KR100511259B1 - Ground electrode structure of fed panel - Google Patents

Abstract

The present invention relates to a ground electrode structure of a FDP panel, and a spacer for maintaining a gap between the rear glass and the anode plate, the FDP panel having a ground electrode is provided on the lower side of the spacer, on the rear glass The ground electrodes may be separately formed on the upper surfaces of the plurality of wiring lines, respectively, so as to prevent short circuits between the wiring lines, and the lower ends of the spacers may be contacted and supported on the upper surfaces of the respective ground electrodes. As a result, when the ground electrode contacts the wiring line, the ground electrode is not in contact with other wiring lines, thereby preventing occurrence of signal disturbance due to a short circuit, and excluding the buffer layer which is essentially used to prevent contact between the ground electrode and the wiring line. By doing so, the manufacturing cost and productivity are improved according to the labor savings.

Description

Ground electrode structure of FD panel {GROUND ELECTRODE STRUCTURE OF FED PANEL}

The present invention relates to a ground electrode structure of a FDP panel, and in particular, to prevent signal disturbance caused by the short of the ground electrode and the wiring line installed at the lower end of the spacer, and the FD panel which does not need a separate buffer layer. It relates to a ground electrode structure.

With the rapid development of information and communication technology and the demand for visualization of diversified information, the demand for electronic displays is increasing and the required display forms are also diversified.

For example, in an environment where mobility is emphasized, such as a portable information device, a display having a small weight, volume, and power consumption is required, and when used as an information medium for the public, display characteristics of a large viewing angle are required. In addition, in order to satisfy such demands, electronic displays require conditions such as large size, low price, high performance, high resolution, thinness, and light weight, so that a light and thin flat panel display that can replace the existing CRT is required to satisfy these requirements. The development of the device is urgently needed.

CRT, which currently occupies most of information display media, has excellent performance, but the larger the screen, the larger the volume and weight, and the problems such as high voltage and high power consumption.

Accordingly, the development of flat panel displays to replace such CRTs is actively underway. Currently, LCD, PDP, and VFD have been commercialized, and FED has attracted attention as a next-generation flat panel display for overcoming all these displays. I am getting it.

In particular, the field emission device (FED) has a simple electrode structure, high-speed operation based on the same principle as the CRT, full color, full gray scale, high luminance, It has all the advantages that a display should have, such as a high video rate rate.

1 is a schematic cross-sectional view of a FED panel to which a conventional micro-tip field emission device is applied, and FIG. 2 is an enlarged cross-sectional view of part A of FIG. 1, and as shown therein, an anode plate 1 and a cathode plate ( Cathode plates (2) are provided on the upper and lower sides at regular intervals to form vacuum gaps (3), and the gap between the anode plate (1) and the cathode plate (2) Spacers 4 are provided to hold 3).

In addition, the anode plate 1 has a black matrix 6, a phosphor 7, and an anode electrode 8 in order to increase contrast on the inner surface of the front plate 5. The ground electrode 9 is formed below the spacer 4.

 The cathode plate 2 has a cathode electrode 12 formed on an upper surface of the substrate 11, and an emitter 13, which is an electron emission source, is formed on an upper surface of the cathode electrode 12. .

In addition, a gate electrode 14 having a gate 14a for drawing electrons generated from the emitter 13 is formed above the cathode electrode 12, and the gate electrode 14 and the cathode are formed. The electrode 12 is insulated by a gate insulator 15.

A focusing electrode 16 for focusing electrons is provided above the gate electrode 14, and the focusing electrode 16 and the gate electrode 14 are insulated by a focusing insulator 17.

In the field emission device installed as described above, when a sufficient voltage is applied to both ends of the gate electrode 14 and the cathode electrode 12, a strong electric field is formed thereby, and the quantum is emitted from the emitter 13 by the electric field thus formed. Electrons are emitted by the mechanical tunneling phenomenon. The emitted electrons pass through the gate 14a of the gate electrode 14, and a field emitter array (FEA) is formed through matrix gates through the gate electrode 14 and the cathode electrode 12. The electrons are emitted during the time when the voltage is applied to the gate electrode 14.

