Patent ID: 8178374
Filing Date: 2012-05-15
Classification: H01L

Abstract:
1. A method for manufacturing a liquid crystal display device comprising step 1 of depositing a common electrode transparent conductive layer on a substrate, and applying a photoresist layer on the common electrode transparent conductive layer; step 2 of exposing and developing the photoresist layer using a dual tone mask to define a first region, a second region and a third region, wherein the photoresist layer in the first region is thicker than the photoresist layer in the second region and there is no photoresist layer left in the third region; step 3 of over-etching the common electrode transparent conductive layer to remove the common electrode transparent conductive layer in the third region and form an over-etched region in the peripheral region of the first region; step 4 of removing a part of the photoresist layer by ashing to expose the common electrode transparent conductive layer in the second region; step 5 of depositing a gate metal layer so that the common electrode transparent conductive layer contacts the gate metal layer in the second region; step 6 of lifting off the photoresist layer to remove the gate metal layer in the first region and exposing the substrate in the over-etched region of the first region, thereby forming gate lines, common electrode lines, and common electrodes contacting the common electrode lines; step 7 of forming thin film transistors comprising a source/drain electrode metal layer on the substrate; and step 8 of forming pixel electrodes on the substrate.