JPH07283438A - LED display - Google Patents
LED displayInfo
- Publication number
- JPH07283438A JPH07283438A JP6983694A JP6983694A JPH07283438A JP H07283438 A JPH07283438 A JP H07283438A JP 6983694 A JP6983694 A JP 6983694A JP 6983694 A JP6983694 A JP 6983694A JP H07283438 A JPH07283438 A JP H07283438A
- Authority
- JP
- Japan
- Prior art keywords
- led
- chip
- height
- led chip
- display
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
Landscapes
- Led Device Packages (AREA)
- Led Devices (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
(57)【要約】
【目的】 発光波長の異なるＬＥＤチップをセラミック
基板上に複数載置して一画素を形成するＬＥＤディスプ
レイにおいて、ＬＥＤチップの短波長の発光が吸収され
るのを少なくしてＬＥＤディスプレイの光度を向上さ
せ、特に赤色、緑色、青色ＬＥＤチップと三原色揃った
ＬＥＤディスプレイの青色ＬＥＤの外部量子効率を改良
してディスプレイの光度を向上させる。
【構成】 導電体層２が形成されたグリーンシート１が
積層されてなるセラミック基板上に複数のＬＥＤチップ
が載置され、ＬＥＤチップは短波長のＬＥＤチップの発
光部の高さが、長波長のＬＥＤチップの発光部の高さよ
りも高くなるように載置されており、さらにそのＬＥＤ
チップの高さがグリーンシート１の高さにより調整され
たＬＥＤディスプレイ。
(57) [Abstract] [Purpose] In an LED display in which a plurality of LED chips having different emission wavelengths are mounted on a ceramic substrate to form one pixel, it is possible to reduce absorption of short-wavelength light emitted from the LED chips. The luminous intensity of an LED display is improved, and in particular, the external quantum efficiency of a blue LED of an LED display having red, green, and blue LED chips and three primary colors aligned is improved to improve the luminous intensity of the display. [Structure] A plurality of LED chips are mounted on a ceramic substrate formed by stacking green sheets 1 having a conductor layer 2 formed thereon. It is mounted so that it is higher than the height of the light emitting part of the LED chip of
An LED display in which the height of the chip is adjusted by the height of the green sheet 1.
Description
【０００１】[0001]
【産業上の利用分野】本発明はグリーンシートが積層さ
れてなるセラミック基板上に、発光色の異なるＬＥＤ
（発光ダイオード）チップが載置されてなるＬＥＤディ
スプレイに係り、特に青色、緑色、および赤色の３原色
のＬＥＤで一画素が形成されたフルカラーＬＥＤディス
プレイに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED having different emission colors on a ceramic substrate formed by laminating green sheets.
The present invention relates to an LED display on which a (light emitting diode) chip is mounted, and particularly to a full-color LED display in which one pixel is formed of LEDs of three primary colors of blue, green, and red.
【０００２】[0002]
【従来の技術】看板、広告塔等の平面型ディスプレイに
はＬＥＤが使用されている。ＬＥＤディスプレイには大
別して、樹脂モールドしたＬＥＤを平面上に並べたもの
と、ＬＥＤチップを基板上に載置して電極を接続し、そ
の上から樹脂モールドしたものとが知られている。その
中でも後者のＬＥＤディスプレイは一画素を小さく構成
でき、解像度の高い画面が実現できるので将来を嘱望さ
れている。2. Description of the Related Art LEDs are used in flat displays such as signboards and advertising towers. LED displays are roughly classified into those in which resin-molded LEDs are arranged on a plane, and those in which an LED chip is placed on a substrate and electrodes are connected to each other and then resin-molded. Among them, the latter LED display can be constructed in a small size of one pixel and can realize a high resolution screen, so that it is expected in the future.
