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TWI393921B - Optical element, manufacturing method thereof, and a backlight module - Google Patents

Optical element, manufacturing method thereof, and a backlight module Download PDF

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Publication number
TWI393921B
TWI393921B TW98101955A TW98101955A TWI393921B TW I393921 B TWI393921 B TW I393921B TW 98101955 A TW98101955 A TW 98101955A TW 98101955 A TW98101955 A TW 98101955A TW I393921 B TWI393921 B TW I393921B
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Taiwan
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light
curve
optical
backlight module
microstructure
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TW98101955A
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TW201028740A (en
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Yan Zuo Chen
Wen Feng Cheng
Chun Wei Wang
Chih Wei Huang
Cheng Lin
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Entire Technology Co Ltd
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Description

光學元件與其製造方法及背光模組 Optical component, manufacturing method thereof and backlight module

本發明是關於一種光學元件,特別是一種關於具有微型結構與反射結構的光學元件。 This invention relates to an optical component, and more particularly to an optical component having a microstructure and a reflective structure.

圖1所繪示為US7309149中之增亮膜之部份剖視圖。參照圖1,增亮膜1’之入光面12’上包含一反射結構13’,當第一光線L1、第二光線L2及第三光線L3入射於增亮膜1’之入光面12’後,第一光線L1朝增亮膜1’之正面折射,第二光線L2自反射結構13’反射,而第三光線L3則被反射結構13’或棱鏡單元11’反射。受到反射之第二光線L2及第三光線L3會再度被增亮膜1’下方之反射板(未顯示)反射,以便重新利用第二光線L2及第三光線L3。 Figure 1 is a partial cross-sectional view of the brightness enhancing film of U.S. Patent No. 7,309,149. Referring to FIG. 1, the light incident surface 12' of the brightness enhancing film 1' includes a reflective structure 13', and the first light L1, the second light L2, and the third light L3 are incident on the light incident surface of the brightness enhancing film 1'. After that, the first light L1 is refracted toward the front surface of the brightness enhancing film 1', the second light L2 is reflected from the reflective structure 13', and the third light L3 is reflected by the reflective structure 13' or the prism unit 11'. The reflected second light L2 and the third light L3 are again reflected by a reflecting plate (not shown) under the brightness enhancing film 1' to reuse the second light L2 and the third light L3.

由於反射結構13’的設置,可使入射至入光面的光線較不易朝增亮膜之旁側折射,故當使用者由增亮膜1’之正面觀看時,其會感受到較高的亮度。 Due to the arrangement of the reflective structure 13', the light incident on the light incident surface is less likely to be refracted toward the side of the brightness enhancing film, so that when the user is viewed from the front side of the brightness enhancing film 1', it will feel higher. brightness.

在US7309149中,其規範反射結構13’之寬度小於或等於棱鏡單元11’間之間距的三分之二。然而,其並未對反射結構13’之間隔與厚度作規範,故本領域具有通常知識者無法根據US7309149作出進一步優化的設計。而且,上述之棱鏡單元11’皆以彼此平行的方式排列在增亮膜1,1’上,由於液晶面板上的像素電極也是以彼此平行的方式進行排列,故在視覺上易於產生所謂的疊紋圖形(moire pattern)。 In U.S. Patent 7,309,149, the width of the canonical reflective structure 13' is less than or equal to two-thirds of the distance between the prism elements 11'. However, it does not specify the spacing and thickness of the reflective structures 13', so there is a design in the art that cannot be further optimized according to US 7,309,149. Moreover, the prism units 11' described above are arranged in parallel with each other on the brightness enhancement film 1, 1'. Since the pixel electrodes on the liquid crystal panel are also arranged in parallel with each other, it is visually easy to produce a so-called stack. Moire pattern.

因此,如何解決上述之問題,是值得本領域具有通常知識者去思量地。 Therefore, how to solve the above problems is worthy of consideration by those who have common knowledge in the field.

本發明之目的是提供一種光學元件,此光學元件可有效消除疊紋圖形之問題,同時也對反射結構之間隔與厚度作規範,以使本領域具有通常知識者可作出優化的設計。 SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical component that effectively eliminates the problem of moiré patterns while also sizing the spacing and thickness of the reflective structures so that those skilled in the art can make optimized designs.

