TW201804228A - Light source module and display - Google Patents
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- TW201804228A TW201804228A TW105122575A TW105122575A TW201804228A TW 201804228 A TW201804228 A TW 201804228A TW 105122575 A TW105122575 A TW 105122575A TW 105122575 A TW105122575 A TW 105122575A TW 201804228 A TW201804228 A TW 201804228A
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Abstract
Description
本發明是有關於一種電子裝置，且特別是有關於一種光源模組以及顯示裝置。The present invention relates to an electronic device, and more particularly to a light source module and a display device.
一般而言，背光模組可區分成直下式背光模組以及側入式背光模組。側入式背光模組通常包括光源以及導光板，其中光源設置在導光板的側邊。自光源射出的光束從導光板的側邊入射進導光板後可於導光板中傳遞，並且由導光板的出光面發出。相較於直下式背光模組，側入式背光模組可減少光源中發光元件的使用量，從而具有低耗電的優勢。In general, the backlight module can be divided into a direct type backlight module and a side-in type backlight module. The side-entry backlight module generally includes a light source and a light guide plate, wherein the light source is disposed at a side of the light guide plate. The light beam emitted from the light source is incident on the light guide plate from the side of the light guide plate, and is transmitted through the light guide plate, and is emitted from the light exit surface of the light guide plate. Compared with the direct type backlight module, the side-in type backlight module can reduce the usage of the light-emitting elements in the light source, thereby having the advantage of low power consumption.
應用於側入式背光模組的導光板主要由聚碳酸酯(PC)或聚甲基丙烯酸甲酯(PMMA)等材質製作，這類材質會在信賴性測試過程中經常產生色變或是澎潤。因此，開發出玻璃材質的導光板來克服上述問題。並且，玻璃導光板上可為了增強擴散效果而設置網點。反射片或光學膜材料使用光學膠(OCA)貼合在玻璃導光板上時，會因光學膠填補網點而使得入射光無法在導光板內進行全反射，這造成入射光無法有效率的在導光板中傳遞，導致導光板上遠離入射光源的區域有著較低的亮度及亮度分散不平均的問題。The light guide plate used in the side-entry backlight module is mainly made of polycarbonate (PC) or polymethyl methacrylate (PMMA). Such materials often cause color change or 澎 during the reliability test. Run. Therefore, a light guide plate made of glass material has been developed to overcome the above problems. Moreover, the glass light guide plate can be provided with a dot to enhance the diffusion effect. When the reflective sheet or the optical film material is bonded to the glass light guide plate by using an optical adhesive (OCA), the optical light fills the mesh point, so that the incident light cannot be totally reflected in the light guide plate, which causes the incident light to be inefficiently guided. The light plate is transmitted, resulting in a problem of low brightness and uneven brightness dispersion in the area of the light guide plate away from the incident light source.
本發明提供一種光源模組，其有助於提升光線在導光板中傳遞的效率、整體厚度降低並且可減少信賴性測試造成的導光板變異。The invention provides a light source module, which helps to improve the efficiency of light transmission in the light guide plate, the overall thickness reduction and the variation of the light guide plate caused by the reliability test.
本發明提供一種顯示裝置，其具有良好的顯示品質。The present invention provides a display device having good display quality.
本發明的實施例的一種光源模組，其包括導光板、光學膠層、反射片、低折射率膜層及發光元件。導光板具有出光面、與出光面相對的底面以及連接出光面與底面的入光面。光學膠層與底面接觸。反射片具有一反射面，且反射面面向導光板的底面。低折射率膜層形成於反射面與光學膠層之間，其中導光板的折射率為n1、光學膠層的折射率為n2且低折射率膜層的折射率為n3。n1大於n3而n2不大於n1。發光元件設置於導光板的一側，其中發光元件朝入光面發光。A light source module according to an embodiment of the present invention includes a light guide plate, an optical adhesive layer, a reflective sheet, a low refractive index film layer, and a light emitting element. The light guide plate has a light-emitting surface, a bottom surface opposite to the light-emitting surface, and a light-incident surface that connects the light-emitting surface and the bottom surface. The optical adhesive layer is in contact with the bottom surface. The reflective sheet has a reflective surface, and the reflective surface faces the bottom surface of the light panel. The low refractive index film layer is formed between the reflective surface and the optical adhesive layer, wherein the refractive index of the light guide plate is n1, the refractive index of the optical adhesive layer is n2, and the refractive index of the low refractive index film layer is n3. N1 is greater than n3 and n2 is no greater than n1. The light emitting element is disposed on one side of the light guide plate, wherein the light emitting element emits light toward the light incident surface.
本發明的實施例的一種顯示裝置，其包括上述的光源模組以及顯示面板，其中顯示面板配置於出光面上。A display device according to an embodiment of the present invention includes the above-described light source module and a display panel, wherein the display panel is disposed on the light emitting surface.
在本發明的一實施例中，n2大於n3。In an embodiment of the invention, n2 is greater than n3.
在本發明的一實施例中，n1等於n2。In an embodiment of the invention, n1 is equal to n2.
在本發明的一實施例中，n1大於n2。In an embodiment of the invention, n1 is greater than n2.
在本發明的一實施例中，n2等於n3。In an embodiment of the invention, n2 is equal to n3.
在本發明的一實施例中，1.5≦n1≦1.7。In an embodiment of the invention, 1.5 ≦ n1 ≦ 1.7.
在本發明的一實施例中，1.3≦n2≦1.7。In an embodiment of the invention, 1.3≦n2≦1.7.
在本發明的一實施例中，1.1≦n3≦1.3。In an embodiment of the invention, 1.1 ≦ n3 ≦ 1.3.
在本發明的一實施例中，上述的導光板為玻璃材質導光板。In an embodiment of the invention, the light guide plate is a glass material light guide plate.
