JPH10275577A - Spacer and its manufacture, and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spacer, which has excellent mechanical strength, fluidity at the time of high temperature, withstand voltage and creeping withstand voltage, by selecting material of a spacer inside a vacuum container, and provide a manufacturing method at a low cost appropriate for mass production. SOLUTION: In a spacer 1, which is provided inside a vacuum container formed of a face plate 2 and a rear plate 5 and which resists the atmospheric pressure, the face plate 2 is directly formed on the rear plate 5 by injection molding. At the time of manufacturing spacer, the rear plate 5 is dried, and temperature of a nozzle of an injection molding machine is set higher than the temperature of a cylinder for housing molten liquid crystal polymer, and the molten liquid crystal polymer is injected into a die on the rear plate 5 so that strokes at 95-98% of full stroke of the cylinder is injected at a high injection speed and that the residual stroke of the full stroke is injected at a low injection speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a spacer manufacturing method and a display device including an image forming apparatus to which the spacer is applied.

[0002]

2. Description of the Related Art Conventionally, as an image forming apparatus using an electron-emitting device, an electron source substrate on which a large number of cold cathode electron-emitting devices are formed and an anode substrate provided with a transparent electrode and a phosphor are opposed in parallel to each other. 2. Description of the Related Art A flat-type electron beam display panel that has been exhausted is known. In such an image forming apparatus, the one using a field emission type electron emitting element is, for example,
I. Brodie, “Advanced technology: flat cold-cathode C
RTs ", Information Display, 1/89, 17 (1989). A device using a surface conduction electron-emitting device is disclosed, for example, in US Pat. No. 5,066,883. The line display panel can achieve a lighter weight and a larger screen than a cathode ray tube (CRT) display device which is widely used at present, and a flat display panel using a liquid crystal or a plasma display panel. As compared with other flat display panels such as displays and electroluminescent displays, it is possible to provide higher brightness and higher quality images. As an example of an image forming apparatus used, a schematic configuration diagram of a conventional flat-type electron beam display panel is shown, wherein FIG.
13A is a schematic view on the internal substrate, and FIG. 13C is a cross-sectional view along the line AA ′ in FIG.

The structure of the conventional flat electron beam display panel shown in FIG. 13 will be described in detail. In FIG. 13, reference numeral 150 denotes a rear plate as an electron source substrate, 120 denotes a face plate as an anode substrate, and 160 denotes an outer frame. Yes, these constitute a vacuum envelope. 130 denotes an electron-emitting device, and 1411 and 1421 denote electron-emitting devices 13.
This is an electrode for applying a voltage to zero. 141 (signal electrode side) and 142 (scanning electrode side) are electrode wirings, which are connected to the electrodes 1411, 1421, respectively. Reference numeral 121 denotes a glass substrate serving as a base of the face plate 120; 123, a transparent electrode; and 122, a phosphor. Further, reference numeral 110 denotes a spacer which holds the rear plate 150 and the face plate 120 at a predetermined interval and is disposed as a support member for atmospheric pressure.

In order to form an image on this electron beam display panel, scanning wirings 142 arranged in a matrix are used.
And a predetermined voltage is sequentially applied to the signal wiring 141,
A predetermined electron-emitting device 13 located at the intersection of the matrix
0 is selectively driven to irradiate the electrons emitted from the electron emission portion of the electron emission element 130 onto the phosphor 122 to obtain a bright spot at a predetermined position and form an image. The transparent electrode 1
A high voltage 23 is applied to the electron-emitting device 130 so that the electron-emitting device 130 has a positive potential in order to accelerate the emitted electrons and obtain a bright spot with higher luminance. Here, the applied voltage is a voltage of several hundred V to several tens kV, depending on the performance of the phosphor 122. Accordingly, the distance d between the rear plate 150 and the face plate 120 (precisely, the distance between the wiring 141 and the transparent electrode 123) is set so that a vacuum dielectric breakdown (ie, discharge) does not occur due to the applied voltage.
Generally, it is set to about 100 μm to several mm.

Further, as the display area of the display panel increases, the rear plate substrate 150 and the face plate substrate 121 need to be thickened in order to suppress the deformation of the substrate due to the difference between the vacuum inside the envelope and the atmospheric pressure outside. Came out. Increasing the thickness of the substrate not only increases the weight of the display panel, but also causes distortion when viewed from an oblique direction. Therefore, by appropriately arranging the spacer 110, the load on the strength of the rear plate 150 and the face plate 120 can be reduced, and the weight, cost and size of the screen can be reduced. The advantage can be fully exhibited.