根據上述目的與其他目的,本發明提供一種光學元件,其具有一出光面與一入光面,且放置於入光面側之至少一光源所發出的光線會於光學元件內部產生至少一光學路徑。光學元件包括多個微型結構與多個反射結構,其中微型結構是沿著一第一方向延伸且沿著一第二方向排列於出光面上。每一微型結構具有一頂邊,此頂邊位於出光面上並形成彼此相鄰的多條第一曲線與多條第二曲線。第一曲線與第二曲線往第一方向延伸,該第一曲線與該第二曲線於該第二方向上之間距離不相等且不平行,且該第二曲線與另一第一曲線之該第二方向上之間距離不相等且不平行。 According to the above and other objects, the present invention provides an optical component having a light exiting surface and a light incident surface, and the light emitted by the at least one light source placed on the light incident surface side generates at least one optical path inside the optical component. . The optical component includes a plurality of microstructures and a plurality of reflective structures, wherein the microstructures extend along a first direction and are arranged along a second direction on the light exiting surface. Each of the microstructures has a top edge on the light exit surface and forms a plurality of first curves and a plurality of second curves adjacent to each other. The first curve and the second curve extend in a first direction, the distance between the first curve and the second curve in the second direction is unequal and non-parallel, and the second curve and the other first curve The distance between the second directions is not equal and not parallel.

另外,每一反射結構沿著第一方向延伸且依照第二方向排列於入光面上,且每一反射結構的位置與兩個微型結構的交接處相互對應。反射結構的厚度t,微型結構之底部的寬度P,與光學元件的折射率n,滿足以下的公式: In addition, each of the reflective structures extends along the first direction and is arranged on the light incident surface according to the second direction, and the position of each of the reflective structures corresponds to the intersection of the two microstructures. The thickness t of the reflective structure, the width P of the bottom of the microstructure, and the refractive index n of the optical element satisfy the following formula:

其中,光學路徑是由光學元件的入光面入射,藉 由反射結構之厚度以控制光學路徑,且出光面上之該些微型結構是用以將光學路徑進行收斂。 Wherein, the optical path is incident on the light incident surface of the optical element, The optical path is controlled by the thickness of the reflective structure, and the microstructures on the light exiting surface are used to converge the optical path.

於上述之光學元件中,微型結構之縱向剖面的輪廓為一弧線,該弧線的曲率半徑為R,第一曲線與該第二曲線於該第二方向上之距離為D,R與D滿足以下的公式:0.5R<D<3R。 In the above optical component, the profile of the longitudinal section of the microstructure is an arc having a radius of curvature R, and the distance between the first curve and the second curve in the second direction is D, and R and D satisfy the following Formula: 0.5R<D<3R.

於上述之光學元件中,微型結構的焦距FD與微型結構之底部的寬度P,滿足以下的公式: In the above optical element, the focal length FD of the microstructure and the width P of the bottom of the microstructure satisfy the following formula:

根據上述目的與其他目的,本發明提供一種光學元件的製造方法,用於製造上述之光學元件,此光學元件的製造方法包括下述之步驟。首先,提供一透明基材,並於該透明基材的其中一側塗佈上一成型膠。再來,提供一模具,該模具的表面上具有多個成型圖案,這些成型圖案的外型與光學元件上的微型結構相對應。之後,模具於成型膠上進行壓印,並對壓印後的成型膠進行硬化,以形成微型結構。再來,於透明基材的另外一側塗佈一光阻層。接著,對光阻層進行曝光顯影製程,以形成一結構區域,並將非結構區域之光阻層去除。之後,塗佈上一反射材料層。再來,將結構區域之光阻層與位於其上之反射材料層去除,並形成反射結構。 In accordance with the above and other objects, the present invention provides a method of fabricating an optical component for fabricating the optical component described above, the method of fabricating the optical component comprising the steps described below. First, a transparent substrate is provided, and a molding gel is coated on one side of the transparent substrate. Further, a mold is provided having a plurality of molding patterns on the surface thereof, the shapes of the molding patterns corresponding to the microstructures on the optical elements. Thereafter, the mold is embossed on the molding gel, and the embossed molding compound is hardened to form a microstructure. Further, a photoresist layer is coated on the other side of the transparent substrate. Next, the photoresist layer is subjected to an exposure and development process to form a structural region, and the photoresist layer of the non-structural region is removed. Thereafter, a layer of reflective material is applied. Then, the photoresist layer of the structural region and the reflective material layer located thereon are removed, and a reflective structure is formed.