在本發明的一實施例中，上述的導光板為塑膠材質導光板。In an embodiment of the invention, the light guide plate is a plastic light guide plate.
在本發明的一實施例中，上述的反射片為白色反射片或金屬反射片。In an embodiment of the invention, the reflective sheet is a white reflective sheet or a metal reflective sheet.
在本發明的一實施例中，上述的低折射率膜層的厚度落在1μm至50μm的範圍。In an embodiment of the invention, the thickness of the low refractive index film layer described above falls within the range of 1 μm to 50 μm.
在本發明的一實施例中，上述的低折射率膜層的材質包括有機絕緣材料、無機絕緣材料、導電氧化物或其組合。In an embodiment of the invention, the material of the low refractive index film layer comprises an organic insulating material, an inorganic insulating material, a conductive oxide or a combination thereof.
在本發明的一實施例中，上述的光學膠層的厚度落在5μm至250μm的範圍。In an embodiment of the invention, the thickness of the optical adhesive layer described above falls within the range of 5 μm to 250 μm.
在本發明的一實施例中，上述的光學膠層的厚度落在5μm至50μm的範圍。In an embodiment of the invention, the thickness of the optical adhesive layer described above falls within the range of 5 μm to 50 μm.
在本發明的一實施例中，上述的顯示裝置更包括至少一光學膜片配置於導光板與顯示面板之間。In an embodiment of the invention, the display device further includes at least one optical film disposed between the light guide plate and the display panel.
基於上述，在本發明的實施例的光源模組中，導光板、光學膠層與反射片上的低折射率膜層的折射率間的匹配，有助於在導光板、光學膠層與低折射率膜層中相鄰兩者的交界處形成全反射，以更可以有效提高光源模組的光利用率以及出光均勻性。在至少部分實施例中，反射片透過光學膠與導光板貼合，使反射片不需使用額外的基材或外殼體來固定，從而使整體厚度降低。此外，導光板上的光學膜可用貼合的方式固定在導光板上，不易因信賴性測試的熱風影響而浮起並導致捲曲。另外，本發明的實施例的顯示裝置應用上述光源模組而可具有良好的顯示品質。Based on the above, in the light source module of the embodiment of the present invention, the matching between the refractive indexes of the light guide plate, the optical adhesive layer and the low refractive index film layer on the reflective sheet contributes to the light guide plate, the optical adhesive layer and the low refraction. The total reflection is formed at the junction of the adjacent two layers in the film layer, so that the light utilization efficiency and the light uniformity of the light source module can be effectively improved. In at least some embodiments, the reflective sheet is bonded to the light guide plate through the optical adhesive, so that the reflective sheet is not required to be fixed by using an additional substrate or outer casing, thereby reducing the overall thickness. In addition, the optical film on the light guide plate can be fixed on the light guide plate by laminating, and it is not easy to float due to the hot air of the reliability test and cause curling. In addition, the display device of the embodiment of the present invention can have good display quality by applying the above-described light source module.
為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。The above described features and advantages of the invention will be apparent from the following description.
圖1是依照本發明的第一實施例的一種光源模組的剖面示意圖。請先參照圖1，光源模組100包括導光板110、光學膠層120、反射片130、低折射率膜層140以及發光元件150。導光板110具有出光面SE、底面SB以及入光面SI，其中底面SB與出光面SE相對，且入光面SI連接出光面SE與底面SB。導光板110的材質包括玻璃、聚甲基丙烯酸甲酯(PMMA)或聚碳酸酯(PC)。導光板110的出光面SE以及底面SB的其中至少一者上可以形成有多個導光微結構或多個網點，但不以此為限。1 is a schematic cross-sectional view of a light source module in accordance with a first embodiment of the present invention. Referring to FIG. 1 , the light source module 100 includes a light guide plate 110 , an optical adhesive layer 120 , a reflective sheet 130 , a low refractive index film layer 140 , and a light emitting element 150 . The light guide plate 110 has a light emitting surface SE, a bottom surface SB, and a light incident surface SI. The bottom surface SB is opposite to the light emitting surface SE, and the light incident surface SI is connected to the light surface SE and the bottom surface SB. The material of the light guide plate 110 includes glass, polymethyl methacrylate (PMMA) or polycarbonate (PC). A plurality of light guiding microstructures or a plurality of dots may be formed on at least one of the light emitting surface SE and the bottom surface SB of the light guide plate 110, but not limited thereto.
光學膠層120接觸底面SB設置，且光學膠層120位於低折射率膜層140與導光板110之間。在本實施例中，光學膠層120可塗佈或設置在導光板110的底面SB上，使得底面SB位於光學膠層120與出光面SE之間。以本實施例來說，光學膠層120是用以將導光板110與其上設置有低折射率膜層140的反射片130貼附在一起。The optical adhesive layer 120 is disposed in contact with the bottom surface SB, and the optical adhesive layer 120 is located between the low refractive index film layer 140 and the light guide plate 110. In this embodiment, the optical adhesive layer 120 can be coated or disposed on the bottom surface SB of the light guide plate 110 such that the bottom surface SB is located between the optical adhesive layer 120 and the light exit surface SE. In the present embodiment, the optical adhesive layer 120 is used to attach the light guide plate 110 to the reflective sheet 130 on which the low refractive index film layer 140 is disposed.