The material used for the spacer 110 is as follows: (1) having sufficient atmospheric pressure resistance (compression strength); and (2) heat resistance capable of withstanding the heating process in the manufacturing process and the high vacuum forming process. (3) that the thermal expansion coefficients of the display panel and the outer frame of the display panel match.
(4) High resistance (insulator) having a withstand voltage that can withstand high voltage application; (5) Low gas release rate to maintain high vacuum; (6) Precision machining of dimensions And high mass productivity are required, and a glass material is generally used.

On the other hand, "Advanced technology: flat cold-
cathode CRTs ”(17-1 of Information Display 1/89
9) and USP 5,063,327, Ivor Brodi
Mr. e discloses a spacer using polyimide.
This applies photosensitive polyimide to the substrate by spin method,
After pre-baking, photolithography (mask exposure,
(Development and washing) steps, and vacuum baking is performed. A polyimide spacer having a height of 100 microns is finally formed on the surface of the cathode substrate. Further, USP 5,371,433 and the like can be cited as examples using photosensitive polyimide.

[0008]

However, when the above-mentioned polyimide spacer material is used, there are the following problems.

[0009] General glass materials are relatively good in mechanical strength, thermophysical properties and outgassing properties.
In addition, the material is easy to use as a spacer because of good workability and mass productivity. However, with respect to the dielectric strength, creeping discharge is likely to occur particularly due to charging of the surface (which is considered to be due to secondary electron emission), so that a very high voltage cannot be applied, and a display with sufficient brightness is required. It is difficult to do.

On the other hand, when a spacer is formed from a polyimide resin by a photolithographic technique, the mechanical strength is inferior to that of a glass material, but it is easy to increase the number of spacers to be arranged. be able to. Although heat resistance and outgassing properties may be slightly inferior to those of glass materials, they can be used without problems in glass envelopes by performing appropriate annealing treatment or the like. Regarding the electrical properties, the insulation resistance is good and the creepage withstand voltage is high. However, the workability has the following problems.

According to the photolithography process described above,
The height of the polyimide spacer formed in one process is at most several to several tens of microns, and it is necessary to repeat the process many times to obtain the desired height d. Therefore, the height of the spacer that can be actually used is at most several hundred microns or less, and the voltage that can be applied to the face plate is limited. For this reason, high-acceleration phosphors with high performance (acceleration voltage several kV to several tens kV) used in current CRTs
) Is difficult to use, and a low-acceleration phosphor having poor performance such as luminance and color purity must be used.

In addition, when a general engineering plastic (engineering plastic) resin is molded into a face plate or a rear plate by injection, the resin has a high viscosity and may not be able to fill the thin portion with the resin.

Therefore, in the present invention, compared with the glass material,
A liquid crystal polymer (Thermotropic Liquiquid) with poor mechanical strength but excellent fluidity at high temperature, dielectric strength and creepage
d) Focus on spacers using Crystal Polymer (LCP), and provide spacers that can be formed to have a high height and are low-cost manufacturing methods suitable for mass production instead of the photolithography method of LCP spacers. The purpose is to: Furthermore, the present invention focuses on the good fluidity at high temperatures, and aims to manufacture a spacer having a narrow rib width for high definition.
At the same time, an object of the present invention is to provide a spacer manufacturing method that eliminates the complexity of the process of arranging spacers, although the number of spacers to be arranged increases due to poor mechanical strength.

[0014]

Means for Solving the Problems The present invention has been made in view of the above, and (1) The spacer of the present invention comprises LCP and is manufactured by an injection molding method. (2) The display device of the present invention has a structure in which a substrate on which a plurality of cold cathode type electron-emitting devices are formed and a transparent substrate on which a luminescent material is formed face each other via a spacer. The spacer is a spacer that satisfies the above conditions. (3) The display device of the present invention is characterized in that the cold cathode type electron-emitting device is a surface conduction type electron-emitting device.

More specifically, the spacer according to the present invention is a spacer which is provided in a vacuum vessel comprising a face plate and a rear plate and which is resistant to atmospheric pressure, and which is directly formed on the face plate or the rear plate by injection molding. It is characterized by that. In the above spacer, the spacer is made of a molten liquid crystal polymer. Further, the spacer is tapered by injection molding at a position where the face plate or the rear plate is formed. Further, the spacer is formed in a tapered shape by the injection molding at a position where the rear plate is drilled, and has a projection inserted into a portion where the face plate is drilled.