根據上述目的與其他目的,本發明提供一種背光模組,此背光模組包括一光學薄板、至少一光源以及上述之光學元件,光學元件放置於光學薄板的出光面側。 According to the above and other objects, the present invention provides a backlight module. The backlight module includes an optical thin plate, at least one light source, and the optical component. The optical component is placed on the light emitting surface side of the optical thin plate.

於上述之背光模組中,光學薄板為一擴散板或一導光板。 In the above backlight module, the optical sheet is a diffusion plate or a light guide plate.

於上述之背光模組中,光源為冷陰極螢光燈管或發光二極體。 In the above backlight module, the light source is a cold cathode fluorescent tube or a light emitting diode.

為讓本發明之上述目的、特徵和優點更能明顯易懂,下文將以實施例並配合所附圖示,作詳細說明如下。 The above described objects, features, and advantages of the present invention will become more apparent from the following description.

於下述之實施例中,將以x軸方向代表第二方向,y軸方向代表第一方向,但本領域具有通常知識者應該可了解這只是為了表示的方便,而非對第一方向與第二方向所做的限定。 In the following embodiments, the second direction will be represented by the x-axis direction, and the y-axis direction represents the first direction, but those skilled in the art should understand that this is merely for convenience of representation, not for the first direction. The limit made in the second direction.

請參照圖2,圖2所繪示為本發明之第一實施例的光學元件的立體圖。光學元件2大體上呈一薄板狀,其例如是配置在直下式背光模組中之擴散板的上方,亦即擴散板的出光面側。其中,光學元件2的出光面21具有多個微型結構22,這些微型結構22是沿著X方向排列於出光面21上,且每一微型結構22具有一頂邊221。其中,這些微型結構22的功用是為了將光線的光學路徑進行收斂。 Referring to FIG. 2, FIG. 2 is a perspective view of an optical component according to a first embodiment of the present invention. The optical element 2 is substantially in the form of a thin plate, which is disposed, for example, above the diffusing plate in the direct type backlight module, that is, on the light emitting surface side of the diffusing plate. The light-emitting surface 21 of the optical element 2 has a plurality of microstructures 22 arranged on the light-emitting surface 21 along the X direction, and each of the microstructures 22 has a top edge 221 . Among them, the function of these microstructures 22 is to converge the optical path of the light.

另外,於光學元件2的入光面24上還設置有多個反射結構23,這些反射結構23是沿著X方向排列於入光面24上,反射結構23的材質為二氧化鈦或氧化鎂。而且,每一反射結構23的位置與兩個微型結構22間所形成的波谷222相互對應。其中,反射結構23的厚度為t,微型結構22之底部的寬度為P, 且光學元件2的折射率為n,且滿足以下的公式: Further, a plurality of reflective structures 23 are disposed on the light incident surface 24 of the optical element 2. The reflective structures 23 are arranged on the light incident surface 24 along the X direction. The reflective structure 23 is made of titanium dioxide or magnesium oxide. Moreover, the position of each of the reflective structures 23 and the valleys 222 formed between the two microstructures 22 correspond to each other. Wherein, the thickness of the reflective structure 23 is t, the width of the bottom of the microstructure 22 is P, and the refractive index of the optical element 2 is n, and the following formula is satisfied:

由圖2可知,部分光線L4是由入光面24入射,而部分的光線L5則被反射結構23反射,藉由反射結構23之厚度t可以控制光線的光學路徑。而且,於出光面21上之微型結構22可將光線L4的光學路徑進行收斂。 As can be seen from FIG. 2, part of the light ray L4 is incident on the light incident surface 24, and part of the light ray L5 is reflected by the reflective structure 23, and the optical path of the light ray can be controlled by the thickness t of the reflective structure 23. Moreover, the microstructures 22 on the light exit surface 21 converge the optical path of the light ray L4.