光學膠層120的材質可包括一般折射率光學膠或低折射率光學膠，其中一般折射率光學膠的折射率與玻璃材料接近，而低折射率光學膠則是折射率低於玻璃材料。光學膠(optical clear adhesive, OCA)此類材料具有無色透明、光穿透率高及膠聯強度良好的特性，能夠使導光板110與反射片130貼合。因此，光源模組100不需使用額外基材或外殼體來固定導光板110與反射片130，而有助於降低整體厚度。在一實施例中，一般折射率光學膠的材質例如為壓克力系化合物，而低折射率光學膠的材質包括例如鐵氟龍系化合物、氟系化合物或其他具有類似性質的材料。另外，光學膠層120的厚度H1可以藉由需要的條件來調整。若厚度H1不足，會降低光學膠層120的黏合性質，使導光板110與反射片130不易牢固地貼合在一起或黏合效果不能持久。反之，厚度H1過厚時，會對光造成損耗，而使光能損耗。本實施例的光學膠層120的厚度H1例如落在5μm至250μm的範圍。在部分實施例中，光學膠層120的厚度H1可以落在5μm至50μm的範圍，這樣的厚度設計可以兼具足夠的黏合牢固性及降低光損耗的效果。The material of the optical adhesive layer 120 may include a general refractive index optical adhesive or a low refractive index optical adhesive, wherein the refractive index of the general refractive index optical adhesive is close to that of the glass material, and the refractive index of the low refractive index optical adhesive is lower than that of the glass material. Optical clear adhesive (OCA) materials have the characteristics of colorless transparency, high light transmittance, and good bonding strength, and the light guide plate 110 and the reflection sheet 130 can be bonded together. Therefore, the light source module 100 does not need to use an additional substrate or an outer casing to fix the light guide plate 110 and the reflective sheet 130, thereby helping to reduce the overall thickness. In one embodiment, the material of the general refractive index optical adhesive is, for example, an acrylic compound, and the material of the low refractive index optical adhesive includes, for example, a Teflon-based compound, a fluorine-based compound, or other materials having similar properties. In addition, the thickness H1 of the optical adhesive layer 120 can be adjusted by the required conditions. If the thickness H1 is insufficient, the adhesive property of the optical adhesive layer 120 is lowered, so that the light guide plate 110 and the reflective sheet 130 are not easily adhered together or the bonding effect cannot be sustained. On the other hand, when the thickness H1 is too thick, light is lost and light energy is lost. The thickness H1 of the optical adhesive layer 120 of the present embodiment falls, for example, in the range of 5 μm to 250 μm. In some embodiments, the thickness H1 of the optical adhesive layer 120 may fall within the range of 5 μm to 50 μm, and such a thickness design can have sufficient adhesion fastness and an effect of reducing light loss.
反射片130具有一反射面SR，且反射面SR面向導光板110的底面SB。反射片130設置在光學膠層120遠離導光板110的一側，其適於反射自底面SB射出導光板110的光，使光有機會再次回到導光板110中，進而提升光的利用率。舉例而言，反射片130可以是白色反射片或金屬反射片。金屬反射片例如是銀反射片或鋁反射片，但不以此為限。The reflection sheet 130 has a reflection surface SR, and the reflection surface SR faces the bottom surface SB of the light guide plate 110. The reflective sheet 130 is disposed on a side of the optical adhesive layer 120 away from the light guide plate 110, and is adapted to reflect light emitted from the bottom surface SB to the light guide plate 110, so that the light has a chance to return to the light guide plate 110 again, thereby improving the utilization of light. For example, the reflective sheet 130 may be a white reflective sheet or a metal reflective sheet. The metal reflective sheet is, for example, a silver reflective sheet or an aluminum reflective sheet, but is not limited thereto.
低折射率膜層140形成於反射片130上，且表面形成有低折射率膜層140的反射片130以低折射率膜層140位於反射片130與導光板110之間的方式藉由光學膠層120貼附於導光板110上。在本實施例中，低折射率膜層140形成在反射片130的反射面SR上，使得光學膠層120位於低折射率膜層140與導光板110的底面SB之間。The low refractive index film layer 140 is formed on the reflective sheet 130, and the reflective sheet 130 having the low refractive index film layer 140 formed on the surface thereof is disposed by the optical adhesive in such a manner that the low refractive index film layer 140 is located between the reflective sheet 130 and the light guide plate 110. The layer 120 is attached to the light guide plate 110. In the present embodiment, the low refractive index film layer 140 is formed on the reflective surface SR of the reflective sheet 130 such that the optical adhesive layer 120 is positioned between the low refractive index film layer 140 and the bottom surface SB of the light guide plate 110.
低折射率膜層140的材質可包括有機絕緣材料、無機絕緣材料、導電氧化物或其組合。在其他實施例中，低折射率膜層140的材質也可為具有奈米孔洞結構的氧化矽、氧化銦錫或高分子材料。低折射率膜層140可透過濺鍍或塗佈等方式形成於反射面SR上，且低折射率膜層140是由折射率小於導光板110、光學膠層120或兩者的折射率的材質所形成。舉例而言，低折射率膜層140的材質例如包括聚四氟乙烯(Polytetrafluoroethene, Teflon)。當低折射率膜層140的厚度H2過薄時，可能發生薄膜干涉現象，而薄膜干涉會破壞光源模組100的出光效果而與預期不符。厚度H2過厚時，介質的穿透性會對光造成損耗，因而減低亮度。本實施例的低折射率膜層140的厚度H2可以落在1μm至50μm的範圍，這有助於兼具減少薄膜干涉現象及降低光損耗的效果。在部分實施例中，低折射率膜層140的厚度H2可以落在5μm至25μm，1μm至5μm或是5μm至10μm的範圍內，以達到需要的出光效果。The material of the low refractive index film layer 140 may include an organic insulating material, an inorganic insulating material, a conductive oxide, or a combination thereof. In other embodiments, the material of the low refractive index film layer 140 may also be yttrium oxide, indium tin oxide or a polymer material having a nanopore structure. The low refractive index film layer 140 can be formed on the reflective surface SR by sputtering or coating, and the low refractive index film layer 140 is made of a material having a refractive index smaller than that of the light guide plate 110, the optical adhesive layer 120, or both. Formed. For example, the material of the low refractive index film layer 140 includes, for example, polytetrafluoroethene (Teflon). When the thickness H2 of the low refractive index film layer 140 is too thin, a film interference phenomenon may occur, and the film interference may damage the light emitting effect of the light source module 100 and is inconsistent with expectations. When the thickness H2 is too thick, the permeability of the medium causes loss of light, thereby reducing the brightness. The thickness H2 of the low refractive index film layer 140 of the present embodiment may fall within the range of 1 μm to 50 μm, which contributes to the effect of reducing the film interference phenomenon and reducing the optical loss. In some embodiments, the thickness H2 of the low refractive index film layer 140 may fall within the range of 5 μm to 25 μm, 1 μm to 5 μm, or 5 μm to 10 μm to achieve a desired light-emitting effect.
