200825465 九、發明說明： 胃【發明所屬之技術領域】 . 本發明涉及一種背光模組用之光學板，尤其涉及一種複 合式光學板。 【先前技術】 液晶顯示裝置被廣泛應用於個人數位助理、筆記型電 腦、數位相機、移動電話、液晶電視等電子産品中。但由於 液晶顯示裝置本身不能發光，故其需要借助背光模組才能産 生顯示功能。 請參見圖1，一種採用習知技術之光學板之背光模組剖 面示意圖。該背光模組10包括反射板11與依次設置於反射 板11上方之複數光源12、擴散板13及稜鏡片15。擴散板 13内一般含有曱基丙烯酸甲酯微粒，該曱基丙烯酸曱酯微粒 作爲擴散粒子用於使光線發生擴散。棱鏡片15具有V形微 稜鏡結構，用於提高背光模組特定視角範圍内之亮度。使用 、時，由才旻數光源12產生之光線進入擴散板13被均勻擴散 後，其繼續進入稜鏡片15，於稜鏡片15之V形微稜鏡結構 之作用下使出射光線發生一定程度之聚集作用，以提高背光 模組於特定視角範圍内之亮度。 然而，習知技術中擴散板13與稜鏡片15係分別製備， 這使得擴散板13與稜鏡片15之間相互獨立，使用時，儘管 擴散板13與稜鏡片15可緊密接觸，但其間仍會有細微之空 氣阻隔層存在；當光線於擴散板13與稜鏡片15之間進行傳 播而通過該空氣阻隔層時，光線容易於空氣阻隔層與擴散板 200825465 13及稜鏡片15之間之介面發生介面反射等作用，使光能量 -消耗與損失增大，從而降低光線之利用率。 -【發明内容】 鑒於上述狀況，有必要提供一種可提高光線利用率之光 學板。 一種光學板，其包括一體成型之第一透明層、擴散層及 第二透明層，該擴散層位於該第一透明層與第二透明層之 間，該擴散層包含透明樹脂與分散於該透明樹脂内之擴散粒 f % 子，該第一透明層與第二透明層相對該擴散層之外表面均具 有複數長條狀V形凸起。 相對於習知技術，所述光學板包括一體成型之第一透明 層、第二透明層及擴散層，該第一透明層與該第二透明層相 對該擴散層之外表面均具有複數長條狀V形凸起，談擴散層 包含透明樹脂與分散於該透明樹脂内之擴散粒子。使用時， 光線首先進入該光學板之其中一透明層並被該透明層發 散，然後光線再通過該光學板之擴散層被擴散均勻，最後便 直接進入另一透明層並藉由該透明層發生聚集作用。如此， 光線從入射光學板至出射，其間光線無需再經過空氣層，從 而讓光線發生介面損耗之介面數量減少，光傳輸損失降低。 故，上述光學板具有易於提高光線利用率之優點。 【實施方式】 下面將結合附圖及複數實施例對光學板做進一步詳細 說明。 請一併參見圖2、圖3及圖4，光學板20包括一體成型 7 200825465 ί!:!明層21、擴散層22及第二透明層23，即藉由模且 ^出成型形成第-透明層21，再於第—透明層2射出、 里解，第一透明層21、擴散層22、第二 樹二成順序亦可作適當改變。擴散層22包含透明 、# 與以於該透明樹脂221内之擴散粒子223。第一 ^明：21與第二透明層23相對該擴散層22之外表面均且 長條狀V形凸起211與加，位於同-透明層之複數 =狀v形凸起成連續緊密排佈，且第二透明層23 長條狀V形凸起231之& β # 條狀V形凸起211之=='一透明層21之複數長 擴散層22與第二透二佈透明層21、 古业 日3之尽度可分別大於或等於0.35 但更佳優選地’帛—透明層21、擴散層22與第二透 日23之厚度之和爲1〇5毫米至6毫米。 第透明層21與第二透明層23可由透明樹脂材料形 ’例如㈣酸樹脂、聚碳_旨樹脂、聚苯乙烯樹脂與苯乙 ^甲基丙烯酸甲賴脂中之—種或—種以上之混合物。並 ，第一透明層21與第二透明層23之材料可以相同，亦可 =不同’即第-透明層21可選用一種透明樹脂材料，而第 —透明層23可選用另一種透明樹脂材料。 第一透明層21之長條狀v形凸起211與第二透明層23 =長條狀V形凸起231均從相應透明層之一端延伸至相對之 另一端。相鄰兩長條狀V形凸起之間距範圍爲0.025毫米至 8 200825465 1毫米，每個長條狀V形凸起之頂角0之取值範圍可爲60 •度至120度。使用時，不同之長條狀V形凸起之頂角0值可 .使採用該光學板20之背光模組具有不同之亮度與視角。 光學板20之擴散層22用於使入射光線擴散均勻，藉由 調整透明樹脂221與擴散粒子223之比列，可使其具有30% 至98%之光穿透率。透明樹脂221可爲丙烯酸樹脂、聚碳酸 酯樹脂、聚苯乙烯樹脂與苯乙烯-甲基丙烯酸曱酯樹脂中之 一種或一種以上之混合物。擴散粒子223可爲二氧化鈦微 f 粒、二氧化矽微粒和丙烯酸樹脂微粒中之一種或一種以上之 混合物。擴散粒子223可將光線擴散均勻，其作用可類似於 習知技術中之擴散板中擴散粒子之作用。另，該擴散層22 與第一透明層21及第二透明層23相連接之兩連接面爲光滑 面。 當第一透明層21作爲光學板20之入光侧，光線首先進 入光學板20之第一透明層21並被其長條狀V形凸起211發 、散，然後光線再通過光學板20之擴散層22被擴散均勻，最 後便直接進入第二透明層23並達到其長條狀V形凸起 231，藉由長條狀V形凸起231發生聚集作用。如此，光線 從入射光學板20至出射，其間光線無需再經過空氣層，從 而讓光線發生介面損耗之介面數量減少，故易於使光線能量 損失降低，提高光線之利用率。並且，第一透明層21增加 了對光之發散作用，可使得採用該光學板20之背光模組易 具有較高之出光均勻性。 此外，光學板20應用於背光模組組裝時，只需要安裝 200825465 一片光學板20即可，相對擴散板與稜鏡片之背光模組組裝， *提升了組裝作業之效率。另，光學板20將習知技術之擴散 -板與稜鏡片之功能複合於一起，縮小了習知技術中擴散板與 棱鏡片共同佔用之空間，故更易於滿足産品輕、薄、短、小 之市場發展需求。 請參見圖5，本發明第二實施例光學板60之剖面示意 圖。該第二實施例光學板60與第一實施例光學板20不同的 係，該光學板60之第一透明層61與擴散層62之連接面爲 複合曲面，其具有複數與第二透明層63之長條狀V形凸起 相同之結構。可以理解，該光學板60之第二透明層63與擴 散層62之連接面亦可爲複合曲面，其亦可具有複數與第一 透明層61之長條狀V形凸起相同之結構。並且，連接面還 可爲其他結構之複合曲面。 可以理解，上述光學板之第二透明層之複數長條狀V 形凸起之排佈方向與第一透明層之複數長條狀V形凸起之 排佈方向可以相同，亦可不同，即兩個排佈方向之夾角範圍 可爲0到90度。調整兩排佈方向之夾角之大小，可使得採 用該光學板之背光模組具有不同之視覺範圍與亮度值。並 且，複數長條狀V形凸起亦可成間隔排佈，但複數長條狀V 形凸起爲間隔排佈時對光之作用效果與連續緊密排佈時略 有差異。另，第一透明層之長條狀V形凸起之頂角值大小與 第二透明層之長條狀V形凸起之頂角值大小可以相同，亦可 不同；其可依據採用該光學板之背光模組之實際情況作適當 調整。 10 200825465 綜上所述，本發明符合發明專利要件，爰依法提出專利 ‘申請。惟，以上所述者僅為本發明之較佳實施例，舉凡熟悉 ▲本案技藝之人士，在爰依本發明精神所作之等效修飾或變 化，皆應涵蓋於以下之申請專利範圍内。 【圖式簡單說明】 圖1係一種採用習知技術之光學板之背光模組之剖面 不意圖。 圖2係本發明光學板較佳實施例一之立體示意圖。 圖3係圖2所示光學板沿線III-III之剖面示意圖。 圖4係圖2所示光學板沿線IV-IV之剖面示意圖。 圖5係本發明光學板較佳實施例二之剖面示意圖。 【主要元件符號說明】 (本發明） 光學板 20、60 第一透明層 21、61 長條狀V形凸起 211 、 231 擴散層 22、62 透明樹脂 221 擴散粒子 223 第二透明層 23 > 63 知） 背光模組 10 反射板 11 光源 12 π 13 200825465 擴散板 15 棱鏡片 12200825465 IX. INSTRUCTIONS: Stomach [Technical Field of the Invention] The present invention relates to an optical plate for a backlight module, and more particularly to a composite optical plate. [Prior Art] Liquid crystal display devices are widely used in electronic products such as personal digital assistants, notebook computers, digital cameras, mobile phones, and LCD TVs. However, since the liquid crystal display device itself cannot emit light, it needs to use a backlight module to produce a display function. Referring to