Patent DE-102004031107-A1 (DE)
Title: Array substrate for in-plane switching liquid crystal display device comprises common electrode with innermost portion being circular band shaped and pixel electrode having innermost pixel electrode pattern of circular shape
Inventor: LEE YUN-BOOK
IPC: G02F1/1368
Filed: 2004-06-28
Abstract: An array substrate for an in-plane switching liquid crystal display (IPS-LCD) device comprises gate line; data line; thin film transistor; common line; common electrode extending from common line and including common electrode patterns; capacitor electrode; pixel connecting line; and pixel electrode within circular opening. An innermost pixel electrode pattern has circular shape. An innermost portion of common electrodes is circular band shaped. An array substrate for an in-plane switching liquid crystal display (IPS-LCD) device comprises gate line (112) on substrate; data line (128) crossing the gate line to define a pixel region having an aperture area; thin film transistor at one corner of the pixel region and connected to the gate line and data line, the thin film transistor including semiconductor layer; common line (114) spaced apart from the gate line and parallel to the gate line; common electrode (120) extending from common line and including common electrode patterns, where an outermost portion of common electrode pattern is rectangle-shaped within the pixel region and has circular opening in the middle; capacitor electrode (140) overlapping the rectangle shaped common electrode pattern, the capacitor electrode connected to the thin film transistor; pixel connecting line parallel to the data line in the pixel region and connected to the capacitor electrode; and pixel electrode (138) within circular opening, extending from the pixel connecting line and including pixel electrode patterns. An innermost pixel electrode pattern has circular shape and other pixel electrodes are patterned to have circular bands. An innermost portion of common electrodes is circular band shaped. The aperture area is circular band shaped. An independent claim is also included for a method of forming an array substrate for IPS-LCD device, comprising forming a gate line having gate electrode, common electrode including common electrode patterns and a common line parallel to and spaced apart from the gate line on a substrate using a first mask process; forming a gate insulating layer on the gate line, the common electrode and the common line; forming a semiconductor layer on the gate insulating layer and over the gate electrode using a second mask process; forming a data line that crosses the gate line to define a pixel region having an aperture area, source electrode extending from the data line, and drain electrode spaced apart from the source electrode using a third mask process, where the source and drain electrodes overlap opposite end portions of the semiconductor layer, the semiconductor layer being exposed between the source and drain electrodes, and the gate electrode, the semiconductor layer, the source electrode and drain electrode forming a thin film transistor; forming a passivation layer over an entire surface of the substrate to cover the thin film transistor and patterning the passivation layer using a fourth mask process to form a drain contact hole to expose a portion of the drain electrode; and forming a capacitor electrode that overlaps the outermost portion of the common electrode pattern and connects to the drain electrode, a pixel connecting line connected to the capacitor electrode, and a pixel electrode extending from the pixel connecting line and including pixel electrode patterns on the passivation layer using a fifth mask process.