JP6305070B2 - Video display device - Google Patents
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- JP6305070B2 JP6305070B2 JP2014005584A JP2014005584A JP6305070B2 JP 6305070 B2 JP6305070 B2 JP 6305070B2 JP 2014005584 A JP2014005584 A JP 2014005584A JP 2014005584 A JP2014005584 A JP 2014005584A JP 6305070 B2 JP6305070 B2 JP 6305070B2
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Description
本発明は、ＬＥＤ素子等を多数配列して形成する大型ディスプレイ等の映像表示装置に関するものである。 The present invention relates to a video display device such as a large display formed by arranging a large number of LED elements and the like.
従来の大型映像表示装置は、多数の表示ユニットをタイリングして構成されている。各表示ユニットは、表示面に表示素子であるＬＥＤ素子が配列されたＬＥＤ基板と、そのＬＥＤ素子を嵌合させる開口部を有するマスク部材を構成部材として備えている。ＬＥＤ基板には、ＬＥＤ素子に加えて駆動ＩＣ等が実装されており、駆動ＩＣに入力された制御データに基づいてＬＥＤ素子が駆動され、発光することで、画像データに基づいた映像がディスプレイに表示される。屋外で使用する場合、ＬＥＤ基板上に配置されたＬＥＤ素子の電極端子の防水コーティングが必要であり、ＬＥＤ素子の周囲は、シリコーンやエポキシなどの樹脂によりなる防水コート部材で充填される。
また、表示コントラストに関しては、マスク部材に、黒色の樹脂部材を適用することで、ディスプレイ全体の非表示時の黒輝度を下げ、コントラスト向上を行っている。
A conventional large-sized video display device is configured by tiling a large number of display units. Each display unit includes, as constituent members, an LED substrate on which LED elements as display elements are arranged on a display surface, and a mask member having an opening for fitting the LED elements. In addition to the LED element, a drive IC and the like are mounted on the LED substrate. The LED element is driven based on the control data input to the drive IC and emits light, whereby an image based on the image data is displayed on the display. Is displayed. When used outdoors, a waterproof coating is required on the electrode terminals of the LED elements arranged on the LED substrate, and the periphery of the LED elements is filled with a waterproof coating member made of a resin such as silicone or epoxy.
As for the display contrast, a black resin member is applied to the mask member to reduce the black luminance when the entire display is not displayed, thereby improving the contrast.
また、従来の発光表示装置に、マスク部材として大型の庇形状のルーバーを形成した例がある。その例では、マスク部材の開口部から入射する光を吸収し外光の乱反射を防止する反射防止シートを、ＬＥＤ取付部材の表面に配置する技術が開示されている（例えば、特許文献１参照）。 In addition, there is an example in which a large ridge-shaped louver is formed as a mask member in a conventional light emitting display device. In that example, a technique is disclosed in which an antireflection sheet that absorbs light incident from an opening of a mask member and prevents irregular reflection of external light is disposed on the surface of the LED mounting member (see, for example, Patent Document 1). .
従来の大型表示ディスプレイの表示ユニットにおいて、ＬＥＤ素子を防水するための防水コート部材には、材料として例えばシリコーンが用いられることを示したが、シリコーンの表面は艶状態である。そのため、シリコーンによる防水コート部材は、外光を反射しやすく、屋外環境では特に太陽光を反射し、画質の悪化に繋がる。また、シリコーンが外気に直接曝されることは、太陽光や風雨によりシリコーンの劣化の加速に繋がる。通常、屋外に設置する大型表示ディスプレイでは、この防水コート部材の表面反射を防ぐため、防水コート部材を覆うようにブラックマトリクスと呼ばれるマスク部材を用いる。マスク部材を防水コート部材の前面に設置することで、防水コート部材表面における外光反射を抑制する。その際、マスク部材内において、ＬＥＤ基板上のＬＥＤ素子が配置された位置に相当する部分には開口が設けられており、ＬＥＤ素子の発光を妨げない構造となっている。 In a display unit of a conventional large display, it has been shown that, for example, silicone is used as a material for a waterproof coat member for waterproofing an LED element, but the surface of the silicone is glossy. Therefore, the waterproof coating member made of silicone easily reflects external light, and reflects sunlight particularly in an outdoor environment, leading to deterioration of image quality. Moreover, direct exposure of silicone to the outside air leads to acceleration of deterioration of the silicone due to sunlight and wind and rain. Usually, in a large display installed outdoors, a mask member called a black matrix is used so as to cover the waterproof coat member in order to prevent surface reflection of the waterproof coat member. By installing the mask member on the front surface of the waterproof coat member, reflection of external light on the surface of the waterproof coat member is suppressed. At that time, in the mask member, an opening is provided in a portion corresponding to the position where the LED element on the LED substrate is disposed, and the light emission of the LED element is not hindered.