Fig. 1, a schematic cross-sectional view of a backlight module using an optical plate of the prior art. The backlight module 10 includes a reflecting plate 11 and a plurality of light sources 12, a diffusing plate 13 and a cymbal 15 which are sequentially disposed above the reflecting plate 11. The diffusion plate 13 generally contains mercapto acrylate fine particles which are used as diffusion particles for diffusing light. The prism sheet 15 has a V-shaped micro 稜鏡 structure for improving the brightness of the backlight module within a specific viewing angle range. When used, when the light generated by the digital light source 12 is uniformly diffused into the diffusing plate 13, it continues to enter the cymbal 15 to cause the emitted light to a certain extent under the action of the V-shaped micro-twist structure of the cymbal 15. Aggregation to increase the brightness of the backlight module over a specific viewing angle range. However, in the prior art, the diffusion plate 13 and the cymbal 15 are separately prepared, which makes the diffusion plate 13 and the cymbal 15 independent of each other. In use, although the diffusion plate 13 and the cymbal 15 can be in close contact, There is a fine air barrier layer; when light passes between the diffusion plate 13 and the cymbal 15 and passes through the air barrier layer, the light is easily generated by the interface between the air barrier layer and the diffusion plate 200825465 13 and the cymbal 15 Interface reflection and other effects increase light energy consumption and loss, thereby reducing the utilization of light. - [Invention] In view of the above situation, it is necessary to provide an optical board that can improve light utilization. An optical plate comprising an integrally formed first transparent layer, a diffusion layer and a second transparent layer, the diffusion layer being located between the first transparent layer and the second transparent layer, the diffusion layer comprising a transparent resin and being dispersed in the transparent layer The diffusion particles f% in the resin, the first transparent layer and the second transparent layer have a plurality of elongated V-shaped protrusions on the outer surface of the diffusion layer. In contrast to the prior art, the optical plate includes an integrally formed first transparent layer, a second transparent layer, and a diffusion layer, and the first transparent layer and the second transparent layer have a plurality of strips on the outer surface of the diffusion layer. A V-shaped projection, the diffusion layer comprising a transparent resin and diffusion particles dispersed in the transparent resin. In use, the light first enters one of the transparent layers of the optical plate and is diverged by the transparent layer, and then the light is diffused uniformly through the diffusion layer of the optical plate, and finally directly enters another transparent layer and occurs through the transparent layer. Aggregation. In this way, the light passes from the incident optical plate to the exit, and the light does not need to pass through the air layer, so that the number of interfaces for light interface loss is reduced, and the optical transmission loss is reduced. Therefore, the above optical plate has an advantage that it is easy to improve light utilization efficiency. [Embodiment] Hereinafter, an optical plate will be further described in detail with reference to the accompanying drawings and the plural embodiments. Referring to FIG. 2, FIG. 3 and FIG. 4 together, the optical plate 20 includes an integrally formed 7200825465 ί!:! bright layer 21, a diffusion layer 22 and a second transparent layer 23, which are formed by molding and forming a first- The transparent layer 21 is further emitted and resolved in the first transparent