KR19990065303A - Field effect display element, its driving method and spacer manufacturing method - Google Patents

Abstract

Disclosed are a field effect display device, a driving method thereof, and a spacer manufacturing method thereof. A spacer provided between the positive electrode plate and the negative electrode plate for maintaining the gap between the positive electrode plate and the negative electrode plate has an upper and lower support layer serving as a support layer, and at least one electrode layer interposed between the upper and lower support layers. The first electrode layer, the first insulating layer, the second electrode layer, the second insulating layer, the third electrode layer, the third insulating layer and the fourth electrode layer, and the upper support layer are sequentially formed thereon. In the field effect display device employing the spacer, the first electrode layer is driven by applying a positive bias voltage, and the second and fourth electrode layers are driven by applying a negative bias of a predetermined level, respectively. According to the field effect display device, the time required for manufacturing the spacer is shortened, and the supporting strength of the insulating layer of the ceramic material interposed between the electrode layers is increased, thereby reducing the aspect ratio, which is the ratio to the height of the spacer occupancy. It can be made as large as desired, and a large number of electrode layers are provided in the spacer, and thus the luminance efficiency is increased by improving the electron concentration efficiency of the electron beam to the fluorescent film, which is driven by the electron lens role during driving.

Description

Field effect display element, its driving method and spacer manufacturing method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field effect display device, a method of driving the same, and a method of manufacturing the spacer thereof. Specifically, a partial region of a spacer provided to maintain a constant gap between the anode plate and the cathode plate is focused on the electron beam toward the anode plate. A field effect display device, a driving method thereof, and a spacer manufacturing method thereof, which can be used as a plurality of electrodes.

1 is a schematic cross-sectional view of a conventional field effect display device.

As shown in the drawing, the field effect display element 10 is provided with a positive electrode plate 11 and a negative electrode plate 12 which are arranged to be spaced apart from each other by a spacer 13. In addition, a plurality of micro tips 14 are formed at a predetermined distance on the negative electrode plate 12. These micro tips 14 are provided in the through holes 16 surrounded by the insulating layer 15 formed on the negative electrode plate 12. The gates 17 are stacked on the insulating layer 15. The fluorescent film 18 is formed on the positive electrode plate 11. The spacer 13 serves only as a support for maintaining a gap between the positive electrode plate 11 and the negative electrode plate 12. Reference numerals 11a and 12a denote positive and negative electrodes, respectively.

Thus, the conventional spacer 13 installed to serve only as a support was made by screen printing a glass paste several times using a mask 19, as shown in FIG.

However, according to the conventional method of manufacturing a spacer by screen printing, the screen printing and curing processes are performed about seven times in order to make the height of the spacer 13, which is the retention gap distance between the positive electrode plate 11 and the negative electrode plate 12, required about 200 μm. It takes a lot of time because it must be repeated. In addition, during curing, the glass paste may appear to fall down, or due to an alignment error during the repeating process, an aspect ratio (height / width) that is a ratio of the occupied width to the height of the spacer 13 to the supporting object is greatly increased. There is a problem that is very difficult to do.

On the other hand, the spacer cannot be used to have electrical repulsive force against electrons due to the insulating property of the holding material, so that absorption due to penetration into the spacer surface of some of the beams emitted from the microtips toward the spacer is directed to the anode plate. There is a disadvantage that cannot be defended, and thus the ratio of the amount of electron beam generation from the microtips to the amount of electron beam arrival to the anode plate is reduced, thereby not contributing to the improvement of the luminance efficiency reduction.

The present invention has been made to improve the above problems, can reduce the time required for the manufacturing process, can increase the aspect ratio of the manufactured spacer, improve the brightness by suppressing the electron beam penetration to the spacer surface An object of the present invention is to provide a field effect display device and a method of manufacturing the spacer, which can contribute to the same.

1 is a schematic cross-sectional view of a conventional field effect display device,

FIG. 2 is a cross-sectional view showing a part of a manufacturing process of the conventional spacer manufacturing method of the field effect display device of FIG.

