 200916835 母、氧化鎂、硫酸鋇 25, 26. 27. 28. 29. 30. 、硫化鋅及其組合所構成的群 :::旁專利範圍第21項所述之光學擴散板，其中 该擴散材質的粒徑係介於G G5微米至 乎 間。 风木之 如申請專利範圍第25項所述之光學擴散板，其中 该擴散材質的粒徑係介於〇·2微米至10微米之 f申請專利範㈣18項所述之光學擴散板，其曰中 该散射層及該第—透光層的材質料相同或不相 同。 如申請f利範圍帛18項所述之光學擴散板，其更 包括一第二透光層，係鄰設該散射層之入光平面。 如申請專利_第28項所述之光學擴散板，其中 該散射層、該第-彡光層&該第二透光層的材質係 為相同或不相同。 f申請專利範圍第28項所述之光學擴散板，其中 f散射層、該第一透光層及該第二透光層的材質係 選自聚對笨二曱酸乙二酸酯、聚碳酸酯、聚乙烯、 聚亞乙烯、聚苯乙烯、壓克力樹脂、聚甲基丙烯酸 甲酉曰、壓克力與聚丙烯共聚物、矽膠、橡膠或環氧 树月θ熱固型疏胺、紛搭樹脂、石英、破璃及其組 合所構成的群組。 如申請專利範圍第18或28項所述之光學擴散板， 其中該出光平面係具有至少一微結構。 16 31. 200916835 32·如申請專利範圍第31項所述之光學擴散板，其中 該微結構係為透鏡、棱鏡、多層膜或粗糙面。 33_如申請專利範圍第18項所述之光學擴散板，其中 該發光單元係冷陰極螢光燈管、發光二極體或有機 發光二極體。 34. —種用於平面光源的光學擴散板，該平面光源具有 至少一發光單元，該光學擴散板包括： 一散射層，係設置於該發光單元之上，並具有—入 光平面及一出光曲面’該入光平面朝向該發光單 元；以及 一第一透光層’係設置於該出光曲面上，並具有一 出光平面遠離該發光單元； 其中該散射層之入光平面與該出光曲面的距離係 正比於該發光單元入射至該入光平面的輝度。 35. 如申請專利範圍第34項所述之光學擴散板，其中 該散射層沿著該出光曲面與該入光平面之間係具 有一連續非均勻厚度。 36. 如申請專利範圍第34項所述之光學擴散板，其中 該出光曲面係具有至少一凸曲面。 37·如申請專利範圍第％項所述之光學擴散板，其中 該凸曲面係為直條脊狀曲面、三角脊狀曲面、1；型 脊狀曲面或橢圓曲面。 38·如申請專利範圍第34項所述之光學擴散板，其中 该散射層内係包括至少一擴散材質。 17 200916835 39. 40. 41. 42. 43. 44. 45. 46. 47. 如申請專利範圍第1 弟38項所述之光學擴散板，其中 該擴散材質係均句分佈於該散射層内。 如申請專利範圍第38項所述之光學擴散板，其中 _散材f的分佈密度係反比於該光源人射至該 入光平面的輝度分佈。 如申請專利範圍第38項所述之光學擴散板，宜中 該擴散材質係選自二氧化鈦、二氧切、滑石、雲 母、氧化鎂、硫酸鋇、硫化鋅及其組合所構成的群 組0 如申胡專利範圍第38項所述之光學擴散板，其中 該擴散材質的粒徑係介於〇.〇5微米至200微米 間。 f申請專利範圍第42項所述之光學擴散板，其中 »亥擴政材吳的粒徑係介於〇2微米至丨〇微米之間。 =:明專利範圍第34項所述之光學擴散板，其中 5亥散射層及該第—透光層的材質係為相同或不相 同。 州 如申請專利範圍第34項所述之光學擴散板 第一透光層，係鄰設該散射層之入光平面。 請專利範圍第45項所述之光學擴散板，其中 5亥散射層、該第一透光層及該第二透光層的材質係 為相同或不相同。 、〜 如=凊專利範圍第45項所述之光學擴散板，其中 该散射層、該第一透光層及該第二透光層的材質係 18 200916835 k自♦對苯二甲酸乙二酸酯、聚碳酸酯、聚乙烯、 聚=乙細、聚苯乙歸、塵克力樹脂、聚甲基丙稀酸 :酉:、壓克力與聚丙烯共聚物、矽膠、橡膠或環氧 Μ月曰、熱固型巯胺、酚醛樹脂、石英、玻 合所構成的群組。 及其'、且 48. 49. 5〇. 利範圍第34或45項所述之光學擴散板， ” ο出光平面係具有至少一微結構。 如申請專利範圍第48項所述之光學擴散板， 該微結構係為透鏡、稜鏡、多層膜或粗糙面。 如t請專利範圍第34項所述之光學擴散板，其中 該”面的形狀厚度變化係正比於該輝度分佈。 19200916835 X. Patent Application Range: 1' An optical diffusing plate for a planar light source, comprising: a scattering layer having a light incident surface facing the planar light source; and a first light transmitting layer disposed on the scattering layer And having a light exiting surface away from the planar light source, the scattering layer forming an interface with the first light transmissive layer; wherein the shape of the interface corresponds to a luminance distribution of the planar light source incident on the scattering layer. The optical diffusing plate of claim 1, wherein the shape of the interface is correspondingly set to be proportional to a luminance distribution of the planar light source incident on the scattering layer. The optical diffusing plate of claim 1, wherein the shape of the interface has at least one convex curved surface. 4. The optical diffusing plate of claim 3, wherein the convex curved surface is a straight ridge curved surface, a triangular ridge curved surface, a U-shaped ridge curved surface or an elliptical curved surface. The optical diffusing plate of claim 1, wherein the scattering layer comprises at least one diffusion material. The optical diffusing plate of claim 5, wherein the ι diffusion material is uniformly distributed in the scattering layer. The optical diffusing plate of claim 5, wherein the distributed density of the material is inversely proportional to the luminance distribution of the planar light source incident on the light incident surface. The optical diffusing plate of claim 5, wherein the 13 200916835 diffusion material is selected from the group consisting of titanium dioxide, cerium oxide 'talc, mica, magnesium oxide, barium sulfate, zinc sulfide, and combinations thereof. . 9. The optical diffusing sheet of claim 5, wherein the diffusing material has a particle size ranging from 0 5 micrometers to 2 (10) micrometers. The optical diffusing plate of claim 9, wherein the diffusing material has a particle size ranging from 〇 2 μm to 1 μm / an optical diffusing plate according to claim 1 of the patent application, wherein The material of the political layer and the first light transmitting layer are the same or different. The optical diffusing plate of claim 2, further comprising a second light transmitting layer adjacent to the light incident surface of the scattering layer. The optical diffusing plate of claim 12, wherein the scattering layer, the first light