JPH05251023A - Phosphor screen of field emission display - Google Patents
Phosphor screen of field emission displayInfo
- Publication number
- JPH05251023A JPH05251023A JP8477592A JP8477592A JPH05251023A JP H05251023 A JPH05251023 A JP H05251023A JP 8477592 A JP8477592 A JP 8477592A JP 8477592 A JP8477592 A JP 8477592A JP H05251023 A JPH05251023 A JP H05251023A
- Authority
- JP
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- Prior art keywords
- phosphor
- field emission
- fluorescent film
- brightness
- film
- 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.)
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- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はフラットパネルディスプ
レイの蛍光膜に係り、特に電界放出カソードと、それと
対向するアノードとを有し、アノード側に設けられた蛍
光膜を中速の加速電圧の電子線で励起して発光させる構
造を有するフィールドエミッションディスプレイの蛍光
膜に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent film for a flat panel display, and more particularly to a fluorescent film having a field emission cathode and an anode facing the field emission cathode. The present invention relates to a fluorescent film of a field emission display having a structure that emits light when excited by a line.
【0002】[0002]
【従来の技術】最近、数多くのメーカー、研究機関でフ
ラットパネルディスプレイが研究されており、その中で
も電界放出カソード(Field Emission Cathode)を用い
たフィールドエミッションディスプレイ(以下、FED
という)が注目されている。電界放出カソードとは冷陰
極カソードの一種であり、既にいくつか発表されてい
る。{第38回応用物理学関係連合講演会講演予稿集、
No.2、p525、(1991)、第52回応用物理学関係連合講演
会講演予稿集、No.2、p505、(1991)}2. Description of the Related Art Recently, flat panel displays have been studied by many manufacturers and research institutes. Among them, field emission displays (Field Emission Cathode) are used.
Is called). A field emission cathode is a type of cold cathode cathode, and some of them have already been announced. {Proceedings of the 38th Joint Lecture on Applied Physics,
No.2, p525, (1991), Proceedings of the 52nd Joint Lecture on Applied Physics, No.2, p505, (1991)}
【0003】FEDの構造を図1で簡単に説明すると、
これは基本的に電界放出カソード(FEカソード)と、
それと対向するアノードとを有し、アノード側に設けら
れた蛍光膜を中速の加速電圧の電子線で励起して発光さ
せる構造を有するフラットパネルディスプレイであり、
電界放出カソードから発せられる電子をアノードでおよ
そ0.1〜2kVの中速に加速して、アノード側の前面
ガラス板に蛍光体が塗布されて成る蛍光膜を励起して発
光させるものである。The structure of the FED will be briefly described with reference to FIG.
This is basically a field emission cathode (FE cathode),
A flat panel display having a structure having an anode facing it and exciting a fluorescent film provided on the anode side with an electron beam of a medium speed accelerating voltage to emit light.
Electrons emitted from the field emission cathode are accelerated by the anode at a medium speed of about 0.1 to 2 kV to excite a phosphor film formed by coating a phosphor on a front glass plate on the anode side to emit light.
【0004】[0004]
【発明が解決しようとする課題】上記のような構造のF
EDにおいて、他のフラットパネルディスプレイ、例え
ばプラズマディスプレイ、液晶ディスプレイ等に対抗す
るためには、FED自体の輝度を上げる必要があり、輝
度を上げる要因は、ほとんどが蛍光膜の特性に依存して
いる。The above-mentioned structure of the F
In order to compete with other flat panel displays such as plasma displays and liquid crystal displays in EDs, it is necessary to increase the brightness of the FED itself, and most of the factors that increase the brightness depend on the characteristics of the fluorescent film. ..
【0005】前記したようにFEDの蛍光膜は加速電圧
が0.1〜2kVと比較的中速の電子線で励起されるた
め、電子線への蛍光体の侵入深さが比較的浅い。そのた
めCRT並の輝度を得るには、高電流密度の電子線で蛍
光膜が励起されるため、それを構成する蛍光体には、中
速の電子線で輝度が高いことが求められる。As described above, since the FED fluorescent film is excited by an electron beam having an accelerating voltage of 0.1 to 2 kV and a relatively medium speed, the penetration depth of the phosphor into the electron beam is relatively shallow. Therefore, in order to obtain a brightness comparable to that of a CRT, the fluorescent film is excited by an electron beam having a high current density. Therefore, the phosphor constituting the fluorescent film is required to have a high brightness with a medium-speed electron beam.
【0006】しかしながら、FEDの蛍光膜自体もよく
研究されておらず、未だどのような蛍光体をどのように
塗布すれば輝度の高い蛍光膜が得られるのかもよく知ら
れていないのが実状である。However, the FED fluorescent film itself has not been well researched, and it is not known well yet what kind of fluorescent substance and how to apply it to obtain a fluorescent film with high brightness. is there.
