JP2011059530A

JP2011059530A - Optical thin plate

Info

Publication number: JP2011059530A
Application number: JP2009211020A
Authority: JP
Inventors: Chun Wei Wang; 王君偉; Wen-Feng Cheng; 鄭文峰; Chih Wei Huang; 黄致維
Original assignee: Entire Technology Co Ltd
Current assignee: Entire Technology Co Ltd
Priority date: 2009-09-11
Filing date: 2009-09-11
Publication date: 2011-03-24

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical thin plate, capable of not only controlling the diffusion angle of light beam but also attaining the effect of sufficiently mixing of light beams. <P>SOLUTION: The optical thin plate includes a body and a structural surface layer. The body includes a flat surface, a base part and an upper part. The structural surface layer has a plurality of recess-like structures disposed adjacent to one another. The recess-like structures are set on the flat surface, and each of the recess-like structure includes at least two first curved surfaces and at least two second curved surfaces, with the first curved surfaces extending to the base part, and the second curved surfaces extending to the base part. Each of the first curved surfaces and of the first curved surface adjacent thereto of the other recess-like structure are mutually connected at an upper portion, to form a first arcuate surface, and each of the second curved surfaces and the second curved surface adjacent thereto of the other recess-like structure are mutually connected at the upper part, to form a second arcuate face. The optical thin plate can attain proper diffusion effect and obtains satisfactory luminance uniformity, and is able to avoid scratches on a brightening film or on other optical films. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、光学薄板に関し、特に複数の凹状構造を有する光学薄板に関する。 The present invention relates to an optical thin plate, and more particularly to an optical thin plate having a plurality of concave structures.

現在、液晶ディスプレイと関連する技術は、急激に進歩し、液晶ディスプレイの販売価格を徐々に下降させているだけでなく、そのディスプレイも従来のＣＲＴディスプレイに徐々に迫っている。一般的に、液晶ディスプレイは、バックライトモジュール(backlight module)及び液晶パネル(LCD panel)を含み、バックライトモジュールは、画面を表示する時に必要な光線を提供することに用い、液晶パネルは、その内部の液晶の配列方式を変化させることにより光線を通過させるかを制御することができる。図1において、図1が示すのは、市場における液晶ディスプレイの各部材の説明図である。この液晶ディスプレイ１は、バックライトモジュール１１及び液晶パネル１２を含み、このバックライトモジュール１１は、反射マスク１１１と、複数の灯源１１２と、拡散板１１３と、増光膜１１４と、を含み、そのうち、灯源１１２は、反射マスク１１１内に配置され、拡散板１１３の作用は、灯源１１２が発する光線を拡散することであり、増光膜１１４は、拡散した光線を収束する（condense）ことに用いるものである。 At present, the technology related to the liquid crystal display is making rapid progress, not only gradually lowering the selling price of the liquid crystal display, but also the display is gradually approaching the conventional CRT display. Generally, a liquid crystal display includes a backlight module and a liquid crystal panel (LCD panel), and the backlight module is used to provide light necessary for displaying a screen. It is possible to control whether the light beam is allowed to pass by changing the internal liquid crystal alignment method. In FIG. 1, FIG. 1 is an explanatory diagram of each member of a liquid crystal display in the market. The liquid crystal display 1 includes a backlight module 11 and a liquid crystal panel 12. The backlight module 11 includes a reflection mask 111, a plurality of light sources 112, a diffusion plate 113, and a light enhancement film 114, of which The lamp source 112 is disposed in the reflection mask 111, and the action of the diffusion plate 113 is to diffuse the light emitted from the lamp source 112, and the light-intensifying film 114 condenses the diffused light. It is what is used.

拡散板１１３の主要な構成材質は、例えば、ポリメチルメタクリレート(poly methyl methacrylate)、ポリカーボネート(polycarbonate)またはポリエチレンテレフタレート(Polyethylene Terephthalate)等の透明物質であり、且つ拡散板１１３内は、複数の光拡散粒子（図示せず）を散布し、この光拡散粒子の屈折率及び拡散板１１３の主要な構成材質は異なるものであるので、光線が拡散板１１３及び拡散粒子の境界面を通過する時、その進行方向は、屈折を生じ、それにより光線を拡散させる効果を達成する。 The main constituent material of the diffusion plate 113 is, for example, a transparent material such as polymethyl methacrylate, polycarbonate, or polyethylene terephthalate, and the diffusion plate 113 has a plurality of light diffusions. Since particles (not shown) are dispersed and the refractive index of the light diffusing particles and the main constituent materials of the diffusing plate 113 are different, when the light beam passes through the boundary surface between the diffusing plate 113 and the diffusing particles, The traveling direction achieves the effect of causing refraction and thereby diffusing the light rays.