しかし、ＬＥＤ素子、防水コート部材、マスク部材の物理的な配置関係次第では、ＬＥＤ素子の発光の一部をマスク部材が遮る場合がある。特許文献１のような庇形状のルーバーがマスク部材である場合、ＬＥＤ基板上でのルーバーの高さが大きくなり、ＬＥＤ素子からの発光が遮られ、視野角が小さくなってしまう。これを回避するためには、庇形状のものよりも基板平面からの高さを抑制することができる平板状のマスク部材を用いるなどして厚みを薄くするか、もしくは開口を大きく広げる必要があるが、マスク部材は主に射出成型で製造されることが多く、一定の厚み以下にすることが難しい。また、開口を広げた場合、それに応じて防水コート部材の露出面積が広くなり、防水コート部材表面における外光反射による画質の劣化、防水コート部材への外光照射、風雨に直接曝されることによる防水コート部材の劣化加速が発生する。 However, depending on the physical arrangement relationship of the LED element, the waterproof coat member, and the mask member, the mask member may block a part of light emission of the LED element. In the case where a bowl-shaped louver as in Patent Document 1 is a mask member, the height of the louver on the LED substrate is increased, light emission from the LED element is blocked, and the viewing angle is decreased. In order to avoid this, it is necessary to reduce the thickness by using a flat mask member capable of suppressing the height from the substrate plane as compared with the bowl shape or to widen the opening. However, the mask member is often manufactured mainly by injection molding, and it is difficult to make the thickness below a certain value. In addition, when the opening is widened, the exposed area of the waterproof coat member is increased accordingly, the image quality is deteriorated due to reflection of external light on the surface of the waterproof coat member, the external light irradiation to the waterproof coat member, and direct exposure to wind and rain. Acceleration of deterioration of the waterproof coating member occurs due to.
この発明は、上記のような課題を解決するためになされたものであり、屋外環境下における防水コート部材の外光反射を抑制するために防水コート部材の前面にマスク部材を設置した時、発光素子からの発光を遮ることなく、マスク部材の開口において発生する防水コート部材表面の外光反射、防水コート部材の劣化の加速を防ぐことを目的とする。 The present invention has been made to solve the above problems, and emits light when a mask member is installed on the front surface of the waterproof coat member in order to suppress external light reflection of the waterproof coat member in an outdoor environment. An object of the present invention is to prevent external light reflection on the surface of the waterproof coating member generated at the opening of the mask member and acceleration of deterioration of the waterproof coating member without blocking light emission from the element.
この発明に係わる映像表示装置は、基板、上記基板上に実装された表示素子、上記基板上に、上記表示素子の電極部を埋設する厚さとなるように充填配置され、上記表示素子の上面を表出させた防水コート部材、上記防水コート部材の前面に配置され、上記表示素子の配置領域およびその外周部を除いて形成された略平板状のマスク部材、上記防水コート部材の前面に配置され、外光の反射を抑制する略平板状の反射防止部材を備え、上記基板上において、上記マスク部材の上面は上記表示素子の上面よりも高く突出して設けられるとともに、上記マスク部材は、上記表示素子の上面の発光部からの視野角θを確保するように、上記表示素子から離間して配設され、上記反射防止部材は、上記マスク部材と上記表示素子の隙間を覆うように設けられたものである。
An image display device according to the present invention is disposed so as to fill a substrate , a display element mounted on the substrate, a thickness for embedding an electrode portion of the display element on the substrate, and an upper surface of the display element. The exposed waterproof coat member, disposed on the front surface of the waterproof coat member, a substantially flat mask member formed excluding the display element placement region and the outer periphery thereof , and disposed on the front face of the waterproof coat member. A substantially flat antireflection member that suppresses reflection of external light, and the upper surface of the mask member is provided so as to protrude higher than the upper surface of the display element on the substrate. to ensure the viewing angle θ from the light emitting portion of the upper surface of the element, are disposed at a distance from the display device, the reflection preventing member is set so as to cover the gap of the mask member and the display device It was those.
この発明の映像表示装置によれば、平板状のマスク部材を配置することで問題となるマスク部材の開口部に入射する外光の反射を、マスク部材と表示素子の隙間に反射防止部材を配置することで抑制することが可能となる。 According to the video display device of the present invention, the reflection of the external light incident on the opening of the mask member, which becomes a problem by arranging the flat mask member, is arranged in the gap between the mask member and the display element. It becomes possible to suppress by doing.
実施の形態１．
以下、この発明の実施の形態１における映像表示装置について図１から図５を参照して説明する。図１は、この発明の実施の形態１の映像表示装置１００とそれを構成する表示ユニット１の取り付け状態を表す斜視図である。映像表示装置１００は、多数の表示ユニット１をタイリングすることで形成される。図２に表示ユニット１の要部拡大断面図を示す。表示ユニット１は、ＬＥＤ素子（表示素子）２が実装されたＬＥＤ基板（基板）３と、ＬＥＤ素子２の防水のためＬＥＤ素子２の周囲に充填される防水コート部材４と、その前面に配置され、外光の反射を抑制するブラックマトリクスと呼ばれる略平板状のマスク部材５と、マスク部材５と防水コート部材４の間に配置される、マスク部材５よりも厚みが薄い反射防止部材６から構成される。
Embodiment 1 FIG.
