JPS6220864Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to display devices such as external electrode type discharge display devices, internal electrode type discharge display devices, and fluorescent display devices, and particularly to electrode structures for applying voltage to these display devices.

The electrode groups of these display devices are formed by silk screen printing with a paste of silver or other precious metals, etc., and are drawn out into the margin of the envelope of the display board through the seal part of the envelope. Thereafter, in order to apply a voltage from the outside, measures such as soldering a lead wire or the like in the blank area or inserting the lead wire without soldering into a socket or the like have been taken.

However, in these structures, when silver paste is used, for example, it is sensitive to the atmosphere in the margins of the envelope, especially humidity, and if left for a long time or voltage is applied, it may cause migration or electrolysis. There were cases where reliability was lacking, such as the occurrence of errors such as mislabeling. For this reason, there is a method of using a paste of a noble metal such as gold, which is relatively stable compared to silver, but it has the disadvantage of being extremely expensive. In order to improve this drawback, we conducted an experiment in which the electrode groups inside and outside the envelope were formed in one silk screen print using nickel paste, which is inexpensive and has good stability in air. A drawback was discovered that air leaked into the envelope through this nickel paste film. The reason for this is thought to be that after the nickel paste is fired, the nickel grains and the glass frit contained as a binder do not mix well with each other, resulting in a slightly porous composition, resulting in leakage through the grain boundaries between the nickel grains and the glass frit.

The present invention provides a display device that eliminates the above-mentioned drawbacks, and will be described in detail below with reference to the drawings.

The figure is a sectional view showing one example of an external electrode type discharge display device in which the present invention is specifically implemented. 1 and 2
3 is an insulating plate made of glass or the like, 3 is an electrode on which silver paste is baked, 4 is a dielectric layer covering the electrode 3, 5 is an electrode on which nickel paste is baked, and 6 is a sealing part.
In the figure, the electrode 3 on which silver paste is baked and the electrode 5 on which nickel paste is baked are connected in the sealed part 6 in the figure. This structure has the advantage that it is inexpensive, has good compatibility with the frit glass that is the material of the sealing part 6, and has no leakage because the silver paste electrode part is inside the sealing part.
Since the electrodes in the margins of the envelope are made of nickel, which is stable in the air, there are no drawbacks such as migration or electrolysis when left for a long time or when voltage is applied. This advantage further enables one-touch connection and disconnection of the display device and external circuit through the connector.

As described above, according to the present invention, it is possible to obtain a display device that operates stably using inexpensive electrode materials. Note that the above-mentioned example is not limited to external electrode type discharge display devices, but extends to all display devices having means for applying voltage through an envelope.

[Brief explanation of the drawing]

The figure is a sectional view of one embodiment of the present invention. 1,
2 is an insulating plate, 3 is a silver paste baked electrode, 4 is a dielectric layer, 5 is a nickel paste baked electrode, and 6 is a sealing part.

Claims (1)

[Scope of utility model registration request] In a display device having an airtight envelope and an electrode group for displaying characters, numbers, etc., the electrode group inside the envelope is constituted by baking silver paste, and an electrode for applying a voltage to this electrode group. The electrode group is formed by firing the nickel paste, and one end of the electrode group formed by firing the silver paste and one end of the electrode group formed by firing the nickel paste are placed inside the sealing part of the envelope so that they do not protrude from inside the sealing part of the envelope. A display device characterized by electrical contact.