JPH0754914Y2 - Field emission emitter light emitting device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field emission emitter light emitting element, and more particularly to a field emission emitter light emitting element using a field emission element having a cone-shaped emitter and a gate provided in the vicinity of the emitter as an electron source. It is abbreviated as FED.).

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing an example of a conventional fluorescent display tube 100 using a field emission device. The envelope 101 of the fluorescent display tube 100 includes a cathode substrate 1 facing each other.
02 and the anode substrate 103 are sealed together via a spacer 104. A field emission device is provided on the inner surface of the cathode substrate 102, and an anode electrode as a display unit having a phosphor layer is provided on the inner surface of the anode substrate 103 so as to face the field emission device. In the above structure, the field emission device and the anode electrode are as close to each other as possible, and the distance between them is, for example, about 0.2 mm. Therefore, the thickness of the spacer 104 is generally set to 1 mm or less, and the fluorescent display tube 100 is a thin display element. However, in the conventional getter 105, as shown in the figure, Ba-Al is placed in an annular metal container having an opening.
The getter material is a scattering type getter filled with a getter material such as, and has a thickness of about several mm. Therefore, conventionally, the getter 105 cannot be arranged in the envelope 101,
As shown in FIG. 6, a box-shaped getter chamber 106 is provided on the back surface of the cathode substrate 102 of the envelope 101, and the inside of the envelope 101 is electrically connected to the exhaust hole 107, and the getter 105 is provided in the getter chamber 106. It was Then, the air in the envelope 101 and the getter chamber 106 is exhausted through the exhaust hole 108 and the exhaust pipe 109 provided in the getter chamber 106, and then the exhaust pipe 109 is sealed so that the inside of the envelope 101 is closed. Are maintained in a high vacuum atmosphere. Then, the getter 105 is heated at high frequency by a bomber, and the getter material is deposited on the inner surface of the getter chamber 106 to form a getter film 110.

[0003]

[Problems to be Solved by the Invention] The above-mentioned conventional FED
According to him, there were the following problems. (1) The getter chamber must be provided outside the thin envelope. Moreover, if there is no distance between the getter and the inner surface of the getter chamber, the vapor deposition area of the getter film becomes small and the adsorption efficiency deteriorates. For this reason, the size of the getter chamber must be large. (2) The scattered Ba-Al getter is heated to a high temperature of about 850 ° C. by a high-frequency heating device to scatter only Ba metal. Therefore, when the getter and the substrate are close to each other, heat is transferred to the envelope, and partial thermal expansion occurs to cause cracks in the envelope.

The present invention makes it possible to take advantage of the thinness of the FED by eliminating the need for a getter chamber, and to eliminate the adverse effects of high temperature heating conventionally performed to form a getter film. It is intended to be provided.

[0005]

SUMMARY OF THE INVENTION A field emission emitter light emitting device of the present invention comprises a back plate facing each other at a predetermined distance and a rectangular envelope formed by sealing the periphery of a face plate, and the back plate. In a field emission emitter light-emitting device having a field emission device having a cone-shaped emitter and a gate provided on the inner surface and an anode having a phosphor layer provided on the inner surface of the face plate, a corner of the envelope is provided. A concave portion communicating with the space in which the field emission device and the anode are accommodated is provided in the portion, and a surface-active bulk getter is held inside the concave portion.

According to the present invention, in the field emission emitter light emitting device, the surface-active bulk getter may be mainly composed of Zr-Ni powder.

[0007]

[0008]

The surface-active bulk getter fixed inside the envelope has a getter function because the surface is activated by heating at a relatively low temperature. Since this bulk getter is close to the display part inside the envelope, the getter effect works effectively.

[0009]

EXAMPLE A first example will be described with reference to FIGS.
The getter used in this example is not a conventional scattered getter but a surface-active bulk getter (bulk getter). The surface active type bulk getter 1 according to the present embodiment (hereinafter simply referred to as bulk getter 1) is made of Zr-Ni powder having a material thickness of 0.1 to 0.2 mm.
Is formed into a square shape or a ribbon shape. The bulk getter 1 has a vacuum of 200 to 400 ° C.
By heating to a certain degree, the surface is activated and a getter function is obtained.

As shown in FIGS. 1 to 3, the fluorescent display tube 2 of this embodiment is an FED, and a face plate 3 and a back plate 4 facing each other at a predetermined interval are integrally formed with a side seal 5 therebetween. It has a fixed envelope 6. Although not shown, on the inner surface of the back plate 4, a field emission device including a cathode wiring, a cone-shaped emitter, an insulating layer, a gate, etc. is formed. Although not shown, on the inner surface of the face plate 3, an anode including an anode wiring, an anode conductor, a phosphor layer, and the like is formed.

The side seal 5 for sealing the back plate 4 and the face plate 3 is made of a glass adhesive material having a low melting point glass as a main component and is formed in a frame-shaped pattern having a predetermined thickness. At the four corners, a getter chamber 7 is formed in a shape matching the bulk getter 1 and communicating with the internal space of the envelope 6, and the plate-shaped bulk getter 1 described above is stored and held therein. ing. The thickness of the bulk getter 1 is smaller than the height of the getter chamber 7, and the surface of the bulk getter 1 is exposed in the space inside the envelope 6. That is, in this embodiment, the getter chamber 7 is a recess for accommodating the bulk getter 1 at a predetermined position in the envelope 6.

