Patent Application
20050088072
The present invention relates to a self-adhesive frame applied in package of field emission display. Since the self-adhesive frame can be designed as an independent component and suitable to be manufactured independently, the cathode plate and the anode plate do not need to join the process of pre-heating of the self-adhesive frame. In addition, the self-adhesive frame also has a plurality of fixing side strips for alignment of temporary fixing of the cathode plate and the anode plate. Wherein the fixing side strips do not increase the void area of the field emission display. By using the self-adhesive frame the operator can applied the special package method to increase the operation convenience to improve the property such as the slanting magnitude and simplification of heating process for package of the field emission display.
The kinds of flat panel display (FPD) includes field emission display (FED), liquid crystal display (LCD), plasma display panel (PDP), organic light emitter device (OLED), and liquid crystal projection display . . . etc. The common features of such display are thin and light weight. According to the property of every flat panel display, some of them can be applied on the small scale panel such as cellular phone, a little part of them being suitable to be applied on the medium or large scale device such as computer monitor or TV display, another application for them further comprising super large scale display device such as the outdoor digital exhibition board. But the technology of every kinds of the flat panel display all progress toward the object of high display quality together with large scale display and raising the duration life for application.
A new technology of carbon nanotube field emission display (CNT-FED) has the opportunity to have all the progressive property of the above-mentioned features. Please refer to the
Thus from the above mentioned field emission display, the mentioned vacuum environment is established by the packaged of the cathode plate 122 and the anode plate 120 to draw out the air to form a vacuum region or a so-called package region 112. The vacuum degree in the vacuum sealing region is at least from 10−6 Torr to cause the residual air not interfering the field emission electrode. The vacuum degree should prevent the plasma generation to reduce the efficiency of light radiation and the reducing of duration life of the carbon nano tube.
Regarding the conventional art, for reaching the purpose of vacuum package, a kind of special glass glue with chemical bonding ability in high temperature is needed. The two process of high temperature treatment is required. The first treatment is called the pre-heating and by the temperature of 350 to 400 centigrade to oxidize the organic solvent in the glass glue. The second treatment is called fritting and by the temperature of 440 to 480 centigrade to cause the chemical bond for forming the larger molecules to ensure the sealing property and the connection strength. Thus the said glass material for chemical bond in the high temperature should have the property of certain bonding strength, no residue of volatile gas, low generation of dust. But during the heating process, the many internal material inside the cathode plate and the anode plate such as the electrical source 104 of the carbon nanotube, gas seal material and phosphors powder 102 should sustain two times of the process of high temperature. The high temperature may usually cause an effect to the property and quality of internal material. So the inventor think the problem how to reduce the times of high temperature treatment to the cathode plate and the anode plate to reduce the uncertainty factor to the property and quality of internal material.
The
In the process of package, first step is to spread the glass glue 108 on the alignment marked location of top base glass plate 100 for the glass side strip 106, then the operator place the glass side strip 106 on the alignment marked location. Through the first pre-heating to fix the glass side strip 106 on the top base glass plate 100, the operator should spread the glass glue 108 on another surface of the fixed glass side strip 106 to proceed to one more pre-heating process to oxidize the organic solvent in the glass glue 108. The following step is to proceed to the temporary fixing by a kind of certain UV glue for the bonding of the bottom base glass plate 110 and the top base glass plate 100 through alignment. The purpose of the said temporary fixing is to keep the precision to prevent the distortion. The general application for temporary fixing is applied by the UV glue.
After the temporary fixing, the operator apply a kind of the fixing tool to fix the cathode plate 122 and the anode plate 120, proceeding to high temperature heat treatment as fritting. Thus the connection of the glass side strip 106 between the bottom base glass plate 110 and the top base glass plate 100 will be formed. But the UV glue will be decomposed in the high temperature treatment to pollute the glass glue. So the location of UV glue for the temporary fixing will be arranged as far as possible from the location of glass glue.
After the package of the bottom base glass plate 110 and the top base glass plate 100, the operator will proceed the vacuum pumping and sealing. Since the operation environment of the field emission display require the vacuum degree of 10−6 Torr, the operator will apply a kind of gas getter material as chemical pump to increase the efficiency of gas pumping and to catch the escaping air, the life of vacuum being extended by the said gas getter material. Sum up the prior art, though the art can reach the vacuum package, the remained problems is occurred such as hard control to distortion by the fixing tool at the period of heat treatment. This distortion is very hard to control between the cathode plate 122 and the anode plate 120.
