JPH05250984A - Manufacture of shield electrode for light emitting element - Google Patents

Abstract

PURPOSE:To provide a manufacturing method of a shield electrode for a light emitting element by which a shield electrode being one of internal electrodes for the light emitting element can be manufactured highly reliably at low cost. CONSTITUTION:A shied electrode is divided into a metallic plate 7a and reinforcing side plates 7b, and after mesh parts 8b are arranged in the metallic plate 7a by means of etching, both edge parts of this metallic plate 7a are bent, so that a pair of side plates 7b can be provided, and a pair of the other side plates 7c are welded to these. Thereby, the shield electrode can be manufactured highly reliably at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a shield electrode of a light emitting element for manufacturing a shield electrode inside the light emitting element for constituting a large screen display device used in, for example, a stadium or the like. .

[0002]

2. Description of the Related Art FIG. 5 is an external perspective view of a conventional light emitting device, and FIG. 6 is an exploded perspective view thereof. In FIGS. 5 and 6, 1a is a display plate, 9 is a phosphor of R, G, B applied in a matrix on the display plate 1a, 1b is a spacer having a rectangular frame shape, and 1c is an electrode or the like. Substrate, 1 is 1
It is a vacuum container composed of a, 1b and 1c.

Reference numeral 7 denotes a box-shaped shield electrode provided in the vacuum container 1, 8 denotes a plurality of openings provided on the upper surface of the shield electrode 7 so as to face the phosphor 9, and 8a extends to the opening 8. It is a mesh.

In the substrate 1c, 2 is a plurality of linear cathodes, 3 is a plurality of scan electrodes, 4 is a plurality of data electrodes, 5 and 6 are scan electrodes 3 and data electrodes 4 in the row or column direction, respectively. Wirings 10 commonly connected are exhaust holes.

FIG. 7 is a plan view showing details of the cathode 2, the scanning electrode 3, the data electrode 4, the wirings 5, 6 and the like on the substrate 1c. In FIG. 7, S _{1 to} S ₄ are commonly connected in the row direction. the lead portions of the scanning electrode 3, a lead-out portion of the D ₁ to D ₄ row direction to be connected to the common data electrode 4.

FIG. 8 shows each of the lead-out portions S _{1 to} S ₄ , D ₁
To D ₄ from the scan electrodes 3, a timing chart showing a signal applied to the data electrodes 4, 9 each lead portions S ₁ ~
Pixels P _{11 to} P corresponding to S ₄ , D _{1 to} D ₄ and the phosphor 9
₄₄ is a configuration diagram showing an arrangement relationship with _44, and FIG. 10 is a configuration diagram showing respective potentials of the scan electrode 3 and the data electrode 4 and a flow of electrons for explaining the operation. FIG. 11 is a side view when a plurality of light emitting elements are arranged.

Next, the operation will be described. The basic principle of this type of light emitting device is to accelerate thermoelectrons emitted from the cathode and collide with the anode to excite the phosphor coated on the anode surface to emit light. In FIG. 10, the thermoelectrons emitted from the cathode 2 are emitted from the scanning electrode 3.
And the potential of the data electrode 4 are combined, the following behavior occurs. Each of these will be described in association with FIG.

When both the scanning electrodes 3 connected in the row direction and the data electrodes 4 connected in the column direction are positive with respect to the cathode 2, the electrons emitted from the cathode 2 due to the positive potential of the data electrode 4 are It is deflected by the potential of 3 and passes through a predetermined opening 8 to reach the anode to cause the phosphor 9 to emit light.

When the scanning electrode 3 is positive and the data electrode 4 is negative: The negative potential of the data electrode 4 close to the cathode 2 makes the potential near the cathode 2 negative, and the emission of thermoelectrons is suppressed.
Therefore, the phosphor 9 does not emit light.

