Organic light emitting display device and repair method thereof

• US 10,461,283 B2
• Filed: 03/08/2019
• Issued: 10/29/2019
• Est. Priority Date: 12/29/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, YoonJu, Kim, JeongHwan, Choi, SooHong, Shin, HongJae, Park, KwangMo, Song, JaYeon
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): Elnafia, Saifeldin E
• Application Number:
  US16/297,223
• Publication Number:
  US 20190206300A1
• Time in Patent Office: 235 Days
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2330/08 Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
• CPC Class Codes: G09G 2330/10 Dealing with defective pixels
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3283 in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/861 Repairing

Abstract

By forming a repair structure in a horizontal direction and vertical direction by using one or more repair lines between two or more pixels adjacent to each other in a display panel, even though a dark spot appears due to a defective operation of one pixel, the one pixel may be compensated to be driven by using the other pixel.

Claims

1. A repair method of an organic light emitting display device including a plurality of pixels, each pixel among the plurality of pixels including an organic light emitting diode (OLED) in every pixel area defined as a plurality of scan lines and a plurality of data lines intersecting with each other, and the organic light emitting display device further including a repair structure in a horizontal direction by one or more repair lines between two or more adjacent pixels among the plurality of pixels, the repair method comprising:

cutting a connection between a driving thin-film transistor (TFT) defective in operation and an anode electrode of an OLED of a first pixel among the two or more adjacent pixels;

repairing a source electrode of an in-defective driving TFT of a second pixel and the anode electrode of the OLED of the first pixel by welding the repair line and the source electrode of the driving TFT of the second pixel adjacent to the first pixel; and

operating the OLED of the first pixel through the in-defective driving TFT of the second pixel,

wherein the repair line extends from the end of the anode electrode of the OLED of the first pixel to overlap the source electrode of the driving TFT of the second pixel, and

wherein the repairing includes welding the repair line and the source electrode of the driving TFT of the second pixel to connect the repair line and the source electrode of the driving TFT of the second pixel.

2. The repair method of claim 1, wherein the repair line overlaps the driving TFT of the first pixel and the driving TFT of the second pixel below the anode electrodes of the OLEDs of the first pixel and the second pixel, and

the repairing comprises:

welding the anode electrode of the OLED of the first pixel and the repair line to connect the anode electrode of the OLED of the first pixel and the repair line; and

welding the repair line and the source electrode of the driving TFT of the second pixel to connect the repair line and the source electrode of the driving TFT of the second pixel.

3. The repair method of claim 1, wherein the operating of the OLED of the first pixel comprises adjusting a magnitude of a data voltage applied to the second pixel.