【０００３】後者のＬＥＤディスプレイにおいて、ＬＥ
Ｄチップが載置されるセラミック基板は、導電体層が表
面に形成されたグリーンシートが積層されてなってい
る。グリーンシートとは、例えばアルミナ、窒化アル
ミ、炭化ケイ素等の絶縁性材料が数十μｍ〜数百μｍの
厚さでシート状にされたものであり、そのグリーンシー
ト表面には数μｍ〜十数μｍの厚さでＷ、Ｍｏ、Ａｇペ
ースト等の導電性材料が導電体層としてパターン形成さ
れている。ＬＥＤチップはこのグリーンシートの最表面
の導電体層に電気的に接続され、配線パターンはグリー
ンシートが積層されて各層間の導電体層で形成され、デ
ィスプレイはこれらを組み合わせて文字表示、マルチカ
ラー等を実現している。In the latter LED display, LE
The ceramic substrate on which the D chip is mounted is formed by stacking green sheets having a conductor layer formed on the surface thereof. The green sheet is, for example, an insulating material such as alumina, aluminum nitride, or silicon carbide formed into a sheet with a thickness of several tens μm to several hundreds μm, and the surface of the green sheet has several μm to several tens of μm. A conductive material such as W, Mo, or Ag paste is patterned as a conductor layer with a thickness of μm. The LED chip is electrically connected to the outermost conductor layer of the green sheet, and the wiring pattern is formed by stacking the green sheets to form the conductor layers between the layers. The display is a combination of these for displaying characters and multi-color. And so on.
【０００４】図３に従来のＬＥＤディスプレイの一画素
の構造を表す模式断面図を示す。１１はグリーンシー
ト、２が導電体層であり、表面に導電体層２の形成され
たグリーンシート１１ａ、１１ｂを積層したセラミック
基板の同一面上に赤色ＬＥＤチップ（Ｒ）と緑色ＬＥＤ
チップ（Ｇ）とを載置して一画素を構成した構造として
いる。赤色チップＲ、緑色ＬＥＤチップＧには例えばＧ
ａＡｓ、ＧａＰ、ＧａＡｌＡｓ、ＧａＡｓＰ等の半導体
材料が使用されている。グリーンシート１１にはコント
ラストを上げるために例えば酸化クロム、チタニア等の
着色剤が添加されることが多い。なお３はキャビティー
を構成するためのカバー部材であり、例えば樹脂、積層
したグリーンシート等が使用されている。FIG. 3 is a schematic sectional view showing the structure of one pixel of a conventional LED display. Reference numeral 11 is a green sheet, 2 is a conductor layer, and a red LED chip (R) and a green LED are provided on the same surface of a ceramic substrate on which green sheets 11a and 11b on which the conductor layer 2 is formed are laminated.
The chip (G) is placed to form one pixel. For the red chip R and the green LED chip G, for example, G
Semiconductor materials such as aAs, GaP, GaAlAs and GaAsP are used. A coloring agent such as chromium oxide or titania is often added to the green sheet 11 in order to increase the contrast. Reference numeral 3 is a cover member for forming the cavity, and is made of resin, laminated green sheets, or the like.
【０００５】[0005]
【発明が解決しようとする課題】図３に示すように、同
一面上に異なる材料からなるＬＥＤチップを載置した場
合、材料のバンドギャップエネルギーの違いにより、短
波長のＬＥＤチップの発光の一部が長波長のＬＥＤチッ
プに吸収され、短波長ＬＥＤの外部量子効率が低下する
という問題がある。例えばＧａＰ系の材料よりなる緑色
ＬＥＤの発光はＧａＡｓ系の材料よりなる赤色ＬＥＤに
吸収される。As shown in FIG. 3, when LED chips made of different materials are mounted on the same surface, the difference in bandgap energy between the materials causes a short emission of light from the LED chips having a short wavelength. There is a problem that the external quantum efficiency of the short-wavelength LED is reduced because the part is absorbed by the long-wavelength LED chip. For example, the emission of a green LED made of a GaP-based material is absorbed by a red LED made of a GaAs-based material.