When the scan electrode 3 is negative and the data electrode 4 is positive, there are the following two cases. a. When the other scanning electrode 3 is positive: The thermoelectrons emitted from the cathode 2 are deflected to the other scanning electrode 3 side by the potential of the scanning electrode 3, and the phosphor 9 does not emit light. b. When the other scanning electrode 3 is also negative, the potential of the data electrode 4 is positive, but since the area of the data electrode 4 is small, the vicinity of the cathode 2 becomes negative due to the influence of the negative potential of the scanning electrodes 3 on both sides, and the thermoelectrons The phosphor 9 whose emission is suppressed does not emit light.

When both the scanning electrode 3 and the data electrode 4 are negative: The potential near the cathode 2 becomes negative, the emission of thermoelectrons is suppressed, and the phosphor 9 does not emit light.

As a result, from the relationship between the wiring shown in FIG. 7 and the arrangement of the pixels P _{11 to} P ₄₄ shown in FIG. The located phosphor 9 emits light. First, when a signal is applied to S ₁ , P _{11 to} P ₁₄ are selected, and these emit light according to the potentials of the data electrodes 4 (D _{1 to} D ₄ ). Then S
_When a signal is applied to ₂ , P _{21 to} P ₂₄ are selected, and light is also emitted according to the potential of the data electrode 4. As shown in FIG.
As shown in FIG. 3, by sequentially applying scanning signals to the scanning electrodes 3 and applying arbitrary data signals to the data electrodes 4, it becomes possible to obtain an arbitrary display.

[0013]

Since the conventional light emitting device is constructed as described above, the structure of the shield electrode 7 when extracting the thermoelectrons to the anode is complete except for the opening 8 with the mesh 8a. It was hermetically sealed in and it was necessary to prevent the leakage of thermoelectrons. The reason for this is that if thermoelectrons leak from other than the opening 8, the areas that should not shine will shine, causing a problem. For this reason, conventionally, the degree of tightness is emphasized so much that a metal plate is drawn into the shape shown in FIG.
Since the shield electrode 7 is manufactured by sticking a, there is a problem that it becomes very expensive. A method of forming a mesh on a single metal plate in advance by etching and then performing draw forming has been considered, but there were problems such as breaking the mesh during forming and degrading dimensional accuracy.

The present invention has been made in order to solve the above problems, and a light emitting element which can be manufactured at low cost without forming a shield electrode from a single metal plate with a die. It is an object of the present invention to obtain a method for manufacturing the shield electrode of.

[0015]

According to a first aspect of the invention, there is provided a method of manufacturing a shield electrode for a light emitting device, wherein a mesh portion is formed on one metal plate by etching, and then both end portions of the metal plate are bent. A box-shaped shield electrode is obtained by forming a pair of side plates facing each other and then welding another pair of side plates orthogonal to this pair of side plates.

According to a second aspect of the present invention, there is provided a method of manufacturing a shield electrode for a light emitting device, wherein a mesh portion is formed on one metal plate by etching, and then four side plates are welded to the metal plate to form a box. This is to obtain a shield electrode in the shape of a circle.

[0017]

In the method of manufacturing the shield electrode of the light emitting element according to the first aspect of the invention, the metal plate is not formed by drawing and both ends thereof are simply bent, so that the mesh is not broken and the thickness is suitable for etching. Since a thin metal plate can be used, the dimensional accuracy is good.

The method of manufacturing the shield electrode of the light emitting device according to the second aspect of the invention is easy to manufacture, and can be manufactured at low cost by selecting the material and thickness of the four side plates.

[0019]

【Example】

Example 1. An embodiment of the invention of claim 1 will be described below with reference to the drawings. In FIG. 1, first, one metal plate 7a is prepared, and a plurality of mesh portions 8b are formed on the metal plate 7a by etching. Next, both ends of the metal plate 7a provided with the mesh portion 8b are bent at a substantially right angle to form a pair of side plates 7b facing each other. Next, a pair of side plates 7c, which are separately prepared and made of a metal plate having a predetermined shape, are arranged in a direction orthogonal to the pair of side plates 7b, and the side plates 7c are welded by laser welding or electron beam welding. As a result, the shield electrode 7 as shown in FIG. 2 is obtained.