3 is a cross-sectional view showing a field effect display device according to the present invention;

4 to 7 are diagrams showing step by step in order to explain a method of manufacturing a spacer of a field effect display device according to the present invention;

4 is a cross-sectional view showing a process of applying a predetermined thickness by rolling a ceramic face on a lower portion of a metal plate;

FIG. 5 is a cross-sectional view illustrating a process of forming an electrode layer electrically separated from each other by pressing a roller in a state in which two metal plates obtained through the process of FIG.

6 is a cross-sectional view after forming a composite layer having four electrode layers separated from each other by an insulating layer by attaching a metal plate on the lower part of the laminate of FIG. 5,

FIG. 7 is a partially cutaway perspective view of a plurality of through holes formed by punching the composite layer of FIG. 6 vertically; FIG.

8 is a perspective view after the formation of a plurality of support protrusions on the upper and lower composite layers of FIG.

Explanation of symbols for main parts of the drawings

10, 30: field effect display element 11, 31: bipolar plate

12, 32: negative electrode plate 13, 50: spacer

14, 34: microtip 15, 35: insulating layer

16, 36 through-hole 17, 37: gate

18, 38: fluorescent film 19: mask

40: sealing material 51: lower layer (supporting projection)

52: first electrode layer 53: first insulating layer

54: second electrode layer 55: second insulating layer

56: third electrode layer 57: third insulating layer

58: fourth electrode layer 60: through hole

80: metal plate 90: ceramic paste

91: roller

In order to achieve the above object, the field effect display device according to the present invention includes a positive electrode plate and a negative electrode plate disposed to face each other at a predetermined distance, and at least one positive electrode and a negative electrode formed in a predetermined pattern on opposite surfaces of the positive electrode plate and the negative electrode plate, Microtips disposed on the cathode at predetermined intervals, an insulating layer laminated on the negative electrode plate and the negative electrode to surround the microtips, a gate stacked on the insulating layer having an opening to open the top of the microtips, A field effect display device having at least one spacer disposed between the positive electrode plate and the negative electrode plate to maintain a gap between the positive electrode plate and the negative electrode plate, the spacer comprising: upper and lower support layers spaced at a predetermined distance; And at least one electrode layer interposed between the upper and lower support layers to be electrically separated from each other. An insulating layer is interposed between the electrode layers, and preferably a first electrode layer, a first insulating layer, a second electrode layer, a second insulating layer, a third electrode layer, a third insulating layer, and a fourth insulating layer thereon. The electrode layer and the upper support layer have a structure sequentially provided. Preferably, the first to third insulating layers are made of a ceramic material, and the upper and lower support layers are each formed of a glass material.

In addition, in order to achieve the above object, a method of driving a field effect display device according to the present invention includes: a first electrode layer, a first insulating layer, a second electrode layer, a second insulating layer, a third electrode layer, The first electrode layer applies a positive bias voltage to the spacer having a structure in which the third insulating layer, the fourth electrode layer, and the upper support layer are sequentially provided, and the second to fourth electrode layers each have a predetermined level. It is characterized by driving by applying a negative bias.

In addition, the method for manufacturing a spacer of the field effect display device according to the present invention to achieve the above object is a. Forming a composite layer having an insulating layer interposed between each of the plurality of metal plates used as electrode layers; I. Forming a plurality of through-holes that become electron beam passages vertically on the composite layer obtained in the temporary step; And c. And forming a plurality of support protrusions on the upper and lower portions of the composite layer, respectively. The composite layer has a structure in which a first insulating layer, a second electrode layer, a second insulating layer, a third electrode layer, a third insulating layer, and a fourth electrode layer are sequentially stacked on the first electrode layer by the metal plate. Here, the support protrusions become upper and lower support layers, and the metal plate becomes an electrode layer.

Hereinafter, a field effect display device, a driving method thereof, and a spacer manufacturing method thereof according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

3 is a cross-sectional view showing a field effect display device of a preferred embodiment according to the present invention.

Referring to the drawings, the field effect display element 30 is supported by the sealing member 40 at a predetermined distance from each other with the positive electrode plate 31 and the negative electrode plate 32 whose inner spaces are sealed by the spacer 33. have. In addition, a plurality of micro tips 34 are formed at a predetermined distance on the cathode 32a formed on the cathode plate 32. These micro tips 34 are provided in the through hole 36 surrounded by the insulating layer 35 formed on the cathode 32a. The gates 37 are stacked on the insulating layer 35. The fluorescent films 38 are formed on the anode 31a formed on the anode plate 31.

