US 11574991

US patent 11574991, titled "Organic light emitting diode display with semiconductor layer having bent portion," was granted to Samsung Display Co Ltd. The inventors are Se-Ho Kim, Jin-woo Park, and Won-Se Lee. The patent application was filed on July 22, 2022, and the patent was issued on February 7, 2023.

Abstract:
The patent describes an organic light emitting diode (OLED) display that includes a substrate, a scan line, a data line, a driving voltage line, a switching thin film transistor (TFT), a driving TFT, and an OLED. A key characteristic is that the driving semiconductor layer of the driving TFT is bent and lies in a plane substantially parallel to the substrate.

Plain-language overview of independent claims:

• Independent Claim 1: This claim defines an OLED display structure. It includes a substrate, along with a scan line, a data line, and a driving voltage line for signal and power transfer. The display has a switching thin-film transistor (TFT) connected to the scan and data lines, and a driving TFT connected to the switching TFT. An OLED is coupled to the driving TFT. The central feature is that the driving TFT's semiconductor layer is shaped with bends and is oriented parallel to the substrate.

• Independent Claim 19: This claim also describes an OLED display, building on a similar foundation of a substrate, scan line, initialization voltage line, data line, driving voltage line, switching TFT, driving TFT, and OLED. It additionally specifies a light emission control TFT positioned between the driving TFT and the OLED. A distinctive feature of this claim is the inclusion of a bypass thin-film transistor (TFT) situated between the initialization voltage line and the light emission control TFT. This bypass TFT is designed to divert a portion of the driving current from the driving TFT, controlled by a bypass signal.

Legal Status and Litigation:
The patent 11574991 is currently active and is estimated to expire on July 26, 2033.

According to the patent information, there is litigation associated with this patent family, including:

• A US case filed in the Texas Eastern District Court, identified as case number 2:25-cv-00412.
• A PTAB (Patent Trial and Appeal Board) case, IPR2025-01479, which has been filed and is noted as a settlement.

As of April 26, 2026, no authoritative information on specific CAFC (U.S. Court of Appeals for the Federal Circuit) dockets for 2026 explicitly mentioning patent 11574991 has been found in the provided patent text or search results.