Display substrate, display panel, display apparatus, and method of fabricating display substrate

A method of fabricating a display substrate having a display area and a gate-on-array (GOA) area outside the display area, comprising:

• forming a light shielding layer on a base substrate;
• forming an insulating layer on a side of the light shielding layer away from the base substrate;
• forming a GOA signal line on a side of the insulating layer away from the light shielding layer, the GOA signal line formed to be connected electrically in parallel with a first part of the light shielding layer, the first part being in the GOA area;
• forming a plurality of first vias extending through the insulating layer in the GOA area;
• forming a plurality of thin film transistors in the display area;
• forming a planarization layer on a side of the GOA signal line away from the base substrate;
• forming a first signal line in the GOA area and on a side of the planarization layer away from the base substrate, the first signal line formed to be connected electrically in parallel with a second part of the light shielding layer in the GOA area, the second part spaced apart from the first part;
• forming a plurality of second vias extending through the insulating layer and the planarization layer in the GOA area;
• forming a second signal line in the display area and on a side of the planarization layer away from the base substrate, the second signal line formed to be connected electrically in parallel with a third part of the light shielding layer in the display area, the third part spaced apart from the first part and spaced apart from the second part;
• and
• forming a plurality of third vias extending through the insulating layer and the planarization layer in the display area;
• wherein the GOA signal line is electrically connected to the first part of the light shielding layer through the plurality of first vias respectively, thereby connecting the GOA signal line and the first part of the light shielding layer electrically in parallel;
• forming the light shielding layer further comprises forming a plurality of light shielding blocks on the base substrate and in the display area, a respective one of the plurality of light shielding blocks formed on a side of an active layer of the plurality of thin film transistors closer to the base substrate for shielding light from irradiating on the active layer;
• the first part of the light shielding layer and the plurality of light shielding blocks are formed in a same layer using a same material and a single mask plate;
• the first signal line is formed to be electrically connected to the second part of the light shielding layer through the plurality of second vias respectively, thereby connecting the first signal line and the second part of the light shielding layer electrically in parallel;
• and
• the second signal line is formed to be electrically connected to the third part of the light shielding layer through the plurality of third vias respectively, thereby connecting the second signal line and the third part of the light shielding layer electrically in parallel.