According to the above, since both ends of the metal plate 7a are only bent, there is almost no load on the mesh portion 8b and the mesh portion 8b is not broken. Also,
By using a relatively thin metal plate (about 0.1 mm) suitable for etching as the metal plate 7a, it is possible to shorten the etching time and obtain a metal plate having good dimensional accuracy.

The metal plate 7a and the side plate 7c do not necessarily have to have the same material and the same thickness. For example, the side plate 7c.
By using a cheap material and a thick material (about 0.2 mm), the thin metal plate 7a can be reinforced and an inexpensive material can be obtained.

Example 2. 3 and 4 show an embodiment of the invention of claim 2. In FIG. 3, first, one metal plate 7
d is prepared, and a plurality of mesh portions 8b are provided on the metal plate 7d by etching. Next, the separately prepared four side plates 7c and 7e each having a predetermined shape are arranged on the peripheral edge of the metal plate and welded to each other, whereby the shield electrode 7 shown in FIG. 4 can be obtained.

Also in the second embodiment, the materials and thicknesses of the metal plates 7d and the side plates 7c and 7e may be freely selected. A thin metal plate 7d is used, and the side plates 7c and 7e are inexpensive and thick. By using, it is possible to further increase the reinforcing strength and to manufacture at a lower cost.

[0024]

As described above, according to the invention of claim 1, after the mesh portion is provided on the metal plate by etching,
Both ends of this metal plate are bent to form a pair of side plates, and another pair of side plates separately prepared in a direction orthogonal to the pair of side plates is configured to be welded. There is an effect that a shield electrode that can be reliably formed and has high dimensional accuracy can be obtained at low cost.

Further, according to the invention of claim 2, after the mesh portion is formed on the metal plate by etching, four side plates are arranged on the periphery of the metal plate and welded to each other. There is an effect that a large shield electrode can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a method of manufacturing a shield electrode of a light emitting device according to an embodiment of the present invention.

FIG. 2 is an external perspective view showing a shield electrode obtained by the same manufacturing method.

FIG. 3 is an exploded perspective view showing a method of manufacturing a shield electrode of a light emitting device according to an embodiment of the present invention.

FIG. 4 is an external perspective view showing a shield electrode obtained by the same manufacturing method.

FIG. 5 is an external perspective view showing a conventional light emitting device.

FIG. 6 is an exploded perspective view showing the light emitting device.

FIG. 7 is a plan view showing a substrate of the light emitting device.

FIG. 8 is a timing chart showing a signal applied to each electrode in the light emitting device.

FIG. 9 is a configuration diagram showing an arrangement relationship between pixels and electrodes in the same light emitting element.

FIG. 10 is a configuration diagram showing an operation of the light emitting element.

FIG. 11 is a side view showing a state in which a plurality of light emitting devices are arranged.

[Explanation of symbols]

 7a, 7d Metal plate 7b, 7c, 7e Side plate 8b Mesh part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsumasa Umezaki 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Material Device Research Center (72) Inventor Mitsuo Inumochi 8-1-1 Tsukaguchihonmachi, Amagasaki (72) Inventor, Kazunori Tatsuta, 700, Wada, Ueno-machi, Ise-shi, Mie, Ise Electronics Industry Co., Ltd. (72) Yuji Kamogawa, 700, Wada, Ueno-cho, Ise-shi, Mie, Ise Electronics Industrial Co., Ltd. (72) Inventor Tokuhide Shimojo 700 Wada, Ueno Town, Ise City, Mie Prefecture Ise Electronic Industry Co., Ltd.

Claims (2)

[Claims] 1. A metal plate is provided with a plurality of mesh portions by etching, both ends of the metal plate are bent to form a pair of side plates, and another pair of side plates orthogonal to the pair of side plates are welded. Of manufacturing a shield electrode for a light emitting device. 2. A method of manufacturing a shield electrode for a light emitting device, comprising: forming a plurality of mesh portions on a metal plate by etching; then disposing four side plates on the periphery of the metal plate and welding them together.