請參照圖2與圖3,圖3所繪示為頂邊於xy平面上的投影所形成的多條曲線。由圖2可知,微型結構22基本上是往y方向延伸,且微型結構22的延伸路徑是呈曲線。當微型結構22的頂邊221投影在xy平面上時至少會形成多種不同的曲線,在此將從左邊數來位於奇數位置的曲線稱為第一曲線2211,而將從右邊數來位於偶數位置的曲線稱為第二曲線2212。需注意的是,將曲線分成第一曲線2211與第二曲線2212只是說明的方便,並不代表所有的第一曲線2211都具有相同的曲線形狀,也不代表所有的第二曲線2212都具有相同的曲線形狀。 Referring to FIG. 2 and FIG. 3, FIG. 3 illustrates a plurality of curves formed by projection of the top edge on the xy plane. As can be seen from Figure 2, the microstructure 22 extends substantially in the y-direction and the extension of the microstructure 22 is curved. When the top edge 221 of the microstructure 22 is projected on the xy plane, at least a plurality of different curves are formed. Here, the curve from the left side at the odd position is referred to as the first curve 2211, and the number from the right side is located at the even position. The curve is referred to as a second curve 2212. It should be noted that dividing the curve into the first curve 2211 and the second curve 2212 is merely a convenience of explanation, and does not mean that all the first curves 2211 have the same curved shape, nor does it mean that all the second curves 2212 have the same Curve shape.

請參照圖3,第一曲線2211與第二曲線2212,第一曲線2211與第二曲線2212間並不平行。其中,每一第二曲線2212位於其中二第一曲線2211之間,且位於其中一側的第一曲線2211與第二曲線2212間的距離為D1,而位於另外一側的第一曲線2211與第二曲線2212間的距離為D2。其中,距離D1與 距離D2會沿著y方向而產生變化,且距離D1與距離D2並不相同。 Referring to FIG. 3, the first curve 2211 and the second curve 2212 are not parallel between the first curve 2211 and the second curve 2212. Wherein, each second curve 2212 is located between the two first curves 2211, and the distance between the first curve 2211 and the second curve 2212 on one side is D1, and the first curve 2211 on the other side is The distance between the second curves 2212 is D2. Among them, the distance D1 and The distance D2 changes along the y direction, and the distance D1 is not the same as the distance D2.

微型結構22的縱向剖面的輪廓為一弧線,且此弧線的曲率半徑為R。不管是距離D1及距離D2,在此統稱為距離D,與曲率半徑R的關係可表述成以下的公式:0.5R<D<3R............................公式(2)。 The profile of the longitudinal section of the microstructure 22 is an arc and the radius of curvature of the arc is R. Regardless of the distance D1 and the distance D2, collectively referred to herein as the distance D, the relationship with the radius of curvature R can be expressed as the following formula: 0.5R<D<3R................ ............Formula (2).

另外,微型結構的焦距為FD(未繪示於圖中),且滿足以下的公式: In addition, the focal length of the microstructure is FD (not shown in the figure), and the following formula is satisfied:

由於液晶面板上的像素電極也是以彼此平行的方式進行排列,而本實施例的微型結構22的延伸路徑是呈曲線,故其在視覺上較不易產生疊紋圖形。 Since the pixel electrodes on the liquid crystal panel are also arranged in parallel with each other, and the extension path of the microstructure 22 of the present embodiment is curved, it is visually less likely to generate a moiré pattern.

此外,本案之申請人將上述之光學元件2進行電腦模擬,在此模擬中,微型結構22之底部的寬度P設為185μm,光學元件2的折射率n為1.63,藉由改變反射結構23的厚度為t,可得到下表: In addition, the applicant of the present invention performs computer simulation of the above-mentioned optical component 2, in which the width P of the bottom of the microstructure 22 is set to 185 μm, and the refractive index n of the optical element 2 is 1.63, by changing the reflection structure 23 The thickness is t, the following table can be obtained:

其中,上表的“強度”代表從光學元件2的正面觀看時所呈現的光強度,而“1/2視角”則代表光強度減為正面觀看之光強度的1/2時之觀看角度。而且,模 擬狀態1~2並不滿足公式(1),模擬狀態3~5則滿足公式(1)。 Here, the "strength" of the above table represents the light intensity exhibited when viewed from the front of the optical element 2, and the "1/2 angle of view" represents the viewing angle when the light intensity is reduced to 1/2 of the intensity of the front view light. Moreover, the mode The pseudo state 1~2 does not satisfy the formula (1), and the simulation state 3~5 satisfies the formula (1).