液晶ディスプレイがリビングに置かれるテレビに用いられる時、それは、ディスプレイ前方（例えば、位置Ａ）に位置する使用者がはっきりと見ることができるようにするだけでなく、同時にディスプレイの側方（例えば、位置Ｂ）に位置する使用者もはっきりと見ることができるようにする必要があるので、その光の拡散角度は、十分に大きくなければならない。反対に、液晶ディスプレイがオフィスのデスク前に置かれ、パソコンのディスプレイとして用いられる時、ディスプレイ正面（例えば、位置Ａ）に位置する使用者がはっきりと見ることができるだけでよいので、その光の拡散角度は、比較的小さくてよい。しかしながら、光拡散粒子は、拡散板１１３内の散布方式が不規則であるので、光線の拡散角度を精確に制御することができない。 When a liquid crystal display is used in a television set in a living room, it not only allows a user located in front of the display (eg, position A) to see clearly, but at the same time the side of the display (eg, Since it is necessary to be able to see clearly the user located at position B), the diffusion angle of the light must be sufficiently large. Conversely, when a liquid crystal display is placed in front of an office desk and used as a personal computer display, its light diffusion is only visible to the user located in front of the display (eg, position A). The angle may be relatively small. However, since the light diffusion particles are irregularly distributed in the diffusion plate 113, the light diffusion angle cannot be accurately controlled.

従って、光線の角度を如何に精確に制御するかは、当業者が思量するに値する問題である。米国特許ＵＳ７３２０５３８において、図2に示すような光学薄板２が開示されている。該光学薄板２は、主体層２２と構造表面層２１を含み、この構造表面層２１は、粘着層２９により主体層２２の上方に設置されるものである。構造表面層２１上に複数の凹状構造２４を設置し、各凹状構造２４は、２つの第１表面２４Ａ及び２つの第２表面２４Ｂを含む。光線が該第１表面２４Ａ又は第２表面２４Ｂを通過する時、入射角度を有するので、屈折又は全反射を発生する。米国特許ＵＳ７３２０５３８の光学薄板２も、２つの第１表面２４Ａ及び２つの第２表面２４Ｂにより、凹状構造２４を通過する光線の拡散角度を変化させている。 Therefore, how to precisely control the angle of the light beam is a problem that would be deduced by those skilled in the art. In US Pat. No. 7,032,538, an optical thin plate 2 as shown in FIG. 2 is disclosed. The optical thin plate 2 includes a main layer 22 and a structural surface layer 21, and the structural surface layer 21 is disposed above the main layer 22 by an adhesive layer 29. A plurality of concave structures 24 are installed on the structural surface layer 21, and each concave structure 24 includes two first surfaces 24A and two second surfaces 24B. When the light ray passes through the first surface 24A or the second surface 24B, it has an incident angle, and therefore refraction or total reflection occurs. The optical thin plate 2 of US Pat. No. 7,032,538 also changes the diffusion angle of the light beam passing through the concave structure 24 by the two first surfaces 24A and the two second surfaces 24B.

しかしながら、上記の光学薄板２は、大きな欠陥が存在する。第１表面２４Ａが平面であるので、光線は、該第１表面２４Ａを通過した後、その射出する光線は、相互に平行であり、従って、良好な拡散効果を達成することができない。同様に、該第２表面２４Ｂも良好な拡散効果を達成することができない。この場合、液晶ディスプレイの輝度(Brightness)が十分に均一でなく、消費者が購買する意欲を低下させる。また、相互に隣接する凹状構造２４の間の隣接箇所２４４は、鋭利な尖角を呈するので、図１に示すような増光膜１１４またはその他の種類の光学膜がその上に置かれる時、容易にスクラッチが発生する。 However, the optical thin plate 2 has a large defect. Since the first surface 24A is planar, the light rays after passing through the first surface 24A are parallel to each other and therefore a good diffusion effect cannot be achieved. Similarly, the second surface 24B cannot achieve a good diffusion effect. In this case, the brightness of the liquid crystal display is not sufficiently uniform, which reduces the consumer's willingness to purchase. Also, the adjacent locations 244 between the adjacent concave structures 24 exhibit a sharp cusp, so that it is easy when a light-intensifying film 114 or other type of optical film as shown in FIG. 1 is placed thereon. Scratches occur.

従って、光学薄板の輝度の均一度を如何に増加し、その他の光学膜をスクラッチする確率を低下するかは、当業者の努力の目標となっている。 Therefore, how to increase the brightness uniformity of the optical thin plate and reduce the probability of scratching other optical films is the goal of those skilled in the art.

米国特許ＵＳ７３２０５３８US patent US7320538

本発明の目的は、光線の拡散角度を制御できるだけでなく、更に光線を十分に混合する効果を達成することができる光学薄板を提供することにある。 An object of the present invention is to provide an optical thin plate that can not only control the diffusion angle of light rays but also achieve the effect of sufficiently mixing the light rays.