【０００６】ところで、従来のＬＥＤディスプレイは青
色ＬＥＤがなかったため、図３に示すように赤色ＬＥＤ
と緑色ＬＥＤよりなるマルチカラーのディスプレイであ
ったが、昨年１１月下旬、本出願人は赤色ＬＥＤの光度
に匹敵する光度１ｃｄ以上の青色ＬＥＤを発表し、ディ
スプレイのフルカラー化が可能となってきた。その青色
ＬＥＤは窒化ガリウム系化合物半導体（ＩｎXＡｌYＧａ
1-X-YＮ、０≦X≦１、０≦Y≦１、X＝Y≠１）よりな
り、およそ４５０ｎｍ〜４８０ｎｍに発光ピークを有す
る。By the way, since the conventional LED display does not have a blue LED, as shown in FIG.
It was a multi-color display consisting of a green LED and a green LED, but in late November last year, the applicant announced a blue LED with a luminous intensity of 1 cd or more, which is comparable to that of a red LED, and it has become possible to make the display full color. . The blue LED is a gallium nitride-based compound semiconductor (In X Al Y Ga
1-XY N, 0 ≦ X ≦ 1, 0 ≦ Y ≦ 1, X = Y ≠ 1, and has an emission peak at about 450 nm to 480 nm.
【０００７】青色ＬＥＤチップを加え、フルカラーＬＥ
Ｄディスプレイを実現した場合、前記のように同一面上
に３色のＬＥＤチップを並べると、青色ＬＥＤチップの
発光の一部が他の発光色のＬＥＤ材料に吸収されてしま
う。例えば窒化ガリウム系化合物半導体よりなる青色Ｌ
ＥＤチップの発光はそのバンドギャップエネルギーの違
いからＧａＰ系の緑色ＬＥＤ、ＧａＡｓ系の赤色ＬＥＤ
両材料に吸収される。緑色ＬＥＤの波長は視感度がよい
ため、発光が一部赤色ＬＥＤに吸収されてもほとんど目
には感じないが特に５００ｎｍ以下の青色ＬＥＤの波長
は視感度が悪いので、できるだけ吸収を避けた方が好ま
しい。Full color LE by adding blue LED chip
When the D display is realized, if the LED chips of three colors are arranged on the same surface as described above, a part of the light emission of the blue LED chip is absorbed by the LED materials of other emission colors. For example, blue L made of gallium nitride compound semiconductor
The light emission of the ED chip is GaP green LED and GaAs red LED due to the difference in bandgap energy.
It is absorbed by both materials. Since the wavelength of the green LED has good luminosity, even if some of the emitted light is absorbed by the red LED, it hardly feels to the eyes, but especially the wavelength of the blue LED of 500 nm or less has poor luminosity, so avoid absorption as much as possible. Is preferred.
【０００８】さらに、各ＬＥＤチップが載置される導電
体層の表面は、ＬＥＤチップの電極と導電体層との接着
性を高めるため、金メッキされているものが多い。しか
し、青色ＬＥＤを用いた場合、金は５００ｎｍ以下の波
長の反射率が低いので、青色ＬＥＤの発光を吸収すると
いう欠点がある。Further, the surface of the conductor layer on which each LED chip is mounted is often gold-plated in order to enhance the adhesion between the electrode of the LED chip and the conductor layer. However, when a blue LED is used, gold has a low reflectance at a wavelength of 500 nm or less, and thus has a drawback of absorbing the light emitted from the blue LED.
【０００９】従って、本発明はこのような事情を鑑みて
成されたものであり、その目的とするところは、発光波
長の異なるＬＥＤチップをセラミック基板上に複数載置
して一画素を形成するＬＥＤディスプレイにおいて、Ｌ
ＥＤチップの短波長の発光が吸収されるのを少なくして
ＬＥＤディスプレイの光度を向上させることにあり、特
に赤色、緑色、青色ＬＥＤチップと三原色揃ったＬＥＤ
ディスプレイの青色ＬＥＤの外部量子効率を改良してデ
ィスプレイの光度を向上させることにある。Therefore, the present invention has been made in view of such circumstances, and an object thereof is to mount a plurality of LED chips having different emission wavelengths on a ceramic substrate to form one pixel. In LED display, L
It is to improve the luminous intensity of the LED display by reducing the absorption of the short wavelength light emitted from the ED chip, and in particular the red, green, and blue LED chips and the LEDs in the three primary colors.
