Sapphire mobile phone panel processing method

Abstract

The invention discloses a sapphire mobile phone panel processing method. The process consists of material preparation, cutting, chamfering, rough grinding, annealing, DMP, CMP (chemical mechanical polishing), cleaning, coating, screen printing and finished product inspection, wherein in the step 1 of cutting, a crystal block is sliced to facilitate follow-up processing; in the step 2 of chamfering, the wafer edge is trimmed into an arc shape to improve the mechanical strength of the sheet edge and avoid stress concentration and consequent defect; in the step 3 of rough grinding, a wafer cutting damage layer caused by slicing is removed, and the flatness of the wafer is improved; in the step 4 of annealing, the stress concentration and large BOW caused by mechanical processing are improved; in the step 5 of DMP, the damage layer caused by rough grinding is improved, and the surface roughness of the wafer is reduced; in the step 6 of CMP, the wafer roughness is improved so that the surface reaches the nanoscale precision; in the step 7 of coating, the wafer is subjected to anti-fingerprint coating treatment; and in the step 8 of screen printing, the single side of the wafer is subjected to screen printing treatment to enhance light absorption. By adopting the method, a sapphire mobile phone panel without damage layer on surface and with nanoscale roughness can be obtained; moreover, the preparation period is greatly shortened, the production cost is saved, and the labor productivity is improved.

Description

technical field [0001] The invention relates to a method for processing a mobile phone panel made of sapphire material, which belongs to the technical field of mobile phone materials. Background technique [0002] Sapphire, also known as white gemstone, is a man-made single crystal material with a molecular formula of Al2O3 and a hexagonal crystal structure. High-quality optical functional material with extremely high hardness (Modi hardness: 9.2~9.4), high temperature resistance, wear resistance, corrosion resistance and wide light transmission band (spectral range: 0.3~6μm). It has a unique combination of excellent optical properties, physical properties and chemical properties. As the hardest (single crystal purity ≥ 99.99%, hardness 9mohs) oxide crystal, sapphire is used in various demanding fields due to its optical and physical properties. Sapphire can maintain its high strength, excellent thermal properties and transmittance at high temperatures. It has very good t...

AI Technical Summary

Problems solved by technology

Research shows that sapphire mobile phone panels can be processed efficiently and cost-effectively