KR200161503Y1 - Getter structure of fed - Google Patents

Abstract

In the present invention, a thin non-evaporable getter is used to keep the inside of the FED in a vacuum state, thereby preventing the FED from becoming thick and also supporting the aforementioned non-evaporable getter outside the display area instead of forming a spacer in the display area. Install a metal or ceramic to replace it with a spacer.

Description

FED Getter Formation Structure

Figure 1a is a schematic plan view of the subject innovation FED with a getter disposed.

FIG. 1B is a cross-sectional view for explaining a portion of FIG. 1A. FIG.

* Explanation of symbols for main parts of the drawings

1: non-evaporable getter 2: nichrome plate

3: metal or ceramic 4: sealing material

5: display area 6: top plate

7: bottom plate

The present invention relates to a structure for forming a getter in the FED, and more particularly, to a structure for forming a getter using a non-evaporable getter.

In general, the FED applies a high electric field (about 5 × 10 ⁷ V / cm) to a predetermined metal or silicon having a tip shape in a vacuum to emit electrons from the tip on the bottom plate, thereby forming a fluorescent layer formed on the top plate. A display device that displays an image by emitting light.

The space between the top and bottom of the FED is made high vacuum in order to maximize the activity of the electrons emitted from the cathode, and this high vacuum is achieved by the getter. These kinds of getters are largely divided into evaporative getters and non-evaporable getters. Since the use of the evaporable getter has a high calorific value and a lot of thickness to be formed inside the FED, there is a disadvantage in that the FED becomes thick as a whole. Recently, a technique for forming a getter body in a device using a thin film type non-evaporable getter has been developed. Coming.

In the present invention, a thin non-evaporable getter is used to keep the inside of the FED in a vacuum state, thereby preventing the FED from becoming thick and also supporting the aforementioned non-evaporable getter outside the display area instead of forming a spacer in the display area. It is to provide a FED forming structure that can be replaced with a spacer by installing a metal or ceramic to make it.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1A is a schematic plan view of the present invention FED in which a getter is disposed, and FIG. 1B is a cross-sectional view for explaining a part of FIG. 1A.

As shown, the FED generally includes a sealant which seals between the upper plate 6 on which the phosphor is applied, the lower plate 7 on which the field emission tip is formed, the display area 5, the upper plate 6 and the lower plate 7 ( 4) As shown in FIG. 1B, in the present invention, a non-evaporable getter 1 of about 0.1 mm is coated on a nichrome plate 2 of about 0.02 mm, and both ends of the nichrome plate 2 are about 0.2 mm thick and have thermal conductivity. The lower predetermined metal or ceramic 3 is combined with each other and placed in the upper and lower corners outside the display area 5. High frequency heating is performed to activate the non-evaporable getter 1 arranged as described above to make the inside of the FED into a vacuum state. In this case, the temperature of the getter activated is usually 600 ° C. or higher, and when the getter is activated, the ambient temperature increases due to its own exothermic reaction. Thus, cracks occur in a portion of the upper plate 6 or the lower plate 7 made of glass. Have the potential to be In order to solve this problem, the present invention forms a nichrome plate 2 between the metal or ceramic 3 having low thermal conductivity as described above, and coats the non-evaporable getter 1 on the high frequency heating or the getter itself. The upper plate 6 or the lower plate 7 is prevented from being directly heated by dispersing heat due to the exothermic reaction.

In addition, instead of forming a spacer in the display area 5, a simple alignment is performed by installing a metal or ceramic 3 supporting the above-mentioned non-evaporable getter 1 outside the display area 5 and replacing it with a spacer. There is an advantage that the spacer can be easily installed by the process.

The present invention can increase the size of the display area of the FED to the extent that the support role of the spacer can be provided, and a plurality of getter formations can be arranged at the periphery outside the display area to further improve the degree of vacuum.

Claims (2)

In forming the getter inside the FED, a non-evaporable getter 1 is coated on the nichrome plate 2 supported by the metal or ceramic 3 in the area between the outside of the display area 5 and the sealant 4. FED getter formation structure, characterized in that forming. The getter formation structure according to claim 1, wherein the metal or ceramic (3) is formed to function as a spacer.