Hereinafter, a video display apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an attached state of a video display device 100 according to Embodiment 1 of the present invention and a display unit 1 constituting the same. The video display device 100 is formed by tiling a large number of display units 1. FIG. 2 shows an enlarged cross-sectional view of the main part of the display unit 1. The display unit 1 includes an LED substrate (substrate) 3 on which an LED element (display element) 2 is mounted, a waterproof coating member 4 filled around the LED element 2 for waterproofing the LED element 2, and a front surface thereof. And a substantially flat mask member 5 called a black matrix that suppresses reflection of external light, and an antireflection member 6 that is disposed between the mask member 5 and the waterproof coating member 4 and is thinner than the mask member 5. Composed.
マスク部材５は、ＬＥＤ基板３上に、ＬＥＤ素子２の形成領域を除いて形成され、反射防止部材６は、マスク部材５とＬＥＤ素子２の隙間ｂに配置され、この隙間ｂに入射する外光の反射を抑制している。なお、ＬＥＤ素子２の外側面に接するように反射防止部材６は、防水コート部材４の表面を覆う状態に形成される。
ここで、マスク部材５は、庇形状ではなく、平板状のものを用いることで、ＬＥＤ基板３の上に突出するマスク部材５の上面の高さを小さく抑制することができる。また、マスク部材５と防水コート部材４の層の間に配置する反射防止部材６の厚みを、平板状のマスク部材５よりも薄くすることで、マスク部材５の前面への突出量を小さく抑えられる構成としている。
The mask member 5 is formed on the LED substrate 3 except for the formation region of the LED element 2, and the antireflection member 6 is disposed in the gap b between the mask member 5 and the LED element 2, and is externally incident on the gap b. Light reflection is suppressed. The antireflection member 6 is formed so as to cover the surface of the waterproof coating member 4 so as to be in contact with the outer surface of the LED element 2.
Here, the height of the upper surface of the mask member 5 which protrudes on the LED board 3 can be suppressed small by using the mask member 5 not having a bowl shape but a flat plate shape. Further, by making the thickness of the antireflection member 6 disposed between the mask member 5 and the waterproof coat member 4 thinner than the flat mask member 5, the amount of protrusion of the mask member 5 to the front surface is kept small. It is assumed that it is configured.
このように構成された表示ユニット１において、防水コート部材４は、シリコーンやエポキシ樹脂など、液状のものをＬＥＤ素子２の周囲に塗布後に硬化させることで形成される。その表面は一般的には鏡面状態であり、外光が照射されたときに反射が発生する。この外光の反射は映像表示装置１００において、画質の悪化の原因になることから、これを抑制するため、防水コート部材４の前面にマスク部材５が配置されることが多い。マスク部材５には金属や樹脂が使用されるが、コスト、設計時の形状の自由度から、樹脂成型により製造されることが多い。またマスク部材５は、外光反射を極力抑えるために、その表面にシボ加工や艶消し塗装などが施されており、反射抑制構造を有している。 In the display unit 1 configured as described above, the waterproof coating member 4 is formed by applying a liquid material such as silicone or epoxy resin around the LED element 2 and then curing it. The surface is generally in a mirror state, and reflection occurs when external light is irradiated. The reflection of the external light causes deterioration of the image quality in the image display apparatus 100. Therefore, in order to suppress this, the mask member 5 is often disposed on the front surface of the waterproof coating member 4. Although metal and resin are used for the mask member 5, it is often manufactured by resin molding from the viewpoint of cost and freedom of shape at the time of design. In addition, the mask member 5 has a surface that is subjected to texture processing, matte coating, or the like in order to suppress external light reflection as much as possible, and has a reflection suppressing structure.
この時、防水コート部材４はＬＥＤ素子電極２１を埋設しなければならず、防水コート部材４の厚みｔ２はＬＥＤ素子電極２１の高さｔ１より大きくなる。なお、図２に例示したＬＥＤ素子２は、図３（ａ）に示すような面実装ＬＥＤと呼ばれるパッケージ形状であったが、その他、図３（ｂ）に示すような砲弾型ＬＥＤ２ｂと呼ばれるパッケージ形状もある。ＬＥＤ素子２が面実装ＬＥＤである場合、ＬＥＤ素子電極２１の高さｔ１は、一般的に０〜２．０ｍｍであり、それを覆う防水コート部材４の厚みｔ２は０．１〜２．５ｍｍ程度である。一方、砲弾型ＬＥＤ２ｂの場合、ＬＥＤ素子電極２１ｂの高さｔ１は、３ｍｍ〜７ｍｍ程度であり、それを覆う防水コート部材４の厚みｔ２は３．５ｍｍ〜１０ｍｍ程度となる。 At this time, the waterproof coat member 4 must embed the LED element electrode 21, and the thickness t <b> 2 of the waterproof coat member 4 is larger than the height t <b> 1 of the LED element electrode 21. The LED element 2 illustrated in FIG. 2 has a package shape called a surface-mounted LED as shown in FIG. 3A, but in addition, a package called a bullet-type LED 2b as shown in FIG. 3B. There is also a shape. When the LED element 2 is a surface mount LED, the height t1 of the LED element electrode 21 is generally 0 to 2.0 mm, and the thickness t2 of the waterproof coating member 4 covering the LED element electrode 21 is 0.1 to 2.5 mm. Degree. On the other hand, in the case of the bullet-type LED 2b, the height t1 of the LED element electrode 21b is about 3 mm to 7 mm, and the thickness t2 of the waterproof coating member 4 covering the LED element electrode 21b is about 3.5 mm to 10 mm.