Here, the spacer 50 provided between the gate plate 37 and the positive electrode plate 31 to maintain the separation distance between the positive electrode plate 31 and the negative electrode plate 32 is a lower and upper support layer 51 which is a support protrusion made of glass material. Between the first electrode layer 52, the first insulating layer 53, the second electrode layer 54, the second insulating layer 55, the third electrode layer 56, the third insulating layer 57, The fourth electrode layer 58 is provided. Each insulating layer 53, 55, 57 is formed of a ceramic material.

The through hole 60 (see FIG. 7) of the spacer 50 constituting a body provides an electron beam projection path from the microtips 34 to the fluorescent film 38.

The first electrode layer 52 of the spacer 50 formed as described above is applied with a positive voltage of a predetermined level to accelerate the progress of electrons emitted from the microtips 34, and the second electrode layer to the fourth electrode layer. The negative voltages (-) of predetermined levels are used in (54), (56) and (58) to focus the electron beam onto the fluorescent film 38 by the role of an electric lens.

Accordingly, a predetermined level of positive bias is applied to the gate 37 so that the electrons emitted from the microtips 34 due to the electric field effect are relatively prevented by the positive voltage applied to the first electrode layer 52. Movement to the positive electrode 31a subjected to a higher voltage positive bias is promoted, and then negative bias applied to the remaining second to fourth electrode layers 54, 56 and 58 of the spacer 50. By advancing the trajectory of the electron beam in the center of the through hole 60 of the spacer 50 by the repulsive force with the electrons due to the voltage, the trajectory of the electrons is focused on the fluorescent film 38. As a result, the penetration of the electrons emitted from the microtips 34 toward the inner wall of the spacer 50 is suppressed, contributing to the improvement of the luminance efficiency.

A spacer manufacturing method of the field effect display device 30 will be described with reference to FIGS. 4 to 8. The same elements as in the previous drawings are denoted by the same member number.

First, as a first step of forming a composite layer having an insulating layer interposed between each of the plurality of metal plates used as electrode layers, as an insulating material and solid on one metal plate 80 prepared for use as an electrode layer as shown in FIG. The insulating layer by the ceramic paste 90 is formed above and below the metal plate 80 by penetrating between the rollers 91 on which the ceramic paste 90 having a large supporting strength in the state is applied. This process is repeated for a separate metal plate 80, the two metal plates 80 obtained by overlapping each other and passed through the roller 91 as shown in Fig. 5 to be joined by compression.

Subsequently, a separate metal plate is adhered to each of the upper and lower portions of the insulating layer of the surface layer thickening ceramic paste of the laminate obtained in FIG. 5, and the first electrode layer 52, the first insulating layer 53, A body having a composite layer of the second electrode layer 54, the second insulating layer 55, the third electrode layer 56, the third insulating layer 57, and the fourth electrode layer 58 is formed. Here, each of the electrode layers 52, 54, 56, 58 is formed of a metal plate 80, and each of the insulating layers 53, 55, 57 is formed of a ceramic paste 90. Thereafter, a heat treatment process for solidifying the ceramic paste 90 is performed.

Next, as shown in FIG. 7, a plurality of through holes 60, which are electron beam passages, are vertically formed as a punching machine.

And finally, if a plurality of lower and upper layers (51, 59) to be a support projection made of glass material in the upper and lower of the composite layer is completed the manufacture of the spacer (50).

The spacer 50 thus manufactured is interposed between the anode plate assembly having the anode and the fluorescent film formed thereon and the cathode plate having the plurality of microteams and the gates formed therein, and a predetermined pressure inside thereof, for example, a vacuum pressure of about 10 ⁻⁷ Torr. If it is kept in the state of the seal glass (frit glass) of the sealing material (see Fig. 3, 40) is completed to manufacture the field effect display element 30 as shown in FIG.