A substrate having a plurality of cold cathode type electron-emitting devices formed in an outer container having a vacuum inside, an image forming member for forming an image by irradiating an electron beam emitted from the electron-emitting devices; In a display device comprising a spacer for supporting an outer peripheral device, the spacer is directly formed on the substrate or the image forming member by injection molding, and the spacer is made of a molten liquid crystal polymer.
Further, the cold cathode type electron-emitting device is a surface conduction type electron-emitting device. Further, in the above display device, the electrode of the cold cathode type electron-emitting device is connected to a row wiring and a column wiring, and the spacer is injection-molded on the row wiring or the column wiring. I do.

Further, in a method for manufacturing a spacer against atmospheric pressure provided in a vacuum vessel comprising a face plate and a rear plate, the rear plate is dried,
The temperature of the nozzle of the injection molding machine is set to be higher than the temperature of the cylinder containing the molten liquid crystal polymer to be injected, and the molten liquid crystal polymer is put in the mold on the rear plate by 95 to 98% of the total stroke of the cylinder. The injection is performed at a high injection speed, and then the remaining portion of the entire stroke is injected at a low injection speed. In the method of manufacturing a spacer, the nozzle of the injection molding machine is disposed on a plane side of a rear plate, and after removing the mold after the injection molding, the liquid crystal polymer at an injection portion from the nozzle is cut. And Further, the spacer has a flat plate shape or a cylindrical shape. Further, in the method for manufacturing a spacer, an electron-emitting device is formed on the rear plate, an electrode of the electron-emitting device is connected to a row wiring and a column wiring, and the spacer is the row wiring or the column. It is characterized by being injection molded on the directional wiring.

[Effect] As described above, the heat-resistant, narrow rib width, small amount of released gas, large gap height, high strength against atmospheric pressure, excellent mass productivity, and low cost. At the same time as the mass production of the pulser became possible, it also led to the improvement of the performance of the display device using the same.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1] FIG. 1 is a perspective view of a display panel used in this embodiment, and a spacer 1-1 having the shape shown in FIG. 2 is used. Further, a part of the panel is cut away to show the internal structure. The size of the panel is 150 mm × 250 mm.

In the figure, 2 is a face plate, 2-1 is a glass substrate, 2-2 is a phosphor, 2-3 is an anode electrode as a metal back, 5 is a rear plate, 6 is a side wall, , The rear plate 5 and the side wall 6 form an airtight container for maintaining the inside of the display panel at a vacuum. When assembling the airtight container, it is necessary to seal the joints of the members in order to maintain sufficient strength and airtightness.For example, apply polybenzimidazole to the joints, and in the air or nitrogen atmosphere. The sealing was achieved by baking at 300 degrees Celsius for 20 minutes or more.

Wiring is directly printed on the rear plate 5 and also serves as a wiring board. On the substrate, n × m electron-emitting devices 3 are formed. In this embodiment, n = 1
60, m = 720. Here, n and m are integers of 2 or more, and are appropriately set according to the target number of display pixels. For example, in a display device for displaying a high-definition television, it is desirable to set the number of n = 3000 and m = 1000 or more. The electron-emitting device 3
Are simply wired by m row direction wirings (signal lines 4-2) and n column direction wirings (scanning lines 4-1). The portion constituted by the row direction wiring (signal line 4-2) and the column direction wiring (scanning line 4-1) is called a multi-electron beam source or relatively electron source.

An X-direction wiring terminal D0 for row-direction wiring
_{x1 to} D0 _xm and Y direction wiring terminal D0 _y1 for column direction wiring
ＤD0 _yn and the high voltage terminal Hv are electric connection terminals having an airtight structure provided for electrically connecting the display panel to an electric circuit (not shown). D0 _{x1 to} D0 _xm are wirings in the row direction (signal line 4-2) of the multi-electron beam source and D0 _y1 to D0 _y1 .
_Dyn is a column-directional wiring of the multi-electron beam source (scanning line 4-
1) and Hv is the anode electrode 2-3 of the face plate.
Is electrically connected to

As the electron-emitting device 3 of the present embodiment, for example, the above-mentioned surface conduction electron-emitting device described in Japanese Patent Application Laid-Open No. 7-45221 can be used. Further, a field-emission electron-emitting device, a MIM-type device, or the like made of a sharp-pointed, conical, pyramidal, or acicular metal, silicon, or a carbon material containing diamond or the like can be used.