Next, the manufacturing process will be described. The side seal 5 is printed on the back plate 4 with the above-described pattern and a predetermined thickness by using a screen printing method.
The bulk getter 1 is placed in the getter chamber 7, and the face plate 3 is overlaid. Then, this is fired to seal the back plate 4 and the face plate 3 to form the envelope 6.

Next, the exhaust hole 8 provided in the back plate 4
Then, the inside of the envelope 6 is evacuated to a vacuum, and the exhaust hole 8 is sealed by the lid member 9. In this exhaust step, the envelope 6 is heated from the surroundings at a temperature of 250 to 350 ° C. in order to improve the exhaust efficiency. By this heating, the surface of the bulk getter 1 is activated and the getter action is increased.

As the getter material, the above-mentioned Z
In addition to r-Ni powder, Ta, Ti, Th, Nb, Ce and the like can be used, and a plate-shaped material of these materials may be used.

A second embodiment will be described with reference to FIG. In this embodiment, the getter chamber 10 in which the bulk getter 1 having a thickness of 0.1 mm is mounted is configured by using the spacer 11 made of photosensitive glass. The spacer 11 made of photosensitive glass is a square frame-shaped member having a thickness of 0.2 mm. At the four corners, recesses to be the getter chambers 10 are formed by using a photolithography technique. The shape, structure, dimensions, etc. of the getter chamber 10 are almost the same as those of the getter chamber 7 of the first embodiment, that is, the getter chamber 10 which is slightly larger than the bulk getter 1 communicates with the inside of the envelope 12.

A seal glass 14 is provided around the spacer 11 fixed on the back plate 13 via an adhesive glass. An adhesive glass 15 for fixing is also provided on the upper surface of the spacer 11. And
The bulk getter 1 is housed in the getter chamber 10, and the face plate is sealed to face the back plate 13 to form the envelope 12. The steps of exhausting / sealing the envelope 12 and activating the bulk getter 1 are the same as in the first embodiment.

In each of the embodiments described above, the getter chambers 7 and 10 communicating with the spaces inside the envelopes 6 and 12 are provided in the envelopes 6 and 12 as recesses for accommodating the bulk getter 1. As a structure in which such a getter chamber is provided in the envelope, as shown in FIG. 5 in addition to the above, the substrate 20 constituting the envelope is provided with a recess serving as the getter chamber 21 to accommodate the bulk getter 1. However, the bulk getter 1 may be held in the getter chamber 21 by a lid 22 having a hole.

Alternatively, the bulk getter may be directly fixed to a key portion in the envelope, that is, to the recess by using a glass adhesive as a mounting means.

[0019]

The fluorescent display of the present invention has the following effects because the bulk getter is directly fixed inside the envelope. (1) The bulk getter can be activated only by heating to a temperature of about 200 to 400 ° C. in vacuum. Therefore, the conventional high-frequency heating device becomes unnecessary, the getter flash step can be omitted, and the getter can be activated at the same time in the exhaust step.

(2) It is not necessary to provide an independent external getter chamber in the FED, and a thin fluorescent display tube can be manufactured.

(3) The structure for simplifying the structure is eliminated by eliminating the need for a conventional member for supporting the scattered getter, a metal container capable of high-frequency heating, and the like.

(4) Since the bulk getter is close to the display section, the getter effect works effectively.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a first embodiment.

FIG. 2 is an enlarged perspective view of a portion A of FIG.

FIG. 3 is a sectional view of the first embodiment.

FIG. 4 is a sectional view of a second embodiment.

FIG. 5 is an enlarged cross-sectional view of a main part of another embodiment.

FIG. 6 is a cross-sectional view of a conventional fluorescent display tube.

[Explanation of symbols]

 1 surface active type bulk getter (bulk getter) 2 fluorescent display tube 6,12 envelope 7,21 getter chamber as mounting means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Mikio Yokoyama 629 Futaba Electronics Co., Ltd., Mobara City, Chiba Prefecture (72) Creator Takeshi Tonegawa 629 Oshiba Oshiba, Mobara City, Chiba (72) Company Inventor Takehiro Niiyama 629 Oshiba, Mobara-shi, Chiba In Futaba Electronics Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. Backplays that face each other at a predetermined interval.
The outside of the rectangle with the periphery of the box and face plate sealed
Envelope and cone provided on the inner surface of the back plate
A field emission device having a shaped emitter and a gate;
Has a phosphor layer provided on the inner surface of the face plate
Field emission emitter light emitting device with anode
The field emission device and the anode at the corner of the envelope.
The inside of the recess is provided with a recess communicating with the space in which
A field emission emitter light-emitting device, characterized in that a surface-active bulk getter is held on . 2. The field emission emitter light emitting device according to claim 1, wherein the surface-active bulk getter is mainly composed of Zr—Ni powder.