Shadow mask and manufacturing method thereof
AssigneeLG Display Co., Ltd.
InventorsSoon Sung Yoo, Oh Nam Kwon
Life of this patent
Estimating the term…
Abstract
Disclosed is a shadow mask having a fine slit that can improve precision and resolution of a pattern by reducing side etching during an etching process of a mask substrate, and a manufacturing method thereof. The shadow mask includes a mask substrate, a slit region formed by penetrating through the mask substrate, the slit region having a plurality of undercut portions at respective sides thereof, each undercut portion having a unit thickness, and a shadow region provided in the mask substrate, the shadow region corresponding to a region other than the slit region.
Claims18
A shadow mask, comprising:
- a mask substrate;
- a slit region formed by a first etching through the mask substrate using an etching mask, the slit region including etched side walls having a plurality of undercut portions, each undercut portion having a predetermined unit thickness so that the undercut portions have substantially the same thickness with each other;
- and
- a shadow region provided in the mask substrate, the shadow region corresponding to a region other than the slit region,
- wherein the slit region is further etched by a second etching performed after only regions under the etching mask are filled with photoresist, and
- wherein the predetermined unit thickness of each of the undercut portions is about 2 to 15 micrometers.
A method of manufacturing a shadow mask, comprising:
- forming a predetermined metal pattern on a mask substrate;
- partially etching the mask substrate by a predetermined unit thickness using the predetermined metal pattern as an etching mask;
- filling undercut portions formed during the step of partially etching the mask substrate with photoresist;
- partially etching the partially etched portion of the mask substrate using the predetermined metal pattern as an etching mask after only regions under the etching mask are filled with the photoresist;
- and
- repeating the steps of filling undercut portions formed during the step of partially etching the mask substrate with photoresist and partially etching the partially etched portion of the mask substrate using the predetermined metal pattern as an etching mask by a predetermined number of times until a slit region is completely formed so that the undercut portions have substantially the same thickness with each other,
- wherein the predetermined unit thickness of the undercut portion is 2 to 15 micrometers.
A method of manufacturing a shadow mask, comprising:
- forming a metal pattern in a shadow region on a metal mask including the shadow region and a slit region;
- etching the metal mask in the slit region by a predetermined unit thickness using the metal pattern as an etching mask so that undercut portion are defined in the metal mask under edge portions of the metal pattern;
- coating the entire surface of the metal mask with the metal pattern thereon with photoresist such that photoresist is deposited in the undercut portions;
- exposing the photoresist such that the photoresist in the undercut portions is shielded by the metal pattern;
- developing the photoresist on the metal mask, thereby maintaining the photoresist in the undercut portions;
- forming a slit penetrating through the metal mask in the slit region by repeating the steps of etching the metal mask in the slit region by the predetermined unit thickness, coating the surface of the metal mask with photoresist, and filling undercut portions at respective sides of the slit region with the photoresist by a predetermined number of times so that the undercut portions have substantially the same thickness with each other;
- and
- removing the metal pattern by etching,
- wherein the size of the undercut portion is about 2 to 15 micrometers.
Dependencies are inferred from the claim text.