上記の目的を達成する為、本発明が提供する光学薄板は、光線の拡散角度を調整制御することに用い、該光学薄板は、本体と構造表面層を含む。そのうち、該本体は、平面と、ベース部と、上部と、を含み、該平面、該ベース部及び上部は、相互に交わり合う。該構造表面層は、複数の相互に隣接して寄り合う凹状構造を有し、該凹状構造は、該平面上に設置され、各凹状構造は、少なくとも２つの相互に対向する第１曲面及び少なくとも２つの相互に対向する第２曲面を有し、該第１曲面は、該ベース部に延伸し、且つ該第２曲面は、該ベース部に延伸する。該第１曲面及び他の相互に隣接する凹状構造の第１曲面は、該上部の箇所で相互に接続し、第１弧面を形成し、該第２曲面及び他の相互に隣接する凹状構造の第２曲面は、該上部の箇所で相互に接続し、第２弧面を形成する。このように、本発明の光学薄板は、良好な拡散効果を達成し、良好な輝度均一度を得ることができ、且つ増光膜又はその他の光学膜をスクラッチすることを回避する。 In order to achieve the above object, the optical thin plate provided by the present invention is used for adjusting and controlling the diffusion angle of light, and the optical thin plate includes a main body and a structural surface layer. The main body includes a flat surface, a base portion, and an upper portion, and the flat surface, the base portion, and the upper portion intersect each other. The structural surface layer has a plurality of adjacent concave structures that are disposed on the plane, each concave structure having at least two first curved surfaces facing each other and at least The second curved surface has two mutually opposed second curved surfaces, the first curved surface extends to the base portion, and the second curved surface extends to the base portion. The first curved surface and the first curved surface of the other concave structure adjacent to each other are connected to each other at the upper portion to form a first arc surface, and the second curved surface and the other concave structure adjacent to each other. The second curved surfaces are connected to each other at the upper portion to form a second arc surface. Thus, the optical thin plate of the present invention can achieve a good diffusion effect, obtain a good luminance uniformity, and avoid scratching the light-intensifying film or other optical films.

上記の光学薄板は、そのうち、各凹状構造の上部が台形、長方形、菱形又は正方形に包囲形成するものである。 In the above optical thin plate, the upper part of each concave structure is surrounded by a trapezoid, rectangle, rhombus or square.

上記の光学薄板は、そのうち、該ベース部が点状、平面状又は弧面状を呈するものである。 Among the above optical thin plates, the base portion has a dot shape, a planar shape, or an arc surface shape.

上記の光学薄板は、そのうち、該光学薄板が、主体層及び基底層を更に含み、該主体層が該構造表面層の下方に位置し、該主体層内部に複数の拡散粒子を分布し、該光拡散粒子の屈折率及び該主体層の屈折率が異なるものである。該基底層は、該主体層の下方に位置し、該基底層は、紫外光吸収剤を含む。 Of the optical thin plate, the optical thin plate further includes a main layer and a base layer, the main layer is located below the structural surface layer, and a plurality of diffusion particles are distributed inside the main layer, The refractive index of the light diffusing particles and the refractive index of the main layer are different. The base layer is located below the main layer, and the base layer includes an ultraviolet light absorber.

上記の光学薄板は、そのうち、２つの第１曲面が該ベース部に相互に対称である。 Among the above optical thin plates, two first curved surfaces are symmetrical to the base portion.

上記の光学薄板は、そのうち、２つの第２曲面が該ベース部に相互に対称である。 Of the optical thin plate, two second curved surfaces are symmetrical to the base portion.

上記の目的を達成する為、本発明が提供する他の光学薄板は、光線の拡散角度を調整制御することに用い、該光学薄板は、本体及び構造表面層を含む。そのうち、該本体は、平面及び上部を含む。該構造表面層は、複数の相互に隣接して寄り合う凹状構造を含み、該該凹状構造は、該平面上に設置され、各凹状構造は、第１曲面及び少なくとも２つの相互に対向する第２曲面を有し、該第１曲面は、下向に延伸し、且つ該第２曲面と相互に隣接する。該第１曲面及び他の相互に隣接する凹状構造の第１曲面は、該上部の箇所で相互に接続し、第１弧面を形成し、該第２曲面及び他の相互に隣接する凹状構造の第２曲面は、該上部の箇所で相互に接続し、第２弧面を形成する。このように、本発明の光学薄板は、良好な拡散効果を達成し、良好な輝度均一度を得ることができ、且つ増光膜又はその他の光学膜をスクラッチすることを回避する。 In order to achieve the above object, another optical thin plate provided by the present invention is used for adjusting and controlling a light diffusion angle, and the optical thin plate includes a main body and a structural surface layer. The main body includes a plane and an upper part. The structural surface layer includes a plurality of adjacent concave structures that are disposed on the plane, each concave structure having a first curved surface and at least two mutually opposite first structures. The first curved surface extends downward and is adjacent to the second curved surface. The first curved surface and the first curved surface of the other concave structure adjacent to each other are connected to each other at the upper portion to form a first arc surface, and the second curved surface and the other concave structure adjacent to each other. The second curved surfaces are connected to each other at the upper portion to form a second arc surface. Thus, the optical thin plate of the present invention can achieve a good diffusion effect, obtain a good luminance uniformity, and avoid scratching the light-intensifying film or other optical films.

