Mask frame

Abstract

The embodiment of the invention relates to the technical field of display, and discloses a mask frame. The mask frame comprises a frame body and at least one composite supporting strip, wherein the frame body comprises an evaporation area and frame arms located on the periphery of the evaporation area; the two ends of the composite supporting strip are fixed to the two mutually parallel frame arms separately, and each composite supporting strip comprises a magnetic supporting strip body and a non-magnetic supporting strip body located at the side, away from the corresponding frame arm, of the magnetic supporting strip body; and the orthographic projection of each non-magnetic supporting strip on a plane parallel to the evaporation area completely covers the orthographic projection of the corresponding magnetic supporting strip on the plane parallel to the evaporation area. By means of the mask frame in the embodiment, the evaporation yield can be increased to a great extent.

Description

technical field [0001] The embodiments of the present invention relate to the field of display technology, in particular to a mask frame. Background technique [0002] Due to its self-luminous organic electroluminescent diodes, high contrast, thin thickness, fast response, and bendability, OLED display screens are considered to be the next generation of emerging application technologies for flat-panel displays. [0003] In the evaporation process section of the OLED process, a fine metal mask (FMM) is mainly used to control the deposition of organic materials on the substrate to complete the evaporation of each film layer. The precision mask plate includes a frame body, a support bar and a mask bar, and the support bar plays a role of shielding and supporting, and is welded on the frame body. [0004] However, the inventor found that when the material of the support bar is non-magnetic, it is easy to sag under the action of gravity after welding, and the evaporation substra...

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Problems solved by technology

[0004] However, the inventor found that when the material of the support bar is non-magnetic, it is easy to sag under the action of gravity after welding, and the evaporation substrate cannot be completely attached to the mask bar, resulting in poor evaporation, especially in large-scale projects; When the material of the support bar is a magnetic material, the uneven distribution of the magnetic field can easily lead to the problem of the magnetic support bar rolling over, which also leads to the problem of poor evaporation.

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