Patent ID: 7892897

Claim:
A method for manufacturing a TFT-LCD pixel unit, comprising: a) step 1 using a first gray tone mask, comprising: i) sequentially depositing a gate metal layer, a first gate insulating layer, an active layer, and a doped layer on a substrate; ii) exposing and developing a photoresist layer with the first gray tone mask to obtain a first photoresist pattern including a first photoresist-free region, a first photoresist partially retained region, and a first photoresist fully retained region; iii) etching the first photoresist-free region to form the patterns of a gate line and a gate electrode formed by the gate metal layer; iv) performing an ashing process on the first photoresist pattern to remove the photoresist in the first photoresist partially retained region entirely and reduce a thickness of the photoresist in the first photoresist fully retained region, such that a part of the doped layer on the gate line are exposed; v) etching the exposed doped layer and the active layer to obtain an intercepting trench on the gate line; vi) depositing a second insulating layer; and vii) performing a photoresist lift-off process to lift off the second insulating layer above the gate electrode and the gate line except the intercepting trench, b) step 2 using a second gray tone mask, comprising: i) depositing a first metal layer on the substrate, ii) exposing and developing a photoresist layer with the second gray tone mask to obtain a second photoresist pattern including a second photoresist-free region, a second photoresist partially retained region, and a second photoresist fully retained region; iii) etching the second photoresist-free region by photolithography process to form a TFT channel, so that a data line and a first source/drain electrode are integrally formed by the first metal layer.