Array substrate, manufacturing method thereof, liquid crystal cell and display apparatus

An array substrate, comprising:

• a first base substrate;
• a plurality of thin film transistors on one side of the first base substrate;
• a first planarization layer on a side of the plurality of thin film transistors away from the first base substrate;
• a common electrode on a side of the first planarization layer away from the plurality of thin film transistors;
• a first dielectric layer on a side of the common electrode away from the first planarization layer;
• a plurality of first pixel electrodes on a side of the first dielectric layer away from the common electrode;
• wherein the plurality of first pixel electrodes are electrically connected to the plurality of thin film transistors in a one-to-one correspondence through first vias extending through the first dielectric layer and the first planarization layer;
• a surface of each first pixel electrode away from the first base substrate is provided with a first groove at least corresponding to a first via;
• and
• a plurality of flat portions on a side of the first groove away from the first base substrate;
• wherein a distance from a surface of each flat portion away from the first base substrate to the first base substrate is substantially the same as a distance from the surface of each first pixel electrode away from the first base substrate to the first base substrate.