The above-mentioned surface conduction electron-emitting device is made of Ni or C on an insulating substrate such as blue plate glass, quartz glass or ceramic.
forming a conductive electrode pair of a metal or alloy such as r, Au, Mo, W, Pt, Ti, Al, Cu, Pd, or a metal oxide;
Pd obtained by heating and firing an organic compound containing a noble metal element such as Pd, Pt, Ag, or Au on the conductive electrode pair
Or a conductive thin film of Pt, Ag, Au, PdO, etc., and an electron-forming portion is formed in the conductive thin film by applying a current forming process, and further, an activation process and a stabilization process are performed in a vacuum vessel. And manufactured. This surface conduction electron-emitting device applies a scanning signal and an image input signal to a pair of conductive electrodes to which a row direction wiring (signal line 4-2) and a column direction wiring (scanning line 4-1) are connected. Thereby, an electron beam is emitted from the electron emission portion, and a high voltage is applied to the face plate side, so that the phosphor on the face plate side is irradiated with the electron beam to emit fluorescent light, thereby displaying an image. be able to.

FIG. 2 is a schematic cross-sectional view taken along line AA 'of FIG. 1. In the reference numerals of the respective parts, the same reference numerals as those in FIG. 1 have the same functions. The spacer 1-1 is directly connected to the scanning line 4-1 and the face plate 2, and supports the atmospheric pressure received by the face plate 2 and the rear plate 5. 4-1-1 is a scanning line electrode, and 4-2-1 is a signal line electrode.

In this embodiment, the spacer 1-1 has a through-hole in a part of the scanning line 4-1, and a corresponding portion on the rear plate 5 side has an entrance width w5 (70 μm) and a bottom width. Open a recess of w2 (125μ) and put L
CP is injection molded by injection. With such a configuration, when the spacer 1-1 is removed from the mold, the spacer 1-1 remains on the rear plate 5 side. In addition, the width w1 (10
0 μm) is smaller than the bottom width w2 (125 μm), which makes it easier to remove the spacer 1-1 from the mold. Further, a distance w4 (2) from the upper part of the width of the spacer 1-1 to the phosphor 2-2 of the face plate 2 is set.
(0 μm), the spacer width is sharply tapered, which facilitates separation of the tip of the spacer 1-1 from the mold when the mold is released. In addition, spacer 1-1
The length and width in the scanning line 4-1 direction are determined by the strength supporting the atmospheric pressure, and a length of 70 mm is employed in the present embodiment. The spacer has a height d of 1 mm.

The spacer 1-1 does not need to be fixed to only one of the plates 2 and 5, and the upper portion may be fixed to the face plate 2 with a polyimide adhesive or the like.

The number of spacers 1-1 is designed to be sufficient to support the atmospheric pressure in consideration of the strength of the spacer material.

Further, a phosphor 2-2 and a metal back (anode electrode) 2-3 are formed on the lower surface of the glass substrate 2-1. In the present embodiment, since it is a color display device, phosphors of three primary colors of red, green, and blue used in the field of a cathode ray tube CRT are separately applied to a portion of the phosphor 2-2. The phosphor 2-5 of each color is, for example, as shown in FIG.
As shown in FIG.
The black light absorbers 2-4 are provided between the five stripes. The purpose of providing the black light absorber 2-4 is to prevent the display color from being shifted even if the irradiation position of the electron beam is slightly shifted, and to prevent the reflection of external light to improve the display contrast. If the black light absorber is conductive, it is possible to prevent the phosphor 2-5 from being charged up by an electron beam. Although graphite is used as a main component for the black light absorber 2-4, any other material may be used as long as it is suitable for the above purpose.

The method of applying the three primary color phosphors is not limited to the stripe arrangement shown in FIG. 3A, but may be, for example, an RGB phosphor 2 shown in FIG. 3B. A delta arrangement of 5 or another arrangement may be used.

When a monochrome display panel is manufactured, a monochromatic phosphor material may be used for the phosphor 2-5, and a black conductive material is not necessarily used.

Further, the phosphor 2 is used for applying an acceleration voltage.
A transparent electrode (not shown) made of, for example, ITO may be provided between the face plate 2 and the phosphor 2-2 for the purpose of increasing the brightness of -2.

The purpose of providing the metal back 2-3 is to improve the light utilization rate by mirror-reflecting a part of the light emitted from the phosphor 2-2, and to protect the phosphor 2-2 from the collision of negative ions. To act as an electrode for applying an electron beam acceleration voltage, and to act as a conductive path for the excited electrons of the phosphor 2-2. Metal back 2-
No. 3 was formed by forming the phosphor 2-2 on the face plate 2, then smoothing the surface of the phosphor 2-2, and vacuum-depositing aluminum thereon. The phosphor 2
When the phosphor material for exciting low-acceleration electron beams is used for -2, the metal back 2-3 may not be used in some cases. In this case, a transparent electrode is provided between the face plate 2 and the phosphor 2-2, and an electron beam acceleration voltage is applied to the transparent electrode.