發光元件150配置在入光面SI旁，其適於提供光束L0，且光束L0自入光面SI進入導光板110。導光板110的底面SB可設置有導光微結構或網點(未繪示)以提供散射作用，從而讓光束L0進入導光板110後可自導光板110的出光面SE射出，並形成照明所需的面光源。具體而言，發光元件150可包括一燈管或是一或多個發光二極體，其中燈管的延伸方向或發光二極體的排列方向可以平行於入光面SI的延伸方向。The light emitting element 150 is disposed beside the light incident surface SI, which is adapted to provide the light beam L0, and the light beam L0 enters the light guide plate 110 from the light incident surface SI. The bottom surface SB of the light guide plate 110 may be provided with light guiding microstructures or dots (not shown) to provide scattering, so that the light beam L0 can enter the light guiding plate 110 and be emitted from the light emitting surface SE of the light guiding plate 110, and is required for illumination. Surface light source. Specifically, the light-emitting element 150 may include a light tube or one or more light-emitting diodes, wherein the extending direction of the light tube or the arrangement direction of the light-emitting diodes may be parallel to the extending direction of the light-incident surface SI.
依據不同的設計需求，光源模組100可進一步包括其他元件。舉例而言，光源模組100可進一步包括至少一光學膜片(未繪示)。光學膜片可用貼合方式固定於導光板110的出光面SE的上方且可包括擴散片以及稜鏡片的其中至少一者，但不以此為限。The light source module 100 may further include other components according to different design requirements. For example, the light source module 100 can further include at least one optical film (not shown). The optical film may be fixed to the light-emitting surface SE of the light guide plate 110 by a bonding manner and may include at least one of the diffusion sheet and the cymbal sheet, but is not limited thereto.
以下透過圖1說明導光板110、光學膠層120以及低折射率膜層140的折射率的關係。由圖1可知，發光元件150發出的光束L0進入導光板110後，可能朝各種方向行進。導光板110內朝向底面SB行進的光束L1如果未被反射回導光板110，將無法射出出光面SE而導致光源模組100的光利用率不佳。同時，導光板110內朝向底面SB行進的光束L1被反射回導光板110可有助於光束L1在導光板110內遠離發光元件150行進而達到在光源模組100需要的出光效果(即導光板110的整個出光面SE都有光發出且均勻地發出。The relationship between the refractive indices of the light guide plate 110, the optical adhesive layer 120, and the low refractive index film layer 140 will be described below with reference to FIG. As can be seen from FIG. 1, after the light beam L0 emitted from the light-emitting element 150 enters the light guide plate 110, it may travel in various directions. If the light beam L1 traveling toward the bottom surface SB in the light guide plate 110 is not reflected back to the light guide plate 110, the light output surface SE may not be emitted, resulting in poor light utilization efficiency of the light source module 100. At the same time, the light beam L1 traveling toward the bottom surface SB of the light guide plate 110 is reflected back to the light guide plate 110 to facilitate the light beam L1 to travel away from the light-emitting element 150 in the light guide plate 110 to achieve the light-emitting effect required by the light source module 100 (ie, the light guide plate). The entire light exiting surface SE of the light 110 emits light and is emitted uniformly.
一般來說，當光從光密介質(較高折射率的介質)進入到光疏介質(較低折射率的介質)，且入射角大於臨界角時會發生內部全反射。此時，理論上光的反射率可以接近100%。進一步而言，當光從折射率高的第一介質進入折射率低且相鄰的第二介質，若入射角小於臨界角，光線同時發生向第二介質中的折射，以及向第一介質中的反射。In general, internal total reflection occurs when light enters a light-diffusing medium (a medium of lower refractive index) into a light-diffusing medium (a medium of lower refractive index) and the incident angle is greater than the critical angle. At this time, the reflectance of light can theoretically approach 100%. Further, when the light enters the second medium having a low refractive index and is adjacent from the first medium having a high refractive index, if the incident angle is smaller than the critical angle, the light simultaneously refracts into the second medium and into the first medium. Reflection.
在圖1的架構下，導光板110的折射率為n1、光學膠層120的折射率為n2、低折射率膜層140的折射率為n3，且n1＞n2＞n3。舉例來說，1.5≦n1≦1.7、1.3≦n2≦1.7且1.1≦n3≦1.3。在部分實施例中，光學膠層120的折射率可以為1.3≦n2≦1.5。不過，本實施例不以上述數值為限。在此，低折射率膜層140的折射率低於光學膠層120的折射率，且光學膠層120的折射率低於導光板110的折射率。導光板110與光學膠層120之間的交界處以及光學膠層120及低折射率膜層140的交界處都可能發生全反射。In the architecture of FIG. 1, the refractive index of the light guide plate 110 is n1, the refractive index of the optical adhesive layer 120 is n2, the refractive index of the low refractive index film layer 140 is n3, and n1>n2>n3. For example, 1.5≦n1≦1.7, 1.3≦n2≦1.7, and 1.1≦n3≦1.3. In some embodiments, the optical adhesive layer 120 may have a refractive index of 1.3 ≦ n 2 ≦ 1.5. However, the present embodiment is not limited to the above numerical values. Here, the refractive index of the low refractive index film layer 140 is lower than the refractive index of the optical adhesive layer 120, and the refractive index of the optical adhesive layer 120 is lower than the refractive index of the light guide plate 110. Total reflection may occur at the interface between the light guide plate 110 and the optical adhesive layer 120 and at the boundary between the optical adhesive layer 120 and the low refractive index film layer 140.
