TW201326925A - Microstructure light guide plate and edge type backlight module - Google Patents
Microstructure light guide plate and edge type backlight module Download PDFInfo
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本發明是有關於一種微結構導光板及一種側光式背光模組，該微結構導光板兼具聚光效果且能在表面產生霧化遮瑕效果，以達到微結構導光板外觀佳的目的；而該側光式背光模組包含該微結構導光板，可減少印刷油墨用量，減少保護膜的使用，以達到降低成本的目的。The invention relates to a microstructure light guide plate and an edge light type backlight module. The microstructure light guide plate has a concentrating effect and can generate an atomization concealing effect on the surface, so as to achieve a good appearance of the microstructure light guide plate; The edge-lit backlight module comprises the microstructured light guide plate, which can reduce the amount of printing ink and reduce the use of the protective film to achieve the purpose of reducing cost.
參閱圖1，為一種已知的導光板(Light Guide Plate) 1，在背光模組中所扮演的是關鍵的光導引媒介，應用於側光式(Edge Type)背光模組，可導引光線方向、提高面板的光輝度及控制亮度均勻。而目前用於液晶顯示裝置(LCD)之背光源的導光板1為印刷式導光板，即利用含有高發散光線物質的印刷材料，適當地分布於該導光板1的一內面11而形成陣列式印刷結構12，藉由印刷材料將對光線吸收再擴散放出的性質，破壞全反射效應造成的內部傳播，使光線由一個相反於該內面11的正面13射出並均勻分布於發光區。Referring to FIG. 1, a known light guide plate 1 plays a key light guiding medium in a backlight module, and is applied to an edge type backlight module. Light direction, improve the brightness of the panel and control the brightness evenly. At present, the light guide plate 1 used for the backlight of the liquid crystal display device (LCD) is a printed light guide plate, that is, a printed material containing a highly divergent light material is appropriately distributed on an inner surface 11 of the light guide plate 1 to form an array. The printed structure 12, by the printing material, absorbs and re-diffuses the light, and destroys the internal propagation caused by the total reflection effect, so that the light is emitted from a front surface 13 opposite to the inner surface 11 and uniformly distributed in the light-emitting area.
但因此種印刷式導光板1的印刷點亮度對比較高，一般在使用時必須搭配擴散膜來霧化遮瑕，以及使用稜鏡片來集光以達到其光學與外觀要求，導致增加背光模組的成本；並且此種印刷式導光板1具有印刷結構12之均一性不易控制及印刷油墨黏度不易控制等缺點。而且油墨的成本高，如不能減少印刷油墨的用量，將造成導光板1的製造成本較高。另外也因為該導光板1的內面11為平面設計，一旦被刮傷將會產生明顯的刮痕，因此已知導光板1製作完成後，還必須額外使用保護膜覆蓋該內面11來保護。However, the printing brightness of the printed light guide plate 1 is relatively high, and generally must be used with a diffusion film to atomize the concealer, and the use of the enamel film to collect light to achieve its optical and appearance requirements, resulting in an increase in the backlight module. Cost; and such a printed light guide plate 1 has the disadvantages that the uniformity of the printed structure 12 is not easy to control and the viscosity of the printing ink is not easily controlled. Moreover, the cost of the ink is high, and if the amount of printing ink cannot be reduced, the manufacturing cost of the light guide plate 1 is high. In addition, since the inner surface 11 of the light guide plate 1 is designed in a plane, once scratched, a significant scratch will be generated. Therefore, after the light guide plate 1 is completed, it is necessary to additionally cover the inner surface 11 with a protective film to protect it. .
而另一種導光板即微結構導光板，其是在導光板的出光面設置一特殊形狀之微結構，例如三角柱狀透鏡(prism lens)、弧形柱狀透鏡(lenticular lens)等，上述微結構設計的目的在於破壞全反射條件而使光線導出，但此種微結構導光板用於背光模組中，雖可節省稜鏡片的使用，但因為該導光板的內面為平面設計，一旦被刮傷將會產生明顯的刮痕，也還必須額外使用保護膜覆蓋該內面來保護。Another type of light guide plate, that is, a microstructure light guide plate, is a microstructure having a special shape, such as a prism lens, a lenticular lens, etc., on the light exit surface of the light guide plate, and the above microstructure The purpose of the design is to destroy the total reflection condition and let the light be led out. However, the micro-structure light guide plate is used in the backlight module, which can save the use of the cymbal, but since the inner surface of the light guide plate is a flat design, once it is scraped The injury will result in significant scratches and must be additionally covered with a protective film to protect the inside.
因此，本發明之目的，即在提供一種可減少導光板的印刷油墨用量及保護膜的使用、並可降低製造成本的微結構導光板，以及使用此微結構導光板的側光式背光模組。Accordingly, it is an object of the present invention to provide a microstructure light guide plate which can reduce the amount of printing ink used for a light guide plate and the use of a protective film, and can reduce the manufacturing cost, and an edge light type backlight module using the same. .
於是，本發明之一種微結構導光板，包含：一出光面、一表面粗糙的內面，以及一連接於該出光面與該內面的一側的入光面。Therefore, a microstructure light guide plate of the present invention comprises: a light exit surface, a rough surface inner surface, and a light incident surface connected to the light exit surface and the inner surface.
該出光面具有數個微結構，每一個微結構的高度H為60~150μm，微結構的節距為P，且H/P為0.25~0.5。該內面位於該出光面的相反側，該內面包括一個表面具有一印刷結構的第一區域，以及一個表面不具有印刷結構的第二區域，該第二區域佔該內面的面積為大於或等於45%且小於100%，該第二區域的平均粗糙度大於0.33μm且小於或等於0.6μm。The light-emitting surface has a plurality of microstructures, each of which has a height H of 60 to 150 μm, a microstructure of a pitch of P, and an H/P of 0.25 to 0.5. The inner surface is located on the opposite side of the light-emitting surface, the inner surface includes a first region having a printed structure on the surface, and a second region having a surface having no printed structure, the second region occupying an area of the inner surface greater than Or equal to 45% and less than 100%, the average roughness of the second region is greater than 0.33 μm and less than or equal to 0.6 μm.
