Display substrate and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-12464868-B2
Application number	US-202117627737-A
Country	US
Kind code	B2
Filing date	Apr 22, 2021
Priority date	May 29, 2020
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

The present disclosure provides a display substrate and a method for manufacturing the display substrate. The display substrate includes a base, a plurality of bonding electrodes disposed on the base and spaced apart from each other, and a plurality of functional devices on a side of the plurality of bonding electrodes away from the base. The plurality of bonding electrodes are coupled to electrodes of the plurality of functional devices by bonding. The display substrate further includes an isolation structure disposed on the base and between at least two adjacent bonding electrodes of the plurality of bonding electrodes.

First claim

What is claimed is:

1 . A display substrate, comprising a base, a plurality of bonding electrodes arranged on the base in a plurality of rows and a plurality of columns and spaced apart from each other, a plurality of functional devices on a side of the plurality of bonding electrodes away from the base, and an isolation structure disposed on the base,
wherein the plurality of bonding electrodes are coupled to positive electrodes and negative electrodes of the plurality of functional devices by bonding, wherein each row of bonding electrodes of the plurality of rows of bonding electrodes comprises a plurality of bonding electrodes arranged in a row direction, the isolation structure comprises a plurality of first isolation patterns extending in the row direction, and the plurality of first isolation patterns and the plurality of rows of bonding electrodes are alternately arranged in a column direction, wherein a width of each first isolation pattern in the column direction is equal to a distance between the positive electrode and the negative electrode adjacent to each other, wherein each functional device further comprises a body, and the positive electrode and the negative electrode protrude from a first surface of the body to an outside of the body, wherein the positive electrode and the negative electrode protrude outward from the first surface of the body by a same thickness, the plurality of rows of bonding electrodes have a same thickness in a vertical direction perpendicular to the row direction and the column direction, and a thickness of the plurality of first isolation patterns in the vertical direction, the thickness of the positive electrode and the negative electrode protruding outward from the first surface of the body, and the thickness of the plurality of rows of bonding electrodes in the vertical direction satisfy: d 1 =(d 2 +d 3 )*[1+ (P/W)], and where d 1 is the thickness of the plurality of first isolation patterns in the vertical direction, d 2 is the thickness of the plurality of rows of bonding electrodes in the vertical direction, d 3 is the thickness of the positive electrode and the negative electrode protruding outward from the first surface of the body, P is a warpage value of a carrier board carrying the plurality of functional devices, and W is a width of the carrier board carrying the plurality of functional devices in the column direction.

2 . The display substrate of claim 1 , wherein
the plurality of rows of bonding electrodes comprises a plurality of rows of first electrodes and a plurality of rows of second electrodes, each row of first electrodes of the plurality of rows of first electrodes comprises a plurality of first electrodes arranged in a row direction, each row of second electrodes of the plurality of rows of second electrodes comprises a plurality of second electrodes arranged in the row direction, and the plurality of rows of first electrodes and the plurality of rows of second electrodes are alternately arranged in a column direction such that each column of bonding electrodes of the plurality of bonding electrodes comprises a plurality of first electrodes and a plurality of second electrodes alternately arranged; and each first electrode is coupled to a corresponding positive electrode by bonding, and each second electrode is coupled to a corresponding negative electrode by bonding.

3 . The display substrate of claim 1 , wherein at least one first isolation pattern is in contact with a row of first electrodes and a row of second electrodes adjacent to the at least one first isolation pattern, and a cross section of at least one first isolation pattern perpendicular to the row direction comprises an inverted trapezium.

4 . The display substrate of claim 3 , wherein
the positive electrode and the negative electrode protrude outward from the first surface of the body by a same thickness; the first electrode and the second electrode have a same thickness in a vertical direction perpendicular to the row direction and the column direction; and the thickness of the positive electrode protruding outward from the first surface of the body is greater than a thickness of the plurality of first isolation patterns in the vertical direction, and the thickness of the plurality of first isolation patterns in the vertical direction is greater than the thickness of the first electrode in the vertical direction.

5 . The display substrate of claim 3 , wherein
a width of the positive electrode in the column direction is equal to a width of the negative electrode in the column direction; a width of the first electrode in the column direction is equal to a width of the second electrode in the column direction; the width of the positive electrode in the column direction is greater than or equal to the width of the first electrode in the column direction; and a distance between surfaces of at least two adjacent first isolation patterns away from the base in the column direction is smaller than the width of the first electrode in the column direction.

6 . The display substrate of claim 3 , wherein a surface of at least one first isolation pattern away from the base and a side surface of the at least one first isolation pattern adjacent to the surface of the at least one first isolation pattern away from the base form a chamfer, and the chamfer ranges from 45° to 90°.

7 . The display substrate of claim 1 , wherein a cross section of each first isolation pattern perpendicular to the row direction comprises a rectangle.

8 . The display substrate of claim 7 , wherein the width of each first isolation pattern in the column direction is greater than a distance between the bodies of any two adjacent functional devices in the column direction.

9 . The display substrate of claim 1 , wherein
the isolation structure further comprises a plurality of second isolation patterns disposed on the base and alternately arranged with the plurality of columns of bonding electrodes; the plurality of second isolation patterns extend in the column direction and form a plurality of grooves by crossing the plurality of first isolation patterns, and the plurality of bonding electrodes are respectively located in the plurality of grooves; and the plurality of second isolation patterns have a same shape as the plurality of first isolation patterns.

10 . The display substrate of claim 1 , wherein
each of the plurality of bonding electrodes comprises a first sub-layer and a second sub-layer sequentially stacked on the base, and the second sub-layer is melted when the bonding electrode is bonded; and each of the electrodes of the plurality of functional devices comprises a third sub-layer protruding from a body of the functional device and a fourth sub-layer stacked on the third sub-layer, and the fourth sub-layer is melted when the electrode of the plurality of functional devices is bonded.

11 . The display substrate of claim 10 , wherein
each of the first sub-layer and the third sub-layer comprises one of titanium, copper, nickel, and a metal alloy formed by any two of them; and each of the second sub-layer and the fourth sub-layer comprises one of gold, aluminum, tin, indium, and a metal alloy formed by any two or three of them.

12 . A method for manufacturing a display substrate, comprising:
forming, on a base, a plurality of bonding electrodes spaced apart from each other and arranged in a plurality of rows and a plurality of columns; forming an isolation structure on the base; forming a plurality of functional devices; and coupling positive electrodes and negative electrodes of the plurality of functional devices to the plural

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Technology Dev Co Ltd

Inventors

• Chen Yuju

Classifications

• H10W72/0198

  batch processes · CPC title

• H10W72/072

  of bump connectors · CPC title

• H10W72/241

  Dispositions, e.g. layouts · CPC title

• H10W72/07204

  using temporary auxiliary members, e.g. sacrificial coatings · CPC title

• H10W90/726

  between a chip and a stacked lead frame, conducting package substrate or heat sink · CPC title