Method of manufacturing pixel structure of liquid crystal display panel

A method of manufacturing a pixel structure of a liquid crystal display panel, comprising following steps:

• providing a substrate;
• forming a switch device and a pixel electrode on the substrate, wherein the switch device is electrically connected to the pixel electrode;
• forming an insulating layer on the substrate, wherein the insulating layer covers the switch device and the pixel electrode;
• forming a common electrode layer on the insulating layer;
• forming a patterned photoresist layer on the common electrode layer, wherein the patterned photoresist layer comprises a plurality of discontinuous patterns;
• performing a first etching process to remove a portion of the common electrode layer by taking the patterned photoresist layer as an etching mask so as to form a patterned common electrode;
• performing a second etching process to remove part of a surface of the insulating layer by taking the patterned photoresist layer as an etching mask so as to form a plurality of trenches in the insulating layer, wherein the patterned common electrode does not cover the plurality of trenches;
• and
• removing the patterned photoresist layer.