KR20040069151A - Spacer for fed panel and fabrication method thereof - Google Patents

Abstract

PURPOSE: A spacer for FED panel and a fabricating method thereof are provided to prevent the distortion of the electric field and reduce the power consumption by preventing the electrification of the spacer. CONSTITUTION: An FED panel includes a spacer, which is installed between an anode plate and a cathode plate. The spacer is formed with a three-layer tape including an insulating tape(111) and a conductive tape(112) adhered on both sides of the insulating tape. A specific resistance of an insulating material of the insulating tape is more than 10¬12¥Øcm. The insulating material of the insulating tape is formed with one of Al2O3 and SiN.

Description

Spacer for FPD panel and manufacturing method therefor {SPACER FOR FED PANEL AND FABRICATION METHOD THEREOF}

The present invention relates to a spacer of a FDP panel, and in particular to prevent the electric charge of the spacer to prevent the distortion of the electric field and to reduce the power consumption of the FDP panel spacer and its manufacturing method It is about.

FED (Field Emission Device), which can realize the thickness of LCD or PDP while providing image quality with excellent characteristics like CRT, is being actively researched due to various advantages.

The FED panel having the FED as described above is shown in FIG. 1, which is briefly described with reference to FIG. 1, in which phosphors 2 and black metrics 3 which emit light are coated on the inner surface of the front plate 1. An anode plate 4 and a plurality of FEDs 7 are arranged so that a constant gap is maintained below the anode plate 4 and an electron emission source has an emitter 6 on the upper surface of the substrate 5. It is composed of a cathode plate (8) formed and a spacer (9) provided between the anode plate (4) and the cathode plate (8) to support a constant vacuum gap.

In the field emission device installed as described above, when a sufficient voltage is applied to both ends of the gate electrode and the cathode electrode, a strong electric field is formed thereby. Are released.

The electrons emitted and accelerated as described above collide and emit light with high energy at a pixel of the phosphor 2 located above, and the matrix of R (red), G (green), and B (blue) phosphors is arranged in a matrix. Color displays are realized by dots.

In order to manufacture a panel having high color purity and luminance in the field emission device as described above, electrons emitted from the emitter 6 must be accelerated and collided with the phosphor 2 corresponding to the same. If the electrons do not hit the phosphors 2 corresponding to the emitter 6 but hit the adjacent phosphors 2, light emission occurs in the adjacent phosphors 2, thereby degrading color purity. In addition, the corresponding phosphor 2 is reduced in brightness and appears dark. Therefore, the electron beam of the ideal field emission device must move vertically in the cathode plate 8 to excite only each corresponding phosphor 2.

The electron beam is essentially forced to move perpendicular to the equipotential plane. When voltage is applied between the cathode plate 8 and the anode plate 4 facing in parallel to each other, an equipotential surface parallel to the two plates is formed between the two plates, so that the electron beam must move perpendicular to the cathode plate 8. . However, in actual field emission devices, there are elements that disturb the movement of the electron beam to generate the distortion of the beam.

Among the various factors, the distortion of the electron beam by the spacer 9 represents the most serious problem. In order to maintain an electric field in the field emission device, the spacer 9 should basically be an insulator. Since the insulator is larger than the secondary electron emission coefficient 1, the charge is positive when the electron beam is hit by the adjacent emitter 6. This charging of the spacer 9 distorts the electric field around the spacer 9, thereby causing distortion of the electron beam.

Accordingly, various methods for preventing the electric field distortion as described above have been proposed. Representative methods include a method of depositing a material having a low secondary electron emission coefficient on the side of the spacer 9, a method of depositing a conductive thin film on the side of the spacer 9, and a metal electrode strip on the side of the spacer 9. Forming method;

However, these methods are performed by adding a separate process after manufacturing the spacer 9, there is a problem to increase the manufacturing cost and manufacturing cost.

In addition, there is a method of imparting conductivity to the spacer 9 itself, which is an insulator. However, when the resistivity is very low, the power consumption becomes too large due to the high voltage applied to the anode plate 4, and the spacer 9 and the emi due to heat generation. There was a problem that deterioration of the rotor 6 occurred.

An object of the present invention devised in view of the above problems is to prevent the accumulation of charge in the spacer itself to prevent the distortion of the electric field caused by charging and to reduce the power consumption in the spacer. Disclosed is a suitable spacer for a FPD panel and a method of manufacturing the same.

1 is a schematic cross-sectional view of a FED panel having a conventional field emission device.

2 is a schematic cross-sectional view of a MIM type FED panel having a spacer of the present invention.

Figure 3 is an enlarged cross-sectional view of the field emission device according to the present invention.

4 is a cross-sectional view of a spacer according to the present invention.

5 is a perspective view showing a manufacturing process of the spacer according to the present invention.

Explanation of symbols on the main parts of the drawings

101: anode plate 102: cathode plate

104: spacer 111: insulating tape

112: conductive tape 113: insulating green tape

114: conductive green tape 120: roll laminator

121: sintered body

In order to achieve the object of the present invention configured as described above

In the FPD panel in which a spacer is provided between the anode plate and the cathode plate,

The spacer is provided with a spacer for the FD panel, characterized in that the three-layer tape is a conductive tape adhered to both sides of the insulating tape.

Moreover, in the manufacturing method of the spacer for FPD panels,

A conductive green tape is manufactured by mixing a ceramic powder, a conductive material, and a binder through tape casting, and separately, a ceramic green tape is produced by a tape casting by mixing a ceramic powder, an insulating material, and a binder, and the conductive green tape After the insulating green tape is adhered to both surfaces, the bonded three-layer tape is sintered, and the laminated sintered body is manufactured in the order of cutting to a predetermined size.