It is to improve the external quantum efficiency of the blue LED of the display to improve the luminous intensity of the display.
【００１０】[0010]
【課題を解決するための手段】本発明のＬＥＤディスプ
レイは、表面に導電体層が形成されたグリーンシートが
積層されてなるセラミック基板上に、発光波長の異なる
複数のＬＥＤチップが載置されて一画素が構成されたＬ
ＥＤディスプレイにおいて、前記ＬＥＤチップは短波長
のＬＥＤチップの発光部の高さが、長波長のＬＥＤチッ
プの発光部の高さよりも高くなるように載置されてお
り、さらにそのＬＥＤチップの高さが実質的にグリーン
シートの高さにより調整されていることを特徴とする。
つまり青色ＬＥＤの発光部の高さを、積層したグリーン
シートの高さで調整して最も高くすることにより、上記
問題を解決できる。In the LED display of the present invention, a plurality of LED chips having different emission wavelengths are mounted on a ceramic substrate formed by laminating green sheets having a conductor layer formed on the surface thereof. L consisting of one pixel
In the ED display, the LED chip is mounted such that the height of the light emitting portion of the short wavelength LED chip is higher than the height of the light emitting portion of the long wavelength LED chip, and the height of the LED chip is higher. Is substantially adjusted by the height of the green sheet.
That is, the above problem can be solved by adjusting the height of the light emitting portion of the blue LED to be the highest by adjusting the height of the stacked green sheets.
【００１１】さらに、前記ＬＥＤチップを包囲するグリ
ーンシート面は白色であることが好ましい。特に一画素
に５００ｎｍ以下に発光する青色ＬＥＤチップを含む場
合には、その青色ＬＥＤチップを載置するセラミック基
板面、つまりグリーンシート表面にある導電体層面の５
００ｎｍ〜３６０ｎｍの波長域における反射率が６０％
以上になるように調整することが好ましい。Further, the green sheet surface surrounding the LED chip is preferably white. In particular, when one pixel includes a blue LED chip emitting light of 500 nm or less, the surface of the ceramic substrate on which the blue LED chip is mounted, that is, the surface of the conductor layer on the surface of the green sheet is
60% reflectance in the wavelength range of 00 nm to 360 nm
It is preferable to adjust the above.
【００１２】[0012]
【作用】本発明のＬＥＤディスプレイでは短波長のＬＥ
Ｄチップの発光部の高さを、長波長のＬＥＤチップの発
光部の高さよりも高くすることにより、短波長の発光が
長波長のＬＥＤ材料に吸収されることがないので、短波
長のＬＥＤの外部量子効率が向上する。しかもそのＬＥ
Ｄの発光部の高さが実質的にグリーンシートの高さで調
整されている。ＬＥＤディスプレイのＬＥＤチップは、
一般に打ち抜きにより形成されたグリーンシートのキャ
ビティー（開口部）内に収容して載置される。さらにキ
ャビティーが設けられたグリーンシートを積層すること
によりその開口部の深さを自由に調整できる。従ってＬ
ＥＤを収容するグリーンシートの高さで実質的な発光部
の高さを調整すると、例えばスペーサーを介して調整す
る方法に比べて、直接ＬＥＤチップの高さを調整できる
ので、生産性にも優れている。The LED display of the present invention has a short wavelength LE.
By making the height of the light emitting portion of the D chip higher than the height of the light emitting portion of the long wavelength LED chip, short wavelength light is not absorbed by the long wavelength LED material. The external quantum efficiency of is improved. And that LE
The height of the light emitting portion of D is adjusted substantially by the height of the green sheet. The LED chip of the LED display is
Generally, it is housed and placed in the cavity (opening) of the green sheet formed by punching. Further, by stacking green sheets provided with cavities, the depth of the opening can be freely adjusted. Therefore L
Adjusting the substantial height of the light emitting part with the height of the green sheet that houses the ED allows the height of the LED chip to be adjusted directly compared to the method of adjusting via a spacer, which is also excellent in productivity. ing.
