A fine metal mask manufacturing method suitable for high ppi

Abstract

The invention relates to the technical field of metal mask making, in particular to a method for making a fine metal mask suitable for high PPI. It includes the following manufacturing steps: (1) According to the arrangement of high PPI pixels, prepare the corresponding low PPI fine metal mask plate; (2) Use a netting machine to stretch the low PPI mask and weld it to the frame to form a Semi-finished fine metal mask plate, after the netting is completed, the mask is coated with PI to form a film layer; (3) Use an exposure machine to expose the semi-finished product coated with PI, that is, to define the graphics, and then develop to complete the graphics. Some large openings are processed with small openings to form a high PPI mask opening effect. In the present invention, a simple low-PPI mask product is firstly stretched, and then small high-PPI openings are formed through coating PI, exposure and development, so as to realize high-PPI mask sheet stretching. The hole opening effect of high PPI is achieved, and the problems of low yield rate, thin raw material, and difficult etching that occur when etching a high PPI mask are avoided.

Description

technical field [0001] The invention relates to the technical field of metal mask manufacturing, in particular to a method for manufacturing a fine metal mask suitable for high PPI. Background technique [0002] FINE METAL MASK (FMM) is a consumable key component in the OLED evaporation process. Its main function is to deposit RGB organic materials and form pixels in the OLED production process, accurately and finely where needed. Deposit organic materials to improve resolution and yield. In view of the high requirements on the thermal expansion performance of the fine metal mask material in the evaporation process, the mask (Mask Sheet) of the fine metal mask generally uses Invar as the raw material. At present, the PPI of mainstream OLED screen mobile phones is between 400-500, and some high-end mobile phone OLED screens can reach 550PPI. The traditional fine metal mask mask production adopts the etching method, but the etching method is more difficult to produce high pi...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the existing high-PPI fine metal mask plate, such as thin mask, difficult manufacture, low success rate, high cost of raw materials, equipment cost, and high production input cost, the simple low-PPI mask product is stretched first, and then Smaller high PPI openings are formed after coating PI and exposure and development to achieve high PPI mask sheet stretching

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