因此,綜上所述,本領域具有通常知識者可藉由反射結構23之厚度來控制光線的光學路徑,且當光學元件2的設計滿足公式(1)時,其會有較佳的光學效果。 Therefore, in summary, those skilled in the art can control the optical path of the light by the thickness of the reflective structure 23, and when the design of the optical element 2 satisfies the formula (1), it has a better optical effect. .

以下,將對上述光學元件2的製造方法進行介紹,請參照圖4A~圖4E。首先,請參照圖4A,於一透明基材25的其中一側塗佈上一成型膠22’,此透明基材25的材質例如為聚碳酸酯(polycarbonate)、聚萘二甲酸乙二酯(polyethylene naphthalate,PEN)或聚對苯二甲酸乙二酯(polyethylene terephthalate,PET),而成型膠22’例如為紫外線硬化膠或熱塑性樹脂。 Hereinafter, a method of manufacturing the optical element 2 will be described. Please refer to FIGS. 4A to 4E. First, referring to FIG. 4A, a molding adhesive 22' is coated on one side of a transparent substrate 25. The transparent substrate 25 is made of, for example, polycarbonate or polyethylene naphthalate. Polyethylene naphthalate (PEN) or polyethylene terephthalate (PET), and the molding compound 22' is, for example, an ultraviolet curing rubber or a thermoplastic resin.

再來,提供一滾輪4,此滾輪4的表面41上具有多個成型圖案(未繪示),這些成型圖案的外型與光學元件2(如圖2所示)的微型結構22相對應。亦即,微型結構22呈向上凸出的形狀,而成型圖案則呈向下凹陷的形狀,彼此相互補。 Further, a roller 4 is provided. The surface 41 of the roller 4 has a plurality of molding patterns (not shown), and the shapes of the molding patterns correspond to the microstructures 22 of the optical element 2 (shown in FIG. 2). That is, the microstructures 22 have an upwardly convex shape, and the molding patterns have a downwardly concave shape and complement each other.

之後,請參照圖4B,當滾輪4於成型膠22’上壓印並對成型膠進行硬化後,便可於透明基材25上形成微型結構22。成型膠22’的硬化方式隨著成型膠22’之種類的不同而不同,例如若成型膠22’為紫外線硬化膠,則便是使用紫外線進行照射以使其成型,若成型膠22’為熱塑性樹脂,則便是使用加熱的方式使其成型。此外,在本實施例中,是使用滾輪4對成型 膠22’進行壓印,但本領域具有通常知識者可將滾輪4替換成其他型態的模具。 Thereafter, referring to Fig. 4B, when the roller 4 is embossed on the molding compound 22' and the molding gel is hardened, the microstructure 22 can be formed on the transparent substrate 25. The hardening manner of the molding adhesive 22' varies depending on the type of the molding adhesive 22'. For example, if the molding adhesive 22' is an ultraviolet curing adhesive, it is irradiated with ultraviolet rays to form it, if the molding adhesive 22' is thermoplastic. The resin is formed by heating. Further, in the present embodiment, the pair of rollers 4 are used for molding. The glue 22' is embossed, but those skilled in the art can replace the roller 4 with other types of molds.

再來,請參照圖4C,於完成微型結構22的製作後,於透明基材25另一側塗佈一光阻層。接著,塗佈光阻層後,進行曝光顯影製程,以形成一結構區域261,利用化學藥劑將結構區域261以外之光阻層去除,只留下結構區域261的部份。 Next, referring to FIG. 4C, after the fabrication of the microstructure 22 is completed, a photoresist layer is coated on the other side of the transparent substrate 25. Next, after the photoresist layer is applied, an exposure and development process is performed to form a structure region 261, and the photoresist layer other than the structure region 261 is removed by a chemical agent, leaving only a portion of the structure region 261.