本發明之另一種微結構導光板，與上述微結構導光板不同的地方在於：該第二區域佔該內面的面積為大於或等於90%且小於100%，該第二區域的平均粗糙度大於或等於0.2μm且小於0.33μm。Another microstructure light guide plate of the present invention is different from the above-mentioned microstructure light guide plate in that the area of the second area occupies the inner surface is greater than or equal to 90% and less than 100%, and the average roughness of the second area Greater than or equal to 0.2 μm and less than 0.33 μm.
本發明之再一種微結構導光板，包含：一出光面、一表面粗糙的內面，以及一連接於該出光面與該內面的一側的入光面。A further microstructure light guide plate of the present invention comprises: a light exit surface, a rough surface inner surface, and a light incident surface connected to the light exit surface and the inner surface.
該出光面具有數個微結構，每一個微結構的高度H為60~150μm，微結構的節距為P，且H/P為0.25~0.5。該內面位於該出光面的相反側，該內面包括一個表面具有一印刷結構的第一區域，以及一個表面不具有印刷結構的第二區域；該第二區域之平均粗糙度大於0.33μm且小於或等於0.6μm時，該印刷結構為一個由透明油墨所製成的印刷結構，該印刷結構的面積佔該內面的面積為大於0%且小於或等於55%；該第二區域之平均粗糙度為大於或等於0.2μm且小於0.33μm時，該印刷結構為一個含有樹脂微粒子的油墨所製成的印刷結構，該印刷結構的面積佔該內面的面積為大於0%且小於或等於10%。The light-emitting surface has a plurality of microstructures, each of which has a height H of 60 to 150 μm, a microstructure of a pitch of P, and an H/P of 0.25 to 0.5. The inner surface is located on the opposite side of the light-emitting surface, the inner surface includes a first region having a printed structure on the surface, and a second region having a surface having no printed structure; the average roughness of the second region is greater than 0.33 μm and When the film is less than or equal to 0.6 μm, the printed structure is a printed structure made of a transparent ink, the area of the printed structure occupies more than 0% and less than or equal to 55% of the area of the inner surface; When the roughness is greater than or equal to 0.2 μm and less than 0.33 μm, the printed structure is a printed structure made of an ink containing resin microparticles, the area of the printed structure occupies more than 0% and less than or equal to the area of the inner surface. 10%.
本發明之一種側光式背光模組，包含：一個如上述第三種的微結構導光板、一個位於該微結構導光板的入光面的一側的光源，以及一個位於該微結構導光板的內面的下方的反射板。An edge-lit backlight module of the present invention comprises: a third microstructure light guide plate as described above, a light source located on one side of the light incident surface of the microstructure light guide plate, and a light guide plate located on the microstructured light guide plate The inner surface of the reflector below.
本發明之微結構導光板可由一熱可塑性樹脂所形成，該熱可塑性樹脂選自：(甲基)丙烯酸酯系樹酯、聚苯乙烯樹脂、聚碳酸酯樹脂、甲基丙烯酸甲酯-苯乙烯共聚合物、丙烯腈-苯乙烯共聚合物，及聚對苯二甲酸乙二酯。上述所謂的(甲基)丙烯酸酯系樹脂，表示丙烯酸酯系樹脂及/或甲基丙烯酸酯系樹脂，是由(甲基)丙烯酸酯系單體所形成的聚合物，例如聚甲基丙烯酸甲酯(polymethyl methacerylate，簡稱PMMA)，上述(甲基)丙烯酸酯系單體，是表示丙烯酸酯系單體及/或甲基丙烯酸酯系單體，包括甲基丙烯酸甲酯、甲基丙烯酸乙酯、甲基丙烯酸異丙酯、正-丙烯酸丁酯，丙烯酸甲酯、丙烯酸乙酯、丙烯酸異丙酯等單體，其中以甲基丙烯酸甲酯單體及丙烯酸甲酯單體為佳。The microstructure light guide plate of the present invention may be formed of a thermoplastic resin selected from the group consisting of (meth)acrylate resin, polystyrene resin, polycarbonate resin, methyl methacrylate-styrene. Copolymer, acrylonitrile-styrene copolymer, and polyethylene terephthalate. The above-mentioned (meth) acrylate-based resin means an acrylate-based resin and/or a methacrylate-based resin, and is a polymer formed of a (meth) acrylate-based monomer, for example, polymethyl methacrylate. Polymethyl methacerylate (PMMA), the above (meth) acrylate monomer, means acrylate monomer and / or methacrylate monomer, including methyl methacrylate, ethyl methacrylate A monomer such as isopropyl methacrylate, n-butyl acrylate, methyl acrylate, ethyl acrylate or isopropyl acrylate, wherein methyl methacrylate monomer and methyl acrylate monomer are preferred.
上述微結構導光板之出光面的微結構為：三角柱狀透鏡(prism lens)、弧形柱狀透鏡(lenticular lens)、菲涅耳透鏡(Fresnel lens)，或梯形柱狀透鏡。微結構的材質可如同前述之熱可塑性樹脂所形成。The microstructure of the light-emitting surface of the microstructured light guide plate is: a prism lens, a lenticular lens, a Fresnel lens, or a trapezoidal cylindrical lens. The material of the microstructure can be formed like the aforementioned thermoplastic resin.
