KR100278439B1 - Field emission indicator - Google Patents

Abstract

The present invention relates to a field emission display device that is easy to manufacture by forming a gate electrode for electron focusing on an upper panel and to suppress generation of crosstalk. Unlike the conventional field emission display device, the gate and focusing electrodes which focus electrons emitted from the emitter to the phosphor layer are formed on the upper panel, thereby increasing the height uniformity of the plurality of emitters formed on the lower panel. It is possible to precisely adjust, to easily realize the manufacture of the entire display element, and also to form a gate and focusing electrode that focuses the electrons emitted from the actor close to the emitter side, thereby reducing the image quality due to focusing (focusing) error. It is possible to reliably prevent the phenomenon.

Description

FIELD EMISSION DISPLAY DEVICE

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a flat panel display device, and more particularly to a field emission display, which requires high vacuum packaging and which accelerates electrons generated by using an electric field to collide with an RGB phosphor, thereby displaying a desired color display screen. FIELD EMISSION DISPLAY: FED.

In recent years, field emission display devices (FEDs) according to the present invention, followed by PDPs and LCDs, represent flat panel display devices, and technology development and commercialization have been actively conducted everywhere.

A partial cross-sectional view of a typical example of the field emission display device according to the present invention among the above flat panel display elements is shown in FIG. 3.

Referring to FIG. 3, a lower substrate 302 and a cathode electrode layer 304 are sequentially formed on the lower panel positioned on the rear side of the viewer, and are formed in a conical shape on the lower substrate 302 to emit electrons by generation of an electric field. A plurality of emitters 306 are formed. In addition, an integral insulator layer 308 is formed between the emitters 306 so as to enclose each of these emitters, and a gate electrode layer 310 is formed on the insulator layer 308. Here, each emitter 306 is formed of a silicon tip or a metal tip.

In addition, on the upper panel, a phosphor layer 314, an anode electrode layer 316, and an upper layer that emit light when electrons generated in each emitter 306 impinge on the surface with a space 312 maintaining a high vacuum state therebetween. The substrate 318 is formed sequentially.

On the other hand, each of the conical emitters 306 formed on the lower substrate 302, as shown in FIG. 4, for example, a hole 320 having a diameter of about 1 to 2 μm in the gate electrode layer 310, for example. ) Are formed in each hole 320 through a deposition process.

Therefore, the conventional field emission display device has a problem in that the manufacturing process is difficult because the deposition process for forming conical emitters that generate electrons requires very high precision due to its structural characteristics. That is, each emitter must emit a uniform current, which must be formed so that each emitter has a uniform height.

However, when the emitters are formed in each hole through a deposition process, it is very difficult to maintain the height uniformity with high accuracy. Therefore, in the conventional field emission display device employing conical emitters, there is a limitation in achieving a uniform emission luminance level. Had no choice but to have.

In addition, the conventional field emission display device has a problem in that the image quality is deteriorated because the distance between the anode electrode layer and the gate electrode layer is too far, so that full focusing (focusing) on the emitted electrons is difficult, affecting the adjacent unit cells. .

Accordingly, the present invention is to solve the above problems of the prior art, to provide a field emission display device that is easy to manufacture by suppressing the focusing error by forming a gate electrode for electron focusing on the upper panel. Its purpose is to.

In order to achieve the above object, the present invention provides a field emission display device comprising a lower panel having a plurality of electron emission emitters and an upper panel facing the lower panel with a high vacuum space therebetween. A lower substrate; A cathode electrode layer formed on the lower substrate; And a plurality of emitters formed at regular intervals on the cathode electrode layer, wherein the upper panel comprises: an upper substrate; An anode electrode layer formed on the upper substrate; A phosphor layer formed on the anode electrode layer and patterned by unit cells and arranged at regular intervals; An insulator layer adjacent to the phosphor layer and extending by a predetermined height toward the lower panel on the exposed anode electrode layer; And it provides a field emission display device comprising a gate electrode layer formed on the insulator layer.

1 is a partial cross-sectional view of a field emission display device cut in a vertical direction according to a preferred embodiment of the present invention;

2 is a partial plan view of an upper panel made in accordance with the present invention;

3 is a partial cross-sectional view of a conventional typical field emission display device cut in a vertical direction;

4 is a partial plan view of a lower substrate employed in a conventional field emission display device.