【0007】従って、本発明はこのような事情を鑑み成
されたものであり、その目的とするところは、およそ
0.1〜2kVの中速の電子線で励起される蛍光膜を有
するFEDの高輝度な蛍光膜を提供するものである。Therefore, the present invention has been made in view of such circumstances, and an object of the present invention is to provide an FED having a fluorescent film excited by a medium-speed electron beam of about 0.1 to 2 kV. It is intended to provide a fluorescent film with high brightness.
【0008】[0008]
【課題を解決するための手段】本発明者らはFEDの輝
度を向上させるため、FEDの蛍光膜に関し、数々の実
験を行った結果、その蛍光膜を構成する蛍光体の粒径を
小さくして表面積を大きくし、さらに薄く塗布すること
により上記目的が達成できることを見いだし本発明を成
すに至った。In order to improve the brightness of the FED, the inventors of the present invention conducted various experiments on the fluorescent film of the FED, and as a result, reduced the particle size of the fluorescent substance forming the fluorescent film. It has been found that the above object can be achieved by increasing the surface area and applying a thinner layer, thus completing the present invention.
【0009】即ち、本発明のFEDの蛍光膜は、少なく
とも電界放出カソードと、それと対向するアノードとを
有し、アノード側に設けられた蛍光膜をおよそ0.1〜
2kVの中速の加速電圧の電子線で励起して発光させる
構造を有するFEDにおいて、前記蛍光膜は中心粒径
0.1μm以上、4μm以下の蛍光体が0.2mg/cm2
以上、3.0mg/cm2以下の塗布量で塗布されているこ
とを特徴とするものである。尚、本発明において、中心
粒径とはコールターカウンター法で測定した蛍光体の粒
度分布における積算分布の50%に当たる粒径をいい、
一般にD50値として表されている。That is, the fluorescent film of the FED according to the present invention has at least a field emission cathode and an anode facing the field emission cathode, and the fluorescent film provided on the anode side is about 0.1 to 10.
In the FED having a structure that emits light by being excited by an electron beam having a medium-speed acceleration voltage of 2 kV, the phosphor film has a central particle size of 0.1 μm or more and 4 μm or less of 0.2 mg / cm 2
As described above, it is characterized in that the coating amount is 3.0 mg / cm 2 or less. In the present invention, the central particle size means a particle size corresponding to 50% of the cumulative distribution in the particle size distribution of the phosphor measured by the Coulter counter method,
Generally expressed as a D50 value.
【0010】前記蛍光膜を得るために使用できる蛍光体
としては電子線で励起されて発光する陰極線管用蛍光体
であればどのようなものでもよく、例えば青色発光蛍光
体としてZnS:Ag,X蛍光体、Y2SiO5:Ce蛍
光体、LnOX:Ce蛍光体(Lnは希土類元素、Xは
Al、またはハロゲン元素)、緑色発光蛍光体としてZ
nS:Cu,X蛍光体、Y3Al5O12:Tb蛍光体、Y3
(Al,Ga)5O12:Tb蛍光体、Y2SiO5:Tb蛍
光体、赤色発光蛍光体としてY2O2S:Eu蛍光体、Y
2O3:Eu蛍光体、Y2O2S:Eu,Sm蛍光体等を好
ましく用いることができ、特に、青色発光蛍光体とし
て、Agを母体に対し300ppm以上、1500pp
m以下の範囲で含有するZnS:Ag,X(但しXはA
l、ハロゲン元素の内の少なくとも一種)蛍光体を好ま
しく用いることができ、緑色発光蛍光体としてCuを母
体に対し200ppm以上、1500ppm以下の範囲
で含有するZnS:Cu,X蛍光体、またはAuを母体に
対し200ppm以上、1500ppm以下の範囲で含
有するZnS:Au,X蛍光体、またはCuを200pp
m以上1500ppm以下、およびAuを100ppm
以上600ppm以下含有するZnS:Cu,Au,X蛍
光体を好ましく用いることができ、また赤色発光蛍光体
としてEuを母体に対し1%以上、10%以下の範囲で
含有するY2O2S:Eu蛍光体、またはY2O3:Eu蛍
光体を好ましく用いることができる。The phosphor that can be used to obtain the above-mentioned phosphor film may be any phosphor as long as it is a phosphor for a cathode ray tube that is excited by an electron beam to emit light. For example, as a blue-emitting phosphor, ZnS: Ag, X fluorescence is used. Body, Y 2 SiO 5 : Ce phosphor, LnOX: Ce phosphor (Ln is a rare earth element, X is Al, or a halogen element), and Z is a green light emitting phosphor.
nS: Cu, X phosphor, Y 3 Al 5 O 12 : Tb phosphor, Y 3
(Al, Ga) 5 O 12 : Tb phosphor, Y 2 SiO 5 : Tb phosphor, Y 2 O 2 S: Eu phosphor as a red light emitting phosphor, Y
2 O 3 : Eu phosphor, Y 2 O 2 S: Eu, Sm phosphor and the like can be preferably used. Particularly, as a blue light emitting phosphor, Ag is 300 ppm or more with respect to the base material, 1500 pp.