マスク部材５は、防水コート部材４の前面に配置されるが、特に面実装ＬＥＤをＬＥＤ素子２として使用する場合、配置条件によってはＬＥＤ素子２の発光を遮断することがある。図４に、本発明の映像表示装置１００との比較のために、防水コート部材４の表面全面にマスク部材５０を形成した場合の表示ユニットの要部拡大断面図を示し、さらに、発光部２２からの発光の様子を示す部分拡大断面図を示す。図４のマスク部材５０は、ＬＥＤ素子２の形成領域を除く、防水コート部材４の形成領域上に形成される。マスク部材５０上面の高さがＬＥＤ素子２の発光部２２表面よりも高い位置にあることから、ＬＥＤ素子２の斜め方向の発光（視野角θ＝７０度）が、マスク部材５０の側面によって遮断された状態となる。
防水コート部材４の外光反射を抑えるために、その前面（上面）にマスク部材５が配置されているが、ＬＥＤ素子２から斜め方向に出ていく光はマスク部材５の側面に当たるため遮られる。通常、大型映像表示装置において、製品の視野角θとして７０度が求められる場合が多く、これを実現するためにはＬＥＤ素子２から出ていく光のうち、正面方向への発光に対し、斜め７０度となる方向に出ていく光を遮断しないようにしなければならない。
Although the mask member 5 is disposed on the front surface of the waterproof coating member 4, particularly when a surface-mounted LED is used as the LED element 2, the light emission of the LED element 2 may be blocked depending on the arrangement conditions. For comparison with the video display device 100 of the present invention, FIG. 4 shows an enlarged cross-sectional view of the main part of the display unit when the mask member 50 is formed on the entire surface of the waterproof coat member 4, and the light emitting unit 22. The partial expanded sectional view which shows the mode of light emission from is shown. The mask member 50 of FIG. 4 is formed on the formation region of the waterproof coat member 4 excluding the formation region of the LED element 2. Since the height of the upper surface of the mask member 50 is higher than the surface of the light emitting portion 22 of the LED element 2, light emission in the oblique direction (viewing angle θ = 70 degrees) of the LED element 2 is blocked by the side surface of the mask member 50. It will be in the state.
A mask member 5 is disposed on the front surface (upper surface) of the waterproof coat member 4 to suppress reflection of external light. However, light exiting the LED element 2 in an oblique direction strikes the side surface of the mask member 5 and is blocked. . Usually, in a large-sized image display device, a viewing angle θ of a product is often required to be 70 degrees, and in order to achieve this, the light emitted from the LED element 2 is oblique with respect to the emission in the front direction. It is necessary not to block light exiting in the direction of 70 degrees.
視野角として７０度を確保する場合の映像表示装置１００の構成例として、図５の表示ユニット１の要部拡大断面図の構成例が挙げられる。図５は、本発明の説明に必要な表示ユニットの構造例を示しており、本発明の要素である反射防止部材６を含まない例である。この図５に示すように、マスク部材５の厚みをｔ３とした場合、ＬＥＤ素子２から斜め７０度方向に出ていく光を遮断しないようにするためには、ＬＥＤ素子２表面の発光部２２の端部から、距離ａを隔てた位置に、マスク部材５の端面を配置する必要がある。この時、距離ａは以下式（１）により表される。 As an example of the configuration of the video display device 100 in the case of securing 70 degrees as the viewing angle, an example of the configuration of an enlarged cross-sectional view of the main part of the display unit 1 of FIG. FIG. 5 shows an example of the structure of a display unit necessary for explaining the present invention, and is an example not including the antireflection member 6 which is an element of the present invention. As shown in FIG. 5, when the thickness of the mask member 5 is t3, the light emitting portion 22 on the surface of the LED element 2 is used in order not to block the light exiting from the LED element 2 in the direction of 70 degrees obliquely. It is necessary to arrange the end face of the mask member 5 at a position separated from the end of the distance a. At this time, the distance a is represented by the following formula (1).