In order to evacuate the inside of the hermetic container to a vacuum, after assembling the hermetic container, an exhaust pipe (not shown) and a vacuum pump are connected, and the inside of the hermetic container is set to about 1.3 × 10 ⁻⁵ Pa. Evacuate to a vacuum. After that, the exhaust pipe is sealed,
In order to maintain the degree of vacuum in the airtight container, a getter film (not shown) is formed at a predetermined position in the airtight container immediately before or after sealing. The getter film is, for example, a film formed by heating and depositing a getter material containing Ba as a main component by a heater or high-frequency heating, and the inside of the hermetic container is 1.3 × 10 ⁻³ or less due to the adsorbing action of the getter film. The degree of vacuum is maintained at about 1.3 × 10 ⁻⁵ Pa.

The basic configuration and manufacturing method of the display panel according to the embodiment of the present invention have been described above. Hereinafter, the spacer used in the present embodiment will be described.

[Explanation of molten liquid crystal polymer] <Characteristics and molecular structure>
iquid Crystal Polymer (LCP) is a highly heat-resistant thermoplastic resin that exhibits liquid crystallinity in the molten state, is injection-moldable, and has a very good fluidity compared to other engineering plastics (engineering plastics). have.

The product obtained by injection molding is
It has a skin-core structure unique to liquid crystal polymers, while the polymer is a rigid rod-shaped polymer, so it is highly oriented in the molten state and has the effect of fiber reinforcement. This is why it is called a self-fiber reinforced polymer.
LCP is one of the major factors that came to the spotlight in the world.

The energy required to melt LCP from the solid state is 1/10 to 1/1 of that of general engineering plastics.
Just 00. Therefore, the singulation speed is high, burrs are not easily formed, the molding cycle is shortened, and sufficient physical properties can be obtained even at a low mold temperature. This plays a major role in reducing various costs required for injection molding.

Further, the heat resistance, which is one of the features of the LCP, is divided into three types using the resin load deflection temperature (TDUL) as an index for convenience. Generally, TDUL ≧ 26
The case of 0 ° C. is classified as Type I, and the case of TDUL ≦ 220 ° C. is classified as Type III.
P is classified into Type II. The various properties of LPC as described above are determined by what kind of monomer is used for parahydroxybenzoic acid to copolymerize a linear hard linear chain. Commonly used monomers include terephthalic acid, biphenols, 2,6-naphthalenedicarboxylic acid, hydroxynaphthoic acid, isophthalic acid, and the like. In addition, LC containing amide bond or ether bond
There is also P.

<Flow characteristics> LCP not only has a very good flowability than other engineering plastics, but also has a very high singulation rate and little burrs. When filling LCP resin into the mold, it flows in with very low viscosity due to the appropriate molten resin temperature and shear stress rate, but when cooled in the mold and the shear rate decreases, the viscosity rises sharply. And individualize in a short time. At this time, since a thin individual layer having a high molecular orientation called a skin layer is formed on the surface of the molded product, the resin does not flow into the minute gap, and the generation of burrs is suppressed.

Therefore, when LCP is used for injection molding, it is necessary to carry out injection at the highest possible speed and take measures to minimize the filling time.

<Heat Resistance> When an LCP is used as a spacer for a flat panel display, the usable LCP is limited to Type I because of a panel sealing step and a baking step (300 ° C. or higher). You. Specifically, Sumitomo Chemical's “Sumika Super” E4000, E
5000 series, Nippon Petrochemical Co., Ltd.'s "FC11
0, G430 ”,“ 300X ”of Idemitsu Petrochemical Co., Ltd.
"HAG-140" by Tosoh Corporation and "Zenite" by DuPont Corporation. In addition to the above, Dartco
"Zyder", Hoechst Celanese "Vectra", Mitsubishi Chemical Corporation "Novaculate", Unitika "Lot Run", Ueno Pharmaceutical Co., Ltd. "UENO LC"
P "and Toray's" Siveras "can also be used.

<Characteristics and Dimensional Stability> LPC has self-reinforcing properties, and the mechanical properties (strength and elastic modulus) per unit sectional area are improved as the thickness is reduced. This is because a skin layer in which the resin is very strongly oriented is formed on the surface of the molded product.

Therefore, if the surface of the component injection molded by the LCP is removed by cutting or the like, the overall mechanical strength is reduced to the same level as that of a normal crystalline resin. In addition, since the molecular bond of the LCP is a polyester bond, the water absorption is small, so that the dimensional change due to environmental changes after forming the spacer and before panelization is small, and the storage with the spacer is easy to store during the process. It is.

The surface withstand voltage is as high as 10 kV / mm, and is effective in preventing discharge in a panel to which a high voltage is applied.

The manufacturing method will be described below in detail with reference to the drawings.