ZnS: Ag, X (where X is A
1, at least one of halogen elements) phosphor can be preferably used, and ZnS: Cu, X phosphor containing Au in the range of 200 ppm or more and 1500 ppm or less with respect to the matrix as a green-emitting phosphor, or Au. 200 pp of ZnS: Au, X phosphor or Cu contained in the range of 200 ppm or more and 1500 ppm or less with respect to the base material
m to 1500 ppm and Au to 100 ppm
ZnS: Cu, Au, X phosphor containing 600 ppm or less can be preferably used, and Y 2 O 2 S containing Eu in the range of 1% or more and 10% or less with respect to the host as a red light emitting phosphor: Eu phosphor or Y 2 O 3 : Eu phosphor can be preferably used.
【0011】[0011]
【作用】図2に、中心粒径0.5μm、1μm、2.5
μm、4μm、8μmのZnS:Ag,Al青色発光蛍
光体(Ag付活量:ZnS母体に対し650ppm)
を、それぞれ塗布量を変えてガラス板に塗布し、ガラス
板の蛍光膜を数々の加速電圧で励起した場合に、それぞ
れの蛍光膜における蛍光体塗布量と、蛍光膜の輝度との
関係を、各加速電圧で比較して表す図を示す。図2にお
いて、図2−Aは加速電圧20kV、図2−Bは同じく
4kV、図2−Cは2kV、図2−Dは0.5kV、図
2−Eは0.3kV、図2−Fは0.1kVで蛍光膜を
励起したときの図であり、それぞれの図において、各蛍
光膜の相対輝度は、中心粒径8μmの蛍光体を最適塗布
量で塗布したときの輝度を100%として示す。Function: As shown in FIG. 2, the median particle diameter is 0.5 μm, 1 μm, 2.5.
μm, 4 μm, 8 μm ZnS: Ag, Al blue light emitting phosphor (Ag activation amount: 650 ppm based on ZnS matrix)
Is applied to a glass plate while changing the coating amount, and when the fluorescent film of the glass plate is excited by various accelerating voltages, the relationship between the fluorescent substance coating amount in each fluorescent film and the brightness of the fluorescent film, The figure which compares and shows with each accelerating voltage is shown. 2, FIG. 2-A shows an acceleration voltage of 20 kV, FIG. 2-B shows the same 4 kV, FIG. 2-C shows 2 kV, FIG. 2-D shows 0.5 kV, FIG. 2-E shows 0.3 kV, and FIG. Is a diagram when the phosphor film is excited at 0.1 kV. In each figure, the relative brightness of each phosphor film is 100% when the phosphor having a central particle diameter of 8 μm is applied at the optimum application amount. Show.
【0012】A〜Bに示すように加速電圧の高いところ
では蛍光体の粒径が大きいほどその輝度は高いが、C〜
Fに示すように、加速電圧が低くなるにつれて粒径の小
さな蛍光体の方がその輝度が高くなっていく傾向にあ
り、FED用蛍光体の加速電圧域0.1kV〜2kVの
範囲では蛍光体の粒径を4μm以下とする方が輝度が高
いことが分かる。As shown in A to B, the larger the particle size of the phosphor, the higher the brightness at a high accelerating voltage.
As shown in F, the brightness of the phosphor having a smaller particle size tends to increase as the accelerating voltage decreases, and the phosphor is used in the accelerating voltage range of 0.1 kV to 2 kV of the phosphor for FED. It can be seen that the brightness is higher when the particle size is less than 4 μm.
【0013】また図3に、同じく中心粒径0.5μm、
1μm、2.5μm、4μm、8μmのZnS:Cu,
Al緑色発光蛍光体(Cu付活量:ZnS母体に対し4
00ppm)を、それぞれ塗布量を変えてガラス板に塗
布し、ガラス板の蛍光膜を数々の加速電圧で励起した場
合に、各蛍光膜における蛍光体塗布量と、蛍光膜の輝度
との関係を、各加速電圧で比較して表す図を示す。同様
に図3において、図3−Aは加速電圧20kV、図3−
Bは同じく4kV、図3−Cは2kV、図3−Dは0.
5kV、図3−Eは0.3kV、図3−Fは0.1kV
で蛍光膜を励起したときの図であり、それぞれの図にお
いて、各蛍光膜の相対輝度は、中心粒径8μmの蛍光体
を最適塗布重量で塗布したときの輝度を100%として
示す。Also in FIG. 3, the central particle size is 0.5 μm,
1 μm, 2.5 μm, 4 μm, 8 μm ZnS: Cu,
Al green light emitting phosphor (Cu activation amount: 4 with respect to ZnS matrix)
(00 ppm) is applied to a glass plate with different coating amounts, and when the fluorescent film of the glass plate is excited by various acceleration voltages, the relationship between the fluorescent substance coating amount of each fluorescent film and the brightness of the fluorescent film is shown. , Shows a diagram for comparison at each accelerating voltage. Similarly, in FIG. 3, FIG. 3-A shows an acceleration voltage of 20 kV, and FIG.
B is 4 kV, FIG. 3-C is 2 kV, and FIG. 3-D is 0.
