Display substrate and manufacturing method thereof and display panel
The display substrate of the present disclosure includes: a substrate having a display side and a back side opposite to each other; a display structure on the display side of the substrate, the display structure including a positive voltage interface for supplying a positive voltage and a plurality of pixel circuits, each pixel circuit including a plurality of transistors; a shielding structure between the substrate and the display structure, the shielding structure being made of a conductive material and electrically coupled to the positive voltage interface; wherein an orthographic projection of active regions of at least a portion of the transistors on the substrate coincides with an orthographic projection of the shielding structure on the substrate; and an insulating isolation layer between the shielding structure and the display structure.
1 . A display substrate, comprising:
a substrate having a display side and a back side opposite to each other;
a display structure on the display side of the substrate, the display structure comprising a positive voltage interface configured to supply a positive voltage and a plurality of pixel circuits, each pixel circuit comprising a plurality of transistors;
a shielding structure between the substrate and the display structure, the shielding structure being made of a conductive material and electrically coupled to the positive voltage interface; and
an insulating isolation layer between the shielding structure and the display structure,
wherein each pixel circuit comprises:
a storage capacitor having a first electrode coupled to a positive voltage signal terminal, which is electrically coupled to the positive voltage interface;
a first transistor having a gate electrode coupled to a reset signal terminal, a first electrode coupled to a second electrode of the storage capacitor, and a second electrode coupled to an initialization signal terminal;
a second transistor having a gate electrode coupled to a gate signal terminal and a first electrode coupled to the second electrode of the storage capacitor;
a third transistor having a gate electrode coupled to the second electrode of the storage capacitor and a second electrode coupled to a second electrode of the second transistor;
a fourth transistor having a gate electrode coupled to the gate signal terminal, a first electrode coupled to a first electrode of the third transistor, and a second electrode coupled to a data signal terminal;
a fifth transistor having a gate electrode coupled to a control signal terminal, a first electrode coupled to the positive voltage signal terminal, and a second electrode coupled to a first electrode of the third transistor;
a sixth transistor having a gate electrode coupled to the control signal terminal and a first electrode coupled to the second electrode of the second transistor;
a seventh transistor having a gate electrode coupled to the gate signal terminal, a first electrode coupled to a second electrode of the sixth transistor, and a second electrode coupled to the initialization signal terminal; and
a light emitting device having a first electrode coupled to the second electrode of the sixth transistor, and a second electrode coupled to a negative voltage signal terminal,
wherein orthographic projections of active regions of only the second transistor and the fourth transistor on the substrate coincide with the orthographic projection of the shielding structure on the substrate.
2 . The display substrate of claim 1 , wherein the shielding structure comprises a plurality of connection portions, and a plurality of shielding portions;
each shielding portion corresponds to an active region of a respective one of the second transistor and the fourth transistor, and the orthographic projection of the active region of each of the second transistor and the fourth transistor on the substrate coincides with the orthographic projection of shielding portion corresponding thereto on the substrate; and
each shield portion is electrically coupled to the positive voltage interface through the connection portion.
3 . The display substrate of claim 2 , wherein the display structure further comprises:
a plurality of positive voltage signal lines extending in a first direction, each positive voltage signal line coupling a plurality of pixel circuits arranged in a line in the first direction and being electrically coupled to the positive voltage interface; and
each shield portion is electrically coupled to the positive voltage signal line through the connection portion.
4 . The display substrate of claim 3 , wherein the plurality of connection portions comprise a plurality of first connection portions, and a plurality of second connection portions extending in the first direction;
the shield portions corresponding to the transistors in the plurality of pixel circuits arranged in a line in the first direction are coupled to a same second connection portion through the first connection portions, respectively; and
at one end of the display substrate in the first direction, each of the second connection portions is coupled to a respective one of the plurality of positive voltage signal lines through a via in the insulating isolation layer.
5 . The display substrate of claim 4 , wherein the connection portion further comprises a of third connection portion; and
in at least a portion of adjacent pixel circuits arranged in a direction perpendicular to the first direction, at least some shield portions corresponding to the transistors in different pixel circuits are coupled to each other through the third connection portion.
6 . The display substrate of claim 3 , wherein the connection portion further comprises a fourth connection portion; and
the shield portions corresponding to the second transistor and the fourth transistor of each pixel circuit are coupled to the fourth connection portion, which is coupled to the positive voltage signal line in the pixel circuit through a via in the insulating isolation layer.
7 . The display substrate of claim 1 , wherein the display structure further comprises:
a gate insulating layer on a side of the active region of each transistor away from the substrate; and
a first gate layer on a side of the gate insulating layer away from the substrate, wherein a gate electrode of the transistor is in the first gate layer.
8 . The display substrate of claim 7 , wherein the transistor is a P-type transistor.
9 . The display substrate of claim 7 , wherein the display structure further comprises:
a first interlayer insulating layer on a side of the first gate layer away from the substrate;
a second gate layer on a side of the first interlayer insulating layer away from the substrate;
a second interlayer insulating layer on a side of the second gate layer away from the substrate;
a source-drain layer on a side of the second interlayer insulating layer away from the substrate;
a planarization layer on a side of the source-drain layer away from the substrate; and
a light emitting device on a side of the planarization layer away from the substrate.
10 . A display panel, comprising:
the display substrate of claim 1 ;
a cover glass on the display side of the substrate of the display substrate; and
a metal heat dissipation layer on the back side of the substrate of the display substrate.
11 . A method of manufacturing a display substrate, wherein the display substrate is the display substrate of claim 1 , and the method comprises:
sequentially forming the shielding structure, the insulating isolation layer and the display structure on the display side of the substrate.
12 . A display panel, comprising:
the display substrate of claim 2 ;
a cover glass on the display side of the substrate of the display substrate; and
a metal heat dissipation layer on the back side of the substrate of the display substrate.
13 . A display panel, comprising:
the display substrate of claim 3 ;
a cover glass on the display side of the substrate of the display substrate; and
a metal heat dissipation layer on the back side of the substrate of the display substrate.
14 . A display panel, comprising:
the display substrate of claim 4 ;
a cover glass on the display side of the substrate of the display substrate; and
a metal heat dissipation layer on the back side of the substrate of the display substrate.
15 . A display panel, comprising:
the display substrate of claim 5 ;
a cover glass on the display side of the substrate of the display substrate; and
a metal heat dissipation layer on the back side of the substrate of the display substrate.
16 . A display panel, comprising:
the display substrate of claim 6 ;
a cover glass on the display side of the substrate of the display substrate; and
a metal heat dissipation layer on the back side of the substrate of the display substrate.