transmitting layer and the second light transmitting layer are made of the same or different materials. The optical diffusing plate of claim 12, wherein the material of the f scattering layer, the first light transmitting layer and the second light transmitting layer is selected from the group consisting of polyethylene terephthalate and polycarbonate. , polyethylene, polyethylene, polystyrene, acrylic resin, polyacrylonitrile acrylate acrylate and polypropylene copolymer, silicone, rubber or epoxy tree enamel thermosetting 巯A group of amines 'phenolic resin, quartz, glass, and combinations thereof. The optical diffusing plate of claim 1 or 12, wherein the illuminating surface has at least one microstructure. The optical diffusing plate of claim 15, wherein the U, the Ό structure is a lens, a ruthenium, a multilayer film or a rough surface. 14 200916835 17. 18. 19. 20. 22. 22. 23. 24. The optical diffuser of claim i, wherein the shape thickness variation of the "face" is proportional to the luminance distribution. An optical diffusing plate of a planar light source having a light emitting unit, the optical diffusing plate comprising: an emissive layer having an incident light plane and a continuous non-uniform thickness, the light incident plane facing the light emitting unit; a first light transmissive layer is disposed on the scattering layer and has a light exiting plane away from the light emitting unit; wherein the thickness distribution of the scattering layer is proportional to the brightness of the light emitting unit incident on the light incident plane. The optical diffusing plate of the ninth aspect of the present invention, wherein the illuminating surface layer has a convex curved surface, wherein the optical diffusing plate according to claim 19, wherein the four convex curved surfaces are straight ridged curved surfaces, The optical diffusing plate according to claim 18, wherein the scattering layer comprises at least one diffusion material. The optical diffusing plate of claim 21, wherein the diffusing material is uniformly distributed in the scattering layer. The optical diffusing plate according to claim 21, wherein the diffusing material has a distribution density inversely proportional to the illuminating The optical diffusing plate according to claim 21, wherein the diffusing material is selected from the group consisting of titanium dioxide, cerium oxide, talc, cloud 15 200916835 mother, magnesium oxide, Barium sulphate 25, 26. 27. 28. 29. 30. A group consisting of zinc sulphide and a combination thereof. The optical diffusing plate of claim 21, wherein the particle size of the diffusing material is between G G5 micron to the same. The optical diffuser as described in claim 25, wherein the diffusion material has a particle size ranging from 微米 2 μm to 10 μm. The optical diffusing plate, wherein the scattering layer and the material of the first light transmitting layer are the same or different. The optical diffusing plate according to claim 18, further comprising a second light transmitting layer. Neighboring the scattering layer The optical diffusing plate of claim 28, wherein the scattering layer, the first light-emitting layer & the second light-transmitting layer are made of the same or different materials. The optical diffusing plate of item 28, wherein the material of the f scattering layer, the first light transmitting layer and the second light transmitting layer is selected from the group consisting of poly(p-phthalic acid oxalate), polycarbonate, and poly Ethylene, polyethylene, polystyrene, acrylic resin, polymethyl methacrylate, acrylic and polypropylene copolymer, silicone, rubber or epoxy tree θ thermosetting amide, varnish Group of quartz, broken glass and combinations thereof. The optical diffusing plate of claim 18 or 28, wherein the light exiting plane has at least one microstructure. The optical diffusing plate of claim 31, wherein the microstructure is a lens, a prism, a multilayer film or a rough surface. The optical diffusing plate of claim 18, wherein the light emitting unit is a cold cathode fluorescent lamp, a light emitting diode or an organic light emitting diode. An optical diffusing plate for a planar light