5kV, 0.3kV in Figure 3-E, 0.1kV in Figure 3-F
FIG. 3 is a diagram when the phosphor film is excited by, and in each figure, the relative brightness of each phosphor film is shown assuming that the brightness when a phosphor having a central particle diameter of 8 μm is applied at an optimum application weight is 100%.
【0014】先ほどの図と同様に緑色発光蛍光体におい
ても加速電圧の高いところでは蛍光体の粒径が大きいほ
どその輝度は高く、加速電圧が低くなるにつれて粒径の
小さな蛍光体の方がその輝度が高くなっていく傾向にあ
り、FED用蛍光体の加速電圧域0.1kV〜2kVの
範囲では蛍光体の粒径を4μm以下とする方が輝度が高
いことが分かる。As in the previous figure, in the green light emitting phosphor, the larger the particle size of the phosphor is, the higher its brightness is in the place where the acceleration voltage is high, and the smaller the particle size is as the acceleration voltage is lower. It can be seen that the brightness tends to increase, and that the brightness is higher when the particle size of the phosphor is 4 μm or less in the acceleration voltage range of 0.1 kV to 2 kV of the FED phosphor.
【0015】図4に、ZnS母体に対しAgの付活量を
変えて試作した中心粒径2.5μmのZnS:Ag,A
l青色発光蛍光体を、各加速電圧における最適塗布量で
それぞれガラス板に塗布して蛍光膜を作成し、それぞれ
の蛍光膜を数々の加速電圧で励起した場合に、ZnS母
体に対するAgの付活量とその蛍光膜の輝度との関係
を、各加速電圧で比較して表す図を示す。図4−Aは加
速電圧20kV、図4−Bは4kV、図4−Cは2k
V、図4−Dは0.5kV、図4−Eは0.3kV、図
4−Fは0.1kVで蛍光膜を励起したときの図であ
り、それぞれの図において、各蛍光膜の相対輝度は、A
g付活量300ppm蛍光体を塗布したときの輝度を1
00%として示す。In FIG. 4, ZnS: Ag, A having a central particle size of 2.5 μm was manufactured by changing the activation amount of Ag with respect to the ZnS matrix.
l The blue light-emitting phosphor is applied to a glass plate at an optimum coating amount at each accelerating voltage to form a phosphor film, and when each phosphor film is excited at various accelerating voltages, the activation of Ag on the ZnS matrix is activated. The figure which shows the relationship between quantity and the brightness | luminance of the fluorescent film in comparison with each accelerating voltage is shown. Fig. 4-A shows an acceleration voltage of 20 kV, Fig. 4-B shows 4 kV, and Fig. 4-C shows 2 kV.
V, FIG. 4-D is 0.5 kV, FIG. 4-E is 0.3 kV, and FIG. 4-F is a diagram when the fluorescent film is excited at 0.1 kV. In each figure, the relative of each fluorescent film is shown. The brightness is A
g Brightness when applying phosphor with an activation amount of 300 ppm is 1
Shown as 00%.
【0016】図5に、ZnS母体に対しCuの付活量を
変えて試作した中心粒径2.5μmのZnS:Cu,A
l緑色発光蛍光体を、先ほどと同じく各加速電圧におけ
る最適塗布量でそれぞれガラス板に塗布して蛍光膜を作
成し、それぞれの蛍光膜を数々の加速電圧で励起した場
合に、ZnS母体に対するCuの付活量とその蛍光膜の
輝度との関係を、各加速電圧で比較して表す図を示す。
同じく図5において、図5−Aは加速電圧20kV、図
5−Bは4kV、図5−Cは2kV、図5−Dは0.5
kV、図5−Eは0.3kV、図5−Fは0.1kVで
蛍光膜を励起したときの図であり、それぞれの図におい
て、各蛍光膜の相対輝度は、Cu付活量200ppmの
蛍光体を塗布したときの輝度を100%として示す。FIG. 5 shows ZnS: Cu, A having a central particle diameter of 2.5 μm, which was produced by changing the activation amount of Cu with respect to the ZnS matrix.
The green light emitting phosphor was applied to the glass plate at the optimum coating amount at each accelerating voltage as before to form a phosphor film, and when each phosphor film was excited at various accelerating voltages, Cu for the ZnS matrix was formed. FIG. 6 is a diagram showing the relationship between the activation amount of Pt and the brightness of the phosphor film thereof at each accelerating voltage.
Also in FIG. 5, FIG. 5-A shows an acceleration voltage of 20 kV, FIG. 5-B shows 4 kV, FIG. 5-C shows 2 kV, and FIG.
kV, FIG. 5-E is 0.3 kV, and FIG. 5-F is a diagram when the fluorescent film is excited at 0.1 kV. In each figure, the relative brightness of each fluorescent film is 200 ppm of Cu activation amount. The luminance when the phosphor is applied is shown as 100%.