The electrons emitted and accelerated as described above collide and emit light with high energy at a pixel of the phosphor 7 positioned on the rear side of the upper anode electrode 8, and are arranged in matrix R (red) and G (green). ), A color display is realized by phosphor dots of B (blue).

However, in the conventional FED panel as described above, a conductive thin film (not shown) is deposited on the side of the spacer 4 to prevent distortion of the parallel electric field due to the characteristics of the generated electron beam. In order to prevent the occurrence of arcing due to the concentration of the electric field generated by the micro-gap between the spacer 4 and the cathode plate 2, and to provide a path through which charged particles can escape, the ground electrode ( 9) must be installed as an essential part. In the assembly of the panel, the insulating layer is damaged by the pressure of the spacer 4 and the ground electrode 9 and the wiring layer are in contact with each other to generate a signal disturbance.

As a method for solving the above problems, a method of forming a buffer layer made of polyimide for buffering and supporting the ground electrode 9 on the upper surface of the cathode plate 2 is known. A separate process has to be added, and the electrons collide with the buffer layer during operation of the device, and organic gas is generated, thereby increasing the internal pressure of the panel.

The object of the present invention devised in view of the above problems is that it does not need a separate buffer layer in the installation of the ground electrode on the lower side of the spacer, suitable for preventing the signal disturbance caused by contact with the wiring lines It is to provide a ground electrode structure of the FD panel.

In order to achieve the object of the present invention constituted as described above, the present invention, in the FD panel is provided with a spacer for maintaining the gap between the rear glass and the anode plate, the ground electrode is provided below the spacer, The ground electrodes are separately formed on the top surface of the plurality of wiring lines respectively separated on the rear glass so as to prevent a short circuit between the wiring lines, and the lower end of the spacer is contacted and supported on the top surface of each ground electrode. A ground electrode structure of an FDP panel is provided. In this case, the distance between the ground electrodes is We, the distance between the ground electrodes is Ge, the distance between the wiring lines is W _d , and the distance between the wiring lines is G _d . if, It is preferable that a ground electrode is formed so that We = W _d and a relationship of G _d > We-Ge >

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Hereinafter, the ground electrode structure of the FDP panel of the present invention configured as described above will be described in detail with reference to embodiments of the accompanying drawings.

3 is a schematic cross-sectional view of a MIM type FED panel having a ground electrode structure according to the present invention, FIG. 4 is an enlarged cross-sectional view of a field emission device according to the present invention, and FIG. 5 is a view of a panel in which the ground electrode according to the present invention is installed in a spacer. Side cross section view.

As shown, the upper anode plate 101 and the lower cathode plate 102 are arranged at regular intervals, and the inside is vacuumed at the edge between the anode plate 101 and the cathode plate 102. Sealing material 103 is provided to seal the material so that it can be maintained in the interior of the anode plate 101 and the cathode plate 102 in which the sealing material 103 is installed, the anode plate 101 and the cathode plate 102 are provided. The spacer 104 is installed so that a constant interval can be maintained at all times.

The anode plate 101 has a structure in which a phosphor 112 is formed on an inner surface of the windshield 111 having a predetermined area.

In addition, the cathode plate 102 includes a first buffer layer 202 and a second buffer layer 203 formed on the upper surface of the rear glass 201, and a lower electrode 204 formed on the upper surface of the second buffer layer 203. ), The tunnel insulating film 205 formed on the upper surface of the lower electrode 204, the field insulating film 206 formed on the outer side of the tunnel insulating film 205, and the upper surface of the tunnel insulating film 205. An upper electrode 207, an upper electrode bus 208 formed outside the upper electrode 207, and an overhang insulating film 209 and a top electrode 210 sequentially formed on the upper electrode bus 208. MIM (metal-insulator-metal) field emission devices 211 are formed, and when the electric field is applied to the upper electrode 207 and the lower electrode 204, electrons in the tunnel insulating film 205 are formed on the upper phosphor ( 112).