距離ａが大きくなることは、防水コート部材４の露出面積の増加を意味し、防水コート部材４の表面における外光反射の増加につながる。これを防ぐためには距離ａを小さくする必要があり、そのための方法としてマスク部材５の厚みｔ３の減少、防水コート部材４の厚みｔ２の減少、ＬＥＤ素子２の高さｔ４の増加が挙げられる。平板状のマスク部材５の厚みｔ３の減少については、実施が難しい。マスク部材５が通常、射出成型で作られる場合が多く、その厚みｔ３は成型性、強度の確保の点から、薄くすることが難しいためである。また、防水コート部材４の厚みｔ２の減少は、ＬＥＤ素子電極２１までのクリアランスの減少を意味し、信頼性の低下につながる。ＬＥＤ素子２の高さｔ４の増加はＬＥＤ素子２の材料コストの増加となる。図５において、マスク部材５の厚みｔ３を１ｍｍ、防水コート部材４の厚みｔ２を２ｍｍ、ＬＥＤ素子２の高さｔ４を２．５ｍｍと仮定した場合、距離ａは約１．４ｍｍとなる。 Increasing the distance a means an increase in the exposed area of the waterproof coat member 4 and leads to an increase in reflection of external light on the surface of the waterproof coat member 4. In order to prevent this, it is necessary to reduce the distance a, and as a method therefor, there are a reduction in the thickness t3 of the mask member 5, a reduction in the thickness t2 of the waterproof coating member 4, and an increase in the height t4 of the LED element 2. The reduction of the thickness t3 of the flat mask member 5 is difficult to implement. This is because the mask member 5 is usually made by injection molding, and its thickness t3 is difficult to reduce from the viewpoint of securing moldability and strength. Moreover, the decrease in the thickness t2 of the waterproof coat member 4 means a decrease in the clearance to the LED element electrode 21, leading to a decrease in reliability. The increase in the height t4 of the LED element 2 increases the material cost of the LED element 2. In FIG. 5, assuming that the thickness t3 of the mask member 5 is 1 mm, the thickness t2 of the waterproof coating member 4 is 2 mm, and the height t4 of the LED element 2 is 2.5 mm, the distance a is about 1.4 mm.
一方、実施の形態１の断面拡大図である図２において、ＬＥＤ素子２表面（上面）の発光部２２の端面とマスク部材５の端面間の距離ａ、マスク部材５の厚みｔ３、防水コート部材４の厚みｔ２、ＬＥＤ素子２の高さｔ４の関係は、薄型の反射防止部材６の厚みｔ５を用いて以下式（２）で表される。ここで、図２に示したように、距離ａは、ＬＥＤ素子２の端部からマスク部材５までの基板平面方向の隙間（距離）ｂと、ＬＥＤ素子２の端部から、ＬＥＤ素子２の発光部２２の端部までの距離ｃの和に相当する。 On the other hand, in FIG. 2, which is an enlarged cross-sectional view of the first embodiment, the distance a between the end surface of the light emitting portion 22 on the surface (upper surface) of the LED element 2 and the end surface of the mask member 5, the thickness t3 of the mask member 5, the waterproof coating member The relationship between the thickness t2 of 4 and the height t4 of the LED element 2 is expressed by the following formula (2) using the thickness t5 of the thin antireflection member 6. Here, as shown in FIG. 2, the distance a is determined from the gap (distance) b in the substrate plane direction from the end of the LED element 2 to the mask member 5 and the end of the LED element 2. This corresponds to the sum of the distance c to the end of the light emitting unit 22.
薄型の反射防止部材６はフィルムや、金属板を用いて形成することが可能である。また、反射防止部材６の別の形成方法として、防水コート部材４の表面に、塗装を行うことで形成する方法もある。反射防止部材６の表面は外光の反射を抑制するためのシボ加工や艶消し塗装などの反射抑制処理が施されていることが好ましい。また、外気に直接曝されるため、耐候性を有していることが好ましい。反射防止部材６の厚みｔ５を０．１ｍｍとすると、距離ａは約１．６ｍｍとなり、距離ａを１．６ｍｍ以上にすることで、反射防止部材６およびマスク部材５をＬＥＤ素子２の発光を遮らない位置に配置でき、ＬＥＤ素子２表面から斜め７０度（角度θ）に出ていく光の確保が可能となる。この時、防水コート部材４は反射防止部材６で覆われており、図２に示した隙間ｂの領域において、防水コート部材４の露出を限りなく小さくすることが可能である。 The thin antireflection member 6 can be formed using a film or a metal plate. Another method for forming the antireflection member 6 is to form the surface of the waterproof coating member 4 by painting. The surface of the antireflection member 6 is preferably subjected to antireflection treatment such as embossing or matting to suppress reflection of external light. Moreover, since it is directly exposed to external air, it is preferable to have weather resistance. When the thickness t5 of the antireflection member 6 is 0.1 mm, the distance a is about 1.6 mm. By setting the distance a to 1.6 mm or more, the antireflection member 6 and the mask member 5 emit light from the LED element 2. It can be arranged at a position where it is not blocked, and it is possible to secure light that is emitted at an angle of 70 degrees (angle θ) from the surface of the LED element 2. At this time, the waterproof coat member 4 is covered with the antireflection member 6, and the exposure of the waterproof coat member 4 can be made as small as possible in the region of the gap b shown in FIG.