本發明之微結構導光板之出光面之微結構的製作，是以壓模(stamper)或滾輪(roller)等轉寫方式在該出光面上一體成型出微結構，上述壓模轉寫方式是在一基板及其表面上的表層，並以一成型壓模加溫加壓於表層上，使表層形成一微結構形狀；而滾輪轉寫方式係以一種樹脂押出形成單層體後或不同的兩種樹脂共押出形成積層體後，在一定的溫度下以轉寫滾輪將欲成型的形狀轉寫於該單層體或該積層體，使該單層體或該積層體表面成型成微結構形狀。The microstructure of the light-emitting surface of the microstructure light guide plate of the present invention is formed by integrally forming a microstructure on the light-emitting surface by means of a stamper or a roller, and the stamper transfer method is a surface layer on a substrate and its surface, and is heated and pressed on the surface layer by a molding die to form a microstructure shape; and the roller transfer mode is formed by pressing a resin to form a single layer body or different After the two resins are co-extruded to form a laminated body, the shape to be formed is transferred to the single layer body or the laminated body by a transfer roller at a certain temperature, so that the single layer body or the surface of the laminated body is formed into a microstructure. shape.
本發明之粗糙的內面的作用在於：光線從微結構導光板側端的入光面進入導光板，遇到該粗糙內面產生擴散，使超過全反射臨界角的光線受到該內面反射而從該出光面射出的光線變多，輝度變佳。上述該粗糙的內面的製作方式包括：The effect of the rough inner surface of the present invention is that light enters the light guide plate from the light incident surface of the side end of the microstructured light guide plate, and the rough inner surface is diffused, so that the light exceeding the critical angle of the total reflection is reflected by the inner surface. The light emitted from the light-emitting surface is increased, and the brightness is improved. The manner of making the rough inner surface described above includes:
(1)利用押板製程製作出表面有架橋樹脂微粒子的粗面層：將架橋樹脂微粒子及(甲基)丙烯酸酯系樹脂共押出後，經一滾輪轉寫成所需的粗面結構而形成一(甲基)丙烯酸酯系樹脂層(即為導光板的主要厚度所在)及一粗面層，該粗面層即具有該粗糙的內面，該粗面層的厚度為20~300μm；上述架橋樹脂微粒子具體例包括：架橋壓克力(Acrylic)系樹脂微粒子、架橋苯乙烯(MS)系樹脂微粒子、架橋壓克力系及苯乙烯系樹脂微粒子、架橋聚矽氧烷系微粒子等等有機微粒子及上述樹脂形成之中空架橋微粒子。上述架橋壓克力系樹脂微粒子之使用量佔(甲基)丙烯酸酯系樹脂100重量百分比(wt%)的0.05~10 wt%。上述壓克力系樹脂可由丙烯酸酯系單體及/或甲基丙烯酸酯系單體及其他反應性單體所聚合而成的架橋樹脂，其平均粒徑為2~30μm，具體例為：積水化成品工業製MBX-12，平均粒徑為12μm。(1) A rough surface layer having bridging resin fine particles on the surface is formed by a plate-making process: after the bridging resin fine particles and the (meth) acrylate-based resin are co-extruded, the desired rough surface structure is formed by a roller to form a a (meth) acrylate-based resin layer (that is, a main thickness of the light guide plate) and a rough surface layer having the rough inner surface, the rough surface layer having a thickness of 20 to 300 μm; Specific examples of the resin fine particles include organic fine particles such as Acrylic resin fine particles, bridging styrene (MS) resin fine particles, bridging acrylic and styrene resin fine particles, bridging polyoxyalkylene fine particles, and the like. And the hollow bridging microparticles formed by the above resin. The bridging acrylic resin fine particles are used in an amount of 0.05 to 10% by weight based on 100% by weight (% by weight) of the (meth)acrylate resin. The acryl resin may be a bridge resin obtained by polymerizing an acrylate monomer and/or a methacrylate monomer and other reactive monomers, and has an average particle diameter of 2 to 30 μm, and specific examples are: The finished product industry MBX-12 has an average particle size of 12 μm.
(2)利用押板製程直接在押出時做咬花處理：利用細砂材料噴灑於滾輪表面上形成粗面分布(Sandblasting法)，將(甲基)丙烯酸酯系樹脂押出後，經上述滾輪轉寫成所需的粗面結構，而形成一(甲基)丙烯酸酯系樹脂層及位於該樹脂層上的該粗糙的內面。(2) Using the slab process to directly bite the flower when it is extruded: a fine sand material is sprayed on the surface of the roller to form a rough surface distribution (Sandblasting method), and after the (meth) acrylate resin is extruded, the roller is rotated. The desired rough surface structure is written to form a (meth) acrylate-based resin layer and the rough inner surface on the resin layer.
(3)使用被雷射加工等方式而形成凹凸圖案之模具，在(甲基)丙烯酸酯系樹脂透明基板上加熱壓印，進而使該基板的其中一表面成為該粗糙的內面。(3) The mold having a concave-convex pattern formed by laser processing or the like is heated and imprinted on a (meth)acrylate-based resin transparent substrate, and one surface of the substrate is made into the rough inner surface.
(4)在(甲基)丙烯酸酯系樹脂透明基板上塗佈感光性樹脂，再以UV光照射硬化形成凹凸圖案之轉寫方法。(4) A transfer method in which a photosensitive resin is applied onto a (meth) acrylate-based resin transparent substrate and cured by UV light to form a concave-convex pattern.
由上述說明可知，由於製作該粗糙內面的方式有許多種，因此，該內面可以是直接形成於該基板上的表面，也可以為一個額外形成於基板上的粗面層的表面。As can be seen from the above description, since there are many ways of fabricating the rough inner surface, the inner surface may be a surface directly formed on the substrate, or may be a surface of a rough surface layer additionally formed on the substrate.
