Metal shade

Abstract

The invention discloses a metal mask. The metal mask comprises a main pattern area; the edge pattern area is located on the side edge of the main pattern area, the upper surface and the lower surface of the edge pattern area are each provided with a plurality of concave grooves used for reducing the length difference caused by stress release in the calendaring process, and the length difference caused by stress release in the calendaring process is reduced through the concave grooves in the upper surface and the lower surface of the edge pattern area; and unevenness of wave fluctuation at the edge part of the metal shade is prevented.

Description

technical field [0001] The invention relates to the technical field of display screen evaporation, in particular to a metal mask. Background technique [0002] Fine metal mask (FMM, fine metal mask) is mainly used in the OLED evaporation process. The evaporation materials of RGB three colors pass through the holes on the fine metal mask to accurately define the position, shape and size on the glass substrate. The metal sheet carrying the precision metal mask is formed through a cold rolling process, such as figure 1 As shown, the metal sheet is rolled from a thick material into a thin material by upper and lower rollers, forming tensile stress (F1, F3) on the upper and lower surface layers of the metal material, and compressive stress (F2) on the middle layer. In the steady state without etching holes In the case of , F2=F1+F3. [0003] When the thin metal plate is processed into a precision metal mask, the pattern area of ​​the precision metal mask will shrink after etchi...

AI Technical Summary

Problems solved by technology

However, the grooves in this solution are through holes, which lead to unnecessary pixels on the substrate during evaporation. Another problem is that the grooves are arranged at intervals, and the stress in the auxiliary area between the grooves is not uniform.

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