Short-flow path high-yield production method of cold cathode MO cup

Abstract

The invention provides a short-flow high yield fabrication method of a cold cathode Mo cup, belonging to a deep small blind hole processing method of Mo material. Mo silk with purity more than 95% is taken as raw material, and the back light source Mo cup is processed by one of the processing techniques of electron beam, laser beam and electric spark small hole. Compared with the extensile forming process of currently used mirror surface Mo sheet, the price of raw material is low, the equipment is simple, the production flow is sort, the yield and the surface smoothness are high, and microstructures are controllable. The short-flow high yield fabrication method of a cold cathode Mo cup is applied to the processing method of back light source component fluorescence lamp cold cathode Mo cup in slab display and corresponding industries.

Description

Technical field [0001] The invention relates to a short-flow, low-cost, and high-yield production method for a cold cathode backlight source Mo cup electrode for flat panel display. Background of the invention [0002] Large-size flat panel displays, especially TFT-LCD displays, have become the focus of development and have become the mainstream of the market. The backlight module is an indispensable key device for TFT-LCD displays, and it occupies an important position in the cost composition of liquid crystals. The cold cathode fluorescent lamp (CCFL) backlight is the current mainstream product. Except for a few small-sized products such as mobile phones, it has an absolute majority of the market share in most LCD fields. The cold cathode is a vital component in CCFL. Studies have shown that the cold cathode Mo cup electrode has better emissivity and sputtering resistance than the commonly used Ni cup electrode. Substituting Mo with a lower working coefficient for Ni can incr...

AI Technical Summary

Problems solved by technology

Domestically, due to the quality of raw materials and equipment, it is not yet possible to extend the production of backlight cold cathode Mo cups.

[0004] From Mo powder raw material to mirror Mo sheet, it needs to go through multiple processes such as powder pressing into slab, slab sintering, billet rolling, repeated forming rolling, vacuum annealing, polishing, etc. The yield of rolled material is only 50%, High energy consumption, lengthy production process, high cost, large investment in equipment for rough and finish rolling mills of various specifications, and huge workload for equipment maintenance

From the mirror surface Mo sheet to the backlight cold cathode Mo cup product, it needs to go through the drawing molding process, and the drawing equipment investment is huge, and the Mo cup yield is very low (only 80~90%)

In addition, there is a draft taper on the cylindrical surface of the product, and it does not fit well with the inner wall of the CCFL lamp tube; there are obvious signs of plastic deformation on the inner surface, and the finish is not good