<Injection Molding> LCP has a very low viscosity under injection conditions because the melt viscosity has a large temperature dependency and a large shear rate dependency compared to other engineering plastics. Shows sex.

The LCP can be molded by using a general-purpose injection molding machine. FIG. 4 (a) is a view showing an actual injection molding machine, wherein 7 is a plunger, 1-0 is an LCP which is an injection molding material, 8 is a torpedo, 9
Is a heater, 10 is a heating cylinder, 11 is a nozzle, 1
2 is composed of a sprue and dies A and B. 5 is the above-mentioned rear plate. In such a configuration, the material LCP1-0 in the hopper is heated and melted by the heater 9 in the heating cylinder 10, and is injected into the molds A and B closed by the plunger 7 to be molded. Mold A,
B is always temperature-controlled, and materials 1-0 of molds A and B are used.
Is to be solidified.

The molding conditions are shown below.

(1) Preliminary drying Since the water absorption is extremely low, long-time drying and special hopper dryer are unnecessary. However, when the thickness of the spacer 1-1 is reduced for high definition, the inside of the molds A and B should be dried at 130 to 150 ° C. for 3 hours or more for stability during molding and quality control. Is desirable.

(2) Molding temperature In this embodiment, high fluidity is required, so the nozzle temperature is set slightly higher. Setting the temperature at the rear of the cylinder 10 lower by 10 to 20 ° C. also has an effect on fluidity.

(3) Mold Temperature Since the solidification rate is high, the influence of the mold temperature on the physical properties is hardly recognized. However, since the spacer is used to mold a thin product, the mold temperature is set to a high 160 to 190.
Set to ° C.

(4) Injection Pressure and Temperature Since LCP has a low melting temperature, molding can be performed at a lower pressure than ordinary engineering plastics. In the present embodiment, molding was performed at an injection pressure as low as 320 kg / cm ² .

(5) Injection Speed Since the molten resin temperature has a great influence on the melt viscosity and the shearing speed, it is at a filling speed close to almost 100% of the molding stroke. In this embodiment, the filling time is 0.3 seconds. Set. As the filling speed decreases, the viscosity increases significantly, and the flow of the resin stops immediately and separates. Thus, taking a high injection speed over 95-98% of the stroke and then a low (50-75% reduction) speed at the end of the stroke allowed the filling of the elongate part without burrs.

As described above, the LCP injected from the nozzle 11 through the sprue 12 into the mold A is as shown in FIG.
As shown in FIG. 5A, through the injection hole 15 at the bottom of the injection groove 14 of FIG. 5A, and then through the injection hole 16 of the mold B of FIG. Cavity 17 for one
It is led to.

Next, after the LCP in the mold B is cured, the mold A is first pulled up in the direction of the arrow as shown in FIG.
The LCP inside is separated and cut. Then, as shown in FIG. 4 (c), the mold is further lifted in the direction of the arrow, so that the mold A
LCP in the inside is removed and spacer 1-1 is placed on rear plate 5
Will remain. As shown in FIGS. 2 and 4, the lower portion of the spacer 1-1 has an anchor effect, and the spacer 1-1 is firmly fixed to the rear plate 5. , From the rear plate 5. However, since the adhesive force between the LCP and the rear plate 5 is strong, it is not necessary to adopt a configuration having an anchor effect. In this case, since there is no need to form a hole for the spacer 1-1 in the upper wiring portion, the process can be simplified.

FIG. 6 (a) shows a cross section when the spacer 1-1 of the LCP standing on the rear plate 5 is used as a panel. FIG. 6A is a cross-sectional view including the spacer 1-1, the support frame 6, and the face plate 2 which are injection-molded on the rear plate 5. FIG. 6B is a view of the panel as viewed from above. As can be seen from this figure, a large number of spacers 1-1 are connected to the rear plate 5 in a short time.
It is now possible to stand.

As described above, by using the LCP having good fluidity in the manufacturing method by injection molding, the ribs of the spacer 1-1 can be easily produced in large quantities with thin ribs and high height. . At the same time, if only the vertical direction of the spacer 1-1 and the rear plate 5 is accurately set, the accuracy of setting the spacer 1-1 vertically to the rear plate 5 is remarkably improved as compared with other methods. . Furthermore, by using the spacer 1-1 manufactured by such a method in a display device using a cold cathode type electron-emitting device such as a surface conduction type electron-emitting device, handling becomes easy and assembly performance is improved. Has the effect of improving significantly. As a result, there is an effect that the process can be shortened and the manufacturing cost can be reduced.

Further, since the LCP spacer has a high creepage breakdown voltage, it has a large effect in preventing discharge inside the panel.
By using the LCP, discharge can be prevented.