【００１３】さらにキャビティー内に収容されたＬＥＤ
チップを包囲するグリーンシート面を白色にすることに
より、ＬＥＤ発光がその白色面で反射されるのでさらに
発光効率が向上する。グリーンシート面を白色とするに
は例えば無着色の白色グリーンシートを積層することで
実現できるが、またその他酸化チタン、硫酸バリウム、
酸化マグネシウム、アルミナ等の可視光の反射率が高い
白色物質を塗布してもよい。最も好ましくは、その白色
面の反射率も５００ｎｍ〜３６０ｎｍの波長域において
６０％以上を実現すると、青色ＬＥＤを載置した場合に
おいてディスプレイの光度が向上する。Further, the LED housed in the cavity
By making the surface of the green sheet surrounding the chip white, the LED emission is reflected by the white surface, so that the luminous efficiency is further improved. To make the green sheet surface white, for example, it can be realized by stacking uncolored white green sheets, but in addition, titanium oxide, barium sulfate,
A white material having high visible light reflectance such as magnesium oxide or alumina may be applied. Most preferably, when the reflectance of the white surface is also 60% or more in the wavelength range of 500 nm to 360 nm, the luminous intensity of the display is improved when the blue LED is mounted.
【００１４】さらに一画素中に５００ｎｍ以下に発光す
る青色ＬＥＤチップを含む場合、青色ＬＥＤチップを載
置するセラミック基板面、つまりグリーンシート上に形
成された導電体層表面の５００ｎｍ〜３６０ｎｍの波長
域における反射率を６０％以上に調整することにより、
ＬＥＤ載置面で青色発光を反射させることができる。前
にも述べたように、従来のグリーンシート表面には一般
にＷ、Ｍｏ、Ａｇペースト等の導電性材料が印刷されて
パターン形成され、これらの材料とＬＥＤチップとの接
着性を高める目的で、この導電体層の表面にＡｕメッキ
が施されている。しかしながら青色ＬＥＤを用いた場
合、導電体層がＡｕメッキされていると、Ａｕは５００
ｎｍ〜３６０ｎｍの青色領域の反射率が低く、例えば５
０％以下でしかない。従って青色ＬＥＤを用いて新規な
フルカラーＬＥＤディスプレイが実現された場合、ＬＥ
Ｄチップを載置する導電性体層の反射率を６０％以上に
することにより、視感度の悪い青色発光の外部量子効率
を向上できる。５００ｎｍ〜３６０ｎｍの反射率が６０
％以上を示す材料として、例えばＡｌ、Ａｇ、Ｐｔ、Ｎ
ｉ等の金属を好ましく用いることができ、これらの材料
を導電体層にメッキ、または蒸着することにより、ＬＥ
Ｄを載置する導電体層面の反射率を前記範囲に調整でき
る。また青色ＬＥＤを載置して、前記のようにＬＥＤを
包囲するグリーンシート面を白色する場合、その白色面
の反射率を前記範囲内にすることは言うまでもない。な
お、本発明において、反射率とは種々の波長の光が垂直
に投射された場合の絶対反射率をいう。When one pixel includes a blue LED chip which emits light of 500 nm or less, the wavelength range of 500 nm to 360 nm on the surface of the ceramic substrate on which the blue LED chip is mounted, that is, the surface of the conductor layer formed on the green sheet. By adjusting the reflectance at 60% or more,
Blue light can be reflected on the LED mounting surface. As described above, the surface of the conventional green sheet is generally printed with a conductive material such as W, Mo, or Ag paste to form a pattern, and for the purpose of enhancing the adhesiveness between these materials and the LED chip, The surface of this conductor layer is plated with Au. However, when a blue LED is used, Au is 500 when the conductor layer is plated with Au.