<Description of the code | symbol about the principal part of drawing>

102 lower substrate 104 cathode electrode layer

106 emitter 108 space

110: phosphor layer 112: insulator layer

114: gate electrode layer 116: anode electrode layer

118: upper substrate

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

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

First, a key technical aspect of the present invention is to form a gate and a focusing electrode on the upper panel, unlike the conventional field emission display device which forms the gate electrode on the lower panel. Can easily be achieved.

1 is a partial cross-sectional view of a field emission display device cut in a vertical direction according to a preferred embodiment of the present invention.

Referring to FIG. 1, the lower panel employed in the field emission display device according to the present invention is different from the conventional field emission display device in which the lower panel includes a lower substrate, a cathode electrode, a plurality of emitters, an insulator layer, and a gate electrode layer. Alternatively, it only includes the lower substrate 102, the cathode electrode layer 104, and the plurality of emitters 106.

The lower panel having the structure as described above employed in the field emission display device of the present invention deposits a cathode electrode on the lower substrate 102 through a deposition process, and again on the cathode electrode layer 104 through a deposition or thin film coating process. This is accomplished by forming a plurality of conical emitters 106 at. In this case, the emitter 106 may be formed through a deposition process when employing a silicon tip or a metal tip, and may be formed through a thin film coating process when employing a DLC (Diamond Like Carbon) tip.

Thus, the lower panel employed in the present invention, unlike the aforementioned conventional method of digging a plurality of holes in the gate electrode and forming emitters in each hole formed through a deposition process, emitters directly on the cathode electrode layer 104. Because they form 106, they are not only easy to manufacture, but also have the advantage of being able to precisely control the height uniformity of the formed emitters 106.

Meanwhile, the upper panel employed in the field emission display device of the present invention has a space 108 for maintaining a high vacuum state between the lower panel and the phosphor layer 110, the insulator layer 112, and the gate electrode layer 114. ), The anode electrode layer 116 and the upper substrate 118.

That is, the insulator layer 112 is formed on the phosphor layer 110 at regular intervals and extends by a predetermined length in the lower direction (that is, the space 108 side direction), and the gate electrode layer is formed on the insulator layer 112. 114 is formed. In addition, an anode electrode layer 116 made of a transparent material and an upper substrate 118 are sequentially formed on the phosphor layer 110.

Therefore, when the top panel according to the present invention having the structure as described above is viewed in plan from the gate electrode layer 114 side, as shown in FIG. 2 as an example, the phosphor layer 110 forming each unit cell RGB is formed. The gate electrode layer 114 formed on the insulator layer protruding at a predetermined height is surrounded by a substantially square shape.

The upper panel having the structure as described above sequentially forms the upper substrate 118, the anode electrode layer 116, and the phosphor layer 110, and patterns the phosphor layer 110 to expose a portion of the anode electrode layer 116. In addition, the insulating material and the electrode material are sequentially deposited on the exposed portion of the anode layer 116 and the phosphor layer 110 by a predetermined thickness, and a portion of the sequentially deposited electrode material and the insulating material is etched to insulate the insulator layer 112 and the gate. The electrode layer 114 may be manufactured through a process of forming the electrode layer 114.

In addition, the field emission display device of the present invention is formed by protruding the gate electrode layer 114 from the phosphor layer 110 of the upper panel by a predetermined length in the direction of the space 108 to emit from the emitter 106 on the lower panel. It is very easy to focus the electrons to be made, that is, through the full focusing of the emitted electrons, it is possible to effectively suppress the phenomenon that the image quality is degraded due to the focusing error.

As described above, according to the present invention, unlike the conventional field emission display device, a gate electrode is formed on the upper panel to form a gate electrode that focuses electrons emitted from each emitter on the lower panel to guide the phosphor layer. It is possible to precisely adjust the height uniformity of the plurality of emitters formed on the surface, to simplify the manufacture of the entire display element, and to form a gate and a focusing electrode that focus electrons emitted from the emitter close to the emitter side. This can reliably prevent the phenomenon of deterioration in image quality due to focusing (focusing) error.

Claims (1)

A field emission display device comprising a lower panel having a plurality of electron emission emitters and an upper panel facing the lower panel with a high vacuum space therebetween, The lower panel is: Lower substrate; A cathode electrode layer formed on the lower substrate; And A plurality of emitters formed at regular intervals on the cathode electrode layer, The top panel is: An upper substrate; An anode electrode layer formed on the upper substrate; A phosphor layer formed on the anode electrode layer and patterned by unit cells and arranged at regular intervals; An insulator layer adjacent to the phosphor layer and extending by a predetermined height toward the lower panel on the exposed anode electrode layer; And And a gate electrode layer formed on the insulator layer.