【0017】図6に、ZnS母体に対しAuの付活量を
変えて試作した中心粒径2.5μmのZnS:Au,A
l緑色発光蛍光体を、先ほどと同じく各加速電圧におけ
る最適塗布量でそれぞれガラス板に塗布して蛍光膜を作
成し、それぞれの蛍光膜を数々の加速電圧で励起した場
合に、ZnS母体に対するAuの付活量とその蛍光膜の
輝度との関係を、各加速電圧で比較して表す図を示す。
同じく図6において、図6−Aは加速電圧20kV、図
6−Bは4kV、図6−Cは2kV、図6−Dは0.5
kV、図6−Eは0.3kV、図6−Fは0.1kVで
蛍光膜を励起したときの図であり、それぞれの図におい
て、各蛍光膜の相対輝度は、Au付活量200ppmの
蛍光体を塗布したときの輝度を100%として示す。In FIG. 6, ZnS: Au, A having a central particle size of 2.5 μm was manufactured by changing the activation amount of Au with respect to the ZnS matrix.
The green light emitting phosphor was coated on a glass plate at the optimum coating amount at each acceleration voltage to form a phosphor film, and when each phosphor film was excited at various acceleration voltages, Au for ZnS matrix was formed. FIG. 6 is a diagram showing the relationship between the activation amount of Pt and the brightness of the phosphor film thereof at each accelerating voltage.
Similarly, in FIG. 6, FIG. 6-A shows an acceleration voltage of 20 kV, FIG. 6-B shows 4 kV, FIG. 6-C shows 2 kV, and FIG. 6-D shows 0.5 kV.
kV, FIG. 6-E is 0.3 kV, and FIG. 6-F is a diagram when the fluorescent film is excited at 0.1 kV. In each drawing, the relative luminance of each fluorescent film is Au activation of 200 ppm. The luminance when the phosphor is applied is shown as 100%.
【0018】図7に、Y2O2S母体に対しEuの付活量
を変えて試作した中心粒径2.5μmのY2O2S:Eu
赤色発光蛍光体を、先ほどと同じく各加速電圧における
最適塗布量でそれぞれガラス板に塗布して蛍光膜を作成
し、それぞれの蛍光膜を数々の加速電圧で励起した場合
に、Y2O2S母体に対するEuの付活量とその蛍光膜の
輝度との関係を、各加速電圧で比較して表す図を示す。
同じく図7において、図7−Aは加速電圧20kV、図
7−Bは4kV、図7−Cは2kV、図7−Dは0.5
kV、図7−Eは0.3kV、図7−Fは0.1kVで
蛍光膜を励起したときの図であり、それぞれの図におい
て、各蛍光膜の相対輝度は、Eu付活量1%の蛍光体を
塗布したときの輝度を100%として示す。FIG. 7 shows Y 2 O 2 S: Eu having a central particle diameter of 2.5 μm, which was produced by changing the activation amount of Eu with respect to the Y 2 O 2 S matrix.
When the red light emitting phosphor is applied to the glass plate at the optimum coating amount at each accelerating voltage as before to form a phosphor film and each phosphor film is excited by various accelerating voltages, Y 2 O 2 S The figure which shows the relationship between the activation amount of Eu with respect to a base | substrate and the brightness | luminance of the fluorescent film in comparison with each accelerating voltage is shown.
Similarly, in FIG. 7, the acceleration voltage is 20 kV in FIG. 7-A, 4 kV in FIG. 7-B, 2 kV in FIG. 7-C, and 0.5 in FIG. 7-D.
kV, FIG. 7-E is 0.3 kV, and FIG. 7-F is a diagram when the fluorescent film is excited at 0.1 kV. In each figure, the relative luminance of each fluorescent film is 1% Eu activation. The luminance when the above phosphor is applied is shown as 100%.
【0019】図8に、Y2O3母体に対しEuの付活量を
変えて試作した中心粒径2.5μmのY2O3:Eu赤色
発光蛍光体を、先ほどと同じく各加速電圧における最適
塗布量でそれぞれガラス板に塗布して蛍光膜を作成し、
それぞれの蛍光膜を数々の加速電圧で励起した場合に、
Y2O3母体に対するEuの付活量とその蛍光膜の輝度と
の関係を、各加速電圧で比較して表す図を示す。同じく
図8において、図8−Aは加速電圧20kV、図8−B
は4kV、図8−Cは2kV、図8−Dは0.5kV、
図8−Eは0.3kV、図8−Fは0.1kVで蛍光膜
を励起したときの図であり、それぞれの図において、各
蛍光膜の相対輝度は、Eu付活量1%の蛍光体を塗布し
たときの輝度を100%として示す。FIG. 8 shows a Y 2 O 3 : Eu red light-emitting phosphor having a central particle size of 2.5 μm, which was produced by changing the activation amount of Eu with respect to the Y 2 O 3 matrix, at each accelerating voltage as before. Apply the optimum amount of coating to each glass plate to create a fluorescent film,
When each fluorescent film is excited with various acceleration voltages,
The relationship between Y 2 O 3 amount of Eu to the parent and the luminance of the phosphor film shows a diagram representing, compared with the accelerating voltage. Similarly, in FIG. 8, FIG. 8-A shows an acceleration voltage of 20 kV, and FIG.