又，根據CNS-7868對於表面粗糙度的定義，可分為中心線平均粗糙度(Ra)、最大高度粗糙度(Rmax)、十點平均粗糙度(Rz)等表示方法，而本發明之平均粗糙度的測定是量測中心線平均粗糙度(Ra)，若從欲量測的粗糙面之粗糙曲線上，截取一段測量長度L，並以該長度內粗糙深之中心線為x軸，取中心線之垂直線為y軸，則粗糙曲線可用y=f(x)表之。以中心線為基準將x軸下方曲線鏡射到x軸上方，然後計算中心線上方包含經過鏡射後之全部曲線所涵蓋面積，再以測量長度除之，所得數值以μm為單位，即為待測面的中心線平均粗糙度值，其數學定義為：Further, according to the definition of surface roughness of CNS-7868, it can be classified into a center line average roughness (Ra), a maximum height roughness (Rmax), a ten point average roughness (Rz), and the like, and the average of the present invention. The roughness is measured by measuring the centerline average roughness (Ra). If the measured length L is taken from the rough curve of the rough surface to be measured, and the center line of the rough depth in the length is taken as the x-axis, The vertical line of the center line is the y-axis, and the roughness curve can be expressed by y=f(x). The curve below the x-axis is mirrored above the x-axis based on the center line, and then the area covered by the mirrored curve above the center line is calculated, and the measured length is divided by the measured length, and the obtained value is in μm. The average roughness value of the centerline of the surface to be measured is mathematically defined as:
Ra=(Σ|f(x)|dx)/L。Ra=(Σ|f(x)|dx)/L.
本發明之微結構導光板的內面上的印刷結構，較佳地為網點陣列結構，該網點陣列結構為高度小於5μm之弧形結構。該印刷結構可以是在樹脂平板上使用具有高反射率且不吸光的材料，在微結構導光板的內面用網版印刷印上圓形或方形的擴散點，印刷式網點陣列結構可例如：白色二氧化鈦(TiO2)粉末與透明的接著劑等溶液之混合物、預定的網點圖案(pattern)印刷形成。該印刷結構的材料不限於上述，因為其材料必須配合該內面的第二區域的平均粗糙度而選用，如前述，該印刷結構也可以是由透明油墨所製成。The printed structure on the inner surface of the microstructure light guide plate of the present invention is preferably a dot array structure, and the dot array structure is an arc structure having a height of less than 5 μm. The printing structure may be a material having high reflectivity and no light absorption on a resin plate, and a circular or square diffusion point is printed on the inner surface of the microstructure light guide plate by screen printing, and the printed dot array structure may be, for example: A white titanium dioxide (TiO 2 ) powder is formed by printing a mixture of a solution such as a transparent adhesive or a predetermined dot pattern. The material of the printing structure is not limited to the above, since the material must be selected in accordance with the average roughness of the second region of the inner surface. As described above, the printing structure may also be made of a transparent ink.
該印刷結構係直接在該內面上製作形成，其面積比例必須配合該內面的第二區域的平均粗糙度。當該第二區域的平均粗糙度控制在本發明所限定的適當大小時，印刷密度可降低，即較不需要印刷結構，因此該印刷結構的用量可以減少，並控制在本發明限定的範圍內，如此可降低印刷結構之均一性不易控制的缺點，並降低以往使用過多的印刷油墨的缺點，即，印刷油墨黏度不易控制等缺點，如此還可達到降低成本的目的。The printed structure is formed directly on the inner surface, and the area ratio must match the average roughness of the second region of the inner surface. When the average roughness of the second region is controlled to an appropriate size as defined by the present invention, the printing density can be reduced, that is, the printing structure is less required, so that the amount of the printing structure can be reduced and controlled within the limits defined by the present invention. In this way, the disadvantage that the uniformity of the printing structure is not easily controlled can be reduced, and the disadvantages of using too much printing ink in the past, that is, the disadvantage that the viscosity of the printing ink is not easily controlled, can be reduced, thereby achieving the purpose of reducing the cost.
本發明之微結構導光板的內面為粗糙面，可減少微結構導光板的表面的保護膜使用，進一步降低成本；另外，因為以往的導光板的內面為平面設計，容易被刮傷，將會在導光板的內面產生明顯的刮痕，而本發明的微結構導光板的內面為粗糙面，可使刮痕看起來較不明顯，亦即有遮瑕效果，可提高生產良率。The inner surface of the microstructure light guide plate of the present invention is a rough surface, which can reduce the use of the protective film on the surface of the microstructure light guide plate, further reducing the cost; and because the inner surface of the conventional light guide plate is flat, it is easy to be scratched. A significant scratch will be generated on the inner surface of the light guide plate, and the inner surface of the microstructure light guide plate of the present invention is a rough surface, so that the scratches appear less obvious, that is, there is a concealing effect, which can improve the production yield. .
本發明之微結構導光板的厚度是指出光面的微結構最高點到該內面的最低點之間的距離，本發明微結構導光板的厚度較佳地為0.1mm~5mm，最佳地為1.0mm~3mm。The thickness of the microstructure light guide plate of the present invention is the distance between the highest point of the microstructure of the light surface and the lowest point of the inner surface. The thickness of the microstructure light guide plate of the present invention is preferably 0.1 mm to 5 mm, optimally It is 1.0mm~3mm.
本發明的側光式背光模組的光源可使用冷陰極螢光燈(Cold Cathode Fluorescent Lamp,簡稱CCFL)或發光二極體(LED)等發光體，使用LED做為LCD背光源之發光體可降低耗電量，因環保節能意識抬頭，LED為未來LCD背光源之發光體主流，尤其用於下一波LCD TV上主力發展之背光源。發光二極體沿著該微結構導光板的入光面相間隔地排列，並使每一個發光二極體之發光方向朝向微結構之長度方向。The light source of the edge-lit backlight module of the present invention can use a luminescent body such as a Cold Cathode Fluorescent Lamp (CCFL) or a Light Emitting Diode (LED), and the LED can be used as an illuminant of the LCD backlight. Reducing power consumption, due to the awareness of environmental protection and energy conservation, LED is the mainstream of the future LCD backlight, especially for the backlight of the next wave of LCD TV development. The light emitting diodes are arranged at intervals along the light incident surface of the microstructured light guide plate, and the light emitting direction of each of the light emitting diodes is directed toward the length direction of the microstructure.
