Display substrate comprising a data line arranged at a same layer as a gate electrode, method for manufacturing the same, and display device

A display device, comprising a display substrate, wherein the display substrate comprises:

• a base substrate;
• a thin film transistor located on the base substrate, the thin film transistor comprising a source electrode, a drain electrode, an active layer located at a side of the source electrode and the drain electrode away from the base substrate, and a gate electrode located at a side of the active layer away from the base substrate, and a thickness of the source electrode and a thickness of the drain electrode being less than a predetermined threshold;
• a protection layer located at a side of the thin film transistor away from the base substrate, the protection layer comprising a first via hole and a second via hole, and a conductive connection pattern being arranged in the first via hole;
• a data line arranged at a same layer and made of a same material as the gate electrode, the data line being coupled to the source electrode of the thin film transistor through the conductive connection pattern in the first via hole of the protection layer;
• and
• a pixel electrode directly connected to the drain electrode and lapped onto the drain electrode, wherein the pixel electrode is arranged at a same layer as the drain electrode;
• wherein the first via hole and the second via hole are mutually independent structures not in direct electrical contact with each other;
• wherein the display substrate further comprises a gate line located at a side of the protection layer away from the base substrate and coupled to the gate electrode though the second via hole penetrating through the protection layer;
• wherein the second via hole is filled with a conductive connection structure through which the gate line is coupled to the gate electrode, and the conductive connection structure is made of a same material as a common electrode of the display substrate;
• wherein the conductive connection pattern comprises a first conductive connection pattern and a second conductive connection pattern laminated one on another, the first conductive connection pattern is made of a same material as the common electrode, and the second conductive connection pattern is made of a same material as the gate line.

A method for manufacturing a display substrate, comprising:

• providing a base substrate;
• forming a thin film transistor on the base substrate, the thin film transistor comprising a source electrode, a drain electrode, an active layer located at a side of the source electrode and the drain electrode away from the base substrate, and a gate electrode located at a side of the active layer away from the base substrate, and a thickness of the source electrode and a thickness of the drain electrode being less than a predetermined threshold;
• forming a protection layer at a side of the thin film transistor away from the base substrate, the protection layer comprising a first via hole and a second via hole, and a conductive connection pattern being arranged in the first via hole;
• forming a data line arranged at a same layer and made of a same material as the gate electrode, the data line being coupled to the source electrode of the thin film transistor through the conductive connection pattern in the first via hole of the protection layer;
• and
• forming a pixel electrode directly connected to the drain electrode and lapped onto the drain electrode, wherein the pixel electrode is arranged at a same layer as the drain electrode;
• wherein the first via hole and the second via hole are mutually independent structures not in direct electrical contact with each other;
• wherein the method further comprises:
• forming a common electrode at a side of the protection layer away from the base substrate, forming a conductive connection structure in the second via hole while forming the common electrode, forming a first conductive connection pattern in the first via hole the gate line being coupled to the gate electrode though the second via hole penetrating through the protection layer, and forming a gate line and a second conductive connection pattern at a side of the protection layer away from the common electrode, the gate line being coupled to the gate electrode through the conductive connection structure, the conductive connection structure being made of a same material as the common electrode of the display substrate, the first conductive connection pattern being made of a same material as the common electrode, and the second conductive connection pattern being made of a same material as the gate line.