Phenix Longhorn, LLC

Phenix Longhorn, LLC is a Texas-based limited liability company that engages in patent assertion. Public records indicate a registered agent is located in Martindale, Texas. As a private entity, details on its founding date, employee count, and revenue are not publicly available. Industry sources characterize Phenix Longhorn as a non-practicing entity (NPE) and a "funded plaintiff."

The company has no known products or services and its operations are focused on licensing and litigating a portfolio of patents. Its assertion campaign centers on patents related to liquid crystal display (LCD) technology, specifically a "Gamma Reference Voltage Generator." The patents asserted in its lawsuits include U.S. Patent Nos. 7,233,305 and 7,557,788. Bloomberg reports that one of the co-inventors of the patents runs the company.

Consistent with its status as an NPE, Phenix Longhorn's litigation posture is exclusively as a plaintiff. As the case data shows, the company has filed suit but has not been named as a defendant. It has filed its cases in the U.S. District Court for the Eastern District of Texas, a jurisdiction frequently used by patent plaintiffs.

The company's litigation campaign began in October 2023, with lawsuits against major display manufacturers AU Optronics Corporation and Innolux Corporation. Phenix Longhorn later sued other electronics companies, including Hisense and Samsung, over the same patents. In January 2026, a jury in the Eastern District of Texas found that AU Optronics and Hisense did not infringe the patents asserted against them. In a separate matter, court filings show that Phenix Longhorn reached a $3.825 million settlement with Innolux in late 2025.