ただし、ＬＥＤ素子２表面の発光部２２は、ＬＥＤ素子２内に含まれる拡散剤の影響などで、ある程度広範囲になることから、ＬＥＤ素子２の端部から発光部２２の端部までの距離ｃにはバラつきがある。そのため、発光部２２の端部からマスク部材５までの距離ａについても、ある程度のバラつきが生じる。 However, since the light emitting portion 22 on the surface of the LED element 2 becomes somewhat wide due to the influence of the diffusing agent contained in the LED element 2, the distance c from the end of the LED element 2 to the end of the light emitting portion 22 is c. There are variations. For this reason, the distance a from the end of the light emitting portion 22 to the mask member 5 also varies to some extent.
以上、説明したように、平板状のマスク部材５と防水コート部材４の間に、防水コート部材４の表面を覆うように反射防止部材６を配置することで、マスク部材５の開口部における防水コート部材４の露出を防ぐことができ、外光反射を抑制することができる。さらに、反射防止部材６を、平板状のマスク部材５よりも薄い薄型部材とすることで、マスク部材５上面の高さを小さく抑制でき、ＬＥＤ素子２の発光を遮断することなく、視野角θを確保することが可能となる。ここで、同じ視野角θを確保する場合、発光部２２からマスク部材５上面までの高さが小さい程、マスク開口寸法を小さくでき、図２で示した隙間ｂを小さくできることは言うまでもない。
これにより、屋外環境において、防水コート部材４の表面における外光反射を抑制できるとともに、防水コート部材４が外光や風雨に直接曝されることを防ぐことができ、防水コート部材４の劣化の加速を抑制することが可能となる。
As described above, the antireflection member 6 is disposed between the flat mask member 5 and the waterproof coat member 4 so as to cover the surface of the waterproof coat member 4, thereby waterproofing the opening of the mask member 5. The coating member 4 can be prevented from being exposed and external light reflection can be suppressed. Further, by making the antireflection member 6 a thin member thinner than the flat mask member 5, the height of the upper surface of the mask member 5 can be reduced, and the viewing angle θ without blocking the light emission of the LED element 2. Can be secured. Here, when the same viewing angle θ is secured, it goes without saying that the smaller the height from the light emitting portion 22 to the upper surface of the mask member 5, the smaller the mask opening dimension and the smaller the gap b shown in FIG.
Thereby, while being able to suppress external light reflection on the surface of the waterproof coat member 4 in an outdoor environment, it is possible to prevent the waterproof coat member 4 from being directly exposed to external light or wind and rain. It becomes possible to suppress acceleration.
実施の形態２．
図６は、この発明の実施の形態２による映像表示装置１００の表示ユニット１の要部拡大断面図を示すものであり、マスク部材５の開口部における防水コート部材４の露出を、ＬＥＤ素子２の前面に配置した反射防止部材６ａによって防ぐ構造を示している。図６に示すように、平板状の反射防止部材６ａは、ＬＥＤ素子２の上面外周部に接するように配置され、発光部２２上には、この反射防止部材６ａは配置されない。反射防止部材６ａはＬＥＤ素子２の発光部２２と重なる部分は開口部となっており、ＬＥＤ素子２上面の発光部２２を除いた外周部を反射防止部材６ａが覆う状態となっている。なお、図６では、防水コート部材４と反射防止部材６ａの層の間に空隙が有る構造例が示されている。
上述の実施の形態１で述べた防水コート部材４の表面における外光反射の抑制に加えて、この実施の形態２の反射防止部材６ａを用いることで、ＬＥＤ素子２表面における外光反射の一部を抑制することが可能である。この時、反射防止部材６ａの厚みｔ５に応じて、ＬＥＤ素子２表面の発光部２２と、反射防止部材６ａの端面間の距離ｄを設定することで、ＬＥＤ素子２上面外周部における外光反射の抑制と、視野角θの確保を両立することができる。例として、視野角７０°を確保するためのＬＥＤ素子２表面の発光部２２と反射防止部材６ａの端面間の距離ｄは、以下式（３）で表される。
Embodiment 2. FIG.
FIG. 6 is an enlarged cross-sectional view of the main part of the display unit 1 of the video display device 100 according to Embodiment 2 of the present invention. The exposure of the waterproof coat member 4 at the opening of the mask member 5 is indicated by the LED element 2. The structure prevented by the antireflection member 6a arrange | positioned in the front surface of is shown. As shown in FIG. 6, the flat antireflection member 6 a is disposed in contact with the outer peripheral portion of the upper surface of the LED element 2, and the antireflection member 6 a is not disposed on the light emitting unit 22. The portion of the antireflection member 6 a that overlaps the light emitting portion 22 of the LED element 2 is an opening, and the antireflection member 6 a covers the outer peripheral portion of the upper surface of the LED element 2 excluding the light emitting portion 22. In addition, in FIG. 6, the structural example with a space | gap between the layer of the waterproof coating member 4 and the reflection preventing member 6a is shown.
