Mask strip structure of special-shaped screen and preparation method of mask strip structure

Abstract

The invention discloses a special-shaped screen mask strip structure and a preparation method thereof, the special-shaped screen mask strip structure comprises a metal mask strip main body, the surface of the metal mask strip main body is provided with a plurality of groups of etching areas which are distributed at equal intervals, and the etching areas are arranged in a rectangular shape; the etching area comprises an effective area which is circularly arranged and a buffer area which is positioned on the outer side of the effective area and is rectangularly arranged; a plurality of groups of double-sided etching holes formed by adopting a double-sided etching process are uniformly distributed in the effective region, a plurality of groups of single-sided etching holes formed by adopting a single-sided etching process in the back surface of the metal mask strip main body are uniformly distributed in the buffer region, and an unetched layer for preventing an organic material from being evaporated is reserved on the surface of each single-sided etching hole. According to the invention, the structure of the surrounding area of the special-shaped screen is changed, and the buffer area is designed to reduce the phenomenon of non-uniform stress. According to the method, the net stretching yield of the mask strip for the special-shaped screen is improved, the deformation and wrinkle conditions of a special-shaped effective area are reduced, and the color mixing risk is reduced.

Description

technical field [0001] The invention belongs to the technical field of mask strips, and in particular relates to a mask strip structure of a special-shaped screen and a preparation method thereof. Background technique [0002] The OLED display panel has the advantages of thin thickness, low power consumption, bendable and flexible display, and has become the development trend of the next generation panel display in recent years. [0003] Existing OLED panels use an evaporation source to heat and evaporate organic materials in a vacuum environment. The organic materials pass through the openings on the metal mask strips to form an organic film on the surface of the substrate. The film-forming position must be specified on the substrate. The light-emitting position and the current of the substrate can be effectively transmitted to the OLED device to emit light, so the metal mask strip must have high position accuracy and stability, and it must be closely attached to the substr...

AI Technical Summary

Problems solved by technology

When developing special-shaped screens (circle, rhombus, etc.), the effective area of ​​the mask strip needs to be designed as a special shape (circle, rhombus, etc.), and there will be arcs or vertices on both sides of the effective area, that is, the tension at both ends is Different tension effects will be produced when applied, and the force on the edge of the effective area will be uneven, and problems such as effective area deformation, position offset, and wrinkles will easily occur, which directly affects the color mixing yield. This is also one of the difficulties in the development of special-shaped screens.

Images