再來,請參照圖4D,塗佈上一反射材料層23’,該反射材料層23’覆蓋結構區域261,且結構區域261之光阻層會與反射材料層23’產生鍵結。之後,請參照圖4E,將結構區域261之光阻層與位於其上的反射材料層23’去除,便可形成反射結構23。完成反射結構23的製作後,也就完成了本發明之光學元件2。 Next, referring to Fig. 4D, a reflective material layer 23' is coated, the reflective material layer 23' covers the structural region 261, and the photoresist layer of the structural region 261 is bonded to the reflective material layer 23'. Thereafter, referring to Fig. 4E, the photoresist layer of the structural region 261 and the reflective material layer 23' located thereon are removed to form the reflective structure 23. After the fabrication of the reflective structure 23 is completed, the optical component 2 of the present invention is completed.

請參閱圖5,圖5所繪示為使用本發明之光學元件的直下式背光模組。此背光模組5包括一擴散板51、多個光源52、一反射罩53與圖4所示之光學元件2,其中在本實施例中光源52為冷陰極螢光燈管,但也可將其改為發光二極體。光源52是配置在反射罩53內,反射罩53可將光源52所發出的光線反射至擴散板51中。擴散板51的作用是將光源52所發出的光線進行擴散,擴散板51的主要構成材質例如為聚甲基丙烯酸甲酯(poly methyl methacrylate)、聚碳酸酯或聚對苯二甲酸乙二酯等透明物質。而且,於擴散板51內則散佈有多個光擴散粒子(未繪示),此光擴散粒子之折射率與擴散板51的主要構成材質並 不相同,因此當光線通過光擴散粒子時,其光學路徑會產生偏折,從而達到使光線擴散的效果。 Please refer to FIG. 5. FIG. 5 illustrates a direct type backlight module using the optical component of the present invention. The backlight module 5 includes a diffusing plate 51, a plurality of light sources 52, a reflecting cover 53 and the optical element 2 shown in FIG. 4, wherein in the embodiment, the light source 52 is a cold cathode fluorescent tube, but It was changed to a light-emitting diode. The light source 52 is disposed in the reflective cover 53, and the reflective cover 53 reflects the light emitted by the light source 52 into the diffuser plate 51. The function of the diffusing plate 51 is to diffuse the light emitted from the light source 52. The main constituent material of the diffusing plate 51 is, for example, polymethyl methacrylate, polycarbonate or polyethylene terephthalate. Transparent substance. Further, a plurality of light-diffusing particles (not shown) are dispersed in the diffusion plate 51, and the refractive index of the light-diffusing particles and the main constituent materials of the diffusion plate 51 are Not the same, so when the light passes through the light-diffusing particles, the optical path will be deflected to achieve the effect of diffusing the light.

在圖5中,背光模組5為一直下式背光模組,但本發明之光學元件2也可用在其他型態的背光模組,例如:側光式背光模組。在側光式背光模組中,光學元件2是配置在導光板上。 In FIG. 5, the backlight module 5 is a direct-type backlight module, but the optical component 2 of the present invention can also be used in other types of backlight modules, such as an edge-lit backlight module. In the edge-lit backlight module, the optical element 2 is disposed on the light guide plate.

本發明以實施例說明如上,然其並非用以限定本發明所主張之專利權利範圍。其專利保護範圍當視後附之申請專利範圍及其等同領域而定。凡本領域具有通常知識者,在不脫離本專利精神或範圍內,所作之更動或潤飾,均屬於本發明所揭示精神下所完成之等效改變或設計,且應包含在下述之申請專利範圍內。 The present invention has been described above by way of examples, and is not intended to limit the scope of the claims. The scope of patent protection is subject to the scope of the patent application and its equivalent fields. Modifications or modifications made by those skilled in the art, without departing from the spirit or scope of the invention, are equivalent to the equivalents or modifications made in the spirit of the invention and should be included in the following claims. Inside.