該反射板置於該微結構導光板的內面的下方，該反射板將光源由該內面發散的光線重新反射回導光板內，增加光線自導光板之出光面射出的機會，該反射板之反射面較佳地呈傾斜狀，而且較佳地為由兩側向中間並且向上凸起傾斜或者僅單獨向其中一側傾斜的設計，所述反射面之傾斜角度較佳小於30°，更佳小於20°，最佳小於10°。該反射板較佳是選自霧面式反射板或全像技術之反射板。霧面式反射板是在反射板的反射面上作霧化處理，而全像技術之反射板則可利用雷射或壓印式全像片圖案製成。The reflector is disposed below the inner surface of the microstructured light guide plate, and the reflector reflects the light diffused from the inner surface back into the light guide plate to increase the chance of light being emitted from the light exit surface of the light guide plate. The reflecting surface is preferably inclined, and is preferably designed to be inclined from both sides toward the center and upwardly convexly or only to one side thereof. The angle of inclination of the reflecting surface is preferably less than 30°. Preferably less than 20°, optimally less than 10°. The reflector is preferably a reflector selected from the group consisting of a matte reflector or a holographic technique. The matte reflector is atomized on the reflective surface of the reflector, while the holographic reflector is made from a laser or embossed full image.
本發明較佳地還可在該導光板之出光面上方設置一擴散膜。較佳地還可在擴散膜的上方設置一稜鏡片以進一步聚光。Preferably, the present invention further provides a diffusion film above the light exit surface of the light guide plate. It is also preferred to provide a batt sheet above the diffusion film for further concentrating.
本發明之功效：藉由該粗糙的內面的第二區域具有適當的平均粗糙度，配合適當面積分布的印刷結構，使該導光板具有良好的導光效果，並且能減少印刷油墨用量，以及減少保護膜的使用，達到降低成本的功效；微結構導光板的內面為粗糙面，可使刮痕看起來較不明顯，亦即有遮瑕的效果，可提高生產良率。The effect of the invention is that the second region of the rough inner surface has an appropriate average roughness, and the printed structure with appropriate area distribution enables the light guide plate to have a good light guiding effect and can reduce the amount of printing ink, and The use of the protective film is reduced, and the cost reduction effect is achieved; the inner surface of the microstructured light guide plate is a rough surface, which makes the scratches appear less obvious, that is, has a concealing effect, and can improve the production yield.
有關本發明之前述及其他技術內容、特點與功效，在以下配合參考圖式之二個較佳實施例與數個實驗例及一比較例的詳細說明中，將可清楚的呈現。在本發明被詳細描述前，要注意的是，在以下的說明內容中，類似的元件是以相同的編號來表示。The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the accompanying drawings. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.
參閱圖2、3，本發明側光式背光模組之第一較佳實施例，包含：一微結構導光板2、一光源3、一反射板4、一擴散膜5，以及一稜鏡片6。Referring to Figures 2 and 3, a first preferred embodiment of the edge-lit backlight module of the present invention comprises: a microstructured light guide plate 2, a light source 3, a reflector 4, a diffusion film 5, and a cymbal 6 .
該微結構導光板2包括：一個出光面21、一個位於該出光面21的相反側且表面粗糙的內面22、一連接於該出光面21與內面22的一側的入光面23，以及一個位於該內面22上的印刷結構24。其中，該出光面21具有數個長向延伸的柱狀微結構210，每一個微結構210的高度H為60~150μm，微結構210的節距為P(亦稱為pitch)，P即為每一微結構210的中央位置與相鄰的另一微結構210的中央位置的距離，也相當於每一微結構210的最高點與相鄰的另一微結構210的最高點的距離，且H/P為0.25~0.5。The microstructure light guide plate 2 includes: a light exit surface 21, an inner surface 22 on the opposite side of the light exit surface 21 and having a rough surface, and a light incident surface 23 connected to one side of the light exit surface 21 and the inner surface 22, And a printed structure 24 on the inner face 22. The light-emitting surface 21 has a plurality of long-length columnar microstructures 210. The height H of each of the microstructures 210 is 60-150 μm, and the pitch of the microstructure 210 is P (also called pitch), and P is The distance between the central position of each microstructure 210 and the central location of the adjacent other microstructure 210 also corresponds to the distance between the highest point of each microstructure 210 and the highest point of another adjacent microstructure 210, and H/P is 0.25~0.5.
該內面22包括一個第一區域221以及一個第二區域222，所述第一區域221是指表面具有該印刷結構24的區域，因此本實施例的第一區域221實際上是由數個間隔的區塊所構成，所述第二區域222是指表面不具有印刷結構24的區域。The inner face 22 includes a first region 221 and a second region 222, the first region 221 refers to a region having the printed structure 24 on the surface, so the first region 221 of the present embodiment is actually separated by a plurality of intervals. The block constituting the second region 222 refers to a region where the surface does not have the printed structure 24.
若該第二區域222的平均粗糙度(簡稱Ra)大於0.33μm且小於或等於0.6μm，則須配合該第二區域222佔該內面22的面積為大於或等於45%且小於100%。若該第二區域222的平均粗糙度大於或等於0.2μm且小於0.33μm，則須配合該第二區域222佔該內面22的面積為大於或等於90%且小於100%。實際上，該第二區域222的面積相當於不具有印刷結構24的部位的面積，此面積愈小，就代表印刷結構24的面積愈大。後續還會透過實驗說明該第二區域222的平均粗糙度以及面積比例的限制。If the average roughness (abbreviation Ra) of the second region 222 is greater than 0.33 μm and less than or equal to 0.6 μm, the area of the second region 222 occupying the inner surface 22 must be greater than or equal to 45% and less than 100%. If the average roughness of the second region 222 is greater than or equal to 0.2 μm and less than 0.33 μm, the area of the second region 222 occupying the inner surface 22 must be greater than or equal to 90% and less than 100%. In practice, the area of the second region 222 corresponds to the area of the portion that does not have the printed structure 24. The smaller the area, the larger the area of the printed structure 24. The average roughness of the second region 222 and the limitation of the area ratio will be described later through experiments.