nm to 360 nm has a low reflectance in the blue region, for example, 5
Only 0% or less. Therefore, if a new full-color LED display is realized using blue LEDs, LE
By setting the reflectance of the conductive layer on which the D chip is mounted to 60% or more, the external quantum efficiency of blue light emission with poor visibility can be improved. The reflectance of 500 nm to 360 nm is 60
%, A material having a content of, for example, Al, Ag, Pt, N
Metals such as i can be preferably used, and by plating or vapor depositing these materials on the conductor layer, LE
The reflectance of the surface of the conductor layer on which D is placed can be adjusted within the above range. In addition, when the blue LED is mounted and the surface of the green sheet surrounding the LED is whitened as described above, it goes without saying that the reflectance of the white surface is set within the above range. In the present invention, the reflectance means the absolute reflectance when light of various wavelengths is vertically projected.
【００１５】[0015]
【実施例】以下本発明の一実施例のＬＥＤディスプレイ
を図面を元に説明する。図１は本発明の一ＬＥＤディス
プレイをキャビティー側から見た平面図であり、図２は
図１の平面図を一点鎖線で切断した際の模式断面図であ
る。これらの図はいずれもディスプレイの一画素の一構
造を示し、同一符号は同一部材を示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An LED display according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an LED display of the present invention viewed from the cavity side, and FIG. 2 is a schematic cross-sectional view of the plan view of FIG. 1 taken along the alternate long and short dash line. Each of these drawings shows one structure of one pixel of the display, and the same reference numerals indicate the same members.
【００１６】このディスプレイは一画素がおよそ４６０
ｎｍに発光するＧａＮ系の材料よりなる青色ＬＥＤチッ
プＢと、およそ５５０ｎｍに発光するＧａＰ系の材料よ
りなる緑色ＬＥＤチップＧと、およそ６６０ｎｍに発光
するＧａＡｓ系の材料よりなる赤色ＬＥＤチップＲと各
々１個ずつよりなり、これらＬＥＤチップが直線上に並
べられている。This display has about 460 pixels.
a blue LED chip B made of a GaN-based material that emits light of about 550 nm, a green LED chip G made of a GaP-based material that emits light at about 550 nm, and a red LED chip R made of a GaAs-based material that emits light at about 660 nm. Each LED chip is arranged in a straight line.
【００１７】これらＬＥＤチップは、白色の酸化アルミ
ニウムよりなる厚さおよそ２００μｍのグリーンシート
１ａ、１ｂおよび１ｃを積層したセラミック基板上に載
置されている。グリーンシート１ａ、１ｂ、１ｃはその
表面にタングステンがそれぞれ数μｍの厚さでパターン
印刷された導電体層２ａ、２ｂ、２ｃを有し、さらに２
ａおよび２ｂの表面には数μｍの厚さでＡｕメッキが施
され、２ｃの表面にはＡｌが蒸着されている。なおＡｌ
の蒸着面の反射率は３６０ｎｍ〜５００ｎｍの範囲で９
０％以上ある。これら導電体層２の形成されたグリーン
シートは打ち抜きにより所定の形状の孔が打ち抜かれ、
孔の形成されたグリーンシートを積層することにより、
図２に示すような段差のあるセラミック基板ができあが
る。These LED chips are mounted on a ceramic substrate on which green sheets 1a, 1b and 1c made of white aluminum oxide and having a thickness of about 200 μm are laminated. The green sheets 1a, 1b, 1c have conductor layers 2a, 2b, 2c on each surface of which tungsten is pattern-printed with a thickness of several μm.
The surfaces of a and 2b are Au-plated with a thickness of several μm, and Al is deposited on the surface of 2c. Al
The reflectance of the vapor deposition surface of is 9 in the range of 360 nm to 500 nm.
There is 0% or more. The green sheet on which the conductor layer 2 is formed has a hole of a predetermined shape punched out,
By stacking green sheets with holes,
A stepped ceramic substrate as shown in FIG. 2 is completed.