In addition to the suppression of external light reflection on the surface of the waterproof coating member 4 described in the first embodiment, the use of the antireflection member 6a of the second embodiment allows one of the reflections of the external light on the surface of the LED element 2 to be performed. It is possible to suppress the part. At this time, by setting the distance d between the light emitting portion 22 on the surface of the LED element 2 and the end face of the antireflection member 6a according to the thickness t5 of the antireflection member 6a, external light reflection at the outer peripheral portion of the upper surface of the LED element 2 And the securing of the viewing angle θ can both be achieved. As an example, the distance d between the light emitting portion 22 on the surface of the LED element 2 and the end face of the antireflection member 6a for ensuring a viewing angle of 70 ° is expressed by the following formula (3).
反射防止部材６ａの厚みｔ５を０．１ｍｍとした場合、ｄは約０．３ｍｍとなる。ただしＬＥＤ素子２表面の発光部２２は、ＬＥＤ素子２内に含まれる拡散剤の影響などで、ある程度広範囲になることから、反射防止部材６ａの端面との距離ｄは、ある程度バラついても良い。
反射防止部材６ａを、薄型のフィルムや金属板で形成する場合、反射防止部材６ａの剛性が低くなることから、支持点数（支持領域）が少ない状態で、フラットに配置することが難しい。図６のように、反射防止部材６ａをＬＥＤ素子２上面外周部に接するように積層することで、ＬＥＤ基板３上に多数配置されたＬＥＤ素子２がスペーサーの役割を果たし、反射防止部材６ａをフラットな形状で配置することが可能となる。
When the thickness t5 of the antireflection member 6a is 0.1 mm, d is about 0.3 mm. However, since the light emitting portion 22 on the surface of the LED element 2 becomes wide to some extent due to the influence of the diffusing agent contained in the LED element 2, the distance d from the end surface of the antireflection member 6a may vary to some extent.
When the antireflection member 6a is formed of a thin film or metal plate, the rigidity of the antireflection member 6a is lowered, and thus it is difficult to arrange the antireflection member 6a in a flat state with a small number of support points (support regions). As shown in FIG. 6, the antireflection member 6 a is laminated so as to be in contact with the outer peripheral portion of the upper surface of the LED element 2, so that a large number of LED elements 2 arranged on the LED substrate 3 serve as spacers, and the antireflection member 6 a It can be arranged in a flat shape.
また、ＬＥＤ素子２の形状は、図７の表示ユニット１の要部拡大断面図に示すように、面実装ＬＥＤの表面の一部（発光部２２に相当する部分）が突出して凸形状部２ｃを構成するものがある。この場合、ＬＥＤ素子２の高さｔ４は、図６等で示したＬＥＤ素子２と同様に、ＬＥＤ素子２の上部平面までの高さとして考えることができる。 Further, as shown in the enlarged cross-sectional view of the main part of the display unit 1 in FIG. 7, the shape of the LED element 2 is such that a part of the surface of the surface-mounted LED (part corresponding to the light emitting part 22) protrudes and is a convex part 2c. There is what constitutes. In this case, the height t4 of the LED element 2 can be considered as the height to the upper plane of the LED element 2 as in the LED element 2 shown in FIG.
実施の形態３．
図８は、この発明の実施の形態３による映像表示装置１００の表示ユニット１の要部拡大断面図を示すものである。この実施の形態３の表示ユニット１では、反射防止部材６ｂが、ＬＥＤ素子２表面を覆うとともに、ＬＥＤ基板３上のＬＥＤ素子２が配列された表示領域を覆う状態に配置形成されている。さらに、反射防止部材６ｂは、ＬＥＤ素子２からの発光を遮断しないように、少なくとも一部が光を透過するように構成されたことを特徴とする。例えば、反射防止部材６ｂの全面もしくはＬＥＤ素子２の上面について、透明もしくは半透明な材料を用いることで形成しても良いし、多数の細かい光透過孔を設け、一定の開口率を持たせたメッシュ状とし、光を透過させても良い。反射防止部材６ｂに設ける光透過孔の開口率（２５％）は、例えば開口寸法０．５ｍｍ角の孔を、ピッチ１．０ｍｍで格子状に配置することで実現が可能である。また、ＡＲフィルムのように、外光の反射抑制と、ＬＥＤ素子２の発光を両立する材料を使用しても良い。
この構成により、ＬＥＤ素子２が配列された全表示領域での外光反射を抑制することができ、かつ反射防止部材６ｂがＬＥＤ素子２の発光を透過するため、映像表示装置１００の視野角の確保が可能である。
Embodiment 3 FIG.
FIG. 8 shows an enlarged cross-sectional view of the main part of the display unit 1 of the video display device 100 according to Embodiment 3 of the present invention. In the display unit 1 of the third embodiment, the antireflection member 6b is arranged and formed so as to cover the surface of the LED element 2 and the display area where the LED elements 2 on the LED substrate 3 are arranged. Further, the antireflection member 6b is characterized in that at least a part thereof is configured to transmit light so as not to block light emission from the LED element 2. For example, the entire surface of the antireflection member 6b or the upper surface of the LED element 2 may be formed by using a transparent or translucent material, or a large number of fine light transmission holes are provided to have a certain aperture ratio. A mesh shape may be used to transmit light. The aperture ratio (25%) of the light transmission holes provided in the antireflection member 6b can be realized, for example, by arranging holes with an opening size of 0.5 mm square in a lattice shape with a pitch of 1.0 mm. Moreover, you may use the material which makes the reflection suppression of external light and light emission of the LED element 2 compatible like an AR film.