上記の光学薄板は、そのうち、２つの第２曲面が該第１曲面に相互に対称である。 Among the optical thin plates, two of the second curved surfaces are symmetrical to the first curved surface.

このように、本発明の光学薄板は、該第１曲面及び該第２曲面が曲面であるので、その上の各点の接線傾斜率が何れも異なり、従って、相互に平行な光線が第１表面を貫通した後、その進行方向は、平行を保持しない。従って、本発明の光学薄板は、通過した光線に十分混合した効果を達成させることができる。 As described above, in the optical thin plate of the present invention, since the first curved surface and the second curved surface are curved surfaces, the tangential inclination rates of the respective points on the first curved surface and the second curved surface are different from each other. After penetrating the surface, its direction of travel does not remain parallel. Therefore, the optical thin plate of the present invention can achieve the effect of being sufficiently mixed with the passed light beam.

市場における液晶ディスプレイの各部材の説明図である。It is explanatory drawing of each member of the liquid crystal display in a market. 米国特許ＵＳ７３２０５３８中に開示される光学薄板を示す図である。It is a figure which shows the optical thin plate disclosed in US Patent US7320538. 本発明の第１実施例の光学薄板の断面図である。It is sectional drawing of the optical thin plate of 1st Example of this invention. 本発明の第１実施例の構造表面層の説明図である。It is explanatory drawing of the structure surface layer of 1st Example of this invention. 本発明の第１実施例の２つの相互に隣接する凹状構造の説明図である。It is explanatory drawing of two mutually adjacent concave structure of 1st Example of this invention. 光学シミュレーションを行う各設備の配置図である。It is a layout view of each facility that performs optical simulation. 本発明の光学薄板の光学シミュレーションを示す図である。It is a figure which shows the optical simulation of the optical thin plate of this invention. 従来の光学薄板の光学シミュレーションを示す図である。It is a figure which shows the optical simulation of the conventional optical thin plate. 本発明の第１実施例の凹状構造の俯瞰図である。It is an overhead view of the concave structure of 1st Example of this invention. 本発明の第２実施例の凹状構造の俯瞰図である。It is an overhead view of the concave structure of the second embodiment of the present invention. 本発明の第３実施例の凹状構造の俯瞰図である。It is an overhead view of the concave structure of the third embodiment of the present invention. 本発明の第４実施例の凹状構造の俯瞰図である。It is an overhead view of the concave structure of the fourth embodiment of the present invention. 本発明の第５実施例の光学薄板の俯瞰図である。It is an overhead view of the optical thin plate of 5th Example of this invention. 本発明の第５実施例の凹状構造の俯瞰図である。It is an overhead view of the concave structure of the fifth embodiment of the present invention. 本発明の第５実施例の凹状構造のＢ−Ｂ断面図である。It is BB sectional drawing of the concave structure of 5th Example of this invention. 本発明の第５実施例の凹状構造のＣ−Ｃ断面図である。It is CC sectional drawing of the concave structure of 5th Example of this invention. 本発明の第６実施例の凹状構造の俯瞰図である。It is an overhead view of the concave structure of the sixth embodiment of the present invention. 本発明の第７実施例の凹状構造の俯瞰図である。It is an overhead view of the concave structure of the seventh embodiment of the present invention.

本発明の上記目的、特徴及び利点をより分かり易くするため、実施例を挙げ、図面に併せて以下に詳細に説明する。 In order to make the above objects, features and advantages of the present invention easier to understand, examples will be given and described in detail below in conjunction with the drawings.