【００１８】一画素を構成する同一キャビティー内に段
差の設けられた前記セラミック基板の下層の導電体層２
ａの上に赤色ＬＥＤチップＲを載置し、同じく中層の導
電体層２ｂの上に緑色ＬＥＤチップＧを載置し、上層の
導電体層２ｃの上に青色ＬＥＤチップＧを載置する。な
おＢ1は青色ＬＥＤチップＢの発光部、Ｇ1は緑色ＬＥＤ
チップＧの発光部、Ｒ1は赤色ＬＥＤチップの発光部を
示している。A conductor layer 2 below the ceramic substrate provided with a step in the same cavity forming one pixel.
The red LED chip R is mounted on a, the green LED chip G is mounted on the middle conductor layer 2b, and the blue LED chip G is mounted on the upper conductor layer 2c. B1 is a light emitting part of the blue LED chip B, and G1 is a green LED.
The light emitting portion of the chip G and R1 indicate the light emitting portion of the red LED chip.
【００１９】このようにして短波長のＬＥＤチップの発
光部を長波長のＬＥＤチップの発光部よりも高くするこ
とにより、短波長の発光が長波長に発光するＬＥＤチッ
プの材料に吸収されることがなくなるので、ディスプレ
イの光度が向上する。特に、図に示すように同一キャビ
ティー内に波長の異なる複数のＬＥＤチップを載置する
場合にその効果が大きい。By thus making the light emitting portion of the short wavelength LED chip higher than the light emitting portion of the long wavelength LED chip, the short wavelength light emission is absorbed by the material of the LED chip emitting the long wavelength light. The light intensity of the display is improved because there is no light. In particular, the effect is great when a plurality of LED chips having different wavelengths are mounted in the same cavity as shown in the figure.
【００２０】またＬＥＤチップを包囲した着色剤を含ま
ない白色の酸化アルミニウムは５００ｎｍ以下の青色領
域において反射率が高いので、青色ＬＥＤは言うにおよ
ばず、緑色ＬＥＤ、および赤色ＬＥＤの発光をも含め
て、キャビティー内で発光が吸収されることが少ない。
さらに短波長のＬＥＤチップの高さを高くしてあるの
で、グリーンシート面で反射された短波長の光は同一キ
ャビティー内にある長波長のＬＥＤ材料に吸収されるこ
とが少ないという効果も合わせ持つ。Further, since the colorant-free white aluminum oxide that surrounds the LED chip has a high reflectance in the blue region of 500 nm or less, not only the blue LED but also the light emission of the green LED and the red LED is included. As a result, light emission is less likely to be absorbed in the cavity.
Furthermore, since the height of the short-wavelength LED chip is increased, the short-wavelength light reflected by the green sheet surface is less likely to be absorbed by the long-wavelength LED material in the same cavity. To have.
【００２１】また、青色ＬＥＤチップＧを載置する導電
体層２ｃの表面を、例えばＡｌのような反射率の高い金
属で被覆しているために、青色発光が導電体層面におい
て吸収されるのを防ぐことができる。Further, since the surface of the conductor layer 2c on which the blue LED chip G is mounted is coated with a highly reflective metal such as Al, blue light emission is absorbed by the conductor layer surface. Can be prevented.
【００２２】なお付言すると、本発明のＬＥＤディスプ
レイにおいて一画素を構成する各発光色のＬＥＤチップ
の数はこれらの図に示すように一個ずつでなくてもよ
く、各ＬＥＤの光度により自由に変更でき、並べ方は直
線上でなくてもΔ（デルタ）配列等自由に変更できるこ
とは言うまでもない。またコントラストを向上させる目
的で図１および図３に示すカバー部材３の発光観測面側
の表面を黒色にしてもよい。It should be noted that, in the LED display of the present invention, the number of LED chips of each luminescent color forming one pixel does not have to be one as shown in these figures, and can be freely changed according to the luminous intensity of each LED. Needless to say, the arrangement can be freely changed even if the arrangement is not linear. The surface of the cover member 3 shown in FIGS. 1 and 3 on the light emission observation surface side may be black for the purpose of improving the contrast.
