Patent ID: 9423541
Filing Date: 2016-08-23
CPC Classification: G02B,G02F

Claim Text:
1. A method of manufacturing a mother substrate assembly, comprising: forming a metal layer on substantially an entire surface of a transparent substrate including a cell area including a non-display area and a display area, an align key area, and a substrate area surrounding the cell area and the align key area; forming an etch stop layer on substantially an entire surface of the metal layer; forming a photoresist layer on substantially an entire surface of the etch stop layer; exposing the photoresist layer to a light using a first mask, the photoresist layer being fully exposed in the substrate area and under-exposed in the display area and the light being blocked in the non-display area and the align key area; developing the photoresist layer to form a main photoresist layer and a sub-photoresist layer, which have different heights from each other, and to expose an upper surface of the etch stop layer in the substrate area; removing the etch stop layer and the metal layer in the substrate area to form an align key in the align key area; removing the sub-photoresist layer to expose an upper surface of the etch stop layer in the display area; removing the etch stop layer in the display area; removing the main photoresist layer from the non-display area and the align key area; and etching the metal layer in the display area to form a metal nano-wire.