図３は、本発明の第１実施例の第１実施例の光学薄板の断面図である。図３に示すように、該光学薄板３は、光線の拡散角度を調整制御することに用い、それは、構造表面３１と、主体層３２と、基底層３３と、を含む。そのうち、該主体層３２は、該構造表面層３１の下方に位置し、該主体層３２内部に複数の光拡散粒子（図示せず）を分布し、該光拡散粒子の屈折率は、該主体層３２の屈折率と異なるので、光線が主体層３２及び光拡散粒子の境界面を通過する時、その進行方向は、屈折及び散乱を発生し、それにより、光線を拡散させる効果を達成する。該基底層３３は、該主体層３２の下方に位置し、該基底層３３は、紫外光吸収剤を含むので、該基底層３３は、紫外光を吸収する機能を有し、光学薄板３の老化現象を緩和することができる。また、当業者は、可視状況で構造表面層３１内に少量の紫外光吸収剤を添加する。 FIG. 3 is a sectional view of the optical thin plate of the first embodiment of the first embodiment of the present invention. As shown in FIG. 3, the optical thin plate 3 is used to adjust and control the diffusion angle of light rays, and includes a structural surface 31, a main layer 32, and a base layer 33. Among them, the main layer 32 is located below the structural surface layer 31, and a plurality of light diffusion particles (not shown) are distributed inside the main layer 32, and the refractive index of the light diffusion particles is determined by the main layer 32. Since the refractive index of the layer 32 is different, when the light beam passes through the boundary surface between the main layer 32 and the light diffusing particles, its traveling direction generates refraction and scattering, thereby achieving the effect of diffusing the light beam. The base layer 33 is located below the main layer 32. Since the base layer 33 contains an ultraviolet light absorber, the base layer 33 has a function of absorbing ultraviolet light, and the optical thin plate 3 Aging phenomenon can be alleviated. Moreover, those skilled in the art add a small amount of ultraviolet light absorber in the structural surface layer 31 in a visible state.

続いて、図４及び図５を同時に参照し、図４が示すのは、本発明の第１実施例の構造表面の説明図である。図５が示すのは、本発明の第１実施例の２つの相互に隣接する凹状構造の説明図である。図３の光学薄板３の上方は、該構造表面層３１及び本体３５から構成される。そのうち、該本体３５は、平面３４と、ベース部３５５と、上部３５３と、を含み、該平面３５４と、該ベース部３５５と、該上部３５３とは、相互に交わり合わない。該構造表面層３１は、相互に隣接して寄り合う複数の凹状構造３４を含み、該凹状構造３４は、該平面３５４上に設置される。各凹状構造３４は、２つの相互に対向する第１曲面３４１及び２つの相互に対向する第２曲面３４２を有し、且つ２つの第１曲面３４１は、該ベース部３５５に延伸し、該ベース部３５５に相互に対称であり、２つの第２曲面３４２は、該ベース部３５５に延伸し、ベース部３５５に相互に対称である。ここでは、該ベース部３５５が１つの点である。該第１曲面３４１及び他の相互に隣接する凹状構造３４の第１曲面３４１は、該上部３５３の箇所で相互に接続し、第１弧面３５１を形成し、該第２曲面３４２及び他の相互に隣接する凹状構造３４の第２曲面３４２は、該上部３５３の箇所で相互に接続し、第２弧面３５２を形成する。図４及び図５から分かるように、２つの第１曲面３４１及び２つの第２曲面３４２上の各点の接線傾斜率は、位置により異なるので、相互に平行な光線が該構造表面層３１を通過した後、その進行方向は、平行を保持しない。これにより、凹状構造３４の光線拡散角度を調整し、光線を十分に混合させ、輝度の均一度を向上することができる。 Next, referring to FIG. 4 and FIG. 5 at the same time, FIG. 4 is an explanatory view of the structural surface of the first embodiment of the present invention. FIG. 5 shows an explanatory diagram of two mutually adjacent concave structures according to the first embodiment of the present invention. The upper part of the optical thin plate 3 in FIG. 3 includes the structural surface layer 31 and the main body 35. The main body 35 includes a flat surface 34, a base portion 355, and an upper portion 353, and the flat surface 354, the base portion 355, and the upper portion 353 do not intersect with each other. The structural surface layer 31 includes a plurality of concave structures 34 adjacent to each other, and the concave structures 34 are installed on the flat surface 354. Each concave structure 34 has two mutually opposite first curved surfaces 341 and two mutually opposite second curved surfaces 342, and the two first curved surfaces 341 extend to the base portion 355, and the base The second curved surface 342 extends symmetrically to the base portion 355 and is symmetrical to the base portion 355. Here, the base portion 355 is one point. The first curved surface 341 and the first curved surface 341 of the other concave structure 34 adjacent to each other are connected to each other at the upper portion 353 to form a first arc surface 351, and the second curved surface 342 and the other curved surface 341. The second curved surfaces 342 of the concave structures 34 adjacent to each other are connected to each other at the upper portion 353 to form a second arc surface 352. As can be seen from FIG. 4 and FIG. 5, the tangential slope rate of each point on the two first curved surfaces 341 and the two second curved surfaces 342 varies depending on the position, so that light rays parallel to each other pass through the structural surface layer 31. After passing, its traveling direction does not keep parallel. Thereby, the light diffusion angle of the concave structure 34 can be adjusted, the light rays can be sufficiently mixed, and the luminance uniformity can be improved.