layer 2, and the order of the first transparent layer 21, the diffusion layer 22, and the second tree may be appropriately changed. The diffusion layer 22 includes a transparent, # and diffusion particles 223 in the transparent resin 221. First, the second transparent layer 23 and the second transparent layer 23 are opposite to the outer surface of the diffusion layer 22, and the strip-shaped V-shaped protrusions 211 are added, and the plurality of v-shaped protrusions in the same-transparent layer are continuously and closely arranged. Cloth, and the second transparent layer 23 of the strip-shaped V-shaped protrusion 231 & β # strip-shaped V-shaped protrusion 211 == 'a transparent layer 21 of the plurality of long diffusion layer 22 and the second transparent layer of transparent layer 21. The degree of the ancient business day 3 may be greater than or equal to 0.35, respectively. More preferably, the sum of the thickness of the transparent layer 21, the diffusion layer 22 and the second day 23 is from 1 mm to 6 mm. The first transparent layer 21 and the second transparent layer 23 may be formed of a transparent resin material such as (four) acid resin, polycarbon resin, polystyrene resin, and phenethyl methacrylate thyme. mixture. Moreover, the materials of the first transparent layer 21 and the second transparent layer 23 may be the same or different. That is, the first transparent layer 21 may be made of a transparent resin material, and the first transparent layer 23 may be made of another transparent resin material. The elongated v-shaped projection 211 of the first transparent layer 21 and the second transparent layer 23 = elongated V-shaped projection 231 extend from one end of the corresponding transparent layer to the opposite end. The distance between two adjacent strip-shaped V-shaped protrusions ranges from 0.025 mm to 8 200825465 1 mm, and the apex angle 0 of each elongated V-shaped protrusion can range from 60 degrees to 120 degrees. When used, the apex angle 0 of different strip-shaped V-shaped protrusions can make the backlight module using the optical board 20 have different brightness and viewing angle. The diffusion layer 22 of the optical plate 20 serves to diffuse the incident light uniformly, and by adjusting the ratio of the transparent resin 221 to the diffusion particles 223, it can have a light transmittance of 30% to 98%. The transparent resin 221 may be a mixture of one or more of an acrylic resin, a polycarbonate resin, a polystyrene resin, and a styrene-methacrylic acid methacrylate resin. The diffusion particles 223 may be a mixture of one or more of titanium dioxide micro-f particles, cerium oxide particles, and acrylic resin particles. The diffusing particles 223 diffuse the light uniformly, and its action can be similar to that of the diffusing particles in the diffusing plate in the prior art. Further, the connecting faces of the diffusion layer 22 and the first transparent layer 21 and the second transparent layer 23 are smooth surfaces. When the first transparent layer 21 serves as the light incident side of the optical plate 20, the light first enters the first transparent layer 21 of the optical plate 20 and is emitted and scattered by the elongated V-shaped protrusions 211, and then the light passes through the optical plate 20. The diffusion layer 22 is uniformly diffused, and finally enters the second transparent layer 23 and reaches its elongated V-shaped projection 231, which is aggregated by the elongated V-shaped projections 231. In this way, the light exits from the incident optical plate 20, and the light does not need to pass through the air layer, so that the number of interfaces for the interface loss of the light is reduced, so that the light energy loss is easily reduced, and the utilization of the light is