The released gas rate in the vacuum of the LCP is 1.3 × 10 ⁻⁵ Pal (liter) / cm ² s
It was very small below ec, and the effect of extending the life of the display device was also recognized.

The spacer 1-1 may be injection-molded on the face plate 2 side instead of the rear plate 5. In this case, since the thermal history at the time of injection does not reach the rear plate 5, there is also an effect of reducing the single defect of the electron source.

[Embodiment 2] FIG. 7A shows a method of injecting LCP by injection from the horizontal direction. In addition,
When the reference numerals of the constituent members are the same as those in FIG. 4A, they have the same functions. In the present embodiment, the case where the LCP is injected from one location in the horizontal direction is shown, and the spacer 1-2 has a shape in which each part is integrated as shown in FIG.
Since CP has good fluidity, such an injection method is also possible. Next, as shown in FIG. 7B, after the mold 18 is moved in the manner indicated by the arrow, the injection portion LCP1-2-1 is removed with a cutter or the like. This is shown in FIG.

FIG. 9A is a sectional view when the spacer 1-2 is put in a panel, and FIG. 9B is a front view thereof.
FIG. 1 shows an example in which the image forming apparatus includes a rear plate 5, an injection-molded spacer 1-2, a support frame 6, and a face plate 2.

In this case, the heights of the vertical and horizontal spacers 1-2 are made different with irregularities, so that even when the inside of the panel is evacuated, it can be pulled uniformly. Further, since the vertical and horizontal spacers 1-2 are connected, the strength is improved as compared with the case of only vertical or horizontal, and the spacer 1-2 is improved.
There is also an effect that the total cross-sectional area can be reduced. Furthermore, when injected from the lateral direction, the linear expansion coefficient of the LCP in the flow direction is 0.8 × 10 ⁻⁵ / ° C., which is equivalent to that of the rear plate 5 (blue plate glass). This indicates that the rear plate 5 and the spacer 1-2 do not shift or float even after the panel has undergone various heat processes, which greatly contributes to an increase in panel yield.

The sectional view of FIG.
As shown in the front view of (b), instead of arranging the spacer 1-2 on the entire surface of the panel, the above-described LCP injection process can be performed several times on one rear plate 5. is there. This is because the positional accuracy of the wiring appears in a small area, but when the size of the panel is increased (for example, 40 inches), errors in the positional accuracy are accumulated. Therefore, the positional accuracy of the wiring cannot be obtained at the ends of the panel. In such a case, if the spacer that supports the atmospheric pressure is injected several times in a narrow range on the rear plate by injection molding, a spacer that exactly overlaps the wiring can be made. is there.

[Embodiment 3] FIG. 11 shows a case where spacers are independently molded one by one. FIG. 11A is a sectional view, and FIG. 11B is a front view. In this case, the gap between the spacers 1-3 becomes large, so that when the inside of the panel is evacuated, it becomes easy to draw. Also, spacer 1-3
However, even when the electrons are charged up by the secondary electrons and the electrons from the electron beam are bent, the influence is remarkably reduced as compared with the plate-shaped spacer, and the level becomes almost negligible. In this case, the spacer 1-3 is molded by vertically injecting LCP from above, and the injection molding machine according to the first embodiment can be used. In this case, the linear expansion coefficient of the spacer 1-3 in the direction perpendicular to the flow direction is 2.2 × 10 ⁻⁵ / ° C. However, since the installation area of the spacer 1-3 is small, the heat process for the rear plate 5 is performed. There is also an effect that no deviation or peeling occurs in the inside.

[Embodiment 4] FIG. 12 (a) shows a configuration in which a projection is left on the upper portion of the spacer 1-4 on which the LCP is formed, and a groove is formed in a portion of the face plate 2 opposed thereto. With such a configuration, positioning with respect to the spacer 1-4 and the rear plate 5 becomes easier. In addition, since the spacer 1-4 is inserted into the perforated portion of the face plate 2, the panel becomes resistant to vibration and impact even after the product is completed, even after the product is completed. The spacer no longer slips or falls. Also, the effect can be obtained in the same manner even if the face plate is not formed with a groove, but the protrusion 19 is formed by printing or the like and the spacer 1-4 is held as shown in FIG. 12B. . Further, the projection 19 may be made of LCP.

In the above-described embodiment, examples of spacers having specific shapes are shown. However, other shapes to be injection-molded include, for example, each electron source or a plurality of A space may be provided in a matrix or a line in accordance with the electron source described above, and may be set as appropriate.
The effect of using the spacer becomes remarkable as the size of the display device increases.

