The present invention relates to an electrode plate for field emission display, and in particular to a electrode pattern formed on the electrode plate for field emission display.
Recently, the light-weight, thinner, shorter and smaller flat panel display is widely used for replacing the traditional bulky cathode ray tube (CRT) display. Accordingly, the flat panel display technology is becoming one of the most important optoelectronic technology in the recent years. In the variety of flat panel display technologies, the liquid crystal display is one of the most popular display technology. However, since the liquid crystal display is not a self-illuminated device, an additional light source is needed for serving as the backlight of the liquid crystal display. Nevertheless, the backlight module of the liquid crystal display is not only a very complicated assembly but also has troubles in brightness degradation and in heat dissipation especially when it is scaled up for the LCD TV.
The field emission display is one of the promising display technology for the next generation flat panel display. Unlike the liquid crystal display having the complicated and the costly backlight module, the field emission display is not only self-illuminated but also has the excellent brightness and color quality approaching the traditional CRT display. While the display quality of the field emission display is approaching the traditional CRT display, the driving voltage of the field emission display is much lower than that of the CRT display. Furthermore, the fluorescent material used for field emission display has a wider operation environment over the liquid crystal material used for LCD. Thus, the field emission display holds the promise for the next generation flat panel display.
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Furthermore, please refer to FIGS. 2(A) and 2(B) which respectively shows the top view diagram of the anode and the cathode plates of the field emission display according to the prior art. As shown in FIGS. 2(A) and 2(B), both the anode and the cathode plates 10, 20 can be divided into an active region 10a, 20a, and a non-active region 10b, 20b. Generally, the electrode arranged in the respective active regions 10a, 20a of the anode and the cathode plates 10, 20 is dense and regular patterned, as shown in the scaled up diagrams presented in the right side of FIGS. 2(A) and 2(B), while the electrode existing in the non-active region is usually arranged sparsely or even patterned into an asymmetric hollow electrode or an asymmetric block electrode having no vacant space formed therewithin. This is because that the electrode existing in the non-active region is only used for electrical connection purpose or for placing getter for retaining the vacuum state of the field emission display.
Since the patterns existing in the non-active regions 10b, 20b are usually asymmetric, a stress concentration effect may easily occurs thereon during the high temperature process of the anode and cathode plates 10, 20. Moreover, since the patterns existing in the non-active regions 10b, 20b are totally different from those existing in the active regions 10a, 20a, the stress concentration effect will become serious in the boundary between the non-active regions 10b, 20b and the active regions 10a, 20a. Accordingly, when the stress concentration phenomenon occurs, the glass substrate 12, 22 of the anode or cathode plate 10, 20 crack easily in the sequential process of the anode and cathode plates 10, 20. Although it is well known that the stress concentration phenomenon can be eliminated by a further annealing process, the possible deformation problem caused from the asymmetric pattern in the non-active region 10b, 20b still cannot be overcome through the annealing process. Furthermore, the additional process time and cost for annealing process make it not applicable for manufacturing the anode and cathode plates 10, 20 of the field emission display. Therefore, it is necessary to develop a new technique for abating or eliminating the deformation and the stress concentration effect in the non-active region of the anode or cathode plate for the field emission display.
It is a first aspect of the present invention to provide a novel electrode plate for a field emission display. The electrode plate includes an active region having thereon an electrode layer and a non-active region having thereon a dummy electrode. The dummy electrode further has a material which is also used for the electrode layer.
Preferably, the electrode plate is one of an anode plate and a cathode plate for the field emission display.
Preferably, both the electrode layer and the dummy electrode are patterned electrodes.
Preferably, the dummy electrode has a pattern equivalent to what the electrode layer has.
Preferably, the dummy electrode has a block pattern having no vacant space formed therewithin.
Preferably, the dummy electrode has a network pattern.
Preferably, the dummy electrode has a process line width equivalent to what the electrode layer has.
It is a second aspect of the present invention to provide a novel electrode plate for a field emission display. The electrode plate includes an active region having thereon an electrode layer and a non-active region having thereon a dummy structure. The dummy structure further has a coefficient of thermal expansion approximately equivalent to what the electrode layer has.
Preferably, a difference between a coefficient of thermal expansion of the dummy structure and that of the electrode layer is less than 10−5/° C.
Preferably, the electrode plate is an anode plate for the field emission display.
Preferably, the electrode layer further comprises a transparent electrode and a wiring electrode.
Preferably, the dummy structure has a material which is also used for manufacturing the electrode layer.
Preferably, both the electrode layer and the dummy structure have patterned structures.
Preferably, the dummy structure has a patterned structure equivalent to what the electrode layer has.
Preferably, the dummy structure has a block patterned structure having no vacant space formed therewithin.
Preferably, the dummy structure has a network pattern.
Preferably, the dummy structure has a process line width equivalent to what the electrode layer has.
Preferably, the dummy structure is a dummy electrode which is free from being electrically connected.
Preferably, the electrode plate is a cathode plate for the field emission display.
It is a third aspect of the present invention to provide a novel method for manufacturing an electrode plate of a field emission display. The method includes the steps of (1) providing a substrate; (2) defining an active region and a non-active region on the substrate; and (3) respectively forming a dummy structure and an electrode layer on the active region and the non-active region.
Preferably, the dummy structure and the electrode layer are patterned with the same process.
Preferably, the dummy structure and the electrode layer are respectively patterned with different processes.
The above objects and advantages of the present invention will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed descriptions and accompanying drawings, in which:
FIGS. 2(A) and 2(B) are the top view diagrams of the anode and the cathode plates of the field emission display according to the prior art;
FIGS. 3(A) and 3(B) are the top view diagrams of the anode and the cathode plates of the field emission display according to an preferred embodiment of the present invention;
FIGS. 4(A) and 4(B) shows the stress distribution diagrams of the anode plate according to the FIGS. 2(A) and 3(A), respectively; and
FIGS. 5(A) and 5(B) shows the stress distribution diagrams of the cathode plate according to the FIGS. 2(B) and 3(B), respectively.
The present invention will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purposes of illustration and description only; it is not intended to be exhaustive or to be limited to the precise form disclosed.
Please refer to FIGS. 3(A) and 3(B) which respectively shows the top view diagram of the anode and the cathode plates 10, 20 of the field emission display according to a preferred embodiment of the present invention. No matter it is the anode plate 10 or the cathode plate 20, the layer structure thereof is very similar to that shown in the field emission display structure of
Please refer to FIGS. 4(A) and 4(B), which shows the stress distribution diagrams of the anode plate according to the FIGS. 2(A) and 3(A), respectively As shown in
It should be noted that the dummy structure of the present invention can be chosen from one of the materials used for the electrode, or has a line with or pattern corresponding to what the electrode in the active region has. Accordingly, the manufacturing process of the dummy structure is totally compatible with the original process of the anode plate. In most preferred embodiments of the present invention, no additional process is added for manufacturing the dummy structure in the non-active region. Even when the dummy structure is processed in a pattern different from what the electrode layer in the active region has, the manufacturing process of the dummy structure still compatible with those original applicable for the electrode plate of the field emission display. Accordingly, the process time and cost can be controlled as usual.
While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims, which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
Number | Date | Country | Kind |
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94133403 | Sep 2005 | TW | national |