本實施例的印刷結構24為網點陣列結構，該網點陣列結構為高度小於5μm之弧形結構，但實施時不限於此。網點陣列的高度h(標示如圖3)是指網點的最低點到該內面22的距離。製成該印刷結構24的材料沒有特定，當該第二區域222之平均粗糙度大於0.33μm且小於或等於0.6μm時，較佳地，該印刷結構24為一個由透明油墨所製成的印刷結構24，該印刷結構24的面積佔該內面22的面積為大於0%且小於或等於55%。當該第二區域222之平均粗糙度為大於或等於0.2μm且小於0.33μm時，較佳地，該印刷結構24為一個含有樹脂微粒子的油墨所製成的印刷結構24，該印刷結構24的面積佔該內面22的面積為大於0%且小於或等於10%。其中，所述樹脂微粒子例如白色的二氧化鈦粉末。The printing structure 24 of this embodiment is a dot array structure, which is an arc structure having a height of less than 5 μm, but is not limited thereto. The height h of the dot array (indicated as in Figure 3) refers to the distance from the lowest point of the dot to the inner face 22. The material from which the printing structure 24 is formed is not specific. When the average roughness of the second region 222 is greater than 0.33 μm and less than or equal to 0.6 μm, preferably, the printing structure 24 is a printing made of transparent ink. Structure 24, the area of the printed structure 24 occupies more than 0% and less than or equal to 55% of the area of the inner surface 22. When the average roughness of the second region 222 is greater than or equal to 0.2 μm and less than 0.33 μm, preferably, the printed structure 24 is a printed structure 24 made of an ink containing resin microparticles, the printed structure 24 The area of the inner face 22 is greater than 0% and less than or equal to 10%. Among them, the resin fine particles are, for example, white titanium dioxide powder.
上述限定的主要精神在於：當第二區域222的粗糙度較大時，要配合較大面積的印刷結構24，此乃因為粗糙度大時，會使光線往四面八方反射，反射光線之間容易互相抵消，從而減弱光擴散效果，因此須配合較大面積的印刷結構24來輔助達到光反射與光擴散作用，因為此時配合使用透明油墨製成的印刷結構24，能提高自該反射板4往上反射而穿過該印刷結構24的光線量，達到補光效果，從而提高亮度。反之，第二區域222的粗糙度較小時，則配合較小面積的印刷結構24即可，由於此時可被導出的光線的強度足夠，因此可以配合使用一般的樹脂微粒子油墨所製成的印刷結構24。The main spirit of the above definition is that when the roughness of the second region 222 is large, the printing structure 24 of a larger area is to be matched, because the roughness is large, the light is reflected in all directions, and the reflected light is easy to mutually Offset, thereby reducing the light diffusion effect, so it is necessary to cooperate with the printing area 24 of a larger area to assist the light reflection and light diffusion, because the printing structure 24 made of the transparent ink can be improved from the reflection plate 4 The amount of light that is reflected upwardly through the printed structure 24 achieves a fill light effect, thereby increasing brightness. On the other hand, when the roughness of the second region 222 is small, the printed structure 24 of a small area can be matched. Since the intensity of the light that can be derived at this time is sufficient, it can be used in combination with a general resin fine particle ink. Print structure 24.
該光源3位於該微結構導光板2的入光面23的一側，並且包括數個沿著該入光面23相間隔地排列的發光二極體31，每一個發光二極體31之發光方向朝向該入光面23，亦朝向所述微結構210之長度方向。實施時，該光源3也可以同時設置於該微結構導光板2的左右兩側，此時該微結構導光板2的左右兩側都是可供光線進入的入光面。The light source 3 is located on one side of the light incident surface 23 of the microstructured light guide plate 2, and includes a plurality of light emitting diodes 31 arranged at intervals along the light incident surface 23, and each of the light emitting diodes 31 emits light. The direction is toward the light incident surface 23 and also toward the length of the microstructure 210. In the implementation, the light source 3 can also be disposed on the left and right sides of the microstructured light guide plate 2 at the same time. At this time, the left and right sides of the microstructured light guide plate 2 are light incident surfaces for allowing light to enter.
該反射板4位於該微結構導光板2的內面22下方，用於將通過該入光面23而來的光線朝該出光面21反射。The reflector 4 is located below the inner surface 22 of the microstructured light guide plate 2 for reflecting light passing through the light incident surface 23 toward the light exit surface 21.
該擴散膜5位於該微結構導光板2的出光面21的上方，具有將光線擴散霧化的功能，使模組整體的亮度均勻。The diffusion film 5 is located above the light-emitting surface 21 of the microstructured light guide plate 2, and has a function of diffusing and diffusing light, so that the brightness of the entire module is uniform.
該稜鏡片6位於該擴散膜5的上方，並具有用於集光的稜柱結構，可達到聚光效果而提升模組輝度。The cymbal sheet 6 is located above the diffusion film 5 and has a prismatic structure for collecting light, which can achieve a concentrating effect and enhance the brightness of the module.