具體來說，光束L1在光學膠層120與導光板110之交界處的入射角大於臨界角時，光束L1可反射回導光板110。反射回來的光束L2可以繼續在導光板110中行進。光束L1在光學膠層120與導光板110之交界處的入射角小於臨界角時，光束L1可進入光學膠層120。進入光學膠層120的光束L3朝向低折射率膜層140行進時，若光束L3在光學膠層120與低折射率膜層140之交界處的入射角大於臨界角，則會被反射回光學膠層120。在光學膠層120內的光束L4可以由底面SB再進入導光板110。因此，在n1＞n2＞n3的設置下，可減少光從導光板110中射入低折射率的光學膠層120及低折射率膜層140，並讓光容易從低折射率的光學膠層120及低折射率膜層140入射回導光板110，使光源模組100具有良好的光利用效率。同時，由於反射回來的光束L2與光束L4都是朝向遠離發光元件150的方向行進，這有助於提升光源裝置100在遠離發光元件150處的發光亮度而達到更均勻的面光源出光效果。Specifically, when the incident angle of the light beam L1 at the boundary between the optical adhesive layer 120 and the light guide plate 110 is greater than a critical angle, the light beam L1 may be reflected back to the light guide plate 110. The reflected light beam L2 can continue to travel in the light guide plate 110. When the incident angle of the light beam L1 at the boundary between the optical adhesive layer 120 and the light guide plate 110 is less than the critical angle, the light beam L1 can enter the optical adhesive layer 120. When the light beam L3 entering the optical adhesive layer 120 travels toward the low refractive index film layer 140, if the incident angle of the light beam L3 at the boundary between the optical adhesive layer 120 and the low refractive index film layer 140 is greater than the critical angle, it will be reflected back to the optical adhesive. Layer 120. The light beam L4 in the optical adhesive layer 120 can be re-entered into the light guide plate 110 from the bottom surface SB. Therefore, under the setting of n1>n2>n3, light can be reduced from the light guide plate 110 into the low refractive index optical adhesive layer 120 and the low refractive index film layer 140, and the light can be easily removed from the low refractive index optical adhesive layer. 120 and the low refractive index film layer 140 are incident on the light guide plate 110, so that the light source module 100 has good light utilization efficiency. At the same time, since the reflected light beam L2 and the light beam L4 both travel in a direction away from the light emitting element 150, this helps to improve the light emitting brightness of the light source device 100 away from the light emitting element 150 to achieve a more uniform surface light emitting effect.
另外，當相鄰的兩個介質的折射率差值越大的時候，根據司乃耳定律(Snell’s Law)，臨界角的角度會越小，使得越多角度的光可以被全反射。因此，在一實施例中，除了n1＞n2＞n3外，n1與n2的差值以及n2與n3之間的差值可以根據需要的全反射效果來調整。In addition, when the difference in refractive index between two adjacent media is larger, according to Snell's Law, the angle of the critical angle is smaller, so that more angles of light can be totally reflected. Therefore, in an embodiment, the difference between n1 and n2 and the difference between n2 and n3 may be adjusted according to the required total reflection effect, except that n1>n2>n3.
以下藉由圖2至圖3說明光源模組的其他實施型態，其中相同或相似的元件以相同或相似的標號表示，於下便不再贅述。圖2至圖3分別是依照本發明的第二實施例至第三實施例的光源模組的剖面示意圖。請參照圖2，光源模組200相似於圖1的光源模組100，且光源模組200包括導光板210、光學膠層220、反射片230、低折射率膜層240以及發光元件250。導光板210、光學膠層220、反射片230、低折射率膜層240以及發光元件250彼此的配置關係可以參照圖1的實施例中導光板110、光學膠層120、反射片130、低折射率膜層140以及發光元件150的配置關係，而不另贅述。不過，圖1與圖2的實施例兩者的主要差異在於，在本實施例的光源模組200中導光板210的折射率約等於光學膠層220的折射率，且光學膠層220的折射率大於低折射率膜層的折射率。也就是說，導光板210的折射率為n1、光學膠層220的折射率為n2、低折射率膜層240的折射率為n3，其關係可表示為n1=n2＞n3，或是n1≈n2＞n3。本實施例的光學膠層220材質可為一般光學膠，且折射率落在1.4≦n2≦1.5的範圍。光學膠層220的折射率與導光板210的折射率近似，使光可從導光板210進入光學膠層220，然而光在由光學膠層220進入折射率較小的低折射率膜層240時容易形成全反射，而引導光返回導光板210中，藉此提升光的分散性及光的利用率。Other embodiments of the light source module are described below with reference to FIGS. 2 to 3, wherein the same or similar elements are designated by the same or similar reference numerals and will not be described again. 2 to 3 are schematic cross-sectional views of a light source module according to second to third embodiments of the present invention, respectively. Referring to FIG. 2 , the light source module 200 is similar to the light source module 100 of FIG. 1 , and the light source module 200 includes a light guide plate 210 , an optical adhesive layer 220 , a reflective sheet 230 , a low refractive index film layer 240 , and a light emitting element 250 . For the arrangement relationship between the light guide plate 210, the optical adhesive layer 220, the reflective sheet 230, the low refractive index film layer 240, and the light emitting element 250, reference may be made to the light guide plate 110, the optical adhesive layer 120, the reflective sheet 130, and the low refractive index in the embodiment of FIG. The arrangement relationship of the film layer 140 and the light-emitting element 150 is not described again. However, the main difference between the embodiment of FIG. 1 and FIG. 2 is that the refractive index of the light guide plate 210 in the light source module 200 of the embodiment is approximately equal to the refractive index of the optical adhesive layer 220, and the refractive index of the optical adhesive layer 220. The rate is greater than the refractive index of the low refractive index film layer. That is, the refractive index of the light guide plate 210 is n1, the refractive index of the optical adhesive layer 220 is n2, and the refractive index of the low refractive index film layer 240 is n3, and the relationship can be expressed as n1=n2>n3, or n1≈ N2>n3. The material of the optical adhesive layer 220 of this embodiment may be a general optical adhesive, and the refractive index falls within the range of 1.4≦n2≦1.5. The refractive index of the optical adhesive layer 220 is similar to the refractive index of the light guide plate 210, so that light can enter the optical adhesive layer 220 from the light guide plate 210, but when the light enters the low refractive index film layer 240 having a small refractive index from the optical adhesive layer 220. It is easy to form total reflection, and the guided light is returned to the light guide plate 210, thereby improving the dispersion of light and the utilization of light.
