Touch screen, fabrication method thereof, and display apparatus

A touch screen, comprising a pixel region disposed over a base substrate, wherein:

• the pixel region is surrounded by a first barrier, configured to insulate the pixel region;
• and
• the pixel region comprises:
• a first electrode;
• a light-emitting layer, disposed over the first electrode;
• and
• a second electrode, disposed over the light-emitting layer;
• wherein:
• the second electrode expands over an opening of the first barrier so as to be able to electrically connect with a third electrode outside the pixel region;
• the first barrier comprises a first portion and a second portion;
• a first height of the first portion is greater than or equal to a sum of thicknesses of the first electrode, the light-emitting layer, and the second electrode;
• a second height of the second portion is greater than or equal to a sum of thicknesses of the first electrode and the light-emitting layer, but lower than the sum of thicknesses of the first electrode, the light-emitting layer, and the second electrode;
• and
• the opening is arranged on the second portion.