1、1’‧‧‧增亮膜 1, 1'‧‧‧ Brightening film

11、11’‧‧‧棱鏡單元 11, 11' ‧ ‧ prism unit

13’‧‧‧反射結構 13’‧‧·reflective structure

L1‧‧‧第一光線 L1‧‧‧First light

L2‧‧‧第二光線 L2‧‧‧second light

24‧‧‧入光面 24‧‧‧Into the glossy

25‧‧‧透明基材 25‧‧‧Transparent substrate

261‧‧‧結構區域 261‧‧‧Structural area

4‧‧‧滾輪 4‧‧‧Roller

41‧‧‧表面 41‧‧‧ surface

L3‧‧‧第三光線 L3‧‧‧3rd light

2‧‧‧光學元件 2‧‧‧Optical components

21‧‧‧出光面 21‧‧‧Glossy

22‧‧‧微型結構 22‧‧‧Microstructure

22’‧‧‧成型膠 22'‧‧‧ molding gel

221‧‧‧頂邊 221‧‧‧ top side

222‧‧‧波谷 222‧‧‧ trough

2211‧‧‧第一曲線 2211‧‧‧First curve

2212‧‧‧第二曲線 2212‧‧‧second curve

23‧‧‧反射結構 23‧‧‧Reflective structure

23’‧‧‧反射材料層 23’‧‧·reflective material layer

5‧‧‧背光模組 5‧‧‧Backlight module

51‧‧‧擴散板 51‧‧‧Diffuser

52‧‧‧光源 52‧‧‧Light source

53‧‧‧反射罩 53‧‧‧reflector

R‧‧‧曲率半徑 R‧‧‧ radius of curvature

t‧‧‧厚度 T‧‧‧thickness

P‧‧‧寬度 P‧‧‧Width

n‧‧‧折射率 n‧‧‧Refractive index

D1、D2‧‧‧距離 D1, D2‧‧‧ distance

L4、L5‧‧‧光線 L4, L5‧‧‧ rays

圖1所繪示為US7309149中之增亮膜之部份剖視圖。 Figure 1 is a partial cross-sectional view of the brightness enhancing film of U.S. Patent No. 7,309,149.

圖2所繪示為本發明之第一實施例的光學元件。 2 is a view showing an optical element according to a first embodiment of the present invention.

圖3所繪示為頂邊於xy平面上的投影。 Figure 3 depicts the projection of the top edge on the xy plane.

圖4A~圖4E所繪示為光學元件的製造方法。 4A-4E illustrate a method of manufacturing an optical component.

圖5所繪示為本發明之第一實施例的背光模組。 FIG. 5 illustrates a backlight module according to a first embodiment of the present invention.

2‧‧‧光學元件 2‧‧‧Optical components

21‧‧‧出光面 21‧‧‧Glossy

22‧‧‧微型結構 22‧‧‧Microstructure

22’‧‧‧成型膠 22'‧‧‧ molding gel

221‧‧‧頂邊 221‧‧‧ top side

222‧‧‧波谷 222‧‧‧ trough

23‧‧‧反射結構 23‧‧‧Reflective structure

24‧‧‧入光面 24‧‧‧Into the glossy

R‧‧‧曲率半徑 R‧‧‧ radius of curvature

t‧‧‧厚度 T‧‧‧thickness

P‧‧‧寬度 P‧‧‧Width

L4、L5‧‧‧光線 L4, L5‧‧‧ rays

Claims (7)