As described above, according to the field effect display device and the spacer manufacturing method thereof according to the present invention, the time required for manufacturing the spacer is shortened, and the supporting strength is increased by the insulating layers of the ceramic material inserted between the electrode layers. Therefore, the aspect ratio, which is the ratio to the height of the occupied space of the spacer, can be increased as desired, and a plurality of electrode layers are provided in the spacer so that the electron concentration efficiency in the fluorescent film of the electron beam propagated in the through hole by the electron lens role during driving. This improves the brightness efficiency.

Claims (13)

A positive electrode plate and a negative electrode plate disposed to face each other at a predetermined distance, at least one positive electrode and a negative electrode formed in a predetermined pattern on opposite surfaces of the positive electrode plate and the negative electrode plate, micro tips disposed at predetermined intervals on the negative electrode, and the micro tip An insulating layer laminated on the negative electrode plate and the negative electrode so as to surround the negative electrode, a gate laminated on the insulating layer having an opening so that an upper portion of the microtips is opened, and between the positive electrode plate and the negative electrode plate to maintain a gap between the positive electrode plate and the negative electrode plate. In the field effect display device having at least one spacer provided, The spacer Upper and lower support layers spaced a predetermined distance apart; And at least one electrode layer interposed between the upper and lower support layers to be electrically separated from each other. The field effect display device of claim 1, wherein an insulation layer is interposed between the electrode layers. 3. The method of claim 2, wherein a first electrode layer, a first insulating layer, a second electrode layer, a second insulating layer, a third electrode layer, a third insulating layer and a fourth electrode layer, and the upper support layer are sequentially provided thereon. A field effect display element characterized in that. The field effect display device of claim 3, wherein the first to third insulating layers are formed of a ceramic material. The field effect display device of claim 3, wherein the upper and lower support layers are formed of a glass material. The field effect display device of claim 1, wherein the lower support layer supports the gate and the upper support layer supports the positive electrode plate. The field effect according to any one of claims 1 to 3, wherein the spacer is formed in one body, and a plurality of through holes are formed to provide an electron beam projection path from the microtips to the fluorescent films. Display element. end. Forming a composite layer having an insulating layer between each of the plurality of metal plates; I. Forming a plurality of through-holes that become electron beam passages vertically on the composite layer obtained in the temporary step; And All. And forming a plurality of support protrusions on the upper and lower portions of the composite layer. The structure of claim 8, wherein the composite layer has a structure in which a first insulating layer, a second electrode layer, a second insulating layer, a third electrode layer, a third insulating layer, and a fourth electrode layer are sequentially stacked on the first electrode layer by the metal plate. Spacer manufacturing method of the field effect display device, characterized in that formed by. The method of claim 9, wherein the composite layer A step of laminating a predetermined thickness with a paste of insulating material on and under the one metal plate; 2. repeating step 1 for another metal plate; (3) superimposing and joining the two metal plates obtained through Step 1 and Step 2; 4. A method of manufacturing a spacer of a field effect display device, comprising: attaching a metal plate to a lower portion of a surface layer of a paste of the insulating material of the laminate obtained through step 3, respectively. 11. The method of claim 10, wherein the insulating material is ceramic. The method of claim 8, wherein the support protrusion is formed of a glass material. A positive electrode plate and a negative electrode plate disposed to face each other at a predetermined distance, at least one positive electrode and a negative electrode formed in a predetermined pattern on opposing surfaces of the positive electrode plate and the negative electrode plate, micro tips disposed at predetermined intervals on the negative electrode, and the micro tip An insulating layer laminated on the negative electrode plate and the negative electrode so as to surround the negative electrode, a gate laminated on the insulating layer having an opening so that an upper portion of the microtips is opened, and between the positive electrode plate and the negative electrode plate to maintain a gap between the positive electrode plate and the negative electrode plate. A field effect display having a spacer disposed between the lower support layer and the upper support layer, the spacer having a first electrode layer, a first insulation layer, a second electrode layer, a second insulation layer, a third electrode layer, a third insulation layer, and a fourth electrode layer sequentially formed. In the driving method of the device, The first electrode layer is driven by applying a positive bias voltage, and the second and fourth electrode layers are driven by applying a negative bias of a predetermined level, respectively. Way.