With this configuration, it is possible to suppress external light reflection in the entire display region in which the LED elements 2 are arranged, and the antireflection member 6b transmits the light emitted from the LED elements 2, so that the viewing angle of the video display device 100 can be reduced. It can be secured.
実施の形態４．
図９は、この発明の実施の形態４による映像表示装置１００の表示ユニット１の要部拡大断面図を示すものである。上述の実施の形態１から３では、防水コート部材４上またはＬＥＤ素子２上に、反射防止部材６、６ａ、６ｂを固定した例を示したが、この実施の形態４では、図９に示すように、マスク部材５に反射防止部材６ｃが固定された構造となっている。そのため、マスク部材５をＬＥＤ基板３上に配置することで、反射防止部材６ｃを自動的にＬＥＤ基板３上に位置決めすることが可能となる。なお、マスク部材５は、図９に示さない領域においてＬＥＤ基板３上に固定される。また、図９では、反射防止部材６ｃが、マスク部材５の裏面側に固定された例を示したが、マスク部材５の上面以外に固定することもできる。
また、図９では、反射防止部材６ｃはＬＥＤ素子２の上面（表面）には接しない状態を示しているが、上述の実施の形態２で示したように、ＬＥＤ素子２の表面に接するように反射防止部材６ｃを配設することも可能であることは言うまでもない。
Embodiment 4 FIG.
FIG. 9 shows an enlarged cross-sectional view of the main part of the display unit 1 of the video display device 100 according to Embodiment 4 of the present invention. In the above-described first to third embodiments, the example in which the antireflection members 6, 6 a, 6 b are fixed on the waterproof coat member 4 or the LED element 2 has been shown, but in this fourth embodiment, it is shown in FIG. 9. As described above, the antireflection member 6 c is fixed to the mask member 5. Therefore, by disposing the mask member 5 on the LED substrate 3, the antireflection member 6c can be automatically positioned on the LED substrate 3. The mask member 5 is fixed on the LED substrate 3 in a region not shown in FIG. 9 shows an example in which the antireflection member 6c is fixed to the back surface side of the mask member 5. However, the antireflection member 6c may be fixed to other than the upper surface of the mask member 5.
9 shows a state in which the antireflection member 6c is not in contact with the upper surface (surface) of the LED element 2, but it is in contact with the surface of the LED element 2 as described in the second embodiment. Needless to say, the antireflection member 6c may be disposed on the surface.
なお、本発明は、その発明の範囲内において、各実施の形態を自由に組み合わせたり、各実施の形態を適宜、変形、省略することが可能である。 It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.
１ 表示ユニット、２ ＬＥＤ素子、２ｂ 砲弾型ＬＥＤ、２ｃ 凸形状部、３ ＬＥＤ基板、４ 防水コート部材、５、５０ マスク部材、６、６ａ、６ｂ、６ｃ 反射防止部材、２１、２１ｂ ＬＥＤ素子電極、２２ 発光部、１００ 映像表示装置。 DESCRIPTION OF SYMBOLS 1 Display unit, 2 LED element, 2b Cannonball type LED, 2c Convex-shaped part, 3 LED board, 4 Waterproof coat member, 5, 50 Mask member, 6, 6a, 6b, 6c Antireflection member, 21, 21b LED element electrode , 22 Light emitting unit, 100 video display device.
Claims (9)
上記基板上において、上記マスク部材の上面は上記表示素子の上面よりも高く突出して設けられるとともに、上記マスク部材は、上記表示素子の上面の発光部からの視野角θを確保するように、上記表示素子から離間して配設され、
上記反射防止部材は、上記マスク部材と上記表示素子の隙間を覆うように設けられたことを特徴とする映像表示装置。 Substrate, a display element mounted on the substrate, on the substrate, is filled arranged so as to have a thickness to bury the electrodes of the display element, the waterproof coating member was expose the upper surface of the display device, the A substantially flat mask member disposed on the front surface of the waterproof coat member and formed excluding the area where the display element is disposed and the outer periphery thereof, and is disposed on the front surface of the waterproof coat member to substantially suppress reflection of external light. It has a flat antireflection member,
On the substrate, the upper surface of the mask member protrudes higher than the upper surface of the display element, and the mask member secures a viewing angle θ from the light emitting portion on the upper surface of the display element. Arranged away from the display element,
The image display apparatus, wherein the antireflection member is provided so as to cover a gap between the mask member and the display element.
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| JP2001056647A (en) * | 1999-06-09 | 2001-02-27 | Sony Corp | Light emitting display device |
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