Preparation for vacuum fluorescent displaying device without discharge pipe

Abstract

The feature that the filament completes decomposition of constant current k in vacuum furnace is: for 0.8-1.0 v / cm filament, the range of added constant current I is between 38.28-43.72 mA; the temperature of tungsten filament Tw is 981-1099deg.C; The temperature of carbonate Tk is 905-1015.

Description

technical field [0001] The invention relates to a preparation process of a vacuum fluorescent display, in particular to a preparation process of a vacuum fluorescent display without an exhaust pipe decomposed by a constant current. Background technique [0002] Vacuum Fluorescent Display VFD (Vacuum Fluorescent Display) is developed from a vacuum tube. It uses a phosphor to emit light when it is bombarded by electrons. It is a self-luminous display device. Because it is easy to do multi-color display, can be driven by low voltage, has good compatibility with semiconductors, and has high reliability, it is widely used in various electronic products. The existing vacuum fluorescent display products have to go through a K decomposition process in the preparation process. The so-called K decomposition refers to applying a voltage to both ends of the filament of the vacuum fluorescent display to heat the filament, and the carbonate on the filament i...

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Problems solved by technology

However, due to the limitations of the process conditions, there are inherent deficiencies in the exhaust pipe vacuum fluorescent display: first, the exhaust pipe is located at the edge of the VFD product, and the exposed and protruding exhaust pipe is vulnerable to collision during packaging, transportation and product assembly , resulting in the rupture of the exhaust pipe and the scrapping of the entire product

Vacuum fluorescent displays without exhaust pipes are produced by punching holes in the substrate glass. The preparation process is more difficult than the direct exhaust preparation technology of vacuum fluorescent displays with exhaust pipes. It is mainly reflected in: 1. Vacuum fluorescent displays without exhaust pipes The product needs to be decomposed by K at a temperature of about 330 degrees in the exhaust furnace. At high temperature, carbon scale will form between the Pin and the brush. The carbon scale will increase the contact voltage between the brush and the Pin, resulting in voltage loss and filament damage. K decomposition cannot be carried out; 2. The filament of the vacuum fluorescent display is composed of tungsten filament and carbonate, and there is an organic binder on the filament for adhering the carbonate. When K is decomposed, these components are decomposed by heat and emit more carbon dioxide gas , the K decomposition spreads greatly, and the fluctuation of many factors will seriously affect the quality of the product

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