請參照圖3，光源模組300相似於圖1的光源模組100，且光源模組300包括導光板310、光學膠層320、反射片330、低折射率膜層340以及發光元件350。導光板310、光學膠層320、反射片330、低折射率膜層340以及發光元件350彼此的配置關係可以參照圖1的實施例中導光板110、光學膠層120、反射片130、低折射率膜層140以及發光元件150的配置關係，而不另贅述。不過，圖1與圖3的實施例兩者的主要差異在於，在本實施例的光源模組300中光學膠層320的折射率約等於低折射率膜層340的折射率，且導光板210的折射率大於光學膠層320的折射率。也就是說，導光板310的折射率為n1、光學膠層320的折射率為n2、低折射率膜層340的折射率為n3，其關係可表示為n1＞n2=n3，或是n1＞n2≈n3。本實施例的光學膠層320材質可為低折射率光學膠，且折射率落在1.3≦n2≦1.5的範圍。光學膠層320的折射率與低折射率膜層340的折射率近似且導光板310的折射率大於光學膠層320的折射率。如此，光從導光板310中朝向折射率較小的光學膠層320及低折射率膜層340行進時，在導光板310與被全反射的機率較大，因而更有效率的在導光板310內傳遞。此外，折射進入光學膠層320的光可透過反射片330被反射回導光板310，進而引導光在導光板310中行進，藉此提升光的分散性及光的利用率。Referring to FIG. 3 , the light source module 300 is similar to the light source module 100 of FIG. 1 , and the light source module 300 includes a light guide plate 310 , an optical adhesive layer 320 , a reflective sheet 330 , a low refractive index film layer 340 , and a light emitting element 350 . For the arrangement relationship between the light guide plate 310, the optical adhesive layer 320, the reflective sheet 330, the low refractive index film layer 340, and the light emitting element 350, reference may be made to the light guide plate 110, the optical adhesive layer 120, the reflective sheet 130, and the low refractive index in the embodiment of FIG. The arrangement relationship of the film layer 140 and the light-emitting element 150 is not described again. However, the main difference between the embodiment of FIG. 1 and FIG. 3 is that the refractive index of the optical adhesive layer 320 in the light source module 300 of the present embodiment is approximately equal to the refractive index of the low refractive index film layer 340, and the light guide plate 210 The refractive index is greater than the refractive index of the optical adhesive layer 320. That is, the refractive index of the light guide plate 310 is n1, the refractive index of the optical adhesive layer 320 is n2, and the refractive index of the low refractive index film layer 340 is n3, and the relationship can be expressed as n1>n2=n3, or n1> N2≈n3. The material of the optical adhesive layer 320 of this embodiment may be a low refractive index optical adhesive, and the refractive index falls within the range of 1.3 ≦ n 2 ≦ 1.5. The refractive index of the optical adhesive layer 320 is similar to the refractive index of the low refractive index film layer 340 and the refractive index of the light guide plate 310 is greater than the refractive index of the optical adhesive layer 320. As described above, when the light travels from the light guide plate 310 toward the optical adhesive layer 320 and the low refractive index film layer 340 having a small refractive index, the probability of total reflection on the light guide plate 310 is large, and thus the light guide plate 310 is more efficiently used. Pass inside. In addition, the light refracted into the optical adhesive layer 320 can be reflected back to the light guide plate 310 through the reflective sheet 330, thereby guiding the light to travel in the light guide plate 310, thereby improving the dispersion of light and the utilization of light.
圖4呈現在相同發光元件下，光在具有低折射率膜層與不具有低折射率膜層的光源模組的傳遞效果的示意圖。請參照圖1及圖4，範例光源模組EX與對比光源模組CEX具有相同的發光元件、導光板、反射片與光學膠層的設置關係，且圖4呈現出發光元件的設置方位以及光的行進方向D1。具體而言，範例光源模組EX與對比光源模組CEX中，發光元件、導光板、反射片與光學膠層的設置關係可參照圖1中發光元件150、導光板110、反射片130與光學膠層120的設置關係。同時，在範例光源模組EX與對比光源模組CEX中，光學膠層的設置厚度皆為50μm。另外，範例光源模組EX具有圖1中的低折射率膜層140，而對比光源模組CEX則無。4 is a schematic diagram showing the transfer effect of light under a light-emitting module having a low refractive index film layer and a light source module having no low refractive index film layer under the same light-emitting element. Referring to FIG. 1 and FIG. 4, the example light source module EX and the contrast light source module CEX have the same arrangement relationship of the light-emitting elements, the light guide plate, the reflection sheet and the optical glue layer, and FIG. 4 shows the arrangement orientation of the light-emitting elements and the light. The direction of travel D1. Specifically, in the example light source module EX and the contrast light source module CEX, the arrangement relationship between the light-emitting element, the light guide plate, the reflection sheet and the optical adhesive layer can refer to the light-emitting element 150, the light guide plate 110, the reflection sheet 130 and the optical in FIG. The setting relationship of the glue layer 120. Meanwhile, in the example light source module EX and the contrast light source module CEX, the optical adhesive layer is set to have a thickness of 50 μm. In addition, the example light source module EX has the low refractive index film layer 140 of FIG. 1, and the comparative light source module CEX has no.
