KR100381432B1 - The FED equipped with gear-type spacer - Google Patents

Abstract

The field emission display device having a spacer protruding in the form of a gear according to the present invention allows the lower end portion of the lip spacer to protrude in the form of a gear so as to be in point contact with the lower plate of the field emission display device.

Here, the lip spacer protrudes in a gear shape such that the upper end thereof is in point contact with the top plate of the field emission display device, and a metal is coated on the lower end of the lip spacer.

The lower plate is characterized in that a groove is formed at a point where the lower end of the lip spacer is located, and the groove is removed from the cathode electrode of the lower plate so that the glass substrate of the lower plate is exposed.

One or both sides of the lip-shaped spacer are manufactured in gear shape to make point contact with the cathode substrate or the anode substrate, thereby minimizing charge accumulation and discharge due to the triple bonding effect generated when the spacer and the substrate are in contact with each other. Can improve the efficiency.

In addition, by forming a groove in the negative electrode of the lower plate corresponding to the contact portion of the spacer can be eliminated the triple bonding effect without the need for metal coating the lower end of the spacer.

Description

FED equipped with gear-type spacer}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of spacers of field emission type display elements, and in particular, unlike conventional lip-shaped spacers, one or both sides are formed in gear shape to be brought into contact with the spacer by making point contact with the top or bottom plate. The present invention relates to a field emission display device having spacers protruding in the form of gears for easy exhaust and minimizing charge accumulation and discharge due to the triple junction effect.

With the development of multimedia, the interest and importance of displays, which play an important role, are increasing. In response to this, various flat-panel displays such as liquid crystal displays and plasma displays have been developed and put into practical use. However, from the viewpoints of viewing angle, high-speed response, high brightness, power consumption, and thinness, a display that has not been satisfied so far cannot be obtained. Except for the problem, the cathode ray tube (CRT) is the closest.

Recently, the field emission display, which is attracting attention as a next-generation display, uses phosphor emission by the same electron beam as the cathode ray tube, so that a flat display with low power consumption can be realized without distortion of the image while maintaining excellent characteristics of the cathode ray tube. Most likely.

(A) and (b) of FIG. 1 show the basic principle of a general field emission display device. The basic configuration is a three-pole tube like a conventional vacuum tube, but a sharp cathode without using a hot cathode. When the electric field is concentrated on the 100, that is, when the cathode electrode 140 of a predetermined line is set to the ground potential and a voltage of +100 V is applied to any one electrode 160 of the gate line, At the tip of the emitter tips 170 at the intersections of the electrodes, a cold cathode is used to form a high electric field and emit electrons by a quantum mechanical tunneling effect.

In this case, the voltage of the gate electrode 160 for emitting electrons decreases as the size of the gate hole 150 decreases, and depends on the material properties of the emitter tip 170.

Here, the cathode electrode 140 and the gate electrode 160 are electrically separated by the insulating layer 130, and each has a line shape in a horizontal or vertical direction and is formed to cross when viewed from above. 150 is formed and an emitter tip 170 is formed on the cathode electrode corresponding to each hole.

Here, by sequentially applying a voltage to the cathode electrodes and the gate electrodes, an electron beam is emitted from emitters at the intersections of the two electrodes to emit light to face each other, thereby enabling each pixel to emit light sequentially. . A high voltage of several kV or more is applied to the anode-coated electrode to accelerate the electrons emitted from the emitter to impinge on the corresponding phosphor.

The luminance and color implementation of the individual pixels may be controlled by using a principle in which the amount of current emitted by the voltage difference between the emitter electrode and the gate electrode is changed. Color control is possible by adjusting the luminance of three adjacent red, green, and black pixels.

2 is a cross-sectional view of a panel state of a conventional field emission display device, and includes a top plate 200 having a reflective protective film 201, a black matrix 202, a phosphor 203, and the like; A lower plate 210 having a getter 211, an insulator 212, an emitter tip 213, a cathode electrode 214, a gate electrode 215, and the like; A spacer 220; The frit 230 is provided.

Since the inside of the panel of the field emission display device must be maintained in a high vacuum, a spacer 220 is installed to maintain a gap between the upper plate 200 and the lower plate 210. Vacuum the inside. Typically, the field emission display has a lower high vacuum (~) than the cathode ray tube. This is because structures susceptible to vacuum discharge, such as emitter tips, are usually installed between upper and lower plates within 1 ~ 2mm.

Spacers are installed between the upper plate and the lower plate. This prevents the upper plate and the lower plate from being deformed due to the difference between the external atmospheric pressure and the pressure inside the field emission type internal vacuum display, and at the same time electrically protects the lower plate against the high voltage (10 kV) applied to the upper plate. Since it must be a material, it is usually installed using glass or ceramics.

However, a phenomenon in which the flow of the electron beam emitted from the cathode electrode 214 is distorted near the spacer due to the influence of the spacer provided. Although the spacer is made of an electrically insulator, electrons may be electrically charged by the collision or other influence with the spacer, thereby locally distorting the electric field distribution inside the field emission display device. This spacer charging event eventually leads to electrical arcing, which results in fatal defects in the field emission display internal elements.

Distortion of the electron flow around the spacers results in distortion of the displayed image. In particular, a dark or bright image can be observed on the screen around the spacers, so that the shape of the spacers can be seen on the screen. There is a disadvantage.

As a result, some attempts have been made to prevent spacer charging. For example, there are methods of coating the spacer surface or coating conductive electrode strips on the spacer surface to allow the charged charge to escape to the outside.