一種光學元件,其具有一出光面與一入光面,且放置於入光面側之至少一光源所發出的光線會於該光學元件內部產生至少一光學路徑,該光學元件包括:多個微型結構,沿著一第一方向延伸且沿著一第二方向排列於該出光面上,每一該微型結構具有一頂邊,而該頂邊位於該出光面上並形成彼此相鄰的多條第一曲線與多條第二曲線,該第一曲線與該第二曲線往該第一方向延伸,該第一曲線與該第二曲線於該第二方向上之間距離不相等且不平行,且該第二曲線與另一第一曲線之該第二方向上之間距離不相等且不平行;多個反射結構,每一反射結構沿著該第一方向延伸且沿著該第二方向排列於該入光面上,且每一反射結構的位置與兩個微型結構的交接處相互對應,該反射結構的厚度t,該微型結構之底部的寬度P,與該光學元件的折射率n,滿足以下的公式: 其中,該光學路徑由該入光面入射,藉由該複數個反射結構之厚度以控制該光學路徑,且於該出光面上之該些微型結構是用於將該光學路徑進行收斂。 An optical component having a light exiting surface and a light incident surface, and the light emitted by the at least one light source disposed on the light incident surface side generates at least one optical path inside the optical component, the optical component comprising: a plurality of micro a structure extending along a first direction and arranged along a second direction on the light-emitting surface, each of the microstructures having a top edge, the top edge being located on the light-emitting surface and forming a plurality of adjacent ones a first curve and a plurality of second curves, wherein the first curve and the second curve extend in the first direction, and the distance between the first curve and the second curve in the second direction is unequal and non-parallel, And the distance between the second curve and the second curve in the second direction is unequal and non-parallel; a plurality of reflective structures each extending along the first direction and arranged along the second direction On the light incident surface, and the position of each reflective structure corresponds to the intersection of the two microstructures, the thickness t of the reflective structure, the width P of the bottom of the microstructure, and the refractive index n of the optical element, Meet the following formula The optical path is incident on the light incident surface, and the optical path is controlled by the thickness of the plurality of reflective structures, and the micro structures on the light emitting surface are used to converge the optical path. 如申請專利範圍第1項所述之光學元件,其中該微型 結構之縱向剖面的輪廓為一弧線,該弧線的曲率半徑R,及該第一曲線與該第二曲線於該第二方向上之距離D,滿足以下的公式:0.5R<D<3R。 An optical component according to claim 1, wherein the micro component The profile of the longitudinal section of the structure is an arc, the radius of curvature R of the arc, and the distance D between the first curve and the second curve in the second direction satisfy the following formula: 0.5R<D<3R. 如申請專利範圍第1項所述之光學元件,其中該微型結構的焦距FD與該微型結構之底部的寬度P,滿足以下的公式: The optical component according to claim 1, wherein the focal length FD of the microstructure and the width P of the bottom of the microstructure satisfy the following formula: 一種背光模組,該背光模組包括:一光學薄板;至少一光源,放置在該光學薄板的入光側;以及如申請專利範圍第1項至第3項的任一項所述之一光學元件,該光學元件放置於該光學薄板的出光面側。 A backlight module comprising: an optical sheet; at least one light source disposed on a light incident side of the optical sheet; and one of the optical materials according to any one of claims 1 to 3 An element placed on a light-emitting surface side of the optical sheet. 如申請專利範圍第9項所述之背光模組,其中該光學薄板為一擴散板。 The backlight module of claim 9, wherein the optical sheet is a diffuser. 如申請專利範圍第9項所述之背光模組,其中該光學薄板為一導光板。 The backlight module of claim 9, wherein the optical sheet is a light guide plate. 如申請專利範圍第9項所述之背光模組,其中該光源為冷陰極螢光燈管或發光二極體。 The backlight module of claim 9, wherein the light source is a cold cathode fluorescent tube or a light emitting diode.
TW98101955A 2009-01-19 2009-01-19 Optical element, manufacturing method thereof, and a backlight module TWI393921B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200632369A (en) * 2005-01-31 2006-09-16 Toppan Printing Co Ltd Optical sheet, backlight unit and display
TWM313787U (en) * 2006-08-11 2007-06-11 Eternal Chemical Co Ltd Optical film
TW200730958A (en) * 2005-10-10 2007-08-16 Eastman Kodak Co Blacklight unit with linearly reduced divergence
TW200841090A (en) * 2007-03-30 2008-10-16 Lg Display Co Ltd Backlight unit and liquid crystal display device having the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200632369A (en) * 2005-01-31 2006-09-16 Toppan Printing Co Ltd Optical sheet, backlight unit and display
TW200730958A (en) * 2005-10-10 2007-08-16 Eastman Kodak Co Blacklight unit with linearly reduced divergence
TWM313787U (en) * 2006-08-11 2007-06-11 Eternal Chemical Co Ltd Optical film
TW200841090A (en) * 2007-03-30 2008-10-16 Lg Display Co Ltd Backlight unit and liquid crystal display device having the same

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