Hereinafter, the present invention will be described in more detail with reference to the embodiment of the present invention, the FD panel spacer and the manufacturing method of the accompanying drawings configured as described above.

2 is a schematic cross-sectional view of a MIM type FED panel having a spacer of the present invention, FIG. 3 is an enlarged cross-sectional view of a field emission device according to the present invention, and FIG. 4 is a cross-sectional view of the spacer according to the present invention.

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 (not shown) is installed to maintain the sealing material, the inside of the anode plate 101 and the cathode plate 102, the sealing material (not shown) is installed, the anode plate 101 and the cathode plate 102 The spacer 104 is installed so that a constant distance 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 an upper surface of the rear glass 201, and a lower electrode 204 formed on an 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).

The spacer 104 provided between the anode plate 101 and the cathode plate 102 is made of a three-layer tape having a conductive tape 112 adhered to both sides of the insulating tape 111.

The insulating tape 111 is a mixture of a ceramic powder, such as Al ₂ O ₃ or SiN, an insulating material and a binder and other additives, and the conductive tape 112 is also mixed with a ceramic powder, a conductive material and a binder together with other additives. will be.

The insulator is a material having a specific resistance of 10 ¹² Ωcm or more, and in order to prevent shape retention and deformation due to heat generation during sintering, it is preferable to select one whose thermal expansion coefficient does not differ by at least 10% from the conductive material.

The method of manufacturing the spacer 104 of the present invention as described above will be described in detail with reference to FIG.

First, as shown in a) of FIG. 5, a binder and other additives are mixed with a ceramic powder to make a conductive green tape 114, which is a disc before sintering, by tape casting, and there is no electrical conductivity separately, that is, an insulator. Using the ceramic powder of the insulating green tape 113 is produced in the same manner as above. As the insulator used herein, Al ₂ O ₃ or SiN may be used as a material having a specific resistance of 10 ¹² Ωcm or more, and the thermal expansion coefficient does not differ by at least 10% from the conductive material in order to maintain shape during sintering and to prevent deformation due to heat generation. You must choose one.

Next, the insulating green tape 113 is laminated on both sides of the conductive green tape 114 manufactured as shown in FIG. 5 b, and then bonded using the roll laminator 120 to form a three-layer laminate 115 having a plate shape. Make The laminated three-layer body 115 bonded in this way is sintered using a ceramic sintering process to make a three-layer sintered body 121 as in c). When the thickness of the green tapes 113 and 114 is determined, the initial green tape may be equal to or slightly thicker than the thickness of the spacer 104 to be applied to the display panel. 113) (114) should be matched. Since the charge accumulation portion is concentrated on the surface of the spacer 104 when the electron beam is incident, only the surface portion is made of a conductive material, and the center portion which does not play a role in removing the charge is made of an insulator.

Then, the upper and lower surfaces are ground to match the surface roughness of the three-layer sintered body 121 obtained as described above or to adjust the thickness to a desired degree. Then, using a diamond wheel or the like, the plate-like three-layer sintered body 121 is cut by the wheel 122 as shown in FIG. 5 d), and finally, the conductive tape 112 is formed on both surfaces of the insulating tape 111 as shown in e). Completes the spacer 104 having a three-layer structure bonded thereto.

Finally, the spacer 104 as shown in e) of FIG. 5 is manufactured through the above process, and the power consumption reduction effect of the spacer 104 thus produced is calculated as follows.

The resistance R1 when the entire thickness is made of a conductive material and the center of 1/3 of thickness is made of an insulating material, and the resistance R2 when 2/3 of both sides are made of a conductive material are as follows. Is established.

ρi: resistivity of insulation

ρc: resistivity of conductive material

In the above relationship, if the resistivity of the insulator is 100 times greater than the resistivity of the conductive material, then R2 is about 1.5 times R1. This means that when the high voltage is applied, power consumption through the spacer can be reduced to 70%.

In the actual spacer, the charge accumulation by the electron beam incident is only about 10 μm from the surface, so the thickness of the conductive material can be reduced from 1/5 to 1/10 of the total thickness. The smaller the thickness of the conductive material, the greater the reduction in power consumption.

It is also possible to manufacture the spacer into a segment type or a cylindrical shape using the above principle.

As described in detail above, the present invention, the FDP panel spacer and its manufacturing method is a three-layer bonded body in which the conductive tape is bonded to both sides of the insulating tape, and serves as a spacer insulator as the insulator by the insulating tape. By discharging the electric charges charged through, there is an effect that the distortion of the electric field due to charging is prevented.

In addition, by lowering the power consumption while maintaining the characteristics of the electrical conductivity, the stability of the power supply is secured, and the deterioration of spacers, emitters, phosphors, etc. due to heat generation is prevented.

Claims (4)

In the FPD panel in which a spacer is provided between the anode plate and the cathode plate, And the spacer is a three-layer tape having conductive tape adhered to both sides of the insulating tape. The method of claim 1, The insulating material of the insulating tape is a spacer of the FD panel, characterized in that the specific resistance of 10 ¹² Ωcm or more of any one of Al ₂ O ₃ or SiN. In the manufacturing method of the spacer for FD panel, The conductive green tape is manufactured by mixing the ceramic powder, the conductive material and the binder through tape casting, and separately from the ceramic powder, the insulating material and the binder are mixed to produce the insulating green tape by the tape casting. After the insulating green tape is adhered to both surfaces, the bonded three-layer tape is sintered, and the laminated sintered body is manufactured in the order of cutting to a predetermined size. The method of claim 3, wherein A method of manufacturing a spacer for an FPD panel, wherein the insulating green tape and the conductive green tape are adhered to each other in a roll laminator.