本發明之內面22為粗糙表面，相對於以往平面設計的內面而言，粗糙內面22有助於將光線朝該出光面21反射，再配合該內面22上之適當面積的印刷結構24也用於反射與擴散光線，從而使本發明的導光板具有良好的反射與導光效果，有效地將光線往該出光面21導出。此外，該粗糙的內面22設計可以幫助減少印刷結構24的設置面積，亦即能減少印刷油墨的用量，從而降低製造成本。另外，該粗糙的內面22具有霧化光線、霧化遮瑕的功能，因此即使該內面22上有輕微刮痕，也不易被觀察到，換言之，本發明之模組不須額外貼設保護膜來保護該內面22，如此可以減少保護膜的使用，降低成本。也因為該粗糙內面22的霧化光線功能，本發明的背光模組不以該擴散膜5為必要元件。The inner surface 22 of the present invention is a rough surface. The rough inner surface 22 helps to reflect light toward the light exit surface 21 relative to the inner surface of the conventional planar design, and then cooperates with the appropriate area of the printed structure on the inner surface 22. 24 is also used for reflecting and diffusing light, so that the light guide plate of the present invention has good reflection and light guiding effects, and effectively directs light to the light exit surface 21. In addition, the rough inner face 22 design can help reduce the installation area of the printed structure 24, that is, reduce the amount of printing ink, thereby reducing manufacturing costs. In addition, the rough inner surface 22 has the function of atomizing light and atomizing concealing, so even if there is a slight scratch on the inner surface 22, it is not easy to be observed. In other words, the module of the present invention does not require additional protection. The film protects the inner face 22, which can reduce the use of the protective film and reduce the cost. Also because of the atomizing light function of the rough inner surface 22, the backlight module of the present invention does not use the diffusion film 5 as an essential component.
參閱表1，為本發明的四個實驗例與一個比較例的實驗結果，表中的「霧化遮瑕效果」是直接觀察導光板表面的瑕疵狀況而得。由表1結果可知，實驗例1~4的H、H/P、Ra以及印刷結構的面積比例，皆落在本發明限定的數值範圍內，肉眼觀察實驗例1~4的表面，皆未看到刮痕，表示實驗例1~4的霧化遮瑕效果良好，因此可以省略使用保護膜。反觀比較例1，雖然其H、H/P以及印刷結構面積比例落在本發明限定的數值範圍內，但由於比較例1的內面為平面設計(Ra=0)，無法將光線霧化，導致其不具有遮瑕效果，以肉眼觀察會直接看到比較例1的導光板上的刮痕，因此比較例1必須額外以保護膜保護，整體成本較高。Referring to Table 1, the experimental results of the four experimental examples and one comparative example of the present invention, the "atomizing concealing effect" in the table is obtained by directly observing the flaw condition of the surface of the light guiding plate. As can be seen from the results of Table 1, the area ratios of H, H/P, Ra and the printed structure of Experimental Examples 1 to 4 fall within the numerical range defined by the present invention, and the surfaces of Experimental Examples 1 to 4 were visually observed. The scratches showed that the atomization concealing effects of Experimental Examples 1 to 4 were good, so that the use of the protective film could be omitted. In contrast, in Comparative Example 1, although the H, H/P, and printed structure area ratios fall within the numerical range defined by the present invention, since the inner surface of Comparative Example 1 is a planar design (Ra = 0), the light cannot be atomized. As a result, it does not have a concealing effect, and the scratch on the light guide plate of Comparative Example 1 is directly observed by the naked eye, so Comparative Example 1 must be additionally protected by a protective film, and the overall cost is high.
更進一步說明，實驗例2的Ra=0.33μm，其粗糙度適中，此時可以不設置任何印刷結構就具有良好的霧化遮瑕效果。以Ra=0.33μm為分界，當Ra變小或變大時，都需要配合適當面積的印刷結構。以實驗例1為例，Ra=0.2μm，印刷結構的面積比例為10%，而實施例3、4的Ra分別為0.5μm及0.6μm，需要配合較大面積的印刷結構，分別為40%及55%的比例。Further, in Experimental Example 2, Ra = 0.33 μm, and the roughness was moderate, and at this time, a good fogging concealing effect was obtained without providing any printing structure. With Ra=0.33 μm as the boundary, when Ra becomes smaller or larger, it is necessary to match the printing structure of an appropriate area. Taking Experimental Example 1 as an example, Ra = 0.2 μm, the area ratio of the printed structure is 10%, and the Ra of Examples 3 and 4 are 0.5 μm and 0.6 μm, respectively, and it is necessary to match a large-area printing structure, respectively 40%. And a ratio of 55%.
綜上所述，藉由該內面22的第二區域222具有適當的平均粗糙度，配合適當面積分布的印刷結構24，使本發明具有良好的反射與導光效果，並且能減少印刷油墨用量，以及減少保護膜的使用，達到降低成本的目的。In summary, the second region 222 of the inner surface 22 has an appropriate average roughness, and the printed structure 24 with an appropriate area distribution enables the invention to have good reflection and light guiding effects, and can reduce the amount of printing ink. And reduce the use of protective film to achieve the purpose of reducing costs.
參閱圖4，本發明側光式背光模組之第二較佳實施例，與該第一較佳實施例的結構大致相同，不同的地方在於：本實施例的微結構導光板2的微結構210為截面呈梯形的梯形柱狀透鏡。由於本實施例所達到的功效與該第一較佳實施例相同，因此不再詳述。Referring to FIG. 4, the second preferred embodiment of the edge-lit backlight module of the present invention is substantially the same as the structure of the first preferred embodiment, and the difference lies in the microstructure of the microstructured light guide plate 2 of the present embodiment. 210 is a trapezoidal cylindrical lens having a trapezoidal cross section. Since the effects achieved by the present embodiment are the same as those of the first preferred embodiment, they will not be described in detail.
惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專利範圍及發明說明內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.
