Liquid crystal display device having a contact hole having an undercut shape

摘要

An array substrate for a liquid crystal display (LCD) device include: a substrate; a gate line formed in one direction on one surface of the substrate; a data line crossing the gate line to define a pixel area; a thin film transistor (TFT) configured at a crossing of the gate line and the data line; a pixel electrode formed at a pixel region of the substrate; an insulating film formed on the entire surface of the substrate including the pixel electrode and the TFT, including a first insulating film formed of a high temperature silicon nitride film and a second insulating film formed of a low temperature silicon nitride film, and having a contact hole having an undercut shape exposing the pixel electrode; a pixel electrode connection pattern formed within the contact hole having an undercut shape and connected with the pixel electrode and the TFT; and a plurality of common electrodes separately formed on the insulating film.

主权项

1. An array substrate for a liquid crystal display (LCD) device, the substrate comprising:
a substrate; a gate line disposed in one direction on one surface of the substrate; a data line crossing the gate line to define a pixel area; a thin film transistor (TFT) configured at a crossing of the gate line and the data line; a pixel electrode disposed at a pixel region of the substrate; an insulating film on the substrate including the pixel electrode and the TFT, including a first insulating film comprising a first material and a second insulating film disposed above the first insulating film and comprising a second material different from the first material, and having a contact hole having an undercut shape exposing the pixel electrode, wherein a width of the contact hole adjacent to the interface between the first and second insulating films is greater than a width of the contact hole adjacent to an upper surface of the second insulating film and a width of the contact hole adjacent to a lower surface of the first insulating film; a pixel electrode connection pattern disposed within the contact hole below the interface between the first and the second insulating films and connected with the pixel electrode and the TFT; and a plurality of common electrodes separately disposed on the insulating film.