また、２つの凹状構想３４が接する箇所の第１弧面３５１及び第２弧面３５２は、弧状を呈するので、鋭利な尖角を発生しない。このように、増光膜又はその他の種類の光学膜が該光学薄板３上に置かれる場合、スクラッチが発生し難い。また、上記の光学薄板３は、鋳型中において成型を行う時、その相互に隣接する箇所が弧状に設計することも光学薄板３に製造完成後、鋳型中から抜き易くすることができる。 Moreover, since the 1st arc surface 351 and the 2nd arc surface 352 of the location which the two concave-shaped concept 34 contact | connect show arc shape, a sharp cusp angle does not generate | occur | produce. In this way, when a light-intensifying film or other type of optical film is placed on the optical thin plate 3, scratches are unlikely to occur. In addition, when the optical thin plate 3 is molded in the mold, it is possible to easily design the portions adjacent to each other in an arc shape after the optical thin plate 3 is manufactured.

続いて、本発明の光学薄板３が達成する効果を実証するため、本発明の凹状構造３４に対して光学シミュレーションを行う。図６は、光学シミュレーションを行う各設備の配置図である。そのうち、凹状構造３４は、光源９６及びスクリーン９５の間に置かれ、光源６が発する光線が凹状構造３４を経過した後、スクリーン９５上に投影される。その投影の結果は、図７Ａに示すようである。この光学シミュレーションにおいて、光源９６がＬＥＤ灯であり、それが発する光線の光強度及び垂直方向の挟み角θが以下の関係を呈する：
I=A*cosθ、そのうち、Iが光強度であり、Aが常数である。 Subsequently, in order to verify the effect achieved by the optical thin plate 3 of the present invention, an optical simulation is performed on the concave structure 34 of the present invention. FIG. 6 is a layout diagram of each facility for performing an optical simulation. Among them, the concave structure 34 is placed between the light source 96 and the screen 95, and light rays emitted from the light source 6 are projected on the screen 95 after passing through the concave structure 34. The result of the projection is as shown in FIG. 7A. In this optical simulation, the light source 96 is an LED lamp, and the light intensity emitted by the light source 96 and the vertical angle of sandwiching θ have the following relationship:
I = A * cos θ, where I is the light intensity and A is a constant.

従来の光学薄板２の光学拡散効果と比較を行う為、ここでは、凹状構造３４を図２に示す凹状構造２４に置き換え、シミュレーションを行い、その投影の結果は、図７Ｂに示すようである。図７Ａ及び図７Ｂにおいて、色が深いほど、輝度 (Brightness)が強いことを表す。そのうち、図７Ａの均一度が７８％であり、図７Ｂの均一度が６９．５％である。ここでは、均一度は、（最大輝度-最小輝度）/最大輝度を指す。従って、図７Ａ及び図７Ｂから、本発明の凹状構造３４が良好な光学拡散効果を有し、比較的均一な輝度分布を呈することができることが明らかである。 In order to make a comparison with the optical diffusion effect of the conventional optical thin plate 2, here, the concave structure 34 is replaced with the concave structure 24 shown in FIG. 2, and a simulation is performed. The result of the projection is as shown in FIG. 7B. 7A and 7B, the deeper the color, the stronger the brightness (Brightness). Among them, the uniformity of FIG. 7A is 78%, and the uniformity of FIG. 7B is 69.5%. Here, the uniformity refers to (maximum luminance-minimum luminance) / maximum luminance. 7A and 7B, it is clear that the concave structure 34 of the present invention has a good optical diffusion effect and can exhibit a relatively uniform luminance distribution.

上記実施例の凹状構造３４は、その俯瞰図、即ち、図８Ａに示すように、その上部３５３は、正方形に包囲形成される。しかしながら、当業者は、それを台形又は菱形に設計することができ、その台形又は菱形の構造は、図８Ｂ及び図８Ｃに示す凹状構造５４の通りである。また、図４及び図５のようなベース部３５５は、該第１曲面３４１及び第２曲面３４２から下向に延伸し、相互に接し、１つの点を形成する。しかしながら、図８Ｄにおいて、該凹状構造６４のベース部６５５が平面状又は弧面状であり、このように、依然として前記の効果を達成することができる。 As shown in FIG. 8A, the concave structure 34 of the above embodiment is surrounded by a square. However, those skilled in the art can design it into a trapezoid or rhombus, the trapezoid or rhombus structure being as in the concave structure 54 shown in FIGS. 8B and 8C. Also, the base portion 355 as shown in FIGS. 4 and 5 extends downward from the first curved surface 341 and the second curved surface 342 and is in contact with each other to form one point. However, in FIG. 8D, the base portion 655 of the concave structure 64 is planar or arcuate, thus still achieving the above effects.