Is 4 kV, FIG. 8-C is 2 kV, and FIG. 8-D is 0.5 kV.
FIG. 8-E is a diagram when the fluorescent film is excited at 0.3 kV, and FIG. 8-F is a diagram when the fluorescent film is excited at 0.1 kV. In each figure, the relative luminance of each fluorescent film is the fluorescence with the Eu activation amount of 1%. The brightness when the body is applied is shown as 100%.
【0020】図4において、ZnS:Ag,Al蛍光体
は通常のCRTで使用される加速電圧の領域(A〜B)
では付活剤であるAgの濃度を多くしても、その蛍光膜
の輝度はほとんど変わらないか、若干高くなる程度であ
るが、C〜Fに示すFED用蛍光体の加速電圧域におい
ては、付活剤のAgの付活量による輝度の最適値が現
れ、その付活量が300ppm〜1500ppmが好ま
しく、400〜1200ppmの範囲がさらに好まし
い。In FIG. 4, the ZnS: Ag, Al phosphor is the acceleration voltage range (AB) used in a normal CRT.
Then, even if the concentration of the activator Ag is increased, the brightness of the phosphor film is hardly changed or slightly increased, but in the accelerating voltage range of the phosphor for FED shown in C to F, The optimum value of the brightness appears depending on the activation amount of Ag of the activator, and the activation amount is preferably 300 ppm to 1500 ppm, more preferably 400 to 1200 ppm.
【0021】図5においても同様に、C〜Fに示すFE
D用蛍光体の加速電圧域においては、ZnS:Cu,A
l蛍光体のCuの付活量による輝度の最適値が現れ、そ
の付活量は200ppm〜1500ppmが好ましく、
300〜1200ppmの範囲がさらに好ましい。Similarly in FIG. 5, the FEs shown in C to F are also shown.
In the acceleration voltage range of the phosphor for D, ZnS: Cu, A
The optimum value of the brightness appears depending on the Cu activation amount of the l phosphor, and the activation amount is preferably 200 ppm to 1500 ppm,
The range of 300 to 1200 ppm is more preferable.
【0022】図6においても同様に、C〜Fに示すFE
D用蛍光体の加速電圧域においては、ZnS:Au,A
l蛍光体のAuの付活量による輝度の最適値が現れ、そ
の付活量は200ppm〜1500ppmが好ましく、
300〜1200ppmの範囲がさらに好ましい。Similarly in FIG. 6, the FEs shown in C to F are also shown.
In the accelerating voltage range of the D phosphor, ZnS: Au, A
The optimum value of the brightness appears depending on the activation amount of Au of the l phosphor, and the activation amount is preferably 200 ppm to 1500 ppm,
The range of 300 to 1200 ppm is more preferable.
【0023】図7においても同様に、C〜Fに示すFE
D用蛍光体の加速電圧域においては、Y2O2S:Eu蛍
光体のEuの付活量による輝度の最適値が現れ、その付
活量は1%〜10%が好ましく、3%〜8%の範囲がさ
らに好ましい。Similarly in FIG. 7, the FEs shown in C to F are also shown.
In the accelerating voltage range of the D phosphor, the optimum value of the luminance appears depending on the Eu activation amount of the Y 2 O 2 S: Eu phosphor, and the activation amount is preferably 1% to 10%, and 3% to The range of 8% is more preferable.
【0024】図8においても同様に、C〜Fに示すFE
D用蛍光体の加速電圧域においては、Y2O3:Eu蛍光
体のEuの付活量による輝度の最適値が現れ、その付活
量は1%〜10%が好ましく、3%〜8%の範囲がさら
に好ましい。Similarly in FIG. 8, the FEs shown in C to F are also shown.
In the accelerating voltage range of the D phosphor, an optimum value of the brightness appears depending on the Eu activation amount of the Y 2 O 3 : Eu phosphor, and the activation amount is preferably 1% to 10%, and 3% to 8%. The range of% is more preferable.
【0025】また、特に図示しないが、ZnS:Cu,
Au,X(但し、XはAl、ハロゲン元素の内の少なく
とも一種)で表される緑色発光蛍光体についても、図4
〜図8と同様の傾向がみられ、FED用蛍光体の加速電
圧域においては、CuおよびAuの付活量は、Cuが2
00ppm以上1500ppm以下、Auが100pp
m以上600ppm以下であることが好ましい。Although not particularly shown, ZnS: Cu,
The green light-emitting phosphor represented by Au, X (where X is at least one of Al and halogen elements) is also shown in FIG.
The same tendency as in FIG. 8 is observed, and in the accelerating voltage range of the FED phosphor, the activation amount of Cu and Au is 2 for Cu.
00ppm or more and 1500ppm or less, Au is 100pp
It is preferably m or more and 600 ppm or less.
【0026】[0026]
[実施例1〜20]付活剤としてAgを650ppm含
むZnS:Ag,Al蛍光体を表1に示す粒径で試作
し、その蛍光体を20g分取する。[Examples 1 to 20] A ZnS: Ag, Al phosphor containing 650 ppm of Ag as an activator was trial-produced with a particle size shown in Table 1, and 20 g of the phosphor was sampled.