Further, please refer to the other prior art as described in the
1. The operation bottleneck is high.
(1) The fixing area of UV glue for temporary fixing is reduced.
The cathode plate 122 and the anode plate 120 should be applied temporary fixing after alignment. But the groove 212 between the two U shape glass side strip 204, 206 is for filling the glass glue. Thus the packing area and the sealing area for glass side strip 204, 206 are enlarged. This is just opposite to the requirement of common product that the effective area and picture area should be large and the void area and non-picture area should be small. This condition is also lead to the fixing area of UV glue for temporary fixing hard to be executed by lacking of void area.
(2) The times of alignment for package is increased together with the complexity of process being increased.
Since the U shape glass side strips 204,206 should be aligned and fixed on the cathode plate 122 and the anode plate 120 respectively, the cathode plate 122 and the anode plate 120 proceeding to align and to temporarily fix, the groove 212 between the two U shape glass side strips 204,206 being necessarily kept in a uniform distance, consequently the complexity and the hardness are increased.
(3) The process of glue spreading is more complex
The dimension of the two U shape glass side strips 204,206 are different. So the process of glue spreading are executed respectively. The additional process to spread glue in the groove 212 between the U shape glass side strips 204,206 is the third glue spreading process. Thus the complexity of process and the equipment cost are raised.
2. The times for the cathode plate 122 and the anode plate 120 to enter into the heat treatment device are increased
Since the organic solvent of the glass glue should be oxidized, the pre-heating process is necessary after the spreading of the glass glue. But many kinds of material will be coated on the cathode plate 122, the anode plate 120 and the gas getter fixing region. These kinds of material have limited restriction to the high temperature process. Thus the more times of high temperature treatment will cause more restrictions to the selection of the coated material on the cathode plate 122 and the anode plate 120. The art described here will cause a more pre-heating and more fritting region. The risk of the manufacturing process is increased.
For the above mentioned, the inventor design a self-adhesive frame applied in package of field emission display to resolve the above mentioned problems. Please refer to the below description.
1. Raise the operation convenience
(1). The present invention can provide a fixing side strip 402 for the UV glue to establish the temporary fixing. Further function can be shown in the fritting in high temperature by the reason of enough interfering distance between the UV glue and the glass glue 108. So the UV glue will not pollute the glass glue at the decomposition period to prevent the leakage of inner vacuum environment.
(2). The present invention can provide the function of reducing the accuracy requirement or complexity of the alignment.
(3). The present invention can apply the independent manufacturing. After the manufacturing process, the operator can introduce the independent component into the alignment process of the cathode plate 122 and the anode plate 120. Thus the glue spreading process can be reduced.
Reducing the times of heat treatment in high temperature for the cathode plate 122 and the anode 120.
The present invention can apply the temporary fixing to the cathode plate 122, the anode plate 120, and the gas getter to attach to a predetermined location from alignment. Thus the one time for heat treatment of fritting with pressing fixing is executed.
3. The distortion after the temporary fixing can be improved
Since the prior is easily to generate the problem of nonuniform high of glue spreading. This condition will cause the displacement action between the cathode plate 122 and the anode plate 120. Thus the glass glue will generate the slipping condition in the heat treatment of high temperature by the nonuniform pressing fixing. In the contrary, the present invention has the high uniformity at the package surface can overcome the problem of nonuniform high of glue spreading.
From the second prior art having the function to resolve the shortage of the first prior art. But the second prior art still generate the problem of hard operation convenience and too small in picture area. The inventor then designs a kind of a self-adhesive frame having the benefit of high operation convenience together with large region of picture area. In addition, the cathode plate 122 and the anode plate 120 only require one time of fritting process. The present invention contains many benefits.
The main purpose of the present invention is to provide a structure suitable to the current manufacture process and low operation cost to provide a effect of low cost with high quality. The present invention is to provide a self-adhesive frame to overcome the increasing of void area and provide a effect usage of temporary fixing. In addition, provide a package process for the cathode plate 122 and the anode plate 120 to reduce the alignment error and the distortion occurred in the fritting.
The other purpose of the present invention is to provide a manufacturing method for a self-adhesive frame. From the method can define the self-adhesive frame as a single package component. The self-adhesive frame can be independently manufactured away from the main production line. The pre-heating and the glue spreading on the cathode plate 122 and the anode plate 120 can be avoided. The present invention can reach the effect of reliability and clean level.