由圖4可知，在相同光源下，在未設置低折射率膜層的對比光源模組CEX下，除了整體的出光亮度較低外，離光源較遠處的亮度也有偏低的現象，且出光亮度的分布不平均。在設置低折射率膜層的範例光源模組EX下，整體的出亮度較明亮外，出光亮度的分布也較平均，且明亮的面積明顯較為大而呈現較為均勻一致的反射率。As can be seen from Fig. 4, under the same light source, in the contrast light source module CEX where the low refractive index film layer is not provided, in addition to the overall light output brightness is low, the brightness far from the light source is also low, and the light is emitted. The distribution of brightness is not uniform. Under the example light source module EX with a low refractive index film layer, the overall brightness is brighter, the distribution of light output brightness is also average, and the bright area is obviously larger and exhibits a more uniform reflection rate.
圖5是依照本發明第四實施例的顯示裝置的剖面示意圖。請參照圖5，上述光源模組100、200、300可應用於顯示裝置400中。具體地，顯示裝置400可包括導光板410、光學膠層420、反射片430、低折射率膜層440、發光元件450以及顯示面板460。導光板410、光學膠層420、反射片430、低折射率膜層440以及發光元件450彼此的配置關係可以參照圖1的實施例中導光板110、光學膠層120、反射片130、低折射率膜層140以及發光元件150的配置關係，而不另贅述。在部分實施例中，顯示裝置400可更包括配置於導光板410與顯示面板460之間的光學膜片470。光學膜片470於顯示面板460鄰近出光面SE設置，例如顯示面板460位於出光面SE上方。光學膜片470可包括擴散片、增亮片(DBEF)以及稜鏡片的其中至少一者，但不以此為限。光學膜片470配置在導光板410上具有調整出光波長、出光角度或光行進的方向，進而改善出光的效果，使得導光板410、光學膠層420、反射片430、低折射率膜層440以及發光元件450構成的光源模組具有均勻的出光亮度或出光顏色。Figure 5 is a cross-sectional view showing a display device in accordance with a fourth embodiment of the present invention. Referring to FIG. 5 , the light source modules 100 , 200 , and 300 can be applied to the display device 400 . Specifically, the display device 400 may include a light guide plate 410, an optical adhesive layer 420, a reflective sheet 430, a low refractive index film layer 440, a light emitting element 450, and a display panel 460. The arrangement relationship between the light guide plate 410, the optical adhesive layer 420, the reflective sheet 430, the low refractive index film layer 440, and the light emitting element 450 may refer to the light guide plate 110, the optical adhesive layer 120, the reflective sheet 130, and the low refractive index in the embodiment of FIG. The arrangement relationship of the film layer 140 and the light-emitting element 150 is not described again. In some embodiments, the display device 400 may further include an optical film 470 disposed between the light guide plate 410 and the display panel 460. The optical film 470 is disposed adjacent to the light emitting surface SE of the display panel 460. For example, the display panel 460 is located above the light emitting surface SE. The optical film 470 may include at least one of a diffusion sheet, a brightness enhancement sheet (DBEF), and a cymbal sheet, but is not limited thereto. The optical film 470 is disposed on the light guide plate 410 to adjust the light wavelength, the light exit angle, or the direction in which the light travels, thereby improving the light output effect, such that the light guide plate 410, the optical adhesive layer 420, the reflective sheet 430, the low refractive index film layer 440, and The light source module formed by the light-emitting element 450 has uniform light-emitting brightness or light-emitting color.
導光板410在進行信賴性測試的過程中如果發生質變或澎潤，將會導致設置於導光板410上的光學膜片470無法平貼在導光板410的表面上，而產生捲曲。因此，本實施例的顯示裝置400可以採用玻璃材質製作導光板410，並將光學膜片470用貼合方式固定於導光板410與顯示面板460之間。如此，光學膜片470在測試過程中能穩定地平貼於導光板410，而避免捲曲的現象。本實施例的顯示裝置400具有良好的光源模組，使得光可以均勻的由出光面SE發出，使顯示面板460可以平均的受到光照而有良好的顯示品質。If the light guide plate 410 undergoes a qualitative change or a turbulence during the reliability test, the optical film 470 disposed on the light guide plate 410 may not be flat on the surface of the light guide plate 410 to cause curling. Therefore, in the display device 400 of the present embodiment, the light guide plate 410 can be made of a glass material, and the optical film 470 can be fixed between the light guide plate 410 and the display panel 460 by a bonding method. Thus, the optical film 470 can be stably flattened to the light guide plate 410 during the test, and the phenomenon of curling is avoided. The display device 400 of the present embodiment has a good light source module, so that the light can be uniformly emitted from the light-emitting surface SE, so that the display panel 460 can receive illumination with an average of good display quality.
綜上所述，在本發明的實施例的光源模組中，導光板、光學膠層與反射片上的低折射率膜層的折射率間的匹配，搭配光學膠層與低折射率膜層的厚度，有助於在導光板、光學膠層與低折射率膜層中相鄰兩者的交界處形成全反射介面，以更可以有效提高光源模組的光利用率以及出光均勻性。在至少部分實施例中，反射片透過光學膠與導光板貼合，使反射片不需使用額外的基材或外殼體來固定，從而使整體厚度降低。此外，導光板上的光學膜可用貼合的方式固定在導光板上，不易因信賴性測試的熱風影響而浮起並導致捲曲。另外，本發明的實施例的顯示裝置應用上述光源模組而可具有良好的顯示品質。In summary, in the light source module of the embodiment of the present invention, the matching between the refractive indexes of the light guide plate, the optical adhesive layer and the low refractive index film layer on the reflective sheet is matched with the optical adhesive layer and the low refractive index film layer. The thickness helps to form a total reflection interface at the intersection of the adjacent two of the light guide plate, the optical adhesive layer and the low refractive index film layer, so as to effectively improve the light utilization efficiency and light uniformity of the light source module. In at least some embodiments, the reflective sheet is bonded to the light guide plate through the optical adhesive, so that the reflective sheet is not required to be fixed by using an additional substrate or outer casing, thereby reducing the overall thickness. In addition, the optical film on the light guide plate can be fixed on the light guide plate by laminating, and it is not easy to float due to the hot air of the reliability test and cause curling. In addition, the display device of the embodiment of the present invention can have good display quality by applying the above-described light source module.
雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.
100、200、300‧‧‧光源模組
110、210、310、410‧‧‧導光板
120、220、320、420‧‧‧光學膠層
130、230、330‧‧‧反射片
140、240、340‧‧‧低折射率膜層
150、250、350、450‧‧‧發光元件
400‧‧‧顯示裝置
460‧‧‧顯示面板
470‧‧‧光學膜片
CEX‧‧‧對比光源模組
D1‧‧‧光的行進方向
EX‧‧‧範例光源模組
H1、H2‧‧‧厚度
L0、L1、L2、L3、L4‧‧‧光束
SB‧‧‧底面
SE‧‧‧出光面
SI‧‧‧入光面
SR‧‧‧反射面100, 200, 300‧‧‧ light source module
110, 210, 310, 410‧‧‧ light guide plates
120, 220, 320, 420‧‧ ‧ optical adhesive layer
130, 230, 330‧‧‧ reflection film
140, 240, 340‧‧‧ low refractive index film
150, 250, 350, 450‧‧‧Lighting elements
400‧‧‧ display device
460‧‧‧ display panel
470‧‧‧Optical diaphragm
CEX‧‧‧ contrast light source module
D1‧‧‧The direction of light travel
EX‧‧‧ Example Light Source Module
H1, H2‧‧‧ thickness
L0, L1, L2, L3, L4‧‧‧ beams
SB‧‧‧ bottom
SE‧‧‧Glossy
SI‧‧‧Into the glossy surface
SR‧‧‧reflecting surface
圖1是依照本發明的第一實施例的一種光源模組的剖面示意圖。 圖2是依照本發明的第二實施例的一種光源模組的剖面示意圖。 圖3是依照本發明的第三實施例的一種光源模組的剖面示意圖。 圖4表示光源模組在相同光源下，光在設置有低折射率膜層以及無低折射率膜層的擴散效果的示意圖。 圖5是依照本發明的第四實施例的一種顯示裝置的剖面示意圖。1 is a schematic cross-sectional view of a light source module in accordance with a first embodiment of the present invention. 2 is a cross-sectional view of a light source module in accordance with a second embodiment of the present invention. 3 is a cross-sectional view of a light source module in accordance with a third embodiment of the present invention. Fig. 4 is a view showing the diffusion effect of light in a light source module with a low refractive index film layer and no low refractive index film layer under the same light source. Figure 5 is a cross-sectional view showing a display device in accordance with a fourth embodiment of the present invention.
100‧‧‧光源模組 100‧‧‧Light source module
110‧‧‧導光板 110‧‧‧Light guide plate
120‧‧‧光學膠層 120‧‧‧Optical adhesive layer
130‧‧‧反射片 130‧‧‧reflector
140‧‧‧低折射率膜層 140‧‧‧Low-refractive-index film
150‧‧‧發光元件 150‧‧‧Lighting elements
H1、H2‧‧‧厚度 H1, H2‧‧‧ thickness
L0、L1、L2、L3、L4‧‧‧光束 L0, L1, L2, L3, L4‧‧‧ beams
SB‧‧‧底面 SB‧‧‧ bottom
SE‧‧‧出光面 SE‧‧‧Glossy
SI‧‧‧入光面 SI‧‧‧Into the glossy surface
SR‧‧‧反射面 SR‧‧‧reflecting surface
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| KR20200118009A (en) * | 2018-02-02 | 2020-10-14 | 닛토덴코 가부시키가이샤 | LED backlight film, LED backlight |
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| TWM363599U (en) * | 2009-01-20 | 2009-08-21 | Yu Hsi Technology Co Ltd | Three-layer type light-guiding structure |
| TWI434084B (en) * | 2010-07-23 | 2014-04-11 | Entire Technology Co Ltd | Uniform reflective light-guide apparatus, and a backlight module and an lcd device having the same |
| JP6157827B2 (en) * | 2012-09-28 | 2017-07-05 | 恵和株式会社 | Light guide sheet, edge light type backlight unit and laptop computer |
| JP6293415B2 (en) * | 2013-02-25 | 2018-03-14 | 恵和株式会社 | Light guide film, ultra-thin LCD backlight unit and portable computer |
| TWI533040B (en) * | 2013-07-01 | 2016-05-11 | 元太科技工業股份有限公司 | Display device |
| CN105546483B (en) * | 2014-10-30 | 2018-09-18 | 纬创资通股份有限公司 | Light guide module with gradual index lens and backlight module |
| CN105182463A (en) * | 2015-08-14 | 2015-12-23 | 深圳市华星光电技术有限公司 | Light guide plate and display apparatus |
| CN205374943U (en) * | 2016-02-03 | 2016-07-06 | 北京京东方显示技术有限公司 | Backlight module and display device |
-
2016
- 2016-07-18 TW TW105122575A patent/TWI587052B/en not_active IP Right Cessation
-
2017
- 2017-03-10 CN CN201710141074.0A patent/CN107631204A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN107631204A (en) | 2018-01-26 |
| TWI587052B (en) | 2017-06-11 |
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| MM4A | Annulment or lapse of patent due to non-payment of fees |