In addition, the lower side of the spacer 104 installed between the anode plate 101 and the cathode plate 102 is arcing due to the concentration of an electric field generated due to the fine spacing between the spacer 104 and the cathode plate 102. The ground electrode 301 is provided to suppress the occurrence of the charge and to be a path through which the charged particles can escape. The ground electrode 301 is installed in the upper portion of the wiring line 302 formed on the cathode plate 102. The plurality is formed side by side with a predetermined interval so that each is located separately.

As described above, the ground electrodes 301 formed independently of each other are preferably assembled on the upper portion of the wiring line 302 so as to have a 1: 1 correspondence. The spacer 104 formed is aligned with the cathode plate 102 and assembled.

As described above, when the spacer 104 is aligned and assembled to the cathode plate 102, the ground electrode 301 and the wiring line 302 may be formed to meet the following conditions.

We is the distance between ground electrodes, Ge is the distance between ground electrodes, W _d Where is the spacing between wiring lines and G _d is the distance between wiring lines,

We = W _d -Equation 1

G _d 〉 We-Ge〉 0 ― Equation 2

As in Equation 1, the spacing between the wiring line 302 and the ground electrode 301 should be the same, and the spacing between the wiring line 302 and the ground electrode 301 should be constant so that a plurality of wiring lines 302 can be obtained. ) And the ground electrodes 301 are arranged with a certain regularity.

In addition, in Equation 2, the difference between the distance between the ground electrodes 301 and the distance between the ground electrodes 301 must be smaller than the gap between the wiring lines 302, and one of the ground electrodes 301 must be satisfied. ) Is prevented from coming into contact with other adjacent wiring lines 302 at the same time. The ground electrode 301 is preferably made as long as possible under the condition that the above conditions are satisfied. This is because, if possible, lengthening the individual ground electrodes 301 can minimize the field distortion.

The ground electrode 301 may be formed on the bottom surface of the spacer 104 by a deposition method such as sputtering using a shadow mask, an evaporation method, or a method using etching. It can be formed by plating partially or by plating the whole and then removing unnecessary parts by etching, or by precise dispensing or screen printing using metal paste. It can be formed simply.

As described in detail above, the ground electrode structure of the FDP panel of the present invention is so that the ground electrodes provided on the lower side of the spacer are separated from each other so that the ground electrodes are positioned on the upper portion of the wiring line. By preventing contact with the wiring line, there is an effect of preventing signal disturbance caused by short.

In addition, by excluding the buffer layer which is essentially used to prevent the contact between the ground electrode and the wiring line as described above, there is an effect that the manufacturing cost and productivity is improved due to the labor savings.

1 is a schematic cross-sectional view of a FED panel to which a conventional micro-tip field emission device is applied.

2 is an enlarged cross-sectional view of a conventional portion A;

3 is a schematic cross-sectional view of a MIM type FED panel having a ground electrode structure of the present invention.

Figure 4 is an enlarged cross-sectional view of the field emission device according to the present invention.

5 is a side cross-sectional view of a panel in which a ground electrode according to the present invention is installed in a spacer.

Explanation of symbols on the main parts of the drawings

104: spacer 301: ground electrode

302: wiring line

Claims (2)

In the FD panel having a spacer for maintaining a gap between the rear glass and the anode plate, the ground electrode is provided below the spacer, The ground electrodes are separately formed on the top surface of the plurality of wiring lines separated on the rear glass, respectively, to prevent a short circuit between the wiring lines.  And a lower end portion of the spacer is in contact with and supported by an upper surface of each ground electrode. The method of claim 1, If the distance between the ground electrodes is We, the distance between the ground electrodes is Ge, the distance between the wiring lines is W _d , and the distance between the wiring lines is G _d , We = W _d A ground electrode structure of an FDP panel, wherein a ground electrode is formed such that a relationship of G _d > We-Ge >