【００２３】[0023]
【発明の効果】以上説明したように、本発明のＬＥＤデ
ィスプレイは各ＬＥＤの発光部の高さがＬＥＤを載置す
るグリーンシートの高さにより調整されているので、ス
ペーサー等を介しなくても簡単にその高さが調整でき生
産性に優れている。さらに、短波長のＬＥＤチップの高
さを高くして、他の材料に吸収されなくしてあるのでデ
ィスプレイの光度が向上する。特に青色ＬＥＤを用いた
場合ではその効果が大きく、今後フルカラーＬＥＤディ
スプレイを実現する上でその意義は多大である。As described above, in the LED display of the present invention, since the height of the light emitting portion of each LED is adjusted by the height of the green sheet on which the LED is mounted, it is not necessary to use a spacer or the like. Its height can be easily adjusted and it has excellent productivity. In addition, the short-wavelength LED chip is increased in height so that it is not absorbed by other materials, which improves the luminous intensity of the display. Especially, when the blue LED is used, its effect is great, and its significance will be great in realizing a full-color LED display in the future.
【図１】 本発明の一ＬＥＤディスプレイをキャビティ
ー側から見た平面図。FIG. 1 is a plan view of an LED display of the present invention viewed from a cavity side.
【図２】 図１の平面図を一点鎖線で切断した際の模式
断面図。FIG. 2 is a schematic cross-sectional view of the plan view of FIG. 1 taken along the alternate long and short dash line.
【図３】 従来のＬＥＤディスプレイの構造を示す模式
断面図。FIG. 3 is a schematic cross-sectional view showing the structure of a conventional LED display.
１・・・・グリーンシート ２・・・・導電体層 ３・・・・カバー部材 1 ... Green sheet 2 ... Conductor layer 3 ... Cover member
Claims (3)
ートが積層されてなるセラミック基板上に、発光波長の
異なる複数のＬＥＤチップが載置されて一画素が構成さ
れたＬＥＤディスプレイにおいて、前記ＬＥＤチップは
短波長のＬＥＤチップの発光部の高さが、長波長のＬＥ
Ｄチップの発光部の高さよりも高くなるように載置され
ており、さらにそのＬＥＤチップの高さは実質的にグリ
ーンシートの高さにより調整されていることを特徴とす
るＬＥＤディスプレイ。1. An LED display in which a plurality of LED chips having different emission wavelengths are mounted on a ceramic substrate formed by laminating a green sheet having a conductor layer formed on the surface thereof to form one pixel. The height of the light emitting part of the LED chip of the short wavelength is LE of the long wavelength.
An LED display, wherein the LED chip is mounted so as to be higher than the light emitting portion of the D chip, and the height of the LED chip is substantially adjusted by the height of the green sheet.
ート面が白色であることを特徴とする請求項１に記載の
ＬＥＤディスプレイ。2. The LED display according to claim 1, wherein a green sheet surface surrounding the LED chip is white.
の波長に青色発光する青色ＬＥＤチップが載置されてお
り、さらにその青色ＬＥＤチップが載置されるセラミッ
ク基板面の５００ｎｍ〜３６０ｎｍの波長域における反
射率が６０％以上であることを特徴とする請求項１また
は請求項２に記載のＬＥＤディスプレイ。3. A blue LED chip that emits blue light having a wavelength of 500 nm or less is mounted on the ceramic substrate, and the reflection of the surface of the ceramic substrate on which the blue LED chip is mounted is reflected in a wavelength range of 500 nm to 360 nm. The LED display according to claim 1 or 2, wherein the ratio is 60% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6983694A JP3351447B2 (en) | 1994-04-08 | 1994-04-08 | LED display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6983694A JP3351447B2 (en) | 1994-04-08 | 1994-04-08 | LED display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07283438A true JPH07283438A (en) | 1995-10-27 |
| JP3351447B2 JP3351447B2 (en) | 2002-11-25 |
Family
ID=13414284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6983694A Expired - Fee Related JP3351447B2 (en) | 1994-04-08 | 1994-04-08 | LED display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3351447B2 (en) |
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