2．．．微結構導光板2. . . Microstructure light guide
21．．．出光面twenty one. . . Glossy surface
210．．．微結構210. . . microstructure
22．．．內面twenty two. . . inside
221．．．第一區域221. . . First area
222．．．第二區域222. . . Second area
23．．．入光面twenty three. . . Glossy surface
24．．．印刷結構twenty four. . . Printed structure
3．．．光源3. . . light source
31．．．發光二極體31. . . Light-emitting diode
4．．．反射板4. . . Reflective plate
5．．．擴散膜5. . . Diffusion film
6．．．稜鏡片6. . . Bract
H．．．微結構的高度H. . . Microstructure height
P．．．微結構的節距P. . . Microstructure pitch
圖1是一種已知導光板的側視示意圖；Figure 1 is a side elevational view of a known light guide plate;
圖2是一立體分解圖，顯示本發明側光式背光模組之一第一較佳實施例；2 is an exploded perspective view showing a first preferred embodiment of the edge-lit backlight module of the present invention;
圖3是該第一較佳實施例之一微結構導光板的局部側視示意圖；及3 is a partial side elevational view of the microstructure light guide plate of the first preferred embodiment; and
圖4是一側視示意圖，顯示本發明側光式背光模組之一第二較佳實施例的一微結構導光板。4 is a side elevational view showing a microstructured light guide plate of a second preferred embodiment of the edge-lit backlight module of the present invention.
2．．．微結構導光板2. . . Microstructure light guide
21．．．出光面twenty one. . . Glossy surface
210．．．微結構210. . . microstructure
22．．．內面twenty two. . . inside
23．．．入光面twenty three. . . Glossy surface
24．．．印刷結構twenty four. . . Printed structure
3．．．光源3. . . light source
31．．．發光二極體31. . . Light-emitting diode
4．．．反射板4. . . Reflective plate
5．．．擴散膜5. . . Diffusion film
6．．．稜鏡片6. . . Bract
Claims (11)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100149551A TWI452362B (en) | 2011-12-29 | 2011-12-29 | Microstructure light guide plate and edge type backlight module |
| CN201210037251.8A CN103185912B (en) | 2011-12-29 | 2012-02-17 | Microstructure light guide plate and side light type backlight module |
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| Application Number | Priority Date | Filing Date | Title |
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| TW100149551A TWI452362B (en) | 2011-12-29 | 2011-12-29 | Microstructure light guide plate and edge type backlight module |
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| TW201326925A true TW201326925A (en) | 2013-07-01 |
| TWI452362B TWI452362B (en) | 2014-09-11 |
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Cited By (2)
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| US9442240B2 (en) | 2012-03-16 | 2016-09-13 | Radiant Opto-Electronics Corporation | Light guide plate and light source module |
| TWI566929B (en) * | 2016-01-12 | 2017-01-21 | Optivision Tech Inc | Integrated optical film and its diffuser |
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| CN104930396A (en) * | 2014-03-17 | 2015-09-23 | 云光科技股份有限公司 | Side-light type luminous module structure |
| CN105892085A (en) * | 2015-01-26 | 2016-08-24 | 宁波高新区易能电子科技有限公司 | Color-changing spectacle frame based on liquid crystal display technology |
| CN105372749A (en) * | 2015-11-13 | 2016-03-02 | 重庆鑫翎创福光电科技股份有限公司 | PMMA light guide plate with prism structure |
| CN107728249B (en) * | 2016-08-12 | 2021-03-30 | 群创光电股份有限公司 | Display device |
| CN110709758B (en) * | 2017-05-11 | 2022-02-08 | 镭亚股份有限公司 | Microstructured multibeam element backlight |
| CN108022997A (en) * | 2017-12-08 | 2018-05-11 | 中天科技精密材料有限公司 | A kind of light total reflection film of photovoltaic module |
| JP2019139851A (en) * | 2018-02-06 | 2019-08-22 | オムロン株式会社 | Light guide plate, surface light source device, display device, and electronic apparatus |
| CN109375310A (en) * | 2018-12-07 | 2019-02-22 | 上海向隆电子科技有限公司 | Light guide plate, light guide module and exhibition light micro-structure processing unit (plant) |
| CN116343584A (en) | 2021-12-22 | 2023-06-27 | 瑞轩科技股份有限公司 | Backlight module of display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6334689B1 (en) * | 1997-01-30 | 2002-01-01 | Hitachi, Ltd. | Liquid crystal display |
| JP3257457B2 (en) * | 1997-07-31 | 2002-02-18 | 株式会社日立製作所 | Liquid crystal display |
| KR100912361B1 (en) * | 2004-08-06 | 2009-08-19 | 가부시키가이샤 구라레 | Light guide plate, production method therefor, and surface light source device provided with it |
| TWI420169B (en) * | 2009-12-18 | 2013-12-21 | Hon Hai Prec Ind Co Ltd | Light guide plate and backlight module |
| TWI436112B (en) * | 2009-12-31 | 2014-05-01 | Chi Lin Optoelectronics Co Ltd | Light guide plate, back light module, and lcd apparatus |
| CN102128415A (en) * | 2010-01-19 | 2011-07-20 | 奇菱科技股份有限公司 | Light guide plate, backlight module and liquid crystal display device |
| TWI454760B (en) * | 2010-02-06 | 2014-10-01 | Hon Hai Prec Ind Co Ltd | Back light module and light guide plate thereof |
| TWI429971B (en) * | 2010-04-27 | 2014-03-11 | Univ Nat Kaohsiung 1St Univ Sc | Integral light guide plate with axial light collection effect |
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2011
- 2011-12-29 TW TW100149551A patent/TWI452362B/en not_active IP Right Cessation
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2012
- 2012-02-17 CN CN201210037251.8A patent/CN103185912B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9442240B2 (en) | 2012-03-16 | 2016-09-13 | Radiant Opto-Electronics Corporation | Light guide plate and light source module |
| TWI566929B (en) * | 2016-01-12 | 2017-01-21 | Optivision Tech Inc | Integrated optical film and its diffuser |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103185912B (en) | 2014-12-24 |
| TWI452362B (en) | 2014-09-11 |
| CN103185912A (en) | 2013-07-03 |
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