Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Reexamination Certificate
1997-10-21
2001-03-13
Silverman, Stanley S. (Department: 1731)
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
C065S033200, C065S036000, C065S060300, C065S060100, C065S060800, C427S096400, C427S383500, C427S428010
Reexamination Certificate
active
06199404
ABSTRACT:
FIELD OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to a gas discharge type display panel and a manufacturing method for the same. The present invention further relates to a displaying arrangement which employs the gas discharge type display panel. The present invention relates, more particularly, to the formation of barrier ribs for isolating the address electrodes on a back substrate of the gas discharge type display panel from each other.
In general, a gas discharge type display panel is provided with a front substrate and a back substrate disposed to cooperate with the front substrate to define a discharge space therebetween. The back substrate is provided with a glass plate, a plurality of address electrodes formed on the glass plate in parallel to each other, barrier ribs formed among the address electrodes, which maintain a gap between the front substrate and the back substrate as well as isolate luminous regions of red, green and blue colors, and a fluorescencer applied to the interiors of the cells defined by the barrier ribs and the side surfaces of the barrier ribs.
The barrier ribs are usually formed using a stacking method or a engraving method.
In the former method, a glass paste is repeatedly printed on a predetermined portion of the glass plate, using a mask screen, thereby obtaining the barrier ribs of desired dimensions. In the latter method, a layer of a glass paste of determined dimensions is formed on the entire surface of the glass plate. The glass paste is removed from all portions other than the portions corresponding to the barrier ribs by sandblasting so as to obtain the barrier ribs of the predetermined dimensions.
These methods require long time to form the barrier ribs and a glass paste cannot be used effectively.
As another means for forming the barrier ribs, there is a replication method disclosed in JP-A-8-273538. According to the replication method, a flat stamper is prepared, which has a complementary configuration of a barrier rib array. After of a glass paste is applied onto the entire surface of the glass plate in a thin layer, the stamper is pressed against the glass paste to transfer the pattern onto the glass paste. The glass paste is cured, and then the stamper is removed therefrom.
In the replication method, the stamper is flexible so that it can be easily removed from the rigid glass plate. The stamper is gradually removed from an edge of the glass plate. If the stamper is rigid, then it would require a large force to peel off, at one stroke, the rigid stamper from the glass plate, which is in surface contact with the rigid glass plate. This may cause damage to the stamper due to high stress produced in the stamper.
The flexible stamper is fabricated by forming a die made of a polymer material applied on a polymer base film. Most polymer materials are easily deformed by external force or heat. Therefore, the stamper elastically deforms under a pressing force when it is pressed against the thin layer of the glass paste which has been applied all over the surface of the glass plate. For this reason, the forming accuracy of the barrier ribs is not high. Furthermore, when the stamper plastically deforms due to the heat for curing the glass paste or due to other reason, the required forming accuracy for the barrier ribs can no longer be obtained, so that the stamper has to be frequently replaced by a new one.
Thus, the flexible stamper has problems in that the barrier rib forming accuracy is not satisfactory and the service life is limited, making it unsuited for the mass production of display panels. Besides, the manufacturing cost of the display panels becomes high.
Furthermore, on forming the barrier ribs arranged in a grid pattern, it is necessary to provide the barrier rib with a large taper to readily remove the stamper from the glass plate. However, provision of such a large taper makes it difficult to narrow the gaps among the barrier ribs. A display panel with higher resolution cannot be obtained.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide a manufacturing method for a display panel which solves the problems described above.
To this end, according to the present invention, there is provided a manufacturing method for a gas discharge type display panel comprising the steps of applying a glass paste to a substrate on which electrodes have been formed, of rotating a roll, on which grooves corresponding to barrier ribs have been formed, in order to form the glass paste applied to the substrate into barrier rib blanks, and of sintering the formed barrier rib blanks to obtain barrier ribs.
The present invention will now be described in detail in conjunction with embodiments thereof with reference to the accompanying drawings.
REFERENCES:
patent: 4280939 (1981-07-01), Johnson
patent: 5853446 (1998-12-01), Carre et al.
patent: 50-152661 (1975-12-01), None
patent: 51-30861 (1976-03-01), None
patent: 8-273538 (1996-10-01), None
patent: 9-283017 (1997-10-01), None
Ijuin Masahito
Kaneto Osami
Kato Yoshihiro
Kawai Michifumi
Murase Tomohiko
Antonelli Terry Stout & Kraus LLP
Colaianni Michael P.
Hitachi , Ltd.
Silverman Stanley S.
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