【0027】次に、バインダーとしてHPC(ヒドロキ
シプロピルセルロース)10gを水100mlとエチレ
ングリコール100mlに溶解した溶液を用意し、この
バインダーと前述の蛍光体20gとを表1に示す割合で
混合して塗布ペーストを作成する。Next, a solution prepared by dissolving 10 g of HPC (hydroxypropyl cellulose) in 100 ml of water and 100 ml of ethylene glycol was prepared as a binder, and this binder and 20 g of the above-mentioned phosphor were mixed and applied at the ratio shown in Table 1. Create a paste.
【0028】この塗布ペーストをガラス基板上にスクリ
ーン塗布した後、乾燥し、500℃でベーキングするこ
とにより、表1に示す塗布量の蛍光膜が出来上がる。な
お、塗布量はバインダーの混合量によって調整する。The coating paste is screen-coated on a glass substrate, dried, and baked at 500 ° C. to obtain a fluorescent film having the coating amount shown in Table 1. The coating amount is adjusted by the amount of binder mixed.
【0029】この蛍光膜を0.1kV、0.3kV、
0.5kV、2kVの加速電圧で励起して発光させたと
ころ、表1に示す輝度を得た。 以下余白This fluorescent film is applied with 0.1 kV, 0.3 kV,
When excited by an accelerating voltage of 0.5 kV and 2 kV to emit light, the brightness shown in Table 1 was obtained. Margin below
【0030】[0030]
【表1】 [Table 1]
【0031】[0031]
【発明の効果】以上述べたように、FEDの蛍光膜を構
成する蛍光体の中心粒径を0.1μm〜4μmとし、さ
らにその塗布量を0.2mg/cm2〜3.0mg/cm2とす
ることにより発光輝度に優れた蛍光膜を提供することが
でき、今後、開発されていくであろうフラットパネルデ
ィスプレイの蛍光膜として、その利用価値は大きい。As described above, the median particle diameter of the phosphor constituting the FED phosphor film is 0.1 μm to 4 μm, and the coating amount is 0.2 mg / cm 2 to 3.0 mg / cm 2 As a result, it is possible to provide a fluorescent film having excellent emission brightness, and its utility value is great as a fluorescent film for a flat panel display that will be developed in the future.
【0032】本発明の蛍光膜にIn、Sn等の導電性酸
化物を混合し、または蛍光体にそれらの導電性酸化物を
混合、付着、被覆してもよく、輝度、寿命の向上に効果
がある。The fluorescent film of the present invention may be mixed with a conductive oxide such as In, Sn or the like, or the fluorescent substance may be mixed with, adhered to, or coated with a conductive oxide, which is effective in improving the brightness and the life. There is.
【図1】 フィールドエミッションディスプレイの一構
造を示す模式断面図。FIG. 1 is a schematic cross-sectional view showing one structure of a field emission display.
【図2】 本発明の一実施例に係る蛍光膜における蛍光
体塗布量と、蛍光膜の輝度との関係を、各加速電圧で比
較して表す図。FIG. 2 is a diagram showing the relationship between the phosphor coating amount and the brightness of the phosphor film in the phosphor film according to an embodiment of the present invention, comparing the acceleration voltages with each other.
【図3】 本発明の一実施例に係る蛍光膜における蛍光
体塗布量と、蛍光膜の輝度との関係を、各加速電圧で比
較して表す図。FIG. 3 is a diagram showing the relationship between the phosphor coating amount and the brightness of the phosphor film in the phosphor film according to one embodiment of the present invention, comparing the acceleration voltages with each other.
【図4】 ZnS母体に対するAgの付活量とその蛍光
膜の輝度との関係を、各加速電圧で比較して表す図。FIG. 4 is a graph showing the relationship between the activation amount of Ag with respect to the ZnS matrix and the brightness of the phosphor film at each accelerating voltage.
【図5】 ZnS母体に対するCuの付活量とその蛍光
膜の輝度との関係を、各加速電圧で比較して表す図。FIG. 5 is a diagram showing the relationship between the activation amount of Cu with respect to the ZnS matrix and the brightness of the phosphor film thereof at each accelerating voltage.
【図6】 ZnS母体に対するAuの付活量とその蛍光
膜の輝度との関係を、各加速電圧で比較して表す図。FIG. 6 is a graph showing the relationship between the activation amount of Au with respect to the ZnS matrix and the brightness of the phosphor film, for each acceleration voltage.
【図7】 Y2O2S母体に対するEuの付活量とその蛍
光膜の輝度との関係を、各加速電圧で比較して表す図。FIG. 7 is a diagram showing the relationship between the activation amount of Eu with respect to the Y 2 O 2 S matrix and the brightness of the phosphor film, for each acceleration voltage.
【図8】 Y2O3母体に対するEuの付活量とその蛍光
膜の輝度との関係を、各加速電圧で比較して表す図。FIG. 8 is a diagram showing the relationship between the activation amount of Eu with respect to the Y 2 O 3 matrix and the brightness of the phosphor film at each accelerating voltage.