また、本発明は、更にその他の実施例を有する。図９、図１０Ａ〜図１０Ｃにおいて、図９が示すのは、本発明の第５実施例の光学薄板の俯瞰図であり、図１０Ａが示すのは、本発明の第５実施例の凹状構造の俯瞰図であり、図１０Ｂが示すのは、本発明の実施例の凹状構造のＢ−Ｂ断面図であり、図１０Ｃが示すのは、本発明の第５実施例の凹状構造のＣ−Ｃ断面図である。そのうち、図１０Ａ中のＢ−Ｂ断面及Ｃ−Ｃ断面は、それぞれ、図１０Ｂ及び図１０Ｃに示す通りである。図に示すように、本実施例の光学薄板７の上方は、構造表面層（図示せず）及び本体７５から構成される。そのうち、該本体７５は、平面７５４及び上部７５３を含み、該構造表面層は、複数の相互に寄り合う凹状構造７４を含み、該凹状構造７４は、該平面７５４上に設置される。各凹状構造７４は、第１曲面７４１及び２つの相互に対向する第２曲面７４２を有し、該第１曲面７４１は、下向に延伸し、且つ２つの第２曲面７４２と相互に隣接し、且つ２つの凹状構造７４２は、該第１曲面７４１に相互に対称である。該第１曲面７４１及び他の相互に隣接する凹状構造７４の第１曲面７４１が該上部７５３の箇所で相互に接続し、第１弧面７５１を形成し、該第２曲面７４２及び他の相互に隣接する凹状構造７４の第２曲面７４２が該上部７５３の箇所で相互に接続し、第２弧面７５２を形成する。このように、本実施例も前記の効果を達成することができる。 The present invention further includes other embodiments. 9 and 10A to 10C, FIG. 9 shows an overhead view of the optical thin plate of the fifth embodiment of the present invention, and FIG. 10A shows the concave structure of the fifth embodiment of the present invention. FIG. 10B shows a sectional view taken along the line B-B of the concave structure of the embodiment of the present invention, and FIG. 10C shows the C- of the concave structure of the fifth embodiment of the present invention. It is C sectional drawing. Among them, the BB cross section and CC cross section in FIG. 10A are as shown in FIGS. 10B and 10C, respectively. As shown in the drawing, the upper part of the optical thin plate 7 of this embodiment is composed of a structural surface layer (not shown) and a main body 75. The main body 75 includes a plane 754 and an upper portion 753, and the structural surface layer includes a plurality of mutually facing concave structures 74, which are disposed on the plane 754. Each concave structure 74 has a first curved surface 741 and two mutually opposite second curved surfaces 742, and the first curved surface 741 extends downward and is adjacent to the two second curved surfaces 742. The two concave structures 742 are symmetrical to each other with respect to the first curved surface 741. The first curved surface 741 and the other first curved surface 741 of the concave structure 74 adjacent to each other are connected to each other at the upper portion 753 to form the first arc surface 751, and the second curved surface 742 and the other mutual curved surface 741. The second curved surfaces 742 of the concave structures 74 adjacent to each other are connected to each other at the upper portion 753 to form a second arc surface 752. Thus, the present embodiment can also achieve the above effects.

当然、当業者は、上記第５実施例の凹状構造設計を台形又は菱形に設計することができ、その台形又は菱形の構造は、図１１Ａ及び図１１Ｂが示す凹状構造８４及び凹状構造９４のようであり、前記の効果を達成することができる。 Of course, those skilled in the art can design the concave structure design of the fifth embodiment to be trapezoidal or diamond-shaped, and the trapezoidal or diamond-shaped structure is like the concave structure 84 and the concave structure 94 shown in FIGS. 11A and 11B. And the above-mentioned effects can be achieved.

上記のように、本発明の光学薄板は、輝度の均一度を増加し、その他の光学膜又は増光膜をスクラッチする確率を低下し、且つ成型後の型抜きを容易にすることができるので、極めて大きな商業利益を有する。 As described above, the optical thin plate of the present invention increases the uniformity of brightness, decreases the probability of scratching other optical films or brightening films, and facilitates the release after molding. Has a very large commercial interest.

なお、本発明では好ましい実施例を前述の通り開示したが、これらは決して本発明に限定するものではなく、当該技術を熟知する者なら誰でも、本発明の精神と領域を脱しない均等の範囲内で各種の変動や潤色を加えることができることは勿論である。 In the present invention, the preferred embodiments have been disclosed as described above, but these are not intended to limit the present invention in any way, and anyone who is familiar with the technology can make an equivalent scope without departing from the spirit and scope of the present invention. Of course, various fluctuations and hydration colors can be added.