[0070]

As described above, the following effects can be obtained by using the spacer of the present invention.

(1) Since heat resistance is obtained by using LCP as a spacer material as the spacer material, it is possible to sufficiently withstand the frit step and the baking step. The released gas rate in the vacuum of the LCP was very small at 1.3 × 10 ⁻⁵ Pal / cm ² sec or less, and the effect of extending the life of the display device was also recognized.

(2) By performing the manufacturing method by the injection molding method as the manufacturing method, a thinner spacer and a higher spacer can be easily produced in large quantities at low cost.

(3) As a display device, a spacer manufactured by such a method is used for a display device using a cold cathode type electron-emitting device such as a surface conduction type electron-emitting device. This has the effect of making handling easier and significantly improving assembly performance. As a result, there is an effect that the process can be shortened and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a display device according to a first embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a phosphor according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing an injection molding method according to an embodiment of the present invention.

FIG. 5 is a plan view of a member used for an injection molding method according to an embodiment of the present invention.

FIG. 6 is a sectional view and a plan view showing an injection molding method according to an embodiment of the present invention.

FIG. 7 is a sectional view showing an injection molding method according to an embodiment of the present invention.

FIG. 8 is a plan view formed by an injection molding method according to an embodiment of the present invention.

FIG. 9 is a cross-sectional view and a plan view formed by an injection molding method according to an embodiment of the present invention.

FIG. 10 is a cross-sectional view and a plan view formed by an injection molding method according to an embodiment of the present invention.

FIG. 11 is a cross-sectional view and a plan view formed by an injection molding method according to an embodiment of the present invention.

FIG. 12 is a sectional view showing an embodiment according to the present invention.

FIG. 13 is a schematic view of the shape of a spacer that can be used in the present invention.

FIG. 14 is a diagram showing a configuration of a conventional display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 spacer 2 face plate 3 surface-conduction electron-emitting device 5 rear plate 6 side wall 7 plunger 8 torpedo 9 heater 10 heating cylinder 11 nozzle 12 sprue 13 heater 14 injection groove 15 injection hole 16 injection hole 17 cavity 18 mold 19 Projection

Claims (11)

[Claims] 1. A spacer against atmospheric pressure provided in a vacuum vessel comprising a face plate and a rear plate, wherein the spacer is formed directly on the face plate or the rear plate by injection molding. 2. The spacer of claim 1, wherein said spacer comprises a molten liquid crystal polymer. 3. The method according to claim 1, wherein the spacer is formed in a tapered shape by the injection molding at a position where the face plate or the rear plate is formed.
Or the spacer according to 2. 4. The spacer according to claim 1, wherein the spacer is formed in a tapered shape by the injection molding at a position where the rear plate is formed, and has a projection inserted into a portion where the face plate is formed. Item 4. The spacer according to any one of Items 1 to 3. 5. A substrate in which a plurality of cold cathode type electron-emitting devices are formed in a peripheral device having a vacuum inside, an image forming member for forming an image by irradiating an electron beam emitted from the electron-emitting devices, A display device comprising: a spacer for supporting an outer container; wherein the spacer is formed directly on the substrate or the image forming member by injection molding, and the spacer is made of a molten liquid crystal polymer. . 6. The display device according to claim 5, wherein said cold cathode type electron-emitting device is a surface conduction type electron-emitting device. 7. The display device according to claim 5, wherein an electrode of the cold cathode type electron-emitting device is connected to a row wiring and a column wiring, and the spacer is the row wiring or the column wiring. A display device characterized by being injection-molded thereon. 8. A method for producing a spacer against atmospheric pressure provided in a vacuum vessel comprising a face plate and a rear plate, wherein the rear plate is dried and the temperature of a nozzle of an injection molding machine is injected. The temperature of the cylinder containing the liquid crystal polymer is set higher than that of the cylinder, and the molten liquid crystal polymer is injected into the mold on the rear plate at a high injection speed of 95 to 98% of the entire stroke of the cylinder. A method for manufacturing a spacer, comprising: injecting the remaining residue at a low injection speed. 9. A nozzle of the injection molding machine is disposed on a plane side of a rear plate, and cuts the liquid crystal polymer at an injection portion from the nozzle after removing a mold after injection molding. 9. The method for manufacturing a spacer according to item 8. 10. The method according to claim 8, wherein the spacer has a flat shape or a cylindrical shape. 11. An electron-emitting device is formed on the rear plate, an electrode of the electron-emitting device is connected to a row wiring and a column wiring, and the spacer is formed on the row wiring or the column wiring. The method for manufacturing a spacer according to claim 8, wherein the spacer is injection-molded.