improved. Moreover, the first transparent layer 21 increases the divergence effect on the light, so that the backlight module using the optical plate 20 can easily have higher light uniformity. In addition, when the optical board 20 is applied to the assembly of the backlight module, only one optical plate 20 of 200825465 needs to be installed, and the backlight module of the diffusing plate and the cymbal piece is assembled, and the efficiency of the assembly work is improved. In addition, the optical plate 20 combines the functions of the diffusion-plate and the cymbal of the prior art, and reduces the space occupied by the diffusion plate and the prism piece in the prior art, so that it is easier to satisfy the product light, thin, short, and small. Market development needs. Referring to Figure 5, there is shown a cross-sectional view of an optical plate 60 in accordance with a second embodiment of the present invention. The optical plate 60 of the second embodiment is different from the optical plate 20 of the first embodiment. The connecting surface of the first transparent layer 61 and the diffusion layer 62 of the optical plate 60 is a composite curved surface having a plurality of transparent layers 63. The long strip-shaped V-shaped projections have the same structure. It can be understood that the connecting surface of the second transparent layer 63 and the diffusion layer 62 of the optical plate 60 may also be a composite curved surface, and may have a plurality of structures identical to the long V-shaped projections of the first transparent layer 61. Moreover, the joint surface can also be a composite surface of other structures. It can be understood that the arrangement direction of the plurality of elongated V-shaped protrusions of the second transparent layer of the optical plate and the arrangement direction of the plurality of long V-shaped protrusions of the first transparent layer may be the same or different, that is, The angle between the two arrangement directions can range from 0 to 90 degrees. Adjusting the angle between the two rows of orientations allows the backlight module using the optical panel to have different visual range and brightness values. Moreover, the plurality of long V-shaped projections may be arranged at intervals, but the effect of the plurality of elongated V-shaped projections on the light arrangement is slightly different from that of the continuous tight arrangement. In addition, the apex angle value of the long V-shaped protrusion of the first transparent layer may be the same as or different from the apex angle of the long V-shaped protrusion of the second transparent layer; The actual situation of the backlight module of the board is appropriately adjusted. 10 200825465 In summary, the present invention complies with the requirements of the invention patent, and patents are filed according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art in the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view of a backlight module using an optical plate of the prior art. 2 is a perspective view of a preferred embodiment 1 of the optical plate of the present invention. Figure 3 is a schematic cross-sectional view of the optical plate of Figure 2 taken along line III-III. Figure 4 is a schematic cross-sectional view of the optical plate of Figure 2 taken along line IV-IV. Figure 5 is a cross-sectional view showing a preferred embodiment 2 of the optical sheet of the present invention. [Main component symbol description] (Invention) Optical plate 20, 60 First transparent layer 21, 61 elongated V-shaped projection 211, 231 diffusion layer 22, 62 transparent resin 221 diffusion particle 223 second transparent layer 23 > 63 know) backlight module 10 reflector 11 light source 12 π 13 200825465 diffuser 15 prism sheet 12