＜従来技術＞
１液晶ディスプレイ
１１バックライトモジュール
１１１反射マスク
１１２灯源
１１３拡散板
１１４増光膜
１２液晶パネル
２光学薄板
２１構造表面層
２２主体層
２４凹状構造
２４４隣接箇所
２４Ａ第１表面
２４Ｂ第２表面
２９粘着層
Ａ，Ｂ位置
＜本発明＞
３，1 光学薄板
３１構造表面層
３２主体層
３３基底層
３４,４４，５４，６４，７４，８４，９４凹状構造
３４１，７４１第１曲面
３４２，７４２第２曲面
３５，７５本体
３５１，７５１第１弧面
３５２，７５２第２弧面
３５３，７５３上部
３５４，７５４平面
３５５，６５５ベース部
９５スクリーン
９６光源
θ 挟み角 <Conventional technology>
DESCRIPTION OF SYMBOLS 1 Liquid crystal display 11 Backlight module 111 Reflection mask 112 Light source 113 Diffusing plate 114 Brightening film 12 Liquid crystal panel 2 Optical thin plate 21 Structure surface layer 22 Main layer 24 Concave structure 244 Adjacent location 24A 1st surface 24B 2nd surface 29 Adhesive layer A , B position <present invention>
3,1 Optical thin plate 31 Structure surface layer 32 Main layer 33 Base layers 34, 44, 54, 64, 74, 84, 94 Concave structures 341, 741 First curved surfaces 342, 742 Second curved surfaces 35, 75 Main bodies 351, 751 First 1 arc surface 352,752 2nd arc surface 353,753 upper part 354,754 plane 355,655 base part 95 screen 96 light source θ sandwich angle

Claims

An optical thin plate used for adjusting and controlling a light diffusion angle, the optical thin plate including a main body and a structural surface layer,
The main body includes a flat surface, a base portion, and an upper portion, and the flat surface, the base portion, and the upper portion intersect each other,
The structural surface layer has a plurality of concave structures facing each other adjacent to each other, the concave structures are installed on the plane, and each concave structure has at least two first curved surfaces facing each other and at least Two opposing second curved surfaces, wherein the first curved surface extends to the base portion, and the second curved surface extends to the base portion;
Among them, the first curved surface and the other first curved surface of the concave structure adjacent to each other are connected to each other at the upper portion to form a first arc surface, and the second curved surface and the other adjacent to each other. The second curved surface of the concave structure is an optical thin plate that is connected to each other at the upper portion to form a second arc surface.

2. The optical thin plate according to claim 1, wherein the upper part of each concave structure surrounds and forms a trapezoid, a rectangle, a rhombus or a square.

The optical thin plate according to claim 1, wherein the base portion has a dot shape, a planar shape, or an arc surface shape.

The optical thin plate further includes a main layer, the main layer is located below the structural surface layer, and a plurality of diffusion particles are distributed inside the main layer, and the refractive index of the light diffusion particles and the main layer 2. The optical thin plate according to claim 1, which has a different refractive index.

The optical thin plate according to claim 4, wherein the optical thin plate further includes a base layer, the base layer is located below the main layer, and the base layer includes an ultraviolet light absorber.

The optical thin plate according to claim 1, wherein the two first curved surfaces are symmetrical to each other with respect to the base portion.

The optical thin plate according to claim 1, wherein the two second curved surfaces are symmetrical with respect to the base portion.

An optical thin plate used for adjusting and controlling a light diffusion angle, the optical thin plate including a main body and a structural surface layer,
The body includes a plane and an upper part,
The structural surface layer includes a plurality of concave structures facing each other adjacent to each other, the concave structures are disposed on the plane, and each concave structure has a first curved surface and at least two mutually opposed first structures. The first curved surface extends downward and is adjacent to the second curved surface;
Among them, the first curved surface and the other first curved surface of the concave structure adjacent to each other are connected to each other at the upper portion to form a first arc surface, and the second curved surface and the other adjacent to each other. The second curved surface of the concave structure is an optical thin plate that is connected to each other at the upper portion to form a second arc surface.

9. The optical thin plate according to claim 8, wherein the upper part of each concave structure surrounds and forms a trapezoid, a rectangle, a diamond, or a square.

The optical thin plate further includes a main layer, the main layer is located below the structural surface layer, and a plurality of diffusion particles are distributed inside the main layer, and the refractive index of the light diffusion particles and the main layer The optical thin plate according to claim 8, which has a different refractive index.

The optical thin plate according to claim 10, wherein the base layer is located below the main layer, and the base layer includes an ultraviolet light absorber.

The optical thin plate according to claim 8, wherein the two second curved surfaces are symmetrical to each other with respect to the first curved surface.