Patent Application
20090015132
1. Field of the Invention
The present invention relates to a field emission display, and in particular to a leads arrangement of a field emission display having a package side frame.
2. Description of Prior Art
In recent years, since carbon nanotube has an excellent efficiency of generating electrons, it is widely applied to a cathode electron-emitter in a field emission flat panel display. In comparison with other types of flat panel displays, the filed emission flat panel display has a better brightness, a wider viewing angle, low energy consumption and rapid response, so that it has become more and more important and well-developed.
The most common structure of a filed emission flat panel display is constituted of a cathode plate and an anode plate. The cathode plate and the anode plate have a cathode substrate and an anode substrate respectively. A package side frame is provided between the cathode substrate and the anode substrate to block a vacuum region formed therein. The cooperation of an electric field generated in the internal vacuum region provides a space and power for accelerating free electrons ionized by the carbon nanotube. Finally, the free electrons collide with a fluorescent layer provided on the anode plate to generate a light.
In the above-mentioned structure of the field emission flat panel displayer, in order to electrically connect conductive layers on the cathode substrate and the anode substrate in the vacuum region to an external power supply, there are two conventional common ways. One way is to lay electrode leads on the cathode substrate and the anode substrate. When the cathode substrate and the anode substrate are connected correspondingly, they are deviated from each other so that the electrode leads provided on the cathode substrate can be exposed to the outside of the vacuum region, thereby forming a connecting region of the electrode leads for connecting to the external power supply. However, this way may reduce the efficiency of utilizing the plate material, that is, the ratio of the efficient displaying region to the whole area of the plate material is reduced. As a result, in order to generate an additional connecting region, the cathode plate and the anode plate may be asymmetrical to each other after connection, and thus it is necessary to perform a cutting process according to the demands for different sizes to assure the square shape of the panel. This causes the waste of material and thus becomes a drawback thereof.
Another way is to provide on the panel with electrode leads made of a solid metal. The leads are drawn from the interior of the vacuum region to connect with the outside and the external power supply. Although the manufacturing procedure of this solution is simpler without providing an additional connecting region and thus improves the waste of material occurred in the previous method, the diameter of the electrode lead made of a solid metal is thicker than that formed by a general screen printing. Therefore, it is unsuitable for arranging a plurality of sets of electrode leads to form a high-definition structure. Furthermore, when the electrode leads made of a solid metal pass through the package structure between the cathode substrate and the anode substrate, the difference between the materials may affect the tight connection with the substrate and thus form tiny seams, causing the leakage of air and affecting the internal vacuum environment. Therefore, in view of the drawbacks of the above-mentioned conventional art, it is important and necessary to find a better way to overcome these problems.
In view of the above drawbacks, the present invention is to provide a leading means of electrode leads of a field emission display, which is used to lead the internal electrode to the outside. By laying electrode leads on a side frame serving as a package structure to electrically connect with the internal cathode or anode electrode layer, and extending a lead plate outwardly from the side frame to lead the electrode to the outside, it is convenient to connect with an external power supply and keep the square shape of the cathode/anode substrate.
The present invention provides a leading means of electrode leads of a field emission display, which includes a cathode plate, an anode plate and a package side frame. The cathode plate is combined with the anode plate correspondingly. The cathode plate has a cathode substrate. The cathode substrate is provided thereon with a cathode conductive layer. The anode plate has an anode substrate. The anode substrate is provided with an anode conductive layer thereon. Further, the package side frame is provided between the cathode substrate and the anode substrate. A lead plate extends from one side of the package side frame. Both end faces of the lead plate are provided with a plurality of electrode leads, and a conductive layer is provided between the electrode leads and the cathode/anode substrate to electrically connect with the cathode/anode conducting layer, respectively. The extending lead plate electrically guides the cathode conductive layer and the anode conductive layer to the outside, thereby connecting to other power supply.
The technical contents of the present invention will be explained with reference to the accompanying drawings.
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Although the present invention has been described with reference to the foregoing preferred embodiments, it will be understood that the invention is not limited to the details thereof. Various equivalent variations and modifications can still occur to those skilled in this art in view of the teachings of the present invention. Thus, all such variations and equivalent modifications are also embraced within the scope of the invention as defined in the appended claims.