【手続補正書】[Procedure amendment]
【提出日】平成4年5月27日[Submission date] May 27, 1992
【手続補正1】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】請求項1[Name of item to be corrected] Claim 1
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
Claims (2)
対向するアノードとを有し、アノード側に設けられた蛍
光膜をおよそ0.1〜2kVの加速電圧の電子線で励起
して発光させる構造を有するフィールドエミッションデ
ィスプレイにおいて、前記蛍光膜は中心粒径0.1μm
以上、4μm以下の蛍光体が0.2mg/cm2以上、3.
0mg/cm2以下の塗布量で塗布されていることを特徴と
するフィールドエミッションディスプレイの蛍光膜。1. A structure having at least a field emission cathode and an anode facing the field emission cathode, and having a structure in which a fluorescent film provided on the anode side is excited by an electron beam with an accelerating voltage of about 0.1 to 2 kV to emit light. In the field emission display, the fluorescent film has a central particle diameter of 0.1 μm.
2. Phosphors of 4 μm or less are 0.2 mg / cm 2 or more, and 3.
A fluorescent film for a field emission display, which is applied at an application amount of 0 mg / cm 2 or less.
ppm以上、1500ppm以下の範囲で含有するZn
S:Ag,X(但しXはAl、ハロゲン元素の内の少なく
とも一種)蛍光体、または、Cuを母体に対し200p
pm以上、1500ppm以下の範囲で含有するZn
S:Cu,X(但しXはAl、ハロゲン元素の内の少なく
とも一種)蛍光体、またはAuを母体に対し200pp
m以上、1500ppm以下の範囲で含有するZnS:
Au,X蛍光体、またはCuを200ppm以上150
0ppm以下、およびAuを100ppm以上600p
pm以下含有するZnS:Cu,Au,X蛍光体、または
Euを母体に対し1%以上、10%以下の範囲で含有す
るY2O2S:Eu蛍光体、Y2O3:Eu蛍光体より選択
された少なくとも一種の蛍光体が塗布されてなることを
特徴とする請求項1に記載のフィールドエミッションデ
ィスプレイの蛍光膜。2. The fluorescent film contains Ag in an amount of 300 with respect to a matrix.
Zn contained in the range of 1 ppm or more and 1500 ppm or less
S: Ag, X (where X is Al, at least one of halogen elements) phosphor, or Cu with 200p to the host
Zn contained in the range of pm or more and 1500 ppm or less
S: Cu, X (where X is Al, at least one of halogen elements) phosphor, or Au to the base material at 200 pp
ZnS contained in the range of m to 1500 ppm:
Au, X phosphor or Cu 200ppm or more 150
0ppm or less and Au 100ppm or more 600p
ZnS: Cu, Au, X phosphor containing pm or less, or Y 2 O 2 S: Eu phosphor, Y 2 O 3 : Eu phosphor containing Eu in an amount of 1% or more and 10% or less with respect to the matrix. The phosphor film for a field emission display according to claim 1, wherein at least one phosphor selected from the above is applied.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8477592A JPH05251023A (en) | 1992-03-06 | 1992-03-06 | Phosphor screen of field emission display |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8477592A JPH05251023A (en) | 1992-03-06 | 1992-03-06 | Phosphor screen of field emission display |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05251023A true JPH05251023A (en) | 1993-09-28 |
Family
ID=13840057
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8477592A Pending JPH05251023A (en) | 1992-03-06 | 1992-03-06 | Phosphor screen of field emission display |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05251023A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07220666A (en) * | 1994-01-28 | 1995-08-18 | Futaba Corp | Field emission fluorescent character display device |
EP1860678A3 (en) * | 2006-05-19 | 2008-08-13 | Canon Kabushiki Kaisha | Image display apparatus and method of driving the same |
US7518304B2 (en) | 2003-10-31 | 2009-04-14 | Samsung Sdi Co., Ltd. | Flat panel display device |
US7994695B2 (en) | 2006-06-23 | 2011-08-09 | Thomson Licensing | Luminescent materials for a carbon nanotube (CNT) field emission device (FED) |
-
1992
- 1992-03-06 JP JP8477592A patent/JPH05251023A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07220666A (en) * | 1994-01-28 | 1995-08-18 | Futaba Corp | Field emission fluorescent character display device |
US7518304B2 (en) | 2003-10-31 | 2009-04-14 | Samsung Sdi Co., Ltd. | Flat panel display device |
EP1860678A3 (en) * | 2006-05-19 | 2008-08-13 | Canon Kabushiki Kaisha | Image display apparatus and method of driving the same |
US8188668B2 (en) | 2006-05-19 | 2012-05-29 | Canon Kabushiki Kaisha | Image display apparatus and method of driving the same |
US7994695B2 (en) | 2006-06-23 | 2011-08-09 | Thomson Licensing | Luminescent materials for a carbon nanotube (CNT) field emission device (FED) |
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