source, the planar light source having at least one light emitting unit, the optical diffusing plate comprising: a scattering layer disposed on the light emitting unit and having an entrance light plane and a light output a curved surface of the light-emitting unit facing the light-emitting unit; and a first light-transmissive layer disposed on the light-emitting surface and having a light-emitting plane away from the light-emitting unit; wherein the light-incident plane of the scattering layer and the light-emitting surface The distance is proportional to the luminance of the light emitting unit incident on the light incident plane. The optical diffusing plate of claim 34, wherein the scattering layer has a continuous non-uniform thickness along the light exiting surface and the light entrance plane. 36. The optical diffuser of claim 34, wherein the light exiting surface has at least one convex curved surface. 37. The optical diffusing plate of claim 1 wherein the convex curved surface is a straight ridged curved surface, a triangular ridged curved surface, a type; a ridged curved surface or an elliptical curved surface. 38. The optical diffuser of claim 34, wherein the scattering layer comprises at least one diffusion material. 17 200916835 39. 40. 41. 42. 43. 44. 45. 46. 47. The optical diffuser of claim No. 38, wherein the diffusion material is uniformly distributed within the scattering layer. The optical diffusing plate of claim 38, wherein the distribution density of the scatter material f is inversely proportional to the luminance distribution of the light source to the light incident plane. The optical diffusing plate according to claim 38, wherein the diffusion material is selected from the group consisting of titanium dioxide, dioxane, talc, mica, magnesia, barium sulfate, zinc sulfide, and combinations thereof. The optical diffusing plate of claim 38, wherein the diffusing material has a particle size ranging from 5 μm to 200 μm. f. The optical diffusing plate described in claim 42 of the patent scope, wherein the particle size of the _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The optical diffusing plate of claim 34, wherein the material of the 5th scattering layer and the first light transmitting layer are the same or different. The first light-transmissive layer of the optical diffuser as described in claim 34 of the patent application is adjacent to the light-input plane of the scattering layer. The optical diffusing plate of claim 45, wherein the material of the 5 scattering layer, the first light transmitting layer and the second light transmitting layer are the same or different. The optical diffusing plate of claim 45, wherein the scattering layer, the first light transmitting layer and the second light transmitting layer are made of 18 200916835 k ♦ phthalic acid oxalic acid Ester, polycarbonate, polyethylene, poly = fine, polystyrene, dusty resin, polymethyl acrylate: 酉:, acrylic and polypropylene copolymer, silicone, rubber or epoxy oxime A group consisting of lunar enamel, thermosetting guanamine, phenolic resin, quartz, and glass. And the optical diffusing plate of the invention, wherein the optical light diffusing plate has at least one microstructure. The optical diffusing plate according to claim 48 of the patent application is disclosed in claim 48. The microstructure is a lens, a crucible, a multilayer film, or a rough surface. The optical diffusing plate of claim 34, wherein the shape thickness variation of the "face" is proportional to the luminance distribution. 19
TW96137371A 2007-10-05 2007-10-05 Optical diffuser for flat light source TW200916835A (en)

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TW96137371A TW200916835A (en) 2007-10-05 2007-10-05 Optical diffuser for flat light source

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TW96137371A TW200916835A (en) 2007-10-05 2007-10-05 Optical diffuser for flat light source

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI610434B (en) * 2013-01-09 2018-01-01 三星顯示器有限公司 Display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI610434B (en) * 2013-01-09 2018-01-01 三星顯示器有限公司 Display device

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