Patent ID: 11887899
Assignee: WUHAN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 0:
1. A repairing method for repairing micro-LED chip defective pixel, comprising steps of:
providing a substrate, wherein a plurality of sub-pixel areas are provided on the substrate, each of the sub-pixel areas is provided with two recesses, and the two recesses are respectively a main recess and a backup recess;
transferring a plurality of main micro-LED chips to the substrate by a fluid mass transfer method, so that the main recess in each of the sub-pixel areas is loaded with one of the main micro-LED chips;
detecting all of the main micro-LED chips to find the sub-pixel area with a defective pixel; and
transferring a plurality of backup micro-LED chips to the substrate by a fluid mass transfer method, so that the backup recess in each of the sub-pixel areas where the defective pixel is detected is loaded with one of the backup micro-LED chips, wherein
colors of the light emitted by the backup micro-LED chips and the main Micro-LED chips in the same sub-pixel area are the same, and the color is red, green or blue; wherein
a bottom of each of the main recesses and a bottom of each of the backup recesses are provided with two electrodes, respectively, the two electrodes in the main recess are electrically connected to a first welding circuit, and the two electrodes in the backup recess are electrically connected to a second welding circuit; wherein
the step of “detecting all of the main micro-LED chips to find the sub-pixel area with a defective pixel” includes steps of:
energizing the first welding circuit to bond the two electrodes in each of the main recesses to the loaded main micro-LED chips; and
detecting all of the main micro-LED chips based on an ultraviolet detection method or a micro-LED chip photoelectric characteristic detection method to find out the sub-pixel area with the defective pixel; wherein
after the step of “transferring a plurality of backup micro-LED chips to the substrate by a fluid mass transfer method, so that the backup recess in each of the sub-pixel areas where the defective pixel is detected is loaded with one of the backup micro-LED chips”, the repairing method further comprises a step of:
energizing the second welding circuit, so that the two electrodes in the backup recess in each of the sub-pixel areas where the defective pixel is detected are bonded to the loaded backup micro-LED chips.