The extra purpose of the present invention is to provide a package method by applying the self-adhesive frame to the area of field emission display. The method can simplify the conventional alignment method of the cathode plate 122 and the anode plate 120 and reduce the times of heat treatment in package. Thus the shortage of heat treatment of high temperature can be reduced to prevent to reach the restriction of the coating material to extend the application range of the coating material.
From the above mentioned many purpose, the inventor provide a kind of self-adhesive frame and the package method by the same, from the present invention gathering many benefits for application. In addition, many other benefits can be clearly found after the skilled person having referred to the attached figures and the below description.
The present invention comprises: a main body frame having the cathode plate sealing surface and the anode plate sealing surface; and a fixing side strip extending from the outer side of the main body frame; wherein the cathode plate sealing surface and the anode plate sealing surface have been spread a coating of glass glue, the self-adhesive frame being treated by a heat treatment in high temperature; wherein the fixing side strip has a predetermined glue spreading area for the temporary fixing with the cathode plate 122 and the anode plate 120.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:
Please refer to the
The said self-adhesive frame 404 has its own structure and manufacturing method being shown in the
Base on the features of the self-adhesive frame 404, hereby provide a practical embodiment of package method by using the self-adhesive frame 404 on the field of field emission display. Firstly make alignment mark on the cathode plate 122 and the anode plate 120 and the mark is relative to the self-adhesive frame 404, the marked condition being general shown as the
The structure of the self-adhesive frame 404 of the present invention should be described here and it comprises: a main body frame 401 having the cathode plate sealing surface and the anode plate sealing surface; and a fixing side strip 402 extending from the outer side of the main body frame 401. Wherein the cathode plate sealing surface and the anode plate sealing surface have been spread a coating of glass glue 403, the self-adhesive frame 404 being treated by a heat treatment in high temperature. Wherein the fixing side strip 402 has a predetermined glue spreading area for the temporary fixing with the cathode plated 122 and the anode plate 120. Wherein the cathode plate sealing surface and the anode plate sealing surface are the top surface and bottom surface of the main body frame 401.
The variation of self-adhesive frame 404 will be described in the below. At the condition of temporary fixing, the self-adhesive frame 404 mates with the cathode plate 122 and the anode plate 120 in the position relationship that the fixing side strip is located at the same side of the cathode conductor 501 or the anode conductor 601. In addition, the shape of the main body frame can be design as rectangular. In general, the cathode plate sealing surface and the anode plate sealing surface are parallel mutually for the operation of field emission display. For low cost and convenience, the spreading action of glass glue 403 to the cathode plate sealing surface and the anode plate sealing surface can be by screen printing.
The manufacturing method of self-adhesive frame 404 applied in package of field emission display in the present invention, which comprise the steps of: (1) manufacturing a main body frame 401 and at least a fixing side strip 402; wherein the main body frame 401 has the cathode plate sealing surface and the anode plate sealing surface; wherein the fixing side strip 402 extending from the outer side of the main body frame 401; (2) by screen printing or glue dropping device to spread the glass glue 403 on proper positions of the cathode plate sealing surface and the anode plate sealing surface, by using the planar working to cause the planarization of the spread surface of the proper positions, (3) heating the semi manufactured article in (2) as 350-400 centigrade to cause the oxidization of organic solvent in the glass glue 403 to finish the self-adhesive frame.
The package method for field emission display using the self-adhesive frame 404 of the present invention, which comprising the steps of: (1). firstly making alignment marks on a cathode plate 122 and a anode plate 120 respectively for positioning of the self-adhesive frame 404; (2). secondly spreading the UV glue on the sealing surface of the cathode plate 122 and the sealing surface of the anode plate 120 of the fixing side strip 402 of the self-adhesive frame 404; (3). by an alignment process to fix the self-adhesive frame 404 on the location of alignment marks of the cathode plate 122 and the anode plate 120; (4). using the UV source to irradiate on the location of UV glue to solidify the UV glue to finish a temporary fixing; (5). applying a clipping device on the article of temporary fixing in (4) to proceed to send the article of temporary fixing into a stove to use 420 to 500 centigrade to melt the glass glue 403, finished the package.
From the above mentioned, we can recognize the features of the self-adhesive frame 404. Especially using the package method on the field emission display can obviously promote the yield rate and reduce the difficulty of manufacturing. The various benefits are from the features of the invention.
Although the present invention has been described with reference to the preferred embodiment thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have suggested in the foregoing description, and other will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.
