Patent ID: 11877476
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 8:
9. A method for preparing a display substrate, comprising:
forming a microcavity structure layer, a reflective electrode being formed in the microcavity structure layer, and a groove being formed on a surface of the microcavity structure layer; and
forming a light emitting structure layer on the microcavity structure layer, a first electrode of the light emitting structure layer being formed in the groove and being connected to the reflective electrode;
wherein before the forming a microcavity structure layer, the preparation method further comprises:
forming a driving circuit layer on a silicon-based substrate, the driving circuit layer comprising a driving transistor, and a first via exposing a drain electrode of the driving transistor being formed on the driving circuit layer;
wherein the forming a microcavity structure layer comprises:
forming a connection electrode on the driving circuit layer, the connection electrode being connected to the drain electrode of the driving transistor through the first via; forming a first insulating layer covering the connection electrode, a second via exposing the connection electrode being formed on the first insulating layer;
forming a reflective electrode on the first insulating layer, the reflective electrode being connected to the connection electrode through the second via; and
forming a second insulating layer covering the reflective electrode, the groove being formed on a surface of the second insulating layer away from the silicon-based substrate, and a third via exposing the reflective electrode being formed in the groove, wherein the groove is communicated with the reflective electrode through the third via and separated from the drain electrode by the third via hole, the third insulating layer, the reflective electrode, the first insulating layer, and the connection electrode, the first electrode is disposed in the groove of the second insulating layer to control a height difference between the first electrode and the second insulating layer, a width of the groove is greater than a width of the first electrode, and a height of the groove is less than a height of the first electrode.