These methods not only make the structure of the spacer more complicated, but also have a disadvantage in that the field emission type display device is expensive because it is difficult to manufacture and requires an additional process.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is made of one or both sides of a lip-shaped spacer in the form of a gear to make contact with the upper plate or the lower plate by triple contact (triple) generated during contact with the spacer It is an object of the present invention to provide a field emission display device having spacers protruding in the form of gears that minimize charge accumulation or discharge phenomenon due to a junction effect and improve efficiency during vacuum evacuation.

1 is a diagram showing the basic principle of a general field emission display device.

2 is a cross-sectional view of a panel state of a conventional field emission display device.

3 is a view showing an embodiment of a field emission display device having a spacer protruding in the form of a gear according to the present invention.

4 is a view showing in detail the various gear-shaped spacer in the field emission display device having a spacer protruding in the form of a gear according to the present invention.

5 is a view showing an embodiment of installing a metal-coated spacer on the lower plate in the field emission display device having a spacer protruding in the form of a gear according to the present invention.

FIG. 6 is a view illustrating an embodiment in which a non-coated spacer is recessed and installed in a lower plate in a field emission display device having a spacer protruding in a gear shape according to the present invention.

Explanation of symbols on the main parts of the drawings

310: top plate 311: phosphor

320: bottom 321: emitter

330: Spacer

In order to achieve the above object, the field emission display device having a spacer protruding in the shape of a gear according to the present invention has a point where the lower end of the lip spacer protrudes in the shape of a gear so that the bottom contact of the field emission display device is in point contact. It is characterized by.

Here, the lip spacer is protruded in the form of a gear such that the upper end of the lip spacer in contact with the top plate of the field emission display device, characterized in that the metal coated on the lower end of the lip spacer.

The lower plate is characterized in that a groove is formed at a point where the lower end of the lip spacer is located, and the groove is characterized in that the cathode electrode of the lower plate is removed so that the glass substrate of the lower plate is exposed. .

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

3 is a view showing an embodiment of a field emission display device having a spacer protruding in the form of a gear according to the present invention.

Referring to FIG. 3, the shape of the spacer 330 contacting the upper plate 310 to which the phosphor 311 is applied and the lower plate 320 having the emitter 321 is in the shape of a gear, so that the lower plate and the spacer and It can be seen that the contact of can be approximated to the point contact.

In addition, since the surface area of the gear-shaped spacer 330 is less than 70% of the conventional bar-shaped spacer it can be seen that the surface charge accumulation can also be suppressed.

The area in contact with the upper plate 310 is completely contacted using the frit glass 312 as shown in FIG. 3B, but the contact with the lower plate is automatically supported by atmospheric pressure outside the upper and lower plates. It is.

4 is a view showing in detail the spacer of the various gear shape in the field emission display device having a spacer protruding in the gear shape according to the present invention.

Referring to Figure 4, first of Figure 4 (a) shows that only the lower end of the spacer in the form of a gear.

4 (b) and 4 (c) show that not only the lower end but also the upper end of the spacer is formed in a gear shape. Such spacers can reduce contact with the top or bottom of the field emission display device as much as possible. I can see that there is.

In addition, when the metal cutting is partially provided on the sharp point of the gear shape of the spacer, the triple bonding effect occurring at the top or bottom of the spacer and the top or bottom of the field emission display device can be suppressed.

FIG. 5 is a view illustrating an embodiment in which a metal-coated spacer is installed on a lower plate in a field emission display device having a spacer protruding in a gear shape according to the present invention.

Referring to FIG. 5, the upper end of the gear-shaped spacer 510 is in contact with the top plate 520 and the frit glass 521, and the lower end 511 of the spacer is coated with a metal to form a field emission display device. Since the point contact with the cathode electrode 531 of the lower plate 530 can reduce the surface electron emission as much as possible.

FIG. 6 is a view illustrating an embodiment in which a spacer not coated with a groove is installed in a lower plate in a field emission display device having a spacer protruding in a gear shape according to the present invention.

Referring to FIG. 6, the grooves 622 are formed such that the bottom glass contacts the metal layer, which is the cathode electrode 621 of the bottom plate 620 of the field emission display device, according to the size and shape of the lower end of the spacer 610 having a gear shape. In this case, the contact area between the spacer and the lower plate is made of glass so that no additional coating is required, and the spacer is fixed.

As described above, the field emission display device having a spacer protruding in the form of a gear according to the present invention has a contact with the spacer by making one or both sides of the lip-shaped spacer in the form of a gear to make point contact with the upper or lower plate. It is possible to minimize charge accumulation and discharge phenomenon due to the triple junction effect generated at the time and to improve efficiency during vacuum evacuation.

In addition, by forming a groove in the negative electrode of the lower plate corresponding to the contact portion of the spacer can be eliminated the triple bonding effect without the need for metal coating the lower end of the spacer.

Claims (5)

A field emission display device having a spacer projecting in the form of a gear, wherein the lower end of the lip spacer is protruded in gear form so as to be in point contact with the lower plate of the field emission display device. 2. The field emission display device as claimed in claim 1, wherein the lip spacer is protruded in the form of a gear such that the upper end thereof is in point contact with a top plate of the field emission display device. The field emission display device of claim 1, wherein a groove is formed at a point where the lower end of the lip spacer is positioned. The field emission display device of claim 1, wherein a metal is coated on a lower end of the lip spacer. The field emission type display device of claim 3, wherein the groove of the lower plate has a cathode electrode removed so that the glass substrate of the lower plate is exposed.